Commit | Line | Data |
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1f7df6f8 DW |
1 | /* |
2 | * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | */ | |
eaf96153 | 13 | #include <linux/scatterlist.h> |
047fc8a1 | 14 | #include <linux/highmem.h> |
eaf96153 | 15 | #include <linux/sched.h> |
1f7df6f8 | 16 | #include <linux/slab.h> |
eaf96153 | 17 | #include <linux/sort.h> |
1f7df6f8 | 18 | #include <linux/io.h> |
bf9bccc1 | 19 | #include <linux/nd.h> |
1f7df6f8 DW |
20 | #include "nd-core.h" |
21 | #include "nd.h" | |
22 | ||
23 | static DEFINE_IDA(region_ida); | |
24 | ||
25 | static void nd_region_release(struct device *dev) | |
26 | { | |
27 | struct nd_region *nd_region = to_nd_region(dev); | |
28 | u16 i; | |
29 | ||
30 | for (i = 0; i < nd_region->ndr_mappings; i++) { | |
31 | struct nd_mapping *nd_mapping = &nd_region->mapping[i]; | |
32 | struct nvdimm *nvdimm = nd_mapping->nvdimm; | |
33 | ||
34 | put_device(&nvdimm->dev); | |
35 | } | |
5212e11f | 36 | free_percpu(nd_region->lane); |
1f7df6f8 | 37 | ida_simple_remove(®ion_ida, nd_region->id); |
047fc8a1 RZ |
38 | if (is_nd_blk(dev)) |
39 | kfree(to_nd_blk_region(dev)); | |
40 | else | |
41 | kfree(nd_region); | |
1f7df6f8 DW |
42 | } |
43 | ||
44 | static struct device_type nd_blk_device_type = { | |
45 | .name = "nd_blk", | |
46 | .release = nd_region_release, | |
47 | }; | |
48 | ||
49 | static struct device_type nd_pmem_device_type = { | |
50 | .name = "nd_pmem", | |
51 | .release = nd_region_release, | |
52 | }; | |
53 | ||
54 | static struct device_type nd_volatile_device_type = { | |
55 | .name = "nd_volatile", | |
56 | .release = nd_region_release, | |
57 | }; | |
58 | ||
3d88002e | 59 | bool is_nd_pmem(struct device *dev) |
1f7df6f8 DW |
60 | { |
61 | return dev ? dev->type == &nd_pmem_device_type : false; | |
62 | } | |
63 | ||
3d88002e DW |
64 | bool is_nd_blk(struct device *dev) |
65 | { | |
66 | return dev ? dev->type == &nd_blk_device_type : false; | |
67 | } | |
68 | ||
1f7df6f8 DW |
69 | struct nd_region *to_nd_region(struct device *dev) |
70 | { | |
71 | struct nd_region *nd_region = container_of(dev, struct nd_region, dev); | |
72 | ||
73 | WARN_ON(dev->type->release != nd_region_release); | |
74 | return nd_region; | |
75 | } | |
76 | EXPORT_SYMBOL_GPL(to_nd_region); | |
77 | ||
047fc8a1 RZ |
78 | struct nd_blk_region *to_nd_blk_region(struct device *dev) |
79 | { | |
80 | struct nd_region *nd_region = to_nd_region(dev); | |
81 | ||
82 | WARN_ON(!is_nd_blk(dev)); | |
83 | return container_of(nd_region, struct nd_blk_region, nd_region); | |
84 | } | |
85 | EXPORT_SYMBOL_GPL(to_nd_blk_region); | |
86 | ||
87 | void *nd_region_provider_data(struct nd_region *nd_region) | |
88 | { | |
89 | return nd_region->provider_data; | |
90 | } | |
91 | EXPORT_SYMBOL_GPL(nd_region_provider_data); | |
92 | ||
93 | void *nd_blk_region_provider_data(struct nd_blk_region *ndbr) | |
94 | { | |
95 | return ndbr->blk_provider_data; | |
96 | } | |
97 | EXPORT_SYMBOL_GPL(nd_blk_region_provider_data); | |
98 | ||
99 | void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data) | |
100 | { | |
101 | ndbr->blk_provider_data = data; | |
102 | } | |
103 | EXPORT_SYMBOL_GPL(nd_blk_region_set_provider_data); | |
104 | ||
3d88002e DW |
105 | /** |
106 | * nd_region_to_nstype() - region to an integer namespace type | |
107 | * @nd_region: region-device to interrogate | |
108 | * | |
109 | * This is the 'nstype' attribute of a region as well, an input to the | |
110 | * MODALIAS for namespace devices, and bit number for a nvdimm_bus to match | |
111 | * namespace devices with namespace drivers. | |
