Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753928AbbDBSp1 (ORCPT ); Thu, 2 Apr 2015 14:45:27 -0400 Received: from terminus.zytor.com ([198.137.202.10]:37289 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752384AbbDBSpW (ORCPT ); Thu, 2 Apr 2015 14:45:22 -0400 Date: Thu, 2 Apr 2015 11:44:48 -0700 From: tip-bot for Stephane Eranian Message-ID: Cc: tglx@linutronix.de, peterz@infradead.org, hpa@zytor.com, mingo@kernel.org, linux-kernel@vger.kernel.org, eranian@google.com Reply-To: mingo@kernel.org, eranian@google.com, linux-kernel@vger.kernel.org, hpa@zytor.com, peterz@infradead.org, tglx@linutronix.de In-Reply-To: <1416251225-17721-13-git-send-email-eranian@google.com> References: <1416251225-17721-13-git-send-email-eranian@google.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:perf/core] perf/x86/intel: Make the HT bug workaround conditional on HT enabled Git-Commit-ID: b37609c30e41264c4df4acff78abfc894499a49b X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7325 Lines: 233 Commit-ID: b37609c30e41264c4df4acff78abfc894499a49b Gitweb: http://git.kernel.org/tip/b37609c30e41264c4df4acff78abfc894499a49b Author: Stephane Eranian AuthorDate: Mon, 17 Nov 2014 20:07:04 +0100 Committer: Ingo Molnar CommitDate: Thu, 2 Apr 2015 17:33:15 +0200 perf/x86/intel: Make the HT bug workaround conditional on HT enabled This patch disables the PMU HT bug when Hyperthreading (HT) is disabled. We cannot do this test immediately when perf_events is initialized. We need to wait until the topology information is setup properly. As such, we register a later initcall, check the topology and potentially disable the workaround. To do this, we need to ensure there is no user of the PMU. At this point of the boot, the only user is the NMI watchdog, thus we disable it during the switch and re-enable it right after. Having the workaround disabled when it is not needed provides some benefits by limiting the overhead is time and space. The workaround still ensures correct scheduling of the corrupting memory events (0xd0, 0xd1, 0xd2) when HT is off. Those events can only be measured on counters 0-3. Something else the current kernel did not handle correctly. Signed-off-by: Stephane Eranian Signed-off-by: Peter Zijlstra (Intel) Cc: bp@alien8.de Cc: jolsa@redhat.com Cc: kan.liang@intel.com Cc: maria.n.dimakopoulou@gmail.com Link: http://lkml.kernel.org/r/1416251225-17721-13-git-send-email-eranian@google.com Signed-off-by: Ingo Molnar --- arch/x86/kernel/cpu/perf_event.h | 5 ++ arch/x86/kernel/cpu/perf_event_intel.c | 95 ++++++++++++++++++++++++++-------- 2 files changed, 79 insertions(+), 21 deletions(-) diff --git a/arch/x86/kernel/cpu/perf_event.h b/arch/x86/kernel/cpu/perf_event.h index 176749c..7250c02 100644 --- a/arch/x86/kernel/cpu/perf_event.h +++ b/arch/x86/kernel/cpu/perf_event.h @@ -624,6 +624,7 @@ do { \ #define PMU_FL_NO_HT_SHARING 0x1 /* no hyper-threading resource sharing */ #define PMU_FL_HAS_RSP_1 0x2 /* has 2 equivalent offcore_rsp regs */ #define PMU_FL_EXCL_CNTRS 0x4 /* has exclusive counter requirements */ +#define PMU_FL_EXCL_ENABLED 0x8 /* exclusive counter active */ #define EVENT_VAR(_id) event_attr_##_id #define EVENT_PTR(_id) &event_attr_##_id.attr.attr @@ -904,6 +905,10 @@ int knc_pmu_init(void); ssize_t events_sysfs_show(struct device *dev, struct device_attribute *attr, char *page); +static inline int is_ht_workaround_enabled(void) +{ + return !!(x86_pmu.flags & PMU_FL_EXCL_ENABLED); +} #else /* CONFIG_CPU_SUP_INTEL */ static inline void reserve_ds_buffers(void) diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c index 4187d3f..6ea61a5 100644 --- a/arch/x86/kernel/cpu/perf_event_intel.c +++ b/arch/x86/kernel/cpu/perf_event_intel.