tools/perf/arch/arm/util/cs-etm.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 <api/fs/fs.h>
   8 #include <linux/bits.h>
   9 #include <linux/bitops.h>
  10 #include <linux/compiler.h>
  11 #include <linux/coresight-pmu.h>
  12 #include <linux/kernel.h>
  13 #include <linux/log2.h>
  14 #include <linux/string.h>
  15 #include <linux/types.h>
  16 #include <linux/zalloc.h>
  17
  18 #include "cs-etm.h"
  19 #include "../../util/debug.h"
  20 #include "../../util/record.h"
  21 #include "../../util/auxtrace.h"
  22 #include "../../util/cpumap.h"
  23 #include "../../util/event.h"
  24 #include "../../util/evlist.h"
  25 #include "../../util/evsel.h"
  26 #include "../../util/perf_api_probe.h"
  27 #include "../../util/evsel_config.h"
  28 #include "../../util/pmu.h"
  29 #include "../../util/cs-etm.h"
  30 #include <internal/lib.h> // page_size
  31 #include "../../util/session.h"
  32
  33 #include <errno.h>
  34 #include <stdlib.h>
  35 #include <sys/stat.h>
  36
  37 struct cs_etm_recording {
  38         struct auxtrace_record  itr;
  39         struct perf_pmu         *cs_etm_pmu;
  40         struct evlist           *evlist;
  41         bool                    snapshot_mode;
  42         size_t                  snapshot_size;
  43 };
  44
  45 static const char *metadata_etmv3_ro[CS_ETM_PRIV_MAX] = {
  46         [CS_ETM_ETMCCER]        = "mgmt/etmccer",
  47         [CS_ETM_ETMIDR]         = "mgmt/etmidr",
  48 };
  49
  50 static const char * const metadata_etmv4_ro[] = {
  51         [CS_ETMV4_TRCIDR0]              = "trcidr/trcidr0",
  52         [CS_ETMV4_TRCIDR1]              = "trcidr/trcidr1",
  53         [CS_ETMV4_TRCIDR2]              = "trcidr/trcidr2",
  54         [CS_ETMV4_TRCIDR8]              = "trcidr/trcidr8",
  55         [CS_ETMV4_TRCAUTHSTATUS]        = "mgmt/trcauthstatus",
  56         [CS_ETE_TRCDEVARCH]             = "mgmt/trcdevarch"
  57 };
  58
  59 static bool cs_etm_is_etmv4(struct auxtrace_record *itr, int cpu);
  60 static bool cs_etm_is_ete(struct auxtrace_record *itr, int cpu);
  61
  62 static int cs_etm_set_context_id(struct auxtrace_record *itr,
  63                                  struct evsel *evsel, int cpu)
  64 {
  65         struct cs_etm_recording *ptr;
  66         struct perf_pmu *cs_etm_pmu;
  67         char path[PATH_MAX];
  68         int err = -EINVAL;
  69         u32 val;
  70         u64 contextid;
  71
  72         ptr = container_of(itr, struct cs_etm_recording, itr);
  73         cs_etm_pmu = ptr->cs_etm_pmu;
  74
  75         if (!cs_etm_is_etmv4(itr, cpu))
  76                 goto out;
  77
  78         /* Get a handle on TRCIDR2 */
  79         snprintf(path, PATH_MAX, "cpu%d/%s",
  80                  cpu, metadata_etmv4_ro[CS_ETMV4_TRCIDR2]);
  81         err = perf_pmu__scan_file(cs_etm_pmu, path, "%x", &val);
  82
  83         /* There was a problem reading the file, bailing out */
  84         if (err != 1) {
  85                 pr_err("%s: can't read file %s\n",
  86                        CORESIGHT_ETM_PMU_NAME, path);
  87                 goto out;
  88         }
  89
  90         /* User has configured for PID tracing, respects it. */
  91         contextid = evsel->core.attr.config &
  92                         (BIT(ETM_OPT_CTXTID) | BIT(ETM_OPT_CTXTID2));
  93
  94         /*
  95          * If user doesn't configure the contextid format, parse PMU format and
  96          * enable PID tracing according to the "contextid" format bits:
  97          *
  98          *   If bit ETM_OPT_CTXTID is set, trace CONTEXTIDR_EL1;
  99          *   If bit ETM_OPT_CTXTID2 is set, trace CONTEXTIDR_EL2.
 100          */
 101         if (!contextid)
 102                 contextid = perf_pmu__format_bits(&cs_etm_pmu->format,
 103                                                   "contextid");
 104
 105         if (contextid & BIT(ETM_OPT_CTXTID)) {
 106                 /*
 107                  * TRCIDR2.CIDSIZE, bit [9-5], indicates whether contextID
 108                  * tracing is supported:
 109                  *  0b00000 Context ID tracing is not supported.
