/* Performance event support for sparc64. * * Copyright (C) 2009 David S. Miller * * This code is based almost entirely upon the x86 perf event * code, which is: * * Copyright (C) 2008 Thomas Gleixner * Copyright (C) 2008-2009 Red Hat, Inc., Ingo Molnar * Copyright (C) 2009 Jaswinder Singh Rajput * Copyright (C) 2009 Advanced Micro Devices, Inc., Robert Richter * Copyright (C) 2008-2009 Red Hat, Inc., Peter Zijlstra */ #include #include #include #include #include #include #include #include #include /* Sparc64 chips have two performance counters, 32-bits each, with * overflow interrupts generated on transition from 0xffffffff to 0. * The counters are accessed in one go using a 64-bit register. * * Both counters are controlled using a single control register. The * only way to stop all sampling is to clear all of the context (user, * supervisor, hypervisor) sampling enable bits. But these bits apply * to both counters, thus the two counters can't be enabled/disabled * individually. * * The control register has two event fields, one for each of the two * counters. It's thus nearly impossible to have one counter going * while keeping the other one stopped. Therefore it is possible to * get overflow interrupts for counters not currently "in use" and * that condition must be checked in the overflow interrupt handler. * * So we use a hack, in that we program inactive counters with the * "sw_count0" and "sw_count1" events. These count how many times * the instruction "sethi %hi(0xfc000), %g0" is executed. It's an * unusual way to encode a NOP and therefore will not trigger in * normal code. */ #define MAX_HWEVENTS 2 #define MAX_PERIOD ((1UL << 32) - 1) #define PIC_UPPER_INDEX 0 #define PIC_LOWER_INDEX 1 struct cpu_hw_events { struct perf_event *events[MAX_HWEVENTS]; unsigned long used_mask[BITS_TO_LONGS(MAX_HWEVENTS)]; unsigned long active_mask[BITS_TO_LONGS(MAX_HWEVENTS)]; u64 pcr; int enabled; }; DEFINE_PER_CPU(struct cpu_hw_events, cpu_hw_events) = { .enabled = 1, }; struct perf_event_map { u16 encoding; u8 pic_mask; #define PIC_NONE 0x00 #define PIC_UPPER 0x01 #define PIC_LOWER 0x02 }; static unsigned long perf_event_encode(const struct perf_event_map *pmap) { return ((unsigned long) pmap->encoding << 16) | pmap->pic_mask; } static void perf_event_decode(unsigned long val, u16 *enc, u8 *msk) { *msk = val & 0xff; *enc = val >> 16; } #define C(x) PERF_COUNT_HW_CACHE_##x #define CACHE_OP_UNSUPPORTED 0xfffe #define CACHE_OP_NONSENSE 0xffff typedef struct perf_event_map cache_map_t [PERF_COUNT_HW_CACHE_MAX] [PERF_COUNT_HW_CACHE_OP_MAX] [PERF_COUNT_HW_CACHE_RESULT_MAX]; struct sparc_pmu { const struct perf_event_map *(*event_map)(int); const cache_map_t *cache_map; int max_events; int upper_shift; int lower_shift; int event_mask; int hv_bit; int irq_bit; int upper_nop; int lower_nop; }; static const struct perf_event_map ultra3_perfmon_event_map[] = { [PERF_COUNT_HW_CPU_CYCLES] = { 0x0000, PIC_UPPER | PIC_LOWER }, [PERF_COUNT_HW_INSTRUCTIONS] = { 0x0001, PIC_UPPER | PIC_LOWER }, [PERF_COUNT_HW_CACHE_REFERENCES] = { 0x0009, PIC_LOWER }, [PERF_COUNT_HW_CACHE_MISSES] = { 0x0009, PIC_UPPER }, }; static const struct perf_event_map *ultra3_event_map(int event_id) { return &ultra3_perfmon_event_map[event_id]; } static const cache_map_t ultra3_cache_map = { [C(L1D)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = { 0x09, PIC_LOWER, }, [C(RESULT_MISS)] = { 0x09, PIC_UPPER, }, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = { 0x0a, PIC_LOWER }, [C(RESULT_MISS)] = { 0x0a, PIC_UPPER }, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED }, [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED }, }, }, [C(L1I)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = { 0x09, PIC_LOWER, }, [C(RESULT_MISS)] = { 0x09, PIC_UPPER, }, }, [ C(OP_WRITE) ] = { [ C(RESULT_ACCESS) ] = { CACHE_OP_NONSENSE }, [ C(RESULT_MISS) ] = { CACHE_OP_NONSENSE }, }, [ C(OP_PREFETCH) ] = { [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED }, [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED }, }, }, [C(LL)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = { 0x0c, PIC_LOWER, }, [C(RESULT_MISS)] = { 0x0c, PIC_UPPER, }, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = { 0x0c, PIC_LOWER }, [C(RESULT_MISS)] = { 0x0c, PIC_UPPER }, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED }, [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED }, }, }, [C(DTLB)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED }, [C(RESULT_MISS)] = { 0x12, PIC_UPPER, }, }, [ 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(ITLB)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED }, [C(RESULT_MISS)] = { 0x11, PIC_UPPER, }, }, [ 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(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 const struct sparc_pmu ultra3_pmu = { .event_map = ultra3_event_map, .cache_map = &ultra3_cache_map, .max_events = ARRAY_SIZE(ultra3_perfmon_event_map), .upper_shift = 11, .lower_shift = 4, .event_mask = 0x3f, .upper_nop = 0x1c, .lower_nop = 0x14, }; /* Niagara1 is very limited. The upper PIC is hard-locked to count * only instructions, so it is free running which creates all kinds of * problems. Some hardware designs make one wonder if the creator * even looked at how this stuff gets used by software. */ static const struct perf_event_map niagara1_perfmon_event_map[] = { [PERF_COUNT_HW_CPU_CYCLES] = { 0x00, PIC_UPPER }, [PERF_COUNT_HW_INSTRUCTIONS] = { 0x00, PIC_UPPER }, [PERF_COUNT_HW_CACHE_REFERENCES] = { 0, PIC_NONE }, [PERF_COUNT_HW_CACHE_MISSES] = { 0x03, PIC_LOWER }, }; static const struct perf_event_map *niagara1_event_map(int event_id) { return &niagara1_perfmon_event_map[event_id]; } static const cache_map_t niagara1_cache_map = { [C(L1D)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED }, [C(RESULT_MISS)] = { 0x03, PIC_LOWER, }, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED }, [C(RESULT_MISS)] = { 0x03, PIC_LOWER, }, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED }, [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED }, }, }, [C(L1I)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = { 0x00, PIC_UPPER }, [C(RESULT_MISS)] = { 0x02, PIC_LOWER, }, }, [ C(OP_WRITE) ] = { [ C(RESULT_ACCESS) ] = { CACHE_OP_NONSENSE }, [ C(RESULT_MISS) ] = { CACHE_OP_NONSENSE }, }, [ 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)] = { 0x07, PIC_LOWER, }, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED }, [C(RESULT_MISS)] = { 0x07, PIC_LOWER, }, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED }, [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED }, }, }, [C(DTLB)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED }, [C(RESULT_MISS)] = { 0x05, PIC_LOWER, }, }, [ 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(ITLB)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED }, [C(RESULT_MISS)] = { 0x04, PIC_LOWER, }, }, [ 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(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 const struct sparc_pmu niagara1_pmu = { .event_map = niagara1_event_map, .cache_map = &niagara1_cache_map, .max_events = ARRAY_SIZE(niagara1_perfmon_event_map), .upper_shift = 0, .lower_shift = 4, .event_mask = 0x7, .upper_nop = 0x0, .lower_nop = 0x0, }; static const