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45def22c DW |
1 | /* |
2 | * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | */ | |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
4bda1599 | 14 | #include <linux/sched/mm.h> |
62232e45 | 15 | #include <linux/vmalloc.h> |
45def22c | 16 | #include <linux/uaccess.h> |
3d88002e | 17 | #include <linux/module.h> |
8c2f7e86 | 18 | #include <linux/blkdev.h> |
45def22c | 19 | #include <linux/fcntl.h> |
e6dfb2de | 20 | #include <linux/async.h> |
8c2f7e86 | 21 | #include <linux/genhd.h> |
62232e45 | 22 | #include <linux/ndctl.h> |
4d88a97a | 23 | #include <linux/sched.h> |
45def22c DW |
24 | #include <linux/slab.h> |
25 | #include <linux/fs.h> | |
26 | #include <linux/io.h> | |
62232e45 | 27 | #include <linux/mm.h> |
4d88a97a | 28 | #include <linux/nd.h> |
45def22c | 29 | #include "nd-core.h" |
4d88a97a | 30 | #include "nd.h" |
006358b3 | 31 | #include "pfn.h" |
45def22c | 32 | |
62232e45 | 33 | int nvdimm_major; |
45def22c DW |
34 | static int nvdimm_bus_major; |
35 | static struct class *nd_class; | |
18515942 | 36 | static DEFINE_IDA(nd_ida); |
45def22c | 37 | |
4d88a97a DW |
38 | static int to_nd_device_type(struct device *dev) |
39 | { | |
40 | if (is_nvdimm(dev)) | |
41 | return ND_DEVICE_DIMM; | |
c9e582aa | 42 | else if (is_memory(dev)) |
3d88002e DW |
43 | return ND_DEVICE_REGION_PMEM; |
44 | else if (is_nd_blk(dev)) | |
45 | return ND_DEVICE_REGION_BLK; | |
cd03412a DW |
46 | else if (is_nd_dax(dev)) |
47 | return ND_DEVICE_DAX_PMEM; | |
c9e582aa | 48 | else if (is_nd_region(dev->parent)) |
3d88002e | 49 | return nd_region_to_nstype(to_nd_region(dev->parent)); |
4d88a97a DW |
50 | |
51 | return 0; | |
52 | } | |
53 | ||
54 | static int nvdimm_bus_uevent(struct device *dev, struct kobj_uevent_env *env) | |
55 | { | |
41d7a6d6 TK |
56 | /* |
57 | * Ensure that region devices always have their numa node set as | |
58 | * early as possible. | |
59 | */ | |
c9e582aa | 60 | if (is_nd_region(dev)) |
41d7a6d6 | 61 | set_dev_node(dev, to_nd_region(dev)->numa_node); |
4d88a97a DW |
62 | return add_uevent_var(env, "MODALIAS=" ND_DEVICE_MODALIAS_FMT, |
63 | to_nd_device_type(dev)); | |
64 | } | |
65 | ||
3d88002e DW |
66 | static struct module *to_bus_provider(struct device *dev) |
67 | { | |
68 | /* pin bus providers while regions are enabled */ | |
c9e582aa | 69 | if (is_nd_region(dev)) { |
3d88002e DW |
70 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
71 | ||
bc9775d8 | 72 | return nvdimm_bus->nd_desc->module; |
3d88002e DW |
73 | } |
74 | return NULL; | |
75 | } | |
76 | ||
eaf96153 DW |
77 | static void nvdimm_bus_probe_start(struct nvdimm_bus *nvdimm_bus) |
78 | { | |
79 | nvdimm_bus_lock(&nvdimm_bus->dev); | |
80 | nvdimm_bus->probe_active++; | |
81 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
82 | } | |
83 | ||
84 | static void nvdimm_bus_probe_end(struct nvdimm_bus *nvdimm_bus) | |
85 | { | |
86 | nvdimm_bus_lock(&nvdimm_bus->dev); | |
87 | if (--nvdimm_bus->probe_active == 0) | |
88 | wake_up(&nvdimm_bus->probe_wait); | |
89 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
90 | } | |
91 | ||
4d88a97a DW |
92 | static int nvdimm_bus_probe(struct device *dev) |
93 | { | |
94 | struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver); | |
3d88002e | 95 | struct module *provider = to_bus_provider(dev); |
4d88a97a DW |
96 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
97 | int rc; | |
98 | ||
3d88002e DW |
99 | if (!try_module_get(provider)) |
100 | return -ENXIO; | |
101 | ||
eaf96153 | 102 | nvdimm_bus_probe_start(nvdimm_bus); |
4d88a97a | 103 | rc = nd_drv->probe(dev); |
eaf96153 DW |
104 | if (rc == 0) |
105 | nd_region_probe_success(nvdimm_bus, dev); | |
bf9bccc1 DW |
106 | else |
107 | nd_region_disable(nvdimm_bus, dev); | |
eaf96153 DW |
108 | nvdimm_bus_probe_end(nvdimm_bus); |
109 | ||
4d88a97a DW |
110 | dev_dbg(&nvdimm_bus->dev, "%s.probe(%s) = %d\n", dev->driver->name, |
111 | dev_name(dev), rc); | |
8c2f7e86 | 112 | |
3d88002e DW |
113 | if (rc != 0) |
114 | module_put(provider); | |
4d88a97a DW |
115 | return rc; |
116 | } | |
117 | ||
118 | static int nvdimm_bus_remove(struct device *dev) | |
119 | { | |
120 | struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver); | |
3d88002e | 121 | struct module *provider = to_bus_provider(dev); |
4d88a97a | 122 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
6cf9c5ba | 123 | int rc = 0; |
4d88a97a | 124 | |
6cf9c5ba DW |
125 | if (nd_drv->remove) |
126 | rc = nd_drv->remove(dev); | |
eaf96153 DW |
127 | nd_region_disable(nvdimm_bus, dev); |
128 | ||
4d88a97a DW |
129 | dev_dbg(&nvdimm_bus->dev, "%s.remove(%s) = %d\n", dev->driver->name, |
130 | dev_name(dev), rc); | |
3d88002e | 131 | module_put(provider); |
4d88a97a DW |
132 | return rc; |
133 | } | |
134 | ||
476f848a DW |
135 | static void nvdimm_bus_shutdown(struct device *dev) |
136 | { | |
137 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
138 | struct nd_device_driver *nd_drv = NULL; | |
139 | ||
140 | if (dev->driver) | |
