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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 | 32 | #define MEMORY_CLASS_NAME "memory" |
0c2c99b1 NF |
33 | #define MIN_MEMORY_BLOCK_SIZE (1 << SECTION_SIZE_BITS) |
34 | ||
35 | static int sections_per_block; | |
36 | ||
37 | static inline int base_memory_block_id(int section_nr) | |
38 | { | |
39 | return section_nr / sections_per_block; | |
40 | } | |
3947be19 DH |
41 | |
42 | static struct sysdev_class memory_sysdev_class = { | |
af5ca3f4 | 43 | .name = MEMORY_CLASS_NAME, |
3947be19 | 44 | }; |
3947be19 | 45 | |
312c004d | 46 | static const char *memory_uevent_name(struct kset *kset, struct kobject *kobj) |
3947be19 DH |
47 | { |
48 | return MEMORY_CLASS_NAME; | |
49 | } | |
50 | ||
9ec0fd4e | 51 | static int memory_uevent(struct kset *kset, struct kobject *obj, struct kobj_uevent_env *env) |
3947be19 DH |
52 | { |
53 | int retval = 0; | |
54 | ||
55 | return retval; | |
56 | } | |
57 | ||
9cd43611 | 58 | static const struct kset_uevent_ops memory_uevent_ops = { |
312c004d KS |
59 | .name = memory_uevent_name, |
60 | .uevent = memory_uevent, | |
3947be19 DH |
61 | }; |
62 | ||
e041c683 | 63 | static BLOCKING_NOTIFIER_HEAD(memory_chain); |
3947be19 | 64 | |
98a38ebd | 65 | int register_memory_notifier(struct notifier_block *nb) |
3947be19 | 66 | { |
e041c683 | 67 | return blocking_notifier_chain_register(&memory_chain, nb); |
3947be19 | 68 | } |
3c82c30c | 69 | EXPORT_SYMBOL(register_memory_notifier); |
3947be19 | 70 | |
98a38ebd | 71 | void unregister_memory_notifier(struct notifier_block *nb) |
3947be19 | 72 | { |
e041c683 | 73 | blocking_notifier_chain_unregister(&memory_chain, nb); |
3947be19 | 74 | } |
3c82c30c | 75 | EXPORT_SYMBOL(unregister_memory_notifier); |
3947be19 | 76 | |
925cc71e RJ |
77 | static ATOMIC_NOTIFIER_HEAD(memory_isolate_chain); |
78 | ||
79 | int register_memory_isolate_notifier(struct notifier_block *nb) | |
80 | { | |
81 | return atomic_notifier_chain_register(&memory_isolate_chain, nb); | |
82 | } | |
83 | EXPORT_SYMBOL(register_memory_isolate_notifier); | |
84 | ||
85 | void unregister_memory_isolate_notifier(struct notifier_block *nb) | |
86 | { | |
87 | atomic_notifier_chain_unregister(&memory_isolate_chain, nb); | |
88 | } | |
89 | EXPORT_SYMBOL(unregister_memory_isolate_notifier); | |
90 | ||
3947be19 DH |
91 | /* |
92 | * register_memory - Setup a sysfs device for a memory block | |
93 | */ | |
00a41db5 | 94 | static |
0c2c99b1 | 95 | int register_memory(struct memory_block *memory) |
3947be19 DH |
96 | { |
97 | int error; | |
98 | ||
99 | memory->sysdev.cls = &memory_sysdev_class; | |
d3360164 | 100 | memory->sysdev.id = memory->start_section_nr / sections_per_block; |
3947be19 DH |
101 | |
102 | error = sysdev_register(&memory->sysdev); | |
3947be19 DH |
103 | return error; |
104 | } | |
105 | ||
106 | static void | |
0c2c99b1 | 107 | unregister_memory(struct memory_block *memory) |
3947be19 DH |
108 | { |
109 | BUG_ON(memory->sysdev.cls != &memory_sysdev_class); | |
3947be19 | 110 | |
00a41db5 BP |
111 | /* drop the ref. we got in remove_memory_block() */ |
112 | kobject_put(&memory->sysdev.kobj); | |
3947be19 | 113 | sysdev_unregister(&memory->sysdev); |
3947be19 DH |
114 | } |
115 | ||
0c2c99b1 NF |
116 | unsigned long __weak memory_block_size_bytes(void) |
117 | { | |
118 | return MIN_MEMORY_BLOCK_SIZE; | |
119 | } | |
