From patchwork Wed Oct 19 08:22:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 5357 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4ac7:0:0:0:0:0 with SMTP id y7csp298239wrs; Wed, 19 Oct 2022 05:30:10 -0700 (PDT) X-Google-Smtp-Source: AMsMyM72ZtosrHgwcxrkhetUO7+f1sfBkUG9OzJQtfgBmGVvMgH7yo6pr52/wMM4JOb/Yb9ccCPq X-Received: by 2002:a17:902:6a87:b0:181:c6c6:1d38 with SMTP id n7-20020a1709026a8700b00181c6c61d38mr8183897plk.74.1666182610673; Wed, 19 Oct 2022 05:30:10 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1666182610; cv=none; d=google.com; s=arc-20160816; b=06exaVqu0wg35+acaqcQ+LDFGWy6tfd2I2B6nIcfRIuyISbTAFyUEOYlFoEktMVAAP o+TnoIeSvVOz6isEb9jQQoRRtyMQJYun1C9SjwJvEaj1frDDqayx7pbD5e/bD+ReEM9n aCBXGP4hA3BewQSLMmiw3HYGthv1OdDJP94PD+xt5iRheeIMnzQBnIe78RIOG2nK7/yo HiyoixgzzuWjET9X+PiuBoumvFqyDnKDgY5cAIZki2oldg4ic5OplwJesSFwp2dlXAkw lpnYjofJRwgfngANUxP1+E6K3OvREr2X9N0U/OEW2eqknDN5cIgd6R4DHlGcg3o4iFuT jkUg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :user-agent:references:in-reply-to:message-id:date:subject:cc:to :from:dkim-signature; bh=Df9u8FN84hNypRsXoyD5eqGGFY76K8WcBVsj+F67qgc=; b=s1zjmXELSvV/oJD3JjtvmTTEeP+8aYUv3ehpRZZMQaCHvTUkYO3TQFGY7Q2Kcz2IMt rhKZtRVPpiexyoMscGIMgzDOMcdgUrbey4zcKBFc6/StO3DZONMlDgDFQEiEjDAnUS1l Q0jHkLBp+eRb10tCAxZGYduAX/+W6p4a+G6lPnY0LfP26Yr+pnZEIpALv5CMzILz/U2T w2YByXCS5vlPOqeynZ5dVlbyCVmK1XNzJDM3/DKKJ9QCr27RDLGy9KgvKC41nJwuGeU+ 1/S6no7h+snXKR9XsTsZAC65BMVV8em/reOCoxdfSgp8LqkGD68pMiFUJXpaOAjLNjpS HSwg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linuxfoundation.org header.s=korg header.b=CgcDRmfB; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linuxfoundation.org Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id q14-20020a17090311ce00b001789fa8f90esi20935314plh.408.2022.10.19.05.29.56; Wed, 19 Oct 2022 05:30:10 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@linuxfoundation.org header.s=korg header.b=CgcDRmfB; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linuxfoundation.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233044AbiJSMTc (ORCPT + 99 others); Wed, 19 Oct 2022 08:19:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36032 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232515AbiJSMSu (ORCPT ); Wed, 19 Oct 2022 08:18:50 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D5EF34057D; Wed, 19 Oct 2022 04:54:03 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id E018BB822D1; Wed, 19 Oct 2022 08:41:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2FD25C433C1; Wed, 19 Oct 2022 08:41:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666168893; bh=14mKDapbgbuh31OpS2MIP0VbUg71zVnPdpLmFUC99dY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CgcDRmfBEb49+QMIR5yQjxQlo65we6mF4NExLEK0DBFXFl1G6mkQUFq2WaitP5+C8 cxh8OUphrAIaR6wftULc47DOLv9uxImsDsCToj49EQzrjDOWmvgJvtXSg6c+2+2IKI KhpXOXpiIVIF2jXCRyvr/+5GJepcJSyF6jN5+VCo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Maciej W. Rozycki" , Bjorn Helgaas Subject: [PATCH 6.0 089/862] PCI: Sanitise firmware BAR assignments behind a PCI-PCI bridge Date: Wed, 19 Oct 2022 10:22:56 +0200 Message-Id: <20221019083253.874350484@linuxfoundation.org> X-Mailer: git-send-email 2.38.0 In-Reply-To: <20221019083249.951566199@linuxfoundation.org> References: <20221019083249.951566199@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 X-Spam-Status: No, score=-7.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1747119097072299658?= X-GMAIL-MSGID: =?utf-8?q?1747119097072299658?