struct perf_event_map niagara2_perfmon_event_map[] = { [PERF_COUNT_HW_CPU_CYCLES] = { 0x02ff, PIC_UPPER | PIC_LOWER }, [PERF_COUNT_HW_INSTRUCTIONS] = { 0x02ff, PIC_UPPER | PIC_LOWER }, [PERF_COUNT_HW_CACHE_REFERENCES] = { 0x0208, PIC_UPPER | PIC_LOWER }, [PERF_COUNT_HW_CACHE_MISSES] = { 0x0302, PIC_UPPER | PIC_LOWER }, [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = { 0x0201, PIC_UPPER | PIC_LOWER }, [PERF_COUNT_HW_BRANCH_MISSES] = { 0x0202, PIC_UPPER | PIC_LOWER }, }; static const struct perf_event_map *niagara2_event_map(int event_id) { return &niagara2_perfmon_event_map[event_id]; } static const cache_map_t niagara2_cache_map = { [C(L1D)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = { 0x0208, PIC_UPPER | PIC_LOWER, }, [C(RESULT_MISS)] = { 0x0302, PIC_UPPER | PIC_LOWER, }, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = { 0x0210, PIC_UPPER | PIC_LOWER, }, [C(RESULT_MISS)] = { 0x0302, PIC_UPPER | PIC_LOWER, }, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED }, [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED }, }, }, [C(L1I)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = { 0x02ff, PIC_UPPER | PIC_LOWER, }, [C(RESULT_MISS)] = { 0x0301, PIC_UPPER | PIC_LOWER, }, }, [ C(OP_WRITE) ] = { [ C(RESULT_ACCESS) ] = { CACHE_OP_NONSENSE }, [ C(RESULT_MISS) ] = { CACHE_OP_NONSENSE }, }, [ C(OP_PREFETCH) ] = { [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED }, [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED }, }, }, [C(LL)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = { 0x0208, PIC_UPPER | PIC_LOWER, }, [C(RESULT_MISS)] = { 0x0330, PIC_UPPER | PIC_LOWER, }, }, [C(OP_WRITE)] = { [C(RESULT_ACCESS)] = { 0x0210, PIC_UPPER | PIC_LOWER, }, [C(RESULT_MISS)] = { 0x0320, PIC_UPPER | PIC_LOWER, }, }, [C(OP_PREFETCH)] = { [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED }, [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED }, }, }, [C(DTLB)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED }, [C(RESULT_MISS)] = { 0x0b08, PIC_UPPER | PIC_LOWER, }, }, [ 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(ITLB)] = { [C(OP_READ)] = { [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED }, [C(RESULT_MISS)] = { 0xb04, PIC_UPPER | PIC_LOWER, }, }, [ 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(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 const struct sparc_pmu niagara2_pmu = { .event_map = niagara2_event_map, .cache_map = &niagara2_cache_map, .max_events = ARRAY_SIZE(niagara2_perfmon_event_map), .upper_shift = 19, .lower_shift = 6, .event_mask = 0xfff, .hv_bit = 0x8, .irq_bit = 0x30, .upper_nop = 0x220, .lower_nop = 0x220, }; static const struct sparc_pmu *sparc_pmu __read_mostly; static u64 event_encoding(u64 event_id, int idx) { if (idx == PIC_UPPER_INDEX) event_id <<= sparc_pmu->upper_shift; else event_id <<= sparc_pmu->lower_shift; return event_id; } static u64 mask_for_index(int idx) { return event_encoding(sparc_pmu->event_mask, idx); } static u64 nop_for_index(int idx) { return event_encoding(idx == PIC_UPPER_INDEX ? sparc_pmu->upper_nop : sparc_pmu->lower_nop, idx); } static inline void sparc_pmu_enable_event(struct cpu_hw_events *cpuc, struct hw_perf_event *hwc, int idx) { u64 val, mask = mask_for_index(idx); val = cpuc->pcr; val &= ~mask; val |= hwc->config; cpuc->pcr = val; pcr_ops->write(cpuc->pcr); } static inline void sparc_pmu_disable_event(struct cpu_hw_events *cpuc, struct hw_perf_event *hwc, int idx) { u64 mask = mask_for_index(idx); u64 nop = nop_for_index(idx); u64 val; val = cpuc->pcr; val &= ~mask; val |= nop; cpuc->pcr = val; pcr_ops->write(cpuc->pcr); } void