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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma
[deliverable/linux.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/slab.h>
16 #include <linux/pmem.h>
17 #include <linux/nd.h>
18 #include "nd-core.h"
19 #include "nd.h"
20
21 static void namespace_io_release(struct device *dev)
22 {
23 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
24
25 kfree(nsio);
26 }
27
28 static void namespace_pmem_release(struct device *dev)
29 {
30 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
31
32 kfree(nspm->alt_name);
33 kfree(nspm->uuid);
34 kfree(nspm);
35 }
36
37 static void namespace_blk_release(struct device *dev)
38 {
39 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
40 struct nd_region *nd_region = to_nd_region(dev->parent);
41
42 if (nsblk->id >= 0)
43 ida_simple_remove(&nd_region->ns_ida, nsblk->id);
44 kfree(nsblk->alt_name);
45 kfree(nsblk->uuid);
46 kfree(nsblk->res);
47 kfree(nsblk);
48 }
49
50 static struct device_type namespace_io_device_type = {
51 .name = "nd_namespace_io",
52 .release = namespace_io_release,
53 };
54
55 static struct device_type namespace_pmem_device_type = {
56 .name = "nd_namespace_pmem",
57 .release = namespace_pmem_release,
58 };
59
60 static struct device_type namespace_blk_device_type = {
61 .name = "nd_namespace_blk",
62 .release = namespace_blk_release,
63 };
64
65 static bool is_namespace_pmem(struct device *dev)
66 {
67 return dev ? dev->type == &namespace_pmem_device_type : false;
68 }
69
70 static bool is_namespace_blk(struct device *dev)
71 {
72 return dev ? dev->type == &namespace_blk_device_type : false;
73 }
74
75 static bool is_namespace_io(struct device *dev)
76 {
77 return dev ? dev->type == &namespace_io_device_type : false;
78 }
79
80 bool pmem_should_map_pages(struct device *dev)
81 {
82 struct nd_region *nd_region = to_nd_region(dev->parent);
83
84 if (!IS_ENABLED(CONFIG_ZONE_DEVICE))
85 return false;
86
87 if (!test_bit(ND_REGION_PAGEMAP, &nd_region->flags))
88 return false;
89
90 if (is_nd_pfn(dev) || is_nd_btt(dev))
91 return false;
92
93 #ifdef ARCH_MEMREMAP_PMEM
94 return ARCH_MEMREMAP_PMEM == MEMREMAP_WB;
95 #else
96 return false;
97 #endif
98 }
99 EXPORT_SYMBOL(pmem_should_map_pages);
100
101 const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
102 char *name)
103 {
104 struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
105 const char *suffix = NULL;
106
107 if (ndns->claim) {
108 if (is_nd_btt(ndns->claim))
109 suffix = "s";
110 else if (is_nd_pfn(ndns->claim))
111 suffix = "m";
112 else
113 dev_WARN_ONCE(&ndns->dev, 1,
114 "unknown claim type by %s\n",
115 dev_name(ndns->claim));
116 }
117
118 if (is_namespace_pmem(&ndns->dev) || is_namespace_io(&ndns->dev)) {
119 if (!suffix && pmem_should_map_pages(&ndns->dev))
120 suffix = "m";
121 sprintf(name, "pmem%d%s", nd_region->id, suffix ? suffix : "");
122 } else if (is_namespace_blk(&ndns->dev)) {
123 struct nd_namespace_blk *nsblk;
124
125 nsblk = to_nd_namespace_blk(&ndns->dev);
126 sprintf(name, "ndblk%d.%d%s", nd_region->id, nsblk->id,
127 suffix ? suffix : "");
128 } else {
129 return NULL;
130 }
131
132 return name;
133 }
134 EXPORT_SYMBOL(nvdimm_namespace_disk_name);
135
136 const u8 *nd_dev_to_uuid(struct device *dev)
137 {
138 static const u8 null_uuid[16];
139
140 if (!dev)
141 return null_uuid;
142
143 if (is_namespace_pmem(dev)) {
144 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
145
146 return nspm->uuid;
147 } else if (is_namespace_blk(dev)) {
148 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
149
150 return nsblk->uuid;
151 } else
152 return null_uuid;
153 }
154 EXPORT_SYMBOL(nd_dev_to_uuid);
155
156 static ssize_t nstype_show(struct device *dev,
157 struct device_attribute *attr, char *buf)
158 {
159 struct nd_region *nd_region = to_nd_region(dev->parent);
160
161 return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region));
162 }
163 static DEVICE_ATTR_RO(nstype);
164
165 static ssize_t __alt_name_store(struct device *dev, const char *buf,
166 const size_t len)
167 {
168 char *input, *pos, *alt_name, **ns_altname;
169 ssize_t rc;
170
171 if (is_namespace_pmem(dev)) {
172 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
173
174 ns_altname = &nspm->alt_name;
175 } else if (is_namespace_blk(dev)) {
176 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
177
178 ns_altname = &nsblk->alt_name;
179 } else
180 return -ENXIO;
181
182 if (dev->driver || to_ndns(dev)->claim)
183 return -EBUSY;
184
185 input = kmemdup(buf, len + 1, GFP_KERNEL);
186 if (!input)
187 return -ENOMEM;
188
189 input[len] = '\0';
190 pos = strim(input);
191 if (strlen(pos) + 1 > NSLABEL_NAME_LEN) {
192 rc = -EINVAL;
193 goto out;
194 }
195
196 alt_name = kzalloc(NSLABEL_NAME_LEN, GFP_KERNEL);
197 if (!alt_name) {
198 rc = -ENOMEM;
199 goto out;
200 }
201 kfree(*ns_altname);
202 *ns_altname = alt_name;
203 sprintf(*ns_altname, "%s", pos);
204 rc = len;
205
206 out:
207 kfree(input);
208 return rc;
209 }
210
211 static resource_size_t nd_namespace_blk_size(struct nd_namespace_blk *nsblk)
212 {
213 struct nd_region *nd_region = to_nd_region(nsblk->common.dev.parent);
214 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
215 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
216 struct nd_label_id label_id;
217 resource_size_t size = 0;
218 struct resource *res;
219
220 if (!nsblk->uuid)
221 return 0;
222 nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
223 for_each_dpa_resource(ndd, res)
224 if (strcmp(res->name, label_id.id) == 0)
225 size += resource_size(res);
226 return size;
227 }
228
229 static bool __nd_namespace_blk_validate(struct nd_namespace_blk *nsblk)
230 {
231 struct nd_region *nd_region = to_nd_region(nsblk->common.dev.parent);
232 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
233 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
234 struct nd_label_id label_id;
235 struct resource *res;
236 int count, i;
237
238 if (!nsblk->uuid || !nsblk->lbasize || !ndd)
239 return false;
240
241 count = 0;
242 nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
243 for_each_dpa_resource(ndd, res) {
244 if (strcmp(res->name, label_id.id) != 0)
245 continue;
246 /*
247 * Resources with unacknoweldged adjustments indicate a
248 * failure to update labels
249 */
250 if (res->flags & DPA_RESOURCE_ADJUSTED)
251 return false;
252 count++;
253 }
254
255 /* These values match after a successful label update */
256 if (count != nsblk->num_resources)
257 return false;
258
259 for (i = 0; i < nsblk->num_resources; i++) {
260 struct resource *found = NULL;
261
262 for_each_dpa_resource(ndd, res)
263 if (res == nsblk->res[i]) {
264 found = res;
265 break;
266 }
267 /* stale resource */
268 if (!found)
269 return false;
270 }
271
272 return true;
273 }
274
275 resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk)
276 {
277 resource_size_t size;
278
279 nvdimm_bus_lock(&nsblk->common.dev);
280 size = __nd_namespace_blk_validate(nsblk);
281 nvdimm_bus_unlock(&nsblk->common.dev);
282
283 return size;
284 }
285 EXPORT_SYMBOL(nd_namespace_blk_validate);
286
287
288 static int nd_namespace_label_update(struct nd_region *nd_region,
289 struct device *dev)
290 {
291 dev_WARN_ONCE(dev, dev->driver || to_ndns(dev)->claim,
292 "namespace must be idle during label update\n");
293 if (dev->driver || to_ndns(dev)->claim)
294 return 0;
295
296 /*
297 * Only allow label writes that will result in a valid namespace
298 * or deletion of an existing namespace.