120 | ||
121 | static unsigned long get_memory_block_size(void) | |
122 | { | |
123 | unsigned long block_sz; | |
124 | ||
125 | block_sz = memory_block_size_bytes(); | |
126 | ||
127 | /* Validate blk_sz is a power of 2 and not less than section size */ | |
128 | if ((block_sz & (block_sz - 1)) || (block_sz < MIN_MEMORY_BLOCK_SIZE)) { | |
129 | WARN_ON(1); | |
130 | block_sz = MIN_MEMORY_BLOCK_SIZE; | |
131 | } | |
132 | ||
133 | return block_sz; | |
134 | } | |
135 | ||
3947be19 DH |
136 | /* |
137 | * use this as the physical section index that this memsection | |
138 | * uses. | |
139 | */ | |
140 | ||
d3360164 | 141 | static ssize_t show_mem_start_phys_index(struct sys_device *dev, |
4a0b2b4d | 142 | struct sysdev_attribute *attr, char *buf) |
3947be19 DH |
143 | { |
144 | struct memory_block *mem = | |
145 | container_of(dev, struct memory_block, sysdev); | |
d3360164 NF |
146 | unsigned long phys_index; |
147 | ||
148 | phys_index = mem->start_section_nr / sections_per_block; | |
149 | return sprintf(buf, "%08lx\n", phys_index); | |
150 | } | |
151 | ||
152 | static ssize_t show_mem_end_phys_index(struct sys_device *dev, | |
153 | struct sysdev_attribute *attr, char *buf) | |
154 | { | |
155 | struct memory_block *mem = | |
156 | container_of(dev, struct memory_block, sysdev); | |
157 | unsigned long phys_index; | |
158 | ||
159 | phys_index = mem->end_section_nr / sections_per_block; | |
160 | return sprintf(buf, "%08lx\n", phys_index); | |
3947be19 DH |
161 | } |
162 | ||
5c755e9f BP |
163 | /* |
164 | * Show whether the section of memory is likely to be hot-removable | |
165 | */ | |
1f07be1c SR |
166 | static ssize_t show_mem_removable(struct sys_device *dev, |
167 | struct sysdev_attribute *attr, char *buf) | |
5c755e9f | 168 | { |
0c2c99b1 NF |
169 | unsigned long i, pfn; |
170 | int ret = 1; | |
5c755e9f BP |
171 | struct memory_block *mem = |
172 | container_of(dev, struct memory_block, sysdev); | |
173 | ||
0c2c99b1 | 174 | for (i = 0; i < sections_per_block; i++) { |
d3360164 | 175 | pfn = section_nr_to_pfn(mem->start_section_nr + i); |
0c2c99b1 NF |
176 | ret &= is_mem_section_removable(pfn, PAGES_PER_SECTION); |
177 | } | |
178 | ||
5c755e9f BP |
179 | return sprintf(buf, "%d\n", ret); |
180 | } | |
181 | ||
3947be19 DH |
182 | /* |
183 | * online, offline, going offline, etc. | |
184 | */ | |
4a0b2b4d AK |
185 | static ssize_t show_mem_state(struct sys_device *dev, |
186 | struct sysdev_attribute *attr, char *buf) | |
3947be19 DH |
187 | { |
188 | struct memory_block *mem = | |
189 | container_of(dev, struct memory_block, sysdev); | |
190 | ssize_t len = 0; | |
191 | ||
192 | /* | |
193 | * We can probably put these states in a nice little array | |
194 | * so that they're not open-coded | |
195 | */ | |
196 | switch (mem->state) { | |
197 | case MEM_ONLINE: | |
198 | len = sprintf(buf, "online\n"); | |
199 | break; | |
200 | case MEM_OFFLINE: | |
201 | len = sprintf(buf, "offline\n"); | |
202 | break; | |
203 | case MEM_GOING_OFFLINE: | |
204 | len = sprintf(buf, "going-offline\n"); | |
205 | break; | |
206 | default: | |
207 | len = sprintf(buf, "ERROR-UNKNOWN-%ld\n", | |
208 | mem->state); | |
209 | WARN_ON(1); | |
210 | break; | |
211 | } | |
212 | ||
213 | return len; | |
214 | } | |
215 | ||
7b78d335 | 216 | int memory_notify(unsigned long val, void *v) |
3947be19 | 217 | { |
