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Linux 4.14.13
[linux-stable.git] / drivers / nvdimm / namespace_devs.c
blob0af988739a06c1195b1335ab29f54d9b9752c591
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 */
13 #include <linux/module.h>
14 #include <linux/device.h>
15 #include <linux/sort.h>
16 #include <linux/slab.h>
17 #include <linux/list.h>
18 #include <linux/nd.h>
19 #include "nd-core.h"
20 #include "pmem.h"
21 #include "nd.h"
22
23 static void namespace_io_release(struct device *dev)
24 {
25 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
26
27 kfree(nsio);
28 }
29
30 static void namespace_pmem_release(struct device *dev)
31 {
32 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
33 struct nd_region *nd_region = to_nd_region(dev->parent);
34
35 if (nspm->id >= 0)
36 ida_simple_remove(&nd_region->ns_ida, nspm->id);
37 kfree(nspm->alt_name);
38 kfree(nspm->uuid);
39 kfree(nspm);
40 }
41
42 static void namespace_blk_release(struct device *dev)
43 {
44 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
45 struct nd_region *nd_region = to_nd_region(dev->parent);
46
47 if (nsblk->id >= 0)
48 ida_simple_remove(&nd_region->ns_ida, nsblk->id);
49 kfree(nsblk->alt_name);
50 kfree(nsblk->uuid);
51 kfree(nsblk->res);
52 kfree(nsblk);
53 }
54
55 static const struct device_type namespace_io_device_type = {
56 .name = "nd_namespace_io",
57 .release = namespace_io_release,
58 };
59
60 static const struct device_type namespace_pmem_device_type = {
61 .name = "nd_namespace_pmem",
62 .release = namespace_pmem_release,
63 };
64
65 static const struct device_type namespace_blk_device_type = {
66 .name = "nd_namespace_blk",
67 .release = namespace_blk_release,
68 };
69
70 static bool is_namespace_pmem(const struct device *dev)
71 {
72 return dev ? dev->type == &namespace_pmem_device_type : false;
73 }
74
75 static bool is_namespace_blk(const struct device *dev)
76 {
77 return dev ? dev->type == &namespace_blk_device_type : false;
78 }
79
80 static bool is_namespace_io(const struct device *dev)
81 {
82 return dev ? dev->type == &namespace_io_device_type : false;
83 }
84
85 static int is_uuid_busy(struct device *dev, void *data)
86 {
87 u8 *uuid1 = data, *uuid2 = NULL;
88
89 if (is_namespace_pmem(dev)) {
90 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
91
92 uuid2 = nspm->uuid;
93 } else if (is_namespace_blk(dev)) {
94 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
95
96 uuid2 = nsblk->uuid;
97 } else if (is_nd_btt(dev)) {
98 struct nd_btt *nd_btt = to_nd_btt(dev);
99
100 uuid2 = nd_btt->uuid;
101 } else if (is_nd_pfn(dev)) {
102 struct nd_pfn *nd_pfn = to_nd_pfn(dev);
103
104 uuid2 = nd_pfn->uuid;
105 }
106
107 if (uuid2 && memcmp(uuid1, uuid2, NSLABEL_UUID_LEN) == 0)
108 return -EBUSY;
109
110 return 0;
111 }
112
113 static int is_namespace_uuid_busy(struct device *dev, void *data)
114 {
115 if (is_nd_region(dev))
116 return device_for_each_child(dev, data, is_uuid_busy);
117 return 0;
118 }
119
120 /**
121 * nd_is_uuid_unique - verify that no other namespace has @uuid
122 * @dev: any device on a nvdimm_bus
123 * @uuid: uuid to check
124 */
125 bool nd_is_uuid_unique(struct device *dev, u8 *uuid)
126 {
127 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
128
129 if (!nvdimm_bus)
130 return false;
131 WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm_bus->dev));
132 if (device_for_each_child(&nvdimm_bus->dev, uuid,
133 is_namespace_uuid_busy) != 0)
134 return false;
135 return true;
136 }
137
138 bool pmem_should_map_pages(struct device *dev)
139 {
140 struct nd_region *nd_region = to_nd_region(dev->parent);
141 struct nd_namespace_io *nsio;
142
143 if (!IS_ENABLED(CONFIG_ZONE_DEVICE))
144 return false;
145
146 if (!test_bit(ND_REGION_PAGEMAP, &nd_region->flags))
147 return false;
148
149 if (is_nd_pfn(dev) || is_nd_btt(dev))
150 return false;
151
152 nsio = to_nd_namespace_io(dev);
153 if (region_intersects(nsio->res.start, resource_size(&nsio->res),
154 IORESOURCE_SYSTEM_RAM,
155 IORES_DESC_NONE) == REGION_MIXED)
156 return false;
157
158 return ARCH_MEMREMAP_PMEM == MEMREMAP_WB;
159 }
160 EXPORT_SYMBOL(pmem_should_map_pages);
161
162 unsigned int pmem_sector_size(struct nd_namespace_common *ndns)
163 {
164 if (is_namespace_pmem(&ndns->dev)) {
165 struct nd_namespace_pmem *nspm;
166
167 nspm = to_nd_namespace_pmem(&ndns->dev);
168 if (nspm->lbasize == 0 || nspm->lbasize == 512)
169 /* default */;
170 else if (nspm->lbasize == 4096)
171 return 4096;
172 else
173 dev_WARN(&ndns->dev, "unsupported sector size: %ld\n",
174 nspm->lbasize);
175 }
176
177 /*
178 * There is no namespace label (is_namespace_io()), or the label
179 * indicates the default sector size.
180 */
181 return 512;
182 }
183 EXPORT_SYMBOL(pmem_sector_size);
184
185 const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
186 char *name)
187 {
188 struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
189 const char *suffix = NULL;
190
191 if (ndns->claim && is_nd_btt(ndns->claim))
192 suffix = "s";
193
194 if (is_namespace_pmem(&ndns->dev) || is_namespace_io(&ndns->dev)) {
195 int nsidx = 0;
196
197 if (is_namespace_pmem(&ndns->dev)) {
198 struct nd_namespace_pmem *nspm;
199
200 nspm = to_nd_namespace_pmem(&ndns->dev);
201 nsidx = nspm->id;
202 }
203
204 if (nsidx)
205 sprintf(name, "pmem%d.%d%s", nd_region->id, nsidx,
206 suffix ? suffix : "");
207 else
208 sprintf(name, "pmem%d%s", nd_region->id,
209 suffix ? suffix : "");
210 } else if (is_namespace_blk(&ndns->dev)) {
211 struct nd_namespace_blk *nsblk;
212
213 nsblk = to_nd_namespace_blk(&ndns->dev);
214 sprintf(name, "ndblk%d.%d%s", nd_region->id, nsblk->id,
215 suffix ? suffix : "");
216 } else {
217 return NULL;
218 }
219
220 return name;
221 }
222 EXPORT_SYMBOL(nvdimm_namespace_disk_name);
223
224 const u8 *nd_dev_to_uuid(struct device *dev)
225 {
226 static const u8 null_uuid[16];
227
228 if (!dev)
229 return null_uuid;
230
231 if (is_namespace_pmem(dev)) {
232 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
233
234 return nspm->uuid;
235 } else if (is_namespace_blk(dev)) {
236 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
237
238 return nsblk->uuid;
239 } else
240 return null_uuid;
241 }
242 EXPORT_SYMBOL(nd_dev_to_uuid);
243
244 static ssize_t nstype_show(struct device *dev,
245 struct device_attribute *attr, char *buf)
246 {
247 struct nd_region *nd_region = to_nd_region(dev->parent);
248
249 return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region));
250 }
251 static DEVICE_ATTR_RO(nstype);
252
253 static ssize_t __alt_name_store(struct device *dev, const char *buf,
254 const size_t len)
255 {
256 char *input, *pos, *alt_name, **ns_altname;
257 ssize_t rc;
258
259 if (is_namespace_pmem(dev)) {
260 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
261
262 ns_altname = &nspm->alt_name;
263 } else if (is_namespace_blk(dev)) {
264 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
265
266 ns_altname = &nsblk->alt_name;
267 } else
268 return -ENXIO;
269
270 if (dev->driver || to_ndns(dev)->claim)
271 return -EBUSY;
272
273 input = kmemdup(buf, len + 1, GFP_KERNEL);
274 if (!input)
275 return -ENOMEM;
276
277 input[len] = '\0';
278 pos = strim(input);
279 if (strlen(pos) + 1 > NSLABEL_NAME_LEN) {
280 rc = -EINVAL;
281 goto out;
282 }
283
284 alt_name = kzalloc(NSLABEL_NAME_LEN, GFP_KERNEL);
285 if (!alt_name) {
286 rc = -ENOMEM;
287 goto out;
288 }
289 kfree(*ns_altname);
290 *ns_altname = alt_name;
291 sprintf(*ns_altname, "%s", pos);
292 rc = len;
293
294 out:
295 kfree(input);
296 return rc;
297 }
298
299 static resource_size_t nd_namespace_blk_size(struct nd_namespace_blk *nsblk)
300 {
301 struct nd_region *nd_region = to_nd_region(nsblk->common.dev.parent);
302 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
303 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
304 struct nd_label_id label_id;
305 resource_size_t size = 0;
306 struct resource *res;
307
308 if (!nsblk->uuid)
309 return 0;
310 nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
311 for_each_dpa_resource(ndd, res)
312 if (strcmp(res->name, label_id.id) == 0)
313 size += resource_size(res);
314 return size;
315 }
316
317 static bool __nd_namespace_blk_validate(struct nd_namespace_blk *nsblk)
318 {
319 struct nd_region *nd_region = to_nd_region(nsblk->common.dev.parent);
320 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
321 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
322 struct nd_label_id label_id;
323 struct resource *res;
324 int count, i;
325
326 if (!nsblk->uuid || !nsblk->lbasize || !ndd)
327 return false;
328
329 count = 0;
330 nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
331 for_each_dpa_resource(ndd, res) {
332 if (strcmp(res->name, label_id.id) != 0)
333 continue;
334 /*
335 * Resources with unacknowledged adjustments indicate a
336 * failure to update labels
337 */
338 if (res->flags & DPA_RESOURCE_ADJUSTED)
339 return false;
340 count++;
341 }
342
343 /* These values match after a successful label update */
344 if (count != nsblk->num_resources)
345 return false;
346
347 for (i = 0; i < nsblk->num_resources; i++) {
348 struct resource *found = NULL;
349
350 for_each_dpa_resource(ndd, res)
351 if (res == nsblk->res[i]) {
352 found = res;
353 break;
354 }
355 /* stale resource */
356 if (!found)
357 return false;
358 }
359
360 return true;
361 }
362
363 resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk)
364 {
365 resource_size_t size;
366
367 nvdimm_bus_lock(&nsblk->common.dev);
368 size = __nd_namespace_blk_validate(nsblk);
369 nvdimm_bus_unlock(&nsblk->common.dev);
370
371 return size;
372 }
373 EXPORT_SYMBOL(nd_namespace_blk_validate);
374
375
376 static int nd_namespace_label_update(struct nd_region *nd_region,
377 struct device *dev)
378 {
379 dev_WARN_ONCE(dev, dev->driver || to_ndns(dev)->claim,
380 "namespace must be idle during label update\n");
381 if (dev->driver || to_ndns(dev)->claim)
382 return 0;
383
384 /*
385 * Only allow label writes that will result in a valid namespace
386 * or deletion of an existing namespace.
