blob: 933442f40321b1889b183cf4396486a4c35ad96f [file] [log] [blame]
Dave Hansen3947be12005-10-29 18:16:54 -07001/*
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>
Dave Hansen3947be12005-10-29 18:16:54 -070016#include <linux/topology.h>
Randy.Dunlapc59ede72006-01-11 12:17:46 -080017#include <linux/capability.h>
Dave Hansen3947be12005-10-29 18:16:54 -070018#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>
Daniel Walkerda19cbc2008-02-04 23:35:47 -080023#include <linux/mutex.h>
Shaohua Li9f1b16a2008-10-18 20:27:12 -070024#include <linux/stat.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090025#include <linux/slab.h>
Shaohua Li9f1b16a2008-10-18 20:27:12 -070026
Dave Hansen3947be12005-10-29 18:16:54 -070027#include <asm/atomic.h>
28#include <asm/uaccess.h>
29
30#define MEMORY_CLASS_NAME "memory"
31
32static struct sysdev_class memory_sysdev_class = {
Kay Sieversaf5ca3f2007-12-20 02:09:39 +010033 .name = MEMORY_CLASS_NAME,
Dave Hansen3947be12005-10-29 18:16:54 -070034};
Dave Hansen3947be12005-10-29 18:16:54 -070035
Kay Sievers312c0042005-11-16 09:00:00 +010036static const char *memory_uevent_name(struct kset *kset, struct kobject *kobj)
Dave Hansen3947be12005-10-29 18:16:54 -070037{
38 return MEMORY_CLASS_NAME;
39}
40
Al Viro9ec0fd4e2007-10-14 06:53:45 +010041static int memory_uevent(struct kset *kset, struct kobject *obj, struct kobj_uevent_env *env)
Dave Hansen3947be12005-10-29 18:16:54 -070042{
43 int retval = 0;
44
45 return retval;
46}
47
Emese Revfy9cd43612009-12-31 14:52:51 +010048static const struct kset_uevent_ops memory_uevent_ops = {
Kay Sievers312c0042005-11-16 09:00:00 +010049 .name = memory_uevent_name,
50 .uevent = memory_uevent,
Dave Hansen3947be12005-10-29 18:16:54 -070051};
52
Alan Sterne041c682006-03-27 01:16:30 -080053static BLOCKING_NOTIFIER_HEAD(memory_chain);
Dave Hansen3947be12005-10-29 18:16:54 -070054
Andy Whitcroft98a38eb2006-01-06 00:10:35 -080055int register_memory_notifier(struct notifier_block *nb)
Dave Hansen3947be12005-10-29 18:16:54 -070056{
Alan Sterne041c682006-03-27 01:16:30 -080057 return blocking_notifier_chain_register(&memory_chain, nb);
Dave Hansen3947be12005-10-29 18:16:54 -070058}
Hannes Hering3c82c302008-05-07 14:43:01 +020059EXPORT_SYMBOL(register_memory_notifier);
Dave Hansen3947be12005-10-29 18:16:54 -070060
Andy Whitcroft98a38eb2006-01-06 00:10:35 -080061void unregister_memory_notifier(struct notifier_block *nb)
Dave Hansen3947be12005-10-29 18:16:54 -070062{
Alan Sterne041c682006-03-27 01:16:30 -080063 blocking_notifier_chain_unregister(&memory_chain, nb);
Dave Hansen3947be12005-10-29 18:16:54 -070064}
Hannes Hering3c82c302008-05-07 14:43:01 +020065EXPORT_SYMBOL(unregister_memory_notifier);
Dave Hansen3947be12005-10-29 18:16:54 -070066
Robert Jennings925cc712009-12-17 14:44:38 +000067static ATOMIC_NOTIFIER_HEAD(memory_isolate_chain);
68
69int register_memory_isolate_notifier(struct notifier_block *nb)
70{
71 return atomic_notifier_chain_register(&memory_isolate_chain, nb);
72}
73EXPORT_SYMBOL(register_memory_isolate_notifier);
74
75void unregister_memory_isolate_notifier(struct notifier_block *nb)
76{
77 atomic_notifier_chain_unregister(&memory_isolate_chain, nb);
78}
79EXPORT_SYMBOL(unregister_memory_isolate_notifier);
80
Dave Hansen3947be12005-10-29 18:16:54 -070081/*
82 * register_memory - Setup a sysfs device for a memory block
83 */
Badari Pulavarty00a41db2008-02-11 09:23:18 -080084static
85int register_memory(struct memory_block *memory, struct mem_section *section)
