arch/x86/events/intel/cstate.c

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This source file includes following definitions.
test_msr
cstate_get_attr_cpumask
cstate_pmu_event_init
cstate_pmu_read_counter
cstate_pmu_event_update
cstate_pmu_event_start
cstate_pmu_event_stop
cstate_pmu_event_del
cstate_pmu_event_add
cstate_cpu_exit
cstate_cpu_init
cstate_probe
cstate_cleanup
cstate_init
cstate_pmu_init
cstate_pmu_exit
   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
  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
  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
  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
  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
  70  *                             Scope: Package (physical package)
  71  *      MSR_PKG_C6_RESIDENCY:  Package C6 Residency Counter.
  72  *                             perf code: 0x02
  73  *                             Available model: SLM,AMT,NHM,WSM,SNB,IVB,HSW,BDW,
  74  *                                              SKL,KNL,GLM,CNL,KBL,CML,ICL,TGL,
  75  *                                              TNT
  76  *                             Scope: Package (physical package)
  77  *      MSR_PKG_C7_RESIDENCY:  Package C7 Residency Counter.
  78  *                             perf code: 0x03
  79  *                             Available model: NHM,WSM,SNB,IVB,HSW,BDW,SKL,CNL,
  80  *                                              KBL,CML,ICL,TGL
  81  *                             Scope: Package (physical package)
  82  *      MSR_PKG_C8_RESIDENCY:  Package C8 Residency Counter.
  83  *                             perf code: 0x04
  84  *                             Available model: HSW ULT,KBL,CNL,CML,ICL,TGL
  85  *                             Scope: Package (physical package)
  86  *      MSR_PKG_C9_RESIDENCY:  Package C9 Residency Counter.
  87  *                             perf code: 0x05
  88  *                             Available model: HSW ULT,KBL,CNL,CML,ICL,TGL
  89  *                             Scope: Package (physical package)
  90  *      MSR_PKG_C10_RESIDENCY: Package C10 Residency Counter.
  91  *                             perf code: 0x06
  92  *                             Available model: HSW ULT,KBL,GLM,CNL,CML,ICL,TGL,
  93  *                                              TNT
  94  *                             Scope: Package (physical package)
  95  *
  96  */
  97 
  98 #include <linux/module.h>
  99 #include <linux/slab.h>
 100 #include <linux/perf_event.h>
 101 #include <linux/nospec.h>
 102 #include <asm/cpu_device_id.h>
 103 #include <asm/intel-family.h>
 104 #include "../perf_event.h"
 105 #include "../probe.h"
 106 
 107 MODULE_LICENSE("GPL");
 108 
 109 #define DEFINE_CSTATE_FORMAT_ATTR(_var, _name, _format)         \
 110 static ssize_t __cstate_##_var##_show(struct kobject *kobj,     \
 111                                 struct kobj_attribute *attr,    \
 112                                 char *page)                     \
 113 {                                                               \
 114         BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE);             \
 115         return sprintf(page, _format "\n");                     \
 116 }                                                               \
 117 static struct kobj_attribute format_attr_##_var =               \
 118         __ATTR(_name, 0444, __cstate_##_var##_show, NULL)
 119 
 120 static ssize_t cstate_get_attr_cpumask(struct device *dev,
 121                                        struct device_attribute *attr,
 122                                        char *buf);
 123 
 124 /* Model -> events mapping */
 125 struct cstate_model {
 126         unsigned long           core_events;
 127         unsigned long           pkg_events;
 128         unsigned long           quirks;
