kernel/arch/arm/kernel/perf_event_v6.c

   1 /*
   2  * ARMv6 Performance counter handling code.
   3  *
   4  * Copyright (C) 2009 picoChip Designs, Ltd., Jamie Iles
   5  *
   6  * ARMv6 has 2 configurable performance counters and a single cycle counter.
   7  * They all share a single reset bit but can be written to zero so we can use
   8  * that for a reset.
   9  *
  10  * The counters can't be individually enabled or disabled so when we remove
  11  * one event and replace it with another we could get spurious counts from the
  12  * wrong event. However, we can take advantage of the fact that the
  13  * performance counters can export events to the event bus, and the event bus
  14  * itself can be monitored. This requires that we *don't* export the events to
  15  * the event bus. The procedure for disabling a configurable counter is:
  16  *      - change the counter to count the ETMEXTOUT[0] signal (0x20). This
  17  *        effectively stops the counter from counting.
  18  *      - disable the counter's interrupt generation (each counter has it's
  19  *        own interrupt enable bit).
  20  * Once stopped, the counter value can be written as 0 to reset.
  21  *
  22  * To enable a counter:
  23  *      - enable the counter's interrupt generation.
  24  *      - set the new event type.
  25  *
  26  * Note: the dedicated cycle counter only counts cycles and can't be
  27  * enabled/disabled independently of the others. When we want to disable the
  28  * cycle counter, we have to just disable the interrupt reporting and start
  29  * ignoring that counter. When re-enabling, we have to reset the value and
  30  * enable the interrupt.
  31  */
  32
  33 #if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K)
  34 enum armv6_perf_types {
  35         ARMV6_PERFCTR_ICACHE_MISS           = 0x0,
  36         ARMV6_PERFCTR_IBUF_STALL            = 0x1,
  37         ARMV6_PERFCTR_DDEP_STALL            = 0x2,
  38         ARMV6_PERFCTR_ITLB_MISS             = 0x3,
  39         ARMV6_PERFCTR_DTLB_MISS             = 0x4,
  40         ARMV6_PERFCTR_BR_EXEC               = 0x5,
  41         ARMV6_PERFCTR_BR_MISPREDICT         = 0x6,
  42         ARMV6_PERFCTR_INSTR_EXEC            = 0x7,
  43         ARMV6_PERFCTR_DCACHE_HIT            = 0x9,
  44         ARMV6_PERFCTR_DCACHE_ACCESS         = 0xA,
  45         ARMV6_PERFCTR_DCACHE_MISS           = 0xB,
  46         ARMV6_PERFCTR_DCACHE_WBACK          = 0xC,
  47         ARMV6_PERFCTR_SW_PC_CHANGE          = 0xD,
  48         ARMV6_PERFCTR_MAIN_TLB_MISS         = 0xF,
  49         ARMV6_PERFCTR_EXPL_D_ACCESS         = 0x10,
  50         ARMV6_PERFCTR_LSU_FULL_STALL        = 0x11,
  51         ARMV6_PERFCTR_WBUF_DRAINED          = 0x12,
  52         ARMV6_PERFCTR_CPU_CYCLES            = 0xFF,
  53         ARMV6_PERFCTR_NOP                   = 0x20,
  54 };
  55
  56 enum armv6_counters {
  57         ARMV6_CYCLE_COUNTER = 0,
  58         ARMV6_COUNTER0,
  59         ARMV6_COUNTER1,
  60 };
  61
  62 /*
  63  * The hardware events that we support. We do support cache operations but
  64  * we have harvard caches and no way to combine instruction and data
  65  * accesses/misses in hardware.
