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_dax(dev))
  39                 return ND_DEVICE_DAX_PMEM;
  40         else if (is_nd_region(dev->parent))
  41                 return nd_region_to_nstype(to_nd_region(dev->parent));
  42
  43         return 0;
  44 }
  45
  46 static int nvdimm_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
  47 {
  48         return add_uevent_var(env, "MODALIAS=" ND_DEVICE_MODALIAS_FMT,
  49                         to_nd_device_type(dev));
  50 }
  51
  52 static struct module *to_bus_provider(struct device *dev)
  53 {
  54         /* pin bus providers while regions are enabled */
  55         if (is_nd_region(dev)) {
  56                 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
  57
  58                 return nvdimm_bus->nd_desc->module;
  59         }
  60         return NULL;
  61 }
  62
  63 static void nvdimm_bus_probe_start(struct nvdimm_bus *nvdimm_bus)
  64 {
  65         nvdimm_bus_lock(&nvdimm_bus->dev);
  66         nvdimm_bus->probe_active++;
  67         nvdimm_bus_unlock(&nvdimm_bus->dev);
  68 }
  69
  70 static void nvdimm_bus_probe_end(struct nvdimm_bus *nvdimm_bus)
  71 {
  72         nvdimm_bus_lock(&nvdimm_bus->dev);
  73         if (--nvdimm_bus->probe_active == 0)
  74                 wake_up(&nvdimm_bus->wait);
  75         nvdimm_bus_unlock(&nvdimm_bus->dev);
  76 }
  77
  78 static int nvdimm_bus_probe(struct device *dev)
  79 {
  80         struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
  81         struct module *provider = to_bus_provider(dev);
  82         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
  83         int rc;
  84
  85         if (!try_module_get(provider))
  86                 return -ENXIO;
  87
  88         dev_dbg(&nvdimm_bus->dev, "START: %s.probe(%s)\n",
  89                         dev->driver->name, dev_name(dev));
  90
  91         nvdimm_bus_probe_start(nvdimm_bus);
  92         debug_nvdimm_lock(dev);
  93         rc = nd_drv->probe(dev);
  94         debug_nvdimm_unlock(dev);
  95
  96         if ((rc == 0 || rc == -EOPNOTSUPP) &&
  97                         dev->parent && is_nd_region(dev->parent))
  98                 nd_region_advance_seeds(to_nd_region(dev->parent), dev);
  99         nvdimm_bus_probe_end(nvdimm_bus);
 100
 101         dev_dbg(&nvdimm_bus->dev, "END: %s.probe(%s) = %d\n", dev->driver->name,
 102                         dev_name(dev), rc);
 103
 104         if (rc != 0)
 105                 module_put(provider);
 106         return rc;
 107 }
 108
 109 static void nvdimm_bus_remove(struct device *dev)
 110 {
 111         struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
 112         struct module *provider = to_bus_provider(dev);
 113         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
 114
 115         if (nd_drv->remove) {
 116                 debug_nvdimm_lock(dev);
 117                 nd_drv->remove(dev);
 118                 debug_nvdimm_unlock(dev);
 119         }
 120
 121         dev_dbg(&nvdimm_bus->dev, "%s.remove(%s)\n", dev->driver->name,
 122                         dev_name(dev));
 123         module_put(provider);
 124 }
 125
 126 static void nvdimm_bus_shutdown(struct device *dev)
 127 {
 128         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
 129         struct nd_device_driver *nd_drv = NULL;
 130
 131         if (dev->driver)
 132                 nd_drv = to_nd_device_driver(dev->driver);
 133
 134         if (nd_drv && nd_drv->shutdown) {
 135                 nd_drv->shutdown(dev);
 136                 dev_dbg(&nvdimm_bus->dev, "%s.shutdown(%s)\n",
 137                                 dev->driver->name, dev_name(dev));
 138         }
 139 }
 140
 141 void nd_device_notify(struct device *dev, enum nvdimm_event event)
 142 {
 143         nd_device_lock(dev);
 144         if (dev->driver) {
 145                 struct nd_device_driver *nd_drv;
 146
 147                 nd_drv = to_nd_device_driver(dev->driver);
 148                 if (nd_drv->notify)
 149                         nd_drv->notify(dev, event);
 150         }
 151         nd_device_unlock(dev);
 152 }
 153 EXPORT_SYMBOL(nd_device_notify);
 154
 155 void nvdimm_region_notify(struct nd_region *nd_region, enum nvdimm_event event)
 156 {
 157         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
 158
 159         if (!nvdimm_bus)
 160                 return;
 161
 162         /* caller is responsible for holding a reference on the device */
 163         nd_device_notify(&nd_region->dev, event);
 164 }
 165 EXPORT_SYMBOL_GPL(nvdimm_region_notify);
 166
 167 struct clear_badblocks_context {
 168         resource_size_t phys, cleared;
 169 };
 170
 171 static int nvdimm_clear_badblocks_region(struct device *dev, void *data)
 172 {
 173         struct clear_badblocks_context *ctx = data;
 174         struct nd_region *nd_region;
 175         resource_size_t ndr_end;
 176         sector_t sector;
 177
 178         /* make sure device is a region */
 179         if (!is_memory(dev))
 180                 return 0;
 181
 182         nd_region = to_nd_region(dev);
 183         ndr_end = nd_region->ndr_start + nd_region->ndr_size - 1;
 184
 185         /* make sure we are in the region */
 186         if (ctx->phys < nd_region->ndr_start
 187                         || (ctx->phys + ctx->cleared) > ndr_end)
 188                 return 0;
 189
 190         sector = (ctx->phys - nd_region->ndr_start) / 512;
 191         badblocks_clear(&nd_region->bb, sector, ctx->cleared / 512);
 192
 193         if (nd_region->bb_state)
 194                 sysfs_notify_dirent(nd_region->bb_state);
 195
 196         return 0;
 197 }
 198
 199 static void nvdimm_clear_badblocks_regions(struct nvdimm_bus *nvdimm_bus,
 200                 phys_addr_t phys, u64 cleared)
 201 {
 202         struct clear_badblocks_context ctx = {
 203                 .phys = phys,
 204                 .cleared = cleared,
 205         };
 206
 207         device_for_each_child(&nvdimm_bus->dev, &ctx,
 208                         nvdimm_clear_badblocks_region);
 209 }
 210
 211 static void nvdimm_account_cleared_poison(struct nvdimm_bus *nvdimm_bus,
 212                 phys_addr_t phys, u64 cleared)
 213 {
 214         if (cleared > 0)
 215                 badrange_forget(&nvdimm_bus->badrange, phys, cleared);
 216
 217         if (cleared > 0 && cleared / 512)
 218                 nvdimm_clear_badblocks_regions(nvdimm_bus, phys, cleared);
 219 }
 220
 221 long nvdimm_clear_poison(struct device *dev, phys_addr_t phys,
 222                 unsigned int len)
 223 {
 224         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
 225         struct nvdimm_bus_descriptor *nd_desc;
 226         struct nd_cmd_clear_error clear_err;
 227         struct nd_cmd_ars_cap ars_cap;
 228         u32 clear_err_unit, mask;
 229         unsigned int noio_flag;
 230         int cmd_rc, rc;
 231
 232         if (!nvdimm_bus)
 233                 return -ENXIO;
 234
 235         nd_desc = nvdimm_bus->nd_desc;
 236         /*
 237          * if ndctl does not exist, it's PMEM_LEGACY and
 238          * we want to just pretend everything is handled.