 129 };
 130 
 131 /* Quirk flags */
 132 #define SLM_PKG_C6_USE_C7_MSR   (1UL << 0)
 133 #define KNL_CORE_C6_MSR         (1UL << 1)
 134 
 135 struct perf_cstate_msr {
 136         u64     msr;
 137         struct  perf_pmu_events_attr *attr;
 138 };
 139 
 140 
 141 /* cstate_core PMU */
 142 static struct pmu cstate_core_pmu;
 143 static bool has_cstate_core;
 144 
 145 enum perf_cstate_core_events {
 146         PERF_CSTATE_CORE_C1_RES = 0,
 147         PERF_CSTATE_CORE_C3_RES,
 148         PERF_CSTATE_CORE_C6_RES,
 149         PERF_CSTATE_CORE_C7_RES,
 150 
 151         PERF_CSTATE_CORE_EVENT_MAX,
 152 };
 153 
 154 PMU_EVENT_ATTR_STRING(c1-residency, attr_cstate_core_c1, "event=0x00");
 155 PMU_EVENT_ATTR_STRING(c3-residency, attr_cstate_core_c3, "event=0x01");
 156 PMU_EVENT_ATTR_STRING(c6-residency, attr_cstate_core_c6, "event=0x02");
 157 PMU_EVENT_ATTR_STRING(c7-residency, attr_cstate_core_c7, "event=0x03");
 158 
 159 static unsigned long core_msr_mask;
 160 
 161 PMU_EVENT_GROUP(events, cstate_core_c1);
 162 PMU_EVENT_GROUP(events, cstate_core_c3);
 163 PMU_EVENT_GROUP(events, cstate_core_c6);
 164 PMU_EVENT_GROUP(events, cstate_core_c7);
 165 
 166 static bool test_msr(int idx, void *data)
 167 {
 168         return test_bit(idx, (unsigned long *) data);
 169 }
 170 
 171 static struct perf_msr core_msr[] = {
 172         [PERF_CSTATE_CORE_C1_RES] = { MSR_CORE_C1_RES,          &group_cstate_core_c1,  test_msr },
 173         [PERF_CSTATE_CORE_C3_RES] = { MSR_CORE_C3_RESIDENCY,    &group_cstate_core_c3,  test_msr },
 174         [PERF_CSTATE_CORE_C6_RES] = { MSR_CORE_C6_RESIDENCY,    &group_cstate_core_c6,  test_msr },
 175         [PERF_CSTATE_CORE_C7_RES] = { MSR_CORE_C7_RESIDENCY,    &group_cstate_core_c7,  test_msr },
 176 };
 177 
 178 static struct attribute *attrs_empty[] = {
 179         NULL,
 180 };
 181 
 182 /*
 183  * There are no default events, but we need to create
 184  * "events" group (with empty attrs) before updating
 185  * it with detected events.
 186  */
 187 static struct attribute_group core_events_attr_group = {
 188         .name = "events",
 189         .attrs = attrs_empty,
 190 };
 191 
 192 DEFINE_CSTATE_FORMAT_ATTR(core_event, event, "config:0-63");
 193 static struct attribute *core_format_attrs[] = {
 194         &format_attr_core_event.attr,
 195         NULL,
 196 };
 197 
 198 static struct attribute_group core_format_attr_group = {
 199         .name = "format",
 200         .attrs = core_format_attrs,
 201 };
 202 
 203 static cpumask_t cstate_core_cpu_mask;
 204 static DEVICE_ATTR(cpumask, S_IRUGO, cstate_get_attr_cpumask, NULL);
 205 
 206 static struct attribute *cstate_cpumask_attrs[] = {
 207         &dev_attr_cpumask.attr,
 208         NULL,
 209 };
 210 
 211 static struct attribute_group cpumask_attr_group = {
 212         .attrs = cstate_cpumask_attrs,
 213 };
 214 
 215 static const struct attribute_group *core_attr_groups[] = {
 216         &core_events_attr_group,
 217         &core_format_attr_group,
 218         &cpumask_attr_group,
 219         NULL,
 220 };
 221 
 222 /* cstate_pkg PMU */
 223 static struct pmu cstate_pkg_pmu;
 224 static bool has_cstate_pkg;
 225 
 226 enum perf_cstate_pkg_events {
 227         PERF_CSTATE_PKG_C2_RES = 0,
 228         PERF_CSTATE_PKG_C3_RES,
 229         PERF_CSTATE_PKG_C6_RES,
 230         PERF_CSTATE_PKG_C7_RES,
 231         PERF_CSTATE_PKG_C8_RES,
 232         PERF_CSTATE_PKG_C9_RES,
 233         PERF_CSTATE_PKG_C10_RES,
 234 
 235         PERF_CSTATE_PKG_EVENT_MAX,
 236 };
 237 
 238 PMU_EVENT_ATTR_STRING(c2-residency,  attr_cstate_pkg_c2,  "event=0x00");
 239 PMU_EVENT_ATTR_STRING(c3-residency,  attr_cstate_pkg_c3,  "event=0x01");
 240 PMU_EVENT_ATTR_STRING(c6-residency,  attr_cstate_pkg_c6,  "event=0x02");
