Commit | Line | Data |
---|---|---|
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> | |
3947be19 DH |
19 | #include <linux/memory_hotplug.h> |
20 | #include <linux/mm.h> | |
da19cbcf | 21 | #include <linux/mutex.h> |
9f1b16a5 | 22 | #include <linux/stat.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
9f1b16a5 | 24 | |
60063497 | 25 | #include <linux/atomic.h> |
3947be19 DH |
26 | #include <asm/uaccess.h> |
27 | ||
2938ffbd NF |
28 | static DEFINE_MUTEX(mem_sysfs_mutex); |
29 | ||
3947be19 | 30 | #define MEMORY_CLASS_NAME "memory" |
0c2c99b1 | 31 | |
7315f0cc GZ |
32 | #define to_memory_block(dev) container_of(dev, struct memory_block, dev) |
33 | ||
0c2c99b1 NF |
34 | static int sections_per_block; |
35 | ||
36 | static inline int base_memory_block_id(int section_nr) | |
37 | { | |
38 | return section_nr / sections_per_block; | |
39 | } | |
3947be19 | 40 | |
4960e05e RW |
41 | static int memory_subsys_online(struct device *dev); |
42 | static int memory_subsys_offline(struct device *dev); | |
43 | ||
10fbcf4c | 44 | static struct bus_type memory_subsys = { |
af5ca3f4 | 45 | .name = MEMORY_CLASS_NAME, |
10fbcf4c | 46 | .dev_name = MEMORY_CLASS_NAME, |
4960e05e RW |
47 | .online = memory_subsys_online, |
48 | .offline = memory_subsys_offline, | |
3947be19 DH |
49 | }; |
50 | ||
e041c683 | 51 | static BLOCKING_NOTIFIER_HEAD(memory_chain); |
3947be19 | 52 | |
98a38ebd | 53 | int register_memory_notifier(struct notifier_block *nb) |
3947be19 | 54 | { |
e041c683 | 55 | return blocking_notifier_chain_register(&memory_chain, nb); |
3947be19 | 56 | } |
3c82c30c | 57 | EXPORT_SYMBOL(register_memory_notifier); |
3947be19 | 58 | |
98a38ebd | 59 | void unregister_memory_notifier(struct notifier_block *nb) |
3947be19 | 60 | { |
e041c683 | 61 | blocking_notifier_chain_unregister(&memory_chain, nb); |
3947be19 | 62 | } |
3c82c30c | 63 | EXPORT_SYMBOL(unregister_memory_notifier); |
3947be19 | 64 | |
925cc71e RJ |
65 | static ATOMIC_NOTIFIER_HEAD(memory_isolate_chain); |
66 | ||
67 | int register_memory_isolate_notifier(struct notifier_block *nb) | |
68 | { | |
69 | return atomic_notifier_chain_register(&memory_isolate_chain, nb); | |
70 | } | |
71 | EXPORT_SYMBOL(register_memory_isolate_notifier); | |
72 | ||
73 | void unregister_memory_isolate_notifier(struct notifier_block *nb) | |
74 | { | |
75 | atomic_notifier_chain_unregister(&memory_isolate_chain, nb); | |
76 | } | |
77 | EXPORT_SYMBOL(unregister_memory_isolate_notifier); | |
78 | ||
fa7194eb YI |
79 | static void memory_block_release(struct device *dev) |
80 | { | |
7315f0cc | 81 | struct memory_block *mem = to_memory_block(dev); |
fa7194eb YI |
82 | |
83 | kfree(mem); | |
84 | } | |
85 | ||
0c2c99b1 NF |
86 | unsigned long __weak memory_block_size_bytes(void) |
87 | { | |
88 | return MIN_MEMORY_BLOCK_SIZE; | |
89 | } | |
90 | ||
91 | static unsigned long get_memory_block_size(void) | |
92 | { | |
93 | unsigned long block_sz; | |
94 | ||
95 | block_sz = memory_block_size_bytes(); | |
96 | ||
97 | /* Validate blk_sz is a power of 2 and not less than section size */ | |
98 | if ((block_sz & (block_sz - 1)) || (block_sz < MIN_MEMORY_BLOCK_SIZE)) { | |
99 | WARN_ON(1); | |
100 | block_sz = MIN_MEMORY_BLOCK_SIZE; | |
101 | } | |
102 | ||
103 | return block_sz; | |
