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Merge tag 'trace-printf-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...
[drm/drm-misc.git] / drivers / nvdimm / namespace_devs.c
blob55cfbf1e0a95611e662c6e277e0831fb2ed5b0d8
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
4 */
5 #include <linux/kstrtox.h>
6 #include <linux/module.h>
7 #include <linux/device.h>
8 #include <linux/sort.h>
9 #include <linux/slab.h>
10 #include <linux/list.h>
11 #include <linux/nd.h>
12 #include "nd-core.h"
13 #include "pmem.h"
14 #include "pfn.h"
15 #include "nd.h"
16
17 static void namespace_io_release(struct device *dev)
18 {
19 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
20
21 kfree(nsio);
22 }
23
24 static void namespace_pmem_release(struct device *dev)
25 {
26 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
27 struct nd_region *nd_region = to_nd_region(dev->parent);
28
29 if (nspm->id >= 0)
30 ida_free(&nd_region->ns_ida, nspm->id);
31 kfree(nspm->alt_name);
32 kfree(nspm->uuid);
33 kfree(nspm);
34 }
35
36 static bool is_namespace_pmem(const struct device *dev);
37 static bool is_namespace_io(const struct device *dev);
38
39 static int is_uuid_busy(struct device *dev, void *data)
40 {
41 uuid_t *uuid1 = data, *uuid2 = NULL;
42
43 if (is_namespace_pmem(dev)) {
44 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
45
46 uuid2 = nspm->uuid;
47 } else if (is_nd_btt(dev)) {
48 struct nd_btt *nd_btt = to_nd_btt(dev);
49
50 uuid2 = nd_btt->uuid;
51 } else if (is_nd_pfn(dev)) {
52 struct nd_pfn *nd_pfn = to_nd_pfn(dev);
53
54 uuid2 = nd_pfn->uuid;
55 }
56
57 if (uuid2 && uuid_equal(uuid1, uuid2))
58 return -EBUSY;
59
60 return 0;
61 }
62
63 static int is_namespace_uuid_busy(struct device *dev, void *data)
64 {
65 if (is_nd_region(dev))
66 return device_for_each_child(dev, data, is_uuid_busy);
67 return 0;
68 }
69
70 /**
71 * nd_is_uuid_unique - verify that no other namespace has @uuid
72 * @dev: any device on a nvdimm_bus
73 * @uuid: uuid to check
74 *
75 * Returns: %true if the uuid is unique, %false if not
76 */
77 bool nd_is_uuid_unique(struct device *dev, uuid_t *uuid)
78 {
79 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
80
81 if (!nvdimm_bus)
82 return false;
83 WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm_bus->dev));
84 if (device_for_each_child(&nvdimm_bus->dev, uuid,
85 is_namespace_uuid_busy) != 0)
86 return false;
87 return true;
88 }
89
90 bool pmem_should_map_pages(struct device *dev)
91 {
92 struct nd_region *nd_region = to_nd_region(dev->parent);
93 struct nd_namespace_common *ndns = to_ndns(dev);
94 struct nd_namespace_io *nsio;
95
96 if (!IS_ENABLED(CONFIG_ZONE_DEVICE))
97 return false;
98
99 if (!test_bit(ND_REGION_PAGEMAP, &nd_region->flags))
100 return false;
101
102 if (is_nd_pfn(dev) || is_nd_btt(dev))
103 return false;
104
105 if (ndns->force_raw)
106 return false;
107
108 nsio = to_nd_namespace_io(dev);
109 if (region_intersects(nsio->res.start, resource_size(&nsio->res),
110 IORESOURCE_SYSTEM_RAM,
111 IORES_DESC_NONE) == REGION_MIXED)
112 return false;
113
114 return ARCH_MEMREMAP_PMEM == MEMREMAP_WB;
115 }
116 EXPORT_SYMBOL(pmem_should_map_pages);
117
118 unsigned int pmem_sector_size(struct nd_namespace_common *ndns)
119 {
120 if (is_namespace_pmem(&ndns->dev)) {
121 struct nd_namespace_pmem *nspm;
122
123 nspm = to_nd_namespace_pmem(&ndns->dev);
124 if (nspm->lbasize == 0 || nspm->lbasize == 512)
125 /* default */;
126 else if (nspm->lbasize == 4096)
127 return 4096;
128 else
129 dev_WARN(&ndns->dev, "unsupported sector size: %ld\n",
130 nspm->lbasize);
131 }
132
133 /*
134 * There is no namespace label (is_namespace_io()), or the label
135 * indicates the default sector size.
136 */
137 return 512;
138 }
139 EXPORT_SYMBOL(pmem_sector_size);
140
141 const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
142 char *name)
143 {
144 struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
145 const char *suffix = NULL;
146
147 if (ndns->claim && is_nd_btt(ndns->claim))
148 suffix = "s";
149
150 if (is_namespace_pmem(&ndns->dev) || is_namespace_io(&ndns->dev)) {
151 int nsidx = 0;
152
153 if (is_namespace_pmem(&ndns->dev)) {
154 struct nd_namespace_pmem *nspm;
155
156 nspm = to_nd_namespace_pmem(&ndns->dev);
157 nsidx = nspm->id;
158 }
159
160 if (nsidx)
161 sprintf(name, "pmem%d.%d%s", nd_region->id, nsidx,
162 suffix ? suffix : "");
163 else
164 sprintf(name, "pmem%d%s", nd_region->id,
165 suffix ? suffix : "");
166 } else {
167 return NULL;
168 }
169
170 return name;
171 }
172 EXPORT_SYMBOL(nvdimm_namespace_disk_name);
173
174 const uuid_t *nd_dev_to_uuid(struct device *dev)
175 {
176 if (dev && is_namespace_pmem(dev)) {
177 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
178
179 return nspm->uuid;
180 }
181 return &uuid_null;
182 }
183 EXPORT_SYMBOL(nd_dev_to_uuid);
184
185 static ssize_t nstype_show(struct device *dev,
186 struct device_attribute *attr, char *buf)
187 {
188 struct nd_region *nd_region = to_nd_region(dev->parent);
189
190 return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region));
191 }
192 static DEVICE_ATTR_RO(nstype);
193
194 static ssize_t __alt_name_store(struct device *dev, const char *buf,
195 const size_t len)
196 {
197 char *input, *pos, *alt_name, **ns_altname;
198 ssize_t rc;
199
200 if (is_namespace_pmem(dev)) {
201 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
202
203 ns_altname = &nspm->alt_name;
204 } else
205 return -ENXIO;
206
207 if (dev->driver || to_ndns(dev)->claim)
208 return -EBUSY;
209
210 input = kstrndup(buf, len, GFP_KERNEL);
211 if (!input)
212 return -ENOMEM;
213
214 pos = strim(input);
215 if (strlen(pos) + 1 > NSLABEL_NAME_LEN) {
216 rc = -EINVAL;
217 goto out;
218 }
219
220 alt_name = kzalloc(NSLABEL_NAME_LEN, GFP_KERNEL);
221 if (!alt_name) {
222 rc = -ENOMEM;
223 goto out;
224 }
225 kfree(*ns_altname);
226 *ns_altname = alt_name;
227 sprintf(*ns_altname, "%s", pos);
228 rc = len;
229
230 out:
231 kfree(input);
232 return rc;
233 }
234
235 static int nd_namespace_label_update(struct nd_region *nd_region,
236 struct device *dev)
237 {
238 dev_WARN_ONCE(dev, dev->driver || to_ndns(dev)->claim,
239 "namespace must be idle during label update\n");
240 if (dev->driver || to_ndns(dev)->claim)
241 return 0;
242
243 /*
244 * Only allow label writes that will result in a valid namespace
245 * or deletion of an existing namespace.
246 */
247 if (is_namespace_pmem(dev)) {
248 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
249 resource_size_t size = resource_size(&nspm->nsio.res);
250
251 if (size == 0 && nspm->uuid)
252 /* delete allocation */;
253 else if (!nspm->uuid)
254 return 0;
255
256 return nd_pmem_namespace_label_update(nd_region, nspm, size);
257 } else
258 return -ENXIO;
259 }
260
261 static ssize_t alt_name_store(struct device *dev,
262 struct device_attribute *attr, const char *buf, size_t len)
263 {
264 struct nd_region *nd_region = to_nd_region(dev->parent);
265 ssize_t rc;
266
267 device_lock(dev);
268 nvdimm_bus_lock(dev);
269 wait_nvdimm_bus_probe_idle(dev);
270 rc = __alt_name_store(dev, buf, len);
271 if (rc >= 0)
272 rc = nd_namespace_label_update(nd_region, dev);
273 dev_dbg(dev, "%s(%zd)\n", rc < 0 ? "fail " : "", rc);
274 nvdimm_bus_unlock(dev);
275 device_unlock(dev);
276
277 return rc < 0 ? rc : len;
278 }
279
280 static ssize_t alt_name_show(struct device *dev,
281 struct device_attribute *attr, char *buf)
282 {
283 char *ns_altname;
284
285 if (is_namespace_pmem(dev)) {
286 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
287
288 ns_altname = nspm->alt_name;
289 } else
290 return -ENXIO;
291
292 return sprintf(buf, "%s\n", ns_altname ? ns_altname : "");
293 }
294 static DEVICE_ATTR_RW(alt_name);
295
296 static int scan_free(struct nd_region *nd_region,
297 struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
298 resource_size_t n)
299 {
300 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
301 int rc = 0;
302
303 while (n) {
304 struct resource *res, *last;
305
306 last = NULL;
307 for_each_dpa_resource(ndd, res)
308 if (strcmp(res->name, label_id->id) == 0)
309 last = res;
310 res = last;
311 if (!res)
312 return 0;
313
314 if (n >= resource_size(res)) {
315 n -= resource_size(res);
316 nd_dbg_dpa(nd_region, ndd, res, "delete %d\n", rc);
317 nvdimm_free_dpa(ndd, res);
318 /* retry with last resource deleted */
319 continue;
320 }
321
322 rc = adjust_resource(res, res->start, resource_size(res) - n);
323 if (rc == 0)
324 res->flags |= DPA_RESOURCE_ADJUSTED;
325 nd_dbg_dpa(nd_region, ndd, res, "shrink %d\n", rc);
326 break;
327 }
328
329 return rc;
330 }
331
332 /**
333 * shrink_dpa_allocation - for each dimm in region free n bytes for label_id
334 * @nd_region: the set of dimms to reclaim @n bytes from
335 * @label_id: unique identifier for the namespace consuming this dpa range
336 * @n: number of bytes per-dimm to release
337 *
338 * Assumes resources are ordered. Starting from the end try to
339 * adjust_resource() the allocation to @n, but if @n is larger than the
340 * allocation delete it and find the 'new' last allocation in the label
341 * set.
