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 if (!perf_cpu_map__has(event_cpus, cpu) || 209 !perf_cpu_map__has(online_cpus, cpu)) 210 continue; 211 212 err = cs_etm_validate_context_id(itr, evsel, i); 213 if (err) 214 goto out; 215 err = cs_etm_validate_timestamp(itr, evsel, i); 216 if (err) 217 goto out; 218 } 219 220 err = 0; 221 out: 222 perf_cpu_map__put(online_cpus); 223 return err; 224 } 225 226 static int cs_etm_parse_snapshot_options(struct auxtrace_record *itr, 227 struct record_opts *opts, 228 const char *str) 229 { 230 struct cs_etm_recording *ptr = 231 container_of(itr, struct cs_etm_recording, itr); 232 unsigned long long snapshot_size = 0; 233 char *endptr; 234 235 if (str) { 236 snapshot_size = strtoull(str, &endptr, 0); 237 if (*endptr || snapshot_size > SIZE_MAX) 238 return -1; 239 } 240 241 opts->auxtrace_snapshot_mode = true; 242 opts->auxtrace_snapshot_size = snapshot_size; 243 ptr->snapshot_size = snapshot_size; 244 245 return 0; 246 } 247 248 static int cs_etm_set_sink_attr(struct perf_pmu *pmu, 249 struct evsel *evsel) 250 { 251 char msg[BUFSIZ], path[PATH_MAX], *sink; 252 struct evsel_config_term *term; 253 int ret = -EINVAL; 254 u32 hash; 255 256 if (evsel->core.attr.config2 & GENMASK(31, 0)) 257 return 0; 258 259 list_for_each_entry(term, &evsel->config_terms, list) { 260 if (term->type != EVSEL__CONFIG_TERM_DRV_CFG) 261 continue; 262 263 sink = term->val.str; 264 snprintf(path, PATH_MAX, "sinks/%s", sink); 265 266 ret = perf_pmu__scan_file(pmu, path, "%x", &hash); 267 if (ret != 1) { 268 if (errno == ENOENT) 269 pr_err("Couldn't find sink \"%s\" on event %s\n" 270 "Missing kernel or device support?\n\n" 271 "Hint: An appropriate sink will be picked automatically if one isn't specified.\n", 272 sink, evsel__name(evsel)); 273 else 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.user_requested_cpus; 301 bool privileged = perf_event_paranoid_check(-1); 302 int err = 0; 303 304 evlist__for_each_entry(evlist, evsel) { 305 if (evsel->core.attr.type == cs_etm_pmu->type) { 306 if (cs_etm_evsel) { 307 pr_err("There may be only one %s event\n", 308 CORESIGHT_ETM_PMU_NAME); 309 return -EINVAL; 310 } 311 cs_etm_evsel = evsel; 312 } 313 } 314 315 /* no need to continue if at least one event of interest was found */ 316 if (!cs_etm_evsel) 317 return 0; 318 319 ptr->evlist = evlist; 320 ptr->snapshot_mode = opts->auxtrace_snapshot_mode; 321 322 if (!record_opts__no_switch_events(opts) && 323 perf_can_record_switch_events()) 324 opts->record_switch_events = true; 325 326 cs_etm_evsel->needs_auxtrace_mmap = true; 327 opts->full_auxtrace = true; 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 /* Buffer sizes weren't specified with '-m,xyz' so give some defaults */ 399 if (!