arch/mips/kernel/perf_event_mipsxx.c

   1 /*
   2  * Linux performance counter support for MIPS.
   3  *
   4  * Copyright (C) 2010 MIPS Technologies, Inc.
   5  * Copyright (C) 2011 Cavium Networks, Inc.
   6  * Author: Deng-Cheng Zhu
   7  *
   8  * This code is based on the implementation for ARM, which is in turn
   9  * based on the sparc64 perf event code and the x86 code. Performance
  10  * counter access is based on the MIPS Oprofile code. And the callchain
  11  * support references the code of MIPS stacktrace.c.
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License version 2 as
  15  * published by the Free Software Foundation.
  16  */
  17
  18 #include <linux/cpumask.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/smp.h>
  21 #include <linux/kernel.h>
  22 #include <linux/perf_event.h>
  23 #include <linux/uaccess.h>
  24
  25 #include <asm/irq.h>
  26 #include <asm/irq_regs.h>
  27 #include <asm/stacktrace.h>
  28 #include <asm/time.h> /* For perf_irq */
  29
  30 #define MIPS_MAX_HWEVENTS 4
  31
  32 struct cpu_hw_events {
  33         /* Array of events on this cpu. */
  34         struct perf_event       *events[MIPS_MAX_HWEVENTS];
  35
  36         /*
  37          * Set the bit (indexed by the counter number) when the counter
  38          * is used for an event.
  39          */
  40         unsigned long           used_mask[BITS_TO_LONGS(MIPS_MAX_HWEVENTS)];
  41
  42         /*
  43          * Software copy of the control register for each performance counter.
  44          * MIPS CPUs vary in performance counters. They use this differently,
  45          * and even may not use it.
  46          */
  47         unsigned int            saved_ctrl[MIPS_MAX_HWEVENTS];
  48 };
  49 DEFINE_PER_CPU(struct cpu_hw_events, cpu_hw_events) = {
  50         .saved_ctrl = {0},
  51 };
  52
  53 /* The description of MIPS performance events. */
  54 struct mips_perf_event {
  55         unsigned int event_id;
  56         /*
  57          * MIPS performance counters are indexed starting from 0.
  58          * CNTR_EVEN indicates the indexes of the counters to be used are
  59          * even numbers.
  60          */
  61         unsigned int cntr_mask;
  62         #define CNTR_EVEN       0x55555555
  63         #define CNTR_ODD        0xaaaaaaaa
  64         #define CNTR_ALL        0xffffffff
  65 #ifdef CONFIG_MIPS_MT_SMP
  66         enum {
  67                 T  = 0,
  68                 V  = 1,
  69                 P  = 2,
  70         } range;
  71 #else
  72         #define T
  73         #define V
  74         #define P
  75 #endif
  76 };
  77
  78 static struct mips_perf_event raw_event;
  79 static DEFINE_MUTEX(raw_event_mutex);
  80
  81 #define UNSUPPORTED_PERF_EVENT_ID 0xffffffff
  82 #define C(x) PERF_COUNT_HW_CACHE_##x
  83
  84 struct mips_pmu {
  85         u64             max_period;
  86         u64             valid_count;
  87         u64             overflow;
  88         const char      *name;
  89         int             irq;
  90         u64             (*read_counter)(unsigned int idx);
  91         void            (*write_counter)(unsigned int idx, u64 val);
  92         const struct mips_perf_event *(*map_raw_event)(u64 config);
  93         const struct mips_perf_event (*general_event_map)[PERF_COUNT_HW_MAX];
  94         const struct mips_perf_event (*cache_event_map)
  95                                 [PERF_COUNT_HW_CACHE_MAX]
  96                                 [PERF_COUNT_HW_CACHE_OP_MAX]
  97                                 [PERF_COUNT_HW_CACHE_RESULT_MAX];
  98         unsigned int    num_counters;
  99 };
 100
 101 static struct mips_pmu mipspmu;
 102
 103 #define M_CONFIG1_PC    (1 << 4)
 104
 105 #define M_PERFCTL_EXL                   (1      <<  0)
 106 #define M_PERFCTL_KERNEL                (1      <<  1)
 107 #define M_PERFCTL_SUPERVISOR            (1      <<  2)
 108 #define M_PERFCTL_USER                  (1      <<  3)
 109 #define M_PERFCTL_INTERRUPT_ENABLE      (1      <<  4)
 110 #define M_PERFCTL_EVENT(event)          (((event) & 0x3ff)  << 5)
 111 #define M_PERFCTL_VPEID(vpe)            ((vpe)    << 16)
 112 #define M_PERFCTL_MT_EN(filter)         ((filter) << 20)
 113 #define    M_TC_EN_ALL                  M_PERFCTL_MT_EN(0)
 114 #define    M_TC_EN_VPE                  M_PERFCTL_MT_EN(1)
 115 #define    M_TC_EN_TC                   M_PERFCTL_MT_EN(2)
 116 #define M_PERFCTL_TCID(tcid)            ((tcid)   << 22)
 117 #define M_PERFCTL_WIDE                  (1      << 30)
 118 #define M_PERFCTL_MORE                  (1      << 31)
 119
 120 #define M_PERFCTL_COUNT_EVENT_WHENEVER  (M_PERFCTL_EXL |                \
 121                                         M_PERFCTL_KERNEL |              \
 122                                         M_PERFCTL_USER |                \
 123                                         M_PERFCTL_SUPERVISOR |          \
 124                                         M_PERFCTL_INTERRUPT_ENABLE)
 125
 126 #ifdef CONFIG_MIPS_MT_SMP
 127 #define M_PERFCTL_CONFIG_MASK           0x3fff801f
 128 #else
 129 #define M_PERFCTL_CONFIG_MASK           0x1f
 130 #endif
 131 #define M_PERFCTL_EVENT_MASK            0xfe0
 132
 133
 134 #ifdef CONFIG_MIPS_MT_SMP
 135 static int cpu_has_mipsmt_pertccounters;
 136
 137 static DEFINE_RWLOCK(pmuint_rwlock);
 138
 139 /*
 140  * FIXME: For VSMP, vpe_id() is redefined for Perf-events, because
 141  * cpu_data[cpuid].vpe_id reports 0 for _both_ CPUs.
 142  */
 143 #if defined(CONFIG_HW_PERF_EVENTS)
 144 #define vpe_id()        (cpu_has_mipsmt_pertccounters ? \
 145                         0 : smp_processor_id())
 146 #else
 147 #define vpe_id()        (cpu_has_mipsmt_pertccounters ? \
 148                         0 : cpu_data[smp_processor_id()].vpe_id)
 149 #endif
 150
 151 /* Copied from op_model_mipsxx.c */
 152 static unsigned int vpe_shift(void)
 153 {
 154         if (num_possible_cpus() > 1)
 155                 return 1;
 156
 157         return 0;
 158 }
 159
 160 static unsigned int counters_total_to_per_cpu(unsigned int counters)
 161 {
 162         return counters >> vpe_shift();
 163 }
 164
 165 static unsigned int counters_per_cpu_to_total(unsigned int counters)
 166 {
 167         return counters << vpe_shift();
 168 }
 169
 170 #else /* !CONFIG_MIPS_MT_SMP */
 171 #define vpe_id()        0
 172
 173 #endif /* CONFIG_MIPS_MT_SMP */
 174
 175 static void resume_local_counters(void);
 176 static void pause_local_counters(void);
 177 static irqreturn_t mipsxx_pmu_handle_irq(int, void *);
 178 static int mipsxx_pmu_handle_shared_irq(void);
 179
 180 static unsigned int mipsxx_pmu_swizzle_perf_idx(unsigned int idx)
 181 {
 182         if (vpe_id() == 1)
 183                 idx = (idx + 2) & 3;
 184         return idx;
 185 }
 186
 187 static u64 mipsxx_pmu_read_counter(unsigned int idx)
 188 {
 189         idx = mipsxx_pmu_swizzle_perf_idx(idx);
 190
 191         switch (idx) {
 192         case 0:
 193                 /*
 194                  * The counters are unsigned, we must cast to truncate
 195                  * off the high bits.
