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/pmus.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_ETMV4_TS_SOURCE] = "ts_source", 57 }; 58 59 static const char * const metadata_ete_ro[] = { 60 [CS_ETE_TRCIDR0] = "trcidr/trcidr0", 61 [CS_ETE_TRCIDR1] = "trcidr/trcidr1", 62 [CS_ETE_TRCIDR2] = "trcidr/trcidr2", 63 [CS_ETE_TRCIDR8] = "trcidr/trcidr8", 64 [CS_ETE_TRCAUTHSTATUS] = "mgmt/trcauthstatus", 65 [CS_ETE_TRCDEVARCH] = "mgmt/trcdevarch", 66 [CS_ETE_TS_SOURCE] = "ts_source", 67 }; 68 69 static bool cs_etm_is_etmv4(struct auxtrace_record *itr, int cpu); 70 static bool cs_etm_is_ete(struct auxtrace_record *itr, int cpu); 71 72 static int cs_etm_validate_context_id(struct auxtrace_record *itr, 73 struct evsel *evsel, int cpu) 74 { 75 struct cs_etm_recording *ptr = 76 container_of(itr, struct cs_etm_recording, itr); 77 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; 78 char path[PATH_MAX]; 79 int err; 80 u32 val; 81 u64 contextid = evsel->core.attr.config & 82 (perf_pmu__format_bits(cs_etm_pmu, "contextid") | 83 perf_pmu__format_bits(cs_etm_pmu, "contextid1") | 84 perf_pmu__format_bits(cs_etm_pmu, "contextid2")); 85 86 if (!contextid) 87 return 0; 88 89 /* Not supported in etmv3 */ 90 if (!cs_etm_is_etmv4(itr, cpu)) { 91 pr_err("%s: contextid not supported in ETMv3, disable with %s/contextid=0/\n", 92 CORESIGHT_ETM_PMU_NAME, CORESIGHT_ETM_PMU_NAME); 93 return -EINVAL; 94 } 95 96 /* Get a handle on TRCIDR2 */ 97 snprintf(path, PATH_MAX, "cpu%d/%s", 98 cpu, metadata_etmv4_ro[CS_ETMV4_TRCIDR2]); 99 err = perf_pmu__scan_file(cs_etm_pmu, path, "%x", &val); 100 101 /* There was a problem reading the file, bailing out */ 102 if (err != 1) { 103 pr_err("%s: can't read file %s\n", CORESIGHT_ETM_PMU_NAME, 104 path); 105 return err; 106 } 107 108 if (contextid & 109 perf_pmu__format_bits(cs_etm_pmu, "contextid1")) { 110 /* 111 * TRCIDR2.CIDSIZE, bit [9-5], indicates whether contextID 112 * tracing is supported: 113 * 0b00000 Context ID tracing is not supported. 114 * 0b00100 Maximum of 32-bit Context ID size. 115 * All other values are reserved. 116 */ 117 if (BMVAL(val, 5, 9) != 0x4) { 118 pr_err("%s: CONTEXTIDR_EL1 isn't supported, disable with %s/contextid1=0/\n", 119 CORESIGHT_ETM_PMU_NAME, CORESIGHT_ETM_PMU_NAME); 120 return -EINVAL; 121 } 122 } 123 124 if (contextid & 125 perf_pmu__format_bits(cs_etm_pmu, "contextid2")) { 126 /* 127 * TRCIDR2.VMIDOPT[30:29] != 0 and 128 * TRCIDR2.VMIDSIZE[14:10] == 0b00100 (32bit virtual contextid) 129 * We can't support CONTEXTIDR in VMID if the size of the 130 * virtual context id is < 32bit. 131 * Any value of VMIDSIZE >= 4 (i.e, > 32bit) is fine for us. 132 */ 133 if (!BMVAL(val, 29, 30) || BMVAL(val, 10, 14) < 4) { 134 pr_err("%s: CONTEXTIDR_EL2 isn't supported, disable with %s/contextid2=0/\n", 135 CORESIGHT_ETM_PMU_NAME, CORESIGHT_ETM_PMU_NAME); 136 return -EINVAL; 137 } 138 } 139 140 return 0; 141 } 142 143 static int cs_etm_validate_timestamp(struct auxtrace_record *itr, 144 struct evsel *evsel, int cpu) 145 { 146 struct cs_etm_recording *ptr = 147 container_of(itr, struct cs_etm_recording, itr); 148 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; 149 char path[PATH_MAX]; 150 int err; 151 u32 val; 152 153 if (!