104 | } | |
105 | ||
3947be19 DH |
106 | /* |
107 | * use this as the physical section index that this memsection | |
108 | * uses. | |
109 | */ | |
110 | ||
10fbcf4c KS |
111 | static ssize_t show_mem_start_phys_index(struct device *dev, |
112 | struct device_attribute *attr, char *buf) | |
3947be19 | 113 | { |
7315f0cc | 114 | struct memory_block *mem = to_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 | 123 | { |
7315f0cc | 124 | struct memory_block *mem = to_memory_block(dev); |
d3360164 NF |
125 | unsigned long phys_index; |
126 | ||
127 | phys_index = mem->end_section_nr / sections_per_block; | |
128 | return sprintf(buf, "%08lx\n", phys_index); | |
3947be19 DH |
129 | } |
130 | ||
5c755e9f BP |
131 | /* |
132 | * Show whether the section of memory is likely to be hot-removable | |
133 | */ | |
10fbcf4c KS |
134 | static ssize_t show_mem_removable(struct device *dev, |
135 | struct device_attribute *attr, char *buf) | |
5c755e9f | 136 | { |
0c2c99b1 NF |
137 | unsigned long i, pfn; |
138 | int ret = 1; | |
7315f0cc | 139 | struct memory_block *mem = to_memory_block(dev); |
5c755e9f | 140 | |
0c2c99b1 | 141 | for (i = 0; i < sections_per_block; i++) { |
21ea9f5a RA |
142 | if (!present_section_nr(mem->start_section_nr + i)) |
143 | continue; | |
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 | 156 | { |
7315f0cc | 157 | struct memory_block *mem = to_memory_block(dev); |
3947be19 DH |
158 | ssize_t len = 0; |
159 | ||
160 | /* | |
161 | * We can probably put these states in a nice little array | |
162 | * so that they're not open-coded | |
163 | */ | |
164 | switch (mem->state) { | |
165 | case MEM_ONLINE: | |
166 | len = sprintf(buf, "online\n"); | |
167 | break; | |
168 | case MEM_OFFLINE: | |
169 | len = sprintf(buf, "offline\n"); | |
170 | break; | |
171 | case MEM_GOING_OFFLINE: | |
172 | len = sprintf(buf, "going-offline\n"); | |
173 | break; | |
174 | default: | |
175 | len = sprintf(buf, "ERROR-UNKNOWN-%ld\n", | |
176 | mem->state); | |
177 | WARN_ON(1); | |
178 | break; | |
179 | } | |
180 | ||
181 | return len; | |
182 | } | |
183 | ||
7b78d335 | 184 | int memory_notify(unsigned long val, void *v) |
3947be19 | 185 | { |
e041c683 | 186 | return blocking_notifier_call_chain(&memory_chain, val, v); |
3947be19 DH |
187 | } |
188 | ||
925cc71e RJ |
189 | int memory_isolate_notify(unsigned long val, void *v) |
190 | { | |
191 | return atomic_notifier_call_chain(&memory_isolate_chain, val, v); | |
192 | } | |
193 | ||
2bbcb878 MG |
194 | /* |
195 | * The probe routines leave the pages reserved, just as the bootmem code does. | |
196 | * Make sure they're still that way. | |
197 | */ | |
6056d619 | 198 | static bool pages_correctly_reserved(unsigned long start_pfn) |
2bbcb878 MG |
199 | { |
200 | int i, j; | |
201 | struct page *page; | |
202 | unsigned long pfn = start_pfn; | |
203 | ||
204 | /* | |
205 | * memmap between sections is not contiguous except with | |
206 | * SPARSEMEM_VMEMMAP. We lookup the page once per section | |
207 | * and assume memmap is contiguous within each section | |
208 | */ | |
209 | for (i = 0; i < sections_per_block; i++, pfn += PAGES_PER_SECTION) { | |
210 | if (WARN_ON_ONCE(!pfn_valid(pfn))) | |
211 | return false; | |
212 | page = pfn_to_page(pfn); | |
