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libnvdimm: cleanup nvdimm_namespace_common_probe(), kill 'host'
[deliverable/linux.git] / drivers / nvdimm / namespace_devs.c
CommitLineData
3d88002e
DW		 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>
004f1afb 16#include <linux/pmem.h>
3d88002e 17#include <linux/nd.h>
bf9bccc1 18#include "nd-core.h"
3d88002e
DW		 19#include "nd.h"
20
21static 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
bf9bccc1
DW		 28static 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
37static void namespace_blk_release(struct device *dev)
38{
1b40e09a
DW		 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);
bf9bccc1
DW		 48}
49
3d88002e
DW		 50static struct device_type namespace_io_device_type = {
51 .name = "nd_namespace_io",
52 .release = namespace_io_release,
53};
54
bf9bccc1
DW		 55static struct device_type namespace_pmem_device_type = {
56 .name = "nd_namespace_pmem",
57 .release = namespace_pmem_release,
58};
59
60static struct device_type namespace_blk_device_type = {
61 .name = "nd_namespace_blk",
62 .release = namespace_blk_release,
63};
64
65static bool is_namespace_pmem(struct device *dev)
66{
67 return dev ? dev->type == &namespace_pmem_device_type : false;
68}
69
70static bool is_namespace_blk(struct device *dev)
71{
72 return dev ? dev->type == &namespace_blk_device_type : false;
73}
74
75static bool is_namespace_io(struct device *dev)
76{
77 return dev ? dev->type == &namespace_io_device_type : false;
78}
79
e07ecd76
DW		 80static int is_uuid_busy(struct device *dev, void *data)
81{
82 u8 *uuid1 = data, *uuid2 = NULL;
83
84 if (is_namespace_pmem(dev)) {
85 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
86
87 uuid2 = nspm->uuid;
88 } else if (is_namespace_blk(dev)) {
89 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
90
91 uuid2 = nsblk->uuid;
92 } else if (is_nd_btt(dev)) {
93 struct nd_btt *nd_btt = to_nd_btt(dev);
94
95 uuid2 = nd_btt->uuid;
96 } else if (is_nd_pfn(dev)) {
97 struct nd_pfn *nd_pfn = to_nd_pfn(dev);
98
99 uuid2 = nd_pfn->uuid;
100 }
101
102 if (uuid2 && memcmp(uuid1, uuid2, NSLABEL_UUID_LEN) == 0)
103 return -EBUSY;
104
105 return 0;
106}
107
108static int is_namespace_uuid_busy(struct device *dev, void *data)
109{
110 if (is_nd_pmem(dev) || is_nd_blk(dev))
111 return device_for_each_child(dev, data, is_uuid_busy);
112 return 0;
113}
114
115/**
116 * nd_is_uuid_unique - verify that no other namespace has @uuid
117 * @dev: any device on a nvdimm_bus
118 * @uuid: uuid to check
119 */
120bool nd_is_uuid_unique(struct device *dev, u8 *uuid)
121{
122 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
123
124 if (!nvdimm_bus)
125 return false;
126 WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm_bus->dev));
127 if (device_for_each_child(&nvdimm_bus->dev, uuid,
128 is_namespace_uuid_busy) != 0)
129 return false;
130 return true;
131}
132
004f1afb
DW		 133bool pmem_should_map_pages(struct device *dev)
134{
135 struct nd_region *nd_region = to_nd_region(dev->parent);
cfe30b87 136 struct nd_namespace_io *nsio;
004f1afb
DW		 137
138 if (!IS_ENABLED(CONFIG_ZONE_DEVICE))
139 return false;
140
141 if (!test_bit(ND_REGION_PAGEMAP, &nd_region->flags))
142 return false;
143
144 if (is_nd_pfn(dev) || is_nd_btt(dev))
145 return false;
146
cfe30b87
DW		 147 nsio = to_nd_namespace_io(dev);
148 if (region_intersects(nsio->res.start, resource_size(&nsio->res),
149 IORESOURCE_SYSTEM_RAM,
150 IORES_DESC_NONE) == REGION_MIXED)
151 return false;
152
004f1afb
DW		 153#ifdef ARCH_MEMREMAP_PMEM
154 return ARCH_MEMREMAP_PMEM == MEMREMAP_WB;
155#else
156 return false;
157#endif
158}
159EXPORT_SYMBOL(pmem_should_map_pages);
160
5212e11f
VV		 161const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
162 char *name)
163{
164 struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
004f1afb 165 const char *suffix = NULL;
5212e11f 166
0731de0d
DW		 167 if (ndns->claim && is_nd_btt(ndns->claim))
168 suffix = "s";
5212e11f 169
004f1afb 170 if (is_namespace_pmem(&ndns->dev) || is_namespace_io(&ndns->dev)) {
004f1afb
DW		 171 sprintf(name, "pmem%d%s", nd_region->id, suffix ? suffix : "");
172 } else if (is_namespace_blk(&ndns->dev)) {
5212e11f
VV		 173 struct nd_namespace_blk *nsblk;
174
175 nsblk = to_nd_namespace_blk(&ndns->dev);
004f1afb
DW		 176 sprintf(name, "ndblk%d.%d%s", nd_region->id, nsblk->id,
177 suffix ? suffix : "");
5212e11f
VV		 178 } else {
179 return NULL;
180 }
181
182 return name;
183}
184EXPORT_SYMBOL(nvdimm_namespace_disk_name);
185
6ec68954
VV		 186const u8 *nd_dev_to_uuid(struct device *dev)
187{
188 static const u8 null_uuid[16];
189
190 if (!dev)
191 return null_uuid;
192
193 if (is_namespace_pmem(dev)) {
194 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
195
196 return nspm->uuid;
197 } else if (is_namespace_blk(dev)) {
198 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
199
200 return nsblk->uuid;
201 } else
202 return null_uuid;
203}
204EXPORT_SYMBOL(nd_dev_to_uuid);
205
3d88002e
DW		 206static ssize_t nstype_show(struct device *dev,
207 struct device_attribute *attr, char *buf)
208{
209 struct nd_region *nd_region = to_nd_region(dev->parent);
210
211 return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region));
212}
213static DEVICE_ATTR_RO(nstype);
214
bf9bccc1
DW		 215static ssize_t __alt_name_store(struct device *dev, const char *buf,
216 const size_t len)
217{
218 char *input, *pos, *alt_name, **ns_altname;
219 ssize_t rc;
220
221 if (is_namespace_pmem(dev)) {
222 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
223
224 ns_altname = &nspm->alt_name;
225 } else if (is_namespace_blk(dev)) {
1b40e09a
DW		 226 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
227
228 ns_altname = &nsblk->alt_name;
bf9bccc1
DW		 229 } else
230 return -ENXIO;
231
8c2f7e86 232 if (dev->driver || to_ndns(dev)->claim)
bf9bccc1
DW		 233 return -EBUSY;
234
235 input = kmemdup(buf, len + 1, GFP_KERNEL);
236 if (!input)
237 return -ENOMEM;
238
239 input[len] = '\0';
240 pos = strim(input);
241 if (strlen(pos) + 1 > NSLABEL_NAME_LEN) {
242 rc = -EINVAL;
243 goto out;
244 }
245
246 alt_name = kzalloc(NSLABEL_NAME_LEN, GFP_KERNEL);
247 if (!alt_name) {
248 rc = -ENOMEM;
249 goto out;
250 }
251 kfree(*ns_altname);
252 *ns_altname = alt_name;
253 sprintf(*ns_altname, "%s", pos);
254 rc = len;
255
256out:
257 kfree(input);
258 return rc;
259}
260
1b40e09a
DW		 261static resource_size_t nd_namespace_blk_size(struct nd_namespace_blk *nsblk)
262{
8c2f7e86 263 struct nd_region *nd_region = to_nd_region(nsblk->common.dev.parent);
1b40e09a
DW		 264 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
265 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
266 struct nd_label_id label_id;
267 resource_size_t size = 0;
268 struct resource *res;
269
270 if (!nsblk->uuid)
271 return 0;
272 nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
273 for_each_dpa_resource(ndd, res)
274 if (strcmp(res->name, label_id.id) == 0)
275 size += resource_size(res);
276 return size;
277}
278
047fc8a1
RZ		 279static bool __nd_namespace_blk_validate(struct nd_namespace_blk *nsblk)
280{
281 struct nd_region *nd_region = to_nd_region(nsblk->common.dev.parent);
282 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
283 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
284 struct nd_label_id label_id;
285 struct resource *res;
286 int count, i;
287
288 if (!nsblk->uuid || !nsblk->lbasize || !ndd)
289 return false;
290
291 count = 0;
292 nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
293 for_each_dpa_resource(ndd, res) {
294 if (strcmp(res->name, label_id.id) != 0)
295 continue;
296 /*
297 * Resources with unacknoweldged adjustments indicate a
298 * failure to update labels
299 */
300 if (res->flags & DPA_RESOURCE_ADJUSTED)
301 return false;
302 count++;
303 }
304
305 /* These values match after a successful label update */
306 if (count != nsblk->num_resources)
307 return false;
308
309 for (i = 0; i < nsblk->num_resources; i++) {
310 struct resource *found = NULL;
311
312 for_each_dpa_resource(ndd, res)
313 if (res == nsblk->res[i]) {
314 found = res;
315 break;
316 }
317 /* stale resource */
318 if (!found)
319 return false;
320 }
321
322 return true;
323}
324
325resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk)
326{
327 resource_size_t size;
328
329 nvdimm_bus_lock(&nsblk->common.dev);
330 size = __nd_namespace_blk_validate(nsblk);
331 nvdimm_bus_unlock(&nsblk->common.dev);
332
333 return size;
334}
335EXPORT_SYMBOL(nd_namespace_blk_validate);
336
337
f524bf27
DW		 338static int nd_namespace_label_update(struct nd_region *nd_region,
339 struct device *dev)
340{
8c2f7e86 341 dev_WARN_ONCE(dev, dev->driver || to_ndns(dev)->claim,
f524bf27 342 "namespace must be idle during label update\n");
8c2f7e86 343 if (dev->driver || to_ndns(dev)->claim)
f524bf27
DW		 344 return 0;
345
346 /*
347 * Only allow label writes that will result in a valid namespace
348 * or deletion of an existing namespace.