 196                  */
 197                 return (u32)read_c0_perfcntr0();
 198         case 1:
 199                 return (u32)read_c0_perfcntr1();
 200         case 2:
 201                 return (u32)read_c0_perfcntr2();
 202         case 3:
 203                 return (u32)read_c0_perfcntr3();
 204         default:
 205                 WARN_ONCE(1, "Invalid performance counter number (%d)\n", idx);
 206                 return 0;
 207         }
 208 }
 209
 210 static u64 mipsxx_pmu_read_counter_64(unsigned int idx)
 211 {
 212         idx = mipsxx_pmu_swizzle_perf_idx(idx);
 213
 214         switch (idx) {
 215         case 0:
 216                 return read_c0_perfcntr0_64();
 217         case 1:
 218                 return read_c0_perfcntr1_64();
 219         case 2:
 220                 return read_c0_perfcntr2_64();
 221         case 3:
 222                 return read_c0_perfcntr3_64();
 223         default:
 224                 WARN_ONCE(1, "Invalid performance counter number (%d)\n", idx);
 225                 return 0;
 226         }
 227 }
 228
 229 static void mipsxx_pmu_write_counter(unsigned int idx, u64 val)
 230 {
 231         idx = mipsxx_pmu_swizzle_perf_idx(idx);
 232
 233         switch (idx) {
 234         case 0:
 235                 write_c0_perfcntr0(val);
 236                 return;
 237         case 1:
 238                 write_c0_perfcntr1(val);
 239                 return;
 240         case 2:
 241                 write_c0_perfcntr2(val);
 242                 return;
 243         case 3:
 244                 write_c0_perfcntr3(val);
 245                 return;
 246         }
 247 }
 248
 249 static void mipsxx_pmu_write_counter_64(unsigned int idx, u64 val)
 250 {
 251         idx = mipsxx_pmu_swizzle_perf_idx(idx);
 252
 253         switch (idx) {
 254         case 0:
 255                 write_c0_perfcntr0_64(val);
 256                 return;
 257         case 1:
 258                 write_c0_perfcntr1_64(val);
 259                 return;
 260         case 2:
 261                 write_c0_perfcntr2_64(val);
 262                 return;
 263         case 3:
 264                 write_c0_perfcntr3_64(val);
 265                 return;
 266         }
 267 }
 268
 269 static unsigned int mipsxx_pmu_read_control(unsigned int idx)
 270 {
 271         idx = mipsxx_pmu_swizzle_perf_idx(idx);
 272
 273         switch (idx) {
 274         case 0:
 275                 return read_c0_perfctrl0();
 276         case 1:
 277                 return read_c0_perfctrl1();
 278         case 2:
 279                 return read_c0_perfctrl2();
 280         case 3:
 281                 return read_c0_perfctrl3();
 282         default:
 283                 WARN_ONCE(1, "Invalid performance counter number (%d)\n", idx);
 284                 return 0;
 285         }
 286 }
 287
 288 static void mipsxx_pmu_write_control(unsigned int idx, unsigned int val)
 289 {
 290         idx = mipsxx_pmu_swizzle_perf_idx(idx);
 291
 292         switch (idx) {
 293         case 0:
 294                 write_c0_perfctrl0(val);
 295                 return;
 296         case 1:
 297                 write_c0_perfctrl1(val);
 298                 return;
 299         case 2:
 300                 write_c0_perfctrl2(val);
 301                 return;
 302         case 3:
 303                 write_c0_perfctrl3(val);
 304                 return;
 305         }
 306 }
 307
 308 static int mipsxx_pmu_alloc_counter(struct cpu_hw_events *cpuc,
 309                                     struct hw_perf_event *hwc)
 310 {
 311         int i;
 312
 313         /*
 314          * We only need to care the counter mask. The range has been
 315          * checked definitely.
 316          */
 317         unsigned long cntr_mask = (hwc->event_base >> 8) & 0xffff;
 318
 319         for (i = mipspmu.num_counters - 1; i >= 0; i--) {
 320                 /*
 321                  * Note that some MIPS perf events can be counted by both
 322                  * even and odd counters, wheresas many other are only by
 323                  * even _or_ odd counters. This introduces an issue that
 324                  * when the former kind of event takes the counter the
 325                  * latter kind of event wants to use, then the "counter
 326                  * allocation" for the latter event will fail. In fact if
 327                  * they can be dynamically swapped, they both feel happy.
 328                  * But here we leave this issue alone for now.
 329                  */
 330                 if (test_bit(i, &cntr_mask) &&
 331                         !test_and_set_bit(i, cpuc->used_mask))
 332                         return i;
 333         }
 334
 335         return -EAGAIN;
 336 }
 337
 338 static void mipsxx_pmu_enable_event(struct hw_perf_event *evt, int idx)
 339 {
 340         struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
 341
 342         WARN_ON(idx < 0 || idx >= mipspmu.num_counters);
 343
 344         cpuc->saved_ctrl[idx] = M_PERFCTL_EVENT(evt->event_base & 0xff) |
 345                 (evt->config_base & M_PERFCTL_CONFIG_MASK) |
 346                 /* Make sure interrupt enabled. */
 347                 M_PERFCTL_INTERRUPT_ENABLE;
 348         /*
 349          * We do not actually let the counter run. Leave it until start().
 350          */
 351 }
 352
 353 static void mipsxx_pmu_disable_event(int idx)
 354 {
 355         struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
 356         unsigned long flags;
 357
 358         WARN_ON(idx < 0 || idx >= mipspmu.num_counters);
 359
 360         local_irq_save(flags);
 361         cpuc->saved_ctrl[idx] = mipsxx_pmu_read_control(idx) &
 362                 ~M_PERFCTL_COUNT_EVENT_WHENEVER;
 363         mipsxx_pmu_write_control(idx, cpuc->saved_ctrl[idx]);
 364         local_irq_restore(flags);
 365 }
 366
 367 static int mipspmu_event_set_period(struct perf_event *event,
 368                                     struct hw_perf_event *hwc,
 369                                     int idx)
 370 {
 371         u64 left = local64_read(&hwc->period_left);
 372         u64 period = hwc->sample_period;
 373         int ret = 0;
 374
 375         if (unlikely((left + period) & (1ULL << 63))) {
 376                 /* left underflowed by more than period. */
 377                 left = period;
 378                 local64_set(&hwc->period_left, left);
 379                 hwc->last_period = period;
 380                 ret = 1;
 381         } else  if (unlikely((left + period) <= period)) {
 382                 /* left underflowed by less than period. */
 383                 left += period;
 384                 local64_set(&hwc->period_left, left);
 385                 hwc->last_period = period;
 386                 ret = 1;
 387         }
 388
 389         if (left > mipspmu.max_period) {
 390                 left = mipspmu.max_period;
 391                 local64_set(&hwc->period_left, left);
 392         }
 393
 394         local64_set(&hwc->prev_count, mipspmu.overflow - left);
 395
 396         mipspmu.write_counter(idx, mipspmu.overflow - left);
 397
 398         perf_event_update_userpage(event);
 399
 400         return ret;
 401 }
 402
 403 static void mipspmu_event_update(struct perf_event *event,
 404                                  struct hw_perf_event *hwc,
 405                                  int idx)
 406 {
 407         u64 prev_raw_count, new_raw_count;
 408         u64 delta;
 409
 410 again:
 411         prev_raw_count = local64_read(&hwc->prev_count);
 412         new_raw_count = mipspmu.read_counter(idx);
 413
 414         if (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
 415                                 new_raw_count) != prev_raw_count)
 416                 goto again;
 417
 418         delta = new_raw_count - prev_raw_count;
 419
 420         local64_add(delta, &event->count);
 421         local64_sub(delta, &hwc->period_left);
 422 }
 423
 424 static void mipspmu_start(struct perf_event *event, int flags)
 425 {
 426         struct hw_perf_event *hwc = &event->hw;
 427
 428         if (flags & PERF_EF_RELOAD)
 429                 WARN_ON_ONCE(!(hwc->state & PERF_HES_UPTODATE));
 430
 431         hwc->state = 0;
 432
 433         /* Set the period for the event. */
 434         mipspmu_event_set_period(event, hwc, hwc->idx);
 435
 436         /* Enable the event. */
 437         mipsxx_pmu_enable_event(hwc, hwc->idx);
 438 }
 439
 440 static void mipspmu_stop(struct perf_event *event, int flags)
 441 {
 442         struct hw_perf_event *hwc = &event->hw;
 443
 444         if (!(hwc->state & PERF_HES_STOPPED)) {
 445                 /* We are working on a local event. */
 446                 mipsxx_pmu_disable_event(hwc->idx);
 447                 barrier();
 448                 mipspmu_event_update(event, hwc, hwc->idx);
 449                 hwc->state |= PERF_HES_STOPPED | PERF_HES_UPTODATE;
 450         }
 451 }
 452
 453 static int mipspmu_add(struct perf_event *event, int flags)
 454 {
 455         struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
 456         struct hw_perf_event *hwc = &event->hw;
 457         int idx;
 458         int err = 0;
 459
 460         perf_pmu_disable(event->pmu);
 461
 462         /* To look for a free counter for this event. */
 463         idx = mipsxx_pmu_alloc_counter(cpuc, hwc);
 464         if (idx < 0) {
 465                 err = idx;
 466                 goto out;
 467         }
 468
 469         /*
 470          * If there is an event in the counter we are going to use then
 471          * make sure it is disabled.
