arch/arm/kernel/perf_event_xscale.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * ARMv5 [xscale] Performance counter handling code.
   4  *
   5  * Copyright (C) 2010, ARM Ltd., Will Deacon <will.deacon@arm.com>
   6  *
   7  * Based on the previous xscale OProfile code.
   8  *
   9  * There are two variants of the xscale PMU that we support:
  10  *      - xscale1pmu: 2 event counters and a cycle counter
  11  *      - xscale2pmu: 4 event counters and a cycle counter
  12  * The two variants share event definitions, but have different
  13  * PMU structures.
  14  */
  15
  16 #ifdef CONFIG_CPU_XSCALE
  17
  18 #include <asm/cputype.h>
  19 #include <asm/irq_regs.h>
  20
  21 #include <linux/of.h>
  22 #include <linux/perf/arm_pmu.h>
  23 #include <linux/platform_device.h>
  24
  25 enum xscale_perf_types {
  26         XSCALE_PERFCTR_ICACHE_MISS              = 0x00,
  27         XSCALE_PERFCTR_ICACHE_NO_DELIVER        = 0x01,
  28         XSCALE_PERFCTR_DATA_STALL               = 0x02,
  29         XSCALE_PERFCTR_ITLB_MISS                = 0x03,
  30         XSCALE_PERFCTR_DTLB_MISS                = 0x04,
  31         XSCALE_PERFCTR_BRANCH                   = 0x05,
  32         XSCALE_PERFCTR_BRANCH_MISS              = 0x06,
  33         XSCALE_PERFCTR_INSTRUCTION              = 0x07,
  34         XSCALE_PERFCTR_DCACHE_FULL_STALL        = 0x08,
  35         XSCALE_PERFCTR_DCACHE_FULL_STALL_CONTIG = 0x09,
  36         XSCALE_PERFCTR_DCACHE_ACCESS            = 0x0A,
  37         XSCALE_PERFCTR_DCACHE_MISS              = 0x0B,
  38         XSCALE_PERFCTR_DCACHE_WRITE_BACK        = 0x0C,
  39         XSCALE_PERFCTR_PC_CHANGED               = 0x0D,
  40         XSCALE_PERFCTR_BCU_REQUEST              = 0x10,
  41         XSCALE_PERFCTR_BCU_FULL                 = 0x11,
  42         XSCALE_PERFCTR_BCU_DRAIN                = 0x12,
  43         XSCALE_PERFCTR_BCU_ECC_NO_ELOG          = 0x14,
  44         XSCALE_PERFCTR_BCU_1_BIT_ERR            = 0x15,
  45         XSCALE_PERFCTR_RMW                      = 0x16,
  46         /* XSCALE_PERFCTR_CCNT is not hardware defined */
  47         XSCALE_PERFCTR_CCNT                     = 0xFE,
  48         XSCALE_PERFCTR_UNUSED                   = 0xFF,
  49 };
  50
  51 enum xscale_counters {
  52         XSCALE_CYCLE_COUNTER    = 0,
  53         XSCALE_COUNTER0,
  54         XSCALE_COUNTER1,
  55         XSCALE_COUNTER2,
  56         XSCALE_COUNTER3,
  57 };
  58
  59 static const unsigned xscale_perf_map[PERF_COUNT_HW_MAX] = {
  60         PERF_MAP_ALL_UNSUPPORTED,
  61         [PERF_COUNT_HW_CPU_CYCLES]              = XSCALE_PERFCTR_CCNT,
  62         [PERF_COUNT_HW_INSTRUCTIONS]            = XSCALE_PERFCTR_INSTRUCTION,
  63         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS]     = XSCALE_PERFCTR_BRANCH,
  64         [PERF_COUNT_HW_BRANCH_MISSES]           = XSCALE_PERFCTR_BRANCH_MISS,
  65         [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = XSCALE_PERFCTR_ICACHE_NO_DELIVER,
  66 };
  67
  68 static const unsigned xscale_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
  69                                            [PERF_COUNT_HW_CACHE_OP_MAX]
  70                                            [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
  71         PERF_CACHE_MAP_ALL_UNSUPPORTED,
  72
