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 = 1,
  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_COUNT_HW_CPU_CYCLES]          = ARMV6_PERFCTR_CPU_CYCLES,
  69         [PERF_COUNT_HW_INSTRUCTIONS]        = ARMV6_PERFCTR_INSTR_EXEC,
  70         [PERF_COUNT_HW_CACHE_REFERENCES]    = HW_OP_UNSUPPORTED,
  71         [PERF_COUNT_HW_CACHE_MISSES]        = HW_OP_UNSUPPORTED,
  72         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = ARMV6_PERFCTR_BR_EXEC,
  73         [PERF_COUNT_HW_BRANCH_MISSES]       = ARMV6_PERFCTR_BR_MISPREDICT,
  74         [PERF_COUNT_HW_BUS_CYCLES]          = HW_OP_UNSUPPORTED,
  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         [C(L1D)] = {
  81                 /*
  82                  * The performance counters don't differentiate between read
  83                  * and write accesses/misses so this isn't strictly correct,
  84                  * but it's the best we can do. Writes and reads get
  85                  * combined.
  86                  */
  87                 [C(OP_READ)] = {
  88                         [C(RESULT_ACCESS)]      = ARMV6_PERFCTR_DCACHE_ACCESS,
  89                         [C(RESULT_MISS)]        = ARMV6_PERFCTR_DCACHE_MISS,
  90                 },
  91                 [C(OP_WRITE)] = {
  92                         [C(RESULT_ACCESS)]      = ARMV6_PERFCTR_DCACHE_ACCESS,
  93                         [C(RESULT_MISS)]        = ARMV6_PERFCTR_DCACHE_MISS,
  94                 },
  95                 [C(OP_PREFETCH)] = {
  96                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
  97                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
  98                 },
  99         },
 100         [C(L1I)] = {
 101                 [C(OP_READ)] = {
 102                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 103                         [C(RESULT_MISS)]        = ARMV6_PERFCTR_ICACHE_MISS,
 104                 },
 105                 [C(OP_WRITE)] = {
 106                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 107                         [C(RESULT_MISS)]        = ARMV6_PERFCTR_ICACHE_MISS,
 108                 },
 109                 [C(OP_PREFETCH)] = {
 110                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 111                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 112                 },
 113         },
 114         [C(LL)] = {
 115                 [C(OP_READ)] = {
 116                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 117                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 118                 },
 119                 [C(OP_WRITE)] = {
 120                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 121                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 122                 },
 123                 [C(OP_PREFETCH)] = {
 124                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 125                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 126                 },
 127         },
 128         [C(DTLB)] = {
 129                 /*
 130                  * The ARM performance counters can count micro DTLB misses,
 131                  * micro ITLB misses and main TLB misses. There isn't an event
 132                  * for TLB misses, so use the micro misses here and if users
 133                  * want the main TLB misses they can use a raw counter.
 134                  */
 135                 [C(OP_READ)] = {
 136                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 137                         [C(RESULT_MISS)]        = ARMV6_PERFCTR_DTLB_MISS,
 138                 },
 139                 [C(OP_WRITE)] = {
 140                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 141                         [C(RESULT_MISS)]        = ARMV6_PERFCTR_DTLB_MISS,
 142                 },
 143                 [C(OP_PREFETCH)] = {