299 */
300 if (is_namespace_pmem(dev)) {
301 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
302 resource_size_t size = resource_size(&nspm->nsio.res);
303
304 if (size == 0 && nspm->uuid)
305 /* delete allocation */;
306 else if (!nspm->uuid)
307 return 0;
308
309 return nd_pmem_namespace_label_update(nd_region, nspm, size);
310 } else if (is_namespace_blk(dev)) {
311 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
312 resource_size_t size = nd_namespace_blk_size(nsblk);
313
314 if (size == 0 && nsblk->uuid)
315 /* delete allocation */;
316 else if (!nsblk->uuid || !nsblk->lbasize)
317 return 0;
318
319 return nd_blk_namespace_label_update(nd_region, nsblk, size);
320 } else
321 return -ENXIO;
322 }
323
324 static ssize_t alt_name_store(struct device *dev,
325 struct device_attribute *attr, const char *buf, size_t len)
326 {
327 struct nd_region *nd_region = to_nd_region(dev->parent);
328 ssize_t rc;
329
330 device_lock(dev);
331 nvdimm_bus_lock(dev);
332 wait_nvdimm_bus_probe_idle(dev);
333 rc = __alt_name_store(dev, buf, len);
334 if (rc >= 0)
335 rc = nd_namespace_label_update(nd_region, dev);
336 dev_dbg(dev, "%s: %s(%zd)\n", __func__, rc < 0 ? "fail " : "", rc);
337 nvdimm_bus_unlock(dev);
338 device_unlock(dev);
339
340 return rc < 0 ? rc : len;
341 }
342
343 static ssize_t alt_name_show(struct device *dev,
344 struct device_attribute *attr, char *buf)
345 {
346 char *ns_altname;
347
348 if (is_namespace_pmem(dev)) {
349 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
350
351 ns_altname = nspm->alt_name;
352 } else if (is_namespace_blk(dev)) {
353 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
354
355 ns_altname = nsblk->alt_name;
356 } else
357 return -ENXIO;
358
359 return sprintf(buf, "%s\n", ns_altname ? ns_altname : "");
360 }
361 static DEVICE_ATTR_RW(alt_name);
362
363 static int scan_free(struct nd_region *nd_region,
364 struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
365 resource_size_t n)
366 {
367 bool is_blk = strncmp(label_id->id, "blk", 3) == 0;
368 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
369 int rc = 0;
370
371 while (n) {
372 struct resource *res, *last;
373 resource_size_t new_start;
374
375 last = NULL;
376 for_each_dpa_resource(ndd, res)
377 if (strcmp(res->name, label_id->id) == 0)
378 last = res;
379 res = last;
380 if (!res)
381 return 0;
382
383 if (n >= resource_size(res)) {
384 n -= resource_size(res);
385 nd_dbg_dpa(nd_region, ndd, res, "delete %d\n", rc);
386 nvdimm_free_dpa(ndd, res);
387 /* retry with last resource deleted */
388 continue;
389 }
390
391 /*
392 * Keep BLK allocations relegated to high DPA as much as
393 * possible
394 */
395 if (is_blk)
396 new_start = res->start + n;
397 else
398 new_start = res->start;
399
400 rc = adjust_resource(res, new_start, resource_size(res) - n);
401 if (rc == 0)
402 res->flags |= DPA_RESOURCE_ADJUSTED;
403 nd_dbg_dpa(nd_region, ndd, res, "shrink %d\n", rc);
404 break;
405 }
406
407 return rc;
408 }
409
410 /**
411 * shrink_dpa_allocation - for each dimm in region free n bytes for label_id
412 * @nd_region: the set of dimms to reclaim @n bytes from
413 * @label_id: unique identifier for the namespace consuming this dpa range
414 * @n: number of bytes per-dimm to release
415 *
416 * Assumes resources are ordered. Starting from the end try to
417 * adjust_resource() the allocation to @n, but if @n is larger than the
418 * allocation delete it and find the 'new' last allocation in the label
419 * set.
420 */
421 static int shrink_dpa_allocation(struct nd_region *nd_region,
422 struct nd_label_id *label_id, resource_size_t n)
423 {
424 int i;
425
426 for (i = 0; i < nd_region->ndr_mappings; i++) {
427 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
428 int rc;
429
430 rc = scan_free(nd_region, nd_mapping, label_id, n);
431 if (rc)
432 return rc;
433 }
434
435 return 0;
436 }
437
438 static resource_size_t init_dpa_allocation(struct nd_label_id *label_id,
439 struct nd_region *nd_region, struct nd_mapping *nd_mapping,
440 resource_size_t n)
441 {
442 bool is_blk = strncmp(label_id->id, "blk", 3) == 0;
443 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
444 resource_size_t first_dpa;
445 struct resource *res;
446 int rc = 0;
447
448 /* allocate blk from highest dpa first */
449 if (is_blk)
450 first_dpa = nd_mapping->start + nd_mapping->size - n;
451 else
452 first_dpa = nd_mapping->start;
453
454 /* first resource allocation for this label-id or dimm */
455 res = nvdimm_allocate_dpa(ndd, label_id, first_dpa, n);
456 if (!res)
457 rc = -EBUSY;
458
459 nd_dbg_dpa(nd_region, ndd, res, "init %d\n", rc);
460 return rc ? n : 0;
461 }
462
463 static bool space_valid(bool is_pmem, bool is_reserve,
464 struct nd_label_id *label_id, struct resource *res)
465 {
466 /*
467 * For BLK-space any space is valid, for PMEM-space, it must be
468 * contiguous with an existing allocation unless we are
469 * reserving pmem.