  73         [C(L1D)][C(OP_READ)][C(RESULT_ACCESS)]  = XSCALE_PERFCTR_DCACHE_ACCESS,
  74         [C(L1D)][C(OP_READ)][C(RESULT_MISS)]    = XSCALE_PERFCTR_DCACHE_MISS,
  75         [C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = XSCALE_PERFCTR_DCACHE_ACCESS,
  76         [C(L1D)][C(OP_WRITE)][C(RESULT_MISS)]   = XSCALE_PERFCTR_DCACHE_MISS,
  77
  78         [C(L1I)][C(OP_READ)][C(RESULT_MISS)]    = XSCALE_PERFCTR_ICACHE_MISS,
  79
  80         [C(DTLB)][C(OP_READ)][C(RESULT_MISS)]   = XSCALE_PERFCTR_DTLB_MISS,
  81         [C(DTLB)][C(OP_WRITE)][C(RESULT_MISS)]  = XSCALE_PERFCTR_DTLB_MISS,
  82
  83         [C(ITLB)][C(OP_READ)][C(RESULT_MISS)]   = XSCALE_PERFCTR_ITLB_MISS,
  84         [C(ITLB)][C(OP_WRITE)][C(RESULT_MISS)]  = XSCALE_PERFCTR_ITLB_MISS,
  85 };
  86
  87 #define XSCALE_PMU_ENABLE       0x001
  88 #define XSCALE_PMN_RESET        0x002
  89 #define XSCALE_CCNT_RESET       0x004
  90 #define XSCALE_PMU_RESET        (CCNT_RESET | PMN_RESET)
  91 #define XSCALE_PMU_CNT64        0x008
  92
  93 #define XSCALE1_OVERFLOWED_MASK 0x700
  94 #define XSCALE1_CCOUNT_OVERFLOW 0x400
  95 #define XSCALE1_COUNT0_OVERFLOW 0x100
  96 #define XSCALE1_COUNT1_OVERFLOW 0x200
  97 #define XSCALE1_CCOUNT_INT_EN   0x040
  98 #define XSCALE1_COUNT0_INT_EN   0x010
  99 #define XSCALE1_COUNT1_INT_EN   0x020
 100 #define XSCALE1_COUNT0_EVT_SHFT 12
 101 #define XSCALE1_COUNT0_EVT_MASK (0xff << XSCALE1_COUNT0_EVT_SHFT)
 102 #define XSCALE1_COUNT1_EVT_SHFT 20
 103 #define XSCALE1_COUNT1_EVT_MASK (0xff << XSCALE1_COUNT1_EVT_SHFT)
 104
 105 static inline u32
 106 xscale1pmu_read_pmnc(void)
 107 {
 108         u32 val;
 109         asm volatile("mrc p14, 0, %0, c0, c0, 0" : "=r" (val));
 110         return val;
 111 }
 112
 113 static inline void
 114 xscale1pmu_write_pmnc(u32 val)
 115 {
 116         /* upper 4bits and 7, 11 are write-as-0 */
 117         val &= 0xffff77f;
 118         asm volatile("mcr p14, 0, %0, c0, c0, 0" : : "r" (val));
 119 }
 120
 121 static inline int
 122 xscale1_pmnc_counter_has_overflowed(unsigned long pmnc,
 123                                         enum xscale_counters counter)
 124 {
 125         int ret = 0;
 126
 127         switch (counter) {
 128         case XSCALE_CYCLE_COUNTER:
 129                 ret = pmnc & XSCALE1_CCOUNT_OVERFLOW;
 130                 break;
 131         case XSCALE_COUNTER0:
 132                 ret = pmnc & XSCALE1_COUNT0_OVERFLOW;
 133                 break;
 134         case XSCALE_COUNTER1:
 135                 ret = pmnc & XSCALE1_COUNT1_OVERFLOW;
 136                 break;
 137         default:
 138                 WARN_ONCE(1, "invalid counter number (%d)\n", counter);
 139         }
 140
 141         return ret;
 142 }
 143
 144 static irqreturn_t
 145 xscale1pmu_handle_irq(struct arm_pmu *cpu_pmu)
 146 {
 147         unsigned long pmnc;
 148         struct perf_sample_data data;
 149         struct pmu_hw_events *cpuc = this_cpu_ptr(cpu_pmu->hw_events);
 150         struct pt_regs *regs;
 151         int idx;
 152
 153         /*
 154          * NOTE: there's an A stepping erratum that states if an overflow
 155          *       bit already exists and another occurs, the previous
 156          *       Overflow bit gets cleared. There's no workaround.
 157          *       Fixed in B stepping or later.
