egl/x11: authenticate before doing chipset id ioctls

For systems without udev or sysfs that use drm ioctls in the loader
drm authentication must take place earlier or the loader will fail
"MESA-LOADER: failed to get param for i915".

Patch from Mark Kettenis.

Cc: "11.2 11.1" <mesa-stable@lists.freedesktop.org>
Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
Signed-off-by: Jonathan Gray <jsg@jsg.id.au>
[Emil Velikov: remove gratuitous white-space]
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>

1 files changed, 56 insertions, 54 deletions

diff --git a/src/egl/drivers/dri2/platform_x11.c b/src/egl/drivers/dri2/platform_x11.c
index 3ab91886e01..b6385f708da 100644
--- a/src/egl/drivers/dri2/platform_x11.c
+++ b/src/egl/drivers/dri2/platform_x11.c
@@ -542,6 +542,55 @@ dri2_x11_flush_front_buffer(__DRIdrawable * driDrawable, void *loaderPrivate)
 #endif
 }
 
+static int
+dri2_x11_authenticate(struct dri2_egl_display *dri2_dpy, uint32_t id)
+{
+   xcb_dri2_authenticate_reply_t *authenticate;
+   xcb_dri2_authenticate_cookie_t authenticate_cookie;
+   xcb_screen_iterator_t s;
+   xcb_screen_t *screen;
+   int ret = 0;
+
+   s = xcb_setup_roots_iterator(xcb_get_setup(dri2_dpy->conn));
+
+   screen = get_xcb_screen(s, dri2_dpy->screen);
+   if (!screen) {
+      _eglLog(_EGL_WARNING, "DRI2: failed to get xcb screen");
+      return -1;
+   }
+
+   authenticate_cookie =
+      xcb_dri2_authenticate_unchecked(dri2_dpy->conn, screen->root, id);
+   authenticate =
+      xcb_dri2_authenticate_reply(dri2_dpy->conn, authenticate_cookie, NULL);
+
+   if (authenticate == NULL || !authenticate->authenticated)
+      ret = -1;
+
+   free(authenticate);
+
+   return ret;
+}
+
+static EGLBoolean
+dri2_x11_local_authenticate(struct dri2_egl_display *dri2_dpy)
+{
+#ifdef HAVE_LIBDRM
+   drm_magic_t magic;
+
+   if (drmGetMagic(dri2_dpy->fd, &magic)) {
+      _eglLog(_EGL_WARNING, "DRI2: failed to get drm magic");
+      return EGL_FALSE;
+   }
+
+   if (dri2_x11_authenticate(dri2_dpy, magic) < 0) {
+      _eglLog(_EGL_WARNING, "DRI2: failed to authenticate");
+      return EGL_FALSE;
+   }
+#endif
+   return EGL_TRUE;
+}
+
 static EGLBoolean
 dri2_x11_connect(struct dri2_egl_display *dri2_dpy)
 {
@@ -630,6 +679,13 @@ dri2_x11_connect(struct dri2_egl_display *dri2_dpy)
       return EGL_FALSE;
    }
 
+   if (!dri2_x11_local_authenticate(dri2_dpy)) {
+      close(dri2_dpy->fd);
+      free(dri2_dpy->device_name);
+      free(connect);
+      return EGL_FALSE;
+   }
+
    driver_name = xcb_dri2_connect_driver_name (connect);
 
    /* If Mesa knows about the appropriate driver for this fd, then trust it.
@@ -656,57 +712,6 @@ dri2_x11_connect(struct dri2_egl_display *dri2_dpy)
    return EGL_TRUE;
 }
 
-static int
-dri2_x11_authenticate(_EGLDisplay *disp, uint32_t id)
-{
-   struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
-   xcb_dri2_authenticate_reply_t *authenticate;
-   xcb_dri2_authenticate_cookie_t authenticate_cookie;
-   xcb_screen_iterator_t s;
-   xcb_screen_t *screen;
-   int ret = 0;
-
-   s = xcb_setup_roots_iterator(xcb_get_setup(dri2_dpy->conn));
-
-   screen = get_xcb_screen(s, dri2_dpy->screen);
-   if (!screen) {
-      _eglLog(_EGL_WARNING, "DRI2: failed to get xcb screen");
-      return -1;
-   }
-
-   authenticate_cookie =
-      xcb_dri2_authenticate_unchecked(dri2_dpy->conn, screen->root, id);
-   authenticate =
-      xcb_dri2_authenticate_reply(dri2_dpy->conn, authenticate_cookie, NULL);
-
-   if (authenticate == NULL || !authenticate->authenticated)
-      ret = -1;
-
-   free(authenticate);
-   
-   return ret;
-}
-
-static EGLBoolean
-dri2_x11_local_authenticate(_EGLDisplay *disp)
-{
-#ifdef HAVE_LIBDRM
-   struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
-   drm_magic_t magic;
-
-   if (drmGetMagic(dri2_dpy->fd, &magic)) {
-      _eglLog(_EGL_WARNING, "DRI2: failed to get drm magic");
-      return EGL_FALSE;
-   }
-   
-   if (dri2_x11_authenticate(disp, magic) < 0) {
-      _eglLog(_EGL_WARNING, "DRI2: failed to authenticate");
-      return EGL_FALSE;
-   }
-#endif
-   return EGL_TRUE;
-}
-
 static EGLBoolean
 dri2_x11_add_configs_for_visuals(struct dri2_egl_display *dri2_dpy,
                                  _EGLDisplay *disp, bool supports_preserved)
@@ -1390,9 +1395,6 @@ dri2_initialize_x11_dri2(_EGLDriver *drv, _EGLDisplay *disp)
    if (!dri2_x11_connect(dri2_dpy))
       goto cleanup_conn;
 
-   if (!dri2_x11_local_authenticate(disp))
-      goto cleanup_fd;
-
    if (!dri2_load_driver(disp))
       goto cleanup_fd;