vulkan/wsi/wayland: Use per-display event queue

Calling random callbacks on the display's event queue is hostile, as
we may call into client code when it least expects it. Create our own
event queue, one per wsi_wl_display, and use that for the registry.
Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: mesa-stable@lists.freedesktop.org

src/vulkan/wsi/wsi_common_wayland.c

@@ -46,7 +46,11 @@
 struct wsi_wayland;
 
 struct wsi_wl_display {
-   struct wl_display *                          display;
+   /* The real wl_display */
+   struct wl_display *                          wl_display;
+   /* Actually a proxy wrapper around the event queue */
+   struct wl_display *                          wl_display_wrapper;
+   struct wl_event_queue *                      queue;
    struct wl_drm *                              drm;
 
    struct wsi_wayland *wsi_wl;
@@ -251,6 +255,10 @@ wsi_wl_display_destroy(struct wsi_wayland *wsi, struct wsi_wl_display *display)
    u_vector_finish(&display->formats);
    if (display->drm)
       wl_drm_destroy(display->drm);
+   if (display->wl_display_wrapper)
+      wl_proxy_wrapper_destroy(display->wl_display_wrapper);
+   if (display->queue)
+      wl_event_queue_destroy(display->queue);
    vk_free(wsi->alloc, display);
 }
 
@@ -265,26 +273,38 @@ wsi_wl_display_create(struct wsi_wayland *wsi, struct wl_display *wl_display)
 
    memset(display, 0, sizeof(*display));
 
-   display->display = wl_display;
    display->wsi_wl = wsi;
+   display->wl_display = wl_display;
 
    if (!u_vector_init(&display->formats, sizeof(VkFormat), 8))
       goto fail;
 
-   struct wl_registry *registry = wl_display_get_registry(wl_display);
+   display->queue = wl_display_create_queue(wl_display);
+   if (!display->queue)
+      goto fail;
+
+   display->wl_display_wrapper = wl_proxy_create_wrapper(wl_display);
+   if (!display->wl_display_wrapper)
+      goto fail;
+
+   wl_proxy_set_queue((struct wl_proxy *) display->wl_display_wrapper,
+                      display->queue);
+
+   struct wl_registry *registry =
+      wl_display_get_registry(display->wl_display_wrapper);
    if (!registry)
       goto fail;
 
    wl_registry_add_listener(registry, &registry_listener, display);
 
-   /* Round-rip to get the wl_drm global */
-   wl_display_roundtrip(wl_display);
+   /* Round-trip to get the wl_drm global */
+   wl_display_roundtrip_queue(display->wl_display, display->queue);
 
    if (!display->drm)
       goto fail_registry;
 
-   /* Round-rip to get wl_drm formats and capabilities */
-   wl_display_roundtrip(wl_display);
+   /* Round-trip to get wl_drm formats and capabilities */
+   wl_display_roundtrip_queue(display->wl_display, display->queue);
 
    /* We need prime support */
    if (!(display->capabilities & WL_DRM_CAPABILITY_PRIME))
@@ -561,7 +581,7 @@ wsi_wl_swapchain_acquire_next_image(struct wsi_swapchain *wsi_chain,
 {
    struct wsi_wl_swapchain *chain = (struct wsi_wl_swapchain *)wsi_chain;
 
-   int ret = wl_display_dispatch_queue_pending(chain->display->display,
+   int ret = wl_display_dispatch_queue_pending(chain->display->wl_display,
                                                chain->queue);
    /* XXX: I'm not sure if out-of-date is the right error here.  If
     * wl_display_dispatch_queue_pending fails it most likely means we got
@@ -583,7 +603,7 @@ wsi_wl_swapchain_acquire_next_image(struct wsi_swapchain *wsi_chain,
       /* This time we do a blocking dispatch because we can't go
        * anywhere until we get an event.
        */
-      int ret = wl_display_roundtrip_queue(chain->display->display,
+      int ret = wl_display_roundtrip_queue(chain->display->wl_display,
                                            chain->queue);
       if (ret < 0)
          return VK_ERROR_OUT_OF_DATE_KHR;
@@ -613,7 +633,7 @@ wsi_wl_swapchain_queue_present(struct wsi_swapchain *wsi_chain,
 
    if (chain->base.present_mode == VK_PRESENT_MODE_FIFO_KHR) {
       while (!chain->fifo_ready) {
-         int ret = wl_display_dispatch_queue(chain->display->display,
+         int ret = wl_display_dispatch_queue(chain->display->wl_display,
                                              chain->queue);
          if (ret < 0)
             return VK_ERROR_OUT_OF_DATE_KHR;
@@ -645,7 +665,7 @@ wsi_wl_swapchain_queue_present(struct wsi_swapchain *wsi_chain,
 
    chain->images[image_index].busy = true;
    wl_surface_commit(chain->surface);
-   wl_display_flush(chain->display->display);
+   wl_display_flush(chain->display->wl_display);
 
    return VK_SUCCESS;
 }
@@ -791,7 +811,7 @@ wsi_wl_surface_create_swapchain(VkIcdSurfaceBase *icd_surface,
       goto fail;
    }
 
-   chain->queue = wl_display_create_queue(chain->display->display);
+   chain->queue = wl_display_create_queue(chain->display->wl_display);
    if (!chain->queue) {
       result = VK_ERROR_INITIALIZATION_FAILED;
       goto fail;