From patchwork Thu Dec 16 23:31:21 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rob Herring \(Arm\)" X-Patchwork-Id: 525279 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 E5C22C4332F for ; Thu, 16 Dec 2021 23:31:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229494AbhLPXbc (ORCPT ); Thu, 16 Dec 2021 18:31:32 -0500 Received: from mail-oi1-f180.google.com ([209.85.167.180]:35398 "EHLO mail-oi1-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229648AbhLPXba (ORCPT ); Thu, 16 Dec 2021 18:31:30 -0500 Received: by mail-oi1-f180.google.com with SMTP id m6so1171584oim.2; Thu, 16 Dec 2021 15:31:30 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=XJxuQtRLTVfIiHxosQQwj5MJ9jgW00UdvVH4T37a4e0=; b=XBuaIGSmeZnCZwdW/QkU7UDvP7DuL7eUGodLzs7bCXGQOUuHRTMsE/9o44IZ20G+Sw lNKu0KdKuuBCdGPrgT6dOQ3A0xyf4KsXNKScDfVrCaRtquNEmE8kn6w3blxbj00eF922 d6syGkP8OgQqxS5QFw0lUswOyWWDNf37VUT0c4YUyr/swTKDVu50Q+HE1v962Z/EqBCw 25GgI92WBOgKGocMUpc/FqZ7tEyi9EXBD7q5rpVaUPUUsPk+w9omSWEMEx1D9OWuAkM5 /Mmx062hWGqLKbasCxuAUDDD/UOPKPtPAljOZLx8Ua+teKhp06ZImk5+IGbTwCaysaff EWgg== X-Gm-Message-State: AOAM5318Rgkfayjgo1VrkRn73VB+PqAda10IP4daYGrleLXxkZ94bmkS w5guH6RASBDHi9MXjUMEb/LG5V9hzQ== X-Google-Smtp-Source: ABdhPJy3osxEec/uFfDfvEc9vw+RCg25N1CQDsD8MFEWyLn67kai6YEnfUJhllbsJNoUI1R1/4kVtg== X-Received: by 2002:a05:6808:4d2:: with SMTP id a18mr136647oie.99.1639697489825; Thu, 16 Dec 2021 15:31:29 -0800 (PST) Received: from xps15.herring.priv (66-90-148-213.dyn.grandenetworks.net. [66.90.148.213]) by smtp.googlemail.com with ESMTPSA id n11sm1256646oor.9.2021.12.16.15.31.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Dec 2021 15:31:29 -0800 (PST) From: Rob Herring To: Greg Kroah-Hartman , James Morse , Jeremy Linton Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Sudeep Holla , "Rafael J. Wysocki" , Len Brown , devicetree@vger.kernel.org, linux-acpi@vger.kernel.org Subject: [PATCH 2/6] cacheinfo: Set cache 'id' based on DT data Date: Thu, 16 Dec 2021 17:31:21 -0600 Message-Id: <20211216233125.1130793-3-robh@kernel.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211216233125.1130793-1-robh@kernel.org> References: <20211216233125.1130793-1-robh@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Use the minimum CPU h/w id of the CPUs associated with the cache for the cache 'id'. This will provide a stable id value for a given system. As we need to check all possible CPUs, we can't use the shared_cpu_map which is just online CPUs. There's not a cache to CPUs mapping in DT, so we have to walk all CPU nodes and then walk cache levels. Cc: Greg Kroah-Hartman Cc: "Rafael J. Wysocki" Signed-off-by: Rob Herring --- v2: - Loop with for_each_possible_cpu instead of for_each_of_cpu_node as we will need the logical cpu numbers. --- drivers/base/cacheinfo.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c index 66d10bdb863b..21accddf8f5f 100644 --- a/drivers/base/cacheinfo.c +++ b/drivers/base/cacheinfo.c @@ -136,6 +136,36 @@ static bool cache_node_is_unified(struct cacheinfo *this_leaf, return of_property_read_bool(np, "cache-unified"); } +static void cache_of_set_id(struct cacheinfo *this_leaf, struct device_node *np) +{ + int cpu; + unsigned long min_id = ~0UL; + + for_each_possible_cpu(cpu) { + u64 id; + struct device_node *cache_node, *cpu_node; + + cache_node = cpu_node = of_get_cpu_node(cpu, NULL); + id = of_get_cpu_hwid(cpu_node, 0); + while ((cache_node = of_find_next_cache_node(cache_node))) { + if (cache_node == np) { + if (id < min_id) { + min_id = id; + of_node_put(cache_node); + break; + } + } + of_node_put(cache_node); + } + of_node_put(cpu_node); + } + + if (min_id != ~0UL) { + this_leaf->id = min_id; + this_leaf->attributes |= CACHE_ID; + } +} + static void cache_of_set_props(struct cacheinfo *this_leaf, struct device_node *np) { @@ -151,6 +181,7 @@ static void cache_of_set_props(struct cacheinfo *this_leaf, cache_get_line_size(this_leaf, np); cache_nr_sets(this_leaf, np); cache_associativity(this_leaf); + cache_of_set_id(this_leaf, np); } static int cache_setup_of_node(unsigned int cpu)