3 files changed, 63 insertions, 0 deletions

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;