[PATCH v6 0/2] Add drm_ras netlink error event support

[PATCH v6 0/2] Add drm_ras netlink error event support

[Riana Tauro]

Define a new netlink event 'error-event' and a new multicast group
'error-report' in drm-ras. Each event contains device name, node and
error information to identify the error triggering the event.

Add drm_ras_nl_error_event() to trigger an event from the driver.
Wire this support to xe_drm_ras to report to userspace whenever a
correctable/uncorrectable error occurs on CRI.

$ sudo ynl --family drm_ras --output-json --subscribe error-report

{
    "name": "error-event",
     "msg": {
         "device-name": "0000:03:00.0",
         "node-id": 1,
         "node-name": "uncorrectable-errors",
         "error-id": 1,
         "error-name": "core-compute",
         "error-value": 1
     }
}

Rev2: use ynl in document and commit message
      fix cosmetic review comments
      simplify caller

Rev3: replace error-event with error-report
      had has_drm_ras check
      add support for correctable errors in CRI

Rev4: send an event at most once per component for each interrupt
      add xe_warn for unexpected values from firmware
      fix sashiko reported issues

Rev5: Remove has_listeners
      send netlink event to all network namespaces

Rev6: Add additional checks for event
      remove unnecessary checks in xe_ras

Riana Tauro (2):
  drm/drm_ras: Add drm_ras netlink error event
  drm/xe/xe_ras: Report correctable/uncorrectable error events to
    userspace

 Documentation/gpu/drm-ras.rst            |  21 +++++
 Documentation/netlink/specs/drm_ras.yaml |  48 +++++++++++
 drivers/gpu/drm/drm_ras.c                | 101 +++++++++++++++++++++++
 drivers/gpu/drm/drm_ras_nl.c             |   6 ++
 drivers/gpu/drm/drm_ras_nl.h             |   4 +
 drivers/gpu/drm/xe/xe_drm_ras.c          |  31 +++++++
 drivers/gpu/drm/xe/xe_drm_ras.h          |   3 +
 drivers/gpu/drm/xe/xe_ras.c              |  68 +++++++++++++++
 include/drm/drm_ras.h                    |   5 ++
 include/uapi/drm/drm_ras.h               |  15 ++++
 10 files changed, 302 insertions(+)

-- 
2.47.1

[PATCH v6 1/2] drm/drm_ras: Add drm_ras netlink error event

[Riana Tauro]

Define a new netlink event 'error-event' and a new multicast group
'error-report' in drm_ras. Each event contains device name, node and
error information to identify the error triggering the event.

Add drm_ras_nl_error_event() to trigger an event from the driver.
Userspace must subscribe to 'error-report' to receive 'error-event'
notifications.

Usage:

$ sudo ynl --family drm_ras --subscribe error-report

Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Zack McKevitt <zachary.mckevitt@oss.qualcomm.com>
Cc: Lijo Lazar <lijo.lazar@amd.com>
Cc: Hawking Zhang <Hawking.Zhang@amd.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Riana Tauro <riana.tauro@intel.com>
Reviewed-by: Raag Jadav <raag.jadav@intel.com>
---
v2: remove redundant initialization
    remove unnecessary space
    use ynl in commit message and doc (Raag)
    simplify doc for error-event attrs

v3: rename error-notify to error-report
    Replace notify with report across the file (Raag)

v4: send event to all network namespaces (Sashiko)
    remove has_listeners check

v5: add context in function for choosing GFP_KERNEL (Sashiko)
    add additional checks for node registration, range checks (Raag)
---
 Documentation/gpu/drm-ras.rst            |  21 +++++
 Documentation/netlink/specs/drm_ras.yaml |  48 +++++++++++
 drivers/gpu/drm/drm_ras.c                | 101 +++++++++++++++++++++++
 drivers/gpu/drm/drm_ras_nl.c             |   6 ++
 drivers/gpu/drm/drm_ras_nl.h             |   4 +
 include/drm/drm_ras.h                    |   5 ++
 include/uapi/drm/drm_ras.h               |  15 ++++
 7 files changed, 200 insertions(+)

diff --git a/Documentation/gpu/drm-ras.rst b/Documentation/gpu/drm-ras.rst
index 83c21853b74b..406e4c49bac1 100644
--- a/Documentation/gpu/drm-ras.rst
+++ b/Documentation/gpu/drm-ras.rst
@@ -56,6 +56,7 @@ User space tools can:
   ``node-id`` and ``error-id`` as parameters.
 * Clear specific error counters with the ``clear-error-counter`` command, using both
   ``node-id`` and ``error-id`` as parameters.
+* Subscribe to the ``error-report`` multicast group to receive ``error-event``.
 
 YAML-based Interface
 --------------------
@@ -111,3 +112,23 @@ Example: Clear an error counter for a given node
 
     sudo ynl --family drm_ras --do clear-error-counter --json '{"node-id":0, "error-id":1}'
     None
+
+Example: Subscribe to ``error-report`` multicast group
+
+.. code-block:: bash
+
+    sudo ynl --family drm_ras --output-json --subscribe error-report
+
+.. code-block:: json
+
+    {
+        "name": "error-event",
+        "msg": {
+            "device-name": "0000:03:00.0",
+            "node-id": 1,
+            "node-name": "uncorrectable-errors",
+            "error-id": 1,
+            "error-name": "error_name1",
+            "error-value": 1
+        }
+    }
diff --git a/Documentation/netlink/specs/drm_ras.yaml b/Documentation/netlink/specs/drm_ras.yaml
index e113056f8c01..8aed3d4515e5 100644
--- a/Documentation/netlink/specs/drm_ras.yaml
+++ b/Documentation/netlink/specs/drm_ras.yaml
@@ -69,6 +69,33 @@ attribute-sets:
         name: error-value
         type: u32
         doc: Current value of the requested error counter.
+  -
+    name: error-event-attrs
+    attributes:
+      -
+        name: device-name
+        type: string
+        doc: Device (PCI BDF, UUID) that reported the error.
+      -
+        name: node-id
+        type: u32
+        doc: ID of the node that reported the error.
+      -
+        name: node-name
+        type: string
+        doc: Name of the node that reported the error.
+      -
+        name: error-id
+        type: u32
+        doc: ID of the error counter.
+      -
+        name: error-name
+        type: string
+        doc: Name of the error.
+      -
+        name: error-value
+        type: u32
+        doc: Current value of the error counter.
 
