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charset="utf-8" Nova core will be used to export core functionality to other drivers which will bind to it via auxiliary bus devices. Add a NovaCoreApi type which drivers can use to call nova-core methods. Auxiliary bus drivers can obtain a handle to call nova-core methods on a particular GPU using NovaCoreApi::of(). This takes a reference to a bound auxiliary bus device and returns a handle to NovaCoreApi. Signed-off-by: Alistair Popple --- Changes since v2: - Add accidentally dropped TODO comment Changes since v1: - Rework unsafe pin-init to make safety comments clearer, suggested by Danilo. - s/allow(dead_code)/expect(unused)/ --- drivers/gpu/nova-core/api.rs | 29 ++++++++++++++++++++ drivers/gpu/nova-core/driver.rs | 44 ++++++++++++++++++++++-------- drivers/gpu/nova-core/gsp/hal.rs | 2 +- drivers/gpu/nova-core/nova_core.rs | 1 + 4 files changed, 64 insertions(+), 12 deletions(-) create mode 100644 drivers/gpu/nova-core/api.rs diff --git a/drivers/gpu/nova-core/api.rs b/drivers/gpu/nova-core/api.rs new file mode 100644 index 000000000000..610cfc01111e --- /dev/null +++ b/drivers/gpu/nova-core/api.rs @@ -0,0 +1,29 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! Nova-core auxbus data. Contains all the methods used by the auxbus dri= vers +//! to interact with nova-core. + +use core::pin::Pin; + +use kernel::{ + auxiliary, + device::Bound, + prelude::*, + types::CovariantForLt, // +}; + +use crate::gpu::Gpu; + +/// API handle for the auxiliary bus child drivers to interact with nova-c= ore. +pub struct NovaCoreApi<'bound> { + #[expect(unused)] + pub(crate) gpu: Pin<&'bound Gpu<'bound>>, +} + +impl NovaCoreApi<'_> { + /// Obtain a [`NovaCoreApi`] handle from an auxiliary device registered + /// by nova-core. + pub fn of(adev: &auxiliary::Device) -> Result>> { + adev.registration_data::)>() + } +} diff --git a/drivers/gpu/nova-core/driver.rs b/drivers/gpu/nova-core/driver= .rs index 48380ac15f68..435aa917d3e7 100644 --- a/drivers/gpu/nova-core/driver.rs +++ b/drivers/gpu/nova-core/driver.rs @@ -18,6 +18,7 @@ types::CovariantForLt, }; =20 +use crate::api::NovaCoreApi; use crate::gpu::Gpu; =20 /// Counter for generating unique auxiliary device IDs. @@ -25,11 +26,14 @@ =20 #[pin_data] pub(crate) struct NovaCore<'bound> { + // Fields are dropped in declaration order: unregister the auxiliary + // device before dropping `gpu`, and drop `gpu` before `bar` because `= Gpu` + // borrows `bar`. + #[allow(clippy::type_complexity)] + _reg: auxiliary::Registration<'bound, CovariantForLt!(NovaCoreApi<'_>)= >, #[pin] pub(crate) gpu: Gpu<'bound>, bar: pci::Bar<'bound, BAR0_SIZE>, - #[allow(clippy::type_complexity)] - _reg: auxiliary::Registration<'bound, CovariantForLt!(())>, } =20 pub(crate) struct NovaCoreDriver; @@ -86,15 +90,33 @@ fn probe<'bound>( // (`try_pin_init!