e041c683 | 218 | return blocking_notifier_call_chain(&memory_chain, val, v); |
3947be19 DH |
219 | } |
220 | ||
925cc71e RJ |
221 | int memory_isolate_notify(unsigned long val, void *v) |
222 | { | |
223 | return atomic_notifier_call_chain(&memory_isolate_chain, val, v); | |
224 | } | |
225 | ||
3947be19 DH |
226 | /* |
227 | * MEMORY_HOTPLUG depends on SPARSEMEM in mm/Kconfig, so it is | |
228 | * OK to have direct references to sparsemem variables in here. | |
229 | */ | |
230 | static int | |
0c2c99b1 | 231 | memory_section_action(unsigned long phys_index, unsigned long action) |
3947be19 DH |
232 | { |
233 | int i; | |
3947be19 DH |
234 | unsigned long start_pfn, start_paddr; |
235 | struct page *first_page; | |
236 | int ret; | |
3947be19 | 237 | |
0c2c99b1 | 238 | first_page = pfn_to_page(phys_index << PFN_SECTION_SHIFT); |
3947be19 DH |
239 | |
240 | /* | |
241 | * The probe routines leave the pages reserved, just | |
242 | * as the bootmem code does. Make sure they're still | |
243 | * that way. | |
244 | */ | |
245 | if (action == MEM_ONLINE) { | |
246 | for (i = 0; i < PAGES_PER_SECTION; i++) { | |
247 | if (PageReserved(first_page+i)) | |
248 | continue; | |
249 | ||
250 | printk(KERN_WARNING "section number %ld page number %d " | |
0c2c99b1 NF |
251 | "not reserved, was it already online?\n", |
252 | phys_index, i); | |
3947be19 DH |
253 | return -EBUSY; |
254 | } | |
255 | } | |
256 | ||
257 | switch (action) { | |
258 | case MEM_ONLINE: | |
259 | start_pfn = page_to_pfn(first_page); | |
260 | ret = online_pages(start_pfn, PAGES_PER_SECTION); | |
261 | break; | |
262 | case MEM_OFFLINE: | |
3947be19 DH |
263 | start_paddr = page_to_pfn(first_page) << PAGE_SHIFT; |
264 | ret = remove_memory(start_paddr, | |
265 | PAGES_PER_SECTION << PAGE_SHIFT); | |
3947be19 DH |
266 | break; |
267 | default: | |
0c2c99b1 NF |
268 | WARN(1, KERN_WARNING "%s(%ld, %ld) unknown action: " |
269 | "%ld\n", __func__, phys_index, action, action); | |
3947be19 DH |
270 | ret = -EINVAL; |
271 | } | |
3947be19 DH |
272 | |
273 | return ret; | |
274 | } | |
275 | ||
276 | static int memory_block_change_state(struct memory_block *mem, | |
277 | unsigned long to_state, unsigned long from_state_req) | |
278 | { | |
0c2c99b1 NF |
279 | int i, ret = 0; |
280 | ||
da19cbcf | 281 | mutex_lock(&mem->state_mutex); |
3947be19 DH |
282 | |
283 | if (mem->state != from_state_req) { | |
284 | ret = -EINVAL; | |
285 | goto out; | |
286 | } | |
287 | ||
0c2c99b1 NF |
288 | if (to_state == MEM_OFFLINE) |
289 | mem->state = MEM_GOING_OFFLINE; | |
290 | ||
291 | for (i = 0; i < sections_per_block; i++) { | |
d3360164 NF |
292 | ret = memory_section_action(mem->start_section_nr + i, |
293 | to_state); | |
0c2c99b1 NF |
294 | if (ret) |
295 | break; | |
296 | } | |
297 | ||
298 | if (ret) { | |
299 | for (i = 0; i < sections_per_block; i++) | |
d3360164 | 300 | memory_section_action(mem->start_section_nr + i, |
0c2c99b1 NF |
301 | from_state_req); |
302 | ||
303 | mem->state = from_state_req; | |
304 | } else | |
3947be19 DH |
305 | mem->state = to_state; |
306 | ||
307 | out: | |
da19cbcf | 308 | mutex_unlock(&mem->state_mutex); |
3947be19 DH |
309 | return ret; |
310 | } | |
311 | ||
312 | static ssize_t | |
4a0b2b4d AK |
313 | store_mem_state(struct sys_device *dev, |
314 | struct sysdev_attribute *attr, const char *buf, size_t count) | |
3947be19 DH |
315 | { |
316 | struct memory_block *mem; | |
