From patchwork Wed Jun 22 07:40:19 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: 9192133 X-Patchwork-Delegate: bhelgaas@google.com 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 420386075C for ; Wed, 22 Jun 2016 07:58:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 33D03283E6 for ; Wed, 22 Jun 2016 07:58:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 28188283ED; Wed, 22 Jun 2016 07:58:56 +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 C0FBD283E6 for ; Wed, 22 Jun 2016 07:58:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752112AbcFVH6y (ORCPT ); Wed, 22 Jun 2016 03:58:54 -0400 Received: from mga01.intel.com ([192.55.52.88]:46975 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751906AbcFVH6x (ORCPT ); Wed, 22 Jun 2016 03:58:53 -0400 Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga101.fm.intel.com with ESMTP; 22 Jun 2016 00:55:50 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.26,509,1459839600"; d="scan'208";a="1002853537" Received: from wr-optiplex-9010.xa.intel.com ([10.238.71.86]) by orsmga002.jf.intel.com with ESMTP; 22 Jun 2016 00:55:46 -0700 From: Rui Wang To: helgaas@kernel.org Cc: tglx@linutronix.de, rjw@rjwysocki.net, 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 V4 1/3] x86/ioapic: Support hot-removal of IOAPICs present during boot Date: Wed, 22 Jun 2016 15:40:19 +0800 Message-Id: <1466581219-20538-1-git-send-email-rui.y.wang@intel.com> X-Mailer: git-send-email 1.7.5.4 In-Reply-To: <20160616170958.GA7250@localhost> References: <20160616170958.GA7250@localhost> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP v4: Add comments explaining when to call acpi_ioapic_add(). v3: Previous versions break mips. This version fixes it. 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/internal.h | 2 -- drivers/acpi/ioapic.c | 7 ++++--- drivers/acpi/pci_root.c | 13 ++++++++++++- drivers/pci/setup-bus.c | 7 ++++++- include/linux/acpi.h | 3 +++ 5 files changed, 25 insertions(+), 7 deletions(-) diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h index 27cc7fe..6d8e67e 100644 --- a/drivers/acpi/internal.h +++ b/drivers/acpi/internal.h @@ -40,10 +40,8 @@ int acpi_sysfs_init(void); void acpi_container_init(void); void acpi_memory_hotplug_init(void); #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC -int acpi_ioapic_add(struct acpi_pci_root *root); int acpi_ioapic_remove(struct acpi_pci_root *root); #else -static inline int acpi_ioapic_add(struct acpi_pci_root *root) { return 0; } static inline int acpi_ioapic_remove(struct acpi_pci_root *root) { return 0; } #endif #ifdef CONFIG_ACPI_DOCK diff --git a/drivers/acpi/ioapic.c b/drivers/acpi/ioapic.c index ccdc8db..0f272e2 100644 --- a/drivers/acpi/ioapic.c +++ b/drivers/acpi/ioapic.c @@ -189,16 +189,17 @@ exit: return AE_OK; } -int acpi_ioapic_add(struct acpi_pci_root *root) +int acpi_ioapic_add(acpi_handle root_handle) { acpi_status status, retval = AE_OK; - status = acpi_walk_namespace(ACPI_TYPE_DEVICE, root->device->handle, + status = acpi_walk_namespace(ACPI_TYPE_DEVICE, root_handle, UINT_MAX, handle_ioapic_add, NULL, - root->device->handle, (void **)&retval); + root_handle, (void **)&retval); return ACPI_SUCCESS(status) && ACPI_SUCCESS(retval) ? 0 : -ENODEV; } +EXPORT_SYMBOL_GPL(acpi_ioapic_add); int acpi_ioapic_remove(struct acpi_pci_root *root) { diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index ae3fe4e..31e4440 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -614,7 +614,18 @@ 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); - acpi_ioapic_add(root); + + /* + * 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); } pci_lock_rescan_remove(); diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index 55641a3..0658921 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; @@ -1779,8 +1780,12 @@ 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); +#ifdef CONFIG_X86 + acpi_ioapic_add(ACPI_HANDLE(root_bus->bridge)); +#endif + } } void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge) diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 288fac5..3ed22df 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -262,6 +262,9 @@ int acpi_unmap_cpu(int cpu); #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr); +int acpi_ioapic_add(acpi_handle root); +#else +static inline int acpi_ioapic_add(acpi_handle root) { return 0; } #endif int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base);