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5b497af4 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
45def22c DW |
2 | /* |
3 | * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. | |
45def22c DW |
4 | */ |
5 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
aa9ad44a | 6 | #include <linux/libnvdimm.h> |
0930a750 | 7 | #include <linux/sched/mm.h> |
62232e45 | 8 | #include <linux/vmalloc.h> |
45def22c | 9 | #include <linux/uaccess.h> |
3d88002e | 10 | #include <linux/module.h> |
8c2f7e86 | 11 | #include <linux/blkdev.h> |
45def22c | 12 | #include <linux/fcntl.h> |
e6dfb2de | 13 | #include <linux/async.h> |
62232e45 | 14 | #include <linux/ndctl.h> |
4d88a97a | 15 | #include <linux/sched.h> |
45def22c | 16 | #include <linux/slab.h> |
af87b9a7 | 17 | #include <linux/cpu.h> |
45def22c DW |
18 | #include <linux/fs.h> |
19 | #include <linux/io.h> | |
62232e45 | 20 | #include <linux/mm.h> |
4d88a97a | 21 | #include <linux/nd.h> |
45def22c | 22 | #include "nd-core.h" |
4d88a97a | 23 | #include "nd.h" |
006358b3 | 24 | #include "pfn.h" |
45def22c | 25 | |
62232e45 | 26 | int nvdimm_major; |
45def22c | 27 | static int nvdimm_bus_major; |
191a9f3a | 28 | static struct class *nd_class; |
18515942 | 29 | static DEFINE_IDA(nd_ida); |
45def22c | 30 | |
2a81ada3 | 31 | static int to_nd_device_type(const struct device *dev) |
4d88a97a DW |
32 | { |
33 | if (is_nvdimm(dev)) | |
34 | return ND_DEVICE_DIMM; | |
c9e582aa | 35 | else if (is_memory(dev)) |
3d88002e | 36 | return ND_DEVICE_REGION_PMEM; |
cd03412a DW |
37 | else if (is_nd_dax(dev)) |
38 | return ND_DEVICE_DAX_PMEM; | |
c9e582aa | 39 | else if (is_nd_region(dev->parent)) |
3d88002e | 40 | return nd_region_to_nstype(to_nd_region(dev->parent)); |
4d88a97a DW |
41 | |
42 | return 0; | |
43 | } | |
44 | ||
2a81ada3 | 45 | static int nvdimm_bus_uevent(const struct device *dev, struct kobj_uevent_env *env) |
4d88a97a DW |
46 | { |
47 | return add_uevent_var(env, "MODALIAS=" ND_DEVICE_MODALIAS_FMT, | |
48 | to_nd_device_type(dev)); | |
49 | } | |
50 | ||
3d88002e DW |
51 | static struct module *to_bus_provider(struct device *dev) |
52 | { | |
53 | /* pin bus providers while regions are enabled */ | |
c9e582aa | 54 | if (is_nd_region(dev)) { |
3d88002e DW |
55 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
56 | ||
bc9775d8 | 57 | return nvdimm_bus->nd_desc->module; |
3d88002e DW |
58 | } |
59 | return NULL; | |
60 | } | |
61 | ||
eaf96153 DW |
62 | static void nvdimm_bus_probe_start(struct nvdimm_bus *nvdimm_bus) |
63 | { | |
64 | nvdimm_bus_lock(&nvdimm_bus->dev); | |
65 | nvdimm_bus->probe_active++; | |
66 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
67 | } | |
68 | ||
69 | static void nvdimm_bus_probe_end(struct nvdimm_bus *nvdimm_bus) | |
70 | { | |
71 | nvdimm_bus_lock(&nvdimm_bus->dev); | |
72 | if (--nvdimm_bus->probe_active == 0) | |
b70d31d0 | 73 | wake_up(&nvdimm_bus->wait); |
eaf96153 DW |
74 | nvdimm_bus_unlock(&nvdimm_bus->dev); |
75 | } | |
76 | ||
4d88a97a DW |
77 | static int nvdimm_bus_probe(struct device *dev) |
78 | { | |
79 | struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver); | |
3d88002e | 80 | struct module *provider = to_bus_provider(dev); |
4d88a97a DW |
81 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
82 | int rc; | |
83 | ||
3d88002e DW |
84 | if (!try_module_get(provider)) |
85 | return -ENXIO; | |
86 | ||
3f46833d DW |
87 | dev_dbg(&nvdimm_bus->dev, "START: %s.probe(%s)\n", |
88 | dev->driver->name, dev_name(dev)); | |
89 | ||
eaf96153 | 90 | nvdimm_bus_probe_start(nvdimm_bus); |
4d88a97a | 91 | rc = nd_drv->probe(dev); |
1c97afa7 AK |
92 | if ((rc == 0 || rc == -EOPNOTSUPP) && |
93 | dev->parent && is_nd_region(dev->parent)) | |
a2d1c7a6 | 94 | nd_region_advance_seeds(to_nd_region(dev->parent), dev); |
eaf96153 DW |
95 | nvdimm_bus_probe_end(nvdimm_bus); |
96 | ||
3f46833d | 97 | dev_dbg(&nvdimm_bus->dev, "END: %s.probe(%s) = %d\n", dev->driver->name, |
4d88a97a | 98 | dev_name(dev), rc); |
8c2f7e86 | 99 | |
3d88002e DW |
100 | if (rc != 0) |
101 | module_put(provider); | |
4d88a97a DW |
102 | return rc; |
103 | } | |
104 | ||
fc7a6209 | 105 | static void nvdimm_bus_remove(struct device *dev) |
4d88a97a DW |
106 | { |
107 | struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver); | |
3d88002e | 108 | struct module *provider = to_bus_provider(dev); |
4d88a97a | 109 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
4d88a97a | 110 | |
81beea55 | 111 | if (nd_drv->remove) |
1f975074 | 112 | nd_drv->remove(dev); |
eaf96153 | 113 | |
1f975074 UKK |
114 | dev_dbg(&nvdimm_bus->dev, "%s.remove(%s)\n", dev->driver->name, |
115 | dev_name(dev)); | |
3d88002e | 116 | module_put(provider); |
4d88a97a DW |
117 | } |
118 | ||
476f848a DW |
119 | static void nvdimm_bus_shutdown(struct device *dev) |
120 | { | |
121 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
122 | struct nd_device_driver *nd_drv = NULL; | |
123 | ||
124 | if (dev->driver) | |
125 | nd_drv = to_nd_device_driver(dev->driver); | |
126 | ||
127 | if (nd_drv && nd_drv->shutdown) { | |
128 | nd_drv->shutdown(dev); | |
129 | dev_dbg(&nvdimm_bus->dev, "%s.shutdown(%s)\n", | |
130 | dev->driver->name, dev_name(dev)); | |
131 | } | |
132 | } | |
133 | ||
71999466 DW |
134 | void nd_device_notify(struct device *dev, enum nvdimm_event event) |
135 | { | |
81beea55 | 136 | device_lock(dev); |
71999466 DW |
137 | if (dev->driver) { |
138 | struct nd_device_driver *nd_drv; | |
139 | ||
140 | nd_drv = to_nd_device_driver(dev->driver); | |
141 | if (nd_drv->notify) | |
142 | nd_drv->notify(dev, event); | |
143 | } | |
81beea55 | 144 | device_unlock(dev); |
71999466 DW |
145 | } |
146 | EXPORT_SYMBOL(nd_device_notify); | |
147 | ||
148 | void nvdimm_region_notify(struct nd_region *nd_region, enum nvdimm_event event) | |
149 | { | |
150 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev); | |
151 | ||
152 | if (!nvdimm_bus) | |
153 | return; | |
154 | ||
155 | /* caller is responsible for holding a reference on the device */ | |
156 | nd_device_notify(&nd_region->dev, event); | |
157 | } | |
