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

#define MEMORY_CLASS_NAME	"memory"

static struct sysdev_class memory_sysdev_class = {
	set_kset_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
 */
int register_memory(struct memory_block *memory, struct mem_section *section,
		struct node *root)
{
	int error;

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

	error = sysdev_register(&memory->sysdev);

	if (root && !error)
		error = sysfs_create_link(&root->sysdev.kobj,
					  &memory->sysdev.kobj,
					  kobject_name(&memory->sysdev.kobj));

	return error;
}

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

	sysdev_unregister(&memory->sysdev);
	if (root)
		sysfs_remove_link(&root->sysdev.kobj,
				  kobject_name(&memory->sysdev.kobj));
}

/*
 * 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;
}

static inline 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;
			memory_notify(MEM_GOING_OFFLINE, NULL);
			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;
			}
			memory_notify(MEM_MAPPING_INVALID, NULL);
			break;
		default:
			printk(KERN_WARNING "%s(%p, %ld) unknown action: %ld\n",
					__FUNCTION__, mem, action, action);
			WARN_ON(1);
			ret = -EINVAL;
	}
	/*
	 * For now, only notify on successful memory operations
	 */
	if (!ret)
		memory_notify(action, NULL);

	return ret;
}

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

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

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

out:
	up(&mem->state_sem);
	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;
	init_MUTEX(&mem->state_sem);
	mem->phys_device = phys_device;

	ret = register_memory(mem, section, NULL);
	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, NULL);

