linux-kernel - [PATCH v3 03/12] drm/virtio: switch virtio_gpu_wait

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Date:   Wed, 19 Jun 2019 11:04:11 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Gerd Hoffmann <kraxel@...hat.com>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        virtualization@...ts.linux-foundation.org (open list:VIRTIO GPU DRIVER),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v3 03/12] drm/virtio: switch virtio_gpu_wait_ioctl() to gem helper.

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

v2: use reservation_object_test_signaled_rcu for VIRTGPU_WAIT_NOWAIT.

Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>
---
 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);
+		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