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Subject[PATCH 3/6] perf tools: Use ioctl function to send sink configuration to kernel
Date
Using sysFS to communicate sink information for a trace session doesn't
work when more than one CPU is involved in the scenario. As such
communicate the sink information to each event by using the SET_DRV_CONFIG
ioctl command.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
tools/perf/arch/arm/util/cs-etm.c | 54 ++++-----------------------------------
1 file changed, 5 insertions(+), 49 deletions(-)

diff --git a/tools/perf/arch/arm/util/cs-etm.c b/tools/perf/arch/arm/util/cs-etm.c
index d8081c2e6d44..cb0978eb7181 100644
--- a/tools/perf/arch/arm/util/cs-etm.c
+++ b/tools/perf/arch/arm/util/cs-etm.c
@@ -599,55 +599,10 @@ struct auxtrace_record *cs_etm_record_init(int *err)
return NULL;
}

-static FILE *cs_device__open_file(const char *name)
+static int cs_etm_set_drv_config_term(struct perf_evsel *evsel,
+ const char *term)
{
- 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);
-
- if (stat(path, &st) < 0)
- return NULL;
-
- return fopen(path, "w");
-
-}
-
-static int __printf(2, 3) 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;
-}
-
-static int cs_etm_set_drv_config_term(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;
+ return perf_evsel__apply_drv_config(evsel, term);
}

int cs_etm_set_drv_config(struct perf_evsel *evsel,
@@ -660,7 +615,8 @@ int cs_etm_set_drv_config(struct perf_evsel *evsel,
if (term->type != PERF_EVSEL__CONFIG_TERM_DRV_CFG)
continue;

- err = cs_etm_set_drv_config_term(term);
+ err = cs_etm_set_drv_config_term(evsel,
+ term->val.drv_cfg);
if (err) {
*err_term = term;
break;
--
2.7.4
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