arch/arm/kernel/perf_event

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This source file includes following definitions.
armv6_pmcr_read
armv6_pmcr_write
armv6_pmcr_has_overflowed
armv6_pmcr_counter_has_overflowed
armv6pmu_read_counter
armv6pmu_write_counter
armv6pmu_enable_event
armv6pmu_handle_irq
armv6pmu_start
armv6pmu_stop
armv6pmu_get_event_idx
armv6pmu_clear_event_idx
armv6pmu_disable_event
armv6mpcore_pmu_disable_event
armv6_map_event
armv6pmu_init
armv6_1136_pmu_init
armv6_1156_pmu_init
armv6_1176_pmu_init
armv6mpcore_map_event
armv6mpcore_pmu_init
armv6_pmu_device_probe
   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * ARMv6 Performance counter handling code.
   4  *
   5  * Copyright (C) 2009 picoChip Designs, Ltd., Jamie Iles
   6  *
   7  * ARMv6 has 2 configurable performance counters and a single cycle counter.
   8  * They all share a single reset bit but can be written to zero so we can use
   9  * that for a reset.
  10  *
  11  * The counters can't be individually enabled or disabled so when we remove
  12  * one event and replace it with another we could get spurious counts from the
  13  * wrong event. However, we can take advantage of the fact that the
  14  * performance counters can export events to the event bus, and the event bus
  15  * itself can be monitored. This requires that we *don't* export the events to
  16  * the event bus. The procedure for disabling a configurable counter is:
  17  *      - change the counter to count the ETMEXTOUT[0] signal (0x20). This
  18  *        effectively stops the counter from counting.
  19  *      - disable the counter's interrupt generation (each counter has it's
  20  *        own interrupt enable bit).
  21  * Once stopped, the counter value can be written as 0 to reset.
  22  *
  23  * To enable a counter:
  24  *      - enable the counter's interrupt generation.
  25  *      - set the new event type.
  26  *
  27  * Note: the dedicated cycle counter only counts cycles and can't be
  28  * enabled/disabled independently of the others. When we want to disable the
  29  * cycle counter, we have to just disable the interrupt reporting and start
  30  * ignoring that counter. When re-enabling, we have to reset the value and
  31  * enable the interrupt.
  32  */
  33 
  34 #if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K)
  35 
  36 #include <asm/cputype.h>
  37 #include <asm/irq_regs.h>
  38 
  39 #include <linux/of.h>
  40 #include <linux/perf/arm_pmu.h>
  41 #include <linux/platform_device.h>
  42 
  43 enum armv6_perf_types {
  44         ARMV6_PERFCTR_ICACHE_MISS           = 0x0,
  45         ARMV6_PERFCTR_IBUF_STALL            = 0x1,
  46         ARMV6_PERFCTR_DDEP_STALL            = 0x2,
  47         ARMV6_PERFCTR_ITLB_MISS             = 0x3,
  48         ARMV6_PERFCTR_DTLB_MISS             = 0x4,
  49         ARMV6_PERFCTR_BR_EXEC               = 0x5,
  50         ARMV6_PERFCTR_BR_MISPREDICT         = 0x6,
  51         ARMV6_PERFCTR_INSTR_EXEC            = 0x7,
  52         ARMV6_PERFCTR_DCACHE_HIT            = 0x9,
  53         ARMV6_PERFCTR_DCACHE_ACCESS         = 0xA,
  54         ARMV6_PERFCTR_DCACHE_MISS           = 0xB,
  55         ARMV6_PERFCTR_DCACHE_WBACK          = 0xC,
  56         ARMV6_PERFCTR_SW_PC_CHANGE          = 0xD,
  57         ARMV6_PERFCTR_MAIN_TLB_MISS         = 0xF,
  58         ARMV6_PERFCTR_EXPL_D_ACCESS         = 0x10,
  59         ARMV6_PERFCTR_LSU_FULL_STALL        = 0x11,
  60         ARMV6_PERFCTR_WBUF_DRAINED          = 0x12,
  61         ARMV6_PERFCTR_CPU_CYCLES            = 0xFF,
  62         ARMV6_PERFCTR_NOP                   = 0x20,
  63 };
  64 
  65 enum armv6_counters {
  66         ARMV6_CYCLE_COUNTER = 0,
  67         ARMV6_COUNTER0,
  68         ARMV6_COUNTER1,
  69 };
  70 
  71 /*
  72  * The hardware events that we support. We do support cache operations but
  73  * we have harvard caches and no way to combine instruction and data
  74  * accesses/misses in hardware.
