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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" |
006358b3 | 30 | #include "pfn.h" |
45def22c | 31 | |
62232e45 | 32 | int nvdimm_major; |
45def22c DW |
33 | static int nvdimm_bus_major; |
34 | static struct class *nd_class; | |
18515942 | 35 | static DEFINE_IDA(nd_ida); |
45def22c | 36 | |
4d88a97a DW |
37 | static int to_nd_device_type(struct device *dev) |
38 | { | |
39 | if (is_nvdimm(dev)) | |
40 | return ND_DEVICE_DIMM; | |
3d88002e DW |
41 | else if (is_nd_pmem(dev)) |
42 | return ND_DEVICE_REGION_PMEM; | |
43 | else if (is_nd_blk(dev)) | |
44 | return ND_DEVICE_REGION_BLK; | |
cd03412a DW |
45 | else if (is_nd_dax(dev)) |
46 | return ND_DEVICE_DAX_PMEM; | |
3d88002e DW |
47 | else if (is_nd_pmem(dev->parent) || is_nd_blk(dev->parent)) |
48 | return nd_region_to_nstype(to_nd_region(dev->parent)); | |
4d88a97a DW |
49 | |
50 | return 0; | |
51 | } | |
52 | ||
53 | static int nvdimm_bus_uevent(struct device *dev, struct kobj_uevent_env *env) | |
54 | { | |
41d7a6d6 TK |
55 | /* |
56 | * Ensure that region devices always have their numa node set as | |
57 | * early as possible. | |
58 | */ | |
59 | if (is_nd_pmem(dev) || is_nd_blk(dev)) | |
60 | set_dev_node(dev, to_nd_region(dev)->numa_node); | |
4d88a97a DW |
61 | return add_uevent_var(env, "MODALIAS=" ND_DEVICE_MODALIAS_FMT, |
62 | to_nd_device_type(dev)); | |
63 | } | |
64 | ||
3d88002e DW |
65 | static struct module *to_bus_provider(struct device *dev) |
66 | { | |
67 | /* pin bus providers while regions are enabled */ | |
68 | if (is_nd_pmem(dev) || is_nd_blk(dev)) { | |
69 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
70 | ||
bc9775d8 | 71 | return nvdimm_bus->nd_desc->module; |
3d88002e DW |
72 | } |
73 | return NULL; | |
74 | } | |
75 | ||
eaf96153 DW |
76 | static void nvdimm_bus_probe_start(struct nvdimm_bus *nvdimm_bus) |
77 | { | |
78 | nvdimm_bus_lock(&nvdimm_bus->dev); | |
79 | nvdimm_bus->probe_active++; | |
80 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
81 | } | |
82 | ||
83 | static void nvdimm_bus_probe_end(struct nvdimm_bus *nvdimm_bus) | |
84 | { | |
85 | nvdimm_bus_lock(&nvdimm_bus->dev); | |
86 | if (--nvdimm_bus->probe_active == 0) | |
87 | wake_up(&nvdimm_bus->probe_wait); | |
88 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
89 | } | |
90 | ||
4d88a97a DW |
91 | static int nvdimm_bus_probe(struct device *dev) |
92 | { | |
93 | struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver); | |
3d88002e | 94 | struct module *provider = to_bus_provider(dev); |
4d88a97a DW |
95 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
96 | int rc; | |
97 | ||
3d88002e DW |
98 | if (!try_module_get(provider)) |
99 | return -ENXIO; | |
100 | ||
eaf96153 | 101 | nvdimm_bus_probe_start(nvdimm_bus); |
4d88a97a | 102 | rc = nd_drv->probe(dev); |
eaf96153 DW |
103 | if (rc == 0) |
104 | nd_region_probe_success(nvdimm_bus, dev); | |
bf9bccc1 DW |
105 | else |
106 | nd_region_disable(nvdimm_bus, dev); | |
eaf96153 DW |
107 | nvdimm_bus_probe_end(nvdimm_bus); |
108 | ||
4d88a97a DW |
109 | dev_dbg(&nvdimm_bus->dev, "%s.probe(%s) = %d\n", dev->driver->name, |
110 | dev_name(dev), rc); | |
8c2f7e86 | 111 | |
3d88002e DW |
112 | if (rc != 0) |
113 | module_put(provider); | |
4d88a97a DW |
114 | return rc; |
115 | } | |
116 | ||
117 | static int nvdimm_bus_remove(struct device *dev) | |
118 | { | |
119 | struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver); | |
3d88002e | 120 | struct module *provider = to_bus_provider(dev); |
4d88a97a | 121 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
6cf9c5ba | 122 | int rc = 0; |
4d88a97a | 123 | |
6cf9c5ba DW |
124 | if (nd_drv->remove) |
125 | rc = nd_drv->remove(dev); | |
eaf96153 DW |
126 | nd_region_disable(nvdimm_bus, dev); |
127 | ||
4d88a97a DW |
128 | dev_dbg(&nvdimm_bus->dev, "%s.remove(%s) = %d\n", dev->driver->name, |
129 | dev_name(dev), rc); | |
3d88002e | 130 | module_put(provider); |
4d88a97a DW |
131 | return rc; |
132 | } | |
133 | ||
476f848a DW |
134 | static void nvdimm_bus_shutdown(struct device *dev) |
135 | { | |
136 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
137 | struct nd_device_driver *nd_drv = NULL; | |
138 | ||
139 | if (dev->driver) | |
140 | nd_drv = to_nd_device_driver(dev->driver); | |
141 | ||
142 | if (nd_drv && nd_drv->shutdown) { | |
143 | nd_drv->shutdown(dev); | |
144 | dev_dbg(&nvdimm_bus->dev, "%s.shutdown(%s)\n", | |
145 | dev->driver->name, dev_name(dev)); | |
146 | } | |
147 | } | |
148 | ||
71999466 DW |
149 | void nd_device_notify(struct device *dev, enum nvdimm_event event) |
150 | { | |
151 | device_lock(dev); | |
152 | if (dev->driver) { | |
153 | struct nd_device_driver *nd_drv; | |
154 | ||
155 | nd_drv = to_nd_device_driver(dev->driver); | |
156 | if (nd_drv->notify) | |
157 | nd_drv->notify(dev, event); | |
158 | } | |
159 | device_unlock(dev); | |
160 | } | |
161 | EXPORT_SYMBOL(nd_device_notify); | |
162 | ||
163 | void nvdimm_region_notify(struct nd_region *nd_region, enum nvdimm_event event) | |