 110                  *  0b00100 Maximum of 32-bit Context ID size.
 111                  *  All other values are reserved.
 112                  */
 113                 val = BMVAL(val, 5, 9);
 114                 if (!val || val != 0x4) {
 115                         pr_err("%s: CONTEXTIDR_EL1 isn't supported\n",
 116                                CORESIGHT_ETM_PMU_NAME);
 117                         err = -EINVAL;
 118                         goto out;
 119                 }
 120         }
 121
 122         if (contextid & BIT(ETM_OPT_CTXTID2)) {
 123                 /*
 124                  * TRCIDR2.VMIDOPT[30:29] != 0 and
 125                  * TRCIDR2.VMIDSIZE[14:10] == 0b00100 (32bit virtual contextid)
 126                  * We can't support CONTEXTIDR in VMID if the size of the
 127                  * virtual context id is < 32bit.
 128                  * Any value of VMIDSIZE >= 4 (i.e, > 32bit) is fine for us.
 129                  */
 130                 if (!BMVAL(val, 29, 30) || BMVAL(val, 10, 14) < 4) {
 131                         pr_err("%s: CONTEXTIDR_EL2 isn't supported\n",
 132                                CORESIGHT_ETM_PMU_NAME);
 133                         err = -EINVAL;
 134                         goto out;
 135                 }
 136         }
 137
 138         /* All good, let the kernel know */
 139         evsel->core.attr.config |= contextid;
 140         err = 0;
 141
 142 out:
 143         return err;
 144 }
 145
 146 static int cs_etm_set_timestamp(struct auxtrace_record *itr,
 147                                 struct evsel *evsel, int cpu)
 148 {
 149         struct cs_etm_recording *ptr;
 150         struct perf_pmu *cs_etm_pmu;
 151         char path[PATH_MAX];
 152         int err = -EINVAL;
 153         u32 val;
 154
 155         ptr = container_of(itr, struct cs_etm_recording, itr);
 156         cs_etm_pmu = ptr->cs_etm_pmu;
 157
 158         if (!cs_etm_is_etmv4(itr, cpu))
 159                 goto out;
 160
 161         /* Get a handle on TRCIRD0 */
 162         snprintf(path, PATH_MAX, "cpu%d/%s",
 163                  cpu, metadata_etmv4_ro[CS_ETMV4_TRCIDR0]);
 164         err = perf_pmu__scan_file(cs_etm_pmu, path, "%x", &val);
 165
 166         /* There was a problem reading the file, bailing out */
 167         if (err != 1) {
 168                 pr_err("%s: can't read file %s\n",
 169                        CORESIGHT_ETM_PMU_NAME, path);
 170                 goto out;
 171         }
 172
 173         /*
 174          * TRCIDR0.TSSIZE, bit [28-24], indicates whether global timestamping
 175          * is supported:
 176          *  0b00000 Global timestamping is not implemented
 177          *  0b00110 Implementation supports a maximum timestamp of 48bits.
 178          *  0b01000 Implementation supports a maximum timestamp of 64bits.
 179          */
 180         val &= GENMASK(28, 24);
 181         if (!val) {
 182                 err = -EINVAL;
 183                 goto out;
 184         }
 185
 186         /* All good, let the kernel know */
 187         evsel->core.attr.config |= (1 << ETM_OPT_TS);
 188         err = 0;
 189
 190 out:
 191         return err;
 192 }
 193
 194 #define ETM_SET_OPT_CTXTID      (1 << 0)
 195 #define ETM_SET_OPT_TS          (1 << 1)
 196 #define ETM_SET_OPT_MASK        (ETM_SET_OPT_CTXTID | ETM_SET_OPT_TS)
 197
 198 static int cs_etm_set_option(struct auxtrace_record *itr,
 199                              struct evsel *evsel, u32 option)
 200 {
 201         int i, err = -EINVAL;
 202         struct perf_cpu_map *event_cpus = evsel->evlist->core.cpus;
 203         struct perf_cpu_map *online_cpus = perf_cpu_map__new(NULL);
 204
 205         /* Set option of each CPU we have */
 206         for (i = 0; i < cpu__max_cpu(); i++) {
 207                 if (!cpu_map__has(event_cpus, i) ||
 208                     !cpu_map__has(online_cpus, i))
 209                         continue;
 210
 211                 if (option & BIT(ETM_OPT_CTXTID)) {
 212                         err = cs_etm_set_context_id(itr, evsel, i);
 213                         if (err)
 214                                 goto out;
 215                 }
 216                 if (option & BIT(ETM_OPT_TS)) {
 217                         err = cs_etm_set_timestamp(itr, evsel, i);
 218                         if (err)
 219                                 goto out;
 220                 }
 221                 if (option & ~(BIT(ETM_OPT_CTXTID) | BIT(ETM_OPT_TS)))
 222                         /* Nothing else is currently supported */
 223                         goto out;
 224         }
 225
 226         err = 0;
 227 out:
 228         perf_cpu_map__put(online_cpus);
 229         return err;
 230 }
 231
 232 static int cs_etm_parse_snapshot_options(struct auxtrace_record *itr,
 233                                          struct record_opts *opts,
 234                                          const char *str)
 235 {
 236         struct cs_etm_recording *ptr =
 237                                 container_of(itr, struct cs_etm_recording, itr);
 238         unsigned long long snapshot_size = 0;
 239         char *endptr;
 240
