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         device_initialize(&nvdimm_bus->dev);
 367         device_set_pm_not_required(&nvdimm_bus->dev);
 368         rc = dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id);
 369         if (rc)
 370                 goto err;
 371
 372         rc = device_add(&nvdimm_bus->dev);
 373         if (rc) {
 374                 dev_dbg(&nvdimm_bus->dev, "registration failed: %d\n", rc);
 375                 goto err;
 376         }
 377
 378         return nvdimm_bus;
 379  err:
 380         put_device(&nvdimm_bus->dev);
 381         return NULL;
 382 }
 383 EXPORT_SYMBOL_GPL(nvdimm_bus_register);
 384
 385 void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)
 386 {
 387         if (!nvdimm_bus)
 388                 return;
 389         device_unregister(&nvdimm_bus->dev);
 390 }
 391 EXPORT_SYMBOL_GPL(nvdimm_bus_unregister);
 392
 393 static int child_unregister(struct device *dev, void *data)
 394 {
 395         /*
 396          * the singular ndctl class device per bus needs to be
 397          * "device_destroy"ed, so skip it here
 398          *
 399          * i.e. remove classless children
 400          */
 401         if (dev->class)
 402                 return 0;
 403
 404         if (is_nvdimm(dev))
 405                 nvdimm_delete(to_nvdimm(dev));
 406         else
 407                 nd_device_unregister(dev, ND_SYNC);
 408
 409         return 0;
 410 }
 411
 412 static void free_badrange_list(struct list_head *badrange_list)
 413 {
 414         struct badrange_entry *bre, *next;
 415
 416         list_for_each_entry_safe(bre, next, badrange_list, list) {
 417                 list_del(&bre->list);
 418                 kfree(bre);
 419         }
 420         list_del_init(badrange_list);
 421 }
 422
 423 static void nd_bus_remove(struct device *dev)
 424 {
 425         struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
 426
 427         mutex_lock(&nvdimm_bus_list_mutex);
 428         list_del_init(&nvdimm_bus->list);
 429         mutex_unlock(&nvdimm_bus_list_mutex);
 430
 431         wait_event(nvdimm_bus->wait,
 432                         atomic_read(&nvdimm_bus->ioctl_active) == 0);
 433
 434         nd_synchronize();
 435         device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister);
 436
 437         spin_lock(&nvdimm_bus->badrange.lock);
 438         free_badrange_list(&nvdimm_bus->badrange.list);
 439         spin_unlock(&nvdimm_bus->badrange.lock);
 440
 441         nvdimm_bus_destroy_ndctl(nvdimm_bus);
 442 }
 443
 444 static int nd_bus_probe(struct device *dev)
 445 {
 446         struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
 447         int rc;
 448
 449         rc = nvdimm_bus_create_ndctl(nvdimm_bus);
 450         if (rc)
 451                 return rc;
 452
 453         mutex_lock(&nvdimm_bus_list_mutex);
 454         list_add_tail(&nvdimm_bus->list, &nvdimm_bus_list);
 455         mutex_unlock(&nvdimm_bus_list_mutex);
 456
 457         /* enable bus provider attributes to look up their local context */
 458         dev_set_drvdata(dev, nvdimm_bus->nd_desc);
 459
 460         return 0;
 461 }
 462
 463 static struct nd_device_driver nd_bus_driver = {
 464         .probe = nd_bus_probe,
 465         .remove = nd_bus_remove,
 466         .drv = {
 467                 .name = "nd_bus",
 468                 .suppress_bind_attrs = true,
 469                 .bus = &nvdimm_bus_type,
 470                 .owner = THIS_MODULE,
 471                 .mod_name = KBUILD_MODNAME,
 472         },
 473 };
 474
 475 static int nvdimm_bus_match(struct device *dev, struct device_driver *drv)
 476 {
 477         struct nd_device_driver *nd_drv = to_nd_device_driver(drv);
 478
 479         if (is_nvdimm_bus(dev) && nd_drv == &nd_bus_driver)
 480                 return true;
 481
 482         return !!test_bit(to_nd_device_type(dev), &nd_drv->type);
 483 }
 484
 485 static ASYNC_DOMAIN_EXCLUSIVE(nd_async_domain);
 486
 487 void nd_synchronize(void)
 488 {
 489         async_synchronize_full_domain(&nd_async_domain);
 490 }
 491 EXPORT_SYMBOL_GPL(nd_synchronize);
 492
 493 static void nd_async_device_register(void *d, async_cookie_t cookie)
 494 {
 495         struct device *dev = d;
 496
 497         if (device_add(dev) != 0) {
 498                 dev_err(dev, "%s: failed\n", __func__);
 499                 put_device(dev);
 500         }
 501         put_device(dev);
 502         if (dev->parent)
 503                 put_device(dev->parent);
 504 }
 505
 506 static void nd_async_device_unregister(void *d, async_cookie_t cookie)
 507 {
 508         struct device *dev = d;
 509
 510         /* flush bus operations before delete */
 511         nvdimm_bus_lock(dev);
 512         nvdimm_bus_unlock(dev);
 513
 514         device_unregister(dev);
 515         put_device(dev);
 516 }
 517
 518 void __nd_device_register(struct device *dev)
 519 {
 520         if (!dev)
 521                 return;
 522
 523         /*
 524          * Ensure that region devices always have their NUMA node set as
 525          * early as possible. This way we are able to make certain that
 526          * any memory associated with the creation and the creation
 527          * itself of the region is associated with the correct node.
