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/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->parent))
  40                 return nd_region_to_nstype(to_nd_region(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, "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(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(&nvdimm_bus->dev);
  65         nvdimm_bus->probe_active++;
  66         nvdimm_bus_unlock(&nvdimm_bus->dev);
  67 }
  68
  69 static void nvdimm_bus_probe_end(struct nvdimm_bus *nvdimm_bus)
  70 {
  71         nvdimm_bus_lock(&nvdimm_bus->dev);
  72         if (--nvdimm_bus->probe_active == 0)
  73                 wake_up(&nvdimm_bus->wait);
  74         nvdimm_bus_unlock(&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(dev->driver);
  80         struct module *provider = to_bus_provider(dev);
  81         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
  82         int rc;
  83
  84         if (!try_module_get(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->parent))
  94                 nd_region_advance_seeds(to_nd_region(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(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(dev->driver);
 108         struct module *provider = to_bus_provider(dev);
 109         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(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(provider);
 117 }
 118
 119 static void nvdimm_bus_shutdown(struct device *dev)
 120 {
 121         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
 122         struct nd_device_driver *nd_drv = NULL;
 123
 124         if (dev->driver)
 125                 nd_drv = to_nd_device_driver(dev->driver);
 126
 127         if (nd_drv && nd_drv->shutdown) {
 128                 nd_drv->shutdown(dev);
 129                 dev_dbg(&nvdimm_bus->dev, "%s.shutdown(%s)\n",
 130                                 dev->driver->name, dev_name(dev));
 131         }
 132 }
 133
 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(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_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(&nd_region->bb, sector, ctx->cleared / 512);
 185
 186         if (nd_region->bb_state)
 187                 sysfs_notify_dirent(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(&nvdimm_bus->dev, &ctx,
 201                         nvdimm_clear_badblocks_region);
 202 }
 203
 204 static void nvdimm_account_cleared_poison(struct nvdimm_bus *nvdimm_bus,
 205                 phys_addr_t phys, u64 cleared)
 206 {
 207         if (cleared > 0)
 208                 badrange_forget(&nvdimm_bus->badrange, phys, 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(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(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(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(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, 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 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_simple_remove(&nd_ida, nvdimm_bus->id);
 289         kfree(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(sizeof(*nvdimm_bus), GFP_KERNEL);
 340         if (!nvdimm_bus)
 341                 return NULL;
 342         INIT_LIST_HEAD(&nvdimm_bus->list);
 343         INIT_LIST_HEAD(&nvdimm_bus->mapping_list);
 344         init_waitqueue_head(&nvdimm_bus->wait);
 345         nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
 346         if (nvdimm_bus->id < 0) {
 347                 kfree(nvdimm_bus);
 348                 return NULL;
 349         }
 350         mutex_init(&nvdimm_bus->reconfig_mutex);
 351         badrange_init(&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(&nvdimm_bus->dev);
 359         lockdep_set_class(&nvdimm_bus->dev.mutex, &nvdimm_bus_key);
 360         device_set_pm_not_required(&nvdimm_bus->dev);
 361         rc = dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id);
 362         if (rc)
 363                 goto err;
 364
 365         rc = device_add(&nvdimm_bus->dev);
 366         if (rc) {
 367                 dev_dbg(&nvdimm_bus->dev, "registration failed: %d\n", rc);
 368                 goto err;
 369         }
 370
 371         return nvdimm_bus;
 372  err:
 373         put_device(&nvdimm_bus->dev);
 374         return NULL;
 375 }
 376 EXPORT_SYMBOL_GPL(nvdimm_bus_register);
 377
 378 void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)
 379 {
 380         if (!nvdimm_bus)
 381                 return;
 382         device_unregister(&nvdimm_bus->dev);
 383 }
 384 EXPORT_SYMBOL_GPL(nvdimm_bus_unregister);
 385
 386 static int child_unregister(struct device *dev, void *data)
 387 {
 388         /*
 389          * the singular ndctl class device per bus needs to be
 390          * "device_destroy"ed, so skip it here
 391          *
 392          * i.e. remove classless children
 393          */
 394         if (dev->class)
 395                 return 0;
 396
 397         if (is_nvdimm(dev))
 398                 nvdimm_delete(to_nvdimm(dev));
 399         else
 400                 nd_device_unregister(dev, 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(&bre->list);
 411                 kfree(bre);
 412         }
 413         list_del_init(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(&nvdimm_bus->list);
 422         mutex_unlock(&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(&nvdimm_bus->dev, NULL, child_unregister);
 429
 430         spin_lock(&nvdimm_bus->badrange.lock);
 431         free_badrange_list(&nvdimm_bus->badrange.list);
 432         spin_unlock(&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(&nvdimm_bus->list, &nvdimm_bus_list);
 448         mutex_unlock(&nvdimm_bus_list_mutex);
 449
 450         /* enable bus provider attributes to look up their local context */
 451         dev_set_drvdata(dev, nvdimm_bus->nd_desc);
 452
 453         return 0;
 454 }
 455
 456 static struct nd_device_driver nd_bus_driver = {
 457         .probe = nd_bus_probe,
 458         .remove = nd_bus_remove,
 459         .drv = {
 460                 .name = "nd_bus",
 461                 .suppress_bind_attrs = true,
 462                 .bus = &nvdimm_bus_type,
 463                 .owner = THIS_MODULE,
 464                 .mod_name = KBUILD_MODNAME,
