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

["Tauro, Riana" <riana.tauro@intel.com>]

On 4/10/2026 4:31 AM, Zack McKevitt wrote:
>
> On 4/9/2026 1:21 AM, 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
>>
>
> From a quick glance, I think this looks good from our end. 


Thank you Zack for taking a look.

>
> Thanks,
> Zack
>
>> @Rodrigo This is already reviewed by Jakub and Raag.
>> If there are no opens, can this be merged via drm_misc
>>
>> 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 <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)
>