1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. |
4 | */ |
5 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
6 | #include <linux/libnvdimm.h> |
7 | #include <linux/sched/mm.h> |
8 | #include <linux/vmalloc.h> |
9 | #include <linux/uaccess.h> |
10 | #include <linux/module.h> |
11 | #include <linux/blkdev.h> |
12 | #include <linux/fcntl.h> |
13 | #include <linux/async.h> |
14 | #include <linux/ndctl.h> |
15 | #include <linux/sched.h> |
16 | #include <linux/slab.h> |
17 | #include <linux/cpu.h> |
18 | #include <linux/fs.h> |
19 | #include <linux/io.h> |
20 | #include <linux/mm.h> |
21 | #include <linux/nd.h> |
22 | #include "nd-core.h" |
23 | #include "nd.h" |
24 | #include "pfn.h" |
25 | |
26 | int nvdimm_major; |
27 | static int nvdimm_bus_major; |
28 | static struct class *nd_class; |
29 | static DEFINE_IDA(nd_ida); |
30 | |
31 | static int to_nd_device_type(const struct device *dev) |
32 | { |
33 | if (is_nvdimm(dev)) |
34 | return ND_DEVICE_DIMM; |
35 | else if (is_memory(dev)) |
36 | return ND_DEVICE_REGION_PMEM; |
37 | else if (is_nd_dax(dev)) |
38 | return ND_DEVICE_DAX_PMEM; |
39 | else if (is_nd_region(dev: dev->parent)) |
40 | return nd_region_to_nstype(nd_region: to_nd_region(dev: dev->parent)); |
41 | |
42 | return 0; |
43 | } |
44 | |
45 | static int nvdimm_bus_uevent(const struct device *dev, struct kobj_uevent_env *env) |
46 | { |
47 | return add_uevent_var(env, format: "MODALIAS=" ND_DEVICE_MODALIAS_FMT, |
48 | to_nd_device_type(dev)); |
49 | } |
50 | |
51 | static struct module *to_bus_provider(struct device *dev) |
52 | { |
53 | /* pin bus providers while regions are enabled */ |
54 | if (is_nd_region(dev)) { |
55 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(nd_dev: dev); |
56 | |
57 | return nvdimm_bus->nd_desc->module; |
58 | } |
59 | return NULL; |
60 | } |
61 | |
62 | static void nvdimm_bus_probe_start(struct nvdimm_bus *nvdimm_bus) |
63 | { |
64 | nvdimm_bus_lock(dev: &nvdimm_bus->dev); |
65 | nvdimm_bus->probe_active++; |
66 | nvdimm_bus_unlock(dev: &nvdimm_bus->dev); |
67 | } |
68 | |
69 | static void nvdimm_bus_probe_end(struct nvdimm_bus *nvdimm_bus) |
70 | { |
71 | nvdimm_bus_lock(dev: &nvdimm_bus->dev); |
72 | if (--nvdimm_bus->probe_active == 0) |
73 | wake_up(&nvdimm_bus->wait); |
74 | nvdimm_bus_unlock(dev: &nvdimm_bus->dev); |
75 | } |
76 | |
77 | static int nvdimm_bus_probe(struct device *dev) |
78 | { |
79 | struct nd_device_driver *nd_drv = to_nd_device_driver(drv: dev->driver); |
80 | struct module *provider = to_bus_provider(dev); |
81 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(nd_dev: dev); |
82 | int rc; |
83 | |
84 | if (!try_module_get(module: provider)) |
85 | return -ENXIO; |
86 | |
87 | dev_dbg(&nvdimm_bus->dev, "START: %s.probe(%s)\n" , |
88 | dev->driver->name, dev_name(dev)); |
89 | |
90 | nvdimm_bus_probe_start(nvdimm_bus); |
91 | rc = nd_drv->probe(dev); |
92 | if ((rc == 0 || rc == -EOPNOTSUPP) && |
93 | dev->parent && is_nd_region(dev: dev->parent)) |
94 | nd_region_advance_seeds(nd_region: to_nd_region(dev: dev->parent), dev); |
95 | nvdimm_bus_probe_end(nvdimm_bus); |
96 | |
97 | dev_dbg(&nvdimm_bus->dev, "END: %s.probe(%s) = %d\n" , dev->driver->name, |
98 | dev_name(dev), rc); |
99 | |
100 | if (rc != 0) |
101 | module_put(module: provider); |
102 | return rc; |
103 | } |
104 | |
105 | static void nvdimm_bus_remove(struct device *dev) |
106 | { |
107 | struct nd_device_driver *nd_drv = to_nd_device_driver(drv: dev->driver); |
108 | struct module *provider = to_bus_provider(dev); |
109 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(nd_dev: dev); |
110 | |
