arch/x86/events/zhaoxin/core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Zhaoxin PMU; like Intel Architectural PerfMon-v2
   4  */
   5
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7
   8 #include <linux/stddef.h>
   9 #include <linux/types.h>
  10 #include <linux/init.h>
  11 #include <linux/slab.h>
  12 #include <linux/export.h>
  13 #include <linux/nmi.h>
  14
  15 #include <asm/cpufeature.h>
  16 #include <asm/hardirq.h>
  17 #include <asm/apic.h>
  18
  19 #include "../perf_event.h"
  20
  21 /*
  22  * Zhaoxin PerfMon, used on zxc and later.
  23  */
  24 static u64 zx_pmon_event_map[PERF_COUNT_HW_MAX] __read_mostly = {
  25
  26         [PERF_COUNT_HW_CPU_CYCLES]        = 0x0082,
  27         [PERF_COUNT_HW_INSTRUCTIONS]      = 0x00c0,
  28         [PERF_COUNT_HW_CACHE_REFERENCES]  = 0x0515,
  29         [PERF_COUNT_HW_CACHE_MISSES]      = 0x051a,
  30         [PERF_COUNT_HW_BUS_CYCLES]        = 0x0083,
  31 };
  32
  33 static struct event_constraint zxc_event_constraints[] __read_mostly = {
  34
  35         FIXED_EVENT_CONSTRAINT(0x0082, 1), /* unhalted core clock cycles */
  36         EVENT_CONSTRAINT_END
  37 };
  38
  39 static struct event_constraint zxd_event_constraints[] __read_mostly = {
  40
  41         FIXED_EVENT_CONSTRAINT(0x00c0, 0), /* retired instructions */
  42         FIXED_EVENT_CONSTRAINT(0x0082, 1), /* unhalted core clock cycles */
  43         FIXED_EVENT_CONSTRAINT(0x0083, 2), /* unhalted bus clock cycles */
  44         EVENT_CONSTRAINT_END
  45 };
  46
  47 static __initconst const u64 zxd_hw_cache_event_ids
  48                                 [PERF_COUNT_HW_CACHE_MAX]
  49                                 [PERF_COUNT_HW_CACHE_OP_MAX]
  50                                 [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
  51 [C(L1D)] = {
  52         [C(OP_READ)] = {
  53                 [C(RESULT_ACCESS)] = 0x0042,
  54                 [C(RESULT_MISS)] = 0x0538,
  55         },
  56         [C(OP_WRITE)] = {
  57                 [C(RESULT_ACCESS)] = 0x0043,
  58                 [C(RESULT_MISS)] = 0x0562,
  59         },
  60         [C(OP_PREFETCH)] = {
  61                 [C(RESULT_ACCESS)] = -1,
  62                 [C(RESULT_MISS)] = -1,
  63         },
  64 },
  65 [C(L1I)] = {
  66         [C(OP_READ)] = {
  67                 [C(RESULT_ACCESS)] = 0x0300,
  68                 [C(RESULT_MISS)] = 0x0301,
  69         },
  70         [C(OP_WRITE)] = {
  71                 [C(RESULT_ACCESS)] = -1,
  72                 [C(RESULT_MISS)] = -1,
  73         },
  74         [C(OP_PREFETCH)] = {
  75                 [C(RESULT_ACCESS)] = 0x030a,
  76                 [C(RESULT_MISS)] = 0x030b,
  77         },
  78 },
  79 [C(LL)] = {
  80         [C(OP_READ)] = {
  81                 [C(RESULT_ACCESS)] = -1,
  82                 [C(RESULT_MISS)] = -1,
  83         },
  84         [C(OP_WRITE)] = {
  85                 [C(RESULT_ACCESS)] = -1,
  86                 [C(RESULT_MISS)] = -1,
  87         },
  88         [C(OP_PREFETCH)] = {