112 | */ | |
113 | int nd_region_to_nstype(struct nd_region *nd_region) | |
114 | { | |
115 | if (is_nd_pmem(&nd_region->dev)) { | |
116 | u16 i, alias; | |
117 | ||
118 | for (i = 0, alias = 0; i < nd_region->ndr_mappings; i++) { | |
119 | struct nd_mapping *nd_mapping = &nd_region->mapping[i]; | |
120 | struct nvdimm *nvdimm = nd_mapping->nvdimm; | |
121 | ||
122 | if (nvdimm->flags & NDD_ALIASING) | |
123 | alias++; | |
124 | } | |
125 | if (alias) | |
126 | return ND_DEVICE_NAMESPACE_PMEM; | |
127 | else | |
128 | return ND_DEVICE_NAMESPACE_IO; | |
129 | } else if (is_nd_blk(&nd_region->dev)) { | |
130 | return ND_DEVICE_NAMESPACE_BLK; | |
131 | } | |
132 | ||
133 | return 0; | |
134 | } | |
bf9bccc1 DW |
135 | EXPORT_SYMBOL(nd_region_to_nstype); |
136 | ||
137 | static int is_uuid_busy(struct device *dev, void *data) | |
138 | { | |
139 | struct nd_region *nd_region = to_nd_region(dev->parent); | |
140 | u8 *uuid = data; | |
141 | ||
142 | switch (nd_region_to_nstype(nd_region)) { | |
143 | case ND_DEVICE_NAMESPACE_PMEM: { | |
144 | struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev); | |
145 | ||
146 | if (!nspm->uuid) | |
147 | break; | |
148 | if (memcmp(uuid, nspm->uuid, NSLABEL_UUID_LEN) == 0) | |
149 | return -EBUSY; | |
150 | break; | |
151 | } | |
152 | case ND_DEVICE_NAMESPACE_BLK: { | |
1b40e09a DW |
153 | struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev); |
154 | ||
155 | if (!nsblk->uuid) | |
156 | break; | |
157 | if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) == 0) | |
158 | return -EBUSY; | |
bf9bccc1 DW |
159 | break; |
160 | } | |
161 | default: | |
162 | break; | |
163 | } | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
168 | static int is_namespace_uuid_busy(struct device *dev, void *data) | |
169 | { | |
170 | if (is_nd_pmem(dev) || is_nd_blk(dev)) | |
171 | return device_for_each_child(dev, data, is_uuid_busy); | |
172 | return 0; | |
173 | } | |
174 | ||
175 | /** | |
176 | * nd_is_uuid_unique - verify that no other namespace has @uuid | |
177 | * @dev: any device on a nvdimm_bus | |
178 | * @uuid: uuid to check | |
179 | */ | |
180 | bool nd_is_uuid_unique(struct device *dev, u8 *uuid) | |
181 | { | |
182 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
183 | ||
184 | if (!nvdimm_bus) | |
185 | return false; | |
186 | WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm_bus->dev)); | |
187 | if (device_for_each_child(&nvdimm_bus->dev, uuid, | |
188 | is_namespace_uuid_busy) != 0) | |
189 | return false; | |
190 | return true; | |
191 | } | |
3d88002e | 192 | |
1f7df6f8 DW |
193 | static ssize_t size_show(struct device *dev, |
194 | struct device_attribute *attr, char *buf) | |
195 | { | |
196 | struct nd_region *nd_region = to_nd_region(dev); | |
197 | unsigned long long size = 0; | |
198 | ||
199 | if (is_nd_pmem(dev)) { | |
200 | size = nd_region->ndr_size; | |
201 | } else if (nd_region->ndr_mappings == 1) { | |
202 | struct nd_mapping *nd_mapping = &nd_region->mapping[0]; | |
203 | ||
204 | size = nd_mapping->size; | |
205 | } | |
206 | ||
207 | return sprintf(buf, "%llu\n", size); | |
208 | } | |
209 | static DEVICE_ATTR_RO(size); | |
210 | ||
211 | static ssize_t mappings_show(struct device *dev, | |
212 | struct device_attribute *attr, char *buf) | |
213 | { | |
214 | struct nd_region *nd_region = to_nd_region(dev); | |
215 | ||
216 | return sprintf(buf, "%d\n", nd_region->ndr_mappings); | |
217 | } | |
218 | static DEVICE_ATTR_RO(mappings); | |
219 | ||
3d88002e DW |
220 | static ssize_t nstype_show(struct device *dev, |
221 | struct device_attribute *attr, char *buf) | |
