[PATCH] drm/amdgpu: Let KFD sync with VM fences

[Christian König]

Am 18.12.23 um 22:21 schrieb Felix Kuehling:
> Change the rules for amdgpu_sync_resv to let KFD synchronize with VM
> fences on page table reservations. This fixes intermittent memory
> corruption after evictions when using amdgpu_vm_handle_moved to update
> page tables for VM mappings managed through render nodes.
>
> Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com>

Reviewed-by: Christian König <christian.koenig at amd.com>

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
> index dcd8c066bc1f..1b013a44ca99 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
> @@ -191,7 +191,8 @@ static bool amdgpu_sync_test_fence(struct amdgpu_device *adev,
>   
>   	/* Never sync to VM updates either. */
>   	if (fence_owner == AMDGPU_FENCE_OWNER_VM &&
> -	    owner != AMDGPU_FENCE_OWNER_UNDEFINED)
> +	    owner != AMDGPU_FENCE_OWNER_UNDEFINED &&
> +	    owner != AMDGPU_FENCE_OWNER_KFD)
>   		return false;
>   
>   	/* Ignore fences depending on the sync mode */