387 */
388 if (is_namespace_pmem(dev)) {
389 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
390 resource_size_t size = resource_size(&nspm->nsio.res);
391
392 if (size == 0 && nspm->uuid)
393 /* delete allocation */;
394 else if (!nspm->uuid)
395 return 0;
396
397 return nd_pmem_namespace_label_update(nd_region, nspm, size);
398 } else if (is_namespace_blk(dev)) {
399 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
400 resource_size_t size = nd_namespace_blk_size(nsblk);
401
402 if (size == 0 && nsblk->uuid)
403 /* delete allocation */;
404 else if (!nsblk->uuid || !nsblk->lbasize)
405 return 0;
406
407 return nd_blk_namespace_label_update(nd_region, nsblk, size);
408 } else
409 return -ENXIO;
410 }
411
412 static ssize_t alt_name_store(struct device *dev,
413 struct device_attribute *attr, const char *buf, size_t len)
414 {
415 struct nd_region *nd_region = to_nd_region(dev->parent);
416 ssize_t rc;
417
418 device_lock(dev);
419 nvdimm_bus_lock(dev);
420 wait_nvdimm_bus_probe_idle(dev);
421 rc = __alt_name_store(dev, buf, len);
422 if (rc >= 0)
423 rc = nd_namespace_label_update(nd_region, dev);
424 dev_dbg(dev, "%s: %s(%zd)\n", __func__, rc < 0 ? "fail " : "", rc);
425 nvdimm_bus_unlock(dev);
426 device_unlock(dev);
427
428 return rc < 0 ? rc : len;
429 }
430
431 static ssize_t alt_name_show(struct device *dev,
432 struct device_attribute *attr, char *buf)
433 {
434 char *ns_altname;
435
436 if (is_namespace_pmem(dev)) {
437 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
438
439 ns_altname = nspm->alt_name;
440 } else if (is_namespace_blk(dev)) {
441 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
442
443 ns_altname = nsblk->alt_name;
444 } else
445 return -ENXIO;
446
447 return sprintf(buf, "%s\n", ns_altname ? ns_altname : "");
448 }
449 static DEVICE_ATTR_RW(alt_name);
450
451 static int scan_free(struct nd_region *nd_region,
452 struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
453 resource_size_t n)
454 {
455 bool is_blk = strncmp(label_id->id, "blk", 3) == 0;
456 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
457 int rc = 0;
458
459 while (n) {
460 struct resource *res, *last;
461 resource_size_t new_start;
462
463 last = NULL;
464 for_each_dpa_resource(ndd, res)
465 if (strcmp(res->name, label_id->id) == 0)
466 last = res;
467 res = last;
468 if (!res)
469 return 0;
470
471 if (n >= resource_size(res)) {
472 n -= resource_size(res);
473 nd_dbg_dpa(nd_region, ndd, res, "delete %d\n", rc);
474 nvdimm_free_dpa(ndd, res);
475 /* retry with last resource deleted */
476 continue;
477 }
478
479 /*
480 * Keep BLK allocations relegated to high DPA as much as
481 * possible
482 */
483 if (is_blk)
484 new_start = res->start + n;
485 else
486 new_start = res->start;
487
488 rc = adjust_resource(res, new_start, resource_size(res) - n);
489 if (rc == 0)
490 res->flags |= DPA_RESOURCE_ADJUSTED;
491 nd_dbg_dpa(nd_region, ndd, res, "shrink %d\n", rc);
492 break;
493 }
494
495 return rc;
496 }
497
498 /**
499 * shrink_dpa_allocation - for each dimm in region free n bytes for label_id
500 * @nd_region: the set of dimms to reclaim @n bytes from
501 * @label_id: unique identifier for the namespace consuming this dpa range
502 * @n: number of bytes per-dimm to release
503 *
504 * Assumes resources are ordered. Starting from the end try to
505 * adjust_resource() the allocation to @n, but if @n is larger than the
506 * allocation delete it and find the 'new' last allocation in the label
507 * set.
508 */
509 static int shrink_dpa_allocation(struct nd_region *nd_region,
510 struct nd_label_id *label_id, resource_size_t n)
511 {
512 int i;
513
514 for (i = 0; i < nd_region->ndr_mappings; i++) {
515 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
516 int rc;
517
518 rc = scan_free(nd_region, nd_mapping, label_id, n);
519 if (rc)
520 return rc;
521 }
522
523 return 0;
524 }
525
526 static resource_size_t init_dpa_allocation(struct nd_label_id *label_id,
527 struct nd_region *nd_region, struct nd_mapping *nd_mapping,
528 resource_size_t n)
529 {
530 bool is_blk = strncmp(label_id->id, "blk", 3) == 0;
531 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
532 resource_size_t first_dpa;
533 struct resource *res;
534 int rc = 0;
535
536 /* allocate blk from highest dpa first */
537 if (is_blk)
538 first_dpa = nd_mapping->start + nd_mapping->size - n;
539 else
540 first_dpa = nd_mapping->start;
541
542 /* first resource allocation for this label-id or dimm */
543 res = nvdimm_allocate_dpa(ndd, label_id, first_dpa, n);
544 if (!res)
545 rc = -EBUSY;
546
547 nd_dbg_dpa(nd_region, ndd, res, "init %d\n", rc);
548 return rc ? n : 0;
549 }
550
551
552 /**
553 * space_valid() - validate free dpa space against constraints
554 * @nd_region: hosting region of the free space
555 * @ndd: dimm device data for debug
556 * @label_id: namespace id to allocate space
557 * @prev: potential allocation that precedes free space
558 * @next: allocation that follows the given free space range
559 * @exist: first allocation with same id in the mapping
560 * @n: range that must satisfied for pmem allocations
561 * @valid: free space range to validate
562 *
563 * BLK-space is valid as long as it does not precede a PMEM
564 * allocation in a given region. PMEM-space must be contiguous
565 * and adjacent to an existing existing allocation (if one
566 * exists). If reserving PMEM any space is valid.
567 */
568 static void space_valid(struct nd_region *nd_region, struct nvdimm_drvdata *ndd,
569 struct nd_label_id *label_id, struct resource *prev,
570 struct resource *next, struct resource *exist,
571 resource_size_t n, struct resource *valid)
572 {
573 bool is_reserve = strcmp(label_id->id, "pmem-reserve") == 0;
574 bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
575
576 if (valid->start >= valid->end)
577 goto invalid;
578
579 if (is_reserve)
580 return;
581
582 if (!is_pmem) {
583 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
584 struct nvdimm_bus *nvdimm_bus;
585 struct blk_alloc_info info = {
586 .nd_mapping = nd_mapping,
587 .available = nd_mapping->size,
588 .res = valid,
589 };
590
591 WARN_ON(!is_nd_blk(&nd_region->dev));
592 nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
593 device_for_each_child(&nvdimm_bus->dev, &info, alias_dpa_busy);
594 return;
595 }
596
597 /* allocation needs to be contiguous, so this is all or nothing */
598 if (resource_size(valid) < n)
599 goto invalid;
600
601 /* we've got all the space we need and no existing allocation */
602 if (!exist)
603 return;
604
605 /* allocation needs to be contiguous with the existing namespace */
606 if (valid->start == exist->end + 1
607 || valid->end == exist->start - 1)
608 return;
609
610 invalid:
611 /* truncate @valid size to 0 */
612 valid->end = valid->start - 1;
613 }
614
615 enum alloc_loc {
616 ALLOC_ERR = 0, ALLOC_BEFORE, ALLOC_MID, ALLOC_AFTER,
617 };
618
619 static resource_size_t scan_allocate(struct nd_region *nd_region,
620 struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
621 resource_size_t n)
622 {
623 resource_size_t mapping_end = nd_mapping->start + nd_mapping->size - 1;
624 bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
625 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
626 struct resource *res, *exist = NULL, valid;
627 const resource_size_t to_allocate = n;
628 int first;
629
630 for_each_dpa_resource(ndd, res)
631 if (strcmp(label_id->id, res->name) == 0)
632 exist = res;
633
634 valid.start = nd_mapping->start;
635 valid.end = mapping_end;
636 valid.name = "free space";
637 retry:
638 first = 0;
639 for_each_dpa_resource(ndd, res) {
640 struct resource *next = res->sibling, *new_res = NULL;
641 resource_size_t allocate, available = 0;
642 enum alloc_loc loc = ALLOC_ERR;
643 const char *action;
644 int rc = 0;
645
646 /* ignore resources outside this nd_mapping */
647 if (res->start > mapping_end)
648 continue;
649 if (res->end < nd_mapping->start)
650 continue;
651
652 /* space at the beginning of the mapping */
653 if (!first++ && res->start > nd_mapping->start) {
654 valid.start = nd_mapping->start;
655 valid.end = res->start - 1;
656 space_valid(nd_region, ndd, label_id, NULL, next, exist,
657 to_allocate, &valid);
658 available = resource_size(&valid);
659 if (available)
660 loc = ALLOC_BEFORE;
661 }
662
663 /* space between allocations */
664 if (!loc && next) {
665 valid.start = res->start + resource_size(res);
666 valid.end = min(mapping_end, next->start - 1);
667 space_valid(nd_region, ndd, label_id, res, next, exist,
668 to_allocate, &valid);
669 available = resource_size(&valid);
670 if (available)
671 loc = ALLOC_MID;
672 }
673
674 /* space at the end of the mapping */
675 if (!loc && !next) {
676 valid.start = res->start + resource_size(res);
677 valid.end = mapping_end;
678 space_valid(nd_region, ndd, label_id, res, next, exist,
679 to_allocate, &valid);
680 available = resource_size(&valid);
681 if (available)
682 loc = ALLOC_AFTER;
683 }
684
685 if (!loc || !available)
686 continue;
687 allocate = min(available, n);
688 switch (loc) {
689 case ALLOC_BEFORE:
690 if (strcmp(res->name, label_id->id) == 0) {
691 /* adjust current resource up */
692 rc = adjust_resource(res, res->start - allocate,
693 resource_size(res) + allocate);
694 action = "cur grow up";
695 } else
696 action = "allocate";
697 break;
698 case ALLOC_MID:
699 if (strcmp(next->name, label_id->id) == 0) {
700 /* adjust next resource up */
701 rc = adjust_resource(next, next->start
702 - allocate, resource_size(next)
703 + allocate);
704 new_res = next;
705 action = "next grow up";
706 } else if (strcmp(res->name, label_id->id) == 0) {
707 action = "grow down";
708 } else
709 action = "allocate";
710 break;
711 case ALLOC_AFTER:
712 if (strcmp(res->name, label_id->id) == 0)
713 action = "grow down";
714 else
715 action = "allocate";
716 break;
717 default:
718 return n;
719 }
720
721 if (strcmp(action, "allocate") == 0) {
722 /* BLK allocate bottom up */
723 if (!is_pmem)
724 valid.start += available - allocate;
725
726 new_res = nvdimm_allocate_dpa(ndd, label_id,
727 valid.start, allocate);
728 if (!new_res)
729 rc = -EBUSY;
730 } else if (strcmp(action, "grow down") == 0) {
731 /* adjust current resource down */
732 rc = adjust_resource(res, res->start, resource_size(res)
733 + allocate);
734 if (rc == 0)
735 res->flags |= DPA_RESOURCE_ADJUSTED;
736 }
737
738 if (!new_res)
739 new_res = res;
740
741 nd_dbg_dpa(nd_region, ndd, new_res, "%s(%d) %d\n",
742 action, loc, rc);
743
744 if (rc)
745 return n;
746
747 n -= allocate;
748 if (n) {
749 /*
750 * Retry scan with newly inserted resources.
