Re: [PATCH] drm/amdgpu: Mask out clear/wipe operation if buffer function is unavailable

["Christian König" <christian.koenig@amd.com>]

On 6/16/25 10:21, Lang Yu wrote:
> It makes no sense to use clear/wipe operation if buffer function is
> unavailable. It's useful in bring up phase when SDMA is not ready
> and/or disabled intentionally by amdgpu_ip_block_mask. This avoids
> manually masking out clear/wipe operation repeatedly.

Clear NAK. SDMA can be temporary unavailable during suspend/resume, but that doesn't mean that we can skip that.

Especially ignoring AMDGPU_GEM_CREATE_VRAM_CLEARED will just crash userspace.

Regards,
Christian.

> 
> Signed-off-by: Lang Yu <lang.yu@amd.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> index 3ac52d9b9d30..467c8a1911bc 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> @@ -689,6 +689,10 @@ int amdgpu_bo_create(struct amdgpu_device *adev,
>  	if (!amdgpu_bo_support_uswc(bo->flags))
>  		bo->flags &= ~AMDGPU_GEM_CREATE_CPU_GTT_USWC;
>  
> +	if (!adev->mman.buffer_funcs_enabled)
> +		bo->flags &= ~(AMDGPU_GEM_CREATE_VRAM_CLEARED |
> +			       AMDGPU_GEM_CREATE_VRAM_WIPE_ON_RELEASE);
> +
>  	bo->tbo.bdev = &adev->mman.bdev;
>  	if (bp->domain & (AMDGPU_GEM_DOMAIN_GWS | AMDGPU_GEM_DOMAIN_OA |
>  			  AMDGPU_GEM_DOMAIN_GDS))