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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7A6D4C35273 for ; Tue, 8 Feb 2022 22:34:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1388260AbiBHWch (ORCPT ); Tue, 8 Feb 2022 17:32:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37596 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1386854AbiBHVRN (ORCPT ); Tue, 8 Feb 2022 16:17:13 -0500 Received: from mail-pl1-x649.google.com (mail-pl1-x649.google.com [IPv6:2607:f8b0:4864:20::649]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B4A8BC0612B8 for ; Tue, 8 Feb 2022 13:17:10 -0800 (PST) Received: by mail-pl1-x649.google.com with SMTP id 4-20020a170902c20400b0014d61c5a5b1so302826pll.14 for ; Tue, 08 Feb 2022 13:17:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=dEWqa6ll67+XS8zqG5upDAQcRA944Vkil3rbd3Ql4r0=; b=sVdAXqy5YQYAyluM+87YKfNCyBV41r86ejBj1FZy0iA4BBvN7GyaIF7fUMqCc+x/pR 8VaW5oS5h4lk16chyDzoA1ASUeb97LlgAQ009oc06roZ37sE3wf8pUuVgPP4ZcaAR4hZ vJ6X9lVX6jY7pSAHG4tInnGftXISZvlNNqCYV2cYohESxGprVC4FN/GYHZ9RfRjg7zR4 n0wwD1Gj8Q0EQzGErPr+CURkEsZcDXmOjfcJuz4KVCfLdbWVJFyMoFfLaUyeXRekAzm1 1H6Ebs+yaye61ncsW9WC5qeOfNfFO9mVZ5IaiW6YkiAT3ecuOrNST+6t8Mp7gk9Wyo2R fO9A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=dEWqa6ll67+XS8zqG5upDAQcRA944Vkil3rbd3Ql4r0=; b=JcE94RaSMDa+3ldSc1bFKrbUPpP81irz3UjZ1SpGXn8S1sXByQstvRAHjailH86lmH W8K4m3I3MCaxBBYfDnCWBMrztvAapUzC2VP+zNuR67j2zwHu32Fpg1WQWLUDN0DoLvUv 7i+BGQF6q4ZkWoVr/OrSDrj1gNdWfCTKrkutvga527MSJjmaCvE/tnXYwPdP4TYLgu0U cAy33MP6raefnhg4fl4eKCSTXWh/8Fxlmv6X15hz3pdushWPucwxpj72OBx3/GlAVnUJ LEVV9R5sd+J5fBHnX8zPcdyPaB30kj6V30aU/ftutRiZah0FtM7pMRmYNaC9OwPFU6wI 8HRQ== X-Gm-Message-State: AOAM530p0Ck6NpBT/qeAeOAo6jKBxs7/YYTmCq9a5WP9Adm//uTVT0SW KMp9JPVdtgH/JeQARkScfLZjoif7lMIt26nrDMaNVSO8HDUbFJBobf4EpjTVHN1C6j+bf8HSh5b J/voAvP9V//4xvzVeTZ516sERKC3jZjYdrcIOvHAzd++xtsq2qiMHKqIoQU8RjgbMEpmdjSBC X-Google-Smtp-Source: ABdhPJwHX2WZBSwLZnHLKP/cSYAhGuwYChAF9oD04o7EmDNAEjoAD27twBuQi5uJjrewhDa+XJlVUiGvJuSJ X-Received: from uluru3.svl.corp.google.com ([2620:15c:2cd:202:6875:3c51:69be:6e2c]) (user=eranian job=sendgmr) by 2002:a17:902:6a83:: with SMTP id n3mr6441644plk.139.1644355030018; Tue, 08 Feb 2022 13:17:10 -0800 (PST) Date: Tue, 8 Feb 2022 13:16:32 -0800 In-Reply-To: <20220208211637.2221872-1-eranian@google.com> Message-Id: <20220208211637.2221872-8-eranian@google.com> Mime-Version: 1.0 References: <20220208211637.2221872-1-eranian@google.com> X-Mailer: git-send-email 2.35.0.263.gb82422642f-goog Subject: [PATCH v6 07/12] perf/x86/amd: make Zen3 branch sampling opt-in From: Stephane Eranian To: linux-kernel@vger.kernel.org Cc: peterz@infradead.org, kim.phillips@amd.com, acme@redhat.com, jolsa@redhat.com, songliubraving@fb.