213 | ||
214 | for (j = 0; j < PAGES_PER_SECTION; j++) { | |
215 | if (PageReserved(page + j)) | |
216 | continue; | |
217 | ||
218 | printk(KERN_WARNING "section number %ld page number %d " | |
219 | "not reserved, was it already online?\n", | |
220 | pfn_to_section_nr(pfn), j); | |
221 | ||
222 | return false; | |
223 | } | |
224 | } | |
225 | ||
226 | return true; | |
227 | } | |
228 | ||
3947be19 DH |
229 | /* |
230 | * MEMORY_HOTPLUG depends on SPARSEMEM in mm/Kconfig, so it is | |
231 | * OK to have direct references to sparsemem variables in here. | |
232 | */ | |
233 | static int | |
511c2aba | 234 | memory_block_action(unsigned long phys_index, unsigned long action, int online_type) |
3947be19 | 235 | { |
a16cee10 | 236 | unsigned long start_pfn; |
5409d2cd | 237 | unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block; |
de0ed36a | 238 | struct page *first_page; |
3947be19 | 239 | int ret; |
3947be19 | 240 | |
de0ed36a | 241 | first_page = pfn_to_page(phys_index << PFN_SECTION_SHIFT); |
a16cee10 | 242 | start_pfn = page_to_pfn(first_page); |
de0ed36a | 243 | |
3947be19 DH |
244 | switch (action) { |
245 | case MEM_ONLINE: | |
6056d619 | 246 | if (!pages_correctly_reserved(start_pfn)) |
2bbcb878 MG |
247 | return -EBUSY; |
248 | ||
511c2aba | 249 | ret = online_pages(start_pfn, nr_pages, online_type); |
3947be19 DH |
250 | break; |
251 | case MEM_OFFLINE: | |
a16cee10 | 252 | ret = offline_pages(start_pfn, nr_pages); |
3947be19 DH |
253 | break; |
254 | default: | |
0c2c99b1 NF |
255 | WARN(1, KERN_WARNING "%s(%ld, %ld) unknown action: " |
256 | "%ld\n", __func__, phys_index, action, action); | |
3947be19 DH |
257 | ret = -EINVAL; |
258 | } | |
3947be19 DH |
259 | |
260 | return ret; | |
261 | } | |
262 | ||
fa2be40f SJ |
263 | static int memory_block_change_state(struct memory_block *mem, |
264 | unsigned long to_state, unsigned long from_state_req) | |
3947be19 | 265 | { |
de0ed36a | 266 | int ret = 0; |
0c2c99b1 | 267 | |
4960e05e RW |
268 | if (mem->state != from_state_req) |
269 | return -EINVAL; | |
3947be19 | 270 | |
0c2c99b1 NF |
271 | if (to_state == MEM_OFFLINE) |
272 | mem->state = MEM_GOING_OFFLINE; | |
273 | ||
fa2be40f SJ |
274 | ret = memory_block_action(mem->start_section_nr, to_state, |
275 | mem->online_type); | |
276 | ||
b2c064b2 | 277 | mem->state = ret ? from_state_req : to_state; |
fa2be40f | 278 | |
4960e05e RW |
279 | return ret; |
280 | } | |
0c2c99b1 | 281 | |
fa2be40f | 282 | /* The device lock serializes operations on memory_subsys_[online|offline] */ |
4960e05e RW |
283 | static int memory_subsys_online(struct device *dev) |
284 | { | |
7315f0cc | 285 | struct memory_block *mem = to_memory_block(dev); |
4960e05e | 286 | int ret; |
3947be19 | 287 | |
fa2be40f SJ |
288 | if (mem->state == MEM_ONLINE) |
289 | return 0; | |
4960e05e | 290 | |
fa2be40f SJ |
291 | /* |
292 | * If we are called from store_mem_state(), online_type will be | |
293 | * set >= 0 Otherwise we were called from the device online | |
294 | * attribute and need to set the online_type. | |
295 | */ | |
296 | if (mem->online_type < 0) | |
297 | mem->online_type = ONLINE_KEEP; | |
4960e05e | 298 | |
fa2be40f | 299 | ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE); |
4960e05e | 300 | |
