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 | ||
1f7df6f8 DW |
137 | static ssize_t size_show(struct device *dev, |
138 | struct device_attribute *attr, char *buf) | |
139 | { | |
140 | struct nd_region *nd_region = to_nd_region(dev); | |
141 | unsigned long long size = 0; | |
142 | ||
143 | if (is_nd_pmem(dev)) { | |
144 | size = nd_region->ndr_size; | |
145 | } else if (nd_region->ndr_mappings == 1) { | |
146 | struct nd_mapping *nd_mapping = &nd_region->mapping[0]; | |
147 | ||
148 | size = nd_mapping->size; | |
149 | } | |
150 | ||
151 | return sprintf(buf, "%llu\n", size); | |
152 | } | |
153 | static DEVICE_ATTR_RO(size); | |
154 | ||
155 | static ssize_t mappings_show(struct device *dev, | |
156 | struct device_attribute *attr, char *buf) | |
157 | { | |
158 | struct nd_region *nd_region = to_nd_region(dev); | |
159 | ||
160 | return sprintf(buf, "%d\n", nd_region->ndr_mappings); | |
161 | } | |
162 | static DEVICE_ATTR_RO(mappings); | |
163 | ||
3d88002e DW |
164 | static ssize_t nstype_show(struct device *dev, |
165 | struct device_attribute *attr, char *buf) | |
166 | { | |
167 | struct nd_region *nd_region = to_nd_region(dev); | |
168 | ||
169 | return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region)); | |
170 | } | |
171 | static DEVICE_ATTR_RO(nstype); | |
172 | ||
eaf96153 DW |
173 | static ssize_t set_cookie_show(struct device *dev, |
174 | struct device_attribute *attr, char *buf) | |
175 | { | |
176 | struct nd_region *nd_region = to_nd_region(dev); | |
177 | struct nd_interleave_set *nd_set = nd_region->nd_set; | |
178 | ||
179 | if (is_nd_pmem(dev) && nd_set) | |
180 | /* pass, should be precluded by region_visible */; | |
181 | else | |
182 | return -ENXIO; | |
183 | ||
184 | return sprintf(buf, "%#llx\n", nd_set->cookie); | |
185 | } | |
186 | static DEVICE_ATTR_RO(set_cookie); | |
187 | ||
bf9bccc1 DW |
188 | resource_size_t nd_region_available_dpa(struct nd_region *nd_region) |
189 | { | |
190 | resource_size_t blk_max_overlap = 0, available, overlap; | |
191 | int i; | |
192 | ||
193 | WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev)); | |
194 | ||
195 | retry: | |
196 | available = 0; | |
197 | overlap = blk_max_overlap; | |
198 | for (i = 0; i < nd_region->ndr_mappings; i++) { | |
199 | struct nd_mapping *nd_mapping = &nd_region->mapping[i]; | |
200 | struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); | |
201 | ||
202 | /* if a dimm is disabled the available capacity is zero */ | |
203 | if (!ndd) | |
204 | return 0; | |
205 | ||
206 | if (is_nd_pmem(&nd_region->dev)) { | |
207 | available += nd_pmem_available_dpa(nd_region, | |
208 | nd_mapping, &overlap); | |
209 | if (overlap > blk_max_overlap) { | |
210 | blk_max_overlap = overlap; | |
211 | goto retry; | |
212 | } | |
213 | } else if (is_nd_blk(&nd_region->dev)) { | |
1b40e09a | 214 | available += nd_blk_available_dpa(nd_mapping); |
bf9bccc1 DW |
215 | } |
216 | } | |
217 | ||
218 | return available; | |
219 | } | |
220 | ||
221 | static ssize_t available_size_show(struct device *dev, | |
222 | struct device_attribute *attr, char *buf) | |
223 | { | |
224 | struct nd_region *nd_region = to_nd_region(dev); | |
225 | unsigned long long available = 0; | |
226 | ||
227 | /* | |