  89                 [C(RESULT_ACCESS)] = -1,
  90                 [C(RESULT_MISS)] = -1,
  91         },
  92 },
  93 [C(DTLB)] = {
  94         [C(OP_READ)] = {
  95                 [C(RESULT_ACCESS)] = 0x0042,
  96                 [C(RESULT_MISS)] = 0x052c,
  97         },
  98         [C(OP_WRITE)] = {
  99                 [C(RESULT_ACCESS)] = 0x0043,
 100                 [C(RESULT_MISS)] = 0x0530,
 101         },
 102         [C(OP_PREFETCH)] = {
 103                 [C(RESULT_ACCESS)] = 0x0564,
 104                 [C(RESULT_MISS)] = 0x0565,
 105         },
 106 },
 107 [C(ITLB)] = {
 108         [C(OP_READ)] = {
 109                 [C(RESULT_ACCESS)] = 0x00c0,
 110                 [C(RESULT_MISS)] = 0x0534,
 111         },
 112         [C(OP_WRITE)] = {
 113                 [C(RESULT_ACCESS)] = -1,
 114                 [C(RESULT_MISS)] = -1,
 115         },
 116         [C(OP_PREFETCH)] = {
 117                 [C(RESULT_ACCESS)] = -1,
 118                 [C(RESULT_MISS)] = -1,
 119         },
 120 },
 121 [C(BPU)] = {
 122         [C(OP_READ)] = {
 123                 [C(RESULT_ACCESS)] = 0x0700,
 124                 [C(RESULT_MISS)] = 0x0709,
 125         },
 126         [C(OP_WRITE)] = {
 127                 [C(RESULT_ACCESS)] = -1,
 128                 [C(RESULT_MISS)] = -1,
 129         },
 130         [C(OP_PREFETCH)] = {
 131                 [C(RESULT_ACCESS)] = -1,
 132                 [C(RESULT_MISS)] = -1,
 133         },
 134 },
 135 [C(NODE)] = {
 136         [C(OP_READ)] = {
 137                 [C(RESULT_ACCESS)] = -1,
 138                 [C(RESULT_MISS)] = -1,
 139         },
 140         [C(OP_WRITE)] = {
 141                 [C(RESULT_ACCESS)] = -1,
 142                 [C(RESULT_MISS)] = -1,
 143         },
 144         [C(OP_PREFETCH)] = {
 145                 [C(RESULT_ACCESS)] = -1,
 146                 [C(RESULT_MISS)] = -1,
 147         },
 148 },
 149 };
 150
 151 static __initconst const u64 zxe_hw_cache_event_ids
 152                                 [PERF_COUNT_HW_CACHE_MAX]
 153                                 [PERF_COUNT_HW_CACHE_OP_MAX]
 154                                 [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
 155 [C(L1D)] = {
 156         [C(OP_READ)] = {
 157                 [C(RESULT_ACCESS)] = 0x0568,
 158                 [C(RESULT_MISS)] = 0x054b,
 159         },
 160         [C(OP_WRITE)] = {
 161                 [C(RESULT_ACCESS)] = 0x0669,
 162                 [C(RESULT_MISS)] = 0x0562,
 163         },
 164         [C(OP_PREFETCH)] = {
 165                 [C(RESULT_ACCESS)] = -1,
 166                 [C(RESULT_MISS)] = -1,
 167         },
 168 },
 169 [C(L1I)] = {
 170         [C(OP_READ)] = {
 171                 [C(RESULT_ACCESS)] = 0x0300,
 172                 [C(RESULT_MISS)] = 0x0301,
 173         },
 174         [C(OP_WRITE)] = {
 175                 [C(RESULT_ACCESS)] = -1,
 176                 [C(RESULT_MISS)] = -1,
 177         },
 178         [C(OP_PREFETCH)] = {
 179                 [C(RESULT_ACCESS)] = 0x030a,
 180                 [C(RESULT_MISS)] = 0x030b,
