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

From: Rodrigo Vivi <[email-masked]>
Date: Thu, 9 Apr 2026 09:37:41 -0400

On Thu, Apr 09, 2026 at 12:51:44PM +0530, Tauro, Riana wrote:
> Hi Zack
> 
> Could you please take a look at this patch if applicable to your usecase.
> Please let me know if any
> changes are required
> 
> @Rodrigo This is already reviewed by Jakub and Raag.
> If there are no opens, can this be merged via drm_misc

if we push this to drm-misc-next, it might take a few weeks to propagate
back to drm-xe-next. With other work from you and Raag going fast pace
on drm-xe-next around this area, I'm afraid it could cause some conflicts.

It is definitely fine by me, but another option is to get ack from
drm-misc maintainers to get this through drm-xe-next.

so, really okay with drm-misc-next?

> 
> Thanks
> Riana
> 
> On 4/9/2026 1:03 PM, Riana Tauro wrote:
> > 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 <[email-masked]>
> > Cc: Zack McKevitt <[email-masked]>
> > Cc: Lijo Lazar <[email-masked]>
> > Cc: Hawking Zhang <[email-masked]>
> > Cc: David S. Miller <[email-masked]>
> > Cc: Paolo Abeni <[email-masked]>
> > Cc: Eric Dumazet <[email-masked]>
> > Signed-off-by: Riana Tauro <[email-masked]>
> > Reviewed-by: Jakub Kicinski <[email-masked]>
> > Reviewed-by: Raag Jadav <[email-masked]>
> > ---
> >   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)