 528          */
 529         if (is_nd_region(dev))
 530                 set_dev_node(dev, to_nd_region(dev)->numa_node);
 531
 532         dev->bus = &nvdimm_bus_type;
 533         device_set_pm_not_required(dev);
 534         if (dev->parent) {
 535                 get_device(dev->parent);
 536                 if (dev_to_node(dev) == NUMA_NO_NODE)
 537                         set_dev_node(dev, dev_to_node(dev->parent));
 538         }
 539         get_device(dev);
 540
 541         async_schedule_dev_domain(nd_async_device_register, dev,
 542                                   &nd_async_domain);
 543 }
 544
 545 void nd_device_register(struct device *dev)
 546 {
 547         device_initialize(dev);
 548         __nd_device_register(dev);
 549 }
 550 EXPORT_SYMBOL(nd_device_register);
 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                 nd_device_lock(dev);
 580                 killed = kill_device(dev);
 581                 nd_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 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         int rc;
 736
 737         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 738         if (!dev)
 739                 return -ENOMEM;
 740         device_initialize(dev);
 741         device_set_pm_not_required(dev);
 742         dev->class = nd_class;
 743         dev->parent = &nvdimm_bus->dev;
 744         dev->devt = devt;
 745         dev->release = ndctl_release;
 746         rc = dev_set_name(dev, "ndctl%d", nvdimm_bus->id);
 747         if (rc)
 748                 goto err;
 749
 750         rc = device_add(dev);
 751         if (rc) {
 752                 dev_dbg(&nvdimm_bus->dev, "failed to register ndctl%d: %d\n",
 753                                 nvdimm_bus->id, rc);
 754                 goto err;
 755         }
 756         return 0;
 757
 758 err:
 759         put_device(dev);
 760         return rc;
 761 }
 762
 763 void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus)
 764 {
 765         device_destroy(nd_class, MKDEV(nvdimm_bus_major, nvdimm_bus->id));
 766 }
 767
 768 static const struct nd_cmd_desc __nd_cmd_dimm_descs[] = {
 769         [ND_CMD_IMPLEMENTED] = { },
 770         [ND_CMD_SMART] = {
 771                 .out_num = 2,
 772                 .out_sizes = { 4, 128, },
 773         },
 774         [ND_CMD_SMART_THRESHOLD] = {
 775                 .out_num = 2,
 776                 .out_sizes = { 4, 8, },
 777         },
 778         [ND_CMD_DIMM_FLAGS] = {
 779                 .out_num = 2,
 780                 .out_sizes = { 4, 4 },
 781         },
 782         [ND_CMD_GET_CONFIG_SIZE] = {
 783                 .out_num = 3,
 784                 .out_sizes = { 4, 4, 4, },
 785         },
 786         [ND_CMD_GET_CONFIG_DATA] = {
 787                 .in_num = 2,
 788                 .in_sizes = { 4, 4, },
 789                 .out_num = 2,
 790                 .out_sizes = { 4, UINT_MAX, },
 791         },
 792         [ND_CMD_SET_CONFIG_DATA] = {
 793                 .in_num = 3,
 794                 .in_sizes = { 4, 4, UINT_MAX, },
 795                 .out_num = 1,
 796                 .out_sizes = { 4, },
 797         },
 798         [ND_CMD_VENDOR] = {
 799                 .in_num = 3,
 800                 .in_sizes = { 4, 4, UINT_MAX, },
 801                 .out_num = 3,
 802                 .out_sizes = { 4, 4, UINT_MAX, },
 803         },
 804         [ND_CMD_CALL] = {
 805                 .in_num = 2,
 806                 .in_sizes = { sizeof(struct nd_cmd_pkg), UINT_MAX, },
 807                 .out_num = 1,