 241         if (str) {
 242                 snapshot_size = strtoull(str, &endptr, 0);
 243                 if (*endptr || snapshot_size > SIZE_MAX)
 244                         return -1;
 245         }
 246
 247         opts->auxtrace_snapshot_mode = true;
 248         opts->auxtrace_snapshot_size = snapshot_size;
 249         ptr->snapshot_size = snapshot_size;
 250
 251         return 0;
 252 }
 253
 254 static int cs_etm_set_sink_attr(struct perf_pmu *pmu,
 255                                 struct evsel *evsel)
 256 {
 257         char msg[BUFSIZ], path[PATH_MAX], *sink;
 258         struct evsel_config_term *term;
 259         int ret = -EINVAL;
 260         u32 hash;
 261
 262         if (evsel->core.attr.config2 & GENMASK(31, 0))
 263                 return 0;
 264
 265         list_for_each_entry(term, &evsel->config_terms, list) {
 266                 if (term->type != EVSEL__CONFIG_TERM_DRV_CFG)
 267                         continue;
 268
 269                 sink = term->val.str;
 270                 snprintf(path, PATH_MAX, "sinks/%s", sink);
 271
 272                 ret = perf_pmu__scan_file(pmu, path, "%x", &hash);
 273                 if (ret != 1) {
 274                         pr_err("failed to set sink \"%s\" on event %s with %d (%s)\n",
 275                                sink, evsel__name(evsel), errno,
 276                                str_error_r(errno, msg, sizeof(msg)));
 277                         return ret;
 278                 }
 279
 280                 evsel->core.attr.config2 |= hash;
 281                 return 0;
 282         }
 283
 284         /*
 285          * No sink was provided on the command line - allow the CoreSight
 286          * system to look for a default
 287          */
 288         return 0;
 289 }
 290
 291 static int cs_etm_recording_options(struct auxtrace_record *itr,
 292                                     struct evlist *evlist,
 293                                     struct record_opts *opts)
 294 {
 295         int ret;
 296         struct cs_etm_recording *ptr =
 297                                 container_of(itr, struct cs_etm_recording, itr);
 298         struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
 299         struct evsel *evsel, *cs_etm_evsel = NULL;
 300         struct perf_cpu_map *cpus = evlist->core.cpus;
 301         bool privileged = perf_event_paranoid_check(-1);
 302         int err = 0;
 303
 304         ptr->evlist = evlist;
 305         ptr->snapshot_mode = opts->auxtrace_snapshot_mode;
 306
 307         if (!record_opts__no_switch_events(opts) &&
 308             perf_can_record_switch_events())
 309                 opts->record_switch_events = true;
 310
 311         evlist__for_each_entry(evlist, evsel) {
 312                 if (evsel->core.attr.type == cs_etm_pmu->type) {
 313                         if (cs_etm_evsel) {
 314                                 pr_err("There may be only one %s event\n",
 315                                        CORESIGHT_ETM_PMU_NAME);
 316                                 return -EINVAL;
 317                         }
 318                         evsel->core.attr.freq = 0;
 319                         evsel->core.attr.sample_period = 1;
 320                         cs_etm_evsel = evsel;
 321                         opts->full_auxtrace = true;
 322                 }
 323         }
 324
 325         /* no need to continue if at least one event of interest was found */
 326         if (!cs_etm_evsel)
 327                 return 0;
 328
 329         ret = cs_etm_set_sink_attr(cs_etm_pmu, cs_etm_evsel);
 330         if (ret)
 331                 return ret;
 332
 333         if (opts->use_clockid) {
 334                 pr_err("Cannot use clockid (-k option) with %s\n",
 335                        CORESIGHT_ETM_PMU_NAME);
 336                 return -EINVAL;
 337         }
 338
 339         /* we are in snapshot mode */
 340         if (opts->auxtrace_snapshot_mode) {
 341                 /*
 342                  * No size were given to '-S' or '-m,', so go with
 343                  * the default
 344                  */
 345                 if (!opts->auxtrace_snapshot_size &&
 346                     !opts->auxtrace_mmap_pages) {
 347                         if (privileged) {
 348                                 opts->auxtrace_mmap_pages = MiB(4) / page_size;
 349                         } else {
 350                                 opts->auxtrace_mmap_pages =
 351                                                         KiB(128) / page_size;
 352                                 if (opts->mmap_pages == UINT_MAX)
 353                                         opts->mmap_pages = KiB(256) / page_size;
 354                         }
 355                 } else if (!opts->auxtrace_mmap_pages && !privileged &&
 356                                                 opts->mmap_pages == UINT_MAX) {
 357                         opts->mmap_pages = KiB(256) / page_size;
 358                 }
 359
 360                 /*
 361                  * '-m,xyz' was specified but no snapshot size, so make the
 362                  * snapshot size as big as the auxtrace mmap area.