 239          */
 240         if (!nd_desc->ndctl)
 241                 return len;
 242
 243         memset(&ars_cap, 0, sizeof(ars_cap));
 244         ars_cap.address = phys;
 245         ars_cap.length = len;
 246         noio_flag = memalloc_noio_save();
 247         rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, &ars_cap,
 248                         sizeof(ars_cap), &cmd_rc);
 249         memalloc_noio_restore(noio_flag);
 250         if (rc < 0)
 251                 return rc;
 252         if (cmd_rc < 0)
 253                 return cmd_rc;
 254         clear_err_unit = ars_cap.clear_err_unit;
 255         if (!clear_err_unit || !is_power_of_2(clear_err_unit))
 256                 return -ENXIO;
 257
 258         mask = clear_err_unit - 1;
 259         if ((phys | len) & mask)
 260                 return -ENXIO;
 261         memset(&clear_err, 0, sizeof(clear_err));
 262         clear_err.address = phys;
 263         clear_err.length = len;
 264         noio_flag = memalloc_noio_save();
 265         rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_CLEAR_ERROR, &clear_err,
 266                         sizeof(clear_err), &cmd_rc);
 267         memalloc_noio_restore(noio_flag);
 268         if (rc < 0)
 269                 return rc;
 270         if (cmd_rc < 0)
 271                 return cmd_rc;
 272
 273         nvdimm_account_cleared_poison(nvdimm_bus, phys, clear_err.cleared);
 274
 275         return clear_err.cleared;
 276 }
 277 EXPORT_SYMBOL_GPL(nvdimm_clear_poison);
 278
 279 static int nvdimm_bus_match(struct device *dev, struct device_driver *drv);
 280
 281 static struct bus_type nvdimm_bus_type = {
 282         .name = "nd",
 283         .uevent = nvdimm_bus_uevent,
 284         .match = nvdimm_bus_match,
 285         .probe = nvdimm_bus_probe,
 286         .remove = nvdimm_bus_remove,
 287         .shutdown = nvdimm_bus_shutdown,
 288 };
 289
 290 static void nvdimm_bus_release(struct device *dev)
 291 {
 292         struct nvdimm_bus *nvdimm_bus;
 293
 294         nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
 295         ida_simple_remove(&nd_ida, nvdimm_bus->id);
 296         kfree(nvdimm_bus);
 297 }
 298
 299 static const struct device_type nvdimm_bus_dev_type = {
 300         .release = nvdimm_bus_release,
 301         .groups = nvdimm_bus_attribute_groups,
 302 };
 303
 304 bool is_nvdimm_bus(struct device *dev)
 305 {
 306         return dev->type == &nvdimm_bus_dev_type;
 307 }
 308
 309 struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev)
 310 {
 311         struct device *dev;
 312
 313         for (dev = nd_dev; dev; dev = dev->parent)
 314                 if (is_nvdimm_bus(dev))
 315                         break;
 316         dev_WARN_ONCE(nd_dev, !dev, "invalid dev, not on nd bus\n");
 317         if (dev)
 318                 return to_nvdimm_bus(dev);
 319         return NULL;
 320 }
 321
 322 struct nvdimm_bus *to_nvdimm_bus(struct device *dev)
 323 {
 324         struct nvdimm_bus *nvdimm_bus;
 325
 326         nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
 327         WARN_ON(!is_nvdimm_bus(dev));
 328         return nvdimm_bus;
 329 }
 330 EXPORT_SYMBOL_GPL(to_nvdimm_bus);
 331
 332 struct nvdimm_bus *nvdimm_to_bus(struct nvdimm *nvdimm)
 333 {
 334         return to_nvdimm_bus(nvdimm->dev.parent);
 335 }
 336 EXPORT_SYMBOL_GPL(nvdimm_to_bus);
 337
 338 struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
 339                 struct nvdimm_bus_descriptor *nd_desc)
 340 {
 341         struct nvdimm_bus *nvdimm_bus;
 342         int rc;
 343
 344         nvdimm_bus = kzalloc(sizeof(*nvdimm_bus), GFP_KERNEL);
 345         if (!nvdimm_bus)
 346                 return NULL;
 347         INIT_LIST_HEAD(&nvdimm_bus->list);
 348         INIT_LIST_HEAD(&nvdimm_bus->mapping_list);
 349         init_waitqueue_head(&nvdimm_bus->wait);
 350         nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
 351         if (nvdimm_bus->id < 0) {
 352                 kfree(nvdimm_bus);
 353                 return NULL;
 354         }
 355         mutex_init(&nvdimm_bus->reconfig_mutex);
 356         badrange_init(&nvdimm_bus->badrange);
 357         nvdimm_bus->nd_desc = nd_desc;
 358         nvdimm_bus->dev.parent = parent;
 359         nvdimm_bus->dev.type = &nvdimm_bus_dev_type;
 360         nvdimm_bus->dev.groups = nd_desc->attr_groups;
 361         nvdimm_bus->dev.bus = &nvdimm_bus_type;
 362         nvdimm_bus->dev.of_node = nd_desc->of_node;
 363         device_initialize(&nvdimm_bus->dev);
 364         device_set_pm_not_required(&nvdimm_bus->dev);
 365         rc = dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id);
 366         if (rc)
 367                 goto err;
 368
 369         rc = device_add(&nvdimm_bus->dev);
 370         if (rc) {
 371                 dev_dbg(&nvdimm_bus->dev, "registration failed: %d\n", rc);
