blob: cb62ec6a12d073cf1abd5422e151636d57d6f781 [file] [log] [blame]
Dan Williamsb94d5232015-05-19 22:54:31 -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 */
13#include <linux/libnvdimm.h>
14#include <linux/export.h>
15#include <linux/module.h>
Vishal Verma41cd8b72015-06-25 04:21:52 -040016#include <linux/blkdev.h>
Dan Williamsb94d5232015-05-19 22:54:31 -040017#include <linux/device.h>
Dan Williamsbf9bccc2015-06-17 17:14:46 -040018#include <linux/ctype.h>
Dan Williams62232e452015-06-08 14:27:06 -040019#include <linux/ndctl.h>
Dan Williams45def222015-04-26 19:26:48 -040020#include <linux/mutex.h>
Dan Williamsb94d5232015-05-19 22:54:31 -040021#include <linux/slab.h>
22#include "nd-core.h"
Dan Williams4d88a972015-05-31 14:41:48 -040023#include "nd.h"
Dan Williamsb94d5232015-05-19 22:54:31 -040024
Dan Williamse6dfb2d2015-04-25 03:56:17 -040025LIST_HEAD(nvdimm_bus_list);
26DEFINE_MUTEX(nvdimm_bus_list_mutex);
Dan Williamsb94d5232015-05-19 22:54:31 -040027static DEFINE_IDA(nd_ida);
28
Dan Williams3d880022015-05-31 15:02:11 -040029void nvdimm_bus_lock(struct device *dev)
30{
31 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
32
33 if (!nvdimm_bus)
34 return;
35 mutex_lock(&nvdimm_bus->reconfig_mutex);
36}
37EXPORT_SYMBOL(nvdimm_bus_lock);
38
39void nvdimm_bus_unlock(struct device *dev)
40{
41 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
42
43 if (!nvdimm_bus)
44 return;
45 mutex_unlock(&nvdimm_bus->reconfig_mutex);
46}
47EXPORT_SYMBOL(nvdimm_bus_unlock);
48
49bool is_nvdimm_bus_locked(struct device *dev)
50{
51 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
52
53 if (!nvdimm_bus)
54 return false;
55 return mutex_is_locked(&nvdimm_bus->reconfig_mutex);
56}
57EXPORT_SYMBOL(is_nvdimm_bus_locked);
58
Dan Williamseaf96152015-05-01 13:11:27 -040059u64 nd_fletcher64(void *addr, size_t len, bool le)
60{
61 u32 *buf = addr;
62 u32 lo32 = 0;
63 u64 hi32 = 0;
64 int i;
65
66 for (i = 0; i < len / sizeof(u32); i++) {
67 lo32 += le ? le32_to_cpu((__le32) buf[i]) : buf[i];
68 hi32 += lo32;
69 }
70
71 return hi32 << 32 | lo32;
72}
73EXPORT_SYMBOL_GPL(nd_fletcher64);
74
Dan Williamsb94d5232015-05-19 22:54:31 -040075static void nvdimm_bus_release(struct device *dev)
76{
77 struct nvdimm_bus *nvdimm_bus;
78
79 nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
80 ida_simple_remove(&nd_ida, nvdimm_bus->id);
81 kfree(nvdimm_bus);
82}
83
Dan Williams45def222015-04-26 19:26:48 -040084struct nvdimm_bus *to_nvdimm_bus(struct device *dev)
85{
86 struct nvdimm_bus *nvdimm_bus;
87
88 nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
89 WARN_ON(nvdimm_bus->dev.release != nvdimm_bus_release);
90 return nvdimm_bus;
91}
92EXPORT_SYMBOL_GPL(to_nvdimm_bus);
93
94struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus)
95{
96 /* struct nvdimm_bus definition is private to libnvdimm */
97 return nvdimm_bus->nd_desc;
98}
99EXPORT_SYMBOL_GPL(to_nd_desc);
100
Dan Williamse6dfb2d2015-04-25 03:56:17 -0400101struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev)
102{
103 struct device *dev;
104
105 for (dev = nd_dev; dev; dev = dev->parent)
106 if (dev->release == nvdimm_bus_release)
107 break;
108 dev_WARN_ONCE(nd_dev, !dev, "invalid dev, not on nd bus\n");
109 if (dev)
110 return to_nvdimm_bus(dev);
111 return NULL;
112}
113
Dan Williamsbf9bccc2015-06-17 17:14:46 -0400114static bool is_uuid_sep(char sep)
115{
116 if (sep == '\n' || sep == '-' || sep == ':' || sep == '\0')
117 return true;
118 return false;
119}
120
121static int nd_uuid_parse(struct device *dev, u8 *uuid_out, const char *buf,
122 size_t len)
123{
124 const char *str = buf;
125 u8 uuid[16];
126 int i;
127