228 | * Flush in-flight updates and grab a snapshot of the available | |
229 | * size. Of course, this value is potentially invalidated the | |
230 | * memory nvdimm_bus_lock() is dropped, but that's userspace's | |
231 | * problem to not race itself. | |
232 | */ | |
233 | nvdimm_bus_lock(dev); | |
234 | wait_nvdimm_bus_probe_idle(dev); | |
235 | available = nd_region_available_dpa(nd_region); | |
236 | nvdimm_bus_unlock(dev); | |
237 | ||
238 | return sprintf(buf, "%llu\n", available); | |
239 | } | |
240 | static DEVICE_ATTR_RO(available_size); | |
241 | ||
3d88002e DW |
242 | static ssize_t init_namespaces_show(struct device *dev, |
243 | struct device_attribute *attr, char *buf) | |
244 | { | |
245 | struct nd_region_namespaces *num_ns = dev_get_drvdata(dev); | |
246 | ssize_t rc; | |
247 | ||
248 | nvdimm_bus_lock(dev); | |
249 | if (num_ns) | |
250 | rc = sprintf(buf, "%d/%d\n", num_ns->active, num_ns->count); | |
251 | else | |
252 | rc = -ENXIO; | |
253 | nvdimm_bus_unlock(dev); | |
254 | ||
255 | return rc; | |
256 | } | |
257 | static DEVICE_ATTR_RO(init_namespaces); | |
258 | ||
bf9bccc1 DW |
259 | static ssize_t namespace_seed_show(struct device *dev, |
260 | struct device_attribute *attr, char *buf) | |
261 | { | |
262 | struct nd_region *nd_region = to_nd_region(dev); | |
263 | ssize_t rc; | |
264 | ||
265 | nvdimm_bus_lock(dev); | |
266 | if (nd_region->ns_seed) | |
267 | rc = sprintf(buf, "%s\n", dev_name(nd_region->ns_seed)); | |
268 | else | |
269 | rc = sprintf(buf, "\n"); | |
270 | nvdimm_bus_unlock(dev); | |
271 | return rc; | |
272 | } | |
273 | static DEVICE_ATTR_RO(namespace_seed); | |
274 | ||
8c2f7e86 DW |
275 | static ssize_t btt_seed_show(struct device *dev, |
276 | struct device_attribute *attr, char *buf) | |
277 | { | |
278 | struct nd_region *nd_region = to_nd_region(dev); | |
279 | ssize_t rc; | |
280 | ||
281 | nvdimm_bus_lock(dev); | |
282 | if (nd_region->btt_seed) | |
283 | rc = sprintf(buf, "%s\n", dev_name(nd_region->btt_seed)); | |
284 | else | |
285 | rc = sprintf(buf, "\n"); | |
286 | nvdimm_bus_unlock(dev); | |
287 | ||
288 | return rc; | |
289 | } | |
290 | static DEVICE_ATTR_RO(btt_seed); | |
291 | ||
e1455744 DW |
292 | static ssize_t pfn_seed_show(struct device *dev, |
293 | struct device_attribute *attr, char *buf) | |
294 | { | |
295 | struct nd_region *nd_region = to_nd_region(dev); | |
296 | ssize_t rc; | |
297 | ||
298 | nvdimm_bus_lock(dev); | |
299 | if (nd_region->pfn_seed) | |
300 | rc = sprintf(buf, "%s\n", dev_name(nd_region->pfn_seed)); | |
301 | else | |
302 | rc = sprintf(buf, "\n"); | |
303 | nvdimm_bus_unlock(dev); | |
304 | ||
305 | return rc; | |
306 | } | |
307 | static DEVICE_ATTR_RO(pfn_seed); | |
308 | ||
58138820 DW |
309 | static ssize_t read_only_show(struct device *dev, |
310 | struct device_attribute *attr, char *buf) | |
311 | { | |
312 | struct nd_region *nd_region = to_nd_region(dev); | |
313 | ||
314 | return sprintf(buf, "%d\n", nd_region->ro); | |
315 | } | |
316 | ||
317 | static ssize_t read_only_store(struct device *dev, | |
318 | struct device_attribute *attr, const char *buf, size_t len) | |
319 | { | |
320 | bool ro; | |
321 | int rc = strtobool(buf, &ro); | |
322 | struct nd_region *nd_region = to_nd_region(dev); | |
323 | ||
324 | if (rc) | |
325 | return rc; | |
326 | ||
