From patchwork Wed Jul 18 10:09:24 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yasuaki Ishimatsu X-Patchwork-Id: 171626 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from ozlabs.org (localhost [IPv6:::1]) by ozlabs.org (Postfix) with ESMTP id 58B232C0B76 for ; Wed, 18 Jul 2012 20:10:24 +1000 (EST) Received: from fgwmail6.fujitsu.co.jp (fgwmail6.fujitsu.co.jp [192.51.44.36]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 44AEC2C0391 for ; Wed, 18 Jul 2012 20:09:47 +1000 (EST) Received: from m1.gw.fujitsu.co.jp (unknown [10.0.50.71]) by fgwmail6.fujitsu.co.jp (Postfix) with ESMTP id 609323EE0BD for ; Wed, 18 Jul 2012 19:09:45 +0900 (JST) Received: from smail (m1 [127.0.0.1]) by outgoing.m1.gw.fujitsu.co.jp (Postfix) with ESMTP id 3FE4B45DE56 for ; Wed, 18 Jul 2012 19:09:45 +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 1225F45DE5A for ; Wed, 18 Jul 2012 19:09:45 +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 F01691DB8048 for ; Wed, 18 Jul 2012 19:09:44 +0900 (JST) Received: from g01jpexchyt03.g01.fujitsu.local (g01jpexchyt03.g01.fujitsu.local [10.128.194.42]) by s1.gw.fujitsu.co.jp (Postfix) with ESMTP id 9CAC21DB804E for ; Wed, 18 Jul 2012 19:09:44 +0900 (JST) Received: from [127.0.0.1] (10.124.101.33) by g01jpexchyt03.g01.fujitsu.local (10.128.194.42) with Microsoft SMTP Server id 14.2.309.2; Wed, 18 Jul 2012 19:09:41 +0900 X-SecurityPolicyCheck: OK by SHieldMailChecker v1.7.4 Message-ID: <50068B54.5070907@jp.fujitsu.com> Date: Wed, 18 Jul 2012 19:09:24 +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: , , , Subject: [RFC PATCH v4 4/13] memory-hotplug : remove /sys/firmware/memmap/X sysfs References: <50068974.1070409@jp.fujitsu.com> In-Reply-To: <50068974.1070409@jp.fujitsu.com> Cc: len.brown@intel.com, wency@cn.fujitsu.com, paulus@samba.org, minchan.kim@gmail.com, kosaki.motohiro@jp.fujitsu.com, rientjes@google.com, cl@linux.com, akpm@linux-foundation.org, liuj97@gmail.com X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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 | 9 +++- 3 files changed, 90 insertions(+), 3 deletions(-) Index: linux-3.5-rc6/mm/memory_hotplug.c =================================================================== --- linux-3.5-rc6.orig/mm/memory_hotplug.c 2012-07-18 17:20:05.670024283 +0900 +++ linux-3.5-rc6/mm/memory_hotplug.c 2012-07-18 17:51:03.933189930 +0900 @@ -1012,9 +1012,9 @@ int offline_memory(u64 start, u64 size) return offline_pages(start_pfn, end_pfn, 120 * HZ); } -int remove_memory(int nid, u64 start, u64 size) +int __ref remove_memory(int nid, u64 start, u64 size) { - int ret = -EBUSY; + int ret = 0; lock_memory_hotplug(); /* * The memory might become online by other task, even if you offine it. @@ -1025,8 +1025,13 @@ int remove_memory(int nid, u64 start, u6 "because the memmory range is online\n", start, start + size); ret = -EAGAIN; + goto out; } + /* remove memmap entry */ + firmware_map_remove(start, start + size, "System RAM"); + +out: unlock_memory_hotplug(); return ret; Index: linux-3.5-rc6/include/linux/firmware-map.h =================================================================== --- linux-3.5-rc6.orig/include/linux/firmware-map.h 2012-07-18 17:19:37.007382563 +0900 +++ linux-3.5-rc6/include/linux/firmware-map.h 2012-07-18 17:42:20.804730245 +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 2012-07-18 17:19:43.618300182 +0900 +++ linux-3.5-rc6/drivers/firmware/memmap.c 2012-07-18 17:42:20.846729721 +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 *page; + + page = virt_to_page(entry); + if (PageSlab(page) || PageCompound(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. + * @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 - 1, type); + if (!entry) + return -EINVAL; + + firmware_map_remove_entry(entry); + + /* remove the memmap entry */ + remove_sysfs_fw_map_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)