root/tools/perf/arch/arm/util/auxtrace.c

DEFINITIONS

1. find_all_arm_spe_pmus
2. auxtrace_record__init

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright(C) 2015 Linaro Limited. All rights reserved.
   4  * Author: Mathieu Poirier <mathieu.poirier@linaro.org>
   5  */
   6 
   7 #include <stdbool.h>
   8 #include <linux/coresight-pmu.h>
   9 #include <linux/zalloc.h>
  10 
  11 #include "../../util/auxtrace.h"
  12 #include "../../util/debug.h"
  13 #include "../../util/evlist.h"
  14 #include "../../util/pmu.h"
  15 #include "cs-etm.h"
  16 #include "arm-spe.h"
  17 
  18 static struct perf_pmu **find_all_arm_spe_pmus(int *nr_spes, int *err)
  19 {
  20         struct perf_pmu **arm_spe_pmus = NULL;
  21         int ret, i, nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
  22         /* arm_spe_xxxxxxxxx\0 */
  23         char arm_spe_pmu_name[sizeof(ARM_SPE_PMU_NAME) + 10];
  24 
  25         arm_spe_pmus = zalloc(sizeof(struct perf_pmu *) * nr_cpus);
  26         if (!arm_spe_pmus) {
  27                 pr_err("spes alloc failed\n");
  28                 *err = -ENOMEM;
  29                 return NULL;
  30         }
  31 
  32         for (i = 0; i < nr_cpus; i++) {
  33                 ret = sprintf(arm_spe_pmu_name, "%s%d", ARM_SPE_PMU_NAME, i);
  34                 if (ret < 0) {
  35                         pr_err("sprintf failed\n");
  36                         *err = -ENOMEM;
  37                         return NULL;
  38                 }
  39 
  40                 arm_spe_pmus[*nr_spes] = perf_pmu__find(arm_spe_pmu_name);
  41                 if (arm_spe_pmus[*nr_spes]) {
  42                         pr_debug2("%s %d: arm_spe_pmu %d type %d name %s\n",
  43                                  __func__, __LINE__, *nr_spes,
  44                                  arm_spe_pmus[*nr_spes]->type,
  45                                  arm_spe_pmus[*nr_spes]->name);
  46                         (*nr_spes)++;
  47                 }
  48         }
  49 
  50         return arm_spe_pmus;
  51 }
  52 
  53 struct auxtrace_record
  54 *auxtrace_record__init(struct evlist *evlist, int *err)
  55 {
  56         struct perf_pmu *cs_etm_pmu;
  57         struct evsel *evsel;
  58         bool found_etm = false;
  59         bool found_spe = false;
  60         static struct perf_pmu **arm_spe_pmus = NULL;
  61         static int nr_spes = 0;
  62         int i = 0;
  63 
  64         if (!evlist)
  65                 return NULL;
  66 
  67         cs_etm_pmu = perf_pmu__find(CORESIGHT_ETM_PMU_NAME);
  68 
  69         if (!arm_spe_pmus)
  70                 arm_spe_pmus = find_all_arm_spe_pmus(&nr_spes, err);
  71 
  72         evlist__for_each_entry(evlist, evsel) {
  73                 if (cs_etm_pmu &&
  74                     evsel->core.attr.type == cs_etm_pmu->type)
  75                         found_etm = true;
  76 
  77                 if (!nr_spes)
  78                         continue;
  79 
  80                 for (i = 0; i < nr_spes; i++) {
  81                         if (evsel->core.attr.type == arm_spe_pmus[i]->type) {
  82                                 found_spe = true;
  83                                 break;
  84                         }
  85                 }
  86         }
  87 
  88         if (found_etm && found_spe) {
  89                 pr_err("Concurrent ARM Coresight ETM and SPE operation not currently supported\n");
  90                 *err = -EOPNOTSUPP;
  91                 return NULL;
  92         }
  93 
  94         if (found_etm)
  95                 return cs_etm_record_init(err);
  96 
  97 #if defined(__aarch64__)
  98         if (found_spe)
  99                 return arm_spe_recording_init(err, arm_spe_pmus[i]);
 100 #endif
 101 
 102         /*
 103          * Clear 'err' even if we haven't found an event - that way perf
 104          * record can still be used even if tracers aren't present.  The NULL
 105          * return value will take care of telling the infrastructure HW tracing
 106          * isn't available.
 107          */
 108         *err = 0;
 109         return NULL;
 110 }