Commit | Line | Data |
---|---|---|
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 | |
aa9ad44a | 14 | #include <linux/libnvdimm.h> |
0930a750 | 15 | #include <linux/sched/mm.h> |
62232e45 | 16 | #include <linux/vmalloc.h> |
45def22c | 17 | #include <linux/uaccess.h> |
3d88002e | 18 | #include <linux/module.h> |
8c2f7e86 | 19 | #include <linux/blkdev.h> |
45def22c | 20 | #include <linux/fcntl.h> |
e6dfb2de | 21 | #include <linux/async.h> |
8c2f7e86 | 22 | #include <linux/genhd.h> |
62232e45 | 23 | #include <linux/ndctl.h> |
4d88a97a | 24 | #include <linux/sched.h> |
45def22c DW |
25 | #include <linux/slab.h> |
26 | #include <linux/fs.h> | |
27 | #include <linux/io.h> | |
62232e45 | 28 | #include <linux/mm.h> |
4d88a97a | 29 | #include <linux/nd.h> |
45def22c | 30 | #include "nd-core.h" |
4d88a97a | 31 | #include "nd.h" |
006358b3 | 32 | #include "pfn.h" |
45def22c | 33 | |
62232e45 | 34 | int nvdimm_major; |
45def22c DW |
35 | static int nvdimm_bus_major; |
36 | static struct class *nd_class; | |
18515942 | 37 | static DEFINE_IDA(nd_ida); |
45def22c | 38 | |
4d88a97a DW |
39 | static int to_nd_device_type(struct device *dev) |
40 | { | |
41 | if (is_nvdimm(dev)) | |
42 | return ND_DEVICE_DIMM; | |
c9e582aa | 43 | else if (is_memory(dev)) |
3d88002e DW |
44 | return ND_DEVICE_REGION_PMEM; |
45 | else if (is_nd_blk(dev)) | |
46 | return ND_DEVICE_REGION_BLK; | |
cd03412a DW |
47 | else if (is_nd_dax(dev)) |
48 | return ND_DEVICE_DAX_PMEM; | |
c9e582aa | 49 | else if (is_nd_region(dev->parent)) |
3d88002e | 50 | return nd_region_to_nstype(to_nd_region(dev->parent)); |
4d88a97a DW |
51 | |
52 | return 0; | |
53 | } | |
54 | ||
55 | static int nvdimm_bus_uevent(struct device *dev, struct kobj_uevent_env *env) | |
56 | { | |
41d7a6d6 TK |
57 | /* |
58 | * Ensure that region devices always have their numa node set as | |
59 | * early as possible. | |
60 | */ | |
c9e582aa | 61 | if (is_nd_region(dev)) |
41d7a6d6 | 62 | set_dev_node(dev, to_nd_region(dev)->numa_node); |
4d88a97a DW |
63 | return add_uevent_var(env, "MODALIAS=" ND_DEVICE_MODALIAS_FMT, |
64 | to_nd_device_type(dev)); | |
65 | } | |
66 | ||
3d88002e DW |
67 | static struct module *to_bus_provider(struct device *dev) |
68 | { | |
69 | /* pin bus providers while regions are enabled */ | |
c9e582aa | 70 | if (is_nd_region(dev)) { |
3d88002e DW |
71 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
72 | ||
bc9775d8 | 73 | return nvdimm_bus->nd_desc->module; |
3d88002e DW |
74 | } |
75 | return NULL; | |
76 | } | |
77 | ||
eaf96153 DW |
78 | static void nvdimm_bus_probe_start(struct nvdimm_bus *nvdimm_bus) |
79 | { | |
80 | nvdimm_bus_lock(&nvdimm_bus->dev); | |
81 | nvdimm_bus->probe_active++; | |
82 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
83 | } | |
84 | ||
85 | static void nvdimm_bus_probe_end(struct nvdimm_bus *nvdimm_bus) | |
86 | { | |
87 | nvdimm_bus_lock(&nvdimm_bus->dev); | |
88 | if (--nvdimm_bus->probe_active == 0) | |
89 | wake_up(&nvdimm_bus->probe_wait); | |
90 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
91 | } | |
92 | ||
4d88a97a DW |
93 | static int nvdimm_bus_probe(struct device *dev) |
94 | { | |
95 | struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver); | |
3d88002e | 96 | struct module *provider = to_bus_provider(dev); |
4d88a97a DW |
97 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
98 | int rc; | |
99 | ||
3d88002e DW |
100 | if (!try_module_get(provider)) |
101 | return -ENXIO; | |
102 | ||
3f46833d DW |
103 | dev_dbg(&nvdimm_bus->dev, "START: %s.probe(%s)\n", |
104 | dev->driver->name, dev_name(dev)); | |
105 | ||
eaf96153 | 106 | nvdimm_bus_probe_start(nvdimm_bus); |
4d88a97a | 107 | rc = nd_drv->probe(dev); |
eaf96153 DW |
108 | if (rc == 0) |
109 | nd_region_probe_success(nvdimm_bus, dev); | |
bf9bccc1 DW |
110 | else |
111 | nd_region_disable(nvdimm_bus, dev); | |
eaf96153 DW |
112 | nvdimm_bus_probe_end(nvdimm_bus); |
113 | ||
3f46833d | 114 | dev_dbg(&nvdimm_bus->dev, "END: %s.probe(%s) = %d\n", dev->driver->name, |
4d88a97a | 115 | dev_name(dev), rc); |
8c2f7e86 | 116 | |
3d88002e DW |
117 | if (rc != 0) |
118 | module_put(provider); | |
4d88a97a DW |
119 | return rc; |
120 | } | |
121 | ||
122 | static int nvdimm_bus_remove(struct device *dev) | |
123 | { | |
124 | struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver); | |
3d88002e | 125 | struct module *provider = to_bus_provider(dev); |
4d88a97a | 126 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
6cf9c5ba | 127 | int rc = 0; |
4d88a97a | 128 | |
6cf9c5ba DW |
129 | if (nd_drv->remove) |
130 | rc = nd_drv->remove(dev); | |
eaf96153 DW |
131 | nd_region_disable(nvdimm_bus, dev); |
132 | ||
4d88a97a DW |
133 | dev_dbg(&nvdimm_bus->dev, "%s.remove(%s) = %d\n", dev->driver->name, |
134 | dev_name(dev), rc); | |
3d88002e | 135 | module_put(provider); |
4d88a97a DW |
136 | return rc; |
137 | } | |
138 | ||
476f848a DW |
139 | static void nvdimm_bus_shutdown(struct device *dev) |
140 | { | |
141 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
142 | struct nd_device_driver *nd_drv = NULL; | |
143 | ||
144 | if (dev->driver) | |
145 | nd_drv = to_nd_device_driver(dev->driver); | |
146 | ||
147 | if (nd_drv && nd_drv->shutdown) { | |
148 | nd_drv->shutdown(dev); | |
