On Mon, Jun 17, 2019 at 01:14:04PM +0200, Gerd Hoffmann wrote:
> Use drm_gem_reservation_object_wait() in virtio_gpu_wait_ioctl().
Would be good to mention here that with this the wait becomes lockless, we
don't call ttm_bo_reserve/unreserve anymore.
> Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
> ---
> drivers/gpu/drm/virtio/virtgpu_ioctl.c | 18 ++++--------------
> 1 file changed, 4 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> index c0ba1ead740f..e38a6bb46cc7 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> @@ -464,23 +464,13 @@ static int virtio_gpu_wait_ioctl(struct drm_device *dev, void *data,
> struct drm_file *file)
> {
> struct drm_virtgpu_3d_wait *args = data;
> - struct drm_gem_object *gobj = NULL;
> - struct virtio_gpu_object *qobj = NULL;
> - int ret;
> - bool nowait = false;
> -
> - gobj = drm_gem_object_lookup(file, args->handle);
> - if (gobj == NULL)
> - return -ENOENT;
> -
> - qobj = gem_to_virtio_gpu_obj(gobj);
> + long timeout = 15 * HZ;
>
> if (args->flags & VIRTGPU_WAIT_NOWAIT)
> - nowait = true;
> - ret = virtio_gpu_object_wait(qobj, nowait);
> + timeout = 0;
timeout of 0 gets upgrade to a 1 jiffy wait, which is probably not what
you want here. You need to open-code ttm_bo_wait here and call
reservation_object_test_signaled_rcu() for this case.
With that fixed Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
>
> - drm_gem_object_put_unlocked(gobj);
> - return ret;
> + return drm_gem_reservation_object_wait(file, args->handle,
> + true, timeout);
> }
>
> static int virtio_gpu_get_caps_ioctl(struct drm_device *dev,
> --
> 2.18.1
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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