470 */
471 if (is_reserve || !is_pmem)
472 return true;
473 if (!res || strcmp(res->name, label_id->id) == 0)
474 return true;
475 return false;
476 }
477
478 enum alloc_loc {
479 ALLOC_ERR = 0, ALLOC_BEFORE, ALLOC_MID, ALLOC_AFTER,
480 };
481
482 static resource_size_t scan_allocate(struct nd_region *nd_region,
483 struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
484 resource_size_t n)
485 {
486 resource_size_t mapping_end = nd_mapping->start + nd_mapping->size - 1;
487 bool is_reserve = strcmp(label_id->id, "pmem-reserve") == 0;
488 bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
489 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
490 const resource_size_t to_allocate = n;
491 struct resource *res;
492 int first;
493
494 retry:
495 first = 0;
496 for_each_dpa_resource(ndd, res) {
497 resource_size_t allocate, available = 0, free_start, free_end;
498 struct resource *next = res->sibling, *new_res = NULL;
499 enum alloc_loc loc = ALLOC_ERR;
500 const char *action;
501 int rc = 0;
502
503 /* ignore resources outside this nd_mapping */
504 if (res->start > mapping_end)
505 continue;
506 if (res->end < nd_mapping->start)
507 continue;
508
509 /* space at the beginning of the mapping */
510 if (!first++ && res->start > nd_mapping->start) {
511 free_start = nd_mapping->start;
512 available = res->start - free_start;
513 if (space_valid(is_pmem, is_reserve, label_id, NULL))
514 loc = ALLOC_BEFORE;
515 }
516
517 /* space between allocations */
518 if (!loc && next) {
519 free_start = res->start + resource_size(res);
520 free_end = min(mapping_end, next->start - 1);
521 if (space_valid(is_pmem, is_reserve, label_id, res)
522 && free_start < free_end) {
523 available = free_end + 1 - free_start;
524 loc = ALLOC_MID;
525 }
526 }
527
528 /* space at the end of the mapping */
529 if (!loc && !next) {
530 free_start = res->start + resource_size(res);
531 free_end = mapping_end;
532 if (space_valid(is_pmem, is_reserve, label_id, res)
533 && free_start < free_end) {
534 available = free_end + 1 - free_start;
535 loc = ALLOC_AFTER;
536 }
537 }
538
539 if (!loc || !available)
540 continue;
541 allocate = min(available, n);
542 switch (loc) {
543 case ALLOC_BEFORE:
544 if (strcmp(res->name, label_id->id) == 0) {
545 /* adjust current resource up */
546 if (is_pmem && !is_reserve)
547 return n;
548 rc = adjust_resource(res, res->start - allocate,
549 resource_size(res) + allocate);
550 action = "cur grow up";
551 } else
552 action = "allocate";
553 break;
554 case ALLOC_MID:
555 if (strcmp(next->name, label_id->id) == 0) {
556 /* adjust next resource up */
557 if (is_pmem && !is_reserve)
558 return n;
559 rc = adjust_resource(next, next->start
560 - allocate, resource_size(next)
561 + allocate);
562 new_res = next;
563 action = "next grow up";
564 } else if (strcmp(res->name, label_id->id) == 0) {
565 action = "grow down";
566 } else
567 action = "allocate";
568 break;
569 case ALLOC_AFTER:
570 if (strcmp(res->name, label_id->id) == 0)
571 action = "grow down";
572 else
573 action = "allocate";
574 break;
575 default:
576 return n;
577 }
578
579 if (strcmp(action, "allocate") == 0) {
580 /* BLK allocate bottom up */
581 if (!is_pmem)
582 free_start += available - allocate;
583 else if (!is_reserve && free_start != nd_mapping->start)
584 return n;
585
586 new_res = nvdimm_allocate_dpa(ndd, label_id,
587 free_start, allocate);
588 if (!new_res)
589 rc = -EBUSY;
590 } else if (strcmp(action, "grow down") == 0) {
591 /* adjust current resource down */
592 rc = adjust_resource(res, res->start, resource_size(res)
593 + allocate);
594 if (rc == 0)
595 res->flags |= DPA_RESOURCE_ADJUSTED;
596 }
597
598 if (!new_res)
599 new_res = res;
600
601 nd_dbg_dpa(nd_region, ndd, new_res, "%s(%d) %d\n",
602 action, loc, rc);
603
604 if (rc)
605 return n;
606
607 n -= allocate;
608 if (n) {
609 /*
610 * Retry scan with newly inserted resources.
611 * For example, if we did an ALLOC_BEFORE
612 * insertion there may also have been space
613 * available for an ALLOC_AFTER insertion, so we
614 * need to check this same resource again
615 */
616 goto retry;
617 } else
618 return 0;
619 }
620
621 /*
622 * If we allocated nothing in the BLK case it may be because we are in
623 * an initial "pmem-reserve pass". Only do an initial BLK allocation
624 * when none of the DPA space is reserved.
625 */
626 if ((is_pmem || !ndd->dpa.child) && n == to_allocate)
627 return init_dpa_allocation(label_id, nd_region, nd_mapping, n);
628 return n;
629 }
630
631 static int merge_dpa(struct nd_region *nd_region,
632 struct nd_mapping *nd_mapping, struct nd_label_id *label_id)
633 {
634 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
635 struct resource *res;
636
637 if (strncmp("pmem", label_id->id, 4) == 0)
638 return 0;
639 retry:
640 for_each_dpa_resource(ndd, res) {
641 int rc;
642 struct resource *next = res->sibling;
643 resource_size_t end = res->start + resource_size(res);
644
645 if (!next || strcmp(res->name, label_id->id) != 0
646 || strcmp(next->name, label_id->id) != 0
647 || end != next->start)
648 continue;
649 end += resource_size(next);
650 nvdimm_free_dpa(ndd, next);
651 rc = adjust_resource(res, res->start, end - res->start);
652 nd_dbg_dpa(nd_region, ndd, res, "merge %d\n", rc);
653 if (rc)
654 return rc;
655 res->flags |= DPA_RESOURCE_ADJUSTED;
656 goto retry;
657 }
658
659 return 0;
660 }
661
662 static int __reserve_free_pmem(struct device *dev, void *data)
663 {
664 struct nvdimm *nvdimm = data;
665 struct nd_region *nd_region;
666 struct nd_label_id label_id;
667 int i;
668
669 if (!is_nd_pmem(dev))
670 return 0;
671
672 nd_region = to_nd_region(dev);
673 if (nd_region->ndr_mappings == 0)
674 return 0;
675
676 memset(&label_id, 0, sizeof(label_id));
677 strcat(label_id.id, "pmem-reserve");
678 for (i = 0; i < nd_region->ndr_mappings; i++) {
679 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
680 resource_size_t n, rem = 0;
681
682 if (nd_mapping->nvdimm != nvdimm)
683 continue;
684
685 n = nd_pmem_available_dpa(nd_region, nd_mapping, &rem);
686 if (n == 0)
687 return 0;
688 rem = scan_allocate(nd_region, nd_mapping, &label_id, n);
689 dev_WARN_ONCE(&nd_region->dev, rem,
690 "pmem reserve underrun: %#llx of %#llx bytes\n",
691 (unsigned long long) n - rem,
692 (unsigned long long) n);
693 return rem ? -ENXIO : 0;
694 }
695
696 return 0;
697 }
698
699 static void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
700 struct nd_mapping *nd_mapping)
701 {
702 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
703 struct resource *res, *_res;
704
705 for_each_dpa_resource_safe(ndd, res, _res)
706 if (strcmp(res->name, "pmem-reserve") == 0)
707 nvdimm_free_dpa(ndd, res);
708 }
709
710 static int reserve_free_pmem(struct nvdimm_bus *nvdimm_bus,
711 struct nd_mapping *nd_mapping)
712 {
713 struct nvdimm *nvdimm = nd_mapping->nvdimm;
714 int rc;
715
716 rc = device_for_each_child(&nvdimm_bus->dev, nvdimm,
717 __reserve_free_pmem);
718 if (rc)
719 release_free_pmem(nvdimm_bus, nd_mapping);
720 return rc;
721 }
722
723 /**
724 * grow_dpa_allocation - for each dimm allocate n bytes for @label_id
725 * @nd_region: the set of dimms to allocate @n more bytes from
726 * @label_id: unique identifier for the namespace consuming this dpa range
727 * @n: number of bytes per-dimm to add to the existing allocation
728 *
729 * Assumes resources are ordered. For BLK regions, first consume
730 * BLK-only available DPA free space, then consume PMEM-aliased DPA
731 * space starting at the highest DPA. For PMEM regions start
732 * allocations from the start of an interleave set and end at the first
733 * BLK allocation or the end of the interleave set, whichever comes
734 * first.
