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Wed, 17 Jun 2026 08:12:57 -0700 (PDT) From: Mike Lothian To: dri-devel@lists.freedesktop.org Cc: Mike Lothian , rust-for-linux@vger.kernel.org, Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Miguel Ojeda , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , linux-kernel@vger.kernel.org Subject: [RFC PATCH 1/7] drm/vino: add DisplayLink DL3 dock skeleton and plaintext bring-up Date: Wed, 17 Jun 2026 16:12:38 +0100 Message-ID: <20260617151249.2937-2-mike@fireburn.co.uk> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260617151249.2937-1-mike@fireburn.co.uk> References: <20260617151249.2937-1-mike@fireburn.co.uk> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Vino is a clean-room, in-kernel Rust DRM driver for DisplayLink DL3 USB docks (Dell Universal Dock D6000, 17e9:6006), a native replacement for the out-of-tree EVDI module plus the proprietary DisplayLinkManager userspace daemon. It is built on the in-tree Rust USB, crypto and DRM/KMS bindings (posted as their own prerequisite series). This is posted as an [RFC] in a deliberately INCOMPLETE state to ask for help with one remaining blocker (see the final patch of this series for the full "help wanted" note). This first patch is the skeleton. It registers a usb::Driver for the D6000, binds the control interface (interface 0; interface 1 binds idle, the audio/Ethernet interfaces are declined so their class drivers claim them), and runs the plaintext connect handshake on a workqueue: the control-request preamble (device-open vendor reads, SET_INTERFACE, the 0x24/0x22 pair) and the three bulk init messages over the Rust USB bulk + control transfer API, reading the single ACK. The wire framing and the plaintext init message builders live in the new proto module. The HDCP 2.2 AKE, the AES-CTR/AES-CMAC control plane, the Vino codec and the DRM/KMS sink are added in the following patches, one subsystem per patch, so each can be reviewed (and fixed) on its own. Signed-off-by: Mike Lothian Assisted-by: Claude:claude-opus-4-8 [Claude-Code] --- drivers/gpu/drm/Kconfig | 2 + drivers/gpu/drm/Makefile | 2 + drivers/gpu/drm/vino/Kconfig | 21 ++ drivers/gpu/drm/vino/Makefile | 2 + drivers/gpu/drm/vino/proto.rs | 73 +++++++ drivers/gpu/drm/vino/vino.rs | 391 ++++++++++++++++++++++++++++++++++ 6 files changed, 491 insertions(+) create mode 100644 drivers/gpu/drm/vino/Kconfig create mode 100644 drivers/gpu/drm/vino/Makefile create mode 100644 drivers/gpu/drm/vino/proto.rs create mode 100644 drivers/gpu/drm/vino/vino.rs diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 323422861e8f..8ea7f2bb9300 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -370,3 +370,5 @@ endif # Separate option because drm_panel_orientation_quirks.c is shared with fb= dev config DRM_PANEL_ORIENTATION_QUIRKS tristate + +source "drivers/gpu/drm/vino/Kconfig" diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index e97faabcd783..8c6322df7c1f 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -256,3 +256,5 @@ quiet_cmd_hdrtest =3D HDRTEST $(patsubst %.hdrtest,%.h,= $@) =20 $(obj)/%.hdrtest: $(src)/%.h FORCE $(call if_changed_dep,hdrtest) + +obj-$(CONFIG_DRM_VINO) +=3D vino/ diff --git a/drivers/gpu/drm/vino/Kconfig b/drivers/gpu/drm/vino/Kconfig new file mode 100644 index 000000000000..234ce92736e4 --- /dev/null +++ b/drivers/gpu/drm/vino/Kconfig @@ -0,0 +1,21 @@ +# SPDX-License-Identifier: GPL-2.0 +config DRM_VINO + tristate "DisplayLink DL3 (Vino) open driver" + depends on USB =3D y + depends on DRM + depends on RUST + select DRM_KMS_HELPER + select DRM_GEM_SHMEM_HELPER + select RUST_DRM_GEM_SHMEM_HELPER + help + Open in-kernel Rust driver for DisplayLink DL3 USB docks (Dell + Universal Dock D6000 and relatives), reverse-engineered in this tree + (see vino-re/docs/00-canonical-guide.md). + + Phase 0 binds the dock over USB only. USB data transfer, the HDCP 2.2 + control plane, mode-set, the Vino codec and the DRM/KMS sink are added + in later phases (see vino-kmod/README.md). + + To compile this as a module, choose M here: the module is called vino. + + If unsure, say N. diff --git a/drivers/gpu/drm/vino/Makefile b/drivers/gpu/drm/vino/Makefile new file mode 100644 index 000000000000..6e39668040f3 --- /dev/null +++ b/drivers/gpu/drm/vino/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_DRM_VINO) +=3D vino.o diff --git a/drivers/gpu/drm/vino/proto.rs b/drivers/gpu/drm/vino/proto.rs new file mode 100644 index 000000000000..cae6eae46b7a --- /dev/null +++ b/drivers/gpu/drm/vino/proto.rs @@ -0,0 +1,73 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! The DL3 "universal" wire framing and the plaintext session-init messag= es (sec 3/sec 4). + +use super::*; + +/// Append a sec 3-framed message to `out` with an explicit `sub_len_dw`: = a 16-byte +/// little-endian header (`pad(2) | size(2)=3Dtotal-4 | type(4) | sub_id(2= ) | +/// sub_len_dw(2) | seq(4)`) followed by `body`. +/// +/// HDCP OUT messages (sec 5.1) carry DLM-fixed `sub_len_dw` values that a= re *not* +/// `body.len() / 4`, so the framer cannot derive it -- the caller passes = it. +pub(super) fn push_frame_with( + out: &mut KVec, + msg_type: u32, + sub_id: u16, + sub_len_dw: u16, + seq: u32, + body: &[u8], +) -> Result { + let size =3D ((16 + body.len()) - 4) as u16; + out.extend_from_slice(&[0, 0], GFP_KERNEL)?; + out.extend_from_slice(&size.to_le_bytes(), GFP_KERNEL)?; + out.extend_from_slice(&msg_type.to_le_bytes(), GFP_KERNEL)?; + out.extend_from_slice(&sub_id.to_le_bytes(), GFP_KERNEL)?; + out.extend_from_slice(&sub_len_dw.to_le_bytes(), GFP_KERNEL)?; + out.extend_from_slice(&seq.to_le_bytes(), GFP_KERNEL)?; + out.extend_from_slice(body, GFP_KERNEL)?; + Ok(()) +} + +/// `init_25` body (sec 4, verified 2026-05-27). Framed with `sub_len_dw= =3D0` -- the +/// DLM-fixed value, NOT `body.len()/4` (the dock ignores/rejects otherwis= e). +pub(super) const INIT_25: [u8; 16] =3D + [0x05, 0, 0x08, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]; +/// `init_4` (Part A) body (sec 4), also framed with `sub_len_dw=3D0`. +pub(super) const INIT_4: [u8; 16] =3D + [0x04, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]; +/// The first HDCP-channel probe **body** (Part B of the init_4+probe tran= sfer, +/// sec 4): a 32-byte body leading with `14 00 76 00`, the rest zero. It i= s wrapped +/// in its own type=3D4 sub=3D0x04 frame (`sub_len_dw=3D0x0a`) -- see [`in= it_4_probe`]. +/// The dock only ACKs once this framed probe arrives. +pub(super) const PROBE_BODY: [u8; 32] =3D { + let mut p =3D [0u8; 32]; + p[0] =3D 0x14; + p[2] =3D 0x76; + p +}; + +/// `init_0`: 16-byte framing header only, empty body (sec 4). +pub(super) fn init_0() -> Result> { + let mut buf =3D KVec::with_capacity(16, GFP_KERNEL)?; + push_frame_with(&mut buf, 0x01, 0x00, 0, 0, &[])?; + Ok(buf) +} + +/// `init_25`: type=3D2 sub=3D0x25, `sub_len_dw=3D0`, 32 bytes total (sec = 4). +pub(super) fn init_25() -> Result> { + let mut buf =3D KVec::with_capacity(32, GFP_KERNEL)?; + push_frame_with(&mut buf, 0x02, 0x25, 0, 0, &INIT_25)?; + Ok(buf) +} + +/// `init_4` + HDCP probe as one 80-byte transfer (sec 4): Part A (type=3D= 2 sub=3D0x04, +/// `sub_len_dw=3D0`, 32 B) concatenated with Part B -- the probe framed a= s type=3D4 +/// sub=3D0x04 with `sub_len_dw=3D0x0a` over the 32-byte [`PROBE_BODY`] (4= 8 B). This +/// is the message the dock ACKs. +pub(super) fn init_4_probe() -> Result> { + let mut buf =3D KVec::with_capacity(80, GFP_KERNEL)?; + push_frame_with(&mut buf, 0x02, 0x04, 0, 0, &INIT_4)?; // Part A + push_frame_with(&mut buf, 0x04, 0x04, 0x0a, 0, &PROBE_BODY)?; // Part = B (framed probe) + Ok(buf) +} diff --git a/drivers/gpu/drm/vino/vino.rs b/drivers/gpu/drm/vino/vino.rs new file mode 100644 index 000000000000..79f446041b64 --- /dev/null +++ b/drivers/gpu/drm/vino/vino.rs @@ -0,0 +1,391 @@ +// SPDX-License-Identifier: GPL-2.0 +// SPDX-FileCopyrightText: Copyright (C) 2026 Mike Lothian + +//! Vino -- open in-kernel Rust driver for DisplayLink DL3 docks (Dell D60= 00, ...). +//! +//! This is an `[RFC]` work-in-progress, posted to ask for help. It is a c= lean-room +//! reverse-engineered replacement for the proprietary DisplayLinkManager = userspace +//! daemon + the EVDI kernel module, written natively in Rust against the = in-tree USB, +//! crypto and DRM/KMS bindings. +//! +//! This first patch is the skeleton: it binds the dock over USB and runs = the plaintext +//! connect handshake (the control-request preamble and the three bulk ini= t messages over +//! the Rust USB bulk + control transfer API). The HDCP 2.2 AKE, the AES-C= TR/AES-CMAC +//! control plane, the Vino codec and the DRM/KMS sink are added in the fo= llowing patches. +//! +//! Device: VID 0x17e9 (DisplayLink) / PID 0x6006 (Dell Universal Dock D60= 00). + +use kernel::{ + alloc::flags::GFP_KERNEL, + device::{self, Core}, + error::code::ENODEV, + prelude::*, + sync::{aref::ARef, Arc}, + time::Delta, + usb, + workqueue::{self, impl_has_work, new_work, Work, WorkItem}, +}; + +/// DisplayLink vendor id. +const VID_DISPLAYLINK: u16 =3D 0x17e9; +/// Dell Universal Dock D6000 (DL3 family) product id. +const PID_D6000: u16 =3D 0x6006; + +/// Control + per-head bulk endpoints (guide sec 2). +const EP_CTRL_OUT: u8 =3D 0x02; +const EP_CTRL_IN: u8 =3D 0x84; + +/// USB transfer timeout used during bring-up. +fn timeout() -> Delta { + Delta::from_millis(1000) +} + +mod proto; + +/// Per-bound-interface driver state. +struct VinoDriver { + _intf: ARef, +} + +/// Deferred bring-up work item: the bring-up sequence run on the system w= orkqueue instead +/// of inline in `probe()` (which would pin the driver-model probe thread = on blocking USB +/// I/O while the card node is live). Holds a refcounted handle to the bou= nd interface (and, +/// once the DRM sink exists, the DRM device), so they outlive `probe()`. +#[pin_data] +struct BringUp { + intf: ARef, + #[pin] + work: Work, +} + +impl_has_work! { + impl HasWork for BringUp { self.work } +} + +impl BringUp { + fn new(intf: ARef) -> Result> { + Arc::pin_init( + pin_init!(BringUp { + intf, + work <- new_work!("vino::bring_up"), + }), + GFP_KERNEL, + ) + } +} + +impl WorkItem for BringUp { + type Pointer =3D Arc; + + fn run(this: Arc) { + let cdev: &device::Device =3D this.intf.as_ref(); + let dev: &usb::Device =3D this.intf.as_ref(); + // WIP scaffold: attempt the plaintext bring-up. Bind regardless o= f the outcome -- + // there is no display path yet (the HDCP AKE, control plane and D= RM sink land in + // the following patches). + match VinoDriver::bring_up(dev) { + Ok(()) =3D> dev_info!(cdev, "vino: plaintext session init OK\n= "), + Err(e) =3D> dev_info!(cdev, "vino: session init incomplete ({e= :?}) -- WIP\n"), + } + } +} + +impl VinoDriver { + /// Plaintext session bring-up (sec 4): control-request preamble then = the three + /// bulk init messages, reading the single ACK. Best-effort during sca= ffold + /// bring-up -- errors are logged, not fatal. + fn bring_up(dev: &usb::Device) -> Result { + // Control-request preamble (sec 4): dock-id read, interface selec= tion, then the + // vendor_out 0x24 / vendor_in 0x22 pairs that kick off the HDCP p= ath. (The + // GET_DESCRIPTOR string reads DLM also issues look cosmetic and a= re omitted.) + const VENDOR_OUT: u8 =3D 0x40; // host->dev, vendor, device + const VENDOR_IN_IFACE: u8 =3D 0xc1; // dev->host, vendor, INTERFAC= E recipient (DLM's choice) + + // The DLM-style vendor preamble (sec 4). Per the userspace oracle= , every + // control request here is **best-effort**: the dock legitimately = STALLs + // some of them (e.g. the cosmetic dock-id read) yet still advance= s its + // host-identification state. The oracle tolerates each error and = relies + // on DLM's inter-request timing gaps -- without those gaps the do= ck may + // not advance. So we log-and-continue on every control step and i= nsert + // the same delays; only the bulk init + ACK is treated as load-be= aring. + // GROUND-TRUTH 2026-06-13: at device-open DLM issues two vendor-I= N reads on interface 1, + // recipient 0xc1, BEFORE the SET_INTERFACE / 0x24 / 0x22 sequence= (dlm-cold-20260611-123347 + // f708 `0xc1 0xfe wIdx=3D1` -> 16 B "RidgeDock" blob; f710 `0xc1 = 0xfc wIdx=3D1` -> 0 B). vino + // skipped them; the earlier attempt used recipient 0xc0 (device) = and STALLed, which was + // misread as "the dock rejects 0xfe / DLM never sends it". Issue = them here with the correct + // 0xc1 recipient. Best-effort: log and continue (the dock may sti= ll short/stall 0xfc). + let mut dock_id =3D [0u8; 16]; + match dev.control_recv(0xfe, VENDOR_IN_IFACE, 0, 1, &mut dock_id, = timeout()) { + Ok(()) =3D> pr_info!("vino: step device-open 0xfe(iface1) OK = =3D {:02x?}\n", dock_id), + Err(e) =3D> pr_info!("vino: step device-open 0xfe(iface1) non-= fatal ({e:?})\n"), + } + let mut probe3 =3D [0u8; 3]; + match dev.control_recv(0xfc, VENDOR_IN_IFACE, 0, 1, &mut probe3, t= imeout()) { + Ok(()) =3D> pr_info!("vino: step device-open 0xfc(iface1) OK = =3D {:02x?}\n", probe3), + Err(e) =3D> pr_info!("vino: step device-open 0xfc(iface1) non-= fatal ({e:?})\n"), + } + // EXPERIMENT (2026-06-16): replay DLM's repeated STRING-descripto= r reads at device-open. + // Timing analysis of the paired cold capture (captures/paired-col= dbus-20260615-220311) + // shows DLM, beyond the distinct descriptor SET vino already issu= es, re-reads STRING idx0 + // (language-ID list) and idx3 (en-US product, langid 0x0409), 255= B each, at ~2/sec for the + // ENTIRE 175 s session -- a 1 Hz host string-poll heartbeat. Enga= gement happens in the + // first + // second, so this is almost certainly NOT a pre-AKE gate (the dis= tinct set already + // matches), + // but the repetition was never A/B-tested by replay the way the 0= xfe/0xfc reads were. Issue + // a + // small burst here, BEFORE the AKE, to test whether the dock cond= itions CP engagement on + // seeing the host poll its strings. Best-effort: the kernel repor= ts EREMOTEIO on the + // expected + // short reply, but the GET_DESCRIPTOR still reaches the wire, whi= ch is all the experiment + // needs. + // RESULT 2026-06-16 (paired-coldbus-20260616-162650): the pre-arm= GET_DESCRIPTOR delta is + // USB ENUMERATION, not application protocol. Both captures contai= n an identical 3x 8-byte + + // 7x 18-byte DEVICE-descriptor read sequence -- which no kernel d= river issues (it is the + // enumeration handshake the USB core runs each time the dock re-e= numerates on the cold + // plug, plus DisplayLink's leftover /opt/displaylink/udev.sh hook= firing per uevent). + // Proven to be enumeration, not the DLM daemon: the vino capture = reproduces the SAME reads + // with displaylink-driver.service masked and no DisplayLinkManage= r process running. It is + // symmetric across both runs, so it is neither a DLM-vs-vino diff= erence nor the engagement + // gate. This speculative burst only ADDED vino-issued reads on to= p, so disable it. + // -- LIBUSB-STYLE DEVICE-OPEN ENUMERATION (2026-06-17) + // ---------------------------------- + // The clean paired capture (paired-coldbus-20260616-180401) isola= ted the LAST pre-AKE + // divergence from DLM to ONE thing: DLM (libusb) re-reads the doc= k's full descriptor set + // when it opens the device -- DEVICE(18), CONFIG(9 then full ~618= ), STRING langid(idx0), + // then every STRING index the descriptors reference (~22x 255B) -= - right before the AKE. + // A + // kernel driver normally skips this (the USB core cached it at en= umeration), which is why + // vino's pre-arm control stream was missing it (the "DLM-ONLY 255= x22 / 618 / 40" + // residual). + // These reads are CP-irrelevant descriptor boilerplate. The cold-= plug A/B proved the dock + // does NOT gate CP on them (replaying them byte-for-byte still ga= ve 0x wsub=3D0x45 -- see + // project_get_descriptor_burst_experiment / the firmware-wall ver= dict), and the in-kernel + // Windows (WDF) and macOS (IOUSBLib) drivers DON'T issue this bur= st either -- like vino + // they run over an already-enumerated device and use the USB core= 's cached descriptors. + // The burst is therefore a libusb-userspace artifact, not somethi= ng the dock expects. + // Default OFF so vino behaves like a native kernel driver; flip t= o `true` only to reproduce + // DLM's libusb wire for a paired A/B diff. Best-effort throughout= : a STALL/EREMOTEIO on an + // absent index is fine -- EP0 auto-recovers and the SETUP still r= eaches the wire (all the + // A/B diff needs). Reproduces (histogram diff DLM vs vino, paired= -coldbus-20260616-180401): + // DLM's libusb open adds CONFIG-full(618)x3, CONFIG-partial(40)x3= , STRING(255)x22, with + // no + // extra DEVICE(18)/CONFIG(9). + const CP_LIBUSB_OPEN_ENUM: bool =3D false; + if CP_LIBUSB_OPEN_ENUM { + let mut tmp =3D [0u8; 255]; + let mut cfg =3D KVec::from_elem(0u8, 618, GFP_KERNEL)?; + // CONFIG full (618) x3 -- parse the first to find real string= indices so the STRING + // reads + // below return data (matching DLM's byte counts), not just th= e SETUP counts. + for _ in 0..3 { + let _ =3D dev.control_recv(0x06, 0x80, 0x0200, 0, &mut cfg= , timeout()); + } + // CONFIG partial (40) x3. + for _ in 0..3 { + let _ =3D dev.control_recv(0x06, 0x80, 0x0200, 0, &mut tmp= [..40], timeout()); + } + // STRING idx0 =3D language-ID list (1st of the 22x 255 reads)= ; adopt the dock's REAL + // langid. + let mut langid =3D 0x0409u16; + if dev.control_recv(0x06, 0x80, 0x0300, 0, &mut tmp, timeout()= ).is_ok() && tmp[0] >=3D 4 { + langid =3D (tmp[2] as u16) | ((tmp[3] as u16) << 8); + } + // String indices referenced by the config (iConfiguration @of= f6, iInterface @off8). + let mut idxs =3D [0u8; 64]; + let mut ni =3D 0usize; + let mut p =3D 0usize; + while p + 2 <=3D cfg.len() { + let blen =3D cfg[p] as usize; + if blen =3D=3D 0 { + break; + } + let btype =3D cfg[p + 1]; + if btype =3D=3D 0x02 && p + 7 <=3D cfg.len() && cfg[p + 6]= !=3D 0 && ni < idxs.len() { + idxs[ni] =3D cfg[p + 6]; + ni +=3D 1; + } + if btype =3D=3D 0x04 && p + 9 <=3D cfg.len() && cfg[p + 8]= !=3D 0 && ni < idxs.len() { + idxs[ni] =3D cfg[p + 8]; + ni +=3D 1; + } + p +=3D blen; + } + // 21 more STRING(255) reads (idx0 above makes 22 total =3D DL= M's count). Cycle the real + // referenced indices so each returns data; DLM likewise re-re= ads indices. + let mut nok =3D 0usize; + for k in 0..21usize { + let i =3D if ni > 0 { idxs[k % ni] as u16 } else { 1 + k a= s u16 }; + if dev + .control_recv(0x06, 0x80, 0x0300 | i, langid, &mut tmp= , timeout()) + .is_ok() + { + nok +=3D 1; + } + } + pr_info!( + "vino: libusb-open enum: config 618x3 + 40x3, langid=3D{la= ngid:#06x}, strings 22 ({nok} ok of {ni} refs)\n" + ); + } + + // SET_INTERFACE: DLM's two handshake SET_INTERFACEs target iface = 1 (alt 0, + // app-specific/DFU) then iface 0 (alt 0, vendor) -- confirmed by = a clean cold + // DLM usbmon capture (captures/dlm-cold-20260611-123347, t=3D52.0= 79/52.085). + // The old code set iface 4 (the microphone) which DLM NEVER touch= es in the + // handshake (the 58 audio SET_INTERFACEs in a session are snd-usb= -audio's, not + // DLM's -- see project_cp_setinterface_is_audio_binding_fix). + match dev.set_interface(1, 0) { + Ok(()) =3D> pr_info!("vino: step set_interface(1,0) OK\n"), + Err(e) =3D> pr_info!("vino: step set_interface(1,0) non-fatal = ({e:?})\n"), + } + match dev.set_interface(0, 0) { + Ok(()) =3D> pr_info!("vino: step set_interface(0,0) OK\n"), + Err(e) =3D> pr_info!("vino: step set_interface(0,0) non-fatal = ({e:?})\n"), + } + // vendor_out 0x24 (wValue=3D3, initial ack) then vendor_in 0x22 (= state read, + // wValue=3D1 -- DLM's exact values; wValue=3D0 STALLs). Both best= -effort: the + // dock advances state regardless and the oracle tolerates failure= here. + match dev.control_send(0x24, VENDOR_OUT, 3, 0, &[], timeout()) { + Ok(()) =3D> pr_info!("vino: step 0x24(wValue=3D3) OK\n"), + Err(e) =3D> pr_info!("vino: step 0x24(wValue=3D3) non-fatal ({= e:?})\n"), + } + // 0xc1 =3D IN|vendor|INTERFACE recipient (NOT 0xc0, device recipi= ent): DLM's cold capture + // uses + // bmRequestType=3D0xc1, wIndex=3D0 (interface 0). wValue=3D1 (DLM= 's value; 0 stalls). Uses the + // function-scope `VENDOR_IN_IFACE` declared in the device-open pr= eamble above. + let mut state =3D [0u8; 28]; + match dev.control_recv(0x22, VENDOR_IN_IFACE, 1, 0, &mut state, ti= meout()) { + Ok(()) =3D> pr_info!("vino: step 0x22(wValue=3D1) OK =3D {:02x= ?}\n", state), + Err(e) =3D> pr_info!("vino: step 0x22(wValue=3D1) non-fatal ({= e:?})\n"), + } + + // Plaintext session init (sec 4) in DLM's exact wire order. The d= ock only + // ACKs once init_4+probe arrives, and it gates on DLM's fingerpri= nt -- the + // interleaved GET_DESCRIPTOR reads (CONFIGURATION before init_0, = two STRING + // reads between init_25 and init_4). Those reads are best-effort:= the + // kernel reports EREMOTEIO on the short reply but the request sti= ll hits the + // wire (all we need). init_0/init_25/init_4+probe are separate tr= ansfers. + const STD_IN: u8 =3D 0x80; // dev->host, standard, device + let mut desc =3D KVec::from_elem(0u8, 618, GFP_KERNEL)?; + let _ =3D dev.control_recv(0x06, STD_IN, 0x0200, 0, &mut desc[..40= ], timeout()); // CONFIG, 40 + let _ =3D dev.control_recv(0x06, STD_IN, 0x0200, 0, &mut desc, tim= eout()); // CONFIG, 618 + + // Log EP02's bulk wMaxPacketSize from the config descriptor. If i= t is 64 then a 64-byte + // msg0/arm is an exact multiple and the in-kernel `usb_bulk_msg` = path (unlike libusb's + // LIBUSB_TRANSFER_ADD_ZERO_PACKET) won't auto-append the terminat= ing ZLP -- the dock's SIE + // would then wait for more data and never hand the frame to firmw= are. Rules the ZLP-trap + // hypothesis in or out from data we already capture. Walk the sta= ndard descriptor chain + // (bLength/bDescriptorType), find the ENDPOINT (0x05) descriptor = for bEndpointAddress 0x02. + { + let total =3D ((desc[2] as usize) | ((desc[3] as usize) << 8))= .min(desc.len()); + let mut i =3D 0usize; + while i + 2 <=3D total { + let blen =3D desc[i] as usize; + if blen =3D=3D 0 { + break; + } + if desc[i + 1] =3D=3D 0x05 && i + 7 <=3D total && desc[i += 2] =3D=3D EP_CTRL_OUT { + let wmax =3D (desc[i + 4] as u16) | ((desc[i + 5] as u= 16) << 8); + pr_info!("vino: EP02 bulk wMaxPacketSize =3D {wmax} (Z= LP needed if msg0 is a multiple)\n"); + } + i +=3D blen; + } + } + + let load_bearing =3D |label: &str, msg: &[u8]| -> Result { + match dev.bulk_send(EP_CTRL_OUT, msg, timeout()) { + Ok(_) =3D> Ok(pr_info!("vino: step {label} OK ({} B)\n", m= sg.len())), + Err(e) =3D> { + pr_err!("vino: step {label} FAILED ({e:?})\n"); + Err(e) + } + } + }; + load_bearing("init_0", &proto::init_0()?)?; + load_bearing("init_25", &proto::init_25()?)?; + // DLM's two interleaved STRING reads between init_25 and init_4+p= robe. + let _ =3D dev.control_recv(0x06, STD_IN, 0x0300, 0x0000, &mut desc= [..255], timeout()); // STRING #0 + let _ =3D dev.control_recv(0x06, STD_IN, 0x0303, 0x0409, &mut desc= [..255], timeout()); // STRING #3 en-US + load_bearing("init_4+probe", &proto::init_4_probe()?)?; + + // Read the single ACK that follows init_4+probe. + let mut ack =3D KVec::from_elem(0u8, 1024, GFP_KERNEL)?; + match dev.bulk_recv(EP_CTRL_IN, &mut ack, timeout()) { + Ok(n) =3D> Ok(pr_info!("vino: session-init ACK =3D {n} bytes: = {:02x?}\n", + &ack[..n.min(40)])), + Err(e) =3D> { + pr_err!("vino: session-init ACK read FAILED ({e:?})\n"); + Err(e) + } + } + } + +} + +kernel::usb_device_table!( + USB_TABLE, + MODULE_USB_TABLE, + ::IdInfo, + [(usb::DeviceId::from_id(VID_DISPLAYLINK, PID_D6000), ())] +); + +impl usb::Driver for VinoDriver { + type IdInfo =3D (); + // The driver instance is itself the per-bound device-private data. + type Data<'bound> =3D Self; + const ID_TABLE: usb::IdTable =3D &USB_TABLE; + + fn probe<'bound>( + intf: &'bound usb::Interface>, + _id: &usb::DeviceId, + _info: &'bound Self::IdInfo, + ) -> impl PinInit + 'bound { + let cdev: &device::Device> =3D intf.as_ref(); + // The D6000 exposes several interfaces (0/1/5/6 match us; 2-4 are= audio). + // The control endpoints (0x02/0x84) and the whole HDCP session li= ve on + // interface 0 -- drive bring-up only there so we don't run the pr= eamble and + // AKE four times and pollute the dock's state machine. Other inte= rfaces + // bind (so usbcore doesn't hand them to another driver) but stay = idle. + let ifnum =3D intf.number(); + if ifnum !=3D 0 { + // Interface 1 (app-specific/DFU) is the only other one DLM cl= aims; let everything else + // (audio 2-4, Ethernet 5-6) fall through to its proper kernel= driver. Returning ENODEV + // tells usbcore this driver doesn't handle the interface, so = it tries the next match. + if ifnum !=3D 1 { + dev_info!(cdev, "vino: declining D6000 interface {ifnum} (= left to its class driver)\n"); + return Err(ENODEV); + } + dev_info!(cdev, "vino: bound D6000 interface {ifnum} (idle -- = control is iface 0)\n"); + return Ok(Self { _intf: intf.into() }); + } + dev_info!(cdev, "vino: bound DisplayLink D6000 -- plaintext sessio= n bring-up\n"); + + // Bring-up is blocking synchronous USB I/O; hand it to the system= workqueue so + // probe() returns immediately and userspace stays responsive. 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Wed, 17 Jun 2026 08:13:00 -0700 (PDT) Received: from axion.fireburn.co.uk ([137.220.119.72]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49230a9a399sm151019305e9.14.2026.06.17.08.12.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Jun 2026 08:12:59 -0700 (PDT) From: Mike Lothian To: dri-devel@lists.freedesktop.org Cc: Mike Lothian , rust-for-linux@vger.kernel.org, Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Miguel Ojeda , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , linux-kernel@vger.kernel.org Subject: [RFC PATCH 2/7] drm/vino: add the clean-room HDCP 2.2 AKE/LC/SKE Date: Wed, 17 Jun 2026 16:12:39 +0100 Message-ID: <20260617151249.2937-3-mike@fireburn.co.uk> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260617151249.2937-1-mike@fireburn.co.uk> References: <20260617151249.2937-1-mike@fireburn.co.uk> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" After the plaintext session init, the DL3 dock requires an HDCP 2.2 session before it will accept any control-plane traffic. Add a clean-room implementation of the HDCP 2.2 authentication: the AKE (with stored-km and no-stored-km), locality check (LC) and session-key exchange (SKE), all verified against the live dock -- H', L' and V' all match, so the shared session key ks and content IV riv are established. New modules: - crypto: thin adapters onto the in-tree kernel library-crypto bindings (AES-128-ECB, AES-CMAC, HMAC-SHA256, SHA-256) used by the KDF; - rng: CSPRNG helpers for the per-session HDCP nonces/keys; - hdcp: the HDCP 2.2 key derivation (kd/dkey/ks) and H'/L'/V' verifier computation (the byte-exact KDF formulas); - ake: the HDCP 2.2 AKE wire layer (OUT message builders, IN parsing); - golden: the session-invariant plaintext capability-announce skeleton the driver re-states with this session's live AKE values right after the AKE (build_cap_announce). run_ake() drives the state machine end to end and returns the keyed Session; an on-device crypto known-answer self-test (FIPS-197 AES-128, RFC 4493 AES-CMAC) confirms the in-kernel crypto path is byte-correct. The encrypted control plane that consumes the Session lands in the next patch. Signed-off-by: Mike Lothian Assisted-by: Claude:claude-opus-4-8 [Claude-Code] --- drivers/gpu/drm/vino/ake.rs | 167 +++++++++ drivers/gpu/drm/vino/crypto.rs | 81 ++++ drivers/gpu/drm/vino/golden.rs | 69 ++++ drivers/gpu/drm/vino/hdcp.rs | 167 +++++++++ drivers/gpu/drm/vino/rng.rs | 12 + drivers/gpu/drm/vino/vino.rs | 662 ++++++++++++++++++++++++++++++++- 6 files changed, 1148 insertions(+), 10 deletions(-) create mode 100644 drivers/gpu/drm/vino/ake.rs create mode 100644 drivers/gpu/drm/vino/crypto.rs create mode 100644 drivers/gpu/drm/vino/golden.rs create mode 100644 drivers/gpu/drm/vino/hdcp.rs create mode 100644 drivers/gpu/drm/vino/rng.rs diff --git a/drivers/gpu/drm/vino/ake.rs b/drivers/gpu/drm/vino/ake.rs new file mode 100644 index 000000000000..ad79d2754c60 --- /dev/null +++ b/drivers/gpu/drm/vino/ake.rs @@ -0,0 +1,167 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! HDCP 2.2 AKE wire layer (sec 5.1 OUT framing, sec 5.2 IN parsing) -- t= he byte-exact +//! message builders the AKE state machine drives, mirroring the verified = userspace +//! oracle (`vino-driver::hdcp_msgs`). DLM hardcodes per-message `sub_size= ` / +//! `sub_len_dw` values the dock validates, so they are reproduced verbati= m rather +//! than derived. +//! +//! OUT body layout (sec 5.1), after the 16-byte sec 3 transport header: +//! ```text +//! body[0..2] u16 sub_size (DLM-fixed per message) +//! body[2..4] u16 =3D 0x0010 +//! body[4..8] u32 hdcp_seq increments 1..7 across the AKE OUT me= ssages +//! body[8..22] 14 zero bytes +//! body[22..26] u32 =3D 0x00000030 marker +//! body[26] u8 =3D 0x00 flag +//! body[27] u8 =3D msg_id +//! body[28..] HDCP payload (zero-padded to the fixed body length) +//! ``` +#![allow(dead_code)] // AKE message builders; response handlers run only a= fter CP engagement + +use super::*; + +/// HDCP 2.2 message IDs (sec 5.3). `pub(crate)` so the AKE state machine +/// ([`super::VinoDriver::run_ake`]) can match on the response IDs too. +pub(crate) mod id { + use kernel::bindings; + + // Standard HDCP 2.2 message IDs: reuse the canonical values from + // `` rather than redefining them, so vino sta= ys in + // lockstep with the kernel's HDCP definitions. Only the transport fra= ming + // around these (the DisplayLink type/sub/ctr header) is vino-specific. + pub(crate) const AKE_INIT: u8 =3D bindings::HDCP_2_2_AKE_INIT as u8; + pub(crate) const AKE_SEND_CERT: u8 =3D bindings::HDCP_2_2_AKE_SEND_CER= T as u8; + pub(crate) const AKE_NO_STORED_KM: u8 =3D bindings::HDCP_2_2_AKE_NO_ST= ORED_KM as u8; + pub(crate) const AKE_SEND_H_PRIME: u8 =3D bindings::HDCP_2_2_AKE_SEND_= HPRIME as u8; + pub(crate) const AKE_SEND_PAIRING_INFO: u8 =3D bindings::HDCP_2_2_AKE_= SEND_PAIRING_INFO as u8; + pub(crate) const LC_INIT: u8 =3D bindings::HDCP_2_2_LC_INIT as u8; + pub(crate) const LC_SEND_L_PRIME: u8 =3D bindings::HDCP_2_2_LC_SEND_LP= RIME as u8; + pub(crate) const SKE_SEND_EKS: u8 =3D bindings::HDCP_2_2_SKE_SEND_EKS = as u8; + pub(crate) const REPEATERAUTH_SEND_RECEIVERID_LIST: u8 =3D + bindings::HDCP_2_2_REP_SEND_RECVID_LIST as u8; + pub(crate) const REPEATERAUTH_SEND_ACK: u8 =3D bindings::HDCP_2_2_REP_= SEND_ACK as u8; + pub(crate) const REPEATERAUTH_STREAM_MANAGE: u8 =3D bindings::HDCP_2_2= _REP_STREAM_MANAGE as u8; + pub(crate) const REPEATERAUTH_STREAM_READY: u8 =3D bindings::HDCP_2_2_= REP_STREAM_READY as u8; + + // DisplayLink-specific message IDs with no ``= equivalent + // (the AKE_Send_rrx split and the transmitter/receiver-info + auth-st= atus messages + // the DL3 dock uses), kept as literals. + pub(crate) const AKE_SEND_RRX: u8 =3D 0x06; + pub(crate) const RECEIVER_AUTH_STATUS: u8 =3D 0x12; + pub(crate) const AKE_TRANSMITTER_INFO: u8 =3D 0x13; + pub(crate) const AKE_RECEIVER_INFO: u8 =3D 0x14; +} + +/// transport `sub_id` for HDCP OUT messages (type=3D4 sub=3D0x04, sec 5.1= ). +const SUB_HDCP: u16 =3D 0x04; + +/// Allocate a `body_len`-byte zeroed body with the sec 5.1 header filled = in +/// (`sub_size`, the `0x0010` marker, `hdcp_seq`, the `0x30` marker and `m= sg_id`). +/// The caller writes the payload into `body[28..]`. +fn body(body_len: usize, sub_size: u16, hdcp_seq: u32, msg_id: u8) -> Resu= lt> { + let mut b =3D KVec::from_elem(0u8, body_len, GFP_KERNEL)?; + b[0..2].copy_from_slice(&sub_size.to_le_bytes()); + b[2..4].copy_from_slice(&0x0010u16.to_le_bytes()); + b[4..8].copy_from_slice(&hdcp_seq.to_le_bytes()); + b[22..26].copy_from_slice(&0x0000_0030u32.to_le_bytes()); + b[27] =3D msg_id; + Ok(b) +} + +/// Wrap a finished HDCP body in the sec 3 transport header (type=3D4 sub= =3D0x04) with +/// the DLM-fixed `sub_len_dw` and the transport `seq`. +fn wrap(sub_len_dw: u16, seq: u32, body: &[u8]) -> Result> { + let mut frame =3D KVec::with_capacity(16 + body.len(), GFP_KERNEL)?; + proto::push_frame_with(&mut frame, 0x04, SUB_HDCP, sub_len_dw, seq, bo= dy)?; + Ok(frame) +} + +/// `AKE_Init` (msg_id 0x02): `rtx[8] || TxCaps[3]`, padded to a 48-byte b= ody +/// (`sub_size=3D0x22`, `sub_len_dw=3D0x0c` -- guide sec 5.4 table). +pub(super) fn ake_init( + hdcp_seq: u32, + seq: u32, + rtx: &[u8; 8], + tx_caps: &[u8; 3], +) -> Result> { + let mut b =3D body(48, 0x0022, hdcp_seq, id::AKE_INIT)?; + b[28..36].copy_from_slice(rtx); + b[36..39].copy_from_slice(tx_caps); + wrap(0x000c, seq, &b) +} + +/// `AKE_Transmitter_Info` (msg_id 0x13): byte-exact DLM framing +/// (`sub_size=3D0x1f`, `sub_len_dw=3D0x0f`), payload `00 06 02 00 02`. +pub(super) fn ake_transmitter_info(hdcp_seq: u32, seq: u32) -> Result> { + let mut b =3D body(48, 0x001f, hdcp_seq, id::AKE_TRANSMITTER_INFO)?; + b[28..33].copy_from_slice(&[0x00, 0x06, 0x02, 0x00, 0x02]); + wrap(0x000f, seq, &b) +} + +/// `AKE_No_Stored_km` (msg_id 0x04): the 128-byte RSA-OAEP-SHA256 `Ekpub(= km)` +/// in a 160-byte body (`sub_size=3D0x9a`, `sub_len_dw=3D0x04` -- guide se= c 5.4 table). +pub(super) fn ake_no_stored_km( + hdcp_seq: u32, + seq: u32, + ekpub_km: &[u8; 128], +) -> Result> { + let mut b =3D body(160, 0x009a, hdcp_seq, id::AKE_NO_STORED_KM)?; + b[28..156].copy_from_slice(ekpub_km); + wrap(0x0004, seq, &b) +} + +/// `LC_Init` (msg_id 0x09): `rn[8]` in a 48-byte body +/// (`sub_size=3D0x22`, `sub_len_dw=3D0x0c`). +pub(super) fn lc_init(hdcp_seq: u32, seq: u32, rn: &[u8; 8]) -> Result> { + let mut b =3D body(48, 0x0022, hdcp_seq, id::LC_INIT)?; + b[28..36].copy_from_slice(rn); + wrap(0x000c, seq, &b) +} + +/// `SKE_Send_Eks` (msg_id 0x0b): `Edkey(ks)[16] || riv[8]` in a 64-byte b= ody +/// (`sub_size=3D0x32`, `sub_len_dw=3D0x0c`). +pub(super) fn ske_send_eks( + hdcp_seq: u32, + seq: u32, + edkey_ks: &[u8; 16], + riv: &[u8; 8], +) -> Result> { + let mut b =3D body(64, 0x0032, hdcp_seq, id::SKE_SEND_EKS)?; + b[28..44].copy_from_slice(edkey_ks); + b[44..52].copy_from_slice(riv); + wrap(0x000c, seq, &b) +} + +/// `RepeaterAuth_Send_ACK` (msg_id 0x0f): the full `V[16]` in a 48-byte b= ody +/// (`sub_size=3D0x2a`, `sub_len_dw=3D0x04`). +pub(super) fn repeater_auth_send_ack( + hdcp_seq: u32, + seq: u32, + v: &[u8; 16], +) -> Result> { + let mut b =3D body(48, 0x002a, hdcp_seq, id::REPEATERAUTH_SEND_ACK)?; + b[28..44].copy_from_slice(v); + wrap(0x0004, seq, &b) +} + +/// `RepeaterAuth_Stream_Manage` SM2 (msg_id 0x10): byte-exact DLM replica= sent +/// after Send_ACK -- `k=3D2` (LE), `StreamID_Type[0]=3D4` (LE), `body[43]= =3D0x05` +/// (`sub_size=3D0x2d`, `sub_len_dw=3D0x01`). See guide sec 5.4 and sec 8.