327 | nd_region->ro = ro; | |
328 | return len; | |
329 | } | |
330 | static DEVICE_ATTR_RW(read_only); | |
331 | ||
1f7df6f8 DW |
332 | static struct attribute *nd_region_attributes[] = { |
333 | &dev_attr_size.attr, | |
3d88002e | 334 | &dev_attr_nstype.attr, |
1f7df6f8 | 335 | &dev_attr_mappings.attr, |
8c2f7e86 | 336 | &dev_attr_btt_seed.attr, |
e1455744 | 337 | &dev_attr_pfn_seed.attr, |
58138820 | 338 | &dev_attr_read_only.attr, |
eaf96153 | 339 | &dev_attr_set_cookie.attr, |
bf9bccc1 DW |
340 | &dev_attr_available_size.attr, |
341 | &dev_attr_namespace_seed.attr, | |
3d88002e | 342 | &dev_attr_init_namespaces.attr, |
1f7df6f8 DW |
343 | NULL, |
344 | }; | |
345 | ||
eaf96153 DW |
346 | static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n) |
347 | { | |
348 | struct device *dev = container_of(kobj, typeof(*dev), kobj); | |
349 | struct nd_region *nd_region = to_nd_region(dev); | |
350 | struct nd_interleave_set *nd_set = nd_region->nd_set; | |
bf9bccc1 | 351 | int type = nd_region_to_nstype(nd_region); |
eaf96153 | 352 | |
6bb691ac DK |
353 | if (!is_nd_pmem(dev) && a == &dev_attr_pfn_seed.attr) |
354 | return 0; | |
355 | ||
bf9bccc1 DW |
356 | if (a != &dev_attr_set_cookie.attr |
357 | && a != &dev_attr_available_size.attr) | |
eaf96153 DW |
358 | return a->mode; |
359 | ||
bf9bccc1 DW |
360 | if ((type == ND_DEVICE_NAMESPACE_PMEM |
361 | || type == ND_DEVICE_NAMESPACE_BLK) | |
362 | && a == &dev_attr_available_size.attr) | |
363 | return a->mode; | |
364 | else if (is_nd_pmem(dev) && nd_set) | |
365 | return a->mode; | |
eaf96153 DW |
366 | |
367 | return 0; | |
368 | } | |
369 | ||
1f7df6f8 DW |
370 | struct attribute_group nd_region_attribute_group = { |
371 | .attrs = nd_region_attributes, | |
eaf96153 | 372 | .is_visible = region_visible, |
1f7df6f8 DW |
373 | }; |
374 | EXPORT_SYMBOL_GPL(nd_region_attribute_group); | |
375 | ||
bf9bccc1 DW |
376 | u64 nd_region_interleave_set_cookie(struct nd_region *nd_region) |
377 | { | |
378 | struct nd_interleave_set *nd_set = nd_region->nd_set; | |
379 | ||
380 | if (nd_set) | |
381 | return nd_set->cookie; | |
382 | return 0; | |
383 | } | |
384 | ||
eaf96153 DW |
385 | /* |
386 | * Upon successful probe/remove, take/release a reference on the | |
8c2f7e86 | 387 | * associated interleave set (if present), and plant new btt + namespace |
047fc8a1 RZ |
388 | * seeds. Also, on the removal of a BLK region, notify the provider to |
389 | * disable the region. | |
eaf96153 DW |
390 | */ |
391 | static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus, | |
392 | struct device *dev, bool probe) | |
393 | { | |
8c2f7e86 DW |
394 | struct nd_region *nd_region; |
395 | ||
bf9bccc1 | 396 | if (!probe && (is_nd_pmem(dev) || is_nd_blk(dev))) { |
eaf96153 DW |
397 | int i; |
398 | ||
8c2f7e86 | 399 | nd_region = to_nd_region(dev); |
eaf96153 DW |
400 | for (i = 0; i < nd_region->ndr_mappings; i++) { |
401 | struct nd_mapping *nd_mapping = &nd_region->mapping[i]; | |
bf9bccc1 | 402 | struct nvdimm_drvdata *ndd = nd_mapping->ndd; |
eaf96153 DW |
403 | struct nvdimm *nvdimm = nd_mapping->nvdimm; |
404 | ||
bf9bccc1 DW |
405 | kfree(nd_mapping->labels); |
406 | nd_mapping->labels = NULL; | |
407 | put_ndd(ndd); | |
408 | nd_mapping->ndd = NULL; | |
047fc8a1 RZ |
409 | if (ndd) |
