+ type: u32
+ doc: Node ID of the node that triggered the event.
+ -
+ name: node-name
+ type: string
+ doc: Node name of the node that triggered the event.
+ -
+ name: error-id
+ type: u32
+ doc: Error ID of the counter that triggered the event.
+ -
+ name: error-name
+ type: string
+ doc: Name of the error that triggered the event.
+ -
+ name: error-value
+ type: u32
+ doc: Current value of the error counter.
operations:
list:
@@ -124,3 +153,24 @@ operations:
do:
request:
attributes: *id-attrs
+ -
+ name: error-event
+ doc: >-
+ Notify userspace of an error event.
+ The event includes the device, node and error information
+ of the error that triggered the event.
+ attribute-set: error-event-attrs
+ mcgrp: error-notify
+ event:
+ attributes:
+ - device-name
+ - node-id
+ - node-name
+ - error-id
+ - error-name
+ - error-value
+
+mcast-groups:
+ list:
+ -
+ name: error-notify
diff --git a/drivers/gpu/drm/drm_ras.c b/drivers/gpu/drm/drm_ras.c
index d6eab29a1394..6696ec21782e 100644
--- a/drivers/gpu/drm/drm_ras.c
+++ b/drivers/gpu/drm/drm_ras.c
@@ -41,6 +41,11 @@
* Userspace must provide Node ID, Error ID.
* Clears specific error counter of a node if supported.
*
+ * 4. ERROR_NOTIFY: Subscribe to this multicast group to receive error events
+ *
+ * 5. ERROR_EVENT: Notify userspace of an error event. The event contains
device, node
+ * and error information that triggered the event.
+ *
* Node registration:
*
* - drm_ras_node_register(): Registers a new node and assigns
@@ -186,6 +191,34 @@ static int msg_reply_value(struct sk_buff *msg, u32
error_id,
value);
}
+static int msg_put_error_event_attrs(struct sk_buff *msg, struct drm_ras_node *node,
+ u32 error_id, const char *error_name, u32
value)
+{
+ int ret;
+
+ ret = nla_put_string(msg, DRM_RAS_A_ERROR_EVENT_ATTRS_DEVICE_NAME,
node->device_name);
+ if (ret)
+ return ret;
+
+ ret = nla_put_u32(msg, DRM_RAS_A_ERROR_EVENT_ATTRS_NODE_ID, node->id);
+ if (ret)
+ return ret;
+
+ ret = nla_put_string(msg, DRM_RAS_A_ERROR_EVENT_ATTRS_NODE_NAME,
node->node_name);
+ if (ret)
+ return ret;
+
+ ret = nla_put_u32(msg, DRM_RAS_A_ERROR_EVENT_ATTRS_ERROR_ID, error_id);
+ if (ret)
+ return ret;
+
+ ret = nla_put_string(msg, DRM_RAS_A_ERROR_EVENT_ATTRS_ERROR_NAME,
error_name);
+ if (ret)
+ return ret;
+
+ return nla_put_u32(msg, DRM_RAS_A_ERROR_EVENT_ATTRS_ERROR_VALUE, value);
+}
+
static int doit_reply_value(struct genl_info *info, u32 node_id,
u32 error_id)
{
@@ -222,6 +255,59 @@ static int doit_reply_value(struct genl_info *info, u32
node_id,
return genlmsg_reply(msg, info);
}
+/**
+ * drm_ras_nl_error_event() - Notify listeners of an error event
+ * @node: Node structure
+ * @error_id: ID of the error
+ * @error_name: Name of the error
+ * @value: Value associated with the error
+ * @flags: GFP flags for memory allocation
+ *
+ * Sends a notification to all listeners about an error event on a specific
+ * RAS node.
+ *
+ * Return: 0 on success, or negative errno on failure.
