[net-next-2.6.git] / drivers / base / memory.c

/*
 * drivers/base/memory.c - basic Memory class support
 *
 * Written by Matt Tolentino <matthew.e.tolentino@intel.com>
 *            Dave Hansen <haveblue@us.ibm.com>
 *
 * This file provides the necessary infrastructure to represent
 * a SPARSEMEM-memory-model system's physical memory in /sysfs.
 * All arch-independent code that assumes MEMORY_HOTPLUG requires
 * SPARSEMEM should be contained here, or in mm/memory_hotplug.c.
 */

#include <linux/sysdev.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/topology.h>
#include <linux/capability.h>
#include <linux/device.h>
#include <linux/memory.h>
#include <linux/kobject.h>
#include <linux/memory_hotplug.h>
#include <linux/mm.h>
#include <linux/mutex.h>
#include <linux/stat.h>

#include <asm/atomic.h>
#include <asm/uaccess.h>

#define MEMORY_CLASS_NAME	"memory"

static struct sysdev_class memory_sysdev_class = {
	.name = MEMORY_CLASS_NAME,
};

static const char *memory_uevent_name(struct kset *kset, struct kobject *kobj)
{
	return MEMORY_CLASS_NAME;
}

static int memory_uevent(struct kset *kset, struct kobject *obj, struct kobj_uevent_env *env)
{
	int retval = 0;

	return retval;
}

static struct kset_uevent_ops memory_uevent_ops = {
	.name		= memory_uevent_name,
	.uevent		= memory_uevent,
};

static BLOCKING_NOTIFIER_HEAD(memory_chain);

int register_memory_notifier(struct notifier_block *nb)
{
        return blocking_notifier_chain_register(&memory_chain, nb);
}
EXPORT_SYMBOL(register_memory_notifier);

void unregister_memory_notifier(struct notifier_block *nb)
{
        blocking_notifier_chain_unregister(&memory_chain, nb);
}
EXPORT_SYMBOL(unregister_memory_notifier);

/*
 * register_memory - Setup a sysfs device for a memory block
 */
static
int register_memory(struct memory_block *memory, struct mem_section *section)
{
	int error;

	memory->sysdev.cls = &memory_sysdev_class;
	memory->sysdev.id = __section_nr(section);

	error = sysdev_register(&memory->sysdev);
	return error;
}

static void
unregister_memory(struct memory_block *memory, struct mem_section *section)
{
	BUG_ON(memory->sysdev.cls != &memory_sysdev_class);
	BUG_ON(memory->sysdev.id != __section_nr(section));

	/* drop the ref. we got in remove_memory_block() */
	kobject_put(&memory->sysdev.kobj);
	sysdev_unregister(&memory->sysdev);
}

/*
 * use this as the physical section index that this memsection
 * uses.
 */

static ssize_t show_mem_phys_index(struct sys_device *dev,
			struct sysdev_attribute *attr, char *buf)
{
	struct memory_block *mem =
		container_of(dev, struct memory_block, sysdev);
	return sprintf(buf, "%08lx\n", mem->phys_index);
}

/*
 * Show whether the section of memory is likely to be hot-removable
 */
static ssize_t show_mem_removable(struct sys_device *dev,
			struct sysdev_attribute *attr, char *buf)
{
	unsigned long start_pfn;
	int ret;
	struct memory_block *mem =
		container_of(dev, struct memory_block, sysdev);

	start_pfn = section_nr_to_pfn(mem->phys_index);
	ret = is_mem_section_removable(start_pfn, PAGES_PER_SECTION);
	return sprintf(buf, "%d\n", ret);
}

/*
 * online, offline, going offline, etc.
 */
static ssize_t show_mem_state(struct sys_device *dev,
			struct sysdev_attribute *attr, char *buf)
{
	struct memory_block *mem =
		container_of(dev, struct memory_block, sysdev);
	ssize_t len = 0;