  75  */
  76 static const unsigned armv6_perf_map[PERF_COUNT_HW_MAX] = {
  77         PERF_MAP_ALL_UNSUPPORTED,
  78         [PERF_COUNT_HW_CPU_CYCLES]              = ARMV6_PERFCTR_CPU_CYCLES,
  79         [PERF_COUNT_HW_INSTRUCTIONS]            = ARMV6_PERFCTR_INSTR_EXEC,
  80         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS]     = ARMV6_PERFCTR_BR_EXEC,
  81         [PERF_COUNT_HW_BRANCH_MISSES]           = ARMV6_PERFCTR_BR_MISPREDICT,
  82         [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = ARMV6_PERFCTR_IBUF_STALL,
  83         [PERF_COUNT_HW_STALLED_CYCLES_BACKEND]  = ARMV6_PERFCTR_LSU_FULL_STALL,
  84 };
  85 
  86 static const unsigned armv6_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
  87                                           [PERF_COUNT_HW_CACHE_OP_MAX]
  88                                           [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
  89         PERF_CACHE_MAP_ALL_UNSUPPORTED,
  90 
  91         /*
  92          * The performance counters don't differentiate between read and write
  93          * accesses/misses so this isn't strictly correct, but it's the best we
  94          * can do. Writes and reads get combined.
  95          */
  96         [C(L1D)][C(OP_READ)][C(RESULT_ACCESS)]  = ARMV6_PERFCTR_DCACHE_ACCESS,
  97         [C(L1D)][C(OP_READ)][C(RESULT_MISS)]    = ARMV6_PERFCTR_DCACHE_MISS,
  98         [C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV6_PERFCTR_DCACHE_ACCESS,
  99         [C(L1D)][C(OP_WRITE)][C(RESULT_MISS)]   = ARMV6_PERFCTR_DCACHE_MISS,
 100 
 101         [C(L1I)][C(OP_READ)][C(RESULT_MISS)]    = ARMV6_PERFCTR_ICACHE_MISS,
 102 
 103         /*
 104          * The ARM performance counters can count micro DTLB misses, micro ITLB
 105          * misses and main TLB misses. There isn't an event for TLB misses, so
 106          * use the micro misses here and if users want the main TLB misses they
 107          * can use a raw counter.
