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Subject[PATCH 5.4 044/434] drm/virtio: switch virtio_gpu_wait_ioctl() to gem helper.
Date
From: Gerd Hoffmann <kraxel@redhat.com>

[ Upstream commit 29cf12394c0565d7eb1685bf0c1b4749aa6a8b66 ]

Use drm_gem_reservation_object_wait() in virtio_gpu_wait_ioctl().
This also makes the ioctl run lockless.

v9: fix return value.
v5: handle lookup failure.
v2: use reservation_object_test_signaled_rcu for VIRTGPU_WAIT_NOWAIT.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20190829103301.3539-3-kraxel@redhat.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/virtio/virtgpu_ioctl.c | 28 +++++++++++++++-----------
1 file changed, 16 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 0a88ef11b9d3..a662394f6892 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -463,25 +463,29 @@ 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 *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)
+ obj = drm_gem_object_lookup(file, args->handle);
+ if (obj == NULL)
return -ENOENT;

- qobj = gem_to_virtio_gpu_obj(gobj);
-
- if (args->flags & VIRTGPU_WAIT_NOWAIT)
- nowait = true;
- ret = virtio_gpu_object_wait(qobj, nowait);
+ 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;

- drm_gem_object_put_unlocked(gobj);
+ drm_gem_object_put_unlocked(obj);
return ret;
}

--
2.20.1


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