  66  */
  67 static const unsigned armv6_perf_map[PERF_COUNT_HW_MAX] = {
  68         PERF_MAP_ALL_UNSUPPORTED,
  69         [PERF_COUNT_HW_CPU_CYCLES]              = ARMV6_PERFCTR_CPU_CYCLES,
  70         [PERF_COUNT_HW_INSTRUCTIONS]            = ARMV6_PERFCTR_INSTR_EXEC,
  71         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS]     = ARMV6_PERFCTR_BR_EXEC,
  72         [PERF_COUNT_HW_BRANCH_MISSES]           = ARMV6_PERFCTR_BR_MISPREDICT,
  73         [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = ARMV6_PERFCTR_IBUF_STALL,
  74         [PERF_COUNT_HW_STALLED_CYCLES_BACKEND]  = ARMV6_PERFCTR_LSU_FULL_STALL,
  75 };
  76
  77 static const unsigned armv6_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
  78                                           [PERF_COUNT_HW_CACHE_OP_MAX]
  79                                           [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
  80         PERF_CACHE_MAP_ALL_UNSUPPORTED,
  81
  82         /*
  83          * The performance counters don't differentiate between read and write
  84          * accesses/misses so this isn't strictly correct, but it's the best we
  85          * can do. Writes and reads get combined.
  86          */
  87         [C(L1D)][C(OP_READ)][C(RESULT_ACCESS)]  = ARMV6_PERFCTR_DCACHE_ACCESS,
  88         [C(L1D)][C(OP_READ)][C(RESULT_MISS)]    = ARMV6_PERFCTR_DCACHE_MISS,
  89         [C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV6_PERFCTR_DCACHE_ACCESS,
  90         [C(L1D)][C(OP_WRITE)][C(RESULT_MISS)]   = ARMV6_PERFCTR_DCACHE_MISS,
  91
  92         [C(L1I)][C(OP_READ)][C(RESULT_MISS)]    = ARMV6_PERFCTR_ICACHE_MISS,
  93
  94         /*
  95          * The ARM performance counters can count micro DTLB misses, micro ITLB
  96          * misses and main TLB misses. There isn't an event for TLB misses, so
  97          * use the micro misses here and if users want the main TLB misses they
  98          * can use a raw counter.
  99          */
 100         [C(DTLB)][C(OP_READ)][C(RESULT_MISS)]   = ARMV6_PERFCTR_DTLB_MISS,
 101         [C(DTLB)][C(OP_WRITE)][C(RESULT_MISS)]  = ARMV6_PERFCTR_DTLB_MISS,
 102
 103         [C(ITLB)][C(OP_READ)][C(RESULT_MISS)]   = ARMV6_PERFCTR_ITLB_MISS,
 104         [C(ITLB)][C(OP_WRITE)][C(RESULT_MISS)]  = ARMV6_PERFCTR_ITLB_MISS,
 105 };
 106
 107 enum armv6mpcore_perf_types {
 108         ARMV6MPCORE_PERFCTR_ICACHE_MISS     = 0x0,
 109         ARMV6MPCORE_PERFCTR_IBUF_STALL      = 0x1,
 110         ARMV6MPCORE_PERFCTR_DDEP_STALL      = 0x2,
 111         ARMV6MPCORE_PERFCTR_ITLB_MISS       = 0x3,
 112         ARMV6MPCORE_PERFCTR_DTLB_MISS       = 0x4,
 113         ARMV6MPCORE_PERFCTR_BR_EXEC         = 0x5,
 114         ARMV6MPCORE_PERFCTR_BR_NOTPREDICT   = 0x6,
 115         ARMV6MPCORE_PERFCTR_BR_MISPREDICT   = 0x7,
 116         ARMV6MPCORE_PERFCTR_INSTR_EXEC      = 0x8,
 117         ARMV6MPCORE_PERFCTR_DCACHE_RDACCESS = 0xA,
 118         ARMV6MPCORE_PERFCTR_DCACHE_RDMISS   = 0xB,
 119         ARMV6MPCORE_PERFCTR_DCACHE_WRACCESS = 0xC,
 120         ARMV6MPCORE_PERFCTR_DCACHE_WRMISS   = 0xD,
 121         ARMV6MPCORE_PERFCTR_DCACHE_EVICTION = 0xE,
 122         ARMV6MPCORE_PERFCTR_SW_PC_CHANGE    = 0xF,
 123         ARMV6MPCORE_PERFCTR_MAIN_TLB_MISS   = 0x10,
 124         ARMV6MPCORE_PERFCTR_EXPL_MEM_ACCESS = 0x11,
 125         ARMV6MPCORE_PERFCTR_LSU_FULL_STALL  = 0x12,
 126         ARMV6MPCORE_PERFCTR_WBUF_DRAINED    = 0x13,
 127         ARMV6MPCORE_PERFCTR_CPU_CYCLES      = 0xFF,
 128 };
 129
 130 /*
 131  * The hardware events that we support. We do support cache operations but
 132  * we have harvard caches and no way to combine instruction and data
 133  * accesses/misses in hardware.
