arch/x86/events/intel/cstate.c

   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
  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  *                             Scope: Core
  49  *      MSR_CORE_C6_RESIDENCY: CORE C6 Residency Counter
  50  *                             perf code: 0x02
  51  *                             Available model: SLM,AMT,NHM,WSM,SNB,IVB,HSW,BDW
  52  *                                              SKL,KNL,GLM
  53  *                             Scope: Core
  54  *      MSR_CORE_C7_RESIDENCY: CORE C7 Residency Counter
  55  *                             perf code: 0x03
  56  *                             Available model: SNB,IVB,HSW,BDW,SKL
  57  *                             Scope: Core
  58  *      MSR_PKG_C2_RESIDENCY:  Package C2 Residency Counter.
  59  *                             perf code: 0x00
  60  *                             Available model: SNB,IVB,HSW,BDW,SKL,KNL,GLM
  61  *                             Scope: Package (physical package)
  62  *      MSR_PKG_C3_RESIDENCY:  Package C3 Residency Counter.
  63  *                             perf code: 0x01
  64  *                             Available model: NHM,WSM,SNB,IVB,HSW,BDW,SKL,KNL
  65  *                                              GLM
  66  *                             Scope: Package (physical package)
  67  *      MSR_PKG_C6_RESIDENCY:  Package C6 Residency Counter.
  68  *                             perf code: 0x02
  69  *                             Available model: SLM,AMT,NHM,WSM,SNB,IVB,HSW,BDW
  70  *                                              SKL,KNL,GLM
  71  *                             Scope: Package (physical package)
  72  *      MSR_PKG_C7_RESIDENCY:  Package C7 Residency Counter.
  73  *                             perf code: 0x03
  74  *                             Available model: NHM,WSM,SNB,IVB,HSW,BDW,SKL
  75  *                             Scope: Package (physical package)
  76  *      MSR_PKG_C8_RESIDENCY:  Package C8 Residency Counter.
  77  *                             perf code: 0x04
  78  *                             Available model: HSW ULT only
  79  *                             Scope: Package (physical package)
  80  *      MSR_PKG_C9_RESIDENCY:  Package C9 Residency Counter.
  81  *                             perf code: 0x05
  82  *                             Available model: HSW ULT only
  83  *                             Scope: Package (physical package)
  84  *      MSR_PKG_C10_RESIDENCY: Package C10 Residency Counter.
  85  *                             perf code: 0x06
  86  *                             Available model: HSW ULT, GLM
  87  *                             Scope: Package (physical package)
  88  *
  89  */
  90
  91 #include <linux/module.h>
  92 #include <linux/slab.h>
  93 #include <linux/perf_event.h>
  94 #include <asm/cpu_device_id.h>
  95 #include <asm/intel-family.h>
  96 #include "../perf_event.h"
  97
  98 MODULE_LICENSE("GPL");
  99
 100 #define DEFINE_CSTATE_FORMAT_ATTR(_var, _name, _format)         \
 101 static ssize_t __cstate_##_var##_show(struct kobject *kobj,     \
 102                                 struct kobj_attribute *attr,    \
 103                                 char *page)                     \
 104 {                                                               \
 105         BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE);             \
 106         return sprintf(page, _format "\n");                     \
 107 }                                                               \
 108 static struct kobj_attribute format_attr_##_var =               \
 109         __ATTR(_name, 0444, __cstate_##_var##_show, NULL)
 110
 111 static ssize_t cstate_get_attr_cpumask(struct device *dev,
 112                                        struct device_attribute *attr,