= 2. +pub(super) fn repeater_auth_stream_manage(hdcp_seq: u32, seq: u32) -> Resu= lt> { + let mut b =3D body(48, 0x002d, hdcp_seq, id::REPEATERAUTH_STREAM_MANAG= E)?; + b[32..36].copy_from_slice(&[0x02, 0, 0, 0]); // k =3D 2 (LE) + b[36..40].copy_from_slice(&[0x04, 0, 0, 0]); // StreamID_Type[0] =3D 4= (LE) + b[43] =3D 0x05; + wrap(0x0001, seq, &b) +} + +/// Parse an IN HDCP message body (sec 5.2): `body[8]` marker, `body[9]` m= sg_id, +/// `body[10..]` payload (for `AKE_Send_Cert`, `body[10]` is a version fla= g). +/// Returns `(msg_id, payload)`. +pub(super) fn parse_in(body: &[u8]) -> Option<(u8, &[u8])> { + if body.len() < 10 { + return None; + } + Some((body[9], &body[10..])) +} diff --git a/drivers/gpu/drm/vino/crypto.rs b/drivers/gpu/drm/vino/crypto.rs new file mode 100644 index 000000000000..04203db81991 --- /dev/null +++ b/drivers/gpu/drm/vino/crypto.rs @@ -0,0 +1,81 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! Thin adapters onto the shared [`kernel::crypto`] library-crypto bindin= gs, so the +//! protocol code keeps its `crypto::aes128_ecb` / `crypto::hmac_sha256` c= all sites. +#![allow(dead_code)] // exercised by the AES-CTR seal + HDCP AKE + +use super::*; + +/// `AES_ECB(key, block)` -- one 16-byte AES-128 block. +pub(super) fn aes128_ecb(key: &[u8; 16], block: &[u8; 16]) -> Result<[u8; = 16]> { + kernel::crypto::Aes128::new(*key).encrypt_block(block) +} + +/// `HMAC-SHA256(key, data)`. +pub(super) fn hmac_sha256(key: &[u8], data: &[u8]) -> [u8; 32] { + kernel::crypto::hmac_sha256(key, data) +} + +/// `AES-CMAC-128(key, data)` (RFC 4493), built on the one-block ECB above. +/// This is DisplayLink's "Dl3Cmac" core -- the CP per-message integrity t= ag is +/// `AES_CMAC(ks, nonce8 || BE64(counter) || content)` (see `cp::dl3cmac_t= ag`); +/// verified byte-exact against live DLM data (canonical guide sec 8.6.7). +pub(super) fn aes_cmac(key: &[u8; 16], data: &[u8]) -> Result<[u8; 16]> { + // dbl: left-shift the 128-bit value by 1, XOR 0x87 if the MSB was set. + fn dbl(b: &[u8; 16]) -> [u8; 16] { + let mut o =3D [0u8; 16]; + for i in 0..15 { + o[i] =3D (b[i] << 1) | (b[i + 1] >> 7); + } + o[15] =3D b[15] << 1; + if b[0] & 0x80 !=3D 0 { + o[15] ^=3D 0x87; + } + o + } + let l =3D aes128_ecb(key, &[0u8; 16])?; + let k1 =3D dbl(&l); + let k2 =3D dbl(&k1); + let n =3D if data.is_empty() { 1 } else { data.len().div_ceil(16) }; + let complete =3D !data.is_empty() && data.len() % 16 =3D=3D 0; + let mut c =3D [0u8; 16]; + for i in 0..n { + let mut blk =3D [0u8; 16]; + let start =3D i * 16; + let end =3D core::cmp::min(start + 16, data.len()); + blk[..end - start].copy_from_slice(&data[start..end]); + if i =3D=3D n - 1 { + if complete { + for j in 0..16 { + blk[j] ^=3D k1[j]; + } + } else { + blk[end - start] =3D 0x80; // 10* padding + for j in 0..16 { + blk[j] ^=3D k2[j]; + } + } + } + for j in 0..16 { + blk[j] ^=3D c[j]; + } + c =3D aes128_ecb(key, &blk)?; + } + Ok(c) +} + +/// `SHA256(data)`. +pub(super) fn sha256(data: &[u8]) -> [u8; 32] { + kernel::crypto::sha256(data) +} + +/// Raw RSA public-key op `out =3D input^exponent mod modulus`, big-endian, +/// `out` written fixed-width (caller applies OAEP padding to `input`). +pub(super) fn rsa_pubkey_encrypt( + modulus: &[u8], + exponent: &[u8], + input: &[u8], + out: &mut [u8], +) -> Result { + kernel::crypto::rsa_pubkey_encrypt(modulus, exponent, input, out) +} diff --git a/drivers/gpu/drm/vino/golden.rs b/drivers/gpu/drm/vino/golden.rs new file mode 100644 index 000000000000..e379e888c9c8 --- /dev/null +++ b/drivers/gpu/drm/vino/golden.rs @@ -0,0 +1,69 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! Captured DisplayLink control-plane protocol templates. +//! +//! These are NOT replay dumps of an encrypted session. They are the +//! session-invariant *plaintext skeletons* of two control-plane bursts ca= ptured +//! from the proprietary DisplayLinkManager (DLM). The driver overwrites t= he +//! session-specific fields with THIS session's live values and then seals= the +//! result under the live `ks`, so the bytes that reach the wire are this +//! session's own, never the capture's. They remain inline here because the +//! field-by-field live builders that would replace them are not yet writt= en -- +//! see the "help wanted" note at the top of the file. + +/// Plaintext capability-announce skeleton: the seven `sub=3D0x10`, ctr 1.= .7 +/// frames that restate the AKE OUT messages. `build_cap_announce` walks t= his +/// and overwrites each frame's payload with this session's live AKE value +/// (rtx / Ekpub / rn / Edkey+riv / V). 590 bytes. +pub(super) const CAP_PLAIN_1080P: &[u8] =3D &[ + 0x40, 0x00, 0x00, 0x00, 0x3c, 0x00, 0x04, 0x00, 0x00, 0x00, 0x04, 0x00, + 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x22, 0x00, 0x10, 0x00, 0x01, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x00, 0x02, 0x1f, 0xe7, + 0x18, 0x56, 0x6e, 0x1f, 0xc0, 0x54, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x3c, 0x00, + 0x04, 0x00, 0x00, 0x00, 0x04, 0x00, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x1f, 0x00, 0x10, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x00, + 0x00, 0x00, 0x00, 0x13, 0x00, 0x06, 0x02, 0x00, 0x02, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0xb0, 0x00, 0x00, 0x00, 0xac, 0x00, 0x04, 0x00, 0x00, 0x00, 0x04, 0x00, + 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x9a, 0x00, 0x10, 0x00, 0x03, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x00, 0x04, 0x0e, 0xd9, + 0x2f, 0x05, 0xee, 0x3e, 0xca, 0x40, 0x7e, 0x14, 0x9f, 0x9d, 0x12, 0x6c, + 0xca, 0x1a, 0x70, 0x27, 0x55, 0x02, 0x22, 0x0c, 0xde, 0x7d, 0x79, 0x6b, + 0x13, 0x14, 0x32, 0x62, 0xef, 0x62, 0xc0, 0xf2, 0xb6, 0x3d, 0x41, 0x21, + 0xcf, 0xbd, 0x2a, 0x40, 0xf9, 0xe8, 0x42, 0xc7, 0xbb, 0xa7, 0xcd, 0x8c, + 0x53, 0xab, 0x56, 0x4e, 0x5b, 0xf8, 0x55, 0x0a, 0x05, 0x96, 0x09, 0x28, + 0xbb, 0xf9, 0xbe, 0xc9, 0xe8, 0x81, 0x32, 0xaa, 0xc8, 0x49, 0x27, 0x3c, + 0x80, 0x5c, 0x7c, 0xb8, 0x23, 0x54, 0xb6, 0xe0, 0x38, 0x71, 0x3c, 0xdd, + 0xa6, 0x77, 0x91, 0x16, 0x3f, 0xd4, 0xec, 0xfd, 0xdd, 0x56, 0xf7, 0x01, + 0xe1, 0x6c, 0x03, 0x50, 0xdf, 0x80, 0xd5, 0x93, 0x66, 0x55, 0xe1, 0xd7, + 0x3b, 0x55, 0x7e, 0x9c, 0xb7, 0x71, 0xfe, 0x0b, 0x7d, 0x1c, 0x0d, 0x6b, + 0x18, 0xda, 0xdb, 0xbe, 0x79, 0x75, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, + 0x00, 0x00, 0x3c, 0x00, 0x04, 0x00, 0x00, 0x00, 0x04, 0x00, 0x0c, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x22, 0x00, 0x10, 0x00, 0x04, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x00, 0x09, 0xf4, 0xc4, 0x61, 0x0d, + 0xe0, 0x75, 0x99, 0xf5, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x50, 0x00, 0x00, 0x00, 0x4c, 0x00, 0x04, 0x00, + 0x00, 0x00, 0x04, 0x00, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x32, 0x00, + 0x10, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, + 0x00, 0x0b, 0xb2, 0xd9, 0xbd, 0x87, 0x94, 0x1b, 0xf0, 0xec, 0x59, 0x40, + 0xf2, 0xba, 0xd5, 0x6d, 0x24, 0xab, 0x56, 0xfe, 0x0c, 0xff, 0xbc, 0x3a, + 0x9d, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x3c, 0x00, 0x04, 0x00, 0x00, 0x00, + 0x04, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2a, 0x00, 0x10, 0x00, + 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x00, 0x0f, + 0x38, 0x08, 0x3b, 0x1f, 0x39, 0x61, 0xb4, 0x9b, 0x3a, 0x2e, 0x9a, 0x1c, + 0xbd, 0x64, 0x78, 0x85, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, + 0x3c, 0x00, 0x04, 0x00, 0x00, 0x00, 0x04, 0x00, 0x01, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x2d, 0x00, 0x10, 0x00, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x30, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, + 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, + 0x00, 0x00, +]; diff --git a/drivers/gpu/drm/vino/hdcp.rs b/drivers/gpu/drm/vino/hdcp.rs new file mode 100644 index 000000000000..c22d58b624ab --- /dev/null +++ b/drivers/gpu/drm/vino/hdcp.rs @@ -0,0 +1,167 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! HDCP 2.2 key derivation and verifier computation (sec 5.6), built on [= `crypto`]. +//! Lets the driver run a clean-room AKE without DisplayLink's binary; the= byte-exact +//! formulas are verified against the live dock in the guide. +#![allow(dead_code)] // some HDCP builders/handlers are reached only after= CP engagement + +use super::*; + +/// `dkey_n =3D AES_ECB(km with low-8-bytes XOR rn, rtx || (rrx with byte1= 5 XOR n))` +/// (HDCP 2.2 IIA sec 2.7, sec 5.6). The counter `n` XORs into byte 15 (LS= B of the rrx +/// half) of the IV; `rn` XORs into the low 8 bytes (km[8..16]) of the key= -- zero +/// for the `kd` derivation, the SKE nonce for `dkey_2`. +fn derive_dkey( + km: &[u8; 16], + rn: &[u8; 8], + rtx: &[u8; 8], + rrx: &[u8; 8], + n: u8, +) -> Result<[u8; 16]> { + let mut iv =3D [0u8; 16]; + iv[..8].copy_from_slice(rtx); + iv[8..].copy_from_slice(rrx); + iv[15] ^=3D n; + let mut key =3D *km; + for i in 0..8 { + key[8 + i] ^=3D rn[i]; + } + crypto::aes128_ecb(&key, &iv) +} + +/// `kd =3D dkey_0 || dkey_1` with `rn =3D 0` (sec 5.6) -- the 256-bit der= ived key. +pub(super) fn derive_kd(km: &[u8; 16], rtx: &[u8; 8], rrx: &[u8; 8]) -> Re= sult<[u8; 32]> { + let rn =3D [0u8; 8]; + let dkey0 =3D derive_dkey(km, &rn, rtx, rrx, 0)?; + let dkey1 =3D derive_dkey(km, &rn, rtx, rrx, 1)?; + let mut kd =3D [0u8; 32]; + kd[..16].copy_from_slice(&dkey0); + kd[16..].copy_from_slice(&dkey1); + Ok(kd) +} + +/// `H' =3D HMAC-SHA256(kd, rtx with byte7 ^=3D repeater)` (sec 5.6). +pub(super) fn compute_h(kd: &[u8; 32], rtx: &[u8; 8], repeater: bool) -> [= u8; 32] { + let mut msg =3D *rtx; + msg[7] ^=3D repeater as u8; + crypto::hmac_sha256(kd, &msg) +} + +/// `L' =3D HMAC-SHA256(kd with low-8-bytes XOR rrx, rn)` (sec 5.6). +/// +/// "low-8-bytes" is the *least-significant* 64 bits of the 256-bit `kd`, = i.e. +/// `kd[24..32]` -- verified byte-exact against the live dock by the users= pace +/// oracle (`vino-hdcp::kdf::compute_l`). XOR-ing into `kd[0..8]` does not= verify. +pub(super) fn compute_l(kd: &[u8; 32], rrx: &[u8; 8], rn: &[u8; 8]) -> [u8= ; 32] { + let mut key =3D *kd; + for i in 0..8 { + key[24 + i] ^=3D rrx[i]; + } + crypto::hmac_sha256(&key, rn) +} + +/// Full `V =3D HMAC-SHA256(kd, list_header)` (256 bits) for RepeaterAuth = (sec 2.3). +/// The **MSB-128** (`[..16]`) is `V'` -- verified against the repeater's +/// `RepeaterAuth_Send_ReceiverID_List` trailer. The **LSB-128** (`[16..]`= ) is the +/// value the transmitter returns in `RepeaterAuth_Send_Ack`. vino had bee= n sending +/// the MSB (i.e. echoing the dock's own `V'`) as the Ack -- so the dock r= ejected the +/// repeater authentication, never acknowledged Stream_Manage, and never e= ngaged CP +/// (proven 2026-06-11: vino's ctr6 =3D=3D the dock's `id=3D0x21` list tra= iler; DLM's ctr6 +/// is a computed value present in no dock push). H'/L'/V' still pass beca= use V' +/// verification uses the MSB. +pub(super) fn compute_v_full(kd: &[u8; 32], list_header: &[u8]) -> [u8; 32= ] { + crypto::hmac_sha256(kd, list_header) +} + +/// MGF1 mask generation (RFC 8017 sec B.2.1) with SHA-256: returns `mask_= len` +/// bytes of `T =3D SHA256(seed || I2OSP(0,4)) || SHA256(seed || I2OSP(1,4= )) || ...`. +fn mgf1_sha256(seed: &[u8], mask_len: usize) -> Result> { + let mut mask =3D KVec::with_capacity(mask_len, GFP_KERNEL)?; + let mut counter: u32 =3D 0; + let mut block =3D KVec::with_capacity(seed.len() + 4, GFP_KERNEL)?; + while mask.len() < mask_len { + block.clear(); + block.extend_from_slice(seed, GFP_KERNEL)?; + block.extend_from_slice(&counter.to_be_bytes(), GFP_KERNEL)?; + let digest =3D crypto::sha256(&block); + let take =3D core::cmp::min(digest.len(), mask_len - mask.len()); + mask.extend_from_slice(&digest[..take], GFP_KERNEL)?; + counter +=3D 1; + } + Ok(mask) +} + +/// EME-OAEP encode (RFC 8017 sec 7.1.1) with SHA-256 and an empty label, = for a +/// `k`-byte modulus. Returns the `k`-byte encoded message `EM` ready for = the +/// raw RSA op. `seed` is `hLen` (32) random bytes. HDCP 2.2 uses SHA-256 = here +/// (SHA-1 makes the dock stop responding -- guide sec 5.4). +fn eme_oaep_encode(k: usize, msg: &[u8], seed: &[u8; 32]) -> Result> { + const HLEN: usize =3D 32; + // DB =3D lHash || PS(zeros) || 0x01 || M, length k - hLen - 1. + let l_hash =3D crypto::sha256(&[]); + let db_len =3D k - HLEN - 1; + let mut db =3D KVec::with_capacity(db_len, GFP_KERNEL)?; + db.extend_from_slice(&l_hash, GFP_KERNEL)?; + let ps_len =3D db_len - HLEN - 1 - msg.len(); // k - mLen - 2*hLen - 2 + for _ in 0..ps_len { + db.push(0, GFP_KERNEL)?; + } + db.push(0x01, GFP_KERNEL)?; + db.extend_from_slice(msg, GFP_KERNEL)?; + // maskedDB =3D DB ^ MGF1(seed, db_len). + let db_mask =3D mgf1_sha256(seed, db_len)?; + for i in 0..db_len { + db[i] ^=3D db_mask[i]; + } + // maskedSeed =3D seed ^ MGF1(maskedDB, hLen). + let seed_mask =3D mgf1_sha256(&db, HLEN)?; + let mut masked_seed =3D [0u8; HLEN]; + for i in 0..HLEN { + masked_seed[i] =3D seed[i] ^ seed_mask[i]; + } + // EM =3D 0x00 || maskedSeed || maskedDB. + let mut em =3D KVec::with_capacity(k, GFP_KERNEL)?; + em.push(0x00, GFP_KERNEL)?; + em.extend_from_slice(&masked_seed, GFP_KERNEL)?; + em.extend_from_slice(&db, GFP_KERNEL)?; + Ok(em) +} + +/// RSA-OAEP-SHA256 encrypt the 16-byte master key `km` under the dock's +/// RSA-1024 public key (`modulus[128]`, `exponent`), giving the 128-byte +/// `Ekpub(km)` for `AKE_No_Stored_km` (sec 5.4). Generates a fresh OAEP s= eed. +pub(super) fn oaep_encrypt_km( + modulus: &[u8; 128], + exponent: &[u8], + km: &[u8; 16], +) -> Result<[u8; 128]> { + let mut seed =3D [0u8; 32]; + super::rng::fill(&mut seed); + let em =3D eme_oaep_encode(128, km, &seed)?; + let mut out =3D [0u8; 128]; + crypto::rsa_pubkey_encrypt(modulus, exponent, &em, &mut out)?; + Ok(out) +} + +/// SKE: `Edkey(ks) =3D ks XOR (dkey_2 with low-8-bytes XOR rrx)` (sec 5.6= ). +/// +/// `dkey_2` is derived with the SKE nonce `rn` mixed into the key; `rrx` = then +/// XORs into the low 8 bytes (`dkey_2[8..16]`) of the mask. The result is= the +/// 16-byte `Edkey_ks` carried by `SKE_Send_Eks` (msg_id 0x0b). +pub(super) fn compute_eks( + km: &[u8; 16], + rtx: &[u8; 8], + rrx: &[u8; 8], + rn: &[u8; 8], + ks: &[u8; 16], +) -> Result<[u8; 16]> { + let mut mask =3D derive_dkey(km, rn, rtx, rrx, 2)?; + for i in 0..8 { + mask[8 + i] ^=3D rrx[i]; + } + let mut edkey_ks =3D [0u8; 16]; + for i in 0..16 { + edkey_ks[i] =3D ks[i] ^ mask[i]; + } + Ok(edkey_ks) +} diff --git a/drivers/gpu/drm/vino/rng.rs b/drivers/gpu/drm/vino/rng.rs new file mode 100644 index 000000000000..8720d55174ae --- /dev/null +++ b/drivers/gpu/drm/vino/rng.rs @@ -0,0 +1,12 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! Cryptographically-secure randomness for the per-session HDCP nonces/ke= ys +//! (`rtx`, `km`, `rn`, `ks`, `riv`, the OAEP seed). +#![allow(dead_code)] // RNG helpers; some are reached only on the post-eng= agement CP path + +/// Fills `buf` with random bytes from the kernel CSPRNG (`get_random_byte= s`). +pub(super) fn fill(buf: &mut [u8]) { + // SAFETY: `buf` is valid for writes of `buf.len()` bytes; `get_random= _bytes` + // writes exactly that many and never sleeps/faults on a kernel buffer. + unsafe { kernel::bindings::get_random_bytes(buf.as_mut_ptr().cast(), b= uf.len()) }; +} diff --git a/drivers/gpu/drm/vino/vino.rs b/drivers/gpu/drm/vino/vino.rs index 79f446041b64..db4c38b6dc92 100644 --- a/drivers/gpu/drm/vino/vino.rs +++ b/drivers/gpu/drm/vino/vino.rs @@ -6,19 +6,45 @@ //! This is an `[RFC]` work-in-progress, posted to ask for help. It is a c= lean-room //! reverse-engineered replacement for the proprietary DisplayLinkManager = userspace //! daemon + the EVDI kernel module, written natively in Rust against the = in-tree USB, -//! crypto and DRM/KMS bindings. +//! crypto and DRM/KMS bindings (the prerequisite binding patches are post= ed as their +//! own series). //! -//! This first patch is the skeleton: it binds the dock over USB and runs = the plaintext -//! connect handshake (the control-request preamble and the three bulk ini= t messages over -//! the Rust USB bulk + control transfer API). The HDCP 2.2 AKE, the AES-C= TR/AES-CMAC -//! control plane, the Vino codec and the DRM/KMS sink are added in the fo= llowing patches. +//! # What works +//! +//! On probe the driver runs, all on real hardware (Dell Universal Dock D6= 000): +//! - the plaintext connect handshake over the Rust USB bulk + control tra= nsfer API; +//! - the clean-room HDCP 2.2 AKE / LC / SKE -- H', L' and V' all verify a= gainst the +//! dock, so the session key `ks` is established and shared; +//! - the AES-CTR + AES-CMAC ("Dl3Cmac") control-plane seal, byte-exact ag= ainst the +//! reference daemon's captured wire; +//! - the plaintext `type=3D2 sub=3D0x24` stream-open arm marker; and +//! - registration of a real `struct drm_device` (see [`drm_sink`]) via th= e simple +//! display pipe, so the dock appears to userspace as a mode-settable GE= M/dumb DRM +//! card, with a live EP08 framebuffer-scanout hook on every page-flip. +//! +//! # What does NOT work -- the wall (help wanted) +//! +//! After the arm marker the driver sends the first encrypted control-plan= e frame +//! (msg0) and the dock **never acknowledges it** (`wsub=3D0x45` ack count= stays 0), so +//! the CP cipher never engages and no pixels ever flow. Every host-observ= able channel +//! has been matched to the reference daemon -- the bulk wire is byte-iden= tical through +//! the arm + msg0, the AKE verifies, the seal/MAC/IV are byte-exact, the = full EP0 +//! control-transfer set matches, the endpoint set matches, the arm timing= is tighter +//! than the daemon's -- and the dock still silently drops our encrypted C= P while it +//! engages the daemon's. The gate appears to be something not visible on = the host wire +//! (dock-internal session state, or a whole-bus timing/ordering property = a per-channel +//! diff cannot see). **If you know the DL3 / DisplayLink control-plane en= gagement +//! sequence, or have ideas for the remaining paired full-bus diff, please= help.** +//! +//! Note: `send_cp_setup` builds msg0's body field-by-field except for a s= mall captured +//! cap-announce skeleton ([`golden`]); a fully field-derived cap-announce= is open work. //! //! Device: VID 0x17e9 (DisplayLink) / PID 0x6006 (Dell Universal Dock D60= 00). =20 use kernel::{ alloc::flags::GFP_KERNEL, device::{self, Core}, - error::code::ENODEV, + error::code::{ENODEV, EINVAL}, prelude::*, sync::{aref::ARef, Arc}, time::Delta, @@ -34,6 +60,9 @@ /// Control + per-head bulk endpoints (guide sec 2). const EP_CTRL_OUT: u8 =3D 0x02; const EP_CTRL_IN: u8 =3D 0x84; +/// EP84 (dock->host) drain buffer size. The dock's capability block can r= each ~5.8 KiB, so a +/// single bulk read needs a generously sized buffer to avoid truncating a= nd misframing it. +const EP84_BUF: usize =3D 16384; =20 /// USB transfer timeout used during bring-up. fn timeout() -> Delta { @@ -41,6 +70,26 @@ fn timeout() -> Delta { } =20 mod proto; +mod crypto; +mod rng; +mod hdcp; +mod ake; +mod golden; + +/// The shared secrets a completed HDCP 2.2 AKE leaves behind: the SKE ses= sion key +/// `ks` and content IV `riv` key the AES-CTR control plane (sec 6), and `= kd` is kept +/// for any further repeater verification. Consumed by the Phase 2b/2c CP = + video. +#[allow(dead_code)] // ks/riv/kd are consumed by the post-engagement CP st= ream (open blocker) +struct Session { + ks: [u8; 16], + riv: [u8; 8], + kd: [u8; 32], + /// The 7-frame **plaintext capability-announce** to send between the = init markers and + /// the arm marker (see `VinoDriver::build_cap_announce`). Built LIVE + /// from this session's AKE values (rtx/ekpub/rn/edkey+riv/V) -- NOT a= stale replay. Empty + /// for a non-repeater dock (the announce path is only exercised on th= e D6000, repeater=3D1). + cap_announce: KVec, +} =20 /// Per-bound-interface driver state. struct VinoDriver { @@ -80,21 +129,94 @@ impl WorkItem for BringUp { fn run(this: Arc) { let cdev: &device::Device =3D this.intf.as_ref(); let dev: &usb::Device =3D this.intf.as_ref(); - // WIP scaffold: attempt the plaintext bring-up. Bind regardless o= f the outcome -- - // there is no display path yet (the HDCP AKE, control plane and D= RM sink land in - // the following patches). + // WIP scaffold: plaintext bring-up then the clean-room HDCP 2.2 A= KE/LC/SKE. Bind + // regardless of the outcome; the control plane and DRM sink land = in later patches. match VinoDriver::bring_up(dev) { - Ok(()) =3D> dev_info!(cdev, "vino: plaintext session init OK\n= "), + Ok(()) =3D> { + dev_info!(cdev, "vino: plaintext session init OK\n"); + match VinoDriver::run_ake(dev) { + Ok(session) =3D> { + dev_info!(cdev, "vino: HDCP AKE + LC + SKE complet= e (session keyed)\n"); + // Dev diagnostic: the live session key/riv, so th= e dock's encrypted + // EP84 replies can be decoded offline from a usbm= on capture. Behind + // pr_debug, so compiled out unless dynamic debug = is enabled. + pr_debug!("vino: SESSION ks=3D{:02x?} riv=3D{:02x?= }\n", &session.ks, &session.riv); + } + Err(e) =3D> dev_info!(cdev, "vino: HDCP AKE incomplete= ({e:?}) -- WIP\n"), + } + } Err(e) =3D> dev_info!(cdev, "vino: session init incomplete ({e= :?}) -- WIP\n"), } } } =20 +/// On-device crypto known-answer self-test. Confirms the IN-KERNEL crypto= path (which the CP seal +/// depends on) is byte-correct -- something only ever checked offline (Py= thon `verify-kdf.py`) +/// before. +/// Runs three checks and logs PASS/FAIL: +/// 1. AES-128-ECB vs the FIPS-197 test vector. +/// 2. AES-CMAC vs the RFC 4493 test vector (subkey + full-block path). +/// 3. The full `cp::seal_livemac` vs cold-ref's REAL msg0: known plaint= ext + known `ks`/`riv` +/// must reproduce the captured wire ciphertext+tag byte-for-byte. A = FAIL here (with 1+2 +/// passing) would localize a bug in our seal framing; a FAIL in 1/2 = means the kernel +/// primitive itself is wrong. If all PASS, the crypto we send is cor= rect and the +/// CP-engagement wall is NOT our crypto. +fn crypto_selftest() { + use core::sync::atomic::{AtomicBool, Ordering}; + static RAN: AtomicBool =3D AtomicBool::new(false); + if RAN.swap(true, Ordering::Relaxed) { + return; + } + + // 1. AES-128-ECB KAT (FIPS-197 Appendix B / C.1). + let ecb_key =3D [ + 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, = 0x0b, 0x0c, 0x0d, 0x0e, + 0x0f, + ]; + let ecb_pt =3D [ + 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, = 0xbb, 0xcc, 0xdd, 0xee, + 0xff, + ]; + let ecb_expect =3D [ + 0x69, 0xc4, 0xe0, 0xd8, 0x6a, 0x7b, 0x04, 0x30, 0xd8, 0xcd, 0xb7, = 0x80, 0x70, 0xb4, 0xc5, + 0x5a, + ]; + match crypto::aes128_ecb(&ecb_key, &ecb_pt) { + Ok(out) if out =3D=3D ecb_expect =3D> pr_info!("vino: selftest AES= -128-ECB PASS\n"), + Ok(out) =3D> pr_err!("vino: selftest AES-128-ECB FAIL got=3D{out:0= 2x?}\n"), + Err(e) =3D> pr_err!("vino: selftest AES-128-ECB ERR ({e:?})\n"), + } + + // 2. AES-CMAC KAT (RFC 4493 sec 4 example 2: a single 16-byte block). + let cmac_key =3D [ + 0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, = 0x88, 0x09, 0xcf, 0x4f, + 0x3c, + ]; + let cmac_msg =3D [ + 0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x7e, = 0x11, 0x73, 0x93, 0x17, + 0x2a, + ]; + let cmac_expect =3D [ + 0x07, 0x0a, 0x16, 0xb4, 0x6b, 0x4d, 0x41, 0x44, 0xf7, 0x9b, 0xdd, = 0x9d, 0xd0, 0x4a, 0x28, + 0x7c, + ]; + match crypto::aes_cmac(&cmac_key, &cmac_msg) { + Ok(out) if out =3D=3D cmac_expect =3D> pr_info!("vino: selftest AE= S-CMAC PASS\n"), + Ok(out) =3D> pr_err!("vino: selftest AES-CMAC FAIL got=3D{out:02x?= }\n"), + Err(e) =3D> pr_err!("vino: selftest AES-CMAC ERR ({e:?})\n"), + } +} + impl VinoDriver { /// Plaintext session bring-up (sec 4): control-request preamble then = the three /// bulk init messages, reading the single ACK. Best-effort during sca= ffold /// bring-up -- errors are logged, not fatal. fn bring_up(dev: &usb::Device) -> Result { + // Verify the KERNEL crypto path is byte-correct before we rely on= it for CP. The KDF was + // only ever checked offline (Python); this confirms the in-kernel= AES-ECB, AES-CMAC and the + // full `seal_livemac` reproduce ground-truth vectors on THIS devi= ce. Logs PASS/FAIL once. + crypto_selftest(); + // Control-request preamble (sec 4): dock-id read, interface selec= tion, then the // vendor_out 0x24 / vendor_in 0x22 pairs that kick off the HDCP p= ath. (The // GET_DESCRIPTOR string reads DLM also issues look cosmetic and a= re omitted.) @@ -320,6 +442,526 @@ fn bring_up(dev: &usb::Device) -> Result { } } =20 + + /// Whether to service EP83 (interrupt-IN status) during bring-up. Mea= sured 2026-06-16 + /// (paired-coldbus-20260616-162650): DLM polls EP83 0x in the pre-arm= window (14x total, all + /// post-engagement) while vino polled it 5x pre-arm -- injecting inte= rrupt-IN traffic into the + /// critical arm/msg0 window that DLM never generates. Disabled so the= pre-arm wire matches DLM; + /// re-enable if a post-engagement status channel is ever needed (DLM = only services it once the + /// dock has already acked). + const POLL_EP83_DURING_BRINGUP: bool =3D false; + + /// Reads the next HDCP response (type=3D4 sub=3D0x25, sec 5.2) from E= P `0x84`, + /// skipping any non-HDCP frames (e.g. plain ACKs) in between, and ret= urns the + /// parsed `(msg_id, payload)`. Bounded retry so a chatty dock can't w= edge us. + fn recv_hdcp(dev: &usb::Device) -> Result<(u8, KVec)> { + const SUB_HDCP_RESP: u16 =3D 0x25; + let mut buf =3D KVec::from_elem(0u8, 4096, GFP_KERNEL)?; + for _ in 0..24 { + // Read EP84 FIRST. The dock replies to AKE messages sub-milli= second (DLM cold capture: + // ~0.1-0.7 ms between EP84 IN frames), but it interleaves sta= tus/cap pushes that we + // skip. Polling EP83 (a ~2 ms idle wait) BEFORE every read ad= ded ~2 ms x + // N-skipped-frames + // of latency per reply -- making vino's AKE ~400 ms vs DLM's = ~62 ms, slow enough that + // the + // dock starts downstream HDCP and NAKs our arm/Stream_Manage.= So only service EP83 when + // EP84 came back empty (same reorder as `drain_ep84`). See th= e cold wire diff. + let n =3D dev.bulk_recv(EP_CTRL_IN, &mut buf, timeout())?; + if n < 16 { + if Self::POLL_EP83_DURING_BRINGUP { + Self::poll_ep83(dev); + } + continue; + } + // DIAGNOSTIC (2026-06-11): log EVERY frame the dock returns d= uring the AKE -- + // including + // wsub!=3D0x25 and cap-block (sub=3D0x84) pushes we'd otherwi= se skip -- so we can see + // whether + // the dock interleaves its capability blocks with the HDCP re= plies (the suspected + // reason + // its cap phase never completes / it won't engage CP). Inner = id/sub at off 16/18. + { + let wsub =3D u16::from_le_bytes([buf[8], buf[9]]); + let iid =3D if n >=3D 18 { u16::from_le_bytes([buf[16], bu= f[17]]) } else { 0 }; + let isub =3D if n >=3D 20 { u16::from_le_bytes([buf[18], b= uf[19]]) } else { 0 }; + pr_debug!("vino: AKE-EP84 {n}B wsub=3D{wsub:#x} inner_id= =3D{iid:#x} inner_sub=3D{isub:#x}\n"); + } + if u16::from_le_bytes([buf[8], buf[9]]) !=3D SUB_HDCP_RESP { + continue; // non-HDCP frame -- skip + } + if let Some((id, payload)) =3D ake::parse_in(&buf[16..n]) { + // Inner msg_id 0 is a status/ACK frame (the dock emits on= e as a + // sub=3D0x25 frame after each OUT message, e.g. the `14 0= 0 76 00...` + // frame after AKE_Init) -- skip it and keep reading for t= he real + // HDCP response, mirroring the oracle's recv_hdcp_msg. + if id =3D=3D 0 { + continue; + } + let mut pl =3D KVec::with_capacity(payload.len(), GFP_KERN= EL)?; + pl.extend_from_slice(payload, GFP_KERNEL)?; + return Ok((id, pl)); + } + } + Err(EINVAL) + } + + + /// Pace like DLM after a RepeaterAuth OUT (ctr6 Send_Ack / ctr7 Strea= m_Manage): + /// read the dock's per-frame `id=3D0x14 sub=3D0x10` ack off EP84 BEFO= RE the next OUT, + /// so vino never transmits while the dock is mid-NAK. + /// + /// Ground truth (cold wire diff, captures/dlm-cold-20260611-123347 vs= vino-cold): + /// DLM reads that ack after EVERY cap/AKE OUT -- + /// ctr4->ack->ctr5->ack->ctr6->ack->ctr7-> + /// ack->arm, ~0.2 ms apart, whole ctr7->arm gap 0.46 ms. Commit d74a4= d7 dropped the + /// drain for ctr6/ctr7, so `run_ake` sent ctr6->ctr7 back-to-back wit= h no read; the + /// dock (busy with downstream HDCP after SKE) then NAK'd each OUT ~10= 0 ms (vino's + /// V'->arm gap measured ~200 ms), and the arm landed after the dock h= ad left its + /// freshly-keyed CP window -> CP never engaged (0 `wsub=3D0x45`). Res= toring the read + /// re-paces vino to DLM and lets the arm land tight. Best-effort: ret= urns as soon as + /// the matching ack arrives, or immediately if nothing is queued (doc= k idle). + fn pace_cap_ack(dev: &usb::Device, want_ctr: u16) { + let Ok(mut buf) =3D KVec::from_elem(0u8, 4096, GFP_KERNEL) else { + return; + }; + for _ in 0..8 { + match dev.bulk_recv(EP_CTRL_IN, &mut buf, Delta::from_millis(3= 0)) { + Ok(len) if len >=3D 22 =3D> { + let wsub =3D u16::from_le_bytes([buf[8], buf[9]]); + let iid =3D u16::from_le_bytes([buf[16], buf[17]]); + let ictr =3D u16::from_le_bytes([buf[20], buf[21]]); + // The per-frame cap-ack: wsub=3D0x25, inner id=3D0x14= sub=3D0x10 ctr=3Dwant. + // An interleaved cap push (sub=3D0x84) or earlier ack= -- keep reading. + if wsub =3D=3D 0x25 && iid =3D=3D 0x14 && ictr =3D=3D = want_ctr { + return; + } + } + // Nothing queued within the short window -- the dock is i= dle, don't block. + _ =3D> return, + } + } + } + + + /// After ctr7 (Stream_Manage) and its ack, WAIT for the dock's termin= al capability block + /// `id=3D0x0b sub=3D0x84` before letting the caller arm. This is the = dock's "cap-complete" + /// signal: DLM receives it and only then arms (cold-ref: `id=3D0x21` = @52.1465 -> `id=3D0x0b` + /// @52.1469 -> arm @52.1474). vino's lockstep ([`pace_cap_ack`]) only= consumed the `id=3D0x14` + /// ctr acks, so it armed right after ctr7's ack -- BEFORE the dock ha= d emitted `id=3D0x0b` + /// (vino received every other cap block id=3D0x213/0x0d/0x10/0x28/0x1= 8/0x21 but armed one push + /// early). The dock then NAK'd msg0 ~100 ms and dumped a 16 KB error = block + /// (`type=3D0x1003 wsub=3D0x37`) that DLM never produces, instead of = engaging CP -- the true + /// gate, found on cold plug `vino-cold-20260612-080549`. The dock emi= ts `id=3D0x0b` a few ms + /// after `id=3D0x21` once it settles downstream HDCP, so draining EP8= 4 until it arrives keeps + /// the arm tight (DLM ~ 0.5 ms after ctr7) yet correctly ordered. Bes= t-effort, bounded. + fn wait_cap_complete(dev: &usb::Device, kd: &[u8; 32]) { + let Ok(mut buf) =3D KVec::from_elem(0u8, EP84_BUF, GFP_KERNEL) els= e { + return; + }; + // Drain EP84 until the dock goes QUIET, not merely until id=3D0x0= b. Cold plug #2 + // (vino-cold-20260612-082707) showed DLM's LAST pre-arm push is t= he id=3D0x28 that + // follows id=3D0x0b (cold-ref: id=3D0x0b@52.1469 -> ack ctr7 -> i= d=3D0x28@52.1472 -> + // arm@52.1474), + // whereas vino stopped at id=3D0x0b and armed -- leaving id=3D0x2= 8 (and the rest of the dock's + // terminal cap burst) un-drained in the dock's EP84 queue. With i= ts IN queue backed up the + // dock NAK'd vino's msg0 ~100 ms (it can't accept the OUT while i= t still owes IN data) and + // then dumped the 16 KB error block. So after id=3D0x0b, keep rea= ding until a read times out + // (the dock has sent everything), then return so the caller arms = into a clean dock -- like + // DLM. Bounded: id=3D0x0b is the marker; QUIET_GAP short reads of= silence end the drain. + // + // * 2026-06-12 (HDCP 2.3 Adaptation sec RepeaterAuth, pdfs/): one= of the frames drained + // here is + // the dock's `RepeaterAuth_Stream_Ready` (HDCP msg 0x11) -- the 3= rd `id=3D0x28` DLM receives + // and + // vino historically did not. The spec requires the transmitter to= RECEIVE it within 100 ms + // of + // `Stream_Manage` and verify `M =3D=3D M'` before transmitting co= ntent; the dock's exactly-100 + // ms + // msg0 NAK on a cold plug is that window. We now RECOGNISE it in = this same drain (no added + // latency vs the old broken 10x1 s poll) and log `M'` plus candid= ate `M`s so the next + // capture + // pins the exact `STREAMID_TYPE || seq_num_M` the dock hashes. Th= e HDCP msg_id rides at + // `body[9]` =3D `buf[25]` in an EP84 reply (`ake::parse_in`); `M'= [32]` follows at + // `buf[26..58]`. + // Verification is logged-only for now (the DisplayLink field offs= ets in `Stream_Manage` are + // not yet confirmed, so a wrong guess must not block the arm); th= e arm is gated on + // receiving + // Stream_Ready when it arrives, else on the existing id=3D0x0b + = quiet fallback. `M` key is + // `SHA256(kd)`; `M =3D HMAC-SHA256(STREAMID_TYPE || seq_num_M, SH= A256(kd))`, seq_num_M =3D 0. + let sha_kd =3D crypto::sha256(kd); + let mut saw_0b =3D false; + let mut saw_ready =3D false; + let mut quiet =3D 0usize; + const QUIET_GAP: usize =3D 3; // ~3 consecutive empty short reads = =3D> dock done pushing + const MAX_ROUNDS: usize =3D 48; + for _ in 0..MAX_ROUNDS { + match dev.bulk_recv(EP_CTRL_IN, &mut buf, Delta::from_millis(5= )) { + Ok(len) if len >=3D 20 =3D> { + quiet =3D 0; + let iid =3D u16::from_le_bytes([buf[16], buf[17]]); + let isub =3D u16::from_le_bytes([buf[18], buf[19]]); + let mid =3D if len >=3D 26 { buf[25] } else { 0 }; // = HDCP msg_id (body[9]) + if isub =3D=3D 0x84 && iid =3D=3D 0x0b { + saw_0b =3D true; + } + if mid =3D=3D ake::id::REPEATERAUTH_STREAM_READY && le= n >=3D 58 { + saw_ready =3D true; + let mprime =3D &buf[26..58]; + pr_info!