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 static struct acpi_table_ibft *ibft_addr; 88 89 struct ibft_hdr { 90 u8 id; 91 u8 version; 92 u16 length; 93 u8 index; 94 u8 flags; 95 } __attribute__((__packed__)); 96 97 struct ibft_control { 98 struct ibft_hdr hdr; 99 u16 extensions; 100 u16 initiator_off; 101 u16 nic0_off; 102 u16 tgt0_off; 103 u16 nic1_off; 104 u16 tgt1_off; 105 u16 expansion[]; 106 } __attribute__((__packed__)); 107 108 struct ibft_initiator { 109 struct ibft_hdr hdr; 110 char isns_server[16]; 111 char slp_server[16]; 112 char pri_radius_server[16]; 113 char sec_radius_server[16]; 114 u16 initiator_name_len; 115 u16 initiator_name_off; 116 } __attribute__((__packed__)); 117 118 struct ibft_nic { 119 struct ibft_hdr hdr; 120 char ip_addr[16]; 121 u8 subnet_mask_prefix; 122 u8 origin; 123 char gateway[16]; 124 char primary_dns[16]; 125 char secondary_dns[16]; 126 char dhcp[16]; 127 u16 vlan; 128 char mac[6]; 129 u16 pci_bdf; 130 u16 hostname_len; 131 u16 hostname_off; 132 } __attribute__((__packed__)); 133 134 struct ibft_tgt { 135 struct ibft_hdr hdr; 136 char ip_addr[16]; 137 u16 port; 138 char lun[8]; 139 u8 chap_type; 140 u8 nic_assoc; 141 u16 tgt_name_len; 142 u16 tgt_name_off; 143 u16 chap_name_len; 144 u16 chap_name_off; 145 u16 chap_secret_len; 146 u16 chap_secret_off; 147 u16 rev_chap_name_len; 148 u16 rev_chap_name_off; 149 u16 rev_chap_secret_len; 150 u16 rev_chap_secret_off; 151 } __attribute__((__packed__)); 152 153 /* 154 * The kobject different types and its names. 155 * 156 */ 157 enum ibft_id { 158 id_reserved = 0, /* We don't support. */ 159 id_control = 1, /* Should show up only once and is not exported. */ 160 id_initiator = 2, 161 id_nic = 3, 162 id_target = 4, 163 id_extensions = 5, /* We don't support. */ 164 id_end_marker, 165 }; 166 167 /* 168 * The kobject and attribute structures. 169 */ 170 171 struct ibft_kobject { 172 struct acpi_table_ibft *header; 173 union { 174 struct ibft_initiator *initiator; 175 struct ibft_nic *nic; 176 struct ibft_tgt *tgt; 177 struct ibft_hdr *hdr; 178 }; 179 }; 180 181 static struct iscsi_boot_kset *boot_kset; 182 183 /* fully null address */ 184 static const char nulls[16]; 185 186 /* IPv4-mapped IPv6 ::ffff:0.0.0.0 */ 187 static const char mapped_nulls[16] = { 0x00, 0x00, 0x00, 0x00, 188 0x00, 0x00, 0x00, 0x00, 189 0x00, 0x00, 0xff, 0xff, 190 0x00, 0x00, 0x00, 0x00 }; 191 address_not_null(u8 * ip)192 static int address_not_null(u8 *ip) 193 { 194 return (memcmp(ip, nulls, 16) && memcmp(ip, mapped_nulls, 16)); 195 } 196 197 /* 198 * Helper functions to parse data properly. 199 */ sprintf_ipaddr(char * buf,u8 * ip)200 static ssize_t sprintf_ipaddr(char *buf, u8 *ip) 201 { 202 char *str = buf; 203 204 if (ip[0] == 0 && ip[1] == 0 && ip[2] == 0 && ip[3] == 0 && 205 ip[4] == 0 && ip[5] == 0 && ip[6] == 0 && ip[7] == 0 && 206 ip[8] == 0 && ip[9] == 0 && ip[10] == 0xff && ip[11] == 0xff) { 207 /* 208 * IPV4 209 */ 210 str += sprintf(buf, "%pI4", ip + 12); 211 } else { 212 /* 213 * IPv6 214 */ 215 str += sprintf(str, "%pI6", ip); 216 } 217 str += sprintf(str, "\n"); 218 return str - buf; 219 } 220 sprintf_string(char * str,int len,char * buf)221 static ssize_t sprintf_string(char *str, int len, char *buf) 222 { 223 return sprintf(str, "%.