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ALSA: hda/ca0132 - Call pci_iounmap() instead of iounmap()
[linux/fpc-iii.git] / drivers / nvdimm / namespace_devs.c
blob681af3a8fd62eead13b17bdcbb6785b96aabe2ac
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(%zd)\n", 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 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 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, "not associated with dimm(s)\n");
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_allocatable_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, "%llx %s (%d)\n", val, rc < 0 ? "fail" : "success", rc);
1109
1110 nvdimm_bus_unlock(dev);
1111 device_unlock(dev);
1112
1113 return rc < 0 ? rc : len;
1114 }
1115
1116 resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1117 {
1118 struct device *dev = &ndns->dev;
1119
1120 if (is_namespace_pmem(dev)) {
1121 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1122
1123 return resource_size(&nspm->nsio.res);
1124 } else if (is_namespace_blk(dev)) {
1125 return nd_namespace_blk_size(to_nd_namespace_blk(dev));
1126 } else if (is_namespace_io(dev)) {
1127 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
1128
1129 return resource_size(&nsio->res);
1130 } else
1131 WARN_ONCE(1, "unknown namespace type\n");
1132 return 0;
1133 }
1134
1135 resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1136 {
1137 resource_size_t size;
1138
1139 nvdimm_bus_lock(&ndns->dev);
1140 size = __nvdimm_namespace_capacity(ndns);
1141 nvdimm_bus_unlock(&ndns->dev);
1142
1143 return size;
1144 }
1145 EXPORT_SYMBOL(nvdimm_namespace_capacity);
1146
1147 bool nvdimm_namespace_locked(struct nd_namespace_common *ndns)
1148 {
1149 int i;
1150 bool locked = false;
1151 struct device *dev = &ndns->dev;
1152 struct nd_region *nd_region = to_nd_region(dev->parent);
1153
1154 for (i = 0; i < nd_region->ndr_mappings; i++) {
1155 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1156 struct nvdimm *nvdimm = nd_mapping->nvdimm;
1157
1158 if (test_bit(NDD_LOCKED, &nvdimm->flags)) {
1159 dev_dbg(dev, "%s locked\n", nvdimm_name(nvdimm));
1160 locked = true;
1161 }
1162 }
1163 return locked;
1164 }
1165 EXPORT_SYMBOL(nvdimm_namespace_locked);
1166
1167 static ssize_t size_show(struct device *dev,
1168 struct device_attribute *attr, char *buf)
1169 {
1170 return sprintf(buf, "%llu\n", (unsigned long long)
1171 nvdimm_namespace_capacity(to_ndns(dev)));
1172 }
1173 static DEVICE_ATTR(size, 0444, size_show, size_store);
1174
1175 static u8 *namespace_to_uuid(struct device *dev)
1176 {
1177 if (is_namespace_pmem(dev)) {
1178 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1179
1180 return nspm->uuid;
1181 } else if (is_namespace_blk(dev)) {
1182 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1183
1184 return nsblk->uuid;
1185 } else
1186 return ERR_PTR(-ENXIO);
1187 }
1188
1189 static ssize_t uuid_show(struct device *dev,
1190 struct device_attribute *attr, char *buf)
1191 {
1192 u8 *uuid = namespace_to_uuid(dev);
1193
1194 if (IS_ERR(uuid))
1195 return PTR_ERR(uuid);
1196 if (uuid)
1197 return sprintf(buf, "%pUb\n", uuid);
1198 return sprintf(buf, "\n");
1199 }
1200
1201 /**
1202 * namespace_update_uuid - check for a unique uuid and whether we're "renaming"
1203 * @nd_region: parent region so we can updates all dimms in the set
1204 * @dev: namespace type for generating label_id
1205 * @new_uuid: incoming uuid
1206 * @old_uuid: reference to the uuid storage location in the namespace object
1207 */
1208 static int namespace_update_uuid(struct nd_region *nd_region,
1209 struct device *dev, u8 *new_uuid, u8 **old_uuid)
1210 {
1211 u32 flags = is_namespace_blk(dev) ? NSLABEL_FLAG_LOCAL : 0;
1212 struct nd_label_id old_label_id;
1213 struct nd_label_id new_label_id;
1214 int i;
1215
1216 if (!nd_is_uuid_unique(dev, new_uuid))
1217 return -EINVAL;
1218
1219 if (*old_uuid == NULL)
1220 goto out;
1221
1222 /*
1223 * If we've already written a label with this uuid, then it's
1224 * too late to rename because we can't reliably update the uuid
1225 * without losing the old namespace. Userspace must delete this
1226 * namespace to abandon the old uuid.
1227 */
1228 for (i = 0; i < nd_region->ndr_mappings; i++) {
1229 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1230
1231 /*
1232 * This check by itself is sufficient because old_uuid
1233 * would be NULL above if this uuid did not exist in the
1234 * currently written set.
1235 *
1236 * FIXME: can we delete uuid with zero dpa allocated?