("vino: AKE: Stream_Ready (0x11) M'=3D{mpr= ime:02x?}\n"); + // M =3D HMAC-SHA256(SHA256(kd), data) where data = is the Content Stream + // Management input the dock hashes: `k` 7-byte st= ream entries followed by + // the 3-byte `seq_num_M` (=3D0 on the first Strea= m_Manage). Cracked from the + // DLM aarch64 decompile (`FUN_0057be04`: data =3D= memcpy(streams, k*7) || + // BE16(field) || field, keyed by the 32-byte SHA2= 56(kd) at session+0x37); + // reproduces DLM's captured M' byte-exact (captur= es/.../FINDINGS.md). + // vino's + // two streams carry the same StreamID_Type bytes = its Stream_Manage sends + // (`repeater_auth_stream_manage`: type 0x04 and 0= x05), so the dock computes + // the same M. (Earlier code guessed a 5-byte STRE= AMID_TYPE||seq layout and + // so + // always mismatched -- host-side only, never gate= d the dock.) + let m_data: [u8; 17] =3D [ + 0, 0, 0, 0x04, 0, 0, 0, // stream 0: StreamID_= Type[0] =3D 4 + 0, 0, 0, 0x05, 0, 0, 0, // stream 1: StreamID_= Type[1] =3D 5 + 0, 0, 0, // seq_num_M =3D 0 (first Stream_Mana= ge, big-endian) + ]; + let m =3D crypto::hmac_sha256(&sha_kd, &m_data); + let eq =3D if &m[..] =3D=3D mprime { "=3D=3D" } el= se { "!=3D" }; + pr_info!("vino: AKE: M {} M' (CSM stream-entry l= ayout)\n", eq); + } else if mid =3D=3D ake::id::RECEIVER_AUTH_STATUS && = len >=3D 27 { + pr_info!("vino: AKE: RECEIVER_AUTH_STATUS=3D0x{:02= x}\n", buf[26]); + } + // * 2026-06-12: arm the INSTANT both terminal markers= have arrived -- the + // cap-complete + // id=3D0x0b AND the Stream_Ready (the trailing id=3D0= x28 / HDCP 0x11). DLM arms + // 0.46 ms + // after its last cap block; a cold-plug cadence diff + // (vino-cold-20260612-113706) showed + // vino was instead waiting QUIET_GAP x 5 ms of EMPTY = reads AFTER already + // seeing both + // markers, landing the arm ~68 ms late -- outside the= dock's freshly-keyed CP + // window, so + // the dock errored on the arm (27 KB type=3D0x1001 du= mp) instead of engaging. + // Once both + // markers are in, the terminal burst is complete; arm= now, like DLM. (The + // empty-read + // quiet path below remains the fallback when Stream_R= eady never arrives.) + if saw_0b && saw_ready { + pr_info!("vino: cap-complete (id=3D0x0b + Stream_R= eady 0x11) -- arming now\n"); + return; + } + } + // Empty/short read =3D a quiet window. Fallback when Stre= am_Ready (0x11) never + // arrives: + // once id=3D0x0b has arrived AND the dock has been quiet = for QUIET_GAP rounds, the + // terminal burst is drained -- arm now. + _ =3D> { + if saw_0b { + quiet +=3D 1; + if quiet >=3D QUIET_GAP { + pr_info!( + "vino: cap-complete drained (id=3D0x0b{}+ = quiet) -- arming now\n", + if saw_ready { ", Stream_Ready 0x11, " } e= lse { " (no 0x11) " } + ); + return; + } + } + } + } + } + pr_info!( + "vino: cap-complete drain budget hit (saw_0b=3D{saw_0b} saw_re= ady=3D{saw_ready}) -- arming anyway\n" + ); + } + + + /// Drives a full clean-room HDCP 2.2 AKE + LC + SKE (and RepeaterAuth= for a + /// repeater sink) over EP `0x02`/`0x84`, verifying `H'`, `L'` and `V'= ` against + /// our own KDF (sec 5). On success returns the [`Session`] keys. + /// + /// All HDCP transfers use transport `seq=3D0`; the `hdcp_seq` counter= increments + /// 1..7 across the OUT messages (sec 5.1). Best-effort: any mismatch/= short read + /// aborts with an error the caller logs. + fn run_ake(dev: &usb::Device) -> Result { + use ake::id; + + // Flush any STALE EP84 frames the dock still has queued from a PR= IOR session before + // starting a fresh AKE. On a warm rmmod/insmod re-probe the dock = is not power-cycled, so + // its previous CP/cap replies (including a multi-KB residual bloc= k) sit in its EP84 queue; + // if we don't drain them, the first `recv_hdcp` picks up a stale = frame and the whole AKE + // reply stream is shifted. Harmless on a true cold plug -- the qu= eue is already empty, so + // the first read just times out. Best-effort. + if let Ok(mut flush) =3D KVec::from_elem(0u8, EP84_BUF, GFP_KERNEL= ) { + let mut flushed =3D 0usize; + for _ in 0..32 { + match dev.bulk_recv(EP_CTRL_IN, &mut flush, Delta::from_mi= llis(20)) { + Ok(n) if n > 0 =3D> flushed +=3D 1, + _ =3D> break, + } + } + if flushed > 0 { + pr_info!("vino: flushed {flushed} stale EP84 frame(s) befo= re AKE\n"); + } + } + + // (1) AKE_Init -- fresh rtx, TxCaps =3D 00 00 00 (DLM-exact). + let mut rtx =3D [0u8; 8]; + rng::fill(&mut rtx); + dev.bulk_send(EP_CTRL_OUT, &ake::ake_init(1, 0, &rtx, &[0; 3])?, t= imeout())?; + + // (2) AKE_Send_Cert: payload =3D REPEATER(1) || cert_rx(522). Ext= ract the + // RSA-1024 public key (modulus[5..133], exponent[133..136]). + let (cid, cert_msg) =3D Self::recv_hdcp(dev)?; + if cid !=3D id::AKE_SEND_CERT || cert_msg.len() < 1 + 136 { + pr_err!("vino: AKE: bad AKE_Send_Cert (id=3D{cid:#x}, {} B)\n"= , cert_msg.len()); + return Err(EINVAL); + } + let repeater =3D cert_msg[0] !=3D 0; + let cert =3D &cert_msg[1..]; + let mut modulus =3D [0u8; 128]; + modulus.copy_from_slice(&cert[5..133]); + let mut exponent =3D [0u8; 3]; + exponent.copy_from_slice(&cert[133..136]); + + // (3) AKE_Transmitter_Info, then (4) read AKE_Receiver_Info (RxCa= ps unused). + dev.bulk_send(EP_CTRL_OUT, &ake::ake_transmitter_info(2, 0)?, time= out())?; + let _ =3D Self::recv_hdcp(dev)?; + + // (5) AKE_No_Stored_km -- fresh km, RSA-OAEP-SHA256 to Ekpub(km). + let mut km =3D [0u8; 16]; + rng::fill(&mut km); + let ekpub =3D hdcp::oaep_encrypt_km(&modulus, &exponent, &km)?; + dev.bulk_send(EP_CTRL_OUT, &ake::ake_no_stored_km(3, 0, &ekpub)?, = timeout())?; + + // (6) AKE_Send_Rrx. + let (rid, rrx_pl) =3D Self::recv_hdcp(dev)?; + if rid !=3D id::AKE_SEND_RRX || rrx_pl.len() < 8 { + pr_err!("vino: AKE: bad AKE_Send_Rrx (id=3D{rid:#x})\n"); + return Err(EINVAL); + } + let mut rrx =3D [0u8; 8]; + rrx.copy_from_slice(&rrx_pl[..8]); + + // (7)/(8) AKE_Send_H_prime -- verify H' =3D HMAC(kd, rtx^REPEATER= ). + let (hid, hp) =3D Self::recv_hdcp(dev)?; + if hid !=3D id::AKE_SEND_H_PRIME || hp.len() < 32 { + pr_err!("vino: AKE: bad H' (id=3D{hid:#x})\n"); + return Err(EINVAL); + } + let kd =3D hdcp::derive_kd(&km, &rtx, &rrx)?; + if hdcp::compute_h(&kd, &rtx, repeater)[..] !=3D hp[..32] { + pr_err!("vino: AKE: H' mismatch -- authentication failed\n"); + return Err(EINVAL); + } + pr_info!("vino: AKE: H' verified\n"); + + // (9) AKE_Send_Pairing_Info (Ekh_km) -- read and discard (no-stor= ed path). + let _ =3D Self::recv_hdcp(dev)?; + + // (10) Locality Check -- LC_Init(rn) then verify L'. + let mut rn =3D [0u8; 8]; + rng::fill(&mut rn); + dev.bulk_send(EP_CTRL_OUT, &ake::lc_init(4, 0, &rn)?, timeout())?; + let (lid, lp) =3D Self::recv_hdcp(dev)?; + if lid !=3D id::LC_SEND_L_PRIME || lp.len() < 32 { + pr_err!("vino: AKE: bad L' (id=3D{lid:#x})\n"); + return Err(EINVAL); + } + if hdcp::compute_l(&kd, &rrx, &rn)[..] !=3D lp[..32] { + pr_err!("vino: AKE: L' mismatch -- locality check failed\n"); + return Err(EINVAL); + } + pr_info!("vino: AKE: L' verified\n"); + + // (11) Session Key Exchange -- send Edkey(ks) || riv. The session= key and IV are + // fresh-random per session. + let mut ks =3D [0u8; 16]; + let mut riv =3D [0u8; 8]; + rng::fill(&mut ks); + rng::fill(&mut riv); + let edkey =3D hdcp::compute_eks(&km, &rtx, &rrx, &rn, &ks)?; + // Dev diagnostic: the full SKE secrets, so the SKE delivery can b= e verified OFFLINE + // (edkey =3D=3D ks XOR derive_dkey(km,rtx,rrx,rn,2), and the dock= unwrapping to the same ks). + // Behind pr_debug, so compiled out unless dynamic debug is enable= d. + pr_debug!("vino: SKE-SECRETS km=3D{km:02x?} rtx=3D{rtx:02x?} rrx= =3D{rrx:02x?} rn=3D{rn:02x?}\n"); + pr_debug!("vino: SKE-SECRETS ks=3D{ks:02x?} edkey=3D{edkey:02x?}\n= "); + // * riv DERIVATION -- THE CP-ENGAGEMENT BUG, FIXED 2026-06-11. + // The SKE delivers the BASE riv (byte7 low-3 head/direction-selec= tor bits cleared); the + // dock + // derives the per-direction CP riv from that base. GROUND TRUTH f= rom cold-ref AND the live + // vino cold-plug diff (captures/dlm-cold-20260611-123347 + vino-c= old-20260611-130522): + // delivered base byte7 =3D e8 -> host OUT-CP riv =3D ec (base | 0= x04) -> dock IN-CP riv =3D ed + // (^1). + // vino had been sealing OUT-CP with the RAW random `riv` (byte7 e= .g. f9 =3D base f8 | 0x01) + // while delivering base f8 -- so the dock, deriving its keystream= from f8 (expecting + // host-OUT + // =3D fc), could NOT decrypt vino's CP and SILENTLY DROPPED every= post-arm frame (0 sub=3D0x45, + // EP84 dead after the arm) even though ks/seal/MAC/frame-format w= ere all byte-correct. The + // off-by-one-bit IV was the whole wall. Fix: deliver base, seal O= UT with base | 0x04. + // The SKE delivers the FULL random riv as-is (DLM does NOT mask t= he low bits -- verified + // on + // two decrypted DLM sessions: cold-ref delivers ...e8, dl3cmac de= livers ...e7). The host CP + // OUT riv =3D delivered XOR 0x04 (flip byte7 bit 2): cold-ref e8-= >ec, dl3cmac e7->e3. + // cp::in_riv + // then ^1 for the dock->host IN stream (ec->ed). vino had been ma= sking the delivered riv + // and + // sealing with the raw random LSBs, so the dock (deriving its key= stream as delivered^0x04) + // got a different keystream and silently dropped every CP frame. = See the vino cold-plug + // diff. + let riv_ske =3D riv; // deliver the full random riv, unmasked, exa= ctly like DLM + riv[7] ^=3D 0x04; // host OUT-CP riv =3D delivered ^ 0x04 + dev.bulk_send(EP_CTRL_OUT, &ake::ske_send_eks(5, 0, &edkey, &riv_s= ke)?, timeout())?; + // Dev diagnostic: the live session key/out-riv the dock must hold= to decrypt our CP. + pr_debug!("vino: SESSION ks=3D{ks:02x?} out_riv=3D{riv:02x?}\n"); + + // The LIVE plaintext capability-announce (`build_cap_announce`), + // built once V is known below. Empty unless the dock is a repeate= r (D6000 always is). + let mut cap_announce =3D KVec::new(); + + // (12) RepeaterAuth -- verify V' over the ReceiverID_List, ACK, t= hen SM2. + if repeater { + let (vid, list) =3D Self::recv_hdcp(dev)?; + if vid !=3D id::REPEATERAUTH_SEND_RECEIVERID_LIST || list.len(= ) < 16 { + pr_err!("vino: AKE: bad ReceiverID_List (id=3D{vid:#x})\n"= ); + return Err(EINVAL); + } + let split =3D list.len() - 16; + // V =3D HMAC(kd, list_header): MSB-128 =3D V' (verify vs the = list trailer); + // LSB-128 =3D the RepeaterAuth_Send_Ack value (NOT the MSB --= that was THE bug). + let v_full =3D hdcp::compute_v_full(&kd, &list[..split]); + let mut v_ack =3D [0u8; 16]; + v_ack.copy_from_slice(&v_full[16..]); + if v_full[..16] !=3D list[split..] { + pr_err!("vino: AKE: V' mismatch -- repeater verification f= ailed\n"); + return Err(EINVAL); + } + pr_info!("vino: AKE: V' verified\n"); + dev.bulk_send(EP_CTRL_OUT, &ake::repeater_auth_send_ack(6, 0, = &v_ack)?, timeout())?; + // Read the dock's ctr6 ack before sending ctr7 -- DLM's locks= tep pacing, without + // which the dock NAKs the back-to-back OUTs ~100 ms each (see= `pace_cap_ack`). + Self::pace_cap_ack(dev, 6); + dev.bulk_send(EP_CTRL_OUT, &ake::repeater_auth_stream_manage(7= , 0)?, timeout())?; + // Read the dock's ctr7 ack before returning, so the caller's = arm marker lands + // tight after ctr7 (DLM: 0.46 ms) instead of while the dock i= s still NAKing. + Self::pace_cap_ack(dev, 7); + // Then drain the dock's terminal cap burst -- id=3D0x0b (cap-= complete) AND the dock's + // `RepeaterAuth_Stream_Ready` (HDCP 0x11, the 3rd id=3D0x28) = -- before the caller arms. + // DLM arms only after this burst (cold-ref: id=3D0x21 -> id= =3D0x0b -> id=3D0x28/0x11 -> + // arm); + // arming early makes the dock NAK msg0 ~100 ms and dump a 16 = KB error block instead of + // engaging. `wait_cap_complete` recognises + verifies the Str= eam_Ready in place (HDCP + // 2.3 Adaptation sec RepeaterAuth). `kd` is needed to check `= M =3D=3D M'`. + Self::wait_cap_complete(dev, &kd); + + // Build the LIVE capability-announce now that every field is = known. This is the + // plaintext re-statement of the 7 AKE OUT messages the dock r= equires between the + // init markers and the arm marker (`CP_CAP_PHASE`). See `buil= d_cap_announce`. + // Pass `riv_ske` (the value SKE_Send_Eks actually delivered),= NOT `riv` (=3D session + // OUT-CP seal riv =3D riv_ske ^ 0x04). The cap-announce ctr5 = frame is a byte-faithful + // re-statement of SKE_Send_Eks, so it must carry the IDENTICA= L riv. + cap_announce =3D Self::build_cap_announce(&rtx, &ekpub, &rn, &= edkey, &riv_ske, &v_ack)?; + } + + Ok(Session { ks, riv, kd, cap_announce }) + } + + + /// Build the LIVE plaintext **capability-announce** the dock requires= before the arm + /// marker. Ground truth: the cold-ref raw wire + /// (`captures/cold-ref-20260608-200850/`, t~36.754-36.813) shows DLM,= *after* the HDCP + /// AKE, sends 7 plaintext `type=3D4 wsub=3D0x04` frames that are a re= -statement of the 7 AKE + /// OUT messages -- `id=3D0x22/0x1f/0x9a/0x22/0x32/0x2a/0x2d`, `sub=3D= 0x10`, ctr 1-7 -- each + /// carrying THIS session's real value: f1=3Drtx, f2=3Dconst TxCaps, f= 3=3DEkpub(km)[128], + /// f4=3Drn, f5=3DEdkey(ks)[16]||riv_base[8], f6=3DV[16], f7=3Dconst S= tream_Manage config. The dock + /// ACKs each (`id=3D0x14 sub=3D0x10 ctr=3DN`) and only then engages i= ts CP cipher; skipping the + /// announce leaves it cipher-off (the long-standing "0 `sub=3D0x45` a= cks" symptom). + /// + /// [`golden::CAP_PLAIN_1080P`] is a byte-correct *skeleton* (headers/= aux/lead bytes and the + /// two constant frames are session-invariant -- verified across the c= old-ref and matched + /// sessions) but its 5 variable payloads are a STALE foreign session'= s values. Replaying it + /// verbatim delivers the dock a stale Ekpub/Edkey/riv that re-key it = to a foreign `ks` + /// (the `cap_phase`-clobbers-`ks` bug). So we clone the skeleton and = overwrite ONLY the 5 + /// session-specific payloads. Each payload sits at frame offset 44 (1= 6-byte wire header + + /// 22 inner-prefix bytes + the `30 00 00 00 00` marker + 1 lead byte = =3D 28 inner bytes), and + /// frames are stored `[u16 len][frame]`. `riv` here is the SKE-*deliv= ered* riv (`riv_ske`), + /// written verbatim -- frame 5 is a byte-faithful re-statement of `SK= E_Send_Eks`, so it must + /// carry the EXACT delivered riv. (It earlier wrote `riv & 0xF8`, whi= ch equals the delivered + /// value only when the random riv's low 3 bits are zero -- true for c= old-ref's `e8` but wrong + /// for 7 of 8 live sessions, so the dock saw a different riv in the a= nnounce than in SKE. + /// Ground truth: cold-ref ctr5 capture t=3D36.812413 delivers riv `..= .40e8` =3D=3D its SKE riv.) + fn build_cap_announce( + rtx: &[u8; 8], + ekpub: &[u8; 128], + rn: &[u8; 8], + edkey: &[u8; 16], + riv: &[u8; 8], + v: &[u8; 16], + ) -> Result> { + let mut blob =3D KVec::with_capacity(golden::CAP_PLAIN_1080P.len()= , GFP_KERNEL)?; + blob.extend_from_slice(golden::CAP_PLAIN_1080P, GFP_KERNEL)?; + + // Walk the skeleton; for each frame, overwrite the payload (at fr= ame+44) keyed by ctr. + let mut off =3D 0usize; + while off + 2 <=3D blob.len() { + let len =3D u16::from_le_bytes([blob[off], blob[off + 1]]) as = usize; + let frame =3D off + 2; + if frame + len > blob.len() { + break; + } + // ctr (inner offset 4) identifies which AKE message this anno= unce frame restates. + let ctr =3D u16::from_le_bytes([blob[frame + 16 + 4], blob[fra= me + 16 + 5]]); + let pay =3D frame + 44; // 16 hdr + 22 inner-prefix + 5 marker= + 1 lead + match ctr { + 1 =3D> blob[pay..pay + 8].copy_from_slice(rtx), // AKE_Init + 3 =3D> blob[pay..pay + 128].copy_from_slice(ekpub), // AKE= _No_Stored_km Ekpub + 4 =3D> blob[pay..pay + 8].copy_from_slice(rn), // LC_Init + 5 =3D> { + // SKE_Send_Eks: Edkey(ks)[16] || riv[8] (the delivere= d riv, verbatim) + blob[pay..pay + 16].copy_from_slice(edkey); + blob[pay + 16..pay + 24].copy_from_slice(riv); + } + 6 =3D> blob[pay..pay + 16].copy_from_slice(v), // Repeater= Auth_Send_Ack V + _ =3D> {} // ctr 2 (TxCaps) and 7 (Stream_Manage) are sess= ion-invariant + } + off =3D frame + len; + } + Ok(blob) + } + + + /// Poll EP 0x83 (interrupt-IN status endpoint). DLM submits URBs here= CONTINUOUSLY and the dock + /// pushes 6-byte status events; the dock may gate CP/downstream-HDCP = engagement on the host + /// servicing this endpoint (flagged in `vino-driver/src/bin/bringup.r= s`). vino never polled it + /// -- + /// invisible in the EP02/EP84 bulk-wire comparison. Reads up to a few= events (short timeout so + /// a + /// URB is pending when the dock pushes). `usb_bulk_msg` auto-routes t= he interrupt endpoint. + fn poll_ep83(dev: &usb::Device) -> usize { + // EP83 (interrupt-IN) transfers need DMA-capable memory -- alloca= te on the HEAP. + // A stack array trips usb_hcd_map_urb_for_dma's "transfer buffer = is on stack" + // WARNING (VMAP_STACK can't be DMA-mapped) and the broken submit = also stalls the + // bring-up (poll_ep83 runs inside every drain round). Best-effort= : bail on OOM. + let mut buf =3D match KVec::from_elem(0u8, 64, GFP_KERNEL) { + Ok(b) =3D> b, + Err(_) =3D> return 0, + }; + let mut n =3D 0usize; + // Short timeout: a pending URB gives the dock a window to push, b= ut a 30 ms block on the + // (normally idle) EP83 stalls the bring-up loop (see drain_ep84).= 2 ms is enough to catch a + // ready event without serializing the handshake. + for _ in 0..4 { + match dev.interrupt_recv(0x83, &mut buf, Delta::from_millis(2)= ) { + Ok(len) if len > 0 =3D> { + n +=3D 1; + let s =3D &buf[..len.min(8)]; + pr_info!("vino: EP83 status event {len}B {s:02x?}\n"); + } + _ =3D> break, + } + } + n + } + } =20 kernel::usb_device_table!( --=20 2.54.0 From nobody Thu Nov 5 07:36:10 2026 Received: from mail-wm1-f42.google.com (mail-wm1-f42.google.com [209.85.128.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 039FF244687 for ; Wed, 17 Jun 2026 15:13:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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Wed, 17 Jun 2026 08:13:01 -0700 (PDT) Received: from axion.fireburn.co.uk ([137.220.119.72]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49230a9a399sm151019305e9.14.2026.06.17.08.13.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Jun 2026 08:13:00 -0700 (PDT) From: Mike Lothian To: dri-devel@lists.freedesktop.org Cc: Mike Lothian , rust-for-linux@vger.kernel.org, Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Miguel Ojeda , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , linux-kernel@vger.kernel.org Subject: [RFC PATCH 3/7] drm/vino: add the AES-CTR/AES-CMAC control-plane seal and arm Date: Wed, 17 Jun 2026 16:12:40 +0100 Message-ID: <20260617151249.2937-4-mike@fireburn.co.uk> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260617151249.2937-1-mike@fireburn.co.uk> References: <20260617151249.2937-1-mike@fireburn.co.uk> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" With the HDCP session keyed, the dock's control plane (CP) is an AES-CTR-encrypted, AES-CMAC-authenticated ("Dl3Cmac") message channel. Add the cp module: the control-plane message builders (mode-set, EDID read/parse, cursor, the interactive seal) plus seal_livemac(), which encrypts and frames a CP message under the live ks/riv -- byte-exact against the reference daemon's captured wire (the on-device self-test gains a third known-answer check that reproduces the daemon's real msg0). send_cp_setup() drives the post-SKE sequence: it opens the async EP84 bulk-IN reader, sends the plaintext type=3D2 sub=3D0x24 stream-open arm marker, then the first live encrypted CP frame, and counts the dock's encrypted wsub=3D0x45 acks. The EP84 drain/parse helpers and the lockstep-reply decoder land here too. This is THE WALL: on a cold dock the ack count stays 0 -- the dock runs the entire plaintext handshake but never engages the encrypted CP (see the final patch's "help wanted" note). CP_ENGAGED is left clear, which gates the EP08 video added in a later patch. Signed-off-by: Mike Lothian Assisted-by: Claude:claude-opus-4-8 [Claude-Code] --- drivers/gpu/drm/vino/cp.rs | 635 +++++++++++++++++++++++++++++++++++ drivers/gpu/drm/vino/vino.rs | 607 ++++++++++++++++++++++++++++++++- 2 files changed, 1237 insertions(+), 5 deletions(-) create mode 100644 drivers/gpu/drm/vino/cp.rs diff --git a/drivers/gpu/drm/vino/cp.rs b/drivers/gpu/drm/vino/cp.rs new file mode 100644 index 000000000000..2668931d8500 --- /dev/null +++ b/drivers/gpu/drm/vino/cp.rs @@ -0,0 +1,635 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! Encrypted-control-plane message builders (the inner plaintext of the t= ype=3D4 +//! sub=3D0x24 AES-CTR frames) plus the AES-CTR `seal` that encrypts and f= rames them. +//! Layouts are from the reverse-engineered protocol; offsets cite the gui= de and +//! should be re-checked against a capture before they drive real hardware. +#![allow(dead_code)] // some seal/handler paths run only after the dock en= gages CP (open blocker) + +use super::*; + +/// Common CP inner header: `[id u16][sub u16][counter u16][00 00]` (sec 6= .1/sec 8.6.4). +fn header(out: &mut KVec, id: u16, sub: u16, counter: u16) -> Result { + out.extend_from_slice(&id.to_le_bytes(), GFP_KERNEL)?; + out.extend_from_slice(&sub.to_le_bytes(), GFP_KERNEL)?; + out.extend_from_slice(&counter.to_le_bytes(), GFP_KERNEL)?; + out.extend_from_slice(&[0, 0], GFP_KERNEL)?; + Ok(()) +} + +fn pad_to(out: &mut KVec, len: usize) -> Result { + while out.len() < len { + out.push(0, GFP_KERNEL)?; + } + Ok(()) +} + +/// OUT heartbeat (sec 6.1): `id=3D0x16 sub=3D0x75`, two AES blocks (`10 2= 7` at block1+6). +pub(super) fn heartbeat(counter: u16) -> Result> { + let mut b =3D KVec::with_capacity(32, GFP_KERNEL)?; + header(&mut b, 0x16, 0x75, counter)?; + pad_to(&mut b, 22)?; // block0 tail + block1[0..6] + b.extend_from_slice(&[0x10, 0x27], GFP_KERNEL)?; // block1[6..8] + pad_to(&mut b, 32)?; + Ok(b) +} + +/// OUT get-EDID request (CP-HANDSHAKE.md sec 4f): `id=3D0x15 sub=3D0x21`,= the message that asks +/// the dock to return the downstream monitor's EDID in an `id=3D0x194 sub= =3D0x21` reply (parsed +/// by [`parse_edid_from_reply`]). The request carries no payload beyond t= he inner header, so +/// it is a single 16-byte AES block; [`seal_livemac`] appends the 16-byte= Dl3Cmac. The dock +/// echoes the `counter`, so any monotonic value works. The exact request = body was never +/// captured (only the reply), so this is the minimal well-formed form -- = re-check against a +/// capture if the dock ever NAKs it once CP engages. +pub(super) fn get_edid_req(counter: u16) -> Result> { + let mut b =3D KVec::with_capacity(16, GFP_KERNEL)?; + header(&mut b, 0x15, 0x21, counter)?; + pad_to(&mut b, 16)?; + Ok(b) +} + +/// A video timing in DisplayID-Type-I terms (sec 8.6.4), as carried by the +/// `0x48/0x22` set-mode message. Field meanings and offsets are verified +/// byte-exact against the golden 3840x2160@60 capture (see [`set_mode`]). +#[derive(Clone, Copy)] +pub(super) struct Timing { + pub hactive: u16, + pub hblank: u16, + pub hsync_front: u16, + pub hsync_width: u16, + pub vactive: u16, + pub vblank: u16, + pub vsync_front: u16, + pub vsync_width: u16, + pub refresh_hz: u16, + /// Pixel clock in 10 kHz units (e.g. 0xd040 =3D 533.12 MHz for 4K@60). + pub pixel_clock_10khz: u16, + /// DisplayID field at off42 -- partly decoded (0x0604 for 4K, 0x0600 = for the + /// 2560x1440 sample in sec 8.6.4); high byte 0x06 constant, low byte = mode-varying. + pub field42: u16, +} + +impl Timing { + /// 3840x2160@60 (CVT-RB) -- the mode the non-HDCP dongle advertises, = kept as a + /// known-good reference whose `set_mode` output is byte-exact vs the = golden capture. + pub(super) const UHD_60: Timing =3D Timing { + hactive: 3840, hblank: 160, hsync_front: 48, hsync_width: 32, + vactive: 2160, vblank: 62, vsync_front: 3, vsync_width: 5, + refresh_hz: 60, pixel_clock_10khz: 0xd040, field42: 0x0604, + }; +} + +/// set-mode (sec 8.6.4): `id=3D0x48 sub=3D0x22`, a 96-byte inner message = carrying a +/// DisplayID-Type-I u16 timing record. **Verified byte-exact** against th= e golden +/// `[59]` 3840x2160@60 capture for every byte except the trailing 22-byte= session +/// MAC (off74..95), which [`seal`]'s caller / the HDCP session layer appe= nds. +/// +/// Layout (inner offsets): off20 BE u32 generation=3D2; off26 begins the = LE u16 +/// record `hactive,hblank,hsync_front,hsync_width,vactive,vblank,vsync_fr= ont, +/// vsync_width,field42,refresh,flags(0x4000)`; off48/off58/off60/off66 ca= rry +/// constants observed in the 4K capture; off70 the pixel clock (10 kHz un= its). +pub(super) fn set_mode(counter: u16, t: &Timing) -> Result> { + let mut b =3D KVec::with_capacity(96, GFP_KERNEL)?; + header(&mut b, 0x48, 0x22, counter)?; + pad_to(&mut b, 20)?; + b.extend_from_slice(&2u32.to_be_bytes(), GFP_KERNEL)?; // off20: BE ge= neration=3D2 + pad_to(&mut b, 26)?; // off24..25 zero; timing begins at off26 + for v in [ + t.hactive, t.hblank, t.hsync_front, t.hsync_width, + t.vactive, t.vblank, t.vsync_front, t.vsync_width, + t.field42, t.refresh_hz, 0x4000, /* off46 flags */ 0x6000, /* off4= 8 */ + ] { + b.extend_from_slice(&v.to_le_bytes(), GFP_KERNEL)?; + } + pad_to(&mut b, 58)?; + b.extend_from_slice(&0x0080u16.to_le_bytes(), GFP_KERNEL)?; // off58 (= observed const) + b.extend_from_slice(&0x00ffu16.to_le_bytes(), GFP_KERNEL)?; // off60 (= observed const) + pad_to(&mut b, 66)?; + b.extend_from_slice(&0x0800u16.to_le_bytes(), GFP_KERNEL)?; // off66 (= observed const) + pad_to(&mut b, 70)?; + b.extend_from_slice(&t.pixel_clock_10khz.to_le_bytes(), GFP_KERNEL)?; = // off70 + pad_to(&mut b, 96)?; + Ok(b) +} + +/// EDID base-block sanity check: length, the `00 FF..FF 00` magic, and th= e 1-byte +/// checksum (all 128 base bytes sum to 0 mod 256). A corrupt blob must ne= ver drive a +/// mode-set, so [`timing_from_edid`] rejects anything that fails this. +fn edid_valid(edid: &[u8]) -> bool { + const MAGIC: [u8; 8] =3D [0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x= 00]; + edid.len() >=3D 128 + && edid[..8] =3D=3D MAGIC + && edid[..128].iter().fold(0u8, |a, &b| a.wrapping_add(b)) =3D=3D 0 +} + +/// Parse one 18-byte EDID detailed timing descriptor into a [`Timing`], o= r `None` if it +/// is too short or not a timing (pixel clock 0 marks a monitor descriptor= ). `field42` +/// is left at the sec 8.6.4 default (`0x0600`) -- its low byte is mode-va= rying and not fully +/// decoded, so the live mode-set substitution leaves the captured value i= n place. +fn parse_dtd(d: &[u8]) -> Option { + if d.len() < 18 { + return None; + } + let pclk =3D u16::from_le_bytes([d[0], d[1]]); + if pclk =3D=3D 0 { + return None; // monitor descriptor, not a detailed timing + } + let hi =3D |v: u8, lo: u8| -> u16 { ((v as u16) << 8) | lo as u16 }; + let hactive =3D hi((d[4] >> 4) & 0xf, d[2]); + let hblank =3D hi(d[4] & 0xf, d[3]); + let vactive =3D hi((d[7] >> 4) & 0xf, d[5]); + let vblank =3D hi(d[7] & 0xf, d[6]); + let hsync_front =3D (((d[11] >> 6) & 0x3) as u16) << 8 | d[8] as u16; + let hsync_width =3D (((d[11] >> 4) & 0x3) as u16) << 8 | d[9] as u16; + let vsync_front =3D (((d[11] >> 2) & 0x3) as u16) << 4 | ((d[10] >> 4)= & 0xf) as u16; + let vsync_width =3D ((d[11] & 0x3) as u16) << 4 | (d[10] & 0xf) as u16; + let htotal =3D hactive.wrapping_add(hblank) as u32; + let vtotal =3D vactive.wrapping_add(vblank) as u32; + let refresh_hz =3D if htotal !=3D 0 && vtotal !=3D 0 { + ((pclk as u32 * 10_000 + (htotal * vtotal) / 2) / (htotal * vtotal= )) as u16 + } else { + 0 + }; + Some(Timing { + hactive, + hblank, + hsync_front, + hsync_width, + vactive, + vblank, + vsync_front, + vsync_width, + refresh_hz, + pixel_clock_10khz: pclk, + field42: 0x0600, + }) +} + +/// Extract the monitor's **preferred** detailed timing from an EDID for t= he live mode-set +/// (CP-HANDSHAKE.md sec 4e). The first DTD in the base block is the prefe= rred timing per the +/// EDID spec; scan all four base descriptor slots (off 54/72/90/108) so a= leading monitor +/// descriptor (name/range/serial) doesn't hide it, and if the base block = carries no DTD at +/// all, fall back to the first DTD in the CTA-861 extension block. The bl= ob is validated +/// first; an invalid or timing-less EDID returns `None` so the caller kee= ps its known-good +/// fallback timing rather than driving the dock with garbage. +pub(super) fn timing_from_edid(edid: &[u8]) -> Option { + if !edid_valid(edid) { + return None; + } + // Base-block descriptors: the first valid DTD is the preferred timing. + for off in [54usize, 72, 90, 108] { + if off + 18 <=3D edid.len() { + if let Some(t) =3D parse_dtd(&edid[off..off + 18]) { + return Some(t); + } + } + } + // No DTD in the base block: try the first CTA-861 extension's DTD are= a. CTA-861 blocks + // have tag 0x02 at byte 0 and a DTD-area byte offset at byte 2 (>=3D = 4 when DTDs follow); + // descriptors run in 18-byte records up to the extension's checksum b= yte (127). + if edid[126] as usize >=3D 1 && edid.len() >=3D 256 { + let ext =3D &edid[128..256]; + if ext[0] =3D=3D 0x02 { + let start =3D ext[2] as usize; + if start >=3D 4 { + let mut off =3D start; + while off + 18 <=3D 127 { + if let Some(t) =3D parse_dtd(&ext[off..off + 18]) { + return Some(t); + } + off +=3D 18; + } + } + } + } + None +} + +/// Overwrite the geometry + clock fields of an in-place set-mode inner me= ssage +/// (`id=3D0x48 sub=3D0x22`) with `t` (CP-HANDSHAKE.md sec 4e). Offsets mi= rror [`set_mode`]: +/// the LE u16 timing record at off26 and the pixel clock at off70. `field= 42` (off42), +/// the off66 token and the encrypted trailer are intentionally **left as = captured**; +/// only the EDID-derived values change, so the wire length (hence `wire_s= eq`) is +/// unchanged. No-op if `plain` is too short. +pub(super) fn apply_edid_timing(plain: &mut [u8], t: &Timing) { + if plain.len() < 72 { + return; + } + let put =3D |b: &mut [u8], off: usize, v: u16| { + b[off] =3D v as u8; + b[off + 1] =3D (v >> 8) as u8; + }; + put(plain, 26, t.hactive); + put(plain, 28, t.hblank); + put(plain, 30, t.hsync_front); + put(plain, 32, t.hsync_width); + put(plain, 34, t.vactive); + put(plain, 36, t.vblank); + put(plain, 38, t.vsync_front); + put(plain, 40, t.vsync_width); + put(plain, 44, t.refresh_hz); + put(plain, 70, t.pixel_clock_10khz); +} + +/// Convert a DRM display mode (the timing the *compositor* selected from = the connector's +/// EDID-derived mode list) into a set-mode [`Timing`]. This is what makes= the dock +/// multi-mode: `drm_edid_connector_add_modes` already advertises every ba= se+extension mode +/// from the dock's EDID, and when userspace sets any one of them the resu= lting +/// `drm_display_mode` lands here verbatim -- no re-parsing of EDID offset= s. The blanking +/// fields map straight across (CVT/DMT/DisplayID all use the same front-p= orch/sync model), +/// and the refresh rate comes from DRM's own `drm_mode_vrefresh` helper r= ather than a +/// hand-rolled divide. `field42` keeps the sec 8.6.4 default (its low byt= e is mode-varying and +/// not fully decoded); the dock tolerates the high byte `0x06`. +/// +/// SAFETY: `mode` must point to a valid `drm_display_mode` for the durati= on of the call. +pub(super) unsafe fn timing_from_drm_mode(mode: *const bindings::drm_displ= ay_mode) -> Timing { + // SAFETY: caller guarantees `mode` is a live drm_display_mode. + let m =3D unsafe { &*mode }; + // SAFETY: `drm_mode_vrefresh` only reads the mode; `mode` is valid pe= r the contract. + let refresh =3D unsafe { bindings::drm_mode_vrefresh(mode) } as u16; + let sub =3D |a: u16, b: u16| a.saturating_sub(b); + Timing { + hactive: m.hdisplay, + hblank: sub(m.htotal, m.hdisplay), + hsync_front: sub(m.hsync_start, m.hdisplay), + hsync_width: sub(m.hsync_end, m.hsync_start), + vactive: m.vdisplay, + vblank: sub(m.vtotal, m.vdisplay), + vsync_front: sub(m.vsync_start, m.vdisplay), + vsync_width: sub(m.vsync_end, m.vsync_start), + refresh_hz: refresh, + // `clock` is in kHz; the set-mode field is in 10 kHz units. + pixel_clock_10khz: (m.clock / 10).clamp(0, u16::MAX as i32) as u16, + field42: 0x0600, + } +} + +/// Decode the inner header of a dock->host CP frame: returns `(id, sub, i= ctr)` from +/// the first decrypted block (CP-HANDSHAKE.md sec 3), or `None` if `wire`= is not a +/// decryptable CP frame. Used by the live loop to log what the dock is re= plying. +pub(super) fn reply_info( + ks: &[u8; 16], + out_riv: &[u8; 8], + wire: &[u8], +) -> Option<(u16, u16, u16)> { + if wire.len() <=3D 16 { + return None; + } + let seq =3D u32::from_le_bytes([wire[12], wire[13], wire[14], wire[15]= ]); + let head =3D &wire[16..wire.len().min(32)]; + let inner =3D open_in(ks, &in_riv(out_riv), seq, head).ok()?; + if inner.len() < 6 { + return None; + } + Some(( + u16::from_le_bytes([inner[0], inner[1]]), + u16::from_le_bytes([inner[2], inner[3]]), + u16::from_le_bytes([inner[4], inner[5]]), + )) +} + +/// CP `sub` ids seen on the wire (CP-HANDSHAKE.md). Used to score a candi= date +/// decrypt: a plaintext whose `sub` is one of these (and whose post-count= er pad is +/// zero) is almost certainly the correct key/riv. +fn is_known_sub(sub: u16) -> bool { + matches!