From patchwork Mon Jul 9 10:26:02 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yasuaki Ishimatsu X-Patchwork-Id: 1172051 Return-Path: X-Original-To: patchwork-linux-acpi@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id CDC2A40B21 for ; Mon, 9 Jul 2012 10:26:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752721Ab2GIK0U (ORCPT ); Mon, 9 Jul 2012 06:26:20 -0400 Received: from fgwmail5.fujitsu.co.jp ([192.51.44.35]:44476 "EHLO fgwmail5.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751857Ab2GIK0T (ORCPT ); Mon, 9 Jul 2012 06:26:19 -0400 Received: from m1.gw.fujitsu.co.jp (unknown [10.0.50.71]) by fgwmail5.fujitsu.co.jp (Postfix) with ESMTP id A730A3EE0C7; Mon, 9 Jul 2012 19:26:18 +0900 (JST) Received: from smail (m1 [127.0.0.1]) by outgoing.m1.gw.fujitsu.co.jp (Postfix) with ESMTP id 7220C45DE59; Mon, 9 Jul 2012 19:26:18 +0900 (JST) Received: from s1.gw.fujitsu.co.jp (s1.gw.fujitsu.co.jp [10.0.50.91]) by m1.gw.fujitsu.co.jp (Postfix) with ESMTP id 5B58445DE54; Mon, 9 Jul 2012 19:26:18 +0900 (JST) Received: from s1.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s1.gw.fujitsu.co.jp (Postfix) with ESMTP id 4FEAC1DB8052; Mon, 9 Jul 2012 19:26:18 +0900 (JST) Received: from g01jpexchyt01.g01.fujitsu.local (g01jpexchyt01.g01.fujitsu.local [10.128.194.40]) by s1.gw.fujitsu.co.jp (Postfix) with ESMTP id 001291DB8043; Mon, 9 Jul 2012 19:26:18 +0900 (JST) Received: from [127.0.0.1] (10.124.101.33) by g01jpexchyt01.g01.fujitsu.local (10.128.194.40) with Microsoft SMTP Server id 14.2.309.2; Mon, 9 Jul 2012 19:26:14 +0900 X-SecurityPolicyCheck: OK by SHieldMailChecker v1.7.4 Message-ID: <4FFAB1BA.9040801@jp.fujitsu.com> Date: Mon, 9 Jul 2012 19:26:02 +0900 From: Yasuaki Ishimatsu User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:13.0) Gecko/20120614 Thunderbird/13.0.1 MIME-Version: 1.0 To: , , , CC: , , , , , , , , , Subject: [RFC PATCH v3 4/13] memory-hotplug : remove /sys/firmware/memmap/X sysfs References: <4FFAB0A2.8070304@jp.fujitsu.com> In-Reply-To: <4FFAB0A2.8070304@jp.fujitsu.com> Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org When (hot)adding memory into system, /sys/firmware/memmap/X/{end, start, type} sysfs files are created. But there is no code to remove these files. The patch implements the function to remove them. Note : The code does not free firmware_map_entry since there is no way to free memory which is allocated by bootmem. CC: David Rientjes CC: Jiang Liu CC: Len Brown CC: Benjamin Herrenschmidt CC: Paul Mackerras CC: Christoph Lameter Cc: Minchan Kim CC: Andrew Morton CC: KOSAKI Motohiro CC: Wen Congyang Signed-off-by: Yasuaki Ishimatsu --- drivers/firmware/memmap.c | 78 ++++++++++++++++++++++++++++++++++++++++++- include/linux/firmware-map.h | 6 +++ mm/memory_hotplug.c | 6 ++- 3 files changed, 88 insertions(+), 2 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Index: linux-3.5-rc6/mm/memory_hotplug.c =================================================================== --- linux-3.5-rc6.orig/mm/memory_hotplug.c 2012-07-09 18:23:13.323844923 +0900 +++ linux-3.5-rc6/mm/memory_hotplug.c 2012-07-09 18:23:19.522767424 +0900 @@ -661,7 +661,11 @@ EXPORT_SYMBOL_GPL(add_memory); int remove_memory(int nid, u64 start, u64 size) { - return -EBUSY; + lock_memory_hotplug(); + /* remove memmap entry */ + firmware_map_remove(start, start + size - 1, "System RAM"); + unlock_memory_hotplug(); + return 0; } EXPORT_SYMBOL_GPL(remove_memory); Index: linux-3.5-rc6/include/linux/firmware-map.h =================================================================== --- linux-3.5-rc6.orig/include/linux/firmware-map.h 2012-07-09 18:23:09.532892314 +0900 +++ linux-3.5-rc6/include/linux/firmware-map.h 2012-07-09 