+ */
+int drm_ras_nl_error_event(struct drm_ras_node *node, u32 error_id, const char
*error_name,
+ u32 value, gfp_t flags)
+{
+ struct genl_info info;
+ struct sk_buff *msg;
+ struct nlattr *hdr;
+ int err = -EMSGSIZE;
+ if (!hdr)
+ goto err_free_msg;
+
+ err = msg_put_error_event_attrs(msg, node, error_id, error_name, value);
+ if (err)
+ goto err_cancel;
+
+ genlmsg_end(msg, hdr);
+ genlmsg_multicast(&drm_ras_nl_family, msg, 0,
DRM_RAS_NLGRP_ERROR_NOTIFY, flags);
+ return 0;
+
+err_cancel:
+ genlmsg_cancel(msg, hdr);
+err_free_msg:
+ nlmsg_free(msg);
+ return err;
+}
+EXPORT_SYMBOL(drm_ras_nl_error_event);
+
/**
* drm_ras_nl_get_error_counter_dumpit() - Dump all Error Counters
* @skb: Netlink message buffer
diff --git a/drivers/gpu/drm/drm_ras_nl.c b/drivers/gpu/drm/drm_ras_nl.c
index dea1c1b2494e..ac724bb87a3b 100644
--- a/drivers/gpu/drm/drm_ras_nl.c
+++ b/drivers/gpu/drm/drm_ras_nl.c
@@ -58,6 +58,10 @@ static const struct genl_split_ops drm_ras_nl_ops[] = {
},
};
+static const struct genl_multicast_group drm_ras_nl_mcgrps[] = {
+ [DRM_RAS_NLGRP_ERROR_NOTIFY] = { "error-notify", },
+};
+
struct genl_family drm_ras_nl_family __ro_after_init = {
.name = DRM_RAS_FAMILY_NAME,
.version = DRM_RAS_FAMILY_VERSION,
@@ -66,4 +70,6 @@ struct genl_family drm_ras_nl_family __ro_after_init = {
.module = THIS_MODULE,
.split_ops = drm_ras_nl_ops,
.n_split_ops = ARRAY_SIZE(drm_ras_nl_ops),
+ .mcgrps = drm_ras_nl_mcgrps,
+ .n_mcgrps = ARRAY_SIZE(drm_ras_nl_mcgrps),
};
diff --git a/drivers/gpu/drm/drm_ras_nl.h b/drivers/gpu/drm/drm_ras_nl.h
index a398643572a5..17e1af8cc3b3 100644
--- a/drivers/gpu/drm/drm_ras_nl.h
+++ b/drivers/gpu/drm/drm_ras_nl.h
@@ -21,6 +21,10 @@ int drm_ras_nl_get_error_counter_dumpit(struct sk_buff *skb,
int drm_ras_nl_clear_error_counter_doit(struct sk_buff *skb,
struct genl_info *info);
+enum {
+ DRM_RAS_NLGRP_ERROR_NOTIFY,
+};
+
extern struct genl_family drm_ras_nl_family;
#endif /* _LINUX_DRM_RAS_GEN_H */
diff --git a/include/drm/drm_ras.h b/include/drm/drm_ras.h
index f2a787bc4f64..d4a275efdbb0 100644
--- a/include/drm/drm_ras.h
+++ b/include/drm/drm_ras.h
@@ -78,9 +78,14 @@ struct drm_device;
#if IS_ENABLED(CONFIG_DRM_RAS)
int drm_ras_node_register(struct drm_ras_node *node);
void drm_ras_node_unregister(struct drm_ras_node *node);
+int drm_ras_nl_error_event(struct drm_ras_node *node, u32 error_id, const char
*error_name,
+ u32 value, gfp_t flags);
#else
static inline int drm_ras_node_register(struct drm_ras_node *node) { return
0; }
static inline void drm_ras_node_unregister(struct drm_ras_node *node) { }
+static inline int drm_ras_nl_error_event(struct drm_ras_node *node, u32
error_id,
+ const char *error_name, u32 value,
gfp_t flags)
+{ return 0; }
#endif
#endif
diff --git a/include/uapi/drm/drm_ras.h b/include/uapi/drm/drm_ras.h
index 218a3ee86805..bb2a8a872a44 100644
--- a/include/uapi/drm/drm_ras.h
+++ b/include/uapi/drm/drm_ras.h
@@ -38,13 +38,28 @@ enum {
DRM_RAS_A_ERROR_COUNTER_ATTRS_MAX =
(__DRM_RAS_A_ERROR_COUNTER_ATTRS_MAX - 1)
};
+enum {
+ DRM_RAS_A_ERROR_EVENT_ATTRS_DEVICE_NAME = 1,
+ DRM_RAS_A_ERROR_EVENT_ATTRS_NODE_ID,
+ DRM_RAS_A_ERROR_EVENT_ATTRS_NODE_NAME,
+ DRM_RAS_A_ERROR_EVENT_ATTRS_ERROR_ID,
+ DRM_RAS_A_ERROR_EVENT_ATTRS_ERROR_NAME,
+ DRM_RAS_A_ERROR_EVENT_ATTRS_ERROR_VALUE,
+
+ __DRM_RAS_A_ERROR_EVENT_ATTRS_MAX,
+ DRM_RAS_A_ERROR_EVENT_ATTRS_MAX = (__DRM_RAS_A_ERROR_EVENT_ATTRS_MAX -
1)
+};
+
enum {
DRM_RAS_CMD_LIST_NODES = 1,
DRM_RAS_CMD_GET_ERROR_COUNTER,
DRM_RAS_CMD_CLEAR_ERROR_COUNTER,
+ DRM_RAS_CMD_ERROR_EVENT,
__DRM_RAS_CMD_MAX,
DRM_RAS_CMD_MAX = (__DRM_RAS_CMD_MAX - 1)
};
+#define DRM_RAS_MCGRP_ERROR_NOTIFY "error-notify"
