[PATCH 5.4 124/203] Revert "drm/virtio: switch virtio_gpu_wait_ioctl() to gem helper."

Greg Kroah-Hartman
2020-01-16T23:24:45Z

From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

This reverts commit e6733ec8948475c4b62574e452135dc629294d75 which is
commit 29cf12394c0565d7eb1685bf0c1b4749aa6a8b66 upstream.

Alistair writes:
After updating to 5.4.7 we noticed that virtio_gpu's wait ioctl
stopped working correctly.

It looks like 29cf12394c05 ("drm/virtio: switch
virtio_gpu_wait_ioctl() to gem helper.") was picked up automatically,
but it depends on 889165ad6190 ("drm/virtio: pass gem reservation
object to ttm init") from earlier in Gerd's series in Linus's tree,
which was not picked up.

Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Chia-I Wu <olvaffe@gmail.com>
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/virtio/virtgpu_ioctl.c | 28 ++++++++++++----------------
1 file changed, 12 insertions(+), 16 deletions(-)

--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -463,29 +463,25 @@ out:
}

static int virtio_gpu_wait_ioctl(struct drm_device *dev, void *data,
- struct drm_file *file)
+ struct drm_file *file)
{
struct drm_virtgpu_3d_wait *args = data;
- struct drm_gem_object *obj;
- long timeout = 15 * HZ;
+ struct drm_gem_object *gobj = NULL;
+ struct virtio_gpu_object *qobj = NULL;
int ret;
+ bool nowait = false;

- obj = drm_gem_object_lookup(file, args->handle);
- if (obj == NULL)
+ gobj = drm_gem_object_lookup(file, args->handle);
+ if (gobj == NULL)
return -ENOENT;

- if (args->flags & VIRTGPU_WAIT_NOWAIT) {
- ret = dma_resv_test_signaled_rcu(obj->resv, true);
- } else {
- ret = dma_resv_wait_timeout_rcu(obj->resv, true, true,
- timeout);
- }
- if (ret == 0)
- ret = -EBUSY;
- else if (ret > 0)
- ret = 0;
+ qobj = gem_to_virtio_gpu_obj(gobj);

- drm_gem_object_put_unlocked(obj);
+ if (args->flags & VIRTGPU_WAIT_NOWAIT)
+ nowait = true;
+ ret = virtio_gpu_object_wait(qobj, nowait);
+
+ drm_gem_object_put_unlocked(gobj);
return ret;
}