 134  */
 135 static const unsigned armv6mpcore_perf_map[PERF_COUNT_HW_MAX] = {
 136         PERF_MAP_ALL_UNSUPPORTED,
 137         [PERF_COUNT_HW_CPU_CYCLES]              = ARMV6MPCORE_PERFCTR_CPU_CYCLES,
 138         [PERF_COUNT_HW_INSTRUCTIONS]            = ARMV6MPCORE_PERFCTR_INSTR_EXEC,
 139         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS]     = ARMV6MPCORE_PERFCTR_BR_EXEC,
 140         [PERF_COUNT_HW_BRANCH_MISSES]           = ARMV6MPCORE_PERFCTR_BR_MISPREDICT,
 141         [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = ARMV6MPCORE_PERFCTR_IBUF_STALL,
 142         [PERF_COUNT_HW_STALLED_CYCLES_BACKEND]  = ARMV6MPCORE_PERFCTR_LSU_FULL_STALL,
 143 };
 144
 145 static const unsigned armv6mpcore_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
 146                                         [PERF_COUNT_HW_CACHE_OP_MAX]
 147                                         [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
 148         PERF_CACHE_MAP_ALL_UNSUPPORTED,
 149
 150         [C(L1D)][C(OP_READ)][C(RESULT_ACCESS)]  = ARMV6MPCORE_PERFCTR_DCACHE_RDACCESS,
 151         [C(L1D)][C(OP_READ)][C(RESULT_MISS)]    = ARMV6MPCORE_PERFCTR_DCACHE_RDMISS,
 152         [C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV6MPCORE_PERFCTR_DCACHE_WRACCESS,
 153         [C(L1D)][C(OP_WRITE)][C(RESULT_MISS)]   = ARMV6MPCORE_PERFCTR_DCACHE_WRMISS,
 154
 155         [C(L1I)][C(OP_READ)][C(RESULT_MISS)]    = ARMV6MPCORE_PERFCTR_ICACHE_MISS,
 156
 157         /*
 158          * The ARM performance counters can count micro DTLB misses, micro ITLB
 159          * misses and main TLB misses. There isn't an event for TLB misses, so
 160          * use the micro misses here and if users want the main TLB misses they
 161          * can use a raw counter.
 162          */
 163         [C(DTLB)][C(OP_READ)][C(RESULT_MISS)]   = ARMV6MPCORE_PERFCTR_DTLB_MISS,
 164         [C(DTLB)][C(OP_WRITE)][C(RESULT_MISS)]  = ARMV6MPCORE_PERFCTR_DTLB_MISS,
 165
 166         [C(ITLB)][C(OP_READ)][C(RESULT_MISS)]   = ARMV6MPCORE_PERFCTR_ITLB_MISS,
 167         [C(ITLB)][C(OP_WRITE)][C(RESULT_MISS)]  = ARMV6MPCORE_PERFCTR_ITLB_MISS,
 168 };
 169
 170 static inline unsigned long
 171 armv6_pmcr_read(void)
 172 {
 173         u32 val;
 174         asm volatile("mrc   p15, 0, %0, c15, c12, 0" : "=r"(val));
 175         return val;
 176 }
 177
 178 static inline void
 179 armv6_pmcr_write(unsigned long val)
 180 {
 181         asm volatile("mcr   p15, 0, %0, c15, c12, 0" : : "r"(val));
 182 }
 183
 184 #define ARMV6_PMCR_ENABLE               (1 << 0)
 185 #define ARMV6_PMCR_CTR01_RESET          (1 << 1)
 186 #define ARMV6_PMCR_CCOUNT_RESET         (1 << 2)
 187 #define ARMV6_PMCR_CCOUNT_DIV           (1 << 3)
 188 #define ARMV6_PMCR_COUNT0_IEN           (1 << 4)
 189 #define ARMV6_PMCR_COUNT1_IEN           (1 << 5)
 190 #define ARMV6_PMCR_CCOUNT_IEN           (1 << 6)
 191 #define ARMV6_PMCR_COUNT0_OVERFLOW      (1 << 8)
 192 #define ARMV6_PMCR_COUNT1_OVERFLOW      (1 << 9)
 193 #define ARMV6_PMCR_CCOUNT_OVERFLOW      (1 << 10)
 194 #define ARMV6_PMCR_EVT_COUNT0_SHIFT     20
