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45def22c DW |
1 | /* |
2 | * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | */ | |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
62232e45 | 14 | #include <linux/vmalloc.h> |
45def22c | 15 | #include <linux/uaccess.h> |
3d88002e | 16 | #include <linux/module.h> |
8c2f7e86 | 17 | #include <linux/blkdev.h> |
45def22c | 18 | #include <linux/fcntl.h> |
e6dfb2de | 19 | #include <linux/async.h> |
8c2f7e86 | 20 | #include <linux/genhd.h> |
62232e45 | 21 | #include <linux/ndctl.h> |
4d88a97a | 22 | #include <linux/sched.h> |
45def22c DW |
23 | #include <linux/slab.h> |
24 | #include <linux/fs.h> | |
25 | #include <linux/io.h> | |
62232e45 | 26 | #include <linux/mm.h> |
4d88a97a | 27 | #include <linux/nd.h> |
45def22c | 28 | #include "nd-core.h" |
4d88a97a | 29 | #include "nd.h" |
45def22c | 30 | |
62232e45 | 31 | int nvdimm_major; |
45def22c DW |
32 | static int nvdimm_bus_major; |
33 | static struct class *nd_class; | |
18515942 | 34 | static DEFINE_IDA(nd_ida); |
45def22c | 35 | |
4d88a97a DW |
36 | static int to_nd_device_type(struct device *dev) |
37 | { | |
38 | if (is_nvdimm(dev)) | |
39 | return ND_DEVICE_DIMM; | |
3d88002e DW |
40 | else if (is_nd_pmem(dev)) |
41 | return ND_DEVICE_REGION_PMEM; | |
42 | else if (is_nd_blk(dev)) | |
43 | return ND_DEVICE_REGION_BLK; | |
cd03412a DW |
44 | else if (is_nd_dax(dev)) |
45 | return ND_DEVICE_DAX_PMEM; | |
3d88002e DW |
46 | else if (is_nd_pmem(dev->parent) || is_nd_blk(dev->parent)) |
47 | return nd_region_to_nstype(to_nd_region(dev->parent)); | |
4d88a97a DW |
48 | |
49 | return 0; | |
50 | } | |
51 | ||
52 | static int nvdimm_bus_uevent(struct device *dev, struct kobj_uevent_env *env) | |
53 | { | |
41d7a6d6 TK |
54 | /* |
55 | * Ensure that region devices always have their numa node set as | |
56 | * early as possible. | |
57 | */ | |
58 | if (is_nd_pmem(dev) || is_nd_blk(dev)) | |
59 | set_dev_node(dev, to_nd_region(dev)->numa_node); | |
4d88a97a DW |
60 | return add_uevent_var(env, "MODALIAS=" ND_DEVICE_MODALIAS_FMT, |
61 | to_nd_device_type(dev)); | |
62 | } | |
63 | ||
3d88002e DW |
64 | static struct module *to_bus_provider(struct device *dev) |
65 | { | |
66 | /* pin bus providers while regions are enabled */ | |
67 | if (is_nd_pmem(dev) || is_nd_blk(dev)) { | |
68 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
69 | ||
bc9775d8 | 70 | return nvdimm_bus->nd_desc->module; |
3d88002e DW |
71 | } |
72 | return NULL; | |
73 | } | |
74 | ||
eaf96153 DW |
75 | static void nvdimm_bus_probe_start(struct nvdimm_bus *nvdimm_bus) |
76 | { | |
77 | nvdimm_bus_lock(&nvdimm_bus->dev); | |
78 | nvdimm_bus->probe_active++; | |
79 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
80 | } | |
81 | ||
82 | static void nvdimm_bus_probe_end(struct nvdimm_bus *nvdimm_bus) | |
83 | { | |
84 | nvdimm_bus_lock(&nvdimm_bus->dev); | |
85 | if (--nvdimm_bus->probe_active == 0) | |
86 | wake_up(&nvdimm_bus->probe_wait); | |
87 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
88 | } | |
89 | ||
4d88a97a DW |
90 | static int nvdimm_bus_probe(struct device *dev) |
91 | { | |
92 | struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver); | |
3d88002e | 93 | struct module *provider = to_bus_provider(dev); |
4d88a97a DW |
94 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
95 | int rc; | |
96 | ||
3d88002e DW |
97 | if (!try_module_get(provider)) |
98 | return -ENXIO; | |
99 | ||
eaf96153 | 100 | nvdimm_bus_probe_start(nvdimm_bus); |
4d88a97a | 101 | rc = nd_drv->probe(dev); |
eaf96153 DW |
102 | if (rc == 0) |
103 | nd_region_probe_success(nvdimm_bus, dev); | |
bf9bccc1 DW |
104 | else |
105 | nd_region_disable(nvdimm_bus, dev); | |
eaf96153 DW |
106 | nvdimm_bus_probe_end(nvdimm_bus); |
107 | ||
4d88a97a DW |
108 | dev_dbg(&nvdimm_bus->dev, "%s.probe(%s) = %d\n", dev->driver->name, |
109 | dev_name(dev), rc); | |
8c2f7e86 | 110 | |
3d88002e DW |
111 | if (rc != 0) |
112 | module_put(provider); | |
4d88a97a DW |
113 | return rc; |
114 | } | |
115 | ||
116 | static int nvdimm_bus_remove(struct device *dev) | |
117 | { | |
118 | struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver); | |
3d88002e | 119 | struct module *provider = to_bus_provider(dev); |
4d88a97a | 120 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
6cf9c5ba | 121 | int rc = 0; |
4d88a97a | 122 | |
6cf9c5ba DW |
123 | if (nd_drv->remove) |
124 | rc = nd_drv->remove(dev); | |
eaf96153 DW |
125 | nd_region_disable(nvdimm_bus, dev); |
126 | ||
4d88a97a DW |
