1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
4 */
5 #include <linux/libnvdimm.h>
6 #include <linux/badblocks.h>
7 #include <linux/suspend.h>
8 #include <linux/export.h>
9 #include <linux/module.h>
10 #include <linux/blkdev.h>
11 #include <linux/device.h>
12 #include <linux/ctype.h>
13 #include <linux/ndctl.h>
14 #include <linux/mutex.h>
15 #include <linux/slab.h>
16 #include <linux/io.h>
17 #include "nd-core.h"
18 #include "nd.h"
19
20 LIST_HEAD(nvdimm_bus_list);
21 DEFINE_MUTEX(nvdimm_bus_list_mutex);
22
nvdimm_bus_lock(struct device * dev)23 void nvdimm_bus_lock(struct device *dev)
24 {
25 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
26
27 if (!nvdimm_bus)
28 return;
29 mutex_lock(&nvdimm_bus->reconfig_mutex);
30 }
31 EXPORT_SYMBOL(nvdimm_bus_lock);
32
nvdimm_bus_unlock(struct device * dev)33 void nvdimm_bus_unlock(struct device *dev)
34 {
35 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
36
37 if (!nvdimm_bus)
38 return;
39 mutex_unlock(&nvdimm_bus->reconfig_mutex);
40 }
41 EXPORT_SYMBOL(nvdimm_bus_unlock);
42
is_nvdimm_bus_locked(struct device * dev)43 bool is_nvdimm_bus_locked(struct device *dev)
44 {
45 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
46
47 if (!nvdimm_bus)
48 return false;
49 return mutex_is_locked(&nvdimm_bus->reconfig_mutex);
50 }
51 EXPORT_SYMBOL(is_nvdimm_bus_locked);
52
53 struct nvdimm_map {
54 struct nvdimm_bus *nvdimm_bus;
55 struct list_head list;
56 resource_size_t offset;
57 unsigned long flags;
58 size_t size;
59 union {
60 void *mem;
61 void __iomem *iomem;
62 };
63 struct kref kref;
64 };
65
find_nvdimm_map(struct device * dev,resource_size_t offset)66 static struct nvdimm_map *find_nvdimm_map(struct device *dev,
67 resource_size_t offset)
68 {
69 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
70 struct nvdimm_map *nvdimm_map;
71
72 list_for_each_entry(nvdimm_map, &nvdimm_bus->mapping_list, list)
73 if (nvdimm_map->offset == offset)
74 return nvdimm_map;
75 return NULL;
76 }
77
alloc_nvdimm_map(struct device * dev,resource_size_t offset,size_t size,unsigned long flags)78 static struct nvdimm_map *alloc_nvdimm_map(struct device *dev,
79 resource_size_t offset, size_t size, unsigned long flags)
80 {
81 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
82 struct nvdimm_map *nvdimm_map;
83
84 nvdimm_map = kzalloc(sizeof(*nvdimm_map), GFP_KERNEL);
85 if (!nvdimm_map)
86 return NULL;
87
88 INIT_LIST_HEAD(&nvdimm_map->list);
89 nvdimm_map->nvdimm_bus = nvdimm_bus;
90 nvdimm_map->offset = offset;
91 nvdimm_map->flags = flags;
92 nvdimm_map->size = size;
93 kref_init(&nvdimm_map->kref);
94
95 if (!request_mem_region(offset, size, dev_name(&nvdimm_bus->dev))) {
96 dev_err(&nvdimm_bus->dev, "failed to request %pa + %zd for %s\n",
97 &offset, size, dev_name(dev));
98 goto err_request_region;
99 }
100
101 if (flags)
102 nvdimm_map->mem = memremap(offset, size, flags);
103 else
104 nvdimm_map->iomem = ioremap(offset, size);
105
106 if (!nvdimm_map->mem)
107 goto err_map;
108
109 dev_WARN_ONCE(dev, !is_nvdimm_bus_locked(dev), "%s: bus unlocked!",
110 __func__);
111 list_add(&nvdimm_map->list, &nvdimm_bus->mapping_list);
112
113 return nvdimm_map;
114
115 err_map:
116 release_mem_region(offset, size);
117 err_request_region:
118 kfree(nvdimm_map);
119 return NULL;
120 }
121
nvdimm_map_release(struct kref * kref)122 static void nvdimm_map_release(struct kref *kref)
123 {
124 struct nvdimm_bus *nvdimm_bus;
125 struct nvdimm_map *nvdimm_map;
126
127 nvdimm_map = container_of(kref, struct nvdimm_map, kref);
128 nvdimm_bus = nvdimm_map->nvdimm_bus;
129
130 dev_dbg(&nvdimm_bus->dev, "%pa\n", &nvdimm_map->offset);
131 list_del(&nvdimm_map->list);
132 if (nvdimm_map->flags)
133 memunmap(nvdimm_map->mem);
134 else
135 iounmap(nvdimm_map->iomem);