342 *
343 * Returns: %0 on success on -errno on error
344 */
345 static int shrink_dpa_allocation(struct nd_region *nd_region,
346 struct nd_label_id *label_id, resource_size_t n)
347 {
348 int i;
349
350 for (i = 0; i < nd_region->ndr_mappings; i++) {
351 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
352 int rc;
353
354 rc = scan_free(nd_region, nd_mapping, label_id, n);
355 if (rc)
356 return rc;
357 }
358
359 return 0;
360 }
361
362 static resource_size_t init_dpa_allocation(struct nd_label_id *label_id,
363 struct nd_region *nd_region, struct nd_mapping *nd_mapping,
364 resource_size_t n)
365 {
366 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
367 struct resource *res;
368 int rc = 0;
369
370 /* first resource allocation for this label-id or dimm */
371 res = nvdimm_allocate_dpa(ndd, label_id, nd_mapping->start, n);
372 if (!res)
373 rc = -EBUSY;
374
375 nd_dbg_dpa(nd_region, ndd, res, "init %d\n", rc);
376 return rc ? n : 0;
377 }
378
379
380 /**
381 * space_valid() - validate free dpa space against constraints
382 * @nd_region: hosting region of the free space
383 * @ndd: dimm device data for debug
384 * @label_id: namespace id to allocate space
385 * @prev: potential allocation that precedes free space
386 * @next: allocation that follows the given free space range
387 * @exist: first allocation with same id in the mapping
388 * @n: range that must satisfied for pmem allocations
389 * @valid: free space range to validate
390 *
391 * BLK-space is valid as long as it does not precede a PMEM
392 * allocation in a given region. PMEM-space must be contiguous
393 * and adjacent to an existing allocation (if one
394 * exists). If reserving PMEM any space is valid.
395 */
396 static void space_valid(struct nd_region *nd_region, struct nvdimm_drvdata *ndd,
397 struct nd_label_id *label_id, struct resource *prev,
398 struct resource *next, struct resource *exist,
399 resource_size_t n, struct resource *valid)
400 {
401 bool is_reserve = strcmp(label_id->id, "pmem-reserve") == 0;
402 unsigned long align;
403
404 align = nd_region->align / nd_region->ndr_mappings;
405 valid->start = ALIGN(valid->start, align);
406 valid->end = ALIGN_DOWN(valid->end + 1, align) - 1;
407
408 if (valid->start >= valid->end)
409 goto invalid;
410
411 if (is_reserve)
412 return;
413
414 /* allocation needs to be contiguous, so this is all or nothing */
415 if (resource_size(valid) < n)
416 goto invalid;
417
418 /* we've got all the space we need and no existing allocation */
419 if (!exist)
420 return;
421
422 /* allocation needs to be contiguous with the existing namespace */
423 if (valid->start == exist->end + 1
424 || valid->end == exist->start - 1)
425 return;
426
427 invalid:
428 /* truncate @valid size to 0 */
429 valid->end = valid->start - 1;
430 }
431
432 enum alloc_loc {
433 ALLOC_ERR = 0, ALLOC_BEFORE, ALLOC_MID, ALLOC_AFTER,
434 };
435
436 static resource_size_t scan_allocate(struct nd_region *nd_region,
437 struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
438 resource_size_t n)
439 {
440 resource_size_t mapping_end = nd_mapping->start + nd_mapping->size - 1;
441 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
442 struct resource *res, *exist = NULL, valid;
443 const resource_size_t to_allocate = n;
444 int first;
445
446 for_each_dpa_resource(ndd, res)
447 if (strcmp(label_id->id, res->name) == 0)
448 exist = res;
449
450 valid.start = nd_mapping->start;
451 valid.end = mapping_end;
452 valid.name = "free space";
453 retry:
454 first = 0;
455 for_each_dpa_resource(ndd, res) {
456 struct resource *next = res->sibling, *new_res = NULL;
457 resource_size_t allocate, available = 0;
458 enum alloc_loc loc = ALLOC_ERR;
459 const char *action;
460 int rc = 0;
461
462 /* ignore resources outside this nd_mapping */
463 if (res->start > mapping_end)
464 continue;
465 if (res->end < nd_mapping->start)
466 continue;
467
468 /* space at the beginning of the mapping */
469 if (!first++ && res->start > nd_mapping->start) {
470 valid.start = nd_mapping->start;
471 valid.end = res->start - 1;
472 space_valid(nd_region, ndd, label_id, NULL, next, exist,
473 to_allocate, &valid);
474 available = resource_size(&valid);
475 if (available)
476 loc = ALLOC_BEFORE;
477 }
478
479 /* space between allocations */
480 if (!loc && next) {
481 valid.start = res->start + resource_size(res);
482 valid.end = min(mapping_end, next->start - 1);
483 space_valid(nd_region, ndd, label_id, res, next, exist,
484 to_allocate, &valid);
485 available = resource_size(&valid);
486 if (available)
487 loc = ALLOC_MID;
488 }
489
490 /* space at the end of the mapping */
491 if (!loc && !next) {
492 valid.start = res->start + resource_size(res);
493 valid.end = mapping_end;
494 space_valid(nd_region, ndd, label_id, res, next, exist,
495 to_allocate, &valid);
496 available = resource_size(&valid);
497 if (available)
498 loc = ALLOC_AFTER;
499 }
500
501 if (!loc || !available)
502 continue;
503 allocate = min(available, n);
504 switch (loc) {
505 case ALLOC_BEFORE:
506 if (strcmp(res->name, label_id->id) == 0) {
507 /* adjust current resource up */
508 rc = adjust_resource(res, res->start - allocate,
509 resource_size(res) + allocate);
510 action = "cur grow up";
511 } else
512 action = "allocate";
513 break;
514 case ALLOC_MID:
515 if (strcmp(next->name, label_id->id) == 0) {
516 /* adjust next resource up */
517 rc = adjust_resource(next, next->start
518 - allocate, resource_size(next)
519 + allocate);
520 new_res = next;
521 action = "next grow up";
522 } else if (strcmp(res->name, label_id->id) == 0) {
523 action = "grow down";
524 } else
525 action = "allocate";
526 break;
527 case ALLOC_AFTER:
528 if (strcmp(res->name, label_id->id) == 0)
529 action = "grow down";
530 else
531 action = "allocate";
532 break;
533 default:
534 return n;
535 }
536
537 if (strcmp(action, "allocate") == 0) {
538 new_res = nvdimm_allocate_dpa(ndd, label_id,
539 valid.start, allocate);
540 if (!new_res)
541 rc = -EBUSY;
542 } else if (strcmp(action, "grow down") == 0) {
543 /* adjust current resource down */
544 rc = adjust_resource(res, res->start, resource_size(res)
545 + allocate);
546 if (rc == 0)
547 res->flags |= DPA_RESOURCE_ADJUSTED;
548 }
549
550 if (!new_res)
551 new_res = res;
552
553 nd_dbg_dpa(nd_region, ndd, new_res, "%s(%d) %d\n",
554 action, loc, rc);
555
556 if (rc)
557 return n;
558
559 n -= allocate;
560 if (n) {
561 /*
562 * Retry scan with newly inserted resources.
