drivers/nvdimm/bus.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
   4  */
   5 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   6 #include <linux/libnvdimm.h>
   7 #include <linux/sched/mm.h>
   8 #include <linux/vmalloc.h>
   9 #include <linux/uaccess.h>
  10 #include <linux/module.h>
  11 #include <linux/blkdev.h>
  12 #include <linux/fcntl.h>
  13 #include <linux/async.h>
  14 #include <linux/ndctl.h>
  15 #include <linux/sched.h>
  16 #include <linux/slab.h>
  17 #include <linux/cpu.h>
  18 #include <linux/fs.h>
  19 #include <linux/io.h>
  20 #include <linux/mm.h>
  21 #include <linux/nd.h>
  22 #include "nd-core.h"
  23 #include "nd.h"
  24 #include "pfn.h"
  25
  26 int nvdimm_major;
  27 static int nvdimm_bus_major;
  28 static DEFINE_IDA(nd_ida);
  29
  30 static const struct class nd_class = {
  31         .name = "nd",
  32 };
  33
  34 static int to_nd_device_type(const struct device *dev)
  35 {
  36         if (is_nvdimm(dev))
  37                 return ND_DEVICE_DIMM;
  38         else if (is_memory(dev))
  39                 return ND_DEVICE_REGION_PMEM;
  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(const 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         rc = nd_drv->probe(dev);
  95         if ((rc == 0 || rc == -EOPNOTSUPP) &&
  96                         dev->parent && is_nd_region(dev->parent))
  97                 nd_region_advance_seeds(to_nd_region(dev->parent), dev);
  98         nvdimm_bus_probe_end(nvdimm_bus);
  99
 100         dev_dbg(&nvdimm_bus->dev, "END: %s.probe(%s) = %d\n", dev->driver->name,
 101                         dev_name(dev), rc);
 102
 103         if (rc != 0)
 104                 module_put(provider);
 105         return rc;
 106 }
 107
 108 static void nvdimm_bus_remove(struct device *dev)
 109 {
 110         struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
 111         struct module *provider = to_bus_provider(dev);
 112         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
 113
 114         if (nd_drv->remove)
 115                 nd_drv->remove(dev);
 116
 117         dev_dbg(&nvdimm_bus->dev, "%s.remove(%s)\n", dev->driver->name,
 118                         dev_name(dev));
 119         module_put(provider);
 120 }
 121
 122 static void nvdimm_bus_shutdown(struct device *dev)
 123 {
 124         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
 125         struct nd_device_driver *nd_drv = NULL;
 126
 127         if (dev->driver)
 128                 nd_drv = to_nd_device_driver(dev->driver);
 129
 130         if (nd_drv && nd_drv->shutdown) {
 131                 nd_drv->shutdown(dev);
 132                 dev_dbg(&nvdimm_bus->dev, "%s.shutdown(%s)\n",
 133                                 dev->driver->name, dev_name(dev));
 134         }
 135 }
 136
 137 void nd_device_notify(struct device *dev, enum nvdimm_event event)
 138 {
 139         device_lock(dev);
 140         if (dev->driver) {
 141                 struct nd_device_driver *nd_drv;
 142
 143                 nd_drv = to_nd_device_driver(dev->driver);
 144                 if (nd_drv->notify)
 145                         nd_drv->notify(dev, event);
 146         }
 147         device_unlock(dev);
 148 }
 149 EXPORT_SYMBOL(nd_device_notify);
 150
 151 void nvdimm_region_notify(struct nd_region *nd_region, enum nvdimm_event event)
 152 {
 153         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
 154
 155         if (!nvdimm_bus)
 156                 return;
 157
 158         /* caller is responsible for holding a reference on the device */
 159         nd_device_notify(&nd_region->dev, event);
 160 }
 161 EXPORT_SYMBOL_GPL(nvdimm_region_notify);
 162
 163 struct clear_badblocks_context {
 164         resource_size_t phys, cleared;
 165 };
 166
 167 static int nvdimm_clear_badblocks_region(struct device *dev, void *data)
 168 {
 169         struct clear_badblocks_context *ctx = data;
 170         struct nd_region *nd_region;
 171         resource_size_t ndr_end;
 172         sector_t sector;
 173
 174         /* make sure device is a region */
 175         if (!is_memory(dev))
 176                 return 0;
 177
 178         nd_region = to_nd_region(dev);
 179         ndr_end = nd_region->ndr_start + nd_region->ndr_size - 1;
 180
 181         /* make sure we are in the region */
 182         if (ctx->phys < nd_region->ndr_start ||
 183             (ctx->phys + ctx->cleared - 1) > ndr_end)
 184                 return 0;
 185
 186         sector = (ctx->phys - nd_region->ndr_start) / 512;
 187         badblocks_clear(&nd_region->bb, sector, ctx->cleared / 512);
 188
 189         if (nd_region->bb_state)
 190                 sysfs_notify_dirent(nd_region->bb_state);
 191
 192         return 0;
 193 }
 194
 195 static void nvdimm_clear_badblocks_regions(struct nvdimm_bus *nvdimm_bus,
 196                 phys_addr_t phys, u64 cleared)
 197 {
 198         struct clear_badblocks_context ctx = {
 199                 .phys = phys,
 200                 .cleared = cleared,
 201         };
 202
 203         device_for_each_child(&nvdimm_bus->dev, &ctx,
 204                         nvdimm_clear_badblocks_region);
 205 }
 206
 207 static void nvdimm_account_cleared_poison(struct nvdimm_bus *nvdimm_bus,
 208                 phys_addr_t phys, u64 cleared)
 209 {
 210         if (cleared > 0)
 211                 badrange_forget(&nvdimm_bus->badrange, phys, cleared);
 212
 213         if (cleared > 0 && cleared / 512)
 214                 nvdimm_clear_badblocks_regions(nvdimm_bus, phys, cleared);
 215 }
 216
 217 long nvdimm_clear_poison(struct device *dev, phys_addr_t phys,
 218                 unsigned int len)
 219 {
 220         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
 221         struct nvdimm_bus_descriptor *nd_desc;
 222         struct nd_cmd_clear_error clear_err;
 223         struct nd_cmd_ars_cap ars_cap;
 224         u32 clear_err_unit, mask;
 225         unsigned int noio_flag;
 226         int cmd_rc, rc;
 227
 228         if (!nvdimm_bus)
 229                 return -ENXIO;
 230
 231         nd_desc = nvdimm_bus->nd_desc;
 232         /*
 233          * if ndctl does not exist, it's PMEM_LEGACY and
 234          * we want to just pretend everything is handled.
