arch/arm/kernel/perf_event_xscale.c

   1 /*
   2  * ARMv5 [xscale] Performance counter handling code.
   3  *
   4  * Copyright (C) 2010, ARM Ltd., Will Deacon <will.deacon@arm.com>
   5  *
   6  * Based on the previous xscale OProfile code.
   7  *
   8  * There are two variants of the xscale PMU that we support:
   9  *      - xscale1pmu: 2 event counters and a cycle counter
  10  *      - xscale2pmu: 4 event counters and a cycle counter
  11  * The two variants share event definitions, but have different
  12  * PMU structures.
  13  */
  14
  15 #ifdef CONFIG_CPU_XSCALE
  16 enum xscale_perf_types {
  17         XSCALE_PERFCTR_ICACHE_MISS              = 0x00,
  18         XSCALE_PERFCTR_ICACHE_NO_DELIVER        = 0x01,
  19         XSCALE_PERFCTR_DATA_STALL               = 0x02,
  20         XSCALE_PERFCTR_ITLB_MISS                = 0x03,
  21         XSCALE_PERFCTR_DTLB_MISS                = 0x04,
  22         XSCALE_PERFCTR_BRANCH                   = 0x05,
  23         XSCALE_PERFCTR_BRANCH_MISS              = 0x06,
  24         XSCALE_PERFCTR_INSTRUCTION              = 0x07,
  25         XSCALE_PERFCTR_DCACHE_FULL_STALL        = 0x08,
  26         XSCALE_PERFCTR_DCACHE_FULL_STALL_CONTIG = 0x09,
  27         XSCALE_PERFCTR_DCACHE_ACCESS            = 0x0A,
  28         XSCALE_PERFCTR_DCACHE_MISS              = 0x0B,
  29         XSCALE_PERFCTR_DCACHE_WRITE_BACK        = 0x0C,
  30         XSCALE_PERFCTR_PC_CHANGED               = 0x0D,
  31         XSCALE_PERFCTR_BCU_REQUEST              = 0x10,
  32         XSCALE_PERFCTR_BCU_FULL                 = 0x11,
  33         XSCALE_PERFCTR_BCU_DRAIN                = 0x12,
  34         XSCALE_PERFCTR_BCU_ECC_NO_ELOG          = 0x14,
  35         XSCALE_PERFCTR_BCU_1_BIT_ERR            = 0x15,
  36         XSCALE_PERFCTR_RMW                      = 0x16,
  37         /* XSCALE_PERFCTR_CCNT is not hardware defined */
  38         XSCALE_PERFCTR_CCNT                     = 0xFE,
  39         XSCALE_PERFCTR_UNUSED                   = 0xFF,
  40 };
  41
  42 enum xscale_counters {
  43         XSCALE_CYCLE_COUNTER    = 0,
  44         XSCALE_COUNTER0,
  45         XSCALE_COUNTER1,
  46         XSCALE_COUNTER2,
  47         XSCALE_COUNTER3,
  48 };
  49
  50 static const unsigned xscale_perf_map[PERF_COUNT_HW_MAX] = {
  51         [PERF_COUNT_HW_CPU_CYCLES]              = XSCALE_PERFCTR_CCNT,
  52         [PERF_COUNT_HW_INSTRUCTIONS]            = XSCALE_PERFCTR_INSTRUCTION,
  53         [PERF_COUNT_HW_CACHE_REFERENCES]        = HW_OP_UNSUPPORTED,
  54         [PERF_COUNT_HW_CACHE_MISSES]            = HW_OP_UNSUPPORTED,
  55         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS]     = XSCALE_PERFCTR_BRANCH,
  56         [PERF_COUNT_HW_BRANCH_MISSES]           = XSCALE_PERFCTR_BRANCH_MISS,
  57         [PERF_COUNT_HW_BUS_CYCLES]              = HW_OP_UNSUPPORTED,
  58         [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = XSCALE_PERFCTR_ICACHE_NO_DELIVER,
  59         [PERF_COUNT_HW_STALLED_CYCLES_BACKEND]  = HW_OP_UNSUPPORTED,
  60 };
  61
  62 static const unsigned xscale_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
  63                                            [PERF_COUNT_HW_CACHE_OP_MAX]
  64                                            [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
  65         [C(L1D)] = {
  66                 [C(OP_READ)] = {
  67                         [C(RESULT_ACCESS)]      = XSCALE_PERFCTR_DCACHE_ACCESS,
  68                         [C(RESULT_MISS)]        = XSCALE_PERFCTR_DCACHE_MISS,
  69                 },
  70                 [C(OP_WRITE)] = {
  71                         [C(RESULT_ACCESS)]      = XSCALE_PERFCTR_DCACHE_ACCESS,
  72                         [C(RESULT_MISS)]        = XSCALE_PERFCTR_DCACHE_MISS,
  73                 },
  74                 [C(OP_PREFETCH)] = {
  75                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
  76                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
  77                 },
  78         },
