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Commit | Line | Data |
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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 | 24 | #include <linux/stat.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
9f1b16a5 | 26 | |
3947be19 DH |
27 | #include <asm/atomic.h> |
28 | #include <asm/uaccess.h> | |
29 | ||
2938ffbd NF |
30 | static DEFINE_MUTEX(mem_sysfs_mutex); |
31 | ||
3947be19 DH |
32 | #define MEMORY_CLASS_NAME "memory" |
33 | ||
34 | static struct sysdev_class memory_sysdev_class = { | |
af5ca3f4 | 35 | .name = MEMORY_CLASS_NAME, |
3947be19 | 36 | }; |
3947be19 | 37 | |
312c004d | 38 | static const char *memory_uevent_name(struct kset *kset, struct kobject *kobj) |
3947be19 DH |
39 | { |
40 | return MEMORY_CLASS_NAME; | |
41 | } | |
42 | ||
9ec0fd4e | 43 | static int memory_uevent(struct kset *kset, struct kobject *obj, struct kobj_uevent_env *env) |
3947be19 DH |
44 | { |
45 | int retval = 0; | |
46 | ||
47 | return retval; | |
48 | } | |
49 | ||
9cd43611 | 50 | static const struct kset_uevent_ops memory_uevent_ops = { |
312c004d KS |
51 | .name = memory_uevent_name, |
52 | .uevent = memory_uevent, | |
3947be19 DH |
53 | }; |
54 | ||
e041c683 | 55 | static BLOCKING_NOTIFIER_HEAD(memory_chain); |
3947be19 | 56 | |
98a38ebd | 57 | int register_memory_notifier(struct notifier_block *nb) |
3947be19 | 58 | { |
e041c683 | 59 | return blocking_notifier_chain_register(&memory_chain, nb); |
3947be19 | 60 | } |
3c82c30c | 61 | EXPORT_SYMBOL(register_memory_notifier); |
3947be19 | 62 | |
98a38ebd | 63 | void unregister_memory_notifier(struct notifier_block *nb) |
3947be19 | 64 | { |
e041c683 | 65 | blocking_notifier_chain_unregister(&memory_chain, nb); |
3947be19 | 66 | } |
3c82c30c | 67 | EXPORT_SYMBOL(unregister_memory_notifier); |
3947be19 | 68 | |
925cc71e RJ |
69 | static ATOMIC_NOTIFIER_HEAD(memory_isolate_chain); |
70 | ||
71 | int register_memory_isolate_notifier(struct notifier_block *nb) | |
72 | { | |
73 | return atomic_notifier_chain_register(&memory_isolate_chain, nb); | |
74 | } | |
75 | EXPORT_SYMBOL(register_memory_isolate_notifier); | |
76 | ||
77 | void unregister_memory_isolate_notifier(struct notifier_block *nb) | |
78 | { | |
79 | atomic_notifier_chain_unregister(&memory_isolate_chain, nb); | |
80 | } | |
81 | EXPORT_SYMBOL(unregister_memory_isolate_notifier); | |
82 | ||
3947be19 DH |
83 | /* |
84 | * register_memory - Setup a sysfs device for a memory block | |
85 | */ | |
00a41db5 BP |
86 | static |
87 | int register_memory(struct memory_block *memory, struct mem_section *section) | |
3947be19 DH |
88 | { |
89 | int error; | |
90 | ||
91 | memory->sysdev.cls = &memory_sysdev_class; | |
92 | memory->sysdev.id = __section_nr(section); | |
93 | ||
94 | error = sysdev_register(&memory->sysdev); | |
3947be19 DH |
95 | return error; |
96 | } | |
97 | ||
98 | static void | |
00a41db5 | 99 | unregister_memory(struct memory_block *memory, struct mem_section *section) |
3947be19 DH |
100 | { |
101 | BUG_ON(memory->sysdev.cls != &memory_sysdev_class); | |
102 | BUG_ON(memory->sysdev.id != __section_nr(section)); | |
103 | ||
00a41db5 BP |
104 | /* drop the ref. we got in remove_memory_block() */ |
105 | kobject_put(&memory->sysdev.kobj); | |
3947be19 | 106 | sysdev_unregister(&memory->sysdev); |
3947be19 DH |
107 | } |
108 | ||
109 | /* | |
110 | * use this as the physical section index that this memsection | |
