drivers/nvdimm/dimm_devs.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/moduleparam.h>
   7 #include <linux/vmalloc.h>
   8 #include <linux/device.h>
   9 #include <linux/ndctl.h>
  10 #include <linux/slab.h>
  11 #include <linux/io.h>
  12 #include <linux/fs.h>
  13 #include <linux/mm.h>
  14 #include "nd-core.h"
  15 #include "label.h"
  16 #include "pmem.h"
  17 #include "nd.h"
  18
  19 static DEFINE_IDA(dimm_ida);
  20
  21 static bool noblk;
  22 module_param(noblk, bool, 0444);
  23 MODULE_PARM_DESC(noblk, "force disable BLK / local alias support");
  24
  25 /*
  26  * Retrieve bus and dimm handle and return if this bus supports
  27  * get_config_data commands
  28  */
  29 int nvdimm_check_config_data(struct device *dev)
  30 {
  31         struct nvdimm *nvdimm = to_nvdimm(dev);
  32
  33         if (!nvdimm->cmd_mask ||
  34             !test_bit(ND_CMD_GET_CONFIG_DATA, &nvdimm->cmd_mask)) {
  35                 if (test_bit(NDD_LABELING, &nvdimm->flags))
  36                         return -ENXIO;
  37                 else
  38                         return -ENOTTY;
  39         }
  40
  41         return 0;
  42 }
  43
  44 static int validate_dimm(struct nvdimm_drvdata *ndd)
  45 {
  46         int rc;
  47
  48         if (!ndd)
  49                 return -EINVAL;
  50
  51         rc = nvdimm_check_config_data(ndd->dev);
  52         if (rc)
  53                 dev_dbg(ndd->dev, "%ps: %s error: %d\n",
  54                                 __builtin_return_address(0), __func__, rc);
  55         return rc;
  56 }
  57
  58 /**
  59  * nvdimm_init_nsarea - determine the geometry of a dimm's namespace area
  60  * @nvdimm: dimm to initialize
  61  */
  62 int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd)
  63 {
  64         struct nd_cmd_get_config_size *cmd = &ndd->nsarea;
  65         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
  66         struct nvdimm_bus_descriptor *nd_desc;
  67         int rc = validate_dimm(ndd);
  68         int cmd_rc = 0;
  69
  70         if (rc)
  71                 return rc;
  72
  73         if (cmd->config_size)
  74                 return 0; /* already valid */
  75
  76         memset(cmd, 0, sizeof(*cmd));
  77         nd_desc = nvdimm_bus->nd_desc;
  78         rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
  79                         ND_CMD_GET_CONFIG_SIZE, cmd, sizeof(*cmd), &cmd_rc);
  80         if (rc < 0)
  81                 return rc;
  82         return cmd_rc;
  83 }
  84
  85 int nvdimm_get_config_data(struct nvdimm_drvdata *ndd, void *buf,
  86                            size_t offset, size_t len)
  87 {
  88         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
  89         struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
  90         int rc = validate_dimm(ndd), cmd_rc = 0;
  91         struct nd_cmd_get_config_data_hdr *cmd;
  92         size_t max_cmd_size, buf_offset;
  93
  94         if (rc)
  95                 return rc;
  96
  97         if (offset + len > ndd->nsarea.config_size)
  98                 return -ENXIO;
  99
 100         max_cmd_size = min_t(u32, len, ndd->nsarea.max_xfer);
 101         cmd = kvzalloc(max_cmd_size + sizeof(*cmd), GFP_KERNEL);
 102         if (!cmd)
 103                 return -ENOMEM;
 104
 105         for (buf_offset = 0; len;
 106              len -= cmd->in_length, buf_offset += cmd->in_length) {
 107                 size_t cmd_size;
 108
 109                 cmd->in_offset = offset + buf_offset;
 110                 cmd->in_length = min(max_cmd_size, len);
 111
 112                 cmd_size = sizeof(*cmd) + cmd->in_length;
 113
 114                 rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
 115                                 ND_CMD_GET_CONFIG_DATA, cmd, cmd_size, &cmd_rc);
 116                 if (rc < 0)
 117                         break;
 118                 if (cmd_rc < 0) {
 119                         rc = cmd_rc;
 120                         break;
 121                 }
 122
 123                 /* out_buf should be valid, copy it into our output buffer */
 124                 memcpy(buf + buf_offset, cmd->out_buf, cmd->in_length);
 125         }
 126         kvfree(cmd);
 127
 128         return rc;
 129 }
 130
 131 int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
 132                 void *buf, size_t len)
 133 {
 134         size_t max_cmd_size, buf_offset;
