| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Peter Zijlstra | 4650 | 38.48% | 88 | 26.51% |
| Kan Liang | 1623 | 13.43% | 28 | 8.43% |
| Robert Richter | 1007 | 8.33% | 28 | 8.43% |
| Jiri Olsa | 608 | 5.03% | 8 | 2.41% |
| Stéphane Eranian | 576 | 4.77% | 18 | 5.42% |
| Andi Kleen | 438 | 3.62% | 14 | 4.22% |
| Alexander Shishkin | 408 | 3.38% | 7 | 2.11% |
| Thomas Gleixner | 372 | 3.08% | 8 | 2.41% |
| Andrew Lutomirski | 244 | 2.02% | 10 | 3.01% |
| Ingo Molnar | 195 | 1.61% | 16 | 4.82% |
| Kim Phillips | 180 | 1.49% | 2 | 0.60% |
| Lin Ming | 165 | 1.37% | 2 | 0.60% |
| Like Xu | 164 | 1.36% | 8 | 2.41% |
| Sukadev Bhattiprolu | 124 | 1.03% | 2 | 0.60% |
| Török Edwin | 103 | 0.85% | 1 | 0.30% |
| Don Zickus | 101 | 0.84% | 4 | 1.20% |
| Yanmin Zhang | 87 | 0.72% | 2 | 0.60% |
| Cyrill V. Gorcunov | 75 | 0.62% | 3 | 0.90% |
| Gleb Natapov | 75 | 0.62% | 1 | 0.30% |
| Josh Poimboeuf | 58 | 0.48% | 3 | 0.90% |
| Yan Zheng | 48 | 0.40% | 5 | 1.51% |
| Jaswinder Singh Rajput | 47 | 0.39% | 4 | 1.20% |
| Paolo Bonzini | 46 | 0.38% | 1 | 0.30% |
| Adrian Hunter | 45 | 0.37% | 2 | 0.60% |
| Anthony Steinhauser | 41 | 0.34% | 1 | 0.30% |
| George Dunlap | 41 | 0.34% | 1 | 0.30% |
| Vince Weaver | 41 | 0.34% | 3 | 0.90% |
| Kairui Song | 41 | 0.34% | 1 | 0.30% |
| Tejun Heo | 37 | 0.31% | 2 | 0.60% |
| Al Viro | 29 | 0.24% | 1 | 0.30% |
| Kevin Winchester | 27 | 0.22% | 1 | 0.30% |
| Dave Hansen | 26 | 0.22% | 1 | 0.30% |
| Arun Sharma | 24 | 0.20% | 1 | 0.30% |
| Frédéric Weisbecker | 24 | 0.20% | 3 | 0.90% |
| Alexey Budankov | 23 | 0.19% | 1 | 0.30% |
| Christoph Lameter | 21 | 0.17% | 1 | 0.30% |
| Reinette Chatre | 21 | 0.17% | 1 | 0.30% |
| Juergen Gross | 19 | 0.16% | 1 | 0.30% |
| Andre Przywara | 18 | 0.15% | 1 | 0.30% |
| Pu Wen | 18 | 0.15% | 1 | 0.30% |
| Shuah Khan | 18 | 0.15% | 1 | 0.30% |
| Maria Dimakopoulou | 13 | 0.11% | 2 | 0.60% |
| CodyYao-oc | 13 | 0.11% | 1 | 0.30% |
| Sean Christopherson | 13 | 0.11% | 2 | 0.60% |
| Tom Lendacky | 12 | 0.10% | 1 | 0.30% |
| Arnaldo Carvalho de Melo | 10 | 0.08% | 1 | 0.30% |
| Davidlohr Bueso A | 9 | 0.07% | 1 | 0.30% |
| Arnd Bergmann | 7 | 0.06% | 2 | 0.60% |
| Chen Yucong | 7 | 0.06% | 1 | 0.30% |
| Song Liu | 7 | 0.06% | 1 | 0.30% |
| Johannes Weiner | 7 | 0.06% | 1 | 0.30% |
| Borislav Petkov | 6 | 0.05% | 3 | 0.90% |
| Anand K Mistry | 6 | 0.05% | 1 | 0.30% |
| Rob Herring | 5 | 0.04% | 1 | 0.30% |
| Huang Rui | 5 | 0.04% | 1 | 0.30% |
| Masami Hiramatsu | 5 | 0.04% | 1 | 0.30% |
| Andrey Vagin | 5 | 0.04% | 1 | 0.30% |
| Franck Bui-Huu | 4 | 0.03% | 1 | 0.30% |
| Paul Gortmaker | 4 | 0.03% | 1 | 0.30% |
| Andrew Hunter | 4 | 0.03% | 1 | 0.30% |
| Zubin Mithra | 4 | 0.03% | 1 | 0.30% |
| Markus Metzger | 3 | 0.02% | 1 | 0.30% |
| Jacob Shin | 3 | 0.02% | 1 | 0.30% |
| Dan Carpenter | 2 | 0.02% | 1 | 0.30% |
| Gabriel Krisman Bertazi | 2 | 0.02% | 1 | 0.30% |
| Yinghai Lu | 2 | 0.02% | 1 | 0.30% |
| Akinobu Mita | 2 | 0.02% | 1 | 0.30% |
| Wei Huang | 2 | 0.02% | 1 | 0.30% |
| H. Peter Anvin | 2 | 0.02% | 1 | 0.30% |
| Gustavo A. R. Silva | 2 | 0.02% | 1 | 0.30% |
| Michel Lespinasse | 2 | 0.02% | 2 | 0.60% |
| Deepa Dinamani | 1 | 0.01% | 1 | 0.30% |
| Yong Wang | 1 | 0.01% | 1 | 0.30% |
| Colin Ian King | 1 | 0.01% | 1 | 0.30% |
| Will Deacon | 1 | 0.01% | 1 | 0.30% |
| Brian Gerst | 1 | 0.01% | 1 | 0.30% |
| Su Yanjun | 1 | 0.01% | 1 | 0.30% |
| Yang Jihong | 1 | 0.01% | 1 | 0.30% |
| Mark Rutland | 1 | 0.01% | 1 | 0.30% |
| Peter Hüwe | 1 | 0.01% | 1 | 0.30% |
| Total | 12085 | 332 |
/* * Performance events x86 architecture code * * Copyright (C) 2008 Thomas Gleixner <tglx@linutronix.de> * 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 * Copyright (C) 2009 Intel Corporation, <markus.t.metzger@intel.com> * Copyright (C) 2009 Google, Inc., Stephane Eranian * * For licencing details see kernel-base/COPYING */ #include <linux/perf_event.h> #include <linux/capability.h> #include <linux/notifier.h> #include <linux/hardirq.h> #include <linux/kprobes.h> #include <linux/export.h> #include <linux/init.h> #include <linux/kdebug.h> #include <linux/sched/mm.h> #include <linux/sched/clock.h> #include <linux/uaccess.h> #include <linux/slab.h> #include <linux/cpu.h> #include <linux/bitops.h> #include <linux/device.h> #include <linux/nospec.h> #include <linux/static_call.h> #include <asm/apic.h> #include <asm/stacktrace.h> #include <asm/nmi.h> #include <asm/smp.h> #include <asm/alternative.h> #include <asm/mmu_context.h> #include <asm/tlbflush.h> #include <asm/timer.h> #include <asm/desc.h> #include <asm/ldt.h> #include <asm/unwind.h> #include "perf_event.h" struct x86_pmu x86_pmu __read_mostly; static struct pmu pmu; DEFINE_PER_CPU(struct cpu_hw_events, cpu_hw_events) = { .enabled = 1, .pmu = &pmu, }; DEFINE_STATIC_KEY_FALSE(rdpmc_never_available_key); DEFINE_STATIC_KEY_FALSE(rdpmc_always_available_key); DEFINE_STATIC_KEY_FALSE(perf_is_hybrid); /* * This here uses DEFINE_STATIC_CALL_NULL() to get a static_call defined * from just a typename, as opposed to an actual function. */ DEFINE_STATIC_CALL_NULL(x86_pmu_handle_irq, *x86_pmu.handle_irq); DEFINE_STATIC_CALL_NULL(x86_pmu_disable_all, *x86_pmu.disable_all); DEFINE_STATIC_CALL_NULL(x86_pmu_enable_all, *x86_pmu.enable_all); DEFINE_STATIC_CALL_NULL(x86_pmu_enable, *x86_pmu.enable); DEFINE_STATIC_CALL_NULL(x86_pmu_disable, *x86_pmu.disable); DEFINE_STATIC_CALL_NULL(x86_pmu_assign, *x86_pmu.assign); DEFINE_STATIC_CALL_NULL(x86_pmu_add, *x86_pmu.add); DEFINE_STATIC_CALL_NULL(x86_pmu_del, *x86_pmu.del); DEFINE_STATIC_CALL_NULL(x86_pmu_read, *x86_pmu.read); DEFINE_STATIC_CALL_NULL(x86_pmu_schedule_events, *x86_pmu.schedule_events); DEFINE_STATIC_CALL_NULL(x86_pmu_get_event_constraints, *x86_pmu.get_event_constraints); DEFINE_STATIC_CALL_NULL(x86_pmu_put_event_constraints, *x86_pmu.put_event_constraints); DEFINE_STATIC_CALL_NULL(x86_pmu_start_scheduling, *x86_pmu.start_scheduling); DEFINE_STATIC_CALL_NULL(x86_pmu_commit_scheduling, *x86_pmu.commit_scheduling); DEFINE_STATIC_CALL_NULL(x86_pmu_stop_scheduling, *x86_pmu.stop_scheduling); DEFINE_STATIC_CALL_NULL(x86_pmu_sched_task, *x86_pmu.sched_task); DEFINE_STATIC_CALL_NULL(x86_pmu_swap_task_ctx, *x86_pmu.swap_task_ctx); DEFINE_STATIC_CALL_NULL(x86_pmu_drain_pebs, *x86_pmu.drain_pebs); DEFINE_STATIC_CALL_NULL(x86_pmu_pebs_aliases, *x86_pmu.pebs_aliases); /* * This one is magic, it will get called even when PMU init fails (because * there is no PMU), in which case it should simply return NULL. */ DEFINE_STATIC_CALL_RET0(x86_pmu_guest_get_msrs, *x86_pmu.guest_get_msrs); u64 __read_mostly hw_cache_event_ids [PERF_COUNT_HW_CACHE_MAX] [PERF_COUNT_HW_CACHE_OP_MAX] [PERF_COUNT_HW_CACHE_RESULT_MAX]; u64 __read_mostly hw_cache_extra_regs [PERF_COUNT_HW_CACHE_MAX] [PERF_COUNT_HW_CACHE_OP_MAX] [PERF_COUNT_HW_CACHE_RESULT_MAX]; /* * Propagate event elapsed time into the generic event. * Can only be executed on the CPU where the event is active. * Returns the delta events processed. */ u64 x86_perf_event_update(struct perf_event *event) { struct hw_perf_event *hwc = &event->hw; int shift = 64 - x86_pmu.cntval_bits; u64 prev_raw_count, new_raw_count; u64 delta; if (unlikely(!hwc->event_base)) return 0; if (unlikely(is_topdown_count(event)) && x86_pmu.update_topdown_event) return x86_pmu.update_topdown_event(event); /* * Careful: an NMI might modify the previous event value. * * Our tactic to handle this is to first atomically read and * exchange a new raw count - then add that new-prev delta * count to the generic event atomically: */ again: prev_raw_count = local64_read(&hwc->prev_count); rdpmcl(hwc->event_base_rdpmc, new_raw_count); if (local64_cmpxchg(&hwc->prev_count, prev_raw_count, new_raw_count) != prev_raw_count) goto again; /* * Now we have the new raw value and have updated the prev * timestamp already. We can now calculate the elapsed delta * (event-)time and add that to the generic event. * * Careful, not all hw sign-extends above the physical width * of the count. */ delta = (new_raw_count << shift) - (prev_raw_count << shift); delta >>= shift; local64_add(delta, &event->count); local64_sub(delta, &hwc->period_left); return new_raw_count; } /* * Find and validate any extra registers to set up. */ static int x86_pmu_extra_regs(u64 config, struct perf_event *event) { struct extra_reg *extra_regs = hybrid(event->pmu, extra_regs); struct hw_perf_event_extra *reg; struct extra_reg *er; reg = &event->hw.extra_reg; if (!extra_regs) return 0; for (er = extra_regs; er->msr; er++) { if (er->event != (config & er->config_mask)) continue; if (event->attr.config1 & ~er->valid_mask) return -EINVAL; /* Check if the extra msrs can be safely accessed*/ if (!er->extra_msr_access) return -ENXIO; reg->idx = er->idx; reg->config = event->attr.config1; reg->reg = er->msr; break; } return 0; } static atomic_t active_events; static atomic_t pmc_refcount; static DEFINE_MUTEX(pmc_reserve_mutex); #ifdef CONFIG_X86_LOCAL_APIC static inline int get_possible_num_counters(void) { int i, num_counters = x86_pmu.num_counters; if (!is_hybrid()) return num_counters; for (i = 0; i < x86_pmu.num_hybrid_pmus; i++) num_counters = max_t(int, num_counters, x86_pmu.hybrid_pmu[i].num_counters); return num_counters; } static bool reserve_pmc_hardware(void) { int i, num_counters = get_possible_num_counters(); for (i = 0; i < num_counters; i++) { if (!reserve_perfctr_nmi(x86_pmu_event_addr(i))) goto perfctr_fail; } for (i = 0; i < num_counters; i++) { if (!reserve_evntsel_nmi(x86_pmu_config_addr(i))) goto eventsel_fail; } return true; eventsel_fail: for (i--; i >= 0; i--) release_evntsel_nmi(x86_pmu_config_addr(i)); i = num_counters; perfctr_fail: for (i--; i >= 0; i--) release_perfctr_nmi(x86_pmu_event_addr(i)); return false; } static void release_pmc_hardware(void) { int i, num_counters = get_possible_num_counters(); for (i = 0; i < num_counters; i++) { release_perfctr_nmi(x86_pmu_event_addr(i)); release_evntsel_nmi(x86_pmu_config_addr(i)); } } #else static bool reserve_pmc_hardware(void) { return true; } static void release_pmc_hardware(void) {} #endif bool check_hw_exists(struct pmu *pmu, int num_counters, int num_counters_fixed) { u64 val, val_fail = -1, val_new= ~0; int i, reg, reg_fail = -1, ret = 0; int bios_fail = 0; int reg_safe = -1; /* * Check to see if the BIOS enabled any of the counters, if so * complain and bail. */ for (i = 0; i < num_counters; i++) { reg = x86_pmu_config_addr(i); ret = rdmsrl_safe(reg, &val); if (ret) goto msr_fail; if (val & ARCH_PERFMON_EVENTSEL_ENABLE) { bios_fail = 1; val_fail = val; reg_fail = reg; } else { reg_safe = i; } } if (num_counters_fixed) { reg = MSR_ARCH_PERFMON_FIXED_CTR_CTRL; ret = rdmsrl_safe(reg, &val); if (ret) goto msr_fail; for (i = 0; i < num_counters_fixed; i++) { if (fixed_counter_disabled(i, pmu)) continue; if (val & (0x03ULL << i*4)) { bios_fail = 1; val_fail = val; reg_fail = reg; } } } /* * If all the counters are enabled, the below test will always * fail. The tools will also become useless in this scenario. * Just fail and disable the hardware counters. */ if (reg_safe == -1) { reg = reg_safe; goto msr_fail; } /* * Read the current value, change it and read it back to see if it * matches, this is needed to detect certain hardware emulators * (qemu/kvm) that don't trap on the MSR access and always return 0s. */ reg = x86_pmu_event_addr(reg_safe); if (rdmsrl_safe(reg, &val)) goto msr_fail; val ^= 0xffffUL; ret = wrmsrl_safe(reg, val); ret |= rdmsrl_safe(reg, &val_new); if (ret || val != val_new) goto msr_fail; /* * We still allow the PMU driver to operate: */ if (bios_fail) { pr_cont("Broken BIOS detected, complain to your hardware vendor.\n"); pr_err(FW_BUG "the BIOS has corrupted hw-PMU resources (MSR %x is %Lx)\n", reg_fail, val_fail); } return true; msr_fail: if (boot_cpu_has(X86_FEATURE_HYPERVISOR)) { pr_cont("PMU not available due to virtualization, using software events only.\n"); } else { pr_cont("Broken PMU hardware detected, using software events only.\n"); pr_err("Failed to access perfctr msr (MSR %x is %Lx)\n", reg, val_new); } return false; } static void hw_perf_event_destroy(struct perf_event *event) { x86_release_hardware(); atomic_dec(&active_events); } void hw_perf_lbr_event_destroy(struct perf_event *event) { hw_perf_event_destroy(event); /* undo the lbr/bts event accounting */ x86_del_exclusive(x86_lbr_exclusive_lbr); } static inline int x86_pmu_initialized(void) { return x86_pmu.handle_irq != NULL; } static inline int set_ext_hw_attr(struct hw_perf_event *hwc, struct perf_event *event) { struct perf_event_attr *attr = &event->attr; unsigned int cache_type, cache_op, cache_result; u64 config, val; config = attr->config; cache_type = (config >> 0) & 0xff; if (cache_type >= PERF_COUNT_HW_CACHE_MAX) return -EINVAL; cache_type = array_index_nospec(cache_type, PERF_COUNT_HW_CACHE_MAX); cache_op = (config >> 8) & 0xff; if (cache_op >= PERF_COUNT_HW_CACHE_OP_MAX) return -EINVAL; cache_op = array_index_nospec(cache_op, PERF_COUNT_HW_CACHE_OP_MAX); cache_result = (config >> 16) & 0xff; if (cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX) return -EINVAL; cache_result = array_index_nospec(cache_result, PERF_COUNT_HW_CACHE_RESULT_MAX); val = hybrid_var(event->pmu, hw_cache_event_ids)[cache_type][cache_op][cache_result]; if (val == 0) return -ENOENT; if (val == -1) return -EINVAL; hwc->config |= val; attr->config1 = hybrid_var(event->pmu, hw_cache_extra_regs)[cache_type][cache_op][cache_result]; return x86_pmu_extra_regs(val, event); } int x86_reserve_hardware(void) { int err = 0; if (!atomic_inc_not_zero(&pmc_refcount)) { mutex_lock(&pmc_reserve_mutex); if (atomic_read(&pmc_refcount) == 0) { if (!reserve_pmc_hardware()) { err = -EBUSY; } else { reserve_ds_buffers(); reserve_lbr_buffers(); } } if (!err) atomic_inc(&pmc_refcount); mutex_unlock(&pmc_reserve_mutex); } return err; } void x86_release_hardware(void) { if (atomic_dec_and_mutex_lock(&pmc_refcount, &pmc_reserve_mutex)) { release_pmc_hardware(); release_ds_buffers(); release_lbr_buffers(); mutex_unlock(&pmc_reserve_mutex); } } /* * Check if we can create event of a certain type (that no conflicting events * are present). */ int x86_add_exclusive(unsigned int what) { int i; /* * When lbr_pt_coexist we allow PT to coexist with either LBR or BTS. * LBR and BTS are still mutually exclusive. */ if (x86_pmu.lbr_pt_coexist && what == x86_lbr_exclusive_pt) goto out; if (!atomic_inc_not_zero(&x86_pmu.lbr_exclusive[what])) { mutex_lock(&pmc_reserve_mutex); for (i = 0; i < ARRAY_SIZE(x86_pmu.lbr_exclusive); i++) { if (i != what && atomic_read(&x86_pmu.lbr_exclusive[i])) goto fail_unlock; } atomic_inc(&x86_pmu.lbr_exclusive[what]); mutex_unlock(&pmc_reserve_mutex); } out: atomic_inc(&active_events); return 0; fail_unlock: mutex_unlock(&pmc_reserve_mutex); return -EBUSY; } void x86_del_exclusive(unsigned int what) { atomic_dec(&active_events); /* * See the comment in x86_add_exclusive(). */ if (x86_pmu.lbr_pt_coexist && what == x86_lbr_exclusive_pt) return; atomic_dec(&x86_pmu.lbr_exclusive[what]); } int x86_setup_perfctr(struct perf_event *event) { struct perf_event_attr *attr = &event->attr; struct hw_perf_event *hwc = &event->hw; u64 config; if (!is_sampling_event(event)) { hwc->sample_period = x86_pmu.max_period; hwc->last_period = hwc->sample_period; local64_set(&hwc->period_left, hwc->sample_period); } if (attr->type == event->pmu->type) return x86_pmu_extra_regs(event->attr.config, event); if (attr->type == PERF_TYPE_HW_CACHE) return set_ext_hw_attr(hwc, event); if (attr->config >= x86_pmu.max_events) return -EINVAL; attr->config = array_index_nospec((unsigned long)attr->config, x86_pmu.max_events); /* * The generic map: */ config = x86_pmu.event_map(attr->config); if (config == 0) return -ENOENT; if (config == -1LL) return -EINVAL; hwc->config |= config; return 0; } /* * check that branch_sample_type is compatible with * settings needed for precise_ip > 1 which implies * using the LBR to capture ALL taken branches at the * priv levels of the measurement */ static inline int precise_br_compat(struct perf_event *event) { u64 m = event->attr.branch_sample_type; u64 b = 0; /* must capture all branches */ if (!(m & PERF_SAMPLE_BRANCH_ANY)) return 0; m &= PERF_SAMPLE_BRANCH_KERNEL | PERF_SAMPLE_BRANCH_USER; if (!event->attr.exclude_user) b |= PERF_SAMPLE_BRANCH_USER; if (!event->attr.exclude_kernel) b |= PERF_SAMPLE_BRANCH_KERNEL; /* * ignore PERF_SAMPLE_BRANCH_HV, not supported on x86 */ return m == b; } int x86_pmu_max_precise(void) { int precise = 0; /* Support for constant skid */ if (x86_pmu.pebs_active && !x86_pmu.pebs_broken) { precise++; /* Support for IP fixup */ if (x86_pmu.lbr_nr || x86_pmu.intel_cap.pebs_format >= 2) precise++; if (x86_pmu.pebs_prec_dist) precise++; } return precise; } int x86_pmu_hw_config(struct perf_event *event) { if (event->attr.precise_ip) { int precise = x86_pmu_max_precise(); if (event->attr.precise_ip > precise) return -EOPNOTSUPP; /* There's no sense in having PEBS for non sampling events: */ if (!is_sampling_event(event)) return -EINVAL; } /* * check that PEBS LBR correction does not conflict with * whatever the user is asking with attr->branch_sample_type */ if (event->attr.precise_ip > 1 && x86_pmu.intel_cap.pebs_format < 2) { u64 *br_type = &event->attr.branch_sample_type; if (has_branch_stack(event)) { if (!precise_br_compat(event)) return -EOPNOTSUPP; /* branch_sample_type is compatible */ } else { /* * user did not specify branch_sample_type * * For PEBS fixups, we capture all * the branches at the priv level of the * event. */ *br_type = PERF_SAMPLE_BRANCH_ANY; if (!event->attr.exclude_user) *br_type |= PERF_SAMPLE_BRANCH_USER; if (!event->attr.exclude_kernel) *br_type |= PERF_SAMPLE_BRANCH_KERNEL; } } if (event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_CALL_STACK) event->attach_state |= PERF_ATTACH_TASK_DATA; /* * Generate PMC IRQs: * (keep 'enabled' bit clear for now) */ event->hw.config = ARCH_PERFMON_EVENTSEL_INT; /* * Count user and OS events unless requested not to */ if (!event->attr.exclude_user) event->hw.config |= ARCH_PERFMON_EVENTSEL_USR; if (!event->attr.exclude_kernel) event->hw.config |= ARCH_PERFMON_EVENTSEL_OS; if (event->attr.type == event->pmu->type) event->hw.config |= event->attr.config & X86_RAW_EVENT_MASK; if (event->attr.sample_period && x86_pmu.limit_period) { if (x86_pmu.limit_period(event, event->attr.sample_period) > event->attr.sample_period) return -EINVAL; } /* sample_regs_user never support XMM registers */ if (unlikely(event->attr.sample_regs_user & PERF_REG_EXTENDED_MASK)) return -EINVAL; /* * Besides the general purpose registers, XMM registers may * be collected in PEBS on some platforms, e.g. Icelake */ if (unlikely(event->attr.sample_regs_intr & PERF_REG_EXTENDED_MASK)) { if (!