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