410 | atomic_dec(&nvdimm->busy); | |
eaf96153 | 411 | } |
047fc8a1 RZ |
412 | |
413 | if (is_nd_pmem(dev)) | |
414 | return; | |
415 | ||
416 | to_nd_blk_region(dev)->disable(nvdimm_bus, dev); | |
8c2f7e86 DW |
417 | } |
418 | if (dev->parent && is_nd_blk(dev->parent) && probe) { | |
419 | nd_region = to_nd_region(dev->parent); | |
1b40e09a DW |
420 | nvdimm_bus_lock(dev); |
421 | if (nd_region->ns_seed == dev) | |
422 | nd_region_create_blk_seed(nd_region); | |
423 | nvdimm_bus_unlock(dev); | |
eaf96153 | 424 | } |
8c2f7e86 | 425 | if (is_nd_btt(dev) && probe) { |
8ca24353 DW |
426 | struct nd_btt *nd_btt = to_nd_btt(dev); |
427 | ||
8c2f7e86 DW |
428 | nd_region = to_nd_region(dev->parent); |
429 | nvdimm_bus_lock(dev); | |
430 | if (nd_region->btt_seed == dev) | |
431 | nd_region_create_btt_seed(nd_region); | |
8ca24353 DW |
432 | if (nd_region->ns_seed == &nd_btt->ndns->dev && |
433 | is_nd_blk(dev->parent)) | |
434 | nd_region_create_blk_seed(nd_region); | |
8c2f7e86 DW |
435 | nvdimm_bus_unlock(dev); |
436 | } | |
2dc43331 DW |
437 | if (is_nd_pfn(dev) && probe) { |
438 | nd_region = to_nd_region(dev->parent); | |
439 | nvdimm_bus_lock(dev); | |
440 | if (nd_region->pfn_seed == dev) | |
441 | nd_region_create_pfn_seed(nd_region); | |
442 | nvdimm_bus_unlock(dev); | |
443 | } | |
eaf96153 DW |
444 | } |
445 | ||
446 | void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev) | |
447 | { | |
448 | nd_region_notify_driver_action(nvdimm_bus, dev, true); | |
449 | } | |
450 | ||
451 | void nd_region_disable(struct nvdimm_bus *nvdimm_bus, struct device *dev) | |
452 | { | |
453 | nd_region_notify_driver_action(nvdimm_bus, dev, false); | |
454 | } | |
455 | ||
1f7df6f8 DW |
456 | static ssize_t mappingN(struct device *dev, char *buf, int n) |
457 | { | |
458 | struct nd_region *nd_region = to_nd_region(dev); | |
459 | struct nd_mapping *nd_mapping; | |
460 | struct nvdimm *nvdimm; | |
461 | ||
462 | if (n >= nd_region->ndr_mappings) | |
463 | return -ENXIO; | |
464 | nd_mapping = &nd_region->mapping[n]; | |
465 | nvdimm = nd_mapping->nvdimm; | |
466 | ||
467 | return sprintf(buf, "%s,%llu,%llu\n", dev_name(&nvdimm->dev), | |
468 | nd_mapping->start, nd_mapping->size); | |
469 | } | |
470 | ||
471 | #define REGION_MAPPING(idx) \ | |
472 | static ssize_t mapping##idx##_show(struct device *dev, \ | |
473 | struct device_attribute *attr, char *buf) \ | |
474 | { \ | |
475 | return mappingN(dev, buf, idx); \ | |
476 | } \ | |
477 | static DEVICE_ATTR_RO(mapping##idx) | |
478 | ||
479 | /* | |
480 | * 32 should be enough for a while, even in the presence of socket | |
481 | * interleave a 32-way interleave set is a degenerate case. | |
482 | */ | |
483 | REGION_MAPPING(0); | |
484 | REGION_MAPPING(1); | |
485 | REGION_MAPPING(2); | |
486 | REGION_MAPPING(3); | |
487 | REGION_MAPPING(4); | |
488 | REGION_MAPPING(5); | |
489 | REGION_MAPPING(6); | |
490 | REGION_MAPPING(7); | |
491 | REGION_MAPPING(8); | |
492 | REGION_MAPPING(9); | |
493 | REGION_MAPPING(10); | |
494 | REGION_MAPPING(11); | |
495 | REGION_MAPPING(12); | |
496 | REGION_MAPPING(13); | |
497 | REGION_MAPPING(14); | |
498 | REGION_MAPPING(15); | |
499 | REGION_MAPPING(16); | |
500 | REGION_MAPPING(17); | |
501 | REGION_MAPPING(18); | |
502 | REGION_MAPPING(19); | |
