arch/x86/events/intel/rapl.c

   1 /*
   2  * Support Intel RAPL energy consumption counters
   3  * Copyright (C) 2013 Google, Inc., Stephane Eranian
   4  *
   5  * Intel RAPL interface is specified in the IA-32 Manual Vol3b
   6  * section 14.7.1 (September 2013)
   7  *
   8  * RAPL provides more controls than just reporting energy consumption
   9  * however here we only expose the 3 energy consumption free running
  10  * counters (pp0, pkg, dram).
  11  *
  12  * Each of those counters increments in a power unit defined by the
  13  * RAPL_POWER_UNIT MSR. On SandyBridge, this unit is 1/(2^16) Joules
  14  * but it can vary.
  15  *
  16  * Counter to rapl events mappings:
  17  *
  18  *  pp0 counter: consumption of all physical cores (power plane 0)
  19  *        event: rapl_energy_cores
  20  *    perf code: 0x1
  21  *
  22  *  pkg counter: consumption of the whole processor package
  23  *        event: rapl_energy_pkg
  24  *    perf code: 0x2
  25  *
  26  * dram counter: consumption of the dram domain (servers only)
  27  *        event: rapl_energy_dram
  28  *    perf code: 0x3
  29  *
  30  * gpu counter: consumption of the builtin-gpu domain (client only)
  31  *        event: rapl_energy_gpu
  32  *    perf code: 0x4
  33  *
  34  *  psys counter: consumption of the builtin-psys domain (client only)
  35  *        event: rapl_energy_psys
  36  *    perf code: 0x5
  37  *
  38  * We manage those counters as free running (read-only). They may be
  39  * use simultaneously by other tools, such as turbostat.
  40  *
  41  * The events only support system-wide mode counting. There is no
  42  * sampling support because it does not make sense and is not
  43  * supported by the RAPL hardware.
  44  *
  45  * Because we want to avoid floating-point operations in the kernel,
  46  * the events are all reported in fixed point arithmetic (32.32).
  47  * Tools must adjust the counts to convert them to Watts using
  48  * the duration of the measurement. Tools may use a function such as
  49  * ldexp(raw_count, -32);
  50  */
  51
  52 #define pr_fmt(fmt) "RAPL PMU: " fmt
  53
  54 #include <linux/module.h>
  55 #include <linux/slab.h>
  56 #include <linux/perf_event.h>
  57 #include <asm/cpu_device_id.h>
  58 #include <asm/intel-family.h>
  59 #include "../perf_event.h"
  60
  61 MODULE_LICENSE("GPL");
  62
  63 /*
  64  * RAPL energy status counters
  65  */
  66 #define RAPL_IDX_PP0_NRG_STAT   0       /* all cores */
  67 #define INTEL_RAPL_PP0          0x1     /* pseudo-encoding */
  68 #define RAPL_IDX_PKG_NRG_STAT   1       /* entire package */
  69 #define INTEL_RAPL_PKG          0x2     /* pseudo-encoding */
  70 #define RAPL_IDX_RAM_NRG_STAT   2       /* DRAM */
  71 #define INTEL_RAPL_RAM          0x3     /* pseudo-encoding */
  72 #define RAPL_IDX_PP1_NRG_STAT   3       /* gpu */
  73 #define INTEL_RAPL_PP1          0x4     /* pseudo-encoding */
  74 #define RAPL_IDX_PSYS_NRG_STAT  4       /* psys */
  75 #define INTEL_RAPL_PSYS         0x5     /* pseudo-encoding */
  76
  77 #define NR_RAPL_DOMAINS         0x5
  78 static const char *const rapl_domain_names[NR_RAPL_DOMAINS] __initconst = {
  79         "pp0-core",
  80         "package",
  81         "dram",
  82         "pp1-gpu",
  83         "psys",
  84 };
  85
  86 /* Clients have PP0, PKG */
  87 #define RAPL_IDX_CLN    (1<<RAPL_IDX_PP0_NRG_STAT|\
  88                          1<<RAPL_IDX_PKG_NRG_STAT|\
  89                          1<<RAPL_IDX_PP1_NRG_STAT)
  90
  91 /* Servers have PP0, PKG, RAM */
  92 #define RAPL_IDX_SRV    (1<<RAPL_IDX_PP0_NRG_STAT|\
  93                          1<<RAPL_IDX_PKG_NRG_STAT|\
  94                          1<<RAPL_IDX_RAM_NRG_STAT)
  95
  96 /* Servers have PP0, PKG, RAM, PP1 */
  97 #define RAPL_IDX_HSW    (1<<RAPL_IDX_PP0_NRG_STAT|\
  98                          1<<RAPL_IDX_PKG_NRG_STAT|\
  99                          1<<RAPL_IDX_RAM_NRG_STAT|\
 100                          1<<RAPL_IDX_PP1_NRG_STAT)
 101
 102 /* SKL clients have PP0, PKG, RAM, PP1, PSYS */
 103 #define RAPL_IDX_SKL_CLN (1<<RAPL_IDX_PP0_NRG_STAT|\
 104                           1<<RAPL_IDX_PKG_NRG_STAT|\
 105                           1<<RAPL_IDX_RAM_NRG_STAT|\
 106                           1<<RAPL_IDX_PP1_NRG_STAT|\
