tools/perf/util/s390-sample-raw.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright IBM Corp. 2019
   4  * Author(s): Thomas Richter <tmricht@linux.ibm.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License (version 2 only)
   8  * as published by the Free Software Foundation.
   9  *
  10  * Architecture specific trace_event function. Save event's bc000 raw data
  11  * to file. File name is aux.ctr.## where ## stands for the CPU number the
  12  * sample was taken from.
  13  */
  14
  15 #include <unistd.h>
  16 #include <stdio.h>
  17 #include <string.h>
  18 #include <inttypes.h>
  19
  20 #include <sys/stat.h>
  21 #include <linux/compiler.h>
  22 #include <asm/byteorder.h>
  23
  24 #include "debug.h"
  25 #include "util.h"
  26 #include "auxtrace.h"
  27 #include "session.h"
  28 #include "evlist.h"
  29 #include "config.h"
  30 #include "color.h"
  31 #include "sample-raw.h"
  32 #include "s390-cpumcf-kernel.h"
  33 #include "pmu-events/pmu-events.h"
  34
  35 static size_t ctrset_size(struct cf_ctrset_entry *set)
  36 {
  37         return sizeof(*set) + set->ctr * sizeof(u64);
  38 }
  39
  40 static bool ctrset_valid(struct cf_ctrset_entry *set)
  41 {
  42         return set->def == S390_CPUMCF_DIAG_DEF;
  43 }
  44
  45 /* CPU Measurement Counter Facility raw data is a byte stream. It is 8 byte
  46  * aligned and might have trailing padding bytes.
  47  * Display the raw data on screen.
  48  */
  49 static bool s390_cpumcfdg_testctr(struct perf_sample *sample)
  50 {
  51         size_t len = sample->raw_size, offset = 0;
  52         unsigned char *buf = sample->raw_data;
  53         struct cf_trailer_entry *te;
  54         struct cf_ctrset_entry *cep, ce;
  55
  56         if (!len)
  57                 return false;
  58         while (offset < len) {
  59                 cep = (struct cf_ctrset_entry *)(buf + offset);
  60                 ce.def = be16_to_cpu(cep->def);
  61                 ce.set = be16_to_cpu(cep->set);
  62                 ce.ctr = be16_to_cpu(cep->ctr);
  63                 ce.res1 = be16_to_cpu(cep->res1);
  64
  65                 if (!ctrset_valid(&ce) || offset + ctrset_size(&ce) > len) {
  66                         /* Raw data for counter sets are always multiple of 8
  67                          * bytes. Prepending a 4 bytes size field to the
  68                          * raw data block in the sample causes the perf tool
  69                          * to append 4 padding bytes to make the raw data part
  70                          * of the sample a multiple of eight bytes again.
  71                          *
  72                          * If the last entry (trailer) is 4 bytes off the raw
  73                          * area data end, all is good.
  74                          */
  75                         if (len - offset - sizeof(*te) == 4)
  76                                 break;
  77                         pr_err("Invalid counter set entry at %zd\n", offset);
  78                         return false;
  79                 }
  80                 offset += ctrset_size(&ce);
  81         }
  82         return true;
  83 }
  84
  85 /* Dump event bc000 on screen, already tested on correctness. */
  86 static void s390_cpumcfdg_dumptrail(const char *color, size_t offset,
  87                                     struct cf_trailer_entry *tep)
  88 {
  89         struct cf_trailer_entry  te;
  90
  91         te.flags = be64_to_cpu(tep->flags);
  92         te.cfvn = be16_to_cpu(tep->cfvn);
  93         te.csvn = be16_to_cpu(tep->csvn);
  94         te.cpu_speed = be32_to_cpu(tep->cpu_speed);
  95         te.timestamp = be64_to_cpu(tep->timestamp);
  96         te.progusage1 = be64_to_cpu(tep->progusage1);
  97         te.progusage2 = be64_to_cpu(tep->progusage2);
  98         te.progusage3 = be64_to_cpu(tep->progusage3);
  99         te.tod_base = be64_to_cpu(tep->tod_base);
 100         te.mach_type = be16_to_cpu(tep->mach_type);
 101         te.res1 = be16_to_cpu(tep->res1);
 102         te.res2 = be32_to_cpu(tep->res2);
 103
 104         color_fprintf(stdout, color, "    [%#08zx] Trailer:%c%c%c%c%c"
 105                       " Cfvn:%d Csvn:%d Speed:%d TOD:%#llx\n",
 106                       offset, te.clock_base ? 'T' : ' ',
 107                       te.speed ? 'S' : ' ', te.mtda ? 'M' : ' ',
 108                       te.caca ? 'C' : ' ', te.lcda ? 'L' : ' ',
 109                       te.cfvn, te.csvn, te.cpu_speed, te.timestamp);
 110         color_fprintf(stdout, color, "\t\t1:%lx 2:%lx 3:%lx TOD-Base:%#llx"
 111                       " Type:%x\n\n",
 112                       te.progusage1, te.progusage2, te.progusage3,
 113                       te.tod_base, te.mach_type);
 114 }
 115
 116 /* Return starting number of a counter set */
 117 static int get_counterset_start(int setnr)
 118 {
 119         switch (setnr) {
 120         case CPUMF_CTR_SET_BASIC:               /* Basic counter set */
 121                 return 0;
 122         case CPUMF_CTR_SET_USER:                /* Problem state counter set */
 123                 return 32;
 124         case CPUMF_CTR_SET_CRYPTO:              /* Crypto counter set */
 125                 return 64;
 126         case CPUMF_CTR_SET_EXT:                 /* Extended counter set */
 127                 return 128;
 128         case CPUMF_CTR_SET_MT_DIAG:             /* Diagnostic counter set */
 129                 return 448;
 130         default:
 131                 return -1;
 132         }
 133 }
 134
 135 /* Scan the PMU table and extract the logical name of a counter from the
 136  * PMU events table. Input is the counter set and counter number with in the
 137  * set. Construct the event number and use this as key. If they match return
 138  * the name of this counter.