503 | REGION_MAPPING(20); | |
504 | REGION_MAPPING(21); | |
505 | REGION_MAPPING(22); | |
506 | REGION_MAPPING(23); | |
507 | REGION_MAPPING(24); | |
508 | REGION_MAPPING(25); | |
509 | REGION_MAPPING(26); | |
510 | REGION_MAPPING(27); | |
511 | REGION_MAPPING(28); | |
512 | REGION_MAPPING(29); | |
513 | REGION_MAPPING(30); | |
514 | REGION_MAPPING(31); | |
515 | ||
516 | static umode_t mapping_visible(struct kobject *kobj, struct attribute *a, int n) | |
517 | { | |
518 | struct device *dev = container_of(kobj, struct device, kobj); | |
519 | struct nd_region *nd_region = to_nd_region(dev); | |
520 | ||
521 | if (n < nd_region->ndr_mappings) | |
522 | return a->mode; | |
523 | return 0; | |
524 | } | |
525 | ||
526 | static struct attribute *mapping_attributes[] = { | |
527 | &dev_attr_mapping0.attr, | |
528 | &dev_attr_mapping1.attr, | |
529 | &dev_attr_mapping2.attr, | |
530 | &dev_attr_mapping3.attr, | |
531 | &dev_attr_mapping4.attr, | |
532 | &dev_attr_mapping5.attr, | |
533 | &dev_attr_mapping6.attr, | |
534 | &dev_attr_mapping7.attr, | |
535 | &dev_attr_mapping8.attr, | |
536 | &dev_attr_mapping9.attr, | |
537 | &dev_attr_mapping10.attr, | |
538 | &dev_attr_mapping11.attr, | |
539 | &dev_attr_mapping12.attr, | |
540 | &dev_attr_mapping13.attr, | |
541 | &dev_attr_mapping14.attr, | |
542 | &dev_attr_mapping15.attr, | |
543 | &dev_attr_mapping16.attr, | |
544 | &dev_attr_mapping17.attr, | |
545 | &dev_attr_mapping18.attr, | |
546 | &dev_attr_mapping19.attr, | |
547 | &dev_attr_mapping20.attr, | |
548 | &dev_attr_mapping21.attr, | |
549 | &dev_attr_mapping22.attr, | |
550 | &dev_attr_mapping23.attr, | |
551 | &dev_attr_mapping24.attr, | |
552 | &dev_attr_mapping25.attr, | |
553 | &dev_attr_mapping26.attr, | |
554 | &dev_attr_mapping27.attr, | |
555 | &dev_attr_mapping28.attr, | |
556 | &dev_attr_mapping29.attr, | |
557 | &dev_attr_mapping30.attr, | |
558 | &dev_attr_mapping31.attr, | |
559 | NULL, | |
560 | }; | |
561 | ||
562 | struct attribute_group nd_mapping_attribute_group = { | |
563 | .is_visible = mapping_visible, | |
564 | .attrs = mapping_attributes, | |
565 | }; | |
566 | EXPORT_SYMBOL_GPL(nd_mapping_attribute_group); | |
567 | ||
047fc8a1 | 568 | int nd_blk_region_init(struct nd_region *nd_region) |
1f7df6f8 | 569 | { |
047fc8a1 RZ |
570 | struct device *dev = &nd_region->dev; |
571 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
572 | ||
573 | if (!is_nd_blk(dev)) | |
574 | return 0; | |
575 | ||
576 | if (nd_region->ndr_mappings < 1) { | |
577 | dev_err(dev, "invalid BLK region\n"); | |
578 | return -ENXIO; | |
579 | } | |
580 | ||
581 | return to_nd_blk_region(dev)->enable(nvdimm_bus, dev); | |
1f7df6f8 | 582 | } |
1f7df6f8 | 583 | |
5212e11f VV |
584 | /** |
585 | * nd_region_acquire_lane - allocate and lock a lane | |
586 | * @nd_region: region id and number of lanes possible | |
587 | * | |
588 | * A lane correlates to a BLK-data-window and/or a log slot in the BTT. | |
589 | * We optimize for the common case where there are 256 lanes, one | |
590 | * per-cpu. For larger systems we need to lock to share lanes. For now | |
591 | * this implementation assumes the cost of maintaining an allocator for | |
592 | * free lanes is on the order of the lock hold time, so it implements a | |
