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Coresight: Add an interface for supporting ETM3/4 Context ID tracing

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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>
This commit is contained in:
Chunyan Zhang
2015-07-31 09:37:26 -06:00
committed by Greg Kroah-Hartman
parent cd196ac3fa
commit 722102274a
1 changed files with 20 additions and 0 deletions
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20
include/linux/coresight.h
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@@ -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