751 * For example, if we did an ALLOC_BEFORE
752 * insertion there may also have been space
753 * available for an ALLOC_AFTER insertion, so we
754 * need to check this same resource again
755 */
756 goto retry;
757 } else
758 return 0;
759 }
760
761 /*
762 * If we allocated nothing in the BLK case it may be because we are in
763 * an initial "pmem-reserve pass". Only do an initial BLK allocation
764 * when none of the DPA space is reserved.
765 */
766 if ((is_pmem || !ndd->dpa.child) && n == to_allocate)
767 return init_dpa_allocation(label_id, nd_region, nd_mapping, n);
768 return n;
769 }
770
771 static int merge_dpa(struct nd_region *nd_region,
772 struct nd_mapping *nd_mapping, struct nd_label_id *label_id)
773 {
774 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
775 struct resource *res;
776
777 if (strncmp("pmem", label_id->id, 4) == 0)
778 return 0;
779 retry:
780 for_each_dpa_resource(ndd, res) {
781 int rc;
782 struct resource *next = res->sibling;
783 resource_size_t end = res->start + resource_size(res);
784
785 if (!next || strcmp(res->name, label_id->id) != 0
786 || strcmp(next->name, label_id->id) != 0
787 || end != next->start)
788 continue;
789 end += resource_size(next);
790 nvdimm_free_dpa(ndd, next);
791 rc = adjust_resource(res, res->start, end - res->start);
792 nd_dbg_dpa(nd_region, ndd, res, "merge %d\n", rc);
793 if (rc)
794 return rc;
795 res->flags |= DPA_RESOURCE_ADJUSTED;
796 goto retry;
797 }
798
799 return 0;
800 }
801
802 static int __reserve_free_pmem(struct device *dev, void *data)
803 {
804 struct nvdimm *nvdimm = data;
805 struct nd_region *nd_region;
806 struct nd_label_id label_id;
807 int i;
808
809 if (!is_memory(dev))
810 return 0;
811
812 nd_region = to_nd_region(dev);
813 if (nd_region->ndr_mappings == 0)
814 return 0;
815
816 memset(&label_id, 0, sizeof(label_id));
817 strcat(label_id.id, "pmem-reserve");
818 for (i = 0; i < nd_region->ndr_mappings; i++) {
819 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
820 resource_size_t n, rem = 0;
821
822 if (nd_mapping->nvdimm != nvdimm)
823 continue;
824
825 n = nd_pmem_available_dpa(nd_region, nd_mapping, &rem);
826 if (n == 0)
827 return 0;
828 rem = scan_allocate(nd_region, nd_mapping, &label_id, n);
829 dev_WARN_ONCE(&nd_region->dev, rem,
830 "pmem reserve underrun: %#llx of %#llx bytes\n",
831 (unsigned long long) n - rem,
832 (unsigned long long) n);
833 return rem ? -ENXIO : 0;
834 }
835
836 return 0;
837 }
838
839 static void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
840 struct nd_mapping *nd_mapping)
841 {
842 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
843 struct resource *res, *_res;
844
845 for_each_dpa_resource_safe(ndd, res, _res)
846 if (strcmp(res->name, "pmem-reserve") == 0)
847 nvdimm_free_dpa(ndd, res);
848 }
849
850 static int reserve_free_pmem(struct nvdimm_bus *nvdimm_bus,
851 struct nd_mapping *nd_mapping)
852 {
853 struct nvdimm *nvdimm = nd_mapping->nvdimm;
854 int rc;
855
856 rc = device_for_each_child(&nvdimm_bus->dev, nvdimm,
857 __reserve_free_pmem);
858 if (rc)
859 release_free_pmem(nvdimm_bus, nd_mapping);
860 return rc;
861 }
862
863 /**
864 * grow_dpa_allocation - for each dimm allocate n bytes for @label_id
865 * @nd_region: the set of dimms to allocate @n more bytes from
866 * @label_id: unique identifier for the namespace consuming this dpa range
867 * @n: number of bytes per-dimm to add to the existing allocation
868 *
869 * Assumes resources are ordered. For BLK regions, first consume
870 * BLK-only available DPA free space, then consume PMEM-aliased DPA
871 * space starting at the highest DPA. For PMEM regions start
872 * allocations from the start of an interleave set and end at the first
873 * BLK allocation or the end of the interleave set, whichever comes
874 * first.
875 */
876 static int grow_dpa_allocation(struct nd_region *nd_region,
877 struct nd_label_id *label_id, resource_size_t n)
878 {
879 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
880 bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
881 int i;
882
883 for (i = 0; i < nd_region->ndr_mappings; i++) {
884 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
885 resource_size_t rem = n;
886 int rc, j;
887
888 /*
889 * In the BLK case try once with all unallocated PMEM
890 * reserved, and once without
891 */
892 for (j = is_pmem; j < 2; j++) {
893 bool blk_only = j == 0;
894
895 if (blk_only) {
896 rc = reserve_free_pmem(nvdimm_bus, nd_mapping);
897 if (rc)
898 return rc;
899 }
900 rem = scan_allocate(nd_region, nd_mapping,
901 label_id, rem);
902 if (blk_only)
903 release_free_pmem(nvdimm_bus, nd_mapping);
904
905 /* try again and allow encroachments into PMEM */
906 if (rem == 0)
907 break;
908 }
909
910 dev_WARN_ONCE(&nd_region->dev, rem,
911 "allocation underrun: %#llx of %#llx bytes\n",
912 (unsigned long long) n - rem,
913 (unsigned long long) n);
914 if (rem)
915 return -ENXIO;
916
917 rc = merge_dpa(nd_region, nd_mapping, label_id);
918 if (rc)
919 return rc;
920 }
921
922 return 0;
923 }
924
925 static void nd_namespace_pmem_set_resource(struct nd_region *nd_region,
926 struct nd_namespace_pmem *nspm, resource_size_t size)
927 {
928 struct resource *res = &nspm->nsio.res;
929 resource_size_t offset = 0;
930
931 if (size && !nspm->uuid) {
932 WARN_ON_ONCE(1);
933 size = 0;
934 }
935
936 if (size && nspm->uuid) {
937 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
938 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
939 struct nd_label_id label_id;
940 struct resource *res;
941
942 if (!ndd) {
943 size = 0;
944 goto out;
945 }
946
947 nd_label_gen_id(&label_id, nspm->uuid, 0);
948
949 /* calculate a spa offset from the dpa allocation offset */
950 for_each_dpa_resource(ndd, res)
951 if (strcmp(res->name, label_id.id) == 0) {
952 offset = (res->start - nd_mapping->start)
953 * nd_region->ndr_mappings;
954 goto out;
955 }
956
957 WARN_ON_ONCE(1);
958 size = 0;
959 }
960
961 out:
962 res->start = nd_region->ndr_start + offset;
963 res->end = res->start + size - 1;
964 }
965
966 static bool uuid_not_set(const u8 *uuid, struct device *dev, const char *where)
967 {
968 if (!uuid) {
969 dev_dbg(dev, "%s: uuid not set\n", where);
970 return true;
971 }
972 return false;
973 }
974
975 static ssize_t __size_store(struct device *dev, unsigned long long val)
976 {
977 resource_size_t allocated = 0, available = 0;
978 struct nd_region *nd_region = to_nd_region(dev->parent);
979 struct nd_namespace_common *ndns = to_ndns(dev);
980 struct nd_mapping *nd_mapping;
981 struct nvdimm_drvdata *ndd;
982 struct nd_label_id label_id;
983 u32 flags = 0, remainder;
984 int rc, i, id = -1;
985 u8 *uuid = NULL;
986
987 if (dev->driver || ndns->claim)
988 return -EBUSY;
989
990 if (is_namespace_pmem(dev)) {
991 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
992
993 uuid = nspm->uuid;
994 id = nspm->id;
995 } else if (is_namespace_blk(dev)) {
996 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
997
998 uuid = nsblk->uuid;
999 flags = NSLABEL_FLAG_LOCAL;
1000 id = nsblk->id;
1001 }
1002
1003 /*
1004 * We need a uuid for the allocation-label and dimm(s) on which
1005 * to store the label.
1006 */
1007 if (uuid_not_set(uuid, dev, __func__))
1008 return -ENXIO;
1009 if (nd_region->ndr_mappings == 0) {
1010 dev_dbg(dev, "%s: not associated with dimm(s)\n", __func__);
1011 return -ENXIO;
1012 }
1013
1014 div_u64_rem(val, SZ_4K * nd_region->ndr_mappings, &remainder);
1015 if (remainder) {
1016 dev_dbg(dev, "%llu is not %dK aligned\n", val,
1017 (SZ_4K * nd_region->ndr_mappings) / SZ_1K);
1018 return -EINVAL;
1019 }
1020
1021 nd_label_gen_id(&label_id, uuid, flags);
1022 for (i = 0; i < nd_region->ndr_mappings; i++) {
1023 nd_mapping = &nd_region->mapping[i];
1024 ndd = to_ndd(nd_mapping);
1025
1026 /*
1027 * All dimms in an interleave set, or the base dimm for a blk
1028 * region, need to be enabled for the size to be changed.
1029 */
1030 if (!ndd)
1031 return -ENXIO;
1032
1033 allocated += nvdimm_allocated_dpa(ndd, &label_id);
1034 }
1035 available = nd_region_available_dpa(nd_region);
1036
1037 if (val > available + allocated)
1038 return -ENOSPC;
1039
1040 if (val == allocated)
1041 return 0;
1042
1043 val = div_u64(val, nd_region->ndr_mappings);
1044 allocated = div_u64(allocated, nd_region->ndr_mappings);
1045 if (val < allocated)
1046 rc = shrink_dpa_allocation(nd_region, &label_id,
1047 allocated - val);
1048 else
1049 rc = grow_dpa_allocation(nd_region, &label_id, val - allocated);
1050
1051 if (rc)
1052 return rc;
1053
1054 if (is_namespace_pmem(dev)) {
1055 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1056
1057 nd_namespace_pmem_set_resource(nd_region, nspm,
1058 val * nd_region->ndr_mappings);
1059 }
1060
1061 /*
1062 * Try to delete the namespace if we deleted all of its
1063 * allocation, this is not the seed or 0th device for the
1064 * region, and it is not actively claimed by a btt, pfn, or dax
1065 * instance.