  79         [C(L1I)] = {
  80                 [C(OP_READ)] = {
  81                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
  82                         [C(RESULT_MISS)]        = XSCALE_PERFCTR_ICACHE_MISS,
  83                 },
  84                 [C(OP_WRITE)] = {
  85                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
  86                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
  87                 },
  88                 [C(OP_PREFETCH)] = {
  89                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
  90                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
  91                 },
  92         },
  93         [C(LL)] = {
  94                 [C(OP_READ)] = {
  95                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
  96                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
  97                 },
  98                 [C(OP_WRITE)] = {
  99                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 100                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 101                 },
 102                 [C(OP_PREFETCH)] = {
 103                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 104                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 105                 },
 106         },
 107         [C(DTLB)] = {
 108                 [C(OP_READ)] = {
 109                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 110                         [C(RESULT_MISS)]        = XSCALE_PERFCTR_DTLB_MISS,
 111                 },
 112                 [C(OP_WRITE)] = {
 113                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 114                         [C(RESULT_MISS)]        = XSCALE_PERFCTR_DTLB_MISS,
 115                 },
 116                 [C(OP_PREFETCH)] = {
 117                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 118                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 119                 },
 120         },
 121         [C(ITLB)] = {
 122                 [C(OP_READ)] = {
 123                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 124                         [C(RESULT_MISS)]        = XSCALE_PERFCTR_ITLB_MISS,
 125                 },
 126                 [C(OP_WRITE)] = {
 127                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 128                         [C(RESULT_MISS)]        = XSCALE_PERFCTR_ITLB_MISS,
 129                 },
 130                 [C(OP_PREFETCH)] = {
 131                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 132                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 133                 },
 134         },
 135         [C(BPU)] = {
 136                 [C(OP_READ)] = {
 137                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 138                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 139                 },
 140                 [C(OP_WRITE)] = {
 141                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 142                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 143                 },
 144                 [C(OP_PREFETCH)] = {
 145                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 146                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 147                 },
 148         },
 149         [C(NODE)] = {
 150                 [C(OP_READ)] = {
 151                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 152                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 153                 },
 154                 [C(OP_WRITE)] = {
 155                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 156                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 157                 },
 158                 [C(OP_PREFETCH)] = {
 159                         [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
 160                         [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