 107                           1<<RAPL_IDX_PSYS_NRG_STAT)
 108
 109 /* Knights Landing has PKG, RAM */
 110 #define RAPL_IDX_KNL    (1<<RAPL_IDX_PKG_NRG_STAT|\
 111                          1<<RAPL_IDX_RAM_NRG_STAT)
 112
 113 /*
 114  * event code: LSB 8 bits, passed in attr->config
 115  * any other bit is reserved
 116  */
 117 #define RAPL_EVENT_MASK 0xFFULL
 118
 119 #define DEFINE_RAPL_FORMAT_ATTR(_var, _name, _format)           \
 120 static ssize_t __rapl_##_var##_show(struct kobject *kobj,       \
 121                                 struct kobj_attribute *attr,    \
 122                                 char *page)                     \
 123 {                                                               \
 124         BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE);             \
 125         return sprintf(page, _format "\n");                     \
 126 }                                                               \
 127 static struct kobj_attribute format_attr_##_var =               \
 128         __ATTR(_name, 0444, __rapl_##_var##_show, NULL)
 129
 130 #define RAPL_CNTR_WIDTH 32
 131
 132 #define RAPL_EVENT_ATTR_STR(_name, v, str)                                      \
 133 static struct perf_pmu_events_attr event_attr_##v = {                           \
 134         .attr           = __ATTR(_name, 0444, perf_event_sysfs_show, NULL),     \
 135         .id             = 0,                                                    \
 136         .event_str      = str,                                                  \
 137 };
 138
 139 struct rapl_pmu {
 140         raw_spinlock_t          lock;
 141         int                     n_active;
 142         int                     cpu;
 143         struct list_head        active_list;
 144         struct pmu              *pmu;
 145         ktime_t                 timer_interval;
 146         struct hrtimer          hrtimer;
 147 };
 148
 149 struct rapl_pmus {
 150         struct pmu              pmu;
 151         unsigned int            maxpkg;
 152         struct rapl_pmu         *pmus[];
 153 };
 154
 155  /* 1/2^hw_unit Joule */
 156 static int rapl_hw_unit[NR_RAPL_DOMAINS] __read_mostly;
 157 static struct rapl_pmus *rapl_pmus;
 158 static cpumask_t rapl_cpu_mask;
 159 static unsigned int rapl_cntr_mask;
 160 static u64 rapl_timer_ms;
 161
 162 static inline struct rapl_pmu *cpu_to_rapl_pmu(unsigned int cpu)
 163 {
 164         unsigned int pkgid = topology_logical_package_id(cpu);
 165
 166         /*
 167          * The unsigned check also catches the '-1' return value for non
 168          * existent mappings in the topology map.
 169          */
 170         return pkgid < rapl_pmus->maxpkg ? rapl_pmus->pmus[pkgid] : NULL;
 171 }
 172
 173 static inline u64 rapl_read_counter(struct perf_event *event)
 174 {
 175         u64 raw;
 176         rdmsrl(event->hw.event_base, raw);
 177         return raw;
 178 }
 179
 180 static inline u64 rapl_scale(u64 v, int cfg)
 181 {
 182         if (cfg > NR_RAPL_DOMAINS) {
 183                 pr_warn("Invalid domain %d, failed to scale data\n", cfg);
 184                 return v;
 185         }
 186         /*
 187          * scale delta to smallest unit (1/2^32)
 188          * users must then scale back: count * 1/(1e9*2^32) to get Joules
 189          * or use ldexp(count, -32).
 190          * Watts = Joules/Time delta
 191          */
 192         return v << (32 - rapl_hw_unit[cfg - 1]);
 193 }
 194
 195 static u64 rapl_event_update(struct perf_event *event)
 196 {
 197         struct hw_perf_event *hwc = &event->hw;
 198         u64 prev_raw_count, new_raw_count;
 199         s64 delta, sdelta;
 200         int shift = RAPL_CNTR_WIDTH;
 201
 202 again:
 203         prev_raw_count = local64_read(&hwc->prev_count);
 204         rdmsrl(event->hw.event_base, new_raw_count);
 205
 206         if (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
 207                             new_raw_count) != prev_raw_count) {
 208                 cpu_relax();
 209                 goto again;
 210         }
 211
 212         /*
 213          * Now we have the new raw value and have updated the prev
 214          * timestamp already. We can now calculate the elapsed delta
 215          * (event-)time and add that to the generic event.
