From a8bca51c83b96348ec9b6dadd38f6dac3802ae4e Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Fri, 14 Feb 2020 13:55:31 +0100
Subject: drm/virtio: notify before waiting
Git-commit: fcdd19b85c7bb800ec23c9dff15092a7004cfd3f
Patch-mainline: v5.7-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322
Before we are going to wait for virtqueue entries becoming available
call virtio_gpu_notify() to make sure the host has seen everything
we've submitted.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20200214125535.26349-3-kraxel@redhat.com
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/virtio/virtgpu_vq.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
index 6cc259cfa517..653efb26bcd9 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -346,6 +346,7 @@ static void virtio_gpu_queue_ctrl_sgs(struct virtio_gpu_device *vgdev,
if (vq->num_free < elemcnt) {
spin_unlock(&vgdev->ctrlq.qlock);
+ virtio_gpu_notify(vgdev);
wait_event(vgdev->ctrlq.ack_queue, vq->num_free >= elemcnt);
goto again;
}
--
2.28.0