 195 #define ARMV6_PMCR_EVT_COUNT0_MASK      (0xFF << ARMV6_PMCR_EVT_COUNT0_SHIFT)
 196 #define ARMV6_PMCR_EVT_COUNT1_SHIFT     12
 197 #define ARMV6_PMCR_EVT_COUNT1_MASK      (0xFF << ARMV6_PMCR_EVT_COUNT1_SHIFT)
 198
 199 #define ARMV6_PMCR_OVERFLOWED_MASK \
 200         (ARMV6_PMCR_COUNT0_OVERFLOW | ARMV6_PMCR_COUNT1_OVERFLOW | \
 201          ARMV6_PMCR_CCOUNT_OVERFLOW)
 202
 203 static inline int
 204 armv6_pmcr_has_overflowed(unsigned long pmcr)
 205 {
 206         return pmcr & ARMV6_PMCR_OVERFLOWED_MASK;
 207 }
 208
 209 static inline int
 210 armv6_pmcr_counter_has_overflowed(unsigned long pmcr,
 211                                   enum armv6_counters counter)
 212 {
 213         int ret = 0;
 214
 215         if (ARMV6_CYCLE_COUNTER == counter)
 216                 ret = pmcr & ARMV6_PMCR_CCOUNT_OVERFLOW;
 217         else if (ARMV6_COUNTER0 == counter)
 218                 ret = pmcr & ARMV6_PMCR_COUNT0_OVERFLOW;
 219         else if (ARMV6_COUNTER1 == counter)
 220                 ret = pmcr & ARMV6_PMCR_COUNT1_OVERFLOW;
 221         else
 222                 WARN_ONCE(1, "invalid counter number (%d)\n", counter);
 223
 224         return ret;
 225 }
 226
 227 static inline u32 armv6pmu_read_counter(struct perf_event *event)
 228 {
 229         struct hw_perf_event *hwc = &event->hw;
 230         int counter = hwc->idx;
 231         unsigned long value = 0;
 232
 233         if (ARMV6_CYCLE_COUNTER == counter)
 234                 asm volatile("mrc   p15, 0, %0, c15, c12, 1" : "=r"(value));
 235         else if (ARMV6_COUNTER0 == counter)
 236                 asm volatile("mrc   p15, 0, %0, c15, c12, 2" : "=r"(value));
 237         else if (ARMV6_COUNTER1 == counter)
 238                 asm volatile("mrc   p15, 0, %0, c15, c12, 3" : "=r"(value));
 239         else
 240                 WARN_ONCE(1, "invalid counter number (%d)\n", counter);
 241
 242         return value;
 243 }
 244
 245 static inline void armv6pmu_write_counter(struct perf_event *event, u32 value)
 246 {
 247         struct hw_perf_event *hwc = &event->hw;
 248         int counter = hwc->idx;
 249
 250         if (ARMV6_CYCLE_COUNTER == counter)
 251                 asm volatile("mcr   p15, 0, %0, c15, c12, 1" : : "r"(value));
 252         else if (ARMV6_COUNTER0 == counter)
 253                 asm volatile("mcr   p15, 0, %0, c15, c12, 2" : : "r"(value));
 254         else if (ARMV6_COUNTER1 == counter)
 255                 asm volatile("mcr   p15, 0, %0, c15, c12, 3" : : "r"(value));
 256         else
 257                 WARN_ONCE(1, "invalid counter number (%d)\n", counter);
 258 }
 259
 260 static void armv6pmu_enable_event(struct perf_event *event)
 261 {
 262         unsigned long val, mask, evt, flags;
 263         struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
 264         struct hw_perf_event *hwc = &event->hw;
 265         struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
 266         int idx = hwc->idx;
 267
 268         if (ARMV6_CYCLE_COUNTER == idx) {
 269                 mask    = 0;
 270                 evt     = ARMV6_PMCR_CCOUNT_IEN;
 271         } else if (ARMV6_COUNTER0 == idx) {