 158          */
 159         pmnc = xscale1pmu_read_pmnc();
 160
 161         /*
 162          * Write the value back to clear the overflow flags. Overflow
 163          * flags remain in pmnc for use below. We also disable the PMU
 164          * while we process the interrupt.
 165          */
 166         xscale1pmu_write_pmnc(pmnc & ~XSCALE_PMU_ENABLE);
 167
 168         if (!(pmnc & XSCALE1_OVERFLOWED_MASK))
 169                 return IRQ_NONE;
 170
 171         regs = get_irq_regs();
 172
 173         for (idx = 0; idx < cpu_pmu->num_events; ++idx) {
 174                 struct perf_event *event = cpuc->events[idx];
 175                 struct hw_perf_event *hwc;
 176
 177                 if (!event)
 178                         continue;
 179
 180                 if (!xscale1_pmnc_counter_has_overflowed(pmnc, idx))
 181                         continue;
 182
 183                 hwc = &event->hw;
 184                 armpmu_event_update(event);
 185                 perf_sample_data_init(&data, 0, hwc->last_period);
 186                 if (!armpmu_event_set_period(event))
 187                         continue;
 188
 189                 if (perf_event_overflow(event, &data, regs))
 190                         cpu_pmu->disable(event);
 191         }
 192
 193         irq_work_run();
 194
 195         /*
 196          * Re-enable the PMU.
 197          */
 198         pmnc = xscale1pmu_read_pmnc() | XSCALE_PMU_ENABLE;
 199         xscale1pmu_write_pmnc(pmnc);
 200
 201         return IRQ_HANDLED;
 202 }
 203
 204 static void xscale1pmu_enable_event(struct perf_event *event)
 205 {
 206         unsigned long val, mask, evt, flags;
 207         struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
 208         struct hw_perf_event *hwc = &event->hw;
 209         struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
 210         int idx = hwc->idx;
 211
 212         switch (idx) {
 213         case XSCALE_CYCLE_COUNTER:
 214                 mask = 0;
 215                 evt = XSCALE1_CCOUNT_INT_EN;
 216                 break;
 217         case XSCALE_COUNTER0:
 218                 mask = XSCALE1_COUNT0_EVT_MASK;
 219                 evt = (hwc->config_base << XSCALE1_COUNT0_EVT_SHFT) |
 220                         XSCALE1_COUNT0_INT_EN;
 221                 break;
 222         case XSCALE_COUNTER1:
 223                 mask = XSCALE1_COUNT1_EVT_MASK;
 224                 evt = (hwc->config_base << XSCALE1_COUNT1_EVT_SHFT) |
 225                         XSCALE1_COUNT1_INT_EN;
 226                 break;
 227         default:
 228                 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
 229                 return;
 230         }
 231
 232         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 233         val = xscale1pmu_read_pmnc();
 234         val &= ~mask;
 235         val |= evt;
 236         xscale1pmu_write_pmnc(val);
 237         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 238 }
 239
 240 static void xscale1pmu_disable_event(struct perf_event *event)
 241 {
 242         unsigned long val, mask, evt, flags;
 243         struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
 244         struct hw_perf_event *hwc = &event->hw;
 245         struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
 246         int idx = hwc->idx;
 247
 248         switch (idx) {
 249         case XSCALE_CYCLE_COUNTER:
 250                 mask = XSCALE1_CCOUNT_INT_EN;
 251                 evt = 0;
 252                 break;
 253         case XSCALE_COUNTER0:
 254                 mask = XSCALE1_COUNT0_INT_EN | XSCALE1_COUNT0_EVT_MASK;
 255                 evt = XSCALE_PERFCTR_UNUSED << XSCALE1_COUNT0_EVT_SHFT;
 256                 break;
 257         case XSCALE_COUNTER1:
 258                 mask = XSCALE1_COUNT1_INT_EN | XSCALE1_COUNT1_EVT_MASK;
 259                 evt = XSCALE_PERFCTR_UNUSED << XSCALE1_COUNT1_EVT_SHFT;
