arch/x86/events/intel/cstate.c

   1 /*
   2  * perf_event_intel_cstate.c: 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
  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
  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,SKL
  52  *                             Scope: Core
  53  *      MSR_CORE_C7_RESIDENCY: CORE C7 Residency Counter
  54  *                             perf code: 0x03
  55  *                             Available model: SNB,IVB,HSW,BDW,SKL
  56  *                             Scope: Core
  57  *      MSR_PKG_C2_RESIDENCY:  Package C2 Residency Counter.
  58  *                             perf code: 0x00
  59  *                             Available model: SNB,IVB,HSW,BDW,SKL
  60  *                             Scope: Package (physical package)
  61  *      MSR_PKG_C3_RESIDENCY:  Package C3 Residency Counter.
  62  *                             perf code: 0x01
  63  *                             Available model: NHM,WSM,SNB,IVB,HSW,BDW,SKL
  64  *                             Scope: Package (physical package)
  65  *      MSR_PKG_C6_RESIDENCY:  Package C6 Residency Counter.
  66  *                             perf code: 0x02
  67  *                             Available model: SLM,AMT,NHM,WSM,SNB,IVB,HSW,BDW,SKL
  68  *                             Scope: Package (physical package)
  69  *      MSR_PKG_C7_RESIDENCY:  Package C7 Residency Counter.
  70  *                             perf code: 0x03
  71  *                             Available model: NHM,WSM,SNB,IVB,HSW,BDW,SKL
  72  *                             Scope: Package (physical package)
  73  *      MSR_PKG_C8_RESIDENCY:  Package C8 Residency Counter.
  74  *                             perf code: 0x04
  75  *                             Available model: HSW ULT only
  76  *                             Scope: Package (physical package)
  77  *      MSR_PKG_C9_RESIDENCY:  Package C9 Residency Counter.
  78  *                             perf code: 0x05
  79  *                             Available model: HSW ULT only
  80  *                             Scope: Package (physical package)
  81  *      MSR_PKG_C10_RESIDENCY: Package C10 Residency Counter.
  82  *                             perf code: 0x06
  83  *                             Available model: HSW ULT only
  84  *                             Scope: Package (physical package)
  85  *
  86  */
  87
  88 #include <linux/module.h>
  89 #include <linux/slab.h>
  90 #include <linux/perf_event.h>
  91 #include <asm/cpu_device_id.h>
  92 #include <asm/intel-family.h>
  93 #include "../perf_event.h"
  94
  95 MODULE_LICENSE("GPL");
  96
  97 #define DEFINE_CSTATE_FORMAT_ATTR(_var, _name, _format)         \
  98 static ssize_t __cstate_##_var##_show(struct kobject *kobj,     \
  99                                 struct kobj_attribute *attr,    \
 100                                 char *page)                     \
 101 {                                                               \
 102         BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE);             \
 103         return sprintf(page, _format "\n");                     \
 104 }                                                               \
 105 static struct kobj_attribute format_attr_##_var =               \
 106         __ATTR(_name, 0444, __cstate_##_var##_show, NULL)
 107
 108 static ssize_t cstate_get_attr_cpumask(struct device *dev,
 109                                        struct device_attribute *attr,
 110                                        char *buf);
 111
 112 /* Model -> events mapping */
 113 struct cstate_model {