 372                 goto err;
 373         }
 374
 375         return nvdimm_bus;
 376  err:
 377         put_device(&nvdimm_bus->dev);
 378         return NULL;
 379 }
 380 EXPORT_SYMBOL_GPL(nvdimm_bus_register);
 381
 382 void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus)
 383 {
 384         if (!nvdimm_bus)
 385                 return;
 386         device_unregister(&nvdimm_bus->dev);
 387 }
 388 EXPORT_SYMBOL_GPL(nvdimm_bus_unregister);
 389
 390 static int child_unregister(struct device *dev, void *data)
 391 {
 392         /*
 393          * the singular ndctl class device per bus needs to be
 394          * "device_destroy"ed, so skip it here
 395          *
 396          * i.e. remove classless children
 397          */
 398         if (dev->class)
 399                 return 0;
 400
 401         if (is_nvdimm(dev))
 402                 nvdimm_delete(to_nvdimm(dev));
 403         else
 404                 nd_device_unregister(dev, ND_SYNC);
 405
 406         return 0;
 407 }
 408
 409 static void free_badrange_list(struct list_head *badrange_list)
 410 {
 411         struct badrange_entry *bre, *next;
 412
 413         list_for_each_entry_safe(bre, next, badrange_list, list) {
 414                 list_del(&bre->list);
 415                 kfree(bre);
 416         }
 417         list_del_init(badrange_list);
 418 }
 419
 420 static void nd_bus_remove(struct device *dev)
 421 {
 422         struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
 423
 424         mutex_lock(&nvdimm_bus_list_mutex);
 425         list_del_init(&nvdimm_bus->list);
 426         mutex_unlock(&nvdimm_bus_list_mutex);
 427
 428         wait_event(nvdimm_bus->wait,
 429                         atomic_read(&nvdimm_bus->ioctl_active) == 0);
 430
 431         nd_synchronize();
 432         device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister);
 433
 434         spin_lock(&nvdimm_bus->badrange.lock);
 435         free_badrange_list(&nvdimm_bus->badrange.list);
 436         spin_unlock(&nvdimm_bus->badrange.lock);
 437
 438         nvdimm_bus_destroy_ndctl(nvdimm_bus);
 439 }
 440
 441 static int nd_bus_probe(struct device *dev)
 442 {
 443         struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
 444         int rc;
 445
 446         rc = nvdimm_bus_create_ndctl(nvdimm_bus);
 447         if (rc)
 448                 return rc;
 449
 450         mutex_lock(&nvdimm_bus_list_mutex);
 451         list_add_tail(&nvdimm_bus->list, &nvdimm_bus_list);
 452         mutex_unlock(&nvdimm_bus_list_mutex);
 453
 454         /* enable bus provider attributes to look up their local context */
 455         dev_set_drvdata(dev, nvdimm_bus->nd_desc);
 456
 457         return 0;
 458 }
 459
 460 static struct nd_device_driver nd_bus_driver = {
 461         .probe = nd_bus_probe,
 462         .remove = nd_bus_remove,
 463         .drv = {
 464                 .name = "nd_bus",
 465                 .suppress_bind_attrs = true,
 466                 .bus = &nvdimm_bus_type,
 467                 .owner = THIS_MODULE,
 468                 .mod_name = KBUILD_MODNAME,
 469         },
 470 };
 471
 472 static int nvdimm_bus_match(struct device *dev, struct device_driver *drv)
 473 {
 474         struct nd_device_driver *nd_drv = to_nd_device_driver(drv);
 475
 476         if (is_nvdimm_bus(dev) && nd_drv == &nd_bus_driver)
 477                 return true;
 478
 479         return !!test_bit(to_nd_device_type(dev), &nd_drv->type);
 480 }
 481
 482 static ASYNC_DOMAIN_EXCLUSIVE(nd_async_domain);
 483
 484 void nd_synchronize(void)
 485 {
 486         async_synchronize_full_domain(&nd_async_domain);
 487 }
 488 EXPORT_SYMBOL_GPL(nd_synchronize);
 489
 490 static void nd_async_device_register(void *d, async_cookie_t cookie)
 491 {
 492         struct device *dev = d;
 493
 494         if (device_add(dev) != 0) {
 495                 dev_err(dev, "%s: failed\n", __func__);
 496                 put_device(dev);
 497         }
 498         put_device(dev);
 499         if (dev->parent)
 500                 put_device(dev->parent);
 501 }
 502
 503 static void nd_async_device_unregister(void *d, async_cookie_t cookie)
 504 {
 505         struct device *dev = d;
 506
 507         /* flush bus operations before delete */
 508         nvdimm_bus_lock(dev);
 509         nvdimm_bus_unlock(dev);
 510
 511         device_unregister(dev);
 512         put_device(dev);
 513 }
 514
 515 void __nd_device_register(struct device *dev)
 516 {
 517         if (!dev)
 518                 return;
 519
 520         /*
 521          * Ensure that region devices always have their NUMA node set as
 522          * early as possible. This way we are able to make certain that
 523          * any memory associated with the creation and the creation
 524          * itself of the region is associated with the correct node.