 260                 break;
 261         default:
 262                 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
 263                 return;
 264         }
 265
 266         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 267         val = xscale1pmu_read_pmnc();
 268         val &= ~mask;
 269         val |= evt;
 270         xscale1pmu_write_pmnc(val);
 271         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 272 }
 273
 274 static int
 275 xscale1pmu_get_event_idx(struct pmu_hw_events *cpuc,
 276                                 struct perf_event *event)
 277 {
 278         struct hw_perf_event *hwc = &event->hw;
 279         if (XSCALE_PERFCTR_CCNT == hwc->config_base) {
 280                 if (test_and_set_bit(XSCALE_CYCLE_COUNTER, cpuc->used_mask))
 281                         return -EAGAIN;
 282
 283                 return XSCALE_CYCLE_COUNTER;
 284         } else {
 285                 if (!test_and_set_bit(XSCALE_COUNTER1, cpuc->used_mask))
 286                         return XSCALE_COUNTER1;
 287
 288                 if (!test_and_set_bit(XSCALE_COUNTER0, cpuc->used_mask))
 289                         return XSCALE_COUNTER0;
 290
 291                 return -EAGAIN;
 292         }
 293 }
 294
 295 static void xscalepmu_clear_event_idx(struct pmu_hw_events *cpuc,
 296                                      struct perf_event *event)
 297 {
 298         clear_bit(event->hw.idx, cpuc->used_mask);
 299 }
 300
 301 static void xscale1pmu_start(struct arm_pmu *cpu_pmu)
 302 {
 303         unsigned long flags, val;
 304         struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
 305
 306         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 307         val = xscale1pmu_read_pmnc();
 308         val |= XSCALE_PMU_ENABLE;
 309         xscale1pmu_write_pmnc(val);
 310         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 311 }
 312
 313 static void xscale1pmu_stop(struct arm_pmu *cpu_pmu)
 314 {
 315         unsigned long flags, val;
 316         struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
 317
 318         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 319         val = xscale1pmu_read_pmnc();
 320         val &= ~XSCALE_PMU_ENABLE;
 321         xscale1pmu_write_pmnc(val);
 322         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 323 }
 324
 325 static inline u64 xscale1pmu_read_counter(struct perf_event *event)
 326 {
 327         struct hw_perf_event *hwc = &event->hw;
 328         int counter = hwc->idx;
 329         u32 val = 0;
 330
 331         switch (counter) {
 332         case XSCALE_CYCLE_COUNTER:
 333                 asm volatile("mrc p14, 0, %0, c1, c0, 0" : "=r" (val));
 334                 break;
 335         case XSCALE_COUNTER0:
 336                 asm volatile("mrc p14, 0, %0, c2, c0, 0" : "=r" (val));
 337                 break;
 338         case XSCALE_COUNTER1:
 339                 asm volatile("mrc p14, 0, %0, c3, c0, 0" : "=r" (val));
 340                 break;
 341         }
 342
 343         return val;
 344 }
 345
 346 static inline void xscale1pmu_write_counter(struct perf_event *event, u64 val)
 347 {
 348         struct hw_perf_event *hwc = &event->hw;
 349         int counter = hwc->idx;
 350
 351         switch (counter) {
 352         case XSCALE_CYCLE_COUNTER:
 353                 asm volatile("mcr p14, 0, %0, c1, c0, 0" : : "r" (val));
 354                 break;
 355         case XSCALE_COUNTER0:
 356                 asm volatile("mcr p14, 0, %0, c2, c0, 0" : : "r" (val));
 357                 break;
 358         case XSCALE_COUNTER1:
 359                 asm volatile("mcr p14, 0, %0, c3, c0, 0" : : "r" (val));
 360                 break;
 361         }
 362 }
 363
 364 static int xscale_map_event(struct perf_event *event)
 365 {
 366         return armpmu_map_event(event, &xscale_perf_map,