 235          */
 236         if (!nd_desc->ndctl)
 237                 return len;
 238
 239         memset(&ars_cap, 0, sizeof(ars_cap));
 240         ars_cap.address = phys;
 241         ars_cap.length = len;
 242         noio_flag = memalloc_noio_save();
 243         rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, &ars_cap,
 244                         sizeof(ars_cap), &cmd_rc);
 245         memalloc_noio_restore(noio_flag);
 246         if (rc < 0)
 247                 return rc;
 248         if (cmd_rc < 0)
 249                 return cmd_rc;
 250         clear_err_unit = ars_cap.clear_err_unit;
 251         if (!clear_err_unit || !is_power_of_2(clear_err_unit))
 252                 return -ENXIO;
 253
 254         mask = clear_err_unit - 1;
 255         if ((phys | len) & mask)
 256                 return -ENXIO;
 257         memset(&clear_err, 0, sizeof(clear_err));
 258         clear_err.address = phys;
 259         clear_err.length = len;
 260         noio_flag = memalloc_noio_save();
 261         rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_CLEAR_ERROR, &clear_err,
 262                         sizeof(clear_err), &cmd_rc);
 263         memalloc_noio_restore(noio_flag);
 264         if (rc < 0)
 265                 return rc;
 266         if (cmd_rc < 0)
 267                 return cmd_rc;
 268
 269         nvdimm_account_cleared_poison(nvdimm_bus, phys, clear_err.cleared);
 270
 271         return clear_err.cleared;
 272 }
 273 EXPORT_SYMBOL_GPL(nvdimm_clear_poison);
 274
 275 static int nvdimm_bus_match(struct device *dev, const struct device_driver *drv);
 276
 277 static const struct bus_type nvdimm_bus_type = {
 278         .name = "nd",
 279         .uevent = nvdimm_bus_uevent,
 280         .match = nvdimm_bus_match,
 281         .probe = nvdimm_bus_probe,
 282         .remove = nvdimm_bus_remove,
 283         .shutdown = nvdimm_bus_shutdown,
 284 };
 285
 286 static void nvdimm_bus_release(struct device *dev)
 287 {
 288         struct nvdimm_bus *nvdimm_bus;
 289
 290         nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
 291         ida_free(&nd_ida, nvdimm_bus->id);
 292         kfree(nvdimm_bus);
 293 }
 294
 295 static const struct device_type nvdimm_bus_dev_type = {
 296         .release = nvdimm_bus_release,
 297         .groups = nvdimm_bus_attribute_groups,
 298 };
 299
 300 bool is_nvdimm_bus(struct device *dev)
 301 {
 302         return dev->type == &nvdimm_bus_dev_type;
 303 }
 304
 305 struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev)
 306 {
 307         struct device *dev;
 308
 309         for (dev = nd_dev; dev; dev = dev->parent)
 310                 if (is_nvdimm_bus(dev))
 311                         break;
 312         dev_WARN_ONCE(nd_dev, !dev, "invalid dev, not on nd bus\n");
 313         if (dev)
 314                 return to_nvdimm_bus(dev);
 315         return NULL;
 316 }
 317
 318 struct nvdimm_bus *to_nvdimm_bus(struct device *dev)
 319 {
 320         struct nvdimm_bus *nvdimm_bus;
 321
 322         nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
 323         WARN_ON(!is_nvdimm_bus(dev));
 324         return nvdimm_bus;
 325 }
 326 EXPORT_SYMBOL_GPL(to_nvdimm_bus);
 327
 328 struct nvdimm_bus *nvdimm_to_bus(struct nvdimm *nvdimm)
 329 {
 330         return to_nvdimm_bus(nvdimm->dev.parent);
 331 }
 332 EXPORT_SYMBOL_GPL(nvdimm_to_bus);
 333
 334 static struct lock_class_key nvdimm_bus_key;
 335
 336 struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
 337                 struct nvdimm_bus_descriptor *nd_desc)
 338 {
 339         struct nvdimm_bus *nvdimm_bus;
 340         int rc;
 341
 342         nvdimm_bus = kzalloc(sizeof(*nvdimm_bus), GFP_KERNEL);
 343         if (!nvdimm_bus)
 344                 return NULL;
 345         INIT_LIST_HEAD(&nvdimm_bus->list);
 346         INIT_LIST_HEAD(&nvdimm_bus->mapping_list);
 347         init_waitqueue_head(&nvdimm_bus->wait);
 348         nvdimm_bus->id = ida_alloc(&nd_ida, GFP_KERNEL);
 349         if (nvdimm_bus->id < 0) {
 350                 kfree(nvdimm_bus);
 351                 return NULL;
 352         }
 353         mutex_init(&nvdimm_bus->reconfig_mutex);
 354         badrange_init(&nvdimm_bus->badrange);
 355         nvdimm_bus->nd_desc = nd_desc;
 356         nvdimm_bus->dev.parent = parent;
 357         nvdimm_bus->dev.type = &nvdimm_bus_dev_type;
 358         nvdimm_bus->dev.groups = nd_desc->attr_groups;
 359         nvdimm_bus->dev.bus = &nvdimm_bus_type;
 360         nvdimm_bus->dev.of_node = nd_desc->of_node;
 361         device_initialize(&nvdimm_bus->dev);
 362         lockdep_set_class(&nvdimm_bus->dev.mutex, &nvdimm_bus_key);
 363         device_set_pm_not_required(&nvdimm_bus->dev);
 364         rc = dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id);
 365         if (rc)
 366                 goto err;
 367
 368         rc = device_add(&nvdimm_bus->dev);
 369         if (rc) {