 108          */
 109         [C(DTLB)][C(OP_READ)][C(RESULT_MISS)]   = ARMV6_PERFCTR_DTLB_MISS,
 110         [C(DTLB)][C(OP_WRITE)][C(RESULT_MISS)]  = ARMV6_PERFCTR_DTLB_MISS,
 111 
 112         [C(ITLB)][C(OP_READ)][C(RESULT_MISS)]   = ARMV6_PERFCTR_ITLB_MISS,
 113         [C(ITLB)][C(OP_WRITE)][C(RESULT_MISS)]  = ARMV6_PERFCTR_ITLB_MISS,
 114 };
 115 
 116 enum armv6mpcore_perf_types {
 117         ARMV6MPCORE_PERFCTR_ICACHE_MISS     = 0x0,
 118         ARMV6MPCORE_PERFCTR_IBUF_STALL      = 0x1,
 119         ARMV6MPCORE_PERFCTR_DDEP_STALL      = 0x2,
 120         ARMV6MPCORE_PERFCTR_ITLB_MISS       = 0x3,
 121         ARMV6MPCORE_PERFCTR_DTLB_MISS       = 0x4,
 122         ARMV6MPCORE_PERFCTR_BR_EXEC         = 0x5,
 123         ARMV6MPCORE_PERFCTR_BR_NOTPREDICT   = 0x6,
 124         ARMV6MPCORE_PERFCTR_BR_MISPREDICT   = 0x7,
 125         ARMV6MPCORE_PERFCTR_INSTR_EXEC      = 0x8,
 126         ARMV6MPCORE_PERFCTR_DCACHE_RDACCESS = 0xA,
 127         ARMV6MPCORE_PERFCTR_DCACHE_RDMISS   = 0xB,
 128         ARMV6MPCORE_PERFCTR_DCACHE_WRACCESS = 0xC,
 129         ARMV6MPCORE_PERFCTR_DCACHE_WRMISS   = 0xD,
 130         ARMV6MPCORE_PERFCTR_DCACHE_EVICTION = 0xE,
 131         ARMV6MPCORE_PERFCTR_SW_PC_CHANGE    = 0xF,
 132         ARMV6MPCORE_PERFCTR_MAIN_TLB_MISS   = 0x10,
 133         ARMV6MPCORE_PERFCTR_EXPL_MEM_ACCESS = 0x11,
 134         ARMV6MPCORE_PERFCTR_LSU_FULL_STALL  = 0x12,
 135         ARMV6MPCORE_PERFCTR_WBUF_DRAINED    = 0x13,
 136         ARMV6MPCORE_PERFCTR_CPU_CYCLES      = 0xFF,
 137 };
 138 
 139 /*
 140  * The hardware events that we support. We do support cache operations but
 141  * we have harvard caches and no way to combine instruction and data
 142  * accesses/misses in hardware.
 143  */
 144 static const unsigned armv6mpcore_perf_map[PERF_COUNT_HW_MAX] = {
 145         PERF_MAP_ALL_UNSUPPORTED,
 146         [PERF_COUNT_HW_CPU_CYCLES]              = ARMV6MPCORE_PERFCTR_CPU_CYCLES,
 147         [PERF_COUNT_HW_INSTRUCTIONS]            = ARMV6MPCORE_PERFCTR_INSTR_EXEC,
 148         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS]     = ARMV6MPCORE_PERFCTR_BR_EXEC,
 149         [PERF_COUNT_HW_BRANCH_MISSES]           = ARMV6MPCORE_PERFCTR_BR_MISPREDICT,
 150         [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = ARMV6MPCORE_PERFCTR_IBUF_STALL,
 151         [PERF_COUNT_HW_STALLED_CYCLES_BACKEND]  = ARMV6MPCORE_PERFCTR_LSU_FULL_STALL,
 152 };
 153 
 154 static const unsigned armv6mpcore_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
 155                                         [PERF_COUNT_HW_CACHE_OP_MAX]
 156                                         [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
 157         PERF_CACHE_MAP_ALL_UNSUPPORTED,
 158 
 159         [C(L1D)][C(OP_READ)][C(RESULT_ACCESS)]  = ARMV6MPCORE_PERFCTR_DCACHE_RDACCESS,
 160         [C(L1D)][C(OP_READ)][C(RESULT_MISS)]    = ARMV6MPCORE_PERFCTR_DCACHE_RDMISS,
 161         [C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV6MPCORE_PERFCTR_DCACHE_WRACCESS,
 162         [C(L1D)][C(OP_WRITE)][C(RESULT_MISS)]   = ARMV6MPCORE_PERFCTR_DCACHE_WRMISS,
 163 
 164         [C(L1I)][C(OP_READ)][C(RESULT_MISS)]    = ARMV6MPCORE_PERFCTR_ICACHE_MISS,
 165 
 166         /*
 167          * The ARM performance counters can count micro DTLB misses, micro ITLB
 168          * misses and main TLB misses. There isn't an event for TLB misses, so
 169          * use the micro misses here and if users want the main TLB misses they
 170          * can use a raw counter.