164 | { | |
165 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev); | |
166 | ||
167 | if (!nvdimm_bus) | |
168 | return; | |
169 | ||
170 | /* caller is responsible for holding a reference on the device */ | |
171 | nd_device_notify(&nd_region->dev, event); | |
172 | } | |
173 | EXPORT_SYMBOL_GPL(nvdimm_region_notify); | |
174 | ||
23f49844 DW |
175 | struct clear_badblocks_context { |
176 | resource_size_t phys, cleared; | |
177 | }; | |
178 | ||
179 | static int nvdimm_clear_badblocks_region(struct device *dev, void *data) | |
180 | { | |
181 | struct clear_badblocks_context *ctx = data; | |
182 | struct nd_region *nd_region; | |
183 | resource_size_t ndr_end; | |
184 | sector_t sector; | |
185 | ||
186 | /* make sure device is a region */ | |
187 | if (!is_nd_pmem(dev)) | |
188 | return 0; | |
189 | ||
190 | nd_region = to_nd_region(dev); | |
191 | ndr_end = nd_region->ndr_start + nd_region->ndr_size - 1; | |
192 | ||
193 | /* make sure we are in the region */ | |
194 | if (ctx->phys < nd_region->ndr_start | |
195 | || (ctx->phys + ctx->cleared) > ndr_end) | |
196 | return 0; | |
197 | ||
198 | sector = (ctx->phys - nd_region->ndr_start) / 512; | |
199 | badblocks_clear(&nd_region->bb, sector, ctx->cleared / 512); | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | static void nvdimm_clear_badblocks_regions(struct nvdimm_bus *nvdimm_bus, | |
205 | phys_addr_t phys, u64 cleared) | |
206 | { | |
207 | struct clear_badblocks_context ctx = { | |
208 | .phys = phys, | |
209 | .cleared = cleared, | |
210 | }; | |
211 | ||
212 | device_for_each_child(&nvdimm_bus->dev, &ctx, | |
213 | nvdimm_clear_badblocks_region); | |
214 | } | |
215 | ||
216 | static void nvdimm_account_cleared_poison(struct nvdimm_bus *nvdimm_bus, | |
217 | phys_addr_t phys, u64 cleared) | |
218 | { | |
219 | if (cleared > 0) | |
220 | nvdimm_forget_poison(nvdimm_bus, phys, cleared); | |
221 | ||
222 | if (cleared > 0 && cleared / 512) | |
223 | nvdimm_clear_badblocks_regions(nvdimm_bus, phys, cleared); | |
224 | } | |
225 | ||
59e64739 DW |
226 | long nvdimm_clear_poison(struct device *dev, phys_addr_t phys, |
227 | unsigned int len) | |
228 | { | |
229 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
230 | struct nvdimm_bus_descriptor *nd_desc; | |
231 | struct nd_cmd_clear_error clear_err; | |
232 | struct nd_cmd_ars_cap ars_cap; | |
233 | u32 clear_err_unit, mask; | |
234 | int cmd_rc, rc; | |
235 | ||
236 | if (!nvdimm_bus) | |
237 | return -ENXIO; | |
238 | ||
239 | nd_desc = nvdimm_bus->nd_desc; | |
1e8b8d96 DJ |
240 | /* |
241 | * if ndctl does not exist, it's PMEM_LEGACY and | |
242 | * we want to just pretend everything is handled. | |
243 | */ | |
59e64739 | 244 | if (!nd_desc->ndctl) |
1e8b8d96 | 245 | return len; |
59e64739 DW |
246 | |
247 | memset(&ars_cap, 0, sizeof(ars_cap)); | |
248 | ars_cap.address = phys; | |
249 | ars_cap.length = len; | |
250 | rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, &ars_cap, | |
251 | sizeof(ars_cap), &cmd_rc); | |
252 | if (rc < 0) | |
253 | return rc; | |
254 | if (cmd_rc < 0) | |
255 | return cmd_rc; | |
256 | clear_err_unit = ars_cap.clear_err_unit; | |
257 | if (!clear_err_unit || !is_power_of_2(clear_err_unit)) | |
258 | return -ENXIO; | |
259 | ||
260 | mask = clear_err_unit - 1; | |
261 | if ((phys | len) & mask) | |
262 | return -ENXIO; | |
263 | memset(&clear_err, 0, sizeof(clear_err)); | |
264 | clear_err.address = phys; | |
265 | clear_err.length = len; | |
266 | rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_CLEAR_ERROR, &clear_err, | |
267 | sizeof(clear_err), &cmd_rc); | |
268 | if (rc < 0) | |
269 | return rc; | |
270 | if (cmd_rc < 0) | |
271 | return cmd_rc; | |
e046114a | 272 | |
23f49844 | 273 | nvdimm_account_cleared_poison(nvdimm_bus, phys, clear_err.cleared); |
8d13c029 | 274 | |
59e64739 DW |
275 | return clear_err.cleared; |
276 | } | |
277 | EXPORT_SYMBOL_GPL(nvdimm_clear_poison); | |
278 | ||
18515942 DW |
279 | static int nvdimm_bus_match(struct device *dev, struct device_driver *drv); |
280 | ||
4d88a97a | 281 | static struct bus_type nvdimm_bus_type = { |
e6dfb2de | 282 | .name = "nd", |
4d88a97a DW |
283 | .uevent = nvdimm_bus_uevent, |
284 | .match = nvdimm_bus_match, | |
285 | .probe = nvdimm_bus_probe, | |
286 | .remove = nvdimm_bus_remove, | |
476f848a | 287 | .shutdown = nvdimm_bus_shutdown, |
4d88a97a DW |
288 | }; |
289 | ||
18515942 DW |
290 | static void nvdimm_bus_release(struct device *dev) |
291 | { | |
292 | struct nvdimm_bus *nvdimm_bus; | |
293 | ||
294 | nvdimm_bus = container_of(dev, struct nvdimm_bus, dev); | |
295 | ida_simple_remove(&nd_ida, nvdimm_bus->id); | |
296 | kfree(nvdimm_bus); | |
297 | } | |
298 | ||
299 | static bool is_nvdimm_bus(struct device *dev) | |
300 | { | |
301 | return dev->release == nvdimm_bus_release; | |
302 | } | |
303 | ||
304 | struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev) | |
305 | { | |
306 | struct device *dev; | |
307 | ||
308 | for (dev = nd_dev; dev; dev = dev->parent) | |
309 | if (is_nvdimm_bus(dev)) | |
310 | break; | |