 272                 mask    = ARMV6_PMCR_EVT_COUNT0_MASK;
 273                 evt     = (hwc->config_base << ARMV6_PMCR_EVT_COUNT0_SHIFT) |
 274                           ARMV6_PMCR_COUNT0_IEN;
 275         } else if (ARMV6_COUNTER1 == idx) {
 276                 mask    = ARMV6_PMCR_EVT_COUNT1_MASK;
 277                 evt     = (hwc->config_base << ARMV6_PMCR_EVT_COUNT1_SHIFT) |
 278                           ARMV6_PMCR_COUNT1_IEN;
 279         } else {
 280                 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
 281                 return;
 282         }
 283
 284         /*
 285          * Mask out the current event and set the counter to count the event
 286          * that we're interested in.
 287          */
 288         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 289         val = armv6_pmcr_read();
 290         val &= ~mask;
 291         val |= evt;
 292         armv6_pmcr_write(val);
 293         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 294 }
 295
 296 static irqreturn_t
 297 armv6pmu_handle_irq(int irq_num,
 298                     void *dev)
 299 {
 300         unsigned long pmcr = armv6_pmcr_read();
 301         struct perf_sample_data data;
 302         struct arm_pmu *cpu_pmu = (struct arm_pmu *)dev;
 303         struct pmu_hw_events *cpuc = this_cpu_ptr(cpu_pmu->hw_events);
 304         struct pt_regs *regs;
 305         int idx;
 306
 307         if (!armv6_pmcr_has_overflowed(pmcr))
 308                 return IRQ_NONE;
 309
 310         regs = get_irq_regs();
 311
 312         /*
 313          * The interrupts are cleared by writing the overflow flags back to
 314          * the control register. All of the other bits don't have any effect
 315          * if they are rewritten, so write the whole value back.
 316          */
 317         armv6_pmcr_write(pmcr);
 318
 319         for (idx = 0; idx < cpu_pmu->num_events; ++idx) {
 320                 struct perf_event *event = cpuc->events[idx];
 321                 struct hw_perf_event *hwc;
 322
 323                 /* Ignore if we don't have an event. */
 324                 if (!event)
 325                         continue;
 326
 327                 /*
 328                  * We have a single interrupt for all counters. Check that
 329                  * each counter has overflowed before we process it.
 330                  */
 331                 if (!armv6_pmcr_counter_has_overflowed(pmcr, idx))
 332                         continue;
 333
 334                 hwc = &event->hw;
 335                 armpmu_event_update(event);
 336                 perf_sample_data_init(&data, 0, hwc->last_period);
 337                 if (!armpmu_event_set_period(event))
 338                         continue;
 339
 340                 if (perf_event_overflow(event, &data, regs))
 341                         cpu_pmu->disable(event);
 342         }
 343
 344         /*
 345          * Handle the pending perf events.
 346          *
 347          * Note: this call *must* be run with interrupts disabled. For
 348          * platforms that can have the PMU interrupts raised as an NMI, this
 349          * will not work.