3947be19 DH |
317 | int ret = -EINVAL; |
318 | ||
319 | mem = container_of(dev, struct memory_block, sysdev); | |
3947be19 DH |
320 | |
321 | if (!strncmp(buf, "online", min((int)count, 6))) | |
322 | ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE); | |
323 | else if(!strncmp(buf, "offline", min((int)count, 7))) | |
324 | ret = memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE); | |
0c2c99b1 | 325 | |
3947be19 DH |
326 | if (ret) |
327 | return ret; | |
328 | return count; | |
329 | } | |
330 | ||
331 | /* | |
332 | * phys_device is a bad name for this. What I really want | |
333 | * is a way to differentiate between memory ranges that | |
334 | * are part of physical devices that constitute | |
335 | * a complete removable unit or fru. | |
336 | * i.e. do these ranges belong to the same physical device, | |
337 | * s.t. if I offline all of these sections I can then | |
338 | * remove the physical device? | |
339 | */ | |
4a0b2b4d AK |
340 | static ssize_t show_phys_device(struct sys_device *dev, |
341 | struct sysdev_attribute *attr, char *buf) | |
3947be19 DH |
342 | { |
343 | struct memory_block *mem = | |
344 | container_of(dev, struct memory_block, sysdev); | |
345 | return sprintf(buf, "%d\n", mem->phys_device); | |
346 | } | |
347 | ||
d3360164 NF |
348 | static SYSDEV_ATTR(phys_index, 0444, show_mem_start_phys_index, NULL); |
349 | static SYSDEV_ATTR(end_phys_index, 0444, show_mem_end_phys_index, NULL); | |
3947be19 DH |
350 | static SYSDEV_ATTR(state, 0644, show_mem_state, store_mem_state); |
351 | static SYSDEV_ATTR(phys_device, 0444, show_phys_device, NULL); | |
5c755e9f | 352 | static SYSDEV_ATTR(removable, 0444, show_mem_removable, NULL); |
3947be19 DH |
353 | |
354 | #define mem_create_simple_file(mem, attr_name) \ | |
355 | sysdev_create_file(&mem->sysdev, &attr_##attr_name) | |
356 | #define mem_remove_simple_file(mem, attr_name) \ | |
357 | sysdev_remove_file(&mem->sysdev, &attr_##attr_name) | |
358 | ||
359 | /* | |
360 | * Block size attribute stuff | |
361 | */ | |
362 | static ssize_t | |
8564a6c1 AK |
363 | print_block_size(struct sysdev_class *class, struct sysdev_class_attribute *attr, |
364 | char *buf) | |
3947be19 | 365 | { |
0c2c99b1 | 366 | return sprintf(buf, "%lx\n", get_memory_block_size()); |
3947be19 DH |
367 | } |
368 | ||
8564a6c1 | 369 | static SYSDEV_CLASS_ATTR(block_size_bytes, 0444, print_block_size, NULL); |
3947be19 DH |
370 | |
371 | static int block_size_init(void) | |
372 | { | |
28ec24e2 | 373 | return sysfs_create_file(&memory_sysdev_class.kset.kobj, |
8564a6c1 | 374 | &attr_block_size_bytes.attr); |
3947be19 DH |
375 | } |
376 | ||
377 | /* | |
378 | * Some architectures will have custom drivers to do this, and | |
379 | * will not need to do it from userspace. The fake hot-add code | |
380 | * as well as ppc64 will do all of their discovery in userspace | |
381 | * and will require this interface. | |
382 | */ | |
383 | #ifdef CONFIG_ARCH_MEMORY_PROBE | |
384 | static ssize_t | |
28812fe1 AK |
385 | memory_probe_store(struct class *class, struct class_attribute *attr, |
386 | const char *buf, size_t count) | |
3947be19 DH |
387 | { |
388 | u64 phys_addr; | |
bc02af93 | 389 | int nid; |
3947be19 DH |
390 | int ret; |
391 | ||
392 | phys_addr = simple_strtoull(buf, NULL, 0); | |
393 | ||
bc02af93 YG |
394 | nid = memory_add_physaddr_to_nid(phys_addr); |