563 * For example, if we did an ALLOC_BEFORE
564 * insertion there may also have been space
565 * available for an ALLOC_AFTER insertion, so we
566 * need to check this same resource again
567 */
568 goto retry;
569 } else
570 return 0;
571 }
572
573 if (n == to_allocate)
574 return init_dpa_allocation(label_id, nd_region, nd_mapping, n);
575 return n;
576 }
577
578 static int merge_dpa(struct nd_region *nd_region,
579 struct nd_mapping *nd_mapping, struct nd_label_id *label_id)
580 {
581 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
582 struct resource *res;
583
584 if (strncmp("pmem", label_id->id, 4) == 0)
585 return 0;
586 retry:
587 for_each_dpa_resource(ndd, res) {
588 int rc;
589 struct resource *next = res->sibling;
590 resource_size_t end = res->start + resource_size(res);
591
592 if (!next || strcmp(res->name, label_id->id) != 0
593 || strcmp(next->name, label_id->id) != 0
594 || end != next->start)
595 continue;
596 end += resource_size(next);
597 nvdimm_free_dpa(ndd, next);
598 rc = adjust_resource(res, res->start, end - res->start);
599 nd_dbg_dpa(nd_region, ndd, res, "merge %d\n", rc);
600 if (rc)
601 return rc;
602 res->flags |= DPA_RESOURCE_ADJUSTED;
603 goto retry;
604 }
605
606 return 0;
607 }
608
609 int __reserve_free_pmem(struct device *dev, void *data)
610 {
611 struct nvdimm *nvdimm = data;
612 struct nd_region *nd_region;
613 struct nd_label_id label_id;
614 int i;
615
616 if (!is_memory(dev))
617 return 0;
618
619 nd_region = to_nd_region(dev);
620 if (nd_region->ndr_mappings == 0)
621 return 0;
622
623 memset(&label_id, 0, sizeof(label_id));
624 strcat(label_id.id, "pmem-reserve");
625 for (i = 0; i < nd_region->ndr_mappings; i++) {
626 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
627 resource_size_t n, rem = 0;
628
629 if (nd_mapping->nvdimm != nvdimm)
630 continue;
631
632 n = nd_pmem_available_dpa(nd_region, nd_mapping);
633 if (n == 0)
634 return 0;
635 rem = scan_allocate(nd_region, nd_mapping, &label_id, n);
636 dev_WARN_ONCE(&nd_region->dev, rem,
637 "pmem reserve underrun: %#llx of %#llx bytes\n",
638 (unsigned long long) n - rem,
639 (unsigned long long) n);
640 return rem ? -ENXIO : 0;
641 }
642
643 return 0;
644 }
645
646 void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
647 struct nd_mapping *nd_mapping)
648 {
649 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
650 struct resource *res, *_res;
651
652 for_each_dpa_resource_safe(ndd, res, _res)
653 if (strcmp(res->name, "pmem-reserve") == 0)
654 nvdimm_free_dpa(ndd, res);
655 }
656
657 /**
658 * grow_dpa_allocation - for each dimm allocate n bytes for @label_id
659 * @nd_region: the set of dimms to allocate @n more bytes from
660 * @label_id: unique identifier for the namespace consuming this dpa range
661 * @n: number of bytes per-dimm to add to the existing allocation
662 *
663 * Assumes resources are ordered. For BLK regions, first consume
664 * BLK-only available DPA free space, then consume PMEM-aliased DPA
665 * space starting at the highest DPA. For PMEM regions start
666 * allocations from the start of an interleave set and end at the first
667 * BLK allocation or the end of the interleave set, whichever comes
668 * first.
669 *
670 * Returns: %0 on success on -errno on error
671 */
672 static int grow_dpa_allocation(struct nd_region *nd_region,
673 struct nd_label_id *label_id, resource_size_t n)
674 {
675 int i;
676
677 for (i = 0; i < nd_region->ndr_mappings; i++) {
678 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
679 resource_size_t rem = n;
680 int rc;
681
682 rem = scan_allocate(nd_region, nd_mapping, label_id, rem);
683 dev_WARN_ONCE(&nd_region->dev, rem,
684 "allocation underrun: %#llx of %#llx bytes\n",
685 (unsigned long long) n - rem,
686 (unsigned long long) n);
687 if (rem)
688 return -ENXIO;
689
690 rc = merge_dpa(nd_region, nd_mapping, label_id);
691 if (rc)
692 return rc;
693 }
694
695 return 0;
696 }
697
698 static void nd_namespace_pmem_set_resource(struct nd_region *nd_region,
699 struct nd_namespace_pmem *nspm, resource_size_t size)
700 {
701 struct resource *res = &nspm->nsio.res;
702 resource_size_t offset = 0;
703
704 if (size && !nspm->uuid) {
705 WARN_ON_ONCE(1);
706 size = 0;
707 }
708
709 if (size && nspm->uuid) {
710 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
711 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
712 struct nd_label_id label_id;
713 struct resource *res;
714
715 if (!ndd) {
716 size = 0;
717 goto out;
718 }
719
720 nd_label_gen_id(&label_id, nspm->uuid, 0);
721
722 /* calculate a spa offset from the dpa allocation offset */
723 for_each_dpa_resource(ndd, res)
724 if (strcmp(res->name, label_id.id) == 0) {
725 offset = (res->start - nd_mapping->start)
726 * nd_region->ndr_mappings;
727 goto out;
728 }
729
730 WARN_ON_ONCE(1);
731 size = 0;
732 }
733
734 out:
735 res->start = nd_region->ndr_start + offset;
736 res->end = res->start + size - 1;
737 }
738
739 static bool uuid_not_set(const uuid_t *uuid, struct device *dev,
740 const char *where)
741 {
742 if (!uuid) {
743 dev_dbg(dev, "%s: uuid not set\n", where);
744 return true;
745 }
746 return false;
747 }
748
749 static ssize_t __size_store(struct device *dev, unsigned long long val)
750 {
751 resource_size_t allocated = 0, available = 0;
752 struct nd_region *nd_region = to_nd_region(dev->parent);
753 struct nd_namespace_common *ndns = to_ndns(dev);
754 struct nd_mapping *nd_mapping;
755 struct nvdimm_drvdata *ndd;
756 struct nd_label_id label_id;
757 u32 flags = 0, remainder;
758 int rc, i, id = -1;
759 uuid_t *uuid = NULL;
760
761 if (dev->driver || ndns->claim)
762 return -EBUSY;
763
764 if (is_namespace_pmem(dev)) {
765 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
766
767 uuid = nspm->uuid;
768 id = nspm->id;
769 }
770
771 /*
772 * We need a uuid for the allocation-label and dimm(s) on which
773 * to store the label.
774 */
775 if (uuid_not_set(uuid, dev, __func__))
776 return -ENXIO;
777 if (nd_region->ndr_mappings == 0) {
778 dev_dbg(dev, "not associated with dimm(s)\n");
779 return -ENXIO;
780 }
781
782 div_u64_rem(val, nd_region->align, &remainder);
783 if (remainder) {
784 dev_dbg(dev, "%llu is not %ldK aligned\n", val,
785 nd_region->align / SZ_1K);
786 return -EINVAL;
787 }
788
789 nd_label_gen_id(&label_id, uuid, flags);
790 for (i = 0; i < nd_region->ndr_mappings; i++) {
791 nd_mapping = &nd_region->mapping[i];
792 ndd = to_ndd(nd_mapping);
793
794 /*
795 * All dimms in an interleave set, need to be enabled
796 * for the size to be changed.
797 */
798 if (!ndd)
799 return -ENXIO;
800
801 allocated += nvdimm_allocated_dpa(ndd, &label_id);
802 }
803 available = nd_region_allocatable_dpa(nd_region);
804
805 if (val > available + allocated)
806 return -ENOSPC;
807
808 if (val == allocated)
809 return 0;
810
811 val = div_u64(val, nd_region->ndr_mappings);
812 allocated = div_u64(allocated, nd_region->ndr_mappings);
813 if (val < allocated)
814 rc = shrink_dpa_allocation(nd_region, &label_id,
815 allocated - val);
816 else
817 rc = grow_dpa_allocation(nd_region, &label_id, val - allocated);
818
819 if (rc)
820 return rc;
821
822 if (is_namespace_pmem(dev)) {
823 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
824
825 nd_namespace_pmem_set_resource(nd_region, nspm,
826 val * nd_region->ndr_mappings);
827 }
828
829 /*
830 * Try to delete the namespace if we deleted all of its
831 * allocation, this is not the seed or 0th device for the
832 * region, and it is not actively claimed by a btt, pfn, or dax
833 * instance.
