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interconnect: Reintroduce icc_get()

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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: Mike Tipton <quic_mdtipton@quicinc.com>
Link: https://lore.kernel.org/r/20230807142914.12480-3-quic_mdtipton@quicinc.com
Signed-off-by: Georgi Djakov <djakov@kernel.org>
This commit is contained in:
Mike Tipton 2023-08-07 07:29:13 -07:00 committed by Georgi Djakov
parent 86b5488121
commit 1d13d3b745
2 changed files with 65 additions and 0 deletions
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63
drivers/interconnect/core.c
View File

@ -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

2
drivers/interconnect/internal.h
View File

@ -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