LXR linux/tools/perf/util/drv

   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
  22static int
  23perf_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
  62int 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}
  79