drm/amdgpu: validate shadow before restoring from it

Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Roger.He <Hongbo.He@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

@@ -2429,6 +2429,18 @@ 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->shadow);
+		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) {

drivers/gpu/drm/amd/amdgpu/amdgpu_object.c

@@ -543,6 +543,27 @@ int amdgpu_bo_backup_to_shadow(struct amdgpu_device *adev,
 	return r;
 }
 
+int amdgpu_bo_validate(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;
+}
+
 int amdgpu_bo_restore_from_shadow(struct amdgpu_device *adev,
 				  struct amdgpu_ring *ring,
 				  struct amdgpu_bo *bo,

drivers/gpu/drm/amd/amdgpu/amdgpu_object.h

@@ -175,6 +175,7 @@ int amdgpu_bo_backup_to_shadow(struct amdgpu_device *adev,
 			       struct amdgpu_bo *bo,
 			       struct reservation_object *resv,
 			       struct dma_fence **fence, bool direct);
+int amdgpu_bo_validate(struct amdgpu_bo *bo);
 int amdgpu_bo_restore_from_shadow(struct amdgpu_device *adev,
 				  struct amdgpu_ring *ring,
 				  struct amdgpu_bo *bo,