1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2007-2010 Red Hat, Inc. 4 * by Peter Jones <pjones@redhat.com> 5 * Copyright 2008 IBM, Inc. 6 * by Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 7 * Copyright 2008 8 * by Konrad Rzeszutek <ketuzsezr@darnok.org> 9 * 10 * This code exposes the iSCSI Boot Format Table to userland via sysfs. 11 * 12 * Changelog: 13 * 14 * 06 Jan 2010 - Peter Jones <pjones@redhat.com> 15 * New changelog entries are in the git log from now on. Not here. 16 * 17 * 14 Mar 2008 - Konrad Rzeszutek <ketuzsezr@darnok.org> 18 * Updated comments and copyrights. (v0.4.9) 19 * 20 * 11 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 21 * Converted to using ibft_addr. (v0.4.8) 22 * 23 * 8 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 24 * Combined two functions in one: reserve_ibft_region. (v0.4.7) 25 * 26 * 30 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 27 * Added logic to handle IPv6 addresses. (v0.4.6) 28 * 29 * 25 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 30 * Added logic to handle badly not-to-spec iBFT. (v0.4.5) 31 * 32 * 4 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 33 * Added __init to function declarations. (v0.4.4) 34 * 35 * 21 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 36 * Updated kobject registration, combined unregister functions in one 37 * and code and style cleanup. (v0.4.3) 38 * 39 * 5 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 40 * Added end-markers to enums and re-organized kobject registration. (v0.4.2) 41 * 42 * 4 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 43 * Created 'device' sysfs link to the NIC and style cleanup. (v0.4.1) 44 * 45 * 28 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 46 * Added sysfs-ibft documentation, moved 'find_ibft' function to 47 * in its own file and added text attributes for every struct field. (v0.4) 48 * 49 * 21 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 50 * Added text attributes emulating OpenFirmware /proc/device-tree naming. 51 * Removed binary /sysfs interface (v0.3) 52 * 53 * 29 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 54 * Added functionality in setup.c to reserve iBFT region. (v0.2) 55 * 56 * 27 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 57 * First version exposing iBFT data via a binary /sysfs. (v0.1) 58 */ 59 60 61 #include <linux/blkdev.h> 62 #include <linux/capability.h> 63 #include <linux/ctype.h> 64 #include <linux/device.h> 65 #include <linux/err.h> 66 #include <linux/init.h> 67 #include <linux/iscsi_ibft.h> 68 #include <linux/limits.h> 69 #include <linux/module.h> 70 #include <linux/pci.h> 71 #include <linux/slab.h> 72 #include <linux/stat.h> 73 #include <linux/string.h> 74 #include <linux/types.h> 75 #include <linux/acpi.h> 76 #include <linux/iscsi_boot_sysfs.h> 77 78 #define IBFT_ISCSI_VERSION "0.5.0" 79 #define IBFT_ISCSI_DATE "2010-Feb-25" 80 81 MODULE_AUTHOR("Peter Jones <pjones@redhat.com> and " 82 "Konrad Rzeszutek <ketuzsezr@darnok.org>"); 83 MODULE_DESCRIPTION("sysfs interface to BIOS iBFT information"); 84 MODULE_LICENSE("GPL"); 85 MODULE_VERSION(IBFT_ISCSI_VERSION); 86 87 #ifndef CONFIG_ISCSI_IBFT_FIND 88 struct acpi_table_ibft *ibft_addr; 89 #endif 90 91 struct ibft_hdr { 92 u8 id; 93 u8 version; 94 u16 length; 95 u8 