 216          *
 217          * Careful, not all hw sign-extends above the physical width
 218          * of the count.
 219          */
 220         delta = (new_raw_count << shift) - (prev_raw_count << shift);
 221         delta >>= shift;
 222
 223         sdelta = rapl_scale(delta, event->hw.config);
 224
 225         local64_add(sdelta, &event->count);
 226
 227         return new_raw_count;
 228 }
 229
 230 static void rapl_start_hrtimer(struct rapl_pmu *pmu)
 231 {
 232        hrtimer_start(&pmu->hrtimer, pmu->timer_interval,
 233                      HRTIMER_MODE_REL_PINNED);
 234 }
 235
 236 static enum hrtimer_restart rapl_hrtimer_handle(struct hrtimer *hrtimer)
 237 {
 238         struct rapl_pmu *pmu = container_of(hrtimer, struct rapl_pmu, hrtimer);
 239         struct perf_event *event;
 240         unsigned long flags;
 241
 242         if (!pmu->n_active)
 243                 return HRTIMER_NORESTART;
 244
 245         raw_spin_lock_irqsave(&pmu->lock, flags);
 246
 247         list_for_each_entry(event, &pmu->active_list, active_entry)
 248                 rapl_event_update(event);
 249
 250         raw_spin_unlock_irqrestore(&pmu->lock, flags);
 251
 252         hrtimer_forward_now(hrtimer, pmu->timer_interval);
 253
 254         return HRTIMER_RESTART;
 255 }
 256
 257 static void rapl_hrtimer_init(struct rapl_pmu *pmu)
 258 {
 259         struct hrtimer *hr = &pmu->hrtimer;
 260
 261         hrtimer_init(hr, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 262         hr->function = rapl_hrtimer_handle;
 263 }
 264
 265 static void __rapl_pmu_event_start(struct rapl_pmu *pmu,
 266                                    struct perf_event *event)
 267 {
 268         if (WARN_ON_ONCE(!(event->hw.state & PERF_HES_STOPPED)))
 269                 return;
 270
 271         event->hw.state = 0;
 272
 273         list_add_tail(&event->active_entry, &pmu->active_list);
 274
 275         local64_set(&event->hw.prev_count, rapl_read_counter(event));
 276
 277         pmu->n_active++;
 278         if (pmu->n_active == 1)
 279                 rapl_start_hrtimer(pmu);
 280 }
 281
 282 static void rapl_pmu_event_start(struct perf_event *event, int mode)
 283 {
 284         struct rapl_pmu *pmu = event->pmu_private;
 285         unsigned long flags;
 286
 287         raw_spin_lock_irqsave(&pmu->lock, flags);
 288         __rapl_pmu_event_start(pmu, event);
 289         raw_spin_unlock_irqrestore(&pmu->lock, flags);
 290 }
 291
 292 static void rapl_pmu_event_stop(struct perf_event *event, int mode)
 293 {
 294         struct rapl_pmu *pmu = event->pmu_private;
 295         struct hw_perf_event *hwc = &event->hw;
 296         unsigned long flags;
 297
 298         raw_spin_lock_irqsave(&pmu->lock, flags);
 299
 300         /* mark event as deactivated and stopped */
 301         if (!(hwc->state & PERF_HES_STOPPED)) {
 302                 WARN_ON_ONCE(pmu->n_active <= 0);
 303                 pmu->n_active--;
 304                 if (pmu->n_active == 0)
 305                         hrtimer_cancel(&pmu->hrtimer);
 306
 307                 list_del(&event->active_entry);
 308
 309                 WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED);
 310                 hwc->state |= PERF_HES_STOPPED;
 311         }
 312
 313         /* check if update of sw counter is necessary */
 314         if ((mode & PERF_EF_UPDATE) && !(hwc->state & PERF_HES_UPTODATE)) {
 315                 /*
 316                  * Drain the remaining delta count out of a event
 317                  * that we are disabling:
 318                  */
 319                 rapl_event_update(event);
 320                 hwc->state |= PERF_HES_UPTODATE;
 321         }
 322