 171          */
 172         [C(DTLB)][C(OP_READ)][C(RESULT_MISS)]   = ARMV6MPCORE_PERFCTR_DTLB_MISS,
 173         [C(DTLB)][C(OP_WRITE)][C(RESULT_MISS)]  = ARMV6MPCORE_PERFCTR_DTLB_MISS,
 174 
 175         [C(ITLB)][C(OP_READ)][C(RESULT_MISS)]   = ARMV6MPCORE_PERFCTR_ITLB_MISS,
 176         [C(ITLB)][C(OP_WRITE)][C(RESULT_MISS)]  = ARMV6MPCORE_PERFCTR_ITLB_MISS,
 177 };
 178 
 179 static inline unsigned long
 180 armv6_pmcr_read(void)
 181 {
 182         u32 val;
 183         asm volatile("mrc   p15, 0, %0, c15, c12, 0" : "=r"(val));
 184         return val;
 185 }
 186 
 187 static inline void
 188 armv6_pmcr_write(unsigned long val)
 189 {
 190         asm volatile("mcr   p15, 0, %0, c15, c12, 0" : : "r"(val));
 191 }
 192 
 193 #define ARMV6_PMCR_ENABLE               (1 << 0)
 194 #define ARMV6_PMCR_CTR01_RESET          (1 << 1)
 195 #define ARMV6_PMCR_CCOUNT_RESET         (1 << 2)
 196 #define ARMV6_PMCR_CCOUNT_DIV           (1 << 3)
 197 #define ARMV6_PMCR_COUNT0_IEN           (1 << 4)
 198 #define ARMV6_PMCR_COUNT1_IEN           (1 << 5)
 199 #define ARMV6_PMCR_CCOUNT_IEN           (1 << 6)
 200 #define ARMV6_PMCR_COUNT0_OVERFLOW      (1 << 8)
 201 #define ARMV6_PMCR_COUNT1_OVERFLOW      (1 << 9)
 202 #define ARMV6_PMCR_CCOUNT_OVERFLOW      (1 << 10)
 203 #define ARMV6_PMCR_EVT_COUNT0_SHIFT     20
 204 #define ARMV6_PMCR_EVT_COUNT0_MASK      (0xFF << ARMV6_PMCR_EVT_COUNT0_SHIFT)
 205 #define ARMV6_PMCR_EVT_COUNT1_SHIFT     12
 206 #define ARMV6_PMCR_EVT_COUNT1_MASK      (0xFF << ARMV6_PMCR_EVT_COUNT1_SHIFT)
 207 
 208 #define ARMV6_PMCR_OVERFLOWED_MASK \
 209         (ARMV6_PMCR_COUNT0_OVERFLOW | ARMV6_PMCR_COUNT1_OVERFLOW | \
 210          ARMV6_PMCR_CCOUNT_OVERFLOW)
 211 
 212 static inline int
 213 armv6_pmcr_has_overflowed(unsigned long pmcr)
 214 {
 215         return pmcr & ARMV6_PMCR_OVERFLOWED_MASK;
 216 }
 217 
 218 static inline int
 219 armv6_pmcr_counter_has_overflowed(unsigned long pmcr,
 220                                   enum armv6_counters counter)
 221 {
 222         int ret = 0;
 223 
 224         if (ARMV6_CYCLE_COUNTER == counter)
 225                 ret = pmcr & ARMV6_PMCR_CCOUNT_OVERFLOW;
 226         else if (ARMV6_COUNTER0 == counter)
 227                 ret = pmcr & ARMV6_PMCR_COUNT0_OVERFLOW;
 228         else if (ARMV6_COUNTER1 == counter)
 229                 ret = pmcr & ARMV6_PMCR_COUNT1_OVERFLOW;
 230         else
 231                 WARN_ONCE(1, "invalid counter number (%d)\n", counter);
 232 
 233         return ret;
 234 }
 235 
 236 static inline u64 armv6pmu_read_counter(struct perf_event *event)
 237 {
 238         struct hw_perf_event *hwc = &event->hw;
 239         int counter = hwc->idx;
 240         unsigned long value = 0;
 241 
 242         if (ARMV6_CYCLE_COUNTER == counter)
 243                 asm volatile("mrc   p15, 0, %0, c15, c12, 1" : "=r"(value));
 244         else if (ARMV6_COUNTER0 == counter)
 245                 asm volatile("mrc   p15, 0, %0, c15, c12, 2" : "=r"(value));
 246         else if (ARMV6_COUNTER1 == counter)
 247                 asm volatile("mrc   p15, 0, %0, c15, c12, 3" : "=r"(value));
