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 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 28794CA0EFA for ; Sat, 23 Aug 2025 10:49:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=32Cha62zLMX/sE9V8V6uhkKRa58D9zB/ZV8x/qJtq+0=; b=xTigqs0ZNrAW3PYzXBfMFh4aCv aQchli5PiK1rp3iKtust+KC79ySRO4UXc3VSsuh4XEtENtHm4W0jbg6smLNg99dCRgNC7kl4cSbfI KFsvNP598nEkyGy0gMbilY6b1kGxRh1NWp6GBqaARgVqx2c2WhPEyNxHZhaqRh/ACpHRi4LWxHc4l sbyqOViQrRZXMUvuQR8sZAX5FKS94+KuvThjdQlGZ7hoMAvB3yHeDFmQx1m0fZClrM+glwVYe6v61 m8/WwSqFx9/Wgrmh+/AROXWLRWZN2rzMzYFqGQAvlFj64Syr3b5HGfvxtvKLzroZvllAKkbANqrzu 2+KAayNQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uploY-00000004f5S-2KIy; Sat, 23 Aug 2025 10:49:38 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1upTmg-000000032PR-0Ybn for linux-arm-kernel@lists.infradead.org; Fri, 22 Aug 2025 15:34:31 +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 5061C15A1; Fri, 22 Aug 2025 08:34:21 -0700 (PDT) Received: from merodach.members.linode.com (usa-sjc-mx-foss1.foss.arm.com [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 42F7A3F63F; Fri, 22 Aug 2025 08:34:24 -0700 (PDT) From: James Morse To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org, devicetree@vger.kernel.org Cc: James Morse , shameerali.kolothum.thodi@huawei.com, D Scott Phillips OS , carl@os.amperecomputing.com, lcherian@marvell.com, bobo.shaobowang@huawei.com, tan.shaopeng@fujitsu.com, baolin.wang@linux.alibaba.com, Jamie Iles , Xin Hao , peternewman@google.com, dfustini@baylibre.com, amitsinght@marvell.com, David Hildenbrand , Rex Nie , Dave Martin , Koba Ko , Shanker Donthineni , fenghuay@nvidia.com, baisheng.gao@unisoc.com, Jonathan Cameron , Rob Herring , Rohit Mathew , Rafael Wysocki , Len Brown , Lorenzo Pieralisi , Hanjun Guo , Sudeep Holla , Krzysztof Kozlowski , Conor Dooley , Catalin Marinas , Will Deacon , Greg Kroah-Hartman , Danilo Krummrich Subject: [PATCH 02/33] drivers: base: cacheinfo: Add helper to find the cache size from cpu+level Date: Fri, 22 Aug 2025 15:30:17 +0000 Message-Id: <20250822153048.2287-37-james.morse@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20250822153048.2287-1-james.morse@arm.com> References: <20250822153048.2287-1-james.morse@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250822_083430_220498_5387A6D2 X-CRM114-Status: GOOD ( 11.03 ) 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 MPAM needs to know the size of a cache associated with a particular CPU. The DT/ACPI agnostic way of doing this is to ask cacheinfo. Add a helper to do this. Signed-off-by: James Morse --- Changes since v1: * Converted to kdoc. * Simplified helper to use get_cpu_cacheinfo_level(). --- include/linux/cacheinfo.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h index 2dcbb69139e9..e12d6f2c6a57 100644 --- a/include/linux/cacheinfo.h +++ b/include/linux/cacheinfo.h @@ -148,6 +148,21 @@ static inline int get_cpu_cacheinfo_id(int cpu, int level) return ci ? ci->id : -1; } +/** + * get_cpu_cacheinfo_size() - Get the size of the cache. + * @cpu: The cpu that is associated with the cache. + * @level: The level of the cache as seen by @cpu. + * + * Callers must hold the cpuhp lock. + * Returns the cache-size on success, or 0 for an error. + */ +static inline unsigned int get_cpu_cacheinfo_size(int cpu, int level) +{ + struct cacheinfo *ci = get_cpu_cacheinfo_level(cpu, level); + + return ci ? ci->size : 0; +} + #if defined(CONFIG_ARM64) || defined(CONFIG_ARM) #define use_arch_cache_info() (true) #else -- 2.20.1