#undef DEBUG /* * ARM performance counter support. * * Copyright (C) 2009 picoChip Designs, Ltd., Jamie Iles * * ARMv7 support: Jean Pihet * 2010 (c) MontaVista Software, LLC. * * This code is based on the sparc64 perf event code, which is in turn based * on the x86 code. Callchain code is based on the ARM OProfile backtrace * code. */ #define pr_fmt(fmt) "hw perfevents: " fmt #include #include #include #include #include #include #include #include #include #include #include static struct platform_device *pmu_device; /* * Hardware lock to serialize accesses to PMU registers. Needed for the * read/modify/write sequences. */ DEFINE_SPINLOCK(pmu_lock); /* * ARMv6 supports a maximum of 3 events, starting from index 1. If we add * another platform that supports more, we need to increase this to be the * largest of all platforms. * * ARMv7 supports up to 32 events: * cycle counter CCNT + 31 events counters CNT0..30. * Cortex-A8 has 1+4 counters, Cortex-A9 has 1+6 counters. */ #define ARMPMU_MAX_HWEVENTS 33 /* The events for a given CPU. */ struct cpu_hw_events { /* * The events that are active on the CPU for the given index. Index 0 * is reserved. */ struct perf_event *events[ARMPMU_MAX_HWEVENTS]; /* * A 1 bit for an index indicates that the counter is being used for * an event. A 0 means that the counter can be used. */ unsigned long used_mask[BITS_TO_LONGS(ARMPMU_MAX_HWEVENTS)]; /* * A 1 bit for an index indicates that the counter is actively being * used. */ unsigned long active_mask[BITS_TO_LONGS(ARMPMU_MAX_HWEVENTS)]; }; DEFINE_PER_CPU(struct cpu_hw_events, cpu_hw_events); struct arm_pmu { char *name; irqreturn_t (*handle_irq)(int irq_num, void *dev); void (*enable)(struct hw_perf_event *evt, int idx); void (*disable)(struct hw_perf_event *evt, int idx); int (*event_map)(int evt); u64 (*raw_event)(u64); int (*get_event_idx)(struct cpu_hw_events *cpuc, struct hw_perf_event *hwc); u32 (*read_counter)(int idx); void (*write_counter)(int idx, u32 val); void (*start)(void); void (*stop)(void); int num_events; u64 max_period; }; /* Set at runtime when we know what CPU type we are. */ static const struct arm_pmu *armpmu; #define HW_OP_UNSUPPORTED 0xFFFF #define C(_x) \ PERF_COUNT_HW_CACHE_##_x #define CACHE_OP_UNSUPPORTED 0xFFFF static unsigned armpmu_perf_cache_map[PERF_COUNT_HW_CACHE_MAX] [PERF_COUNT_HW_CACHE_OP_MAX] [PERF_COUNT_HW_CACHE_RESULT_MAX]; static int armpmu_map_cache_event(u64 config) { unsigned int cache_type, cache_op, cache_result, ret; cache_type = (config >> 0) & 0xff; if (cache_type >= PERF_COUNT_HW_CACHE_MAX) return -EINVAL; cache_op = (config >> 8) & 0xff; if (cache_op >= PERF_COUNT_HW_CACHE_OP_MAX) return -EINVAL; cache_result = (config >> 16) & 0xff; if (cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX) return -EINVAL; ret = (int)armpmu_perf_cache_map[cache_type][cache_op][cache_result]; if (ret == CACHE_OP_UNSUPPORTED) return -ENOENT; return ret; } static int armpmu_event_set_period(struct perf_event *event, struct hw_perf_event *hwc, int idx) { s64 left = atomic64_read(&hwc->period_left); s64 period = hwc->sample_period; int ret = 0; if (unlikely(left <= -period)) { left = period; atomic64_set(&hwc->period_left, left); hwc->last_period = period; ret = 1; } if (unlikely(left <= 0)) { left += period; atomic64_set(&hwc->period_left, left); hwc->last_period = period; ret = 1; } if (left > (s64)armpmu->max_period) left = armpmu->max_period; atomic64_set(&hwc->prev_count, (u64)-left); armpmu->write_counter(idx, (u64)(-left) & 0xffffffff); perf_event_update_userpage(event); return ret; } static u64 armpmu_event_update(struct perf_event *event, struct hw_perf_event *hwc, int idx) { int shift = 64 - 32; s64 prev_raw_count, new_raw_count; s64 delta; again: prev_raw_count = atomic64_read(&hwc->prev_count); new_raw_count = armpmu->read_counter(idx); if (atomic64_cmpxchg(&hwc->prev_count, prev_raw_count, new_raw_count) != prev_raw_count) goto again; delta = (new_raw_count << shift) - (prev_raw_count << shift); delta >>= shift; atomic64_add(delta, &event->count); atomic64_sub(delta, &hwc->period_left); return new_raw_count; } static void armpmu_disable(struct perf_event *event) { struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events); struct hw_perf_event *hwc = &event->hw; int idx = hwc->idx; WARN_ON(idx < 0); clear_bit(idx, cpuc->active_mask); armpmu->disable(hwc, idx); barrier(); armpmu_event_update(event, hwc, idx); cpuc->events[idx] = NULL; clear_bit(idx, cpuc->used_mask); perf_event_update_userpage(event); } static void armpmu_read(struct perf_event *event) { struct hw_perf_event *hwc = &event->hw; /* Don't read disabled counters! */ if (hwc->idx < 0) return; armpmu_event_update(event, hwc, hwc->idx); } static void armpmu_unthrottle(struct perf_event *event) { struct hw_perf_event *hwc = &event->hw; /* * Set the period again. Some counters can't be stopped, so when we * were throttled we simply disabled the IRQ source and the counter * may have been left counting. If we don't do this step then we may * get an interrupt too soon or *way* too late if the overflow has * happened since disabling. */ armpmu_event_set_period(event, hwc, hwc->idx); armpmu->enable(hwc, hwc->idx); } static int armpmu_enable(struct perf_event *event) { struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events); struct hw_perf_event *hwc = &event->hw; int idx; int err = 0; /* If we don't have a space for the counter then finish early. */ idx = armpmu->get_event_idx(cpuc, hwc); if (idx < 0) { err = idx; goto out; } /* * If there is an event in the counter we are going to use then make * sure it is disabled. */ event->hw.idx = idx; armpmu->disable(hwc, idx); cpuc->events[idx] = event; set_bit(idx, cpuc->active_mask); /* Set the period for the event. */ armpmu_event_set_period(event, hwc, idx); /* Enable the event. */ armpmu->enable(hwc, idx); /* Propagate our changes to the userspace mapping. */ perf_event_update_userpage(event); out: return err; } static struct pmu pmu = { .enable = armpmu_enable, .disable = armpmu_disable, .unthrottle = armpmu_unthrottle, .read = armpmu_read, }; static int validate_event(struct cpu_hw_events *cpuc, struct perf_event *event) { struct hw_perf_event fake_event = event->hw; if (event->pmu && event->pmu != &pmu) return 0; return armpmu->get_event_idx(cpuc, &fake_event) >= 0; } static int validate_group(struct perf_event *event) { struct perf_event *sibling, *leader = event->group_leader; struct cpu_hw_events fake_pmu; memset(&fake_pmu, 0, sizeof(fake_pmu)); if (!validate_event(&fake_pmu, leader)) return -ENOSPC; list_for_each_entry(sibling, &leader->sibling_list, group_entry) { if (!validate_event(&fake_pmu, sibling)) return -ENOSPC; } if (!validate_event(&fake_pmu, event)) return -ENOSPC; return 0; } static int armpmu_reserve_hardware(void) { int i, err = -ENODEV, irq; pmu_device = reserve_pmu(ARM_PMU_DEVICE_CPU); if (IS_ERR(pmu_device)) { pr_warning("unable to reserve pmu\n"); return PTR_ERR(pmu_device); } init_pmu(ARM_PMU_DEVICE_CPU); if (pmu_device->num_resources < 1) { pr_err("no irqs for PMUs defined\n"); return -ENODEV; } for (i = 0; i < pmu_device->num_resources; ++i) { irq = platform_get_irq(pmu_device, i); if (irq < 0) continue; err = request_irq(irq, armpmu->handle_irq, IRQF_DISABLED | IRQF_NOBALANCING, "armpmu", NULL); if (err) { pr_warning("unable to request IRQ%d for ARM perf " "counters\n", irq); break; } } if (err) { for (i = i - 1; i >= 0; --i) { irq = platform_get_irq(pmu_device, i); if (irq >= 0) free_irq(irq, NULL); } release_pmu(pmu_device); pmu_device = NULL; } return err; } static void armpmu_release_hardware(void) { int i, irq; for (i = pmu_device->num_resources - 1; i >= 0; --i) { irq = platform_get_irq(pmu_device, i); if (irq >= 0) free_irq(irq, NULL); } armpmu->stop(); release_pmu(pmu_device); pmu_device = NULL; } static atomic_t active_events = ATOMIC_INIT(0); static DEFINE_MUTEX(pmu_reserve_mutex); static void hw_perf_event_destroy(struct perf_event *event) { if (atomic_dec_and_mutex_lock(&active_events, &pmu_reserve_mutex)) { armpmu_release_hardware(); mutex_unlock(&pmu_reserve_mutex); } } static int __hw_perf_event_init(struct perf_event *event) { struct hw_perf_event *hwc = &event->hw; int mapping, err; /* Decode the generic type into an ARM event identifier. */ if (PERF_TYPE_HARDWARE == event->attr.type) { mapping = armpmu->event_map(event->attr.config); } else if (PERF_TYPE_HW_CACHE == event->attr.type) { mapping = armpmu_map_cache_event(event->attr.config); } else if (PERF_TYPE_RAW == event->attr.type) { mapping = armpmu->raw_event(event->attr.config); } else { pr_debug("event type %x not supported\n", event->attr.type); return -EOPNOTSUPP; } if (mapping < 0) { pr_debug("event %x:%llx not supported\n", event->attr.type, event->attr.config); return mapping; } /* * Check whether we need to exclude the counter from certain modes. * The ARM performance counters are on all of the time so if someone * has asked us for some excludes then we have to fail. */ if (event->attr.exclude_kernel || event->attr.exclude_user || event->attr.exclude_hv || event->attr.exclude_idle) { pr_debug("ARM performance counters do not support " "mode exclusion\n"); return -EPERM; } /* * We don't assign an index until we actually place the event onto * hardware. Use -1 to signify that we haven't decided where to put it * yet. For SMP systems, each core has it's own PMU so we can't do any * clever allocation or constraints checking at this point. */ hwc->idx = -1; /* * Store the event encoding into the config_base field. config and * event_base are unused as the only 2 things we need to know are * the event mapping and the counter to use. The counter to use is * also the indx and the config_base is the event type. */ hwc->config_base = (unsigned long)mapping; hwc->config = 0; hwc->event_base = 0; if (!hwc->sample_period) { hwc->sample_period = armpmu->max_period; hwc->last_period = hwc->sample_period; atomic64_set(&hwc->period_left, hwc->sample_period); } err = 0; if (event->group_leader != event) { err = validate_group(event); if (err) return -EINVAL; } return err; } const struct pmu * hw_perf_event_init(struct perf_event *event) { int err = 0; if (!armpmu) return ERR_PTR(-ENODEV); event->destroy = hw_perf_event_destroy; if (!atomic_inc_not_zero(&active_events)) { if (atomic_read(&active_events) > perf_max_events) { atomic_dec(&active_events); return ERR_PTR(-ENOSPC); } mutex_lock(&pmu_reserve_mutex); if (atomic_read(&active_events) == 0) { err = armpmu_reserve_hardware(); } if (!err) atomic_inc(&active_events); mutex_unlock(&pmu_reserve_mutex); } if (err) return ERR_PTR(err); err = __hw_perf_event_init(event); if (err) hw_perf_event_destroy(event); return err ? ERR_PTR(err) : &pmu; } void hw_perf_enable(void) { /* Enable all of the perf events on hardware. */ int idx; struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events); if (!armpmu) return; for (idx = 0; idx <= armpmu->num_events; ++idx) { struct perf_event *event = cpuc->events[idx]; if (!event) continue; armpmu->enable(&event->hw, idx); } armpmu->start(); } void hw_perf_disable(void) { if (armpmu) armpmu->stop(); } /* * ARMv6 Performance counter handling code. * * ARMv6 has 2 configurable performance counters and a single cycle counter. * They all share a single reset bit but can be written to zero so we can use * that for a reset. * * The counters can't be individually enabled or disabled so when we remove * one event and replace it with another we could get spurious counts from the * wrong event. However, we can take advantage of the fact that the * performance counters can export events to the event bus, and the event bus * itself can be monitored. This requires that we *don't* export the events to * the event bus. The procedure for disabling a configurable counter is: * - change the counter to count the ETMEXTOUT[0] signal (0x20). This * effectively stops the counter from counting. * - disable the counter's interrupt generation (each counter has it's * own interrupt enable bit). * Once stopped, the counter value can be written as 0 to reset. * * To enable a counter: * - enable the counter's interrupt generation. * - set the new event type. * * Note: the dedicated cycle counter only counts cycles and can't be * enabled/disabled independently of the others. When we want to disable the * cycle counter, we have to just disable the interrupt reporting and start * ignoring that counter. When re-enabling, we have to reset the value and * enable the interrupt. */ enum armv6_perf_types { ARMV6_PERFCTR_ICACHE_MISS = 0x0, ARMV6_PERFCTR_IBUF_STALL = 0x1, ARMV6_PERFCTR_DDEP_STALL = 0x2, ARMV6_PERFCTR_ITLB_MISS = 0x3, ARMV6_PERFCTR_DTLB_MISS = 0x4, ARMV6_PERFCTR_BR_EXEC = 0x5, ARMV6_PERFCTR_BR_MISPREDICT = 0x6, ARMV6_PERFCTR_INSTR_EXEC = 0x7, ARMV6_PERFCTR_DCACHE_HIT = 0x9, ARMV6_PERFCTR_DCACHE_ACCESS = 0xA, ARMV6_PERFCTR_DCACHE_MISS = 0xB, ARMV6_PERFCTR_DCACHE_WBACK = 0xC, ARMV6_PERFCTR_SW_PC_CHANGE = 0xD, ARMV6_PERFCTR_MAIN_TLB_MISS = 0xF, ARMV6_PERFCTR_EXPL_D_ACCESS = 0x10, ARMV6_PERFCTR_LSU_FULL_STALL = 0x11, ARMV6_PERFCTR_WBUF_DRAINED = 0x12, ARMV6_PERFCTR_CPU_CYCLES = 0xFF, ARMV6_PERFCTR_NOP = 0x20, }; enum armv6_counters { ARMV6_CYCLE_COUNTER = 1, ARMV6_COUNTER0, ARMV6_COUNTER1, }; /* * The hardware events that we support. We do support cache operations but * we have harvard caches and no way to combine instruction and data * accesses/misses in hardware. */ static const unsigned armv6_perf_map[PERF_COUNT_HW_MAX] = { [PERF_COUNT_HW_CPU_CYCLES] = ARMV6_PERFCTR_CPU_CYCLES, [PERF_COUNT_HW_INSTRUCTIONS] = ARMV6_PERFCTR_INSTR_EXEC, [PERF_COUNT_HW_CACHE_REFERENCES] = HW_OP_UNSUPPORTED, [PERF_COUNT_HW_CACHE_MISSES] = HW_OP_UNSUPPORTED, [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = ARMV6_PERFCTR_BR_EXEC, [PERF_COUNT_HW_BRANCH_MISSES] = ARMV6_PERFCTR_BR_MISPREDICT, [PERF_COUNT_HW_BUS_CYCLES] = HW_OP_UNSUPPORTED, }; static const unsigned armv6_perf_cache_map[PERF_COUNT_HW_CACHE_MAX] [PERF_COUNT_HW_CACHE_OP_MAX] [PERF_COUNT_HW_CACHE_RESULT_MAX] = { [C(L1D)] = { /* * The performance counters don't differentiate between read * and write accesses/misses so this isn't strictly correct, * but it's the best we can do. Writes and reads get * combined. */ [C(OP_READ)] = { [C(RESULT_ACCESS)] = ARMV6_PERFCTR_DCACHE_ACCESS, [C(RESULT_MISS)] = ARMV6_PERFCTR_DCACHE_MISS, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = ARMV6_PERFCTR_DCACHE_ACCESS, [C(RESULT_MISS)] = ARMV6_PERFCTR_DCACHE_MISS, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, [C(L1I)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV6_PERFCTR_ICACHE_MISS, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV6_PERFCTR_ICACHE_MISS, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, [C(LL)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, [C(DTLB)] = { /* * The ARM performance counters can count micro DTLB misses, * micro ITLB misses and main TLB misses. There isn't an event * for TLB misses, so use the micro misses here and if users * want the main TLB misses they can use a raw counter. */ [C(OP_READ)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV6_PERFCTR_DTLB_MISS, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV6_PERFCTR_DTLB_MISS, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, [C(ITLB)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV6_PERFCTR_ITLB_MISS, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV6_PERFCTR_ITLB_MISS, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, [C(BPU)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, }; enum armv6mpcore_perf_types { ARMV6MPCORE_PERFCTR_ICACHE_MISS = 0x0, ARMV6MPCORE_PERFCTR_IBUF_STALL = 0x1, ARMV6MPCORE_PERFCTR_DDEP_STALL = 0x2, ARMV6MPCORE_PERFCTR_ITLB_MISS = 0x3, ARMV6MPCORE_PERFCTR_DTLB_MISS = 0x4, ARMV6MPCORE_PERFCTR_BR_EXEC = 0x5, ARMV6MPCORE_PERFCTR_BR_NOTPREDICT = 0x6, ARMV6MPCORE_PERFCTR_BR_MISPREDICT = 0x7, ARMV6MPCORE_PERFCTR_INSTR_EXEC = 0x8, ARMV6MPCORE_PERFCTR_DCACHE_RDACCESS = 0xA, ARMV6MPCORE_PERFCTR_DCACHE_RDMISS = 0xB, ARMV6MPCORE_PERFCTR_DCACHE_WRACCESS = 0xC, ARMV6MPCORE_PERFCTR_DCACHE_WRMISS = 0xD, ARMV6MPCORE_PERFCTR_DCACHE_EVICTION = 0xE, ARMV6MPCORE_PERFCTR_SW_PC_CHANGE = 0xF, ARMV6MPCORE_PERFCTR_MAIN_TLB_MISS = 0x10, ARMV6MPCORE_PERFCTR_EXPL_MEM_ACCESS = 0x11, ARMV6MPCORE_PERFCTR_LSU_FULL_STALL = 0x12, ARMV6MPCORE_PERFCTR_WBUF_DRAINED = 0x13, ARMV6MPCORE_PERFCTR_CPU_CYCLES = 0xFF, }; /* * The hardware events that we support. We do support cache operations but * we have harvard caches and no way to combine instruction and data * accesses/misses in hardware. */ static const unsigned armv6mpcore_perf_map[PERF_COUNT_HW_MAX] = { [PERF_COUNT_HW_CPU_CYCLES] = ARMV6MPCORE_PERFCTR_CPU_CYCLES, [PERF_COUNT_HW_INSTRUCTIONS] = ARMV6MPCORE_PERFCTR_INSTR_EXEC, [PERF_COUNT_HW_CACHE_REFERENCES] = HW_OP_UNSUPPORTED, [PERF_COUNT_HW_CACHE_MISSES] = HW_OP_UNSUPPORTED, [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = ARMV6MPCORE_PERFCTR_BR_EXEC, [PERF_COUNT_HW_BRANCH_MISSES] = ARMV6MPCORE_PERFCTR_BR_MISPREDICT, [PERF_COUNT_HW_BUS_CYCLES] = HW_OP_UNSUPPORTED, }; static const unsigned armv6mpcore_perf_cache_map[PERF_COUNT_HW_CACHE_MAX] [PERF_COUNT_HW_CACHE_OP_MAX] [PERF_COUNT_HW_CACHE_RESULT_MAX] = { [C(L1D)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = ARMV6MPCORE_PERFCTR_DCACHE_RDACCESS, [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_DCACHE_RDMISS, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = ARMV6MPCORE_PERFCTR_DCACHE_WRACCESS, [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_DCACHE_WRMISS, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, [C(L1I)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_ICACHE_MISS, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_ICACHE_MISS, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, [C(LL)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, [C(DTLB)] = { /* * The ARM performance counters can count micro DTLB misses, * micro ITLB misses and main TLB misses. There isn't an event * for TLB misses, so use the micro misses here and if users * want the main TLB misses they can use a raw counter. */ [C(OP_READ)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_DTLB_MISS, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_DTLB_MISS, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, [C(ITLB)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_ITLB_MISS, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_ITLB_MISS, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, [C(BPU)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, }; static inline unsigned long armv6_pmcr_read(void) { u32 val; asm volatile("mrc p15, 0, %0, c15, c12, 0" : "=r"(val)); return val; } static inline void armv6_pmcr_write(unsigned long val) { asm volatile("mcr p15, 0, %0, c15, c12, 0" : : "r"(val)); } #define ARMV6_PMCR_ENABLE (1 << 0) #define ARMV6_PMCR_CTR01_RESET (1 << 1) #define ARMV6_PMCR_CCOUNT_RESET (1 << 2) #define ARMV6_PMCR_CCOUNT_DIV (1 << 3) #define ARMV6_PMCR_COUNT0_IEN (1 << 4) #define ARMV6_PMCR_COUNT1_IEN (1 << 5) #define ARMV6_PMCR_CCOUNT_IEN (1 << 6) #define ARMV6_PMCR_COUNT0_OVERFLOW (1 << 8) #define ARMV6_PMCR_COUNT1_OVERFLOW (1 << 9) #define ARMV6_PMCR_CCOUNT_OVERFLOW (1 << 10) #define ARMV6_PMCR_EVT_COUNT0_SHIFT 20 #define ARMV6_PMCR_EVT_COUNT0_MASK (0xFF << ARMV6_PMCR_EVT_COUNT0_SHIFT) #define ARMV6_PMCR_EVT_COUNT1_SHIFT 12 #define ARMV6_PMCR_EVT_COUNT1_MASK (0xFF << ARMV6_PMCR_EVT_COUNT1_SHIFT) #define ARMV6_PMCR_OVERFLOWED_MASK \ (ARMV6_PMCR_COUNT0_OVERFLOW | ARMV6_PMCR_COUNT1_OVERFLOW | \ ARMV6_PMCR_CCOUNT_OVERFLOW) static inline int armv6_pmcr_has_overflowed(unsigned long pmcr) { return (pmcr & ARMV6_PMCR_OVERFLOWED_MASK); } static inline int armv6_pmcr_counter_has_overflowed(unsigned long pmcr, enum armv6_counters counter) { int ret = 0; if (ARMV6_CYCLE_COUNTER == counter) ret = pmcr & ARMV6_PMCR_CCOUNT_OVERFLOW; else if (ARMV6_COUNTER0 == counter) ret = pmcr & ARMV6_PMCR_COUNT0_OVERFLOW; else if (ARMV6_COUNTER1 == counter) ret = pmcr & ARMV6_PMCR_COUNT1_OVERFLOW; else WARN_ONCE(1, "invalid counter number (%d)\n", counter); return ret; } static