 114         unsigned long           core_events;
 115         unsigned long           pkg_events;
 116         unsigned long           quirks;
 117 };
 118
 119 /* Quirk flags */
 120 #define SLM_PKG_C6_USE_C7_MSR   (1UL << 0)
 121
 122 struct perf_cstate_msr {
 123         u64     msr;
 124         struct  perf_pmu_events_attr *attr;
 125 };
 126
 127
 128 /* cstate_core PMU */
 129 static struct pmu cstate_core_pmu;
 130 static bool has_cstate_core;
 131
 132 enum perf_cstate_core_events {
 133         PERF_CSTATE_CORE_C1_RES = 0,
 134         PERF_CSTATE_CORE_C3_RES,
 135         PERF_CSTATE_CORE_C6_RES,
 136         PERF_CSTATE_CORE_C7_RES,
 137
 138         PERF_CSTATE_CORE_EVENT_MAX,
 139 };
 140
 141 PMU_EVENT_ATTR_STRING(c1-residency, evattr_cstate_core_c1, "event=0x00");
 142 PMU_EVENT_ATTR_STRING(c3-residency, evattr_cstate_core_c3, "event=0x01");
 143 PMU_EVENT_ATTR_STRING(c6-residency, evattr_cstate_core_c6, "event=0x02");
 144 PMU_EVENT_ATTR_STRING(c7-residency, evattr_cstate_core_c7, "event=0x03");
 145
 146 static struct perf_cstate_msr core_msr[] = {
 147         [PERF_CSTATE_CORE_C1_RES] = { MSR_CORE_C1_RES,          &evattr_cstate_core_c1 },
 148         [PERF_CSTATE_CORE_C3_RES] = { MSR_CORE_C3_RESIDENCY,    &evattr_cstate_core_c3 },
 149         [PERF_CSTATE_CORE_C6_RES] = { MSR_CORE_C6_RESIDENCY,    &evattr_cstate_core_c6 },
 150         [PERF_CSTATE_CORE_C7_RES] = { MSR_CORE_C7_RESIDENCY,    &evattr_cstate_core_c7 },
 151 };
 152
 153 static struct attribute *core_events_attrs[PERF_CSTATE_CORE_EVENT_MAX + 1] = {
 154         NULL,
 155 };
 156
 157 static struct attribute_group core_events_attr_group = {
 158         .name = "events",
 159         .attrs = core_events_attrs,
 160 };
 161
 162 DEFINE_CSTATE_FORMAT_ATTR(core_event, event, "config:0-63");
 163 static struct attribute *core_format_attrs[] = {
 164         &format_attr_core_event.attr,
 165         NULL,
 166 };
 167
 168 static struct attribute_group core_format_attr_group = {
 169         .name = "format",
 170         .attrs = core_format_attrs,
 171 };
 172
 173 static cpumask_t cstate_core_cpu_mask;
 174 static DEVICE_ATTR(cpumask, S_IRUGO, cstate_get_attr_cpumask, NULL);
 175
 176 static struct attribute *cstate_cpumask_attrs[] = {
 177         &dev_attr_cpumask.attr,
 178         NULL,
 179 };
 180
 181 static struct attribute_group cpumask_attr_group = {
 182         .attrs = cstate_cpumask_attrs,
 183 };
 184
 185 static const struct attribute_group *core_attr_groups[] = {
 186         &core_events_attr_group,
 187         &core_format_attr_group,
 188         &cpumask_attr_group,
 189         NULL,
 190 };
 191
 192 /* cstate_pkg PMU */
 193 static struct pmu cstate_pkg_pmu;
 194 static bool has_cstate_pkg;
 195
 196 enum perf_cstate_pkg_events {
 197         PERF_CSTATE_PKG_C2_RES = 0,
 198         PERF_CSTATE_PKG_C3_RES,
 199         PERF_CSTATE_PKG_C6_RES,
 200         PERF_CSTATE_PKG_C7_RES,
 201         PERF_CSTATE_PKG_C8_RES,
 202         PERF_CSTATE_PKG_C9_RES,
 203         PERF_CSTATE_PKG_C10_RES,
 204
 205         PERF_CSTATE_PKG_EVENT_MAX,
 206 };
 207
 208 PMU_EVENT_ATTR_STRING(c2-residency, evattr_cstate_pkg_c2, "event=0x00");
 209 PMU_EVENT_ATTR_STRING(c3-residency, evattr_cstate_pkg_c3, "event=0x01");
 210 PMU_EVENT_ATTR_STRING(c6-residency, evattr_cstate_pkg_c6, "event=0x02");
 211 PMU_EVENT_ATTR_STRING(c7-residency, evattr_cstate_pkg_c7, "event=0x03");
 212 PMU_EVENT_ATTR_STRING(c8-residency, evattr_cstate_pkg_c8, "event=0x04");
 213 PMU_EVENT_ATTR_STRING(c9-residency, evattr_cstate_pkg_c9, "event=0x05");