 370                 dev_dbg(&nvdimm_bus->dev, "registration failed: %d\n", rc);
 371                 goto err;
 372         }
 373
 374         return nvdimm_bus;
 375  err:
 376         put_device(&nvdimm_bus->dev);
 377         return NULL;
 378 }
 379 EXPORT_SYMBOL_GPL(nvdimm_bus_register);
 380
 381 void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)
 382 {
 383         if (!nvdimm_bus)
 384                 return;
 385         device_unregister(&nvdimm_bus->dev);
 386 }
 387 EXPORT_SYMBOL_GPL(nvdimm_bus_unregister);
 388
 389 static int child_unregister(struct device *dev, void *data)
 390 {
 391         /*
 392          * the singular ndctl class device per bus needs to be
 393          * "device_destroy"ed, so skip it here
 394          *
 395          * i.e. remove classless children
 396          */
 397         if (dev->class)
 398                 return 0;
 399
 400         if (is_nvdimm(dev))
 401                 nvdimm_delete(to_nvdimm(dev));
 402         else
 403                 nd_device_unregister(dev, ND_SYNC);
 404
 405         return 0;
 406 }
 407
 408 static void free_badrange_list(struct list_head *badrange_list)
 409 {
 410         struct badrange_entry *bre, *next;
 411
 412         list_for_each_entry_safe(bre, next, badrange_list, list) {
 413                 list_del(&bre->list);
 414                 kfree(bre);
 415         }
 416         list_del_init(badrange_list);
 417 }
 418
 419 static void nd_bus_remove(struct device *dev)
 420 {
 421         struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
 422
 423         mutex_lock(&nvdimm_bus_list_mutex);
 424         list_del_init(&nvdimm_bus->list);
 425         mutex_unlock(&nvdimm_bus_list_mutex);
 426
 427         wait_event(nvdimm_bus->wait,
 428                         atomic_read(&nvdimm_bus->ioctl_active) == 0);
 429
 430         nd_synchronize();
 431         device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister);
 432
 433         spin_lock(&nvdimm_bus->badrange.lock);
 434         free_badrange_list(&nvdimm_bus->badrange.list);
 435         spin_unlock(&nvdimm_bus->badrange.lock);
 436
 437         nvdimm_bus_destroy_ndctl(nvdimm_bus);
 438 }
 439
 440 static int nd_bus_probe(struct device *dev)
 441 {
 442         struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
 443         int rc;
 444
 445         rc = nvdimm_bus_create_ndctl(nvdimm_bus);
 446         if (rc)
 447                 return rc;
 448
 449         mutex_lock(&nvdimm_bus_list_mutex);
 450         list_add_tail(&nvdimm_bus->list, &nvdimm_bus_list);
 451         mutex_unlock(&nvdimm_bus_list_mutex);
 452
 453         /* enable bus provider attributes to look up their local context */
 454         dev_set_drvdata(dev, nvdimm_bus->nd_desc);
 455
 456         return 0;
 457 }
 458
 459 static struct nd_device_driver nd_bus_driver = {
 460         .probe = nd_bus_probe,
 461         .remove = nd_bus_remove,
 462         .drv = {
 463                 .name = "nd_bus",
 464                 .suppress_bind_attrs = true,
 465                 .bus = &nvdimm_bus_type,
 466                 .owner = THIS_MODULE,
 467                 .mod_name = KBUILD_MODNAME,
 468         },
 469 };
 470
 471 static int nvdimm_bus_match(struct device *dev, const struct device_driver *drv)
 472 {
 473         const struct nd_device_driver *nd_drv = to_nd_device_driver(drv);
 474
 475         if (is_nvdimm_bus(dev) && nd_drv == &nd_bus_driver)
 476                 return true;
 477
 478         return !!test_bit(to_nd_device_type(dev), &nd_drv->type);
 479 }
 480
 481 static ASYNC_DOMAIN_EXCLUSIVE(nd_async_domain);
 482
 483 void nd_synchronize(void)
 484 {
 485         async_synchronize_full_domain(&nd_async_domain);
 486 }
 487 EXPORT_SYMBOL_GPL(nd_synchronize);
 488
 489 static void nd_async_device_register(void *d, async_cookie_t cookie)
 490 {
 491         struct device *dev = d;
 492
 493         if (device_add(dev) != 0) {
 494                 dev_err(dev, "%s: failed\n", __func__);
 495                 put_device(dev);
 496         }
 497         put_device(dev);
 498         if (dev->parent)
 499                 put_device(dev->parent);
 500 }
 501
 502 static void nd_async_device_unregister(void *d, async_cookie_t cookie)
 503 {
 504         struct device *dev = d;
 505
 506         /* flush bus operations before delete */
 507         nvdimm_bus_lock(dev);
 508         nvdimm_bus_unlock(dev);
 509
 510         device_unregister(dev);
 511         put_device(dev);
 512 }
 513
 514 static void __nd_device_register(struct device *dev, bool sync)
 515 {
 516         if (!dev)
 517                 return;
 518
 519         /*
 520          * Ensure that region devices always have their NUMA node set as
 521          * early as possible. This way we are able to make certain that
 522          * any memory associated with the creation and the creation
 523          * itself of the region is associated with the correct node.
