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 91762CCA476 for ; Fri, 10 Oct 2025 16:54:42 +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:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=1NjotFNrLBVpEkqG0+JhI7+0eyANRi86p9aT12SGJfI=; b=kwyU/ZuL1wqE4myqJvo2IFDouE p7+X8HvDezu8s2ugGdJnVhPsYPdrVVt1USVwIFpjrMshgDOHB1+yeWb2jIY+p+QmDX83BLkA5ZbkZ biX8W7e7ec/B4taZnP0ijsuI2z+FwFyo2z+ADnjvU6c/S/LaAwYLJLL6MoUvvOA1Pe9h5OfbgRohQ HMIwh8oLEMvZcecQmtqQGkZj3afsx+SyJd1kvy6t4WLjiKboYk/gaQR1yndQqWT59BacL8gtNQdXG ZYfdM/7OuZrN+KAK/jswGnse61ktMxqhs7jaNqOllefFCt5I3gYHOizbgJjCSkJ/s/YRmRpvUTGks Wj9diYxw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1v7GO5-000000090Rs-32rs; Fri, 10 Oct 2025 16:54:37 +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 1v7GO4-000000090Qn-03PH for linux-arm-kernel@lists.infradead.org; Fri, 10 Oct 2025 16:54:37 +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 3AEDA153B; Fri, 10 Oct 2025 09:54:27 -0700 (PDT) Received: from [10.1.197.69] (eglon.cambridge.arm.com [10.1.197.69]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 2D77B3F66E; Fri, 10 Oct 2025 09:54:22 -0700 (PDT) Message-ID: <219dff63-11ad-4eb4-8499-2c5085181339@arm.com> Date: Fri, 10 Oct 2025 17:54:19 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 01/29] ACPI / PPTT: Add a helper to fill a cpumask from a processor container To: Stanimir Varbanov , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org Cc: 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 , 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 , Catalin Marinas , Will Deacon , Greg Kroah-Hartman , Danilo Krummrich References: <20250910204309.20751-1-james.morse@arm.com> <20250910204309.20751-2-james.morse@arm.com> <3d2252ef-92a2-4717-a472-3e5b275419ce@suse.de> Content-Language: en-GB From: James Morse In-Reply-To: <3d2252ef-92a2-4717-a472-3e5b275419ce@suse.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251010_095436_095759_EB1E33AF X-CRM114-Status: GOOD ( 13.65 ) 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 Hi Stan, On 25/09/2025 10:32, Stanimir Varbanov wrote: > On 9/10/25 11:42 PM, James Morse wrote: >> The ACPI MPAM table uses the UID of a processor container specified in >> the PPTT to indicate the subset of CPUs and cache topology that can >> access each MPAM System Component (MSC). >> >> This information is not directly useful to the kernel. The equivalent >> cpumask is needed instead. >> >> 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. >> + >> +/** >> + * acpi_pptt_get_cpus_from_container() - Populate a cpumask with all CPUs in a >> + * processor container >> + * @acpi_cpu_id: The UID of the processor container. >> + * @cpus: The resulting CPU mask. >> + * >> + * Find the specified Processor Container, and fill @cpus with all the cpus >> + * below it. >> + * >> + * Not all 'Processor' entries in the PPTT are either a CPU or a Processor >> + * 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. > > Leftover, drop this. Good spot - thanks, James