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Commit | Line | Data |
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3947be19 | 1 | /* |
10fbcf4c | 2 | * Memory subsystem support |
3947be19 DH |
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 | ||
3947be19 DH |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> | |
3947be19 | 15 | #include <linux/topology.h> |
c59ede7b | 16 | #include <linux/capability.h> |
3947be19 DH |
17 | #include <linux/device.h> |
18 | #include <linux/memory.h> | |
19 | #include <linux/kobject.h> | |
20 | #include <linux/memory_hotplug.h> | |
21 | #include <linux/mm.h> | |
da19cbcf | 22 | #include <linux/mutex.h> |
9f1b16a5 | 23 | #include <linux/stat.h> |
5a0e3ad6 | 24 | #include <linux/slab.h> |
9f1b16a5 | 25 | |
60063497 | 26 | #include <linux/atomic.h> |
3947be19 DH |
27 | #include <asm/uaccess.h> |
28 | ||
2938ffbd NF |
29 | static DEFINE_MUTEX(mem_sysfs_mutex); |
30 | ||
3947be19 | 31 | #define MEMORY_CLASS_NAME "memory" |
0c2c99b1 NF |
32 | |
33 | static int sections_per_block; | |
34 | ||
35 | static inline int base_memory_block_id(int section_nr) | |
36 | { | |
37 | return section_nr / sections_per_block; | |
38 | } | |
3947be19 | 39 | |
10fbcf4c | 40 | static struct bus_type memory_subsys = { |
af5ca3f4 | 41 | .name = MEMORY_CLASS_NAME, |
10fbcf4c | 42 | .dev_name = MEMORY_CLASS_NAME, |
3947be19 DH |
43 | }; |
44 | ||
e041c683 | 45 | static BLOCKING_NOTIFIER_HEAD(memory_chain); |
3947be19 | 46 | |
98a38ebd | 47 | int register_memory_notifier(struct notifier_block *nb) |
3947be19 | 48 | { |
e041c683 | 49 | return blocking_notifier_chain_register(&memory_chain, nb); |
3947be19 | 50 | } |
3c82c30c | 51 | EXPORT_SYMBOL(register_memory_notifier); |
3947be19 | 52 | |
98a38ebd | 53 | void unregister_memory_notifier(struct notifier_block *nb) |
3947be19 | 54 | { |
e041c683 | 55 | blocking_notifier_chain_unregister(&memory_chain, nb); |
3947be19 | 56 | } |
3c82c30c | 57 | EXPORT_SYMBOL(unregister_memory_notifier); |
3947be19 | 58 | |
925cc71e RJ |
59 | static ATOMIC_NOTIFIER_HEAD(memory_isolate_chain); |
60 | ||
61 | int register_memory_isolate_notifier(struct notifier_block *nb) | |
62 | { | |
63 | return atomic_notifier_chain_register(&memory_isolate_chain, nb); | |
64 | } | |
65 | EXPORT_SYMBOL(register_memory_isolate_notifier); | |
66 | ||
67 | void unregister_memory_isolate_notifier(struct notifier_block *nb) | |
68 | { | |
69 | atomic_notifier_chain_unregister(&memory_isolate_chain, nb); | |
70 | } | |
71 | EXPORT_SYMBOL(unregister_memory_isolate_notifier); | |
72 | ||
3947be19 DH |
73 | /* |
74 | * register_memory - Setup a sysfs device for a memory block | |
75 | */ | |
00a41db5 | 76 | static |
0c2c99b1 | 77 | int register_memory(struct memory_block *memory) |
3947be19 DH |
78 | { |
79 | int error; | |
80 | ||
10fbcf4c KS |
81 | memory->dev.bus = &memory_subsys; |
82 | memory->dev.id = memory->start_section_nr / sections_per_block; | |
3947be19 | 83 | |
10fbcf4c | 84 | error = device_register(&memory->dev); |
3947be19 DH |
85 | return error; |
86 | } | |
87 | ||
88 | static void | |
0c2c99b1 | 89 | unregister_memory(struct memory_block *memory) |
3947be19 | 90 | { |
10fbcf4c | 91 | BUG_ON(memory->dev.bus != &memory_subsys); |
3947be19 | 92 | |
00a41db5 | 93 | /* drop the ref. we got in remove_memory_block() */ |