	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", __FUNCTION__, 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>
	23	#include <asm/atomic.h>
	24	#include <asm/uaccess.h>
	25
	26	#define MEMORY_CLASS_NAME "memory"
	27
	28	static struct sysdev_class memory_sysdev_class = {
	29	set_kset_name(MEMORY_CLASS_NAME),
	30	};
3947be19	31
312c004d	32	static const char memory_uevent_name(struct kset kset, struct kobject *kobj)
3947be19 DH	33	{
	34	return MEMORY_CLASS_NAME;
	35	}
	36
9ec0fd4e	37	static int memory_uevent(struct kset kset, struct kobject obj, struct kobj_uevent_env *env)
3947be19 DH	38	{
	39	int retval = 0;
	40
	41	return retval;
	42	}
	43
312c004d KS	44	static struct kset_uevent_ops memory_uevent_ops = {
	45	.name = memory_uevent_name,
	46	.uevent = memory_uevent,
3947be19 DH	47	};
3947be19 DH	48
e041c683	49	static BLOCKING_NOTIFIER_HEAD(memory_chain);
3947be19	50
98a38ebd	51	int register_memory_notifier(struct notifier_block *nb)
3947be19	52	{
e041c683	53	return blocking_notifier_chain_register(&memory_chain, nb);
3947be19 DH	54	}
3947be19 DH	55
98a38ebd	56	void unregister_memory_notifier(struct notifier_block *nb)
3947be19	57	{
e041c683	58	blocking_notifier_chain_unregister(&memory_chain, nb);
3947be19 DH	59	}
	60
	61	/*
	62	* register_memory - Setup a sysfs device for a memory block
	63	*/
900b2b46	64	int register_memory(struct memory_block memory, struct mem_section section,
3947be19 DH	65	struct node *root)
	66	{
	67	int error;
	68
	69	memory->sysdev.cls = &memory_sysdev_class;
	70	memory->sysdev.id = __section_nr(section);
	71
	72	error = sysdev_register(&memory->sysdev);
	73
	74	if (root && !error)
	75	error = sysfs_create_link(&root->sysdev.kobj,
	76	&memory->sysdev.kobj,
	77	kobject_name(&memory->sysdev.kobj));
	78
	79	return error;
	80	}
	81
	82	static void
	83	unregister_memory(struct memory_block memory, struct mem_section section,
	84	struct node *root)
	85	{
	86	BUG_ON(memory->sysdev.cls != &memory_sysdev_class);
	87	BUG_ON(memory->sysdev.id != __section_nr(section));
	88
	89	sysdev_unregister(&memory->sysdev);
	90	if (root)
	91	sysfs_remove_link(&root->sysdev.kobj,
	92	kobject_name(&memory->sysdev.kobj));
	93	}
	94
	95	/*
	96	* use this as the physical section index that this memsection
	97	* uses.
	98	*/
	99
	100	static ssize_t show_mem_phys_index(struct sys_device dev, char buf)
	101	{
	102	struct memory_block *mem =
	103	container_of(dev, struct memory_block, sysdev);
	104	return sprintf(buf, "%08lx\n", mem->phys_index);
	105	}
	106
	107	/*
	108	* online, offline, going offline, etc.
	109	*/
	110	static ssize_t show_mem_state(struct sys_device dev, char buf)
	111	{
	112	struct memory_block *mem =
	113	container_of(dev, struct memory_block, sysdev);
	114	ssize_t len = 0;
	115
	116	/*
	117	* We can probably put these states in a nice little array
	118	* so that they're not open-coded
	119	*/
	120	switch (mem->state) {
	121	case MEM_ONLINE:
	122	len = sprintf(buf, "online\n");
	123	break;
	124	case MEM_OFFLINE:
	125	len = sprintf(buf, "offline\n");
	126	break;
	127	case MEM_GOING_OFFLINE:
	128	len = sprintf(buf, "going-offline\n");
129	break;
130	default:
131	len = sprintf(buf, "ERROR-UNKNOWN-%ld\n",
132	mem->state);
133	WARN_ON(1);
134	break;
135	}
136
137	return len;
138	}
139
140	static inline int memory_notify(unsigned long val, void *v)
141	{
e041c683	142	return blocking_notifier_call_chain(&memory_chain, val, v);
3947be19 DH	143	}
	144
	145	/*
	146	* MEMORY_HOTPLUG depends on SPARSEMEM in mm/Kconfig, so it is
	147	* OK to have direct references to sparsemem variables in here.
	148	*/
	149	static int
	150	memory_block_action(struct memory_block *mem, unsigned long action)
	151	{
	152	int i;
	153	unsigned long psection;
	154	unsigned long start_pfn, start_paddr;
	155	struct page *first_page;
	156	int ret;
	157	int old_state = mem->state;
	158
	159	psection = mem->phys_index;
	160	first_page = pfn_to_page(psection << PFN_SECTION_SHIFT);
	161
	162	/*
	163	* The probe routines leave the pages reserved, just
	164	* as the bootmem code does. Make sure they're still
	165	* that way.
	166	*/
	167	if (action == MEM_ONLINE) {
	168	for (i = 0; i < PAGES_PER_SECTION; i++) {
	169	if (PageReserved(first_page+i))
	170	continue;
	171
	172	printk(KERN_WARNING "section number %ld page number %d "