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a kernel config option CONFIG_PERF_EVENTS_AMD_BRS to make the support for AMD Zen3 Branch Sampling (BRS) an opt-in compile time option. Signed-off-by: Stephane Eranian --- arch/x86/events/Kconfig | 8 ++++++ arch/x86/events/amd/Makefile | 3 ++- arch/x86/events/perf_event.h | 49 ++++++++++++++++++++++++++++-------- 3 files changed, 49 insertions(+), 11 deletions(-) diff --git a/arch/x86/events/Kconfig b/arch/x86/events/Kconfig index d6cdfe631674..09c56965750a 100644 --- a/arch/x86/events/Kconfig +++ b/arch/x86/events/Kconfig @@ -44,4 +44,12 @@ config PERF_EVENTS_AMD_UNCORE To compile this driver as a module, choose M here: the module will be called 'amd-uncore'. + +config PERF_EVENTS_AMD_BRS + depends on PERF_EVENTS && CPU_SUP_AMD + bool "AMD Zen3 Branch Sampling support" + help + Enable AMD Zen3 branch sampling support (BRS) which samples up to + 16 consecutive taken branches in registers. + endmenu diff --git a/arch/x86/events/amd/Makefile b/arch/x86/events/amd/Makefile index cf323ffab5cd..b9f5d4610256 100644 --- a/arch/x86/events/amd/Makefile +++ b/arch/x86/events/amd/Makefile @@ -1,5 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 -obj-$(CONFIG_CPU_SUP_AMD) += core.o brs.o +obj-$(CONFIG_CPU_SUP_AMD) += core.o +obj-$(CONFIG_PERF_EVENTS_AMD_BRS) += brs.o obj-$(CONFIG_PERF_EVENTS_AMD_POWER) += power.o obj-$(CONFIG_X86_LOCAL_APIC) += ibs.o obj-$(CONFIG_PERF_EVENTS_AMD_UNCORE) += amd-uncore.o diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h index 25b037b571e4..4d050579dcbd 100644 --- a/arch/x86/events/perf_event.h +++ b/arch/x86/events/perf_event.h @@ -1218,6 +1218,8 @@ static inline bool fixed_counter_disabled(int i, struct pmu *pmu) #ifdef CONFIG_CPU_SUP_AMD int amd_pmu_init(void); + +#ifdef CONFIG_PERF_EVENTS_AMD_BRS int amd_brs_init(void); void amd_brs_disable(void); void amd_brs_enable(void); @@ -1252,25 +1254,52 @@ static inline void amd_pmu_brs_del(struct perf_event *event) void amd_pmu_brs_sched_task(struct perf_event_context *ctx, bool sched_in); -/* - * check if BRS is activated on the CPU - * active defined as it has non-zero users and DBG_EXT_CFG.BRSEN=1 - */ -static inline bool amd_brs_active(void) +static inline s64 amd_brs_adjust_period(s64 period) { - struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); + if (period > x86_pmu.lbr_nr) + return period - x86_pmu.lbr_nr; - return cpuc->brs_active; + return period; +} +#else +static inline int amd_brs_init(void) +{ + return 0; } +static inline void amd_brs_disable(void) {} +static inline void amd_brs_enable(void) {} +static inline void amd_brs_drain(void) {} +static inline void amd_brs_lopwr_init(void) {} +static inline void amd_brs_disable_all(void) {} +static inline int amd_brs_setup_filter(struct perf_event *event) +{ + return 0; +} +static inline void amd_brs_reset(void) {} -static inline s64 amd_brs_adjust_period(s64 period) +static inline void amd_pmu_brs_add(struct perf_event *event) { - if (period > x86_pmu.lbr_nr) - return period - x86_pmu.lbr_nr; +} + +static inline void amd_pmu_brs_del(struct perf_event *event) +{ +} + +static inline void amd_pmu_brs_sched_task(struct perf_event_context *ctx, bool sched_in) +{ +} +static inline s64 amd_brs_adjust_period(s64 period) +{ return period; } +static inline void amd_brs_enable_all(void) +{ +} + +#endif + #else /* CONFIG_CPU_SUP_AMD */ static inline int amd_pmu_init(void) -- 2.35.0.263.gb82422642f-goog