10fbcf4c KS |
94 | kobject_put(&memory->dev.kobj); |
95 | device_unregister(&memory->dev); | |
3947be19 DH |
96 | } |
97 | ||
0c2c99b1 NF |
98 | unsigned long __weak memory_block_size_bytes(void) |
99 | { | |
100 | return MIN_MEMORY_BLOCK_SIZE; | |
101 | } | |
102 | ||
103 | static unsigned long get_memory_block_size(void) | |
104 | { | |
105 | unsigned long block_sz; | |
106 | ||
107 | block_sz = memory_block_size_bytes(); | |
108 | ||
109 | /* Validate blk_sz is a power of 2 and not less than section size */ | |
110 | if ((block_sz & (block_sz - 1)) || (block_sz < MIN_MEMORY_BLOCK_SIZE)) { | |
111 | WARN_ON(1); | |
112 | block_sz = MIN_MEMORY_BLOCK_SIZE; | |
113 | } | |
114 | ||
115 | return block_sz; | |
116 | } | |
117 | ||
3947be19 DH |
118 | /* |
119 | * use this as the physical section index that this memsection | |
120 | * uses. | |
121 | */ | |
122 | ||
10fbcf4c KS |
123 | static ssize_t show_mem_start_phys_index(struct device *dev, |
124 | struct device_attribute *attr, char *buf) | |
3947be19 DH |
125 | { |
126 | struct memory_block *mem = | |
10fbcf4c | 127 | container_of(dev, struct memory_block, dev); |
d3360164 NF |
128 | unsigned long phys_index; |
129 | ||
130 | phys_index = mem->start_section_nr / sections_per_block; | |
131 | return sprintf(buf, "%08lx\n", phys_index); | |
132 | } | |
133 | ||
10fbcf4c KS |
134 | static ssize_t show_mem_end_phys_index(struct device *dev, |
135 | struct device_attribute *attr, char *buf) | |
d3360164 NF |
136 | { |
137 | struct memory_block *mem = | |
10fbcf4c | 138 | container_of(dev, struct memory_block, dev); |
d3360164 NF |
139 | unsigned long phys_index; |
140 | ||
141 | phys_index = mem->end_section_nr / sections_per_block; | |
142 | return sprintf(buf, "%08lx\n", phys_index); | |
3947be19 DH |
143 | } |
144 | ||
5c755e9f BP |
145 | /* |
146 | * Show whether the section of memory is likely to be hot-removable | |
147 | */ | |
10fbcf4c KS |
148 | static ssize_t show_mem_removable(struct device *dev, |
149 | struct device_attribute *attr, char *buf) | |
5c755e9f | 150 | { |
0c2c99b1 NF |
151 | unsigned long i, pfn; |
152 | int ret = 1; | |
5c755e9f | 153 | struct memory_block *mem = |
10fbcf4c | 154 | container_of(dev, struct memory_block, dev); |
5c755e9f | 155 | |
0c2c99b1 | 156 | for (i = 0; i < sections_per_block; i++) { |
d3360164 | 157 | pfn = section_nr_to_pfn(mem->start_section_nr + i); |
0c2c99b1 NF |
158 | ret &= is_mem_section_removable(pfn, PAGES_PER_SECTION); |
159 | } | |
160 | ||
5c755e9f BP |
161 | return sprintf(buf, "%d\n", ret); |
162 | } | |
163 | ||
3947be19 DH |
164 | /* |
165 | * online, offline, going offline, etc. | |
166 | */ | |
10fbcf4c KS |
167 | static ssize_t show_mem_state(struct device *dev, |
168 | struct device_attribute *attr, char *buf) | |
3947be19 DH |
169 | { |
170 | struct memory_block *mem = | |
10fbcf4c | 171 | container_of(dev, struct memory_block, dev); |
3947be19 DH |
172 | ssize_t len = 0; |
173 | ||
174 | /* | |
175 | * We can probably put these states in a nice little array | |
176 | * so that they're not open-coded | |
177 | */ | |
178 | switch (mem->state) { | |
179 | case MEM_ONLINE: | |
180 | len = sprintf(buf, "online\n"); | |
181 | break; | |
182 | case MEM_OFFLINE: | |
183 | len = sprintf(buf, "offline\n"); | |
