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drm/virtio: implement prime export

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Just run drm_prime_pages_to_sg() on the ttm pages list to get an
sg_table for export.  The pages list is created at object initialization
time, so there should be no need to handle an unpopulated page list.
Add a sanity check nevertheless.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Noralf Trønnes <noralf@tronnes.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20190227144441.6755-4-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann
2019-02-27 15:44:41 +01:00
parent 873f51d434
commit 98f41dc3b3
3 changed files with 15 additions and 0 deletions
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12
drivers/gpu/drm/virtio/virtgpu_prime.c
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@@ -28,6 +28,18 @@
* device that might share buffers with virtgpu
*/
struct sg_table *virtgpu_gem_prime_get_sg_table(struct drm_gem_object *obj)
{
struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
if (!bo->tbo.ttm->pages || !bo->tbo.ttm->num_pages)
/* should not happen */
return ERR_PTR(-EINVAL);
return drm_prime_pages_to_sg(bo->tbo.ttm->pages,
bo->tbo.ttm->num_pages);
}
void *virtgpu_gem_prime_vmap(struct drm_gem_object *obj)
{
struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);