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 * @ndd: dimm to initialize 57 * 58 * Returns: %0 if the area is already valid, -errno on error 59 */ 60int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd) 61{ 62 struct nd_cmd_get_config_size *cmd = &ndd->nsarea; 63 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev); 64 struct nvdimm_bus_descriptor *nd_desc; 65 int rc = validate_dimm(ndd); 66 int cmd_rc = 0; 67 68 if (rc) 69 return rc; 70 71 if (cmd->config_size) 72 return 0; /* already valid */ 73 74 memset(cmd, 0, sizeof(*cmd)); 75 nd_desc = nvdimm_bus->nd_desc; 76 rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev), 77 ND_CMD_GET_CONFIG_SIZE, cmd, sizeof(*cmd), &cmd_rc); 78 if (rc < 0) 79 return rc; 80 return cmd_rc; 81} 82 83int nvdimm_get_config_data(struct nvdimm_drvdata *ndd, void *buf, 84 size_t offset, size_t len) 85{ 86 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev); 87 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; 88 int rc = validate_dimm(ndd), cmd_rc = 0; 89 struct nd_cmd_get_config_data_hdr *cmd; 90 size_t max_cmd_size, buf_offset; 91 92 if (rc) 93 return rc; 94 95 if (offset + len > ndd->nsarea.config_size) 96 return -ENXIO; 97 98 max_cmd_size = min_t(u32, len, ndd->nsarea.max_xfer); 99 cmd = kvzalloc(max_cmd_size + sizeof(*cmd), GFP_KERNEL); 100 if (!cmd) 101 return -ENOMEM; 102 103 for (buf_offset = 0; len; 104 len -= cmd->in_length, buf_offset += cmd->in_length) { 105 size_t cmd_size; 106 107 cmd->in_offset = offset + buf_offset; 108 cmd->in_length = min(max_cmd_size, len); 109 110 cmd_size = sizeof(*cmd) + cmd->in_length; 111 112 rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev), 113 ND_CMD_GET_CONFIG_DATA, cmd, cmd_size, &cmd_rc); 114 if (rc < 0) 115 break; 116 if (cmd_rc < 0) { 117 rc = cmd_rc; 118 break; 119 } 120 121 /* out_buf should be valid, copy it into our output buffer */ 122 memcpy(buf + buf_offset, cmd->out_buf, cmd->in_length); 123 } 124 kvfree(cmd); 125 126 return rc; 127} 128 129int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset, 130 void *buf, size_t len) 131{ 132 size_t max_cmd_size, buf_offset; 133 struct nd_cmd_set_config_hdr *cmd; 134 int rc = validate_dimm(ndd), cmd_rc = 0; 135 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev); 136 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; 137 138 if (rc) 139 return rc; 140 141 if (offset + len > ndd->nsarea.config_size) 142 return -ENXIO; 143 144 max_cmd_size = min_t(u32, len, ndd->nsarea.max_xfer); 145 cmd = kvzalloc(max_cmd_size + sizeof(*cmd) + sizeof(u32), GFP_KERNEL); 146 if (!cmd) 147 return -ENOMEM; 148 149 for (buf_offset = 0; len; len -= cmd->in_length, 150 buf_offset += cmd->in_length) { 151 size_t cmd_size; 152 153 cmd->in_offset = offset + buf_offset; 154 cmd->in_length = min(max_cmd_size, len); 155 memcpy(cmd->in_buf, buf + buf_offset, cmd->in_length); 156 157 /* status is output in the last 4-bytes of the command buffer */ 158 cmd_size = sizeof(*cmd) + cmd->in_length + sizeof(u32); 159 160 rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev), 161 ND_CMD_SET_CONFIG_DATA, cmd, cmd_size, &cmd_rc); 162 if (rc < 0) 163 break; 164 if (cmd_rc < 0) { 165 rc = cmd_rc; 166 break; 167 } 168 } 169 kvfree(cmd); 170 171 return rc; 172} 173 174void nvdimm_set_labeling(struct device *dev) 175{ 176 struct