	/*
	 * We can probably put these states in a nice little array
	 * so that they're not open-coded
	 */
	switch (mem->state) {
		case MEM_ONLINE:
			len = sprintf(buf, "online\n");
			break;
		case MEM_OFFLINE:
			len = sprintf(buf, "offline\n");
			break;
		case MEM_GOING_OFFLINE:
			len = sprintf(buf, "going-offline\n");
			break;
		default:
			len = sprintf(buf, "ERROR-UNKNOWN-%ld\n",
					mem->state);
			WARN_ON(1);
			break;
	}

	return len;
}

int memory_notify(unsigned long val, void *v)
{
	return blocking_notifier_call_chain(&memory_chain, val, v);
}

/*
 * MEMORY_HOTPLUG depends on SPARSEMEM in mm/Kconfig, so it is
 * OK to have direct references to sparsemem variables in here.
 */
static int
memory_block_action(struct memory_block *mem, unsigned long action)
{
	int i;
	unsigned long psection;
	unsigned long start_pfn, start_paddr;
	struct page *first_page;
	int ret;
	int old_state = mem->state;

	psection = mem->phys_index;
	first_page = pfn_to_page(psection << PFN_SECTION_SHIFT);

	/*
	 * The probe routines leave the pages reserved, just
	 * as the bootmem code does.  Make sure they're still
	 * that way.
	 */
	if (action == MEM_ONLINE) {
		for (i = 0; i < PAGES_PER_SECTION; i++) {
			if (PageReserved(first_page+i))
				continue;

			printk(KERN_WARNING "section number %ld page number %d "
				"not reserved, was it already online? \n",
				psection, i);
			return -EBUSY;
		}
	}

	switch (action) {
		case MEM_ONLINE:
			start_pfn = page_to_pfn(first_page);
			ret = online_pages(start_pfn, PAGES_PER_SECTION);
			break;
		case MEM_OFFLINE:
			mem->state = MEM_GOING_OFFLINE;
			start_paddr = page_to_pfn(first_page) << PAGE_SHIFT;
			ret = remove_memory(start_paddr,
					    PAGES_PER_SECTION << PAGE_SHIFT);
			if (ret) {
				mem->state = old_state;
				break;
			}
			break;
		default:
			WARN(1, KERN_WARNING "%s(%p, %ld) unknown action: %ld\n",
					__func__, mem, action, action);
			ret = -EINVAL;
	}

	return ret;
}

static int memory_block_change_state(struct memory_block *mem,
		unsigned long to_state, unsigned long from_state_req)
{
	int ret = 0;
	mutex_lock(&mem->state_mutex);

	if (mem->state != from_state_req) {
		ret = -EINVAL;
		goto out;
	}

	ret = memory_block_action(mem, to_state);
	if (!ret)
		mem->state = to_state;

out:
	mutex_unlock(&mem->state_mutex);
	return ret;
}

static ssize_t
store_mem_state(struct sys_device *dev,
		struct sysdev_attribute *attr, const char *buf, size_t count)
{
	struct memory_block *mem;
	unsigned int phys_section_nr;
	int ret = -EINVAL;

	mem = container_of(dev, struct memory_block, sysdev);
	phys_section_nr = mem->phys_index;

	if (!present_section_nr(phys_section_nr))
		goto out;

	if (!strncmp(buf, "online", min((int)count, 6)))
		ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE);
	else if(!strncmp(buf, "offline", min((int)count, 7)))
		ret = memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE);
out:
	if (ret)
		return ret;
	return count;
}

/*
 * phys_device is a bad name for this.  What I really want
 * is a way to differentiate between memory ranges that
 * are part of physical devices that constitute
 * a complete removable unit or fru.
 * i.e. do these ranges belong to the same physical device,
 * s.t. if I offline all of these sections I can then
 * remove the physical device?
 */
static ssize_t show_phys_device(struct sys_device *dev,
				struct sysdev_attribute *attr, char *buf)
{
	struct memory_block *mem =
		container_of(dev, struct memory_block, sysdev);
	return sprintf(buf, "%d\n", mem->phys_device);
}

static SYSDEV_ATTR(phys_index, 0444, show_mem_phys_index, NULL);
static SYSDEV_ATTR(state, 0644, show_mem_state, store_mem_state);
static SYSDEV_ATTR(phys_device, 0444, show_phys_device, NULL);
static SYSDEV_ATTR(removable, 0444, show_mem_removable, NULL);