 operations:
   list:
@@ -124,3 +151,24 @@ operations:
       do:
         request:
           attributes: *id-attrs
+    -
+      name: error-event
+      doc: >-
+           Report an error event to userspace.
+           The event includes the device, node and error information
+           of the error that triggered the event.
+      attribute-set: error-event-attrs
+      mcgrp: error-report
+      event:
+        attributes:
+          - device-name
+          - node-id
+          - node-name
+          - error-id
+          - error-name
+          - error-value
+
+mcast-groups:
+  list:
+    -
+      name: error-report
diff --git a/drivers/gpu/drm/drm_ras.c b/drivers/gpu/drm/drm_ras.c
index d6eab29a1394..39155fb514de 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_REPORT: Subscribe to this multicast group to receive error events
+ *
+ * 5. ERROR_EVENT: Report an error event to userspace. 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 +255,74 @@ static int doit_reply_value(struct genl_info *info, u32 node_id,
 	return genlmsg_reply(msg, info);
 }
 
+/**
+ * drm_ras_nl_error_event() - Report an error event
+ * @node: Node structure
+ * @error_id: ID of the error
+ * @error_name: Name of the error
+ * @value: Value of the error counter
+ *
+ * Report an error-event to userspace using the error-report multicast group.
+ *
+ * Context: Process context only. Uses %GFP_KERNEL and multicasts to all
+ *          netns, which is unbounded work; callers in interrupt handlers
+ *          or other atomic context must defer event.
+ *
+ * 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)
+{
+	struct genl_info info;
+	struct sk_buff *msg;
+	struct nlattr *hdr;
+	int ret;
+
+	if (!node || !error_name)
+		return -EINVAL;
+
+	/* Check the node is currently registered */
+	if (xa_load(&drm_ras_xa, node->id) != node)
+		return -ENOENT;
+
+	/* Currently only Error Counter events are supported */
+	if (node->type != DRM_RAS_NODE_TYPE_ERROR_COUNTER)
+		return -EOPNOTSUPP;
+
+	/* Check the error ID is within the valid range */
+	if (error_id < node->error_counter_range.first ||
+	    error_id > node->error_counter_range.last)
+		return -EINVAL;
+
+	genl_info_init_ntf(&info, &drm_ras_nl_family, DRM_RAS_CMD_ERROR_EVENT);
+
+	msg = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	hdr = genlmsg_iput(msg, &info);
+	if (!hdr) {
+		ret = -EMSGSIZE;
+		goto free_msg;
+	}
+
+	ret = msg_put_error_event_attrs(msg, node, error_id, error_name, value);
+	if (ret)
+		goto cancel_msg;
+
+	genlmsg_end(msg, hdr);
+	genlmsg_multicast_allns(&drm_ras_nl_family, msg, 0, DRM_RAS_NLGRP_ERROR_REPORT);
+
+	return 0;
+
+cancel_msg:
+	genlmsg_cancel(msg, hdr);
+free_msg:
+	nlmsg_free(msg);
+	return ret;
+}
+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..9d3123cc9f9c 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_REPORT] = { "error-report", },
+};
+
 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..03ec275aca92 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_REPORT,
+};
+
 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 0beede3ddc4e..ee2caa0edc6f 100644
--- a/include/drm/drm_ras.h
+++ b/include/drm/drm_ras.h
@@ -80,9 +80,14 @@ 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);
 #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)
+{ return 0; }
 #endif
 
 #endif
diff --git a/include/uapi/drm/drm_ras.h b/include/uapi/drm/drm_ras.h
index 218a3ee86805..eab8231aa87c 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_REPORT	"error-report"
+
 #endif /* _UAPI_LINUX_DRM_RAS_H */
-- 
2.47.1

[PATCH v6 2/2] drm/xe/xe_ras: Report correctable/uncorrectable error events to userspace

[Riana Tauro]

When an interrupt is received for correctable errors indicating that error
counter has crossed its threshold, read the current counter value and
deliver a drm-ras error-event to userspace for each affected component.

Also send drm-ras error-event to userspace for uncorrectable errors on
receiving an AER.

To avoid sending duplicate events when the same component appears multiple
times in the response, Send the error-event once per component.

Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Riana Tauro <riana.tauro@intel.com>
---
v2: add warns for unexpected values from system controller (Michal)
    send an event at most once per component for each interrupt (Raag)
    use correct parameters for get_counter (Sashiko)

v3: move unsupported logs to drm_ras layer
    use get_counter directly
    use BITS_PER_TYPE
    move the checks before detected log (Raag)

v4: squash both patches
    remove checks (Raag)
---
 drivers/gpu/drm/xe/xe_drm_ras.c | 31 +++++++++++++++
 drivers/gpu/drm/xe/xe_drm_ras.h |  3 ++
 drivers/gpu/drm/xe/xe_ras.c     | 68 +++++++++++++++++++++++++++++++++
 3 files changed, 102 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_drm_ras.c b/drivers/gpu/drm/xe/xe_drm_ras.c
index 7937d8ba0ed9..0998d12464d0 100644
--- a/drivers/gpu/drm/xe/xe_drm_ras.c
+++ b/drivers/gpu/drm/xe/xe_drm_ras.c
@@ -185,6 +185,37 @@ static int register_nodes(struct xe_device *xe)
 	return ret;
 }
 