127 | dev_dbg(&nvdimm_bus->dev, "%s.remove(%s) = %d\n", dev->driver->name, |
128 | dev_name(dev), rc); | |
3d88002e | 129 | module_put(provider); |
4d88a97a DW |
130 | return rc; |
131 | } | |
132 | ||
476f848a DW |
133 | static void nvdimm_bus_shutdown(struct device *dev) |
134 | { | |
135 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
136 | struct nd_device_driver *nd_drv = NULL; | |
137 | ||
138 | if (dev->driver) | |
139 | nd_drv = to_nd_device_driver(dev->driver); | |
140 | ||
141 | if (nd_drv && nd_drv->shutdown) { | |
142 | nd_drv->shutdown(dev); | |
143 | dev_dbg(&nvdimm_bus->dev, "%s.shutdown(%s)\n", | |
144 | dev->driver->name, dev_name(dev)); | |
145 | } | |
146 | } | |
147 | ||
71999466 DW |
148 | void nd_device_notify(struct device *dev, enum nvdimm_event event) |
149 | { | |
150 | device_lock(dev); | |
151 | if (dev->driver) { | |
152 | struct nd_device_driver *nd_drv; | |
153 | ||
154 | nd_drv = to_nd_device_driver(dev->driver); | |
155 | if (nd_drv->notify) | |
156 | nd_drv->notify(dev, event); | |
157 | } | |
158 | device_unlock(dev); | |
159 | } | |
160 | EXPORT_SYMBOL(nd_device_notify); | |
161 | ||
162 | void nvdimm_region_notify(struct nd_region *nd_region, enum nvdimm_event event) | |
163 | { | |
164 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev); | |
165 | ||
166 | if (!nvdimm_bus) | |
167 | return; | |
168 | ||
169 | /* caller is responsible for holding a reference on the device */ | |
170 | nd_device_notify(&nd_region->dev, event); | |
171 | } | |
172 | EXPORT_SYMBOL_GPL(nvdimm_region_notify); | |
173 | ||
59e64739 DW |
174 | long nvdimm_clear_poison(struct device *dev, phys_addr_t phys, |
175 | unsigned int len) | |
176 | { | |
177 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
178 | struct nvdimm_bus_descriptor *nd_desc; | |
179 | struct nd_cmd_clear_error clear_err; | |
180 | struct nd_cmd_ars_cap ars_cap; | |
181 | u32 clear_err_unit, mask; | |
182 | int cmd_rc, rc; | |
183 | ||
184 | if (!nvdimm_bus) | |
185 | return -ENXIO; | |
186 | ||
187 | nd_desc = nvdimm_bus->nd_desc; | |
1e8b8d96 DJ |
188 | /* |
189 | * if ndctl does not exist, it's PMEM_LEGACY and | |
190 | * we want to just pretend everything is handled. | |
191 | */ | |
59e64739 | 192 | if (!nd_desc->ndctl) |
1e8b8d96 | 193 | return len; |
59e64739 DW |
194 | |
195 | memset(&ars_cap, 0, sizeof(ars_cap)); | |
196 | ars_cap.address = phys; | |
197 | ars_cap.length = len; | |
198 | rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, &ars_cap, | |
199 | sizeof(ars_cap), &cmd_rc); | |
200 | if (rc < 0) | |
201 | return rc; | |
202 | if (cmd_rc < 0) | |
203 | return cmd_rc; | |
204 | clear_err_unit = ars_cap.clear_err_unit; | |
205 | if (!clear_err_unit || !is_power_of_2(clear_err_unit)) | |
206 | return -ENXIO; | |
207 | ||
208 | mask = clear_err_unit - 1; | |
209 | if ((phys | len) & mask) | |
210 | return -ENXIO; | |
211 | memset(&clear_err, 0, sizeof(clear_err)); | |
212 | clear_err.address = phys; | |
213 | clear_err.length = len; | |
214 | rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_CLEAR_ERROR, &clear_err, | |
215 | sizeof(clear_err), &cmd_rc); | |
216 | if (rc < 0) | |
217 | return rc; | |
218 | if (cmd_rc < 0) | |
219 | return cmd_rc; | |
220 | return clear_err.cleared; | |
221 | } | |
222 | EXPORT_SYMBOL_GPL(nvdimm_clear_poison); | |
223 | ||
18515942 DW |
224 | static int nvdimm_bus_match(struct device *dev, struct device_driver *drv); |
225 | ||
4d88a97a | 226 | static struct bus_type nvdimm_bus_type = { |
e6dfb2de | 227 | .name = "nd", |
4d88a97a DW |
228 | .uevent = nvdimm_bus_uevent, |
229 | .match = nvdimm_bus_match, | |
230 | .probe = nvdimm_bus_probe, | |
231 | .remove = nvdimm_bus_remove, | |
476f848a | 232 | .shutdown = nvdimm_bus_shutdown, |
4d88a97a DW |
233 | }; |
234 | ||
18515942 DW |
235 | static void nvdimm_bus_release(struct device *dev) |
236 | { | |
237 | struct nvdimm_bus *nvdimm_bus; | |
238 | ||
239 | nvdimm_bus = container_of(dev, struct nvdimm_bus, dev); | |
240 | ida_simple_remove(&nd_ida, nvdimm_bus->id); | |
241 | kfree(nvdimm_bus); | |
242 | } | |
243 | ||
244 | static bool is_nvdimm_bus(struct device *dev) | |
245 | { | |
246 | return dev->release == nvdimm_bus_release; | |
247 | } | |
248 | ||
249 | struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev) | |
250 | { | |
251 | struct device *dev; | |
252 | ||
253 | for (dev = nd_dev; dev; dev = dev->parent) | |
254 | if (is_nvdimm_bus(dev)) | |
255 | break; | |
256 | dev_WARN_ONCE(nd_dev, !dev, "invalid dev, not on nd bus\n"); | |
257 | if (dev) | |
258 | return to_nvdimm_bus(dev); | |
259 | return NULL; | |
