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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
4 */
5#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
6#include <linux/libnvdimm.h>
7#include <linux/sched/mm.h>
8#include <linux/vmalloc.h>
9#include <linux/uaccess.h>
10#include <linux/module.h>
11#include <linux/blkdev.h>
12#include <linux/fcntl.h>
13#include <linux/async.h>
14#include <linux/genhd.h>
15#include <linux/ndctl.h>
16#include <linux/sched.h>
17#include <linux/slab.h>
18#include <linux/cpu.h>
19#include <linux/fs.h>
20#include <linux/io.h>
21#include <linux/mm.h>
22#include <linux/nd.h>
23#include "nd-core.h"
24#include "nd.h"
25#include "pfn.h"
26
27int nvdimm_major;
28static int nvdimm_bus_major;
29struct class *nd_class;
30static DEFINE_IDA(nd_ida);
31
32static int to_nd_device_type(struct device *dev)
33{
34 if (is_nvdimm(dev))
35 return ND_DEVICE_DIMM;
36 else if (is_memory(dev))
37 return ND_DEVICE_REGION_PMEM;
38 else if (is_nd_blk(dev))
39 return ND_DEVICE_REGION_BLK;
40 else if (is_nd_dax(dev))
41 return ND_DEVICE_DAX_PMEM;
42 else if (is_nd_region(dev->parent))
43 return nd_region_to_nstype(to_nd_region(dev->parent));
44
45 return 0;
46}
47
48static int nvdimm_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
49{
50 return add_uevent_var(env, "MODALIAS=" ND_DEVICE_MODALIAS_FMT,
51 to_nd_device_type(dev));
52}
53
54static struct module *to_bus_provider(struct device *dev)
55{
56 /* pin bus providers while regions are enabled */
57 if (is_nd_region(dev)) {
58 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
59
60 return nvdimm_bus->nd_desc->module;
61 }
62 return NULL;
63}
64
65static void nvdimm_bus_probe_start(struct nvdimm_bus *nvdimm_bus)
66{
67 nvdimm_bus_lock(&nvdimm_bus->dev);
68 nvdimm_bus->probe_active++;
69 nvdimm_bus_unlock(&nvdimm_bus->dev);
70}
71
72static void nvdimm_bus_probe_end(struct nvdimm_bus *nvdimm_bus)
73{
74 nvdimm_bus_lock(&nvdimm_bus->dev);
75 if (--nvdimm_bus->probe_active == 0)
76 wake_up(&nvdimm_bus->wait);
77 nvdimm_bus_unlock(&nvdimm_bus->dev);
78}
79
80static int nvdimm_bus_probe(struct device *dev)
81{
82 struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
83 struct module *provider = to_bus_provider(dev);
84 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
85 int rc;
86
87 if (!try_module_get(provider))
88 return -ENXIO;
89
90 dev_dbg(&nvdimm_bus->dev, "START: %s.probe(%s)\n",
91 dev->driver->name, dev_name(dev));
92
93 nvdimm_bus_probe_start(nvdimm_bus);
94 debug_nvdimm_lock(dev);
95 rc = nd_drv->probe(dev);
96 debug_nvdimm_unlock(dev);
97
98 if ((rc == 0 || rc == -EOPNOTSUPP) &&
99 dev->parent && is_nd_region(dev->parent))
100 nd_region_advance_seeds(to_nd_region(dev->parent), dev);
101 nvdimm_bus_probe_end(nvdimm_bus);
102
103 dev_dbg(&nvdimm_bus->dev, "END: %s.probe(%s) = %d\n", dev->driver->name,
104 dev_name(dev), rc);
105
106 if (rc != 0)
107 module_put(provider);
108 return rc;
109}
110
111static int nvdimm_bus_remove(struct device *dev)
112{
113 struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
114 struct module *provider = to_bus_provider(dev);
115 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
116 int rc = 0;
117
118 if (nd_drv->remove) {
119 debug_nvdimm_lock(dev);
120 rc = nd_drv->remove(dev);
121 debug_nvdimm_unlock(dev);
122 }
123
124 dev_dbg(&nvdimm_bus->dev, "%s.remove(%s) = %d\n", dev->driver->name,
125 dev_name(dev), rc);
126 module_put(provider);
127 return rc;
128}
129
130static void nvdimm_bus_shutdown(struct device *dev)
131{
132 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
133 struct nd_device_driver *nd_drv = NULL;
134
135 if (dev->driver)
136 nd_drv = to_nd_device_driver(dev->driver);
137
138 if (nd_drv && nd_drv->shutdown) {
139 nd_drv->shutdown(dev);
140 dev_dbg(&nvdimm_bus->dev, "%s.shutdown(%s)\n",
141 dev->driver->name, dev_name(dev));
142 }
143}
144
145void nd_device_notify(struct device *dev, enum nvdimm_event event)
146{
147 nd_device_lock(dev);
148 if (dev->driver) {
149 struct nd_device_driver *nd_drv;
150
151 nd_drv = to_nd_device_driver(dev->driver);
152 if (nd_drv->notify)
153 nd_drv->notify(dev, event);
154 }
155 nd_device_unlock(dev);
156}
157EXPORT_SYMBOL(nd_device_notify);
158
159void nvdimm_region_notify(struct nd_region *nd_region, enum nvdimm_event event)
160{
161 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
162
163 if (!nvdimm_bus)
164 return;
165
166 /* caller is responsible for holding a reference on the device */
167 nd_device_notify(&nd_region->dev, event);
168}
169EXPORT_SYMBOL_GPL(nvdimm_region_notify);
170
171struct clear_badblocks_context {
172 resource_size_t phys, cleared;
173};
174
175static int nvdimm_clear_badblocks_region(struct device *dev, void *data)
176{
177 struct clear_badblocks_context *ctx = data;
178 struct nd_region *nd_region;
179 resource_size_t ndr_end;
180 sector_t sector;
181
182 /* make sure device is a region */
183 if (!is_memory(dev))
184 return 0;
185
186 nd_region = to_nd_region(dev);
187 ndr_end = nd_region->ndr_start + nd_region->ndr_size - 1;
188
189 /* make sure we are in the region */
190 if (ctx->phys < nd_region->ndr_start
191 || (ctx->phys + ctx->cleared) > ndr_end)
192 return 0;
193
194 sector = (ctx->phys - nd_region->ndr_start) / 512;
195 badblocks_clear(&nd_region->bb, sector, ctx->cleared / 512);
196
197 if (nd_region->bb_state)
198 sysfs_notify_dirent(nd_region->bb_state);
199
200 return 0;
201}
202
203static void nvdimm_clear_badblocks_regions(struct nvdimm_bus *nvdimm_bus,
204 phys_addr_t phys, u64 cleared)
205{
206 struct clear_badblocks_context ctx = {
207 .phys = phys,
208 .cleared = cleared,
209 };
210
211 device_for_each_child(&nvdimm_bus->dev, &ctx,
212 nvdimm_clear_badblocks_region);
213}
214
215static void nvdimm_account_cleared_poison(struct nvdimm_bus *nvdimm_bus,
216 phys_addr_t phys, u64 cleared)
217{
218 if (cleared > 0)
219 badrange_forget(&nvdimm_bus->badrange, phys, cleared);
220
221 if (cleared > 0 && cleared / 512)
222 nvdimm_clear_badblocks_regions(nvdimm_bus, phys, cleared);
223}
224
225long nvdimm_clear_poison(struct device *dev, phys_addr_t phys,
226 unsigned int len)
227{
228 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
229 struct nvdimm_bus_descriptor *nd_desc;
230 struct nd_cmd_clear_error clear_err;
231 struct nd_cmd_ars_cap ars_cap;
232 u32 clear_err_unit, mask;
233 unsigned int noio_flag;
234 int cmd_rc, rc;
235
236 if (!nvdimm_bus)
237 return -ENXIO;
238
239 nd_desc = nvdimm_bus->nd_desc;
240 /*
241 * if ndctl does not exist, it's PMEM_LEGACY and
242 * we want to just pretend everything is handled.