inline u32 armv6pmu_read_counter(int counter) { unsigned long value = 0; if (ARMV6_CYCLE_COUNTER == counter) asm volatile("mrc p15, 0, %0, c15, c12, 1" : "=r"(value)); else if (ARMV6_COUNTER0 == counter) asm volatile("mrc p15, 0, %0, c15, c12, 2" : "=r"(value)); else if (ARMV6_COUNTER1 == counter) asm volatile("mrc p15, 0, %0, c15, c12, 3" : "=r"(value)); else WARN_ONCE(1, "invalid counter number (%d)\n", counter); return value; } static inline void armv6pmu_write_counter(int counter, u32 value) { if (ARMV6_CYCLE_COUNTER == counter) asm volatile("mcr p15, 0, %0, c15, c12, 1" : : "r"(value)); else if (ARMV6_COUNTER0 == counter) asm volatile("mcr p15, 0, %0, c15, c12, 2" : : "r"(value)); else if (ARMV6_COUNTER1 == counter) asm volatile("mcr p15, 0, %0, c15, c12, 3" : : "r"(value)); else WARN_ONCE(1, "invalid counter number (%d)\n", counter); } void armv6pmu_enable_event(struct hw_perf_event *hwc, int idx) { unsigned long val, mask, evt, flags; if (ARMV6_CYCLE_COUNTER == idx) { mask = 0; evt = ARMV6_PMCR_CCOUNT_IEN; } else if (ARMV6_COUNTER0 == idx) { mask = ARMV6_PMCR_EVT_COUNT0_MASK; evt = (hwc->config_base << ARMV6_PMCR_EVT_COUNT0_SHIFT) | ARMV6_PMCR_COUNT0_IEN; } else if (ARMV6_COUNTER1 == idx) { mask = ARMV6_PMCR_EVT_COUNT1_MASK; evt = (hwc->config_base << ARMV6_PMCR_EVT_COUNT1_SHIFT) | ARMV6_PMCR_COUNT1_IEN; } else { WARN_ONCE(1, "invalid counter number (%d)\n", idx); return; } /* * Mask out the current event and set the counter to count the event * that we're interested in. */ spin_lock_irqsave(&pmu_lock, flags); val = armv6_pmcr_read(); val &= ~mask; val |= evt; armv6_pmcr_write(val); spin_unlock_irqrestore(&pmu_lock, flags); } static irqreturn_t armv6pmu_handle_irq(int irq_num, void *dev) { unsigned long pmcr = armv6_pmcr_read(); struct perf_sample_data data; struct cpu_hw_events *cpuc; struct pt_regs *regs; int idx; if (!armv6_pmcr_has_overflowed(pmcr)) return IRQ_NONE; regs = get_irq_regs(); /* * The interrupts are cleared by writing the overflow flags back to * the control register. All of the other bits don't have any effect * if they are rewritten, so write the whole value back. */ armv6_pmcr_write(pmcr); perf_sample_data_init(&data, 0); cpuc = &__get_cpu_var(cpu_hw_events); for (idx = 0; idx <= armpmu->num_events; ++idx) { struct perf_event *event = cpuc->events[idx]; struct hw_perf_event *hwc; if (!test_bit(idx, cpuc->active_mask)) continue; /* * We have a single interrupt for all counters. Check that * each counter has overflowed before we process it. */ if (!armv6_pmcr_counter_has_overflowed(pmcr, idx)) continue; hwc = &event->hw; armpmu_event_update(event, hwc, idx); data.period = event->hw.last_period; if (!armpmu_event_set_period(event, hwc, idx)) continue; if (perf_event_overflow(event, 0, &data, regs)) armpmu->disable(hwc, idx); } /* * Handle the pending perf events. * * Note: this call *must* be run with interrupts enabled. For * platforms that can have the PMU interrupts raised as a PMI, this * will not work. */ perf_event_do_pending(); return IRQ_HANDLED; } static void armv6pmu_start(void) { unsigned long flags, val; spin_lock_irqsave(&pmu_lock, flags); val = armv6_pmcr_read(); val |= ARMV6_PMCR_ENABLE; armv6_pmcr_write(val); spin_unlock_irqrestore(&pmu_lock, flags); } void armv6pmu_stop(void) { unsigned long flags, val; spin_lock_irqsave(&pmu_lock, flags); val = armv6_pmcr_read(); val &= ~ARMV6_PMCR_ENABLE; armv6_pmcr_write(val); spin_unlock_irqrestore(&pmu_lock, flags); } static inline int armv6pmu_event_map(int config) { int mapping = armv6_perf_map[config]; if (HW_OP_UNSUPPORTED == mapping) mapping = -EOPNOTSUPP; return mapping; } static inline int armv6mpcore_pmu_event_map(int config) { int mapping = armv6mpcore_perf_map[config]; if (HW_OP_UNSUPPORTED == mapping) mapping = -EOPNOTSUPP; return mapping; } static u64 armv6pmu_raw_event(u64 config) { return config & 0xff; } static int armv6pmu_get_event_idx(struct cpu_hw_events *cpuc, struct hw_perf_event *event) { /* Always place a cycle counter into the cycle counter. */ if (ARMV6_PERFCTR_CPU_CYCLES == event->config_base) { if (test_and_set_bit(ARMV6_CYCLE_COUNTER, cpuc->used_mask)) return -EAGAIN; return ARMV6_CYCLE_COUNTER; } else { /* * For anything other than a cycle counter, try and use * counter0 and counter1. */ if (!test_and_set_bit(ARMV6_COUNTER1, cpuc->used_mask)) { return ARMV6_COUNTER1; } if (!test_and_set_bit(ARMV6_COUNTER0, cpuc->used_mask)) { return ARMV6_COUNTER0; } /* The counters are all in use. */ return -EAGAIN; } } static void armv6pmu_disable_event(struct hw_perf_event *hwc, int idx) { unsigned long val, mask, evt, flags; if (ARMV6_CYCLE_COUNTER == idx) { mask = ARMV6_PMCR_CCOUNT_IEN; evt = 0; } else if (ARMV6_COUNTER0 == idx) { mask = ARMV6_PMCR_COUNT0_IEN | ARMV6_PMCR_EVT_COUNT0_MASK; evt = ARMV6_PERFCTR_NOP << ARMV6_PMCR_EVT_COUNT0_SHIFT; } else if (ARMV6_COUNTER1 == idx) { mask = ARMV6_PMCR_COUNT1_IEN | ARMV6_PMCR_EVT_COUNT1_MASK; evt = ARMV6_PERFCTR_NOP << ARMV6_PMCR_EVT_COUNT1_SHIFT; } else { WARN_ONCE(1, "invalid counter number (%d)\n", idx); return; } /* * Mask out the current event and set the counter to count the number * of ETM bus signal assertion cycles. The external reporting should * be disabled and so this should never increment. */ spin_lock_irqsave(&pmu_lock, flags); val = armv6_pmcr_read(); val &= ~mask; val |= evt; armv6_pmcr_write(val); spin_unlock_irqrestore(&pmu_lock, flags); } static void armv6mpcore_pmu_disable_event(struct hw_perf_event *hwc, int idx) { unsigned long val, mask, flags, evt = 0; if (ARMV6_CYCLE_COUNTER == idx) { mask = ARMV6_PMCR_CCOUNT_IEN; } else if (ARMV6_COUNTER0 == idx) { mask = ARMV6_PMCR_COUNT0_IEN; } else if (ARMV6_COUNTER1 == idx) { mask = ARMV6_PMCR_COUNT1_IEN; } else { WARN_ONCE(1, "invalid counter number (%d)\n", idx); return; } /* * Unlike UP ARMv6, we don't have a way of stopping the counters. We * simply disable the interrupt reporting. */ spin_lock_irqsave(&pmu_lock, flags); val = armv6_pmcr_read(); val &= ~mask; val |= evt; armv6_pmcr_write(val); spin_unlock_irqrestore(&pmu_lock, flags); } static const struct arm_pmu armv6pmu = { .name = "v6", .handle_irq = armv6pmu_handle_irq, .enable = armv6pmu_enable_event, .disable = armv6pmu_disable_event, .event_map = armv6pmu_event_map, .raw_event = armv6pmu_raw_event, .read_counter = armv6pmu_read_counter, .write_counter = armv6pmu_write_counter, .get_event_idx = armv6pmu_get_event_idx, .start = armv6pmu_start, .stop = armv6pmu_stop, .num_events = 3, .max_period = (1LLU << 32) - 1, }; /* * ARMv6mpcore is almost identical to single core ARMv6 with the exception * that some of the events have different enumerations and that there is no * *hack* to stop the programmable