index; 96 u8 flags; 97 } __attribute__((__packed__)); 98 99 struct ibft_control { 100 struct ibft_hdr hdr; 101 u16 extensions; 102 u16 initiator_off; 103 u16 nic0_off; 104 u16 tgt0_off; 105 u16 nic1_off; 106 u16 tgt1_off; 107 u16 expansion[]; 108 } __attribute__((__packed__)); 109 110 struct ibft_initiator { 111 struct ibft_hdr hdr; 112 char isns_server[16]; 113 char slp_server[16]; 114 char pri_radius_server[16]; 115 char sec_radius_server[16]; 116 u16 initiator_name_len; 117 u16 initiator_name_off; 118 } __attribute__((__packed__)); 119 120 struct ibft_nic { 121 struct ibft_hdr hdr; 122 char ip_addr[16]; 123 u8 subnet_mask_prefix; 124 u8 origin; 125 char gateway[16]; 126 char primary_dns[16]; 127 char secondary_dns[16]; 128 char dhcp[16]; 129 u16 vlan; 130 char mac[6]; 131 u16 pci_bdf; 132 u16 hostname_len; 133 u16 hostname_off; 134 } __attribute__((__packed__)); 135 136 struct ibft_tgt { 137 struct ibft_hdr hdr; 138 char ip_addr[16]; 139 u16 port; 140 char lun[8]; 141 u8 chap_type; 142 u8 nic_assoc; 143 u16 tgt_name_len; 144 u16 tgt_name_off; 145 u16 chap_name_len; 146 u16 chap_name_off; 147 u16 chap_secret_len; 148 u16 chap_secret_off; 149 u16 rev_chap_name_len; 150 u16 rev_chap_name_off; 151 u16 rev_chap_secret_len; 152 u16 rev_chap_secret_off; 153 } __attribute__((__packed__)); 154 155 /* 156 * The kobject different types and its names. 157 * 158 */ 159 enum ibft_id { 160 id_reserved = 0, /* We don't support. */ 161 id_control = 1, /* Should show up only once and is not exported. */ 162 id_initiator = 2, 163 id_nic = 3, 164 id_target = 4, 165 id_extensions = 5, /* We don't support. */ 166 id_end_marker, 167 }; 168 169 /* 170 * The kobject and attribute structures. 171 */ 172 173 struct ibft_kobject { 174 struct acpi_table_ibft *header; 175 union { 176 struct ibft_initiator *initiator; 177 struct ibft_nic *nic; 178 struct ibft_tgt *tgt; 179 struct ibft_hdr *hdr; 180 }; 181 }; 182 183 static struct iscsi_boot_kset *boot_kset; 184 185 /* fully null address */ 186 static const char nulls[16]; 187 188 /* IPv4-mapped IPv6 ::ffff:0.0.0.0 */ 189 static const char mapped_nulls[16] = { 0x00, 0x00, 0x00, 0x00, 190 0x00, 0x00, 0x00, 0x00, 191 0x00, 0x00, 0xff, 0xff, 192 0x00, 0x00, 0x00, 0x00 }; 193 194 static int address_not_null(u8 *ip) 195 { 196 return (memcmp(ip, nulls, 16) && memcmp(ip, mapped_nulls, 16)); 197 } 198 199 /* 200 * Helper functions to parse data properly. 201 */ 202 static ssize_t sprintf_ipaddr(char *buf, u8 *ip) 203 { 204 char *str = buf; 205 206 if (ip[0] == 0 && ip[1] == 0 && ip[2] == 0 && ip[3] == 0 && 207 ip[4] == 0 && ip[5] == 0 && ip[6] == 0 && ip[7] == 0 && 208 ip[8] == 0 && ip[9] == 0 && ip[10] == 0xff && ip[11] == 0xff) { 209 /* 210 * IPV4 211 */ 212 str += sprintf(buf, "%pI4", ip + 12); 213 } else { 214 /* 215 * IPv6 216 */ 217 str += sprintf(str, "%pI6", ip); 218 } 219 str += sprintf(str, "\n"); 220 return str - buf; 221 } 222 223 static ssize_t sprintf_string(char *str, int len, char *buf) 224 { 225 return sprintf(str, "%.*s\n", len, buf); 226 } 227 228 /* 229 * Helper function to verify the IBFT header. 230 */ 231 static int ibft_verify_hdr(char *t, struct ibft_hdr *hdr, int id, int length) 232 { 233 if (hdr->id != id) { 234 printk(KERN_ERR "iBFT error: We expected the %s " \ 235 "field header.id to have %d but " \ 236 "found %d instead!