xen: re-enable refresh interval reporting for xenfb

xenfb informs the guest about the gui refresh interval so it can avoid
pointless work.  That logic was temporarely disabled for the
DisplayState reorganization.  Restore it now, with a proper interface
for it.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

hw/display/xenfb.c

@@ -78,7 +78,6 @@ struct XenFB {
     void              *pixels;
     int               fbpages;
     int               feature_update;
-    int               refresh_period;
     int               bug_trigger;
     int               have_console;
     int               do_resize;
@@ -646,7 +645,7 @@ static void xenfb_guest_copy(struct XenFB *xenfb, int x, int y, int w, int h)
     dpy_gfx_update(xenfb->c.con, x, y, w, h);
 }
 
-#if 0 /* def XENFB_TYPE_REFRESH_PERIOD */
+#ifdef XENFB_TYPE_REFRESH_PERIOD
 static int xenfb_queue_full(struct XenFB *xenfb)
 {
     struct xenfb_page *page = xenfb->c.page;
@@ -704,39 +703,7 @@ static void xenfb_update(void *opaque)
     if (xenfb->c.xendev.be_state != XenbusStateConnected)
         return;
 
-    if (xenfb->feature_update) {
-#if 0 /* XENFB_TYPE_REFRESH_PERIOD */
-        struct DisplayChangeListener *l;
-        int period = 99999999;
-        int idle = 1;
-
-	if (xenfb_queue_full(xenfb))
-	    return;
-
-        QLIST_FOREACH(l, &xenfb->c.ds->listeners, next) {
-            if (l->idle)
-                continue;
-            idle = 0;
-            if (!l->gui_timer_interval) {
-                if (period > GUI_REFRESH_INTERVAL)
-                    period = GUI_REFRESH_INTERVAL;
-            } else {
-                if (period > l->gui_timer_interval)
-                    period = l->gui_timer_interval;
-            }
-        }
-        if (idle)
-	    period = XENFB_NO_REFRESH;
-
-	if (xenfb->refresh_period != period) {
-	    xenfb_send_refresh_period(xenfb, period);
-	    xenfb->refresh_period = period;
-            xen_be_printf(&xenfb->c.xendev, 1, "refresh period: %d\n", period);
-	}
-#else
-	; /* nothing */
-#endif
-    } else {
+    if (!xenfb->feature_update) {
 	/* we don't get update notifications, thus use the
 	 * sledge hammer approach ... */
 	xenfb->up_fullscreen = 1;
@@ -785,6 +752,20 @@ static void xenfb_update(void *opaque)
     xenfb->up_fullscreen = 0;
 }
 
+static void xenfb_update_interval(void *opaque, uint64_t interval)
+{
+    struct XenFB *xenfb = opaque;
+
+    if (xenfb->feature_update) {
+#ifdef XENFB_TYPE_REFRESH_PERIOD
+        if (xenfb_queue_full(xenfb)) {
+            return;
+        }
+        xenfb_send_refresh_period(xenfb, interval);
+#endif
+    }
+}
+
 /* QEMU display state changed, so refresh the framebuffer copy */
 static void xenfb_invalidate(void *opaque)
 {
@@ -858,10 +839,6 @@ static void xenfb_handle_events(struct XenFB *xenfb)
 
 static int fb_init(struct XenDevice *xendev)
 {
-    struct XenFB *fb = container_of(xendev, struct XenFB, c.xendev);
-
-    fb->refresh_period = -1;
-
 #ifdef XENFB_TYPE_RESIZE
     xenstore_write_be_int(xendev, "feature-resize", 1);
 #endif
@@ -980,6 +957,7 @@ struct XenDevOps xen_framebuffer_ops = {
 static const GraphicHwOps xenfb_ops = {
     .invalidate  = xenfb_invalidate,
     .gfx_update  = xenfb_update,
+    .update_interval = xenfb_update_interval,
 };
 
 /*

include/ui/console.h

@@ -272,6 +272,7 @@ typedef struct GraphicHwOps {
     void (*invalidate)(void *opaque);
     void (*gfx_update)(void *opaque);
     void (*text_update)(void *opaque, console_ch_t *text);
+    void (*update_interval)(void *opaque, uint64_t interval);
 } GraphicHwOps;
 
 QemuConsole *graphic_console_init(const GraphicHwOps *ops,

ui/console.c

@@ -182,6 +182,7 @@ static void gui_update(void *opaque)
     uint64_t dcl_interval;
     DisplayState *ds = opaque;
     DisplayChangeListener *dcl;
+    int i;
 
     ds->refreshing = true;
     dpy_refresh(ds);
@@ -196,6 +197,11 @@ static void gui_update(void *opaque)
     }
     if (ds->update_interval != interval) {
         ds->update_interval = interval;
+        for (i = 0; i < nb_consoles; i++) {
+            if (consoles[i]->hw_ops->update_interval) {
+                consoles[i]->hw_ops->update_interval(consoles[i]->hw, interval);
+            }
+        }
         trace_console_refresh(interval);
     }
     ds->last_update = qemu_get_clock_ms(rt_clock);