perf tools: Add sink configuration for cs_etm PMU
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> Acked-by: Jiri Olsa <jolsa@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1474041004-13956-8-git-send-email-mathieu.poirier@linaro.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -27,12 +27,16 @@
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#include "../../util/auxtrace.h"
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#include "../../util/cpumap.h"
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#include "../../util/evlist.h"
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#include "../../util/evsel.h"
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#include "../../util/pmu.h"
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#include "../../util/thread_map.h"
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#include "../../util/cs-etm.h"
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#include <stdlib.h>
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#define ENABLE_SINK_MAX 128
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#define CS_BUS_DEVICE_PATH "/bus/coresight/devices/"
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struct cs_etm_recording {
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struct auxtrace_record itr;
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struct perf_pmu *cs_etm_pmu;
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@ -557,3 +561,57 @@ struct auxtrace_record *cs_etm_record_init(int *err)
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out:
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return NULL;
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}
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static FILE *cs_device__open_file(const char *name)
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{
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struct stat st;
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char path[PATH_MAX];
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const char *sysfs;
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sysfs = sysfs__mountpoint();
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if (!sysfs)
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return NULL;
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snprintf(path, PATH_MAX,
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"%s" CS_BUS_DEVICE_PATH "%s", sysfs, name);
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printf("path: %s\n", path);
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if (stat(path, &st) < 0)
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return NULL;
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return fopen(path, "w");
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}
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static __attribute__((format(printf, 2, 3)))
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int cs_device__print_file(const char *name, const char *fmt, ...)
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{
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va_list args;
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FILE *file;
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int ret = -EINVAL;
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va_start(args, fmt);
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file = cs_device__open_file(name);
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if (file) {
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ret = vfprintf(file, fmt, args);
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fclose(file);
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}
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va_end(args);
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return ret;
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}
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int cs_etm_set_drv_config(struct perf_evsel_config_term *term)
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{
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int ret;
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char enable_sink[ENABLE_SINK_MAX];
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snprintf(enable_sink, ENABLE_SINK_MAX, "%s/%s",
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term->val.drv_cfg, "enable_sink");
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ret = cs_device__print_file(enable_sink, "%d", 1);
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if (ret < 0)
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return ret;
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return 0;
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}
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@ -18,6 +18,9 @@
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#ifndef INCLUDE__PERF_CS_ETM_H__
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#define INCLUDE__PERF_CS_ETM_H__
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#include "../../util/evsel.h"
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struct auxtrace_record *cs_etm_record_init(int *err);
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int cs_etm_set_drv_config(struct perf_evsel_config_term *term);
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#endif
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@ -19,6 +19,7 @@
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#include <linux/coresight-pmu.h>
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#include <linux/perf_event.h>
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#include "cs-etm.h"
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#include "../../util/pmu.h"
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struct perf_event_attr
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@ -28,6 +29,7 @@ struct perf_event_attr
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if (!strcmp(pmu->name, CORESIGHT_ETM_PMU_NAME)) {
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/* add ETM default config here */
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pmu->selectable = true;
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pmu->set_drv_config = cs_etm_set_drv_config;
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}
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#endif
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return NULL;
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