= From: Maciej W. Rozycki commit 0e32818397426a688f598f35d3bc762eca6d7592 upstream. When pci_assign_resource() is unable to assign resources to a BAR, it uses pci_revert_fw_address() to fall back to a firmware assignment (if any). Previously pci_revert_fw_address() assumed all addresses could reach the device, but this is not true if the device is below a bridge that only forwards addresses within its windows. This problem was observed on a Tyan Tomcat IV S1564D system where the BIOS did not assign valid addresses to several bridges and USB devices: pci 0000:00:11.0: PCI-to-PCIe bridge to [bus 01-ff] pci 0000:00:11.0: bridge window [io 0xe000-0xefff] pci 0000:01:00.0: PCIe Upstream Port to [bus 02-ff] pci 0000:01:00.0: bridge window [io 0x0000-0x0fff] # unreachable pci 0000:02:02.0: PCIe Downstream Port to [bus 05-ff] pci 0000:02:02.0: bridge window [io 0x0000-0x0fff] # unreachable pci 0000:05:00.0: PCIe-to-PCI bridge to [bus 06-ff] pci 0000:05:00.0: bridge window [io 0x0000-0x0fff] # unreachable pci 0000:06:08.0: USB UHCI 1.1 pci 0000:06:08.0: BAR 4: [io 0xfce0-0xfcff] # unreachable pci 0000:06:08.1: USB UHCI 1.1 pci 0000:06:08.1: BAR 4: [io 0xfce0-0xfcff] # unreachable pci 0000:06:08.0: can't claim BAR 4 [io 0xfce0-0xfcff]: no compatible bridge window pci 0000:06:08.1: can't claim BAR 4 [io 0xfce0-0xfcff]: no compatible bridge window During the first pass of assigning unassigned resources, there was not enough I/O space available, so we couldn't assign the 06:08.0 BAR and reverted to the firmware assignment (still unreachable). Reverting the 06:08.1 assignment failed because it conflicted with 06:08.0: pci 0000:00:11.0: bridge window [io 0xe000-0xefff] pci 0000:01:00.0: no space for bridge window [io size 0x2000] pci 0000:02:02.0: no space for bridge window [io size 0x1000] pci 0000:05:00.0: no space for bridge window [io size 0x1000] pci 0000:06:08.0: BAR 4: no space for [io size 0x0020] pci 0000:06:08.0: BAR 4: trying firmware assignment [io 0xfce0-0xfcff] pci 0000:06:08.1: BAR 4: no space for [io size 0x0020] pci 0000:06:08.1: BAR 4: trying firmware assignment [io 0xfce0-0xfcff] pci 0000:06:08.1: BAR 4: [io 0xfce0-0xfcff] conflicts with 0000:06:08.0 [io 0xfce0-0xfcff] A subsequent pass assigned valid bridge windows and a valid 06:08.1 BAR, but left the 06:08.0 BAR alone, so the UHCI device was still unusable: pci 0000:00:11.0: bridge window [io 0xe000-0xefff] released pci 0000:00:11.0: bridge window [io 0x1000-0x2fff] # reassigned pci 0000:01:00.0: bridge window [io 0x1000-0x2fff] # reassigned pci 0000:02:02.0: bridge window [io 0x2000-0x2fff] # reassigned pci 0000:05:00.0: bridge window [io 0x2000-0x2fff] # reassigned pci 0000:06:08.0: BAR 4: assigned [io 0xfce0-0xfcff] # left alone pci 0000:06:08.1: BAR 4: assigned [io 0x2000-0x201f] ... uhci_hcd 0000:06:08.0: host system error, PCI problems? uhci_hcd 0000:06:08.0: host controller process error, something bad happened! uhci_hcd 0000:06:08.0: host controller halted, very bad! uhci_hcd 0000:06:08.0: HCRESET not completed yet! uhci_hcd 0000:06:08.0: HC died; cleaning up If the address assigned by firmware is not reachable because it's not within upstream bridge windows, fail instead of assigning the unusable address from firmware. [bhelgaas: commit log, use pci_upstream_bridge()] Link: https://bugzilla.kernel.org/show_bug.cgi?id=16263 Link: https://lore.kernel.org/r/alpine.DEB.2.21.2203012338460.46819@angie.orcam.me.uk Link: https://lore.kernel.org/r/alpine.DEB.2.21.2209211921250.29493@angie.orcam.me.uk Fixes: 58c84eda0756 ("PCI: fall back to original BIOS BAR addresses") Signed-off-by: Maciej W. Rozycki Signed-off-by: Bjorn Helgaas Cc: stable@vger.kernel.org # v2.6.35+ Signed-off-by: Greg Kroah-Hartman --- drivers/pci/setup-res.c | 11 +++++++++++ 1 file changed, 11 insertions(+) --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -214,6 +214,17 @@ static int pci_revert_fw_address(struct root = pci_find_parent_resource(dev, res); if (!root) { + /* + * If dev is behind a bridge, accesses will only reach it + * if res is inside the relevant bridge window. + */ + if (pci_upstream_bridge(dev)) + return -ENXIO; + + /* + * On the root bus, assume the host bridge will forward + * everything. + */ if (res->flags & IORESOURCE_IO) root = &ioport_resource; else