\n", t, id, hdr->id); 237 return -ENODEV; 238 } 239 if (length && hdr->length != length) { 240 printk(KERN_ERR "iBFT error: We expected the %s " \ 241 "field header.length to have %d but " \ 242 "found %d instead!\n", t, length, hdr->length); 243 return -ENODEV; 244 } 245 246 return 0; 247 } 248 249 /* 250 * Routines for parsing the iBFT data to be human readable. 251 */ 252 static ssize_t ibft_attr_show_initiator(void *data, int type, char *buf) 253 { 254 struct ibft_kobject *entry = data; 255 struct ibft_initiator *initiator = entry->initiator; 256 void *ibft_loc = entry->header; 257 char *str = buf; 258 259 if (!initiator) 260 return 0; 261 262 switch (type) { 263 case ISCSI_BOOT_INI_INDEX: 264 str += sprintf(str, "%d\n", initiator->hdr.index); 265 break; 266 case ISCSI_BOOT_INI_FLAGS: 267 str += sprintf(str, "%d\n", initiator->hdr.flags); 268 break; 269 case ISCSI_BOOT_INI_ISNS_SERVER: 270 str += sprintf_ipaddr(str, initiator->isns_server); 271 break; 272 case ISCSI_BOOT_INI_SLP_SERVER: 273 str += sprintf_ipaddr(str, initiator->slp_server); 274 break; 275 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER: 276 str += sprintf_ipaddr(str, initiator->pri_radius_server); 277 break; 278 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER: 279 str += sprintf_ipaddr(str, initiator->sec_radius_server); 280 break; 281 case ISCSI_BOOT_INI_INITIATOR_NAME: 282 str += sprintf_string(str, initiator->initiator_name_len, 283 (char *)ibft_loc + 284 initiator->initiator_name_off); 285 break; 286 default: 287 break; 288 } 289 290 return str - buf; 291 } 292 293 static ssize_t ibft_attr_show_nic(void *data, int type, char *buf) 294 { 295 struct ibft_kobject *entry = data; 296 struct ibft_nic *nic = entry->nic; 297 void *ibft_loc = entry->header; 298 char *str = buf; 299 __be32 val; 300 301 if (!nic) 302 return 0; 303 304 switch (type) { 305 case ISCSI_BOOT_ETH_INDEX: 306 str += sprintf(str, "%d\n", nic->hdr.index); 307 break; 308 case ISCSI_BOOT_ETH_FLAGS: 309 str += sprintf(str, "%d\n", nic->hdr.flags); 310 break; 311 case ISCSI_BOOT_ETH_IP_ADDR: 312 str += sprintf_ipaddr(str, nic->ip_addr); 313 break; 314 case ISCSI_BOOT_ETH_SUBNET_MASK: 315 val = cpu_to_be32(~((1 << (32-nic->subnet_mask_prefix))-1)); 316 str += sprintf(str, "%pI4", &val); 317 break; 318 case ISCSI_BOOT_ETH_PREFIX_LEN: 319 str += sprintf(str, "%d\n", nic->subnet_mask_prefix); 320 break; 321 case ISCSI_BOOT_ETH_ORIGIN: 322 str += sprintf(str, "%d\n", nic->origin); 323 break; 324 case ISCSI_BOOT_ETH_GATEWAY: 325 str += sprintf_ipaddr(str, nic->gateway); 326 break; 327 case ISCSI_BOOT_ETH_PRIMARY_DNS: 328 str += sprintf_ipaddr(str, nic->primary_dns); 329 break; 330 case ISCSI_BOOT_ETH_SECONDARY_DNS: 331 str += sprintf_ipaddr(str, nic->secondary_dns); 332 break; 333 case ISCSI_BOOT_ETH_DHCP: 334 str += sprintf_ipaddr(str, nic->dhcp); 335 break; 336 case ISCSI_BOOT_ETH_VLAN: 337 str += sprintf(str, "%d\n", nic->vlan); 338 break; 339 case ISCSI_BOOT_ETH_MAC: 340 str += sprintf(str, "%pM\n", nic->mac); 341 break; 342 case ISCSI_BOOT_ETH_HOSTNAME: 343 str += sprintf_string(str, nic->hostname_len, 344 (char *)ibft_loc + nic->hostname_off); 345 break; 346 default: 347 break; 348 } 349 350 return str - buf; 351 }; 352 353 static ssize_t ibft_attr_show_target(void *data, int type, char *buf) 354 { 355 struct ibft_kobject *entry = data; 356 struct ibft_tgt *tgt = entry->tgt; 357 void *ibft_loc = entry->header; 358 char *str = buf; 359 int i; 360 361 if (!tgt) 362 return 0; 363 364 switch (type) { 365 case ISCSI_BOOT_TGT_INDEX: 366 str += sprintf(str, "%d\n", tgt->hdr.index); 367 break; 368 case ISCSI_BOOT_TGT_FLAGS: 369 str += sprintf(str, "%d\n", tgt->hdr.flags); 370 break; 371 case ISCSI_BOOT_TGT_IP_ADDR: 372 str += sprintf_ipaddr(str, tgt->ip_addr); 373 break; 374 case ISCSI_BOOT_TGT_PORT: 375 str += sprintf(str, "%d\n", tgt->port); 376 break; 377 case ISCSI_BOOT_TGT_LUN: 378 for (i = 0; i < 8; i++) 379 str += sprintf(str, "%x", (u8)tgt->lun[i]); 380 str += sprintf(str, "\n"); 381 break; 382 case ISCSI_BOOT_TGT_NIC_ASSOC: 383 str += sprintf(str, "%d\n", tgt->nic_assoc); 384 break; 385 case ISCSI_BOOT_TGT_CHAP_TYPE: 386 str += sprintf(str, "%d\n", tgt->chap_type); 387 break; 388 case ISCSI_BOOT_TGT_NAME: 389 str += sprintf_string(str, tgt->tgt_name_len, 390 (char *)ibft_loc + tgt->tgt_name_off); 391 break; 392 case ISCSI_BOOT_TGT_CHAP_NAME: 393 str += sprintf_string(str, tgt->chap_name_len, 394 (char *)ibft_loc + tgt->chap_name_off); 395 break; 396 case ISCSI_BOOT_TGT_CHAP_SECRET: 397 str += sprintf_string(str, tgt->chap_secret_len, 398 (char *)ibft_loc + tgt->chap_secret_off); 399 break; 400 case ISCSI_BOOT_TGT_REV_CHAP_NAME: 401 str += sprintf_string(str, tgt->rev_chap_name_len, 402 (char *)ibft_loc + 403 tgt->rev_chap_name_off); 404 break; 405 case ISCSI_BOOT_TGT_REV_CHAP_SECRET: 406 str += sprintf_string(str, tgt->rev_chap_secret_len, 407 (char *)ibft_loc + 408 tgt->rev_chap_secret_off); 409 break; 410 default: 411 break; 412 } 413 414 return str - buf; 415 } 416 417 static ssize_t ibft_attr_show_acpitbl(void *data, int type, char *buf) 418 { 419 struct ibft_kobject *entry = data; 420 char *str = buf; 421 422 switch (type) { 423 case ISCSI_BOOT_ACPITBL_SIGNATURE: 424 str += sprintf_string(str, ACPI_NAMESEG_SIZE, 425 entry->header->header.signature); 426 break; 427 case ISCSI_BOOT_ACPITBL_OEM_ID: 428 str += sprintf_string(str, ACPI_OEM_ID_SIZE, 429 entry->header->header.oem_id); 430 break; 431 case ISCSI_BOOT_ACPITBL_OEM_TABLE_ID: 432 str += sprintf_string(str, ACPI_OEM_TABLE_ID_SIZE, 433 entry->header->header.oem_table_id); 434 break; 435 default: 436 break; 437 } 438 439 return str - buf; 440 } 441 442 static int __init ibft_check_device(void) 443 { 444 int len; 445 u8 *pos; 446 u8 csum = 0; 447 448 len = ibft_addr->header.length; 449 450 /* Sanity checking of iBFT. */ 451 if (ibft_addr->header.revision != 1) { 452 printk(KERN_ERR "iBFT module supports only revision 1, " \ 453 "while this is %d.\n", 454 ibft_addr->header.revision); 455 return -ENOENT; 456 } 457 for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++) 458 csum += *pos; 459 460 if (csum) { 461 printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum); 462 return -ENOENT; 463 } 464 465 return 0; 466 } 467 468 /* 469 * Helper routiners to check to determine if the entry is valid 470 * in the proper iBFT structure. 