 472          */
 473         event->hw.idx = idx;
 474         mipsxx_pmu_disable_event(idx);
 475         cpuc->events[idx] = event;
 476
 477         hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE;
 478         if (flags & PERF_EF_START)
 479                 mipspmu_start(event, PERF_EF_RELOAD);
 480
 481         /* Propagate our changes to the userspace mapping. */
 482         perf_event_update_userpage(event);
 483
 484 out:
 485         perf_pmu_enable(event->pmu);
 486         return err;
 487 }
 488
 489 static void mipspmu_del(struct perf_event *event, int flags)
 490 {
 491         struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
 492         struct hw_perf_event *hwc = &event->hw;
 493         int idx = hwc->idx;
 494
 495         WARN_ON(idx < 0 || idx >= mipspmu.num_counters);
 496
 497         mipspmu_stop(event, PERF_EF_UPDATE);
 498         cpuc->events[idx] = NULL;
 499         clear_bit(idx, cpuc->used_mask);
 500
 501         perf_event_update_userpage(event);
 502 }
 503
 504 static void mipspmu_read(struct perf_event *event)
 505 {
 506         struct hw_perf_event *hwc = &event->hw;
 507
 508         /* Don't read disabled counters! */
 509         if (hwc->idx < 0)
 510                 return;
 511
 512         mipspmu_event_update(event, hwc, hwc->idx);
 513 }
 514
 515 static void mipspmu_enable(struct pmu *pmu)
 516 {
 517 #ifdef CONFIG_MIPS_MT_SMP
 518         write_unlock(&pmuint_rwlock);
 519 #endif
 520         resume_local_counters();
 521 }
 522
 523 /*
 524  * MIPS performance counters can be per-TC. The control registers can
 525  * not be directly accessed accross CPUs. Hence if we want to do global
 526  * control, we need cross CPU calls. on_each_cpu() can help us, but we
 527  * can not make sure this function is called with interrupts enabled. So
 528  * here we pause local counters and then grab a rwlock and leave the
 529  * counters on other CPUs alone. If any counter interrupt raises while
 530  * we own the write lock, simply pause local counters on that CPU and
 531  * spin in the handler. Also we know we won't be switched to another
 532  * CPU after pausing local counters and before grabbing the lock.
 533  */
 534 static void mipspmu_disable(struct pmu *pmu)
 535 {
 536         pause_local_counters();
 537 #ifdef CONFIG_MIPS_MT_SMP
 538         write_lock(&pmuint_rwlock);
 539 #endif
 540 }
 541
 542 static atomic_t active_events = ATOMIC_INIT(0);
 543 static DEFINE_MUTEX(pmu_reserve_mutex);
 544 static int (*save_perf_irq)(void);
 545
 546 static int mipspmu_get_irq(void)
 547 {
 548         int err;
 549
 550         if (mipspmu.irq >= 0) {
 551                 /* Request my own irq handler. */
 552                 err = request_irq(mipspmu.irq, mipsxx_pmu_handle_irq,
 553                         IRQF_PERCPU | IRQF_NOBALANCING,
 554                         "mips_perf_pmu", NULL);
 555                 if (err) {
 556                         pr_warning("Unable to request IRQ%d for MIPS "
 557                            "performance counters!\n", mipspmu.irq);
 558                 }
 559         } else if (cp0_perfcount_irq < 0) {
 560                 /*
 561                  * We are sharing the irq number with the timer interrupt.
 562                  */
 563                 save_perf_irq = perf_irq;
 564                 perf_irq = mipsxx_pmu_handle_shared_irq;
 565                 err = 0;
 566         } else {
 567                 pr_warning("The platform hasn't properly defined its "
 568                         "interrupt controller.\n");
 569                 err = -ENOENT;
 570         }
 571
 572         return err;
 573 }
 574
 575 static void mipspmu_free_irq(void)
 576 {
 577         if (mipspmu.irq >= 0)
 578                 free_irq(mipspmu.irq, NULL);
 579         else if (cp0_perfcount_irq < 0)
 580                 perf_irq = save_perf_irq;
 581 }
 582
 583 /*
 584  * mipsxx/rm9000/loongson2 have different performance counters, they have
 585  * specific low-level init routines.
 586  */
 587 static void reset_counters(void *arg);
 588 static int __hw_perf_event_init(struct perf_event *event);
 589
 590 static void hw_perf_event_destroy(struct perf_event *event)
 591 {
 592         if (atomic_dec_and_mutex_lock(&active_events,
 593                                 &pmu_reserve_mutex)) {
 594                 /*
 595                  * We must not call the destroy function with interrupts
 596                  * disabled.
 597                  */
 598                 on_each_cpu(reset_counters,
 599                         (void *)(long)mipspmu.num_counters, 1);
 600                 mipspmu_free_irq();
 601                 mutex_unlock(&pmu_reserve_mutex);
 602         }
 603 }
 604
 605 static int mipspmu_event_init(struct perf_event *event)
 606 {
 607         int err = 0;
 608
 609         switch (event->attr.type) {
 610         case PERF_TYPE_RAW:
 611         case PERF_TYPE_HARDWARE:
 612         case PERF_TYPE_HW_CACHE:
 613                 break;
 614
 615         default:
 616                 return -ENOENT;
 617         }
 618
 619         if (event->cpu >= nr_cpumask_bits ||
 620             (event->cpu >= 0 && !cpu_online(event->cpu)))
 621                 return -ENODEV;
 622
 623         if (!atomic_inc_not_zero(&active_events)) {
 624                 if (atomic_read(&active_events) > MIPS_MAX_HWEVENTS) {
 625                         atomic_dec(&active_events);
 626                         return -ENOSPC;
 627                 }
 628
 629                 mutex_lock(&pmu_reserve_mutex);
 630                 if (atomic_read(&active_events) == 0)
 631                         err = mipspmu_get_irq();
 632
 633                 if (!err)
 634                         atomic_inc(&active_events);
 635                 mutex_unlock(&pmu_reserve_mutex);
 636         }
 637
 638         if (err)
 639                 return err;
 640
 641         err = __hw_perf_event_init(event);
 642         if (err)
 643                 hw_perf_event_destroy(event);
 644
 645         return err;
 646 }
 647
 648 static struct pmu pmu = {
 649         .pmu_enable     = mipspmu_enable,
 650         .pmu_disable    = mipspmu_disable,
 651         .event_init     = mipspmu_event_init,
 652         .add            = mipspmu_add,
 653         .del            = mipspmu_del,
 654         .start          = mipspmu_start,
 655         .stop           = mipspmu_stop,
 656         .read           = mipspmu_read,
 657 };
 658
 659 static unsigned int mipspmu_perf_event_encode(const struct mips_perf_event *pev)
 660 {
 661 /*
 662  * Top 8 bits for range, next 16 bits for cntr_mask, lowest 8 bits for
 663  * event_id.