1066 */
1067 if (val == 0 && id != 0 && nd_region->ns_seed != dev && !ndns->claim)
1068 nd_device_unregister(dev, ND_ASYNC);
1069
1070 return rc;
1071 }
1072
1073 static ssize_t size_store(struct device *dev,
1074 struct device_attribute *attr, const char *buf, size_t len)
1075 {
1076 struct nd_region *nd_region = to_nd_region(dev->parent);
1077 unsigned long long val;
1078 u8 **uuid = NULL;
1079 int rc;
1080
1081 rc = kstrtoull(buf, 0, &val);
1082 if (rc)
1083 return rc;
1084
1085 device_lock(dev);
1086 nvdimm_bus_lock(dev);
1087 wait_nvdimm_bus_probe_idle(dev);
1088 rc = __size_store(dev, val);
1089 if (rc >= 0)
1090 rc = nd_namespace_label_update(nd_region, dev);
1091
1092 if (is_namespace_pmem(dev)) {
1093 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1094
1095 uuid = &nspm->uuid;
1096 } else if (is_namespace_blk(dev)) {
1097 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1098
1099 uuid = &nsblk->uuid;
1100 }
1101
1102 if (rc == 0 && val == 0 && uuid) {
1103 /* setting size zero == 'delete namespace' */
1104 kfree(*uuid);
1105 *uuid = NULL;
1106 }
1107
1108 dev_dbg(dev, "%s: %llx %s (%d)\n", __func__, val, rc < 0
1109 ? "fail" : "success", rc);
1110
1111 nvdimm_bus_unlock(dev);
1112 device_unlock(dev);
1113
1114 return rc < 0 ? rc : len;
1115 }
1116
1117 resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1118 {
1119 struct device *dev = &ndns->dev;
1120
1121 if (is_namespace_pmem(dev)) {
1122 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1123
1124 return resource_size(&nspm->nsio.res);
1125 } else if (is_namespace_blk(dev)) {
1126 return nd_namespace_blk_size(to_nd_namespace_blk(dev));
1127 } else if (is_namespace_io(dev)) {
1128 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
1129
1130 return resource_size(&nsio->res);
1131 } else
1132 WARN_ONCE(1, "unknown namespace type\n");
1133 return 0;
1134 }
1135
1136 resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1137 {
1138 resource_size_t size;
1139
1140 nvdimm_bus_lock(&ndns->dev);
1141 size = __nvdimm_namespace_capacity(ndns);
1142 nvdimm_bus_unlock(&ndns->dev);
1143
1144 return size;
1145 }
1146 EXPORT_SYMBOL(nvdimm_namespace_capacity);
1147
1148 static ssize_t size_show(struct device *dev,
1149 struct device_attribute *attr, char *buf)
1150 {
1151 return sprintf(buf, "%llu\n", (unsigned long long)
1152 nvdimm_namespace_capacity(to_ndns(dev)));
1153 }
1154 static DEVICE_ATTR(size, 0444, size_show, size_store);
1155
1156 static u8 *namespace_to_uuid(struct device *dev)
1157 {
1158 if (is_namespace_pmem(dev)) {
1159 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1160
1161 return nspm->uuid;
1162 } else if (is_namespace_blk(dev)) {
1163 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1164
1165 return nsblk->uuid;
1166 } else
1167 return ERR_PTR(-ENXIO);
1168 }
1169
1170 static ssize_t uuid_show(struct device *dev,
1171 struct device_attribute *attr, char *buf)
1172 {
1173 u8 *uuid = namespace_to_uuid(dev);
1174
1175 if (IS_ERR(uuid))
1176 return PTR_ERR(uuid);
1177 if (uuid)
1178 return sprintf(buf, "%pUb\n", uuid);
1179 return sprintf(buf, "\n");
1180 }
1181
1182 /**
1183 * namespace_update_uuid - check for a unique uuid and whether we're "renaming"
1184 * @nd_region: parent region so we can updates all dimms in the set
1185 * @dev: namespace type for generating label_id
1186 * @new_uuid: incoming uuid
1187 * @old_uuid: reference to the uuid storage location in the namespace object
1188 */
1189 static int namespace_update_uuid(struct nd_region *nd_region,
1190 struct device *dev, u8 *new_uuid, u8 **old_uuid)
1191 {
1192 u32 flags = is_namespace_blk(dev) ? NSLABEL_FLAG_LOCAL : 0;
1193 struct nd_label_id old_label_id;
1194 struct nd_label_id new_label_id;
1195 int i;
1196
1197 if (!nd_is_uuid_unique(dev, new_uuid))
1198 return -EINVAL;
1199
1200 if (*old_uuid == NULL)
1201 goto out;
1202
1203 /*
1204 * If we've already written a label with this uuid, then it's
1205 * too late to rename because we can't reliably update the uuid
1206 * without losing the old namespace. Userspace must delete this
1207 * namespace to abandon the old uuid.
1208 */
1209 for (i = 0; i < nd_region->ndr_mappings; i++) {
1210 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1211
1212 /*
1213 * This check by itself is sufficient because old_uuid
1214 * would be NULL above if this uuid did not exist in the
1215 * currently written set.
1216 *
1217 * FIXME: can we delete uuid with zero dpa allocated?
1218 */
1219 if (list_empty(&nd_mapping->labels))
1220 return -EBUSY;
1221 }
1222
1223 nd_label_gen_id(&old_label_id, *old_uuid, flags);
1224 nd_label_gen_id(&new_label_id, new_uuid, flags);
1225 for (i = 0; i < nd_region->ndr_mappings; i++) {
1226 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1227 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1228 struct resource *res;
1229
1230 for_each_dpa_resource(ndd, res)
1231 if (strcmp(res->name, old_label_id.id) == 0)
1232 sprintf((void *) res->name, "%s",
1233 new_label_id.id);
1234 }
1235 kfree(*old_uuid);
1236 out:
1237 *old_uuid = new_uuid;
1238 return 0;
1239 }
1240
1241 static ssize_t uuid_store(struct device *dev,
1242 struct device_attribute *attr, const char *buf, size_t len)
1243 {
1244 struct nd_region *nd_region = to_nd_region(dev->parent);
1245 u8 *uuid = NULL;
1246 ssize_t rc = 0;
1247 u8 **ns_uuid;
1248
1249 if (is_namespace_pmem(dev)) {
1250 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1251
1252 ns_uuid = &nspm->uuid;
1253 } else if (is_namespace_blk(dev)) {
1254 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1255
1256 ns_uuid = &nsblk->uuid;
1257 } else
1258 return -ENXIO;
1259
1260 device_lock(dev);
1261 nvdimm_bus_lock(dev);
1262 wait_nvdimm_bus_probe_idle(dev);
1263 if (to_ndns(dev)->claim)
1264 rc = -EBUSY;
1265 if (rc >= 0)
1266 rc = nd_uuid_store(dev, &uuid, buf, len);
1267 if (rc >= 0)
1268 rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid);
1269 if (rc >= 0)
1270 rc = nd_namespace_label_update(nd_region, dev);
1271 else
1272 kfree(uuid);
1273 dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
1274 rc, buf, buf[len - 1] == '\n' ? "" : "\n");
1275 nvdimm_bus_unlock(dev);
1276 device_unlock(dev);
1277
1278 return rc < 0 ? rc : len;
1279 }
1280 static DEVICE_ATTR_RW(uuid);
1281
1282 static ssize_t resource_show(struct device *dev,
1283 struct device_attribute *attr, char *buf)
1284 {
1285 struct resource *res;
1286
1287 if (is_namespace_pmem(dev)) {
1288 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1289
1290 res = &nspm->nsio.res;
1291 } else if (is_namespace_io(dev)) {
1292 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
1293
1294 res = &nsio->res;
1295 } else
1296 return -ENXIO;
1297
1298 /* no address to convey if the namespace has no allocation */
1299 if (resource_size(res) == 0)
1300 return -ENXIO;
1301 return sprintf(buf, "%#llx\n", (unsigned long long) res->start);
1302 }
1303 static DEVICE_ATTR_RO(resource);
1304
1305 static const unsigned long blk_lbasize_supported[] = { 512, 520, 528,
1306 4096, 4104, 4160, 4224, 0 };
1307
1308 static const unsigned long pmem_lbasize_supported[] = { 512, 4096, 0 };
1309
1310 static ssize_t sector_size_show(struct device *dev,
1311 struct device_attribute *attr, char *buf)
1312 {
1313 if (is_namespace_blk(dev)) {
1314 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1315
1316 return nd_size_select_show(nsblk->lbasize,
1317 blk_lbasize_supported, buf);
1318 }
1319
1320 if (is_namespace_pmem(dev)) {
1321 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1322
1323 return nd_size_select_show(nspm->lbasize,
1324 pmem_lbasize_supported, buf);
1325 }
1326 return -ENXIO;
1327 }
1328
1329 static ssize_t sector_size_store(struct device *dev,
1330 struct device_attribute *attr, const char *buf, size_t len)
1331 {
1332 struct nd_region *nd_region = to_nd_region(dev->parent);
1333 const unsigned long *supported;
1334 unsigned long *lbasize;
1335 ssize_t rc = 0;
1336
1337 if (is_namespace_blk(dev)) {
1338 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1339
1340 lbasize = &nsblk->lbasize;
1341 supported = blk_lbasize_supported;
1342 } else if (is_namespace_pmem(dev)) {
1343 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1344
1345 lbasize = &nspm->lbasize;
1346 supported = pmem_lbasize_supported;
1347 } else
1348 return -ENXIO;
1349
1350 device_lock(dev);
1351 nvdimm_bus_lock(dev);
1352 if (to_ndns(dev)->claim)
1353 rc = -EBUSY;
1354 if (rc >= 0)
1355 rc = nd_size_select_store(dev, buf, lbasize, supported);
1356 if (rc >= 0)
1357 rc = nd_namespace_label_update(nd_region, dev);
1358 dev_dbg(dev, "%s: result: %zd %s: %s%s", __func__,
1359 rc, rc < 0 ? "tried" : "wrote", buf,
1360 buf[len - 1] == '\n' ? "" : "\n");
1361 nvdimm_bus_unlock(dev);
1362 device_unlock(dev);
1363
1364 return rc ? rc : len;
1365 }
1366 static DEVICE_ATTR_RW(sector_size);
1367
1368 static ssize_t dpa_extents_show(struct device *dev,
1369 struct device_attribute *attr, char *buf)
1370 {
1371 struct nd_region *nd_region = to_nd_region(dev->parent);
1372 struct nd_label_id label_id;
1373 int count = 0, i;
1374 u8 *uuid = NULL;
1375 u32 flags = 0;
1376
1377 nvdimm_bus_lock(dev);
1378 if (is_namespace_pmem(dev)) {
1379 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1380
1381 uuid = nspm->uuid;
1382 flags = 0;
1383 } else if (is_namespace_blk(dev)) {
1384 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1385
1386 uuid = nsblk->uuid;
1387 flags = NSLABEL_FLAG_LOCAL;
1388 }
1389
1390 if (!uuid)
1391 goto out;
1392
1393 nd_label_gen_id(&label_id, uuid, flags);
1394 for (i = 0; i < nd_region->ndr_mappings; i++) {
1395 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1396 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1397 struct resource *res;
1398
1399 for_each_dpa_resource(ndd, res)
1400 if (strcmp(res->name, label_id.id) == 0)
1401 count++;
1402 }
1403 out:
1404 nvdimm_bus_unlock(dev);
1405
1406 return sprintf(buf, "%d\n", count);
1407 }
1408 static DEVICE_ATTR_RO(dpa_extents);
1409
1410 static int btt_claim_class(struct device *dev)
1411 {
1412 struct nd_region *nd_region = to_nd_region(dev->parent);
1413 int i, loop_bitmask = 0;
1414
1415 for (i = 0; i < nd_region->ndr_mappings; i++) {
1416 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1417 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1418 struct nd_namespace_index *nsindex;
1419
1420 /*
1421 * If any of the DIMMs do not support labels the only
1422 * possible BTT format is v1.