111 | * uses. | |
112 | */ | |
113 | ||
4a0b2b4d AK |
114 | static ssize_t show_mem_phys_index(struct sys_device *dev, |
115 | struct sysdev_attribute *attr, char *buf) | |
3947be19 DH |
116 | { |
117 | struct memory_block *mem = | |
118 | container_of(dev, struct memory_block, sysdev); | |
119 | return sprintf(buf, "%08lx\n", mem->phys_index); | |
120 | } | |
121 | ||
5c755e9f BP |
122 | /* |
123 | * Show whether the section of memory is likely to be hot-removable | |
124 | */ | |
1f07be1c SR |
125 | static ssize_t show_mem_removable(struct sys_device *dev, |
126 | struct sysdev_attribute *attr, char *buf) | |
5c755e9f BP |
127 | { |
128 | unsigned long start_pfn; | |
129 | int ret; | |
130 | struct memory_block *mem = | |
131 | container_of(dev, struct memory_block, sysdev); | |
132 | ||
133 | start_pfn = section_nr_to_pfn(mem->phys_index); | |
134 | ret = is_mem_section_removable(start_pfn, PAGES_PER_SECTION); | |
135 | return sprintf(buf, "%d\n", ret); | |
136 | } | |
137 | ||
3947be19 DH |
138 | /* |
139 | * online, offline, going offline, etc. | |
140 | */ | |
4a0b2b4d AK |
141 | static ssize_t show_mem_state(struct sys_device *dev, |
142 | struct sysdev_attribute *attr, char *buf) | |
3947be19 DH |
143 | { |
144 | struct memory_block *mem = | |
145 | container_of(dev, struct memory_block, sysdev); | |
146 | ssize_t len = 0; | |
147 | ||
148 | /* | |
149 | * We can probably put these states in a nice little array | |
150 | * so that they're not open-coded | |
151 | */ | |
152 | switch (mem->state) { | |
153 | case MEM_ONLINE: | |
154 | len = sprintf(buf, "online\n"); | |
155 | break; | |
156 | case MEM_OFFLINE: | |
157 | len = sprintf(buf, "offline\n"); | |
158 | break; | |
159 | case MEM_GOING_OFFLINE: | |
160 | len = sprintf(buf, "going-offline\n"); | |
161 | break; | |
162 | default: | |
163 | len = sprintf(buf, "ERROR-UNKNOWN-%ld\n", | |
164 | mem->state); | |
165 | WARN_ON(1); | |
166 | break; | |
167 | } | |
168 | ||
169 | return len; | |
170 | } | |
171 | ||
7b78d335 | 172 | int memory_notify(unsigned long val, void *v) |
3947be19 | 173 | { |
e041c683 | 174 | return blocking_notifier_call_chain(&memory_chain, val, v); |
3947be19 DH |
175 | } |
176 | ||
925cc71e RJ |
177 | int memory_isolate_notify(unsigned long val, void *v) |
178 | { | |
179 | return atomic_notifier_call_chain(&memory_isolate_chain, val, v); | |
180 | } | |
181 | ||
3947be19 DH |
182 | /* |
183 | * MEMORY_HOTPLUG depends on SPARSEMEM in mm/Kconfig, so it is | |
184 | * OK to have direct references to sparsemem variables in here. | |
185 | */ | |
186 | static int | |
187 | memory_block_action(struct memory_block *mem, unsigned long action) | |
188 | { | |
189 | int i; | |
190 | unsigned long psection; | |
191 | unsigned long start_pfn, start_paddr; | |
192 | struct page *first_page; | |
193 | int ret; | |
194 | int old_state = mem->state; | |
195 | ||
196 | psection = mem->phys_index; | |
197 | first_page = pfn_to_page(psection << PFN_SECTION_SHIFT); | |
198 | ||
199 | /* | |
200 | * The probe routines leave the pages reserved, just | |
201 | * as the bootmem code does. Make sure they're still | |
202 | * that way. | |
203 | */ | |
204 | if (action == MEM_ONLINE) { | |
205 | for (i = 0; i < PAGES_PER_SECTION; i++) { | |
206 | if (PageReserved(first_page+i)) | |
207 | continue; | |
208 | ||
209 | printk(KERN_WARNING "section number %ld page number %d " | |
210 | "not reserved, was it already online? \n", | |