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 if (opts->auxtrace_snapshot_mode) 410 pr_debug2("%s snapshot size: %zu\n", CORESIGHT_ETM_PMU_NAME, 411 opts->auxtrace_snapshot_size); 412 413 /* 414 * To obtain the auxtrace buffer file descriptor, the auxtrace 415 * event must come first. 416 */ 417 evlist__to_front(evlist, cs_etm_evsel); 418 419 /* 420 * get the CPU on the sample - need it to associate trace ID in the 421 * AUX_OUTPUT_HW_ID event, and the AUX event for per-cpu mmaps. 422 */ 423 evsel__set_sample_bit(cs_etm_evsel, CPU); 424 425 /* 426 * Also the case of per-cpu mmaps, need the contextID in order to be notified 427 * when a context switch happened. 428 */ 429 if (!perf_cpu_map__empty(cpus)) { 430 evsel__set_config_if_unset(cs_etm_pmu, cs_etm_evsel, 431 "timestamp", 1); 432 evsel__set_config_if_unset(cs_etm_pmu, cs_etm_evsel, 433 "contextid", 1); 434 } 435 436 /* Add dummy event to keep tracking */ 437 err = parse_event(evlist, "dummy:u"); 438 if (err) 439 goto out; 440 evsel = evlist__last(evlist); 441 evlist__set_tracking_event(evlist, evsel); 442 evsel->core.attr.freq = 0; 443 evsel->core.attr.sample_period = 1; 444 445 /* In per-cpu case, always need the time of mmap events etc */ 446 if (!perf_cpu_map__empty(cpus)) 447 evsel__set_sample_bit(evsel, TIME); 448 449 err = cs_etm_validate_config(itr, cs_etm_evsel); 450 out: 451 return err; 452 } 453 454 static u64 cs_etm_get_config(struct auxtrace_record *itr) 455 { 456 u64 config = 0; 457 struct cs_etm_recording *ptr = 458 container_of(itr, struct cs_etm_recording, itr); 459 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; 460 struct evlist *evlist = ptr->evlist; 461 struct evsel *evsel; 462 463 evlist__for_each_entry(evlist, evsel) { 464 if (evsel->core.attr.type == cs_etm_pmu->type) { 465 /* 466 * Variable perf_event_attr::config is assigned to 467 * ETMv3/PTM. The bit fields have been made to match 468 * the ETMv3.5 ETRMCR register specification. See the 469 * PMU_FORMAT_ATTR() declarations in 470 * drivers/hwtracing/coresight/coresight-perf.c for 471 * details. 472 */ 473 config = evsel->core.attr.config; 474 break; 475 } 476 } 477 478 return config; 479 } 480 481 #ifndef BIT 482 #define BIT(N) (1UL << (N)) 483 #endif 484 485 static u64 cs_etmv4_get_config(struct auxtrace_record *itr) 486 { 487 u64 config = 0; 488 u64 config_opts = 0; 489 490 /* 491 * The perf event variable config bits represent both 492 * the command line options and register programming 493 * bits in ETMv3/PTM. For ETMv4 we must remap options 494 * to real bits 495 */ 496 config_opts = cs_etm_get_config(itr); 497 if (config_opts & BIT(ETM_OPT_CYCACC)) 498 config |= BIT(ETM4_CFG_BIT_CYCACC); 499 if (config_opts & BIT(ETM_OPT_CTXTID)) 500 config |= BIT(ETM4_CFG_BIT_CTXTID); 501 if (config_opts & BIT(ETM_OPT_TS)) 502 config |= BIT(ETM4_CFG_BIT_TS); 503 if (config_opts & BIT(ETM_OPT_RETSTK)) 504 config |= BIT(ETM4_CFG_BIT_RETSTK); 505 if (config_opts & BIT(ETM_OPT_CTXTID2)) 506 config |= BIT(ETM4_CFG_BIT_VMID) | 507 BIT(ETM4_CFG_BIT_VMID_OPT); 508 if (config_opts & BIT(ETM_OPT_BRANCH_BROADCAST)) 509 config |= BIT(ETM4_CFG_BIT_BB); 510 511 return config; 512 } 513 514 static size_t 515 cs_etm_info_priv_size(struct auxtrace_record *itr __maybe_unused, 516 struct evlist *evlist __maybe_unused) 517 { 518 int i; 519 int etmv3 = 0, etmv4 = 0, ete = 0; 520 struct perf_cpu_map *event_cpus = evlist->core.user_requested_cpus; 521 struct perf_cpu_map *online_cpus = perf_cpu_map__new(NULL); 522 523 /* cpu map is not empty, we have specific CPUs to work with */ 524 if (!perf_cpu_map__empty(event_cpus)) { 525 for (i = 0; i < cpu__max_cpu().cpu; i++) { 526 struct perf_cpu cpu = { .cpu = i, }; 527 528 if (!perf_cpu_map__has(event_cpus, cpu) || 529 !perf_cpu_map__has(online_cpus, cpu)) 530 continue; 531 532 if (cs_etm_is_ete(itr, i)) 533 ete++; 534 else if (cs_etm_is_etmv4(itr, i)) 535 etmv4++; 536 else 537 etmv3++; 538 } 539 } else { 540 /* get configuration for all CPUs in the system */ 541 for (i = 0; i < cpu__max_cpu().cpu; i++) { 542 struct perf_cpu cpu = { .cpu = i, }; 543 544 if (!perf_cpu_map__has(online_cpus, cpu)) 545 continue; 546 547 if (cs_etm_is_ete(itr, i)) 548 ete++; 549 else if (cs_etm_is_etmv4(itr, i)) 550 etmv4++; 551 else 552 etmv3++; 553 } 554 } 555 556 perf_cpu_map__put(online_cpus); 557 558 return (CS_ETM_HEADER_SIZE + 559 (ete * CS_ETE_PRIV_SIZE) + 560 (etmv4 * CS_ETMV4_PRIV_SIZE) + 561 (etmv3 * CS_ETMV3_PRIV_SIZE)); 562 } 563 564 static bool cs_etm_is_etmv4(struct auxtrace_record *itr, int cpu) 565 { 566 bool ret = false; 567 char path[PATH_MAX]; 568 int scan; 569 unsigned int val; 570 struct cs_etm_recording *ptr = 571 container_of(itr, struct cs_etm_recording, itr); 572 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; 573 574 /* Take any of the RO files for ETMv4 and see if it present */ 575 snprintf(path, PATH_MAX, "cpu%d/%s", 576 cpu, metadata_etmv4_ro[CS_ETMV4_TRCIDR0]); 577 scan = perf_pmu__scan_file(cs_etm_pmu, path, "%x", &val); 578 579 /* The file was read successfully, we have a winner */ 580 if (scan == 1) 581 ret = true; 582 583 return ret; 584 } 585 586 static int cs_etm_get_ro(struct perf_pmu *pmu, int cpu, const char *path) 587 { 588 char pmu_path[PATH_MAX]; 589 int scan; 590 unsigned int val = 0; 591 592 /* Get RO metadata from sysfs */ 593 snprintf(pmu_path, PATH_MAX, "cpu%d/%s", cpu, path); 594 595 scan = perf_pmu__scan_file(pmu, pmu_path, "%x", &val); 596 if (scan != 1) 597 pr_err("%s: error reading: %s\n", __func__, pmu_path); 598 599 return val; 600 } 601 602 static int cs_etm_get_ro_signed(struct perf_pmu *pmu, int cpu, const char *path) 603 { 604 char pmu_path[PATH_MAX]; 605 int scan; 606 int val = 