 525          */
 526         if (is_nd_region(dev))
 527                 set_dev_node(dev, to_nd_region(dev)->numa_node);
 528
 529         dev->bus = &nvdimm_bus_type;
 530         device_set_pm_not_required(dev);
 531         if (dev->parent) {
 532                 get_device(dev->parent);
 533                 if (dev_to_node(dev) == NUMA_NO_NODE)
 534                         set_dev_node(dev, dev_to_node(dev->parent));
 535         }
 536         get_device(dev);
 537
 538         async_schedule_dev_domain(nd_async_device_register, dev,
 539                                   &nd_async_domain);
 540 }
 541
 542 void nd_device_register(struct device *dev)
 543 {
 544         device_initialize(dev);
 545         __nd_device_register(dev);
 546 }
 547 EXPORT_SYMBOL(nd_device_register);
 548
 549 void nd_device_unregister(struct device *dev, enum nd_async_mode mode)
 550 {
 551         bool killed;
 552
 553         switch (mode) {
 554         case ND_ASYNC:
 555                 /*
 556                  * In the async case this is being triggered with the
 557                  * device lock held and the unregistration work needs to
 558                  * be moved out of line iff this is thread has won the
 559                  * race to schedule the deletion.
 560                  */
 561                 if (!kill_device(dev))
 562                         return;
 563
 564                 get_device(dev);
 565                 async_schedule_domain(nd_async_device_unregister, dev,
 566                                 &nd_async_domain);
 567                 break;
 568         case ND_SYNC:
 569                 /*
 570                  * In the sync case the device is being unregistered due
 571                  * to a state change of the parent. Claim the kill state
 572                  * to synchronize against other unregistration requests,
 573                  * or otherwise let the async path handle it if the
 574                  * unregistration was already queued.
 575                  */
 576                 nd_device_lock(dev);
 577                 killed = kill_device(dev);
 578                 nd_device_unlock(dev);
 579
 580                 if (!killed)
 581                         return;
 582
 583                 nd_synchronize();
 584                 device_unregister(dev);
 585                 break;
 586         }
 587 }
 588 EXPORT_SYMBOL(nd_device_unregister);
 589
 590 /**
 591  * __nd_driver_register() - register a region or a namespace driver
 592  * @nd_drv: driver to register
 593  * @owner: automatically set by nd_driver_register() macro
 594  * @mod_name: automatically set by nd_driver_register() macro
 595  */
 596 int __nd_driver_register(struct nd_device_driver *nd_drv, struct module *owner,
 597                 const char *mod_name)
 598 {
 599         struct device_driver *drv = &nd_drv->drv;
 600
 601         if (!nd_drv->type) {
 602                 pr_debug("driver type bitmask not set (%ps)\n",
 603                                 __builtin_return_address(0));
 604                 return -EINVAL;
 605         }
 606
 607         if (!nd_drv->probe) {
 608                 pr_debug("%s ->probe() must be specified\n", mod_name);
 609                 return -EINVAL;
 610         }
 611
 612         drv->bus = &nvdimm_bus_type;
 613         drv->owner = owner;
 614         drv->mod_name = mod_name;
 615
 616         return driver_register(drv);
 617 }
 618 EXPORT_SYMBOL(__nd_driver_register);
 619
 620 void nvdimm_check_and_set_ro(struct gendisk *disk)
 621 {
 622         struct device *dev = disk_to_dev(disk)->parent;
 623         struct nd_region *nd_region = to_nd_region(dev->parent);
 624         int disk_ro = get_disk_ro(disk);
 625
 626         /* catch the disk up with the region ro state */
 627         if (disk_ro == nd_region->ro)
 628                 return;
 629
 630         dev_info(dev, "%s read-%s, marking %s read-%s\n",
 631                  dev_name(&nd_region->dev), nd_region->ro ? "only" : "write",
 632                  disk->disk_name, nd_region->ro ? "only" : "write");
 633         set_disk_ro(disk, nd_region->ro);
 634 }
 635 EXPORT_SYMBOL(nvdimm_check_and_set_ro);
 636
 637 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
 638                 char *buf)
 639 {
 640         return sprintf(buf, ND_DEVICE_MODALIAS_FMT "\n",
 641                         to_nd_device_type(dev));
 642 }
 643 static DEVICE_ATTR_RO(modalias);
 644
 645 static ssize_t devtype_show(struct device *dev, struct device_attribute *attr,
 646                 char *buf)
 647 {
 648         return sprintf(buf, "%s\n", dev->type->name);
 649 }
 650 static DEVICE_ATTR_RO(devtype);
 651
 652 static struct attribute *nd_device_attributes[] = {
 653         &dev_attr_modalias.attr,
 654         &dev_attr_devtype.attr,
 655         NULL,
 656 };
 657
 658 /*
 659  * nd_device_attribute_group - generic attributes for all devices on an nd bus
 660  */
 661 const struct attribute_group nd_device_attribute_group = {
 662         .attrs = nd_device_attributes,
 663 };
 664
 665 static ssize_t numa_node_show(struct device *dev,
 666                 struct device_attribute *attr, char *buf)
 667 {
 668         return sprintf(buf, "%d\n", dev_to_node(dev));
 669 }
 670 static DEVICE_ATTR_RO(numa_node);
 671
 672 static int nvdimm_dev_to_target_node(struct device *dev)
 673 {
 674         struct device *parent = dev->parent;
 675         struct nd_region *nd_region = NULL;
 676
 677         if (is_nd_region(dev))
 678                 nd_region = to_nd_region(dev);
 679         else if (parent && is_nd_region(parent))
 680                 nd_region = to_nd_region(parent);
 681
 682         if (!nd_region)
 683                 return NUMA_NO_NODE;
 684         return nd_region->target_node;
 685 }
 686
 687 static ssize_t target_node_show(struct device *dev,
 688                 struct device_attribute *attr, char *buf)
 689 {
 690         return sprintf(buf, "%d\n", nvdimm_dev_to_target_node(dev));
 691 }
 692 static DEVICE_ATTR_RO(target_node);
 693
 694 static struct attribute *nd_numa_attributes[] = {
 695         &dev_attr_numa_node.attr,
 696         &dev_attr_target_node.attr,
 697         NULL,
 698 };
 699
 700 static umode_t nd_numa_attr_visible(struct kobject *kobj, struct attribute *a,
 701                 int n)
 702 {
 703         struct device *dev = container_of(kobj, typeof(*dev), kobj);
 704
 705         if (!IS_ENABLED(CONFIG_NUMA))
 706                 return 0;
 707
 708         if (a == &dev_attr_target_node.attr &&
 709                         nvdimm_dev_to_target_node(dev) == NUMA_NO_NODE)
 710                 return 0;
 711