()` initializes fields in declaration or= der), lives at a pinned // stable address, and is dropped after `gpu` (struct fiel= d drop order). gpu <- Gpu::new(pdev, unsafe { &*core::ptr::from_ref(bar) = }), - _reg: auxiliary::Registration::new( - pdev.as_ref(), - c"nova-drm", - // TODO[XARR]: Use XArray or perhaps IDA for proper ID= allocation/recycling. For - // now, use a simple atomic counter that never recycle= s IDs. - AUXILIARY_ID_COUNTER.fetch_add(1, Relaxed), - crate::MODULE_NAME, - (), - )?, + + _reg: { + // TODO: Use `&gpu` self-referential pin-init syntax o= nce available. + // + // SAFETY: `gpu` is initialized before this expression= is evaluated + // (`try_pin_init!()` initializes fields in declaratio= n order), lives at + // a pinned stable address, and is dropped after `_reg= ` (struct field + // drop order). + let gpu =3D unsafe { + Pin::new_unchecked(&*core::ptr::from_ref(gpu.as_re= f().get_ref())) + }; + + // SAFETY: `NovaCore` is dropped when the device is un= bound; + // i.e. `mem::forget()` is never called on it. + unsafe { + auxiliary::Registration::new_with_lt( + pdev.as_ref(), + c"nova-drm", + // TODO[XARR]: Use XArray or perhaps IDA for p= roper ID + // allocation/recycling. For now, use a simple= atomic counter that + // never recycles IDs. + AUXILIARY_ID_COUNTER.fetch_add(1, Relaxed), + crate::MODULE_NAME, + NovaCoreApi { gpu }, + )? + } + }, })) }) } diff --git a/drivers/gpu/nova-core/gsp/hal.rs b/drivers/gpu/nova-core/gsp/h= al.rs index 34b4bb82a999..b59bcaf2042e 100644 --- a/drivers/gpu/nova-core/gsp/hal.rs +++ b/drivers/gpu/nova-core/gsp/hal.rs @@ -29,7 +29,7 @@ /// The GSP unload code might run in a situation where we cannot load firm= ware dynamically (e.g. /// because we are in shutdown and the file system is not accessible anymo= re). Thus, the firmware /// required for unloading is prepared at load time, and stored here until= it needs to be run. -pub(super) trait UnloadBundle: Send { +pub(super) trait UnloadBundle: Send + Sync { /// Performs the steps required to properly reset the GSP after it has= been stopped. fn run(&self, ctx: &mut GspBootContext<'_, '_>) -> Result; } diff --git a/drivers/gpu/nova-core/nova_core.rs b/drivers/gpu/nova-core/nov= a_core.rs index a61406ba5c0b..9463ae038e81 100644 --- a/drivers/gpu/nova-core/nova_core.rs +++ b/drivers/gpu/nova-core/nova_core.rs @@ -10,6 +10,7 @@ InPlaceModule, // }; =20 +pub mod api; mod driver; mod falcon; mod fb; --=20 2.54.0 From nobody Fri Jul 24 05:21:28 2026 Received: from BYAPR05CU005.outbound.protection.outlook.com (mail-westusazon11010000.outbound.protection.outlook.com [52.101.85.0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B550E3191D6; Thu, 23 Jul 2026 06:31:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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charset="utf-8" Currently the nova-drm stub driver doesn't really interact with a real device, so it doesn't have any registration data and has no way to call into nova-core. To allow for this add a DrmRegData type which will hold a reference to the NovaCoreApi associated with the auxbus device. Signed-off-by: Alistair Popple Suggested-by: Danilo Krummrich --- Changes from v2: - Add