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.poir...@linaro.org>
Acked-by: Jiri Olsa <jo...@kernel.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    |  2 ++
 3 files changed, 63 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..98d67399a0d6 100644
--- a/tools/perf/arch/arm/util/pmu.c
+++ b/tools/perf/arch/arm/util/pmu.c
@@ -19,6 +19,7 @@
 #include <linux/coresight-pmu.h>
 #include <linux/perf_event.h>
 
+#include "cs-etm.h"
 #include "../../util/pmu.h"
 
 struct perf_event_attr
@@ -28,6 +29,7 @@ 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

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