136 release_mem_region(nvdimm_map->offset, nvdimm_map->size);
137 kfree(nvdimm_map);
138 }
139
nvdimm_map_put(void * data)140 static void nvdimm_map_put(void *data)
141 {
142 struct nvdimm_map *nvdimm_map = data;
143 struct nvdimm_bus *nvdimm_bus = nvdimm_map->nvdimm_bus;
144
145 nvdimm_bus_lock(&nvdimm_bus->dev);
146 kref_put(&nvdimm_map->kref, nvdimm_map_release);
147 nvdimm_bus_unlock(&nvdimm_bus->dev);
148 }
149
150 /**
151 * devm_nvdimm_memremap - map a resource that is shared across regions
152 * @dev: device that will own a reference to the shared mapping
153 * @offset: physical base address of the mapping
154 * @size: mapping size
155 * @flags: memremap flags, or, if zero, perform an ioremap instead
156 */
devm_nvdimm_memremap(struct device * dev,resource_size_t offset,size_t size,unsigned long flags)157 void *devm_nvdimm_memremap(struct device *dev, resource_size_t offset,
158 size_t size, unsigned long flags)
159 {
160 struct nvdimm_map *nvdimm_map;
161
162 nvdimm_bus_lock(dev);
163 nvdimm_map = find_nvdimm_map(dev, offset);
164 if (!nvdimm_map)
165 nvdimm_map = alloc_nvdimm_map(dev, offset, size, flags);
166 else
167 kref_get(&nvdimm_map->kref);
168 nvdimm_bus_unlock(dev);
169
170 if (!nvdimm_map)
171 return NULL;
172
173 if (devm_add_action_or_reset(dev, nvdimm_map_put, nvdimm_map))
174 return NULL;
175
176 return nvdimm_map->mem;
177 }
178 EXPORT_SYMBOL_GPL(devm_nvdimm_memremap);
179
nd_fletcher64(void * addr,size_t len,bool le)180 u64 nd_fletcher64(void *addr, size_t len, bool le)
181 {
182 u32 *buf = addr;
183 u32 lo32 = 0;
184 u64 hi32 = 0;
185 int i;
186
187 for (i = 0; i < len / sizeof(u32); i++) {
188 lo32 += le ? le32_to_cpu((__le32) buf[i]) : buf[i];
189 hi32 += lo32;
190 }
191
192 return hi32 << 32 | lo32;
193 }
194 EXPORT_SYMBOL_GPL(nd_fletcher64);
195
to_nd_desc(struct nvdimm_bus * nvdimm_bus)196 struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus)
197 {
198 /* struct nvdimm_bus definition is private to libnvdimm */
199 return nvdimm_bus->nd_desc;
200 }
201 EXPORT_SYMBOL_GPL(to_nd_desc);
202
to_nvdimm_bus_dev(struct nvdimm_bus * nvdimm_bus)203 struct device *to_nvdimm_bus_dev(struct nvdimm_bus *nvdimm_bus)
204 {
205 /* struct nvdimm_bus definition is private to libnvdimm */
206 return &nvdimm_bus->dev;
207 }
208 EXPORT_SYMBOL_GPL(to_nvdimm_bus_dev);
209
is_uuid_sep(char sep)210 static bool is_uuid_sep(char sep)
211 {
212 if (sep == '\n' || sep == '-' || sep == ':' || sep == '\0')
213 return true;
214 return false;
215 }
216
nd_uuid_parse(struct device * dev,u8 * uuid_out,const char * buf,size_t len)217 static int nd_uuid_parse(struct device *dev, u8 *uuid_out, const char *buf,
218 size_t len)
219 {
220 const char *str = buf;
221 u8 uuid[16];
222 int i;
223
224 for (i = 0; i < 16; i++) {
225 if (!isxdigit(str[0]) || !isxdigit(str[1])) {
226 dev_dbg(dev, "pos: %d buf[%zd]: %c buf[%zd]: %c\n",
227 i, str - buf, str[0],
228 str + 1 - buf, str[1]);
229 return -EINVAL;
230 }
231
232 uuid[i] = (hex_to_bin(str[0]) << 4) | hex_to_bin(str[1]);
233 str += 2;
234 if (is_uuid_sep(*str))
235 str++;
236 }
237
238 memcpy(uuid_out, uuid, sizeof(uuid));
239 return 0;
240 }
241
242 /**
243 * nd_uuid_store: common implementation for writing 'uuid' sysfs attributes
244 * @dev: container device for the uuid property
245 * @uuid_out: uuid buffer to replace
246 * @buf: raw sysfs buffer to parse
247 *
248 * Enforce that uuids can only be changed while the device is disabled
249 * (driver detached)
250 * LOCKING: expects nd_device_lock() is held on entry
251 */
nd_uuid_store(struct device * dev,u8 ** uuid_out,const char * buf,size_t len)252 int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
253 size_t len)
254 {
255 u8 uuid[16];
256 int rc;
257
258 if (dev->driver)
259 return -EBUSY;
260
