coresight: tmc-etr: Introduce the notion of reference counting to ETR devices (57549999) · Commits · 戴 / test

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

+5 −0

Original line number	Diff line number	Diff line
		@@ -8,6 +8,7 @@
		#include <linux/coresight.h>
		#include <linux/dma-mapping.h>
		#include <linux/iommu.h>
		#include <linux/refcount.h>
		#include <linux/slab.h>
		#include <linux/types.h>
		#include <linux/vmalloc.h>
		@@ -1222,7 +1223,11 @@ get_perf_etr_buf_per_thread(struct tmc_drvdata *drvdata,
		* with memory allocation.
		*/
		etr_buf = alloc_etr_buf(drvdata, event, nr_pages, pages, snapshot);
		if (IS_ERR(etr_buf))
		goto out;

		refcount_set(&etr_buf->refcount, 1);
		out:
		return etr_buf;
		}

+3 −0

Original line number	Diff line number	Diff line
		@@ -9,6 +9,7 @@

		#include <linux/dma-mapping.h>
		#include <linux/miscdevice.h>
		#include <linux/refcount.h>

		#define TMC_RSZ 0x004
		#define TMC_STS 0x00c
		@@ -133,6 +134,7 @@ struct etr_buf_operations;

		/**
		* struct etr_buf - Details of the buffer used by ETR
		* refcount ; Number of sources currently using this etr_buf.
		* @mode : Mode of the ETR buffer, contiguous, Scatter Gather etc.
		* @full : Trace data overflow
		* @size : Size of the buffer.
		@@ -143,6 +145,7 @@ struct etr_buf_operations;
		* @private : Backend specific information for the buf
		*/
		struct etr_buf {
		refcount_t refcount;
		enum etr_mode mode;
		bool full;
		ssize_t size;