 241 PMU_EVENT_ATTR_STRING(c7-residency,  attr_cstate_pkg_c7,  "event=0x03");
 242 PMU_EVENT_ATTR_STRING(c8-residency,  attr_cstate_pkg_c8,  "event=0x04");
 243 PMU_EVENT_ATTR_STRING(c9-residency,  attr_cstate_pkg_c9,  "event=0x05");
 244 PMU_EVENT_ATTR_STRING(c10-residency, attr_cstate_pkg_c10, "event=0x06");
 245 
 246 static unsigned long pkg_msr_mask;
 247 
 248 PMU_EVENT_GROUP(events, cstate_pkg_c2);
 249 PMU_EVENT_GROUP(events, cstate_pkg_c3);
 250 PMU_EVENT_GROUP(events, cstate_pkg_c6);
 251 PMU_EVENT_GROUP(events, cstate_pkg_c7);
 252 PMU_EVENT_GROUP(events, cstate_pkg_c8);
 253 PMU_EVENT_GROUP(events, cstate_pkg_c9);
 254 PMU_EVENT_GROUP(events, cstate_pkg_c10);
 255 
 256 static struct perf_msr pkg_msr[] = {
 257         [PERF_CSTATE_PKG_C2_RES]  = { MSR_PKG_C2_RESIDENCY,     &group_cstate_pkg_c2,   test_msr },
 258         [PERF_CSTATE_PKG_C3_RES]  = { MSR_PKG_C3_RESIDENCY,     &group_cstate_pkg_c3,   test_msr },
 259         [PERF_CSTATE_PKG_C6_RES]  = { MSR_PKG_C6_RESIDENCY,     &group_cstate_pkg_c6,   test_msr },
 260         [PERF_CSTATE_PKG_C7_RES]  = { MSR_PKG_C7_RESIDENCY,     &group_cstate_pkg_c7,   test_msr },
 261         [PERF_CSTATE_PKG_C8_RES]  = { MSR_PKG_C8_RESIDENCY,     &group_cstate_pkg_c8,   test_msr },
 262         [PERF_CSTATE_PKG_C9_RES]  = { MSR_PKG_C9_RESIDENCY,     &group_cstate_pkg_c9,   test_msr },
 263         [PERF_CSTATE_PKG_C10_RES] = { MSR_PKG_C10_RESIDENCY,    &group_cstate_pkg_c10,  test_msr },
 264 };
 265 
 266 static struct attribute_group pkg_events_attr_group = {
 267         .name = "events",
 268         .attrs = attrs_empty,
 269 };
 270 
 271 DEFINE_CSTATE_FORMAT_ATTR(pkg_event, event, "config:0-63");
 272 static struct attribute *pkg_format_attrs[] = {
 273         &format_attr_pkg_event.attr,
 274         NULL,
 275 };
 276 static struct attribute_group pkg_format_attr_group = {
 277         .name = "format",
 278         .attrs = pkg_format_attrs,
 279 };
 280 
 281 static cpumask_t cstate_pkg_cpu_mask;
 282 
 283 static const struct attribute_group *pkg_attr_groups[] = {
 284         &pkg_events_attr_group,
 285         &pkg_format_attr_group,
 286         &cpumask_attr_group,
 287         NULL,
 288 };
 289 
 290 static ssize_t cstate_get_attr_cpumask(struct device *dev,
 291                                        struct device_attribute *attr,
 292                                        char *buf)
 293 {
 294         struct pmu *pmu = dev_get_drvdata(dev);
 295 
 296         if (pmu == &cstate_core_pmu)
 297                 return cpumap_print_to_pagebuf(true, buf, &cstate_core_cpu_mask);
 298         else if (pmu == &cstate_pkg_pmu)
 299                 return cpumap_print_to_pagebuf(true, buf, &cstate_pkg_cpu_mask);
 300         else
 301                 return 0;
 302 }
 303 
 304 static int cstate_pmu_event_init(struct perf_event *event)
 305 {
 306         u64 cfg = event->attr.config;
 307         int cpu;
 308 
 309         if (event->attr.type != event->pmu->type)
 310                 return -ENOENT;
 311 
 312         /* unsupported modes and filters */
 313         if (event->attr.sample_period) /* no sampling */
 314                 return -EINVAL;
 315 
 316         if (event->cpu < 0)
 317                 return -EINVAL;
 318 
 319         if (event->pmu == &cstate_core_pmu) {
 320                 if (cfg >= PERF_CSTATE_CORE_EVENT_MAX)
 321                         return -EINVAL;
 322                 cfg = array_index_nospec((unsigned long)cfg, PERF_CSTATE_CORE_EVENT_MAX);
 323                 if (!(core_msr_mask & (1 << cfg)))
 324                         return -EINVAL;
 325                 event->hw.event_base = core_msr[cfg].msr;
 326                 cpu = cpumask_any_and(&cstate_core_cpu_mask,
 327                                       topology_sibling_cpumask(event->cpu));
 328         } else if (event->pmu == &cstate_pkg_pmu) {