+/**
+ * xe_drm_ras_event() - Report drm-ras error event to userspace
+ * @xe: xe device structure
+ * @component: error component (see &enum drm_xe_ras_error_component)
+ * @severity: error severity (see &enum drm_xe_ras_error_severity)
+ * @value: value of error counter
+ *
+ * Report an error-event to userspace.
+ */
+void xe_drm_ras_event(struct xe_device *xe, u8 component, u8 severity, u32 value)
+{
+	struct xe_drm_ras *ras = &xe->ras;
+	struct xe_drm_ras_counter *info = ras->info[severity];
+	struct drm_ras_node *node;
+	int ret;
+
+	/* Event is supported only if drm-ras is enabled */
+	if (!xe->info.has_drm_ras)
+		return;
+
+	node = &ras->node[severity];
+
+	if (!info || !info[component].name)
+		return;
+
+	ret = drm_ras_nl_error_event(node, component, info[component].name, value);
+	if (ret)
+		drm_err_ratelimited(&xe->drm, "drm-ras error-event failed: %d for %s %s\n", ret,
+				    info[component].name, error_severity[severity]);
+}
+
 /**
  * xe_drm_ras_init() - Initialize DRM RAS
  * @xe: xe device instance
diff --git a/drivers/gpu/drm/xe/xe_drm_ras.h b/drivers/gpu/drm/xe/xe_drm_ras.h
index 365c70e93e82..add96bf1a7ab 100644
--- a/drivers/gpu/drm/xe/xe_drm_ras.h
+++ b/drivers/gpu/drm/xe/xe_drm_ras.h
@@ -5,11 +5,14 @@
 #ifndef _XE_DRM_RAS_H_
 #define _XE_DRM_RAS_H_
 
+#include <linux/types.h>
+
 struct xe_device;
 
 #define for_each_error_severity(i)	\
 	for (i = 0; i < DRM_XE_RAS_ERR_SEV_MAX; i++)
 
 int xe_drm_ras_init(struct xe_device *xe);
+void xe_drm_ras_event(struct xe_device *xe, u8 component, u8 severity, u32 value);
 
 #endif
diff --git a/drivers/gpu/drm/xe/xe_ras.c b/drivers/gpu/drm/xe/xe_ras.c
index a31e06b8aa67..d43f614de723 100644
--- a/drivers/gpu/drm/xe/xe_ras.c
+++ b/drivers/gpu/drm/xe/xe_ras.c
@@ -90,6 +90,8 @@ static const char * const gpu_health_states[] = {
 };
 static_assert(ARRAY_SIZE(gpu_health_states) == XE_RAS_HEALTH_MAX);
 
+static int get_counter(struct xe_device *xe, struct xe_ras_error_class *counter, u32 *value);
+
 static u8 drm_to_xe_ras_severity(u8 severity)
 {
 	switch (severity) {
@@ -102,6 +104,18 @@ static u8 drm_to_xe_ras_severity(u8 severity)
 	}
 }
 
+static u8 xe_to_drm_ras_severity(u8 severity)
+{
+	switch (severity) {
+	case XE_RAS_SEV_CORRECTABLE:
+		return DRM_XE_RAS_ERR_SEV_CORRECTABLE;
+	case XE_RAS_SEV_UNCORRECTABLE:
+		return DRM_XE_RAS_ERR_SEV_UNCORRECTABLE;
+	default:
+		return DRM_XE_RAS_ERR_SEV_MAX;
+	}
+}
+
 static u8 drm_to_xe_ras_component(u8 component)
 {
 	switch (component) {
@@ -120,6 +134,24 @@ static u8 drm_to_xe_ras_component(u8 component)
 	}
 }
 
+static u8 xe_to_drm_ras_component(u8 component)
+{
+	switch (component) {
+	case XE_RAS_COMP_DEVICE_MEMORY:
+		return DRM_XE_RAS_ERR_COMP_DEVICE_MEMORY;
+	case XE_RAS_COMP_CORE_COMPUTE:
+		return DRM_XE_RAS_ERR_COMP_CORE_COMPUTE;
+	case XE_RAS_COMP_PCIE:
+		return DRM_XE_RAS_ERR_COMP_PCIE;
+	case XE_RAS_COMP_FABRIC:
+		return DRM_XE_RAS_ERR_COMP_FABRIC;
+	case XE_RAS_COMP_SOC_INTERNAL:
+		return DRM_XE_RAS_ERR_COMP_SOC_INTERNAL;
+	default:
+		return DRM_XE_RAS_ERR_COMP_MAX;
+	}
+}
+
 static int ras_status_to_errno(u32 status)
 {
 	switch (status) {
@@ -218,6 +250,26 @@ static void ras_usp_aer_init(struct xe_device *xe)
 	dev_dbg(&usp->dev, "Uncorrectable Internal Errors downgraded and unmasked\n");
 }
 
+static void ras_send_error_event(struct xe_device *xe, u8 severity, u8 component)
+{
+	struct xe_ras_error_class counter = {0};
+	u8 drm_severity, drm_component;
+	u32 value;
+	int ret;
+
+	counter.common.severity = severity;
+	counter.common.component = component;
+
+	ret = get_counter(xe, &counter, &value);
+	if (ret)
+		return;
+
+	drm_severity = xe_to_drm_ras_severity(severity);
+	drm_component = xe_to_drm_ras_component(component);
+
+	xe_drm_ras_event(xe, drm_component, drm_severity, value);
+}
+
 static u8 handle_core_compute_errors(struct xe_ras_error_array *arr)
 {
 	struct xe_ras_compute_error *error_info = (void *)arr->details;
@@ -312,8 +364,10 @@ void xe_ras_counter_threshold_crossed(struct xe_device *xe,
 	struct xe_ras_threshold_crossed *pending = (void *)&response->data;
 	struct xe_ras_error_class *errors = pending->counters;
 	u32 id, ncounters = pending->ncounters;
+	u8 sent = 0;
 