111 | if (nd_drv->remove) |
112 | nd_drv->remove(dev); |
113 | |
114 | dev_dbg(&nvdimm_bus->dev, "%s.remove(%s)\n" , dev->driver->name, |
115 | dev_name(dev)); |
116 | module_put(module: provider); |
117 | } |
118 | |
119 | static void nvdimm_bus_shutdown(struct device *dev) |
120 | { |
121 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(nd_dev: dev); |
122 | struct nd_device_driver *nd_drv = NULL; |
123 | |
124 | if (dev->driver) |
125 | nd_drv = to_nd_device_driver(drv: 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 | |
134 | void nd_device_notify(struct device *dev, enum nvdimm_event event) |
135 | { |
136 | device_lock(dev); |
137 | if (dev->driver) { |
138 | struct nd_device_driver *nd_drv; |
139 | |
140 | nd_drv = to_nd_device_driver(drv: dev->driver); |
141 | if (nd_drv->notify) |
142 | nd_drv->notify(dev, event); |
143 | } |
144 | device_unlock(dev); |
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_dev: &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 | |
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 */ |
172 | if (!is_memory(dev)) |
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 */ |
179 | if (ctx->phys < nd_region->ndr_start || |
180 | (ctx->phys + ctx->cleared - 1) > ndr_end) |
181 | return 0; |
182 | |
183 | sector = (ctx->phys - nd_region->ndr_start) / 512; |
184 | badblocks_clear(bb: &nd_region->bb, s: sector, sectors: ctx->cleared / 512); |
185 | |
186 | if (nd_region->bb_state) |
187 | sysfs_notify_dirent(kn: nd_region->bb_state); |
188 | |
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(dev: &nvdimm_bus->dev, data: &ctx, |
201 | fn: 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) |
208 | badrange_forget(badrange: &nvdimm_bus->badrange, start: phys, len: cleared); |
209 | |
210 | if (cleared > 0 && cleared / 512) |
211 | nvdimm_clear_badblocks_regions(nvdimm_bus, phys, cleared); |
212 | } |
213 | |
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(nd_dev: 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; |
222 | unsigned int noio_flag; |
223 | int cmd_rc, rc; |
224 | |
225 | if (!nvdimm_bus) |
226 | return -ENXIO; |
227 | |
228 | nd_desc = nvdimm_bus->nd_desc; |
229 | /* |
230 | * if ndctl does not exist, it's PMEM_LEGACY and |
231 | * we want to just pretend everything is handled. |
232 | */ |
233 | if (!nd_desc->ndctl) |
234 | return len; |
235 | |
236 | memset(&ars_cap, 0, sizeof(ars_cap)); |
237 | ars_cap.address = phys; |
238 | ars_cap.length = len; |
239 | noio_flag = memalloc_noio_save(); |
240 | rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, &ars_cap, |
241 | sizeof(ars_cap), &cmd_rc); |
242 | memalloc_noio_restore(flags: noio_flag); |
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(n: 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; |
257 | noio_flag = memalloc_noio_save(); |
258 | rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_CLEAR_ERROR, &clear_err, |
259 | sizeof(clear_err), &cmd_rc); |
260 | memalloc_noio_restore(flags: noio_flag); |
261 | if (rc < 0) |
262 | return rc; |
263 | if (cmd_rc < 0) |
264 | return cmd_rc; |
265 | |
266 | nvdimm_account_cleared_poison(nvdimm_bus, phys, cleared: clear_err.cleared); |
267 | |
268 | return clear_err.cleared; |
269 | } |
270 | EXPORT_SYMBOL_GPL(nvdimm_clear_poison); |
271 | |
272 | static int nvdimm_bus_match(struct device *dev, struct device_driver *drv); |
273 | |
274 | static const struct bus_type nvdimm_bus_type = { |
275 | .name = "nd" , |
276 | .uevent = nvdimm_bus_uevent, |
277 | .match = nvdimm_bus_match, |
278 | .probe = nvdimm_bus_probe, |
279 | .remove = nvdimm_bus_remove, |