 135         struct nd_cmd_set_config_hdr *cmd;
 136         int rc = validate_dimm(ndd), cmd_rc = 0;
 137         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
 138         struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
 139
 140         if (rc)
 141                 return rc;
 142
 143         if (offset + len > ndd->nsarea.config_size)
 144                 return -ENXIO;
 145
 146         max_cmd_size = min_t(u32, len, ndd->nsarea.max_xfer);
 147         cmd = kvzalloc(max_cmd_size + sizeof(*cmd) + sizeof(u32), GFP_KERNEL);
 148         if (!cmd)
 149                 return -ENOMEM;
 150
 151         for (buf_offset = 0; len; len -= cmd->in_length,
 152                         buf_offset += cmd->in_length) {
 153                 size_t cmd_size;
 154
 155                 cmd->in_offset = offset + buf_offset;
 156                 cmd->in_length = min(max_cmd_size, len);
 157                 memcpy(cmd->in_buf, buf + buf_offset, cmd->in_length);
 158
 159                 /* status is output in the last 4-bytes of the command buffer */
 160                 cmd_size = sizeof(*cmd) + cmd->in_length + sizeof(u32);
 161
 162                 rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
 163                                 ND_CMD_SET_CONFIG_DATA, cmd, cmd_size, &cmd_rc);
 164                 if (rc < 0)
 165                         break;
 166                 if (cmd_rc < 0) {
 167                         rc = cmd_rc;
 168                         break;
 169                 }
 170         }
 171         kvfree(cmd);
 172
 173         return rc;
 174 }
 175
 176 void nvdimm_set_labeling(struct device *dev)
 177 {
 178         struct nvdimm *nvdimm = to_nvdimm(dev);
 179
 180         set_bit(NDD_LABELING, &nvdimm->flags);
 181 }
 182
 183 void nvdimm_set_locked(struct device *dev)
 184 {
 185         struct nvdimm *nvdimm = to_nvdimm(dev);
 186
 187         set_bit(NDD_LOCKED, &nvdimm->flags);
 188 }
 189
 190 void nvdimm_clear_locked(struct device *dev)
 191 {
 192         struct nvdimm *nvdimm = to_nvdimm(dev);
 193
 194         clear_bit(NDD_LOCKED, &nvdimm->flags);
 195 }
 196
 197 static void nvdimm_release(struct device *dev)
 198 {
 199         struct nvdimm *nvdimm = to_nvdimm(dev);
 200
 201         ida_simple_remove(&dimm_ida, nvdimm->id);
 202         kfree(nvdimm);
 203 }
 204
 205 struct nvdimm *to_nvdimm(struct device *dev)
 206 {
 207         struct nvdimm *nvdimm = container_of(dev, struct nvdimm, dev);
 208
 209         WARN_ON(!is_nvdimm(dev));
 210         return nvdimm;
 211 }
 212 EXPORT_SYMBOL_GPL(to_nvdimm);
 213
 214 struct nvdimm *nd_blk_region_to_dimm(struct nd_blk_region *ndbr)
 215 {
 216         struct nd_region *nd_region = &ndbr->nd_region;
 217         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
 218
 219         return nd_mapping->nvdimm;
 220 }
 221 EXPORT_SYMBOL_GPL(nd_blk_region_to_dimm);
 222
 223 unsigned long nd_blk_memremap_flags(struct nd_blk_region *ndbr)
 224 {
 225         /* pmem mapping properties are private to libnvdimm */
 226         return ARCH_MEMREMAP_PMEM;
 227 }
 228 EXPORT_SYMBOL_GPL(nd_blk_memremap_flags);
 229
 230 struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping)
 231 {
 232         struct nvdimm *nvdimm = nd_mapping->nvdimm;
 233
 234         WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev));
 235
 236         return dev_get_drvdata(&nvdimm->dev);
 237 }
 238 EXPORT_SYMBOL(to_ndd);
 239
 240 void nvdimm_drvdata_release(struct kref *kref)
 241 {
 242         struct nvdimm_drvdata *ndd = container_of(kref, typeof(*ndd), kref);
 243         struct device *dev = ndd->dev;
 244         struct resource *res, *_r;
 245
 246         dev_dbg(dev, "trace\n");
 247         nvdimm_bus_lock(dev);
 248         for_each_dpa_resource_safe(ndd, res, _r)
 249                 nvdimm_free_dpa(ndd, res);
 250         nvdimm_bus_unlock(dev);
 251
 252         kvfree(ndd->data);
 253         kfree(ndd);
 254         put_device(dev);
 255 }
 256
 257 void get_ndd(struct nvdimm_drvdata *ndd)
 258 {
 259         kref_get(&ndd->kref);
 260 }
 261
 262 void put_ndd(struct nvdimm_drvdata *ndd)
 263 {
 264         if (ndd)
 265                 kref_put(&ndd->kref, nvdimm_drvdata_release);
 266 }
 267
 268 const char *nvdimm_name(struct nvdimm *nvdimm)
 269 {
 270         return dev_name(&nvdimm->dev);
 271 }
 272 EXPORT_SYMBOL_GPL(nvdimm_name);
 273