735 */
736 static int grow_dpa_allocation(struct nd_region *nd_region,
737 struct nd_label_id *label_id, resource_size_t n)
738 {
739 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
740 bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
741 int i;
742
743 for (i = 0; i < nd_region->ndr_mappings; i++) {
744 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
745 resource_size_t rem = n;
746 int rc, j;
747
748 /*
749 * In the BLK case try once with all unallocated PMEM
750 * reserved, and once without
751 */
752 for (j = is_pmem; j < 2; j++) {
753 bool blk_only = j == 0;
754
755 if (blk_only) {
756 rc = reserve_free_pmem(nvdimm_bus, nd_mapping);
757 if (rc)
758 return rc;
759 }
760 rem = scan_allocate(nd_region, nd_mapping,
761 label_id, rem);
762 if (blk_only)
763 release_free_pmem(nvdimm_bus, nd_mapping);
764
765 /* try again and allow encroachments into PMEM */
766 if (rem == 0)
767 break;
768 }
769
770 dev_WARN_ONCE(&nd_region->dev, rem,
771 "allocation underrun: %#llx of %#llx bytes\n",
772 (unsigned long long) n - rem,
773 (unsigned long long) n);
774 if (rem)
775 return -ENXIO;
776
777 rc = merge_dpa(nd_region, nd_mapping, label_id);
778 if (rc)
779 return rc;
780 }
781
782 return 0;
783 }
784
785 static void nd_namespace_pmem_set_size(struct nd_region *nd_region,
786 struct nd_namespace_pmem *nspm, resource_size_t size)
787 {
788 struct resource *res = &nspm->nsio.res;
789
790 res->start = nd_region->ndr_start;
791 res->end = nd_region->ndr_start + size - 1;
792 }
793
794 static ssize_t __size_store(struct device *dev, unsigned long long val)
795 {
796 resource_size_t allocated = 0, available = 0;
797 struct nd_region *nd_region = to_nd_region(dev->parent);
798 struct nd_mapping *nd_mapping;
799 struct nvdimm_drvdata *ndd;
800 struct nd_label_id label_id;
801 u32 flags = 0, remainder;
802 u8 *uuid = NULL;
803 int rc, i;
804
805 if (dev->driver || to_ndns(dev)->claim)
806 return -EBUSY;
807
808 if (is_namespace_pmem(dev)) {
809 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
810
811 uuid = nspm->uuid;
812 } else if (is_namespace_blk(dev)) {
813 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
814
815 uuid = nsblk->uuid;
816 flags = NSLABEL_FLAG_LOCAL;
817 }
818
819 /*
820 * We need a uuid for the allocation-label and dimm(s) on which
821 * to store the label.
822 */
823 if (!uuid || nd_region->ndr_mappings == 0)
824 return -ENXIO;
825
826 div_u64_rem(val, SZ_4K * nd_region->ndr_mappings, &remainder);
827 if (remainder) {
828 dev_dbg(dev, "%llu is not %dK aligned\n", val,
829 (SZ_4K * nd_region->ndr_mappings) / SZ_1K);
830 return -EINVAL;
831 }
832
833 nd_label_gen_id(&label_id, uuid, flags);
834 for (i = 0; i < nd_region->ndr_mappings; i++) {
835 nd_mapping = &nd_region->mapping[i];
836 ndd = to_ndd(nd_mapping);
837
838 /*
839 * All dimms in an interleave set, or the base dimm for a blk
840 * region, need to be enabled for the size to be changed.
841 */
842 if (!ndd)
843 return -ENXIO;
844
845 allocated += nvdimm_allocated_dpa(ndd, &label_id);
846 }
847 available = nd_region_available_dpa(nd_region);
848
849 if (val > available + allocated)
850 return -ENOSPC;
851
852 if (val == allocated)
853 return 0;
854
855 val = div_u64(val, nd_region->ndr_mappings);
856 allocated = div_u64(allocated, nd_region->ndr_mappings);
857 if (val < allocated)
858 rc = shrink_dpa_allocation(nd_region, &label_id,
859 allocated - val);
860 else
861 rc = grow_dpa_allocation(nd_region, &label_id, val - allocated);
862
863 if (rc)
864 return rc;
865
866 if (is_namespace_pmem(dev)) {
867 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
868
869 nd_namespace_pmem_set_size(nd_region, nspm,
870 val * nd_region->ndr_mappings);
871 } else if (is_namespace_blk(dev)) {
872 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
873
874 /*
875 * Try to delete the namespace if we deleted all of its
876 * allocation, this is not the seed device for the
877 * region, and it is not actively claimed by a btt
878 * instance.
879 */
880 if (val == 0 && nd_region->ns_seed != dev
881 && !nsblk->common.claim)
882 nd_device_unregister(dev, ND_ASYNC);
883 }
884
885 return rc;
886 }
887
888 static ssize_t size_store(struct device *dev,
889 struct device_attribute *attr, const char *buf, size_t len)
890 {
891 struct nd_region *nd_region = to_nd_region(dev->parent);
892 unsigned long long val;
893 u8 **uuid = NULL;
894 int rc;
895
896 rc = kstrtoull(buf, 0, &val);
897 if (rc)
898 return rc;
899
900 device_lock(dev);
901 nvdimm_bus_lock(dev);
902 wait_nvdimm_bus_probe_idle(dev);
903 rc = __size_store(dev, val);
904 if (rc >= 0)
905 rc = nd_namespace_label_update(nd_region, dev);
906
907 if (is_namespace_pmem(dev)) {
908 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
909
910 uuid = &nspm->uuid;
911 } else if (is_namespace_blk(dev)) {
912 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
913
914 uuid = &nsblk->uuid;
915 }
916
917 if (rc == 0 && val == 0 && uuid) {
918 /* setting size zero == 'delete namespace' */
919 kfree(*uuid);
920 *uuid = NULL;
921 }
922
923 dev_dbg(dev, "%s: %llx %s (%d)\n", __func__, val, rc < 0
924 ? "fail" : "success", rc);
925
926 nvdimm_bus_unlock(dev);
927 device_unlock(dev);
928
929 return rc < 0 ? rc : len;
930 }
931
932 resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
933 {
934 struct device *dev = &ndns->dev;
935
936 if (is_namespace_pmem(dev)) {
937 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
938
939 return resource_size(&nspm->nsio.res);
940 } else if (is_namespace_blk(dev)) {
941 return nd_namespace_blk_size(to_nd_namespace_blk(dev));
942 } else if (is_namespace_io(dev)) {
943 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
944
945 return resource_size(&nsio->res);
946 } else
947 WARN_ONCE(1, "unknown namespace type\n");
948 return 0;
949 }
950
951 resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
952 {
953 resource_size_t size;
954
955 nvdimm_bus_lock(&ndns->dev);
956 size = __nvdimm_namespace_capacity(ndns);
957 nvdimm_bus_unlock(&ndns->dev);
958
959 return size;
960 }
961 EXPORT_SYMBOL(nvdimm_namespace_capacity);
962
963 static ssize_t size_show(struct device *dev,
964 struct device_attribute *attr, char *buf)
965 {
966 return sprintf(buf, "%llu\n", (unsigned long long)
967 nvdimm_namespace_capacity(to_ndns(dev)));
968 }
969 static DEVICE_ATTR(size, S_IRUGO, size_show, size_store);
970
971 static ssize_t uuid_show(struct device *dev,
972 struct device_attribute *attr, char *buf)
973 {
974 u8 *uuid;
975
976 if (is_namespace_pmem(dev)) {
977 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
978
979 uuid = nspm->uuid;
980 } else if (is_namespace_blk(dev)) {
981 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
982
983 uuid = nsblk->uuid;
984 } else
985 return -ENXIO;
986
987 if (uuid)
988 return sprintf(buf, "%pUb\n", uuid);
989 return sprintf(buf, "\n");
990 }
991
992 /**
993 * namespace_update_uuid - check for a unique uuid and whether we're "renaming"
994 * @nd_region: parent region so we can updates all dimms in the set
995 * @dev: namespace type for generating label_id
996 * @new_uuid: incoming uuid
997 * @old_uuid: reference to the uuid storage location in the namespace object
998 */
999 static int namespace_update_uuid(struct nd_region *nd_region,
1000 struct device *dev, u8 *new_uuid, u8 **old_uuid)
1001 {
1002 u32 flags = is_namespace_blk(dev) ? NSLABEL_FLAG_LOCAL : 0;
1003 struct nd_label_id old_label_id;
1004 struct nd_label_id new_label_id;
1005 int i;
1006
1007 if (!nd_is_uuid_unique(dev, new_uuid))
1008 return -EINVAL;
1009
1010 if (*old_uuid == NULL)
1011 goto out;
1012
1013 /*
1014 * If we've already written a label with this uuid, then it's
1015 * too late to rename because we can't reliably update the uuid
1016 * without losing the old namespace. Userspace must delete this
1017 * namespace to abandon the old uuid.
1018 */
1019 for (i = 0; i < nd_region->ndr_mappings; i++) {
1020 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1021
1022 /*
1023 * This check by itself is sufficient because old_uuid
1024 * would be NULL above if this uuid did not exist in the
1025 * currently written set.
