From patchwork Fri Jul 15 10:26:09 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sudeep Holla X-Patchwork-Id: 12918987 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 0E0A7C433EF for ; Fri, 15 Jul 2022 10:27:05 +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=W39YmLPlNgDLNVo+/FGGq46PQu5W/7GEjyDeYhkTcAs=; b=WlxGTbjiblYEyW GlCaxXw0Usd+uajvIg7+r4B5jsEDwQAaFbieit4gfawdqEpvtNhshT7/YYIBBnZdmFCxKQ0FiYY9k HieYoyAOA08FvesRt3jd4l1t0J+zQzAXx3VoE2W4sFtKgIAkcJkrwIrqExaVbWDQ2SMgvLI07diGv WTnB0YFiMdLjFer3wRBgFg1irmkbguhfeikbLsmxYiIRYLmgr/phEgf6s01Ds29yigjAf2LTYaofy u3H0htxjEpEGDgktVtxHYcUpwn8HLXJOtbIoyq9IvTLGvK7VWDJD+7iBx6Ih8PvHnSdrLFnAaIIV4 Bf7y5ou248/sXWixqt3A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oCIX7-006KrY-0S; Fri, 15 Jul 2022 10:26:53 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oCIWm-006KmE-Nb; Fri, 15 Jul 2022 10:26:34 +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 DB4281D13; Fri, 15 Jul 2022 03:26:21 -0700 (PDT) Received: from usa.arm.com (e103737-lin.cambridge.arm.com [10.1.197.49]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 1E0403F792; Fri, 15 Jul 2022 03:26:20 -0700 (PDT) From: Sudeep Holla To: linux-kernel@vger.kernel.org, Greg Kroah-Hartman , Conor Dooley Cc: Sudeep Holla , Vincent Guittot , Dietmar Eggemann , Ionela Voinescu , Pierre Gondois , linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org Subject: [PATCH -next v2 2/2] arch_topology: Fix cache attributes detection in the CPU hotplug path Date: Fri, 15 Jul 2022 11:26:09 +0100 Message-Id: <20220715102609.2160689-2-sudeep.holla@arm.com> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220715102609.2160689-1-sudeep.holla@arm.com> References: <20220715102609.2160689-1-sudeep.holla@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220715_032632_838518_AD40FFDE X-CRM114-Status: GOOD ( 13.15 ) X-BeenThere: linux-riscv@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-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org init_cpu_topology() is called only once at the boot and all the cache attributes are detected early for all the possible CPUs. However when the CPUs are hotplugged out, the cacheinfo gets removed. While the attributes are added back when the CPUs are hotplugged back in as part of CPU hotplug state machine, it ends up called quite late after the update_siblings_masks() are called in the secondary_start_kernel() resulting in wrong llc_sibling_masks. Move the call to detect_cache_attributes() inside update_siblings_masks() to ensure the cacheinfo is updated before the LLC sibling masks are updated. This will fix the incorrect LLC sibling masks generated when the CPUs are hotplugged out and hotplugged back in again. Reported-by: Ionela Voinescu Tested-by: Ionela Voinescu Reviewed-by: Conor Dooley Reviewed-by: Ionela Voinescu Signed-off-by: Sudeep Holla Tested-by: Geert Uytterhoeven --- drivers/base/arch_topology.c | 16 ++++++---------- 1 file changed, 6 insertions(+), 10 deletions(-) v1->v2: - No change in this patch, but 1/2 was added to fix possible bug "sleeping in the atomic context" with this patch. - Added all the received tags -- 2.37.1 diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c index 441e14ac33a4..0424b59b695e 100644 --- a/drivers/base/arch_topology.c +++ b/drivers/base/arch_topology.c @@ -732,7 +732,11 @@ const struct cpumask *cpu_clustergroup_mask(int cpu) void update_siblings_masks(unsigned int cpuid) { struct cpu_topology *cpu_topo, *cpuid_topo = &cpu_topology[cpuid]; - int cpu; + int cpu, ret; + + ret = detect_cache_attributes(cpuid); + if (ret) + pr_info("Early cacheinfo failed, ret = %d\n", ret); /* update core and thread sibling masks */ for_each_online_cpu(cpu) { @@ -821,7 +825,7 @@ __weak int __init parse_acpi_topology(void) #if defined(CONFIG_ARM64) || defined(CONFIG_RISCV) void __init init_cpu_topology(void) { - int ret, cpu; + int ret; reset_cpu_topology(); ret = parse_acpi_topology(); @@ -836,13 +840,5 @@ void __init init_cpu_topology(void) reset_cpu_topology(); return; } - - for_each_possible_cpu(cpu) { - ret = detect_cache_attributes(cpu); - if (ret) { - pr_info("Early cacheinfo failed, ret = %d\n", ret); - break; - } - } } #endif