 248         else
 249                 WARN_ONCE(1, "invalid counter number (%d)\n", counter);
 250 
 251         return value;
 252 }
 253 
 254 static inline void armv6pmu_write_counter(struct perf_event *event, u64 value)
 255 {
 256         struct hw_perf_event *hwc = &event->hw;
 257         int counter = hwc->idx;
 258 
 259         if (ARMV6_CYCLE_COUNTER == counter)
 260                 asm volatile("mcr   p15, 0, %0, c15, c12, 1" : : "r"(value));
 261         else if (ARMV6_COUNTER0 == counter)
 262                 asm volatile("mcr   p15, 0, %0, c15, c12, 2" : : "r"(value));
 263         else if (ARMV6_COUNTER1 == counter)
 264                 asm volatile("mcr   p15, 0, %0, c15, c12, 3" : : "r"(value));
 265         else
 266                 WARN_ONCE(1, "invalid counter number (%d)\n", counter);
 267 }
 268 
 269 static void armv6pmu_enable_event(struct perf_event *event)
 270 {
 271         unsigned long val, mask, evt, flags;
 272         struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
 273         struct hw_perf_event *hwc = &event->hw;
 274         struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
 275         int idx = hwc->idx;
 276 
 277         if (ARMV6_CYCLE_COUNTER == idx) {
 278                 mask    = 0;
 279                 evt     = ARMV6_PMCR_CCOUNT_IEN;
 280         } else if (ARMV6_COUNTER0 == idx) {
 281                 mask    = ARMV6_PMCR_EVT_COUNT0_MASK;
 282                 evt     = (hwc->config_base << ARMV6_PMCR_EVT_COUNT0_SHIFT) |
 283                           ARMV6_PMCR_COUNT0_IEN;
 284         } else if (ARMV6_COUNTER1 == idx) {
 285                 mask    = ARMV6_PMCR_EVT_COUNT1_MASK;
 286                 evt     = (hwc->config_base << ARMV6_PMCR_EVT_COUNT1_SHIFT) |
 287                           ARMV6_PMCR_COUNT1_IEN;
 288         } else {
 289                 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
 290                 return;
 291         }
 292 
 293         /*
 294          * Mask out the current event and set the counter to count the event
 295          * that we're interested in.
 296          */
 297         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 298         val = armv6_pmcr_read();
 299         val &= ~mask;
 300         val |= evt;
 301         armv6_pmcr_write(val);
 302         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 303 }
 304 
 305 static irqreturn_t
 306 armv6pmu_handle_irq(struct arm_pmu *cpu_pmu)
 307 {
 308         unsigned long pmcr = armv6_pmcr_read();
 309         struct perf_sample_data data;
 310         struct pmu_hw_events *cpuc = this_cpu_ptr(cpu_pmu->hw_events);
 311         struct pt_regs *regs;
 312         int idx;
 313 
 314         if (!armv6_pmcr_has_overflowed(pmcr))
 315                 return IRQ_NONE;
 316 
 317         regs = get_irq_regs();
 318 
 319         /*
 320          * The interrupts are cleared by writing the overflow flags back to
 321          * the control register. All of the other bits don't have any effect
 322          * if they are rewritten, so write the whole value back.