 350          */
 351         irq_work_run();
 352
 353         return IRQ_HANDLED;
 354 }
 355
 356 static void armv6pmu_start(struct arm_pmu *cpu_pmu)
 357 {
 358         unsigned long flags, val;
 359         struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
 360
 361         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 362         val = armv6_pmcr_read();
 363         val |= ARMV6_PMCR_ENABLE;
 364         armv6_pmcr_write(val);
 365         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 366 }
 367
 368 static void armv6pmu_stop(struct arm_pmu *cpu_pmu)
 369 {
 370         unsigned long flags, val;
 371         struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
 372
 373         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 374         val = armv6_pmcr_read();
 375         val &= ~ARMV6_PMCR_ENABLE;
 376         armv6_pmcr_write(val);
 377         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 378 }
 379
 380 static int
 381 armv6pmu_get_event_idx(struct pmu_hw_events *cpuc,
 382                                 struct perf_event *event)
 383 {
 384         struct hw_perf_event *hwc = &event->hw;
 385         /* Always place a cycle counter into the cycle counter. */
 386         if (ARMV6_PERFCTR_CPU_CYCLES == hwc->config_base) {
 387                 if (test_and_set_bit(ARMV6_CYCLE_COUNTER, cpuc->used_mask))
 388                         return -EAGAIN;
 389
 390                 return ARMV6_CYCLE_COUNTER;
 391         } else {
 392                 /*
 393                  * For anything other than a cycle counter, try and use
 394                  * counter0 and counter1.
 395                  */
 396                 if (!test_and_set_bit(ARMV6_COUNTER1, cpuc->used_mask))
 397                         return ARMV6_COUNTER1;
 398
 399                 if (!test_and_set_bit(ARMV6_COUNTER0, cpuc->used_mask))
 400                         return ARMV6_COUNTER0;
 401
 402                 /* The counters are all in use. */
 403                 return -EAGAIN;
 404         }
 405 }
 406
 407 static void armv6pmu_disable_event(struct perf_event *event)
 408 {
 409         unsigned long val, mask, evt, flags;
 410         struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
 411         struct hw_perf_event *hwc = &event->hw;
 412         struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
 413         int idx = hwc->idx;
 414
 415         if (ARMV6_CYCLE_COUNTER == idx) {
 416                 mask    = ARMV6_PMCR_CCOUNT_IEN;
 417                 evt     = 0;
 418         } else if (ARMV6_COUNTER0 == idx) {
 419                 mask    = ARMV6_PMCR_COUNT0_IEN | ARMV6_PMCR_EVT_COUNT0_MASK;
 420                 evt     = ARMV6_PERFCTR_NOP << ARMV6_PMCR_EVT_COUNT0_SHIFT;
 421         } else if (ARMV6_COUNTER1 == idx) {
 422                 mask    = ARMV6_PMCR_COUNT1_IEN | ARMV6_PMCR_EVT_COUNT1_MASK;
 423                 evt     = ARMV6_PERFCTR_NOP << ARMV6_PMCR_EVT_COUNT1_SHIFT;
 424         } else {
 425                 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
 426                 return;
 427         }
 428
 429         /*
 430          * Mask out the current event and set the counter to count the number
 431          * of ETM bus signal assertion cycles. The external reporting should
 432          * be disabled and so this should never increment.
 433          */
 434         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 435         val = armv6_pmcr_read();
 436         val &= ~mask;
 437         val |= evt;
 438         armv6_pmcr_write(val);
 439         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 440 }
 441
 442 static void armv6mpcore_pmu_disable_event(struct perf_event *event)
 443 {
 444         unsigned long val, mask, flags, evt = 0;
 445         struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
 446         struct hw_perf_event *hwc = &event->hw;
 447         struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
 448         int idx = hwc->idx;
 449
 450         if (ARMV6_CYCLE_COUNTER == idx) {
 451                 mask    = ARMV6_PMCR_CCOUNT_IEN;
 452         } else if (ARMV6_COUNTER0 == idx) {
 453                 mask    = ARMV6_PMCR_COUNT0_IEN;
 454         } else if (ARMV6_COUNTER1 == idx) {
 455                 mask    = ARMV6_PMCR_COUNT1_IEN;
 456         } else {
 457                 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
 458                 return;
 459         }
 460
 461         /*
 462          * Unlike UP ARMv6, we don't have a way of stopping the counters. We
 463          * simply disable the interrupt reporting.