Dave Hansen3947be12005-10-29 18:16:54 -070086{
87 int error;
88
89 memory->sysdev.cls = &memory_sysdev_class;
90 memory->sysdev.id = __section_nr(section);
91
92 error = sysdev_register(&memory->sysdev);
Dave Hansen3947be12005-10-29 18:16:54 -070093 return error;
94}
95
96static void
Badari Pulavarty00a41db2008-02-11 09:23:18 -080097unregister_memory(struct memory_block *memory, struct mem_section *section)
Dave Hansen3947be12005-10-29 18:16:54 -070098{
99 BUG_ON(memory->sysdev.cls != &memory_sysdev_class);
100 BUG_ON(memory->sysdev.id != __section_nr(section));
101
Badari Pulavarty00a41db2008-02-11 09:23:18 -0800102 /* drop the ref. we got in remove_memory_block() */
103 kobject_put(&memory->sysdev.kobj);
Dave Hansen3947be12005-10-29 18:16:54 -0700104 sysdev_unregister(&memory->sysdev);
Dave Hansen3947be12005-10-29 18:16:54 -0700105}
106
107/*
108 * use this as the physical section index that this memsection
109 * uses.
110 */
111
Andi Kleen4a0b2b42008-07-01 18:48:41 +0200112static ssize_t show_mem_phys_index(struct sys_device *dev,
113 struct sysdev_attribute *attr, char *buf)
Dave Hansen3947be12005-10-29 18:16:54 -0700114{
115 struct memory_block *mem =
116 container_of(dev, struct memory_block, sysdev);
117 return sprintf(buf, "%08lx\n", mem->phys_index);
118}
119
120/*
Badari Pulavarty5c755e92008-07-23 21:28:19 -0700121 * Show whether the section of memory is likely to be hot-removable
122 */
Stephen Rothwell1f07be12008-07-28 11:05:04 +1000123static ssize_t show_mem_removable(struct sys_device *dev,
124 struct sysdev_attribute *attr, char *buf)
Badari Pulavarty5c755e92008-07-23 21:28:19 -0700125{
126 unsigned long start_pfn;
127 int ret;
128 struct memory_block *mem =
129 container_of(dev, struct memory_block, sysdev);
130
131 start_pfn = section_nr_to_pfn(mem->phys_index);
132 ret = is_mem_section_removable(start_pfn, PAGES_PER_SECTION);
133 return sprintf(buf, "%d\n", ret);
134}
135
136/*
Dave Hansen3947be12005-10-29 18:16:54 -0700137 * online, offline, going offline, etc.
138 */
Andi Kleen4a0b2b42008-07-01 18:48:41 +0200139static ssize_t show_mem_state(struct sys_device *dev,
140 struct sysdev_attribute *attr, char *buf)
Dave Hansen3947be12005-10-29 18:16:54 -0700141{
142 struct memory_block *mem =
143 container_of(dev, struct memory_block, sysdev);
144 ssize_t len = 0;
145
146 /*
147 * We can probably put these states in a nice little array
148 * so that they're not open-coded
149 */
150 switch (mem->state) {
151 case MEM_ONLINE:
152 len = sprintf(buf, "online\n");
153 break;
154 case MEM_OFFLINE:
155 len = sprintf(buf, "offline\n");
156 break;
157 case MEM_GOING_OFFLINE:
158 len = sprintf(buf, "going-offline\n");
159 break;
160 default:
161 len = sprintf(buf, "ERROR-UNKNOWN-%ld\n",
162 mem->state);
163 WARN_ON(1);
164 break;
165 }
166
167 return len;
168}
169
Yasunori Goto7b78d332007-10-21 16:41:36 -0700170int memory_notify(unsigned long val, void *v)
Dave Hansen3947be12005-10-29 18:16:54 -0700171{
Alan Sterne041c682006-03-27 01:16:30 -0800172 return blocking_notifier_call_chain(&memory_chain, val, v);
Dave Hansen3947be12005-10-29 18:16:54 -0700173}
174
Robert Jennings925cc712009-12-17 14:44:38 +0000175int memory_isolate_notify(unsigned long val, void *v)
176{
177 return atomic_notifier_call_chain(&memory_isolate_chain, val, v);
178}
179
Dave Hansen3947be12005-10-29 18:16:54 -0700180/*
181 * MEMORY_HOTPLUG depends on SPARSEMEM in mm/Kconfig, so it is
182 * OK to have direct references to sparsemem variables in here.
183 */
184static int
185memory_block_action(struct memory_block *mem, unsigned long action)
186{
187 int i;
188 unsigned long psection;
189 unsigned long start_pfn, start_paddr;
190 struct page *first_page;
191 int ret;
192 int old_state = mem->state;
193
194 psection = mem->phys_index;
195 first_page = pfn_to_page(psection << PFN_SECTION_SHIFT);
196
197 /*
198 * The probe routines leave the pages reserved, just
199 * as the bootmem code does. Make sure they're still
200 * that way.
201 */
202 if (action == MEM_ONLINE) {
203 for (i = 0; i < PAGES_PER_SECTION; i++) {
204 if (PageReserved(first_page+i))
205 continue;
206
207 printk(KERN_WARNING "section number %ld page number %d "
208 "not reserved, was it already online? \n",
209 psection, i);
210 return -EBUSY;
211 }
212 }
213
214 switch (action) {
215 case MEM_ONLINE:
216 start_pfn = page_to_pfn(first_page);
217 ret = online_pages(start_pfn, PAGES_PER_SECTION);
218 break;
219 case MEM_OFFLINE:
220 mem->state = MEM_GOING_OFFLINE;
Dave Hansen3947be12005-10-29 18:16:54 -0700221 start_paddr = page_to_pfn(first_page) << PAGE_SHIFT;
222 ret = remove_memory(start_paddr,
223 PAGES_PER_SECTION << PAGE_SHIFT);
224 if (ret) {
225 mem->state = old_state;
226 break;
227 }
Dave Hansen3947be12005-10-29 18:16:54 -0700228 break;
229 default:
Arjan van de Venf810a5c2008-07-25 19:45:39 -0700230 WARN(1, KERN_WARNING "%s(%p, %ld) unknown action: %ld\n",
Harvey Harrison2b3a3022008-03-04 16:41:05 -0800231 __func__, mem, action, action);
Dave Hansen3947be12005-10-29 18:16:54 -0700232 ret = -EINVAL;
233 }
Dave Hansen3947be12005-10-29 18:16:54 -0700234
235 return ret;
236}
237
238static int memory_block_change_state(struct memory_block *mem,
239 unsigned long to_state, unsigned long from_state_req)
240{
241 int ret = 0;
Daniel Walkerda19cbc2008-02-04 23:35:47 -0800242 mutex_lock(&mem->state_mutex);
Dave Hansen3947be12005-10-29 18:16:54 -0700243
244 if (mem->state != from_state_req) {
245 ret = -EINVAL;
246 goto out;
247 }
248
249 ret = memory_block_action(mem, to_state);
250 if (!ret)
251 mem->state = to_state;
252
253out:
Daniel Walkerda19cbc2008-02-04 23:35:47 -0800254 mutex_unlock(&mem->state_mutex);
Dave Hansen3947be12005-10-29 18:16:54 -0700255 return ret;
256}
257
258static ssize_t
Andi Kleen4a0b2b42008-07-01 18:48:41 +0200259store_mem_state(struct sys_device *dev,
260 struct sysdev_attribute *attr, const char *buf, size_t count)
Dave Hansen3947be12005-10-29 18:16:54 -0700261{
262 struct memory_block *mem;
263 unsigned int phys_section_nr;
264 int ret = -EINVAL;
265
266 mem = container_of(dev, struct memory_block, sysdev);
267 phys_section_nr = mem->phys_index;
268
Andy Whitcroft540557b2007-10-16 01:24:11 -0700269 if (!present_section_nr(phys_section_nr))
Dave Hansen3947be12005-10-29 18:16:54 -0700270 goto out;
271
272 if (!strncmp(buf, "online", min((int)count, 6)))
273 ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE);
274 else if(!strncmp(buf, "offline", min((int)count, 7)))
275 ret = memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE);
276out:
277 if (ret)
278 return ret;
279 return count;
280}
281
282/*
283 * phys_device is a bad name for this. What I really want
284 * is a way to differentiate between memory ranges that
285 * are part of physical devices that constitute
286 * a complete removable unit or fru.