158 | EXPORT_SYMBOL_GPL(nvdimm_region_notify); | |
159 | ||
23f49844 DW |
160 | struct clear_badblocks_context { |
161 | resource_size_t phys, cleared; | |
162 | }; | |
163 | ||
164 | static int nvdimm_clear_badblocks_region(struct device *dev, void *data) | |
165 | { | |
166 | struct clear_badblocks_context *ctx = data; | |
167 | struct nd_region *nd_region; | |
168 | resource_size_t ndr_end; | |
169 | sector_t sector; | |
170 | ||
171 | /* make sure device is a region */ | |
c42adf87 | 172 | if (!is_memory(dev)) |
23f49844 DW |
173 | return 0; |
174 | ||
175 | nd_region = to_nd_region(dev); | |
176 | ndr_end = nd_region->ndr_start + nd_region->ndr_size - 1; | |
177 | ||
178 | /* make sure we are in the region */ | |
ef910200 CY |
179 | if (ctx->phys < nd_region->ndr_start || |
180 | (ctx->phys + ctx->cleared - 1) > ndr_end) | |
23f49844 DW |
181 | return 0; |
182 | ||
183 | sector = (ctx->phys - nd_region->ndr_start) / 512; | |
184 | badblocks_clear(&nd_region->bb, sector, ctx->cleared / 512); | |
185 | ||
975750a9 TK |
186 | if (nd_region->bb_state) |
187 | sysfs_notify_dirent(nd_region->bb_state); | |
188 | ||
23f49844 DW |
189 | return 0; |
190 | } | |
191 | ||
192 | static void nvdimm_clear_badblocks_regions(struct nvdimm_bus *nvdimm_bus, | |
193 | phys_addr_t phys, u64 cleared) | |
194 | { | |
195 | struct clear_badblocks_context ctx = { | |
196 | .phys = phys, | |
197 | .cleared = cleared, | |
198 | }; | |
199 | ||
200 | device_for_each_child(&nvdimm_bus->dev, &ctx, | |
201 | nvdimm_clear_badblocks_region); | |
202 | } | |
203 | ||
204 | static void nvdimm_account_cleared_poison(struct nvdimm_bus *nvdimm_bus, | |
205 | phys_addr_t phys, u64 cleared) | |
206 | { | |
207 | if (cleared > 0) | |
aa9ad44a | 208 | badrange_forget(&nvdimm_bus->badrange, phys, cleared); |
23f49844 DW |
209 | |
210 | if (cleared > 0 && cleared / 512) | |
211 | nvdimm_clear_badblocks_regions(nvdimm_bus, phys, cleared); | |
212 | } | |
213 | ||
59e64739 DW |
214 | long nvdimm_clear_poison(struct device *dev, phys_addr_t phys, |
215 | unsigned int len) | |
216 | { | |
217 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
218 | struct nvdimm_bus_descriptor *nd_desc; | |
219 | struct nd_cmd_clear_error clear_err; | |
220 | struct nd_cmd_ars_cap ars_cap; | |
221 | u32 clear_err_unit, mask; | |
0930a750 | 222 | unsigned int noio_flag; |
59e64739 DW |
223 | int cmd_rc, rc; |
224 | ||
225 | if (!nvdimm_bus) | |
226 | return -ENXIO; | |
227 | ||
228 | nd_desc = nvdimm_bus->nd_desc; | |
1e8b8d96 DJ |
229 | /* |
230 | * if ndctl does not exist, it's PMEM_LEGACY and | |
231 | * we want to just pretend everything is handled. | |
232 | */ | |
59e64739 | 233 | if (!nd_desc->ndctl) |
1e8b8d96 | 234 | return len; |
59e64739 DW |
235 | |
236 | memset(&ars_cap, 0, sizeof(ars_cap)); | |
237 | ars_cap.address = phys; | |
238 | ars_cap.length = len; | |
0930a750 | 239 | noio_flag = memalloc_noio_save(); |
59e64739 DW |
240 | rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, &ars_cap, |
241 | sizeof(ars_cap), &cmd_rc); | |
0930a750 | 242 | memalloc_noio_restore(noio_flag); |
59e64739 DW |
243 | if (rc < 0) |
244 | return rc; | |
245 | if (cmd_rc < 0) | |
246 | return cmd_rc; | |
247 | clear_err_unit = ars_cap.clear_err_unit; | |
248 | if (!clear_err_unit || !is_power_of_2(clear_err_unit)) | |
249 | return -ENXIO; | |
250 | ||
251 | mask = clear_err_unit - 1; | |
252 | if ((phys | len) & mask) | |
253 | return -ENXIO; | |
254 | memset(&clear_err, 0, sizeof(clear_err)); | |
255 | clear_err.address = phys; | |
256 | clear_err.length = len; | |
0930a750 | 257 | noio_flag = memalloc_noio_save(); |
59e64739 DW |
258 | rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_CLEAR_ERROR, &clear_err, |
259 | sizeof(clear_err), &cmd_rc); | |
0930a750 | 260 | memalloc_noio_restore(noio_flag); |
59e64739 DW |
261 | if (rc < 0) |
262 | return rc; | |
263 | if (cmd_rc < 0) | |
264 | return cmd_rc; | |
e046114a | 265 | |
23f49844 | 266 | nvdimm_account_cleared_poison(nvdimm_bus, phys, clear_err.cleared); |
8d13c029 | 267 | |
59e64739 DW |
268 | return clear_err.cleared; |
269 | } | |
270 | EXPORT_SYMBOL_GPL(nvdimm_clear_poison); | |
271 | ||
18515942 DW |
272 | static int nvdimm_bus_match(struct device *dev, struct device_driver *drv); |
273 | ||
4d88a97a | 274 | static struct bus_type nvdimm_bus_type = { |
e6dfb2de | 275 | .name = "nd", |
4d88a97a DW |
276 | .uevent = nvdimm_bus_uevent, |
277 | .match = nvdimm_bus_match, | |
278 | .probe = nvdimm_bus_probe, | |
279 | .remove = nvdimm_bus_remove, | |
476f848a | 280 | .shutdown = nvdimm_bus_shutdown, |
4d88a97a DW |
281 | }; |
282 | ||
18515942 DW |
283 | static void nvdimm_bus_release(struct device *dev) |
284 | { | |
285 | struct nvdimm_bus *nvdimm_bus; | |
286 | ||
287 | nvdimm_bus = container_of(dev, struct nvdimm_bus, dev); | |
288 | ida_simple_remove(&nd_ida, nvdimm_bus->id); | |
289 | kfree(nvdimm_bus); | |
290 | } | |
291 | ||
e755799a DW |
292 | static const struct device_type nvdimm_bus_dev_type = { |
293 | .release = nvdimm_bus_release, | |
294 | .groups = nvdimm_bus_attribute_groups, | |
295 | }; | |
296 | ||
87a30e1f | 297 | bool is_nvdimm_bus(struct device *dev) |
18515942 | 298 | { |
e755799a | 299 | return dev->type == &nvdimm_bus_dev_type; |
18515942 DW |
300 | } |
301 | ||
302 | struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev) | |
303 | { | |
304 | struct device *dev; | |
305 | ||
306 | for (dev = nd_dev; dev; dev = dev->parent) | |
307 | if (is_nvdimm_bus(dev)) | |
308 | break; | |
309 | dev_WARN_ONCE(nd_dev, !dev, "invalid dev, not on nd bus\n"); | |
310 | if (dev) | |
311 | return to_nvdimm_bus(dev); | |
312 | return NULL; | |
313 | } | |
314 | ||
315 | struct nvdimm_bus *to_nvdimm_bus(struct device *dev) | |
316 | { | |
317 | struct nvdimm_bus *nvdimm_bus; | |
318 | ||
319 | nvdimm_bus = container_of(dev, struct nvdimm_bus, dev); | |
320 | WARN_ON(!is_nvdimm_bus(dev)); | |
321 | return nvdimm_bus; | |
322 | } | |
323 | EXPORT_SYMBOL_GPL(to_nvdimm_bus); | |
324 | ||
f2989396 DJ |
325 | struct nvdimm_bus *nvdimm_to_bus(struct nvdimm *nvdimm) |
