1 /* 2 * Support cstate residency counters 3 * 4 * Copyright (C) 2015, Intel Corp. 5 * Author: Kan Liang (kan.liang@intel.com) 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Library General Public 9 * License as published by the Free Software Foundation; either 10 * version 2 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Library General Public License for more details. 16 * 17 */ 18 19 /* 20 * This file export cstate related free running (read-only) counters 21 * for perf. These counters may be use simultaneously by other tools, 22 * such as turbostat. However, it still make sense to implement them 23 * in perf. Because we can conveniently collect them together with 24 * other events, and allow to use them from tools without special MSR 25 * access code. 26 * 27 * The events only support system-wide mode counting. There is no 28 * sampling support because it is not supported by the hardware. 29 * 30 * According to counters' scope and category, two PMUs are registered 31 * with the perf_event core subsystem. 32 * - 'cstate_core': The counter is available for each physical core. 33 * The counters include CORE_C*_RESIDENCY. 34 * - 'cstate_pkg': The counter is available for each physical package. 35 * The counters include PKG_C*_RESIDENCY. 36 * 37 * All of these counters are specified in the Intel® 64 and IA-32 38 * Architectures Software Developer.s Manual Vol3b. 39 * 40 * Model specific counters: 41 * MSR_CORE_C1_RES: CORE C1 Residency Counter 42 * perf code: 0x00 43 * Available model: SLM,AMT,GLM,CNL,TNT,ADL 44 * Scope: Core (each processor core has a MSR) 45 * MSR_CORE_C3_RESIDENCY: CORE C3 Residency Counter 46 * perf code: 0x01 47 * Available model: NHM,WSM,SNB,IVB,HSW,BDW,SKL,GLM, 48 * CNL,KBL,CML,TNT 49 * Scope: Core 50 * MSR_CORE_C6_RESIDENCY: CORE C6 Residency Counter 51 * perf code: 0x02 52 * Available model: SLM,AMT,NHM,WSM,SNB,IVB,HSW,BDW, 53 * SKL,KNL,GLM,CNL,KBL,CML,ICL,TGL, 54 * TNT,RKL,ADL 55 * Scope: Core 56 * MSR_CORE_C7_RESIDENCY: CORE C7 Residency Counter 57 * perf code: 0x03 58 * Available model: SNB,IVB,HSW,BDW,SKL,CNL,KBL,CML, 59 * ICL,TGL,RKL,ADL 60 * Scope: Core 61 * MSR_PKG_C2_RESIDENCY: Package C2 Residency Counter. 62 * perf code: 0x00 63 * Available model: SNB,IVB,HSW,BDW,SKL,KNL,GLM,CNL, 64 * KBL,CML,ICL,TGL,TNT,RKL,ADL 65 * Scope: Package (physical package) 66 * MSR_PKG_C3_RESIDENCY: Package C3 Residency Counter. 67 * perf code: 0x01 68 * Available model: NHM,WSM,SNB,IVB,HSW,BDW,SKL,KNL, 69 * GLM,CNL,KBL,CML,ICL,TGL,TNT,RKL, 70 * ADL 71 * Scope: Package (physical package) 72 * MSR_PKG_C6_RESIDENCY: Package C6 Residency Counter. 73 * perf code: 0x02 74 * Available model: SLM,AMT,NHM,WSM,SNB,IVB,HSW,BDW, 75 * SKL,KNL,GLM,CNL,KBL,CML,ICL,TGL, 76 * TNT,RKL,ADL 77 * Scope: Package (physical package) 78 * MSR_PKG_C7_RESIDENCY: Package C7 Residency Counter. 79 * perf code: 0x03 80 * Available model: NHM,WSM,SNB,IVB,HSW,BDW,SKL,CNL, 81 * KBL,CML,ICL,TGL,RKL,ADL 82 * Scope: Package (physical package) 83 * MSR_PKG_C8_RESIDENCY: Package C8 Residency Counter. 