184 | break; | |
185 | case MEM_GOING_OFFLINE: | |
186 | len = sprintf(buf, "going-offline\n"); | |
187 | break; | |
188 | default: | |
189 | len = sprintf(buf, "ERROR-UNKNOWN-%ld\n", | |
190 | mem->state); | |
191 | WARN_ON(1); | |
192 | break; | |
193 | } | |
194 | ||
195 | return len; | |
196 | } | |
197 | ||
7b78d335 | 198 | int memory_notify(unsigned long val, void *v) |
3947be19 | 199 | { |
e041c683 | 200 | return blocking_notifier_call_chain(&memory_chain, val, v); |
3947be19 DH |
201 | } |
202 | ||
925cc71e RJ |
203 | int memory_isolate_notify(unsigned long val, void *v) |
204 | { | |
205 | return atomic_notifier_call_chain(&memory_isolate_chain, val, v); | |
206 | } | |
207 | ||
2bbcb878 MG |
208 | /* |
209 | * The probe routines leave the pages reserved, just as the bootmem code does. | |
210 | * Make sure they're still that way. | |
211 | */ | |
212 | static bool pages_correctly_reserved(unsigned long start_pfn, | |
213 | unsigned long nr_pages) | |
214 | { | |
215 | int i, j; | |
216 | struct page *page; | |
217 | unsigned long pfn = start_pfn; | |
218 | ||
219 | /* | |
220 | * memmap between sections is not contiguous except with | |
221 | * SPARSEMEM_VMEMMAP. We lookup the page once per section | |
222 | * and assume memmap is contiguous within each section | |
223 | */ | |
224 | for (i = 0; i < sections_per_block; i++, pfn += PAGES_PER_SECTION) { | |
225 | if (WARN_ON_ONCE(!pfn_valid(pfn))) | |
226 | return false; | |
227 | page = pfn_to_page(pfn); | |
228 | ||
229 | for (j = 0; j < PAGES_PER_SECTION; j++) { | |
230 | if (PageReserved(page + j)) | |
231 | continue; | |
232 | ||
233 | printk(KERN_WARNING "section number %ld page number %d " | |
234 | "not reserved, was it already online?\n", | |
235 | pfn_to_section_nr(pfn), j); | |
236 | ||
237 | return false; | |
238 | } | |
239 | } | |
240 | ||
241 | return true; | |
242 | } | |
243 | ||
3947be19 DH |
244 | /* |
245 | * MEMORY_HOTPLUG depends on SPARSEMEM in mm/Kconfig, so it is | |
246 | * OK to have direct references to sparsemem variables in here. | |
247 | */ | |
248 | static int | |
5409d2cd | 249 | memory_block_action(unsigned long phys_index, unsigned long action) |
3947be19 | 250 | { |
a16cee10 | 251 | unsigned long start_pfn; |
5409d2cd | 252 | unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block; |
de0ed36a | 253 | struct page *first_page; |
3947be19 | 254 | int ret; |
3947be19 | 255 | |
de0ed36a | 256 | first_page = pfn_to_page(phys_index << PFN_SECTION_SHIFT); |
a16cee10 | 257 | start_pfn = page_to_pfn(first_page); |
de0ed36a | 258 | |
3947be19 DH |
259 | switch (action) { |
260 | case MEM_ONLINE: | |
2bbcb878 MG |
261 | if (!pages_correctly_reserved(start_pfn, nr_pages)) |
262 | return -EBUSY; | |
263 | ||
5409d2cd | 264 | ret = online_pages(start_pfn, nr_pages); |
3947be19 DH |
265 | break; |
266 | case MEM_OFFLINE: | |
a16cee10 | 267 | ret = offline_pages(start_pfn, nr_pages); |
3947be19 DH |
268 | break; |
269 | default: | |
0c2c99b1 NF |
270 | WARN(1, KERN_WARNING "%s(%ld, %ld) unknown action: " |
271 | "%ld\n", __func__, phys_index, action, action); | |
3947be19 DH |
272 | ret = -EINVAL; |
273 | } | |
3947be19 DH |
274 | |
275 | return ret; | |
276 | } | |
277 | ||
e90bdb7f | 278 | static int __memory_block_change_state(struct memory_block *mem, |