149 | dev_dbg(&nvdimm_bus->dev, "%s.shutdown(%s)\n", | |
150 | dev->driver->name, dev_name(dev)); | |
151 | } | |
152 | } | |
153 | ||
71999466 DW |
154 | void nd_device_notify(struct device *dev, enum nvdimm_event event) |
155 | { | |
156 | device_lock(dev); | |
157 | if (dev->driver) { | |
158 | struct nd_device_driver *nd_drv; | |
159 | ||
160 | nd_drv = to_nd_device_driver(dev->driver); | |
161 | if (nd_drv->notify) | |
162 | nd_drv->notify(dev, event); | |
163 | } | |
164 | device_unlock(dev); | |
165 | } | |
166 | EXPORT_SYMBOL(nd_device_notify); | |
167 | ||
168 | void nvdimm_region_notify(struct nd_region *nd_region, enum nvdimm_event event) | |
169 | { | |
170 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev); | |
171 | ||
172 | if (!nvdimm_bus) | |
173 | return; | |
174 | ||
175 | /* caller is responsible for holding a reference on the device */ | |
176 | nd_device_notify(&nd_region->dev, event); | |
177 | } | |
178 | EXPORT_SYMBOL_GPL(nvdimm_region_notify); | |
179 | ||
23f49844 DW |
180 | struct clear_badblocks_context { |
181 | resource_size_t phys, cleared; | |
182 | }; | |
183 | ||
184 | static int nvdimm_clear_badblocks_region(struct device *dev, void *data) | |
185 | { | |
186 | struct clear_badblocks_context *ctx = data; | |
187 | struct nd_region *nd_region; | |
188 | resource_size_t ndr_end; | |
189 | sector_t sector; | |
190 | ||
191 | /* make sure device is a region */ | |
192 | if (!is_nd_pmem(dev)) | |
193 | return 0; | |
194 | ||
195 | nd_region = to_nd_region(dev); | |
196 | ndr_end = nd_region->ndr_start + nd_region->ndr_size - 1; | |
197 | ||
198 | /* make sure we are in the region */ | |
199 | if (ctx->phys < nd_region->ndr_start | |
200 | || (ctx->phys + ctx->cleared) > ndr_end) | |
201 | return 0; | |
202 | ||
203 | sector = (ctx->phys - nd_region->ndr_start) / 512; | |
204 | badblocks_clear(&nd_region->bb, sector, ctx->cleared / 512); | |
205 | ||
975750a9 TK |
206 | if (nd_region->bb_state) |
207 | sysfs_notify_dirent(nd_region->bb_state); | |
208 | ||
23f49844 DW |
209 | return 0; |
210 | } | |
211 | ||
212 | static void nvdimm_clear_badblocks_regions(struct nvdimm_bus *nvdimm_bus, | |
213 | phys_addr_t phys, u64 cleared) | |
214 | { | |
215 | struct clear_badblocks_context ctx = { | |
216 | .phys = phys, | |
217 | .cleared = cleared, | |
218 | }; | |
219 | ||
220 | device_for_each_child(&nvdimm_bus->dev, &ctx, | |
221 | nvdimm_clear_badblocks_region); | |
222 | } | |
223 | ||
224 | static void nvdimm_account_cleared_poison(struct nvdimm_bus *nvdimm_bus, | |
225 | phys_addr_t phys, u64 cleared) | |
226 | { | |
227 | if (cleared > 0) | |
aa9ad44a | 228 | badrange_forget(&nvdimm_bus->badrange, phys, cleared); |
23f49844 DW |
229 | |
230 | if (cleared > 0 && cleared / 512) | |
231 | nvdimm_clear_badblocks_regions(nvdimm_bus, phys, cleared); | |
232 | } | |
233 | ||
59e64739 DW |
234 | long nvdimm_clear_poison(struct device *dev, phys_addr_t phys, |
235 | unsigned int len) | |
236 | { | |
237 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
238 | struct nvdimm_bus_descriptor *nd_desc; | |
239 | struct nd_cmd_clear_error clear_err; | |
240 | struct nd_cmd_ars_cap ars_cap; | |
241 | u32 clear_err_unit, mask; | |
0930a750 | 242 | unsigned int noio_flag; |
59e64739 DW |
243 | int cmd_rc, rc; |
244 | ||
245 | if (!nvdimm_bus) | |
246 | return -ENXIO; | |
247 | ||
248 | nd_desc = nvdimm_bus->nd_desc; | |
1e8b8d96 DJ |
249 | /* |
250 | * if ndctl does not exist, it's PMEM_LEGACY and | |
251 | * we want to just pretend everything is handled. | |
252 | */ | |
59e64739 | 253 | if (!nd_desc->ndctl) |
1e8b8d96 | 254 | return len; |
59e64739 DW |
255 | |
256 | memset(&ars_cap, 0, sizeof(ars_cap)); | |
257 | ars_cap.address = phys; | |
258 | ars_cap.length = len; | |
0930a750 | 259 | noio_flag = memalloc_noio_save(); |
59e64739 DW |
260 | rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, &ars_cap, |
261 | sizeof(ars_cap), &cmd_rc); | |
0930a750 | 262 | memalloc_noio_restore(noio_flag); |
59e64739 DW |
263 | if (rc < 0) |
264 | return rc; | |
265 | if (cmd_rc < 0) | |
266 | return cmd_rc; | |
267 | clear_err_unit = ars_cap.clear_err_unit; | |
268 | if (!clear_err_unit || !is_power_of_2(clear_err_unit)) | |
269 | return -ENXIO; | |
270 | ||
271 | mask = clear_err_unit - 1; | |
272 | if ((phys | len) & mask) | |
273 | return -ENXIO; | |
274 | memset(&clear_err, 0, sizeof(clear_err)); | |
275 | clear_err.address = phys; | |
276 | clear_err.length = len; | |
0930a750 | 277 | noio_flag = memalloc_noio_save(); |
59e64739 DW |
278 | rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_CLEAR_ERROR, &clear_err, |
279 | sizeof(clear_err), &cmd_rc); | |
0930a750 | 280 | memalloc_noio_restore(noio_flag); |
59e64739 DW |
281 | if (rc < 0) |
282 | return rc; | |
283 | if (cmd_rc < 0) | |
284 | return cmd_rc; | |
e046114a | 285 | |
23f49844 | 286 | nvdimm_account_cleared_poison(nvdimm_bus, phys, clear_err.cleared); |
8d13c029 | 287 | |
59e64739 DW |
288 | return clear_err.cleared; |
289 | } | |
290 | EXPORT_SYMBOL_GPL(nvdimm_clear_poison); | |
291 | ||
18515942 DW |
292 | static int nvdimm_bus_match(struct device *dev, struct device_driver *drv); |
293 | ||
4d88a97a | 294 | static struct bus_type nvdimm_bus_type = { |