 214 PMU_EVENT_ATTR_STRING(c10-residency, evattr_cstate_pkg_c10, "event=0x06");
 215
 216 static struct perf_cstate_msr pkg_msr[] = {
 217         [PERF_CSTATE_PKG_C2_RES] = { MSR_PKG_C2_RESIDENCY,      &evattr_cstate_pkg_c2 },
 218         [PERF_CSTATE_PKG_C3_RES] = { MSR_PKG_C3_RESIDENCY,      &evattr_cstate_pkg_c3 },
 219         [PERF_CSTATE_PKG_C6_RES] = { MSR_PKG_C6_RESIDENCY,      &evattr_cstate_pkg_c6 },
 220         [PERF_CSTATE_PKG_C7_RES] = { MSR_PKG_C7_RESIDENCY,      &evattr_cstate_pkg_c7 },
 221         [PERF_CSTATE_PKG_C8_RES] = { MSR_PKG_C8_RESIDENCY,      &evattr_cstate_pkg_c8 },
 222         [PERF_CSTATE_PKG_C9_RES] = { MSR_PKG_C9_RESIDENCY,      &evattr_cstate_pkg_c9 },
 223         [PERF_CSTATE_PKG_C10_RES] = { MSR_PKG_C10_RESIDENCY,    &evattr_cstate_pkg_c10 },
 224 };
 225
 226 static struct attribute *pkg_events_attrs[PERF_CSTATE_PKG_EVENT_MAX + 1] = {
 227         NULL,
 228 };
 229
 230 static struct attribute_group pkg_events_attr_group = {
 231         .name = "events",
 232         .attrs = pkg_events_attrs,
 233 };
 234
 235 DEFINE_CSTATE_FORMAT_ATTR(pkg_event, event, "config:0-63");
 236 static struct attribute *pkg_format_attrs[] = {
 237         &format_attr_pkg_event.attr,
 238         NULL,
 239 };
 240 static struct attribute_group pkg_format_attr_group = {
 241         .name = "format",
 242         .attrs = pkg_format_attrs,
 243 };
 244
 245 static cpumask_t cstate_pkg_cpu_mask;
 246
 247 static const struct attribute_group *pkg_attr_groups[] = {
 248         &pkg_events_attr_group,
 249         &pkg_format_attr_group,
 250         &cpumask_attr_group,
 251         NULL,
 252 };
 253
 254 static ssize_t cstate_get_attr_cpumask(struct device *dev,
 255                                        struct device_attribute *attr,
 256                                        char *buf)
 257 {
 258         struct pmu *pmu = dev_get_drvdata(dev);
 259
 260         if (pmu == &cstate_core_pmu)
 261                 return cpumap_print_to_pagebuf(true, buf, &cstate_core_cpu_mask);
 262         else if (pmu == &cstate_pkg_pmu)
 263                 return cpumap_print_to_pagebuf(true, buf, &cstate_pkg_cpu_mask);
 264         else
 265                 return 0;
 266 }
 267
 268 static int cstate_pmu_event_init(struct perf_event *event)
 269 {
 270         u64 cfg = event->attr.config;
 271         int cpu;
 272
 273         if (event->attr.type != event->pmu->type)
 274                 return -ENOENT;
 275
 276         /* unsupported modes and filters */
 277         if (event->attr.exclude_user   ||
 278             event->attr.exclude_kernel ||
 279             event->attr.exclude_hv     ||
 280             event->attr.exclude_idle   ||
 281             event->attr.exclude_host   ||
 282             event->attr.exclude_guest  ||
 283             event->attr.sample_period) /* no sampling */
 284                 return -EINVAL;
 285
 286         if (event->cpu < 0)
 287                 return -EINVAL;
 288
 289         if (event->pmu == &cstate_core_pmu) {
 290                 if (cfg >= PERF_CSTATE_CORE_EVENT_MAX)
 291                         return -EINVAL;
 292                 if (!core_msr[cfg].attr)
 293                         return -EINVAL;
 294                 event->hw.event_base = core_msr[cfg].msr;
 295                 cpu = cpumask_any_and(&cstate_core_cpu_mask,
 296                                       topology_sibling_cpumask(event->cpu));
 297         } else if (event->pmu == &cstate_pkg_pmu) {
 298                 if (cfg >= PERF_CSTATE_PKG_EVENT_MAX)
 299                         return -EINVAL;
