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authorGeorgi Djakov <georgi.djakov@linaro.org>2019-08-09 15:13:23 +0300
committerGeorgi Djakov <georgi.djakov@linaro.org>2019-08-13 23:02:44 +0300
commit127ab2cc5f19692efe422935267b9db0845b2b04 (patch)
tree104e5154b6166e0c87251ab2ad9948154b809e38 /drivers/interconnect
parentd45331b00ddb179e291766617259261c112db872 (diff)
downloadlinux-127ab2cc5f19692efe422935267b9db0845b2b04.tar.xz
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: Evan Green <evgreen@chromium.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Diffstat (limited to 'drivers/interconnect')
-rw-r--r--drivers/interconnect/core.c24
-rw-r--r--drivers/interconnect/qcom/sdm845.c2
2 files changed, 24 insertions, 2 deletions
diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
index 871eb4bc4efc..251354bb7fdc 100644
--- a/drivers/interconnect/core.c
+++ b/drivers/interconnect/core.c
@@ -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;
@@ -386,6 +388,26 @@ 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()
* @avg_bw: average bandwidth in kilobytes per second
diff --git a/drivers/interconnect/qcom/sdm845.c b/drivers/interconnect/qcom/sdm845.c
index 4915b78da673..fb526004c82e 100644
--- a/drivers/interconnect/qcom/sdm845.c
+++ b/drivers/interconnect/qcom/sdm845.c
@@ -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;