243 */
244 if (!nd_desc->ndctl)
245 return len;
246
247 memset(&ars_cap, 0, sizeof(ars_cap));
248 ars_cap.address = phys;
249 ars_cap.length = len;
250 noio_flag = memalloc_noio_save();
251 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, &ars_cap,
252 sizeof(ars_cap), &cmd_rc);
253 memalloc_noio_restore(noio_flag);
254 if (rc < 0)
255 return rc;
256 if (cmd_rc < 0)
257 return cmd_rc;
258 clear_err_unit = ars_cap.clear_err_unit;
259 if (!clear_err_unit || !is_power_of_2(clear_err_unit))
260 return -ENXIO;
261
262 mask = clear_err_unit - 1;
263 if ((phys | len) & mask)
264 return -ENXIO;
265 memset(&clear_err, 0, sizeof(clear_err));
266 clear_err.address = phys;
267 clear_err.length = len;
268 noio_flag = memalloc_noio_save();
269 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_CLEAR_ERROR, &clear_err,
270 sizeof(clear_err), &cmd_rc);
271 memalloc_noio_restore(noio_flag);
272 if (rc < 0)
273 return rc;
274 if (cmd_rc < 0)
275 return cmd_rc;
276
277 nvdimm_account_cleared_poison(nvdimm_bus, phys, clear_err.cleared);
278
279 return clear_err.cleared;
280}
281EXPORT_SYMBOL_GPL(nvdimm_clear_poison);
282
283static int nvdimm_bus_match(struct device *dev, struct device_driver *drv);
284
285static struct bus_type nvdimm_bus_type = {
286 .name = "nd",
287 .uevent = nvdimm_bus_uevent,
288 .match = nvdimm_bus_match,
289 .probe = nvdimm_bus_probe,
290 .remove = nvdimm_bus_remove,
291 .shutdown = nvdimm_bus_shutdown,
292};
293
294static void nvdimm_bus_release(struct device *dev)
295{
296 struct nvdimm_bus *nvdimm_bus;
297
298 nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
299 ida_simple_remove(&nd_ida, nvdimm_bus->id);
300 kfree(nvdimm_bus);
301}
302
303static const struct device_type nvdimm_bus_dev_type = {
304 .release = nvdimm_bus_release,
305 .groups = nvdimm_bus_attribute_groups,
306};
307
308bool is_nvdimm_bus(struct device *dev)
309{
310 return dev->type == &nvdimm_bus_dev_type;
311}
312
313struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev)
314{
315 struct device *dev;
316
317 for (dev = nd_dev; dev; dev = dev->parent)
318 if (is_nvdimm_bus(dev))
319 break;
320 dev_WARN_ONCE(nd_dev, !dev, "invalid dev, not on nd bus\n");
321 if (dev)
322 return to_nvdimm_bus(dev);
323 return NULL;
324}
325
326struct nvdimm_bus *to_nvdimm_bus(struct device *dev)
327{
328 struct nvdimm_bus *nvdimm_bus;
329
330 nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
331 WARN_ON(!is_nvdimm_bus(dev));
332 return nvdimm_bus;
333}
334EXPORT_SYMBOL_GPL(to_nvdimm_bus);
335
336struct nvdimm_bus *nvdimm_to_bus(struct nvdimm *nvdimm)
337{
338 return to_nvdimm_bus(nvdimm->dev.parent);
339}
340EXPORT_SYMBOL_GPL(nvdimm_to_bus);
341
342struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
343 struct nvdimm_bus_descriptor *nd_desc)
344{
345 struct nvdimm_bus *nvdimm_bus;
346 int rc;
347
348 nvdimm_bus = kzalloc(sizeof(*nvdimm_bus), GFP_KERNEL);
349 if (!nvdimm_bus)
350 return NULL;
351 INIT_LIST_HEAD(&nvdimm_bus->list);
352 INIT_LIST_HEAD(&nvdimm_bus->mapping_list);
353 init_waitqueue_head(&nvdimm_bus->wait);
354 nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
355 if (nvdimm_bus->id < 0) {
356 kfree(nvdimm_bus);
357 return NULL;
358 }
359 mutex_init(&nvdimm_bus->reconfig_mutex);
360 badrange_init(&nvdimm_bus->badrange);
361 nvdimm_bus->nd_desc = nd_desc;
362 nvdimm_bus->dev.parent = parent;
363 nvdimm_bus->dev.type = &nvdimm_bus_dev_type;
364 nvdimm_bus->dev.groups = nd_desc->attr_groups;
365 nvdimm_bus->dev.bus = &nvdimm_bus_type;
366 nvdimm_bus->dev.of_node = nd_desc->of_node;
367 dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id);
368 rc = device_register(&nvdimm_bus->dev);
369 if (rc) {
370 dev_dbg(&nvdimm_bus->dev, "registration failed: %d\n", rc);
371 goto err;
372 }
373
374 return nvdimm_bus;
375 err:
376 put_device(&nvdimm_bus->dev);
377 return NULL;
378}
379EXPORT_SYMBOL_GPL(nvdimm_bus_register);
380
381void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)
382{
383 if (!nvdimm_bus)
384 return;
385 device_unregister(&nvdimm_bus->dev);
386}
387EXPORT_SYMBOL_GPL(nvdimm_bus_unregister);
388
389static int child_unregister(struct device *dev, void *data)
390{
391 /*
392 * the singular ndctl class device per bus needs to be
393 * "device_destroy"ed, so skip it here
394 *
395 * i.e. remove classless children
396 */
397 if (dev->class)
398 return 0;
399
400 if (is_nvdimm(dev)) {
401 struct nvdimm *nvdimm = to_nvdimm(dev);
402 bool dev_put = false;
403
404 /* We are shutting down. Make state frozen artificially. */
405 nvdimm_bus_lock(dev);
406 set_bit(NVDIMM_SECURITY_FROZEN, &nvdimm->sec.flags);
407 if (test_and_clear_bit(NDD_WORK_PENDING, &nvdimm->flags))
408 dev_put = true;
409 nvdimm_bus_unlock(dev);
410 cancel_delayed_work_sync(&nvdimm->dwork);
411 if (dev_put)
412 put_device(dev);
413 }
414 nd_device_unregister(dev, ND_SYNC);
415
416 return 0;
417}
418
419static void free_badrange_list(struct list_head *badrange_list)
420{
421 struct badrange_entry *bre, *next;
422
423 list_for_each_entry_safe(bre, next, badrange_list, list) {
424 list_del(&bre->list);
425 kfree(bre);
426 }
427 list_del_init(badrange_list);
428}
429
430static int nd_bus_remove(struct device *dev)
431{
432 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
433
434 mutex_lock(&nvdimm_bus_list_mutex);
435 list_del_init(&nvdimm_bus->list);
436 mutex_unlock(&nvdimm_bus_list_mutex);
437
438 wait_event(nvdimm_bus->wait,
439 atomic_read(&nvdimm_bus->ioctl_active) == 0);
440
441 nd_synchronize();
442 device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister);
443
444 spin_lock(&nvdimm_bus->badrange.lock);
445 free_badrange_list(&nvdimm_bus->badrange.list);
446 spin_unlock(&nvdimm_bus->badrange.lock);
447
448 nvdimm_bus_destroy_ndctl(nvdimm_bus);
449
450 return 0;
451}
452
453static int nd_bus_probe(struct device *dev)
454{
455 struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
456 int rc;
457
458 rc = nvdimm_bus_create_ndctl(nvdimm_bus);
459 if (rc)
460 return rc;
461
462 mutex_lock(&nvdimm_bus_list_mutex);
463 list_add_tail(&nvdimm_bus->list, &nvdimm_bus_list);
464 mutex_unlock(&nvdimm_bus_list_mutex);
465
466 /* enable bus provider attributes to look up their local context */
467 dev_set_drvdata(dev, nvdimm_bus->nd_desc);
468
469 return 0;
470}
471
472static struct nd_device_driver nd_bus_driver = {
473 .probe = nd_bus_probe,
474 .remove = nd_bus_remove,
475 .drv = {
476 .name = "nd_bus",
477 .suppress_bind_attrs = true,
478 .bus = &nvdimm_bus_type,
479 .owner = THIS_MODULE,
480 .mod_name = KBUILD_MODNAME,
481 },
482};
483
484static int nvdimm_bus_match(struct device *dev, struct device_driver *drv)
485{
486 struct nd_device_driver *nd_drv = to_nd_device_driver(drv);
487
488 if (is_nvdimm_bus(dev) && nd_drv == &nd_bus_driver)
489 return true;
490
491 return !!test_bit(to_nd_device_type(dev), &nd_drv->type);
492}
493
494static ASYNC_DOMAIN_EXCLUSIVE(nd_async_domain);
495
496void nd_synchronize(void)
497{
498 async_synchronize_full_domain(&nd_async_domain);
499}
500EXPORT_SYMBOL_GPL(nd_synchronize);
501
502static void nd_async_device_register(void *d, async_cookie_t cookie)
503{
504 struct device *dev = d;
505
506 if (device_add(dev) != 0) {
507 dev_err(dev, "%s: failed\n", __func__);
508 put_device(dev);
509 }
510 put_device(dev);
511 if (dev->parent)
512 put_device(dev->parent);
513}
514
515static void nd_async_device_unregister(void *d, async_cookie_t cookie)
516{
517 struct device *dev = d;
518
519 /* flush bus operations before delete */
520 nvdimm_bus_lock(dev);
521 nvdimm_bus_unlock(dev);
522
523 device_unregister(dev);
524 put_device(dev);
525}
526
527void __nd_device_register(struct device *dev)
528{
529 if (!dev)
530 return;
531
532 /*
533 * Ensure that region devices always have their NUMA node set as
534 * early as possible. This way we are able to make certain that
535 * any memory associated with the creation and the creation
536 * itself of the region is associated with the correct node.