395 | ret = add_memory(nid, phys_addr, PAGES_PER_SECTION << PAGE_SHIFT); | |
3947be19 DH |
396 | |
397 | if (ret) | |
398 | count = ret; | |
399 | ||
400 | return count; | |
401 | } | |
bd796671 | 402 | static CLASS_ATTR(probe, S_IWUSR, NULL, memory_probe_store); |
3947be19 DH |
403 | |
404 | static int memory_probe_init(void) | |
405 | { | |
28ec24e2 | 406 | return sysfs_create_file(&memory_sysdev_class.kset.kobj, |
bd796671 | 407 | &class_attr_probe.attr); |
3947be19 DH |
408 | } |
409 | #else | |
28ec24e2 AM |
410 | static inline int memory_probe_init(void) |
411 | { | |
412 | return 0; | |
413 | } | |
3947be19 DH |
414 | #endif |
415 | ||
facb6011 AK |
416 | #ifdef CONFIG_MEMORY_FAILURE |
417 | /* | |
418 | * Support for offlining pages of memory | |
419 | */ | |
420 | ||
421 | /* Soft offline a page */ | |
422 | static ssize_t | |
28812fe1 AK |
423 | store_soft_offline_page(struct class *class, |
424 | struct class_attribute *attr, | |
425 | const char *buf, size_t count) | |
facb6011 AK |
426 | { |
427 | int ret; | |
428 | u64 pfn; | |
429 | if (!capable(CAP_SYS_ADMIN)) | |
430 | return -EPERM; | |
431 | if (strict_strtoull(buf, 0, &pfn) < 0) | |
432 | return -EINVAL; | |
433 | pfn >>= PAGE_SHIFT; | |
434 | if (!pfn_valid(pfn)) | |
435 | return -ENXIO; | |
436 | ret = soft_offline_page(pfn_to_page(pfn), 0); | |
437 | return ret == 0 ? count : ret; | |
438 | } | |
439 | ||
440 | /* Forcibly offline a page, including killing processes. */ | |
441 | static ssize_t | |
28812fe1 AK |
442 | store_hard_offline_page(struct class *class, |
443 | struct class_attribute *attr, | |
444 | const char *buf, size_t count) | |
facb6011 AK |
445 | { |
446 | int ret; | |
447 | u64 pfn; | |
448 | if (!capable(CAP_SYS_ADMIN)) | |
449 | return -EPERM; | |
450 | if (strict_strtoull(buf, 0, &pfn) < 0) | |
451 | return -EINVAL; | |
452 | pfn >>= PAGE_SHIFT; | |
453 | ret = __memory_failure(pfn, 0, 0); | |
454 | return ret ? ret : count; | |
455 | } | |
456 | ||
bd796671 GKH |
457 | static CLASS_ATTR(soft_offline_page, 0644, NULL, store_soft_offline_page); |
458 | static CLASS_ATTR(hard_offline_page, 0644, NULL, store_hard_offline_page); | |
facb6011 AK |
459 | |
460 | static __init int memory_fail_init(void) | |
461 | { | |
462 | int err; | |
463 | ||
464 | err = sysfs_create_file(&memory_sysdev_class.kset.kobj, | |
bd796671 | 465 | &class_attr_soft_offline_page.attr); |
facb6011 AK |
466 | if (!err) |
467 | err = sysfs_create_file(&memory_sysdev_class.kset.kobj, | |
bd796671 | 468 | &class_attr_hard_offline_page.attr); |
facb6011 AK |
469 | return err; |
470 | } | |
471 | #else | |
472 | static inline int memory_fail_init(void) | |
473 | { | |
474 | return 0; | |
475 | } | |
476 | #endif | |
477 | ||
3947be19 DH |
478 | /* |
479 | * Note that phys_device is optional. It is here to allow for | |
480 | * differentiation between which *physical* devices each | |
481 | * section belongs to... | |
482 | */ | |
bc32df00 HC |
483 | int __weak arch_get_memory_phys_device(unsigned long start_pfn) |
484 | { | |
485 | return 0; | |
486 | } | |
3947be19 | 487 | |
98383031 RH |
488 | struct memory_block *find_memory_block_hinted(struct mem_section *section, |
489 | struct memory_block *hint) | |
3947be19 DH |
490 | { |
491 | struct kobject *kobj; | |
492 | struct sys_device *sysdev; | |
493 | struct memory_block *mem; | |