3947be19 DH |
279 | unsigned long to_state, unsigned long from_state_req) |
280 | { | |
de0ed36a | 281 | int ret = 0; |
0c2c99b1 | 282 | |
3947be19 DH |
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 | ||
5409d2cd | 291 | ret = memory_block_action(mem->start_section_nr, to_state); |
0c2c99b1 | 292 | |
f5138e42 | 293 | if (ret) { |
0c2c99b1 | 294 | mem->state = from_state_req; |
f5138e42 MH |
295 | goto out; |
296 | } | |
3947be19 | 297 | |
f5138e42 MH |
298 | mem->state = to_state; |
299 | switch (mem->state) { | |
300 | case MEM_OFFLINE: | |
301 | kobject_uevent(&mem->dev.kobj, KOBJ_OFFLINE); | |
302 | break; | |
303 | case MEM_ONLINE: | |
304 | kobject_uevent(&mem->dev.kobj, KOBJ_ONLINE); | |
305 | break; | |
306 | default: | |
307 | break; | |
308 | } | |
3947be19 | 309 | out: |
3947be19 DH |
310 | return ret; |
311 | } | |
312 | ||
e90bdb7f WC |
313 | static int memory_block_change_state(struct memory_block *mem, |
314 | unsigned long to_state, unsigned long from_state_req) | |
315 | { | |
316 | int ret; | |
317 | ||
318 | mutex_lock(&mem->state_mutex); | |
319 | ret = __memory_block_change_state(mem, to_state, from_state_req); | |
320 | mutex_unlock(&mem->state_mutex); | |
321 | ||
322 | return ret; | |
323 | } | |
3947be19 | 324 | static ssize_t |
10fbcf4c KS |
325 | store_mem_state(struct device *dev, |
326 | struct device_attribute *attr, const char *buf, size_t count) | |
3947be19 DH |
327 | { |
328 | struct memory_block *mem; | |
3947be19 DH |
329 | int ret = -EINVAL; |
330 | ||
10fbcf4c | 331 | mem = container_of(dev, struct memory_block, dev); |
3947be19 DH |
332 | |
333 | if (!strncmp(buf, "online", min((int)count, 6))) | |
334 | ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE); | |
335 | else if(!strncmp(buf, "offline", min((int)count, 7))) | |
336 | ret = memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE); | |
0c2c99b1 | 337 | |
3947be19 DH |
338 | if (ret) |
339 | return ret; | |
340 | return count; | |
341 | } | |
342 | ||
343 | /* | |
344 | * phys_device is a bad name for this. What I really want | |
345 | * is a way to differentiate between memory ranges that | |
346 | * are part of physical devices that constitute | |
347 | * a complete removable unit or fru. | |
348 | * i.e. do these ranges belong to the same physical device, | |
349 | * s.t. if I offline all of these sections I can then | |
350 | * remove the physical device? | |
351 | */ | |
10fbcf4c KS |
352 | static ssize_t show_phys_device(struct device *dev, |
353 | struct device_attribute *attr, char *buf) | |
3947be19 DH |
354 | { |
355 | struct memory_block *mem = | |
10fbcf4c | 356 | container_of(dev, struct memory_block, dev); |
3947be19 DH |
357 | return sprintf(buf, "%d\n", mem->phys_device); |
358 | } | |
359 | ||
10fbcf4c KS |
360 | static DEVICE_ATTR(phys_index, 0444, show_mem_start_phys_index, NULL); |
361 | static DEVICE_ATTR(end_phys_index, 0444, show_mem_end_phys_index, NULL); | |
362 | static DEVICE_ATTR(state, 0644, show_mem_state, store_mem_state); | |
363 | static DEVICE_ATTR(phys_device, 0444, show_phys_device, NULL); | |
364 | static DEVICE_ATTR(removable, 0444, show_mem_removable, NULL); | |
3947be19 DH |
365 | |
366 | #define mem_create_simple_file(mem, attr_name) \ | |