537 */
538 if (is_nd_region(dev))
539 set_dev_node(dev, to_nd_region(dev)->numa_node);
540
541 dev->bus = &nvdimm_bus_type;
542 if (dev->parent) {
543 get_device(dev->parent);
544 if (dev_to_node(dev) == NUMA_NO_NODE)
545 set_dev_node(dev, dev_to_node(dev->parent));
546 }
547 get_device(dev);
548
549 async_schedule_dev_domain(nd_async_device_register, dev,
550 &nd_async_domain);
551}
552
553void nd_device_register(struct device *dev)
554{
555 device_initialize(dev);
556 __nd_device_register(dev);
557}
558EXPORT_SYMBOL(nd_device_register);
559
560void nd_device_unregister(struct device *dev, enum nd_async_mode mode)
561{
562 bool killed;
563
564 switch (mode) {
565 case ND_ASYNC:
566 /*
567 * In the async case this is being triggered with the
568 * device lock held and the unregistration work needs to
569 * be moved out of line iff this is thread has won the
570 * race to schedule the deletion.
571 */
572 if (!kill_device(dev))
573 return;
574
575 get_device(dev);
576 async_schedule_domain(nd_async_device_unregister, dev,
577 &nd_async_domain);
578 break;
579 case ND_SYNC:
580 /*
581 * In the sync case the device is being unregistered due
582 * to a state change of the parent. Claim the kill state
583 * to synchronize against other unregistration requests,
584 * or otherwise let the async path handle it if the
585 * unregistration was already queued.
586 */
587 nd_device_lock(dev);
588 killed = kill_device(dev);
589 nd_device_unlock(dev);
590
591 if (!killed)
592 return;
593
594 nd_synchronize();
595 device_unregister(dev);
596 break;
597 }
598}
599EXPORT_SYMBOL(nd_device_unregister);
600
601/**
602 * __nd_driver_register() - register a region or a namespace driver
603 * @nd_drv: driver to register
604 * @owner: automatically set by nd_driver_register() macro
605 * @mod_name: automatically set by nd_driver_register() macro
606 */
607int __nd_driver_register(struct nd_device_driver *nd_drv, struct module *owner,
608 const char *mod_name)
609{
610 struct device_driver *drv = &nd_drv->drv;
611
612 if (!nd_drv->type) {
613 pr_debug("driver type bitmask not set (%ps)\n",
614 __builtin_return_address(0));
615 return -EINVAL;
616 }
617
618 if (!nd_drv->probe) {
619 pr_debug("%s ->probe() must be specified\n", mod_name);
620 return -EINVAL;
621 }
622
623 drv->bus = &nvdimm_bus_type;
624 drv->owner = owner;
625 drv->mod_name = mod_name;
626
627 return driver_register(drv);
628}
629EXPORT_SYMBOL(__nd_driver_register);
630
631int nvdimm_revalidate_disk(struct gendisk *disk)
632{
633 struct device *dev = disk_to_dev(disk)->parent;
634 struct nd_region *nd_region = to_nd_region(dev->parent);
635 int disk_ro = get_disk_ro(disk);
636
637 /*
638 * Upgrade to read-only if the region is read-only preserve as
639 * read-only if the disk is already read-only.
640 */
641 if (disk_ro || nd_region->ro == disk_ro)
642 return 0;
643
644 dev_info(dev, "%s read-only, marking %s read-only\n",
645 dev_name(&nd_region->dev), disk->disk_name);
646 set_disk_ro(disk, 1);
647
648 return 0;
649
650}
651EXPORT_SYMBOL(nvdimm_revalidate_disk);
652
653static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
654 char *buf)
655{
656 return sprintf(buf, ND_DEVICE_MODALIAS_FMT "\n",
657 to_nd_device_type(dev));
658}
659static DEVICE_ATTR_RO(modalias);
660
661static ssize_t devtype_show(struct device *dev, struct device_attribute *attr,
662 char *buf)
663{
664 return sprintf(buf, "%s\n", dev->type->name);
665}
666static DEVICE_ATTR_RO(devtype);
667
668static struct attribute *nd_device_attributes[] = {
669 &dev_attr_modalias.attr,
670 &dev_attr_devtype.attr,
671 NULL,
672};
673
674/*
675 * nd_device_attribute_group - generic attributes for all devices on an nd bus
676 */
677const struct attribute_group nd_device_attribute_group = {
678 .attrs = nd_device_attributes,
679};
680
681static ssize_t numa_node_show(struct device *dev,
682 struct device_attribute *attr, char *buf)
683{
684 return sprintf(buf, "%d\n", dev_to_node(dev));
685}
686static DEVICE_ATTR_RO(numa_node);
687
688static int nvdimm_dev_to_target_node(struct device *dev)
689{
690 struct device *parent = dev->parent;
691 struct nd_region *nd_region = NULL;
692
693 if (is_nd_region(dev))
694 nd_region = to_nd_region(dev);
695 else if (parent && is_nd_region(parent))
696 nd_region = to_nd_region(parent);
697
698 if (!nd_region)
699 return NUMA_NO_NODE;
700 return nd_region->target_node;
701}
702
703static ssize_t target_node_show(struct device *dev,
704 struct device_attribute *attr, char *buf)
705{
706 return sprintf(buf, "%d\n", nvdimm_dev_to_target_node(dev));
707}
708static DEVICE_ATTR_RO(target_node);
709
710static struct attribute *nd_numa_attributes[] = {
711 &dev_attr_numa_node.attr,
712 &dev_attr_target_node.attr,
713 NULL,
714};
715
716static umode_t nd_numa_attr_visible(struct kobject *kobj, struct attribute *a,
717 int n)
718{
719 struct device *dev = container_of(kobj, typeof(*dev), kobj);
720
721 if (!IS_ENABLED(CONFIG_NUMA))
722 return 0;
723
724 if (a == &dev_attr_target_node.attr &&
725 nvdimm_dev_to_target_node(dev) == NUMA_NO_NODE)
726 return 0;
727
728 return a->mode;
729}
730
731/*
732 * nd_numa_attribute_group - NUMA attributes for all devices on an nd bus
733 */
734const struct attribute_group nd_numa_attribute_group = {
735 .attrs = nd_numa_attributes,
736 .is_visible = nd_numa_attr_visible,
737};
738
739int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus)
740{
741 dev_t devt = MKDEV(nvdimm_bus_major, nvdimm_bus->id);
742 struct device *dev;
743
744 dev = device_create(nd_class, &nvdimm_bus->dev, devt, nvdimm_bus,
745 "ndctl%d", nvdimm_bus->id);
746
747 if (IS_ERR(dev))
748 dev_dbg(&nvdimm_bus->dev, "failed to register ndctl%d: %ld\n",
749 nvdimm_bus->id, PTR_ERR(dev));
750 return PTR_ERR_OR_ZERO(dev);
751}
752
753void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus)
754{
755 device_destroy(nd_class, MKDEV(nvdimm_bus_major, nvdimm_bus->id));
756}
757
758static const struct nd_cmd_desc __nd_cmd_dimm_descs[] = {
759 [ND_CMD_IMPLEMENTED] = { },
760 [ND_CMD_SMART] = {
761 .out_num = 2,
762 .out_sizes = { 4, 128, },
763 },
764 [ND_CMD_SMART_THRESHOLD] = {
765 .out_num = 2,
766 .out_sizes = { 4, 8, },
767 },
768 [ND_CMD_DIMM_FLAGS] = {
769 .out_num = 2,
770 .out_sizes = { 4, 4 },
771 },
772 [ND_CMD_GET_CONFIG_SIZE] = {
773 .out_num = 3,
774 .out_sizes = { 4, 4, 4, },
775 },
776 [ND_CMD_GET_CONFIG_DATA] = {
777 .in_num = 2,
778 .in_sizes = { 4, 4, },
779 .out_num = 2,
780 .out_sizes = { 4, UINT_MAX, },
781 },
782 [ND_CMD_SET_CONFIG_DATA] = {
783 .in_num = 3,
784 .in_sizes = { 4, 4, UINT_MAX, },
785 .out_num = 1,
786 .out_sizes = { 4, },
787 },
788 [ND_CMD_VENDOR] = {
789 .in_num = 3,
790 .in_sizes = { 4, 4, UINT_MAX, },
791 .out_num = 3,
792 .out_sizes = { 4, 4, UINT_MAX, },
793 },
794 [ND_CMD_CALL] = {
795 .in_num = 2,
796 .in_sizes = { sizeof(struct nd_cmd_pkg), UINT_MAX, },
797 .out_num = 1,
798 .out_sizes = { UINT_MAX, },
799 },
800};
801
802const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd)
803{
804 if (cmd < ARRAY_SIZE(__nd_cmd_dimm_descs))
805 return &__nd_cmd_dimm_descs[cmd];
806 return NULL;
807}
808EXPORT_SYMBOL_GPL(nd_cmd_dimm_desc);
809
810static const struct nd_cmd_desc __nd_cmd_bus_descs[] = {
811 [ND_CMD_IMPLEMENTED] = { },
812 [ND_CMD_ARS_CAP] = {
813 .in_num = 2,
814 .in_sizes = { 8, 8, },
815 .out_num = 4,
816 .out_sizes = { 4, 4, 4, 4, },
817 },
818 [ND_CMD_ARS_START] = {
819 .in_num = 5,
820 .in_sizes = { 8, 8, 2, 1, 5, },
821 .out_num = 2,
822 .out_sizes = { 4, 4, },
823 },
824 [ND_CMD_ARS_STATUS] = {
825 .out_num = 3,
826 .out_sizes = { 4, 4, UINT_MAX, },
827 },
828 [ND_CMD_CLEAR_ERROR] = {
829 .in_num = 2,
830 .in_sizes = { 8, 8, },
831 .out_num = 3,
832 .out_sizes = { 4, 4, 8, },
833 },
834 [ND_CMD_CALL] = {
835 .in_num = 2,
836 .in_sizes = { sizeof(struct nd_cmd_pkg), UINT_MAX, },
837 .out_num = 1,
838 .out_sizes = { UINT_MAX, },
839 },
840};
841
842const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd)
843{
844 if (cmd < ARRAY_SIZE(__nd_cmd_bus_descs))
845 return &__nd_cmd_bus_descs[cmd];
846 return NULL;
847}
848EXPORT_SYMBOL_GPL(nd_cmd_bus_desc);
849
850u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
851 const struct nd_cmd_desc *desc, int idx, void *buf)
852{
853 if (idx >= desc->in_num)
854 return UINT_MAX;
855
856 if (desc->in_sizes[idx] < UINT_MAX)
857 return desc->in_sizes[idx];
858
859 if (nvdimm && cmd == ND_CMD_SET_CONFIG_DATA && idx == 2) {
860 struct nd_cmd_set_config_hdr *hdr = buf;
861
862 return hdr->in_length;
863 } else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) {
864 struct nd_cmd_vendor_hdr *hdr = buf;
865
866 return hdr->in_length;
867 } else if (cmd == ND_CMD_CALL) {
868 struct nd_cmd_pkg *pkg = buf;
869
870 return pkg->nd_size_in;
871 }
872
873 return UINT_MAX;
874}
875EXPORT_SYMBOL_GPL(nd_cmd_in_size);
876
877u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
878 const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
879 const u32 *out_field, unsigned long remainder)
880{
881 if (idx >= desc->out_num)
882 return UINT_MAX;
883
884 if (desc->out_sizes[idx] < UINT_MAX)
885 return desc->out_sizes[idx];
886
887 if (nvdimm && cmd == ND_CMD_GET_CONFIG_DATA && idx == 1)
888 return in_field[1];
889 else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2)
890 return out_field[1];
891 else if (!nvdimm && cmd == ND_CMD_ARS_STATUS && idx == 2) {
892 /*
893 * Per table 9-276 ARS Data in ACPI 6.1, out_field[1] is
894 * "Size of Output Buffer in bytes, including this
895 * field."