287 * i.e. do these ranges belong to the same physical device,
288 * s.t. if I offline all of these sections I can then
289 * remove the physical device?
290 */
Andi Kleen4a0b2b42008-07-01 18:48:41 +0200291static ssize_t show_phys_device(struct sys_device *dev,
292 struct sysdev_attribute *attr, char *buf)
Dave Hansen3947be12005-10-29 18:16:54 -0700293{
294 struct memory_block *mem =
295 container_of(dev, struct memory_block, sysdev);
296 return sprintf(buf, "%d\n", mem->phys_device);
297}
298
299static SYSDEV_ATTR(phys_index, 0444, show_mem_phys_index, NULL);
300static SYSDEV_ATTR(state, 0644, show_mem_state, store_mem_state);
301static SYSDEV_ATTR(phys_device, 0444, show_phys_device, NULL);
Badari Pulavarty5c755e92008-07-23 21:28:19 -0700302static SYSDEV_ATTR(removable, 0444, show_mem_removable, NULL);
Dave Hansen3947be12005-10-29 18:16:54 -0700303
304#define mem_create_simple_file(mem, attr_name) \
305 sysdev_create_file(&mem->sysdev, &attr_##attr_name)
306#define mem_remove_simple_file(mem, attr_name) \
307 sysdev_remove_file(&mem->sysdev, &attr_##attr_name)
308
309/*
310 * Block size attribute stuff
311 */
312static ssize_t
Andi Kleen8564a6c2010-01-05 12:48:06 +0100313print_block_size(struct sysdev_class *class, struct sysdev_class_attribute *attr,
314 char *buf)
Dave Hansen3947be12005-10-29 18:16:54 -0700315{
Linus Torvalds4dc86ae2010-04-09 10:05:33 -0700316 return sprintf(buf, "%lx\n", (unsigned long)PAGES_PER_SECTION * PAGE_SIZE);
Dave Hansen3947be12005-10-29 18:16:54 -0700317}
318
Andi Kleen8564a6c2010-01-05 12:48:06 +0100319static SYSDEV_CLASS_ATTR(block_size_bytes, 0444, print_block_size, NULL);
Dave Hansen3947be12005-10-29 18:16:54 -0700320
321static int block_size_init(void)
322{
Andrew Morton28ec24e2006-12-06 20:37:29 -0800323 return sysfs_create_file(&memory_sysdev_class.kset.kobj,
Andi Kleen8564a6c2010-01-05 12:48:06 +0100324 &attr_block_size_bytes.attr);
Dave Hansen3947be12005-10-29 18:16:54 -0700325}
326
327/*
328 * Some architectures will have custom drivers to do this, and
329 * will not need to do it from userspace. The fake hot-add code
330 * as well as ppc64 will do all of their discovery in userspace
331 * and will require this interface.