261 rc = nd_uuid_parse(dev, uuid, buf, len);
262 if (rc)
263 return rc;
264
265 kfree(*uuid_out);
266 *uuid_out = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
267 if (!(*uuid_out))
268 return -ENOMEM;
269
270 return 0;
271 }
272
nd_size_select_show(unsigned long current_size,const unsigned long * supported,char * buf)273 ssize_t nd_size_select_show(unsigned long current_size,
274 const unsigned long *supported, char *buf)
275 {
276 ssize_t len = 0;
277 int i;
278
279 for (i = 0; supported[i]; i++)
280 if (current_size == supported[i])
281 len += sprintf(buf + len, "[%ld] ", supported[i]);
282 else
283 len += sprintf(buf + len, "%ld ", supported[i]);
284 len += sprintf(buf + len, "\n");
285 return len;
286 }
287
nd_size_select_store(struct device * dev,const char * buf,unsigned long * current_size,const unsigned long * supported)288 ssize_t nd_size_select_store(struct device *dev, const char *buf,
289 unsigned long *current_size, const unsigned long *supported)
290 {
291 unsigned long lbasize;
292 int rc, i;
293
294 if (dev->driver)
295 return -EBUSY;
296
297 rc = kstrtoul(buf, 0, &lbasize);
298 if (rc)
299 return rc;
300
301 for (i = 0; supported[i]; i++)
302 if (lbasize == supported[i])
303 break;
304
305 if (supported[i]) {
306 *current_size = lbasize;
307 return 0;
308 } else {
309 return -EINVAL;
310 }
311 }
312
commands_show(struct device * dev,struct device_attribute * attr,char * buf)313 static ssize_t commands_show(struct device *dev,
314 struct device_attribute *attr, char *buf)
315 {
316 int cmd, len = 0;
317 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
318 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
319
320 for_each_set_bit(cmd, &nd_desc->cmd_mask, BITS_PER_LONG)
321 len += sprintf(buf + len, "%s ", nvdimm_bus_cmd_name(cmd));
322 len += sprintf(buf + len, "\n");
323 return len;
324 }
325 static DEVICE_ATTR_RO(commands);
326
nvdimm_bus_provider(struct nvdimm_bus * nvdimm_bus)327 static const char *nvdimm_bus_provider(struct nvdimm_bus *nvdimm_bus)
328 {
329 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
330 struct device *parent = nvdimm_bus->dev.parent;
331
332 if (nd_desc->provider_name)
333 return nd_desc->provider_name;
334 else if (parent)
335 return dev_name(parent);
336 else
337 return "unknown";
338 }
339
provider_show(struct device * dev,struct device_attribute * attr,char * buf)340 static ssize_t provider_show(struct device *dev,
341 struct device_attribute *attr, char *buf)
342 {
343 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
344
345 return sprintf(buf, "%s\n", nvdimm_bus_provider(nvdimm_bus));
346 }
347 static DEVICE_ATTR_RO(provider);
348
flush_namespaces(struct device * dev,void * data)349 static int flush_namespaces(struct device *dev, void *data)
350 {
351 nd_device_lock(dev);
352 nd_device_unlock(dev);
353 return 0;
354 }
355
flush_regions_dimms(struct device * dev,void * data)356 static int flush_regions_dimms(struct device *dev, void *data)
357 {
358 nd_device_lock(dev);
359 nd_device_unlock(dev);
360 device_for_each_child(dev, NULL, flush_namespaces);
361 return 0;
362 }
363
wait_probe_show(struct device * dev,struct device_attribute * attr,char * buf)364 static ssize_t wait_probe_show(struct device *dev,
365 struct device_attribute *attr, char *buf)
366 {
367 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
368 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
369 int rc;
370
371 if (nd_desc->flush_probe) {
372 rc = nd_desc->flush_probe(nd_desc);
373 if (rc)
374 return rc;
375 }
376 nd_synchronize();
377 device_for_each_child(dev, NULL, flush_regions_dimms);
378 return sprintf(buf, "1\n");
379 }
380 static DEVICE_ATTR_RO(wait_probe);
381
382 static struct attribute *nvdimm_bus_attributes[] = {
383 &dev_attr_commands.attr,
384 &dev_attr_wait_probe.attr,
