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[PATCH V4 09/26] coresight: add API to get sink from path

From Mathieu Poirier <mathieu.poirier@linaro.org>
Newsgroups linux.kernel
Subject [PATCH V4 09/26] coresight: add API to get sink from path
Date 2015-11-13 20:00 +0100
Message-ID <qurJM-1FS-13@gated-at.bofh.it> (permalink)
References <qurA6-1CA-9@gated-at.bofh.it>
Organization linux.* mail to news gateway

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Add an API allowing external code to quickly get a handle on the
sink within a path.  The sink is always last, but adding an API allows
to keep the path's node structure private and remove redundant checks.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
 drivers/hwtracing/coresight/coresight-priv.h |  1 +
 drivers/hwtracing/coresight/coresight.c      | 15 +++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
index 2dc59a5c5b1e..ed116b303e87 100644
--- a/drivers/hwtracing/coresight/coresight-priv.h
+++ b/drivers/hwtracing/coresight/coresight-priv.h
@@ -60,6 +60,7 @@ static inline void CS_UNLOCK(void __iomem *addr)
 
 void coresight_disable_path(struct list_head *path);
 int coresight_enable_path(struct list_head *path);
+struct coresight_device *coresight_get_sink(struct list_head *path);
 struct list_head *coresight_build_path(struct coresight_device *csdev);
 void coresight_release_path(struct list_head *path);
 
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index 7e4064b31c99..47a4e109f700 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -322,6 +322,21 @@ err:
 	goto out;
 }
 
+struct coresight_device *coresight_get_sink(struct list_head *path)
+{
+	struct coresight_device *csdev;
+
+	if (!path)
+		return NULL;
+
+	csdev = list_last_entry(path, struct coresight_node, link)->csdev;
+	if (csdev->type != CORESIGHT_DEV_TYPE_SINK &&
+	    csdev->type != CORESIGHT_DEV_TYPE_LINKSINK)
+		return NULL;
+
+	return csdev;
+}
+
 /**
  * _coresight_build_path - recursively build a path from a @csdev to a sink.
  * @csdev:	The device to start from.
-- 
1.9.1

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Thread

[PATCH V4 00/26] Coresight integration with perf  Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 19:50 +0100
  [PATCH V4 25/26] perf tools: making coresight PMU listable Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 19:50 +0100
  [PATCH V4 24/26] perf tools: adding perf_session to *info_prive_size() Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 19:50 +0100
  [PATCH V4 07/26] coresight: moving PM runtime operations to core framework Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 19:50 +0100
  [PATCH V4 10/26] coresight: etm3x: set progbit to stop trace collection Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 19:50 +0100
  [PATCH V4 18/26] coresight: adding operation mode for sink->enable() Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 19:50 +0100
  [PATCH V4 17/26] coresight: etb10: moving to local atomic operations Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 19:50 +0100
  [PATCH V4 22/26] coresight: updating documentation to reflect integration with perf Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 19:50 +0100
  [PATCH V4 26/26] perf tools: adding coresight etm PMU record capabilities Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 19:50 +0100
  [PATCH V4 23/26] perf tools: making function set_max_cpu_num() non static Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 19:50 +0100
  [PATCH V4 20/26] coresight: etm-perf: new PMU driver for ETM tracers Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 19:50 +0100
  [PATCH V4 21/26] coresight: introducing a global trace ID function Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 19:50 +0100
  [PATCH V4 03/26] coresight: etm3x: unlocking tracers in default arch init Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 20:00 +0100
  [PATCH V4 06/26] coresight: associating path with session rather than tracer Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 20:00 +0100
  [PATCH V4 08/26] coresight: etm3x: adding operation mode for etm_enable() Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 20:00 +0100
  [PATCH V4 15/26] coresight: etm3x: implementing perf_enable/disable() API Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 20:00 +0100
  [PATCH V4 09/26] coresight: add API to get sink from path Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 20:00 +0100
  [PATCH V4 12/26] coresight: etm3x: consolidating initial config Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 20:00 +0100
  [PATCH V4 13/26] coresight: etm3x: implementing user/kernel mode tracing Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 20:00 +0100
  [PATCH V4 01/26] coresight: etm3x: moving etm_readl/writel to header file Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 20:00 +0100
  [PATCH V4 14/26] coresight: etm3x: adding perf_get/set_config() API Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 20:00 +0100
  [PATCH V4 11/26] coresight: etm3x: changing default trace configuration Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-11-13 20:00 +0100

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