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authorChunyan Zhang <zhang.chunyan@linaro.org>2015-07-31 09:37:26 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-08-05 13:30:15 -0700
commit722102274ab1206634d31abe4f438a911a0945d2 (patch)
treed01e62de326f74e7167ae98ffad435e36c634c72 /include/linux/coresight.h
parentcd196ac3fa5a574f3ddf37b66fbe8c58225c3355 (diff)
downloadop-kernel-dev-722102274ab1206634d31abe4f438a911a0945d2.zip
op-kernel-dev-722102274ab1206634d31abe4f438a911a0945d2.tar.gz
Coresight: Add an interface for supporting ETM3/4 Context ID tracing
If PID namespace is enabled, everytime users configure the Context ID register to trace the specific process, there needs to be a translation between the real PID seen from the kernel and VPID seen from the namespace in which the user's process resides . This patch just adds the translation interface for ETMs. Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/coresight.h')
-rw-r--r--include/linux/coresight.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index 3486b90..626da69 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -248,4 +248,24 @@ static inline struct coresight_platform_data *of_get_coresight_platform_data(
struct device *dev, struct device_node *node) { return NULL; }
#endif
+#ifdef CONFIG_PID_NS
+static inline unsigned long
+coresight_vpid_to_pid(unsigned long vpid)
+{
+ struct task_struct *task = NULL;
+ unsigned long pid = 0;
+
+ rcu_read_lock();
+ task = find_task_by_vpid(vpid);
+ if (task)
+ pid = task_pid_nr(task);
+ rcu_read_unlock();
+
+ return pid;
+}
+#else
+static inline unsigned long
+coresight_vpid_to_pid(unsigned long vpid) { return vpid; }
+#endif
+
#endif
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