 464          */
 465         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 466         val = armv6_pmcr_read();
 467         val &= ~mask;
 468         val |= evt;
 469         armv6_pmcr_write(val);
 470         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 471 }
 472
 473 static int armv6_map_event(struct perf_event *event)
 474 {
 475         return armpmu_map_event(event, &armv6_perf_map,
 476                                 &armv6_perf_cache_map, 0xFF);
 477 }
 478
 479 static void armv6pmu_init(struct arm_pmu *cpu_pmu)
 480 {
 481         cpu_pmu->handle_irq     = armv6pmu_handle_irq;
 482         cpu_pmu->enable         = armv6pmu_enable_event;
 483         cpu_pmu->disable        = armv6pmu_disable_event;
 484         cpu_pmu->read_counter   = armv6pmu_read_counter;
 485         cpu_pmu->write_counter  = armv6pmu_write_counter;
 486         cpu_pmu->get_event_idx  = armv6pmu_get_event_idx;
 487         cpu_pmu->start          = armv6pmu_start;
 488         cpu_pmu->stop           = armv6pmu_stop;
 489         cpu_pmu->map_event      = armv6_map_event;
 490         cpu_pmu->num_events     = 3;
 491         cpu_pmu->max_period     = (1LLU << 32) - 1;
 492 }
 493
 494 static int armv6_1136_pmu_init(struct arm_pmu *cpu_pmu)
 495 {
 496         armv6pmu_init(cpu_pmu);
 497         cpu_pmu->name           = "armv6_1136";
 498         return 0;
 499 }
 500
 501 static int armv6_1156_pmu_init(struct arm_pmu *cpu_pmu)
 502 {
 503         armv6pmu_init(cpu_pmu);
 504         cpu_pmu->name           = "armv6_1156";
 505         return 0;
 506 }
 507
 508 static int armv6_1176_pmu_init(struct arm_pmu *cpu_pmu)
 509 {
 510         armv6pmu_init(cpu_pmu);
 511         cpu_pmu->name           = "armv6_1176";
 512         return 0;
 513 }
 514
 515 /*
 516  * ARMv6mpcore is almost identical to single core ARMv6 with the exception
 517  * that some of the events have different enumerations and that there is no
 518  * *hack* to stop the programmable counters. To stop the counters we simply
 519  * disable the interrupt reporting and update the event. When unthrottling we
 520  * reset the period and enable the interrupt reporting.
 521  */
 522
 523 static int armv6mpcore_map_event(struct perf_event *event)
 524 {
 525         return armpmu_map_event(event, &armv6mpcore_perf_map,
 526                                 &armv6mpcore_perf_cache_map, 0xFF);
 527 }
 528
 529 static int armv6mpcore_pmu_init(struct arm_pmu *cpu_pmu)
 530 {
 531         cpu_pmu->name           = "armv6_11mpcore";
 532         cpu_pmu->handle_irq     = armv6pmu_handle_irq;
 533         cpu_pmu->enable         = armv6pmu_enable_event;
 534         cpu_pmu->disable        = armv6mpcore_pmu_disable_event;
 535         cpu_pmu->read_counter   = armv6pmu_read_counter;
 536         cpu_pmu->write_counter  = armv6pmu_write_counter;
 537         cpu_pmu->get_event_idx  = armv6pmu_get_event_idx;
 538         cpu_pmu->start          = armv6pmu_start;
 539         cpu_pmu->stop           = armv6pmu_stop;
 540         cpu_pmu->map_event      = armv6mpcore_map_event;
 541         cpu_pmu->num_events     = 3;
 542         cpu_pmu->max_period     = (1LLU << 32) - 1;
 543
 544         return 0;
 545 }
 546 #else
 547 static int armv6_1136_pmu_init(struct arm_pmu *cpu_pmu)
 548 {
 549         return -ENODEV;
 550 }
 551
 552 static int armv6_1156_pmu_init(struct arm_pmu *cpu_pmu)
 553 {
 554         return -ENODEV;
 555 }
 556
 557 static int armv6_1176_pmu_init(struct arm_pmu *cpu_pmu)
 558 {
 559         return -ENODEV;
 560 }
 561
 562 static int armv6mpcore_pmu_init(struct arm_pmu *cpu_pmu)
 563 {
 564         return -ENODEV;
 565 }
 566 #endif  /* CONFIG_CPU_V6 || CONFIG_CPU_V6K */