10fbcf4c | 367 | device_create_file(&mem->dev, &dev_attr_##attr_name) |
3947be19 | 368 | #define mem_remove_simple_file(mem, attr_name) \ |
10fbcf4c | 369 | device_remove_file(&mem->dev, &dev_attr_##attr_name) |
3947be19 DH |
370 | |
371 | /* | |
372 | * Block size attribute stuff | |
373 | */ | |
374 | static ssize_t | |
10fbcf4c | 375 | print_block_size(struct device *dev, struct device_attribute *attr, |
8564a6c1 | 376 | char *buf) |
3947be19 | 377 | { |
0c2c99b1 | 378 | return sprintf(buf, "%lx\n", get_memory_block_size()); |
3947be19 DH |
379 | } |
380 | ||
10fbcf4c | 381 | static DEVICE_ATTR(block_size_bytes, 0444, print_block_size, NULL); |
3947be19 DH |
382 | |
383 | static int block_size_init(void) | |
384 | { | |
10fbcf4c KS |
385 | return device_create_file(memory_subsys.dev_root, |
386 | &dev_attr_block_size_bytes); | |
3947be19 DH |
387 | } |
388 | ||
389 | /* | |
390 | * Some architectures will have custom drivers to do this, and | |
391 | * will not need to do it from userspace. The fake hot-add code | |
392 | * as well as ppc64 will do all of their discovery in userspace | |
393 | * and will require this interface. | |
394 | */ | |
395 | #ifdef CONFIG_ARCH_MEMORY_PROBE | |
396 | static ssize_t | |
10fbcf4c | 397 | memory_probe_store(struct device *dev, struct device_attribute *attr, |
28812fe1 | 398 | const char *buf, size_t count) |
3947be19 DH |
399 | { |
400 | u64 phys_addr; | |
bc02af93 | 401 | int nid; |
6add7cd6 | 402 | int i, ret; |
61b94fea | 403 | unsigned long pages_per_block = PAGES_PER_SECTION * sections_per_block; |
3947be19 DH |
404 | |
405 | phys_addr = simple_strtoull(buf, NULL, 0); | |
406 | ||
61b94fea AB |
407 | if (phys_addr & ((pages_per_block << PAGE_SHIFT) - 1)) |
408 | return -EINVAL; | |
409 | ||
6add7cd6 NF |
410 | for (i = 0; i < sections_per_block; i++) { |
411 | nid = memory_add_physaddr_to_nid(phys_addr); | |
412 | ret = add_memory(nid, phys_addr, | |
413 | PAGES_PER_SECTION << PAGE_SHIFT); | |
414 | if (ret) | |
9f0af69b | 415 | goto out; |
6add7cd6 NF |
416 | |
417 | phys_addr += MIN_MEMORY_BLOCK_SIZE; | |
418 | } | |
3947be19 | 419 | |
9f0af69b NK |
420 | ret = count; |
421 | out: | |
422 | return ret; | |
3947be19 | 423 | } |
10fbcf4c | 424 | static DEVICE_ATTR(probe, S_IWUSR, NULL, memory_probe_store); |
3947be19 DH |
425 | |
426 | static int memory_probe_init(void) | |
427 | { | |
10fbcf4c | 428 | return device_create_file(memory_subsys.dev_root, &dev_attr_probe); |
3947be19 DH |
429 | } |
430 | #else | |
28ec24e2 AM |
431 | static inline int memory_probe_init(void) |
432 | { | |
433 | return 0; | |
434 | } | |
3947be19 DH |
435 | #endif |
436 | ||
facb6011 AK |
437 | #ifdef CONFIG_MEMORY_FAILURE |
438 | /* | |
439 | * Support for offlining pages of memory | |
440 | */ | |
441 | ||
442 | /* Soft offline a page */ | |
443 | static ssize_t | |
10fbcf4c KS |
444 | store_soft_offline_page(struct device *dev, |
445 | struct device_attribute *attr, | |
28812fe1 | 446 | const char *buf, size_t count) |
facb6011 AK |
447 | { |
448 | int ret; | |
449 | u64 pfn; | |
450 | if (!capable(CAP_SYS_ADMIN)) | |
451 | return -EPERM; | |
452 | if (strict_strtoull(buf, 0, &pfn) < 0) | |
453 | return -EINVAL; | |
454 | pfn >>= PAGE_SHIFT; | |
455 | if (!pfn_valid(pfn)) | |
456 | return -ENXIO; | |
457 | ret = soft_offline_page(pfn_to_page(pfn), 0); | |
