linux-next: manual merge of the driver-core tree with the drm-rust tree

linux-next: manual merge of the driver-core tree with the drm-rust tree

[Stephen Rothwell]

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Hi all,

Today's linux-next merge of the driver-core tree got a conflict in:

  drivers/gpu/nova-core/driver.rs

between commit:

  1101c442410c ("gpu: nova-core: Set correct DMA mask")

from the drm-rust tree and commits:

  0242623384c7 ("rust: driver: let probe() return impl PinInit<Self, Error>")
  e4e679c8608e ("rust: auxiliary: unregister on parent device unbind")

from the driver-core tree.

I fixed it up (I think - see below) and can carry the fix as
necessary. This is now fixed as far as linux-next is concerned, but any
non trivial conflicts should be mentioned to your upstream maintainer
when your tree is submitted for merging.  You may also want to consider
cooperating with the maintainer of the conflicting tree to minimise any
particularly complex conflicts.

-- 
Cheers,
Stephen Rothwell

diff --cc drivers/gpu/nova-core/driver.rs
index d91bbc50cde7,ca0d5f8ad54b..000000000000
--- a/drivers/gpu/nova-core/driver.rs
+++ b/drivers/gpu/nova-core/driver.rs
@@@ -1,20 -1,14 +1,21 @@@
  // SPDX-License-Identifier: GPL-2.0
  
  use kernel::{
 -    auxiliary, c_str,
 +    auxiliary,
 +    c_str,
      device::Core,
+     devres::Devres,
 +    dma::Device,
 +    dma::DmaMask,
      pci,
 -    pci::{Class, ClassMask, Vendor},
 +    pci::{
 +        Class,
 +        ClassMask,
 +        Vendor, //
 +    },
      prelude::*,
      sizes::SZ_16M,
 -    sync::Arc,
 +    sync::Arc, //
  };
  
  use crate::gpu::Gpu;
@@@ -67,31 -53,21 +69,26 @@@ impl pci::Driver for NovaCore 
      type IdInfo = ();
      const ID_TABLE: pci::IdTable<Self::IdInfo> = &PCI_TABLE;
  
-     fn probe(pdev: &pci::Device<Core>, _info: &Self::IdInfo) -> Result<Pin<KBox<Self>>> {
-         dev_dbg!(pdev.as_ref(), "Probe Nova Core GPU driver.\n");
+     fn probe(pdev: &pci::Device<Core>, _info: &Self::IdInfo) -> impl PinInit<Self, Error> {
+         pin_init::pin_init_scope(move || {
+             dev_dbg!(pdev.as_ref(), "Probe Nova Core GPU driver.\n");
  
-         pdev.enable_device_mem()?;
-         pdev.set_master();
+             pdev.enable_device_mem()?;
+             pdev.set_master();
  
-         // SAFETY: No concurrent DMA allocations or mappings can be made because
-         // the device is still being probed and therefore isn't being used by
-         // other threads of execution.
-         unsafe { pdev.dma_set_mask_and_coherent(DmaMask::new::<GPU_DMA_BITS>())? };
++            // SAFETY: No concurrent DMA allocations or mappings can be made because
++            // the device is still being probed and therefore isn't being used by
++            // other threads of execution.
++            unsafe { pdev.dma_set_mask_and_coherent(DmaMask::new::<GPU_DMA_BITS>())? };
 +
-         let devres_bar = Arc::pin_init(
-             pdev.iomap_region_sized::<BAR0_SIZE>(0, c_str!("nova-core/bar0")),
-             GFP_KERNEL,
-         )?;
+             let bar = Arc::pin_init(
+                 pdev.iomap_region_sized::<BAR0_SIZE>(0, c_str!("nova-core/bar0")),
+                 GFP_KERNEL,
+             )?;
  
-         // Used to provided a `&Bar0` to `Gpu::new` without tying it to the lifetime of
-         // `devres_bar`.
-         let bar_clone = Arc::clone(&devres_bar);
-         let bar = bar_clone.access(pdev.as_ref())?;
- 
-         let this = KBox::pin_init(
-             try_pin_init!(Self {
-                 gpu <- Gpu::new(pdev, devres_bar, bar),
-                 _reg: auxiliary::Registration::new(
+             Ok(try_pin_init!(Self {
+                 gpu <- Gpu::new(pdev, bar.clone(), bar.access(pdev.as_ref())?),
+                 _reg <- auxiliary::Registration::new(
                      pdev.as_ref(),
                      c_str!("nova-drm"),
                      0, // TODO[XARR]: Once it lands, use XArray; for now we don't use the ID.

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Re: linux-next: manual merge of the driver-core tree with the drm-rust tree

[Alice Ryhl]

On Mon, Nov 17, 2025 at 04:06:21PM +1100, Stephen Rothwell wrote:
> Hi all,
> 
> Today's linux-next merge of the driver-core tree got a conflict in:
> 
>   drivers/gpu/nova-core/driver.rs
> 
> between commit:
> 
>   1101c442410c ("gpu: nova-core: Set correct DMA mask")
> 
> from the drm-rust tree and commits:
> 
>   0242623384c7 ("rust: driver: let probe() return impl PinInit<Self, Error>")
>   e4e679c8608e ("rust: auxiliary: unregister on parent device unbind")
> 
> from the driver-core tree.
> 
> I fixed it up (I think - see below) and can carry the fix as
> necessary. This is now fixed as far as linux-next is concerned, but any
> non trivial conflicts should be mentioned to your upstream maintainer
> when your tree is submitted for merging.  You may also want to consider
> cooperating with the maintainer of the conflicting tree to minimise any
> particularly complex conflicts.