1237 */
1238 if (list_empty(&nd_mapping->labels))
1239 return -EBUSY;
1240 }
1241
1242 nd_label_gen_id(&old_label_id, *old_uuid, flags);
1243 nd_label_gen_id(&new_label_id, new_uuid, flags);
1244 for (i = 0; i < nd_region->ndr_mappings; i++) {
1245 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1246 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1247 struct resource *res;
1248
1249 for_each_dpa_resource(ndd, res)
1250 if (strcmp(res->name, old_label_id.id) == 0)
1251 sprintf((void *) res->name, "%s",
1252 new_label_id.id);
1253 }
1254 kfree(*old_uuid);
1255 out:
1256 *old_uuid = new_uuid;
1257 return 0;
1258 }
1259
1260 static ssize_t uuid_store(struct device *dev,
1261 struct device_attribute *attr, const char *buf, size_t len)
1262 {
1263 struct nd_region *nd_region = to_nd_region(dev->parent);
1264 u8 *uuid = NULL;
1265 ssize_t rc = 0;
1266 u8 **ns_uuid;
1267
1268 if (is_namespace_pmem(dev)) {
1269 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1270
1271 ns_uuid = &nspm->uuid;
1272 } else if (is_namespace_blk(dev)) {
1273 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1274
1275 ns_uuid = &nsblk->uuid;
1276 } else
1277 return -ENXIO;
1278
1279 device_lock(dev);
1280 nvdimm_bus_lock(dev);
1281 wait_nvdimm_bus_probe_idle(dev);
1282 if (to_ndns(dev)->claim)
1283 rc = -EBUSY;
1284 if (rc >= 0)
1285 rc = nd_uuid_store(dev, &uuid, buf, len);
1286 if (rc >= 0)
1287 rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid);
1288 if (rc >= 0)
1289 rc = nd_namespace_label_update(nd_region, dev);
1290 else
1291 kfree(uuid);
1292 dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
1293 buf[len - 1] == '\n' ? "" : "\n");
1294 nvdimm_bus_unlock(dev);
1295 device_unlock(dev);
1296
1297 return rc < 0 ? rc : len;
1298 }
1299 static DEVICE_ATTR_RW(uuid);
1300
1301 static ssize_t resource_show(struct device *dev,
1302 struct device_attribute *attr, char *buf)
1303 {
1304 struct resource *res;
1305
1306 if (is_namespace_pmem(dev)) {
1307 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1308
1309 res = &nspm->nsio.res;
1310 } else if (is_namespace_io(dev)) {
1311 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
1312
1313 res = &nsio->res;
1314 } else
1315 return -ENXIO;
1316
1317 /* no address to convey if the namespace has no allocation */
1318 if (resource_size(res) == 0)
1319 return -ENXIO;
1320 return sprintf(buf, "%#llx\n", (unsigned long long) res->start);
1321 }
1322 static DEVICE_ATTR_RO(resource);
1323
1324 static const unsigned long blk_lbasize_supported[] = { 512, 520, 528,
1325 4096, 4104, 4160, 4224, 0 };
1326
1327 static const unsigned long pmem_lbasize_supported[] = { 512, 4096, 0 };
1328
1329 static ssize_t sector_size_show(struct device *dev,
1330 struct device_attribute *attr, char *buf)
1331 {
1332 if (is_namespace_blk(dev)) {
1333 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1334
1335 return nd_size_select_show(nsblk->lbasize,
1336 blk_lbasize_supported, buf);
1337 }
1338
1339 if (is_namespace_pmem(dev)) {
1340 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1341
1342 return nd_size_select_show(nspm->lbasize,
1343 pmem_lbasize_supported, buf);
1344 }
1345 return -ENXIO;
1346 }
1347
1348 static ssize_t sector_size_store(struct device *dev,
1349 struct device_attribute *attr, const char *buf, size_t len)
1350 {
1351 struct nd_region *nd_region = to_nd_region(dev->parent);
1352 const unsigned long *supported;
1353 unsigned long *lbasize;
1354 ssize_t rc = 0;
1355
1356 if (is_namespace_blk(dev)) {
1357 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1358
1359 lbasize = &nsblk->lbasize;
1360 supported = blk_lbasize_supported;
1361 } else if (is_namespace_pmem(dev)) {
1362 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1363
1364 lbasize = &nspm->lbasize;
1365 supported = pmem_lbasize_supported;
1366 } else
1367 return -ENXIO;
1368
1369 device_lock(dev);
1370 nvdimm_bus_lock(dev);
1371 if (to_ndns(dev)->claim)
1372 rc = -EBUSY;
1373 if (rc >= 0)
1374 rc = nd_size_select_store(dev, buf, lbasize, supported);
1375 if (rc >= 0)
1376 rc = nd_namespace_label_update(nd_region, dev);
1377 dev_dbg(dev, "result: %zd %s: %s%s", rc, rc < 0 ? "tried" : "wrote",
1378 buf, buf[len - 1] == '\n' ? "" : "\n");
1379 nvdimm_bus_unlock(dev);
1380 device_unlock(dev);
1381
1382 return rc ? rc : len;
1383 }
1384 static DEVICE_ATTR_RW(sector_size);
1385
1386 static ssize_t dpa_extents_show(struct device *dev,
1387 struct device_attribute *attr, char *buf)
1388 {
1389 struct nd_region *nd_region = to_nd_region(dev->parent);
1390 struct nd_label_id label_id;
1391 int count = 0, i;
1392 u8 *uuid = NULL;
1393 u32 flags = 0;
1394
1395 nvdimm_bus_lock(dev);
1396 if (is_namespace_pmem(dev)) {
1397 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1398
1399 uuid = nspm->uuid;
1400 flags = 0;
1401 } else if (is_namespace_blk(dev)) {
1402 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1403
1404 uuid = nsblk->uuid;
1405 flags = NSLABEL_FLAG_LOCAL;
1406 }
1407
1408 if (!uuid)
1409 goto out;
1410
1411 nd_label_gen_id(&label_id, uuid, flags);
1412 for (i = 0; i < nd_region->ndr_mappings; i++) {
1413 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1414 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1415 struct resource *res;
1416
1417 for_each_dpa_resource(ndd, res)
1418 if (strcmp(res->name, label_id.id) == 0)
1419 count++;
1420 }
1421 out:
1422 nvdimm_bus_unlock(dev);
1423
1424 return sprintf(buf, "%d\n", count);
1425 }
1426 static DEVICE_ATTR_RO(dpa_extents);
1427
1428 static int btt_claim_class(struct device *dev)
1429 {
1430 struct nd_region *nd_region = to_nd_region(dev->parent);
1431 int i, loop_bitmask = 0;
1432
1433 for (i = 0; i < nd_region->ndr_mappings; i++) {
1434 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1435 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1436 struct nd_namespace_index *nsindex;
1437
1438 /*
1439 * If any of the DIMMs do not support labels the only
1440 * possible BTT format is v1.
1441 */
1442 if (!ndd) {
1443 loop_bitmask = 0;
1444 break;
1445 }
1446
1447 nsindex = to_namespace_index(ndd, ndd->ns_current);
1448 if (nsindex == NULL)
1449 loop_bitmask |= 1;
1450 else {
1451 /* check whether existing labels are v1.1 or v1.2 */
1452 if (__le16_to_cpu(nsindex->major) == 1
1453 && __le16_to_cpu(nsindex->minor) == 1)
1454 loop_bitmask |= 2;
1455 else
1456 loop_bitmask |= 4;
1457 }
1458 }
1459 /*
1460 * If nsindex is null loop_bitmask's bit 0 will be set, and if an index
1461 * block is found, a v1.1 label for any mapping will set bit 1, and a
1462 * v1.2 label will set bit 2.
1463 *
1464 * At the end of the loop, at most one of the three bits must be set.
1465 * If multiple bits were set, it means the different mappings disagree
1466 * about their labels, and this must be cleaned up first.