(evsel->core.attr.config & 154 perf_pmu__format_bits(cs_etm_pmu, "timestamp"))) 155 return 0; 156 157 if (!cs_etm_is_etmv4(itr, cpu)) { 158 pr_err("%s: timestamp not supported in ETMv3, disable with %s/timestamp=0/\n", 159 CORESIGHT_ETM_PMU_NAME, CORESIGHT_ETM_PMU_NAME); 160 return -EINVAL; 161 } 162 163 /* Get a handle on TRCIRD0 */ 164 snprintf(path, PATH_MAX, "cpu%d/%s", 165 cpu, metadata_etmv4_ro[CS_ETMV4_TRCIDR0]); 166 err = perf_pmu__scan_file(cs_etm_pmu, path, "%x", &val); 167 168 /* There was a problem reading the file, bailing out */ 169 if (err != 1) { 170 pr_err("%s: can't read file %s\n", 171 CORESIGHT_ETM_PMU_NAME, path); 172 return err; 173 } 174 175 /* 176 * TRCIDR0.TSSIZE, bit [28-24], indicates whether global timestamping 177 * is supported: 178 * 0b00000 Global timestamping is not implemented 179 * 0b00110 Implementation supports a maximum timestamp of 48bits. 180 * 0b01000 Implementation supports a maximum timestamp of 64bits. 181 */ 182 val &= GENMASK(28, 24); 183 if (!val) { 184 return -EINVAL; 185 } 186 187 return 0; 188 } 189 190 /* 191 * Check whether the requested timestamp and contextid options should be 192 * available on all requested CPUs and if not, tell the user how to override. 193 * The kernel will silently disable any unavailable options so a warning here 194 * first is better. In theory the kernel could still disable the option for 195 * some other reason so this is best effort only. 196 */ 197 static int cs_etm_validate_config(struct auxtrace_record *itr, 198 struct evsel *evsel) 199 { 200 int i, err = -EINVAL; 201 struct perf_cpu_map *event_cpus = evsel->evlist->core.user_requested_cpus; 202 struct perf_cpu_map *online_cpus = perf_cpu_map__new(NULL); 203 204 /* Set option of each CPU we have */ 205 for (i = 0; i < cpu__max_cpu().cpu; i++) { 206 struct perf_cpu cpu = { .cpu = i, }; 207 208 /* 209 * In per-cpu case, do the validation for CPUs to work with. 210 * In per-thread case, the CPU map is empty. Since the traced 211 * program can run on any CPUs in this case, thus don't skip 212 * validation. 213 */ 214 if (!perf_cpu_map__empty(event_cpus) && 215 !perf_cpu_map__has(event_cpus, cpu)) 216 continue; 217 218 if (!perf_cpu_map__has(online_cpus, cpu)) 219 continue; 220 221 err = cs_etm_validate_context_id(itr, evsel, i); 222 if (err) 223 goto out; 224 err = cs_etm_validate_timestamp(itr, evsel, i); 225 if (err) 226 goto out; 227 } 228 229 err = 0; 230 out: 231 perf_cpu_map__put(online_cpus); 232 return err; 233 } 234 235 static int cs_etm_parse_snapshot_options(struct auxtrace_record *itr, 236 struct record_opts *opts, 237 const char *str) 238 { 239 struct cs_etm_recording *ptr = 240 container_of(itr, struct cs_etm_recording, itr); 241 unsigned long long snapshot_size = 0; 242 char *endptr; 243 244 if (str) { 245 snapshot_size = strtoull(str, &endptr, 0); 246 if (*endptr || snapshot_size > SIZE_MAX) 247 return -1; 248 } 249 250 opts->auxtrace_snapshot_mode = true; 251 opts->auxtrace_snapshot_size = snapshot_size; 252 ptr->snapshot_size = snapshot_size; 253 254 return 0; 255 } 256 257 static int cs_etm_set_sink_attr(struct perf_pmu *pmu, 258 struct evsel *evsel) 259 { 260 char msg[BUFSIZ], path[PATH_MAX], *sink; 261 struct evsel_config_term *term; 262 int ret = -EINVAL; 263 u32 hash; 264 265 if (evsel->core.attr.config2 & GENMASK(31, 0)) 266 return 0; 267 268 list_for_each_entry(term, &evsel->config_terms, list) { 269 if (term->type != EVSEL__CONFIG_TERM_DRV_CFG) 270 continue; 271 272 sink = term->val.str; 273 snprintf(path, PATH_MAX, "sinks/%s", sink); 274 275 ret = perf_pmu__scan_file(pmu, path, "%x", &hash); 276 if (ret != 1) { 277 if (errno == ENOENT) 278 pr_err("Couldn't find sink \"%s\" on event %s\n" 279 "Missing kernel or device support?\n\n" 280 "Hint: An appropriate sink will be picked automatically if one isn't specified.