 113                                        char *buf);
 114
 115 /* Model -> events mapping */
 116 struct cstate_model {
 117         unsigned long           core_events;
 118         unsigned long           pkg_events;
 119         unsigned long           quirks;
 120 };
 121
 122 /* Quirk flags */
 123 #define SLM_PKG_C6_USE_C7_MSR   (1UL << 0)
 124 #define KNL_CORE_C6_MSR         (1UL << 1)
 125
 126 struct perf_cstate_msr {
 127         u64     msr;
 128         struct  perf_pmu_events_attr *attr;
 129 };
 130
 131
 132 /* cstate_core PMU */
 133 static struct pmu cstate_core_pmu;
 134 static bool has_cstate_core;
 135
 136 enum perf_cstate_core_events {
 137         PERF_CSTATE_CORE_C1_RES = 0,
 138         PERF_CSTATE_CORE_C3_RES,
 139         PERF_CSTATE_CORE_C6_RES,
 140         PERF_CSTATE_CORE_C7_RES,
 141
 142         PERF_CSTATE_CORE_EVENT_MAX,
 143 };
 144
 145 PMU_EVENT_ATTR_STRING(c1-residency, evattr_cstate_core_c1, "event=0x00");
 146 PMU_EVENT_ATTR_STRING(c3-residency, evattr_cstate_core_c3, "event=0x01");
 147 PMU_EVENT_ATTR_STRING(c6-residency, evattr_cstate_core_c6, "event=0x02");
 148 PMU_EVENT_ATTR_STRING(c7-residency, evattr_cstate_core_c7, "event=0x03");
 149
 150 static struct perf_cstate_msr core_msr[] = {
 151         [PERF_CSTATE_CORE_C1_RES] = { MSR_CORE_C1_RES,          &evattr_cstate_core_c1 },
 152         [PERF_CSTATE_CORE_C3_RES] = { MSR_CORE_C3_RESIDENCY,    &evattr_cstate_core_c3 },
 153         [PERF_CSTATE_CORE_C6_RES] = { MSR_CORE_C6_RESIDENCY,    &evattr_cstate_core_c6 },
 154         [PERF_CSTATE_CORE_C7_RES] = { MSR_CORE_C7_RESIDENCY,    &evattr_cstate_core_c7 },
 155 };
 156
 157 static struct attribute *core_events_attrs[PERF_CSTATE_CORE_EVENT_MAX + 1] = {
 158         NULL,
 159 };
 160
 161 static struct attribute_group core_events_attr_group = {
 162         .name = "events",
 163         .attrs = core_events_attrs,
 164 };
 165
 166 DEFINE_CSTATE_FORMAT_ATTR(core_event, event, "config:0-63");
 167 static struct attribute *core_format_attrs[] = {
 168         &format_attr_core_event.attr,
 169         NULL,
 170 };
 171
 172 static struct attribute_group core_format_attr_group = {
 173         .name = "format",
 174         .attrs = core_format_attrs,
 175 };
 176
 177 static cpumask_t cstate_core_cpu_mask;
 178 static DEVICE_ATTR(cpumask, S_IRUGO, cstate_get_attr_cpumask, NULL);
 179
 180 static struct attribute *cstate_cpumask_attrs[] = {
 181         &dev_attr_cpumask.attr,
 182         NULL,
 183 };
 184
 185 static struct attribute_group cpumask_attr_group = {
 186         .attrs = cstate_cpumask_attrs,
 187 };
 188
 189 static const struct attribute_group *core_attr_groups[] = {
 190         &core_events_attr_group,
 191         &core_format_attr_group,
 192         &cpumask_attr_group,
 193         NULL,
 194 };
 195
 196 /* cstate_pkg PMU */
 197 static struct pmu cstate_pkg_pmu;
 198 static bool has_cstate_pkg;
 199
 200 enum perf_cstate_pkg_events {
 201         PERF_CSTATE_PKG_C2_RES = 0,
 202         PERF_CSTATE_PKG_C3_RES,
 203         PERF_CSTATE_PKG_C6_RES,
 204         PERF_CSTATE_PKG_C7_RES,
 205         PERF_CSTATE_PKG_C8_RES,
 206         PERF_CSTATE_PKG_C9_RES,
 207         PERF_CSTATE_PKG_C10_RES,
 208
 209         PERF_CSTATE_PKG_EVENT_MAX,
 210 };
 211
 212 PMU_EVENT_ATTR_STRING(c2-residency, evattr_cstate_pkg_c2, "event=0x00");
 213 PMU_EVENT_ATTR_STRING(c3-residency, evattr_cstate_pkg_c3, "event=0x01");
 214 PMU_EVENT_ATTR_STRING(c6-residency, evattr_cstate_pkg_c6, "event=0x02");
 215 PMU_EVENT_ATTR_STRING(c7-residency, evattr_cstate_pkg_c7, "event=0x03");
 216 PMU_EVENT_ATTR_STRING(c8-residency, evattr_cstate_pkg_c8, "event=0x04");
 217 PMU_EVENT_ATTR_STRING(c9-residency, evattr_cstate_pkg_c9, "event=0x05");