 300                 if (!pkg_msr[cfg].attr)
 301                         return -EINVAL;
 302                 event->hw.event_base = pkg_msr[cfg].msr;
 303                 cpu = cpumask_any_and(&cstate_pkg_cpu_mask,
 304                                       topology_core_cpumask(event->cpu));
 305         } else {
 306                 return -ENOENT;
 307         }
 308
 309         if (cpu >= nr_cpu_ids)
 310                 return -ENODEV;
 311
 312         event->cpu = cpu;
 313         event->hw.config = cfg;
 314         event->hw.idx = -1;
 315         return 0;
 316 }
 317
 318 static inline u64 cstate_pmu_read_counter(struct perf_event *event)
 319 {
 320         u64 val;
 321
 322         rdmsrl(event->hw.event_base, val);
 323         return val;
 324 }
 325
 326 static void cstate_pmu_event_update(struct perf_event *event)
 327 {
 328         struct hw_perf_event *hwc = &event->hw;
 329         u64 prev_raw_count, new_raw_count;
 330
 331 again:
 332         prev_raw_count = local64_read(&hwc->prev_count);
 333         new_raw_count = cstate_pmu_read_counter(event);
 334
 335         if (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
 336                             new_raw_count) != prev_raw_count)
 337                 goto again;
 338
 339         local64_add(new_raw_count - prev_raw_count, &event->count);
 340 }
 341
 342 static void cstate_pmu_event_start(struct perf_event *event, int mode)
 343 {
 344         local64_set(&event->hw.prev_count, cstate_pmu_read_counter(event));
 345 }
 346
 347 static void cstate_pmu_event_stop(struct perf_event *event, int mode)
 348 {
 349         cstate_pmu_event_update(event);
 350 }
 351
 352 static void cstate_pmu_event_del(struct perf_event *event, int mode)
 353 {
 354         cstate_pmu_event_stop(event, PERF_EF_UPDATE);
 355 }
 356
 357 static int cstate_pmu_event_add(struct perf_event *event, int mode)
 358 {
 359         if (mode & PERF_EF_START)
 360                 cstate_pmu_event_start(event, mode);
 361
 362         return 0;
 363 }
 364
 365 /*
 366  * Check if exiting cpu is the designated reader. If so migrate the
 367  * events when there is a valid target available
 368  */
 369 static int cstate_cpu_exit(unsigned int cpu)
 370 {
 371         unsigned int target;
 372
 373         if (has_cstate_core &&
 374             cpumask_test_and_clear_cpu(cpu, &cstate_core_cpu_mask)) {
 375
 376                 target = cpumask_any_but(topology_sibling_cpumask(cpu), cpu);
 377                 /* Migrate events if there is a valid target */
 378                 if (target < nr_cpu_ids) {
 379                         cpumask_set_cpu(target, &cstate_core_cpu_mask);
 380                         perf_pmu_migrate_context(&cstate_core_pmu, cpu, target);
 381                 }
 382         }
 383
 384         if (has_cstate_pkg &&
 385             cpumask_test_and_clear_cpu(cpu, &cstate_pkg_cpu_mask)) {
 386
 387                 target = cpumask_any_but(topology_core_cpumask(cpu), cpu);
 388                 /* Migrate events if there is a valid target */
 389                 if (target < nr_cpu_ids) {
 390                         cpumask_set_cpu(target, &cstate_pkg_cpu_mask);
 391                         perf_pmu_migrate_context(&cstate_pkg_pmu, cpu, target);
 392                 }
 393         }
 394         return 0;
 395 }
 396
 397 static int cstate_cpu_init(unsigned int cpu)
 398 {
 399         unsigned int target;
 400
 401         /*
 402          * If this is the first online thread of that core, set it in
 403          * the core cpu mask as the designated reader.