 144                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 145                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 146                 },
 147         },
 148         [C(ITLB)] = {
 149                 [C(OP_READ)] = {
 150                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 151                         [C(RESULT_MISS)]        = ARMV6_PERFCTR_ITLB_MISS,
 152                 },
 153                 [C(OP_WRITE)] = {
 154                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 155                         [C(RESULT_MISS)]        = ARMV6_PERFCTR_ITLB_MISS,
 156                 },
 157                 [C(OP_PREFETCH)] = {
 158                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 159                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 160                 },
 161         },
 162         [C(BPU)] = {
 163                 [C(OP_READ)] = {
 164                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 165                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 166                 },
 167                 [C(OP_WRITE)] = {
 168                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 169                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 170                 },
 171                 [C(OP_PREFETCH)] = {
 172                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 173                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 174                 },
 175         },
 176         [C(NODE)] = {
 177                 [C(OP_READ)] = {
 178                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 179                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 180                 },
 181                 [C(OP_WRITE)] = {
 182                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 183                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 184                 },
 185                 [C(OP_PREFETCH)] = {
 186                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 187                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 188                 },
 189         },
 190 };
 191
 192 enum armv6mpcore_perf_types {
 193         ARMV6MPCORE_PERFCTR_ICACHE_MISS     = 0x0,
 194         ARMV6MPCORE_PERFCTR_IBUF_STALL      = 0x1,
 195         ARMV6MPCORE_PERFCTR_DDEP_STALL      = 0x2,
 196         ARMV6MPCORE_PERFCTR_ITLB_MISS       = 0x3,
 197         ARMV6MPCORE_PERFCTR_DTLB_MISS       = 0x4,
 198         ARMV6MPCORE_PERFCTR_BR_EXEC         = 0x5,
 199         ARMV6MPCORE_PERFCTR_BR_NOTPREDICT   = 0x6,
 200         ARMV6MPCORE_PERFCTR_BR_MISPREDICT   = 0x7,
 201         ARMV6MPCORE_PERFCTR_INSTR_EXEC      = 0x8,
 202         ARMV6MPCORE_PERFCTR_DCACHE_RDACCESS = 0xA,
 203         ARMV6MPCORE_PERFCTR_DCACHE_RDMISS   = 0xB,
 204         ARMV6MPCORE_PERFCTR_DCACHE_WRACCESS = 0xC,
 205         ARMV6MPCORE_PERFCTR_DCACHE_WRMISS   = 0xD,
 206         ARMV6MPCORE_PERFCTR_DCACHE_EVICTION = 0xE,
 207         ARMV6MPCORE_PERFCTR_SW_PC_CHANGE    = 0xF,
 208         ARMV6MPCORE_PERFCTR_MAIN_TLB_MISS   = 0x10,
 209         ARMV6MPCORE_PERFCTR_EXPL_MEM_ACCESS = 0x11,
 210         ARMV6MPCORE_PERFCTR_LSU_FULL_STALL  = 0x12,
 211         ARMV6MPCORE_PERFCTR_WBUF_DRAINED    = 0x13,
 212         ARMV6MPCORE_PERFCTR_CPU_CYCLES      = 0xFF,
 213 };
 214
 215 /*
 216  * The hardware events that we support. We do support cache operations but
 217  * we have harvard caches and no way to combine instruction and data
 218  * accesses/misses in hardware.
 219  */
 220 static const unsigned armv6mpcore_perf_map[PERF_COUNT_HW_MAX] = {
 221         [PERF_COUNT_HW_CPU_CYCLES]          = ARMV6MPCORE_PERFCTR_CPU_CYCLES,
 222         [PERF_COUNT_HW_INSTRUCTIONS]        = ARMV6MPCORE_PERFCTR_INSTR_EXEC,
 223         [PERF_COUNT_HW_CACHE_REFERENCES]    = HW_OP_UNSUPPORTED,
 224         [PERF_COUNT_HW_CACHE_MISSES]        = HW_OP_UNSUPPORTED,
 225         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = ARMV6MPCORE_PERFCTR_BR_EXEC,