fa2be40f SJ |
301 | /* clear online_type */ |
302 | mem->online_type = -1; | |
4960e05e | 303 | |
4960e05e RW |
304 | return ret; |
305 | } | |
306 | ||
4960e05e | 307 | static int memory_subsys_offline(struct device *dev) |
e90bdb7f | 308 | { |
7315f0cc | 309 | struct memory_block *mem = to_memory_block(dev); |
e90bdb7f | 310 | |
fa2be40f SJ |
311 | if (mem->state == MEM_OFFLINE) |
312 | return 0; | |
e90bdb7f | 313 | |
fa2be40f | 314 | return memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE); |
e90bdb7f | 315 | } |
4960e05e | 316 | |
3947be19 | 317 | static ssize_t |
10fbcf4c KS |
318 | store_mem_state(struct device *dev, |
319 | struct device_attribute *attr, const char *buf, size_t count) | |
3947be19 | 320 | { |
7315f0cc | 321 | struct memory_block *mem = to_memory_block(dev); |
fa2be40f | 322 | int ret, online_type; |
3947be19 | 323 | |
5e33bc41 RW |
324 | ret = lock_device_hotplug_sysfs(); |
325 | if (ret) | |
326 | return ret; | |
4960e05e | 327 | |
fa2be40f SJ |
328 | if (!strncmp(buf, "online_kernel", min_t(int, count, 13))) |
329 | online_type = ONLINE_KERNEL; | |
330 | else if (!strncmp(buf, "online_movable", min_t(int, count, 14))) | |
331 | online_type = ONLINE_MOVABLE; | |
332 | else if (!strncmp(buf, "online", min_t(int, count, 6))) | |
333 | online_type = ONLINE_KEEP; | |
334 | else if (!strncmp(buf, "offline", min_t(int, count, 7))) | |
335 | online_type = -1; | |
336 | else | |
337 | return -EINVAL; | |
338 | ||
339 | switch (online_type) { | |
340 | case ONLINE_KERNEL: | |
341 | case ONLINE_MOVABLE: | |
342 | case ONLINE_KEEP: | |
343 | /* | |
344 | * mem->online_type is not protected so there can be a | |
345 | * race here. However, when racing online, the first | |
346 | * will succeed and the second will just return as the | |
347 | * block will already be online. The online type | |
348 | * could be either one, but that is expected. | |
349 | */ | |
350 | mem->online_type = online_type; | |
351 | ret = device_online(&mem->dev); | |
352 | break; | |
353 | case -1: | |
354 | ret = device_offline(&mem->dev); | |
355 | break; | |
356 | default: | |
357 | ret = -EINVAL; /* should never happen */ | |
4960e05e | 358 | } |
4960e05e RW |
359 | |
360 | unlock_device_hotplug(); | |
0c2c99b1 | 361 | |
3947be19 DH |
362 | if (ret) |
363 | return ret; | |
364 | return count; | |
365 | } | |
366 | ||
367 | /* | |
368 | * phys_device is a bad name for this. What I really want | |
369 | * is a way to differentiate between memory ranges that | |
370 | * are part of physical devices that constitute | |
371 | * a complete removable unit or fru. | |
372 | * i.e. do these ranges belong to the same physical device, | |
373 | * s.t. if I offline all of these sections I can then | |
374 | * remove the physical device? | |
375 | */ | |
10fbcf4c KS |
376 | static ssize_t show_phys_device(struct device *dev, |
377 | struct device_attribute *attr, char *buf) | |
3947be19 | 378 | { |
7315f0cc | 379 | struct memory_block *mem = to_memory_block(dev); |
3947be19 DH |
380 | return sprintf(buf, "%d\n", mem->phys_device); |
381 | } | |
382 | ||
10fbcf4c KS |
383 | static DEVICE_ATTR(phys_index, 0444, show_mem_start_phys_index, NULL); |
384 | static DEVICE_ATTR(end_phys_index, 0444, show_mem_end_phys_index, NULL); | |
