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=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,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 C9CF5C43381 for ; Tue, 12 Mar 2019 18:11:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8E920205C9 for ; Tue, 12 Mar 2019 18:11:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1552414291; bh=frMGLSDIt0EFRHP5EAgm4ASXqeRu6y+CQHOm3ajtv3o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=mBPMQuZVPbJI/2/vh+hzhm1qkNnDGSjDHVPq9Sz9FZaIA55nKs9ULZOkelrX75gMq eSFpBIeIuhESeu6ij65jgllAl6T7W+8F4pICjp7Kn24eehSW1qKx7A1mTQEop4p4Fy A21n7NtgKyr+PJCbiZhYLJhai417YV0nrGaLJg5c= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727875AbfCLSL3 (ORCPT ); Tue, 12 Mar 2019 14:11:29 -0400 Received: from mail.kernel.org ([198.145.29.99]:45342 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727034AbfCLRLj (ORCPT ); Tue, 12 Mar 2019 13:11:39 -0400 Received: from localhost (unknown [104.133.8.98]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 38D0A21741; Tue, 12 Mar 2019 17:11:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1552410698; bh=frMGLSDIt0EFRHP5EAgm4ASXqeRu6y+CQHOm3ajtv3o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ydf1MMwnSdIhKPZrUxxzYmBgEOBn/af9LnC9doS+pZYe+9RxchZqEqw2rmW1cbxjI 8UBrOf5gO0s5CtuRluK5xOv2QDcO4oY3lYVY3Nc6+nFSi0ZAt1cCWtHvCv/Tf9o54r Ue5KIjyNr/6fXw2xx0JtfEUkyWGCm6hClc/ttsjs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Peter Zijlstra (Intel)" , Thomas Gleixner Subject: [PATCH 5.0 25/25] perf/x86/intel: Implement support for TSX Force Abort Date: Tue, 12 Mar 2019 10:09:03 -0700 Message-Id: <20190312170405.612480217@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190312170403.643852550@linuxfoundation.org> References: <20190312170403.643852550@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 5.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: "Peter Zijlstra (Intel)" Skylake (and later) will receive a microcode update to address a TSX errata. This microcode will, on execution of a TSX instruction (speculative or not) use (clobber) PMC3. This update will also provide a new MSR to change this behaviour along with a CPUID bit to enumerate the presence of this new MSR. When the MSR gets set; the microcode will no longer use PMC3 but will Force Abort every TSX transaction (upon executing COMMIT). When TSX Force Abort (TFA) is allowed (default); the MSR gets set when PMC3 gets scheduled and cleared when, after scheduling, PMC3 is unused. When TFA is not allowed; clear PMC3 from all constraints such that it will not get used. Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Thomas Gleixner Signed-off-by: Greg Kroah-Hartman --- arch/x86/events/intel/core.c | 74 +++++++++++++++++++++++++++++++++++++++++-- arch/x86/events/perf_event.h | 6 +++ 2 files changed, 77 insertions(+), 3 deletions(-) --- a/arch/x86/events/intel/core.c +++ b/arch/x86/events/intel/core.c @@ -1999,6 +1999,39 @@ static void intel_pmu_nhm_enable_all(int intel_pmu_enable_all(added); } +static void intel_set_tfa(struct cpu_hw_events *cpuc, bool on) +{ + u64 val = on ? MSR_TFA_RTM_FORCE_ABORT : 0; + + if (cpuc->tfa_shadow != val) { + cpuc->tfa_shadow = val; + wrmsrl(MSR_TSX_FORCE_ABORT, val); + } +} + +static void intel_tfa_commit_scheduling(struct cpu_hw_events *cpuc, int idx, int cntr) +{ + /* + * We're going to use PMC3, make