ui/egl: implement display and EGL cleanup

Add egl_cleanup() to tear down the EGL render node context, GBM device,
and EGL display. Add egl_headless_cleanup() to unregister listeners,
destroy framebuffers, and free per-console state tracked via a new
GPtrArray.

Reviewed-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-ID: <20260623-b4-ui-v4-19-4656aec3398d@redhat.com>

include/ui/egl-helpers.h

@@ -81,6 +81,7 @@ EGLContext qemu_egl_init_ctx(void);
 bool qemu_egl_has_dmabuf(void);
 
 bool egl_init(const char *rendernode, DisplayGLMode mode, Error **errp);
+void egl_cleanup(void);
 
 const char *qemu_egl_get_error_string(void);
 

ui/egl-headless.c

@@ -9,6 +9,7 @@
 
 typedef struct egl_dpy {
     DisplayChangeListener dcl;
+    DisplayGLCtx *ctx;
     DisplaySurface *ds;
     QemuGLShader *gls;
     egl_fb guest_fb;
@@ -19,6 +20,8 @@ typedef struct egl_dpy {
     uint32_t pos_y;
 } egl_dpy;
 
+static GPtrArray *egl_dpys;
+
 /* ------------------------------------------------------------------ */
 
 static void egl_refresh(DisplayChangeListener *dcl)
@@ -220,6 +223,8 @@ static void egl_headless_init(DisplayState *ds, DisplayOptions *opts)
     egl_dpy *edpy;
     int idx;
 
+    egl_dpys = g_ptr_array_new();
+
     for (idx = 0;; idx++) {
         DisplayGLCtx *ctx;
 
@@ -232,15 +237,41 @@ static void egl_headless_init(DisplayState *ds, DisplayOptions *opts)
         edpy->gls = qemu_gl_init_shader();
         ctx = g_new0(DisplayGLCtx, 1);
         ctx->ops = &eglctx_ops;
+        edpy->ctx = ctx;
         qemu_console_set_display_gl_ctx(con, ctx);
         qemu_console_register_listener(con, &edpy->dcl, &egl_ops);
+        g_ptr_array_add(egl_dpys, edpy);
     }
 }
 
+static void egl_headless_cleanup(void)
+{
+    if (!egl_dpys) {
+        return;
+    }
+
+    for (guint i = 0; i < egl_dpys->len; i++) {
+        egl_dpy *edpy = g_ptr_array_index(egl_dpys, i);
+
+        qemu_console_unregister_listener(&edpy->dcl);
+        qemu_console_set_display_gl_ctx(edpy->dcl.con, NULL);
+        egl_fb_destroy(&edpy->guest_fb);
+        egl_fb_destroy(&edpy->cursor_fb);
+        egl_fb_destroy(&edpy->blit_fb);
+        qemu_gl_fini_shader(edpy->gls);
+        g_free(edpy->ctx);
+        g_free(edpy);
+    }
+    g_clear_pointer(&egl_dpys, g_ptr_array_unref);
+
+    egl_cleanup();
+}
+
 static QemuDisplay qemu_display_egl = {
     .type       = DISPLAY_TYPE_EGL_HEADLESS,
     .early_init = early_egl_headless_init,
     .init       = egl_headless_init,
+    .cleanup    = egl_headless_cleanup,
 };
 
 static void register_egl(void)

ui/egl-helpers.c

@@ -733,3 +733,22 @@ bool egl_init(const char *rendernode, DisplayGLMode mode, Error **errp)
     display_opengl = 1;
     return true;
 }
+
+void egl_cleanup(void)
+{
+    if (qemu_egl_rn_ctx) {
+        eglDestroyContext(qemu_egl_display, qemu_egl_rn_ctx);
+        qemu_egl_rn_ctx = NULL;
+    }
+
+#ifdef CONFIG_GBM
+    g_clear_pointer(&qemu_egl_rn_gbm_dev, gbm_device_destroy);
+    g_clear_fd(&qemu_egl_rn_fd, NULL);
+#endif
+
+    if (qemu_egl_display) {
+        eglReleaseThread();
+        eglTerminate(qemu_egl_display);
+        qemu_egl_display = NULL;
+    }
+}