[Qemu-devel] [PATCH v2 6/6] virtio-gpu: block any rendering until client (ui) is done

[Gerd Hoffmann <kraxel@redhat.com>]

Wire up gl_block callback, so ui code can request to stop
virtio-gpu rendering.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/display/virtio-gpu-3d.c     |  5 +++++
 hw/display/virtio-gpu.c        | 11 +++++++++++
 hw/display/virtio-vga.c        | 10 ++++++++++
 include/hw/virtio/virtio-gpu.h |  1 +
 4 files changed, 27 insertions(+)

diff --git a/hw/display/virtio-gpu-3d.c b/hw/display/virtio-gpu-3d.c
index d6487f7..8906316 100644
--- a/hw/display/virtio-gpu-3d.c
+++ b/hw/display/virtio-gpu-3d.c
@@ -382,6 +382,11 @@ void virtio_gpu_virgl_process_cmd(VirtIOGPU *g,
 {
     VIRTIO_GPU_FILL_CMD(cmd->cmd_hdr);
 
+    cmd->waiting = g->renderer_blocked;
+    if (cmd->waiting) {
+        return;
+    }
+
     virgl_renderer_force_ctx_0();
     switch (cmd->cmd_hdr.type) {
     case VIRTIO_GPU_CMD_CTX_CREATE:
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index e341d6e..ce02194 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -896,11 +896,22 @@ static int virtio_gpu_ui_info(void *opaque, uint32_t idx, QemuUIInfo *info)
     return 0;
 }
 
+static void virtio_gpu_gl_block(void *opaque, bool block)
+{
+    VirtIOGPU *g = opaque;
+
+    g->renderer_blocked = block;
+    if (!block) {
+        virtio_gpu_process_cmdq(g);
+    }
+}
+
 const GraphicHwOps virtio_gpu_ops = {
     .invalidate = virtio_gpu_invalidate_display,
     .gfx_update = virtio_gpu_update_display,
     .text_update = virtio_gpu_text_update,
     .ui_info = virtio_gpu_ui_info,
+    .gl_block = virtio_gpu_gl_block,
 };
 
 static void virtio_gpu_device_realize(DeviceState *qdev, Error **errp)
diff --git a/hw/display/virtio-vga.c b/hw/display/virtio-vga.c
index f7e539f..255d419 100644
--- a/hw/display/virtio-vga.c
+++ b/hw/display/virtio-vga.c
@@ -65,11 +65,21 @@ static int virtio_vga_ui_info(void *opaque, uint32_t idx, QemuUIInfo *info)
     return -1;
 }
 
+static void virtio_vga_gl_block(void *opaque, bool block)
+{
+    VirtIOVGA *vvga = opaque;
+
+    if (virtio_gpu_ops.gl_block) {
+        virtio_gpu_ops.gl_block(&vvga->vdev, block);
+    }
+}
+
 static const GraphicHwOps virtio_vga_ops = {
     .invalidate = virtio_vga_invalidate_display,
     .gfx_update = virtio_vga_update_display,
     .text_update = virtio_vga_text_update,
     .ui_info = virtio_vga_ui_info,
+    .gl_block = virtio_vga_gl_block,
 };
 
 /* VGA device wrapper around PCI device around virtio GPU */
diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
index f6cae0b..13b0ab0 100644
--- a/include/hw/virtio/virtio-gpu.h
+++ b/include/hw/virtio/virtio-gpu.h
@@ -107,6 +107,7 @@ typedef struct VirtIOGPU {
 
     bool use_virgl_renderer;
     bool renderer_inited;
+    bool renderer_blocked;
     QEMUTimer *fence_poll;
     QEMUTimer *print_stats;
 
-- 
1.8.3.1