1026 *
1027 * FIXME: can we delete uuid with zero dpa allocated?
1028 */
1029 if (nd_mapping->labels)
1030 return -EBUSY;
1031 }
1032
1033 nd_label_gen_id(&old_label_id, *old_uuid, flags);
1034 nd_label_gen_id(&new_label_id, new_uuid, flags);
1035 for (i = 0; i < nd_region->ndr_mappings; i++) {
1036 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1037 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1038 struct resource *res;
1039
1040 for_each_dpa_resource(ndd, res)
1041 if (strcmp(res->name, old_label_id.id) == 0)
1042 sprintf((void *) res->name, "%s",
1043 new_label_id.id);
1044 }
1045 kfree(*old_uuid);
1046 out:
1047 *old_uuid = new_uuid;
1048 return 0;
1049 }
1050
1051 static ssize_t uuid_store(struct device *dev,
1052 struct device_attribute *attr, const char *buf, size_t len)
1053 {
1054 struct nd_region *nd_region = to_nd_region(dev->parent);
1055 u8 *uuid = NULL;
1056 ssize_t rc = 0;
1057 u8 **ns_uuid;
1058
1059 if (is_namespace_pmem(dev)) {
1060 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1061
1062 ns_uuid = &nspm->uuid;
1063 } else if (is_namespace_blk(dev)) {
1064 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1065
1066 ns_uuid = &nsblk->uuid;
1067 } else
1068 return -ENXIO;
1069
1070 device_lock(dev);
1071 nvdimm_bus_lock(dev);
1072 wait_nvdimm_bus_probe_idle(dev);
1073 if (to_ndns(dev)->claim)
1074 rc = -EBUSY;
1075 if (rc >= 0)
1076 rc = nd_uuid_store(dev, &uuid, buf, len);
1077 if (rc >= 0)
1078 rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid);
1079 if (rc >= 0)
1080 rc = nd_namespace_label_update(nd_region, dev);
1081 else
1082 kfree(uuid);
1083 dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
1084 rc, buf, buf[len - 1] == '\n' ? "" : "\n");
1085 nvdimm_bus_unlock(dev);
1086 device_unlock(dev);
1087
1088 return rc < 0 ? rc : len;
1089 }
1090 static DEVICE_ATTR_RW(uuid);
1091
1092 static ssize_t resource_show(struct device *dev,
1093 struct device_attribute *attr, char *buf)
1094 {
1095 struct resource *res;
1096
1097 if (is_namespace_pmem(dev)) {
1098 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1099
1100 res = &nspm->nsio.res;
1101 } else if (is_namespace_io(dev)) {
1102 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
1103
1104 res = &nsio->res;
1105 } else
1106 return -ENXIO;
1107
1108 /* no address to convey if the namespace has no allocation */
1109 if (resource_size(res) == 0)
1110 return -ENXIO;
1111 return sprintf(buf, "%#llx\n", (unsigned long long) res->start);
1112 }
1113 static DEVICE_ATTR_RO(resource);
1114
1115 static const unsigned long ns_lbasize_supported[] = { 512, 520, 528,
1116 4096, 4104, 4160, 4224, 0 };
1117
1118 static ssize_t sector_size_show(struct device *dev,
1119 struct device_attribute *attr, char *buf)
1120 {
1121 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1122
1123 if (!is_namespace_blk(dev))
1124 return -ENXIO;
1125
1126 return nd_sector_size_show(nsblk->lbasize, ns_lbasize_supported, buf);
1127 }
1128
1129 static ssize_t sector_size_store(struct device *dev,
1130 struct device_attribute *attr, const char *buf, size_t len)
1131 {
1132 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1133 struct nd_region *nd_region = to_nd_region(dev->parent);
1134 ssize_t rc = 0;
1135
1136 if (!is_namespace_blk(dev))
1137 return -ENXIO;
1138
1139 device_lock(dev);
1140 nvdimm_bus_lock(dev);
1141 if (to_ndns(dev)->claim)
1142 rc = -EBUSY;
1143 if (rc >= 0)
1144 rc = nd_sector_size_store(dev, buf, &nsblk->lbasize,
1145 ns_lbasize_supported);
1146 if (rc >= 0)
1147 rc = nd_namespace_label_update(nd_region, dev);
1148 dev_dbg(dev, "%s: result: %zd %s: %s%s", __func__,
1149 rc, rc < 0 ? "tried" : "wrote", buf,
1150 buf[len - 1] == '\n' ? "" : "\n");
1151 nvdimm_bus_unlock(dev);
1152 device_unlock(dev);
1153
1154 return rc ? rc : len;
1155 }
1156 static DEVICE_ATTR_RW(sector_size);
1157
1158 static ssize_t dpa_extents_show(struct device *dev,
1159 struct device_attribute *attr, char *buf)
1160 {
1161 struct nd_region *nd_region = to_nd_region(dev->parent);
1162 struct nd_label_id label_id;
1163 int count = 0, i;
1164 u8 *uuid = NULL;
1165 u32 flags = 0;
1166
1167 nvdimm_bus_lock(dev);
1168 if (is_namespace_pmem(dev)) {
1169 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1170
1171 uuid = nspm->uuid;
1172 flags = 0;
1173 } else if (is_namespace_blk(dev)) {
1174 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1175
1176 uuid = nsblk->uuid;
1177 flags = NSLABEL_FLAG_LOCAL;
1178 }
1179
1180 if (!uuid)
1181 goto out;
1182
1183 nd_label_gen_id(&label_id, uuid, flags);
1184 for (i = 0; i < nd_region->ndr_mappings; i++) {
1185 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1186 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1187 struct resource *res;
1188
1189 for_each_dpa_resource(ndd, res)
1190 if (strcmp(res->name, label_id.id) == 0)
1191 count++;
1192 }
1193 out:
1194 nvdimm_bus_unlock(dev);
1195
1196 return sprintf(buf, "%d\n", count);
1197 }
1198 static DEVICE_ATTR_RO(dpa_extents);
1199
1200 static ssize_t holder_show(struct device *dev,
1201 struct device_attribute *attr, char *buf)
1202 {
1203 struct nd_namespace_common *ndns = to_ndns(dev);
1204 ssize_t rc;
1205
1206 device_lock(dev);
1207 rc = sprintf(buf, "%s\n", ndns->claim ? dev_name(ndns->claim) : "");
1208 device_unlock(dev);
1209
1210 return rc;
1211 }
1212 static DEVICE_ATTR_RO(holder);
1213
1214 static ssize_t force_raw_store(struct device *dev,
1215 struct device_attribute *attr, const char *buf, size_t len)
1216 {
1217 bool force_raw;
1218 int rc = strtobool(buf, &force_raw);
1219
1220 if (rc)
1221 return rc;
1222
1223 to_ndns(dev)->force_raw = force_raw;
1224 return len;
1225 }
1226
1227 static ssize_t force_raw_show(struct device *dev,
1228 struct device_attribute *attr, char *buf)
1229 {
1230 return sprintf(buf, "%d\n", to_ndns(dev)->force_raw);
1231 }
1232 static DEVICE_ATTR_RW(force_raw);
1233
1234 static struct attribute *nd_namespace_attributes[] = {
1235 &dev_attr_nstype.attr,
1236 &dev_attr_size.attr,
1237 &dev_attr_uuid.attr,
1238 &dev_attr_holder.attr,
1239 &dev_attr_resource.attr,
1240 &dev_attr_alt_name.attr,
1241 &dev_attr_force_raw.attr,
1242 &dev_attr_sector_size.attr,
1243 &dev_attr_dpa_extents.attr,
1244 NULL,
1245 };
1246
1247 static umode_t namespace_visible(struct kobject *kobj,
1248 struct attribute *a, int n)
1249 {
1250 struct device *dev = container_of(kobj, struct device, kobj);
1251
1252 if (a == &dev_attr_resource.attr) {
1253 if (is_namespace_blk(dev))
1254 return 0;
1255 return a->mode;
1256 }
1257
1258 if (is_namespace_pmem(dev) || is_namespace_blk(dev)) {
1259 if (a == &dev_attr_size.attr)
1260 return S_IWUSR | S_IRUGO;
1261
1262 if (is_namespace_pmem(dev) && a == &dev_attr_sector_size.attr)
1263 return 0;
1264
1265 return a->mode;
1266 }
1267
1268 if (a == &dev_attr_nstype.attr || a == &dev_attr_size.attr
1269 || a == &dev_attr_holder.attr
1270 || a == &dev_attr_force_raw.attr)
1271 return a->mode;
1272
1273 return 0;
1274 }
1275
1276 static struct attribute_group nd_namespace_attribute_group = {
1277 .attrs = nd_namespace_attributes,
1278 .is_visible = namespace_visible,
1279 };
1280
1281 static const struct attribute_group *nd_namespace_attribute_groups[] = {
1282 &nd_device_attribute_group,
1283 &nd_namespace_attribute_group,
1284 &nd_numa_attribute_group,
1285 NULL,
1286 };
1287
1288 struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev)
1289 {
1290 struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL;
1291 struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL;
1292 struct nd_namespace_common *ndns;
1293 resource_size_t size;
1294
1295 if (nd_btt || nd_pfn) {
1296 struct device *host = NULL;
1297
1298 if (nd_btt) {
1299 host = &nd_btt->dev;
1300 ndns = nd_btt->ndns;
1301 } else if (nd_pfn) {
1302 host = &nd_pfn->dev;
1303 ndns = nd_pfn->ndns;
1304 }
1305
1306 if (!ndns || !host)
1307 return ERR_PTR(-ENODEV);
1308
1309 /*
1310 * Flush any in-progess probes / removals in the driver
1311 * for the raw personality of this namespace.