311 | dev_WARN_ONCE(nd_dev, !dev, "invalid dev, not on nd bus\n"); | |
312 | if (dev) | |
313 | return to_nvdimm_bus(dev); | |
314 | return NULL; | |
315 | } | |
316 | ||
317 | struct nvdimm_bus *to_nvdimm_bus(struct device *dev) | |
318 | { | |
319 | struct nvdimm_bus *nvdimm_bus; | |
320 | ||
321 | nvdimm_bus = container_of(dev, struct nvdimm_bus, dev); | |
322 | WARN_ON(!is_nvdimm_bus(dev)); | |
323 | return nvdimm_bus; | |
324 | } | |
325 | EXPORT_SYMBOL_GPL(to_nvdimm_bus); | |
326 | ||
327 | struct nvdimm_bus *nvdimm_bus_register(struct device *parent, | |
328 | struct nvdimm_bus_descriptor *nd_desc) | |
329 | { | |
330 | struct nvdimm_bus *nvdimm_bus; | |
331 | int rc; | |
332 | ||
333 | nvdimm_bus = kzalloc(sizeof(*nvdimm_bus), GFP_KERNEL); | |
334 | if (!nvdimm_bus) | |
335 | return NULL; | |
336 | INIT_LIST_HEAD(&nvdimm_bus->list); | |
337 | INIT_LIST_HEAD(&nvdimm_bus->mapping_list); | |
338 | INIT_LIST_HEAD(&nvdimm_bus->poison_list); | |
339 | init_waitqueue_head(&nvdimm_bus->probe_wait); | |
340 | nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL); | |
341 | mutex_init(&nvdimm_bus->reconfig_mutex); | |
b3b454f6 | 342 | spin_lock_init(&nvdimm_bus->poison_lock); |
18515942 DW |
343 | if (nvdimm_bus->id < 0) { |
344 | kfree(nvdimm_bus); | |
345 | return NULL; | |
346 | } | |
347 | nvdimm_bus->nd_desc = nd_desc; | |
348 | nvdimm_bus->dev.parent = parent; | |
349 | nvdimm_bus->dev.release = nvdimm_bus_release; | |
350 | nvdimm_bus->dev.groups = nd_desc->attr_groups; | |
351 | nvdimm_bus->dev.bus = &nvdimm_bus_type; | |
352 | dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id); | |
353 | rc = device_register(&nvdimm_bus->dev); | |
354 | if (rc) { | |
355 | dev_dbg(&nvdimm_bus->dev, "registration failed: %d\n", rc); | |
356 | goto err; | |
357 | } | |
358 | ||
359 | return nvdimm_bus; | |
360 | err: | |
361 | put_device(&nvdimm_bus->dev); | |
362 | return NULL; | |
363 | } | |
364 | EXPORT_SYMBOL_GPL(nvdimm_bus_register); | |
365 | ||
366 | void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus) | |
367 | { | |
368 | if (!nvdimm_bus) | |
369 | return; | |
370 | device_unregister(&nvdimm_bus->dev); | |
371 | } | |
372 | EXPORT_SYMBOL_GPL(nvdimm_bus_unregister); | |
373 | ||
374 | static int child_unregister(struct device *dev, void *data) | |
375 | { | |
376 | /* | |
377 | * the singular ndctl class device per bus needs to be | |
378 | * "device_destroy"ed, so skip it here | |
379 | * | |
380 | * i.e. remove classless children | |
381 | */ | |
382 | if (dev->class) | |
383 | /* pass */; | |
384 | else | |
385 | nd_device_unregister(dev, ND_SYNC); | |
386 | return 0; | |
387 | } | |
388 | ||
389 | static void free_poison_list(struct list_head *poison_list) | |
390 | { | |
391 | struct nd_poison *pl, *next; | |
392 | ||
393 | list_for_each_entry_safe(pl, next, poison_list, list) { | |
394 | list_del(&pl->list); | |
395 | kfree(pl); | |
396 | } | |
397 | list_del_init(poison_list); | |
398 | } | |
399 | ||
400 | static int nd_bus_remove(struct device *dev) | |
401 | { | |
402 | struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); | |
403 | ||
404 | mutex_lock(&nvdimm_bus_list_mutex); | |
405 | list_del_init(&nvdimm_bus->list); | |
406 | mutex_unlock(&nvdimm_bus_list_mutex); | |
407 | ||
408 | nd_synchronize(); | |
409 | device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister); | |
410 | ||
b3b454f6 | 411 | spin_lock(&nvdimm_bus->poison_lock); |
18515942 | 412 | free_poison_list(&nvdimm_bus->poison_list); |
b3b454f6 | 413 | spin_unlock(&nvdimm_bus->poison_lock); |
18515942 DW |
414 | |
415 | nvdimm_bus_destroy_ndctl(nvdimm_bus); | |
416 | ||
417 | return 0; | |
418 | } | |
419 | ||
420 | static int nd_bus_probe(struct device *dev) | |
421 | { | |
422 | struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); | |
423 | int rc; | |
424 | ||
425 | rc = nvdimm_bus_create_ndctl(nvdimm_bus); | |
426 | if (rc) | |
427 | return rc; | |
428 | ||
429 | mutex_lock(&nvdimm_bus_list_mutex); | |
430 | list_add_tail(&nvdimm_bus->list, &nvdimm_bus_list); | |
431 | mutex_unlock(&nvdimm_bus_list_mutex); | |
432 | ||
433 | /* enable bus provider attributes to look up their local context */ | |
434 | dev_set_drvdata(dev, nvdimm_bus->nd_desc); | |
435 | ||
436 | return 0; | |
437 | } | |
438 | ||
439 | static struct nd_device_driver nd_bus_driver = { | |
440 | .probe = nd_bus_probe, | |
441 | .remove = nd_bus_remove, | |
442 | .drv = { | |
443 | .name = "nd_bus", | |
444 | .suppress_bind_attrs = true, | |
445 | .bus = &nvdimm_bus_type, | |
446 | .owner = THIS_MODULE, | |
447 | .mod_name = KBUILD_MODNAME, | |
448 | }, | |
4d88a97a DW |
449 | }; |
450 | ||
18515942 DW |
451 | static int nvdimm_bus_match(struct device *dev, struct device_driver *drv) |
452 | { | |
453 | struct nd_device_driver *nd_drv = to_nd_device_driver(drv); | |
454 | ||
455 | if (is_nvdimm_bus(dev) && nd_drv == &nd_bus_driver) | |
456 | return true; | |
457 | ||
458 | return !!test_bit(to_nd_device_type(dev), &nd_drv->type); | |
459 | } | |
460 | ||
4d88a97a DW |