e6dfb2de | 295 | .name = "nd", |
4d88a97a DW |
296 | .uevent = nvdimm_bus_uevent, |
297 | .match = nvdimm_bus_match, | |
298 | .probe = nvdimm_bus_probe, | |
299 | .remove = nvdimm_bus_remove, | |
476f848a | 300 | .shutdown = nvdimm_bus_shutdown, |
4d88a97a DW |
301 | }; |
302 | ||
18515942 DW |
303 | static void nvdimm_bus_release(struct device *dev) |
304 | { | |
305 | struct nvdimm_bus *nvdimm_bus; | |
306 | ||
307 | nvdimm_bus = container_of(dev, struct nvdimm_bus, dev); | |
308 | ida_simple_remove(&nd_ida, nvdimm_bus->id); | |
309 | kfree(nvdimm_bus); | |
310 | } | |
311 | ||
312 | static bool is_nvdimm_bus(struct device *dev) | |
313 | { | |
314 | return dev->release == nvdimm_bus_release; | |
315 | } | |
316 | ||
317 | struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev) | |
318 | { | |
319 | struct device *dev; | |
320 | ||
321 | for (dev = nd_dev; dev; dev = dev->parent) | |
322 | if (is_nvdimm_bus(dev)) | |
323 | break; | |
324 | dev_WARN_ONCE(nd_dev, !dev, "invalid dev, not on nd bus\n"); | |
325 | if (dev) | |
326 | return to_nvdimm_bus(dev); | |
327 | return NULL; | |
328 | } | |
329 | ||
330 | struct nvdimm_bus *to_nvdimm_bus(struct device *dev) | |
331 | { | |
332 | struct nvdimm_bus *nvdimm_bus; | |
333 | ||
334 | nvdimm_bus = container_of(dev, struct nvdimm_bus, dev); | |
335 | WARN_ON(!is_nvdimm_bus(dev)); | |
336 | return nvdimm_bus; | |
337 | } | |
338 | EXPORT_SYMBOL_GPL(to_nvdimm_bus); | |
339 | ||
340 | struct nvdimm_bus *nvdimm_bus_register(struct device *parent, | |
341 | struct nvdimm_bus_descriptor *nd_desc) | |
342 | { | |
343 | struct nvdimm_bus *nvdimm_bus; | |
344 | int rc; | |
345 | ||
346 | nvdimm_bus = kzalloc(sizeof(*nvdimm_bus), GFP_KERNEL); | |
347 | if (!nvdimm_bus) | |
348 | return NULL; | |
349 | INIT_LIST_HEAD(&nvdimm_bus->list); | |
350 | INIT_LIST_HEAD(&nvdimm_bus->mapping_list); | |
18515942 DW |
351 | init_waitqueue_head(&nvdimm_bus->probe_wait); |
352 | nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL); | |
353 | mutex_init(&nvdimm_bus->reconfig_mutex); | |
aa9ad44a | 354 | badrange_init(&nvdimm_bus->badrange); |
18515942 DW |
355 | if (nvdimm_bus->id < 0) { |
356 | kfree(nvdimm_bus); | |
357 | return NULL; | |
358 | } | |
359 | nvdimm_bus->nd_desc = nd_desc; | |
360 | nvdimm_bus->dev.parent = parent; | |
361 | nvdimm_bus->dev.release = nvdimm_bus_release; | |
362 | nvdimm_bus->dev.groups = nd_desc->attr_groups; | |
363 | nvdimm_bus->dev.bus = &nvdimm_bus_type; | |
1ff19f48 | 364 | nvdimm_bus->dev.of_node = nd_desc->of_node; |
18515942 DW |
365 | dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id); |
366 | rc = device_register(&nvdimm_bus->dev); | |
367 | if (rc) { | |
368 | dev_dbg(&nvdimm_bus->dev, "registration failed: %d\n", rc); | |
369 | goto err; | |
370 | } | |
371 | ||
372 | return nvdimm_bus; | |
373 | err: | |
374 | put_device(&nvdimm_bus->dev); | |
375 | return NULL; | |
376 | } | |
377 | EXPORT_SYMBOL_GPL(nvdimm_bus_register); | |
378 | ||
379 | void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus) | |
380 | { | |
381 | if (!nvdimm_bus) | |
382 | return; | |
383 | device_unregister(&nvdimm_bus->dev); | |
384 | } | |
385 | EXPORT_SYMBOL_GPL(nvdimm_bus_unregister); | |
386 | ||
387 | static int child_unregister(struct device *dev, void *data) | |
388 | { | |
389 | /* | |
390 | * the singular ndctl class device per bus needs to be | |
391 | * "device_destroy"ed, so skip it here | |
392 | * | |
393 | * i.e. remove classless children | |
394 | */ | |
395 | if (dev->class) | |
396 | /* pass */; | |
397 | else | |
398 | nd_device_unregister(dev, ND_SYNC); | |
399 | return 0; | |
400 | } | |
401 | ||
aa9ad44a | 402 | static void free_badrange_list(struct list_head *badrange_list) |
18515942 | 403 | { |
aa9ad44a | 404 | struct badrange_entry *bre, *next; |
18515942 | 405 | |
aa9ad44a DJ |
406 | list_for_each_entry_safe(bre, next, badrange_list, list) { |
407 | list_del(&bre->list); | |
408 | kfree(bre); | |
18515942 | 409 | } |
aa9ad44a | 410 | list_del_init(badrange_list); |
18515942 DW |
411 | } |
412 | ||
413 | static int nd_bus_remove(struct device *dev) | |
414 | { | |
415 | struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); | |
416 | ||
417 | mutex_lock(&nvdimm_bus_list_mutex); | |
418 | list_del_init(&nvdimm_bus->list); | |
419 | mutex_unlock(&nvdimm_bus_list_mutex); | |
420 | ||
421 | nd_synchronize(); | |
422 | device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister); | |
423 | ||
aa9ad44a DJ |
424 | spin_lock(&nvdimm_bus->badrange.lock); |
425 | free_badrange_list(&nvdimm_bus->badrange.list); | |
426 | spin_unlock(&nvdimm_bus->badrange.lock); | |
18515942 DW |
427 | |
428 | nvdimm_bus_destroy_ndctl(nvdimm_bus); | |
429 | ||
430 | return 0; | |
431 | } | |
432 | ||
433 | static int nd_bus_probe(struct device *dev) | |
434 | { | |
435 | struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); | |
436 | int rc; | |
437 | ||
438 | rc = nvdimm_bus_create_ndctl(nvdimm_bus); | |
439 | if (rc) | |
440 | return rc; | |
441 | ||
442 | mutex_lock(&nvdimm_bus_list_mutex); | |
443 | list_add_tail(&nvdimm_bus->list, &nvdimm_bus_list); | |
444 | mutex_unlock(&nvdimm_bus_list_mutex); | |
445 | ||
446 | /* enable bus provider attributes to look up their local context */ | |