 664  */
 665 #ifdef CONFIG_MIPS_MT_SMP
 666         return ((unsigned int)pev->range << 24) |
 667                 (pev->cntr_mask & 0xffff00) |
 668                 (pev->event_id & 0xff);
 669 #else
 670         return (pev->cntr_mask & 0xffff00) |
 671                 (pev->event_id & 0xff);
 672 #endif
 673 }
 674
 675 static const struct mips_perf_event *mipspmu_map_general_event(int idx)
 676 {
 677         const struct mips_perf_event *pev;
 678
 679         pev = ((*mipspmu.general_event_map)[idx].event_id ==
 680                 UNSUPPORTED_PERF_EVENT_ID ? ERR_PTR(-EOPNOTSUPP) :
 681                 &(*mipspmu.general_event_map)[idx]);
 682
 683         return pev;
 684 }
 685
 686 static const struct mips_perf_event *mipspmu_map_cache_event(u64 config)
 687 {
 688         unsigned int cache_type, cache_op, cache_result;
 689         const struct mips_perf_event *pev;
 690
 691         cache_type = (config >> 0) & 0xff;
 692         if (cache_type >= PERF_COUNT_HW_CACHE_MAX)
 693                 return ERR_PTR(-EINVAL);
 694
 695         cache_op = (config >> 8) & 0xff;
 696         if (cache_op >= PERF_COUNT_HW_CACHE_OP_MAX)
 697                 return ERR_PTR(-EINVAL);
 698
 699         cache_result = (config >> 16) & 0xff;
 700         if (cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
 701                 return ERR_PTR(-EINVAL);
 702
 703         pev = &((*mipspmu.cache_event_map)
 704                                         [cache_type]
 705                                         [cache_op]
 706                                         [cache_result]);
 707
 708         if (pev->event_id == UNSUPPORTED_PERF_EVENT_ID)
 709                 return ERR_PTR(-EOPNOTSUPP);
 710
 711         return pev;
 712
 713 }
 714
 715 static int validate_event(struct cpu_hw_events *cpuc,
 716                struct perf_event *event)
 717 {
 718         struct hw_perf_event fake_hwc = event->hw;
 719
 720         /* Allow mixed event group. So return 1 to pass validation. */
 721         if (event->pmu != &pmu || event->state <= PERF_EVENT_STATE_OFF)
 722                 return 1;
 723
 724         return mipsxx_pmu_alloc_counter(cpuc, &fake_hwc) >= 0;
 725 }
 726
 727 static int validate_group(struct perf_event *event)
 728 {
 729         struct perf_event *sibling, *leader = event->group_leader;
 730         struct cpu_hw_events fake_cpuc;
 731
 732         memset(&fake_cpuc, 0, sizeof(fake_cpuc));
 733
 734         if (!validate_event(&fake_cpuc, leader))
 735                 return -ENOSPC;
 736
 737         list_for_each_entry(sibling, &leader->sibling_list, group_entry) {
 738                 if (!validate_event(&fake_cpuc, sibling))
 739                         return -ENOSPC;
 740         }
 741
 742         if (!validate_event(&fake_cpuc, event))
 743                 return -ENOSPC;
 744
 745         return 0;
 746 }
 747
 748 /* This is needed by specific irq handlers in perf_event_*.c */
 749 static void handle_associated_event(struct cpu_hw_events *cpuc,
 750                                     int idx, struct perf_sample_data *data,
 751                                     struct pt_regs *regs)
 752 {
 753         struct perf_event *event = cpuc->events[idx];
 754         struct hw_perf_event *hwc = &event->hw;
 755
 756         mipspmu_event_update(event, hwc, idx);
 757         data->period = event->hw.last_period;
 758         if (!mipspmu_event_set_period(event, hwc, idx))
 759                 return;
 760
 761         if (perf_event_overflow(event, data, regs))
 762                 mipsxx_pmu_disable_event(idx);
 763 }
 764
 765
 766 static int __n_counters(void)
 767 {
 768         if (!(read_c0_config1() & M_CONFIG1_PC))
 769                 return 0;
 770         if (!(read_c0_perfctrl0() & M_PERFCTL_MORE))
 771                 return 1;
 772         if (!(read_c0_perfctrl1() & M_PERFCTL_MORE))
 773                 return 2;
 774         if (!(read_c0_perfctrl2() & M_PERFCTL_MORE))
 775                 return 3;
 776
 777         return 4;
 778 }
 779
 780 static int n_counters(void)
 781 {
 782         int counters;
 783
 784         switch (current_cpu_type()) {
 785         case CPU_R10000:
 786                 counters = 2;
 787                 break;
 788
 789         case CPU_R12000:
 790         case CPU_R14000:
 791                 counters = 4;
 792                 break;
 793
 794         default:
 795                 counters = __n_counters();
 796         }
 797
 798         return counters;
 799 }
 800
 801 static void reset_counters(void *arg)
 802 {
 803         int counters = (int)(long)arg;
 804         switch (counters) {
 805         case 4:
 806                 mipsxx_pmu_write_control(3, 0);
 807                 mipspmu.write_counter(3, 0);
 808         case 3:
 809                 mipsxx_pmu_write_control(2, 0);
 810                 mipspmu.write_counter(2, 0);
 811         case 2:
 812                 mipsxx_pmu_write_control(1, 0);
 813                 mipspmu.write_counter(1, 0);
 814         case 1:
 815                 mipsxx_pmu_write_control(0, 0);
 816                 mipspmu.write_counter(0, 0);
 817         }
 818 }
 819
 820 /* 24K/34K/1004K cores can share the same event map. */
 821 static const struct mips_perf_event mipsxxcore_event_map
 822                                 [PERF_COUNT_HW_MAX] = {
 823         [PERF_COUNT_HW_CPU_CYCLES] = { 0x00, CNTR_EVEN | CNTR_ODD, P },
 824         [PERF_COUNT_HW_INSTRUCTIONS] = { 0x01, CNTR_EVEN | CNTR_ODD, T },
 825         [PERF_COUNT_HW_CACHE_REFERENCES] = { UNSUPPORTED_PERF_EVENT_ID },
 826         [PERF_COUNT_HW_CACHE_MISSES] = { UNSUPPORTED_PERF_EVENT_ID },
 827         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = { 0x02, CNTR_EVEN, T },
 828         [PERF_COUNT_HW_BRANCH_MISSES] = { 0x02, CNTR_ODD, T },
 829         [PERF_COUNT_HW_BUS_CYCLES] = { UNSUPPORTED_PERF_EVENT_ID },
 830 };
 831
 832 /* 74K core has different branch event code. */
 833 static const struct mips_perf_event mipsxx74Kcore_event_map
 834                                 [PERF_COUNT_HW_MAX] = {
 835         [PERF_COUNT_HW_CPU_CYCLES] = { 0x00, CNTR_EVEN | CNTR_ODD, P },
 836         [PERF_COUNT_HW_INSTRUCTIONS] = { 0x01, CNTR_EVEN | CNTR_ODD, T },
 837         [PERF_COUNT_HW_CACHE_REFERENCES] = { UNSUPPORTED_PERF_EVENT_ID },
 838         [PERF_COUNT_HW_CACHE_MISSES] = { UNSUPPORTED_PERF_EVENT_ID },
 839         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = { 0x27, CNTR_EVEN, T },
 840         [PERF_COUNT_HW_BRANCH_MISSES] = { 0x27, CNTR_ODD, T },
 841         [PERF_COUNT_HW_BUS_CYCLES] = { UNSUPPORTED_PERF_EVENT_ID },
 842 };
 843
 844 static const struct mips_perf_event octeon_event_map[PERF_COUNT_HW_MAX] = {
 845         [PERF_COUNT_HW_CPU_CYCLES] = { 0x01, CNTR_ALL },
 846         [PERF_COUNT_HW_INSTRUCTIONS] = { 0x03, CNTR_ALL },
 847         [PERF_COUNT_HW_CACHE_REFERENCES] = { 0x2b, CNTR_ALL },
 848         [PERF_COUNT_HW_CACHE_MISSES] = { 0x2e, CNTR_ALL  },
 849         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = { 0x08, CNTR_ALL },
 850         [PERF_COUNT_HW_BRANCH_MISSES] = { 0x09, CNTR_ALL },
 851         [PERF_COUNT_HW_BUS_CYCLES] = { 0x25, CNTR_ALL },
 852 };
 853
 854 /* 24K/34K/1004K cores can share the same cache event map. */
 855 static const struct mips_perf_event mipsxxcore_cache_map
 856                                 [PERF_COUNT_HW_CACHE_MAX]
 857                                 [PERF_COUNT_HW_CACHE_OP_MAX]
 858                                 [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
 859 [C(L1D)] = {
 860         /*
 861          * Like some other architectures (e.g. ARM), the performance
 862          * counters don't differentiate between read and write
 863          * accesses/misses, so this isn't strictly correct, but it's the
 864          * best we can do. Writes and reads get combined.
