vulkan/wsi: create a common function to compare drm devices

Effectively moves most of v3dv_wsi_can_present_on_device to the
common code to be used in other drivers.

Signed-off-by: Danylo Piliaiev <dpiliaiev@igalia.com>
Reviewed-by: Emma Anholt <emma@anholt.net>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11091>

src/broadcom/vulkan/v3dv_wsi.c

@@ -28,6 +28,7 @@
 #include "wsi_common_entrypoints.h"
 #include "vk_util.h"
 #include "wsi_common.h"
+#include "wsi_common_drm.h"
 
 static VKAPI_ATTR PFN_vkVoidFunction VKAPI_CALL
 v3dv_wsi_proc_addr(VkPhysicalDevice physicalDevice, const char *pName)
@@ -41,24 +42,7 @@ v3dv_wsi_can_present_on_device(VkPhysicalDevice _pdevice, int fd)
 {
    V3DV_FROM_HANDLE(v3dv_physical_device, pdevice, _pdevice);
 
-   drmDevicePtr fd_devinfo, display_devinfo;
+   return wsi_common_drm_devices_equal(fd, pdevice->display_fd);
-   int ret;
-
-   ret = drmGetDevice2(fd, 0, &fd_devinfo);
-   if (ret)
-      return false;
-
-   ret = drmGetDevice2(pdevice->display_fd, 0, &display_devinfo);
-   if (ret) {
-      drmFreeDevice(&fd_devinfo);
-      return false;
-   }
-
-   bool result = drmDevicesEqual(fd_devinfo, display_devinfo);
-
-   drmFreeDevice(&fd_devinfo);
-   drmFreeDevice(&display_devinfo);
-   return result;
 }
 
 VkResult

src/vulkan/wsi/wsi_common_drm.c

@@ -22,6 +22,7 @@
  */
 
 #include "wsi_common_private.h"
+#include "wsi_common_drm.h"
 #include "util/macros.h"
 #include "util/os_file.h"
 #include "util/xmlconfig.h"
@@ -34,6 +35,30 @@
 #include <stdio.h>
 #include <xf86drm.h>
 
+bool
+wsi_common_drm_devices_equal(int fd_a, int fd_b)
+{
+   drmDevicePtr device_a, device_b;
+   int ret;
+
+   ret = drmGetDevice2(fd_a, 0, &device_a);
+   if (ret)
+      return false;
+
+   ret = drmGetDevice2(fd_b, 0, &device_b);
+   if (ret) {
+      drmFreeDevice(&device_a);
+      return false;
+   }
+
+   bool result = drmDevicesEqual(device_a, device_b);
+
+   drmFreeDevice(&device_a);
+   drmFreeDevice(&device_b);
+
+   return result;
+}
+
 bool
 wsi_device_matches_drm_fd(const struct wsi_device *wsi, int drm_fd)
 {

src/vulkan/wsi/wsi_common_drm.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright © 2021 Igalia S.L.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef WSI_COMMON_DRM_H
+#define WSI_COMMON_DRM_H
+
+bool
+wsi_common_drm_devices_equal(int fd_a, int fd_b);
+
+#endif /* WSI_COMMON_DRM_H */