447 | dev_set_drvdata(dev, nvdimm_bus->nd_desc); | |
448 | ||
449 | return 0; | |
450 | } | |
451 | ||
452 | static struct nd_device_driver nd_bus_driver = { | |
453 | .probe = nd_bus_probe, | |
454 | .remove = nd_bus_remove, | |
455 | .drv = { | |
456 | .name = "nd_bus", | |
457 | .suppress_bind_attrs = true, | |
458 | .bus = &nvdimm_bus_type, | |
459 | .owner = THIS_MODULE, | |
460 | .mod_name = KBUILD_MODNAME, | |
461 | }, | |
4d88a97a DW |
462 | }; |
463 | ||
18515942 DW |
464 | static int nvdimm_bus_match(struct device *dev, struct device_driver *drv) |
465 | { | |
466 | struct nd_device_driver *nd_drv = to_nd_device_driver(drv); | |
467 | ||
468 | if (is_nvdimm_bus(dev) && nd_drv == &nd_bus_driver) | |
469 | return true; | |
470 | ||
471 | return !!test_bit(to_nd_device_type(dev), &nd_drv->type); | |
472 | } | |
473 | ||
4d88a97a DW |
474 | static ASYNC_DOMAIN_EXCLUSIVE(nd_async_domain); |
475 | ||
476 | void nd_synchronize(void) | |
477 | { | |
478 | async_synchronize_full_domain(&nd_async_domain); | |
479 | } | |
480 | EXPORT_SYMBOL_GPL(nd_synchronize); | |
481 | ||
482 | static void nd_async_device_register(void *d, async_cookie_t cookie) | |
483 | { | |
484 | struct device *dev = d; | |
485 | ||
486 | if (device_add(dev) != 0) { | |
487 | dev_err(dev, "%s: failed\n", __func__); | |
488 | put_device(dev); | |
489 | } | |
490 | put_device(dev); | |
491 | } | |
492 | ||
493 | static void nd_async_device_unregister(void *d, async_cookie_t cookie) | |
494 | { | |
495 | struct device *dev = d; | |
496 | ||
0ba1c634 DW |
497 | /* flush bus operations before delete */ |
498 | nvdimm_bus_lock(dev); | |
499 | nvdimm_bus_unlock(dev); | |
500 | ||
4d88a97a DW |
501 | device_unregister(dev); |
502 | put_device(dev); | |
503 | } | |
504 | ||
8c2f7e86 | 505 | void __nd_device_register(struct device *dev) |
4d88a97a | 506 | { |
cd03412a DW |
507 | if (!dev) |
508 | return; | |
4d88a97a | 509 | dev->bus = &nvdimm_bus_type; |
4d88a97a DW |
510 | get_device(dev); |
511 | async_schedule_domain(nd_async_device_register, dev, | |
512 | &nd_async_domain); | |
513 | } | |
8c2f7e86 DW |
514 | |
515 | void nd_device_register(struct device *dev) | |
516 | { | |
517 | device_initialize(dev); | |
518 | __nd_device_register(dev); | |
519 | } | |
4d88a97a DW |
520 | EXPORT_SYMBOL(nd_device_register); |
521 | ||
522 | void nd_device_unregister(struct device *dev, enum nd_async_mode mode) | |
523 | { | |
524 | switch (mode) { | |
525 | case ND_ASYNC: | |
526 | get_device(dev); | |
527 | async_schedule_domain(nd_async_device_unregister, dev, | |
528 | &nd_async_domain); | |
529 | break; | |
530 | case ND_SYNC: | |
531 | nd_synchronize(); | |
532 | device_unregister(dev); | |
533 | break; | |
534 | } | |
535 | } | |
536 | EXPORT_SYMBOL(nd_device_unregister); | |
537 | ||
538 | /** | |
539 | * __nd_driver_register() - register a region or a namespace driver | |
540 | * @nd_drv: driver to register | |
541 | * @owner: automatically set by nd_driver_register() macro | |
542 | * @mod_name: automatically set by nd_driver_register() macro | |
543 | */ | |
544 | int __nd_driver_register(struct nd_device_driver *nd_drv, struct module *owner, | |
545 | const char *mod_name) | |
546 | { | |
547 | struct device_driver *drv = &nd_drv->drv; | |
548 | ||
549 | if (!nd_drv->type) { | |
550 | pr_debug("driver type bitmask not set (%pf)\n", | |
551 | __builtin_return_address(0)); | |
552 | return -EINVAL; | |
553 | } | |
554 | ||
6cf9c5ba DW |
555 | if (!nd_drv->probe) { |
556 | pr_debug("%s ->probe() must be specified\n", mod_name); | |
4d88a97a DW |
557 | return -EINVAL; |
558 | } | |
559 | ||
560 | drv->bus = &nvdimm_bus_type; | |
561 | drv->owner = owner; | |
562 | drv->mod_name = mod_name; | |
563 | ||
564 | return driver_register(drv); | |
565 | } | |
566 | EXPORT_SYMBOL(__nd_driver_register); | |
567 | ||
58138820 DW |
568 | int nvdimm_revalidate_disk(struct gendisk *disk) |
569 | { | |
52c44d93 | 570 | struct device *dev = disk_to_dev(disk)->parent; |
58138820 | 571 | struct nd_region *nd_region = to_nd_region(dev->parent); |
254a4cd5 | 572 | int disk_ro = get_disk_ro(disk); |
58138820 | 573 | |
254a4cd5 RE |
574 | /* |
575 | * Upgrade to read-only if the region is read-only preserve as | |
576 | * read-only if the disk is already read-only. | |
577 | */ | |
578 | if (disk_ro || nd_region->ro == disk_ro) | |
58138820 DW |
579 | return 0; |
580 | ||
254a4cd5 RE |
581 | dev_info(dev, "%s read-only, marking %s read-only\n", |
582 | dev_name(&nd_region->dev), disk->disk_name); | |
583 | set_disk_ro(disk, 1); | |
58138820 DW |
584 | |
585 | return 0; | |
586 | ||
587 | } | |
588 | EXPORT_SYMBOL(nvdimm_revalidate_disk); | |
589 | ||
4d88a97a DW |
590 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, |
591 | char *buf) | |
592 | { | |
593 | return sprintf(buf, ND_DEVICE_MODALIAS_FMT "\n", | |
594 | to_nd_device_type(dev)); | |
595 | } | |
596 | static DEVICE_ATTR_RO(modalias); | |
597 | ||
598 | static ssize_t devtype_show(struct device *dev, struct device_attribute *attr, | |
599 | char *buf) | |
600 | { | |
601 | return sprintf(buf, "%s\n", dev->type->name); | |
602 | } | |
603 | static DEVICE_ATTR_RO(devtype); | |
604 | ||
605 | static struct attribute *nd_device_attributes[] = { | |