 329                 if (cfg >= PERF_CSTATE_PKG_EVENT_MAX)
 330                         return -EINVAL;
 331                 cfg = array_index_nospec((unsigned long)cfg, PERF_CSTATE_PKG_EVENT_MAX);
 332                 if (!(pkg_msr_mask & (1 << cfg)))
 333                         return -EINVAL;
 334                 event->hw.event_base = pkg_msr[cfg].msr;
 335                 cpu = cpumask_any_and(&cstate_pkg_cpu_mask,
 336                                       topology_die_cpumask(event->cpu));
 337         } else {
 338                 return -ENOENT;
 339         }
 340 
 341         if (cpu >= nr_cpu_ids)
 342                 return -ENODEV;
 343 
 344         event->cpu = cpu;
 345         event->hw.config = cfg;
 346         event->hw.idx = -1;
 347         return 0;
 348 }
 349 
 350 static inline u64 cstate_pmu_read_counter(struct perf_event *event)
 351 {
 352         u64 val;
 353 
 354         rdmsrl(event->hw.event_base, val);
 355         return val;
 356 }
 357 
 358 static void cstate_pmu_event_update(struct perf_event *event)
 359 {
 360         struct hw_perf_event *hwc = &event->hw;
 361         u64 prev_raw_count, new_raw_count;
 362 
 363 again:
 364         prev_raw_count = local64_read(&hwc->prev_count);
 365         new_raw_count = cstate_pmu_read_counter(event);
 366 
 367         if (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
 368                             new_raw_count) != prev_raw_count)
 369                 goto again;
 370 
 371         local64_add(new_raw_count - prev_raw_count, &event->count);
 372 }
 373 
 374 static void cstate_pmu_event_start(struct perf_event *event, int mode)
 375 {
 376         local64_set(&event->hw.prev_count, cstate_pmu_read_counter(event));
 377 }
 378 
 379 static void cstate_pmu_event_stop(struct perf_event *event, int mode)
 380 {
 381         cstate_pmu_event_update(event);
 382 }
 383 
 384 static void cstate_pmu_event_del(struct perf_event *event, int mode)
 385 {
 386         cstate_pmu_event_stop(event, PERF_EF_UPDATE);
 387 }
 388 
 389 static int cstate_pmu_event_add(struct perf_event *event, int mode)
 390 {
 391         if (mode & PERF_EF_START)
 392                 cstate_pmu_event_start(event, mode);
 393 
 394         return 0;
 395 }
 396 
 397 /*
 398  * Check if exiting cpu is the designated reader. If so migrate the
 399  * events when there is a valid target available
 400  */
 401 static int cstate_cpu_exit(unsigned int cpu)
 402 {
 403         unsigned int target;
 404 
 405         if (has_cstate_core &&
 406             cpumask_test_and_clear_cpu(cpu, &cstate_core_cpu_mask)) {
 407 
 408                 target = cpumask_any_but(topology_sibling_cpumask(cpu), cpu);
 409                 /* Migrate events if there is a valid target */
 410                 if (target < nr_cpu_ids) {
 411                         cpumask_set_cpu(target, &cstate_core_cpu_mask);
 412                         perf_pmu_migrate_context(&cstate_core_pmu, cpu, target);
 413                 }
 414         }
 415 
 416         if (has_cstate_pkg &&
 417             cpumask_test_and_clear_cpu(cpu, &cstate_pkg_cpu_mask)) {
 418 
 419                 target = cpumask_any_but(topology_die_cpumask(cpu), cpu);
 420                 /* Migrate events if there is a valid target */
 421                 if (target < nr_cpu_ids) {
 422                         cpumask_set_cpu(target, &cstate_pkg_cpu_mask);
 423                         perf_pmu_migrate_context(&cstate_pkg_pmu, cpu, target);
 424                 }
 425         }
 426         return 0;
 427 }
 428 
 429 static int cstate_cpu_init(unsigned int cpu)
 430 {
 431         unsigned int target;
 432 
 433         /*
 434          * If this is the first online thread of that core, set it in
 435          * the core cpu mask as the designated reader.