1312 */
1313 device_lock(&ndns->dev);
1314 device_unlock(&ndns->dev);
1315 if (ndns->dev.driver) {
1316 dev_dbg(&ndns->dev, "is active, can't bind %s\n",
1317 dev_name(host));
1318 return ERR_PTR(-EBUSY);
1319 }
1320 if (dev_WARN_ONCE(&ndns->dev, ndns->claim != host,
1321 "host (%s) vs claim (%s) mismatch\n",
1322 dev_name(host),
1323 dev_name(ndns->claim)))
1324 return ERR_PTR(-ENXIO);
1325 } else {
1326 ndns = to_ndns(dev);
1327 if (ndns->claim) {
1328 dev_dbg(dev, "claimed by %s, failing probe\n",
1329 dev_name(ndns->claim));
1330
1331 return ERR_PTR(-ENXIO);
1332 }
1333 }
1334
1335 size = nvdimm_namespace_capacity(ndns);
1336 if (size < ND_MIN_NAMESPACE_SIZE) {
1337 dev_dbg(&ndns->dev, "%pa, too small must be at least %#x\n",
1338 &size, ND_MIN_NAMESPACE_SIZE);
1339 return ERR_PTR(-ENODEV);
1340 }
1341
1342 if (is_namespace_pmem(&ndns->dev)) {
1343 struct nd_namespace_pmem *nspm;
1344
1345 nspm = to_nd_namespace_pmem(&ndns->dev);
1346 if (!nspm->uuid) {
1347 dev_dbg(&ndns->dev, "%s: uuid not set\n", __func__);
1348 return ERR_PTR(-ENODEV);
1349 }
1350 } else if (is_namespace_blk(&ndns->dev)) {
1351 struct nd_namespace_blk *nsblk;
1352
1353 nsblk = to_nd_namespace_blk(&ndns->dev);
1354 if (!nd_namespace_blk_validate(nsblk))
1355 return ERR_PTR(-ENODEV);
1356 }
1357
1358 return ndns;
1359 }
1360 EXPORT_SYMBOL(nvdimm_namespace_common_probe);
1361
1362 static struct device **create_namespace_io(struct nd_region *nd_region)
1363 {
1364 struct nd_namespace_io *nsio;
1365 struct device *dev, **devs;
1366 struct resource *res;
1367
1368 nsio = kzalloc(sizeof(*nsio), GFP_KERNEL);
1369 if (!nsio)
1370 return NULL;
1371
1372 devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL);
1373 if (!devs) {
1374 kfree(nsio);
1375 return NULL;
1376 }
1377
1378 dev = &nsio->common.dev;
1379 dev->type = &namespace_io_device_type;
1380 dev->parent = &nd_region->dev;
1381 res = &nsio->res;
1382 res->name = dev_name(&nd_region->dev);
1383 res->flags = IORESOURCE_MEM;
1384 res->start = nd_region->ndr_start;
1385 res->end = res->start + nd_region->ndr_size - 1;
1386
1387 devs[0] = dev;
1388 return devs;
1389 }
1390
1391 static bool has_uuid_at_pos(struct nd_region *nd_region, u8 *uuid,
1392 u64 cookie, u16 pos)
1393 {
1394 struct nd_namespace_label *found = NULL;
1395 int i;
1396
1397 for (i = 0; i < nd_region->ndr_mappings; i++) {
1398 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1399 struct nd_namespace_label *nd_label;
1400 bool found_uuid = false;
1401 int l;
1402
1403 for_each_label(l, nd_label, nd_mapping->labels) {
1404 u64 isetcookie = __le64_to_cpu(nd_label->isetcookie);
1405 u16 position = __le16_to_cpu(nd_label->position);
1406 u16 nlabel = __le16_to_cpu(nd_label->nlabel);
1407
1408 if (isetcookie != cookie)
1409 continue;
1410
1411 if (memcmp(nd_label->uuid, uuid, NSLABEL_UUID_LEN) != 0)
1412 continue;
1413
1414 if (found_uuid) {
1415 dev_dbg(to_ndd(nd_mapping)->dev,
1416 "%s duplicate entry for uuid\n",
1417 __func__);
1418 return false;
1419 }
1420 found_uuid = true;
1421 if (nlabel != nd_region->ndr_mappings)
1422 continue;
1423 if (position != pos)
1424 continue;
1425 found = nd_label;
1426 break;
1427 }
1428 if (found)
1429 break;
1430 }
1431 return found != NULL;
1432 }
1433
1434 static int select_pmem_id(struct nd_region *nd_region, u8 *pmem_id)
1435 {
1436 struct nd_namespace_label *select = NULL;
1437 int i;
1438
1439 if (!pmem_id)
1440 return -ENODEV;
1441
1442 for (i = 0; i < nd_region->ndr_mappings; i++) {
1443 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1444 struct nd_namespace_label *nd_label;
1445 u64 hw_start, hw_end, pmem_start, pmem_end;
1446 int l;
1447
1448 for_each_label(l, nd_label, nd_mapping->labels)
1449 if (memcmp(nd_label->uuid, pmem_id, NSLABEL_UUID_LEN) == 0)
1450 break;
1451
1452 if (!nd_label) {
1453 WARN_ON(1);
1454 return -EINVAL;
1455 }
1456
1457 select = nd_label;
1458 /*
1459 * Check that this label is compliant with the dpa
1460 * range published in NFIT
1461 */
1462 hw_start = nd_mapping->start;
1463 hw_end = hw_start + nd_mapping->size;
1464 pmem_start = __le64_to_cpu(select->dpa);
1465 pmem_end = pmem_start + __le64_to_cpu(select->rawsize);
1466 if (pmem_start == hw_start && pmem_end <= hw_end)
1467 /* pass */;
1468 else
1469 return -EINVAL;
1470
1471 nd_mapping->labels[0] = select;
1472 nd_mapping->labels[1] = NULL;
1473 }
1474 return 0;
1475 }
1476
1477 /**
1478 * find_pmem_label_set - validate interleave set labelling, retrieve label0
1479 * @nd_region: region with mappings to validate
1480 */
1481 static int find_pmem_label_set(struct nd_region *nd_region,
1482 struct nd_namespace_pmem *nspm)
1483 {
1484 u64 cookie = nd_region_interleave_set_cookie(nd_region);
1485 struct nd_namespace_label *nd_label;
1486 u8 select_id[NSLABEL_UUID_LEN];
1487 resource_size_t size = 0;
1488 u8 *pmem_id = NULL;
1489 int rc = -ENODEV, l;
1490 u16 i;
1491
1492 if (cookie == 0)
1493 return -ENXIO;
1494
1495 /*
1496 * Find a complete set of labels by uuid. By definition we can start
1497 * with any mapping as the reference label
1498 */
1499 for_each_label(l, nd_label, nd_region->mapping[0].labels) {
1500 u64 isetcookie = __le64_to_cpu(nd_label->isetcookie);
1501
1502 if (isetcookie != cookie)
1503 continue;
1504
1505 for (i = 0; nd_region->ndr_mappings; i++)
1506 if (!has_uuid_at_pos(nd_region, nd_label->uuid,
1507 cookie, i))
1508 break;
1509 if (i < nd_region->ndr_mappings) {
1510 /*
1511 * Give up if we don't find an instance of a
1512 * uuid at each position (from 0 to
1513 * nd_region->ndr_mappings - 1), or if we find a
1514 * dimm with two instances of the same uuid.