606 | &dev_attr_modalias.attr, | |
607 | &dev_attr_devtype.attr, | |
608 | NULL, | |
609 | }; | |
610 | ||
611 | /** | |
612 | * nd_device_attribute_group - generic attributes for all devices on an nd bus | |
613 | */ | |
614 | struct attribute_group nd_device_attribute_group = { | |
615 | .attrs = nd_device_attributes, | |
e6dfb2de | 616 | }; |
4d88a97a | 617 | EXPORT_SYMBOL_GPL(nd_device_attribute_group); |
e6dfb2de | 618 | |
74ae66c3 TK |
619 | static ssize_t numa_node_show(struct device *dev, |
620 | struct device_attribute *attr, char *buf) | |
621 | { | |
622 | return sprintf(buf, "%d\n", dev_to_node(dev)); | |
623 | } | |
624 | static DEVICE_ATTR_RO(numa_node); | |
625 | ||
626 | static struct attribute *nd_numa_attributes[] = { | |
627 | &dev_attr_numa_node.attr, | |
628 | NULL, | |
629 | }; | |
630 | ||
631 | static umode_t nd_numa_attr_visible(struct kobject *kobj, struct attribute *a, | |
632 | int n) | |
633 | { | |
634 | if (!IS_ENABLED(CONFIG_NUMA)) | |
635 | return 0; | |
636 | ||
637 | return a->mode; | |
638 | } | |
639 | ||
640 | /** | |
641 | * nd_numa_attribute_group - NUMA attributes for all devices on an nd bus | |
642 | */ | |
643 | struct attribute_group nd_numa_attribute_group = { | |
644 | .attrs = nd_numa_attributes, | |
645 | .is_visible = nd_numa_attr_visible, | |
646 | }; | |
647 | EXPORT_SYMBOL_GPL(nd_numa_attribute_group); | |
648 | ||
45def22c DW |
649 | int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus) |
650 | { | |
651 | dev_t devt = MKDEV(nvdimm_bus_major, nvdimm_bus->id); | |
652 | struct device *dev; | |
653 | ||
654 | dev = device_create(nd_class, &nvdimm_bus->dev, devt, nvdimm_bus, | |
655 | "ndctl%d", nvdimm_bus->id); | |
656 | ||
42588958 | 657 | if (IS_ERR(dev)) |
45def22c DW |
658 | dev_dbg(&nvdimm_bus->dev, "failed to register ndctl%d: %ld\n", |
659 | nvdimm_bus->id, PTR_ERR(dev)); | |
42588958 | 660 | return PTR_ERR_OR_ZERO(dev); |
45def22c DW |
661 | } |
662 | ||
663 | void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus) | |
664 | { | |
665 | device_destroy(nd_class, MKDEV(nvdimm_bus_major, nvdimm_bus->id)); | |
666 | } | |
667 | ||
62232e45 DW |
668 | static const struct nd_cmd_desc __nd_cmd_dimm_descs[] = { |
669 | [ND_CMD_IMPLEMENTED] = { }, | |
670 | [ND_CMD_SMART] = { | |
671 | .out_num = 2, | |
21129112 | 672 | .out_sizes = { 4, 128, }, |
62232e45 DW |
673 | }, |
674 | [ND_CMD_SMART_THRESHOLD] = { | |
675 | .out_num = 2, | |
676 | .out_sizes = { 4, 8, }, | |
677 | }, | |
678 | [ND_CMD_DIMM_FLAGS] = { | |
679 | .out_num = 2, | |
680 | .out_sizes = { 4, 4 }, | |
681 | }, | |
682 | [ND_CMD_GET_CONFIG_SIZE] = { | |
683 | .out_num = 3, | |
684 | .out_sizes = { 4, 4, 4, }, | |
685 | }, | |
686 | [ND_CMD_GET_CONFIG_DATA] = { | |
687 | .in_num = 2, | |
688 | .in_sizes = { 4, 4, }, | |
689 | .out_num = 2, | |
690 | .out_sizes = { 4, UINT_MAX, }, | |
691 | }, | |
692 | [ND_CMD_SET_CONFIG_DATA] = { | |
693 | .in_num = 3, | |
694 | .in_sizes = { 4, 4, UINT_MAX, }, | |
695 | .out_num = 1, | |
696 | .out_sizes = { 4, }, | |
697 | }, | |
698 | [ND_CMD_VENDOR] = { | |
699 | .in_num = 3, | |
700 | .in_sizes = { 4, 4, UINT_MAX, }, | |
701 | .out_num = 3, | |
702 | .out_sizes = { 4, 4, UINT_MAX, }, | |
703 | }, | |
31eca76b DW |
704 | [ND_CMD_CALL] = { |
705 | .in_num = 2, | |
706 | .in_sizes = { sizeof(struct nd_cmd_pkg), UINT_MAX, }, | |
707 | .out_num = 1, | |
708 | .out_sizes = { UINT_MAX, }, | |
709 | }, | |
62232e45 DW |
710 | }; |
711 | ||
712 | const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd) | |
713 | { | |
714 | if (cmd < ARRAY_SIZE(__nd_cmd_dimm_descs)) | |
715 | return &__nd_cmd_dimm_descs[cmd]; | |
716 | return NULL; | |
717 | } | |
718 | EXPORT_SYMBOL_GPL(nd_cmd_dimm_desc); | |
719 | ||
720 | static const struct nd_cmd_desc __nd_cmd_bus_descs[] = { | |
721 | [ND_CMD_IMPLEMENTED] = { }, | |
722 | [ND_CMD_ARS_CAP] = { | |
723 | .in_num = 2, | |
724 | .in_sizes = { 8, 8, }, | |
4577b066 DW |
725 | .out_num = 4, |
726 | .out_sizes = { 4, 4, 4, 4, }, | |
62232e45 DW |
727 | }, |
728 | [ND_CMD_ARS_START] = { | |
4577b066 DW |
729 | .in_num = 5, |
730 | .in_sizes = { 8, 8, 2, 1, 5, }, | |
731 | .out_num = 2, | |
732 | .out_sizes = { 4, 4, }, | |
62232e45 DW |
733 | }, |
734 | [ND_CMD_ARS_STATUS] = { | |
747ffe11 DW |
735 | .out_num = 3, |
736 | .out_sizes = { 4, 4, UINT_MAX, }, | |
62232e45 | 737 | }, |
d4f32367 DW |
738 | [ND_CMD_CLEAR_ERROR] = { |
739 | .in_num = 2, | |
740 | .in_sizes = { 8, 8, }, | |
741 | .out_num = 3, | |
742 | .out_sizes = { 4, 4, 8, }, | |
743 | }, | |
31eca76b DW |
744 | [ND_CMD_CALL] = { |
745 | .in_num = 2, | |
746 | .in_sizes = { sizeof(struct nd_cmd_pkg), UINT_MAX, }, | |
747 | .out_num = 1, | |
748 | .out_sizes = { UINT_MAX, }, | |
749 | }, | |
62232e45 DW |
750 | }; |
751 | ||
752 | const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd) | |
753 | { | |
754 | if (cmd < ARRAY_SIZE(__nd_cmd_bus_descs)) | |
755 | return &__nd_cmd_bus_descs[cmd]; | |
756 | return NULL; | |
757 | } | |
758 | EXPORT_SYMBOL_GPL(nd_cmd_bus_desc); | |
759 | ||
760 | u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd, | |
761 | const struct nd_cmd_desc *desc, int idx, void *buf) | |
762 | { | |
763 | if (idx >= desc->in_num) | |
764 | return UINT_MAX; | |
