This is a note to let you know that I've just added the patch titled
drm/amdgpu: amdgpu_ttm_gart_bind set gtt bound flag
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amdgpu-amdgpu_ttm_gart_bind-set-gtt-bound-flag.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7e44d0b923af204165b9111529c028376bd5556b
Author: Philip Yang <Philip.Yang@xxxxxxx>
Date: Mon Mar 11 18:07:34 2024 -0400
drm/amdgpu: amdgpu_ttm_gart_bind set gtt bound flag
[ Upstream commit 6c6064cbe58b43533e3451ad6a8ba9736c109ac3 ]
Otherwise after the GTT bo is released, the GTT and gart space is freed
but amdgpu_ttm_backend_unbind will not clear the gart page table entry
and leave valid mapping entry pointing to the stale system page. Then
if GPU access the gart address mistakely, it will read undefined value
instead page fault, harder to debug and reproduce the real issue.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Philip Yang <Philip.Yang@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index b06fb1fa411b4..9a1b19e3d4378 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -859,6 +859,7 @@ static int amdgpu_ttm_gart_bind(struct amdgpu_device *adev,
r = amdgpu_gart_bind(adev, gtt->offset, ttm->num_pages,
gtt->ttm.dma_address, flags);
}
+ gtt->bound = true;
gart_bind_fail:
if (r)
