From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 604B1C4332E for ; Wed, 10 Mar 2021 16:44:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 43DE464DE7 for ; Wed, 10 Mar 2021 16:44:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231571AbhCJQoR (ORCPT ); Wed, 10 Mar 2021 11:44:17 -0500 Received: from mga03.intel.com ([134.134.136.65]:37313 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232327AbhCJQnw (ORCPT ); Wed, 10 Mar 2021 11:43:52 -0500 IronPort-SDR: AvAnbfZPMrir4KP28qm41pZpoSHaFkTr2XegBRy1EIXeHhYUlpYRBcQ/4LTozzdZIUUNvXsYlX nJhbPMJDU/OQ== X-IronPort-AV: E=McAfee;i="6000,8403,9919"; a="188546443" X-IronPort-AV: E=Sophos;i="5.81,237,1610438400"; d="scan'208";a="188546443" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Mar 2021 08:43:52 -0800 IronPort-SDR: H8gz2XThYSRDdLqj5UTKqPIJWgSNsMrA2ueR/awLqwJms2syfhun1WQO2lP5CBqVTou1GpVZo6 y4G6dH9gPI1A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.81,237,1610438400"; d="scan'208";a="509729121" Received: from otc-lr-04.jf.intel.com ([10.54.39.41]) by fmsmga001.fm.intel.com with ESMTP; 10 Mar 2021 08:43:51 -0800 From: kan.liang@linux.intel.com To: peterz@infradead.org, mingo@kernel.org, linux-kernel@vger.kernel.org Cc: acme@kernel.org, tglx@linutronix.de, bp@alien8.de, namhyung@kernel.org, jolsa@redhat.com, ak@linux.intel.com, yao.jin@linux.intel.com, alexander.shishkin@linux.intel.com, adrian.hunter@intel.com, Kan Liang Subject: [PATCH V2 06/25] perf/x86: Hybrid PMU support for counters Date: Wed, 10 Mar 2021 08:37:42 -0800 Message-Id: <1615394281-68214-7-git-send-email-kan.liang@linux.intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1615394281-68214-1-git-send-email-kan.liang@linux.intel.com> References: <1615394281-68214-1-git-send-email-kan.liang@linux.intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Kan Liang The number of GP and fixed counters are different among hybrid PMUs. Each hybrid PMU should use its own counter related information. When handling a certain hybrid PMU, apply the number of counters from the corresponding hybrid PMU. When reserving the counters in the initialization of a new event, reserve all possible counters. Add a num_hybrid_pmus to indicate the number of the hybrid PMUs. The number of counter recored in the global x86_pmu is for the architecture counters which are available for all hybrid PMUs. KVM doesn't support the hybrid PMU yet. Return the number of the architecture counters for now. For the functions only available for the old platforms, e.g., intel_pmu_drain_pebs_nhm(), nothing is changed. Reviewed-by: Andi Kleen Signed-off-by: Kan Liang --- arch/x86/events/core.c | 55 ++++++++++++++++++++++++++++++-------------- arch/x86/events/intel/core.c | 8 ++++--- arch/x86/events/intel/ds.c | 14 +++++++---- arch/x86/events/perf_event.h | 4 ++++ 4 files changed, 56 insertions(+), 25 deletions(-) diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c index 90eb82e..039a851 100644 --- a/arch/x86/events/core.c +++ b/arch/x86/events/core.c @@ -180,16 +180,29 @@ 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; + int i, num_counters = get_possible_num_counters(); - for (i = 0; i < x86_pmu.num_counters; i++) { + for (i = 0; i < num_counters; i++) { if (!reserve_perfctr_nmi(x86_pmu_event_addr(i))) goto