[RFC 1/5] drm/netlink: Add netlink infrastructure

[Aravind Iddamsetty]

Define the netlink commands and attributes that can be commonly used
across by drm drivers.

Signed-off-by: Aravind Iddamsetty <aravind.iddamsetty at intel.com>
---
 include/uapi/drm/drm_netlink.h | 68 ++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 include/uapi/drm/drm_netlink.h

diff --git a/include/uapi/drm/drm_netlink.h b/include/uapi/drm/drm_netlink.h
new file mode 100644
index 000000000000..28e7a334d0c7
--- /dev/null
+++ b/include/uapi/drm/drm_netlink.h
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2023 Intel Corporation
+ *
+ * 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
+ * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS 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 _DRM_NETLINK_H_
+#define _DRM_NETLINK_H_
+
+#include <linux/netdevice.h>
+#include <net/genetlink.h>
+#include <net/sock.h>
+
+#define DRM_GENL_VERSION 1
+
+enum error_cmds {
+	DRM_CMD_UNSPEC,
+	/* command to list all errors names with config-id */
+	DRM_CMD_QUERY,
+	/* command to get a counter for a specific error */
+	DRM_CMD_READ_ONE,
+	/* command to get counters of all errors */
+	DRM_CMD_READ_ALL,
+
+	__DRM_CMD_MAX,
+	DRM_CMD_MAX = __DRM_CMD_MAX - 1,
+};
+
+enum error_attr {
+	DRM_ATTR_UNSPEC,
+	DRM_ATTR_PAD = DRM_ATTR_UNSPEC,
+	DRM_ATTR_REQUEST, /* NLA_U8 */
+	DRM_ATTR_QUERY_REPLY, /*NLA_NESTED*/
+	DRM_ATTR_ERROR_NAME, /* NLA_NUL_STRING */
+	DRM_ATTR_ERROR_ID, /* NLA_U64 */
+	DRM_ATTR_ERROR_VALUE, /* NLA_U64 */
+
+	__DRM_ATTR_MAX,
+	DRM_ATTR_MAX = __DRM_ATTR_MAX - 1,
+};
+
+/* attribute policies */
+static const struct nla_policy drm_attr_policy_query[DRM_ATTR_MAX + 1] = {
+	[DRM_ATTR_REQUEST] = { .type = NLA_U8 },
+};
+
+static const struct nla_policy drm_attr_policy_read_one[DRM_ATTR_MAX + 1] = {
+	[DRM_ATTR_ERROR_ID] = { .type = NLA_U64 },
+};
+
+#endif
-- 
2.25.1