 363                  */
 364                 if (!opts->auxtrace_snapshot_size) {
 365                         opts->auxtrace_snapshot_size =
 366                                 opts->auxtrace_mmap_pages * (size_t)page_size;
 367                 }
 368
 369                 /*
 370                  * -Sxyz was specified but no auxtrace mmap area, so make the
 371                  * auxtrace mmap area big enough to fit the requested snapshot
 372                  * size.
 373                  */
 374                 if (!opts->auxtrace_mmap_pages) {
 375                         size_t sz = opts->auxtrace_snapshot_size;
 376
 377                         sz = round_up(sz, page_size) / page_size;
 378                         opts->auxtrace_mmap_pages = roundup_pow_of_two(sz);
 379                 }
 380
 381                 /* Snapshot size can't be bigger than the auxtrace area */
 382                 if (opts->auxtrace_snapshot_size >
 383                                 opts->auxtrace_mmap_pages * (size_t)page_size) {
 384                         pr_err("Snapshot size %zu must not be greater than AUX area tracing mmap size %zu\n",
 385                                opts->auxtrace_snapshot_size,
 386                                opts->auxtrace_mmap_pages * (size_t)page_size);
 387                         return -EINVAL;
 388                 }
 389
 390                 /* Something went wrong somewhere - this shouldn't happen */
 391                 if (!opts->auxtrace_snapshot_size ||
 392                     !opts->auxtrace_mmap_pages) {
 393                         pr_err("Failed to calculate default snapshot size and/or AUX area tracing mmap pages\n");
 394                         return -EINVAL;
 395                 }
 396         }
 397
 398         /* We are in full trace mode but '-m,xyz' wasn't specified */
 399         if (opts->full_auxtrace && !opts->auxtrace_mmap_pages) {
 400                 if (privileged) {
 401                         opts->auxtrace_mmap_pages = MiB(4) / page_size;
 402                 } else {
 403                         opts->auxtrace_mmap_pages = KiB(128) / page_size;
 404                         if (opts->mmap_pages == UINT_MAX)
 405                                 opts->mmap_pages = KiB(256) / page_size;
 406                 }
 407
 408         }
 409
 410         /* Validate auxtrace_mmap_pages provided by user */
 411         if (opts->auxtrace_mmap_pages) {
 412                 unsigned int max_page = (KiB(128) / page_size);
 413                 size_t sz = opts->auxtrace_mmap_pages * (size_t)page_size;
 414
 415                 if (!privileged &&
 416                     opts->auxtrace_mmap_pages > max_page) {
 417                         opts->auxtrace_mmap_pages = max_page;
 418                         pr_err("auxtrace too big, truncating to %d\n",
 419                                max_page);
 420                 }
 421
 422                 if (!is_power_of_2(sz)) {
 423                         pr_err("Invalid mmap size for %s: must be a power of 2\n",
 424                                CORESIGHT_ETM_PMU_NAME);
 425                         return -EINVAL;
 426                 }
 427         }
 428
 429         if (opts->auxtrace_snapshot_mode)
 430                 pr_debug2("%s snapshot size: %zu\n", CORESIGHT_ETM_PMU_NAME,
 431                           opts->auxtrace_snapshot_size);
 432
 433         /*
 434          * To obtain the auxtrace buffer file descriptor, the auxtrace
 435          * event must come first.
 436          */
 437         evlist__to_front(evlist, cs_etm_evsel);
 438
 439         /*
 440          * In the case of per-cpu mmaps, we need the CPU on the
 441          * AUX event.  We also need the contextID in order to be notified
 442          * when a context switch happened.