211 | psection, i); | |
212 | return -EBUSY; | |
213 | } | |
214 | } | |
215 | ||
216 | switch (action) { | |
217 | case MEM_ONLINE: | |
218 | start_pfn = page_to_pfn(first_page); | |
219 | ret = online_pages(start_pfn, PAGES_PER_SECTION); | |
220 | break; | |
221 | case MEM_OFFLINE: | |
222 | mem->state = MEM_GOING_OFFLINE; | |
3947be19 DH |
223 | start_paddr = page_to_pfn(first_page) << PAGE_SHIFT; |
224 | ret = remove_memory(start_paddr, | |
225 | PAGES_PER_SECTION << PAGE_SHIFT); | |
226 | if (ret) { | |
227 | mem->state = old_state; | |
228 | break; | |
229 | } | |
3947be19 DH |
230 | break; |
231 | default: | |
f810a5cf | 232 | WARN(1, KERN_WARNING "%s(%p, %ld) unknown action: %ld\n", |
2b3a302a | 233 | __func__, mem, action, action); |
3947be19 DH |
234 | ret = -EINVAL; |
235 | } | |
3947be19 DH |
236 | |
237 | return ret; | |
238 | } | |
239 | ||
240 | static int memory_block_change_state(struct memory_block *mem, | |
241 | unsigned long to_state, unsigned long from_state_req) | |
242 | { | |
243 | int ret = 0; | |
da19cbcf | 244 | mutex_lock(&mem->state_mutex); |
3947be19 DH |
245 | |
246 | if (mem->state != from_state_req) { | |
247 | ret = -EINVAL; | |
248 | goto out; | |
249 | } | |
250 | ||
251 | ret = memory_block_action(mem, to_state); | |
252 | if (!ret) | |
253 | mem->state = to_state; | |
254 | ||
255 | out: | |
da19cbcf | 256 | mutex_unlock(&mem->state_mutex); |
3947be19 DH |
257 | return ret; |
258 | } | |
259 | ||
260 | static ssize_t | |
4a0b2b4d AK |
261 | store_mem_state(struct sys_device *dev, |
262 | struct sysdev_attribute *attr, const char *buf, size_t count) | |
3947be19 DH |
263 | { |
264 | struct memory_block *mem; | |
265 | unsigned int phys_section_nr; | |
266 | int ret = -EINVAL; | |
267 | ||
268 | mem = container_of(dev, struct memory_block, sysdev); | |
269 | phys_section_nr = mem->phys_index; | |
270 | ||
540557b9 | 271 | if (!present_section_nr(phys_section_nr)) |
3947be19 DH |
272 | goto out; |
273 | ||
274 | if (!strncmp(buf, "online", min((int)count, 6))) | |
275 | ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE); | |
276 | else if(!strncmp(buf, "offline", min((int)count, 7))) | |
277 | ret = memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE); | |
278 | out: | |
279 | if (ret) | |
280 | return ret; | |
281 | return count; | |
282 | } | |
283 | ||
284 | /* | |
285 | * phys_device is a bad name for this. What I really want | |
286 | * is a way to differentiate between memory ranges that | |
287 | * are part of physical devices that constitute | |
288 | * a complete removable unit or fru. | |
289 | * i.e. do these ranges belong to the same physical device, | |
290 | * s.t. if I offline all of these sections I can then | |
291 | * remove the physical device? | |
292 | */ | |
4a0b2b4d AK |
293 | static ssize_t show_phys_device(struct sys_device *dev, |
294 | struct sysdev_attribute *attr, char *buf) | |
3947be19 DH |
295 | { |
296 | struct memory_block *mem = | |
297 | container_of(dev, struct memory_block, sysdev); | |
298 | return sprintf(buf, "%d\n", mem->phys_device); | |
299 | } | |
300 | ||
301 | static SYSDEV_ATTR(phys_index, 0444, show_mem_phys_index, NULL); | |
302 | static SYSDEV_ATTR(state, 0644, show_mem_state, store_mem_state); | |
303 | static SYSDEV_ATTR(phys_device, 0444, show_phys_device, NULL); | |
5c755e9f | 304 | static SYSDEV_ATTR(removable, 0444, show_mem_removable, NULL); |
3947be19 DH |
305 | |
