[deliverable/linux.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 <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);
}

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

/*
 * 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, char *buf)
{
	struct memory_block *mem =
		container_of(dev, struct memory_block, sysdev);
	return sprintf(buf, "%08lx\n", mem->phys_index);
}

/*
 * online, offline, going offline, etc.
 */
static ssize_t show_mem_state(struct sys_device *dev, 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:
			printk(KERN_WARNING "%s(%p, %ld) unknown action: %ld\n",
					__func__, mem, action, action);
			WARN_ON(1);
			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, 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, 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);

#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, 0700, 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(unsigned long node_id, struct mem_section *section,
		     unsigned long state, int phys_device)
{
	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);

	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.
 */
static 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);
	mem_remove_simple_file(mem, phys_index);
	mem_remove_simple_file(mem, state);
	mem_remove_simple_file(mem, phys_device);
	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(struct mem_section *section)
{
	return add_memory_block(0, section, MEM_OFFLINE, 0);
}

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);
		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>
3947be19 DH	24	#include <asm/atomic.h>
	25	#include <asm/uaccess.h>
	26
	27	#define MEMORY_CLASS_NAME "memory"
	28
	29	static struct sysdev_class memory_sysdev_class = {
af5ca3f4	30	.name = MEMORY_CLASS_NAME,
3947be19	31	};
3947be19	32
312c004d	33	static const char memory_uevent_name(struct kset kset, struct kobject *kobj)
3947be19 DH	34	{
	35	return MEMORY_CLASS_NAME;
	36	}
	37
9ec0fd4e	38	static int memory_uevent(struct kset kset, struct kobject obj, struct kobj_uevent_env *env)
3947be19 DH	39	{
	40	int retval = 0;
	41
	42	return retval;
	43	}
	44
312c004d KS	45	static struct kset_uevent_ops memory_uevent_ops = {
	46	.name = memory_uevent_name,
	47	.uevent = memory_uevent,
3947be19 DH	48	};
3947be19 DH	49
e041c683	50	static BLOCKING_NOTIFIER_HEAD(memory_chain);
3947be19	51
98a38ebd	52	int register_memory_notifier(struct notifier_block *nb)
3947be19	53	{
e041c683	54	return blocking_notifier_chain_register(&memory_chain, nb);
3947be19 DH	55	}
3947be19 DH	56
98a38ebd	57	void unregister_memory_notifier(struct notifier_block *nb)
3947be19	58	{
e041c683	59	blocking_notifier_chain_unregister(&memory_chain, nb);
3947be19 DH	60	}
	61
	62	/*
	63	* register_memory - Setup a sysfs device for a memory block
	64	*/
00a41db5 BP	65	static
00a41db5 BP	66	int register_memory(struct memory_block memory, struct mem_section section)
3947be19 DH	67	{
	68	int error;
	69
	70	memory->sysdev.cls = &memory_sysdev_class;
	71	memory->sysdev.id = __section_nr(section);
	72
	73	error = sysdev_register(&memory->sysdev);
3947be19 DH	74	return error;
	75	}
	76
	77	static void
00a41db5	78	unregister_memory(struct memory_block memory, struct mem_section section)
3947be19 DH	79	{
	80	BUG_ON(memory->sysdev.cls != &memory_sysdev_class);
	81	BUG_ON(memory->sysdev.id != __section_nr(section));
	82
00a41db5 BP	83	/* drop the ref. we got in remove_memory_block() */
00a41db5 BP	84	kobject_put(&memory->sysdev.kobj);
3947be19	85	sysdev_unregister(&memory->sysdev);
3947be19 DH	86	}
	87
	88	/*
	89	* use this as the physical section index that this memsection
	90	* uses.
	91	*/
	92
	93	static ssize_t show_mem_phys_index(struct sys_device dev, char buf)
	94	{
	95	struct memory_block *mem =
	96	container_of(dev, struct memory_block, sysdev);
	97	return sprintf(buf, "%08lx\n", mem->phys_index);
	98	}
	99
	100	/*
	101	* online, offline, going offline, etc.
