Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753901Ab2JCJ7H (ORCPT ); Wed, 3 Oct 2012 05:59:07 -0400 Received: from fgwmail6.fujitsu.co.jp ([192.51.44.36]:40797 "EHLO fgwmail6.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752461Ab2JCJ7F (ORCPT ); Wed, 3 Oct 2012 05:59:05 -0400 X-SecurityPolicyCheck: OK by SHieldMailChecker v1.7.4 Message-ID: <506C0C53.60205@jp.fujitsu.com> Date: Wed, 3 Oct 2012 18:58:43 +0900 From: Yasuaki Ishimatsu User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:15.0) Gecko/20120907 Thunderbird/15.0.1 MIME-Version: 1.0 To: , , , CC: , , , , , , , Subject: [PATCH 1/4] acpi,memory-hotplug : add memory offline code to acpi_memory_device_remove() References: <506C0AE8.40702@jp.fujitsu.com> In-Reply-To: <506C0AE8.40702@jp.fujitsu.com> Content-Type: text/plain; charset="ISO-2022-JP" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3827 Lines: 119 From: Yasuaki Ishimatsu The memory device can be removed by 2 ways: 1. send eject request by SCI 2. echo 1 >/sys/bus/pci/devices/PNP0C80:XX/eject In the 1st case, acpi_memory_disable_device() will be called. In the 2nd case, acpi_memory_device_remove() will be called. acpi_memory_device_remove() will also be called when we unbind the memory device from the driver acpi_memhotplug. acpi_memory_disable_device() has already implemented a code which offlines memory and releases acpi_memory_info struct . But acpi_memory_device_remove() has not implemented it yet. So the patch implements acpi_memory_remove_memory() for offlining memory and releasing acpi_memory_info struct. And it is used by both acpi_memory_device_remove() and acpi_memory_disable_device(). Additionally, if the type is ACPI_BUS_REMOVAL_EJECT in acpi_memory_device_remove() , it means that the user wants to eject the memory device. In this case, acpi_memory_device_remove() calls acpi_memory_remove_memory(). CC: David Rientjes CC: Jiang Liu CC: Len Brown CC: Christoph Lameter Cc: Minchan Kim CC: Andrew Morton CC: KOSAKI Motohiro Signed-off-by: Yasuaki Ishimatsu Signed-off-by: Wen Congyang --- drivers/acpi/acpi_memhotplug.c | 44 +++++++++++++++++++++++++++++++---------- 1 file changed, 34 insertions(+), 10 deletions(-) Index: linux-3.6/drivers/acpi/acpi_memhotplug.c =================================================================== --- linux-3.6.orig/drivers/acpi/acpi_memhotplug.c 2012-10-03 18:55:33.386378909 +0900 +++ linux-3.6/drivers/acpi/acpi_memhotplug.c 2012-10-03 18:55:58.624380688 +0900 @@ -306,24 +306,37 @@ static int acpi_memory_powerdown_device( return 0; } -static int acpi_memory_disable_device(struct acpi_memory_device *mem_device) +static int acpi_memory_remove_memory(struct acpi_memory_device *mem_device) { int result; struct acpi_memory_info *info, *n; + list_for_each_entry_safe(info, n, &mem_device->res_list, list) { + if (!info->enabled) + return -EBUSY; + + result = remove_memory(info->start_addr, info->length); + if (result) + return result; + + list_del(&info->list); + kfree(info); + } + + return 0; +} + +static int acpi_memory_disable_device(struct acpi_memory_device *mem_device) +{ + int result; /* * Ask the VM to offline this memory range. * Note: Assume that this function returns zero on success */ - list_for_each_entry_safe(info, n, &mem_device->res_list, list) { - if (info->enabled) { - result = remove_memory(info->start_addr, info->length); - if (result) - return result; - } - kfree(info); - } + result = acpi_memory_remove_memory(mem_device); + if (result) + return result; /* Power-off and eject the device */ result = acpi_memory_powerdown_device(mem_device); @@ -473,12 +486,23 @@ static int acpi_memory_device_add(struct static int acpi_memory_device_remove(struct acpi_device *device, int type) { struct acpi_memory_device *mem_device = NULL; - + int result; if (!device || !acpi_driver_data(device)) return -EINVAL; mem_device = acpi_driver_data(device); + + if (type == ACPI_BUS_REMOVAL_EJECT) { + /* + * offline and remove memory only when the memory device is + * ejected. + */ + result = acpi_memory_remove_memory(mem_device); + if (result) + return result; + } + kfree(mem_device); return 0; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/