471 */ 472 static umode_t ibft_check_nic_for(void *data, int type) 473 { 474 struct ibft_kobject *entry = data; 475 struct ibft_nic *nic = entry->nic; 476 umode_t rc = 0; 477 478 switch (type) { 479 case ISCSI_BOOT_ETH_INDEX: 480 case ISCSI_BOOT_ETH_FLAGS: 481 rc = S_IRUGO; 482 break; 483 case ISCSI_BOOT_ETH_IP_ADDR: 484 if (address_not_null(nic->ip_addr)) 485 rc = S_IRUGO; 486 break; 487 case ISCSI_BOOT_ETH_PREFIX_LEN: 488 case ISCSI_BOOT_ETH_SUBNET_MASK: 489 if (nic->subnet_mask_prefix) 490 rc = S_IRUGO; 491 break; 492 case ISCSI_BOOT_ETH_ORIGIN: 493 rc = S_IRUGO; 494 break; 495 case ISCSI_BOOT_ETH_GATEWAY: 496 if (address_not_null(nic->gateway)) 497 rc = S_IRUGO; 498 break; 499 case ISCSI_BOOT_ETH_PRIMARY_DNS: 500 if (address_not_null(nic->primary_dns)) 501 rc = S_IRUGO; 502 break; 503 case ISCSI_BOOT_ETH_SECONDARY_DNS: 504 if (address_not_null(nic->secondary_dns)) 505 rc = S_IRUGO; 506 break; 507 case ISCSI_BOOT_ETH_DHCP: 508 if (address_not_null(nic->dhcp)) 509 rc = S_IRUGO; 510 break; 511 case ISCSI_BOOT_ETH_VLAN: 512 case ISCSI_BOOT_ETH_MAC: 513 rc = S_IRUGO; 514 break; 515 case ISCSI_BOOT_ETH_HOSTNAME: 516 if (nic->hostname_off) 517 rc = S_IRUGO; 518 break; 519 default: 520 break; 521 } 522 523 return rc; 524 } 525 526 static umode_t __init ibft_check_tgt_for(void *data, int type) 527 { 528 struct ibft_kobject *entry = data; 529 struct ibft_tgt *tgt = entry->tgt; 530 umode_t rc = 0; 531 532 switch (type) { 533 case ISCSI_BOOT_TGT_INDEX: 534 case ISCSI_BOOT_TGT_FLAGS: 535 case ISCSI_BOOT_TGT_IP_ADDR: 536 case ISCSI_BOOT_TGT_PORT: 537 case ISCSI_BOOT_TGT_LUN: 538 case ISCSI_BOOT_TGT_NIC_ASSOC: 539 case ISCSI_BOOT_TGT_CHAP_TYPE: 540 rc = S_IRUGO; 541 break; 542 case ISCSI_BOOT_TGT_NAME: 543 if (tgt->tgt_name_len) 544 rc = S_IRUGO; 545 break; 546 case ISCSI_BOOT_TGT_CHAP_NAME: 547 case ISCSI_BOOT_TGT_CHAP_SECRET: 548 if (tgt->chap_name_len) 549 rc = S_IRUGO; 550 break; 551 case ISCSI_BOOT_TGT_REV_CHAP_NAME: 552 case ISCSI_BOOT_TGT_REV_CHAP_SECRET: 553 if (tgt->rev_chap_name_len) 554 rc = S_IRUGO; 555 break; 556 default: 557 break; 558 } 559 560 return rc; 561 } 562 563 static umode_t __init ibft_check_initiator_for(void *data, int type) 564 { 565 struct ibft_kobject *entry = data; 566 struct ibft_initiator *init = entry->initiator; 567 umode_t rc = 0; 568 569 switch (type) { 570 case ISCSI_BOOT_INI_INDEX: 571 case ISCSI_BOOT_INI_FLAGS: 572 rc = S_IRUGO; 573 break; 574 case ISCSI_BOOT_INI_ISNS_SERVER: 575 if (address_not_null(init->isns_server)) 576 rc = S_IRUGO; 577 break; 578 case ISCSI_BOOT_INI_SLP_SERVER: 579 if (address_not_null(init->slp_server)) 580 rc = S_IRUGO; 581 break; 582 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER: 583 if (address_not_null(init->pri_radius_server)) 584 rc = S_IRUGO; 585 break; 586 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER: 587 if (address_not_null(init->sec_radius_server)) 588 rc = S_IRUGO; 589 break; 590 case ISCSI_BOOT_INI_INITIATOR_NAME: 591 if (init->initiator_name_len) 592 rc = S_IRUGO; 593 break; 594 default: 595 break; 596 } 597 598 return rc; 599 } 600 601 static umode_t __init ibft_check_acpitbl_for(void *data, int type) 602 { 603 604 umode_t rc = 0; 605 606 switch (type) { 607 case ISCSI_BOOT_ACPITBL_SIGNATURE: 608 case ISCSI_BOOT_ACPITBL_OEM_ID: 609 case ISCSI_BOOT_ACPITBL_OEM_TABLE_ID: 610 rc = S_IRUGO; 611 break; 612 default: 613 break; 614 } 615 616 return rc; 617 } 618 619 static void ibft_kobj_release(void *data) 620 { 621 kfree(data); 622 } 623 624 /* 625 * Helper function for ibft_register_kobjects. 