141 | nd_drv = to_nd_device_driver(dev->driver); | |
142 | ||
143 | if (nd_drv && nd_drv->shutdown) { | |
144 | nd_drv->shutdown(dev); | |
145 | dev_dbg(&nvdimm_bus->dev, "%s.shutdown(%s)\n", | |
146 | dev->driver->name, dev_name(dev)); | |
147 | } | |
148 | } | |
149 | ||
71999466 DW |
150 | void nd_device_notify(struct device *dev, enum nvdimm_event event) |
151 | { | |
152 | device_lock(dev); | |
153 | if (dev->driver) { | |
154 | struct nd_device_driver *nd_drv; | |
155 | ||
156 | nd_drv = to_nd_device_driver(dev->driver); | |
157 | if (nd_drv->notify) | |
158 | nd_drv->notify(dev, event); | |
159 | } | |
160 | device_unlock(dev); | |
161 | } | |
162 | EXPORT_SYMBOL(nd_device_notify); | |
163 | ||
164 | void nvdimm_region_notify(struct nd_region *nd_region, enum nvdimm_event event) | |
165 | { | |
166 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev); | |
167 | ||
168 | if (!nvdimm_bus) | |
169 | return; | |
170 | ||
171 | /* caller is responsible for holding a reference on the device */ | |
172 | nd_device_notify(&nd_region->dev, event); | |
173 | } | |
174 | EXPORT_SYMBOL_GPL(nvdimm_region_notify); | |
175 | ||
23f49844 DW |
176 | struct clear_badblocks_context { |
177 | resource_size_t phys, cleared; | |
178 | }; | |
179 | ||
180 | static int nvdimm_clear_badblocks_region(struct device *dev, void *data) | |
181 | { | |
182 | struct clear_badblocks_context *ctx = data; | |
183 | struct nd_region *nd_region; | |
184 | resource_size_t ndr_end; | |
185 | sector_t sector; | |
186 | ||
187 | /* make sure device is a region */ | |
188 | if (!is_nd_pmem(dev)) | |
189 | return 0; | |
190 | ||
191 | nd_region = to_nd_region(dev); | |
192 | ndr_end = nd_region->ndr_start + nd_region->ndr_size - 1; | |
193 | ||
194 | /* make sure we are in the region */ | |
195 | if (ctx->phys < nd_region->ndr_start | |
196 | || (ctx->phys + ctx->cleared) > ndr_end) | |
197 | return 0; | |
198 | ||
199 | sector = (ctx->phys - nd_region->ndr_start) / 512; | |
200 | badblocks_clear(&nd_region->bb, sector, ctx->cleared / 512); | |
201 | ||
975750a9 TK |
202 | if (nd_region->bb_state) |
203 | sysfs_notify_dirent(nd_region->bb_state); | |
204 | ||
23f49844 DW |
205 | return 0; |
206 | } | |
207 | ||
208 | static void nvdimm_clear_badblocks_regions(struct nvdimm_bus *nvdimm_bus, | |
209 | phys_addr_t phys, u64 cleared) | |
210 | { | |
211 | struct clear_badblocks_context ctx = { | |
212 | .phys = phys, | |
213 | .cleared = cleared, | |
214 | }; | |
215 | ||
216 | device_for_each_child(&nvdimm_bus->dev, &ctx, | |
217 | nvdimm_clear_badblocks_region); | |
218 | } | |
219 | ||
220 | static void nvdimm_account_cleared_poison(struct nvdimm_bus *nvdimm_bus, | |
221 | phys_addr_t phys, u64 cleared) | |
222 | { | |
223 | if (cleared > 0) | |
224 | nvdimm_forget_poison(nvdimm_bus, phys, cleared); | |
225 | ||
226 | if (cleared > 0 && cleared / 512) | |
227 | nvdimm_clear_badblocks_regions(nvdimm_bus, phys, cleared); | |
228 | } | |
229 | ||
59e64739 DW |
230 | long nvdimm_clear_poison(struct device *dev, phys_addr_t phys, |
231 | unsigned int len) | |
232 | { | |
233 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
234 | struct nvdimm_bus_descriptor *nd_desc; | |
235 | struct nd_cmd_clear_error clear_err; | |
236 | struct nd_cmd_ars_cap ars_cap; | |
237 | u32 clear_err_unit, mask; | |
4bda1599 | 238 | unsigned int noio_flag; |
59e64739 DW |
239 | int cmd_rc, rc; |
240 | ||
241 | if (!nvdimm_bus) | |
242 | return -ENXIO; | |
243 | ||
244 | nd_desc = nvdimm_bus->nd_desc; | |
1e8b8d96 DJ |
245 | /* |
246 | * if ndctl does not exist, it's PMEM_LEGACY and | |
247 | * we want to just pretend everything is handled. | |
248 | */ | |
59e64739 | 249 | if (!nd_desc->ndctl) |
1e8b8d96 | 250 | return len; |
59e64739 DW |
251 | |
252 | memset(&ars_cap, 0, sizeof(ars_cap)); | |
253 | ars_cap.address = phys; | |
254 | ars_cap.length = len; | |
4bda1599 | 255 | noio_flag = memalloc_noio_save(); |
59e64739 DW |
256 | rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, &ars_cap, |
257 | sizeof(ars_cap), &cmd_rc); | |
4bda1599 | 258 | memalloc_noio_restore(noio_flag); |
59e64739 DW |
259 | if (rc < 0) |
260 | return rc; | |
261 | if (cmd_rc < 0) | |
262 | return cmd_rc; | |
263 | clear_err_unit = ars_cap.clear_err_unit; | |
264 | if (!clear_err_unit || !is_power_of_2(clear_err_unit)) | |
265 | return -ENXIO; | |
266 | ||
267 | mask = clear_err_unit - 1; | |
268 | if ((phys | len) & mask) | |
269 | return -ENXIO; | |
270 | memset(&clear_err, 0, sizeof(clear_err)); | |
271 | clear_err.address = phys; | |
272 | clear_err.length = len; | |
4bda1599 | 273 | noio_flag = memalloc_noio_save(); |
59e64739 DW |
274 | rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_CLEAR_ERROR, &clear_err, |
275 | sizeof(clear_err), &cmd_rc); | |
4bda1599 | 276 | memalloc_noio_restore(noio_flag); |
59e64739 DW |
277 | if (rc < 0) |
278 | return rc; | |
279 | if (cmd_rc < 0) | |
280 | return cmd_rc; | |
e046114a | 281 | |
23f49844 | 282 | nvdimm_account_cleared_poison(nvdimm_bus, phys, clear_err.cleared); |