1515 */
1516 rc = -EINVAL;
1517 goto err;
1518 } else if (pmem_id) {
1519 /*
1520 * If there is more than one valid uuid set, we
1521 * need userspace to clean this up.
1522 */
1523 rc = -EBUSY;
1524 goto err;
1525 }
1526 memcpy(select_id, nd_label->uuid, NSLABEL_UUID_LEN);
1527 pmem_id = select_id;
1528 }
1529
1530 /*
1531 * Fix up each mapping's 'labels' to have the validated pmem label for
1532 * that position at labels[0], and NULL at labels[1]. In the process,
1533 * check that the namespace aligns with interleave-set. We know
1534 * that it does not overlap with any blk namespaces by virtue of
1535 * the dimm being enabled (i.e. nd_label_reserve_dpa()
1536 * succeeded).
1537 */
1538 rc = select_pmem_id(nd_region, pmem_id);
1539 if (rc)
1540 goto err;
1541
1542 /* Calculate total size and populate namespace properties from label0 */
1543 for (i = 0; i < nd_region->ndr_mappings; i++) {
1544 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1545 struct nd_namespace_label *label0 = nd_mapping->labels[0];
1546
1547 size += __le64_to_cpu(label0->rawsize);
1548 if (__le16_to_cpu(label0->position) != 0)
1549 continue;
1550 WARN_ON(nspm->alt_name || nspm->uuid);
1551 nspm->alt_name = kmemdup((void __force *) label0->name,
1552 NSLABEL_NAME_LEN, GFP_KERNEL);
1553 nspm->uuid = kmemdup((void __force *) label0->uuid,
1554 NSLABEL_UUID_LEN, GFP_KERNEL);
1555 }
1556
1557 if (!nspm->alt_name || !nspm->uuid) {
1558 rc = -ENOMEM;
1559 goto err;
1560 }
1561
1562 nd_namespace_pmem_set_size(nd_region, nspm, size);
1563
1564 return 0;
1565 err:
1566 switch (rc) {
1567 case -EINVAL:
1568 dev_dbg(&nd_region->dev, "%s: invalid label(s)\n", __func__);
1569 break;
1570 case -ENODEV:
1571 dev_dbg(&nd_region->dev, "%s: label not found\n", __func__);
1572 break;
1573 default:
1574 dev_dbg(&nd_region->dev, "%s: unexpected err: %d\n",
1575 __func__, rc);
1576 break;
1577 }
1578 return rc;
1579 }
1580
1581 static struct device **create_namespace_pmem(struct nd_region *nd_region)
1582 {
1583 struct nd_namespace_pmem *nspm;
1584 struct device *dev, **devs;
1585 struct resource *res;
1586 int rc;
1587
1588 nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
1589 if (!nspm)
1590 return NULL;
1591
1592 dev = &nspm->nsio.common.dev;
1593 dev->type = &namespace_pmem_device_type;
1594 dev->parent = &nd_region->dev;
1595 res = &nspm->nsio.res;
1596 res->name = dev_name(&nd_region->dev);
1597 res->flags = IORESOURCE_MEM;
1598 rc = find_pmem_label_set(nd_region, nspm);
1599 if (rc == -ENODEV) {
1600 int i;
1601
1602 /* Pass, try to permit namespace creation... */
1603 for (i = 0; i < nd_region->ndr_mappings; i++) {
1604 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1605
1606 kfree(nd_mapping->labels);
1607 nd_mapping->labels = NULL;
1608 }
1609
1610 /* Publish a zero-sized namespace for userspace to configure. */
1611 nd_namespace_pmem_set_size(nd_region, nspm, 0);
1612
1613 rc = 0;
1614 } else if (rc)
1615 goto err;
1616
1617 devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL);
1618 if (!devs)
1619 goto err;
1620
1621 devs[0] = dev;
1622 return devs;
1623
1624 err:
1625 namespace_pmem_release(&nspm->nsio.common.dev);
1626 return NULL;
1627 }
1628
1629 struct resource *nsblk_add_resource(struct nd_region *nd_region,
1630 struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk,
1631 resource_size_t start)
1632 {
1633 struct nd_label_id label_id;
1634 struct resource *res;
1635
1636 nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
1637 res = krealloc(nsblk->res,
1638 sizeof(void *) * (nsblk->num_resources + 1),
1639 GFP_KERNEL);
1640 if (!res)
1641 return NULL;
1642 nsblk->res = (struct resource **) res;
1643 for_each_dpa_resource(ndd, res)
1644 if (strcmp(res->name, label_id.id) == 0
1645 && res->start == start) {
1646 nsblk->res[nsblk->num_resources++] = res;
1647 return res;
1648 }
1649 return NULL;
1650 }
1651
1652 static struct device *nd_namespace_blk_create(struct nd_region *nd_region)
1653 {
1654 struct nd_namespace_blk *nsblk;
1655 struct device *dev;
1656
1657 if (!is_nd_blk(&nd_region->dev))
1658 return NULL;
1659
1660 nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
1661 if (!nsblk)
1662 return NULL;
1663
1664 dev = &nsblk->common.dev;
1665 dev->type = &namespace_blk_device_type;
1666 nsblk->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
1667 if (nsblk->id < 0) {
1668 kfree(nsblk);
1669 return NULL;
1670 }
1671 dev_set_name(dev, "namespace%d.%d", nd_region->id, nsblk->id);
1672 dev->parent = &nd_region->dev;
1673 dev->groups = nd_namespace_attribute_groups;
1674
1675 return &nsblk->common.dev;
1676 }
1677
1678 void nd_region_create_blk_seed(struct nd_region *nd_region)
1679 {
1680 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
1681 nd_region->ns_seed = nd_namespace_blk_create(nd_region);
1682 /*
1683 * Seed creation failures are not fatal, provisioning is simply
1684 * disabled until memory becomes available
1685 */
1686 if (!nd_region->ns_seed)
1687 dev_err(&nd_region->dev, "failed to create blk namespace\n");
1688 else
1689 nd_device_register(nd_region->ns_seed);
1690 }
1691
1692 void nd_region_create_btt_seed(struct nd_region *nd_region)
1693 {
1694 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
1695 nd_region->btt_seed = nd_btt_create(nd_region);
1696 /*
1697 * Seed creation failures are not fatal, provisioning is simply
1698 * disabled until memory becomes available
1699 */
1700 if (!nd_region->btt_seed)
1701 dev_err(&nd_region->dev, "failed to create btt namespace\n");
1702 }
1703
1704 static struct device **create_namespace_blk(struct nd_region *nd_region)
1705 {
1706 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
1707 struct nd_namespace_label *nd_label;
1708 struct device *dev, **devs = NULL;
1709 struct nd_namespace_blk *nsblk;
1710 struct nvdimm_drvdata *ndd;
1711 int i, l, count = 0;
