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drm/virtio: batch display update commands.

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When the driver submits multiple commands in a row it makes sense to
notify the host only after submitting the last one, so the host can
process them all at once, with a single vmexit.

Add functions to enable/disable notifications to allow that.  Use the
new functions for primary plane updates.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20191212125346.8334-3-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann
2019-12-12 13:53:45 +01:00
parent 3954ff10e0
commit 7082e7a438
3 changed files with 31 additions and 2 deletions
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23
drivers/gpu/drm/virtio/virtgpu_vq.c
View File

@@ -404,8 +404,12 @@ again:
}
notify = virtio_gpu_queue_ctrl_buffer_locked(vgdev, vbuf, vout);
spin_unlock(&vgdev->ctrlq.qlock);
if (notify)
virtqueue_notify(vgdev->ctrlq.vq);
if (notify) {
if (vgdev->disable_notify)
vgdev->pending_notify = true;
else
virtqueue_notify(vgdev->ctrlq.vq);
}
if (sgt) {
sg_free_table(sgt);
@@ -413,6 +417,21 @@ again:
}
}
void virtio_gpu_disable_notify(struct virtio_gpu_device *vgdev)
{
vgdev->disable_notify = true;
}
void virtio_gpu_enable_notify(struct virtio_gpu_device *vgdev)
{
vgdev->disable_notify = false;
if (!vgdev->pending_notify)
return;
vgdev->pending_notify = false;
virtqueue_notify(vgdev->ctrlq.vq);
}
static void virtio_gpu_queue_ctrl_buffer(struct virtio_gpu_device *vgdev,
struct virtio_gpu_vbuffer *vbuf)
{