 465         },
 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(&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->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, 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->parent);
 529                 if (dev_to_node(dev) == NUMA_NO_NODE)
 530                         set_dev_node(dev, dev_to_node(dev->parent));
 531         }
 532         get_device(dev);
 533
 534         if (sync)
 535                 nd_async_device_register(dev, 0);
 536         else
 537                 async_schedule_dev_domain(nd_async_device_register, dev,
 538                                           &nd_async_domain);
 539 }
 540
 541 void nd_device_register(struct device *dev)
 542 {
 543         __nd_device_register(dev, false);
 544 }
 545 EXPORT_SYMBOL(nd_device_register);
 546
 547 void nd_device_register_sync(struct device *dev)
 548 {
 549         __nd_device_register(dev, 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(nd_async_device_unregister, dev,
 569                                 &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->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, 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, "%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, "%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(parent))
 683                 nd_region = to_nd_region(parent);
 684
 685         if (!nd_region)
 686                 return NUMA_NO_NODE;
 687         return nd_region->target_node;
 688 }
 689
 690 static ssize_t target_node_show(struct device *dev,
 691                 struct device_attribute *attr, char *buf)
 692 {
 693         return sprintf(buf, "%d\n", nvdimm_dev_to_target_node(dev));
 694 }
 695 static DEVICE_ATTR_RO(target_node);
 696
 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(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(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, "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(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(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(&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, 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(&nvdimm_bus->dev, data,
1011                                 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(&nvdimm_bus->dev);
1018         if (atomic_read(&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(&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(&pkg, p, 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(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(&in_env[in_len], p + in_len, 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(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(&out_env[out_len],
1151                                         p + in_len + out_len, 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(buf_len);
1167         if (!buf) {
1168                 rc = -ENOMEM;
1169                 goto out;
1170         }
1171
1172         if (copy_from_user(buf, p, 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, func, 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, clear_err->address,
1191                                 clear_err->cleared);
1192         }
1193
1194         if (copy_to_user(p, buf, buf_len))
1195                 rc = -EFAULT;
1196
1197 out_unlock:
1198         nvdimm_bus_unlock(dev);
1199         device_unlock(dev);
1200 out:
1201         kfree(in_env);
1202         kfree(out_env);
1203         vfree(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(&nvdimm_bus->dev,
1241                                         file->private_data, match_dimm);
1242                         if (!dev)
1243                                 continue;
1244                         nvdimm = to_nvdimm(dev);
1245                         found = nvdimm_bus;
1246                 } else if (nvdimm_bus->id == id) {
1247                         found = nvdimm_bus;
1248                 }
1249
1250                 if (found) {
1251                         atomic_inc(&nvdimm_bus->ioctl_active);
1252                         break;
1253                 }
1254         }
1255         mutex_unlock(&nvdimm_bus_list_mutex);
1256
1257         if (!found)
1258                 return -ENXIO;
1259
1260         nvdimm_bus = found;
1261         rc = __nd_ioctl(nvdimm_bus, nvdimm, ro, cmd, arg);
1262
1263         if (nvdimm)
1264                 put_device(&nvdimm->dev);
1265         if (atomic_dec_and_test(&nvdimm_bus->ioctl_active))
1266                 wake_up(&nvdimm_bus->wait);
1267
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, BUS_IOCTL);
1274 }
1275
1276 static long dimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1277 {
1278         return nd_ioctl(file, cmd, arg, DIMM_IOCTL);
1279 }
1280
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(&nvdimm_bus_type);
1310         if (rc)
1311                 return rc;
1312
1313         rc = register_chrdev(0, "ndctl", &nvdimm_bus_fops);
1314         if (rc < 0)
1315                 goto err_bus_chrdev;
1316         nvdimm_bus_major = rc;
1317
1318         rc = register_chrdev(0, "dimmctl", &nvdimm_fops);
1319         if (rc < 0)
1320                 goto err_dimm_chrdev;
1321         nvdimm_major = rc;
1322
1323         nd_class = class_create("nd");
1324         if (IS_ERR(nd_class)) {
1325                 rc = PTR_ERR(nd_class);
1326                 goto err_class;
1327         }
1328
1329         rc = driver_register(&nd_bus_driver.drv);
1330         if (rc)
1331                 goto err_nd_bus;
1332
1333         return 0;
1334
1335  err_nd_bus:
1336         class_destroy(nd_class);
1337  err_class:
1338         unregister_chrdev(nvdimm_major, "dimmctl");
1339  err_dimm_chrdev:
1340         unregister_chrdev(nvdimm_bus_major, "ndctl");
1341  err_bus_chrdev:
1342         bus_unregister(&nvdimm_bus_type);
1343
1344         return rc;
1345 }
1346
1347 void nvdimm_bus_exit(void)
1348 {
1349         driver_unregister(&nd_bus_driver.drv);
1350         class_destroy(nd_class);
1351         unregister_chrdev(nvdimm_bus_major, "ndctl");
1352         unregister_chrdev(nvdimm_major, "dimmctl");
1353         bus_unregister(&nvdimm_bus_type);
1354         ida_destroy(&nd_ida);
1355 }