 181         },
 182 },
 183 [C(LL)] = {
 184         [C(OP_READ)] = {
 185                 [C(RESULT_ACCESS)] = 0x0,
 186                 [C(RESULT_MISS)] = 0x0,
 187         },
 188         [C(OP_WRITE)] = {
 189                 [C(RESULT_ACCESS)] = 0x0,
 190                 [C(RESULT_MISS)] = 0x0,
 191         },
 192         [C(OP_PREFETCH)] = {
 193                 [C(RESULT_ACCESS)] = 0x0,
 194                 [C(RESULT_MISS)] = 0x0,
 195         },
 196 },
 197 [C(DTLB)] = {
 198         [C(OP_READ)] = {
 199                 [C(RESULT_ACCESS)] = 0x0568,
 200                 [C(RESULT_MISS)] = 0x052c,
 201         },
 202         [C(OP_WRITE)] = {
 203                 [C(RESULT_ACCESS)] = 0x0669,
 204                 [C(RESULT_MISS)] = 0x0530,
 205         },
 206         [C(OP_PREFETCH)] = {
 207                 [C(RESULT_ACCESS)] = 0x0564,
 208                 [C(RESULT_MISS)] = 0x0565,
 209         },
 210 },
 211 [C(ITLB)] = {
 212         [C(OP_READ)] = {
 213                 [C(RESULT_ACCESS)] = 0x00c0,
 214                 [C(RESULT_MISS)] = 0x0534,
 215         },
 216         [C(OP_WRITE)] = {
 217                 [C(RESULT_ACCESS)] = -1,
 218                 [C(RESULT_MISS)] = -1,
 219         },
 220         [C(OP_PREFETCH)] = {
 221                 [C(RESULT_ACCESS)] = -1,
 222                 [C(RESULT_MISS)] = -1,
 223         },
 224 },
 225 [C(BPU)] = {
 226         [C(OP_READ)] = {
 227                 [C(RESULT_ACCESS)] = 0x0028,
 228                 [C(RESULT_MISS)] = 0x0029,
 229         },
 230         [C(OP_WRITE)] = {
 231                 [C(RESULT_ACCESS)] = -1,
 232                 [C(RESULT_MISS)] = -1,
 233         },
 234         [C(OP_PREFETCH)] = {
 235                 [C(RESULT_ACCESS)] = -1,
 236                 [C(RESULT_MISS)] = -1,
 237         },
 238 },
 239 [C(NODE)] = {
 240         [C(OP_READ)] = {
 241                 [C(RESULT_ACCESS)] = -1,
 242                 [C(RESULT_MISS)] = -1,
 243         },
 244         [C(OP_WRITE)] = {
 245                 [C(RESULT_ACCESS)] = -1,
 246                 [C(RESULT_MISS)] = -1,
 247         },
 248         [C(OP_PREFETCH)] = {
 249                 [C(RESULT_ACCESS)] = -1,
 250                 [C(RESULT_MISS)] = -1,
 251         },
 252 },
 253 };
 254
 255 static void zhaoxin_pmu_disable_all(void)
 256 {
 257         wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, 0);
 258 }
 259
 260 static void zhaoxin_pmu_enable_all(int added)
 261 {
 262         wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, x86_pmu.intel_ctrl);
 263 }
 264
 265 static inline u64 zhaoxin_pmu_get_status(void)
 266 {
 267         u64 status;
 268
 269         rdmsrl(MSR_CORE_PERF_GLOBAL_STATUS, status);
 270
 271         return status;
 272 }
 273
 274 static inline void zhaoxin_pmu_ack_status(u64 ack)
 275 {
 276         wrmsrl(MSR_CORE_PERF_GLOBAL_OVF_CTRL, ack);
 277 }
 278
 279 static inline void zxc_pmu_ack_status(u64 ack)
 280 {
 281         /*
 282          * ZXC needs global control enabled in order to clear status bits.