 808                 .out_sizes = { UINT_MAX, },
 809         },
 810 };
 811
 812 const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd)
 813 {
 814         if (cmd < ARRAY_SIZE(__nd_cmd_dimm_descs))
 815                 return &__nd_cmd_dimm_descs[cmd];
 816         return NULL;
 817 }
 818 EXPORT_SYMBOL_GPL(nd_cmd_dimm_desc);
 819
 820 static const struct nd_cmd_desc __nd_cmd_bus_descs[] = {
 821         [ND_CMD_IMPLEMENTED] = { },
 822         [ND_CMD_ARS_CAP] = {
 823                 .in_num = 2,
 824                 .in_sizes = { 8, 8, },
 825                 .out_num = 4,
 826                 .out_sizes = { 4, 4, 4, 4, },
 827         },
 828         [ND_CMD_ARS_START] = {
 829                 .in_num = 5,
 830                 .in_sizes = { 8, 8, 2, 1, 5, },
 831                 .out_num = 2,
 832                 .out_sizes = { 4, 4, },
 833         },
 834         [ND_CMD_ARS_STATUS] = {
 835                 .out_num = 3,
 836                 .out_sizes = { 4, 4, UINT_MAX, },
 837         },
 838         [ND_CMD_CLEAR_ERROR] = {
 839                 .in_num = 2,
 840                 .in_sizes = { 8, 8, },
 841                 .out_num = 3,
 842                 .out_sizes = { 4, 4, 8, },
 843         },
 844         [ND_CMD_CALL] = {
 845                 .in_num = 2,
 846                 .in_sizes = { sizeof(struct nd_cmd_pkg), UINT_MAX, },
 847                 .out_num = 1,
 848                 .out_sizes = { UINT_MAX, },
 849         },
 850 };
 851
 852 const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd)
 853 {
 854         if (cmd < ARRAY_SIZE(__nd_cmd_bus_descs))
 855                 return &__nd_cmd_bus_descs[cmd];
 856         return NULL;
 857 }
 858 EXPORT_SYMBOL_GPL(nd_cmd_bus_desc);
 859
 860 u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
 861                 const struct nd_cmd_desc *desc, int idx, void *buf)
 862 {
 863         if (idx >= desc->in_num)
 864                 return UINT_MAX;
 865
 866         if (desc->in_sizes[idx] < UINT_MAX)
 867                 return desc->in_sizes[idx];
 868
 869         if (nvdimm && cmd == ND_CMD_SET_CONFIG_DATA && idx == 2) {
 870                 struct nd_cmd_set_config_hdr *hdr = buf;
 871
 872                 return hdr->in_length;
 873         } else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) {
 874                 struct nd_cmd_vendor_hdr *hdr = buf;
 875
 876                 return hdr->in_length;
 877         } else if (cmd == ND_CMD_CALL) {
 878                 struct nd_cmd_pkg *pkg = buf;
 879
 880                 return pkg->nd_size_in;
 881         }
 882
 883         return UINT_MAX;
 884 }
 885 EXPORT_SYMBOL_GPL(nd_cmd_in_size);
 886
 887 u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
 888                 const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
 889                 const u32 *out_field, unsigned long remainder)
 890 {
 891         if (idx >= desc->out_num)
 892                 return UINT_MAX;
 893
 894         if (desc->out_sizes[idx] < UINT_MAX)
 895                 return desc->out_sizes[idx];
 896
 897         if (nvdimm && cmd == ND_CMD_GET_CONFIG_DATA && idx == 1)
 898                 return in_field[1];
 899         else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2)
 900                 return out_field[1];
 901         else if (!nvdimm && cmd == ND_CMD_ARS_STATUS && idx == 2) {
 902                 /*
 903                  * Per table 9-276 ARS Data in ACPI 6.1, out_field[1] is
 904                  * "Size of Output Buffer in bytes, including this
 905                  * field."