332 */
333#ifdef CONFIG_ARCH_MEMORY_PROBE
334static ssize_t
Andi Kleen28812fe2010-01-05 12:48:07 +0100335memory_probe_store(struct class *class, struct class_attribute *attr,
336 const char *buf, size_t count)
Dave Hansen3947be12005-10-29 18:16:54 -0700337{
338 u64 phys_addr;
Yasunori Gotobc02af92006-06-27 02:53:30 -0700339 int nid;
Dave Hansen3947be12005-10-29 18:16:54 -0700340 int ret;
341
342 phys_addr = simple_strtoull(buf, NULL, 0);
343
Yasunori Gotobc02af92006-06-27 02:53:30 -0700344 nid = memory_add_physaddr_to_nid(phys_addr);
345 ret = add_memory(nid, phys_addr, PAGES_PER_SECTION << PAGE_SHIFT);
Dave Hansen3947be12005-10-29 18:16:54 -0700346
347 if (ret)
348 count = ret;
349
350 return count;
351}
Greg Kroah-Hartmanbd796672010-01-19 13:08:16 -0800352static CLASS_ATTR(probe, S_IWUSR, NULL, memory_probe_store);
Dave Hansen3947be12005-10-29 18:16:54 -0700353
354static int memory_probe_init(void)
355{
Andrew Morton28ec24e2006-12-06 20:37:29 -0800356 return sysfs_create_file(&memory_sysdev_class.kset.kobj,
Greg Kroah-Hartmanbd796672010-01-19 13:08:16 -0800357 &class_attr_probe.attr);
Dave Hansen3947be12005-10-29 18:16:54 -0700358}
359#else
Andrew Morton28ec24e2006-12-06 20:37:29 -0800360static inline int memory_probe_init(void)
361{
362 return 0;
363}
Dave Hansen3947be12005-10-29 18:16:54 -0700364#endif
365
Andi Kleenfacb6012009-12-16 12:20:00 +0100366#ifdef CONFIG_MEMORY_FAILURE
367/*
368 * Support for offlining pages of memory
369 */
370
371/* Soft offline a page */
372static ssize_t
Andi Kleen28812fe2010-01-05 12:48:07 +0100373store_soft_offline_page(struct class *class,
374 struct class_attribute *attr,
375 const char *buf, size_t count)
Andi Kleenfacb6012009-12-16 12:20:00 +0100376{
377 int ret;
378 u64 pfn;
379 if (!capable(CAP_SYS_ADMIN))
380 return -EPERM;
381 if (strict_strtoull(buf, 0, &pfn) < 0)
382 return -EINVAL;
383 pfn >>= PAGE_SHIFT;
384 if (!pfn_valid(pfn))
385 return -ENXIO;
386 ret = soft_offline_page(pfn_to_page(pfn), 0);
387 return ret == 0 ? count : ret;
388}
389
390/* Forcibly offline a page, including killing processes. */
391static ssize_t
Andi Kleen28812fe2010-01-05 12:48:07 +0100392store_hard_offline_page(struct class *class,
393 struct class_attribute *attr,
394 const char *buf, size_t count)
Andi Kleenfacb6012009-12-16 12:20:00 +0100395{
396 int ret;
397 u64 pfn;
398 if (!capable(CAP_SYS_ADMIN))
399 return -EPERM;
400 if (strict_strtoull(buf, 0, &pfn) < 0)
401 return -EINVAL;
402 pfn >>= PAGE_SHIFT;
403 ret = __memory_failure(pfn, 0, 0);
404 return ret ? ret : count;
405}
406
Greg Kroah-Hartmanbd796672010-01-19 13:08:16 -0800407static CLASS_ATTR(soft_offline_page, 0644, NULL, store_soft_offline_page);
408static CLASS_ATTR(hard_offline_page, 0644, NULL, store_hard_offline_page);
Andi Kleenfacb6012009-12-16 12:20:00 +0100409
410static __init int memory_fail_init(void)
411{
412 int err;
413
414 err = sysfs_create_file(&memory_sysdev_class.kset.kobj,
Greg Kroah-Hartmanbd796672010-01-19 13:08:16 -0800415 &class_attr_soft_offline_page.attr);
Andi Kleenfacb6012009-12-16 12:20:00 +0100416 if (!err)
417 err = sysfs_create_file(&memory_sysdev_class.kset.kobj,
Greg Kroah-Hartmanbd796672010-01-19 13:08:16 -0800418 &class_attr_hard_offline_page.attr);
Andi Kleenfacb6012009-12-16 12:20:00 +0100419 return err;
420}
421#else
422static inline int memory_fail_init(void)
423{
424 return 0;
425}
426#endif
427
Dave Hansen3947be12005-10-29 18:16:54 -0700428/*
429 * Note that phys_device is optional. It is here to allow for
430 * differentiation between which *physical* devices each
431 * section belongs to...
