2 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
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.
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.
13 #include <linux/libnvdimm.h>
14 #include <linux/export.h>
15 #include <linux/module.h>
16 #include <linux/blkdev.h>
17 #include <linux/device.h>
18 #include <linux/ctype.h>
19 #include <linux/ndctl.h>
20 #include <linux/mutex.h>
21 #include <linux/slab.h>
25 LIST_HEAD(nvdimm_bus_list);
26 DEFINE_MUTEX(nvdimm_bus_list_mutex);
27 static DEFINE_IDA(nd_ida);
29 void nvdimm_bus_lock(struct device *dev)
31 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
35 mutex_lock(&nvdimm_bus->reconfig_mutex);
37 EXPORT_SYMBOL(nvdimm_bus_lock);
39 void nvdimm_bus_unlock(struct device *dev)
41 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
45 mutex_unlock(&nvdimm_bus->reconfig_mutex);
47 EXPORT_SYMBOL(nvdimm_bus_unlock);
49 bool is_nvdimm_bus_locked(struct device *dev)
51 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
55 return mutex_is_locked(&nvdimm_bus->reconfig_mutex);
57 EXPORT_SYMBOL(is_nvdimm_bus_locked);
59 u64 nd_fletcher64(void *addr, size_t len, bool le)
66 for (i = 0; i < len / sizeof(u32); i++) {
67 lo32 += le ? le32_to_cpu((__le32) buf[i]) : buf[i];
71 return hi32 << 32 | lo32;
73 EXPORT_SYMBOL_GPL(nd_fletcher64);
75 static void nvdimm_bus_release(struct device *dev)
77 struct nvdimm_bus *nvdimm_bus;
79 nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
80 ida_simple_remove(&nd_ida, nvdimm_bus->id);
84 struct nvdimm_bus *to_nvdimm_bus(struct device *dev)
86 struct nvdimm_bus *nvdimm_bus;
88 nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
89 WARN_ON(nvdimm_bus->dev.release != nvdimm_bus_release);
92 EXPORT_SYMBOL_GPL(to_nvdimm_bus);
94 struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus)
96 /* struct nvdimm_bus definition is private to libnvdimm */
97 return nvdimm_bus->nd_desc;
99 EXPORT_SYMBOL_GPL(to_nd_desc);
101 struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev)
105 for (dev = nd_dev; dev; dev = dev->parent)
106 if (dev->release == nvdimm_bus_release)
108 dev_WARN_ONCE(nd_dev, !dev, "invalid dev, not on nd bus\n");
110 return to_nvdimm_bus(dev);
114 static bool is_uuid_sep(char sep)
116 if (sep == '\n' || sep == '-' || sep == ':' || sep == '\0')
121 static int nd_uuid_parse(struct device *dev, u8 *uuid_out, const char *buf,
124 const char *str = buf;
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]);
136 uuid[i] = (hex_to_bin(str[0]) << 4) | hex_to_bin(str[1]);
138 if (is_uuid_sep(*str))
142 memcpy(uuid_out, uuid, sizeof(uuid));
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
152 * Enforce that uuids can only be changed while the device is disabled
154 * LOCKING: expects device_lock() is held on entry
156 int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
165 rc = nd_uuid_parse(dev, uuid, buf, len);
170 *uuid_out = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
177 ssize_t nd_sector_size_show(unsigned long current_lbasize,
178 const unsigned long *supported, char *buf)
183 for (i = 0; supported[i]; i++)
184 if (current_lbasize == supported[i])
185 len += sprintf(buf + len, "[%ld] ", supported[i]);
187 len += sprintf(buf + len, "%ld ", supported[i]);
188 len += sprintf(buf + len, "\n");
192 ssize_t nd_sector_size_store(struct device *dev, const char *buf,
193 unsigned long *current_lbasize, const unsigned long *supported)
195 unsigned long lbasize;
201 rc = kstrtoul(buf, 0, &lbasize);
205 for (i = 0; supported[i]; i++)
206 if (lbasize == supported[i])
210 *current_lbasize = lbasize;
217 void __nd_iostat_start(struct bio *bio, unsigned long *start)
219 struct gendisk *disk = bio->bi_bdev->bd_disk;
220 const int rw = bio_data_dir(bio);
221 int cpu = part_stat_lock();
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);
230 EXPORT_SYMBOL(__nd_iostat_start);
232 void nd_iostat_end(struct bio *bio, unsigned long start)
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();
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);
244 EXPORT_SYMBOL(nd_iostat_end);
246 static ssize_t commands_show(struct device *dev,
247 struct device_attribute *attr, char *buf)
250 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
251 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