 524          */
 525         if (is_nd_region(dev))
 526                 set_dev_node(dev, to_nd_region(dev)->numa_node);
 527
 528         dev->bus = &nvdimm_bus_type;
 529         device_set_pm_not_required(dev);
 530         if (dev->parent) {
 531                 get_device(dev->parent);
 532                 if (dev_to_node(dev) == NUMA_NO_NODE)
 533                         set_dev_node(dev, dev_to_node(dev->parent));
 534         }
 535         get_device(dev);
 536
 537         if (sync)
 538                 nd_async_device_register(dev, 0);
 539         else
 540                 async_schedule_dev_domain(nd_async_device_register, dev,
 541                                           &nd_async_domain);
 542 }
 543
 544 void nd_device_register(struct device *dev)
 545 {
 546         __nd_device_register(dev, false);
 547 }
 548 EXPORT_SYMBOL(nd_device_register);
 549
 550 void nd_device_register_sync(struct device *dev)
 551 {
 552         __nd_device_register(dev, true);
 553 }
 554
 555 void nd_device_unregister(struct device *dev, enum nd_async_mode mode)
 556 {
 557         bool killed;
 558
 559         switch (mode) {
 560         case ND_ASYNC:
 561                 /*
 562                  * In the async case this is being triggered with the
 563                  * device lock held and the unregistration work needs to
 564                  * be moved out of line iff this is thread has won the
 565                  * race to schedule the deletion.
 566                  */
 567                 if (!kill_device(dev))
 568                         return;
 569
 570                 get_device(dev);
 571                 async_schedule_domain(nd_async_device_unregister, dev,
 572                                 &nd_async_domain);
 573                 break;
 574         case ND_SYNC:
 575                 /*
 576                  * In the sync case the device is being unregistered due
 577                  * to a state change of the parent. Claim the kill state
 578                  * to synchronize against other unregistration requests,
 579                  * or otherwise let the async path handle it if the
 580                  * unregistration was already queued.
 581                  */
 582                 device_lock(dev);
 583                 killed = kill_device(dev);
 584                 device_unlock(dev);
 585
 586                 if (!killed)
 587                         return;
 588
 589                 nd_synchronize();
 590                 device_unregister(dev);
 591                 break;
 592         }
 593 }
 594 EXPORT_SYMBOL(nd_device_unregister);
 595
 596 /**
 597  * __nd_driver_register() - register a region or a namespace driver
 598  * @nd_drv: driver to register
 599  * @owner: automatically set by nd_driver_register() macro
 600  * @mod_name: automatically set by nd_driver_register() macro
 601  */
 602 int __nd_driver_register(struct nd_device_driver *nd_drv, struct module *owner,
 603                 const char *mod_name)
 604 {
 605         struct device_driver *drv = &nd_drv->drv;
 606
 607         if (!nd_drv->type) {
 608                 pr_debug("driver type bitmask not set (%ps)\n",
 609                                 __builtin_return_address(0));
 610                 return -EINVAL;
 611         }
 612
 613         if (!nd_drv->probe) {
 614                 pr_debug("%s ->probe() must be specified\n", mod_name);
 615                 return -EINVAL;
 616         }
 617
 618         drv->bus = &nvdimm_bus_type;
 619         drv->owner = owner;
 620         drv->mod_name = mod_name;
 621
 622         return driver_register(drv);
 623 }
 624 EXPORT_SYMBOL(__nd_driver_register);
 625
 626 void nvdimm_check_and_set_ro(struct gendisk *disk)
 627 {
 628         struct device *dev = disk_to_dev(disk)->parent;
 629         struct nd_region *nd_region = to_nd_region(dev->parent);
 630         int disk_ro = get_disk_ro(disk);
 631
 632         /* catch the disk up with the region ro state */
 633         if (disk_ro == nd_region->ro)
 634                 return;
 635
 636         dev_info(dev, "%s read-%s, marking %s read-%s\n",
 637                  dev_name(&nd_region->dev), nd_region->ro ? "only" : "write",
 638                  disk->disk_name, nd_region->ro ? "only" : "write");
 639         set_disk_ro(disk, nd_region->ro);
 640 }
 641 EXPORT_SYMBOL(nvdimm_check_and_set_ro);
 642
 643 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
 644                 char *buf)
 645 {
 646         return sprintf(buf, ND_DEVICE_MODALIAS_FMT "\n",
 647                         to_nd_device_type(dev));
 648 }
 649 static DEVICE_ATTR_RO(modalias);
 650
 651 static ssize_t devtype_show(struct device *dev, struct device_attribute *attr,
 652                 char *buf)
 653 {
 654         return sprintf(buf, "%s\n", dev->type->name);
 655 }
 656 static DEVICE_ATTR_RO(devtype);
 657
 658 static struct attribute *nd_device_attributes[] = {
 659         &dev_attr_modalias.attr,
 660         &dev_attr_devtype.attr,
 661         NULL,
 662 };
 663
 664 /*
 665  * nd_device_attribute_group - generic attributes for all devices on an nd bus
 666  */
 667 const struct attribute_group nd_device_attribute_group = {
 668         .attrs = nd_device_attributes,
 669 };
 670
 671 static ssize_t numa_node_show(struct device *dev,
 672                 struct device_attribute *attr, char *buf)
 673 {
 674         return sprintf(buf, "%d\n", dev_to_node(dev));
 675 }
 676 static DEVICE_ATTR_RO(numa_node);
 677
 678 static int nvdimm_dev_to_target_node(struct device *dev)
 679 {
 680         struct device *parent = dev->parent;
 681         struct nd_region *nd_region = NULL;
 682
 683         if (is_nd_region(dev))
 684                 nd_region = to_nd_region(dev);
 685         else if (parent && is_nd_region(parent))
 686                 nd_region = to_nd_region(parent);
 687
 688         if (!nd_region)
 689                 return NUMA_NO_NODE;
 690         return nd_region->target_node;
 691 }
 692
 693 static ssize_t target_node_show(struct device *dev,
 694                 struct device_attribute *attr, char *buf)
 695 {
 696         return sprintf(buf, "%d\n", nvdimm_dev_to_target_node(dev));
 697 }
 698 static DEVICE_ATTR_RO(target_node);
 699
 700 static struct attribute *nd_numa_attributes[] = {
 701         &dev_attr_numa_node.attr,
 702         &dev_attr_target_node.attr,
 703         NULL,
 704 };
 705
 706 static umode_t nd_numa_attr_visible(struct kobject *kobj, struct attribute *a,
 707                 int n)
 708 {
 709         struct device *dev = container_of(kobj, typeof(*dev), kobj);
 710
 711         if (!IS_ENABLED(CONFIG_NUMA))
 712                 return 0;
 713
 714         if (a == &dev_attr_target_node.attr &&
 715                         nvdimm_dev_to_target_node(dev) == NUMA_NO_NODE)