896 */
897 if (out_field[1] < 4)
898 return 0;
899 /*
900 * ACPI 6.1 is ambiguous if 'status' is included in the
901 * output size. If we encounter an output size that
902 * overshoots the remainder by 4 bytes, assume it was
903 * including 'status'.
904 */
905 if (out_field[1] - 4 == remainder)
906 return remainder;
907 return out_field[1] - 8;
908 } else if (cmd == ND_CMD_CALL) {
909 struct nd_cmd_pkg *pkg = (struct nd_cmd_pkg *) in_field;
910
911 return pkg->nd_size_out;
912 }
913
914
915 return UINT_MAX;
916}
917EXPORT_SYMBOL_GPL(nd_cmd_out_size);
918
919void wait_nvdimm_bus_probe_idle(struct device *dev)
920{
921 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
922
923 do {
924 if (nvdimm_bus->probe_active == 0)
925 break;
926 nvdimm_bus_unlock(dev);
927 nd_device_unlock(dev);
928 wait_event(nvdimm_bus->wait,
929 nvdimm_bus->probe_active == 0);
930 nd_device_lock(dev);
931 nvdimm_bus_lock(dev);
932 } while (true);
933}
934
935static int nd_pmem_forget_poison_check(struct device *dev, void *data)
936{
937 struct nd_cmd_clear_error *clear_err =
938 (struct nd_cmd_clear_error *)data;
939 struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL;
940 struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL;
941 struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL;
942 struct nd_namespace_common *ndns = NULL;
943 struct nd_namespace_io *nsio;
944 resource_size_t offset = 0, end_trunc = 0, start, end, pstart, pend;
945
946 if (nd_dax || !dev->driver)
947 return 0;
948
949 start = clear_err->address;
950 end = clear_err->address + clear_err->cleared - 1;
951
952 if (nd_btt || nd_pfn || nd_dax) {
953 if (nd_btt)
954 ndns = nd_btt->ndns;
955 else if (nd_pfn)
956 ndns = nd_pfn->ndns;
957 else if (nd_dax)
958 ndns = nd_dax->nd_pfn.ndns;
959
960 if (!ndns)
961 return 0;
962 } else
963 ndns = to_ndns(dev);
964
965 nsio = to_nd_namespace_io(&ndns->dev);
966 pstart = nsio->res.start + offset;
967 pend = nsio->res.end - end_trunc;
968
969 if ((pstart >= start) && (pend <= end))
970 return -EBUSY;
971
972 return 0;
973
974}
975
976static int nd_ns_forget_poison_check(struct device *dev, void *data)
977{
978 return device_for_each_child(dev, data, nd_pmem_forget_poison_check);
979}
980
981/* set_config requires an idle interleave set */
982static int nd_cmd_clear_to_send(struct nvdimm_bus *nvdimm_bus,
983 struct nvdimm *nvdimm, unsigned int cmd, void *data)
984{
985 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
986
987 /* ask the bus provider if it would like to block this request */
988 if (nd_desc->clear_to_send) {
989 int rc = nd_desc->clear_to_send(nd_desc, nvdimm, cmd, data);
990
991 if (rc)
992 return rc;
993 }
994
995 /* require clear error to go through the pmem driver */
996 if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR)
997 return device_for_each_child(&nvdimm_bus->dev, data,
998 nd_ns_forget_poison_check);
999
1000 if (!nvdimm || cmd != ND_CMD_SET_CONFIG_DATA)
1001 return 0;
1002
1003 /* prevent label manipulation while the kernel owns label updates */
1004 wait_nvdimm_bus_probe_idle(&nvdimm_bus->dev);
1005 if (atomic_read(&nvdimm->busy))
1006 return -EBUSY;
1007 return 0;
1008}
1009
1010static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
1011 int read_only, unsigned int ioctl_cmd, unsigned long arg)
1012{
1013 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
1014 const struct nd_cmd_desc *desc = NULL;
1015 unsigned int cmd = _IOC_NR(ioctl_cmd);
1016 struct device *dev = &nvdimm_bus->dev;
1017 void __user *p = (void __user *) arg;
1018 char *out_env = NULL, *in_env = NULL;
1019 const char *cmd_name, *dimm_name;
1020 u32 in_len = 0, out_len = 0;
1021 unsigned int func = cmd;
1022 unsigned long cmd_mask;
1023 struct nd_cmd_pkg pkg;
1024 int rc, i, cmd_rc;
1025 void *buf = NULL;
1026 u64 buf_len = 0;
1027
1028 if (nvdimm) {
1029 desc = nd_cmd_dimm_desc(cmd);
1030 cmd_name = nvdimm_cmd_name(cmd);
1031 cmd_mask = nvdimm->cmd_mask;
1032 dimm_name = dev_name(&nvdimm->dev);
1033 } else {
1034 desc = nd_cmd_bus_desc(cmd);
1035 cmd_name = nvdimm_bus_cmd_name(cmd);
1036 cmd_mask = nd_desc->cmd_mask;
1037 dimm_name = "bus";
1038 }
1039
1040 /* Validate command family support against bus declared support */
1041 if (cmd == ND_CMD_CALL) {
1042 unsigned long *mask;
1043
1044 if (copy_from_user(&pkg, p, sizeof(pkg)))
1045 return -EFAULT;
1046
1047 if (nvdimm) {
1048 if (pkg.nd_family > NVDIMM_FAMILY_MAX)
1049 return -EINVAL;
1050 mask = &nd_desc->dimm_family_mask;
1051 } else {
1052 if (pkg.nd_family > NVDIMM_BUS_FAMILY_MAX)
1053 return -EINVAL;
1054 mask = &nd_desc->bus_family_mask;
1055 }
1056
1057 if (!test_bit(pkg.nd_family, mask))
1058 return -EINVAL;
1059 }
1060
1061 if (!desc ||
1062 (desc->out_num + desc->in_num == 0) ||
1063 cmd > ND_CMD_CALL ||
1064 !test_bit(cmd, &cmd_mask))
1065 return -ENOTTY;
1066
1067 /* fail write commands (when read-only) */
1068 if (read_only)
1069 switch (cmd) {
1070 case ND_CMD_VENDOR:
1071 case ND_CMD_SET_CONFIG_DATA:
1072 case ND_CMD_ARS_START:
1073 case ND_CMD_CLEAR_ERROR:
1074 case ND_CMD_CALL:
1075 dev_dbg(dev, "'%s' command while read-only.\n",
1076 nvdimm ? nvdimm_cmd_name(cmd)
1077 : nvdimm_bus_cmd_name(cmd));
1078 return -EPERM;
1079 default:
1080 break;
1081 }
1082
1083 /* process an input envelope */
1084 in_env = kzalloc(ND_CMD_MAX_ENVELOPE, GFP_KERNEL);
1085 if (!in_env)
1086 return -ENOMEM;
1087 for (i = 0; i < desc->in_num; i++) {
1088 u32 in_size, copy;
1089
1090 in_size = nd_cmd_in_size(nvdimm, cmd, desc, i, in_env);
1091 if (in_size == UINT_MAX) {
1092 dev_err(dev, "%s:%s unknown input size cmd: %s field: %d\n",
1093 __func__, dimm_name, cmd_name, i);
1094 rc = -ENXIO;
1095 goto out;
1096 }
1097 if (in_len < ND_CMD_MAX_ENVELOPE)
1098 copy = min_t(u32, ND_CMD_MAX_ENVELOPE - in_len, in_size);
1099 else
1100 copy = 0;
1101 if (copy && copy_from_user(&in_env[in_len], p + in_len, copy)) {
1102 rc = -EFAULT;
1103 goto out;
1104 }
1105 in_len += in_size;
1106 }
1107
1108 if (cmd == ND_CMD_CALL) {
1109 func = pkg.nd_command;
1110 dev_dbg(dev, "%s, idx: %llu, in: %u, out: %u, len %llu\n",
1111 dimm_name, pkg.nd_command,
1112 in_len, out_len, buf_len);
1113 }
1114
1115 /* process an output envelope */
1116 out_env = kzalloc(ND_CMD_MAX_ENVELOPE, GFP_KERNEL);
1117 if (!out_env) {
1118 rc = -ENOMEM;
1119 goto out;
1120 }
1121
1122 for (i = 0; i < desc->out_num; i++) {
1123 u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i,