1423 */
1424 if (!ndd) {
1425 loop_bitmask = 0;
1426 break;
1427 }
1428
1429 nsindex = to_namespace_index(ndd, ndd->ns_current);
1430 if (nsindex == NULL)
1431 loop_bitmask |= 1;
1432 else {
1433 /* check whether existing labels are v1.1 or v1.2 */
1434 if (__le16_to_cpu(nsindex->major) == 1
1435 && __le16_to_cpu(nsindex->minor) == 1)
1436 loop_bitmask |= 2;
1437 else
1438 loop_bitmask |= 4;
1439 }
1440 }
1441 /*
1442 * If nsindex is null loop_bitmask's bit 0 will be set, and if an index
1443 * block is found, a v1.1 label for any mapping will set bit 1, and a
1444 * v1.2 label will set bit 2.
1445 *
1446 * At the end of the loop, at most one of the three bits must be set.
1447 * If multiple bits were set, it means the different mappings disagree
1448 * about their labels, and this must be cleaned up first.
1449 *
1450 * If all the label index blocks are found to agree, nsindex of NULL
1451 * implies labels haven't been initialized yet, and when they will,
1452 * they will be of the 1.2 format, so we can assume BTT2.0
1453 *
1454 * If 1.1 labels are found, we enforce BTT1.1, and if 1.2 labels are
1455 * found, we enforce BTT2.0
1456 *
1457 * If the loop was never entered, default to BTT1.1 (legacy namespaces)
1458 */
1459 switch (loop_bitmask) {
1460 case 0:
1461 case 2:
1462 return NVDIMM_CCLASS_BTT;
1463 case 1:
1464 case 4:
1465 return NVDIMM_CCLASS_BTT2;
1466 default:
1467 return -ENXIO;
1468 }
1469 }
1470
1471 static ssize_t holder_show(struct device *dev,
1472 struct device_attribute *attr, char *buf)
1473 {
1474 struct nd_namespace_common *ndns = to_ndns(dev);
1475 ssize_t rc;
1476
1477 device_lock(dev);
1478 rc = sprintf(buf, "%s\n", ndns->claim ? dev_name(ndns->claim) : "");
1479 device_unlock(dev);
1480
1481 return rc;
1482 }
1483 static DEVICE_ATTR_RO(holder);
1484
1485 static ssize_t __holder_class_store(struct device *dev, const char *buf)
1486 {
1487 struct nd_namespace_common *ndns = to_ndns(dev);
1488
1489 if (dev->driver || ndns->claim)
1490 return -EBUSY;
1491
1492 if (strcmp(buf, "btt") == 0 || strcmp(buf, "btt\n") == 0)
1493 ndns->claim_class = btt_claim_class(dev);
1494 else if (strcmp(buf, "pfn") == 0 || strcmp(buf, "pfn\n") == 0)
1495 ndns->claim_class = NVDIMM_CCLASS_PFN;
1496 else if (strcmp(buf, "dax") == 0 || strcmp(buf, "dax\n") == 0)
1497 ndns->claim_class = NVDIMM_CCLASS_DAX;
1498 else if (strcmp(buf, "") == 0 || strcmp(buf, "\n") == 0)
1499 ndns->claim_class = NVDIMM_CCLASS_NONE;
1500 else
1501 return -EINVAL;
1502
1503 /* btt_claim_class() could've returned an error */
1504 if (ndns->claim_class < 0)
1505 return ndns->claim_class;
1506
1507 return 0;
1508 }
1509
1510 static ssize_t holder_class_store(struct device *dev,
1511 struct device_attribute *attr, const char *buf, size_t len)
1512 {
1513 struct nd_region *nd_region = to_nd_region(dev->parent);
1514 ssize_t rc;
1515
1516 device_lock(dev);
1517 nvdimm_bus_lock(dev);
1518 wait_nvdimm_bus_probe_idle(dev);
1519 rc = __holder_class_store(dev, buf);
1520 if (rc >= 0)
1521 rc = nd_namespace_label_update(nd_region, dev);
1522 dev_dbg(dev, "%s: %s(%zd)\n", __func__, rc < 0 ? "fail " : "", rc);
1523 nvdimm_bus_unlock(dev);
1524 device_unlock(dev);
1525
1526 return rc < 0 ? rc : len;
1527 }
1528
1529 static ssize_t holder_class_show(struct device *dev,
1530 struct device_attribute *attr, char *buf)
1531 {
1532 struct nd_namespace_common *ndns = to_ndns(dev);
1533 ssize_t rc;
1534
1535 device_lock(dev);
1536 if (ndns->claim_class == NVDIMM_CCLASS_NONE)
1537 rc = sprintf(buf, "\n");
1538 else if ((ndns->claim_class == NVDIMM_CCLASS_BTT) ||
1539 (ndns->claim_class == NVDIMM_CCLASS_BTT2))
1540 rc = sprintf(buf, "btt\n");
1541 else if (ndns->claim_class == NVDIMM_CCLASS_PFN)
1542 rc = sprintf(buf, "pfn\n");
1543 else if (ndns->claim_class == NVDIMM_CCLASS_DAX)
1544 rc = sprintf(buf, "dax\n");
1545 else
1546 rc = sprintf(buf, "<unknown>\n");
1547 device_unlock(dev);
1548
1549 return rc;
1550 }
1551 static DEVICE_ATTR_RW(holder_class);
1552
1553 static ssize_t mode_show(struct device *dev,
1554 struct device_attribute *attr, char *buf)
1555 {
1556 struct nd_namespace_common *ndns = to_ndns(dev);
1557 struct device *claim;
1558 char *mode;
1559 ssize_t rc;
1560
1561 device_lock(dev);
1562 claim = ndns->claim;
1563 if (claim && is_nd_btt(claim))
1564 mode = "safe";
1565 else if (claim && is_nd_pfn(claim))
1566 mode = "memory";
1567 else if (claim && is_nd_dax(claim))
1568 mode = "dax";
1569 else if (!claim && pmem_should_map_pages(dev))
1570 mode = "memory";
1571 else
1572 mode = "raw";
1573 rc = sprintf(buf, "%s\n", mode);
1574 device_unlock(dev);
1575
1576 return rc;
1577 }
1578 static DEVICE_ATTR_RO(mode);
1579
1580 static ssize_t force_raw_store(struct device *dev,
1581 struct device_attribute *attr, const char *buf, size_t len)
1582 {
1583 bool force_raw;
1584 int rc = strtobool(buf, &force_raw);
1585
1586 if (rc)
1587 return rc;
1588
1589 to_ndns(dev)->force_raw = force_raw;
1590 return len;
1591 }
1592
1593 static ssize_t force_raw_show(struct device *dev,
1594 struct device_attribute *attr, char *buf)
1595 {
1596 return sprintf(buf, "%d\n", to_ndns(dev)->force_raw);
1597 }
1598 static DEVICE_ATTR_RW(force_raw);
1599
1600 static struct attribute *nd_namespace_attributes[] = {
1601 &dev_attr_nstype.attr,
1602 &dev_attr_size.attr,
1603 &dev_attr_mode.attr,
1604 &dev_attr_uuid.attr,
1605 &dev_attr_holder.attr,
1606 &dev_attr_resource.attr,
1607 &dev_attr_alt_name.attr,
1608 &dev_attr_force_raw.attr,
1609 &dev_attr_sector_size.attr,
1610 &dev_attr_dpa_extents.attr,
1611 &dev_attr_holder_class.attr,
1612 NULL,
1613 };
1614
1615 static umode_t namespace_visible(struct kobject *kobj,
1616 struct attribute *a, int n)
1617 {
1618 struct device *dev = container_of(kobj, struct device, kobj);
1619
1620 if (a == &dev_attr_resource.attr) {
1621 if (is_namespace_blk(dev))
1622 return 0;
1623 return 0400;
1624 }
1625
1626 if (is_namespace_pmem(dev) || is_namespace_blk(dev)) {
1627 if (a == &dev_attr_size.attr)
1628 return 0644;
1629
1630 return a->mode;
1631 }
1632
1633 if (a == &dev_attr_nstype.attr || a == &dev_attr_size.attr
1634 || a == &dev_attr_holder.attr
1635 || a == &dev_attr_holder_class.attr
1636 || a == &dev_attr_force_raw.attr
1637 || a == &dev_attr_mode.attr)
1638 return a->mode;
1639
1640 return 0;
1641 }
1642
1643 static struct attribute_group nd_namespace_attribute_group = {
1644 .attrs = nd_namespace_attributes,
1645 .is_visible = namespace_visible,
1646 };
1647
1648 static const struct attribute_group *nd_namespace_attribute_groups[] = {
1649 &nd_device_attribute_group,
1650 &nd_namespace_attribute_group,
1651 &nd_numa_attribute_group,
1652 NULL,
1653 };
1654
1655 struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev)
1656 {
1657 struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL;
1658 struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL;
1659 struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL;
1660 struct nd_namespace_common *ndns = NULL;
1661 resource_size_t size;
1662
1663 if (nd_btt || nd_pfn || nd_dax) {
1664 if (nd_btt)
1665 ndns = nd_btt->ndns;
1666 else if (nd_pfn)
1667 ndns = nd_pfn->ndns;
1668 else if (nd_dax)
1669 ndns = nd_dax->nd_pfn.ndns;
1670
1671 if (!ndns)
1672 return ERR_PTR(-ENODEV);
1673
1674 /*
1675 * Flush any in-progess probes / removals in the driver
1676 * for the raw personality of this namespace.