385 | static DEVICE_ATTR(state, 0644, show_mem_state, store_mem_state); | |
386 | static DEVICE_ATTR(phys_device, 0444, show_phys_device, NULL); | |
387 | static DEVICE_ATTR(removable, 0444, show_mem_removable, NULL); | |
3947be19 | 388 | |
3947be19 DH |
389 | /* |
390 | * Block size attribute stuff | |
391 | */ | |
392 | static ssize_t | |
10fbcf4c | 393 | print_block_size(struct device *dev, struct device_attribute *attr, |
8564a6c1 | 394 | char *buf) |
3947be19 | 395 | { |
0c2c99b1 | 396 | return sprintf(buf, "%lx\n", get_memory_block_size()); |
3947be19 DH |
397 | } |
398 | ||
10fbcf4c | 399 | static DEVICE_ATTR(block_size_bytes, 0444, print_block_size, NULL); |
3947be19 | 400 | |
3947be19 DH |
401 | /* |
402 | * Some architectures will have custom drivers to do this, and | |
403 | * will not need to do it from userspace. The fake hot-add code | |
404 | * as well as ppc64 will do all of their discovery in userspace | |
405 | * and will require this interface. | |
406 | */ | |
407 | #ifdef CONFIG_ARCH_MEMORY_PROBE | |
408 | static ssize_t | |
10fbcf4c | 409 | memory_probe_store(struct device *dev, struct device_attribute *attr, |
28812fe1 | 410 | const char *buf, size_t count) |
3947be19 DH |
411 | { |
412 | u64 phys_addr; | |
bc02af93 | 413 | int nid; |
6add7cd6 | 414 | int i, ret; |
61b94fea | 415 | unsigned long pages_per_block = PAGES_PER_SECTION * sections_per_block; |
3947be19 DH |
416 | |
417 | phys_addr = simple_strtoull(buf, NULL, 0); | |
418 | ||
61b94fea AB |
419 | if (phys_addr & ((pages_per_block << PAGE_SHIFT) - 1)) |
420 | return -EINVAL; | |
421 | ||
6add7cd6 NF |
422 | for (i = 0; i < sections_per_block; i++) { |
423 | nid = memory_add_physaddr_to_nid(phys_addr); | |
424 | ret = add_memory(nid, phys_addr, | |
425 | PAGES_PER_SECTION << PAGE_SHIFT); | |
426 | if (ret) | |
9f0af69b | 427 | goto out; |
6add7cd6 NF |
428 | |
429 | phys_addr += MIN_MEMORY_BLOCK_SIZE; | |
430 | } | |
3947be19 | 431 | |
9f0af69b NK |
432 | ret = count; |
433 | out: | |
434 | return ret; | |
3947be19 | 435 | } |
3947be19 | 436 | |
96b2c0fc | 437 | static DEVICE_ATTR(probe, S_IWUSR, NULL, memory_probe_store); |
3947be19 DH |
438 | #endif |
439 | ||
facb6011 AK |
440 | #ifdef CONFIG_MEMORY_FAILURE |
441 | /* | |
442 | * Support for offlining pages of memory | |
443 | */ | |
444 | ||
445 | /* Soft offline a page */ | |
446 | static ssize_t | |
10fbcf4c KS |
447 | store_soft_offline_page(struct device *dev, |
448 | struct device_attribute *attr, | |
28812fe1 | 449 | const char *buf, size_t count) |
facb6011 AK |
450 | { |
451 | int ret; | |
452 | u64 pfn; | |
453 | if (!capable(CAP_SYS_ADMIN)) | |
454 | return -EPERM; | |
34da5e67 | 455 | if (kstrtoull(buf, 0, &pfn) < 0) |
facb6011 AK |
456 | return -EINVAL; |
457 | pfn >>= PAGE_SHIFT; | |
458 | if (!pfn_valid(pfn)) | |
459 | return -ENXIO; | |
460 | ret = soft_offline_page(pfn_to_page(pfn), 0); | |
461 | return ret == 0 ? count : ret; | |
462 | } | |
463 | ||
464 | /* Forcibly offline a page, including killing processes. */ | |
465 | static ssize_t | |
10fbcf4c KS |
466 | store_hard_offline_page(struct device *dev, |
467 | struct device_attribute *attr, | |
28812fe1 | 468 | const char *buf, size_t count) |
facb6011 AK |
469 | { |
470 | int ret; | |