( + sub, + 0x00 | 0x04 | 0x0c | 0x10 | 0x20 | 0x21 | 0x22 | 0x24 | 0x25 | 0x3= 0 | 0x41 + | 0x42 | 0x43 | 0x45 | 0x75 | 0x84 + ) +} + +/// Diagnostic decode: try a dock->host frame under every plausible riv va= riant and +/// return the best-scoring inner `(riv_tag, id, sub, ictr)`. The interact= ive +/// `wsub=3D0x45` replies decrypt under `in_riv` (byte7^1), but the **cap-= phase** +/// `wsub=3D0x25` frames decrypt under the session ks with **byte7 unchang= ed** (the OUT +/// value) -- see the cold-ref transcript. `byte0^0x80` selects the head. = This mirrors +/// `decode-handshake.py`'s scoring so a live trace shows what the dock is= actually +/// asking for during the capability exchange we currently skip. +pub(super) fn decode_any( + ks: &[u8; 16], + out_riv: &[u8; 8], + wire: &[u8], +) -> Option<(&'static str, u16, u16, u16, [u8; 24])> { + if wire.len() <=3D 16 { + return None; + } + let seq =3D u32::from_le_bytes([wire[12], wire[13], wire[14], wire[15]= ]); + let head =3D &wire[16..wire.len().min(48)]; + let out0 =3D *out_riv; + let in0 =3D in_riv(out_riv); + let mut out1 =3D out0; + out1[0] ^=3D 0x80; + let mut in1 =3D in0; + in1[0] ^=3D 0x80; + let variants: [(&'static str, [u8; 8]); 4] =3D + [("out/h0", out0), ("in/h0", in0), ("out/h1", out1), ("in/h1", in1= )]; + let mut best: Option<(i32, &'static str, u16, u16, u16, [u8; 24])> =3D= None; + for (tag, riv) in variants.iter() { + let Ok(pt) =3D open_in(ks, riv, seq, head) else { continue }; + if pt.len() < 8 { + continue; + } + let id =3D u16::from_le_bytes([pt[0], pt[1]]); + let sub =3D u16::from_le_bytes([pt[2], pt[3]]); + let ctr =3D u16::from_le_bytes([pt[4], pt[5]]); + let pad =3D u16::from_le_bytes([pt[6], pt[7]]); + let mut sc =3D 0i32; + if is_known_sub(sub) { + sc +=3D 50; + } + if pad =3D=3D 0 { + sc +=3D 10; + } + if ctr < 0x400 { + sc +=3D 5; + } + if best.map_or(true, |b| sc > b.0) { + // Keep the first 24 plaintext bytes so the live trace shows t= he decoded + // structure (e.g. the `..4c..de..` cap-descriptor template th= at, in the + // capture, is session-independent -- its absence flags a ks/r= iv mismatch). + let mut sample =3D [0u8; 24]; + let n =3D pt.len().min(24); + sample[..n].copy_from_slice(&pt[..n]); + best =3D Some((sc, tag, id, sub, ctr, sample)); + } + } + best.map(|(_, tag, id, sub, ctr, sample)| (tag, id, sub, ctr, sample)) +} + +/// cursor create (sec 8.6.1): `id=3D0x1b sub=3D0x42`, advertises `w x h`. +pub(super) fn cursor_create(counter: u16, w: u16, h: u16) -> Result> { + let mut b =3D KVec::with_capacity(32, GFP_KERNEL)?; + header(&mut b, 0x1b, 0x42, counter)?; + pad_to(&mut b, 20)?; + b.extend_from_slice(&[0x00, 0x02, 0x00], GFP_KERNEL)?; // marker seen = in captures + b.extend_from_slice(&w.to_le_bytes(), GFP_KERNEL)?; + b.extend_from_slice(&h.to_le_bytes(), GFP_KERNEL)?; + Ok(b) +} + +/// cursor move (sec 8.6.1): `id=3D0x1a sub=3D0x43`, head id @22, X @24, Y= @26 (LE). +pub(super) fn cursor_move(counter: u16, head: u8, x: u16, y: u16) -> Resul= t> { + let mut b =3D KVec::with_capacity(28, GFP_KERNEL)?; + header(&mut b, 0x1a, 0x43, counter)?; + pad_to(&mut b, 22)?; + b.push(head, GFP_KERNEL)?; // off22 head/monitor id + b.push(1, GFP_KERNEL)?; // off23 flag + b.extend_from_slice(&x.to_le_bytes(), GFP_KERNEL)?; // off24 + b.extend_from_slice(&y.to_le_bytes(), GFP_KERNEL)?; // off26 + Ok(b) +} + +/// cursor image (sec 8.6.1): `id=3D0x1c sub=3D0x41`. Mirrors [`cursor_cre= ate`]'s header (the +/// `00 02 00` marker + `w`,`h` at off20) and appends the `w*h` BGRA bitma= p. `bgra` must be +/// `w*h*4` bytes -- DRM hands the driver a 64x64 ARGB8888 cursor buffer a= nd the caller swaps +/// it +/// to BGRA. The image sub-layout past the create-style header is capture-= unconfirmed (only the +/// id and the shared header are decoded); re-check against a capture once= CP engages. +pub(super) fn cursor_image(counter: u16, w: u16, h: u16, bgra: &[u8]) -> R= esult> { + if bgra.len() !=3D w as usize * h as usize * 4 { + return Err(EINVAL); + } + let mut b =3D KVec::with_capacity(32 + bgra.len(), GFP_KERNEL)?; + header(&mut b, 0x1c, 0x41, counter)?; + pad_to(&mut b, 20)?; + b.extend_from_slice(&[0x00, 0x02, 0x00], GFP_KERNEL)?; // marker (mirr= ors cursor_create) + b.extend_from_slice(&w.to_le_bytes(), GFP_KERNEL)?; + b.extend_from_slice(&h.to_le_bytes(), GFP_KERNEL)?; + b.extend_from_slice(bgra, GFP_KERNEL)?; + Ok(b) +} + +/// DisplayLink "Dl3Cmac" CP-message integrity tag (16 bytes) -- **FULLY S= OLVED + CROSS-SESSION +/// VERIFIED 2026-06-11** (`captures/DL3CMAC-FULLY-SOLVED-20260611.md`): +/// `tag =3D AES-CMAC(ks, mac_nonce(8) || BE64(wire_seq) || ciphertext)` w= here +/// - `mac_nonce` =3D the CTR stream `riv` **with `byte0 ^=3D 0x80`** (thi= s byte0 flip is the bit +/// prior writeups missed -- they tried `riv` / `riv^1@byte7` and OUT ne= ver verified), +/// - `wire_seq` =3D the AES-CTR block counter (frame header off-12), zero= -extended to BE64, +/// - `ciphertext` =3D the AES-CTR ciphertext content (encrypt-then-MAC), = tag appended IN CLEAR. +/// `K_dl3 =3D ks`. Proven: 110/115 OUT + 128/135 IN corpus frames AND col= d-ref msg0 (a different +/// session) reproduce byte-exact. Pass the CTR `riv` directly; the byte0 = flip is applied here. +pub(super) fn dl3cmac_tag( + ks: &[u8; 16], + riv: &[u8; 8], + wire_seq: u64, + ciphertext: &[u8], +) -> Result<[u8; 16]> { + let mut mac_nonce =3D *riv; + mac_nonce[0] ^=3D 0x80; + let mut buf =3D KVec::with_capacity(16 + ciphertext.len(), GFP_KERNEL)= ?; + buf.extend_from_slice(&mac_nonce, GFP_KERNEL)?; + buf.extend_from_slice(&wire_seq.to_be_bytes(), GFP_KERNEL)?; + buf.extend_from_slice(ciphertext, GFP_KERNEL)?; + crypto::aes_cmac(ks, &buf) +} + +/// Seal a CP message with a **freshly computed live Dl3Cmac**, reusing DL= M's captured wire +/// `header` (so `seq`/`aux` are byte-identical) but recomputing the tail = tag for THIS session. +/// `content_pt` is the real inner plaintext WITHOUT the 16-byte tag regio= n. Wire body =3D +/// `AES-CTR(ks, riv, content_pt)` || `dl3cmac_tag(...)`. This is the live= -generation path. See +/// `captures/DL3CMAC-FULLY-SOLVED-20260611.md`. +pub(super) fn seal_livemac( + ks: &[u8; 16], + riv: &[u8; 8], + header: &[u8], + content_pt: &[u8], +) -> Result> { + let seq =3D u32::from_le_bytes([header[12], header[13], header[14], he= ader[15]]); + let mut ct =3D KVec::with_capacity(content_pt.len(), GFP_KERNEL)?; + for (i, chunk) in content_pt.chunks(16).enumerate() { + let mut iv =3D [0u8; 16]; + iv[..8].copy_from_slice(riv); + iv[12..].copy_from_slice(&seq.wrapping_add(i as u32).to_be_bytes()= ); + let ksb =3D crypto::aes128_ecb(ks, &iv)?; + for (j, &p) in chunk.iter().enumerate() { + ct.push(p ^ ksb[j], GFP_KERNEL)?; + } + } + let tag =3D dl3cmac_tag(ks, riv, seq as u64, &ct)?; + let mut frame =3D KVec::with_capacity(16 + ct.len() + 16, GFP_KERNEL)?; + frame.extend_from_slice(&header[..16], GFP_KERNEL)?; + frame.extend_from_slice(&ct, GFP_KERNEL)?; + frame.extend_from_slice(&tag, GFP_KERNEL)?; + Ok(frame) +} + +/// Seal an inner CP message into a wire frame (type=3D4 sub=3D0x24, `seq`= ). DisplayLink +/// CP is **encrypt-then-MAC**: the message content is AES-CTR-encrypted, = then a +/// 16-byte Dl3Cmac tag (`AES-CMAC(ks, riv || BE64(seq) || ciphertext)`) i= s appended. +/// The keystream is `AES_ECB(ks, riv(8) || u32(0) || u32_be(seq + block))= ` (sec 6.1). +/// +/// `inner` is the captured golden plaintext `[content || stale-tag-region= (16)]`; we +/// encrypt only `content =3D inner[..len-16]` and append a **fresh** tag = keyed by our +/// live session, so the dock's Dl3Cmac verification passes (the stale rep= layed tag is +/// why the dock previously dropped our CP). VERIFIED construction (sec 8.= 6.7). +pub(super) fn seal( + ks: &[u8; 16], + riv: &[u8; 8], + seq: u32, + inner: &[u8], +) -> Result> { + // The interactive CP stream: session ks, wire sub `0x24`. + seal_stream(ks, riv, 0x24, seq, inner) +} + +/// Build a fully sealed interactive CP frame (`type=3D4 sub=3D0x24`) at `= wire_seq` over `content` +/// (the inner plaintext, WITHOUT any trailing 16-byte tag placeholder): t= he 16-byte wire +/// header -- size, `type=3D4`, `sub=3D0x24`, the per-`id` [`aux_for_id`] = field, and `wire_seq` -- +/// followed by [`seal_livemac`] (AES-CTR ciphertext + appended live Dl3Cm= ac). Shared by the +/// bring-up live loop ([`VinoDriver::send_live_cp`]) and the runtime KMS = senders +/// ([`drm_sink::VinoDrmData::send_cp`]) so both produce a byte-identical = wire frame. +pub(super) fn seal_interactive( + ks: &[u8; 16], + riv: &[u8; 8], + id: u16, + wire_seq: u32, + content: &[u8], +) -> Result> { + let body_len =3D content.len() + 16; // AES-CTR ciphertext + 16-byte D= l3Cmac + let size =3D ((16 + body_len) - 4) as u16; + let aux =3D aux_for_id(id, body_len); + let mut hdr =3D [0u8; 16]; + hdr[2..4].copy_from_slice(&size.to_le_bytes()); + hdr[4..8].copy_from_slice(&4u32.to_le_bytes()); // type=3D4 + hdr[8..10].copy_from_slice(&0x24u16.to_le_bytes()); // sub=3D0x24 (int= eractive CP) + hdr[10..12].copy_from_slice(&aux.to_le_bytes()); + hdr[12..16].copy_from_slice(&wire_seq.to_le_bytes()); + seal_livemac(ks, riv, &hdr, content) +} + +/// The CP wire-header `aux`@10 (`sub_len_dw`) field is a **strict per-inn= er-message-id +/// constant** in DLM's CP stream -- verified byte-exact across all 94 cap= tured 1080p CP +/// frames (`cp-hdrwire-1080p.bin`) -- **not** `body.len()/4`, which is wh= at `push_frame` +/// derives. Reproducing it makes a generated CP frame's header byte-ident= ical to DLM, the +/// leading hypothesis for the dock engaging its CP cipher (the dock acks = our plaintext cap +/// but emits 0 encrypted replies with the wrong `aux`). See docs/BLOCKER.= md and memory +/// `project_cp_aux_field_per_id_constant`. Unknown ids fall back to the d= word count so an +/// unrecognised message is still well-formed. This makes the generated `s= eal`/`seal_stream` +/// path match DLM without a captured-header blob -- the basis for **live*= * CP generation. +pub(super) fn aux_for_id(id: u16, body_len: usize) -> u16 { + match id { + 0x14 =3D> 0x0a, + 0x15 =3D> 0x09, + 0x16 =3D> 0x08, + 0x19 =3D> 0x05, + 0x1f =3D> 0x0f, + 0x22 =3D> 0x0c, + 0x26 =3D> 0x08, + 0x2a =3D> 0x04, + 0x32 =3D> 0x0c, + 0x48 =3D> 0x06, + 0x9a =3D> 0x04, + _ =3D> (body_len / 4) as u16, + } +} + +/// General AES-CTR seal under an arbitrary stream `key`/`riv` and wire su= b. `seal` +/// is the session-CP case (`wsub=3D0x24`); the **cap phase** (CP-HANDSHAK= E.md sec 4b) +/// needs `wsub=3D0x04` sealed under the dock's `id=3D0x32`-delivered per-= head stream key, +/// not the session ks -- which `seal` cannot express. Body construction i= s identical: +/// AES-CTR(key, riv || 0x00000000 || BE32(seq+block)) over the **whole** = inner message +/// (no appended MAC; the inner carries its own encrypted trailer -- verif= ied byte-exact +/// vs DLM, 30/30 wire frames). +pub(super) fn seal_stream( + key: &[u8; 16], + riv: &[u8; 8], + wsub: u16, + seq: u32, + inner: &[u8], +) -> Result> { + let mut ct =3D KVec::with_capacity(inner.len(), GFP_KERNEL)?; + for (i, chunk) in inner.chunks(16).enumerate() { + let mut iv =3D [0u8; 16]; + iv[..8].copy_from_slice(riv); + iv[12..].copy_from_slice(&seq.wrapping_add(i as u32).to_be_bytes()= ); + let ksb =3D crypto::aes128_ecb(key, &iv)?; + for (j, &p) in chunk.iter().enumerate() { + ct.push(p ^ ksb[j], GFP_KERNEL)?; + } + } + let mut frame =3D KVec::with_capacity(16 + ct.len(), GFP_KERNEL)?; + // DLM-exact `aux`@10: a per-inner-id constant (see `aux_for_id`), not= `body/4`. The + // id is read from the *plaintext* inner (off 0); `push_frame` would d= erive the wrong + // value and is the suspected reason the dock won't engage its CP ciph= er. + let id =3D if inner.len() >=3D 2 { u16::from_le_bytes([inner[0], inner= [1]]) } else { 0 }; + super::proto::push_frame_with(&mut frame, 0x04, wsub, aux_for_id(id, c= t.len()), seq, &ct)?; + Ok(frame) +} + +/// Derive the dock->host (IN) CP riv from the host->dock (OUT) `riv`. **I= t is the +/// SAME riv -- no transform.** Proven 2026-06-12 by decrypting a frida-ke= yed DLM cold +/// session's engaged `sub=3D0x45` replies (`captures/dlm-coldkeys-2026061= 1-135237`, logged +/// `ks`/`out_riv`): the dock's replies decrypt cleanly ONLY under the raw= `out_riv` +/// (`id=3D0x4c sub=3D0 ctr=3D8` to msg0, `id=3D0x14 sub=3D0x10` ACKs, `id= =3D0x213` cert, ...); the old +/// `byte7 ^=3D 1` gives garbage. The earlier "byte7^1 for IN" note was ne= ver validated against +/// a real engaged reply (vino never engaged) and was wrong -- it would ha= ve made vino +/// misdecode +/// every dock reply (and partly explains old "dock replies garbage under = our ks" findings). +pub(super) fn in_riv(out_riv: &[u8; 8]) -> [u8; 8] { + *out_riv +} + +/// Decrypt a dock->host CP frame body (AES-CTR, the same keystream as [`s= eal`] but +/// keyed with the IN `riv`). `ct` is the ciphertext (wire bytes after the= 16-byte +/// cleartext header); `seq` is the wire counter at wire offset 12. +pub(super) fn open_in( + ks: &[u8; 16], + in_riv: &[u8; 8], + seq: u32, + ct: &[u8], +) -> Result> { + let mut pt =3D KVec::with_capacity(ct.len(), GFP_KERNEL)?; + for (i, chunk) in ct.chunks(16).enumerate() { + let mut iv =3D [0u8; 16]; + iv[..8].copy_from_slice(in_riv); + iv[12..].copy_from_slice(&seq.wrapping_add(i as u32).to_be_bytes()= ); + let ksb =3D crypto::aes128_ecb(ks, &iv)?; + for (j, &c) in chunk.iter().enumerate() { + pt.push(c ^ ksb[j], GFP_KERNEL)?; + } + } + Ok(pt) +} + +/// If `wire` is an EDID reply (dock->host EP84, `type=3D4 sub=3D0x45`, in= ner +/// `id=3D0x194 sub=3D0x21`), decrypt it with the IN riv and return the em= bedded EDID +/// blob (base block + extensions). The EDID begins at inner offset 22; it= s total +/// length is `128 * (1 + extension_count)`, where the extension count is = base-block +/// byte 126. Returns `None` for any other frame. See docs/CONTROL-PLANE.m= d. +pub(super) fn parse_edid_from_reply( + ks: &[u8; 16], + out_riv: &[u8; 8], + wire: &[u8], +) -> Result>> { + // Wire header: [.. type@4 u32 .. sub@8 u16 .. seq@12 u32]; body at of= f16. + if wire.len() <=3D 16 || u16::from_le_bytes([wire[8], wire[9]]) !=3D 0= x45 { + return Ok(None); + } + let seq =3D u32::from_le_bytes([wire[12], wire[13], wire[14], wire[15]= ]); + let inner =3D open_in(ks, &in_riv(out_riv), seq, &wire[16..])?; + // Inner header: [id u16][sub u16][counter u16][00 00]; EDID payload a= t off22. + const EDID_OFF: usize =3D 22; + if inner.len() < EDID_OFF + 128 { + return Ok(None); + } + let id =3D u16::from_le_bytes([inner[0], inner[1]]); + let sub =3D u16::from_le_bytes([inner[2], inner[3]]); + // The get-EDID reply id is `0x194` on the wire (CP-HANDSHAKE.md sec 4= f, ground-truthed + // against the cold-ref capture); older notes wrote the low byte `0x94= ` alone. Accept + // both so a real `0x194` reply is not silently dropped (the EDID woul= d never reach the + // connector even after CP engages). + if (id !=3D 0x94 && id !=3D 0x194) || sub !=3D 0x21 { + return Ok(None); + } + let edid =3D &inner[EDID_OFF..]; + // Validate the EDID base-block magic `00 FF FF FF FF FF FF 00`. + const MAGIC: [u8; 8] =3D [0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x= 00]; + if edid[..8] !=3D MAGIC { + return Ok(None); + } + let total =3D ((1 + edid[126] as usize) * 128).min(edid.len()); + let mut out =3D KVec::with_capacity(total, GFP_KERNEL)?; + out.extend_from_slice(&edid[..total], GFP_KERNEL)?; + Ok(Some(out)) +} diff --git a/drivers/gpu/drm/vino/vino.rs b/drivers/gpu/drm/vino/vino.rs index db4c38b6dc92..ef44a625cb70 100644 --- a/drivers/gpu/drm/vino/vino.rs +++ b/drivers/gpu/drm/vino/vino.rs @@ -43,6 +43,7 @@ =20 use kernel::{ alloc::flags::GFP_KERNEL, + bindings, device::{self, Core}, error::code::{ENODEV, EINVAL}, prelude::*, @@ -63,18 +64,28 @@ /// EP84 (dock->host) drain buffer size. The dock's capability block can r= each ~5.8 KiB, so a /// single bulk read needs a generously sized buffer to avoid truncating a= nd misframing it. const EP84_BUF: usize =3D 16384; +/// Number of IN URBs kept perpetually posted on EP84 by the async reader +/// ([`usb::Device::bulk_in_queue`]); `depth - 1` stay outstanding while o= ne is serviced. +const EP84_QUEUE_DEPTH: usize =3D 4; =20 /// USB transfer timeout used during bring-up. fn timeout() -> Delta { Delta::from_millis(1000) } =20 +/// Set once the dock has actually engaged the CP cipher (`wsub=3D0x45` ac= ks > 0). EP08 video is +/// gated on it: pushing frames at a dock whose CP channel is dead makes i= t fault and USB-reset. +/// NOTE: with the current CP-engagement wall (see the file header) this i= s never set on real +/// hardware -- the dock runs the whole plaintext handshake but never enga= ges the encrypted CP. +static CP_ENGAGED: core::sync::atomic::AtomicBool =3D core::sync::atomic::= AtomicBool::new(false); + mod proto; mod crypto; mod rng; mod hdcp; mod ake; mod golden; +mod cp; =20 /// The shared secrets a completed HDCP 2.2 AKE leaves behind: the SKE ses= sion key /// `ks` and content IV `riv` key the AES-CTR control plane (sec 6), and `= kd` is kept @@ -129,18 +140,33 @@ impl WorkItem for BringUp { fn run(this: Arc) { let cdev: &device::Device =3D this.intf.as_ref(); let dev: &usb::Device =3D this.intf.as_ref(); - // WIP scaffold: plaintext bring-up then the clean-room HDCP 2.2 A= KE/LC/SKE. Bind - // regardless of the outcome; the control plane and DRM sink land = in later patches. + // WIP scaffold: plaintext bring-up, the clean-room HDCP 2.2 AKE/L= C/SKE, then the + // post-SKE CP setup. Bind regardless of the outcome -- there is n= o display path until + // the dock engages the encrypted control plane, which it currentl= y never does (see the + // "help wanted" note at the top of the file). The DRM sink lands = in a later patch. match VinoDriver::bring_up(dev) { Ok(()) =3D> { dev_info!(cdev, "vino: plaintext session init OK\n"); match VinoDriver::run_ake(dev) { Ok(session) =3D> { dev_info!(cdev, "vino: HDCP AKE + LC + SKE complet= e (session keyed)\n"); - // Dev diagnostic: the live session key/riv, so th= e dock's encrypted - // EP84 replies can be decoded offline from a usbm= on capture. Behind - // pr_debug, so compiled out unless dynamic debug = is enabled. pr_debug!("vino: SESSION ks=3D{:02x?} riv=3D{:02x?= }\n", &session.ks, &session.riv); + // Phase 2c: drive the post-SKE CP setup. send_cp_= setup re-seals DLM's + // captured setup template under THIS session's li= ve ks/riv and sends it; + // `acks` counts the dock's encrypted wsub=3D0x45 = replies. THIS IS THE WALL: + // on a cold dock `acks` stays 0 -- the dock runs = the entire plaintext + // handshake but never engages the encrypted CP. + let mut edid_out: Option> =3D None; + match VinoDriver::send_cp_setup(dev, &session, &mu= t edid_out) { + Ok((n, acks, _wseq_end, _ctr_end)) =3D> { + dev_info!(cdev, + "vino: CP setup sent -- {n} messages, = {acks} dock CP acks (wsub=3D0x45)\n"); + // CP engagement gates EP08 video (added i= n a later patch): until + // the dock acks, pushing pixels at it wed= ges the hub. + CP_ENGAGED.store(acks > 0, core::sync::ato= mic::Ordering::SeqCst); + } + Err(e) =3D> dev_info!(cdev, "vino: CP setup in= complete ({e:?}) -- WIP\n"), + } } Err(e) =3D> dev_info!(cdev, "vino: HDCP AKE incomplete= ({e:?}) -- WIP\n"), } @@ -205,6 +231,56 @@ fn crypto_selftest() { Ok(out) =3D> pr_err!("vino: selftest AES-CMAC FAIL got=3D{out:02x?= }\n"), Err(e) =3D> pr_err!("vino: selftest AES-CMAC ERR ({e:?})\n"), } + + // 3. Full seal_livemac vs cold-ref's REAL msg0 (capture t=3D36.813765= ). ks/riv are the cold-ref + // session's; content is msg0's 32-byte plaintext; the expected frame = is the captured wire. + let ks =3D [ + 0xd8, 0xb2, 0x48, 0x12, 0x44, 0x1d, 0x50, 0x82, 0x0d, 0xa3, 0xc2, = 0x71, 0xc7, 0xa3, 0x6e, + 0xc2, + ]; + let riv =3D [0xfb, 0xa7, 0xc3, 0x5f, 0xe6, 0xce, 0x40, 0xec]; + let header =3D [ + 0x00, 0x00, 0x3c, 0x00, 0x04, 0x00, 0x00, 0x00, 0x24, 0x00, 0x0a, = 0x00, 0x00, 0x00, 0x00, + 0x00, + ]; + let content =3D [ + 0x14, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, = 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x56, 0x48, 0xec, 0x9c, = 0xec, 0xc3, 0x89, 0x23, + 0x5d, 0x69, + ]; + let expect =3D [ + 0x00, 0x00, 0x3c, 0x00, 0x04, 0x00, 0x00, 0x00, 0x24, 0x00, 0x0a, = 0x00, 0x00, 0x00, 0x00, + 0x00, 0xcb, 0x4c, 0x80, 0xde, 0xf0, 0xd0, 0xfd, 0x56, 0x22, 0x5f, = 0x43, 0xbd, 0x55, 0x0d, + 0x8e, 0xc5, 0x7a, 0x1c, 0x35, 0x12, 0x81, 0x35, 0x31, 0x1a, 0x45, = 0x13, 0x91, 0x41, 0x25, + 0x87, 0xe9, 0xf7, 0xe5, 0x5b, 0xb5, 0xbc, 0x76, 0x5b, 0x2f, 0x1e, = 0x79, 0xf2, 0x8b, 0xd5, + 0x5b, 0x2c, 0x3c, 0xe7, + ]; + match cp::seal_livemac(&ks, &riv, &header, &content) { + Ok(frame) if frame.as_slice() =3D=3D expect.as_slice() =3D> { + pr_info!("vino: selftest seal_livemac(msg0) PASS -- CP crypto = reproduces cold-ref wire\n") + } + Ok(frame) =3D> { + // Show where it first diverges so a framing/order bug is loca= lizable. + let mut at =3D frame.len().min(expect.len()); + for i in 0..at { + if frame[i] !=3D expect[i] { + at =3D i; + break; + } + } + pr_err!( + "vino: selftest seal_livemac(msg0) FAIL at byte {at} (len = {} vs {})\n", + frame.len(), + expect.len() + ); + let s =3D at.saturating_sub(0); + let e =3D (at + 16).min(frame.len()); + pr_err!("vino: got[{s}..]=3D{:02x?}\n", &frame[s..e]); + let e2 =3D (at + 16).min(expect.len()); + pr_err!("vino: exp[{s}..]=3D{:02x?}\n", &expect[s..e2]); + } + Err(e) =3D> pr_err!("vino: selftest seal_livemac(msg0) ERR ({e:?})= \n"), + } } =20 impl VinoDriver { @@ -962,6 +1038,527 @@ fn poll_ep83(dev: &usb::Device) -> usize { n } =20 + + /// Drives the post-SKE CP setup: opens the async EP84 reader, sends t= he plaintext + /// stream-open arm marker, then the first live encrypted CP frame (ms= g0), and counts the + /// dock's encrypted `wsub=3D0x45` acks. THE WALL: on a cold dock `ack= s` stays 0 -- the dock + /// runs the entire plaintext handshake but never engages the encrypte= d CP. See the "help + /// wanted" note at the top of the file. + fn send_cp_setup( + dev: &usb::Device, + session: &Session, + edid_out: &mut Option>, + ) -> Result<(usize, usize, u32, u16)> { + // 16 KiB so the dock's ~5787 B capability block is read whole (se= e [`EP84_BUF`]). + let mut resp =3D KVec::from_elem(0u8, EP84_BUF, GFP_KERNEL)?; + let mut drained =3D 0usize; + let mut acks =3D 0usize; + let mut sent =3D 0usize; + + // Plaintext `type=3D2 sub=3D0x24`+`0x45` stream-open arm marker -= - the mandatory gate + // before the first encrypted frame. + const STREAM_OPEN: [u8; 64] =3D [ + 0x00, 0x00, 0x1c, 0x00, 0x02, 0x00, 0x00, 0x00, // + 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // + 0x04, 0x00, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, // + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // + 0x00, 0x00, 0x1c, 0x00, 0x02, 0x00, 0x00, 0x00, // + 0x45, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // + 0x05, 0x00, 0x0e, 0x00, 0x00, 0x00, 0x00, 0x00, // + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // + ]; + + // Open the persistent async EP84 IN reader BEFORE the arm marker = and msg0, so + // `EP84_QUEUE_DEPTH` IN transfers are already posted when the doc= k pushes its post-arm + // reply (DLM's libusb always-pending-IN behaviour). Draining EP84= concurrently stops the + // dock's IN FIFO filling and NAKing our OUT (the sync-bulk deadlo= ck that produced a 100 ms + // msg0 NAK). RAII: dropping the queue at function exit kills+free= s the URBs. + let mut ep84_q =3D match dev.bulk_in_queue(0x04, EP84_QUEUE_DEPTH,= EP84_BUF) { + Ok(q) =3D> { + pr_info!("vino: EP84 async IN queue opened (depth=3D{EP84_= QUEUE_DEPTH})\n"); + Some(q) + } + Err(e) =3D> { + pr_info!("vino: EP84 async queue open failed ({e:?}) -- fa= lling back to sync bulk_recv\n"); + None + } + }; + + // A/B (2026-06-16): route the engagement-critical arm marker + ms= g0 through an async, + // pipelined OUT queue (`usb::Device::bulk_out_queue`) instead of = the synchronous + // `bulk_send`. This mirrors DLM's libusb execution model exactly:= each OUT URB is + // submitted and returns immediately (the HCD auto-retries NAKs un= til the URB's + // teardown), so the arm and msg0 are queued back-to-back and reap= ed afterwards rather + // than each blocking for its device-ACK round-trip before the nex= t is submitted. The + // 2026-06-15 measurement showed the *wire* (lengths + submit->com= plete latency) is + // already identical, so this is not expected to change what the d= ock receives -- it is + // the last structural host difference (sync `usb_bulk_msg` vs asy= nc submit/reap) made + // identical so a cold plug can rule it in or out. Default OFF so = vino keeps the proven + // sync path and paired diffs are not polluted; flip to test. + const CP_ASYNC_OUT: bool =3D true; + let mut out_q =3D if CP_ASYNC_OUT { + match dev.bulk_out_queue(0x02, 4, 1024) { + Ok(q) =3D> { + pr_info!("vino: EP02 async OUT queue opened (depth=3D4= ) -- libusb-style submit/reap\n"); + Some(q) + } + Err(e) =3D> { + pr_info!("vino: EP02 async OUT queue open failed ({e:?= }) -- using sync bulk_send\n"); + None + } + } + } else { + None + }; + + // Pin the EP02 DATA0/DATA1 toggle to DATA0 immediately before the= arm. This is the one + // host lever invisible to every "host exhausted" test: usbmon log= s payloads, not the + // toggle bit, and the crypto/timing work never touches it. DLM (l= ibusb async URBs) and + // vino (in-kernel blocking bulk_send) can reach the arm with EP02= at *different* parity + // after the ~9 preceding OUT transfers (7 cap-announce + arm) -- = a mismatch makes the + // dock's SIE ACK the packet at the link layer (byte-identical on = the wire) yet discard + // the payload as a duplicate, i.e. "arms clean, silently drops ms= g0". clear_halt issues + // CLEAR_FEATURE(ENDPOINT_HALT), which resets both sides' toggle t= o DATA0. Every earlier + // reset (reset_configuration at the top of bring_up, HARD_RESET, = VBUS cycle) reset the + // toggle *before* those preceding transfers, so msg0's parity was= never pinned. A/B: + // flip to `reset_configuration()` to test the heavier reset at th= e same call site. + // RESULT 2026-06-16 (cold plug vino-cold-20260616-000552): TESTED= NEGATIVE. + // clear_halt(EP02) + // fired (wire shows CLEAR_FEATURE on EP2, dmesg "toggle -> DATA0"= ) yet the dock still gave + // sub=3D0x45_acks=3D0. The toggle was NOT the gate. Left default-= OFF so vino doesn't carry an + // EP02 CLEAR_FEATURE that DLM never sends (would pollute future p= aired diffs); flip to + // test. + // Sibling result: EP02 wMaxPacketSize logged =3D 1024, so a 64-by= te msg0/arm always + // terminates + // as a natural short packet -- the ZLP-trap hypothesis is moot to= o. + const CLEAR_HALT_BEFORE_ARM: bool =3D false; + if CLEAR_HALT_BEFORE_ARM { + match dev.clear_halt(EP_CTRL_OUT) { + Ok(()) =3D> pr_info!("vino: EP02 clear_halt before arm OK = (toggle -> DATA0)\n"), + Err(e) =3D> pr_info!("vino: EP02 clear_halt before arm non= -fatal ({e:?})\n"), + } + } + + // Submit the arm marker. Async path: queue it and DO NOT flush --= leave it in flight so + // msg0 can be submitted right behind it (the pipelined arm->msg0 = burst DLM does). Sync + // path: the original blocking send. + let arm_res =3D match out_q.as_mut() { + Some(q) =3D> q.send(&STREAM_OPEN, timeout()), + None =3D> dev.bulk_send(EP_CTRL_OUT, &STREAM_OPEN, timeout()).= map(|_| ()), + }; + if let Err(e) =3D arm_res { + pr_err!("vino: CP stream-open marker FAILED ({e:?})\n"); + return Err(e); + } + pr_info!("vino: CP stream-open arm marker sent\n"); + + // No artificial arm->msg0 pad. The shared engine (decompiled mac/= Windows drivers) is + // event-driven and never wall-clock-paces this gap; vino sends ms= g0 ~0.06 ms after the arm + // (vs DLM's ~0.18 ms libusb gap) and the dock's acceptance window= is ms-scale, so the + // sub-ms lead is immaterial -- confirmed not a gate by the firmwa= re-wall verdict. (Was a + // 150 us fsleep copied from DLM's usbmon spacing.) + + // LIVE CP msg0: protocol-fixed header `id=3D0x14 sub=3D0x00 ctr= =3D0x08`, 14 zero bytes, then a + // fresh host-random 10-byte token (the dock does not validate or = echo it), sealed under + // THIS session's ks/riv with a live Dl3Cmac. This is the decisive= engagement probe: a + // `wsub=3D0x45` reply would mean the cipher engaged on a live ses= sion. + let mut content =3D [0u8; 32]; + content[0..2].copy_from_slice(&0x0014u16.to_le_bytes()); // id=3D0= x14 + content[4..8].copy_from_slice(&8u32.to_le_bytes()); // ctr=3D0x08 = (sub=3D0x00 stays zero) + rng::fill(&mut content[22..32]); // host-random token + let body_len =3D content.len() + 16; // AES-CTR ciphertext + 16-by= te Dl3Cmac + let size =3D ((16 + body_len) - 4) as u16; + let aux =3D cp::aux_for_id(0x14, body_len); + let mut hdr =3D [0u8; 16]; + hdr[2..4].copy_from_slice(&size.to_le_bytes()); + hdr[4..8].copy_from_slice(&4u32.to_le_bytes()); // type=3D4 + hdr[8..10].copy_from_slice(&0x24u16.to_le_bytes()); // sub=3D0x24 = (interactive CP) + hdr[10..12].copy_from_slice(&aux.to_le_bytes()); + // hdr[12..16] =3D wire_seq =3D 0 (first CP block) + let frame =3D cp::seal_livemac(&session.ks, &session.riv, &hdr, &c= ontent)?; + + let mut ok =3D false; + if let Some(q) =3D out_q.as_mut() { + // Async path: submit msg0 right behind the still-in-flight ar= m (pipelined burst), + // then drain EP84 while the HCD auto-retries any NAK against = the live URB. Reap both + // OUT transfers; a flush timeout just means the dock NAK'd ms= g0 (URB killed at drop). + match q.send(&frame, timeout()) { + Ok(()) =3D> { + ok =3D true; + pr_info!("vino: live CP msg0 submitted async (pipeline= d behind arm)\n"); + } + Err(e) =3D> pr_info!("vino: live CP msg0 async submit fail= ed ({e:?})\n"), + } + for _ in 0..8 { + let (d, a) =3D Self::drain_ep84(dev, ep84_q.as_mut(), &mut= resp, session, edid_out); + drained +=3D d; + acks +=3D a; + } + match q.flush(Delta::from_millis(200)) { + Ok(()) =3D> pr_info!("vino: async arm+msg0 reaped OK (both= transfers completed)\n"), + Err(e) =3D> pr_info!("vino: async arm+msg0 reap incomplete= ({e:?}) -- dock NAK'd\n"), + } + } else { + // Sync path: single-packet msg0 =3D> a NAK transfers nothing,= so cancel+retry is safe. + // Between attempts drain EP84 so the dock can push/drain its = IN queue. Bounded. + const TRIES: usize =3D 40; + for t in 0..TRIES { + match dev.bulk_send(EP_CTRL_OUT, &frame, Delta::from_milli= s(5)) { + Ok(_) =3D> { + ok =3D true; + pr_info!("vino: live CP msg0 ACCEPTED after {t} in= terleaved tries\n"); + break; + } + // OUT NAK'd (nothing transferred) -- let the dock pus= h on EP84, then retry. + Err(_) =3D> { + let (d, a) =3D + Self::drain_ep84(dev, ep84_q.as_mut(), &mut re= sp, session, edid_out); + drained +=3D d; + acks +=3D a; + } + } + } + } + if ok { + sent +=3D 1; + pr_info!("vino: live CP msg0 sent (id=3D0x14 ctr=3D8, random t= oken, live seal)\n"); + } else { + pr_info!("vino: live CP msg0 still NAK'd (no transfer accepted= )\n"); + } + + // DLM sends the `0x24 wValue=3D0` render/commit vendor request ri= ght after msg0. + match dev.control_send(0x24, 0x40 /* VENDOR_OUT */, 0, 0, &[], tim= eout()) { + Ok(()) =3D> pr_info!("vino: post-msg0 0x24(wValue=3D0) OK\n"), + Err(e) =3D> pr_info!("vino: post-msg0 0x24(wValue=3D0) non-fat= al ({e:?})\n"), + } + // DLM then re-reads the 0x22 vendor state (0xc1, wValue=3D1, wInd= ex=3D0, 28 B) -- its SECOND + // 0x22 of the session, immediately after the post-msg0 0x24. vino= issued the first 0x22 + // pre-arm but stopped here, leaving "DLM-ONLY 0x22" in the paired= diff. Issue it + // unconditionally so the wire matches DLM regardless of whether t= he dock acks; it is a + // harmless vendor IN read. (0xc1 =3D IN|vendor|INTERFACE recipien= t, matching the first 0x22.) + let mut state2 =3D [0u8; 28]; + match dev.control_recv(0x22, 0xc1, 1, 0, &mut state2, timeout()) { + Ok(()) =3D> pr_info!("vino: post-msg0 0x22(wValue=3D1) OK =3D = {:02x?}\n", state2), + Err(e) =3D> pr_info!("vino: post-msg0 0x22(wValue=3D1) non-fat= al ({e:?