765 | ||
766 | if (desc->in_sizes[idx] < UINT_MAX) | |
767 | return desc->in_sizes[idx]; | |
768 | ||
769 | if (nvdimm && cmd == ND_CMD_SET_CONFIG_DATA && idx == 2) { | |
770 | struct nd_cmd_set_config_hdr *hdr = buf; | |
771 | ||
772 | return hdr->in_length; | |
773 | } else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) { | |
774 | struct nd_cmd_vendor_hdr *hdr = buf; | |
775 | ||
776 | return hdr->in_length; | |
31eca76b DW |
777 | } else if (cmd == ND_CMD_CALL) { |
778 | struct nd_cmd_pkg *pkg = buf; | |
779 | ||
780 | return pkg->nd_size_in; | |
62232e45 DW |
781 | } |
782 | ||
783 | return UINT_MAX; | |
784 | } | |
785 | EXPORT_SYMBOL_GPL(nd_cmd_in_size); | |
786 | ||
787 | u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd, | |
788 | const struct nd_cmd_desc *desc, int idx, const u32 *in_field, | |
efda1b5d | 789 | const u32 *out_field, unsigned long remainder) |
62232e45 DW |
790 | { |
791 | if (idx >= desc->out_num) | |
792 | return UINT_MAX; | |
793 | ||
794 | if (desc->out_sizes[idx] < UINT_MAX) | |
795 | return desc->out_sizes[idx]; | |
796 | ||
797 | if (nvdimm && cmd == ND_CMD_GET_CONFIG_DATA && idx == 1) | |
798 | return in_field[1]; | |
799 | else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) | |
800 | return out_field[1]; | |
efda1b5d DW |
801 | else if (!nvdimm && cmd == ND_CMD_ARS_STATUS && idx == 2) { |
802 | /* | |
803 | * Per table 9-276 ARS Data in ACPI 6.1, out_field[1] is | |
804 | * "Size of Output Buffer in bytes, including this | |
805 | * field." | |
806 | */ | |
807 | if (out_field[1] < 4) | |
808 | return 0; | |
809 | /* | |
810 | * ACPI 6.1 is ambiguous if 'status' is included in the | |
811 | * output size. If we encounter an output size that | |
812 | * overshoots the remainder by 4 bytes, assume it was | |
813 | * including 'status'. | |
814 | */ | |
815 | if (out_field[1] - 8 == remainder) | |
816 | return remainder; | |
817 | return out_field[1] - 4; | |
818 | } else if (cmd == ND_CMD_CALL) { | |
31eca76b DW |
819 | struct nd_cmd_pkg *pkg = (struct nd_cmd_pkg *) in_field; |
820 | ||
821 | return pkg->nd_size_out; | |
822 | } | |
823 | ||
62232e45 DW |
824 | |
825 | return UINT_MAX; | |
826 | } | |
827 | EXPORT_SYMBOL_GPL(nd_cmd_out_size); | |
828 | ||
bf9bccc1 | 829 | void wait_nvdimm_bus_probe_idle(struct device *dev) |
eaf96153 | 830 | { |
bf9bccc1 DW |
831 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
832 | ||
eaf96153 DW |
833 | do { |
834 | if (nvdimm_bus->probe_active == 0) | |
835 | break; | |
836 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
837 | wait_event(nvdimm_bus->probe_wait, | |
838 | nvdimm_bus->probe_active == 0); | |
839 | nvdimm_bus_lock(&nvdimm_bus->dev); | |
840 | } while (true); | |
841 | } | |
842 | ||
006358b3 | 843 | static int nd_pmem_forget_poison_check(struct device *dev, void *data) |
d4f32367 | 844 | { |
006358b3 DJ |
845 | struct nd_cmd_clear_error *clear_err = |
846 | (struct nd_cmd_clear_error *)data; | |
847 | struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL; | |
848 | struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL; | |
849 | struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL; | |
850 | struct nd_namespace_common *ndns = NULL; | |
851 | struct nd_namespace_io *nsio; | |
852 | resource_size_t offset = 0, end_trunc = 0, start, end, pstart, pend; | |
853 | ||
854 | if (nd_dax || !dev->driver) | |
855 | return 0; | |
856 | ||
857 | start = clear_err->address; | |
858 | end = clear_err->address + clear_err->cleared - 1; | |
859 | ||
860 | if (nd_btt || nd_pfn || nd_dax) { | |
861 | if (nd_btt) | |
862 | ndns = nd_btt->ndns; | |
863 | else if (nd_pfn) | |
864 | ndns = nd_pfn->ndns; | |
865 | else if (nd_dax) | |
866 | ndns = nd_dax->nd_pfn.ndns; | |
867 | ||
868 | if (!ndns) | |
869 | return 0; | |
870 | } else | |
871 | ndns = to_ndns(dev); | |
872 | ||
873 | nsio = to_nd_namespace_io(&ndns->dev); | |
874 | pstart = nsio->res.start + offset; | |
875 | pend = nsio->res.end - end_trunc; | |
876 | ||
877 | if ((pstart >= start) && (pend <= end)) | |
d4f32367 | 878 | return -EBUSY; |
006358b3 | 879 | |
d4f32367 | 880 | return 0; |
006358b3 DJ |
881 | |
882 | } | |
883 | ||
884 | static int nd_ns_forget_poison_check(struct device *dev, void *data) | |
885 | { | |
886 | return device_for_each_child(dev, data, nd_pmem_forget_poison_check); | |
d4f32367 DW |
887 | } |
888 | ||
eaf96153 | 889 | /* set_config requires an idle interleave set */ |
87bf572e | 890 | static int nd_cmd_clear_to_send(struct nvdimm_bus *nvdimm_bus, |
006358b3 | 891 | struct nvdimm *nvdimm, unsigned int cmd, void *data) |
eaf96153 | 892 | { |
87bf572e DW |
893 | struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; |
894 | ||
895 | /* ask the bus provider if it would like to block this request */ | |
896 | if (nd_desc->clear_to_send) { | |
897 | int rc = nd_desc->clear_to_send(nd_desc, nvdimm, cmd); | |
898 | ||
899 | if (rc) | |
900 | return rc; | |
901 | } | |
eaf96153 | 902 | |
d4f32367 DW |
903 | /* require clear error to go through the pmem driver */ |
904 | if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR) | |
006358b3 DJ |
905 | return device_for_each_child(&nvdimm_bus->dev, data, |
906 | nd_ns_forget_poison_check); | |
d4f32367 | 907 | |