260 | } | |
261 | ||
262 | struct nvdimm_bus *to_nvdimm_bus(struct device *dev) | |
263 | { | |
264 | struct nvdimm_bus *nvdimm_bus; | |
265 | ||
266 | nvdimm_bus = container_of(dev, struct nvdimm_bus, dev); | |
267 | WARN_ON(!is_nvdimm_bus(dev)); | |
268 | return nvdimm_bus; | |
269 | } | |
270 | EXPORT_SYMBOL_GPL(to_nvdimm_bus); | |
271 | ||
272 | struct nvdimm_bus *nvdimm_bus_register(struct device *parent, | |
273 | struct nvdimm_bus_descriptor *nd_desc) | |
274 | { | |
275 | struct nvdimm_bus *nvdimm_bus; | |
276 | int rc; | |
277 | ||
278 | nvdimm_bus = kzalloc(sizeof(*nvdimm_bus), GFP_KERNEL); | |
279 | if (!nvdimm_bus) | |
280 | return NULL; | |
281 | INIT_LIST_HEAD(&nvdimm_bus->list); | |
282 | INIT_LIST_HEAD(&nvdimm_bus->mapping_list); | |
283 | INIT_LIST_HEAD(&nvdimm_bus->poison_list); | |
284 | init_waitqueue_head(&nvdimm_bus->probe_wait); | |
285 | nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL); | |
286 | mutex_init(&nvdimm_bus->reconfig_mutex); | |
287 | if (nvdimm_bus->id < 0) { | |
288 | kfree(nvdimm_bus); | |
289 | return NULL; | |
290 | } | |
291 | nvdimm_bus->nd_desc = nd_desc; | |
292 | nvdimm_bus->dev.parent = parent; | |
293 | nvdimm_bus->dev.release = nvdimm_bus_release; | |
294 | nvdimm_bus->dev.groups = nd_desc->attr_groups; | |
295 | nvdimm_bus->dev.bus = &nvdimm_bus_type; | |
296 | dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id); | |
297 | rc = device_register(&nvdimm_bus->dev); | |
298 | if (rc) { | |
299 | dev_dbg(&nvdimm_bus->dev, "registration failed: %d\n", rc); | |
300 | goto err; | |
301 | } | |
302 | ||
303 | return nvdimm_bus; | |
304 | err: | |
305 | put_device(&nvdimm_bus->dev); | |
306 | return NULL; | |
307 | } | |
308 | EXPORT_SYMBOL_GPL(nvdimm_bus_register); | |
309 | ||
310 | void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus) | |
311 | { | |
312 | if (!nvdimm_bus) | |
313 | return; | |
314 | device_unregister(&nvdimm_bus->dev); | |
315 | } | |
316 | EXPORT_SYMBOL_GPL(nvdimm_bus_unregister); | |
317 | ||
318 | static int child_unregister(struct device *dev, void *data) | |
319 | { | |
320 | /* | |
321 | * the singular ndctl class device per bus needs to be | |
322 | * "device_destroy"ed, so skip it here | |
323 | * | |
324 | * i.e. remove classless children | |
325 | */ | |
326 | if (dev->class) | |
327 | /* pass */; | |
328 | else | |
329 | nd_device_unregister(dev, ND_SYNC); | |
330 | return 0; | |
331 | } | |
332 | ||
333 | static void free_poison_list(struct list_head *poison_list) | |
334 | { | |
335 | struct nd_poison *pl, *next; | |
336 | ||
337 | list_for_each_entry_safe(pl, next, poison_list, list) { | |
338 | list_del(&pl->list); | |
339 | kfree(pl); | |
340 | } | |
341 | list_del_init(poison_list); | |
342 | } | |
343 | ||
344 | static int nd_bus_remove(struct device *dev) | |
345 | { | |
346 | struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); | |
347 | ||
348 | mutex_lock(&nvdimm_bus_list_mutex); | |
349 | list_del_init(&nvdimm_bus->list); | |
350 | mutex_unlock(&nvdimm_bus_list_mutex); | |
351 | ||
352 | nd_synchronize(); | |
353 | device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister); | |
354 | ||
355 | nvdimm_bus_lock(&nvdimm_bus->dev); | |
356 | free_poison_list(&nvdimm_bus->poison_list); | |
357 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
358 | ||
359 | nvdimm_bus_destroy_ndctl(nvdimm_bus); | |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
364 | static int nd_bus_probe(struct device *dev) | |
365 | { | |
366 | struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); | |
367 | int rc; | |
368 | ||
369 | rc = nvdimm_bus_create_ndctl(nvdimm_bus); | |
370 | if (rc) | |
371 | return rc; | |
372 | ||
373 | mutex_lock(&nvdimm_bus_list_mutex); | |
374 | list_add_tail(&nvdimm_bus->list, &nvdimm_bus_list); | |
375 | mutex_unlock(&nvdimm_bus_list_mutex); | |
376 | ||
377 | /* enable bus provider attributes to look up their local context */ | |
378 | dev_set_drvdata(dev, nvdimm_bus->nd_desc); | |
379 | ||
380 | return 0; | |
381 | } | |
382 | ||
383 | static struct nd_device_driver nd_bus_driver = { | |
384 | .probe = nd_bus_probe, | |
385 | .remove = nd_bus_remove, | |
386 | .drv = { | |
387 | .name = "nd_bus", | |
388 | .suppress_bind_attrs = true, | |
389 | .bus = &nvdimm_bus_type, | |
390 | .owner = THIS_MODULE, | |
391 | .mod_name = KBUILD_MODNAME, | |
392 | }, | |
4d88a97a DW |
393 | }; |
394 | ||
18515942 DW |
395 | static int nvdimm_bus_match(struct device *dev, struct device_driver *drv) |
396 | { | |
397 | struct nd_device_driver *nd_drv = to_nd_device_driver(drv); | |