 443          */
 444         if (!perf_cpu_map__empty(cpus)) {
 445                 evsel__set_sample_bit(cs_etm_evsel, CPU);
 446
 447                 err = cs_etm_set_option(itr, cs_etm_evsel,
 448                                         BIT(ETM_OPT_CTXTID) | BIT(ETM_OPT_TS));
 449                 if (err)
 450                         goto out;
 451         }
 452
 453         /* Add dummy event to keep tracking */
 454         if (opts->full_auxtrace) {
 455                 struct evsel *tracking_evsel;
 456
 457                 err = parse_events(evlist, "dummy:u", NULL);
 458                 if (err)
 459                         goto out;
 460
 461                 tracking_evsel = evlist__last(evlist);
 462                 evlist__set_tracking_event(evlist, tracking_evsel);
 463
 464                 tracking_evsel->core.attr.freq = 0;
 465                 tracking_evsel->core.attr.sample_period = 1;
 466
 467                 /* In per-cpu case, always need the time of mmap events etc */
 468                 if (!perf_cpu_map__empty(cpus))
 469                         evsel__set_sample_bit(tracking_evsel, TIME);
 470         }
 471
 472 out:
 473         return err;
 474 }
 475
 476 static u64 cs_etm_get_config(struct auxtrace_record *itr)
 477 {
 478         u64 config = 0;
 479         struct cs_etm_recording *ptr =
 480                         container_of(itr, struct cs_etm_recording, itr);
 481         struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
 482         struct evlist *evlist = ptr->evlist;
 483         struct evsel *evsel;
 484
 485         evlist__for_each_entry(evlist, evsel) {
 486                 if (evsel->core.attr.type == cs_etm_pmu->type) {
 487                         /*
 488                          * Variable perf_event_attr::config is assigned to
 489                          * ETMv3/PTM.  The bit fields have been made to match
 490                          * the ETMv3.5 ETRMCR register specification.  See the
 491                          * PMU_FORMAT_ATTR() declarations in
 492                          * drivers/hwtracing/coresight/coresight-perf.c for
 493                          * details.
 494                          */
 495                         config = evsel->core.attr.config;
 496                         break;
 497                 }
 498         }
 499
 500         return config;
 501 }
 502
 503 #ifndef BIT
 504 #define BIT(N) (1UL << (N))
 505 #endif
 506
 507 static u64 cs_etmv4_get_config(struct auxtrace_record *itr)
 508 {
 509         u64 config = 0;
 510         u64 config_opts = 0;
 511
 512         /*
 513          * The perf event variable config bits represent both
 514          * the command line options and register programming
 515          * bits in ETMv3/PTM. For ETMv4 we must remap options
 516          * to real bits
 517          */
 518         config_opts = cs_etm_get_config(itr);
 519         if (config_opts & BIT(ETM_OPT_CYCACC))
 520                 config |= BIT(ETM4_CFG_BIT_CYCACC);
 521         if (config_opts & BIT(ETM_OPT_CTXTID))
 522                 config |= BIT(ETM4_CFG_BIT_CTXTID);
 523         if (config_opts & BIT(ETM_OPT_TS))
 524                 config |= BIT(ETM4_CFG_BIT_TS);
 525         if (config_opts & BIT(ETM_OPT_RETSTK))
 526                 config |= BIT(ETM4_CFG_BIT_RETSTK);
 527         if (config_opts & BIT(ETM_OPT_CTXTID2))
 528                 config |= BIT(ETM4_CFG_BIT_VMID) |
 529                           BIT(ETM4_CFG_BIT_VMID_OPT);
 530         return config;
 531 }
 532
 533 static size_t
 534 cs_etm_info_priv_size(struct auxtrace_record *itr __maybe_unused,
 535                       struct evlist *evlist __maybe_unused)
 536 {
 537         int i;
 538         int etmv3 = 0, etmv4 = 0, ete = 0;
 539         struct perf_cpu_map *event_cpus = evlist->core.cpus;