 716                 return 0;
 717
 718         return a->mode;
 719 }
 720
 721 /*
 722  * nd_numa_attribute_group - NUMA attributes for all devices on an nd bus
 723  */
 724 const struct attribute_group nd_numa_attribute_group = {
 725         .attrs = nd_numa_attributes,
 726         .is_visible = nd_numa_attr_visible,
 727 };
 728
 729 static void ndctl_release(struct device *dev)
 730 {
 731         kfree(dev);
 732 }
 733
 734 static struct lock_class_key nvdimm_ndctl_key;
 735
 736 int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus)
 737 {
 738         dev_t devt = MKDEV(nvdimm_bus_major, nvdimm_bus->id);
 739         struct device *dev;
 740         int rc;
 741
 742         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 743         if (!dev)
 744                 return -ENOMEM;
 745         device_initialize(dev);
 746         lockdep_set_class(&dev->mutex, &nvdimm_ndctl_key);
 747         device_set_pm_not_required(dev);
 748         dev->class = &nd_class;
 749         dev->parent = &nvdimm_bus->dev;
 750         dev->devt = devt;
 751         dev->release = ndctl_release;
 752         rc = dev_set_name(dev, "ndctl%d", nvdimm_bus->id);
 753         if (rc)
 754                 goto err;
 755
 756         rc = device_add(dev);
 757         if (rc) {
 758                 dev_dbg(&nvdimm_bus->dev, "failed to register ndctl%d: %d\n",
 759                                 nvdimm_bus->id, rc);
 760                 goto err;
 761         }
 762         return 0;
 763
 764 err:
 765         put_device(dev);
 766         return rc;
 767 }
 768
 769 void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus)
 770 {
 771         device_destroy(&nd_class, MKDEV(nvdimm_bus_major, nvdimm_bus->id));
 772 }
 773
 774 static const struct nd_cmd_desc __nd_cmd_dimm_descs[] = {
 775         [ND_CMD_IMPLEMENTED] = { },
 776         [ND_CMD_SMART] = {
 777                 .out_num = 2,
 778                 .out_sizes = { 4, 128, },
 779         },
 780         [ND_CMD_SMART_THRESHOLD] = {
 781                 .out_num = 2,
 782                 .out_sizes = { 4, 8, },
 783         },
 784         [ND_CMD_DIMM_FLAGS] = {
 785                 .out_num = 2,
 786                 .out_sizes = { 4, 4 },
 787         },
 788         [ND_CMD_GET_CONFIG_SIZE] = {
 789                 .out_num = 3,
 790                 .out_sizes = { 4, 4, 4, },
 791         },
 792         [ND_CMD_GET_CONFIG_DATA] = {
 793                 .in_num = 2,
 794                 .in_sizes = { 4, 4, },
 795                 .out_num = 2,
 796                 .out_sizes = { 4, UINT_MAX, },
 797         },
 798         [ND_CMD_SET_CONFIG_DATA] = {
 799                 .in_num = 3,
 800                 .in_sizes = { 4, 4, UINT_MAX, },
 801                 .out_num = 1,
 802                 .out_sizes = { 4, },
 803         },
 804         [ND_CMD_VENDOR] = {
 805                 .in_num = 3,
 806                 .in_sizes = { 4, 4, UINT_MAX, },
 807                 .out_num = 3,
 808                 .out_sizes = { 4, 4, UINT_MAX, },
 809         },
 810         [ND_CMD_CALL] = {
 811                 .in_num = 2,
 812                 .in_sizes = { sizeof(struct nd_cmd_pkg), UINT_MAX, },
 813                 .out_num = 1,
 814                 .out_sizes = { UINT_MAX, },
 815         },
 816 };
 817
 818 const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd)
 819 {
 820         if (cmd < ARRAY_SIZE(__nd_cmd_dimm_descs))
 821                 return &__nd_cmd_dimm_descs[cmd];
 822         return NULL;
 823 }
 824 EXPORT_SYMBOL_GPL(nd_cmd_dimm_desc);
 825
 826 static const struct nd_cmd_desc __nd_cmd_bus_descs[] = {
 827         [ND_CMD_IMPLEMENTED] = { },
 828         [ND_CMD_ARS_CAP] = {
 829                 .in_num = 2,
 830                 .in_sizes = { 8, 8, },
 831                 .out_num = 4,
 832                 .out_sizes = { 4, 4, 4, 4, },
 833         },
 834         [ND_CMD_ARS_START] = {
 835                 .in_num = 5,
 836                 .in_sizes = { 8, 8, 2, 1, 5, },
 837                 .out_num = 2,
 838                 .out_sizes = { 4, 4, },
 839         },
 840         [ND_CMD_ARS_STATUS] = {
 841                 .out_num = 3,
 842                 .out_sizes = { 4, 4, UINT_MAX, },
 843         },
 844         [ND_CMD_CLEAR_ERROR] = {
 845                 .in_num = 2,
 846                 .in_sizes = { 8, 8, },
 847                 .out_num = 3,
 848                 .out_sizes = { 4, 4, 8, },
 849         },
 850         [ND_CMD_CALL] = {
 851                 .in_num = 2,
 852                 .in_sizes = { sizeof(struct nd_cmd_pkg), UINT_MAX, },
 853                 .out_num = 1,
 854                 .out_sizes = { UINT_MAX, },
 855         },
 856 };
 857
 858 const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd)
 859 {
 860         if (cmd < ARRAY_SIZE(__nd_cmd_bus_descs))
 861                 return &__nd_cmd_bus_descs[cmd];
 862         return NULL;
 863 }
 864 EXPORT_SYMBOL_GPL(nd_cmd_bus_desc);
 865
 866 u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
 867                 const struct nd_cmd_desc *desc, int idx, void *buf)
 868 {
 869         if (idx >= desc->in_num)
 870                 return UINT_MAX;
 871
 872         if (desc->in_sizes[idx] < UINT_MAX)
 873                 return desc->in_sizes[idx];
 874
 875         if (nvdimm && cmd == ND_CMD_SET_CONFIG_DATA && idx == 2) {
 876                 struct nd_cmd_set_config_hdr *hdr = buf;
 877
 878                 return hdr->in_length;
 879         } else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) {
 880                 struct nd_cmd_vendor_hdr *hdr = buf;
 881
 882                 return hdr->in_length;
 883         } else if (cmd == ND_CMD_CALL) {
 884                 struct nd_cmd_pkg *pkg = buf;
 885
 886                 return pkg->nd_size_in;
 887         }
 888
 889         return UINT_MAX;
 890 }
 891 EXPORT_SYMBOL_GPL(nd_cmd_in_size);
 892
 893 u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
 894                 const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
 895                 const u32 *out_field, unsigned long remainder)
 896 {
 897         if (idx >= desc->out_num)
 898                 return UINT_MAX;
 899
 900         if (desc->out_sizes[idx] < UINT_MAX)
 901                 return desc->out_sizes[idx];
 902
 903         if (nvdimm && cmd == ND_CMD_GET_CONFIG_DATA && idx == 1)
 904                 return in_field[1];
 905         else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2)
 906                 return out_field[1];
 907         else if (!nvdimm && cmd == ND_CMD_ARS_STATUS && idx == 2) {
 908                 /*
 909                  * Per table 9-276 ARS Data in ACPI 6.1, out_field[1] is
 910                  * "Size of Output Buffer in bytes, including this
 911                  * field."
 912                  */
 913                 if (out_field[1] < 4)
 914                         return 0;
 915                 /*
 916                  * ACPI 6.1 is ambiguous if 'status' is included in the
 917                  * output size. If we encounter an output size that
 918                  * overshoots the remainder by 4 bytes, assume it was
 919                  * including 'status'.
 920                  */
 921                 if (out_field[1] - 4 == remainder)
 922                         return remainder;
 923                 return out_field[1] - 8;
 924         } else if (cmd == ND_CMD_CALL) {
 925                 struct nd_cmd_pkg *pkg = (struct nd_cmd_pkg *) in_field;
 926
 927                 return pkg->nd_size_out;
 928         }
 929
 930
 931         return UINT_MAX;
 932 }
 933 EXPORT_SYMBOL_GPL(nd_cmd_out_size);
 934
 935 void wait_nvdimm_bus_probe_idle(struct device *dev)
 936 {
 937         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
 938
 939         do {
 940                 if (nvdimm_bus->probe_active == 0)
 941                         break;
 942                 nvdimm_bus_unlock(dev);
 943                 device_unlock(dev);
 944                 wait_event(nvdimm_bus->wait,
 945                                 nvdimm_bus->probe_active == 0);
 946                 device_lock(dev);
 947                 nvdimm_bus_lock(dev);
 948         } while (true);
 949 }
 950
 951 static int nd_pmem_forget_poison_check(struct device *dev, void *data)
 952 {
 953         struct nd_cmd_clear_error *clear_err =
 954                 (struct nd_cmd_clear_error *)data;
 955         struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL;
 956         struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL;
 957         struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL;
 958         struct nd_namespace_common *ndns = NULL;
 959         struct nd_namespace_io *nsio;
 960         resource_size_t offset = 0, end_trunc = 0, start, end, pstart, pend;
 961
 962         if (nd_dax || !dev->driver)
 963                 return 0;
 964
 965         start = clear_err->address;
 966         end = clear_err->address + clear_err->cleared - 1;
 967
 968         if (nd_btt || nd_pfn || nd_dax) {
 969                 if (nd_btt)
 970                         ndns = nd_btt->ndns;
 971                 else if (nd_pfn)
 972                         ndns = nd_pfn->ndns;
 973                 else if (nd_dax)
 974                         ndns = nd_dax->nd_pfn.ndns;
 975
 976                 if (!ndns)
 977                         return 0;
 978         } else
 979                 ndns = to_ndns(dev);
 980
 981         nsio = to_nd_namespace_io(&ndns->dev);
 982         pstart = nsio->res.start + offset;
 983         pend = nsio->res.end - end_trunc;
 984
 985         if ((pstart >= start) && (pend <= end))
 986                 return -EBUSY;
 987
 988         return 0;
 989
 990 }
 991
 992 static int nd_ns_forget_poison_check(struct device *dev, void *data)
 993 {
 994         return device_for_each_child(dev, data, nd_pmem_forget_poison_check);
 995 }
 996
 997 /* set_config requires an idle interleave set */
 998 static int nd_cmd_clear_to_send(struct nvdimm_bus *nvdimm_bus,
 999                 struct nvdimm *nvdimm, unsigned int cmd, void *data)
1000 {
1001         struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
1002
1003         /* ask the bus provider if it would like to block this request */
1004         if (nd_desc->clear_to_send) {
1005                 int rc = nd_desc->clear_to_send(nd_desc, nvdimm, cmd, data);
1006
1007                 if (rc)
1008                         return rc;
1009         }
1010
1011         /* require clear error to go through the pmem driver */
1012         if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR)
1013                 return device_for_each_child(&nvdimm_bus->dev, data,
1014                                 nd_ns_forget_poison_check);
1015
1016         if (!nvdimm || cmd != ND_CMD_SET_CONFIG_DATA)
1017                 return 0;
1018
1019         /* prevent label manipulation while the kernel owns label updates */
1020         wait_nvdimm_bus_probe_idle(&nvdimm_bus->dev);
1021         if (atomic_read(&nvdimm->busy))
1022                 return -EBUSY;
1023         return 0;
1024 }
1025
1026 static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
1027                 int read_only, unsigned int ioctl_cmd, unsigned long arg)
1028 {
1029         struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
1030         const struct nd_cmd_desc *desc = NULL;
1031         unsigned int cmd = _IOC_NR(ioctl_cmd);
1032         struct device *dev = &nvdimm_bus->dev;
1033         void __user *p = (void __user *) arg;
1034         char *out_env = NULL, *in_env = NULL;
1035         const char *cmd_name, *dimm_name;
1036         u32 in_len = 0, out_len = 0;
1037         unsigned int func = cmd;
1038         unsigned long cmd_mask;
1039         struct nd_cmd_pkg pkg;
1040         int rc, i, cmd_rc;
1041         void *buf = NULL;
1042         u64 buf_len = 0;
1043
1044         if (nvdimm) {
1045                 desc = nd_cmd_dimm_desc(cmd);
1046                 cmd_name = nvdimm_cmd_name(cmd);
1047                 cmd_mask = nvdimm->cmd_mask;
1048                 dimm_name = dev_name(&nvdimm->dev);
1049         } else {
1050                 desc = nd_cmd_bus_desc(cmd);
1051                 cmd_name = nvdimm_bus_cmd_name(cmd);
1052                 cmd_mask = nd_desc->cmd_mask;
1053                 dimm_name = "bus";
1054         }
1055
1056         /* Validate command family support against bus declared support */
1057         if (cmd == ND_CMD_CALL) {
1058                 unsigned long *mask;
1059
1060                 if (copy_from_user(&pkg, p, sizeof(pkg)))
1061                         return -EFAULT;
1062
1063                 if (nvdimm) {
1064                         if (pkg.nd_family > NVDIMM_FAMILY_MAX)
1065                                 return -EINVAL;
1066                         mask = &nd_desc->dimm_family_mask;
1067                 } else {
1068                         if (pkg.nd_family > NVDIMM_BUS_FAMILY_MAX)
1069                                 return -EINVAL;
1070                         mask = &nd_desc->bus_family_mask;
1071                 }
1072
1073                 if (!test_bit(pkg.nd_family, mask))
1074                         return -EINVAL;
1075         }
1076
1077         if (!desc ||
1078             (desc->out_num + desc->in_num == 0) ||
1079             cmd > ND_CMD_CALL ||
1080             !test_bit(cmd, &cmd_mask))
1081                 return -ENOTTY;
1082
1083         /* fail write commands (when read-only) */
1084         if (read_only)
1085                 switch (cmd) {
1086                 case ND_CMD_VENDOR:
1087                 case ND_CMD_SET_CONFIG_DATA:
1088                 case ND_CMD_ARS_START:
1089                 case ND_CMD_CLEAR_ERROR:
1090                 case ND_CMD_CALL:
1091                         dev_dbg(dev, "'%s' command while read-only.\n",
1092                                         nvdimm ? nvdimm_cmd_name(cmd)
1093                                         : nvdimm_bus_cmd_name(cmd));
1094                         return -EPERM;
1095                 default:
1096                         break;
1097                 }
1098
1099         /* process an input envelope */
1100         in_env = kzalloc(ND_CMD_MAX_ENVELOPE, GFP_KERNEL);
1101         if (!in_env)
1102                 return -ENOMEM;
1103         for (i = 0; i < desc->in_num; i++) {
1104                 u32 in_size, copy;
1105
1106                 in_size = nd_cmd_in_size(nvdimm, cmd, desc, i, in_env);
1107                 if (in_size == UINT_MAX) {
1108                         dev_err(dev, "%s:%s unknown input size cmd: %s field: %d\n",
1109                                         __func__, dimm_name, cmd_name, i);
1110                         rc = -ENXIO;
1111                         goto out;
1112                 }
1113                 if (in_len < ND_CMD_MAX_ENVELOPE)
1114                         copy = min_t(u32, ND_CMD_MAX_ENVELOPE - in_len, in_size);
1115                 else
1116                         copy = 0;
1117                 if (copy && copy_from_user(&in_env[in_len], p + in_len, copy)) {
1118                         rc = -EFAULT;
1119                         goto out;
1120                 }
1121                 in_len += in_size;
1122         }
1123
1124         if (cmd == ND_CMD_CALL) {
1125                 func = pkg.nd_command;
1126                 dev_dbg(dev, "%s, idx: %llu, in: %u, out: %u, len %llu\n",
1127                                 dimm_name, pkg.nd_command,
1128                                 in_len, out_len, buf_len);
1129         }
1130
1131         /* process an output envelope */
1132         out_env = kzalloc(ND_CMD_MAX_ENVELOPE, GFP_KERNEL);
1133         if (!out_env) {
1134                 rc = -ENOMEM;
1135                 goto out;
1136         }
1137
1138         for (i = 0; i < desc->out_num; i++) {
1139                 u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i,
1140                                 (u32 *) in_env, (u32 *) out_env, 0);
1141                 u32 copy;
1142
1143                 if (out_size == UINT_MAX) {
1144                         dev_dbg(dev, "%s unknown output size cmd: %s field: %d\n",
1145                                         dimm_name, cmd_name, i);
1146                         rc = -EFAULT;
1147                         goto out;
1148                 }
1149                 if (out_len < ND_CMD_MAX_ENVELOPE)
1150                         copy = min_t(u32, ND_CMD_MAX_ENVELOPE - out_len, out_size);
1151                 else
1152                         copy = 0;
1153                 if (copy && copy_from_user(&out_env[out_len],
1154                                         p + in_len + out_len, copy)) {
1155                         rc = -EFAULT;
1156                         goto out;
1157                 }
1158                 out_len += out_size;
1159         }
1160
1161         buf_len = (u64) out_len + (u64) in_len;
1162         if (buf_len > ND_IOCTL_MAX_BUFLEN) {
1163                 dev_dbg(dev, "%s cmd: %s buf_len: %llu > %d\n", dimm_name,
1164                                 cmd_name, buf_len, ND_IOCTL_MAX_BUFLEN);
1165                 rc = -EINVAL;
1166                 goto out;
1167         }
1168
1169         buf = vmalloc(buf_len);
1170         if (!buf) {
1171                 rc = -ENOMEM;
1172                 goto out;
1173         }
1174
1175         if (copy_from_user(buf, p, buf_len)) {
1176                 rc = -EFAULT;
1177                 goto out;
1178         }
1179
1180         device_lock(dev);
1181         nvdimm_bus_lock(dev);
1182         rc = nd_cmd_clear_to_send(nvdimm_bus, nvdimm, func, buf);
1183         if (rc)
1184                 goto out_unlock;
1185
1186         rc = nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len, &cmd_rc);
1187         if (rc < 0)
1188                 goto out_unlock;
1189
1190         if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR && cmd_rc >= 0) {
1191                 struct nd_cmd_clear_error *clear_err = buf;
1192
1193                 nvdimm_account_cleared_poison(nvdimm_bus, clear_err->address,
1194                                 clear_err->cleared);
1195         }
1196
1197         if (copy_to_user(p, buf, buf_len))
1198                 rc = -EFAULT;
1199
1200 out_unlock:
1201         nvdimm_bus_unlock(dev);
1202         device_unlock(dev);
1203 out:
1204         kfree(in_env);
1205         kfree(out_env);
1206         vfree(buf);
1207         return rc;
1208 }
1209
1210 enum nd_ioctl_mode {
1211         BUS_IOCTL,
1212         DIMM_IOCTL,
1213 };
1214
1215 static int match_dimm(struct device *dev, void *data)
1216 {
1217         long id = (long) data;
1218
1219         if (is_nvdimm(dev)) {
1220                 struct nvdimm *nvdimm = to_nvdimm(dev);
1221
1222                 return nvdimm->id == id;
1223         }
1224
1225         return 0;
1226 }
1227
1228 static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
1229                 enum nd_ioctl_mode mode)
1230
1231 {
1232         struct nvdimm_bus *nvdimm_bus, *found = NULL;
1233         long id = (long) file->private_data;
1234         struct nvdimm *nvdimm = NULL;
1235         int rc, ro;
1236
1237         ro = ((file->f_flags & O_ACCMODE) == O_RDONLY);
1238         mutex_lock(&nvdimm_bus_list_mutex);
1239         list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) {
1240                 if (mode == DIMM_IOCTL) {
1241                         struct device *dev;
1242
1243                         dev = device_find_child(&nvdimm_bus->dev,
1244                                         file->private_data, match_dimm);
1245                         if (!dev)
1246                                 continue;
1247                         nvdimm = to_nvdimm(dev);
1248                         found = nvdimm_bus;
1249                 } else if (nvdimm_bus->id == id) {
1250                         found = nvdimm_bus;
1251                 }
1252
1253                 if (found) {
1254                         atomic_inc(&nvdimm_bus->ioctl_active);
1255                         break;
1256                 }
1257         }
1258         mutex_unlock(&nvdimm_bus_list_mutex);
1259
1260         if (!found)
1261                 return -ENXIO;
1262
1263         nvdimm_bus = found;
1264         rc = __nd_ioctl(nvdimm_bus, nvdimm, ro, cmd, arg);
1265
1266         if (nvdimm)
1267                 put_device(&nvdimm->dev);
1268         if (atomic_dec_and_test(&nvdimm_bus->ioctl_active))
1269                 wake_up(&nvdimm_bus->wait);
1270
1271         return rc;
1272 }
1273
1274 static long bus_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1275 {
1276         return nd_ioctl(file, cmd, arg, BUS_IOCTL);
1277 }
1278
1279 static long dimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1280 {
1281         return nd_ioctl(file, cmd, arg, DIMM_IOCTL);
1282 }
1283
1284 static int nd_open(struct inode *inode, struct file *file)
1285 {
1286         long minor = iminor(inode);
1287
1288         file->private_data = (void *) minor;
1289         return 0;
1290 }
1291
1292 static const struct file_operations nvdimm_bus_fops = {
1293         .owner = THIS_MODULE,
1294         .open = nd_open,
1295         .unlocked_ioctl = bus_ioctl,
1296         .compat_ioctl = compat_ptr_ioctl,
1297         .llseek = noop_llseek,
1298 };
1299
1300 static const struct file_operations nvdimm_fops = {
1301         .owner = THIS_MODULE,
1302         .open = nd_open,
1303         .unlocked_ioctl = dimm_ioctl,
1304         .compat_ioctl = compat_ptr_ioctl,
1305         .llseek = noop_llseek,
1306 };
1307
1308 int __init nvdimm_bus_init(void)
1309 {
1310         int rc;
1311
1312         rc = bus_register(&nvdimm_bus_type);
1313         if (rc)
1314                 return rc;
1315
1316         rc = register_chrdev(0, "ndctl", &nvdimm_bus_fops);
1317         if (rc < 0)
1318                 goto err_bus_chrdev;
1319         nvdimm_bus_major = rc;
1320
1321         rc = register_chrdev(0, "dimmctl", &nvdimm_fops);
1322         if (rc < 0)
1323                 goto err_dimm_chrdev;
1324         nvdimm_major = rc;
1325
1326         rc = class_register(&nd_class);
1327         if (rc)
1328                 goto err_class;
1329
1330         rc = driver_register(&nd_bus_driver.drv);
1331         if (rc)
1332                 goto err_nd_bus;
1333
1334         return 0;
1335
1336  err_nd_bus:
1337         class_unregister(&nd_class);
1338  err_class:
1339         unregister_chrdev(nvdimm_major, "dimmctl");
1340  err_dimm_chrdev:
1341         unregister_chrdev(nvdimm_bus_major, "ndctl");
1342  err_bus_chrdev:
1343         bus_unregister(&nvdimm_bus_type);
1344
1345         return rc;
1346 }
1347
1348 void nvdimm_bus_exit(void)
1349 {
1350         driver_unregister(&nd_bus_driver.drv);
1351         class_unregister(&nd_class);
1352         unregister_chrdev(nvdimm_bus_major, "ndctl");
1353         unregister_chrdev(nvdimm_major, "dimmctl");
1354         bus_unregister(&nvdimm_bus_type);
1355         ida_destroy(&nd_ida);
1356 }