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b94d5230 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/libnvdimm.h> | |
b95f5f43 | 14 | #include <linux/badblocks.h> |
b94d5230 DW |
15 | #include <linux/export.h> |
16 | #include <linux/module.h> | |
41cd8b70 | 17 | #include <linux/blkdev.h> |
b94d5230 | 18 | #include <linux/device.h> |
bf9bccc1 | 19 | #include <linux/ctype.h> |
62232e45 | 20 | #include <linux/ndctl.h> |
45def22c | 21 | #include <linux/mutex.h> |
b94d5230 | 22 | #include <linux/slab.h> |
29b9aa0a | 23 | #include <linux/io.h> |
b94d5230 | 24 | #include "nd-core.h" |
4d88a97a | 25 | #include "nd.h" |
b94d5230 | 26 | |
e6dfb2de DW |
27 | LIST_HEAD(nvdimm_bus_list); |
28 | DEFINE_MUTEX(nvdimm_bus_list_mutex); | |
b94d5230 | 29 | |
3d88002e DW |
30 | void nvdimm_bus_lock(struct device *dev) |
31 | { | |
32 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
33 | ||
34 | if (!nvdimm_bus) | |
35 | return; | |
36 | mutex_lock(&nvdimm_bus->reconfig_mutex); | |
37 | } | |
38 | EXPORT_SYMBOL(nvdimm_bus_lock); | |
39 | ||
40 | void nvdimm_bus_unlock(struct device *dev) | |
41 | { | |
42 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
43 | ||
44 | if (!nvdimm_bus) | |
45 | return; | |
46 | mutex_unlock(&nvdimm_bus->reconfig_mutex); | |
47 | } | |
48 | EXPORT_SYMBOL(nvdimm_bus_unlock); | |
49 | ||
50 | bool is_nvdimm_bus_locked(struct device *dev) | |
51 | { | |
52 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
53 | ||
54 | if (!nvdimm_bus) | |
55 | return false; | |
56 | return mutex_is_locked(&nvdimm_bus->reconfig_mutex); | |
57 | } | |
58 | EXPORT_SYMBOL(is_nvdimm_bus_locked); | |
59 | ||
29b9aa0a DW |
60 | struct nvdimm_map { |
61 | struct nvdimm_bus *nvdimm_bus; | |
62 | struct list_head list; | |
63 | resource_size_t offset; | |
64 | unsigned long flags; | |
65 | size_t size; | |
66 | union { | |
67 | void *mem; | |
68 | void __iomem *iomem; | |
69 | }; | |
70 | struct kref kref; | |
71 | }; | |
72 | ||
73 | static struct nvdimm_map *find_nvdimm_map(struct device *dev, | |
74 | resource_size_t offset) | |
75 | { | |
76 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
77 | struct nvdimm_map *nvdimm_map; | |
78 | ||
79 | list_for_each_entry(nvdimm_map, &nvdimm_bus->mapping_list, list) | |
80 | if (nvdimm_map->offset == offset) | |
81 | return nvdimm_map; | |
82 | return NULL; | |
83 | } | |
84 | ||
85 | static struct nvdimm_map *alloc_nvdimm_map(struct device *dev, | |
86 | resource_size_t offset, size_t size, unsigned long flags) | |
87 | { | |
88 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
89 | struct nvdimm_map *nvdimm_map; | |
90 | ||
91 | nvdimm_map = kzalloc(sizeof(*nvdimm_map), GFP_KERNEL); | |
92 | if (!nvdimm_map) | |
93 | return NULL; | |
94 | ||
95 | INIT_LIST_HEAD(&nvdimm_map->list); | |
96 | nvdimm_map->nvdimm_bus = nvdimm_bus; | |
97 | nvdimm_map->offset = offset; | |
98 | nvdimm_map->flags = flags; | |
99 | nvdimm_map->size = size; | |
100 | kref_init(&nvdimm_map->kref); | |
101 | ||
102 | if (!request_mem_region(offset, size, dev_name(&nvdimm_bus->dev))) | |
103 | goto err_request_region; | |
104 | ||
105 | if (flags) | |
106 | nvdimm_map->mem = memremap(offset, size, flags); | |
107 | else | |
108 | nvdimm_map->iomem = ioremap(offset, size); | |
109 | ||
110 | if (!nvdimm_map->mem) | |
111 | goto err_map; | |
112 | ||
113 | dev_WARN_ONCE(dev, !is_nvdimm_bus_locked(dev), "%s: bus unlocked!", | |
114 | __func__); | |
115 | list_add(&nvdimm_map->list, &nvdimm_bus->mapping_list); | |
116 | ||
117 | return nvdimm_map; | |
118 | ||
119 | err_map: | |
120 | release_mem_region(offset, size); | |
121 | err_request_region: | |
122 | kfree(nvdimm_map); | |
123 | return NULL; | |
124 | } | |
125 | ||
126 | static void nvdimm_map_release(struct kref *kref) | |
127 | { | |
128 | struct nvdimm_bus *nvdimm_bus; | |
129 | struct nvdimm_map *nvdimm_map; | |
130 | ||
131 | nvdimm_map = container_of(kref, struct nvdimm_map, kref); | |
132 | nvdimm_bus = nvdimm_map->nvdimm_bus; | |
133 | ||
134 | dev_dbg(&nvdimm_bus->dev, "%s: %pa\n", __func__, &nvdimm_map->offset); | |
135 | list_del(&nvdimm_map->list); | |
136 | if (nvdimm_map->flags) | |
137 | memunmap(nvdimm_map->mem); | |
138 | else | |
139 | iounmap(nvdimm_map->iomem); | |
140 | release_mem_region(nvdimm_map->offset, nvdimm_map->size); | |
141 | kfree(nvdimm_map); | |
142 | } | |
143 | ||
144 | static void nvdimm_map_put(void *data) | |
145 | { | |
146 | struct nvdimm_map *nvdimm_map = data; | |
147 | struct nvdimm_bus *nvdimm_bus = nvdimm_map->nvdimm_bus; | |
148 | ||
149 | nvdimm_bus_lock(&nvdimm_bus->dev); | |
150 | kref_put(&nvdimm_map->kref, nvdimm_map_release); | |
151 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
152 | } | |
153 | ||
154 | /** | |
155 | * devm_nvdimm_memremap - map a resource that is shared across regions | |
156 | * @dev: device that will own a reference to the shared mapping | |
157 | * @offset: physical base address of the mapping | |
158 | * @size: mapping size | |
159 | * @flags: memremap flags, or, if zero, perform an ioremap instead | |
160 | */ | |
161 | void *devm_nvdimm_memremap(struct device *dev, resource_size_t offset, | |
162 | size_t size, unsigned long flags) | |
163 | { | |
164 | struct nvdimm_map *nvdimm_map; | |
165 | ||
166 | nvdimm_bus_lock(dev); | |
167 | nvdimm_map = find_nvdimm_map(dev, offset); | |
168 | if (!nvdimm_map) | |
169 | nvdimm_map = alloc_nvdimm_map(dev, offset, size, flags); | |
170 | else | |
171 | kref_get(&nvdimm_map->kref); | |
172 | nvdimm_bus_unlock(dev); | |
173 | ||
174 | if (devm_add_action_or_reset(dev, nvdimm_map_put, nvdimm_map)) | |
175 | return NULL; | |
176 | ||
177 | return nvdimm_map->mem; | |
178 | } | |
179 | EXPORT_SYMBOL_GPL(devm_nvdimm_memremap); | |
180 | ||
eaf96153 DW |
181 | u64 nd_fletcher64(void *addr, size_t len, bool le) |
182 | { | |
183 | u32 *buf = addr; | |
184 | u32 lo32 = 0; | |
185 | u64 hi32 = 0; | |
186 | int i; | |
187 | ||
188 | for (i = 0; i < len / sizeof(u32); i++) { | |
189 | lo32 += le ? le32_to_cpu((__le32) buf[i]) : buf[i]; | |
190 | hi32 += lo32; | |
191 | } | |
192 | ||
193 | return hi32 << 32 | lo32; | |
194 | } | |
195 | EXPORT_SYMBOL_GPL(nd_fletcher64); | |
196 | ||
45def22c DW |
197 | struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus) |
198 | { | |
199 | /* struct nvdimm_bus definition is private to libnvdimm */ | |
200 | return nvdimm_bus->nd_desc; | |
201 | } | |
202 | EXPORT_SYMBOL_GPL(to_nd_desc); | |
203 | ||
bf9bccc1 DW |
204 | static bool is_uuid_sep(char sep) |
205 | { | |
206 | if (sep == '\n' || sep == '-' || sep == ':' || sep == '\0') | |
207 | return true; | |
208 | return false; | |
209 | } | |
210 | ||
211 | static int nd_uuid_parse(struct device *dev, u8 *uuid_out, const char *buf, | |
212 | size_t len) | |
213 | { | |
214 | const char *str = buf; | |
215 | u8 uuid[16]; | |
216 | int i; | |
217 | ||
218 | for (i = 0; i < 16; i++) { | |
219 | if (!isxdigit(str[0]) || !isxdigit(str[1])) { | |
220 | dev_dbg(dev, "%s: pos: %d buf[%zd]: %c buf[%zd]: %c\n", | |
221 | __func__, i, str - buf, str[0], | |
222 | str + 1 - buf, str[1]); | |
223 | return -EINVAL; | |
224 | } | |
225 | ||
226 | uuid[i] = (hex_to_bin(str[0]) << 4) | hex_to_bin(str[1]); | |
227 | str += 2; | |
228 | if (is_uuid_sep(*str)) | |
229 | str++; | |
230 | } | |
231 | ||
232 | memcpy(uuid_out, uuid, sizeof(uuid)); | |
233 | return 0; | |
234 | } | |
235 | ||
236 | /** | |
237 | * nd_uuid_store: common implementation for writing 'uuid' sysfs attributes | |
238 | * @dev: container device for the uuid property | |
239 | * @uuid_out: uuid buffer to replace | |
240 | * @buf: raw sysfs buffer to parse | |
241 | * | |
242 | * Enforce that uuids can only be changed while the device is disabled | |
243 | * (driver detached) | |
244 | * LOCKING: expects device_lock() is held on entry | |
245 | */ | |
246 | int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf, | |
247 | size_t len) | |
248 | { | |
249 | u8 uuid[16]; | |
250 | int rc; | |
251 | ||
252 | if (dev->driver) | |
253 | return -EBUSY; | |
254 | ||
255 | rc = nd_uuid_parse(dev, uuid, buf, len); | |
256 | if (rc) | |
257 | return rc; | |
258 | ||
259 | kfree(*uuid_out); | |
260 | *uuid_out = kmemdup(uuid, sizeof(uuid), GFP_KERNEL); | |
261 | if (!(*uuid_out)) | |
262 | return -ENOMEM; | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
1b40e09a DW |
267 | ssize_t nd_sector_size_show(unsigned long current_lbasize, |
268 | const unsigned long *supported, char *buf) | |
269 | { | |
270 | ssize_t len = 0; | |
271 | int i; | |
272 | ||
273 | for (i = 0; supported[i]; i++) | |
274 | if (current_lbasize == supported[i]) | |
275 | len += sprintf(buf + len, "[%ld] ", supported[i]); | |
276 | else | |
277 | len += sprintf(buf + len, "%ld ", supported[i]); | |
278 | len += sprintf(buf + len, "\n"); | |
279 | return len; | |
280 | } | |
281 | ||
282 | ssize_t nd_sector_size_store(struct device *dev, const char *buf, | |
283 | unsigned long *current_lbasize, const unsigned long *supported) | |
284 | { | |
285 | unsigned long lbasize; | |
286 | int rc, i; | |
287 | ||
288 | if (dev->driver) | |
289 | return -EBUSY; | |
290 | ||
291 | rc = kstrtoul(buf, 0, &lbasize); | |
292 | if (rc) | |
293 | return rc; | |
294 | ||
295 | for (i = 0; supported[i]; i++) | |
296 | if (lbasize == supported[i]) | |
297 | break; | |
298 | ||
299 | if (supported[i]) { | |
300 | *current_lbasize = lbasize; | |
301 | return 0; | |
302 | } else { | |
303 | return -EINVAL; | |
304 | } | |
305 | } | |
306 | ||
f0dc089c DW |
307 | void __nd_iostat_start(struct bio *bio, unsigned long *start) |
308 | { | |
309 | struct gendisk *disk = bio->bi_bdev->bd_disk; | |
310 | const int rw = bio_data_dir(bio); | |
311 | int cpu = part_stat_lock(); | |
312 | ||
313 | *start = jiffies; | |
314 | part_round_stats(cpu, &disk->part0); | |
315 | part_stat_inc(cpu, &disk->part0, ios[rw]); | |
316 | part_stat_add(cpu, &disk->part0, sectors[rw], bio_sectors(bio)); | |
317 | part_inc_in_flight(&disk->part0, rw); | |
318 | part_stat_unlock(); | |
319 | } | |
320 | EXPORT_SYMBOL(__nd_iostat_start); | |
321 | ||
322 | void nd_iostat_end(struct bio *bio, unsigned long start) | |
323 | { | |
324 | struct gendisk *disk = bio->bi_bdev->bd_disk; | |
325 | unsigned long duration = jiffies - start; | |
326 | const int rw = bio_data_dir(bio); | |
327 | int cpu = part_stat_lock(); | |
328 | ||
329 | part_stat_add(cpu, &disk->part0, ticks[rw], duration); | |
330 | part_round_stats(cpu, &disk->part0); | |
331 | part_dec_in_flight(&disk->part0, rw); | |
332 | part_stat_unlock(); | |
333 | } | |
334 | EXPORT_SYMBOL(nd_iostat_end); | |
335 | ||
62232e45 DW |
336 | static ssize_t commands_show(struct device *dev, |
337 | struct device_attribute *attr, char *buf) | |
338 | { | |
339 | int cmd, len = 0; | |
340 | struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); | |
341 | struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; | |
342 | ||
e3654eca | 343 | for_each_set_bit(cmd, &nd_desc->cmd_mask, BITS_PER_LONG) |
62232e45 DW |
344 | len += sprintf(buf + len, "%s ", nvdimm_bus_cmd_name(cmd)); |
345 | len += sprintf(buf + len, "\n"); | |
346 | return len; | |
347 | } | |
348 | static DEVICE_ATTR_RO(commands); | |
349 | ||
45def22c DW |
350 | static const char *nvdimm_bus_provider(struct nvdimm_bus *nvdimm_bus) |
351 | { | |
352 | struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; | |
353 | struct device *parent = nvdimm_bus->dev.parent; | |
354 | ||
355 | if (nd_desc->provider_name) | |
356 | return nd_desc->provider_name; | |
357 | else if (parent) | |
358 | return dev_name(parent); | |
359 | else | |
360 | return "unknown"; | |
361 | } | |
362 | ||
363 | static ssize_t provider_show(struct device *dev, | |
364 | struct device_attribute *attr, char *buf) | |
365 | { | |
366 | struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); | |
367 | ||
368 | return sprintf(buf, "%s\n", nvdimm_bus_provider(nvdimm_bus)); | |
369 | } | |
370 | static DEVICE_ATTR_RO(provider); | |
371 | ||
4d88a97a DW |
372 | static int flush_namespaces(struct device *dev, void *data) |
373 | { | |
374 | device_lock(dev); | |
375 | device_unlock(dev); | |
376 | return 0; | |
377 | } | |
378 | ||
379 | static int flush_regions_dimms(struct device *dev, void *data) | |
380 | { | |
381 | device_lock(dev); | |
382 | device_unlock(dev); | |
383 | device_for_each_child(dev, NULL, flush_namespaces); | |
384 | return 0; | |
385 | } | |
386 | ||
387 | static ssize_t wait_probe_show(struct device *dev, | |
388 | struct device_attribute *attr, char *buf) | |
389 | { | |
7ae0fa43 DW |
390 | struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); |
391 | struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; | |
392 | int rc; | |
393 | ||
394 | if (nd_desc->flush_probe) { | |
395 | rc = nd_desc->flush_probe(nd_desc); | |
396 | if (rc) | |
397 | return rc; | |
398 | } | |
4d88a97a DW |
399 | nd_synchronize(); |
400 | device_for_each_child(dev, NULL, flush_regions_dimms); | |
401 | return sprintf(buf, "1\n"); | |
402 | } | |
403 | static DEVICE_ATTR_RO(wait_probe); | |
404 | ||
45def22c | 405 | static struct attribute *nvdimm_bus_attributes[] = { |
62232e45 | 406 | &dev_attr_commands.attr, |
4d88a97a | 407 | &dev_attr_wait_probe.attr, |
45def22c DW |
408 | &dev_attr_provider.attr, |
409 | NULL, | |
410 | }; | |
411 | ||
412 | struct attribute_group nvdimm_bus_attribute_group = { | |
413 | .attrs = nvdimm_bus_attributes, | |
414 | }; | |
415 | EXPORT_SYMBOL_GPL(nvdimm_bus_attribute_group); | |
416 | ||
b95f5f43 | 417 | static void set_badblock(struct badblocks *bb, sector_t s, int num) |
87ba05df | 418 | { |
b95f5f43 | 419 | dev_dbg(bb->dev, "Found a poison range (0x%llx, 0x%llx)\n", |
87ba05df DW |
420 | (u64) s * 512, (u64) num * 512); |
421 | /* this isn't an error as the hardware will still throw an exception */ | |
b95f5f43 DW |
422 | if (badblocks_set(bb, s, num, 1)) |
423 | dev_info_once(bb->dev, "%s: failed for sector %llx\n", | |
87ba05df DW |
424 | __func__, (u64) s); |
425 | } | |
426 | ||
0caeef63 VV |
427 | /** |
428 | * __add_badblock_range() - Convert a physical address range to bad sectors | |
b95f5f43 | 429 | * @bb: badblocks instance to populate |
0caeef63 VV |
430 | * @ns_offset: namespace offset where the error range begins (in bytes) |
431 | * @len: number of bytes of poison to be added | |
432 | * | |
433 | * This assumes that the range provided with (ns_offset, len) is within | |
434 | * the bounds of physical addresses for this namespace, i.e. lies in the | |
435 | * interval [ns_start, ns_start + ns_size) | |
436 | */ | |
b95f5f43 | 437 | static void __add_badblock_range(struct badblocks *bb, u64 ns_offset, u64 len) |
0caeef63 | 438 | { |
b95f5f43 | 439 | const unsigned int sector_size = 512; |
0caeef63 VV |
440 | sector_t start_sector; |
441 | u64 num_sectors; | |
442 | u32 rem; | |
0caeef63 VV |
443 | |
444 | start_sector = div_u64(ns_offset, sector_size); | |
445 | num_sectors = div_u64_rem(len, sector_size, &rem); | |
446 | if (rem) | |
447 | num_sectors++; | |
448 | ||
0caeef63 VV |
449 | if (unlikely(num_sectors > (u64)INT_MAX)) { |
450 | u64 remaining = num_sectors; | |
451 | sector_t s = start_sector; | |
452 | ||
453 | while (remaining) { | |
454 | int done = min_t(u64, remaining, INT_MAX); | |
455 | ||
b95f5f43 | 456 | set_badblock(bb, s, done); |
0caeef63 VV |
457 | remaining -= done; |
458 | s += done; | |
459 | } | |
0caeef63 | 460 | } else |
b95f5f43 | 461 | set_badblock(bb, start_sector, num_sectors); |
0caeef63 VV |
462 | } |
463 | ||
a3901802 DW |
464 | static void badblocks_populate(struct list_head *poison_list, |
465 | struct badblocks *bb, const struct resource *res) | |
0caeef63 | 466 | { |
0caeef63 | 467 | struct nd_poison *pl; |
0caeef63 | 468 | |
0caeef63 | 469 | if (list_empty(poison_list)) |
b95f5f43 | 470 | return; |
0caeef63 VV |
471 | |
472 | list_for_each_entry(pl, poison_list, list) { | |
473 | u64 pl_end = pl->start + pl->length - 1; | |
474 | ||
475 | /* Discard intervals with no intersection */ | |
5faecf4e | 476 | if (pl_end < res->start) |
0caeef63 | 477 | continue; |
5faecf4e | 478 | if (pl->start > res->end) |
0caeef63 VV |
479 | continue; |
480 | /* Deal with any overlap after start of the namespace */ | |
5faecf4e | 481 | if (pl->start >= res->start) { |
0caeef63 VV |
482 | u64 start = pl->start; |
483 | u64 len; | |
484 | ||
5faecf4e | 485 | if (pl_end <= res->end) |
0caeef63 VV |
486 | len = pl->length; |
487 | else | |
5faecf4e DW |
488 | len = res->start + resource_size(res) |
489 | - pl->start; | |
490 | __add_badblock_range(bb, start - res->start, len); | |
0caeef63 VV |
491 | continue; |
492 | } | |
493 | /* Deal with overlap for poison starting before the namespace */ | |
5faecf4e | 494 | if (pl->start < res->start) { |
0caeef63 VV |
495 | u64 len; |
496 | ||
5faecf4e DW |
497 | if (pl_end < res->end) |
498 | len = pl->start + pl->length - res->start; | |
0caeef63 | 499 | else |
5faecf4e | 500 | len = resource_size(res); |
b95f5f43 | 501 | __add_badblock_range(bb, 0, len); |
0caeef63 VV |
502 | } |
503 | } | |
0caeef63 | 504 | } |
5faecf4e DW |
505 | |
506 | /** | |
a3901802 DW |
507 | * nvdimm_badblocks_populate() - Convert a list of poison ranges to badblocks |
508 | * @region: parent region of the range to interrogate | |
509 | * @bb: badblocks instance to populate | |
510 | * @res: resource range to consider | |
5faecf4e | 511 | * |
a3901802 DW |
512 | * The poison list generated during bus initialization may contain |
513 | * multiple, possibly overlapping physical address ranges. Compare each | |
514 | * of these ranges to the resource range currently being initialized, | |
515 | * and add badblocks entries for all matching sub-ranges | |
5faecf4e | 516 | */ |
a3901802 DW |
517 | void nvdimm_badblocks_populate(struct nd_region *nd_region, |
518 | struct badblocks *bb, const struct resource *res) | |
5faecf4e | 519 | { |
5faecf4e DW |
520 | struct nvdimm_bus *nvdimm_bus; |
521 | struct list_head *poison_list; | |
5faecf4e | 522 | |
a3901802 DW |
523 | if (!is_nd_pmem(&nd_region->dev)) { |
524 | dev_WARN_ONCE(&nd_region->dev, 1, | |
525 | "%s only valid for pmem regions\n", __func__); | |
526 | return; | |
527 | } | |
528 | nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev); | |
5faecf4e DW |
529 | poison_list = &nvdimm_bus->poison_list; |
530 | ||
531 | nvdimm_bus_lock(&nvdimm_bus->dev); | |
a3901802 | 532 | badblocks_populate(poison_list, bb, res); |
5faecf4e DW |
533 | nvdimm_bus_unlock(&nvdimm_bus->dev); |
534 | } | |
a3901802 | 535 | EXPORT_SYMBOL_GPL(nvdimm_badblocks_populate); |
0caeef63 | 536 | |
5faecf4e | 537 | static int add_poison(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length) |
0caeef63 VV |
538 | { |
539 | struct nd_poison *pl; | |
540 | ||
541 | pl = kzalloc(sizeof(*pl), GFP_KERNEL); | |
542 | if (!pl) | |
543 | return -ENOMEM; | |
544 | ||
545 | pl->start = addr; | |
546 | pl->length = length; | |
547 | list_add_tail(&pl->list, &nvdimm_bus->poison_list); | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
5faecf4e | 552 | static int bus_add_poison(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length) |
0caeef63 VV |
553 | { |
554 | struct nd_poison *pl; | |
555 | ||
556 | if (list_empty(&nvdimm_bus->poison_list)) | |
5faecf4e | 557 | return add_poison(nvdimm_bus, addr, length); |
0caeef63 VV |
558 | |
559 | /* | |