349 */
350 if (is_namespace_pmem(dev)) {
351 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
0ba1c634 352 resource_size_t size = resource_size(&nspm->nsio.res);
f524bf27
DW		 353
354 if (size == 0 && nspm->uuid)
355 /* delete allocation */;
356 else if (!nspm->uuid)
357 return 0;
358
359 return nd_pmem_namespace_label_update(nd_region, nspm, size);
360 } else if (is_namespace_blk(dev)) {
0ba1c634
DW		 361 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
362 resource_size_t size = nd_namespace_blk_size(nsblk);
363
364 if (size == 0 && nsblk->uuid)
365 /* delete allocation */;
366 else if (!nsblk->uuid || !nsblk->lbasize)
367 return 0;
368
369 return nd_blk_namespace_label_update(nd_region, nsblk, size);
f524bf27
DW		 370 } else
371 return -ENXIO;
372}
373
bf9bccc1
DW		 374static ssize_t alt_name_store(struct device *dev,
375 struct device_attribute *attr, const char *buf, size_t len)
376{
f524bf27 377 struct nd_region *nd_region = to_nd_region(dev->parent);
bf9bccc1
DW		 378 ssize_t rc;
379
380 device_lock(dev);
381 nvdimm_bus_lock(dev);
382 wait_nvdimm_bus_probe_idle(dev);
383 rc = __alt_name_store(dev, buf, len);
f524bf27
DW		 384 if (rc >= 0)
385 rc = nd_namespace_label_update(nd_region, dev);
bf9bccc1
DW		 386 dev_dbg(dev, "%s: %s(%zd)\n", __func__, rc < 0 ? "fail " : "", rc);
387 nvdimm_bus_unlock(dev);
388 device_unlock(dev);
389
f524bf27 390 return rc < 0 ? rc : len;
bf9bccc1
DW		 391}
392
393static ssize_t alt_name_show(struct device *dev,
394 struct device_attribute *attr, char *buf)
395{
396 char *ns_altname;
397
398 if (is_namespace_pmem(dev)) {
399 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
400
401 ns_altname = nspm->alt_name;
402 } else if (is_namespace_blk(dev)) {
1b40e09a
DW		 403 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
404
405 ns_altname = nsblk->alt_name;
bf9bccc1
DW		 406 } else
407 return -ENXIO;
408
409 return sprintf(buf, "%s\n", ns_altname ? ns_altname : "");
410}
411static DEVICE_ATTR_RW(alt_name);
412
413static int scan_free(struct nd_region *nd_region,
414 struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
415 resource_size_t n)
416{
417 bool is_blk = strncmp(label_id->id, "blk", 3) == 0;
418 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
419 int rc = 0;
420
421 while (n) {
422 struct resource *res, *last;
423 resource_size_t new_start;
424
425 last = NULL;
426 for_each_dpa_resource(ndd, res)
427 if (strcmp(res->name, label_id->id) == 0)
428 last = res;
429 res = last;
430 if (!res)
431 return 0;
432
433 if (n >= resource_size(res)) {
434 n -= resource_size(res);
435 nd_dbg_dpa(nd_region, ndd, res, "delete %d\n", rc);
436 nvdimm_free_dpa(ndd, res);
437 /* retry with last resource deleted */
438 continue;
439 }
440
441 /*
442 * Keep BLK allocations relegated to high DPA as much as
443 * possible
444 */
445 if (is_blk)
446 new_start = res->start + n;
447 else
448 new_start = res->start;
449
450 rc = adjust_resource(res, new_start, resource_size(res) - n);
1b40e09a
DW		 451 if (rc == 0)
452 res->flags |= DPA_RESOURCE_ADJUSTED;
bf9bccc1
DW		 453 nd_dbg_dpa(nd_region, ndd, res, "shrink %d\n", rc);
454 break;
455 }
456
457 return rc;
458}
459
460/**
461 * shrink_dpa_allocation - for each dimm in region free n bytes for label_id
462 * @nd_region: the set of dimms to reclaim @n bytes from
463 * @label_id: unique identifier for the namespace consuming this dpa range
464 * @n: number of bytes per-dimm to release
465 *
466 * Assumes resources are ordered. Starting from the end try to
467 * adjust_resource() the allocation to @n, but if @n is larger than the
468 * allocation delete it and find the 'new' last allocation in the label
469 * set.
470 */
471static int shrink_dpa_allocation(struct nd_region *nd_region,
472 struct nd_label_id *label_id, resource_size_t n)
473{
474 int i;
475
476 for (i = 0; i < nd_region->ndr_mappings; i++) {
477 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
478 int rc;
479
480 rc = scan_free(nd_region, nd_mapping, label_id, n);
481 if (rc)
482 return rc;
483 }
484
485 return 0;
486}
487
488static resource_size_t init_dpa_allocation(struct nd_label_id *label_id,
489 struct nd_region *nd_region, struct nd_mapping *nd_mapping,
490 resource_size_t n)
491{
492 bool is_blk = strncmp(label_id->id, "blk", 3) == 0;
493 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
494 resource_size_t first_dpa;
495 struct resource *res;
496 int rc = 0;
497
498 /* allocate blk from highest dpa first */
499 if (is_blk)
500 first_dpa = nd_mapping->start + nd_mapping->size - n;
501 else
502 first_dpa = nd_mapping->start;
503
504 /* first resource allocation for this label-id or dimm */
505 res = nvdimm_allocate_dpa(ndd, label_id, first_dpa, n);
506 if (!res)
507 rc = -EBUSY;
508
509 nd_dbg_dpa(nd_region, ndd, res, "init %d\n", rc);
510 return rc ? n : 0;
511}
512
1b40e09a
DW		 513static bool space_valid(bool is_pmem, bool is_reserve,
514 struct nd_label_id *label_id, struct resource *res)
bf9bccc1
DW		 515{
516 /*
517 * For BLK-space any space is valid, for PMEM-space, it must be
1b40e09a
DW		 518 * contiguous with an existing allocation unless we are
519 * reserving pmem.
