linux-hardening - Re: [PATCH v1 5/6] drm/amdgpu: store ib info for devcoredump

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Message-ID: <CADnq5_P02Fx6-VG8Nei4QZozZ9hK1vY=1sYm4DOh71nXtmVehA@mail.gmail.com>
Date: Tue, 17 Feb 2026 11:21:44 -0500
From: Alex Deucher <alexdeucher@...il.com>
To: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>
Cc: Alex Deucher <alexander.deucher@....com>, 
	Christian König <christian.koenig@....com>, 
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, Kees Cook <kees@...nel.org>, 
	"Gustavo A. R. Silva" <gustavoars@...nel.org>, amd-gfx@...ts.freedesktop.org, 
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH v1 5/6] drm/amdgpu: store ib info for devcoredump

On Wed, Feb 11, 2026 at 5:29 AM Pierre-Eric Pelloux-Prayer
<pierre-eric.pelloux-prayer@....com> wrote:
>
> Store the basic state of IBs so we can read it back in the
> amdgpu_devcoredump_format function.
>
> Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>

Reviewed-by: Alex Deucher <alexander.deucher@....com>


> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c | 13 ++++++++++---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.h |  9 +++++++++
>  2 files changed, 19 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c
> index 0bf85ab43204..d0af8a294abf 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c
> @@ -387,6 +387,7 @@ void amdgpu_coredump(struct amdgpu_device *adev, bool skip_vram_check,
>  {
>         struct drm_device *dev = adev_to_drm(adev);
>         struct amdgpu_coredump_info *coredump;
> +       size_t size = sizeof(*coredump);
>         struct drm_sched_job *s_job;
>         u64 total_ring_size, ring_count;
>         struct amdgpu_ring *ring;
> @@ -395,10 +396,10 @@ void amdgpu_coredump(struct amdgpu_device *adev, bool skip_vram_check,
>         if (adev->coredump_in_progress)
>                 return;
>
> -       if (adev->coredump_in_progress)
> -               return;
> +       if (job && job->pasid)
> +               size += sizeof(struct amdgpu_coredump_ib_info) * job->num_ibs;
>
> -       coredump = kzalloc(sizeof(*coredump), GFP_NOWAIT);
> +       coredump = kzalloc(size, GFP_NOWAIT);
>         if (!coredump)
>                 return;
>
> @@ -406,6 +407,7 @@ void amdgpu_coredump(struct amdgpu_device *adev, bool skip_vram_check,
>
>         coredump->skip_vram_check = skip_vram_check;
>         coredump->reset_vram_lost = vram_lost;
> +       coredump->pasid = job->pasid;
>
>         if (job && job->pasid) {
>                 struct amdgpu_task_info *ti;
> @@ -415,6 +417,11 @@ void amdgpu_coredump(struct amdgpu_device *adev, bool skip_vram_check,
>                         coredump->reset_task_info = *ti;
>                         amdgpu_vm_put_task_info(ti);
>                 }
> +               coredump->num_ibs = job->num_ibs;
> +               for (i = 0; i < job->num_ibs; ++i) {
> +                       coredump->ibs[i].gpu_addr = job->ibs[i].gpu_addr;
> +                       coredump->ibs[i].ib_size_dw = job->ibs[i].length_dw;
> +               }
>         }
>
>         if (job) {
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.h
> index 1c3d22356cc7..49486d1f6a5d 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.h
> @@ -38,6 +38,11 @@ struct amdgpu_coredump_ring {
>         u32                             offset;
>  };
>
> +struct amdgpu_coredump_ib_info {
> +       uint64_t                        gpu_addr;
> +       u32                             ib_size_dw;
> +};
> +
>  struct amdgpu_coredump_info {
>         struct amdgpu_device            *adev;
>         struct amdgpu_task_info         reset_task_info;
> @@ -58,6 +63,10 @@ struct amdgpu_coredump_info {
>          */
>         ssize_t                         formatted_size;
>         char                            *formatted;
> +
> +       unsigned int                    pasid;
> +       int                             num_ibs;
> +       struct amdgpu_coredump_ib_info  ibs[] __counted_by(num_ibs);
>  };
>  #endif
>
> --
> 2.43.0
>