 274 struct kobject *nvdimm_kobj(struct nvdimm *nvdimm)
 275 {
 276         return &nvdimm->dev.kobj;
 277 }
 278 EXPORT_SYMBOL_GPL(nvdimm_kobj);
 279
 280 unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm)
 281 {
 282         return nvdimm->cmd_mask;
 283 }
 284 EXPORT_SYMBOL_GPL(nvdimm_cmd_mask);
 285
 286 void *nvdimm_provider_data(struct nvdimm *nvdimm)
 287 {
 288         if (nvdimm)
 289                 return nvdimm->provider_data;
 290         return NULL;
 291 }
 292 EXPORT_SYMBOL_GPL(nvdimm_provider_data);
 293
 294 static ssize_t commands_show(struct device *dev,
 295                 struct device_attribute *attr, char *buf)
 296 {
 297         struct nvdimm *nvdimm = to_nvdimm(dev);
 298         int cmd, len = 0;
 299
 300         if (!nvdimm->cmd_mask)
 301                 return sprintf(buf, "\n");
 302
 303         for_each_set_bit(cmd, &nvdimm->cmd_mask, BITS_PER_LONG)
 304                 len += sprintf(buf + len, "%s ", nvdimm_cmd_name(cmd));
 305         len += sprintf(buf + len, "\n");
 306         return len;
 307 }
 308 static DEVICE_ATTR_RO(commands);
 309
 310 static ssize_t flags_show(struct device *dev,
 311                 struct device_attribute *attr, char *buf)
 312 {
 313         struct nvdimm *nvdimm = to_nvdimm(dev);
 314
 315         return sprintf(buf, "%s%s%s\n",
 316                         test_bit(NDD_ALIASING, &nvdimm->flags) ? "alias " : "",
 317                         test_bit(NDD_LABELING, &nvdimm->flags) ? "label " : "",
 318                         test_bit(NDD_LOCKED, &nvdimm->flags) ? "lock " : "");
 319 }
 320 static DEVICE_ATTR_RO(flags);
 321
 322 static ssize_t state_show(struct device *dev, struct device_attribute *attr,
 323                 char *buf)
 324 {
 325         struct nvdimm *nvdimm = to_nvdimm(dev);
 326
 327         /*
 328          * The state may be in the process of changing, userspace should
 329          * quiesce probing if it wants a static answer
 330          */
 331         nvdimm_bus_lock(dev);
 332         nvdimm_bus_unlock(dev);
 333         return sprintf(buf, "%s\n", atomic_read(&nvdimm->busy)
 334                         ? "active" : "idle");
 335 }
 336 static DEVICE_ATTR_RO(state);
 337
 338 static ssize_t available_slots_show(struct device *dev,
 339                 struct device_attribute *attr, char *buf)
 340 {
 341         struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
 342         ssize_t rc;
 343         u32 nfree;
 344
 345         if (!ndd)
 346                 return -ENXIO;
 347
 348         nvdimm_bus_lock(dev);
 349         nfree = nd_label_nfree(ndd);
 350         if (nfree - 1 > nfree) {
 351                 dev_WARN_ONCE(dev, 1, "we ate our last label?\n");
 352                 nfree = 0;
 353         } else
 354                 nfree--;
 355         rc = sprintf(buf, "%d\n", nfree);
 356         nvdimm_bus_unlock(dev);
 357         return rc;
 358 }
 359 static DEVICE_ATTR_RO(available_slots);
 360
 361 __weak ssize_t security_show(struct device *dev,
 362                 struct device_attribute *attr, char *buf)
 363 {
 364         struct nvdimm *nvdimm = to_nvdimm(dev);
 365
 366         if (test_bit(NVDIMM_SECURITY_DISABLED, &nvdimm->sec.flags))
 367                 return sprintf(buf, "disabled\n");
 368         if (test_bit(NVDIMM_SECURITY_UNLOCKED, &nvdimm->sec.flags))
 369                 return sprintf(buf, "unlocked\n");
 370         if (test_bit(NVDIMM_SECURITY_LOCKED, &nvdimm->sec.flags))
 371                 return sprintf(buf, "locked\n");
 372         if (test_bit(NVDIMM_SECURITY_OVERWRITE, &nvdimm->sec.flags))
 373                 return sprintf(buf, "overwrite\n");
 374         return -ENOTTY;
 375 }
 376
 377 static ssize_t frozen_show(struct device *dev,
 378                 struct device_attribute *attr, char *buf)
 379 {
 380         struct nvdimm *nvdimm = to_nvdimm(dev);
 381
 382         return sprintf(buf, "%d\n", test_bit(NVDIMM_SECURITY_FROZEN,
 383                                 &nvdimm->sec.flags));
 384 }
 385 static DEVICE_ATTR_RO(frozen);
 386
 387 static ssize_t security_store(struct device *dev,
 388                 struct device_attribute *attr, const char *buf, size_t len)
 389
 390 {
 391         ssize_t rc;
 392
 393         /*
 394          * Require all userspace triggered security management to be
 395          * done while probing is idle and the DIMM is not in active use
 396          * in any region.
