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authorMathieu Poirier <mathieu.poirier@linaro.org>2019-04-25 13:53:06 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-04-25 22:00:18 +0200
commitc5ff734462b1d32f793db717ef222cd05e6232d5 (patch)
tree363a1dc723d57478321f39975d23714504dc8235 /drivers/hwtracing
parent57549999b9a0d0c72900d2413ef1e3168bd2e817 (diff)
downloadlinux-c5ff734462b1d32f793db717ef222cd05e6232d5.tar.bz2
coresight: tmc-etr: Introduce the notion of IDR to ETR devices
In CPU-wide scenarios with an N:1 source/sink topology, sources share the same sink. In order to reuse the same sink for all sources an IDR is needed to archive events that have already been accounted for. 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>
Diffstat (limited to 'drivers/hwtracing')
-rw-r--r--drivers/hwtracing/coresight/coresight-tmc.c4
-rw-r--r--drivers/hwtracing/coresight/coresight-tmc.h6
2 files changed, 10 insertions, 0 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
index c6a5462ebf27..9f9b2c514566 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c
@@ -8,10 +8,12 @@
#include <linux/init.h>
#include <linux/types.h>
#include <linux/device.h>
+#include <linux/idr.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
+#include <linux/mutex.h>
#include <linux/property.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
@@ -450,6 +452,8 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
coresight_get_uci_data(id));
if (ret)
goto out;
+ idr_init(&drvdata->idr);
+ mutex_init(&drvdata->idr_mutex);
break;
case TMC_CONFIG_TYPE_ETF:
desc.type = CORESIGHT_DEV_TYPE_LINKSINK;
diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
index ee44906dffe8..c1b1700b2df7 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.h
+++ b/drivers/hwtracing/coresight/coresight-tmc.h
@@ -8,7 +8,9 @@
#define _CORESIGHT_TMC_H
#include <linux/dma-mapping.h>
+#include <linux/idr.h>
#include <linux/miscdevice.h>
+#include <linux/mutex.h>
#include <linux/refcount.h>
#define TMC_RSZ 0x004
@@ -173,6 +175,8 @@ struct etr_buf {
* @trigger_cntr: amount of words to store after a trigger.
* @etr_caps: Bitmask of capabilities of the TMC ETR, inferred from the
* device configuration register (DEVID)
+ * @idr: Holds etr_bufs allocated for this ETR.
+ * @idr_mutex: Access serialisation for idr.
* @perf_data: PERF buffer for ETR.
* @sysfs_data: SYSFS buffer for ETR.
*/
@@ -194,6 +198,8 @@ struct tmc_drvdata {
enum tmc_mem_intf_width memwidth;
u32 trigger_cntr;
u32 etr_caps;
+ struct idr idr;
+ struct mutex idr_mutex;
struct etr_buf *sysfs_buf;
void *perf_data;
};