 218 PMU_EVENT_ATTR_STRING(c10-residency, evattr_cstate_pkg_c10, "event=0x06");
 219
 220 static struct perf_cstate_msr pkg_msr[] = {
 221         [PERF_CSTATE_PKG_C2_RES] = { MSR_PKG_C2_RESIDENCY,      &evattr_cstate_pkg_c2 },
 222         [PERF_CSTATE_PKG_C3_RES] = { MSR_PKG_C3_RESIDENCY,      &evattr_cstate_pkg_c3 },
 223         [PERF_CSTATE_PKG_C6_RES] = { MSR_PKG_C6_RESIDENCY,      &evattr_cstate_pkg_c6 },
 224         [PERF_CSTATE_PKG_C7_RES] = { MSR_PKG_C7_RESIDENCY,      &evattr_cstate_pkg_c7 },
 225         [PERF_CSTATE_PKG_C8_RES] = { MSR_PKG_C8_RESIDENCY,      &evattr_cstate_pkg_c8 },
 226         [PERF_CSTATE_PKG_C9_RES] = { MSR_PKG_C9_RESIDENCY,      &evattr_cstate_pkg_c9 },
 227         [PERF_CSTATE_PKG_C10_RES] = { MSR_PKG_C10_RESIDENCY,    &evattr_cstate_pkg_c10 },
 228 };
 229
 230 static struct attribute *pkg_events_attrs[PERF_CSTATE_PKG_EVENT_MAX + 1] = {
 231         NULL,
 232 };
 233
 234 static struct attribute_group pkg_events_attr_group = {
 235         .name = "events",
 236         .attrs = pkg_events_attrs,
 237 };
 238
 239 DEFINE_CSTATE_FORMAT_ATTR(pkg_event, event, "config:0-63");
 240 static struct attribute *pkg_format_attrs[] = {
 241         &format_attr_pkg_event.attr,
 242         NULL,
 243 };
 244 static struct attribute_group pkg_format_attr_group = {
 245         .name = "format",
 246         .attrs = pkg_format_attrs,
 247 };
 248
 249 static cpumask_t cstate_pkg_cpu_mask;
 250
 251 static const struct attribute_group *pkg_attr_groups[] = {
 252         &pkg_events_attr_group,
 253         &pkg_format_attr_group,
 254         &cpumask_attr_group,
 255         NULL,
 256 };
 257
 258 static ssize_t cstate_get_attr_cpumask(struct device *dev,
 259                                        struct device_attribute *attr,
 260                                        char *buf)
 261 {
 262         struct pmu *pmu = dev_get_drvdata(dev);
 263
 264         if (pmu == &cstate_core_pmu)
 265                 return cpumap_print_to_pagebuf(true, buf, &cstate_core_cpu_mask);
 266         else if (pmu == &cstate_pkg_pmu)
 267                 return cpumap_print_to_pagebuf(true, buf, &cstate_pkg_cpu_mask);
 268         else
 269                 return 0;
 270 }
 271
 272 static int cstate_pmu_event_init(struct perf_event *event)
 273 {
 274         u64 cfg = event->attr.config;
 275         int cpu;
 276
 277         if (event->attr.type != event->pmu->type)
 278                 return -ENOENT;
 279
 280         /* unsupported modes and filters */
 281         if (event->attr.exclude_user   ||
 282             event->attr.exclude_kernel ||
 283             event->attr.exclude_hv     ||
 284             event->attr.exclude_idle   ||
 285             event->attr.exclude_host   ||
 286             event->attr.exclude_guest  ||
 287             event->attr.sample_period) /* no sampling */
 288                 return -EINVAL;
 289
 290         if (event->cpu < 0)
 291                 return -EINVAL;
 292
 293         if (event->pmu == &cstate_core_pmu) {
 294                 if (cfg >= PERF_CSTATE_CORE_EVENT_MAX)
 295                         return -EINVAL;
 296                 if (!core_msr[cfg].attr)
 297                         return -EINVAL;
 298                 event->hw.event_base = core_msr[cfg].msr;
 299                 cpu = cpumask_any_and(&cstate_core_cpu_mask,
 300                                       topology_sibling_cpumask(event->cpu));
 301         } else if (event->pmu == &cstate_pkg_pmu) {
 302                 if (cfg >= PERF_CSTATE_PKG_EVENT_MAX)
 303                         return -EINVAL;
 304                 if (!pkg_msr[cfg].attr)
 305                         return -EINVAL;
 306                 event->hw.event_base = pkg_msr[cfg].msr;
 307                 cpu = cpumask_any_and(&cstate_pkg_cpu_mask,