nvdimm *nvdimm = to_nvdimm(dev); 177 178 set_bit(NDD_LABELING, &nvdimm->flags); 179} 180 181void nvdimm_set_locked(struct device *dev) 182{ 183 struct nvdimm *nvdimm = to_nvdimm(dev); 184 185 set_bit(NDD_LOCKED, &nvdimm->flags); 186} 187 188void nvdimm_clear_locked(struct device *dev) 189{ 190 struct nvdimm *nvdimm = to_nvdimm(dev); 191 192 clear_bit(NDD_LOCKED, &nvdimm->flags); 193} 194 195static void nvdimm_release(struct device *dev) 196{ 197 struct nvdimm *nvdimm = to_nvdimm(dev); 198 199 ida_free(&dimm_ida, nvdimm->id); 200 kfree(nvdimm); 201} 202 203struct nvdimm *to_nvdimm(struct device *dev) 204{ 205 struct nvdimm *nvdimm = container_of(dev, struct nvdimm, dev); 206 207 WARN_ON(!is_nvdimm(dev)); 208 return nvdimm; 209} 210EXPORT_SYMBOL_GPL(to_nvdimm); 211 212struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping) 213{ 214 struct nvdimm *nvdimm = nd_mapping->nvdimm; 215 216 WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev)); 217 218 return dev_get_drvdata(&nvdimm->dev); 219} 220EXPORT_SYMBOL(to_ndd); 221 222void nvdimm_drvdata_release(struct kref *kref) 223{ 224 struct nvdimm_drvdata *ndd = container_of(kref, typeof(*ndd), kref); 225 struct device *dev = ndd->dev; 226 struct resource *res, *_r; 227 228 dev_dbg(dev, "trace\n"); 229 nvdimm_bus_lock(dev); 230 for_each_dpa_resource_safe(ndd, res, _r) 231 nvdimm_free_dpa(ndd, res); 232 nvdimm_bus_unlock(dev); 233 234 kvfree(ndd->data); 235 kfree(ndd); 236 put_device(dev); 237} 238 239void get_ndd(struct nvdimm_drvdata *ndd) 240{ 241 kref_get(&ndd->kref); 242} 243 244void put_ndd(struct nvdimm_drvdata *ndd) 245{ 246 if (ndd) 247 kref_put(&ndd->kref, nvdimm_drvdata_release); 248} 249 250const char *nvdimm_name(struct nvdimm *nvdimm) 251{ 252 return dev_name(&nvdimm->dev); 253} 254EXPORT_SYMBOL_GPL(nvdimm_name); 255 256struct kobject *nvdimm_kobj(struct nvdimm *nvdimm) 257{ 258 return &nvdimm->dev.kobj; 259} 260EXPORT_SYMBOL_GPL(nvdimm_kobj); 261 262unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm) 263{ 264 return nvdimm->cmd_mask; 265} 266EXPORT_SYMBOL_GPL(nvdimm_cmd_mask); 267 268void *nvdimm_provider_data(struct nvdimm *nvdimm) 269{ 270 if (nvdimm) 271 return nvdimm->provider_data; 272 return NULL; 273} 274EXPORT_SYMBOL_GPL(nvdimm_provider_data); 275 276static ssize_t commands_show(struct device *dev, 277 struct device_attribute *attr, char *buf) 278{ 279 struct nvdimm *nvdimm = to_nvdimm(dev); 280 int cmd, len = 0; 281 282 if (!nvdimm->cmd_mask) 283 return sprintf(buf, "\n"); 284 285 for_each_set_bit(cmd, &nvdimm->cmd_mask, BITS_PER_LONG) 286 len += sprintf(buf + len, "%s ", nvdimm_cmd_name(cmd)); 287 len += sprintf(buf + len, "\n"); 288 return len; 289} 290static DEVICE_ATTR_RO(commands); 291 292static ssize_t flags_show(struct device *dev, 293 struct device_attribute *attr, char *buf) 294{ 295 struct nvdimm *nvdimm = to_nvdimm(dev); 296 297 return sprintf(buf, "%s%s\n", 298 test_bit(NDD_LABELING, &nvdimm->flags) ? "label " : "", 299 test_bit(NDD_LOCKED, &nvdimm->flags) ? "lock " : ""); 300} 301static DEVICE_ATTR_RO(flags); 302 303static ssize_t state_show(struct device *dev, struct device_attribute *attr, 304 char *buf) 305{ 306 struct nvdimm *nvdimm = to_nvdimm(dev); 307 308 /* 309 * The state may be in the process of changing, userspace should 310 * quiesce probing if it