On Wed, Jun 19, 2019 at 11:07 PM Gerd Hoffmann <kraxel@xxxxxxxxxx> wrote:
>
> Use drm_gem_reservation_object_wait() in virtio_gpu_wait_ioctl().
> This also makes the ioctl run lockless.
The userspace has a BO cache to avoid freeing BOs immediately but to
reuse them on next allocations. The BO cache checks if a BO is busy
before reuse, and I am seeing a big negative perf impact because of
slow virtio_gpu_wait_ioctl. I wonder if this helps.
>
> v2: use reservation_object_test_signaled_rcu for VIRTGPU_WAIT_NOWAIT.
>
> Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
> Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> ---
> drivers/gpu/drm/virtio/virtgpu_ioctl.c | 24 ++++++++++--------------
> 1 file changed, 10 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> index ac60be9b5c19..313c770ea2c5 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> @@ -464,23 +464,19 @@ 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;
> + struct drm_gem_object *obj;
> + long timeout = 15 * HZ;
> int ret;
> - bool nowait = false;
>
> - gobj = drm_gem_object_lookup(file, args->handle);
> - if (gobj == NULL)
> - return -ENOENT;
> + if (args->flags & VIRTGPU_WAIT_NOWAIT) {
> + obj = drm_gem_object_lookup(file, args->handle);
Don't we need a NULL check here?
> + ret = reservation_object_test_signaled_rcu(obj->resv, true);
> + drm_gem_object_put_unlocked(obj);
> + return ret ? 0 : -EBUSY;
> + }
>
> - qobj = gem_to_virtio_gpu_obj(gobj);
> -
> - if (args->flags & VIRTGPU_WAIT_NOWAIT)
> - nowait = true;
> - ret = virtio_gpu_object_wait(qobj, nowait);
> -
> - 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
>
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