1712 struct resource *res;
1713
1714 if (nd_region->ndr_mappings == 0)
1715 return NULL;
1716
1717 ndd = to_ndd(nd_mapping);
1718 for_each_label(l, nd_label, nd_mapping->labels) {
1719 u32 flags = __le32_to_cpu(nd_label->flags);
1720 char *name[NSLABEL_NAME_LEN];
1721 struct device **__devs;
1722
1723 if (flags & NSLABEL_FLAG_LOCAL)
1724 /* pass */;
1725 else
1726 continue;
1727
1728 for (i = 0; i < count; i++) {
1729 nsblk = to_nd_namespace_blk(devs[i]);
1730 if (memcmp(nsblk->uuid, nd_label->uuid,
1731 NSLABEL_UUID_LEN) == 0) {
1732 res = nsblk_add_resource(nd_region, ndd, nsblk,
1733 __le64_to_cpu(nd_label->dpa));
1734 if (!res)
1735 goto err;
1736 nd_dbg_dpa(nd_region, ndd, res, "%s assign\n",
1737 dev_name(&nsblk->common.dev));
1738 break;
1739 }
1740 }
1741 if (i < count)
1742 continue;
1743 __devs = kcalloc(count + 2, sizeof(dev), GFP_KERNEL);
1744 if (!__devs)
1745 goto err;
1746 memcpy(__devs, devs, sizeof(dev) * count);
1747 kfree(devs);
1748 devs = __devs;
1749
1750 nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
1751 if (!nsblk)
1752 goto err;
1753 dev = &nsblk->common.dev;
1754 dev->type = &namespace_blk_device_type;
1755 dev->parent = &nd_region->dev;
1756 dev_set_name(dev, "namespace%d.%d", nd_region->id, count);
1757 devs[count++] = dev;
1758 nsblk->id = -1;
1759 nsblk->lbasize = __le64_to_cpu(nd_label->lbasize);
1760 nsblk->uuid = kmemdup(nd_label->uuid, NSLABEL_UUID_LEN,
1761 GFP_KERNEL);
1762 if (!nsblk->uuid)
1763 goto err;
1764 memcpy(name, nd_label->name, NSLABEL_NAME_LEN);
1765 if (name[0])
1766 nsblk->alt_name = kmemdup(name, NSLABEL_NAME_LEN,
1767 GFP_KERNEL);
1768 res = nsblk_add_resource(nd_region, ndd, nsblk,
1769 __le64_to_cpu(nd_label->dpa));
1770 if (!res)
1771 goto err;
1772 nd_dbg_dpa(nd_region, ndd, res, "%s assign\n",
1773 dev_name(&nsblk->common.dev));
1774 }
1775
1776 dev_dbg(&nd_region->dev, "%s: discovered %d blk namespace%s\n",
1777 __func__, count, count == 1 ? "" : "s");
1778
1779 if (count == 0) {
1780 /* Publish a zero-sized namespace for userspace to configure. */
1781 for (i = 0; i < nd_region->ndr_mappings; i++) {
1782 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1783
1784 kfree(nd_mapping->labels);
1785 nd_mapping->labels = NULL;
1786 }
1787
1788 devs = kcalloc(2, sizeof(dev), GFP_KERNEL);
1789 if (!devs)
1790 goto err;
1791 nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
1792 if (!nsblk)
1793 goto err;
1794 dev = &nsblk->common.dev;
1795 dev->type = &namespace_blk_device_type;
1796 dev->parent = &nd_region->dev;
1797 devs[count++] = dev;
1798 }
1799
1800 return devs;
1801
1802 err:
1803 for (i = 0; i < count; i++) {
1804 nsblk = to_nd_namespace_blk(devs[i]);
1805 namespace_blk_release(&nsblk->common.dev);
1806 }
1807 kfree(devs);
1808 return NULL;
1809 }
1810
1811 static int init_active_labels(struct nd_region *nd_region)
1812 {
1813 int i;
1814
1815 for (i = 0; i < nd_region->ndr_mappings; i++) {
1816 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1817 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1818 struct nvdimm *nvdimm = nd_mapping->nvdimm;
1819 int count, j;
1820
1821 /*
1822 * If the dimm is disabled then prevent the region from
1823 * being activated if it aliases DPA.
1824 */
1825 if (!ndd) {
1826 if ((nvdimm->flags & NDD_ALIASING) == 0)
1827 return 0;
1828 dev_dbg(&nd_region->dev, "%s: is disabled, failing probe\n",
1829 dev_name(&nd_mapping->nvdimm->dev));
1830 return -ENXIO;
1831 }
1832 nd_mapping->ndd = ndd;
1833 atomic_inc(&nvdimm->busy);
1834 get_ndd(ndd);
1835
1836 count = nd_label_active_count(ndd);
1837 dev_dbg(ndd->dev, "%s: %d\n", __func__, count);
1838 if (!count)
1839 continue;
1840 nd_mapping->labels = kcalloc(count + 1, sizeof(void *),
1841 GFP_KERNEL);
1842 if (!nd_mapping->labels)
1843 return -ENOMEM;
1844 for (j = 0; j < count; j++) {
1845 struct nd_namespace_label *label;
1846
1847 label = nd_label_active(ndd, j);
1848 nd_mapping->labels[j] = label;
1849 }
1850 }
1851
1852 return 0;
1853 }
1854
1855 int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
1856 {
1857 struct device **devs = NULL;
1858 int i, rc = 0, type;
1859
1860 *err = 0;
1861 nvdimm_bus_lock(&nd_region->dev);
1862 rc = init_active_labels(nd_region);
1863 if (rc) {
1864 nvdimm_bus_unlock(&nd_region->dev);
1865 return rc;
1866 }
1867
1868 type = nd_region_to_nstype(nd_region);
1869 switch (type) {
1870 case ND_DEVICE_NAMESPACE_IO:
1871 devs = create_namespace_io(nd_region);
1872 break;
1873 case ND_DEVICE_NAMESPACE_PMEM:
1874 devs = create_namespace_pmem(nd_region);
1875 break;
1876 case ND_DEVICE_NAMESPACE_BLK:
1877 devs = create_namespace_blk(nd_region);
1878 break;
1879 default:
1880 break;
1881 }
1882 nvdimm_bus_unlock(&nd_region->dev);
1883
1884 if (!devs)
1885 return -ENODEV;
1886
1887 for (i = 0; devs[i]; i++) {
1888 struct device *dev = devs[i];
1889 int id;
1890
1891 if (type == ND_DEVICE_NAMESPACE_BLK) {
1892 struct nd_namespace_blk *nsblk;
1893
1894 nsblk = to_nd_namespace_blk(dev);
1895 id = ida_simple_get(&nd_region->ns_ida, 0, 0,
1896 GFP_KERNEL);
1897 nsblk->id = id;
1898 } else
1899 id = i;
1900
1901 if (id < 0)
1902 break;
1903 dev_set_name(dev, "namespace%d.%d", nd_region->id, id);
1904 dev->groups = nd_namespace_attribute_groups;
1905 nd_device_register(dev);
1906 }
1907 if (i)
1908 nd_region->ns_seed = devs[0];
1909
1910 if (devs[i]) {
1911 int j;
1912
1913 for (j = i; devs[j]; j++) {
1914 struct device *dev = devs[j];
1915
1916 device_initialize(dev);
1917 put_device(dev);
1918 }
1919 *err = j - i;
1920 /*
1921 * All of the namespaces we tried to register failed, so
1922 * fail region activation.
1923 */
1924 if (*err == 0)
1925 rc = -ENODEV;
1926 }
1927 kfree(devs);
1928
1929 if (rc == -ENODEV)
1930 return rc;
1931
1932 return i;
1933 }
Linux kernel - Deliverables
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