bf9bccc1 520 */
1b40e09a 521 if (is_reserve || !is_pmem)
bf9bccc1
DW		 522 return true;
523 if (!res || strcmp(res->name, label_id->id) == 0)
524 return true;
525 return false;
526}
527
528enum alloc_loc {
529 ALLOC_ERR = 0, ALLOC_BEFORE, ALLOC_MID, ALLOC_AFTER,
530};
531
532static resource_size_t scan_allocate(struct nd_region *nd_region,
533 struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
534 resource_size_t n)
535{
536 resource_size_t mapping_end = nd_mapping->start + nd_mapping->size - 1;
1b40e09a 537 bool is_reserve = strcmp(label_id->id, "pmem-reserve") == 0;
bf9bccc1
DW		 538 bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
539 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
540 const resource_size_t to_allocate = n;
541 struct resource *res;
542 int first;
543
544 retry:
545 first = 0;
546 for_each_dpa_resource(ndd, res) {
547 resource_size_t allocate, available = 0, free_start, free_end;
548 struct resource *next = res->sibling, *new_res = NULL;
549 enum alloc_loc loc = ALLOC_ERR;
550 const char *action;
551 int rc = 0;
552
553 /* ignore resources outside this nd_mapping */
554 if (res->start > mapping_end)
555 continue;
556 if (res->end < nd_mapping->start)
557 continue;
558
559 /* space at the beginning of the mapping */
560 if (!first++ && res->start > nd_mapping->start) {
561 free_start = nd_mapping->start;
562 available = res->start - free_start;
1b40e09a 563 if (space_valid(is_pmem, is_reserve, label_id, NULL))
bf9bccc1
DW		 564 loc = ALLOC_BEFORE;
565 }
566
567 /* space between allocations */
568 if (!loc && next) {
569 free_start = res->start + resource_size(res);
570 free_end = min(mapping_end, next->start - 1);
1b40e09a 571 if (space_valid(is_pmem, is_reserve, label_id, res)
bf9bccc1
DW		 572 && free_start < free_end) {
573 available = free_end + 1 - free_start;
574 loc = ALLOC_MID;
575 }
576 }
577
578 /* space at the end of the mapping */
579 if (!loc && !next) {
580 free_start = res->start + resource_size(res);
581 free_end = mapping_end;
1b40e09a 582 if (space_valid(is_pmem, is_reserve, label_id, res)
bf9bccc1
DW		 583 && free_start < free_end) {
584 available = free_end + 1 - free_start;
585 loc = ALLOC_AFTER;
586 }
587 }
588
589 if (!loc || !available)
590 continue;
591 allocate = min(available, n);
592 switch (loc) {
593 case ALLOC_BEFORE:
594 if (strcmp(res->name, label_id->id) == 0) {
595 /* adjust current resource up */
1b40e09a 596 if (is_pmem && !is_reserve)
bf9bccc1
DW		 597 return n;
598 rc = adjust_resource(res, res->start - allocate,
599 resource_size(res) + allocate);
600 action = "cur grow up";
601 } else
602 action = "allocate";
603 break;
604 case ALLOC_MID:
605 if (strcmp(next->name, label_id->id) == 0) {
606 /* adjust next resource up */
1b40e09a 607 if (is_pmem && !is_reserve)
bf9bccc1
DW		 608 return n;
609 rc = adjust_resource(next, next->start
610 - allocate, resource_size(next)
611 + allocate);
612 new_res = next;
613 action = "next grow up";
614 } else if (strcmp(res->name, label_id->id) == 0) {
615 action = "grow down";
616 } else
617 action = "allocate";
618 break;
619 case ALLOC_AFTER:
620 if (strcmp(res->name, label_id->id) == 0)
621 action = "grow down";
622 else
623 action = "allocate";
624 break;
625 default:
626 return n;
627 }
628
629 if (strcmp(action, "allocate") == 0) {
630 /* BLK allocate bottom up */
631 if (!is_pmem)
632 free_start += available - allocate;
1b40e09a 633 else if (!is_reserve && free_start != nd_mapping->start)
bf9bccc1
DW		 634 return n;
635
636 new_res = nvdimm_allocate_dpa(ndd, label_id,
637 free_start, allocate);
638 if (!new_res)
639 rc = -EBUSY;
640 } else if (strcmp(action, "grow down") == 0) {
641 /* adjust current resource down */
642 rc = adjust_resource(res, res->start, resource_size(res)
643 + allocate);
1b40e09a
DW		 644 if (rc == 0)
645 res->flags |= DPA_RESOURCE_ADJUSTED;
bf9bccc1
DW		 646 }
647
648 if (!new_res)
649 new_res = res;
650
651 nd_dbg_dpa(nd_region, ndd, new_res, "%s(%d) %d\n",
652 action, loc, rc);
653
654 if (rc)
655 return n;
656
657 n -= allocate;
658 if (n) {
659 /*
660 * Retry scan with newly inserted resources.
661 * For example, if we did an ALLOC_BEFORE
662 * insertion there may also have been space
663 * available for an ALLOC_AFTER insertion, so we
664 * need to check this same resource again
665 */
666 goto retry;
667 } else
668 return 0;
669 }
670
1b40e09a
DW		 671 /*
672 * If we allocated nothing in the BLK case it may be because we are in
673 * an initial "pmem-reserve pass". Only do an initial BLK allocation
674 * when none of the DPA space is reserved.
675 */
676 if ((is_pmem || !ndd->dpa.child) && n == to_allocate)
bf9bccc1
DW		 677 return init_dpa_allocation(label_id, nd_region, nd_mapping, n);
678 return n;
679}
680
1b40e09a
DW		 681static int merge_dpa(struct nd_region *nd_region,
682 struct nd_mapping *nd_mapping, struct nd_label_id *label_id)
683{
684 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
685 struct resource *res;
686
687 if (strncmp("pmem", label_id->id, 4) == 0)
688 return 0;
689 retry:
690 for_each_dpa_resource(ndd, res) {
691 int rc;
692 struct resource *next = res->sibling;
693 resource_size_t end = res->start + resource_size(res);
694
695 if (!next || strcmp(res->name, label_id->id) != 0
696 || strcmp(next->name, label_id->id) != 0
697 || end != next->start)
698 continue;
699 end += resource_size(next);
700 nvdimm_free_dpa(ndd, next);
701 rc = adjust_resource(res, res->start, end - res->start);
702 nd_dbg_dpa(nd_region, ndd, res, "merge %d\n", rc);
703 if (rc)
704 return rc;
705 res->flags |= DPA_RESOURCE_ADJUSTED;
706 goto retry;
707 }
708
709 return 0;
710}
711
712static int __reserve_free_pmem(struct device *dev, void *data)
713{
714 struct nvdimm *nvdimm = data;
715 struct nd_region *nd_region;
716 struct nd_label_id label_id;
717 int i;
718
719 if (!is_nd_pmem(dev))
720 return 0;
721
722 nd_region = to_nd_region(dev);
723 if (nd_region->ndr_mappings == 0)
724 return 0;
725
726 memset(&label_id, 0, sizeof(label_id));
727 strcat(label_id.id, "pmem-reserve");
728 for (i = 0; i < nd_region->ndr_mappings; i++) {
729 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
730 resource_size_t n, rem = 0;
731
732 if (nd_mapping->nvdimm != nvdimm)
733 continue;
734
735 n = nd_pmem_available_dpa(nd_region, nd_mapping, &rem);
736 if (n == 0)
737 return 0;
738 rem = scan_allocate(nd_region, nd_mapping, &label_id, n);
739 dev_WARN_ONCE(&nd_region->dev, rem,
740 "pmem reserve underrun: %#llx of %#llx bytes\n",
741 (unsigned long long) n - rem,
742 (unsigned long long) n);
743 return rem ? -ENXIO : 0;
744 }
745
746 return 0;
747}
748
749static void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
750 struct nd_mapping *nd_mapping)
751{
752 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
753 struct resource *res, *_res;
754
755 for_each_dpa_resource_safe(ndd, res, _res)
756 if (strcmp(res->name, "pmem-reserve") == 0)
757 nvdimm_free_dpa(ndd, res);
758}
759
760static int reserve_free_pmem(struct nvdimm_bus *nvdimm_bus,
761 struct nd_mapping *nd_mapping)
762{
763 struct nvdimm *nvdimm = nd_mapping->nvdimm;
764 int rc;
765
766 rc = device_for_each_child(&nvdimm_bus->dev, nvdimm,
767 __reserve_free_pmem);
768 if (rc)
769 release_free_pmem(nvdimm_bus, nd_mapping);
770 return rc;
771}
772
bf9bccc1
DW		 773/**
774 * grow_dpa_allocation - for each dimm allocate n bytes for @label_id
775 * @nd_region: the set of dimms to allocate @n more bytes from
776 * @label_id: unique identifier for the namespace consuming this dpa range
777 * @n: number of bytes per-dimm to add to the existing allocation
778 *
779 * Assumes resources are ordered. For BLK regions, first consume
780 * BLK-only available DPA free space, then consume PMEM-aliased DPA
781 * space starting at the highest DPA. For PMEM regions start
782 * allocations from the start of an interleave set and end at the first
783 * BLK allocation or the end of the interleave set, whichever comes
784 * first.