0; 607 608 /* Get RO metadata from sysfs */ 609 snprintf(pmu_path, PATH_MAX, "cpu%d/%s", cpu, path); 610 611 scan = perf_pmu__scan_file(pmu, pmu_path, "%d", &val); 612 if (scan != 1) 613 pr_err("%s: error reading: %s\n", __func__, pmu_path); 614 615 return val; 616 } 617 618 static bool cs_etm_pmu_path_exists(struct perf_pmu *pmu, int cpu, const char *path) 619 { 620 char pmu_path[PATH_MAX]; 621 622 /* Get RO metadata from sysfs */ 623 snprintf(pmu_path, PATH_MAX, "cpu%d/%s", cpu, path); 624 625 return perf_pmu__file_exists(pmu, pmu_path); 626 } 627 628 #define TRCDEVARCH_ARCHPART_SHIFT 0 629 #define TRCDEVARCH_ARCHPART_MASK GENMASK(11, 0) 630 #define TRCDEVARCH_ARCHPART(x) (((x) & TRCDEVARCH_ARCHPART_MASK) >> TRCDEVARCH_ARCHPART_SHIFT) 631 632 #define TRCDEVARCH_ARCHVER_SHIFT 12 633 #define TRCDEVARCH_ARCHVER_MASK GENMASK(15, 12) 634 #define TRCDEVARCH_ARCHVER(x) (((x) & TRCDEVARCH_ARCHVER_MASK) >> TRCDEVARCH_ARCHVER_SHIFT) 635 636 static bool cs_etm_is_ete(struct auxtrace_record *itr, int cpu) 637 { 638 struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr); 639 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; 640 int trcdevarch; 641 642 if (!cs_etm_pmu_path_exists(cs_etm_pmu, cpu, metadata_ete_ro[CS_ETE_TRCDEVARCH])) 643 return false; 644 645 trcdevarch = cs_etm_get_ro(cs_etm_pmu, cpu, metadata_ete_ro[CS_ETE_TRCDEVARCH]); 646 /* 647 * ETE if ARCHVER is 5 (ARCHVER is 4 for ETM) and ARCHPART is 0xA13. 648 * See ETM_DEVARCH_ETE_ARCH in coresight-etm4x.h 649 */ 650 return TRCDEVARCH_ARCHVER(trcdevarch) == 5 && TRCDEVARCH_ARCHPART(trcdevarch) == 0xA13; 651 } 652 653 static void cs_etm_save_etmv4_header(__u64 data[], struct auxtrace_record *itr, int cpu) 654 { 655 struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr); 656 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; 657 658 /* Get trace configuration register */ 659 data[CS_ETMV4_TRCCONFIGR] = cs_etmv4_get_config(itr); 660 /* traceID set to legacy version, in case new perf running on older system */ 661 data[CS_ETMV4_TRCTRACEIDR] = 662 CORESIGHT_LEGACY_CPU_TRACE_ID(cpu) | CORESIGHT_TRACE_ID_UNUSED_FLAG; 663 664 /* Get read-only information from sysFS */ 665 data[CS_ETMV4_TRCIDR0] = cs_etm_get_ro(cs_etm_pmu, cpu, 666 metadata_etmv4_ro[CS_ETMV4_TRCIDR0]); 667 data[CS_ETMV4_TRCIDR1] = cs_etm_get_ro(cs_etm_pmu, cpu, 668 metadata_etmv4_ro[CS_ETMV4_TRCIDR1]); 669 data[CS_ETMV4_TRCIDR2] = cs_etm_get_ro(cs_etm_pmu, cpu, 670 metadata_etmv4_ro[CS_ETMV4_TRCIDR2]); 671 data[CS_ETMV4_TRCIDR8] = cs_etm_get_ro(cs_etm_pmu, cpu, 672 metadata_etmv4_ro[CS_ETMV4_TRCIDR8]); 673 data[CS_ETMV4_TRCAUTHSTATUS] = cs_etm_get_ro(cs_etm_pmu, cpu, 674 metadata_etmv4_ro[CS_ETMV4_TRCAUTHSTATUS]); 675 676 /* Kernels older than 5.19 may not expose ts_source */ 677 if (cs_etm_pmu_path_exists(cs_etm_pmu, cpu, metadata_etmv4_ro[CS_ETMV4_TS_SOURCE])) 