1467 *
1468 * If all the label index blocks are found to agree, nsindex of NULL
1469 * implies labels haven't been initialized yet, and when they will,
1470 * they will be of the 1.2 format, so we can assume BTT2.0
1471 *
1472 * If 1.1 labels are found, we enforce BTT1.1, and if 1.2 labels are
1473 * found, we enforce BTT2.0
1474 *
1475 * If the loop was never entered, default to BTT1.1 (legacy namespaces)
1476 */
1477 switch (loop_bitmask) {
1478 case 0:
1479 case 2:
1480 return NVDIMM_CCLASS_BTT;
1481 case 1:
1482 case 4:
1483 return NVDIMM_CCLASS_BTT2;
1484 default:
1485 return -ENXIO;
1486 }
1487 }
1488
1489 static ssize_t holder_show(struct device *dev,
1490 struct device_attribute *attr, char *buf)
1491 {
1492 struct nd_namespace_common *ndns = to_ndns(dev);
1493 ssize_t rc;
1494
1495 device_lock(dev);
1496 rc = sprintf(buf, "%s\n", ndns->claim ? dev_name(ndns->claim) : "");
1497 device_unlock(dev);
1498
1499 return rc;
1500 }
1501 static DEVICE_ATTR_RO(holder);
1502
1503 static ssize_t __holder_class_store(struct device *dev, const char *buf)
1504 {
1505 struct nd_namespace_common *ndns = to_ndns(dev);
1506
1507 if (dev->driver || ndns->claim)
1508 return -EBUSY;
1509
1510 if (strcmp(buf, "btt") == 0 || strcmp(buf, "btt\n") == 0)
1511 ndns->claim_class = btt_claim_class(dev);
1512 else if (strcmp(buf, "pfn") == 0 || strcmp(buf, "pfn\n") == 0)
1513 ndns->claim_class = NVDIMM_CCLASS_PFN;
1514 else if (strcmp(buf, "dax") == 0 || strcmp(buf, "dax\n") == 0)
1515 ndns->claim_class = NVDIMM_CCLASS_DAX;
1516 else if (strcmp(buf, "") == 0 || strcmp(buf, "\n") == 0)
1517 ndns->claim_class = NVDIMM_CCLASS_NONE;
1518 else
1519 return -EINVAL;
1520
1521 /* btt_claim_class() could've returned an error */
1522 if (ndns->claim_class < 0)
1523 return ndns->claim_class;
1524
1525 return 0;
1526 }
1527
1528 static ssize_t holder_class_store(struct device *dev,
1529 struct device_attribute *attr, const char *buf, size_t len)
1530 {
1531 struct nd_region *nd_region = to_nd_region(dev->parent);
1532 ssize_t rc;
1533
1534 device_lock(dev);
1535 nvdimm_bus_lock(dev);
1536 wait_nvdimm_bus_probe_idle(dev);
1537 rc = __holder_class_store(dev, buf);
1538 if (rc >= 0)
1539 rc = nd_namespace_label_update(nd_region, dev);
1540 dev_dbg(dev, "%s(%zd)\n", rc < 0 ? "fail " : "", rc);
1541 nvdimm_bus_unlock(dev);
1542 device_unlock(dev);
1543
1544 return rc < 0 ? rc : len;
1545 }
1546
1547 static ssize_t holder_class_show(struct device *dev,
1548 struct device_attribute *attr, char *buf)
1549 {
1550 struct nd_namespace_common *ndns = to_ndns(dev);
1551 ssize_t rc;
1552
1553 device_lock(dev);
1554 if (ndns->claim_class == NVDIMM_CCLASS_NONE)
1555 rc = sprintf(buf, "\n");
1556 else if ((ndns->claim_class == NVDIMM_CCLASS_BTT) ||
1557 (ndns->claim_class == NVDIMM_CCLASS_BTT2))
1558 rc = sprintf(buf, "btt\n");
1559 else if (ndns->claim_class == NVDIMM_CCLASS_PFN)
1560 rc = sprintf(buf, "pfn\n");
1561 else if (ndns->claim_class == NVDIMM_CCLASS_DAX)
1562 rc = sprintf(buf, "dax\n");
1563 else
1564 rc = sprintf(buf, "<unknown>\n");
1565 device_unlock(dev);
1566
1567 return rc;
1568 }
1569 static DEVICE_ATTR_RW(holder_class);
1570
1571 static ssize_t mode_show(struct device *dev,
1572 struct device_attribute *attr, char *buf)
1573 {
1574 struct nd_namespace_common *ndns = to_ndns(dev);
1575 struct device *claim;
1576 char *mode;
1577 ssize_t rc;
1578
1579 device_lock(dev);
1580 claim = ndns->claim;
1581 if (claim && is_nd_btt(claim))
1582 mode = "safe";
1583 else if (claim && is_nd_pfn(claim))
1584 mode = "memory";
1585 else if (claim && is_nd_dax(claim))
1586 mode = "dax";
1587 else if (!claim && pmem_should_map_pages(dev))
1588 mode = "memory";
1589 else
1590 mode = "raw";
1591 rc = sprintf(buf, "%s\n", mode);
1592 device_unlock(dev);
1593
1594 return rc;
1595 }
1596 static DEVICE_ATTR_RO(mode);
1597
1598 static ssize_t force_raw_store(struct device *dev,
1599 struct device_attribute *attr, const char *buf, size_t len)
1600 {
1601 bool force_raw;
1602 int rc = strtobool(buf, &force_raw);
1603
1604 if (rc)
1605 return rc;
1606
1607 to_ndns(dev)->force_raw = force_raw;
1608 return len;
1609 }
1610
1611 static ssize_t force_raw_show(struct device *dev,
1612 struct device_attribute *attr, char *buf)
1613 {
1614 return sprintf(buf, "%d\n", to_ndns(dev)->force_raw);
1615 }
1616 static DEVICE_ATTR_RW(force_raw);
1617
1618 static struct attribute *nd_namespace_attributes[] = {
1619 &dev_attr_nstype.attr,
1620 &dev_attr_size.attr,
1621 &dev_attr_mode.attr,
1622 &dev_attr_uuid.attr,
1623 &dev_attr_holder.attr,
1624 &dev_attr_resource.attr,
1625 &dev_attr_alt_name.attr,
1626 &dev_attr_force_raw.attr,
1627 &dev_attr_sector_size.attr,
1628 &dev_attr_dpa_extents.attr,
1629 &dev_attr_holder_class.attr,
1630 NULL,
1631 };
1632
1633 static umode_t namespace_visible(struct kobject *kobj,
1634 struct attribute *a, int n)
1635 {
1636 struct device *dev = container_of(kobj, struct device, kobj);
1637
1638 if (a == &dev_attr_resource.attr) {
1639 if (is_namespace_blk(dev))
1640 return 0;
1641 return 0400;
1642 }
1643
1644 if (is_namespace_pmem(dev) || is_namespace_blk(dev)) {
1645 if (a == &dev_attr_size.attr)
1646 return 0644;
1647
1648 return a->mode;
1649 }
1650
1651 if (a == &dev_attr_nstype.attr || a == &dev_attr_size.attr
1652 || a == &dev_attr_holder.attr
1653 || a == &dev_attr_holder_class.attr
1654 || a == &dev_attr_force_raw.attr
1655 || a == &dev_attr_mode.attr)
1656 return a->mode;
1657
1658 return 0;
1659 }
1660
1661 static struct attribute_group nd_namespace_attribute_group = {
1662 .attrs = nd_namespace_attributes,
1663 .is_visible = namespace_visible,
1664 };
1665
1666 static const struct attribute_group *nd_namespace_attribute_groups[] = {
1667 &nd_device_attribute_group,
1668 &nd_namespace_attribute_group,
1669 &nd_numa_attribute_group,
1670 NULL,
1671 };
1672
1673 struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev)
1674 {
1675 struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL;
1676 struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL;
1677 struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL;
1678 struct nd_namespace_common *ndns = NULL;
1679 resource_size_t size;
1680
1681 if (nd_btt || nd_pfn || nd_dax) {
1682 if (nd_btt)
1683 ndns = nd_btt->ndns;
1684 else if (nd_pfn)
1685 ndns = nd_pfn->ndns;
1686 else if (nd_dax)
1687 ndns = nd_dax->nd_pfn.ndns;
1688
1689 if (!ndns)
1690 return ERR_PTR(-ENODEV);
1691
1692 /*
1693 * Flush any in-progess probes / removals in the driver
1694 * for the raw personality of this namespace.