834 */
835 if (val == 0 && id != 0 && nd_region->ns_seed != dev && !ndns->claim)
836 nd_device_unregister(dev, ND_ASYNC);
837
838 return rc;
839 }
840
841 static ssize_t size_store(struct device *dev,
842 struct device_attribute *attr, const char *buf, size_t len)
843 {
844 struct nd_region *nd_region = to_nd_region(dev->parent);
845 unsigned long long val;
846 int rc;
847
848 rc = kstrtoull(buf, 0, &val);
849 if (rc)
850 return rc;
851
852 device_lock(dev);
853 nvdimm_bus_lock(dev);
854 wait_nvdimm_bus_probe_idle(dev);
855 rc = __size_store(dev, val);
856 if (rc >= 0)
857 rc = nd_namespace_label_update(nd_region, dev);
858
859 /* setting size zero == 'delete namespace' */
860 if (rc == 0 && val == 0 && is_namespace_pmem(dev)) {
861 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
862
863 kfree(nspm->uuid);
864 nspm->uuid = NULL;
865 }
866
867 dev_dbg(dev, "%llx %s (%d)\n", val, rc < 0 ? "fail" : "success", rc);
868
869 nvdimm_bus_unlock(dev);
870 device_unlock(dev);
871
872 return rc < 0 ? rc : len;
873 }
874
875 resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
876 {
877 struct device *dev = &ndns->dev;
878
879 if (is_namespace_pmem(dev)) {
880 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
881
882 return resource_size(&nspm->nsio.res);
883 } else if (is_namespace_io(dev)) {
884 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
885
886 return resource_size(&nsio->res);
887 } else
888 WARN_ONCE(1, "unknown namespace type\n");
889 return 0;
890 }
891
892 resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
893 {
894 resource_size_t size;
895
896 nvdimm_bus_lock(&ndns->dev);
897 size = __nvdimm_namespace_capacity(ndns);
898 nvdimm_bus_unlock(&ndns->dev);
899
900 return size;
901 }
902 EXPORT_SYMBOL(nvdimm_namespace_capacity);
903
904 bool nvdimm_namespace_locked(struct nd_namespace_common *ndns)
905 {
906 int i;
907 bool locked = false;
908 struct device *dev = &ndns->dev;
909 struct nd_region *nd_region = to_nd_region(dev->parent);
910
911 for (i = 0; i < nd_region->ndr_mappings; i++) {
912 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
913 struct nvdimm *nvdimm = nd_mapping->nvdimm;
914
915 if (test_bit(NDD_LOCKED, &nvdimm->flags)) {
916 dev_dbg(dev, "%s locked\n", nvdimm_name(nvdimm));
917 locked = true;
918 }
919 }
920 return locked;
921 }
922 EXPORT_SYMBOL(nvdimm_namespace_locked);
923
924 static ssize_t size_show(struct device *dev,
925 struct device_attribute *attr, char *buf)
926 {
927 return sprintf(buf, "%llu\n", (unsigned long long)
928 nvdimm_namespace_capacity(to_ndns(dev)));
929 }
930 static DEVICE_ATTR(size, 0444, size_show, size_store);
931
932 static uuid_t *namespace_to_uuid(struct device *dev)
933 {
934 if (is_namespace_pmem(dev)) {
935 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
936
937 return nspm->uuid;
938 }
939 return ERR_PTR(-ENXIO);
940 }
941
942 static ssize_t uuid_show(struct device *dev, struct device_attribute *attr,
943 char *buf)
944 {
945 uuid_t *uuid = namespace_to_uuid(dev);
946
947 if (IS_ERR(uuid))
948 return PTR_ERR(uuid);
949 if (uuid)
950 return sprintf(buf, "%pUb\n", uuid);
951 return sprintf(buf, "\n");
952 }
953
954 /**
955 * namespace_update_uuid - check for a unique uuid and whether we're "renaming"
956 * @nd_region: parent region so we can updates all dimms in the set
957 * @dev: namespace type for generating label_id
958 * @new_uuid: incoming uuid
959 * @old_uuid: reference to the uuid storage location in the namespace object
960 *
961 * Returns: %0 on success on -errno on error
962 */
963 static int namespace_update_uuid(struct nd_region *nd_region,
964 struct device *dev, uuid_t *new_uuid,
965 uuid_t **old_uuid)
966 {
967 struct nd_label_id old_label_id;
968 struct nd_label_id new_label_id;
969 int i;
970
971 if (!nd_is_uuid_unique(dev, new_uuid))
972 return -EINVAL;
973
974 if (*old_uuid == NULL)
975 goto out;
976
977 /*
978 * If we've already written a label with this uuid, then it's
979 * too late to rename because we can't reliably update the uuid
980 * without losing the old namespace. Userspace must delete this
981 * namespace to abandon the old uuid.
982 */
983 for (i = 0; i < nd_region->ndr_mappings; i++) {
984 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
985
986 /*
987 * This check by itself is sufficient because old_uuid
988 * would be NULL above if this uuid did not exist in the
989 * currently written set.
990 *
991 * FIXME: can we delete uuid with zero dpa allocated?
992 */
993 if (list_empty(&nd_mapping->labels))
994 return -EBUSY;
995 }
996
997 nd_label_gen_id(&old_label_id, *old_uuid, 0);
998 nd_label_gen_id(&new_label_id, new_uuid, 0);
999 for (i = 0; i < nd_region->ndr_mappings; i++) {
1000 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1001 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1002 struct nd_label_ent *label_ent;
1003 struct resource *res;
1004
1005 for_each_dpa_resource(ndd, res)
1006 if (strcmp(res->name, old_label_id.id) == 0)
1007 sprintf((void *) res->name, "%s",
1008 new_label_id.id);
1009
1010 mutex_lock(&nd_mapping->lock);
1011 list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1012 struct nd_namespace_label *nd_label = label_ent->label;
1013 struct nd_label_id label_id;
1014 uuid_t uuid;
1015
1016 if (!nd_label)
1017 continue;
1018 nsl_get_uuid(ndd, nd_label, &uuid);
1019 nd_label_gen_id(&label_id, &uuid,
1020 nsl_get_flags(ndd, nd_label));
1021 if (strcmp(old_label_id.id, label_id.id) == 0)
1022 set_bit(ND_LABEL_REAP, &label_ent->flags);
1023 }
1024 mutex_unlock(&nd_mapping->lock);
1025 }
1026 kfree(*old_uuid);
1027 out:
1028 *old_uuid = new_uuid;
1029 return 0;
1030 }
1031
1032 static ssize_t uuid_store(struct device *dev,
1033 struct device_attribute *attr, const char *buf, size_t len)
1034 {
1035 struct nd_region *nd_region = to_nd_region(dev->parent);
1036 uuid_t *uuid = NULL;
1037 uuid_t **ns_uuid;
1038 ssize_t rc = 0;
1039
1040 if (is_namespace_pmem(dev)) {
1041 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1042
1043 ns_uuid = &nspm->uuid;
1044 } else
1045 return -ENXIO;
1046
1047 device_lock(dev);
1048 nvdimm_bus_lock(dev);
1049 wait_nvdimm_bus_probe_idle(dev);
1050 if (to_ndns(dev)->claim)
1051 rc = -EBUSY;
1052 if (rc >= 0)
1053 rc = nd_uuid_store(dev, &uuid, buf, len);
1054 if (rc >= 0)
1055 rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid);
1056 if (rc >= 0)
1057 rc = nd_namespace_label_update(nd_region, dev);
1058 else
1059 kfree(uuid);
1060 dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
1061 buf[len - 1] == '\n' ? "" : "\n");
1062 nvdimm_bus_unlock(dev);
1063 device_unlock(dev);
1064
1065 return rc < 0 ? rc : len;
1066 }
1067 static DEVICE_ATTR_RW(uuid);
1068
1069 static ssize_t resource_show(struct device *dev,
1070 struct device_attribute *attr, char *buf)
1071 {
1072 struct resource *res;
1073
1074 if (is_namespace_pmem(dev)) {
1075 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1076
1077 res = &nspm->nsio.res;
1078 } else if (is_namespace_io(dev)) {
1079 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
1080
1081 res = &nsio->res;
1082 } else
1083 return -ENXIO;
1084
1085 /* no address to convey if the namespace has no allocation */
1086 if (resource_size(res) == 0)
1087 return -ENXIO;
1088 return sprintf(buf, "%#llx\n", (unsigned long long) res->start);
1089 }
1090 static DEVICE_ATTR_ADMIN_RO(resource);
1091
1092 static const unsigned long pmem_lbasize_supported[] = { 512, 4096, 0 };
1093
1094 static ssize_t sector_size_show(struct device *dev,
1095 struct device_attribute *attr, char *buf)
1096 {
1097 if (is_namespace_pmem(dev)) {
1098 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1099
1100 return nd_size_select_show(nspm->lbasize,
1101 pmem_lbasize_supported, buf);
1102 }
1103 return -ENXIO;
1104 }
1105
1106 static ssize_t sector_size_store(struct device *dev,
1107 struct device_attribute *attr, const char *buf, size_t len)
1108 {
1109 struct nd_region *nd_region = to_nd_region(dev->parent);
1110 const unsigned long *supported;
1111 unsigned long *lbasize;
1112 ssize_t rc = 0;
1113
1114 if (is_namespace_pmem(dev)) {
1115 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1116
1117 lbasize = &nspm->lbasize;
1118 supported = pmem_lbasize_supported;
1119 } else
1120 return -ENXIO;
1121
1122 device_lock(dev);
1123 nvdimm_bus_lock(dev);
1124 if (to_ndns(dev)->claim)
1125 rc = -EBUSY;
1126 if (rc >= 0)
1127 rc = nd_size_select_store(dev, buf, lbasize, supported);
1128 if (rc >= 0)
1129 rc = nd_namespace_label_update(nd_region, dev);
1130 dev_dbg(dev, "result: %zd %s: %s%s", rc, rc < 0 ? "tried" : "wrote",
1131 buf, buf[len - 1] == '\n' ? "" : "\n");
1132 nvdimm_bus_unlock(dev);
1133 device_unlock(dev);
1134
1135 return rc ? rc : len;
1136 }
1137 static DEVICE_ATTR_RW(sector_size);
1138
1139 static ssize_t dpa_extents_show(struct device *dev,
1140 struct device_attribute *attr, char *buf)
1141 {
1142 struct nd_region *nd_region = to_nd_region(dev->parent);
1143 struct nd_label_id label_id;
1144 uuid_t *uuid = NULL;
1145 int count = 0, i;
1146 u32 flags = 0;
1147
1148 nvdimm_bus_lock(dev);
1149 if (is_namespace_pmem(dev)) {
1150 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1151
1152 uuid = nspm->uuid;
1153 flags = 0;
1154 }
1155
1156 if (!uuid)
1157 goto out;
1158
1159 nd_label_gen_id(&label_id, uuid, flags);
1160 for (i = 0; i < nd_region->ndr_mappings; i++) {
1161 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1162 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1163 struct resource *res;
1164
1165 for_each_dpa_resource(ndd, res)
1166 if (strcmp(res->name, label_id.id) == 0)
1167 count++;
1168 }
1169 out:
1170 nvdimm_bus_unlock(dev);
1171
1172 return sprintf(buf, "%d\n", count);
1173 }
1174 static DEVICE_ATTR_RO(dpa_extents);
1175
1176 static int btt_claim_class(struct device *dev)
1177 {
1178 struct nd_region *nd_region = to_nd_region(dev->parent);
1179 int i, loop_bitmask = 0;
1180
1181 for (i = 0; i < nd_region->ndr_mappings; i++) {
1182 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1183 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1184 struct nd_namespace_index *nsindex;
1185
1186 /*
1187 * If any of the DIMMs do not support labels the only
1188 * possible BTT format is v1.