84 * perf code: 0x04 85 * Available model: HSW ULT,KBL,CNL,CML,ICL,TGL,RKL, 86 * ADL 87 * Scope: Package (physical package) 88 * MSR_PKG_C9_RESIDENCY: Package C9 Residency Counter. 89 * perf code: 0x05 90 * Available model: HSW ULT,KBL,CNL,CML,ICL,TGL,RKL, 91 * ADL 92 * Scope: Package (physical package) 93 * MSR_PKG_C10_RESIDENCY: Package C10 Residency Counter. 94 * perf code: 0x06 95 * Available model: HSW ULT,KBL,GLM,CNL,CML,ICL,TGL, 96 * TNT,RKL,ADL 97 * Scope: Package (physical package) 98 * 99 */ 100 101 #include <linux/module.h> 102 #include <linux/slab.h> 103 #include <linux/perf_event.h> 104 #include <linux/nospec.h> 105 #include <asm/cpu_device_id.h> 106 #include <asm/intel-family.h> 107 #include "../perf_event.h" 108 #include "../probe.h" 109 110 MODULE_LICENSE("GPL"); 111 112 #define DEFINE_CSTATE_FORMAT_ATTR(_var, _name, _format) \ 113 static ssize_t __cstate_##_var##_show(struct device *dev, \ 114 struct device_attribute *attr, \ 115 char *page) \ 116 { \ 117 BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \ 118 return sprintf(page, _format "\n"); \ 119 } \ 120 static struct device_attribute format_attr_##_var = \ 121 __ATTR(_name, 0444, __cstate_##_var##_show, NULL) 122 123 static ssize_t cstate_get_attr_cpumask(struct device *dev, 124 struct device_attribute *attr, 125 char *buf); 126 127 /* Model -> events mapping */ 128 struct cstate_model { 129 unsigned long core_events; 130 unsigned long pkg_events; 131 unsigned long quirks; 132 }; 133 134 /* Quirk flags */ 135 #define SLM_PKG_C6_USE_C7_MSR (1UL << 0) 136 #define KNL_CORE_C6_MSR (1UL << 1) 137 138 struct perf_cstate_msr { 139 u64 msr; 140 struct perf_pmu_events_attr *attr; 141 }; 142 143 144 /* cstate_core PMU */ 145 static struct pmu cstate_core_pmu; 146 static bool has_cstate_core; 147 148 enum perf_cstate_core_events { 149 PERF_CSTATE_CORE_C1_RES = 0, 150 PERF_CSTATE_CORE_C3_RES, 151 PERF_CSTATE_CORE_C6_RES, 152 PERF_CSTATE_CORE_C7_RES, 153 154 PERF_CSTATE_CORE_EVENT_MAX, 155 }; 156 157 PMU_EVENT_ATTR_STRING(c1-residency, attr_cstate_core_c1, "event=0x00"); 158 PMU_EVENT_ATTR_STRING(c3-residency, attr_cstate_core_c3, "event=0x01"); 159 PMU_EVENT_ATTR_STRING(c6-residency, attr_cstate_core_c6, "event=0x02"); 160 PMU_EVENT_ATTR_STRING(c7-residency, attr_cstate_core_c7, "event=0x03"); 161 162 static unsigned long core_msr_mask; 163 164 PMU_EVENT_GROUP(events, cstate_core_c1); 165 PMU_EVENT_GROUP(events, cstate_core_c3); 166 PMU_EVENT_GROUP(events, cstate_core_c6); 167 PMU_EVENT_GROUP(events, cstate_core_c7); 168 169 static bool test_msr(int idx, void *data) 170 { 171 return test_bit(idx, (unsigned long *) data); 172 } 173 174 static struct perf_msr core_msr[] = { 175 [PERF_CSTATE_CORE_C1_RES] = { MSR_CORE_C1_RES, &group_cstate_core_c1, test_msr }, 176 [PERF_CSTATE_CORE_C3_RES] = { MSR_CORE_C3_RESIDENCY, &group_cstate_core_c3, test_msr }, 177 [PERF_CSTATE_CORE_C6_RES] = { MSR_CORE_C6_RESIDENCY, &group_cstate_core_c6, test_msr }, 178 [PERF_CSTATE_CORE_C7_RES] = { MSR_CORE_C7_RESIDENCY, &group_cstate_core_c7, test_msr }, 179 }; 180 181 static struct attribute *attrs_empty[] = { 182 NULL, 183 }; 184 185 /* 186 * There are no default events, but we need to create 187 * "events" group (with empty attrs) before updating 188 * it with detected events. 