 906                  */
 907                 if (out_field[1] < 4)
 908                         return 0;
 909                 /*
 910                  * ACPI 6.1 is ambiguous if 'status' is included in the
 911                  * output size. If we encounter an output size that
 912                  * overshoots the remainder by 4 bytes, assume it was
 913                  * including 'status'.
 914                  */
 915                 if (out_field[1] - 4 == remainder)
 916                         return remainder;
 917                 return out_field[1] - 8;
 918         } else if (cmd == ND_CMD_CALL) {
 919                 struct nd_cmd_pkg *pkg = (struct nd_cmd_pkg *) in_field;
 920
 921                 return pkg->nd_size_out;
 922         }
 923
 924
 925         return UINT_MAX;
 926 }
 927 EXPORT_SYMBOL_GPL(nd_cmd_out_size);
 928
 929 void wait_nvdimm_bus_probe_idle(struct device *dev)
 930 {
 931         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
 932
 933         do {
 934                 if (nvdimm_bus->probe_active == 0)
 935                         break;
 936                 nvdimm_bus_unlock(dev);
 937                 nd_device_unlock(dev);
 938                 wait_event(nvdimm_bus->wait,
 939                                 nvdimm_bus->probe_active == 0);
 940                 nd_device_lock(dev);
 941                 nvdimm_bus_lock(dev);
 942         } while (true);
 943 }
 944
 945 static int nd_pmem_forget_poison_check(struct device *dev, void *data)
 946 {
 947         struct nd_cmd_clear_error *clear_err =
 948                 (struct nd_cmd_clear_error *)data;
 949         struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL;
 950         struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL;
 951         struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL;
 952         struct nd_namespace_common *ndns = NULL;
 953         struct nd_namespace_io *nsio;
 954         resource_size_t offset = 0, end_trunc = 0, start, end, pstart, pend;
 955
 956         if (nd_dax || !dev->driver)
 957                 return 0;
 958
 959         start = clear_err->address;
 960         end = clear_err->address + clear_err->cleared - 1;
 961
 962         if (nd_btt || nd_pfn || nd_dax) {
 963                 if (nd_btt)
 964                         ndns = nd_btt->ndns;
 965                 else if (nd_pfn)
 966                         ndns = nd_pfn->ndns;
 967                 else if (nd_dax)
 968                         ndns = nd_dax->nd_pfn.ndns;
 969
 970                 if (!ndns)
 971                         return 0;
 972         } else
 973                 ndns = to_ndns(dev);
 974
 975         nsio = to_nd_namespace_io(&ndns->dev);
 976         pstart = nsio->res.start + offset;
 977         pend = nsio->res.end - end_trunc;
 978
 979         if ((pstart >= start) && (pend <= end))
 980                 return -EBUSY;
 981
 982         return 0;
 983
 984 }
 985
 986 static int nd_ns_forget_poison_check(struct device *dev, void *data)
 987 {
 988         return device_for_each_child(dev, data, nd_pmem_forget_poison_check);
 989 }
 990
 991 /* set_config requires an idle interleave set */
 992 static int nd_cmd_clear_to_send(struct nvdimm_bus *nvdimm_bus,
 993                 struct nvdimm *nvdimm, unsigned int cmd, void *data)
 994 {
 995         struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
 996
 997         /* ask the bus provider if it would like to block this request */
 998         if (nd_desc->clear_to_send) {
 999                 int rc = nd_desc->clear_to_send(nd_desc, nvdimm, cmd, data);
1000
1001                 if (rc)
1002                         return rc;
1003         }
1004
1005         /* require clear error to go through the pmem driver */
1006         if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR)
1007                 return device_for_each_child(&nvdimm_bus->dev, data,
1008                                 nd_ns_forget_poison_check);
1009
1010         if (!nvdimm || cmd != ND_CMD_SET_CONFIG_DATA)
1011                 return 0;
1012