494 | char name[sizeof(MEMORY_CLASS_NAME) + 9 + 1]; | |
0c2c99b1 | 495 | int block_id = base_memory_block_id(__section_nr(section)); |
3947be19 | 496 | |
98383031 RH |
497 | kobj = hint ? &hint->sysdev.kobj : NULL; |
498 | ||
3947be19 DH |
499 | /* |
500 | * This only works because we know that section == sysdev->id | |
501 | * slightly redundant with sysdev_register() | |
502 | */ | |
0c2c99b1 | 503 | sprintf(&name[0], "%s%d", MEMORY_CLASS_NAME, block_id); |
3947be19 | 504 | |
98383031 | 505 | kobj = kset_find_obj_hinted(&memory_sysdev_class.kset, name, kobj); |
3947be19 DH |
506 | if (!kobj) |
507 | return NULL; | |
508 | ||
509 | sysdev = container_of(kobj, struct sys_device, kobj); | |
510 | mem = container_of(sysdev, struct memory_block, sysdev); | |
511 | ||
512 | return mem; | |
513 | } | |
514 | ||
98383031 RH |
515 | /* |
516 | * For now, we have a linear search to go find the appropriate | |
517 | * memory_block corresponding to a particular phys_index. If | |
518 | * this gets to be a real problem, we can always use a radix | |
519 | * tree or something here. | |
520 | * | |
521 | * This could be made generic for all sysdev classes. | |
522 | */ | |
523 | struct memory_block *find_memory_block(struct mem_section *section) | |
524 | { | |
525 | return find_memory_block_hinted(section, NULL); | |
526 | } | |
527 | ||
0c2c99b1 NF |
528 | static int init_memory_block(struct memory_block **memory, |
529 | struct mem_section *section, unsigned long state) | |
e4619c85 | 530 | { |
0c2c99b1 | 531 | struct memory_block *mem; |
e4619c85 | 532 | unsigned long start_pfn; |
0c2c99b1 | 533 | int scn_nr; |
e4619c85 NF |
534 | int ret = 0; |
535 | ||
0c2c99b1 | 536 | mem = kzalloc(sizeof(*mem), GFP_KERNEL); |
e4619c85 NF |
537 | if (!mem) |
538 | return -ENOMEM; | |
539 | ||
0c2c99b1 | 540 | scn_nr = __section_nr(section); |
d3360164 NF |
541 | mem->start_section_nr = |
542 | base_memory_block_id(scn_nr) * sections_per_block; | |
543 | mem->end_section_nr = mem->start_section_nr + sections_per_block - 1; | |
e4619c85 | 544 | mem->state = state; |
07681215 | 545 | mem->section_count++; |
e4619c85 | 546 | mutex_init(&mem->state_mutex); |
d3360164 | 547 | start_pfn = section_nr_to_pfn(mem->start_section_nr); |
e4619c85 NF |
548 | mem->phys_device = arch_get_memory_phys_device(start_pfn); |
549 | ||
0c2c99b1 | 550 | ret = register_memory(mem); |
e4619c85 NF |
551 | if (!ret) |
552 | ret = mem_create_simple_file(mem, phys_index); | |
d3360164 NF |
553 | if (!ret) |
554 | ret = mem_create_simple_file(mem, end_phys_index); | |
e4619c85 NF |
555 | if (!ret) |
556 | ret = mem_create_simple_file(mem, state); | |
557 | if (!ret) | |
558 | ret = mem_create_simple_file(mem, phys_device); | |
559 | if (!ret) | |
560 | ret = mem_create_simple_file(mem, removable); | |
0c2c99b1 NF |
561 | |
562 | *memory = mem; | |
563 | return ret; | |
564 | } | |
565 | ||
566 | static int add_memory_section(int nid, struct mem_section *section, | |
567 | unsigned long state, enum mem_add_context context) | |
568 | { | |
569 | struct memory_block *mem; | |
570 | int ret = 0; | |
571 | ||
572 | mutex_lock(&mem_sysfs_mutex); | |
573 | ||
574 | mem = find_memory_block(section); | |
575 | if (mem) { | |
576 | mem->section_count++; | |
577 | kobject_put(&mem->sysdev.kobj); | |
578 | } else | |
579 | ret = init_memory_block(&mem, section, state); | |
580 | ||
e4619c85 | 581 | if (!ret) { |