 323          */
 324         armv6_pmcr_write(pmcr);
 325 
 326         for (idx = 0; idx < cpu_pmu->num_events; ++idx) {
 327                 struct perf_event *event = cpuc->events[idx];
 328                 struct hw_perf_event *hwc;
 329 
 330                 /* Ignore if we don't have an event. */
 331                 if (!event)
 332                         continue;
 333 
 334                 /*
 335                  * We have a single interrupt for all counters. Check that
 336                  * each counter has overflowed before we process it.
 337                  */
 338                 if (!armv6_pmcr_counter_has_overflowed(pmcr, idx))
 339                         continue;
 340 
 341                 hwc = &event->hw;
 342                 armpmu_event_update(event);
 343                 perf_sample_data_init(&data, 0, hwc->last_period);
 344                 if (!armpmu_event_set_period(event))
 345                         continue;
 346 
 347                 if (perf_event_overflow(event, &data, regs))
 348                         cpu_pmu->disable(event);
 349         }
 350 
 351         /*
 352          * Handle the pending perf events.
 353          *
 354          * Note: this call *must* be run with interrupts disabled. For
 355          * platforms that can have the PMU interrupts raised as an NMI, this
 356          * will not work.
 357          */
 358         irq_work_run();
 359 
 360         return IRQ_HANDLED;
 361 }
 362 
 363 static void armv6pmu_start(struct arm_pmu *cpu_pmu)
 364 {
 365         unsigned long flags, val;
 366         struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
 367 
 368         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 369         val = armv6_pmcr_read();
 370         val |= ARMV6_PMCR_ENABLE;
 371         armv6_pmcr_write(val);
 372         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 373 }
 374 
 375 static void armv6pmu_stop(struct arm_pmu *cpu_pmu)
 376 {
 377         unsigned long flags, val;
 378         struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
 379 
 380         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 381         val = armv6_pmcr_read();
 382         val &= ~ARMV6_PMCR_ENABLE;
 383         armv6_pmcr_write(val);
 384         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 385 }
 386 
 387 static int
 388 armv6pmu_get_event_idx(struct pmu_hw_events *cpuc,
 389                                 struct perf_event *event)
 390 {
 391         struct hw_perf_event *hwc = &event->hw;
 392         /* Always place a cycle counter into the cycle counter. */
 393         if (ARMV6_PERFCTR_CPU_CYCLES == hwc->config_base) {
 394                 if (test_and_set_bit(ARMV6_CYCLE_COUNTER, cpuc->used_mask))
 395                         return -EAGAIN;
 396 
 397                 return ARMV6_CYCLE_COUNTER;
 398         } else {
 399                 /*
 400                  * For anything other than a cycle counter, try and use
 401                  * counter0 and counter1.
 402                  */
 403                 if (!test_and_set_bit(ARMV6_COUNTER1, cpuc->used_mask))
 404                         return ARMV6_COUNTER1;
 405 
 406                 if (!test_and_set_bit(ARMV6_COUNTER0, cpuc->used_mask))
 407                         return ARMV6_COUNTER0;
 408 
 409                 /* The counters are all in use. */
 410                 return -EAGAIN;
 411         }
 412 }
 413 
 414 static void armv6pmu_clear_event_idx(struct pmu_hw_events *cpuc,
 415                                      struct perf_event *event)
 416 {
 417         clear_bit(event->hw.idx, cpuc->used_mask);
 418 }
 419 
 420 static void armv6pmu_disable_event(struct perf_event *event)
 421 {
 422         unsigned long val, mask, evt, flags;
 423         struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
 424         struct hw_perf_event *hwc = &event->hw;
 425         struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
 426         int idx = hwc->idx;
 427 
 428         if (ARMV6_CYCLE_COUNTER == idx) {
 429                 mask    = ARMV6_PMCR_CCOUNT_IEN;
 430                 evt     = 0;
 431         } else if (ARMV6_COUNTER0 == idx) {
 432                 mask    = ARMV6_PMCR_COUNT0_IEN | ARMV6_PMCR_EVT_COUNT0_MASK;
 433                 evt     = ARMV6_PERFCTR_NOP << ARMV6_PMCR_EVT_COUNT0_SHIFT;
 434         } else if (ARMV6_COUNTER1 == idx) {
 435                 mask    = ARMV6_PMCR_COUNT1_IEN | ARMV6_PMCR_EVT_COUNT1_MASK;
 436                 evt     = ARMV6_PERFCTR_NOP << ARMV6_PMCR_EVT_COUNT1_SHIFT;
 437         } else {
 438                 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
 439                 return;
 440         }
 441 
 442         /*
 443          * Mask out the current event and set the counter to count the number
 444          * of ETM bus signal assertion cycles. The external reporting should
 445          * be disabled and so this should never increment.