 161                 },
 162         },
 163 };
 164
 165 #define XSCALE_PMU_ENABLE       0x001
 166 #define XSCALE_PMN_RESET        0x002
 167 #define XSCALE_CCNT_RESET       0x004
 168 #define XSCALE_PMU_RESET        (CCNT_RESET | PMN_RESET)
 169 #define XSCALE_PMU_CNT64        0x008
 170
 171 #define XSCALE1_OVERFLOWED_MASK 0x700
 172 #define XSCALE1_CCOUNT_OVERFLOW 0x400
 173 #define XSCALE1_COUNT0_OVERFLOW 0x100
 174 #define XSCALE1_COUNT1_OVERFLOW 0x200
 175 #define XSCALE1_CCOUNT_INT_EN   0x040
 176 #define XSCALE1_COUNT0_INT_EN   0x010
 177 #define XSCALE1_COUNT1_INT_EN   0x020
 178 #define XSCALE1_COUNT0_EVT_SHFT 12
 179 #define XSCALE1_COUNT0_EVT_MASK (0xff << XSCALE1_COUNT0_EVT_SHFT)
 180 #define XSCALE1_COUNT1_EVT_SHFT 20
 181 #define XSCALE1_COUNT1_EVT_MASK (0xff << XSCALE1_COUNT1_EVT_SHFT)
 182
 183 static inline u32
 184 xscale1pmu_read_pmnc(void)
 185 {
 186         u32 val;
 187         asm volatile("mrc p14, 0, %0, c0, c0, 0" : "=r" (val));
 188         return val;
 189 }
 190
 191 static inline void
 192 xscale1pmu_write_pmnc(u32 val)
 193 {
 194         /* upper 4bits and 7, 11 are write-as-0 */
 195         val &= 0xffff77f;
 196         asm volatile("mcr p14, 0, %0, c0, c0, 0" : : "r" (val));
 197 }
 198
 199 static inline int
 200 xscale1_pmnc_counter_has_overflowed(unsigned long pmnc,
 201                                         enum xscale_counters counter)
 202 {
 203         int ret = 0;
 204
 205         switch (counter) {
 206         case XSCALE_CYCLE_COUNTER:
 207                 ret = pmnc & XSCALE1_CCOUNT_OVERFLOW;
 208                 break;
 209         case XSCALE_COUNTER0:
 210                 ret = pmnc & XSCALE1_COUNT0_OVERFLOW;
 211                 break;
 212         case XSCALE_COUNTER1:
 213                 ret = pmnc & XSCALE1_COUNT1_OVERFLOW;
 214                 break;
 215         default:
 216                 WARN_ONCE(1, "invalid counter number (%d)\n", counter);
 217         }
 218
 219         return ret;
 220 }
 221
 222 static irqreturn_t
 223 xscale1pmu_handle_irq(int irq_num, void *dev)
 224 {
 225         unsigned long pmnc;
 226         struct perf_sample_data data;
 227         struct pmu_hw_events *cpuc;
 228         struct pt_regs *regs;
 229         int idx;
 230
 231         /*
 232          * NOTE: there's an A stepping erratum that states if an overflow
 233          *       bit already exists and another occurs, the previous
 234          *       Overflow bit gets cleared. There's no workaround.
 235          *       Fixed in B stepping or later.
 236          */
 237         pmnc = xscale1pmu_read_pmnc();
 238
 239         /*
 240          * Write the value back to clear the overflow flags. Overflow
 241          * flags remain in pmnc for use below. We also disable the PMU
 242          * while we process the interrupt.
 243          */
 244         xscale1pmu_write_pmnc(pmnc & ~XSCALE_PMU_ENABLE);
 245
 246         if (!(pmnc & XSCALE1_OVERFLOWED_MASK))
 247                 return IRQ_NONE;
 248
 249         regs = get_irq_regs();
 250
 251         perf_sample_data_init(&data, 0);
 252
 253         cpuc = &__get_cpu_var(cpu_hw_events);
 254         for (idx = 0; idx < cpu_pmu->num_events; ++idx) {
 255                 struct perf_event *event = cpuc->events[idx];
 256                 struct hw_perf_event *hwc;
 257
 258                 if (!event)
 259                         continue;
 260
 261                 if (!xscale1_pmnc_counter_has_overflowed(pmnc, idx))
 262                         continue;
 263
 264                 hwc = &event->hw;
 265                 armpmu_event_update(event, hwc, idx);
 266                 data.period = event->hw.last_period;
 267                 if (!armpmu_event_set_period(event, hwc, idx))
 268                         continue;
 269
 270                 if (perf_event_overflow(event, &data, regs))
 271                         cpu_pmu->disable(hwc, idx);
 272         }
 273
 274         irq_work_run();
 275
 276         /*
 277          * Re-enable the PMU.