 397          */
 398         nd_device_lock(dev);
 399         nvdimm_bus_lock(dev);
 400         wait_nvdimm_bus_probe_idle(dev);
 401         rc = nvdimm_security_store(dev, buf, len);
 402         nvdimm_bus_unlock(dev);
 403         nd_device_unlock(dev);
 404
 405         return rc;
 406 }
 407 static DEVICE_ATTR_RW(security);
 408
 409 static struct attribute *nvdimm_attributes[] = {
 410         &dev_attr_state.attr,
 411         &dev_attr_flags.attr,
 412         &dev_attr_commands.attr,
 413         &dev_attr_available_slots.attr,
 414         &dev_attr_security.attr,
 415         &dev_attr_frozen.attr,
 416         NULL,
 417 };
 418
 419 static umode_t nvdimm_visible(struct kobject *kobj, struct attribute *a, int n)
 420 {
 421         struct device *dev = container_of(kobj, typeof(*dev), kobj);
 422         struct nvdimm *nvdimm = to_nvdimm(dev);
 423
 424         if (a != &dev_attr_security.attr && a != &dev_attr_frozen.attr)
 425                 return a->mode;
 426         if (!nvdimm->sec.flags)
 427                 return 0;
 428
 429         if (a == &dev_attr_security.attr) {
 430                 /* Are there any state mutation ops (make writable)? */
 431                 if (nvdimm->sec.ops->freeze || nvdimm->sec.ops->disable
 432                                 || nvdimm->sec.ops->change_key
 433                                 || nvdimm->sec.ops->erase
 434                                 || nvdimm->sec.ops->overwrite)
 435                         return a->mode;
 436                 return 0444;
 437         }
 438
 439         if (nvdimm->sec.ops->freeze)
 440                 return a->mode;
 441         return 0;
 442 }
 443
 444 static const struct attribute_group nvdimm_attribute_group = {
 445         .attrs = nvdimm_attributes,
 446         .is_visible = nvdimm_visible,
 447 };
 448
 449 static ssize_t result_show(struct device *dev, struct device_attribute *attr, char *buf)
 450 {
 451         struct nvdimm *nvdimm = to_nvdimm(dev);
 452         enum nvdimm_fwa_result result;
 453
 454         if (!nvdimm->fw_ops)
 455                 return -EOPNOTSUPP;
 456
 457         nvdimm_bus_lock(dev);
 458         result = nvdimm->fw_ops->activate_result(nvdimm);
 459         nvdimm_bus_unlock(dev);
 460
 461         switch (result) {
 462         case NVDIMM_FWA_RESULT_NONE:
 463                 return sprintf(buf, "none\n");
 464         case NVDIMM_FWA_RESULT_SUCCESS:
 465                 return sprintf(buf, "success\n");
 466         case NVDIMM_FWA_RESULT_FAIL:
 467                 return sprintf(buf, "fail\n");
 468         case NVDIMM_FWA_RESULT_NOTSTAGED:
 469                 return sprintf(buf, "not_staged\n");
 470         case NVDIMM_FWA_RESULT_NEEDRESET:
 471                 return sprintf(buf, "need_reset\n");
 472         default:
 473                 return -ENXIO;
 474         }
 475 }
 476 static DEVICE_ATTR_ADMIN_RO(result);
 477
 478 static ssize_t activate_show(struct device *dev, struct device_attribute *attr, char *buf)
 479 {
 480         struct nvdimm *nvdimm = to_nvdimm(dev);
 481         enum nvdimm_fwa_state state;
 482
 483         if (!nvdimm->fw_ops)
 484                 return -EOPNOTSUPP;
 485
 486         nvdimm_bus_lock(dev);
 487         state = nvdimm->fw_ops->activate_state(nvdimm);
 488         nvdimm_bus_unlock(dev);
 489
 490         switch (state) {
 491         case NVDIMM_FWA_IDLE:
 492                 return sprintf(buf, "idle\n");
 493         case NVDIMM_FWA_BUSY:
 494                 return sprintf(buf, "busy\n");
 495         case NVDIMM_FWA_ARMED:
 496                 return sprintf(buf, "armed\n");
 497         default:
 498                 return -ENXIO;
 499         }
 500 }
 501
 502 static ssize_t activate_store(struct device *dev, struct device_attribute *attr,
 503                 const char *buf, size_t len)
 504 {
 505         struct nvdimm *nvdimm = to_nvdimm(dev);
 506         enum nvdimm_fwa_trigger arg;
 507         int rc;
 508