471 | u64 pfn; | |
472 | if (!capable(CAP_SYS_ADMIN)) | |
473 | return -EPERM; | |
34da5e67 | 474 | if (kstrtoull(buf, 0, &pfn) < 0) |
facb6011 AK |
475 | return -EINVAL; |
476 | pfn >>= PAGE_SHIFT; | |
cd42f4a3 | 477 | ret = memory_failure(pfn, 0, 0); |
facb6011 AK |
478 | return ret ? ret : count; |
479 | } | |
480 | ||
74fef7a8 FB |
481 | static DEVICE_ATTR(soft_offline_page, S_IWUSR, NULL, store_soft_offline_page); |
482 | static DEVICE_ATTR(hard_offline_page, S_IWUSR, NULL, store_hard_offline_page); | |
facb6011 AK |
483 | #endif |
484 | ||
3947be19 DH |
485 | /* |
486 | * Note that phys_device is optional. It is here to allow for | |
487 | * differentiation between which *physical* devices each | |
488 | * section belongs to... | |
489 | */ | |
bc32df00 HC |
490 | int __weak arch_get_memory_phys_device(unsigned long start_pfn) |
491 | { | |
492 | return 0; | |
493 | } | |
3947be19 | 494 | |
10fbcf4c KS |
495 | /* |
496 | * A reference for the returned object is held and the reference for the | |
497 | * hinted object is released. | |
498 | */ | |
98383031 RH |
499 | struct memory_block *find_memory_block_hinted(struct mem_section *section, |
500 | struct memory_block *hint) | |
3947be19 | 501 | { |
0c2c99b1 | 502 | int block_id = base_memory_block_id(__section_nr(section)); |
10fbcf4c KS |
503 | struct device *hintdev = hint ? &hint->dev : NULL; |
504 | struct device *dev; | |
3947be19 | 505 | |
10fbcf4c KS |
506 | dev = subsys_find_device_by_id(&memory_subsys, block_id, hintdev); |
507 | if (hint) | |
508 | put_device(&hint->dev); | |
509 | if (!dev) | |
3947be19 | 510 | return NULL; |
7315f0cc | 511 | return to_memory_block(dev); |
3947be19 DH |
512 | } |
513 | ||
98383031 RH |
514 | /* |
515 | * For now, we have a linear search to go find the appropriate | |
516 | * memory_block corresponding to a particular phys_index. If | |
517 | * this gets to be a real problem, we can always use a radix | |
518 | * tree or something here. | |
519 | * | |
10fbcf4c | 520 | * This could be made generic for all device subsystems. |
98383031 RH |
521 | */ |
522 | struct memory_block *find_memory_block(struct mem_section *section) | |
523 | { | |
524 | return find_memory_block_hinted(section, NULL); | |
525 | } | |
526 | ||
96b2c0fc NF |
527 | static struct attribute *memory_memblk_attrs[] = { |
528 | &dev_attr_phys_index.attr, | |
529 | &dev_attr_end_phys_index.attr, | |
530 | &dev_attr_state.attr, | |
531 | &dev_attr_phys_device.attr, | |
532 | &dev_attr_removable.attr, | |
533 | NULL | |
534 | }; | |
535 | ||
536 | static struct attribute_group memory_memblk_attr_group = { | |
537 | .attrs = memory_memblk_attrs, | |
538 | }; | |
539 | ||
540 | static const struct attribute_group *memory_memblk_attr_groups[] = { | |
541 | &memory_memblk_attr_group, | |
542 | NULL, | |
543 | }; | |
544 | ||
545 | /* | |
546 | * register_memory - Setup a sysfs device for a memory block | |
547 | */ | |
548 | static | |
549 | int register_memory(struct memory_block *memory) | |
550 | { | |
96b2c0fc NF |
551 | memory->dev.bus = &memory_subsys; |
552 | memory->dev.id = memory->start_section_nr / sections_per_block; | |
553 | memory->dev.release = memory_block_release; | |
554 | memory->dev.groups = memory_memblk_attr_groups; | |