 404          */
 405         target = cpumask_any_and(&cstate_core_cpu_mask,
 406                                  topology_sibling_cpumask(cpu));
 407
 408         if (has_cstate_core && target >= nr_cpu_ids)
 409                 cpumask_set_cpu(cpu, &cstate_core_cpu_mask);
 410
 411         /*
 412          * If this is the first online thread of that package, set it
 413          * in the package cpu mask as the designated reader.
 414          */
 415         target = cpumask_any_and(&cstate_pkg_cpu_mask,
 416                                  topology_core_cpumask(cpu));
 417         if (has_cstate_pkg && target >= nr_cpu_ids)
 418                 cpumask_set_cpu(cpu, &cstate_pkg_cpu_mask);
 419
 420         return 0;
 421 }
 422
 423 static struct pmu cstate_core_pmu = {
 424         .attr_groups    = core_attr_groups,
 425         .name           = "cstate_core",
 426         .task_ctx_nr    = perf_invalid_context,
 427         .event_init     = cstate_pmu_event_init,
 428         .add            = cstate_pmu_event_add,
 429         .del            = cstate_pmu_event_del,
 430         .start          = cstate_pmu_event_start,
 431         .stop           = cstate_pmu_event_stop,
 432         .read           = cstate_pmu_event_update,
 433         .capabilities   = PERF_PMU_CAP_NO_INTERRUPT,
 434 };
 435
 436 static struct pmu cstate_pkg_pmu = {
 437         .attr_groups    = pkg_attr_groups,
 438         .name           = "cstate_pkg",
 439         .task_ctx_nr    = perf_invalid_context,
 440         .event_init     = cstate_pmu_event_init,
 441         .add            = cstate_pmu_event_add,
 442         .del            = cstate_pmu_event_del,
 443         .start          = cstate_pmu_event_start,
 444         .stop           = cstate_pmu_event_stop,
 445         .read           = cstate_pmu_event_update,
 446         .capabilities   = PERF_PMU_CAP_NO_INTERRUPT,
 447 };
 448
 449 static const struct cstate_model nhm_cstates __initconst = {
 450         .core_events            = BIT(PERF_CSTATE_CORE_C3_RES) |
 451                                   BIT(PERF_CSTATE_CORE_C6_RES),
 452
 453         .pkg_events             = BIT(PERF_CSTATE_PKG_C3_RES) |
 454                                   BIT(PERF_CSTATE_PKG_C6_RES) |
 455                                   BIT(PERF_CSTATE_PKG_C7_RES),
 456 };
 457
 458 static const struct cstate_model snb_cstates __initconst = {
 459         .core_events            = BIT(PERF_CSTATE_CORE_C3_RES) |
 460                                   BIT(PERF_CSTATE_CORE_C6_RES) |
 461                                   BIT(PERF_CSTATE_CORE_C7_RES),
 462
 463         .pkg_events             = BIT(PERF_CSTATE_PKG_C2_RES) |
 464                                   BIT(PERF_CSTATE_PKG_C3_RES) |
 465                                   BIT(PERF_CSTATE_PKG_C6_RES) |
 466                                   BIT(PERF_CSTATE_PKG_C7_RES),
 467 };
 468
 469 static const struct cstate_model hswult_cstates __initconst = {
 470         .core_events            = BIT(PERF_CSTATE_CORE_C3_RES) |
 471                                   BIT(PERF_CSTATE_CORE_C6_RES) |