1124 (u32 *) in_env, (u32 *) out_env, 0);
1125 u32 copy;
1126
1127 if (out_size == UINT_MAX) {
1128 dev_dbg(dev, "%s unknown output size cmd: %s field: %d\n",
1129 dimm_name, cmd_name, i);
1130 rc = -EFAULT;
1131 goto out;
1132 }
1133 if (out_len < ND_CMD_MAX_ENVELOPE)
1134 copy = min_t(u32, ND_CMD_MAX_ENVELOPE - out_len, out_size);
1135 else
1136 copy = 0;
1137 if (copy && copy_from_user(&out_env[out_len],
1138 p + in_len + out_len, copy)) {
1139 rc = -EFAULT;
1140 goto out;
1141 }
1142 out_len += out_size;
1143 }
1144
1145 buf_len = (u64) out_len + (u64) in_len;
1146 if (buf_len > ND_IOCTL_MAX_BUFLEN) {
1147 dev_dbg(dev, "%s cmd: %s buf_len: %llu > %d\n", dimm_name,
1148 cmd_name, buf_len, ND_IOCTL_MAX_BUFLEN);
1149 rc = -EINVAL;
1150 goto out;
1151 }
1152
1153 buf = vmalloc(buf_len);
1154 if (!buf) {
1155 rc = -ENOMEM;
1156 goto out;
1157 }
1158
1159 if (copy_from_user(buf, p, buf_len)) {
1160 rc = -EFAULT;
1161 goto out;
1162 }
1163
1164 nd_device_lock(dev);
1165 nvdimm_bus_lock(dev);
1166 rc = nd_cmd_clear_to_send(nvdimm_bus, nvdimm, func, buf);
1167 if (rc)
1168 goto out_unlock;
1169
1170 rc = nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len, &cmd_rc);
1171 if (rc < 0)
1172 goto out_unlock;
1173
1174 if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR && cmd_rc >= 0) {
1175 struct nd_cmd_clear_error *clear_err = buf;
1176
1177 nvdimm_account_cleared_poison(nvdimm_bus, clear_err->address,
1178 clear_err->cleared);
1179 }
1180
1181 if (copy_to_user(p, buf, buf_len))
1182 rc = -EFAULT;
1183
1184out_unlock:
1185 nvdimm_bus_unlock(dev);
1186 nd_device_unlock(dev);
1187out:
1188 kfree(in_env);
1189 kfree(out_env);
1190 vfree(buf);
1191 return rc;
1192}
1193
1194enum nd_ioctl_mode {
1195 BUS_IOCTL,
1196 DIMM_IOCTL,
1197};
1198
1199static int match_dimm(struct device *dev, void *data)
1200{
1201 long id = (long) data;
1202
1203 if (is_nvdimm(dev)) {
1204 struct nvdimm *nvdimm = to_nvdimm(dev);
1205
1206 return nvdimm->id == id;
1207 }
1208
1209 return 0;
1210}
1211
1212static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
1213 enum nd_ioctl_mode mode)
1214
1215{
1216 struct nvdimm_bus *nvdimm_bus, *found = NULL;
1217 long id = (long) file->private_data;
1218 struct nvdimm *nvdimm = NULL;
1219 int rc, ro;
1220
1221 ro = ((file->f_flags & O_ACCMODE) == O_RDONLY);
1222 mutex_lock(&nvdimm_bus_list_mutex);
1223 list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) {
1224 if (mode == DIMM_IOCTL) {
1225 struct device *dev;
1226
1227 dev = device_find_child(&nvdimm_bus->dev,
1228 file->private_data, match_dimm);
1229 if (!dev)
1230 continue;
1231 nvdimm = to_nvdimm(dev);
1232 found = nvdimm_bus;
1233 } else if (nvdimm_bus->id == id) {
1234 found = nvdimm_bus;
1235 }
1236
1237 if (found) {
1238 atomic_inc(&nvdimm_bus->ioctl_active);
1239 break;
1240 }
1241 }
1242 mutex_unlock(&nvdimm_bus_list_mutex);
1243
1244 if (!found)
1245 return -ENXIO;
1246
1247 nvdimm_bus = found;
1248 rc = __nd_ioctl(nvdimm_bus, nvdimm, ro, cmd, arg);
1249
1250 if (nvdimm)
1251 put_device(&nvdimm->dev);
1252 if (atomic_dec_and_test(&nvdimm_bus->ioctl_active))
1253 wake_up(&nvdimm_bus->wait);
1254
1255 return rc;
1256}
1257
1258static long bus_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1259{
1260 return nd_ioctl(file, cmd, arg, BUS_IOCTL);
1261}
1262
1263static long dimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1264{
1265 return nd_ioctl(file, cmd, arg, DIMM_IOCTL);
1266}
1267
1268static int nd_open(struct inode *inode, struct file *file)
1269{
1270 long minor = iminor(inode);
1271
1272 file->private_data = (void *) minor;
1273 return 0;
1274}
1275
1276static const struct file_operations nvdimm_bus_fops = {
1277 .owner = THIS_MODULE,
1278 .open = nd_open,
1279 .unlocked_ioctl = bus_ioctl,
1280 .compat_ioctl = compat_ptr_ioctl,
1281 .llseek = noop_llseek,
1282};
1283
1284static const struct file_operations nvdimm_fops = {
1285 .owner = THIS_MODULE,
1286 .open = nd_open,
1287 .unlocked_ioctl = dimm_ioctl,
1288 .compat_ioctl = compat_ptr_ioctl,
1289 .llseek = noop_llseek,
1290};
1291
1292int __init nvdimm_bus_init(void)
1293{
1294 int rc;
1295
1296 rc = bus_register(&nvdimm_bus_type);
1297 if (rc)
1298 return rc;
1299
1300 rc = register_chrdev(0, "ndctl", &nvdimm_bus_fops);
1301 if (rc < 0)
1302 goto err_bus_chrdev;
1303 nvdimm_bus_major = rc;
1304
1305 rc = register_chrdev(0, "dimmctl", &nvdimm_fops);
1306 if (rc < 0)
1307 goto err_dimm_chrdev;
1308 nvdimm_major = rc;
1309
1310 nd_class = class_create(THIS_MODULE, "nd");
1311 if (IS_ERR(nd_class)) {
1312 rc = PTR_ERR(nd_class);
1313 goto err_class;
1314 }
1315
1316 rc = driver_register(&nd_bus_driver.drv);
1317 if (rc)
1318 goto err_nd_bus;
1319
1320 return 0;
1321
1322 err_nd_bus:
1323 class_destroy(nd_class);
1324 err_class:
1325 unregister_chrdev(nvdimm_major, "dimmctl");
1326 err_dimm_chrdev:
1327 unregister_chrdev(nvdimm_bus_major, "ndctl");
1328 err_bus_chrdev:
1329 bus_unregister(&nvdimm_bus_type);
1330
1331 return rc;
1332}
1333
1334void nvdimm_bus_exit(void)
1335{
1336 driver_unregister(&nd_bus_driver.drv);
1337 class_destroy(nd_class);
1338 unregister_chrdev(nvdimm_bus_major, "ndctl");
1339 unregister_chrdev(nvdimm_major, "dimmctl");
1340 bus_unregister(&nvdimm_bus_type);
1341 ida_destroy(&nd_ida);
1342}
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14#include <linux/vmalloc.h>
15#include <linux/uaccess.h>
16#include <linux/module.h>
17#include <linux/blkdev.h>
18#include <linux/fcntl.h>
19#include <linux/async.h>
20#include <linux/genhd.h>
21#include <linux/ndctl.h>
22#include <linux/sched.h>
23#include <linux/slab.h>
24#include <linux/fs.h>
25#include <linux/io.h>
26#include <linux/mm.h>
27#include <linux/nd.h>
28#include "nd-core.h"
29#include "nd.h"
30
31int nvdimm_major;
32static int nvdimm_bus_major;
33static struct class *nd_class;
34
35static int to_nd_device_type(struct device *dev)
36{
37 if (is_nvdimm(dev))
38 return ND_DEVICE_DIMM;
39 else if (is_nd_pmem(dev))
40 return ND_DEVICE_REGION_PMEM;
41 else if (is_nd_blk(dev))
42 return ND_DEVICE_REGION_BLK;
43 else if (is_nd_pmem(dev->parent) || is_nd_blk(dev->parent))
44 return nd_region_to_nstype(to_nd_region(dev->parent));
45
46 return 0;
47}
48
49static int nvdimm_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
50{
51 /*
52 * Ensure that region devices always have their numa node set as
53 * early as possible.