 446          */
 447         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 448         val = armv6_pmcr_read();
 449         val &= ~mask;
 450         val |= evt;
 451         armv6_pmcr_write(val);
 452         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 453 }
 454 
 455 static void armv6mpcore_pmu_disable_event(struct perf_event *event)
 456 {
 457         unsigned long val, mask, flags, evt = 0;
 458         struct arm_pmu *cpu_pmu = to_arm_pmu(event->pmu);
 459         struct hw_perf_event *hwc = &event->hw;
 460         struct pmu_hw_events *events = this_cpu_ptr(cpu_pmu->hw_events);
 461         int idx = hwc->idx;
 462 
 463         if (ARMV6_CYCLE_COUNTER == idx) {
 464                 mask    = ARMV6_PMCR_CCOUNT_IEN;
 465         } else if (ARMV6_COUNTER0 == idx) {
 466                 mask    = ARMV6_PMCR_COUNT0_IEN;
 467         } else if (ARMV6_COUNTER1 == idx) {
 468                 mask    = ARMV6_PMCR_COUNT1_IEN;
 469         } else {
 470                 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
 471                 return;
 472         }
 473 
 474         /*
 475          * Unlike UP ARMv6, we don't have a way of stopping the counters. We
 476          * simply disable the interrupt reporting.
 477          */
 478         raw_spin_lock_irqsave(&events->pmu_lock, flags);
 479         val = armv6_pmcr_read();
 480         val &= ~mask;
 481         val |= evt;
 482         armv6_pmcr_write(val);
 483         raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
 484 }
 485 
 486 static int armv6_map_event(struct perf_event *event)
 487 {
 488         return armpmu_map_event(event, &armv6_perf_map,
 489                                 &armv6_perf_cache_map, 0xFF);
 490 }
 491 
 492 static void armv6pmu_init(struct arm_pmu *cpu_pmu)
 493 {
 494         cpu_pmu->handle_irq     = armv6pmu_handle_irq;
 495         cpu_pmu->enable         = armv6pmu_enable_event;
 496         cpu_pmu->disable        = armv6pmu_disable_event;
 497         cpu_pmu->read_counter   = armv6pmu_read_counter;
 498         cpu_pmu->write_counter  = armv6pmu_write_counter;
 499         cpu_pmu->get_event_idx  = armv6pmu_get_event_idx;
 500         cpu_pmu->clear_event_idx = armv6pmu_clear_event_idx;
 501         cpu_pmu->start          = armv6pmu_start;
 502         cpu_pmu->stop           = armv6pmu_stop;
 503         cpu_pmu->map_event      = armv6_map_event;
 504         cpu_pmu->num_events     = 3;
 505 }
 506 
 507 static int armv6_1136_pmu_init(struct arm_pmu *cpu_pmu)
 508 {
 509         armv6pmu_init(cpu_pmu);
 510         cpu_pmu->name           = "armv6_1136";
 511         return 0;
 512 }
 513 
 514 static int armv6_1156_pmu_init(struct arm_pmu *cpu_pmu)
 515 {
 516         armv6pmu_init(cpu_pmu);
 517         cpu_pmu->name           = "armv6_1156";
 518         return 0;
 519 }
 520 
 521 static int armv6_1176_pmu_init(struct arm_pmu *cpu_pmu)
 522 {
 523         armv6pmu_init(cpu_pmu);
 524         cpu_pmu->name           = "armv6_1176";
 525         return 0;
 526 }
 527 
 528 /*
 529  * ARMv6mpcore is almost identical to single core ARMv6 with the exception
 530  * that some of the events have different enumerations and that there is no
 531  * *hack* to stop the programmable counters. To stop the counters we simply
 532  * disable the interrupt reporting and update the event. When unthrottling we
 533  * reset the period and enable the interrupt reporting.