398 | ||
399 | if (is_nvdimm_bus(dev) && nd_drv == &nd_bus_driver) | |
400 | return true; | |
401 | ||
402 | return !!test_bit(to_nd_device_type(dev), &nd_drv->type); | |
403 | } | |
404 | ||
4d88a97a DW |
405 | static ASYNC_DOMAIN_EXCLUSIVE(nd_async_domain); |
406 | ||
407 | void nd_synchronize(void) | |
408 | { | |
409 | async_synchronize_full_domain(&nd_async_domain); | |
410 | } | |
411 | EXPORT_SYMBOL_GPL(nd_synchronize); | |
412 | ||
413 | static void nd_async_device_register(void *d, async_cookie_t cookie) | |
414 | { | |
415 | struct device *dev = d; | |
416 | ||
417 | if (device_add(dev) != 0) { | |
418 | dev_err(dev, "%s: failed\n", __func__); | |
419 | put_device(dev); | |
420 | } | |
421 | put_device(dev); | |
422 | } | |
423 | ||
424 | static void nd_async_device_unregister(void *d, async_cookie_t cookie) | |
425 | { | |
426 | struct device *dev = d; | |
427 | ||
0ba1c634 DW |
428 | /* flush bus operations before delete */ |
429 | nvdimm_bus_lock(dev); | |
430 | nvdimm_bus_unlock(dev); | |
431 | ||
4d88a97a DW |
432 | device_unregister(dev); |
433 | put_device(dev); | |
434 | } | |
435 | ||
8c2f7e86 | 436 | void __nd_device_register(struct device *dev) |
4d88a97a | 437 | { |
cd03412a DW |
438 | if (!dev) |
439 | return; | |
4d88a97a | 440 | dev->bus = &nvdimm_bus_type; |
4d88a97a DW |
441 | get_device(dev); |
442 | async_schedule_domain(nd_async_device_register, dev, | |
443 | &nd_async_domain); | |
444 | } | |
8c2f7e86 DW |
445 | |
446 | void nd_device_register(struct device *dev) | |
447 | { | |
448 | device_initialize(dev); | |
449 | __nd_device_register(dev); | |
450 | } | |
4d88a97a DW |
451 | EXPORT_SYMBOL(nd_device_register); |
452 | ||
453 | void nd_device_unregister(struct device *dev, enum nd_async_mode mode) | |
454 | { | |
455 | switch (mode) { | |
456 | case ND_ASYNC: | |
457 | get_device(dev); | |
458 | async_schedule_domain(nd_async_device_unregister, dev, | |
459 | &nd_async_domain); | |
460 | break; | |
461 | case ND_SYNC: | |
462 | nd_synchronize(); | |
463 | device_unregister(dev); | |
464 | break; | |
465 | } | |
466 | } | |
467 | EXPORT_SYMBOL(nd_device_unregister); | |
468 | ||
469 | /** | |
470 | * __nd_driver_register() - register a region or a namespace driver | |
471 | * @nd_drv: driver to register | |
472 | * @owner: automatically set by nd_driver_register() macro | |
473 | * @mod_name: automatically set by nd_driver_register() macro | |
474 | */ | |
475 | int __nd_driver_register(struct nd_device_driver *nd_drv, struct module *owner, | |
476 | const char *mod_name) | |
477 | { | |
478 | struct device_driver *drv = &nd_drv->drv; | |
479 | ||
480 | if (!nd_drv->type) { | |
481 | pr_debug("driver type bitmask not set (%pf)\n", | |
482 | __builtin_return_address(0)); | |
483 | return -EINVAL; | |
484 | } | |
485 | ||
6cf9c5ba DW |
486 | if (!nd_drv->probe) { |
487 | pr_debug("%s ->probe() must be specified\n", mod_name); | |
4d88a97a DW |
488 | return -EINVAL; |
489 | } | |
490 | ||
491 | drv->bus = &nvdimm_bus_type; | |
492 | drv->owner = owner; | |
493 | drv->mod_name = mod_name; | |
494 | ||
495 | return driver_register(drv); | |
496 | } | |
497 | EXPORT_SYMBOL(__nd_driver_register); | |
498 | ||
58138820 DW |
499 | int nvdimm_revalidate_disk(struct gendisk *disk) |
500 | { | |
52c44d93 | 501 | struct device *dev = disk_to_dev(disk)->parent; |
58138820 DW |
502 | struct nd_region *nd_region = to_nd_region(dev->parent); |
503 | const char *pol = nd_region->ro ? "only" : "write"; | |
504 | ||
505 | if (nd_region->ro == get_disk_ro(disk)) | |
506 | return 0; | |
507 | ||
508 | dev_info(dev, "%s read-%s, marking %s read-%s\n", | |
509 | dev_name(&nd_region->dev), pol, disk->disk_name, pol); | |
510 | set_disk_ro(disk, nd_region->ro); | |
511 | ||
512 | return 0; | |
513 | ||
514 | } | |
515 | EXPORT_SYMBOL(nvdimm_revalidate_disk); | |
516 | ||
4d88a97a DW |
517 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, |
518 | char *buf) | |
519 | { | |
520 | return sprintf(buf, ND_DEVICE_MODALIAS_FMT "\n", | |
521 | to_nd_device_type(dev)); | |
522 | } | |
523 | static DEVICE_ATTR_RO(modalias); | |
524 | ||
525 | static ssize_t devtype_show(struct device *dev, struct device_attribute *attr, | |
526 | char *buf) | |
527 | { | |
528 | return sprintf(buf, "%s\n", dev->type->name); | |
529 | } | |
530 | static DEVICE_ATTR_RO(devtype); | |
531 | ||
532 | static struct attribute *nd_device_attributes[] = { | |
533 | &dev_attr_modalias.attr, | |
534 | &dev_attr_devtype.attr, | |
535 | NULL, | |
536 | }; | |
537 | ||