128 for (i = 0; i < 16; i++) {
129 if (!isxdigit(str[0]) || !isxdigit(str[1])) {
130 dev_dbg(dev, "%s: pos: %d buf[%zd]: %c buf[%zd]: %c\n",
131 __func__, i, str - buf, str[0],
132 str + 1 - buf, str[1]);
133 return -EINVAL;
134 }
135
136 uuid[i] = (hex_to_bin(str[0]) << 4) | hex_to_bin(str[1]);
137 str += 2;
138 if (is_uuid_sep(*str))
139 str++;
140 }
141
142 memcpy(uuid_out, uuid, sizeof(uuid));
143 return 0;
144}
145
146/**
147 * nd_uuid_store: common implementation for writing 'uuid' sysfs attributes
148 * @dev: container device for the uuid property
149 * @uuid_out: uuid buffer to replace
150 * @buf: raw sysfs buffer to parse
151 *
152 * Enforce that uuids can only be changed while the device is disabled
153 * (driver detached)
154 * LOCKING: expects device_lock() is held on entry
155 */
156int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
157 size_t len)
158{
159 u8 uuid[16];
160 int rc;
161
162 if (dev->driver)
163 return -EBUSY;
164
165 rc = nd_uuid_parse(dev, uuid, buf, len);
166 if (rc)
167 return rc;
168
169 kfree(*uuid_out);
170 *uuid_out = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
171 if (!(*uuid_out))
172 return -ENOMEM;
173
174 return 0;
175}
176
Dan Williams1b40e092015-05-01 13:34:01 -0400177ssize_t nd_sector_size_show(unsigned long current_lbasize,
178 const unsigned long *supported, char *buf)
179{
180 ssize_t len = 0;
181 int i;
182
183 for (i = 0; supported[i]; i++)
184 if (current_lbasize == supported[i])
185 len += sprintf(buf + len, "[%ld] ", supported[i]);
186 else
187 len += sprintf(buf + len, "%ld ", supported[i]);
188 len += sprintf(buf + len, "\n");
189 return len;
190}
191
192ssize_t nd_sector_size_store(struct device *dev, const char *buf,
193 unsigned long *current_lbasize, const unsigned long *supported)
194{
195 unsigned long lbasize;
196 int rc, i;
197
198 if (dev->driver)
199 return -EBUSY;
200
201 rc = kstrtoul(buf, 0, &lbasize);
202 if (rc)
203 return rc;
204
205 for (i = 0; supported[i]; i++)
206 if (lbasize == supported[i])
207 break;
208
209 if (supported[i]) {
210 *current_lbasize = lbasize;
211 return 0;
212 } else {
213 return -EINVAL;
214 }
215}
216
Dan Williamsf0dc0892015-05-16 12:28:53 -0400217void __nd_iostat_start(struct bio *bio, unsigned long *start)
218{
219 struct gendisk *disk = bio->bi_bdev->bd_disk;
220 const int rw = bio_data_dir(bio);
221 int cpu = part_stat_lock();
222
223 *start = jiffies;
224 part_round_stats(cpu, &disk->part0);
225 part_stat_inc(cpu, &disk->part0, ios[rw]);
226 part_stat_add(cpu, &disk->part0, sectors[rw], bio_sectors(bio));
227 part_inc_in_flight(&disk->part0, rw);
228 part_stat_unlock();
229}
230EXPORT_SYMBOL(__nd_iostat_start);
231
232void nd_iostat_end(struct bio *bio, unsigned long start)
233{
234 struct gendisk *disk = bio->bi_bdev->bd_disk;
235 unsigned long duration = jiffies - start;
236 const int rw = bio_data_dir(bio);
237 int cpu = part_stat_lock();
238
239 part_stat_add(cpu, &disk->part0, ticks[rw], duration);
240 part_round_stats(cpu, &disk->part0);
241 part_dec_in_flight(&disk->part0, rw);
242 part_stat_unlock();
243}
244EXPORT_SYMBOL(nd_iostat_end);
245
Dan Williams62232e452015-06-08 14:27:06 -0400246static ssize_t commands_show(struct device *dev,
247 struct device_attribute *attr, char *buf)
248{
249 int cmd, len = 0;
250 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
251 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
252
253 for_each_set_bit(cmd, &nd_desc->dsm_mask, BITS_PER_LONG)
254 len += sprintf(buf + len, "%s ", nvdimm_bus_cmd_name(cmd));
255 len += sprintf(buf + len, "\n");
256 return len;
257}
258static DEVICE_ATTR_RO(commands);
259