54 */
55 if (is_nd_pmem(dev) || is_nd_blk(dev))
56 set_dev_node(dev, to_nd_region(dev)->numa_node);
57 return add_uevent_var(env, "MODALIAS=" ND_DEVICE_MODALIAS_FMT,
58 to_nd_device_type(dev));
59}
60
61static int nvdimm_bus_match(struct device *dev, struct device_driver *drv)
62{
63 struct nd_device_driver *nd_drv = to_nd_device_driver(drv);
64
65 return !!test_bit(to_nd_device_type(dev), &nd_drv->type);
66}
67
68static struct module *to_bus_provider(struct device *dev)
69{
70 /* pin bus providers while regions are enabled */
71 if (is_nd_pmem(dev) || is_nd_blk(dev)) {
72 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
73
74 return nvdimm_bus->module;
75 }
76 return NULL;
77}
78
79static void nvdimm_bus_probe_start(struct nvdimm_bus *nvdimm_bus)
80{
81 nvdimm_bus_lock(&nvdimm_bus->dev);
82 nvdimm_bus->probe_active++;
83 nvdimm_bus_unlock(&nvdimm_bus->dev);
84}
85
86static void nvdimm_bus_probe_end(struct nvdimm_bus *nvdimm_bus)
87{
88 nvdimm_bus_lock(&nvdimm_bus->dev);
89 if (--nvdimm_bus->probe_active == 0)
90 wake_up(&nvdimm_bus->probe_wait);
91 nvdimm_bus_unlock(&nvdimm_bus->dev);
92}
93
94static int nvdimm_bus_probe(struct device *dev)
95{
96 struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
97 struct module *provider = to_bus_provider(dev);
98 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
99 int rc;
100
101 if (!try_module_get(provider))
102 return -ENXIO;
103
104 nvdimm_bus_probe_start(nvdimm_bus);
105 rc = nd_drv->probe(dev);
106 if (rc == 0)
107 nd_region_probe_success(nvdimm_bus, dev);
108 else
109 nd_region_disable(nvdimm_bus, dev);
110 nvdimm_bus_probe_end(nvdimm_bus);
111
112 dev_dbg(&nvdimm_bus->dev, "%s.probe(%s) = %d\n", dev->driver->name,
113 dev_name(dev), rc);
114
115 if (rc != 0)
116 module_put(provider);
117 return rc;
118}
119
120static int nvdimm_bus_remove(struct device *dev)
121{
122 struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
123 struct module *provider = to_bus_provider(dev);
124 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
125 int rc;
126
127 rc = nd_drv->remove(dev);
128 nd_region_disable(nvdimm_bus, dev);
129
130 dev_dbg(&nvdimm_bus->dev, "%s.remove(%s) = %d\n", dev->driver->name,
131 dev_name(dev), rc);
132 module_put(provider);
133 return rc;
134}
135
136void nd_device_notify(struct device *dev, enum nvdimm_event event)
137{
138 device_lock(dev);
139 if (dev->driver) {
140 struct nd_device_driver *nd_drv;
141
142 nd_drv = to_nd_device_driver(dev->driver);
143 if (nd_drv->notify)
144 nd_drv->notify(dev, event);
145 }
146 device_unlock(dev);
147}
148EXPORT_SYMBOL(nd_device_notify);
149
150void nvdimm_region_notify(struct nd_region *nd_region, enum nvdimm_event event)
151{
152 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
153
154 if (!nvdimm_bus)
155 return;
156
157 /* caller is responsible for holding a reference on the device */
158 nd_device_notify(&nd_region->dev, event);
159}
160EXPORT_SYMBOL_GPL(nvdimm_region_notify);
161
162long nvdimm_clear_poison(struct device *dev, phys_addr_t phys,
163 unsigned int len)
164{
165 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
166 struct nvdimm_bus_descriptor *nd_desc;
167 struct nd_cmd_clear_error clear_err;
168 struct nd_cmd_ars_cap ars_cap;
169 u32 clear_err_unit, mask;
170 int cmd_rc, rc;
171
172 if (!nvdimm_bus)
173 return -ENXIO;
174
175 nd_desc = nvdimm_bus->nd_desc;
176 if (!nd_desc->ndctl)
177 return -ENXIO;
178
179 memset(&ars_cap, 0, sizeof(ars_cap));
180 ars_cap.address = phys;
181 ars_cap.length = len;
182 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, &ars_cap,
183 sizeof(ars_cap), &cmd_rc);
184 if (rc < 0)
185 return rc;
186 if (cmd_rc < 0)
187 return cmd_rc;
188 clear_err_unit = ars_cap.clear_err_unit;
189 if (!clear_err_unit || !is_power_of_2(clear_err_unit))
190 return -ENXIO;
191
192 mask = clear_err_unit - 1;
193 if ((phys | len) & mask)
194 return -ENXIO;
195 memset(&clear_err, 0, sizeof(clear_err));
196 clear_err.address = phys;
197 clear_err.length = len;
198 rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_CLEAR_ERROR, &clear_err,
199 sizeof(clear_err), &cmd_rc);
200 if (rc < 0)
201 return rc;
202 if (cmd_rc < 0)
203 return cmd_rc;
204 return clear_err.cleared;
205}
206EXPORT_SYMBOL_GPL(nvdimm_clear_poison);
207
208static struct bus_type nvdimm_bus_type = {
209 .name = "nd",
210 .uevent = nvdimm_bus_uevent,
211 .match = nvdimm_bus_match,
212 .probe = nvdimm_bus_probe,
213 .remove = nvdimm_bus_remove,
214};
215
216static ASYNC_DOMAIN_EXCLUSIVE(nd_async_domain);
217
218void nd_synchronize(void)
219{
220 async_synchronize_full_domain(&nd_async_domain);
221}
222EXPORT_SYMBOL_GPL(nd_synchronize);
223
224static void nd_async_device_register(void *d, async_cookie_t cookie)
225{
226 struct device *dev = d;
227
228 if (device_add(dev) != 0) {
229 dev_err(dev, "%s: failed\n", __func__);
230 put_device(dev);
231 }
232 put_device(dev);
233}
234
235static void nd_async_device_unregister(void *d, async_cookie_t cookie)
236{
237 struct device *dev = d;
238
239 /* flush bus operations before delete */
240 nvdimm_bus_lock(dev);
241 nvdimm_bus_unlock(dev);
242
243 device_unregister(dev);
244 put_device(dev);
245}
246
247void __nd_device_register(struct device *dev)
248{
249 dev->bus = &nvdimm_bus_type;
250 get_device(dev);
251 async_schedule_domain(nd_async_device_register, dev,
252 &nd_async_domain);
253}
254
255void nd_device_register(struct device *dev)
256{
257 device_initialize(dev);
258 __nd_device_register(dev);
259}
260EXPORT_SYMBOL(nd_device_register);
261
262void nd_device_unregister(struct device *dev, enum nd_async_mode mode)
263{
264 switch (mode) {
265 case ND_ASYNC:
266 get_device(dev);
267 async_schedule_domain(nd_async_device_unregister, dev,
268 &nd_async_domain);
269 break;
270 case ND_SYNC:
271 nd_synchronize();
272 device_unregister(dev);
273 break;
274 }
275}
276EXPORT_SYMBOL(nd_device_unregister);
277
278/**
279 * __nd_driver_register() - register a region or a namespace driver
280 * @nd_drv: driver to register
281 * @owner: automatically set by nd_driver_register() macro
282 * @mod_name: automatically set by nd_driver_register() macro
283 */
284int __nd_driver_register(struct nd_device_driver *nd_drv, struct module *owner,
285 const char *mod_name)
286{
287 struct device_driver *drv = &nd_drv->drv;
288
289 if (!nd_drv->type) {
290 pr_debug("driver type bitmask not set (%pf)\n",
291 __builtin_return_address(0));
292 return -EINVAL;
293 }
294
295 if (!nd_drv->probe || !nd_drv->remove) {
296 pr_debug("->probe() and ->remove() must be specified\n");
297 return -EINVAL;
298 }
299
300 drv->bus = &nvdimm_bus_type;
301 drv->owner = owner;
302 drv->mod_name = mod_name;
303
304 return driver_register(drv);
305}
306EXPORT_SYMBOL(__nd_driver_register);
