[PATCH 2/2] drm/amdgpu: add bo flag that indicates KFD BOs

[Felix Kuehling]

Thanks for following up on that. I'd use a more generic name, maybe
AMDGPU_GEM_CREATE_NO_FALLBACK. And I think you should exclude this flag
in amdgpu_gem_create_ioctl so that allocations through the GEM API can't
use this option.

Regards,
  Felix


On 2018-04-02 03:00 AM, Chunming Zhou wrote:
> KFD wraps amdgpu_bo_create, they have no fallback case which is different
> with amdgpu_gem_object_create.
> since upstream branch has no amdgpu_amdkfd_gpuvm.c, which need KFD
> guys add this flag to __alloc_memory_of_gpu:
> +       flags |= AMDGPU_GEM_CREATE_KFD;
>
> Change-Id: Id3ac1a0bdd48633328d0b22c4c057fab4e94d0b3
> Signed-off-by: Chunming Zhou <david1.zhou at amd.com>
> Cc: felix.kuehling at amd.com
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 3 ++-
>  include/uapi/drm/amdgpu_drm.h              | 2 ++
>  2 files changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> index f04bfab1eebd..72dabb9886be 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> @@ -420,7 +420,8 @@ static int amdgpu_bo_do_create(struct amdgpu_device *adev, unsigned long size,
>  	r = ttm_bo_init_reserved(&adev->mman.bdev, &bo->tbo, size, type,
>  				 &bo->placement, page_align, &ctx, acc_size,
>  				 NULL, resv, &amdgpu_ttm_bo_destroy);
> -	if (unlikely(r && r != -ERESTARTSYS) && type == ttm_bo_type_device) {
> +	if (unlikely(r && r != -ERESTARTSYS) && type == ttm_bo_type_device &&
> +	    !(flags & AMDGPU_GEM_CREATE_KFD)) {
>  		if (flags & AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED) {
>  			flags &= ~AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED;
>  			goto retry;
> diff --git a/include/uapi/drm/amdgpu_drm.h b/include/uapi/drm/amdgpu_drm.h
> index 0087799962cf..0be994be269f 100644
> --- a/include/uapi/drm/amdgpu_drm.h
> +++ b/include/uapi/drm/amdgpu_drm.h
> @@ -98,6 +98,8 @@ extern "C" {
>  #define AMDGPU_GEM_CREATE_VM_ALWAYS_VALID	(1 << 6)
>  /* Flag that BO sharing will be explicitly synchronized */
>  #define AMDGPU_GEM_CREATE_EXPLICIT_SYNC		(1 << 7)
> +/* Flag that BO is created from KFD side */
> +#define AMDGPU_GEM_CREATE_KFD			(1 << 8)
>  
>  struct drm_amdgpu_gem_create_in  {
>  	/** the requested memory size */