458 | return ret == 0 ? count : ret; | |
459 | } | |
460 | ||
461 | /* Forcibly offline a page, including killing processes. */ | |
462 | static ssize_t | |
10fbcf4c KS |
463 | store_hard_offline_page(struct device *dev, |
464 | struct device_attribute *attr, | |
28812fe1 | 465 | const char *buf, size_t count) |
facb6011 AK |
466 | { |
467 | int ret; | |
468 | u64 pfn; | |
469 | if (!capable(CAP_SYS_ADMIN)) | |
470 | return -EPERM; | |
471 | if (strict_strtoull(buf, 0, &pfn) < 0) | |
472 | return -EINVAL; | |
473 | pfn >>= PAGE_SHIFT; | |
cd42f4a3 | 474 | ret = memory_failure(pfn, 0, 0); |
facb6011 AK |
475 | return ret ? ret : count; |
476 | } | |
477 | ||
10fbcf4c KS |
478 | static DEVICE_ATTR(soft_offline_page, 0644, NULL, store_soft_offline_page); |
479 | static DEVICE_ATTR(hard_offline_page, 0644, NULL, store_hard_offline_page); | |
facb6011 AK |
480 | |
481 | static __init int memory_fail_init(void) | |
482 | { | |
483 | int err; | |
484 | ||
10fbcf4c KS |
485 | err = device_create_file(memory_subsys.dev_root, |
486 | &dev_attr_soft_offline_page); | |
facb6011 | 487 | if (!err) |
10fbcf4c KS |
488 | err = device_create_file(memory_subsys.dev_root, |
489 | &dev_attr_hard_offline_page); | |
facb6011 AK |
490 | return err; |
491 | } | |
492 | #else | |
493 | static inline int memory_fail_init(void) | |
494 | { | |
495 | return 0; | |
496 | } | |
497 | #endif | |
498 | ||
3947be19 DH |
499 | /* |
500 | * Note that phys_device is optional. It is here to allow for | |
501 | * differentiation between which *physical* devices each | |
502 | * section belongs to... | |
503 | */ | |
bc32df00 HC |
504 | int __weak arch_get_memory_phys_device(unsigned long start_pfn) |
505 | { | |
506 | return 0; | |
507 | } | |
3947be19 | 508 | |
10fbcf4c KS |
509 | /* |
510 | * A reference for the returned object is held and the reference for the | |
511 | * hinted object is released. | |
512 | */ | |
98383031 RH |
513 | struct memory_block *find_memory_block_hinted(struct mem_section *section, |
514 | struct memory_block *hint) | |
3947be19 | 515 | { |
0c2c99b1 | 516 | int block_id = base_memory_block_id(__section_nr(section)); |
10fbcf4c KS |
517 | struct device *hintdev = hint ? &hint->dev : NULL; |
518 | struct device *dev; | |
3947be19 | 519 | |
10fbcf4c KS |
520 | dev = subsys_find_device_by_id(&memory_subsys, block_id, hintdev); |
521 | if (hint) | |
522 | put_device(&hint->dev); | |
523 | if (!dev) | |
3947be19 | 524 | return NULL; |
10fbcf4c | 525 | return container_of(dev, struct memory_block, dev); |
3947be19 DH |
526 | } |
527 | ||
98383031 RH |
528 | /* |
529 | * For now, we have a linear search to go find the appropriate | |
530 | * memory_block corresponding to a particular phys_index. If | |
531 | * this gets to be a real problem, we can always use a radix | |
532 | * tree or something here. | |
533 | * | |
10fbcf4c | 534 | * This could be made generic for all device subsystems. |
98383031 RH |
535 | */ |
536 | struct memory_block *find_memory_block(struct mem_section *section) | |
537 | { | |
538 | return find_memory_block_hinted(section, NULL); | |
539 | } | |
540 | ||
0c2c99b1 NF |
541 | static int init_memory_block(struct memory_block **memory, |
542 | struct mem_section *section, unsigned long state) | |
e4619c85 | 543 | { |