 436          */
 437         target = cpumask_any_and(&cstate_core_cpu_mask,
 438                                  topology_sibling_cpumask(cpu));
 439 
 440         if (has_cstate_core && target >= nr_cpu_ids)
 441                 cpumask_set_cpu(cpu, &cstate_core_cpu_mask);
 442 
 443         /*
 444          * If this is the first online thread of that package, set it
 445          * in the package cpu mask as the designated reader.
 446          */
 447         target = cpumask_any_and(&cstate_pkg_cpu_mask,
 448                                  topology_die_cpumask(cpu));
 449         if (has_cstate_pkg && target >= nr_cpu_ids)
 450                 cpumask_set_cpu(cpu, &cstate_pkg_cpu_mask);
 451 
 452         return 0;
 453 }
 454 
 455 static const struct attribute_group *core_attr_update[] = {
 456         &group_cstate_core_c1,
 457         &group_cstate_core_c3,
 458         &group_cstate_core_c6,
 459         &group_cstate_core_c7,
 460         NULL,
 461 };
 462 
 463 static const struct attribute_group *pkg_attr_update[] = {
 464         &group_cstate_pkg_c2,
 465         &group_cstate_pkg_c3,
 466         &group_cstate_pkg_c6,
 467         &group_cstate_pkg_c7,
 468         &group_cstate_pkg_c8,
 469         &group_cstate_pkg_c9,
 470         &group_cstate_pkg_c10,
 471         NULL,
 472 };
 473 
 474 static struct pmu cstate_core_pmu = {
 475         .attr_groups    = core_attr_groups,
 476         .attr_update    = core_attr_update,
 477         .name           = "cstate_core",
 478         .task_ctx_nr    = perf_invalid_context,
 479         .event_init     = cstate_pmu_event_init,
 480         .add            = cstate_pmu_event_add,
 481         .del            = cstate_pmu_event_del,
 482         .start          = cstate_pmu_event_start,
 483         .stop           = cstate_pmu_event_stop,
 484         .read           = cstate_pmu_event_update,
 485         .capabilities   = PERF_PMU_CAP_NO_INTERRUPT | PERF_PMU_CAP_NO_EXCLUDE,
 486         .module         = THIS_MODULE,
 487 };
 488 
 489 static struct pmu cstate_pkg_pmu = {
 490         .attr_groups    = pkg_attr_groups,
 491         .attr_update    = pkg_attr_update,
 492         .name           = "cstate_pkg",
 493         .task_ctx_nr    = perf_invalid_context,
 494         .event_init     = cstate_pmu_event_init,
 495         .add            = cstate_pmu_event_add,
 496         .del            = cstate_pmu_event_del,
 497         .start          = cstate_pmu_event_start,
 498         .stop           = cstate_pmu_event_stop,
 499         .read           = cstate_pmu_event_update,
 500         .capabilities   = PERF_PMU_CAP_NO_INTERRUPT | PERF_PMU_CAP_NO_EXCLUDE,
 501         .module         = THIS_MODULE,
 502 };
 503 
 504 static const struct cstate_model nhm_cstates __initconst = {
 505         .core_events            = BIT(PERF_CSTATE_CORE_C3_RES) |
 506                                   BIT(PERF_CSTATE_CORE_C6_RES),
 507 
 508         .pkg_events             = BIT(PERF_CSTATE_PKG_C3_RES) |
 509                                   BIT(PERF_CSTATE_PKG_C6_RES) |
 510                                   BIT(PERF_CSTATE_PKG_C7_RES),
 511 };
 512 
 513 static const struct cstate_model snb_cstates __initconst = {
 514         .core_events            = BIT(PERF_CSTATE_CORE_C3_RES) |
 515                                   BIT(PERF_CSTATE_CORE_C6_RES) |
 516                                   BIT(PERF_CSTATE_CORE_C7_RES),
 517 
 518         .pkg_events             = BIT(PERF_CSTATE_PKG_C2_RES) |
 519                                   BIT(PERF_CSTATE_PKG_C3_RES) |