 278          */
 279         pmnc = xscale1pmu_read_pmnc() | XSCALE_PMU_ENABLE;
 280         xscale1pmu_write_pmnc(pmnc);
 281
 282         return IRQ_HANDLED;
 283 }
 284
 285 static void
 286 xscale1pmu_enable_event(struct hw_perf_event *hwc, int idx)
 287 {
 288         unsigned long val, mask, evt, flags;
 289         struct pmu_hw_events *events = cpu_pmu->get_hw_events();
 290
 291         switch (idx) {
 292         case XSCALE_CYCLE_COUNTER:
 293                 mask = 0;
 294                 evt = XSCALE1_CCOUNT_INT_EN;
 295                 break;
 296         case XSCALE_COUNTER0:
 297                 mask = XSCALE1_COUNT0_EVT_MASK;
 298                 evt = (hwc->config_base << XSCALE1_COUNT0_EVT_SHFT) |
 299                         XSCALE1_COUNT0_INT_EN;
 300                 break;
 301         case XSCALE_COUNTER1:
 302                 mask = XSCALE1_COUNT1_EVT_MASK;
 303                 evt = (hwc->config_base << XSCALE1_COUNT1_EVT_SHFT) |
 304                         XSCALE1_COUNT1_INT_EN;
 305                 break;
 306         default:
 307                 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
 308                 return;
 309         }
 310
 311         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 312         val = xscale1pmu_read_pmnc();
 313         val &= ~mask;
 314         val |= evt;
 315         xscale1pmu_write_pmnc(val);
 316         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 317 }
 318
 319 static void
 320 xscale1pmu_disable_event(struct hw_perf_event *hwc, int idx)
 321 {
 322         unsigned long val, mask, evt, flags;
 323         struct pmu_hw_events *events = cpu_pmu->get_hw_events();
 324
 325         switch (idx) {
 326         case XSCALE_CYCLE_COUNTER:
 327                 mask = XSCALE1_CCOUNT_INT_EN;
 328                 evt = 0;
 329                 break;
 330         case XSCALE_COUNTER0:
 331                 mask = XSCALE1_COUNT0_INT_EN | XSCALE1_COUNT0_EVT_MASK;
 332                 evt = XSCALE_PERFCTR_UNUSED << XSCALE1_COUNT0_EVT_SHFT;
 333                 break;
 334         case XSCALE_COUNTER1:
 335                 mask = XSCALE1_COUNT1_INT_EN | XSCALE1_COUNT1_EVT_MASK;
 336                 evt = XSCALE_PERFCTR_UNUSED << XSCALE1_COUNT1_EVT_SHFT;
 337                 break;
 338         default:
 339                 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
 340                 return;
 341         }
 342
 343         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 344         val = xscale1pmu_read_pmnc();
 345         val &= ~mask;
 346         val |= evt;
 347         xscale1pmu_write_pmnc(val);
 348         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 349 }
 350
 351 static int
 352 xscale1pmu_get_event_idx(struct pmu_hw_events *cpuc,
 353                         struct hw_perf_event *event)
 354 {
 355         if (XSCALE_PERFCTR_CCNT == event->config_base) {
 356                 if (test_and_set_bit(XSCALE_CYCLE_COUNTER, cpuc->used_mask))
 357                         return -EAGAIN;
 358
 359                 return XSCALE_CYCLE_COUNTER;
 360         } else {
 361                 if (!test_and_set_bit(XSCALE_COUNTER1, cpuc->used_mask))
 362                         return XSCALE_COUNTER1;
 363
 364                 if (!test_and_set_bit(XSCALE_COUNTER0, cpuc->used_mask))
 365                         return XSCALE_COUNTER0;
 366
 367                 return -EAGAIN;
 368         }
 369 }
 370
 371 static void
 372 xscale1pmu_start(void)
 373 {
 374         unsigned long flags, val;
 375         struct pmu_hw_events *events = cpu_pmu->get_hw_events();
 376
 377         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 378         val = xscale1pmu_read_pmnc();
 379         val |= XSCALE_PMU_ENABLE;
 380         xscale1pmu_write_pmnc(val);
 381         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 382 }
 383
 384 static void
 385 xscale1pmu_stop(void)