326 | { | |
327 | return to_nvdimm_bus(nvdimm->dev.parent); | |
328 | } | |
329 | EXPORT_SYMBOL_GPL(nvdimm_to_bus); | |
330 | ||
4a0079bc DW |
331 | static struct lock_class_key nvdimm_bus_key; |
332 | ||
18515942 DW |
333 | struct nvdimm_bus *nvdimm_bus_register(struct device *parent, |
334 | struct nvdimm_bus_descriptor *nd_desc) | |
335 | { | |
336 | struct nvdimm_bus *nvdimm_bus; | |
337 | int rc; | |
338 | ||
339 | nvdimm_bus = kzalloc(sizeof(*nvdimm_bus), GFP_KERNEL); | |
340 | if (!nvdimm_bus) | |
341 | return NULL; | |
342 | INIT_LIST_HEAD(&nvdimm_bus->list); | |
343 | INIT_LIST_HEAD(&nvdimm_bus->mapping_list); | |
b70d31d0 | 344 | init_waitqueue_head(&nvdimm_bus->wait); |
18515942 | 345 | nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL); |
18515942 DW |
346 | if (nvdimm_bus->id < 0) { |
347 | kfree(nvdimm_bus); | |
348 | return NULL; | |
349 | } | |
9bf3aa44 OH |
350 | mutex_init(&nvdimm_bus->reconfig_mutex); |
351 | badrange_init(&nvdimm_bus->badrange); | |
18515942 DW |
352 | nvdimm_bus->nd_desc = nd_desc; |
353 | nvdimm_bus->dev.parent = parent; | |
e755799a | 354 | nvdimm_bus->dev.type = &nvdimm_bus_dev_type; |
18515942 DW |
355 | nvdimm_bus->dev.groups = nd_desc->attr_groups; |
356 | nvdimm_bus->dev.bus = &nvdimm_bus_type; | |
1ff19f48 | 357 | nvdimm_bus->dev.of_node = nd_desc->of_node; |
2bbafda4 | 358 | device_initialize(&nvdimm_bus->dev); |
4a0079bc | 359 | lockdep_set_class(&nvdimm_bus->dev.mutex, &nvdimm_bus_key); |
2bbafda4 DW |
360 | device_set_pm_not_required(&nvdimm_bus->dev); |
361 | rc = dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id); | |
362 | if (rc) | |
363 | goto err; | |
364 | ||
365 | rc = device_add(&nvdimm_bus->dev); | |
18515942 DW |
366 | if (rc) { |
367 | dev_dbg(&nvdimm_bus->dev, "registration failed: %d\n", rc); | |
368 | goto err; | |
369 | } | |
370 | ||
371 | return nvdimm_bus; | |
372 | err: | |
373 | put_device(&nvdimm_bus->dev); | |
374 | return NULL; | |
375 | } | |
376 | EXPORT_SYMBOL_GPL(nvdimm_bus_register); | |
377 | ||
378 | void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus) | |
379 | { | |
380 | if (!nvdimm_bus) | |
381 | return; | |
382 | device_unregister(&nvdimm_bus->dev); | |
383 | } | |
384 | EXPORT_SYMBOL_GPL(nvdimm_bus_unregister); | |
385 | ||
386 | static int child_unregister(struct device *dev, void *data) | |
387 | { | |
388 | /* | |
389 | * the singular ndctl class device per bus needs to be | |
390 | * "device_destroy"ed, so skip it here | |
391 | * | |
392 | * i.e. remove classless children | |
393 | */ | |
394 | if (dev->class) | |
7d988097 DJ |
395 | return 0; |
396 | ||
fd14602d DW |
397 | if (is_nvdimm(dev)) |
398 | nvdimm_delete(to_nvdimm(dev)); | |
399 | else | |
400 | nd_device_unregister(dev, ND_SYNC); | |
7d988097 | 401 | |
18515942 DW |
402 | return 0; |
403 | } | |
404 | ||
aa9ad44a | 405 | static void free_badrange_list(struct list_head *badrange_list) |
18515942 | 406 | { |
aa9ad44a | 407 | struct badrange_entry *bre, *next; |
18515942 | 408 | |
aa9ad44a DJ |
409 | list_for_each_entry_safe(bre, next, badrange_list, list) { |
410 | list_del(&bre->list); | |
411 | kfree(bre); | |
18515942 | 412 | } |
aa9ad44a | 413 | list_del_init(badrange_list); |
18515942 DW |
414 | } |
415 | ||
1f975074 | 416 | static void nd_bus_remove(struct device *dev) |
18515942 DW |
417 | { |
418 | struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); | |
419 | ||
420 | mutex_lock(&nvdimm_bus_list_mutex); | |
421 | list_del_init(&nvdimm_bus->list); | |
422 | mutex_unlock(&nvdimm_bus_list_mutex); | |
423 | ||
b70d31d0 DW |
424 | wait_event(nvdimm_bus->wait, |
425 | atomic_read(&nvdimm_bus->ioctl_active) == 0); | |
426 | ||
18515942 DW |
427 | nd_synchronize(); |
428 | device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister); | |
429 | ||
aa9ad44a DJ |
430 | spin_lock(&nvdimm_bus->badrange.lock); |
431 | free_badrange_list(&nvdimm_bus->badrange.list); | |
432 | spin_unlock(&nvdimm_bus->badrange.lock); | |
18515942 DW |
433 | |
434 | nvdimm_bus_destroy_ndctl(nvdimm_bus); | |
18515942 DW |
435 | } |
436 | ||
437 | static int nd_bus_probe(struct device *dev) | |
438 | { | |
439 | struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); | |
440 | int rc; | |
441 | ||
442 | rc = nvdimm_bus_create_ndctl(nvdimm_bus); | |
443 | if (rc) | |
444 | return rc; | |
445 | ||
446 | mutex_lock(&nvdimm_bus_list_mutex); | |
447 | list_add_tail(&nvdimm_bus->list, &nvdimm_bus_list); | |
448 | mutex_unlock(&nvdimm_bus_list_mutex); | |
449 | ||
450 | /* enable bus provider attributes to look up their local context */ | |
451 | dev_set_drvdata(dev, nvdimm_bus->nd_desc); | |
452 | ||
453 | return 0; | |
454 | } | |
455 | ||
456 | static struct nd_device_driver nd_bus_driver = { | |
457 | .probe = nd_bus_probe, | |
458 | .remove = nd_bus_remove, | |
459 | .drv = { | |
460 | .name = "nd_bus", | |
461 | .suppress_bind_attrs = true, | |
462 | .bus = &nvdimm_bus_type, | |
463 | .owner = THIS_MODULE, | |
464 | .mod_name = KBUILD_MODNAME, | |
465 | }, | |
4d88a97a DW |
466 | }; |
467 | ||
18515942 DW |
468 | static int nvdimm_bus_match(struct device *dev, struct device_driver *drv) |
469 | { | |
470 | struct nd_device_driver *nd_drv = to_nd_device_driver(drv); | |
471 | ||
472 | if (is_nvdimm_bus(dev) && nd_drv == &nd_bus_driver) | |
473 | return true; | |
474 | ||
475 | return !!test_bit(to_nd_device_type(dev), &nd_drv->type); | |
476 | } | |
477 | ||
4d88a97a DW |
478 | static ASYNC_DOMAIN_EXCLUSIVE(nd_async_domain); |
479 | ||
480 | void nd_synchronize(void) | |
481 | { | |
482 | async_synchronize_full_domain(&nd_async_domain); | |
483 | } | |
484 | EXPORT_SYMBOL_GPL(nd_synchronize); | |
485 | ||
486 | static void nd_async_device_register(void *d, async_cookie_t cookie) | |
487 | { | |
488 | struct device *dev = d; | |
489 | ||
490 | if (device_add(dev) != 0) { | |
491 | dev_err(dev, "%s: failed\n", __func__); | |
492 | put_device(dev); | |
493 | } | |
494 | put_device(dev); | |
b6eae0f6 AD |
495 | if (dev->parent) |
496 | put_device(dev->parent); | |
4d88a97a DW |
497 | } |
498 | ||