280 | .shutdown = nvdimm_bus_shutdown, |
281 | }; |
282 | |
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_free(&nd_ida, id: nvdimm_bus->id); |
289 | kfree(objp: nvdimm_bus); |
290 | } |
291 | |
292 | static const struct device_type nvdimm_bus_dev_type = { |
293 | .release = nvdimm_bus_release, |
294 | .groups = nvdimm_bus_attribute_groups, |
295 | }; |
296 | |
297 | bool is_nvdimm_bus(struct device *dev) |
298 | { |
299 | return dev->type == &nvdimm_bus_dev_type; |
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 | |
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 | |
331 | static struct lock_class_key nvdimm_bus_key; |
332 | |
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(size: sizeof(*nvdimm_bus), GFP_KERNEL); |
340 | if (!nvdimm_bus) |
341 | return NULL; |
342 | INIT_LIST_HEAD(list: &nvdimm_bus->list); |
343 | INIT_LIST_HEAD(list: &nvdimm_bus->mapping_list); |
344 | init_waitqueue_head(&nvdimm_bus->wait); |
345 | nvdimm_bus->id = ida_alloc(ida: &nd_ida, GFP_KERNEL); |
346 | if (nvdimm_bus->id < 0) { |
347 | kfree(objp: nvdimm_bus); |
348 | return NULL; |
349 | } |
350 | mutex_init(&nvdimm_bus->reconfig_mutex); |
351 | badrange_init(badrange: &nvdimm_bus->badrange); |
352 | nvdimm_bus->nd_desc = nd_desc; |
353 | nvdimm_bus->dev.parent = parent; |
354 | nvdimm_bus->dev.type = &nvdimm_bus_dev_type; |
355 | nvdimm_bus->dev.groups = nd_desc->attr_groups; |
356 | nvdimm_bus->dev.bus = &nvdimm_bus_type; |
357 | nvdimm_bus->dev.of_node = nd_desc->of_node; |
358 | device_initialize(dev: &nvdimm_bus->dev); |
359 | lockdep_set_class(&nvdimm_bus->dev.mutex, &nvdimm_bus_key); |
360 | device_set_pm_not_required(dev: &nvdimm_bus->dev); |
361 | rc = dev_set_name(dev: &nvdimm_bus->dev, name: "ndbus%d" , nvdimm_bus->id); |
362 | if (rc) |
363 | goto err; |
364 | |
365 | rc = device_add(dev: &nvdimm_bus->dev); |
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(dev: &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(dev: &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) |
395 | return 0; |
396 | |
397 | if (is_nvdimm(dev)) |
398 | nvdimm_delete(nvdimm: to_nvdimm(dev)); |
399 | else |
400 | nd_device_unregister(dev, mode: ND_SYNC); |
401 | |
402 | return 0; |
403 | } |
404 | |
405 | static void free_badrange_list(struct list_head *badrange_list) |
406 | { |
407 | struct badrange_entry *bre, *next; |
408 | |
409 | list_for_each_entry_safe(bre, next, badrange_list, list) { |
410 | list_del(entry: &bre->list); |
411 | kfree(objp: bre); |
412 | } |
413 | list_del_init(entry: badrange_list); |
414 | } |
415 | |
416 | static void nd_bus_remove(struct device *dev) |
417 | { |
418 | struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); |
419 | |
420 | mutex_lock(&nvdimm_bus_list_mutex); |
421 | list_del_init(entry: &nvdimm_bus->list); |
422 | mutex_unlock(lock: &nvdimm_bus_list_mutex); |
423 | |
424 | wait_event(nvdimm_bus->wait, |
425 | atomic_read(&nvdimm_bus->ioctl_active) == 0); |
426 | |
427 | nd_synchronize(); |
428 | device_for_each_child(dev: &nvdimm_bus->dev, NULL, fn: child_unregister); |
429 | |
430 | spin_lock(lock: &nvdimm_bus->badrange.lock); |
431 | free_badrange_list(badrange_list: &nvdimm_bus->badrange.list); |
432 | spin_unlock(lock: &nvdimm_bus->badrange.lock); |
433 | |
434 | nvdimm_bus_destroy_ndctl(nvdimm_bus); |
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(new: &nvdimm_bus->list, head: &nvdimm_bus_list); |
448 | mutex_unlock(lock: &nvdimm_bus_list_mutex); |
449 | |
450 | /* enable bus provider attributes to look up their local context */ |
451 | dev_set_drvdata(dev, data: 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 | }, |