counters. To stop the counters we simply * disable the interrupt reporting and update the event. When unthrottling we * reset the period and enable the interrupt reporting. */ static const struct arm_pmu armv6mpcore_pmu = { .name = "v6mpcore", .handle_irq = armv6pmu_handle_irq, .enable = armv6pmu_enable_event, .disable = armv6mpcore_pmu_disable_event, .event_map = armv6mpcore_pmu_event_map, .raw_event = armv6pmu_raw_event, .read_counter = armv6pmu_read_counter, .write_counter = armv6pmu_write_counter, .get_event_idx = armv6pmu_get_event_idx, .start = armv6pmu_start, .stop = armv6pmu_stop, .num_events = 3, .max_period = (1LLU << 32) - 1, }; /* * ARMv7 Cortex-A8 and Cortex-A9 Performance Events handling code. * * Copied from ARMv6 code, with the low level code inspired * by the ARMv7 Oprofile code. * * Cortex-A8 has up to 4 configurable performance counters and * a single cycle counter. * Cortex-A9 has up to 31 configurable performance counters and * a single cycle counter. * * All counters can be enabled/disabled and IRQ masked separately. The cycle * counter and all 4 performance counters together can be reset separately. */ #define ARMV7_PMU_CORTEX_A8_NAME "ARMv7 Cortex-A8" #define ARMV7_PMU_CORTEX_A9_NAME "ARMv7 Cortex-A9" /* Common ARMv7 event types */ enum armv7_perf_types { ARMV7_PERFCTR_PMNC_SW_INCR = 0x00, ARMV7_PERFCTR_IFETCH_MISS = 0x01, ARMV7_PERFCTR_ITLB_MISS = 0x02, ARMV7_PERFCTR_DCACHE_REFILL = 0x03, ARMV7_PERFCTR_DCACHE_ACCESS = 0x04, ARMV7_PERFCTR_DTLB_REFILL = 0x05, ARMV7_PERFCTR_DREAD = 0x06, ARMV7_PERFCTR_DWRITE = 0x07, ARMV7_PERFCTR_EXC_TAKEN = 0x09, ARMV7_PERFCTR_EXC_EXECUTED = 0x0A, ARMV7_PERFCTR_CID_WRITE = 0x0B, /* ARMV7_PERFCTR_PC_WRITE is equivalent to HW_BRANCH_INSTRUCTIONS. * It counts: * - all branch instructions, * - instructions that explicitly write the PC, * - exception generating instructions. */ ARMV7_PERFCTR_PC_WRITE = 0x0C, ARMV7_PERFCTR_PC_IMM_BRANCH = 0x0D, ARMV7_PERFCTR_UNALIGNED_ACCESS = 0x0F, ARMV7_PERFCTR_PC_BRANCH_MIS_PRED = 0x10, ARMV7_PERFCTR_CLOCK_CYCLES = 0x11, ARMV7_PERFCTR_PC_BRANCH_MIS_USED = 0x12, ARMV7_PERFCTR_CPU_CYCLES = 0xFF }; /* ARMv7 Cortex-A8 specific event types */ enum armv7_a8_perf_types { ARMV7_PERFCTR_INSTR_EXECUTED = 0x08, ARMV7_PERFCTR_PC_PROC_RETURN = 0x0E, ARMV7_PERFCTR_WRITE_BUFFER_FULL = 0x40, ARMV7_PERFCTR_L2_STORE_MERGED = 0x41, ARMV7_PERFCTR_L2_STORE_BUFF = 0x42, ARMV7_PERFCTR_L2_ACCESS = 0x43, ARMV7_PERFCTR_L2_CACH_MISS = 0x44, ARMV7_PERFCTR_AXI_READ_CYCLES = 0x45, ARMV7_PERFCTR_AXI_WRITE_CYCLES = 0x46, ARMV7_PERFCTR_MEMORY_REPLAY = 0x47, ARMV7_PERFCTR_UNALIGNED_ACCESS_REPLAY = 0x48, ARMV7_PERFCTR_L1_DATA_MISS = 0x49, ARMV7_PERFCTR_L1_INST_MISS = 0x4A, ARMV7_PERFCTR_L1_DATA_COLORING = 0x4B, ARMV7_PERFCTR_L1_NEON_DATA = 0x4C, ARMV7_PERFCTR_L1_NEON_CACH_DATA = 0x4D, ARMV7_PERFCTR_L2_NEON = 0x4E, ARMV7_PERFCTR_L2_NEON_HIT = 0x4F, ARMV7_PERFCTR_L1_INST = 0x50, ARMV7_PERFCTR_PC_RETURN_MIS_PRED = 0x51, ARMV7_PERFCTR_PC_BRANCH_FAILED = 0x52, ARMV7_PERFCTR_PC_BRANCH_TAKEN = 0x53, ARMV7_PERFCTR_PC_BRANCH_EXECUTED = 0x54, ARMV7_PERFCTR_OP_EXECUTED = 0x55, ARMV7_PERFCTR_CYCLES_INST_STALL = 0x56, ARMV7_PERFCTR_CYCLES_INST = 0x57, ARMV7_PERFCTR_CYCLES_NEON_DATA_STALL = 0x58, ARMV7_PERFCTR_CYCLES_NEON_INST_STALL = 0x59, ARMV7_PERFCTR_NEON_CYCLES = 0x5A, ARMV7_PERFCTR_PMU0_EVENTS = 0x70, ARMV7_PERFCTR_PMU1_EVENTS = 0x71, ARMV7_PERFCTR_PMU_EVENTS = 0x72, }; /* ARMv7 Cortex-A9 specific event types */ enum armv7_a9_perf_types { ARMV7_PERFCTR_JAVA_HW_BYTECODE_EXEC = 0x40, ARMV7_PERFCTR_JAVA_SW_BYTECODE_EXEC = 0x41, ARMV7_PERFCTR_JAZELLE_BRANCH_EXEC = 0x42, ARMV7_PERFCTR_COHERENT_LINE_MISS = 0x50, ARMV7_PERFCTR_COHERENT_LINE_HIT = 0x51, ARMV7_PERFCTR_ICACHE_DEP_STALL_CYCLES = 0x60, ARMV7_PERFCTR_DCACHE_DEP_STALL_CYCLES = 0x61, ARMV7_PERFCTR_TLB_MISS_DEP_STALL_CYCLES = 0x62, ARMV7_PERFCTR_STREX_EXECUTED_PASSED = 0x63, ARMV7_PERFCTR_STREX_EXECUTED_FAILED = 0x64, ARMV7_PERFCTR_DATA_EVICTION = 0x65, ARMV7_PERFCTR_ISSUE_STAGE_NO_INST = 0x66, ARMV7_PERFCTR_ISSUE_STAGE_EMPTY = 0x67, ARMV7_PERFCTR_INST_OUT_OF_RENAME_STAGE = 0x68, ARMV7_PERFCTR_PREDICTABLE_FUNCT_RETURNS = 0x6E, ARMV7_PERFCTR_MAIN_UNIT_EXECUTED_INST = 0x70, ARMV7_PERFCTR_SECOND_UNIT_EXECUTED_INST = 0x71, ARMV7_PERFCTR_LD_ST_UNIT_EXECUTED_INST = 0x72, ARMV7_PERFCTR_FP_EXECUTED_INST = 0x73, ARMV7_PERFCTR_NEON_EXECUTED_INST = 0x74, ARMV7_PERFCTR_PLD_FULL_DEP_STALL_CYCLES = 0x80, ARMV7_PERFCTR_DATA_WR_DEP_STALL_CYCLES = 0x81, ARMV7_PERFCTR_ITLB_MISS_DEP_STALL_CYCLES = 0x82, ARMV7_PERFCTR_DTLB_MISS_DEP_STALL_CYCLES = 0x83, ARMV7_PERFCTR_MICRO_ITLB_MISS_DEP_STALL_CYCLES = 0x84, ARMV7_PERFCTR_MICRO_DTLB_MISS_DEP_STALL_CYCLES = 0x85, ARMV7_PERFCTR_DMB_DEP_STALL_CYCLES = 0x86, ARMV7_PERFCTR_INTGR_CLK_ENABLED_CYCLES = 0x8A, ARMV7_PERFCTR_DATA_ENGINE_CLK_EN_CYCLES = 0x8B, ARMV7_PERFCTR_ISB_INST = 0x90, ARMV7_PERFCTR_DSB_INST = 0x91, ARMV7_PERFCTR_DMB_INST = 0x92, ARMV7_PERFCTR_EXT_INTERRUPTS = 0x93, ARMV7_PERFCTR_PLE_CACHE_LINE_RQST_COMPLETED = 0xA0, ARMV7_PERFCTR_PLE_CACHE_LINE_RQST_SKIPPED = 0xA1, ARMV7_PERFCTR_PLE_FIFO_FLUSH = 0xA2, ARMV7_PERFCTR_PLE_RQST_COMPLETED = 0xA3, ARMV7_PERFCTR_PLE_FIFO_OVERFLOW = 0xA4, ARMV7_PERFCTR_PLE_RQST_PROG = 0xA5 }; /* * Cortex-A8 HW events mapping * * The hardware events that we support. We do support cache operations but * we have harvard caches and no way to combine instruction and data * accesses/misses in hardware. */ static const unsigned armv7_a8_perf_map[PERF_COUNT_HW_MAX] = { [PERF_COUNT_HW_CPU_CYCLES] = ARMV7_PERFCTR_CPU_CYCLES, [PERF_COUNT_HW_INSTRUCTIONS] = ARMV7_PERFCTR_INSTR_EXECUTED, [PERF_COUNT_HW_CACHE_REFERENCES] = HW_OP_UNSUPPORTED, [PERF_COUNT_HW_CACHE_MISSES] = HW_OP_UNSUPPORTED, [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = ARMV7_PERFCTR_PC_WRITE, [PERF_COUNT_HW_BRANCH_MISSES] = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED, [PERF_COUNT_HW_BUS_CYCLES] = ARMV7_PERFCTR_CLOCK_CYCLES, }; static const unsigned armv7_a8_perf_cache_map[PERF_COUNT_HW_CACHE_MAX] [PERF_COUNT_HW_CACHE_OP_MAX] [PERF_COUNT_HW_CACHE_RESULT_MAX] = { [C(L1D)] = { /* * The performance counters don't differentiate between read * and write accesses/misses so this isn't strictly correct, * but it's the best we can do. Writes and reads get * combined. */ [C(OP_READ)] = { [C(RESULT_ACCESS)] = ARMV7_PERFCTR_DCACHE_ACCESS, [C(RESULT_MISS)] = ARMV7_PERFCTR_DCACHE_REFILL, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = ARMV7_PERFCTR_DCACHE_ACCESS, [C(RESULT_MISS)] = ARMV7_PERFCTR_DCACHE_REFILL, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, [C(L1I)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = ARMV7_PERFCTR_L1_INST, [C(RESULT_MISS)] = ARMV7_PERFCTR_L1_INST_MISS, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = ARMV7_PERFCTR_L1_INST, [C(RESULT_MISS)] = ARMV7_PERFCTR_L1_INST_MISS, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, [C(LL)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = ARMV7_PERFCTR_L2_ACCESS, [C(RESULT_MISS)] = ARMV7_PERFCTR_L2_CACH_MISS, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = ARMV7_PERFCTR_L2_ACCESS, [C(RESULT_MISS)] = ARMV7_PERFCTR_L2_CACH_MISS, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, [C(DTLB)] = { /* * Only