 386 {
 387         unsigned long flags, val;
 388         struct pmu_hw_events *events = cpu_pmu->get_hw_events();
 389
 390         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 391         val = xscale1pmu_read_pmnc();
 392         val &= ~XSCALE_PMU_ENABLE;
 393         xscale1pmu_write_pmnc(val);
 394         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 395 }
 396
 397 static inline u32
 398 xscale1pmu_read_counter(int counter)
 399 {
 400         u32 val = 0;
 401
 402         switch (counter) {
 403         case XSCALE_CYCLE_COUNTER:
 404                 asm volatile("mrc p14, 0, %0, c1, c0, 0" : "=r" (val));
 405                 break;
 406         case XSCALE_COUNTER0:
 407                 asm volatile("mrc p14, 0, %0, c2, c0, 0" : "=r" (val));
 408                 break;
 409         case XSCALE_COUNTER1:
 410                 asm volatile("mrc p14, 0, %0, c3, c0, 0" : "=r" (val));
 411                 break;
 412         }
 413
 414         return val;
 415 }
 416
 417 static inline void
 418 xscale1pmu_write_counter(int counter, u32 val)
 419 {
 420         switch (counter) {
 421         case XSCALE_CYCLE_COUNTER:
 422                 asm volatile("mcr p14, 0, %0, c1, c0, 0" : : "r" (val));
 423                 break;
 424         case XSCALE_COUNTER0:
 425                 asm volatile("mcr p14, 0, %0, c2, c0, 0" : : "r" (val));
 426                 break;
 427         case XSCALE_COUNTER1:
 428                 asm volatile("mcr p14, 0, %0, c3, c0, 0" : : "r" (val));
 429                 break;
 430         }
 431 }
 432
 433 static int xscale_map_event(struct perf_event *event)
 434 {
 435         return map_cpu_event(event, &xscale_perf_map,
 436                                 &xscale_perf_cache_map, 0xFF);
 437 }
 438
 439 static struct arm_pmu xscale1pmu = {
 440         .id             = ARM_PERF_PMU_ID_XSCALE1,
 441         .name           = "xscale1",
 442         .handle_irq     = xscale1pmu_handle_irq,
 443         .enable         = xscale1pmu_enable_event,
 444         .disable        = xscale1pmu_disable_event,
 445         .read_counter   = xscale1pmu_read_counter,
 446         .write_counter  = xscale1pmu_write_counter,
 447         .get_event_idx  = xscale1pmu_get_event_idx,
 448         .start          = xscale1pmu_start,
 449         .stop           = xscale1pmu_stop,
 450         .map_event      = xscale_map_event,
 451         .num_events     = 3,
 452         .max_period     = (1LLU << 32) - 1,
 453 };
 454
 455 static struct arm_pmu *__init xscale1pmu_init(void)
 456 {
 457         return &xscale1pmu;
 458 }
 459
 460 #define XSCALE2_OVERFLOWED_MASK 0x01f
 461 #define XSCALE2_CCOUNT_OVERFLOW 0x001
 462 #define XSCALE2_COUNT0_OVERFLOW 0x002
 463 #define XSCALE2_COUNT1_OVERFLOW 0x004
 464 #define XSCALE2_COUNT2_OVERFLOW 0x008
 465 #define XSCALE2_COUNT3_OVERFLOW 0x010
 466 #define XSCALE2_CCOUNT_INT_EN   0x001
 467 #define XSCALE2_COUNT0_INT_EN   0x002
 468 #define XSCALE2_COUNT1_INT_EN   0x004
 469 #define XSCALE2_COUNT2_INT_EN   0x008
 470 #define XSCALE2_COUNT3_INT_EN   0x010
 471 #define XSCALE2_COUNT0_EVT_SHFT 0
 472 #define XSCALE2_COUNT0_EVT_MASK (0xff << XSCALE2_COUNT0_EVT_SHFT)
 473 #define XSCALE2_COUNT1_EVT_SHFT 8
 474 #define XSCALE2_COUNT1_EVT_MASK (0xff << XSCALE2_COUNT1_EVT_SHFT)
 475 #define XSCALE2_COUNT2_EVT_SHFT 16
 476 #define XSCALE2_COUNT2_EVT_MASK (0xff << XSCALE2_COUNT2_EVT_SHFT)
 477 #define XSCALE2_COUNT3_EVT_SHFT 24
 478 #define XSCALE2_COUNT3_EVT_MASK (0xff << XSCALE2_COUNT3_EVT_SHFT)
 479
 480 static inline u32
 481 xscale2pmu_read_pmnc(void)
 482 {
 483         u32 val;
 484         asm volatile("mrc p14, 0, %0, c0, c1, 0" : "=r" (val));
 485         /* bits 1-2 and 4-23 are read-unpredictable */
 486         return val & 0xff000009;
 487 }
 488
 489 static inline void
 490 xscale2pmu_write_pmnc(u32 val)
 491 {
 492         /* bits 4-23 are write-as-0, 24-31 are write ignored */
