From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751757AbdB0OcZ (ORCPT ); Mon, 27 Feb 2017 09:32:25 -0500 Received: from mga05.intel.com ([192.55.52.43]:61082 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751714AbdB0OcV (ORCPT ); Mon, 27 Feb 2017 09:32:21 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.35,215,1484035200"; d="scan'208";a="1116131722" 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, x86@kernel.org Subject: [PATCH 2/2] x86/ioapic: Split IOAPIC hot-removal into two steps Date: Mon, 27 Feb 2017 22:15:44 +0800 Message-Id: <1488204944-27189-3-git-send-email-rui.y.wang@intel.com> X-Mailer: git-send-email 1.7.5.4 In-Reply-To: <1488204944-27189-1-git-send-email-rui.y.wang@intel.com> References: <1488204944-27189-1-git-send-email-rui.y.wang@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The hot-removal of IOAPIC is broken into two parts: the PCI part and the ACPI part. The PCI part releases PCI resources before the PCI bus is gone, and the ACPI part is moved to a stage later than the hot-removal of the PCI root bus, so that the IOAPIC driver is able to hook the pcibios_release_device() of every PCI device under the same parent root bus, before the IOAPIC is hot-removed. This makes it possible for the IOAPIC to free any IRQ resource previously unable to get freed. Signed-off-by: Rui Wang --- drivers/acpi/internal.h | 1 + drivers/acpi/ioapic.c | 22 ++++++++++++++++------ drivers/acpi/pci_root.c | 4 ++-- 3 files changed, 19 insertions(+), 8 deletions(-) diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h index 219b90b..b2e3416 100644 --- a/drivers/acpi/internal.h +++ b/drivers/acpi/internal.h @@ -41,6 +41,7 @@ static inline void acpi_amba_init(void) {} void acpi_container_init(void); void acpi_memory_hotplug_init(void); #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC +void pci_ioapic_remove(struct acpi_pci_root *root); int acpi_ioapic_remove(struct acpi_pci_root *root); #else static inline int acpi_ioapic_remove(struct acpi_pci_root *root) { return 0; } diff --git a/drivers/acpi/ioapic.c b/drivers/acpi/ioapic.c index 6d7ce6e..1120dfd6 100644 --- a/drivers/acpi/ioapic.c +++ b/drivers/acpi/ioapic.c @@ -206,24 +206,34 @@ int acpi_ioapic_add(acpi_handle root_handle) return ACPI_SUCCESS(status) && ACPI_SUCCESS(retval) ? 0 : -ENODEV; } -int acpi_ioapic_remove(struct acpi_pci_root *root) +void pci_ioapic_remove(struct acpi_pci_root *root) { - int retval = 0; struct acpi_pci_ioapic *ioapic, *tmp; mutex_lock(&ioapic_list_lock); list_for_each_entry_safe(ioapic, tmp, &ioapic_list, list) { if (root->device->handle != ioapic->root_handle) continue; - - if (acpi_unregister_ioapic(ioapic->handle, ioapic->gsi_base)) - retval = -EBUSY; - if (ioapic->pdev) { pci_release_region(ioapic->pdev, 0); pci_disable_device(ioapic->pdev); pci_dev_put(ioapic->pdev); } + } + mutex_unlock(&ioapic_list_lock); +} + +int acpi_ioapic_remove(struct acpi_pci_root *root) +{ + int retval = 0; + struct acpi_pci_ioapic *ioapic, *tmp; + + mutex_lock(&ioapic_list_lock); + list_for_each_entry_safe(ioapic, tmp, &ioapic_list, list) { + if (root->device->handle != ioapic->root_handle) + continue; + if (acpi_unregister_ioapic(ioapic->handle, ioapic->gsi_base)) + retval = -EBUSY; if (ioapic->res.flags && ioapic->res.parent) release_resource(&ioapic->res); list_del(&ioapic->list); diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index bf601d4..919be0a 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -648,12 +648,12 @@ static void acpi_pci_root_remove(struct acpi_device *device) pci_stop_root_bus(root->bus); - WARN_ON(acpi_ioapic_remove(root)); - + pci_ioapic_remove(root); device_set_run_wake(root->bus->bridge, false); pci_acpi_remove_bus_pm_notifier(device); pci_remove_root_bus(root->bus); + WARN_ON(acpi_ioapic_remove(root)); dmar_device_remove(device->handle); -- 1.8.3.1