 712         return a->mode;
 713 }
 714
 715 /*
 716  * nd_numa_attribute_group - NUMA attributes for all devices on an nd bus
 717  */
 718 const struct attribute_group nd_numa_attribute_group = {
 719         .attrs = nd_numa_attributes,
 720         .is_visible = nd_numa_attr_visible,
 721 };
 722
 723 static void ndctl_release(struct device *dev)
 724 {
 725         kfree(dev);
 726 }
 727
 728 int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus)
 729 {
 730         dev_t devt = MKDEV(nvdimm_bus_major, nvdimm_bus->id);
 731         struct device *dev;
 732         int rc;
 733
 734         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 735         if (!dev)
 736                 return -ENOMEM;
 737         device_initialize(dev);
 738         device_set_pm_not_required(dev);
 739         dev->class = nd_class;
 740         dev->parent = &nvdimm_bus->dev;
 741         dev->devt = devt;
 742         dev->release = ndctl_release;
 743         rc = dev_set_name(dev, "ndctl%d", nvdimm_bus->id);
 744         if (rc)
 745                 goto err;
 746
 747         rc = device_add(dev);
 748         if (rc) {
 749                 dev_dbg(&nvdimm_bus->dev, "failed to register ndctl%d: %d\n",
 750                                 nvdimm_bus->id, rc);
 751                 goto err;
 752         }
 753         return 0;
 754
 755 err:
 756         put_device(dev);
 757         return rc;
 758 }
 759
 760 void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus)
 761 {
 762         device_destroy(nd_class, MKDEV(nvdimm_bus_major, nvdimm_bus->id));
 763 }
 764
 765 static const struct nd_cmd_desc __nd_cmd_dimm_descs[] = {
 766         [ND_CMD_IMPLEMENTED] = { },
 767         [ND_CMD_SMART] = {
 768                 .out_num = 2,
 769                 .out_sizes = { 4, 128, },
 770         },
 771         [ND_CMD_SMART_THRESHOLD] = {
 772                 .out_num = 2,
 773                 .out_sizes = { 4, 8, },
 774         },
 775         [ND_CMD_DIMM_FLAGS] = {
 776                 .out_num = 2,
 777                 .out_sizes = { 4, 4 },
 778         },
 779         [ND_CMD_GET_CONFIG_SIZE] = {
 780                 .out_num = 3,
 781                 .out_sizes = { 4, 4, 4, },
 782         },
 783         [ND_CMD_GET_CONFIG_DATA] = {
 784                 .in_num = 2,
 785                 .in_sizes = { 4, 4, },
 786                 .out_num = 2,
 787                 .out_sizes = { 4, UINT_MAX, },
 788         },
 789         [ND_CMD_SET_CONFIG_DATA] = {
 790                 .in_num = 3,
 791                 .in_sizes = { 4, 4, UINT_MAX, },
 792                 .out_num = 1,
 793                 .out_sizes = { 4, },
 794         },
 795         [ND_CMD_VENDOR] = {
 796                 .in_num = 3,
 797                 .in_sizes = { 4, 4, UINT_MAX, },
 798                 .out_num = 3,
 799                 .out_sizes = { 4, 4, UINT_MAX, },
 800         },
 801         [ND_CMD_CALL] = {
 802                 .in_num = 2,
 803                 .in_sizes = { sizeof(struct nd_cmd_pkg), UINT_MAX, },
 804                 .out_num = 1,
 805                 .out_sizes = { UINT_MAX, },
 806         },
 807 };
 808
 809 const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd)
 810 {
 811         if (cmd < ARRAY_SIZE(__nd_cmd_dimm_descs))
 812                 return &__nd_cmd_dimm_descs[cmd];
 813         return NULL;
 814 }
 815 EXPORT_SYMBOL_GPL(nd_cmd_dimm_desc);
 816
 817 static const struct nd_cmd_desc __nd_cmd_bus_descs[] = {
 818         [ND_CMD_IMPLEMENTED] = { },
 819         [ND_CMD_ARS_CAP] = {
 820                 .in_num = 2,
 821                 .in_sizes = { 8, 8, },
 822                 .out_num = 4,
 823                 .out_sizes = { 4, 4, 4, 4, },
 824         },
 825         [ND_CMD_ARS_START] = {
 826                 .in_num = 5,
 827                 .in_sizes = { 8, 8, 2, 1, 5, },
 828                 .out_num = 2,
 829                 .out_sizes = { 4, 4, },
 830         },
 831         [ND_CMD_ARS_STATUS] = {
 832                 .out_num = 3,
 833                 .out_sizes = { 4, 4, UINT_MAX, },
 834         },
 835         [ND_CMD_CLEAR_ERROR] = {
 836                 .in_num = 2,
 837                 .in_sizes = { 8, 8, },
 838                 .out_num = 3,
 839                 .out_sizes = { 4, 4, 8, },
 840         },
 841         [ND_CMD_CALL] = {
 842                 .in_num = 2,
 843                 .in_sizes = { sizeof(struct nd_cmd_pkg), UINT_MAX, },
 844                 .out_num = 1,
 845                 .out_sizes = { UINT_MAX, },
 846         },
 847 };
 848
 849 const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd)
 850 {
 851         if (cmd < ARRAY_SIZE(__nd_cmd_bus_descs))
 852                 return &__nd_cmd_bus_descs[cmd];
 853         return NULL;
 854 }
 855 EXPORT_SYMBOL_GPL(nd_cmd_bus_desc);
 856
 857 u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
 858                 const struct nd_cmd_desc *desc, int idx, void *buf)
 859 {
 860         if (idx >= desc->in_num)
 861                 return UINT_MAX;
 862
 863         if (desc->in_sizes[idx] < UINT_MAX)
 864                 return desc->in_sizes[idx];
 865
 866         if (nvdimm && cmd == ND_CMD_SET_CONFIG_DATA && idx == 2) {
 867                 struct nd_cmd_set_config_hdr *hdr = buf;
 868
 869                 return hdr->in_length;
 870         } else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) {
 871                 struct nd_cmd_vendor_hdr *hdr = buf;
 872
 873                 return hdr->in_length;
 874         } else if (cmd == ND_CMD_CALL) {
 875                 struct nd_cmd_pkg *pkg = buf;
 876
 877                 return pkg->nd_size_in;
 878         }
 879
 880         return UINT_MAX;
 881 }
 882 EXPORT_SYMBOL_GPL(nd_cmd_in_size);
 883
 884 u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
 885                 const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
 886                 const u32 *out_field, unsigned long remainder)
 887 {
 888         if (idx >= desc->out_num)
 889                 return UINT_MAX;
 890
 891         if (desc->out_sizes[idx] < UINT_MAX)
 892                 return desc->out_sizes[idx];
 893
 894         if (nvdimm && cmd == ND_CMD_GET_CONFIG_DATA && idx == 1)
 895                 return in_field[1];
 896         else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2)
 897                 return out_field[1];
 898         else if (!nvdimm && cmd == ND_CMD_ARS_STATUS && idx == 2) {
 899                 /*
 900                  * Per table 9-276 ARS Data in ACPI 6.1, out_field[1] is
 901                  * "Size of Output Buffer in bytes, including this
 902                  * field."