461 | static ASYNC_DOMAIN_EXCLUSIVE(nd_async_domain); |
462 | ||
463 | void nd_synchronize(void) | |
464 | { | |
465 | async_synchronize_full_domain(&nd_async_domain); | |
466 | } | |
467 | EXPORT_SYMBOL_GPL(nd_synchronize); | |
468 | ||
469 | static void nd_async_device_register(void *d, async_cookie_t cookie) | |
470 | { | |
471 | struct device *dev = d; | |
472 | ||
473 | if (device_add(dev) != 0) { | |
474 | dev_err(dev, "%s: failed\n", __func__); | |
475 | put_device(dev); | |
476 | } | |
477 | put_device(dev); | |
478 | } | |
479 | ||
480 | static void nd_async_device_unregister(void *d, async_cookie_t cookie) | |
481 | { | |
482 | struct device *dev = d; | |
483 | ||
0ba1c634 DW |
484 | /* flush bus operations before delete */ |
485 | nvdimm_bus_lock(dev); | |
486 | nvdimm_bus_unlock(dev); | |
487 | ||
4d88a97a DW |
488 | device_unregister(dev); |
489 | put_device(dev); | |
490 | } | |
491 | ||
8c2f7e86 | 492 | void __nd_device_register(struct device *dev) |
4d88a97a | 493 | { |
cd03412a DW |
494 | if (!dev) |
495 | return; | |
4d88a97a | 496 | dev->bus = &nvdimm_bus_type; |
4d88a97a DW |
497 | get_device(dev); |
498 | async_schedule_domain(nd_async_device_register, dev, | |
499 | &nd_async_domain); | |
500 | } | |
8c2f7e86 DW |
501 | |
502 | void nd_device_register(struct device *dev) | |
503 | { | |
504 | device_initialize(dev); | |
505 | __nd_device_register(dev); | |
506 | } | |
4d88a97a DW |
507 | EXPORT_SYMBOL(nd_device_register); |
508 | ||
509 | void nd_device_unregister(struct device *dev, enum nd_async_mode mode) | |
510 | { | |
511 | switch (mode) { | |
512 | case ND_ASYNC: | |
513 | get_device(dev); | |
514 | async_schedule_domain(nd_async_device_unregister, dev, | |
515 | &nd_async_domain); | |
516 | break; | |
517 | case ND_SYNC: | |
518 | nd_synchronize(); | |
519 | device_unregister(dev); | |
520 | break; | |
521 | } | |
522 | } | |
523 | EXPORT_SYMBOL(nd_device_unregister); | |
524 | ||
525 | /** | |
526 | * __nd_driver_register() - register a region or a namespace driver | |
527 | * @nd_drv: driver to register | |
528 | * @owner: automatically set by nd_driver_register() macro | |
529 | * @mod_name: automatically set by nd_driver_register() macro | |
530 | */ | |
531 | int __nd_driver_register(struct nd_device_driver *nd_drv, struct module *owner, | |
532 | const char *mod_name) | |
533 | { | |
534 | struct device_driver *drv = &nd_drv->drv; | |
535 | ||
536 | if (!nd_drv->type) { | |
537 | pr_debug("driver type bitmask not set (%pf)\n", | |
538 | __builtin_return_address(0)); | |
539 | return -EINVAL; | |
540 | } | |
541 | ||
6cf9c5ba DW |
542 | if (!nd_drv->probe) { |
543 | pr_debug("%s ->probe() must be specified\n", mod_name); | |
4d88a97a DW |
544 | return -EINVAL; |
545 | } | |
546 | ||
547 | drv->bus = &nvdimm_bus_type; | |
548 | drv->owner = owner; | |
549 | drv->mod_name = mod_name; | |
550 | ||
551 | return driver_register(drv); | |
552 | } | |
553 | EXPORT_SYMBOL(__nd_driver_register); | |
554 | ||
58138820 DW |
555 | int nvdimm_revalidate_disk(struct gendisk *disk) |
556 | { | |
52c44d93 | 557 | struct device *dev = disk_to_dev(disk)->parent; |
58138820 DW |
558 | struct nd_region *nd_region = to_nd_region(dev->parent); |
559 | const char *pol = nd_region->ro ? "only" : "write"; | |
560 | ||
561 | if (nd_region->ro == get_disk_ro(disk)) | |
562 | return 0; | |
563 | ||
564 | dev_info(dev, "%s read-%s, marking %s read-%s\n", | |
565 | dev_name(&nd_region->dev), pol, disk->disk_name, pol); | |
566 | set_disk_ro(disk, nd_region->ro); | |
567 | ||
568 | return 0; | |
569 | ||
570 | } | |
571 | EXPORT_SYMBOL(nvdimm_revalidate_disk); | |
572 | ||
4d88a97a DW |
573 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, |
574 | char *buf) | |
575 | { | |
576 | return sprintf(buf, ND_DEVICE_MODALIAS_FMT "\n", | |
577 | to_nd_device_type(dev)); | |
578 | } | |
579 | static DEVICE_ATTR_RO(modalias); | |
580 | ||
581 | static ssize_t devtype_show(struct device *dev, struct device_attribute *attr, | |
582 | char *buf) | |
583 | { | |
584 | return sprintf(buf, "%s\n", dev->type->name); | |
585 | } | |
586 | static DEVICE_ATTR_RO(devtype); | |
587 | ||
588 | static struct attribute *nd_device_attributes[] = { | |
589 | &dev_attr_modalias.attr, | |
590 | &dev_attr_devtype.attr, | |
591 | NULL, | |
592 | }; | |
593 | ||
594 | /** | |
595 | * nd_device_attribute_group - generic attributes for all devices on an nd bus | |
596 | */ | |
597 | struct attribute_group nd_device_attribute_group = { | |
598 | .attrs = nd_device_attributes, | |
e6dfb2de | 599 | }; |
4d88a97a | 600 | EXPORT_SYMBOL_GPL(nd_device_attribute_group); |
e6dfb2de | 601 | |
74ae66c3 TK |
602 | static ssize_t numa_node_show(struct device *dev, |
603 | struct device_attribute *attr, char *buf) | |
604 | { | |
605 | return sprintf(buf, "%d\n", dev_to_node(dev)); | |
606 | } | |
607 | static DEVICE_ATTR_RO(numa_node); | |
608 | ||
609 | static struct attribute *nd_numa_attributes[] = { | |
610 | &dev_attr_numa_node.attr, | |
611 | NULL, | |
612 | }; | |
613 | ||
