diff mbox series

[v3,14/20] coresight: tmc-etr: Introduce the notion of process ID to ETR devices

Message ID 20190404033541.14072-15-mathieu.poirier@linaro.org (mailing list archive)
State New, archived
Headers show
Series coresight: Add support for CPU-wide trace scenarios | expand

Commit Message

Mathieu Poirier April 4, 2019, 3:35 a.m. UTC 
In preparation to support CPU-wide trace scenarios, introduce the notion
of process ID to ETR devices.  That way events monitoring the same process
can use the same etr_buf, allowing multiple CPUs to use the same sink.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
 drivers/hwtracing/coresight/coresight-tmc-etr.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index ac1efdfc0d07..e1774d4bb5f3 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -9,6 +9,7 @@ 
 #include <linux/dma-mapping.h>
 #include <linux/iommu.h>
 #include <linux/slab.h>
+#include <linux/types.h>
 #include <linux/vmalloc.h>
 #include "coresight-catu.h"
 #include "coresight-etm-perf.h"
@@ -25,6 +26,7 @@  struct etr_flat_buf {
 /*
  * etr_perf_buffer - Perf buffer used for ETR
  * @etr_buf		- Actual buffer used by the ETR
+ * @pid			- The PID this etr_perf_buffer belongs to.
  * @snaphost		- Perf session mode
  * @head		- handle->head at the beginning of the session.
  * @nr_pages		- Number of pages in the ring buffer.
@@ -32,6 +34,7 @@  struct etr_flat_buf {
  */
 struct etr_perf_buffer {
 	struct etr_buf		*etr_buf;
+	pid_t			pid;
 	bool			snapshot;
 	unsigned long		head;
 	int			nr_pages;
@@ -1276,6 +1279,7 @@  static void *tmc_alloc_etr_buffer(struct coresight_device *csdev,
 		return NULL;
 	}
 
+	etr_perf->pid = task_pid_nr(event->owner);
 	etr_perf->snapshot = snapshot;
 	etr_perf->nr_pages = nr_pages;
 	etr_perf->pages = pages;