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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 | |
4960e05e RW |
40 | static int memory_subsys_online(struct device *dev); |
41 | static int memory_subsys_offline(struct device *dev); | |
42 | ||
10fbcf4c | 43 | static struct bus_type memory_subsys = { |
af5ca3f4 | 44 | .name = MEMORY_CLASS_NAME, |
10fbcf4c | 45 | .dev_name = MEMORY_CLASS_NAME, |
4960e05e RW |
46 | .online = memory_subsys_online, |
47 | .offline = memory_subsys_offline, | |
3947be19 DH |
48 | }; |
49 | ||
e041c683 | 50 | static BLOCKING_NOTIFIER_HEAD(memory_chain); |
3947be19 | 51 | |
98a38ebd | 52 | int register_memory_notifier(struct notifier_block *nb) |
3947be19 | 53 | { |
e041c683 | 54 | return blocking_notifier_chain_register(&memory_chain, nb); |
3947be19 | 55 | } |
3c82c30c | 56 | EXPORT_SYMBOL(register_memory_notifier); |
3947be19 | 57 | |
98a38ebd | 58 | void unregister_memory_notifier(struct notifier_block *nb) |
3947be19 | 59 | { |
e041c683 | 60 | blocking_notifier_chain_unregister(&memory_chain, nb); |
3947be19 | 61 | } |
3c82c30c | 62 | EXPORT_SYMBOL(unregister_memory_notifier); |
3947be19 | 63 | |
925cc71e RJ |
64 | static ATOMIC_NOTIFIER_HEAD(memory_isolate_chain); |
65 | ||
66 | int register_memory_isolate_notifier(struct notifier_block *nb) | |
67 | { | |
68 | return atomic_notifier_chain_register(&memory_isolate_chain, nb); | |
69 | } | |
70 | EXPORT_SYMBOL(register_memory_isolate_notifier); | |
71 | ||
72 | void unregister_memory_isolate_notifier(struct notifier_block *nb) | |
73 | { | |
74 | atomic_notifier_chain_unregister(&memory_isolate_chain, nb); | |
75 | } | |
76 | EXPORT_SYMBOL(unregister_memory_isolate_notifier); | |
77 | ||
fa7194eb YI |
78 | static void memory_block_release(struct device *dev) |
79 | { | |
80 | struct memory_block *mem = container_of(dev, struct memory_block, dev); | |
81 | ||
82 | kfree(mem); | |
83 | } | |
84 | ||
0c2c99b1 NF |
85 | unsigned long __weak memory_block_size_bytes(void) |
86 | { | |
87 | return MIN_MEMORY_BLOCK_SIZE; | |
88 | } | |
89 | ||
90 | static unsigned long get_memory_block_size(void) | |
91 | { | |
92 | unsigned long block_sz; | |
93 | ||
94 | block_sz = memory_block_size_bytes(); | |
95 | ||
96 | /* Validate blk_sz is a power of 2 and not less than section size */ | |
97 | if ((block_sz & (block_sz - 1)) || (block_sz < MIN_MEMORY_BLOCK_SIZE)) { | |
98 | WARN_ON(1); | |
99 | block_sz = MIN_MEMORY_BLOCK_SIZE; | |
100 | } | |
101 | ||
102 | return block_sz; | |
103 | } | |
104 | ||
3947be19 DH |
105 | /* |
106 | * use this as the physical section index that this memsection | |
107 | * uses. | |
108 | */ | |
109 | ||
10fbcf4c KS |
110 | static ssize_t show_mem_start_phys_index(struct device *dev, |
111 | struct device_attribute *attr, char *buf) | |
3947be19 DH |
112 | { |
113 | struct memory_block *mem = | |
10fbcf4c | 114 | container_of(dev, struct memory_block, dev); |
d3360164 NF |
115 | unsigned long phys_index; |
116 | ||
117 | phys_index = mem->start_section_nr / sections_per_block; | |
118 | return sprintf(buf, "%08lx\n", phys_index); | |
119 | } | |
120 | ||
10fbcf4c KS |
121 | static ssize_t show_mem_end_phys_index(struct device *dev, |
122 | struct device_attribute *attr, char *buf) | |
d3360164 NF |
123 | { |
124 | struct memory_block *mem = | |
10fbcf4c | 125 | container_of(dev, struct memory_block, dev); |
d3360164 NF |
