From 7082e7a438db2abf13e4e1fa904875034de88b6b Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Thu, 12 Dec 2019 13:53:45 +0100 Subject: drm/virtio: batch display update commands. 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 Reviewed-by: Chia-I Wu Link: http://patchwork.freedesktop.org/patch/msgid/20191212125346.8334-3-kraxel@redhat.com --- drivers/gpu/drm/virtio/virtgpu_vq.c | 23 +++++++++++++++++++++-- 1 file changed, 21 insertions(+), 2 deletions(-) (limited to 'drivers/gpu/drm/virtio/virtgpu_vq.c') diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c index 9274c4063c70..5914e79d3429 100644 --- a/drivers/gpu/drm/virtio/virtgpu_vq.c +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c @@ -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) { -- cgit