[PATCH 09/27] ui: simplify gl unblock & flush

[marcandre.lureau@redhat.com]

From: Marc-André Lureau <marcandre.lureau@redhat.com>

GraphicHw.gl_flushed was introduced to notify the
device (vhost-user-gpu) that the GL resources (the display scanout) are
no longer needed.

It was decoupled from QEMU own gl-blocking mechanism, but that
difference isn't really helping. Instead, we can reuse QEMU gl-blocking
and notify virtio_gpu_gl_flueshd() when unblocking (to unlock
vhost-user-gpu).

An extra block/unblock is added arount dpy_gl_update() so existing
backends that don't block will have the flush event handled. It will
also help when there are no backends associated.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 include/ui/console.h         |  2 --
 hw/display/vhost-user-gpu.c  |  2 +-
 hw/display/virtio-gpu-base.c |  5 ++++-
 hw/display/virtio-vga.c      | 11 -----------
 ui/console.c                 | 12 +++---------
 ui/gtk-egl.c                 |  1 -
 ui/gtk-gl-area.c             |  1 -
 ui/sdl2-gl.c                 |  2 --
 ui/spice-display.c           |  1 -
 9 files changed, 8 insertions(+), 29 deletions(-)

diff --git a/include/ui/console.h b/include/ui/console.h
index 9391fb052b..a8c2b9f479 100644
--- a/include/ui/console.h
+++ b/include/ui/console.h
@@ -393,7 +393,6 @@ typedef struct GraphicHwOps {
     void (*update_interval)(void *opaque, uint64_t interval);
     int (*ui_info)(void *opaque, uint32_t head, QemuUIInfo *info);
     void (*gl_block)(void *opaque, bool block);
-    void (*gl_flushed)(void *opaque);
 } GraphicHwOps;
 
 QemuConsole *graphic_console_init(DeviceState *dev, uint32_t head,
@@ -409,7 +408,6 @@ void graphic_hw_update_done(QemuConsole *con);
 void graphic_hw_invalidate(QemuConsole *con);
 void graphic_hw_text_update(QemuConsole *con, console_ch_t *chardata);
 void graphic_hw_gl_block(QemuConsole *con, bool block);
-void graphic_hw_gl_flushed(QemuConsole *con);
 
 void qemu_console_early_init(void);
 
diff --git a/hw/display/vhost-user-gpu.c b/hw/display/vhost-user-gpu.c
index a01f9315e1..a2a011e9cc 100644
--- a/hw/display/vhost-user-gpu.c
+++ b/hw/display/vhost-user-gpu.c
@@ -254,8 +254,8 @@ vhost_user_gpu_handle_display(VhostUserGPU *g, VhostUserGpuMsg *msg)
             vhost_user_gpu_unblock(g);
             break;
         }
-        dpy_gl_update(con, m->x, m->y, m->width, m->height);
         g->backend_blocked = true;
+        dpy_gl_update(con, m->x, m->y, m->width, m->height);
         break;
     }
     case VHOST_USER_GPU_UPDATE: {
diff --git a/hw/display/virtio-gpu-base.c b/hw/display/virtio-gpu-base.c
index 25f8920fdb..ee2753001a 100644
--- a/hw/display/virtio-gpu-base.c
+++ b/hw/display/virtio-gpu-base.c
@@ -118,6 +118,10 @@ virtio_gpu_gl_block(void *opaque, bool block)
         g->renderer_blocked--;
     }
     assert(g->renderer_blocked >= 0);
+
+    if (!block && g->renderer_blocked == 0) {
+        virtio_gpu_gl_flushed(g);
+    }
 }
 
 static int
@@ -144,7 +148,6 @@ static const GraphicHwOps virtio_gpu_ops = {
     .text_update = virtio_gpu_text_update,
     .ui_info = virtio_gpu_ui_info,
     .gl_block = virtio_gpu_gl_block,
-    .gl_flushed = virtio_gpu_gl_flushed,
 };
 
 bool
diff --git a/hw/display/virtio-vga.c b/hw/display/virtio-vga.c
index d3c6404061..b071909b68 100644
--- a/hw/display/virtio-vga.c
+++ b/hw/display/virtio-vga.c
@@ -68,16 +68,6 @@ static void virtio_vga_base_gl_block(void *opaque, bool block)
     }
 }
 