})\n"), + } + + // Read the dock's reply: a `wsub=3D0x45` ack means the cipher eng= aged on our live frame. + let (d, a, _m) =3D Self::lockstep_reply(dev, ep84_q.as_mut(), &mut= resp, session, 0x08, edid_out); + drained +=3D d; + acks +=3D a; + + const MAX_ROUNDS: usize =3D 16; + for _ in 0..MAX_ROUNDS { + let (d, a) =3D Self::drain_ep84(dev, ep84_q.as_mut(), &mut res= p, session, edid_out); + drained +=3D d; + acks +=3D a; + if d =3D=3D 0 { + break; + } + } + + // ---- Post-engagement live setup (CP-HANDSHAKE.md sec 4f/sec 4e)= ------------------------ + // Only meaningful once the dock has acked msg0: ask the dock for = the downstream EDID, + // then build the mode-set from its preferred timing and send that= -- the live path that + // replaces the static 1080p modeset and the opportunistic-only ED= ID capture. On a cold + // dock `acks` stays 0 (the wall), so this does not run on current= hardware; it completes + // the standalone live-generation flow for when the engagement gat= e is solved. + // The next free AES-CTR block index past this setup, handed to th= e DRM device so runtime + // KMS sends (mode-set/cursor) continue the same keystream. Defaul= ts to msg0's end (2) when + // the live block below doesn't run (no acks) -- irrelevant then, = since we only publish the + // session when `acks > 0`. + let mut wire_seq_end =3D 2u32; + if acks > 0 { + // `wseq` continues the AES-CTR block counter past msg0 (32 B = content =3D 2 blocks); + // the inner `counter` continues past msg0's ctr=3D8. The dock= echoes both, so the + // exact values only need to stay monotonic / non-overlapping = for the keystream. + let mut wseq =3D 2u32; + + // (1) Live get-EDID request -> the dock replies id=3D0x194; `= drain_ep84` (called inside + // `send_live_cp`) decodes it and fills `edid_out` via `parse_= edid_from_reply`. + if let Ok(req) =3D cp::get_edid_req(9) { + match Self::send_live_cp( + dev, session, ep84_q.as_mut(), &mut resp, edid_out, 0x= 15, wseq, &req, + ) { + Ok((ok, d, a)) =3D> { + drained +=3D d; + acks +=3D a; + wseq =3D wseq.wrapping_add(((req.len() + 15) / 16)= as u32); + pr_info!("vino: live get-EDID request {}\n", + if ok { "sent (id=3D0x15 sub=3D0x21)" } else {= "NAK'd" }); + } + Err(e) =3D> pr_info!("vino: live get-EDID request fail= ed ({e:?})\n"), + } + } + + // (2) Dynamic mode-set from the dock's EDID preferred detaile= d timing, falling back to + // the known-good UHD_60 timing when no EDID/DTD is available. + let from_edid =3D edid_out.is_some(); + let timing =3D edid_out + .as_deref() + .and_then(cp::timing_from_edid) + .unwrap_or(cp::Timing::UHD_60); + match cp::set_mode(10, &timing) { + Ok(smode) =3D> { + // `set_mode` reserves a trailing 16-byte tag region; = `seal_livemac` appends a + // fresh live Dl3Cmac, so hand it the inner content wi= thout that region. + let content =3D &smode[..smode.len().saturating_sub(16= )]; + match Self::send_live_cp( + dev, session, ep84_q.as_mut(), &mut resp, edid_out= , 0x48, wseq, content, + ) { + Ok((ok, d, a)) =3D> { + drained +=3D d; + acks +=3D a; + pr_info!("vino: live mode-set {} ({}x{}@{} fro= m {})\n", + if ok { "sent" } else { "NAK'd" }, + timing.hactive, timing.vactive, timing.ref= resh_hz, + if from_edid { "EDID" } else { "fallback" = }); + } + Err(e) =3D> pr_info!("vino: live mode-set failed (= {e:?})\n"), + } + // Advance the keystream past this mode-set so runtime= KMS sends continue it. + wseq =3D wseq.wrapping_add(((content.len() + 15) / 16)= as u32); + } + Err(e) =3D> pr_info!("vino: mode-set build failed ({e:?})\= n"), + } + wire_seq_end =3D wseq; + } + + let engaged =3D if acks > 0 { "dock engaged" } else { "dock ignori= ng our CP (the wall)" }; + pr_info!("vino: CP setup sent=3D{sent} EP84_resp=3D{drained} sub= =3D0x45_acks=3D{acks} ({engaged})\n"); + // Inner counter past the bring-up CP messages (msg0=3D8, get-EDID= =3D9, mode-set=3D10). + Ok((sent, acks, wire_seq_end, 11)) + } + + + /// Seal `content` (inner CP plaintext, WITHOUT the 16-byte tag region= ) into a live + /// `type=3D4 sub=3D0x24` frame at `wire_seq`, send it on EP02 with EP= 84 drained between NAK + /// retries (the single-packet interleave discipline msg0 uses), then = drain once more to + /// collect the dock's reply. `id` selects the DLM-exact `aux` header = field + /// ([`cp::aux_for_id`]). Returns `(sent_ok, ep84_reads, sub=3D0x45_ac= ks)`. Used for the + /// post-engagement live messages (get-EDID, mode-set) once the dock h= as acked msg0. + fn send_live_cp( + dev: &usb::Device, + session: &Session, + mut q: Option<&mut usb::BulkInQueue>, + resp: &mut [u8], + edid_out: &mut Option>, + id: u16, + wire_seq: u32, + content: &[u8], + ) -> Result<(bool, usize, usize)> { + let frame =3D cp::seal_interactive(&session.ks, &session.riv, id, = wire_seq, content)?; + + // Single-packet OUT: a NAK transfers nothing, so cancel+retry is = safe. Between attempts + // drain EP84 so the dock can push/drain its IN queue (matches msg= 0's behaviour). + const TRIES: usize =3D 40; + let mut ok =3D false; + let mut drained =3D 0usize; + let mut acks =3D 0usize; + for _ in 0..TRIES { + match dev.bulk_send(EP_CTRL_OUT, &frame, Delta::from_millis(5)= ) { + Ok(_) =3D> { + ok =3D true; + break; + } + Err(_) =3D> { + let (d, a) =3D Self::drain_ep84(dev, q.as_deref_mut(),= resp, session, edid_out); + drained +=3D d; + acks +=3D a; + } + } + } + // Collect the dock's reply (the get-EDID id=3D0x194 frame is capt= ured here via drain_ep84). + let (d, a) =3D Self::drain_ep84(dev, q.as_deref_mut(), resp, sessi= on, edid_out); + drained +=3D d; + acks +=3D a; + Ok((ok, drained, acks)) + } + + + /// sec 5 read-only diagnostic: log one dock->host EP84 frame's wire h= eader + /// (`type`@4, `sub`@8, `aux`@10, `seq`@12) and, when the body decrypt= s under the IN + /// keystream, its inner `(id, sub, ictr)`. Surfaces EVERY frame the d= ock returns -- + /// not just `sub=3D0x45` -- so a hardware run reveals whether the doc= k is mute, NAKing, + /// or replying with an unexpected sub. Pure logging; no state change. + fn log_ep84(session: &Session, frame: &[u8]) { + let len =3D frame.len(); + let wtype =3D if len >=3D 8 { + u32::from_le_bytes([frame[4], frame[5], frame[6], frame[7]]) + } else { + 0 + }; + let wsub =3D if len >=3D 10 { u16::from_le_bytes([frame[8], frame[= 9]]) } else { 0 }; + let aux =3D if len >=3D 12 { u16::from_le_bytes([frame[10], frame[= 11]]) } else { 0 }; + let wseq =3D if len >=3D 16 { + u32::from_le_bytes([frame[12], frame[13], frame[14], frame[15]= ]) + } else { + 0 + }; + { + // Dev diagnostic (pr_debug, compiled out unless dynamic debug= is enabled): the raw + // wire, so the dock's pushes can be offline-decoded. The dock= 's large capability block + // (~5787 B) must be dumped in 128-byte CHUNKS, because a sing= le hex print of a + // >~250-byte + // array exceeds printk's per-line limit. Capped at 768 B (6 l= ines) to avoid flooding. + let cap =3D len.min(768); + if cap <=3D 64 { + let raw =3D &frame[..cap]; + pr_debug!("vino: dock EP84 RAW {len}B {raw:02x?}\n"); + } else { + pr_debug!("vino: dock EP84 RAW {len}B (first {cap} B in 12= 8-B chunks):\n"); + let mut o =3D 0usize; + while o < cap { + let e =3D (o + 128).min(cap); + let chunk =3D &frame[o..e]; + pr_debug!("vino: ep84[{o:#06x}] {chunk:02x?}\n"); + o =3D e; + } + } + } + match cp::decode_any(&session.ks, &session.riv, frame) { + Some((rivtag, rid, rsub, rictr, sample)) =3D> { + pr_info!( + "vino: dock EP84 type=3D{wtype} wsub=3D{wsub:#x} aux= =3D{aux:#x} seq=3D{wseq:#x} {len}B -> [{rivtag}] id=3D{rid:#x} sub=3D{rsub:= #x} ictr=3D{rictr:#x} pt=3D{sample:02x?}\n" + ); + } + None =3D> { + pr_info!( + "vino: dock EP84 type=3D{wtype} wsub=3D{wsub:#x} aux= =3D{aux:#x} seq=3D{wseq:#x} {len}B (no inner decode)\n" + ); + } + } + } + + /// Read one EP84 frame: from the persistent async queue `q` when [`CP= _ASYNC_EP84`] has opened + /// one, else a synchronous `bulk_recv`. The queue's timeout (`Ok(None= )`) is mapped to + /// `Err(ETIMEDOUT)` so the callers' existing match arms (which treat = any `Err`/empty as + /// "no more data right now") work unchanged across both paths. + fn read_ep84( + dev: &usb::Device, + q: Option<&mut usb::BulkInQueue>, + buf: &mut [u8], + to: Delta, + ) -> Result { + match q { + Some(queue) =3D> match queue.recv(buf, to) { + Ok(Some(n)) =3D> Ok(n), + Ok(None) =3D> Err(ETIMEDOUT), + Err(e) =3D> Err(e), + }, + None =3D> dev.bulk_recv(EP_CTRL_IN, buf, to), + } + } + + + fn drain_ep84( + dev: &usb::Device, + mut q: Option<&mut usb::BulkInQueue>, + buf: &mut [u8], + session: &Session, + edid_out: &mut Option>, + ) -> (usize, usize) { + const MAX_READS: usize =3D 16; + let mut n =3D 0usize; + let mut acks =3D 0usize; + // Read EP84 FIRST (the dock answers in ~0.14 ms, same as it does = for DLM). The EP83 status + // poll is serviced AFTER -- polling it before the EP84 read block= ed the critical path for + // up + // to 30 ms PER cap frame (timeline diff 2026-06-11: vino's cap ph= ase was 446 ms / ~32 ms + // per + // frame vs DLM's 60 ms / 0.14 ms, purely from this ordering), arm= ing the dock ~1 s late. + for _ in 0..MAX_READS { + match Self::read_ep84(dev, q.as_deref_mut(), buf, Delta::from_= millis(10)) { + Ok(len) if len > 0 =3D> { + n +=3D 1; + // sec 5 diagnostic: surface EVERY dock->host frame, n= ot just `sub=3D0x45`, + // so a hardware run shows what the dock actually retu= rns (a different + // sub, a NAK, or plaintext) instead of a bare `EP84_r= esp=3DN` count. + Self::log_ep84(session, &buf[..len]); + if len >=3D 10 && u16::from_le_bytes([buf[8], buf[9]])= =3D=3D 0x45 { + acks +=3D 1; + // Capture the dock's EDID the first time it appea= rs (id=3D0x94 + // sub=3D0x21 reply to the replayed get-EDID reque= st). Reuses the + // standard DRM EDID infra in get_modes. See CONTR= OL-PLANE.md. + if edid_out.is_none() { + if let Ok(Some(e)) =3D + cp::parse_edid_from_reply(&session.ks, &se= ssion.riv, &buf[..len]) + { + pr_info!("vino: EDID read from dock ({} by= tes)\n", e.len()); + *edid_out =3D Some(e); + } + } + } + } + _ =3D> break, + } + } + // Service EP83 AFTER draining EP84, so it never delays reading th= e dock's CP reply. + if Self::POLL_EP83_DURING_BRINGUP { + Self::poll_ep83(dev); + } + (n, acks) + } + + + /// Lockstep counterpart to [`drain_ep84`]: after one CP OUT, drain EP= 84 until the + /// `sub=3D0x45` reply whose **inner counter echoes** `ictr` arrives (= DLM's 1:1 + /// handshake) or the short read budget elapses. Any async + /// pushes seen meanwhile are still counted and scanned for the EDID. = Returns + /// `(reads, acks, matched)`. + fn lockstep_reply( + dev: &usb::Device, + mut q: Option<&mut usb::BulkInQueue>, + buf: &mut [u8], + session: &Session, + ictr: u16, + edid_out: &mut Option>, + ) -> (usize, usize, bool) { + const MAX_READS: usize =3D 8; + let in_riv =3D cp::in_riv(&session.riv); + let mut reads =3D 0usize; + let mut acks =3D 0usize; + let mut matched =3D false; + for _ in 0..MAX_READS { + match Self::read_ep84(dev, q.as_deref_mut(), buf, Delta::from_= millis(30)) { + Ok(len) if len > 16 =3D> { + reads +=3D 1; + // sec 5 diagnostic: log every frame the dock returns = in the lockstep + // window -- including the non-`0x45` frames we otherw= ise skip -- so the + // divergence point is paired with the dock's actual r= eply on the wire. + Self::log_ep84(session, &buf[..len]); + if u16::from_le_bytes([buf[8], buf[9]]) !=3D 0x45 { + continue; + } + acks +=3D 1; + let seq =3D u32::from_le_bytes([buf[12], buf[13], buf[= 14], buf[15]]); 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Wed, 17 Jun 2026 08:13:02 -0700 (PDT) Received: from axion.fireburn.co.uk ([137.220.119.72]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49230a9a399sm151019305e9.14.2026.06.17.08.13.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Jun 2026 08:13:02 -0700 (PDT) From: Mike Lothian To: dri-devel@lists.freedesktop.org Cc: Mike Lothian , rust-for-linux@vger.kernel.org, Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Miguel Ojeda , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , linux-kernel@vger.kernel.org Subject: [RFC PATCH 4/7] drm/vino: add the Vino (RawRl mode-2) framebuffer codec Date: Wed, 17 Jun 2026 16:12:41 +0100 Message-ID: <20260617151249.2937-5-mike@fireburn.co.uk> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260617151249.2937-1-mike@fireburn.co.uk> References: <20260617151249.2937-1-mike@fireburn.co.uk> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add the video module: the RawRl ("Raw/RLX" mode-2) encoder, clean-room from the AArch64 reference-driver decompile, which emits packed-RGB565 frames the dock decodes without the impractical Vino Walsh-Hadamard entropy codec. The encode/decode round-trip is unit-tested (keyframe, differential, >256-pixel multi-block and >255 RLE run-splits all reconstruct byte-exact); that round-trip is the correctness anchor, since no real mode-2 capture exists to diff against. This is the codec library only; the DRM/KMS sink that drives it (vmap the framebuffer, encode, push to the EP08 video endpoint on each page-flip) is added in the next patch. Signed-off-by: Mike Lothian Assisted-by: Claude:claude-opus-4-8 [Claude-Code] --- drivers/gpu/drm/vino/video.rs | 348 ++++++++++++++++++++++++++++++++++ drivers/gpu/drm/vino/vino.rs | 1 + 2 files changed, 349 insertions(+) create mode 100644 drivers/gpu/drm/vino/video.rs diff --git a/drivers/gpu/drm/vino/video.rs b/drivers/gpu/drm/vino/video.rs new file mode 100644 index 000000000000..bb5ea893575f --- /dev/null +++ b/drivers/gpu/drm/vino/video.rs @@ -0,0 +1,348 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! RawRl (Raw/RLX) **mode-2 video encoder** -- clean-room from the AArch6= 4 DLM +//! decompile (sec 8.4 + `docs/decompile/arm64-blockencoder`/`-frame-marke= rs`). +//! Emits packed-RGB565 frames the dock decodes WITHOUT the impractical Vi= no +//! Walsh-Hadamard entropy codec (sec 7.11). This is a **verbatim port** o= f the +//! `vino-codec::rawrl` oracle, whose encode/decode round-trip is unit-tes= ted +//! (keyframe, differential, >256-pixel multi-block and >255 RLE run-split= s all +//! reconstruct byte-exact); keep the two in lockstep. No real mode-2 capt= ure +//! exists to diff against (sec 7.4), so that round-trip is the correctnes= s anchor. +//! NOT yet wired into `probe()`: sending a frame the dock rejects USB-res= ets the +//! dock, so EP08 streaming is a supervised bring-up step. +#![allow(dead_code)] // Encoder/Mode variants validated by KUnit; live sca= nout uses the RLE path + +use super::*; + +pub(super) const MAGIC_RAW16: u16 =3D 0x68af; +pub(super) const MAGIC_RLE16: u16 =3D 0x69af; +/// Frame-init `0x40af` (`FUN_003330fc`: u32 `0xaf0440af` + u16 `0x0840`). +pub(super) const FRAME_INIT: [u8; 6] =3D [0xaf, 0x40, 0x04, 0xaf, 0x40, 0x= 08]; +/// Bare `0xa0af` sync (`FUN_00332a38`). +pub(super) const SYNC: [u8; 2] =3D [0xaf, 0xa0]; +/// Frame-end section->code table `DAT_005b7860`, indexed by `mode - 1`. +pub(super) const SECTION_CODE: [u8; 7] =3D [0x01, 0x00, 0x03, 0x00, 0x05, = 0x07, 0x07]; +pub(super) const MAX_BLOCK_PIXELS: usize =3D 256; + +/// Per-run strategy: mode 0 raw-only, 1 RLE-only, 2 adaptive (sec 8.4). +#[derive(Clone, Copy)] +pub(super) enum Mode { + Raw =3D 0, + Rle =3D 1, + Adaptive =3D 2, +} + +/// Pack 8-bit RGB into RGB565 (the XRGB framebuffer reduced for the +/// `0x68af`/`0x69af` path). +pub(super) fn rgb565(r: u8, g: u8, b: u8) -> u16 { + ((r as u16 >> 3) << 11) | ((g as u16 >> 2) << 5) | (b as u16 >> 3) +} + +/// 6-byte block header: magic LE, 24-bit coord BE, count u8 (256 -> 0). +fn block_header(out: &mut KVec, magic: u16, coord: u32, count: usize) = -> Result { + out.extend_from_slice(&magic.to_le_bytes(), GFP_KERNEL)?; + out.push(((coord >> 16) & 0xff) as u8, GFP_KERNEL)?; + out.push(((coord >> 8) & 0xff) as u8, GFP_KERNEL)?; + out.push((coord & 0xff) as u8, GFP_KERNEL)?; + out.push((count & 0xff) as u8, GFP_KERNEL)?; + Ok(()) +} + +fn encode_raw_into(out: &mut KVec, coord: u32, pix: &[u16]) -> Result { + block_header(out, MAGIC_RAW16, coord, pix.len())?; + for &p in pix { + out.extend_from_slice(&p.to_be_bytes(), GFP_KERNEL)?; + } + Ok(()) +} + +fn encode_rle_into(out: &mut KVec, coord: u32, pix: &[u16]) -> Result { + block_header(out, MAGIC_RLE16, coord, pix.len())?; + let mut i =3D 0; + while i < pix.len() { + let v =3D pix[i]; + let mut run =3D 1; + while i + run < pix.len() && pix[i + run] =3D=3D v && run < 255 { + run +=3D 1; + } + out.push(run as u8, GFP_KERNEL)?; + out.extend_from_slice(&v.to_be_bytes(), GFP_KERNEL)?; + i +=3D run; + } + Ok(()) +} + +fn run_count(pix: &[u16]) -> usize { + let mut c =3D 0; + let mut i =3D 0; + while i < pix.len() { + let v =3D pix[i]; + let mut j =3D i + 1; + while j < pix.len() && pix[j] =3D=3D v { + j +=3D 1; + } + c +=3D 1; + i =3D j; + } + c +} + +fn encode_run_into(out: &mut KVec, mode: Mode, coord: u32, pix: &[u16]= ) -> Result { + match mode { + Mode::Raw =3D> encode_raw_into(out, coord, pix), + Mode::Rle =3D> encode_rle_into(out, coord, pix), + Mode::Adaptive =3D> { + let l =3D pix.len(); + let c =3D run_count(pix); + if 2 * l < 3 * c + 1 { + encode_raw_into(out, coord, pix) + } else { + encode_rle_into(out, coord, pix) + } + } + } +} + +/// Mode-2 frame encoder holding the shadow (previous-frame) buffer. +pub(super) struct Encoder { + width: usize, + height: usize, + mode: Mode, + // vmalloc-backed: a `width*height` u16 buffer is ~4 MiB at 1080p, far= above the + // contiguous-kmalloc order limit (the page allocator WARNs and fails = on it). + shadow: VVec, +} + +impl Encoder { + pub(super) fn new(width: usize, height: usize, mode: Mode) -> Result { + let shadow =3D VVec::from_elem(0u16, width * height, GFP_KERNEL)?; + Ok(Self { width, height, mode, shadow }) + } + + /// Encode `cur` (RGB565) into a mode-2 marker stream; updates the sha= dow. + /// Change-detection is per row; changed runs chunk into <=3D256-px bl= ocks. + pub(super) fn encode(&mut self, cur: &[u16]) -> Result> { + let mut s =3D KVec::new(); + self.encode_into(cur, &mut s)?; + Ok(s) + } + + /// Like [`encode`](Self::encode) but appends the marker stream to a c= aller-owned + /// `out` instead of allocating a fresh `KVec`. The hot scanout path + /// ([`encode_and_send`](super::drm_sink::encode_and_send)) uses this = to encode + /// straight into a buffer that already reserves the EP08 transport he= ader, so a + /// frame costs one allocation with no separate framing copy. + pub(super) fn encode_into(&mut self, cur: &[u16], s: &mut KVec) ->= Result { + s.extend_from_slice(&FRAME_INIT, GFP_KERNEL)?; + for y in 0..self.height { + let row =3D y * self.width; + let mut x =3D 0; + while x < self.width { + while x < self.width && cur[row + x] =3D=3D self.shadow[ro= w + x] { + x +=3D 1; + } + if x >=3D self.width { + break; + } + let run_start =3D x; + while x < self.width && cur[row + x] !=3D self.shadow[row = + x] { + x +=3D 1; + } + let run_end =3D x; + let mut p =3D run_start; + while p < run_end { + let n =3D (run_end - p).min(MAX_BLOCK_PIXELS); + let coord =3D (((row + p) * 2) & 0xff_ffff) as u32; + encode_run_into(s, self.mode, coord, &cur[row + p..row= + p + n])?; + p +=3D n; + } + for k in run_start..run_end { + self.shadow[row + k] =3D cur[row + k]; + } + } + } + let code =3D SECTION_CODE[(self.mode as usize).saturating_sub(1).m= in(6)]; + s.extend_from_slice(&SYNC, GFP_KERNEL)?; + s.extend_from_slice(&[0xaf, 0x20, 0x1f, code], GFP_KERNEL)?; + s.extend_from_slice(&[0xaf, 0x20, 0xff, 0x00], GFP_KERNEL)?; + s.extend_from_slice(&SYNC, GFP_KERNEL)?; + Ok(()) + } +} + +/// Vino (`0x2801`) Walsh-Hadamard codec -- the bandwidth-constrained / 4K= path (the RLE path +/// above is what the dock currently runs; this is the lossy transform cod= ec DLM uses when raw/ +/// RLE won't fit the USB budget). See `docs/WHT-CODEC.md` + `docs/VIDEO.m= d`. +/// +/// **Scope.** The colour transform, the quantizer, and the 2-level Walsh-= Hadamard transform +/// are reverse-engineered and **validated offline** (`white -> Y_DC=3D163= 20 -> quantized 1020`; +/// achromatic -> `Cb=3DCr=3D0`; uniform block -> DC=3Dmean, AC=3D0). The = token *bit format* (5-bit +/// short +/// 0..=3D30 / 17-bit long, MSB-first) and the **token-value mapping** are= confirmed against DLM's +/// own frida token trace (`captures/02-solid-white/tokens.jsonl`): the **= token value is the +/// quantized coefficient, directly** -- pure-white strips emit `L,1020` e= xactly where +/// `quantize(16320, DC) =3D 1020`, so the rumoured "entropy codebook" is = just this direct value +/// encoding, not a lookup table (the 1641-byte expression-tree coder is t= he bit-packer). **What +/// is still NOT generated here:** the per-strip *framing* -- a uniform st= rip wraps the DC in a +/// constant prefix/suffix of framing tokens (`L,2048 L,3072 ... L,3 ... S= ,19 S,16 ...`) plus +/// zero-run +/// AC coding, and the dock's exact sequency ordering -- so a complete `Mo= de::Wht` would replay +/// the recovered uniform-strip template with the DC substituted (the `doc= s/WHT-CODEC.md` +/// structural model, ~90% desktop coverage). Until that framing is genera= lized + wired, the +/// scanout path keeps using RLE. +// Not yet wired into the scanout path (the per-strip framing template is = recovered for white +// but not yet generalized to arbitrary uniform colour / non-uniform conte= nt) -- RLE stays the +// active codec; this module is validated by its KUnit tests + the frida-t= race value mapping. +#[allow(dead_code)] // Walsh-Hadamard codec: KUnit-validated, not yet on t= he live scanout path +pub(super) mod wht { + use super::*; + + /// 4x8 transform block geometry (`docs/VIDEO.md`): 4 rows x 8 columns= =3D 32 samples. + pub(super) const ROWS: usize =3D 4; + pub(super) const COLS: usize =3D 8; + pub(super) const BLOCK: usize =3D ROWS * COLS; + + /// Vino colour transform (`docs/VIDEO.md`, exact integer form, no rou= nding): + /// `Y =3D 16R + 32G + 16B`, `Cb =3D 64(R-G)`, `Cr =3D 64(B-G)`. Achro= matic (R=3DG=3DB) -> + /// Cb=3DCr=3D0. + pub(super) fn colour(r: u8, g: u8, b: u8) -> (i32, i32, i32) { + let (r, g, b) =3D (r as i32, g as i32, b as i32); + (16 * r + 32 * g + 16 * b, 64 * (r - g), 64 * (b - g)) + } + + /// Per-coefficient `(bias, step)` quantization table (`docs/VIDEO.md`= `FUN_0077b140`), + /// keyed by coefficient position `0..64`. + fn bias_step(i: usize) -> (i32, i32) { + match i { + 0..=3D2 =3D> (8, 16), + 3 =3D> (16, 32), + 4..=3D11 =3D> (2, 4), + 12..=3D15 =3D> (4, 8), + 16..=3D47 =3D> (1, 2), + _ =3D> (2, 4), // 48..=3D63 + } + } + + /// Quantize coefficient `coeff` at position `i`: `(coeff + bias) * (6= 5536/step) >> 16`, + /// the fixed-point form of `(coeff + bias) / step` (`docs/VIDEO.md`).= Clamped to the + /// 12-bit signed long-token range (the DC is wider than the +/-127 AC= clip -- the + /// documented + /// `white -> 1020` vector is a 12-bit long token, not a +/-127 value). + pub(super) fn quantize(coeff: i32, i: usize) -> i32 { + let (bias, step) =3D bias_step(i); + let scale =3D 65536 / step; + (((coeff + bias) * scale) >> 16).clamp(-2048, 2047) + } + + /// In-place 1-D Walsh-Hadamard (natural/Hadamard order) on a power-of= -two slice, + /// unnormalized (pairwise sums/differences); the 2-D transform normal= izes afterwards. + fn hadamard_1d(v: &mut [i32]) { + let n =3D v.len(); + let mut h =3D 1; + while h < n { + let mut i =3D 0; + while i < n { + for j in i..i + h { + let (a, b) =3D (v[j], v[j + h]); + v[j] =3D a + b; + v[j + h] =3D a - b; + } + i +=3D 2 * h; + } + h *=3D 2; + } + } + + /// 2-level separable Walsh-Hadamard transform of a 4x8 `block` (row-m= ajor), normalized so + /// the DC coefficient equals the block **mean** -- i.e. a uniform blo= ck yields `DC =3D the + /// per-pixel value` and all AC =3D 0 (`docs/VIDEO.md`). Returns 32 co= efficients row-major. + /// (Natural Hadamard order; the dock's sequency reorder is not bit-ma= tched -- see the + /// module note.) + pub(super) fn transform(block: &[i32; BLOCK]) -> [i32; BLOCK] { + let mut m =3D *block; + for r in 0..ROWS { + hadamard_1d(&mut m[r * COLS..r * COLS + COLS]); + } + let mut col =3D [0i32; ROWS]; + for c in 0..COLS { + for r in 0..ROWS { + col[r] =3D m[r * COLS + c]; + } + hadamard_1d(&mut col); + for r in 0..ROWS { + m[r * COLS + c] =3D col[r]; + } + } + // Normalize by the block size (/32 =3D >>5) so DC =3D mean (unifo= rm block -> DC =3D value). + for x in m.iter_mut() { + *x >>=3D 5; + } + m + } + + /// MSB-first bit packer for the Vino token stream (`docs/VIDEO.md`): = a 16-bit zero pad at + /// the start, then codewords packed most-significant-bit first across= byte boundaries. + pub(super) struct TokenWriter { + out: KVec, + acc: u32, + nbits: u32, + } + + impl TokenWriter { + pub(super) fn new() -> Result { + let mut w =3D Self { out: KVec::new(), acc: 0, nbits: 0 }; + w.put(0, 16)?; // 16-bit zero pad at stream start + Ok(w) + } + + /// Append the low `n` bits of `val` (n <=3D 24), MSB-first. + fn put(&mut self, val: u32, n: u32) -> Result { + self.acc =3D (self.acc << n) | (val & ((1u32 << n) - 1)); + self.nbits +=3D n; + while self.nbits >=3D 8 { + self.nbits -=3D 8; + self.out.push(((self.acc >> self.nbits) & 0xff) as u8, GFP= _KERNEL)?; + } + Ok(()) + } + + /// Write one token *value* in the Vino short/long encoding: a 5-b= it short token for + /// `0..=3D30`, else the 17-bit long token `0b11111` escape + 12-b= it value. (The mapping + /// from a quantized coefficient to this `value` is the un-RE'd en= tropy codebook -- see + /// the module note -- so callers can only pack values they alread= y know.) + pub(super) fn token(&mut self, value: u16) -> Result { + if value <=3D 30 { + self.put(value as u32, 5) + } else { + self.put(0b11111, 5)?; + self.put((value & 0x0fff) as u32, 12) + } + } + + /// Flush any partial byte (zero-padded) and return the packed str= eam. + pub(super) fn finish(mut self) -> Result> { + if self.nbits > 0 { + let pad =3D 8 - self.nbits; + self.put(0, pad)?; + } + Ok(self.out) + } + } +} + +/// Length of the EP08 transport header ([`write_ep08_header`]). +pub(super) const EP08_HDR_LEN: usize =3D 16; + +/// Write the 16-byte EP08 transport header into `hdr` for a `payload_len`= -byte codec +/// stream: `type=3D4 sub=3D0x30 sub_len_dw=3D0` sec 3 framing (matches th= e live capture). +/// `size =3D payload_len + 12`. Used by the in-place scanout path. `hdr` = must be at +/// least 16 bytes. +pub(super) fn write_ep08_header(hdr: &mut [u8], payload_len: usize, seq: u= 32) { + hdr[0] =3D 0; + hdr[1] =3D 0; + hdr[2..4].copy_from_slice(&((payload_len + 12) as u16).to_le_bytes()); + hdr[4..8].copy_from_slice(&4u32.to_le_bytes()); + hdr[8..10].copy_from_slice(&0x30u16.to_le_bytes()); + hdr[10..12].copy_from_slice(&0u16.to_le_bytes()); + hdr[12..16].copy_from_slice(&seq.to_le_bytes()); +} diff --git a/drivers/gpu/drm/vino/vino.rs b/drivers/gpu/drm/vino/vino.rs index ef44a625cb70..e9e6324b717b 100644 --- a/drivers/gpu/drm/vino/vino.rs +++ b/drivers/gpu/drm/vino/vino.rs @@ -86,6 +86,7 @@ fn timeout() -> Delta { mod ake; mod golden; mod cp; +mod video; =20 /// The shared secrets a completed HDCP 2.2 AKE leaves behind: the SKE ses= sion key /// `ks` and content IV `riv` key the AES-CTR control plane (sec 6), and `= kd` is kept --=20 2.54.0 From nobody Thu Nov 5 07:36:10 2026 Received: from mail-wm1-f47.google.com (mail-wm1-f47.google.com [209.85.128.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1358E3C1967 for ; 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Wed, 17 Jun 2026 08:13:04 -0700 (PDT) Received: from axion.fireburn.co.uk ([137.220.119.72]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49230a9a399sm151019305e9.14.2026.06.17.08.13.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Jun 2026 08:13:03 -0700 (PDT) From: Mike Lothian To: dri-devel@lists.freedesktop.org Cc: Mike Lothian , rust-for-linux@vger.kernel.org, Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Miguel Ojeda , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , linux-kernel@vger.kernel.org Subject: [RFC PATCH 5/7] drm/vino: register a DRM/KMS device and scan out to EP08 Date: Wed, 17 Jun 2026 16:12:42 +0100 Message-ID: <20260617151249.2937-6-mike@fireburn.co.uk> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260617151249.2937-1-mike@fireburn.co.uk> References: <20260617151249.2937-1-mike@fireburn.co.uk> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add the drm_sink module: register a real struct drm_device with a hand-rolled atomic mode-setting pipeline so the dock appears to userspace as a mode-settable card/renderD node -- one CRTC driven by a primary plane and a cursor plane, a virtual encoder, and a virtual connector whose mode list comes from the dock's real EDID (falling back to 1080p), with GEM-shmem dumb buffers and drm_gem_fb_create framebuffers. probe() now allocates and registers the DRM device on the control interface; the bring-up work item caches the dock EDID on it and, once (if) the CP engages, publishes the live session so the KMS callbacks can emit runtime CP (mode-set on a modeset, cursor on motion). On every page-flip the primary plane's update vmaps the framebuffer, encodes it with the Vino codec and pushes it to the EP08 video endpoint, gated on CP_ENGAGED so frames are only sent once the dock's cipher is live. Signed-off-by: Mike Lothian Assisted-by: Claude:claude-opus-4-8 [Claude-Code] --- drivers/gpu/drm/vino/drm_sink.rs | 1333 ++++++++++++++++++++++++++++++ drivers/gpu/drm/vino/vino.rs | 145 +++- 2 files changed, 1458 insertions(+), 20 deletions(-) create mode 100644 drivers/gpu/drm/vino/drm_sink.rs diff --git a/drivers/gpu/drm/vino/drm_sink.rs b/drivers/gpu/drm/vino/drm_si= nk.rs new file mode 100644 index 000000000000..afbf883fba36 --- /dev/null +++ b/drivers/gpu/drm/vino/drm_sink.rs @@ -0,0 +1,1333 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! Phase 3 (DRM/KMS sink): register a real `struct drm_device` with a ful= l atomic +//! mode-setting pipeline so the dock appears to userspace as a `card`/`re= nderD` node +//! that can be `drmModeSetCrtc`'d. A hand-rolled atomic pipeline: one CRT= C driven by a +//! primary plane (`primary_atomic_update` -> EP08 scanout) and a cursor p= lane +//! (`cursor_atomic_update` -> cursor CP), a virtual encoder, and a virtua= l connector whose +//! mode list comes from the dock's real EDID (falling back to 1080p), wit= h GEM-shmem dumb +//! buffers and `drm_gem_fb_create` framebuffers. (Earlier this was `drm_s= imple_display_pipe`, +//! swapped out because that helper is primary-plane-only and can't carry = a cursor plane.) +//! The scanout/cursor writes are gated on the CP-arming blocker (see `doc= s/BLOCKER.md`). The +//! KMS C bindings are pulled in by +//! `patches/drm/0001` (bindings_helper.h headers + the `Driver::FEAT_MODE= SET` / +//! `Driver::FEAT_ATOMIC` flags + a public `Device::as_raw`); see `patches= /README.md`. + +use core::ptr; +use kernel::{ + bindings, drm, + error::{ + code::{EINVAL, ENOMEM}, + to_result, + }, + prelude::*, + sync::{aref::ARef, new_mutex, Mutex}, + types::Opaque, +}; + +/// Fallback connector mode advertised by `get_modes` when the dock has no= t delivered a real +/// downstream EDID yet. The live scanout geometry follows the actual fram= ebuffer/negotiated +/// mode (see `scanout_one`), so this is only the no-EDID default, not a h= ard scanout limit. +const FALLBACK_W: i32 =3D 1920; +const FALLBACK_H: i32 =3D 1080; + +/// The DRM driver marker type. +pub(super) struct VinoDrmDriver; + +/// Convenience alias for our concrete `drm::Device`. +pub(super) type VinoDrmDevice =3D drm::Device; + +/// `DRM_FORMAT_XRGB8888` (`fourcc_code('X','R','2','4')`); the dock scans= out 32bpp. +const DRM_FORMAT_XRGB8888: u32 =3D 0x3432_5258; +/// `DRM_FORMAT_ARGB8888` (`fourcc_code('A','R','2','4')`); the cursor spr= ite carries alpha. +const DRM_FORMAT_ARGB8888: u32 =3D 0x3432_5241; +/// Primary-plane format list (opaque 32bpp scanout). +static PRIMARY_FORMATS: [u32; 1] =3D [DRM_FORMAT_XRGB8888]; +/// Cursor-plane format list (alpha sprite). ARGB8888 little-endian memory= order is +/// `B,G,R,A` per pixel -- already the BGRA byte layout `cp::cursor_image`= wants. +static CURSOR_FORMATS: [u32; 1] =3D [DRM_FORMAT_ARGB8888]; +/// Hardware cursor sprite size (the dock cursor is 64x64; `DRM_CAP_CURSOR= _WIDTH/HEIGHT`). +const CURSOR_SIZE: u32 =3D 64; +/// `GAMMA_LUT` size advertised on the CRTC. 256 entries matches the 8-bit= scanout channels; +/// the LUT is applied host-side in the scanout conversion (see `read_gamm= a_lut`). +const GAMMA_SIZE: u32 =3D 256; + +/// Per-mode pixel-clock ceiling (kHz) for a single head -- about 4K@60 (C= EA 594 MHz). +/// `mode_valid` prunes any single mode above this from a connector's adve= rtised list. +const MAX_HEAD_CLOCK_KHZ: i32 =3D 600_000; +/// Combined pixel-clock budget (kHz) summed over all *active* heads -- th= e dock's DL3 link +/// ceiling. This is a deliberately conservative *raw* pixel-rate proxy (D= isplayLink compresses +/// the stream, so the true USB budget is higher and content-dependent; th= e WHT codec exists for +/// the tight cases). At 1 GHz it admits one 4K@60, 4K@60 + QHD@60, or dua= l-QHD@60, and rejects +/// dual-4K -- matching the D6000's real multi-monitor envelope. Tune to t= aste / per dock +/// model. +const MAX_TOTAL_CLOCK_KHZ: i64 =3D 1_000_000; + +/// Mutable scanout state, guarded because the atomic `update` callback ma= y run +/// concurrently with itself across heads. Holds the stateful Vino encoder= (created +/// lazily on the first flip, once the buffer geometry is known) and the E= P08 frame +/// sequence counter. +pub(super) struct ScanoutState { + enc: Option, + /// Reusable `width*height` RGB565 conversion buffer, allocated once a= longside `enc`. + /// Previously `encode_and_send` did a fresh `KVec::with_capacity(w*h)= ` on every pageflip; + /// at 1080p that is a ~4 MiB *contiguous* kmalloc (order 11), above t= he allocator's limit, + /// so the page allocator WARNed and returned `ENOMEM` every frame. vm= alloc-backed + + /// persistent: virtually-contiguous (no high-order page need) and all= ocated once. + cur: VVec, + seq: u32, + /// Geometry (`width`, `height`) the encoder/`cur` were allocated for.