8d13c029 | 283 | |
59e64739 DW |
284 | return clear_err.cleared; |
285 | } | |
286 | EXPORT_SYMBOL_GPL(nvdimm_clear_poison); | |
287 | ||
18515942 DW |
288 | static int nvdimm_bus_match(struct device *dev, struct device_driver *drv); |
289 | ||
4d88a97a | 290 | static struct bus_type nvdimm_bus_type = { |
e6dfb2de | 291 | .name = "nd", |
4d88a97a DW |
292 | .uevent = nvdimm_bus_uevent, |
293 | .match = nvdimm_bus_match, | |
294 | .probe = nvdimm_bus_probe, | |
295 | .remove = nvdimm_bus_remove, | |
476f848a | 296 | .shutdown = nvdimm_bus_shutdown, |
4d88a97a DW |
297 | }; |
298 | ||
18515942 DW |
299 | static void nvdimm_bus_release(struct device *dev) |
300 | { | |
301 | struct nvdimm_bus *nvdimm_bus; | |
302 | ||
303 | nvdimm_bus = container_of(dev, struct nvdimm_bus, dev); | |
304 | ida_simple_remove(&nd_ida, nvdimm_bus->id); | |
305 | kfree(nvdimm_bus); | |
306 | } | |
307 | ||
308 | static bool is_nvdimm_bus(struct device *dev) | |
309 | { | |
310 | return dev->release == nvdimm_bus_release; | |
311 | } | |
312 | ||
313 | struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev) | |
314 | { | |
315 | struct device *dev; | |
316 | ||
317 | for (dev = nd_dev; dev; dev = dev->parent) | |
318 | if (is_nvdimm_bus(dev)) | |
319 | break; | |
320 | dev_WARN_ONCE(nd_dev, !dev, "invalid dev, not on nd bus\n"); | |
321 | if (dev) | |
322 | return to_nvdimm_bus(dev); | |
323 | return NULL; | |
324 | } | |
325 | ||
326 | struct nvdimm_bus *to_nvdimm_bus(struct device *dev) | |
327 | { | |
328 | struct nvdimm_bus *nvdimm_bus; | |
329 | ||
330 | nvdimm_bus = container_of(dev, struct nvdimm_bus, dev); | |
331 | WARN_ON(!is_nvdimm_bus(dev)); | |
332 | return nvdimm_bus; | |
333 | } | |
334 | EXPORT_SYMBOL_GPL(to_nvdimm_bus); | |
335 | ||
336 | struct nvdimm_bus *nvdimm_bus_register(struct device *parent, | |
337 | struct nvdimm_bus_descriptor *nd_desc) | |
338 | { | |
339 | struct nvdimm_bus *nvdimm_bus; | |
340 | int rc; | |
341 | ||
342 | nvdimm_bus = kzalloc(sizeof(*nvdimm_bus), GFP_KERNEL); | |
343 | if (!nvdimm_bus) | |
344 | return NULL; | |
345 | INIT_LIST_HEAD(&nvdimm_bus->list); | |
346 | INIT_LIST_HEAD(&nvdimm_bus->mapping_list); | |
347 | INIT_LIST_HEAD(&nvdimm_bus->poison_list); | |
348 | init_waitqueue_head(&nvdimm_bus->probe_wait); | |
349 | nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL); | |
350 | mutex_init(&nvdimm_bus->reconfig_mutex); | |
b3b454f6 | 351 | spin_lock_init(&nvdimm_bus->poison_lock); |
18515942 DW |
352 | if (nvdimm_bus->id < 0) { |
353 | kfree(nvdimm_bus); | |
354 | return NULL; | |
355 | } | |
356 | nvdimm_bus->nd_desc = nd_desc; | |
357 | nvdimm_bus->dev.parent = parent; | |
358 | nvdimm_bus->dev.release = nvdimm_bus_release; | |
359 | nvdimm_bus->dev.groups = nd_desc->attr_groups; | |
360 | nvdimm_bus->dev.bus = &nvdimm_bus_type; | |
361 | dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id); | |
362 | rc = device_register(&nvdimm_bus->dev); | |
363 | if (rc) { | |
364 | dev_dbg(&nvdimm_bus->dev, "registration failed: %d\n", rc); | |
365 | goto err; | |
366 | } | |
367 | ||
368 | return nvdimm_bus; | |
369 | err: | |
370 | put_device(&nvdimm_bus->dev); | |
371 | return NULL; | |
372 | } | |
373 | EXPORT_SYMBOL_GPL(nvdimm_bus_register); | |
374 | ||
375 | void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus) | |
376 | { | |
377 | if (!nvdimm_bus) | |
378 | return; | |
379 | device_unregister(&nvdimm_bus->dev); | |
380 | } | |
381 | EXPORT_SYMBOL_GPL(nvdimm_bus_unregister); | |
382 | ||
383 | static int child_unregister(struct device *dev, void *data) | |
384 | { | |
385 | /* | |
386 | * the singular ndctl class device per bus needs to be | |
387 | * "device_destroy"ed, so skip it here | |
388 | * | |
389 | * i.e. remove classless children | |
390 | */ | |
391 | if (dev->class) | |
392 | /* pass */; | |
393 | else | |
394 | nd_device_unregister(dev, ND_SYNC); | |
395 | return 0; | |
396 | } | |
397 | ||
398 | static void free_poison_list(struct list_head *poison_list) | |
399 | { | |
400 | struct nd_poison *pl, *next; | |
401 | ||
402 | list_for_each_entry_safe(pl, next, poison_list, list) { | |
403 | list_del(&pl->list); | |
404 | kfree(pl); | |
405 | } | |
406 | list_del_init(poison_list); | |
407 | } | |
408 | ||
409 | static int nd_bus_remove(struct device *dev) | |
410 | { | |
411 | struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); | |
412 | ||
413 | mutex_lock(&nvdimm_bus_list_mutex); | |
414 | list_del_init(&nvdimm_bus->list); | |
415 | mutex_unlock(&nvdimm_bus_list_mutex); | |
416 | ||
417 | nd_synchronize(); | |
418 | device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister); | |
419 | ||
b3b454f6 | 420 | spin_lock(&nvdimm_bus->poison_lock); |
18515942 | 421 | free_poison_list(&nvdimm_bus->poison_list); |
b3b454f6 | 422 | spin_unlock(&nvdimm_bus->poison_lock); |
18515942 DW |
423 | |
424 | nvdimm_bus_destroy_ndctl(nvdimm_bus); | |
425 | ||
426 | return 0; | |
427 | } | |
428 | ||
429 | static int nd_bus_probe(struct device *dev) | |
430 | { | |