 903                  */
 904                 if (out_field[1] < 4)
 905                         return 0;
 906                 /*
 907                  * ACPI 6.1 is ambiguous if 'status' is included in the
 908                  * output size. If we encounter an output size that
 909                  * overshoots the remainder by 4 bytes, assume it was
 910                  * including 'status'.
 911                  */
 912                 if (out_field[1] - 4 == remainder)
 913                         return remainder;
 914                 return out_field[1] - 8;
 915         } else if (cmd == ND_CMD_CALL) {
 916                 struct nd_cmd_pkg *pkg = (struct nd_cmd_pkg *) in_field;
 917
 918                 return pkg->nd_size_out;
 919         }
 920
 921
 922         return UINT_MAX;
 923 }
 924 EXPORT_SYMBOL_GPL(nd_cmd_out_size);
 925
 926 void wait_nvdimm_bus_probe_idle(struct device *dev)
 927 {
 928         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
 929
 930         do {
 931                 if (nvdimm_bus->probe_active == 0)
 932                         break;
 933                 nvdimm_bus_unlock(dev);
 934                 nd_device_unlock(dev);
 935                 wait_event(nvdimm_bus->wait,
 936                                 nvdimm_bus->probe_active == 0);
 937                 nd_device_lock(dev);
 938                 nvdimm_bus_lock(dev);
 939         } while (true);
 940 }
 941
 942 static int nd_pmem_forget_poison_check(struct device *dev, void *data)
 943 {
 944         struct nd_cmd_clear_error *clear_err =
 945                 (struct nd_cmd_clear_error *)data;
 946         struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL;
 947         struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL;
 948         struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL;
 949         struct nd_namespace_common *ndns = NULL;
 950         struct nd_namespace_io *nsio;
 951         resource_size_t offset = 0, end_trunc = 0, start, end, pstart, pend;
 952
 953         if (nd_dax || !dev->driver)
 954                 return 0;
 955
 956         start = clear_err->address;
 957         end = clear_err->address + clear_err->cleared - 1;
 958
 959         if (nd_btt || nd_pfn || nd_dax) {
 960                 if (nd_btt)
 961                         ndns = nd_btt->ndns;
 962                 else if (nd_pfn)
 963                         ndns = nd_pfn->ndns;
 964                 else if (nd_dax)
 965                         ndns = nd_dax->nd_pfn.ndns;
 966
 967                 if (!ndns)
 968                         return 0;
 969         } else
 970                 ndns = to_ndns(dev);
 971
 972         nsio = to_nd_namespace_io(&ndns->dev);
 973         pstart = nsio->res.start + offset;
 974         pend = nsio->res.end - end_trunc;
 975
 976         if ((pstart >= start) && (pend <= end))
 977                 return -EBUSY;
 978
 979         return 0;
 980
 981 }
 982
 983 static int nd_ns_forget_poison_check(struct device *dev, void *data)
 984 {
 985         return device_for_each_child(dev, data, nd_pmem_forget_poison_check);
 986 }
 987
 988 /* set_config requires an idle interleave set */
 989 static int nd_cmd_clear_to_send(struct nvdimm_bus *nvdimm_bus,
 990                 struct nvdimm *nvdimm, unsigned int cmd, void *data)
 991 {
 992         struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
 993
 994         /* ask the bus provider if it would like to block this request */
 995         if (nd_desc->clear_to_send) {
 996                 int rc = nd_desc->clear_to_send(nd_desc, nvdimm, cmd, data);
 997
 998                 if (rc)
 999                         return rc;
1000         }
1001
1002         /* require clear error to go through the pmem driver */
1003         if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR)
1004                 return device_for_each_child(&nvdimm_bus->dev, data,
1005                                 nd_ns_forget_poison_check);
1006
1007         if (!nvdimm || cmd != ND_CMD_SET_CONFIG_DATA)
1008                 return 0;
1009
1010         /* prevent label manipulation while the kernel owns label updates */
1011         wait_nvdimm_bus_probe_idle(&nvdimm_bus->dev);
1012         if (atomic_read(&nvdimm->busy))
1013                 return -EBUSY;
1014         return 0;
1015 }
1016
1017 static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
1018                 int read_only, unsigned int ioctl_cmd, unsigned long arg)
1019 {
1020         struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
1021         const struct nd_cmd_desc *desc = NULL;
1022         unsigned int cmd = _IOC_NR(ioctl_cmd);
1023         struct device *dev = &nvdimm_bus->dev;
1024         void __user *p = (void __user *) arg;
1025         char *out_env = NULL, *in_env = NULL;
1026         const char *cmd_name, *dimm_name;
1027         u32 in_len = 0, out_len = 0;
1028         unsigned int func = cmd;
1029         unsigned long cmd_mask;
1030         struct nd_cmd_pkg pkg;
1031         int rc, i, cmd_rc;
1032         void *buf = NULL;
1033         u64 buf_len = 0;
1034
1035         if (nvdimm) {
1036                 desc = nd_cmd_dimm_desc(cmd);
1037                 cmd_name = nvdimm_cmd_name(cmd);
1038                 cmd_mask = nvdimm->cmd_mask;
1039                 dimm_name = dev_name(&nvdimm->dev);
1040         } else {
1041                 desc = nd_cmd_bus_desc(cmd);