538 | /** | |
539 | * nd_device_attribute_group - generic attributes for all devices on an nd bus | |
540 | */ | |
541 | struct attribute_group nd_device_attribute_group = { | |
542 | .attrs = nd_device_attributes, | |
e6dfb2de | 543 | }; |
4d88a97a | 544 | EXPORT_SYMBOL_GPL(nd_device_attribute_group); |
e6dfb2de | 545 | |
74ae66c3 TK |
546 | static ssize_t numa_node_show(struct device *dev, |
547 | struct device_attribute *attr, char *buf) | |
548 | { | |
549 | return sprintf(buf, "%d\n", dev_to_node(dev)); | |
550 | } | |
551 | static DEVICE_ATTR_RO(numa_node); | |
552 | ||
553 | static struct attribute *nd_numa_attributes[] = { | |
554 | &dev_attr_numa_node.attr, | |
555 | NULL, | |
556 | }; | |
557 | ||
558 | static umode_t nd_numa_attr_visible(struct kobject *kobj, struct attribute *a, | |
559 | int n) | |
560 | { | |
561 | if (!IS_ENABLED(CONFIG_NUMA)) | |
562 | return 0; | |
563 | ||
564 | return a->mode; | |
565 | } | |
566 | ||
567 | /** | |
568 | * nd_numa_attribute_group - NUMA attributes for all devices on an nd bus | |
569 | */ | |
570 | struct attribute_group nd_numa_attribute_group = { | |
571 | .attrs = nd_numa_attributes, | |
572 | .is_visible = nd_numa_attr_visible, | |
573 | }; | |
574 | EXPORT_SYMBOL_GPL(nd_numa_attribute_group); | |
575 | ||
45def22c DW |
576 | int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus) |
577 | { | |
578 | dev_t devt = MKDEV(nvdimm_bus_major, nvdimm_bus->id); | |
579 | struct device *dev; | |
580 | ||
581 | dev = device_create(nd_class, &nvdimm_bus->dev, devt, nvdimm_bus, | |
582 | "ndctl%d", nvdimm_bus->id); | |
583 | ||
42588958 | 584 | if (IS_ERR(dev)) |
45def22c DW |
585 | dev_dbg(&nvdimm_bus->dev, "failed to register ndctl%d: %ld\n", |
586 | nvdimm_bus->id, PTR_ERR(dev)); | |
42588958 | 587 | return PTR_ERR_OR_ZERO(dev); |
45def22c DW |
588 | } |
589 | ||
590 | void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus) | |
591 | { | |
592 | device_destroy(nd_class, MKDEV(nvdimm_bus_major, nvdimm_bus->id)); | |
593 | } | |
594 | ||
62232e45 DW |
595 | static const struct nd_cmd_desc __nd_cmd_dimm_descs[] = { |
596 | [ND_CMD_IMPLEMENTED] = { }, | |
597 | [ND_CMD_SMART] = { | |
598 | .out_num = 2, | |
21129112 | 599 | .out_sizes = { 4, 128, }, |
62232e45 DW |
600 | }, |
601 | [ND_CMD_SMART_THRESHOLD] = { | |
602 | .out_num = 2, | |
603 | .out_sizes = { 4, 8, }, | |
604 | }, | |
605 | [ND_CMD_DIMM_FLAGS] = { | |
606 | .out_num = 2, | |
607 | .out_sizes = { 4, 4 }, | |
608 | }, | |
609 | [ND_CMD_GET_CONFIG_SIZE] = { | |
610 | .out_num = 3, | |
611 | .out_sizes = { 4, 4, 4, }, | |
612 | }, | |
613 | [ND_CMD_GET_CONFIG_DATA] = { | |
614 | .in_num = 2, | |
615 | .in_sizes = { 4, 4, }, | |
616 | .out_num = 2, | |
617 | .out_sizes = { 4, UINT_MAX, }, | |
618 | }, | |
619 | [ND_CMD_SET_CONFIG_DATA] = { | |
620 | .in_num = 3, | |
621 | .in_sizes = { 4, 4, UINT_MAX, }, | |
622 | .out_num = 1, | |
623 | .out_sizes = { 4, }, | |
624 | }, | |
625 | [ND_CMD_VENDOR] = { | |
626 | .in_num = 3, | |
627 | .in_sizes = { 4, 4, UINT_MAX, }, | |
628 | .out_num = 3, | |
629 | .out_sizes = { 4, 4, UINT_MAX, }, | |
630 | }, | |
31eca76b DW |
631 | [ND_CMD_CALL] = { |
632 | .in_num = 2, | |
633 | .in_sizes = { sizeof(struct nd_cmd_pkg), UINT_MAX, }, | |
634 | .out_num = 1, | |
635 | .out_sizes = { UINT_MAX, }, | |
636 | }, | |
62232e45 DW |
637 | }; |
638 | ||
639 | const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd) | |
640 | { | |
641 | if (cmd < ARRAY_SIZE(__nd_cmd_dimm_descs)) | |
642 | return &__nd_cmd_dimm_descs[cmd]; | |
643 | return NULL; | |
644 | } | |
645 | EXPORT_SYMBOL_GPL(nd_cmd_dimm_desc); | |
646 | ||
647 | static const struct nd_cmd_desc __nd_cmd_bus_descs[] = { | |
648 | [ND_CMD_IMPLEMENTED] = { }, | |
649 | [ND_CMD_ARS_CAP] = { | |
650 | .in_num = 2, | |
651 | .in_sizes = { 8, 8, }, | |
4577b066 DW |
652 | .out_num = 4, |
653 | .out_sizes = { 4, 4, 4, 4, }, | |
62232e45 DW |
654 | }, |
655 | [ND_CMD_ARS_START] = { | |
4577b066 DW |
656 | .in_num = 5, |
657 | .in_sizes = { 8, 8, 2, 1, 5, }, | |
658 | .out_num = 2, | |
659 | .out_sizes = { 4, 4, }, | |
62232e45 DW |
660 | }, |
661 | [ND_CMD_ARS_STATUS] = { | |
747ffe11 DW |
662 | .out_num = 3, |
663 | .out_sizes = { 4, 4, UINT_MAX, }, | |
62232e45 | 664 | }, |
d4f32367 DW |
665 | [ND_CMD_CLEAR_ERROR] = { |
666 | .in_num = 2, | |
667 | .in_sizes = { 8, 8, }, | |
668 | .out_num = 3, | |
669 | .out_sizes = { 4, 4, 8, }, | |
670 | }, | |
31eca76b DW |
671 | [ND_CMD_CALL] = { |
672 | .in_num = 2, | |
673 | .in_sizes = { sizeof(struct nd_cmd_pkg), UINT_MAX, }, | |
674 | .out_num = 1, | |