#define mem_create_simple_file(mem, attr_name)	\
	sysdev_create_file(&mem->sysdev, &attr_##attr_name)
#define mem_remove_simple_file(mem, attr_name)	\
	sysdev_remove_file(&mem->sysdev, &attr_##attr_name)

/*
 * Block size attribute stuff
 */
static ssize_t
print_block_size(struct class *class, char *buf)
{
	return sprintf(buf, "%lx\n", (unsigned long)PAGES_PER_SECTION * PAGE_SIZE);
}

static CLASS_ATTR(block_size_bytes, 0444, print_block_size, NULL);

static int block_size_init(void)
{
	return sysfs_create_file(&memory_sysdev_class.kset.kobj,
				&class_attr_block_size_bytes.attr);
}

/*
 * Some architectures will have custom drivers to do this, and
 * will not need to do it from userspace.  The fake hot-add code
 * as well as ppc64 will do all of their discovery in userspace
 * and will require this interface.
 */
#ifdef CONFIG_ARCH_MEMORY_PROBE
static ssize_t
memory_probe_store(struct class *class, const char *buf, size_t count)
{
	u64 phys_addr;
	int nid;
	int ret;

	phys_addr = simple_strtoull(buf, NULL, 0);

	nid = memory_add_physaddr_to_nid(phys_addr);
	ret = add_memory(nid, phys_addr, PAGES_PER_SECTION << PAGE_SHIFT);

	if (ret)
		count = ret;

	return count;
}
static CLASS_ATTR(probe, S_IWUSR, NULL, memory_probe_store);

static int memory_probe_init(void)
{
	return sysfs_create_file(&memory_sysdev_class.kset.kobj,
				&class_attr_probe.attr);
}
#else
static inline int memory_probe_init(void)
{
	return 0;
}
#endif

/*
 * Note that phys_device is optional.  It is here to allow for
 * differentiation between which *physical* devices each
 * section belongs to...
 */

static int add_memory_block(int nid, struct mem_section *section,
			unsigned long state, int phys_device,
			enum mem_add_context context)
{
	struct memory_block *mem = kzalloc(sizeof(*mem), GFP_KERNEL);
	int ret = 0;

	if (!mem)
		return -ENOMEM;

	mem->phys_index = __section_nr(section);
	mem->state = state;
	mutex_init(&mem->state_mutex);
	mem->phys_device = phys_device;

	ret = register_memory(mem, section);
	if (!ret)
		ret = mem_create_simple_file(mem, phys_index);
	if (!ret)
		ret = mem_create_simple_file(mem, state);
	if (!ret)
		ret = mem_create_simple_file(mem, phys_device);
	if (!ret)
		ret = mem_create_simple_file(mem, removable);
	if (!ret) {
		if (context == HOTPLUG)
			ret = register_mem_sect_under_node(mem, nid);
	}

	return ret;
}

/*
 * For now, we have a linear search to go find the appropriate
 * memory_block corresponding to a particular phys_index. If
 * this gets to be a real problem, we can always use a radix
 * tree or something here.
 *
 * This could be made generic for all sysdev classes.
 */
struct memory_block *find_memory_block(struct mem_section *section)
{
	struct kobject *kobj;
	struct sys_device *sysdev;
	struct memory_block *mem;
	char name[sizeof(MEMORY_CLASS_NAME) + 9 + 1];

	/*
	 * This only works because we know that section == sysdev->id
	 * slightly redundant with sysdev_register()
	 */
	sprintf(&name[0], "%s%d", MEMORY_CLASS_NAME, __section_nr(section));

	kobj = kset_find_obj(&memory_sysdev_class.kset, name);
	if (!kobj)
		return NULL;

	sysdev = container_of(kobj, struct sys_device, kobj);
	mem = container_of(sysdev, struct memory_block, sysdev);

	return mem;
}

int remove_memory_block(unsigned long node_id, struct mem_section *section,
		int phys_device)
{
	struct memory_block *mem;

	mem = find_memory_block(section);
	unregister_mem_sect_under_nodes(mem);
	mem_remove_simple_file(mem, phys_index);
	mem_remove_simple_file(mem, state);
	mem_remove_simple_file(mem, phys_device);
	mem_remove_simple_file(mem, removable);
	unregister_memory(mem, section);