466 | }; |
467 | |
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 | |
478 | static ASYNC_DOMAIN_EXCLUSIVE(nd_async_domain); |
479 | |
480 | void nd_synchronize(void) |
481 | { |
482 | async_synchronize_full_domain(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); |
495 | if (dev->parent) |
496 | put_device(dev: dev->parent); |
497 | } |
498 | |
499 | static void nd_async_device_unregister(void *d, async_cookie_t cookie) |
500 | { |
501 | struct device *dev = d; |
502 | |
503 | /* flush bus operations before delete */ |
504 | nvdimm_bus_lock(dev); |
505 | nvdimm_bus_unlock(dev); |
506 | |
507 | device_unregister(dev); |
508 | put_device(dev); |
509 | } |
510 | |
511 | static void __nd_device_register(struct device *dev, bool sync) |
512 | { |
513 | if (!dev) |
514 | return; |
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, node: to_nd_region(dev)->numa_node); |
524 | |
525 | dev->bus = &nvdimm_bus_type; |
526 | device_set_pm_not_required(dev); |
527 | if (dev->parent) { |
528 | get_device(dev: dev->parent); |
529 | if (dev_to_node(dev) == NUMA_NO_NODE) |
530 | set_dev_node(dev, node: dev_to_node(dev: dev->parent)); |
531 | } |
532 | get_device(dev); |
533 | |
534 | if (sync) |
535 | nd_async_device_register(d: dev, cookie: 0); |
536 | else |
537 | async_schedule_dev_domain(func: nd_async_device_register, dev, |
538 | domain: &nd_async_domain); |
539 | } |
540 | |
541 | void nd_device_register(struct device *dev) |
542 | { |
543 | __nd_device_register(dev, sync: false); |
544 | } |
545 | EXPORT_SYMBOL(nd_device_register); |
546 | |
547 | void nd_device_register_sync(struct device *dev) |
548 | { |
549 | __nd_device_register(dev, sync: true); |
550 | } |
551 | |
552 | void nd_device_unregister(struct device *dev, enum nd_async_mode mode) |
553 | { |
554 | bool killed; |
555 | |
556 | switch (mode) { |
557 | case ND_ASYNC: |
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 | |
567 | get_device(dev); |
568 | async_schedule_domain(func: nd_async_device_unregister, data: dev, |
569 | domain: &nd_async_domain); |
570 | break; |
571 | case ND_SYNC: |
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 | */ |
579 | device_lock(dev); |
580 | killed = kill_device(dev); |
581 | device_unlock(dev); |
582 | |
583 | if (!killed) |
584 | return; |
585 | |
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) { |
605 | pr_debug("driver type bitmask not set (%ps)\n" , |
606 | __builtin_return_address(0)); |
607 | return -EINVAL; |
608 | } |
609 | |
610 | if (!nd_drv->probe) { |
611 | pr_debug("%s ->probe() must be specified\n" , mod_name); |
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 | |
623 | void nvdimm_check_and_set_ro(struct gendisk *disk) |
624 | { |
625 | struct device *dev = disk_to_dev(disk)->parent; |
626 | struct nd_region *nd_region = to_nd_region(dev: dev->parent); |
627 | int disk_ro = get_disk_ro(disk); |
628 | |
629 | /* catch the disk up with the region ro state */ |
630 | if (disk_ro == nd_region->ro) |
631 | return; |
632 | |
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, read_only: nd_region->ro); |
637 | } |
638 | EXPORT_SYMBOL(nvdimm_check_and_set_ro); |
639 | |
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, fmt: "%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 | |
661 | /* |
662 | * nd_device_attribute_group - generic attributes for all devices on an nd bus |
663 | */ |
664 | const struct attribute_group nd_device_attribute_group = { |
665 | .attrs = nd_device_attributes, |
666 | }; |
667 | |
668 | static ssize_t numa_node_show(struct device *dev, |