1695 */
1696 device_lock(&ndns->dev);
1697 device_unlock(&ndns->dev);
1698 if (ndns->dev.driver) {
1699 dev_dbg(&ndns->dev, "is active, can't bind %s\n",
1700 dev_name(dev));
1701 return ERR_PTR(-EBUSY);
1702 }
1703 if (dev_WARN_ONCE(&ndns->dev, ndns->claim != dev,
1704 "host (%s) vs claim (%s) mismatch\n",
1705 dev_name(dev),
1706 dev_name(ndns->claim)))
1707 return ERR_PTR(-ENXIO);
1708 } else {
1709 ndns = to_ndns(dev);
1710 if (ndns->claim) {
1711 dev_dbg(dev, "claimed by %s, failing probe\n",
1712 dev_name(ndns->claim));
1713
1714 return ERR_PTR(-ENXIO);
1715 }
1716 }
1717
1718 if (nvdimm_namespace_locked(ndns))
1719 return ERR_PTR(-EACCES);
1720
1721 size = nvdimm_namespace_capacity(ndns);
1722 if (size < ND_MIN_NAMESPACE_SIZE) {
1723 dev_dbg(&ndns->dev, "%pa, too small must be at least %#x\n",
1724 &size, ND_MIN_NAMESPACE_SIZE);
1725 return ERR_PTR(-ENODEV);
1726 }
1727
1728 if (is_namespace_pmem(&ndns->dev)) {
1729 struct nd_namespace_pmem *nspm;
1730
1731 nspm = to_nd_namespace_pmem(&ndns->dev);
1732 if (uuid_not_set(nspm->uuid, &ndns->dev, __func__))
1733 return ERR_PTR(-ENODEV);
1734 } else if (is_namespace_blk(&ndns->dev)) {
1735 struct nd_namespace_blk *nsblk;
1736
1737 nsblk = to_nd_namespace_blk(&ndns->dev);
1738 if (uuid_not_set(nsblk->uuid, &ndns->dev, __func__))
1739 return ERR_PTR(-ENODEV);
1740 if (!nsblk->lbasize) {
1741 dev_dbg(&ndns->dev, "sector size not set\n");
1742 return ERR_PTR(-ENODEV);
1743 }
1744 if (!nd_namespace_blk_validate(nsblk))
1745 return ERR_PTR(-ENODEV);
1746 }
1747
1748 return ndns;
1749 }
1750 EXPORT_SYMBOL(nvdimm_namespace_common_probe);
1751
1752 static struct device **create_namespace_io(struct nd_region *nd_region)
1753 {
1754 struct nd_namespace_io *nsio;
1755 struct device *dev, **devs;
1756 struct resource *res;
1757
1758 nsio = kzalloc(sizeof(*nsio), GFP_KERNEL);
1759 if (!nsio)
1760 return NULL;
1761
1762 devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL);
1763 if (!devs) {
1764 kfree(nsio);
1765 return NULL;
1766 }
1767
1768 dev = &nsio->common.dev;
1769 dev->type = &namespace_io_device_type;
1770 dev->parent = &nd_region->dev;
1771 res = &nsio->res;
1772 res->name = dev_name(&nd_region->dev);
1773 res->flags = IORESOURCE_MEM;
1774 res->start = nd_region->ndr_start;
1775 res->end = res->start + nd_region->ndr_size - 1;
1776
1777 devs[0] = dev;
1778 return devs;
1779 }
1780
1781 static bool has_uuid_at_pos(struct nd_region *nd_region, u8 *uuid,
1782 u64 cookie, u16 pos)
1783 {
1784 struct nd_namespace_label *found = NULL;
1785 int i;
1786
1787 for (i = 0; i < nd_region->ndr_mappings; i++) {
1788 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1789 struct nd_interleave_set *nd_set = nd_region->nd_set;
1790 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1791 struct nd_label_ent *label_ent;
1792 bool found_uuid = false;
1793
1794 list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1795 struct nd_namespace_label *nd_label = label_ent->label;
1796 u16 position, nlabel;
1797 u64 isetcookie;
1798
1799 if (!nd_label)
1800 continue;
1801 isetcookie = __le64_to_cpu(nd_label->isetcookie);
1802 position = __le16_to_cpu(nd_label->position);
1803 nlabel = __le16_to_cpu(nd_label->nlabel);
1804
1805 if (isetcookie != cookie)
1806 continue;
1807
1808 if (memcmp(nd_label->uuid, uuid, NSLABEL_UUID_LEN) != 0)
1809 continue;
1810
1811 if (namespace_label_has(ndd, type_guid)
1812 && !guid_equal(&nd_set->type_guid,
1813 &nd_label->type_guid)) {
1814 dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n",
1815 nd_set->type_guid.b,
1816 nd_label->type_guid.b);
1817 continue;
1818 }
1819
1820 if (found_uuid) {
1821 dev_dbg(ndd->dev, "duplicate entry for uuid\n");
1822 return false;
1823 }
1824 found_uuid = true;
1825 if (nlabel != nd_region->ndr_mappings)
1826 continue;
1827 if (position != pos)
1828 continue;
1829 found = nd_label;
1830 break;
1831 }
1832 if (found)
1833 break;
1834 }
1835 return found != NULL;
1836 }
1837
1838 static int select_pmem_id(struct nd_region *nd_region, u8 *pmem_id)
1839 {
1840 int i;
1841
1842 if (!pmem_id)
1843 return -ENODEV;
1844
1845 for (i = 0; i < nd_region->ndr_mappings; i++) {
1846 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1847 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1848 struct nd_namespace_label *nd_label = NULL;
1849 u64 hw_start, hw_end, pmem_start, pmem_end;
1850 struct nd_label_ent *label_ent;
1851
1852 lockdep_assert_held(&nd_mapping->lock);
1853 list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1854 nd_label = label_ent->label;
1855 if (!nd_label)
1856 continue;
1857 if (memcmp(nd_label->uuid, pmem_id, NSLABEL_UUID_LEN) == 0)
1858 break;
1859 nd_label = NULL;
1860 }
1861
1862 if (!nd_label) {
1863 WARN_ON(1);
1864 return -EINVAL;
1865 }
1866
1867 /*
1868 * Check that this label is compliant with the dpa
1869 * range published in NFIT
1870 */
1871 hw_start = nd_mapping->start;
1872 hw_end = hw_start + nd_mapping->size;
1873 pmem_start = __le64_to_cpu(nd_label->dpa);
1874 pmem_end = pmem_start + __le64_to_cpu(nd_label->rawsize);
1875 if (pmem_start >= hw_start && pmem_start < hw_end
1876 && pmem_end <= hw_end && pmem_end > hw_start)
1877 /* pass */;
1878 else {
1879 dev_dbg(&nd_region->dev, "%s invalid label for %pUb\n",