222 | { | |
223 | struct nd_region *nd_region = to_nd_region(dev); | |
224 | ||
225 | return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region)); | |
226 | } | |
227 | static DEVICE_ATTR_RO(nstype); | |
228 | ||
eaf96153 DW |
229 | static ssize_t set_cookie_show(struct device *dev, |
230 | struct device_attribute *attr, char *buf) | |
231 | { | |
232 | struct nd_region *nd_region = to_nd_region(dev); | |
233 | struct nd_interleave_set *nd_set = nd_region->nd_set; | |
234 | ||
235 | if (is_nd_pmem(dev) && nd_set) | |
236 | /* pass, should be precluded by region_visible */; | |
237 | else | |
238 | return -ENXIO; | |
239 | ||
240 | return sprintf(buf, "%#llx\n", nd_set->cookie); | |
241 | } | |
242 | static DEVICE_ATTR_RO(set_cookie); | |
243 | ||
bf9bccc1 DW |
244 | resource_size_t nd_region_available_dpa(struct nd_region *nd_region) |
245 | { | |
246 | resource_size_t blk_max_overlap = 0, available, overlap; | |
247 | int i; | |
248 | ||
249 | WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev)); | |
250 | ||
251 | retry: | |
252 | available = 0; | |
253 | overlap = blk_max_overlap; | |
254 | for (i = 0; i < nd_region->ndr_mappings; i++) { | |
255 | struct nd_mapping *nd_mapping = &nd_region->mapping[i]; | |
256 | struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); | |
257 | ||
258 | /* if a dimm is disabled the available capacity is zero */ | |
259 | if (!ndd) | |
260 | return 0; | |
261 | ||
262 | if (is_nd_pmem(&nd_region->dev)) { | |
263 | available += nd_pmem_available_dpa(nd_region, | |
264 | nd_mapping, &overlap); | |
265 | if (overlap > blk_max_overlap) { | |
266 | blk_max_overlap = overlap; | |
267 | goto retry; | |
268 | } | |
269 | } else if (is_nd_blk(&nd_region->dev)) { | |
1b40e09a | 270 | available += nd_blk_available_dpa(nd_mapping); |
bf9bccc1 DW |
271 | } |
272 | } | |
273 | ||
274 | return available; | |
275 | } | |
276 | ||
277 | static ssize_t available_size_show(struct device *dev, | |
278 | struct device_attribute *attr, char *buf) | |
279 | { | |
280 | struct nd_region *nd_region = to_nd_region(dev); | |
281 | unsigned long long available = 0; | |
282 | ||
283 | /* | |
284 | * Flush in-flight updates and grab a snapshot of the available | |
285 | * size. Of course, this value is potentially invalidated the | |
286 | * memory nvdimm_bus_lock() is dropped, but that's userspace's | |
287 | * problem to not race itself. | |
288 | */ | |
289 | nvdimm_bus_lock(dev); | |
290 | wait_nvdimm_bus_probe_idle(dev); | |
291 | available = nd_region_available_dpa(nd_region); | |
292 | nvdimm_bus_unlock(dev); | |
293 | ||
294 | return sprintf(buf, "%llu\n", available); | |
295 | } | |
296 | static DEVICE_ATTR_RO(available_size); | |
297 | ||
3d88002e DW |
298 | static ssize_t init_namespaces_show(struct device *dev, |
299 | struct device_attribute *attr, char *buf) | |
300 | { | |
301 | struct nd_region_namespaces *num_ns = dev_get_drvdata(dev); | |
302 | ssize_t rc; | |
303 | ||
304 | nvdimm_bus_lock(dev); | |
305 | if (num_ns) | |
306 | rc = sprintf(buf, "%d/%d\n", num_ns->active, num_ns->count); | |
307 | else | |
308 | rc = -ENXIO; | |
309 | nvdimm_bus_unlock(dev); | |
310 | ||
311 | return rc; | |
312 | } | |
313 | static DEVICE_ATTR_RO(init_namespaces); | |
314 | ||
bf9bccc1 DW |
315 | static ssize_t namespace_seed_show(struct device *dev, |
316 | struct device_attribute *attr, char *buf) | |
317 | { | |
318 | struct nd_region *nd_region = to_nd_region(dev); | |
319 | ssize_t rc; | |
320 | ||
321 | nvdimm_bus_lock(dev); | |
322 | if (nd_region->ns_seed) | |