306 | #define mem_create_simple_file(mem, attr_name) \ | |
307 | sysdev_create_file(&mem->sysdev, &attr_##attr_name) | |
308 | #define mem_remove_simple_file(mem, attr_name) \ | |
309 | sysdev_remove_file(&mem->sysdev, &attr_##attr_name) | |
310 | ||
311 | /* | |
312 | * Block size attribute stuff | |
313 | */ | |
314 | static ssize_t | |
8564a6c1 AK |
315 | print_block_size(struct sysdev_class *class, struct sysdev_class_attribute *attr, |
316 | char *buf) | |
3947be19 | 317 | { |
4dc86ae1 | 318 | return sprintf(buf, "%lx\n", (unsigned long)PAGES_PER_SECTION * PAGE_SIZE); |
3947be19 DH |
319 | } |
320 | ||
8564a6c1 | 321 | static SYSDEV_CLASS_ATTR(block_size_bytes, 0444, print_block_size, NULL); |
3947be19 DH |
322 | |
323 | static int block_size_init(void) | |
324 | { | |
28ec24e2 | 325 | return sysfs_create_file(&memory_sysdev_class.kset.kobj, |
8564a6c1 | 326 | &attr_block_size_bytes.attr); |
3947be19 DH |
327 | } |
328 | ||
329 | /* | |
330 | * Some architectures will have custom drivers to do this, and | |
331 | * will not need to do it from userspace. The fake hot-add code | |
332 | * as well as ppc64 will do all of their discovery in userspace | |
333 | * and will require this interface. | |
334 | */ | |
335 | #ifdef CONFIG_ARCH_MEMORY_PROBE | |
336 | static ssize_t | |
28812fe1 AK |
337 | memory_probe_store(struct class *class, struct class_attribute *attr, |
338 | const char *buf, size_t count) | |
3947be19 DH |
339 | { |
340 | u64 phys_addr; | |
bc02af93 | 341 | int nid; |
3947be19 DH |
342 | int ret; |
343 | ||
344 | phys_addr = simple_strtoull(buf, NULL, 0); | |
345 | ||
bc02af93 YG |
346 | nid = memory_add_physaddr_to_nid(phys_addr); |
347 | ret = add_memory(nid, phys_addr, PAGES_PER_SECTION << PAGE_SHIFT); | |
3947be19 DH |
348 | |
349 | if (ret) | |
350 | count = ret; | |
351 | ||
352 | return count; | |
353 | } | |
bd796671 | 354 | static CLASS_ATTR(probe, S_IWUSR, NULL, memory_probe_store); |
3947be19 DH |
355 | |
356 | static int memory_probe_init(void) | |
357 | { | |
28ec24e2 | 358 | return sysfs_create_file(&memory_sysdev_class.kset.kobj, |
bd796671 | 359 | &class_attr_probe.attr); |
3947be19 DH |
360 | } |
361 | #else | |
28ec24e2 AM |
362 | static inline int memory_probe_init(void) |
363 | { | |
364 | return 0; | |
365 | } | |
3947be19 DH |
366 | #endif |
367 | ||
facb6011 AK |
368 | #ifdef CONFIG_MEMORY_FAILURE |
369 | /* | |
370 | * Support for offlining pages of memory | |
371 | */ | |
372 | ||
373 | /* Soft offline a page */ | |
374 | static ssize_t | |
28812fe1 AK |
375 | store_soft_offline_page(struct class *class, |
376 | struct class_attribute *attr, | |
377 | const char *buf, size_t count) | |
facb6011 AK |
378 | { |
379 | int ret; | |
380 | u64 pfn; | |
381 | if (!capable(CAP_SYS_ADMIN)) | |
382 | return -EPERM; | |
383 | if (strict_strtoull(buf, 0, &pfn) < 0) | |
384 | return -EINVAL; | |
385 | pfn >>= PAGE_SHIFT; | |
386 | if (!pfn_valid(pfn)) | |
387 | return -ENXIO; | |
388 | ret = soft_offline_page(pfn_to_page(pfn), 0); | |
389 | return ret == 0 ? count : ret; | |
390 | } | |
391 | ||
392 | /* Forcibly offline a page, including killing processes. */ | |
393 | static ssize_t | |
28812fe1 AK |
394 | store_hard_offline_page(struct class *class, |
395 | struct class_attribute *attr, | |
396 | const char *buf, size_t count) | |
facb6011 AK |
397 | { |
398 | int ret; | |
399 | u64 pfn; | |
400 | if (!capable(CAP_SYS_ADMIN)) | |
401 | return -EPERM; | |