675 | .out_sizes = { UINT_MAX, }, | |
676 | }, | |
62232e45 DW |
677 | }; |
678 | ||
679 | const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd) | |
680 | { | |
681 | if (cmd < ARRAY_SIZE(__nd_cmd_bus_descs)) | |
682 | return &__nd_cmd_bus_descs[cmd]; | |
683 | return NULL; | |
684 | } | |
685 | EXPORT_SYMBOL_GPL(nd_cmd_bus_desc); | |
686 | ||
687 | u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd, | |
688 | const struct nd_cmd_desc *desc, int idx, void *buf) | |
689 | { | |
690 | if (idx >= desc->in_num) | |
691 | return UINT_MAX; | |
692 | ||
693 | if (desc->in_sizes[idx] < UINT_MAX) | |
694 | return desc->in_sizes[idx]; | |
695 | ||
696 | if (nvdimm && cmd == ND_CMD_SET_CONFIG_DATA && idx == 2) { | |
697 | struct nd_cmd_set_config_hdr *hdr = buf; | |
698 | ||
699 | return hdr->in_length; | |
700 | } else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) { | |
701 | struct nd_cmd_vendor_hdr *hdr = buf; | |
702 | ||
703 | return hdr->in_length; | |
31eca76b DW |
704 | } else if (cmd == ND_CMD_CALL) { |
705 | struct nd_cmd_pkg *pkg = buf; | |
706 | ||
707 | return pkg->nd_size_in; | |
62232e45 DW |
708 | } |
709 | ||
710 | return UINT_MAX; | |
711 | } | |
712 | EXPORT_SYMBOL_GPL(nd_cmd_in_size); | |
713 | ||
714 | u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd, | |
715 | const struct nd_cmd_desc *desc, int idx, const u32 *in_field, | |
716 | const u32 *out_field) | |
717 | { | |
718 | if (idx >= desc->out_num) | |
719 | return UINT_MAX; | |
720 | ||
721 | if (desc->out_sizes[idx] < UINT_MAX) | |
722 | return desc->out_sizes[idx]; | |
723 | ||
724 | if (nvdimm && cmd == ND_CMD_GET_CONFIG_DATA && idx == 1) | |
725 | return in_field[1]; | |
726 | else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) | |
727 | return out_field[1]; | |
747ffe11 DW |
728 | else if (!nvdimm && cmd == ND_CMD_ARS_STATUS && idx == 2) |
729 | return out_field[1] - 8; | |
31eca76b DW |
730 | else if (cmd == ND_CMD_CALL) { |
731 | struct nd_cmd_pkg *pkg = (struct nd_cmd_pkg *) in_field; | |
732 | ||
733 | return pkg->nd_size_out; | |
734 | } | |
735 | ||
62232e45 DW |
736 | |
737 | return UINT_MAX; | |
738 | } | |
739 | EXPORT_SYMBOL_GPL(nd_cmd_out_size); | |
740 | ||
bf9bccc1 | 741 | void wait_nvdimm_bus_probe_idle(struct device *dev) |
eaf96153 | 742 | { |
bf9bccc1 DW |
743 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
744 | ||
eaf96153 DW |
745 | do { |
746 | if (nvdimm_bus->probe_active == 0) | |
747 | break; | |
748 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
749 | wait_event(nvdimm_bus->probe_wait, | |
750 | nvdimm_bus->probe_active == 0); | |
751 | nvdimm_bus_lock(&nvdimm_bus->dev); | |
752 | } while (true); | |
753 | } | |
754 | ||
d4f32367 DW |
755 | static int pmem_active(struct device *dev, void *data) |
756 | { | |
757 | if (is_nd_pmem(dev) && dev->driver) | |
758 | return -EBUSY; | |
759 | return 0; | |
760 | } | |
761 | ||
eaf96153 | 762 | /* set_config requires an idle interleave set */ |
87bf572e DW |
763 | static int nd_cmd_clear_to_send(struct nvdimm_bus *nvdimm_bus, |
764 | struct nvdimm *nvdimm, unsigned int cmd) | |
eaf96153 | 765 | { |
87bf572e DW |
766 | struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; |
767 | ||
768 | /* ask the bus provider if it would like to block this request */ | |
769 | if (nd_desc->clear_to_send) { | |
770 | int rc = nd_desc->clear_to_send(nd_desc, nvdimm, cmd); | |
771 | ||
772 | if (rc) | |
773 | return rc; | |
774 | } | |
eaf96153 | 775 | |
d4f32367 DW |
776 | /* require clear error to go through the pmem driver */ |
777 | if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR) | |
778 | return device_for_each_child(&nvdimm_bus->dev, NULL, | |
779 | pmem_active); | |
780 | ||
eaf96153 DW |
781 | if (!nvdimm || cmd != ND_CMD_SET_CONFIG_DATA) |
782 | return 0; | |
783 | ||
87bf572e | 784 | /* prevent label manipulation while the kernel owns label updates */ |
bf9bccc1 | 785 | wait_nvdimm_bus_probe_idle(&nvdimm_bus->dev); |
eaf96153 DW |
786 | if (atomic_read(&nvdimm->busy)) |
787 | return -EBUSY; | |
788 | return 0; | |
789 | } | |
790 | ||
62232e45 DW |
791 | static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm, |
792 | int read_only, unsigned int ioctl_cmd, unsigned long arg) | |
793 | { | |
794 | struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; | |
795 | size_t buf_len = 0, in_len = 0, out_len = 0; | |
796 | static char out_env[ND_CMD_MAX_ENVELOPE]; | |
797 | static char in_env[ND_CMD_MAX_ENVELOPE]; | |
798 | const struct nd_cmd_desc *desc = NULL; | |