 509         if (!nvdimm->fw_ops)
 510                 return -EOPNOTSUPP;
 511
 512         if (sysfs_streq(buf, "arm"))
 513                 arg = NVDIMM_FWA_ARM;
 514         else if (sysfs_streq(buf, "disarm"))
 515                 arg = NVDIMM_FWA_DISARM;
 516         else
 517                 return -EINVAL;
 518
 519         nvdimm_bus_lock(dev);
 520         rc = nvdimm->fw_ops->arm(nvdimm, arg);
 521         nvdimm_bus_unlock(dev);
 522
 523         if (rc < 0)
 524                 return rc;
 525         return len;
 526 }
 527 static DEVICE_ATTR_ADMIN_RW(activate);
 528
 529 static struct attribute *nvdimm_firmware_attributes[] = {
 530         &dev_attr_activate.attr,
 531         &dev_attr_result.attr,
 532 };
 533
 534 static umode_t nvdimm_firmware_visible(struct kobject *kobj, struct attribute *a, int n)
 535 {
 536         struct device *dev = container_of(kobj, typeof(*dev), kobj);
 537         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
 538         struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
 539         struct nvdimm *nvdimm = to_nvdimm(dev);
 540         enum nvdimm_fwa_capability cap;
 541
 542         if (!nd_desc->fw_ops)
 543                 return 0;
 544         if (!nvdimm->fw_ops)
 545                 return 0;
 546
 547         nvdimm_bus_lock(dev);
 548         cap = nd_desc->fw_ops->capability(nd_desc);
 549         nvdimm_bus_unlock(dev);
 550
 551         if (cap < NVDIMM_FWA_CAP_QUIESCE)
 552                 return 0;
 553
 554         return a->mode;
 555 }
 556
 557 static const struct attribute_group nvdimm_firmware_attribute_group = {
 558         .name = "firmware",
 559         .attrs = nvdimm_firmware_attributes,
 560         .is_visible = nvdimm_firmware_visible,
 561 };
 562
 563 static const struct attribute_group *nvdimm_attribute_groups[] = {
 564         &nd_device_attribute_group,
 565         &nvdimm_attribute_group,
 566         &nvdimm_firmware_attribute_group,
 567         NULL,
 568 };
 569
 570 static const struct device_type nvdimm_device_type = {
 571         .name = "nvdimm",
 572         .release = nvdimm_release,
 573         .groups = nvdimm_attribute_groups,
 574 };
 575
 576 bool is_nvdimm(struct device *dev)
 577 {
 578         return dev->type == &nvdimm_device_type;
 579 }
 580
 581 struct nvdimm *__nvdimm_create(struct nvdimm_bus *nvdimm_bus,
 582                 void *provider_data, const struct attribute_group **groups,
 583                 unsigned long flags, unsigned long cmd_mask, int num_flush,
 584                 struct resource *flush_wpq, const char *dimm_id,
 585                 const struct nvdimm_security_ops *sec_ops)
 586 {
 587         struct nvdimm *nvdimm = kzalloc(sizeof(*nvdimm), GFP_KERNEL);
 588         struct device *dev;
 589
 590         if (!nvdimm)
 591                 return NULL;
 592
 593         nvdimm->id = ida_simple_get(&dimm_ida, 0, 0, GFP_KERNEL);
 594         if (nvdimm->id < 0) {
 595                 kfree(nvdimm);
 596                 return NULL;
 597         }
 598
 599         nvdimm->dimm_id = dimm_id;
 600         nvdimm->provider_data = provider_data;
 601         if (noblk)
 602                 flags |= 1 << NDD_NOBLK;
 603         nvdimm->flags = flags;
 604         nvdimm->cmd_mask = cmd_mask;
 605         nvdimm->num_flush = num_flush;
 606         nvdimm->flush_wpq = flush_wpq;
 607         atomic_set(&nvdimm->busy, 0);
 608         dev = &nvdimm->dev;
 609         dev_set_name(dev, "nmem%d", nvdimm->id);
 610         dev->parent = &nvdimm_bus->dev;
 611         dev->type = &nvdimm_device_type;
 612         dev->devt = MKDEV(nvdimm_major, nvdimm->id);
 613         dev->groups = groups;
 614         nvdimm->sec.ops = sec_ops;
 615         nvdimm->sec.overwrite_tmo = 0;
 616         INIT_DELAYED_WORK(&nvdimm->dwork, nvdimm_security_overwrite_query);
 617         /*
 618          * Security state must be initialized before device_add() for
 619          * attribute visibility.