1189 */
1190 if (!ndd) {
1191 loop_bitmask = 0;
1192 break;
1193 }
1194
1195 nsindex = to_namespace_index(ndd, ndd->ns_current);
1196 if (nsindex == NULL)
1197 loop_bitmask |= 1;
1198 else {
1199 /* check whether existing labels are v1.1 or v1.2 */
1200 if (__le16_to_cpu(nsindex->major) == 1
1201 && __le16_to_cpu(nsindex->minor) == 1)
1202 loop_bitmask |= 2;
1203 else
1204 loop_bitmask |= 4;
1205 }
1206 }
1207 /*
1208 * If nsindex is null loop_bitmask's bit 0 will be set, and if an index
1209 * block is found, a v1.1 label for any mapping will set bit 1, and a
1210 * v1.2 label will set bit 2.
1211 *
1212 * At the end of the loop, at most one of the three bits must be set.
1213 * If multiple bits were set, it means the different mappings disagree
1214 * about their labels, and this must be cleaned up first.
1215 *
1216 * If all the label index blocks are found to agree, nsindex of NULL
1217 * implies labels haven't been initialized yet, and when they will,
1218 * they will be of the 1.2 format, so we can assume BTT2.0
1219 *
1220 * If 1.1 labels are found, we enforce BTT1.1, and if 1.2 labels are
1221 * found, we enforce BTT2.0
1222 *
1223 * If the loop was never entered, default to BTT1.1 (legacy namespaces)
1224 */
1225 switch (loop_bitmask) {
1226 case 0:
1227 case 2:
1228 return NVDIMM_CCLASS_BTT;
1229 case 1:
1230 case 4:
1231 return NVDIMM_CCLASS_BTT2;
1232 default:
1233 return -ENXIO;
1234 }
1235 }
1236
1237 static ssize_t holder_show(struct device *dev,
1238 struct device_attribute *attr, char *buf)
1239 {
1240 struct nd_namespace_common *ndns = to_ndns(dev);
1241 ssize_t rc;
1242
1243 device_lock(dev);
1244 rc = sprintf(buf, "%s\n", ndns->claim ? dev_name(ndns->claim) : "");
1245 device_unlock(dev);
1246
1247 return rc;
1248 }
1249 static DEVICE_ATTR_RO(holder);
1250
1251 static int __holder_class_store(struct device *dev, const char *buf)
1252 {
1253 struct nd_namespace_common *ndns = to_ndns(dev);
1254
1255 if (dev->driver || ndns->claim)
1256 return -EBUSY;
1257
1258 if (sysfs_streq(buf, "btt")) {
1259 int rc = btt_claim_class(dev);
1260
1261 if (rc < NVDIMM_CCLASS_NONE)
1262 return rc;
1263 ndns->claim_class = rc;
1264 } else if (sysfs_streq(buf, "pfn"))
1265 ndns->claim_class = NVDIMM_CCLASS_PFN;
1266 else if (sysfs_streq(buf, "dax"))
1267 ndns->claim_class = NVDIMM_CCLASS_DAX;
1268 else if (sysfs_streq(buf, ""))
1269 ndns->claim_class = NVDIMM_CCLASS_NONE;
1270 else
1271 return -EINVAL;
1272
1273 return 0;
1274 }
1275
1276 static ssize_t holder_class_store(struct device *dev,
1277 struct device_attribute *attr, const char *buf, size_t len)
1278 {
1279 struct nd_region *nd_region = to_nd_region(dev->parent);
1280 int rc;
1281
1282 device_lock(dev);
1283 nvdimm_bus_lock(dev);
1284 wait_nvdimm_bus_probe_idle(dev);
1285 rc = __holder_class_store(dev, buf);
1286 if (rc >= 0)
1287 rc = nd_namespace_label_update(nd_region, dev);
1288 dev_dbg(dev, "%s(%d)\n", rc < 0 ? "fail " : "", rc);
1289 nvdimm_bus_unlock(dev);
1290 device_unlock(dev);
1291
1292 return rc < 0 ? rc : len;
1293 }
1294
1295 static ssize_t holder_class_show(struct device *dev,
1296 struct device_attribute *attr, char *buf)
1297 {
1298 struct nd_namespace_common *ndns = to_ndns(dev);
1299 ssize_t rc;
1300
1301 device_lock(dev);
1302 if (ndns->claim_class == NVDIMM_CCLASS_NONE)
1303 rc = sprintf(buf, "\n");
1304 else if ((ndns->claim_class == NVDIMM_CCLASS_BTT) ||
1305 (ndns->claim_class == NVDIMM_CCLASS_BTT2))
1306 rc = sprintf(buf, "btt\n");
1307 else if (ndns->claim_class == NVDIMM_CCLASS_PFN)
1308 rc = sprintf(buf, "pfn\n");
1309 else if (ndns->claim_class == NVDIMM_CCLASS_DAX)
1310 rc = sprintf(buf, "dax\n");
1311 else
1312 rc = sprintf(buf, "<unknown>\n");
1313 device_unlock(dev);
1314
1315 return rc;
1316 }
1317 static DEVICE_ATTR_RW(holder_class);
1318
1319 static ssize_t mode_show(struct device *dev,
1320 struct device_attribute *attr, char *buf)
1321 {
1322 struct nd_namespace_common *ndns = to_ndns(dev);
1323 struct device *claim;
1324 char *mode;
1325 ssize_t rc;
1326
1327 device_lock(dev);
1328 claim = ndns->claim;
1329 if (claim && is_nd_btt(claim))
1330 mode = "safe";
1331 else if (claim && is_nd_pfn(claim))
1332 mode = "memory";
1333 else if (claim && is_nd_dax(claim))
1334 mode = "dax";
1335 else if (!claim && pmem_should_map_pages(dev))
1336 mode = "memory";
1337 else
1338 mode = "raw";
1339 rc = sprintf(buf, "%s\n", mode);
1340 device_unlock(dev);
1341
1342 return rc;
1343 }
1344 static DEVICE_ATTR_RO(mode);
1345
1346 static ssize_t force_raw_store(struct device *dev,
1347 struct device_attribute *attr, const char *buf, size_t len)
1348 {
1349 bool force_raw;
1350 int rc = kstrtobool(buf, &force_raw);
1351
1352 if (rc)
1353 return rc;
1354
1355 to_ndns(dev)->force_raw = force_raw;
1356 return len;
1357 }
1358
1359 static ssize_t force_raw_show(struct device *dev,
1360 struct device_attribute *attr, char *buf)
1361 {
1362 return sprintf(buf, "%d\n", to_ndns(dev)->force_raw);
1363 }
1364 static DEVICE_ATTR_RW(force_raw);
1365
1366 static struct attribute *nd_namespace_attributes[] = {
1367 &dev_attr_nstype.attr,
1368 &dev_attr_size.attr,
1369 &dev_attr_mode.attr,
1370 &dev_attr_uuid.attr,
1371 &dev_attr_holder.attr,
1372 &dev_attr_resource.attr,
1373 &dev_attr_alt_name.attr,
1374 &dev_attr_force_raw.attr,
1375 &dev_attr_sector_size.attr,
1376 &dev_attr_dpa_extents.attr,
1377 &dev_attr_holder_class.attr,
1378 NULL,
1379 };
1380
1381 static umode_t namespace_visible(struct kobject *kobj,
1382 struct attribute *a, int n)
1383 {
1384 struct device *dev = container_of(kobj, struct device, kobj);
1385
1386 if (is_namespace_pmem(dev)) {
1387 if (a == &dev_attr_size.attr)
1388 return 0644;
1389
1390 return a->mode;
1391 }
1392
1393 /* base is_namespace_io() attributes */
1394 if (a == &dev_attr_nstype.attr || a == &dev_attr_size.attr ||
1395 a == &dev_attr_holder.attr || a == &dev_attr_holder_class.attr ||
1396 a == &dev_attr_force_raw.attr || a == &dev_attr_mode.attr ||
1397 a == &dev_attr_resource.attr)
1398 return a->mode;
1399
1400 return 0;
1401 }
1402
1403 static struct attribute_group nd_namespace_attribute_group = {
1404 .attrs = nd_namespace_attributes,
1405 .is_visible = namespace_visible,
1406 };
1407
1408 static const struct attribute_group *nd_namespace_attribute_groups[] = {
1409 &nd_device_attribute_group,
1410 &nd_namespace_attribute_group,
1411 &nd_numa_attribute_group,
1412 NULL,
1413 };
1414
1415 static const struct device_type namespace_io_device_type = {
1416 .name = "nd_namespace_io",
1417 .release = namespace_io_release,
1418 .groups = nd_namespace_attribute_groups,
1419 };
1420
1421 static const struct device_type namespace_pmem_device_type = {
1422 .name = "nd_namespace_pmem",
1423 .release = namespace_pmem_release,
1424 .groups = nd_namespace_attribute_groups,
1425 };
1426
1427 static bool is_namespace_pmem(const struct device *dev)
1428 {
1429 return dev ? dev->type == &namespace_pmem_device_type : false;
1430 }
1431
1432 static bool is_namespace_io(const struct device *dev)
1433 {
1434 return dev ? dev->type == &namespace_io_device_type : false;
1435 }
1436
1437 struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev)
1438 {
1439 struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL;
1440 struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL;
1441 struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL;
1442 struct nd_namespace_common *ndns = NULL;
1443 resource_size_t size;
1444
1445 if (nd_btt || nd_pfn || nd_dax) {
1446 if (nd_btt)
1447 ndns = nd_btt->ndns;
1448 else if (nd_pfn)
1449 ndns = nd_pfn->ndns;
1450 else if (nd_dax)
1451 ndns = nd_dax->nd_pfn.ndns;
1452
1453 if (!ndns)
1454 return ERR_PTR(-ENODEV);
1455
1456 /*
1457 * Flush any in-progess probes / removals in the driver
1458 * for the raw personality of this namespace.