799 | unsigned int cmd = _IOC_NR(ioctl_cmd); | |
800 | void __user *p = (void __user *) arg; | |
801 | struct device *dev = &nvdimm_bus->dev; | |
31eca76b | 802 | struct nd_cmd_pkg pkg; |
62232e45 | 803 | const char *cmd_name, *dimm_name; |
e3654eca | 804 | unsigned long cmd_mask; |
62232e45 DW |
805 | void *buf; |
806 | int rc, i; | |
807 | ||
808 | if (nvdimm) { | |
809 | desc = nd_cmd_dimm_desc(cmd); | |
810 | cmd_name = nvdimm_cmd_name(cmd); | |
e3654eca | 811 | cmd_mask = nvdimm->cmd_mask; |
62232e45 DW |
812 | dimm_name = dev_name(&nvdimm->dev); |
813 | } else { | |
814 | desc = nd_cmd_bus_desc(cmd); | |
815 | cmd_name = nvdimm_bus_cmd_name(cmd); | |
e3654eca | 816 | cmd_mask = nd_desc->cmd_mask; |
62232e45 DW |
817 | dimm_name = "bus"; |
818 | } | |
819 | ||
31eca76b DW |
820 | if (cmd == ND_CMD_CALL) { |
821 | if (copy_from_user(&pkg, p, sizeof(pkg))) | |
822 | return -EFAULT; | |
823 | } | |
824 | ||
62232e45 | 825 | if (!desc || (desc->out_num + desc->in_num == 0) || |
e3654eca | 826 | !test_bit(cmd, &cmd_mask)) |
62232e45 DW |
827 | return -ENOTTY; |
828 | ||
829 | /* fail write commands (when read-only) */ | |
830 | if (read_only) | |
07accfa9 JH |
831 | switch (cmd) { |
832 | case ND_CMD_VENDOR: | |
833 | case ND_CMD_SET_CONFIG_DATA: | |
834 | case ND_CMD_ARS_START: | |
d4f32367 | 835 | case ND_CMD_CLEAR_ERROR: |
31eca76b | 836 | case ND_CMD_CALL: |
62232e45 DW |
837 | dev_dbg(&nvdimm_bus->dev, "'%s' command while read-only.\n", |
838 | nvdimm ? nvdimm_cmd_name(cmd) | |
839 | : nvdimm_bus_cmd_name(cmd)); | |
840 | return -EPERM; | |
841 | default: | |
842 | break; | |
843 | } | |
844 | ||
845 | /* process an input envelope */ | |
846 | for (i = 0; i < desc->in_num; i++) { | |
847 | u32 in_size, copy; | |
848 | ||
849 | in_size = nd_cmd_in_size(nvdimm, cmd, desc, i, in_env); | |
850 | if (in_size == UINT_MAX) { | |
851 | dev_err(dev, "%s:%s unknown input size cmd: %s field: %d\n", | |
852 | __func__, dimm_name, cmd_name, i); | |
853 | return -ENXIO; | |
854 | } | |
62232e45 DW |
855 | if (in_len < sizeof(in_env)) |
856 | copy = min_t(u32, sizeof(in_env) - in_len, in_size); | |
857 | else | |
858 | copy = 0; | |
859 | if (copy && copy_from_user(&in_env[in_len], p + in_len, copy)) | |
860 | return -EFAULT; | |
861 | in_len += in_size; | |
862 | } | |
863 | ||
31eca76b DW |
864 | if (cmd == ND_CMD_CALL) { |
865 | dev_dbg(dev, "%s:%s, idx: %llu, in: %zu, out: %zu, len %zu\n", | |
866 | __func__, dimm_name, pkg.nd_command, | |
867 | in_len, out_len, buf_len); | |
868 | ||
869 | for (i = 0; i < ARRAY_SIZE(pkg.nd_reserved2); i++) | |
870 | if (pkg.nd_reserved2[i]) | |
871 | return -EINVAL; | |
872 | } | |
873 | ||
62232e45 DW |
874 | /* process an output envelope */ |
875 | for (i = 0; i < desc->out_num; i++) { | |
876 | u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i, | |
877 | (u32 *) in_env, (u32 *) out_env); | |
878 | u32 copy; | |
879 | ||
880 | if (out_size == UINT_MAX) { | |
881 | dev_dbg(dev, "%s:%s unknown output size cmd: %s field: %d\n", | |
882 | __func__, dimm_name, cmd_name, i); | |
883 | return -EFAULT; | |
884 | } | |
62232e45 DW |
885 | if (out_len < sizeof(out_env)) |
886 | copy = min_t(u32, sizeof(out_env) - out_len, out_size); | |
887 | else | |
888 | copy = 0; | |
889 | if (copy && copy_from_user(&out_env[out_len], | |
890 | p + in_len + out_len, copy)) | |
891 | return -EFAULT; | |
892 | out_len += out_size; | |
893 | } | |
894 | ||
895 | buf_len = out_len + in_len; | |
62232e45 DW |
896 | if (buf_len > ND_IOCTL_MAX_BUFLEN) { |
897 | dev_dbg(dev, "%s:%s cmd: %s buf_len: %zu > %d\n", __func__, | |
898 | dimm_name, cmd_name, buf_len, | |
899 | ND_IOCTL_MAX_BUFLEN); | |
900 | return -EINVAL; | |
901 | } | |
902 | ||
903 | buf = vmalloc(buf_len); | |
904 | if (!buf) | |
905 | return -ENOMEM; | |
906 | ||
907 | if (copy_from_user(buf, p, buf_len)) { | |
908 | rc = -EFAULT; | |
909 | goto out; | |
910 | } | |
911 | ||
eaf96153 | 912 | nvdimm_bus_lock(&nvdimm_bus->dev); |
87bf572e | 913 | rc = nd_cmd_clear_to_send(nvdimm_bus, nvdimm, cmd); |
eaf96153 DW |
914 | if (rc) |
915 | goto out_unlock; | |
916 | ||
aef25338 | 917 | rc = nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len, NULL); |
62232e45 | 918 | if (rc < 0) |
eaf96153 | 919 | goto out_unlock; |
62232e45 DW |
920 | if (copy_to_user(p, buf, buf_len)) |
921 | rc = -EFAULT; | |
eaf96153 DW |
922 | out_unlock: |
923 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
62232e45 DW |
924 | out: |
925 | vfree(buf); | |
926 | return rc; | |
927 | } | |
928 | ||
45def22c DW |
929 | static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