126 | unsigned long phys_index; |
127 | ||
128 | phys_index = mem->end_section_nr / sections_per_block; | |
129 | return sprintf(buf, "%08lx\n", phys_index); | |
3947be19 DH |
130 | } |
131 | ||
5c755e9f BP |
132 | /* |
133 | * Show whether the section of memory is likely to be hot-removable | |
134 | */ | |
10fbcf4c KS |
135 | static ssize_t show_mem_removable(struct device *dev, |
136 | struct device_attribute *attr, char *buf) | |
5c755e9f | 137 | { |
0c2c99b1 NF |
138 | unsigned long i, pfn; |
139 | int ret = 1; | |
5c755e9f | 140 | struct memory_block *mem = |
10fbcf4c | 141 | container_of(dev, struct memory_block, dev); |
5c755e9f | 142 | |
0c2c99b1 | 143 | for (i = 0; i < sections_per_block; i++) { |
d3360164 | 144 | pfn = section_nr_to_pfn(mem->start_section_nr + i); |
0c2c99b1 NF |
145 | ret &= is_mem_section_removable(pfn, PAGES_PER_SECTION); |
146 | } | |
147 | ||
5c755e9f BP |
148 | return sprintf(buf, "%d\n", ret); |
149 | } | |
150 | ||
3947be19 DH |
151 | /* |
152 | * online, offline, going offline, etc. | |
153 | */ | |
10fbcf4c KS |
154 | static ssize_t show_mem_state(struct device *dev, |
155 | struct device_attribute *attr, char *buf) | |
3947be19 DH |
156 | { |
157 | struct memory_block *mem = | |
10fbcf4c | 158 | container_of(dev, struct memory_block, dev); |
3947be19 DH |
159 | ssize_t len = 0; |
160 | ||
161 | /* | |
162 | * We can probably put these states in a nice little array | |
163 | * so that they're not open-coded | |
164 | */ | |
165 | switch (mem->state) { | |
166 | case MEM_ONLINE: | |
167 | len = sprintf(buf, "online\n"); | |
168 | break; | |
169 | case MEM_OFFLINE: | |
170 | len = sprintf(buf, "offline\n"); | |
171 | break; | |
172 | case MEM_GOING_OFFLINE: | |
173 | len = sprintf(buf, "going-offline\n"); | |
174 | break; | |
175 | default: | |
176 | len = sprintf(buf, "ERROR-UNKNOWN-%ld\n", | |
177 | mem->state); | |
178 | WARN_ON(1); | |
179 | break; | |
180 | } | |
181 | ||
182 | return len; | |
183 | } | |
184 | ||
7b78d335 | 185 | int memory_notify(unsigned long val, void *v) |
3947be19 | 186 | { |
e041c683 | 187 | return blocking_notifier_call_chain(&memory_chain, val, v); |
3947be19 DH |
188 | } |
189 | ||
925cc71e RJ |
190 | int memory_isolate_notify(unsigned long val, void *v) |
191 | { | |
192 | return atomic_notifier_call_chain(&memory_isolate_chain, val, v); | |
193 | } | |
194 | ||
2bbcb878 MG |
195 | /* |
196 | * The probe routines leave the pages reserved, just as the bootmem code does. | |
197 | * Make sure they're still that way. | |
198 | */ | |
6056d619 | 199 | static bool pages_correctly_reserved(unsigned long start_pfn) |
2bbcb878 MG |
200 | { |
201 | int i, j; | |
202 | struct page *page; | |
203 | unsigned long pfn = start_pfn; | |
204 | ||
205 | /* | |
206 | * memmap between sections is not contiguous except with | |
207 | * SPARSEMEM_VMEMMAP. We lookup the page once per section | |
208 | * and assume memmap is contiguous within each section | |
209 | */ | |
210 | for (i = 0; i < sections_per_block; i++, pfn += PAGES_PER_SECTION) { | |
211 | if (WARN_ON_ONCE(!pfn_valid(pfn))) | |
212 | return false; | |
213 | page = pfn_to_page(pfn); | |
214 | ||
215 | for (j = 0; j < PAGES_PER_SECTION; j++) { | |
216 | if (PageReserved(page + j)) | |
217 | continue; | |
218 | ||
219 | printk(KERN_WARNING "section number %ld page number %d " | |
220 | "not reserved, was it already online?\n", | |