1459 */
1460 device_lock(&ndns->dev);
1461 device_unlock(&ndns->dev);
1462 if (ndns->dev.driver) {
1463 dev_dbg(&ndns->dev, "is active, can't bind %s\n",
1464 dev_name(dev));
1465 return ERR_PTR(-EBUSY);
1466 }
1467 if (dev_WARN_ONCE(&ndns->dev, ndns->claim != dev,
1468 "host (%s) vs claim (%s) mismatch\n",
1469 dev_name(dev),
1470 dev_name(ndns->claim)))
1471 return ERR_PTR(-ENXIO);
1472 } else {
1473 ndns = to_ndns(dev);
1474 if (ndns->claim) {
1475 dev_dbg(dev, "claimed by %s, failing probe\n",
1476 dev_name(ndns->claim));
1477
1478 return ERR_PTR(-ENXIO);
1479 }
1480 }
1481
1482 if (nvdimm_namespace_locked(ndns))
1483 return ERR_PTR(-EACCES);
1484
1485 size = nvdimm_namespace_capacity(ndns);
1486 if (size < ND_MIN_NAMESPACE_SIZE) {
1487 dev_dbg(&ndns->dev, "%pa, too small must be at least %#x\n",
1488 &size, ND_MIN_NAMESPACE_SIZE);
1489 return ERR_PTR(-ENODEV);
1490 }
1491
1492 /*
1493 * Note, alignment validation for fsdax and devdax mode
1494 * namespaces happens in nd_pfn_validate() where infoblock
1495 * padding parameters can be applied.
1496 */
1497 if (pmem_should_map_pages(dev)) {
1498 struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
1499 struct resource *res = &nsio->res;
1500
1501 if (!IS_ALIGNED(res->start | (res->end + 1),
1502 memremap_compat_align())) {
1503 dev_err(&ndns->dev, "%pr misaligned, unable to map\n", res);
1504 return ERR_PTR(-EOPNOTSUPP);
1505 }
1506 }
1507
1508 if (is_namespace_pmem(&ndns->dev)) {
1509 struct nd_namespace_pmem *nspm;
1510
1511 nspm = to_nd_namespace_pmem(&ndns->dev);
1512 if (uuid_not_set(nspm->uuid, &ndns->dev, __func__))
1513 return ERR_PTR(-ENODEV);
1514 }
1515
1516 return ndns;
1517 }
1518 EXPORT_SYMBOL(nvdimm_namespace_common_probe);
1519
1520 int devm_namespace_enable(struct device *dev, struct nd_namespace_common *ndns,
1521 resource_size_t size)
1522 {
1523 return devm_nsio_enable(dev, to_nd_namespace_io(&ndns->dev), size);
1524 }
1525 EXPORT_SYMBOL_GPL(devm_namespace_enable);
1526
1527 void devm_namespace_disable(struct device *dev, struct nd_namespace_common *ndns)
1528 {
1529 devm_nsio_disable(dev, to_nd_namespace_io(&ndns->dev));
1530 }
1531 EXPORT_SYMBOL_GPL(devm_namespace_disable);
1532
1533 static struct device **create_namespace_io(struct nd_region *nd_region)
1534 {
1535 struct nd_namespace_io *nsio;
1536 struct device *dev, **devs;
1537 struct resource *res;
1538
1539 nsio = kzalloc(sizeof(*nsio), GFP_KERNEL);
1540 if (!nsio)
1541 return NULL;
1542
1543 devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL);
1544 if (!devs) {
1545 kfree(nsio);
1546 return NULL;
1547 }
1548
1549 dev = &nsio->common.dev;
1550 dev->type = &namespace_io_device_type;
1551 dev->parent = &nd_region->dev;
1552 res = &nsio->res;
1553 res->name = dev_name(&nd_region->dev);
1554 res->flags = IORESOURCE_MEM;
1555 res->start = nd_region->ndr_start;
1556 res->end = res->start + nd_region->ndr_size - 1;
1557
1558 devs[0] = dev;
1559 return devs;
1560 }
1561
1562 static bool has_uuid_at_pos(struct nd_region *nd_region, const uuid_t *uuid,
1563 u64 cookie, u16 pos)
1564 {
1565 struct nd_namespace_label *found = NULL;
1566 int i;
1567
1568 for (i = 0; i < nd_region->ndr_mappings; i++) {
1569 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1570 struct nd_interleave_set *nd_set = nd_region->nd_set;
1571 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1572 struct nd_label_ent *label_ent;
1573 bool found_uuid = false;
1574
1575 list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1576 struct nd_namespace_label *nd_label = label_ent->label;
1577 u16 position;
1578
1579 if (!nd_label)
1580 continue;
1581 position = nsl_get_position(ndd, nd_label);
1582
1583 if (!nsl_validate_isetcookie(ndd, nd_label, cookie))
1584 continue;
1585
1586 if (!nsl_uuid_equal(ndd, nd_label, uuid))
1587 continue;
1588
1589 if (!nsl_validate_type_guid(ndd, nd_label,
1590 &nd_set->type_guid))
1591 continue;
1592
1593 if (found_uuid) {
1594 dev_dbg(ndd->dev, "duplicate entry for uuid\n");
1595 return false;
1596 }
1597 found_uuid = true;
1598 if (!nsl_validate_nlabel(nd_region, ndd, nd_label))
1599 continue;
1600 if (position != pos)
1601 continue;
1602 found = nd_label;
1603 break;
1604 }
1605 if (found)
1606 break;
1607 }
1608 return found != NULL;
1609 }
1610
1611 static int select_pmem_id(struct nd_region *nd_region, const uuid_t *pmem_id)
1612 {
1613 int i;
1614
1615 for (i = 0; i < nd_region->ndr_mappings; i++) {
1616 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1617 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1618 struct nd_namespace_label *nd_label = NULL;
1619 u64 hw_start, hw_end, pmem_start, pmem_end;
1620 struct nd_label_ent *label_ent;
1621
1622 lockdep_assert_held(&nd_mapping->lock);
1623 list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1624 nd_label = label_ent->label;
1625 if (!nd_label)
1626 continue;
1627 if (nsl_uuid_equal(ndd, nd_label, pmem_id))
1628 break;
1629 nd_label = NULL;
1630 }
1631
1632 if (!nd_label) {
1633 WARN_ON(1);
1634 return -EINVAL;
1635 }
1636
1637 /*
1638 * Check that this label is compliant with the dpa
1639 * range published in NFIT
1640 */
1641 hw_start = nd_mapping->start;
1642 hw_end = hw_start + nd_mapping->size;
1643 pmem_start = nsl_get_dpa(ndd, nd_label);
1644 pmem_end = pmem_start + nsl_get_rawsize(ndd, nd_label);
1645 if (pmem_start >= hw_start && pmem_start < hw_end
1646 && pmem_end <= hw_end && pmem_end > hw_start)
1647 /* pass */;
1648 else {
1649 dev_dbg(&nd_region->dev, "%s invalid label for %pUb\n",
1650 dev_name(ndd->dev),
1651 nsl_uuid_raw(ndd, nd_label));
1652 return -EINVAL;
1653 }
1654
1655 /* move recently validated label to the front of the list */
1656 list_move(&label_ent->list, &nd_mapping->labels);
1657 }
1658 return 0;
1659 }
1660
1661 /**
1662 * create_namespace_pmem - validate interleave set labelling, retrieve label0
1663 * @nd_region: region with mappings to validate
1664 * @nd_mapping: container of dpa-resource-root + labels
1665 * @nd_label: target pmem namespace label to evaluate
1666 *
1667 * Returns: the created &struct device on success or ERR_PTR(-errno) on error
1668 */
1669 static struct device *create_namespace_pmem(struct nd_region *nd_region,
1670 struct nd_mapping *nd_mapping,
1671 struct nd_namespace_label *nd_label)
1672 {
1673 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1674 struct nd_namespace_index *nsindex =
1675 to_namespace_index(ndd, ndd->ns_current);
1676 u64 cookie = nd_region_interleave_set_cookie(nd_region, nsindex);
1677 u64 altcookie = nd_region_interleave_set_altcookie(nd_region);
1678 struct nd_label_ent *label_ent;
1679 struct nd_namespace_pmem *nspm;
1680 resource_size_t size = 0;
1681 struct resource *res;
1682 struct device *dev;
1683 uuid_t uuid;
1684 int rc = 0;
1685 u16 i;
1686
1687 if (cookie == 0) {
1688 dev_dbg(&nd_region->dev, "invalid interleave-set-cookie\n");
1689 return ERR_PTR(-ENXIO);
1690 }
1691
1692 if (!nsl_validate_isetcookie(ndd, nd_label, cookie)) {
1693 dev_dbg(&nd_region->dev, "invalid cookie in label: %pUb\n",
1694 nsl_uuid_raw(ndd, nd_label));
1695 if (!nsl_validate_isetcookie(ndd, nd_label, altcookie))
1696 return ERR_PTR(-EAGAIN);
1697
1698 dev_dbg(&nd_region->dev, "valid altcookie in label: %pUb\n",
1699 nsl_uuid_raw(ndd, nd_label));
1700 }
1701
1702 nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
1703 if (!nspm)
1704 return ERR_PTR(-ENOMEM);
1705
1706 nspm->id = -1;
1707 dev = &nspm->nsio.common.dev;
1708 dev->type = &namespace_pmem_device_type;
1709 dev->parent = &nd_region->dev;
1710 res = &nspm->nsio.res;
1711 res->name = dev_name(&nd_region->dev);
1712 res->flags = IORESOURCE_MEM;
1713
1714 for (i = 0; i < nd_region->ndr_mappings; i++) {
1715 nsl_get_uuid(ndd, nd_label, &uuid);
1716 if (has_uuid_at_pos(nd_region, &uuid, cookie, i))
1717 continue;
1718 if (has_uuid_at_pos(nd_region, &uuid, altcookie, i))
1719 continue;
1720 break;
1721 }
1722
1723 if (i < nd_region->ndr_mappings) {
1724 struct nvdimm *nvdimm = nd_region->mapping[i].nvdimm;
1725
1726 /*
1727 * Give up if we don't find an instance of a uuid at each
1728 * position (from 0 to nd_region->ndr_mappings - 1), or if we
1729 * find a dimm with two instances of the same uuid.
