From patchwork Wed Aug 10 04:01:55 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Wang, Rui Y" X-Patchwork-Id: 9272657 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 1ECDB600CA for ; Wed, 10 Aug 2016 04:19:22 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0936F28389 for ; Wed, 10 Aug 2016 04:19:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F21AD28419; Wed, 10 Aug 2016 04:19:21 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9E8B528389 for ; Wed, 10 Aug 2016 04:19:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751076AbcHJES3 (ORCPT ); Wed, 10 Aug 2016 00:18:29 -0400 Received: from mga09.intel.com ([134.134.136.24]:30603 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750724AbcHJESZ (ORCPT ); Wed, 10 Aug 2016 00:18:25 -0400 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga102.jf.intel.com with ESMTP; 09 Aug 2016 21:18:25 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.28,497,1464678000"; d="scan'208";a="1038381970" Received: from wr-optiplex-9010.xa.intel.com ([10.238.71.86]) by fmsmga002.fm.intel.com with ESMTP; 09 Aug 2016 21:18:23 -0700 From: Rui Wang To: helgaas@kernel.org, tglx@linutronix.de, rjw@rjwysocki.net Cc: tony.luck@intel.com, bhelgaas@google.com, linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, rui.y.wang@intel.com Subject: [PATCH v3 2/5] x86/ioapic: Support hot-removal of IOAPICs present during boot Date: Wed, 10 Aug 2016 12:01:55 +0800 Message-Id: <1470801718-29004-3-git-send-email-rui.y.wang@intel.com> X-Mailer: git-send-email 1.7.5.4 In-Reply-To: <1470801718-29004-1-git-send-email-rui.y.wang@intel.com> References: <1470801718-29004-1-git-send-email-rui.y.wang@intel.com> Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP IOAPICs present during system boot aren't added to ioapic_list, thus are unable to be hot-removed. Fix it by calling acpi_ioapic_add() during root bus enumeration. Signed-off-by: Rui Wang --- drivers/acpi/pci_root.c | 10 ++++++++++ drivers/pci/setup-bus.c | 5 ++++- 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index b07eda1..bf601d4 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -614,6 +614,16 @@ static int acpi_pci_root_add(struct acpi_device *device, if (hotadd) { pcibios_resource_survey_bus(root->bus); pci_assign_unassigned_root_bus_resources(root->bus); + /* + * This is only called for the hotadd case. For the boot-time + * case, we need to wait until after PCI initialization in + * order to deal with IOAPICs mapped in on a PCI BAR. + * + * This is currently x86-specific, because acpi_ioapic_add() + * is an empty function without CONFIG_ACPI_HOTPLUG_IOAPIC. + * And CONFIG_ACPI_HOTPLUG_IOAPIC depends on CONFIG_X86_IO_APIC + * (see drivers/acpi/Kconfig). + */ acpi_ioapic_add(root->device->handle); } diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index c74059e..ec538d3 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -25,6 +25,7 @@ #include #include #include +#include #include "pci.h" unsigned int pci_flags; @@ -1852,8 +1853,10 @@ void __init pci_assign_unassigned_resources(void) { struct pci_bus *root_bus; - list_for_each_entry(root_bus, &pci_root_buses, node) + list_for_each_entry(root_bus, &pci_root_buses, node) { pci_assign_unassigned_root_bus_resources(root_bus); + acpi_ioapic_add(ACPI_HANDLE(root_bus->bridge)); + } } void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)