 226         [PERF_COUNT_HW_BRANCH_MISSES]       = ARMV6MPCORE_PERFCTR_BR_MISPREDICT,
 227         [PERF_COUNT_HW_BUS_CYCLES]          = HW_OP_UNSUPPORTED,
 228 };
 229
 230 static const unsigned armv6mpcore_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
 231                                         [PERF_COUNT_HW_CACHE_OP_MAX]
 232                                         [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
 233         [C(L1D)] = {
 234                 [C(OP_READ)] = {
 235                         [C(RESULT_ACCESS)]  =
 236                                 ARMV6MPCORE_PERFCTR_DCACHE_RDACCESS,
 237                         [C(RESULT_MISS)]    =
 238                                 ARMV6MPCORE_PERFCTR_DCACHE_RDMISS,
 239                 },
 240                 [C(OP_WRITE)] = {
 241                         [C(RESULT_ACCESS)]  =
 242                                 ARMV6MPCORE_PERFCTR_DCACHE_WRACCESS,
 243                         [C(RESULT_MISS)]    =
 244                                 ARMV6MPCORE_PERFCTR_DCACHE_WRMISS,
 245                 },
 246                 [C(OP_PREFETCH)] = {
 247                         [C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,
 248                         [C(RESULT_MISS)]    = CACHE_OP_UNSUPPORTED,
 249                 },
 250         },
 251         [C(L1I)] = {
 252                 [C(OP_READ)] = {
 253                         [C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,
 254                         [C(RESULT_MISS)]    = ARMV6MPCORE_PERFCTR_ICACHE_MISS,
 255                 },
 256                 [C(OP_WRITE)] = {
 257                         [C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,
 258                         [C(RESULT_MISS)]    = ARMV6MPCORE_PERFCTR_ICACHE_MISS,
 259                 },
 260                 [C(OP_PREFETCH)] = {
 261                         [C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,
 262                         [C(RESULT_MISS)]    = CACHE_OP_UNSUPPORTED,
 263                 },
 264         },
 265         [C(LL)] = {
 266                 [C(OP_READ)] = {
 267                         [C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,
 268                         [C(RESULT_MISS)]    = CACHE_OP_UNSUPPORTED,
 269                 },
 270                 [C(OP_WRITE)] = {
 271                         [C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,
 272                         [C(RESULT_MISS)]    = CACHE_OP_UNSUPPORTED,
 273                 },
 274                 [C(OP_PREFETCH)] = {
 275                         [C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,
 276                         [C(RESULT_MISS)]    = CACHE_OP_UNSUPPORTED,
 277                 },
 278         },
 279         [C(DTLB)] = {
 280                 /*
 281                  * The ARM performance counters can count micro DTLB misses,
 282                  * micro ITLB misses and main TLB misses. There isn't an event
 283                  * for TLB misses, so use the micro misses here and if users
 284                  * want the main TLB misses they can use a raw counter.
 285                  */
 286                 [C(OP_READ)] = {
 287                         [C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,
 288                         [C(RESULT_MISS)]    = ARMV6MPCORE_PERFCTR_DTLB_MISS,
 289                 },
 290                 [C(OP_WRITE)] = {
 291                         [C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,
 292                         [C(RESULT_MISS)]    = ARMV6MPCORE_PERFCTR_DTLB_MISS,
 293                 },
 294                 [C(OP_PREFETCH)] = {
 295                         [C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,
 296                         [C(RESULT_MISS)]    = CACHE_OP_UNSUPPORTED,
 297                 },
 298         },
 299         [C(ITLB)] = {
 300                 [C(OP_READ)] = {
 301                         [C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,
 302                         [C(RESULT_MISS)]    = ARMV6MPCORE_PERFCTR_ITLB_MISS,
 303                 },
 304                 [C(OP_WRITE)] = {
 305                         [C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,
 306                         [C(RESULT_MISS)]    = ARMV6MPCORE_PERFCTR_ITLB_MISS,
 307                 },
 308                 [C(OP_PREFETCH)] = {
 309                         [C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,
 310                         [C(RESULT_MISS)]    = CACHE_OP_UNSUPPORTED,
 311                 },
 312         },
 313         [C(BPU)] = {
 314                 [C(OP_READ)] = {
 315                         [C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,
 316                         [C(RESULT_MISS)]    = CACHE_OP_UNSUPPORTED,
 317                 },
 318                 [C(OP_WRITE)] = {
 319                         [C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,
 320                         [C(RESULT_MISS)]    = CACHE_OP_UNSUPPORTED,
 321                 },
 322                 [C(OP_PREFETCH)] = {
 323                         [C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,
 324                         [C(RESULT_MISS)]    = CACHE_OP_UNSUPPORTED,
 325                 },
 326         },
 327         [C(NODE)] = {
 328                 [C(OP_READ)] = {
 329                         [C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,
 330                         [C(RESULT_MISS)]    = CACHE_OP_UNSUPPORTED,
 331                 },
 332                 [C(OP_WRITE)] = {
 333                         [C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,
 334                         [C(RESULT_MISS)]    = CACHE_OP_UNSUPPORTED,
 335                 },
 336                 [C(OP_PREFETCH)] = {
 337                         [C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,
 338                         [C(RESULT_MISS)]    = CACHE_OP_UNSUPPORTED,
 339                 },
 340         },
 341 };
 342
 343 static inline unsigned long
 344 armv6_pmcr_read(void)
 345 {
 346         u32 val;
 347         asm volatile("mrc   p15, 0, %0, c15, c12, 0" : "=r"(val));
 348         return val;
 349 }
 350
 351 static inline void
 352 armv6_pmcr_write(unsigned long val)
 353 {
 354         asm volatile("mcr   p15, 0, %0, c15, c12, 0" : : "r"(val));
 355 }
 356
 357 #define ARMV6_PMCR_ENABLE               (1 << 0)
 358 #define ARMV6_PMCR_CTR01_RESET          (1 << 1)
 359 #define ARMV6_PMCR_CCOUNT_RESET         (1 << 2)
 360 #define ARMV6_PMCR_CCOUNT_DIV           (1 << 3)
 361 #define ARMV6_PMCR_COUNT0_IEN           (1 << 4)
 362 #define ARMV6_PMCR_COUNT1_IEN           (1 << 5)
 363 #define ARMV6_PMCR_CCOUNT_IEN           (1 << 6)
 364 #define ARMV6_PMCR_COUNT0_OVERFLOW      (1 << 8)
 365 #define ARMV6_PMCR_COUNT1_OVERFLOW      (1 << 9)
 366 #define ARMV6_PMCR_CCOUNT_OVERFLOW      (1 << 10)
 367 #define ARMV6_PMCR_EVT_COUNT0_SHIFT     20
 368 #define ARMV6_PMCR_EVT_COUNT0_MASK      (0xFF << ARMV6_PMCR_EVT_COUNT0_SHIFT)
 369 #define ARMV6_PMCR_EVT_COUNT1_SHIFT     12
 370 #define ARMV6_PMCR_EVT_COUNT1_MASK      (0xFF << ARMV6_PMCR_EVT_COUNT1_SHIFT)
 371
 372 #define ARMV6_PMCR_OVERFLOWED_MASK \
 373         (ARMV6_PMCR_COUNT0_OVERFLOW | ARMV6_PMCR_COUNT1_OVERFLOW | \
 374          ARMV6_PMCR_CCOUNT_OVERFLOW)
 375
 376 static inline int
 377 armv6_pmcr_has_overflowed(unsigned long pmcr)
 378 {
 379         return pmcr & ARMV6_PMCR_OVERFLOWED_MASK;
 380 }
 381
 382 static inline int
 383 armv6_pmcr_counter_has_overflowed(unsigned long pmcr,
 384                                   enum armv6_counters counter)
 385 {
 386         int ret = 0;
 387
 388         if (ARMV6_CYCLE_COUNTER == counter)
 389                 ret = pmcr & ARMV6_PMCR_CCOUNT_OVERFLOW;
 390         else if (ARMV6_COUNTER0 == counter)
 391                 ret = pmcr & ARMV6_PMCR_COUNT0_OVERFLOW;
 392         else if (ARMV6_COUNTER1 == counter)
 393                 ret = pmcr & ARMV6_PMCR_COUNT1_OVERFLOW;
 394         else