 540         struct perf_cpu_map *online_cpus = perf_cpu_map__new(NULL);
 541
 542         /* cpu map is not empty, we have specific CPUs to work with */
 543         if (!perf_cpu_map__empty(event_cpus)) {
 544                 for (i = 0; i < cpu__max_cpu(); i++) {
 545                         if (!cpu_map__has(event_cpus, i) ||
 546                             !cpu_map__has(online_cpus, i))
 547                                 continue;
 548
 549                         if (cs_etm_is_ete(itr, i))
 550                                 ete++;
 551                         else if (cs_etm_is_etmv4(itr, i))
 552                                 etmv4++;
 553                         else
 554                                 etmv3++;
 555                 }
 556         } else {
 557                 /* get configuration for all CPUs in the system */
 558                 for (i = 0; i < cpu__max_cpu(); i++) {
 559                         if (!cpu_map__has(online_cpus, i))
 560                                 continue;
 561
 562                         if (cs_etm_is_ete(itr, i))
 563                                 ete++;
 564                         else if (cs_etm_is_etmv4(itr, i))
 565                                 etmv4++;
 566                         else
 567                                 etmv3++;
 568                 }
 569         }
 570
 571         perf_cpu_map__put(online_cpus);
 572
 573         return (CS_ETM_HEADER_SIZE +
 574                (ete   * CS_ETE_PRIV_SIZE) +
 575                (etmv4 * CS_ETMV4_PRIV_SIZE) +
 576                (etmv3 * CS_ETMV3_PRIV_SIZE));
 577 }
 578
 579 static bool cs_etm_is_etmv4(struct auxtrace_record *itr, int cpu)
 580 {
 581         bool ret = false;
 582         char path[PATH_MAX];
 583         int scan;
 584         unsigned int val;
 585         struct cs_etm_recording *ptr =
 586                         container_of(itr, struct cs_etm_recording, itr);
 587         struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
 588
 589         /* Take any of the RO files for ETMv4 and see if it present */
 590         snprintf(path, PATH_MAX, "cpu%d/%s",
 591                  cpu, metadata_etmv4_ro[CS_ETMV4_TRCIDR0]);
 592         scan = perf_pmu__scan_file(cs_etm_pmu, path, "%x", &val);
 593
 594         /* The file was read successfully, we have a winner */
 595         if (scan == 1)
 596                 ret = true;
 597
 598         return ret;
 599 }
 600
 601 static int cs_etm_get_ro(struct perf_pmu *pmu, int cpu, const char *path)
 602 {
 603         char pmu_path[PATH_MAX];
 604         int scan;
 605         unsigned int val = 0;
 606
 607         /* Get RO metadata from sysfs */
 608         snprintf(pmu_path, PATH_MAX, "cpu%d/%s", cpu, path);
 609
 610         scan = perf_pmu__scan_file(pmu, pmu_path, "%x", &val);
 611         if (scan != 1)
 612                 pr_err("%s: error reading: %s\n", __func__, pmu_path);
 613
 614         return val;
 615 }
 616
 617 #define TRCDEVARCH_ARCHPART_SHIFT 0
 618 #define TRCDEVARCH_ARCHPART_MASK  GENMASK(11, 0)
 619 #define TRCDEVARCH_ARCHPART(x)    (((x) & TRCDEVARCH_ARCHPART_MASK) >> TRCDEVARCH_ARCHPART_SHIFT)
 620
 621 #define TRCDEVARCH_ARCHVER_SHIFT 12
 622 #define TRCDEVARCH_ARCHVER_MASK  GENMASK(15, 12)
 623 #define TRCDEVARCH_ARCHVER(x)    (((x) & TRCDEVARCH_ARCHVER_MASK) >> TRCDEVARCH_ARCHVER_SHIFT)
 624
 625 static bool cs_etm_is_ete(struct auxtrace_record *itr, int cpu)
 626 {
 627         struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr);
 628         struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
 629         int trcdevarch = cs_etm_get_ro(cs_etm_pmu, cpu, metadata_etmv4_ro[CS_ETE_TRCDEVARCH]);
 630
 631         /*
 632          * ETE if ARCHVER is 5 (ARCHVER is 4 for ETM) and ARCHPART is 0xA13.