 865          */
 866         [C(OP_READ)] = {
 867                 [C(RESULT_ACCESS)]      = { 0x0a, CNTR_EVEN, T },
 868                 [C(RESULT_MISS)]        = { 0x0b, CNTR_EVEN | CNTR_ODD, T },
 869         },
 870         [C(OP_WRITE)] = {
 871                 [C(RESULT_ACCESS)]      = { 0x0a, CNTR_EVEN, T },
 872                 [C(RESULT_MISS)]        = { 0x0b, CNTR_EVEN | CNTR_ODD, T },
 873         },
 874         [C(OP_PREFETCH)] = {
 875                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
 876                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
 877         },
 878 },
 879 [C(L1I)] = {
 880         [C(OP_READ)] = {
 881                 [C(RESULT_ACCESS)]      = { 0x09, CNTR_EVEN, T },
 882                 [C(RESULT_MISS)]        = { 0x09, CNTR_ODD, T },
 883         },
 884         [C(OP_WRITE)] = {
 885                 [C(RESULT_ACCESS)]      = { 0x09, CNTR_EVEN, T },
 886                 [C(RESULT_MISS)]        = { 0x09, CNTR_ODD, T },
 887         },
 888         [C(OP_PREFETCH)] = {
 889                 [C(RESULT_ACCESS)]      = { 0x14, CNTR_EVEN, T },
 890                 /*
 891                  * Note that MIPS has only "hit" events countable for
 892                  * the prefetch operation.
 893                  */
 894                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
 895         },
 896 },
 897 [C(LL)] = {
 898         [C(OP_READ)] = {
 899                 [C(RESULT_ACCESS)]      = { 0x15, CNTR_ODD, P },
 900                 [C(RESULT_MISS)]        = { 0x16, CNTR_EVEN, P },
 901         },
 902         [C(OP_WRITE)] = {
 903                 [C(RESULT_ACCESS)]      = { 0x15, CNTR_ODD, P },
 904                 [C(RESULT_MISS)]        = { 0x16, CNTR_EVEN, P },
 905         },
 906         [C(OP_PREFETCH)] = {
 907                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
 908                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
 909         },
 910 },
 911 [C(DTLB)] = {
 912         [C(OP_READ)] = {
 913                 [C(RESULT_ACCESS)]      = { 0x06, CNTR_EVEN, T },
 914                 [C(RESULT_MISS)]        = { 0x06, CNTR_ODD, T },
 915         },
 916         [C(OP_WRITE)] = {
 917                 [C(RESULT_ACCESS)]      = { 0x06, CNTR_EVEN, T },
 918                 [C(RESULT_MISS)]        = { 0x06, CNTR_ODD, T },
 919         },
 920         [C(OP_PREFETCH)] = {
 921                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
 922                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
 923         },
 924 },
 925 [C(ITLB)] = {
 926         [C(OP_READ)] = {
 927                 [C(RESULT_ACCESS)]      = { 0x05, CNTR_EVEN, T },
 928                 [C(RESULT_MISS)]        = { 0x05, CNTR_ODD, T },
 929         },
 930         [C(OP_WRITE)] = {
 931                 [C(RESULT_ACCESS)]      = { 0x05, CNTR_EVEN, T },
 932                 [C(RESULT_MISS)]        = { 0x05, CNTR_ODD, T },
 933         },
 934         [C(OP_PREFETCH)] = {
 935                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
 936                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
 937         },
 938 },
 939 [C(BPU)] = {
 940         /* Using the same code for *HW_BRANCH* */
 941         [C(OP_READ)] = {
 942                 [C(RESULT_ACCESS)]      = { 0x02, CNTR_EVEN, T },
 943                 [C(RESULT_MISS)]        = { 0x02, CNTR_ODD, T },
 944         },
 945         [C(OP_WRITE)] = {
 946                 [C(RESULT_ACCESS)]      = { 0x02, CNTR_EVEN, T },
 947                 [C(RESULT_MISS)]        = { 0x02, CNTR_ODD, T },
 948         },
 949         [C(OP_PREFETCH)] = {
 950                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
 951                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
 952         },
 953 },
 954 [C(NODE)] = {
 955         [C(OP_READ)] = {
 956                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
 957                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
 958         },
 959         [C(OP_WRITE)] = {
 960                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
 961                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
 962         },
 963         [C(OP_PREFETCH)] = {
 964                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
 965                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
 966         },
 967 },
 968 };
 969
 970 /* 74K core has completely different cache event map. */
 971 static const struct mips_perf_event mipsxx74Kcore_cache_map
 972                                 [PERF_COUNT_HW_CACHE_MAX]
 973                                 [PERF_COUNT_HW_CACHE_OP_MAX]
 974                                 [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
 975 [C(L1D)] = {
 976         /*
 977          * Like some other architectures (e.g. ARM), the performance
 978          * counters don't differentiate between read and write
 979          * accesses/misses, so this isn't strictly correct, but it's the
 980          * best we can do. Writes and reads get combined.
 981          */
 982         [C(OP_READ)] = {
 983                 [C(RESULT_ACCESS)]      = { 0x17, CNTR_ODD, T },
 984                 [C(RESULT_MISS)]        = { 0x18, CNTR_ODD, T },
 985         },
 986         [C(OP_WRITE)] = {
 987                 [C(RESULT_ACCESS)]      = { 0x17, CNTR_ODD, T },
 988                 [C(RESULT_MISS)]        = { 0x18, CNTR_ODD, T },
 989         },
 990         [C(OP_PREFETCH)] = {
 991                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
 992                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
 993         },
 994 },
 995 [C(L1I)] = {
 996         [C(OP_READ)] = {
 997                 [C(RESULT_ACCESS)]      = { 0x06, CNTR_EVEN, T },
 998                 [C(RESULT_MISS)]        = { 0x06, CNTR_ODD, T },
 999         },
1000         [C(OP_WRITE)] = {
1001                 [C(RESULT_ACCESS)]      = { 0x06, CNTR_EVEN, T },
1002                 [C(RESULT_MISS)]        = { 0x06, CNTR_ODD, T },
1003         },
1004         [C(OP_PREFETCH)] = {
1005                 [C(RESULT_ACCESS)]      = { 0x34, CNTR_EVEN, T },
1006                 /*
1007                  * Note that MIPS has only "hit" events countable for
1008                  * the prefetch operation.