1730 */
1731 dev_err(&nd_region->dev, "%s missing label for %pUb\n",
1732 nvdimm_name(nvdimm), nsl_uuid_raw(ndd, nd_label));
1733 rc = -EINVAL;
1734 goto err;
1735 }
1736
1737 /*
1738 * Fix up each mapping's 'labels' to have the validated pmem label for
1739 * that position at labels[0], and NULL at labels[1]. In the process,
1740 * check that the namespace aligns with interleave-set.
1741 */
1742 nsl_get_uuid(ndd, nd_label, &uuid);
1743 rc = select_pmem_id(nd_region, &uuid);
1744 if (rc)
1745 goto err;
1746
1747 /* Calculate total size and populate namespace properties from label0 */
1748 for (i = 0; i < nd_region->ndr_mappings; i++) {
1749 struct nd_namespace_label *label0;
1750 struct nvdimm_drvdata *ndd;
1751
1752 nd_mapping = &nd_region->mapping[i];
1753 label_ent = list_first_entry_or_null(&nd_mapping->labels,
1754 typeof(*label_ent), list);
1755 label0 = label_ent ? label_ent->label : NULL;
1756
1757 if (!label0) {
1758 WARN_ON(1);
1759 continue;
1760 }
1761
1762 ndd = to_ndd(nd_mapping);
1763 size += nsl_get_rawsize(ndd, label0);
1764 if (nsl_get_position(ndd, label0) != 0)
1765 continue;
1766 WARN_ON(nspm->alt_name || nspm->uuid);
1767 nspm->alt_name = kmemdup(nsl_ref_name(ndd, label0),
1768 NSLABEL_NAME_LEN, GFP_KERNEL);
1769 nsl_get_uuid(ndd, label0, &uuid);
1770 nspm->uuid = kmemdup(&uuid, sizeof(uuid_t), GFP_KERNEL);
1771 nspm->lbasize = nsl_get_lbasize(ndd, label0);
1772 nspm->nsio.common.claim_class =
1773 nsl_get_claim_class(ndd, label0);
1774 }
1775
1776 if (!nspm->alt_name || !nspm->uuid) {
1777 rc = -ENOMEM;
1778 goto err;
1779 }
1780
1781 nd_namespace_pmem_set_resource(nd_region, nspm, size);
1782
1783 return dev;
1784 err:
1785 namespace_pmem_release(dev);
1786 switch (rc) {
1787 case -EINVAL:
1788 dev_dbg(&nd_region->dev, "invalid label(s)\n");
1789 break;
1790 default:
1791 dev_dbg(&nd_region->dev, "unexpected err: %d\n", rc);
1792 break;
1793 }
1794 return ERR_PTR(rc);
1795 }
1796
1797 static struct device *nd_namespace_pmem_create(struct nd_region *nd_region)
1798 {
1799 struct nd_namespace_pmem *nspm;
1800 struct resource *res;
1801 struct device *dev;
1802
1803 if (!is_memory(&nd_region->dev))
1804 return NULL;
1805
1806 nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
1807 if (!nspm)
1808 return NULL;
1809
1810 dev = &nspm->nsio.common.dev;
1811 dev->type = &namespace_pmem_device_type;
1812 dev->parent = &nd_region->dev;
1813 res = &nspm->nsio.res;
1814 res->name = dev_name(&nd_region->dev);
1815 res->flags = IORESOURCE_MEM;
1816
1817 nspm->id = ida_alloc(&nd_region->ns_ida, GFP_KERNEL);
1818 if (nspm->id < 0) {
1819 kfree(nspm);
1820 return NULL;
1821 }
1822 dev_set_name(dev, "namespace%d.%d", nd_region->id, nspm->id);
1823 nd_namespace_pmem_set_resource(nd_region, nspm, 0);
1824
1825 return dev;
1826 }
1827
1828 static struct lock_class_key nvdimm_namespace_key;
1829
1830 void nd_region_create_ns_seed(struct nd_region *nd_region)
1831 {
1832 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
1833
1834 if (nd_region_to_nstype(nd_region) == ND_DEVICE_NAMESPACE_IO)
1835 return;
1836
1837 nd_region->ns_seed = nd_namespace_pmem_create(nd_region);
1838
1839 /*
1840 * Seed creation failures are not fatal, provisioning is simply
1841 * disabled until memory becomes available
1842 */
1843 if (!nd_region->ns_seed)
1844 dev_err(&nd_region->dev, "failed to create namespace\n");
1845 else {
1846 device_initialize(nd_region->ns_seed);
1847 lockdep_set_class(&nd_region->ns_seed->mutex,
1848 &nvdimm_namespace_key);
1849 nd_device_register(nd_region->ns_seed);
1850 }
1851 }
1852
1853 void nd_region_create_dax_seed(struct nd_region *nd_region)
1854 {
1855 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
1856 nd_region->dax_seed = nd_dax_create(nd_region);
1857 /*
1858 * Seed creation failures are not fatal, provisioning is simply
1859 * disabled until memory becomes available
1860 */
1861 if (!nd_region->dax_seed)
1862 dev_err(&nd_region->dev, "failed to create dax namespace\n");
1863 }
1864
1865 void nd_region_create_pfn_seed(struct nd_region *nd_region)
1866 {
1867 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
1868 nd_region->pfn_seed = nd_pfn_create(nd_region);
1869 /*
1870 * Seed creation failures are not fatal, provisioning is simply
1871 * disabled until memory becomes available
1872 */
1873 if (!nd_region->pfn_seed)
1874 dev_err(&nd_region->dev, "failed to create pfn namespace\n");
1875 }
1876
1877 void nd_region_create_btt_seed(struct nd_region *nd_region)
1878 {
1879 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
1880 nd_region->btt_seed = nd_btt_create(nd_region);
1881 /*
1882 * Seed creation failures are not fatal, provisioning is simply
1883 * disabled until memory becomes available
1884 */
1885 if (!nd_region->btt_seed)
1886 dev_err(&nd_region->dev, "failed to create btt namespace\n");
1887 }
1888
1889 static int add_namespace_resource(struct nd_region *nd_region,
1890 struct nd_namespace_label *nd_label, struct device **devs,
1891 int count)
1892 {
1893 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
1894 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1895 int i;
1896
1897 for (i = 0; i < count; i++) {
1898 uuid_t *uuid = namespace_to_uuid(devs[i]);
1899
1900 if (IS_ERR(uuid)) {
1901 WARN_ON(1);
1902 continue;
1903 }
1904
1905 if (!nsl_uuid_equal(ndd, nd_label, uuid))
1906 continue;
1907 dev_err(&nd_region->dev,
1908 "error: conflicting extents for uuid: %pUb\n", uuid);
1909 return -ENXIO;
1910 }
1911
1912 return i;
1913 }
1914
1915 static int cmp_dpa(const void *a, const void *b)
1916 {
1917 const struct device *dev_a = *(const struct device **) a;
1918 const struct device *dev_b = *(const struct device **) b;
1919 struct nd_namespace_pmem *nspm_a, *nspm_b;
1920
1921 if (is_namespace_io(dev_a))
1922 return 0;
1923
1924 nspm_a = to_nd_namespace_pmem(dev_a);
1925 nspm_b = to_nd_namespace_pmem(dev_b);
1926
1927 return memcmp(&nspm_a->nsio.res.start, &nspm_b->nsio.res.start,
1928 sizeof(resource_size_t));
1929 }
1930
1931 static struct device **scan_labels(struct nd_region *nd_region)
1932 {
1933 int i, count = 0;
1934 struct device *dev, **devs;
1935 struct nd_label_ent *label_ent, *e;
1936 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
1937 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1938 resource_size_t map_end = nd_mapping->start + nd_mapping->size - 1;
1939
1940 devs = kcalloc(2, sizeof(dev), GFP_KERNEL);
1941 if (!devs)
1942 return NULL;
1943
1944 /* "safe" because create_namespace_pmem() might list_move() label_ent */
1945 list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
1946 struct nd_namespace_label *nd_label = label_ent->label;
1947 struct device **__devs;
1948
1949 if (!nd_label)
1950 continue;
1951
1952 /* skip labels that describe extents outside of the region */
1953 if (nsl_get_dpa(ndd, nd_label) < nd_mapping->start ||
1954 nsl_get_dpa(ndd, nd_label) > map_end)