432 */
Heiko Carstensbc32df02010-03-15 00:35:03 -0400433int __weak arch_get_memory_phys_device(unsigned long start_pfn)
434{
435 return 0;
436}
Dave Hansen3947be12005-10-29 18:16:54 -0700437
Gary Hadec04fc582009-01-06 14:39:14 -0800438static int add_memory_block(int nid, struct mem_section *section,
Heiko Carstensbc32df02010-03-15 00:35:03 -0400439 unsigned long state, enum mem_add_context context)
Dave Hansen3947be12005-10-29 18:16:54 -0700440{
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700441 struct memory_block *mem = kzalloc(sizeof(*mem), GFP_KERNEL);
Heiko Carstensbc32df02010-03-15 00:35:03 -0400442 unsigned long start_pfn;
Dave Hansen3947be12005-10-29 18:16:54 -0700443 int ret = 0;
444
445 if (!mem)
446 return -ENOMEM;
447
Dave Hansen3947be12005-10-29 18:16:54 -0700448 mem->phys_index = __section_nr(section);
449 mem->state = state;
Daniel Walkerda19cbc2008-02-04 23:35:47 -0800450 mutex_init(&mem->state_mutex);
Heiko Carstensbc32df02010-03-15 00:35:03 -0400451 start_pfn = section_nr_to_pfn(mem->phys_index);
452 mem->phys_device = arch_get_memory_phys_device(start_pfn);
Dave Hansen3947be12005-10-29 18:16:54 -0700453
Badari Pulavarty00a41db2008-02-11 09:23:18 -0800454 ret = register_memory(mem, section);
Dave Hansen3947be12005-10-29 18:16:54 -0700455 if (!ret)
456 ret = mem_create_simple_file(mem, phys_index);
457 if (!ret)
458 ret = mem_create_simple_file(mem, state);
459 if (!ret)
460 ret = mem_create_simple_file(mem, phys_device);
Badari Pulavarty5c755e92008-07-23 21:28:19 -0700461 if (!ret)
462 ret = mem_create_simple_file(mem, removable);
Gary Hadec04fc582009-01-06 14:39:14 -0800463 if (!ret) {
464 if (context == HOTPLUG)
465 ret = register_mem_sect_under_node(mem, nid);
466 }
Dave Hansen3947be12005-10-29 18:16:54 -0700467
468 return ret;
469}
470
471/*
472 * For now, we have a linear search to go find the appropriate
473 * memory_block corresponding to a particular phys_index. If
474 * this gets to be a real problem, we can always use a radix
475 * tree or something here.
476 *
477 * This could be made generic for all sysdev classes.
