Commit b57fc652 authored by Dave Jiang's avatar Dave Jiang
Browse files

drivers/base/node: Add a helper function node_update_perf_attrs() 



Add helper function node_update_perf_attrs() to allow update of node access
coordinates computed by an external agent such as CXL. The helper allows
updating of coordinates after the attribute being created by HMAT.

Acked-by: default avatarDavid Hildenbrand <david@redhat.com>
Reviewed-by: default avatarJonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/20250829222907.1290912-3-dave.jiang@intel.com


Signed-off-by: default avatarDave Jiang <dave.jiang@intel.com>
parent 65128868

drivers/base/node.c

+38 −0
Original line number Diff line number Diff line
@@ -248,6 +248,44 @@ void node_set_perf_attrs(unsigned int nid, struct access_coordinate *coord, 
}

EXPORT_SYMBOL_GPL(node_set_perf_attrs);



/**

 * node_update_perf_attrs - Update the performance values for given access class

 * @nid: Node identifier to be updated

 * @coord: Heterogeneous memory performance coordinates

 * @access: The access class for the given attributes

 */

void node_update_perf_attrs(unsigned int nid, struct access_coordinate *coord,

			    enum access_coordinate_class access)

{

	struct node_access_nodes *access_node;

	struct node *node;

	int i;



	if (WARN_ON_ONCE(!node_online(nid)))

		return;



	node = node_devices[nid];

	list_for_each_entry(access_node, &node->access_list, list_node) {

		if (access_node->access != access)

			continue;



		access_node->coord = *coord;

		for (i = 0; access_attrs[i]; i++) {

			sysfs_notify(&access_node->dev.kobj,

				     NULL, access_attrs[i]->name);

		}

		break;

	}



	/* When setting CPU access coordinates, update mempolicy */

	if (access != ACCESS_COORDINATE_CPU)

		return;



	if (mempolicy_set_node_perf(nid, coord))

		pr_info("failed to set mempolicy attrs for node %d\n", nid);

}

EXPORT_SYMBOL_GPL(node_update_perf_attrs);



/**

 * struct node_cache_info - Internal tracking for memory node caches

 * @dev:	Device represeting the cache level

include/linux/node.h

+8 −0
Original line number Diff line number Diff line
@@ -85,6 +85,8 @@ struct node_cache_attrs { 
void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs);

void node_set_perf_attrs(unsigned int nid, struct access_coordinate *coord,

			 enum access_coordinate_class access);

void node_update_perf_attrs(unsigned int nid, struct access_coordinate *coord,

			    enum access_coordinate_class access);

#else

static inline void node_add_cache(unsigned int nid,

				  struct node_cache_attrs *cache_attrs)
@@ -96,6 +98,12 @@ static inline void node_set_perf_attrs(unsigned int nid, 
				       enum access_coordinate_class access)

{

}



static inline void node_update_perf_attrs(unsigned int nid,

					  struct access_coordinate *coord,

					  enum access_coordinate_class access)

{

}

#endif



struct node {