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 2AE27C83F1A for ; Tue, 22 Jul 2025 15:58:52 +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: Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Subject:CC:To: From:Date:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Lkqk3GmyGUv2A8kEAkTb58VZlsk88hdNWO/g4AHrcn0=; b=CyEsx24TtdrYChecFRf4uKQD/p rJwo77/Siscm3yaW5urjYFt4qg8m9OTCCQR8XABEqX53dgPgYZ8C/3pQaEUGRDZYbwcXzp1GUh6Az DHmtYCRYZ3I4JzD881Z58aC3tKoRPeU+bl0FwOEm+8az/QFkAH/CcEF5IPAY7aqJWT7jD9vnWukRu dvSY6NpM+X/OoC/nIo5lpfXh1fDbKYEdgEMozHu4lv/y6ipjlbUX6eKqJ0R4o1jGdTzKuVPhaLQsN wi8I6phGDB2V2Yu/XyiSFXmTBkKOgras9riWi8W8fk6knPJI/iLcubtf9y9HWILK/yxo/CC2rtYbn TTwzNgSQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1ueFNv-00000002vup-2EdU; Tue, 22 Jul 2025 15:58:31 +0000 Received: from frasgout.his.huawei.com ([185.176.79.56]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1ueDya-00000002hfA-2aBp for linux-arm-kernel@lists.infradead.org; Tue, 22 Jul 2025 14:28:17 +0000 Received: from mail.maildlp.com (unknown [172.18.186.31]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4bmffD2LSjz6L4sV; Tue, 22 Jul 2025 22:24:20 +0800 (CST) Received: from frapeml500008.china.huawei.com (unknown [7.182.85.71]) by mail.maildlp.com (Postfix) with ESMTPS id A7A961402C8; Tue, 22 Jul 2025 22:28:10 +0800 (CST) Received: from localhost (10.203.177.66) by frapeml500008.china.huawei.com (7.182.85.71) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Tue, 22 Jul 2025 16:28:09 +0200 Date: Tue, 22 Jul 2025 15:28:07 +0100 From: Jonathan Cameron To: James Morse CC: , , "Rob Herring" , Ben Horgan , Rohit Mathew , Shanker Donthineni , "Zeng Heng" , Lecopzer Chen , "Carl Worth" , , D Scott Phillips OS , , , , , Jamie Iles , Xin Hao , , , , David Hildenbrand , Rex Nie , Dave Martin , Koba Ko , Sudeep Holla Subject: Re: [RFC PATCH 05/36] ACPI / PPTT: Add a helper to fill a cpumask from a processor container Message-ID: <20250722152807.000069d3@huawei.com> In-Reply-To: <20250711183648.30766-6-james.morse@arm.com> References: <20250711183648.30766-1-james.morse@arm.com> <20250711183648.30766-6-james.morse@arm.com> X-Mailer: Claws Mail 4.3.0 (GTK 3.24.42; x86_64-w64-mingw32) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.203.177.66] X-ClientProxiedBy: lhrpeml500006.china.huawei.com (7.191.161.198) To frapeml500008.china.huawei.com (7.182.85.71) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250722_072816_796700_232692FC X-CRM114-Status: GOOD ( 14.04 ) 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 On Fri, 11 Jul 2025 18:36:17 +0000 James Morse wrote: > The PPTT describes CPUs and caches, as well as processor containers. > The ACPI table for MPAM describes the set of CPUs that can access an MSC > with the UID of a processor container. >=20 > Add a helper to find the processor container by its id, then walk > the possible CPUs to fill a cpumask with the CPUs that have this > processor container as a parent. >=20 > CC: Dave Martin > Reviewed-by: Sudeep Holla > Signed-off-by: James Morse > +/** > + * acpi_pptt_get_cpus_from_container() - Populate a cpumask with all CPU= s in a > + * processor containers > + * @acpi_cpu_id: The UID of the processor container. > + * @cpus The resulting CPU mask. Missing colon. =46rom a W=3D1 build (and hence kernel-doc warning). > + * > + * Find the specified Processor Container, and fill @cpus with all the c= pus > + * below it. > + * > + * Not all 'Processor' entries in the PPTT are either a CPU or a Process= or > + * Container, they may exist purely to describe a Private resource. CPUs > + * have to be leaves, so a Processor Container is a non-leaf that has the > + * 'ACPI Processor ID valid' flag set. > + * > + * Return: 0 for a complete walk, or an error if the mask is incomplete. > + */ > +int acpi_pptt_get_cpus_from_container(u32 acpi_cpu_id, cpumask_t *cpus)