	return 0;
}

/*
 * need an interface for the VM to add new memory regions,
 * but without onlining it.
 */
int register_new_memory(int nid, struct mem_section *section)
{
	return add_memory_block(nid, section, MEM_OFFLINE, 0, HOTPLUG);
}

int unregister_memory_section(struct mem_section *section)
{
	if (!present_section(section))
		return -EINVAL;

	return remove_memory_block(0, section, 0);
}

/*
 * Initialize the sysfs support for memory devices...
 */
int __init memory_dev_init(void)
{
	unsigned int i;
	int ret;
	int err;

	memory_sysdev_class.kset.uevent_ops = &memory_uevent_ops;
	ret = sysdev_class_register(&memory_sysdev_class);
	if (ret)
		goto out;

	/*
	 * Create entries for memory sections that were found
	 * during boot and have been initialized
	 */
	for (i = 0; i < NR_MEM_SECTIONS; i++) {
		if (!present_section_nr(i))
			continue;
		err = add_memory_block(0, __nr_to_section(i), MEM_ONLINE,
					0, BOOT);
		if (!ret)
			ret = err;
	}

	err = memory_probe_init();
	if (!ret)
		ret = err;
	err = block_size_init();
	if (!ret)
		ret = err;
out:
	if (ret)
		printk(KERN_ERR "%s() failed: %d\n", __func__, ret);
	return ret;
}
Commit	Line	Data
3947be19 DH	1	/*
	2	* drivers/base/memory.c - basic Memory class support
	3	*
	4	* Written by Matt Tolentino <matthew.e.tolentino@intel.com>
	5	* Dave Hansen <haveblue@us.ibm.com>
	6	*
	7	* This file provides the necessary infrastructure to represent
	8	* a SPARSEMEM-memory-model system's physical memory in /sysfs.
	9	* All arch-independent code that assumes MEMORY_HOTPLUG requires
	10	* SPARSEMEM should be contained here, or in mm/memory_hotplug.c.
	11	*/
	12
	13	#include <linux/sysdev.h>
	14	#include <linux/module.h>
	15	#include <linux/init.h>
3947be19	16	#include <linux/topology.h>
c59ede7b	17	#include <linux/capability.h>
3947be19 DH	18	#include <linux/device.h>
	19	#include <linux/memory.h>
	20	#include <linux/kobject.h>
	21	#include <linux/memory_hotplug.h>
	22	#include <linux/mm.h>
da19cbcf	23	#include <linux/mutex.h>
9f1b16a5 SL	24	#include <linux/stat.h>
9f1b16a5 SL	25
3947be19 DH	26	#include <asm/atomic.h>
	27	#include <asm/uaccess.h>
	28
	29	#define MEMORY_CLASS_NAME "memory"
	30
	31	static struct sysdev_class memory_sysdev_class = {
af5ca3f4	32	.name = MEMORY_CLASS_NAME,
3947be19	33	};
3947be19	34
312c004d	35	static const char memory_uevent_name(struct kset kset, struct kobject *kobj)
3947be19 DH	36	{
	37	return MEMORY_CLASS_NAME;
	38	}
	39
9ec0fd4e	40	static int memory_uevent(struct kset kset, struct kobject obj, struct kobj_uevent_env *env)
3947be19 DH	41	{
	42	int retval = 0;
	43
	44	return retval;
	45	}
	46
312c004d KS	47	static struct kset_uevent_ops memory_uevent_ops = {
	48	.name = memory_uevent_name,
	49	.uevent = memory_uevent,
3947be19 DH	50	};
3947be19 DH	51
e041c683	52	static BLOCKING_NOTIFIER_HEAD(memory_chain);
3947be19	53
98a38ebd	54	int register_memory_notifier(struct notifier_block *nb)
3947be19	55	{
e041c683	56	return blocking_notifier_chain_register(&memory_chain, nb);
3947be19	57	}
3c82c30c	58	EXPORT_SYMBOL(register_memory_notifier);
3947be19	59
98a38ebd	60	void unregister_memory_notifier(struct notifier_block *nb)
3947be19	61	{
e041c683	62	blocking_notifier_chain_unregister(&memory_chain, nb);
3947be19	63	}