wants a static answer 311 */ 312 nvdimm_bus_lock(dev); 313 nvdimm_bus_unlock(dev); 314 return sprintf(buf, "%s\n", atomic_read(&nvdimm->busy) 315 ? "active" : "idle"); 316} 317static DEVICE_ATTR_RO(state); 318 319static ssize_t __available_slots_show(struct nvdimm_drvdata *ndd, char *buf) 320{ 321 struct device *dev; 322 ssize_t rc; 323 u32 nfree; 324 325 if (!ndd) 326 return -ENXIO; 327 328 dev = ndd->dev; 329 nvdimm_bus_lock(dev); 330 nfree = nd_label_nfree(ndd); 331 if (nfree - 1 > nfree) { 332 dev_WARN_ONCE(dev, 1, "we ate our last label?\n"); 333 nfree = 0; 334 } else 335 nfree--; 336 rc = sprintf(buf, "%d\n", nfree); 337 nvdimm_bus_unlock(dev); 338 return rc; 339} 340 341static ssize_t available_slots_show(struct device *dev, 342 struct device_attribute *attr, char *buf) 343{ 344 ssize_t rc; 345 346 device_lock(dev); 347 rc = __available_slots_show(dev_get_drvdata(dev), buf); 348 device_unlock(dev); 349 350 return rc; 351} 352static DEVICE_ATTR_RO(available_slots); 353 354static ssize_t security_show(struct device *dev, 355 struct device_attribute *attr, char *buf) 356{ 357 struct nvdimm *nvdimm = to_nvdimm(dev); 358 359 /* 360 * For the test version we need to poll the "hardware" in order 361 * to get the updated status for unlock testing. 362 */ 363 if (IS_ENABLED(CONFIG_NVDIMM_SECURITY_TEST)) 364 nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER); 365 366 if (test_bit(NVDIMM_SECURITY_OVERWRITE, &nvdimm->sec.flags)) 367 return sprintf(buf, "overwrite\n"); 368 if (test_bit(NVDIMM_SECURITY_DISABLED, &nvdimm->sec.flags)) 369 return sprintf(buf, "disabled\n"); 370 if (test_bit(NVDIMM_SECURITY_UNLOCKED, &nvdimm->sec.flags)) 371 return sprintf(buf, "unlocked\n"); 372 if (test_bit(NVDIMM_SECURITY_LOCKED, &nvdimm->sec.flags)) 373 return sprintf(buf, "locked\n"); 374 return -ENOTTY; 375} 376 377static 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} 385static DEVICE_ATTR_RO(frozen); 386 387static 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 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 device_unlock(dev); 404 405 return rc; 406} 407static DEVICE_ATTR_RW(security); 408 409static 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 419static 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 444static const struct attribute_group nvdimm_attribute_group = { 445 .attrs = nvdimm_attributes, 446 .is_visible = nvdimm_visible, 447}; 448 449static 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} 476static DEVICE_ATTR_ADMIN_RO(result); 477 478static 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 502static 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} 527static DEVICE_ATTR_ADMIN_RW(activate); 528 529static struct attribute *nvdimm_firmware_attributes[] = { 530 &dev_attr_activate.attr, 531 &dev_attr_result.attr, 532 NULL, 533}; 534 535static umode_t nvdimm_firmware_visible(struct kobject *kobj, struct attribute *a, int n) 536{ 537 struct device *dev = container_of(kobj, typeof(*dev), kobj); 538 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); 539 struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; 540 struct nvdimm *nvdimm = to_nvdimm(dev); 541 enum nvdimm_fwa_capability cap; 542 543 if (!nd_desc->fw_ops) 544 return 0; 545 if (!nvdimm->fw_ops) 546 return 0; 547 548 nvdimm_bus_lock(dev); 549 cap = nd_desc->fw_ops->capability(nd_desc); 550 nvdimm_bus_unlock(dev); 551 552 if (cap < NVDIMM_FWA_CAP_QUIESCE) 553 return 0; 554 555 return a->mode; 556} 557 558static const struct attribute_group nvdimm_firmware_attribute_group = { 559 .name = "firmware", 560 .attrs = nvdimm_firmware_attributes, 561 .is_visible = nvdimm_firmware_visible, 562}; 563 564static const struct attribute_group *nvdimm_attribute_groups[] = { 565 &nd_device_attribute_group, 566 &nvdimm_attribute_group, 567 &nvdimm_firmware_attribute_group, 568 NULL, 569}; 570 571static const struct device_type nvdimm_device_type = { 572 .name = "nvdimm", 573 .release = nvdimm_release, 574 .groups = nvdimm_attribute_groups, 575}; 576 577bool is_nvdimm(const struct device *dev) 578{ 579 return dev->type == &nvdimm_device_type; 580} 581 582static struct lock_class_key nvdimm_key; 583 584struct nvdimm *__nvdimm_create(struct nvdimm_bus *nvdimm_bus, 585 void *provider_data, const struct attribute_group **groups, 586 unsigned long flags, unsigned long cmd_mask, int num_flush, 587 struct resource *flush_wpq, const char *dimm_id, 588 const struct nvdimm_security_ops *sec_ops, 589 const struct nvdimm_fw_ops *fw_ops) 590{ 591 struct nvdimm *nvdimm = kzalloc(sizeof(*nvdimm), GFP_KERNEL); 592 struct device *dev; 593 594 if (!nvdimm) 595 return NULL; 596 597 nvdimm->id = ida_alloc(&dimm_ida, GFP_KERNEL); 598 if (nvdimm->id < 0) { 599 kfree(nvdimm); 600 return NULL; 601 } 602 603 nvdimm->dimm_id = dimm_id; 604 nvdimm->provider_data = provider_data; 605 nvdimm->flags = flags; 606 nvdimm->cmd_mask = cmd_mask; 607 nvdimm->num_flush = num_flush; 608 nvdimm->flush_wpq = flush_wpq; 609 atomic_set(&nvdimm->busy, 0); 610 dev = &nvdimm->dev; 611 dev_set_name(dev, "nmem%d", nvdimm->id); 612 dev->parent = &nvdimm_bus->dev; 613 dev->type = &nvdimm_device_type; 614 dev->devt = MKDEV(nvdimm_major, nvdimm->id); 615 dev->groups = groups; 616 nvdimm->sec.ops = sec_ops; 617 nvdimm->fw_ops = fw_ops; 618 nvdimm->sec.overwrite_tmo = 0; 619 INIT_DELAYED_WORK(&nvdimm->dwork, nvdimm_security_overwrite_query); 620 /* 621 * Security state must be initialized before device_add() for 622 * attribute visibility. 623 */ 624 /* get security state and extended (master) state */ 625 nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER); 626 nvdimm->sec.ext_flags = nvdimm_security_flags(nvdimm, NVDIMM_MASTER); 627 device_initialize(dev); 628 lockdep_set_class(&dev->mutex, &nvdimm_key); 629 if (test_bit(NDD_REGISTER_SYNC, &flags)) 630 nd_device_register_sync(dev); 631 else 632 nd_device_register(dev); 633 634 return nvdimm; 635} 636EXPORT_SYMBOL_GPL(__nvdimm_create); 637 638void nvdimm_delete(struct nvdimm *nvdimm) 639{ 640 struct device *dev = &nvdimm->dev; 641 bool dev_put = false; 642 643 /* We are shutting down. Make state frozen artificially. */ 644 nvdimm_bus_lock(dev); 645 set_bit(NVDIMM_SECURITY_FROZEN, &nvdimm->sec.flags); 646 if (test_and_clear_bit(NDD_WORK_PENDING, &nvdimm->flags)) 647 dev_put = true; 648 nvdimm_bus_unlock(dev); 649 cancel_delayed_work_sync(&nvdimm->dwork); 650 if (dev_put) 651 put_device(dev); 652 nd_device_unregister(dev, ND_SYNC); 653} 654EXPORT_SYMBOL_GPL(nvdimm_delete); 655 656static void shutdown_security_notify(void *data) 657{ 658 struct nvdimm *nvdimm = data; 659 660 sysfs_put(nvdimm->sec.overwrite_state); 661} 662 