431 | struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); | |
432 | int rc; | |
433 | ||
434 | rc = nvdimm_bus_create_ndctl(nvdimm_bus); | |
435 | if (rc) | |
436 | return rc; | |
437 | ||
438 | mutex_lock(&nvdimm_bus_list_mutex); | |
439 | list_add_tail(&nvdimm_bus->list, &nvdimm_bus_list); | |
440 | mutex_unlock(&nvdimm_bus_list_mutex); | |
441 | ||
442 | /* enable bus provider attributes to look up their local context */ | |
443 | dev_set_drvdata(dev, nvdimm_bus->nd_desc); | |
444 | ||
445 | return 0; | |
446 | } | |
447 | ||
448 | static struct nd_device_driver nd_bus_driver = { | |
449 | .probe = nd_bus_probe, | |
450 | .remove = nd_bus_remove, | |
451 | .drv = { | |
452 | .name = "nd_bus", | |
453 | .suppress_bind_attrs = true, | |
454 | .bus = &nvdimm_bus_type, | |
455 | .owner = THIS_MODULE, | |
456 | .mod_name = KBUILD_MODNAME, | |
457 | }, | |
4d88a97a DW |
458 | }; |
459 | ||
18515942 DW |
460 | static int nvdimm_bus_match(struct device *dev, struct device_driver *drv) |
461 | { | |
462 | struct nd_device_driver *nd_drv = to_nd_device_driver(drv); | |
463 | ||
464 | if (is_nvdimm_bus(dev) && nd_drv == &nd_bus_driver) | |
465 | return true; | |
466 | ||
467 | return !!test_bit(to_nd_device_type(dev), &nd_drv->type); | |
468 | } | |
469 | ||
4d88a97a DW |
470 | static ASYNC_DOMAIN_EXCLUSIVE(nd_async_domain); |
471 | ||
472 | void nd_synchronize(void) | |
473 | { | |
474 | async_synchronize_full_domain(&nd_async_domain); | |
475 | } | |
476 | EXPORT_SYMBOL_GPL(nd_synchronize); | |
477 | ||
478 | static void nd_async_device_register(void *d, async_cookie_t cookie) | |
479 | { | |
480 | struct device *dev = d; | |
481 | ||
482 | if (device_add(dev) != 0) { | |
483 | dev_err(dev, "%s: failed\n", __func__); | |
484 | put_device(dev); | |
485 | } | |
486 | put_device(dev); | |
487 | } | |
488 | ||
489 | static void nd_async_device_unregister(void *d, async_cookie_t cookie) | |
490 | { | |
491 | struct device *dev = d; | |
492 | ||
0ba1c634 DW |
493 | /* flush bus operations before delete */ |
494 | nvdimm_bus_lock(dev); | |
495 | nvdimm_bus_unlock(dev); | |
496 | ||
4d88a97a DW |
497 | device_unregister(dev); |
498 | put_device(dev); | |
499 | } | |
500 | ||
8c2f7e86 | 501 | void __nd_device_register(struct device *dev) |
4d88a97a | 502 | { |
cd03412a DW |
503 | if (!dev) |
504 | return; | |
4d88a97a | 505 | dev->bus = &nvdimm_bus_type; |
4d88a97a DW |
506 | get_device(dev); |
507 | async_schedule_domain(nd_async_device_register, dev, | |
508 | &nd_async_domain); | |
509 | } | |
8c2f7e86 DW |
510 | |
511 | void nd_device_register(struct device *dev) | |
512 | { | |
513 | device_initialize(dev); | |
514 | __nd_device_register(dev); | |
515 | } | |
4d88a97a DW |
516 | EXPORT_SYMBOL(nd_device_register); |
517 | ||
518 | void nd_device_unregister(struct device *dev, enum nd_async_mode mode) | |
519 | { | |
520 | switch (mode) { | |
521 | case ND_ASYNC: | |
522 | get_device(dev); | |
523 | async_schedule_domain(nd_async_device_unregister, dev, | |
524 | &nd_async_domain); | |
525 | break; | |
526 | case ND_SYNC: | |
527 | nd_synchronize(); | |
528 | device_unregister(dev); | |
529 | break; | |
530 | } | |
531 | } | |
532 | EXPORT_SYMBOL(nd_device_unregister); | |
533 | ||
534 | /** | |
535 | * __nd_driver_register() - register a region or a namespace driver | |
536 | * @nd_drv: driver to register | |
537 | * @owner: automatically set by nd_driver_register() macro | |
538 | * @mod_name: automatically set by nd_driver_register() macro | |
539 | */ | |
540 | int __nd_driver_register(struct nd_device_driver *nd_drv, struct module *owner, | |
541 | const char *mod_name) | |
542 | { | |
543 | struct device_driver *drv = &nd_drv->drv; | |
544 | ||
545 | if (!nd_drv->type) { | |
546 | pr_debug("driver type bitmask not set (%pf)\n", | |
547 | __builtin_return_address(0)); | |
548 | return -EINVAL; | |
549 | } | |
550 | ||
6cf9c5ba DW |
551 | if (!nd_drv->probe) { |
552 | pr_debug("%s ->probe() must be specified\n", mod_name); | |
4d88a97a DW |
553 | return -EINVAL; |
554 | } | |
555 | ||
556 | drv->bus = &nvdimm_bus_type; | |
557 | drv->owner = owner; | |
558 | drv->mod_name = mod_name; | |
559 | ||
560 | return driver_register(drv); | |
561 | } | |
562 | EXPORT_SYMBOL(__nd_driver_register); | |
563 | ||
58138820 DW |
564 | int nvdimm_revalidate_disk(struct gendisk *disk) |
565 | { | |
52c44d93 | 566 | struct device *dev = disk_to_dev(disk)->parent; |
58138820 DW |
567 | struct nd_region *nd_region = to_nd_region(dev->parent); |
568 | const char *pol = nd_region->ro ? "only" : "write"; | |
569 | ||
570 | if (nd_region->ro == get_disk_ro(disk)) | |
571 | return 0; | |
572 | ||
573 | dev_info(dev, "%s read-%s, marking %s read-%s\n", | |
574 | dev_name(&nd_region->dev), pol, disk->disk_name, pol); | |
575 | set_disk_ro(disk, nd_region->ro); | |
576 | ||
577 | return 0; | |
578 | ||
579 | } | |
580 | EXPORT_SYMBOL(nvdimm_revalidate_disk); | |
581 | ||
4d88a97a DW |
582 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, |
583 | char *buf) | |
