[Intel-xe] [RFC 4/5] drm/netlink: define multicast groups

[Aravind Iddamsetty <aravind.iddamsetty@intel.com>]

Netlink subsystem supports event notifications to userspace. we define
two multicast groups for correctable and uncorrectable errors to which
userspace can subscribe and be notified when any of those errors happen.
The group names are local to the driver's genl netlink family.

Signed-off-by: Aravind Iddamsetty <aravind.iddamsetty@intel.com>
---
 include/uapi/drm/drm_netlink.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/uapi/drm/drm_netlink.h b/include/uapi/drm/drm_netlink.h
index 28e7a334d0c7..bd3a8b293979 100644
--- a/include/uapi/drm/drm_netlink.h
+++ b/include/uapi/drm/drm_netlink.h
@@ -29,6 +29,8 @@
 #include <net/sock.h>
 
 #define DRM_GENL_VERSION 1
+#define DRM_GENL_MCAST_GROUP_NAME_CORR_ERR	"drm_corr_err"
+#define DRM_GENL_MCAST_GROUP_NAME_UNCORR_ERR	"drm_uncorr_err"
 
 enum error_cmds {
 	DRM_CMD_UNSPEC,
@@ -38,6 +40,7 @@ enum error_cmds {
 	DRM_CMD_READ_ONE,
 	/* command to get counters of all errors */
 	DRM_CMD_READ_ALL,
+	DRM_CMD_ERROR_EVENT,
 
 	__DRM_CMD_MAX,
 	DRM_CMD_MAX = __DRM_CMD_MAX - 1,
@@ -65,4 +68,14 @@ static const struct nla_policy drm_attr_policy_read_one[DRM_ATTR_MAX + 1] = {
 	[DRM_ATTR_ERROR_ID] = { .type = NLA_U64 },
 };
 
+enum mcgrps_events {
+	DRM_GENL_MCAST_CORR_ERR,
+	DRM_GENL_MCAST_UNCORR_ERR,
+};
+
+static const struct genl_multicast_group drm_event_mcgrps[] = {
+	[DRM_GENL_MCAST_CORR_ERR] = { .name = DRM_GENL_MCAST_GROUP_NAME_CORR_ERR, },
+	[DRM_GENL_MCAST_UNCORR_ERR] = { .name = DRM_GENL_MCAST_GROUP_NAME_UNCORR_ERR, },
+};
+
 #endif
-- 
2.25.1