 395                 WARN_ONCE(1, "invalid counter number (%d)\n", counter);
 396
 397         return ret;
 398 }
 399
 400 static inline u32
 401 armv6pmu_read_counter(int counter)
 402 {
 403         unsigned long value = 0;
 404
 405         if (ARMV6_CYCLE_COUNTER == counter)
 406                 asm volatile("mrc   p15, 0, %0, c15, c12, 1" : "=r"(value));
 407         else if (ARMV6_COUNTER0 == counter)
 408                 asm volatile("mrc   p15, 0, %0, c15, c12, 2" : "=r"(value));
 409         else if (ARMV6_COUNTER1 == counter)
 410                 asm volatile("mrc   p15, 0, %0, c15, c12, 3" : "=r"(value));
 411         else
 412                 WARN_ONCE(1, "invalid counter number (%d)\n", counter);
 413
 414         return value;
 415 }
 416
 417 static inline void
 418 armv6pmu_write_counter(int counter,
 419                        u32 value)
 420 {
 421         if (ARMV6_CYCLE_COUNTER == counter)
 422                 asm volatile("mcr   p15, 0, %0, c15, c12, 1" : : "r"(value));
 423         else if (ARMV6_COUNTER0 == counter)
 424                 asm volatile("mcr   p15, 0, %0, c15, c12, 2" : : "r"(value));
 425         else if (ARMV6_COUNTER1 == counter)
 426                 asm volatile("mcr   p15, 0, %0, c15, c12, 3" : : "r"(value));
 427         else
 428                 WARN_ONCE(1, "invalid counter number (%d)\n", counter);
 429 }
 430
 431 static void
 432 armv6pmu_enable_event(struct hw_perf_event *hwc,
 433                       int idx)
 434 {
 435         unsigned long val, mask, evt, flags;
 436
 437         if (ARMV6_CYCLE_COUNTER == idx) {
 438                 mask    = 0;
 439                 evt     = ARMV6_PMCR_CCOUNT_IEN;
 440         } else if (ARMV6_COUNTER0 == idx) {
 441                 mask    = ARMV6_PMCR_EVT_COUNT0_MASK;
 442                 evt     = (hwc->config_base << ARMV6_PMCR_EVT_COUNT0_SHIFT) |
 443                           ARMV6_PMCR_COUNT0_IEN;
 444         } else if (ARMV6_COUNTER1 == idx) {
 445                 mask    = ARMV6_PMCR_EVT_COUNT1_MASK;
 446                 evt     = (hwc->config_base << ARMV6_PMCR_EVT_COUNT1_SHIFT) |
 447                           ARMV6_PMCR_COUNT1_IEN;
 448         } else {
 449                 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
 450                 return;
 451         }
 452
 453         /*
 454          * Mask out the current event and set the counter to count the event
 455          * that we're interested in.
 456          */
 457         raw_spin_lock_irqsave(&pmu_lock, flags);
 458         val = armv6_pmcr_read();
 459         val &= ~mask;
 460         val |= evt;
 461         armv6_pmcr_write(val);
 462         raw_spin_unlock_irqrestore(&pmu_lock, flags);
 463 }
 464
 465 static irqreturn_t
 466 armv6pmu_handle_irq(int irq_num,
 467                     void *dev)
 468 {
 469         unsigned long pmcr = armv6_pmcr_read();
 470         struct perf_sample_data data;
 471         struct cpu_hw_events *cpuc;
 472         struct pt_regs *regs;
 473         int idx;
 474
 475         if (!armv6_pmcr_has_overflowed(pmcr))
 476                 return IRQ_NONE;
 477
 478         regs = get_irq_regs();
 479
 480         /*
 481          * The interrupts are cleared by writing the overflow flags back to
 482          * the control register. All of the other bits don't have any effect
 483          * if they are rewritten, so write the whole value back.
 484          */
 485         armv6_pmcr_write(pmcr);
 486
 487         perf_sample_data_init(&data, 0);
 488
 489         cpuc = &__get_cpu_var(cpu_hw_events);
 490         for (idx = 0; idx <= armpmu->num_events; ++idx) {
 491                 struct perf_event *event = cpuc->events[idx];
 492                 struct hw_perf_event *hwc;
 493
 494                 if (!test_bit(idx, cpuc->active_mask))
 495                         continue;
 496
 497                 /*
 498                  * We have a single interrupt for all counters. Check that
 499                  * each counter has overflowed before we process it.