3c82c30c	64	EXPORT_SYMBOL(unregister_memory_notifier);
3947be19 DH	65
	66	/*
	67	* register_memory - Setup a sysfs device for a memory block
	68	*/
00a41db5 BP	69	static
00a41db5 BP	70	int register_memory(struct memory_block memory, struct mem_section section)
3947be19 DH	71	{
	72	int error;
	73
	74	memory->sysdev.cls = &memory_sysdev_class;
	75	memory->sysdev.id = __section_nr(section);
	76
	77	error = sysdev_register(&memory->sysdev);
3947be19 DH	78	return error;
	79	}
	80
	81	static void
00a41db5	82	unregister_memory(struct memory_block memory, struct mem_section section)
3947be19 DH	83	{
	84	BUG_ON(memory->sysdev.cls != &memory_sysdev_class);
	85	BUG_ON(memory->sysdev.id != __section_nr(section));
	86
00a41db5 BP	87	/* drop the ref. we got in remove_memory_block() */
00a41db5 BP	88	kobject_put(&memory->sysdev.kobj);
3947be19	89	sysdev_unregister(&memory->sysdev);
3947be19 DH	90	}
	91
	92	/*
	93	* use this as the physical section index that this memsection
	94	* uses.
	95	*/
	96
4a0b2b4d AK	97	static ssize_t show_mem_phys_index(struct sys_device *dev,
4a0b2b4d AK	98	struct sysdev_attribute attr, char buf)
3947be19 DH	99	{
	100	struct memory_block *mem =
	101	container_of(dev, struct memory_block, sysdev);
	102	return sprintf(buf, "%08lx\n", mem->phys_index);
	103	}
	104
5c755e9f BP	105	/*
	106	* Show whether the section of memory is likely to be hot-removable
	107	*/
1f07be1c SR	108	static ssize_t show_mem_removable(struct sys_device *dev,
1f07be1c SR	109	struct sysdev_attribute attr, char buf)
5c755e9f BP	110	{
	111	unsigned long start_pfn;
	112	int ret;
	113	struct memory_block *mem =
	114	container_of(dev, struct memory_block, sysdev);
	115
	116	start_pfn = section_nr_to_pfn(mem->phys_index);
	117	ret = is_mem_section_removable(start_pfn, PAGES_PER_SECTION);
	118	return sprintf(buf, "%d\n", ret);
	119	}
	120
3947be19 DH	121	/*
	122	* online, offline, going offline, etc.
	123	*/
4a0b2b4d AK	124	static ssize_t show_mem_state(struct sys_device *dev,
4a0b2b4d AK	125	struct sysdev_attribute attr, char buf)
3947be19 DH	126	{
	127	struct memory_block *mem =
	128	container_of(dev, struct memory_block, sysdev);
	129	ssize_t len = 0;
	130
	131	/*
	132	* We can probably put these states in a nice little array
	133	* so that they're not open-coded
	134	*/
	135	switch (mem->state) {
	136	case MEM_ONLINE:
	137	len = sprintf(buf, "online\n");
	138	break;
	139	case MEM_OFFLINE:
	140	len = sprintf(buf, "offline\n");
	141	break;
	142	case MEM_GOING_OFFLINE:
	143	len = sprintf(buf, "going-offline\n");
	144	break;
	145	default:
	146	len = sprintf(buf, "ERROR-UNKNOWN-%ld\n",
	147	mem->state);
	148	WARN_ON(1);
	149	break;
	150	}
	151
	152	return len;
	153	}
	154
7b78d335	155	int memory_notify(unsigned long val, void *v)
3947be19	156	{
e041c683	157	return blocking_notifier_call_chain(&memory_chain, val, v);
3947be19 DH	158	}
	159
	160	/*
	161	* MEMORY_HOTPLUG depends on SPARSEMEM in mm/Kconfig, so it is
	162	* OK to have direct references to sparsemem variables in here.
	163	*/
	164	static int
	165	memory_block_action(struct memory_block *mem, unsigned long action)
	166	{
	167	int i;
	168	unsigned long psection;
	169	unsigned long start_pfn, start_paddr;
	170	struct page *first_page;
	171	int ret;
