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Groups > linux.kernel > #1283384

[PATCH V6 09/26] coresight: add API to get sink from path

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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 4e326d792100..c02da2edfd80 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.
-- 
2.1.4

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[PATCH V6 00/26] Coresight integration with perf Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-12-03 22:10 +0100
  [PATCH V6 26/26] perf tools: adding coresight etm PMU record capabilities Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-12-03 22:10 +0100
  [PATCH V6 08/26] coresight: etm3x: adding operation mode for etm_enable() Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-12-03 22:20 +0100
  [PATCH V6 11/26] coresight: etm3x: changing default trace configuration Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-12-03 22:20 +0100
  [PATCH V6 18/26] coresight: etb10: implementing AUX space API Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-12-03 22:20 +0100
    Re: [PATCH V6 18/26] coresight: etb10: implementing AUX space API Alexander Shishkin <alexander.shishkin@linux.intel.com> - 2015-12-11 15:10 +0100
      Re: [PATCH V6 18/26] coresight: etb10: implementing AUX space API Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-12-11 22:20 +0100
  [PATCH V6 03/26] coresight: etm3x: unlocking tracers in default arch init Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-12-03 22:20 +0100
  [PATCH V6 07/26] coresight: moving PM runtime operations to core framework Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-12-03 22:20 +0100
  [PATCH V6 05/26] coresight: etm3x: implementing 'cpu_id()' API Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-12-03 22:20 +0100
  [PATCH V6 09/26] coresight: add API to get sink from path Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-12-03 22:20 +0100
  [PATCH V6 01/26] coresight: etm3x: moving etm_readl/writel to header file Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-12-03 22:20 +0100
  [PATCH V6 14/26] coresight: etm3x: adding perf_get/set_config() API Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-12-03 22:20 +0100
  [PATCH V6 17/26] coresight: adding operation mode for sink->enable() Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-12-03 22:20 +0100
  [PATCH V6 06/26] coresight: associating path with session rather than tracer Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-12-03 22:20 +0100
  [PATCH V6 13/26] coresight: etm3x: implementing user/kernel mode tracing Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-12-03 22:20 +0100
  Re: [PATCH V6 00/26] Coresight integration with perf Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-12-08 21:30 +0100
    Re: [PATCH V6 00/26] Coresight integration with perf Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-12-08 21:40 +0100
      Re: [PATCH V6 00/26] Coresight integration with perf Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-12-10 22:30 +0100
  Re: [PATCH V6 00/26] Coresight integration with perf Mathieu Poirier <mathieu.poirier@linaro.org> - 2015-12-08 21:30 +0100

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