f991fae5 | 555 | memory->dev.offline = memory->state == MEM_OFFLINE; |
96b2c0fc | 556 | |
879f1bec | 557 | return device_register(&memory->dev); |
96b2c0fc NF |
558 | } |
559 | ||
0c2c99b1 NF |
560 | static int init_memory_block(struct memory_block **memory, |
561 | struct mem_section *section, unsigned long state) | |
e4619c85 | 562 | { |
0c2c99b1 | 563 | struct memory_block *mem; |
e4619c85 | 564 | unsigned long start_pfn; |
0c2c99b1 | 565 | int scn_nr; |
e4619c85 NF |
566 | int ret = 0; |
567 | ||
0c2c99b1 | 568 | mem = kzalloc(sizeof(*mem), GFP_KERNEL); |
e4619c85 NF |
569 | if (!mem) |
570 | return -ENOMEM; | |
571 | ||
0c2c99b1 | 572 | scn_nr = __section_nr(section); |
d3360164 NF |
573 | mem->start_section_nr = |
574 | base_memory_block_id(scn_nr) * sections_per_block; | |
575 | mem->end_section_nr = mem->start_section_nr + sections_per_block - 1; | |
e4619c85 | 576 | mem->state = state; |
07681215 | 577 | mem->section_count++; |
d3360164 | 578 | start_pfn = section_nr_to_pfn(mem->start_section_nr); |
e4619c85 NF |
579 | mem->phys_device = arch_get_memory_phys_device(start_pfn); |
580 | ||
0c2c99b1 | 581 | ret = register_memory(mem); |
0c2c99b1 NF |
582 | |
583 | *memory = mem; | |
584 | return ret; | |
585 | } | |
586 | ||
cb5e39b8 | 587 | static int add_memory_block(int base_section_nr) |
0c2c99b1 | 588 | { |
cb5e39b8 SJ |
589 | struct memory_block *mem; |
590 | int i, ret, section_count = 0, section_nr; | |
0c2c99b1 | 591 | |
cb5e39b8 SJ |
592 | for (i = base_section_nr; |
593 | (i < base_section_nr + sections_per_block) && i < NR_MEM_SECTIONS; | |
594 | i++) { | |
595 | if (!present_section_nr(i)) | |
596 | continue; | |
597 | if (section_count == 0) | |
598 | section_nr = i; | |
599 | section_count++; | |
e4619c85 NF |
600 | } |
601 | ||
cb5e39b8 SJ |
602 | if (section_count == 0) |
603 | return 0; | |
604 | ret = init_memory_block(&mem, __nr_to_section(section_nr), MEM_ONLINE); | |
605 | if (ret) | |
606 | return ret; | |
607 | mem->section_count = section_count; | |
608 | return 0; | |
e4619c85 NF |
609 | } |
610 | ||
cb5e39b8 | 611 | |
4edd7cef DR |
612 | /* |
613 | * need an interface for the VM to add new memory regions, | |
614 | * but without onlining it. | |
615 | */ | |
616 | int register_new_memory(int nid, struct mem_section *section) | |
617 | { | |
d7f80530 SJ |
618 | int ret = 0; |
619 | struct memory_block *mem; | |
b1eaef3d SJ |
620 | |
621 | mutex_lock(&mem_sysfs_mutex); | |
b1eaef3d | 622 | |
d7f80530 SJ |
623 | mem = find_memory_block(section); |
624 | if (mem) { | |
625 | mem->section_count++; | |
626 | put_device(&mem->dev); | |
627 | } else { | |
628 | ret = init_memory_block(&mem, section, MEM_OFFLINE); | |
629 | if (ret) | |
630 | goto out; | |
631 | } | |
632 | ||
633 | if (mem->section_count == sections_per_block) | |
634 | ret = register_mem_sect_under_node(mem, nid); | |
635 | out: | |
636 | mutex_unlock(&mem_sysfs_mutex); | |
b1eaef3d | 637 | return ret; |
4edd7cef DR |
638 | } |
639 | ||
640 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
641 | static void | |
642 | unregister_memory(struct memory_block *memory) | |
643 | { | |
644 | BUG_ON(memory->dev.bus != &memory_subsys); | |
645 | ||
646 | /* drop the ref. we got in remove_memory_block() */ | |
df2b717c | 647 | put_device(&memory->dev); |
