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 /* 22 * Retrieve bus and dimm handle and return if this bus supports 23 * get_config_data commands 24 */ 25 int 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 40 static 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 */ 58 int 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 81 int 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 } 126 127 int 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 } 171 172 void nvdimm_set_labeling(struct device *dev) 173 { 174 struct nvdimm *nvdimm = to_nvdimm(dev); 175 176 set_bit(NDD_LABELING, &nvdimm->flags); 177 } 178 179 void nvdimm_set_locked(struct device *dev) 180 { 181 struct nvdimm *nvdimm = to_nvdimm(dev); 182 183 set_bit(NDD_LOCKED, &nvdimm->flags); 184 } 185 186 void nvdimm_clear_locked(struct device *dev) 187 { 188 struct nvdimm *nvdimm = to_nvdimm(dev); 189 190 clear_bit(NDD_LOCKED, &nvdimm->flags); 191 } 192 193 static 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 } 200 201 struct 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 } 208 EXPORT_SYMBOL_GPL(to_nvdimm); 209 210 struct 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 } 218 EXPORT_SYMBOL(to_ndd); 219 220 void 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 } 236 237 void get_ndd(struct nvdimm_drvdata *ndd) 238 { 239 kref_get(&ndd->kref); 240 } 241 242 void put_ndd(struct nvdimm_drvdata *ndd) 243 { 244 if (ndd) 245 kref_put(&ndd->kref, nvdimm_drvdata_release); 246 } 247 248 const char *nvdimm_name(struct nvdimm *nvdimm) 249 { 250 return dev_name(&nvdimm->dev); 251 } 252 EXPORT_SYMBOL_GPL(nvdimm_name); 253 254 struct kobject *nvdimm_kobj(struct nvdimm *nvdimm) 255 { 256 return &nvdimm->dev.kobj; 257 } 258 EXPORT_SYMBOL_GPL(nvdimm_kobj); 259 260 unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm) 261 { 262 return nvdimm->cmd_mask; 263 } 264 EXPORT_SYMBOL_GPL(nvdimm_cmd_mask); 265 266 void *nvdimm_provider_data(struct nvdimm *nvdimm) 267 { 268 if (nvdimm) 269 return nvdimm->provider_data; 270 return NULL; 271 } 272 EXPORT_SYMBOL_GPL(nvdimm_provider_data); 273 274 static 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 } 288 static DEVICE_ATTR_RO(commands); 289 290 static 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 } 299 static DEVICE_ATTR_RO(flags); 300 301 static 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 } 315 static DEVICE_ATTR_RO(state); 316 317 static 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 } 338 339 static 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 } 350 static DEVICE_ATTR_RO(available_slots); 351 352 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 } 374 375 static 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 } 383 static DEVICE_ATTR_RO(frozen); 384 385 static 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 } 405 static DEVICE_ATTR_RW(security); 406 407 static 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 }; 416 417 static 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 } 441 442 static const struct attribute_group nvdimm_attribute_group = { 443 .attrs = nvdimm_attributes, 444 .is_visible = nvdimm_visible, 445 }; 446 447 static 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 } 474 static DEVICE_ATTR_ADMIN_RO(result); 475 476 static 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 } 499 500 static 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 } 525 static DEVICE_ATTR_ADMIN_RW(activate); 526 527 static struct attribute *nvdimm_firmware_attributes[] = { 528 &dev_attr_activate.attr, 529 &dev_attr_result.attr, 530 NULL, 531 }; 532 533 static 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 } 555 556 static const struct attribute_group nvdimm_firmware_attribute_group = { 557 .name = "firmware", 558 .attrs = nvdimm_firmware_attributes, 559 .is_visible = nvdimm_firmware_visible, 560 }; 561 562 static const