 308                                       topology_core_cpumask(event->cpu));
 309         } else {
 310                 return -ENOENT;
 311         }
 312
 313         if (cpu >= nr_cpu_ids)
 314                 return -ENODEV;
 315
 316         event->cpu = cpu;
 317         event->hw.config = cfg;
 318         event->hw.idx = -1;
 319         return 0;
 320 }
 321
 322 static inline u64 cstate_pmu_read_counter(struct perf_event *event)
 323 {
 324         u64 val;
 325
 326         rdmsrl(event->hw.event_base, val);
 327         return val;
 328 }
 329
 330 static void cstate_pmu_event_update(struct perf_event *event)
 331 {
 332         struct hw_perf_event *hwc = &event->hw;
 333         u64 prev_raw_count, new_raw_count;
 334
 335 again:
 336         prev_raw_count = local64_read(&hwc->prev_count);
 337         new_raw_count = cstate_pmu_read_counter(event);
 338
 339         if (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
 340                             new_raw_count) != prev_raw_count)
 341                 goto again;
 342
 343         local64_add(new_raw_count - prev_raw_count, &event->count);
 344 }
 345
 346 static void cstate_pmu_event_start(struct perf_event *event, int mode)
 347 {
 348         local64_set(&event->hw.prev_count, cstate_pmu_read_counter(event));
 349 }
 350
 351 static void cstate_pmu_event_stop(struct perf_event *event, int mode)
 352 {
 353         cstate_pmu_event_update(event);
 354 }
 355
 356 static void cstate_pmu_event_del(struct perf_event *event, int mode)
 357 {
 358         cstate_pmu_event_stop(event, PERF_EF_UPDATE);
 359 }
 360
 361 static int cstate_pmu_event_add(struct perf_event *event, int mode)
 362 {
 363         if (mode & PERF_EF_START)
 364                 cstate_pmu_event_start(event, mode);
 365
 366         return 0;
 367 }
 368
 369 /*
 370  * Check if exiting cpu is the designated reader. If so migrate the
 371  * events when there is a valid target available
 372  */
 373 static int cstate_cpu_exit(unsigned int cpu)
 374 {
 375         unsigned int target;
 376
 377         if (has_cstate_core &&
 378             cpumask_test_and_clear_cpu(cpu, &cstate_core_cpu_mask)) {
 379
 380                 target = cpumask_any_but(topology_sibling_cpumask(cpu), cpu);
 381                 /* Migrate events if there is a valid target */
 382                 if (target < nr_cpu_ids) {
 383                         cpumask_set_cpu(target, &cstate_core_cpu_mask);
 384                         perf_pmu_migrate_context(&cstate_core_pmu, cpu, target);
 385                 }
 386         }
 387
 388         if (has_cstate_pkg &&
 389             cpumask_test_and_clear_cpu(cpu, &cstate_pkg_cpu_mask)) {
 390
 391                 target = cpumask_any_but(topology_core_cpumask(cpu), cpu);
 392                 /* Migrate events if there is a valid target */
 393                 if (target < nr_cpu_ids) {
 394                         cpumask_set_cpu(target, &cstate_pkg_cpu_mask);
 395                         perf_pmu_migrate_context(&cstate_pkg_pmu, cpu, target);
 396                 }
 397         }
 398         return 0;
 399 }
 400
 401 static int cstate_cpu_init(unsigned int cpu)
 402 {
 403         unsigned int target;
 404
 405         /*
 406          * If this is the first online thread of that core, set it in
 407          * the core cpu mask as the designated reader.
 408          */
 409         target = cpumask_any_and(&cstate_core_cpu_mask,
 410                                  topology_sibling_cpumask(cpu));
 411
 412         if (has_cstate_core && target >= nr_cpu_ids)
 413                 cpumask_set_cpu(cpu, &cstate_core_cpu_mask);
 414
 415         /*
 416          * If this is the first online thread of that package, set it
 417          * in the package cpu mask as the designated reader.