1880 dev_name(ndd->dev), nd_label->uuid);
1881 return -EINVAL;
1882 }
1883
1884 /* move recently validated label to the front of the list */
1885 list_move(&label_ent->list, &nd_mapping->labels);
1886 }
1887 return 0;
1888 }
1889
1890 /**
1891 * create_namespace_pmem - validate interleave set labelling, retrieve label0
1892 * @nd_region: region with mappings to validate
1893 * @nspm: target namespace to create
1894 * @nd_label: target pmem namespace label to evaluate
1895 */
1896 static struct device *create_namespace_pmem(struct nd_region *nd_region,
1897 struct nd_namespace_index *nsindex,
1898 struct nd_namespace_label *nd_label)
1899 {
1900 u64 cookie = nd_region_interleave_set_cookie(nd_region, nsindex);
1901 u64 altcookie = nd_region_interleave_set_altcookie(nd_region);
1902 struct nd_label_ent *label_ent;
1903 struct nd_namespace_pmem *nspm;
1904 struct nd_mapping *nd_mapping;
1905 resource_size_t size = 0;
1906 struct resource *res;
1907 struct device *dev;
1908 int rc = 0;
1909 u16 i;
1910
1911 if (cookie == 0) {
1912 dev_dbg(&nd_region->dev, "invalid interleave-set-cookie\n");
1913 return ERR_PTR(-ENXIO);
1914 }
1915
1916 if (__le64_to_cpu(nd_label->isetcookie) != cookie) {
1917 dev_dbg(&nd_region->dev, "invalid cookie in label: %pUb\n",
1918 nd_label->uuid);
1919 if (__le64_to_cpu(nd_label->isetcookie) != altcookie)
1920 return ERR_PTR(-EAGAIN);
1921
1922 dev_dbg(&nd_region->dev, "valid altcookie in label: %pUb\n",
1923 nd_label->uuid);
1924 }
1925
1926 nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
1927 if (!nspm)
1928 return ERR_PTR(-ENOMEM);
1929
1930 nspm->id = -1;
1931 dev = &nspm->nsio.common.dev;
1932 dev->type = &namespace_pmem_device_type;
1933 dev->parent = &nd_region->dev;
1934 res = &nspm->nsio.res;
1935 res->name = dev_name(&nd_region->dev);
1936 res->flags = IORESOURCE_MEM;
1937
1938 for (i = 0; i < nd_region->ndr_mappings; i++) {
1939 if (has_uuid_at_pos(nd_region, nd_label->uuid, cookie, i))
1940 continue;
1941 if (has_uuid_at_pos(nd_region, nd_label->uuid, altcookie, i))
1942 continue;
1943 break;
1944 }
1945
1946 if (i < nd_region->ndr_mappings) {
1947 struct nvdimm *nvdimm = nd_region->mapping[i].nvdimm;
1948
1949 /*
1950 * Give up if we don't find an instance of a uuid at each
1951 * position (from 0 to nd_region->ndr_mappings - 1), or if we
1952 * find a dimm with two instances of the same uuid.
1953 */
1954 dev_err(&nd_region->dev, "%s missing label for %pUb\n",
1955 nvdimm_name(nvdimm), nd_label->uuid);
1956 rc = -EINVAL;
1957 goto err;
1958 }
1959
1960 /*
1961 * Fix up each mapping's 'labels' to have the validated pmem label for
1962 * that position at labels[0], and NULL at labels[1]. In the process,
1963 * check that the namespace aligns with interleave-set. We know
1964 * that it does not overlap with any blk namespaces by virtue of
1965 * the dimm being enabled (i.e. nd_label_reserve_dpa()
1966 * succeeded).
1967 */
1968 rc = select_pmem_id(nd_region, nd_label->uuid);
1969 if (rc)
1970 goto err;
1971
1972 /* Calculate total size and populate namespace properties from label0 */
1973 for (i = 0; i < nd_region->ndr_mappings; i++) {
1974 struct nd_namespace_label *label0;
1975 struct nvdimm_drvdata *ndd;
1976
1977 nd_mapping = &nd_region->mapping[i];
1978 label_ent = list_first_entry_or_null(&nd_mapping->labels,
1979 typeof(*label_ent), list);
1980 label0 = label_ent ? label_ent->label : 0;
1981
1982 if (!label0) {
1983 WARN_ON(1);
1984 continue;
1985 }
1986
1987 size += __le64_to_cpu(label0->rawsize);
1988 if (__le16_to_cpu(label0->position) != 0)
1989 continue;
1990 WARN_ON(nspm->alt_name || nspm->uuid);
1991 nspm->alt_name = kmemdup((void __force *) label0->name,
1992 NSLABEL_NAME_LEN, GFP_KERNEL);
1993 nspm->uuid = kmemdup((void __force *) label0->uuid,
1994 NSLABEL_UUID_LEN, GFP_KERNEL);
1995 nspm->lbasize = __le64_to_cpu(label0->lbasize);
1996 ndd = to_ndd(nd_mapping);
1997 if (namespace_label_has(ndd, abstraction_guid))
1998 nspm->nsio.common.claim_class
1999 = to_nvdimm_cclass(&label0->abstraction_guid);
2000
2001 }
2002
2003 if (!nspm->alt_name || !nspm->uuid) {
2004 rc = -ENOMEM;
2005 goto err;
2006 }
2007
2008 nd_namespace_pmem_set_resource(nd_region, nspm, size);
2009
2010 return dev;
2011 err:
2012 namespace_pmem_release(dev);
2013 switch (rc) {
2014 case -EINVAL:
2015 dev_dbg(&nd_region->dev, "invalid label(s)\n");
2016 break;
2017 case -ENODEV:
2018 dev_dbg(&nd_region->dev, "label not found\n");
2019 break;
2020 default:
2021 dev_dbg(&nd_region->dev, "unexpected err: %d\n", rc);
2022 break;
2023 }
2024 return ERR_PTR(rc);
2025 }
2026
2027 struct resource *nsblk_add_resource(struct nd_region *nd_region,
2028 struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk,
2029 resource_size_t start)
2030 {
2031 struct nd_label_id label_id;
2032 struct resource *res;
2033
2034 nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
2035 res = krealloc(nsblk->res,
2036 sizeof(void *) * (nsblk->num_resources + 1),
2037 GFP_KERNEL);
2038 if (!res)
2039 return NULL;
2040 nsblk->res = (struct resource **) res;
2041 for_each_dpa_resource(ndd, res)
2042 if (strcmp(res->name, label_id.id) == 0
2043 && res->start == start) {
2044 nsblk->res[nsblk->num_resources++] = res;
