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Conversely, it is also common to split a u64 into two u32s to write them into registers. Add an extension trait for u64 that implement these methods in a new `num` module. It is expected that this trait will be extended with other useful operations, and similar extension traits implemented for other types. Signed-off-by: Alexandre Courbot Reviewed-by: Sergio Gonz=C3=A1lez Collado --- rust/kernel/lib.rs | 1 + rust/kernel/num.rs | 32 ++++++++++++++++++++++++++++++++ 2 files changed, 33 insertions(+) diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs index 496ed32b0911a9fdbce5d26738b9cf7ef910b269..8c0c7c20a16aa96e3d3e444be3e= 03878650ddf77 100644 --- a/rust/kernel/lib.rs +++ b/rust/kernel/lib.rs @@ -59,6 +59,7 @@ pub mod miscdevice; #[cfg(CONFIG_NET)] pub mod net; +pub mod num; pub mod of; pub mod page; #[cfg(CONFIG_PCI)] diff --git a/rust/kernel/num.rs b/rust/kernel/num.rs new file mode 100644 index 0000000000000000000000000000000000000000..5e714cbda4575b8d74f50660580= dc4c5683f8c2b --- /dev/null +++ b/rust/kernel/num.rs @@ -0,0 +1,32 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! Numerical and binary utilities for primitive types. + +/// Useful operations for `u64`. +pub trait U64Ext { + /// Build a `u64` by combining its `high` and `low` parts. + /// + /// ``` + /// use kernel::num::U64Ext; + /// assert_eq!(u64::from_u32s(0x01234567, 0x89abcdef), 0x01234567_89ab= cdef); + /// ``` + fn from_u32s(high: u32, low: u32) -> Self; + + /// Returns the `(high, low)` u32s that constitute `self`. + /// + /// ``` + /// use kernel::num::U64Ext; + /// assert_eq!(u64::into_u32s(0x01234567_89abcdef), (0x1234567, 0x89ab= cdef)); + /// ``` + fn into_u32s(self) -> (u32, u32); +} + +impl U64Ext for u64 { + fn from_u32s(high: u32, low: u32) -> Self { + ((high as u64) << u32::BITS) | low as u64 + } + + fn into_u32s(self) -> (u32, u32) { + ((self >> u32::BITS) as u32, self as u32) + } +} --=20 2.48.1 From nobody Sun Feb 8 07:39:47 2026 Received: from NAM11-BN8-obe.outbound.protection.outlook.com (mail-bn8nam11on2077.outbound.protection.outlook.com [40.107.236.77]) (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 B0B2022489A; 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This first draft is probably very questionable. One point in particular which should IMHO receive attention: the generic wait_on() method aims at providing similar functionality to Nouveau's nvkm_[num]sec() macros. Since this method will be heavily used with different conditions to test, I'd like to avoid monomorphizing it entirely with each instance ; that's something that is achieved in nvkm_xsec() using functions that the macros invoke. I have tried achieving the same result in Rust using closures (kept as-is in the current code), but they seem to be monomorphized as well. Calling extra functions could work better, but looks also less elegant to me, so I am really open to suggestions here. Signed-off-by: Alexandre Courbot --- drivers/gpu/nova-core/driver.rs | 4 +- drivers/gpu/nova-core/gpu.rs | 35 ++++++++++++++- drivers/gpu/nova-core/nova_core.rs | 1 + drivers/gpu/nova-core/regs.rs | 43 ++++++++++++++++++ drivers/gpu/nova-core/timer.rs | 91 ++++++++++++++++++++++++++++++++++= ++++ 5 files changed, 172 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/nova-core/driver.rs b/drivers/gpu/nova-core/driver= .rs index 63c19f140fbdd65d8fccf81669ac590807cc120f..0cd23aa306e4082405f480afc05= 30a41131485e7 100644 --- a/drivers/gpu/nova-core/driver.rs +++ b/drivers/gpu/nova-core/driver.rs @@ -10,7 +10,7 @@ pub(crate) struct NovaCore { pub(crate) gpu: Gpu, } =20 -const BAR0_SIZE: usize =3D 8; +const BAR0_SIZE: usize =3D 0x9500; pub(crate) type Bar0 =3D pci::Bar; =20 kernel::pci_device_table!( @@ -42,6 +42,8 @@ fn probe(pdev: &mut pci::Device, _info: &Self::IdInfo) ->= Result> GFP_KERNEL, )?; =20 + let _ =3D this.gpu.test_timer(); + Ok(this) } } diff --git a/drivers/gpu/nova-core/gpu.rs b/drivers/gpu/nova-core/gpu.rs index e7da6a2fa29d82e9624ba8baa2c7281f38cb3133..2fbf4041f6d421583636c7bede4= 49c3416272301 100644 --- a/drivers/gpu/nova-core/gpu.rs +++ b/drivers/gpu/nova-core/gpu.rs @@ -1,12 +1,16 @@ // SPDX-License-Identifier: GPL-2.0 =20 +use kernel::device::Device; +use kernel::types::ARef; use kernel::{ device, devres::Devres, error::code::*, firmware, fmt, pci, prelude::*= , str::CString, }; =20 use crate::driver::Bar0; use crate::regs; +use crate::timer::Timer; use core::fmt; +use core::time::Duration; =20 /// Enum representation of the GPU chipset. #[derive(fmt::Debug)] @@ -165,10 +169,12 @@ fn new(dev: &device::Device, spec: &Spec, ver: &str) = -> Result { /// Structure holding the resources required to operate the GPU. #[pin_data] pub(crate) struct Gpu { + dev: ARef, spec: Spec, /// MMIO mapping of PCI BAR 0 bar: Devres, fw: Firmware, + timer: Timer, } =20 impl Gpu { @@ -184,6 +190,33 @@ pub(crate) fn new(pdev: &pci::Device, bar: Devres) -> Result Result<()> { + let bar =3D self.bar.try_access().ok_or(ENXIO)?; + + dev_info!