402 | if (strict_strtoull(buf, 0, &pfn) < 0) | |
403 | return -EINVAL; | |
404 | pfn >>= PAGE_SHIFT; | |
405 | ret = __memory_failure(pfn, 0, 0); | |
406 | return ret ? ret : count; | |
407 | } | |
408 | ||
bd796671 GKH |
409 | static CLASS_ATTR(soft_offline_page, 0644, NULL, store_soft_offline_page); |
410 | static CLASS_ATTR(hard_offline_page, 0644, NULL, store_hard_offline_page); | |
facb6011 AK |
411 | |
412 | static __init int memory_fail_init(void) | |
413 | { | |
414 | int err; | |
415 | ||
416 | err = sysfs_create_file(&memory_sysdev_class.kset.kobj, | |
bd796671 | 417 | &class_attr_soft_offline_page.attr); |
facb6011 AK |
418 | if (!err) |
419 | err = sysfs_create_file(&memory_sysdev_class.kset.kobj, | |
bd796671 | 420 | &class_attr_hard_offline_page.attr); |
facb6011 AK |
421 | return err; |
422 | } | |
423 | #else | |
424 | static inline int memory_fail_init(void) | |
425 | { | |
426 | return 0; | |
427 | } | |
428 | #endif | |
429 | ||
3947be19 DH |
430 | /* |
431 | * Note that phys_device is optional. It is here to allow for | |
432 | * differentiation between which *physical* devices each | |
433 | * section belongs to... | |
434 | */ | |
bc32df00 HC |
435 | int __weak arch_get_memory_phys_device(unsigned long start_pfn) |
436 | { | |
437 | return 0; | |
438 | } | |
3947be19 | 439 | |
98383031 RH |
440 | struct memory_block *find_memory_block_hinted(struct mem_section *section, |
441 | struct memory_block *hint) | |
3947be19 DH |
442 | { |
443 | struct kobject *kobj; | |
444 | struct sys_device *sysdev; | |
445 | struct memory_block *mem; | |
446 | char name[sizeof(MEMORY_CLASS_NAME) + 9 + 1]; | |
447 | ||
98383031 RH |
448 | kobj = hint ? &hint->sysdev.kobj : NULL; |
449 | ||
3947be19 DH |
450 | /* |
451 | * This only works because we know that section == sysdev->id | |
452 | * slightly redundant with sysdev_register() | |
453 | */ | |
454 | sprintf(&name[0], "%s%d", MEMORY_CLASS_NAME, __section_nr(section)); | |
455 | ||
98383031 | 456 | kobj = kset_find_obj_hinted(&memory_sysdev_class.kset, name, kobj); |
3947be19 DH |
457 | if (!kobj) |
458 | return NULL; | |
459 | ||
460 | sysdev = container_of(kobj, struct sys_device, kobj); | |
461 | mem = container_of(sysdev, struct memory_block, sysdev); | |
462 | ||
463 | return mem; | |
464 | } | |
465 | ||
98383031 RH |
466 | /* |
467 | * For now, we have a linear search to go find the appropriate | |
468 | * memory_block corresponding to a particular phys_index. If | |
469 | * this gets to be a real problem, we can always use a radix | |
470 | * tree or something here. | |
471 | * | |
472 | * This could be made generic for all sysdev classes. | |
473 | */ | |
474 | struct memory_block *find_memory_block(struct mem_section *section) | |
475 | { | |
476 | return find_memory_block_hinted(section, NULL); | |
477 | } | |
478 | ||
e4619c85 NF |
479 | static int add_memory_block(int nid, struct mem_section *section, |
480 | unsigned long state, enum mem_add_context context) | |
481 | { | |
482 | struct memory_block *mem = kzalloc(sizeof(*mem), GFP_KERNEL); | |
483 | unsigned long start_pfn; | |
484 | int ret = 0; | |
485 | ||
486 | if (!mem) | |
487 | return -ENOMEM; | |
488 | ||
2938ffbd NF |
489 | mutex_lock(&mem_sysfs_mutex); |
490 | ||
e4619c85 NF |
491 | mem->phys_index = __section_nr(section); |
492 | mem->state = state; | |
07681215 | 493 | mem->section_count++; |
e4619c85 NF |
494 | mutex_init(&mem->state_mutex); |
