[PATCH v2 1/2] drm/drm_ras: Add clear-error-counter netlink command to drm_ras

Riana Tauro
2026-04-09T07:01:20Z

Introduce a new 'clear-error-counter' drm_ras command to reset the counter
value for a specific error counter of a given node.

The command is a 'do' netlink request with 'node-id' and 'error-id'
as parameters with no response payload.

Usage:

$ sudo ynl --family drm_ras --do clear-error-counter --json \
'{"node-id":1, "error-id":1}'
None

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: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Raag Jadav <raag.jadav@intel.com>
---
Documentation/gpu/drm-ras.rst | 8 +++++
Documentation/netlink/specs/drm_ras.yaml | 13 ++++++-
drivers/gpu/drm/drm_ras.c | 43 +++++++++++++++++++++++-
drivers/gpu/drm/drm_ras_nl.c | 13 +++++++
drivers/gpu/drm/drm_ras_nl.h | 2 ++
include/drm/drm_ras.h | 11 ++++++
include/uapi/drm/drm_ras.h | 1 +
7 files changed, 89 insertions(+), 2 deletions(-)

diff --git a/Documentation/gpu/drm-ras.rst b/Documentation/gpu/drm-ras.rst
index 70b246a78fc8..4636e68f5678 100644
--- a/Documentation/gpu/drm-ras.rst
+++ b/Documentation/gpu/drm-ras.rst
@@ -52,6 +52,8 @@ User space tools can:
as a parameter.
* Query specific error counter values with the ``get-error-counter`` command, using both
``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.

YAML-based Interface
--------------------
@@ -101,3 +103,9 @@ Example: Query an error counter for a given node
sudo ynl --family drm_ras --do get-error-counter --json '{"node-id":0, "error-id":1}'
{'error-id': 1, 'error-name': 'error_name1', 'error-value': 0}

+Example: Clear an error counter for a given node
+
+.. code-block:: bash
+
+ sudo ynl --family drm_ras --do clear-error-counter --json '{"node-id":0, "error-id":1}'
+ None
diff --git a/Documentation/netlink/specs/drm_ras.yaml b/Documentation/netlink/specs/drm_ras.yaml
index 79af25dac3c5..e113056f8c01 100644
--- a/Documentation/netlink/specs/drm_ras.yaml
+++ b/Documentation/netlink/specs/drm_ras.yaml
@@ -99,7 +99,7 @@ operations:
flags: [admin-perm]
do:
request:
- attributes:
+ attributes: &id-attrs
- node-id
- error-id
reply:
@@ -113,3 +113,14 @@ operations:
- node-id
reply:
attributes: *errorinfo
+ -
+ name: clear-error-counter
+ doc: >-
+ Clear error counter for a given node.
+ The request includes the error-id and node-id of the
+ counter to be cleared.
+ attribute-set: error-counter-attrs
+ flags: [admin-perm]
+ do:
+ request:
+ attributes: *id-attrs
diff --git a/drivers/gpu/drm/drm_ras.c b/drivers/gpu/drm/drm_ras.c
index b2fa5ab86d87..d6eab29a1394 100644
--- a/drivers/gpu/drm/drm_ras.c
+++ b/drivers/gpu/drm/drm_ras.c
@@ -26,7 +26,7 @@
* efficient lookup by ID. Nodes can be registered or unregistered
* dynamically at runtime.
*
- * A Generic Netlink family `drm_ras` exposes two main operations to
+ * A Generic Netlink family `drm_ras` exposes the below operations to
* userspace:
*
* 1. LIST_NODES: Dump all currently registered RAS nodes.
@@ -37,6 +37,10 @@
* Returns all counters of a node if only Node ID is provided or specific
* error counters.
*
+ * 3. CLEAR_ERROR_COUNTER: Clear error counter of a given node.
+ * Userspace must provide Node ID, Error ID.
+ * Clears specific error counter of a node if supported.
+ *
* Node registration:
*
* - drm_ras_node_register(): Registers a new node and assigns
@@ -66,6 +70,8 @@
* operation, fetching all counters from a specific node.
* - drm_ras_nl_get_error_counter_doit(): Implements the GET_ERROR_COUNTER doit
* operation, fetching a counter value from a specific node.
+ * - drm_ras_nl_clear_error_counter_doit(): Implements the CLEAR_ERROR_COUNTER doit
+ * operation, clearing a counter value from a specific node.
*/

static DEFINE_XARRAY_ALLOC(drm_ras_xa);
@@ -314,6 +320,41 @@ int drm_ras_nl_get_error_counter_doit(struct sk_buff *skb,
return doit_reply_value(info, node_id, error_id);
}