323 | rc = sprintf(buf, "%s\n", dev_name(nd_region->ns_seed)); | |
324 | else | |
325 | rc = sprintf(buf, "\n"); | |
326 | nvdimm_bus_unlock(dev); | |
327 | return rc; | |
328 | } | |
329 | static DEVICE_ATTR_RO(namespace_seed); | |
330 | ||
8c2f7e86 DW |
331 | static ssize_t btt_seed_show(struct device *dev, |
332 | struct device_attribute *attr, char *buf) | |
333 | { | |
334 | struct nd_region *nd_region = to_nd_region(dev); | |
335 | ssize_t rc; | |
336 | ||
337 | nvdimm_bus_lock(dev); | |
338 | if (nd_region->btt_seed) | |
339 | rc = sprintf(buf, "%s\n", dev_name(nd_region->btt_seed)); | |
340 | else | |
341 | rc = sprintf(buf, "\n"); | |
342 | nvdimm_bus_unlock(dev); | |
343 | ||
344 | return rc; | |
345 | } | |
346 | static DEVICE_ATTR_RO(btt_seed); | |
347 | ||
e1455744 DW |
348 | static ssize_t pfn_seed_show(struct device *dev, |
349 | struct device_attribute *attr, char *buf) | |
350 | { | |
351 | struct nd_region *nd_region = to_nd_region(dev); | |
352 | ssize_t rc; | |
353 | ||
354 | nvdimm_bus_lock(dev); | |
355 | if (nd_region->pfn_seed) | |
356 | rc = sprintf(buf, "%s\n", dev_name(nd_region->pfn_seed)); | |
357 | else | |
358 | rc = sprintf(buf, "\n"); | |
359 | nvdimm_bus_unlock(dev); | |
360 | ||
361 | return rc; | |
362 | } | |
363 | static DEVICE_ATTR_RO(pfn_seed); | |
364 | ||
58138820 DW |
365 | static ssize_t read_only_show(struct device *dev, |
366 | struct device_attribute *attr, char *buf) | |
367 | { | |
368 | struct nd_region *nd_region = to_nd_region(dev); | |
369 | ||
370 | return sprintf(buf, "%d\n", nd_region->ro); | |
371 | } | |
372 | ||
373 | static ssize_t read_only_store(struct device *dev, | |
374 | struct device_attribute *attr, const char *buf, size_t len) | |
375 | { | |
376 | bool ro; | |
377 | int rc = strtobool(buf, &ro); | |
378 | struct nd_region *nd_region = to_nd_region(dev); | |
379 | ||
380 | if (rc) | |
381 | return rc; | |
382 | ||
383 | nd_region->ro = ro; | |
384 | return len; | |
385 | } | |
386 | static DEVICE_ATTR_RW(read_only); | |
387 | ||
1f7df6f8 DW |
388 | static struct attribute *nd_region_attributes[] = { |
389 | &dev_attr_size.attr, | |
3d88002e | 390 | &dev_attr_nstype.attr, |
1f7df6f8 | 391 | &dev_attr_mappings.attr, |
8c2f7e86 | 392 | &dev_attr_btt_seed.attr, |
e1455744 | 393 | &dev_attr_pfn_seed.attr, |
58138820 | 394 | &dev_attr_read_only.attr, |
eaf96153 | 395 | &dev_attr_set_cookie.attr, |
bf9bccc1 DW |
396 | &dev_attr_available_size.attr, |
397 | &dev_attr_namespace_seed.attr, | |
3d88002e | 398 | &dev_attr_init_namespaces.attr, |
1f7df6f8 DW |
399 | NULL, |
400 | }; | |
401 | ||
eaf96153 DW |
402 | static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n) |
403 | { | |
404 | struct device *dev = container_of(kobj, typeof(*dev), kobj); | |
405 | struct nd_region *nd_region = to_nd_region(dev); | |
406 | struct nd_interleave_set *nd_set = nd_region->nd_set; | |
bf9bccc1 | 407 | int type = nd_region_to_nstype(nd_region); |
eaf96153 | 408 | |
6bb691ac DK |
409 | if (!is_nd_pmem(dev) && a == &dev_attr_pfn_seed.attr) |
410 | return 0; | |
411 | ||
bf9bccc1 DW |
412 | if (a != &dev_attr_set_cookie.attr |
413 | && a != &dev_attr_available_size.attr) | |
eaf96153 DW |
414 | return a->mode; |
415 | ||
bf9bccc1 DW |
416 | if ((type == ND_DEVICE_NAMESPACE_PMEM |
417 | || type == ND_DEVICE_NAMESPACE_BLK) | |
418 | && a == &dev_attr_available_size.attr) | |
419 | return a->mode; | |
420 | else if (is_nd_pmem(dev) && nd_set) | |
421 | return a->mode; | |
eaf96153 DW |
422 | |
423 | return 0; | |
424 | } | |
425 | ||
1f7df6f8 DW |
426 | struct attribute_group nd_region_attribute_group = { |
427 | .attrs = nd_region_attributes, | |