(event->pmu->capabilities & PERF_PMU_CAP_EXTENDED_REGS)) return -EINVAL; if (!event->attr.precise_ip) return -EINVAL; } return x86_setup_perfctr(event); } /* * Setup the hardware configuration for a given attr_type */ static int __x86_pmu_event_init(struct perf_event *event) { int err; if (!x86_pmu_initialized()) return -ENODEV; err = x86_reserve_hardware(); if (err) return err; atomic_inc(&active_events); event->destroy = hw_perf_event_destroy; event->hw.idx = -1; event->hw.last_cpu = -1; event->hw.last_tag = ~0ULL; /* mark unused */ event->hw.extra_reg.idx = EXTRA_REG_NONE; event->hw.branch_reg.idx = EXTRA_REG_NONE; return x86_pmu.hw_config(event); } void x86_pmu_disable_all(void) { struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); int idx; for (idx = 0; idx < x86_pmu.num_counters; idx++) { struct hw_perf_event *hwc = &cpuc->events[idx]->hw; u64 val; if (!test_bit(idx, cpuc->active_mask)) continue; rdmsrl(x86_pmu_config_addr(idx), val); if (!(val & ARCH_PERFMON_EVENTSEL_ENABLE)) continue; val &= ~ARCH_PERFMON_EVENTSEL_ENABLE; wrmsrl(x86_pmu_config_addr(idx), val); if (is_counter_pair(hwc)) wrmsrl(x86_pmu_config_addr(idx + 1), 0); } } struct perf_guest_switch_msr *perf_guest_get_msrs(int *nr, void *data) { return static_call(x86_pmu_guest_get_msrs)(nr, data); } EXPORT_SYMBOL_GPL(perf_guest_get_msrs); /* * There may be PMI landing after enabled=0. The PMI hitting could be before or * after disable_all. * * If PMI hits before disable_all, the PMU will be disabled in the NMI handler. * It will not be re-enabled in the NMI handler again, because enabled=0. After * handling the NMI, disable_all will be called, which will not change the * state either. If PMI hits after disable_all, the PMU is already disabled * before entering NMI handler. The NMI handler will not change the state * either. * * So either situation is harmless. */ static void x86_pmu_disable(struct pmu *pmu) { struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); if (!x86_pmu_initialized()) return; if (!cpuc->enabled) return; cpuc->n_added = 0; cpuc->enabled = 0; barrier(); static_call(x86_pmu_disable_all)(); } void x86_pmu_enable_all(int added) { struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); int idx; for (idx = 0; idx < x86_pmu.num_counters; idx++) { struct hw_perf_event *hwc = &cpuc->events[idx]->hw; if (!test_bit(idx, cpuc->active_mask)) continue; __x86_pmu_enable_event(hwc, ARCH_PERFMON_EVENTSEL_ENABLE); } } static inline int is_x86_event(struct perf_event *event) { int i; if (!is_hybrid()) return event->pmu == &pmu; for (i = 0; i < x86_pmu.num_hybrid_pmus; i++) { if (event->pmu == &x86_pmu.hybrid_pmu[i].pmu) return true; } return false; } struct pmu *x86_get_pmu(unsigned int cpu) { struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu); /* * All CPUs of the hybrid type have been offline. * The x86_get_pmu() should not be invoked. */ if (WARN_ON_ONCE(!cpuc->pmu)) return &pmu; return cpuc->pmu; } /* * Event scheduler state: * * Assign events iterating over all events and counters, beginning * with events with least weights first. Keep the current iterator * state in struct sched_state. */ struct sched_state { int weight; int event; /* event index */ int counter; /* counter index */ int unassigned; /* number of events to be assigned left */ int nr_gp; /* number of GP counters used */ u64 used; }; /* Total max is X86_PMC_IDX_MAX, but we are O(n!) limited */ #define SCHED_STATES_MAX 2 struct perf_sched { int max_weight; int max_events; int max_gp; int saved_states; struct event_constraint **constraints; struct sched_state state; struct sched_state saved[SCHED_STATES_MAX]; }; /* * Initialize iterator that runs through all events and counters. */ static void perf_sched_init(struct perf_sched *sched, struct event_constraint **constraints, int num, int wmin, int wmax, int gpmax) { int idx; memset(sched, 0, sizeof(*sched)); sched->max_events = num; sched->max_weight = wmax; sched->max_gp = gpmax; sched->constraints = constraints; for (idx = 0; idx < num; idx++) { if (constraints[idx]->weight == wmin) break; } sched->state.event = idx; /* start with min weight */ sched->state.weight = wmin; sched->state.unassigned = num; } static void perf_sched_save_state(struct perf_sched *sched) { if (WARN_ON_ONCE(sched->saved_states >= SCHED_STATES_MAX)) return; sched->saved[sched->saved_states] = sched->state; sched->saved_states++; } static bool perf_sched_restore_state(struct perf_sched *sched) { if (!sched->saved_states) return false; sched->saved_states--; sched->state = sched->saved[sched->saved_states]; /* this assignment didn't work out */ /* XXX broken vs EVENT_PAIR */ sched->state.used &= ~BIT_ULL(sched->state.counter); /* try the next one */ sched->state.counter++; return true; } /* * Select a counter for the current event to schedule. Return true on * success. */ static bool __perf_sched_find_counter(struct perf_sched *sched) { struct event_constraint *c; int idx; if (!sched->state.unassigned) return false; if (sched->state.event >= sched->max_events) return false; c = sched->constraints[sched->state.event]; /* Prefer fixed purpose counters */ if (c->idxmsk64 & (~0ULL << INTEL_PMC_IDX_FIXED)) { idx = INTEL_PMC_IDX_FIXED; for_each_set_bit_from(idx, c->idxmsk, X86_PMC_IDX_MAX) { u64 mask = BIT_ULL(idx); if (sched->state.used & mask) continue; sched->state.used |= mask; goto done; } } /* Grab the first unused counter starting with idx */ idx = sched->state.counter; for_each_set_bit_from(idx, c->idxmsk, INTEL_PMC_IDX_FIXED) { u64 mask = BIT_ULL(idx); if (c->flags & PERF_X86_EVENT_PAIR) mask |= mask << 1; if (sched->state.used & mask) continue; if (sched->state.nr_gp++ >= sched->max_gp) return false; sched->state.used |= mask; goto done; } return false; done: sched->state.counter = idx; if (c->overlap) perf_sched_save_state(sched); return true; } static bool perf_sched_find_counter(struct perf_sched *sched) { while (!__perf_sched_find_counter(sched)) { if (!perf_sched_restore_state(sched)) return false; } return true; } /* * Go through all unassigned events and find the next one to schedule. * Take events with the least weight first. Return true on success. */ static bool perf_sched_next_event(struct perf_sched *sched) { struct event_constraint *c; if (!sched->state.unassigned || !--sched->state.unassigned) return false; do { /* next event */ sched->state.event++; if (sched->state.event >= sched->max_events) { /* next weight */ sched->state.event = 0; sched->state.weight++; if (sched->state.weight > sched->max_weight) return false; } c = sched->constraints[sched->state.event]; } while (c->weight != sched->state.weight); sched->state.counter = 0; /* start with first counter */ return true; } /* * Assign a counter for each event. */ int perf_assign_events(struct event_constraint **constraints, int n, int wmin, int wmax, int gpmax, int *assign) { struct perf_sched sched; perf_sched_init(&sched, constraints, n, wmin, wmax, gpmax); do { if (!perf_sched_find_counter(&sched)) break; /* failed */ if (assign) assign[sched.state.event] = sched.state.counter; } while (perf_sched_next_event(&sched)); return sched.state.unassigned; } EXPORT_SYMBOL_GPL(perf_assign_events); int x86_schedule_events(struct cpu_hw_events *cpuc, int n, int *assign) { int num_counters = hybrid(cpuc->pmu, num_counters); struct event_constraint *c; struct perf_event *e; int n0, i, wmin, wmax, unsched = 0; struct hw_perf_event *hwc; u64 used_mask = 0; /* * Compute the number of events already present; see x86_pmu_add(), * validate_group() and x86_pmu_commit_txn(). For the former two * cpuc->n_events hasn't been updated yet, while for the latter * cpuc->n_txn contains the number of events added in the current * transaction. */ n0 = cpuc->n_events; if (cpuc->txn_flags & PERF_PMU_TXN_ADD) n0 -= cpuc->n_txn; static_call_cond(x86_pmu_start_scheduling)(cpuc); for (i = 0, wmin = X86_PMC_IDX_MAX, wmax = 0; i < n; i++) { c = cpuc->event_constraint[i]; /* * Previously scheduled events should have a cached constraint, * while new events should not have one. */ WARN_ON_ONCE((c && i >= n0) || (!c && i < n0)); /* * Request constraints for new events; or for those events that * have a dynamic constraint -- for those the constraint can * change due to external factors (sibling state, allow_tfa). */ if (!c || (c->flags & PERF_X86_EVENT_DYNAMIC)) { c = static_call(x86_pmu_get_event_constraints)(cpuc, i, cpuc->event_list[i]); cpuc->event_constraint[i] = c; } wmin = min(wmin, c->weight); wmax = max(wmax, c->weight); } /* * fastpath, try to reuse previous register */ for (i = 0; i < n; i++) { u64 mask; hwc = &cpuc->event_list[i]->hw; c = cpuc->event_constraint[i]; /* never assigned */ if (hwc->idx == -1) break; /* constraint still honored */ if (!test_bit(hwc->idx, c->idxmsk)) break; mask = BIT_ULL(hwc->idx); if (is_counter_pair(hwc)) mask |= mask << 1; /* not already used */ if (used_mask & mask) break; used_mask |= mask; if (assign) assign[i] = hwc->idx; } /* slow path */ if (i != n) { int gpmax = num_counters; /* * Do not allow scheduling of more than half the available * generic counters. * * This helps avoid counter starvation of sibling thread by * ensuring at most half the counters cannot be in exclusive * mode. There is no designated