669 | struct device_attribute *attr, char *buf) |
670 | { |
671 | return sprintf(buf, fmt: "%d\n" , dev_to_node(dev)); |
672 | } |
673 | static DEVICE_ATTR_RO(numa_node); |
674 | |
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(dev: parent)) |
683 | nd_region = to_nd_region(dev: 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, fmt: "%d\n" , nvdimm_dev_to_target_node(dev)); |
694 | } |
695 | static DEVICE_ATTR_RO(target_node); |
696 | |
697 | static struct attribute *nd_numa_attributes[] = { |
698 | &dev_attr_numa_node.attr, |
699 | &dev_attr_target_node.attr, |
700 | NULL, |
701 | }; |
702 | |
703 | static umode_t nd_numa_attr_visible(struct kobject *kobj, struct attribute *a, |
704 | int n) |
705 | { |
706 | struct device *dev = container_of(kobj, typeof(*dev), kobj); |
707 | |
708 | if (!IS_ENABLED(CONFIG_NUMA)) |
709 | return 0; |
710 | |
711 | if (a == &dev_attr_target_node.attr && |
712 | nvdimm_dev_to_target_node(dev) == NUMA_NO_NODE) |
713 | return 0; |
714 | |
715 | return a->mode; |
716 | } |
717 | |
718 | /* |
719 | * nd_numa_attribute_group - NUMA attributes for all devices on an nd bus |
720 | */ |
721 | const struct attribute_group nd_numa_attribute_group = { |
722 | .attrs = nd_numa_attributes, |
723 | .is_visible = nd_numa_attr_visible, |
724 | }; |
725 | |
726 | static void ndctl_release(struct device *dev) |
727 | { |
728 | kfree(objp: dev); |
729 | } |
730 | |
731 | static struct lock_class_key nvdimm_ndctl_key; |
732 | |
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; |
737 | int rc; |
738 | |
739 | dev = kzalloc(size: sizeof(*dev), GFP_KERNEL); |
740 | if (!dev) |
741 | return -ENOMEM; |
742 | device_initialize(dev); |
743 | lockdep_set_class(&dev->mutex, &nvdimm_ndctl_key); |
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, name: "ndctl%d" , nvdimm_bus->id); |
750 | if (rc) |
751 | goto err; |
752 | |
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; |
760 | |
761 | err: |
762 | put_device(dev); |
763 | return rc; |
764 | } |
765 | |
766 | void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus) |
767 | { |
768 | device_destroy(cls: nd_class, MKDEV(nvdimm_bus_major, nvdimm_bus->id)); |
769 | } |
770 | |
771 | static const struct nd_cmd_desc __nd_cmd_dimm_descs[] = { |
772 | [ND_CMD_IMPLEMENTED] = { }, |
773 | [ND_CMD_SMART] = { |
774 | .out_num = 2, |
775 | .out_sizes = { 4, 128, }, |
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 | }, |
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 | }, |
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, }, |
828 | .out_num = 4, |
829 | .out_sizes = { 4, 4, 4, 4, }, |
830 | }, |
831 | [ND_CMD_ARS_START] = { |
832 | .in_num = 5, |
833 | .in_sizes = { 8, 8, 2, 1, 5, }, |
834 | .out_num = 2, |
835 | .out_sizes = { 4, 4, }, |
836 | }, |
837 | [ND_CMD_ARS_STATUS] = { |
838 | .out_num = 3, |
839 | .out_sizes = { 4, 4, UINT_MAX, }, |
840 | }, |
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 | }, |
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 | }, |
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; |
880 | } else if (cmd == ND_CMD_CALL) { |
881 | struct nd_cmd_pkg *pkg = buf; |
882 | |
883 | return pkg->nd_size_in; |
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, |
892 | const u32 *out_field, unsigned long remainder) |
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]; |
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 | */ |
918 | if (out_field[1] - 4 == remainder) |
919 | return remainder; |
920 | return out_field[1] - 8; |
921 | } else if (cmd == ND_CMD_CALL) { |