 	BUILD_BUG_ON(sizeof(response->data) < sizeof(*pending));
+	BUILD_BUG_ON(BITS_PER_TYPE(sent) < XE_RAS_COMP_MAX);
 	xe_device_assert_mem_access(xe);
 
 	if (!ncounters || ncounters > XE_RAS_NUM_COUNTERS)
@@ -329,6 +383,13 @@ void xe_ras_counter_threshold_crossed(struct xe_device *xe,
 
 		xe_warn(xe, "[RAS]: %s %s detected\n",
 			comp_to_str(component), sev_to_str(severity));
+
+		/* Send event once per component */
+		if (sent & BIT(component))
+			continue;
+		sent |= BIT(component);
+
+		ras_send_error_event(xe, severity, component);
 	}
 }
 
@@ -382,6 +443,7 @@ enum xe_ras_recovery_action xe_ras_process_errors(struct xe_device *xe)
 	enum xe_ras_recovery_action final_action;
 	u32 remaining = XE_SYSCTRL_FLOOD_LIMIT;
 	struct xe_ras_get_soc_error response;
+	u8 sent = 0;
 	size_t rlen;
 	int ret;
 
@@ -425,6 +487,12 @@ enum xe_ras_recovery_action xe_ras_process_errors(struct xe_device *xe)
 			xe_info(xe, "[RAS]: %s %s detected\n", comp_to_str(component),
 				sev_to_str(severity));
 
+			/* Send event once per component */
+			if (!(sent & BIT(component))) {
+				sent |= BIT(component);
+				ras_send_error_event(xe, severity, component);
+			}
+
 			switch (component) {
 			case XE_RAS_COMP_CORE_COMPUTE:
 				action = handle_core_compute_errors(arr);
-- 
2.47.1

Re: [PATCH v6 2/2] drm/xe/xe_ras: Report correctable/uncorrectable error events to userspace

[Raag Jadav]

On Wed, Jul 22, 2026 at 03:11:37PM +0530, Riana Tauro wrote:
> When an interrupt is received for correctable errors indicating that error
> counter has crossed its threshold, read the current counter value and
> deliver a drm-ras error-event to userspace for each affected component.
> 
> Also send drm-ras error-event to userspace for uncorrectable errors on
> receiving an AER.
> 
> To avoid sending duplicate events when the same component appears multiple
> times in the response, Send the error-event once per component.

...

> @@ -425,6 +487,12 @@ enum xe_ras_recovery_action xe_ras_process_errors(struct xe_device *xe)
>  			xe_info(xe, "[RAS]: %s %s detected\n", comp_to_str(component),
>  				sev_to_str(severity));

Similar to threshold crossed case, we should probably have a BUILD_BUG_ON()
against XE_RAS_NUM_ERROR_ARR.

Reviewed-by: Raag Jadav <raag.jadav@intel.com>

> +			/* Send event once per component */
> +			if (!(sent & BIT(component))) {
> +				sent |= BIT(component);
> +				ras_send_error_event(xe, severity, component);
> +			}
> +
>  			switch (component) {
>  			case XE_RAS_COMP_CORE_COMPUTE:
>  				action = handle_core_compute_errors(arr);
> -- 
> 2.47.1
> 

Re: [PATCH v6 2/2] drm/xe/xe_ras: Report correctable/uncorrectable error events to userspace

[Raag Jadav]

On Wed, Jul 22, 2026 at 05:24:11PM +0200, Raag Jadav wrote:
> On Wed, Jul 22, 2026 at 03:11:37PM +0530, Riana Tauro wrote:
> > When an interrupt is received for correctable errors indicating that error
> > counter has crossed its threshold, read the current counter value and
> > deliver a drm-ras error-event to userspace for each affected component.
> > 
> > Also send drm-ras error-event to userspace for uncorrectable errors on
> > receiving an AER.
> > 
> > To avoid sending duplicate events when the same component appears multiple
> > times in the response, Send the error-event once per component.
> 
> ...
> 
> > @@ -425,6 +487,12 @@ enum xe_ras_recovery_action xe_ras_process_errors(struct xe_device *xe)
> >  			xe_info(xe, "[RAS]: %s %s detected\n", comp_to_str(component),
> >  				sev_to_str(severity));
> 
> Similar to threshold crossed case, we should probably have a BUILD_BUG_ON()
> against XE_RAS_NUM_ERROR_ARR.

XE_RAS_COMP_MAX, missed it :)

> Reviewed-by: Raag Jadav <raag.jadav@intel.com>
> 
> > +			/* Send event once per component */
> > +			if (!(sent & BIT(component))) {
> > +				sent |= BIT(component);
> > +				ras_send_error_event(xe, severity, component);
> > +			}
> > +
> >  			switch (component) {
> >  			case XE_RAS_COMP_CORE_COMPUTE:
> >  				action = handle_core_compute_errors(arr);
> > -- 
> > 2.47.1
> > 

Re: [PATCH v6 2/2] drm/xe/xe_ras: Report correctable/uncorrectable error events to userspace

[Raag Jadav]

On Wed, Jul 22, 2026 at 03:11:37PM +0530, Riana Tauro wrote:
> When an interrupt is received for correctable errors indicating that error
> counter has crossed its threshold, read the current counter value and
> deliver a drm-ras error-event to userspace for each affected component.
> 
> Also send drm-ras error-event to userspace for uncorrectable errors on
> receiving an AER.
> 
> To avoid sending duplicate events when the same component appears multiple
> times in the response, Send the error-event once per component.

...