	173	"not reserved, was it already online? \n",
	174	psection, i);
	175	return -EBUSY;
	176	}
	177	}
	178
	179	switch (action) {
	180	case MEM_ONLINE:
	181	start_pfn = page_to_pfn(first_page);
	182	ret = online_pages(start_pfn, PAGES_PER_SECTION);
	183	break;
	184	case MEM_OFFLINE:
	185	mem->state = MEM_GOING_OFFLINE;
	186	memory_notify(MEM_GOING_OFFLINE, NULL);
	187	start_paddr = page_to_pfn(first_page) << PAGE_SHIFT;
	188	ret = remove_memory(start_paddr,
	189	PAGES_PER_SECTION << PAGE_SHIFT);
	190	if (ret) {
	191	mem->state = old_state;
	192	break;
	193	}
	194	memory_notify(MEM_MAPPING_INVALID, NULL);
	195	break;
	196	default:
	197	printk(KERN_WARNING "%s(%p, %ld) unknown action: %ld\n",
	198	__FUNCTION__, mem, action, action);
	199	WARN_ON(1);
	200	ret = -EINVAL;
	201	}
	202	/*
	203	* For now, only notify on successful memory operations
	204	*/
	205	if (!ret)
	206	memory_notify(action, NULL);
207
208	return ret;
209	}
210
211	static int memory_block_change_state(struct memory_block *mem,
212	unsigned long to_state, unsigned long from_state_req)
213	{
214	int ret = 0;
215	down(&mem->state_sem);
216
217	if (mem->state != from_state_req) {
218	ret = -EINVAL;
219	goto out;
220	}
221
222	ret = memory_block_action(mem, to_state);
223	if (!ret)
224	mem->state = to_state;
225
226	out:
227	up(&mem->state_sem);
228	return ret;
229	}
230
231	static ssize_t
232	store_mem_state(struct sys_device dev, const char buf, size_t count)
233	{
234	struct memory_block *mem;
235	unsigned int phys_section_nr;
236	int ret = -EINVAL;
237
238	mem = container_of(dev, struct memory_block, sysdev);
239	phys_section_nr = mem->phys_index;
240
540557b9	241	if (!present_section_nr(phys_section_nr))
3947be19 DH	242	goto out;
	243
	244	if (!strncmp(buf, "online", min((int)count, 6)))
	245	ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE);
	246	else if(!strncmp(buf, "offline", min((int)count, 7)))
	247	ret = memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE);
	248	out:
	249	if (ret)
	250	return ret;
	251	return count;
	252	}
	253
	254	/*
	255	* phys_device is a bad name for this. What I really want
	256	* is a way to differentiate between memory ranges that
	257	* are part of physical devices that constitute
	258	* a complete removable unit or fru.
	259	* i.e. do these ranges belong to the same physical device,
	260	* s.t. if I offline all of these sections I can then
	261	* remove the physical device?
	262	*/
	263	static ssize_t show_phys_device(struct sys_device dev, char buf)
	264	{
	265	struct memory_block *mem =
	266	container_of(dev, struct memory_block, sysdev);
	267	return sprintf(buf, "%d\n", mem->phys_device);
	268	}
	269
	270	static SYSDEV_ATTR(phys_index, 0444, show_mem_phys_index, NULL);
	271	static SYSDEV_ATTR(state, 0644, show_mem_state, store_mem_state);
	272	static SYSDEV_ATTR(phys_device, 0444, show_phys_device, NULL);
	273
	274	#define mem_create_simple_file(mem, attr_name) \
	275	sysdev_create_file(&mem->sysdev, &attr_##attr_name)
	276	#define mem_remove_simple_file(mem, attr_name) \
	277	sysdev_remove_file(&mem->sysdev, &attr_##attr_name)
	278
	279	/*
	280	* Block size attribute stuff
	281	*/
	282	static ssize_t
	283	print_block_size(struct class class, char buf)
	284	{
	285	return sprintf(buf, "%lx\n", (unsigned long)PAGES_PER_SECTION * PAGE_SIZE);
	286	}
	287
	288	static CLASS_ATTR(block_size_bytes, 0444, print_block_size, NULL);
	289
	290	static int block_size_init(void)
	291	{
28ec24e2 AM	292	return sysfs_create_file(&memory_sysdev_class.kset.kobj,
28ec24e2 AM	293	&class_attr_block_size_bytes.attr);
3947be19 DH	294	}
	295
	296	/*
	297	* Some architectures will have custom drivers to do this, and
	298	* will not need to do it from userspace. The fake hot-add code
	299	* as well as ppc64 will do all of their discovery in userspace
	300	* and will require this interface.
	301	*/
	302	#ifdef CONFIG_ARCH_MEMORY_PROBE
	303	static ssize_t
be7ee9b2	304	memory_probe_store(struct class class, const char buf, size_t count)
3947be19 DH	305	{
3947be19 DH	306	u64 phys_addr;
bc02af93	307	int nid;
3947be19 DH	308	int ret;
	309
	310	phys_addr = simple_strtoull(buf, NULL, 0);
	311
bc02af93 YG	312	nid = memory_add_physaddr_to_nid(phys_addr);
bc02af93 YG	313	ret = add_memory(nid, phys_addr, PAGES_PER_SECTION << PAGE_SHIFT);