-static void virtio_vga_base_gl_flushed(void *opaque)
-{
-    VirtIOVGABase *vvga = opaque;
-    VirtIOGPUBase *g = vvga->vgpu;
-
-    if (g->hw_ops->gl_flushed) {
-        g->hw_ops->gl_flushed(g);
-    }
-}
-
 static int virtio_vga_base_get_flags(void *opaque)
 {
     VirtIOVGABase *vvga = opaque;
@@ -93,7 +83,6 @@ static const GraphicHwOps virtio_vga_base_ops = {
     .text_update = virtio_vga_base_text_update,
     .ui_info = virtio_vga_base_ui_info,
     .gl_block = virtio_vga_base_gl_block,
-    .gl_flushed = virtio_vga_base_gl_flushed,
 };
 
 static const VMStateDescription vmstate_virtio_vga_base = {
diff --git a/ui/console.c b/ui/console.c
index 808f82fa64..18311707bd 100644
--- a/ui/console.c
+++ b/ui/console.c
@@ -318,15 +318,6 @@ void graphic_hw_gl_block(QemuConsole *con, bool block)
     }
 }
 
-void graphic_hw_gl_flushed(QemuConsole *con)
-{
-    assert(con != NULL);
-
-    if (con->hw_ops->gl_flushed) {
-        con->hw_ops->gl_flushed(con->hw);
-    }
-}
-
 int qemu_console_get_window_id(QemuConsole *con)
 {
     return con->window_id;
@@ -1953,7 +1944,10 @@ void dpy_gl_update(QemuConsole *con,
                    uint32_t x, uint32_t y, uint32_t w, uint32_t h)
 {
     assert(con->gl);
+
+    graphic_hw_gl_block(con, true);
     con->gl->ops->dpy_gl_update(con->gl, x, y, w, h);
+    graphic_hw_gl_block(con, false);
 }
 
 /***********************************************************/
diff --git a/ui/gtk-egl.c b/ui/gtk-egl.c
index 2a2e6d3a17..48603abfbd 100644
--- a/ui/gtk-egl.c
+++ b/ui/gtk-egl.c
@@ -94,7 +94,6 @@ void gd_egl_draw(VirtualConsole *vc)
     }
 
     glFlush();
-    graphic_hw_gl_flushed(vc->gfx.dcl.con);
 }
 
 void gd_egl_update(DisplayChangeListener *dcl,
diff --git a/ui/gtk-gl-area.c b/ui/gtk-gl-area.c
index dd5783fec7..e895938a96 100644
--- a/ui/gtk-gl-area.c
+++ b/ui/gtk-gl-area.c
@@ -72,7 +72,6 @@ void gd_gl_area_draw(VirtualConsole *vc)
     }
 
     glFlush();
-    graphic_hw_gl_flushed(vc->gfx.dcl.con);
 }
 
 void gd_gl_area_update(DisplayChangeListener *dcl,
diff --git a/ui/sdl2-gl.c b/ui/sdl2-gl.c
index a21d2deed9..5b950fbbea 100644
--- a/ui/sdl2-gl.c
+++ b/ui/sdl2-gl.c
@@ -58,7 +58,6 @@ static void sdl2_gl_render_surface(struct sdl2_console *scon)
 
     surface_gl_render_texture(scon->gls, scon->surface);
     SDL_GL_SwapWindow(scon->real_window);
-    graphic_hw_gl_flushed(scon->dcl.con);
 }
 
 void sdl2_gl_update(DisplayChangeListener *dcl,
@@ -241,5 +240,4 @@ void sdl2_gl_scanout_flush(DisplayChangeListener *dcl,
     egl_fb_blit(&scon->win_fb, &scon->guest_fb, !scon->y0_top);
 
     SDL_GL_SwapWindow(scon->real_window);
-    graphic_hw_gl_flushed(dcl->con);
 }
diff --git a/ui/spice-display.c b/ui/spice-display.c
index f637fd1bc6..24f5cc30f1 100644
--- a/ui/spice-display.c
+++ b/ui/spice-display.c
@@ -826,7 +826,6 @@ static void qemu_spice_gl_unblock_bh(void *opaque)
     SimpleSpiceDisplay *ssd = opaque;
 
     qemu_spice_gl_block(ssd, false);
-    graphic_hw_gl_flushed(ssd->dcl.con);
 }
 
 static void qemu_spice_gl_block_timer(void *opaque)
-- 
2.29.0