> +/**
> + * xe_drm_ras_event() - Report drm-ras error event to userspace
> + * @xe: xe device structure
> + * @component: error component (see &enum drm_xe_ras_error_component)
> + * @severity: error severity (see &enum drm_xe_ras_error_severity)
> + * @value: value of error counter
> + *
> + * Report an error-event to userspace.
> + */
> +void xe_drm_ras_event(struct xe_device *xe, u8 component, u8 severity, u32 value)

Forgot to add. Looking at the existing xe_drm_ras code, this should be

void xe_drm_ras_event(struct xe_device *xe, enum drm_xe_ras_error_severity severity,
		      u32 error_id, u32 val)

but can be done as follow up.

Raag

Re: [PATCH v6 1/2] drm/drm_ras: Add drm_ras netlink error event

[Tauro, Riana]

@Rodrigo The sashiko comments are resolved and has been tested with 
multiple namespaces using docker.
Sashiko review is now clear with a pre-existing issue that is being 
fixed in another patch
[PATCH v5 1/5] drm/ras: Cancel and free message on get counter failure - 
Raag Jadav

<https://lore.kernel.org/intel-xe/20260722034228.662746-2-raag.jadav@intel.com/>Let 
me know if this looks good

Thanks
Riana

On 22-07-2026 15:11, Riana Tauro wrote:
> Define a new netlink event 'error-event' and a new multicast group
> 'error-report' in drm_ras. Each event contains device name, node and
> error information to identify the error triggering the event.
>
> Add drm_ras_nl_error_event() to trigger an event from the driver.
> Userspace must subscribe to 'error-report' to receive 'error-event'
> notifications.
>
> Usage:
>
> $ sudo ynl --family drm_ras --subscribe error-report
>
> Cc: Jakub Kicinski <kuba@kernel.org>
> Cc: Zack McKevitt <zachary.mckevitt@oss.qualcomm.com>
> Cc: Lijo Lazar <lijo.lazar@amd.com>
> Cc: Hawking Zhang <Hawking.Zhang@amd.com>
> Cc: David S. Miller <davem@davemloft.net>
> Cc: Paolo Abeni <pabeni@redhat.com>
> Cc: Eric Dumazet <edumazet@google.com>
> Signed-off-by: Riana Tauro <riana.tauro@intel.com>
> Reviewed-by: Raag Jadav <raag.jadav@intel.com>
> ---
> v2: remove redundant initialization
>      remove unnecessary space
>      use ynl in commit message and doc (Raag)
>      simplify doc for error-event attrs
>
> v3: rename error-notify to error-report
>      Replace notify with report across the file (Raag)
>
> v4: send event to all network namespaces (Sashiko)
>      remove has_listeners check
>
> v5: add context in function for choosing GFP_KERNEL (Sashiko)
>      add additional checks for node registration, range checks (Raag)
> ---
>   Documentation/gpu/drm-ras.rst            |  21 +++++
>   Documentation/netlink/specs/drm_ras.yaml |  48 +++++++++++
>   drivers/gpu/drm/drm_ras.c                | 101 +++++++++++++++++++++++
>   drivers/gpu/drm/drm_ras_nl.c             |   6 ++
>   drivers/gpu/drm/drm_ras_nl.h             |   4 +
>   include/drm/drm_ras.h                    |   5 ++
>   include/uapi/drm/drm_ras.h               |  15 ++++
>   7 files changed, 200 insertions(+)
>
> diff --git a/Documentation/gpu/drm-ras.rst b/Documentation/gpu/drm-ras.rst
> index 83c21853b74b..406e4c49bac1 100644
> --- a/Documentation/gpu/drm-ras.rst
> +++ b/Documentation/gpu/drm-ras.rst
> @@ -56,6 +56,7 @@ User space tools can:
>     ``node-id`` and ``error-id`` as parameters.
>   * Clear specific error counters with the ``clear-error-counter`` command, using both
>     ``node-id`` and ``error-id`` as parameters.
> +* Subscribe to the ``error-report`` multicast group to receive ``error-event``.
>   
>   YAML-based Interface
>   --------------------
> @@ -111,3 +112,23 @@ Example: Clear an error counter for a given node
>   
>       sudo ynl --family drm_ras --do clear-error-counter --json '{"node-id":0, "error-id":1}'
>       None
> +
> +Example: Subscribe to ``error-report`` multicast group
> +
> +.. code-block:: bash
> +
> +    sudo ynl --family drm_ras --output-json --subscribe error-report
> +
> +.. code-block:: json
> +
> +    {
> +        "name": "error-event",
> +        "msg": {
> +            "device-name": "0000:03:00.0",
> +            "node-id": 1,
> +            "node-name": "uncorrectable-errors",
> +            "error-id": 1,
> +            "error-name": "error_name1",
> +            "error-value": 1
> +        }
> +    }
> diff --git a/Documentation/netlink/specs/drm_ras.yaml b/Documentation/netlink/specs/drm_ras.yaml
> index e113056f8c01..8aed3d4515e5 100644
> --- a/Documentation/netlink/specs/drm_ras.yaml
> +++ b/Documentation/netlink/specs/drm_ras.yaml
> @@ -69,6 +69,33 @@ attribute-sets:
>           name: error-value
>           type: u32
>           doc: Current value of the requested error counter.