584 | { | |
585 | return sprintf(buf, ND_DEVICE_MODALIAS_FMT "\n", | |
586 | to_nd_device_type(dev)); | |
587 | } | |
588 | static DEVICE_ATTR_RO(modalias); | |
589 | ||
590 | static ssize_t devtype_show(struct device *dev, struct device_attribute *attr, | |
591 | char *buf) | |
592 | { | |
593 | return sprintf(buf, "%s\n", dev->type->name); | |
594 | } | |
595 | static DEVICE_ATTR_RO(devtype); | |
596 | ||
597 | static struct attribute *nd_device_attributes[] = { | |
598 | &dev_attr_modalias.attr, | |
599 | &dev_attr_devtype.attr, | |
600 | NULL, | |
601 | }; | |
602 | ||
603 | /** | |
604 | * nd_device_attribute_group - generic attributes for all devices on an nd bus | |
605 | */ | |
606 | struct attribute_group nd_device_attribute_group = { | |
607 | .attrs = nd_device_attributes, | |
e6dfb2de | 608 | }; |
4d88a97a | 609 | EXPORT_SYMBOL_GPL(nd_device_attribute_group); |
e6dfb2de | 610 | |
74ae66c3 TK |
611 | static ssize_t numa_node_show(struct device *dev, |
612 | struct device_attribute *attr, char *buf) | |
613 | { | |
614 | return sprintf(buf, "%d\n", dev_to_node(dev)); | |
615 | } | |
616 | static DEVICE_ATTR_RO(numa_node); | |
617 | ||
618 | static struct attribute *nd_numa_attributes[] = { | |
619 | &dev_attr_numa_node.attr, | |
620 | NULL, | |
621 | }; | |
622 | ||
623 | static umode_t nd_numa_attr_visible(struct kobject *kobj, struct attribute *a, | |
624 | int n) | |
625 | { | |
626 | if (!IS_ENABLED(CONFIG_NUMA)) | |
627 | return 0; | |
628 | ||
629 | return a->mode; | |
630 | } | |
631 | ||
632 | /** | |
633 | * nd_numa_attribute_group - NUMA attributes for all devices on an nd bus | |
634 | */ | |
635 | struct attribute_group nd_numa_attribute_group = { | |
636 | .attrs = nd_numa_attributes, | |
637 | .is_visible = nd_numa_attr_visible, | |
638 | }; | |
639 | EXPORT_SYMBOL_GPL(nd_numa_attribute_group); | |
640 | ||
45def22c DW |
641 | int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus) |
642 | { | |
643 | dev_t devt = MKDEV(nvdimm_bus_major, nvdimm_bus->id); | |
644 | struct device *dev; | |
645 | ||
646 | dev = device_create(nd_class, &nvdimm_bus->dev, devt, nvdimm_bus, | |
647 | "ndctl%d", nvdimm_bus->id); | |
648 | ||
42588958 | 649 | if (IS_ERR(dev)) |
45def22c DW |
650 | dev_dbg(&nvdimm_bus->dev, "failed to register ndctl%d: %ld\n", |
651 | nvdimm_bus->id, PTR_ERR(dev)); | |
42588958 | 652 | return PTR_ERR_OR_ZERO(dev); |
45def22c DW |
653 | } |
654 | ||
655 | void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus) | |
656 | { | |
657 | device_destroy(nd_class, MKDEV(nvdimm_bus_major, nvdimm_bus->id)); | |
658 | } | |
659 | ||
62232e45 DW |
660 | static const struct nd_cmd_desc __nd_cmd_dimm_descs[] = { |
661 | [ND_CMD_IMPLEMENTED] = { }, | |
662 | [ND_CMD_SMART] = { | |
663 | .out_num = 2, | |
21129112 | 664 | .out_sizes = { 4, 128, }, |
62232e45 DW |
665 | }, |
666 | [ND_CMD_SMART_THRESHOLD] = { | |
667 | .out_num = 2, | |
668 | .out_sizes = { 4, 8, }, | |
669 | }, | |
670 | [ND_CMD_DIMM_FLAGS] = { | |
671 | .out_num = 2, | |
672 | .out_sizes = { 4, 4 }, | |
673 | }, | |
674 | [ND_CMD_GET_CONFIG_SIZE] = { | |
675 | .out_num = 3, | |
676 | .out_sizes = { 4, 4, 4, }, | |
677 | }, | |
678 | [ND_CMD_GET_CONFIG_DATA] = { | |
679 | .in_num = 2, | |
680 | .in_sizes = { 4, 4, }, | |
681 | .out_num = 2, | |
682 | .out_sizes = { 4, UINT_MAX, }, | |
683 | }, | |
684 | [ND_CMD_SET_CONFIG_DATA] = { | |
685 | .in_num = 3, | |
686 | .in_sizes = { 4, 4, UINT_MAX, }, | |
687 | .out_num = 1, | |
688 | .out_sizes = { 4, }, | |
689 | }, | |
690 | [ND_CMD_VENDOR] = { | |
691 | .in_num = 3, | |
692 | .in_sizes = { 4, 4, UINT_MAX, }, | |
693 | .out_num = 3, | |
694 | .out_sizes = { 4, 4, UINT_MAX, }, | |
695 | }, | |
31eca76b DW |
696 | [ND_CMD_CALL] = { |
697 | .in_num = 2, | |
698 | .in_sizes = { sizeof(struct nd_cmd_pkg), UINT_MAX, }, | |
699 | .out_num = 1, | |
700 | .out_sizes = { UINT_MAX, }, | |
701 | }, | |
62232e45 DW |
702 | }; |
703 | ||
704 | const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd) | |
705 | { | |
706 | if (cmd < ARRAY_SIZE(__nd_cmd_dimm_descs)) | |
707 | return &__nd_cmd_dimm_descs[cmd]; | |
708 | return NULL; | |
709 | } | |
710 | EXPORT_SYMBOL_GPL(nd_cmd_dimm_desc); | |
711 | ||
712 | static const struct nd_cmd_desc __nd_cmd_bus_descs[] = { | |
713 | [ND_CMD_IMPLEMENTED] = { }, | |
714 | [ND_CMD_ARS_CAP] = { | |
715 | .in_num = 2, | |
716 | .in_sizes = { 8, 8, }, | |
4577b066 DW |
717 | .out_num = 4, |
718 | .out_sizes = { 4, 4, 4, 4, }, | |
62232e45 DW |
719 | }, |
720 | [ND_CMD_ARS_START] = { | |
4577b066 DW |
721 | .in_num = 5, |
722 | .in_sizes = { 8, 8, 2, 1, 5, }, | |
723 | .out_num = 2, | |
724 | .out_sizes = { 4, 4, }, | |
62232e45 DW |
725 | }, |
726 | [ND_CMD_ARS_STATUS] = { | |
747ffe11 DW |
727 | .out_num = 3, |
728 | .out_sizes = { 4, 4, UINT_MAX, }, | |
62232e45 | 729 | }, |
d4f32367 DW |
730 | [ND_CMD_CLEAR_ERROR] = { |
731 | .in_num = 2, | |
732 | .in_sizes = { 8, 8, }, | |
733 | .out_num = 3, | |
734 | .out_sizes = { 4, 4, 8, }, | |
735 | }, | |
31eca76b DW |