1042                 cmd_name = nvdimm_bus_cmd_name(cmd);
1043                 cmd_mask = nd_desc->cmd_mask;
1044                 dimm_name = "bus";
1045         }
1046
1047         /* Validate command family support against bus declared support */
1048         if (cmd == ND_CMD_CALL) {
1049                 unsigned long *mask;
1050
1051                 if (copy_from_user(&pkg, p, sizeof(pkg)))
1052                         return -EFAULT;
1053
1054                 if (nvdimm) {
1055                         if (pkg.nd_family > NVDIMM_FAMILY_MAX)
1056                                 return -EINVAL;
1057                         mask = &nd_desc->dimm_family_mask;
1058                 } else {
1059                         if (pkg.nd_family > NVDIMM_BUS_FAMILY_MAX)
1060                                 return -EINVAL;
1061                         mask = &nd_desc->bus_family_mask;
1062                 }
1063
1064                 if (!test_bit(pkg.nd_family, mask))
1065                         return -EINVAL;
1066         }
1067
1068         if (!desc ||
1069             (desc->out_num + desc->in_num == 0) ||
1070             cmd > ND_CMD_CALL ||
1071             !test_bit(cmd, &cmd_mask))
1072                 return -ENOTTY;
1073
1074         /* fail write commands (when read-only) */
1075         if (read_only)
1076                 switch (cmd) {
1077                 case ND_CMD_VENDOR:
1078                 case ND_CMD_SET_CONFIG_DATA:
1079                 case ND_CMD_ARS_START:
1080                 case ND_CMD_CLEAR_ERROR:
1081                 case ND_CMD_CALL:
1082                         dev_dbg(dev, "'%s' command while read-only.\n",
1083                                         nvdimm ? nvdimm_cmd_name(cmd)
1084                                         : nvdimm_bus_cmd_name(cmd));
1085                         return -EPERM;
1086                 default:
1087                         break;
1088                 }
1089
1090         /* process an input envelope */
1091         in_env = kzalloc(ND_CMD_MAX_ENVELOPE, GFP_KERNEL);
1092         if (!in_env)
1093                 return -ENOMEM;
1094         for (i = 0; i < desc->in_num; i++) {
1095                 u32 in_size, copy;
1096
1097                 in_size = nd_cmd_in_size(nvdimm, cmd, desc, i, in_env);
1098                 if (in_size == UINT_MAX) {
1099                         dev_err(dev, "%s:%s unknown input size cmd: %s field: %d\n",
1100                                         __func__, dimm_name, cmd_name, i);
1101                         rc = -ENXIO;
1102                         goto out;
1103                 }
1104                 if (in_len < ND_CMD_MAX_ENVELOPE)
1105                         copy = min_t(u32, ND_CMD_MAX_ENVELOPE - in_len, in_size);
1106                 else
1107                         copy = 0;
1108                 if (copy && copy_from_user(&in_env[in_len], p + in_len, copy)) {
1109                         rc = -EFAULT;
1110                         goto out;
1111                 }
1112                 in_len += in_size;
1113         }
1114
1115         if (cmd == ND_CMD_CALL) {
1116                 func = pkg.nd_command;
1117                 dev_dbg(dev, "%s, idx: %llu, in: %u, out: %u, len %llu\n",
1118                                 dimm_name, pkg.nd_command,
1119                                 in_len, out_len, buf_len);
1120         }
1121
1122         /* process an output envelope */
1123         out_env = kzalloc(ND_CMD_MAX_ENVELOPE, GFP_KERNEL);
1124         if (!out_env) {
1125                 rc = -ENOMEM;
1126                 goto out;
1127         }
1128
1129         for (i = 0; i < desc->out_num; i++) {
1130                 u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i,
1131                                 (u32 *) in_env, (u32 *) out_env, 0);
1132                 u32 copy;
1133
1134                 if (out_size == UINT_MAX) {
1135                         dev_dbg(dev, "%s unknown output size cmd: %s field: %d\n",
1136                                         dimm_name, cmd_name, i);
1137                         rc = -EFAULT;
1138                         goto out;
1139                 }
1140                 if (out_len < ND_CMD_MAX_ENVELOPE)
1141                         copy = min_t(u32, ND_CMD_MAX_ENVELOPE - out_len, out_size);
1142                 else
1143                         copy = 0;
1144                 if (copy && copy_from_user(&out_env[out_len],
1145                                         p + in_len + out_len, copy)) {
1146                         rc = -EFAULT;
1147                         goto out;
1148                 }
1149                 out_len += out_size;
1150         }
1151
1152         buf_len = (u64) out_len + (u64) in_len;
1153         if (buf_len > ND_IOCTL_MAX_BUFLEN) {
1154                 dev_dbg(dev, "%s cmd: %s buf_len: %llu > %d\n", dimm_name,
1155                                 cmd_name, buf_len, ND_IOCTL_MAX_BUFLEN);
1156                 rc = -EINVAL;
1157                 goto out;
1158         }
1159
1160         buf = vmalloc(buf_len);
1161         if (!buf) {
1162                 rc = -ENOMEM;
1163                 goto out;
1164         }
1165
1166         if (copy_from_user(buf, p, buf_len)) {
1167                 rc = -EFAULT;
1168                 goto out;
1169         }
1170
1171         nd_device_lock(dev);
1172         nvdimm_bus_lock(dev);
1173         rc = nd_cmd_clear_to_send(nvdimm_bus, nvdimm, func, buf);
1174         if (rc)
