From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 99683214A91; Fri, 22 Aug 2025 15:31:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755876679; cv=none; b=o9MRDfEDgSzH3tmHugepRxDrt8may88a5eEG86xNBwT5i7DEVHo2O9Xvwcpf1VzQ6z9YLBehxxbdyF4ATBmpStzFcIfxJlNG7SBNCoO60DJKjw0UbbSUR3kBMhjIv6KAlnZtn2sv401M7EdXHrPAmJHPiKAQmutz7Do+Qip25t8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755876679; c=relaxed/simple; bh=JNA8Ju3yLzQ5/rM7Bi6nt9PNOG5Nj2I/hDTMXTvlsIg=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=mUhQ5tlcyhVEKDsYTNKytYdAKokOym0T5WjjxLKMoCfEh4HXpnWj6CMXZltmsfCDc5na8/u/sMrY7aKZ0jQidOMuGLHw74lc1YFUB0YEUMIRZ+NVyisPNvdXMxv+3U55X/MApHMtJrh9gZyHplFpnNgEW+RcGv/96ebvA+4TRp8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com 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 D773F15A1; Fri, 22 Aug 2025 08:31:08 -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 CAA2C3F63F; Fri, 22 Aug 2025 08:31:11 -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 15:29:43 +0000 Message-Id: <20250822153048.2287-3-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> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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