189 */ 190 static struct attribute_group core_events_attr_group = { 191 .name = "events", 192 .attrs = attrs_empty, 193 }; 194 195 DEFINE_CSTATE_FORMAT_ATTR(core_event, event, "config:0-63"); 196 static struct attribute *core_format_attrs[] = { 197 &format_attr_core_event.attr, 198 NULL, 199 }; 200 201 static struct attribute_group core_format_attr_group = { 202 .name = "format", 203 .attrs = core_format_attrs, 204 }; 205 206 static cpumask_t cstate_core_cpu_mask; 207 static DEVICE_ATTR(cpumask, S_IRUGO, cstate_get_attr_cpumask, NULL); 208 209 static struct attribute *cstate_cpumask_attrs[] = { 210 &dev_attr_cpumask.attr, 211 NULL, 212 }; 213 214 static struct attribute_group cpumask_attr_group = { 215 .attrs = cstate_cpumask_attrs, 216 }; 217 218 static const struct attribute_group *core_attr_groups[] = { 219 &core_events_attr_group, 220 &core_format_attr_group, 221 &cpumask_attr_group, 222 NULL, 223 }; 224 225 /* cstate_pkg PMU */ 226 static struct pmu cstate_pkg_pmu; 227 static bool has_cstate_pkg; 228 229 enum perf_cstate_pkg_events { 230 PERF_CSTATE_PKG_C2_RES = 0, 231 PERF_CSTATE_PKG_C3_RES, 232 PERF_CSTATE_PKG_C6_RES, 233 PERF_CSTATE_PKG_C7_RES, 234 PERF_CSTATE_PKG_C8_RES, 235 PERF_CSTATE_PKG_C9_RES, 236 PERF_CSTATE_PKG_C10_RES, 237 238 PERF_CSTATE_PKG_EVENT_MAX, 239 }; 240 241 PMU_EVENT_ATTR_STRING(c2-residency, attr_cstate_pkg_c2, "event=0x00"); 242 PMU_EVENT_ATTR_STRING(c3-residency, attr_cstate_pkg_c3, "event=0x01"); 243 PMU_EVENT_ATTR_STRING(c6-residency, attr_cstate_pkg_c6, "event=0x02"); 244 PMU_EVENT_ATTR_STRING(c7-residency, attr_cstate_pkg_c7, "event=0x03"); 245 PMU_EVENT_ATTR_STRING(c8-residency, attr_cstate_pkg_c8, "event=0x04"); 246 PMU_EVENT_ATTR_STRING(c9-residency, attr_cstate_pkg_c9, "event=0x05"); 247 PMU_EVENT_ATTR_STRING(c10-residency, attr_cstate_pkg_c10, "event=0x06"); 248 249 static unsigned long pkg_msr_mask; 250 251 PMU_EVENT_GROUP(events, cstate_pkg_c2); 252 PMU_EVENT_GROUP(events, cstate_pkg_c3); 253 PMU_EVENT_GROUP(events, cstate_pkg_c6); 254 PMU_EVENT_GROUP(events, cstate_pkg_c7); 255 PMU_EVENT_GROUP(events, cstate_pkg_c8); 256 PMU_EVENT_GROUP(events, cstate_pkg_c9); 257 PMU_EVENT_GROUP(events, cstate_pkg_c10); 258 259 static struct perf_msr pkg_msr[] = { 260 [PERF_CSTATE_PKG_C2_RES] = { MSR_PKG_C2_RESIDENCY, &group_cstate_pkg_c2, test_msr }, 261 [PERF_CSTATE_PKG_C3_RES] = { MSR_PKG_C3_RESIDENCY, &group_cstate_pkg_c3, test_msr }, 262 [PERF_CSTATE_PKG_C6_RES] = { MSR_PKG_C6_RESIDENCY, &group_cstate_pkg_c6, test_msr }, 263 [PERF_CSTATE_PKG_C7_RES] = { MSR_PKG_C7_RESIDENCY, &group_cstate_pkg_c7, test_msr }, 264 [PERF_CSTATE_PKG_C8_RES] = { MSR_PKG_C8_RESIDENCY, &group_cstate_pkg_c8, test_msr }, 265 [PERF_CSTATE_PKG_C9_RES] = { MSR_PKG_C9_RESIDENCY, &group_cstate_pkg_c9, test_msr }, 266 [PERF_CSTATE_PKG_C10_RES] = { MSR_PKG_C10_RESIDENCY, &group_cstate_pkg_c10, test_msr }, 267 }; 268 269 static struct attribute_group pkg_events_attr_group = { 270 .name = "events", 271 .attrs = attrs_empty, 272 }; 273 274 