Dan Williams45def222015-04-26 19:26:48 -0400260static const char *nvdimm_bus_provider(struct nvdimm_bus *nvdimm_bus)
261{
262 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
263 struct device *parent = nvdimm_bus->dev.parent;
264
265 if (nd_desc->provider_name)
266 return nd_desc->provider_name;
267 else if (parent)
268 return dev_name(parent);
269 else
270 return "unknown";
271}
272
273static ssize_t provider_show(struct device *dev,
274 struct device_attribute *attr, char *buf)
275{
276 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
277
278 return sprintf(buf, "%s\n", nvdimm_bus_provider(nvdimm_bus));
279}
280static DEVICE_ATTR_RO(provider);
281
Dan Williams4d88a972015-05-31 14:41:48 -0400282static int flush_namespaces(struct device *dev, void *data)
283{
284 device_lock(dev);
285 device_unlock(dev);
286 return 0;
287}
288
289static int flush_regions_dimms(struct device *dev, void *data)
290{
291 device_lock(dev);
292 device_unlock(dev);
293 device_for_each_child(dev, NULL, flush_namespaces);
294 return 0;
295}
296
297static ssize_t wait_probe_show(struct device *dev,
298 struct device_attribute *attr, char *buf)
299{
300 nd_synchronize();
301 device_for_each_child(dev, NULL, flush_regions_dimms);
302 return sprintf(buf, "1\n");
303}
304static DEVICE_ATTR_RO(wait_probe);
305
Dan Williams45def222015-04-26 19:26:48 -0400306static struct attribute *nvdimm_bus_attributes[] = {
Dan Williams62232e452015-06-08 14:27:06 -0400307 &dev_attr_commands.attr,
Dan Williams4d88a972015-05-31 14:41:48 -0400308 &dev_attr_wait_probe.attr,
Dan Williams45def222015-04-26 19:26:48 -0400309 &dev_attr_provider.attr,
310 NULL,
311};
312
313struct attribute_group nvdimm_bus_attribute_group = {
314 .attrs = nvdimm_bus_attributes,
315};
316EXPORT_SYMBOL_GPL(nvdimm_bus_attribute_group);
317
Dan Williams3d880022015-05-31 15:02:11 -0400318struct nvdimm_bus *__nvdimm_bus_register(struct device *parent,
319 struct nvdimm_bus_descriptor *nd_desc, struct module *module)
Dan Williamsb94d5232015-05-19 22:54:31 -0400320{
321 struct nvdimm_bus *nvdimm_bus;
322 int rc;
323
324 nvdimm_bus = kzalloc(sizeof(*nvdimm_bus), GFP_KERNEL);
325 if (!nvdimm_bus)
326 return NULL;
Dan Williams45def222015-04-26 19:26:48 -0400327 INIT_LIST_HEAD(&nvdimm_bus->list);
Dan Williamseaf96152015-05-01 13:11:27 -0400328 init_waitqueue_head(&nvdimm_bus->probe_wait);
Dan Williamsb94d5232015-05-19 22:54:31 -0400329 nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
Dan Williams3d880022015-05-31 15:02:11 -0400330 mutex_init(&nvdimm_bus->reconfig_mutex);
Dan Williamsb94d5232015-05-19 22:54:31 -0400331 if (nvdimm_bus->id < 0) {
332 kfree(nvdimm_bus);
333 return NULL;
334 }
335 nvdimm_bus->nd_desc = nd_desc;
Dan Williams3d880022015-05-31 15:02:11 -0400336 nvdimm_bus->module = module;
Dan Williamsb94d5232015-05-19 22:54:31 -0400337 nvdimm_bus->dev.parent = parent;
338 nvdimm_bus->dev.release = nvdimm_bus_release;
Dan Williams45def222015-04-26 19:26:48 -0400339 nvdimm_bus->dev.groups = nd_desc->attr_groups;
Dan Williamsb94d5232015-05-19 22:54:31 -0400340 dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id);
341 rc = device_register(&nvdimm_bus->dev);
342 if (rc) {
343 dev_dbg(&nvdimm_bus->dev, "registration failed: %d\n", rc);
Dan Williams45def222015-04-26 19:26:48 -0400344 goto err;
Dan Williamsb94d5232015-05-19 22:54:31 -0400345 }
346
Dan Williams45def222015-04-26 19:26:48 -0400347 rc = nvdimm_bus_create_ndctl(nvdimm_bus);
348 if (rc)
349 goto err;
350
351 mutex_lock(&nvdimm_bus_list_mutex);
352 list_add_tail(&nvdimm_bus->list, &nvdimm_bus_list);
353 mutex_unlock(&nvdimm_bus_list_mutex);
354
Dan Williamsb94d5232015-05-19 22:54:31 -0400355 return nvdimm_bus;