newline in crate import Changes from v1: - Drop unrelated device::Bound removal. - Switch exisiting import to vertical style. - s/allow(dead_code)/expect(unused)/ --- drivers/gpu/drm/nova/driver.rs | 17 +++++++++++++++-- drivers/gpu/drm/nova/file.rs | 12 ++++++++---- 2 files changed, 23 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/nova/driver.rs b/drivers/gpu/drm/nova/driver.rs index 739690bc2db5..632137d1c6d7 100644 --- a/drivers/gpu/drm/nova/driver.rs +++ b/drivers/gpu/drm/nova/driver.rs @@ -1,5 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 =20 +use core::pin::Pin; + use kernel::{ auxiliary, device::{ @@ -18,6 +20,8 @@ use crate::file::File; use crate::gem::NovaObject; =20 +use nova_core::api::NovaCoreApi; + pub(crate) struct NovaDriver; =20 pub(crate) struct Nova<'bound> { @@ -26,6 +30,12 @@ pub(crate) struct Nova<'bound> { _reg: drm::Registration<'bound, NovaDriver>, } =20 +/// DRM registration data, accessible from ioctl handlers via the registra= tion guard. +pub(crate) struct DrmRegData<'bound> { + #[expect(unused)] + pub(crate) api: Pin<&'bound NovaCoreApi<'bound>>, +} + /// Convienence type alias for the DRM device type for this driver pub(crate) type NovaDevice =3D drm::Device; =20 @@ -60,9 +70,12 @@ fn probe<'bound>( _info: &'bound Self::IdInfo, ) -> impl PinInit, Error> + 'bound { let drm =3D drm::UnregisteredDevice::::new(adev, Ok(()))?; + let reg_data =3D DrmRegData { + api: NovaCoreApi::of(adev)?, + }; // SAFETY: `reg` is stored in `Nova` and dropped when the driver i= s unbound; it is // never forgotten. - let reg =3D unsafe { drm::Registration::new(adev.as_ref(), drm, ()= , 0)? }; + let reg =3D unsafe { drm::Registration::new(adev.as_ref(), drm, re= g_data, 0)? }; =20 Ok(Nova { drm: reg.device().into(), @@ -74,7 +87,7 @@ fn probe<'bound>( #[vtable] impl drm::Driver for NovaDriver { type Data =3D (); - type RegistrationData<'a> =3D (); + type RegistrationData<'a> =3D DrmRegData<'a>; type File =3D File; type Object =3D gem::Object; type ParentDevice =3D auxiliary::Device; diff --git a/drivers/gpu/drm/nova/file.rs b/drivers/gpu/drm/nova/file.rs index 298c02bacb4b..1156df51c533 100644 --- a/drivers/gpu/drm/nova/file.rs +++ b/drivers/gpu/drm/nova/file.rs @@ -1,6 +1,10 @@ // SPDX-License-Identifier: GPL-2.0 =20 -use crate::driver::{NovaDevice, NovaDriver}; 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charset="utf-8" The chipid contains the GPU architecture and implementation and needs to be exposed to user-space. This adds a public enum to the userspace headers for each chip ID. Nova-core can then use this enum to define it's chipsets. This does create a coupling between nova-drm and nova-core whereby nova-core depends on the values defined by the user-space API for nova-drm. However this is entirely appropriate as nova-core must be bound by the UAPI headers as the enum values are read by nova-core and passed through to user-space. Note that nova-core currently refers to the chipid as a chipset. This isn't ideal given that chipid is the preferred