	102	*/
	103	static ssize_t show_mem_state(struct sys_device dev, char buf)
	104	{
	105	struct memory_block *mem =
	106	container_of(dev, struct memory_block, sysdev);
	107	ssize_t len = 0;
	108
	109	/*
	110	* We can probably put these states in a nice little array
	111	* so that they're not open-coded
	112	*/
	113	switch (mem->state) {
	114	case MEM_ONLINE:
	115	len = sprintf(buf, "online\n");
	116	break;
	117	case MEM_OFFLINE:
	118	len = sprintf(buf, "offline\n");
	119	break;
	120	case MEM_GOING_OFFLINE:
	121	len = sprintf(buf, "going-offline\n");
	122	break;
	123	default:
	124	len = sprintf(buf, "ERROR-UNKNOWN-%ld\n",
	125	mem->state);
	126	WARN_ON(1);
	127	break;
	128	}
	129
	130	return len;
	131	}
	132
7b78d335	133	int memory_notify(unsigned long val, void *v)
3947be19	134	{
e041c683	135	return blocking_notifier_call_chain(&memory_chain, val, v);
3947be19 DH	136	}
	137
	138	/*
	139	* MEMORY_HOTPLUG depends on SPARSEMEM in mm/Kconfig, so it is
	140	* OK to have direct references to sparsemem variables in here.
	141	*/
	142	static int
	143	memory_block_action(struct memory_block *mem, unsigned long action)
	144	{
	145	int i;
	146	unsigned long psection;
	147	unsigned long start_pfn, start_paddr;
	148	struct page *first_page;
	149	int ret;
	150	int old_state = mem->state;
	151
	152	psection = mem->phys_index;
	153	first_page = pfn_to_page(psection << PFN_SECTION_SHIFT);
	154
	155	/*
	156	* The probe routines leave the pages reserved, just
	157	* as the bootmem code does. Make sure they're still
	158	* that way.
	159	*/
	160	if (action == MEM_ONLINE) {
	161	for (i = 0; i < PAGES_PER_SECTION; i++) {
	162	if (PageReserved(first_page+i))
	163	continue;
	164
	165	printk(KERN_WARNING "section number %ld page number %d "
	166	"not reserved, was it already online? \n",
	167	psection, i);
	168	return -EBUSY;
	169	}
	170	}
	171
	172	switch (action) {
	173	case MEM_ONLINE:
	174	start_pfn = page_to_pfn(first_page);
	175	ret = online_pages(start_pfn, PAGES_PER_SECTION);
	176	break;
	177	case MEM_OFFLINE:
	178	mem->state = MEM_GOING_OFFLINE;
3947be19 DH	179	start_paddr = page_to_pfn(first_page) << PAGE_SHIFT;
	180	ret = remove_memory(start_paddr,
	181	PAGES_PER_SECTION << PAGE_SHIFT);
	182	if (ret) {
	183	mem->state = old_state;
	184	break;
	185	}
3947be19 DH	186	break;
	187	default:
	188	printk(KERN_WARNING "%s(%p, %ld) unknown action: %ld\n",
2b3a302a	189	__func__, mem, action, action);
3947be19 DH	190	WARN_ON(1);
	191	ret = -EINVAL;
	192	}
3947be19 DH	193
	194	return ret;
	195	}
	196
	197	static int memory_block_change_state(struct memory_block *mem,
	198	unsigned long to_state, unsigned long from_state_req)
	199	{
	200	int ret = 0;
da19cbcf	201	mutex_lock(&mem->state_mutex);
3947be19 DH	202
	203	if (mem->state != from_state_req) {
	204	ret = -EINVAL;
	205	goto out;
	206	}
	207
	208	ret = memory_block_action(mem, to_state);
	209	if (!ret)
	210	mem->state = to_state;
	211
	212	out:
da19cbcf	213	mutex_unlock(&mem->state_mutex);
3947be19 DH	214	return ret;
	215	}
	216
	217	static ssize_t
	218	store_mem_state(struct sys_device dev, const char buf, size_t count)
	219	{
	220	struct memory_block *mem;
	221	unsigned int phys_section_nr;
	222	int ret = -EINVAL;
	223
	224	mem = container_of(dev, struct memory_block, sysdev);
	225	phys_section_nr = mem->phys_index;
	226
540557b9	227	if (!present_section_nr(phys_section_nr))
3947be19 DH	228	goto out;
	229
	230	if (!strncmp(buf, "online", min((int)count, 6)))
	231	ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE);
	232	else if(!strncmp(buf, "offline", min((int)count, 7)))
	233	ret = memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE);
	234	out:
	235	if (ret)
	236	return ret;
	237	return count;
	238	}
	239
	240	/*
	241	* phys_device is a bad name for this. What I really want
	242	* is a way to differentiate between memory ranges that
	243	* are part of physical devices that constitute
	244	* a complete removable unit or fru.
