From patchwork Wed Oct 24 06:05:50 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tang Chen X-Patchwork-Id: 193688 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 492512C00A6 for ; Wed, 24 Oct 2012 17:07:49 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757833Ab2JXGHN (ORCPT ); Wed, 24 Oct 2012 02:07:13 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:27354 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1757644Ab2JXGHK (ORCPT ); Wed, 24 Oct 2012 02:07:10 -0400 X-IronPort-AV: E=Sophos;i="4.80,639,1344182400"; d="scan'208";a="6057055" Received: from unknown (HELO tang.cn.fujitsu.com) ([10.167.250.3]) by song.cn.fujitsu.com with ESMTP; 24 Oct 2012 14:05:32 +0800 Received: from fnstmail02.fnst.cn.fujitsu.com (tang.cn.fujitsu.com [127.0.0.1]) by tang.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id q9O6712r020892; Wed, 24 Oct 2012 14:07:02 +0800 Received: from tangchen.fnst.cn.fujitsu.com ([10.167.225.117]) by fnstmail02.fnst.cn.fujitsu.com (Lotus Domino Release 8.5.3) with ESMTP id 2012102414063085-714516 ; Wed, 24 Oct 2012 14:06:30 +0800 From: Tang Chen To: yinghai@kernel.org, bhelgaas@google.com, lenb@kernel.org, jiang.liu@huawei.com, izumi.taku@jp.fujitsu.com, isimatu.yasuaki@jp.fujitsu.com, mihailm@parallels.com, linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/2] Improve container_notify_cb() to support container hot-remove. Date: Wed, 24 Oct 2012 14:05:50 +0800 Message-Id: <1351058750-4275-3-git-send-email-tangchen@cn.fujitsu.com> X-Mailer: git-send-email 1.7.10.1 In-Reply-To: <1351058750-4275-1-git-send-email-tangchen@cn.fujitsu.com> References: <1351058750-4275-1-git-send-email-tangchen@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/10/24 14:06:30, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/10/24 14:06:32, Serialize complete at 2012/10/24 14:06:32 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org This patch introduces a new function container_device_remove() to do the container hot-remove job. It works like the following: 1. call acpi_bus_trim(device, 0) to stop the container device. 2. generate the KOBJ_OFFLINE uevent. (Did I do this correct ?) 3. call acpi_bus_hot_remove_device(), which will call acpi_bus_trim(device, 1) to remove the container. This patch is based on Lu Yinghai's work. git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git for-pci-split-pci-root-hp-2 Signed-off-by: Tang Chen --- drivers/acpi/container.c | 58 ++++++++++++++++++++++++++++++++++++++------- 1 files changed, 49 insertions(+), 9 deletions(-) diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c index d300e03..9676578 100644 --- a/drivers/acpi/container.c +++ b/drivers/acpi/container.c @@ -166,6 +166,35 @@ static int container_device_add(struct acpi_device **device, acpi_handle handle) return result; } +static int container_device_remove(struct acpi_device *device) +{ + int ret; + struct acpi_eject_event *ej_event; + + /* stop container device at first */ + ret = acpi_bus_trim(device, 0); + printk(KERN_WARNING "acpi_bus_trim stop return %x\n", ret); + if (ret) + return ret; + + /* event originated from ACPI eject notification */ + device->flags.eject_pending = 1; + + /* send the uevent before remove the device */ + kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); + + ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL); + if (!ej_event) + return -ENOMEM; + + ej_event->device = device; + ej_event->event = ACPI_NOTIFY_EJECT_REQUEST; + + acpi_bus_hot_remove_device(ej_event); + + return 0; +} + static void __container_notify_cb(struct work_struct *work) { struct acpi_device *device = NULL; @@ -181,6 +210,9 @@ static void __container_notify_cb(struct work_struct *work) handle = hp_work->handle; type = hp_work->type; + present = is_device_present(handle); + status = acpi_bus_get_device(handle, &device); + switch (type) { case ACPI_NOTIFY_BUS_CHECK: /* Fall through */ @@ -189,13 +221,14 @@ static void __container_notify_cb(struct work_struct *work) (type == ACPI_NOTIFY_BUS_CHECK) ? "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"); - present = is_device_present(handle); - status = acpi_bus_get_device(handle, &device); if (!present) { if (ACPI_SUCCESS(status)) { /* device exist and this is a remove request */ - device->flags.eject_pending = 1; - kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); + result = container_device_remove(device); + if (result) { + printk(KERN_WARNING "Failed to remove container\n"); + break; + } return; } break; @@ -215,12 +248,19 @@ static void __container_notify_cb(struct work_struct *work) break; case ACPI_NOTIFY_EJECT_REQUEST: - if (!acpi_bus_get_device(handle, &device) && device) { - device->flags.eject_pending = 1; - kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); - return; + printk(KERN_WARNING "Container driver received %s event\n", + "ACPI_NOTIFY_EJECT_REQUEST"); + + if (!present || ACPI_FAILURE(status) || !device) + break; + + result = container_device_remove(device); + if (result) { + printk(KERN_WARNING "Failed to remove container\n"); + break; } - break; + + return; default: /* non-hotplug event; possibly handled by other handler */