499 | static void nd_async_device_unregister(void *d, async_cookie_t cookie) | |
500 | { | |
501 | struct device *dev = d; | |
502 | ||
0ba1c634 DW |
503 | /* flush bus operations before delete */ |
504 | nvdimm_bus_lock(dev); | |
505 | nvdimm_bus_unlock(dev); | |
506 | ||
4d88a97a DW |
507 | device_unregister(dev); |
508 | put_device(dev); | |
509 | } | |
510 | ||
f57aec44 | 511 | static void __nd_device_register(struct device *dev, bool sync) |
4d88a97a | 512 | { |
cd03412a DW |
513 | if (!dev) |
514 | return; | |
1a091d16 AD |
515 | |
516 | /* | |
517 | * Ensure that region devices always have their NUMA node set as | |
518 | * early as possible. This way we are able to make certain that | |
519 | * any memory associated with the creation and the creation | |
520 | * itself of the region is associated with the correct node. | |
521 | */ | |
522 | if (is_nd_region(dev)) | |
523 | set_dev_node(dev, to_nd_region(dev)->numa_node); | |
524 | ||
4d88a97a | 525 | dev->bus = &nvdimm_bus_type; |
2bbafda4 | 526 | device_set_pm_not_required(dev); |
af87b9a7 | 527 | if (dev->parent) { |
b6eae0f6 | 528 | get_device(dev->parent); |
af87b9a7 AD |
529 | if (dev_to_node(dev) == NUMA_NO_NODE) |
530 | set_dev_node(dev, dev_to_node(dev->parent)); | |
531 | } | |
4d88a97a | 532 | get_device(dev); |
af87b9a7 | 533 | |
f57aec44 DW |
534 | if (sync) |
535 | nd_async_device_register(dev, 0); | |
536 | else | |
537 | async_schedule_dev_domain(nd_async_device_register, dev, | |
538 | &nd_async_domain); | |
539 | } | |
540 | ||
541 | void nd_device_register(struct device *dev) | |
542 | { | |
543 | __nd_device_register(dev, false); | |
4d88a97a DW |
544 | } |
545 | EXPORT_SYMBOL(nd_device_register); | |
546 | ||
f57aec44 DW |
547 | void nd_device_register_sync(struct device *dev) |
548 | { | |
549 | __nd_device_register(dev, true); | |
550 | } | |
551 | ||
4d88a97a DW |
552 | void nd_device_unregister(struct device *dev, enum nd_async_mode mode) |
553 | { | |
8aac0e23 DW |
554 | bool killed; |
555 | ||
4d88a97a DW |
556 | switch (mode) { |
557 | case ND_ASYNC: | |
8aac0e23 DW |
558 | /* |
559 | * In the async case this is being triggered with the | |
560 | * device lock held and the unregistration work needs to | |
561 | * be moved out of line iff this is thread has won the | |
562 | * race to schedule the deletion. | |
563 | */ | |
564 | if (!kill_device(dev)) | |
565 | return; | |
566 | ||
4d88a97a DW |
567 | get_device(dev); |
568 | async_schedule_domain(nd_async_device_unregister, dev, | |
569 | &nd_async_domain); | |
570 | break; | |
571 | case ND_SYNC: | |
8aac0e23 DW |
572 | /* |
573 | * In the sync case the device is being unregistered due | |
574 | * to a state change of the parent. Claim the kill state | |
575 | * to synchronize against other unregistration requests, | |
576 | * or otherwise let the async path handle it if the | |
577 | * unregistration was already queued. | |
578 | */ | |
81beea55 | 579 | device_lock(dev); |
8aac0e23 | 580 | killed = kill_device(dev); |
81beea55 | 581 | device_unlock(dev); |
8aac0e23 DW |
582 | |
583 | if (!killed) | |
584 | return; | |
585 | ||
4d88a97a DW |
586 | nd_synchronize(); |
587 | device_unregister(dev); | |
588 | break; | |
589 | } | |
590 | } | |
591 | EXPORT_SYMBOL(nd_device_unregister); | |
592 | ||
593 | /** | |
594 | * __nd_driver_register() - register a region or a namespace driver | |
595 | * @nd_drv: driver to register | |
596 | * @owner: automatically set by nd_driver_register() macro | |
597 | * @mod_name: automatically set by nd_driver_register() macro | |
598 | */ | |
599 | int __nd_driver_register(struct nd_device_driver *nd_drv, struct module *owner, | |
600 | const char *mod_name) | |
601 | { | |
602 | struct device_driver *drv = &nd_drv->drv; | |
603 | ||
604 | if (!nd_drv->type) { | |
d75f773c | 605 | pr_debug("driver type bitmask not set (%ps)\n", |
4d88a97a DW |
606 | __builtin_return_address(0)); |
607 | return -EINVAL; | |
608 | } | |
609 | ||
6cf9c5ba DW |
610 | if (!nd_drv->probe) { |
611 | pr_debug("%s ->probe() must be specified\n", mod_name); | |
4d88a97a DW |
612 | return -EINVAL; |
613 | } | |
614 | ||
615 | drv->bus = &nvdimm_bus_type; | |
616 | drv->owner = owner; | |
617 | drv->mod_name = mod_name; | |
618 | ||
619 | return driver_register(drv); | |
620 | } | |
621 | EXPORT_SYMBOL(__nd_driver_register); | |
622 | ||
32f61d67 | 623 | void nvdimm_check_and_set_ro(struct gendisk *disk) |
58138820 | 624 | { |
52c44d93 | 625 | struct device *dev = disk_to_dev(disk)->parent; |
58138820 | 626 | struct nd_region *nd_region = to_nd_region(dev->parent); |
254a4cd5 | 627 | int disk_ro = get_disk_ro(disk); |
58138820 | 628 | |
2361db89 DW |
629 | /* catch the disk up with the region ro state */ |
630 | if (disk_ro == nd_region->ro) | |
32f61d67 | 631 | return; |
58138820 | 632 | |
2361db89 DW |
633 | dev_info(dev, "%s read-%s, marking %s read-%s\n", |
634 | dev_name(&nd_region->dev), nd_region->ro ? "only" : "write", | |
635 | disk->disk_name, nd_region->ro ? "only" : "write"); | |
636 | set_disk_ro(disk, nd_region->ro); | |
58138820 | 637 | } |
32f61d67 | 638 | EXPORT_SYMBOL(nvdimm_check_and_set_ro); |
58138820 | 639 | |
4d88a97a DW |
640 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, |
641 | char *buf) | |
642 | { | |
643 | return sprintf(buf, ND_DEVICE_MODALIAS_FMT "\n", | |
644 | to_nd_device_type(dev)); | |
645 | } | |
646 | static DEVICE_ATTR_RO(modalias); | |
647 | ||
648 | static ssize_t devtype_show(struct device *dev, struct device_attribute *attr, | |
649 | char *buf) | |
650 | { | |
651 | return sprintf(buf, "%s\n", dev->type->name); | |
652 | } | |
653 | static DEVICE_ATTR_RO(devtype); | |
654 | ||
655 | static struct attribute *nd_device_attributes[] = { | |
656 | &dev_attr_modalias.attr, | |
657 | &dev_attr_devtype.attr, | |
658 | NULL, | |
659 | }; | |
660 | ||
c01dafad | 661 | /* |
4d88a97a DW |
662 | * nd_device_attribute_group - generic attributes for all devices on an nd bus |
663 | */ | |
adbb6829 | 664 | const struct attribute_group nd_device_attribute_group = { |
4d88a97a | 665 | .attrs = nd_device_attributes, |
e6dfb2de DW |
666 | }; |
667 | ||
74ae66c3 TK |
668 | static ssize_t numa_node_show(struct device *dev, |
669 | struct device_attribute *attr, char *buf) | |
670 | { | |
671 | return sprintf(buf, "%d\n", dev_to_node(dev)); | |
672 | } | |
673 | static DEVICE_ATTR_RO(numa_node); | |
674 | ||
bcba0c45 DW |
675 | static int nvdimm_dev_to_target_node(struct device *dev) |
676 | { | |
677 | struct device *parent = dev->parent; | |
678 | struct nd_region *nd_region = NULL; | |
679 | ||
680 | if (is_nd_region(dev)) | |
681 | nd_region = to_nd_region(dev); | |
682 | else if (parent && is_nd_region(parent)) | |
683 | nd_region = to_nd_region(parent); | |
684 | ||
685 | if (!nd_region) | |
686 | return NUMA_NO_NODE; | |
687 | return nd_region->target_node; | |
688 | } | |
689 | ||
690 | static ssize_t target_node_show(struct device *dev, | |
691 | struct device_attribute *attr, char *buf) | |
692 | { | |
693 | return sprintf(buf, "%d\n", nvdimm_dev_to_target_node(dev)); | |
694 | } | |
695 | static DEVICE_ATTR_RO(target_node); | |
696 | ||
74ae66c3 TK |
697 | static struct attribute *nd_numa_attributes[] = { |
698 | &dev_attr_numa_node.attr, | |
bcba0c45 | 699 | &dev_attr_target_node.attr, |
74ae66c3 TK |
700 | NULL, |
701 | }; | |
702 | ||
703 | static umode_t nd_numa_attr_visible(struct kobject *kobj, struct attribute *a, | |
704 | int n) | |
705 | { | |
bcba0c45 DW |
706 | struct device *dev = container_of(kobj, typeof(*dev), kobj); |
707 | ||
74ae66c3 TK |
708 | if (!IS_ENABLED(CONFIG_NUMA)) |
709 | return 0; | |
710 | ||
bcba0c45 DW |
711 | if (a == &dev_attr_target_node.attr && |
712 | nvdimm_dev_to_target_node(dev) == NUMA_NO_NODE) | |
713 | return 0; | |
714 | ||
74ae66c3 TK |
715 | return a->mode; |
716 | } | |
717 | ||
c01dafad | 718 | /* |
74ae66c3 TK |
719 | * nd_numa_attribute_group - NUMA attributes for all devices on an nd bus |
720 | */ | |
e2f6a0e3 | 721 | const struct attribute_group nd_numa_attribute_group = { |
74ae66c3 TK |
722 | .attrs = nd_numa_attributes, |
723 | .is_visible = nd_numa_attr_visible, | |
724 | }; | |
74ae66c3 | 725 | |
2bbafda4 DW |
726 | static void ndctl_release(struct device *dev) |
727 | { | |
728 | kfree(dev); | |
729 | } | |
730 | ||
4a0079bc DW |
731 | static struct lock_class_key nvdimm_ndctl_key; |
732 | ||
45def22c DW |
733 | int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus) |
734 | { | |
735 | dev_t devt = MKDEV(nvdimm_bus_major, nvdimm_bus->id); | |
736 | struct device *dev; | |
2bbafda4 DW |
737 | int rc; |
738 | ||
739 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
740 | if (!dev) | |
741 | return -ENOMEM; | |
742 | device_initialize(dev); | |
4a0079bc | 743 | lockdep_set_class(&dev->mutex, &nvdimm_ndctl_key); |
2bbafda4 DW |
744 | device_set_pm_not_required(dev); |
745 | dev->class = nd_class; | |
746 | dev->parent = &nvdimm_bus->dev; | |
747 | dev->devt = devt; | |
748 | dev->release = ndctl_release; | |
749 | rc = dev_set_name(dev, "ndctl%d", nvdimm_bus->id); | |
750 | if (rc) | |
751 | goto err; | |
45def22c | 752 | |
2bbafda4 DW |
753 | rc = device_add(dev); |
754 | if (rc) { | |
755 | dev_dbg(&nvdimm_bus->dev, "failed to register ndctl%d: %d\n", | |
756 | nvdimm_bus->id, rc); | |
757 | goto err; | |
758 | } | |
759 | return 0; | |
45def22c | 760 | |
2bbafda4 DW |
761 | err: |
762 | put_device(dev); | |
763 | return rc; | |
45def22c DW |
764 | } |
765 | ||
766 | void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus) | |
767 | { | |
768 | device_destroy(nd_class, MKDEV(nvdimm_bus_major, nvdimm_bus->id)); | |
769 | } | |
770 | ||
62232e45 DW |
771 | static const struct nd_cmd_desc __nd_cmd_dimm_descs[] = { |
772 | [ND_CMD_IMPLEMENTED] = { }, | |
773 | [ND_CMD_SMART] = { | |
774 | .out_num = 2, | |
21129112 | 775 | .out_sizes = { 4, 128, }, |
62232e45 DW |
776 | }, |
777 | [ND_CMD_SMART_THRESHOLD] = { | |
778 | .out_num = 2, | |
779 | .out_sizes = { 4, 8, }, | |
780 | }, | |
781 | [ND_CMD_DIMM_FLAGS] = { | |
782 | .out_num = 2, | |
783 | .out_sizes = { 4, 4 }, | |
784 | }, | |
785 | [ND_CMD_GET_CONFIG_SIZE] = { | |
786 | .out_num = 3, | |
787 | .out_sizes = { 4, 4, 4, }, | |
788 | }, | |
789 | [ND_CMD_GET_CONFIG_DATA] = { | |
790 | .in_num = 2, | |
791 | .in_sizes = { 4, 4, }, | |
792 | .out_num = 2, | |
793 | .out_sizes = { 4, UINT_MAX, }, | |
794 | }, | |
795 | [ND_CMD_SET_CONFIG_DATA] = { | |
796 | .in_num = 3, | |
797 | .in_sizes = { 4, 4, UINT_MAX, }, | |
798 | .out_num = 1, | |
799 | .out_sizes = { 4, }, | |
800 | }, | |
801 | [ND_CMD_VENDOR] = { | |
802 | .in_num = 3, | |
803 | .in_sizes = { 4, 4, UINT_MAX, }, | |
804 | .out_num = 3, | |
805 | .out_sizes = { 4, 4, UINT_MAX, }, | |
806 | }, | |
31eca76b DW |
807 | [ND_CMD_CALL] = { |
808 | .in_num = 2, | |
809 | .in_sizes = { sizeof(struct nd_cmd_pkg), UINT_MAX, }, | |
810 | .out_num = 1, | |
811 | .out_sizes = { UINT_MAX, }, | |
812 | }, | |
62232e45 DW |
813 | }; |
814 | ||
815 | const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd) | |
816 | { | |
817 | if (cmd < ARRAY_SIZE(__nd_cmd_dimm_descs)) | |
818 | return &__nd_cmd_dimm_descs[cmd]; | |
819 | return NULL; | |
820 | } | |
821 | EXPORT_SYMBOL_GPL(nd_cmd_dimm_desc); | |
822 | ||
823 | static const struct nd_cmd_desc __nd_cmd_bus_descs[] = { | |
824 | [ND_CMD_IMPLEMENTED] = { }, | |
825 | [ND_CMD_ARS_CAP] = { | |
826 | .in_num = 2, | |
827 | .in_sizes = { 8, 8, }, | |
4577b066 DW |
828 | .out_num = 4, |
829 | .out_sizes = { 4, 4, 4, 4, }, | |
62232e45 DW |
830 | }, |
831 | [ND_CMD_ARS_START] = { | |
4577b066 DW |
832 | .in_num = 5, |
833 | .in_sizes = { 8, 8, 2, 1, 5, }, | |
834 | .out_num = 2, | |
835 | .out_sizes = { 4, 4, }, | |
62232e45 DW |
836 | }, |
837 | [ND_CMD_ARS_STATUS] = { | |
747ffe11 DW |
838 | .out_num = 3, |
839 | .out_sizes = { 4, 4, UINT_MAX, }, | |
62232e45 | 840 | }, |
d4f32367 DW |
841 | [ND_CMD_CLEAR_ERROR] = { |
842 | .in_num = 2, | |
843 | .in_sizes = { 8, 8, }, | |
844 | .out_num = 3, | |
845 | .out_sizes = { 4, 4, 8, }, | |
846 | }, | |
31eca76b DW |
847 | [ND_CMD_CALL] = { |
848 | .in_num = 2, | |
849 | .in_sizes = { sizeof(struct nd_cmd_pkg), UINT_MAX, }, | |