 633          * See ETM_DEVARCH_ETE_ARCH in coresight-etm4x.h
 634          */
 635         return TRCDEVARCH_ARCHVER(trcdevarch) == 5 && TRCDEVARCH_ARCHPART(trcdevarch) == 0xA13;
 636 }
 637
 638 static void cs_etm_save_etmv4_header(__u64 data[], struct auxtrace_record *itr, int cpu)
 639 {
 640         struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr);
 641         struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
 642
 643         /* Get trace configuration register */
 644         data[CS_ETMV4_TRCCONFIGR] = cs_etmv4_get_config(itr);
 645         /* Get traceID from the framework */
 646         data[CS_ETMV4_TRCTRACEIDR] = coresight_get_trace_id(cpu);
 647         /* Get read-only information from sysFS */
 648         data[CS_ETMV4_TRCIDR0] = cs_etm_get_ro(cs_etm_pmu, cpu,
 649                                                metadata_etmv4_ro[CS_ETMV4_TRCIDR0]);
 650         data[CS_ETMV4_TRCIDR1] = cs_etm_get_ro(cs_etm_pmu, cpu,
 651                                                metadata_etmv4_ro[CS_ETMV4_TRCIDR1]);
 652         data[CS_ETMV4_TRCIDR2] = cs_etm_get_ro(cs_etm_pmu, cpu,
 653                                                metadata_etmv4_ro[CS_ETMV4_TRCIDR2]);
 654         data[CS_ETMV4_TRCIDR8] = cs_etm_get_ro(cs_etm_pmu, cpu,
 655                                                metadata_etmv4_ro[CS_ETMV4_TRCIDR8]);
 656         data[CS_ETMV4_TRCAUTHSTATUS] = cs_etm_get_ro(cs_etm_pmu, cpu,
 657                                                      metadata_etmv4_ro[CS_ETMV4_TRCAUTHSTATUS]);
 658 }
 659
 660 static void cs_etm_get_metadata(int cpu, u32 *offset,
 661                                 struct auxtrace_record *itr,
 662                                 struct perf_record_auxtrace_info *info)
 663 {
 664         u32 increment, nr_trc_params;
 665         u64 magic;
 666         struct cs_etm_recording *ptr =
 667                         container_of(itr, struct cs_etm_recording, itr);
 668         struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
 669
 670         /* first see what kind of tracer this cpu is affined to */
 671         if (cs_etm_is_ete(itr, cpu)) {
 672                 magic = __perf_cs_ete_magic;
 673                 /* ETE uses the same registers as ETMv4 plus TRCDEVARCH */
 674                 cs_etm_save_etmv4_header(&info->priv[*offset], itr, cpu);
 675                 info->priv[*offset + CS_ETE_TRCDEVARCH] =
 676                         cs_etm_get_ro(cs_etm_pmu, cpu,
 677                                       metadata_etmv4_ro[CS_ETE_TRCDEVARCH]);
 678
 679                 /* How much space was used */
 680                 increment = CS_ETE_PRIV_MAX;
 681                 nr_trc_params = CS_ETE_PRIV_MAX - CS_ETM_COMMON_BLK_MAX_V1;
 682         } else if (cs_etm_is_etmv4(itr, cpu)) {
 683                 magic = __perf_cs_etmv4_magic;
 684                 cs_etm_save_etmv4_header(&info->priv[*offset], itr, cpu);
 685
 686                 /* How much space was used */
 687                 increment = CS_ETMV4_PRIV_MAX;
 688                 nr_trc_params = CS_ETMV4_PRIV_MAX - CS_ETMV4_TRCCONFIGR;
 689         } else {
 690                 magic = __perf_cs_etmv3_magic;
 691                 /* Get configuration register */
 692                 info->priv[*offset + CS_ETM_ETMCR] = cs_etm_get_config(itr);
 693                 /* Get traceID from the framework */
 694                 info->priv[*offset + CS_ETM_ETMTRACEIDR] =
 695                                                 coresight_get_trace_id(cpu);
 696                 /* Get read-only information from sysFS */
 697                 info->priv[*offset + CS_ETM_ETMCCER] =
 698                         cs_etm_get_ro(cs_etm_pmu, cpu,
 699                                       metadata_etmv3_ro[CS_ETM_ETMCCER]);
 700                 info->priv[*offset + CS_ETM_ETMIDR] =
 701                         cs_etm_get_ro(cs_etm_pmu, cpu,
 702                                       metadata_etmv3_ro[CS_ETM_ETMIDR]);
 703
 704                 /* How much space was used */
 705                 increment = CS_ETM_PRIV_MAX;
 706                 nr_trc_params = CS_ETM_PRIV_MAX - CS_ETM_ETMCR;
 707         }
 708
 709         /* Build generic header portion */
 710         info->priv[*offset + CS_ETM_MAGIC] = magic;
 711         info->priv[*offset + CS_ETM_CPU] = cpu;
 712         info->priv[*offset + CS_ETM_NR_TRC_PARAMS] = nr_trc_params;
 713         /* Where the next CPU entry should start from */
 714         *offset += increment;
 715 }
 716
 717 static int cs_etm_info_fill(struct auxtrace_record *itr,
 718                             struct perf_session *session,
 719                             struct perf_record_auxtrace_info *info,
 720                             size_t priv_size)
 721 {
 722         int i;
 723         u32 offset;
 724         u64 nr_cpu, type;