eaf96153 DW |
908 | if (!nvdimm || cmd != ND_CMD_SET_CONFIG_DATA) |
909 | return 0; | |
910 | ||
87bf572e | 911 | /* prevent label manipulation while the kernel owns label updates */ |
bf9bccc1 | 912 | wait_nvdimm_bus_probe_idle(&nvdimm_bus->dev); |
eaf96153 DW |
913 | if (atomic_read(&nvdimm->busy)) |
914 | return -EBUSY; | |
915 | return 0; | |
916 | } | |
917 | ||
62232e45 DW |
918 | static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm, |
919 | int read_only, unsigned int ioctl_cmd, unsigned long arg) | |
920 | { | |
921 | struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; | |
62232e45 DW |
922 | static char out_env[ND_CMD_MAX_ENVELOPE]; |
923 | static char in_env[ND_CMD_MAX_ENVELOPE]; | |
924 | const struct nd_cmd_desc *desc = NULL; | |
925 | unsigned int cmd = _IOC_NR(ioctl_cmd); | |
62232e45 | 926 | struct device *dev = &nvdimm_bus->dev; |
58738c49 | 927 | void __user *p = (void __user *) arg; |
62232e45 | 928 | const char *cmd_name, *dimm_name; |
58738c49 DW |
929 | u32 in_len = 0, out_len = 0; |
930 | unsigned int func = cmd; | |
e3654eca | 931 | unsigned long cmd_mask; |
58738c49 | 932 | struct nd_cmd_pkg pkg; |
006358b3 | 933 | int rc, i, cmd_rc; |
58738c49 DW |
934 | u64 buf_len = 0; |
935 | void *buf; | |
62232e45 DW |
936 | |
937 | if (nvdimm) { | |
938 | desc = nd_cmd_dimm_desc(cmd); | |
939 | cmd_name = nvdimm_cmd_name(cmd); | |
e3654eca | 940 | cmd_mask = nvdimm->cmd_mask; |
62232e45 DW |
941 | dimm_name = dev_name(&nvdimm->dev); |
942 | } else { | |
943 | desc = nd_cmd_bus_desc(cmd); | |
944 | cmd_name = nvdimm_bus_cmd_name(cmd); | |
e3654eca | 945 | cmd_mask = nd_desc->cmd_mask; |
62232e45 DW |
946 | dimm_name = "bus"; |
947 | } | |
948 | ||
31eca76b DW |
949 | if (cmd == ND_CMD_CALL) { |
950 | if (copy_from_user(&pkg, p, sizeof(pkg))) | |
951 | return -EFAULT; | |
952 | } | |
953 | ||
62232e45 | 954 | if (!desc || (desc->out_num + desc->in_num == 0) || |
e3654eca | 955 | !test_bit(cmd, &cmd_mask)) |
62232e45 DW |
956 | return -ENOTTY; |
957 | ||
958 | /* fail write commands (when read-only) */ | |
959 | if (read_only) | |
07accfa9 JH |
960 | switch (cmd) { |
961 | case ND_CMD_VENDOR: | |
962 | case ND_CMD_SET_CONFIG_DATA: | |
963 | case ND_CMD_ARS_START: | |
d4f32367 | 964 | case ND_CMD_CLEAR_ERROR: |
31eca76b | 965 | case ND_CMD_CALL: |
62232e45 DW |
966 | dev_dbg(&nvdimm_bus->dev, "'%s' command while read-only.\n", |
967 | nvdimm ? nvdimm_cmd_name(cmd) | |
968 | : nvdimm_bus_cmd_name(cmd)); | |
969 | return -EPERM; | |
970 | default: | |
971 | break; | |
972 | } | |
973 | ||
974 | /* process an input envelope */ | |
975 | for (i = 0; i < desc->in_num; i++) { | |
976 | u32 in_size, copy; | |
977 | ||
978 | in_size = nd_cmd_in_size(nvdimm, cmd, desc, i, in_env); | |
979 | if (in_size == UINT_MAX) { | |
980 | dev_err(dev, "%s:%s unknown input size cmd: %s field: %d\n", | |
981 | __func__, dimm_name, cmd_name, i); | |
982 | return -ENXIO; | |
983 | } | |
62232e45 DW |
984 | if (in_len < sizeof(in_env)) |
985 | copy = min_t(u32, sizeof(in_env) - in_len, in_size); | |
986 | else | |
987 | copy = 0; | |
988 | if (copy && copy_from_user(&in_env[in_len], p + in_len, copy)) | |
989 | return -EFAULT; | |
990 | in_len += in_size; | |
991 | } | |
992 | ||
31eca76b | 993 | if (cmd == ND_CMD_CALL) { |
53b85a44 | 994 | func = pkg.nd_command; |
426824d6 DW |
995 | dev_dbg(dev, "%s, idx: %llu, in: %u, out: %u, len %llu\n", |
996 | dimm_name, pkg.nd_command, | |
31eca76b | 997 | in_len, out_len, buf_len); |
31eca76b DW |
998 | } |
999 | ||
62232e45 DW |
1000 | /* process an output envelope */ |
1001 | for (i = 0; i < desc->out_num; i++) { | |
1002 | u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i, | |
efda1b5d | 1003 | (u32 *) in_env, (u32 *) out_env, 0); |
62232e45 DW |
1004 | u32 copy; |
1005 | ||
1006 | if (out_size == UINT_MAX) { | |
426824d6 DW |
1007 | dev_dbg(dev, "%s unknown output size cmd: %s field: %d\n", |
1008 | dimm_name, cmd_name, i); | |
62232e45 DW |
1009 | return -EFAULT; |
1010 | } | |
62232e45 DW |
1011 | if (out_len < sizeof(out_env)) |
1012 | copy = min_t(u32, sizeof(out_env) - out_len, out_size); | |
1013 | else | |
1014 | copy = 0; | |
1015 | if (copy && copy_from_user(&out_env[out_len], | |
1016 | p + in_len + out_len, copy)) | |
1017 | return -EFAULT; | |
1018 | out_len += out_size; | |
1019 | } | |
1020 | ||
58738c49 | 1021 | buf_len = (u64) out_len + (u64) in_len; |
62232e45 | 1022 | if (buf_len > ND_IOCTL_MAX_BUFLEN) { |
426824d6 DW |
1023 | dev_dbg(dev, "%s cmd: %s buf_len: %llu > %d\n", dimm_name, |
1024 | cmd_name, buf_len, ND_IOCTL_MAX_BUFLEN); | |
62232e45 DW |
1025 | return -EINVAL; |
1026 | } | |
1027 | ||
1028 | buf = vmalloc(buf_len); | |
1029 | if (!buf) | |
1030 | return -ENOMEM; | |
1031 | ||
1032 | if (copy_from_user(buf, p, buf_len)) { | |
1033 | rc = -EFAULT; | |
1034 | goto out; | |
1035 | } | |
1036 | ||
eaf96153 | 1037 | nvdimm_bus_lock(&nvdimm_bus->dev); |
53b85a44 | 1038 | rc = nd_cmd_clear_to_send(nvdimm_bus, nvdimm, func, buf); |
eaf96153 DW |
1039 | if (rc) |
1040 | goto out_unlock; | |
1041 | ||
006358b3 | 1042 | rc = nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len, &cmd_rc); |
62232e45 | 1043 | if (rc < 0) |
eaf96153 | 1044 | goto out_unlock; |
006358b3 DJ |