 520                                   BIT(PERF_CSTATE_PKG_C6_RES) |
 521                                   BIT(PERF_CSTATE_PKG_C7_RES),
 522 };
 523 
 524 static const struct cstate_model hswult_cstates __initconst = {
 525         .core_events            = BIT(PERF_CSTATE_CORE_C3_RES) |
 526                                   BIT(PERF_CSTATE_CORE_C6_RES) |
 527                                   BIT(PERF_CSTATE_CORE_C7_RES),
 528 
 529         .pkg_events             = BIT(PERF_CSTATE_PKG_C2_RES) |
 530                                   BIT(PERF_CSTATE_PKG_C3_RES) |
 531                                   BIT(PERF_CSTATE_PKG_C6_RES) |
 532                                   BIT(PERF_CSTATE_PKG_C7_RES) |
 533                                   BIT(PERF_CSTATE_PKG_C8_RES) |
 534                                   BIT(PERF_CSTATE_PKG_C9_RES) |
 535                                   BIT(PERF_CSTATE_PKG_C10_RES),
 536 };
 537 
 538 static const struct cstate_model cnl_cstates __initconst = {
 539         .core_events            = BIT(PERF_CSTATE_CORE_C1_RES) |
 540                                   BIT(PERF_CSTATE_CORE_C3_RES) |
 541                                   BIT(PERF_CSTATE_CORE_C6_RES) |
 542                                   BIT(PERF_CSTATE_CORE_C7_RES),
 543 
 544         .pkg_events             = BIT(PERF_CSTATE_PKG_C2_RES) |
 545                                   BIT(PERF_CSTATE_PKG_C3_RES) |
 546                                   BIT(PERF_CSTATE_PKG_C6_RES) |
 547                                   BIT(PERF_CSTATE_PKG_C7_RES) |
 548                                   BIT(PERF_CSTATE_PKG_C8_RES) |
 549                                   BIT(PERF_CSTATE_PKG_C9_RES) |
 550                                   BIT(PERF_CSTATE_PKG_C10_RES),
 551 };
 552 
 553 static const struct cstate_model icl_cstates __initconst = {
 554         .core_events            = BIT(PERF_CSTATE_CORE_C6_RES) |
 555                                   BIT(PERF_CSTATE_CORE_C7_RES),
 556 
 557         .pkg_events             = BIT(PERF_CSTATE_PKG_C2_RES) |
 558                                   BIT(PERF_CSTATE_PKG_C3_RES) |
 559                                   BIT(PERF_CSTATE_PKG_C6_RES) |
 560                                   BIT(PERF_CSTATE_PKG_C7_RES) |
 561                                   BIT(PERF_CSTATE_PKG_C8_RES) |
 562                                   BIT(PERF_CSTATE_PKG_C9_RES) |
 563                                   BIT(PERF_CSTATE_PKG_C10_RES),
 564 };
 565 
 566 static const struct cstate_model slm_cstates __initconst = {
 567         .core_events            = BIT(PERF_CSTATE_CORE_C1_RES) |
 568                                   BIT(PERF_CSTATE_CORE_C6_RES),
 569 
 570         .pkg_events             = BIT(PERF_CSTATE_PKG_C6_RES),
 571         .quirks                 = SLM_PKG_C6_USE_C7_MSR,
 572 };
 573 
 574 
 575 static const struct cstate_model knl_cstates __initconst = {
 576         .core_events            = BIT(PERF_CSTATE_CORE_C6_RES),
 577 
 578         .pkg_events             = BIT(PERF_CSTATE_PKG_C2_RES) |
 579                                   BIT(PERF_CSTATE_PKG_C3_RES) |
 580                                   BIT(PERF_CSTATE_PKG_C6_RES),
 581         .quirks                 = KNL_CORE_C6_MSR,
 582 };
 583 
 584 
 585 static const struct cstate_model glm_cstates __initconst = {
 586         .core_events            = BIT(PERF_CSTATE_CORE_C1_RES) |
 587                                   BIT(PERF_CSTATE_CORE_C3_RES) |
 588                                   BIT(PERF_CSTATE_CORE_C6_RES),
 589 
 590         .pkg_events             = BIT(PERF_CSTATE_PKG_C2_RES) |
