From patchwork Mon Apr 13 06:38:38 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiang Liu X-Patchwork-Id: 6206231 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 9F4ABBF4A6 for ; Mon, 13 Apr 2015 06:36:31 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 83FF9201EC for ; Mon, 13 Apr 2015 06:36:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7CD9B201B9 for ; Mon, 13 Apr 2015 06:36:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752609AbbDMGg2 (ORCPT ); Mon, 13 Apr 2015 02:36:28 -0400 Received: from mga11.intel.com ([192.55.52.93]:49997 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751498AbbDMGg1 (ORCPT ); Mon, 13 Apr 2015 02:36:27 -0400 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga102.fm.intel.com with ESMTP; 12 Apr 2015 23:36:16 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.11,568,1422950400"; d="scan'208";a="694323781" Received: from gerry-dev.bj.intel.com ([10.238.158.72]) by fmsmga001.fm.intel.com with ESMTP; 12 Apr 2015 23:36:13 -0700 From: Jiang Liu To: "Rafael J . Wysocki" , Bjorn Helgaas , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , x86@kernel.org, Len Brown Cc: Jiang Liu , Lv Zheng , LKML , linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org Subject: [Bugfix v5] x86/PCI/ACPI: Fix regression caused by commit 63f1789ec716 Date: Mon, 13 Apr 2015 14:38:38 +0800 Message-Id: <1428907118-27099-1-git-send-email-jiang.liu@linux.intel.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <552B4698.4020703@linux.intel.com> References: <552B4698.4020703@linux.intel.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Before commit 593669c2ac0f("Use common ACPI resource interfaces to simplify implementation"), arch/x86/pci/acpi.c applies following rules when parsing ACPI resources for PCI host bridge: 1) Ignore IO port resources defined by acpi_resource_io and acpi_resource_fixed_io, which should be used to define resource for PCI device instead of PCI bridge. 2) Accept IOMEM resource defined by acpi_resource_memory24, acpi_resource_memory32 and acpi_resource_fixed_memory32. These IOMEM resources are accepted to workaround some BIOS issue, though they should be ignored. For example, PC Engines APU.1C platform defines PCI host bridge IOMEM resources as: Memory32Fixed (ReadOnly, 0x000A0000, // Address Base 0x00020000, // Address Length ) Memory32Fixed (ReadOnly, 0x00000000, // Address Base 0x00000000, // Address Length _Y00) 3) Accept all IO port and IOMEM resources defined by acpi_resource_address{16,32,64,extended64}, no matter it's marked as ACPI_CONSUMER or ACPI_PRODUCER. Commit 593669c2ac0f("Use common ACPI resource interfaces to simplify implementation") accept all IO port and IOMEM resources defined by acpi_resource_io, acpi_resource_fixed_io, acpi_resource_memory24, acpi_resource_memory32, acpi_resource_fixed_memory32 and acpi_resource_address{16,32,64,extended64}, which causes IO port resources consumed by host bridge itself are listed in to host bridge resource list. Then commit 63f1789ec716("Ignore resources consumed by host bridge itself") ignores resources consumed by host bridge itself by checking IORESOURCE_WINDOW flag, which accidently removed the workaround in 2) above for BIOS bug . So revert to the behavior before v3.19 to fix the regression. Sample ACPI table are archived at: https://bugzilla.kernel.org/show_bug.cgi?id=94221 Fixes: 63f1789ec716("Ignore resources consumed by host bridge itself") Reported-and-Tested-by: Bernhard Thaler Signed-off-by: Jiang Liu --- arch/x86/pci/acpi.c | 25 ++++++++++++++++++++++--- drivers/acpi/resource.c | 6 +++++- 2 files changed, 27 insertions(+), 4 deletions(-) diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c index e4695985f9de..fc2da98985c3 100644 --- a/arch/x86/pci/acpi.c +++ b/arch/x86/pci/acpi.c @@ -332,12 +332,32 @@ static void probe_pci_root_info(struct pci_root_info *info, { int ret; struct resource_entry *entry, *tmp; + unsigned long res_flags; sprintf(info->name, "PCI Bus %04x:%02x", domain, busnum); info->bridge = device; + + /* + * An IO or MMIO resource assigned to PCI host bridge may be consumed + * by the host bridge itself or available to its child bus/devices. + * On x86 and IA64 platforms, all IO and MMIO resources are assumed to + * be available to child bus/devices except one special case: + * IO port [0xCF8-0xCFF] is consumed by host bridge itself to + * access PCI configuration space. + * + * Due to lack of specification to define resources consumed by host + * bridge itself, all IO port resources defined by acpi_resource_io + * and acpi_resource_fixed_io are ignored to filter out IO + * port[0xCF8-0xCFF]. Seems this solution works with all BIOSes, though + * it's not perfect. + * + * Another possible solution is to explicitly filter out IO + * port[0xCF8-0xCFF]. + */ + res_flags = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_IO_FIXED; ret = acpi_dev_get_resources(device, list, acpi_dev_filter_resource_type_cb, - (void *)(IORESOURCE_IO | IORESOURCE_MEM)); + (void *)res_flags); if (ret < 0) dev_warn(&device->dev, "failed to parse _CRS method, error code %d\n", ret); @@ -346,8 +366,7 @@ static void probe_pci_root_info(struct pci_root_info *info, "no IO and memory resources present in _CRS\n"); else resource_list_for_each_entry_safe(entry, tmp, list) { - if ((entry->res->flags & IORESOURCE_WINDOW) == 0 || - (entry->res->flags & IORESOURCE_DISABLED)) + if (entry->res->flags & IORESOURCE_DISABLED) resource_list_destroy_entry(entry); else entry->res->name = info->name; diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c index 5589a6e2a023..79b6d3b5ffd2 100644 --- a/drivers/acpi/resource.c +++ b/drivers/acpi/resource.c @@ -575,6 +575,9 @@ EXPORT_SYMBOL_GPL(acpi_dev_get_resources); * * This is a hepler function to support acpi_dev_get_resources(), which filters * ACPI resource objects according to resource types. + * + * Flag IORESOURCE_IO_FIXED is used to opt out io and fixed_io resource + * descriptors for ACPI host bridges on x86 and IA64 platforms. */ int acpi_dev_filter_resource_type(struct acpi_resource *ares, unsigned long types) @@ -589,7 +592,8 @@ int acpi_dev_filter_resource_type(struct acpi_resource *ares, break; case ACPI_RESOURCE_TYPE_IO: case ACPI_RESOURCE_TYPE_FIXED_IO: - type = IORESOURCE_IO; + if ((types & IORESOURCE_IO_FIXED) == 0) + type = IORESOURCE_IO; break; case ACPI_RESOURCE_TYPE_IRQ: case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: