blob: a5233422f9dc5f770b98d0555560fb87a5f83ff0 [file] [log] [blame]
Dan Williams1f7df6f2015-06-09 20:13:14 -04001/*
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 */
Dan Williamseaf96152015-05-01 13:11:27 -040013#include <linux/scatterlist.h>
Ross Zwisler047fc8a2015-06-25 04:21:02 -040014#include <linux/highmem.h>
Dan Williamseaf96152015-05-01 13:11:27 -040015#include <linux/sched.h>
Dan Williams1f7df6f2015-06-09 20:13:14 -040016#include <linux/slab.h>
Dan Williamseaf96152015-05-01 13:11:27 -040017#include <linux/sort.h>
Dan Williams1f7df6f2015-06-09 20:13:14 -040018#include <linux/io.h>
Dan Williamsbf9bccc2015-06-17 17:14:46 -040019#include <linux/nd.h>
Dan Williams1f7df6f2015-06-09 20:13:14 -040020#include "nd-core.h"
21#include "nd.h"
22
23static DEFINE_IDA(region_ida);
24
25static void nd_region_release(struct device *dev)
26{
27 struct nd_region *nd_region = to_nd_region(dev);
28 u16 i;
29
30 for (i = 0; i < nd_region->ndr_mappings; i++) {
31 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
32 struct nvdimm *nvdimm = nd_mapping->nvdimm;
33
34 put_device(&nvdimm->dev);
35 }
Vishal Verma5212e112015-06-25 04:20:32 -040036 free_percpu(nd_region->lane);
Dan Williams1f7df6f2015-06-09 20:13:14 -040037 ida_simple_remove(&region_ida, nd_region->id);
Ross Zwisler047fc8a2015-06-25 04:21:02 -040038 if (is_nd_blk(dev))
39 kfree(to_nd_blk_region(dev));
40 else
41 kfree(nd_region);
Dan Williams1f7df6f2015-06-09 20:13:14 -040042}
43
44static struct device_type nd_blk_device_type = {
45 .name = "nd_blk",
46 .release = nd_region_release,
47};
48
49static struct device_type nd_pmem_device_type = {
50 .name = "nd_pmem",
51 .release = nd_region_release,
52};
53
54static struct device_type nd_volatile_device_type = {
55 .name = "nd_volatile",
56 .release = nd_region_release,
57};
58
Dan Williams3d880022015-05-31 15:02:11 -040059bool is_nd_pmem(struct device *dev)
Dan Williams1f7df6f2015-06-09 20:13:14 -040060{
61 return dev ? dev->type == &nd_pmem_device_type : false;
62}
63
Dan Williams3d880022015-05-31 15:02:11 -040064bool is_nd_blk(struct device *dev)
65{
66 return dev ? dev->type == &nd_blk_device_type : false;
67}
68
Dan Williams1f7df6f2015-06-09 20:13:14 -040069struct nd_region *to_nd_region(struct device *dev)
70{
71 struct nd_region *nd_region = container_of(dev, struct nd_region, dev);
72
73 WARN_ON(dev->type->release != nd_region_release);
74 return nd_region;
75}
76EXPORT_SYMBOL_GPL(to_nd_region);
77
Ross Zwisler047fc8a2015-06-25 04:21:02 -040078struct nd_blk_region *to_nd_blk_region(struct device *dev)
79{
80 struct nd_region *nd_region = to_nd_region(dev);
81
82 WARN_ON(!is_nd_blk(dev));
83 return container_of(nd_region, struct nd_blk_region, nd_region);
84}
85EXPORT_SYMBOL_GPL(to_nd_blk_region);
86
87void *nd_region_provider_data(struct nd_region *nd_region)
88{
89 return nd_region->provider_data;
90}
91EXPORT_SYMBOL_GPL(nd_region_provider_data);
92
93void *nd_blk_region_provider_data(struct nd_blk_region *ndbr)
94{
95 return ndbr->blk_provider_data;
96}
97EXPORT_SYMBOL_GPL(nd_blk_region_provider_data);
98
99void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data)
100{
101 ndbr->blk_provider_data = data;
102}
103EXPORT_SYMBOL_GPL(nd_blk_region_set_provider_data);
104
Dan Williams3d880022015-05-31 15:02:11 -0400105/**
106 * nd_region_to_nstype() - region to an integer namespace type
107 * @nd_region: region-device to interrogate
108 *
109 * This is the 'nstype' attribute of a region as well, an input to the
110 * MODALIAS for namespace devices, and bit number for a nvdimm_bus to match
111 * namespace devices with namespace drivers.
112 */
113int nd_region_to_nstype(struct nd_region *nd_region)
114{
115 if (is_nd_pmem(&nd_region->dev)) {
116 u16 i, alias;
117
118 for (i = 0, alias = 0; i < nd_region->ndr_mappings; i++) {
119 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
120 struct nvdimm *nvdimm = nd_mapping->nvdimm;
121
122 if (nvdimm->flags & NDD_ALIASING)
123 alias++;
124 }
125 if (alias)
126 return ND_DEVICE_NAMESPACE_PMEM;
127 else
128 return ND_DEVICE_NAMESPACE_IO;
129 } else if (is_nd_blk(&nd_region->dev)) {
130 return ND_DEVICE_NAMESPACE_BLK;
131 }
132
133 return 0;
134}
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400135EXPORT_SYMBOL(nd_region_to_nstype);
136
137static int is_uuid_busy(struct device *dev, void *data)
138{
139 struct nd_region *nd_region = to_nd_region(dev->parent);
140 u8 *uuid = data;
141
142 switch (nd_region_to_nstype(nd_region)) {
143 case ND_DEVICE_NAMESPACE_PMEM: {
144 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
145
146 if (!nspm->uuid)
147 break;
148 if (memcmp(uuid, nspm->uuid, NSLABEL_UUID_LEN) == 0)
149 return -EBUSY;
150 break;
151 }
152 case ND_DEVICE_NAMESPACE_BLK: {
Dan Williams1b40e092015-05-01 13:34:01 -0400153 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
154
155 if (!nsblk->uuid)
156 break;
157 if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) == 0)
158 return -EBUSY;
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400159 break;
160 }
161 default:
162 break;
163 }
164
165 return 0;
166}
167
168static int is_namespace_uuid_busy(struct device *dev, void *data)
169{
170 if (is_nd_pmem(dev) || is_nd_blk(dev))
171 return device_for_each_child(dev, data, is_uuid_busy);
172 return 0;
173}
174
175/**
176 * nd_is_uuid_unique - verify that no other namespace has @uuid
177 * @dev: any device on a nvdimm_bus
178 * @uuid: uuid to check
179 */
180bool nd_is_uuid_unique(struct device *dev, u8 *uuid)
181{
182 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
183
184 if (!nvdimm_bus)
185 return false;
186 WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm_bus->dev));
187 if (device_for_each_child(&nvdimm_bus->dev, uuid,
188 is_namespace_uuid_busy) != 0)
189 return false;
190 return true;
191}
Dan Williams3d880022015-05-31 15:02:11 -0400192
Dan Williams1f7df6f2015-06-09 20:13:14 -0400193static ssize_t size_show(struct device *dev,
194 struct device_attribute *attr, char *buf)
195{
196 struct nd_region *nd_region = to_nd_region(dev);
197 unsigned long long size = 0;
198
199 if (is_nd_pmem(dev)) {
200 size = nd_region->ndr_size;
201 } else if (nd_region->ndr_mappings == 1) {
202 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
203
204 size = nd_mapping->size;
205 }
206
207 return sprintf(buf, "%llu\n", size);
208}
209static DEVICE_ATTR_RO(size);
210
211static ssize_t mappings_show(struct device *dev,
212 struct device_attribute *attr, char *buf)
213{
214 struct nd_region *nd_region = to_nd_region(dev);
215
216 return sprintf(buf, "%d\n", nd_region->ndr_mappings);
217}
218static DEVICE_ATTR_RO(mappings);
219
Dan Williams3d880022015-05-31 15:02:11 -0400220static ssize_t nstype_show(struct device *dev,
221 struct device_attribute *attr, char *buf)
222{
223 struct nd_region *nd_region = to_nd_region(dev);
224
225 return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region));
226}
227static DEVICE_ATTR_RO(nstype);
228
Dan Williamseaf96152015-05-01 13:11:27 -0400229static ssize_t set_cookie_show(struct device *dev,
230 struct device_attribute *attr, char *buf)
231{
232 struct nd_region *nd_region = to_nd_region(dev);
233 struct nd_interleave_set *nd_set = nd_region->nd_set;
234
235 if (is_nd_pmem(dev) && nd_set)
236 /* pass, should be precluded by region_visible */;
237 else
238 return -ENXIO;
239
240 return sprintf(buf, "%#llx\n", nd_set->cookie);
241}
242static DEVICE_ATTR_RO(set_cookie);
243
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400244resource_size_t nd_region_available_dpa(struct nd_region *nd_region)
245{
246 resource_size_t blk_max_overlap = 0, available, overlap;
247 int i;
248
249 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
250
251 retry:
252 available = 0;
253 overlap = blk_max_overlap;
254 for (i = 0; i < nd_region->ndr_mappings; i++) {
255 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
256 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
257
258 /* if a dimm is disabled the available capacity is zero */
259 if (!ndd)
260 return 0;
261
262 if (is_nd_pmem(&nd_region->dev)) {
263 available += nd_pmem_available_dpa(nd_region,
264 nd_mapping, &overlap);
265 if (overlap > blk_max_overlap) {
266 blk_max_overlap = overlap;
267 goto retry;
268 }
269 } else if (is_nd_blk(&nd_region->dev)) {
Dan Williams1b40e092015-05-01 13:34:01 -0400270 available += nd_blk_available_dpa(nd_mapping);
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400271 }
272 }
273
274 return available;
275}
276
277static ssize_t available_size_show(struct device *dev,
278 struct device_attribute *attr, char *buf)
279{
280 struct nd_region *nd_region = to_nd_region(dev);
281 unsigned long long available = 0;
282
283 /*
284 * Flush in-flight updates and grab a snapshot of the available
285 * size. Of course, this value is potentially invalidated the
286 * memory nvdimm_bus_lock() is dropped, but that's userspace's
287 * problem to not race itself.
288 */
289 nvdimm_bus_lock(dev);
290 wait_nvdimm_bus_probe_idle(dev);
291 available = nd_region_available_dpa(nd_region);
292 nvdimm_bus_unlock(dev);
293
294 return sprintf(buf, "%llu\n", available);
295}
296static DEVICE_ATTR_RO(available_size);
297
Dan Williams3d880022015-05-31 15:02:11 -0400298static ssize_t init_namespaces_show(struct device *dev,
299 struct device_attribute *attr, char *buf)
300{
301 struct nd_region_namespaces *num_ns = dev_get_drvdata(dev);
302 ssize_t rc;
303
304 nvdimm_bus_lock(dev);
305 if (num_ns)
306 rc = sprintf(buf, "%d/%d\n", num_ns->active, num_ns->count);
307 else
308 rc = -ENXIO;
309 nvdimm_bus_unlock(dev);
310
311 return rc;
312}
313static DEVICE_ATTR_RO(init_namespaces);
314
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400315static ssize_t namespace_seed_show(struct device *dev,
316 struct device_attribute *attr, char *buf)
317{
318 struct nd_region *nd_region = to_nd_region(dev);
319 ssize_t rc;
320
321 nvdimm_bus_lock(dev);
322 if (nd_region->ns_seed)
323 rc = sprintf(buf, "%s\n", dev_name(nd_region->ns_seed));
324 else
325 rc = sprintf(buf, "\n");
326 nvdimm_bus_unlock(dev);
327 return rc;
328}
329static DEVICE_ATTR_RO(namespace_seed);
330
Dan Williams8c2f7e82015-06-25 04:20:04 -0400331static ssize_t btt_seed_show(struct device *dev,
332 struct device_attribute *attr, char *buf)
333{
334 struct nd_region *nd_region = to_nd_region(dev);
335 ssize_t rc;
336
337 nvdimm_bus_lock(dev);
338 if (nd_region->btt_seed)
339 rc = sprintf(buf, "%s\n", dev_name(nd_region->btt_seed));
340 else
341 rc = sprintf(buf, "\n");
342 nvdimm_bus_unlock(dev);
343
344 return rc;
345}
346static DEVICE_ATTR_RO(btt_seed);
347
Dan Williams58138822015-06-23 20:08:34 -0400348static ssize_t read_only_show(struct device *dev,
349 struct device_attribute *attr, char *buf)
350{
351 struct nd_region *nd_region = to_nd_region(dev);
352
353 return sprintf(buf, "%d\n", nd_region->ro);
354}
355
356static ssize_t read_only_store(struct device *dev,
357 struct device_attribute *attr, const char *buf, size_t len)
358{
359 bool ro;
360 int rc = strtobool(buf, &ro);
361 struct nd_region *nd_region = to_nd_region(dev);
362
363 if (rc)
364 return rc;
365
366 nd_region->ro = ro;
367 return len;
368}
369static DEVICE_ATTR_RW(read_only);
370
Dan Williams1f7df6f2015-06-09 20:13:14 -0400371static struct attribute *nd_region_attributes[] = {
372 &dev_attr_size.attr,
Dan Williams3d880022015-05-31 15:02:11 -0400373 &dev_attr_nstype.attr,
Dan Williams1f7df6f2015-06-09 20:13:14 -0400374 &dev_attr_mappings.attr,
Dan Williams8c2f7e82015-06-25 04:20:04 -0400375 &dev_attr_btt_seed.attr,
Dan Williams58138822015-06-23 20:08:34 -0400376 &dev_attr_read_only.attr,
Dan Williamseaf96152015-05-01 13:11:27 -0400377 &dev_attr_set_cookie.attr,
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400378 &dev_attr_available_size.attr,
379 &dev_attr_namespace_seed.attr,
Dan Williams3d880022015-05-31 15:02:11 -0400380 &dev_attr_init_namespaces.attr,
Dan Williams1f7df6f2015-06-09 20:13:14 -0400381 NULL,
382};
383
Dan Williamseaf96152015-05-01 13:11:27 -0400384static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n)
385{
386 struct device *dev = container_of(kobj, typeof(*dev), kobj);
387 struct nd_region *nd_region = to_nd_region(dev);
388 struct nd_interleave_set *nd_set = nd_region->nd_set;
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400389 int type = nd_region_to_nstype(nd_region);
Dan Williamseaf96152015-05-01 13:11:27 -0400390
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400391 if (a != &dev_attr_set_cookie.attr
392 && a != &dev_attr_available_size.attr)
Dan Williamseaf96152015-05-01 13:11:27 -0400393 return a->mode;
394
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400395 if ((type == ND_DEVICE_NAMESPACE_PMEM
396 || type == ND_DEVICE_NAMESPACE_BLK)
397 && a == &dev_attr_available_size.attr)
398 return a->mode;
399 else if (is_nd_pmem(dev) && nd_set)
400 return a->mode;
Dan Williamseaf96152015-05-01 13:11:27 -0400401
402 return 0;
403}
404
Dan Williams1f7df6f2015-06-09 20:13:14 -0400405struct attribute_group nd_region_attribute_group = {
406 .attrs = nd_region_attributes,
Dan Williamseaf96152015-05-01 13:11:27 -0400407 .is_visible = region_visible,
Dan Williams1f7df6f2015-06-09 20:13:14 -0400408};
409EXPORT_SYMBOL_GPL(nd_region_attribute_group);
410
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400411u64 nd_region_interleave_set_cookie(struct nd_region *nd_region)
412{
413 struct nd_interleave_set *nd_set = nd_region->nd_set;
414
415 if (nd_set)
416 return nd_set->cookie;
417 return 0;
418}
419
Dan Williamseaf96152015-05-01 13:11:27 -0400420/*
421 * Upon successful probe/remove, take/release a reference on the
Dan Williams8c2f7e82015-06-25 04:20:04 -0400422 * associated interleave set (if present), and plant new btt + namespace
Ross Zwisler047fc8a2015-06-25 04:21:02 -0400423 * seeds. Also, on the removal of a BLK region, notify the provider to
424 * disable the region.
Dan Williamseaf96152015-05-01 13:11:27 -0400425 */
426static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
427 struct device *dev, bool probe)
428{
Dan Williams8c2f7e82015-06-25 04:20:04 -0400429 struct nd_region *nd_region;
430
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400431 if (!probe && (is_nd_pmem(dev) || is_nd_blk(dev))) {
Dan Williamseaf96152015-05-01 13:11:27 -0400432 int i;
433
Dan Williams8c2f7e82015-06-25 04:20:04 -0400434 nd_region = to_nd_region(dev);
Dan Williamseaf96152015-05-01 13:11:27 -0400435 for (i = 0; i < nd_region->ndr_mappings; i++) {
436 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400437 struct nvdimm_drvdata *ndd = nd_mapping->ndd;
Dan Williamseaf96152015-05-01 13:11:27 -0400438 struct nvdimm *nvdimm = nd_mapping->nvdimm;
439
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400440 kfree(nd_mapping->labels);
441 nd_mapping->labels = NULL;
442 put_ndd(ndd);
443 nd_mapping->ndd = NULL;
Ross Zwisler047fc8a2015-06-25 04:21:02 -0400444 if (ndd)
445 atomic_dec(&nvdimm->busy);
Dan Williamseaf96152015-05-01 13:11:27 -0400446 }
Ross Zwisler047fc8a2015-06-25 04:21:02 -0400447
448 if (is_nd_pmem(dev))
449 return;
450
451 to_nd_blk_region(dev)->disable(nvdimm_bus, dev);
Dan Williams8c2f7e82015-06-25 04:20:04 -0400452 }
453 if (dev->parent && is_nd_blk(dev->parent) && probe) {
454 nd_region = to_nd_region(dev->parent);
Dan Williams1b40e092015-05-01 13:34:01 -0400455 nvdimm_bus_lock(dev);
456 if (nd_region->ns_seed == dev)
457 nd_region_create_blk_seed(nd_region);
458 nvdimm_bus_unlock(dev);
Dan Williamseaf96152015-05-01 13:11:27 -0400459 }
Dan Williams8c2f7e82015-06-25 04:20:04 -0400460 if (is_nd_btt(dev) && probe) {
461 nd_region = to_nd_region(dev->parent);
462 nvdimm_bus_lock(dev);
463 if (nd_region->btt_seed == dev)
464 nd_region_create_btt_seed(nd_region);
465 nvdimm_bus_unlock(dev);
466 }
Dan Williamseaf96152015-05-01 13:11:27 -0400467}
468
469void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev)
470{
471 nd_region_notify_driver_action(nvdimm_bus, dev, true);
472}
473
474void nd_region_disable(struct nvdimm_bus *nvdimm_bus, struct device *dev)
475{
476 nd_region_notify_driver_action(nvdimm_bus, dev, false);
477}
478
Dan Williams1f7df6f2015-06-09 20:13:14 -0400479static ssize_t mappingN(struct device *dev, char *buf, int n)
480{
481 struct nd_region *nd_region = to_nd_region(dev);
482 struct nd_mapping *nd_mapping;
483 struct nvdimm *nvdimm;
484
485 if (n >= nd_region->ndr_mappings)
486 return -ENXIO;
487 nd_mapping = &nd_region->mapping[n];
488 nvdimm = nd_mapping->nvdimm;
489
490 return sprintf(buf, "%s,%llu,%llu\n", dev_name(&nvdimm->dev),
491 nd_mapping->start, nd_mapping->size);
492}
493
494#define REGION_MAPPING(idx) \
495static ssize_t mapping##idx##_show(struct device *dev, \
496 struct device_attribute *attr, char *buf) \
497{ \
498 return mappingN(dev, buf, idx); \
499} \
500static DEVICE_ATTR_RO(mapping##idx)
501
502/*
503 * 32 should be enough for a while, even in the presence of socket
504 * interleave a 32-way interleave set is a degenerate case.
505 */
506REGION_MAPPING(0);
507REGION_MAPPING(1);
508REGION_MAPPING(2);
509REGION_MAPPING(3);
510REGION_MAPPING(4);
511REGION_MAPPING(5);
512REGION_MAPPING(6);
513REGION_MAPPING(7);
514REGION_MAPPING(8);
515REGION_MAPPING(9);
516REGION_MAPPING(10);
517REGION_MAPPING(11);
518REGION_MAPPING(12);
519REGION_MAPPING(13);
520REGION_MAPPING(14);
521REGION_MAPPING(15);
522REGION_MAPPING(16);
523REGION_MAPPING(17);
524REGION_MAPPING(18);
525REGION_MAPPING(19);
526REGION_MAPPING(20);
527REGION_MAPPING(21);
528REGION_MAPPING(22);
529REGION_MAPPING(23);
530REGION_MAPPING(24);
531REGION_MAPPING(25);
532REGION_MAPPING(26);
533REGION_MAPPING(27);
534REGION_MAPPING(28);
535REGION_MAPPING(29);
536REGION_MAPPING(30);
537REGION_MAPPING(31);
538
539static umode_t mapping_visible(struct kobject *kobj, struct attribute *a, int n)
540{
541 struct device *dev = container_of(kobj, struct device, kobj);
542 struct nd_region *nd_region = to_nd_region(dev);
543
544 if (n < nd_region->ndr_mappings)
545 return a->mode;
546 return 0;
547}
548
549static struct attribute *mapping_attributes[] = {
550 &dev_attr_mapping0.attr,
551 &dev_attr_mapping1.attr,
552 &dev_attr_mapping2.attr,
553 &dev_attr_mapping3.attr,
554 &dev_attr_mapping4.attr,
555 &dev_attr_mapping5.attr,
556 &dev_attr_mapping6.attr,
557 &dev_attr_mapping7.attr,
558 &dev_attr_mapping8.attr,
559 &dev_attr_mapping9.attr,
560 &dev_attr_mapping10.attr,
561 &dev_attr_mapping11.attr,
562 &dev_attr_mapping12.attr,
563 &dev_attr_mapping13.attr,
564 &dev_attr_mapping14.attr,
565 &dev_attr_mapping15.attr,
566 &dev_attr_mapping16.attr,
567 &dev_attr_mapping17.attr,
568 &dev_attr_mapping18.attr,
569 &dev_attr_mapping19.attr,
570 &dev_attr_mapping20.attr,
571 &dev_attr_mapping21.attr,
572 &dev_attr_mapping22.attr,
573 &dev_attr_mapping23.attr,
574 &dev_attr_mapping24.attr,
575 &dev_attr_mapping25.attr,
576 &dev_attr_mapping26.attr,
577 &dev_attr_mapping27.attr,
578 &dev_attr_mapping28.attr,
579 &dev_attr_mapping29.attr,
580 &dev_attr_mapping30.attr,
581 &dev_attr_mapping31.attr,
582 NULL,
583};
584
585struct attribute_group nd_mapping_attribute_group = {
586 .is_visible = mapping_visible,
587 .attrs = mapping_attributes,
588};
589EXPORT_SYMBOL_GPL(nd_mapping_attribute_group);
590
Ross Zwisler047fc8a2015-06-25 04:21:02 -0400591int nd_blk_region_init(struct nd_region *nd_region)
Dan Williams1f7df6f2015-06-09 20:13:14 -0400592{
Ross Zwisler047fc8a2015-06-25 04:21:02 -0400593 struct device *dev = &nd_region->dev;
594 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
595
596 if (!is_nd_blk(dev))
597 return 0;
598
599 if (nd_region->ndr_mappings < 1) {
600 dev_err(dev, "invalid BLK region\n");
601 return -ENXIO;
602 }
603
604 return to_nd_blk_region(dev)->enable(nvdimm_bus, dev);
Dan Williams1f7df6f2015-06-09 20:13:14 -0400605}
Dan Williams1f7df6f2015-06-09 20:13:14 -0400606
Vishal Verma5212e112015-06-25 04:20:32 -0400607/**
608 * nd_region_acquire_lane - allocate and lock a lane
609 * @nd_region: region id and number of lanes possible
610 *
611 * A lane correlates to a BLK-data-window and/or a log slot in the BTT.
612 * We optimize for the common case where there are 256 lanes, one
613 * per-cpu. For larger systems we need to lock to share lanes. For now
614 * this implementation assumes the cost of maintaining an allocator for
615 * free lanes is on the order of the lock hold time, so it implements a
616 * static lane = cpu % num_lanes mapping.
617 *
618 * In the case of a BTT instance on top of a BLK namespace a lane may be
619 * acquired recursively. We lock on the first instance.