> +  -
> +    name: error-event-attrs
> +    attributes:
> +      -
> +        name: device-name
> +        type: string
> +        doc: Device (PCI BDF, UUID) that reported the error.
> +      -
> +        name: node-id
> +        type: u32
> +        doc: ID of the node that reported the error.
> +      -
> +        name: node-name
> +        type: string
> +        doc: Name of the node that reported the error.
> +      -
> +        name: error-id
> +        type: u32
> +        doc: ID of the error counter.
> +      -
> +        name: error-name
> +        type: string
> +        doc: Name of the error.
> +      -
> +        name: error-value
> +        type: u32
> +        doc: Current value of the error counter.
>   
>   operations:
>     list:
> @@ -124,3 +151,24 @@ operations:
>         do:
>           request:
>             attributes: *id-attrs
> +    -
> +      name: error-event
> +      doc: >-
> +           Report an error event to userspace.
> +           The event includes the device, node and error information
> +           of the error that triggered the event.
> +      attribute-set: error-event-attrs
> +      mcgrp: error-report
> +      event:
> +        attributes:
> +          - device-name
> +          - node-id
> +          - node-name
> +          - error-id
> +          - error-name
> +          - error-value
> +
> +mcast-groups:
> +  list:
> +    -
> +      name: error-report
> diff --git a/drivers/gpu/drm/drm_ras.c b/drivers/gpu/drm/drm_ras.c
> index d6eab29a1394..39155fb514de 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_REPORT: Subscribe to this multicast group to receive error events
> + *
> + * 5. ERROR_EVENT: Report an error event to userspace. 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 +255,74 @@ static int doit_reply_value(struct genl_info *info, u32 node_id,
>   	return genlmsg_reply(msg, info);
>   }
>   
> +/**
> + * drm_ras_nl_error_event() - Report an error event
> + * @node: Node structure
> + * @error_id: ID of the error
> + * @error_name: Name of the error
> + * @value: Value of the error counter
> + *
> + * Report an error-event to userspace using the error-report multicast group.
> + *
> + * Context: Process context only. Uses %GFP_KERNEL and multicasts to all
> + *          netns, which is unbounded work; callers in interrupt handlers
> + *          or other atomic context must defer event.
> + *
> + * 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)
> +{
> +	struct genl_info info;
> +	struct sk_buff *msg;
> +	struct nlattr *hdr;
> +	int ret;
> +
> +	if (!node || !error_name)
> +		return -EINVAL;
> +
> +	/* Check the node is currently registered */
> +	if (xa_load(&drm_ras_xa, node->id) != node)
> +		return -ENOENT;
> +
> +	/* Currently only Error Counter events are supported */
> +	if (node->type != DRM_RAS_NODE_TYPE_ERROR_COUNTER)
> +		return -EOPNOTSUPP;
> +
> +	/* Check the error ID is within the valid range */
> +	if (error_id < node->error_counter_range.first ||
> +	    error_id > node->error_counter_range.last)
> +		return -EINVAL;
> +
> +	genl_info_init_ntf(&info, &drm_ras_nl_family, DRM_RAS_CMD_ERROR_EVENT);
> +
> +	msg = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
> +	if (!msg)
> +		return -ENOMEM;
> +
> +	hdr = genlmsg_iput(msg, &info);
> +	if (!hdr) {
> +		ret = -EMSGSIZE;
> +		goto free_msg;
> +	}
> +
> +	ret = msg_put_error_event_attrs(msg, node, error_id, error_name, value);
> +	if (ret)
> +		goto cancel_msg;
> +
> +	genlmsg_end(msg, hdr);
> +	genlmsg_multicast_allns(&drm_ras_nl_family, msg, 0, DRM_RAS_NLGRP_ERROR_REPORT);
> +
> +	return 0;
> +
> +cancel_msg:
> +	genlmsg_cancel(msg, hdr);
> +free_msg:
> +	nlmsg_free(msg);
> +	return ret;
> +}
> +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..9d3123cc9f9c 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_REPORT] = { "error-report", },
> +};
> +
>   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..03ec275aca92 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_REPORT,
> +};
> +
>   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 0beede3ddc4e..ee2caa0edc6f 100644
> --- a/include/drm/drm_ras.h
> +++ b/include/drm/drm_ras.h
> @@ -80,9 +80,14 @@ 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);
>   #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)
> +{ return 0; }
>   #endif
>   
>   #endif
> diff --git a/include/uapi/drm/drm_ras.h b/include/uapi/drm/drm_ras.h
> index 218a3ee86805..eab8231aa87c 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_REPORT	"error-report"
> +
>   #endif /* _UAPI_LINUX_DRM_RAS_H */

