tools/perf/util/drv_configs.c

   1 /*
   2  * drv_configs.h: Interface to apply PMU specific configuration
   3  * Copyright (c) 2016-2018, Linaro Ltd.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  */
  15
  16 #include "drv_configs.h"
  17 #include "evlist.h"
  18 #include "evsel.h"
  19 #include "pmu.h"
  20 #include <errno.h>
  21
  22 static int
  23 perf_evsel__apply_drv_configs(struct perf_evsel *evsel,
  24                               struct perf_evsel_config_term **err_term)
  25 {
  26         bool found = false;
  27         int err = 0;
  28         struct perf_evsel_config_term *term;
  29         struct perf_pmu *pmu = NULL;
  30
  31         while ((pmu = perf_pmu__scan(pmu)) != NULL)
  32                 if (pmu->type == evsel->attr.type) {
  33                         found = true;
  34                         break;
  35                 }
  36
  37         list_for_each_entry(term, &evsel->config_terms, list) {
  38                 if (term->type != PERF_EVSEL__CONFIG_TERM_DRV_CFG)
  39                         continue;
  40
  41                 /*
  42                  * We have a configuration term, report an error if we
  43                  * can't find the PMU or if the PMU driver doesn't support
  44                  * cmd line driver configuration.
  45                  */
  46                 if (!found || !pmu->set_drv_config) {
  47                         err = -EINVAL;
  48                         *err_term = term;
  49                         break;
  50                 }
  51
  52                 err = pmu->set_drv_config(term);
  53                 if (err) {
  54                         *err_term = term;
  55                         break;
  56                 }
  57         }
  58
  59         return err;
  60 }
  61
  62 int perf_evlist__apply_drv_configs(struct perf_evlist *evlist,
  63                                    struct perf_evsel **err_evsel,
  64                                    struct perf_evsel_config_term **err_term)
  65 {
  66         struct perf_evsel *evsel;
  67         int err = 0;
  68
  69         evlist__for_each_entry(evlist, evsel) {
  70                 err = perf_evsel__apply_drv_configs(evsel, err_term);
  71                 if (err) {
  72                         *err_evsel = evsel;
  73                         break;
  74                 }
  75         }
  76
  77         return err;
  78 }