 418          */
 419         target = cpumask_any_and(&cstate_pkg_cpu_mask,
 420                                  topology_core_cpumask(cpu));
 421         if (has_cstate_pkg && target >= nr_cpu_ids)
 422                 cpumask_set_cpu(cpu, &cstate_pkg_cpu_mask);
 423
 424         return 0;
 425 }
 426
 427 static struct pmu cstate_core_pmu = {
 428         .attr_groups    = core_attr_groups,
 429         .name           = "cstate_core",
 430         .task_ctx_nr    = perf_invalid_context,
 431         .event_init     = cstate_pmu_event_init,
 432         .add            = cstate_pmu_event_add,
 433         .del            = cstate_pmu_event_del,
 434         .start          = cstate_pmu_event_start,
 435         .stop           = cstate_pmu_event_stop,
 436         .read           = cstate_pmu_event_update,
 437         .capabilities   = PERF_PMU_CAP_NO_INTERRUPT,
 438         .module         = THIS_MODULE,
 439 };
 440
 441 static struct pmu cstate_pkg_pmu = {
 442         .attr_groups    = pkg_attr_groups,
 443         .name           = "cstate_pkg",
 444         .task_ctx_nr    = perf_invalid_context,
 445         .event_init     = cstate_pmu_event_init,
 446         .add            = cstate_pmu_event_add,
 447         .del            = cstate_pmu_event_del,
 448         .start          = cstate_pmu_event_start,
 449         .stop           = cstate_pmu_event_stop,
 450         .read           = cstate_pmu_event_update,
 451         .capabilities   = PERF_PMU_CAP_NO_INTERRUPT,
 452         .module         = THIS_MODULE,
 453 };
 454
 455 static const struct cstate_model nhm_cstates __initconst = {
 456         .core_events            = BIT(PERF_CSTATE_CORE_C3_RES) |
 457                                   BIT(PERF_CSTATE_CORE_C6_RES),
 458
 459         .pkg_events             = BIT(PERF_CSTATE_PKG_C3_RES) |
 460                                   BIT(PERF_CSTATE_PKG_C6_RES) |
 461                                   BIT(PERF_CSTATE_PKG_C7_RES),
 462 };
 463
 464 static const struct cstate_model snb_cstates __initconst = {
 465         .core_events            = BIT(PERF_CSTATE_CORE_C3_RES) |
 466                                   BIT(PERF_CSTATE_CORE_C6_RES) |
 467                                   BIT(PERF_CSTATE_CORE_C7_RES),
 468
 469         .pkg_events             = BIT(PERF_CSTATE_PKG_C2_RES) |
 470                                   BIT(PERF_CSTATE_PKG_C3_RES) |
 471                                   BIT(PERF_CSTATE_PKG_C6_RES) |
 472                                   BIT(PERF_CSTATE_PKG_C7_RES),
 473 };
 474
 475 static const struct cstate_model hswult_cstates __initconst = {
 476         .core_events            = BIT(PERF_CSTATE_CORE_C3_RES) |
 477                                   BIT(PERF_CSTATE_CORE_C6_RES) |
 478                                   BIT(PERF_CSTATE_CORE_C7_RES),
 479
 480         .pkg_events             = BIT(PERF_CSTATE_PKG_C2_RES) |
 481                                   BIT(PERF_CSTATE_PKG_C3_RES) |
 482                                   BIT(PERF_CSTATE_PKG_C6_RES) |
 483                                   BIT(PERF_CSTATE_PKG_C7_RES) |
 484                                   BIT(PERF_CSTATE_PKG_C8_RES) |
 485                                   BIT(PERF_CSTATE_PKG_C9_RES) |
 486                                   BIT(PERF_CSTATE_PKG_C10_RES),
 487 };
 488
 489 static const struct cstate_model slm_cstates __initconst = {
 490         .core_events            = BIT(PERF_CSTATE_CORE_C1_RES) |
 491                                   BIT(PERF_CSTATE_CORE_C6_RES),
 492
 493         .pkg_events             = BIT(PERF_CSTATE_PKG_C6_RES),