 620          */
 621         /* get security state and extended (master) state */
 622         nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER);
 623         nvdimm->sec.ext_flags = nvdimm_security_flags(nvdimm, NVDIMM_MASTER);
 624         nd_device_register(dev);
 625
 626         return nvdimm;
 627 }
 628 EXPORT_SYMBOL_GPL(__nvdimm_create);
 629
 630 static void shutdown_security_notify(void *data)
 631 {
 632         struct nvdimm *nvdimm = data;
 633
 634         sysfs_put(nvdimm->sec.overwrite_state);
 635 }
 636
 637 int nvdimm_security_setup_events(struct device *dev)
 638 {
 639         struct nvdimm *nvdimm = to_nvdimm(dev);
 640
 641         if (!nvdimm->sec.flags || !nvdimm->sec.ops
 642                         || !nvdimm->sec.ops->overwrite)
 643                 return 0;
 644         nvdimm->sec.overwrite_state = sysfs_get_dirent(dev->kobj.sd, "security");
 645         if (!nvdimm->sec.overwrite_state)
 646                 return -ENOMEM;
 647
 648         return devm_add_action_or_reset(dev, shutdown_security_notify, nvdimm);
 649 }
 650 EXPORT_SYMBOL_GPL(nvdimm_security_setup_events);
 651
 652 int nvdimm_in_overwrite(struct nvdimm *nvdimm)
 653 {
 654         return test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags);
 655 }
 656 EXPORT_SYMBOL_GPL(nvdimm_in_overwrite);
 657
 658 int nvdimm_security_freeze(struct nvdimm *nvdimm)
 659 {
 660         int rc;
 661
 662         WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev));
 663
 664         if (!nvdimm->sec.ops || !nvdimm->sec.ops->freeze)
 665                 return -EOPNOTSUPP;
 666
 667         if (!nvdimm->sec.flags)
 668                 return -EIO;
 669
 670         if (test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags)) {
 671                 dev_warn(&nvdimm->dev, "Overwrite operation in progress.\n");
 672                 return -EBUSY;
 673         }
 674
 675         rc = nvdimm->sec.ops->freeze(nvdimm);
 676         nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER);
 677
 678         return rc;
 679 }
 680
 681 static unsigned long dpa_align(struct nd_region *nd_region)
 682 {
 683         struct device *dev = &nd_region->dev;
 684
 685         if (dev_WARN_ONCE(dev, !is_nvdimm_bus_locked(dev),
 686                                 "bus lock required for capacity provision\n"))
 687                 return 0;
 688         if (dev_WARN_ONCE(dev, !nd_region->ndr_mappings || nd_region->align
 689                                 % nd_region->ndr_mappings,
 690                                 "invalid region align %#lx mappings: %d\n",
 691                                 nd_region->align, nd_region->ndr_mappings))
 692                 return 0;
 693         return nd_region->align / nd_region->ndr_mappings;
 694 }
 695
 696 int alias_dpa_busy(struct device *dev, void *data)
 697 {
 698         resource_size_t map_end, blk_start, new;
 699         struct blk_alloc_info *info = data;
 700         struct nd_mapping *nd_mapping;
 701         struct nd_region *nd_region;
 702         struct nvdimm_drvdata *ndd;
 703         struct resource *res;
 704         unsigned long align;
 705         int i;
 706
 707         if (!is_memory(dev))
 708                 return 0;
 709
 710         nd_region = to_nd_region(dev);
 711         for (i = 0; i < nd_region->ndr_mappings; i++) {
 712                 nd_mapping  = &nd_region->mapping[i];
 713                 if (nd_mapping->nvdimm == info->nd_mapping->nvdimm)
 714                         break;
 715         }
 716
 717         if (i >= nd_region->ndr_mappings)
 718                 return 0;
 719
 720         ndd = to_ndd(nd_mapping);
 721         map_end = nd_mapping->start + nd_mapping->size - 1;
 722         blk_start = nd_mapping->start;
 723
 724         /*
 725          * In the allocation case ->res is set to free space that we are
 726          * looking to validate against PMEM aliasing collision rules
 727          * (i.e. BLK is allocated after all aliased PMEM).
 728          */
 729         if (info->res) {
 730                 if (info->res->start >= nd_mapping->start
 731                                 && info->res->start < map_end)
 732                         /* pass */;
 733                 else
 734                         return 0;
 735         }
 736
 737  retry:
 738         /*
 739          * Find the free dpa from the end of the last pmem allocation to
 740          * the end of the interleave-set mapping.
