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

   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         struct perf_pmu *found_spe = NULL;
  60         struct perf_pmu **arm_spe_pmus = NULL;
  61         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         arm_spe_pmus = find_all_arm_spe_pmus(&nr_spes, err);
  69
  70         evlist__for_each_entry(evlist, evsel) {
  71                 if (cs_etm_pmu &&
  72                     evsel->core.attr.type == cs_etm_pmu->type)
  73                         found_etm = true;
  74
  75                 if (!nr_spes || found_spe)
  76                         continue;
  77
  78                 for (i = 0; i < nr_spes; i++) {
  79                         if (evsel->core.attr.type == arm_spe_pmus[i]->type) {
  80                                 found_spe = arm_spe_pmus[i];
  81                                 break;
  82                         }
  83                 }
  84         }
  85         free(arm_spe_pmus);
  86
  87         if (found_etm && found_spe) {
  88                 pr_err("Concurrent ARM Coresight ETM and SPE operation not currently supported\n");
  89                 *err = -EOPNOTSUPP;
  90                 return NULL;
  91         }
  92
  93         if (found_etm)
  94                 return cs_etm_record_init(err);
  95
  96 #if defined(__aarch64__)
  97         if (found_spe)
  98                 return arm_spe_recording_init(err, found_spe);
  99 #endif
 100
 101         /*
 102          * Clear 'err' even if we haven't found an event - that way perf
 103          * record can still be used even if tracers aren't present.  The NULL
 104          * return value will take care of telling the infrastructure HW tracing
 105          * isn't available.
 106          */
 107         *err = 0;
 108         return NULL;
 109 }
 110
 111 #if defined(__arm__)
 112 u64 compat_auxtrace_mmap__read_head(struct auxtrace_mmap *mm)
 113 {
 114         struct perf_event_mmap_page *pc = mm->userpg;
 115         u64 result;
 116
 117         __asm__ __volatile__(
 118 "       ldrd    %0, %H0, [%1]"
 119         : "=&r" (result)
 120         : "r" (&pc->aux_head), "Qo" (pc->aux_head)
 121         );
 122
 123         return result;
 124 }
 125
 126 int compat_auxtrace_mmap__write_tail(struct auxtrace_mmap *mm, u64 tail)
 127 {
 128         struct perf_event_mmap_page *pc = mm->userpg;
 129
 130         /* Ensure all reads are done before we write the tail out */
 131         smp_mb();
 132
 133         __asm__ __volatile__(
 134 "       strd    %2, %H2, [%1]"
 135         : "=Qo" (pc->aux_tail)
 136         : "r" (&pc->aux_tail), "r" (tail)
 137         );
 138
 139         return 0;
 140 }
 141 #endif