614 | static umode_t nd_numa_attr_visible(struct kobject *kobj, struct attribute *a, | |
615 | int n) | |
616 | { | |
617 | if (!IS_ENABLED(CONFIG_NUMA)) | |
618 | return 0; | |
619 | ||
620 | return a->mode; | |
621 | } | |
622 | ||
623 | /** | |
624 | * nd_numa_attribute_group - NUMA attributes for all devices on an nd bus | |
625 | */ | |
626 | struct attribute_group nd_numa_attribute_group = { | |
627 | .attrs = nd_numa_attributes, | |
628 | .is_visible = nd_numa_attr_visible, | |
629 | }; | |
630 | EXPORT_SYMBOL_GPL(nd_numa_attribute_group); | |
631 | ||
45def22c DW |
632 | int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus) |
633 | { | |
634 | dev_t devt = MKDEV(nvdimm_bus_major, nvdimm_bus->id); | |
635 | struct device *dev; | |
636 | ||
637 | dev = device_create(nd_class, &nvdimm_bus->dev, devt, nvdimm_bus, | |
638 | "ndctl%d", nvdimm_bus->id); | |
639 | ||
42588958 | 640 | if (IS_ERR(dev)) |
45def22c DW |
641 | dev_dbg(&nvdimm_bus->dev, "failed to register ndctl%d: %ld\n", |
642 | nvdimm_bus->id, PTR_ERR(dev)); | |
42588958 | 643 | return PTR_ERR_OR_ZERO(dev); |
45def22c DW |
644 | } |
645 | ||
646 | void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus) | |
647 | { | |
648 | device_destroy(nd_class, MKDEV(nvdimm_bus_major, nvdimm_bus->id)); | |
649 | } | |
650 | ||
62232e45 DW |
651 | static const struct nd_cmd_desc __nd_cmd_dimm_descs[] = { |
652 | [ND_CMD_IMPLEMENTED] = { }, | |
653 | [ND_CMD_SMART] = { | |
654 | .out_num = 2, | |
21129112 | 655 | .out_sizes = { 4, 128, }, |
62232e45 DW |
656 | }, |
657 | [ND_CMD_SMART_THRESHOLD] = { | |
658 | .out_num = 2, | |
659 | .out_sizes = { 4, 8, }, | |
660 | }, | |
661 | [ND_CMD_DIMM_FLAGS] = { | |
662 | .out_num = 2, | |
663 | .out_sizes = { 4, 4 }, | |
664 | }, | |
665 | [ND_CMD_GET_CONFIG_SIZE] = { | |
666 | .out_num = 3, | |
667 | .out_sizes = { 4, 4, 4, }, | |
668 | }, | |
669 | [ND_CMD_GET_CONFIG_DATA] = { | |
670 | .in_num = 2, | |
671 | .in_sizes = { 4, 4, }, | |
672 | .out_num = 2, | |
673 | .out_sizes = { 4, UINT_MAX, }, | |
674 | }, | |
675 | [ND_CMD_SET_CONFIG_DATA] = { | |
676 | .in_num = 3, | |
677 | .in_sizes = { 4, 4, UINT_MAX, }, | |
678 | .out_num = 1, | |
679 | .out_sizes = { 4, }, | |
680 | }, | |
681 | [ND_CMD_VENDOR] = { | |
682 | .in_num = 3, | |
683 | .in_sizes = { 4, 4, UINT_MAX, }, | |
684 | .out_num = 3, | |
685 | .out_sizes = { 4, 4, UINT_MAX, }, | |
686 | }, | |
31eca76b DW |
687 | [ND_CMD_CALL] = { |
688 | .in_num = 2, | |
689 | .in_sizes = { sizeof(struct nd_cmd_pkg), UINT_MAX, }, | |
690 | .out_num = 1, | |
691 | .out_sizes = { UINT_MAX, }, | |
692 | }, | |
62232e45 DW |
693 | }; |
694 | ||
695 | const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd) | |
696 | { | |
697 | if (cmd < ARRAY_SIZE(__nd_cmd_dimm_descs)) | |
698 | return &__nd_cmd_dimm_descs[cmd]; | |
699 | return NULL; | |
700 | } | |
701 | EXPORT_SYMBOL_GPL(nd_cmd_dimm_desc); | |
702 | ||
703 | static const struct nd_cmd_desc __nd_cmd_bus_descs[] = { | |
704 | [ND_CMD_IMPLEMENTED] = { }, | |
705 | [ND_CMD_ARS_CAP] = { | |
706 | .in_num = 2, | |
707 | .in_sizes = { 8, 8, }, | |
4577b066 DW |
708 | .out_num = 4, |
709 | .out_sizes = { 4, 4, 4, 4, }, | |
62232e45 DW |
710 | }, |
711 | [ND_CMD_ARS_START] = { | |
4577b066 DW |
712 | .in_num = 5, |
713 | .in_sizes = { 8, 8, 2, 1, 5, }, | |
714 | .out_num = 2, | |
715 | .out_sizes = { 4, 4, }, | |
62232e45 DW |
716 | }, |
717 | [ND_CMD_ARS_STATUS] = { | |
747ffe11 DW |
718 | .out_num = 3, |
719 | .out_sizes = { 4, 4, UINT_MAX, }, | |
62232e45 | 720 | }, |
d4f32367 DW |
721 | [ND_CMD_CLEAR_ERROR] = { |
722 | .in_num = 2, | |
723 | .in_sizes = { 8, 8, }, | |
724 | .out_num = 3, | |
725 | .out_sizes = { 4, 4, 8, }, | |
726 | }, | |
31eca76b DW |
727 | [ND_CMD_CALL] = { |
728 | .in_num = 2, | |
729 | .in_sizes = { sizeof(struct nd_cmd_pkg), UINT_MAX, }, | |
730 | .out_num = 1, | |
731 | .out_sizes = { UINT_MAX, }, | |
732 | }, | |
62232e45 DW |
733 | }; |
734 | ||
735 | const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd) | |
736 | { | |
737 | if (cmd < ARRAY_SIZE(__nd_cmd_bus_descs)) | |
738 | return &__nd_cmd_bus_descs[cmd]; | |
739 | return NULL; | |
740 | } | |
741 | EXPORT_SYMBOL_GPL(nd_cmd_bus_desc); | |
742 | ||
743 | u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd, | |
744 | const struct nd_cmd_desc *desc, int idx, void *buf) | |
745 | { | |
746 | if (idx >= desc->in_num) | |
747 | return UINT_MAX; | |
748 | ||
749 | if (desc->in_sizes[idx] < UINT_MAX) | |
750 | return desc->in_sizes[idx]; | |
751 | ||
752 | if (nvdimm && cmd == ND_CMD_SET_CONFIG_DATA && idx == 2) { | |
753 | struct nd_cmd_set_config_hdr *hdr = buf; | |
754 | ||
755 | return hdr->in_length; | |
756 | } else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) { | |
757 | struct nd_cmd_vendor_hdr *hdr = buf; | |
758 | ||
759 | return hdr->in_length; | |
31eca76b DW |
760 | } else if (cmd == ND_CMD_CALL) { |
761 | struct nd_cmd_pkg *pkg = buf; | |
762 | ||
763 | return pkg->nd_size_in; | |
62232e45 DW |
764 | } |
765 | ||
766 | return UINT_MAX; | |
767 | } | |
768 | EXPORT_SYMBOL_GPL(nd_cmd_in_size); | |