 741          */
 742         align = dpa_align(nd_region);
 743         if (!align)
 744                 return 0;
 745
 746         for_each_dpa_resource(ndd, res) {
 747                 resource_size_t start, end;
 748
 749                 if (strncmp(res->name, "pmem", 4) != 0)
 750                         continue;
 751
 752                 start = ALIGN_DOWN(res->start, align);
 753                 end = ALIGN(res->end + 1, align) - 1;
 754                 if ((start >= blk_start && start < map_end)
 755                                 || (end >= blk_start && end <= map_end)) {
 756                         new = max(blk_start, min(map_end, end) + 1);
 757                         if (new != blk_start) {
 758                                 blk_start = new;
 759                                 goto retry;
 760                         }
 761                 }
 762         }
 763
 764         /* update the free space range with the probed blk_start */
 765         if (info->res && blk_start > info->res->start) {
 766                 info->res->start = max(info->res->start, blk_start);
 767                 if (info->res->start > info->res->end)
 768                         info->res->end = info->res->start - 1;
 769                 return 1;
 770         }
 771
 772         info->available -= blk_start - nd_mapping->start;
 773
 774         return 0;
 775 }
 776
 777 /**
 778  * nd_blk_available_dpa - account the unused dpa of BLK region
 779  * @nd_mapping: container of dpa-resource-root + labels
 780  *
 781  * Unlike PMEM, BLK namespaces can occupy discontiguous DPA ranges, but
 782  * we arrange for them to never start at an lower dpa than the last
 783  * PMEM allocation in an aliased region.
 784  */
 785 resource_size_t nd_blk_available_dpa(struct nd_region *nd_region)
 786 {
 787         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
 788         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
 789         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 790         struct blk_alloc_info info = {
 791                 .nd_mapping = nd_mapping,
 792                 .available = nd_mapping->size,
 793                 .res = NULL,
 794         };
 795         struct resource *res;
 796         unsigned long align;
 797
 798         if (!ndd)
 799                 return 0;
 800
 801         device_for_each_child(&nvdimm_bus->dev, &info, alias_dpa_busy);
 802
 803         /* now account for busy blk allocations in unaliased dpa */
 804         align = dpa_align(nd_region);
 805         if (!align)
 806                 return 0;
 807         for_each_dpa_resource(ndd, res) {
 808                 resource_size_t start, end, size;
 809
 810                 if (strncmp(res->name, "blk", 3) != 0)
 811                         continue;
 812                 start = ALIGN_DOWN(res->start, align);
 813                 end = ALIGN(res->end + 1, align) - 1;
 814                 size = end - start + 1;
 815                 if (size >= info.available)
 816                         return 0;
 817                 info.available -= size;
 818         }
 819
 820         return info.available;
 821 }
 822
 823 /**
 824  * nd_pmem_max_contiguous_dpa - For the given dimm+region, return the max
 825  *                         contiguous unallocated dpa range.
 826  * @nd_region: constrain available space check to this reference region
 827  * @nd_mapping: container of dpa-resource-root + labels
 828  */
 829 resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region,
 830                                            struct nd_mapping *nd_mapping)
 831 {
 832         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 833         struct nvdimm_bus *nvdimm_bus;
 834         resource_size_t max = 0;
 835         struct resource *res;
 836         unsigned long align;
 837
 838         /* if a dimm is disabled the available capacity is zero */
 839         if (!ndd)
 840                 return 0;
 841
 842         align = dpa_align(nd_region);
 843         if (!align)
 844                 return 0;
 845
 846         nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
 847         if (__reserve_free_pmem(&nd_region->dev, nd_mapping->nvdimm))
 848                 return 0;
 849         for_each_dpa_resource(ndd, res) {
 850                 resource_size_t start, end;
 851
 852                 if (strcmp(res->name, "pmem-reserve") != 0)
 853                         continue;
 854                 /* trim free space relative to current alignment setting */
 855                 start = ALIGN(res->start, align);
 856                 end = ALIGN_DOWN(res->end + 1, align) - 1;
 857                 if (end < start)
 858                         continue;
 859                 if (end - start + 1 > max)
 860                         max = end - start + 1;
 861         }
 862         release_free_pmem(nvdimm_bus, nd_mapping);
 863         return max;
 864 }
 865
 866 /**
 867  * nd_pmem_available_dpa - for the given dimm+region account unallocated dpa
 868  * @nd_mapping: container of dpa-resource-root + labels
 869  * @nd_region: constrain available space check to this reference region
 870  * @overlap: calculate available space assuming this level of overlap
 871  *
 872  * Validate that a PMEM label, if present, aligns with the start of an
 873  * interleave set and truncate the available size at the lowest BLK
 874  * overlap point.
