Commit 1d13d3b7 authored by Mike Tipton's avatar Mike Tipton Committed by Georgi Djakov
Browse files

interconnect: Reintroduce icc_get() 



The original icc_get() that took integer node IDs was removed due to
lack of users. Reintroduce a new version that takes string node names,
which is needed for the debugfs client.

Signed-off-by: default avatarMike Tipton <quic_mdtipton@quicinc.com>
Link: https://lore.kernel.org/r/20230807142914.12480-3-quic_mdtipton@quicinc.com


Signed-off-by: default avatarGeorgi Djakov <djakov@kernel.org>
parent 86b54881

drivers/interconnect/core.c

+63 −0
Original line number Diff line number Diff line
@@ -147,6 +147,21 @@ static struct icc_node *node_find(const int id) 
	return idr_find(&icc_idr, id);

}



static struct icc_node *node_find_by_name(const char *name)

{

	struct icc_provider *provider;

	struct icc_node *n;



	list_for_each_entry(provider, &icc_providers, provider_list) {

		list_for_each_entry(n, &provider->nodes, node_list) {

			if (!strcmp(n->name, name))

				return n;

		}

	}



	return NULL;

}



static struct icc_path *path_init(struct device *dev, struct icc_node *dst,

				  ssize_t num_nodes)

{
@@ -561,6 +576,54 @@ struct icc_path *of_icc_get(struct device *dev, const char *name) 
}

EXPORT_SYMBOL_GPL(of_icc_get);



/**

 * icc_get() - get a path handle between two endpoints

 * @dev: device pointer for the consumer device

 * @src: source node name

 * @dst: destination node name

 *

 * This function will search for a path between two endpoints and return an

 * icc_path handle on success. Use icc_put() to release constraints when they

 * are not needed anymore.

 *

 * Return: icc_path pointer on success or ERR_PTR() on error. NULL is returned

 * when the API is disabled.

 */

struct icc_path *icc_get(struct device *dev, const char *src, const char *dst)

{

	struct icc_node *src_node, *dst_node;

	struct icc_path *path = ERR_PTR(-EPROBE_DEFER);



	mutex_lock(&icc_lock);



	src_node = node_find_by_name(src);

	if (!src_node) {

		dev_err(dev, "%s: invalid src=%s\n", __func__, src);

		goto out;

	}



	dst_node = node_find_by_name(dst);

	if (!dst_node) {

		dev_err(dev, "%s: invalid dst=%s\n", __func__, dst);

		goto out;

	}



	path = path_find(dev, src_node, dst_node);

	if (IS_ERR(path)) {

		dev_err(dev, "%s: invalid path=%ld\n", __func__, PTR_ERR(path));

		goto out;

	}



	path->name = kasprintf(GFP_KERNEL, "%s-%s", src_node->name, dst_node->name);

	if (!path->name) {

		kfree(path);

		path = ERR_PTR(-ENOMEM);

	}

out:

	mutex_unlock(&icc_lock);

	return path;

}



/**

 * icc_set_tag() - set an optional tag on a path

 * @path: the path we want to tag

drivers/interconnect/internal.h

+2 −0
Original line number Diff line number Diff line
@@ -41,4 +41,6 @@ struct icc_path { 
	struct icc_req reqs[];

};



struct icc_path *icc_get(struct device *dev, const char *src, const char *dst);



#endif