 500                  */
 501                 if (!armv6_pmcr_counter_has_overflowed(pmcr, idx))
 502                         continue;
 503
 504                 hwc = &event->hw;
 505                 armpmu_event_update(event, hwc, idx, 1);
 506                 data.period = event->hw.last_period;
 507                 if (!armpmu_event_set_period(event, hwc, idx))
 508                         continue;
 509
 510                 if (perf_event_overflow(event, &data, regs))
 511                         armpmu->disable(hwc, idx);
 512         }
 513
 514         /*
 515          * Handle the pending perf events.
 516          *
 517          * Note: this call *must* be run with interrupts disabled. For
 518          * platforms that can have the PMU interrupts raised as an NMI, this
 519          * will not work.
 520          */
 521         irq_work_run();
 522
 523         return IRQ_HANDLED;
 524 }
 525
 526 static void
 527 armv6pmu_start(void)
 528 {
 529         unsigned long flags, val;
 530
 531         raw_spin_lock_irqsave(&pmu_lock, flags);
 532         val = armv6_pmcr_read();
 533         val |= ARMV6_PMCR_ENABLE;
 534         armv6_pmcr_write(val);
 535         raw_spin_unlock_irqrestore(&pmu_lock, flags);
 536 }
 537
 538 static void
 539 armv6pmu_stop(void)
 540 {
 541         unsigned long flags, val;
 542
 543         raw_spin_lock_irqsave(&pmu_lock, flags);
 544         val = armv6_pmcr_read();
 545         val &= ~ARMV6_PMCR_ENABLE;
 546         armv6_pmcr_write(val);
 547         raw_spin_unlock_irqrestore(&pmu_lock, flags);
 548 }
 549
 550 static int
 551 armv6pmu_get_event_idx(struct cpu_hw_events *cpuc,
 552                        struct hw_perf_event *event)
 553 {
 554         /* Always place a cycle counter into the cycle counter. */
 555         if (ARMV6_PERFCTR_CPU_CYCLES == event->config_base) {
 556                 if (test_and_set_bit(ARMV6_CYCLE_COUNTER, cpuc->used_mask))
 557                         return -EAGAIN;
 558
 559                 return ARMV6_CYCLE_COUNTER;
 560         } else {
 561                 /*
 562                  * For anything other than a cycle counter, try and use
 563                  * counter0 and counter1.
 564                  */
 565                 if (!test_and_set_bit(ARMV6_COUNTER1, cpuc->used_mask))
 566                         return ARMV6_COUNTER1;
 567
 568                 if (!test_and_set_bit(ARMV6_COUNTER0, cpuc->used_mask))
 569                         return ARMV6_COUNTER0;
 570
 571                 /* The counters are all in use. */
 572                 return -EAGAIN;
 573         }
 574 }
 575
 576 static void
 577 armv6pmu_disable_event(struct hw_perf_event *hwc,
 578                        int idx)
 579 {
 580         unsigned long val, mask, evt, flags;
 581
 582         if (ARMV6_CYCLE_COUNTER == idx) {
 583                 mask    = ARMV6_PMCR_CCOUNT_IEN;
 584                 evt     = 0;
 585         } else if (ARMV6_COUNTER0 == idx) {
 586                 mask    = ARMV6_PMCR_COUNT0_IEN | ARMV6_PMCR_EVT_COUNT0_MASK;
 587                 evt     = ARMV6_PERFCTR_NOP << ARMV6_PMCR_EVT_COUNT0_SHIFT;
 588         } else if (ARMV6_COUNTER1 == idx) {
 589                 mask    = ARMV6_PMCR_COUNT1_IEN | ARMV6_PMCR_EVT_COUNT1_MASK;
 590                 evt     = ARMV6_PERFCTR_NOP << ARMV6_PMCR_EVT_COUNT1_SHIFT;
 591         } else {
 592                 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
 593                 return;
 594         }
 595
 596         /*
 597          * Mask out the current event and set the counter to count the number
 598          * of ETM bus signal assertion cycles. The external reporting should
 599          * be disabled and so this should never increment.