626 */ 627 static int __init ibft_create_kobject(struct acpi_table_ibft *header, 628 struct ibft_hdr *hdr) 629 { 630 struct iscsi_boot_kobj *boot_kobj = NULL; 631 struct ibft_kobject *ibft_kobj = NULL; 632 struct ibft_nic *nic = (struct ibft_nic *)hdr; 633 struct pci_dev *pci_dev; 634 int rc = 0; 635 636 ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL); 637 if (!ibft_kobj) 638 return -ENOMEM; 639 640 ibft_kobj->header = header; 641 ibft_kobj->hdr = hdr; 642 643 switch (hdr->id) { 644 case id_initiator: 645 rc = ibft_verify_hdr("initiator", hdr, id_initiator, 646 sizeof(*ibft_kobj->initiator)); 647 if (rc) 648 break; 649 650 boot_kobj = iscsi_boot_create_initiator(boot_kset, hdr->index, 651 ibft_kobj, 652 ibft_attr_show_initiator, 653 ibft_check_initiator_for, 654 ibft_kobj_release); 655 if (!boot_kobj) { 656 rc = -ENOMEM; 657 goto free_ibft_obj; 658 } 659 break; 660 case id_nic: 661 rc = ibft_verify_hdr("ethernet", hdr, id_nic, 662 sizeof(*ibft_kobj->nic)); 663 if (rc) 664 break; 665 666 boot_kobj = iscsi_boot_create_ethernet(boot_kset, hdr->index, 667 ibft_kobj, 668 ibft_attr_show_nic, 669 ibft_check_nic_for, 670 ibft_kobj_release); 671 if (!boot_kobj) { 672 rc = -ENOMEM; 673 goto free_ibft_obj; 674 } 675 break; 676 case id_target: 677 rc = ibft_verify_hdr("target", hdr, id_target, 678 sizeof(*ibft_kobj->tgt)); 679 if (rc) 680 break; 681 682 boot_kobj = iscsi_boot_create_target(boot_kset, hdr->index, 683 ibft_kobj, 684 ibft_attr_show_target, 685 ibft_check_tgt_for, 686 ibft_kobj_release); 687 if (!boot_kobj) { 688 rc = -ENOMEM; 689 goto free_ibft_obj; 690 } 691 break; 692 case id_reserved: 693 case id_control: 694 case id_extensions: 695 /* Fields which we don't support. Ignore them */ 696 rc = 1; 697 break; 698 default: 699 printk(KERN_ERR "iBFT has unknown structure type (%d). " \ 700 "Report this bug to %.6s!\n", hdr->id, 701 header->header.oem_id); 702 rc = 1; 703 break; 704 } 705 706 if (rc) { 707 /* Skip adding this kobject, but exit with non-fatal error. */ 708 rc = 0; 709 goto free_ibft_obj; 710 } 711 712 if (hdr->id == id_nic) { 713 /* 714 * We don't search for the device in other domains than 715 * zero. This is because on x86 platforms the BIOS 716 * executes only devices which are in domain 0. Furthermore, the 717 * iBFT spec doesn't have a domain id field :-( 718 */ 719 pci_dev = pci_get_domain_bus_and_slot(0, 720 (nic->pci_bdf & 0xff00) >> 8, 721 (nic->pci_bdf & 0xff)); 722 if (pci_dev) { 723 rc = sysfs_create_link(&boot_kobj->kobj, 724 &pci_dev->dev.kobj, "device"); 725 pci_dev_put(pci_dev); 726 } 727 } 728 return 0; 729 730 free_ibft_obj: 731 kfree(ibft_kobj); 732 return rc; 733 } 734 735 /* 736 * Scan the IBFT table structure for the NIC and Target fields. When 737 * found add them on the passed-in list. We do not support the other 738 * fields at this point, so they are skipped. 739 */ 740 static int __init ibft_register_kobjects(struct acpi_table_ibft *header) 741 { 742 struct ibft_control *control = NULL; 743 struct iscsi_boot_kobj *boot_kobj; 744 struct ibft_kobject *ibft_kobj; 745 void *ptr, *end; 746 int rc = 0; 747 u16 offset; 748 u16 eot_offset; 749 750 control = (void *)header + sizeof(*header); 751 end = (void *)control + control->hdr.length; 752 eot_offset = (void *)header + header->header.length - (void *)control; 753 rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control, 0); 754 755 /* iBFT table safety checking */ 756 rc |= ((control->hdr.index) ? -ENODEV : 0); 757 rc |= ((control->hdr.length < sizeof(*control)) ? -ENODEV : 0); 758 if (rc) { 759 printk(KERN_ERR "iBFT error: Control header is invalid!