478 */
Gary Hadec04fc582009-01-06 14:39:14 -0800479struct memory_block *find_memory_block(struct mem_section *section)
Dave Hansen3947be12005-10-29 18:16:54 -0700480{
481 struct kobject *kobj;
482 struct sys_device *sysdev;
483 struct memory_block *mem;
484 char name[sizeof(MEMORY_CLASS_NAME) + 9 + 1];
485
486 /*
487 * This only works because we know that section == sysdev->id
488 * slightly redundant with sysdev_register()
489 */
490 sprintf(&name[0], "%s%d", MEMORY_CLASS_NAME, __section_nr(section));
491
492 kobj = kset_find_obj(&memory_sysdev_class.kset, name);
493 if (!kobj)
494 return NULL;
495
496 sysdev = container_of(kobj, struct sys_device, kobj);
497 mem = container_of(sysdev, struct memory_block, sysdev);
498
499 return mem;
500}
501
502int remove_memory_block(unsigned long node_id, struct mem_section *section,
503 int phys_device)
504{
505 struct memory_block *mem;
506
507 mem = find_memory_block(section);
Gary Hadec04fc582009-01-06 14:39:14 -0800508 unregister_mem_sect_under_nodes(mem);
Dave Hansen3947be12005-10-29 18:16:54 -0700509 mem_remove_simple_file(mem, phys_index);
510 mem_remove_simple_file(mem, state);
511 mem_remove_simple_file(mem, phys_device);
Badari Pulavarty5c755e92008-07-23 21:28:19 -0700512 mem_remove_simple_file(mem, removable);
Badari Pulavarty00a41db2008-02-11 09:23:18 -0800513 unregister_memory(mem, section);
Dave Hansen3947be12005-10-29 18:16:54 -0700514
515 return 0;
516}
517
518/*
519 * need an interface for the VM to add new memory regions,
520 * but without onlining it.
521 */
Gary Hadec04fc582009-01-06 14:39:14 -0800522int register_new_memory(int nid, struct mem_section *section)
Dave Hansen3947be12005-10-29 18:16:54 -0700523{
Heiko Carstensbc32df02010-03-15 00:35:03 -0400524 return add_memory_block(nid, section, MEM_OFFLINE, HOTPLUG);
Dave Hansen3947be12005-10-29 18:16:54 -0700525}
526
527int unregister_memory_section(struct mem_section *section)
528{
Andy Whitcroft540557b2007-10-16 01:24:11 -0700529 if (!present_section(section))
Dave Hansen3947be12005-10-29 18:16:54 -0700530 return -EINVAL;
531
532 return remove_memory_block(0, section, 0);
533}
534
535/*
536 * Initialize the sysfs support for memory devices...
537 */
538int __init memory_dev_init(void)
539{
540 unsigned int i;
541 int ret;
Andrew Morton28ec24e2006-12-06 20:37:29 -0800542 int err;
Dave Hansen3947be12005-10-29 18:16:54 -0700543
Kay Sievers312c0042005-11-16 09:00:00 +0100544 memory_sysdev_class.kset.uevent_ops = &memory_uevent_ops;
Dave Hansen3947be12005-10-29 18:16:54 -0700545 ret = sysdev_class_register(&memory_sysdev_class);
Andrew Morton28ec24e2006-12-06 20:37:29 -0800546 if (ret)
547 goto out;
Dave Hansen3947be12005-10-29 18:16:54 -0700548
549 /*
550 * Create entries for memory sections that were found
551 * during boot and have been initialized
552 */
553 for (i = 0; i < NR_MEM_SECTIONS; i++) {
Andy Whitcroft540557b2007-10-16 01:24:11 -0700554 if (!present_section_nr(i))
Dave Hansen3947be12005-10-29 18:16:54 -0700555 continue;
Gary Hadec04fc582009-01-06 14:39:14 -0800556 err = add_memory_block(0, __nr_to_section(i), MEM_ONLINE,
Heiko Carstensbc32df02010-03-15 00:35:03 -0400557 BOOT);
Andrew Morton28ec24e2006-12-06 20:37:29 -0800558 if (!ret)
559 ret = err;
Dave Hansen3947be12005-10-29 18:16:54 -0700560 }
561
Andrew Morton28ec24e2006-12-06 20:37:29 -0800562 err = memory_probe_init();
563 if (!ret)
564 ret = err;
Andi Kleenfacb6012009-12-16 12:20:00 +0100565 err = memory_fail_init();
566 if (!ret)
567 ret = err;
Andrew Morton28ec24e2006-12-06 20:37:29 -0800568 err = block_size_init();
569 if (!ret)
570 ret = err;
571out:
572 if (ret)
Harvey Harrison2b3a3022008-03-04 16:41:05 -0800573 printk(KERN_ERR "%s() failed: %d\n", __func__, ret);
Dave Hansen3947be12005-10-29 18:16:54 -0700574 return ret;
575}