593 | * static lane = cpu % num_lanes mapping. | |
594 | * | |
595 | * In the case of a BTT instance on top of a BLK namespace a lane may be | |
596 | * acquired recursively. We lock on the first instance. | |
597 | * | |
598 | * In the case of a BTT instance on top of PMEM, we only acquire a lane | |
599 | * for the BTT metadata updates. | |
600 | */ | |
601 | unsigned int nd_region_acquire_lane(struct nd_region *nd_region) | |
602 | { | |
603 | unsigned int cpu, lane; | |
604 | ||
605 | cpu = get_cpu(); | |
606 | if (nd_region->num_lanes < nr_cpu_ids) { | |
607 | struct nd_percpu_lane *ndl_lock, *ndl_count; | |
608 | ||
609 | lane = cpu % nd_region->num_lanes; | |
610 | ndl_count = per_cpu_ptr(nd_region->lane, cpu); | |
611 | ndl_lock = per_cpu_ptr(nd_region->lane, lane); | |
612 | if (ndl_count->count++ == 0) | |
613 | spin_lock(&ndl_lock->lock); | |
614 | } else | |
615 | lane = cpu; | |
616 | ||
617 | return lane; | |
618 | } | |
619 | EXPORT_SYMBOL(nd_region_acquire_lane); | |
620 | ||
621 | void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane) | |
622 | { | |
623 | if (nd_region->num_lanes < nr_cpu_ids) { | |
624 | unsigned int cpu = get_cpu(); | |
625 | struct nd_percpu_lane *ndl_lock, *ndl_count; | |
626 | ||
627 | ndl_count = per_cpu_ptr(nd_region->lane, cpu); | |
628 | ndl_lock = per_cpu_ptr(nd_region->lane, lane); | |
629 | if (--ndl_count->count == 0) | |
630 | spin_unlock(&ndl_lock->lock); | |
631 | put_cpu(); | |
632 | } | |
633 | put_cpu(); | |
634 | } | |
635 | EXPORT_SYMBOL(nd_region_release_lane); | |
636 | ||
1f7df6f8 DW |
637 | static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus, |
638 | struct nd_region_desc *ndr_desc, struct device_type *dev_type, | |
639 | const char *caller) | |
640 | { | |
641 | struct nd_region *nd_region; | |
642 | struct device *dev; | |
047fc8a1 | 643 | void *region_buf; |
5212e11f | 644 | unsigned int i; |
58138820 | 645 | int ro = 0; |
1f7df6f8 DW |
646 | |
647 | for (i = 0; i < ndr_desc->num_mappings; i++) { | |
648 | struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i]; | |
649 | struct nvdimm *nvdimm = nd_mapping->nvdimm; | |
650 | ||
651 | if ((nd_mapping->start | nd_mapping->size) % SZ_4K) { | |
652 | dev_err(&nvdimm_bus->dev, "%s: %s mapping%d is not 4K aligned\n", | |
653 | caller, dev_name(&nvdimm->dev), i); | |
654 | ||
655 | return NULL; | |
656 | } | |
58138820 DW |
657 | |
658 | if (nvdimm->flags & NDD_UNARMED) | |
659 | ro = 1; | |
1f7df6f8 DW |
660 | } |
661 | ||
047fc8a1 RZ |
662 | if (dev_type == &nd_blk_device_type) { |
663 | struct nd_blk_region_desc *ndbr_desc; | |
664 | struct nd_blk_region *ndbr; | |
665 | ||
666 | ndbr_desc = to_blk_region_desc(ndr_desc); | |
667 | ndbr = kzalloc(sizeof(*ndbr) + sizeof(struct nd_mapping) | |
668 | * ndr_desc->num_mappings, | |
669 | GFP_KERNEL); | |
670 | if (ndbr) { | |
671 | nd_region = &ndbr->nd_region; | |
672 | ndbr->enable = ndbr_desc->enable; | |
673 | ndbr->disable = ndbr_desc->disable; | |
674 | ndbr->do_io = ndbr_desc->do_io; | |
675 | } | |
676 | region_buf = ndbr; | |
677 | } else { | |
678 | nd_region = kzalloc(sizeof(struct nd_region) | |
679 | + sizeof(struct nd_mapping) | |
680 | * ndr_desc->num_mappings, | |
681 | GFP_KERNEL); | |
682 | region_buf = nd_region; | |
683 | } | |
684 | ||
685 | if (!region_buf) | |