counters for the limits. Any * N/2 counters can be used. This helps with events with * specific counter constraints. */ if (is_ht_workaround_enabled() && !cpuc->is_fake && READ_ONCE(cpuc->excl_cntrs->exclusive_present)) gpmax /= 2; /* * Reduce the amount of available counters to allow fitting * the extra Merge events needed by large increment events. */ if (x86_pmu.flags & PMU_FL_PAIR) { gpmax = num_counters - cpuc->n_pair; WARN_ON(gpmax <= 0); } unsched = perf_assign_events(cpuc->event_constraint, n, wmin, wmax, gpmax, assign); } /* * In case of success (unsched = 0), mark events as committed, * so we do not put_constraint() in case new events are added * and fail to be scheduled * * We invoke the lower level commit callback to lock the resource * * We do not need to do all of this in case we are called to * validate an event group (assign == NULL) */ if (!unsched && assign) { for (i = 0; i < n; i++) static_call_cond(x86_pmu_commit_scheduling)(cpuc, i, assign[i]); } else { for (i = n0; i < n; i++) { e = cpuc->event_list[i]; /* * release events that failed scheduling */ static_call_cond(x86_pmu_put_event_constraints)(cpuc, e); cpuc->event_constraint[i] = NULL; } } static_call_cond(x86_pmu_stop_scheduling)(cpuc); return unsched ? -EINVAL : 0; } static int add_nr_metric_event(struct cpu_hw_events *cpuc, struct perf_event *event) { if (is_metric_event(event)) { if (cpuc->n_metric == INTEL_TD_METRIC_NUM) return -EINVAL; cpuc->n_metric++; cpuc->n_txn_metric++; } return 0; } static void del_nr_metric_event(struct cpu_hw_events *cpuc, struct perf_event *event) { if (is_metric_event(event)) cpuc->n_metric--; } static int collect_event(struct cpu_hw_events *cpuc, struct perf_event *event, int max_count, int n) { union perf_capabilities intel_cap = hybrid(cpuc->pmu, intel_cap); if (intel_cap.perf_metrics && add_nr_metric_event(cpuc, event)) return -EINVAL; if (n >= max_count + cpuc->n_metric) return -EINVAL; cpuc->event_list[n] = event; if (is_counter_pair(&event->hw)) { cpuc->n_pair++; cpuc->n_txn_pair++; } return 0; } /* * dogrp: true if must collect siblings events (group) * returns total number of events and error code */ static int collect_events(struct cpu_hw_events *cpuc, struct perf_event *leader, bool dogrp) { int num_counters = hybrid(cpuc->pmu, num_counters); int num_counters_fixed = hybrid(cpuc->pmu, num_counters_fixed); struct perf_event *event; int n, max_count; max_count = num_counters + num_counters_fixed; /* current number of events already accepted */ n = cpuc->n_events; if (!cpuc->n_events) cpuc->pebs_output = 0; if (!cpuc->is_fake && leader->attr.precise_ip) { /* * For PEBS->PT, if !aux_event, the group leader (PT) went * away, the group was broken down and this singleton event * can't schedule any more. */ if (is_pebs_pt(leader) && !leader->aux_event) return -EINVAL; /* * pebs_output: 0: no PEBS so far, 1: PT, 2: DS */ if (cpuc->pebs_output && cpuc->pebs_output != is_pebs_pt(leader) + 1) return -EINVAL; cpuc->pebs_output = is_pebs_pt(leader) + 1; } if (is_x86_event(leader)) { if (collect_event(cpuc, leader, max_count, n)) return -EINVAL; n++; } if (!dogrp) return n; for_each_sibling_event(event, leader) { if (!is_x86_event(event) || event->state <= PERF_EVENT_STATE_OFF) continue; if (collect_event(cpuc, event, max_count, n)) return -EINVAL; n++; } return n; } static inline void x86_assign_hw_event(struct perf_event *event, struct cpu_hw_events *cpuc, int i) { struct hw_perf_event *hwc = &event->hw; int idx; idx = hwc->idx = cpuc->assign[i]; hwc->last_cpu = smp_processor_id(); hwc->last_tag = ++cpuc->tags[i]; static_call_cond(x86_pmu_assign)(event, idx); switch (hwc->idx) { case INTEL_PMC_IDX_FIXED_BTS: case INTEL_PMC_IDX_FIXED_VLBR: hwc->config_base = 0; hwc->event_base = 0; break; case INTEL_PMC_IDX_METRIC_BASE ... INTEL_PMC_IDX_METRIC_END: /* All the metric events are mapped onto the fixed counter 3. */ idx = INTEL_PMC_IDX_FIXED_SLOTS; fallthrough; case INTEL_PMC_IDX_FIXED ... INTEL_PMC_IDX_FIXED_BTS-1: hwc->config_base = MSR_ARCH_PERFMON_FIXED_CTR_CTRL; hwc->event_base = MSR_ARCH_PERFMON_FIXED_CTR0 + (idx - INTEL_PMC_IDX_FIXED); hwc->event_base_rdpmc = (idx - INTEL_PMC_IDX_FIXED) | INTEL_PMC_FIXED_RDPMC_BASE; break; default: hwc->config_base = x86_pmu_config_addr(hwc->idx); hwc->event_base = x86_pmu_event_addr(hwc->idx); hwc->event_base_rdpmc = x86_pmu_rdpmc_index(hwc->idx); break; } } /** * x86_perf_rdpmc_index - Return PMC counter used for event * @event: the perf_event to which the PMC counter was assigned * * The counter assigned to this performance event may change if interrupts * are enabled. This counter should thus never be used while interrupts are * enabled. Before this function is used to obtain the assigned counter the * event should be checked for validity using, for example, * perf_event_read_local(), within the same interrupt disabled section in * which this counter is planned to be used. * * Return: The index of the performance monitoring counter assigned to * @perf_event. */ int x86_perf_rdpmc_index(struct perf_event *event) { lockdep_assert_irqs_disabled(); return event->hw.event_base_rdpmc; } static inline int match_prev_assignment(struct hw_perf_event *hwc, struct cpu_hw_events *cpuc, int i) { return hwc->idx == cpuc->assign[i] && hwc->last_cpu == smp_processor_id() && hwc->last_tag == cpuc->tags[i]; } static void x86_pmu_start(struct perf_event *event, int flags); static void x86_pmu_enable(struct pmu *pmu) { struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); struct perf_event *event; struct hw_perf_event *hwc; int i, added = cpuc->n_added; if (!x86_pmu_initialized()) return; if (cpuc->enabled) return; if (cpuc->n_added) { int n_running = cpuc->n_events - cpuc->n_added; /* * apply assignment obtained either from * hw_perf_group_sched_in() or x86_pmu_enable() * * step1: save events moving to new counters */ for (i = 0; i < n_running; i++) { event = cpuc->event_list[i]; hwc = &event->hw; /* * we can avoid reprogramming counter if: * - assigned same counter as last time * - running on same CPU as last time * - no other event has used the counter since */ if (hwc->idx == -1 || match_prev_assignment(hwc, cpuc, i)) continue; /* * Ensure we don't accidentally enable a stopped * counter simply because we rescheduled. */ if (hwc->state & PERF_HES_STOPPED) hwc->state |= PERF_HES_ARCH; x86_pmu_stop(event, PERF_EF_UPDATE); } /* * step2: reprogram moved events into new counters */ for (i = 0; i < cpuc->n_events; i++) { event = cpuc->event_list[i]; hwc = &event->hw; if (!match_prev_assignment(hwc, cpuc, i)) x86_assign_hw_event(event, cpuc, i); else if (i < n_running) continue; if (hwc->state & PERF_HES_ARCH) continue; /* * if cpuc->enabled = 0, then no wrmsr as * per x86_pmu_enable_event() */ x86_pmu_start(event, PERF_EF_RELOAD); } cpuc->n_added = 0; perf_events_lapic_init(); } cpuc->enabled = 1; barrier(); static_call(x86_pmu_enable_all)(added); } static DEFINE_PER_CPU(u64 [X86_PMC_IDX_MAX], pmc_prev_left); /* * Set the next IRQ period, based on the hwc->period_left value. * To be called with the event disabled in hw: */ int x86_perf_event_set_period(struct perf_event *event) { struct hw_perf_event *hwc = &event->hw; s64 left = local64_read(&hwc->period_left); s64 period = hwc->sample_period; int ret = 0, idx = hwc->idx; if (unlikely(!hwc->event_base)) return 0; if (unlikely(is_topdown_count(event)) && x86_pmu.set_topdown_event_period) return x86_pmu.set_topdown_event_period(event); /* * If we are way outside a reasonable range then just skip forward: */ if (unlikely(left <= -period)) { left = period; local64_set(&hwc->period_left, left); hwc->last_period = period; ret = 1; } if (unlikely(left <= 0)) { left += period; local64_set(&hwc->period_left, left); hwc->last_period = period; ret = 1; } /* * Quirk: certain CPUs dont like it if just 1 hw_event is left: */ if (unlikely(left < 2)) left = 2; if (left > x86_pmu.max_period) left = x86_pmu.max_period; if (x86_pmu.limit_period) left = x86_pmu.limit_period(event, left); per_cpu(pmc_prev_left[idx], smp_processor_id()) = left; /* * The hw event starts counting from this event offset, * mark it to be able to extra future deltas: */ local64_set(&hwc->prev_count, (u64)-left); wrmsrl(hwc->event_base, (u64)(-left) & x86_pmu.cntval_mask); /* * Sign extend the Merge event counter's upper 16 bits since * we currently declare a 48-bit counter width */ if (is_counter_pair(hwc)) wrmsrl(x86_pmu_event_addr(idx + 1), 0xffff); /* * Due to erratum on certan cpu we need * a second write to be sure the register * is updated properly */ if (x86_pmu.perfctr_second_write) { wrmsrl(hwc->event_base, (u64)(-left) & x86_pmu.cntval_mask); } perf_event_update_userpage(event); return ret; } void x86_pmu_enable_event(struct perf_event *event) { if (__this_cpu_read(cpu_hw_events.enabled)) __x86_pmu_enable_event(&event->hw, ARCH_PERFMON_EVENTSEL_ENABLE); } /* * Add a single event to the PMU. * * The event is added to the group of enabled events * but only if it can be scheduled with existing events. */ static int x86_pmu_add(struct perf_event *event, int flags) { struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); struct hw_perf_event *hwc; int assign[X86_PMC_IDX_MAX]; int n, n0, ret; hwc = &event->hw; n0 = cpuc->n_events; ret = n = collect_events(cpuc, event, false); if (ret < 0) goto out; hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED; if (!