 367                                 &xscale_perf_cache_map, 0xFF);
 368 }
 369
 370 static int xscale1pmu_init(struct arm_pmu *cpu_pmu)
 371 {
 372         cpu_pmu->name           = "armv5_xscale1";
 373         cpu_pmu->handle_irq     = xscale1pmu_handle_irq;
 374         cpu_pmu->enable         = xscale1pmu_enable_event;
 375         cpu_pmu->disable        = xscale1pmu_disable_event;
 376         cpu_pmu->read_counter   = xscale1pmu_read_counter;
 377         cpu_pmu->write_counter  = xscale1pmu_write_counter;
 378         cpu_pmu->get_event_idx  = xscale1pmu_get_event_idx;
 379         cpu_pmu->clear_event_idx = xscalepmu_clear_event_idx;
 380         cpu_pmu->start          = xscale1pmu_start;
 381         cpu_pmu->stop           = xscale1pmu_stop;
 382         cpu_pmu->map_event      = xscale_map_event;
 383         cpu_pmu->num_events     = 3;
 384
 385         return 0;
 386 }
 387
 388 #define XSCALE2_OVERFLOWED_MASK 0x01f
 389 #define XSCALE2_CCOUNT_OVERFLOW 0x001
 390 #define XSCALE2_COUNT0_OVERFLOW 0x002
 391 #define XSCALE2_COUNT1_OVERFLOW 0x004
 392 #define XSCALE2_COUNT2_OVERFLOW 0x008
 393 #define XSCALE2_COUNT3_OVERFLOW 0x010
 394 #define XSCALE2_CCOUNT_INT_EN   0x001
 395 #define XSCALE2_COUNT0_INT_EN   0x002
 396 #define XSCALE2_COUNT1_INT_EN   0x004
 397 #define XSCALE2_COUNT2_INT_EN   0x008
 398 #define XSCALE2_COUNT3_INT_EN   0x010
 399 #define XSCALE2_COUNT0_EVT_SHFT 0
 400 #define XSCALE2_COUNT0_EVT_MASK (0xff << XSCALE2_COUNT0_EVT_SHFT)
 401 #define XSCALE2_COUNT1_EVT_SHFT 8
 402 #define XSCALE2_COUNT1_EVT_MASK (0xff << XSCALE2_COUNT1_EVT_SHFT)
 403 #define XSCALE2_COUNT2_EVT_SHFT 16
 404 #define XSCALE2_COUNT2_EVT_MASK (0xff << XSCALE2_COUNT2_EVT_SHFT)
 405 #define XSCALE2_COUNT3_EVT_SHFT 24
 406 #define XSCALE2_COUNT3_EVT_MASK (0xff << XSCALE2_COUNT3_EVT_SHFT)
 407
 408 static inline u32
 409 xscale2pmu_read_pmnc(void)
 410 {
 411         u32 val;
 412         asm volatile("mrc p14, 0, %0, c0, c1, 0" : "=r" (val));
 413         /* bits 1-2 and 4-23 are read-unpredictable */
 414         return val & 0xff000009;
 415 }
 416
 417 static inline void
 418 xscale2pmu_write_pmnc(u32 val)
 419 {
 420         /* bits 4-23 are write-as-0, 24-31 are write ignored */
 421         val &= 0xf;
 422         asm volatile("mcr p14, 0, %0, c0, c1, 0" : : "r" (val));
 423 }
 424
 425 static inline u32
 426 xscale2pmu_read_overflow_flags(void)
 427 {
 428         u32 val;
 429         asm volatile("mrc p14, 0, %0, c5, c1, 0" : "=r" (val));
 430         return val;
 431 }
 432
 433 static inline void
 434 xscale2pmu_write_overflow_flags(u32 val)
 435 {
 436         asm volatile("mcr p14, 0, %0, c5, c1, 0" : : "r" (val));
 437 }
 438
 439 static inline u32
 440 xscale2pmu_read_event_select(void)
 441 {
 442         u32 val;
 443         asm volatile("mrc p14, 0, %0, c8, c1, 0" : "=r" (val));
 444         return val;
 445 }
 446
 447 static inline void
 448 xscale2pmu_write_event_select(u32 val)
 449 {
 450         asm volatile("mcr p14, 0, %0, c8, c1, 0" : : "r"(val));
 451 }
 452
 453 static inline u32
 454 xscale2pmu_read_int_enable(void)
 455 {
 456         u32 val;
 457         asm volatile("mrc p14, 0, %0, c4, c1, 0" : "=r" (val));
 458         return val;
 459 }
 460
 461 static void
 462 xscale2pmu_write_int_enable(u32 val)
 463 {
 464         asm volatile("mcr p14, 0, %0, c4, c1, 0" : : "r" (val));
 465 }
 466
 467 static inline int
 468 xscale2_pmnc_counter_has_overflowed(unsigned long of_flags,
 469                                         enum xscale_counters counter)
 470 {
 471         int ret = 0;
 472
 473         switch (counter) {
 474         case XSCALE_CYCLE_COUNTER:
 475                 ret = of_flags & XSCALE2_CCOUNT_OVERFLOW;
 476                 break;
 477         case XSCALE_COUNTER0:
 478                 ret = of_flags & XSCALE2_COUNT0_OVERFLOW;
 479                 break;