663int nvdimm_security_setup_events(struct device *dev) 664{ 665 struct nvdimm *nvdimm = to_nvdimm(dev); 666 667 if (!nvdimm->sec.flags || !nvdimm->sec.ops 668 || !nvdimm->sec.ops->overwrite) 669 return 0; 670 nvdimm->sec.overwrite_state = sysfs_get_dirent(dev->kobj.sd, "security"); 671 if (!nvdimm->sec.overwrite_state) 672 return -ENOMEM; 673 674 return devm_add_action_or_reset(dev, shutdown_security_notify, nvdimm); 675} 676EXPORT_SYMBOL_GPL(nvdimm_security_setup_events); 677 678int nvdimm_in_overwrite(struct nvdimm *nvdimm) 679{ 680 return test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags); 681} 682EXPORT_SYMBOL_GPL(nvdimm_in_overwrite); 683 684int nvdimm_security_freeze(struct nvdimm *nvdimm) 685{ 686 int rc; 687 688 WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev)); 689 690 if (!nvdimm->sec.ops || !nvdimm->sec.ops->freeze) 691 return -EOPNOTSUPP; 692 693 if (!nvdimm->sec.flags) 694 return -EIO; 695 696 if (test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags)) { 697 dev_warn(&nvdimm->dev, "Overwrite operation in progress.\n"); 698 return -EBUSY; 699 } 700 701 rc = nvdimm->sec.ops->freeze(nvdimm); 702 nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER); 703 704 return rc; 705} 706 707static unsigned long dpa_align(struct nd_region *nd_region) 708{ 709 struct device *dev = &nd_region->dev; 710 711 if (dev_WARN_ONCE(dev, !is_nvdimm_bus_locked(dev), 712 "bus lock required for capacity provision\n")) 713 return 0; 714 if (dev_WARN_ONCE(dev, !nd_region->ndr_mappings || nd_region->align 715 % nd_region->ndr_mappings, 716 "invalid region align %#lx mappings: %d\n", 717 nd_region->align, nd_region->ndr_mappings)) 718 return 0; 719 return nd_region->align / nd_region->ndr_mappings; 720} 721 722/** 723 * nd_pmem_max_contiguous_dpa - For the given dimm+region, return the max 724 * contiguous unallocated dpa range. 725 * @nd_region: constrain available space check to this reference region 726 * @nd_mapping: container of dpa-resource-root + labels 727 * 728 * Returns: %0 if there is an alignment error, otherwise the max 729 * unallocated dpa range 730 */ 731resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region, 732 struct nd_mapping *nd_mapping) 733{ 734 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); 735 struct nvdimm_bus *nvdimm_bus; 736 resource_size_t max = 0; 737 struct resource *res; 738 unsigned long align; 739 740 /* if a dimm is disabled the available capacity is zero */ 741 if (!ndd) 742 return 0; 743 744 align = dpa_align(nd_region); 745 if (!align) 746 return 0; 747 748 nvdimm_bus = walk_to_nvdimm_bus(ndd->dev); 749 if (__reserve_free_pmem(&nd_region->dev, nd_mapping->nvdimm)) 750 return 0; 751 for_each_dpa_resource(ndd, res) { 752 resource_size_t start, end; 753 754 if (strcmp(res->name, "pmem-reserve") != 0) 755 continue; 756 /* trim free space relative to current alignment setting */ 757 start = ALIGN(res->start, align); 758 end = ALIGN_DOWN(res->end + 1, align) - 1; 759 if (end < start) 760 continue; 761 if (end - start + 1 > max) 762 max = end - start + 1; 763 } 764 release_free_pmem(nvdimm_bus, nd_mapping); 765 return max; 766} 767 768/** 769 * nd_pmem_available_dpa - for the given dimm+region account unallocated dpa 770 * @nd_mapping: container of dpa-resource-root + labels 771 * @nd_region: constrain available space check to this reference region 772 * 773 * Validate that a PMEM label, if present, aligns with the start of an 774 * interleave set. 775 * 776 * Returns: %0 if there is an alignment error, otherwise the unallocated dpa 777 */ 778resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region, 779 struct nd_mapping *nd_mapping) 780{ 781 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); 782 resource_size_t map_start, map_end, busy = 0; 783 struct resource *res; 784 unsigned long align; 785 786 if (!ndd) 787 return 0; 788 789 align = dpa_align(nd_region); 790 if (!align) 791 return 0; 792 793 map_start = nd_mapping->start; 794 map_end = map_start + nd_mapping->size - 1; 795 for_each_dpa_resource(ndd, res) { 796 resource_size_t start, end; 797 798 start = ALIGN_DOWN(res->start, align); 799 end = ALIGN(res->end + 1, align) - 1; 800 if (start >= map_start && start < map_end) { 801 if (end > map_end) { 802 nd_dbg_dpa(nd_region, ndd, res, 803 "misaligned to iset\n"); 804 return 0; 805 } 806 busy += end - start + 1; 807 } else if (end >= map_start && end <= map_end) { 808 busy += end - start + 1; 809 } else if (map_start > start && map_start < end) { 810 /* total eclipse of the mapping */ 811 busy += nd_mapping->size; 812 } 813 } 814 815 if (busy < nd_mapping->size) 816 return ALIGN_DOWN(nd_mapping->size - busy, align); 817 return 0; 818} 819 820void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res) 821{ 822 WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev)); 823 kfree(res->name); 824 __release_region(&ndd->dpa, res->start, resource_size(res)); 825} 826 827struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd, 828 struct nd_label_id *label_id, resource_size_t start, 829 resource_size_t n) 830{ 831 char *name = kmemdup(label_id, sizeof(*label_id), GFP_KERNEL); 832 struct resource *res; 833 834 if (!name) 835 return NULL; 836 837 WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev)); 838 res = __request_region(&ndd->dpa, start, n, name, 0); 839 if (!res) 840 kfree(name); 841 return res; 842} 843 844/** 845 * nvdimm_allocated_dpa - sum up the dpa currently allocated to this label_id 846 * @ndd: container of dpa-resource-root + labels 847 * @label_id: dpa resource name of the form pmem-<human readable uuid> 848 * 849 * Returns: sum of the dpa allocated to the label_id 850 */ 851resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd, 852 struct nd_label_id *label_id) 853{ 854 resource_size_t allocated = 0; 855 struct resource *res; 856 857 for_each_dpa_resource(ndd, res) 858 if (strcmp(res->name, label_id->id) == 0) 859 allocated += resource_size(res); 860 861 return allocated; 862} 863 864static int count_dimms(struct device *dev, void *c) 865{ 866 int *count = c; 867 868 if (is_nvdimm(dev)) 869 (*count)++; 870 return 0; 871} 872 873int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count) 874{ 875 int count = 0; 876 /* Flush any possible dimm registration failures */ 877 nd_synchronize(); 878 879 device_for_each_child(&nvdimm_bus->dev, &count, count_dimms); 880 dev_dbg(&nvdimm_bus->dev, "count: %d\n", count); 881 if (count != dimm_count) 882 return -ENXIO; 883 return 0; 884} 885EXPORT_SYMBOL_GPL(nvdimm_bus_check_dimm_count); 886 887void __exit nvdimm_devs_exit(void) 888{ 889 ida_destroy(&dimm_ida); 890} 891