 323         raw_spin_unlock_irqrestore(&pmu->lock, flags);
 324 }
 325
 326 static int rapl_pmu_event_add(struct perf_event *event, int mode)
 327 {
 328         struct rapl_pmu *pmu = event->pmu_private;
 329         struct hw_perf_event *hwc = &event->hw;
 330         unsigned long flags;
 331
 332         raw_spin_lock_irqsave(&pmu->lock, flags);
 333
 334         hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED;
 335
 336         if (mode & PERF_EF_START)
 337                 __rapl_pmu_event_start(pmu, event);
 338
 339         raw_spin_unlock_irqrestore(&pmu->lock, flags);
 340
 341         return 0;
 342 }
 343
 344 static void rapl_pmu_event_del(struct perf_event *event, int flags)
 345 {
 346         rapl_pmu_event_stop(event, PERF_EF_UPDATE);
 347 }
 348
 349 static int rapl_pmu_event_init(struct perf_event *event)
 350 {
 351         u64 cfg = event->attr.config & RAPL_EVENT_MASK;
 352         int bit, msr, ret = 0;
 353         struct rapl_pmu *pmu;
 354
 355         /* only look at RAPL events */
 356         if (event->attr.type != rapl_pmus->pmu.type)
 357                 return -ENOENT;
 358
 359         /* check only supported bits are set */
 360         if (event->attr.config & ~RAPL_EVENT_MASK)
 361                 return -EINVAL;
 362
 363         if (event->cpu < 0)
 364                 return -EINVAL;
 365
 366         event->event_caps |= PERF_EV_CAP_READ_ACTIVE_PKG;
 367
 368         /*
 369          * check event is known (determines counter)
 370          */
 371         switch (cfg) {
 372         case INTEL_RAPL_PP0:
 373                 bit = RAPL_IDX_PP0_NRG_STAT;
 374                 msr = MSR_PP0_ENERGY_STATUS;
 375                 break;
 376         case INTEL_RAPL_PKG:
 377                 bit = RAPL_IDX_PKG_NRG_STAT;
 378                 msr = MSR_PKG_ENERGY_STATUS;
 379                 break;
 380         case INTEL_RAPL_RAM:
 381                 bit = RAPL_IDX_RAM_NRG_STAT;
 382                 msr = MSR_DRAM_ENERGY_STATUS;
 383                 break;
 384         case INTEL_RAPL_PP1:
 385                 bit = RAPL_IDX_PP1_NRG_STAT;
 386                 msr = MSR_PP1_ENERGY_STATUS;
 387                 break;
 388         case INTEL_RAPL_PSYS:
 389                 bit = RAPL_IDX_PSYS_NRG_STAT;
 390                 msr = MSR_PLATFORM_ENERGY_STATUS;
 391                 break;
 392         default:
 393                 return -EINVAL;
 394         }
 395         /* check event supported */
 396         if (!(rapl_cntr_mask & (1 << bit)))
 397                 return -EINVAL;
 398
 399         /* unsupported modes and filters */
 400         if (event->attr.exclude_user   ||
 401             event->attr.exclude_kernel ||
 402             event->attr.exclude_hv     ||
 403             event->attr.exclude_idle   ||
 404             event->attr.exclude_host   ||
 405             event->attr.exclude_guest  ||
 406             event->attr.sample_period) /* no sampling */
 407                 return -EINVAL;
 408
 409         /* must be done before validate_group */
 410         pmu = cpu_to_rapl_pmu(event->cpu);
 411         if (!pmu)
 412                 return -EINVAL;
 413         event->cpu = pmu->cpu;
 414         event->pmu_private = pmu;
 415         event->hw.event_base = msr;
 416         event->hw.config = cfg;
 417         event->hw.idx = bit;
 418
 419         return ret;
 420 }
 421
 422 static void rapl_pmu_event_read(struct perf_event *event)
 423 {
 424         rapl_event_update(event);
 425 }
 426
 427 static ssize_t rapl_get_attr_cpumask(struct device *dev,
 428                                 struct device_attribute *attr, char *buf)
 429 {
 430         return cpumap_print_to_pagebuf(true, buf, &rapl_cpu_mask);
 431 }
 432