0c2c99b1 | 544 | struct memory_block *mem; |
e4619c85 | 545 | unsigned long start_pfn; |
0c2c99b1 | 546 | int scn_nr; |
e4619c85 NF |
547 | int ret = 0; |
548 | ||
0c2c99b1 | 549 | mem = kzalloc(sizeof(*mem), GFP_KERNEL); |
e4619c85 NF |
550 | if (!mem) |
551 | return -ENOMEM; | |
552 | ||
0c2c99b1 | 553 | scn_nr = __section_nr(section); |
d3360164 NF |
554 | mem->start_section_nr = |
555 | base_memory_block_id(scn_nr) * sections_per_block; | |
556 | mem->end_section_nr = mem->start_section_nr + sections_per_block - 1; | |
e4619c85 | 557 | mem->state = state; |
07681215 | 558 | mem->section_count++; |
e4619c85 | 559 | mutex_init(&mem->state_mutex); |
d3360164 | 560 | start_pfn = section_nr_to_pfn(mem->start_section_nr); |
e4619c85 NF |
561 | mem->phys_device = arch_get_memory_phys_device(start_pfn); |
562 | ||
0c2c99b1 | 563 | ret = register_memory(mem); |
e4619c85 NF |
564 | if (!ret) |
565 | ret = mem_create_simple_file(mem, phys_index); | |
d3360164 NF |
566 | if (!ret) |
567 | ret = mem_create_simple_file(mem, end_phys_index); | |
e4619c85 NF |
568 | if (!ret) |
569 | ret = mem_create_simple_file(mem, state); | |
570 | if (!ret) | |
571 | ret = mem_create_simple_file(mem, phys_device); | |
572 | if (!ret) | |
573 | ret = mem_create_simple_file(mem, removable); | |
0c2c99b1 NF |
574 | |
575 | *memory = mem; | |
576 | return ret; | |
577 | } | |
578 | ||
579 | static int add_memory_section(int nid, struct mem_section *section, | |
321bf4ed | 580 | struct memory_block **mem_p, |
0c2c99b1 NF |
581 | unsigned long state, enum mem_add_context context) |
582 | { | |
321bf4ed YL |
583 | struct memory_block *mem = NULL; |
584 | int scn_nr = __section_nr(section); | |
0c2c99b1 NF |
585 | int ret = 0; |
586 | ||
587 | mutex_lock(&mem_sysfs_mutex); | |
588 | ||
321bf4ed YL |
589 | if (context == BOOT) { |
590 | /* same memory block ? */ | |
591 | if (mem_p && *mem_p) | |
592 | if (scn_nr >= (*mem_p)->start_section_nr && | |
593 | scn_nr <= (*mem_p)->end_section_nr) { | |
594 | mem = *mem_p; | |
595 | kobject_get(&mem->dev.kobj); | |
596 | } | |
597 | } else | |
598 | mem = find_memory_block(section); | |
599 | ||
0c2c99b1 NF |
600 | if (mem) { |
601 | mem->section_count++; | |
10fbcf4c | 602 | kobject_put(&mem->dev.kobj); |
321bf4ed | 603 | } else { |
0c2c99b1 | 604 | ret = init_memory_block(&mem, section, state); |
321bf4ed YL |
605 | /* store memory_block pointer for next loop */ |
606 | if (!ret && context == BOOT) | |
607 | if (mem_p) | |
608 | *mem_p = mem; | |
609 | } | |
0c2c99b1 | 610 | |
e4619c85 | 611 | if (!ret) { |
0c2c99b1 NF |
612 | if (context == HOTPLUG && |
613 | mem->section_count == sections_per_block) | |
e4619c85 NF |
614 | ret = register_mem_sect_under_node(mem, nid); |
615 | } | |
616 | ||
2938ffbd | 617 | mutex_unlock(&mem_sysfs_mutex); |
e4619c85 NF |
618 | return ret; |
619 | } | |
620 | ||
3947be19 DH |
621 | int remove_memory_block(unsigned long node_id, struct mem_section *section, |
622 | int phys_device) | |
623 | { | |
624 | struct memory_block *mem; | |
625 | ||
2938ffbd | 626 | mutex_lock(&mem_sysfs_mutex); |
3947be19 | 627 | mem = find_memory_block(section); |
d3360164 | 628 | unregister_mem_sect_under_nodes(mem, __section_nr(section)); |
07681215 NF |
629 | |
630 | mem->section_count--; | |