307
308int nvdimm_revalidate_disk(struct gendisk *disk)
309{
310 struct device *dev = disk->driverfs_dev;
311 struct nd_region *nd_region = to_nd_region(dev->parent);
312 const char *pol = nd_region->ro ? "only" : "write";
313
314 if (nd_region->ro == get_disk_ro(disk))
315 return 0;
316
317 dev_info(dev, "%s read-%s, marking %s read-%s\n",
318 dev_name(&nd_region->dev), pol, disk->disk_name, pol);
319 set_disk_ro(disk, nd_region->ro);
320
321 return 0;
322
323}
324EXPORT_SYMBOL(nvdimm_revalidate_disk);
325
326static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
327 char *buf)
328{
329 return sprintf(buf, ND_DEVICE_MODALIAS_FMT "\n",
330 to_nd_device_type(dev));
331}
332static DEVICE_ATTR_RO(modalias);
333
334static ssize_t devtype_show(struct device *dev, struct device_attribute *attr,
335 char *buf)
336{
337 return sprintf(buf, "%s\n", dev->type->name);
338}
339static DEVICE_ATTR_RO(devtype);
340
341static struct attribute *nd_device_attributes[] = {
342 &dev_attr_modalias.attr,
343 &dev_attr_devtype.attr,
344 NULL,
345};
346
347/**
348 * nd_device_attribute_group - generic attributes for all devices on an nd bus
349 */
350struct attribute_group nd_device_attribute_group = {
351 .attrs = nd_device_attributes,
352};
353EXPORT_SYMBOL_GPL(nd_device_attribute_group);
354
355static ssize_t numa_node_show(struct device *dev,
356 struct device_attribute *attr, char *buf)
357{
358 return sprintf(buf, "%d\n", dev_to_node(dev));
359}
360static DEVICE_ATTR_RO(numa_node);
361
362static struct attribute *nd_numa_attributes[] = {
363 &dev_attr_numa_node.attr,
364 NULL,
365};
366
367static umode_t nd_numa_attr_visible(struct kobject *kobj, struct attribute *a,
368 int n)
369{
370 if (!IS_ENABLED(CONFIG_NUMA))
371 return 0;
372
373 return a->mode;
374}
375
376/**
377 * nd_numa_attribute_group - NUMA attributes for all devices on an nd bus
378 */
379struct attribute_group nd_numa_attribute_group = {
380 .attrs = nd_numa_attributes,
381 .is_visible = nd_numa_attr_visible,
382};
383EXPORT_SYMBOL_GPL(nd_numa_attribute_group);
384
385int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus)
386{
387 dev_t devt = MKDEV(nvdimm_bus_major, nvdimm_bus->id);
388 struct device *dev;
389
390 dev = device_create(nd_class, &nvdimm_bus->dev, devt, nvdimm_bus,
391 "ndctl%d", nvdimm_bus->id);
392
393 if (IS_ERR(dev)) {
394 dev_dbg(&nvdimm_bus->dev, "failed to register ndctl%d: %ld\n",
395 nvdimm_bus->id, PTR_ERR(dev));
396 return PTR_ERR(dev);
397 }
398 return 0;
399}
400
401void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus)
402{
403 device_destroy(nd_class, MKDEV(nvdimm_bus_major, nvdimm_bus->id));
404}
405
406static const struct nd_cmd_desc __nd_cmd_dimm_descs[] = {
407 [ND_CMD_IMPLEMENTED] = { },
408 [ND_CMD_SMART] = {
409 .out_num = 2,
410 .out_sizes = { 4, 128, },
411 },
412 [ND_CMD_SMART_THRESHOLD] = {
413 .out_num = 2,
414 .out_sizes = { 4, 8, },
415 },
416 [ND_CMD_DIMM_FLAGS] = {
417 .out_num = 2,
418 .out_sizes = { 4, 4 },
419 },
420 [ND_CMD_GET_CONFIG_SIZE] = {
421 .out_num = 3,
422 .out_sizes = { 4, 4, 4, },
423 },
424 [ND_CMD_GET_CONFIG_DATA] = {
425 .in_num = 2,
426 .in_sizes = { 4, 4, },
427 .out_num = 2,
428 .out_sizes = { 4, UINT_MAX, },
429 },
430 [ND_CMD_SET_CONFIG_DATA] = {
431 .in_num = 3,
432 .in_sizes = { 4, 4, UINT_MAX, },
433 .out_num = 1,
434 .out_sizes = { 4, },
435 },
436 [ND_CMD_VENDOR] = {
437 .in_num = 3,
438 .in_sizes = { 4, 4, UINT_MAX, },
439 .out_num = 3,
440 .out_sizes = { 4, 4, UINT_MAX, },
441 },
442};
443
444const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd)
445{
446 if (cmd < ARRAY_SIZE(__nd_cmd_dimm_descs))
447 return &__nd_cmd_dimm_descs[cmd];
448 return NULL;
449}
450EXPORT_SYMBOL_GPL(nd_cmd_dimm_desc);
451
452static const struct nd_cmd_desc __nd_cmd_bus_descs[] = {
453 [ND_CMD_IMPLEMENTED] = { },
454 [ND_CMD_ARS_CAP] = {
455 .in_num = 2,
456 .in_sizes = { 8, 8, },
457 .out_num = 4,
458 .out_sizes = { 4, 4, 4, 4, },
459 },
460 [ND_CMD_ARS_START] = {
461 .in_num = 5,
462 .in_sizes = { 8, 8, 2, 1, 5, },
463 .out_num = 2,
464 .out_sizes = { 4, 4, },
465 },
466 [ND_CMD_ARS_STATUS] = {
467 .out_num = 3,
468 .out_sizes = { 4, 4, UINT_MAX, },
469 },
470 [ND_CMD_CLEAR_ERROR] = {
471 .in_num = 2,
472 .in_sizes = { 8, 8, },
473 .out_num = 3,
474 .out_sizes = { 4, 4, 8, },
475 },
476};
477
478const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd)
479{
480 if (cmd < ARRAY_SIZE(__nd_cmd_bus_descs))
481 return &__nd_cmd_bus_descs[cmd];
482 return NULL;
483}
484EXPORT_SYMBOL_GPL(nd_cmd_bus_desc);
485
486u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
487 const struct nd_cmd_desc *desc, int idx, void *buf)
488{
489 if (idx >= desc->in_num)
490 return UINT_MAX;
491
492 if (desc->in_sizes[idx] < UINT_MAX)
493 return desc->in_sizes[idx];
494
495 if (nvdimm && cmd == ND_CMD_SET_CONFIG_DATA && idx == 2) {
496 struct nd_cmd_set_config_hdr *hdr = buf;
497
498 return hdr->in_length;
499 } else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) {
500 struct nd_cmd_vendor_hdr *hdr = buf;
501
502 return hdr->in_length;
503 }
504
505 return UINT_MAX;
506}
507EXPORT_SYMBOL_GPL(nd_cmd_in_size);
508
509u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
510 const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
511 const u32 *out_field)
512{
513 if (idx >= desc->out_num)
514 return UINT_MAX;
515
516 if (desc->out_sizes[idx] < UINT_MAX)
517 return desc->out_sizes[idx];
518
519 if (nvdimm && cmd == ND_CMD_GET_CONFIG_DATA && idx == 1)
520 return in_field[1];
521 else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2)
522 return out_field[1];
523 else if (!nvdimm && cmd == ND_CMD_ARS_STATUS && idx == 2)
524 return out_field[1] - 8;
525
526 return UINT_MAX;
527}
528EXPORT_SYMBOL_GPL(nd_cmd_out_size);
529
530void wait_nvdimm_bus_probe_idle(struct device *dev)
531{
532 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
533
534 do {
535 if (nvdimm_bus->probe_active == 0)
536 break;
537 nvdimm_bus_unlock(&nvdimm_bus->dev);
538 wait_event(nvdimm_bus->probe_wait,
539 nvdimm_bus->probe_active == 0);
540 nvdimm_bus_lock(&nvdimm_bus->dev);
541 } while (true);
542}
543
544static int pmem_active(struct device *dev, void *data)
545{
546 if (is_nd_pmem(dev) && dev->driver)
547 return -EBUSY;
548 return 0;
549}
550
551/* set_config requires an idle interleave set */
552static int nd_cmd_clear_to_send(struct nvdimm_bus *nvdimm_bus,
553 struct nvdimm *nvdimm, unsigned int cmd)
554{
555 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
556
557 /* ask the bus provider if it would like to block this request */
558 if (nd_desc->clear_to_send) {
559 int rc = nd_desc->clear_to_send(nd_desc, nvdimm, cmd);
560
561 if (rc)
562 return rc;
563 }
564
565 /* require clear error to go through the pmem driver */