perfctr_fail; } - for (i = 0; i < x86_pmu.num_counters; i++) { + for (i = 0; i < num_counters; i++) { if (!reserve_evntsel_nmi(x86_pmu_config_addr(i))) goto eventsel_fail; } @@ -200,7 +213,7 @@ static bool reserve_pmc_hardware(void) for (i--; i >= 0; i--) release_evntsel_nmi(x86_pmu_config_addr(i)); - i = x86_pmu.num_counters; + i = num_counters; perfctr_fail: for (i--; i >= 0; i--) @@ -211,9 +224,9 @@ static bool reserve_pmc_hardware(void) static void release_pmc_hardware(void) { - int i; + int i, num_counters = get_possible_num_counters(); - for (i = 0; i < x86_pmu.num_counters; i++) { + for (i = 0; i < num_counters; i++) { release_perfctr_nmi(x86_pmu_event_addr(i)); release_evntsel_nmi(x86_pmu_config_addr(i)); } @@ -941,6 +954,7 @@ 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; @@ -1016,7 +1030,7 @@ int x86_schedule_events(struct cpu_hw_events *cpuc, int n, int *assign) /* slow path */ if (i != n) { - int gpmax = x86_pmu.num_counters; + int gpmax = num_counters; /* * Do not allow scheduling of more than half the available @@ -1037,7 +1051,7 @@ int x86_schedule_events(struct cpu_hw_events *cpuc, int n, int *assign) * the extra Merge events needed by large increment events. */ if (x86_pmu.flags & PMU_FL_PAIR) { - gpmax = x86_pmu.num_counters - cpuc->n_pair; + gpmax = num_counters - cpuc->n_pair; WARN_ON(gpmax <= 0); } @@ -1124,10 +1138,12 @@ static int collect_event(struct cpu_hw_events *cpuc, struct perf_event *event, */ 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 = x86_pmu.num_counters + x86_pmu.num_counters_fixed; + max_count = num_counters + num_counters_fixed; /* current number of events already accepted */ n = cpuc->n_events; @@ -1495,18 +1511,18 @@ void perf_event_print_debug(void) { u64 ctrl, status, overflow, pmc_ctrl, pmc_count, prev_left, fixed; u64 pebs, debugctl; - struct cpu_hw_events *cpuc; + 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); unsigned long flags; - int cpu, idx; + int idx; - if (!x86_pmu.num_counters) + if (!num_counters) return; local_irq_save(flags); - cpu = smp_processor_id(); - cpuc = &per_cpu(cpu_hw_events, cpu); - if (x86_pmu.version >= 2) { rdmsrl(MSR_CORE_PERF_GLOBAL_CTRL, ctrl); rdmsrl(MSR_CORE_PERF_GLOBAL_STATUS, status); @@ -1529,7 +1545,7 @@ void perf_event_print_debug(void) } pr_info("CPU#%d: active: %016llx\n", cpu, *(u64 *)cpuc->active_mask); - for (idx = 0; idx < x86_pmu.num_counters; idx++) { + for (idx = 0; idx < num_counters; idx++) { rdmsrl(x86_pmu_config_addr(idx), pmc_ctrl); rdmsrl(x86_pmu_event_addr(idx), pmc_count); @@ -1542,7 +1558,7 @@ void perf_event_print_debug(void) pr_info("CPU#%d: gen-PMC%d left: %016llx\n", cpu, idx, prev_left); } - for (idx = 0; idx < x86_pmu.num_counters_fixed; idx++) { + 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); @@ -2784,6 +2800,11 @@ unsigned long perf_misc_flags(struct pt_regs *regs) void perf_get_x86_pmu_capability(struct x86_pmu_capability *cap) { 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; diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c index 1f1c003..e187cf5 100644 --- a/arch/x86/events/intel/core.c +++ b/arch/x86/events/intel/core.c @@ -2711,21 +2711,23 @@ static void intel_pmu_reset(void) { struct debug_store *ds = __this_cpu_read(cpu_hw_events.ds); struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); + int num_counters_fixed = hybrid(cpuc->pmu, num_counters_fixed); + int num_counters = hybrid(cpuc->pmu, num_counters); unsigned long flags; int idx; - if (!x86_pmu.num_counters) + if (!num_counters) return; local_irq_save(flags); pr_info("clearing PMU state on CPU#%d\n", smp_processor_id()); - for (idx = 0; idx < x86_pmu.num_counters; idx++) { + for (idx = 0; idx < num_counters; idx++) { wrmsrl_safe(x86_pmu_config_addr(idx), 0ull); wrmsrl_safe(x86_pmu_event_addr(idx), 0ull); } - for (idx = 0; idx < x86_pmu.num_counters_fixed; idx++) { + for (idx = 0; idx < num_counters_fixed; idx++) { if (fixed_counter_disabled(idx, cpuc->pmu)) continue; wrmsrl_safe(MSR_ARCH_PERFMON_FIXED_CTR0 + idx, 0ull); diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c index 9328aa1..312bf3b 100644 --- a/arch/x86/events/intel/ds.c +++ b/arch/x86/events/intel/ds.c @@ -1007,6 +1007,8 @@ void intel_pmu_pebs_sched_task(struct perf_event_context *ctx, bool sched_in) static inline void pebs_update_threshold(struct cpu_hw_events *cpuc) { struct debug_store *ds = cpuc->ds; + int max_pebs_events = hybrid(cpuc->pmu, max_pebs_events); + int num_counters_fixed = hybrid(cpuc->pmu, num_counters_fixed); u64 threshold; int reserved; @@ -1014,9 +1016,9 @@ static inline void pebs_update_threshold(struct cpu_hw_events *cpuc) return; if (x86_pmu.flags & PMU_FL_PEBS_ALL) - reserved = x86_pmu.max_pebs_events + x86_pmu.num_counters_fixed; + reserved = max_pebs_events + num_counters_fixed; else - reserved = x86_pmu.max_pebs_events; + reserved = max_pebs_events; if (cpuc->n_pebs == cpuc->n_large_pebs) { threshold = ds->pebs_absolute_maximum - @@ -2072,6 +2074,8 @@ static void intel_pmu_drain_pebs_icl(struct pt_regs *iregs, struct perf_sample_d { short counts[INTEL_PMC_IDX_FIXED + MAX_FIXED_PEBS_EVENTS] = {}; struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); + int max_pebs_events = hybrid(cpuc->pmu, max_pebs_events); + int num_counters_fixed = hybrid(cpuc->pmu, num_counters_fixed); struct debug_store *ds = cpuc->ds; struct perf_event *event; void *base, *at, *top; @@ -2086,9 +2090,9 @@ static void intel_pmu_drain_pebs_icl(struct pt_regs *iregs, struct perf_sample_d ds->pebs_index = ds->pebs_buffer_base; - mask = ((1ULL << x86_pmu.max_pebs_events) - 1) | - (((1ULL << x86_pmu.num_counters_fixed) - 1) << INTEL_PMC_IDX_FIXED); - size = INTEL_PMC_IDX_FIXED + x86_pmu.num_counters_fixed; + mask = ((1ULL << max_pebs_events) - 1) | + (((1ULL << num_counters_fixed) - 1) << INTEL_PMC_IDX_FIXED); + size = INTEL_PMC_IDX_FIXED + num_counters_fixed; if (unlikely(base >= top)) { intel_pmu_pebs_event_update_no_drain(cpuc, size); diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h index b499abd6..d2f97bd 100644 --- a/arch/x86/events/perf_event.h +++ b/arch/x86/events/perf_event.h @@ -636,6 +636,9 @@ struct x86_hybrid_pmu { struct pmu pmu; union perf_capabilities intel_cap; u64 intel_ctrl; + int max_pebs_events; + int num_counters; + int num_counters_fixed; }; static __always_inline bool is_hybrid(void) @@ -853,6 +856,7 @@ struct x86_pmu { * are available for all PMUs. The hybrid_pmu only includes the * unique capabilities. */ + int num_hybrid_pmus; struct x86_hybrid_pmu *hybrid_pmu; }; -- 2.7.4