18:23:19.523767412 +0900 @@ -25,6 +25,7 @@ int firmware_map_add_early(u64 start, u64 end, const char *type); int firmware_map_add_hotplug(u64 start, u64 end, const char *type); +int firmware_map_remove(u64 start, u64 end, const char *type); #else /* CONFIG_FIRMWARE_MEMMAP */ @@ -38,6 +39,11 @@ static inline int firmware_map_add_hotpl return 0; } +static inline int firmware_map_remove(u64 start, u64 end, const char *type) +{ + return 0; +} + #endif /* CONFIG_FIRMWARE_MEMMAP */ #endif /* _LINUX_FIRMWARE_MAP_H */ Index: linux-3.5-rc6/drivers/firmware/memmap.c =================================================================== --- linux-3.5-rc6.orig/drivers/firmware/memmap.c 2012-07-09 18:23:09.532892314 +0900 +++ linux-3.5-rc6/drivers/firmware/memmap.c 2012-07-09 18:25:46.371931554 +0900 @@ -21,6 +21,7 @@ #include #include #include +#include /* * Data types ------------------------------------------------------------------ @@ -79,7 +80,22 @@ static const struct sysfs_ops memmap_att .show = memmap_attr_show, }; +#define to_memmap_entry(obj) container_of(obj, struct firmware_map_entry, kobj) + +static void release_firmware_map_entry(struct kobject *kobj) +{ + struct firmware_map_entry *entry = to_memmap_entry(kobj); + struct page *head_page; + + head_page = virt_to_head_page(entry); + if (PageSlab(head_page)) + kfree(entry); + + /* There is no way to free memory allocated from bootmem*/ +} + static struct kobj_type memmap_ktype = { + .release = release_firmware_map_entry, .sysfs_ops = &memmap_attr_ops, .default_attrs = def_attrs, }; @@ -123,6 +139,16 @@ static int firmware_map_add_entry(u64 st return 0; } +/** + * firmware_map_remove_entry() - Does the real work to remove a firmware + * memmap entry. + * @entry: removed entry. + **/ +static inline void firmware_map_remove_entry(struct firmware_map_entry *entry) +{ + list_del(&entry->list); +} + /* * Add memmap entry on sysfs */ @@ -144,6 +170,31 @@ static int add_sysfs_fw_map_entry(struct return 0; } +/* + * Remove memmap entry on sysfs + */ +static inline void remove_sysfs_fw_map_entry(struct firmware_map_entry *entry) +{ + kobject_put(&entry->kobj); +} + +/* + * Search memmap entry + */ + +struct firmware_map_entry * __meminit +find_firmware_map_entry(u64 start, u64 end, const char *type) +{ + struct firmware_map_entry *entry; + + list_for_each_entry(entry, &map_entries, list) + if ((entry->start == start) && (entry->end == end) && + (!strcmp(entry->type, type))) + return entry; + + return NULL; +} + /** * firmware_map_add_hotplug() - Adds a firmware mapping entry when we do * memory hotplug. @@ -196,6 +247,32 @@ int __init firmware_map_add_early(u64 st return firmware_map_add_entry(start, end, type, entry); } +/** + * firmware_map_remove() - remove a firmware mapping entry + * @start: Start of the memory range. + * @end: End of the memory range (inclusive). + * @type: Type of the memory range. + * + * removes a firmware mapping entry. + * + * Returns 0 on success, or -EINVAL if no entry. + **/ +int __meminit firmware_map_remove(u64 start, u64 end, const char *type) +{ + struct firmware_map_entry *entry; + + entry = find_firmware_map_entry(start, end, type); + if (!entry) + return -EINVAL; + + /* remove the memmap entry */ + remove_sysfs_fw_map_entry(entry); + + firmware_map_remove_entry(entry); + + return 0; +} + /* * Sysfs functions ------------------------------------------------------------- */ @@ -218,7 +295,6 @@ static ssize_t type_show(struct firmware } #define to_memmap_attr(_attr) container_of(_attr, struct memmap_attribute, attr) -#define to_memmap_entry(obj) container_of(obj, struct firmware_map_entry, kobj) static ssize_t memmap_attr_show(struct kobject *kobj, struct attribute *attr, char *buf)