1009                  */
1010                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1011         },
1012 },
1013 [C(LL)] = {
1014         [C(OP_READ)] = {
1015                 [C(RESULT_ACCESS)]      = { 0x1c, CNTR_ODD, P },
1016                 [C(RESULT_MISS)]        = { 0x1d, CNTR_EVEN | CNTR_ODD, P },
1017         },
1018         [C(OP_WRITE)] = {
1019                 [C(RESULT_ACCESS)]      = { 0x1c, CNTR_ODD, P },
1020                 [C(RESULT_MISS)]        = { 0x1d, CNTR_EVEN | CNTR_ODD, P },
1021         },
1022         [C(OP_PREFETCH)] = {
1023                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1024                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1025         },
1026 },
1027 [C(DTLB)] = {
1028         /* 74K core does not have specific DTLB events. */
1029         [C(OP_READ)] = {
1030                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1031                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1032         },
1033         [C(OP_WRITE)] = {
1034                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1035                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1036         },
1037         [C(OP_PREFETCH)] = {
1038                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1039                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1040         },
1041 },
1042 [C(ITLB)] = {
1043         [C(OP_READ)] = {
1044                 [C(RESULT_ACCESS)]      = { 0x04, CNTR_EVEN, T },
1045                 [C(RESULT_MISS)]        = { 0x04, CNTR_ODD, T },
1046         },
1047         [C(OP_WRITE)] = {
1048                 [C(RESULT_ACCESS)]      = { 0x04, CNTR_EVEN, T },
1049                 [C(RESULT_MISS)]        = { 0x04, CNTR_ODD, T },
1050         },
1051         [C(OP_PREFETCH)] = {
1052                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1053                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1054         },
1055 },
1056 [C(BPU)] = {
1057         /* Using the same code for *HW_BRANCH* */
1058         [C(OP_READ)] = {
1059                 [C(RESULT_ACCESS)]      = { 0x27, CNTR_EVEN, T },
1060                 [C(RESULT_MISS)]        = { 0x27, CNTR_ODD, T },
1061         },
1062         [C(OP_WRITE)] = {
1063                 [C(RESULT_ACCESS)]      = { 0x27, CNTR_EVEN, T },
1064                 [C(RESULT_MISS)]        = { 0x27, CNTR_ODD, T },
1065         },
1066         [C(OP_PREFETCH)] = {
1067                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1068                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1069         },
1070 },
1071 [C(NODE)] = {
1072         [C(OP_READ)] = {
1073                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1074                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1075         },
1076         [C(OP_WRITE)] = {
1077                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1078                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1079         },
1080         [C(OP_PREFETCH)] = {
1081                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1082                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1083         },
1084 },
1085 };
1086
1087
1088 static const struct mips_perf_event octeon_cache_map
1089                                 [PERF_COUNT_HW_CACHE_MAX]
1090                                 [PERF_COUNT_HW_CACHE_OP_MAX]
1091                                 [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
1092 [C(L1D)] = {
1093         [C(OP_READ)] = {
1094                 [C(RESULT_ACCESS)]      = { 0x2b, CNTR_ALL },
1095                 [C(RESULT_MISS)]        = { 0x2e, CNTR_ALL },
1096         },
1097         [C(OP_WRITE)] = {
1098                 [C(RESULT_ACCESS)]      = { 0x30, CNTR_ALL },
1099                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1100         },
1101         [C(OP_PREFETCH)] = {
1102                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1103                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1104         },
1105 },
1106 [C(L1I)] = {
1107         [C(OP_READ)] = {
1108                 [C(RESULT_ACCESS)]      = { 0x18, CNTR_ALL },
1109                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1110         },
1111         [C(OP_WRITE)] = {
1112                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1113                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1114         },
1115         [C(OP_PREFETCH)] = {
1116                 [C(RESULT_ACCESS)]      = { 0x19, CNTR_ALL },
1117                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1118         },
1119 },
1120 [C(LL)] = {
1121         [C(OP_READ)] = {
1122                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1123                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1124         },
1125         [C(OP_WRITE)] = {
1126                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1127                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1128         },
1129         [C(OP_PREFETCH)] = {
1130                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1131                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1132         },
1133 },
1134 [C(DTLB)] = {
1135         /*
1136          * Only general DTLB misses are counted use the same event for
1137          * read and write.
1138          */
1139         [C(OP_READ)] = {
1140                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1141                 [C(RESULT_MISS)]        = { 0x35, CNTR_ALL },
1142         },
1143         [C(OP_WRITE)] = {
1144                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1145                 [C(RESULT_MISS)]        = { 0x35, CNTR_ALL },
1146         },
1147         [C(OP_PREFETCH)] = {
1148                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1149                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1150         },
1151 },
1152 [C(ITLB)] = {
1153         [C(OP_READ)] = {
1154                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1155                 [C(RESULT_MISS)]        = { 0x37, CNTR_ALL },
1156         },
1157         [C(OP_WRITE)] = {
1158                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1159                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1160         },
1161         [C(OP_PREFETCH)] = {
1162                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1163                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1164         },
1165 },
1166 [C(BPU)] = {
1167         /* Using the same code for *HW_BRANCH* */
1168         [C(OP_READ)] = {
1169                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1170                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1171         },
1172         [C(OP_WRITE)] = {
1173                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1174                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1175         },
1176         [C(OP_PREFETCH)] = {
1177                 [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
1178                 [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
1179         },
1180 },
1181 };
1182
1183 #ifdef CONFIG_MIPS_MT_SMP
1184 static void check_and_calc_range(struct perf_event *event,
1185                                  const struct mips_perf_event *pev)
1186 {
1187         struct hw_perf_event *hwc = &event->hw;
1188
1189         if (event->cpu >= 0) {
1190                 if (pev->range > V) {
1191                         /*
1192                          * The user selected an event that is processor
1193                          * wide, while expecting it to be VPE wide.
1194                          */
1195                         hwc->config_base |= M_TC_EN_ALL;
1196                 } else {
1197                         /*
1198                          * FIXME: cpu_data[event->cpu].vpe_id reports 0
1199                          * for both CPUs.
1200                          */
1201                         hwc->config_base |= M_PERFCTL_VPEID(event->cpu);
1202                         hwc->config_base |= M_TC_EN_VPE;
1203                 }
1204         } else
1205                 hwc->config_base |= M_TC_EN_ALL;
1206 }
1207 #else
1208 static void check_and_calc_range(struct perf_event *event,
1209                                  const struct mips_perf_event *pev)
1210 {
1211 }
1212 #endif
1213
1214 static int __hw_perf_event_init(struct perf_event *event)
1215 {
1216         struct perf_event_attr *attr = &event->attr;
1217         struct hw_perf_event *hwc = &event->hw;
1218         const struct mips_perf_event *pev;
1219         int err;
1220
1221         /* Returning MIPS event descriptor for generic perf event. */
1222         if (PERF_TYPE_HARDWARE == event->attr.type) {
1223                 if (event->attr.config >= PERF_COUNT_HW_MAX)
1224                         return -EINVAL;
1225                 pev = mipspmu_map_general_event(event->attr.config);
1226         } else if (PERF_TYPE_HW_CACHE == event->attr.type) {
1227                 pev = mipspmu_map_cache_event(event->attr.config);
1228         } else if (PERF_TYPE_RAW == event->attr.type) {
1229                 /* We are working on the global raw event. */
1230                 mutex_lock(&raw_event_mutex);
1231                 pev = mipspmu.map_raw_event(event->attr.config);
1232         } else {
1233                 /* The event type is not (yet) supported. */
1234                 return -EOPNOTSUPP;
1235         }
1236
1237         if (IS_ERR(pev)) {
1238                 if (PERF_TYPE_RAW == event->attr.type)
1239                         mutex_unlock(&raw_event_mutex);
1240                 return PTR_ERR(pev);
1241         }
1242
1243         /*
1244          * We allow max flexibility on how each individual counter shared
1245          * by the single CPU operates (the mode exclusion and the range).
1246          */
1247         hwc->config_base = M_PERFCTL_INTERRUPT_ENABLE;
1248
1249         /* Calculate range bits and validate it. */
1250         if (num_possible_cpus() > 1)
1251                 check_and_calc_range(event, pev);
1252
1253         hwc->event_base = mipspmu_perf_event_encode(pev);
1254         if (PERF_TYPE_RAW == event->attr.type)
1255                 mutex_unlock(&raw_event_mutex);
1256
1257         if (!attr->exclude_user)
1258                 hwc->config_base |= M_PERFCTL_USER;
1259         if (!attr->exclude_kernel) {
1260                 hwc->config_base |= M_PERFCTL_KERNEL;
1261                 /* MIPS kernel mode: KSU == 00b || EXL == 1 || ERL == 1 */
1262                 hwc->config_base |= M_PERFCTL_EXL;
1263         }
1264         if (!attr->exclude_hv)
1265                 hwc->config_base |= M_PERFCTL_SUPERVISOR;
1266
1267         hwc->config_base &= M_PERFCTL_CONFIG_MASK;
1268         /*
1269          * The event can belong to another cpu. We do not assign a local
1270          * counter for it for now.