850 | .out_num = 1, | |
851 | .out_sizes = { UINT_MAX, }, | |
852 | }, | |
62232e45 DW |
853 | }; |
854 | ||
855 | const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd) | |
856 | { | |
857 | if (cmd < ARRAY_SIZE(__nd_cmd_bus_descs)) | |
858 | return &__nd_cmd_bus_descs[cmd]; | |
859 | return NULL; | |
860 | } | |
861 | EXPORT_SYMBOL_GPL(nd_cmd_bus_desc); | |
862 | ||
863 | u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd, | |
864 | const struct nd_cmd_desc *desc, int idx, void *buf) | |
865 | { | |
866 | if (idx >= desc->in_num) | |
867 | return UINT_MAX; | |
868 | ||
869 | if (desc->in_sizes[idx] < UINT_MAX) | |
870 | return desc->in_sizes[idx]; | |
871 | ||
872 | if (nvdimm && cmd == ND_CMD_SET_CONFIG_DATA && idx == 2) { | |
873 | struct nd_cmd_set_config_hdr *hdr = buf; | |
874 | ||
875 | return hdr->in_length; | |
876 | } else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) { | |
877 | struct nd_cmd_vendor_hdr *hdr = buf; | |
878 | ||
879 | return hdr->in_length; | |
31eca76b DW |
880 | } else if (cmd == ND_CMD_CALL) { |
881 | struct nd_cmd_pkg *pkg = buf; | |
882 | ||
883 | return pkg->nd_size_in; | |
62232e45 DW |
884 | } |
885 | ||
886 | return UINT_MAX; | |
887 | } | |
888 | EXPORT_SYMBOL_GPL(nd_cmd_in_size); | |
889 | ||
890 | u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd, | |
891 | const struct nd_cmd_desc *desc, int idx, const u32 *in_field, | |
efda1b5d | 892 | const u32 *out_field, unsigned long remainder) |
62232e45 DW |
893 | { |
894 | if (idx >= desc->out_num) | |
895 | return UINT_MAX; | |
896 | ||
897 | if (desc->out_sizes[idx] < UINT_MAX) | |
898 | return desc->out_sizes[idx]; | |
899 | ||
900 | if (nvdimm && cmd == ND_CMD_GET_CONFIG_DATA && idx == 1) | |
901 | return in_field[1]; | |
902 | else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) | |
903 | return out_field[1]; | |
efda1b5d DW |
904 | else if (!nvdimm && cmd == ND_CMD_ARS_STATUS && idx == 2) { |
905 | /* | |
906 | * Per table 9-276 ARS Data in ACPI 6.1, out_field[1] is | |
907 | * "Size of Output Buffer in bytes, including this | |
908 | * field." | |
909 | */ | |
910 | if (out_field[1] < 4) | |
911 | return 0; | |
912 | /* | |
913 | * ACPI 6.1 is ambiguous if 'status' is included in the | |
914 | * output size. If we encounter an output size that | |
915 | * overshoots the remainder by 4 bytes, assume it was | |
916 | * including 'status'. | |
917 | */ | |
286e8771 | 918 | if (out_field[1] - 4 == remainder) |
efda1b5d | 919 | return remainder; |
286e8771 | 920 | return out_field[1] - 8; |
efda1b5d | 921 | } else if (cmd == ND_CMD_CALL) { |
31eca76b DW |
922 | struct nd_cmd_pkg *pkg = (struct nd_cmd_pkg *) in_field; |
923 | ||
924 | return pkg->nd_size_out; | |
925 | } | |
926 | ||
62232e45 DW |
927 | |
928 | return UINT_MAX; | |
929 | } | |
930 | EXPORT_SYMBOL_GPL(nd_cmd_out_size); | |
931 | ||
bf9bccc1 | 932 | void wait_nvdimm_bus_probe_idle(struct device *dev) |
eaf96153 | 933 | { |
bf9bccc1 DW |
934 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
935 | ||
eaf96153 DW |
936 | do { |
937 | if (nvdimm_bus->probe_active == 0) | |
938 | break; | |
ca6bf264 | 939 | nvdimm_bus_unlock(dev); |
81beea55 | 940 | device_unlock(dev); |
b70d31d0 | 941 | wait_event(nvdimm_bus->wait, |
eaf96153 | 942 | nvdimm_bus->probe_active == 0); |
81beea55 | 943 | device_lock(dev); |
ca6bf264 | 944 | nvdimm_bus_lock(dev); |
eaf96153 DW |
945 | } while (true); |
946 | } | |
947 | ||
006358b3 | 948 | static int nd_pmem_forget_poison_check(struct device *dev, void *data) |
d4f32367 | 949 | { |
006358b3 DJ |
950 | struct nd_cmd_clear_error *clear_err = |
951 | (struct nd_cmd_clear_error *)data; | |
952 | struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL; | |
953 | struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL; | |
954 | struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL; | |
955 | struct nd_namespace_common *ndns = NULL; | |
956 | struct nd_namespace_io *nsio; | |
957 | resource_size_t offset = 0, end_trunc = 0, start, end, pstart, pend; | |
958 | ||
959 | if (nd_dax || !dev->driver) | |
960 | return 0; | |
961 | ||
962 | start = clear_err->address; | |
963 | end = clear_err->address + clear_err->cleared - 1; | |
964 | ||
965 | if (nd_btt || nd_pfn || nd_dax) { | |
966 | if (nd_btt) | |
967 | ndns = nd_btt->ndns; | |
968 | else if (nd_pfn) | |
969 | ndns = nd_pfn->ndns; | |
970 | else if (nd_dax) | |
971 | ndns = nd_dax->nd_pfn.ndns; | |
972 | ||
973 | if (!ndns) | |
974 | return 0; | |
975 | } else | |
976 | ndns = to_ndns(dev); | |
977 | ||
978 | nsio = to_nd_namespace_io(&ndns->dev); | |
979 | pstart = nsio->res.start + offset; | |
980 | pend = nsio->res.end - end_trunc; | |
981 | ||
982 | if ((pstart >= start) && (pend <= end)) | |
d4f32367 | 983 | return -EBUSY; |
006358b3 | 984 | |
d4f32367 | 985 | return 0; |
006358b3 DJ |
986 | |
987 | } | |
988 | ||
989 | static int nd_ns_forget_poison_check(struct device *dev, void *data) | |
990 | { | |
991 | return device_for_each_child(dev, data, nd_pmem_forget_poison_check); | |
d4f32367 DW |
992 | } |
993 | ||
eaf96153 | 994 | /* set_config requires an idle interleave set */ |
87bf572e | 995 | static int nd_cmd_clear_to_send(struct nvdimm_bus *nvdimm_bus, |
006358b3 | 996 | struct nvdimm *nvdimm, unsigned int cmd, void *data) |
eaf96153 | 997 | { |
87bf572e DW |
998 | struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; |
999 | ||
1000 | /* ask the bus provider if it would like to block this request */ | |
1001 | if (nd_desc->clear_to_send) { | |
b3ed2ce0 | 1002 | int rc = nd_desc->clear_to_send(nd_desc, nvdimm, cmd, data); |
87bf572e DW |
1003 | |
1004 | if (rc) | |
1005 | return rc; | |
1006 | } | |
eaf96153 | 1007 | |
d4f32367 DW |
1008 | /* require clear error to go through the pmem driver */ |
1009 | if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR) | |
006358b3 DJ |
1010 | return device_for_each_child(&nvdimm_bus->dev, data, |
1011 | nd_ns_forget_poison_check); | |
d4f32367 | 1012 | |
eaf96153 DW |
1013 | if (!nvdimm || cmd != ND_CMD_SET_CONFIG_DATA) |
1014 | return 0; | |
1015 | ||
