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interconnect: Add a name to struct icc_path 

When debugging interconnect things, it turned out that saving the path
name and including it in the traces is quite useful, especially for
devices with multiple paths.

For the path name we use the one specified in DT, or if we use platform
data, the name is based on the source and destination node names.

Suggested-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
This commit is contained in:
Georgi Djakov 2019-11-28 16:18:17 +02:00
parent dd018a9cf9
commit 05309830e1
2 changed files with 17 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/interconnect/core.c
View File

@ -356,9 +356,17 @@ struct icc_path *of_icc_get(struct device *dev, const char *name)
mutex_lock(&icc_lock);
path = path_find(dev, src_node, dst_node);
if (IS_ERR(path))
dev_err(dev, "%s: invalid path=%ld\n", __func__, PTR_ERR(path));
mutex_unlock(&icc_lock);
if (IS_ERR(path)) {
dev_err(dev, "%s: invalid path=%ld\n", __func__, PTR_ERR(path));
return path;
}
if (name)
path->name = kstrdup_const(name, GFP_KERNEL);
else
path->name = kasprintf(GFP_KERNEL, "%s-%s",
src_node->name, dst_node->name);
return path;
}
@ -481,9 +489,12 @@ struct icc_path *icc_get(struct device *dev, const int src_id, const int dst_id)
goto out;
path = path_find(dev, src, dst);
if (IS_ERR(path))
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->name, dst->name);
out:
mutex_unlock(&icc_lock);
return path;
@ -519,6 +530,7 @@ void icc_put(struct icc_path *path)
}
mutex_unlock(&icc_lock);
kfree_const(path->name);
kfree(path);
}
EXPORT_SYMBOL_GPL(icc_put);

2
drivers/interconnect/internal.h
View File

@ -29,10 +29,12 @@ struct icc_req {
/**
* struct icc_path - interconnect path structure
* @name: a string name of the path (useful for ftrace)
* @num_nodes: number of hops (nodes)
* @reqs: array of the requests applicable to this path of nodes
*/
struct icc_path {
const char *name;
size_t num_nodes;
struct icc_req reqs[];
};