 480         case XSCALE_COUNTER1:
 481                 ret = of_flags & XSCALE2_COUNT1_OVERFLOW;
 482                 break;
 483         case XSCALE_COUNTER2:
 484                 ret = of_flags & XSCALE2_COUNT2_OVERFLOW;
 485                 break;
 486         case XSCALE_COUNTER3:
 487                 ret = of_flags & XSCALE2_COUNT3_OVERFLOW;
 488                 break;
 489         default:
 490                 WARN_ONCE(1, "invalid counter number (%d)\n", counter);
 491         }
 492
 493         return ret;
 494 }
 495
 496 static irqreturn_t
 497 xscale2pmu_handle_irq(struct arm_pmu *cpu_pmu)
 498 {
 499         unsigned long pmnc, of_flags;
 500         struct perf_sample_data data;
 501         struct pmu_hw_events *cpuc = this_cpu_ptr(cpu_pmu->hw_events);
 502         struct pt_regs *regs;
 503         int idx;
 504
 505         /* Disable the PMU. */
 506         pmnc = xscale2pmu_read_pmnc();
 507         xscale2pmu_write_pmnc(pmnc & ~XSCALE_PMU_ENABLE);
 508
 509         /* Check the overflow flag register. */
 510         of_flags = xscale2pmu_read_overflow_flags();
 511         if (!(of_flags & XSCALE2_OVERFLOWED_MASK))
 512                 return IRQ_NONE;
 513
 514         /* Clear the overflow bits. */
 515         xscale2pmu_write_overflow_flags(of_flags);
 516
 517         regs = get_irq_regs();
 518
 519         for (idx = 0; idx < cpu_pmu->num_events; ++idx) {
 520                 struct perf_event *event = cpuc->events[idx];
 521                 struct hw_perf_event *hwc;
 522
 523                 if (!event)
 524                         continue;
 525
 526                 if (!xscale2_pmnc_counter_has_overflowed(of_flags, idx))
 527                         continue;
 528
 529                 hwc = &event->hw;
 530                 armpmu_event_update(event);
 531                 perf_sample_data_init(&data, 0, hwc->last_period);
 532                 if (!armpmu_event_set_period(event))
 533                         continue;
 534
 535                 if (perf_event_overflow(event, &data, regs))
 536                         cpu_pmu->disable(event);
 537         }
 538
 539         irq_work_run();
 540
 541         /*
 542          * Re-enable the PMU.
 543          */
 544         pmnc = xscale2pmu_read_pmnc() | XSCALE_PMU_ENABLE;
 545         xscale2pmu_write_pmnc(pmnc);
 546
 547         return IRQ_HANDLED;
 548 }
 549
 550 static void xscale2pmu_enable_event(struct perf_event *event)
 551 {
 552         unsigned long flags, ien, evtsel;
 553         struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
 554         struct hw_perf_event *hwc = &event->hw;
 555         struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
 556         int idx = hwc->idx;
 557
 558         ien = xscale2pmu_read_int_enable();
 559         evtsel = xscale2pmu_read_event_select();
 560
 561         switch (idx) {
 562         case XSCALE_CYCLE_COUNTER:
 563                 ien |= XSCALE2_CCOUNT_INT_EN;
 564                 break;
 565         case XSCALE_COUNTER0:
 566                 ien |= XSCALE2_COUNT0_INT_EN;
 567                 evtsel &= ~XSCALE2_COUNT0_EVT_MASK;
 568                 evtsel |= hwc->config_base << XSCALE2_COUNT0_EVT_SHFT;
 569                 break;
 570         case XSCALE_COUNTER1:
 571                 ien |= XSCALE2_COUNT1_INT_EN;
 572                 evtsel &= ~XSCALE2_COUNT1_EVT_MASK;
 573                 evtsel |= hwc->config_base << XSCALE2_COUNT1_EVT_SHFT;
 574                 break;
 575         case XSCALE_COUNTER2:
 576                 ien |= XSCALE2_COUNT2_INT_EN;
 577                 evtsel &= ~XSCALE2_COUNT2_EVT_MASK;
 578                 evtsel |= hwc->config_base << XSCALE2_COUNT2_EVT_SHFT;
 579                 break;
 580         case XSCALE_COUNTER3:
 581                 ien |= XSCALE2_COUNT3_INT_EN;
 582                 evtsel &= ~XSCALE2_COUNT3_EVT_MASK;