 283          */
 284         zhaoxin_pmu_enable_all(0);
 285         zhaoxin_pmu_ack_status(ack);
 286         zhaoxin_pmu_disable_all();
 287 }
 288
 289 static void zhaoxin_pmu_disable_fixed(struct hw_perf_event *hwc)
 290 {
 291         int idx = hwc->idx - INTEL_PMC_IDX_FIXED;
 292         u64 ctrl_val, mask;
 293
 294         mask = 0xfULL << (idx * 4);
 295
 296         rdmsrl(hwc->config_base, ctrl_val);
 297         ctrl_val &= ~mask;
 298         wrmsrl(hwc->config_base, ctrl_val);
 299 }
 300
 301 static void zhaoxin_pmu_disable_event(struct perf_event *event)
 302 {
 303         struct hw_perf_event *hwc = &event->hw;
 304
 305         if (unlikely(hwc->config_base == MSR_ARCH_PERFMON_FIXED_CTR_CTRL)) {
 306                 zhaoxin_pmu_disable_fixed(hwc);
 307                 return;
 308         }
 309
 310         x86_pmu_disable_event(event);
 311 }
 312
 313 static void zhaoxin_pmu_enable_fixed(struct hw_perf_event *hwc)
 314 {
 315         int idx = hwc->idx - INTEL_PMC_IDX_FIXED;
 316         u64 ctrl_val, bits, mask;
 317
 318         /*
 319          * Enable IRQ generation (0x8),
 320          * and enable ring-3 counting (0x2) and ring-0 counting (0x1)
 321          * if requested:
 322          */
 323         bits = 0x8ULL;
 324         if (hwc->config & ARCH_PERFMON_EVENTSEL_USR)
 325                 bits |= 0x2;
 326         if (hwc->config & ARCH_PERFMON_EVENTSEL_OS)
 327                 bits |= 0x1;
 328
 329         bits <<= (idx * 4);
 330         mask = 0xfULL << (idx * 4);
 331
 332         rdmsrl(hwc->config_base, ctrl_val);
 333         ctrl_val &= ~mask;
 334         ctrl_val |= bits;
 335         wrmsrl(hwc->config_base, ctrl_val);
 336 }
 337
 338 static void zhaoxin_pmu_enable_event(struct perf_event *event)
 339 {
 340         struct hw_perf_event *hwc = &event->hw;
 341
 342         if (unlikely(hwc->config_base == MSR_ARCH_PERFMON_FIXED_CTR_CTRL)) {
 343                 zhaoxin_pmu_enable_fixed(hwc);
 344                 return;
 345         }
 346
 347         __x86_pmu_enable_event(hwc, ARCH_PERFMON_EVENTSEL_ENABLE);
 348 }
 349
 350 /*
 351  * This handler is triggered by the local APIC, so the APIC IRQ handling
 352  * rules apply:
 353  */
 354 static int zhaoxin_pmu_handle_irq(struct pt_regs *regs)
 355 {
 356         struct perf_sample_data data;
 357         struct cpu_hw_events *cpuc;
 358         int handled = 0;
 359         u64 status;
 360         int bit;
 361
 362         cpuc = this_cpu_ptr(&cpu_hw_events);
 363         apic_write(APIC_LVTPC, APIC_DM_NMI);
 364         zhaoxin_pmu_disable_all();
 365         status = zhaoxin_pmu_get_status();
 366         if (!status)
 367                 goto done;
 368
 369 again:
 370         if (x86_pmu.enabled_ack)
 371                 zxc_pmu_ack_status(status);
 372         else
 373                 zhaoxin_pmu_ack_status(status);
 374
 375         inc_irq_stat(apic_perf_irqs);
 376
 377         /*
 378          * CondChgd bit 63 doesn't mean any overflow status. Ignore
 379          * and clear the bit.
 380          */
 381         if (__test_and_clear_bit(63, (unsigned long *)&status)) {
 382                 if (!status)
 383                         goto done;
 384         }
 385
 386         for_each_set_bit(bit, (unsigned long *)&status, X86_PMC_IDX_MAX) {
 387                 struct perf_event *event = cpuc->events[bit];
 388
 389                 handled++;
 390
 391                 if (!test_bit(bit, cpuc->active_mask))
 392                         continue;
 393
 394                 x86_perf_event_update(event);
 395                 perf_sample_data_init(&data, 0, event->hw.last_period);
 396
 397                 if (!x86_perf_event_set_period(event))
 398                         continue;
 399
 400                 if (perf_event_overflow(event, &data, regs))
 401                         x86_pmu_stop(event, 0);
 402         }
 403
 404         /*
 405          * Repeat if there is more work to be done:
 406          */
 407         status = zhaoxin_pmu_get_status();
 408         if (status)
 409                 goto again;
 410
 411 done:
 412         zhaoxin_pmu_enable_all(0);