Re: [PATCH v6 2/2] drm/xe/xe_ras: Report correctable/uncorrectable error events to userspace

[Tauro, Riana]

On 22-07-2026 20:54, Raag Jadav wrote:
> On Wed, Jul 22, 2026 at 03:11:37PM +0530, Riana Tauro wrote:
>> When an interrupt is received for correctable errors indicating that error
>> counter has crossed its threshold, read the current counter value and
>> deliver a drm-ras error-event to userspace for each affected component.
>>
>> Also send drm-ras error-event to userspace for uncorrectable errors on
>> receiving an AER.
>>
>> To avoid sending duplicate events when the same component appears multiple
>> times in the response, Send the error-event once per component.
> ...
>
>> @@ -425,6 +487,12 @@ enum xe_ras_recovery_action xe_ras_process_errors(struct xe_device *xe)
>>   			xe_info(xe, "[RAS]: %s %s detected\n", comp_to_str(component),
>>   				sev_to_str(severity));
> Similar to threshold crossed case, we should probably have a BUILD_BUG_ON()
> against XE_RAS_NUM_ERROR_ARR.

This is already added part of correctable. Seems unnecessary to add it twice

>
> Reviewed-by: Raag Jadav <raag.jadav@intel.com>

Thank you for the review.

>
>> +			/* Send event once per component */
>> +			if (!(sent & BIT(component))) {
>> +				sent |= BIT(component);
>> +				ras_send_error_event(xe, severity, component);
>> +			}
>> +
>>   			switch (component) {
>>   			case XE_RAS_COMP_CORE_COMPUTE:
>>   				action = handle_core_compute_errors(arr);
>> -- 
>> 2.47.1
>>

Re: [PATCH v6 2/2] drm/xe/xe_ras: Report correctable/uncorrectable error events to userspace

[Raag Jadav]

On Thu, Jul 23, 2026 at 08:34:39PM +0530, Tauro, Riana wrote:
> On 22-07-2026 20:54, Raag Jadav wrote:
> > On Wed, Jul 22, 2026 at 03:11:37PM +0530, Riana Tauro wrote:
> > > When an interrupt is received for correctable errors indicating that error
> > > counter has crossed its threshold, read the current counter value and
> > > deliver a drm-ras error-event to userspace for each affected component.
> > > 
> > > Also send drm-ras error-event to userspace for uncorrectable errors on
> > > receiving an AER.
> > > 
> > > To avoid sending duplicate events when the same component appears multiple
> > > times in the response, Send the error-event once per component.
> > ...
> > 
> > > @@ -425,6 +487,12 @@ enum xe_ras_recovery_action xe_ras_process_errors(struct xe_device *xe)
> > >   			xe_info(xe, "[RAS]: %s %s detected\n", comp_to_str(component),
> > >   				sev_to_str(severity));
> > Similar to threshold crossed case, we should probably have a BUILD_BUG_ON()
> > against XE_RAS_NUM_ERROR_ARR.
> 
> This is already added part of correctable. Seems unnecessary to add it twice

'sent' is a local variable and needs its own BUILD_BUG_ON() IMO, but
upto you.

Raag

Re: [PATCH v6 1/2] drm/drm_ras: Add drm_ras netlink error event

[Rodrigo Vivi]

On Thu, Jul 23, 2026 at 08:06:22PM +0530, Tauro, Riana wrote:
> 
> @Rodrigo The sashiko comments are resolved and has been tested with multiple
> namespaces using docker.
> Sashiko review is now clear with a pre-existing issue that is being fixed in
> another patch
> [PATCH v5 1/5] drm/ras: Cancel and free message on get counter failure -
> Raag Jadav
> 
> <https://lore.kernel.org/intel-xe/20260722034228.662746-2-raag.jadav@intel.com/>Let
> me know if this looks good

Yeap, this is okay. On this one I just had the feeling that Raag had changed
his mind and asked further changes after the put the rv-b.

Perhaps we should resend a clean history and then we use that to ask
for the appropriate acks

