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Date: Fri, 8 Feb 2019 19:21:51 +0200
From: Georgi Djakov <georgi.djakov@...aro.org>
To: linux-pm@...r.kernel.org
Cc: daidavid1@...eaurora.org, vincent.guittot@...aro.org,
bjorn.andersson@...aro.org, amit.kucheria@...aro.org,
evgreen@...omium.org, dianders@...omium.org,
seansw@....qualcomm.com, mturquette@...libre.com,
abailon@...libre.com, thierry.reding@...il.com,
ksitaraman@...dia.com, sanjayc@...dia.com,
henryc.chen@...iatek.com, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-arm-msm@...r.kernel.org, georgi.djakov@...aro.org
Subject: [PATCH v1 1/2] 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.
Signed-off-by: Georgi Djakov <georgi.djakov@...aro.org>
---
drivers/interconnect/core.c | 27 +++++++++++++++++++++++----
drivers/interconnect/qcom/sdm845.c | 2 +-
include/linux/interconnect-provider.h | 4 ++--
include/linux/interconnect.h | 5 +++++
4 files changed, 31 insertions(+), 7 deletions(-)
diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
index 6005a1c189f6..31eacd0f5349 100644
--- a/drivers/interconnect/core.c
+++ b/drivers/interconnect/core.c
@@ -42,10 +42,12 @@ struct icc_req {
/**
* struct icc_path - interconnect path structure
+ * @tag: path tag (optional)
* @num_nodes: number of hops (nodes)
* @reqs: array of the requests applicable to this path of nodes
*/
struct icc_path {
+ u32 tag;
size_t num_nodes;
struct icc_req reqs[];
};
@@ -206,7 +208,7 @@ static struct icc_path *path_find(struct device *dev, struct icc_node *src,
* implementing its own aggregate() function.
*/
-static int aggregate_requests(struct icc_node *node)
+static int aggregate_requests(struct icc_node *node, u32 tag)
{
struct icc_provider *p = node->provider;
struct icc_req *r;
@@ -215,7 +217,7 @@ 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, tag, r->avg_bw, r->peak_bw,
&node->avg_bw, &node->peak_bw);
return 0;
@@ -396,6 +398,23 @@ 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 path, so that a
+ * different aggregation could be done based on this tag.
+ */
+void icc_set_tag(struct icc_path *path, u32 tag)
+{
+ if (!path)
+ return;
+
+ path->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()
@@ -434,7 +453,7 @@ int icc_set_bw(struct icc_path *path, u32 avg_bw, u32 peak_bw)
path->reqs[i].peak_bw = peak_bw;
/* aggregate requests for this node */
- aggregate_requests(node);
+ aggregate_requests(node, path->tag);
}
ret = apply_constraints(path);
@@ -446,7 +465,7 @@ int icc_set_bw(struct icc_path *path, u32 avg_bw, u32 peak_bw)
node = path->reqs[i].node;
path->reqs[i].avg_bw = old_avg;
path->reqs[i].peak_bw = old_peak;
- aggregate_requests(node);
+ aggregate_requests(node, path->tag);
}
apply_constraints(path);
}
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;
diff --git a/include/linux/interconnect-provider.h b/include/linux/interconnect-provider.h
index 63caccadc2db..4ee19fd41568 100644
--- a/include/linux/interconnect-provider.h
+++ b/include/linux/interconnect-provider.h
@@ -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;
diff --git a/include/linux/interconnect.h b/include/linux/interconnect.h
index dc25864755ba..d70a914cba11 100644
--- a/include/linux/interconnect.h
+++ b/include/linux/interconnect.h
@@ -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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