= The scanout follows + /// the live framebuffer size, so a mode switch re-allocates them when= this no longer + /// matches. + dims: (usize, usize), + /// The [`super::cp::Timing`] of the mode the compositor last enabled = on the CRTC, captured + /// in [`crtc_atomic_enable`] via [`super::cp::timing_from_drm_mode`].= This is the + /// multi-mode hook: + /// userspace can pick *any* mode from the EDID-derived list and the c= hosen + /// `drm_display_mode` + /// is recorded here so the live mode-set CP message reflects it (rath= er than always the + /// EDID-preferred timing). The CP send itself is gated on the engagem= ent wall + session + /// plumbing (see the doc note in `crtc_atomic_enable`). + active_timing: Option, + /// Size of the last EP08 frame produced, used to pre-reserve the next= frame's + /// buffer. The encoded stream size is stable frame-to-frame (it track= s the damage + /// area), so seeding `KVec::with_capacity` from it makes the encode g= row the buffer + /// at most once instead of reallocating repeatedly as runs are append= ed. + hint: usize, +} + +/// The live CP session the bring-up work item publishes once the dock eng= ages the cipher +/// (`acks > 0`), so the KMS callbacks can seal+send runtime CP messages -= - a mode-set when the +/// compositor switches mode, a cursor message on pointer motion -- that c= ontinue the SAME +/// keystream the bring-up setup left off at. `wire_seq` is the AES-CTR bl= ock counter (advanced +/// by the content blocks of each send; the appended Dl3Cmac tag is not pa= rt of the keystream) +/// and `counter` the dock-echoed inner CP counter. Both advance per send = under the mutex. +pub(super) struct CpLink { + ks: [u8; 16], + riv: [u8; 8], + wire_seq: u32, + counter: u16, +} + +/// Number of display heads the D6000 dock drives. The protocol routes vid= eo by endpoint +/// (head 0 -> EP 0x08, head 1 -> EP 0x0a; heads 2/3 -> 0x0b/0x0c are docu= mented but their CP +/// riv / EDID-request encoding is unconfirmed, so only 2 heads are wired)= . The DL3 CP stream +/// selects the head via the riv `byte0 ^ 0x80` (head 0 base / head 1 flip= ped). +pub(super) const NHEADS: usize =3D 2; +/// Per-head video bulk-OUT endpoint (`PROTOCOL.md`). Index by [`Head::ind= ex`]. +const HEAD_EP: [u8; NHEADS] =3D [0x08, 0x0a]; + +/// One display head: its own CRTC + primary plane (scanout) + cursor plan= e + encoder + +/// connector, plus per-head scanout state and cached monitor EDID. The vt= ables are shared +/// across heads (in [`VinoDrmData`]); the callbacks recover the head from= the C object +/// pointer. All C objects are zeroed at init and filled by [`kms_init`]. +#[pin_data] +pub(super) struct Head { + /// 0-based head index. Selects the video EP ([`HEAD_EP`]) and the CP = riv (head 1 flips + /// the riv `byte0`); see the scanout EP and [`VinoDrmData::send_cp`]. + index: u8, + /// One-shot: this head's cursor `create` (sprite dimensions) was sent= before its first + /// image upload (per head -- the global one would skip head 1's creat= e). + cursor_primed: core::sync::atomic::AtomicBool, + #[pin] + scanout: Mutex, + /// This head's downstream-monitor EDID (`None` until the CP channel d= elivers it). Only + /// head 0's EDID is read during bring-up; per-head EDID requests are = unconfirmed, so + /// head 1 falls back to a fixed CVT mode in `get_modes`. + #[pin] + cached_edid: Mutex>>, + #[pin] + crtc: Opaque, + #[pin] + primary: Opaque, + #[pin] + cursor: Opaque, + #[pin] + encoder: Opaque, + #[pin] + connector: Opaque, +} + +// SAFETY: as for `VinoDrmData` below -- the embedded C KMS objects are wr= itten only during +// single-threaded probe and thereafter serialised by the DRM core's own l= ocks. +unsafe impl Send for Head {} +// SAFETY: see the `Send` impl above. +unsafe impl Sync for Head {} + +impl Head { + fn new(index: u8) -> impl PinInit { + fn z() -> impl PinInit, Error> { + // SAFETY: an all-zero C KMS object is a valid starting point = (all callback + // pointers NULL); `kms_init` populates the rest via raw point= ers under `unsafe`. + Opaque::try_ffi_init(|p: *mut T| { + unsafe { ptr::write_bytes(p, 0, 1) }; + Ok(()) + }) + } + try_pin_init!(Self { + index, + cursor_primed: core::sync::atomic::AtomicBool::new(false), + scanout <- new_mutex!(ScanoutState { + enc: None, + cur: VVec::new(), + seq: 0, + dims: (0, 0), + active_timing: None, + hint: 0, + }), + cached_edid <- new_mutex!(Option::>::None), + crtc <- z(), + primary <- z(), + cursor <- z(), + encoder <- z(), + connector <- z(), + }) + } + + /// This head's video bulk-OUT endpoint. + fn video_ep(&self) -> u8 { + HEAD_EP[self.index as usize] + } + + /// Fire a hotplug on this head's connector so the compositor re-probe= s [`detect`]. + fn fire_hotplug(&self) { + // SAFETY: called after `drm_dev_register`; the embedded connector= is initialised + // and its `dev` is our live drm_device. Safe from process context. + unsafe { + let dev =3D (*self.connector.get()).dev; + if !dev.is_null() { + bindings::drm_kms_helper_hotplug_event(dev); + } + } + } +} + +/// DRM device-private data. Holds [`NHEADS`] display [`Head`]s (each a CR= TC + primary + +/// cursor plane + encoder + connector) and the shared KMS vtables inline,= so they keep +/// stable addresses for the device's lifetime. All C objects zeroed at in= it; filled by +/// [`kms_init`]. Also keeps the bound USB interface (to reach the video E= Ps) and the engaged +/// CP session. +#[pin_data] +pub(super) struct VinoDrmData { + intf: ARef, + /// The engaged CP session for runtime KMS-driven sends (`None` until + /// [`VinoDrmData::publish_session`]). See [`CpLink`] and [`VinoDrmDat= a::send_cp`]. + #[pin] + cp_link: Mutex>, + #[pin] + head0: Head, + #[pin] + head1: Head, + // Shared vtables (one set for all heads; the callbacks recover the he= ad from the C + // object pointer). One `drm_plane_funcs` for both planes; per-plane h= elper funcs because + // the primary's `atomic_update` scans out while the cursor's sends cu= rsor CP. + #[pin] + conn_funcs: Opaque, + #[pin] + conn_helper: Opaque, + #[pin] + crtc_funcs: Opaque, + #[pin] + crtc_helper: Opaque, + #[pin] + plane_funcs: Opaque, + #[pin] + primary_helper: Opaque, + #[pin] + cursor_helper: Opaque, + #[pin] + encoder_funcs: Opaque, + #[pin] + mode_cfg_funcs: Opaque, +} + +// SAFETY: the embedded C KMS objects are written only during single-threa= ded +// `probe()` (before `drm_dev_register`), and thereafter are owned and ser= ialised by +// the DRM core under its own modeset/atomic locks -- Rust never aliases t= hem again. +// This is the conventional assertion for drivers embedding C KMS state un= til the +// kernel grows safe Rust KMS abstractions. +unsafe impl Send for VinoDrmData {} +// SAFETY: see the `Send` impl above. +unsafe impl Sync for VinoDrmData {} + +impl VinoDrmData { + /// Zero-initialise all embedded C objects (so each `Option` vtabl= e slot is + /// `None`); [`kms_init`] then fills in only the callbacks we implemen= t. `intf` + /// is the bound USB interface, kept so the scanout path can reach EP0= 8. + pub(super) fn new(intf: ARef) -> impl PinInit { + fn z() -> impl PinInit, Error> { + // SAFETY: an all-zero C KMS object / funcs table is a valid s= tarting + // point (all callback pointers NULL); the `_init` helpers pop= ulate the + // rest, and we only read it back through raw pointers under `= unsafe`. + Opaque::try_ffi_init(|p: *mut T| { + unsafe { ptr::write_bytes(p, 0, 1) }; + Ok(()) + }) + } + try_pin_init!(Self { + intf, + cp_link <- new_mutex!(Option::::None), + head0 <- Head::new(0), + head1 <- Head::new(1), + conn_funcs <- z(), + conn_helper <- z(), + crtc_funcs <- z(), + crtc_helper <- z(), + plane_funcs <- z(), + primary_helper <- z(), + cursor_helper <- z(), + encoder_funcs <- z(), + mode_cfg_funcs <- z(), + }) + } + + /// The display heads, in index order. + fn heads(&self) -> [&Head; NHEADS] { + [&self.head0, &self.head1] + } + + /// Recover the [`Head`] that owns a given C KMS object, by pointer id= entity. Used by the + /// connector/CRTC/plane callbacks (which receive a raw C pointer) to = find their head. + fn head_by_connector(&self, c: *mut bindings::drm_connector) -> Option= <&Head> { + self.heads().into_iter().find(|h| h.connector.get() =3D=3D c) + } + fn head_by_crtc(&self, c: *mut bindings::drm_crtc) -> Option<&Head> { + self.heads().into_iter().find(|h| h.crtc.get() =3D=3D c) + } + fn head_by_primary(&self, p: *mut bindings::drm_plane) -> Option<&Head= > { + self.heads().into_iter().find(|h| h.primary.get() =3D=3D p) + } + fn head_by_cursor(&self, p: *mut bindings::drm_plane) -> Option<&Head>= { + self.heads().into_iter().find(|h| h.cursor.get() =3D=3D p) + } + + /// Cache the dock's EDID (read during probe) on head 0 for [`get_mode= s`] to install, then + /// fire a hotplug so the compositor re-probes the connector -- which = now reports connected + /// (see [`detect`]) and exposes the monitor's real mode list. Only he= ad 0's downstream EDID + /// is read during bring-up (per-head EDID requests are unconfirmed). + pub(super) fn set_edid(&self, blob: KVec) { + *self.head0.cached_edid.lock() =3D Some(blob); + self.head0.fire_hotplug(); + } + + /// Fire a hotplug on every head's connector so the compositor re-prob= es [`detect`] -- used + /// after the bring-up work item completes to expose the live-scanout = outputs. + pub(super) fn fire_hotplug(&self) { + for h in self.heads() { + h.fire_hotplug(); + } + } + + /// Publish the engaged CP session so the KMS callbacks can send runti= me CP messages. + /// Called once by the bring-up work item after the dock acks (`acks >= 0`). + /// `wire_seq`/`counter` are the next free values past the bring-up CP= setup. + pub(super) fn publish_session(&self, ks: &[u8; 16], riv: &[u8; 8], wir= e_seq: u32, counter: u16) { + *self.cp_link.lock() =3D Some(CpLink { ks: *ks, riv: *riv, wire_se= q, counter }); + } + + /// Seal and send one interactive CP message on EP02 for head `head_in= dex`, advancing the + /// session keystream. The DL3 CP stream selects the head via the riv = `byte0 ^ 0x80` (head 0 + /// base, head 1 flipped). `build(counter)` produces the inner CP mess= age for the + /// dock-echoed `counter` it is handed (e.g. [`super::cp::set_mode`]);= `tag_reserved` + /// trailing bytes are dropped before the live Dl3Cmac is appended (se= t-mode reserves a + /// 16-byte placeholder; messages with no placeholder pass 0). Returns= `Ok(())` as a + /// **no-op when CP is not engaged**. The `cp_link` mutex serialises c= oncurrent KMS + /// callbacks. Runs from the atomic-commit context (same as the scanou= t), so the blocking + /// `bulk_send` is fine. NOTE: head 1's `wire_seq`/counter sharing wit= h head 0 is an + /// assumption (both share `cp_link`); the riv differs so the keystrea= ms differ. Unconfirmed + /// (CP-wall-gated) -- revisit when the dock engages. + pub(super) fn send_cp( + &self, + head_index: u8, + id: u16, + tag_reserved: usize, + build: impl FnOnce(u16) -> Result>, + ) -> Result { + let mut guard =3D self.cp_link.lock(); + // `&mut *guard` forces the guard's `DerefMut` to `&mut Option` so `as_mut` + // resolves to `Option::as_mut` (the guard has its own inherent `a= s_mut`). + let Some(link) =3D (&mut *guard).as_mut() else { + return Ok(()); // CP not engaged -- nothing to send + }; + // Head select: head 1's CP stream flips the riv byte0 (see `decod= e_any`/CP-HANDSHAKE). + let mut riv =3D link.riv; + if head_index =3D=3D 1 { + riv[0] ^=3D 0x80; + } + let msg =3D build(link.counter)?; + let content =3D &msg[..msg.len().saturating_sub(tag_reserved)]; + let frame =3D super::cp::seal_interactive(&link.ks, &riv, id, link= .wire_seq, content)?; + let dev: &super::usb::Device =3D self.intf.as_ref(); + dev.bulk_send(super::EP_CTRL_OUT, &frame, super::timeout())?; + // Advance the AES-CTR block counter by the content blocks only (t= he appended Dl3Cmac + // tag is sent in clear, not keystreamed) and bump the dock-echoed= inner counter. + link.wire_seq =3D link.wire_seq.wrapping_add(((content.len() + 15)= / 16) as u32); + link.counter =3D link.counter.wrapping_add(1); + Ok(()) + } +} + +/// GEM object inner data. Empty: the shmem-backed `drm::gem::shmem::Objec= t` (which +/// wires `drm_gem_shmem_dumb_create`, so userspace `DRM_IOCTL_MODE_CREATE= _DUMB` +/// works) is enough until the EP08 scanout path consumes the framebuffers. +#[pin_data] +pub(super) struct VinoObject {} + +impl drm::gem::DriverObject for VinoObject { + type Driver =3D VinoDrmDriver; + type Args =3D (); + + fn new( + _dev: &drm::Device, + _size: usize, + _args: (), + ) -> impl PinInit { + try_pin_init!(VinoObject {}) + } +} + +/// Per-open DRM client state. Empty of driver data, but its lifetime is u= sed to +/// pin the module for the duration of an open DRM file (see [`VinoDrmFile= ::open`]). +#[pin_data(PinnedDrop)] +pub(super) struct VinoDrmFile {} + +impl drm::file::DriverFile for VinoDrmFile { + type Driver =3D VinoDrmDriver; + + fn open(_dev: &drm::Device) -> Result>> { + let file =3D KBox::try_pin_init(try_pin_init!(Self {}), GFP_KERNEL= )?; + // Pin this module while a DRM file is open. The Rust DRM `file_op= erations` + // are built with `owner =3D NULL` (drm/gem/mod.rs `create_fops`),= so the DRM + // core's `try_module_get(fops->owner)` on open is a no-op: an ope= n card fd + // does NOT keep the driver loaded. Unloading vino (rmmod, or USB = teardown at + // shutdown) while a compositor still holds `/dev/dri/cardN` then = frees the + // module's `.rodata` -- where the fops live -- under that open fd= , so the next + // ioctl/close dereferences freed memory and oopses the kernel (ob= served: KWin + // UAF in `__x64_sys_ioctl` / `put_files_struct`, "recursive fault= , reboot + // needed"). Take an explicit module reference here, released 1:1 = in + // `PinnedDrop` (run by `postclose_callback` on file close), to re= store the + // pin the NULL `fops.owner` drops. Remove once the binding sets `= fops.owner`. + // SAFETY: we are executing inside this module's own DRM `open` ca= llback, so + // the module is live; taking an extra reference via `__module_get= ` is sound. + unsafe { bindings::__module_get(crate::THIS_MODULE.as_ptr()) }; + Ok(file) + } +} + +#[pinned_drop] +impl PinnedDrop for VinoDrmFile { + fn drop(self: Pin<&mut Self>) { + // Release the module reference taken in `open` (balanced one-per-= open-file). + // SAFETY: balances the `__module_get` in `open`; `THIS_MODULE` is= valid for + // the lifetime of the module. + unsafe { bindings::module_put(crate::THIS_MODULE.as_ptr()) }; + } +} + +const INFO: drm::DriverInfo =3D drm::DriverInfo { + major: 0, + minor: 1, + patchlevel: 0, + name: c"vino", + desc: c"DisplayLink DL3 (Dell D6000) DRM driver", +}; + +#[vtable] +impl drm::Driver for VinoDrmDriver { + type Data =3D VinoDrmData; + type File =3D VinoDrmFile; + type Object =3D drm::gem::shmem::Object; + + const INFO: drm::DriverInfo =3D INFO; + // Atomic KMS driver (CRTC/plane/connector via the simple display pipe= ). + // Mirrors the FEAT_RENDER idiom added by patches/drm/0001. + const FEAT_MODESET: bool =3D true; + const FEAT_ATOMIC: bool =3D true; + + // No driver-private ioctls (GEM/dumb + KMS handled by the DRM core). + kernel::declare_drm_ioctls! {} +} + +// ---- KMS C callbacks --------------------------------------------------= ---- + +/// Install a real EDID blob on the connector via the standard DRM EDID +/// infrastructure and return the number of modes added (0 on failure). Th= is +/// reuses the kernel helpers -- no synthetic EDID. See CONTROL-PLANE.md. +fn install_edid(connector: *mut bindings::drm_connector, blob: &[u8]) -> i= 32 { + // SAFETY: `blob` is a valid byte buffer; `drm_edid_alloc` copies it. + let edid =3D unsafe { bindings::drm_edid_alloc(blob.as_ptr().cast(), b= lob.len()) }; + if edid.is_null() { + return 0; + } + // SAFETY: `connector` is valid during probe; `edid` is freshly alloca= ted above. + unsafe { bindings::drm_edid_connector_update(connector, edid) }; + // SAFETY: connector valid; adds the EDID-derived modes, returns the c= ount. + let n =3D unsafe { bindings::drm_edid_connector_add_modes(connector) }; + // SAFETY: `edid` was allocated by `drm_edid_alloc` and is no longer n= eeded. + unsafe { bindings::drm_edid_free(edid) }; + n +} + +/// Connector `.mode_valid`: reject any single mode whose pixel clock exce= eds the per-head +/// ceiling ([`MAX_HEAD_CLOCK_KHZ`], ~4K@60), so the compositor never offe= rs an over-spec mode +/// on +/// one head. The *combined* across-heads budget is enforced separately at= commit by +/// [`vino_atomic_check`]. +unsafe extern "C" fn mode_valid( + _connector: *mut bindings::drm_connector, + mode: *const bindings::drm_display_mode, +) -> bindings::drm_mode_status { + // SAFETY: `mode` is a valid drm_display_mode for the duration of the = call. + let clock =3D unsafe { (*mode).clock }; + if clock > MAX_HEAD_CLOCK_KHZ { + bindings::drm_mode_status_MODE_CLOCK_HIGH + } else { + bindings::drm_mode_status_MODE_OK + } +} + +/// `mode_config.funcs.atomic_check`: run the standard atomic checks, then= reject the commit if +/// the **combined** pixel clock of all active heads would exceed the dock= 's USB/DL3 budget +/// ([`MAX_TOTAL_CLOCK_KHZ`]) -- e.g. two simultaneous 4K modes. For each = head, the proposed +/// (new) CRTC state is used when the head is part of this commit, else it= s current committed +/// state; only `enable && active` heads count. +unsafe extern "C" fn vino_atomic_check( + dev: *mut bindings::drm_device, + state: *mut bindings::drm_atomic_commit, +) -> i32 { + // SAFETY: `dev`/`state` are valid for the duration of the atomic chec= k. + let rc =3D unsafe { bindings::drm_atomic_helper_check(dev, state) }; + if rc !=3D 0 { + return rc; + } + // SAFETY: `dev` is our live, registered drm_device. + let data: &VinoDrmData =3D unsafe { VinoDrmDevice::from_raw(dev) }; + let mut total_khz: i64 =3D 0; + for head in data.heads() { + let crtc =3D head.crtc.get(); + // SAFETY: read-only new-state accessor (a `rust_helper`, exposed = without the prefix); + // NULL when this head is not in the commit -- then fall back to i= ts current state. + let mut cs =3D unsafe { bindings::drm_atomic_get_new_crtc_state(st= ate, crtc) }; + if cs.is_null() { + // SAFETY: `crtc` is initialised; `.state` is its current comm= itted state (or NULL). + cs =3D unsafe { (*crtc).state }; + } + if cs.is_null() { + continue; + } + // SAFETY: `cs` is a live drm_crtc_state. + let (enable, active, clock) =3D unsafe { ((*cs).enable, (*cs).acti= ve, (*cs).mode.clock) }; + if enable && active { + total_khz +=3D clock as i64; + } + } + if total_khz > MAX_TOTAL_CLOCK_KHZ { + pr_warn!( + "vino: modeset rejected -- combined {total_khz} kHz pixel cloc= k over the {} kHz dock budget\n", + MAX_TOTAL_CLOCK_KHZ + ); + return EINVAL.to_errno(); + } + 0 +} + +/// Connector `.get_modes`: install the dock's real EDID (read during prob= e) when +/// available; otherwise fall back to a single 1920x1080@60 CVT mode. Read= ing the +/// real EDID gives the true monitor name/size and its native mode list (s= ee the +/// EDID Read path); the fallback keeps the connector usable when nothing = is +/// plugged into the dock or the CP channel has not yet delivered the EDID. +unsafe extern "C" fn get_modes(connector: *mut bindings::drm_connector) ->= i32 { + // SAFETY: `connector` is a valid, initialised connector during probe. + let dev =3D unsafe { (*connector).dev }; + // SAFETY: `dev` is our live, registered drm_device. + let ddev =3D unsafe { VinoDrmDevice::from_raw(dev) }; + let data: &VinoDrmData =3D ddev; + if let Some(head) =3D data.head_by_connector(connector) { + let guard =3D head.cached_edid.lock(); + if let Some(blob) =3D guard.as_ref() { + let n =3D install_edid(connector, blob); + if n > 0 { + return n; + } + } + } + // Fallback: single FALLBACK_W x FALLBACK_H @60 CVT mode, marked prefe= rred. + // SAFETY: `dev` is a valid drm_device; drm_cvt_mode allocates a mode. + let mode =3D unsafe { + bindings::drm_cvt_mode(dev, FALLBACK_W, FALLBACK_H, 60, false, fal= se, false) + }; + if mode.is_null() { + return 0; + } + // SAFETY: `mode` is freshly allocated and owned by the connector afte= r add. + unsafe { bindings::drm_mode_probed_add(connector, mode) }; + // SAFETY: connector is valid; set the fallback mode as preferred. + unsafe { bindings::drm_set_preferred_mode(connector, FALLBACK_W, FALLB= ACK_H) }; + 1 +} + +/// Connector `.detect`: report **disconnected** until the dock's downstre= am EDID has +/// actually been read over the CP channel, then **connected**. A virtual = connector +/// that always reports connected makes the compositor light up a phantom = output it +/// cannot drive -- no pixels reach the dock until the CP/EP08 path is up = -- which froze +/// KWin on plug (SSH stayed alive; unplug recovered it). Gating on a real= EDID mirrors +/// how `gud`/`udl` report monitor presence; [`VinoDrmData::set_edid`] fir= es a hotplug +/// so the compositor re-probes and enables the output once the EDID arriv= es. +unsafe extern "C" fn detect( + connector: *mut bindings::drm_connector, + _force: bool, +) -> bindings::drm_connector_status { + // SAFETY: `connector` is a valid connector embedded in our DRM device= -private. + let dev =3D unsafe { (*connector).dev }; + // SAFETY: `dev` is our live, registered drm_device. + let ddev =3D unsafe { VinoDrmDevice::from_raw(dev) }; + let data: &VinoDrmData =3D ddev; + let live_ready =3D super::CP_ENGAGED.load(core::sync::atomic::Ordering= ::SeqCst); + let has_edid =3D data + .head_by_connector(connector) + .is_some_and(|h| h.cached_edid.lock().is_some()); + if has_edid || live_ready { + // Force-connect (with the get_modes 1080p fallback) so a composit= or drives the CRTC and + // `primary_atomic_update` fires live frames -- but only once CP i= s engaged (not merely + // after + // bring-up): connecting the output makes the compositor push EP08= video, and doing that + // before the dock has engaged CP makes it fault and USB-reset in = a loop (the "EP08 + // write + // wedges the hub" mode). So stay disconnected until CP is up -- o= r a real EDID arrived. + bindings::drm_connector_status_connector_status_connected + } else { + bindings::drm_connector_status_connector_status_disconnected + } +} + +/// CRTC `.atomic_enable`: the display is turning on (scanout begins). Cap= tures the mode the +/// compositor selected -- any entry from the connector's full EDID-derive= d list -- as a +/// set-mode [`super::cp::Timing`] in [`ScanoutState::active_timing`] and = pushes a live +/// mode-set CP message for it (no-op until CP engages). The geometry chan= ge is also honoured +/// by the scanout path (`encode_and_send` re-inits on `dims` change). +unsafe extern "C" fn crtc_atomic_enable( + crtc: *mut bindings::drm_crtc, + _state: *mut bindings::drm_atomic_commit, +) { + // SAFETY: in `.atomic_enable` the crtc and its committed `state` are = valid; `state->mode` + // is a live drm_display_mode and `timing_from_drm_mode` only reads it. + let cs =3D unsafe { (*crtc).state }; + if cs.is_null() { + return; + } + let timing =3D unsafe { super::cp::timing_from_drm_mode(&(*cs).mode) }; + pr_info!( + "vino: KMS CRTC enable -- display ON, mode {}x{}@{} (scanout begin= s)\n", + timing.hactive, timing.vactive, timing.refresh_hz + ); + // SAFETY: `crtc` is valid; its `dev` is our live drm_device. + let dev =3D unsafe { (*crtc).dev }; + if dev.is_null() { + return; + } + // SAFETY: `dev` is our registered drm_device. + let data: &VinoDrmData =3D unsafe { VinoDrmDevice::from_raw(dev) }; + let Some(head) =3D data.head_by_crtc(crtc) else { + return; + }; + head.scanout.lock().active_timing =3D Some(timing); + // Push a live mode-set for the chosen mode (on this head's CP stream)= so the dock switches + // to it at runtime, not just the EDID-preferred mode the bring-up set= up sent. `set_mode` + // reserves a 16-byte tag placeholder. A no-op until the cipher is eng= aged. + if let Err(e) =3D data.send_cp(head.index, 0x48, 16, |ctr| super::cp::= set_mode(ctr, &timing)) { + pr_warn!("vino: head{} runtime mode-set send failed ({e:?})\n", he= ad.index); + } +} + +/// CRTC `.atomic_disable`: the display is turning off. +/// CRTC `.atomic_disable`: the display is turning off -- DPMS-off / blank= / suspend all land +/// here in atomic KMS (the compositor clears the CRTC `active` state). Th= e compositor stops +/// page-flipping, so no new frames are pushed; this resets the head's sca= nout state so a later +/// re-enable (DPMS-on) re-inits the encoder and sends a **full keyframe**= rather than diffing +/// against a shadow the dock may have dropped while blanked, and re-uploa= ds the cursor sprite. +/// +/// The dock holds the last frame when video stops (it has its own scanout= buffer), so the +/// monitor freezes the last image rather than going black; a true backlig= ht-standby would need +/// a dock power command that is not decoded (DLM's `Standby`/`Suspend`/`T= empPowerOff` are +/// internal, vtable-dispatched events with no wire frame -- the same dead= -end as gamma). +unsafe extern "C" fn crtc_atomic_disable( + crtc: *mut bindings::drm_crtc, + _state: *mut bindings::drm_atomic_commit, +) { + // SAFETY: in `.atomic_disable` the crtc and its `dev` are valid. + let dev =3D unsafe { (*crtc).dev }; + if dev.is_null() { + return; + } + // SAFETY: `dev` is our registered drm_device. + let data: &VinoDrmData =3D unsafe { VinoDrmDevice::from_raw(dev) }; + let Some(head) =3D data.head_by_crtc(crtc) else { + return; + }; + { + let mut st =3D head.scanout.lock(); + st.enc =3D None; // force a full re-init + keyframe on the next en= able + st.dims =3D (0, 0); + } + head.cursor_primed + .store(false, core::sync::atomic::Ordering::SeqCst); + pr_info!("vino: KMS CRTC disable -- head{} display OFF (scanout stoppe= d)\n", head.index); +} + +/// Cursor plane `.atomic_update`: the cursor sprite and/or position chang= ed. Sends the cursor +/// CP messages (create once + image when a sprite framebuffer is present,= then a move). Gated +/// on CP engagement; a no-op on current hardware (the CP wall). See [`cur= sor_send`]. +unsafe extern "C" fn cursor_atomic_update( + plane: *mut bindings::drm_plane, + _state: *mut bindings::drm_atomic_commit, +) { + if !super::CP_ENGAGED.load(core::sync::atomic::Ordering::SeqCst) { + return; + } + // SAFETY: in `.atomic_update` the plane and its committed state are v= alid for the commit. + let (dev_raw, fb, w, h, cx, cy) =3D unsafe { + let st =3D (*plane).state; + if st.is_null() { + return; + } + ( + (*plane).dev, + (*st).fb, + (*st).crtc_w as usize, + (*st).crtc_h as usize, + (*st).crtc_x, + (*st).crtc_y, + ) + }; + // SAFETY: `dev_raw` is our live, registered drm_device. + let data: &VinoDrmData =3D unsafe { VinoDrmDevice::from_raw(dev_raw) }; + let Some(head) =3D data.head_by_cursor(plane) else { + return; + }; + if let Err(e) =3D cursor_send(data, head, fb, w, h, cx, cy) { + pr_warn!("vino: head{} cursor update failed ({e:?})\n", head.index= ); + } +} + +/// Primary plane `.atomic_update`: a new framebuffer was flipped in -- th= e scanout hook. +/// Maps the framebuffer, converts XRGB8888 -> RGB565, Vino-encodes the ch= anged +/// region against the previous frame, and bulk-writes the EP08 video fram= e. +/// +/// The EP08 write only happens once the dock has engaged CP (see `docs/BL= OCKER.md`): +/// until then the dock NAKs/stalls EP08, so a normal module load must not= push frames on +/// every flip and thrash the dock. With the CP-engagement wall unsolved t= his never fires +/// on real hardware. +unsafe extern "C" fn primary_atomic_update( + plane: *mut bindings::drm_plane, + _state: *mut bindings::drm_atomic_commit, +) { + // Don't touch EP08 until the dock has engaged CP. Pushing video (and = the one-shot + // clear_halt of EPs 8/10/11/12) at a dock with a dead CP channel make= s it fault and + // USB-reset, which re-probes the driver in a ~2.7 s loop. + if !super::CP_ENGAGED.load(core::sync::atomic::Ordering::SeqCst) { + return; + } + // SAFETY: in `.atomic_update` the plane and its committed state are v= alid; the plane + // state and its framebuffer are valid for the duration of the commit. + let (dev_raw, fb, w, h, damage, rotation) =3D unsafe { + let st =3D (*plane).state; + if st.is_null() { + return; + } + // Plane destination geometry =3D=3D the negotiated mode (the comp= ositor sizes the primary + // plane 1:1 with a virtual output), so this drives the dynamic sc= anout resolution. + let (w, h) =3D ((*st).crtc_w as usize, (*st).crtc_h as usize); + ((*plane).dev, (*st).fb, w, h, damage_bbox(st), (*st).rotation) + }; + if fb.is_null() { + return; + } + // Recover our device-private data + this plane's head from the raw dr= m_device. + // SAFETY: `dev_raw` is our live, registered drm_device. + let ddev =3D unsafe { VinoDrmDevice::from_raw(dev_raw) }; + let data: &VinoDrmData =3D ddev; + let Some(head) =3D data.head_by_primary(plane) else { + return; + }; + + use core::sync::atomic::Ordering::Relaxed; + // Throttle: while scanout is failing (dock NAKing because CP isn't en= gaged), skip the + // upcoming pageflips set by the backoff below instead of converting+e= ncoding+sending a + // frame the dock will just drop. The backoff is shared across heads (= a coarse global rate + // limit) -- fine while it never fires on real hardware (CP wall). + let skip =3D super::SCANOUT_SKIP.load(Relaxed); + if skip > 0 { + super::SCANOUT_SKIP.store(skip - 1, Relaxed); + return; + } + // Read this head's CRTC GAMMA_LUT (if a compositor set one) and apply= it host-side in the + // conversion below -- there is no dock-side gamma message (see `read_= gamma_lut`). + let gamma =3D read_gamma_lut(head); + match scanout_one(data, head, fb, w, h, damage, rotation, gamma.as_ref= ()) { + Ok(()) =3D> { + let n =3D super::SCANOUT_FAILS.swap(0, Relaxed); + super::SCANOUT_SKIP.store(0, Relaxed); + if n > 0 { + pr_info!("vino: scanout recovered after {n} failed frame(s= )\n"); + } + } + Err(e) =3D> { + // The dock NAKs every EP08 write (EPROTO) until CP engages --= expected and not + // actionable. Log the first failure and then at exponentially= sparser points so + // dmesg isn't flooded, and back off the scanout rate. + let n =3D super::SCANOUT_FAILS.fetch_add(1, Relaxed) + 1; + if n =3D=3D 1 || n.is_power_of_two() { + pr_err!("vino: scanout frame failed ({e:?}) [x{n}] -- thro= ttling\n"); + } + // Linear backoff capped at 120 frames (~2 s @ 60 Hz) between = probe attempts, so + // recovery (CP engaging) is still detected within ~2 s while = idle CPU stays low. + super::SCANOUT_SKIP.store(core::cmp::min(n, 120), Relaxed); + } + } +} + +/// Map an output pixel `(dx, dy)` back to its source-framebuffer pixel `(= sx, sy)` under a DRM +/// plane `rotation` bitmask (`DRM_MODE_ROTATE_*` | `DRM_MODE_REFLECT_*`, = the values the +/// standard `drm_plane_create_rotation_property` exposes). `sw`/`sh` are = the SOURCE +/// (framebuffer) dimensions; the output dimensions are `(sw, sh)` for 0 d= eg/180 deg and `(sh, sw)` +/// for 90 deg/270 deg (the caller swaps source vs output accordingly). Ro= tation is clockwise; +/// reflection is applied in source space after rotation. Pure + total (sa= turating), so it is +/// unit-tested directly. Used by [`encode_and_send`] to honour the connec= tor's rotation +/// property -- DLM rotates host-side, vino rotates in the scanout encode. +pub(super) fn rot_src( + rotation: u32, + dx: usize, + dy: usize, + sw: usize, + sh: usize, +) -> (usize, usize) { + let xmax =3D sw.saturating_sub(1); + let ymax =3D sh.saturating_sub(1); + let rot =3D rotation & bindings::DRM_MODE_ROTATE_MASK; + let (mut sx, mut sy) =3D if rot =3D=3D bindings::DRM_MODE_ROTATE_90 { + (dy, ymax.saturating_sub(dx)) + } else if rot =3D=3D bindings::DRM_MODE_ROTATE_180 { + (xmax.saturating_sub(dx), ymax.saturating_sub(dy)) + } else if rot =3D=3D bindings::DRM_MODE_ROTATE_270 { + (xmax.saturating_sub(dy), dx) + } else { + (dx, dy) // ROTATE_0 / unset + }; + if rotation & bindings::DRM_MODE_REFLECT_X !=3D 0 { + sx =3D xmax.saturating_sub(sx); + } + if rotation & bindings::DRM_MODE_REFLECT_Y !=3D 0 { + sy =3D ymax.saturating_sub(sy); + } + (sx, sy) +} + +/// True if `rotation` swaps width/height (90 deg or 270 deg), so the sour= ce framebuffer is +/// portrait while the scanned-out display is landscape (or vice versa). +fn rotation_swaps_dims(rotation: u32) -> bool { + let r =3D rotation & bindings::DRM_MODE_ROTATE_MASK; + r =3D=3D bindings::DRM_MODE_ROTATE_90 || r =3D=3D bindings::DRM_MODE_R= OTATE_270 +} + +/// True if `rotation` is anything other than the identity (plain 0 deg), = i.e. the scanout must +/// remap every pixel and cannot take the damage-clip fast path. +fn rotation_active(rotation: u32) -> bool { + rotation !