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
  21 static int
  22 perf_evsel__apply_drv_configs(struct perf_evsel *evsel,
  23                               struct perf_evsel_config_term **err_term)
  24 {
  25         bool found = false;
  26         int err = 0;
  27         struct perf_evsel_config_term *term;
  28         struct perf_pmu *pmu = NULL;
  29
  30         while ((pmu = perf_pmu__scan(pmu)) != NULL)
  31                 if (pmu->type == evsel->attr.type) {
  32                         found = true;
  33                         break;
  34                 }
  35
  36         list_for_each_entry(term, &evsel->config_terms, list) {
  37                 if (term->type != PERF_EVSEL__CONFIG_TERM_DRV_CFG)
  38                         continue;
  39
  40                 /*
  41                  * We have a configuration term, report an error if we
  42                  * can't find the PMU or if the PMU driver doesn't support
  43                  * cmd line driver configuration.
  44                  */
  45                 if (!found || !pmu->set_drv_config) {
  46                         err = -EINVAL;
  47                         *err_term = term;
  48                         break;
  49                 }
  50
  51                 err = pmu->set_drv_config(term);
  52                 if (err) {
  53                         *err_term = term;
  54                         break;
  55                 }
  56         }
  57
  58         return err;
  59 }
  60
  61 int perf_evlist__apply_drv_configs(struct perf_evlist *evlist,
  62                                    struct perf_evsel **err_evsel,
  63                                    struct perf_evsel_config_term **err_term)
  64 {
  65         struct perf_evsel *evsel;
  66         int err = 0;
  67
  68         evlist__for_each_entry(evlist, evsel) {
  69                 err = perf_evsel__apply_drv_configs(evsel, err_term);
  70                 if (err) {
  71                         *err_evsel = evsel;
  72                         break;
  73                 }
  74         }
  75
  76         return err;
  77 }