Keep track of enabled sink buffers as a path between source
and sinks is being built. That way sinks associated to a
source can be accessed quickly.
Signed-off-by: Mathieu Poirier <mathieu.poir...@linaro.org>
---
drivers/hwtracing/coresight/coresight-priv.h | 3 ++-
drivers/hwtracing/coresight/coresight.c | 16 ++++++++++------
include/linux/coresight.h | 2 ++
3 files changed, 14 insertions(+), 7 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-priv.h
b/drivers/hwtracing/coresight/coresight-priv.h
index 8a52fdcb4bd6..3d7467f315ed 100644
--- a/drivers/hwtracing/coresight/coresight-priv.h
+++ b/drivers/hwtracing/coresight/coresight-priv.h
@@ -53,7 +53,8 @@ static inline void CS_UNLOCK(void __iomem *addr)
}
int coresight_build_paths(struct coresight_device *csdev,
- struct list_head *path, bool enable);
+ struct list_head *path,
+ struct list_head *sinks, bool enable);
#ifdef CONFIG_CORESIGHT_SOURCE_ETM3X
extern int etm_readl_cp14(u32 off, unsigned int *val);
diff --git a/drivers/hwtracing/coresight/coresight.c
b/drivers/hwtracing/coresight/coresight.c
index 083080d435af..a40519d5a9e2 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -302,7 +302,8 @@ static int coresight_disable_path(struct list_head *path)
}
int coresight_build_paths(struct coresight_device *csdev,
- struct list_head *path, bool enable)
+ struct list_head *path,
+ struct list_head *sinks, bool enable)
{
int i, ret = -EINVAL;
struct coresight_connection *conn;
@@ -312,15 +313,18 @@ int coresight_build_paths(struct coresight_device *csdev,
if ((csdev->type == CORESIGHT_DEV_TYPE_SINK ||
csdev->type == CORESIGHT_DEV_TYPE_LINKSINK) &&
csdev->activated) {
- if (enable)
+ if (enable) {
ret = coresight_enable_path(path);
- else
+ if (!ret && sinks)
+ list_add(&csdev->sinks, sinks);
+ } else {
ret = coresight_disable_path(path);
+ }
} else {
for (i = 0; i < csdev->nr_outport; i++) {
conn = &csdev->conns[i];
if (coresight_build_paths(conn->child_dev,
- path, enable) == 0)
+ path, sinks, enable) == 0)
ret = 0;
}
}
@@ -347,7 +351,7 @@ int coresight_enable(struct coresight_device *csdev)
if (csdev->enable)
goto out;
- if (coresight_build_paths(csdev, &path, true)) {
+ if (coresight_build_paths(csdev, &path, NULL, true)) {
dev_err(&csdev->dev, "building path(s) failed\n");
goto out;
}
@@ -373,7 +377,7 @@ void coresight_disable(struct coresight_device *csdev)
goto out;
coresight_disable_source(csdev);
- if (coresight_build_paths(csdev, &path, false))
+ if (coresight_build_paths(csdev, &path, NULL, false))
dev_err(&csdev->dev, "releasing path(s) failed\n");
out:
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index 0601da01eeb2..dd530a6d3e21 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -153,6 +153,7 @@ struct coresight_connection {
* @dev: The device entity associated to this component.
* @refcnt: keep track of what is in use.
* @path_link: link of current component into the path being enabled.
+ * @sinks: link of currently enabled sinks for a source.
* @orphan: true if the component has connections that haven't been linked.
* @enable: 'true' if component is currently part of an active path.
* @activated: 'true' only if a _sink_ has been activated. A sink can be
@@ -169,6 +170,7 @@ struct coresight_device {
struct device dev;
atomic_t *refcnt;
struct list_head path_link;
+ struct list_head sinks;
bool orphan;
bool enable; /* true only if configured as part of a path */
bool activated; /* true only if a sink is part of a path */
--
1.9.1
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