221 | pfn_to_section_nr(pfn), j); | |
222 | ||
223 | return false; | |
224 | } | |
225 | } | |
226 | ||
227 | return true; | |
228 | } | |
229 | ||
3947be19 DH |
230 | /* |
231 | * MEMORY_HOTPLUG depends on SPARSEMEM in mm/Kconfig, so it is | |
232 | * OK to have direct references to sparsemem variables in here. | |
233 | */ | |
234 | static int | |
511c2aba | 235 | memory_block_action(unsigned long phys_index, unsigned long action, int online_type) |
3947be19 | 236 | { |
a16cee10 | 237 | unsigned long start_pfn; |
5409d2cd | 238 | unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block; |
de0ed36a | 239 | struct page *first_page; |
3947be19 | 240 | int ret; |
3947be19 | 241 | |
de0ed36a | 242 | first_page = pfn_to_page(phys_index << PFN_SECTION_SHIFT); |
a16cee10 | 243 | start_pfn = page_to_pfn(first_page); |
de0ed36a | 244 | |
3947be19 DH |
245 | switch (action) { |
246 | case MEM_ONLINE: | |
6056d619 | 247 | if (!pages_correctly_reserved(start_pfn)) |
2bbcb878 MG |
248 | return -EBUSY; |
249 | ||
511c2aba | 250 | ret = online_pages(start_pfn, nr_pages, online_type); |
3947be19 DH |
251 | break; |
252 | case MEM_OFFLINE: | |
a16cee10 | 253 | ret = offline_pages(start_pfn, nr_pages); |
3947be19 DH |
254 | break; |
255 | default: | |
0c2c99b1 NF |
256 | WARN(1, KERN_WARNING "%s(%ld, %ld) unknown action: " |
257 | "%ld\n", __func__, phys_index, action, action); | |
3947be19 DH |
258 | ret = -EINVAL; |
259 | } | |
3947be19 DH |
260 | |
261 | return ret; | |
262 | } | |
263 | ||
e90bdb7f | 264 | static int __memory_block_change_state(struct memory_block *mem, |
511c2aba LJ |
265 | unsigned long to_state, unsigned long from_state_req, |
266 | int online_type) | |
3947be19 | 267 | { |
de0ed36a | 268 | int ret = 0; |
0c2c99b1 | 269 | |
4960e05e RW |
270 | if (mem->state != from_state_req) |
271 | return -EINVAL; | |
3947be19 | 272 | |
0c2c99b1 NF |
273 | if (to_state == MEM_OFFLINE) |
274 | mem->state = MEM_GOING_OFFLINE; | |
275 | ||
511c2aba | 276 | ret = memory_block_action(mem->start_section_nr, to_state, online_type); |
b2c064b2 | 277 | mem->state = ret ? from_state_req : to_state; |
4960e05e RW |
278 | return ret; |
279 | } | |
0c2c99b1 | 280 | |
4960e05e RW |
281 | static int memory_subsys_online(struct device *dev) |
282 | { | |
283 | struct memory_block *mem = container_of(dev, struct memory_block, dev); | |
284 | int ret; | |
3947be19 | 285 | |
4960e05e RW |
286 | mutex_lock(&mem->state_mutex); |
287 | ||
288 | ret = mem->state == MEM_ONLINE ? 0 : | |
289 | __memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE, | |
b2c064b2 | 290 | ONLINE_KEEP); |
4960e05e RW |
291 | |
292 | mutex_unlock(&mem->state_mutex); | |
293 | return ret; | |
294 | } | |
295 | ||
296 | static int memory_subsys_offline(struct device *dev) | |
297 | { | |
298 | struct memory_block *mem = container_of(dev, struct memory_block, dev); | |
299 | int ret; | |
300 | ||
301 | mutex_lock(&mem->state_mutex); | |
302 | ||
303 | ret = mem->state == MEM_OFFLINE ? 0 : | |
304 | __memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE, -1); | |
305 | ||
306 | mutex_unlock(&mem->state_mutex); | |
307 | return ret; | |
308 | } | |
309 | ||
310 | static int __memory_block_change_state_uevent(struct memory_block *mem, | |
311 | unsigned long to_state, unsigned long from_state_req, | |
312 | int online_type) | |
313 | { | |
314 | int ret = __memory_block_change_state(mem, to_state, from_state_req, | |