ITLB misses and DTLB refills are supported. * If users want the DTLB refills misses a raw counter * must be used. */ [C(OP_READ)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV7_PERFCTR_DTLB_REFILL, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV7_PERFCTR_DTLB_REFILL, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, [C(ITLB)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV7_PERFCTR_ITLB_MISS, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV7_PERFCTR_ITLB_MISS, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, [C(BPU)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = ARMV7_PERFCTR_PC_WRITE, [C(RESULT_MISS)] = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = ARMV7_PERFCTR_PC_WRITE, [C(RESULT_MISS)] = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, }; /* * Cortex-A9 HW events mapping */ static const unsigned armv7_a9_perf_map[PERF_COUNT_HW_MAX] = { [PERF_COUNT_HW_CPU_CYCLES] = ARMV7_PERFCTR_CPU_CYCLES, [PERF_COUNT_HW_INSTRUCTIONS] = ARMV7_PERFCTR_INST_OUT_OF_RENAME_STAGE, [PERF_COUNT_HW_CACHE_REFERENCES] = ARMV7_PERFCTR_COHERENT_LINE_HIT, [PERF_COUNT_HW_CACHE_MISSES] = ARMV7_PERFCTR_COHERENT_LINE_MISS, [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = ARMV7_PERFCTR_PC_WRITE, [PERF_COUNT_HW_BRANCH_MISSES] = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED, [PERF_COUNT_HW_BUS_CYCLES] = ARMV7_PERFCTR_CLOCK_CYCLES, }; static const unsigned armv7_a9_perf_cache_map[PERF_COUNT_HW_CACHE_MAX] [PERF_COUNT_HW_CACHE_OP_MAX] [PERF_COUNT_HW_CACHE_RESULT_MAX] = { [C(L1D)] = { /* * The performance counters don't differentiate between read * and write accesses/misses so this isn't strictly correct, * but it's the best we can do. Writes and reads get * combined. */ [C(OP_READ)] = { [C(RESULT_ACCESS)] = ARMV7_PERFCTR_DCACHE_ACCESS, [C(RESULT_MISS)] = ARMV7_PERFCTR_DCACHE_REFILL, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = ARMV7_PERFCTR_DCACHE_ACCESS, [C(RESULT_MISS)] = ARMV7_PERFCTR_DCACHE_REFILL, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, [C(L1I)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV7_PERFCTR_IFETCH_MISS, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV7_PERFCTR_IFETCH_MISS, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, [C(LL)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, [C(DTLB)] = { /* * Only ITLB misses and DTLB refills are supported. * If users want the DTLB refills misses a raw counter * must be used. */ [C(OP_READ)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV7_PERFCTR_DTLB_REFILL, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV7_PERFCTR_DTLB_REFILL, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, [C(ITLB)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV7_PERFCTR_ITLB_MISS, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = ARMV7_PERFCTR_ITLB_MISS, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, [C(BPU)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = ARMV7_PERFCTR_PC_WRITE, [C(RESULT_MISS)] = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = ARMV7_PERFCTR_PC_WRITE, [C(RESULT_MISS)] = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED, [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED, }, }, }; /* * Perf Events counters */ enum armv7_counters { ARMV7_CYCLE_COUNTER = 1, /* Cycle counter */ ARMV7_COUNTER0 = 2, /* First event counter */ }; /* * The cycle counter is ARMV7_CYCLE_COUNTER. * The first event counter is ARMV7_COUNTER0. * The last event counter is (ARMV7_COUNTER0 + armpmu->num_events - 1). */ #define ARMV7_COUNTER_LAST (ARMV7_COUNTER0 + armpmu->num_events - 1) /* * ARMv7 low level PMNC access */ /* * Per-CPU PMNC: config reg */ #define ARMV7_PMNC_E (1 << 0) /* Enable all counters */ #define ARMV7_PMNC_P (1 << 1) /* Reset all counters */ #define ARMV7_PMNC_C (1 << 2) /* Cycle counter reset */ #define ARMV7_PMNC_D (1 << 3) /* CCNT counts every 64th cpu cycle */ #define ARMV7_PMNC_X (1 << 4) /* Export to ETM */ #define ARMV7_PMNC_DP (1 << 5) /* Disable CCNT if non-invasive debug*/ #define ARMV7_PMNC_N_SHIFT 11 /* Number of counters supported */ #define ARMV7_PMNC_N_MASK 0x1f #define ARMV7_PMNC_MASK 0x3f /* Mask for writable bits */ /* * Available counters */ #define ARMV7_CNT0 0 /* First event counter */ #define ARMV7_CCNT 31 /* Cycle counter */ /* Perf Event to low level counters mapping */ #define ARMV7_EVENT_CNT_TO_CNTx (ARMV7_COUNTER0 - ARMV7_CNT0) /* * CNTENS: counters enable reg */ #define ARMV7_CNTENS_P(idx) (1 << (idx - ARMV7_EVENT_CNT_TO_CNTx)) #define ARMV7_CNTENS_C (1 << ARMV7_CCNT) /* * CNTENC: counters disable reg */ #define ARMV7_CNTENC_P(idx) (1 << (idx - ARMV7_EVENT_CNT_TO_CNTx)) #define ARMV7_CNTENC_C (1 << ARMV7_CCNT) /* * INTENS: counters overflow interrupt enable reg */ #define ARMV7_INTENS_P(idx) (1 << (idx - ARMV7_EVENT_CNT_TO_CNTx)) #define ARMV7_INTENS_C (1 << ARMV7_CCNT) /* * INTENC: counters overflow interrupt disable reg */ #define ARMV7_INTENC_P(idx) (1 << (idx - ARMV7_EVENT_CNT_TO_CNTx)) #define ARMV7_INTENC_C (1 << ARMV7_CCNT) /* * EVTSEL: Event selection reg */ #define ARMV7_EVTSEL_MASK 0xff /* Mask for writable bits */ /* * SELECT: Counter selection reg */ #define ARMV7_SELECT_MASK 0x1f /* Mask for writable bits */ /* * FLAG: counters overflow flag status reg */ #define ARMV7_FLAG_P(idx) (1 << (idx - ARMV7_EVENT_CNT_TO_CNTx)) #define ARMV7_FLAG_C (1 << ARMV7_CCNT) #define ARMV7_FLAG_MASK 0xffffffff /* Mask for writable bits */ #define ARMV7_OVERFLOWED_MASK ARMV7_FLAG_MASK static inline unsigned long armv7_pmnc_read(void) { u32 val; asm volatile("mrc p15, 0, %0, c9, c12, 0" : "=r"(val)); return val; } static inline void armv7_pmnc_write(unsigned long val) { val &= ARMV7_PMNC_MASK; asm volatile("mcr p15, 0, %0, c9, c12, 0" : : "r"(val)); } static inline int armv7_pmnc_has_overflowed(unsigned long pmnc) { return pmnc & ARMV7_OVERFLOWED_MASK; } static inline int armv7_pmnc_counter_has_overflowed(unsigned long pmnc, enum armv7_counters counter) { int ret; if (counter == ARMV7_CYCLE_COUNTER) ret = pmnc & ARMV7_FLAG_C; else if ((counter >= ARMV7_COUNTER0) && (counter <= ARMV7_COUNTER_LAST)) ret = pmnc & ARMV7_FLAG_P(counter); else pr_err("CPU%u checking wrong counter %d overflow status\n", smp_processor_id(), counter); return