 433 static DEVICE_ATTR(cpumask, S_IRUGO, rapl_get_attr_cpumask, NULL);
 434
 435 static struct attribute *rapl_pmu_attrs[] = {
 436         &dev_attr_cpumask.attr,
 437         NULL,
 438 };
 439
 440 static struct attribute_group rapl_pmu_attr_group = {
 441         .attrs = rapl_pmu_attrs,
 442 };
 443
 444 RAPL_EVENT_ATTR_STR(energy-cores, rapl_cores, "event=0x01");
 445 RAPL_EVENT_ATTR_STR(energy-pkg  ,   rapl_pkg, "event=0x02");
 446 RAPL_EVENT_ATTR_STR(energy-ram  ,   rapl_ram, "event=0x03");
 447 RAPL_EVENT_ATTR_STR(energy-gpu  ,   rapl_gpu, "event=0x04");
 448 RAPL_EVENT_ATTR_STR(energy-psys,   rapl_psys, "event=0x05");
 449
 450 RAPL_EVENT_ATTR_STR(energy-cores.unit, rapl_cores_unit, "Joules");
 451 RAPL_EVENT_ATTR_STR(energy-pkg.unit  ,   rapl_pkg_unit, "Joules");
 452 RAPL_EVENT_ATTR_STR(energy-ram.unit  ,   rapl_ram_unit, "Joules");
 453 RAPL_EVENT_ATTR_STR(energy-gpu.unit  ,   rapl_gpu_unit, "Joules");
 454 RAPL_EVENT_ATTR_STR(energy-psys.unit,   rapl_psys_unit, "Joules");
 455
 456 /*
 457  * we compute in 0.23 nJ increments regardless of MSR
 458  */
 459 RAPL_EVENT_ATTR_STR(energy-cores.scale, rapl_cores_scale, "2.3283064365386962890625e-10");
 460 RAPL_EVENT_ATTR_STR(energy-pkg.scale,     rapl_pkg_scale, "2.3283064365386962890625e-10");
 461 RAPL_EVENT_ATTR_STR(energy-ram.scale,     rapl_ram_scale, "2.3283064365386962890625e-10");
 462 RAPL_EVENT_ATTR_STR(energy-gpu.scale,     rapl_gpu_scale, "2.3283064365386962890625e-10");
 463 RAPL_EVENT_ATTR_STR(energy-psys.scale,   rapl_psys_scale, "2.3283064365386962890625e-10");
 464
 465 static struct attribute *rapl_events_srv_attr[] = {
 466         EVENT_PTR(rapl_cores),
 467         EVENT_PTR(rapl_pkg),
 468         EVENT_PTR(rapl_ram),
 469
 470         EVENT_PTR(rapl_cores_unit),
 471         EVENT_PTR(rapl_pkg_unit),
 472         EVENT_PTR(rapl_ram_unit),
 473
 474         EVENT_PTR(rapl_cores_scale),
 475         EVENT_PTR(rapl_pkg_scale),
 476         EVENT_PTR(rapl_ram_scale),
 477         NULL,
 478 };
 479
 480 static struct attribute *rapl_events_cln_attr[] = {
 481         EVENT_PTR(rapl_cores),
 482         EVENT_PTR(rapl_pkg),
 483         EVENT_PTR(rapl_gpu),
 484
 485         EVENT_PTR(rapl_cores_unit),
 486         EVENT_PTR(rapl_pkg_unit),
 487         EVENT_PTR(rapl_gpu_unit),
 488
 489         EVENT_PTR(rapl_cores_scale),
 490         EVENT_PTR(rapl_pkg_scale),
 491         EVENT_PTR(rapl_gpu_scale),
 492         NULL,
 493 };
 494
 495 static struct attribute *rapl_events_hsw_attr[] = {
 496         EVENT_PTR(rapl_cores),
 497         EVENT_PTR(rapl_pkg),
 498         EVENT_PTR(rapl_gpu),
 499         EVENT_PTR(rapl_ram),
 500
 501         EVENT_PTR(rapl_cores_unit),
 502         EVENT_PTR(rapl_pkg_unit),
 503         EVENT_PTR(rapl_gpu_unit),
 504         EVENT_PTR(rapl_ram_unit),
 505
 506         EVENT_PTR(rapl_cores_scale),
 507         EVENT_PTR(rapl_pkg_scale),
 508         EVENT_PTR(rapl_gpu_scale),
 509         EVENT_PTR(rapl_ram_scale),
 510         NULL,
 511 };
 512
 513 static struct attribute *rapl_events_skl_attr[] = {
 514         EVENT_PTR(rapl_cores),
 515         EVENT_PTR(rapl_pkg),
 516         EVENT_PTR(rapl_gpu),
 517         EVENT_PTR(rapl_ram),
 518         EVENT_PTR(rapl_psys),
 519
 520         EVENT_PTR(rapl_cores_unit),
 521         EVENT_PTR(rapl_pkg_unit),
 522         EVENT_PTR(rapl_gpu_unit),
 523         EVENT_PTR(rapl_ram_unit),
 524         EVENT_PTR(rapl_psys_unit),
 525
 526         EVENT_PTR(rapl_cores_scale),
 527         EVENT_PTR(rapl_pkg_scale),
 528         EVENT_PTR(rapl_gpu_scale),
 529         EVENT_PTR(rapl_ram_scale),
 530         EVENT_PTR(rapl_psys_scale),
 531         NULL,
 532 };
 533
 534 static struct attribute *rapl_events_knl_attr[] = {