\n", 281 sink, evsel__name(evsel)); 282 else 283 pr_err("Failed to set sink \"%s\" on event %s with %d (%s)\n", 284 sink, evsel__name(evsel), errno, 285 str_error_r(errno, msg, sizeof(msg))); 286 return ret; 287 } 288 289 evsel->core.attr.config2 |= hash; 290 return 0; 291 } 292 293 /* 294 * No sink was provided on the command line - allow the CoreSight 295 * system to look for a default 296 */ 297 return 0; 298 } 299 300 static int cs_etm_recording_options(struct auxtrace_record *itr, 301 struct evlist *evlist, 302 struct record_opts *opts) 303 { 304 int ret; 305 struct cs_etm_recording *ptr = 306 container_of(itr, struct cs_etm_recording, itr); 307 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; 308 struct evsel *evsel, *cs_etm_evsel = NULL; 309 struct perf_cpu_map *cpus = evlist->core.user_requested_cpus; 310 bool privileged = perf_event_paranoid_check(-1); 311 int err = 0; 312 313 evlist__for_each_entry(evlist, evsel) { 314 if (evsel->core.attr.type == cs_etm_pmu->type) { 315 if (cs_etm_evsel) { 316 pr_err("There may be only one %s event\n", 317 CORESIGHT_ETM_PMU_NAME); 318 return -EINVAL; 319 } 320 cs_etm_evsel = evsel; 321 } 322 } 323 324 /* no need to continue if at least one event of interest was found */ 325 if (!cs_etm_evsel) 326 return 0; 327 328 ptr->evlist = evlist; 329 ptr->snapshot_mode = opts->auxtrace_snapshot_mode; 330 331 if (!record_opts__no_switch_events(opts) && 332 perf_can_record_switch_events()) 333 opts->record_switch_events = true; 334 335 cs_etm_evsel->needs_auxtrace_mmap = true; 336 opts->full_auxtrace = true; 337 338 ret = cs_etm_set_sink_attr(cs_etm_pmu, cs_etm_evsel); 339 if (ret) 340 return ret; 341 342 if (opts->use_clockid) { 343 pr_err("Cannot use clockid (-k option) with %s\n", 344 CORESIGHT_ETM_PMU_NAME); 345 return -EINVAL; 346 } 347 348 /* we are in snapshot mode */ 349 if (opts->auxtrace_snapshot_mode) { 350 /* 351 * No size were given to '-S' or '-m,', so go with 352 * the default 353 */ 354 if (!opts->auxtrace_snapshot_size && 355 !opts->auxtrace_mmap_pages) { 356 if (privileged) { 357 opts->auxtrace_mmap_pages = MiB(4) / page_size; 358 } else { 359 opts->auxtrace_mmap_pages = 360 KiB(128) / page_size; 361 if (opts->mmap_pages == UINT_MAX) 362 opts->mmap_pages = KiB(256) / page_size; 363 } 364 } else if (!opts->auxtrace_mmap_pages && !privileged && 365 opts->mmap_pages == UINT_MAX) { 366 opts->mmap_pages = KiB(256) / page_size; 367 } 368 369 /* 370 * '-m,xyz' was specified but no snapshot size, so make the 371 * snapshot size as big as the auxtrace mmap area. 372 */ 373 if (!opts->auxtrace_snapshot_size) { 374 opts->auxtrace_snapshot_size = 375 opts->auxtrace_mmap_pages * (size_t)page_size; 376 } 377 378 /* 379 * -Sxyz was specified but no auxtrace mmap area, so make the 380 * auxtrace mmap area big enough to fit the requested snapshot 381 * size. 382 */ 383 if (!opts->auxtrace_mmap_pages) { 384 size_t sz = opts->auxtrace_snapshot_size; 385 386 sz = round_up(sz, page_size) / page_size; 387 opts->auxtrace_mmap_pages = roundup_pow_of_two(sz); 388 } 389 390 /* Snapshot size can't be bigger than the auxtrace area */ 391 if (opts->auxtrace_snapshot_size > 392 opts->auxtrace_mmap_pages * (size_t)page_size) { 393 pr_err("Snapshot size %zu must not be greater than AUX area tracing mmap size %zu\n", 394 opts->auxtrace_snapshot_size, 395 opts->auxtrace_mmap_pages * (size_t)page_size); 396 return -EINVAL; 397 } 398 399 /* Something went wrong somewhere - this shouldn't happen */ 400 if (!opts->auxtrace_snapshot_size || 401 !opts->auxtrace_mmap_pages) { 402 pr_err("Failed to calculate default snapshot size and/or AUX area tracing mmap pages\n"); 403 return -EINVAL; 404 } 405 } 406 407 /* Buffer sizes weren't specified with '-m,xyz' so give some defaults */ 408 if (!opts->auxtrace_mmap_pages) { 409 if (privileged) { 410 opts->auxtrace_mmap_pages = MiB(4) / page_size; 411 } else { 412 opts->auxtrace_mmap_pages = KiB(128) / page_size; 413 if (opts->mmap_pages == UINT_MAX) 414 opts->mmap_pages = KiB(256) / page_size; 415 } 416 } 417 418 if (opts->auxtrace_snapshot_mode) 419 pr_debug2("%s snapshot size: %zu\n", CORESIGHT_ETM_PMU_NAME, 420 opts->auxtrace_snapshot_size); 421 422 /* 423 * To obtain the auxtrace buffer file descriptor, the auxtrace 424 * event must come first. 425 */ 426 evlist__to_front(evlist, cs_etm_evsel); 427 428 /* 429 * get the CPU on the sample - need it to associate trace ID in the 430 * AUX_OUTPUT_HW_ID event, and the AUX event for per-cpu mmaps. 431 */ 432 evsel__set_sample_bit(cs_etm_evsel, CPU); 433 434 /* 435 * Also the case of per-cpu mmaps, need the contextID in order to be notified 436 * when a context switch happened. 437 */ 438 if (!perf_cpu_map__empty(cpus)) { 439 evsel__set_config_if_unset(cs_etm_pmu, cs_etm_evsel, 440 "timestamp", 1); 441 evsel__set_config_if_unset(cs_etm_pmu, cs_etm_evsel, 442 "contextid", 1); 443 } 444 445 /* 446 * When the option '--timestamp' or '-T' is enabled, the PERF_SAMPLE_TIME 447 * bit is set for all events. In this case, always enable Arm CoreSight 448 * timestamp tracing. 449 */ 450 if (opts->sample_time_set) 451 evsel__set_config_if_unset(cs_etm_pmu, cs_etm_evsel, 452 "timestamp", 1); 453 454 /* Add dummy event to keep tracking */ 455 err = parse_event(evlist, "dummy:u"); 456 if (err) 457 goto out; 458 evsel = evlist__last(evlist); 459 evlist__set_tracking_event(evlist, evsel); 460 evsel->core.attr.freq = 0; 461 evsel->core.attr.sample_period = 1; 462 463 /* In per-cpu case, always need the time of mmap events etc */ 464 if (!perf_cpu_map__empty(cpus)) 465 evsel__set_sample_bit(evsel, TIME); 466 467 err = cs_etm_validate_config(itr, cs_etm_evsel); 468 out: 469 return err; 470 } 471 472 static u64 cs_etm_get_config(struct auxtrace_record *itr) 473 { 474 u64 config = 0; 475 struct cs_etm_recording *ptr = 476 container_of(itr, struct cs_etm_recording, itr); 477 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; 478 struct evlist *evlist = ptr->evlist; 479 struct evsel *evsel; 480 481 evlist__for_each_entry(evlist, evsel) { 482 if (evsel->core.attr.type == cs_etm_pmu->type) { 483 /* 484 * Variable perf_event_attr::config is assigned to 485 * ETMv3/PTM. The bit fields have been made to match 486 * the ETMv3.5 ETRMCR register specification. See the 487 * PMU_FORMAT_ATTR() declarations in 488 * drivers/hwtracing/coresight/coresight-perf.c for 489 * details. 490 */ 491 config = evsel->core.attr.config; 492 break; 493 } 494 } 495 496 return config; 497 } 498 499 #ifndef BIT 500 #define BIT(N) (1UL << (N)) 501 #endif 502 503 static u64 cs_etmv4_get_config(struct auxtrace_record *itr) 504 { 505 u64 config = 0; 506 u64 config_opts = 0; 507 508 /* 509 * The perf event variable config bits represent both 510 * the command line options and register programming 511 * bits in ETMv3/PTM. For ETMv4 we must remap options 512 * to real bits 513 */ 514 config_opts = cs_etm_get_config(itr); 515 if (config_opts & BIT(ETM_OPT_CYCACC)) 516 config |= BIT(ETM4_CFG_BIT_CYCACC); 517 if (config_opts & BIT(ETM_OPT_CTXTID)) 