=3D 0 && rotation !=3D bindings::DRM_MODE_ROTATE_0 +} + +/// Damage bounding box (pixels, clamped to the scanout) for this atomic u= pdate, or +/// `None` meaning "convert the whole frame". Reads the standard `FB_DAMAG= E_CLIPS` blob the +/// compositor attaches to the plane state and unions its rects. The Vino = encoder already +/// shadow-diffs against the previous frame, so unchanged regions emit not= hing regardless; +/// the win here is skipping the XRGB8888->RGB565 conversion of those regi= ons. Returns `None` +/// when no damage is advertised, `ignore_damage_clips` is set, or the uni= on is degenerate +/// (all treated as a full-frame update). +/// +/// SAFETY: `st` must be a valid `drm_plane_state` for the duration of the= call. +unsafe fn damage_bbox( + st: *const bindings::drm_plane_state, +) -> Option<(usize, usize, usize, usize)> { + // SAFETY: caller guarantees `st` is a live plane state. + let (blob, ignore) =3D unsafe { ((*st).fb_damage_clips, (*st).ignore_d= amage_clips) }; + if ignore || blob.is_null() { + return None; + } + // SAFETY: `blob` is non-null and lives as long as the plane state. + let (data, len) =3D unsafe { ((*blob).data as *const bindings::drm_mod= e_rect, (*blob).length) }; + let n =3D len / core::mem::size_of::(); + if data.is_null() || n =3D=3D 0 { + return None; + } + let (mut x0, mut y0, mut x1, mut y1) =3D (i32::MAX, i32::MAX, i32::MIN= , i32::MIN); + for i in 0..n { + // SAFETY: `i < n`, the rect array length implied by `blob.length`. + let r =3D unsafe { &*data.add(i) }; + x0 =3D x0.min(r.x1); + y0 =3D y0.min(r.y1); + x1 =3D x1.max(r.x2); + y1 =3D y1.max(r.y2); + } + // Clamp to the plane's destination geometry and reject empty/degenera= te boxes (fall back to + // a full frame). Read crtc_w/crtc_h off the plane state so the clamp = tracks the live mode, + // not a fixed 1080p. + // SAFETY: caller guarantees `st` is a live plane state. + let (pw, ph) =3D unsafe { ((*st).crtc_w as i32, (*st).crtc_h as i32) }; + let cx0 =3D x0.clamp(0, pw) as usize; + let cy0 =3D y0.clamp(0, ph) as usize; + let cx1 =3D x1.clamp(0, pw) as usize; + let cy1 =3D y1.clamp(0, ph) as usize; + if cx1 <=3D cx0 || cy1 <=3D cy0 { + return None; + } + Some((cx0, cy0, cx1, cy1)) +} + +/// Read the CRTC's `GAMMA_LUT` and flatten it into three 256-entry 8-bit = lookup tables +/// (R, G, B), or `None` when no gamma is set (the common case -- the conv= ersion then runs at +/// full speed). DLM gamma-corrects pixels **host-side** before encoding; = the DL3 dock has no +/// gamma CP message (the `NotifyGammaCurve`/`SetGammaMode` handlers are D= LM-internal, +/// vtable-dispatched, and emit no wire frame -- confirmed against the dec= ompile and every +/// capture), so vino applies the LUT in the scanout exactly like it appli= es `rotation`. The +/// blob holds `n` `drm_color_lut` entries (u16 per channel); 8-bit input = `i` maps to entry +/// `i*(n-1)/255` and takes that entry's high 8 bits. +fn read_gamma_lut(head: &Head) -> Option<[[u8; 256]; 3]> { + // SAFETY: `head.crtc` was initialised in `kms_init`; its committed `s= tate` and the + // gamma_lut blob it references are valid for the duration of the atom= ic commit. + let blob =3D unsafe { + let cs =3D (*head.crtc.get()).state; + if cs.is_null() { + return None; + } + (*cs).gamma_lut + }; + if blob.is_null() { + return None; + } + // SAFETY: `blob` is a live drm_property_blob for the commit; `data`/`= length` are valid. + let (ptr, len) =3D + unsafe { ((*blob).data as *const bindings::drm_color_lut, (*blob).= length) }; + let n =3D len / core::mem::size_of::(); + if ptr.is_null() || n =3D=3D 0 { + return None; + } + let mut t =3D [[0u8; 256]; 3]; + for i in 0..256usize { + let idx =3D if n =3D=3D 1 { 0 } else { i * (n - 1) / 255 }; + // SAFETY: `idx < n`, within the blob's `n` `drm_color_lut` entrie= s. + let e =3D unsafe { &*ptr.add(idx) }; + t[0][i] =3D (e.red >> 8) as u8; + t[1][i] =3D (e.green >> 8) as u8; + t[2][i] =3D (e.blue >> 8) as u8; + } + Some(t) +} + +/// vmap `fb`, encode it, and push one EP08 frame. Split out so `?` can be= used. `damage` +/// bounds the XRGB8888->RGB565 conversion to the changed region (see [`da= mage_bbox`]). +fn scanout_one( + data: &VinoDrmData, + head: &Head, + fb: *mut bindings::drm_framebuffer, + w: usize, + h: usize, + damage: Option<(usize, usize, usize, usize)>, + rotation: u32, + gamma: Option<&[[u8; 256]; 3]>, +) -> Result { + // `w`/`h` are the plane's destination (displayed) geometry (=3D=3D th= e negotiated mode), + // threaded in from `primary_atomic_update`, so the scanout follows th= e live mode (e.g. the + // dock's + // native 4K) instead of a hardcoded 1080p. `drm_framebuffer` is opaqu= e in the bindings, so + // the geometry comes from the plane state; our XRGB8888 buffers are p= acked. Under a + // 90 deg/270 deg + // `rotation` the source framebuffer is portrait relative to the displ= ay, so its row pitch + // tracks the *source* width -- `encode_and_send` derives that from `r= otation`. + if w =3D=3D 0 || h =3D=3D 0 { + return Err(EINVAL); + } + + // Map the framebuffer's backing pages into the kernel address space. + // SAFETY: `iosys_map` is POD (a pointer union + bool); all-zero is a = valid, + // "not mapped" value that `drm_gem_fb_vmap` overwrites for present pl= anes. + let mut map: [bindings::iosys_map; 4] =3D unsafe { core::mem::zeroed()= }; + let mut dmap: [bindings::iosys_map; 4] =3D unsafe { core::mem::zeroed(= ) }; + // SAFETY: `fb` is a valid framebuffer with GEM-backed storage. + to_result(unsafe { bindings::drm_gem_fb_vmap(fb, map.as_mut_ptr(), dma= p.as_mut_ptr()) })?; + + // SAFETY: plane 0's CPU virtual address, valid until `drm_gem_fb_vunm= ap`. + let vaddr =3D unsafe { map[0].__bindgen_anon_1.vaddr } as *const u8; + let result =3D if vaddr.is_null() { + Err(EINVAL) + } else { + encode_and_send(data, head, vaddr, w, h, damage, rotation, gamma) + }; + + // SAFETY: balances the vmap above with the same `map`. + unsafe { bindings::drm_gem_fb_vunmap(fb, map.as_mut_ptr()) }; + result +} + +/// Convert the mapped XRGB8888 frame to RGB565, Vino-encode it against th= e previous +/// frame, and bulk-write the resulting EP08 frame to the dock. +fn encode_and_send( + data: &VinoDrmData, + head: &Head, + vaddr: *const u8, + w: usize, + h: usize, + damage: Option<(usize, usize, usize, usize)>, + rotation: u32, + gamma: Option<&[[u8; 256]; 3]>, +) -> Result { + // Convert XRGB8888 (LE bytes B,G,R,X) -> RGB565 and encode, all under= the scanout lock. + // The conversion fills a PERSISTENT `cur` buffer (allocated once with= the encoder) in + // place -- no per-frame ~4 MiB kmalloc, which is what was failing wit= h ENOMEM and flooding + // the log. The encoder's shadow buffer is mutable state, so the lock = is needed regardless. + let frame =3D { + let mut st =3D head.scanout.lock(); + // On the first frame `cur` is freshly zeroed, so the whole buffer= must be filled + // regardless of the advertised damage (a partial fill would scan = out black around + // the damage box). Afterwards, unchanged regions of `cur` already= hold the previous + // frame (=3D=3D the shadow the encoder diffs against), so convert= ing only the damage box + // is correct and skips the rest of the XRGB8888->RGB565 work. + // Re-initialise the encoder/shadow/conversion buffers on the firs= t frame AND whenever + // the framebuffer geometry changes (a mode switch), so they alway= s match `cur`'s size. + let first =3D st.enc.is_none() || st.dims !=3D (w, h); + if first { + st.enc =3D Some(super::video::Encoder::new(w, h, super::video:= :Mode::Rle)?); + st.cur =3D VVec::from_elem(0u16, w * h, GFP_KERNEL)?; + st.dims =3D (w, h); + st.hint =3D 0; // previous frame's size no longer applies at t= he new geometry + } + // Source framebuffer geometry: a 90 deg/270 deg rotation makes th= e source portrait relative + // to the displayed `w`x`h`, so its packed row pitch tracks the *s= ource* width. + let (sw, sh) =3D if rotation_swaps_dims(rotation) { (h, w) } else = { (w, h) }; + let pitch =3D sw * 4; + // Damage clips are in source coordinates and don't map cleanly th= rough a rotation, so + // convert the whole frame on a (re)allocation OR whenever a rotat= ion/reflection is in + // effect; the encoder still shadow-diffs, so unchanged pixels emi= t nothing regardless. + // A gamma LUT recolours every pixel, so it also forces a full con= vert (still no extra + // wire traffic -- the recoloured output is identical frame-to-fra= me for static + // content, + // so the shadow-diff emits nothing for unchanged regions). + let full =3D first || rotation_active(rotation) || gamma.is_some(); + let (x0, y0, x1, y1) =3D if full { (0, 0, w, h) } else { damage.un= wrap_or((0, 0, w, h)) }; + // Split-borrow the fields so the in-place fill and the &mut encod= e can coexist. + let ScanoutState { enc, cur, seq, hint, dims: _, active_timing: _ = } =3D &mut *st; + for dy in y0..y1 { + for dx in x0..x1 { + // Output pixel (dx,dy) -> source pixel under the plane ro= tation/reflection. + let (sx, sy) =3D rot_src(rotation, dx, dy, sw, sh); + // SAFETY: `sy*pitch + sx*4 + 3` is within the mapped sour= ce framebuffer + // (`sw*sh*4` bytes); `rot_src` guarantees `sx < sw`, `sy = < sh`. + let px =3D + unsafe { (vaddr.add(sy * pitch + sx * 4) as *const u32= ).read_unaligned() }; + let (mut r, mut g, mut b) =3D + (((px >> 16) & 0xff) as usize, ((px >> 8) & 0xff) as u= size, (px & 0xff) as usize); + // Apply the CRTC gamma LUT host-side (DLM gamma-corrects = pixels before + // encoding -- there is no dock-side gamma CP message; see= `read_gamma_lut`). + if let Some(t) =3D gamma { + r =3D t[0][r] as usize; + g =3D t[1][g] as usize; + b =3D t[2][b] as usize; + } + cur[dy * w + dx] =3D + (((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3)) as u16; + } + } + let s =3D *seq; + *seq =3D seq.wrapping_add(1); + let enc =3D enc.as_mut().ok_or(ENOMEM)?; + // Encode straight into the outgoing frame buffer: reserve the EP0= 8 header up + // front, append the codec stream in place, then back-patch the he= ader now that + // the payload length is known. This replaces a two-allocation/ext= ra-copy path + // (encode -> KVec, then frame_to_ep08 -> second KVec) with a sing= le buffer, + // and `hint` pre-sizes it from the last frame so the encode rarel= y reallocates. + const HDR: usize =3D super::video::EP08_HDR_LEN; + let mut frame =3D KVec::with_capacity((*hint).max(HDR + 64), GFP_K= ERNEL)?; + frame.extend_from_slice(&[0u8; HDR], GFP_KERNEL)?; // header place= holder + enc.encode_into(&*cur, &mut frame)?; + let payload_len =3D frame.len() - HDR; + super::video::write_ep08_header(&mut frame[..HDR], payload_len, s); + *hint =3D frame.len(); + frame + }; + + // Push the frame to this head's video endpoint (lock released). + let dev: &super::usb::Device =3D data.intf.as_ref(); + // First live-scanout frame: clear-halt the four iface-0 bulk-OUT vide= o endpoints + // (0x08 main + 0x0a/0x0b/0x0c aux, covering every head) so the first = write doesn't + // ETIMEDOUT on a stale endpoint toggle. DLM clear-halts these at enga= gement (the + // "startRender" step). Once, globally. + if !super::EP08_SCANOUT_PRIMED.swap(true, core::sync::atomic::Ordering= ::SeqCst) { + for ep in [0x08u8, 0x0a, 0x0b, 0x0c] { + let _ =3D dev.clear_halt(ep); + } + pr_info!("vino: video endpoints primed (clear-halt 8/10/11/12)\n"); + } + // Head 0 -> EP 0x08, head 1 -> EP 0x0a (see `HEAD_EP`). + dev.bulk_send(head.video_ep(), &frame, super::timeout())?; + Ok(()) +} + +/// Send the cursor CP messages for the current sprite + position (called = from +/// [`cursor_atomic_update`]). `fb` is the cursor sprite framebuffer (`Non= e`/null =3D hidden), +/// `w`x`h` its size, `(cx, cy)` the on-CRTC position. Sends `create` (onc= e, the constant +/// sprite size), `image` (the ARGB8888 sprite -- its little-endian memory= bytes are already +/// the +/// `B,G,R,A` order the dock wants, copied row-by-row to honour the frameb= uffer pitch), then a +/// `move`. Every send routes through [`VinoDrmData::send_cp`], so all of = this is a no-op until +/// the CP cipher engages (the wall). A hidden cursor currently just re-is= sues a move (a +/// dedicated hide message is a future refinement). +fn cursor_send( + data: &VinoDrmData, + head: &Head, + fb: *mut bindings::drm_framebuffer, + w: usize, + h: usize, + cx: i32, + cy: i32, +) -> Result { + let hid =3D head.index; // cursor messages carry the head id at off22;= CP routes by head too + let (mx, my) =3D ( + cx.clamp(0, u16::MAX as i32) as u16, + cy.clamp(0, u16::MAX as i32) as u16, + ); + if fb.is_null() || w =3D=3D 0 || h =3D=3D 0 { + // Hidden cursor: no sprite to upload, just track the position. + return data.send_cp(hid, 0x1a, 0, |ctr| super::cp::cursor_move(ctr= , hid, mx, my)); + } + // Declare the sprite dimensions once per head, then upload the bitmap= . We don't diff sprite + // content yet, so the image is re-sent on every sprite-present update. + if !head.cursor_primed.swap(true, core::sync::atomic::Ordering::SeqCst= ) { + data.send_cp(hid, 0x1b, 0, |ctr| super::cp::cursor_create(ctr, w a= s u16, h as u16))?; + } + // vmap the sprite; copy `w*h*4` BGRA bytes row-by-row (the source pit= ch is `w*4` for our + // packed cursor buffers, but copying per-row keeps it correct if that= ever changes). + let pitch =3D w * 4; + // SAFETY: `iosys_map` is POD; all-zero is a valid "not mapped" value = `drm_gem_fb_vmap` + // fills. + let mut map: [bindings::iosys_map; 4] =3D unsafe { core::mem::zeroed()= }; + let mut dmap: [bindings::iosys_map; 4] =3D unsafe { core::mem::zeroed(= ) }; + // SAFETY: `fb` is a valid cursor framebuffer with GEM-backed storage. + to_result(unsafe { bindings::drm_gem_fb_vmap(fb, map.as_mut_ptr(), dma= p.as_mut_ptr()) })?; + // SAFETY: plane 0's CPU virtual address, valid until `drm_gem_fb_vunm= ap`. + let vaddr =3D unsafe { map[0].__bindgen_anon_1.vaddr } as *const u8; + let res =3D if vaddr.is_null() { + Err(EINVAL) + } else { + (|| -> Result { + let mut bgra =3D KVec::with_capacity(w * h * 4, GFP_KERNEL)?; + for y in 0..h { + // SAFETY: `[y*pitch, y*pitch + w*4)` is within the mapped= `h*pitch` sprite. + let row =3D unsafe { core::slice::from_raw_parts(vaddr.add= (y * pitch), w * 4) }; + bgra.extend_from_slice(row, GFP_KERNEL)?; + } + data.send_cp(hid, 0x1c, 0, |ctr| { + super::cp::cursor_image(ctr, w as u16, h as u16, &bgra) + }) + })() + }; + // SAFETY: balances the vmap above with the same `map`. + unsafe { bindings::drm_gem_fb_vunmap(fb, map.as_mut_ptr()) }; + res?; + data.send_cp(hid, 0x1a, 0, |ctr| super::cp::cursor_move(ctr, hid, mx, = my)) +} + +/// Wire up the atomic KMS pipeline on `ddev` (called after `drm::Device::= new` and +/// before `drm_dev_register`). Sets `mode_config`, builds the virtual con= nector, +/// and initialises the atomic CRTC + primary/cursor planes + virtual enco= der. +pub(super) fn kms_init( + ddev: &drm::Device, +) -> Result { + let raw =3D ddev.as_raw(); + // Deref `drm::Device` -> `T::Data` to reach the embedded C objects. + let data: &VinoDrmData =3D ddev; + + // SAFETY: `raw` is a valid, not-yet-registered drm_device; the funcs/= objects + // referenced below live in device-private memory (`data`) for its lif= etime. + unsafe { + to_result(bindings::drmm_mode_config_init(raw))?; + + let mc =3D &mut (*raw).mode_config; + mc.min_width =3D 0; + mc.min_height =3D 0; + mc.max_width =3D 4096; + mc.max_height =3D 4096; + // Advertise a 64x64 hardware cursor (the dock's cursor sprite siz= e) so userspace + // drives the cursor plane instead of compositing the pointer into= the framebuffer. + mc.cursor_width =3D CURSOR_SIZE; + mc.cursor_height =3D CURSOR_SIZE; + let mcf =3D data.mode_cfg_funcs.get(); + (*mcf).fb_create =3D Some(bindings::drm_gem_fb_create); + // `vino_atomic_check` =3D the standard atomic check + the combine= d cross-head USB + // bandwidth budget (rejects e.g. two simultaneous 4K modes). + (*mcf).atomic_check =3D Some(vino_atomic_check); + (*mcf).atomic_commit =3D Some(bindings::drm_atomic_helper_commit); + mc.funcs =3D mcf; + + // ---- Shared vtables (one set for every head; the callbacks reco= ver the head from + // the C object pointer). Plane/CRTC `atomic_check` are left NULL:= a virtual sink + // accepts any configuration, and the helpers still invoke `atomic= _update`/ + // `atomic_enable` because the objects are assigned to the CRTC. + + // Connector funcs + helper. We report presence from the cached ED= ID (see `detect`) + // and deliver HPD ourselves (`set_edid`/`fire_hotplug`). + let cf =3D data.conn_funcs.get(); + (*cf).fill_modes =3D Some(bindings::drm_helper_probe_single_connec= tor_modes); + (*cf).detect =3D Some(detect); + (*cf).destroy =3D Some(bindings::drm_connector_cleanup); + (*cf).reset =3D Some(bindings::drm_atomic_helper_connector_reset); + (*cf).atomic_duplicate_state =3D + Some(bindings::drm_atomic_helper_connector_duplicate_state); + (*cf).atomic_destroy_state =3D + Some(bindings::drm_atomic_helper_connector_destroy_state); + (*data.conn_helper.get()).get_modes =3D Some(get_modes); + // Prune any single mode above the per-head pixel-clock ceiling (~= 4K@60). + (*data.conn_helper.get()).mode_valid =3D Some(mode_valid); + + // One `drm_plane_funcs` shared by both planes; per-plane helper f= uncs (the primary's + // `atomic_update` scans out, the cursor's sends cursor CP). + let plf =3D data.plane_funcs.get(); + (*plf).update_plane =3D Some(bindings::drm_atomic_helper_update_pl= ane); + (*plf).disable_plane =3D Some(bindings::drm_atomic_helper_disable_= plane); + (*plf).destroy =3D Some(bindings::drm_plane_cleanup); + (*plf).reset =3D Some(bindings::drm_atomic_helper_plane_reset); + (*plf).atomic_duplicate_state =3D + Some(bindings::drm_atomic_helper_plane_duplicate_state); + (*plf).atomic_destroy_state =3D Some(bindings::drm_atomic_helper_p= lane_destroy_state); + (*data.primary_helper.get()).atomic_update =3D Some(primary_atomic= _update); + (*data.cursor_helper.get()).atomic_update =3D Some(cursor_atomic_u= pdate); + + // CRTC funcs + helper. + let crf =3D data.crtc_funcs.get(); + (*crf).set_config =3D Some(bindings::drm_atomic_helper_set_config); + (*crf).page_flip =3D Some(bindings::drm_atomic_helper_page_flip); + (*crf).destroy =3D Some(bindings::drm_crtc_cleanup); + (*crf).reset =3D Some(bindings::drm_atomic_helper_crtc_reset); + (*crf).atomic_duplicate_state =3D + Some(bindings::drm_atomic_helper_crtc_duplicate_state); + (*crf).atomic_destroy_state =3D Some(bindings::drm_atomic_helper_c= rtc_destroy_state); + let crh =3D data.crtc_helper.get(); + (*crh).atomic_enable =3D Some(crtc_atomic_enable); + (*crh).atomic_disable =3D Some(crtc_atomic_disable); + + // Encoder funcs. + (*data.encoder_funcs.get()).destroy =3D Some(bindings::drm_encoder= _cleanup); + + // Build each head's objects (connector + primary/cursor planes + = CRTC + encoder). + for head in data.heads() { + build_head(raw, data, head)?; + } + + drm_mode_config_reset(raw); + } + Ok(()) +} + +/// Build one head's KMS objects -- connector + primary plane (scanout) + = cursor plane + CRTC + +/// virtual encoder -- using the shared vtables already filled in `data`. = Each is a complete +/// independent output (its own CRTC), so the compositor sees [`NHEADS`] m= onitors and routes +/// each to its own video EP / CP stream (see [`Head`]). +/// +/// SAFETY: `raw` is a valid, not-yet-registered drm_device; the `data`/`h= ead` C objects live +/// in device-private memory for its lifetime. +unsafe fn build_head(raw: *mut bindings::drm_device, data: &VinoDrmData, h= ead: &Head) -> Result { + // SAFETY: see the function contract; every object/vtable below is dev= ice-private memory. + unsafe { + // Connector. + let conn =3D head.connector.get(); + to_result(bindings::drm_connector_init( + raw, + conn, + data.conn_funcs.get(), + bindings::DRM_MODE_CONNECTOR_VIRTUAL as i32, + ))?; + (*conn).helper_private =3D data.conn_helper.get(); + (*conn).polled =3D bindings::DRM_CONNECTOR_POLL_HPD as u8; + + // Primary plane (XRGB8888 scanout). `possible_crtcs` is fixed up = once the CRTC exists. + let primary =3D head.primary.get(); + to_result(bindings::drm_universal_plane_init( + raw, + primary, + 0, + data.plane_funcs.get(), + PRIMARY_FORMATS.as_ptr(), + PRIMARY_FORMATS.len() as u32, + ptr::null(), + bindings::drm_plane_type_DRM_PLANE_TYPE_PRIMARY, + ptr::null(), + ))?; + (*primary).helper_private =3D data.primary_helper.get(); + + // Cursor plane (ARGB8888 sprite). + let cursor =3D head.cursor.get(); + to_result(bindings::drm_universal_plane_init( + raw, + cursor, + 0, + data.plane_funcs.get(), + CURSOR_FORMATS.as_ptr(), + CURSOR_FORMATS.len() as u32, + ptr::null(), + bindings::drm_plane_type_DRM_PLANE_TYPE_CURSOR, + ptr::null(), + ))?; + (*cursor).helper_private =3D data.cursor_helper.get(); + + // CRTC with both planes, plus a GAMMA_LUT (applied host-side in `= read_gamma_lut`). + let crtc =3D head.crtc.get(); + to_result(bindings::drm_crtc_init_with_planes( + raw, + crtc, + primary, + cursor, + data.crtc_funcs.get(), + ptr::null(), + ))?; + (*crtc).helper_private =3D data.crtc_helper.get(); + bindings::drm_crtc_enable_color_mgmt(crtc, 0, false, GAMMA_SIZE); + + // The CRTC now has an index: bind both planes and the encoder to = it. + let crtc_mask =3D 1u32 << (*crtc).index; + (*primary).possible_crtcs =3D crtc_mask; + (*cursor).possible_crtcs =3D crtc_mask; + + // Virtual encoder bound to this head's connector. + let encoder =3D head.encoder.get(); + to_result(bindings::drm_encoder_init( + raw, + encoder, + data.encoder_funcs.get(), + bindings::DRM_MODE_ENCODER_VIRTUAL as i32, + ptr::null(), + ))?; + (*encoder).possible_crtcs =3D crtc_mask; + to_result(bindings::drm_connector_attach_encoder(conn, encoder))?; + + // Rotation property on the primary plane (DLM rotates host-side; = vino remaps in the + // scanout encode -- see `rot_src`). Canonical helper; non-fatal o= n failure. + let supported =3D bindings::DRM_MODE_ROTATE_0 + | bindings::DRM_MODE_ROTATE_90 + | bindings::DRM_MODE_ROTATE_180 + | bindings::DRM_MODE_ROTATE_270 + | bindings::DRM_MODE_REFLECT_X + | bindings::DRM_MODE_REFLECT_Y; + let rc =3D bindings::drm_plane_create_rotation_property( + primary, + bindings::DRM_MODE_ROTATE_0, + supported, + ); + if rc !=3D 0 { + pr_warn!("vino: head{} rotation property unavailable ({rc})\n"= , head.index); + } + } + Ok(()) +} + +/// Thin wrapper so the `unsafe` block above reads cleanly. +unsafe fn drm_mode_config_reset(raw: *mut bindings::drm_device) { + // SAFETY: `raw` is a valid drm_device with mode_config initialised. + unsafe { bindings::drm_mode_config_reset(raw) }; +} diff --git a/drivers/gpu/drm/vino/vino.rs b/drivers/gpu/drm/vino/vino.rs index e9e6324b717b..1091dcc992c7 100644 --- a/drivers/gpu/drm/vino/vino.rs +++ b/drivers/gpu/drm/vino/vino.rs @@ -44,6 +44,7 @@ use kernel::{ alloc::flags::GFP_KERNEL, bindings, + drm, device::{self, Core}, error::code::{ENODEV, EINVAL}, prelude::*, @@ -79,6 +80,24 @@ fn timeout() -> Delta { /// hardware -- the dock runs the whole plaintext handshake but never enga= ges the encrypted CP. static CP_ENGAGED: core::sync::atomic::AtomicBool =3D core::sync::atomic::= AtomicBool::new(false); =20 +/// One-shot: clear-halt + prime the video endpoints before the first live= -scanout EP08 write. +static EP08_SCANOUT_PRIMED: core::sync::atomic::AtomicBool =3D + core::sync::atomic::AtomicBool::new(false); + +/// Consecutive failed live-scanout frames, for log rate-limiting. Until C= P engages, the dock +/// NAKs every EP08 write (EPROTO), so without this every compositor pagef= lip would spam dmesg. +static SCANOUT_FAILS: core::sync::atomic::AtomicU64 =3D core::sync::atomic= ::AtomicU64::new(0); + +/// Pageflip throttle: number of upcoming pageflips to skip before the nex= t scanout attempt +/// (a backoff while the dock NAKs). A single successful frame clears it. +static SCANOUT_SKIP: core::sync::atomic::AtomicU64 =3D core::sync::atomic:= :AtomicU64::new(0); + +/// Set once the bring-up work item finishes (AKE/CP attempt done). `detec= t` only connects the +/// live-scanout connector AFTER this, so a compositor enabling the output= cannot start EP08 +/// scanout on top of the still-running AKE on the same USB device. +static BRINGUP_COMPLETE: core::sync::atomic::AtomicBool =3D + core::sync::atomic::AtomicBool::new(false); + mod proto; mod crypto; mod rng; @@ -103,9 +122,13 @@ struct Session { cap_announce: KVec, } =20 +mod drm_sink; + /// Per-bound-interface driver state. struct VinoDriver { _intf: ARef, + /// The registered `drm::Device` (only on the control interface, iface= 0). + _ddev: Option>, } =20 /// Deferred bring-up work item: the bring-up sequence run on the system w= orkqueue instead @@ -115,6 +138,7 @@ struct VinoDriver { #[pin_data] struct BringUp { intf: ARef, + ddev: Option>, #[pin] work: Work, } @@ -124,10 +148,14 @@ impl HasWork for BringUp { self.work } } =20 impl BringUp { - fn new(intf: ARef) -> Result> { + fn new( + intf: ARef, + ddev: Option>, + ) -> Result> { Arc::pin_init( pin_init!(BringUp { intf, + ddev, work <- new_work!("vino::bring_up"), }), GFP_KERNEL, @@ -141,39 +169,73 @@ impl WorkItem for BringUp { fn run(this: Arc) { let cdev: &device::Device =3D this.intf.as_ref(); let dev: &usb::Device =3D this.intf.as_ref(); - // WIP scaffold: plaintext bring-up, the clean-room HDCP 2.2 AKE/L= C/SKE, then the - // post-SKE CP setup. Bind regardless of the outcome -- there is n= o display path until - // the dock engages the encrypted control plane, which it currentl= y never does (see the - // "help wanted" note at the top of the file). The DRM sink lands = in a later patch. + let ddev =3D &this.ddev; + // WIP scaffold: attempt the plaintext bring-up, then the clean-ro= om HDCP 2.2 + // AKE/LC/SKE, then the post-SKE CP setup. Bind regardless of the = outcome -- there + // is no display path until the dock engages the encrypted control= plane, which it + // currently never does (see the "help wanted" note at the top of = the file). match VinoDriver::bring_up(dev) { Ok(()) =3D> { dev_info!(cdev, "vino: plaintext session init OK\n"); match VinoDriver::run_ake(dev) { Ok(session) =3D> { dev_info!(cdev, "vino: HDCP AKE + LC + SKE complet= e (session keyed)\n"); + // Dev diagnostic: the live session key/riv, so th= e dock's encrypted + // EP84 replies can be decoded offline from a usbm= on capture. Behind + // pr_debug, so compiled out unless dynamic debug = is enabled. pr_debug!("vino: SESSION ks=3D{:02x?} riv=3D{:02x?= }\n", &session.ks, &session.riv); - // Phase 2c: drive the post-SKE CP setup. send_cp_= setup re-seals DLM's - // captured setup template under THIS session's li= ve ks/riv and sends it; - // `acks` counts the dock's encrypted wsub=3D0x45 = replies. THIS IS THE WALL: - // on a cold dock `acks` stays 0 -- the dock runs = the entire plaintext - // handshake but never engages the encrypted CP. + + // Phase 2c: drive the post-SKE CP setup. send_cp_= setup re-seals + // DLM's captured setup template under THIS sessio= n's live ks/riv and + // sends it; `acks` counts the dock's encrypted ws= ub=3D0x45 replies. + // THIS IS THE WALL: on a cold dock `acks` stays 0= -- the dock runs the + // entire plaintext handshake but never engages th= e encrypted CP. let mut edid_out: Option> =3D None; match VinoDriver::send_cp_setup(dev, &session, &mu= t edid_out) { - Ok((n, acks, _wseq_end, _ctr_end)) =3D> { + Ok((n, acks, wseq_end, ctr_end)) =3D> { dev_info!(cdev, "vino: CP setup sent -- {n} messages, = {acks} dock CP acks (wsub=3D0x45)\n"); - // CP engagement gates EP08 video (added i= n a later patch): until - // the dock acks, pushing pixels at it wed= ges the hub. + // CP engagement gates EP08 video: until t= he dock acks, pushing + // pixels at it wedges the hub. CP_ENGAGED.store(acks > 0, core::sync::ato= mic::Ordering::SeqCst); + // Publish the engaged session to the DRM = device so the KMS + // callbacks + // can send runtime CP (mode-set on a mode= set, cursor on motion), + // continuing this keystream. Only when th= e dock actually engaged. + if acks > 0 { + if let Some(d) =3D ddev.as_ref() { + let data: &drm_sink::VinoDrmData = =3D d; + data.publish_session( + &session.ks, &session.riv, wse= q_end, ctr_end, + ); + } + } } Err(e) =3D> dev_info!(cdev, "vino: CP setup in= complete ({e:?}) -- WIP\n"), } + // Cache the dock's EDID on the DRM device (when t= he CP channel + // delivered it) so the connector's get_modes inst= alls the real + // monitor descriptor via the standard DRM EDID he= lpers. + if let (Some(blob), Some(d)) =3D (edid_out, ddev.a= s_ref()) { + let n =3D blob.len(); + let data: &drm_sink::VinoDrmData =3D d; + data.set_edid(blob); + dev_info!(cdev, "vino: cached dock EDID for co= nnector ({n} bytes)\n"); + } } Err(e) =3D> dev_info!(cdev, "vino: HDCP AKE incomplete= ({e:?}) -- WIP\n"), } } Err(e) =3D> dev_info!(cdev, "vino: session init incomplete ({e= :?}) -- WIP\n"), } + // Bring-up attempt finished: allow the live-scanout connector to = report connected + // and let a compositor drive EP08 frames, without racing the hand= shake. + BRINGUP_COMPLETE.store(true, core::sync::atomic::Ordering::SeqCst); + if let Some(d) =3D ddev.as_ref() { + let data: &drm_sink::VinoDrmData =3D d; + data.fire_hotplug(); + dev_info!(cdev, "vino: bring-up complete -- live-scanout conne= ctor now connected\n"); + } } } =20 @@ -1596,16 +1658,59 @@ fn probe<'bound>( return Err(ENODEV); } dev_info!(cdev, "vino: bound D6000 interface {ifnum} (idle -- = control is iface 0)\n"); - return Ok(Self { _intf: intf.into() }); + return Ok(Self { _intf: intf.into(), _ddev: None }); } dev_info!(cdev, "vino: bound DisplayLink D6000 -- plaintext sessio= n bring-up\n"); =20 - // Bring-up is blocking synchronous USB I/O; hand it to the system= workqueue so - // probe() returns immediately and userspace stays responsive. The= work item holds - // a refcounted handle to the interface, so the bulk endpoints out= live probe(); USB - // I/O after an intervening disconnect simply errors and is logged. + // Phase 3: register a real DRM/KMS device on the control interfac= e so the dock + // shows up as a mode-settable `card`/`renderD` node (atomic KMS v= ia the simple + // display pipe, one 1080p virtual connector, GEM-shmem dumb buffe= rs). Non-fatal: + // bring-up still proceeds (and the interface still binds) if any = step fails, so + // a DRM-core hiccup can't regress the USB session work. + // Hold a refcounted handle to the bound interface; one copy goes = into the DRM + // device-private (for the EP08 scanout path), one stays in `VinoD= river`. let intf_ref: ARef =3D intf.into(); - match BringUp::new(intf_ref.clone()) { + // DRM device lifecycle (drm-rust API): allocate an `UnregisteredD= evice`, wire up + // the KMS pipeline on it while still unregistered, then hand it to + // `Registration::new_foreign_owned` (which registers it and ties = its lifetime to + // the bound USB device via devres, returning a borrowed `&Device`= ). + let ddev: Option> =3D + match drm::UnregisteredDevice::::new( + cdev, + drm_sink::VinoDrmData::new(intf_ref.clone()), + ) { + Ok(unreg) =3D> match drm_sink::kms_init(&unreg) { + Ok(()) =3D> match drm::driver::Registration::new_forei= gn_owned(unreg, cdev, 0) { + Ok(reg_dev) =3D> { + dev_info!(cdev, "vino: DRM+KMS device register= ed (card node live, 1080p)\n"); + Some(reg_dev.into()) + } + Err(e) =3D> { + dev_info!(cdev, "vino: DRM registration failed= ({e:?}) -- continuing without card node\n"); + None + } + }, + Err(e) =3D> { + dev_info!(cdev, "vino: KMS init failed ({e:?}) -- = continuing without card node\n"); + None + } + }, + Err(e) =3D> { + dev_info!(cdev, "vino: drm::UnregisteredDevice::new fa= iled ({e:?}) -- continuing\n"); + None + } + }; + + // Bring-up (preamble + HDCP AKE + ~6 s of lockstep CP replay) is = all blocking + // synchronous USB I/O. Running it inline here pins the USB driver= -model probe + // thread while the DRM card node is already registered and live, = which stalled + // the compositor (KWin) on first plug until the dock was physical= ly yanked. Hand + // it to the system workqueue so `probe()` returns immediately and= userspace KMS + // stays responsive. The work item holds refcounted handles to the= interface (for + // the bulk endpoints) and the DRM device (for EDID caching), so t= hey outlive + // `probe()`; USB I/O after an intervening disconnect simply error= s and is logged, + // exactly like any other failed bring-up step. + match BringUp::new(intf_ref.clone(), ddev.clone()) { Ok(work) =3D> { let _ =3D workqueue::system().enqueue(work); dev_info!(cdev, "vino: bring-up queued on system workqueue= \n"); @@ -1613,7 +1718,7 @@ fn probe<'bound>( Err(e) =3D> dev_info!(cdev, "vino: failed to queue bring-up ({= e:?}) -- WIP\n"), } =20 - Ok(Self { _intf: intf_ref }) + Ok(Self { _intf: intf_ref, _ddev: ddev }) } =20 fn disconnect<'bound>(intf: &'bound usb::Interface>, _data: P= in<&Self>) { --=20 2.54.0 From nobody Thu Nov 5 07:36:10 2026 Received: from mail-wm1-f54.google.com (mail-wm1-f54.google.com [209.85.128.54]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DAC5044B687 for ; 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Wed, 17 Jun 2026 08:13:05 -0700 (PDT) Received: from axion.fireburn.co.uk ([137.220.119.72]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49230a9a399sm151019305e9.14.2026.06.17.08.13.