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Driver core: Introduce offline/online callbacks for memory blocks 

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 <rafael.j.wysocki@intel.com>
Tested-by: Vasilis Liaskovitis <vasilis.liaskovitis@profitbricks.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Toshi Kani <toshi.kani@hp.com>
This commit is contained in:
Rafael J. Wysocki 2013-05-08 14:18:37 +02:00
parent e2ff39400d
commit 4960e05e22
2 changed files with 88 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

112
drivers/base/memory.c
View File

@ -37,9 +37,14 @@ static inline int base_memory_block_id(int section_nr)
return section_nr / sections_per_block; 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 = { static struct bus_type memory_subsys = {
.name = MEMORY_CLASS_NAME, .name = MEMORY_CLASS_NAME,
.dev_name = MEMORY_CLASS_NAME, .dev_name = MEMORY_CLASS_NAME,
.online = memory_subsys_online,
.offline = memory_subsys_offline,
}; };
static BLOCKING_NOTIFIER_HEAD(memory_chain); static BLOCKING_NOTIFIER_HEAD(memory_chain);
@ -88,6 +93,7 @@ int register_memory(struct memory_block *memory)
memory->dev.bus = &memory_subsys; memory->dev.bus = &memory_subsys;
memory->dev.id = memory->start_section_nr / sections_per_block; memory->dev.id = memory->start_section_nr / sections_per_block;
memory->dev.release = memory_block_release; memory->dev.release = memory_block_release;
memory->dev.offline = memory->state == MEM_OFFLINE;
error = device_register(&memory->dev); error = device_register(&memory->dev);
return error; return error;
@ -278,33 +284,70 @@ static int __memory_block_change_state(struct memory_block *mem,
{ {
int ret = 0; int ret = 0;
if (mem->state != from_state_req) { if (mem->state != from_state_req)
ret = -EINVAL; return -EINVAL;
goto out;
}
if (to_state == MEM_OFFLINE) if (to_state == MEM_OFFLINE)
mem->state = MEM_GOING_OFFLINE; mem->state = MEM_GOING_OFFLINE;
ret = memory_block_action(mem->start_section_nr, to_state, online_type); ret = memory_block_action(mem->start_section_nr, to_state, online_type);
if (ret) { if (ret) {
mem->state = from_state_req; 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; static int memory_subsys_online(struct device *dev)
switch (mem->state) { {
case MEM_OFFLINE: struct memory_block *mem = container_of(dev, struct memory_block, dev);
kobject_uevent(&mem->dev.kobj, KOBJ_OFFLINE); int ret;
break;
case MEM_ONLINE: mutex_lock(&mem->state_mutex);
kobject_uevent(&mem->dev.kobj, KOBJ_ONLINE);
break; ret = mem->state == MEM_ONLINE ? 0 :
default: __memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE,
break; 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 = mem->state == MEM_OFFLINE ? 0 :
__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; return ret;
} }
@ -315,8 +358,8 @@ static int memory_block_change_state(struct memory_block *mem,
int ret; int ret;
mutex_lock(&mem->state_mutex); mutex_lock(&mem->state_mutex);
ret = __memory_block_change_state(mem, to_state, from_state_req, ret = __memory_block_change_state_uevent(mem, to_state, from_state_req,
online_type); online_type);
mutex_unlock(&mem->state_mutex); mutex_unlock(&mem->state_mutex);
return ret; return ret;
@ -326,22 +369,34 @@ store_mem_state(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count) struct device_attribute *attr, const char *buf, size_t count)
{ {
struct memory_block *mem; struct memory_block *mem;
bool offline;
int ret = -EINVAL; int ret = -EINVAL;
mem = container_of(dev, struct memory_block, dev); 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, ret = memory_block_change_state(mem, MEM_ONLINE,
MEM_OFFLINE, ONLINE_KERNEL); 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, ret = memory_block_change_state(mem, MEM_ONLINE,
MEM_OFFLINE, ONLINE_MOVABLE); 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, ret = memory_block_change_state(mem, MEM_ONLINE,
MEM_OFFLINE, ONLINE_KEEP); 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, ret = memory_block_change_state(mem, MEM_OFFLINE,
MEM_ONLINE, -1); MEM_ONLINE, -1);
}
if (!ret)
dev->offline = offline;
unlock_device_hotplug();
if (ret) if (ret)
return ret; return ret;
@ -563,6 +618,7 @@ static int init_memory_block(struct memory_block **memory,
base_memory_block_id(scn_nr) * sections_per_block; base_memory_block_id(scn_nr) * sections_per_block;
mem->end_section_nr = mem->start_section_nr + sections_per_block - 1; mem->end_section_nr = mem->start_section_nr + sections_per_block - 1;
mem->state = state; mem->state = state;
mem->last_online = ONLINE_KEEP;
mem->section_count++; mem->section_count++;
mutex_init(&mem->state_mutex); mutex_init(&mem->state_mutex);
start_pfn = section_nr_to_pfn(mem->start_section_nr); start_pfn = section_nr_to_pfn(mem->start_section_nr);
@ -681,14 +737,20 @@ int unregister_memory_section(struct mem_section *section)
/* /*
* offline one memory block. If the memory block has been offlined, do nothing. * offline one memory block. If the memory block has been offlined, do nothing.
*
* Call under device_hotplug_lock.
*/ */
int offline_memory_block(struct memory_block *mem) int offline_memory_block(struct memory_block *mem)
{ {
int ret = 0; int ret = 0;
mutex_lock(&mem->state_mutex); mutex_lock(&mem->state_mutex);
if (mem->state != MEM_OFFLINE) if (mem->state != MEM_OFFLINE) {
ret = __memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE, -1); ret = __memory_block_change_state_uevent(mem, MEM_OFFLINE,
MEM_ONLINE, -1);
if (!ret)
mem->dev.offline = true;
}
mutex_unlock(&mem->state_mutex); mutex_unlock(&mem->state_mutex);
return ret; return ret;

1
include/linux/memory.h
View File

@ -26,6 +26,7 @@ struct memory_block {
unsigned long start_section_nr; unsigned long start_section_nr;
unsigned long end_section_nr; unsigned long end_section_nr;
unsigned long state; unsigned long state;
int last_online;
int section_count; int section_count;
/* /*