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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,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 11CECC433ED for ; Fri, 2 Apr 2021 13:32:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D3F30610D2 for ; Fri, 2 Apr 2021 13:32:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234161AbhDBNcD (ORCPT ); Fri, 2 Apr 2021 09:32:03 -0400 Received: from mout.kundenserver.de ([217.72.192.74]:42851 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229932AbhDBNcD (ORCPT ); Fri, 2 Apr 2021 09:32:03 -0400 Received: from [192.168.1.155] ([95.118.52.208]) by mrelayeu.kundenserver.de (mreue108 [212.227.15.183]) with ESMTPSA (Nemesis) id 1MfpKZ-1m7xFf3xRx-00gEPf; Fri, 02 Apr 2021 15:31:51 +0200 Subject: Re: [PATCH] platform/x86: intel_pmc_core: export platform global_reset via sysfs. To: Tomas Winkler , Rajneesh Bhardwaj , David E Box , Hans de Goede , Mark Gross Cc: platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org, Tamar Mashiah , Andy Shevchenko References: <20210401213144.1009224-1-tomas.winkler@intel.com> From: "Enrico Weigelt, metux IT consult" Message-ID: Date: Fri, 2 Apr 2021 15:31:49 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.9.0 MIME-Version: 1.0 In-Reply-To: <20210401213144.1009224-1-tomas.winkler@intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: tl Content-Transfer-Encoding: 8bit X-Provags-ID: V03:K1:IZu7NSzQEdCaYaop5YZYea5lfTlHFn4m6/du8f79d+chvvJdTbJ GoShAPEkxR3vPrar/3Utbf2kjaDOuQIUIqZZXPTdoBoUWwalMwIHmNVXlonzm8RtOhe1BZa 0+vKpTk1MLoToSWAurd3eeM3iSstaH1SAqthJlK1gZ6GLqK+K6Y7Jew5r+glvWEjpDpGBbr 6EFIhglDGJ5jPiwJN4LSQ== X-UI-Out-Filterresults: notjunk:1;V03:K0:+IWMqBpt+/U=:pn+iKmMLb+Mm1y73/k7FgN ug+msfUqiHCnXrfGEp24dtGv+Pxi2/IrKt9XI/djlpb1EBakRTXXGJDBZamUh696avsrZrbdu wYaQyRb1lGH6JSEM1i926u0OslC/x2iaklAqB1YYZknQ+J9PAwLFwvCxAY7TxQKHNh/En336M ug2BfBTSNUMGEGzoLyLwWlWsaPNJ9FO2Bi+nt6yl0UuNU/tcL1EpKV9cDozZJzun9C50DTMmY ijXRDubX99HVCaRxT88niu7DPz/VTghcG8voRqxDW2MwvL6T0fPGQiwLIT4QBPEBir9TQA61H ALTKeaOobN5mltky0yhFY23tkkljhMoyAmka5DxPTKD0Zb3y9M2URMqKcvvLrwcHkkXnykqKV ATBArGE2Wxasbzni5OrPw25yqDlOhM9a5JM05aQHG2X47x62OTVRmFS+NeEh5MiJEGuyEmdAV Tmdnn6HvcFS2fZ68I7Eocpfgh5zORhYF37xrO2cda6/CgwoG6HJs Precedence: bulk List-ID: X-Mailing-List: platform-driver-x86@vger.kernel.org On 01.04.21 23:31, Tomas Winkler wrote: Hi, > During PCH manufacturing a global reset has to be induced in order > for configuration changes take affect upon following platform reset. > This setting was commonly done by accessing PMC registers via /dev/mem > but due to security concern /dev/mem access is much restricted, hence > the reason for exposing this setting via dedicated sysfs interface. > To prevent post manufacturing abuse the register is protected > by hardware locking. could you please define "manufacturing" ? The chip or board ? Is there any use for this, after the machine left the factory ? --mtx -- --- Hinweis: unverschlüsselte E-Mails können leicht abgehört und manipuliert werden ! Für eine vertrauliche Kommunikation senden Sie bitte ihren GPG/PGP-Schlüssel zu. --- Enrico Weigelt, metux IT consult Free software and Linux embedded engineering info@metux.net -- +49-151-27565287