 534  */
 535 
 536 static int armv6mpcore_map_event(struct perf_event *event)
 537 {
 538         return armpmu_map_event(event, &armv6mpcore_perf_map,
 539                                 &armv6mpcore_perf_cache_map, 0xFF);
 540 }
 541 
 542 static int armv6mpcore_pmu_init(struct arm_pmu *cpu_pmu)
 543 {
 544         cpu_pmu->name           = "armv6_11mpcore";
 545         cpu_pmu->handle_irq     = armv6pmu_handle_irq;
 546         cpu_pmu->enable         = armv6pmu_enable_event;
 547         cpu_pmu->disable        = armv6mpcore_pmu_disable_event;
 548         cpu_pmu->read_counter   = armv6pmu_read_counter;
 549         cpu_pmu->write_counter  = armv6pmu_write_counter;
 550         cpu_pmu->get_event_idx  = armv6pmu_get_event_idx;
 551         cpu_pmu->clear_event_idx = armv6pmu_clear_event_idx;
 552         cpu_pmu->start          = armv6pmu_start;
 553         cpu_pmu->stop           = armv6pmu_stop;
 554         cpu_pmu->map_event      = armv6mpcore_map_event;
 555         cpu_pmu->num_events     = 3;
 556 
 557         return 0;
 558 }
 559 
 560 static const struct of_device_id armv6_pmu_of_device_ids[] = {
 561         {.compatible = "arm,arm11mpcore-pmu",   .data = armv6mpcore_pmu_init},
 562         {.compatible = "arm,arm1176-pmu",       .data = armv6_1176_pmu_init},
 563         {.compatible = "arm,arm1136-pmu",       .data = armv6_1136_pmu_init},
 564         { /* sentinel value */ }
 565 };
 566 
 567 static const struct pmu_probe_info armv6_pmu_probe_table[] = {
 568         ARM_PMU_PROBE(ARM_CPU_PART_ARM1136, armv6_1136_pmu_init),
 569         ARM_PMU_PROBE(ARM_CPU_PART_ARM1156, armv6_1156_pmu_init),
 570         ARM_PMU_PROBE(ARM_CPU_PART_ARM1176, armv6_1176_pmu_init),
 571         ARM_PMU_PROBE(ARM_CPU_PART_ARM11MPCORE, armv6mpcore_pmu_init),
 572         { /* sentinel value */ }
 573 };
 574 
 575 static int armv6_pmu_device_probe(struct platform_device *pdev)
 576 {
 577         return arm_pmu_device_probe(pdev, armv6_pmu_of_device_ids,
 578                                     armv6_pmu_probe_table);
 579 }
 580 
 581 static struct platform_driver armv6_pmu_driver = {
 582         .driver         = {
 583                 .name   = "armv6-pmu",
 584                 .of_match_table = armv6_pmu_of_device_ids,
 585         },
 586         .probe          = armv6_pmu_device_probe,
 587 };
 588 
 589 builtin_platform_driver(armv6_pmu_driver);
 590 #endif  /* CONFIG_CPU_V6 || CONFIG_CPU_V6K */
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root/arch/arm/kernel/perf_event_v6.c

DEFINITIONS
