drm/amdgpu: Make contiguous pinning optional

Enable pinning of VRAM without forcing it to be contiguous. When memory is
already pinned, make sure it's contiguous if requested.
Suggested-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -911,10 +911,15 @@ int amdgpu_bo_pin_restricted(struct amdgpu_bo *bo, u32 domain,
 
 	if (bo->tbo.pin_count) {
 		uint32_t mem_type = bo->tbo.mem.mem_type;
+		uint32_t mem_flags = bo->tbo.mem.placement;
 
 		if (!(domain & amdgpu_mem_type_to_domain(mem_type)))
 			return -EINVAL;
 
+		if ((bo->flags & AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS) &&
+		    !(mem_flags & TTM_PL_FLAG_CONTIGUOUS))
+			return -EINVAL;
+
 		ttm_bo_pin(&bo->tbo);
 
 		if (max_offset != 0) {
@@ -930,7 +935,6 @@ int amdgpu_bo_pin_restricted(struct amdgpu_bo *bo, u32 domain,
 	if (bo->tbo.base.import_attach)
 		dma_buf_pin(bo->tbo.base.import_attach);
 
-	bo->flags |= AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS;
 	/* force to pin into visible video ram */
 	if (!(bo->flags & AMDGPU_GEM_CREATE_NO_CPU_ACCESS))
 		bo->flags |= AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED;
@@ -983,6 +987,7 @@ int amdgpu_bo_pin_restricted(struct amdgpu_bo *bo, u32 domain,
  */
 int amdgpu_bo_pin(struct amdgpu_bo *bo, u32 domain)
 {
+	bo->flags |= AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS;
 	return amdgpu_bo_pin_restricted(bo, domain, 0, 0);
 }