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #include @@ -1885,8 +1886,9 @@ intel_start_scheduling(struct cpu_hw_events *cpuc) /* * nothing needed if in group validation mode */ - if (cpuc->is_fake) + if (cpuc->is_fake || !is_ht_workaround_enabled()) return; + /* * no exclusion needed */ @@ -1923,7 +1925,7 @@ intel_stop_scheduling(struct cpu_hw_events *cpuc) /* * nothing needed if in group validation mode */ - if (cpuc->is_fake) + if (cpuc->is_fake || !is_ht_workaround_enabled()) return; /* * no exclusion needed @@ -1961,7 +1963,13 @@ intel_get_excl_constraints(struct cpu_hw_events *cpuc, struct perf_event *event, * validating a group does not require * enforcing cross-thread exclusion */ - if (cpuc->is_fake) + if (cpuc->is_fake || !is_ht_workaround_enabled()) + return c; + + /* + * no exclusion needed + */ + if (!excl_cntrs) return c; /* * event requires exclusive counter access @@ -2658,18 +2666,11 @@ static void intel_pmu_cpu_starting(int cpu) } } -static void intel_pmu_cpu_dying(int cpu) +static void free_excl_cntrs(int cpu) { struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu); - struct intel_shared_regs *pc; struct intel_excl_cntrs *c; - pc = cpuc->shared_regs; - if (pc) { - if (pc->core_id == -1 || --pc->refcnt == 0) - kfree(pc); - cpuc->shared_regs = NULL; - } c = cpuc->excl_cntrs; if (c) { if (c->core_id == -1 || --c->refcnt == 0) @@ -2678,14 +2679,22 @@ static void intel_pmu_cpu_dying(int cpu) kfree(cpuc->constraint_list); cpuc->constraint_list = NULL; } +} - c = cpuc->excl_cntrs; - if (c) { - if (c->core_id == -1 || --c->refcnt == 0) - kfree(c); - cpuc->excl_cntrs = NULL; +static void intel_pmu_cpu_dying(int cpu) +{ + struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu); + struct intel_shared_regs *pc; + + pc = cpuc->shared_regs; + if (pc) { + if (pc->core_id == -1 || --pc->refcnt == 0) + kfree(pc); + cpuc->shared_regs = NULL; } + free_excl_cntrs(cpu); + fini_debug_store_on_cpu(cpu); } @@ -2904,18 +2913,18 @@ static __init void intel_nehalem_quirk(void) * HSW: HSD29 * * Only needed when HT is enabled. However detecting - * this is too difficult and model specific so we enable - * it even with HT off for now. + * if HT is enabled is difficult (model specific). So instead, + * we enable the workaround in the early boot, and verify if + * it is needed in a later initcall phase once we have valid + * topology information to check if HT is actually enabled */ static __init void intel_ht_bug(void) { - x86_pmu.flags |= PMU_FL_EXCL_CNTRS; + x86_pmu.flags |= PMU_FL_EXCL_CNTRS | PMU_FL_EXCL_ENABLED; x86_pmu.commit_scheduling = intel_commit_scheduling; x86_pmu.start_scheduling = intel_start_scheduling; x86_pmu.stop_scheduling = intel_stop_scheduling; - - pr_info("CPU erratum BJ122, BV98, HSD29 worked around\n"); } EVENT_ATTR_STR(mem-loads, mem_ld_hsw, "event=0xcd,umask=0x1,ldlat=3"); @@ -3343,3 +3352,47 @@ __init int intel_pmu_init(void) return 0; } + +/* + * HT bug: phase 2 init + * Called once we have valid topology information to check + * whether or not HT is enabled + * If HT is off, then we disable the workaround + */ +static __init int fixup_ht_bug(void) +{ + int cpu = smp_processor_id(); + int w, c; + /* + * problem not present on this CPU model, nothing to do + */ + if (!(x86_pmu.flags & PMU_FL_EXCL_ENABLED)) + return 0; + + w = cpumask_weight(topology_thread_cpumask(cpu)); + if (w > 1) { + pr_info("PMU erratum BJ122, BV98, HSD29 worked around, HT is on\n"); + return 0; + } + + watchdog_nmi_disable_all(); + + x86_pmu.flags &= ~(PMU_FL_EXCL_CNTRS | PMU_FL_EXCL_ENABLED); + + x86_pmu.commit_scheduling = NULL; + x86_pmu.start_scheduling = NULL; + x86_pmu.stop_scheduling = NULL; + + watchdog_nmi_enable_all(); + + get_online_cpus(); + + for_each_online_cpu(c) { + free_excl_cntrs(c); + } + + put_online_cpus(); + pr_info("PMU erratum BJ122, BV98, HSD29 workaround disabled, HT off\n"); + return 0; +} +subsys_initcall(fixup_ht_bug) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/