785 */
786static int grow_dpa_allocation(struct nd_region *nd_region,
787 struct nd_label_id *label_id, resource_size_t n)
788{
1b40e09a
DW		 789 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
790 bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
bf9bccc1
DW		 791 int i;
792
793 for (i = 0; i < nd_region->ndr_mappings; i++) {
794 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1b40e09a
DW		 795 resource_size_t rem = n;
796 int rc, j;
797
798 /*
799 * In the BLK case try once with all unallocated PMEM
800 * reserved, and once without
801 */
802 for (j = is_pmem; j < 2; j++) {
803 bool blk_only = j == 0;
804
805 if (blk_only) {
806 rc = reserve_free_pmem(nvdimm_bus, nd_mapping);
807 if (rc)
808 return rc;
809 }
810 rem = scan_allocate(nd_region, nd_mapping,
811 label_id, rem);
812 if (blk_only)
813 release_free_pmem(nvdimm_bus, nd_mapping);
bf9bccc1 814
1b40e09a
DW		 815 /* try again and allow encroachments into PMEM */
816 if (rem == 0)
817 break;
818 }
819
820 dev_WARN_ONCE(&nd_region->dev, rem,
821 "allocation underrun: %#llx of %#llx bytes\n",
822 (unsigned long long) n - rem,
823 (unsigned long long) n);
824 if (rem)
825 return -ENXIO;
826
827 rc = merge_dpa(nd_region, nd_mapping, label_id);
bf9bccc1
DW		 828 if (rc)
829 return rc;
830 }
831
832 return 0;
833}
834
835static void nd_namespace_pmem_set_size(struct nd_region *nd_region,
836 struct nd_namespace_pmem *nspm, resource_size_t size)
837{
838 struct resource *res = &nspm->nsio.res;
839
840 res->start = nd_region->ndr_start;
841 res->end = nd_region->ndr_start + size - 1;
842}
843
bd26d0d0
DK		 844static bool uuid_not_set(const u8 *uuid, struct device *dev, const char *where)
845{
846 if (!uuid) {
847 dev_dbg(dev, "%s: uuid not set\n", where);
848 return true;
849 }
850 return false;
851}
852
bf9bccc1
DW		 853static ssize_t __size_store(struct device *dev, unsigned long long val)
854{
855 resource_size_t allocated = 0, available = 0;
856 struct nd_region *nd_region = to_nd_region(dev->parent);
857 struct nd_mapping *nd_mapping;
858 struct nvdimm_drvdata *ndd;
859 struct nd_label_id label_id;
860 u32 flags = 0, remainder;
861 u8 *uuid = NULL;
862 int rc, i;
863
8c2f7e86 864 if (dev->driver || to_ndns(dev)->claim)
bf9bccc1
DW		 865 return -EBUSY;
866
867 if (is_namespace_pmem(dev)) {
868 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
869
870 uuid = nspm->uuid;
871 } else if (is_namespace_blk(dev)) {
1b40e09a
DW		 872 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
873
874 uuid = nsblk->uuid;
875 flags = NSLABEL_FLAG_LOCAL;
bf9bccc1
DW		 876 }
877
878 /*
879 * We need a uuid for the allocation-label and dimm(s) on which
880 * to store the label.
881 */
bd26d0d0 882 if (uuid_not_set(uuid, dev, __func__))
bf9bccc1 883 return -ENXIO;
bd26d0d0
DK		 884 if (nd_region->ndr_mappings == 0) {
885 dev_dbg(dev, "%s: not associated with dimm(s)\n", __func__);
886 return -ENXIO;
887 }
bf9bccc1
DW		 888
889 div_u64_rem(val, SZ_4K * nd_region->ndr_mappings, &remainder);
890 if (remainder) {
891 dev_dbg(dev, "%llu is not %dK aligned\n", val,
892 (SZ_4K * nd_region->ndr_mappings) / SZ_1K);
893 return -EINVAL;
894 }
895
896 nd_label_gen_id(&label_id, uuid, flags);
897 for (i = 0; i < nd_region->ndr_mappings; i++) {
898 nd_mapping = &nd_region->mapping[i];
899 ndd = to_ndd(nd_mapping);
900
901 /*
902 * All dimms in an interleave set, or the base dimm for a blk
903 * region, need to be enabled for the size to be changed.
904 */
905 if (!ndd)
906 return -ENXIO;
907
908 allocated += nvdimm_allocated_dpa(ndd, &label_id);
909 }
910 available = nd_region_available_dpa(nd_region);
911
912 if (val > available + allocated)
913 return -ENOSPC;
914
915 if (val == allocated)
916 return 0;
917
918 val = div_u64(val, nd_region->ndr_mappings);
919 allocated = div_u64(allocated, nd_region->ndr_mappings);
920 if (val < allocated)
921 rc = shrink_dpa_allocation(nd_region, &label_id,
922 allocated - val);
923 else
924 rc = grow_dpa_allocation(nd_region, &label_id, val - allocated);
925
926 if (rc)
927 return rc;
928
929 if (is_namespace_pmem(dev)) {
930 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
931
932 nd_namespace_pmem_set_size(nd_region, nspm,
933 val * nd_region->ndr_mappings);
1b40e09a 934 } else if (is_namespace_blk(dev)) {
8c2f7e86
DW		 935 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
936
1b40e09a
DW		 937 /*
938 * Try to delete the namespace if we deleted all of its
8c2f7e86
DW		 939 * allocation, this is not the seed device for the
940 * region, and it is not actively claimed by a btt
941 * instance.
1b40e09a 942 */
8c2f7e86
DW		 943 if (val == 0 && nd_region->ns_seed != dev
944 && !nsblk->common.claim)
1b40e09a 945 nd_device_unregister(dev, ND_ASYNC);
bf9bccc1
DW		 946 }
947
948 return rc;
949}
950
951static ssize_t size_store(struct device *dev,
952 struct device_attribute *attr, const char *buf, size_t len)
953{
f524bf27 954 struct nd_region *nd_region = to_nd_region(dev->parent);
bf9bccc1
DW		 955 unsigned long long val;
956 u8 **uuid = NULL;
957 int rc;
958
959 rc = kstrtoull(buf, 0, &val);
960 if (rc)
961 return rc;
962
963 device_lock(dev);
964 nvdimm_bus_lock(dev);
965 wait_nvdimm_bus_probe_idle(dev);
966 rc = __size_store(dev, val);
f524bf27
DW		 967 if (rc >= 0)
968 rc = nd_namespace_label_update(nd_region, dev);
bf9bccc1
DW		 969
970 if (is_namespace_pmem(dev)) {
971 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
972
973 uuid = &nspm->uuid;
974 } else if (is_namespace_blk(dev)) {
1b40e09a
DW		 975 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
976
977 uuid = &nsblk->uuid;
bf9bccc1
DW		 978 }
979
980 if (rc == 0 && val == 0 && uuid) {
981 /* setting size zero == 'delete namespace' */
982 kfree(*uuid);
983 *uuid = NULL;
984 }
985
986 dev_dbg(dev, "%s: %llx %s (%d)\n", __func__, val, rc < 0
987 ? "fail" : "success", rc);
988
989 nvdimm_bus_unlock(dev);
990 device_unlock(dev);
991
f524bf27 992 return rc < 0 ? rc : len;
bf9bccc1
DW		 993}
994
8c2f7e86 995resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
bf9bccc1 996{
8c2f7e86 997 struct device *dev = &ndns->dev;
1b40e09a 998
bf9bccc1
DW		 999 if (is_namespace_pmem(dev)) {
1000 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1001
8c2f7e86 1002 return resource_size(&nspm->nsio.res);
bf9bccc1 1003 } else if (is_namespace_blk(dev)) {
8c2f7e86 1004 return nd_namespace_blk_size(to_nd_namespace_blk(dev));
bf9bccc1
DW		 1005 } else if (is_namespace_io(dev)) {
1006 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
1007
8c2f7e86
DW		 1008 return resource_size(&nsio->res);
1009 } else
1010 WARN_ONCE(1, "unknown namespace type\n");
1011 return 0;
1012}
1013
1014resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1015{
1016 resource_size_t size;
1b40e09a 1017
8c2f7e86
DW		 1018 nvdimm_bus_lock(&ndns->dev);
1019 size = __nvdimm_namespace_capacity(ndns);
1020 nvdimm_bus_unlock(&ndns->dev);
1021
1022 return size;
1023}
1024EXPORT_SYMBOL(nvdimm_namespace_capacity);
1025
1026static ssize_t size_show(struct device *dev,
1027 struct device_attribute *attr, char *buf)
1028{
1029 return sprintf(buf, "%llu\n", (unsigned long long)
1030 nvdimm_namespace_capacity(to_ndns(dev)));
bf9bccc1
DW		 1031}
1032static DEVICE_ATTR(size, S_IRUGO, size_show, size_store);
1033
1034static ssize_t uuid_show(struct device *dev,
1035 struct device_attribute *attr, char *buf)
1036{
1037 u8 *uuid;
1038
1039 if (is_namespace_pmem(dev)) {
1040 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1041
1042 uuid = nspm->uuid;
1043 } else if (is_namespace_blk(dev)) {
1b40e09a
DW		 1044 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1045
1046 uuid = nsblk->uuid;
bf9bccc1
DW		 1047 } else
1048 return -ENXIO;
1049
1050 if (uuid)
1051 return sprintf(buf, "%pUb\n", uuid);
1052 return sprintf(buf, "\n");
1053}
1054
1055/**
1056 * namespace_update_uuid - check for a unique uuid and whether we're "renaming"
1057 * @nd_region: parent region so we can updates all dimms in the set
1058 * @dev: namespace type for generating label_id
1059 * @new_uuid: incoming uuid
1060 * @old_uuid: reference to the uuid storage location in the namespace object
1061 */
1062static int namespace_update_uuid(struct nd_region *nd_region,
1063 struct device *dev, u8 *new_uuid, u8 **old_uuid)
1064{
1065 u32 flags = is_namespace_blk(dev) ? NSLABEL_FLAG_LOCAL : 0;
1066 struct nd_label_id old_label_id;
1067 struct nd_label_id new_label_id;
f524bf27 1068 int i;
bf9bccc1 1069
f524bf27
DW		 1070 if (!nd_is_uuid_unique(dev, new_uuid))
1071 return -EINVAL;
bf9bccc1
DW		 1072
1073 if (*old_uuid == NULL)
1074 goto out;
1075
f524bf27
DW		 1076 /*
1077 * If we've already written a label with this uuid, then it's
1078 * too late to rename because we can't reliably update the uuid
1079 * without losing the old namespace. Userspace must delete this
1080 * namespace to abandon the old uuid.