DEFINE_CSTATE_FORMAT_ATTR(pkg_event, event, "config:0-63"); 275 static struct attribute *pkg_format_attrs[] = { 276 &format_attr_pkg_event.attr, 277 NULL, 278 }; 279 static struct attribute_group pkg_format_attr_group = { 280 .name = "format", 281 .attrs = pkg_format_attrs, 282 }; 283 284 static cpumask_t cstate_pkg_cpu_mask; 285 286 static const struct attribute_group *pkg_attr_groups[] = { 287 &pkg_events_attr_group, 288 &pkg_format_attr_group, 289 &cpumask_attr_group, 290 NULL, 291 }; 292 293 static ssize_t cstate_get_attr_cpumask(struct device *dev, 294 struct device_attribute *attr, 295 char *buf) 296 { 297 struct pmu *pmu = dev_get_drvdata(dev); 298 299 if (pmu == &cstate_core_pmu) 300 return cpumap_print_to_pagebuf(true, buf, &cstate_core_cpu_mask); 301 else if (pmu == &cstate_pkg_pmu) 302 return cpumap_print_to_pagebuf(true, buf, &cstate_pkg_cpu_mask); 303 else 304 return 0; 305 } 306 307 static int cstate_pmu_event_init(struct perf_event *event) 308 { 309 u64 cfg = event->attr.config; 310 int cpu; 311 312 if (event->attr.type != event->pmu->type) 313 return -ENOENT; 314 315 /* unsupported modes and filters */ 316 if (event->attr.sample_period) /* no sampling */ 317 return -EINVAL; 318 319 if (event->cpu < 0) 320 return -EINVAL; 321 322 if (event->pmu == &cstate_core_pmu) { 323 if (cfg >= PERF_CSTATE_CORE_EVENT_MAX) 324 return -EINVAL; 325 cfg = array_index_nospec((unsigned long)cfg, PERF_CSTATE_CORE_EVENT_MAX); 326 if (!(core_msr_mask & (1 << cfg))) 327 return -EINVAL; 328 event->hw.event_base = core_msr[cfg].msr; 329 cpu = cpumask_any_and(&cstate_core_cpu_mask, 330 topology_sibling_cpumask(event->cpu)); 331 } else if (event->pmu == &cstate_pkg_pmu) { 332 if (cfg >= PERF_CSTATE_PKG_EVENT_MAX) 333 return -EINVAL; 334 cfg = array_index_nospec((unsigned long)cfg, PERF_CSTATE_PKG_EVENT_MAX); 335 if (!(pkg_msr_mask & (1 << cfg))) 336 return -EINVAL; 337 event->hw.event_base = pkg_msr[cfg].msr; 338 cpu = cpumask_any_and(&cstate_pkg_cpu_mask, 339 topology_die_cpumask(event->cpu)); 340 } else { 341 return -ENOENT; 342 } 343 344 if (cpu >= nr_cpu_ids) 345 return -ENODEV; 346 347 event->cpu = cpu; 348 event->hw.config = cfg; 349 event->hw.idx = -1; 350 return 0; 351 } 352 353 static inline u64 cstate_pmu_read_counter(struct perf_event *event) 354 { 355 u64 val; 356 357 rdmsrl(event->hw.event_base, val); 358 return val; 359 } 360 361 static void cstate_pmu_event_update(struct perf_event *event) 362 { 363 struct hw_perf_event *hwc = &event->hw; 364 u64 prev_raw_count, new_raw_count; 365 366 again: 367 prev_raw_count = local64_read(&hwc->prev_count); 368 new_raw_count = cstate_pmu_read_counter(event); 369 370 if (local64_cmpxchg(&hwc->prev_count, prev_raw_count, 371 new_raw_count) != prev_raw_count) 372 goto again; 373 374 local64_add(new_raw_count - prev_raw_count, &event->count); 375 } 376 377 static void cstate_pmu_event_start(struct perf_event *event, int mode) 378 { 379 local64_set(&event->hw.prev_count, cstate_pmu_read_counter(event)); 380 } 381 382 static void cstate_pmu_event_stop(struct perf_event *event, int mode) 383 { 384 cstate_pmu_event_update(event); 