	172	int old_state = mem->state;
	173
	174	psection = mem->phys_index;
	175	first_page = pfn_to_page(psection << PFN_SECTION_SHIFT);
	176
	177	/*
	178	* The probe routines leave the pages reserved, just
	179	* as the bootmem code does. Make sure they're still
	180	* that way.
	181	*/
	182	if (action == MEM_ONLINE) {
	183	for (i = 0; i < PAGES_PER_SECTION; i++) {
	184	if (PageReserved(first_page+i))
	185	continue;
	186
	187	printk(KERN_WARNING "section number %ld page number %d "
	188	"not reserved, was it already online? \n",
	189	psection, i);
	190	return -EBUSY;
	191	}
	192	}
	193
	194	switch (action) {
	195	case MEM_ONLINE:
	196	start_pfn = page_to_pfn(first_page);
	197	ret = online_pages(start_pfn, PAGES_PER_SECTION);
	198	break;
	199	case MEM_OFFLINE:
	200	mem->state = MEM_GOING_OFFLINE;
3947be19 DH	201	start_paddr = page_to_pfn(first_page) << PAGE_SHIFT;
	202	ret = remove_memory(start_paddr,
	203	PAGES_PER_SECTION << PAGE_SHIFT);
	204	if (ret) {
	205	mem->state = old_state;
	206	break;
	207	}
3947be19 DH	208	break;
3947be19 DH	209	default:
f810a5cf	210	WARN(1, KERN_WARNING "%s(%p, %ld) unknown action: %ld\n",
2b3a302a	211	__func__, mem, action, action);
3947be19 DH	212	ret = -EINVAL;
3947be19 DH	213	}
3947be19 DH	214
	215	return ret;
	216	}
	217
	218	static int memory_block_change_state(struct memory_block *mem,
	219	unsigned long to_state, unsigned long from_state_req)
	220	{
	221	int ret = 0;
da19cbcf	222	mutex_lock(&mem->state_mutex);
3947be19 DH	223
	224	if (mem->state != from_state_req) {
	225	ret = -EINVAL;
	226	goto out;
	227	}
	228
	229	ret = memory_block_action(mem, to_state);
	230	if (!ret)
	231	mem->state = to_state;
	232
	233	out:
da19cbcf	234	mutex_unlock(&mem->state_mutex);
3947be19 DH	235	return ret;
	236	}
	237
	238	static ssize_t
4a0b2b4d AK	239	store_mem_state(struct sys_device *dev,
4a0b2b4d AK	240	struct sysdev_attribute attr, const char buf, size_t count)
3947be19 DH	241	{
	242	struct memory_block *mem;
	243	unsigned int phys_section_nr;
	244	int ret = -EINVAL;
	245
	246	mem = container_of(dev, struct memory_block, sysdev);
	247	phys_section_nr = mem->phys_index;
	248
540557b9	249	if (!present_section_nr(phys_section_nr))
3947be19 DH	250	goto out;
	251
	252	if (!strncmp(buf, "online", min((int)count, 6)))
	253	ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE);
	254	else if(!strncmp(buf, "offline", min((int)count, 7)))
	255	ret = memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE);
	256	out:
	257	if (ret)
	258	return ret;
	259	return count;
	260	}
	261
	262	/*
	263	* phys_device is a bad name for this. What I really want
	264	* is a way to differentiate between memory ranges that
	265	* are part of physical devices that constitute
	266	* a complete removable unit or fru.
	267	* i.e. do these ranges belong to the same physical device,
	268	* s.t. if I offline all of these sections I can then
	269	* remove the physical device?
	270	*/
4a0b2b4d AK	271	static ssize_t show_phys_device(struct sys_device *dev,
4a0b2b4d AK	272	struct sysdev_attribute attr, char buf)
3947be19 DH	273	{
	274	struct memory_block *mem =
	275	container_of(dev, struct memory_block, sysdev);
	276	return sprintf(buf, "%d\n", mem->phys_device);
	277	}
	278
	279	static SYSDEV_ATTR(phys_index, 0444, show_mem_phys_index, NULL);