3947be19 DH	314
	315	if (ret)
	316	count = ret;
	317
	318	return count;
	319	}
	320	static CLASS_ATTR(probe, 0700, NULL, memory_probe_store);
	321
	322	static int memory_probe_init(void)
	323	{
28ec24e2 AM	324	return sysfs_create_file(&memory_sysdev_class.kset.kobj,
28ec24e2 AM	325	&class_attr_probe.attr);
3947be19 DH	326	}
3947be19 DH	327	#else
28ec24e2 AM	328	static inline int memory_probe_init(void)
	329	{
	330	return 0;
	331	}
3947be19 DH	332	#endif
	333
	334	/*
	335	* Note that phys_device is optional. It is here to allow for
	336	* differentiation between which physical devices each
	337	* section belongs to...
	338	*/
	339
	340	static int add_memory_block(unsigned long node_id, struct mem_section *section,
	341	unsigned long state, int phys_device)
	342	{
0b0acbec	343	struct memory_block mem = kzalloc(sizeof(mem), GFP_KERNEL);
3947be19 DH	344	int ret = 0;
	345
	346	if (!mem)
	347	return -ENOMEM;
	348
3947be19 DH	349	mem->phys_index = __section_nr(section);
	350	mem->state = state;
	351	init_MUTEX(&mem->state_sem);
	352	mem->phys_device = phys_device;
	353
	354	ret = register_memory(mem, section, NULL);
	355	if (!ret)
	356	ret = mem_create_simple_file(mem, phys_index);
	357	if (!ret)
	358	ret = mem_create_simple_file(mem, state);
	359	if (!ret)
	360	ret = mem_create_simple_file(mem, phys_device);
	361
	362	return ret;
	363	}
	364
	365	/*
	366	* For now, we have a linear search to go find the appropriate
	367	* memory_block corresponding to a particular phys_index. If
	368	* this gets to be a real problem, we can always use a radix
	369	* tree or something here.
	370	*
	371	* This could be made generic for all sysdev classes.
	372	*/
	373	static struct memory_block find_memory_block(struct mem_section section)
	374	{
	375	struct kobject *kobj;
	376	struct sys_device *sysdev;
	377	struct memory_block *mem;
	378	char name[sizeof(MEMORY_CLASS_NAME) + 9 + 1];
	379
	380	/*
	381	* This only works because we know that section == sysdev->id
	382	* slightly redundant with sysdev_register()
	383	*/
	384	sprintf(&name[0], "%s%d", MEMORY_CLASS_NAME, __section_nr(section));
	385
	386	kobj = kset_find_obj(&memory_sysdev_class.kset, name);
	387	if (!kobj)
	388	return NULL;
	389
	390	sysdev = container_of(kobj, struct sys_device, kobj);
	391	mem = container_of(sysdev, struct memory_block, sysdev);
	392
	393	return mem;
	394	}
	395
	396	int remove_memory_block(unsigned long node_id, struct mem_section *section,
	397	int phys_device)
	398	{
	399	struct memory_block *mem;
	400
	401	mem = find_memory_block(section);
	402	mem_remove_simple_file(mem, phys_index);
	403	mem_remove_simple_file(mem, state);
	404	mem_remove_simple_file(mem, phys_device);
	405	unregister_memory(mem, section, NULL);
	406
	407	return 0;
	408	}
	409
	410	/*
	411	* need an interface for the VM to add new memory regions,
	412	* but without onlining it.
413	*/
414	int register_new_memory(struct mem_section *section)
415	{
416	return add_memory_block(0, section, MEM_OFFLINE, 0);
417	}
418
419	int unregister_memory_section(struct mem_section *section)
420	{
540557b9	421	if (!present_section(section))
3947be19 DH	422	return -EINVAL;
	423
	424	return remove_memory_block(0, section, 0);
	425	}
	426
	427	/*
	428	* Initialize the sysfs support for memory devices...
	429	*/
	430	int __init memory_dev_init(void)
	431	{
	432	unsigned int i;
	433	int ret;
28ec24e2	434	int err;
3947be19	435
312c004d	436	memory_sysdev_class.kset.uevent_ops = &memory_uevent_ops;
3947be19	437	ret = sysdev_class_register(&memory_sysdev_class);
28ec24e2 AM	438	if (ret)
28ec24e2 AM	439	goto out;
3947be19 DH	440
	441	/*
	442	* Create entries for memory sections that were found
	443	* during boot and have been initialized
	444	*/
	445	for (i = 0; i < NR_MEM_SECTIONS; i++) {
540557b9	446	if (!present_section_nr(i))
3947be19	447	continue;
28ec24e2 AM	448	err = add_memory_block(0, __nr_to_section(i), MEM_ONLINE, 0);
	449	if (!ret)
	450	ret = err;
3947be19 DH	451	}
3947be19 DH	452
28ec24e2 AM	453	err = memory_probe_init();
	454	if (!ret)
	455	ret = err;
	456	err = block_size_init();
	457	if (!ret)
	458	ret = err;
	459	out:
	460	if (ret)
	461	printk(KERN_ERR "%s() failed: %d\n", __FUNCTION__, ret);
3947be19 DH	462	return ret;
3947be19 DH	463	}