385 } 386 387 static void cstate_pmu_event_del(struct perf_event *event, int mode) 388 { 389 cstate_pmu_event_stop(event, PERF_EF_UPDATE); 390 } 391 392 static int cstate_pmu_event_add(struct perf_event *event, int mode) 393 { 394 if (mode & PERF_EF_START) 395 cstate_pmu_event_start(event, mode); 396 397 return 0; 398 } 399 400 /* 401 * Check if exiting cpu is the designated reader. If so migrate the 402 * events when there is a valid target available 403 */ 404 static int cstate_cpu_exit(unsigned int cpu) 405 { 406 unsigned int target; 407 408 if (has_cstate_core && 409 cpumask_test_and_clear_cpu(cpu, &cstate_core_cpu_mask)) { 410 411 target = cpumask_any_but(topology_sibling_cpumask(cpu), cpu); 412 /* Migrate events if there is a valid target */ 413 if (target < nr_cpu_ids) { 414 cpumask_set_cpu(target, &cstate_core_cpu_mask); 415 perf_pmu_migrate_context(&cstate_core_pmu, cpu, target); 416 } 417 } 418 419 if (has_cstate_pkg && 420 cpumask_test_and_clear_cpu(cpu, &cstate_pkg_cpu_mask)) { 421 422 target = cpumask_any_but(topology_die_cpumask(cpu), cpu); 423 /* Migrate events if there is a valid target */ 424 if (target < nr_cpu_ids) { 425 cpumask_set_cpu(target, &cstate_pkg_cpu_mask); 426 perf_pmu_migrate_context(&cstate_pkg_pmu, cpu, target); 427 } 428 } 429 return 0; 430 } 431 432 static int cstate_cpu_init(unsigned int cpu) 433 { 434 unsigned int target; 435 436 /* 437 * If this is the first online thread of that core, set it in 438 * the core cpu mask as the designated reader. 439 */ 440 target = cpumask_any_and(&cstate_core_cpu_mask, 441 topology_sibling_cpumask(cpu)); 442 443 if (has_cstate_core && target >= nr_cpu_ids) 444 cpumask_set_cpu(cpu, &cstate_core_cpu_mask); 445 446 /* 447 * If this is the first online thread of that package, set it 448 * in the package cpu mask as the designated reader. 449 */ 450 target = cpumask_any_and(&cstate_pkg_cpu_mask, 451 topology_die_cpumask(cpu)); 452 if (has_cstate_pkg && target >= nr_cpu_ids) 453 cpumask_set_cpu(cpu, &cstate_pkg_cpu_mask); 454 455 return 0; 456 } 457 458 static const struct attribute_group *core_attr_update[] = { 459 &group_cstate_core_c1, 460 &group_cstate_core_c3, 461 &group_cstate_core_c6, 462 &group_cstate_core_c7, 463 NULL, 464 }; 465 466 static const struct attribute_group *pkg_attr_update[] = { 467 &group_cstate_pkg_c2, 468 &group_cstate_pkg_c3, 469 &group_cstate_pkg_c6, 470 &group_cstate_pkg_c7, 471 &group_cstate_pkg_c8, 472 &group_cstate_pkg_c9, 473 &group_cstate_pkg_c10, 474 NULL, 475 }; 476 477 static struct pmu cstate_core_pmu = { 478 .attr_groups = core_attr_groups, 479 .attr_update = core_attr_update, 480 .name = "cstate_core", 481 .task_ctx_nr = perf_invalid_context, 482 .event_init = cstate_pmu_event_init, 483 .add = cstate_pmu_event_add, 484 .del = cstate_pmu_event_del, 485 .start = cstate_pmu_event_start, 486 .stop = cstate_pmu_event_stop, 487 .read = cstate_pmu_event_update, 488 .capabilities = PERF_PMU_CAP_NO_INTERRUPT | PERF_PMU_CAP_NO_EXCLUDE, 489 .module = THIS_MODULE, 490 }; 491 492 static struct pmu cstate_pkg_pmu = { 493 .attr_groups = pkg_attr_groups, 