 494         .quirks                 = SLM_PKG_C6_USE_C7_MSR,
 495 };
 496
 497
 498 static const struct cstate_model knl_cstates __initconst = {
 499         .core_events            = BIT(PERF_CSTATE_CORE_C6_RES),
 500
 501         .pkg_events             = BIT(PERF_CSTATE_PKG_C2_RES) |
 502                                   BIT(PERF_CSTATE_PKG_C3_RES) |
 503                                   BIT(PERF_CSTATE_PKG_C6_RES),
 504         .quirks                 = KNL_CORE_C6_MSR,
 505 };
 506
 507
 508 static const struct cstate_model glm_cstates __initconst = {
 509         .core_events            = BIT(PERF_CSTATE_CORE_C1_RES) |
 510                                   BIT(PERF_CSTATE_CORE_C3_RES) |
 511                                   BIT(PERF_CSTATE_CORE_C6_RES),
 512
 513         .pkg_events             = BIT(PERF_CSTATE_PKG_C2_RES) |
 514                                   BIT(PERF_CSTATE_PKG_C3_RES) |
 515                                   BIT(PERF_CSTATE_PKG_C6_RES) |
 516                                   BIT(PERF_CSTATE_PKG_C10_RES),
 517 };
 518
 519
 520 #define X86_CSTATES_MODEL(model, states)                                \
 521         { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, (unsigned long) &(states) }
 522
 523 static const struct x86_cpu_id intel_cstates_match[] __initconst = {
 524         X86_CSTATES_MODEL(INTEL_FAM6_NEHALEM,    nhm_cstates),
 525         X86_CSTATES_MODEL(INTEL_FAM6_NEHALEM_EP, nhm_cstates),
 526         X86_CSTATES_MODEL(INTEL_FAM6_NEHALEM_EX, nhm_cstates),
 527
 528         X86_CSTATES_MODEL(INTEL_FAM6_WESTMERE,    nhm_cstates),
 529         X86_CSTATES_MODEL(INTEL_FAM6_WESTMERE_EP, nhm_cstates),
 530         X86_CSTATES_MODEL(INTEL_FAM6_WESTMERE_EX, nhm_cstates),
 531
 532         X86_CSTATES_MODEL(INTEL_FAM6_SANDYBRIDGE,   snb_cstates),
 533         X86_CSTATES_MODEL(INTEL_FAM6_SANDYBRIDGE_X, snb_cstates),
 534
 535         X86_CSTATES_MODEL(INTEL_FAM6_IVYBRIDGE,   snb_cstates),
 536         X86_CSTATES_MODEL(INTEL_FAM6_IVYBRIDGE_X, snb_cstates),
 537
 538         X86_CSTATES_MODEL(INTEL_FAM6_HASWELL_CORE, snb_cstates),
 539         X86_CSTATES_MODEL(INTEL_FAM6_HASWELL_X,    snb_cstates),
 540         X86_CSTATES_MODEL(INTEL_FAM6_HASWELL_GT3E, snb_cstates),
 541
 542         X86_CSTATES_MODEL(INTEL_FAM6_HASWELL_ULT, hswult_cstates),
 543
 544         X86_CSTATES_MODEL(INTEL_FAM6_ATOM_SILVERMONT1, slm_cstates),
 545         X86_CSTATES_MODEL(INTEL_FAM6_ATOM_SILVERMONT2, slm_cstates),
 546         X86_CSTATES_MODEL(INTEL_FAM6_ATOM_AIRMONT,     slm_cstates),
 547
 548         X86_CSTATES_MODEL(INTEL_FAM6_BROADWELL_CORE,   snb_cstates),
 549         X86_CSTATES_MODEL(INTEL_FAM6_BROADWELL_XEON_D, snb_cstates),
 550         X86_CSTATES_MODEL(INTEL_FAM6_BROADWELL_GT3E,   snb_cstates),
 551         X86_CSTATES_MODEL(INTEL_FAM6_BROADWELL_X,      snb_cstates),
 552
 553         X86_CSTATES_MODEL(INTEL_FAM6_SKYLAKE_MOBILE,  snb_cstates),
 554         X86_CSTATES_MODEL(INTEL_FAM6_SKYLAKE_DESKTOP, snb_cstates),
 555
 556         X86_CSTATES_MODEL(INTEL_FAM6_KABYLAKE_MOBILE,  snb_cstates),
 557         X86_CSTATES_MODEL(INTEL_FAM6_KABYLAKE_DESKTOP, snb_cstates),
 558
 559         X86_CSTATES_MODEL(INTEL_FAM6_XEON_PHI_KNL, knl_cstates),
 560         X86_CSTATES_MODEL(INTEL_FAM6_XEON_PHI_KNM, knl_cstates),
 561
 562         X86_CSTATES_MODEL(INTEL_FAM6_ATOM_GOLDMONT, glm_cstates),
 563         { },
 564 };
 565 MODULE_DEVICE_TABLE(x86cpu, intel_cstates_match);
 566
 567 /*
 568  * Probe the cstate events and insert the available one into sysfs attrs
 569  * Return false if there are no available events.
