coresight: tmc-etr: Introduce the notion of process ID to ETR devices (ef848e46) · Commits · 戴 / test

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>

drivers/hwtracing/coresight/coresight-tmc-etr.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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;

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