drm/amdgpu: Use preemptible placement for KFD

KFD userptr BOs and SG BOs used for DMA mappings can be preempted with
CWSR. Therefore we can use preemptible placement and avoid unwanted
evictions due to GTT accounting.
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -621,8 +621,8 @@ kfd_mem_attach_userptr(struct amdgpu_device *adev, struct kgd_mem *mem,
 
 	ret = amdgpu_gem_object_create(adev, bo_size, 1,
 				       AMDGPU_GEM_DOMAIN_CPU,
-				       0, ttm_bo_type_sg,
-				       mem->bo->tbo.base.resv,
+				       AMDGPU_GEM_CREATE_PREEMPTIBLE,
+				       ttm_bo_type_sg, mem->bo->tbo.base.resv,
 				       &gobj);
 	if (ret)
 		return ret;
@@ -662,6 +662,7 @@ kfd_mem_attach_dmabuf(struct amdgpu_device *adev, struct kgd_mem *mem,
 	dma_buf_put(mem->dmabuf);
 
 	*bo = gem_to_amdgpu_bo(gobj);
+	(*bo)->flags |= AMDGPU_GEM_CREATE_PREEMPTIBLE;
 	(*bo)->parent = amdgpu_bo_ref(mem->bo);
 
 	return 0;
@@ -1410,7 +1411,7 @@ int amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(
 	} else if (flags & KFD_IOC_ALLOC_MEM_FLAGS_USERPTR) {
 		domain = AMDGPU_GEM_DOMAIN_GTT;
 		alloc_domain = AMDGPU_GEM_DOMAIN_CPU;
-		alloc_flags = 0;
+		alloc_flags = AMDGPU_GEM_CREATE_PREEMPTIBLE;
 		if (!offset || !*offset)
 			return -EINVAL;
 		user_addr = untagged_addr(*offset);