1013         /* prevent label manipulation while the kernel owns label updates */
1014         wait_nvdimm_bus_probe_idle(&nvdimm_bus->dev);
1015         if (atomic_read(&nvdimm->busy))
1016                 return -EBUSY;
1017         return 0;
1018 }
1019
1020 static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
1021                 int read_only, unsigned int ioctl_cmd, unsigned long arg)
1022 {
1023         struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
1024         const struct nd_cmd_desc *desc = NULL;
1025         unsigned int cmd = _IOC_NR(ioctl_cmd);
1026         struct device *dev = &nvdimm_bus->dev;
1027         void __user *p = (void __user *) arg;
1028         char *out_env = NULL, *in_env = NULL;
1029         const char *cmd_name, *dimm_name;
1030         u32 in_len = 0, out_len = 0;
1031         unsigned int func = cmd;
1032         unsigned long cmd_mask;
1033         struct nd_cmd_pkg pkg;
1034         int rc, i, cmd_rc;
1035         void *buf = NULL;
1036         u64 buf_len = 0;
1037
1038         if (nvdimm) {
1039                 desc = nd_cmd_dimm_desc(cmd);
1040                 cmd_name = nvdimm_cmd_name(cmd);
1041                 cmd_mask = nvdimm->cmd_mask;
1042                 dimm_name = dev_name(&nvdimm->dev);
1043         } else {
1044                 desc = nd_cmd_bus_desc(cmd);
1045                 cmd_name = nvdimm_bus_cmd_name(cmd);
1046                 cmd_mask = nd_desc->cmd_mask;
1047                 dimm_name = "bus";
1048         }
1049
1050         /* Validate command family support against bus declared support */
1051         if (cmd == ND_CMD_CALL) {
1052                 unsigned long *mask;
1053
1054                 if (copy_from_user(&pkg, p, sizeof(pkg)))
1055                         return -EFAULT;
1056
1057                 if (nvdimm) {
1058                         if (pkg.nd_family > NVDIMM_FAMILY_MAX)
1059                                 return -EINVAL;
1060                         mask = &nd_desc->dimm_family_mask;
1061                 } else {
1062                         if (pkg.nd_family > NVDIMM_BUS_FAMILY_MAX)
1063                                 return -EINVAL;
1064                         mask = &nd_desc->bus_family_mask;
1065                 }
1066
1067                 if (!test_bit(pkg.nd_family, mask))
1068                         return -EINVAL;
1069         }
1070
1071         if (!desc ||
1072             (desc->out_num + desc->in_num == 0) ||
1073             cmd > ND_CMD_CALL ||
1074             !test_bit(cmd, &cmd_mask))
1075                 return -ENOTTY;
1076
1077         /* fail write commands (when read-only) */
1078         if (read_only)
1079                 switch (cmd) {
1080                 case ND_CMD_VENDOR:
1081                 case ND_CMD_SET_CONFIG_DATA:
1082                 case ND_CMD_ARS_START:
1083                 case ND_CMD_CLEAR_ERROR:
1084                 case ND_CMD_CALL:
1085                         dev_dbg(dev, "'%s' command while read-only.\n",
1086                                         nvdimm ? nvdimm_cmd_name(cmd)
1087                                         : nvdimm_bus_cmd_name(cmd));
1088                         return -EPERM;
1089                 default:
1090                         break;
1091                 }
1092
1093         /* process an input envelope */
1094         in_env = kzalloc(ND_CMD_MAX_ENVELOPE, GFP_KERNEL);
1095         if (!in_env)
1096                 return -ENOMEM;
1097         for (i = 0; i < desc->in_num; i++) {
1098                 u32 in_size, copy;
1099
1100                 in_size = nd_cmd_in_size(nvdimm, cmd, desc, i, in_env);
1101                 if (in_size == UINT_MAX) {
1102                         dev_err(dev, "%s:%s unknown input size cmd: %s field: %d\n",
1103                                         __func__, dimm_name, cmd_name, i);
1104                         rc = -ENXIO;
1105                         goto out;
1106                 }
1107                 if (in_len < ND_CMD_MAX_ENVELOPE)
1108                         copy = min_t(u32, ND_CMD_MAX_ENVELOPE - in_len, in_size);