 583                 evtsel |= hwc->config_base << XSCALE2_COUNT3_EVT_SHFT;
 584                 break;
 585         default:
 586                 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
 587                 return;
 588         }
 589
 590         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 591         xscale2pmu_write_event_select(evtsel);
 592         xscale2pmu_write_int_enable(ien);
 593         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 594 }
 595
 596 static void xscale2pmu_disable_event(struct perf_event *event)
 597 {
 598         unsigned long flags, ien, evtsel, of_flags;
 599         struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
 600         struct hw_perf_event *hwc = &event->hw;
 601         struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
 602         int idx = hwc->idx;
 603
 604         ien = xscale2pmu_read_int_enable();
 605         evtsel = xscale2pmu_read_event_select();
 606
 607         switch (idx) {
 608         case XSCALE_CYCLE_COUNTER:
 609                 ien &= ~XSCALE2_CCOUNT_INT_EN;
 610                 of_flags = XSCALE2_CCOUNT_OVERFLOW;
 611                 break;
 612         case XSCALE_COUNTER0:
 613                 ien &= ~XSCALE2_COUNT0_INT_EN;
 614                 evtsel &= ~XSCALE2_COUNT0_EVT_MASK;
 615                 evtsel |= XSCALE_PERFCTR_UNUSED << XSCALE2_COUNT0_EVT_SHFT;
 616                 of_flags = XSCALE2_COUNT0_OVERFLOW;
 617                 break;
 618         case XSCALE_COUNTER1:
 619                 ien &= ~XSCALE2_COUNT1_INT_EN;
 620                 evtsel &= ~XSCALE2_COUNT1_EVT_MASK;
 621                 evtsel |= XSCALE_PERFCTR_UNUSED << XSCALE2_COUNT1_EVT_SHFT;
 622                 of_flags = XSCALE2_COUNT1_OVERFLOW;
 623                 break;
 624         case XSCALE_COUNTER2:
 625                 ien &= ~XSCALE2_COUNT2_INT_EN;
 626                 evtsel &= ~XSCALE2_COUNT2_EVT_MASK;
 627                 evtsel |= XSCALE_PERFCTR_UNUSED << XSCALE2_COUNT2_EVT_SHFT;
 628                 of_flags = XSCALE2_COUNT2_OVERFLOW;
 629                 break;
 630         case XSCALE_COUNTER3:
 631                 ien &= ~XSCALE2_COUNT3_INT_EN;
 632                 evtsel &= ~XSCALE2_COUNT3_EVT_MASK;
 633                 evtsel |= XSCALE_PERFCTR_UNUSED << XSCALE2_COUNT3_EVT_SHFT;
 634                 of_flags = XSCALE2_COUNT3_OVERFLOW;
 635                 break;
 636         default:
 637                 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
 638                 return;
 639         }
 640
 641         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 642         xscale2pmu_write_event_select(evtsel);
 643         xscale2pmu_write_int_enable(ien);
 644         xscale2pmu_write_overflow_flags(of_flags);
 645         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 646 }
 647
 648 static int
 649 xscale2pmu_get_event_idx(struct pmu_hw_events *cpuc,
 650                                 struct perf_event *event)
 651 {
 652         int idx = xscale1pmu_get_event_idx(cpuc, event);
 653         if (idx >= 0)
 654                 goto out;
 655
 656         if (!test_and_set_bit(XSCALE_COUNTER3, cpuc->used_mask))
 657                 idx = XSCALE_COUNTER3;
 658         else if (!test_and_set_bit(XSCALE_COUNTER2, cpuc->used_mask))
 659                 idx = XSCALE_COUNTER2;
 660 out:
 661         return idx;
 662 }
 663
 664 static void xscale2pmu_start(struct arm_pmu *cpu_pmu)
 665 {
 666         unsigned long flags, val;
 667         struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
 668
 669         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 670         val = xscale2pmu_read_pmnc() & ~XSCALE_PMU_CNT64;
 671         val |= XSCALE_PMU_ENABLE;
 672         xscale2pmu_write_pmnc(val);
 673         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 674 }
 675
 676 static void xscale2pmu_stop(struct arm_pmu *cpu_pmu)