736 | [ND_CMD_CALL] = { |
737 | .in_num = 2, | |
738 | .in_sizes = { sizeof(struct nd_cmd_pkg), UINT_MAX, }, | |
739 | .out_num = 1, | |
740 | .out_sizes = { UINT_MAX, }, | |
741 | }, | |
62232e45 DW |
742 | }; |
743 | ||
744 | const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd) | |
745 | { | |
746 | if (cmd < ARRAY_SIZE(__nd_cmd_bus_descs)) | |
747 | return &__nd_cmd_bus_descs[cmd]; | |
748 | return NULL; | |
749 | } | |
750 | EXPORT_SYMBOL_GPL(nd_cmd_bus_desc); | |
751 | ||
752 | u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd, | |
753 | const struct nd_cmd_desc *desc, int idx, void *buf) | |
754 | { | |
755 | if (idx >= desc->in_num) | |
756 | return UINT_MAX; | |
757 | ||
758 | if (desc->in_sizes[idx] < UINT_MAX) | |
759 | return desc->in_sizes[idx]; | |
760 | ||
761 | if (nvdimm && cmd == ND_CMD_SET_CONFIG_DATA && idx == 2) { | |
762 | struct nd_cmd_set_config_hdr *hdr = buf; | |
763 | ||
764 | return hdr->in_length; | |
765 | } else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) { | |
766 | struct nd_cmd_vendor_hdr *hdr = buf; | |
767 | ||
768 | return hdr->in_length; | |
31eca76b DW |
769 | } else if (cmd == ND_CMD_CALL) { |
770 | struct nd_cmd_pkg *pkg = buf; | |
771 | ||
772 | return pkg->nd_size_in; | |
62232e45 DW |
773 | } |
774 | ||
775 | return UINT_MAX; | |
776 | } | |
777 | EXPORT_SYMBOL_GPL(nd_cmd_in_size); | |
778 | ||
779 | u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd, | |
780 | const struct nd_cmd_desc *desc, int idx, const u32 *in_field, | |
efda1b5d | 781 | const u32 *out_field, unsigned long remainder) |
62232e45 DW |
782 | { |
783 | if (idx >= desc->out_num) | |
784 | return UINT_MAX; | |
785 | ||
786 | if (desc->out_sizes[idx] < UINT_MAX) | |
787 | return desc->out_sizes[idx]; | |
788 | ||
789 | if (nvdimm && cmd == ND_CMD_GET_CONFIG_DATA && idx == 1) | |
790 | return in_field[1]; | |
791 | else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) | |
792 | return out_field[1]; | |
efda1b5d DW |
793 | else if (!nvdimm && cmd == ND_CMD_ARS_STATUS && idx == 2) { |
794 | /* | |
795 | * Per table 9-276 ARS Data in ACPI 6.1, out_field[1] is | |
796 | * "Size of Output Buffer in bytes, including this | |
797 | * field." | |
798 | */ | |
799 | if (out_field[1] < 4) | |
800 | return 0; | |
801 | /* | |
802 | * ACPI 6.1 is ambiguous if 'status' is included in the | |
803 | * output size. If we encounter an output size that | |
804 | * overshoots the remainder by 4 bytes, assume it was | |
805 | * including 'status'. | |
806 | */ | |
807 | if (out_field[1] - 8 == remainder) | |
808 | return remainder; | |
809 | return out_field[1] - 4; | |
810 | } else if (cmd == ND_CMD_CALL) { | |
31eca76b DW |
811 | struct nd_cmd_pkg *pkg = (struct nd_cmd_pkg *) in_field; |
812 | ||
813 | return pkg->nd_size_out; | |
814 | } | |
815 | ||
62232e45 DW |
816 | |
817 | return UINT_MAX; | |
818 | } | |
819 | EXPORT_SYMBOL_GPL(nd_cmd_out_size); | |
820 | ||
bf9bccc1 | 821 | void wait_nvdimm_bus_probe_idle(struct device *dev) |
eaf96153 | 822 | { |
bf9bccc1 DW |
823 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
824 | ||
eaf96153 DW |
825 | do { |
826 | if (nvdimm_bus->probe_active == 0) | |
827 | break; | |
828 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
829 | wait_event(nvdimm_bus->probe_wait, | |
830 | nvdimm_bus->probe_active == 0); | |
831 | nvdimm_bus_lock(&nvdimm_bus->dev); | |
832 | } while (true); | |
833 | } | |
834 | ||
006358b3 | 835 | static int nd_pmem_forget_poison_check(struct device *dev, void *data) |
d4f32367 | 836 | { |
006358b3 DJ |
837 | struct nd_cmd_clear_error *clear_err = |
838 | (struct nd_cmd_clear_error *)data; | |
839 | struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL; | |
840 | struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL; | |
841 | struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL; | |
842 | struct nd_namespace_common *ndns = NULL; | |
843 | struct nd_namespace_io *nsio; | |
844 | resource_size_t offset = 0, end_trunc = 0, start, end, pstart, pend; | |
845 | ||
846 | if (nd_dax || !dev->driver) | |
847 | return 0; | |
848 | ||
849 | start = clear_err->address; | |
850 | end = clear_err->address + clear_err->cleared - 1; | |
851 | ||
852 | if (nd_btt || nd_pfn || nd_dax) { | |
853 | if (nd_btt) | |
854 | ndns = nd_btt->ndns; | |
855 | else if (nd_pfn) | |
856 | ndns = nd_pfn->ndns; | |
857 | else if (nd_dax) | |
858 | ndns = nd_dax->nd_pfn.ndns; | |
859 | ||
860 | if (!ndns) | |
861 | return 0; | |
862 | } else | |
863 | ndns = to_ndns(dev); | |
864 | ||
865 | nsio = to_nd_namespace_io(&ndns->dev); | |
866 | pstart = nsio->res.start + offset; | |
867 | pend = nsio->res.end - end_trunc; | |
868 | ||
869 | if ((pstart >= start) && (pend <= end)) | |
d4f32367 | 870 | return -EBUSY; |
006358b3 | 871 | |
d4f32367 | 872 | return 0; |
006358b3 DJ |
873 | |
874 | } | |
875 | ||
876 | static int nd_ns_forget_poison_check(struct device *dev, void *data) | |
877 | { | |
878 | return device_for_each_child(dev, data, nd_pmem_forget_poison_check); | |
