From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Rafael J. Wysocki" Subject: [PATCH 2/2 v2, RFC] Driver core: Introduce offline/online callbacks for memory blocks Date: Sat, 04 May 2013 13:21:16 +0200 Message-ID: <19540491.PRsM4lKIYM@vostro.rjw.lan> References: <1576321.HU0tZ4cGWk@vostro.rjw.lan> <1583356.7oqZ7gBy2q@vostro.rjw.lan> <2376818.CRj1BTLk0Y@vostro.rjw.lan> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7Bit Return-path: In-Reply-To: <2376818.CRj1BTLk0Y@vostro.rjw.lan> Sender: owner-linux-mm@kvack.org To: Greg Kroah-Hartman Cc: Toshi Kani , ACPI Devel Maling List , LKML , isimatu.yasuaki@jp.fujitsu.com, vasilis.liaskovitis@profitbricks.com, Len Brown , linux-mm@kvack.org List-Id: linux-acpi@vger.kernel.org From: Rafael J. Wysocki Introduce .offline() and .online() callbacks for memory_subsys that will allow the generic device_offline() and device_online() to be used with device objects representing memory blocks. That, in turn, allows the ACPI subsystem to use device_offline() to put removable memory blocks offline, if possible, before removing memory modules holding them. The 'online' sysfs attribute of memory block devices will attempt to put them offline if 0 is written to it and will attempt to apply the previously used online type when onlining them (i.e. when 1 is written to it). Signed-off-by: Rafael J. Wysocki --- drivers/base/memory.c | 105 +++++++++++++++++++++++++++++++++++++------------ include/linux/memory.h | 1 2 files changed, 81 insertions(+), 25 deletions(-) Index: linux-pm/drivers/base/memory.c =================================================================== --- linux-pm.orig/drivers/base/memory.c +++ linux-pm/drivers/base/memory.c @@ -37,9 +37,14 @@ static inline int base_memory_block_id(i return section_nr / sections_per_block; } +static int memory_subsys_online(struct device *dev); +static int memory_subsys_offline(struct device *dev); + static struct bus_type memory_subsys = { .name = MEMORY_CLASS_NAME, .dev_name = MEMORY_CLASS_NAME, + .online = memory_subsys_online, + .offline = memory_subsys_offline, }; static BLOCKING_NOTIFIER_HEAD(memory_chain); @@ -278,33 +283,64 @@ static int __memory_block_change_state(s { int ret = 0; - if (mem->state != from_state_req) { - ret = -EINVAL; - goto out; - } + if (mem->state != from_state_req) + return -EINVAL; if (to_state == MEM_OFFLINE) mem->state = MEM_GOING_OFFLINE; ret = memory_block_action(mem->start_section_nr, to_state, online_type); - if (ret) { mem->state = from_state_req; - goto out; + } else { + mem->state = to_state; + if (to_state == MEM_ONLINE) + mem->last_online = online_type; } + return ret; +} - mem->state = to_state; - switch (mem->state) { - case MEM_OFFLINE: - kobject_uevent(&mem->dev.kobj, KOBJ_OFFLINE); - break; - case MEM_ONLINE: - kobject_uevent(&mem->dev.kobj, KOBJ_ONLINE); - break; - default: - break; +static int memory_subsys_online(struct device *dev) +{ + struct memory_block *mem = container_of(dev, struct memory_block, dev); + int ret; + + mutex_lock(&mem->state_mutex); + ret = __memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE, + mem->last_online); + mutex_unlock(&mem->state_mutex); + return ret; +} + +static int memory_subsys_offline(struct device *dev) +{ + struct memory_block *mem = container_of(dev, struct memory_block, dev); + int ret; + + mutex_lock(&mem->state_mutex); + ret = __memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE, -1); + mutex_unlock(&mem->state_mutex); + return ret; +} + +static int __memory_block_change_state_uevent(struct memory_block *mem, + unsigned long to_state, unsigned long from_state_req, + int online_type) +{ + int ret = __memory_block_change_state(mem, to_state, from_state_req, + online_type); + if (!ret) { + switch (mem->state) { + case MEM_OFFLINE: + kobject_uevent(&mem->dev.kobj, KOBJ_OFFLINE); + break; + case MEM_ONLINE: + kobject_uevent(&mem->dev.kobj, KOBJ_ONLINE); + break; + default: + break; + } } -out: return ret; } @@ -315,8 +351,8 @@ static int memory_block_change_state(str int ret; mutex_lock(&mem->state_mutex); - ret = __memory_block_change_state(mem, to_state, from_state_req, - online_type); + ret = __memory_block_change_state_uevent(mem, to_state, from_state_req, + online_type); mutex_unlock(&mem->state_mutex); return ret; @@ -326,22 +362,34 @@ store_mem_state(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct memory_block *mem; + bool offline; int ret = -EINVAL; mem = container_of(dev, struct memory_block, dev); - if (!strncmp(buf, "online_kernel", min_t(int, count, 13))) + lock_device_hotplug(); + + if (!strncmp(buf, "online_kernel", min_t(int, count, 13))) { + offline = false; ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE, ONLINE_KERNEL); - else if (!strncmp(buf, "online_movable", min_t(int, count, 14))) + } else if (!strncmp(buf, "online_movable", min_t(int, count, 14))) { + offline = false; ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE, ONLINE_MOVABLE); - else if (!strncmp(buf, "online", min_t(int, count, 6))) + } else if (!strncmp(buf, "online", min_t(int, count, 6))) { + offline = false; ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE, ONLINE_KEEP); - else if(!strncmp(buf, "offline", min_t(int, count, 7))) + } else if(!strncmp(buf, "offline", min_t(int, count, 7))) { + offline = true; ret = memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE, -1); + } + if (!ret) + dev->offline = offline; + + unlock_device_hotplug(); if (ret) return ret; @@ -563,6 +611,7 @@ static int init_memory_block(struct memo base_memory_block_id(scn_nr) * sections_per_block; mem->end_section_nr = mem->start_section_nr + sections_per_block - 1; mem->state = state; + mem->last_online = ONLINE_KEEP; mem->section_count++; mutex_init(&mem->state_mutex); start_pfn = section_nr_to_pfn(mem->start_section_nr); @@ -686,10 +735,16 @@ int offline_memory_block(struct memory_b { int ret = 0; + lock_device_hotplug(); mutex_lock(&mem->state_mutex); - if (mem->state != MEM_OFFLINE) - ret = __memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE, -1); + if (mem->state != MEM_OFFLINE) { + ret = __memory_block_change_state_uevent(mem, MEM_OFFLINE, + MEM_ONLINE, -1); + if (!ret) + mem->dev.offline = true; + } mutex_unlock(&mem->state_mutex); + unlock_device_hotplug(); return ret; } Index: linux-pm/include/linux/memory.h =================================================================== --- linux-pm.orig/include/linux/memory.h +++ linux-pm/include/linux/memory.h @@ -26,6 +26,7 @@ struct memory_block { unsigned long start_section_nr; unsigned long end_section_nr; unsigned long state; + int last_online; int section_count; /* -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759095Ab3EDLNR (ORCPT ); Sat, 4 May 2013 07:13:17 -0400 Received: from hydra.sisk.pl ([212.160.235.94]:58193 "EHLO hydra.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756356Ab3EDLNL (ORCPT ); Sat, 4 May 2013 07:13:11 -0400 From: "Rafael J. Wysocki" To: Greg Kroah-Hartman Cc: Toshi Kani , ACPI Devel Maling List , LKML , isimatu.yasuaki@jp.fujitsu.com, vasilis.liaskovitis@profitbricks.com, Len Brown , linux-mm@kvack.org Subject: [PATCH 2/2 v2, RFC] Driver core: Introduce offline/online callbacks for memory blocks Date: Sat, 04 May 2013 13:21:16 +0200 Message-ID: <19540491.PRsM4lKIYM@vostro.rjw.lan> User-Agent: KMail/4.9.5 (Linux/3.9.0+; KDE/4.9.5; x86_64; ; ) In-Reply-To: <2376818.CRj1BTLk0Y@vostro.rjw.lan> References: <1576321.HU0tZ4cGWk@vostro.rjw.lan> <1583356.7oqZ7gBy2q@vostro.rjw.lan> <2376818.CRj1BTLk0Y@vostro.rjw.lan> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="utf-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rafael J. Wysocki Introduce .offline() and .online() callbacks for memory_subsys that will allow the generic device_offline() and device_online() to be used with device objects representing memory blocks. That, in turn, allows the ACPI subsystem to use device_offline() to put removable memory blocks offline, if possible, before removing memory modules holding them. The 'online' sysfs attribute of memory block devices will attempt to put them offline if 0 is written to it and will attempt to apply the previously used online type when onlining them (i.e. when 1 is written to it). Signed-off-by: Rafael J. Wysocki --- drivers/base/memory.c | 105 +++++++++++++++++++++++++++++++++++++------------ include/linux/memory.h | 1 2 files changed, 81 insertions(+), 25 deletions(-) Index: linux-pm/drivers/base/memory.c =================================================================== --- linux-pm.orig/drivers/base/memory.c +++ linux-pm/drivers/base/memory.c @@ -37,9 +37,14 @@ static inline int base_memory_block_id(i return section_nr / sections_per_block; } +static int memory_subsys_online(struct device *dev); +static int memory_subsys_offline(struct device *dev); + static struct bus_type memory_subsys = { .name = MEMORY_CLASS_NAME, .dev_name = MEMORY_CLASS_NAME, + .online = memory_subsys_online, + .offline = memory_subsys_offline, }; static BLOCKING_NOTIFIER_HEAD(memory_chain); @@ -278,33 +283,64 @@ static int __memory_block_change_state(s { int ret = 0; - if (mem->state != from_state_req) { - ret = -EINVAL; - goto out; - } + if (mem->state != from_state_req) + return -EINVAL; if (to_state == MEM_OFFLINE) mem->state = MEM_GOING_OFFLINE; ret = memory_block_action(mem->start_section_nr, to_state, online_type); - if (ret) { mem->state = from_state_req; - goto out; + } else { + mem->state = to_state; + if (to_state == MEM_ONLINE) + mem->last_online = online_type; } + return ret; +} - mem->state = to_state; - switch (mem->state) { - case MEM_OFFLINE: - kobject_uevent(&mem->dev.kobj, KOBJ_OFFLINE); - break; - case MEM_ONLINE: - kobject_uevent(&mem->dev.kobj, KOBJ_ONLINE); - break; - default: - break; +static int memory_subsys_online(struct device *dev) +{ + struct memory_block *mem = container_of(dev, struct memory_block, dev); + int ret; + + mutex_lock(&mem->state_mutex); + ret = __memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE, + mem->last_online); + mutex_unlock(&mem->state_mutex); + return ret; +} + +static int memory_subsys_offline(struct device *dev) +{ + struct memory_block *mem = container_of(dev, struct memory_block, dev); + int ret; + + mutex_lock(&mem->state_mutex); + ret = __memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE, -1); + mutex_unlock(&mem->state_mutex); + return ret; +} + +static int __memory_block_change_state_uevent(struct memory_block *mem, + unsigned long to_state, unsigned long from_state_req, + int online_type) +{ + int ret = __memory_block_change_state(mem, to_state, from_state_req, + online_type); + if (!ret) { + switch (mem->state) { + case MEM_OFFLINE: + kobject_uevent(&mem->dev.kobj, KOBJ_OFFLINE); + break; + case MEM_ONLINE: + kobject_uevent(&mem->dev.kobj, KOBJ_ONLINE); + break; + default: + break; + } } -out: return ret; } @@ -315,8 +351,8 @@ static int memory_block_change_state(str int ret; mutex_lock(&mem->state_mutex); - ret = __memory_block_change_state(mem, to_state, from_state_req, - online_type); + ret = __memory_block_change_state_uevent(mem, to_state, from_state_req, + online_type); mutex_unlock(&mem->state_mutex); return ret; @@ -326,22 +362,34 @@ store_mem_state(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct memory_block *mem; + bool offline; int ret = -EINVAL; mem = container_of(dev, struct memory_block, dev); - if (!strncmp(buf, "online_kernel", min_t(int, count, 13))) + lock_device_hotplug(); + + if (!strncmp(buf, "online_kernel", min_t(int, count, 13))) { + offline = false; ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE, ONLINE_KERNEL); - else if (!strncmp(buf, "online_movable", min_t(int, count, 14))) + } else if (!strncmp(buf, "online_movable", min_t(int, count, 14))) { + offline = false; ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE, ONLINE_MOVABLE); - else if (!strncmp(buf, "online", min_t(int, count, 6))) + } else if (!strncmp(buf, "online", min_t(int, count, 6))) { + offline = false; ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE, ONLINE_KEEP); - else if(!strncmp(buf, "offline", min_t(int, count, 7))) + } else if(!strncmp(buf, "offline", min_t(int, count, 7))) { + offline = true; ret = memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE, -1); + } + if (!ret) + dev->offline = offline; + + unlock_device_hotplug(); if (ret) return ret; @@ -563,6 +611,7 @@ static int init_memory_block(struct memo base_memory_block_id(scn_nr) * sections_per_block; mem->end_section_nr = mem->start_section_nr + sections_per_block - 1; mem->state = state; + mem->last_online = ONLINE_KEEP; mem->section_count++; mutex_init(&mem->state_mutex); start_pfn = section_nr_to_pfn(mem->start_section_nr); @@ -686,10 +735,16 @@ int offline_memory_block(struct memory_b { int ret = 0; + lock_device_hotplug(); mutex_lock(&mem->state_mutex); - if (mem->state != MEM_OFFLINE) - ret = __memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE, -1); + if (mem->state != MEM_OFFLINE) { + ret = __memory_block_change_state_uevent(mem, MEM_OFFLINE, + MEM_ONLINE, -1); + if (!ret) + mem->dev.offline = true; + } mutex_unlock(&mem->state_mutex); + unlock_device_hotplug(); return ret; } Index: linux-pm/include/linux/memory.h =================================================================== --- linux-pm.orig/include/linux/memory.h +++ linux-pm/include/linux/memory.h @@ -26,6 +26,7 @@ struct memory_block { unsigned long start_section_nr; unsigned long end_section_nr; unsigned long state; + int last_online; int section_count; /*