1109                 else
1110                         copy = 0;
1111                 if (copy && copy_from_user(&in_env[in_len], p + in_len, copy)) {
1112                         rc = -EFAULT;
1113                         goto out;
1114                 }
1115                 in_len += in_size;
1116         }
1117
1118         if (cmd == ND_CMD_CALL) {
1119                 func = pkg.nd_command;
1120                 dev_dbg(dev, "%s, idx: %llu, in: %u, out: %u, len %llu\n",
1121                                 dimm_name, pkg.nd_command,
1122                                 in_len, out_len, buf_len);
1123         }
1124
1125         /* process an output envelope */
1126         out_env = kzalloc(ND_CMD_MAX_ENVELOPE, GFP_KERNEL);
1127         if (!out_env) {
1128                 rc = -ENOMEM;
1129                 goto out;
1130         }
1131
1132         for (i = 0; i < desc->out_num; i++) {
1133                 u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i,
1134                                 (u32 *) in_env, (u32 *) out_env, 0);
1135                 u32 copy;
1136
1137                 if (out_size == UINT_MAX) {
1138                         dev_dbg(dev, "%s unknown output size cmd: %s field: %d\n",
1139                                         dimm_name, cmd_name, i);
1140                         rc = -EFAULT;
1141                         goto out;
1142                 }
1143                 if (out_len < ND_CMD_MAX_ENVELOPE)
1144                         copy = min_t(u32, ND_CMD_MAX_ENVELOPE - out_len, out_size);
1145                 else
1146                         copy = 0;
1147                 if (copy && copy_from_user(&out_env[out_len],
1148                                         p + in_len + out_len, copy)) {
1149                         rc = -EFAULT;
1150                         goto out;
1151                 }
1152                 out_len += out_size;
1153         }
1154
1155         buf_len = (u64) out_len + (u64) in_len;
1156         if (buf_len > ND_IOCTL_MAX_BUFLEN) {
1157                 dev_dbg(dev, "%s cmd: %s buf_len: %llu > %d\n", dimm_name,
1158                                 cmd_name, buf_len, ND_IOCTL_MAX_BUFLEN);
1159                 rc = -EINVAL;
1160                 goto out;
1161         }
1162
1163         buf = vmalloc(buf_len);
1164         if (!buf) {
1165                 rc = -ENOMEM;
1166                 goto out;
1167         }
1168
1169         if (copy_from_user(buf, p, buf_len)) {
1170                 rc = -EFAULT;
1171                 goto out;
1172         }
1173
1174         nd_device_lock(dev);
1175         nvdimm_bus_lock(dev);
1176         rc = nd_cmd_clear_to_send(nvdimm_bus, nvdimm, func, buf);
1177         if (rc)
1178                 goto out_unlock;
1179
1180         rc = nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len, &cmd_rc);
1181         if (rc < 0)
1182                 goto out_unlock;
1183
1184         if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR && cmd_rc >= 0) {
1185                 struct nd_cmd_clear_error *clear_err = buf;
1186
1187                 nvdimm_account_cleared_poison(nvdimm_bus, clear_err->address,
1188                                 clear_err->cleared);
1189         }
1190
1191         if (copy_to_user(p, buf, buf_len))
1192                 rc = -EFAULT;
1193
1194 out_unlock:
1195         nvdimm_bus_unlock(dev);
1196         nd_device_unlock(dev);
1197 out:
1198         kfree(in_env);
1199         kfree(out_env);
1200         vfree(buf);
1201         return rc;
1202 }
1203
1204 enum nd_ioctl_mode {
1205         BUS_IOCTL,
1206         DIMM_IOCTL,
1207 };
1208
1209 static int match_dimm(struct device *dev, void *data)
1210 {
1211         long id = (long) data;
1212
1213         if (is_nvdimm(dev)) {
1214                 struct nvdimm *nvdimm = to_nvdimm(dev);
1215
1216                 return nvdimm->id == id;
1217         }
1218
1219         return 0;
1220 }
1221
1222 static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
1223                 enum nd_ioctl_mode mode)
1224
1225 {