\n"); 760 return rc; 761 } 762 for (ptr = &control->initiator_off; ptr + sizeof(u16) <= end; ptr += sizeof(u16)) { 763 offset = *(u16 *)ptr; 764 if (offset && offset < header->header.length && 765 offset < eot_offset) { 766 rc = ibft_create_kobject(header, 767 (void *)header + offset); 768 if (rc) 769 break; 770 } 771 } 772 if (rc) 773 return rc; 774 775 ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL); 776 if (!ibft_kobj) 777 return -ENOMEM; 778 779 ibft_kobj->header = header; 780 ibft_kobj->hdr = NULL; /*for ibft_unregister*/ 781 782 boot_kobj = iscsi_boot_create_acpitbl(boot_kset, 0, 783 ibft_kobj, 784 ibft_attr_show_acpitbl, 785 ibft_check_acpitbl_for, 786 ibft_kobj_release); 787 if (!boot_kobj) { 788 kfree(ibft_kobj); 789 rc = -ENOMEM; 790 } 791 792 return rc; 793 } 794 795 static void ibft_unregister(void) 796 { 797 struct iscsi_boot_kobj *boot_kobj, *tmp_kobj; 798 struct ibft_kobject *ibft_kobj; 799 800 list_for_each_entry_safe(boot_kobj, tmp_kobj, 801 &boot_kset->kobj_list, list) { 802 ibft_kobj = boot_kobj->data; 803 if (ibft_kobj->hdr && ibft_kobj->hdr->id == id_nic) 804 sysfs_remove_link(&boot_kobj->kobj, "device"); 805 }; 806 } 807 808 static void ibft_cleanup(void) 809 { 810 if (boot_kset) { 811 ibft_unregister(); 812 iscsi_boot_destroy_kset(boot_kset); 813 } 814 } 815 816 static void __exit ibft_exit(void) 817 { 818 ibft_cleanup(); 819 } 820 821 #ifdef CONFIG_ACPI 822 static const struct { 823 char *sign; 824 } ibft_signs[] = { 825 /* 826 * One spec says "IBFT", the other says "iBFT". We have to check 827 * for both. 828 */ 829 { ACPI_SIG_IBFT }, 830 { "iBFT" }, 831 { "BIFT" }, /* Broadcom iSCSI Offload */ 832 }; 833 834 static void __init acpi_find_ibft_region(void) 835 { 836 int i; 837 struct acpi_table_header *table = NULL; 838 839 if (acpi_disabled) 840 return; 841 842 for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) { 843 acpi_get_table(ibft_signs[i].sign, 0, &table); 844 ibft_addr = (struct acpi_table_ibft *)table; 845 } 846 } 847 #else 848 static void __init acpi_find_ibft_region(void) 849 { 850 } 851 #endif 852 853 /* 854 * ibft_init() - creates sysfs tree entries for the iBFT data. 855 */ 856 static int __init ibft_init(void) 857 { 858 int rc = 0; 859 860 /* 861 As on UEFI systems the setup_arch()/find_ibft_region() 862 is called before ACPI tables are parsed and it only does 863 legacy finding. 864 */ 865 if (!ibft_addr) 866 acpi_find_ibft_region(); 867 868 if (ibft_addr) { 869 pr_info("iBFT detected.\n"); 870 871 rc = ibft_check_device(); 872 if (rc) 873 return rc; 874 875 boot_kset = iscsi_boot_create_kset("ibft"); 876 if (!boot_kset) 877 return -ENOMEM; 878 879 /* Scan the IBFT for data and register the kobjects. */ 880 rc = ibft_register_kobjects(ibft_addr); 881 if (rc) 882 goto out_free; 883 } else 884 printk(KERN_INFO "No iBFT detected.\n"); 885 886 return 0; 887 888 out_free: 889 ibft_cleanup(); 890 return rc; 891 } 892 893 module_init(ibft_init); 894 module_exit(ibft_exit); 895