1081 */
1082 for (i = 0; i < nd_region->ndr_mappings; i++) {
1083 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1084
1085 /*
1086 * This check by itself is sufficient because old_uuid
1087 * would be NULL above if this uuid did not exist in the
1088 * currently written set.
1089 *
1090 * FIXME: can we delete uuid with zero dpa allocated?
1091 */
1092 if (nd_mapping->labels)
1093 return -EBUSY;
1094 }
1095
bf9bccc1
DW		 1096 nd_label_gen_id(&old_label_id, *old_uuid, flags);
1097 nd_label_gen_id(&new_label_id, new_uuid, flags);
1098 for (i = 0; i < nd_region->ndr_mappings; i++) {
1099 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1100 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1101 struct resource *res;
1102
1103 for_each_dpa_resource(ndd, res)
1104 if (strcmp(res->name, old_label_id.id) == 0)
1105 sprintf((void *) res->name, "%s",
1106 new_label_id.id);
1107 }
1108 kfree(*old_uuid);
1109 out:
1110 *old_uuid = new_uuid;
1111 return 0;
1112}
1113
1114static ssize_t uuid_store(struct device *dev,
1115 struct device_attribute *attr, const char *buf, size_t len)
1116{
1117 struct nd_region *nd_region = to_nd_region(dev->parent);
1118 u8 *uuid = NULL;
8c2f7e86 1119 ssize_t rc = 0;
bf9bccc1 1120 u8 **ns_uuid;
bf9bccc1
DW		 1121
1122 if (is_namespace_pmem(dev)) {
1123 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1124
1125 ns_uuid = &nspm->uuid;
1126 } else if (is_namespace_blk(dev)) {
1b40e09a
DW		 1127 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1128
1129 ns_uuid = &nsblk->uuid;
bf9bccc1
DW		 1130 } else
1131 return -ENXIO;
1132
1133 device_lock(dev);
1134 nvdimm_bus_lock(dev);
1135 wait_nvdimm_bus_probe_idle(dev);
8c2f7e86
DW		 1136 if (to_ndns(dev)->claim)
1137 rc = -EBUSY;
1138 if (rc >= 0)
1139 rc = nd_uuid_store(dev, &uuid, buf, len);
bf9bccc1
DW		 1140 if (rc >= 0)
1141 rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid);
f524bf27
DW		 1142 if (rc >= 0)
1143 rc = nd_namespace_label_update(nd_region, dev);
1144 else
1145 kfree(uuid);
bf9bccc1
DW		 1146 dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
1147 rc, buf, buf[len - 1] == '\n' ? "" : "\n");
1148 nvdimm_bus_unlock(dev);
1149 device_unlock(dev);
1150
f524bf27 1151 return rc < 0 ? rc : len;
bf9bccc1
DW		 1152}
1153static DEVICE_ATTR_RW(uuid);
1154
1155static ssize_t resource_show(struct device *dev,
1156 struct device_attribute *attr, char *buf)
1157{
1158 struct resource *res;
1159
1160 if (is_namespace_pmem(dev)) {
1161 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1162
1163 res = &nspm->nsio.res;
1164 } else if (is_namespace_io(dev)) {
1165 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
1166
1167 res = &nsio->res;
1168 } else
1169 return -ENXIO;
1170
1171 /* no address to convey if the namespace has no allocation */
1172 if (resource_size(res) == 0)
1173 return -ENXIO;
1174 return sprintf(buf, "%#llx\n", (unsigned long long) res->start);
1175}
1176static DEVICE_ATTR_RO(resource);
1177
fcae6957
VV		 1178static const unsigned long ns_lbasize_supported[] = { 512, 520, 528,
1179 4096, 4104, 4160, 4224, 0 };
1b40e09a
DW		 1180
1181static ssize_t sector_size_show(struct device *dev,
1182 struct device_attribute *attr, char *buf)
1183{
1184 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1185
1186 if (!is_namespace_blk(dev))
1187 return -ENXIO;
1188
1189 return nd_sector_size_show(nsblk->lbasize, ns_lbasize_supported, buf);
1190}
1191
1192static ssize_t sector_size_store(struct device *dev,
1193 struct device_attribute *attr, const char *buf, size_t len)
1194{
1195 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
f524bf27 1196 struct nd_region *nd_region = to_nd_region(dev->parent);
8c2f7e86 1197 ssize_t rc = 0;
1b40e09a
DW		 1198
1199 if (!is_namespace_blk(dev))
1200 return -ENXIO;
1201
1202 device_lock(dev);
1203 nvdimm_bus_lock(dev);
8c2f7e86
DW		 1204 if (to_ndns(dev)->claim)
1205 rc = -EBUSY;
1206 if (rc >= 0)
1207 rc = nd_sector_size_store(dev, buf, &nsblk->lbasize,
1208 ns_lbasize_supported);
f524bf27
DW		 1209 if (rc >= 0)
1210 rc = nd_namespace_label_update(nd_region, dev);
1211 dev_dbg(dev, "%s: result: %zd %s: %s%s", __func__,
1212 rc, rc < 0 ? "tried" : "wrote", buf,
1213 buf[len - 1] == '\n' ? "" : "\n");
1b40e09a
DW		 1214 nvdimm_bus_unlock(dev);
1215 device_unlock(dev);
1216
1217 return rc ? rc : len;
1218}
1219static DEVICE_ATTR_RW(sector_size);
1220
0ba1c634
DW		 1221static ssize_t dpa_extents_show(struct device *dev,
1222 struct device_attribute *attr, char *buf)
1223{
1224 struct nd_region *nd_region = to_nd_region(dev->parent);
1225 struct nd_label_id label_id;
1226 int count = 0, i;
1227 u8 *uuid = NULL;
1228 u32 flags = 0;
1229
1230 nvdimm_bus_lock(dev);
1231 if (is_namespace_pmem(dev)) {
1232 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1233
1234 uuid = nspm->uuid;
1235 flags = 0;
1236 } else if (is_namespace_blk(dev)) {
1237 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1238
1239 uuid = nsblk->uuid;
1240 flags = NSLABEL_FLAG_LOCAL;
1241 }
1242
1243 if (!uuid)
1244 goto out;
1245
1246 nd_label_gen_id(&label_id, uuid, flags);
1247 for (i = 0; i < nd_region->ndr_mappings; i++) {
1248 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1249 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1250 struct resource *res;
1251
1252 for_each_dpa_resource(ndd, res)
1253 if (strcmp(res->name, label_id.id) == 0)
1254 count++;
1255 }
1256 out:
1257 nvdimm_bus_unlock(dev);
1258
1259 return sprintf(buf, "%d\n", count);
1260}
1261static DEVICE_ATTR_RO(dpa_extents);
1262
8c2f7e86
DW		 1263static ssize_t holder_show(struct device *dev,
1264 struct device_attribute *attr, char *buf)
1265{
1266 struct nd_namespace_common *ndns = to_ndns(dev);
1267 ssize_t rc;
1268
1269 device_lock(dev);
1270 rc = sprintf(buf, "%s\n", ndns->claim ? dev_name(ndns->claim) : "");
1271 device_unlock(dev);
1272
1273 return rc;
1274}
1275static DEVICE_ATTR_RO(holder);
1276
0731de0d
DW		 1277static ssize_t mode_show(struct device *dev,
1278 struct device_attribute *attr, char *buf)
1279{
1280 struct nd_namespace_common *ndns = to_ndns(dev);
1281 struct device *claim;
1282 char *mode;
1283 ssize_t rc;
1284
1285 device_lock(dev);
1286 claim = ndns->claim;
9c412428 1287 if (claim && is_nd_btt(claim))
0731de0d 1288 mode = "safe";
9c412428
DW		 1289 else if (claim && is_nd_pfn(claim))
1290 mode = "memory";
1291 else if (!claim && pmem_should_map_pages(dev))
1292 mode = "memory";
0731de0d
DW		 1293 else
1294 mode = "raw";
1295 rc = sprintf(buf, "%s\n", mode);
1296 device_unlock(dev);
1297
1298 return rc;
1299}
1300static DEVICE_ATTR_RO(mode);
1301
8c2f7e86
DW		 1302static ssize_t force_raw_store(struct device *dev,
1303 struct device_attribute *attr, const char *buf, size_t len)
1304{
1305 bool force_raw;
1306 int rc = strtobool(buf, &force_raw);
1307
1308 if (rc)
1309 return rc;
1310
1311 to_ndns(dev)->force_raw = force_raw;
1312 return len;
1313}
1314
1315static ssize_t force_raw_show(struct device *dev,
1316 struct device_attribute *attr, char *buf)
1317{
1318 return sprintf(buf, "%d\n", to_ndns(dev)->force_raw);
1319}
1320static DEVICE_ATTR_RW(force_raw);
1321
3d88002e
DW		 1322static struct attribute *nd_namespace_attributes[] = {
1323 &dev_attr_nstype.attr,
bf9bccc1 1324 &dev_attr_size.attr,
0731de0d 1325 &dev_attr_mode.attr,
bf9bccc1 1326 &dev_attr_uuid.attr,
8c2f7e86 1327 &dev_attr_holder.attr,
bf9bccc1
DW		 1328 &dev_attr_resource.attr,
1329 &dev_attr_alt_name.attr,
8c2f7e86 1330 &dev_attr_force_raw.attr,
1b40e09a 1331 &dev_attr_sector_size.attr,
0ba1c634 1332 &dev_attr_dpa_extents.attr,
3d88002e
DW		 1333 NULL,
1334};
1335
bf9bccc1
DW		 1336static umode_t namespace_visible(struct kobject *kobj,
1337 struct attribute *a, int n)
1338{
1339 struct device *dev = container_of(kobj, struct device, kobj);
