kms/impl-device: Keep a path string around

This is useful for e.g. logging.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1488>

src/backends/native/meta-kms-device.c

@@ -225,6 +225,7 @@ typedef struct _CreateImplDeviceData
 {
   MetaKmsDevice *device;
   int fd;
+  const char *path;
 
   MetaKmsImplDevice *out_impl_device;
   GList *out_crtcs;
@@ -260,6 +261,7 @@ static MetaKmsImplDevice *
 meta_create_kms_impl_device (MetaKmsDevice  *device,
                              MetaKmsImpl    *impl,
                              int             fd,
+                             const char     *path,
                              GError        **error)
 {
   int ret;
@@ -287,6 +289,7 @@ meta_create_kms_impl_device (MetaKmsDevice  *device,
                          "device", device,
                          "impl", impl,
                          "fd", fd,
+                         "path", path,
                          "driver-name", driver_name,
                          "driver-description", driver_description,
                          NULL);
@@ -303,6 +306,7 @@ create_impl_device_in_impl (MetaKmsImpl  *impl,
   impl_device = meta_create_kms_impl_device (data->device,
                                              impl,
                                              data->fd,
+                                             data->path,
                                              error);
   if (!impl_device)
     return FALSE;
@@ -347,6 +351,7 @@ meta_kms_device_new (MetaKms            *kms,
   data = (CreateImplDeviceData) {
     .device = device,
     .fd = fd,
+    .path = path,
   };
   if (!meta_kms_run_impl_task_sync (kms, create_impl_device_in_impl, &data,
                                     error))

src/backends/native/meta-kms-impl-device.c

@@ -45,6 +45,7 @@ enum
   PROP_DEVICE,
   PROP_IMPL,
   PROP_FD,
+  PROP_PATH,
   PROP_DRIVER_NAME,
   PROP_DRIVER_DESCRIPTION,
 
@@ -60,6 +61,7 @@ typedef struct _MetaKmsImplDevicePrivate
 
   int fd;
   GSource *fd_source;
+  char *path;
 
   char *driver_name;
   char *driver_description;
@@ -158,6 +160,15 @@ meta_kms_impl_device_get_driver_description (MetaKmsImplDevice *impl_device)
   return priv->driver_description;
 }
 
+const char *
+meta_kms_impl_device_get_path (MetaKmsImplDevice *impl_device)
+{
+  MetaKmsImplDevicePrivate *priv =
+    meta_kms_impl_device_get_instance_private (impl_device);
+
+  return priv->path;
+}
+
 static void
 page_flip_handler (int           fd,
                    unsigned int  sequence,
@@ -677,6 +688,9 @@ meta_kms_impl_device_get_property (GObject    *object,
     case PROP_FD:
       g_value_set_int (value, priv->fd);
       break;
+    case PROP_PATH:
+      g_value_set_string (value, priv->path);
+      break;
     case PROP_DRIVER_NAME:
       g_value_set_string (value, priv->driver_name);
       break;
@@ -710,6 +724,9 @@ meta_kms_impl_device_set_property (GObject      *object,
     case PROP_FD:
       priv->fd = g_value_get_int (value);
       break;
+    case PROP_PATH:
+      priv->path = g_value_dup_string (value);
+      break;
     case PROP_DRIVER_NAME:
       priv->driver_name = g_value_dup_string (value);
       break;
@@ -738,6 +755,7 @@ meta_kms_impl_device_finalize (GObject *object)
                     (GDestroyNotify) meta_kms_mode_free);
   g_free (priv->driver_name);
   g_free (priv->driver_description);
+  g_free (priv->path);
 
   G_OBJECT_CLASS (meta_kms_impl_device_parent_class)->finalize (object);
 }
@@ -824,6 +842,14 @@ meta_kms_impl_device_class_init (MetaKmsImplDeviceClass *klass)
                       G_PARAM_READWRITE |
                       G_PARAM_CONSTRUCT_ONLY |
                       G_PARAM_STATIC_STRINGS);
+  obj_props[PROP_PATH] =
+    g_param_spec_string ("path",
+                         "path",
+                         "DRM device file path",
+                         NULL,
+                         G_PARAM_READWRITE |
+                         G_PARAM_CONSTRUCT_ONLY |
+                         G_PARAM_STATIC_STRINGS);
   obj_props[PROP_DRIVER_NAME] =
     g_param_spec_string ("driver-name",
                          "driver-name",

src/backends/native/meta-kms-impl-device.h

@@ -83,6 +83,8 @@ const char * meta_kms_impl_device_get_driver_name (MetaKmsImplDevice *impl_devic
 
 const char * meta_kms_impl_device_get_driver_description (MetaKmsImplDevice *impl_device);
 
+const char * meta_kms_impl_device_get_path (MetaKmsImplDevice *impl_device);
+
 gboolean meta_kms_impl_device_dispatch (MetaKmsImplDevice  *impl_device,
                                         GError            **error);