 570  */
 571 static bool __init cstate_probe_msr(const unsigned long evmsk, int max,
 572                                    struct perf_cstate_msr *msr,
 573                                    struct attribute **attrs)
 574 {
 575         bool found = false;
 576         unsigned int bit;
 577         u64 val;
 578
 579         for (bit = 0; bit < max; bit++) {
 580                 if (test_bit(bit, &evmsk) && !rdmsrl_safe(msr[bit].msr, &val)) {
 581                         *attrs++ = &msr[bit].attr->attr.attr;
 582                         found = true;
 583                 } else {
 584                         msr[bit].attr = NULL;
 585                 }
 586         }
 587         *attrs = NULL;
 588
 589         return found;
 590 }
 591
 592 static int __init cstate_probe(const struct cstate_model *cm)
 593 {
 594         /* SLM has different MSR for PKG C6 */
 595         if (cm->quirks & SLM_PKG_C6_USE_C7_MSR)
 596                 pkg_msr[PERF_CSTATE_PKG_C6_RES].msr = MSR_PKG_C7_RESIDENCY;
 597
 598         /* KNL has different MSR for CORE C6 */
 599         if (cm->quirks & KNL_CORE_C6_MSR)
 600                 pkg_msr[PERF_CSTATE_CORE_C6_RES].msr = MSR_KNL_CORE_C6_RESIDENCY;
 601
 602
 603         has_cstate_core = cstate_probe_msr(cm->core_events,
 604                                            PERF_CSTATE_CORE_EVENT_MAX,
 605                                            core_msr, core_events_attrs);
 606
 607         has_cstate_pkg = cstate_probe_msr(cm->pkg_events,
 608                                           PERF_CSTATE_PKG_EVENT_MAX,
 609                                           pkg_msr, pkg_events_attrs);
 610
 611         return (has_cstate_core || has_cstate_pkg) ? 0 : -ENODEV;
 612 }
 613
 614 static inline void cstate_cleanup(void)
 615 {
 616         cpuhp_remove_state_nocalls(CPUHP_AP_PERF_X86_CSTATE_ONLINE);
 617         cpuhp_remove_state_nocalls(CPUHP_AP_PERF_X86_CSTATE_STARTING);
 618
 619         if (has_cstate_core)
 620                 perf_pmu_unregister(&cstate_core_pmu);
 621
 622         if (has_cstate_pkg)
 623                 perf_pmu_unregister(&cstate_pkg_pmu);
 624 }
 625
 626 static int __init cstate_init(void)
 627 {
 628         int err;
 629
 630         cpuhp_setup_state(CPUHP_AP_PERF_X86_CSTATE_STARTING,
 631                           "perf/x86/cstate:starting", cstate_cpu_init, NULL);
 632         cpuhp_setup_state(CPUHP_AP_PERF_X86_CSTATE_ONLINE,
 633                           "perf/x86/cstate:online", NULL, cstate_cpu_exit);
 634
 635         if (has_cstate_core) {
 636                 err = perf_pmu_register(&cstate_core_pmu, cstate_core_pmu.name, -1);
 637                 if (err) {
 638                         has_cstate_core = false;
 639                         pr_info("Failed to register cstate core pmu\n");
 640                         cstate_cleanup();
 641                         return err;
 642                 }
 643         }
 644
 645         if (has_cstate_pkg) {
 646                 err = perf_pmu_register(&cstate_pkg_pmu, cstate_pkg_pmu.name, -1);
 647                 if (err) {
 648                         has_cstate_pkg = false;
 649                         pr_info("Failed to register cstate pkg pmu\n");
 650                         cstate_cleanup();
 651                         return err;
 652                 }
 653         }
 654         return 0;
 655 }
 656
 657 static int __init cstate_pmu_init(void)
 658 {
 659         const struct x86_cpu_id *id;
 660         int err;
 661
 662         if (boot_cpu_has(X86_FEATURE_HYPERVISOR))
 663                 return -ENODEV;
 664
 665         id = x86_match_cpu(intel_cstates_match);
 666         if (!id)
 667                 return -ENODEV;
 668
 669         err = cstate_probe((const struct cstate_model *) id->driver_data);
 670         if (err)
 671                 return err;
 672
 673         return cstate_init();
 674 }
 675 module_init(cstate_pmu_init);
 676
 677 static void __exit cstate_pmu_exit(void)
 678 {
 679         cstate_cleanup();
 680 }
 681 module_exit(cstate_pmu_exit);