 472                                   BIT(PERF_CSTATE_CORE_C7_RES),
 473
 474         .pkg_events             = BIT(PERF_CSTATE_PKG_C2_RES) |
 475                                   BIT(PERF_CSTATE_PKG_C3_RES) |
 476                                   BIT(PERF_CSTATE_PKG_C6_RES) |
 477                                   BIT(PERF_CSTATE_PKG_C7_RES) |
 478                                   BIT(PERF_CSTATE_PKG_C8_RES) |
 479                                   BIT(PERF_CSTATE_PKG_C9_RES) |
 480                                   BIT(PERF_CSTATE_PKG_C10_RES),
 481 };
 482
 483 static const struct cstate_model slm_cstates __initconst = {
 484         .core_events            = BIT(PERF_CSTATE_CORE_C1_RES) |
 485                                   BIT(PERF_CSTATE_CORE_C6_RES),
 486
 487         .pkg_events             = BIT(PERF_CSTATE_PKG_C6_RES),
 488         .quirks                 = SLM_PKG_C6_USE_C7_MSR,
 489 };
 490
 491 #define X86_CSTATES_MODEL(model, states)                                \
 492         { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, (unsigned long) &(states) }
 493
 494 static const struct x86_cpu_id intel_cstates_match[] __initconst = {
 495         X86_CSTATES_MODEL(INTEL_FAM6_NEHALEM,    nhm_cstates),
 496         X86_CSTATES_MODEL(INTEL_FAM6_NEHALEM_EP, nhm_cstates),
 497         X86_CSTATES_MODEL(INTEL_FAM6_NEHALEM_EX, nhm_cstates),
 498
 499         X86_CSTATES_MODEL(INTEL_FAM6_WESTMERE,    nhm_cstates),
 500         X86_CSTATES_MODEL(INTEL_FAM6_WESTMERE_EP, nhm_cstates),
 501         X86_CSTATES_MODEL(INTEL_FAM6_WESTMERE_EX, nhm_cstates),
 502
 503         X86_CSTATES_MODEL(INTEL_FAM6_SANDYBRIDGE,   snb_cstates),
 504         X86_CSTATES_MODEL(INTEL_FAM6_SANDYBRIDGE_X, snb_cstates),
 505
 506         X86_CSTATES_MODEL(INTEL_FAM6_IVYBRIDGE,   snb_cstates),
 507         X86_CSTATES_MODEL(INTEL_FAM6_IVYBRIDGE_X, snb_cstates),
 508
 509         X86_CSTATES_MODEL(INTEL_FAM6_HASWELL_CORE, snb_cstates),
 510         X86_CSTATES_MODEL(INTEL_FAM6_HASWELL_X,    snb_cstates),
 511         X86_CSTATES_MODEL(INTEL_FAM6_HASWELL_GT3E, snb_cstates),
 512
 513         X86_CSTATES_MODEL(INTEL_FAM6_HASWELL_ULT, hswult_cstates),
 514
 515         X86_CSTATES_MODEL(INTEL_FAM6_ATOM_SILVERMONT1, slm_cstates),
 516         X86_CSTATES_MODEL(INTEL_FAM6_ATOM_SILVERMONT2, slm_cstates),
 517         X86_CSTATES_MODEL(INTEL_FAM6_ATOM_AIRMONT,     slm_cstates),
 518
 519         X86_CSTATES_MODEL(INTEL_FAM6_BROADWELL_CORE,   snb_cstates),
 520         X86_CSTATES_MODEL(INTEL_FAM6_BROADWELL_XEON_D, snb_cstates),
 521         X86_CSTATES_MODEL(INTEL_FAM6_BROADWELL_GT3E,   snb_cstates),
 522         X86_CSTATES_MODEL(INTEL_FAM6_BROADWELL_X,      snb_cstates),
 523
 524         X86_CSTATES_MODEL(INTEL_FAM6_SKYLAKE_MOBILE,  snb_cstates),
 525         X86_CSTATES_MODEL(INTEL_FAM6_SKYLAKE_DESKTOP, snb_cstates),
 526         { },
 527 };
 528 MODULE_DEVICE_TABLE(x86cpu, intel_cstates_match);
 529
 530 /*
 531  * Probe the cstate events and insert the available one into sysfs attrs
 532  * Return false if there are no available events.