494 .attr_update = pkg_attr_update, 495 .name = "cstate_pkg", 496 .task_ctx_nr = perf_invalid_context, 497 .event_init = cstate_pmu_event_init, 498 .add = cstate_pmu_event_add, 499 .del = cstate_pmu_event_del, 500 .start = cstate_pmu_event_start, 501 .stop = cstate_pmu_event_stop, 502 .read = cstate_pmu_event_update, 503 .capabilities = PERF_PMU_CAP_NO_INTERRUPT | PERF_PMU_CAP_NO_EXCLUDE, 504 .module = THIS_MODULE, 505 }; 506 507 static const struct cstate_model nhm_cstates __initconst = { 508 .core_events = BIT(PERF_CSTATE_CORE_C3_RES) | 509 BIT(PERF_CSTATE_CORE_C6_RES), 510 511 .pkg_events = BIT(PERF_CSTATE_PKG_C3_RES) | 512 BIT(PERF_CSTATE_PKG_C6_RES) | 513 BIT(PERF_CSTATE_PKG_C7_RES), 514 }; 515 516 static const struct cstate_model snb_cstates __initconst = { 517 .core_events = BIT(PERF_CSTATE_CORE_C3_RES) | 518 BIT(PERF_CSTATE_CORE_C6_RES) | 519 BIT(PERF_CSTATE_CORE_C7_RES), 520 521 .pkg_events = BIT(PERF_CSTATE_PKG_C2_RES) | 522 BIT(PERF_CSTATE_PKG_C3_RES) | 523 BIT(PERF_CSTATE_PKG_C6_RES) | 524 BIT(PERF_CSTATE_PKG_C7_RES), 525 }; 526 527 static const struct cstate_model hswult_cstates __initconst = { 528 .core_events = BIT(PERF_CSTATE_CORE_C3_RES) | 529 BIT(PERF_CSTATE_CORE_C6_RES) | 530 BIT(PERF_CSTATE_CORE_C7_RES), 531 532 .pkg_events = BIT(PERF_CSTATE_PKG_C2_RES) | 533 BIT(PERF_CSTATE_PKG_C3_RES) | 534 BIT(PERF_CSTATE_PKG_C6_RES) | 535 BIT(PERF_CSTATE_PKG_C7_RES) | 536 BIT(PERF_CSTATE_PKG_C8_RES) | 537 BIT(PERF_CSTATE_PKG_C9_RES) | 538 BIT(PERF_CSTATE_PKG_C10_RES), 539 }; 540 541 static const struct cstate_model cnl_cstates __initconst = { 542 .core_events = BIT(PERF_CSTATE_CORE_C1_RES) | 543 BIT(PERF_CSTATE_CORE_C3_RES) | 544 BIT(PERF_CSTATE_CORE_C6_RES) | 545 BIT(PERF_CSTATE_CORE_C7_RES), 546 547 .pkg_events = BIT(PERF_CSTATE_PKG_C2_RES) | 548 BIT(PERF_CSTATE_PKG_C3_RES) | 549 BIT(PERF_CSTATE_PKG_C6_RES) | 550 BIT(PERF_CSTATE_PKG_C7_RES) | 551 BIT(PERF_CSTATE_PKG_C8_RES) | 552 BIT(PERF_CSTATE_PKG_C9_RES) | 553 BIT(PERF_CSTATE_PKG_C10_RES), 554 }; 555 556 static const struct cstate_model icl_cstates __initconst = { 557 .core_events = BIT(PERF_CSTATE_CORE_C6_RES) | 558 BIT(PERF_CSTATE_CORE_C7_RES), 559 560 .pkg_events = BIT(PERF_CSTATE_PKG_C2_RES) | 561 BIT(PERF_CSTATE_PKG_C3_RES) | 562 BIT(PERF_CSTATE_PKG_C6_RES) | 563 BIT(PERF_CSTATE_PKG_C7_RES) | 564 BIT(PERF_CSTATE_PKG_C8_RES) | 565 BIT(PERF_CSTATE_PKG_C9_RES) | 566 BIT(PERF_CSTATE_PKG_C10_RES), 567 }; 568 569 static const struct cstate_model adl_cstates __initconst = { 570 .core_events = BIT(PERF_CSTATE_CORE_C1_RES) | 571 BIT(PERF_CSTATE_CORE_C6_RES) | 572 BIT(PERF_CSTATE_CORE_C7_RES), 573 574 .pkg_events = BIT(PERF_CSTATE_PKG_C2_RES) | 575 BIT(PERF_CSTATE_PKG_C3_RES) | 576 BIT(PERF_CSTATE_PKG_C6_RES) | 577 BIT(PERF_CSTATE_PKG_C7_RES) | 578 BIT(PERF_CSTATE_PKG_C8_RES) | 579 BIT(PERF_CSTATE_PKG_C9_RES) | 580 BIT(PERF_CSTATE_PKG_C10_RES), 581 }; 582 583 static const struct cstate_model slm_cstates __initconst = { 584 .core_events = BIT(PERF_CSTATE_CORE_C1_RES) | 585 BIT(PERF_CSTATE_CORE_C6_RES), 586 587 .pkg_events = BIT(PERF_CSTATE_PKG_C6_RES), 588 .quirks = SLM_PKG_C6_USE_C7_MSR, 