	280	static SYSDEV_ATTR(state, 0644, show_mem_state, store_mem_state);
	281	static SYSDEV_ATTR(phys_device, 0444, show_phys_device, NULL);
5c755e9f	282	static SYSDEV_ATTR(removable, 0444, show_mem_removable, NULL);
3947be19 DH	283
	284	#define mem_create_simple_file(mem, attr_name) \
	285	sysdev_create_file(&mem->sysdev, &attr_##attr_name)
	286	#define mem_remove_simple_file(mem, attr_name) \
	287	sysdev_remove_file(&mem->sysdev, &attr_##attr_name)
	288
	289	/*
	290	* Block size attribute stuff
	291	*/
	292	static ssize_t
	293	print_block_size(struct class class, char buf)
	294	{
	295	return sprintf(buf, "%lx\n", (unsigned long)PAGES_PER_SECTION * PAGE_SIZE);
	296	}
	297
	298	static CLASS_ATTR(block_size_bytes, 0444, print_block_size, NULL);
	299
	300	static int block_size_init(void)
	301	{
28ec24e2 AM	302	return sysfs_create_file(&memory_sysdev_class.kset.kobj,
28ec24e2 AM	303	&class_attr_block_size_bytes.attr);
3947be19 DH	304	}
	305
	306	/*
	307	* Some architectures will have custom drivers to do this, and
	308	* will not need to do it from userspace. The fake hot-add code
	309	* as well as ppc64 will do all of their discovery in userspace
	310	* and will require this interface.
	311	*/
	312	#ifdef CONFIG_ARCH_MEMORY_PROBE
	313	static ssize_t
be7ee9b2	314	memory_probe_store(struct class class, const char buf, size_t count)
3947be19 DH	315	{
3947be19 DH	316	u64 phys_addr;
bc02af93	317	int nid;
3947be19 DH	318	int ret;
	319
	320	phys_addr = simple_strtoull(buf, NULL, 0);
	321
bc02af93 YG	322	nid = memory_add_physaddr_to_nid(phys_addr);
bc02af93 YG	323	ret = add_memory(nid, phys_addr, PAGES_PER_SECTION << PAGE_SHIFT);
3947be19 DH	324
	325	if (ret)
	326	count = ret;
	327
	328	return count;
	329	}
9f1b16a5	330	static CLASS_ATTR(probe, S_IWUSR, NULL, memory_probe_store);
3947be19 DH	331
	332	static int memory_probe_init(void)
	333	{
28ec24e2 AM	334	return sysfs_create_file(&memory_sysdev_class.kset.kobj,
28ec24e2 AM	335	&class_attr_probe.attr);
3947be19 DH	336	}
3947be19 DH	337	#else
28ec24e2 AM	338	static inline int memory_probe_init(void)
	339	{
	340	return 0;
	341	}
3947be19 DH	342	#endif
	343
	344	/*
	345	* Note that phys_device is optional. It is here to allow for
	346	* differentiation between which physical devices each
	347	* section belongs to...
	348	*/
	349
c04fc586 GH	350	static int add_memory_block(int nid, struct mem_section *section,
	351	unsigned long state, int phys_device,
	352	enum mem_add_context context)
3947be19	353	{
0b0acbec	354	struct memory_block mem = kzalloc(sizeof(mem), GFP_KERNEL);
3947be19 DH	355	int ret = 0;
	356
	357	if (!mem)
	358	return -ENOMEM;
	359
3947be19 DH	360	mem->phys_index = __section_nr(section);
3947be19 DH	361	mem->state = state;
da19cbcf	362	mutex_init(&mem->state_mutex);
3947be19 DH	363	mem->phys_device = phys_device;
3947be19 DH	364
00a41db5	365	ret = register_memory(mem, section);
3947be19 DH	366	if (!ret)
	367	ret = mem_create_simple_file(mem, phys_index);
	368	if (!ret)
	369	ret = mem_create_simple_file(mem, state);
	370	if (!ret)
	371	ret = mem_create_simple_file(mem, phys_device);
5c755e9f BP	372	if (!ret)
5c755e9f BP	373	ret = mem_create_simple_file(mem, removable);
c04fc586 GH	374	if (!ret) {