1677 */
1678 device_lock(&ndns->dev);
1679 device_unlock(&ndns->dev);
1680 if (ndns->dev.driver) {
1681 dev_dbg(&ndns->dev, "is active, can't bind %s\n",
1682 dev_name(dev));
1683 return ERR_PTR(-EBUSY);
1684 }
1685 if (dev_WARN_ONCE(&ndns->dev, ndns->claim != dev,
1686 "host (%s) vs claim (%s) mismatch\n",
1687 dev_name(dev),
1688 dev_name(ndns->claim)))
1689 return ERR_PTR(-ENXIO);
1690 } else {
1691 ndns = to_ndns(dev);
1692 if (ndns->claim) {
1693 dev_dbg(dev, "claimed by %s, failing probe\n",
1694 dev_name(ndns->claim));
1695
1696 return ERR_PTR(-ENXIO);
1697 }
1698 }
1699
1700 size = nvdimm_namespace_capacity(ndns);
1701 if (size < ND_MIN_NAMESPACE_SIZE) {
1702 dev_dbg(&ndns->dev, "%pa, too small must be at least %#x\n",
1703 &size, ND_MIN_NAMESPACE_SIZE);
1704 return ERR_PTR(-ENODEV);
1705 }
1706
1707 if (is_namespace_pmem(&ndns->dev)) {
1708 struct nd_namespace_pmem *nspm;
1709
1710 nspm = to_nd_namespace_pmem(&ndns->dev);
1711 if (uuid_not_set(nspm->uuid, &ndns->dev, __func__))
1712 return ERR_PTR(-ENODEV);
1713 } else if (is_namespace_blk(&ndns->dev)) {
1714 struct nd_namespace_blk *nsblk;
1715
1716 nsblk = to_nd_namespace_blk(&ndns->dev);
1717 if (uuid_not_set(nsblk->uuid, &ndns->dev, __func__))
1718 return ERR_PTR(-ENODEV);
1719 if (!nsblk->lbasize) {
1720 dev_dbg(&ndns->dev, "%s: sector size not set\n",
1721 __func__);
1722 return ERR_PTR(-ENODEV);
1723 }
1724 if (!nd_namespace_blk_validate(nsblk))
1725 return ERR_PTR(-ENODEV);
1726 }
1727
1728 return ndns;
1729 }
1730 EXPORT_SYMBOL(nvdimm_namespace_common_probe);
1731
1732 static struct device **create_namespace_io(struct nd_region *nd_region)
1733 {
1734 struct nd_namespace_io *nsio;
1735 struct device *dev, **devs;
1736 struct resource *res;
1737
1738 nsio = kzalloc(sizeof(*nsio), GFP_KERNEL);
1739 if (!nsio)
1740 return NULL;
1741
1742 devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL);
1743 if (!devs) {
1744 kfree(nsio);
1745 return NULL;
1746 }
1747
1748 dev = &nsio->common.dev;
1749 dev->type = &namespace_io_device_type;
1750 dev->parent = &nd_region->dev;
1751 res = &nsio->res;
1752 res->name = dev_name(&nd_region->dev);
1753 res->flags = IORESOURCE_MEM;
1754 res->start = nd_region->ndr_start;
1755 res->end = res->start + nd_region->ndr_size - 1;
1756
1757 devs[0] = dev;
1758 return devs;
1759 }
1760
1761 static bool has_uuid_at_pos(struct nd_region *nd_region, u8 *uuid,
1762 u64 cookie, u16 pos)
1763 {
1764 struct nd_namespace_label *found = NULL;
1765 int i;
1766
1767 for (i = 0; i < nd_region->ndr_mappings; i++) {
1768 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1769 struct nd_interleave_set *nd_set = nd_region->nd_set;
1770 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1771 struct nd_label_ent *label_ent;
1772 bool found_uuid = false;
1773
1774 list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1775 struct nd_namespace_label *nd_label = label_ent->label;
1776 u16 position, nlabel;
1777 u64 isetcookie;
1778
1779 if (!nd_label)
1780 continue;
1781 isetcookie = __le64_to_cpu(nd_label->isetcookie);
1782 position = __le16_to_cpu(nd_label->position);
1783 nlabel = __le16_to_cpu(nd_label->nlabel);
1784
1785 if (isetcookie != cookie)
1786 continue;
1787
1788 if (memcmp(nd_label->uuid, uuid, NSLABEL_UUID_LEN) != 0)
1789 continue;
1790
1791 if (namespace_label_has(ndd, type_guid)
1792 && !guid_equal(&nd_set->type_guid,
1793 &nd_label->type_guid)) {
1794 dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n",
1795 nd_set->type_guid.b,
1796 nd_label->type_guid.b);
1797 continue;
1798 }
1799
1800 if (found_uuid) {
1801 dev_dbg(ndd->dev,
1802 "%s duplicate entry for uuid\n",
1803 __func__);
1804 return false;
1805 }
1806 found_uuid = true;
1807 if (nlabel != nd_region->ndr_mappings)
1808 continue;
1809 if (position != pos)
1810 continue;
1811 found = nd_label;
1812 break;
1813 }
1814 if (found)
1815 break;
1816 }
1817 return found != NULL;
1818 }
1819
1820 static int select_pmem_id(struct nd_region *nd_region, u8 *pmem_id)
1821 {
1822 int i;
1823
1824 if (!pmem_id)
1825 return -ENODEV;
1826
1827 for (i = 0; i < nd_region->ndr_mappings; i++) {
1828 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1829 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1830 struct nd_namespace_label *nd_label = NULL;
1831 u64 hw_start, hw_end, pmem_start, pmem_end;
1832 struct nd_label_ent *label_ent;
1833
1834 lockdep_assert_held(&nd_mapping->lock);
1835 list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1836 nd_label = label_ent->label;
1837 if (!nd_label)
1838 continue;
1839 if (memcmp(nd_label->uuid, pmem_id, NSLABEL_UUID_LEN) == 0)
1840 break;
1841 nd_label = NULL;
1842 }
1843
1844 if (!nd_label) {
1845 WARN_ON(1);
1846 return -EINVAL;
1847 }
1848
1849 /*
1850 * Check that this label is compliant with the dpa
1851 * range published in NFIT
1852 */
1853 hw_start = nd_mapping->start;
1854 hw_end = hw_start + nd_mapping->size;
1855 pmem_start = __le64_to_cpu(nd_label->dpa);
1856 pmem_end = pmem_start + __le64_to_cpu(nd_label->rawsize);
1857 if (pmem_start >= hw_start && pmem_start < hw_end
1858 && pmem_end <= hw_end && pmem_end > hw_start)
1859 /* pass */;
1860 else {
1861 dev_dbg(&nd_region->dev, "%s invalid label for %pUb\n",
1862 dev_name(ndd->dev), nd_label->uuid);
1863 return -EINVAL;
1864 }
1865
1866 /* move recently validated label to the front of the list */
1867 list_move(&label_ent->list, &nd_mapping->labels);
1868 }
1869 return 0;
1870 }
1871
1872 /**
1873 * create_namespace_pmem - validate interleave set labelling, retrieve label0
1874 * @nd_region: region with mappings to validate
1875 * @nspm: target namespace to create
1876 * @nd_label: target pmem namespace label to evaluate
1877 */
1878 struct device *create_namespace_pmem(struct nd_region *nd_region,
1879 struct nd_namespace_index *nsindex,
1880 struct nd_namespace_label *nd_label)
1881 {
1882 u64 cookie = nd_region_interleave_set_cookie(nd_region, nsindex);
1883 u64 altcookie = nd_region_interleave_set_altcookie(nd_region);
1884 struct nd_label_ent *label_ent;
1885 struct nd_namespace_pmem *nspm;
1886 struct nd_mapping *nd_mapping;
1887 resource_size_t size = 0;
1888 struct resource *res;
1889 struct device *dev;
1890 int rc = 0;
1891 u16 i;
1892
1893 if (cookie == 0) {
1894 dev_dbg(&nd_region->dev, "invalid interleave-set-cookie\n");
1895 return ERR_PTR(-ENXIO);
1896 }
1897
1898 if (__le64_to_cpu(nd_label->isetcookie) != cookie) {
1899 dev_dbg(&nd_region->dev, "invalid cookie in label: %pUb\n",
1900 nd_label->uuid);
1901 if (__le64_to_cpu(nd_label->isetcookie) != altcookie)
1902 return ERR_PTR(-EAGAIN);
1903
1904 dev_dbg(&nd_region->dev, "valid altcookie in label: %pUb\n",
1905 nd_label->uuid);
1906 }
1907
1908 nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
1909 if (!nspm)
1910 return ERR_PTR(-ENOMEM);
1911
1912 nspm->id = -1;
1913 dev = &nspm->nsio.common.dev;
1914 dev->type = &namespace_pmem_device_type;
1915 dev->parent = &nd_region->dev;
1916 res = &nspm->nsio.res;
1917 res->name = dev_name(&nd_region->dev);
1918 res->flags = IORESOURCE_MEM;
1919
1920 for (i = 0; i < nd_region->ndr_mappings; i++) {
1921 if (has_uuid_at_pos(nd_region, nd_label->uuid, cookie, i))
1922 continue;
1923 if (has_uuid_at_pos(nd_region, nd_label->uuid, altcookie, i))
1924 continue;
1925 break;
1926 }
1927
1928 if (i < nd_region->ndr_mappings) {
1929 struct nvdimm_drvdata *ndd = to_ndd(&nd_region->mapping[i]);
1930
1931 /*
1932 * Give up if we don't find an instance of a uuid at each
1933 * position (from 0 to nd_region->ndr_mappings - 1), or if we
1934 * find a dimm with two instances of the same uuid.
1935 */
1936 dev_err(&nd_region->dev, "%s missing label for %pUb\n",
1937 dev_name(ndd->dev), nd_label->uuid);
1938 rc = -EINVAL;
1939 goto err;
1940 }
1941
1942 /*
1943 * Fix up each mapping's 'labels' to have the validated pmem label for
1944 * that position at labels[0], and NULL at labels[1]. In the process,
1945 * check that the namespace aligns with interleave-set. We know
1946 * that it does not overlap with any blk namespaces by virtue of
1947 * the dimm being enabled (i.e. nd_label_reserve_dpa()
1948 * succeeded).