589 }; 590 591 592 static const struct cstate_model knl_cstates __initconst = { 593 .core_events = BIT(PERF_CSTATE_CORE_C6_RES), 594 595 .pkg_events = BIT(PERF_CSTATE_PKG_C2_RES) | 596 BIT(PERF_CSTATE_PKG_C3_RES) | 597 BIT(PERF_CSTATE_PKG_C6_RES), 598 .quirks = KNL_CORE_C6_MSR, 599 }; 600 601 602 static const struct cstate_model glm_cstates __initconst = { 603 .core_events = BIT(PERF_CSTATE_CORE_C1_RES) | 604 BIT(PERF_CSTATE_CORE_C3_RES) | 605 BIT(PERF_CSTATE_CORE_C6_RES), 606 607 .pkg_events = BIT(PERF_CSTATE_PKG_C2_RES) | 608 BIT(PERF_CSTATE_PKG_C3_RES) | 609 BIT(PERF_CSTATE_PKG_C6_RES) | 610 BIT(PERF_CSTATE_PKG_C10_RES), 611 }; 612 613 614 static const struct x86_cpu_id intel_cstates_match[] __initconst = { 615 X86_MATCH_INTEL_FAM6_MODEL(NEHALEM, &nhm_cstates), 616 X86_MATCH_INTEL_FAM6_MODEL(NEHALEM_EP, &nhm_cstates), 617 X86_MATCH_INTEL_FAM6_MODEL(NEHALEM_EX, &nhm_cstates), 618 619 X86_MATCH_INTEL_FAM6_MODEL(WESTMERE, &nhm_cstates), 620 X86_MATCH_INTEL_FAM6_MODEL(WESTMERE_EP, &nhm_cstates), 621 X86_MATCH_INTEL_FAM6_MODEL(WESTMERE_EX, &nhm_cstates), 622 623 X86_MATCH_INTEL_FAM6_MODEL(SANDYBRIDGE, &snb_cstates), 624 X86_MATCH_INTEL_FAM6_MODEL(SANDYBRIDGE_X, &snb_cstates), 625 626 X86_MATCH_INTEL_FAM6_MODEL(IVYBRIDGE, &snb_cstates), 627 X86_MATCH_INTEL_FAM6_MODEL(IVYBRIDGE_X, &snb_cstates), 628 629 X86_MATCH_INTEL_FAM6_MODEL(HASWELL, &snb_cstates), 630 X86_MATCH_INTEL_FAM6_MODEL(HASWELL_X, &snb_cstates), 631 X86_MATCH_INTEL_FAM6_MODEL(HASWELL_G, &snb_cstates), 632 633 X86_MATCH_INTEL_FAM6_MODEL(HASWELL_L, &hswult_cstates), 634 635 X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT, &slm_cstates), 636 X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT_D, &slm_cstates), 637 X86_MATCH_INTEL_FAM6_MODEL(ATOM_AIRMONT, &slm_cstates), 638 639 X86_MATCH_INTEL_FAM6_MODEL(BROADWELL, &snb_cstates), 640 X86_MATCH_INTEL_FAM6_MODEL(BROADWELL_D, &snb_cstates), 641 X86_MATCH_INTEL_FAM6_MODEL(BROADWELL_G, &snb_cstates), 642 X86_MATCH_INTEL_FAM6_MODEL(BROADWELL_X, &snb_cstates), 643 644 X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_L, &snb_cstates), 645 X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE, &snb_cstates), 646 X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_X, &snb_cstates), 647 648 X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE_L, &hswult_cstates), 649 X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE, &hswult_cstates), 650 X86_MATCH_INTEL_FAM6_MODEL(COMETLAKE_L, &hswult_cstates), 651 X86_MATCH_INTEL_FAM6_MODEL(COMETLAKE, &hswult_cstates), 652 653 X86_MATCH_INTEL_FAM6_MODEL(CANNONLAKE_L, &cnl_cstates), 654 655 X86_MATCH_INTEL_FAM6_MODEL(XEON_PHI_KNL, &knl_cstates), 656 X86_MATCH_INTEL_FAM6_MODEL(XEON_PHI_KNM, &knl_cstates), 657 658 X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT, &glm_cstates), 659 X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT_D, &glm_cstates), 660 X86_MATCH_INTEL_FAM6_MODEL(ATOM_GOLDMONT_PLUS, &glm_cstates), 661 X86_MATCH_INTEL_FAM6_MODEL(ATOM_TREMONT_D, &glm_cstates), 662 X86_MATCH_INTEL_FAM6_MODEL(ATOM_TREMONT, &glm_cstates), 663 X86_MATCH_INTEL_FAM6_MODEL(ATOM_TREMONT_L, &glm_cstates), 