From patchwork Tue Oct 17 05:23:20 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeremy Linton X-Patchwork-Id: 13424448 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DA68DCDB474 for ; Tue, 17 Oct 2023 05:24:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=1ZnineDssjoiscJFEN6e3L0tPOrXsn3fsRzv0XW6PHI=; b=Qn86lWx8BneqQ9 86u2Z5AsjHvmplhXzXAbks6OxAJGoRZ+EpZsDf2ynB1130K5mPQhXelHGYdVoZ0RFlr/Az4zrH5hW /bAQ6VMA9VWpwpA+lfrr5m1Nr4hdpRk+Ndo70v3ef3t2jyTITFW5EZlXpgrRaoRRxy75Qah75bl/H 9mGOrzEV1zhOWinxsFddRssNJCSWxDNdMsDszvmqjpaAThLFQcofh9KivPHO4qayUo5pkVkW3nI/Y KHXo5hf6/xJotuGq/9Fqehd+2aPc29bkgjzqvPYooxCQPp7r7H/p53ppuehqS4+opM61Bv3EehVgN BrgCA9KPly0PQIVxFOZQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qscYc-00BHbN-1g; Tue, 17 Oct 2023 05:23:54 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qscYO-00BHXU-1l for linux-arm-kernel@lists.infradead.org; Tue, 17 Oct 2023 05:23:43 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id BD9D72F4; Mon, 16 Oct 2023 22:24:13 -0700 (PDT) Received: from u200865.usa.arm.com (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 0347E3F5A1; Mon, 16 Oct 2023 22:23:32 -0700 (PDT) From: Jeremy Linton To: linux-arm-kernel@lists.infradead.org Cc: catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, maz@kernel.org, anshuman.khandual@arm.com, krisman@suse.de, broonie@kernel.org, james.morse@arm.com, ionela.voinescu@arm.com, linux-kernel@vger.kernel.org, Jeremy Linton Subject: [PATCH v2 1/3] arm64: cpufeature: Display the set of cores with a feature Date: Tue, 17 Oct 2023 00:23:20 -0500 Message-ID: <20231017052322.1211099-2-jeremy.linton@arm.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231017052322.1211099-1-jeremy.linton@arm.com> References: <20231017052322.1211099-1-jeremy.linton@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231016_222340_694467_4CC39C18 X-CRM114-Status: GOOD ( 17.89 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The AMU feature can be enabled on a subset of the cores in a system. Because of that, it prints a message for each core as it is detected. This becomes tedious when there are hundreds of cores. Instead, for CPU features which can be enabled on a subset of the present cores, lets wait until update_cpu_capabilities() and print the subset of cores the feature was enabled on. Signed-off-by: Jeremy Linton Reviewed-by: Ionela Voinescu Tested-by: Ionela Voinescu Reviewed-by: Punit Agrawal Tested-by: Punit Agrawal --- arch/arm64/include/asm/cpufeature.h | 2 ++ arch/arm64/kernel/cpufeature.c | 22 +++++++++++++--------- 2 files changed, 15 insertions(+), 9 deletions(-) diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 5bba39376055..19b4d001d845 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -23,6 +23,7 @@ #include #include #include +#include /* * CPU feature register tracking @@ -380,6 +381,7 @@ struct arm64_cpu_capabilities { * method is robust against being called multiple times. */ const struct arm64_cpu_capabilities *match_list; + const struct cpumask *cpus; }; static inline int cpucap_default_scope(const struct arm64_cpu_capabilities *cap) diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 444a73c2e638..2dd695fc3472 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1944,8 +1944,6 @@ int get_cpu_with_amu_feat(void) static void cpu_amu_enable(struct arm64_cpu_capabilities const *cap) { if (has_cpuid_feature(cap, SCOPE_LOCAL_CPU)) { - pr_info("detected CPU%d: Activity Monitors Unit (AMU)\n", - smp_processor_id()); cpumask_set_cpu(smp_processor_id(), &amu_cpus); /* 0 reference values signal broken/disabled counters */ @@ -2405,16 +2403,12 @@ static const struct arm64_cpu_capabilities arm64_features[] = { #endif /* CONFIG_ARM64_RAS_EXTN */ #ifdef CONFIG_ARM64_AMU_EXTN { - /* - * The feature is enabled by default if CONFIG_ARM64_AMU_EXTN=y. - * Therefore, don't provide .desc as we don't want the detection - * message to be shown until at least one CPU is detected to - * support the feature. - */ + .desc = "Activity Monitors Unit (AMU)", .capability = ARM64_HAS_AMU_EXTN, .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE, .matches = has_amu, .cpu_enable = cpu_amu_enable, + .cpus = &amu_cpus, ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, AMU, IMP) }, #endif /* CONFIG_ARM64_AMU_EXTN */ @@ -2981,7 +2975,7 @@ static void update_cpu_capabilities(u16 scope_mask) !caps->matches(caps, cpucap_default_scope(caps))) continue; - if (caps->desc) + if (caps->desc && !caps->cpus) pr_info("detected: %s\n", caps->desc); __set_bit(caps->capability, system_cpucaps); @@ -3330,6 +3324,7 @@ unsigned long cpu_get_elf_hwcap2(void) static void __init setup_system_capabilities(void) { + int i; /* * We have finalised the system-wide safe feature * registers, finalise the capabilities that depend @@ -3338,6 +3333,15 @@ static void __init setup_system_capabilities(void) */ update_cpu_capabilities(SCOPE_SYSTEM); enable_cpu_capabilities(SCOPE_ALL & ~SCOPE_BOOT_CPU); + + for (i = 0; i < ARM64_NCAPS; i++) { + const struct arm64_cpu_capabilities *caps = cpucap_ptrs[i]; + + if (caps && caps->cpus && caps->desc && + cpumask_any(caps->cpus) < nr_cpu_ids) + pr_info("detected: %s on CPU%*pbl\n", + caps->desc, cpumask_pr_args(caps->cpus)); + } } void __init setup_cpu_features(void)