 139  * If no match is found a NULL pointer is returned.
 140  */
 141 static const char *get_counter_name(int set, int nr, struct pmu_events_map *map)
 142 {
 143         int rc, event_nr, wanted = get_counterset_start(set) + nr;
 144
 145         if (map) {
 146                 struct pmu_event *evp = map->table;
 147
 148                 for (; evp->name || evp->event || evp->desc; ++evp) {
 149                         if (evp->name == NULL || evp->event == NULL)
 150                                 continue;
 151                         rc = sscanf(evp->event, "event=%x", &event_nr);
 152                         if (rc == 1 && event_nr == wanted)
 153                                 return evp->name;
 154                 }
 155         }
 156         return NULL;
 157 }
 158
 159 static void s390_cpumcfdg_dump(struct perf_sample *sample)
 160 {
 161         size_t i, len = sample->raw_size, offset = 0;
 162         unsigned char *buf = sample->raw_data;
 163         const char *color = PERF_COLOR_BLUE;
 164         struct cf_ctrset_entry *cep, ce;
 165         struct pmu_events_map *map;
 166         struct perf_pmu pmu;
 167         u64 *p;
 168
 169         memset(&pmu, 0, sizeof(pmu));
 170         map = perf_pmu__find_map(&pmu);
 171         while (offset < len) {
 172                 cep = (struct cf_ctrset_entry *)(buf + offset);
 173
 174                 ce.def = be16_to_cpu(cep->def);
 175                 ce.set = be16_to_cpu(cep->set);
 176                 ce.ctr = be16_to_cpu(cep->ctr);
 177                 ce.res1 = be16_to_cpu(cep->res1);
 178
 179                 if (!ctrset_valid(&ce)) {       /* Print trailer */
 180                         s390_cpumcfdg_dumptrail(color, offset,
 181                                                 (struct cf_trailer_entry *)cep);
 182                         return;
 183                 }
 184
 185                 color_fprintf(stdout, color, "    [%#08zx] Counterset:%d"
 186                               " Counters:%d\n", offset, ce.set, ce.ctr);
 187                 for (i = 0, p = (u64 *)(cep + 1); i < ce.ctr; ++i, ++p) {
 188                         const char *ev_name = get_counter_name(ce.set, i, map);
 189
 190                         color_fprintf(stdout, color,
 191                                       "\tCounter:%03d %s Value:%#018lx\n", i,
 192                                       ev_name ?: "<unknown>", be64_to_cpu(*p));
 193                 }
 194                 offset += ctrset_size(&ce);
 195         }
 196 }
 197
 198 /* S390 specific trace event function. Check for PERF_RECORD_SAMPLE events
 199  * and if the event was triggered by a counter set diagnostic event display
 200  * its raw data.
 201  * The function is only invoked when the dump flag -D is set.
 202  */
 203 void perf_evlist__s390_sample_raw(struct perf_evlist *evlist, union perf_event *event,
 204                                   struct perf_sample *sample)
 205 {
 206         struct perf_evsel *ev_bc000;
 207
 208         if (event->header.type != PERF_RECORD_SAMPLE)
 209                 return;
 210
 211         ev_bc000 = perf_evlist__event2evsel(evlist, event);
 212         if (ev_bc000 == NULL ||
 213             ev_bc000->attr.config != PERF_EVENT_CPUM_CF_DIAG)
 214                 return;
 215
 216         /* Display raw data on screen */
 217         if (!s390_cpumcfdg_testctr(sample)) {
 218                 pr_err("Invalid counter set data encountered\n");
 219                 return;
 220         }
 221         s390_cpumcfdg_dump(sample);
 222 }