1f7df6f8 DW |
686 | return NULL; |
687 | nd_region->id = ida_simple_get(®ion_ida, 0, 0, GFP_KERNEL); | |
5212e11f VV |
688 | if (nd_region->id < 0) |
689 | goto err_id; | |
690 | ||
691 | nd_region->lane = alloc_percpu(struct nd_percpu_lane); | |
692 | if (!nd_region->lane) | |
693 | goto err_percpu; | |
694 | ||
695 | for (i = 0; i < nr_cpu_ids; i++) { | |
696 | struct nd_percpu_lane *ndl; | |
697 | ||
698 | ndl = per_cpu_ptr(nd_region->lane, i); | |
699 | spin_lock_init(&ndl->lock); | |
700 | ndl->count = 0; | |
1f7df6f8 DW |
701 | } |
702 | ||
703 | memcpy(nd_region->mapping, ndr_desc->nd_mapping, | |
704 | sizeof(struct nd_mapping) * ndr_desc->num_mappings); | |
705 | for (i = 0; i < ndr_desc->num_mappings; i++) { | |
706 | struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i]; | |
707 | struct nvdimm *nvdimm = nd_mapping->nvdimm; | |
708 | ||
709 | get_device(&nvdimm->dev); | |
710 | } | |
711 | nd_region->ndr_mappings = ndr_desc->num_mappings; | |
712 | nd_region->provider_data = ndr_desc->provider_data; | |
eaf96153 | 713 | nd_region->nd_set = ndr_desc->nd_set; |
5212e11f | 714 | nd_region->num_lanes = ndr_desc->num_lanes; |
004f1afb | 715 | nd_region->flags = ndr_desc->flags; |
58138820 | 716 | nd_region->ro = ro; |
41d7a6d6 | 717 | nd_region->numa_node = ndr_desc->numa_node; |
1b40e09a | 718 | ida_init(&nd_region->ns_ida); |
8c2f7e86 | 719 | ida_init(&nd_region->btt_ida); |
e1455744 | 720 | ida_init(&nd_region->pfn_ida); |
1f7df6f8 DW |
721 | dev = &nd_region->dev; |
722 | dev_set_name(dev, "region%d", nd_region->id); | |
723 | dev->parent = &nvdimm_bus->dev; | |
724 | dev->type = dev_type; | |
725 | dev->groups = ndr_desc->attr_groups; | |
726 | nd_region->ndr_size = resource_size(ndr_desc->res); | |
727 | nd_region->ndr_start = ndr_desc->res->start; | |
728 | nd_device_register(dev); | |
729 | ||
730 | return nd_region; | |
5212e11f VV |
731 | |
732 | err_percpu: | |
733 | ida_simple_remove(®ion_ida, nd_region->id); | |
734 | err_id: | |
047fc8a1 | 735 | kfree(region_buf); |
5212e11f | 736 | return NULL; |
1f7df6f8 DW |
737 | } |
738 | ||
739 | struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus, | |
740 | struct nd_region_desc *ndr_desc) | |
741 | { | |
5212e11f | 742 | ndr_desc->num_lanes = ND_MAX_LANES; |
1f7df6f8 DW |
743 | return nd_region_create(nvdimm_bus, ndr_desc, &nd_pmem_device_type, |
744 | __func__); | |
745 | } | |
746 | EXPORT_SYMBOL_GPL(nvdimm_pmem_region_create); | |
747 | ||
748 | struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus, | |
749 | struct nd_region_desc *ndr_desc) | |
750 | { | |
751 | if (ndr_desc->num_mappings > 1) | |
752 | return NULL; | |
5212e11f | 753 | ndr_desc->num_lanes = min(ndr_desc->num_lanes, ND_MAX_LANES); |
1f7df6f8 DW |
754 | return nd_region_create(nvdimm_bus, ndr_desc, &nd_blk_device_type, |
755 | __func__); | |
756 | } | |
757 | EXPORT_SYMBOL_GPL(nvdimm_blk_region_create); | |
758 | ||
759 | struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus, | |
760 | struct nd_region_desc *ndr_desc) | |
761 | { | |
5212e11f | 762 | ndr_desc->num_lanes = ND_MAX_LANES; |
1f7df6f8 DW |
763 | return nd_region_create(nvdimm_bus, ndr_desc, &nd_volatile_device_type, |
764 | __func__); | |
765 | } | |
766 | EXPORT_SYMBOL_GPL(nvdimm_volatile_region_create); |