 535         EVENT_PTR(rapl_pkg),
 536         EVENT_PTR(rapl_ram),
 537
 538         EVENT_PTR(rapl_pkg_unit),
 539         EVENT_PTR(rapl_ram_unit),
 540
 541         EVENT_PTR(rapl_pkg_scale),
 542         EVENT_PTR(rapl_ram_scale),
 543         NULL,
 544 };
 545
 546 static struct attribute_group rapl_pmu_events_group = {
 547         .name = "events",
 548         .attrs = NULL, /* patched at runtime */
 549 };
 550
 551 DEFINE_RAPL_FORMAT_ATTR(event, event, "config:0-7");
 552 static struct attribute *rapl_formats_attr[] = {
 553         &format_attr_event.attr,
 554         NULL,
 555 };
 556
 557 static struct attribute_group rapl_pmu_format_group = {
 558         .name = "format",
 559         .attrs = rapl_formats_attr,
 560 };
 561
 562 const struct attribute_group *rapl_attr_groups[] = {
 563         &rapl_pmu_attr_group,
 564         &rapl_pmu_format_group,
 565         &rapl_pmu_events_group,
 566         NULL,
 567 };
 568
 569 static int rapl_cpu_offline(unsigned int cpu)
 570 {
 571         struct rapl_pmu *pmu = cpu_to_rapl_pmu(cpu);
 572         int target;
 573
 574         /* Check if exiting cpu is used for collecting rapl events */
 575         if (!cpumask_test_and_clear_cpu(cpu, &rapl_cpu_mask))
 576                 return 0;
 577
 578         pmu->cpu = -1;
 579         /* Find a new cpu to collect rapl events */
 580         target = cpumask_any_but(topology_core_cpumask(cpu), cpu);
 581
 582         /* Migrate rapl events to the new target */
 583         if (target < nr_cpu_ids) {
 584                 cpumask_set_cpu(target, &rapl_cpu_mask);
 585                 pmu->cpu = target;
 586                 perf_pmu_migrate_context(pmu->pmu, cpu, target);
 587         }
 588         return 0;
 589 }
 590
 591 static int rapl_cpu_online(unsigned int cpu)
 592 {
 593         struct rapl_pmu *pmu = cpu_to_rapl_pmu(cpu);
 594         int target;
 595
 596         if (!pmu) {
 597                 pmu = kzalloc_node(sizeof(*pmu), GFP_KERNEL, cpu_to_node(cpu));
 598                 if (!pmu)
 599                         return -ENOMEM;
 600
 601                 raw_spin_lock_init(&pmu->lock);
 602                 INIT_LIST_HEAD(&pmu->active_list);
 603                 pmu->pmu = &rapl_pmus->pmu;
 604                 pmu->timer_interval = ms_to_ktime(rapl_timer_ms);
 605                 rapl_hrtimer_init(pmu);
 606
 607                 rapl_pmus->pmus[topology_logical_package_id(cpu)] = pmu;
 608         }
 609
 610         /*
 611          * Check if there is an online cpu in the package which collects rapl
 612          * events already.
 613          */
 614         target = cpumask_any_and(&rapl_cpu_mask, topology_core_cpumask(cpu));
 615         if (target < nr_cpu_ids)
 616                 return 0;
 617
 618         cpumask_set_cpu(cpu, &rapl_cpu_mask);
 619         pmu->cpu = cpu;
 620         return 0;
 621 }
 622
 623 static int rapl_check_hw_unit(bool apply_quirk)
 624 {
 625         u64 msr_rapl_power_unit_bits;
 626         int i;
 627
 628         /* protect rdmsrl() to handle virtualization */
 629         if (rdmsrl_safe(MSR_RAPL_POWER_UNIT, &msr_rapl_power_unit_bits))
 630                 return -1;
 631         for (i = 0; i < NR_RAPL_DOMAINS; i++)
 632                 rapl_hw_unit[i] = (msr_rapl_power_unit_bits >> 8) & 0x1FULL;
 633
 634         /*
 635          * DRAM domain on HSW server and KNL has fixed energy unit which can be
 636          * different than the unit from power unit MSR. See
 637          * "Intel Xeon Processor E5-1600 and E5-2600 v3 Product Families, V2
 638          * of 2. Datasheet, September 2014, Reference Number: 330784-001 "
 639          */
 640         if (apply_quirk)
 641                 rapl_hw_unit[RAPL_IDX_RAM_NRG_STAT] = 16;
