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