1271          */
1272         hwc->idx = -1;
1273         hwc->config = 0;
1274
1275         if (!hwc->sample_period) {
1276                 hwc->sample_period  = mipspmu.max_period;
1277                 hwc->last_period    = hwc->sample_period;
1278                 local64_set(&hwc->period_left, hwc->sample_period);
1279         }
1280
1281         err = 0;
1282         if (event->group_leader != event) {
1283                 err = validate_group(event);
1284                 if (err)
1285                         return -EINVAL;
1286         }
1287
1288         event->destroy = hw_perf_event_destroy;
1289         return err;
1290 }
1291
1292 static void pause_local_counters(void)
1293 {
1294         struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
1295         int ctr = mipspmu.num_counters;
1296         unsigned long flags;
1297
1298         local_irq_save(flags);
1299         do {
1300                 ctr--;
1301                 cpuc->saved_ctrl[ctr] = mipsxx_pmu_read_control(ctr);
1302                 mipsxx_pmu_write_control(ctr, cpuc->saved_ctrl[ctr] &
1303                                          ~M_PERFCTL_COUNT_EVENT_WHENEVER);
1304         } while (ctr > 0);
1305         local_irq_restore(flags);
1306 }
1307
1308 static void resume_local_counters(void)
1309 {
1310         struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
1311         int ctr = mipspmu.num_counters;
1312
1313         do {
1314                 ctr--;
1315                 mipsxx_pmu_write_control(ctr, cpuc->saved_ctrl[ctr]);
1316         } while (ctr > 0);
1317 }
1318
1319 static int mipsxx_pmu_handle_shared_irq(void)
1320 {
1321         struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
1322         struct perf_sample_data data;
1323         unsigned int counters = mipspmu.num_counters;
1324         u64 counter;
1325         int handled = IRQ_NONE;
1326         struct pt_regs *regs;
1327
1328         if (cpu_has_mips_r2 && !(read_c0_cause() & (1 << 26)))
1329                 return handled;
1330         /*
1331          * First we pause the local counters, so that when we are locked
1332          * here, the counters are all paused. When it gets locked due to
1333          * perf_disable(), the timer interrupt handler will be delayed.
1334          *
1335          * See also mipsxx_pmu_start().
1336          */
1337         pause_local_counters();
1338 #ifdef CONFIG_MIPS_MT_SMP
1339         read_lock(&pmuint_rwlock);
1340 #endif
1341
1342         regs = get_irq_regs();
1343
1344         perf_sample_data_init(&data, 0);
1345
1346         switch (counters) {
1347 #define HANDLE_COUNTER(n)                                               \
1348         case n + 1:                                                     \
1349                 if (test_bit(n, cpuc->used_mask)) {                     \
1350                         counter = mipspmu.read_counter(n);              \
1351                         if (counter & mipspmu.overflow) {               \
1352                                 handle_associated_event(cpuc, n, &data, regs); \
1353                                 handled = IRQ_HANDLED;                  \
1354                         }                                               \
1355                 }
1356         HANDLE_COUNTER(3)
1357         HANDLE_COUNTER(2)
1358         HANDLE_COUNTER(1)
1359         HANDLE_COUNTER(0)
1360         }
1361
1362         /*
1363          * Do all the work for the pending perf events. We can do this
1364          * in here because the performance counter interrupt is a regular
1365          * interrupt, not NMI.
1366          */
1367         if (handled == IRQ_HANDLED)
1368                 irq_work_run();
1369
1370 #ifdef CONFIG_MIPS_MT_SMP
1371         read_unlock(&pmuint_rwlock);
1372 #endif
1373         resume_local_counters();
1374         return handled;
1375 }
1376
1377 static irqreturn_t mipsxx_pmu_handle_irq(int irq, void *dev)
1378 {
1379         return mipsxx_pmu_handle_shared_irq();
1380 }
1381
1382 /* 24K */
1383 #define IS_UNSUPPORTED_24K_EVENT(r, b)                                  \
1384         ((b) == 12 || (r) == 151 || (r) == 152 || (b) == 26 ||          \
1385          (b) == 27 || (r) == 28 || (r) == 158 || (b) == 31 ||           \
1386          (b) == 32 || (b) == 34 || (b) == 36 || (r) == 168 ||           \
1387          (r) == 172 || (b) == 47 || ((b) >= 56 && (b) <= 63) ||         \
1388          ((b) >= 68 && (b) <= 127))
1389 #define IS_BOTH_COUNTERS_24K_EVENT(b)                                   \
1390         ((b) == 0 || (b) == 1 || (b) == 11)
1391
1392 /* 34K */
1393 #define IS_UNSUPPORTED_34K_EVENT(r, b)                                  \
1394         ((b) == 12 || (r) == 27 || (r) == 158 || (b) == 36 ||           \
1395          (b) == 38 || (r) == 175 || ((b) >= 56 && (b) <= 63) ||         \
1396          ((b) >= 68 && (b) <= 127))
1397 #define IS_BOTH_COUNTERS_34K_EVENT(b)                                   \
1398         ((b) == 0 || (b) == 1 || (b) == 11)
1399 #ifdef CONFIG_MIPS_MT_SMP
1400 #define IS_RANGE_P_34K_EVENT(r, b)                                      \
1401         ((b) == 0 || (r) == 18 || (b) == 21 || (b) == 22 ||             \
1402          (b) == 25 || (b) == 39 || (r) == 44 || (r) == 174 ||           \
1403          (r) == 176 || ((b) >= 50 && (b) <= 55) ||                      \
1404          ((b) >= 64 && (b) <= 67))
1405 #define IS_RANGE_V_34K_EVENT(r) ((r) == 47)
1406 #endif
1407
1408 /* 74K */
1409 #define IS_UNSUPPORTED_74K_EVENT(r, b)                                  \
1410         ((r) == 5 || ((r) >= 135 && (r) <= 137) ||                      \
1411          ((b) >= 10 && (b) <= 12) || (b) == 22 || (b) == 27 ||          \
1412          (b) == 33 || (b) == 34 || ((b) >= 47 && (b) <= 49) ||          \
1413          (r) == 178 || (b) == 55 || (b) == 57 || (b) == 60 ||           \
1414          (b) == 61 || (r) == 62 || (r) == 191 ||                        \
1415          ((b) >= 64 && (b) <= 127))
1416 #define IS_BOTH_COUNTERS_74K_EVENT(b)                                   \
1417         ((b) == 0 || (b) == 1)
1418
1419 /* 1004K */
1420 #define IS_UNSUPPORTED_1004K_EVENT(r, b)                                \
1421         ((b) == 12 || (r) == 27 || (r) == 158 || (b) == 38 ||           \
1422          (r) == 175 || (b) == 63 || ((b) >= 68 && (b) <= 127))
1423 #define IS_BOTH_COUNTERS_1004K_EVENT(b)                                 \
1424         ((b) == 0 || (b) == 1 || (b) == 11)
1425 #ifdef CONFIG_MIPS_MT_SMP
1426 #define IS_RANGE_P_1004K_EVENT(r, b)                                    \
1427         ((b) == 0 || (r) == 18 || (b) == 21 || (b) == 22 ||             \
1428          (b) == 25 || (b) == 36 || (b) == 39 || (r) == 44 ||            \
1429          (r) == 174 || (r) == 176 || ((b) >= 50 && (b) <= 59) ||        \
1430          (r) == 188 || (b) == 61 || (b) == 62 ||                        \
1431          ((b) >= 64 && (b) <= 67))
1432 #define IS_RANGE_V_1004K_EVENT(r)       ((r) == 47)
1433 #endif
1434
1435 /*
1436  * User can use 0-255 raw events, where 0-127 for the events of even
1437  * counters, and 128-255 for odd counters. Note that bit 7 is used to
1438  * indicate the parity. So, for example, when user wants to take the
1439  * Event Num of 15 for odd counters (by referring to the user manual),
1440  * then 128 needs to be added to 15 as the input for the event config,
1441  * i.e., 143 (0x8F) to be used.
1442  */
1443 static const struct mips_perf_event *mipsxx_pmu_map_raw_event(u64 config)
1444 {
1445         unsigned int raw_id = config & 0xff;
1446         unsigned int base_id = raw_id & 0x7f;
1447
1448         switch (current_cpu_type()) {
1449         case CPU_24K:
1450                 if (IS_UNSUPPORTED_24K_EVENT(raw_id, base_id))
1451                         return ERR_PTR(-EOPNOTSUPP);
1452                 raw_event.event_id = base_id;
1453                 if (IS_BOTH_COUNTERS_24K_EVENT(base_id))
1454                         raw_event.cntr_mask = CNTR_EVEN | CNTR_ODD;
1455                 else
1456                         raw_event.cntr_mask =
1457                                 raw_id > 127 ? CNTR_ODD : CNTR_EVEN;
1458 #ifdef CONFIG_MIPS_MT_SMP
1459                 /*
1460                  * This is actually doing nothing. Non-multithreading
1461                  * CPUs will not check and calculate the range.