> 
> Thanks
> Riana
> 
> On 22-07-2026 15:11, Riana Tauro wrote:
> > Define a new netlink event 'error-event' and a new multicast group
> > 'error-report' in drm_ras. Each event contains device name, node and
> > error information to identify the error triggering the event.
> > 
> > Add drm_ras_nl_error_event() to trigger an event from the driver.
> > Userspace must subscribe to 'error-report' to receive 'error-event'
> > notifications.
> > 
> > Usage:
> > 
> > $ sudo ynl --family drm_ras --subscribe error-report
> > 
> > Cc: Jakub Kicinski <kuba@kernel.org>
> > Cc: Zack McKevitt <zachary.mckevitt@oss.qualcomm.com>
> > Cc: Lijo Lazar <lijo.lazar@amd.com>
> > Cc: Hawking Zhang <Hawking.Zhang@amd.com>
> > Cc: David S. Miller <davem@davemloft.net>
> > Cc: Paolo Abeni <pabeni@redhat.com>
> > Cc: Eric Dumazet <edumazet@google.com>
> > Signed-off-by: Riana Tauro <riana.tauro@intel.com>
> > Reviewed-by: Raag Jadav <raag.jadav@intel.com>
> > ---
> > v2: remove redundant initialization
> >      remove unnecessary space
> >      use ynl in commit message and doc (Raag)
> >      simplify doc for error-event attrs
> > 
> > v3: rename error-notify to error-report
> >      Replace notify with report across the file (Raag)
> > 
> > v4: send event to all network namespaces (Sashiko)
> >      remove has_listeners check
> > 
> > v5: add context in function for choosing GFP_KERNEL (Sashiko)
> >      add additional checks for node registration, range checks (Raag)
> > ---
> >   Documentation/gpu/drm-ras.rst            |  21 +++++
> >   Documentation/netlink/specs/drm_ras.yaml |  48 +++++++++++
> >   drivers/gpu/drm/drm_ras.c                | 101 +++++++++++++++++++++++
> >   drivers/gpu/drm/drm_ras_nl.c             |   6 ++
> >   drivers/gpu/drm/drm_ras_nl.h             |   4 +
> >   include/drm/drm_ras.h                    |   5 ++
> >   include/uapi/drm/drm_ras.h               |  15 ++++
> >   7 files changed, 200 insertions(+)
> > 
> > diff --git a/Documentation/gpu/drm-ras.rst b/Documentation/gpu/drm-ras.rst
> > index 83c21853b74b..406e4c49bac1 100644
> > --- a/Documentation/gpu/drm-ras.rst
> > +++ b/Documentation/gpu/drm-ras.rst
> > @@ -56,6 +56,7 @@ User space tools can:
> >     ``node-id`` and ``error-id`` as parameters.
> >   * Clear specific error counters with the ``clear-error-counter`` command, using both
> >     ``node-id`` and ``error-id`` as parameters.
> > +* Subscribe to the ``error-report`` multicast group to receive ``error-event``.
> >   YAML-based Interface
> >   --------------------
> > @@ -111,3 +112,23 @@ Example: Clear an error counter for a given node
> >       sudo ynl --family drm_ras --do clear-error-counter --json '{"node-id":0, "error-id":1}'
> >       None
> > +
> > +Example: Subscribe to ``error-report`` multicast group
> > +
> > +.. code-block:: bash
> > +
> > +    sudo ynl --family drm_ras --output-json --subscribe error-report
> > +
> > +.. code-block:: json
> > +
> > +    {
> > +        "name": "error-event",
> > +        "msg": {
> > +            "device-name": "0000:03:00.0",
> > +            "node-id": 1,
> > +            "node-name": "uncorrectable-errors",
> > +            "error-id": 1,
> > +            "error-name": "error_name1",
> > +            "error-value": 1
> > +        }
> > +    }
> > diff --git a/Documentation/netlink/specs/drm_ras.yaml b/Documentation/netlink/specs/drm_ras.yaml
> > index e113056f8c01..8aed3d4515e5 100644
> > --- a/Documentation/netlink/specs/drm_ras.yaml
> > +++ b/Documentation/netlink/specs/drm_ras.yaml
> > @@ -69,6 +69,33 @@ attribute-sets:
> >           name: error-value
> >           type: u32
> >           doc: Current value of the requested error counter.
> > +  -
> > +    name: error-event-attrs
> > +    attributes:
> > +      -
> > +        name: device-name
> > +        type: string
> > +        doc: Device (PCI BDF, UUID) that reported the error.
> > +      -
> > +        name: node-id
> > +        type: u32
> > +        doc: ID of the node that reported the error.
> > +      -
> > +        name: node-name
> > +        type: string
> > +        doc: Name of the node that reported the error.
> > +      -
> > +        name: error-id
> > +        type: u32
> > +        doc: ID of the error counter.
> > +      -
> > +        name: error-name
> > +        type: string
> > +        doc: Name of the error.
> > +      -
> > +        name: error-value
> > +        type: u32
> > +        doc: Current value of the error counter.
> >   operations:
> >     list:
> > @@ -124,3 +151,24 @@ operations:
> >         do:
> >           request:
> >             attributes: *id-attrs
> > +    -
> > +      name: error-event
> > +      doc: >-
> > +           Report an error event to userspace.
> > +           The event includes the device, node and error information
> > +           of the error that triggered the event.
> > +      attribute-set: error-event-attrs
> > +      mcgrp: error-report
> > +      event:
> > +        attributes:
> > +          - device-name
> > +          - node-id
> > +          - node-name
> > +          - error-id
> > +          - error-name
> > +          - error-value
> > +
> > +mcast-groups:
> > +  list:
> > +    -
> > +      name: error-report
> > diff --git a/drivers/gpu/drm/drm_ras.c b/drivers/gpu/drm/drm_ras.c
> > index d6eab29a1394..39155fb514de 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_REPORT: Subscribe to this multicast group to receive error events
> > + *
> > + * 5. ERROR_EVENT: Report an error event to userspace. 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 +255,74 @@ static int doit_reply_value(struct genl_info *info, u32 node_id,
> >   	return genlmsg_reply(msg, info);
> >   }
> > +/**
> > + * drm_ras_nl_error_event() - Report an error event
> > + * @node: Node structure
> > + * @error_id: ID of the error
> > + * @error_name: Name of the error
> > + * @value: Value of the error counter
> > + *
> > + * Report an error-event to userspace using the error-report multicast group.
> > + *
> > + * Context: Process context only. Uses %GFP_KERNEL and multicasts to all
> > + *          netns, which is unbounded work; callers in interrupt handlers
> > + *          or other atomic context must defer event.
> > + *
> > + * 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)
> > +{
> > +	struct genl_info info;
> > +	struct sk_buff *msg;
> > +	struct nlattr *hdr;
> > +	int ret;
> > +
> > +	if (!node || !error_name)
> > +		return -EINVAL;
> > +
> > +	/* Check the node is currently registered */
> > +	if (xa_load(&drm_ras_xa, node->id) != node)
> > +		return -ENOENT;
> > +
> > +	/* Currently only Error Counter events are supported */
> > +	if (node->type != DRM_RAS_NODE_TYPE_ERROR_COUNTER)
> > +		return -EOPNOTSUPP;
> > +
> > +	/* Check the error ID is within the valid range */
> > +	if (error_id < node->error_counter_range.first ||
> > +	    error_id > node->error_counter_range.last)
> > +		return -EINVAL;
> > +
> > +	genl_info_init_ntf(&info, &drm_ras_nl_family, DRM_RAS_CMD_ERROR_EVENT);
> > +
> > +	msg = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
> > +	if (!msg)
> > +		return -ENOMEM;
> > +
> > +	hdr = genlmsg_iput(msg, &info);
> > +	if (!hdr) {
> > +		ret = -EMSGSIZE;
> > +		goto free_msg;
> > +	}
> > +
> > +	ret = msg_put_error_event_attrs(msg, node, error_id, error_name, value);
> > +	if (ret)
> > +		goto cancel_msg;
> > +
> > +	genlmsg_end(msg, hdr);
> > +	genlmsg_multicast_allns(&drm_ras_nl_family, msg, 0, DRM_RAS_NLGRP_ERROR_REPORT);
> > +
> > +	return 0;
> > +
> > +cancel_msg:
> > +	genlmsg_cancel(msg, hdr);
> > +free_msg:
> > +	nlmsg_free(msg);
> > +	return ret;
> > +}
> > +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..9d3123cc9f9c 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_REPORT] = { "error-report", },
> > +};
> > +
> >   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..03ec275aca92 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_REPORT,
> > +};
> > +
> >   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 0beede3ddc4e..ee2caa0edc6f 100644
> > --- a/include/drm/drm_ras.h
> > +++ b/include/drm/drm_ras.h
> > @@ -80,9 +80,14 @@ 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);
> >   #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)
> > +{ return 0; }
> >   #endif
> >   #endif
> > diff --git a/include/uapi/drm/drm_ras.h b/include/uapi/drm/drm_ras.h
> > index 218a3ee86805..eab8231aa87c 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_REPORT	"error-report"
> > +
> >   #endif /* _UAPI_LINUX_DRM_RAS_H */