and more accurate term and is what should be exposed via the uAPI. Therefore a future patch series will be posted that aligns nova-core internals to using chipid rather than chipset. Signed-off-by: Alistair Popple --- Changes since v2: - New for v3, split out from "drm: nova: Add GETPARAM parameter to read the GPU chipset" --- drivers/gpu/nova-core/gpu.rs | 64 +++++++++++++++++++----------------- include/uapi/drm/nova_drm.h | 33 +++++++++++++++++++ 2 files changed, 67 insertions(+), 30 deletions(-) diff --git a/drivers/gpu/nova-core/gpu.rs b/drivers/gpu/nova-core/gpu.rs index 442c0979f9c6..738a590e753b 100644 --- a/drivers/gpu/nova-core/gpu.rs +++ b/drivers/gpu/nova-core/gpu.rs @@ -10,7 +10,8 @@ num::Bounded, pci, prelude::*, - sizes::SizeConstants, // + sizes::SizeConstants, + uapi, // }; =20 use crate::{ @@ -35,12 +36,13 @@ mod hal; =20 macro_rules! define_chipset { - ({ $($variant:ident =3D $value:expr),* $(,)* }) =3D> + ({ $($variant:ident),* $(,)* }) =3D> { + ::kernel::macros::paste!( /// Enum representation of the GPU chipset. #[derive(fmt::Debug, Copy, Clone, PartialOrd, Ord, PartialEq, Eq)] pub(crate) enum Chipset { - $($variant =3D $value),*, + $($variant =3D uapi::[] as isize),*, } =20 impl Chipset { @@ -48,7 +50,6 @@ impl Chipset { $( Chipset::$variant, )* ]; =20 - ::kernel::macros::paste!( /// Returns the name of this chipset, in lowercase. /// /// # Examples @@ -64,7 +65,6 @@ pub(crate) const fn name(&self) -> &'static str { )* } } - ); } =20 // TODO[FPRI]: replace with something like derive(FromPrimitive) @@ -73,45 +73,49 @@ impl TryFrom for Chipset { =20 fn try_from(value: u32) -> Result { match value { - $( $value =3D> Ok(Chipset::$variant), )* + $( + uapi::[] + =3D> Ok(Chipset::$variant), + )* _ =3D> Err(ENODEV), } } } + ); } } =20 define_chipset!({ // Turing - TU102 =3D 0x162, - TU104 =3D 0x164, - TU106 =3D 0x166, - TU117 =3D 0x167, - TU116 =3D 0x168, + TU102, + TU104, + TU106, + TU117, + TU116, // Ampere - GA100 =3D 0x170, - GA102 =3D 0x172, - GA103 =3D 0x173, - GA104 =3D 0x174, - GA106 =3D 0x176, - GA107 =3D 0x177, + GA100, + GA102, + GA103, + GA104, + GA106, + GA107, // Hopper - GH100 =3D 0x180, + GH100, // Ada - AD102 =3D 0x192, - AD103 =3D 0x193, - AD104 =3D 0x194, - AD106 =3D 0x196, - AD107 =3D 0x197, + AD102, + AD103, + AD104, + AD106, + AD107, // Blackwell GB10x - GB100 =3D 0x1a0, - GB102 =3D 0x1a2, + GB100, + GB102, // Blackwell GB20x - GB202 =3D 0x1b2, - GB203 =3D 0x1b3, - GB205 =3D 0x1b5, - GB206 =3D 0x1b6, - GB207 =3D 0x1b7, + GB202, + GB203, + GB205, + GB206, + GB207, }); =20 impl Chipset { diff --git a/include/uapi/drm/nova_drm.h b/include/uapi/drm/nova_drm.h index 3ca90ed9d2bb..cb13fba6b952 100644 --- a/include/uapi/drm/nova_drm.h +++ b/include/uapi/drm/nova_drm.h @@ -25,6 +25,39 @@ extern "C" { */ #define NOVA_GETPARAM_VRAM_BAR_SIZE 0x1 =20 +enum drm_nova_chipid { + /* Turing */ + NOVA_DRM_CHIPID_TU102 =3D 0x162, + NOVA_DRM_CHIPID_TU104 =3D 0x164, + NOVA_DRM_CHIPID_TU106 =3D 0x166, + NOVA_DRM_CHIPID_TU117 =3D 0x167, + NOVA_DRM_CHIPID_TU116 =3D 0x168, + /* Ampere */ + NOVA_DRM_CHIPID_GA100 =3D 0x170, + NOVA_DRM_CHIPID_GA102 =3D 0x172, + NOVA_DRM_CHIPID_GA103 =3D 0x173, + NOVA_DRM_CHIPID_GA104 =3D 0x174, + NOVA_DRM_CHIPID_GA106 =3D 0x176, + NOVA_DRM_CHIPID_GA107 =3D 0x177, + /* Hopper */ + NOVA_DRM_CHIPID_GH100 =3D 0x180, + /* Ada */ + NOVA_DRM_CHIPID_AD102 =3D 0x192, + NOVA_DRM_CHIPID_AD103 =3D 0x193, + NOVA_DRM_CHIPID_AD104 =3D 0x194, + NOVA_DRM_CHIPID_AD106 =3D 0x196, + NOVA_DRM_CHIPID_AD107 =3D 0x197, + /* Blackwell GB10x */ + NOVA_DRM_CHIPID_GB100 =3D 0x1a0, + NOVA_DRM_CHIPID_GB102 =3D 0x1a2, + /* Blackwell GB20x */ + NOVA_DRM_CHIPID_GB202 =3D 0x1b2, + NOVA_DRM_CHIPID_GB203 =3D 0x1b3, + NOVA_DRM_CHIPID_GB205 =3D 0x1b5, + NOVA_DRM_CHIPID_GB206 =3D 0x1b6, + NOVA_DRM_CHIPID_GB207 =3D 0x1b7, +}; 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charset="utf-8" One of the first things a user needs to know about a GPU is its chipid, so add a GETPARAM parameter to return that. Signed-off-by: Alistair Popple --- Changes since v2: - Split out enum definition into its own patch - Change uAPI to use chipid rather than chipset Changes since v1: - Vertical import - Use a single enum for chipset values --- drivers/gpu/drm/nova/driver.rs | 1 - drivers/gpu/drm/nova/file.rs | 3 ++- drivers/gpu/nova-core/api.rs | 11 +++++++++-- drivers/gpu/nova-core/gpu.rs | 10 +++++----- include/uapi/drm/nova_drm.h | 7 +++++++ 5 files changed, 23 insertions(+), 9 deletions(-) diff --git a/drivers/gpu/drm/nova/driver.rs b/drivers/gpu/drm/nova/driver.rs index 632137d1c6d7..f144417b29c9 100644 --- a/drivers/gpu/drm/nova/driver.rs +++ b/drivers/gpu/drm/nova/driver.rs @@ -32,7 +32,6 @@ pub(crate) struct Nova<'bound> { =20 /// DRM registration data, accessible from ioctl handlers via the registra= tion guard. pub(crate) struct DrmRegData<'bound> { - #[expect(unused)] pub(crate) api: Pin<&'bound NovaCoreApi<'bound>>, } =20 diff --git a/drivers/gpu/drm/nova/file.rs b/drivers/gpu/drm/nova/file.rs index 1156df51c533..855f23877734 100644 --- a/drivers/gpu/drm/nova/file.rs +++ b/drivers/gpu/drm/nova/file.rs @@ -34,7 +34,7 @@ impl File { /// IOCTL: get_param: Query GPU / driver metadata. pub(crate) fn get_param( dev: &NovaDevice, - _reg_data: &DrmRegData<'_>, + reg_data: &DrmRegData<'_>, getparam: &mut uapi::drm_nova_getparam, _file: &drm::File, ) -> Result { @@ -43,6 +43,7 @@ pub(crate) fn get_param( =20 let value =3D match getparam.param as u32 { uapi::NOVA_GETPARAM_VRAM_BAR_SIZE =3D> pdev.resource_len(1)?, + uapi::NOVA_GETPARAM_GPU_CHIPID =3D> reg_data.api.chipset() as = u64, _ =3D> return Err(EINVAL), }; =20 diff --git a/drivers/gpu/nova-core/api.rs b/drivers/gpu/nova-core/api.rs index 610cfc01111e..09da0b4e9103 100644 --- a/drivers/gpu/nova-core/api.rs +++ b/drivers/gpu/nova-core/api.rs @@ -12,11 +12,13 @@ types::CovariantForLt, // }; =20 -use crate::gpu::Gpu; +use crate::gpu::{ + Chipset, + Gpu, // +}; =20 /// API handle for the auxiliary bus child drivers to interact with nova-c= ore. pub struct NovaCoreApi<'bound> { - #[expect(unused)] pub(crate) gpu: Pin<&'bound Gpu<'bound>>, } =20 @@ -26,4 +28,9 @@ impl NovaCoreApi<'_> { pub fn of(adev: &auxiliary::Device) -> Result>> { adev.registration_data::)>() } + + /// Returns the chipset of this GPU. + pub fn chipset(&self) -> Chipset { + self.gpu.spec.chipset + } } diff --git a/drivers/gpu/nova-core/gpu.rs b/drivers/gpu/nova-core/gpu.rs index 738a590e753b..264fe4e65b3f 100644 --- a/drivers/gpu/nova-core/gpu.rs +++ b/drivers/gpu/nova-core/gpu.rs @@ -41,7 +41,7 @@ macro_rules! define_chipset { ::kernel::macros::paste!( /// Enum representation of the GPU chipset. #[derive(fmt::Debug, Copy, Clone, PartialOrd, Ord, PartialEq, Eq)] - pub(crate) enum Chipset { + pub enum Chipset { $($variant =3D uapi::[] as isize),*, } =20 @@ -119,7 +119,7 @@ fn try_from(value: u32) -> Result { }); =20 impl Chipset { - pub(crate) const fn arch(self) -> Architecture { + pub const fn arch(self) -> Architecture { match self { Self::TU102 | Self::TU104 | Self::TU106 | Self::TU117 | Self::= TU116 =3D> { Architecture::Turing @@ -161,7 +161,7 @@ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Resul= t { bounded_enum! { /// Enum representation of the GPU generation. #[derive(fmt::Debug, Copy, Clone)] - pub(crate) enum Architecture with TryFrom> { + pub enum Architecture with TryFrom> { Turing =3D 0x16, Ampere =3D 0x17, Hopper =3D 0x18, @@ -195,7 +195,7 @@ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Resul= t { /// Structure holding a basic description of the GPU: `Chipset` and `Revis= ion`. #[derive(Clone, Copy)] pub(crate) struct Spec { - chipset: Chipset, + pub(crate) chipset: Chipset, revision: Revision, } =20 @@ -281,7 +281,7 @@ struct GspResources<'gpu> { /// Structure holding the resources required to operate the GPU. #[pin_data] pub(crate) struct Gpu<'gpu> { - spec: Spec, + pub(crate) spec: Spec, /// Static GPU information as provided by the GSP. gsp_static_info: GetGspStaticInfoReply, /// GSP and its resources. diff --git a/include/uapi/drm/nova_drm.h b/include/uapi/drm/nova_drm.h index cb13fba6b952..c655302a40fd 100644 --- a/include/uapi/drm/nova_drm.h +++ b/include/uapi/drm/nova_drm.h @@ -25,6 +25,13 @@ extern "C" { */ #define NOVA_GETPARAM_VRAM_BAR_SIZE 0x1 =20 +/* + * NOVA_GETPARAM_GPU_CHIPID + * + * Query the GPU chipid (architecture/implementation). + */ +#define NOVA_GETPARAM_GPU_CHIPID 0x2 + enum drm_nova_chipid { /* Turing */ NOVA_DRM_CHIPID_TU102 =3D 0x162, --=20 2.54.0 From nobody Fri Jul 24 05:21:28 2026 Received: from BYAPR05CU005.outbound.protection.outlook.com (mail-westusazon11010005.outbound.protection.outlook.com [52.101.85.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0EAEF3C9EE5; 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charset="utf-8" Add a parameter to the existing GETPARAM ioctl to return the total usable framebuffer size. The usable framebuffer excludes GSP carveouts and other protected regions so may differ in size from BAR size and total physical VRAM. Signed-off-by: Alistair Popple --- Changes since v2: - Commit wording Changes since v1: - Fix