[PATCH v8 07/11] virtio-gpu: Support suspension of commands processing

[Dmitry Osipenko <dmitry.osipenko@collabora.com>]

Add new "suspended" flag to virtio_gpu_ctrl_command telling cmd
processor that it should stop processing commands and retry again
next time until flag is unset.

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
 hw/display/virtio-gpu-gl.c       | 1 +
 hw/display/virtio-gpu-rutabaga.c | 1 +
 hw/display/virtio-gpu-virgl.c    | 3 +++
 hw/display/virtio-gpu.c          | 5 +++++
 include/hw/virtio/virtio-gpu.h   | 1 +
 5 files changed, 11 insertions(+)

diff --git a/hw/display/virtio-gpu-gl.c b/hw/display/virtio-gpu-gl.c
index ba478124e2c2..a8892bcc5346 100644
--- a/hw/display/virtio-gpu-gl.c
+++ b/hw/display/virtio-gpu-gl.c
@@ -79,6 +79,7 @@ static void virtio_gpu_gl_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
         cmd->vq = vq;
         cmd->error = 0;
         cmd->finished = false;
+        cmd->suspended = false;
         QTAILQ_INSERT_TAIL(&g->cmdq, cmd, next);
         cmd = virtqueue_pop(vq, sizeof(struct virtio_gpu_ctrl_command));
     }
diff --git a/hw/display/virtio-gpu-rutabaga.c b/hw/display/virtio-gpu-rutabaga.c
index 17bf701a2163..b6e84d436fb2 100644
--- a/hw/display/virtio-gpu-rutabaga.c
+++ b/hw/display/virtio-gpu-rutabaga.c
@@ -1061,6 +1061,7 @@ static void virtio_gpu_rutabaga_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
         cmd->vq = vq;
         cmd->error = 0;
         cmd->finished = false;
+        cmd->suspended = false;
         QTAILQ_INSERT_TAIL(&g->cmdq, cmd, next);
         cmd = virtqueue_pop(vq, sizeof(struct virtio_gpu_ctrl_command));
     }
diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
index c2057b0c2147..bb9ee1eba9a0 100644
--- a/hw/display/virtio-gpu-virgl.c
+++ b/hw/display/virtio-gpu-virgl.c
@@ -670,6 +670,9 @@ void virtio_gpu_virgl_process_cmd(VirtIOGPU *g,
         break;
     }
 
+    if (cmd->suspended) {
+        return;
+    }
     if (cmd->finished) {
         return;
     }
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index 1e57a53d346c..a1bd4d6914c4 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -1054,6 +1054,10 @@ void virtio_gpu_process_cmdq(VirtIOGPU *g)
         /* process command */
         vgc->process_cmd(g, cmd);
 
+        if (cmd->suspended) {
+            break;
+        }
+
         QTAILQ_REMOVE(&g->cmdq, cmd, next);
         if (virtio_gpu_stats_enabled(g->parent_obj.conf)) {
             g->stats.requests++;
@@ -1113,6 +1117,7 @@ static void virtio_gpu_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
         cmd->vq = vq;
         cmd->error = 0;
         cmd->finished = false;
+        cmd->suspended = false;
         QTAILQ_INSERT_TAIL(&g->cmdq, cmd, next);
         cmd = virtqueue_pop(vq, sizeof(struct virtio_gpu_ctrl_command));
     }
diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
index 44c676c3ca4a..dc24360656ce 100644
--- a/include/hw/virtio/virtio-gpu.h
+++ b/include/hw/virtio/virtio-gpu.h
@@ -132,6 +132,7 @@ struct virtio_gpu_ctrl_command {
     struct virtio_gpu_ctrl_hdr cmd_hdr;
     uint32_t error;
     bool finished;
+    bool suspended;
     QTAILQ_ENTRY(virtio_gpu_ctrl_command) next;
 };
 
-- 
2.44.0