 642
 643         /*
 644          * Calculate the timer rate:
 645          * Use reference of 200W for scaling the timeout to avoid counter
 646          * overflows. 200W = 200 Joules/sec
 647          * Divide interval by 2 to avoid lockstep (2 * 100)
 648          * if hw unit is 32, then we use 2 ms 1/200/2
 649          */
 650         rapl_timer_ms = 2;
 651         if (rapl_hw_unit[0] < 32) {
 652                 rapl_timer_ms = (1000 / (2 * 100));
 653                 rapl_timer_ms *= (1ULL << (32 - rapl_hw_unit[0] - 1));
 654         }
 655         return 0;
 656 }
 657
 658 static void __init rapl_advertise(void)
 659 {
 660         int i;
 661
 662         pr_info("API unit is 2^-32 Joules, %d fixed counters, %llu ms ovfl timer\n",
 663                 hweight32(rapl_cntr_mask), rapl_timer_ms);
 664
 665         for (i = 0; i < NR_RAPL_DOMAINS; i++) {
 666                 if (rapl_cntr_mask & (1 << i)) {
 667                         pr_info("hw unit of domain %s 2^-%d Joules\n",
 668                                 rapl_domain_names[i], rapl_hw_unit[i]);
 669                 }
 670         }
 671 }
 672
 673 static void cleanup_rapl_pmus(void)
 674 {
 675         int i;
 676
 677         for (i = 0; i < rapl_pmus->maxpkg; i++)
 678                 kfree(rapl_pmus->pmus[i]);
 679         kfree(rapl_pmus);
 680 }
 681
 682 static int __init init_rapl_pmus(void)
 683 {
 684         int maxpkg = topology_max_packages();
 685         size_t size;
 686
 687         size = sizeof(*rapl_pmus) + maxpkg * sizeof(struct rapl_pmu *);
 688         rapl_pmus = kzalloc(size, GFP_KERNEL);
 689         if (!rapl_pmus)
 690                 return -ENOMEM;
 691
 692         rapl_pmus->maxpkg               = maxpkg;
 693         rapl_pmus->pmu.attr_groups      = rapl_attr_groups;
 694         rapl_pmus->pmu.task_ctx_nr      = perf_invalid_context;
 695         rapl_pmus->pmu.event_init       = rapl_pmu_event_init;
 696         rapl_pmus->pmu.add              = rapl_pmu_event_add;
 697         rapl_pmus->pmu.del              = rapl_pmu_event_del;
 698         rapl_pmus->pmu.start            = rapl_pmu_event_start;
 699         rapl_pmus->pmu.stop             = rapl_pmu_event_stop;
 700         rapl_pmus->pmu.read             = rapl_pmu_event_read;
 701         rapl_pmus->pmu.module           = THIS_MODULE;
 702         return 0;
 703 }
 704
 705 #define X86_RAPL_MODEL_MATCH(model, init)       \
 706         { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, (unsigned long)&init }
 707
 708 struct intel_rapl_init_fun {
 709         bool apply_quirk;
 710         int cntr_mask;
 711         struct attribute **attrs;
 712 };
 713
 714 static const struct intel_rapl_init_fun snb_rapl_init __initconst = {
 715         .apply_quirk = false,
 716         .cntr_mask = RAPL_IDX_CLN,
 717         .attrs = rapl_events_cln_attr,
 718 };
 719
 720 static const struct intel_rapl_init_fun hsx_rapl_init __initconst = {
 721         .apply_quirk = true,
 722         .cntr_mask = RAPL_IDX_SRV,
 723         .attrs = rapl_events_srv_attr,
 724 };
 725
 726 static const struct intel_rapl_init_fun hsw_rapl_init __initconst = {
 727         .apply_quirk = false,
 728         .cntr_mask = RAPL_IDX_HSW,
 729         .attrs = rapl_events_hsw_attr,
 730 };
 731
 732 static const struct intel_rapl_init_fun snbep_rapl_init __initconst = {
 733         .apply_quirk = false,
 734         .cntr_mask = RAPL_IDX_SRV,
 735         .attrs = rapl_events_srv_attr,
 736 };
 737
 738 static const struct intel_rapl_init_fun knl_rapl_init __initconst = {
 739         .apply_quirk = true,
 740         .cntr_mask = RAPL_IDX_KNL,
 741         .attrs = rapl_events_knl_attr,
 742 };
 743