620 *
621 * In the case of a BTT instance on top of PMEM, we only acquire a lane
622 * for the BTT metadata updates.
623 */
624unsigned int nd_region_acquire_lane(struct nd_region *nd_region)
625{
626 unsigned int cpu, lane;
627
628 cpu = get_cpu();
629 if (nd_region->num_lanes < nr_cpu_ids) {
630 struct nd_percpu_lane *ndl_lock, *ndl_count;
631
632 lane = cpu % nd_region->num_lanes;
633 ndl_count = per_cpu_ptr(nd_region->lane, cpu);
634 ndl_lock = per_cpu_ptr(nd_region->lane, lane);
635 if (ndl_count->count++ == 0)
636 spin_lock(&ndl_lock->lock);
637 } else
638 lane = cpu;
639
640 return lane;
641}
642EXPORT_SYMBOL(nd_region_acquire_lane);
643
644void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane)
645{
646 if (nd_region->num_lanes < nr_cpu_ids) {
647 unsigned int cpu = get_cpu();
648 struct nd_percpu_lane *ndl_lock, *ndl_count;
649
650 ndl_count = per_cpu_ptr(nd_region->lane, cpu);
651 ndl_lock = per_cpu_ptr(nd_region->lane, lane);
652 if (--ndl_count->count == 0)
653 spin_unlock(&ndl_lock->lock);
654 put_cpu();
655 }
656 put_cpu();
657}
658EXPORT_SYMBOL(nd_region_release_lane);
659
Dan Williams1f7df6f2015-06-09 20:13:14 -0400660static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
661 struct nd_region_desc *ndr_desc, struct device_type *dev_type,
662 const char *caller)
663{
664 struct nd_region *nd_region;
665 struct device *dev;
Ross Zwisler047fc8a2015-06-25 04:21:02 -0400666 void *region_buf;
Vishal Verma5212e112015-06-25 04:20:32 -0400667 unsigned int i;
Dan Williams58138822015-06-23 20:08:34 -0400668 int ro = 0;
Dan Williams1f7df6f2015-06-09 20:13:14 -0400669
670 for (i = 0; i < ndr_desc->num_mappings; i++) {
671 struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
672 struct nvdimm *nvdimm = nd_mapping->nvdimm;
673
674 if ((nd_mapping->start | nd_mapping->size) % SZ_4K) {
675 dev_err(&nvdimm_bus->dev, "%s: %s mapping%d is not 4K aligned\n",
676 caller, dev_name(&nvdimm->dev), i);
677
678 return NULL;
679 }
Dan Williams58138822015-06-23 20:08:34 -0400680
681 if (nvdimm->flags & NDD_UNARMED)
682 ro = 1;
Dan Williams1f7df6f2015-06-09 20:13:14 -0400683 }
684
Ross Zwisler047fc8a2015-06-25 04:21:02 -0400685 if (dev_type == &nd_blk_device_type) {
686 struct nd_blk_region_desc *ndbr_desc;
687 struct nd_blk_region *ndbr;
688
689 ndbr_desc = to_blk_region_desc(ndr_desc);
690 ndbr = kzalloc(sizeof(*ndbr) + sizeof(struct nd_mapping)
691 * ndr_desc->num_mappings,
692 GFP_KERNEL);
693 if (ndbr) {
694 nd_region = &ndbr->nd_region;
695 ndbr->enable = ndbr_desc->enable;
696 ndbr->disable = ndbr_desc->disable;
697 ndbr->do_io = ndbr_desc->do_io;
698 }
699 region_buf = ndbr;
700 } else {
701 nd_region = kzalloc(sizeof(struct nd_region)
702 + sizeof(struct nd_mapping)
703 * ndr_desc->num_mappings,
704 GFP_KERNEL);
705 region_buf = nd_region;
706 }
707
708 if (!region_buf)
Dan Williams1f7df6f2015-06-09 20:13:14 -0400709 return NULL;
710 nd_region->id = ida_simple_get(&region_ida, 0, 0, GFP_KERNEL);
Vishal Verma5212e112015-06-25 04:20:32 -0400711 if (nd_region->id < 0)
712 goto err_id;
713
714 nd_region->lane = alloc_percpu(struct nd_percpu_lane);