315 | online_type); | |
316 | if (!ret) { | |
317 | switch (mem->state) { | |
318 | case MEM_OFFLINE: | |
319 | kobject_uevent(&mem->dev.kobj, KOBJ_OFFLINE); | |
320 | break; | |
321 | case MEM_ONLINE: | |
322 | kobject_uevent(&mem->dev.kobj, KOBJ_ONLINE); | |
323 | break; | |
324 | default: | |
325 | break; | |
326 | } | |
f5138e42 | 327 | } |
3947be19 DH |
328 | return ret; |
329 | } | |
330 | ||
e90bdb7f | 331 | static int memory_block_change_state(struct memory_block *mem, |
511c2aba LJ |
332 | unsigned long to_state, unsigned long from_state_req, |
333 | int online_type) | |
e90bdb7f WC |
334 | { |
335 | int ret; | |
336 | ||
337 | mutex_lock(&mem->state_mutex); | |
4960e05e RW |
338 | ret = __memory_block_change_state_uevent(mem, to_state, from_state_req, |
339 | online_type); | |
e90bdb7f WC |
340 | mutex_unlock(&mem->state_mutex); |
341 | ||
342 | return ret; | |
343 | } | |
3947be19 | 344 | static ssize_t |
10fbcf4c KS |
345 | store_mem_state(struct device *dev, |
346 | struct device_attribute *attr, const char *buf, size_t count) | |
3947be19 DH |
347 | { |
348 | struct memory_block *mem; | |
4960e05e | 349 | bool offline; |
3947be19 DH |
350 | int ret = -EINVAL; |
351 | ||
10fbcf4c | 352 | mem = container_of(dev, struct memory_block, dev); |
3947be19 | 353 | |
4960e05e RW |
354 | lock_device_hotplug(); |
355 | ||
356 | if (!strncmp(buf, "online_kernel", min_t(int, count, 13))) { | |
357 | offline = false; | |
511c2aba LJ |
358 | ret = memory_block_change_state(mem, MEM_ONLINE, |
359 | MEM_OFFLINE, ONLINE_KERNEL); | |
4960e05e RW |
360 | } else if (!strncmp(buf, "online_movable", min_t(int, count, 14))) { |
361 | offline = false; | |
511c2aba LJ |
362 | ret = memory_block_change_state(mem, MEM_ONLINE, |
363 | MEM_OFFLINE, ONLINE_MOVABLE); | |
4960e05e RW |
364 | } else if (!strncmp(buf, "online", min_t(int, count, 6))) { |
365 | offline = false; | |
511c2aba LJ |
366 | ret = memory_block_change_state(mem, MEM_ONLINE, |
367 | MEM_OFFLINE, ONLINE_KEEP); | |
4960e05e RW |
368 | } else if(!strncmp(buf, "offline", min_t(int, count, 7))) { |
369 | offline = true; | |
511c2aba LJ |
370 | ret = memory_block_change_state(mem, MEM_OFFLINE, |
371 | MEM_ONLINE, -1); | |
4960e05e RW |
372 | } |
373 | if (!ret) | |
374 | dev->offline = offline; | |
375 | ||
376 | unlock_device_hotplug(); | |
0c2c99b1 | 377 | |
3947be19 DH |
378 | if (ret) |
379 | return ret; | |
380 | return count; | |
381 | } | |
382 | ||
383 | /* | |
384 | * phys_device is a bad name for this. What I really want | |
385 | * is a way to differentiate between memory ranges that | |
386 | * are part of physical devices that constitute | |
387 | * a complete removable unit or fru. | |
388 | * i.e. do these ranges belong to the same physical device, | |
389 | * s.t. if I offline all of these sections I can then | |
390 | * remove the physical device? | |
391 | */ | |
10fbcf4c KS |
392 | static ssize_t show_phys_device(struct device *dev, |
393 | struct device_attribute *attr, char *buf) | |
3947be19 DH |
394 | { |
395 | struct memory_block *mem = | |
10fbcf4c | 396 | container_of(dev, struct memory_block, dev); |
3947be19 DH |
397 | return sprintf(buf, "%d\n", mem->phys_device); |
398 | } | |
399 | ||
10fbcf4c KS |
400 | static DEVICE_ATTR(phys_index, 0444, show_mem_start_phys_index, NULL); |
401 | static DEVICE_ATTR(end_phys_index, 0444, show_mem_end_phys_index, NULL); | |