	245	* i.e. do these ranges belong to the same physical device,
	246	* s.t. if I offline all of these sections I can then
	247	* remove the physical device?
	248	*/
	249	static ssize_t show_phys_device(struct sys_device dev, char buf)
	250	{
	251	struct memory_block *mem =
	252	container_of(dev, struct memory_block, sysdev);
	253	return sprintf(buf, "%d\n", mem->phys_device);
	254	}
	255
	256	static SYSDEV_ATTR(phys_index, 0444, show_mem_phys_index, NULL);
	257	static SYSDEV_ATTR(state, 0644, show_mem_state, store_mem_state);
	258	static SYSDEV_ATTR(phys_device, 0444, show_phys_device, NULL);
	259
	260	#define mem_create_simple_file(mem, attr_name) \
	261	sysdev_create_file(&mem->sysdev, &attr_##attr_name)
	262	#define mem_remove_simple_file(mem, attr_name) \
	263	sysdev_remove_file(&mem->sysdev, &attr_##attr_name)
	264
	265	/*
	266	* Block size attribute stuff
	267	*/
	268	static ssize_t
	269	print_block_size(struct class class, char buf)
	270	{
	271	return sprintf(buf, "%lx\n", (unsigned long)PAGES_PER_SECTION * PAGE_SIZE);
	272	}
	273
	274	static CLASS_ATTR(block_size_bytes, 0444, print_block_size, NULL);
	275
	276	static int block_size_init(void)
	277	{
28ec24e2 AM	278	return sysfs_create_file(&memory_sysdev_class.kset.kobj,
28ec24e2 AM	279	&class_attr_block_size_bytes.attr);
3947be19 DH	280	}
	281
	282	/*
	283	* Some architectures will have custom drivers to do this, and
	284	* will not need to do it from userspace. The fake hot-add code
	285	* as well as ppc64 will do all of their discovery in userspace
	286	* and will require this interface.
	287	*/
	288	#ifdef CONFIG_ARCH_MEMORY_PROBE
	289	static ssize_t
be7ee9b2	290	memory_probe_store(struct class class, const char buf, size_t count)
3947be19 DH	291	{
3947be19 DH	292	u64 phys_addr;
bc02af93	293	int nid;
3947be19 DH	294	int ret;
	295
	296	phys_addr = simple_strtoull(buf, NULL, 0);
	297
bc02af93 YG	298	nid = memory_add_physaddr_to_nid(phys_addr);
bc02af93 YG	299	ret = add_memory(nid, phys_addr, PAGES_PER_SECTION << PAGE_SHIFT);
3947be19 DH	300
	301	if (ret)
	302	count = ret;
	303
	304	return count;
	305	}
	306	static CLASS_ATTR(probe, 0700, NULL, memory_probe_store);
	307
	308	static int memory_probe_init(void)
	309	{
28ec24e2 AM	310	return sysfs_create_file(&memory_sysdev_class.kset.kobj,
28ec24e2 AM	311	&class_attr_probe.attr);
3947be19 DH	312	}
3947be19 DH	313	#else
28ec24e2 AM	314	static inline int memory_probe_init(void)
	315	{
	316	return 0;
	317	}
3947be19 DH	318	#endif
	319
	320	/*
	321	* Note that phys_device is optional. It is here to allow for
	322	* differentiation between which physical devices each
	323	* section belongs to...
