From 37625d78afdadb5e88aa4616d613f64184db41bf Mon Sep 17 00:00:00 2001 From: Wanghe Xiao Date: Sat, 25 Nov 2023 01:42:26 -0800 Subject: [PATCH] ui/gtk: prevent ui lock up when dpy_gl_update called again before current draw event occurs MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit cherry picked from commit 64f1359bd08060ffe7a5689fdcbaeec6d8a59980 A warning, "qemu: warning: console: no gl-unblock within" followed by guest scanout lockup can happen if dpy_gl_update is called in a row and the second call is made before gd_draw_event scheduled by the first call is taking place. This is because draw call returns without decrementing gl_block ref count if the dmabuf was already submitted as shown below. (gd_gl_area_draw/gd_egl_draw) if (dmabuf) { if (!dmabuf->draw_submitted) { return; } else { dmabuf->draw_submitted = false; } } So it should not schedule any redundant draw event in case draw_submitted is already set in gd_egl_fluch/gd_gl_area_scanout_flush. Cc: Gerd Hoffmann Cc: Vivek Kasireddy Signed-off-by: Dongwon Kim Reviewed-by: Marc-André Lureau Message-Id: <20221021192315.9110-1-dongwon.kim@intel.com> Signed-off-by: Gerd Hoffmann Signed-off-by: Wanghe Xiao --- ui/gtk-egl.c | 2 +- ui/gtk-gl-area.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/ui/gtk-egl.c b/ui/gtk-egl.c index 45cb67712d..0e1e5bfaaa 100644 --- a/ui/gtk-egl.c +++ b/ui/gtk-egl.c @@ -340,7 +340,7 @@ void gd_egl_flush(DisplayChangeListener *dcl, VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl); GtkWidget *area = vc->gfx.drawing_area; - if (vc->gfx.guest_fb.dmabuf) { + if (vc->gfx.guest_fb.dmabuf && !vc->gfx.guest_fb.dmabuf->draw_submitted) { graphic_hw_gl_block(vc->gfx.dcl.con, true); vc->gfx.guest_fb.dmabuf->draw_submitted = true; gtk_widget_queue_draw_area(area, x, y, w, h); diff --git a/ui/gtk-gl-area.c b/ui/gtk-gl-area.c index 01e4e74ee3..11e0cb4af2 100644 --- a/ui/gtk-gl-area.c +++ b/ui/gtk-gl-area.c @@ -246,7 +246,7 @@ void gd_gl_area_scanout_flush(DisplayChangeListener *dcl, { VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl); - if (vc->gfx.guest_fb.dmabuf) { + if (vc->gfx.guest_fb.dmabuf && !vc->gfx.guest_fb.dmabuf->draw_submitted) { graphic_hw_gl_block(vc->gfx.dcl.con, true); vc->gfx.guest_fb.dmabuf->draw_submitted = true; } -- 2.27.0