402 | static DEVICE_ATTR(state, 0644, show_mem_state, store_mem_state); | |
403 | static DEVICE_ATTR(phys_device, 0444, show_phys_device, NULL); | |
404 | static DEVICE_ATTR(removable, 0444, show_mem_removable, NULL); | |
3947be19 | 405 | |
3947be19 DH |
406 | /* |
407 | * Block size attribute stuff | |
408 | */ | |
409 | static ssize_t | |
10fbcf4c | 410 | print_block_size(struct device *dev, struct device_attribute *attr, |
8564a6c1 | 411 | char *buf) |
3947be19 | 412 | { |
0c2c99b1 | 413 | return sprintf(buf, "%lx\n", get_memory_block_size()); |
3947be19 DH |
414 | } |
415 | ||
10fbcf4c | 416 | static DEVICE_ATTR(block_size_bytes, 0444, print_block_size, NULL); |
3947be19 | 417 | |
3947be19 DH |
418 | /* |
419 | * Some architectures will have custom drivers to do this, and | |
420 | * will not need to do it from userspace. The fake hot-add code | |
421 | * as well as ppc64 will do all of their discovery in userspace | |
422 | * and will require this interface. | |
423 | */ | |
424 | #ifdef CONFIG_ARCH_MEMORY_PROBE | |
425 | static ssize_t | |
10fbcf4c | 426 | memory_probe_store(struct device *dev, struct device_attribute *attr, |
28812fe1 | 427 | const char *buf, size_t count) |
3947be19 DH |
428 | { |
429 | u64 phys_addr; | |
bc02af93 | 430 | int nid; |
6add7cd6 | 431 | int i, ret; |
61b94fea | 432 | unsigned long pages_per_block = PAGES_PER_SECTION * sections_per_block; |
3947be19 DH |
433 | |
434 | phys_addr = simple_strtoull(buf, NULL, 0); | |
435 | ||
61b94fea AB |
436 | if (phys_addr & ((pages_per_block << PAGE_SHIFT) - 1)) |
437 | return -EINVAL; | |
438 | ||
6add7cd6 NF |
439 | for (i = 0; i < sections_per_block; i++) { |
440 | nid = memory_add_physaddr_to_nid(phys_addr); | |
441 | ret = add_memory(nid, phys_addr, | |
442 | PAGES_PER_SECTION << PAGE_SHIFT); | |
443 | if (ret) | |
9f0af69b | 444 | goto out; |
6add7cd6 NF |
445 | |
446 | phys_addr += MIN_MEMORY_BLOCK_SIZE; | |
447 | } | |
3947be19 | 448 | |
9f0af69b NK |
449 | ret = count; |
450 | out: | |
451 | return ret; | |
3947be19 | 452 | } |
3947be19 | 453 | |
96b2c0fc | 454 | static DEVICE_ATTR(probe, S_IWUSR, NULL, memory_probe_store); |
3947be19 DH |
455 | #endif |
456 | ||
facb6011 AK |
457 | #ifdef CONFIG_MEMORY_FAILURE |
458 | /* | |
459 | * Support for offlining pages of memory | |
460 | */ | |
461 | ||
462 | /* Soft offline a page */ | |
463 | static ssize_t | |
10fbcf4c KS |
464 | store_soft_offline_page(struct device *dev, |
465 | struct device_attribute *attr, | |
28812fe1 | 466 | const char *buf, size_t count) |
facb6011 AK |
467 | { |
468 | int ret; | |
469 | u64 pfn; | |
470 | if (!capable(CAP_SYS_ADMIN)) | |
471 | return -EPERM; | |
34da5e67 | 472 | if (kstrtoull(buf, 0, &pfn) < 0) |
facb6011 AK |
473 | return -EINVAL; |
474 | pfn >>= PAGE_SHIFT; | |
475 | if (!pfn_valid(pfn)) | |
476 | return -ENXIO; | |
477 | ret = soft_offline_page(pfn_to_page(pfn), 0); | |
478 | return ret == 0 ? count : ret; | |
479 | } | |
480 | ||
481 | /* Forcibly offline a page, including killing processes. */ | |
482 | static ssize_t | |
10fbcf4c KS |
483 | store_hard_offline_page(struct device *dev, |
484 | struct device_attribute *attr, | |
28812fe1 | 485 | const char *buf, size_t count) |
facb6011 AK |
486 | { |
487 | int ret; | |
488 | u64 pfn; | |
489 | if (!capable(CAP_SYS_ADMIN)) | |
490 | return -EPERM; | |
34da5e67 | 491 | if (kstrtoull(buf, 0, &pfn) < 0) |