 493         val &= 0xf;
 494         asm volatile("mcr p14, 0, %0, c0, c1, 0" : : "r" (val));
 495 }
 496
 497 static inline u32
 498 xscale2pmu_read_overflow_flags(void)
 499 {
 500         u32 val;
 501         asm volatile("mrc p14, 0, %0, c5, c1, 0" : "=r" (val));
 502         return val;
 503 }
 504
 505 static inline void
 506 xscale2pmu_write_overflow_flags(u32 val)
 507 {
 508         asm volatile("mcr p14, 0, %0, c5, c1, 0" : : "r" (val));
 509 }
 510
 511 static inline u32
 512 xscale2pmu_read_event_select(void)
 513 {
 514         u32 val;
 515         asm volatile("mrc p14, 0, %0, c8, c1, 0" : "=r" (val));
 516         return val;
 517 }
 518
 519 static inline void
 520 xscale2pmu_write_event_select(u32 val)
 521 {
 522         asm volatile("mcr p14, 0, %0, c8, c1, 0" : : "r"(val));
 523 }
 524
 525 static inline u32
 526 xscale2pmu_read_int_enable(void)
 527 {
 528         u32 val;
 529         asm volatile("mrc p14, 0, %0, c4, c1, 0" : "=r" (val));
 530         return val;
 531 }
 532
 533 static void
 534 xscale2pmu_write_int_enable(u32 val)
 535 {
 536         asm volatile("mcr p14, 0, %0, c4, c1, 0" : : "r" (val));
 537 }
 538
 539 static inline int
 540 xscale2_pmnc_counter_has_overflowed(unsigned long of_flags,
 541                                         enum xscale_counters counter)
 542 {
 543         int ret = 0;
 544
 545         switch (counter) {
 546         case XSCALE_CYCLE_COUNTER:
 547                 ret = of_flags & XSCALE2_CCOUNT_OVERFLOW;
 548                 break;
 549         case XSCALE_COUNTER0:
 550                 ret = of_flags & XSCALE2_COUNT0_OVERFLOW;
 551                 break;
 552         case XSCALE_COUNTER1:
 553                 ret = of_flags & XSCALE2_COUNT1_OVERFLOW;
 554                 break;
 555         case XSCALE_COUNTER2:
 556                 ret = of_flags & XSCALE2_COUNT2_OVERFLOW;
 557                 break;
 558         case XSCALE_COUNTER3:
 559                 ret = of_flags & XSCALE2_COUNT3_OVERFLOW;
 560                 break;
 561         default:
 562                 WARN_ONCE(1, "invalid counter number (%d)\n", counter);
 563         }
 564
 565         return ret;
 566 }
 567
 568 static irqreturn_t
 569 xscale2pmu_handle_irq(int irq_num, void *dev)
 570 {
 571         unsigned long pmnc, of_flags;
 572         struct perf_sample_data data;
 573         struct pmu_hw_events *cpuc;
 574         struct pt_regs *regs;
 575         int idx;
 576
 577         /* Disable the PMU. */
 578         pmnc = xscale2pmu_read_pmnc();
 579         xscale2pmu_write_pmnc(pmnc & ~XSCALE_PMU_ENABLE);
 580
 581         /* Check the overflow flag register. */
 582         of_flags = xscale2pmu_read_overflow_flags();
 583         if (!(of_flags & XSCALE2_OVERFLOWED_MASK))
 584                 return IRQ_NONE;
 585
 586         /* Clear the overflow bits. */
 587         xscale2pmu_write_overflow_flags(of_flags);
 588
 589         regs = get_irq_regs();
 590
 591         perf_sample_data_init(&data, 0);
 592
 593         cpuc = &__get_cpu_var(cpu_hw_events);
 594         for (idx = 0; idx < cpu_pmu->num_events; ++idx) {
 595                 struct perf_event *event = cpuc->events[idx];
 596                 struct hw_perf_event *hwc;
 597
 598                 if (!event)
 599                         continue;
 600
 601                 if (!xscale2_pmnc_counter_has_overflowed(of_flags, idx))
 602                         continue;
 603
 604                 hwc = &event->hw;
 605                 armpmu_event_update(event, hwc, idx);
 606                 data.period = event->hw.last_period;
 607                 if (!armpmu_event_set_period(event, hwc, idx))
 608                         continue;
 609
 610                 if (perf_event_overflow(event, &data, regs))
 611                         cpu_pmu->disable(hwc, idx);
 612         }
 613
 614         irq_work_run();
 615
 616         /*
 617          * Re-enable the PMU.
