From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2158221D3CD for ; Tue, 22 Jul 2025 14:28:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.176.79.56 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753194495; cv=none; b=FKYAPQtkZnciHDAtq7TOlB9Bjtf5oSkqSgR6XM6i0ZcD3pYZtFOtPLs71OaN40GWcBlbAQwTuO7tihTpryfXNiYi7ee7dEYrocI3yEpRtxS9HnZg6Rj6kp4bsv98qqy+VM6EeBY+FfprdR4RhaphMQW8P+ajTlbkTblyXGX1l6o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753194495; c=relaxed/simple; bh=B3bygHlyEuQarYDMb68vgIOtWnbigauGCxhWDgOrMho=; h=Date:From:To:CC:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=m9EzSSdfiA2xUm3dw/t7qDJgEeN1NNhnLPdSuFl68ZJqCci+ceQIpaoW3t6+oHpIraw1BqC3v9XqIvOEhbMRcyZoVNbofjRqCTWTuGWLmvVZAOffdqbU+2Nfekp7p8T8IZ60qrpnNcTyGiliga/c6vLvq9Q/9CfBBsI4msQXDsU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=185.176.79.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com 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) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: lhrpeml500006.china.huawei.com (7.191.161.198) To frapeml500008.china.huawei.com (7.182.85.71) 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)