drivers/nvdimm/bus.c

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