 600          */
 601         raw_spin_lock_irqsave(&pmu_lock, flags);
 602         val = armv6_pmcr_read();
 603         val &= ~mask;
 604         val |= evt;
 605         armv6_pmcr_write(val);
 606         raw_spin_unlock_irqrestore(&pmu_lock, flags);
 607 }
 608
 609 static void
 610 armv6mpcore_pmu_disable_event(struct hw_perf_event *hwc,
 611                               int idx)
 612 {
 613         unsigned long val, mask, flags, evt = 0;
 614
 615         if (ARMV6_CYCLE_COUNTER == idx) {
 616                 mask    = ARMV6_PMCR_CCOUNT_IEN;
 617         } else if (ARMV6_COUNTER0 == idx) {
 618                 mask    = ARMV6_PMCR_COUNT0_IEN;
 619         } else if (ARMV6_COUNTER1 == idx) {
 620                 mask    = ARMV6_PMCR_COUNT1_IEN;
 621         } else {
 622                 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
 623                 return;
 624         }
 625
 626         /*
 627          * Unlike UP ARMv6, we don't have a way of stopping the counters. We
 628          * simply disable the interrupt reporting.
 629          */
 630         raw_spin_lock_irqsave(&pmu_lock, flags);
 631         val = armv6_pmcr_read();
 632         val &= ~mask;
 633         val |= evt;
 634         armv6_pmcr_write(val);
 635         raw_spin_unlock_irqrestore(&pmu_lock, flags);
 636 }
 637
 638 static const struct arm_pmu armv6pmu = {
 639         .id                     = ARM_PERF_PMU_ID_V6,
 640         .name                   = "v6",
 641         .handle_irq             = armv6pmu_handle_irq,
 642         .enable                 = armv6pmu_enable_event,
 643         .disable                = armv6pmu_disable_event,
 644         .read_counter           = armv6pmu_read_counter,
 645         .write_counter          = armv6pmu_write_counter,
 646         .get_event_idx          = armv6pmu_get_event_idx,
 647         .start                  = armv6pmu_start,
 648         .stop                   = armv6pmu_stop,
 649         .cache_map              = &armv6_perf_cache_map,
 650         .event_map              = &armv6_perf_map,
 651         .raw_event_mask         = 0xFF,
 652         .num_events             = 3,
 653         .max_period             = (1LLU << 32) - 1,
 654 };
 655
 656 static const struct arm_pmu *__init armv6pmu_init(void)
 657 {
 658         return &armv6pmu;
 659 }
 660
 661 /*
 662  * ARMv6mpcore is almost identical to single core ARMv6 with the exception
 663  * that some of the events have different enumerations and that there is no
 664  * *hack* to stop the programmable counters. To stop the counters we simply
 665  * disable the interrupt reporting and update the event. When unthrottling we
 666  * reset the period and enable the interrupt reporting.
 667  */
 668 static const struct arm_pmu armv6mpcore_pmu = {
 669         .id                     = ARM_PERF_PMU_ID_V6MP,
 670         .name                   = "v6mpcore",
 671         .handle_irq             = armv6pmu_handle_irq,
 672         .enable                 = armv6pmu_enable_event,
 673         .disable                = armv6mpcore_pmu_disable_event,
 674         .read_counter           = armv6pmu_read_counter,
 675         .write_counter          = armv6pmu_write_counter,
 676         .get_event_idx          = armv6pmu_get_event_idx,
 677         .start                  = armv6pmu_start,
 678         .stop                   = armv6pmu_stop,
 679         .cache_map              = &armv6mpcore_perf_cache_map,
 680         .event_map              = &armv6mpcore_perf_map,
 681         .raw_event_mask         = 0xFF,
 682         .num_events             = 3,
 683         .max_period             = (1LLU << 32) - 1,
 684 };
 685
 686 static const struct arm_pmu *__init armv6mpcore_pmu_init(void)
 687 {
 688         return &armv6mpcore_pmu;
 689 }
 690 #else
 691 static const struct arm_pmu *__init armv6pmu_init(void)
 692 {
 693         return NULL;
 694 }
 695
 696 static const struct arm_pmu *__init armv6mpcore_pmu_init(void)
 697 {
 698         return NULL;
 699 }
 700 #endif  /* CONFIG_CPU_V6 || CONFIG_CPU_V6K */