 533  */
 534 static bool __init cstate_probe_msr(const unsigned long evmsk, int max,
 535                                    struct perf_cstate_msr *msr,
 536                                    struct attribute **attrs)
 537 {
 538         bool found = false;
 539         unsigned int bit;
 540         u64 val;
 541
 542         for (bit = 0; bit < max; bit++) {
 543                 if (test_bit(bit, &evmsk) && !rdmsrl_safe(msr[bit].msr, &val)) {
 544                         *attrs++ = &msr[bit].attr->attr.attr;
 545                         found = true;
 546                 } else {
 547                         msr[bit].attr = NULL;
 548                 }
 549         }
 550         *attrs = NULL;
 551
 552         return found;
 553 }
 554
 555 static int __init cstate_probe(const struct cstate_model *cm)
 556 {
 557         /* SLM has different MSR for PKG C6 */
 558         if (cm->quirks & SLM_PKG_C6_USE_C7_MSR)
 559                 pkg_msr[PERF_CSTATE_PKG_C6_RES].msr = MSR_PKG_C7_RESIDENCY;
 560
 561         has_cstate_core = cstate_probe_msr(cm->core_events,
 562                                            PERF_CSTATE_CORE_EVENT_MAX,
 563                                            core_msr, core_events_attrs);
 564
 565         has_cstate_pkg = cstate_probe_msr(cm->pkg_events,
 566                                           PERF_CSTATE_PKG_EVENT_MAX,
 567                                           pkg_msr, pkg_events_attrs);
 568
 569         return (has_cstate_core || has_cstate_pkg) ? 0 : -ENODEV;
 570 }
 571
 572 static inline void cstate_cleanup(void)
 573 {
 574         if (has_cstate_core)
 575                 perf_pmu_unregister(&cstate_core_pmu);
 576
 577         if (has_cstate_pkg)
 578                 perf_pmu_unregister(&cstate_pkg_pmu);
 579 }
 580
 581 static int __init cstate_init(void)
 582 {
 583         int err;
 584
 585         cpuhp_setup_state(CPUHP_AP_PERF_X86_CSTATE_STARTING,
 586                           "AP_PERF_X86_CSTATE_STARTING", cstate_cpu_init,
 587                           NULL);
 588         cpuhp_setup_state(CPUHP_AP_PERF_X86_CSTATE_ONLINE,
 589                           "AP_PERF_X86_CSTATE_ONLINE", NULL, cstate_cpu_exit);
 590
 591         if (has_cstate_core) {
 592                 err = perf_pmu_register(&cstate_core_pmu, cstate_core_pmu.name, -1);
 593                 if (err) {
 594                         has_cstate_core = false;
 595                         pr_info("Failed to register cstate core pmu\n");
 596                         return err;
 597                 }
 598         }
 599
 600         if (has_cstate_pkg) {
 601                 err = perf_pmu_register(&cstate_pkg_pmu, cstate_pkg_pmu.name, -1);
 602                 if (err) {
 603                         has_cstate_pkg = false;
 604                         pr_info("Failed to register cstate pkg pmu\n");
 605                         cstate_cleanup();
 606                         return err;
 607                 }
 608         }
 609
 610         return err;
 611 }
 612
 613 static int __init cstate_pmu_init(void)
 614 {
 615         const struct x86_cpu_id *id;
 616         int err;
 617
 618         if (boot_cpu_has(X86_FEATURE_HYPERVISOR))
 619                 return -ENODEV;
 620
 621         id = x86_match_cpu(intel_cstates_match);
 622         if (!id)
 623                 return -ENODEV;
 624
 625         err = cstate_probe((const struct cstate_model *) id->driver_data);
 626         if (err)
 627                 return err;
 628
 629         return cstate_init();
 630 }
 631 module_init(cstate_pmu_init);
 632
 633 static void __exit cstate_pmu_exit(void)
 634 {
 635         cpuhp_remove_state_nocalls(CPUHP_AP_PERF_X86_CSTATE_ONLINE);
 636         cpuhp_remove_state_nocalls(CPUHP_AP_PERF_X86_CSTATE_STARTING);
 637         cstate_cleanup();
 638 }
 639 module_exit(cstate_pmu_exit);