rustfmt --- drivers/gpu/drm/nova/file.rs | 1 + drivers/gpu/nova-core/api.rs | 5 +++++ drivers/gpu/nova-core/gpu.rs | 6 ++---- drivers/gpu/nova-core/gsp/commands.rs | 8 ++++++++ include/uapi/drm/nova_drm.h | 7 +++++++ 5 files changed, 23 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/nova/file.rs b/drivers/gpu/drm/nova/file.rs index 855f23877734..8c02be4f15bf 100644 --- a/drivers/gpu/drm/nova/file.rs +++ b/drivers/gpu/drm/nova/file.rs @@ -44,6 +44,7 @@ pub(crate) fn get_param( let value =3D match getparam.param as u32 { uapi::NOVA_GETPARAM_VRAM_BAR_SIZE =3D> pdev.resource_len(1)?, uapi::NOVA_GETPARAM_GPU_CHIPID =3D> reg_data.api.chipset() as = u64, + uapi::NOVA_GETPARAM_VRAM_SIZE =3D> reg_data.api.vram_size(), _ =3D> return Err(EINVAL), }; =20 diff --git a/drivers/gpu/nova-core/api.rs b/drivers/gpu/nova-core/api.rs index 09da0b4e9103..f025df90dc5d 100644 --- a/drivers/gpu/nova-core/api.rs +++ b/drivers/gpu/nova-core/api.rs @@ -33,4 +33,9 @@ pub fn of(adev: &auxiliary::Device) -> Result>> { pub fn chipset(&self) -> Chipset { self.gpu.spec.chipset } + + /// Returns the total usable VRAM size of this GPU in bytes. + pub fn vram_size(&self) -> u64 { + self.gpu.gsp_static_info.vram_size() + } } diff --git a/drivers/gpu/nova-core/gpu.rs b/drivers/gpu/nova-core/gpu.rs index 264fe4e65b3f..6581c91a0b78 100644 --- a/drivers/gpu/nova-core/gpu.rs +++ b/drivers/gpu/nova-core/gpu.rs @@ -283,7 +283,7 @@ struct GspResources<'gpu> { pub(crate) struct Gpu<'gpu> { pub(crate) spec: Spec, /// Static GPU information as provided by the GSP. - gsp_static_info: GetGspStaticInfoReply, + pub(crate) gsp_static_info: GetGspStaticInfoReply, /// GSP and its resources. #[pin] gsp_resources: GspResources<'gpu>, @@ -400,9 +400,7 @@ pub(crate) fn new( dev_dbg!( dev, "Total usable VRAM: {} MiB\n", - info.usable_fb_regions.iter().fold(0u64, |res, reg= ion| res - .saturating_add(region.end - region.start)) - / u64::SZ_1M + info.vram_size() / u64::SZ_1M ); 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charset="utf-8" Currently nova-drm reads the VRAM BAR size directly from the PCIe device which requires trying to cast the parent device into a PCIe device. This obviously requires the parent device to actually be a PCIe bus device. Whilst that is true today it may not always be the case, and there is no reason to make this assumption now that NovaCoreApi can hold a reference to the bound PCIe device. So convert nova-drm to using nova-core to obtain the VRAM_BAR_SIZE parameter. Signed-off-by: Alistair Popple --- Changes from v2: - Update nova-core API to use bar1_size() instead of vram_bar_size() as this is used internally throughout our chip HW. --- drivers/gpu/drm/nova/file.rs | 10 ++-------- drivers/gpu/nova-core/api.rs | 8 ++++++++ drivers/gpu/nova-core/driver.rs | 2 +- 3 files changed, 11 insertions(+), 9 deletions(-) diff --git a/drivers/gpu/drm/nova/file.rs b/drivers/gpu/drm/nova/file.rs index 8c02be4f15bf..d65630079237 100644 --- a/drivers/gpu/drm/nova/file.rs +++ b/drivers/gpu/drm/nova/file.rs @@ -8,14 +8,11 @@ use crate::gem::NovaObject; use kernel::{ alloc::flags::*, - auxiliary, - device::Bound, drm::{ self, gem::BaseObject, Registered, // }, - pci, prelude::*, uapi, }; @@ -33,16 +30,13 @@ fn open(_dev: &NovaDevice) -> Result>> { impl File { /// IOCTL: get_param: Query GPU / driver metadata. pub(crate) fn get_param( - dev: &NovaDevice, + _dev: &NovaDevice, reg_data: &DrmRegData<'_>, getparam: &mut uapi::drm_nova_getparam, _file: &drm::File, ) -> Result { - let adev: &auxiliary::Device =3D dev.as_ref(); - let pdev: &pci::Device =3D adev.parent().try_into()?; - let value =3D match getparam.param as u32 { - uapi::NOVA_GETPARAM_VRAM_BAR_SIZE =3D> pdev.resource_len(1)?, + uapi::NOVA_GETPARAM_VRAM_BAR_SIZE =3D> reg_data.api.bar1_size(= )?, uapi::NOVA_GETPARAM_GPU_CHIPID =3D> reg_data.api.chipset() as = u64, uapi::NOVA_GETPARAM_VRAM_SIZE =3D> reg_data.api.vram_size(), _ =3D> return Err(EINVAL), diff --git a/drivers/gpu/nova-core/api.rs b/drivers/gpu/nova-core/api.rs index f025df90dc5d..9e2a5ba7c269 100644 --- a/drivers/gpu/nova-core/api.rs +++ b/drivers/gpu/nova-core/api.rs @@ -8,6 +8,7 @@ use kernel::{ auxiliary, device::Bound, + pci, prelude::*, types::CovariantForLt, // }; @@ -20,6 +21,7 @@ /// API handle for the auxiliary bus child drivers to interact with nova-c= ore. pub struct NovaCoreApi<'bound> { pub(crate) gpu: Pin<&'bound Gpu<'bound>>, + pub(crate) pdev: &'bound pci::Device, } =20 impl NovaCoreApi<'_> { @@ -34,6 +36,12 @@ pub fn chipset(&self) -> Chipset { self.gpu.spec.chipset } =20 + /// Returns the size of the PCIe BAR used for accessing VRAM, typically + /// BAR1. + pub fn bar1_size(&self) -> Result { + self.pdev.resource_len(1) + } + /// Returns the total usable VRAM size of this GPU in bytes. pub fn vram_size(&self) -> u64 { self.gpu.gsp_static_info.vram_size() diff --git a/drivers/gpu/nova-core/driver.rs b/drivers/gpu/nova-core/driver= .rs index 435aa917d3e7..175275fd7961 100644 --- a/drivers/gpu/nova-core/driver.rs +++ b/drivers/gpu/nova-core/driver.rs @@ -113,7 +113,7 @@ fn probe<'bound>( // never recycles IDs. 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charset="utf-8" nova-drm currently only exposes a primary node even though all of its ioctls are already marked DRM_RENDER_ALLOW. Set the DRIVER_RENDER feature so that a render node (/dev/dri/renderDXX) is created as well. This is required to allow render and compute clients to interact with nova-drm. Signed-off-by: Alistair Popple --- Changes since v2: - New for v3. --- drivers/gpu/drm/nova/driver.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/nova/driver.rs b/drivers/gpu/drm/nova/driver.rs index f144417b29c9..a9016fcd6518 100644 --- a/drivers/gpu/drm/nova/driver.rs +++ b/drivers/gpu/drm/nova/driver.rs @@ -92,6 +92,7 @@ impl drm::Driver for NovaDriver { type ParentDevice =3D auxiliary::Device; =20 const INFO: drm::DriverInfo =3D INFO; + const FEAT_RENDER: bool =3D true; =20 kernel::declare_drm_ioctls! { (NOVA_GETPARAM, drm_nova_getparam, ioctl::RENDER_ALLOW, File::get_= param), --=20 2.54.0