1462                  */
1463                 raw_event.range = P;
1464 #endif
1465                 break;
1466         case CPU_34K:
1467                 if (IS_UNSUPPORTED_34K_EVENT(raw_id, base_id))
1468                         return ERR_PTR(-EOPNOTSUPP);
1469                 raw_event.event_id = base_id;
1470                 if (IS_BOTH_COUNTERS_34K_EVENT(base_id))
1471                         raw_event.cntr_mask = CNTR_EVEN | CNTR_ODD;
1472                 else
1473                         raw_event.cntr_mask =
1474                                 raw_id > 127 ? CNTR_ODD : CNTR_EVEN;
1475 #ifdef CONFIG_MIPS_MT_SMP
1476                 if (IS_RANGE_P_34K_EVENT(raw_id, base_id))
1477                         raw_event.range = P;
1478                 else if (unlikely(IS_RANGE_V_34K_EVENT(raw_id)))
1479                         raw_event.range = V;
1480                 else
1481                         raw_event.range = T;
1482 #endif
1483                 break;
1484         case CPU_74K:
1485                 if (IS_UNSUPPORTED_74K_EVENT(raw_id, base_id))
1486                         return ERR_PTR(-EOPNOTSUPP);
1487                 raw_event.event_id = base_id;
1488                 if (IS_BOTH_COUNTERS_74K_EVENT(base_id))
1489                         raw_event.cntr_mask = CNTR_EVEN | CNTR_ODD;
1490                 else
1491                         raw_event.cntr_mask =
1492                                 raw_id > 127 ? CNTR_ODD : CNTR_EVEN;
1493 #ifdef CONFIG_MIPS_MT_SMP
1494                 raw_event.range = P;
1495 #endif
1496                 break;
1497         case CPU_1004K:
1498                 if (IS_UNSUPPORTED_1004K_EVENT(raw_id, base_id))
1499                         return ERR_PTR(-EOPNOTSUPP);
1500                 raw_event.event_id = base_id;
1501                 if (IS_BOTH_COUNTERS_1004K_EVENT(base_id))
1502                         raw_event.cntr_mask = CNTR_EVEN | CNTR_ODD;
1503                 else
1504                         raw_event.cntr_mask =
1505                                 raw_id > 127 ? CNTR_ODD : CNTR_EVEN;
1506 #ifdef CONFIG_MIPS_MT_SMP
1507                 if (IS_RANGE_P_1004K_EVENT(raw_id, base_id))
1508                         raw_event.range = P;
1509                 else if (unlikely(IS_RANGE_V_1004K_EVENT(raw_id)))
1510                         raw_event.range = V;
1511                 else
1512                         raw_event.range = T;
1513 #endif
1514                 break;
1515         }
1516
1517         return &raw_event;
1518 }
1519
1520 static const struct mips_perf_event *octeon_pmu_map_raw_event(u64 config)
1521 {
1522         unsigned int raw_id = config & 0xff;
1523         unsigned int base_id = raw_id & 0x7f;
1524
1525
1526         raw_event.cntr_mask = CNTR_ALL;
1527         raw_event.event_id = base_id;
1528
1529         if (current_cpu_type() == CPU_CAVIUM_OCTEON2) {
1530                 if (base_id > 0x42)
1531                         return ERR_PTR(-EOPNOTSUPP);
1532         } else {
1533                 if (base_id > 0x3a)
1534                         return ERR_PTR(-EOPNOTSUPP);
1535         }
1536
1537         switch (base_id) {
1538         case 0x00:
1539         case 0x0f:
1540         case 0x1e:
1541         case 0x1f:
1542         case 0x2f:
1543         case 0x34:
1544         case 0x3b ... 0x3f:
1545                 return ERR_PTR(-EOPNOTSUPP);
1546         default:
1547                 break;
1548         }
1549
1550         return &raw_event;
1551 }
1552
1553 static int __init
1554 init_hw_perf_events(void)
1555 {
1556         int counters, irq;
1557         int counter_bits;
1558
1559         pr_info("Performance counters: ");
1560
1561         counters = n_counters();
1562         if (counters == 0) {
1563                 pr_cont("No available PMU.\n");
1564                 return -ENODEV;
1565         }
1566
1567 #ifdef CONFIG_MIPS_MT_SMP
1568         cpu_has_mipsmt_pertccounters = read_c0_config7() & (1<<19);
1569         if (!cpu_has_mipsmt_pertccounters)
1570                 counters = counters_total_to_per_cpu(counters);
1571 #endif
1572
1573 #ifdef MSC01E_INT_BASE
1574         if (cpu_has_veic) {
1575                 /*
1576                  * Using platform specific interrupt controller defines.
1577                  */
1578                 irq = MSC01E_INT_BASE + MSC01E_INT_PERFCTR;
1579         } else {
1580 #endif
1581                 if (cp0_perfcount_irq >= 0)
1582                         irq = MIPS_CPU_IRQ_BASE + cp0_perfcount_irq;
1583                 else
1584                         irq = -1;
1585 #ifdef MSC01E_INT_BASE
1586         }
1587 #endif
1588
1589         mipspmu.map_raw_event = mipsxx_pmu_map_raw_event;
1590
1591         switch (current_cpu_type()) {
1592         case CPU_24K:
1593                 mipspmu.name = "mips/24K";
1594                 mipspmu.general_event_map = &mipsxxcore_event_map;
1595                 mipspmu.cache_event_map = &mipsxxcore_cache_map;
1596                 break;
1597         case CPU_34K:
1598                 mipspmu.name = "mips/34K";
1599                 mipspmu.general_event_map = &mipsxxcore_event_map;
1600                 mipspmu.cache_event_map = &mipsxxcore_cache_map;
1601                 break;
1602         case CPU_74K:
1603                 mipspmu.name = "mips/74K";
1604                 mipspmu.general_event_map = &mipsxx74Kcore_event_map;
1605                 mipspmu.cache_event_map = &mipsxx74Kcore_cache_map;
1606                 break;
1607         case CPU_1004K:
1608                 mipspmu.name = "mips/1004K";
1609                 mipspmu.general_event_map = &mipsxxcore_event_map;
1610                 mipspmu.cache_event_map = &mipsxxcore_cache_map;
1611                 break;
1612         case CPU_CAVIUM_OCTEON:
1613         case CPU_CAVIUM_OCTEON_PLUS:
1614         case CPU_CAVIUM_OCTEON2:
1615                 mipspmu.name = "octeon";
1616                 mipspmu.general_event_map = &octeon_event_map;
1617                 mipspmu.cache_event_map = &octeon_cache_map;
1618                 mipspmu.map_raw_event = octeon_pmu_map_raw_event;
1619                 break;
1620         default:
1621                 pr_cont("Either hardware does not support performance "
1622                         "counters, or not yet implemented.\n");
1623                 return -ENODEV;
1624         }
1625
1626         mipspmu.num_counters = counters;
1627         mipspmu.irq = irq;
1628
1629         if (read_c0_perfctrl0() & M_PERFCTL_WIDE) {
1630                 mipspmu.max_period = (1ULL << 63) - 1;
1631                 mipspmu.valid_count = (1ULL << 63) - 1;
1632                 mipspmu.overflow = 1ULL << 63;
1633                 mipspmu.read_counter = mipsxx_pmu_read_counter_64;
1634                 mipspmu.write_counter = mipsxx_pmu_write_counter_64;
1635                 counter_bits = 64;
1636         } else {
1637                 mipspmu.max_period = (1ULL << 31) - 1;
1638                 mipspmu.valid_count = (1ULL << 31) - 1;
1639                 mipspmu.overflow = 1ULL << 31;
1640                 mipspmu.read_counter = mipsxx_pmu_read_counter;
1641                 mipspmu.write_counter = mipsxx_pmu_write_counter;
1642                 counter_bits = 32;
1643         }
1644
1645         on_each_cpu(reset_counters, (void *)(long)counters, 1);
1646
1647         pr_cont("%s PMU enabled, %d %d-bit counters available to each "
1648                 "CPU, irq %d%s\n", mipspmu.name, counters, counter_bits, irq,
1649                 irq < 0 ? " (share with timer interrupt)" : "");
1650
1651         perf_pmu_register(&pmu, "cpu", PERF_TYPE_RAW);
1652
1653         return 0;
1654 }
1655 early_initcall(init_hw_perf_events);