1949 */
1950 rc = select_pmem_id(nd_region, nd_label->uuid);
1951 if (rc)
1952 goto err;
1953
1954 /* Calculate total size and populate namespace properties from label0 */
1955 for (i = 0; i < nd_region->ndr_mappings; i++) {
1956 struct nd_namespace_label *label0;
1957 struct nvdimm_drvdata *ndd;
1958
1959 nd_mapping = &nd_region->mapping[i];
1960 label_ent = list_first_entry_or_null(&nd_mapping->labels,
1961 typeof(*label_ent), list);
1962 label0 = label_ent ? label_ent->label : 0;
1963
1964 if (!label0) {
1965 WARN_ON(1);
1966 continue;
1967 }
1968
1969 size += __le64_to_cpu(label0->rawsize);
1970 if (__le16_to_cpu(label0->position) != 0)
1971 continue;
1972 WARN_ON(nspm->alt_name || nspm->uuid);
1973 nspm->alt_name = kmemdup((void __force *) label0->name,
1974 NSLABEL_NAME_LEN, GFP_KERNEL);
1975 nspm->uuid = kmemdup((void __force *) label0->uuid,
1976 NSLABEL_UUID_LEN, GFP_KERNEL);
1977 nspm->lbasize = __le64_to_cpu(label0->lbasize);
1978 ndd = to_ndd(nd_mapping);
1979 if (namespace_label_has(ndd, abstraction_guid))
1980 nspm->nsio.common.claim_class
1981 = to_nvdimm_cclass(&label0->abstraction_guid);
1982
1983 }
1984
1985 if (!nspm->alt_name || !nspm->uuid) {
1986 rc = -ENOMEM;
1987 goto err;
1988 }
1989
1990 nd_namespace_pmem_set_resource(nd_region, nspm, size);
1991
1992 return dev;
1993 err:
1994 namespace_pmem_release(dev);
1995 switch (rc) {
1996 case -EINVAL:
1997 dev_dbg(&nd_region->dev, "%s: invalid label(s)\n", __func__);
1998 break;
1999 case -ENODEV:
2000 dev_dbg(&nd_region->dev, "%s: label not found\n", __func__);
2001 break;
2002 default:
2003 dev_dbg(&nd_region->dev, "%s: unexpected err: %d\n",
2004 __func__, rc);
2005 break;
2006 }
2007 return ERR_PTR(rc);
2008 }
2009
2010 struct resource *nsblk_add_resource(struct nd_region *nd_region,
2011 struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk,
2012 resource_size_t start)
2013 {
2014 struct nd_label_id label_id;
2015 struct resource *res;
2016
2017 nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
2018 res = krealloc(nsblk->res,
2019 sizeof(void *) * (nsblk->num_resources + 1),
2020 GFP_KERNEL);
2021 if (!res)
2022 return NULL;
2023 nsblk->res = (struct resource **) res;
2024 for_each_dpa_resource(ndd, res)
2025 if (strcmp(res->name, label_id.id) == 0
2026 && res->start == start) {
2027 nsblk->res[nsblk->num_resources++] = res;
2028 return res;
2029 }
2030 return NULL;
2031 }
2032
2033 static struct device *nd_namespace_blk_create(struct nd_region *nd_region)
2034 {
2035 struct nd_namespace_blk *nsblk;
2036 struct device *dev;
2037
2038 if (!is_nd_blk(&nd_region->dev))
2039 return NULL;
2040
2041 nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2042 if (!nsblk)
2043 return NULL;
2044
2045 dev = &nsblk->common.dev;
2046 dev->type = &namespace_blk_device_type;
2047 nsblk->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
2048 if (nsblk->id < 0) {
2049 kfree(nsblk);
2050 return NULL;
2051 }
2052 dev_set_name(dev, "namespace%d.%d", nd_region->id, nsblk->id);
2053 dev->parent = &nd_region->dev;
2054 dev->groups = nd_namespace_attribute_groups;
2055
2056 return &nsblk->common.dev;
2057 }
2058
2059 static struct device *nd_namespace_pmem_create(struct nd_region *nd_region)
2060 {
2061 struct nd_namespace_pmem *nspm;
2062 struct resource *res;
2063 struct device *dev;
2064
2065 if (!is_memory(&nd_region->dev))
2066 return NULL;
2067
2068 nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
2069 if (!nspm)
2070 return NULL;
2071
2072 dev = &nspm->nsio.common.dev;
2073 dev->type = &namespace_pmem_device_type;
2074 dev->parent = &nd_region->dev;
2075 res = &nspm->nsio.res;
2076 res->name = dev_name(&nd_region->dev);
2077 res->flags = IORESOURCE_MEM;
2078
2079 nspm->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
2080 if (nspm->id < 0) {
2081 kfree(nspm);
2082 return NULL;
2083 }
2084 dev_set_name(dev, "namespace%d.%d", nd_region->id, nspm->id);
2085 dev->parent = &nd_region->dev;
2086 dev->groups = nd_namespace_attribute_groups;
2087 nd_namespace_pmem_set_resource(nd_region, nspm, 0);
2088
2089 return dev;
2090 }
2091
2092 void nd_region_create_ns_seed(struct nd_region *nd_region)
2093 {
2094 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2095
2096 if (nd_region_to_nstype(nd_region) == ND_DEVICE_NAMESPACE_IO)
2097 return;
2098
2099 if (is_nd_blk(&nd_region->dev))
2100 nd_region->ns_seed = nd_namespace_blk_create(nd_region);
2101 else
2102 nd_region->ns_seed = nd_namespace_pmem_create(nd_region);
2103
2104 /*
2105 * Seed creation failures are not fatal, provisioning is simply
2106 * disabled until memory becomes available
2107 */
2108 if (!nd_region->ns_seed)
2109 dev_err(&nd_region->dev, "failed to create %s namespace\n",
2110 is_nd_blk(&nd_region->dev) ? "blk" : "pmem");
2111 else
2112 nd_device_register(nd_region->ns_seed);
2113 }
2114
2115 void nd_region_create_dax_seed(struct nd_region *nd_region)
2116 {
2117 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2118 nd_region->dax_seed = nd_dax_create(nd_region);
2119 /*
2120 * Seed creation failures are not fatal, provisioning is simply
2121 * disabled until memory becomes available
2122 */
2123 if (!nd_region->dax_seed)
2124 dev_err(&nd_region->dev, "failed to create dax namespace\n");
2125 }
2126
2127 void nd_region_create_pfn_seed(struct nd_region *nd_region)
2128 {
2129 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2130 nd_region->pfn_seed = nd_pfn_create(nd_region);
2131 /*
2132 * Seed creation failures are not fatal, provisioning is simply
2133 * disabled until memory becomes available
2134 */
2135 if (!nd_region->pfn_seed)
2136 dev_err(&nd_region->dev, "failed to create pfn namespace\n");
2137 }
2138
2139 void nd_region_create_btt_seed(struct nd_region *nd_region)
2140 {
2141 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2142 nd_region->btt_seed = nd_btt_create(nd_region);
2143 /*
2144 * Seed creation failures are not fatal, provisioning is simply
2145 * disabled until memory becomes available
2146 */
2147 if (!nd_region->btt_seed)
2148 dev_err(&nd_region->dev, "failed to create btt namespace\n");
2149 }
2150
2151 static int add_namespace_resource(struct nd_region *nd_region,
2152 struct nd_namespace_label *nd_label, struct device **devs,
2153 int count)
2154 {
2155 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2156 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2157 int i;
2158
2159 for (i = 0; i < count; i++) {
2160 u8 *uuid = namespace_to_uuid(devs[i]);
2161 struct resource *res;
2162
2163 if (IS_ERR_OR_NULL(uuid)) {
2164 WARN_ON(1);
2165 continue;
2166 }
2167
2168 if (memcmp(uuid, nd_label->uuid, NSLABEL_UUID_LEN) != 0)
2169 continue;
2170 if (is_namespace_blk(devs[i])) {
2171 res = nsblk_add_resource(nd_region, ndd,
2172 to_nd_namespace_blk(devs[i]),
2173 __le64_to_cpu(nd_label->dpa));
2174 if (!res)
2175 return -ENXIO;
2176 nd_dbg_dpa(nd_region, ndd, res, "%d assign\n", count);
2177 } else {
2178 dev_err(&nd_region->dev,
2179 "error: conflicting extents for uuid: %pUb\n",
2180 nd_label->uuid);
2181 return -ENXIO;
2182 }
2183 break;
2184 }
2185
2186 return i;
2187 }
2188
2189 struct device *create_namespace_blk(struct nd_region *nd_region,
2190 struct nd_namespace_label *nd_label, int count)
2191 {
2192
2193 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2194 struct nd_interleave_set *nd_set = nd_region->nd_set;
2195 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2196 struct nd_namespace_blk *nsblk;
2197 char name[NSLABEL_NAME_LEN];
2198 struct device *dev = NULL;
2199 struct resource *res;
2200
2201 if (namespace_label_has(ndd, type_guid)) {
2202 if (!guid_equal(&nd_set->type_guid, &nd_label->type_guid)) {
2203 dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n",
2204 nd_set->type_guid.b,
2205 nd_label->type_guid.b);
2206 return ERR_PTR(-EAGAIN);
2207 }
2208
2209 if (nd_label->isetcookie != __cpu_to_le64(nd_set->cookie2)) {
2210 dev_dbg(ndd->dev, "expect cookie %#llx got %#llx\n",
2211 nd_set->cookie2,
2212 __le64_to_cpu(nd_label->isetcookie));
2213 return ERR_PTR(-EAGAIN);
2214 }
2215 }
2216
2217 nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2218 if (!nsblk)
2219 return ERR_PTR(-ENOMEM);
2220 dev = &nsblk->common.dev;
2221 dev->type = &namespace_blk_device_type;
2222 dev->parent = &nd_region->dev;
2223 nsblk->id = -1;
2224 nsblk->lbasize = __le64_to_cpu(nd_label->lbasize);
2225 nsblk->uuid = kmemdup(nd_label->uuid, NSLABEL_UUID_LEN,
2226 GFP_KERNEL);
2227 if (namespace_label_has(ndd, abstraction_guid))
2228 nsblk->common.claim_class
2229 = to_nvdimm_cclass(&nd_label->abstraction_guid);
2230 if (!nsblk->uuid)
2231 goto blk_err;
2232 memcpy(name, nd_label->name, NSLABEL_NAME_LEN);
2233 if (name[0])
2234 nsblk->alt_name = kmemdup(name, NSLABEL_NAME_LEN,
2235 GFP_KERNEL);
2236 res = nsblk_add_resource(nd_region, ndd, nsblk,
2237 __le64_to_cpu(nd_label->dpa));
2238 if (!res)
2239 goto blk_err;
2240 nd_dbg_dpa(nd_region, ndd, res, "%d: assign\n", count);
2241 return dev;
2242 blk_err:
2243 namespace_blk_release(dev);
2244 return ERR_PTR(-ENXIO);
2245 }
2246