+/**
+ * drm_ras_nl_clear_error_counter_doit() - Clear an error counter of a node
+ * @skb: Netlink message buffer
+ * @info: Generic Netlink info containing attributes of the request
+ *
+ * Extracts the node ID and error ID from the netlink attributes and
+ * clears the current value.
+ *
+ * Return: 0 on success, or negative errno on failure.
+ */
+int drm_ras_nl_clear_error_counter_doit(struct sk_buff *skb,
+ struct genl_info *info)
+{
+ struct drm_ras_node *node;
+ u32 node_id, error_id;
+
+ if (!info->attrs ||
+ GENL_REQ_ATTR_CHECK(info, DRM_RAS_A_ERROR_COUNTER_ATTRS_NODE_ID) ||
+ GENL_REQ_ATTR_CHECK(info, DRM_RAS_A_ERROR_COUNTER_ATTRS_ERROR_ID))
+ return -EINVAL;
+
+ node_id = nla_get_u32(info->attrs[DRM_RAS_A_ERROR_COUNTER_ATTRS_NODE_ID]);
+ error_id = nla_get_u32(info->attrs[DRM_RAS_A_ERROR_COUNTER_ATTRS_ERROR_ID]);
+
+ node = xa_load(&drm_ras_xa, node_id);
+ if (!node || !node->clear_error_counter)
+ return -ENOENT;
+
+ if (error_id < node->error_counter_range.first ||
+ error_id > node->error_counter_range.last)
+ return -EINVAL;
+
+ return node->clear_error_counter(node, error_id);
+}
+
/**
* drm_ras_node_register() - Register a new RAS node
* @node: Node structure to register
diff --git a/drivers/gpu/drm/drm_ras_nl.c b/drivers/gpu/drm/drm_ras_nl.c
index 16803d0c4a44..dea1c1b2494e 100644
--- a/drivers/gpu/drm/drm_ras_nl.c
+++ b/drivers/gpu/drm/drm_ras_nl.c
@@ -22,6 +22,12 @@ static const struct nla_policy drm_ras_get_error_counter_dump_nl_policy[DRM_RAS_
[DRM_RAS_A_ERROR_COUNTER_ATTRS_NODE_ID] = { .type = NLA_U32, },
};

+/* DRM_RAS_CMD_CLEAR_ERROR_COUNTER - do */
+static const struct nla_policy drm_ras_clear_error_counter_nl_policy[DRM_RAS_A_ERROR_COUNTER_ATTRS_ERROR_ID + 1] = {
+ [DRM_RAS_A_ERROR_COUNTER_ATTRS_NODE_ID] = { .type = NLA_U32, },
+ [DRM_RAS_A_ERROR_COUNTER_ATTRS_ERROR_ID] = { .type = NLA_U32, },
+};
+
/* Ops table for drm_ras */
static const struct genl_split_ops drm_ras_nl_ops[] = {
{
@@ -43,6 +49,13 @@ static const struct genl_split_ops drm_ras_nl_ops[] = {
.maxattr = DRM_RAS_A_ERROR_COUNTER_ATTRS_NODE_ID,
.flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DUMP,
},
+ {
+ .cmd = DRM_RAS_CMD_CLEAR_ERROR_COUNTER,
+ .doit = drm_ras_nl_clear_error_counter_doit,
+ .policy = drm_ras_clear_error_counter_nl_policy,
+ .maxattr = DRM_RAS_A_ERROR_COUNTER_ATTRS_ERROR_ID,
+ .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
+ },
};

struct genl_family drm_ras_nl_family __ro_after_init = {
diff --git a/drivers/gpu/drm/drm_ras_nl.h b/drivers/gpu/drm/drm_ras_nl.h
index 06ccd9342773..a398643572a5 100644
--- a/drivers/gpu/drm/drm_ras_nl.h
+++ b/drivers/gpu/drm/drm_ras_nl.h
@@ -18,6 +18,8 @@ int drm_ras_nl_get_error_counter_doit(struct sk_buff *skb,
struct genl_info *info);
int drm_ras_nl_get_error_counter_dumpit(struct sk_buff *skb,
struct netlink_callback *cb);
+int drm_ras_nl_clear_error_counter_doit(struct sk_buff *skb,
+ struct genl_info *info);

extern struct genl_family drm_ras_nl_family;

diff --git a/include/drm/drm_ras.h b/include/drm/drm_ras.h
index 5d50209e51db..f2a787bc4f64 100644
--- a/include/drm/drm_ras.h
+++ b/include/drm/drm_ras.h
@@ -58,6 +58,17 @@ struct drm_ras_node {
int (*query_error_counter)(struct drm_ras_node *node, u32 error_id,
const char **name, u32 *val);

+ /**
+ * @clear_error_counter:
+ *
+ * This callback is used by drm_ras to clear a specific error counter.
+ * Driver should implement this callback to support clearing error counters
+ * of a node.
+ *
+ * Returns: 0 on success, negative error code on failure.
+ */
+ int (*clear_error_counter)(struct drm_ras_node *node, u32 error_id);
+
/** @priv: Driver private data */
void *priv;
};
diff --git a/include/uapi/drm/drm_ras.h b/include/uapi/drm/drm_ras.h
index 5f40fa5b869d..218a3ee86805 100644
--- a/include/uapi/drm/drm_ras.h
+++ b/include/uapi/drm/drm_ras.h
@@ -41,6 +41,7 @@ enum {
enum {
DRM_RAS_CMD_LIST_NODES = 1,
DRM_RAS_CMD_GET_ERROR_COUNTER,
+ DRM_RAS_CMD_CLEAR_ERROR_COUNTER,

__DRM_RAS_CMD_MAX,
DRM_RAS_CMD_MAX = (__DRM_RAS_CMD_MAX - 1)
--
2.47.1