930 | { | |
62232e45 | 931 | long id = (long) file->private_data; |
4dc0e7be | 932 | int rc = -ENXIO, ro; |
62232e45 DW |
933 | struct nvdimm_bus *nvdimm_bus; |
934 | ||
4dc0e7be | 935 | ro = ((file->f_flags & O_ACCMODE) == O_RDONLY); |
62232e45 DW |
936 | mutex_lock(&nvdimm_bus_list_mutex); |
937 | list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) { | |
938 | if (nvdimm_bus->id == id) { | |
4dc0e7be | 939 | rc = __nd_ioctl(nvdimm_bus, NULL, ro, cmd, arg); |
62232e45 DW |
940 | break; |
941 | } | |
942 | } | |
943 | mutex_unlock(&nvdimm_bus_list_mutex); | |
944 | ||
945 | return rc; | |
946 | } | |
947 | ||
948 | static int match_dimm(struct device *dev, void *data) | |
949 | { | |
950 | long id = (long) data; | |
951 | ||
952 | if (is_nvdimm(dev)) { | |
953 | struct nvdimm *nvdimm = to_nvdimm(dev); | |
954 | ||
955 | return nvdimm->id == id; | |
956 | } | |
957 | ||
958 | return 0; | |
959 | } | |
960 | ||
961 | static long nvdimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
962 | { | |
4dc0e7be | 963 | int rc = -ENXIO, ro; |
62232e45 DW |
964 | struct nvdimm_bus *nvdimm_bus; |
965 | ||
4dc0e7be | 966 | ro = ((file->f_flags & O_ACCMODE) == O_RDONLY); |
62232e45 DW |
967 | mutex_lock(&nvdimm_bus_list_mutex); |
968 | list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) { | |
969 | struct device *dev = device_find_child(&nvdimm_bus->dev, | |
970 | file->private_data, match_dimm); | |
971 | struct nvdimm *nvdimm; | |
972 | ||
973 | if (!dev) | |
974 | continue; | |
975 | ||
976 | nvdimm = to_nvdimm(dev); | |
4dc0e7be | 977 | rc = __nd_ioctl(nvdimm_bus, nvdimm, ro, cmd, arg); |
62232e45 DW |
978 | put_device(dev); |
979 | break; | |
980 | } | |
981 | mutex_unlock(&nvdimm_bus_list_mutex); | |
982 | ||
983 | return rc; | |
984 | } | |
985 | ||
986 | static int nd_open(struct inode *inode, struct file *file) | |
987 | { | |
988 | long minor = iminor(inode); | |
989 | ||
990 | file->private_data = (void *) minor; | |
991 | return 0; | |
45def22c DW |
992 | } |
993 | ||
994 | static const struct file_operations nvdimm_bus_fops = { | |
995 | .owner = THIS_MODULE, | |
62232e45 | 996 | .open = nd_open, |
45def22c DW |
997 | .unlocked_ioctl = nd_ioctl, |
998 | .compat_ioctl = nd_ioctl, | |
999 | .llseek = noop_llseek, | |
1000 | }; | |
1001 | ||
62232e45 DW |
1002 | static const struct file_operations nvdimm_fops = { |
1003 | .owner = THIS_MODULE, | |
1004 | .open = nd_open, | |
1005 | .unlocked_ioctl = nvdimm_ioctl, | |
1006 | .compat_ioctl = nvdimm_ioctl, | |
1007 | .llseek = noop_llseek, | |
1008 | }; | |
1009 | ||
45def22c DW |
1010 | int __init nvdimm_bus_init(void) |
1011 | { | |
1012 | int rc; | |
1013 | ||
baa51277 DW |
1014 | BUILD_BUG_ON(sizeof(struct nd_smart_payload) != 128); |
1015 | BUILD_BUG_ON(sizeof(struct nd_smart_threshold_payload) != 8); | |
1016 | ||
e6dfb2de DW |
1017 | rc = bus_register(&nvdimm_bus_type); |
1018 | if (rc) | |
1019 | return rc; | |
1020 | ||
45def22c DW |
1021 | rc = register_chrdev(0, "ndctl", &nvdimm_bus_fops); |
1022 | if (rc < 0) | |
62232e45 | 1023 | goto err_bus_chrdev; |
45def22c DW |
1024 | nvdimm_bus_major = rc; |
1025 | ||
62232e45 DW |
1026 | rc = register_chrdev(0, "dimmctl", &nvdimm_fops); |
1027 | if (rc < 0) | |
1028 | goto err_dimm_chrdev; | |
1029 | nvdimm_major = rc; | |
1030 | ||
45def22c | 1031 | nd_class = class_create(THIS_MODULE, "nd"); |
daa1dee4 AL |
1032 | if (IS_ERR(nd_class)) { |
1033 | rc = PTR_ERR(nd_class); | |
45def22c | 1034 | goto err_class; |
daa1dee4 | 1035 | } |
45def22c | 1036 | |
18515942 DW |
1037 | rc = driver_register(&nd_bus_driver.drv); |
1038 | if (rc) | |
1039 | goto err_nd_bus; | |
1040 | ||
45def22c DW |
1041 | return 0; |
1042 | ||
18515942 DW |
1043 | err_nd_bus: |
1044 | class_destroy(nd_class); | |
45def22c | 1045 | err_class: |
62232e45 DW |
1046 | unregister_chrdev(nvdimm_major, "dimmctl"); |
1047 | err_dimm_chrdev: | |
45def22c | 1048 | unregister_chrdev(nvdimm_bus_major, "ndctl"); |
62232e45 | 1049 | err_bus_chrdev: |
e6dfb2de | 1050 | bus_unregister(&nvdimm_bus_type); |
45def22c DW |
1051 | |
1052 | return rc; | |
1053 | } | |
1054 | ||
4d88a97a | 1055 | void nvdimm_bus_exit(void) |
45def22c | 1056 | { |
18515942 | 1057 | driver_unregister(&nd_bus_driver.drv); |
45def22c DW |
1058 | class_destroy(nd_class); |
1059 | unregister_chrdev(nvdimm_bus_major, "ndctl"); | |
62232e45 | 1060 | unregister_chrdev(nvdimm_major, "dimmctl"); |
e6dfb2de | 1061 | bus_unregister(&nvdimm_bus_type); |
18515942 | 1062 | ida_destroy(&nd_ida); |
45def22c | 1063 | } |