87bf572e | 1016 | /* prevent label manipulation while the kernel owns label updates */ |
bf9bccc1 | 1017 | wait_nvdimm_bus_probe_idle(&nvdimm_bus->dev); |
eaf96153 DW |
1018 | if (atomic_read(&nvdimm->busy)) |
1019 | return -EBUSY; | |
1020 | return 0; | |
1021 | } | |
1022 | ||
62232e45 DW |
1023 | static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm, |
1024 | int read_only, unsigned int ioctl_cmd, unsigned long arg) | |
1025 | { | |
1026 | struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; | |
62232e45 DW |
1027 | const struct nd_cmd_desc *desc = NULL; |
1028 | unsigned int cmd = _IOC_NR(ioctl_cmd); | |
62232e45 | 1029 | struct device *dev = &nvdimm_bus->dev; |
58738c49 | 1030 | void __user *p = (void __user *) arg; |
6de5d06e | 1031 | char *out_env = NULL, *in_env = NULL; |
62232e45 | 1032 | const char *cmd_name, *dimm_name; |
58738c49 DW |
1033 | u32 in_len = 0, out_len = 0; |
1034 | unsigned int func = cmd; | |
e3654eca | 1035 | unsigned long cmd_mask; |
58738c49 | 1036 | struct nd_cmd_pkg pkg; |
006358b3 | 1037 | int rc, i, cmd_rc; |
6de5d06e | 1038 | void *buf = NULL; |
58738c49 | 1039 | u64 buf_len = 0; |
62232e45 DW |
1040 | |
1041 | if (nvdimm) { | |
1042 | desc = nd_cmd_dimm_desc(cmd); | |
1043 | cmd_name = nvdimm_cmd_name(cmd); | |
e3654eca | 1044 | cmd_mask = nvdimm->cmd_mask; |
62232e45 DW |
1045 | dimm_name = dev_name(&nvdimm->dev); |
1046 | } else { | |
1047 | desc = nd_cmd_bus_desc(cmd); | |
1048 | cmd_name = nvdimm_bus_cmd_name(cmd); | |
e3654eca | 1049 | cmd_mask = nd_desc->cmd_mask; |
62232e45 DW |
1050 | dimm_name = "bus"; |
1051 | } | |
1052 | ||
92fe2aa8 | 1053 | /* Validate command family support against bus declared support */ |
31eca76b | 1054 | if (cmd == ND_CMD_CALL) { |
92fe2aa8 DW |
1055 | unsigned long *mask; |
1056 | ||
31eca76b DW |
1057 | if (copy_from_user(&pkg, p, sizeof(pkg))) |
1058 | return -EFAULT; | |
92fe2aa8 DW |
1059 | |
1060 | if (nvdimm) { | |
1061 | if (pkg.nd_family > NVDIMM_FAMILY_MAX) | |
1062 | return -EINVAL; | |
1063 | mask = &nd_desc->dimm_family_mask; | |
1064 | } else { | |
1065 | if (pkg.nd_family > NVDIMM_BUS_FAMILY_MAX) | |
1066 | return -EINVAL; | |
1067 | mask = &nd_desc->bus_family_mask; | |
1068 | } | |
1069 | ||
1070 | if (!test_bit(pkg.nd_family, mask)) | |
1071 | return -EINVAL; | |
31eca76b DW |
1072 | } |
1073 | ||
f84afbdd DC |
1074 | if (!desc || |
1075 | (desc->out_num + desc->in_num == 0) || | |
1076 | cmd > ND_CMD_CALL || | |
1077 | !test_bit(cmd, &cmd_mask)) | |
62232e45 DW |
1078 | return -ENOTTY; |
1079 | ||
1080 | /* fail write commands (when read-only) */ | |
1081 | if (read_only) | |
07accfa9 JH |
1082 | switch (cmd) { |
1083 | case ND_CMD_VENDOR: | |
1084 | case ND_CMD_SET_CONFIG_DATA: | |
1085 | case ND_CMD_ARS_START: | |
d4f32367 | 1086 | case ND_CMD_CLEAR_ERROR: |
31eca76b | 1087 | case ND_CMD_CALL: |
ca6bf264 | 1088 | dev_dbg(dev, "'%s' command while read-only.\n", |
62232e45 DW |
1089 | nvdimm ? nvdimm_cmd_name(cmd) |
1090 | : nvdimm_bus_cmd_name(cmd)); | |
1091 | return -EPERM; | |
1092 | default: | |
1093 | break; | |
1094 | } | |
1095 | ||
1096 | /* process an input envelope */ | |
6de5d06e DW |
1097 | in_env = kzalloc(ND_CMD_MAX_ENVELOPE, GFP_KERNEL); |
1098 | if (!in_env) | |
1099 | return -ENOMEM; | |
62232e45 DW |
1100 | for (i = 0; i < desc->in_num; i++) { |
1101 | u32 in_size, copy; | |
1102 | ||
1103 | in_size = nd_cmd_in_size(nvdimm, cmd, desc, i, in_env); | |
1104 | if (in_size == UINT_MAX) { | |
1105 | dev_err(dev, "%s:%s unknown input size cmd: %s field: %d\n", | |
1106 | __func__, dimm_name, cmd_name, i); | |
6de5d06e DW |
1107 | rc = -ENXIO; |
1108 | goto out; | |
62232e45 | 1109 | } |
6de5d06e DW |
1110 | if (in_len < ND_CMD_MAX_ENVELOPE) |
1111 | copy = min_t(u32, ND_CMD_MAX_ENVELOPE - in_len, in_size); | |
62232e45 DW |
1112 | else |
1113 | copy = 0; | |
6de5d06e DW |
1114 | if (copy && copy_from_user(&in_env[in_len], p + in_len, copy)) { |
1115 | rc = -EFAULT; | |
1116 | goto out; | |
1117 | } | |
62232e45 DW |
1118 | in_len += in_size; |
1119 | } | |
1120 | ||
31eca76b | 1121 | if (cmd == ND_CMD_CALL) { |
53b85a44 | 1122 | func = pkg.nd_command; |
426824d6 DW |
1123 | dev_dbg(dev, "%s, idx: %llu, in: %u, out: %u, len %llu\n", |
1124 | dimm_name, pkg.nd_command, | |
31eca76b | 1125 | in_len, out_len, buf_len); |
31eca76b DW |
1126 | } |
1127 | ||
62232e45 | 1128 | /* process an output envelope */ |
6de5d06e DW |
1129 | out_env = kzalloc(ND_CMD_MAX_ENVELOPE, GFP_KERNEL); |
1130 | if (!out_env) { | |
1131 | rc = -ENOMEM; | |
1132 | goto out; | |
1133 | } | |
1134 | ||
62232e45 DW |
1135 | for (i = 0; i < desc->out_num; i++) { |
1136 | u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i, | |
efda1b5d | 1137 | (u32 *) in_env, (u32 *) out_env, 0); |
62232e45 DW |
1138 | u32 copy; |
1139 | ||
1140 | if (out_size == UINT_MAX) { | |
426824d6 DW |
1141 | dev_dbg(dev, "%s unknown output size cmd: %s field: %d\n", |
1142 | dimm_name, cmd_name, i); | |
6de5d06e DW |
1143 | rc = -EFAULT; |
1144 | goto out; | |
62232e45 | 1145 | } |
6de5d06e DW |
1146 | if (out_len < ND_CMD_MAX_ENVELOPE) |
1147 | copy = min_t(u32, ND_CMD_MAX_ENVELOPE - out_len, out_size); | |
62232e45 DW |
1148 | else |
1149 | copy = 0; | |
1150 | if (copy && copy_from_user(&out_env[out_len], | |
6de5d06e DW |
1151 | p + in_len + out_len, copy)) { |
1152 | rc = -EFAULT; | |
1153 | goto out; | |
1154 | } | |
62232e45 DW |
1155 | out_len += out_size; |
1156 | } | |
1157 | ||
58738c49 | 1158 | buf_len = (u64) out_len + (u64) in_len; |
62232e45 | 1159 | if (buf_len > ND_IOCTL_MAX_BUFLEN) { |
426824d6 DW |
1160 | dev_dbg(dev, "%s cmd: %s buf_len: %llu > %d\n", dimm_name, |
1161 | cmd_name, buf_len, ND_IOCTL_MAX_BUFLEN); | |
6de5d06e DW |
1162 | rc = -EINVAL; |
1163 | goto out; | |
62232e45 DW |
1164 | } |
1165 | ||
1166 | buf = vmalloc(buf_len); | |
6de5d06e DW |
1167 | if (!buf) { |
1168 | rc = -ENOMEM; | |
1169 | goto out; | |
1170 | } | |
62232e45 DW |
1171 | |
1172 | if (copy_from_user(buf, p, buf_len)) { | |
1173 | rc = -EFAULT; | |
1174 | goto out; | |
1175 | } | |
1176 | ||
81beea55 | 1177 | device_lock(dev); |