769 | ||
770 | u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd, | |
771 | const struct nd_cmd_desc *desc, int idx, const u32 *in_field, | |
efda1b5d | 772 | const u32 *out_field, unsigned long remainder) |
62232e45 DW |
773 | { |
774 | if (idx >= desc->out_num) | |
775 | return UINT_MAX; | |
776 | ||
777 | if (desc->out_sizes[idx] < UINT_MAX) | |
778 | return desc->out_sizes[idx]; | |
779 | ||
780 | if (nvdimm && cmd == ND_CMD_GET_CONFIG_DATA && idx == 1) | |
781 | return in_field[1]; | |
782 | else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) | |
783 | return out_field[1]; | |
efda1b5d DW |
784 | else if (!nvdimm && cmd == ND_CMD_ARS_STATUS && idx == 2) { |
785 | /* | |
786 | * Per table 9-276 ARS Data in ACPI 6.1, out_field[1] is | |
787 | * "Size of Output Buffer in bytes, including this | |
788 | * field." | |
789 | */ | |
790 | if (out_field[1] < 4) | |
791 | return 0; | |
792 | /* | |
793 | * ACPI 6.1 is ambiguous if 'status' is included in the | |
794 | * output size. If we encounter an output size that | |
795 | * overshoots the remainder by 4 bytes, assume it was | |
796 | * including 'status'. | |
797 | */ | |
798 | if (out_field[1] - 8 == remainder) | |
799 | return remainder; | |
800 | return out_field[1] - 4; | |
801 | } else if (cmd == ND_CMD_CALL) { | |
31eca76b DW |
802 | struct nd_cmd_pkg *pkg = (struct nd_cmd_pkg *) in_field; |
803 | ||
804 | return pkg->nd_size_out; | |
805 | } | |
806 | ||
62232e45 DW |
807 | |
808 | return UINT_MAX; | |
809 | } | |
810 | EXPORT_SYMBOL_GPL(nd_cmd_out_size); | |
811 | ||
bf9bccc1 | 812 | void wait_nvdimm_bus_probe_idle(struct device *dev) |
eaf96153 | 813 | { |
bf9bccc1 DW |
814 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
815 | ||
eaf96153 DW |
816 | do { |
817 | if (nvdimm_bus->probe_active == 0) | |
818 | break; | |
819 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
820 | wait_event(nvdimm_bus->probe_wait, | |
821 | nvdimm_bus->probe_active == 0); | |
822 | nvdimm_bus_lock(&nvdimm_bus->dev); | |
823 | } while (true); | |
824 | } | |
825 | ||
006358b3 | 826 | static int nd_pmem_forget_poison_check(struct device *dev, void *data) |
d4f32367 | 827 | { |
006358b3 DJ |
828 | struct nd_cmd_clear_error *clear_err = |
829 | (struct nd_cmd_clear_error *)data; | |
830 | struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL; | |
831 | struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL; | |
832 | struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL; | |
833 | struct nd_namespace_common *ndns = NULL; | |
834 | struct nd_namespace_io *nsio; | |
835 | resource_size_t offset = 0, end_trunc = 0, start, end, pstart, pend; | |
836 | ||
837 | if (nd_dax || !dev->driver) | |
838 | return 0; | |
839 | ||
840 | start = clear_err->address; | |
841 | end = clear_err->address + clear_err->cleared - 1; | |
842 | ||
843 | if (nd_btt || nd_pfn || nd_dax) { | |
844 | if (nd_btt) | |
845 | ndns = nd_btt->ndns; | |
846 | else if (nd_pfn) | |
847 | ndns = nd_pfn->ndns; | |
848 | else if (nd_dax) | |
849 | ndns = nd_dax->nd_pfn.ndns; | |
850 | ||
851 | if (!ndns) | |
852 | return 0; | |
853 | } else | |
854 | ndns = to_ndns(dev); | |
855 | ||
856 | nsio = to_nd_namespace_io(&ndns->dev); | |
857 | pstart = nsio->res.start + offset; | |
858 | pend = nsio->res.end - end_trunc; | |
859 | ||
860 | if ((pstart >= start) && (pend <= end)) | |
d4f32367 | 861 | return -EBUSY; |
006358b3 | 862 | |
d4f32367 | 863 | return 0; |
006358b3 DJ |
864 | |
865 | } | |
866 | ||
867 | static int nd_ns_forget_poison_check(struct device *dev, void *data) | |
868 | { | |
869 | return device_for_each_child(dev, data, nd_pmem_forget_poison_check); | |
d4f32367 DW |
870 | } |
871 | ||
eaf96153 | 872 | /* set_config requires an idle interleave set */ |
87bf572e | 873 | static int nd_cmd_clear_to_send(struct nvdimm_bus *nvdimm_bus, |
006358b3 | 874 | struct nvdimm *nvdimm, unsigned int cmd, void *data) |
eaf96153 | 875 | { |
87bf572e DW |
876 | struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; |
877 | ||
878 | /* ask the bus provider if it would like to block this request */ | |
879 | if (nd_desc->clear_to_send) { | |
880 | int rc = nd_desc->clear_to_send(nd_desc, nvdimm, cmd); | |
881 | ||
882 | if (rc) | |
883 | return rc; | |
884 | } | |
eaf96153 | 885 | |
d4f32367 DW |
886 | /* require clear error to go through the pmem driver */ |
887 | if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR) | |
006358b3 DJ |
888 | return device_for_each_child(&nvdimm_bus->dev, data, |
889 | nd_ns_forget_poison_check); | |
d4f32367 | 890 | |
eaf96153 DW |
891 | if (!nvdimm || cmd != ND_CMD_SET_CONFIG_DATA) |
892 | return 0; | |
893 | ||
87bf572e | 894 | /* prevent label manipulation while the kernel owns label updates */ |
bf9bccc1 | 895 | wait_nvdimm_bus_probe_idle(&nvdimm_bus->dev); |
eaf96153 DW |
896 | if (atomic_read(&nvdimm->busy)) |
897 | return -EBUSY; | |
898 | return 0; | |
899 | } | |
900 | ||
62232e45 DW |
901 | static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm, |