2045 return res;
2046 }
2047 return NULL;
2048 }
2049
2050 static struct device *nd_namespace_blk_create(struct nd_region *nd_region)
2051 {
2052 struct nd_namespace_blk *nsblk;
2053 struct device *dev;
2054
2055 if (!is_nd_blk(&nd_region->dev))
2056 return NULL;
2057
2058 nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2059 if (!nsblk)
2060 return NULL;
2061
2062 dev = &nsblk->common.dev;
2063 dev->type = &namespace_blk_device_type;
2064 nsblk->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
2065 if (nsblk->id < 0) {
2066 kfree(nsblk);
2067 return NULL;
2068 }
2069 dev_set_name(dev, "namespace%d.%d", nd_region->id, nsblk->id);
2070 dev->parent = &nd_region->dev;
2071 dev->groups = nd_namespace_attribute_groups;
2072
2073 return &nsblk->common.dev;
2074 }
2075
2076 static struct device *nd_namespace_pmem_create(struct nd_region *nd_region)
2077 {
2078 struct nd_namespace_pmem *nspm;
2079 struct resource *res;
2080 struct device *dev;
2081
2082 if (!is_memory(&nd_region->dev))
2083 return NULL;
2084
2085 nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
2086 if (!nspm)
2087 return NULL;
2088
2089 dev = &nspm->nsio.common.dev;
2090 dev->type = &namespace_pmem_device_type;
2091 dev->parent = &nd_region->dev;
2092 res = &nspm->nsio.res;
2093 res->name = dev_name(&nd_region->dev);
2094 res->flags = IORESOURCE_MEM;
2095
2096 nspm->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
2097 if (nspm->id < 0) {
2098 kfree(nspm);
2099 return NULL;
2100 }
2101 dev_set_name(dev, "namespace%d.%d", nd_region->id, nspm->id);
2102 dev->groups = nd_namespace_attribute_groups;
2103 nd_namespace_pmem_set_resource(nd_region, nspm, 0);
2104
2105 return dev;
2106 }
2107
2108 void nd_region_create_ns_seed(struct nd_region *nd_region)
2109 {
2110 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2111
2112 if (nd_region_to_nstype(nd_region) == ND_DEVICE_NAMESPACE_IO)
2113 return;
2114
2115 if (is_nd_blk(&nd_region->dev))
2116 nd_region->ns_seed = nd_namespace_blk_create(nd_region);
2117 else
2118 nd_region->ns_seed = nd_namespace_pmem_create(nd_region);
2119
2120 /*
2121 * Seed creation failures are not fatal, provisioning is simply
2122 * disabled until memory becomes available
2123 */
2124 if (!nd_region->ns_seed)
2125 dev_err(&nd_region->dev, "failed to create %s namespace\n",
2126 is_nd_blk(&nd_region->dev) ? "blk" : "pmem");
2127 else
2128 nd_device_register(nd_region->ns_seed);
2129 }
2130
2131 void nd_region_create_dax_seed(struct nd_region *nd_region)
2132 {
2133 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2134 nd_region->dax_seed = nd_dax_create(nd_region);
2135 /*
2136 * Seed creation failures are not fatal, provisioning is simply
2137 * disabled until memory becomes available
2138 */
2139 if (!nd_region->dax_seed)
2140 dev_err(&nd_region->dev, "failed to create dax namespace\n");
2141 }
2142
2143 void nd_region_create_pfn_seed(struct nd_region *nd_region)
2144 {
2145 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2146 nd_region->pfn_seed = nd_pfn_create(nd_region);
2147 /*
2148 * Seed creation failures are not fatal, provisioning is simply
2149 * disabled until memory becomes available
2150 */
2151 if (!nd_region->pfn_seed)
2152 dev_err(&nd_region->dev, "failed to create pfn namespace\n");
2153 }
2154
2155 void nd_region_create_btt_seed(struct nd_region *nd_region)
2156 {
2157 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2158 nd_region->btt_seed = nd_btt_create(nd_region);
2159 /*
2160 * Seed creation failures are not fatal, provisioning is simply
2161 * disabled until memory becomes available
2162 */
2163 if (!nd_region->btt_seed)
2164 dev_err(&nd_region->dev, "failed to create btt namespace\n");
2165 }
2166
2167 static int add_namespace_resource(struct nd_region *nd_region,
2168 struct nd_namespace_label *nd_label, struct device **devs,
2169 int count)
2170 {
2171 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2172 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2173 int i;
2174
2175 for (i = 0; i < count; i++) {
2176 u8 *uuid = namespace_to_uuid(devs[i]);
2177 struct resource *res;
2178
2179 if (IS_ERR_OR_NULL(uuid)) {
2180 WARN_ON(1);
2181 continue;
2182 }
2183
2184 if (memcmp(uuid, nd_label->uuid, NSLABEL_UUID_LEN) != 0)
2185 continue;
2186 if (is_namespace_blk(devs[i])) {
2187 res = nsblk_add_resource(nd_region, ndd,
2188 to_nd_namespace_blk(devs[i]),
2189 __le64_to_cpu(nd_label->dpa));
2190 if (!res)
2191 return -ENXIO;
2192 nd_dbg_dpa(nd_region, ndd, res, "%d assign\n", count);
2193 } else {
2194 dev_err(&nd_region->dev,
2195 "error: conflicting extents for uuid: %pUb\n",
2196 nd_label->uuid);
2197 return -ENXIO;
2198 }
2199 break;
2200 }
2201
2202 return i;
2203 }
2204
2205 static struct device *create_namespace_blk(struct nd_region *nd_region,
2206 struct nd_namespace_label *nd_label, int count)
2207 {
2208
2209 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2210 struct nd_interleave_set *nd_set = nd_region->nd_set;
2211 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2212 struct nd_namespace_blk *nsblk;
2213 char name[NSLABEL_NAME_LEN];
2214 struct device *dev = NULL;
2215 struct resource *res;
2216
2217 if (namespace_label_has(ndd, type_guid)) {