0c2c99b1 NF |
582 | if (context == HOTPLUG && |
583 | mem->section_count == sections_per_block) | |
e4619c85 NF |
584 | ret = register_mem_sect_under_node(mem, nid); |
585 | } | |
586 | ||
2938ffbd | 587 | mutex_unlock(&mem_sysfs_mutex); |
e4619c85 NF |
588 | return ret; |
589 | } | |
590 | ||
3947be19 DH |
591 | int remove_memory_block(unsigned long node_id, struct mem_section *section, |
592 | int phys_device) | |
593 | { | |
594 | struct memory_block *mem; | |
595 | ||
2938ffbd | 596 | mutex_lock(&mem_sysfs_mutex); |
3947be19 | 597 | mem = find_memory_block(section); |
d3360164 | 598 | unregister_mem_sect_under_nodes(mem, __section_nr(section)); |
07681215 NF |
599 | |
600 | mem->section_count--; | |
601 | if (mem->section_count == 0) { | |
07681215 | 602 | mem_remove_simple_file(mem, phys_index); |
d3360164 | 603 | mem_remove_simple_file(mem, end_phys_index); |
07681215 NF |
604 | mem_remove_simple_file(mem, state); |
605 | mem_remove_simple_file(mem, phys_device); | |
606 | mem_remove_simple_file(mem, removable); | |
0c2c99b1 NF |
607 | unregister_memory(mem); |
608 | kfree(mem); | |
609 | } else | |
610 | kobject_put(&mem->sysdev.kobj); | |
3947be19 | 611 | |
2938ffbd | 612 | mutex_unlock(&mem_sysfs_mutex); |
3947be19 DH |
613 | return 0; |
614 | } | |
615 | ||
616 | /* | |
617 | * need an interface for the VM to add new memory regions, | |
618 | * but without onlining it. | |
619 | */ | |
c04fc586 | 620 | int register_new_memory(int nid, struct mem_section *section) |
3947be19 | 621 | { |
0c2c99b1 | 622 | return add_memory_section(nid, section, MEM_OFFLINE, HOTPLUG); |
3947be19 DH |
623 | } |
624 | ||
625 | int unregister_memory_section(struct mem_section *section) | |
626 | { | |
540557b9 | 627 | if (!present_section(section)) |
3947be19 DH |
628 | return -EINVAL; |
629 | ||
630 | return remove_memory_block(0, section, 0); | |
631 | } | |
632 | ||
633 | /* | |
634 | * Initialize the sysfs support for memory devices... | |
635 | */ | |
636 | int __init memory_dev_init(void) | |
637 | { | |
638 | unsigned int i; | |
639 | int ret; | |
28ec24e2 | 640 | int err; |
0c2c99b1 | 641 | unsigned long block_sz; |
3947be19 | 642 | |
312c004d | 643 | memory_sysdev_class.kset.uevent_ops = &memory_uevent_ops; |
3947be19 | 644 | ret = sysdev_class_register(&memory_sysdev_class); |
28ec24e2 AM |
645 | if (ret) |
646 | goto out; | |
3947be19 | 647 | |
0c2c99b1 NF |
648 | block_sz = get_memory_block_size(); |
649 | sections_per_block = block_sz / MIN_MEMORY_BLOCK_SIZE; | |
650 | ||
3947be19 DH |
651 | /* |
652 | * Create entries for memory sections that were found | |
653 | * during boot and have been initialized | |
654 | */ | |
655 | for (i = 0; i < NR_MEM_SECTIONS; i++) { | |
540557b9 | 656 | if (!present_section_nr(i)) |
3947be19 | 657 | continue; |
0c2c99b1 NF |
658 | err = add_memory_section(0, __nr_to_section(i), MEM_ONLINE, |
659 | BOOT); | |
28ec24e2 AM |
660 | if (!ret) |
661 | ret = err; | |
3947be19 DH |
662 | } |
663 | ||
28ec24e2 | 664 | err = memory_probe_init(); |
facb6011 AK |
665 | if (!ret) |
666 | ret = err; | |
667 | err = memory_fail_init(); | |
28ec24e2 AM |
668 | if (!ret) |
669 | ret = err; | |
670 | err = block_size_init(); | |
671 | if (!ret) | |
672 | ret = err; | |
673 | out: | |
674 | if (ret) | |
2b3a302a | 675 | printk(KERN_ERR "%s() failed: %d\n", __func__, ret); |
3947be19 DH |
676 | return ret; |
677 | } |