 618          */
 619         pmnc = xscale2pmu_read_pmnc() | XSCALE_PMU_ENABLE;
 620         xscale2pmu_write_pmnc(pmnc);
 621
 622         return IRQ_HANDLED;
 623 }
 624
 625 static void
 626 xscale2pmu_enable_event(struct hw_perf_event *hwc, int idx)
 627 {
 628         unsigned long flags, ien, evtsel;
 629         struct pmu_hw_events *events = cpu_pmu->get_hw_events();
 630
 631         ien = xscale2pmu_read_int_enable();
 632         evtsel = xscale2pmu_read_event_select();
 633
 634         switch (idx) {
 635         case XSCALE_CYCLE_COUNTER:
 636                 ien |= XSCALE2_CCOUNT_INT_EN;
 637                 break;
 638         case XSCALE_COUNTER0:
 639                 ien |= XSCALE2_COUNT0_INT_EN;
 640                 evtsel &= ~XSCALE2_COUNT0_EVT_MASK;
 641                 evtsel |= hwc->config_base << XSCALE2_COUNT0_EVT_SHFT;
 642                 break;
 643         case XSCALE_COUNTER1:
 644                 ien |= XSCALE2_COUNT1_INT_EN;
 645                 evtsel &= ~XSCALE2_COUNT1_EVT_MASK;
 646                 evtsel |= hwc->config_base << XSCALE2_COUNT1_EVT_SHFT;
 647                 break;
 648         case XSCALE_COUNTER2:
 649                 ien |= XSCALE2_COUNT2_INT_EN;
 650                 evtsel &= ~XSCALE2_COUNT2_EVT_MASK;
 651                 evtsel |= hwc->config_base << XSCALE2_COUNT2_EVT_SHFT;
 652                 break;
 653         case XSCALE_COUNTER3:
 654                 ien |= XSCALE2_COUNT3_INT_EN;
 655                 evtsel &= ~XSCALE2_COUNT3_EVT_MASK;
 656                 evtsel |= hwc->config_base << XSCALE2_COUNT3_EVT_SHFT;
 657                 break;
 658         default:
 659                 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
 660                 return;
 661         }
 662
 663         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 664         xscale2pmu_write_event_select(evtsel);
 665         xscale2pmu_write_int_enable(ien);
 666         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 667 }
 668
 669 static void
 670 xscale2pmu_disable_event(struct hw_perf_event *hwc, int idx)
 671 {
 672         unsigned long flags, ien, evtsel, of_flags;
 673         struct pmu_hw_events *events = cpu_pmu->get_hw_events();
 674
 675         ien = xscale2pmu_read_int_enable();
 676         evtsel = xscale2pmu_read_event_select();
 677
 678         switch (idx) {
 679         case XSCALE_CYCLE_COUNTER:
 680                 ien &= ~XSCALE2_CCOUNT_INT_EN;
 681                 of_flags = XSCALE2_CCOUNT_OVERFLOW;
 682                 break;
 683         case XSCALE_COUNTER0:
 684                 ien &= ~XSCALE2_COUNT0_INT_EN;
 685                 evtsel &= ~XSCALE2_COUNT0_EVT_MASK;
 686                 evtsel |= XSCALE_PERFCTR_UNUSED << XSCALE2_COUNT0_EVT_SHFT;
 687                 of_flags = XSCALE2_COUNT0_OVERFLOW;
 688                 break;
 689         case XSCALE_COUNTER1:
 690                 ien &= ~XSCALE2_COUNT1_INT_EN;
 691                 evtsel &= ~XSCALE2_COUNT1_EVT_MASK;
 692                 evtsel |= XSCALE_PERFCTR_UNUSED << XSCALE2_COUNT1_EVT_SHFT;
 693                 of_flags = XSCALE2_COUNT1_OVERFLOW;
 694                 break;
 695         case XSCALE_COUNTER2:
 696                 ien &= ~XSCALE2_COUNT2_INT_EN;
 697                 evtsel &= ~XSCALE2_COUNT2_EVT_MASK;
 698                 evtsel |= XSCALE_PERFCTR_UNUSED << XSCALE2_COUNT2_EVT_SHFT;
 699                 of_flags = XSCALE2_COUNT2_OVERFLOW;
 700                 break;
 701         case XSCALE_COUNTER3:
 702                 ien &= ~XSCALE2_COUNT3_INT_EN;
 703                 evtsel &= ~XSCALE2_COUNT3_EVT_MASK;
 704                 evtsel |= XSCALE_PERFCTR_UNUSED << XSCALE2_COUNT3_EVT_SHFT;
 705                 of_flags = XSCALE2_COUNT3_OVERFLOW;
 706                 break;
 707         default:
 708                 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
 709                 return;
 710         }
 711
 712         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 713         xscale2pmu_write_event_select(evtsel);
 714         xscale2pmu_write_int_enable(ien);
 715         xscale2pmu_write_overflow_flags(of_flags);
 716         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 717 }
 718