2218 if (!guid_equal(&nd_set->type_guid, &nd_label->type_guid)) {
2219 dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n",
2220 nd_set->type_guid.b,
2221 nd_label->type_guid.b);
2222 return ERR_PTR(-EAGAIN);
2223 }
2224
2225 if (nd_label->isetcookie != __cpu_to_le64(nd_set->cookie2)) {
2226 dev_dbg(ndd->dev, "expect cookie %#llx got %#llx\n",
2227 nd_set->cookie2,
2228 __le64_to_cpu(nd_label->isetcookie));
2229 return ERR_PTR(-EAGAIN);
2230 }
2231 }
2232
2233 nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2234 if (!nsblk)
2235 return ERR_PTR(-ENOMEM);
2236 dev = &nsblk->common.dev;
2237 dev->type = &namespace_blk_device_type;
2238 dev->parent = &nd_region->dev;
2239 nsblk->id = -1;
2240 nsblk->lbasize = __le64_to_cpu(nd_label->lbasize);
2241 nsblk->uuid = kmemdup(nd_label->uuid, NSLABEL_UUID_LEN,
2242 GFP_KERNEL);
2243 if (namespace_label_has(ndd, abstraction_guid))
2244 nsblk->common.claim_class
2245 = to_nvdimm_cclass(&nd_label->abstraction_guid);
2246 if (!nsblk->uuid)
2247 goto blk_err;
2248 memcpy(name, nd_label->name, NSLABEL_NAME_LEN);
2249 if (name[0])
2250 nsblk->alt_name = kmemdup(name, NSLABEL_NAME_LEN,
2251 GFP_KERNEL);
2252 res = nsblk_add_resource(nd_region, ndd, nsblk,
2253 __le64_to_cpu(nd_label->dpa));
2254 if (!res)
2255 goto blk_err;
2256 nd_dbg_dpa(nd_region, ndd, res, "%d: assign\n", count);
2257 return dev;
2258 blk_err:
2259 namespace_blk_release(dev);
2260 return ERR_PTR(-ENXIO);
2261 }
2262
2263 static int cmp_dpa(const void *a, const void *b)
2264 {
2265 const struct device *dev_a = *(const struct device **) a;
2266 const struct device *dev_b = *(const struct device **) b;
2267 struct nd_namespace_blk *nsblk_a, *nsblk_b;
2268 struct nd_namespace_pmem *nspm_a, *nspm_b;
2269
2270 if (is_namespace_io(dev_a))
2271 return 0;
2272
2273 if (is_namespace_blk(dev_a)) {
2274 nsblk_a = to_nd_namespace_blk(dev_a);
2275 nsblk_b = to_nd_namespace_blk(dev_b);
2276
2277 return memcmp(&nsblk_a->res[0]->start, &nsblk_b->res[0]->start,
2278 sizeof(resource_size_t));
2279 }
2280
2281 nspm_a = to_nd_namespace_pmem(dev_a);
2282 nspm_b = to_nd_namespace_pmem(dev_b);
2283
2284 return memcmp(&nspm_a->nsio.res.start, &nspm_b->nsio.res.start,
2285 sizeof(resource_size_t));
2286 }
2287
2288 static struct device **scan_labels(struct nd_region *nd_region)
2289 {
2290 int i, count = 0;
2291 struct device *dev, **devs = NULL;
2292 struct nd_label_ent *label_ent, *e;
2293 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2294 resource_size_t map_end = nd_mapping->start + nd_mapping->size - 1;
2295
2296 /* "safe" because create_namespace_pmem() might list_move() label_ent */
2297 list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
2298 struct nd_namespace_label *nd_label = label_ent->label;
2299 struct device **__devs;
2300 u32 flags;
2301
2302 if (!nd_label)
2303 continue;
2304 flags = __le32_to_cpu(nd_label->flags);
2305 if (is_nd_blk(&nd_region->dev)
2306 == !!(flags & NSLABEL_FLAG_LOCAL))
2307 /* pass, region matches label type */;
2308 else
2309 continue;
2310
2311 /* skip labels that describe extents outside of the region */
2312 if (nd_label->dpa < nd_mapping->start || nd_label->dpa > map_end)
2313 continue;
2314
2315 i = add_namespace_resource(nd_region, nd_label, devs, count);
2316 if (i < 0)
2317 goto err;
2318 if (i < count)
2319 continue;
2320 __devs = kcalloc(count + 2, sizeof(dev), GFP_KERNEL);
2321 if (!__devs)
2322 goto err;
2323 memcpy(__devs, devs, sizeof(dev) * count);
2324 kfree(devs);
2325 devs = __devs;
2326
2327 if (is_nd_blk(&nd_region->dev))
2328 dev = create_namespace_blk(nd_region, nd_label, count);
2329 else {
2330 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2331 struct nd_namespace_index *nsindex;
2332
2333 nsindex = to_namespace_index(ndd, ndd->ns_current);
2334 dev = create_namespace_pmem(nd_region, nsindex, nd_label);
2335 }
2336
2337 if (IS_ERR(dev)) {
2338 switch (PTR_ERR(dev)) {
2339 case -EAGAIN:
2340 /* skip invalid labels */
2341 continue;
2342 case -ENODEV:
2343 /* fallthrough to seed creation */
2344 break;
2345 default:
2346 goto err;
2347 }
2348 } else
2349 devs[count++] = dev;
2350
2351 }
2352
2353 dev_dbg(&nd_region->dev, "discovered %d %s namespace%s\n",
2354 count, is_nd_blk(&nd_region->dev)
2355 ? "blk" : "pmem", count == 1 ? "" : "s");
2356
2357 if (count == 0) {
2358 /* Publish a zero-sized namespace for userspace to configure. */
2359 nd_mapping_free_labels(nd_mapping);
2360
2361 devs = kcalloc(2, sizeof(dev), GFP_KERNEL);
2362 if (!devs)
2363 goto err;
2364 if (is_nd_blk(&nd_region->dev)) {
2365 struct nd_namespace_blk *nsblk;
2366
2367 nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2368 if (!nsblk)
2369 goto err;
2370 dev = &nsblk->common.dev;
2371 dev->type = &namespace_blk_device_type;
2372 } else {
2373 struct nd_namespace_pmem *nspm;
2374
2375 nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
2376 if (!nspm)
2377 goto err;
2378 dev = &nspm->nsio.common.dev;
2379 dev->type = &namespace_pmem_device_type;
2380 nd_namespace_pmem_set_resource(nd_region, nspm, 0);
2381 }
2382 dev->parent = &nd_region->dev;
2383 devs[count++] = dev;
2384 } else if (is_memory(&nd_region->dev)) {
2385 /* clean unselected labels */
2386 for (i = 0; i < nd_region->ndr_mappings; i++) {