facb6011 AK |
492 | return -EINVAL; |
493 | pfn >>= PAGE_SHIFT; | |
cd42f4a3 | 494 | ret = memory_failure(pfn, 0, 0); |
facb6011 AK |
495 | return ret ? ret : count; |
496 | } | |
497 | ||
74fef7a8 FB |
498 | static DEVICE_ATTR(soft_offline_page, S_IWUSR, NULL, store_soft_offline_page); |
499 | static DEVICE_ATTR(hard_offline_page, S_IWUSR, NULL, store_hard_offline_page); | |
facb6011 AK |
500 | #endif |
501 | ||
3947be19 DH |
502 | /* |
503 | * Note that phys_device is optional. It is here to allow for | |
504 | * differentiation between which *physical* devices each | |
505 | * section belongs to... | |
506 | */ | |
bc32df00 HC |
507 | int __weak arch_get_memory_phys_device(unsigned long start_pfn) |
508 | { | |
509 | return 0; | |
510 | } | |
3947be19 | 511 | |
10fbcf4c KS |
512 | /* |
513 | * A reference for the returned object is held and the reference for the | |
514 | * hinted object is released. | |
515 | */ | |
98383031 RH |
516 | struct memory_block *find_memory_block_hinted(struct mem_section *section, |
517 | struct memory_block *hint) | |
3947be19 | 518 | { |
0c2c99b1 | 519 | int block_id = base_memory_block_id(__section_nr(section)); |
10fbcf4c KS |
520 | struct device *hintdev = hint ? &hint->dev : NULL; |
521 | struct device *dev; | |
3947be19 | 522 | |
10fbcf4c KS |
523 | dev = subsys_find_device_by_id(&memory_subsys, block_id, hintdev); |
524 | if (hint) | |
525 | put_device(&hint->dev); | |
526 | if (!dev) | |
3947be19 | 527 | return NULL; |
10fbcf4c | 528 | return container_of(dev, struct memory_block, dev); |
3947be19 DH |
529 | } |
530 | ||
98383031 RH |
531 | /* |
532 | * For now, we have a linear search to go find the appropriate | |
533 | * memory_block corresponding to a particular phys_index. If | |
534 | * this gets to be a real problem, we can always use a radix | |
535 | * tree or something here. | |
536 | * | |
10fbcf4c | 537 | * This could be made generic for all device subsystems. |
98383031 RH |
538 | */ |
539 | struct memory_block *find_memory_block(struct mem_section *section) | |
540 | { | |
541 | return find_memory_block_hinted(section, NULL); | |
542 | } | |
543 | ||
96b2c0fc NF |
544 | static struct attribute *memory_memblk_attrs[] = { |
545 | &dev_attr_phys_index.attr, | |
546 | &dev_attr_end_phys_index.attr, | |
547 | &dev_attr_state.attr, | |
548 | &dev_attr_phys_device.attr, | |
549 | &dev_attr_removable.attr, | |
550 | NULL | |
551 | }; | |
552 | ||
553 | static struct attribute_group memory_memblk_attr_group = { | |
554 | .attrs = memory_memblk_attrs, | |
555 | }; | |
556 | ||
557 | static const struct attribute_group *memory_memblk_attr_groups[] = { | |
558 | &memory_memblk_attr_group, | |
559 | NULL, | |
560 | }; | |
561 | ||
562 | /* | |
563 | * register_memory - Setup a sysfs device for a memory block | |
564 | */ | |
565 | static | |
566 | int register_memory(struct memory_block *memory) | |
567 | { | |
96b2c0fc NF |
568 | memory->dev.bus = &memory_subsys; |
569 | memory->dev.id = memory->start_section_nr / sections_per_block; | |
570 | memory->dev.release = memory_block_release; | |
571 | memory->dev.groups = memory_memblk_attr_groups; | |
f991fae5 | 572 | memory->dev.offline = memory->state == MEM_OFFLINE; |
96b2c0fc | 573 | |
879f1bec | 574 | return device_register(&memory->dev); |
96b2c0fc NF |
575 | } |
576 | ||
0c2c99b1 NF |
577 | static int init_memory_block(struct memory_block **memory, |