 591                                   BIT(PERF_CSTATE_PKG_C3_RES) |
 592                                   BIT(PERF_CSTATE_PKG_C6_RES) |
 593                                   BIT(PERF_CSTATE_PKG_C10_RES),
 594 };
 595 
 596 
 597 #define X86_CSTATES_MODEL(model, states)                                \
 598         { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, (unsigned long) &(states) }
 599 
 600 static const struct x86_cpu_id intel_cstates_match[] __initconst = {
 601         X86_CSTATES_MODEL(INTEL_FAM6_NEHALEM,    nhm_cstates),
 602         X86_CSTATES_MODEL(INTEL_FAM6_NEHALEM_EP, nhm_cstates),
 603         X86_CSTATES_MODEL(INTEL_FAM6_NEHALEM_EX, nhm_cstates),
 604 
 605         X86_CSTATES_MODEL(INTEL_FAM6_WESTMERE,    nhm_cstates),
 606         X86_CSTATES_MODEL(INTEL_FAM6_WESTMERE_EP, nhm_cstates),
 607         X86_CSTATES_MODEL(INTEL_FAM6_WESTMERE_EX, nhm_cstates),
 608 
 609         X86_CSTATES_MODEL(INTEL_FAM6_SANDYBRIDGE,   snb_cstates),
 610         X86_CSTATES_MODEL(INTEL_FAM6_SANDYBRIDGE_X, snb_cstates),
 611 
 612         X86_CSTATES_MODEL(INTEL_FAM6_IVYBRIDGE,   snb_cstates),
 613         X86_CSTATES_MODEL(INTEL_FAM6_IVYBRIDGE_X, snb_cstates),
 614 
 615         X86_CSTATES_MODEL(INTEL_FAM6_HASWELL,   snb_cstates),
 616         X86_CSTATES_MODEL(INTEL_FAM6_HASWELL_X, snb_cstates),
 617         X86_CSTATES_MODEL(INTEL_FAM6_HASWELL_G, snb_cstates),
 618 
 619         X86_CSTATES_MODEL(INTEL_FAM6_HASWELL_L, hswult_cstates),
 620 
 621         X86_CSTATES_MODEL(INTEL_FAM6_ATOM_SILVERMONT,   slm_cstates),
 622         X86_CSTATES_MODEL(INTEL_FAM6_ATOM_SILVERMONT_D, slm_cstates),
 623         X86_CSTATES_MODEL(INTEL_FAM6_ATOM_AIRMONT,      slm_cstates),
 624 
 625         X86_CSTATES_MODEL(INTEL_FAM6_BROADWELL,   snb_cstates),
 626         X86_CSTATES_MODEL(INTEL_FAM6_BROADWELL_D, snb_cstates),
 627         X86_CSTATES_MODEL(INTEL_FAM6_BROADWELL_G, snb_cstates),
 628         X86_CSTATES_MODEL(INTEL_FAM6_BROADWELL_X, snb_cstates),
 629 
 630         X86_CSTATES_MODEL(INTEL_FAM6_SKYLAKE_L, snb_cstates),
 631         X86_CSTATES_MODEL(INTEL_FAM6_SKYLAKE,   snb_cstates),
 632         X86_CSTATES_MODEL(INTEL_FAM6_SKYLAKE_X, snb_cstates),
 633 
 634         X86_CSTATES_MODEL(INTEL_FAM6_KABYLAKE_L, hswult_cstates),
 635         X86_CSTATES_MODEL(INTEL_FAM6_KABYLAKE,   hswult_cstates),
 636         X86_CSTATES_MODEL(INTEL_FAM6_COMETLAKE_L, hswult_cstates),
 637         X86_CSTATES_MODEL(INTEL_FAM6_COMETLAKE, hswult_cstates),
 638 
 639         X86_CSTATES_MODEL(INTEL_FAM6_CANNONLAKE_L, cnl_cstates),
 640 
 641         X86_CSTATES_MODEL(INTEL_FAM6_XEON_PHI_KNL, knl_cstates),
 642         X86_CSTATES_MODEL(INTEL_FAM6_XEON_PHI_KNM, knl_cstates),
 643 
 644         X86_CSTATES_MODEL(INTEL_FAM6_ATOM_GOLDMONT,   glm_cstates),
 645         X86_CSTATES_MODEL(INTEL_FAM6_ATOM_GOLDMONT_D, glm_cstates),
 646         X86_CSTATES_MODEL(INTEL_FAM6_ATOM_GOLDMONT_PLUS, glm_cstates),
 647         X86_CSTATES_MODEL(INTEL_FAM6_ATOM_TREMONT_D, glm_cstates),
 648         X86_CSTATES_MODEL(INTEL_FAM6_ATOM_TREMONT, glm_cstates),
 649 
 650         X86_CSTATES_MODEL(INTEL_FAM6_ICELAKE_L, icl_cstates),
 651         X86_CSTATES_MODEL(INTEL_FAM6_ICELAKE,   icl_cstates),
 652         X86_CSTATES_MODEL(INTEL_FAM6_TIGERLAKE_L, icl_cstates),
 653         X86_CSTATES_MODEL(INTEL_FAM6_TIGERLAKE, icl_cstates),
 654         { },
 655 };
 656 MODULE_DEVICE_TABLE(x86cpu, intel_cstates_match);
 657 
 658 static int __init cstate_probe(const struct cstate_model *cm)
 659 {
 660         /* SLM has different MSR for PKG C6 */
