drivers/gpu/drm/virtio/virtgpu_object.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/virtio/virtgpu_object.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/virtio/virtgpu_object.c
Extension
.c
Size
7617 bytes
Lines
274
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

for_each_sgtable_dma_sg(pages, sg, si) {
			(*ents)[si].addr = cpu_to_le64(sg_dma_address(sg));
			(*ents)[si].length = cpu_to_le32(sg_dma_len(sg));
			(*ents)[si].padding = 0;
		}
	} else {
		for_each_sgtable_sg(pages, sg, si) {
			(*ents)[si].addr = cpu_to_le64(sg_phys(sg));
			(*ents)[si].length = cpu_to_le32(sg->length);
			(*ents)[si].padding = 0;
		}
	}

	return 0;
}

int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
			     struct virtio_gpu_object_params *params,
			     struct virtio_gpu_object **bo_ptr,
			     struct virtio_gpu_fence *fence)
{
	struct virtio_gpu_object_array *objs = NULL;
	struct drm_gem_shmem_object *shmem_obj;
	struct virtio_gpu_object *bo;
	struct virtio_gpu_mem_entry *ents = NULL;
	unsigned int nents;
	int ret;

	*bo_ptr = NULL;

	params->size = roundup(params->size, PAGE_SIZE);
	shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
	if (IS_ERR(shmem_obj))
		return PTR_ERR(shmem_obj);
	bo = gem_to_virtio_gpu_obj(&shmem_obj->base);

	ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
	if (ret < 0)
		goto err_free_gem;

	bo->dumb = params->dumb;

	ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);
	if (ret != 0)
		goto err_put_id;

	if (fence) {
		ret = -ENOMEM;
		objs = virtio_gpu_array_alloc(1);
		if (!objs)
			goto err_free_entry;
		virtio_gpu_array_add_obj(objs, &bo->base.base);

		ret = virtio_gpu_array_lock_resv(objs);
		if (ret != 0)
			goto err_put_objs;
	}

	if (params->blob) {
		if (params->blob_mem == VIRTGPU_BLOB_MEM_GUEST)
			bo->guest_blob = true;

		virtio_gpu_cmd_resource_create_blob(vgdev, bo, params,
						    ents, nents);
	} else if (params->virgl) {
		virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
						  objs, fence);
		virtio_gpu_object_attach(vgdev, bo, ents, nents);
	} else {
		virtio_gpu_cmd_create_resource(vgdev, bo, params,
					       objs, fence);
		virtio_gpu_object_attach(vgdev, bo, ents, nents);
	}

	*bo_ptr = bo;
	return 0;

err_put_objs:
	virtio_gpu_array_put_free(objs);
err_free_entry:
	kvfree(ents);
err_put_id:
	virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
err_free_gem:
	drm_gem_shmem_free(shmem_obj);
	return ret;
}

Annotation

Implementation Notes