sure TFA is set before we touch it. + */ + if (cntr == 3 && !cpuc->is_fake) + intel_set_tfa(cpuc, true); +} + +static void intel_tfa_pmu_enable_all(int added) +{ + struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); + + /* + * If we find PMC3 is no longer used when we enable the PMU, we can + * clear TFA. + */ + if (!test_bit(3, cpuc->active_mask)) + intel_set_tfa(cpuc, false); + + intel_pmu_enable_all(added); +} + static void enable_counter_freeze(void) { update_debugctlmsr(get_debugctlmsr() | @@ -3354,6 +3387,26 @@ glp_get_event_constraints(struct cpu_hw_ return c; } +static bool allow_tsx_force_abort = true; + +static struct event_constraint * +tfa_get_event_constraints(struct cpu_hw_events *cpuc, int idx, + struct perf_event *event) +{ + struct event_constraint *c = hsw_get_event_constraints(cpuc, idx, event); + + /* + * Without TFA we must not use PMC3. + */ + if (!allow_tsx_force_abort && test_bit(3, c->idxmsk)) { + c = dyn_constraint(cpuc, c, idx); + c->idxmsk64 &= ~(1ULL << 3); + c->weight--; + } + + return c; +} + /* * Broadwell: * @@ -3448,13 +3501,15 @@ int intel_cpuc_prepare(struct cpu_hw_eve goto err; } - if (x86_pmu.flags & PMU_FL_EXCL_CNTRS) { + if (x86_pmu.flags & (PMU_FL_EXCL_CNTRS | PMU_FL_TFA)) { size_t sz = X86_PMC_IDX_MAX * sizeof(struct event_constraint); cpuc->constraint_list = kzalloc_node(sz, GFP_KERNEL, cpu_to_node(cpu)); if (!cpuc->constraint_list) goto err_shared_regs; + } + if (x86_pmu.flags & PMU_FL_EXCL_CNTRS) { cpuc->excl_cntrs = allocate_excl_cntrs(cpu); if (!cpuc->excl_cntrs) goto err_constraint_list; @@ -3564,9 +3619,10 @@ static void free_excl_cntrs(struct cpu_h if (c->core_id == -1 || --c->refcnt == 0) kfree(c); cpuc->excl_cntrs = NULL; - kfree(cpuc->constraint_list); - cpuc->constraint_list = NULL; } + + kfree(cpuc->constraint_list); + cpuc->constraint_list = NULL; } static void intel_pmu_cpu_dying(int cpu) @@ -4086,8 +4142,11 @@ static struct attribute *intel_pmu_caps_ NULL }; +DEVICE_BOOL_ATTR(allow_tsx_force_abort, 0644, allow_tsx_force_abort); + static struct attribute *intel_pmu_attrs[] = { &dev_attr_freeze_on_smi.attr, + NULL, /* &dev_attr_allow_tsx_force_abort.attr.attr */ NULL, }; @@ -4580,6 +4639,15 @@ __init int intel_pmu_init(void) tsx_attr = hsw_tsx_events_attrs; intel_pmu_pebs_data_source_skl( boot_cpu_data.x86_model == INTEL_FAM6_SKYLAKE_X); + + if (boot_cpu_has(X86_FEATURE_TSX_FORCE_ABORT)) { + x86_pmu.flags |= PMU_FL_TFA; + x86_pmu.get_event_constraints = tfa_get_event_constraints; + x86_pmu.enable_all = intel_tfa_pmu_enable_all; + x86_pmu.commit_scheduling = intel_tfa_commit_scheduling; + intel_pmu_attrs[1] = &dev_attr_allow_tsx_force_abort.attr.attr; + } + pr_cont("Skylake events, "); name = "skylake"; break; --- a/arch/x86/events/perf_event.h +++ b/arch/x86/events/perf_event.h @@ -243,6 +243,11 @@ struct cpu_hw_events { int excl_thread_id; /* 0 or 1 */ /* + * SKL TSX_FORCE_ABORT shadow + */ + u64 tfa_shadow; + + /* * AMD specific bits */ struct amd_nb *amd_nb; @@ -681,6 +686,7 @@ do { \ #define PMU_FL_EXCL_CNTRS 0x4 /* has exclusive counter requirements */ #define PMU_FL_EXCL_ENABLED 0x8 /* exclusive counter active */ #define PMU_FL_PEBS_ALL 0x10 /* all events are valid PEBS events */ +#define PMU_FL_TFA 0x20 /* deal with TSX force abort */ #define EVENT_VAR(_id) event_attr_##_id #define EVENT_PTR(_id) &event_attr_##_id.attr.attr