eaf96153 | 428 | .is_visible = region_visible, |
1f7df6f8 DW |
429 | }; |
430 | EXPORT_SYMBOL_GPL(nd_region_attribute_group); | |
431 | ||
bf9bccc1 DW |
432 | u64 nd_region_interleave_set_cookie(struct nd_region *nd_region) |
433 | { | |
434 | struct nd_interleave_set *nd_set = nd_region->nd_set; | |
435 | ||
436 | if (nd_set) | |
437 | return nd_set->cookie; | |
438 | return 0; | |
439 | } | |
440 | ||
eaf96153 DW |
441 | /* |
442 | * Upon successful probe/remove, take/release a reference on the | |
8c2f7e86 | 443 | * associated interleave set (if present), and plant new btt + namespace |
047fc8a1 RZ |
444 | * seeds. Also, on the removal of a BLK region, notify the provider to |
445 | * disable the region. | |
eaf96153 DW |
446 | */ |
447 | static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus, | |
448 | struct device *dev, bool probe) | |
449 | { | |
8c2f7e86 DW |
450 | struct nd_region *nd_region; |
451 | ||
bf9bccc1 | 452 | if (!probe && (is_nd_pmem(dev) || is_nd_blk(dev))) { |
eaf96153 DW |
453 | int i; |
454 | ||
8c2f7e86 | 455 | nd_region = to_nd_region(dev); |
eaf96153 DW |
456 | for (i = 0; i < nd_region->ndr_mappings; i++) { |
457 | struct nd_mapping *nd_mapping = &nd_region->mapping[i]; | |
bf9bccc1 | 458 | struct nvdimm_drvdata *ndd = nd_mapping->ndd; |
eaf96153 DW |
459 | struct nvdimm *nvdimm = nd_mapping->nvdimm; |
460 | ||
bf9bccc1 DW |
461 | kfree(nd_mapping->labels); |
462 | nd_mapping->labels = NULL; | |
463 | put_ndd(ndd); | |
464 | nd_mapping->ndd = NULL; | |
047fc8a1 RZ |
465 | if (ndd) |
466 | atomic_dec(&nvdimm->busy); | |
eaf96153 | 467 | } |
047fc8a1 RZ |
468 | |
469 | if (is_nd_pmem(dev)) | |
470 | return; | |
471 | ||
472 | to_nd_blk_region(dev)->disable(nvdimm_bus, dev); | |
8c2f7e86 DW |
473 | } |
474 | if (dev->parent && is_nd_blk(dev->parent) && probe) { | |
475 | nd_region = to_nd_region(dev->parent); | |
1b40e09a DW |
476 | nvdimm_bus_lock(dev); |
477 | if (nd_region->ns_seed == dev) | |
478 | nd_region_create_blk_seed(nd_region); | |
479 | nvdimm_bus_unlock(dev); | |
eaf96153 | 480 | } |
8c2f7e86 | 481 | if (is_nd_btt(dev) && probe) { |
8ca24353 DW |
482 | struct nd_btt *nd_btt = to_nd_btt(dev); |
483 | ||
8c2f7e86 DW |
484 | nd_region = to_nd_region(dev->parent); |
485 | nvdimm_bus_lock(dev); | |
486 | if (nd_region->btt_seed == dev) | |
487 | nd_region_create_btt_seed(nd_region); | |
8ca24353 DW |
488 | if (nd_region->ns_seed == &nd_btt->ndns->dev && |
489 | is_nd_blk(dev->parent)) | |
490 | nd_region_create_blk_seed(nd_region); | |
8c2f7e86 DW |
491 | nvdimm_bus_unlock(dev); |
492 | } | |
eaf96153 DW |
493 | } |
494 | ||
495 | void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev) | |
496 | { | |
497 | nd_region_notify_driver_action(nvdimm_bus, dev, true); | |
498 | } | |
499 | ||
500 | void nd_region_disable(struct nvdimm_bus *nvdimm_bus, struct device *dev) | |
501 | { | |
502 | nd_region_notify_driver_action(nvdimm_bus, dev, false); | |
503 | } | |
504 | ||
1f7df6f8 DW |
505 | static ssize_t mappingN(struct device *dev, char *buf, int n) |
506 | { | |
507 | struct nd_region *nd_region = to_nd_region(dev); | |
508 | struct nd_mapping *nd_mapping; | |
509 | struct nvdimm *nvdimm; | |
510 | ||
511 | if (n >= nd_region->ndr_mappings) | |
512 | return -ENXIO; | |
513 | nd_mapping = &nd_region->mapping[n]; | |
514 | nvdimm = nd_mapping->nvdimm; | |
515 | ||
516 | return sprintf(buf, "%s,%llu,%llu\n", dev_name(&nvdimm->dev), | |
517 | nd_mapping->start, nd_mapping->size); | |
518 | } | |
519 | ||
520 | #define REGION_MAPPING(idx) \ | |
521 | static ssize_t mapping##idx##_show(struct device *dev, \ | |
522 | struct device_attribute *attr, char *buf) \ | |
523 | { \ | |
524 | return mappingN(dev, buf, idx); \ | |
525 | } \ | |
526 | static DEVICE_ATTR_RO(mapping##idx) | |
527 | ||
528 | /* | |
529 | * 32 should be enough for a while, even in the presence of socket | |
530 | * interleave a 32-way interleave set is a degenerate case. | |
531 | */ | |
532 | REGION_MAPPING(0); | |
533 | REGION_MAPPING(1); | |
534 | REGION_MAPPING(2); | |
535 | REGION_MAPPING(3); | |
536 | REGION_MAPPING(4); | |
537 | REGION_MAPPING(5); | |
538 | REGION_MAPPING(6); | |
539 | REGION_MAPPING(7); | |
540 | REGION_MAPPING(8); | |
541 | REGION_MAPPING(9); | |
542 | REGION_MAPPING(10); | |
543 | REGION_MAPPING(11); | |
544 | REGION_MAPPING(12); | |
545 | REGION_MAPPING(13); | |
546 | REGION_MAPPING(14); | |
547 | REGION_MAPPING(15); | |
548 | REGION_MAPPING(16); | |
549 | REGION_MAPPING(17); | |
550 | REGION_MAPPING(18); | |
551 | REGION_MAPPING(19); | |
552 | REGION_MAPPING(20); | |
553 | REGION_MAPPING(21); | |
554 | REGION_MAPPING(22); | |
555 | REGION_MAPPING(23); | |
556 | REGION_MAPPING(24); | |
557 | REGION_MAPPING(25); | |
558 | REGION_MAPPING(26); | |
559 | REGION_MAPPING(27); | |
560 | REGION_MAPPING(28); | |
561 | REGION_MAPPING(29); | |
562 | REGION_MAPPING(30); | |
563 | REGION_MAPPING(31); | |
564 | ||
565 | static umode_t mapping_visible(struct kobject *kobj, struct attribute *a, int n) | |
566 | { | |
567 | struct device *dev = container_of(kobj, struct device, kobj); | |
568 | struct nd_region *nd_region = to_nd_region(dev); | |
569 | ||
570 | if (n < nd_region->ndr_mappings) | |
571 | return a->mode; | |
572 | return 0; | |
573 | } | |
574 | ||
575 | static struct attribute *mapping_attributes[] = { | |
576 | &dev_attr_mapping0.attr, | |
577 | &dev_attr_mapping1.attr, | |
578 | &dev_attr_mapping2.attr, | |
579 | &dev_attr_mapping3.attr, | |
580 | &dev_attr_mapping4.attr, | |
581 | &dev_attr_mapping5.attr, | |
582 | &dev_attr_mapping6.attr, | |
583 | &dev_attr_mapping7.attr, | |
584 | &dev_attr_mapping8.attr, | |
585 | &dev_attr_mapping9.attr, | |
586 | &dev_attr_mapping10.attr, | |
587 | &dev_attr_mapping11.attr, | |
588 | &dev_attr_mapping12.attr, | |
589 | &dev_attr_mapping13.attr, | |
590 | &dev_attr_mapping14.attr, | |
591 | &dev_attr_mapping15.attr, | |
592 | &dev_attr_mapping16.attr, | |
593 | &dev_attr_mapping17.attr, | |
594 | &dev_attr_mapping18.attr, | |
595 | &dev_attr_mapping19.attr, | |
596 | &dev_attr_mapping20.attr, | |
597 | &dev_attr_mapping21.attr, | |
598 | &dev_attr_mapping22.attr, | |
599 | &dev_attr_mapping23.attr, | |
600 | &dev_attr_mapping24.attr, | |
601 | &dev_attr_mapping25.attr, | |
602 | &dev_attr_mapping26.attr, | |
603 | &dev_attr_mapping27.attr, | |
604 | &dev_attr_mapping28.attr, | |
605 | &dev_attr_mapping29.attr, | |
606 | &dev_attr_mapping30.attr, | |
607 | &dev_attr_mapping31.attr, | |
608 | NULL, | |
609 | }; | |
610 | ||
611 | struct attribute_group nd_mapping_attribute_group = { | |
612 | .is_visible = mapping_visible, | |
613 | .attrs = mapping_attributes, | |
614 | }; | |
615 | EXPORT_SYMBOL_GPL(nd_mapping_attribute_group); | |
616 | ||
047fc8a1 | 617 | int nd_blk_region_init(struct nd_region *nd_region) |
1f7df6f8 | 618 | { |
047fc8a1 RZ |
619 | struct device *dev = &nd_region->dev; |
620 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
621 | ||
622 | if (!is_nd_blk(dev)) | |
623 | return 0; | |
624 | ||
625 | if (nd_region->ndr_mappings < 1) { | |
626 | dev_err(dev, "invalid BLK region\n"); | |
627 | return -ENXIO; | |
628 | } | |
629 | ||
630 | return to_nd_blk_region(dev)->enable(nvdimm_bus, dev); | |
