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 X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 28904C2D0DB for ; Tue, 28 Jan 2020 12:34:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ED7682064C for ; Tue, 28 Jan 2020 12:34:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725977AbgA1MeT (ORCPT ); Tue, 28 Jan 2020 07:34:19 -0500 Received: from foss.arm.com ([217.140.110.172]:56188 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725948AbgA1MeT (ORCPT ); Tue, 28 Jan 2020 07:34:19 -0500 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 A3346101E; Tue, 28 Jan 2020 04:34:18 -0800 (PST) Received: from bogus (e103737-lin.cambridge.arm.com [10.1.197.49]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 366903F52E; Tue, 28 Jan 2020 04:34:17 -0800 (PST) Date: Tue, 28 Jan 2020 12:34:15 +0000 From: Sudeep Holla To: John Garry Cc: rjw@rjwysocki.net, lenb@kernel.org, jeremy.linton@arm.com, arnd@arndb.de, olof@lixom.net, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, guohanjun@huawei.com, gregkh@linuxfoundation.org, Sudeep Holla Subject: Re: [PATCH RFC 1/2] ACPI/PPTT: Add acpi_pptt_get_package_info() API Message-ID: <20200128123415.GB36168@bogus> References: <1580210059-199540-1-git-send-email-john.garry@huawei.com> <1580210059-199540-2-git-send-email-john.garry@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1580210059-199540-2-git-send-email-john.garry@huawei.com> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org On Tue, Jan 28, 2020 at 07:14:18PM +0800, John Garry wrote: > The ACPI PPTT ID structure (see 6.2 spec, section 5.2.29.3) allows the > vendor to provide an identifier (or vendor specific part number) for a > particular processor hierarchy node structure. That may be a processor > identifier for a processor node, or some chip identifier for a processor > package node. > Unfortunately, there were plans to deprecate this in favour of the new SOC_ID SMCCC API[1]. I am not sure if you or anyone in your company have access to UEFI ASWG mantis where you can look for the ECR for the PPTT Type 2 deprecation. I understand it's not ideal, but we need to converge, please take a look at both before further discussion. I personally would not prefer to add the support when I know it is getting deprecated. I am not sure on kernel community policy on the same. [...] > > The ID structure table has a number of fields, which are left open to > interpretation per implementation. However the spec does provide reference > examples of how the fields could be used. As such, just provide the > table fields directly in the API, which the caller may interpret (probably > as per spec example). > The "open for interpretation" part is why it's not being favoured anymore by silicon vendors as OEM/ODMs can override the same. > https://lore.kernel.org/linux-arm-kernel/1579876505-113251-6-git-send-email-john.garry@huawei.com/ > Ah, there's already quite a lot of dependency built for this feature :( -- Regards, Sudeep [1] https://developer.arm.com/docs/den0028/c