 413         return handled;
 414 }
 415
 416 static u64 zhaoxin_pmu_event_map(int hw_event)
 417 {
 418         return zx_pmon_event_map[hw_event];
 419 }
 420
 421 static struct event_constraint *
 422 zhaoxin_get_event_constraints(struct cpu_hw_events *cpuc, int idx,
 423                         struct perf_event *event)
 424 {
 425         struct event_constraint *c;
 426
 427         if (x86_pmu.event_constraints) {
 428                 for_each_event_constraint(c, x86_pmu.event_constraints) {
 429                         if ((event->hw.config & c->cmask) == c->code)
 430                                 return c;
 431                 }
 432         }
 433
 434         return &unconstrained;
 435 }
 436
 437 PMU_FORMAT_ATTR(event,  "config:0-7");
 438 PMU_FORMAT_ATTR(umask,  "config:8-15");
 439 PMU_FORMAT_ATTR(edge,   "config:18");
 440 PMU_FORMAT_ATTR(inv,    "config:23");
 441 PMU_FORMAT_ATTR(cmask,  "config:24-31");
 442
 443 static struct attribute *zx_arch_formats_attr[] = {
 444         &format_attr_event.attr,
 445         &format_attr_umask.attr,
 446         &format_attr_edge.attr,
 447         &format_attr_inv.attr,
 448         &format_attr_cmask.attr,
 449         NULL,
 450 };
 451
 452 static ssize_t zhaoxin_event_sysfs_show(char *page, u64 config)
 453 {
 454         u64 event = (config & ARCH_PERFMON_EVENTSEL_EVENT);
 455
 456         return x86_event_sysfs_show(page, config, event);
 457 }
 458
 459 static const struct x86_pmu zhaoxin_pmu __initconst = {
 460         .name                   = "zhaoxin",
 461         .handle_irq             = zhaoxin_pmu_handle_irq,
 462         .disable_all            = zhaoxin_pmu_disable_all,
 463         .enable_all             = zhaoxin_pmu_enable_all,
 464         .enable                 = zhaoxin_pmu_enable_event,
 465         .disable                = zhaoxin_pmu_disable_event,
 466         .hw_config              = x86_pmu_hw_config,
 467         .schedule_events        = x86_schedule_events,
 468         .eventsel               = MSR_ARCH_PERFMON_EVENTSEL0,
 469         .perfctr                = MSR_ARCH_PERFMON_PERFCTR0,
 470         .event_map              = zhaoxin_pmu_event_map,
 471         .max_events             = ARRAY_SIZE(zx_pmon_event_map),
 472         .apic                   = 1,
 473         /*
 474          * For zxd/zxe, read/write operation for PMCx MSR is 48 bits.
 475          */
 476         .max_period             = (1ULL << 47) - 1,
 477         .get_event_constraints  = zhaoxin_get_event_constraints,
 478
 479         .format_attrs           = zx_arch_formats_attr,
 480         .events_sysfs_show      = zhaoxin_event_sysfs_show,
 481 };
 482
 483 static const struct { int id; char *name; } zx_arch_events_map[] __initconst = {
 484         { PERF_COUNT_HW_CPU_CYCLES, "cpu cycles" },
 485         { PERF_COUNT_HW_INSTRUCTIONS, "instructions" },
 486         { PERF_COUNT_HW_BUS_CYCLES, "bus cycles" },
 487         { PERF_COUNT_HW_CACHE_REFERENCES, "cache references" },
 488         { PERF_COUNT_HW_CACHE_MISSES, "cache misses" },
 489         { PERF_COUNT_HW_BRANCH_INSTRUCTIONS, "branch instructions" },
 490         { PERF_COUNT_HW_BRANCH_MISSES, "branch misses" },
 491 };
 492
 493 static __init void zhaoxin_arch_events_quirk(void)
 494 {
 495         int bit;
 496
 497         /* disable event that reported as not present by cpuid */
 498         for_each_set_bit(bit, x86_pmu.events_mask, ARRAY_SIZE(zx_arch_events_map)) {
 499                 zx_pmon_event_map[zx_arch_events_map[bit].id] = 0;
 500                 pr_warn("CPUID marked event: \'%s\' unavailable\n",
 501                         zx_arch_events_map[bit].name);
 502         }
 503 }
 504
 505 __init int zhaoxin_pmu_init(void)
 506 {
 507         union cpuid10_edx edx;
 508         union cpuid10_eax eax;
 509         union cpuid10_ebx ebx;
 510         struct event_constraint *c;
 511         unsigned int unused;
 512         int version;
 513
 514         pr_info("Welcome to zhaoxin pmu!\n");
 515
 516         /*
 517          * Check whether the Architectural PerfMon supports
 518          * hw_event or not.