4edd7cef DR |
648 | device_unregister(&memory->dev); |
649 | } | |
650 | ||
651 | static int remove_memory_block(unsigned long node_id, | |
652 | struct mem_section *section, int phys_device) | |
3947be19 DH |
653 | { |
654 | struct memory_block *mem; | |
655 | ||
2938ffbd | 656 | mutex_lock(&mem_sysfs_mutex); |
3947be19 | 657 | mem = find_memory_block(section); |
d3360164 | 658 | unregister_mem_sect_under_nodes(mem, __section_nr(section)); |
07681215 NF |
659 | |
660 | mem->section_count--; | |
96b2c0fc | 661 | if (mem->section_count == 0) |
0c2c99b1 | 662 | unregister_memory(mem); |
96b2c0fc | 663 | else |
df2b717c | 664 | put_device(&mem->dev); |
3947be19 | 665 | |
2938ffbd | 666 | mutex_unlock(&mem_sysfs_mutex); |
3947be19 DH |
667 | return 0; |
668 | } | |
669 | ||
3947be19 DH |
670 | int unregister_memory_section(struct mem_section *section) |
671 | { | |
540557b9 | 672 | if (!present_section(section)) |
3947be19 DH |
673 | return -EINVAL; |
674 | ||
675 | return remove_memory_block(0, section, 0); | |
676 | } | |
4edd7cef | 677 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
3947be19 | 678 | |
6677e3ea YI |
679 | /* return true if the memory block is offlined, otherwise, return false */ |
680 | bool is_memblock_offlined(struct memory_block *mem) | |
681 | { | |
682 | return mem->state == MEM_OFFLINE; | |
683 | } | |
684 | ||
96b2c0fc NF |
685 | static struct attribute *memory_root_attrs[] = { |
686 | #ifdef CONFIG_ARCH_MEMORY_PROBE | |
687 | &dev_attr_probe.attr, | |
688 | #endif | |
689 | ||
690 | #ifdef CONFIG_MEMORY_FAILURE | |
691 | &dev_attr_soft_offline_page.attr, | |
692 | &dev_attr_hard_offline_page.attr, | |
693 | #endif | |
694 | ||
695 | &dev_attr_block_size_bytes.attr, | |
696 | NULL | |
697 | }; | |
698 | ||
699 | static struct attribute_group memory_root_attr_group = { | |
700 | .attrs = memory_root_attrs, | |
701 | }; | |
702 | ||
703 | static const struct attribute_group *memory_root_attr_groups[] = { | |
704 | &memory_root_attr_group, | |
705 | NULL, | |
706 | }; | |
707 | ||
3947be19 DH |
708 | /* |
709 | * Initialize the sysfs support for memory devices... | |
710 | */ | |
711 | int __init memory_dev_init(void) | |
712 | { | |
713 | unsigned int i; | |
714 | int ret; | |
28ec24e2 | 715 | int err; |
0c2c99b1 | 716 | unsigned long block_sz; |
3947be19 | 717 | |
96b2c0fc | 718 | ret = subsys_system_register(&memory_subsys, memory_root_attr_groups); |
28ec24e2 AM |
719 | if (ret) |
720 | goto out; | |
3947be19 | 721 | |
0c2c99b1 NF |
722 | block_sz = get_memory_block_size(); |
723 | sections_per_block = block_sz / MIN_MEMORY_BLOCK_SIZE; | |
724 | ||
3947be19 DH |
725 | /* |
726 | * Create entries for memory sections that were found | |
727 | * during boot and have been initialized | |
728 | */ | |
b1eaef3d | 729 | mutex_lock(&mem_sysfs_mutex); |
cb5e39b8 SJ |
730 | for (i = 0; i < NR_MEM_SECTIONS; i += sections_per_block) { |
731 | err = add_memory_block(i); | |
28ec24e2 AM |
732 | if (!ret) |
733 | ret = err; | |
3947be19 | 734 | } |
b1eaef3d | 735 | mutex_unlock(&mem_sysfs_mutex); |
3947be19 | 736 | |
28ec24e2 AM |
737 | out: |
738 | if (ret) | |
2b3a302a | 739 | printk(KERN_ERR "%s() failed: %d\n", __func__, ret); |
3947be19 DH |
740 | return ret; |
741 | } |