 725         struct perf_cpu_map *cpu_map;
 726         struct perf_cpu_map *event_cpus = session->evlist->core.cpus;
 727         struct perf_cpu_map *online_cpus = perf_cpu_map__new(NULL);
 728         struct cs_etm_recording *ptr =
 729                         container_of(itr, struct cs_etm_recording, itr);
 730         struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
 731
 732         if (priv_size != cs_etm_info_priv_size(itr, session->evlist))
 733                 return -EINVAL;
 734
 735         if (!session->evlist->core.nr_mmaps)
 736                 return -EINVAL;
 737
 738         /* If the cpu_map is empty all online CPUs are involved */
 739         if (perf_cpu_map__empty(event_cpus)) {
 740                 cpu_map = online_cpus;
 741         } else {
 742                 /* Make sure all specified CPUs are online */
 743                 for (i = 0; i < perf_cpu_map__nr(event_cpus); i++) {
 744                         if (cpu_map__has(event_cpus, i) &&
 745                             !cpu_map__has(online_cpus, i))
 746                                 return -EINVAL;
 747                 }
 748
 749                 cpu_map = event_cpus;
 750         }
 751
 752         nr_cpu = perf_cpu_map__nr(cpu_map);
 753         /* Get PMU type as dynamically assigned by the core */
 754         type = cs_etm_pmu->type;
 755
 756         /* First fill out the session header */
 757         info->type = PERF_AUXTRACE_CS_ETM;
 758         info->priv[CS_HEADER_VERSION] = CS_HEADER_CURRENT_VERSION;
 759         info->priv[CS_PMU_TYPE_CPUS] = type << 32;
 760         info->priv[CS_PMU_TYPE_CPUS] |= nr_cpu;
 761         info->priv[CS_ETM_SNAPSHOT] = ptr->snapshot_mode;
 762
 763         offset = CS_ETM_SNAPSHOT + 1;
 764
 765         for (i = 0; i < cpu__max_cpu() && offset < priv_size; i++)
 766                 if (cpu_map__has(cpu_map, i))
 767                         cs_etm_get_metadata(i, &offset, itr, info);
 768
 769         perf_cpu_map__put(online_cpus);
 770
 771         return 0;
 772 }
 773
 774 static int cs_etm_snapshot_start(struct auxtrace_record *itr)
 775 {
 776         struct cs_etm_recording *ptr =
 777                         container_of(itr, struct cs_etm_recording, itr);
 778         struct evsel *evsel;
 779
 780         evlist__for_each_entry(ptr->evlist, evsel) {
 781                 if (evsel->core.attr.type == ptr->cs_etm_pmu->type)
 782                         return evsel__disable(evsel);
 783         }
 784         return -EINVAL;
 785 }
 786
 787 static int cs_etm_snapshot_finish(struct auxtrace_record *itr)
 788 {
 789         struct cs_etm_recording *ptr =
 790                         container_of(itr, struct cs_etm_recording, itr);
 791         struct evsel *evsel;
 792
 793         evlist__for_each_entry(ptr->evlist, evsel) {
 794                 if (evsel->core.attr.type == ptr->cs_etm_pmu->type)
 795                         return evsel__enable(evsel);
 796         }
 797         return -EINVAL;
 798 }
 799
 800 static u64 cs_etm_reference(struct auxtrace_record *itr __maybe_unused)
 801 {
 802         return (((u64) rand() <<  0) & 0x00000000FFFFFFFFull) |
 803                 (((u64) rand() << 32) & 0xFFFFFFFF00000000ull);
 804 }
 805
 806 static void cs_etm_recording_free(struct auxtrace_record *itr)
 807 {
 808         struct cs_etm_recording *ptr =
 809                         container_of(itr, struct cs_etm_recording, itr);
 810
 811         free(ptr);
 812 }
 813
 814 struct auxtrace_record *cs_etm_record_init(int *err)
 815 {
 816         struct perf_pmu *cs_etm_pmu;
 817         struct cs_etm_recording *ptr;
 818
 819         cs_etm_pmu = perf_pmu__find(CORESIGHT_ETM_PMU_NAME);
 820
 821         if (!cs_etm_pmu) {
 822                 *err = -EINVAL;
 823                 goto out;
 824         }
 825
 826         ptr = zalloc(sizeof(struct cs_etm_recording));
 827         if (!ptr) {
 828                 *err = -ENOMEM;
 829                 goto out;
 830         }
 831
 832         ptr->cs_etm_pmu                 = cs_etm_pmu;
 833         ptr->itr.pmu                    = cs_etm_pmu;
 834         ptr->itr.parse_snapshot_options = cs_etm_parse_snapshot_options;
 835         ptr->itr.recording_options      = cs_etm_recording_options;
 836         ptr->itr.info_priv_size         = cs_etm_info_priv_size;
 837         ptr->itr.info_fill              = cs_etm_info_fill;
 838         ptr->itr.snapshot_start         = cs_etm_snapshot_start;
 839         ptr->itr.snapshot_finish        = cs_etm_snapshot_finish;
 840         ptr->itr.reference              = cs_etm_reference;
 841         ptr->itr.free                   = cs_etm_recording_free;
 842         ptr->itr.read_finish            = auxtrace_record__read_finish;
 843
 844         *err = 0;
 845         return &ptr->itr;
 846 out:
 847         return NULL;
 848 }