asahi: Add drm-shim implementation

Forked off from v3d's. This gets us a render node which is good enough for
shader-db.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19540>

src/asahi/drm-shim/asahi_noop.c

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2022 Alyssa Rosenzweig
+ * Copyright © 2018 Broadcom
+ *
+ * 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.
+ */
+
+#include "drm-shim/drm_shim.h"
+
+bool drm_shim_driver_prefers_first_render_node = true;
+
+static ioctl_fn_t driver_ioctls[] = {
+   /* The Asahi Linux UAPI is not yet upstream */
+};
+
+void
+drm_shim_driver_init(void)
+{
+   shim_device.bus_type = DRM_BUS_PLATFORM;
+   shim_device.driver_name = "asahi";
+   shim_device.driver_ioctls = driver_ioctls;
+   shim_device.driver_ioctl_count = ARRAY_SIZE(driver_ioctls);
+
+   drm_shim_override_file("DRIVER=asahi\n"
+         "OF_FULLNAME=/soc/agx\n"
+         "OF_COMPATIBLE_0=apple,gpu-g13g\n"
+         "OF_COMPATIBLE_N=1\n",
+         "/sys/dev/char/%d:%d/device/uevent", DRM_MAJOR,
+         render_node_minor);
+}

src/asahi/drm-shim/meson.build

@@ -0,0 +1,28 @@
+# Copyright © 2019 Broadcom
+#
+# 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 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.
+
+libasahi_noop_drm_shim = shared_library(
+  'asahi_noop_drm_shim',
+  'asahi_noop.c',
+  include_directories: [inc_include, inc_src],
+  dependencies: dep_drm_shim,
+  gnu_symbol_visibility : 'hidden',
+  install : true,
+)

src/asahi/meson.build

@@ -26,3 +26,7 @@ inc_asahi = include_directories([
 subdir('layout')
 subdir('lib')
 subdir('compiler')
+
+if with_tools.contains('drm-shim')
+  subdir('drm-shim')
+endif