385 &dev_attr_provider.attr,
386 NULL,
387 };
388
389 static const struct attribute_group nvdimm_bus_attribute_group = {
390 .attrs = nvdimm_bus_attributes,
391 };
392
capability_show(struct device * dev,struct device_attribute * attr,char * buf)393 static ssize_t capability_show(struct device *dev,
394 struct device_attribute *attr, char *buf)
395 {
396 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
397 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
398 enum nvdimm_fwa_capability cap;
399
400 if (!nd_desc->fw_ops)
401 return -EOPNOTSUPP;
402
403 nvdimm_bus_lock(dev);
404 cap = nd_desc->fw_ops->capability(nd_desc);
405 nvdimm_bus_unlock(dev);
406
407 switch (cap) {
408 case NVDIMM_FWA_CAP_QUIESCE:
409 return sprintf(buf, "quiesce\n");
410 case NVDIMM_FWA_CAP_LIVE:
411 return sprintf(buf, "live\n");
412 default:
413 return -EOPNOTSUPP;
414 }
415 }
416
417 static DEVICE_ATTR_RO(capability);
418
activate_show(struct device * dev,struct device_attribute * attr,char * buf)419 static ssize_t activate_show(struct device *dev,
420 struct device_attribute *attr, char *buf)
421 {
422 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
423 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
424 enum nvdimm_fwa_capability cap;
425 enum nvdimm_fwa_state state;
426
427 if (!nd_desc->fw_ops)
428 return -EOPNOTSUPP;
429
430 nvdimm_bus_lock(dev);
431 cap = nd_desc->fw_ops->capability(nd_desc);
432 state = nd_desc->fw_ops->activate_state(nd_desc);
433 nvdimm_bus_unlock(dev);
434
435 if (cap < NVDIMM_FWA_CAP_QUIESCE)
436 return -EOPNOTSUPP;
437
438 switch (state) {
439 case NVDIMM_FWA_IDLE:
440 return sprintf(buf, "idle\n");
441 case NVDIMM_FWA_BUSY:
442 return sprintf(buf, "busy\n");
443 case NVDIMM_FWA_ARMED:
444 return sprintf(buf, "armed\n");
445 case NVDIMM_FWA_ARM_OVERFLOW:
446 return sprintf(buf, "overflow\n");
447 default:
448 return -ENXIO;
449 }
450 }
451
exec_firmware_activate(void * data)452 static int exec_firmware_activate(void *data)
453 {
454 struct nvdimm_bus_descriptor *nd_desc = data;
455
456 return nd_desc->fw_ops->activate(nd_desc);
457 }
458
activate_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)459 static ssize_t activate_store(struct device *dev,
460 struct device_attribute *attr, const char *buf, size_t len)
461 {
462 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
463 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
464 enum nvdimm_fwa_state state;
465 bool quiesce;
466 ssize_t rc;
467
468 if (!nd_desc->fw_ops)
469 return -EOPNOTSUPP;
470
471 if (sysfs_streq(buf, "live"))
472 quiesce = false;
473 else if (sysfs_streq(buf, "quiesce"))
474 quiesce = true;
475 else
476 return -EINVAL;
477
478 nvdimm_bus_lock(dev);
479 state = nd_desc->fw_ops->activate_state(nd_desc);
480
481 switch (state) {
482 case NVDIMM_FWA_BUSY:
483 rc = -EBUSY;
484 break;
485 case NVDIMM_FWA_ARMED:
486 case NVDIMM_FWA_ARM_OVERFLOW:
487 if (quiesce)
488 rc = hibernate_quiet_exec(exec_firmware_activate, nd_desc);
489 else
490 rc = nd_desc->fw_ops->activate(nd_desc);
491 break;
492 case NVDIMM_FWA_IDLE:
493 default:
494 rc = -ENXIO;
495 }
496 nvdimm_bus_unlock(dev);
497
498 if (rc == 0)
499 rc = len;
500 return rc;
501 }
502
503 static DEVICE_ATTR_ADMIN_RW(activate);
504
nvdimm_bus_firmware_visible(struct kobject * kobj,struct attribute * a,int n)505 static umode_t nvdimm_bus_firmware_visible(struct kobject *kobj, struct attribute *a, int n)
506 {
507 struct device *dev = container_of(kobj, typeof(*dev), kobj);
508 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
509 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
510 enum nvdimm_fwa_capability cap;
511
512 /*
513 * Both 'activate' and 'capability' disappear when no ops
514 * detected, or a negative capability is indicated.