 661         if (cm->quirks & SLM_PKG_C6_USE_C7_MSR)
 662                 pkg_msr[PERF_CSTATE_PKG_C6_RES].msr = MSR_PKG_C7_RESIDENCY;
 663 
 664         /* KNL has different MSR for CORE C6 */
 665         if (cm->quirks & KNL_CORE_C6_MSR)
 666                 pkg_msr[PERF_CSTATE_CORE_C6_RES].msr = MSR_KNL_CORE_C6_RESIDENCY;
 667 
 668 
 669         core_msr_mask = perf_msr_probe(core_msr, PERF_CSTATE_CORE_EVENT_MAX,
 670                                        true, (void *) &cm->core_events);
 671 
 672         pkg_msr_mask = perf_msr_probe(pkg_msr, PERF_CSTATE_PKG_EVENT_MAX,
 673                                       true, (void *) &cm->pkg_events);
 674 
 675         has_cstate_core = !!core_msr_mask;
 676         has_cstate_pkg  = !!pkg_msr_mask;
 677 
 678         return (has_cstate_core || has_cstate_pkg) ? 0 : -ENODEV;
 679 }
 680 
 681 static inline void cstate_cleanup(void)
 682 {
 683         cpuhp_remove_state_nocalls(CPUHP_AP_PERF_X86_CSTATE_ONLINE);
 684         cpuhp_remove_state_nocalls(CPUHP_AP_PERF_X86_CSTATE_STARTING);
 685 
 686         if (has_cstate_core)
 687                 perf_pmu_unregister(&cstate_core_pmu);
 688 
 689         if (has_cstate_pkg)
 690                 perf_pmu_unregister(&cstate_pkg_pmu);
 691 }
 692 
 693 static int __init cstate_init(void)
 694 {
 695         int err;
 696 
 697         cpuhp_setup_state(CPUHP_AP_PERF_X86_CSTATE_STARTING,
 698                           "perf/x86/cstate:starting", cstate_cpu_init, NULL);
 699         cpuhp_setup_state(CPUHP_AP_PERF_X86_CSTATE_ONLINE,
 700                           "perf/x86/cstate:online", NULL, cstate_cpu_exit);
 701 
 702         if (has_cstate_core) {
 703                 err = perf_pmu_register(&cstate_core_pmu, cstate_core_pmu.name, -1);
 704                 if (err) {
 705                         has_cstate_core = false;
 706                         pr_info("Failed to register cstate core pmu\n");
 707                         cstate_cleanup();
 708                         return err;
 709                 }
 710         }
 711 
 712         if (has_cstate_pkg) {
 713                 if (topology_max_die_per_package() > 1) {
 714                         err = perf_pmu_register(&cstate_pkg_pmu,
 715                                                 "cstate_die", -1);
 716                 } else {
 717                         err = perf_pmu_register(&cstate_pkg_pmu,
 718                                                 cstate_pkg_pmu.name, -1);
 719                 }
 720                 if (err) {
 721                         has_cstate_pkg = false;
 722                         pr_info("Failed to register cstate pkg pmu\n");
 723                         cstate_cleanup();
 724                         return err;
 725                 }
 726         }
 727         return 0;
 728 }
 729 
 730 static int __init cstate_pmu_init(void)
 731 {
 732         const struct x86_cpu_id *id;
 733         int err;
 734 
 735         if (boot_cpu_has(X86_FEATURE_HYPERVISOR))
 736                 return -ENODEV;
 737 
 738         id = x86_match_cpu(intel_cstates_match);
 739         if (!id)
 740                 return -ENODEV;
 741 
 742         err = cstate_probe((const struct cstate_model *) id->driver_data);
 743         if (err)
 744                 return err;
 745 
 746         return cstate_init();
 747 }
 748 module_init(cstate_pmu_init);
 749 
 750 static void __exit cstate_pmu_exit(void)
 751 {
 752         cstate_cleanup();
 753 }
 754 module_exit(cstate_pmu_exit);
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root/arch/x86/events/intel/cstate.c

DEFINITIONS
