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coresight: tmc-etr: Introduce the notion of process ID to ETR devices

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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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathieu Poirier 2019-04-25 13:53:04 -06:00 committed by Greg Kroah-Hartman
parent e553a8aef4
commit ef848e463a
1 changed files with 4 additions and 0 deletions
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4
drivers/hwtracing/coresight/coresight-tmc-etr.c
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@ -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;