1226         struct nvdimm_bus *nvdimm_bus, *found = NULL;
1227         long id = (long) file->private_data;
1228         struct nvdimm *nvdimm = NULL;
1229         int rc, ro;
1230
1231         ro = ((file->f_flags & O_ACCMODE) == O_RDONLY);
1232         mutex_lock(&nvdimm_bus_list_mutex);
1233         list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) {
1234                 if (mode == DIMM_IOCTL) {
1235                         struct device *dev;
1236
1237                         dev = device_find_child(&nvdimm_bus->dev,
1238                                         file->private_data, match_dimm);
1239                         if (!dev)
1240                                 continue;
1241                         nvdimm = to_nvdimm(dev);
1242                         found = nvdimm_bus;
1243                 } else if (nvdimm_bus->id == id) {
1244                         found = nvdimm_bus;
1245                 }
1246
1247                 if (found) {
1248                         atomic_inc(&nvdimm_bus->ioctl_active);
1249                         break;
1250                 }
1251         }
1252         mutex_unlock(&nvdimm_bus_list_mutex);
1253
1254         if (!found)
1255                 return -ENXIO;
1256
1257         nvdimm_bus = found;
1258         rc = __nd_ioctl(nvdimm_bus, nvdimm, ro, cmd, arg);
1259
1260         if (nvdimm)
1261                 put_device(&nvdimm->dev);
1262         if (atomic_dec_and_test(&nvdimm_bus->ioctl_active))
1263                 wake_up(&nvdimm_bus->wait);
1264
1265         return rc;
1266 }
1267
1268 static long bus_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1269 {
1270         return nd_ioctl(file, cmd, arg, BUS_IOCTL);
1271 }
1272
1273 static long dimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1274 {
1275         return nd_ioctl(file, cmd, arg, DIMM_IOCTL);
1276 }
1277
1278 static int nd_open(struct inode *inode, struct file *file)
1279 {
1280         long minor = iminor(inode);
1281
1282         file->private_data = (void *) minor;
1283         return 0;
1284 }
1285
1286 static const struct file_operations nvdimm_bus_fops = {
1287         .owner = THIS_MODULE,
1288         .open = nd_open,
1289         .unlocked_ioctl = bus_ioctl,
1290         .compat_ioctl = compat_ptr_ioctl,
1291         .llseek = noop_llseek,
1292 };
1293
1294 static const struct file_operations nvdimm_fops = {
1295         .owner = THIS_MODULE,
1296         .open = nd_open,
1297         .unlocked_ioctl = dimm_ioctl,
1298         .compat_ioctl = compat_ptr_ioctl,
1299         .llseek = noop_llseek,
1300 };
1301
1302 int __init nvdimm_bus_init(void)
1303 {
1304         int rc;
1305
1306         rc = bus_register(&nvdimm_bus_type);
1307         if (rc)
1308                 return rc;
1309
1310         rc = register_chrdev(0, "ndctl", &nvdimm_bus_fops);
1311         if (rc < 0)
1312                 goto err_bus_chrdev;
1313         nvdimm_bus_major = rc;
1314
1315         rc = register_chrdev(0, "dimmctl", &nvdimm_fops);
1316         if (rc < 0)
1317                 goto err_dimm_chrdev;
1318         nvdimm_major = rc;
1319
1320         nd_class = class_create(THIS_MODULE, "nd");
1321         if (IS_ERR(nd_class)) {
1322                 rc = PTR_ERR(nd_class);
1323                 goto err_class;
1324         }
1325
1326         rc = driver_register(&nd_bus_driver.drv);
1327         if (rc)
1328                 goto err_nd_bus;
1329
1330         return 0;
1331
1332  err_nd_bus:
1333         class_destroy(nd_class);
1334  err_class:
1335         unregister_chrdev(nvdimm_major, "dimmctl");
1336  err_dimm_chrdev:
1337         unregister_chrdev(nvdimm_bus_major, "ndctl");
1338  err_bus_chrdev:
1339         bus_unregister(&nvdimm_bus_type);
1340
1341         return rc;
1342 }
1343
1344 void nvdimm_bus_exit(void)
1345 {
1346         driver_unregister(&nd_bus_driver.drv);
1347         class_destroy(nd_class);
1348         unregister_chrdev(nvdimm_bus_major, "ndctl");
1349         unregister_chrdev(nvdimm_major, "dimmctl");
1350         bus_unregister(&nvdimm_bus_type);
1351         ida_destroy(&nd_ida);
1352 }