hw_perf_enable(void) { struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events); u64 val; int i; if (cpuc->enabled) return; cpuc->enabled = 1; barrier(); val = cpuc->pcr; for (i = 0; i < MAX_HWEVENTS; i++) { struct perf_event *cp = cpuc->events[i]; struct hw_perf_event *hwc; if (!cp) continue; hwc = &cp->hw; val |= hwc->config_base; } cpuc->pcr = val; pcr_ops->write(cpuc->pcr); } void hw_perf_disable(void) { struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events); u64 val; if (!cpuc->enabled) return; cpuc->enabled = 0; val = cpuc->pcr; val &= ~(PCR_UTRACE | PCR_STRACE | sparc_pmu->hv_bit | sparc_pmu->irq_bit); cpuc->pcr = val; pcr_ops->write(cpuc->pcr); } static u32 read_pmc(int idx) { u64 val; read_pic(val); if (idx == PIC_UPPER_INDEX) val >>= 32; return val & 0xffffffff; } static void write_pmc(int idx, u64 val) { u64 shift, mask, pic; shift = 0; if (idx == PIC_UPPER_INDEX) shift = 32; mask = ((u64) 0xffffffff) << shift; val <<= shift; read_pic(pic); pic &= ~mask; pic |= val; write_pic(pic); } static int sparc_perf_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 > MAX_PERIOD) left = MAX_PERIOD; atomic64_set(&hwc->prev_count, (u64)-left); write_pmc(idx, (u64)(-left) & 0xffffffff); perf_event_update_userpage(event); return ret; } static int sparc_pmu_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 = hwc->idx; if (test_and_set_bit(idx, cpuc->used_mask)) return -EAGAIN; sparc_pmu_disable_event(cpuc, hwc, idx); cpuc->events[idx] = event; set_bit(idx, cpuc->active_mask); sparc_perf_event_set_period(event, hwc, idx); sparc_pmu_enable_event(cpuc, hwc, idx); perf_event_update_userpage(event); return 0; } static u64 sparc_perf_event_update(struct perf_event *event, struct hw_perf_event *hwc, int idx) { int shift = 64 - 32; u64 prev_raw_count, new_raw_count; s64 delta; again: prev_raw_count = atomic64_read(&hwc->prev_count); new_raw_count = read_pmc(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 sparc_pmu_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; clear_bit(idx, cpuc->active_mask); sparc_pmu_disable_event(cpuc, hwc, idx); barrier(); sparc_perf_event_update(event, hwc, idx); cpuc->events[idx] = NULL; clear_bit(idx, cpuc->used_mask); perf_event_update_userpage(event); } static void sparc_pmu_read(struct perf_event *event) { struct hw_perf_event *hwc = &event->hw; sparc_perf_event_update(event, hwc, hwc->idx); } static void sparc_pmu_unthrottle(struct perf_event *event) { struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events); struct hw_perf_event *hwc = &event->hw; sparc_pmu_enable_event(cpuc, hwc, hwc->idx); } static atomic_t active_events = ATOMIC_INIT(0); static DEFINE_MUTEX(pmc_grab_mutex); static void perf_stop_nmi_watchdog(void *unused) { struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events); stop_nmi_watchdog(NULL); cpuc->pcr = pcr_ops->read(); } void perf_event_grab_pmc(void) { if (atomic_inc_not_zero(&active_events)) return; mutex_lock(&pmc_grab_mutex); if (atomic_read(&active_events) == 0) { if (atomic_read(&nmi_active) > 0) { on_each_cpu(perf_stop_nmi_watchdog, NULL, 1); BUG_ON(atomic_read(&nmi_active) != 0); } atomic_inc(&active_events); } mutex_unlock(&pmc_grab_mutex); } void perf_event_release_pmc(void) { if (atomic_dec_and_mutex_lock(&active_events, &pmc_grab_mutex)) { if (atomic_read(&nmi_active) == 0) on_each_cpu(start_nmi_watchdog, NULL, 1); mutex_unlock(&pmc_grab_mutex); } } static const struct perf_event_map *sparc_map_cache_event(u64 config) { unsigned int cache_type, cache_op, cache_result; const struct perf_event_map *pmap; if (!sparc_pmu->cache_map) return ERR_PTR(-ENOENT); cache_type = (config >> 0) & 0xff; if (cache_type >= PERF_COUNT_HW_CACHE_MAX) return ERR_PTR(-EINVAL); cache_op = (config >> 8) & 0xff; if (cache_op >= PERF_COUNT_HW_CACHE_OP_MAX) return ERR_PTR(-EINVAL); cache_result = (config >> 16) & 0xff; if (cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX) return ERR_PTR(-EINVAL); pmap = &((*sparc_pmu->cache_map)[cache_type][cache_op][cache_result]); if (pmap->encoding == CACHE_OP_UNSUPPORTED) return ERR_PTR(-ENOENT); if (pmap->encoding == CACHE_OP_NONSENSE) return ERR_PTR(-EINVAL); return pmap; } static void hw_perf_event_destroy(struct perf_event *event) { perf_event_release_pmc(); } /* Make sure all events can be scheduled into the hardware at * the same time. This is simplified by the fact that we only * need to support 2 simultaneous HW events. */ static int sparc_check_constraints(unsigned long *events, int n_ev) { if (n_ev <= perf_max_events) { u8 msk1, msk2; u16 dummy; if (n_ev == 1) return 0; BUG_ON(n_ev != 2); perf_event_decode(events[0], &dummy, &msk1); perf_event_decode(events[1], &dummy, &msk2); /* If both events can go on any counter, OK. */ if (msk1 == (PIC_UPPER | PIC_LOWER) && msk2 == (PIC_UPPER | PIC_LOWER)) return 0; /* If one event is limited to a specific counter, * and the other can go on both, OK. */ if ((msk1 == PIC_UPPER || msk1 == PIC_LOWER) && msk2 == (PIC_UPPER | PIC_LOWER)) return 0; if ((msk2 == PIC_UPPER || msk2 == PIC_LOWER) && msk1 == (PIC_UPPER | PIC_LOWER)) return 0; /* If the events are fixed to different counters, OK. */ if ((msk1 == PIC_UPPER && msk2 == PIC_LOWER) || (msk1 == PIC_LOWER && msk2 == PIC_UPPER)) return 0; /* Otherwise, there is a conflict. */ } return -1; } static int check_excludes(struct perf_event **evts, int n_prev, int n_new) { int eu = 0, ek = 0, eh = 0; struct perf_event *event; int i, n, first; n = n_prev + n_new; if (n <= 1) return 0; first = 1; for (i = 0; i < n; i++) { event = evts[i]; if (first) { eu = event->attr.exclude_user; ek = event->attr.exclude_kernel; eh = event->attr.exclude_hv; first = 0; } else if (event->attr.exclude_user != eu || event->attr.exclude_kernel != ek || event->attr.exclude_hv != eh) { return -EAGAIN; } } return 0; } static int collect_events(struct perf_event *group, int max_count, struct perf_event *evts[], unsigned long *events) { struct perf_event *event; int n = 0; if (!is_software_event(group)) { if (n >= max_count) return -1; evts[n] = group; events[n++] = group->hw.event_base; } list_for_each_entry(event, &group->sibling_list, group_entry) { if (!is_software_event(event) && event->state != PERF_EVENT_STATE_OFF) { if (n >= max_count) return -1; evts[n] = event; events[n++] = event->hw.event_base; } } return n; } static int __hw_perf_event_init(struct perf_event *event) { struct perf_event_attr *attr = &event->attr; struct perf_event *evts[MAX_HWEVENTS]; struct hw_perf_event *hwc = &event->hw; unsigned long events[MAX_HWEVENTS]; const struct perf_event_map *pmap; u64 enc; int n; if (atomic_read(&nmi_active) < 0) return -ENODEV; if (attr->type == PERF_TYPE_HARDWARE) { if (attr->config >= sparc_pmu->max_events) return -EINVAL; pmap = sparc_pmu->event_map(attr->config); } else if (attr->type == PERF_TYPE_HW_CACHE) { pmap = sparc_map_cache_event(attr->config); if (IS_ERR(pmap)) return PTR_ERR(pmap); } else return -EOPNOTSUPP; /* We save the enable bits in the config_base. So to * turn off sampling just write 'config', and to enable * things write 'config | config_base'. */ hwc->config_base = sparc_pmu->irq_bit; if (!attr->exclude_user) hwc->config_base |= PCR_UTRACE; if (!attr->exclude_kernel) hwc->config_base |= PCR_STRACE; if (!attr->exclude_hv) hwc->config_base |= sparc_pmu->hv_bit; hwc->event_base = perf_event_encode(pmap); enc = pmap->encoding; n = 0; if (event->group_leader != event) { n = collect_events(event->group_leader, perf_max_events - 1, evts, events); if (n < 0) return -EINVAL; } events[n] = hwc->event_base; evts[n] = event; if (check_excludes(evts, n, 1)) return -EINVAL; if (sparc_check_constraints(events, n + 1)) return -EINVAL; /* Try to do all error checking before this point, as unwinding * state after grabbing the PMC is difficult. */ perf_event_grab_pmc(); event->destroy = hw_perf_event_destroy; if (!hwc->sample_period) { hwc->sample_period = MAX_PERIOD; hwc->last_period = hwc->sample_period; atomic64_set(&hwc->period_left, hwc->sample_period); } if (pmap->pic_mask & PIC_UPPER) { hwc->idx = PIC_UPPER_INDEX; enc <<= sparc_pmu->upper_shift; } else { hwc->idx = PIC_LOWER_INDEX; enc <<= sparc_pmu->lower_shift; } hwc->config |= enc; return 0; } static const struct pmu pmu = { .enable = sparc_pmu_enable, .disable = sparc_pmu_disable, .read = sparc_pmu_read, .unthrottle = sparc_pmu_unthrottle, }; const struct pmu *hw_perf_event_init(struct perf_event *event) { int err = __hw_perf_event_init(event); if (err) return ERR_PTR(err); return &pmu; } void perf_event_print_debug(void) { unsigned long flags; u64 pcr, pic; int cpu; if (!sparc_pmu) return; local_irq_save(flags); cpu = smp_processor_id(); pcr = pcr_ops->read(); read_pic(pic); pr_info("\n"); pr_info("CPU#%d: PCR[%016llx] PIC[%016llx]\n", cpu, pcr, pic); local_irq_restore(flags); } static int __kprobes perf_event_nmi_handler(struct notifier_block *self, unsigned long cmd, void *__args) { struct die_args *args = __args; struct perf_sample_data data; struct cpu_hw_events *cpuc; struct pt_regs *regs; int idx; if (!atomic_read(&active_events)) return NOTIFY_DONE; switch (cmd) { case DIE_NMI: break; default: return NOTIFY_DONE; } regs = args->regs; data.addr = 0; cpuc = &__get_cpu_var(cpu_hw_events); /* If the PMU has the TOE IRQ enable bits, we need to do a * dummy write to the %pcr to clear the overflow bits and thus * the interrupt. * * Do this before we peek at the counters to determine * overflow so we don't lose any events. */ if (sparc_pmu->irq_bit) pcr_ops->write(cpuc->pcr); for (idx = 0; idx < MAX_HWEVENTS; idx++) { struct perf_event *event = cpuc->events[idx]; struct hw_perf_event *hwc; u64 val; if (!test_bit(idx, cpuc->active_mask)) continue; hwc = &event->hw; val = sparc_perf_event_update(event, hwc, idx); if (val & (1ULL << 31)) continue; data.period = event->hw.last_period; if (!sparc_perf_event_set_period(event, hwc, idx)) continue; if (perf_event_overflow(event, 1, &data, regs)) sparc_pmu_disable_event(cpuc, hwc, idx); } return NOTIFY_STOP; } static __read_mostly struct notifier_block perf_event_nmi_notifier = { .notifier_call = perf_event_nmi_handler, }; static bool __init supported_pmu(void) { if (!strcmp(sparc_pmu_type, "ultra3") || !strcmp(sparc_pmu_type, "ultra3+") || !strcmp(sparc_pmu_type, "ultra3i") || !strcmp(sparc_pmu_type, "ultra4+")) { sparc_pmu = &ultra3_pmu; return true; } if (!strcmp(sparc_pmu_type, "niagara")) { sparc_pmu = &niagara1_pmu; return true; } if (!strcmp(sparc_pmu_type, "niagara2")) { sparc_pmu = &niagara2_pmu; return true; } return false; } void __init init_hw_perf_events(void) { pr_info("Performance events: "); if (!supported_pmu()) { pr_cont("No support for PMU type '%s'\n", sparc_pmu_type); return; } pr_cont("Supported PMU type is '%s'\n", sparc_pmu_type); /* All sparc64 PMUs currently have 2 events. But this simple * driver only supports one active event at a time. */ perf_max_events = 1; register_die_notifier(&perf_event_nmi_notifier); }