922 | struct nd_cmd_pkg *pkg = (struct nd_cmd_pkg *) in_field; |
923 | |
924 | return pkg->nd_size_out; |
925 | } |
926 | |
927 | |
928 | return UINT_MAX; |
929 | } |
930 | EXPORT_SYMBOL_GPL(nd_cmd_out_size); |
931 | |
932 | void wait_nvdimm_bus_probe_idle(struct device *dev) |
933 | { |
934 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(nd_dev: dev); |
935 | |
936 | do { |
937 | if (nvdimm_bus->probe_active == 0) |
938 | break; |
939 | nvdimm_bus_unlock(dev); |
940 | device_unlock(dev); |
941 | wait_event(nvdimm_bus->wait, |
942 | nvdimm_bus->probe_active == 0); |
943 | device_lock(dev); |
944 | nvdimm_bus_lock(dev); |
945 | } while (true); |
946 | } |
947 | |
948 | static int nd_pmem_forget_poison_check(struct device *dev, void *data) |
949 | { |
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(dev: &ndns->dev); |
979 | pstart = nsio->res.start + offset; |
980 | pend = nsio->res.end - end_trunc; |
981 | |
982 | if ((pstart >= start) && (pend <= end)) |
983 | return -EBUSY; |
984 | |
985 | return 0; |
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, fn: nd_pmem_forget_poison_check); |
992 | } |
993 | |
994 | /* set_config requires an idle interleave set */ |
995 | static int nd_cmd_clear_to_send(struct nvdimm_bus *nvdimm_bus, |
996 | struct nvdimm *nvdimm, unsigned int cmd, void *data) |
997 | { |
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) { |
1002 | int rc = nd_desc->clear_to_send(nd_desc, nvdimm, cmd, data); |
1003 | |
1004 | if (rc) |
1005 | return rc; |
1006 | } |
1007 | |
1008 | /* require clear error to go through the pmem driver */ |
1009 | if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR) |
1010 | return device_for_each_child(dev: &nvdimm_bus->dev, data, |
1011 | fn: nd_ns_forget_poison_check); |
1012 | |
1013 | if (!nvdimm || cmd != ND_CMD_SET_CONFIG_DATA) |
1014 | return 0; |
1015 | |
1016 | /* prevent label manipulation while the kernel owns label updates */ |
1017 | wait_nvdimm_bus_probe_idle(dev: &nvdimm_bus->dev); |
1018 | if (atomic_read(v: &nvdimm->busy)) |
1019 | return -EBUSY; |
1020 | return 0; |
1021 | } |
1022 | |
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; |
1027 | const struct nd_cmd_desc *desc = NULL; |
1028 | unsigned int cmd = _IOC_NR(ioctl_cmd); |
1029 | struct device *dev = &nvdimm_bus->dev; |
1030 | void __user *p = (void __user *) arg; |
1031 | char *out_env = NULL, *in_env = NULL; |
1032 | const char *cmd_name, *dimm_name; |
1033 | u32 in_len = 0, out_len = 0; |
1034 | unsigned int func = cmd; |
1035 | unsigned long cmd_mask; |
1036 | struct nd_cmd_pkg pkg; |
1037 | int rc, i, cmd_rc; |
1038 | void *buf = NULL; |
1039 | u64 buf_len = 0; |
1040 | |
1041 | if (nvdimm) { |
1042 | desc = nd_cmd_dimm_desc(cmd); |
1043 | cmd_name = nvdimm_cmd_name(cmd); |
1044 | cmd_mask = nvdimm->cmd_mask; |
1045 | dimm_name = dev_name(dev: &nvdimm->dev); |
1046 | } else { |
1047 | desc = nd_cmd_bus_desc(cmd); |
1048 | cmd_name = nvdimm_bus_cmd_name(cmd); |
1049 | cmd_mask = nd_desc->cmd_mask; |
1050 | dimm_name = "bus" ; |
1051 | } |
1052 | |
1053 | /* Validate command family support against bus declared support */ |
1054 | if (cmd == ND_CMD_CALL) { |
1055 | unsigned long *mask; |
1056 | |
1057 | if (copy_from_user(to: &pkg, from: p, n: sizeof(pkg))) |
1058 | return -EFAULT; |
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; |
1072 | } |
1073 | |
1074 | if (!desc || |
1075 | (desc->out_num + desc->in_num == 0) || |
1076 | cmd > ND_CMD_CALL || |
1077 | !test_bit(cmd, &cmd_mask)) |
1078 | return -ENOTTY; |
1079 | |
1080 | /* fail write commands (when read-only) */ |
1081 | if (read_only) |
1082 | switch (cmd) { |