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");
258 static DEVICE_ATTR_RO(commands);
260 static const char *nvdimm_bus_provider(struct nvdimm_bus *nvdimm_bus)
262 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
263 struct device *parent = nvdimm_bus->dev.parent;
265 if (nd_desc->provider_name)
266 return nd_desc->provider_name;
268 return dev_name(parent);
273 static ssize_t provider_show(struct device *dev,
274 struct device_attribute *attr, char *buf)
276 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
278 return sprintf(buf, "%s\n", nvdimm_bus_provider(nvdimm_bus));
280 static DEVICE_ATTR_RO(provider);
282 static int flush_namespaces(struct device *dev, void *data)
289 static int flush_regions_dimms(struct device *dev, void *data)
293 device_for_each_child(dev, NULL, flush_namespaces);
297 static ssize_t wait_probe_show(struct device *dev,
298 struct device_attribute *attr, char *buf)
301 device_for_each_child(dev, NULL, flush_regions_dimms);
302 return sprintf(buf, "1\n");
304 static DEVICE_ATTR_RO(wait_probe);
306 static struct attribute *nvdimm_bus_attributes[] = {
307 &dev_attr_commands.attr,
308 &dev_attr_wait_probe.attr,
309 &dev_attr_provider.attr,
313 struct attribute_group nvdimm_bus_attribute_group = {
314 .attrs = nvdimm_bus_attributes,
316 EXPORT_SYMBOL_GPL(nvdimm_bus_attribute_group);
318 struct nvdimm_bus *__nvdimm_bus_register(struct device *parent,
319 struct nvdimm_bus_descriptor *nd_desc, struct module *module)
321 struct nvdimm_bus *nvdimm_bus;
324 nvdimm_bus = kzalloc(sizeof(*nvdimm_bus), GFP_KERNEL);
327 INIT_LIST_HEAD(&nvdimm_bus->list);
328 INIT_LIST_HEAD(&nvdimm_bus->poison_list);
329 init_waitqueue_head(&nvdimm_bus->probe_wait);
330 nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
331 mutex_init(&nvdimm_bus->reconfig_mutex);
332 if (nvdimm_bus->id < 0) {
336 nvdimm_bus->nd_desc = nd_desc;
337 nvdimm_bus->module = module;
338 nvdimm_bus->dev.parent = parent;
339 nvdimm_bus->dev.release = nvdimm_bus_release;
340 nvdimm_bus->dev.groups = nd_desc->attr_groups;
341 dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id);
342 rc = device_register(&nvdimm_bus->dev);
344 dev_dbg(&nvdimm_bus->dev, "registration failed: %d\n", rc);
348 rc = nvdimm_bus_create_ndctl(nvdimm_bus);
352 mutex_lock(&nvdimm_bus_list_mutex);
353 list_add_tail(&nvdimm_bus->list, &nvdimm_bus_list);
354 mutex_unlock(&nvdimm_bus_list_mutex);
358 put_device(&nvdimm_bus->dev);
361 EXPORT_SYMBOL_GPL(__nvdimm_bus_register);
363 static void set_badblock(struct gendisk *disk, sector_t s, int num)
365 struct device *dev = disk->driverfs_dev;
367 dev_dbg(dev, "Found a poison range (0x%llx, 0x%llx)\n",
368 (u64) s * 512, (u64) num * 512);
369 /* this isn't an error as the hardware will still throw an exception */
370 if (disk_set_badblocks(disk, s, num))
371 dev_info_once(dev, "%s: failed for sector %llx\n",
376 * __add_badblock_range() - Convert a physical address range to bad sectors
377 * @disk: the disk associated with the namespace
378 * @ns_offset: namespace offset where the error range begins (in bytes)
379 * @len: number of bytes of poison to be added
381 * This assumes that the range provided with (ns_offset, len) is within
382 * the bounds of physical addresses for this namespace, i.e. lies in the
383 * interval [ns_start, ns_start + ns_size)
385 static int __add_badblock_range(struct gendisk *disk, u64 ns_offset, u64 len)
387 unsigned int sector_size = queue_logical_block_size(disk->queue);
388 sector_t start_sector;
393 start_sector = div_u64(ns_offset, sector_size);
394 num_sectors = div_u64_rem(len, sector_size, &rem);
399 rc = disk_alloc_badblocks(disk);
404 if (unlikely(num_sectors > (u64)INT_MAX)) {
405 u64 remaining = num_sectors;
406 sector_t s = start_sector;
409 int done = min_t(u64, remaining, INT_MAX);
411 set_badblock(disk, s, done);
416 set_badblock(disk, start_sector, num_sectors);
422 * nvdimm_namespace_add_poison() - Convert a list of poison ranges to badblocks
423 * @disk: the gendisk associated with the namespace where badblocks
425 * @offset: offset at the start of the namespace before 'sector 0'
426 * @ndns: the namespace containing poison ranges
428 * The poison list generated during NFIT initialization may contain multiple,
429 * possibly overlapping ranges in the SPA (System Physical Address) space.
