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