Dan Williams45def222015-04-26 19:26:48 -0400356 err:
357 put_device(&nvdimm_bus->dev);
358 return NULL;
Dan Williamsb94d5232015-05-19 22:54:31 -0400359}
Dan Williams3d880022015-05-31 15:02:11 -0400360EXPORT_SYMBOL_GPL(__nvdimm_bus_register);
Dan Williamsb94d5232015-05-19 22:54:31 -0400361
Dan Williamse6dfb2d2015-04-25 03:56:17 -0400362static int child_unregister(struct device *dev, void *data)
363{
364 /*
365 * the singular ndctl class device per bus needs to be
366 * "device_destroy"ed, so skip it here
367 *
368 * i.e. remove classless children
369 */
370 if (dev->class)
371 /* pass */;
372 else
Dan Williams4d88a972015-05-31 14:41:48 -0400373 nd_device_unregister(dev, ND_SYNC);
Dan Williamse6dfb2d2015-04-25 03:56:17 -0400374 return 0;
375}
376
Dan Williamsb94d5232015-05-19 22:54:31 -0400377void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)
378{
379 if (!nvdimm_bus)
380 return;
Dan Williams45def222015-04-26 19:26:48 -0400381
382 mutex_lock(&nvdimm_bus_list_mutex);
383 list_del_init(&nvdimm_bus->list);
384 mutex_unlock(&nvdimm_bus_list_mutex);
385
Dan Williams4d88a972015-05-31 14:41:48 -0400386 nd_synchronize();
Dan Williamse6dfb2d2015-04-25 03:56:17 -0400387 device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister);
Dan Williams45def222015-04-26 19:26:48 -0400388 nvdimm_bus_destroy_ndctl(nvdimm_bus);
389
Dan Williamsb94d5232015-05-19 22:54:31 -0400390 device_unregister(&nvdimm_bus->dev);
391}
392EXPORT_SYMBOL_GPL(nvdimm_bus_unregister);
393
Vishal Verma41cd8b72015-06-25 04:21:52 -0400394#ifdef CONFIG_BLK_DEV_INTEGRITY
395static int nd_pi_nop_generate_verify(struct blk_integrity_iter *iter)
396{
397 return 0;
398}
399
400int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
401{
402 struct blk_integrity integrity = {
403 .name = "ND-PI-NOP",
404 .generate_fn = nd_pi_nop_generate_verify,
405 .verify_fn = nd_pi_nop_generate_verify,
406 .tuple_size = meta_size,
407 .tag_size = meta_size,
408 };
409 int ret;
410
Vishal Vermafcae6952015-06-25 04:22:39 -0400411 if (meta_size == 0)
412 return 0;
413
Vishal Verma41cd8b72015-06-25 04:21:52 -0400414 ret = blk_integrity_register(disk, &integrity);
415 if (ret)
416 return ret;
417
418 blk_queue_max_integrity_segments(disk->queue, 1);
419
420 return 0;
421}
422EXPORT_SYMBOL(nd_integrity_init);
423
424#else /* CONFIG_BLK_DEV_INTEGRITY */
425int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
426{
427 return 0;
428}
429EXPORT_SYMBOL(nd_integrity_init);
430
431#endif
432
Dan Williams45def222015-04-26 19:26:48 -0400433static __init int libnvdimm_init(void)
434{
Dan Williams4d88a972015-05-31 14:41:48 -0400435 int rc;
436
437 rc = nvdimm_bus_init();
438 if (rc)
439 return rc;
440 rc = nvdimm_init();
441 if (rc)
442 goto err_dimm;
Dan Williams3d880022015-05-31 15:02:11 -0400443 rc = nd_region_init();
444 if (rc)
445 goto err_region;
Dan Williams4d88a972015-05-31 14:41:48 -0400446 return 0;
Dan Williams3d880022015-05-31 15:02:11 -0400447 err_region:
448 nvdimm_exit();
Dan Williams4d88a972015-05-31 14:41:48 -0400449 err_dimm:
450 nvdimm_bus_exit();
451 return rc;
Dan Williams45def222015-04-26 19:26:48 -0400452}
453
454static __exit void libnvdimm_exit(void)
455{
456 WARN_ON(!list_empty(&nvdimm_bus_list));
Dan Williams3d880022015-05-31 15:02:11 -0400457 nd_region_exit();
Dan Williams4d88a972015-05-31 14:41:48 -0400458 nvdimm_exit();
Dan Williams45def222015-04-26 19:26:48 -0400459 nvdimm_bus_exit();
460}
461
Dan Williamsb94d5232015-05-19 22:54:31 -0400462MODULE_LICENSE("GPL v2");
463MODULE_AUTHOR("Intel Corporation");
Dan Williams45def222015-04-26 19:26:48 -0400464subsys_initcall(libnvdimm_init);
465module_exit(libnvdimm_exit);