664 665 X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_L, &icl_cstates), 666 X86_MATCH_INTEL_FAM6_MODEL(ICELAKE, &icl_cstates), 667 X86_MATCH_INTEL_FAM6_MODEL(TIGERLAKE_L, &icl_cstates), 668 X86_MATCH_INTEL_FAM6_MODEL(TIGERLAKE, &icl_cstates), 669 X86_MATCH_INTEL_FAM6_MODEL(ROCKETLAKE, &icl_cstates), 670 X86_MATCH_INTEL_FAM6_MODEL(ALDERLAKE, &adl_cstates), 671 X86_MATCH_INTEL_FAM6_MODEL(ALDERLAKE_L, &adl_cstates), 672 { }, 673 }; 674 MODULE_DEVICE_TABLE(x86cpu, intel_cstates_match); 675 676 static int __init cstate_probe(const struct cstate_model *cm) 677 { 678 /* SLM has different MSR for PKG C6 */ 679 if (cm->quirks & SLM_PKG_C6_USE_C7_MSR) 680 pkg_msr[PERF_CSTATE_PKG_C6_RES].msr = MSR_PKG_C7_RESIDENCY; 681 682 /* KNL has different MSR for CORE C6 */ 683 if (cm->quirks & KNL_CORE_C6_MSR) 684 pkg_msr[PERF_CSTATE_CORE_C6_RES].msr = MSR_KNL_CORE_C6_RESIDENCY; 685 686 687 core_msr_mask = perf_msr_probe(core_msr, PERF_CSTATE_CORE_EVENT_MAX, 688 true, (void *) &cm->core_events); 689 690 pkg_msr_mask = perf_msr_probe(pkg_msr, PERF_CSTATE_PKG_EVENT_MAX, 691 true, (void *) &cm->pkg_events); 692 693 has_cstate_core = !!core_msr_mask; 694 has_cstate_pkg = !!pkg_msr_mask; 695 696 return (has_cstate_core || has_cstate_pkg) ? 0 : -ENODEV; 697 } 698 699 static inline void cstate_cleanup(void) 700 { 701 cpuhp_remove_state_nocalls(CPUHP_AP_PERF_X86_CSTATE_ONLINE); 702 cpuhp_remove_state_nocalls(CPUHP_AP_PERF_X86_CSTATE_STARTING); 703 704 if (has_cstate_core) 705 perf_pmu_unregister(&cstate_core_pmu); 706 707 if (has_cstate_pkg) 708 perf_pmu_unregister(&cstate_pkg_pmu); 709 } 710 711 static int __init cstate_init(void) 712 { 713 int err; 714 715 cpuhp_setup_state(CPUHP_AP_PERF_X86_CSTATE_STARTING, 716 "perf/x86/cstate:starting", cstate_cpu_init, NULL); 717 cpuhp_setup_state(CPUHP_AP_PERF_X86_CSTATE_ONLINE, 718 "perf/x86/cstate:online", NULL, cstate_cpu_exit); 719 720 if (has_cstate_core) { 721 err = perf_pmu_register(&cstate_core_pmu, cstate_core_pmu.name, -1); 722 if (err) { 723 has_cstate_core = false; 724 pr_info("Failed to register cstate core pmu\n"); 725 cstate_cleanup(); 726 return err; 727 } 728 } 729 730 if (has_cstate_pkg) { 731 if (topology_max_die_per_package() > 1) { 732 err = perf_pmu_register(&cstate_pkg_pmu, 733 "cstate_die", -1); 734 } else { 735 err = perf_pmu_register(&cstate_pkg_pmu, 736 cstate_pkg_pmu.name, -1); 737 } 738 if (err) { 739 has_cstate_pkg = false; 740 pr_info("Failed to register cstate pkg pmu\n"); 741 cstate_cleanup(); 742 return err; 743 } 744 } 745 return 0; 746 } 747 748 static int __init cstate_pmu_init(void) 749 { 750 const struct x86_cpu_id *id; 751 int err; 752 753 if (boot_cpu_has(X86_FEATURE_HYPERVISOR)) 754 return -ENODEV; 755 756 id = x86_match_cpu(intel_cstates_match); 757 if (!id) 758 return -ENODEV; 759 760 err = cstate_probe((const struct cstate_model *) id->driver_data); 761 if (err) 762 return err; 763 764 return cstate_init(); 765 } 766 module_init(cstate_pmu_init); 767 768 static void __exit cstate_pmu_exit(void) 769 { 770 cstate_cleanup(); 771 } 772 module_exit(cstate_pmu_exit); 773