(flags & PERF_EF_START)) hwc->state |= PERF_HES_ARCH; /* * If group events scheduling transaction was started, * skip the schedulability test here, it will be performed * at commit time (->commit_txn) as a whole. * * If commit fails, we'll call ->del() on all events * for which ->add() was called. */ if (cpuc->txn_flags & PERF_PMU_TXN_ADD) goto done_collect; ret = static_call(x86_pmu_schedule_events)(cpuc, n, assign); if (ret) goto out; /* * copy new assignment, now we know it is possible * will be used by hw_perf_enable() */ memcpy(cpuc->assign, assign, n*sizeof(int)); done_collect: /* * Commit the collect_events() state. See x86_pmu_del() and * x86_pmu_*_txn(). */ cpuc->n_events = n; cpuc->n_added += n - n0; cpuc->n_txn += n - n0; /* * This is before x86_pmu_enable() will call x86_pmu_start(), * so we enable LBRs before an event needs them etc.. */ static_call_cond(x86_pmu_add)(event); ret = 0; out: return ret; } static void x86_pmu_start(struct perf_event *event, int flags) { struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); int idx = event->hw.idx; if (WARN_ON_ONCE(!(event->hw.state & PERF_HES_STOPPED))) return; if (WARN_ON_ONCE(idx == -1)) return; if (flags & PERF_EF_RELOAD) { WARN_ON_ONCE(!(event->hw.state & PERF_HES_UPTODATE)); x86_perf_event_set_period(event); } event->hw.state = 0; cpuc->events[idx] = event; __set_bit(idx, cpuc->active_mask); static_call(x86_pmu_enable)(event); perf_event_update_userpage(event); } void perf_event_print_debug(void) { u64 ctrl, status, overflow, pmc_ctrl, pmc_count, prev_left, fixed; u64 pebs, debugctl; int cpu = smp_processor_id(); struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu); int num_counters = hybrid(cpuc->pmu, num_counters); int num_counters_fixed = hybrid(cpuc->pmu, num_counters_fixed); struct event_constraint *pebs_constraints = hybrid(cpuc->pmu, pebs_constraints); unsigned long flags; int idx; if (!num_counters) return; local_irq_save(flags); if (x86_pmu.version >= 2) { rdmsrl(MSR_CORE_PERF_GLOBAL_CTRL, ctrl); rdmsrl(MSR_CORE_PERF_GLOBAL_STATUS, status); rdmsrl(MSR_CORE_PERF_GLOBAL_OVF_CTRL, overflow); rdmsrl(MSR_ARCH_PERFMON_FIXED_CTR_CTRL, fixed); pr_info("\n"); pr_info("CPU#%d: ctrl: %016llx\n", cpu, ctrl); pr_info("CPU#%d: status: %016llx\n", cpu, status); pr_info("CPU#%d: overflow: %016llx\n", cpu, overflow); pr_info("CPU#%d: fixed: %016llx\n", cpu, fixed); if (pebs_constraints) { rdmsrl(MSR_IA32_PEBS_ENABLE, pebs); pr_info("CPU#%d: pebs: %016llx\n", cpu, pebs); } if (x86_pmu.lbr_nr) { rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctl); pr_info("CPU#%d: debugctl: %016llx\n", cpu, debugctl); } } pr_info("CPU#%d: active: %016llx\n", cpu, *(u64 *)cpuc->active_mask); for (idx = 0; idx < num_counters; idx++) { rdmsrl(x86_pmu_config_addr(idx), pmc_ctrl); rdmsrl(x86_pmu_event_addr(idx), pmc_count); prev_left = per_cpu(pmc_prev_left[idx], cpu); pr_info("CPU#%d: gen-PMC%d ctrl: %016llx\n", cpu, idx, pmc_ctrl); pr_info("CPU#%d: gen-PMC%d count: %016llx\n", cpu, idx, pmc_count); pr_info("CPU#%d: gen-PMC%d left: %016llx\n", cpu, idx, prev_left); } for (idx = 0; idx < num_counters_fixed; idx++) { if (fixed_counter_disabled(idx, cpuc->pmu)) continue; rdmsrl(MSR_ARCH_PERFMON_FIXED_CTR0 + idx, pmc_count); pr_info("CPU#%d: fixed-PMC%d count: %016llx\n", cpu, idx, pmc_count); } local_irq_restore(flags); } void x86_pmu_stop(struct perf_event *event, int flags) { struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); struct hw_perf_event *hwc = &event->hw; if (test_bit(hwc->idx, cpuc->active_mask)) { static_call(x86_pmu_disable)(event); __clear_bit(hwc->idx, cpuc->active_mask); cpuc->events[hwc->idx] = NULL; WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED); hwc->state |= PERF_HES_STOPPED; } if ((flags & PERF_EF_UPDATE) && !(hwc->state & PERF_HES_UPTODATE)) { /* * Drain the remaining delta count out of a event * that we are disabling: */ x86_perf_event_update(event); hwc->state |= PERF_HES_UPTODATE; } } static void x86_pmu_del(struct perf_event *event, int flags) { struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); union perf_capabilities intel_cap = hybrid(cpuc->pmu, intel_cap); int i; /* * If we're called during a txn, we only need to undo x86_pmu.add. * The events never got scheduled and ->cancel_txn will truncate * the event_list. * * XXX assumes any ->del() called during a TXN will only be on * an event added during that same TXN. */ if (cpuc->txn_flags & PERF_PMU_TXN_ADD) goto do_del; __set_bit(event->hw.idx, cpuc->dirty); /* * Not a TXN, therefore cleanup properly. */ x86_pmu_stop(event, PERF_EF_UPDATE); for (i = 0; i < cpuc->n_events; i++) { if (event == cpuc->event_list[i]) break; } if (WARN_ON_ONCE(i == cpuc->n_events)) /* called ->del() without ->add() ? */ return; /* If we have a newly added event; make sure to decrease n_added. */ if (i >= cpuc->n_events - cpuc->n_added) --cpuc->n_added; static_call_cond(x86_pmu_put_event_constraints)(cpuc, event); /* Delete the array entry. */ while (++i < cpuc->n_events) { cpuc->event_list[i-1] = cpuc->event_list[i]; cpuc->event_constraint[i-1] = cpuc->event_constraint[i]; } cpuc->event_constraint[i-1] = NULL; --cpuc->n_events; if (intel_cap.perf_metrics) del_nr_metric_event(cpuc, event); perf_event_update_userpage(event); do_del: /* * This is after x86_pmu_stop(); so we disable LBRs after any * event can need them etc.. */ static_call_cond(x86_pmu_del)(event); } int x86_pmu_handle_irq(struct pt_regs *regs) { struct perf_sample_data data; struct cpu_hw_events *cpuc; struct perf_event *event; int idx, handled = 0; u64 val; cpuc = this_cpu_ptr(&cpu_hw_events); /* * Some chipsets need to unmask the LVTPC in a particular spot * inside the nmi handler. As a result, the unmasking was pushed * into all the nmi handlers. * * This generic handler doesn't seem to have any issues where the * unmasking occurs so it was left at the top. */ apic_write(APIC_LVTPC, APIC_DM_NMI); for (idx = 0; idx < x86_pmu.num_counters; idx++) { if (!test_bit(idx, cpuc->active_mask)) continue; event = cpuc->events[idx]; val = x86_perf_event_update(event); if (val & (1ULL << (x86_pmu.cntval_bits - 1))) continue; /* * event overflow */ handled++; if (!x86_perf_event_set_period(event)) continue; perf_sample_data_init(&data, 0, event->hw.last_period); if (has_branch_stack(event)) data.br_stack = &cpuc->lbr_stack; if (perf_event_overflow(event, &data, regs)) x86_pmu_stop(event, 0); } if (handled) inc_irq_stat(apic_perf_irqs); return handled; } void perf_events_lapic_init(void) { if (!x86_pmu.apic || !x86_pmu_initialized()) return; /* * Always use NMI for PMU */ apic_write(APIC_LVTPC, APIC_DM_NMI); } static int perf_event_nmi_handler(unsigned int cmd, struct pt_regs *regs) { u64 start_clock; u64 finish_clock; int ret; /* * All PMUs/events that share this PMI handler should make sure to * increment active_events for their events. */ if (!atomic_read(&active_events)) return NMI_DONE; start_clock = sched_clock(); ret = static_call(x86_pmu_handle_irq)(regs); finish_clock = sched_clock(); perf_sample_event_took(finish_clock - start_clock); return ret; } NOKPROBE_SYMBOL(perf_event_nmi_handler); struct event_constraint emptyconstraint; struct event_constraint unconstrained; static int x86_pmu_prepare_cpu(unsigned int cpu) { struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu); int i; for (i = 0 ; i < X86_PERF_KFREE_MAX; i++) cpuc->kfree_on_online[i] = NULL; if (x86_pmu.cpu_prepare) return x86_pmu.cpu_prepare(cpu); return 0; } static int x86_pmu_dead_cpu(unsigned int cpu) { if (x86_pmu.cpu_dead) x86_pmu.cpu_dead(cpu); return 0; } static int x86_pmu_online_cpu(unsigned int cpu) { struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu); int i; for (i = 0 ; i < X86_PERF_KFREE_MAX; i++) { kfree(cpuc->kfree_on_online[i]); cpuc->kfree_on_online[i] = NULL; } return 0; } static int x86_pmu_starting_cpu(unsigned int cpu) { if (x86_pmu.cpu_starting) x86_pmu.cpu_starting(cpu); return 0; } static int x86_pmu_dying_cpu(unsigned int cpu) { if (x86_pmu.cpu_dying) x86_pmu.cpu_dying(cpu); return 0; } static void __init pmu_check_apic(void) { if (boot_cpu_has(X86_FEATURE_APIC)) return; x86_pmu.apic = 0; pr_info("no APIC, boot with the \"lapic\" boot parameter to force-enable it.\n"); pr_info("no hardware sampling interrupt available.