1f7df6f8 | 631 | } |
1f7df6f8 | 632 | |
5212e11f VV |
633 | /** |
634 | * nd_region_acquire_lane - allocate and lock a lane | |
635 | * @nd_region: region id and number of lanes possible | |
636 | * | |
637 | * A lane correlates to a BLK-data-window and/or a log slot in the BTT. | |
638 | * We optimize for the common case where there are 256 lanes, one | |
639 | * per-cpu. For larger systems we need to lock to share lanes. For now | |
640 | * this implementation assumes the cost of maintaining an allocator for | |
641 | * free lanes is on the order of the lock hold time, so it implements a | |
642 | * static lane = cpu % num_lanes mapping. | |
643 | * | |
644 | * In the case of a BTT instance on top of a BLK namespace a lane may be | |
645 | * acquired recursively. We lock on the first instance. | |
646 | * | |
647 | * In the case of a BTT instance on top of PMEM, we only acquire a lane | |
648 | * for the BTT metadata updates. | |
649 | */ | |
650 | unsigned int nd_region_acquire_lane(struct nd_region *nd_region) | |
651 | { | |
652 | unsigned int cpu, lane; | |
653 | ||
654 | cpu = get_cpu(); | |
655 | if (nd_region->num_lanes < nr_cpu_ids) { | |
656 | struct nd_percpu_lane *ndl_lock, *ndl_count; | |
657 | ||
658 | lane = cpu % nd_region->num_lanes; | |
659 | ndl_count = per_cpu_ptr(nd_region->lane, cpu); | |
660 | ndl_lock = per_cpu_ptr(nd_region->lane, lane); | |
661 | if (ndl_count->count++ == 0) | |
662 | spin_lock(&ndl_lock->lock); | |
663 | } else | |
664 | lane = cpu; | |
665 | ||
666 | return lane; | |
667 | } | |
668 | EXPORT_SYMBOL(nd_region_acquire_lane); | |
669 | ||
670 | void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane) | |
671 | { | |
672 | if (nd_region->num_lanes < nr_cpu_ids) { | |
673 | unsigned int cpu = get_cpu(); | |
674 | struct nd_percpu_lane *ndl_lock, *ndl_count; | |
675 | ||
676 | ndl_count = per_cpu_ptr(nd_region->lane, cpu); | |
677 | ndl_lock = per_cpu_ptr(nd_region->lane, lane); | |
678 | if (--ndl_count->count == 0) | |
679 | spin_unlock(&ndl_lock->lock); | |
680 | put_cpu(); | |
681 | } | |
682 | put_cpu(); | |
683 | } | |
684 | EXPORT_SYMBOL(nd_region_release_lane); | |
685 | ||
1f7df6f8 DW |
686 | static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus, |
687 | struct nd_region_desc *ndr_desc, struct device_type *dev_type, | |
688 | const char *caller) | |
689 | { | |
690 | struct nd_region *nd_region; | |
691 | struct device *dev; | |
047fc8a1 | 692 | void *region_buf; |
5212e11f | 693 | unsigned int i; |
58138820 | 694 | int ro = 0; |
1f7df6f8 DW |
695 | |
696 | for (i = 0; i < ndr_desc->num_mappings; i++) { | |
697 | struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i]; | |
698 | struct nvdimm *nvdimm = nd_mapping->nvdimm; | |
699 | ||
700 | if ((nd_mapping->start | nd_mapping->size) % SZ_4K) { | |
701 | dev_err(&nvdimm_bus->dev, "%s: %s mapping%d is not 4K aligned\n", | |
702 | caller, dev_name(&nvdimm->dev), i); | |
703 | ||
704 | return NULL; | |
705 | } | |
58138820 DW |
706 | |
707 | if (nvdimm->flags & NDD_UNARMED) | |
708 | ro = 1; | |
1f7df6f8 DW |
709 | } |
710 | ||
047fc8a1 RZ |
711 | if (dev_type == &nd_blk_device_type) { |
712 | struct nd_blk_region_desc *ndbr_desc; | |
713 | struct nd_blk_region *ndbr; | |
714 | ||
715 | ndbr_desc = to_blk_region_desc(ndr_desc); | |
716 | ndbr = kzalloc(sizeof(*ndbr) + sizeof(struct nd_mapping) | |
717 | * ndr_desc->num_mappings, | |
718 | GFP_KERNEL); | |
719 | if (ndbr) { | |
720 | nd_region = &ndbr->nd_region; | |
721 | ndbr->enable = ndbr_desc->enable; | |
722 | ndbr->disable = ndbr_desc->disable; | |