 744 static const struct intel_rapl_init_fun skl_rapl_init __initconst = {
 745         .apply_quirk = false,
 746         .cntr_mask = RAPL_IDX_SKL_CLN,
 747         .attrs = rapl_events_skl_attr,
 748 };
 749
 750 static const struct x86_cpu_id rapl_cpu_match[] __initconst = {
 751         X86_RAPL_MODEL_MATCH(INTEL_FAM6_SANDYBRIDGE,   snb_rapl_init),
 752         X86_RAPL_MODEL_MATCH(INTEL_FAM6_SANDYBRIDGE_X, snbep_rapl_init),
 753
 754         X86_RAPL_MODEL_MATCH(INTEL_FAM6_IVYBRIDGE,   snb_rapl_init),
 755         X86_RAPL_MODEL_MATCH(INTEL_FAM6_IVYBRIDGE_X, snbep_rapl_init),
 756
 757         X86_RAPL_MODEL_MATCH(INTEL_FAM6_HASWELL_CORE, hsw_rapl_init),
 758         X86_RAPL_MODEL_MATCH(INTEL_FAM6_HASWELL_X,    hsw_rapl_init),
 759         X86_RAPL_MODEL_MATCH(INTEL_FAM6_HASWELL_ULT,  hsw_rapl_init),
 760         X86_RAPL_MODEL_MATCH(INTEL_FAM6_HASWELL_GT3E, hsw_rapl_init),
 761
 762         X86_RAPL_MODEL_MATCH(INTEL_FAM6_BROADWELL_CORE,   hsw_rapl_init),
 763         X86_RAPL_MODEL_MATCH(INTEL_FAM6_BROADWELL_GT3E,   hsw_rapl_init),
 764         X86_RAPL_MODEL_MATCH(INTEL_FAM6_BROADWELL_X,      hsx_rapl_init),
 765         X86_RAPL_MODEL_MATCH(INTEL_FAM6_BROADWELL_XEON_D, hsw_rapl_init),
 766
 767         X86_RAPL_MODEL_MATCH(INTEL_FAM6_XEON_PHI_KNL, knl_rapl_init),
 768         X86_RAPL_MODEL_MATCH(INTEL_FAM6_XEON_PHI_KNM, knl_rapl_init),
 769
 770         X86_RAPL_MODEL_MATCH(INTEL_FAM6_SKYLAKE_MOBILE,  skl_rapl_init),
 771         X86_RAPL_MODEL_MATCH(INTEL_FAM6_SKYLAKE_DESKTOP, skl_rapl_init),
 772         X86_RAPL_MODEL_MATCH(INTEL_FAM6_SKYLAKE_X,       hsx_rapl_init),
 773
 774         X86_RAPL_MODEL_MATCH(INTEL_FAM6_KABYLAKE_MOBILE,  skl_rapl_init),
 775         X86_RAPL_MODEL_MATCH(INTEL_FAM6_KABYLAKE_DESKTOP, skl_rapl_init),
 776
 777         X86_RAPL_MODEL_MATCH(INTEL_FAM6_ATOM_GOLDMONT, hsw_rapl_init),
 778         {},
 779 };
 780
 781 MODULE_DEVICE_TABLE(x86cpu, rapl_cpu_match);
 782
 783 static int __init rapl_pmu_init(void)
 784 {
 785         const struct x86_cpu_id *id;
 786         struct intel_rapl_init_fun *rapl_init;
 787         bool apply_quirk;
 788         int ret;
 789
 790         id = x86_match_cpu(rapl_cpu_match);
 791         if (!id)
 792                 return -ENODEV;
 793
 794         rapl_init = (struct intel_rapl_init_fun *)id->driver_data;
 795         apply_quirk = rapl_init->apply_quirk;
 796         rapl_cntr_mask = rapl_init->cntr_mask;
 797         rapl_pmu_events_group.attrs = rapl_init->attrs;
 798
 799         ret = rapl_check_hw_unit(apply_quirk);
 800         if (ret)
 801                 return ret;
 802
 803         ret = init_rapl_pmus();
 804         if (ret)
 805                 return ret;
 806
 807         /*
 808          * Install callbacks. Core will call them for each online cpu.
 809          */
 810         ret = cpuhp_setup_state(CPUHP_AP_PERF_X86_RAPL_ONLINE,
 811                                 "perf/x86/rapl:online",
 812                                 rapl_cpu_online, rapl_cpu_offline);
 813         if (ret)
 814                 goto out;
 815
 816         ret = perf_pmu_register(&rapl_pmus->pmu, "power", -1);
 817         if (ret)
 818                 goto out1;
 819
 820         rapl_advertise();
 821         return 0;
 822
 823 out1:
 824         cpuhp_remove_state(CPUHP_AP_PERF_X86_RAPL_ONLINE);
 825 out:
 826         pr_warn("Initialization failed (%d), disabled\n", ret);
 827         cleanup_rapl_pmus();
 828         return ret;
 829 }
 830 module_init(rapl_pmu_init);
 831
 832 static void __exit intel_rapl_exit(void)
 833 {
 834         cpuhp_remove_state_nocalls(CPUHP_AP_PERF_X86_RAPL_ONLINE);
 835         perf_pmu_unregister(&rapl_pmus->pmu);
 836         cleanup_rapl_pmus();
 837 }
 838 module_exit(intel_rapl_exit);