\n"); /* * If we have a PMU initialized but no APIC * interrupts, we cannot sample hardware * events (user-space has to fall back and * sample via a hrtimer based software event): */ pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT; } static struct attribute_group x86_pmu_format_group __ro_after_init = { .name = "format", .attrs = NULL, }; ssize_t events_sysfs_show(struct device *dev, struct device_attribute *attr, char *page) { struct perf_pmu_events_attr *pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr); u64 config = 0; if (pmu_attr->id < x86_pmu.max_events) config = x86_pmu.event_map(pmu_attr->id); /* string trumps id */ if (pmu_attr->event_str) return sprintf(page, "%s\n", pmu_attr->event_str); return x86_pmu.events_sysfs_show(page, config); } EXPORT_SYMBOL_GPL(events_sysfs_show); ssize_t events_ht_sysfs_show(struct device *dev, struct device_attribute *attr, char *page) { struct perf_pmu_events_ht_attr *pmu_attr = container_of(attr, struct perf_pmu_events_ht_attr, attr); /* * Report conditional events depending on Hyper-Threading. * * This is overly conservative as usually the HT special * handling is not needed if the other CPU thread is idle. * * Note this does not (and cannot) handle the case when thread * siblings are invisible, for example with virtualization * if they are owned by some other guest. The user tool * has to re-read when a thread sibling gets onlined later. */ return sprintf(page, "%s", topology_max_smt_threads() > 1 ? pmu_attr->event_str_ht : pmu_attr->event_str_noht); } ssize_t events_hybrid_sysfs_show(struct device *dev, struct device_attribute *attr, char *page) { struct perf_pmu_events_hybrid_attr *pmu_attr = container_of(attr, struct perf_pmu_events_hybrid_attr, attr); struct x86_hybrid_pmu *pmu; const char *str, *next_str; int i; if (hweight64(pmu_attr->pmu_type) == 1) return sprintf(page, "%s", pmu_attr->event_str); /* * Hybrid PMUs may support the same event name, but with different * event encoding, e.g., the mem-loads event on an Atom PMU has * different event encoding from a Core PMU. * * The event_str includes all event encodings. Each event encoding * is divided by ";". The order of the event encodings must follow * the order of the hybrid PMU index. */ pmu = container_of(dev_get_drvdata(dev), struct x86_hybrid_pmu, pmu); str = pmu_attr->event_str; for (i = 0; i < x86_pmu.num_hybrid_pmus; i++) { if (!(x86_pmu.hybrid_pmu[i].cpu_type & pmu_attr->pmu_type)) continue; if (x86_pmu.hybrid_pmu[i].cpu_type & pmu->cpu_type) { next_str = strchr(str, ';'); if (next_str) return snprintf(page, next_str - str + 1, "%s", str); else return sprintf(page, "%s", str); } str = strchr(str, ';'); str++; } return 0; } EXPORT_SYMBOL_GPL(events_hybrid_sysfs_show); EVENT_ATTR(cpu-cycles, CPU_CYCLES ); EVENT_ATTR(instructions, INSTRUCTIONS ); EVENT_ATTR(cache-references, CACHE_REFERENCES ); EVENT_ATTR(cache-misses, CACHE_MISSES ); EVENT_ATTR(branch-instructions, BRANCH_INSTRUCTIONS ); EVENT_ATTR(branch-misses, BRANCH_MISSES ); EVENT_ATTR(bus-cycles, BUS_CYCLES ); EVENT_ATTR(stalled-cycles-frontend, STALLED_CYCLES_FRONTEND ); EVENT_ATTR(stalled-cycles-backend, STALLED_CYCLES_BACKEND ); EVENT_ATTR(ref-cycles, REF_CPU_CYCLES ); static struct attribute *empty_attrs; static struct attribute *events_attr[] = { EVENT_PTR(CPU_CYCLES), EVENT_PTR(INSTRUCTIONS), EVENT_PTR(CACHE_REFERENCES), EVENT_PTR(CACHE_MISSES), EVENT_PTR(BRANCH_INSTRUCTIONS), EVENT_PTR(BRANCH_MISSES), EVENT_PTR(BUS_CYCLES), EVENT_PTR(STALLED_CYCLES_FRONTEND), EVENT_PTR(STALLED_CYCLES_BACKEND), EVENT_PTR(REF_CPU_CYCLES), NULL, }; /* * Remove all undefined events (x86_pmu.event_map(id) == 0) * out of events_attr attributes. */ static umode_t is_visible(struct kobject *kobj, struct attribute *attr, int idx) { struct perf_pmu_events_attr *pmu_attr; if (idx >= x86_pmu.max_events) return 0; pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr.attr); /* str trumps id */ return pmu_attr->event_str || x86_pmu.event_map(idx) ? attr->mode : 0; } static struct attribute_group x86_pmu_events_group __ro_after_init = { .name = "events", .attrs = events_attr, .is_visible = is_visible, }; ssize_t x86_event_sysfs_show(char *page, u64 config, u64 event) { u64 umask = (config & ARCH_PERFMON_EVENTSEL_UMASK) >> 8; u64 cmask = (config & ARCH_PERFMON_EVENTSEL_CMASK) >> 24; bool edge = (config & ARCH_PERFMON_EVENTSEL_EDGE); bool pc = (config & ARCH_PERFMON_EVENTSEL_PIN_CONTROL); bool any = (config & ARCH_PERFMON_EVENTSEL_ANY); bool inv = (config & ARCH_PERFMON_EVENTSEL_INV); ssize_t ret; /* * We have whole page size to spend and just little data * to write, so we can safely use sprintf. */ ret = sprintf(page, "event=0x%02llx", event); if (umask) ret += sprintf(page + ret, ",umask=0x%02llx", umask); if (edge) ret += sprintf(page + ret, ",edge"); if (pc) ret += sprintf(page + ret, ",pc"); if (any) ret += sprintf(page + ret, ",any"); if (inv) ret += sprintf(page + ret, ",inv"); if (cmask) ret += sprintf(page + ret, ",cmask=0x%02llx", cmask); ret += sprintf(page + ret, "\n"); return ret; } static struct attribute_group x86_pmu_attr_group; static struct attribute_group x86_pmu_caps_group; static void x86_pmu_static_call_update(void) { static_call_update(x86_pmu_handle_irq, x86_pmu.handle_irq); static_call_update(x86_pmu_disable_all, x86_pmu.disable_all); static_call_update(x86_pmu_enable_all, x86_pmu.enable_all); static_call_update(x86_pmu_enable, x86_pmu.enable); static_call_update(x86_pmu_disable, x86_pmu.disable); static_call_update(x86_pmu_assign, x86_pmu.assign); static_call_update(x86_pmu_add, x86_pmu.add); static_call_update(x86_pmu_del, x86_pmu.del); static_call_update(x86_pmu_read, x86_pmu.read); static_call_update(x86_pmu_schedule_events, x86_pmu.schedule_events); static_call_update(x86_pmu_get_event_constraints, x86_pmu.get_event_constraints); static_call_update(x86_pmu_put_event_constraints, x86_pmu.put_event_constraints); static_call_update(x86_pmu_start_scheduling, x86_pmu.start_scheduling); static_call_update(x86_pmu_commit_scheduling, x86_pmu.commit_scheduling); static_call_update(x86_pmu_stop_scheduling, x86_pmu.stop_scheduling); static_call_update(x86_pmu_sched_task, x86_pmu.sched_task); static_call_update(x86_pmu_swap_task_ctx, x86_pmu.swap_task_ctx); static_call_update(x86_pmu_drain_pebs, x86_pmu.drain_pebs); static_call_update(x86_pmu_pebs_aliases, x86_pmu.pebs_aliases); static_call_update(x86_pmu_guest_get_msrs, x86_pmu.guest_get_msrs); } static void _x86_pmu_read(struct perf_event *event) { x86_perf_event_update(event); } void x86_pmu_show_pmu_cap(int num_counters, int num_counters_fixed, u64 intel_ctrl) { pr_info("... version: %d\n", x86_pmu.version); pr_info("... bit width: %d\n", x86_pmu.cntval_bits); pr_info("... generic registers: %d\n", num_counters); pr_info("... value mask: %016Lx\n", x86_pmu.cntval_mask); pr_info("... max period: %016Lx\n", x86_pmu.max_period); pr_info("... fixed-purpose events: %lu\n", hweight64((((1ULL << num_counters_fixed) - 1) << INTEL_PMC_IDX_FIXED) & intel_ctrl)); pr_info("... event mask: %016Lx\n", intel_ctrl); } /* * The generic code is not hybrid friendly. The hybrid_pmu->pmu * of the first registered PMU is unconditionally assigned to * each possible cpuctx->ctx.pmu. * Update the correct hybrid PMU to the cpuctx->ctx.pmu. */ void x86_pmu_update_cpu_context(struct pmu *pmu, int cpu) { struct perf_cpu_context *cpuctx; if (!pmu->pmu_cpu_context) return; cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu); cpuctx->ctx.pmu = pmu; } static int __init init_hw_perf_events(void) { struct x86_pmu_quirk *quirk; int err; pr_info("Performance Events: "); switch (boot_cpu_data.x86_vendor) { case X86_VENDOR_INTEL: err = intel_pmu_init(); break; case X86_VENDOR_AMD: err = amd_pmu_init(); break; case X86_VENDOR_HYGON: err = amd_pmu_init(); x86_pmu.name = "HYGON"; break; case X86_VENDOR_ZHAOXIN: case X86_VENDOR_CENTAUR: err = zhaoxin_pmu_init(); break; default: err = -ENOTSUPP; } if (err != 0) { pr_cont("no PMU driver, software events only.\n"); err = 0; goto out_bad_pmu; } pmu_check_apic(); /* sanity check that the hardware exists or is emulated */ if (!check_hw_exists(&pmu, x86_pmu.num_counters, x86_pmu.num_counters_fixed)) goto out_bad_pmu; pr_cont("%s PMU driver.\n", x86_pmu.name); x86_pmu.attr_rdpmc = 1; /* enable userspace RDPMC usage by default */ for (quirk = x86_pmu.quirks; quirk; quirk = quirk->next) quirk->func(); if (!x86_pmu.intel_ctrl) x86_pmu.intel_ctrl = (1 << x86_pmu.num_counters) - 1; perf_events_lapic_init(); register_nmi_handler(NMI_LOCAL, perf_event_nmi_handler, 0, "PMI"); unconstrained = (struct event_constraint) __EVENT_CONSTRAINT(0, (1ULL << x86_pmu.num_counters) - 1, 0, x86_pmu.num_counters, 0, 0); x86_pmu_format_group.attrs = x86_pmu.format_attrs; if (!x86_pmu.events_sysfs_show) x86_pmu_events_group.attrs = &empty_attrs; pmu.attr_update = x86_pmu.attr_update; if (!is_hybrid()) { x86_pmu_show_pmu_cap(x86_pmu.num_counters, x86_pmu.num_counters_fixed, x86_pmu.intel_ctrl); } if (!x86_pmu.read) x86_pmu.read = _x86_pmu_read; if (!x86_pmu.guest_get_msrs) x86_pmu.guest_get_msrs = (void *)&__static_call_return0; x86_pmu_static_call_update(); /* * Install callbacks. Core will call them for each online * cpu. */ err = cpuhp_setup_state(CPUHP_PERF_X86_PREPARE, "perf/x86:prepare", x86_pmu_prepare_cpu, x86_pmu_dead_cpu); if (err) return err; err = cpuhp_setup_state(CPUHP_AP_PERF_X86_STARTING, "perf/x86:starting", x86_pmu_starting_cpu, x86_pmu_dying_cpu); if (err) goto out; err = cpuhp_setup_state(CPUHP_AP_PERF_X86_ONLINE, "perf/x86:online", x86_pmu_online_cpu, NULL); if (err) goto out1; if (!is_hybrid()) { err = perf_pmu_register(&pmu, "cpu", PERF_TYPE_RAW); if (err) goto out2; } else { u8 cpu_type = get_this_hybrid_cpu_type(); struct x86_hybrid_pmu *hybrid_pmu; int i, j; if (!cpu_type && x86_pmu.get_hybrid_cpu_type) cpu_type = x86_pmu.get_hybrid_cpu_type(); for (i = 0; i < x86_pmu.num_hybrid_pmus; i++) { hybrid_pmu = &x86_pmu.hybrid_pmu[i]; hybrid_pmu->pmu = pmu; hybrid_pmu->pmu.type = -1; hybrid_pmu->pmu.attr_update = x86_pmu.attr_update; hybrid_pmu->pmu.capabilities |= PERF_PMU_CAP_HETEROGENEOUS_CPUS; hybrid_pmu->pmu.capabilities |= PERF_PMU_CAP_EXTENDED_HW_TYPE; err = perf_pmu_register(&hybrid_pmu->pmu, hybrid_pmu->name, (hybrid_pmu->cpu_type == hybrid_big) ? PERF_TYPE_RAW : -1); if (err) break; if (cpu_type == hybrid_pmu->cpu_type) x86_pmu_update_cpu_context(&hybrid_pmu->pmu, raw_smp_processor_id()); } if (i < x86_pmu.num_hybrid_pmus) { for (j = 0; j < i; j++) perf_pmu_unregister(&x86_pmu.hybrid_pmu[j].pmu); pr_warn("Failed to register hybrid PMUs\n"); kfree(x86_pmu.hybrid_pmu); x86_pmu.hybrid_pmu = NULL; x86_pmu.num_hybrid_pmus = 0; goto out2; } } return 0; out2: cpuhp_remove_state(CPUHP_AP_PERF_X86_ONLINE); out1: cpuhp_remove_state(CPUHP_AP_PERF_X86_STARTING); out: cpuhp_remove_state(CPUHP_PERF_X86_PREPARE); out_bad_pmu: memset(&x86_pmu, 0, sizeof(x86_pmu)); return err; } early_initcall(init_hw_perf_events); static void x86_pmu_read(struct perf_event *event) { static_call(x86_pmu_read)(event); } /* * Start group events scheduling transaction * Set the flag to make pmu::enable() not perform the * schedulability test, it will be performed at commit time * * We only support PERF_PMU_TXN_ADD transactions. Save the * transaction flags but otherwise ignore non-PERF_PMU_TXN_ADD * transactions. */ static void x86_pmu_start_txn(struct pmu *pmu, unsigned int txn_flags) { struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); WARN_ON_ONCE(cpuc->txn_flags); /* txn already in flight */ cpuc->txn_flags = txn_flags; if (txn_flags & ~PERF_PMU_TXN_ADD) return; perf_pmu_disable(pmu); __this_cpu_write(cpu_hw_events.n_txn, 0); __this_cpu_write(cpu_hw_events.n_txn_pair, 0); __this_cpu_write(cpu_hw_events.n_txn_metric, 0); } /* * Stop group events scheduling transaction * Clear the flag and pmu::enable() will perform the * schedulability test. */ static void x86_pmu_cancel_txn(struct pmu *pmu) { unsigned int txn_flags; struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); WARN_ON_ONCE(!cpuc->txn_flags); /* no txn in flight */ txn_flags = cpuc->txn_flags; cpuc->txn_flags = 0; if (txn_flags & ~PERF_PMU_TXN_ADD) return; /* * Truncate collected array by the number of events added in this * transaction. See x86_pmu_add() and x86_pmu_*_txn(). */ __this_cpu_sub(cpu_hw_events.n_added, __this_cpu_read(cpu_hw_events.n_txn)); __this_cpu_sub(cpu_hw_events.n_events, __this_cpu_read(cpu_hw_events.n_txn)); __this_cpu_sub(cpu_hw_events.n_pair, __this_cpu_read(cpu_hw_events.n_txn_pair)); __this_cpu_sub(cpu_hw_events.n_metric, __this_cpu_read(cpu_hw_events.n_txn_metric)); perf_pmu_enable(pmu); } /* * Commit group events scheduling transaction * Perform the group schedulability test as a whole * Return 0 if success * * Does not cancel the transaction on failure; expects the caller to do this. */ static int x86_pmu_commit_txn(struct pmu *pmu) { struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); int assign[X86_PMC_IDX_MAX]; int n, ret; WARN_ON_ONCE(!cpuc->txn_flags); /* no txn in flight */ if (cpuc->txn_flags & ~PERF_PMU_TXN_ADD) { cpuc->txn_flags = 0; return 0; } n = cpuc->n_events; if (!x86_pmu_initialized()) return -EAGAIN; ret = static_call(x86_pmu_schedule_events)(cpuc, n, assign); if (ret) return ret; /* * copy new assignment, now we know it is possible * will be used by hw_perf_enable() */ memcpy(cpuc->assign, assign, n*sizeof(int)); cpuc->txn_flags = 0; perf_pmu_enable(pmu); return 0; } /* * a fake_cpuc is used to validate event groups. Due to * the extra reg logic, we need to also allocate a fake * per_core and per_cpu structure. Otherwise, group events * using extra reg may conflict without the kernel being * able to catch this when the last event gets added to * the group. */ static void free_fake_cpuc(struct cpu_hw_events *cpuc) { intel_cpuc_finish(cpuc); kfree(cpuc); } static struct cpu_hw_events *allocate_fake_cpuc(struct pmu *event_pmu) { struct cpu_hw_events *cpuc; int cpu; cpuc = kzalloc(sizeof(*cpuc), GFP_KERNEL); if (!cpuc) return ERR_PTR(-ENOMEM); cpuc->is_fake = 1; if (is_hybrid()) { struct x86_hybrid_pmu *h_pmu; h_pmu = hybrid_pmu(event_pmu); if (cpumask_empty(&h_pmu->supported_cpus)) goto error; cpu = cpumask_first(&h_pmu->supported_cpus); } else cpu = raw_smp_processor_id(); cpuc->pmu = event_pmu; if (intel_cpuc_prepare(cpuc, cpu)) goto error; return cpuc; error: free_fake_cpuc(cpuc); return ERR_PTR(-ENOMEM); } /* * validate that we can schedule this event */ static int validate_event(struct perf_event *event) { struct cpu_hw_events *fake_cpuc; struct event_constraint *c; int ret = 0; fake_cpuc = allocate_fake_cpuc(event->pmu); if (IS_ERR(fake_cpuc)) return PTR_ERR(fake_cpuc); c = x86_pmu.get_event_constraints(fake_cpuc, 0, event); if (!c || !c->weight) ret = -EINVAL; if (x86_pmu.put_event_constraints) x86_pmu.put_event_constraints(fake_cpuc, event); free_fake_cpuc(fake_cpuc); return ret; } /* * validate a single event group * * validation include: * - check events are compatible which each other * - events do not compete for the same counter * - number of events <= number of counters * * validation ensures the group can be loaded onto the * PMU if it was the only group available. */ static int validate_group(struct perf_event *event) { struct perf_event *leader = event->group_leader; struct cpu_hw_events *fake_cpuc; int ret = -EINVAL, n; /* * Reject events from different hybrid PMUs. */ if (is_hybrid()) { struct perf_event *sibling; struct pmu *pmu = NULL; if (is_x86_event(leader)) pmu = leader->pmu; for_each_sibling_event(sibling, leader) { if (!is_x86_event(sibling)) continue; if (!pmu) pmu = sibling->pmu; else if (pmu != sibling->pmu) return ret; } } fake_cpuc = allocate_fake_cpuc(event->pmu); if (IS_ERR(fake_cpuc)) return PTR_ERR(fake_cpuc); /* * the event is not yet connected with its * siblings therefore we must first collect * existing siblings, then add the new event * before we can simulate the scheduling */ n = collect_events(fake_cpuc, leader, true); if (n < 0) goto out; fake_cpuc->n_events = n; n = collect_events(fake_cpuc, event, false); if (n < 0) goto out; fake_cpuc->n_events = 0; ret = x86_pmu.schedule_events(fake_cpuc, n, NULL); out: free_fake_cpuc(fake_cpuc); return ret; } static int x86_pmu_event_init(struct perf_event *event) { struct x86_hybrid_pmu *pmu = NULL; int err; if ((event->attr.type != event->pmu->type) && (event->attr.type != PERF_TYPE_HARDWARE) && (event->attr.type != PERF_TYPE_HW_CACHE)) return -ENOENT; if (is_hybrid() && (event->cpu != -1)) { pmu = hybrid_pmu(event->pmu); if (!cpumask_test_cpu(event->cpu, &pmu->supported_cpus)) return -ENOENT; } err = __x86_pmu_event_init(event); if (!err) { if (event->group_leader != event) err = validate_group(event); else err = validate_event(event); } if (err) { if (event->destroy) event->destroy(event); event->destroy = NULL; } if (READ_ONCE(x86_pmu.attr_rdpmc) && !(event->hw.flags & PERF_X86_EVENT_LARGE_PEBS)) event->hw.flags |= PERF_EVENT_FLAG_USER_READ_CNT; return err; } void perf_clear_dirty_counters(void) { struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); int i; /* Don't need to clear the assigned counter. */ for (i = 0; i < cpuc->n_events; i++) __clear_bit(cpuc->assign[i], cpuc->dirty); if (bitmap_empty(cpuc->dirty, X86_PMC_IDX_MAX)) return; for_each_set_bit(i, cpuc->dirty, X86_PMC_IDX_MAX) { if (i >= INTEL_PMC_IDX_FIXED) { /* Metrics and fake events don't have corresponding HW counters. */ if ((i - INTEL_PMC_IDX_FIXED) >= hybrid(cpuc->pmu, num_counters_fixed)) continue; wrmsrl(MSR_ARCH_PERFMON_FIXED_CTR0 + (i - INTEL_PMC_IDX_FIXED), 0); } else { wrmsrl(x86_pmu_event_addr(i), 0); } } bitmap_zero(cpuc->dirty, X86_PMC_IDX_MAX); } static void x86_pmu_event_mapped(struct perf_event *event, struct mm_struct *mm) { if (!(event->hw.flags & PERF_EVENT_FLAG_USER_READ_CNT)) return; /* * This function relies on not being called concurrently in two * tasks in the same mm. Otherwise one task could observe * perf_rdpmc_allowed > 1 and return all the way back to * userspace with CR4.PCE clear while another task is still * doing on_each_cpu_mask() to propagate CR4.PCE. * * For now, this can't happen because all callers hold mmap_lock * for write. If this changes, we'll need a different solution. */ mmap_assert_write_locked(mm); if (atomic_inc_return(&mm->context.perf_rdpmc_allowed) == 1) on_each_cpu_mask(mm_cpumask(mm), cr4_update_pce, NULL, 1); } static void x86_pmu_event_unmapped(struct perf_event *event, struct mm_struct *mm) { if (!(event->hw.flags & PERF_EVENT_FLAG_USER_READ_CNT)) return; if (atomic_dec_and_test(&mm->context.perf_rdpmc_allowed)) on_each_cpu_mask(mm_cpumask(mm), cr4_update_pce, NULL, 1); } static int x86_pmu_event_idx(struct perf_event *event) { struct hw_perf_event *hwc = &event->hw; if (!