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ui/gtk: prevent ui lock up when dpy_gl_update called again before current draw event occurs 

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 <kraxel@redhat.com>
Cc: Vivek Kasireddy <vivek.kasireddy@intel.com>
Signed-off-by: Dongwon Kim <dongwon.kim@intel.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20221021192315.9110-1-dongwon.kim@intel.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Dongwon Kim 2022-10-21 12:23:15 -07:00 committed by Gerd Hoffmann
parent d68640f515
commit 64f1359bd0
2 changed files with 2 additions and 2 deletions
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2
ui/gtk-egl.c
View File

@ -341,7 +341,7 @@ 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);

2
ui/gtk-gl-area.c
View File

@ -278,7 +278,7 @@ 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;
}