1340
1341 if (a == &dev_attr_resource.attr) {
1342 if (is_namespace_blk(dev))
1343 return 0;
1344 return a->mode;
1345 }
1346
1347 if (is_namespace_pmem(dev) || is_namespace_blk(dev)) {
1348 if (a == &dev_attr_size.attr)
1349 return S_IWUSR | S_IRUGO;
1b40e09a
DW		 1350
1351 if (is_namespace_pmem(dev) && a == &dev_attr_sector_size.attr)
1352 return 0;
1353
bf9bccc1
DW		 1354 return a->mode;
1355 }
1356
8c2f7e86
DW		 1357 if (a == &dev_attr_nstype.attr || a == &dev_attr_size.attr
1358 || a == &dev_attr_holder.attr
0731de0d
DW		 1359 || a == &dev_attr_force_raw.attr
1360 || a == &dev_attr_mode.attr)
bf9bccc1
DW		 1361 return a->mode;
1362
1363 return 0;
1364}
1365
3d88002e
DW		 1366static struct attribute_group nd_namespace_attribute_group = {
1367 .attrs = nd_namespace_attributes,
bf9bccc1 1368 .is_visible = namespace_visible,
3d88002e
DW		 1369};
1370
1371static const struct attribute_group *nd_namespace_attribute_groups[] = {
1372 &nd_device_attribute_group,
1373 &nd_namespace_attribute_group,
74ae66c3 1374 &nd_numa_attribute_group,
3d88002e
DW		 1375 NULL,
1376};
1377
8c2f7e86
DW		 1378struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev)
1379{
1380 struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL;
e1455744 1381 struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL;
0bfb8dd3 1382 struct nd_namespace_common *ndns = NULL;
8c2f7e86
DW		 1383 resource_size_t size;
1384
e1455744 1385 if (nd_btt || nd_pfn) {
0bfb8dd3 1386 if (nd_btt)
e1455744 1387 ndns = nd_btt->ndns;
0bfb8dd3 1388 else if (nd_pfn)
e1455744 1389 ndns = nd_pfn->ndns;
e1455744 1390
0bfb8dd3 1391 if (!ndns)
8c2f7e86
DW		 1392 return ERR_PTR(-ENODEV);
1393
1394 /*
1395 * Flush any in-progess probes / removals in the driver
1396 * for the raw personality of this namespace.
1397 */
1398 device_lock(&ndns->dev);
1399 device_unlock(&ndns->dev);
1400 if (ndns->dev.driver) {
1401 dev_dbg(&ndns->dev, "is active, can't bind %s\n",
0bfb8dd3 1402 dev_name(dev));
8c2f7e86
DW		 1403 return ERR_PTR(-EBUSY);
1404 }
0bfb8dd3 1405 if (dev_WARN_ONCE(&ndns->dev, ndns->claim != dev,
8c2f7e86 1406 "host (%s) vs claim (%s) mismatch\n",
0bfb8dd3 1407 dev_name(dev),
8c2f7e86
DW		 1408 dev_name(ndns->claim)))
1409 return ERR_PTR(-ENXIO);
1410 } else {
1411 ndns = to_ndns(dev);
1412 if (ndns->claim) {
1413 dev_dbg(dev, "claimed by %s, failing probe\n",
1414 dev_name(ndns->claim));
1415
1416 return ERR_PTR(-ENXIO);
1417 }
1418 }
1419
1420 size = nvdimm_namespace_capacity(ndns);
1421 if (size < ND_MIN_NAMESPACE_SIZE) {
1422 dev_dbg(&ndns->dev, "%pa, too small must be at least %#x\n",
1423 &size, ND_MIN_NAMESPACE_SIZE);
1424 return ERR_PTR(-ENODEV);
1425 }
1426
1427 if (is_namespace_pmem(&ndns->dev)) {
1428 struct nd_namespace_pmem *nspm;
1429
1430 nspm = to_nd_namespace_pmem(&ndns->dev);
bd26d0d0 1431 if (uuid_not_set(nspm->uuid, &ndns->dev, __func__))
8c2f7e86 1432 return ERR_PTR(-ENODEV);
8c2f7e86 1433 } else if (is_namespace_blk(&ndns->dev)) {
047fc8a1
RZ		 1434 struct nd_namespace_blk *nsblk;
1435
1436 nsblk = to_nd_namespace_blk(&ndns->dev);
bd26d0d0
DK		 1437 if (uuid_not_set(nsblk->uuid, &ndns->dev, __func__))
1438 return ERR_PTR(-ENODEV);
1439 if (!nsblk->lbasize) {
1440 dev_dbg(&ndns->dev, "%s: sector size not set\n",
1441 __func__);
1442 return ERR_PTR(-ENODEV);
1443 }
047fc8a1
RZ		 1444 if (!nd_namespace_blk_validate(nsblk))
1445 return ERR_PTR(-ENODEV);
8c2f7e86
DW		 1446 }
1447
1448 return ndns;
1449}
1450EXPORT_SYMBOL(nvdimm_namespace_common_probe);
1451
3d88002e
DW		 1452static struct device **create_namespace_io(struct nd_region *nd_region)
1453{
1454 struct nd_namespace_io *nsio;
1455 struct device *dev, **devs;
1456 struct resource *res;
1457
1458 nsio = kzalloc(sizeof(*nsio), GFP_KERNEL);
1459 if (!nsio)
1460 return NULL;
1461
1462 devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL);
1463 if (!devs) {
1464 kfree(nsio);
1465 return NULL;
1466 }
1467
8c2f7e86 1468 dev = &nsio->common.dev;
3d88002e
DW		 1469 dev->type = &namespace_io_device_type;
1470 dev->parent = &nd_region->dev;
1471 res = &nsio->res;
1472 res->name = dev_name(&nd_region->dev);
1473 res->flags = IORESOURCE_MEM;
1474 res->start = nd_region->ndr_start;
1475 res->end = res->start + nd_region->ndr_size - 1;
1476
1477 devs[0] = dev;
1478 return devs;
1479}
1480
bf9bccc1
DW		 1481static bool has_uuid_at_pos(struct nd_region *nd_region, u8 *uuid,
1482 u64 cookie, u16 pos)
1483{
1484 struct nd_namespace_label *found = NULL;
1485 int i;
1486
1487 for (i = 0; i < nd_region->ndr_mappings; i++) {
1488 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1489 struct nd_namespace_label *nd_label;
1490 bool found_uuid = false;
1491 int l;
1492
1493 for_each_label(l, nd_label, nd_mapping->labels) {
1494 u64 isetcookie = __le64_to_cpu(nd_label->isetcookie);
1495 u16 position = __le16_to_cpu(nd_label->position);
1496 u16 nlabel = __le16_to_cpu(nd_label->nlabel);
1497
1498 if (isetcookie != cookie)
1499 continue;
1500
1501 if (memcmp(nd_label->uuid, uuid, NSLABEL_UUID_LEN) != 0)
1502 continue;
1503
1504 if (found_uuid) {
1505 dev_dbg(to_ndd(nd_mapping)->dev,
1506 "%s duplicate entry for uuid\n",
1507 __func__);
1508 return false;
1509 }
1510 found_uuid = true;
1511 if (nlabel != nd_region->ndr_mappings)
1512 continue;
1513 if (position != pos)
1514 continue;
1515 found = nd_label;
1516 break;
1517 }
1518 if (found)
1519 break;
1520 }
1521 return found != NULL;
1522}
1523
1524static int select_pmem_id(struct nd_region *nd_region, u8 *pmem_id)
1525{
1526 struct nd_namespace_label *select = NULL;
1527 int i;
1528
1529 if (!pmem_id)
1530 return -ENODEV;
1531
1532 for (i = 0; i < nd_region->ndr_mappings; i++) {
1533 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1534 struct nd_namespace_label *nd_label;
1535 u64 hw_start, hw_end, pmem_start, pmem_end;
1536 int l;
1537
1538 for_each_label(l, nd_label, nd_mapping->labels)
1539 if (memcmp(nd_label->uuid, pmem_id, NSLABEL_UUID_LEN) == 0)
1540 break;
1541
1542 if (!nd_label) {
1543 WARN_ON(1);
1544 return -EINVAL;
1545 }
1546
1547 select = nd_label;
1548 /*
1549 * Check that this label is compliant with the dpa
1550 * range published in NFIT
1551 */
1552 hw_start = nd_mapping->start;
1553 hw_end = hw_start + nd_mapping->size;
1554 pmem_start = __le64_to_cpu(select->dpa);
1555 pmem_end = pmem_start + __le64_to_cpu(select->rawsize);
1556 if (pmem_start == hw_start && pmem_end <= hw_end)
1557 /* pass */;
1558 else
1559 return -EINVAL;
1560
1561 nd_mapping->labels[0] = select;
1562 nd_mapping->labels[1] = NULL;
1563 }
1564 return 0;
1565}
1566
1567/**
1568 * find_pmem_label_set - validate interleave set labelling, retrieve label0
1569 * @nd_region: region with mappings to validate
1570 */
1571static int find_pmem_label_set(struct nd_region *nd_region,
1572 struct nd_namespace_pmem *nspm)
1573{
1574 u64 cookie = nd_region_interleave_set_cookie(nd_region);
1575 struct nd_namespace_label *nd_label;
1576 u8 select_id[NSLABEL_UUID_LEN];
1577 resource_size_t size = 0;
1578 u8 *pmem_id = NULL;
1579 int rc = -ENODEV, l;
1580 u16 i;
1581
1582 if (cookie == 0)
1583 return -ENXIO;
1584
1585 /*
1586 * Find a complete set of labels by uuid. By definition we can start
1587 * with any mapping as the reference label
1588 */
1589 for_each_label(l, nd_label, nd_region->mapping[0].labels) {
1590 u64 isetcookie = __le64_to_cpu(nd_label->isetcookie);
1591
1592 if (isetcookie != cookie)
1593 continue;
1594
1595 for (i = 0; nd_region->ndr_mappings; i++)
1596 if (!has_uuid_at_pos(nd_region, nd_label->uuid,
1597 cookie, i))
1598 break;
1599 if (i < nd_region->ndr_mappings) {
1600 /*
1601 * Give up if we don't find an instance of a
1602 * uuid at each position (from 0 to
1603 * nd_region->ndr_mappings - 1), or if we find a
1604 * dimm with two instances of the same uuid.