(&self.dev, "testing timer subdev\n"); + assert!(matches!( + self.timer + .wait_on(&bar, Duration::from_millis(10), || Some(())), + Ok(()) + )); + assert_eq!( + self.timer + .wait_on(&bar, Duration::from_millis(10), || Option::<()>:= :None), + Err(ETIMEDOUT) + ); + + Ok(()) } } diff --git a/drivers/gpu/nova-core/nova_core.rs b/drivers/gpu/nova-core/nov= a_core.rs index 5d0230042793dae97026146e94f3cdb31ba20642..94b165a340ddfffd448f87cd822= 00391de075806 100644 --- a/drivers/gpu/nova-core/nova_core.rs +++ b/drivers/gpu/nova-core/nova_core.rs @@ -5,6 +5,7 @@ mod driver; mod gpu; mod regs; +mod timer; =20 kernel::module_pci_driver! { type: driver::NovaCore, diff --git a/drivers/gpu/nova-core/regs.rs b/drivers/gpu/nova-core/regs.rs index f2766f95e9d1eeab6734b18525fe504e1e7ea587..5127cc3454c047d64b7aaf599d8= bf5f63a08bdfe 100644 --- a/drivers/gpu/nova-core/regs.rs +++ b/drivers/gpu/nova-core/regs.rs @@ -54,3 +54,46 @@ pub(crate) fn major_rev(&self) -> u8 { ((self.0 & BOOT0_MAJOR_REV_MASK) >> BOOT0_MAJOR_REV_SHIFT) as u8 } } + +const PTIMER_TIME_0: usize =3D 0x00009400; +const PTIMER_TIME_1: usize =3D 0x00009410; + +#[derive(Copy, Clone, PartialEq, Eq)] +pub(crate) struct PtimerTime0(u32); + +impl PtimerTime0 { + #[inline] + pub(crate) fn read(bar: &Bar0) -> Self { + Self(bar.readl(PTIMER_TIME_0)) + } + + #[inline] + pub(crate) fn write(bar: &Bar0, val: u32) { + bar.writel(val, PTIMER_TIME_0) + } + + #[inline] + pub(crate) fn lo(&self) -> u32 { + self.0 + } +} + +#[derive(Copy, Clone, PartialEq, Eq)] +pub(crate) struct PtimerTime1(u32); + +impl PtimerTime1 { + #[inline] + pub(crate) fn read(bar: &Bar0) -> Self { + Self(bar.readl(PTIMER_TIME_1)) + } + + #[inline] + pub(crate) fn write(bar: &Bar0, val: u32) { + bar.writel(val, PTIMER_TIME_1) + } + + #[inline] + pub(crate) fn hi(&self) -> u32 { + self.0 + } +} diff --git a/drivers/gpu/nova-core/timer.rs b/drivers/gpu/nova-core/timer.rs new file mode 100644 index 0000000000000000000000000000000000000000..f6a787d4fbdb90b3dc13e322d50= da1c7f64818df --- /dev/null +++ b/drivers/gpu/nova-core/timer.rs @@ -0,0 +1,91 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! Nova Core Timer subdevice + +use core::time::Duration; + +use kernel::num::U64Ext; +use kernel::prelude::*; + +use crate::driver::Bar0; +use crate::regs; + +pub(crate) struct Timer {} + +impl Timer { + pub(crate) fn new() -> Self { + Self {} + } + + pub(crate) fn read(bar: &Bar0) -> u64 { + loop { + let hi =3D regs::PtimerTime1::read(bar); + let lo =3D regs::PtimerTime0::read(bar); + + if hi =3D=3D regs::PtimerTime1::read(bar) { + return u64::from_u32s(hi.hi(), lo.lo()); + } + } + } + + #[allow(dead_code)] + pub(crate) fn time(bar: &Bar0, time: u64) { + let (hi, lo) =3D time.into_u32s(); + + regs::PtimerTime1::write(bar, hi); + regs::PtimerTime0::write(bar, lo); + } + + /// Wait until `cond` is true or `timeout` elapsed, based on GPU time. + /// + /// When `cond` evaluates to `Some`, its return value is returned. + /// + /// `Err(ETIMEDOUT)` is returned if `timeout` has been reached without= `cond` evaluating to + /// `Some`, or if the timer device is stuck for some reason. + pub(crate) fn wait_on Option>( + &self, + bar: &Bar0, + timeout: Duration, + cond: F, + ) -> Result { + // Number of consecutive time reads after which we consider the ti= mer frozen if it hasn't + // moved forward. + const MAX_STALLED_READS: usize =3D 16; + + let (mut cur_time, mut prev_time, deadline) =3D (|| { + let cur_time =3D Timer::read(bar); + let deadline =3D + cur_time.saturating_add(u64::try_from(timeout.as_nanos()).= unwrap_or(u64::MAX)); + + (cur_time, cur_time, deadline) + })(); + let mut num_reads =3D 0; + + loop { + if let Some(ret) =3D cond() { + return Ok(ret); + } + + (|| { + cur_time =3D Timer::read(bar); + + /* Check if the timer is frozen for some reason. */ + if cur_time =3D=3D prev_time { + if num_reads >=3D MAX_STALLED_READS { + return Err(ETIMEDOUT); + } + num_reads +=3D 1; + } else { + if cur_time >=3D deadline { + return Err(ETIMEDOUT); + } + + num_reads =3D 0; + prev_time =3D cur_time; + } + + Ok(()) + })()?; + } + } +} --=20 2.48.1