linux-kernel - [PATCH v2 11/12] drm/virtio: rework virtio_gpu_object

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Date:   Tue, 18 Jun 2019 15:58:19 +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 v2 11/12] drm/virtio: rework virtio_gpu_object_create fencing even more.

Now with ttm initialization being out of the way we can simplify
virtio_gpu_object_create fencing even more.  No need to check whenever
the command is still running after ttm_bo_init() returned.  We have a
fully initialized gem bo before we kick off the resource creation
command, so we can simply add the fence to the bo's reservation object
beforehand.

Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
---
 drivers/gpu/drm/virtio/virtgpu_object.c | 27 +++++++++----------------
 1 file changed, 9 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c
index d0e328db0a55..4301456f087f 100644
--- a/drivers/gpu/drm/virtio/virtgpu_object.c
+++ b/drivers/gpu/drm/virtio/virtgpu_object.c
@@ -120,30 +120,21 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
 	}
 	bo->dumb = params->dumb;
 
-	if (params->virgl) {
-		virtio_gpu_cmd_resource_create_3d(vgdev, bo, params, fence);
-	} else {
-		virtio_gpu_cmd_create_resource(vgdev, bo, params, fence);
-	}
-
 	if (fence) {
-		struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
 		struct drm_gem_object *obj = &bo->base.base;
 		struct ww_acquire_ctx ticket;
-		unsigned long irq_flags;
 
-		drm_gem_object_get(obj);
 		ret = drm_gem_lock_reservations(&obj, 1, &ticket);
-		if (ret == 0) {
-			spin_lock_irqsave(&drv->lock, irq_flags);
-			if (!virtio_fence_signaled(&fence->f))
-				/* virtio create command still in flight */
-				reservation_object_add_excl_fence(obj->resv,
-								  &fence->f);
-			spin_unlock_irqrestore(&drv->lock, irq_flags);
-		}
+		if (ret == 0)
+			reservation_object_add_excl_fence(obj->resv,
+							  &fence->f);
 		drm_gem_unlock_reservations(&obj, 1, &ticket);
-		drm_gem_object_put_unlocked(obj);
+	}
+
+	if (params->virgl) {
+		virtio_gpu_cmd_resource_create_3d(vgdev, bo, params, fence);
+	} else {
+		virtio_gpu_cmd_create_resource(vgdev, bo, params, fence);
 	}
 
 	ret = virtio_gpu_object_attach(vgdev, bo, NULL);
-- 
2.18.1