678 data[CS_ETMV4_TS_SOURCE] = (__u64) cs_etm_get_ro_signed(cs_etm_pmu, cpu, 679 metadata_etmv4_ro[CS_ETMV4_TS_SOURCE]); 680 else { 681 pr_debug3("[%03d] pmu file 'ts_source' not found. Fallback to safe value (-1)\n", 682 cpu); 683 data[CS_ETMV4_TS_SOURCE] = (__u64) -1; 684 } 685 } 686 687 static void cs_etm_save_ete_header(__u64 data[], struct auxtrace_record *itr, int cpu) 688 { 689 struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr); 690 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; 691 692 /* Get trace configuration register */ 693 data[CS_ETE_TRCCONFIGR] = cs_etmv4_get_config(itr); 694 /* traceID set to legacy version, in case new perf running on older system */ 695 data[CS_ETE_TRCTRACEIDR] = 696 CORESIGHT_LEGACY_CPU_TRACE_ID(cpu) | CORESIGHT_TRACE_ID_UNUSED_FLAG; 697 698 /* Get read-only information from sysFS */ 699 data[CS_ETE_TRCIDR0] = cs_etm_get_ro(cs_etm_pmu, cpu, 700 metadata_ete_ro[CS_ETE_TRCIDR0]); 701 data[CS_ETE_TRCIDR1] = cs_etm_get_ro(cs_etm_pmu, cpu, 702 metadata_ete_ro[CS_ETE_TRCIDR1]); 703 data[CS_ETE_TRCIDR2] = cs_etm_get_ro(cs_etm_pmu, cpu, 704 metadata_ete_ro[CS_ETE_TRCIDR2]); 705 data[CS_ETE_TRCIDR8] = cs_etm_get_ro(cs_etm_pmu, cpu, 706 metadata_ete_ro[CS_ETE_TRCIDR8]); 707 data[CS_ETE_TRCAUTHSTATUS] = cs_etm_get_ro(cs_etm_pmu, cpu, 708 metadata_ete_ro[CS_ETE_TRCAUTHSTATUS]); 709 /* ETE uses the same registers as ETMv4 plus TRCDEVARCH */ 710 data[CS_ETE_TRCDEVARCH] = cs_etm_get_ro(cs_etm_pmu, cpu, 711 metadata_ete_ro[CS_ETE_TRCDEVARCH]); 712 713 /* Kernels older than 5.19 may not expose ts_source */ 714 if (cs_etm_pmu_path_exists(cs_etm_pmu, cpu, metadata_ete_ro[CS_ETE_TS_SOURCE])) 715 data[CS_ETE_TS_SOURCE] = (__u64) cs_etm_get_ro_signed(cs_etm_pmu, cpu, 716 metadata_ete_ro[CS_ETE_TS_SOURCE]); 717 else { 718 pr_debug3("[%03d] pmu file 'ts_source' not found. Fallback to safe value (-1)\n", 719 cpu); 720 data[CS_ETE_TS_SOURCE] = (__u64) -1; 721 } 722 } 723 724 static void cs_etm_get_metadata(int cpu, u32 *offset, 725 struct auxtrace_record *itr, 726 struct perf_record_auxtrace_info *info) 727 { 728 u32 increment, nr_trc_params; 729 u64 magic; 730 struct cs_etm_recording *ptr = 731 container_of(itr, struct cs_etm_recording, itr); 732 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; 733 734 /* first see what kind of tracer this cpu is affined to */ 735 if (cs_etm_is_ete(itr, cpu)) { 736 magic = __perf_cs_ete_magic; 737 cs_etm_save_ete_header(&info->priv[*offset], itr, cpu); 738 739 /* How much space was used */ 740 increment = CS_ETE_PRIV_MAX; 741 nr_trc_params = CS_ETE_PRIV_MAX - CS_ETM_COMMON_BLK_MAX_V1; 742 } else if (cs_etm_is_etmv4(itr, cpu)) { 743 magic = __perf_cs_etmv4_magic; 744 cs_etm_save_etmv4_header(&info->priv[*offset], itr, cpu); 745 746 /* How much space was used */ 747 increment = CS_ETMV4_PRIV_MAX; 748 nr_trc_params = CS_ETMV4_PRIV_MAX - CS_ETMV4_TRCCONFIGR; 749 } else { 750 magic = __perf_cs_etmv3_magic; 751 /* Get configuration register */ 752 info->priv[*offset + CS_ETM_ETMCR] = cs_etm_get_config(itr); 753 /* traceID set to legacy value in case new perf running on old system */ 754 info->priv[*offset + CS_ETM_ETMTRACEIDR] = 755 CORESIGHT_LEGACY_CPU_TRACE_ID(cpu) | CORESIGHT_TRACE_ID_UNUSED_FLAG; 756 /* Get read-only information from sysFS */ 757 info->priv[*offset + CS_ETM_ETMCCER] = 758 cs_etm_get_ro(cs_etm_pmu, cpu, 759 metadata_etmv3_ro[CS_ETM_ETMCCER]); 760 info->priv[*offset + CS_ETM_ETMIDR] = 761 cs_etm_get_ro(cs_etm_pmu, cpu, 762 metadata_etmv3_ro[CS_ETM_ETMIDR]); 763 764 /* How much space was used */ 765 increment = CS_ETM_PRIV_MAX; 766 nr_trc_params = CS_ETM_PRIV_MAX - CS_ETM_ETMCR; 767 } 768 769 /* Build generic header portion */ 770 info->priv[*offset + CS_ETM_MAGIC] = magic; 771 info->priv[*offset + CS_ETM_CPU] = cpu; 772 info->priv[*offset + CS_ETM_NR_TRC_PARAMS] = nr_trc_params; 773 /* Where the next CPU entry should start from */ 774 *offset += increment; 775 } 776 777 static int cs_etm_info_fill(struct auxtrace_record *itr, 778 struct perf_session *session, 779 struct perf_record_auxtrace_info *info, 780 size_t priv_size) 781 { 782 int i; 783 u32 offset; 784 u64 nr_cpu, type; 785 struct perf_cpu_map *cpu_map; 786 struct perf_cpu_map *event_cpus = session->evlist->core.user_requested_cpus; 787 struct perf_cpu_map *online_cpus = perf_cpu_map__new(NULL); 788 struct cs_etm_recording *ptr = 789 container_of(itr, struct cs_etm_recording, itr); 790 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; 791 792 if (priv_size != cs_etm_info_priv_size(itr, session->evlist)) 793 return -EINVAL; 794 795 if (!session->evlist->core.nr_mmaps) 796 return -EINVAL; 797 798 /* If the cpu_map is empty all online CPUs are involved */ 799 if (perf_cpu_map__empty(event_cpus)) { 800 cpu_map = online_cpus; 801 } else { 802 /* Make sure all specified CPUs are online */ 803 for (i = 0; i < perf_cpu_map__nr(event_cpus); i++) { 804 struct perf_cpu cpu = { .cpu = i, }; 805 806 if (perf_cpu_map__has(event_cpus, cpu) && 807 !perf_cpu_map__has(online_cpus, cpu)) 808 return -EINVAL; 809 } 810 811 cpu_map = event_cpus; 812 } 813 814 nr_cpu = perf_cpu_map__nr(cpu_map); 815 /* Get PMU type as dynamically assigned by the core */ 816 type = cs_etm_pmu->type; 817 818 /* First fill out the session header */ 819 info->type = PERF_AUXTRACE_CS_ETM; 820 info->priv[CS_HEADER_VERSION] = CS_HEADER_CURRENT_VERSION; 821 info->priv[CS_PMU_TYPE_CPUS] = type << 32; 822 info->priv[CS_PMU_TYPE_CPUS] |= nr_cpu; 823 info->priv[CS_ETM_SNAPSHOT] = ptr->snapshot_mode; 824 825 offset = CS_ETM_SNAPSHOT + 1; 826 827 for (i = 0; i < cpu__max_cpu().cpu && offset < priv_size; i++) { 