518 config |= BIT(ETM4_CFG_BIT_CTXTID); 519 if (config_opts & BIT(ETM_OPT_TS)) 520 config |= BIT(ETM4_CFG_BIT_TS); 521 if (config_opts & BIT(ETM_OPT_RETSTK)) 522 config |= BIT(ETM4_CFG_BIT_RETSTK); 523 if (config_opts & BIT(ETM_OPT_CTXTID2)) 524 config |= BIT(ETM4_CFG_BIT_VMID) | 525 BIT(ETM4_CFG_BIT_VMID_OPT); 526 if (config_opts & BIT(ETM_OPT_BRANCH_BROADCAST)) 527 config |= BIT(ETM4_CFG_BIT_BB); 528 529 return config; 530 } 531 532 static size_t 533 cs_etm_info_priv_size(struct auxtrace_record *itr __maybe_unused, 534 struct evlist *evlist __maybe_unused) 535 { 536 int i; 537 int etmv3 = 0, etmv4 = 0, ete = 0; 538 struct perf_cpu_map *event_cpus = evlist->core.user_requested_cpus; 539 struct perf_cpu_map *online_cpus = perf_cpu_map__new(NULL); 540 541 /* cpu map is not empty, we have specific CPUs to work with */ 542 if (!perf_cpu_map__empty(event_cpus)) { 543 for (i = 0; i < cpu__max_cpu().cpu; i++) { 544 struct perf_cpu cpu = { .cpu = i, }; 545 546 if (!perf_cpu_map__has(event_cpus, cpu) || 547 !perf_cpu_map__has(online_cpus, cpu)) 548 continue; 549 550 if (cs_etm_is_ete(itr, i)) 551 ete++; 552 else if (cs_etm_is_etmv4(itr, i)) 553 etmv4++; 554 else 555 etmv3++; 556 } 557 } else { 558 /* get configuration for all CPUs in the system */ 559 for (i = 0; i < cpu__max_cpu().cpu; i++) { 560 struct perf_cpu cpu = { .cpu = i, }; 561 562 if (!perf_cpu_map__has(online_cpus, cpu)) 563 continue; 564 565 if (cs_etm_is_ete(itr, i)) 566 ete++; 567 else if (cs_etm_is_etmv4(itr, i)) 568 etmv4++; 569 else 570 etmv3++; 571 } 572 } 573 574 perf_cpu_map__put(online_cpus); 575 576 return (CS_ETM_HEADER_SIZE + 577 (ete * CS_ETE_PRIV_SIZE) + 578 (etmv4 * CS_ETMV4_PRIV_SIZE) + 579 (etmv3 * CS_ETMV3_PRIV_SIZE)); 580 } 581 582 static bool cs_etm_is_etmv4(struct auxtrace_record *itr, int cpu) 583 { 584 bool ret = false; 585 char path[PATH_MAX]; 586 int scan; 587 unsigned int val; 588 struct cs_etm_recording *ptr = 589 container_of(itr, struct cs_etm_recording, itr); 590 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; 591 592 /* Take any of the RO files for ETMv4 and see if it present */ 593 snprintf(path, PATH_MAX, "cpu%d/%s", 594 cpu, metadata_etmv4_ro[CS_ETMV4_TRCIDR0]); 595 scan = perf_pmu__scan_file(cs_etm_pmu, path, "%x", &val); 596 597 /* The file was read successfully, we have a winner */ 598 if (scan == 1) 599 ret = true; 600 601 return ret; 602 } 603 604 static int cs_etm_get_ro(struct perf_pmu *pmu, int cpu, const char *path) 605 { 606 char pmu_path[PATH_MAX]; 607 int scan; 608 unsigned int val = 0; 609 610 /* Get RO metadata from sysfs */ 611 snprintf(pmu_path, PATH_MAX, "cpu%d/%s", cpu, path); 612 613 scan = perf_pmu__scan_file(pmu, pmu_path, "%x", &val); 614 if (scan != 1) 615 pr_err("%s: error reading: %s\n", __func__, pmu_path); 616 617 return val; 618 } 619 620 static int cs_etm_get_ro_signed(struct perf_pmu *pmu, int cpu, const char *path) 621 { 622 char pmu_path[PATH_MAX]; 623 int scan; 624 int val = 0; 625 626 /* Get RO metadata from sysfs */ 627 snprintf(pmu_path, PATH_MAX, "cpu%d/%s", cpu, path); 628 629 scan = perf_pmu__scan_file(pmu, pmu_path, "%d", &val); 630 if (scan != 1) 631 pr_err("%s: error reading: %s\n", __func__, pmu_path); 632 633 return val; 634 } 635 636 static bool cs_etm_pmu_path_exists(struct perf_pmu *pmu, int cpu, const char *path) 637 { 638 char pmu_path[PATH_MAX]; 639 640 /* Get RO metadata from sysfs */ 641 snprintf(pmu_path, PATH_MAX, "cpu%d/%s", cpu, path); 642 643 return perf_pmu__file_exists(pmu, pmu_path); 644 } 645 646 #define TRCDEVARCH_ARCHPART_SHIFT 0 647 #define TRCDEVARCH_ARCHPART_MASK GENMASK(11, 0) 648 #define TRCDEVARCH_ARCHPART(x) (((x) & TRCDEVARCH_ARCHPART_MASK) >> TRCDEVARCH_ARCHPART_SHIFT) 649 650 #define TRCDEVARCH_ARCHVER_SHIFT 12 651 #define TRCDEVARCH_ARCHVER_MASK GENMASK(15, 12) 652 #define TRCDEVARCH_ARCHVER(x) (((x) & TRCDEVARCH_ARCHVER_MASK) >> TRCDEVARCH_ARCHVER_SHIFT) 653 654 static bool cs_etm_is_ete(struct auxtrace_record *itr, int cpu) 655 { 656 struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr); 657 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; 658 int trcdevarch; 659 660 if (!cs_etm_pmu_path_exists(cs_etm_pmu, cpu, metadata_ete_ro[CS_ETE_TRCDEVARCH])) 661 return false; 662 663 trcdevarch = cs_etm_get_ro(cs_etm_pmu, cpu, metadata_ete_ro[CS_ETE_TRCDEVARCH]); 664 /* 665 * ETE if ARCHVER is 5 (ARCHVER is 4 for ETM) and ARCHPART is 0xA13. 666 * See ETM_DEVARCH_ETE_ARCH in coresight-etm4x.h 667 */ 668 return TRCDEVARCH_ARCHVER(trcdevarch) == 5 && TRCDEVARCH_ARCHPART(trcdevarch) == 0xA13; 669 } 670 671 static void cs_etm_save_etmv4_header(__u64 data[], struct auxtrace_record *itr, int cpu) 672 { 673 struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr); 674 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; 675 676 /* Get trace configuration register */ 677 data[CS_ETMV4_TRCCONFIGR] = cs_etmv4_get_config(itr); 678 /* traceID set to legacy version, in case new perf running on older system */ 679 data[CS_ETMV4_TRCTRACEIDR] = 680 CORESIGHT_LEGACY_CPU_TRACE_ID(cpu) | CORESIGHT_TRACE_ID_UNUSED_FLAG; 681 682 /* Get read-only information from sysFS */ 683 data[CS_ETMV4_TRCIDR0] = cs_etm_get_ro(cs_etm_pmu, cpu, 684 metadata_etmv4_ro[CS_ETMV4_TRCIDR0]); 685 data[CS_ETMV4_TRCIDR1] = cs_etm_get_ro(cs_etm_pmu, cpu, 686 metadata_etmv4_ro[CS_ETMV4_TRCIDR1]); 687 data[CS_ETMV4_TRCIDR2] = cs_etm_get_ro(cs_etm_pmu, cpu, 688 metadata_etmv4_ro[CS_ETMV4_TRCIDR2]); 689 data[CS_ETMV4_TRCIDR8] = cs_etm_get_ro(cs_etm_pmu, cpu, 690 metadata_etmv4_ro[CS_ETMV4_TRCIDR8]); 691 data[CS_ETMV4_TRCAUTHSTATUS] = cs_etm_get_ro(cs_etm_pmu, cpu, 692 metadata_etmv4_ro[CS_ETMV4_TRCAUTHSTATUS]); 693 694 /* Kernels older than 5.19 may not expose ts_source */ 695 if (cs_etm_pmu_path_exists(cs_etm_pmu, cpu, metadata_etmv4_ro[CS_ETMV4_TS_SOURCE])) 696 data[CS_ETMV4_TS_SOURCE] = (__u64) cs_etm_get_ro_signed(cs_etm_pmu, cpu, 697 metadata_etmv4_ro[CS_ETMV4_TS_SOURCE]); 698 else { 699 pr_debug3("[%03d] pmu file 'ts_source' not found. Fallback to safe value (-1)\n", 700 cpu); 701 data[CS_ETMV4_TS_SOURCE] = (__u64) -1; 702 } 703 } 704 705 static void cs_etm_save_ete_header(__u64 data[], struct auxtrace_record *itr, int cpu) 706 { 707 struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr); 708 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; 709 710 /* Get trace configuration register */ 711 data[CS_ETE_TRCCONFIGR] = cs_etmv4_get_config(itr); 712 /* traceID set to legacy version, in case new perf running on older system */ 713 data[CS_ETE_TRCTRACEIDR] = 714 CORESIGHT_LEGACY_CPU_TRACE_ID(cpu) | CORESIGHT_TRACE_ID_UNUSED_FLAG; 715 716 /* Get read-only information from sysFS */ 717 data[CS_ETE_TRCIDR0] = cs_etm_get_ro(cs_etm_pmu, cpu, 718 metadata_ete_ro[CS_ETE_TRCIDR0]); 719 data[CS_ETE_TRCIDR1] = cs_etm_get_ro(cs_etm_pmu, cpu, 720 metadata_ete_ro[CS_ETE_TRCIDR1]); 721 data[CS_ETE_TRCIDR2] = cs_etm_get_ro(cs_etm_pmu, cpu, 722 metadata_ete_ro[CS_ETE_TRCIDR2]); 723 data[CS_ETE_TRCIDR8] = cs_etm_get_ro(cs_etm_pmu, cpu, 724 metadata_ete_ro[CS_ETE_TRCIDR8]); 725 