715 if (!nd_region->lane)
716 goto err_percpu;
717
718 for (i = 0; i < nr_cpu_ids; i++) {
719 struct nd_percpu_lane *ndl;
720
721 ndl = per_cpu_ptr(nd_region->lane, i);
722 spin_lock_init(&ndl->lock);
723 ndl->count = 0;
Dan Williams1f7df6f2015-06-09 20:13:14 -0400724 }
725
726 memcpy(nd_region->mapping, ndr_desc->nd_mapping,
727 sizeof(struct nd_mapping) * ndr_desc->num_mappings);
728 for (i = 0; i < ndr_desc->num_mappings; i++) {
729 struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
730 struct nvdimm *nvdimm = nd_mapping->nvdimm;
731
732 get_device(&nvdimm->dev);
733 }
734 nd_region->ndr_mappings = ndr_desc->num_mappings;
735 nd_region->provider_data = ndr_desc->provider_data;
Dan Williamseaf96152015-05-01 13:11:27 -0400736 nd_region->nd_set = ndr_desc->nd_set;
Vishal Verma5212e112015-06-25 04:20:32 -0400737 nd_region->num_lanes = ndr_desc->num_lanes;
Dan Williams58138822015-06-23 20:08:34 -0400738 nd_region->ro = ro;
Toshi Kani41d7a6d2015-06-19 12:18:33 -0600739 nd_region->numa_node = ndr_desc->numa_node;
Dan Williams1b40e092015-05-01 13:34:01 -0400740 ida_init(&nd_region->ns_ida);
Dan Williams8c2f7e82015-06-25 04:20:04 -0400741 ida_init(&nd_region->btt_ida);
Dan Williams1f7df6f2015-06-09 20:13:14 -0400742 dev = &nd_region->dev;
743 dev_set_name(dev, "region%d", nd_region->id);
744 dev->parent = &nvdimm_bus->dev;
745 dev->type = dev_type;
746 dev->groups = ndr_desc->attr_groups;
747 nd_region->ndr_size = resource_size(ndr_desc->res);
748 nd_region->ndr_start = ndr_desc->res->start;
749 nd_device_register(dev);
750
751 return nd_region;
Vishal Verma5212e112015-06-25 04:20:32 -0400752
753 err_percpu:
754 ida_simple_remove(&region_ida, nd_region->id);
755 err_id:
Ross Zwisler047fc8a2015-06-25 04:21:02 -0400756 kfree(region_buf);
Vishal Verma5212e112015-06-25 04:20:32 -0400757 return NULL;
Dan Williams1f7df6f2015-06-09 20:13:14 -0400758}
759
760struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
761 struct nd_region_desc *ndr_desc)
762{
Vishal Verma5212e112015-06-25 04:20:32 -0400763 ndr_desc->num_lanes = ND_MAX_LANES;
Dan Williams1f7df6f2015-06-09 20:13:14 -0400764 return nd_region_create(nvdimm_bus, ndr_desc, &nd_pmem_device_type,
765 __func__);
766}
767EXPORT_SYMBOL_GPL(nvdimm_pmem_region_create);
768
769struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
770 struct nd_region_desc *ndr_desc)
771{
772 if (ndr_desc->num_mappings > 1)
773 return NULL;
Vishal Verma5212e112015-06-25 04:20:32 -0400774 ndr_desc->num_lanes = min(ndr_desc->num_lanes, ND_MAX_LANES);
Dan Williams1f7df6f2015-06-09 20:13:14 -0400775 return nd_region_create(nvdimm_bus, ndr_desc, &nd_blk_device_type,
776 __func__);
777}
778EXPORT_SYMBOL_GPL(nvdimm_blk_region_create);
779
780struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
781 struct nd_region_desc *ndr_desc)
782{
Vishal Verma5212e112015-06-25 04:20:32 -0400783 ndr_desc->num_lanes = ND_MAX_LANES;
Dan Williams1f7df6f2015-06-09 20:13:14 -0400784 return nd_region_create(nvdimm_bus, ndr_desc, &nd_volatile_device_type,
785 __func__);
786}
787EXPORT_SYMBOL_GPL(nvdimm_volatile_region_create);