Re: [PATCH 11/11] drm/amdgpu: enable GTT PD/PT for raven

["Zhang, Jerry (Junwei)" <Jerry.Zhang-5C7GfCeVMHo@public.gmane.org>]

On 08/22/2018 11:05 PM, Christian König wrote:
> Should work on Vega10 as well, but with an obvious performance hit.
>
> Older APUs can be enabled as well, but will probably be more work.
>
> Signed-off-by: Christian König <christian.koenig@amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 11 ++++++++++-
>   1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index 928fdae0dab4..670a42729f88 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -308,6 +308,7 @@ int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
>   			list_move(&bo_base->vm_status, &vm->moved);
>   			spin_unlock(&vm->moved_lock);
>   		} else {
> +			amdgpu_ttm_alloc_gart(&bo->tbo);
>   			list_move(&bo_base->vm_status, &vm->relocated);
>   		}
>   	}
> @@ -396,6 +397,10 @@ static int amdgpu_vm_clear_bo(struct amdgpu_device *adev,
>   	if (r)
>   		goto error;
>
> +	r = amdgpu_ttm_alloc_gart(&bo->tbo);
> +	if (r)
> +		return r;
> +
>   	r = amdgpu_job_alloc_with_ib(adev, 64, &job);
>   	if (r)
>   		goto error;
> @@ -461,7 +466,11 @@ static void amdgpu_vm_bo_param(struct amdgpu_device *adev, struct amdgpu_vm *vm,
>   	bp->size = amdgpu_vm_bo_size(adev, level);
>   	bp->byte_align = AMDGPU_GPU_PAGE_SIZE;
>   	bp->domain = AMDGPU_GEM_DOMAIN_VRAM;
> -	bp->flags = AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS;
> +	if (bp->size <= PAGE_SIZE && adev->asic_type == CHIP_RAVEN)

Do we need bp->size <= PAGE_SIZE?
Seems it's always less 12 bit for raven?

Regards,
Jerry

> +		bp->domain |= AMDGPU_GEM_DOMAIN_GTT;
> +	bp->domain = amdgpu_bo_get_preferred_pin_domain(adev, bp->domain);
> +	bp->flags = AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS |
> +		AMDGPU_GEM_CREATE_CPU_GTT_USWC;
>   	if (vm->use_cpu_for_update)
>   		bp->flags |= AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED;
>   	else
>
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