 519          */
 520         cpuid(10, &eax.full, &ebx.full, &unused, &edx.full);
 521
 522         if (eax.split.mask_length < ARCH_PERFMON_EVENTS_COUNT - 1)
 523                 return -ENODEV;
 524
 525         version = eax.split.version_id;
 526         if (version != 2)
 527                 return -ENODEV;
 528
 529         x86_pmu = zhaoxin_pmu;
 530         pr_info("Version check pass!\n");
 531
 532         x86_pmu.version                 = version;
 533         x86_pmu.num_counters            = eax.split.num_counters;
 534         x86_pmu.cntval_bits             = eax.split.bit_width;
 535         x86_pmu.cntval_mask             = (1ULL << eax.split.bit_width) - 1;
 536         x86_pmu.events_maskl            = ebx.full;
 537         x86_pmu.events_mask_len         = eax.split.mask_length;
 538
 539         x86_pmu.num_counters_fixed = edx.split.num_counters_fixed;
 540         x86_add_quirk(zhaoxin_arch_events_quirk);
 541
 542         switch (boot_cpu_data.x86) {
 543         case 0x06:
 544                 if (boot_cpu_data.x86_model == 0x0f || boot_cpu_data.x86_model == 0x19) {
 545
 546                         x86_pmu.max_period = x86_pmu.cntval_mask >> 1;
 547
 548                         /* Clearing status works only if the global control is enable on zxc. */
 549                         x86_pmu.enabled_ack = 1;
 550
 551                         x86_pmu.event_constraints = zxc_event_constraints;
 552                         zx_pmon_event_map[PERF_COUNT_HW_INSTRUCTIONS] = 0;
 553                         zx_pmon_event_map[PERF_COUNT_HW_CACHE_REFERENCES] = 0;
 554                         zx_pmon_event_map[PERF_COUNT_HW_CACHE_MISSES] = 0;
 555                         zx_pmon_event_map[PERF_COUNT_HW_BUS_CYCLES] = 0;
 556
 557                         pr_cont("ZXC events, ");
 558                         break;
 559                 }
 560                 return -ENODEV;
 561
 562         case 0x07:
 563                 zx_pmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
 564                         X86_CONFIG(.event = 0x01, .umask = 0x01, .inv = 0x01, .cmask = 0x01);
 565
 566                 zx_pmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] =
 567                         X86_CONFIG(.event = 0x0f, .umask = 0x04, .inv = 0, .cmask = 0);
 568
 569                 switch (boot_cpu_data.x86_model) {
 570                 case 0x1b:
 571                         memcpy(hw_cache_event_ids, zxd_hw_cache_event_ids,
 572                                sizeof(hw_cache_event_ids));
 573
 574                         x86_pmu.event_constraints = zxd_event_constraints;
 575
 576                         zx_pmon_event_map[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x0700;
 577                         zx_pmon_event_map[PERF_COUNT_HW_BRANCH_MISSES] = 0x0709;
 578
 579                         pr_cont("ZXD events, ");
 580                         break;
 581                 case 0x3b:
 582                         memcpy(hw_cache_event_ids, zxe_hw_cache_event_ids,
 583                                sizeof(hw_cache_event_ids));
 584
 585                         x86_pmu.event_constraints = zxd_event_constraints;
 586
 587                         zx_pmon_event_map[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x0028;
 588                         zx_pmon_event_map[PERF_COUNT_HW_BRANCH_MISSES] = 0x0029;
 589
 590                         pr_cont("ZXE events, ");
 591                         break;
 592                 default:
 593                         return -ENODEV;
 594                 }
 595                 break;
 596
 597         default:
 598                 return -ENODEV;
 599         }
 600
 601         x86_pmu.intel_ctrl = (1 << (x86_pmu.num_counters)) - 1;
 602         x86_pmu.intel_ctrl |= ((1LL << x86_pmu.num_counters_fixed)-1) << INTEL_PMC_IDX_FIXED;
 603
 604         if (x86_pmu.event_constraints) {
 605                 for_each_event_constraint(c, x86_pmu.event_constraints) {
 606                         c->idxmsk64 |= (1ULL << x86_pmu.num_counters) - 1;
 607                         c->weight += x86_pmu.num_counters;
 608                 }
 609         }
 610
 611         return 0;
 612 }
 613