828 struct perf_cpu cpu = { .cpu = i, }; 829 830 if (perf_cpu_map__has(cpu_map, cpu)) 831 cs_etm_get_metadata(i, &offset, itr, info); 832 } 833 834 perf_cpu_map__put(online_cpus); 835 836 return 0; 837 } 838 839 static int cs_etm_snapshot_start(struct auxtrace_record *itr) 840 { 841 struct cs_etm_recording *ptr = 842 container_of(itr, struct cs_etm_recording, itr); 843 struct evsel *evsel; 844 845 evlist__for_each_entry(ptr->evlist, evsel) { 846 if (evsel->core.attr.type == ptr->cs_etm_pmu->type) 847 return evsel__disable(evsel); 848 } 849 return -EINVAL; 850 } 851 852 static int cs_etm_snapshot_finish(struct auxtrace_record *itr) 853 { 854 struct cs_etm_recording *ptr = 855 container_of(itr, struct cs_etm_recording, itr); 856 struct evsel *evsel; 857 858 evlist__for_each_entry(ptr->evlist, evsel) { 859 if (evsel->core.attr.type == ptr->cs_etm_pmu->type) 860 return evsel__enable(evsel); 861 } 862 return -EINVAL; 863 } 864 865 static u64 cs_etm_reference(struct auxtrace_record *itr __maybe_unused) 866 { 867 return (((u64) rand() << 0) & 0x00000000FFFFFFFFull) | 868 (((u64) rand() << 32) & 0xFFFFFFFF00000000ull); 869 } 870 871 static void cs_etm_recording_free(struct auxtrace_record *itr) 872 { 873 struct cs_etm_recording *ptr = 874 container_of(itr, struct cs_etm_recording, itr); 875 876 free(ptr); 877 } 878 879 struct auxtrace_record *cs_etm_record_init(int *err) 880 { 881 struct perf_pmu *cs_etm_pmu; 882 struct cs_etm_recording *ptr; 883 884 cs_etm_pmu = perf_pmus__find(CORESIGHT_ETM_PMU_NAME); 885 886 if (!cs_etm_pmu) { 887 *err = -EINVAL; 888 goto out; 889 } 890 891 ptr = zalloc(sizeof(struct cs_etm_recording)); 892 if (!ptr) { 893 *err = -ENOMEM; 894 goto out; 895 } 896 897 ptr->cs_etm_pmu = cs_etm_pmu; 898 ptr->itr.pmu = cs_etm_pmu; 899 ptr->itr.parse_snapshot_options = cs_etm_parse_snapshot_options; 900 ptr->itr.recording_options = cs_etm_recording_options; 901 ptr->itr.info_priv_size = cs_etm_info_priv_size; 902 ptr->itr.info_fill = cs_etm_info_fill; 903 ptr->itr.snapshot_start = cs_etm_snapshot_start; 904 ptr->itr.snapshot_finish = cs_etm_snapshot_finish; 905 ptr->itr.reference = cs_etm_reference; 906 ptr->itr.free = cs_etm_recording_free; 907 ptr->itr.read_finish = auxtrace_record__read_finish; 908 909 *err = 0; 910 return &ptr->itr; 911 out: 912 return NULL; 913 } 914 915 /* 916 * Set a default config to enable the user changed config tracking mechanism 917 * (CFG_CHG and evsel__set_config_if_unset()). If no default is set then user 918 * changes aren't tracked. 919 */ 920 struct perf_event_attr * 921 cs_etm_get_default_config(struct perf_pmu *pmu __maybe_unused) 922 { 923 struct perf_event_attr *attr; 924 925 attr = zalloc(sizeof(struct perf_event_attr)); 926 if (!attr) 927 return NULL; 928 929 attr->sample_period = 1; 930 931 return attr; 932 } 933