ca6bf264 | 1178 | nvdimm_bus_lock(dev); |
53b85a44 | 1179 | rc = nd_cmd_clear_to_send(nvdimm_bus, nvdimm, func, buf); |
eaf96153 DW |
1180 | if (rc) |
1181 | goto out_unlock; | |
1182 | ||
006358b3 | 1183 | rc = nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len, &cmd_rc); |
62232e45 | 1184 | if (rc < 0) |
eaf96153 | 1185 | goto out_unlock; |
006358b3 DJ |
1186 | |
1187 | if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR && cmd_rc >= 0) { | |
1188 | struct nd_cmd_clear_error *clear_err = buf; | |
006358b3 | 1189 | |
23f49844 DW |
1190 | nvdimm_account_cleared_poison(nvdimm_bus, clear_err->address, |
1191 | clear_err->cleared); | |
006358b3 | 1192 | } |
0beb2012 | 1193 | |
62232e45 DW |
1194 | if (copy_to_user(p, buf, buf_len)) |
1195 | rc = -EFAULT; | |
0beb2012 | 1196 | |
6de5d06e | 1197 | out_unlock: |
ca6bf264 | 1198 | nvdimm_bus_unlock(dev); |
81beea55 | 1199 | device_unlock(dev); |
6de5d06e DW |
1200 | out: |
1201 | kfree(in_env); | |
1202 | kfree(out_env); | |
62232e45 DW |
1203 | vfree(buf); |
1204 | return rc; | |
1205 | } | |
1206 | ||
b70d31d0 DW |
1207 | enum nd_ioctl_mode { |
1208 | BUS_IOCTL, | |
1209 | DIMM_IOCTL, | |
1210 | }; | |
62232e45 DW |
1211 | |
1212 | static int match_dimm(struct device *dev, void *data) | |
1213 | { | |
1214 | long id = (long) data; | |
1215 | ||
1216 | if (is_nvdimm(dev)) { | |
1217 | struct nvdimm *nvdimm = to_nvdimm(dev); | |
1218 | ||
1219 | return nvdimm->id == id; | |
1220 | } | |
1221 | ||
1222 | return 0; | |
1223 | } | |
1224 | ||
b70d31d0 DW |
1225 | static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg, |
1226 | enum nd_ioctl_mode mode) | |
1227 | ||
62232e45 | 1228 | { |
b70d31d0 DW |
1229 | struct nvdimm_bus *nvdimm_bus, *found = NULL; |
1230 | long id = (long) file->private_data; | |
1231 | struct nvdimm *nvdimm = NULL; | |
1232 | int rc, ro; | |
62232e45 | 1233 | |
4dc0e7be | 1234 | ro = ((file->f_flags & O_ACCMODE) == O_RDONLY); |
62232e45 DW |
1235 | mutex_lock(&nvdimm_bus_list_mutex); |
1236 | list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) { | |
b70d31d0 DW |
1237 | if (mode == DIMM_IOCTL) { |
1238 | struct device *dev; | |
1239 | ||
1240 | dev = device_find_child(&nvdimm_bus->dev, | |
1241 | file->private_data, match_dimm); | |
1242 | if (!dev) | |
1243 | continue; | |
1244 | nvdimm = to_nvdimm(dev); | |
1245 | found = nvdimm_bus; | |
1246 | } else if (nvdimm_bus->id == id) { | |
1247 | found = nvdimm_bus; | |
1248 | } | |
62232e45 | 1249 | |
b70d31d0 DW |
1250 | if (found) { |
1251 | atomic_inc(&nvdimm_bus->ioctl_active); | |
1252 | break; | |
1253 | } | |
62232e45 DW |
1254 | } |
1255 | mutex_unlock(&nvdimm_bus_list_mutex); | |
1256 | ||
b70d31d0 DW |
1257 | if (!found) |
1258 | return -ENXIO; | |
1259 | ||
1260 | nvdimm_bus = found; | |
1261 | rc = __nd_ioctl(nvdimm_bus, nvdimm, ro, cmd, arg); | |
1262 | ||
1263 | if (nvdimm) | |
1264 | put_device(&nvdimm->dev); | |
1265 | if (atomic_dec_and_test(&nvdimm_bus->ioctl_active)) | |
1266 | wake_up(&nvdimm_bus->wait); | |
1267 | ||
62232e45 DW |
1268 | return rc; |
1269 | } | |
1270 | ||
b70d31d0 DW |
1271 | static long bus_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1272 | { | |
1273 | return nd_ioctl(file, cmd, arg, BUS_IOCTL); | |
1274 | } | |
1275 | ||
1276 | static long dimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1277 | { | |
1278 | return nd_ioctl(file, cmd, arg, DIMM_IOCTL); | |
1279 | } | |
1280 | ||
62232e45 DW |
1281 | static int nd_open(struct inode *inode, struct file *file) |
1282 | { | |
1283 | long minor = iminor(inode); | |
1284 | ||
1285 | file->private_data = (void *) minor; | |
1286 | return 0; | |
45def22c DW |
1287 | } |
1288 | ||
1289 | static const struct file_operations nvdimm_bus_fops = { | |
1290 | .owner = THIS_MODULE, | |
62232e45 | 1291 | .open = nd_open, |
b70d31d0 | 1292 | .unlocked_ioctl = bus_ioctl, |
1832f2d8 | 1293 | .compat_ioctl = compat_ptr_ioctl, |
45def22c DW |
1294 | .llseek = noop_llseek, |
1295 | }; | |
1296 | ||
62232e45 DW |
1297 | static const struct file_operations nvdimm_fops = { |
1298 | .owner = THIS_MODULE, | |
1299 | .open = nd_open, | |
b70d31d0 | 1300 | .unlocked_ioctl = dimm_ioctl, |
1832f2d8 | 1301 | .compat_ioctl = compat_ptr_ioctl, |
62232e45 DW |
1302 | .llseek = noop_llseek, |
1303 | }; | |
1304 | ||
45def22c DW |
1305 | int __init nvdimm_bus_init(void) |
1306 | { | |
1307 | int rc; | |
1308 | ||
e6dfb2de DW |
1309 | rc = bus_register(&nvdimm_bus_type); |
1310 | if (rc) | |
1311 | return rc; | |
1312 | ||
45def22c DW |
1313 | rc = register_chrdev(0, "ndctl", &nvdimm_bus_fops); |
1314 | if (rc < 0) | |
62232e45 | 1315 | goto err_bus_chrdev; |
45def22c DW |
1316 | nvdimm_bus_major = rc; |
1317 | ||
62232e45 DW |
1318 | rc = register_chrdev(0, "dimmctl", &nvdimm_fops); |
1319 | if (rc < 0) | |
1320 | goto err_dimm_chrdev; | |
1321 | nvdimm_major = rc; | |
1322 | ||
1aaba11d | 1323 | nd_class = class_create("nd"); |
daa1dee4 AL |
1324 | if (IS_ERR(nd_class)) { |
1325 | rc = PTR_ERR(nd_class); | |
45def22c | 1326 | goto err_class; |
daa1dee4 | 1327 | } |
45def22c | 1328 | |
18515942 DW |
1329 | rc = driver_register(&nd_bus_driver.drv); |
1330 | if (rc) | |
1331 | goto err_nd_bus; | |
1332 | ||
45def22c DW |
1333 | return 0; |
1334 | ||
18515942 DW |
1335 | err_nd_bus: |
1336 | class_destroy(nd_class); | |
45def22c | 1337 | err_class: |
62232e45 DW |
1338 | unregister_chrdev(nvdimm_major, "dimmctl"); |
1339 | err_dimm_chrdev: | |
45def22c | 1340 | unregister_chrdev(nvdimm_bus_major, "ndctl"); |
62232e45 | 1341 | err_bus_chrdev: |
e6dfb2de | 1342 | bus_unregister(&nvdimm_bus_type); |
45def22c DW |
1343 | |
1344 | return rc; | |
1345 | } | |
1346 | ||
4d88a97a | 1347 | void nvdimm_bus_exit(void) |
45def22c | 1348 | { |
18515942 | 1349 | driver_unregister(&nd_bus_driver.drv); |
45def22c DW |
1350 | class_destroy(nd_class); |
1351 | unregister_chrdev(nvdimm_bus_major, "ndctl"); | |
62232e45 | 1352 | unregister_chrdev(nvdimm_major, "dimmctl"); |
e6dfb2de | 1353 | bus_unregister(&nvdimm_bus_type); |
18515942 | 1354 | ida_destroy(&nd_ida); |
45def22c | 1355 | } |