578 | struct mem_section *section, unsigned long state) | |
e4619c85 | 579 | { |
0c2c99b1 | 580 | struct memory_block *mem; |
e4619c85 | 581 | unsigned long start_pfn; |
0c2c99b1 | 582 | int scn_nr; |
e4619c85 NF |
583 | int ret = 0; |
584 | ||
0c2c99b1 | 585 | mem = kzalloc(sizeof(*mem), GFP_KERNEL); |
e4619c85 NF |
586 | if (!mem) |
587 | return -ENOMEM; | |
588 | ||
0c2c99b1 | 589 | scn_nr = __section_nr(section); |
d3360164 NF |
590 | mem->start_section_nr = |
591 | base_memory_block_id(scn_nr) * sections_per_block; | |
592 | mem->end_section_nr = mem->start_section_nr + sections_per_block - 1; | |
e4619c85 | 593 | mem->state = state; |
07681215 | 594 | mem->section_count++; |
e4619c85 | 595 | mutex_init(&mem->state_mutex); |
d3360164 | 596 | start_pfn = section_nr_to_pfn(mem->start_section_nr); |
e4619c85 NF |
597 | mem->phys_device = arch_get_memory_phys_device(start_pfn); |
598 | ||
0c2c99b1 | 599 | ret = register_memory(mem); |
0c2c99b1 NF |
600 | |
601 | *memory = mem; | |
602 | return ret; | |
603 | } | |
604 | ||
605 | static int add_memory_section(int nid, struct mem_section *section, | |
321bf4ed | 606 | struct memory_block **mem_p, |
0c2c99b1 NF |
607 | unsigned long state, enum mem_add_context context) |
608 | { | |
321bf4ed YL |
609 | struct memory_block *mem = NULL; |
610 | int scn_nr = __section_nr(section); | |
0c2c99b1 NF |
611 | int ret = 0; |
612 | ||
321bf4ed YL |
613 | if (context == BOOT) { |
614 | /* same memory block ? */ | |
615 | if (mem_p && *mem_p) | |
616 | if (scn_nr >= (*mem_p)->start_section_nr && | |
617 | scn_nr <= (*mem_p)->end_section_nr) { | |
618 | mem = *mem_p; | |
619 | kobject_get(&mem->dev.kobj); | |
620 | } | |
621 | } else | |
622 | mem = find_memory_block(section); | |
623 | ||
0c2c99b1 NF |
624 | if (mem) { |
625 | mem->section_count++; | |
10fbcf4c | 626 | kobject_put(&mem->dev.kobj); |
321bf4ed | 627 | } else { |
0c2c99b1 | 628 | ret = init_memory_block(&mem, section, state); |
321bf4ed YL |
629 | /* store memory_block pointer for next loop */ |
630 | if (!ret && context == BOOT) | |
631 | if (mem_p) | |
632 | *mem_p = mem; | |
633 | } | |
0c2c99b1 | 634 | |
e4619c85 | 635 | if (!ret) { |
0c2c99b1 NF |
636 | if (context == HOTPLUG && |
637 | mem->section_count == sections_per_block) | |
e4619c85 NF |
638 | ret = register_mem_sect_under_node(mem, nid); |
639 | } | |
640 | ||
641 | return ret; | |
642 | } | |
643 | ||
4edd7cef DR |
644 | /* |
645 | * need an interface for the VM to add new memory regions, | |
646 | * but without onlining it. | |
647 | */ | |
648 | int register_new_memory(int nid, struct mem_section *section) | |
649 | { | |
b1eaef3d SJ |
650 | int ret; |
651 | ||
652 | mutex_lock(&mem_sysfs_mutex); | |
653 | ret = add_memory_section(nid, section, NULL, MEM_OFFLINE, HOTPLUG); | |
654 | mutex_unlock(&mem_sysfs_mutex); | |
655 | ||
656 | return ret; | |
4edd7cef DR |
657 | } |
658 | ||
659 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
660 | static void | |
661 | unregister_memory(struct memory_block *memory) | |
662 | { | |
663 | BUG_ON(memory->dev.bus != &memory_subsys); | |
664 | ||
665 | /* drop the ref. we got in remove_memory_block() */ | |
666 | kobject_put(&memory->dev.kobj); | |
667 | device_unregister(&memory->dev); | |
668 | } | |
669 | ||
670 | static int remove_memory_block(unsigned long node_id, | |