566 if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR)
567 return device_for_each_child(&nvdimm_bus->dev, NULL,
568 pmem_active);
569
570 if (!nvdimm || cmd != ND_CMD_SET_CONFIG_DATA)
571 return 0;
572
573 /* prevent label manipulation while the kernel owns label updates */
574 wait_nvdimm_bus_probe_idle(&nvdimm_bus->dev);
575 if (atomic_read(&nvdimm->busy))
576 return -EBUSY;
577 return 0;
578}
579
580static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
581 int read_only, unsigned int ioctl_cmd, unsigned long arg)
582{
583 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
584 size_t buf_len = 0, in_len = 0, out_len = 0;
585 static char out_env[ND_CMD_MAX_ENVELOPE];
586 static char in_env[ND_CMD_MAX_ENVELOPE];
587 const struct nd_cmd_desc *desc = NULL;
588 unsigned int cmd = _IOC_NR(ioctl_cmd);
589 void __user *p = (void __user *) arg;
590 struct device *dev = &nvdimm_bus->dev;
591 const char *cmd_name, *dimm_name;
592 unsigned long dsm_mask;
593 void *buf;
594 int rc, i;
595
596 if (nvdimm) {
597 desc = nd_cmd_dimm_desc(cmd);
598 cmd_name = nvdimm_cmd_name(cmd);
599 dsm_mask = nvdimm->dsm_mask ? *(nvdimm->dsm_mask) : 0;
600 dimm_name = dev_name(&nvdimm->dev);
601 } else {
602 desc = nd_cmd_bus_desc(cmd);
603 cmd_name = nvdimm_bus_cmd_name(cmd);
604 dsm_mask = nd_desc->dsm_mask;
605 dimm_name = "bus";
606 }
607
608 if (!desc || (desc->out_num + desc->in_num == 0) ||
609 !test_bit(cmd, &dsm_mask))
610 return -ENOTTY;
611
612 /* fail write commands (when read-only) */
613 if (read_only)
614 switch (cmd) {
615 case ND_CMD_VENDOR:
616 case ND_CMD_SET_CONFIG_DATA:
617 case ND_CMD_ARS_START:
618 case ND_CMD_CLEAR_ERROR:
619 dev_dbg(&nvdimm_bus->dev, "'%s' command while read-only.\n",
620 nvdimm ? nvdimm_cmd_name(cmd)
621 : nvdimm_bus_cmd_name(cmd));
622 return -EPERM;
623 default:
624 break;
625 }
626
627 /* process an input envelope */
628 for (i = 0; i < desc->in_num; i++) {
629 u32 in_size, copy;
630
631 in_size = nd_cmd_in_size(nvdimm, cmd, desc, i, in_env);
632 if (in_size == UINT_MAX) {
633 dev_err(dev, "%s:%s unknown input size cmd: %s field: %d\n",
634 __func__, dimm_name, cmd_name, i);
635 return -ENXIO;
636 }
637 if (in_len < sizeof(in_env))
638 copy = min_t(u32, sizeof(in_env) - in_len, in_size);
639 else
640 copy = 0;
641 if (copy && copy_from_user(&in_env[in_len], p + in_len, copy))
642 return -EFAULT;
643 in_len += in_size;
644 }
645
646 /* process an output envelope */
647 for (i = 0; i < desc->out_num; i++) {
648 u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i,
649 (u32 *) in_env, (u32 *) out_env);
650 u32 copy;
651
652 if (out_size == UINT_MAX) {
653 dev_dbg(dev, "%s:%s unknown output size cmd: %s field: %d\n",
654 __func__, dimm_name, cmd_name, i);
655 return -EFAULT;
656 }
657 if (out_len < sizeof(out_env))
658 copy = min_t(u32, sizeof(out_env) - out_len, out_size);
659 else
660 copy = 0;
661 if (copy && copy_from_user(&out_env[out_len],
662 p + in_len + out_len, copy))
663 return -EFAULT;
664 out_len += out_size;
665 }
666
667 buf_len = out_len + in_len;
668 if (buf_len > ND_IOCTL_MAX_BUFLEN) {
669 dev_dbg(dev, "%s:%s cmd: %s buf_len: %zu > %d\n", __func__,
670 dimm_name, cmd_name, buf_len,
671 ND_IOCTL_MAX_BUFLEN);
672 return -EINVAL;
673 }
674
675 buf = vmalloc(buf_len);
676 if (!buf)
677 return -ENOMEM;
678
679 if (copy_from_user(buf, p, buf_len)) {
680 rc = -EFAULT;
681 goto out;
682 }
683
684 nvdimm_bus_lock(&nvdimm_bus->dev);
685 rc = nd_cmd_clear_to_send(nvdimm_bus, nvdimm, cmd);
686 if (rc)
687 goto out_unlock;
688
689 rc = nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len, NULL);
690 if (rc < 0)
691 goto out_unlock;
692 if (copy_to_user(p, buf, buf_len))
693 rc = -EFAULT;
694 out_unlock:
695 nvdimm_bus_unlock(&nvdimm_bus->dev);
696 out:
697 vfree(buf);
698 return rc;
699}
700
701static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
702{
703 long id = (long) file->private_data;
704 int rc = -ENXIO, ro;
705 struct nvdimm_bus *nvdimm_bus;
706
707 ro = ((file->f_flags & O_ACCMODE) == O_RDONLY);
708 mutex_lock(&nvdimm_bus_list_mutex);
709 list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) {
710 if (nvdimm_bus->id == id) {
711 rc = __nd_ioctl(nvdimm_bus, NULL, ro, cmd, arg);
712 break;
713 }
714 }
715 mutex_unlock(&nvdimm_bus_list_mutex);
716
717 return rc;
718}
719
720static int match_dimm(struct device *dev, void *data)
721{
722 long id = (long) data;
723
724 if (is_nvdimm(dev)) {
725 struct nvdimm *nvdimm = to_nvdimm(dev);
726
727 return nvdimm->id == id;
728 }
729
730 return 0;
731}
732
733static long nvdimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
734{
735 int rc = -ENXIO, ro;
736 struct nvdimm_bus *nvdimm_bus;
737
738 ro = ((file->f_flags & O_ACCMODE) == O_RDONLY);
739 mutex_lock(&nvdimm_bus_list_mutex);
740 list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) {
741 struct device *dev = device_find_child(&nvdimm_bus->dev,
742 file->private_data, match_dimm);
743 struct nvdimm *nvdimm;
744
745 if (!dev)
746 continue;
747
748 nvdimm = to_nvdimm(dev);
749 rc = __nd_ioctl(nvdimm_bus, nvdimm, ro, cmd, arg);
750 put_device(dev);
751 break;
752 }
753 mutex_unlock(&nvdimm_bus_list_mutex);
754
755 return rc;
756}
757
758static int nd_open(struct inode *inode, struct file *file)
759{
760 long minor = iminor(inode);
761
762 file->private_data = (void *) minor;
763 return 0;
764}
765
766static const struct file_operations nvdimm_bus_fops = {
767 .owner = THIS_MODULE,
768 .open = nd_open,
769 .unlocked_ioctl = nd_ioctl,
770 .compat_ioctl = nd_ioctl,
771 .llseek = noop_llseek,
772};
773
774static const struct file_operations nvdimm_fops = {
775 .owner = THIS_MODULE,
776 .open = nd_open,
777 .unlocked_ioctl = nvdimm_ioctl,
778 .compat_ioctl = nvdimm_ioctl,
779 .llseek = noop_llseek,
780};
781
782int __init nvdimm_bus_init(void)
783{
784 int rc;
785
786 rc = bus_register(&nvdimm_bus_type);
787 if (rc)
788 return rc;
789
790 rc = register_chrdev(0, "ndctl", &nvdimm_bus_fops);
791 if (rc < 0)
792 goto err_bus_chrdev;
793 nvdimm_bus_major = rc;
794
795 rc = register_chrdev(0, "dimmctl", &nvdimm_fops);
796 if (rc < 0)
797 goto err_dimm_chrdev;
798 nvdimm_major = rc;
799
800 nd_class = class_create(THIS_MODULE, "nd");
801 if (IS_ERR(nd_class)) {
802 rc = PTR_ERR(nd_class);
803 goto err_class;
804 }
805
806 return 0;
807
808 err_class:
809 unregister_chrdev(nvdimm_major, "dimmctl");
810 err_dimm_chrdev:
811 unregister_chrdev(nvdimm_bus_major, "ndctl");
812 err_bus_chrdev:
813 bus_unregister(&nvdimm_bus_type);
814
815 return rc;
816}
817
818void nvdimm_bus_exit(void)
819{
820 class_destroy(nd_class);
821 unregister_chrdev(nvdimm_bus_major, "ndctl");
822 unregister_chrdev(nvdimm_major, "dimmctl");
823 bus_unregister(&nvdimm_bus_type);
824}