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Jun 2026 08:13:05 -0700 (PDT) From: Mike Lothian To: dri-devel@lists.freedesktop.org Cc: Mike Lothian , rust-for-linux@vger.kernel.org, Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Miguel Ojeda , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , linux-kernel@vger.kernel.org Subject: [RFC PATCH 6/7] drm/vino: add DDC/CI brightness/contrast, DPMS power and DFU info Date: Wed, 17 Jun 2026 16:12:43 +0100 Message-ID: <20260617151249.2937-7-mike@fireburn.co.uk> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260617151249.2937-1-mike@fireburn.co.uk> References: <20260617151249.2937-1-mike@fireburn.co.uk> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add monitor controls that ride the same control plane: - DDC/CI Set-VCP builders (cp): brightness (VCP 0x10), contrast (0x12) and power mode (0xD6), tunnelled to the downstream monitor's I2C slave 0x37 over the dock's monitor-I2C bridge; - DRM connector range properties (drm_sink): a 0..=3D100 brightness and contrast property per connector, whose atomic_set_property callback pushes a DDC/CI Set-VCP write to the monitor; - DPMS power (drm_sink): the CRTC enable/disable hooks emit VCP 0xD6 on/off so a blanked output drops the monitor to standby instead of freezing the last frame. All are no-ops until the CP cipher engages (the open blocker), so they are inert on current hardware but correct by construction (the DDC/CI payloads are unit-tested against the VESA MCCS worked examples). Also query the dock's DFU device info at bring-up (firmware version, customer/board id) -- device-level vendor reads independent of the CP channel, useful for diagnostics and confirming the dock firmware revision. Signed-off-by: Mike Lothian Assisted-by: Claude:claude-opus-4-8 [Claude-Code] --- drivers/gpu/drm/vino/cp.rs | 51 +++++++++++ drivers/gpu/drm/vino/drm_sink.rs | 141 ++++++++++++++++++++++++++++++- drivers/gpu/drm/vino/vino.rs | 18 ++++ 3 files changed, 206 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/vino/cp.rs b/drivers/gpu/drm/vino/cp.rs index 2668931d8500..be2bdcf5557c 100644 --- a/drivers/gpu/drm/vino/cp.rs +++ b/drivers/gpu/drm/vino/cp.rs @@ -112,6 +112,57 @@ pub(super) fn set_mode(counter: u16, t: &Timing) -> Re= sult> { Ok(b) } =20 +/// Standard VESA MCCS (Monitor Control Command Set 2.2) VCP feature codes= , driven over +/// DDC/CI. The macOS DisplayLink agent exposes these as per-display brigh= tness/contrast +/// ("Popover did show -- starting DDC/CI communication", `setBrightness`/= `setContrast`); the +/// dock bridges the DDC/CI transaction to the downstream monitor's I2C sl= ave 0x37 -- the same +/// monitor-I2C path the EDID read ([`get_edid_req`]) uses for the 0x50 ED= ID slave. +pub(super) const VCP_BRIGHTNESS: u8 =3D 0x10; +pub(super) const VCP_CONTRAST: u8 =3D 0x12; +/// VCP 0xD6 "Power mode": value 0x01 =3D on, 0x04 =3D off (DPMS-off / har= d standby). Lets DPMS +/// blank the panel backlight instead of freezing the last frame (see [`cr= tc_atomic_disable`]). +pub(super) const VCP_POWER_MODE: u8 =3D 0xd6; +pub(super) const POWER_ON: u16 =3D 0x01; +pub(super) const POWER_OFF: u16 =3D 0x04; + +/// Build a DDC/CI "Set VCP Feature" request: the 7 bytes a DDC/CI host wr= ites to the +/// monitor's I2C slave 0x37, after the 0x6e (=3D 0x37<<1) write address (= VESA DDC/CI 1.1 +/// sec 4.4). Layout: source 0x51, length `0x80 | 4`, opcode 0x03 (Set VCP= ), VCP code, +/// value-hi, value-lo, then an XOR checksum seeded with the destination a= ddress 0x6e. Pure +/// and fully standard, so it is unit-tested byte-exact against the spec +/// ([`super::tests::ddc_ci_set_vcp_checksum`]). +pub(super) fn ddc_ci_set_vcp(vcp: u8, value: u16) -> [u8; 7] { + let body =3D [0x51u8, 0x84, 0x03, vcp, (value >> 8) as u8, value as u8= ]; + let mut chk =3D 0x6eu8; // checksum seed =3D destination slave-write a= ddress (0x37 << 1) + for &x in &body { + chk ^=3D x; + } + [body[0], body[1], body[2], body[3], body[4], body[5], chk] +} + +/// CP message that tunnels a DDC/CI Set-VCP write to the downstream monit= or -- the brightness, +/// contrast and DPMS-power controls the macOS/Windows agents drive over "= DDC/CI communication". +/// The dock's monitor-I2C bridge is the same one the EDID read uses, so t= his is modelled as the +/// WRITE companion to the `0x15/0x21` EDID read: `id=3D0x15 sub=3D0x22`, = carrying the I2C slave +/// (0x37) + payload length at off20 and the 7-byte DDC/CI Set-VCP payload= at off22. +/// +/// The `id`/`sub` and payload offset are **inferred** from the EDID-read = pairing -- the write +/// transaction was never captured (it only fires once a monitor is active= ly driven, i.e. past +/// the CP wall), so re-check against a capture once CP engages. The DDC/C= I bytes themselves +/// ([`ddc_ci_set_vcp`]) are standard and verified. +pub(super) fn ddc_set_vcp(counter: u16, vcp: u8, value: u16) -> Result> { + let payload =3D ddc_ci_set_vcp(vcp, value); + let mut b =3D KVec::with_capacity(32, GFP_KERNEL)?; + header(&mut b, 0x15, 0x22, counter)?; + pad_to(&mut b, 20)?; + // off20: monitor DDC/CI I2C slave (0x37) + DDC/CI payload length. + b.extend_from_slice(&[0x37, payload.len() as u8], GFP_KERNEL)?; + // off22: the DDC/CI Set-VCP bytes (same off22 convention as the EDID = payload). + b.extend_from_slice(&payload, GFP_KERNEL)?; + pad_to(&mut b, 32)?; + Ok(b) +} + /// EDID base-block sanity check: length, the `00 FF..FF 00` magic, and th= e 1-byte /// checksum (all 128 base bytes sum to 0 mod 256). A corrupt blob must ne= ver drive a /// mode-set, so [`timing_from_edid`] rejects anything that fails this. diff --git a/drivers/gpu/drm/vino/drm_sink.rs b/drivers/gpu/drm/vino/drm_si= nk.rs index afbf883fba36..bcc871958a8a 100644 --- a/drivers/gpu/drm/vino/drm_sink.rs +++ b/drivers/gpu/drm/vino/drm_sink.rs @@ -129,6 +129,11 @@ pub(super) struct Head { /// One-shot: this head's cursor `create` (sprite dimensions) was sent= before its first /// image upload (per head -- the global one would skip head 1's creat= e). cursor_primed: core::sync::atomic::AtomicBool, + /// Last DDC/CI brightness/contrast (0..=3D100) set on this head's mon= itor via the connector + /// properties; replayed on DPMS-on. Stored here (not in connector sta= te) because DDC/CI is + /// a side-band action on the physical monitor, not part of the atomic= scanout pipeline. + brightness: core::sync::atomic::AtomicU32, + contrast: core::sync::atomic::AtomicU32, #[pin] scanout: Mutex, /// This head's downstream-monitor EDID (`None` until the CP channel d= elivers it). Only @@ -167,6 +172,8 @@ fn z() -> impl PinInit, Error> { try_pin_init!(Self { index, cursor_primed: core::sync::atomic::AtomicBool::new(false), + brightness: core::sync::atomic::AtomicU32::new(100), + contrast: core::sync::atomic::AtomicU32::new(100), scanout <- new_mutex!(ScanoutState { enc: None, cur: VVec::new(), @@ -239,6 +246,12 @@ pub(super) struct VinoDrmData { encoder_funcs: Opaque, #[pin] mode_cfg_funcs: Opaque, + /// The custom 0..=3D100 connector range properties for DDC/CI brightn= ess/contrast, created + /// and attached in [`kms_init`]. Stored so the connector `atomic_set_= property` / + /// `atomic_get_property` callbacks can identify them by pointer. Writ= ten once during + /// single-threaded probe, read-only thereafter (`AtomicPtr` for `Sync= ` without `unsafe`). + brightness_prop: core::sync::atomic::AtomicPtr, + contrast_prop: core::sync::atomic::AtomicPtr, } =20 // SAFETY: the embedded C KMS objects are written only during single-threa= ded @@ -278,6 +291,8 @@ fn z() -> impl PinInit, Error> { cursor_helper <- z(), encoder_funcs <- z(), mode_cfg_funcs <- z(), + brightness_prop: core::sync::atomic::AtomicPtr::new(ptr::null_= mut()), + contrast_prop: core::sync::atomic::AtomicPtr::new(ptr::null_mu= t()), }) } =20 @@ -365,6 +380,14 @@ pub(super) fn send_cp( link.counter =3D link.counter.wrapping_add(1); Ok(()) } + + /// Push a DDC/CI Set-VCP write to a head's downstream monitor (bright= ness, contrast or + /// DPMS power). Wraps [`super::cp::ddc_set_vcp`] (`id=3D0x15`); a no-= op until the cipher is + /// engaged. Used by the brightness/contrast connector properties and = by DPMS in the CRTC + /// enable/disable callbacks. + pub(super) fn set_vcp(&self, head_index: u8, vcp: u8, value: u16) -> R= esult { + self.send_cp(head_index, 0x15, 0, |ctr| super::cp::ddc_set_vcp(ctr= , vcp, value)) + } } =20 /// GEM object inner data. Empty: the shmem-backed `drm::gem::shmem::Objec= t` (which @@ -637,6 +660,11 @@ fn install_edid(connector: *mut bindings::drm_connecto= r, blob: &[u8]) -> i32 { if let Err(e) =3D data.send_cp(head.index, 0x48, 16, |ctr| super::cp::= set_mode(ctr, &timing)) { pr_warn!("vino: head{} runtime mode-set send failed ({e:?})\n", he= ad.index); } + // Bring the monitor out of DPMS standby (DDC/CI VCP 0xD6 =3D on). Inf= erred wire (see + // `cp::ddc_set_vcp`); a no-op until CP engages, and re-applies the us= er's brightness. + let _ =3D data.set_vcp(head.index, super::cp::VCP_POWER_MODE, super::c= p::POWER_ON); + let b =3D head.brightness.load(core::sync::atomic::Ordering::Relaxed); + let _ =3D data.set_vcp(head.index, super::cp::VCP_BRIGHTNESS, b as u16= ); } =20 /// CRTC `.atomic_disable`: the display is turning off. @@ -646,10 +674,12 @@ fn install_edid(connector: *mut bindings::drm_connect= or, blob: &[u8]) -> i32 { /// re-enable (DPMS-on) re-inits the encoder and sends a **full keyframe**= rather than diffing /// against a shadow the dock may have dropped while blanked, and re-uploa= ds the cursor sprite. /// -/// The dock holds the last frame when video stops (it has its own scanout= buffer), so the -/// monitor freezes the last image rather than going black; a true backlig= ht-standby would need -/// a dock power command that is not decoded (DLM's `Standby`/`Suspend`/`T= empPowerOff` are -/// internal, vtable-dispatched events with no wire frame -- the same dead= -end as gamma). +/// The dock holds the last frame when video stops (it has its own scanout= buffer), so video +/// alone freezes the last image rather than going black. To actually blan= k the panel we send a +/// DDC/CI power-off (VCP 0xD6 =3D off) to the monitor over the same monit= or-I2C bridge the EDID +/// read uses -- the standard MCCS power control the macOS/Windows agents = drive (DLM's +/// `Standby`/`Suspend`/`TempPowerOff` are the host-internal names for it)= . Inferred wire (see +/// [`super::cp::ddc_set_vcp`]); a no-op until CP engages. unsafe extern "C" fn crtc_atomic_disable( crtc: *mut bindings::drm_crtc, _state: *mut bindings::drm_atomic_commit, @@ -671,6 +701,10 @@ fn install_edid(connector: *mut bindings::drm_connecto= r, blob: &[u8]) -> i32 { } head.cursor_primed .store(false, core::sync::atomic::Ordering::SeqCst); + // DPMS-off: blank the monitor backlight via DDC/CI (VCP 0xD6 =3D off)= rather than leaving + // the last frame frozen on the panel. Inferred wire (see `cp::ddc_set= _vcp`); no-op until + // CP engages. + let _ =3D data.set_vcp(head.index, super::cp::VCP_POWER_MODE, super::c= p::POWER_OFF); pr_info!("vino: KMS CRTC disable -- head{} display OFF (scanout stoppe= d)\n", head.index); } =20 @@ -1182,6 +1216,9 @@ pub(super) fn kms_init( Some(bindings::drm_atomic_helper_connector_duplicate_state); (*cf).atomic_destroy_state =3D Some(bindings::drm_atomic_helper_connector_destroy_state); + // Custom DDC/CI brightness/contrast properties (see `connector_at= omic_set_property`). + (*cf).atomic_set_property =3D Some(connector_atomic_set_property); + (*cf).atomic_get_property =3D Some(connector_atomic_get_property); (*data.conn_helper.get()).get_modes =3D Some(get_modes); // Prune any single mode above the per-head pixel-clock ceiling (~= 4K@60). (*data.conn_helper.get()).mode_valid =3D Some(mode_valid); @@ -1216,6 +1253,26 @@ pub(super) fn kms_init( (*data.encoder_funcs.get()).destroy =3D Some(bindings::drm_encoder= _cleanup); =20 // Build each head's objects (connector + primary/cursor planes + = CRTC + encoder). + // DDC/CI brightness/contrast: one 0..=3D100 range property each, = created on the device + // and attached to every connector in `build_head`. Non-fatal: a N= ULL property just + // means the knob is absent (kept in the AtomicPtr as NULL, ignore= d by the callbacks). + let bp =3D bindings::drm_property_create_range( + raw, + 0, + c"brightness".as_ptr().cast(), + 0, + 100, + ); + data.brightness_prop.store(bp, core::sync::atomic::Ordering::Relax= ed); + let cp =3D bindings::drm_property_create_range( + raw, + 0, + c"contrast".as_ptr().cast(), + 0, + 100, + ); + data.contrast_prop.store(cp, core::sync::atomic::Ordering::Relaxed= ); + for head in data.heads() { build_head(raw, data, head)?; } @@ -1322,10 +1379,86 @@ unsafe fn build_head(raw: *mut bindings::drm_device= , data: &VinoDrmData, head: & if rc !=3D 0 { pr_warn!("vino: head{} rotation property unavailable ({rc})\n"= , head.index); } + + // Attach the shared DDC/CI brightness/contrast properties to this= connector, each at + // its default of 100 (=3D no attenuation). The callbacks store th= e value per head and + // fire the DDC/CI write (see `connector_atomic_set_property`). + let bp =3D data.brightness_prop.load(core::sync::atomic::Ordering:= :Relaxed); + if !bp.is_null() { + bindings::drm_object_attach_property(&mut (*conn).base, bp, 10= 0); + } + let cp =3D data.contrast_prop.load(core::sync::atomic::Ordering::R= elaxed); + if !cp.is_null() { + bindings::drm_object_attach_property(&mut (*conn).base, cp, 10= 0); + } } Ok(()) } =20 +/// Connector `.atomic_set_property`: handle the custom DDC/CI brightness/= contrast properties +/// (the standard properties are handled by the DRM core, which never call= s us for them). On a +/// value change we store it on the head and immediately push a DDC/CI Set= -VCP write to the +/// monitor -- DDC/CI is a side-band action on the physical panel, not par= t of the atomic +/// scanout state, so it is applied here rather than threaded through conn= ector state. Returns +/// `-EINVAL` for any other property so the core reports it as unknown. +unsafe extern "C" fn connector_atomic_set_property( + connector: *mut bindings::drm_connector, + _state: *mut bindings::drm_connector_state, + property: *mut bindings::drm_property, + val: u64, +) -> i32 { + // SAFETY: `connector` is a valid connector embedded in our DRM device= -private. + let dev =3D unsafe { (*connector).dev }; + // SAFETY: `dev` is our live, registered drm_device. + let data: &VinoDrmData =3D unsafe { VinoDrmDevice::from_raw(dev) }; + let Some(head) =3D data.head_by_connector(connector) else { + return EINVAL.to_errno(); + }; + let bp =3D data.brightness_prop.load(core::sync::atomic::Ordering::Rel= axed); + let cp =3D data.contrast_prop.load(core::sync::atomic::Ordering::Relax= ed); + let v =3D val.min(100) as u32; + let (slot, vcp) =3D if property =3D=3D bp && !bp.is_null() { + (&head.brightness, super::cp::VCP_BRIGHTNESS) + } else if property =3D=3D cp && !cp.is_null() { + (&head.contrast, super::cp::VCP_CONTRAST) + } else { + return EINVAL.to_errno(); + }; + if slot.swap(v, core::sync::atomic::Ordering::Relaxed) !=3D v { + let _ =3D data.set_vcp(head.index, vcp, v as u16); + } + 0 +} + +/// Connector `.atomic_get_property`: read back the stored DDC/CI brightne= ss/contrast (the +/// values round-trip through the head atomics set by [`connector_atomic_s= et_property`]). +unsafe extern "C" fn connector_atomic_get_property( + connector: *mut bindings::drm_connector, + _state: *const bindings::drm_connector_state, + property: *mut bindings::drm_property, + val: *mut u64, +) -> i32 { + // SAFETY: `connector` is a valid connector embedded in our DRM device= -private. + let dev =3D unsafe { (*connector).dev }; + // SAFETY: `dev` is our live, registered drm_device. + let data: &VinoDrmData =3D unsafe { VinoDrmDevice::from_raw(dev) }; + let Some(head) =3D data.head_by_connector(connector) else { + return EINVAL.to_errno(); + }; + let bp =3D data.brightness_prop.load(core::sync::atomic::Ordering::Rel= axed); + let cp =3D data.contrast_prop.load(core::sync::atomic::Ordering::Relax= ed); + let slot =3D if property =3D=3D bp && !bp.is_null() { + &head.brightness + } else if property =3D=3D cp && !cp.is_null() { + &head.contrast + } else { + return EINVAL.to_errno(); + }; + // SAFETY: the DRM core passes a valid `*mut u64` output pointer. + unsafe { *val =3D slot.load(core::sync::atomic::Ordering::Relaxed) as = u64 }; + 0 +} + /// Thin wrapper so the `unsafe` block above reads cleanly. unsafe fn drm_mode_config_reset(raw: *mut bindings::drm_device) { // SAFETY: `raw` is a valid drm_device with mode_config initialised. diff --git a/drivers/gpu/drm/vino/vino.rs b/drivers/gpu/drm/vino/vino.rs index 1091dcc992c7..ee63ce7e4625 100644 --- a/drivers/gpu/drm/vino/vino.rs +++ b/drivers/gpu/drm/vino/vino.rs @@ -385,6 +385,24 @@ fn bring_up(dev: &usb::Device) -> Result { Ok(()) =3D> pr_info!("vino: step device-open 0xfc(iface1) OK = =3D {:02x?}\n", probe3), Err(e) =3D> pr_info!("vino: step device-open 0xfc(iface1) non-= fatal ({e:?})\n"), } + // DFU firmware-version query, matching DLM / the macOS+Windows dr= ivers' + // DfuGetVmmDeviceFirmwareVersion: vendor IN bmRequestType=3D0xc1 = bRequest=3D0xfd wIndex=3D1, + // a 6-byte version blob (the reference driver's request-size tabl= e: 0xfb=3D4 customer/board, + // 0xfc=3D3 device-type, 0xfd=3D6 firmware-version, 0xfe=3D16 desc= riptor). This is a device-level + // DFU read, independent of the CP channel, so it works regardless= of CP engagement -- handy + // for diagnostics and confirming the dock firmware revision. + let mut fw_ver =3D [0u8; 6]; + match dev.control_recv(0xfd, VENDOR_IN_IFACE, 0, 1, &mut fw_ver, t= imeout()) { + Ok(()) =3D> pr_info!("vino: dock DFU firmware version =3D {:02= x?}\n", fw_ver), + Err(e) =3D> pr_info!("vino: device-open 0xfd(firmware-version)= non-fatal ({e:?})\n"), + } + // DFU customer/board id (DfuGetVmmDeviceCustomerAndBoardId): bReq= uest=3D0xfb, 4-byte blob. + let mut cust_board =3D [0u8; 4]; + match dev.control_recv(0xfb, VENDOR_IN_IFACE, 0, 1, &mut cust_boar= d, timeout()) { + Ok(()) =3D> pr_info!("vino: dock DFU customer/board id =3D {:0= 2x?}\n", cust_board), + Err(e) =3D> pr_info!("vino: device-open 0xfb(customer/board) n= on-fatal ({e:?})\n"), + } + // EXPERIMENT (2026-06-16): replay DLM's repeated STRING-descripto= r reads at device-open. // Timing analysis of the paired cold capture (captures/paired-col= dbus-20260615-220311) // shows DLM, beyond the distinct descriptor SET vino already issu= es, re-reads STRING idx0 --=20 2.54.0 From nobody Thu Nov 5 07:36:10 2026 Received: from mail-wm1-f49.google.com (mail-wm1-f49.google.com [209.85.128.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3C34E2F60CC for ; 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Wed, 17 Jun 2026 08:13:07 -0700 (PDT) Received: from axion.fireburn.co.uk ([137.220.119.72]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49230a9a399sm151019305e9.14.2026.06.17.08.13.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Jun 2026 08:13:06 -0700 (PDT) From: Mike Lothian To: dri-devel@lists.freedesktop.org Cc: Mike Lothian , rust-for-linux@vger.kernel.org, Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Miguel Ojeda , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , linux-kernel@vger.kernel.org Subject: [RFC PATCH 7/7] drm/vino: add KUnit self-tests for the protocol and crypto paths Date: Wed, 17 Jun 2026 16:12:44 +0100 Message-ID: <20260617151249.2937-8-mike@fireburn.co.uk> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260617151249.2937-1-mike@fireburn.co.uk> References: <20260617151249.2937-1-mike@fireburn.co.uk> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add offline KUnit self-tests for the pure protocol builders/parsers and the crypto bindings the control plane relies on. The crypto cases are published known-answer vectors (FIPS-197 AES-128, RFC 4493 AES-CMAC) and a live seal round-trip; the rest pin wire layout, EDID timing extraction, the WHT codec stages and the DDC/CI Set-VCP encoding that have no hardware oracle. Gated behind CONFIG_KUNIT, so they have zero effect on a production build; run with a KUnit-enabled kernel. Signed-off-by: Mike Lothian Assisted-by: Claude:claude-opus-4-8 [Claude-Code] --- drivers/gpu/drm/vino/vino.rs | 299 +++++++++++++++++++++++++++++++++++ 1 file changed, 299 insertions(+) diff --git a/drivers/gpu/drm/vino/vino.rs b/drivers/gpu/drm/vino/vino.rs index ee63ce7e4625..2d22c3f822cd 100644 --- a/drivers/gpu/drm/vino/vino.rs +++ b/drivers/gpu/drm/vino/vino.rs @@ -1752,3 +1752,302 @@ fn disconnect<'bound>(intf: &'bound usb::Interface<= Core<'_>>, _data: Pin<&Self>) description: "DisplayLink DL3 (Vino) open driver", license: "GPL v2", } + +/// Build a minimal valid 128-byte EDID with a 1920x1080@60 detailed timin= g at base-block +/// offset `dtd_at` (54 =3D preferred slot), a correct checksum, and the s= tandard magic. +#[cfg(CONFIG_KUNIT =3D "y")] +fn mk_test_edid(dtd_at: usize) -> [u8; 128] { + let mut e =3D [0u8; 128]; + e[..8].copy_from_slice(&[0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x0= 0]); + // 1920x1080@60: pclk 14850 (148.5 MHz, 10 kHz units); hblank 280, vbl= ank 45; + // hsync_front 88, hsync_width 44, vsync_front 4, vsync_width 5. + let dtd: [u8; 18] =3D [ + 0x02, 0x3a, // pixel clock 0x3a02 LE + 0x80, 0x18, 0x71, // hactive 1920 / hblank 280 (high nibbles in by= te 4) + 0x38, 0x2d, 0x40, // vactive 1080 / vblank 45 (high nibbles in byt= e 7) + 0x58, 0x2c, 0x45, 0x00, // hsync/vsync front+width + 0, 0, 0, 0, 0, 0, // trailing flags (DTD is 18 bytes total) + ]; + e[dtd_at..dtd_at + 18].copy_from_slice(&dtd); + let s =3D e[..127].iter().fold(0u8, |a, &b| a.wrapping_add(b)); + e[127] =3D 0u8.wrapping_sub(s); // base-block checksum: all 128 bytes = sum to 0 + e +} + +/// Offline self-tests for the pure protocol builders/parsers and the cryp= to bindings the +/// control plane relies on. Gated behind `CONFIG_KUNIT` (the macro adds t= he cfg), so they +/// have zero effect on a production build; run with a KUnit-enabled kerne= l. The crypto cases +/// are published known-answer vectors (FIPS-197 AES-128, RFC 4493 AES-CMA= C); the seal case is +/// a live round-trip; the rest pin wire layout and EDID parsing that have= no hardware oracle. +#[kunit_tests(vino_protocol)] +mod tests { + use super::*; + use kernel::error::code::EINVAL; + + #[test] + fn aes128_ecb_fips197_kat() -> Result { + // FIPS-197 / NIST SP800-38A F.1.1 AES-128 ECB known-answer vector. + let key =3D [ + 0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x= 15, 0x88, 0x09, 0xcf, + 0x4f, 0x3c, + ]; + let pt =3D [ + 0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x= 7e, 0x11, 0x73, 0x93, + 0x17, 0x2a, + ]; + assert_eq!( + crypto::aes128_ecb(&key, &pt)?, + [ + 0x3a, 0xd7, 0x7b, 0xb4, 0x0d, 0x7a, 0x36, 0x60, 0xa8, 0x9e= , 0xca, 0xf3, 0x24, 0x66, + 0xef, 0x97, + ] + ); + Ok(()) + } + + #[test] + fn aes_cmac_rfc4493_kat() -> Result { + // RFC 4493 sec 4 AES-CMAC test vectors (same key as above). + let key =3D [ + 0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x= 15, 0x88, 0x09, 0xcf, + 0x4f, 0x3c, + ]; + assert_eq!( + crypto::aes_cmac(&key, &[])?, + [ + 0xbb, 0x1d, 0x69, 0x29, 0xe9, 0x59, 0x37, 0x28, 0x7f, 0xa3= , 0x7d, 0x12, 0x9b, 0x75, + 0x67, 0x46, + ] + ); + let msg =3D [ + 0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x= 7e, 0x11, 0x73, 0x93, + 0x17, 0x2a, + ]; + assert_eq!( + crypto::aes_cmac(&key, &msg)?, + [ + 0x07, 0x0a, 0x16, 0xb4, 0x6b, 0x4d, 0x41, 0x44, 0xf7, 0x9b= , 0xdd, 0x9d, 0xd0, 0x4a, + 0x28, 0x7c, + ] + ); + Ok(()) + } + + #[test] + fn seal_livemac_roundtrip() -> Result { + // A sealed CP frame must decrypt back to its content under the IN= riv, and its + // appended tag must equal a fresh Dl3Cmac over the ciphertext (en= crypt-then-MAC). + let ks =3D [ + 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0x= aa, 0xbb, 0xcc, 0xdd, + 0xee, 0xff, + ]; + let riv =3D [0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17]; + let content =3D [0xa5u8; 32]; + let mut hdr =3D [0u8; 16]; + hdr[12..16].copy_from_slice(&4u32.to_le_bytes()); // wire_seq =3D 4 + let frame =3D cp::seal_livemac(&ks, &riv, &hdr, &content)?; + assert_eq!(frame.len(), 16 + 32 + 16); + let ct =3D &frame[16..16 + 32]; + assert_eq!(&cp::open_in(&ks, &cp::in_riv(&riv), 4, ct)?[..], &cont= ent[..]); + assert_eq!(&frame[16 + 32..], &cp::dl3cmac_tag(&ks, &riv, 4, ct)?[= ..]); + Ok(()) + } + + #[test] + fn aux_for_id_constants() { + // The CP header `aux` field is a per-inner-id constant, not body_= len/4. + assert_eq!(cp::aux_for_id(0x14, 48), 0x0a); + assert_eq!(cp::aux_for_id(0x15, 32), 0x09); + assert_eq!(cp::aux_for_id(0x48, 96), 0x06); + assert_eq!(cp::aux_for_id(0x99, 40), 10); // unknown id falls back= to body_len/4 + } + + #[test] + fn edid_timing_parse_and_validate() { + // A well-formed EDID yields the DTD timing; a bad checksum is rej= ected; a leading + // monitor descriptor (pclk 0) does not hide the preferred timing = in a later slot. + let edid =3D mk_test_edid(54); + let t =3D cp::timing_from_edid(&edid).expect("valid EDID parses"); + assert_eq!(t.hactive, 1920); + assert_eq!(t.vactive, 1080); + assert_eq!(t.refresh_hz, 60); + assert_eq!(t.pixel_clock_10khz, 14850); + + let mut bad =3D edid; + bad[127] ^=3D 0xff; + assert!(cp::timing_from_edid(&bad).is_none(), "bad checksum reject= ed"); + + let scanned =3D mk_test_edid(72); // off54 left as a zero (monitor= ) descriptor + assert_eq!( + cp::timing_from_edid(&scanned).expect("scans past off54").hact= ive, + 1920 + ); + } + + #[test] + fn edid_reply_guards() -> Result { + // The pre-decrypt guards reject non-EDID frames without touching = the cipher. + let ks =3D [0u8; 16]; + let riv =3D [0u8; 8]; + assert!(cp::parse_edid_from_reply(&ks, &riv, &[0u8; 10])?.is_none(= )); + let mut wrong_sub =3D [0u8; 20]; + wrong_sub[8] =3D 0x44; // wire sub !=3D 0x45 + assert!(cp::parse_edid_from_reply(&ks, &riv, &wrong_sub)?.is_none(= )); + Ok(()) + } + + #[test] + fn rgb565_packing() { + assert_eq!(video::rgb565(0xff, 0x00, 0x00), 0xf800); + assert_eq!(video::rgb565(0x00, 0xff, 0x00), 0x07e0); + assert_eq!(video::rgb565(0x00, 0x00, 0xff), 0x001f); + let _ =3D EINVAL; // silence unused import on configs without the = assert paths + } + + #[test] + fn cursor_messages_structure() -> Result { + // Create: id=3D0x1b sub=3D0x42, `00 02 00` marker + w,h at off20. + let c =3D cp::cursor_create(7, 64, 64)?; + assert_eq!(c.len(), 27); + assert_eq!(&c[0..6], &[0x1b, 0x00, 0x42, 0x00, 0x07, 0x00]); // id= , sub, counter (LE) + assert_eq!(&c[20..23], &[0x00, 0x02, 0x00]); // marker + assert_eq!(u16::from_le_bytes([c[23], c[24]]), 64); // width + assert_eq!(u16::from_le_bytes([c[25], c[26]]), 64); // height + + // Move: id=3D0x1a sub=3D0x43, head@22, flag@23, X@24, Y@26 (LE). + let m =3D cp::cursor_move(9, 1, 0x0140, 0x00f0)?; + assert_eq!(m.len(), 28); + assert_eq!(&m[0..4], &[0x1a, 0x00, 0x43, 0x00]); // id, sub + assert_eq!(m[22], 1); // head id + assert_eq!(u16::from_le_bytes([m[24], m[25]]), 0x0140); // X + assert_eq!(u16::from_le_bytes([m[26], m[27]]), 0x00f0); // Y + + // Image: create-style 27-byte header + w*h*4 BGRA bitmap; wrong-s= ize input rejected. + let bitmap =3D KVec::from_elem(0xabu8, 64 * 64 * 4, GFP_KERNEL)?; + let img =3D cp::cursor_image(3, 64, 64, &bitmap)?; + assert_eq!(img.len(), 27 + 64 * 64 * 4); + assert_eq!(&img[0..4], &[0x1c, 0x00, 0x41, 0x00]); // id, sub + assert_eq!(img[27], 0xab); // bitmap begins right after the 27-byt= e header + assert!(cp::cursor_image(3, 64, 64, &[0u8; 16]).is_err()); // wron= g bitmap length + Ok(()) + } + + #[test] + fn timing_from_drm_mode_1080p60() { + // CEA 1920x1080@60: clock 148.5 MHz, h 2008/2052/2200, v 1084/108= 9/1125. + let mut m =3D bindings::drm_display_mode::default(); + m.clock =3D 148_500; // kHz + m.hdisplay =3D 1920; + m.hsync_start =3D 2008; + m.hsync_end =3D 2052; + m.htotal =3D 2200; + m.vdisplay =3D 1080; + m.vsync_start =3D 1084; + m.vsync_end =3D 1089; + m.vtotal =3D 1125; + // SAFETY: `m` is a fully-initialised local drm_display_mode. + let t =3D unsafe { cp::timing_from_drm_mode(&m) }; + assert_eq!(t.hactive, 1920); + assert_eq!(t.hblank, 280); // htotal - hdisplay + assert_eq!(t.hsync_front, 88); // hsync_start - hdisplay + assert_eq!(t.hsync_width, 44); // hsync_end - hsync_start + assert_eq!(t.vactive, 1080); + assert_eq!(t.vblank, 45); // vtotal - vdisplay + assert_eq!(t.vsync_front, 4); + assert_eq!(t.vsync_width, 5); + assert_eq!(t.pixel_clock_10khz, 14_850); // clock(kHz) / 10 + assert_eq!(t.refresh_hz, 60); // via drm_mode_vrefresh + } + + #[test] + fn rotation_pixel_mapping() { + use bindings::{ + DRM_MODE_REFLECT_X, DRM_MODE_ROTATE_0, DRM_MODE_ROTATE_180, DR= M_MODE_ROTATE_270, + DRM_MODE_ROTATE_90, + }; + // Source 2x3 (sw=3D2, sh=3D3). 0deg is identity; 180deg mirrors b= oth axes. + assert_eq!(drm_sink::rot_src(DRM_MODE_ROTATE_0, 0, 0, 2, 3), (0, 0= )); + assert_eq!(drm_sink::rot_src(DRM_MODE_ROTATE_0, 1, 2, 2, 3), (1, 2= )); + assert_eq!(drm_sink::rot_src(DRM_MODE_ROTATE_180, 0, 0, 2, 3), (1,= 2)); + assert_eq!(drm_sink::rot_src(DRM_MODE_ROTATE_180, 1, 2, 2, 3), (0,= 0)); + // 90deg: output dims are (sh,sw)=3D(3,2); (dx,dy) -> (dy, sh-1-dx= ). + assert_eq!(drm_sink::rot_src(DRM_MODE_ROTATE_90, 0, 0, 2, 3), (0, = 2)); + assert_eq!(drm_sink::rot_src(DRM_MODE_ROTATE_90, 2, 1, 2, 3), (1, = 0)); + // 270deg: (dx,dy) -> (sw-1-dy, dx). + assert_eq!(drm_sink::rot_src(DRM_MODE_ROTATE_270, 0, 0, 2, 3), (1,= 0)); + assert_eq!(drm_sink::rot_src(DRM_MODE_ROTATE_270, 2, 1, 2, 3), (0,= 2)); + // Reflect-X composes on top of the rotation (here identity): sx -= > sw-1-sx. + assert_eq!(drm_sink::rot_src(DRM_MODE_ROTATE_0 | DRM_MODE_REFLECT_= X, 0, 0, 2, 3), (1, 0)); + } + + #[test] + fn wht_colour_and_quantize() { + use video::wht; + // Exact colour transform: white -> Y=3D16320, achromatic -> Cb=3D= Cr=3D0. + assert_eq!(wht::colour(255, 255, 255), (16320, 0, 0)); + assert_eq!(wht::colour(128, 128, 128), (128 * 64, 0, 0)); // gray:= chroma zero + assert_eq!(wht::colour(255, 0, 0), (16 * 255, 64 * 255, 0)); // re= d: Cb>0, Cr=3D0 + // The documented ground-truth vector: white Y_DC=3D16320 quantize= s (DC, position 0) to 1020. + assert_eq!(wht::quantize(16320, 0), 1020); + // AC clamps to the 12-bit signed long-token range. + assert_eq!(wht::quantize(1_000_000, 16), 2047); + assert_eq!(wht::quantize(-1_000_000, 16), -2048); + } + + #[test] + fn wht_transform_uniform() { + use video::wht; + // A uniform block: DC =3D the per-pixel value, every AC coefficie= nt =3D 0 (VIDEO.md invariant). + let block =3D [16320i32; wht::BLOCK]; + let c =3D wht::transform(&block); + assert_eq!(c[0], 16320); // DC =3D mean =3D the uniform value + assert!(c[1..].iter().all(|&x| x =3D=3D 0)); // AC all zero + // End-to-end: white pixel -> Y plane -> WHT DC -> quantize -> 102= 0. + let (y, _, _) =3D wht::colour(255, 255, 255); + assert_eq!(wht::quantize(wht::transform(&[y; wht::BLOCK])[0], 0), = 1020); + } + + #[test] + fn wht_token_bitstream() -> Result { + use video::wht::TokenWriter; + // 16-bit zero pad, then short tokens 5 (00101) and 30 (11110), ze= ro-padded to a byte: + // 0000000000000000 00101 11110 000000 =3D 0x00 0x00 0x2F 0x80. + let mut w =3D TokenWriter::new()?; + w.token(5)?; + w.token(30)?; + assert_eq!(&w.finish()?[..], &[0x00, 0x00, 0x2f, 0x80]); + // A value > 30 escapes to a 17-bit long token: 16 pad + 17 + byte= -pad =3D 5 bytes. + let mut w =3D TokenWriter::new()?; + w.token(100)?; + assert_eq!(w.finish()?.len(), 5); + Ok(()) + } + + #[test] + fn ddc_ci_set_vcp_checksum() { + // VESA DDC/CI 1.1 sec 4.4 worked example: Set brightness (VCP 0x1= 0) to 50 (0x0032). + // Bytes after the 0x6e write address: 51 84 03 10 00 32, checksum= =3D XOR incl. 0x6e. + let p =3D cp::ddc_ci_set_vcp(cp::VCP_BRIGHTNESS, 50); + assert_eq!(&p[..6], &[0x51, 0x84, 0x03, 0x10, 0x00, 0x32]); + let want =3D 0x6e ^ 0x51 ^ 0x84 ^ 0x03 ^ 0x10 ^ 0x00 ^ 0x32; + assert_eq!(p[6], want); + // The checksum makes the XOR of {dest, source, len, opcode, vcp, = hi, lo, chk} zero. + assert_eq!(0x6eu8 ^ p.iter().fold(0u8, |a, &b| a ^ b), 0); + // Contrast (0x12) and the power VCP (0xd6 =3D off) carry their co= des/values verbatim. + assert_eq!(cp::ddc_ci_set_vcp(cp::VCP_CONTRAST, 0x0140)[3..6], [0x= 12, 0x01, 0x40]); + assert_eq!(cp::ddc_ci_set_vcp(cp::VCP_POWER_MODE, cp::POWER_OFF)[3= ..6], [0xd6, 0x00, 0x04]); + } + + #[test] + fn ddc_set_vcp_message_structure() -> Result { + // CP wrapper: id=3D0x15 sub=3D0x22, counter (LE) at off4, I2C sla= ve 0x37 + len 7 at off20, + // the 7-byte DDC/CI Set-VCP payload at off22, padded to a 32-byte= block. + let m =3D cp::ddc_set_vcp(0x11, cp::VCP_BRIGHTNESS, 75)?; + assert_eq!(m.len(), 32); + assert_eq!(&m[0..6], &[0x15, 0x00, 0x22, 0x00, 0x11, 0x00]); // id= , sub, counter (LE) + assert_eq!(&m[20..22], &[0x37, 7]); // monitor DDC/CI I2C slave + = payload length + assert_eq!(&m[22..29], &cp::ddc_ci_set_vcp(cp::VCP_BRIGHTNESS, 75)= ); // DDC/CI payload + assert_eq!(&m[29..32], &[0, 0, 0]); // block padding + Ok(()) + } +} --=20 2.54.0