d4f32367 DW |
879 | } |
880 | ||
eaf96153 | 881 | /* set_config requires an idle interleave set */ |
87bf572e | 882 | static int nd_cmd_clear_to_send(struct nvdimm_bus *nvdimm_bus, |
006358b3 | 883 | struct nvdimm *nvdimm, unsigned int cmd, void *data) |
eaf96153 | 884 | { |
87bf572e DW |
885 | struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; |
886 | ||
887 | /* ask the bus provider if it would like to block this request */ | |
888 | if (nd_desc->clear_to_send) { | |
889 | int rc = nd_desc->clear_to_send(nd_desc, nvdimm, cmd); | |
890 | ||
891 | if (rc) | |
892 | return rc; | |
893 | } | |
eaf96153 | 894 | |
d4f32367 DW |
895 | /* require clear error to go through the pmem driver */ |
896 | if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR) | |
006358b3 DJ |
897 | return device_for_each_child(&nvdimm_bus->dev, data, |
898 | nd_ns_forget_poison_check); | |
d4f32367 | 899 | |
eaf96153 DW |
900 | if (!nvdimm || cmd != ND_CMD_SET_CONFIG_DATA) |
901 | return 0; | |
902 | ||
87bf572e | 903 | /* prevent label manipulation while the kernel owns label updates */ |
bf9bccc1 | 904 | wait_nvdimm_bus_probe_idle(&nvdimm_bus->dev); |
eaf96153 DW |
905 | if (atomic_read(&nvdimm->busy)) |
906 | return -EBUSY; | |
907 | return 0; | |
908 | } | |
909 | ||
62232e45 DW |
910 | static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm, |
911 | int read_only, unsigned int ioctl_cmd, unsigned long arg) | |
912 | { | |
913 | struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; | |
62232e45 DW |
914 | static char out_env[ND_CMD_MAX_ENVELOPE]; |
915 | static char in_env[ND_CMD_MAX_ENVELOPE]; | |
916 | const struct nd_cmd_desc *desc = NULL; | |
917 | unsigned int cmd = _IOC_NR(ioctl_cmd); | |
62232e45 | 918 | struct device *dev = &nvdimm_bus->dev; |
95cc03ca | 919 | void __user *p = (void __user *) arg; |
62232e45 | 920 | const char *cmd_name, *dimm_name; |
95cc03ca DW |
921 | u32 in_len = 0, out_len = 0; |
922 | unsigned int func = cmd; | |
e3654eca | 923 | unsigned long cmd_mask; |
95cc03ca | 924 | struct nd_cmd_pkg pkg; |
006358b3 | 925 | int rc, i, cmd_rc; |
95cc03ca DW |
926 | u64 buf_len = 0; |
927 | void *buf; | |
62232e45 DW |
928 | |
929 | if (nvdimm) { | |
930 | desc = nd_cmd_dimm_desc(cmd); | |
931 | cmd_name = nvdimm_cmd_name(cmd); | |
e3654eca | 932 | cmd_mask = nvdimm->cmd_mask; |
62232e45 DW |
933 | dimm_name = dev_name(&nvdimm->dev); |
934 | } else { | |
935 | desc = nd_cmd_bus_desc(cmd); | |
936 | cmd_name = nvdimm_bus_cmd_name(cmd); | |
e3654eca | 937 | cmd_mask = nd_desc->cmd_mask; |
62232e45 DW |
938 | dimm_name = "bus"; |
939 | } | |
940 | ||
31eca76b DW |
941 | if (cmd == ND_CMD_CALL) { |
942 | if (copy_from_user(&pkg, p, sizeof(pkg))) | |
943 | return -EFAULT; | |
944 | } | |
945 | ||
62232e45 | 946 | if (!desc || (desc->out_num + desc->in_num == 0) || |
e3654eca | 947 | !test_bit(cmd, &cmd_mask)) |
62232e45 DW |
948 | return -ENOTTY; |
949 | ||
950 | /* fail write commands (when read-only) */ | |
951 | if (read_only) | |
07accfa9 JH |
952 | switch (cmd) { |
953 | case ND_CMD_VENDOR: | |
954 | case ND_CMD_SET_CONFIG_DATA: | |
955 | case ND_CMD_ARS_START: | |
d4f32367 | 956 | case ND_CMD_CLEAR_ERROR: |
31eca76b | 957 | case ND_CMD_CALL: |
62232e45 DW |
958 | dev_dbg(&nvdimm_bus->dev, "'%s' command while read-only.\n", |
959 | nvdimm ? nvdimm_cmd_name(cmd) | |
960 | : nvdimm_bus_cmd_name(cmd)); | |
961 | return -EPERM; | |
962 | default: | |
963 | break; | |
964 | } | |
965 | ||
966 | /* process an input envelope */ | |
967 | for (i = 0; i < desc->in_num; i++) { | |
968 | u32 in_size, copy; | |
969 | ||
970 | in_size = nd_cmd_in_size(nvdimm, cmd, desc, i, in_env); | |
971 | if (in_size == UINT_MAX) { | |
972 | dev_err(dev, "%s:%s unknown input size cmd: %s field: %d\n", | |
973 | __func__, dimm_name, cmd_name, i); | |
974 | return -ENXIO; | |
975 | } | |
62232e45 DW |
976 | if (in_len < sizeof(in_env)) |
977 | copy = min_t(u32, sizeof(in_env) - in_len, in_size); | |
978 | else | |
979 | copy = 0; | |
980 | if (copy && copy_from_user(&in_env[in_len], p + in_len, copy)) | |
981 | return -EFAULT; | |
982 | in_len += in_size; | |
983 | } | |
984 | ||
31eca76b | 985 | if (cmd == ND_CMD_CALL) { |
53b85a44 | 986 | func = pkg.nd_command; |
95cc03ca | 987 | dev_dbg(dev, "%s:%s, idx: %llu, in: %u, out: %u, len %llu\n", |
31eca76b DW |
988 | __func__, dimm_name, pkg.nd_command, |
989 | in_len, out_len, buf_len); | |
990 | ||
991 | for (i = 0; i < ARRAY_SIZE(pkg.nd_reserved2); i++) | |
992 | if (pkg.nd_reserved2[i]) | |
993 | return -EINVAL; | |
994 | } | |
995 | ||
62232e45 DW |
996 | /* process an output envelope */ |
997 | for (i = 0; i < desc->out_num; i++) { | |
998 | u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i, | |
efda1b5d | 999 | (u32 *) in_env, (u32 *) out_env, 0); |
62232e45 DW |
1000 | u32 copy; |
1001 | ||
1002 | if (out_size == UINT_MAX) { | |
1003 | dev_dbg(dev, "%s:%s unknown output size cmd: %s field: %d\n", | |
1004 | __func__, dimm_name, cmd_name, i); | |
1005 | return -EFAULT; | |