2247 static int cmp_dpa(const void *a, const void *b)
2248 {
2249 const struct device *dev_a = *(const struct device **) a;
2250 const struct device *dev_b = *(const struct device **) b;
2251 struct nd_namespace_blk *nsblk_a, *nsblk_b;
2252 struct nd_namespace_pmem *nspm_a, *nspm_b;
2253
2254 if (is_namespace_io(dev_a))
2255 return 0;
2256
2257 if (is_namespace_blk(dev_a)) {
2258 nsblk_a = to_nd_namespace_blk(dev_a);
2259 nsblk_b = to_nd_namespace_blk(dev_b);
2260
2261 return memcmp(&nsblk_a->res[0]->start, &nsblk_b->res[0]->start,
2262 sizeof(resource_size_t));
2263 }
2264
2265 nspm_a = to_nd_namespace_pmem(dev_a);
2266 nspm_b = to_nd_namespace_pmem(dev_b);
2267
2268 return memcmp(&nspm_a->nsio.res.start, &nspm_b->nsio.res.start,
2269 sizeof(resource_size_t));
2270 }
2271
2272 static struct device **scan_labels(struct nd_region *nd_region)
2273 {
2274 int i, count = 0;
2275 struct device *dev, **devs = NULL;
2276 struct nd_label_ent *label_ent, *e;
2277 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2278 resource_size_t map_end = nd_mapping->start + nd_mapping->size - 1;
2279
2280 /* "safe" because create_namespace_pmem() might list_move() label_ent */
2281 list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
2282 struct nd_namespace_label *nd_label = label_ent->label;
2283 struct device **__devs;
2284 u32 flags;
2285
2286 if (!nd_label)
2287 continue;
2288 flags = __le32_to_cpu(nd_label->flags);
2289 if (is_nd_blk(&nd_region->dev)
2290 == !!(flags & NSLABEL_FLAG_LOCAL))
2291 /* pass, region matches label type */;
2292 else
2293 continue;
2294
2295 /* skip labels that describe extents outside of the region */
2296 if (nd_label->dpa < nd_mapping->start || nd_label->dpa > map_end)
2297 continue;
2298
2299 i = add_namespace_resource(nd_region, nd_label, devs, count);
2300 if (i < 0)
2301 goto err;
2302 if (i < count)
2303 continue;
2304 __devs = kcalloc(count + 2, sizeof(dev), GFP_KERNEL);
2305 if (!__devs)
2306 goto err;
2307 memcpy(__devs, devs, sizeof(dev) * count);
2308 kfree(devs);
2309 devs = __devs;
2310
2311 if (is_nd_blk(&nd_region->dev))
2312 dev = create_namespace_blk(nd_region, nd_label, count);
2313 else {
2314 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2315 struct nd_namespace_index *nsindex;
2316
2317 nsindex = to_namespace_index(ndd, ndd->ns_current);
2318 dev = create_namespace_pmem(nd_region, nsindex, nd_label);
2319 }
2320
2321 if (IS_ERR(dev)) {
2322 switch (PTR_ERR(dev)) {
2323 case -EAGAIN:
2324 /* skip invalid labels */
2325 continue;
2326 case -ENODEV:
2327 /* fallthrough to seed creation */
2328 break;
2329 default:
2330 goto err;
2331 }
2332 } else
2333 devs[count++] = dev;
2334
2335 }
2336
2337 dev_dbg(&nd_region->dev, "%s: discovered %d %s namespace%s\n",
2338 __func__, count, is_nd_blk(&nd_region->dev)
2339 ? "blk" : "pmem", count == 1 ? "" : "s");
2340
2341 if (count == 0) {
2342 /* Publish a zero-sized namespace for userspace to configure. */
2343 nd_mapping_free_labels(nd_mapping);
2344
2345 devs = kcalloc(2, sizeof(dev), GFP_KERNEL);
2346 if (!devs)
2347 goto err;
2348 if (is_nd_blk(&nd_region->dev)) {
2349 struct nd_namespace_blk *nsblk;
2350
2351 nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2352 if (!nsblk)
2353 goto err;
2354 dev = &nsblk->common.dev;
2355 dev->type = &namespace_blk_device_type;
2356 } else {
2357 struct nd_namespace_pmem *nspm;
2358
2359 nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
2360 if (!nspm)
2361 goto err;
2362 dev = &nspm->nsio.common.dev;
2363 dev->type = &namespace_pmem_device_type;
2364 nd_namespace_pmem_set_resource(nd_region, nspm, 0);
2365 }
2366 dev->parent = &nd_region->dev;
2367 devs[count++] = dev;
2368 } else if (is_memory(&nd_region->dev)) {
2369 /* clean unselected labels */
2370 for (i = 0; i < nd_region->ndr_mappings; i++) {
2371 struct list_head *l, *e;
2372 LIST_HEAD(list);
2373 int j;
2374
2375 nd_mapping = &nd_region->mapping[i];
2376 if (list_empty(&nd_mapping->labels)) {
2377 WARN_ON(1);
2378 continue;
2379 }
2380
2381 j = count;
2382 list_for_each_safe(l, e, &nd_mapping->labels) {
2383 if (!j--)
2384 break;
2385 list_move_tail(l, &list);
2386 }
2387 nd_mapping_free_labels(nd_mapping);
2388 list_splice_init(&list, &nd_mapping->labels);
2389 }
2390 }
2391
2392 if (count > 1)
2393 sort(devs, count, sizeof(struct device *), cmp_dpa, NULL);
2394
2395 return devs;
2396
2397 err:
2398 if (devs) {
2399 for (i = 0; devs[i]; i++)
2400 if (is_nd_blk(&nd_region->dev))
2401 namespace_blk_release(devs[i]);
2402 else
2403 namespace_pmem_release(devs[i]);
2404 kfree(devs);
2405 }
2406 return NULL;
2407 }
2408
2409 static struct device **create_namespaces(struct nd_region *nd_region)
2410 {
2411 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2412 struct device **devs;
2413 int i;
2414
2415 if (nd_region->ndr_mappings == 0)
2416 return NULL;
2417
2418 /* lock down all mappings while we scan labels */
2419 for (i = 0; i < nd_region->ndr_mappings; i++) {
2420 nd_mapping = &nd_region->mapping[i];
2421 mutex_lock_nested(&nd_mapping->lock, i);
2422 }
2423
2424 devs = scan_labels(nd_region);
2425
2426 for (i = 0; i < nd_region->ndr_mappings; i++) {
2427 int reverse = nd_region->ndr_mappings - 1 - i;
2428
2429 nd_mapping = &nd_region->mapping[reverse];
2430 mutex_unlock(&nd_mapping->lock);
2431 }
2432
2433 return devs;
2434 }
2435
2436 static int init_active_labels(struct nd_region *nd_region)
2437 {
2438 int i;
2439
2440 for (i = 0; i < nd_region->ndr_mappings; i++) {
2441 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
2442 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2443 struct nvdimm *nvdimm = nd_mapping->nvdimm;
2444 struct nd_label_ent *label_ent;
2445 int count, j;
2446
2447 /*
2448 * If the dimm is disabled then we may need to prevent
2449 * the region from being activated.
2450 */
2451 if (!ndd) {
2452 if (test_bit(NDD_LOCKED, &nvdimm->flags))
2453 /* fail, label data may be unreadable */;
2454 else if (test_bit(NDD_ALIASING, &nvdimm->flags))
2455 /* fail, labels needed to disambiguate dpa */;
2456 else
2457 return 0;
2458
2459 dev_err(&nd_region->dev, "%s: is %s, failing probe\n",
2460 dev_name(&nd_mapping->nvdimm->dev),
2461 test_bit(NDD_LOCKED, &nvdimm->flags)
2462 ? "locked" : "disabled");
2463 return -ENXIO;
2464 }
2465 nd_mapping->ndd = ndd;
2466 atomic_inc(&nvdimm->busy);
2467 get_ndd(ndd);
2468
2469 count = nd_label_active_count(ndd);
2470 dev_dbg(ndd->dev, "%s: %d\n", __func__, count);
2471 if (!count)
2472 continue;
2473 for (j = 0; j < count; j++) {
2474 struct nd_namespace_label *label;
2475
2476 label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL);
2477 if (!label_ent)
2478 break;
2479 label = nd_label_active(ndd, j);
2480 label_ent->label = label;
2481
2482 mutex_lock(&nd_mapping->lock);
2483 list_add_tail(&label_ent->list, &nd_mapping->labels);
2484 mutex_unlock(&nd_mapping->lock);
2485 }
2486
2487 if (j >= count)
2488 continue;
2489
2490 mutex_lock(&nd_mapping->lock);
2491 nd_mapping_free_labels(nd_mapping);
2492 mutex_unlock(&nd_mapping->lock);
2493 return -ENOMEM;
2494 }
2495
2496 return 0;
2497 }
2498
2499 int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
2500 {
2501 struct device **devs = NULL;
2502 int i, rc = 0, type;
2503
2504 *err = 0;
2505 nvdimm_bus_lock(&nd_region->dev);
2506 rc = init_active_labels(nd_region);
2507 if (rc) {
2508 nvdimm_bus_unlock(&nd_region->dev);
2509 return rc;
2510 }
2511
2512 type = nd_region_to_nstype(nd_region);
2513 switch (type) {
2514 case ND_DEVICE_NAMESPACE_IO:
2515 devs = create_namespace_io(nd_region);
2516 break;
2517 case ND_DEVICE_NAMESPACE_PMEM:
2518 case ND_DEVICE_NAMESPACE_BLK:
2519 devs = create_namespaces(nd_region);
2520 break;
2521 default:
2522 break;
2523 }
2524 nvdimm_bus_unlock(&nd_region->dev);
2525
2526 if (!devs)
2527 return -ENODEV;
2528
2529 for (i = 0; devs[i]; i++) {
2530 struct device *dev = devs[i];
2531 int id;
2532
2533 if (type == ND_DEVICE_NAMESPACE_BLK) {
2534 struct nd_namespace_blk *nsblk;
2535
2536 nsblk = to_nd_namespace_blk(dev);
2537 id = ida_simple_get(&nd_region->ns_ida, 0, 0,
2538 GFP_KERNEL);
2539 nsblk->id = id;
2540 } else if (type == ND_DEVICE_NAMESPACE_PMEM) {
2541 struct nd_namespace_pmem *nspm;
2542
2543 nspm = to_nd_namespace_pmem(dev);
2544 id = ida_simple_get(&nd_region->ns_ida, 0, 0,
2545 GFP_KERNEL);
2546 nspm->id = id;
2547 } else
2548 id = i;
2549
2550 if (id < 0)
2551 break;
2552 dev_set_name(dev, "namespace%d.%d", nd_region->id, id);
2553 dev->groups = nd_namespace_attribute_groups;
2554 nd_device_register(dev);
2555 }
2556 if (i)
2557 nd_region->ns_seed = devs[0];
2558
2559 if (devs[i]) {
2560 int j;
2561
2562 for (j = i; devs[j]; j++) {
2563 struct device *dev = devs[j];
2564
2565 device_initialize(dev);
2566 put_device(dev);
2567 }
2568 *err = j - i;
2569 /*
2570 * All of the namespaces we tried to register failed, so
2571 * fail region activation.
2572 */
2573 if (*err == 0)
2574 rc = -ENODEV;
2575 }
2576 kfree(devs);
2577
2578 if (rc == -ENODEV)
2579 return rc;
2580
2581 return i;
2582 }
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