1083 | case ND_CMD_VENDOR: |
1084 | case ND_CMD_SET_CONFIG_DATA: |
1085 | case ND_CMD_ARS_START: |
1086 | case ND_CMD_CLEAR_ERROR: |
1087 | case ND_CMD_CALL: |
1088 | dev_dbg(dev, "'%s' command while read-only.\n" , |
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 */ |
1097 | in_env = kzalloc(size: ND_CMD_MAX_ENVELOPE, GFP_KERNEL); |
1098 | if (!in_env) |
1099 | return -ENOMEM; |
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); |
1107 | rc = -ENXIO; |
1108 | goto out; |
1109 | } |
1110 | if (in_len < ND_CMD_MAX_ENVELOPE) |
1111 | copy = min_t(u32, ND_CMD_MAX_ENVELOPE - in_len, in_size); |
1112 | else |
1113 | copy = 0; |
1114 | if (copy && copy_from_user(to: &in_env[in_len], from: p + in_len, n: copy)) { |
1115 | rc = -EFAULT; |
1116 | goto out; |
1117 | } |
1118 | in_len += in_size; |
1119 | } |
1120 | |
1121 | if (cmd == ND_CMD_CALL) { |
1122 | func = pkg.nd_command; |
1123 | dev_dbg(dev, "%s, idx: %llu, in: %u, out: %u, len %llu\n" , |
1124 | dimm_name, pkg.nd_command, |
1125 | in_len, out_len, buf_len); |
1126 | } |
1127 | |
1128 | /* process an output envelope */ |
1129 | out_env = kzalloc(size: ND_CMD_MAX_ENVELOPE, GFP_KERNEL); |
1130 | if (!out_env) { |
1131 | rc = -ENOMEM; |
1132 | goto out; |
1133 | } |
1134 | |
1135 | for (i = 0; i < desc->out_num; i++) { |
1136 | u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i, |
1137 | (u32 *) in_env, (u32 *) out_env, 0); |
1138 | u32 copy; |
1139 | |
1140 | if (out_size == UINT_MAX) { |
1141 | dev_dbg(dev, "%s unknown output size cmd: %s field: %d\n" , |
1142 | dimm_name, cmd_name, i); |
1143 | rc = -EFAULT; |
1144 | goto out; |
1145 | } |
1146 | if (out_len < ND_CMD_MAX_ENVELOPE) |
1147 | copy = min_t(u32, ND_CMD_MAX_ENVELOPE - out_len, out_size); |
1148 | else |
1149 | copy = 0; |
1150 | if (copy && copy_from_user(to: &out_env[out_len], |
1151 | from: p + in_len + out_len, n: copy)) { |
1152 | rc = -EFAULT; |
1153 | goto out; |
1154 | } |
1155 | out_len += out_size; |
1156 | } |
1157 | |
1158 | buf_len = (u64) out_len + (u64) in_len; |
1159 | if (buf_len > ND_IOCTL_MAX_BUFLEN) { |
1160 | dev_dbg(dev, "%s cmd: %s buf_len: %llu > %d\n" , dimm_name, |
1161 | cmd_name, buf_len, ND_IOCTL_MAX_BUFLEN); |
1162 | rc = -EINVAL; |
1163 | goto out; |
1164 | } |
1165 | |
1166 | buf = vmalloc(size: buf_len); |
1167 | if (!buf) { |
1168 | rc = -ENOMEM; |
1169 | goto out; |
1170 | } |
1171 | |
1172 | if (copy_from_user(to: buf, from: p, n: buf_len)) { |
1173 | rc = -EFAULT; |
1174 | goto out; |
1175 | } |
1176 | |
1177 | device_lock(dev); |
1178 | nvdimm_bus_lock(dev); |
1179 | rc = nd_cmd_clear_to_send(nvdimm_bus, nvdimm, cmd: func, data: buf); |
1180 | if (rc) |
1181 | goto out_unlock; |
1182 | |
1183 | rc = nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len, &cmd_rc); |
1184 | if (rc < 0) |
1185 | goto out_unlock; |
1186 | |
1187 | if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR && cmd_rc >= 0) { |
1188 | struct nd_cmd_clear_error *clear_err = buf; |
1189 | |
1190 | nvdimm_account_cleared_poison(nvdimm_bus, phys: clear_err->address, |
1191 | cleared: clear_err->cleared); |
1192 | } |
1193 | |
1194 | if (copy_to_user(to: p, from: buf, n: buf_len)) |
1195 | rc = -EFAULT; |
1196 | |
1197 | out_unlock: |
1198 | nvdimm_bus_unlock(dev); |
1199 | device_unlock(dev); |
1200 | out: |
1201 | kfree(objp: in_env); |
1202 | kfree(objp: out_env); |
1203 | vfree(addr: buf); |
1204 | return rc; |
1205 | } |
1206 | |
1207 | enum nd_ioctl_mode { |
1208 | BUS_IOCTL, |
1209 | DIMM_IOCTL, |
1210 | }; |
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 | |