2387 struct list_head *l, *e;
2388 LIST_HEAD(list);
2389 int j;
2390
2391 nd_mapping = &nd_region->mapping[i];
2392 if (list_empty(&nd_mapping->labels)) {
2393 WARN_ON(1);
2394 continue;
2395 }
2396
2397 j = count;
2398 list_for_each_safe(l, e, &nd_mapping->labels) {
2399 if (!j--)
2400 break;
2401 list_move_tail(l, &list);
2402 }
2403 nd_mapping_free_labels(nd_mapping);
2404 list_splice_init(&list, &nd_mapping->labels);
2405 }
2406 }
2407
2408 if (count > 1)
2409 sort(devs, count, sizeof(struct device *), cmp_dpa, NULL);
2410
2411 return devs;
2412
2413 err:
2414 if (devs) {
2415 for (i = 0; devs[i]; i++)
2416 if (is_nd_blk(&nd_region->dev))
2417 namespace_blk_release(devs[i]);
2418 else
2419 namespace_pmem_release(devs[i]);
2420 kfree(devs);
2421 }
2422 return NULL;
2423 }
2424
2425 static struct device **create_namespaces(struct nd_region *nd_region)
2426 {
2427 struct nd_mapping *nd_mapping;
2428 struct device **devs;
2429 int i;
2430
2431 if (nd_region->ndr_mappings == 0)
2432 return NULL;
2433
2434 /* lock down all mappings while we scan labels */
2435 for (i = 0; i < nd_region->ndr_mappings; i++) {
2436 nd_mapping = &nd_region->mapping[i];
2437 mutex_lock_nested(&nd_mapping->lock, i);
2438 }
2439
2440 devs = scan_labels(nd_region);
2441
2442 for (i = 0; i < nd_region->ndr_mappings; i++) {
2443 int reverse = nd_region->ndr_mappings - 1 - i;
2444
2445 nd_mapping = &nd_region->mapping[reverse];
2446 mutex_unlock(&nd_mapping->lock);
2447 }
2448
2449 return devs;
2450 }
2451
2452 static int init_active_labels(struct nd_region *nd_region)
2453 {
2454 int i;
2455
2456 for (i = 0; i < nd_region->ndr_mappings; i++) {
2457 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
2458 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2459 struct nvdimm *nvdimm = nd_mapping->nvdimm;
2460 struct nd_label_ent *label_ent;
2461 int count, j;
2462
2463 /*
2464 * If the dimm is disabled then we may need to prevent
2465 * the region from being activated.
2466 */
2467 if (!ndd) {
2468 if (test_bit(NDD_LOCKED, &nvdimm->flags))
2469 /* fail, label data may be unreadable */;
2470 else if (test_bit(NDD_ALIASING, &nvdimm->flags))
2471 /* fail, labels needed to disambiguate dpa */;
2472 else
2473 return 0;
2474
2475 dev_err(&nd_region->dev, "%s: is %s, failing probe\n",
2476 dev_name(&nd_mapping->nvdimm->dev),
2477 test_bit(NDD_LOCKED, &nvdimm->flags)
2478 ? "locked" : "disabled");
2479 return -ENXIO;
2480 }
2481 nd_mapping->ndd = ndd;
2482 atomic_inc(&nvdimm->busy);
2483 get_ndd(ndd);
2484
2485 count = nd_label_active_count(ndd);
2486 dev_dbg(ndd->dev, "count: %d\n", count);
2487 if (!count)
2488 continue;
2489 for (j = 0; j < count; j++) {
2490 struct nd_namespace_label *label;
2491
2492 label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL);
2493 if (!label_ent)
2494 break;
2495 label = nd_label_active(ndd, j);
2496 label_ent->label = label;
2497
2498 mutex_lock(&nd_mapping->lock);
2499 list_add_tail(&label_ent->list, &nd_mapping->labels);
2500 mutex_unlock(&nd_mapping->lock);
2501 }
2502
2503 if (j >= count)
2504 continue;
2505
2506 mutex_lock(&nd_mapping->lock);
2507 nd_mapping_free_labels(nd_mapping);
2508 mutex_unlock(&nd_mapping->lock);
2509 return -ENOMEM;
2510 }
2511
2512 return 0;
2513 }
2514
2515 int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
2516 {
2517 struct device **devs = NULL;
2518 int i, rc = 0, type;
2519
2520 *err = 0;
2521 nvdimm_bus_lock(&nd_region->dev);
2522 rc = init_active_labels(nd_region);
2523 if (rc) {
2524 nvdimm_bus_unlock(&nd_region->dev);
2525 return rc;
2526 }
2527
2528 type = nd_region_to_nstype(nd_region);
2529 switch (type) {
2530 case ND_DEVICE_NAMESPACE_IO:
2531 devs = create_namespace_io(nd_region);
2532 break;
2533 case ND_DEVICE_NAMESPACE_PMEM:
2534 case ND_DEVICE_NAMESPACE_BLK:
2535 devs = create_namespaces(nd_region);
2536 break;
2537 default:
2538 break;
2539 }
2540 nvdimm_bus_unlock(&nd_region->dev);
2541
2542 if (!devs)
2543 return -ENODEV;
2544
2545 for (i = 0; devs[i]; i++) {
2546 struct device *dev = devs[i];
2547 int id;
2548
2549 if (type == ND_DEVICE_NAMESPACE_BLK) {
2550 struct nd_namespace_blk *nsblk;
2551
2552 nsblk = to_nd_namespace_blk(dev);
2553 id = ida_simple_get(&nd_region->ns_ida, 0, 0,
2554 GFP_KERNEL);
2555 nsblk->id = id;
2556 } else if (type == ND_DEVICE_NAMESPACE_PMEM) {
2557 struct nd_namespace_pmem *nspm;
2558
2559 nspm = to_nd_namespace_pmem(dev);
2560 id = ida_simple_get(&nd_region->ns_ida, 0, 0,
2561 GFP_KERNEL);
2562 nspm->id = id;
2563 } else
2564 id = i;
2565
2566 if (id < 0)
2567 break;
2568 dev_set_name(dev, "namespace%d.%d", nd_region->id, id);
2569 dev->groups = nd_namespace_attribute_groups;
2570 nd_device_register(dev);
2571 }
2572 if (i)
2573 nd_region->ns_seed = devs[0];
2574
2575 if (devs[i]) {
2576 int j;
2577
2578 for (j = i; devs[j]; j++) {
2579 struct device *dev = devs[j];
2580
2581 device_initialize(dev);
2582 put_device(dev);
2583 }
2584 *err = j - i;
2585 /*
2586 * All of the namespaces we tried to register failed, so
2587 * fail region activation.
2588 */
2589 if (*err == 0)
2590 rc = -ENODEV;
2591 }
2592 kfree(devs);
2593
2594 if (rc == -ENODEV)
2595 return rc;
2596
2597 return i;
2598 }
Linux with added FPC-III support