671 | struct mem_section *section, int phys_device) | |
3947be19 DH |
672 | { |
673 | struct memory_block *mem; | |
674 | ||
2938ffbd | 675 | mutex_lock(&mem_sysfs_mutex); |
3947be19 | 676 | mem = find_memory_block(section); |
d3360164 | 677 | unregister_mem_sect_under_nodes(mem, __section_nr(section)); |
07681215 NF |
678 | |
679 | mem->section_count--; | |
96b2c0fc | 680 | if (mem->section_count == 0) |
0c2c99b1 | 681 | unregister_memory(mem); |
96b2c0fc | 682 | else |
10fbcf4c | 683 | kobject_put(&mem->dev.kobj); |
3947be19 | 684 | |
2938ffbd | 685 | mutex_unlock(&mem_sysfs_mutex); |
3947be19 DH |
686 | return 0; |
687 | } | |
688 | ||
3947be19 DH |
689 | int unregister_memory_section(struct mem_section *section) |
690 | { | |
540557b9 | 691 | if (!present_section(section)) |
3947be19 DH |
692 | return -EINVAL; |
693 | ||
694 | return remove_memory_block(0, section, 0); | |
695 | } | |
4edd7cef | 696 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
3947be19 | 697 | |
6677e3ea YI |
698 | /* return true if the memory block is offlined, otherwise, return false */ |
699 | bool is_memblock_offlined(struct memory_block *mem) | |
700 | { | |
701 | return mem->state == MEM_OFFLINE; | |
702 | } | |
703 | ||
96b2c0fc NF |
704 | static struct attribute *memory_root_attrs[] = { |
705 | #ifdef CONFIG_ARCH_MEMORY_PROBE | |
706 | &dev_attr_probe.attr, | |
707 | #endif | |
708 | ||
709 | #ifdef CONFIG_MEMORY_FAILURE | |
710 | &dev_attr_soft_offline_page.attr, | |
711 | &dev_attr_hard_offline_page.attr, | |
712 | #endif | |
713 | ||
714 | &dev_attr_block_size_bytes.attr, | |
715 | NULL | |
716 | }; | |
717 | ||
718 | static struct attribute_group memory_root_attr_group = { | |
719 | .attrs = memory_root_attrs, | |
720 | }; | |
721 | ||
722 | static const struct attribute_group *memory_root_attr_groups[] = { | |
723 | &memory_root_attr_group, | |
724 | NULL, | |
725 | }; | |
726 | ||
3947be19 DH |
727 | /* |
728 | * Initialize the sysfs support for memory devices... | |
729 | */ | |
730 | int __init memory_dev_init(void) | |
731 | { | |
732 | unsigned int i; | |
733 | int ret; | |
28ec24e2 | 734 | int err; |
0c2c99b1 | 735 | unsigned long block_sz; |
321bf4ed | 736 | struct memory_block *mem = NULL; |
3947be19 | 737 | |
96b2c0fc | 738 | ret = subsys_system_register(&memory_subsys, memory_root_attr_groups); |
28ec24e2 AM |
739 | if (ret) |
740 | goto out; | |
3947be19 | 741 | |
0c2c99b1 NF |
742 | block_sz = get_memory_block_size(); |
743 | sections_per_block = block_sz / MIN_MEMORY_BLOCK_SIZE; | |
744 | ||
3947be19 DH |
745 | /* |
746 | * Create entries for memory sections that were found | |
747 | * during boot and have been initialized | |
748 | */ | |
b1eaef3d | 749 | mutex_lock(&mem_sysfs_mutex); |
3947be19 | 750 | for (i = 0; i < NR_MEM_SECTIONS; i++) { |
540557b9 | 751 | if (!present_section_nr(i)) |
3947be19 | 752 | continue; |
321bf4ed YL |
753 | /* don't need to reuse memory_block if only one per block */ |
754 | err = add_memory_section(0, __nr_to_section(i), | |
755 | (sections_per_block == 1) ? NULL : &mem, | |
756 | MEM_ONLINE, | |
0c2c99b1 | 757 | BOOT); |
28ec24e2 AM |
758 | if (!ret) |
759 | ret = err; | |
3947be19 | 760 | } |
b1eaef3d | 761 | mutex_unlock(&mem_sysfs_mutex); |
3947be19 | 762 | |
28ec24e2 AM |
763 | out: |
764 | if (ret) | |
2b3a302a | 765 | printk(KERN_ERR "%s() failed: %d\n", __func__, ret); |
3947be19 DH |
766 | return ret; |
767 | } |