1225 | static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg, |
1226 | enum nd_ioctl_mode mode) |
1227 | |
1228 | { |
1229 | struct nvdimm_bus *nvdimm_bus, *found = NULL; |
1230 | long id = (long) file->private_data; |
1231 | struct nvdimm *nvdimm = NULL; |
1232 | int rc, ro; |
1233 | |
1234 | ro = ((file->f_flags & O_ACCMODE) == O_RDONLY); |
1235 | mutex_lock(&nvdimm_bus_list_mutex); |
1236 | list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) { |
1237 | if (mode == DIMM_IOCTL) { |
1238 | struct device *dev; |
1239 | |
1240 | dev = device_find_child(dev: &nvdimm_bus->dev, |
1241 | data: file->private_data, match: 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 | } |
1249 | |
1250 | if (found) { |
1251 | atomic_inc(v: &nvdimm_bus->ioctl_active); |
1252 | break; |
1253 | } |
1254 | } |
1255 | mutex_unlock(lock: &nvdimm_bus_list_mutex); |
1256 | |
1257 | if (!found) |
1258 | return -ENXIO; |
1259 | |
1260 | nvdimm_bus = found; |
1261 | rc = __nd_ioctl(nvdimm_bus, nvdimm, read_only: ro, ioctl_cmd: cmd, arg); |
1262 | |
1263 | if (nvdimm) |
1264 | put_device(dev: &nvdimm->dev); |
1265 | if (atomic_dec_and_test(v: &nvdimm_bus->ioctl_active)) |
1266 | wake_up(&nvdimm_bus->wait); |
1267 | |
1268 | return rc; |
1269 | } |
1270 | |
1271 | static long bus_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1272 | { |
1273 | return nd_ioctl(file, cmd, arg, mode: 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, mode: DIMM_IOCTL); |
1279 | } |
1280 | |
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; |
1287 | } |
1288 | |
1289 | static const struct file_operations nvdimm_bus_fops = { |
1290 | .owner = THIS_MODULE, |
1291 | .open = nd_open, |
1292 | .unlocked_ioctl = bus_ioctl, |
1293 | .compat_ioctl = compat_ptr_ioctl, |
1294 | .llseek = noop_llseek, |
1295 | }; |
1296 | |
1297 | static const struct file_operations nvdimm_fops = { |
1298 | .owner = THIS_MODULE, |
1299 | .open = nd_open, |
1300 | .unlocked_ioctl = dimm_ioctl, |
1301 | .compat_ioctl = compat_ptr_ioctl, |
1302 | .llseek = noop_llseek, |
1303 | }; |
1304 | |
1305 | int __init nvdimm_bus_init(void) |
1306 | { |
1307 | int rc; |
1308 | |
1309 | rc = bus_register(bus: &nvdimm_bus_type); |
1310 | if (rc) |
1311 | return rc; |
1312 | |
1313 | rc = register_chrdev(major: 0, name: "ndctl" , fops: &nvdimm_bus_fops); |
1314 | if (rc < 0) |
1315 | goto err_bus_chrdev; |
1316 | nvdimm_bus_major = rc; |
1317 | |
1318 | rc = register_chrdev(major: 0, name: "dimmctl" , fops: &nvdimm_fops); |
1319 | if (rc < 0) |
1320 | goto err_dimm_chrdev; |
1321 | nvdimm_major = rc; |
1322 | |
1323 | nd_class = class_create(name: "nd" ); |
1324 | if (IS_ERR(ptr: nd_class)) { |
1325 | rc = PTR_ERR(ptr: nd_class); |
1326 | goto err_class; |
1327 | } |
1328 | |
1329 | rc = driver_register(drv: &nd_bus_driver.drv); |
1330 | if (rc) |
1331 | goto err_nd_bus; |
1332 | |
1333 | return 0; |
1334 | |
1335 | err_nd_bus: |
1336 | class_destroy(cls: nd_class); |
1337 | err_class: |
1338 | unregister_chrdev(major: nvdimm_major, name: "dimmctl" ); |
1339 | err_dimm_chrdev: |
1340 | unregister_chrdev(major: nvdimm_bus_major, name: "ndctl" ); |
1341 | err_bus_chrdev: |
1342 | bus_unregister(bus: &nvdimm_bus_type); |
1343 | |
1344 | return rc; |
1345 | } |
1346 | |
1347 | void nvdimm_bus_exit(void) |
1348 | { |
1349 | driver_unregister(drv: &nd_bus_driver.drv); |
1350 | class_destroy(cls: nd_class); |
1351 | unregister_chrdev(major: nvdimm_bus_major, name: "ndctl" ); |
1352 | unregister_chrdev(major: nvdimm_major, name: "dimmctl" ); |
1353 | bus_unregister(bus: &nvdimm_bus_type); |
1354 | ida_destroy(ida: &nd_ida); |
1355 | } |
1356 | |