515 */
516 if (!nd_desc->fw_ops)
517 return 0;
518
519 nvdimm_bus_lock(dev);
520 cap = nd_desc->fw_ops->capability(nd_desc);
521 nvdimm_bus_unlock(dev);
522
523 if (cap < NVDIMM_FWA_CAP_QUIESCE)
524 return 0;
525
526 return a->mode;
527 }
528 static struct attribute *nvdimm_bus_firmware_attributes[] = {
529 &dev_attr_activate.attr,
530 &dev_attr_capability.attr,
531 NULL,
532 };
533
534 static const struct attribute_group nvdimm_bus_firmware_attribute_group = {
535 .name = "firmware",
536 .attrs = nvdimm_bus_firmware_attributes,
537 .is_visible = nvdimm_bus_firmware_visible,
538 };
539
540 const struct attribute_group *nvdimm_bus_attribute_groups[] = {
541 &nvdimm_bus_attribute_group,
542 &nvdimm_bus_firmware_attribute_group,
543 NULL,
544 };
545
nvdimm_bus_add_badrange(struct nvdimm_bus * nvdimm_bus,u64 addr,u64 length)546 int nvdimm_bus_add_badrange(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length)
547 {
548 return badrange_add(&nvdimm_bus->badrange, addr, length);
549 }
550 EXPORT_SYMBOL_GPL(nvdimm_bus_add_badrange);
551
552 #ifdef CONFIG_BLK_DEV_INTEGRITY
nd_integrity_init(struct gendisk * disk,unsigned long meta_size)553 int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
554 {
555 struct blk_integrity bi;
556
557 if (meta_size == 0)
558 return 0;
559
560 memset(&bi, 0, sizeof(bi));
561
562 bi.tuple_size = meta_size;
563 bi.tag_size = meta_size;
564
565 blk_integrity_register(disk, &bi);
566 blk_queue_max_integrity_segments(disk->queue, 1);
567
568 return 0;
569 }
570 EXPORT_SYMBOL(nd_integrity_init);
571
572 #else /* CONFIG_BLK_DEV_INTEGRITY */
nd_integrity_init(struct gendisk * disk,unsigned long meta_size)573 int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
574 {
575 return 0;
576 }
577 EXPORT_SYMBOL(nd_integrity_init);
578
579 #endif
580
libnvdimm_init(void)581 static __init int libnvdimm_init(void)
582 {
583 int rc;
584
585 rc = nvdimm_bus_init();
586 if (rc)
587 return rc;
588 rc = nvdimm_init();
589 if (rc)
590 goto err_dimm;
591 rc = nd_region_init();
592 if (rc)
593 goto err_region;
594
595 nd_label_init();
596
597 return 0;
598 err_region:
599 nvdimm_exit();
600 err_dimm:
601 nvdimm_bus_exit();
602 return rc;
603 }
604
libnvdimm_exit(void)605 static __exit void libnvdimm_exit(void)
606 {
607 WARN_ON(!list_empty(&nvdimm_bus_list));
608 nd_region_exit();
609 nvdimm_exit();
610 nvdimm_bus_exit();
611 nvdimm_devs_exit();
612 }
613
614 MODULE_LICENSE("GPL v2");
615 MODULE_AUTHOR("Intel Corporation");
616 subsys_initcall(libnvdimm_init);
617 module_exit(libnvdimm_exit);
618