	324	*/
	325
	326	static int add_memory_block(unsigned long node_id, struct mem_section *section,
	327	unsigned long state, int phys_device)
	328	{
0b0acbec	329	struct memory_block mem = kzalloc(sizeof(mem), GFP_KERNEL);
3947be19 DH	330	int ret = 0;
	331
	332	if (!mem)
	333	return -ENOMEM;
	334
3947be19 DH	335	mem->phys_index = __section_nr(section);
3947be19 DH	336	mem->state = state;
da19cbcf	337	mutex_init(&mem->state_mutex);
3947be19 DH	338	mem->phys_device = phys_device;
3947be19 DH	339
00a41db5	340	ret = register_memory(mem, section);
3947be19 DH	341	if (!ret)
	342	ret = mem_create_simple_file(mem, phys_index);
	343	if (!ret)
	344	ret = mem_create_simple_file(mem, state);
	345	if (!ret)
	346	ret = mem_create_simple_file(mem, phys_device);
	347
	348	return ret;
	349	}
	350
	351	/*
	352	* For now, we have a linear search to go find the appropriate
	353	* memory_block corresponding to a particular phys_index. If
	354	* this gets to be a real problem, we can always use a radix
	355	* tree or something here.
	356	*
	357	* This could be made generic for all sysdev classes.
	358	*/
	359	static struct memory_block find_memory_block(struct mem_section section)
	360	{
	361	struct kobject *kobj;
	362	struct sys_device *sysdev;
	363	struct memory_block *mem;
	364	char name[sizeof(MEMORY_CLASS_NAME) + 9 + 1];
	365
	366	/*
	367	* This only works because we know that section == sysdev->id
	368	* slightly redundant with sysdev_register()
	369	*/
	370	sprintf(&name[0], "%s%d", MEMORY_CLASS_NAME, __section_nr(section));
	371
	372	kobj = kset_find_obj(&memory_sysdev_class.kset, name);
	373	if (!kobj)
	374	return NULL;
	375
	376	sysdev = container_of(kobj, struct sys_device, kobj);
	377	mem = container_of(sysdev, struct memory_block, sysdev);
	378
	379	return mem;
	380	}
	381
	382	int remove_memory_block(unsigned long node_id, struct mem_section *section,
	383	int phys_device)
	384	{
	385	struct memory_block *mem;
	386
	387	mem = find_memory_block(section);
	388	mem_remove_simple_file(mem, phys_index);
	389	mem_remove_simple_file(mem, state);
	390	mem_remove_simple_file(mem, phys_device);
00a41db5	391	unregister_memory(mem, section);
3947be19 DH	392
	393	return 0;
	394	}
	395
	396	/*
	397	* need an interface for the VM to add new memory regions,
	398	* but without onlining it.
	399	*/
	400	int register_new_memory(struct mem_section *section)
	401	{
	402	return add_memory_block(0, section, MEM_OFFLINE, 0);
	403	}
	404
	405	int unregister_memory_section(struct mem_section *section)
	406	{
540557b9	407	if (!present_section(section))
3947be19 DH	408	return -EINVAL;
	409
	410	return remove_memory_block(0, section, 0);
	411	}
	412
	413	/*
	414	* Initialize the sysfs support for memory devices...
	415	*/
	416	int __init memory_dev_init(void)
	417	{
	418	unsigned int i;
	419	int ret;
28ec24e2	420	int err;
3947be19	421
312c004d	422	memory_sysdev_class.kset.uevent_ops = &memory_uevent_ops;
3947be19	423	ret = sysdev_class_register(&memory_sysdev_class);
28ec24e2 AM	424	if (ret)
28ec24e2 AM	425	goto out;
3947be19 DH	426
	427	/*
	428	* Create entries for memory sections that were found
	429	* during boot and have been initialized
	430	*/
	431	for (i = 0; i < NR_MEM_SECTIONS; i++) {
540557b9	432	if (!present_section_nr(i))
3947be19	433	continue;
28ec24e2 AM	434	err = add_memory_block(0, __nr_to_section(i), MEM_ONLINE, 0);
	435	if (!ret)
	436	ret = err;
3947be19 DH	437	}
3947be19 DH	438
28ec24e2 AM	439	err = memory_probe_init();
	440	if (!ret)
	441	ret = err;
	442	err = block_size_init();
	443	if (!ret)
	444	ret = err;
	445	out:
	446	if (ret)
2b3a302a	447	printk(KERN_ERR "%s() failed: %d\n", __func__, ret);
3947be19 DH	448	return ret;
3947be19 DH	449	}