631 | if (mem->section_count == 0) { | |
07681215 | 632 | mem_remove_simple_file(mem, phys_index); |
d3360164 | 633 | mem_remove_simple_file(mem, end_phys_index); |
07681215 NF |
634 | mem_remove_simple_file(mem, state); |
635 | mem_remove_simple_file(mem, phys_device); | |
636 | mem_remove_simple_file(mem, removable); | |
0c2c99b1 NF |
637 | unregister_memory(mem); |
638 | kfree(mem); | |
639 | } else | |
10fbcf4c | 640 | kobject_put(&mem->dev.kobj); |
3947be19 | 641 | |
2938ffbd | 642 | mutex_unlock(&mem_sysfs_mutex); |
3947be19 DH |
643 | return 0; |
644 | } | |
645 | ||
646 | /* | |
647 | * need an interface for the VM to add new memory regions, | |
648 | * but without onlining it. | |
649 | */ | |
c04fc586 | 650 | int register_new_memory(int nid, struct mem_section *section) |
3947be19 | 651 | { |
321bf4ed | 652 | return add_memory_section(nid, section, NULL, MEM_OFFLINE, HOTPLUG); |
3947be19 DH |
653 | } |
654 | ||
655 | int unregister_memory_section(struct mem_section *section) | |
656 | { | |
540557b9 | 657 | if (!present_section(section)) |
3947be19 DH |
658 | return -EINVAL; |
659 | ||
660 | return remove_memory_block(0, section, 0); | |
661 | } | |
662 | ||
e90bdb7f WC |
663 | /* |
664 | * offline one memory block. If the memory block has been offlined, do nothing. | |
665 | */ | |
666 | int offline_memory_block(struct memory_block *mem) | |
667 | { | |
668 | int ret = 0; | |
669 | ||
670 | mutex_lock(&mem->state_mutex); | |
671 | if (mem->state != MEM_OFFLINE) | |
672 | ret = __memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE); | |
673 | mutex_unlock(&mem->state_mutex); | |
674 | ||
675 | return ret; | |
676 | } | |
677 | ||
3947be19 DH |
678 | /* |
679 | * Initialize the sysfs support for memory devices... | |
680 | */ | |
681 | int __init memory_dev_init(void) | |
682 | { | |
683 | unsigned int i; | |
684 | int ret; | |
28ec24e2 | 685 | int err; |
0c2c99b1 | 686 | unsigned long block_sz; |
321bf4ed | 687 | struct memory_block *mem = NULL; |
3947be19 | 688 | |
10fbcf4c | 689 | ret = subsys_system_register(&memory_subsys, NULL); |
28ec24e2 AM |
690 | if (ret) |
691 | goto out; | |
3947be19 | 692 | |
0c2c99b1 NF |
693 | block_sz = get_memory_block_size(); |
694 | sections_per_block = block_sz / MIN_MEMORY_BLOCK_SIZE; | |
695 | ||
3947be19 DH |
696 | /* |
697 | * Create entries for memory sections that were found | |
698 | * during boot and have been initialized | |
699 | */ | |
700 | for (i = 0; i < NR_MEM_SECTIONS; i++) { | |
540557b9 | 701 | if (!present_section_nr(i)) |
3947be19 | 702 | continue; |
321bf4ed YL |
703 | /* don't need to reuse memory_block if only one per block */ |
704 | err = add_memory_section(0, __nr_to_section(i), | |
705 | (sections_per_block == 1) ? NULL : &mem, | |
706 | MEM_ONLINE, | |
0c2c99b1 | 707 | BOOT); |
28ec24e2 AM |
708 | if (!ret) |
709 | ret = err; | |
3947be19 DH |
710 | } |
711 | ||
28ec24e2 | 712 | err = memory_probe_init(); |
facb6011 AK |
713 | if (!ret) |
714 | ret = err; | |
715 | err = memory_fail_init(); | |
28ec24e2 AM |
716 | if (!ret) |
717 | ret = err; | |
718 | err = block_size_init(); | |
719 | if (!ret) | |
720 | ret = err; | |
721 | out: | |
722 | if (ret) | |
2b3a302a | 723 | printk(KERN_ERR "%s() failed: %d\n", __func__, ret); |
3947be19 DH |
724 | return ret; |
725 | } |