	375	if (context == HOTPLUG)
	376	ret = register_mem_sect_under_node(mem, nid);
	377	}
3947be19 DH	378
	379	return ret;
	380	}
	381
	382	/*
	383	* For now, we have a linear search to go find the appropriate
	384	* memory_block corresponding to a particular phys_index. If
	385	* this gets to be a real problem, we can always use a radix
	386	* tree or something here.
	387	*
	388	* This could be made generic for all sysdev classes.
	389	*/
c04fc586	390	struct memory_block find_memory_block(struct mem_section section)
3947be19 DH	391	{
	392	struct kobject *kobj;
	393	struct sys_device *sysdev;
	394	struct memory_block *mem;
	395	char name[sizeof(MEMORY_CLASS_NAME) + 9 + 1];
	396
	397	/*
	398	* This only works because we know that section == sysdev->id
	399	* slightly redundant with sysdev_register()
	400	*/
	401	sprintf(&name[0], "%s%d", MEMORY_CLASS_NAME, __section_nr(section));
	402
	403	kobj = kset_find_obj(&memory_sysdev_class.kset, name);
	404	if (!kobj)
	405	return NULL;
	406
	407	sysdev = container_of(kobj, struct sys_device, kobj);
	408	mem = container_of(sysdev, struct memory_block, sysdev);
	409
	410	return mem;
	411	}
	412
	413	int remove_memory_block(unsigned long node_id, struct mem_section *section,
	414	int phys_device)
	415	{
	416	struct memory_block *mem;
	417
	418	mem = find_memory_block(section);
c04fc586	419	unregister_mem_sect_under_nodes(mem);
3947be19 DH	420	mem_remove_simple_file(mem, phys_index);
	421	mem_remove_simple_file(mem, state);
	422	mem_remove_simple_file(mem, phys_device);
5c755e9f	423	mem_remove_simple_file(mem, removable);
00a41db5	424	unregister_memory(mem, section);
3947be19 DH	425
	426	return 0;
	427	}
	428
	429	/*
	430	* need an interface for the VM to add new memory regions,
	431	* but without onlining it.
	432	*/
c04fc586	433	int register_new_memory(int nid, struct mem_section *section)
3947be19	434	{
c04fc586	435	return add_memory_block(nid, section, MEM_OFFLINE, 0, HOTPLUG);
3947be19 DH	436	}
	437
	438	int unregister_memory_section(struct mem_section *section)
	439	{
540557b9	440	if (!present_section(section))
3947be19 DH	441	return -EINVAL;
	442
	443	return remove_memory_block(0, section, 0);
	444	}
	445
	446	/*
	447	* Initialize the sysfs support for memory devices...
	448	*/
	449	int __init memory_dev_init(void)
	450	{
	451	unsigned int i;
	452	int ret;
28ec24e2	453	int err;
3947be19	454
312c004d	455	memory_sysdev_class.kset.uevent_ops = &memory_uevent_ops;
3947be19	456	ret = sysdev_class_register(&memory_sysdev_class);
28ec24e2 AM	457	if (ret)
28ec24e2 AM	458	goto out;
3947be19 DH	459
	460	/*
	461	* Create entries for memory sections that were found
	462	* during boot and have been initialized
	463	*/
	464	for (i = 0; i < NR_MEM_SECTIONS; i++) {
540557b9	465	if (!present_section_nr(i))
3947be19	466	continue;
c04fc586 GH	467	err = add_memory_block(0, __nr_to_section(i), MEM_ONLINE,
c04fc586 GH	468	0, BOOT);
28ec24e2 AM	469	if (!ret)
28ec24e2 AM	470	ret = err;
3947be19 DH	471	}
3947be19 DH	472
28ec24e2 AM	473	err = memory_probe_init();
	474	if (!ret)
	475	ret = err;
	476	err = block_size_init();
	477	if (!ret)
	478	ret = err;
	479	out:
	480	if (ret)
2b3a302a	481	printk(KERN_ERR "%s() failed: %d\n", __func__, ret);
3947be19 DH	482	return ret;
3947be19 DH	483	}