Commit 127ab2cc authored by Georgi Djakov's avatar Georgi Djakov

interconnect: Add support for path tags

Consumers may have use cases with different bandwidth requirements based
on the system or driver state. The consumer driver can append a specific
tag to the path and pass this information to the interconnect platform
driver to do the aggregation based on this state.

Introduce icc_set_tag() function that will allow the consumers to append
an optional tag to each path. The aggregation of these tagged paths is
platform specific.
Reviewed-by: default avatarEvan Green <evgreen@chromium.org>
Signed-off-by: default avatarGeorgi Djakov <georgi.djakov@linaro.org>
parent d45331b0
......@@ -29,6 +29,7 @@ static struct dentry *icc_debugfs_dir;
* @req_node: entry in list of requests for the particular @node
* @node: the interconnect node to which this constraint applies
* @dev: reference to the device that sets the constraints
* @tag: path tag (optional)
* @avg_bw: an integer describing the average bandwidth in kBps
* @peak_bw: an integer describing the peak bandwidth in kBps
*/
......@@ -36,6 +37,7 @@ struct icc_req {
struct hlist_node req_node;
struct icc_node *node;
struct device *dev;
u32 tag;
u32 avg_bw;
u32 peak_bw;
};
......@@ -204,7 +206,7 @@ static int aggregate_requests(struct icc_node *node)
node->peak_bw = 0;
hlist_for_each_entry(r, &node->req_list, req_node)
p->aggregate(node, r->avg_bw, r->peak_bw,
p->aggregate(node, r->tag, r->avg_bw, r->peak_bw,
&node->avg_bw, &node->peak_bw);
return 0;
......@@ -385,6 +387,26 @@ struct icc_path *of_icc_get(struct device *dev, const char *name)
}
EXPORT_SYMBOL_GPL(of_icc_get);
/**
* icc_set_tag() - set an optional tag on a path
* @path: the path we want to tag
* @tag: the tag value
*
* This function allows consumers to append a tag to the requests associated
* with a path, so that a different aggregation could be done based on this tag.
*/
void icc_set_tag(struct icc_path *path, u32 tag)
{
int i;
if (!path)
return;
for (i = 0; i < path->num_nodes; i++)
path->reqs[i].tag = tag;
}
EXPORT_SYMBOL_GPL(icc_set_tag);
/**
* icc_set_bw() - set bandwidth constraints on an interconnect path
* @path: reference to the path returned by icc_get()
......
......@@ -626,7 +626,7 @@ static void bcm_aggregate(struct qcom_icc_bcm *bcm)
bcm->dirty = false;
}
static int qcom_icc_aggregate(struct icc_node *node, u32 avg_bw,
static int qcom_icc_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
u32 peak_bw, u32 *agg_avg, u32 *agg_peak)
{
size_t i;
......
......@@ -45,8 +45,8 @@ struct icc_provider {
struct list_head provider_list;
struct list_head nodes;
int (*set)(struct icc_node *src, struct icc_node *dst);
int (*aggregate)(struct icc_node *node, u32 avg_bw, u32 peak_bw,
u32 *agg_avg, u32 *agg_peak);
int (*aggregate)(struct icc_node *node, u32 tag, u32 avg_bw,
u32 peak_bw, u32 *agg_avg, u32 *agg_peak);
struct icc_node* (*xlate)(struct of_phandle_args *spec, void *data);
struct device *dev;
int users;
......
......@@ -30,6 +30,7 @@ struct icc_path *icc_get(struct device *dev, const int src_id,
struct icc_path *of_icc_get(struct device *dev, const char *name);
void icc_put(struct icc_path *path);
int icc_set_bw(struct icc_path *path, u32 avg_bw, u32 peak_bw);
void icc_set_tag(struct icc_path *path, u32 tag);
#else
......@@ -54,6 +55,10 @@ static inline int icc_set_bw(struct icc_path *path, u32 avg_bw, u32 peak_bw)
return 0;
}
static inline void icc_set_tag(struct icc_path *path, u32 tag)
{
}
#endif /* CONFIG_INTERCONNECT */
#endif /* __LINUX_INTERCONNECT_H */
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