1045 | |
1046 | if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR && cmd_rc >= 0) { | |
1047 | struct nd_cmd_clear_error *clear_err = buf; | |
006358b3 | 1048 | |
23f49844 DW |
1049 | nvdimm_account_cleared_poison(nvdimm_bus, clear_err->address, |
1050 | clear_err->cleared); | |
006358b3 | 1051 | } |
0beb2012 DW |
1052 | nvdimm_bus_unlock(&nvdimm_bus->dev); |
1053 | ||
62232e45 DW |
1054 | if (copy_to_user(p, buf, buf_len)) |
1055 | rc = -EFAULT; | |
0beb2012 DW |
1056 | |
1057 | vfree(buf); | |
1058 | return rc; | |
1059 | ||
eaf96153 DW |
1060 | out_unlock: |
1061 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
62232e45 DW |
1062 | out: |
1063 | vfree(buf); | |
1064 | return rc; | |
1065 | } | |
1066 | ||
45def22c DW |
1067 | static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1068 | { | |
62232e45 | 1069 | long id = (long) file->private_data; |
4dc0e7be | 1070 | int rc = -ENXIO, ro; |
62232e45 DW |
1071 | struct nvdimm_bus *nvdimm_bus; |
1072 | ||
4dc0e7be | 1073 | ro = ((file->f_flags & O_ACCMODE) == O_RDONLY); |
62232e45 DW |
1074 | mutex_lock(&nvdimm_bus_list_mutex); |
1075 | list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) { | |
1076 | if (nvdimm_bus->id == id) { | |
4dc0e7be | 1077 | rc = __nd_ioctl(nvdimm_bus, NULL, ro, cmd, arg); |
62232e45 DW |
1078 | break; |
1079 | } | |
1080 | } | |
1081 | mutex_unlock(&nvdimm_bus_list_mutex); | |
1082 | ||
1083 | return rc; | |
1084 | } | |
1085 | ||
1086 | static int match_dimm(struct device *dev, void *data) | |
1087 | { | |
1088 | long id = (long) data; | |
1089 | ||
1090 | if (is_nvdimm(dev)) { | |
1091 | struct nvdimm *nvdimm = to_nvdimm(dev); | |
1092 | ||
1093 | return nvdimm->id == id; | |
1094 | } | |
1095 | ||
1096 | return 0; | |
1097 | } | |
1098 | ||
1099 | static long nvdimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1100 | { | |
4dc0e7be | 1101 | int rc = -ENXIO, ro; |
62232e45 DW |
1102 | struct nvdimm_bus *nvdimm_bus; |
1103 | ||
4dc0e7be | 1104 | ro = ((file->f_flags & O_ACCMODE) == O_RDONLY); |
62232e45 DW |
1105 | mutex_lock(&nvdimm_bus_list_mutex); |
1106 | list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) { | |
1107 | struct device *dev = device_find_child(&nvdimm_bus->dev, | |
1108 | file->private_data, match_dimm); | |
1109 | struct nvdimm *nvdimm; | |
1110 | ||
1111 | if (!dev) | |
1112 | continue; | |
1113 | ||
1114 | nvdimm = to_nvdimm(dev); | |
4dc0e7be | 1115 | rc = __nd_ioctl(nvdimm_bus, nvdimm, ro, cmd, arg); |
62232e45 DW |
1116 | put_device(dev); |
1117 | break; | |
1118 | } | |
1119 | mutex_unlock(&nvdimm_bus_list_mutex); | |
1120 | ||
1121 | return rc; | |
1122 | } | |
1123 | ||
1124 | static int nd_open(struct inode *inode, struct file *file) | |
1125 | { | |
1126 | long minor = iminor(inode); | |
1127 | ||
1128 | file->private_data = (void *) minor; | |
1129 | return 0; | |
45def22c DW |
1130 | } |
1131 | ||
1132 | static const struct file_operations nvdimm_bus_fops = { | |
1133 | .owner = THIS_MODULE, | |
62232e45 | 1134 | .open = nd_open, |
45def22c DW |
1135 | .unlocked_ioctl = nd_ioctl, |
1136 | .compat_ioctl = nd_ioctl, | |
1137 | .llseek = noop_llseek, | |
1138 | }; | |
1139 | ||
62232e45 DW |
1140 | static const struct file_operations nvdimm_fops = { |
1141 | .owner = THIS_MODULE, | |
1142 | .open = nd_open, | |
1143 | .unlocked_ioctl = nvdimm_ioctl, | |
1144 | .compat_ioctl = nvdimm_ioctl, | |
1145 | .llseek = noop_llseek, | |
1146 | }; | |
1147 | ||
45def22c DW |
1148 | int __init nvdimm_bus_init(void) |
1149 | { | |
1150 | int rc; | |
1151 | ||
e6dfb2de DW |
1152 | rc = bus_register(&nvdimm_bus_type); |
1153 | if (rc) | |
1154 | return rc; | |
1155 | ||
45def22c DW |
1156 | rc = register_chrdev(0, "ndctl", &nvdimm_bus_fops); |
1157 | if (rc < 0) | |
62232e45 | 1158 | goto err_bus_chrdev; |
45def22c DW |
1159 | nvdimm_bus_major = rc; |
1160 | ||
62232e45 DW |
1161 | rc = register_chrdev(0, "dimmctl", &nvdimm_fops); |
1162 | if (rc < 0) | |
1163 | goto err_dimm_chrdev; | |
1164 | nvdimm_major = rc; | |
1165 | ||
45def22c | 1166 | nd_class = class_create(THIS_MODULE, "nd"); |
daa1dee4 AL |
1167 | if (IS_ERR(nd_class)) { |
1168 | rc = PTR_ERR(nd_class); | |
45def22c | 1169 | goto err_class; |
daa1dee4 | 1170 | } |
45def22c | 1171 | |
18515942 DW |
1172 | rc = driver_register(&nd_bus_driver.drv); |
1173 | if (rc) | |
1174 | goto err_nd_bus; | |
1175 | ||
45def22c DW |
1176 | return 0; |
1177 | ||
18515942 DW |
1178 | err_nd_bus: |
1179 | class_destroy(nd_class); | |
45def22c | 1180 | err_class: |
62232e45 DW |
1181 | unregister_chrdev(nvdimm_major, "dimmctl"); |
1182 | err_dimm_chrdev: | |
45def22c | 1183 | unregister_chrdev(nvdimm_bus_major, "ndctl"); |
62232e45 | 1184 | err_bus_chrdev: |
e6dfb2de | 1185 | bus_unregister(&nvdimm_bus_type); |
45def22c DW |
1186 | |
1187 | return rc; | |
1188 | } | |
1189 | ||
4d88a97a | 1190 | void nvdimm_bus_exit(void) |
45def22c | 1191 | { |
18515942 | 1192 | driver_unregister(&nd_bus_driver.drv); |
45def22c DW |
1193 | class_destroy(nd_class); |
1194 | unregister_chrdev(nvdimm_bus_major, "ndctl"); | |
62232e45 | 1195 | unregister_chrdev(nvdimm_major, "dimmctl"); |
e6dfb2de | 1196 | bus_unregister(&nvdimm_bus_type); |
18515942 | 1197 | ida_destroy(&nd_ida); |
45def22c | 1198 | } |