[PATCH V6 5/5] perf tools: adding sink configuration for cs_etm PMU

Mathieu Poirier
2016-08-25T20:27:44Z

Using the PMU::set_drv_config() callback to enable the CoreSight
sink that will be used for the trace session.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
tools/perf/arch/arm/util/cs-etm.c | 58 +++++++++++++++++++++++++++++++++++++++
tools/perf/arch/arm/util/cs-etm.h | 3 ++
tools/perf/arch/arm/util/pmu.c | 3 ++
3 files changed, 64 insertions(+)

diff --git a/tools/perf/arch/arm/util/cs-etm.c b/tools/perf/arch/arm/util/cs-etm.c
index 829c479614f1..47d584da5819 100644
--- a/tools/perf/arch/arm/util/cs-etm.c
+++ b/tools/perf/arch/arm/util/cs-etm.c
@@ -27,12 +27,16 @@
#include "../../util/auxtrace.h"
#include "../../util/cpumap.h"
#include "../../util/evlist.h"
+#include "../../util/evsel.h"
#include "../../util/pmu.h"
#include "../../util/thread_map.h"
#include "../../util/cs-etm.h"

#include <stdlib.h>

+#define ENABLE_SINK_MAX 128
+#define CS_BUS_DEVICE_PATH "/bus/coresight/devices/"
+
struct cs_etm_recording {
struct auxtrace_record itr;
struct perf_pmu *cs_etm_pmu;
@@ -557,3 +561,57 @@ struct auxtrace_record *cs_etm_record_init(int *err)
out:
return NULL;
}
+
+static FILE *cs_device__open_file(const char *name)
+{
+ struct stat st;
+ char path[PATH_MAX];
+ const char *sysfs;
+
+ sysfs = sysfs__mountpoint();
+ if (!sysfs)
+ return NULL;
+
+ snprintf(path, PATH_MAX,
+ "%s" CS_BUS_DEVICE_PATH "%s", sysfs, name);
+
+ printf("path: %s\n", path);
+
+ if (stat(path, &st) < 0)
+ return NULL;
+
+ return fopen(path, "w");
+
+}
+
+static __attribute__((format(printf, 2, 3)))
+int cs_device__print_file(const char *name, const char *fmt, ...)
+{
+ va_list args;
+ FILE *file;
+ int ret = -EINVAL;
+
+ va_start(args, fmt);
+ file = cs_device__open_file(name);
+ if (file) {
+ ret = vfprintf(file, fmt, args);
+ fclose(file);
+ }
+ va_end(args);
+ return ret;
+}
+
+int cs_etm_set_drv_config(struct perf_evsel_config_term *term)
+{
+ int ret;
+ char enable_sink[ENABLE_SINK_MAX];
+
+ snprintf(enable_sink, ENABLE_SINK_MAX, "%s/%s",
+ term->val.drv_cfg, "enable_sink");
+
+ ret = cs_device__print_file(enable_sink, "%d", 1);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
diff --git a/tools/perf/arch/arm/util/cs-etm.h b/tools/perf/arch/arm/util/cs-etm.h
index 909f486d02d1..5256741be549 100644
--- a/tools/perf/arch/arm/util/cs-etm.h
+++ b/tools/perf/arch/arm/util/cs-etm.h
@@ -18,6 +18,9 @@
#ifndef INCLUDE__PERF_CS_ETM_H__
#define INCLUDE__PERF_CS_ETM_H__

+#include "../../util/evsel.h"
+
struct auxtrace_record *cs_etm_record_init(int *err);
+int cs_etm_set_drv_config(struct perf_evsel_config_term *term);

#endif
diff --git a/tools/perf/arch/arm/util/pmu.c b/tools/perf/arch/arm/util/pmu.c
index af9fb666b44f..c11f8a13d14d 100644
--- a/tools/perf/arch/arm/util/pmu.c
+++ b/tools/perf/arch/arm/util/pmu.c
@@ -19,8 +19,10 @@
#include <linux/coresight-pmu.h>
#include <linux/perf_event.h>

+#include "cs-etm.h"
#include "../../util/pmu.h"

+
struct perf_event_attr
*perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused)
{
@@ -28,6 +30,7 @@ struct perf_event_attr
if (!strcmp(pmu->name, CORESIGHT_ETM_PMU_NAME)) {
/* add ETM default config here */
pmu->selectable = true;
+ pmu->set_drv_config = cs_etm_set_drv_config;
}
#endif
return NULL;
--
2.7.4