495 | start_pfn = section_nr_to_pfn(mem->phys_index); | |
496 | mem->phys_device = arch_get_memory_phys_device(start_pfn); | |
497 | ||
498 | ret = register_memory(mem, section); | |
499 | if (!ret) | |
500 | ret = mem_create_simple_file(mem, phys_index); | |
501 | if (!ret) | |
502 | ret = mem_create_simple_file(mem, state); | |
503 | if (!ret) | |
504 | ret = mem_create_simple_file(mem, phys_device); | |
505 | if (!ret) | |
506 | ret = mem_create_simple_file(mem, removable); | |
507 | if (!ret) { | |
508 | if (context == HOTPLUG) | |
509 | ret = register_mem_sect_under_node(mem, nid); | |
510 | } | |
511 | ||
2938ffbd | 512 | mutex_unlock(&mem_sysfs_mutex); |
e4619c85 NF |
513 | return ret; |
514 | } | |
515 | ||
3947be19 DH |
516 | int remove_memory_block(unsigned long node_id, struct mem_section *section, |
517 | int phys_device) | |
518 | { | |
519 | struct memory_block *mem; | |
520 | ||
2938ffbd | 521 | mutex_lock(&mem_sysfs_mutex); |
3947be19 | 522 | mem = find_memory_block(section); |
07681215 NF |
523 | |
524 | mem->section_count--; | |
525 | if (mem->section_count == 0) { | |
526 | unregister_mem_sect_under_nodes(mem); | |
527 | mem_remove_simple_file(mem, phys_index); | |
528 | mem_remove_simple_file(mem, state); | |
529 | mem_remove_simple_file(mem, phys_device); | |
530 | mem_remove_simple_file(mem, removable); | |
531 | unregister_memory(mem, section); | |
532 | } | |
3947be19 | 533 | |
2938ffbd | 534 | mutex_unlock(&mem_sysfs_mutex); |
3947be19 DH |
535 | return 0; |
536 | } | |
537 | ||
538 | /* | |
539 | * need an interface for the VM to add new memory regions, | |
540 | * but without onlining it. | |
541 | */ | |
c04fc586 | 542 | int register_new_memory(int nid, struct mem_section *section) |
3947be19 | 543 | { |
bc32df00 | 544 | return add_memory_block(nid, section, MEM_OFFLINE, HOTPLUG); |
3947be19 DH |
545 | } |
546 | ||
547 | int unregister_memory_section(struct mem_section *section) | |
548 | { | |
540557b9 | 549 | if (!present_section(section)) |
3947be19 DH |
550 | return -EINVAL; |
551 | ||
552 | return remove_memory_block(0, section, 0); | |
553 | } | |
554 | ||
555 | /* | |
556 | * Initialize the sysfs support for memory devices... | |
557 | */ | |
558 | int __init memory_dev_init(void) | |
559 | { | |
560 | unsigned int i; | |
561 | int ret; | |
28ec24e2 | 562 | int err; |
3947be19 | 563 | |
312c004d | 564 | memory_sysdev_class.kset.uevent_ops = &memory_uevent_ops; |
3947be19 | 565 | ret = sysdev_class_register(&memory_sysdev_class); |
28ec24e2 AM |
566 | if (ret) |
567 | goto out; | |
3947be19 DH |
568 | |
569 | /* | |
570 | * Create entries for memory sections that were found | |
571 | * during boot and have been initialized | |
572 | */ | |
573 | for (i = 0; i < NR_MEM_SECTIONS; i++) { | |
540557b9 | 574 | if (!present_section_nr(i)) |
3947be19 | 575 | continue; |
c04fc586 | 576 | err = add_memory_block(0, __nr_to_section(i), MEM_ONLINE, |
bc32df00 | 577 | BOOT); |
28ec24e2 AM |
578 | if (!ret) |
579 | ret = err; | |
3947be19 DH |
580 | } |
581 | ||
28ec24e2 | 582 | err = memory_probe_init(); |
facb6011 AK |
583 | if (!ret) |
584 | ret = err; | |
585 | err = memory_fail_init(); | |
28ec24e2 AM |
586 | if (!ret) |
587 | ret = err; | |
588 | err = block_size_init(); | |
589 | if (!ret) | |
590 | ret = err; | |
591 | out: | |
592 | if (ret) | |
2b3a302a | 593 | printk(KERN_ERR "%s() failed: %d\n", __func__, ret); |
3947be19 DH |
594 | return ret; |
595 | } |