Thanks! Looks good.

Alice

linux-next: manual merge of the driver-core tree with the drm-rust tree

[Mark Brown]

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Hi all,

Today's linux-next merge of the driver-core tree got a conflict in:

  drivers/gpu/nova-core/gpu.rs

between commit:

  f1aab4b1ab829 ("gpu: nova-core: avoid repeated calls to pci::Device::as_ref")

from the drm-rust tree and commit:

  f7acb19abcd86 ("rust: device: make lifetime on `Core` and `CoreInternal` invariant")

from the driver-core tree.

I fixed it up (see below) and can carry the fix as necessary. This
is now fixed as far as linux-next is concerned, but any non trivial
conflicts should be mentioned to your upstream maintainer when your tree
is submitted for merging.  You may also want to consider cooperating
with the maintainer of the conflicting tree to minimise any particularly
complex conflicts.

diff --cc drivers/gpu/nova-core/gpu.rs
index 42a4cd7971fa1,b603b0bd2692b..0000000000000
--- a/drivers/gpu/nova-core/gpu.rs
+++ b/drivers/gpu/nova-core/gpu.rs
@@@ -277,61 -284,15 +277,61 @@@ struct GspResources<'gpu> 
      unload_bundle: Option<gsp::UnloadBundle>,
  }
  
 +/// Structure holding the resources required to operate the GPU.
 +#[pin_data]
 +pub(crate) struct Gpu<'gpu> {
 +    spec: Spec,
 +    /// Static GPU information as provided by the GSP.
 +    gsp_static_info: GetGspStaticInfoReply,
 +    /// GSP and its resources.
 +    #[pin]
 +    gsp_resources: GspResources<'gpu>,
 +    /// System memory page required for flushing all pending GPU-side memory writes done through
 +    /// PCIE into system memory, via sysmembar (A GPU-initiated HW memory-barrier operation).
 +    ///
 +    /// Must be kept declared *after* `gsp_resources`, as the latter's `PinnedDrop` implementation
 +    /// requires the sysmem flush page to be in place.
 +    sysmem_flush: SysmemFlush<'gpu>,
 +}
 +
 +#[pinned_drop]
 +impl PinnedDrop for GspResources<'_> {
 +    fn drop(self: Pin<&mut Self>) {
 +        let this = self.project();
 +        let device = *this.device;
 +        let bar = *this.bar;
 +        let bundle = this.unload_bundle.take();
 +
 +        let _ = this
 +            .gsp
 +            .as_ref()
 +            .get_ref()
 +            .unload(
 +                GspBootContext {
 +                    pdev: device,
 +                    bar,
 +                    chipset: this.spec.chipset,
 +                    gsp_falcon: &*this.gsp_falcon,
 +                    sec2_falcon: &*this.sec2_falcon,
 +                    fsp: this.fsp.as_mut(),
 +                    vgpu: &*this.vgpu,
 +                },
 +                bundle,
 +            )
 +            .inspect_err(|e| dev_err!(device, "failed to unload GSP: {:?}\n", e));
 +    }
 +}
 +
  impl<'gpu> Gpu<'gpu> {
-     pub(crate) fn new(
-         pdev: &'gpu pci::Device<device::Core<'_>>,
+     pub(crate) fn new<'a>(
+         pdev: &'gpu pci::Device<device::Core<'a>>,
          bar: Bar0<'gpu>,
-     ) -> impl PinInit<Self, Error> + 'gpu {
+     ) -> impl PinInit<Self, Error> + use<'gpu, 'a> {
 +        let dev = pdev.as_ref();
 +
          try_pin_init!(Self {
 -            device: pdev.as_ref(),
 -            spec: Spec::new(pdev.as_ref(), bar).inspect(|spec| {
 -                dev_info!(pdev,"NVIDIA ({})\n", spec);
 +            spec: Spec::new(dev, bar).inspect(|spec| {
 +                dev_info!(dev,"NVIDIA ({})\n", spec);
              })?,
  
              // We must wait for GFW_BOOT completion before doing any significant setup on the GPU.

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Re: linux-next: manual merge of the driver-core tree with the drm-rust tree

[Danilo Krummrich]

On Sun Jul 26, 2026 at 11:57 PM CEST, Mark Brown wrote:
> Hi all,
>
> Today's linux-next merge of the driver-core tree got a conflict in:
>
>   drivers/gpu/nova-core/gpu.rs
>
> between commit:
>
>   f1aab4b1ab829 ("gpu: nova-core: avoid repeated calls to pci::Device::as_ref")
>
> from the drm-rust tree and commit:
>
>   f7acb19abcd86 ("rust: device: make lifetime on `Core` and `CoreInternal` invariant")
>
> from the driver-core tree.
>
> I fixed it up (see below) and can carry the fix as necessary.

LGTM, thanks!