1605 */
1606 rc = -EINVAL;
1607 goto err;
1608 } else if (pmem_id) {
1609 /*
1610 * If there is more than one valid uuid set, we
1611 * need userspace to clean this up.
1612 */
1613 rc = -EBUSY;
1614 goto err;
1615 }
1616 memcpy(select_id, nd_label->uuid, NSLABEL_UUID_LEN);
1617 pmem_id = select_id;
1618 }
1619
1620 /*
1621 * Fix up each mapping's 'labels' to have the validated pmem label for
1622 * that position at labels[0], and NULL at labels[1]. In the process,
1623 * check that the namespace aligns with interleave-set. We know
1624 * that it does not overlap with any blk namespaces by virtue of
1625 * the dimm being enabled (i.e. nd_label_reserve_dpa()
1626 * succeeded).
1627 */
1628 rc = select_pmem_id(nd_region, pmem_id);
1629 if (rc)
1630 goto err;
1631
1632 /* Calculate total size and populate namespace properties from label0 */
1633 for (i = 0; i < nd_region->ndr_mappings; i++) {
1634 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1635 struct nd_namespace_label *label0 = nd_mapping->labels[0];
1636
1637 size += __le64_to_cpu(label0->rawsize);
1638 if (__le16_to_cpu(label0->position) != 0)
1639 continue;
1640 WARN_ON(nspm->alt_name || nspm->uuid);
1641 nspm->alt_name = kmemdup((void __force *) label0->name,
1642 NSLABEL_NAME_LEN, GFP_KERNEL);
1643 nspm->uuid = kmemdup((void __force *) label0->uuid,
1644 NSLABEL_UUID_LEN, GFP_KERNEL);
1645 }
1646
1647 if (!nspm->alt_name || !nspm->uuid) {
1648 rc = -ENOMEM;
1649 goto err;
1650 }
1651
1652 nd_namespace_pmem_set_size(nd_region, nspm, size);
1653
1654 return 0;
1655 err:
1656 switch (rc) {
1657 case -EINVAL:
1658 dev_dbg(&nd_region->dev, "%s: invalid label(s)\n", __func__);
1659 break;
1660 case -ENODEV:
1661 dev_dbg(&nd_region->dev, "%s: label not found\n", __func__);
1662 break;
1663 default:
1664 dev_dbg(&nd_region->dev, "%s: unexpected err: %d\n",
1665 __func__, rc);
1666 break;
1667 }
1668 return rc;
1669}
1670
1671static struct device **create_namespace_pmem(struct nd_region *nd_region)
1672{
1673 struct nd_namespace_pmem *nspm;
1674 struct device *dev, **devs;
1675 struct resource *res;
1676 int rc;
1677
1678 nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
1679 if (!nspm)
1680 return NULL;
1681
8c2f7e86 1682 dev = &nspm->nsio.common.dev;
bf9bccc1
DW		 1683 dev->type = &namespace_pmem_device_type;
1684 dev->parent = &nd_region->dev;
1685 res = &nspm->nsio.res;
1686 res->name = dev_name(&nd_region->dev);
1687 res->flags = IORESOURCE_MEM;
1688 rc = find_pmem_label_set(nd_region, nspm);
1689 if (rc == -ENODEV) {
1690 int i;
1691
1692 /* Pass, try to permit namespace creation... */
1693 for (i = 0; i < nd_region->ndr_mappings; i++) {
1694 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1695
1696 kfree(nd_mapping->labels);
1697 nd_mapping->labels = NULL;
1698 }
1699
1700 /* Publish a zero-sized namespace for userspace to configure. */
1701 nd_namespace_pmem_set_size(nd_region, nspm, 0);
1702
1703 rc = 0;
1704 } else if (rc)
1705 goto err;
1706
1707 devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL);
1708 if (!devs)
1709 goto err;
1710
1711 devs[0] = dev;
1712 return devs;
1713
1714 err:
8c2f7e86 1715 namespace_pmem_release(&nspm->nsio.common.dev);
bf9bccc1
DW		 1716 return NULL;
1717}
1718
1b40e09a
DW		 1719struct resource *nsblk_add_resource(struct nd_region *nd_region,
1720 struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk,
1721 resource_size_t start)
1722{
1723 struct nd_label_id label_id;
1724 struct resource *res;
1725
1726 nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
1727 res = krealloc(nsblk->res,
1728 sizeof(void *) * (nsblk->num_resources + 1),
1729 GFP_KERNEL);
1730 if (!res)
1731 return NULL;
1732 nsblk->res = (struct resource **) res;
1733 for_each_dpa_resource(ndd, res)
1734 if (strcmp(res->name, label_id.id) == 0
1735 && res->start == start) {
1736 nsblk->res[nsblk->num_resources++] = res;
1737 return res;
1738 }
1739 return NULL;
1740}
1741
1742static struct device *nd_namespace_blk_create(struct nd_region *nd_region)
1743{
1744 struct nd_namespace_blk *nsblk;
1745 struct device *dev;
1746
1747 if (!is_nd_blk(&nd_region->dev))
1748 return NULL;
1749
1750 nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
1751 if (!nsblk)
1752 return NULL;
1753
8c2f7e86 1754 dev = &nsblk->common.dev;
1b40e09a
DW		 1755 dev->type = &namespace_blk_device_type;
1756 nsblk->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
1757 if (nsblk->id < 0) {
1758 kfree(nsblk);
1759 return NULL;
1760 }
1761 dev_set_name(dev, "namespace%d.%d", nd_region->id, nsblk->id);
1762 dev->parent = &nd_region->dev;
1763 dev->groups = nd_namespace_attribute_groups;
1764
8c2f7e86 1765 return &nsblk->common.dev;
1b40e09a
DW		 1766}
1767
1768void nd_region_create_blk_seed(struct nd_region *nd_region)
1769{
1770 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
1771 nd_region->ns_seed = nd_namespace_blk_create(nd_region);
1772 /*
1773 * Seed creation failures are not fatal, provisioning is simply
1774 * disabled until memory becomes available
1775 */
1776 if (!nd_region->ns_seed)
1777 dev_err(&nd_region->dev, "failed to create blk namespace\n");
1778 else
1779 nd_device_register(nd_region->ns_seed);
1780}
1781
2dc43331
DW		 1782void nd_region_create_pfn_seed(struct nd_region *nd_region)
1783{
1784 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
1785 nd_region->pfn_seed = nd_pfn_create(nd_region);
1786 /*
1787 * Seed creation failures are not fatal, provisioning is simply
1788 * disabled until memory becomes available
1789 */
1790 if (!nd_region->pfn_seed)
1791 dev_err(&nd_region->dev, "failed to create pfn namespace\n");
1792}
1793
8c2f7e86
DW		 1794void nd_region_create_btt_seed(struct nd_region *nd_region)
1795{
1796 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
1797 nd_region->btt_seed = nd_btt_create(nd_region);
1798 /*
1799 * Seed creation failures are not fatal, provisioning is simply
1800 * disabled until memory becomes available
1801 */
1802 if (!nd_region->btt_seed)
1803 dev_err(&nd_region->dev, "failed to create btt namespace\n");
1804}
1805
1b40e09a
DW		 1806static struct device **create_namespace_blk(struct nd_region *nd_region)
1807{
1808 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
1809 struct nd_namespace_label *nd_label;
1810 struct device *dev, **devs = NULL;