 875  *
 876  * The expectation is that this routine is called multiple times as it
 877  * probes for the largest BLK encroachment for any single member DIMM of
 878  * the interleave set.  Once that value is determined the PMEM-limit for
 879  * the set can be established.
 880  */
 881 resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region,
 882                 struct nd_mapping *nd_mapping, resource_size_t *overlap)
 883 {
 884         resource_size_t map_start, map_end, busy = 0, available, blk_start;
 885         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 886         struct resource *res;
 887         const char *reason;
 888         unsigned long align;
 889
 890         if (!ndd)
 891                 return 0;
 892
 893         align = dpa_align(nd_region);
 894         if (!align)
 895                 return 0;
 896
 897         map_start = nd_mapping->start;
 898         map_end = map_start + nd_mapping->size - 1;
 899         blk_start = max(map_start, map_end + 1 - *overlap);
 900         for_each_dpa_resource(ndd, res) {
 901                 resource_size_t start, end;
 902
 903                 start = ALIGN_DOWN(res->start, align);
 904                 end = ALIGN(res->end + 1, align) - 1;
 905                 if (start >= map_start && start < map_end) {
 906                         if (strncmp(res->name, "blk", 3) == 0)
 907                                 blk_start = min(blk_start,
 908                                                 max(map_start, start));
 909                         else if (end > map_end) {
 910                                 reason = "misaligned to iset";
 911                                 goto err;
 912                         } else
 913                                 busy += end - start + 1;
 914                 } else if (end >= map_start && end <= map_end) {
 915                         if (strncmp(res->name, "blk", 3) == 0) {
 916                                 /*
 917                                  * If a BLK allocation overlaps the start of
 918                                  * PMEM the entire interleave set may now only
 919                                  * be used for BLK.
 920                                  */
 921                                 blk_start = map_start;
 922                         } else
 923                                 busy += end - start + 1;
 924                 } else if (map_start > start && map_start < end) {
 925                         /* total eclipse of the mapping */
 926                         busy += nd_mapping->size;
 927                         blk_start = map_start;
 928                 }
 929         }
 930
 931         *overlap = map_end + 1 - blk_start;
 932         available = blk_start - map_start;
 933         if (busy < available)
 934                 return ALIGN_DOWN(available - busy, align);
 935         return 0;
 936
 937  err:
 938         nd_dbg_dpa(nd_region, ndd, res, "%s\n", reason);
 939         return 0;
 940 }
 941
 942 void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res)
 943 {
 944         WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
 945         kfree(res->name);
 946         __release_region(&ndd->dpa, res->start, resource_size(res));
 947 }
 948
 949 struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
 950                 struct nd_label_id *label_id, resource_size_t start,
 951                 resource_size_t n)
 952 {
 953         char *name = kmemdup(label_id, sizeof(*label_id), GFP_KERNEL);
 954         struct resource *res;
 955
 956         if (!name)
 957                 return NULL;
 958
 959         WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
 960         res = __request_region(&ndd->dpa, start, n, name, 0);
 961         if (!res)
 962                 kfree(name);
 963         return res;
 964 }
 965
 966 /**
 967  * nvdimm_allocated_dpa - sum up the dpa currently allocated to this label_id
 968  * @nvdimm: container of dpa-resource-root + labels
 969  * @label_id: dpa resource name of the form {pmem|blk}-<human readable uuid>
 970  */
 971 resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd,
 972                 struct nd_label_id *label_id)
 973 {
 974         resource_size_t allocated = 0;
 975         struct resource *res;
 976
 977         for_each_dpa_resource(ndd, res)
 978                 if (strcmp(res->name, label_id->id) == 0)
 979                         allocated += resource_size(res);
 980
 981         return allocated;
 982 }
 983
 984 static int count_dimms(struct device *dev, void *c)
 985 {
 986         int *count = c;
 987
 988         if (is_nvdimm(dev))
 989                 (*count)++;
 990         return 0;
 991 }
 992
 993 int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count)
 994 {
 995         int count = 0;
 996         /* Flush any possible dimm registration failures */
 997         nd_synchronize();
 998
 999         device_for_each_child(&nvdimm_bus->dev, &count, count_dimms);
1000         dev_dbg(&nvdimm_bus->dev, "count: %d\n", count);
1001         if (count != dimm_count)
1002                 return -ENXIO;
1003         return 0;
1004 }
1005 EXPORT_SYMBOL_GPL(nvdimm_bus_check_dimm_count);
1006
1007 void __exit nvdimm_devs_exit(void)
1008 {
1009         ida_destroy(&dimm_ida);
1010 }