1006 | } | |
62232e45 DW |
1007 | if (out_len < sizeof(out_env)) |
1008 | copy = min_t(u32, sizeof(out_env) - out_len, out_size); | |
1009 | else | |
1010 | copy = 0; | |
1011 | if (copy && copy_from_user(&out_env[out_len], | |
1012 | p + in_len + out_len, copy)) | |
1013 | return -EFAULT; | |
1014 | out_len += out_size; | |
1015 | } | |
1016 | ||
95cc03ca | 1017 | buf_len = (u64) out_len + (u64) in_len; |
62232e45 | 1018 | if (buf_len > ND_IOCTL_MAX_BUFLEN) { |
95cc03ca | 1019 | dev_dbg(dev, "%s:%s cmd: %s buf_len: %llu > %d\n", __func__, |
62232e45 DW |
1020 | dimm_name, cmd_name, buf_len, |
1021 | ND_IOCTL_MAX_BUFLEN); | |
1022 | return -EINVAL; | |
1023 | } | |
1024 | ||
1025 | buf = vmalloc(buf_len); | |
1026 | if (!buf) | |
1027 | return -ENOMEM; | |
1028 | ||
1029 | if (copy_from_user(buf, p, buf_len)) { | |
1030 | rc = -EFAULT; | |
1031 | goto out; | |
1032 | } | |
1033 | ||
eaf96153 | 1034 | nvdimm_bus_lock(&nvdimm_bus->dev); |
53b85a44 | 1035 | rc = nd_cmd_clear_to_send(nvdimm_bus, nvdimm, func, buf); |
eaf96153 DW |
1036 | if (rc) |
1037 | goto out_unlock; | |
1038 | ||
006358b3 | 1039 | rc = nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len, &cmd_rc); |
62232e45 | 1040 | if (rc < 0) |
eaf96153 | 1041 | goto out_unlock; |
006358b3 DJ |
1042 | |
1043 | if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR && cmd_rc >= 0) { | |
1044 | struct nd_cmd_clear_error *clear_err = buf; | |
006358b3 | 1045 | |
23f49844 DW |
1046 | nvdimm_account_cleared_poison(nvdimm_bus, clear_err->address, |
1047 | clear_err->cleared); | |
006358b3 | 1048 | } |
0beb2012 DW |
1049 | nvdimm_bus_unlock(&nvdimm_bus->dev); |
1050 | ||
62232e45 DW |
1051 | if (copy_to_user(p, buf, buf_len)) |
1052 | rc = -EFAULT; | |
0beb2012 DW |
1053 | |
1054 | vfree(buf); | |
1055 | return rc; | |
1056 | ||
eaf96153 DW |
1057 | out_unlock: |
1058 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
62232e45 DW |
1059 | out: |
1060 | vfree(buf); | |
1061 | return rc; | |
1062 | } | |
1063 | ||
45def22c DW |
1064 | static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1065 | { | |
62232e45 | 1066 | long id = (long) file->private_data; |
4dc0e7be | 1067 | int rc = -ENXIO, ro; |
62232e45 DW |
1068 | struct nvdimm_bus *nvdimm_bus; |
1069 | ||
4dc0e7be | 1070 | ro = ((file->f_flags & O_ACCMODE) == O_RDONLY); |
62232e45 DW |
1071 | mutex_lock(&nvdimm_bus_list_mutex); |
1072 | list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) { | |
1073 | if (nvdimm_bus->id == id) { | |
4dc0e7be | 1074 | rc = __nd_ioctl(nvdimm_bus, NULL, ro, cmd, arg); |
62232e45 DW |
1075 | break; |
1076 | } | |
1077 | } | |
1078 | mutex_unlock(&nvdimm_bus_list_mutex); | |
1079 | ||
1080 | return rc; | |
1081 | } | |
1082 | ||
1083 | static int match_dimm(struct device *dev, void *data) | |
1084 | { | |
1085 | long id = (long) data; | |
1086 | ||
1087 | if (is_nvdimm(dev)) { | |
1088 | struct nvdimm *nvdimm = to_nvdimm(dev); | |
1089 | ||
1090 | return nvdimm->id == id; | |
1091 | } | |
1092 | ||
1093 | return 0; | |
1094 | } | |
1095 | ||
1096 | static long nvdimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1097 | { | |
4dc0e7be | 1098 | int rc = -ENXIO, ro; |
62232e45 DW |
1099 | struct nvdimm_bus *nvdimm_bus; |
1100 | ||
4dc0e7be | 1101 | ro = ((file->f_flags & O_ACCMODE) == O_RDONLY); |
62232e45 DW |
1102 | mutex_lock(&nvdimm_bus_list_mutex); |
1103 | list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) { | |
1104 | struct device *dev = device_find_child(&nvdimm_bus->dev, | |
1105 | file->private_data, match_dimm); | |
1106 | struct nvdimm *nvdimm; | |
1107 | ||
1108 | if (!dev) | |
1109 | continue; | |
1110 | ||
1111 | nvdimm = to_nvdimm(dev); | |
4dc0e7be | 1112 | rc = __nd_ioctl(nvdimm_bus, nvdimm, ro, cmd, arg); |
62232e45 DW |
1113 | put_device(dev); |
1114 | break; | |
1115 | } | |
1116 | mutex_unlock(&nvdimm_bus_list_mutex); | |
1117 | ||
1118 | return rc; | |
1119 | } | |
1120 | ||
1121 | static int nd_open(struct inode *inode, struct file *file) | |
1122 | { | |
1123 | long minor = iminor(inode); | |
1124 | ||
1125 | file->private_data = (void *) minor; | |
1126 | return 0; | |
45def22c DW |
1127 | } |
1128 | ||
1129 | static const struct file_operations nvdimm_bus_fops = { | |
1130 | .owner = THIS_MODULE, | |
62232e45 | 1131 | .open = nd_open, |
45def22c DW |
1132 | .unlocked_ioctl = nd_ioctl, |
1133 | .compat_ioctl = nd_ioctl, | |
1134 | .llseek = noop_llseek, | |
1135 | }; | |
1136 | ||
62232e45 DW |
1137 | static const struct file_operations nvdimm_fops = { |
1138 | .owner = THIS_MODULE, | |
1139 | .open = nd_open, | |
1140 | .unlocked_ioctl = nvdimm_ioctl, | |
1141 | .compat_ioctl = nvdimm_ioctl, | |
1142 | .llseek = noop_llseek, | |
1143 | }; | |
1144 | ||
45def22c DW |
1145 | int __init nvdimm_bus_init(void) |
1146 | { | |
1147 | int rc; | |
1148 | ||
baa51277 DW |
1149 | BUILD_BUG_ON(sizeof(struct nd_smart_payload) != 128); |
1150 | BUILD_BUG_ON(sizeof(struct nd_smart_threshold_payload) != 8); | |
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 | } |