Re: [PATCH 2/3] drm/amdgpu: validate bo before restoring from shadow

[zhoucm1 <david1.zhou-5C7GfCeVMHo@public.gmane.org>]

On 2017年04月21日 15:07, Roger.He wrote:
> Change-Id: Id925f4e241c4192127880d2017fbf2979aa09fc7
> Signed-off-by: Roger.He <Hongbo.He@amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 46 ++++++++++++++++++++++++++++++
>   1 file changed, 46 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 3d8f227..f882496 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -2468,6 +2468,40 @@ bool amdgpu_need_backup(struct amdgpu_device *adev)
>   	return amdgpu_lockup_timeout > 0 ? true : false;
>   }
>   
> +static int amdgpu_bo_validate_helper(struct amdgpu_bo *bo)
> +{
> +	uint32_t domain;
> +	int r;
> +
> +	if (bo->pin_count)
> +		return 0;
> +
> +	domain = bo->prefered_domains;
> +
> +retry:
> +	amdgpu_ttm_placement_from_domain(bo, domain);
> +	r = ttm_bo_validate(&bo->tbo, &bo->placement, false, false);
> +	if (unlikely(r == -ENOMEM) && domain != bo->allowed_domains) {
> +		domain = bo->allowed_domains;
> +		goto retry;
> +	}
> +
> +	return r;
> +}
> +
> +static int amdgpu_bo_validate(struct amdgpu_bo *bo)
> +{
> +	int r = amdgpu_bo_validate_helper(bo);
> +
> +	if (r)
> +		return r;
> +
> +	if (bo->shadow)
> +		r = amdgpu_bo_validate_helper(bo->shadow);
> +
> +	return r;
> +}
> +
>   static int amdgpu_recover_vram_from_shadow(struct amdgpu_device *adev,
>   					   struct amdgpu_ring *ring,
>   					   struct amdgpu_bo *bo,
> @@ -2485,6 +2519,18 @@ static int amdgpu_recover_vram_from_shadow(struct amdgpu_device *adev,
>   	domain = amdgpu_mem_type_to_domain(bo->tbo.mem.mem_type);
>   	/* if bo has been evicted, then no need to recover */
>   	if (domain == AMDGPU_GEM_DOMAIN_VRAM) {
> +		r = amdgpu_bo_validate(bo);
you only need to validate shadow, parent already is checked.

Regards,
David Zhou
> +		if (r) {
> +			DRM_ERROR("bo validate failed!\n");
> +			goto err;
> +		}
> +
> +		r = amdgpu_ttm_bind(&bo->shadow->tbo, &bo->shadow->tbo.mem);
> +		if (r) {
> +			DRM_ERROR("%p bind failed\n", bo->shadow);
> +			goto err;
> +		}
> +
>   		r = amdgpu_bo_restore_from_shadow(adev, ring, bo,
>   						 NULL, fence, true);
>   		if (r) {

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