 719 static int
 720 xscale2pmu_get_event_idx(struct pmu_hw_events *cpuc,
 721                         struct hw_perf_event *event)
 722 {
 723         int idx = xscale1pmu_get_event_idx(cpuc, event);
 724         if (idx >= 0)
 725                 goto out;
 726
 727         if (!test_and_set_bit(XSCALE_COUNTER3, cpuc->used_mask))
 728                 idx = XSCALE_COUNTER3;
 729         else if (!test_and_set_bit(XSCALE_COUNTER2, cpuc->used_mask))
 730                 idx = XSCALE_COUNTER2;
 731 out:
 732         return idx;
 733 }
 734
 735 static void
 736 xscale2pmu_start(void)
 737 {
 738         unsigned long flags, val;
 739         struct pmu_hw_events *events = cpu_pmu->get_hw_events();
 740
 741         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 742         val = xscale2pmu_read_pmnc() & ~XSCALE_PMU_CNT64;
 743         val |= XSCALE_PMU_ENABLE;
 744         xscale2pmu_write_pmnc(val);
 745         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 746 }
 747
 748 static void
 749 xscale2pmu_stop(void)
 750 {
 751         unsigned long flags, val;
 752         struct pmu_hw_events *events = cpu_pmu->get_hw_events();
 753
 754         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 755         val = xscale2pmu_read_pmnc();
 756         val &= ~XSCALE_PMU_ENABLE;
 757         xscale2pmu_write_pmnc(val);
 758         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 759 }
 760
 761 static inline u32
 762 xscale2pmu_read_counter(int counter)
 763 {
 764         u32 val = 0;
 765
 766         switch (counter) {
 767         case XSCALE_CYCLE_COUNTER:
 768                 asm volatile("mrc p14, 0, %0, c1, c1, 0" : "=r" (val));
 769                 break;
 770         case XSCALE_COUNTER0:
 771                 asm volatile("mrc p14, 0, %0, c0, c2, 0" : "=r" (val));
 772                 break;
 773         case XSCALE_COUNTER1:
 774                 asm volatile("mrc p14, 0, %0, c1, c2, 0" : "=r" (val));
 775                 break;
 776         case XSCALE_COUNTER2:
 777                 asm volatile("mrc p14, 0, %0, c2, c2, 0" : "=r" (val));
 778                 break;
 779         case XSCALE_COUNTER3:
 780                 asm volatile("mrc p14, 0, %0, c3, c2, 0" : "=r" (val));
 781                 break;
 782         }
 783
 784         return val;
 785 }
 786
 787 static inline void
 788 xscale2pmu_write_counter(int counter, u32 val)
 789 {
 790         switch (counter) {
 791         case XSCALE_CYCLE_COUNTER:
 792                 asm volatile("mcr p14, 0, %0, c1, c1, 0" : : "r" (val));
 793                 break;
 794         case XSCALE_COUNTER0:
 795                 asm volatile("mcr p14, 0, %0, c0, c2, 0" : : "r" (val));
 796                 break;
 797         case XSCALE_COUNTER1:
 798                 asm volatile("mcr p14, 0, %0, c1, c2, 0" : : "r" (val));
 799                 break;
 800         case XSCALE_COUNTER2:
 801                 asm volatile("mcr p14, 0, %0, c2, c2, 0" : : "r" (val));
 802                 break;
 803         case XSCALE_COUNTER3:
 804                 asm volatile("mcr p14, 0, %0, c3, c2, 0" : : "r" (val));
 805                 break;
 806         }
 807 }
 808
 809 static struct arm_pmu xscale2pmu = {
 810         .id             = ARM_PERF_PMU_ID_XSCALE2,
 811         .name           = "xscale2",
 812         .handle_irq     = xscale2pmu_handle_irq,
 813         .enable         = xscale2pmu_enable_event,
 814         .disable        = xscale2pmu_disable_event,
 815         .read_counter   = xscale2pmu_read_counter,
 816         .write_counter  = xscale2pmu_write_counter,
 817         .get_event_idx  = xscale2pmu_get_event_idx,
 818         .start          = xscale2pmu_start,
 819         .stop           = xscale2pmu_stop,
 820         .map_event      = xscale_map_event,
 821         .num_events     = 5,
 822         .max_period     = (1LLU << 32) - 1,
 823 };
 824
 825 static struct arm_pmu *__init xscale2pmu_init(void)
 826 {
 827         return &xscale2pmu;
 828 }
 829 #else
 830 static struct arm_pmu *__init xscale1pmu_init(void)
 831 {
 832         return NULL;
 833 }
 834
 835 static struct arm_pmu *__init xscale2pmu_init(void)
 836 {
 837         return NULL;
 838 }
 839 #endif  /* CONFIG_CPU_XSCALE */