Userland: Re-organize /dev GPU nodes

Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/b401f278ad
Pull-request: https://github.com/SerenityOS/serenity/pull/13845

Userland/Demos/VirGLDemo/VirGLDemo.cpp

@@ -134,7 +134,7 @@ static Vector<VertexData> gen_vertex_data()
 static void init()
 {
     // Open the device
-    gpu_fd = open("/dev/gpu0", O_RDWR);
+    gpu_fd = open("/dev/gpu/render0", O_RDWR);
     VERIFY(gpu_fd >= 0);
     // Create a virgl context for this file descriptor
     VERIFY(ioctl(gpu_fd, VIRGL_IOCTL_CREATE_CONTEXT) >= 0);

Userland/Services/SystemServer/main.cpp

@@ -209,7 +209,11 @@ static void populate_devtmpfs_devices_based_on_devctl()
             break;
         }
         case 28: {
-            create_devtmpfs_block_device(String::formatted("/dev/gpu{}", minor_number), 0666, 28, minor_number);
+            create_devtmpfs_block_device(String::formatted("/dev/gpu/render{}", minor_number), 0666, 28, minor_number);
+            break;
+        }
+        case 226: {
+            create_devtmpfs_char_device(String::formatted("/dev/gpu/connector{}", minor_number), 0666, 226, minor_number);
             break;
         }
         case 29: {
@@ -396,6 +400,8 @@ static ErrorOr<void> prepare_synthetic_filesystems()
     TRY(Core::System::symlink("/proc/self/fd/1", "/dev/stdout"));
     TRY(Core::System::symlink("/proc/self/fd/2", "/dev/stderr"));
 
+    TRY(Core::System::mkdir("/dev/gpu", 0755));
+
     populate_devtmpfs();
 
     TRY(Core::System::mkdir("/dev/pts", 0755));