data[CS_ETE_TRCAUTHSTATUS] = cs_etm_get_ro(cs_etm_pmu, cpu, 726 metadata_ete_ro[CS_ETE_TRCAUTHSTATUS]); 727 /* ETE uses the same registers as ETMv4 plus TRCDEVARCH */ 728 data[CS_ETE_TRCDEVARCH] = cs_etm_get_ro(cs_etm_pmu, cpu, 729 metadata_ete_ro[CS_ETE_TRCDEVARCH]); 730 731 /* Kernels older than 5.19 may not expose ts_source */ 732 if (cs_etm_pmu_path_exists(cs_etm_pmu, cpu, metadata_ete_ro[CS_ETE_TS_SOURCE])) 733 data[CS_ETE_TS_SOURCE] = (__u64) cs_etm_get_ro_signed(cs_etm_pmu, cpu, 734 metadata_ete_ro[CS_ETE_TS_SOURCE]); 735 else { 736 pr_debug3("[%03d] pmu file 'ts_source' not found. Fallback to safe value (-1)\n", 737 cpu); 738 data[CS_ETE_TS_SOURCE] = (__u64) -1; 739 } 740 } 741 742 static void cs_etm_get_metadata(int cpu, u32 *offset, 743 struct auxtrace_record *itr, 744 struct perf_record_auxtrace_info *info) 745 { 746 u32 increment, nr_trc_params; 747 u64 magic; 748 struct cs_etm_recording *ptr = 749 container_of(itr, struct cs_etm_recording, itr); 750 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; 751 752 /* first see what kind of tracer this cpu is affined to */ 753 if (cs_etm_is_ete(itr, cpu)) { 754 magic = __perf_cs_ete_magic; 755 cs_etm_save_ete_header(&info->priv[*offset], itr, cpu); 756 757 /* How much space was used */ 758 increment = CS_ETE_PRIV_MAX; 759 nr_trc_params = CS_ETE_PRIV_MAX - CS_ETM_COMMON_BLK_MAX_V1; 760 } else if (cs_etm_is_etmv4(itr, cpu)) { 761 magic = __perf_cs_etmv4_magic; 762 cs_etm_save_etmv4_header(&info->priv[*offset], itr, cpu); 763 764 /* How much space was used */ 765 increment = CS_ETMV4_PRIV_MAX; 766 nr_trc_params = CS_ETMV4_PRIV_MAX - CS_ETMV4_TRCCONFIGR; 767 } else { 768 magic = __perf_cs_etmv3_magic; 769 /* Get configuration register */ 770 info->priv[*offset + CS_ETM_ETMCR] = cs_etm_get_config(itr); 771 /* traceID set to legacy value in case new perf running on old system */ 772 info->priv[*offset + CS_ETM_ETMTRACEIDR] = 773 CORESIGHT_LEGACY_CPU_TRACE_ID(cpu) | CORESIGHT_TRACE_ID_UNUSED_FLAG; 774 /* Get read-only information from sysFS */ 775 info->priv[*offset + CS_ETM_ETMCCER] = 776 cs_etm_get_ro(cs_etm_pmu, cpu, 777 metadata_etmv3_ro[CS_ETM_ETMCCER]); 778 info->priv[*offset + CS_ETM_ETMIDR] = 779 cs_etm_get_ro(cs_etm_pmu, cpu, 780 metadata_etmv3_ro[CS_ETM_ETMIDR]); 781 782 /* How much space was used */ 783 increment = CS_ETM_PRIV_MAX; 784 nr_trc_params = CS_ETM_PRIV_MAX - CS_ETM_ETMCR; 785 } 786 787 /* Build generic header portion */ 788 info->priv[*offset + CS_ETM_MAGIC] = magic; 789 info->priv[*offset + CS_ETM_CPU] = cpu; 790 info->priv[*offset + CS_ETM_NR_TRC_PARAMS] = nr_trc_params; 791 /* Where the next CPU entry should start from */ 792 *offset += increment; 793 } 794 795 static int cs_etm_info_fill(struct auxtrace_record *itr, 796 struct perf_session *session, 797 struct perf_record_auxtrace_info *info, 798 size_t priv_size) 799 { 800 int i; 801 u32 offset; 802 u64 nr_cpu, type; 803 struct perf_cpu_map *cpu_map; 804 struct perf_cpu_map *event_cpus = session->evlist->core.user_requested_cpus; 805 struct perf_cpu_map *online_cpus = perf_cpu_map__new(NULL); 806 struct cs_etm_recording *ptr = 807 container_of(itr, struct cs_etm_recording, itr); 808 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; 809 810 if (priv_size != cs_etm_info_priv_size(itr, session->evlist)) 811 return -EINVAL; 812 813 if (!session->evlist->core.nr_mmaps) 814 return -EINVAL; 815 816 /* If the cpu_map is empty all online CPUs are involved */ 817 if (perf_cpu_map__empty(event_cpus)) { 818 cpu_map = online_cpus; 819 } else { 