ret; } static inline int armv7_pmnc_select_counter(unsigned int idx) { u32 val; if ((idx < ARMV7_COUNTER0) || (idx > ARMV7_COUNTER_LAST)) { pr_err("CPU%u selecting wrong PMNC counter" " %d\n", smp_processor_id(), idx); return -1; } val = (idx - ARMV7_EVENT_CNT_TO_CNTx) & ARMV7_SELECT_MASK; asm volatile("mcr p15, 0, %0, c9, c12, 5" : : "r" (val)); return idx; } static inline u32 armv7pmu_read_counter(int idx) { unsigned long value = 0; if (idx == ARMV7_CYCLE_COUNTER) asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (value)); else if ((idx >= ARMV7_COUNTER0) && (idx <= ARMV7_COUNTER_LAST)) { if (armv7_pmnc_select_counter(idx) == idx) asm volatile("mrc p15, 0, %0, c9, c13, 2" : "=r" (value)); } else pr_err("CPU%u reading wrong counter %d\n", smp_processor_id(), idx); return value; } static inline void armv7pmu_write_counter(int idx, u32 value) { if (idx == ARMV7_CYCLE_COUNTER) asm volatile("mcr p15, 0, %0, c9, c13, 0" : : "r" (value)); else if ((idx >= ARMV7_COUNTER0) && (idx <= ARMV7_COUNTER_LAST)) { if (armv7_pmnc_select_counter(idx) == idx) asm volatile("mcr p15, 0, %0, c9, c13, 2" : : "r" (value)); } else pr_err("CPU%u writing wrong counter %d\n", smp_processor_id(), idx); } static inline void armv7_pmnc_write_evtsel(unsigned int idx, u32 val) { if (armv7_pmnc_select_counter(idx) == idx) { val &= ARMV7_EVTSEL_MASK; asm volatile("mcr p15, 0, %0, c9, c13, 1" : : "r" (val)); } } static inline u32 armv7_pmnc_enable_counter(unsigned int idx) { u32 val; if ((idx != ARMV7_CYCLE_COUNTER) && ((idx < ARMV7_COUNTER0) || (idx > ARMV7_COUNTER_LAST))) { pr_err("CPU%u enabling wrong PMNC counter" " %d\n", smp_processor_id(), idx); return -1; } if (idx == ARMV7_CYCLE_COUNTER) val = ARMV7_CNTENS_C; else val = ARMV7_CNTENS_P(idx); asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r" (val)); return idx; } static inline u32 armv7_pmnc_disable_counter(unsigned int idx) { u32 val; if ((idx != ARMV7_CYCLE_COUNTER) && ((idx < ARMV7_COUNTER0) || (idx > ARMV7_COUNTER_LAST))) { pr_err("CPU%u disabling wrong PMNC counter" " %d\n", smp_processor_id(), idx); return -1; } if (idx == ARMV7_CYCLE_COUNTER) val = ARMV7_CNTENC_C; else val = ARMV7_CNTENC_P(idx); asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r" (val)); return idx; } static inline u32 armv7_pmnc_enable_intens(unsigned int idx) { u32 val; if ((idx != ARMV7_CYCLE_COUNTER) && ((idx < ARMV7_COUNTER0) || (idx > ARMV7_COUNTER_LAST))) { pr_err("CPU%u enabling wrong PMNC counter" " interrupt enable %d\n", smp_processor_id(), idx); return -1; } if (idx == ARMV7_CYCLE_COUNTER) val = ARMV7_INTENS_C; else val = ARMV7_INTENS_P(idx); asm volatile("mcr p15, 0, %0, c9, c14, 1" : : "r" (val)); return idx; } static inline u32 armv7_pmnc_disable_intens(unsigned int idx) { u32 val; if ((idx != ARMV7_CYCLE_COUNTER) && ((idx < ARMV7_COUNTER0) || (idx > ARMV7_COUNTER_LAST))) { pr_err("CPU%u disabling wrong PMNC counter" " interrupt enable %d\n", smp_processor_id(), idx); return -1; } if (idx == ARMV7_CYCLE_COUNTER) val = ARMV7_INTENC_C; else val = ARMV7_INTENC_P(idx); asm volatile("mcr p15, 0, %0, c9, c14, 2" : : "r" (val)); return idx; } static inline u32 armv7_pmnc_getreset_flags(void) { u32 val; /* Read */ asm volatile("mrc p15, 0, %0, c9, c12, 3" : "=r" (val)); /* Write to clear flags */ val &= ARMV7_FLAG_MASK; asm volatile("mcr p15, 0, %0, c9, c12, 3" : : "r" (val)); return val; } #ifdef DEBUG static void armv7_pmnc_dump_regs(void) { u32 val; unsigned int cnt; printk(KERN_INFO "PMNC registers dump:\n"); asm volatile("mrc p15, 0, %0, c9, c12, 0" : "=r" (val)); printk(KERN_INFO "PMNC =0x%08x\n", val); asm volatile("mrc p15, 0, %0, c9, c12, 1" : "=r" (val)); printk(KERN_INFO "CNTENS=0x%08x\n", val); asm volatile("mrc p15, 0, %0, c9, c14, 1" : "=r" (val)); printk(KERN_INFO "INTENS=0x%08x\n", val); asm volatile("mrc p15, 0, %0, c9, c12, 3" : "=r" (val)); printk(KERN_INFO "FLAGS =0x%08x\n", val); asm volatile("mrc p15, 0, %0, c9, c12, 5" : "=r" (val)); printk(KERN_INFO "SELECT=0x%08x\n", val); asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (val)); printk(KERN_INFO "CCNT =0x%08x\n", val); for (cnt = ARMV7_COUNTER0; cnt < ARMV7_COUNTER_LAST; cnt++) { armv7_pmnc_select_counter(cnt); asm volatile("mrc p15, 0, %0, c9, c13, 2" : "=r" (val)); printk(KERN_INFO "CNT[%d] count =0x%08x\n", cnt-ARMV7_EVENT_CNT_TO_CNTx, val); asm volatile("mrc p15, 0, %0, c9, c13, 1" : "=r" (val)); printk(KERN_INFO "CNT[%d] evtsel=0x%08x\n", cnt-ARMV7_EVENT_CNT_TO_CNTx, val); } } #endif void armv7pmu_enable_event(struct hw_perf_event *hwc, int idx) { unsigned long flags; /* * Enable counter and interrupt, and set the counter to count * the event that we're interested in. */ spin_lock_irqsave(&pmu_lock, flags); /* * Disable counter */ armv7_pmnc_disable_counter(idx); /* * Set event (if destined for PMNx counters) * We don't need to set the event if it's a cycle count */ if (idx != ARMV7_CYCLE_COUNTER) armv7_pmnc_write_evtsel(idx, hwc->config_base); /* * Enable interrupt for this counter */ armv7_pmnc_enable_intens(idx); /* * Enable counter */ armv7_pmnc_enable_counter(idx); spin_unlock_irqrestore(&pmu_lock, flags); } static void armv7pmu_disable_event(struct hw_perf_event *hwc, int idx) { unsigned long flags; /* * Disable counter and interrupt */ spin_lock_irqsave(&pmu_lock, flags); /* * Disable counter */ armv7_pmnc_disable_counter(idx); /* * Disable interrupt for this counter */ armv7_pmnc_disable_intens(idx); spin_unlock_irqrestore(&pmu_lock, flags); } static irqreturn_t armv7pmu_handle_irq(int irq_num, void *dev) { unsigned long pmnc; struct perf_sample_data data; struct cpu_hw_events *cpuc; struct pt_regs *regs; int idx; /* * Get and reset the IRQ flags */ pmnc = armv7_pmnc_getreset_flags(); /* * Did an overflow occur? */ if (!armv7_pmnc_has_overflowed(pmnc)) return IRQ_NONE; /* * Handle the counter(s) overflow(s) */ regs = get_irq_regs(); perf_sample_data_init(&data, 0); cpuc = &__get_cpu_var(cpu_hw_events); for (idx = 0; idx <= armpmu->num_events; ++idx) { struct perf_event *event = cpuc->events[idx]; struct hw_perf_event *hwc; if (!test_bit(idx, cpuc->active_mask)) continue; /* * We have a single interrupt for all counters. Check that * each counter has overflowed before we process it. */ if (!armv7_pmnc_counter_has_overflowed(pmnc, idx)) continue; hwc = &event->hw; armpmu_event_update(event, hwc, idx); data.period = event->hw.last_period; if (!armpmu_event_set_period(event, hwc, idx)) continue; if (perf_event_overflow(event, 0, &data, regs)) armpmu->disable(hwc, idx); } /* * Handle the pending perf events. * * Note: this call *must* be run with interrupts enabled. For * platforms that can have the PMU interrupts raised as a PMI, this * will not work. */ perf_event_do_pending(); return IRQ_HANDLED; } static void armv7pmu_start(void) { unsigned long flags; spin_lock_irqsave(&pmu_lock, flags); /* Enable all counters */ armv7_pmnc_write(armv7_pmnc_read() | ARMV7_PMNC_E); spin_unlock_irqrestore(&pmu_lock, flags); } static void armv7pmu_stop(void) { unsigned long flags; spin_lock_irqsave(&pmu_lock, flags); /* Disable all counters */ armv7_pmnc_write(armv7_pmnc_read() & ~ARMV7_PMNC_E); spin_unlock_irqrestore(&pmu_lock, flags); } static inline int armv7_a8_pmu_event_map(int config) { int mapping = armv7_a8_perf_map[config]; if (HW_OP_UNSUPPORTED == mapping) mapping = -EOPNOTSUPP; return mapping; } static inline int armv7_a9_pmu_event_map(int config) { int mapping = armv7_a9_perf_map[config]; if (HW_OP_UNSUPPORTED == mapping) mapping = -EOPNOTSUPP; return mapping; } static u64 armv7pmu_raw_event(u64 config) { return config & 0xff; } static int armv7pmu_get_event_idx(struct cpu_hw_events *cpuc, struct hw_perf_event *event) { int idx; /* Always place a cycle counter into the cycle counter. */ if (event->config_base == ARMV7_PERFCTR_CPU_CYCLES) { if (test_and_set_bit(ARMV7_CYCLE_COUNTER, cpuc->used_mask)) return -EAGAIN; return ARMV7_CYCLE_COUNTER; } else { /* * For anything other than a cycle counter, try and use * the events counters */ for (idx = ARMV7_COUNTER0; idx <= armpmu->num_events; ++idx) { if (!test_and_set_bit(idx, cpuc->used_mask)) return idx; } /* The counters are all in use. */ return -EAGAIN; } } static struct arm_pmu armv7pmu = { .handle_irq = armv7pmu_handle_irq, .enable = armv7pmu_enable_event, .disable = armv7pmu_disable_event, .raw_event = armv7pmu_raw_event, .read_counter = armv7pmu_read_counter, .write_counter = armv7pmu_write_counter, .get_event_idx = armv7pmu_get_event_idx, .start = armv7pmu_start, .stop = armv7pmu_stop, .max_period = (1LLU << 32) - 1, }; static u32 __init armv7_reset_read_pmnc(void) { u32 nb_cnt; /* Initialize & Reset PMNC: C and P bits */ armv7_pmnc_write(ARMV7_PMNC_P | ARMV7_PMNC_C); /* Read the nb of CNTx counters supported from PMNC */ nb_cnt = (armv7_pmnc_read() >> ARMV7_PMNC_N_SHIFT) & ARMV7_PMNC_N_MASK; /* Add the CPU cycles counter and return */ return nb_cnt + 1; } static int __init init_hw_perf_events(void) { unsigned long cpuid = read_cpuid_id(); unsigned long implementor = (cpuid & 0xFF000000) >> 24; unsigned long part_number = (cpuid & 0xFFF0); /* We only support ARM CPUs implemented by ARM at the moment. */ if (0x41 == implementor) { switch (part_number) { case 0xB360: /* ARM1136 */ case 0xB560: /* ARM1156 */ case 0xB760: /* ARM1176 */ armpmu = &armv6pmu; memcpy(armpmu_perf_cache_map, armv6_perf_cache_map, sizeof(armv6_perf_cache_map)); perf_max_events = armv6pmu.num_events; break; case 0xB020: /* ARM11mpcore */ armpmu = &armv6mpcore_pmu; memcpy(armpmu_perf_cache_map, armv6mpcore_perf_cache_map, sizeof(armv6mpcore_perf_cache_map)); perf_max_events = armv6mpcore_pmu.num_events; break; case 0xC080: /* Cortex-A8 */ armv7pmu.name = ARMV7_PMU_CORTEX_A8_NAME; memcpy(armpmu_perf_cache_map, armv7_a8_perf_cache_map, sizeof(armv7_a8_perf_cache_map)); armv7pmu.event_map = armv7_a8_pmu_event_map; armpmu = &armv7pmu; /* Reset PMNC and read the nb of CNTx counters supported */ armv7pmu.num_events = armv7_reset_read_pmnc(); perf_max_events = armv7pmu.num_events; break; case 0xC090: /* Cortex-A9 */ armv7pmu.name = ARMV7_PMU_CORTEX_A9_NAME; memcpy(armpmu_perf_cache_map, armv7_a9_perf_cache_map, sizeof(armv7_a9_perf_cache_map)); armv7pmu.event_map = armv7_a9_pmu_event_map; armpmu = &armv7pmu; /* Reset PMNC and read the nb of CNTx counters supported */ armv7pmu.num_events = armv7_reset_read_pmnc(); perf_max_events = armv7pmu.num_events; break; default: pr_info("no hardware support available\n"); perf_max_events = -1; } } if (armpmu) pr_info("enabled with %s PMU driver, %d counters available\n", armpmu->name, armpmu->num_events); return 0; } arch_initcall(init_hw_perf_events); /* * Callchain handling code. */ static inline void callchain_store(struct perf_callchain_entry *entry, u64 ip) { if (entry->nr < PERF_MAX_STACK_DEPTH) entry->ip[entry->nr++] = ip; } /* * The registers we're interested in are at the end of the variable * length saved register structure. The fp points at the end of this * structure so the address of this struct is: * (struct frame_tail *)(xxx->fp)-1 * * This code has been adapted from the ARM OProfile support. */ struct frame_tail { struct frame_tail *fp; unsigned long sp; unsigned long lr; } __attribute__((packed)); /* * Get the return address for a single stackframe and return a pointer to the * next frame tail. */ static struct frame_tail * user_backtrace(struct frame_tail *tail, struct perf_callchain_entry *entry) { struct frame_tail buftail; /* Also check accessibility of one struct frame_tail beyond */ if (!access_ok(VERIFY_READ, tail, sizeof(buftail))) return NULL; if (__copy_from_user_inatomic(&buftail, tail, sizeof(buftail))) return NULL; callchain_store(entry, buftail.lr); /* * Frame pointers should strictly progress back up the stack * (towards higher addresses). */ if (tail >= buftail.fp) return NULL; return buftail.fp - 1; } static void perf_callchain_user(struct pt_regs *regs, struct perf_callchain_entry *entry) { struct frame_tail *tail; callchain_store(entry, PERF_CONTEXT_USER); if (!user_mode(regs)) regs = task_pt_regs(current); tail = (struct frame_tail *)regs->ARM_fp - 1; while (tail && !((unsigned long)tail & 0x3)) tail = user_backtrace(tail, entry); } /* * Gets called by walk_stackframe() for every stackframe. This will be called * whist unwinding the stackframe and is like a subroutine return so we use * the PC. */ static int callchain_trace(struct stackframe *fr, void *data) { struct perf_callchain_entry *entry = data; callchain_store(entry, fr->pc); return 0; } static void perf_callchain_kernel(struct pt_regs *regs, struct perf_callchain_entry *entry) { struct stackframe fr; callchain_store(entry, PERF_CONTEXT_KERNEL); fr.fp = regs->ARM_fp; fr.sp = regs->ARM_sp; fr.lr = regs->ARM_lr; fr.pc = regs->ARM_pc; walk_stackframe(&fr, callchain_trace, entry); } static void perf_do_callchain(struct pt_regs *regs, struct perf_callchain_entry *entry) { int is_user; if (!regs) return; is_user = user_mode(regs); if (!current || !current->pid) return; if (is_user && current->state != TASK_RUNNING) return; if (!is_user) perf_callchain_kernel(regs, entry); if (current->mm) perf_callchain_user(regs, entry); } static DEFINE_PER_CPU(struct perf_callchain_entry, pmc_irq_entry); struct perf_callchain_entry * perf_callchain(struct pt_regs *regs) { struct perf_callchain_entry *entry = &__get_cpu_var(pmc_irq_entry); entry->nr = 0; perf_do_callchain(regs, entry); return entry; }