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