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Subject[PATCH 26/32] coresight: tmc-etr: Introduce the notion of process ID to ETR devices
Date
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>
Tested-by: Leo Yan <leo.yan@linaro.org>
Tested-by: Robert Walker <robert.walker@arm.com>
---
drivers/hwtracing/coresight/coresight-tmc-etr.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index bca1b2d9ef2e..1acad42184e6 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;
@@ -1277,6 +1280,7 @@ 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;
--
2.17.1
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