1811 struct nd_namespace_blk *nsblk;
1812 struct nvdimm_drvdata *ndd;
1813 int i, l, count = 0;
1814 struct resource *res;
1815
1816 if (nd_region->ndr_mappings == 0)
1817 return NULL;
1818
1819 ndd = to_ndd(nd_mapping);
1820 for_each_label(l, nd_label, nd_mapping->labels) {
1821 u32 flags = __le32_to_cpu(nd_label->flags);
1822 char *name[NSLABEL_NAME_LEN];
1823 struct device **__devs;
1824
1825 if (flags & NSLABEL_FLAG_LOCAL)
1826 /* pass */;
1827 else
1828 continue;
1829
1830 for (i = 0; i < count; i++) {
1831 nsblk = to_nd_namespace_blk(devs[i]);
1832 if (memcmp(nsblk->uuid, nd_label->uuid,
1833 NSLABEL_UUID_LEN) == 0) {
1834 res = nsblk_add_resource(nd_region, ndd, nsblk,
1835 __le64_to_cpu(nd_label->dpa));
1836 if (!res)
1837 goto err;
1838 nd_dbg_dpa(nd_region, ndd, res, "%s assign\n",
8c2f7e86 1839 dev_name(&nsblk->common.dev));
1b40e09a
DW		 1840 break;
1841 }
1842 }
1843 if (i < count)
1844 continue;
1845 __devs = kcalloc(count + 2, sizeof(dev), GFP_KERNEL);
1846 if (!__devs)
1847 goto err;
1848 memcpy(__devs, devs, sizeof(dev) * count);
1849 kfree(devs);
1850 devs = __devs;
1851
1852 nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
1853 if (!nsblk)
1854 goto err;
8c2f7e86 1855 dev = &nsblk->common.dev;
1b40e09a
DW		 1856 dev->type = &namespace_blk_device_type;
1857 dev->parent = &nd_region->dev;
1858 dev_set_name(dev, "namespace%d.%d", nd_region->id, count);
1859 devs[count++] = dev;
1860 nsblk->id = -1;
1861 nsblk->lbasize = __le64_to_cpu(nd_label->lbasize);
1862 nsblk->uuid = kmemdup(nd_label->uuid, NSLABEL_UUID_LEN,
1863 GFP_KERNEL);
1864 if (!nsblk->uuid)
1865 goto err;
1866 memcpy(name, nd_label->name, NSLABEL_NAME_LEN);
1867 if (name[0])
1868 nsblk->alt_name = kmemdup(name, NSLABEL_NAME_LEN,
1869 GFP_KERNEL);
1870 res = nsblk_add_resource(nd_region, ndd, nsblk,
1871 __le64_to_cpu(nd_label->dpa));
1872 if (!res)
1873 goto err;
1874 nd_dbg_dpa(nd_region, ndd, res, "%s assign\n",
8c2f7e86 1875 dev_name(&nsblk->common.dev));
1b40e09a
DW		 1876 }
1877
1878 dev_dbg(&nd_region->dev, "%s: discovered %d blk namespace%s\n",
1879 __func__, count, count == 1 ? "" : "s");
1880
1881 if (count == 0) {
1882 /* Publish a zero-sized namespace for userspace to configure. */
1883 for (i = 0; i < nd_region->ndr_mappings; i++) {
1884 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1885
1886 kfree(nd_mapping->labels);
1887 nd_mapping->labels = NULL;
1888 }
1889
1890 devs = kcalloc(2, sizeof(dev), GFP_KERNEL);
1891 if (!devs)
1892 goto err;
1893 nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
1894 if (!nsblk)
1895 goto err;
8c2f7e86 1896 dev = &nsblk->common.dev;
1b40e09a
DW		 1897 dev->type = &namespace_blk_device_type;
1898 dev->parent = &nd_region->dev;
1899 devs[count++] = dev;
1900 }
1901
1902 return devs;
1903
1904err:
1905 for (i = 0; i < count; i++) {
1906 nsblk = to_nd_namespace_blk(devs[i]);
8c2f7e86 1907 namespace_blk_release(&nsblk->common.dev);
1b40e09a
DW		 1908 }
1909 kfree(devs);
1910 return NULL;
1911}
1912
bf9bccc1
DW		 1913static int init_active_labels(struct nd_region *nd_region)
1914{
1915 int i;
1916
1917 for (i = 0; i < nd_region->ndr_mappings; i++) {
1918 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1919 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1920 struct nvdimm *nvdimm = nd_mapping->nvdimm;
1921 int count, j;
1922
1923 /*
1924 * If the dimm is disabled then prevent the region from
1925 * being activated if it aliases DPA.
1926 */
1927 if (!ndd) {
1928 if ((nvdimm->flags & NDD_ALIASING) == 0)
1929 return 0;
1930 dev_dbg(&nd_region->dev, "%s: is disabled, failing probe\n",
1931 dev_name(&nd_mapping->nvdimm->dev));
1932 return -ENXIO;
1933 }
1934 nd_mapping->ndd = ndd;
1935 atomic_inc(&nvdimm->busy);
1936 get_ndd(ndd);
1937
1938 count = nd_label_active_count(ndd);
1939 dev_dbg(ndd->dev, "%s: %d\n", __func__, count);
1940 if (!count)
1941 continue;
1942 nd_mapping->labels = kcalloc(count + 1, sizeof(void *),
1943 GFP_KERNEL);
1944 if (!nd_mapping->labels)
1945 return -ENOMEM;
1946 for (j = 0; j < count; j++) {
1947 struct nd_namespace_label *label;
1948
1949 label = nd_label_active(ndd, j);
1950 nd_mapping->labels[j] = label;
1951 }
1952 }
1953
1954 return 0;
1955}
1956
3d88002e
DW		 1957int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
1958{
1959 struct device **devs = NULL;
bf9bccc1 1960 int i, rc = 0, type;
3d88002e
DW		 1961
1962 *err = 0;
bf9bccc1
DW		 1963 nvdimm_bus_lock(&nd_region->dev);
1964 rc = init_active_labels(nd_region);
1965 if (rc) {
1966 nvdimm_bus_unlock(&nd_region->dev);
1967 return rc;
1968 }
1969
1970 type = nd_region_to_nstype(nd_region);
1971 switch (type) {
3d88002e
DW		 1972 case ND_DEVICE_NAMESPACE_IO:
1973 devs = create_namespace_io(nd_region);
1974 break;
bf9bccc1
DW		 1975 case ND_DEVICE_NAMESPACE_PMEM:
1976 devs = create_namespace_pmem(nd_region);
1977 break;
1b40e09a
DW		 1978 case ND_DEVICE_NAMESPACE_BLK:
1979 devs = create_namespace_blk(nd_region);
1980 break;
3d88002e
DW		 1981 default:
1982 break;
1983 }
bf9bccc1 1984 nvdimm_bus_unlock(&nd_region->dev);
3d88002e
DW		 1985
1986 if (!devs)
1987 return -ENODEV;
1988
1989 for (i = 0; devs[i]; i++) {
1990 struct device *dev = devs[i];
1b40e09a 1991 int id;
3d88002e 1992
1b40e09a
DW		 1993 if (type == ND_DEVICE_NAMESPACE_BLK) {
1994 struct nd_namespace_blk *nsblk;
1995
1996 nsblk = to_nd_namespace_blk(dev);
1997 id = ida_simple_get(&nd_region->ns_ida, 0, 0,
1998 GFP_KERNEL);
1999 nsblk->id = id;
2000 } else
2001 id = i;
2002
2003 if (id < 0)
2004 break;
2005 dev_set_name(dev, "namespace%d.%d", nd_region->id, id);
3d88002e
DW		 2006 dev->groups = nd_namespace_attribute_groups;
2007 nd_device_register(dev);
2008 }
1b40e09a
DW		 2009 if (i)
2010 nd_region->ns_seed = devs[0];
2011
2012 if (devs[i]) {
2013 int j;
2014
2015 for (j = i; devs[j]; j++) {
2016 struct device *dev = devs[j];
2017
2018 device_initialize(dev);
2019 put_device(dev);
2020 }
2021 *err = j - i;
2022 /*
2023 * All of the namespaces we tried to register failed, so
2024 * fail region activation.
2025 */
2026 if (*err == 0)
2027 rc = -ENODEV;
2028 }
3d88002e
DW		 2029 kfree(devs);
2030
1b40e09a
DW		 2031 if (rc == -ENODEV)
2032 return rc;
2033
3d88002e
DW		 2034 return i;
2035}
Linux kernel - Deliverables
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