1955 continue;
1956
1957 i = add_namespace_resource(nd_region, nd_label, devs, count);
1958 if (i < 0)
1959 goto err;
1960 if (i < count)
1961 continue;
1962 if (count) {
1963 __devs = kcalloc(count + 2, sizeof(dev), GFP_KERNEL);
1964 if (!__devs)
1965 goto err;
1966 memcpy(__devs, devs, sizeof(dev) * count);
1967 kfree(devs);
1968 devs = __devs;
1969 }
1970
1971 dev = create_namespace_pmem(nd_region, nd_mapping, nd_label);
1972 if (IS_ERR(dev)) {
1973 switch (PTR_ERR(dev)) {
1974 case -EAGAIN:
1975 /* skip invalid labels */
1976 continue;
1977 default:
1978 goto err;
1979 }
1980 } else
1981 devs[count++] = dev;
1982
1983 }
1984
1985 dev_dbg(&nd_region->dev, "discovered %d namespace%s\n", count,
1986 count == 1 ? "" : "s");
1987
1988 if (count == 0) {
1989 struct nd_namespace_pmem *nspm;
1990
1991 /* Publish a zero-sized namespace for userspace to configure. */
1992 nd_mapping_free_labels(nd_mapping);
1993 nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
1994 if (!nspm)
1995 goto err;
1996 dev = &nspm->nsio.common.dev;
1997 dev->type = &namespace_pmem_device_type;
1998 nd_namespace_pmem_set_resource(nd_region, nspm, 0);
1999 dev->parent = &nd_region->dev;
2000 devs[count++] = dev;
2001 } else if (is_memory(&nd_region->dev)) {
2002 /* clean unselected labels */
2003 for (i = 0; i < nd_region->ndr_mappings; i++) {
2004 struct list_head *l, *e;
2005 LIST_HEAD(list);
2006 int j;
2007
2008 nd_mapping = &nd_region->mapping[i];
2009 if (list_empty(&nd_mapping->labels)) {
2010 WARN_ON(1);
2011 continue;
2012 }
2013
2014 j = count;
2015 list_for_each_safe(l, e, &nd_mapping->labels) {
2016 if (!j--)
2017 break;
2018 list_move_tail(l, &list);
2019 }
2020 nd_mapping_free_labels(nd_mapping);
2021 list_splice_init(&list, &nd_mapping->labels);
2022 }
2023 }
2024
2025 if (count > 1)
2026 sort(devs, count, sizeof(struct device *), cmp_dpa, NULL);
2027
2028 return devs;
2029
2030 err:
2031 for (i = 0; devs[i]; i++)
2032 namespace_pmem_release(devs[i]);
2033 kfree(devs);
2034
2035 return NULL;
2036 }
2037
2038 static struct device **create_namespaces(struct nd_region *nd_region)
2039 {
2040 struct nd_mapping *nd_mapping;
2041 struct device **devs;
2042 int i;
2043
2044 if (nd_region->ndr_mappings == 0)
2045 return NULL;
2046
2047 /* lock down all mappings while we scan labels */
2048 for (i = 0; i < nd_region->ndr_mappings; i++) {
2049 nd_mapping = &nd_region->mapping[i];
2050 mutex_lock_nested(&nd_mapping->lock, i);
2051 }
2052
2053 devs = scan_labels(nd_region);
2054
2055 for (i = 0; i < nd_region->ndr_mappings; i++) {
2056 int reverse = nd_region->ndr_mappings - 1 - i;
2057
2058 nd_mapping = &nd_region->mapping[reverse];
2059 mutex_unlock(&nd_mapping->lock);
2060 }
2061
2062 return devs;
2063 }
2064
2065 static void deactivate_labels(void *region)
2066 {
2067 struct nd_region *nd_region = region;
2068 int i;
2069
2070 for (i = 0; i < nd_region->ndr_mappings; i++) {
2071 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
2072 struct nvdimm_drvdata *ndd = nd_mapping->ndd;
2073 struct nvdimm *nvdimm = nd_mapping->nvdimm;
2074
2075 mutex_lock(&nd_mapping->lock);
2076 nd_mapping_free_labels(nd_mapping);
2077 mutex_unlock(&nd_mapping->lock);
2078
2079 put_ndd(ndd);
2080 nd_mapping->ndd = NULL;
2081 if (ndd)
2082 atomic_dec(&nvdimm->busy);
2083 }
2084 }
2085
2086 static int init_active_labels(struct nd_region *nd_region)
2087 {
2088 int i, rc = 0;
2089
2090 for (i = 0; i < nd_region->ndr_mappings; i++) {
2091 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
2092 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2093 struct nvdimm *nvdimm = nd_mapping->nvdimm;
2094 struct nd_label_ent *label_ent;
2095 int count, j;
2096
2097 /*
2098 * If the dimm is disabled then we may need to prevent
2099 * the region from being activated.
2100 */
2101 if (!ndd) {
2102 if (test_bit(NDD_LOCKED, &nvdimm->flags))
2103 /* fail, label data may be unreadable */;
2104 else if (test_bit(NDD_LABELING, &nvdimm->flags))
2105 /* fail, labels needed to disambiguate dpa */;
2106 else
2107 continue;
2108
2109 dev_err(&nd_region->dev, "%s: is %s, failing probe\n",
2110 dev_name(&nd_mapping->nvdimm->dev),
2111 test_bit(NDD_LOCKED, &nvdimm->flags)
2112 ? "locked" : "disabled");
2113 rc = -ENXIO;
2114 goto out;
2115 }
2116 nd_mapping->ndd = ndd;
2117 atomic_inc(&nvdimm->busy);
2118 get_ndd(ndd);
2119
2120 count = nd_label_active_count(ndd);
2121 dev_dbg(ndd->dev, "count: %d\n", count);
2122 if (!count)
2123 continue;
2124 for (j = 0; j < count; j++) {
2125 struct nd_namespace_label *label;
2126
2127 label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL);
2128 if (!label_ent)
2129 break;
2130 label = nd_label_active(ndd, j);
2131 label_ent->label = label;
2132
2133 mutex_lock(&nd_mapping->lock);
2134 list_add_tail(&label_ent->list, &nd_mapping->labels);
2135 mutex_unlock(&nd_mapping->lock);
2136 }
2137
2138 if (j < count)
2139 break;
2140 }
2141
2142 if (i < nd_region->ndr_mappings)
2143 rc = -ENOMEM;
2144
2145 out:
2146 if (rc) {
2147 deactivate_labels(nd_region);
2148 return rc;
2149 }
2150
2151 return devm_add_action_or_reset(&nd_region->dev, deactivate_labels,
2152 nd_region);
2153 }
2154
2155 int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
2156 {
2157 struct device **devs = NULL;
2158 int i, rc = 0, type;
2159
2160 *err = 0;
2161 nvdimm_bus_lock(&nd_region->dev);
2162 rc = init_active_labels(nd_region);
2163 if (rc) {
2164 nvdimm_bus_unlock(&nd_region->dev);
2165 return rc;
2166 }
2167
2168 type = nd_region_to_nstype(nd_region);
2169 switch (type) {
2170 case ND_DEVICE_NAMESPACE_IO:
2171 devs = create_namespace_io(nd_region);
2172 break;
2173 case ND_DEVICE_NAMESPACE_PMEM:
2174 devs = create_namespaces(nd_region);
2175 break;
2176 default:
2177 break;
2178 }
2179 nvdimm_bus_unlock(&nd_region->dev);
2180
2181 if (!devs)
2182 return -ENODEV;
2183
2184 for (i = 0; devs[i]; i++) {
2185 struct device *dev = devs[i];
2186 int id;
2187
2188 if (type == ND_DEVICE_NAMESPACE_PMEM) {
2189 struct nd_namespace_pmem *nspm;
2190
2191 nspm = to_nd_namespace_pmem(dev);
2192 id = ida_alloc(&nd_region->ns_ida, GFP_KERNEL);
2193 nspm->id = id;
2194 } else
2195 id = i;
2196
2197 if (id < 0)
2198 break;
2199 dev_set_name(dev, "namespace%d.%d", nd_region->id, id);
2200 device_initialize(dev);
2201 lockdep_set_class(&dev->mutex, &nvdimm_namespace_key);
2202 nd_device_register(dev);
2203 }
2204 if (i)
2205 nd_region->ns_seed = devs[0];
2206
2207 if (devs[i]) {
2208 int j;
2209
2210 for (j = i; devs[j]; j++) {
2211 struct device *dev = devs[j];
2212
2213 device_initialize(dev);
2214 put_device(dev);
2215 }
2216 *err = j - i;
2217 /*
2218 * All of the namespaces we tried to register failed, so
2219 * fail region activation.
2220 */
2221 if (*err == 0)
2222 rc = -ENODEV;
2223 }
2224 kfree(devs);
2225
2226 if (rc == -ENODEV)
2227 return rc;
2228
2229 return i;
2230 }
Kernel DRM miscellaneous fixes and cross-tree changes