1175                 goto out_unlock;
1176
1177         rc = nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len, &cmd_rc);
1178         if (rc < 0)
1179                 goto out_unlock;
1180
1181         if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR && cmd_rc >= 0) {
1182                 struct nd_cmd_clear_error *clear_err = buf;
1183
1184                 nvdimm_account_cleared_poison(nvdimm_bus, clear_err->address,
1185                                 clear_err->cleared);
1186         }
1187
1188         if (copy_to_user(p, buf, buf_len))
1189                 rc = -EFAULT;
1190
1191 out_unlock:
1192         nvdimm_bus_unlock(dev);
1193         nd_device_unlock(dev);
1194 out:
1195         kfree(in_env);
1196         kfree(out_env);
1197         vfree(buf);
1198         return rc;
1199 }
1200
1201 enum nd_ioctl_mode {
1202         BUS_IOCTL,
1203         DIMM_IOCTL,
1204 };
1205
1206 static int match_dimm(struct device *dev, void *data)
1207 {
1208         long id = (long) data;
1209
1210         if (is_nvdimm(dev)) {
1211                 struct nvdimm *nvdimm = to_nvdimm(dev);
1212
1213                 return nvdimm->id == id;
1214         }
1215
1216         return 0;
1217 }
1218
1219 static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
1220                 enum nd_ioctl_mode mode)
1221
1222 {
1223         struct nvdimm_bus *nvdimm_bus, *found = NULL;
1224         long id = (long) file->private_data;
1225         struct nvdimm *nvdimm = NULL;
1226         int rc, ro;
1227
1228         ro = ((file->f_flags & O_ACCMODE) == O_RDONLY);
1229         mutex_lock(&nvdimm_bus_list_mutex);
1230         list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) {
1231                 if (mode == DIMM_IOCTL) {
1232                         struct device *dev;
1233
1234                         dev = device_find_child(&nvdimm_bus->dev,
1235                                         file->private_data, match_dimm);
1236                         if (!dev)
1237                                 continue;
1238                         nvdimm = to_nvdimm(dev);
1239                         found = nvdimm_bus;
1240                 } else if (nvdimm_bus->id == id) {
1241                         found = nvdimm_bus;
1242                 }
1243
1244                 if (found) {
1245                         atomic_inc(&nvdimm_bus->ioctl_active);
1246                         break;
1247                 }
1248         }
1249         mutex_unlock(&nvdimm_bus_list_mutex);
1250
1251         if (!found)
1252                 return -ENXIO;
1253
1254         nvdimm_bus = found;
1255         rc = __nd_ioctl(nvdimm_bus, nvdimm, ro, cmd, arg);
1256
1257         if (nvdimm)
1258                 put_device(&nvdimm->dev);
1259         if (atomic_dec_and_test(&nvdimm_bus->ioctl_active))
1260                 wake_up(&nvdimm_bus->wait);
1261
1262         return rc;
1263 }
1264
1265 static long bus_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1266 {
1267         return nd_ioctl(file, cmd, arg, BUS_IOCTL);
1268 }
1269
1270 static long dimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1271 {
1272         return nd_ioctl(file, cmd, arg, DIMM_IOCTL);
1273 }
1274
1275 static int nd_open(struct inode *inode, struct file *file)
1276 {
1277         long minor = iminor(inode);
1278
1279         file->private_data = (void *) minor;
1280         return 0;
1281 }
1282
1283 static const struct file_operations nvdimm_bus_fops = {
1284         .owner = THIS_MODULE,
1285         .open = nd_open,
1286         .unlocked_ioctl = bus_ioctl,
1287         .compat_ioctl = compat_ptr_ioctl,
1288         .llseek = noop_llseek,
1289 };
1290
1291 static const struct file_operations nvdimm_fops = {
1292         .owner = THIS_MODULE,
1293         .open = nd_open,
1294         .unlocked_ioctl = dimm_ioctl,
1295         .compat_ioctl = compat_ptr_ioctl,
1296         .llseek = noop_llseek,
1297 };
1298
1299 int __init nvdimm_bus_init(void)
1300 {
1301         int rc;
1302
1303         rc = bus_register(&nvdimm_bus_type);
1304         if (rc)
1305                 return rc;
1306
1307         rc = register_chrdev(0, "ndctl", &nvdimm_bus_fops);
1308         if (rc < 0)
1309                 goto err_bus_chrdev;
1310         nvdimm_bus_major = rc;
1311
1312         rc = register_chrdev(0, "dimmctl", &nvdimm_fops);
1313         if (rc < 0)
1314                 goto err_dimm_chrdev;
1315         nvdimm_major = rc;
1316
1317         nd_class = class_create(THIS_MODULE, "nd");
1318         if (IS_ERR(nd_class)) {
1319                 rc = PTR_ERR(nd_class);
1320                 goto err_class;
1321         }
1322
1323         rc = driver_register(&nd_bus_driver.drv);
1324         if (rc)
1325                 goto err_nd_bus;
1326
1327         return 0;
1328
1329  err_nd_bus:
1330         class_destroy(nd_class);
1331  err_class:
1332         unregister_chrdev(nvdimm_major, "dimmctl");
1333  err_dimm_chrdev:
1334         unregister_chrdev(nvdimm_bus_major, "ndctl");
1335  err_bus_chrdev:
1336         bus_unregister(&nvdimm_bus_type);
1337
1338         return rc;
1339 }
1340
1341 void nvdimm_bus_exit(void)
1342 {
1343         driver_unregister(&nd_bus_driver.drv);
1344         class_destroy(nd_class);
1345         unregister_chrdev(nvdimm_bus_major, "ndctl");
1346         unregister_chrdev(nvdimm_major, "dimmctl");
1347         bus_unregister(&nvdimm_bus_type);
1348         ida_destroy(&nd_ida);
1349 }