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,URIBL_BLOCKED,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 778ADC433DF for ; Thu, 28 May 2020 15:45:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 528B2207BC for ; Thu, 28 May 2020 15:45:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404591AbgE1PpP (ORCPT ); Thu, 28 May 2020 11:45:15 -0400 Received: from mx3.molgen.mpg.de ([141.14.17.11]:51223 "EHLO mx1.molgen.mpg.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2404587AbgE1PpN (ORCPT ); Thu, 28 May 2020 11:45:13 -0400 Received: from [192.168.0.7] (ip5f5af798.dynamic.kabel-deutschland.de [95.90.247.152]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pmenzel) by mx.molgen.mpg.de (Postfix) with ESMTPSA id 66828206442FF; Thu, 28 May 2020 17:45:11 +0200 (CEST) To: Bjorn Helgaas , "Rafael J. Wysocki" , Len Brown Cc: linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, Thomas Lendacky , Mario Limonciello From: Paul Menzel Subject: AMD Ryzen: pci 0000:00:00.2: can't derive routing for PCI INT A Message-ID: <8579bd14-e369-1141-917b-204d20cff528@molgen.mpg.de> Date: Thu, 28 May 2020 17:45:10 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Dear Linux folks, On most (if not all) AMD Ryzen systems, including the Dell OptiPlex 5055, [1][2], Linux prints the warning below: $ dmesg --level=warn [ 0.871377] pci 0000:00:00.2: can't derive routing for PCI INT A [ 0.871732] pci 0000:00:00.2: PCI INT A: not connected [ 0.884890] PPR NX GT IA GA PC GA_vAPIC $ more /proc/version Linux version 5.4.39.mx64.334 (root@lol.molgen.mpg.de) (gcc version 7.5.0 (GCC)) #1 SMP Thu May 7 14:27:50 CEST 2020 pmenzel@donut:~$ dmesg | grep 'DMI:' [ 0.000000] DMI: Dell Inc. OptiPlex 5055 Ryzen CPU/0P03DX, BIOS 1.1.20 05/31/2019 The system seems to work fine. What effect might be caused by the missing routing information? I assume this is a firmware issue? Can I patch the ACPI tables to provide the correct information? Should this indeed be an AMD AGESA issue, it be great, if somebody with contacts at AMD could be forward this to the appropriate folks. Kind regards, Paul [1]: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1804589 [2]: https://bugs.launchpad.net/dell-sputnik/+bug/1881121