902 | int read_only, unsigned int ioctl_cmd, unsigned long arg) | |
903 | { | |
904 | struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; | |
905 | size_t buf_len = 0, in_len = 0, out_len = 0; | |
906 | static char out_env[ND_CMD_MAX_ENVELOPE]; | |
907 | static char in_env[ND_CMD_MAX_ENVELOPE]; | |
908 | const struct nd_cmd_desc *desc = NULL; | |
909 | unsigned int cmd = _IOC_NR(ioctl_cmd); | |
910 | void __user *p = (void __user *) arg; | |
911 | struct device *dev = &nvdimm_bus->dev; | |
31eca76b | 912 | struct nd_cmd_pkg pkg; |
62232e45 | 913 | const char *cmd_name, *dimm_name; |
e3654eca | 914 | unsigned long cmd_mask; |
62232e45 | 915 | void *buf; |
006358b3 | 916 | int rc, i, cmd_rc; |
62232e45 DW |
917 | |
918 | if (nvdimm) { | |
919 | desc = nd_cmd_dimm_desc(cmd); | |
920 | cmd_name = nvdimm_cmd_name(cmd); | |
e3654eca | 921 | cmd_mask = nvdimm->cmd_mask; |
62232e45 DW |
922 | dimm_name = dev_name(&nvdimm->dev); |
923 | } else { | |
924 | desc = nd_cmd_bus_desc(cmd); | |
925 | cmd_name = nvdimm_bus_cmd_name(cmd); | |
e3654eca | 926 | cmd_mask = nd_desc->cmd_mask; |
62232e45 DW |
927 | dimm_name = "bus"; |
928 | } | |
929 | ||
31eca76b DW |
930 | if (cmd == ND_CMD_CALL) { |
931 | if (copy_from_user(&pkg, p, sizeof(pkg))) | |
932 | return -EFAULT; | |
933 | } | |
934 | ||
62232e45 | 935 | if (!desc || (desc->out_num + desc->in_num == 0) || |
e3654eca | 936 | !test_bit(cmd, &cmd_mask)) |
62232e45 DW |
937 | return -ENOTTY; |
938 | ||
939 | /* fail write commands (when read-only) */ | |
940 | if (read_only) | |
07accfa9 JH |
941 | switch (cmd) { |
942 | case ND_CMD_VENDOR: | |
943 | case ND_CMD_SET_CONFIG_DATA: | |
944 | case ND_CMD_ARS_START: | |
d4f32367 | 945 | case ND_CMD_CLEAR_ERROR: |
31eca76b | 946 | case ND_CMD_CALL: |
62232e45 DW |
947 | dev_dbg(&nvdimm_bus->dev, "'%s' command while read-only.\n", |
948 | nvdimm ? nvdimm_cmd_name(cmd) | |
949 | : nvdimm_bus_cmd_name(cmd)); | |
950 | return -EPERM; | |
951 | default: | |
952 | break; | |
953 | } | |
954 | ||
955 | /* process an input envelope */ | |
956 | for (i = 0; i < desc->in_num; i++) { | |
957 | u32 in_size, copy; | |
958 | ||
959 | in_size = nd_cmd_in_size(nvdimm, cmd, desc, i, in_env); | |
960 | if (in_size == UINT_MAX) { | |
961 | dev_err(dev, "%s:%s unknown input size cmd: %s field: %d\n", | |
962 | __func__, dimm_name, cmd_name, i); | |
963 | return -ENXIO; | |
964 | } | |
62232e45 DW |
965 | if (in_len < sizeof(in_env)) |
966 | copy = min_t(u32, sizeof(in_env) - in_len, in_size); | |
967 | else | |
968 | copy = 0; | |
969 | if (copy && copy_from_user(&in_env[in_len], p + in_len, copy)) | |
970 | return -EFAULT; | |
971 | in_len += in_size; | |
972 | } | |
973 | ||
31eca76b DW |
974 | if (cmd == ND_CMD_CALL) { |
975 | dev_dbg(dev, "%s:%s, idx: %llu, in: %zu, out: %zu, len %zu\n", | |
976 | __func__, dimm_name, pkg.nd_command, | |
977 | in_len, out_len, buf_len); | |
978 | ||
979 | for (i = 0; i < ARRAY_SIZE(pkg.nd_reserved2); i++) | |
980 | if (pkg.nd_reserved2[i]) | |
981 | return -EINVAL; | |
982 | } | |
983 | ||
62232e45 DW |
984 | /* process an output envelope */ |
985 | for (i = 0; i < desc->out_num; i++) { | |
986 | u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i, | |
efda1b5d | 987 | (u32 *) in_env, (u32 *) out_env, 0); |
62232e45 DW |
988 | u32 copy; |
989 | ||
990 | if (out_size == UINT_MAX) { | |
991 | dev_dbg(dev, "%s:%s unknown output size cmd: %s field: %d\n", | |
992 | __func__, dimm_name, cmd_name, i); | |
993 | return -EFAULT; | |
994 | } | |
62232e45 DW |
995 | if (out_len < sizeof(out_env)) |
996 | copy = min_t(u32, sizeof(out_env) - out_len, out_size); | |
997 | else | |
998 | copy = 0; | |
999 | if (copy && copy_from_user(&out_env[out_len], | |
1000 | p + in_len + out_len, copy)) | |
1001 | return -EFAULT; | |
1002 | out_len += out_size; | |
1003 | } | |
1004 | ||
1005 | buf_len = out_len + in_len; | |
62232e45 DW |
1006 | if (buf_len > ND_IOCTL_MAX_BUFLEN) { |
1007 | dev_dbg(dev, "%s:%s cmd: %s buf_len: %zu > %d\n", __func__, | |
1008 | dimm_name, cmd_name, buf_len, | |
1009 | ND_IOCTL_MAX_BUFLEN); | |
1010 | return -EINVAL; | |
1011 | } | |
1012 | ||
1013 | buf = vmalloc(buf_len); | |
1014 | if (!buf) | |
1015 | return -ENOMEM; | |
1016 | ||
1017 | if (copy_from_user(buf, p, buf_len)) { | |
1018 | rc = -EFAULT; | |
1019 | goto out; | |
1020 | } | |
1021 | ||
eaf96153 | 1022 | nvdimm_bus_lock(&nvdimm_bus->dev); |
006358b3 | 1023 | rc = nd_cmd_clear_to_send(nvdimm_bus, nvdimm, cmd, buf); |
eaf96153 DW |
1024 | if (rc) |
1025 | goto out_unlock; | |
1026 | ||
006358b3 | 1027 | rc = nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len, &cmd_rc); |
62232e45 | 1028 | if (rc < 0) |
eaf96153 | 1029 | goto out_unlock; |
006358b3 DJ |
1030 | |
1031 | if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR && cmd_rc >= 0) { | |
1032 | struct nd_cmd_clear_error *clear_err = buf; | |
006358b3 | 1033 | |
23f49844 DW |
1034 | nvdimm_account_cleared_poison(nvdimm_bus, clear_err->address, |
1035 | clear_err->cleared); | |
006358b3 | 1036 | } |
0beb2012 DW |
1037 | nvdimm_bus_unlock(&nvdimm_bus->dev); |