 677 {
 678         unsigned long flags, val;
 679         struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
 680
 681         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 682         val = xscale2pmu_read_pmnc();
 683         val &= ~XSCALE_PMU_ENABLE;
 684         xscale2pmu_write_pmnc(val);
 685         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 686 }
 687
 688 static inline u64 xscale2pmu_read_counter(struct perf_event *event)
 689 {
 690         struct hw_perf_event *hwc = &event->hw;
 691         int counter = hwc->idx;
 692         u32 val = 0;
 693
 694         switch (counter) {
 695         case XSCALE_CYCLE_COUNTER:
 696                 asm volatile("mrc p14, 0, %0, c1, c1, 0" : "=r" (val));
 697                 break;
 698         case XSCALE_COUNTER0:
 699                 asm volatile("mrc p14, 0, %0, c0, c2, 0" : "=r" (val));
 700                 break;
 701         case XSCALE_COUNTER1:
 702                 asm volatile("mrc p14, 0, %0, c1, c2, 0" : "=r" (val));
 703                 break;
 704         case XSCALE_COUNTER2:
 705                 asm volatile("mrc p14, 0, %0, c2, c2, 0" : "=r" (val));
 706                 break;
 707         case XSCALE_COUNTER3:
 708                 asm volatile("mrc p14, 0, %0, c3, c2, 0" : "=r" (val));
 709                 break;
 710         }
 711
 712         return val;
 713 }
 714
 715 static inline void xscale2pmu_write_counter(struct perf_event *event, u64 val)
 716 {
 717         struct hw_perf_event *hwc = &event->hw;
 718         int counter = hwc->idx;
 719
 720         switch (counter) {
 721         case XSCALE_CYCLE_COUNTER:
 722                 asm volatile("mcr p14, 0, %0, c1, c1, 0" : : "r" (val));
 723                 break;
 724         case XSCALE_COUNTER0:
 725                 asm volatile("mcr p14, 0, %0, c0, c2, 0" : : "r" (val));
 726                 break;
 727         case XSCALE_COUNTER1:
 728                 asm volatile("mcr p14, 0, %0, c1, c2, 0" : : "r" (val));
 729                 break;
 730         case XSCALE_COUNTER2:
 731                 asm volatile("mcr p14, 0, %0, c2, c2, 0" : : "r" (val));
 732                 break;
 733         case XSCALE_COUNTER3:
 734                 asm volatile("mcr p14, 0, %0, c3, c2, 0" : : "r" (val));
 735                 break;
 736         }
 737 }
 738
 739 static int xscale2pmu_init(struct arm_pmu *cpu_pmu)
 740 {
 741         cpu_pmu->name           = "armv5_xscale2";
 742         cpu_pmu->handle_irq     = xscale2pmu_handle_irq;
 743         cpu_pmu->enable         = xscale2pmu_enable_event;
 744         cpu_pmu->disable        = xscale2pmu_disable_event;
 745         cpu_pmu->read_counter   = xscale2pmu_read_counter;
 746         cpu_pmu->write_counter  = xscale2pmu_write_counter;
 747         cpu_pmu->get_event_idx  = xscale2pmu_get_event_idx;
 748         cpu_pmu->clear_event_idx = xscalepmu_clear_event_idx;
 749         cpu_pmu->start          = xscale2pmu_start;
 750         cpu_pmu->stop           = xscale2pmu_stop;
 751         cpu_pmu->map_event      = xscale_map_event;
 752         cpu_pmu->num_events     = 5;
 753
 754         return 0;
 755 }
 756
 757 static const struct pmu_probe_info xscale_pmu_probe_table[] = {
 758         XSCALE_PMU_PROBE(ARM_CPU_XSCALE_ARCH_V1, xscale1pmu_init),
 759         XSCALE_PMU_PROBE(ARM_CPU_XSCALE_ARCH_V2, xscale2pmu_init),
 760         { /* sentinel value */ }
 761 };
 762
 763 static int xscale_pmu_device_probe(struct platform_device *pdev)
 764 {
 765         return arm_pmu_device_probe(pdev, NULL, xscale_pmu_probe_table);
 766 }
 767
 768 static struct platform_driver xscale_pmu_driver = {
 769         .driver         = {
 770                 .name   = "xscale-pmu",
 771         },
 772         .probe          = xscale_pmu_device_probe,
 773 };
 774
 775 builtin_platform_driver(xscale_pmu_driver);
 776 #endif  /* CONFIG_CPU_XSCALE */