430 * Compare each of these ranges to the namespace currently being initialized,
431 * and add badblocks to the gendisk for all matching sub-ranges
436 int nvdimm_namespace_add_poison(struct gendisk *disk, resource_size_t offset,
437 struct nd_namespace_common *ndns)
439 struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
440 struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
441 struct nvdimm_bus *nvdimm_bus;
442 struct list_head *poison_list;
443 u64 ns_start, ns_end, ns_size;
444 struct nd_poison *pl;
447 ns_size = nvdimm_namespace_capacity(ndns) - offset;
448 ns_start = nsio->res.start + offset;
449 ns_end = nsio->res.end;
451 nvdimm_bus = to_nvdimm_bus(nd_region->dev.parent);
452 poison_list = &nvdimm_bus->poison_list;
453 if (list_empty(poison_list))
456 list_for_each_entry(pl, poison_list, list) {
457 u64 pl_end = pl->start + pl->length - 1;
459 /* Discard intervals with no intersection */
460 if (pl_end < ns_start)
462 if (pl->start > ns_end)
464 /* Deal with any overlap after start of the namespace */
465 if (pl->start >= ns_start) {
466 u64 start = pl->start;
469 if (pl_end <= ns_end)
472 len = ns_start + ns_size - pl->start;
474 rc = __add_badblock_range(disk, start - ns_start, len);
479 /* Deal with overlap for poison starting before the namespace */
480 if (pl->start < ns_start) {
484 len = pl->start + pl->length - ns_start;
488 rc = __add_badblock_range(disk, 0, len);
496 EXPORT_SYMBOL_GPL(nvdimm_namespace_add_poison);
498 static int __add_poison(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length)
500 struct nd_poison *pl;
502 pl = kzalloc(sizeof(*pl), GFP_KERNEL);
508 list_add_tail(&pl->list, &nvdimm_bus->poison_list);
513 int nvdimm_bus_add_poison(struct nvdimm_bus *nvdimm_bus, u64 addr, u64 length)
515 struct nd_poison *pl;
517 if (list_empty(&nvdimm_bus->poison_list))
518 return __add_poison(nvdimm_bus, addr, length);
521 * There is a chance this is a duplicate, check for those first.
522 * This will be the common case as ARS_STATUS returns all known
523 * errors in the SPA space, and we can't query it per region
525 list_for_each_entry(pl, &nvdimm_bus->poison_list, list)
526 if (pl->start == addr) {
527 /* If length has changed, update this list entry */
528 if (pl->length != length)
534 * If not a duplicate or a simple length update, add the entry as is,
535 * as any overlapping ranges will get resolved when the list is consumed
536 * and converted to badblocks
538 return __add_poison(nvdimm_bus, addr, length);
540 EXPORT_SYMBOL_GPL(nvdimm_bus_add_poison);
542 static void free_poison_list(struct list_head *poison_list)
544 struct nd_poison *pl, *next;
546 list_for_each_entry_safe(pl, next, poison_list, list) {
550 list_del_init(poison_list);
553 static int child_unregister(struct device *dev, void *data)
556 * the singular ndctl class device per bus needs to be
557 * "device_destroy"ed, so skip it here
559 * i.e. remove classless children
564 nd_device_unregister(dev, ND_SYNC);
568 void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)
573 mutex_lock(&nvdimm_bus_list_mutex);
574 list_del_init(&nvdimm_bus->list);
575 mutex_unlock(&nvdimm_bus_list_mutex);
578 device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister);
579 free_poison_list(&nvdimm_bus->poison_list);
580 nvdimm_bus_destroy_ndctl(nvdimm_bus);
582 device_unregister(&nvdimm_bus->dev);
584 EXPORT_SYMBOL_GPL(nvdimm_bus_unregister);
586 #ifdef CONFIG_BLK_DEV_INTEGRITY
587 int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
589 struct blk_integrity bi;
595 bi.tuple_size = meta_size;
596 bi.tag_size = meta_size;
598 blk_integrity_register(disk, &bi);
599 blk_queue_max_integrity_segments(disk->queue, 1);
603 EXPORT_SYMBOL(nd_integrity_init);
605 #else /* CONFIG_BLK_DEV_INTEGRITY */
606 int nd_integrity_init(struct gendisk *disk, unsigned long meta_size)
610 EXPORT_SYMBOL(nd_integrity_init);
614 static __init int libnvdimm_init(void)
618 rc = nvdimm_bus_init();
624 rc = nd_region_init();
635 static __exit void libnvdimm_exit(void)
637 WARN_ON(!list_empty(&nvdimm_bus_list));
643 MODULE_LICENSE("GPL v2");
644 MODULE_AUTHOR("Intel Corporation");
645 subsys_initcall(libnvdimm_init);
646 module_exit(libnvdimm_exit);