1038 | ||
62232e45 DW |
1039 | if (copy_to_user(p, buf, buf_len)) |
1040 | rc = -EFAULT; | |
0beb2012 DW |
1041 | |
1042 | vfree(buf); | |
1043 | return rc; | |
1044 | ||
eaf96153 DW |
1045 | out_unlock: |
1046 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
62232e45 DW |
1047 | out: |
1048 | vfree(buf); | |
1049 | return rc; | |
1050 | } | |
1051 | ||
45def22c DW |
1052 | static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1053 | { | |
62232e45 | 1054 | long id = (long) file->private_data; |
4dc0e7be | 1055 | int rc = -ENXIO, ro; |
62232e45 DW |
1056 | struct nvdimm_bus *nvdimm_bus; |
1057 | ||
4dc0e7be | 1058 | ro = ((file->f_flags & O_ACCMODE) == O_RDONLY); |
62232e45 DW |
1059 | mutex_lock(&nvdimm_bus_list_mutex); |
1060 | list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) { | |
1061 | if (nvdimm_bus->id == id) { | |
4dc0e7be | 1062 | rc = __nd_ioctl(nvdimm_bus, NULL, ro, cmd, arg); |
62232e45 DW |
1063 | break; |
1064 | } | |
1065 | } | |
1066 | mutex_unlock(&nvdimm_bus_list_mutex); | |
1067 | ||
1068 | return rc; | |
1069 | } | |
1070 | ||
1071 | static int match_dimm(struct device *dev, void *data) | |
1072 | { | |
1073 | long id = (long) data; | |
1074 | ||
1075 | if (is_nvdimm(dev)) { | |
1076 | struct nvdimm *nvdimm = to_nvdimm(dev); | |
1077 | ||
1078 | return nvdimm->id == id; | |
1079 | } | |
1080 | ||
1081 | return 0; | |
1082 | } | |
1083 | ||
1084 | static long nvdimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1085 | { | |
4dc0e7be | 1086 | int rc = -ENXIO, ro; |
62232e45 DW |
1087 | struct nvdimm_bus *nvdimm_bus; |
1088 | ||
4dc0e7be | 1089 | ro = ((file->f_flags & O_ACCMODE) == O_RDONLY); |
62232e45 DW |
1090 | mutex_lock(&nvdimm_bus_list_mutex); |
1091 | list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) { | |
1092 | struct device *dev = device_find_child(&nvdimm_bus->dev, | |
1093 | file->private_data, match_dimm); | |
1094 | struct nvdimm *nvdimm; | |
1095 | ||
1096 | if (!dev) | |
1097 | continue; | |
1098 | ||
1099 | nvdimm = to_nvdimm(dev); | |
4dc0e7be | 1100 | rc = __nd_ioctl(nvdimm_bus, nvdimm, ro, cmd, arg); |
62232e45 DW |
1101 | put_device(dev); |
1102 | break; | |
1103 | } | |
1104 | mutex_unlock(&nvdimm_bus_list_mutex); | |
1105 | ||
1106 | return rc; | |
1107 | } | |
1108 | ||
1109 | static int nd_open(struct inode *inode, struct file *file) | |
1110 | { | |
1111 | long minor = iminor(inode); | |
1112 | ||
1113 | file->private_data = (void *) minor; | |
1114 | return 0; | |
45def22c DW |
1115 | } |
1116 | ||
1117 | static const struct file_operations nvdimm_bus_fops = { | |
1118 | .owner = THIS_MODULE, | |
62232e45 | 1119 | .open = nd_open, |
45def22c DW |
1120 | .unlocked_ioctl = nd_ioctl, |
1121 | .compat_ioctl = nd_ioctl, | |
1122 | .llseek = noop_llseek, | |
1123 | }; | |
1124 | ||
62232e45 DW |
1125 | static const struct file_operations nvdimm_fops = { |
1126 | .owner = THIS_MODULE, | |
1127 | .open = nd_open, | |
1128 | .unlocked_ioctl = nvdimm_ioctl, | |
1129 | .compat_ioctl = nvdimm_ioctl, | |
1130 | .llseek = noop_llseek, | |
1131 | }; | |
1132 | ||
45def22c DW |
1133 | int __init nvdimm_bus_init(void) |
1134 | { | |
1135 | int rc; | |
1136 | ||
baa51277 DW |
1137 | BUILD_BUG_ON(sizeof(struct nd_smart_payload) != 128); |
1138 | BUILD_BUG_ON(sizeof(struct nd_smart_threshold_payload) != 8); | |
1139 | ||
e6dfb2de DW |
1140 | rc = bus_register(&nvdimm_bus_type); |
1141 | if (rc) | |
1142 | return rc; | |
1143 | ||
45def22c DW |
1144 | rc = register_chrdev(0, "ndctl", &nvdimm_bus_fops); |
1145 | if (rc < 0) | |
62232e45 | 1146 | goto err_bus_chrdev; |
45def22c DW |
1147 | nvdimm_bus_major = rc; |
1148 | ||
62232e45 DW |
1149 | rc = register_chrdev(0, "dimmctl", &nvdimm_fops); |
1150 | if (rc < 0) | |
1151 | goto err_dimm_chrdev; | |
1152 | nvdimm_major = rc; | |
1153 | ||
45def22c | 1154 | nd_class = class_create(THIS_MODULE, "nd"); |
daa1dee4 AL |
1155 | if (IS_ERR(nd_class)) { |
1156 | rc = PTR_ERR(nd_class); | |
45def22c | 1157 | goto err_class; |
daa1dee4 | 1158 | } |
45def22c | 1159 | |
18515942 DW |
1160 | rc = driver_register(&nd_bus_driver.drv); |
1161 | if (rc) | |
1162 | goto err_nd_bus; | |
1163 | ||
45def22c DW |
1164 | return 0; |
1165 | ||
18515942 DW |
1166 | err_nd_bus: |
1167 | class_destroy(nd_class); | |
45def22c | 1168 | err_class: |
62232e45 DW |
1169 | unregister_chrdev(nvdimm_major, "dimmctl"); |
1170 | err_dimm_chrdev: | |
45def22c | 1171 | unregister_chrdev(nvdimm_bus_major, "ndctl"); |
62232e45 | 1172 | err_bus_chrdev: |
e6dfb2de | 1173 | bus_unregister(&nvdimm_bus_type); |
45def22c DW |
1174 | |
1175 | return rc; | |
1176 | } | |
1177 | ||
4d88a97a | 1178 | void nvdimm_bus_exit(void) |
45def22c | 1179 | { |
18515942 | 1180 | driver_unregister(&nd_bus_driver.drv); |
45def22c DW |
1181 | class_destroy(nd_class); |
1182 | unregister_chrdev(nvdimm_bus_major, "ndctl"); | |
62232e45 | 1183 | unregister_chrdev(nvdimm_major, "dimmctl"); |
e6dfb2de | 1184 | bus_unregister(&nvdimm_bus_type); |
18515942 | 1185 | ida_destroy(&nd_ida); |
45def22c | 1186 | } |