560 | * There is a chance this is a duplicate, check for those first. | |
561 | * This will be the common case as ARS_STATUS returns all known | |
562 | * errors in the SPA space, and we can't query it per region | |
563 | */ | |
564 | list_for_each_entry(pl, &nvdimm_bus->poison_list, list) | |
565 | if (pl->start == addr) { | |
566 | /* If length has changed, update this list entry */ | |
567 | if (pl->length != length) | |
568 | pl->length = length; | |
569 | return 0; | |
570 | } | |
571 | ||
572 | /* | |
573 | * If not a duplicate or a simple length update, add the entry as is, | |
574 | * as any overlapping ranges will get resolved when the list is consumed | |
575 | * and converted to badblocks | |
576 | */ | |
5faecf4e DW |
577 | return add_poison(nvdimm_bus, addr, length); |
578 | } | |
579 | ||
580 | int nvdimm_bus_add_poison(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length) | |
581 | { | |
582 | int rc; | |
583 | ||
584 | nvdimm_bus_lock(&nvdimm_bus->dev); | |
585 | rc = bus_add_poison(nvdimm_bus, addr, length); | |
586 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
587 | ||
588 | return rc; | |
0caeef63 VV |
589 | } |
590 | EXPORT_SYMBOL_GPL(nvdimm_bus_add_poison); | |
591 | ||
41cd8b70 | 592 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
41cd8b70 VV |
593 | int nd_integrity_init(struct gendisk *disk, unsigned long meta_size) |
594 | { | |
0f8087ec | 595 | struct blk_integrity bi; |
41cd8b70 | 596 | |
fcae6957 VV |
597 | if (meta_size == 0) |
598 | return 0; | |
599 | ||
8729bdea JT |
600 | memset(&bi, 0, sizeof(bi)); |
601 | ||
0f8087ec MP |
602 | bi.tuple_size = meta_size; |
603 | bi.tag_size = meta_size; | |
604 | ||
25520d55 | 605 | blk_integrity_register(disk, &bi); |
41cd8b70 VV |
606 | blk_queue_max_integrity_segments(disk->queue, 1); |
607 | ||
608 | return 0; | |
609 | } | |
610 | EXPORT_SYMBOL(nd_integrity_init); | |
611 | ||
612 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
613 | int nd_integrity_init(struct gendisk *disk, unsigned long meta_size) | |
614 | { | |
615 | return 0; | |
616 | } | |
617 | EXPORT_SYMBOL(nd_integrity_init); | |
618 | ||
619 | #endif | |
620 | ||
45def22c DW |
621 | static __init int libnvdimm_init(void) |
622 | { | |
4d88a97a DW |
623 | int rc; |
624 | ||
625 | rc = nvdimm_bus_init(); | |
626 | if (rc) | |
627 | return rc; | |
628 | rc = nvdimm_init(); | |
629 | if (rc) | |
630 | goto err_dimm; | |
3d88002e DW |
631 | rc = nd_region_init(); |
632 | if (rc) | |
633 | goto err_region; | |
4d88a97a | 634 | return 0; |
3d88002e DW |
635 | err_region: |
636 | nvdimm_exit(); | |
4d88a97a DW |
637 | err_dimm: |
638 | nvdimm_bus_exit(); | |
639 | return rc; | |
45def22c DW |
640 | } |
641 | ||
642 | static __exit void libnvdimm_exit(void) | |
643 | { | |
644 | WARN_ON(!list_empty(&nvdimm_bus_list)); | |
3d88002e | 645 | nd_region_exit(); |
4d88a97a | 646 | nvdimm_exit(); |
45def22c | 647 | nvdimm_bus_exit(); |
b354aba0 DW |
648 | nd_region_devs_exit(); |
649 | nvdimm_devs_exit(); | |
45def22c DW |
650 | } |
651 | ||
b94d5230 DW |
652 | MODULE_LICENSE("GPL v2"); |
653 | MODULE_AUTHOR("Intel Corporation"); | |
45def22c DW |
654 | subsys_initcall(libnvdimm_init); |
655 | module_exit(libnvdimm_exit); |