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
  21static int
  22perf_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
  61int 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}
  78