[0/1] Implement device_attach for virtio gpu

Message

Zhang, Julia Jan. 10, 2024, 9:56 a.m. UTC

To realize dGPU prime feature for virtio gpu, we are trying let dGPU import
vram object of virtio gpu. But this feature would finally call function
virtio_dma_buf_ops.device_attach(), which was set as drm_gem_map_attach().
drm_gem_map_attach() requires drm_gem_object_funcs.get_sg_table to be
implemented, or else return ENOSYS. But virtio gpu driver has not
implemented it for vram object and actually vram object does not require
it. So this add a new implementation of device_attach() to call
drm_gem_map_attach() for shmem object and return 0 for vram object as it
actually did before the requirement was added.

Julia Zhang (1):
  drm/virtio: Implement device_attach

 drivers/gpu/drm/virtio/virtgpu_prime.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)