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