(hwc->flags & PERF_EVENT_FLAG_USER_READ_CNT)) return 0; if (is_metric_idx(hwc->idx)) return INTEL_PMC_FIXED_RDPMC_METRICS + 1; else return hwc->event_base_rdpmc + 1; } static ssize_t get_attr_rdpmc(struct device *cdev, struct device_attribute *attr, char *buf) { return snprintf(buf, 40, "%d\n", x86_pmu.attr_rdpmc); } static ssize_t set_attr_rdpmc(struct device *cdev, struct device_attribute *attr, const char *buf, size_t count) { unsigned long val; ssize_t ret; ret = kstrtoul(buf, 0, &val); if (ret) return ret; if (val > 2) return -EINVAL; if (x86_pmu.attr_rdpmc_broken) return -ENOTSUPP; if (val != x86_pmu.attr_rdpmc) { /* * Changing into or out of never available or always available, * aka perf-event-bypassing mode. This path is extremely slow, * but only root can trigger it, so it's okay. */ if (val == 0) static_branch_inc(&rdpmc_never_available_key); else if (x86_pmu.attr_rdpmc == 0) static_branch_dec(&rdpmc_never_available_key); if (val == 2) static_branch_inc(&rdpmc_always_available_key); else if (x86_pmu.attr_rdpmc == 2) static_branch_dec(&rdpmc_always_available_key); on_each_cpu(cr4_update_pce, NULL, 1); x86_pmu.attr_rdpmc = val; } return count; } static DEVICE_ATTR(rdpmc, S_IRUSR | S_IWUSR, get_attr_rdpmc, set_attr_rdpmc); static struct attribute *x86_pmu_attrs[] = { &dev_attr_rdpmc.attr, NULL, }; static struct attribute_group x86_pmu_attr_group __ro_after_init = { .attrs = x86_pmu_attrs, }; static ssize_t max_precise_show(struct device *cdev, struct device_attribute *attr, char *buf) { return snprintf(buf, PAGE_SIZE, "%d\n", x86_pmu_max_precise()); } static DEVICE_ATTR_RO(max_precise); static struct attribute *x86_pmu_caps_attrs[] = { &dev_attr_max_precise.attr, NULL }; static struct attribute_group x86_pmu_caps_group __ro_after_init = { .name = "caps", .attrs = x86_pmu_caps_attrs, }; static const struct attribute_group *x86_pmu_attr_groups[] = { &x86_pmu_attr_group, &x86_pmu_format_group, &x86_pmu_events_group, &x86_pmu_caps_group, NULL, }; static void x86_pmu_sched_task(struct perf_event_context *ctx, bool sched_in) { static_call_cond(x86_pmu_sched_task)(ctx, sched_in); } static void x86_pmu_swap_task_ctx(struct perf_event_context *prev, struct perf_event_context *next) { static_call_cond(x86_pmu_swap_task_ctx)(prev, next); } void perf_check_microcode(void) { if (x86_pmu.check_microcode) x86_pmu.check_microcode(); } static int x86_pmu_check_period(struct perf_event *event, u64 value) { if (x86_pmu.check_period && x86_pmu.check_period(event, value)) return -EINVAL; if (value && x86_pmu.limit_period) { if (x86_pmu.limit_period(event, value) > value) return -EINVAL; } return 0; } static int x86_pmu_aux_output_match(struct perf_event *event) { if (!(pmu.capabilities & PERF_PMU_CAP_AUX_OUTPUT)) return 0; if (x86_pmu.aux_output_match) return x86_pmu.aux_output_match(event); return 0; } static int x86_pmu_filter_match(struct perf_event *event) { if (x86_pmu.filter_match) return x86_pmu.filter_match(event); return 1; } static struct pmu pmu = { .pmu_enable = x86_pmu_enable, .pmu_disable = x86_pmu_disable, .attr_groups = x86_pmu_attr_groups, .event_init = x86_pmu_event_init, .event_mapped = x86_pmu_event_mapped, .event_unmapped = x86_pmu_event_unmapped, .add = x86_pmu_add, .del = x86_pmu_del, .start = x86_pmu_start, .stop = x86_pmu_stop, .read = x86_pmu_read, .start_txn = x86_pmu_start_txn, .cancel_txn = x86_pmu_cancel_txn, .commit_txn = x86_pmu_commit_txn, .event_idx = x86_pmu_event_idx, .sched_task = x86_pmu_sched_task, .swap_task_ctx = x86_pmu_swap_task_ctx, .check_period = x86_pmu_check_period, .aux_output_match = x86_pmu_aux_output_match, .filter_match = x86_pmu_filter_match, }; void arch_perf_update_userpage(struct perf_event *event, struct perf_event_mmap_page *userpg, u64 now) { struct cyc2ns_data data; u64 offset; userpg->cap_user_time = 0; userpg->cap_user_time_zero = 0; userpg->cap_user_rdpmc = !!(event->hw.flags & PERF_EVENT_FLAG_USER_READ_CNT); userpg->pmc_width = x86_pmu.cntval_bits; if (!using_native_sched_clock() || !sched_clock_stable()) return; cyc2ns_read_begin(&data); offset = data.cyc2ns_offset + __sched_clock_offset; /* * Internal timekeeping for enabled/running/stopped times * is always in the local_clock domain. */ userpg->cap_user_time = 1; userpg->time_mult = data.cyc2ns_mul; userpg->time_shift = data.cyc2ns_shift; userpg->time_offset = offset - now; /* * cap_user_time_zero doesn't make sense when we're using a different * time base for the records. */ if (!event->attr.use_clockid) { userpg->cap_user_time_zero = 1; userpg->time_zero = offset; } cyc2ns_read_end(); } /* * Determine whether the regs were taken from an irq/exception handler rather * than from perf_arch_fetch_caller_regs(). */ static bool perf_hw_regs(struct pt_regs *regs) { return regs->flags & X86_EFLAGS_FIXED; } void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { struct unwind_state state; unsigned long addr; if (perf_guest_state()) { /* TODO: We don't support guest os callchain now */ return; } if (perf_callchain_store(entry, regs->ip)) return; if (perf_hw_regs(regs)) unwind_start(&state, current, regs, NULL); else unwind_start(&state, current, NULL, (void *)regs->sp); for (; !unwind_done(&state); unwind_next_frame(&state)) { addr = unwind_get_return_address(&state); if (!addr || perf_callchain_store(entry, addr)) return; } } static inline int valid_user_frame(const void __user *fp, unsigned long size) { return __access_ok(fp, size); } static unsigned long get_segment_base(unsigned int segment) { struct desc_struct *desc; unsigned int idx = segment >> 3; if ((segment & SEGMENT_TI_MASK) == SEGMENT_LDT) { #ifdef CONFIG_MODIFY_LDT_SYSCALL struct ldt_struct *ldt; /* IRQs are off, so this synchronizes with smp_store_release */ ldt = READ_ONCE(current->active_mm->context.ldt); if (!ldt || idx >= ldt->nr_entries) return 0; desc = &ldt->entries[idx]; #else return 0; #endif } else { if (idx >= GDT_ENTRIES) return 0; desc = raw_cpu_ptr(gdt_page.gdt) + idx; } return get_desc_base(desc); } #ifdef CONFIG_IA32_EMULATION #include <linux/compat.h> static inline int perf_callchain_user32(struct pt_regs *regs, struct perf_callchain_entry_ctx *entry) { /* 32-bit process in 64-bit kernel. */ unsigned long ss_base, cs_base; struct stack_frame_ia32 frame; const struct stack_frame_ia32 __user *fp; if (user_64bit_mode(regs)) return 0; cs_base = get_segment_base(regs->cs); ss_base = get_segment_base(regs->ss); fp = compat_ptr(ss_base + regs->bp); pagefault_disable(); while (entry->nr < entry->max_stack) { if (!valid_user_frame(fp, sizeof(frame))) break; if (__get_user(frame.next_frame, &fp->next_frame)) break; if (__get_user(frame.return_address, &fp->return_address)) break; perf_callchain_store(entry, cs_base + frame.return_address); fp = compat_ptr(ss_base + frame.next_frame); } pagefault_enable(); return 1; } #else static inline int perf_callchain_user32(struct pt_regs *regs, struct perf_callchain_entry_ctx *entry) { return 0; } #endif void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) { struct stack_frame frame; const struct stack_frame __user *fp; if (perf_guest_state()) { /* TODO: We don't support guest os callchain now */ return; } /* * We don't know what to do with VM86 stacks.. ignore them for now. */ if (regs->flags & (X86_VM_MASK | PERF_EFLAGS_VM)) return; fp = (void __user *)regs->bp; perf_callchain_store(entry, regs->ip); if (!nmi_uaccess_okay()) return; if (perf_callchain_user32(regs, entry)) return; pagefault_disable(); while (entry->nr < entry->max_stack) { if (!valid_user_frame(fp, sizeof(frame))) break; if (__get_user(frame.next_frame, &fp->next_frame)) break; if (__get_user(frame.return_address, &fp->return_address)) break; perf_callchain_store(entry, frame.return_address); fp = (void __user *)frame.next_frame; } pagefault_enable(); } /* * Deal with code segment offsets for the various execution modes: * * VM86 - the good olde 16 bit days, where the linear address is * 20 bits and we use regs->ip + 0x10 * regs->cs. * * IA32 - Where we need to look at GDT/LDT segment descriptor tables * to figure out what the 32bit base address is. * * X32 - has TIF_X32 set, but is running in x86_64 * * X86_64 - CS,DS,SS,ES are all zero based. */ static unsigned long code_segment_base(struct pt_regs *regs) { /* * For IA32 we look at the GDT/LDT segment base to convert the * effective IP to a linear address. */ #ifdef CONFIG_X86_32 /* * If we are in VM86 mode, add the segment offset to convert to a * linear address. */ if (regs->flags & X86_VM_MASK) return 0x10 * regs->cs; if (user_mode(regs) && regs->cs != __USER_CS) return get_segment_base(regs->cs); #else if (user_mode(regs) && !user_64bit_mode(regs) && regs->cs != __USER32_CS) return get_segment_base(regs->cs); #endif return 0; } unsigned long perf_instruction_pointer(struct pt_regs *regs) { if (perf_guest_state()) return perf_guest_get_ip(); return regs->ip + code_segment_base(regs); } unsigned long perf_misc_flags(struct pt_regs *regs) { unsigned int guest_state = perf_guest_state(); int misc = 0; if (guest_state) { if (guest_state & PERF_GUEST_USER) misc |= PERF_RECORD_MISC_GUEST_USER; else misc |= PERF_RECORD_MISC_GUEST_KERNEL; } else { if (user_mode(regs)) misc |= PERF_RECORD_MISC_USER; else misc |= PERF_RECORD_MISC_KERNEL; } if (regs->flags & PERF_EFLAGS_EXACT) misc |= PERF_RECORD_MISC_EXACT_IP; return misc; } void perf_get_x86_pmu_capability(struct x86_pmu_capability *cap) { if (!x86_pmu_initialized()) { memset(cap, 0, sizeof(*cap)); return; } cap->version = x86_pmu.version; /* * KVM doesn't support the hybrid PMU yet. * Return the common value in global x86_pmu, * which available for all cores. */ cap->num_counters_gp = x86_pmu.num_counters; cap->num_counters_fixed = x86_pmu.num_counters_fixed; cap->bit_width_gp = x86_pmu.cntval_bits; cap->bit_width_fixed = x86_pmu.cntval_bits; cap->events_mask = (unsigned int)x86_pmu.events_maskl; cap->events_mask_len = x86_pmu.events_mask_len; cap->pebs_ept = x86_pmu.pebs_ept; } EXPORT_SYMBOL_GPL(perf_get_x86_pmu_capability); u64 perf_get_hw_event_config(int hw_event) { int max = x86_pmu.max_events; if (hw_event < max) return x86_pmu.event_map(array_index_nospec(hw_event, max)); return 0; } EXPORT_SYMBOL_GPL(perf_get_hw_event_config);
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