struct attribute_group *nvdimm_attribute_groups[] = { 563 &nd_device_attribute_group, 564 &nvdimm_attribute_group, 565 &nvdimm_firmware_attribute_group, 566 NULL, 567 }; 568 569 static const struct device_type nvdimm_device_type = { 570 .name = "nvdimm", 571 .release = nvdimm_release, 572 .groups = nvdimm_attribute_groups, 573 }; 574 575 bool is_nvdimm(struct device *dev) 576 { 577 return dev->type == &nvdimm_device_type; 578 } 579 580 static struct lock_class_key nvdimm_key; 581 582 struct 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 nd_device_register(dev); 628 629 return nvdimm; 630 } 631 EXPORT_SYMBOL_GPL(__nvdimm_create); 632 633 void nvdimm_delete(struct nvdimm *nvdimm) 634 { 635 struct device *dev = &nvdimm->dev; 636 bool dev_put = false; 637 638 /* We are shutting down. Make state frozen artificially. */ 639 nvdimm_bus_lock(dev); 640 set_bit(NVDIMM_SECURITY_FROZEN, &nvdimm->sec.flags); 641 if (test_and_clear_bit(NDD_WORK_PENDING, &nvdimm->flags)) 642 dev_put = true; 643 nvdimm_bus_unlock(dev); 644 cancel_delayed_work_sync(&nvdimm->dwork); 645 if (dev_put) 646 put_device(dev); 647 nd_device_unregister(dev, ND_SYNC); 648 } 649 EXPORT_SYMBOL_GPL(nvdimm_delete); 650 651 static void shutdown_security_notify(void *data) 652 { 653 struct nvdimm *nvdimm = data; 654 655 sysfs_put(nvdimm->sec.overwrite_state); 656 } 657 658 int nvdimm_security_setup_events(struct device *dev) 659 { 660 struct nvdimm *nvdimm = to_nvdimm(dev); 661 662 if (!nvdimm->sec.flags || !nvdimm->sec.ops 663 || !nvdimm->sec.ops->overwrite) 664 return 0; 665 nvdimm->sec.overwrite_state = sysfs_get_dirent(dev->kobj.sd, "security"); 666 if (!nvdimm->sec.overwrite_state) 667 return -ENOMEM; 668 669 return devm_add_action_or_reset(dev, shutdown_security_notify, nvdimm); 670 } 671 EXPORT_SYMBOL_GPL(nvdimm_security_setup_events); 672 673 int nvdimm_in_overwrite(struct nvdimm *nvdimm) 674 { 675 return test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags); 676 } 677 EXPORT_SYMBOL_GPL(nvdimm_in_overwrite); 678 679 int nvdimm_security_freeze(struct nvdimm *nvdimm) 680 { 681 int rc; 682 683 WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev)); 684 685 if (!nvdimm->sec.ops || !nvdimm->sec.ops->freeze) 686 return -EOPNOTSUPP; 687 688 if (!nvdimm->sec.flags) 689 return -EIO; 690 691 if (test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags)) { 692 dev_warn(&nvdimm->dev, "Overwrite operation in progress.\n"); 693 return -EBUSY; 694 } 695 696 rc = nvdimm->sec.ops->freeze(nvdimm); 697 nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER); 698 699 return rc; 700 } 701 702 static unsigned long dpa_align(struct nd_region *nd_region) 703 { 704 struct device *dev = &nd_region->dev; 705 706 if (dev_WARN_ONCE(dev, !is_nvdimm_bus_locked(dev), 707 "bus lock required for capacity provision\n")) 708 return 0; 709 if (dev_WARN_ONCE(dev, !nd_region->ndr_mappings || nd_region->align 710 % nd_region->ndr_mappings, 711 "invalid region align %#lx mappings: %d\n", 712 nd_region->align, nd_region->ndr_mappings)) 713 return 0; 714 return nd_region->align / nd_region->ndr_mappings; 715 } 716 717 /** 718 * nd_pmem_max_contiguous_dpa - For the given dimm+region, return the max 719 * contiguous unallocated dpa range. 720 * @nd_region: constrain available space check to this reference region 721 * @nd_mapping: container of dpa-resource-root + labels 722 */ 723 resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region, 724 struct nd_mapping *nd_mapping) 725 { 726 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); 727 struct nvdimm_bus *nvdimm_bus; 728 resource_size_t max = 0; 729 struct resource *res; 730 unsigned long align; 731 732 /* if a dimm is disabled the available capacity is zero */ 733 if (!ndd) 734 return 0; 735 736 align = dpa_align(nd_region); 737 if (!align) 738 return 0; 739 740 nvdimm_bus = walk_to_nvdimm_bus(ndd->dev); 741 if (__reserve_free_pmem(&nd_region->dev, nd_mapping->nvdimm)) 742 return 0; 743 for_each_dpa_resource(ndd, res) { 744 resource_size_t start, end; 745 746 if (strcmp(res->name, "pmem-reserve") != 0) 747 continue; 748 /* trim free space relative to current alignment setting */ 749 start = ALIGN(res->start, align); 750 end = ALIGN_DOWN(res->end + 1, align) - 1; 751 if (end < start) 752 continue; 753 if (end - start + 1 > max) 754 max = end - start + 1; 755 } 756 release_free_pmem(nvdimm_bus, nd_mapping); 757 return max; 758 } 759 760 /** 761 * nd_pmem_available_dpa - for the given dimm+region account unallocated dpa 762 * @nd_mapping: container of dpa-resource-root + labels 763 * @nd_region: constrain available space check to this reference region 764 * 765 * Validate that a PMEM label, if present, aligns with the start of an 766 * interleave set. 767 */ 768 resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region, 769 struct nd_mapping *nd_mapping) 770 { 771 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping); 772 resource_size_t map_start, map_end, busy = 0; 773 struct resource *res; 774 unsigned long align; 775 776 if (!ndd) 777 return 0; 778 779 align = dpa_align(nd_region); 780 if (!align) 781 return 0; 782 783 map_start = nd_mapping->start; 784 map_end = map_start + nd_mapping->size - 1; 785 for_each_dpa_resource(ndd, res) { 786 resource_size_t start, end; 787 788 start = ALIGN_DOWN(res->start, align); 789 end = ALIGN(res->end + 1, align) - 1; 790 if (start >= map_start && start < map_end) { 791 if (end > map_end) { 792 nd_dbg_dpa(nd_region, ndd, res, 793 "misaligned to iset\n"); 794 return 0; 795 } 796 busy += end - start + 1; 797 } else if (end >= map_start && end <= map_end) { 798 busy += end - start + 1; 799 } else if (map_start > start && map_start < end) { 800 /* total eclipse of the mapping */ 801 busy += nd_mapping->size; 802 } 803 } 804 805 if (busy < nd_mapping->size) 806 return ALIGN_DOWN(nd_mapping->size - busy, align); 807 return 0; 808 } 809 810 void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res) 811 { 812 WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev)); 813 kfree(res->name); 814 __release_region(&ndd->dpa, res->start, resource_size(res)); 815 } 816 817 struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd, 818 struct nd_label_id *label_id, resource_size_t start, 819 resource_size_t n) 820 { 821 char *name = kmemdup(label_id, sizeof(*label_id), GFP_KERNEL); 822 struct resource *res; 823 824 if (!name) 825 return NULL; 826 827 WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev)); 828 res = __request_region(&ndd->dpa, start, n, name, 0); 829 if (!res) 830 kfree(name); 831 return res; 832 } 833 834 /** 835 * nvdimm_allocated_dpa - sum up the dpa currently allocated to this label_id 836 * @nvdimm: container of dpa-resource-root + labels 837 * @label_id: dpa resource name of the form pmem-<human readable uuid> 838 */ 839 resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd, 840 struct nd_label_id *label_id) 841 { 842 resource_size_t allocated = 0; 843 struct resource *res; 844 845 for_each_dpa_resource(ndd, res) 846 if (strcmp(res->name, label_id->id) == 0) 847 allocated += resource_size(res); 848 849 return allocated; 850 } 851 852 static int count_dimms(struct device *dev, void *c) 853 { 854 int *count = c; 855 856 if (is_nvdimm(dev)) 857 (*count)++; 858 return 0; 859 } 860 861 int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count) 862 { 863 int count = 0; 864 /* Flush any possible dimm registration failures */ 865 nd_synchronize(); 866 867 device_for_each_child(&nvdimm_bus->dev, &count, count_dimms); 868 dev_dbg(&nvdimm_bus->dev, "count: %d\n", count); 869 if (count != dimm_count) 870 return -ENXIO; 871 return 0; 872 } 873 EXPORT_SYMBOL_GPL(nvdimm_bus_check_dimm_count); 874 875 void __exit nvdimm_devs_exit(void) 876 { 877 ida_destroy(&dimm_ida); 878 } 879