723 | ndbr->do_io = ndbr_desc->do_io; | |
724 | } | |
725 | region_buf = ndbr; | |
726 | } else { | |
727 | nd_region = kzalloc(sizeof(struct nd_region) | |
728 | + sizeof(struct nd_mapping) | |
729 | * ndr_desc->num_mappings, | |
730 | GFP_KERNEL); | |
731 | region_buf = nd_region; | |
732 | } | |
733 | ||
734 | if (!region_buf) | |
1f7df6f8 DW |
735 | return NULL; |
736 | nd_region->id = ida_simple_get(®ion_ida, 0, 0, GFP_KERNEL); | |
5212e11f VV |
737 | if (nd_region->id < 0) |
738 | goto err_id; | |
739 | ||
740 | nd_region->lane = alloc_percpu(struct nd_percpu_lane); | |
741 | if (!nd_region->lane) | |
742 | goto err_percpu; | |
743 | ||
744 | for (i = 0; i < nr_cpu_ids; i++) { | |
745 | struct nd_percpu_lane *ndl; | |
746 | ||
747 | ndl = per_cpu_ptr(nd_region->lane, i); | |
748 | spin_lock_init(&ndl->lock); | |
749 | ndl->count = 0; | |
1f7df6f8 DW |
750 | } |
751 | ||
752 | memcpy(nd_region->mapping, ndr_desc->nd_mapping, | |
753 | sizeof(struct nd_mapping) * ndr_desc->num_mappings); | |
754 | for (i = 0; i < ndr_desc->num_mappings; i++) { | |
755 | struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i]; | |
756 | struct nvdimm *nvdimm = nd_mapping->nvdimm; | |
757 | ||
758 | get_device(&nvdimm->dev); | |
759 | } | |
760 | nd_region->ndr_mappings = ndr_desc->num_mappings; | |
761 | nd_region->provider_data = ndr_desc->provider_data; | |
eaf96153 | 762 | nd_region->nd_set = ndr_desc->nd_set; |
5212e11f | 763 | nd_region->num_lanes = ndr_desc->num_lanes; |
004f1afb | 764 | nd_region->flags = ndr_desc->flags; |
58138820 | 765 | nd_region->ro = ro; |
41d7a6d6 | 766 | nd_region->numa_node = ndr_desc->numa_node; |
1b40e09a | 767 | ida_init(&nd_region->ns_ida); |
8c2f7e86 | 768 | ida_init(&nd_region->btt_ida); |
e1455744 | 769 | ida_init(&nd_region->pfn_ida); |
1f7df6f8 DW |
770 | dev = &nd_region->dev; |
771 | dev_set_name(dev, "region%d", nd_region->id); | |
772 | dev->parent = &nvdimm_bus->dev; | |
773 | dev->type = dev_type; | |
774 | dev->groups = ndr_desc->attr_groups; | |
775 | nd_region->ndr_size = resource_size(ndr_desc->res); | |
776 | nd_region->ndr_start = ndr_desc->res->start; | |
777 | nd_device_register(dev); | |
778 | ||
779 | return nd_region; | |
5212e11f VV |
780 | |
781 | err_percpu: | |
782 | ida_simple_remove(®ion_ida, nd_region->id); | |
783 | err_id: | |
047fc8a1 | 784 | kfree(region_buf); |
5212e11f | 785 | return NULL; |
1f7df6f8 DW |
786 | } |
787 | ||
788 | struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus, | |
789 | struct nd_region_desc *ndr_desc) | |
790 | { | |
5212e11f | 791 | ndr_desc->num_lanes = ND_MAX_LANES; |
1f7df6f8 DW |
792 | return nd_region_create(nvdimm_bus, ndr_desc, &nd_pmem_device_type, |
793 | __func__); | |
794 | } | |
795 | EXPORT_SYMBOL_GPL(nvdimm_pmem_region_create); | |
796 | ||
797 | struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus, | |
798 | struct nd_region_desc *ndr_desc) | |
799 | { | |
800 | if (ndr_desc->num_mappings > 1) | |
801 | return NULL; | |
5212e11f | 802 | ndr_desc->num_lanes = min(ndr_desc->num_lanes, ND_MAX_LANES); |
1f7df6f8 DW |
803 | return nd_region_create(nvdimm_bus, ndr_desc, &nd_blk_device_type, |
804 | __func__); | |
805 | } | |
806 | EXPORT_SYMBOL_GPL(nvdimm_blk_region_create); | |
807 | ||
808 | struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus, | |
809 | struct nd_region_desc *ndr_desc) | |
810 | { | |
5212e11f | 811 | ndr_desc->num_lanes = ND_MAX_LANES; |
1f7df6f8 DW |
812 | return nd_region_create(nvdimm_bus, ndr_desc, &nd_volatile_device_type, |
813 | __func__); | |
814 | } | |
815 | EXPORT_SYMBOL_GPL(nvdimm_volatile_region_create); |