820 /* Make sure all specified CPUs are online */ 821 for (i = 0; i < perf_cpu_map__nr(event_cpus); i++) { 822 struct perf_cpu cpu = { .cpu = i, }; 823 824 if (perf_cpu_map__has(event_cpus, cpu) && 825 !perf_cpu_map__has(online_cpus, cpu)) 826 return -EINVAL; 827 } 828 829 cpu_map = event_cpus; 830 } 831 832 nr_cpu = perf_cpu_map__nr(cpu_map); 833 /* Get PMU type as dynamically assigned by the core */ 834 type = cs_etm_pmu->type; 835 836 /* First fill out the session header */ 837 info->type = PERF_AUXTRACE_CS_ETM; 838 info->priv[CS_HEADER_VERSION] = CS_HEADER_CURRENT_VERSION; 839 info->priv[CS_PMU_TYPE_CPUS] = type << 32; 840 info->priv[CS_PMU_TYPE_CPUS] |= nr_cpu; 841 info->priv[CS_ETM_SNAPSHOT] = ptr->snapshot_mode; 842 843 offset = CS_ETM_SNAPSHOT + 1; 844 845 for (i = 0; i < cpu__max_cpu().cpu && offset < priv_size; i++) { 846 struct perf_cpu cpu = { .cpu = i, }; 847 848 if (perf_cpu_map__has(cpu_map, cpu)) 849 cs_etm_get_metadata(i, &offset, itr, info); 850 } 851 852 perf_cpu_map__put(online_cpus); 853 854 return 0; 855 } 856 857 static int cs_etm_snapshot_start(struct auxtrace_record *itr) 858 { 859 struct cs_etm_recording *ptr = 860 container_of(itr, struct cs_etm_recording, itr); 861 struct evsel *evsel; 862 863 evlist__for_each_entry(ptr->evlist, evsel) { 864 if (evsel->core.attr.type == ptr->cs_etm_pmu->type) 865 return evsel__disable(evsel); 866 } 867 return -EINVAL; 868 } 869 870 static int cs_etm_snapshot_finish(struct auxtrace_record *itr) 871 { 872 struct cs_etm_recording *ptr = 873 container_of(itr, struct cs_etm_recording, itr); 874 struct evsel *evsel; 875 876 evlist__for_each_entry(ptr->evlist, evsel) { 877 if (evsel->core.attr.type == ptr->cs_etm_pmu->type) 878 return evsel__enable(evsel); 879 } 880 return -EINVAL; 881 } 882 883 static u64 cs_etm_reference(struct auxtrace_record *itr __maybe_unused) 884 { 885 return (((u64) rand() << 0) & 0x00000000FFFFFFFFull) | 886 (((u64) rand() << 32) & 0xFFFFFFFF00000000ull); 887 } 888 889 static void cs_etm_recording_free(struct auxtrace_record *itr) 890 { 891 struct cs_etm_recording *ptr = 892 container_of(itr, struct cs_etm_recording, itr); 893 894 free(ptr); 895 } 896 897 struct auxtrace_record *cs_etm_record_init(int *err) 898 { 899 struct perf_pmu *cs_etm_pmu; 900 struct cs_etm_recording *ptr; 901 902 cs_etm_pmu = perf_pmus__find(CORESIGHT_ETM_PMU_NAME); 903 904 if (!cs_etm_pmu) { 905 *err = -EINVAL; 906 goto out; 907 } 908 909 ptr = zalloc(sizeof(struct cs_etm_recording)); 910 if (!ptr) { 911 *err = -ENOMEM; 912 goto out; 913 } 914 915 ptr->cs_etm_pmu = cs_etm_pmu; 916 ptr->itr.pmu = cs_etm_pmu; 917 ptr->itr.parse_snapshot_options = cs_etm_parse_snapshot_options; 918 ptr->itr.recording_options = cs_etm_recording_options; 919 ptr->itr.info_priv_size = cs_etm_info_priv_size; 920 ptr->itr.info_fill = cs_etm_info_fill; 921 ptr->itr.snapshot_start = cs_etm_snapshot_start; 922 ptr->itr.snapshot_finish = cs_etm_snapshot_finish; 923 ptr->itr.reference = cs_etm_reference; 924 ptr->itr.free = cs_etm_recording_free; 925 ptr->itr.read_finish = auxtrace_record__read_finish; 926 927 *err = 0; 928 return &ptr->itr; 929 out: 930 return NULL; 931 } 932 933 /* 934 * Set a default config to enable the user changed config tracking mechanism 935 * (CFG_CHG and evsel__set_config_if_unset()). If no default is set then user 936 * changes aren't tracked. 937 */ 938 void 939 cs_etm_get_default_config(const struct perf_pmu *pmu __maybe_unused, 940 struct perf_event_attr *attr) 941 { 942 attr->sample_period = 1; 943 } 944