*s\n", len, buf); 224 } 225 226 /* 227 * Helper function to verify the IBFT header. 228 */ ibft_verify_hdr(char * t,struct ibft_hdr * hdr,int id,int length)229 static int ibft_verify_hdr(char *t, struct ibft_hdr *hdr, int id, int length) 230 { 231 if (hdr->id != id) { 232 printk(KERN_ERR "iBFT error: We expected the %s " \ 233 "field header.id to have %d but " \ 234 "found %d instead!\n", t, id, hdr->id); 235 return -ENODEV; 236 } 237 if (length && hdr->length != length) { 238 printk(KERN_ERR "iBFT error: We expected the %s " \ 239 "field header.length to have %d but " \ 240 "found %d instead!\n", t, length, hdr->length); 241 return -ENODEV; 242 } 243 244 return 0; 245 } 246 247 /* 248 * Routines for parsing the iBFT data to be human readable. 249 */ ibft_attr_show_initiator(void * data,int type,char * buf)250 static ssize_t ibft_attr_show_initiator(void *data, int type, char *buf) 251 { 252 struct ibft_kobject *entry = data; 253 struct ibft_initiator *initiator = entry->initiator; 254 void *ibft_loc = entry->header; 255 char *str = buf; 256 257 if (!initiator) 258 return 0; 259 260 switch (type) { 261 case ISCSI_BOOT_INI_INDEX: 262 str += sprintf(str, "%d\n", initiator->hdr.index); 263 break; 264 case ISCSI_BOOT_INI_FLAGS: 265 str += sprintf(str, "%d\n", initiator->hdr.flags); 266 break; 267 case ISCSI_BOOT_INI_ISNS_SERVER: 268 str += sprintf_ipaddr(str, initiator->isns_server); 269 break; 270 case ISCSI_BOOT_INI_SLP_SERVER: 271 str += sprintf_ipaddr(str, initiator->slp_server); 272 break; 273 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER: 274 str += sprintf_ipaddr(str, initiator->pri_radius_server); 275 break; 276 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER: 277 str += sprintf_ipaddr(str, initiator->sec_radius_server); 278 break; 279 case ISCSI_BOOT_INI_INITIATOR_NAME: 280 str += sprintf_string(str, initiator->initiator_name_len, 281 (char *)ibft_loc + 282 initiator->initiator_name_off); 283 break; 284 default: 285 break; 286 } 287 288 return str - buf; 289 } 290 ibft_attr_show_nic(void * data,int type,char * buf)291 static ssize_t ibft_attr_show_nic(void *data, int type, char *buf) 292 { 293 struct ibft_kobject *entry = data; 294 struct ibft_nic *nic = entry->nic; 295 void *ibft_loc = entry->header; 296 char *str = buf; 297 __be32 val; 298 299 if (!nic) 300 return 0; 301 302 switch (type) { 303 case ISCSI_BOOT_ETH_INDEX: 304 str += sprintf(str, "%d\n", nic->hdr.index); 305 break; 306 case ISCSI_BOOT_ETH_FLAGS: 307 str += sprintf(str, "%d\n", nic->hdr.flags); 308 break; 309 case ISCSI_BOOT_ETH_IP_ADDR: 310 str += sprintf_ipaddr(str, nic->ip_addr); 311 break; 312 case ISCSI_BOOT_ETH_SUBNET_MASK: 313 if (nic->subnet_mask_prefix > 32) 314 val = cpu_to_be32(~0); 315 else 316 val = cpu_to_be32(~((1 << (32-nic->subnet_mask_prefix))-1)); 317 str += sprintf(str, "%pI4", &val); 318 break; 319 case ISCSI_BOOT_ETH_PREFIX_LEN: 320 str += sprintf(str, "%d\n", nic->subnet_mask_prefix); 321 break; 322 case ISCSI_BOOT_ETH_ORIGIN: 323 str += sprintf(str, "%d\n", nic->origin); 324 break; 325 case ISCSI_BOOT_ETH_GATEWAY: 326 str += sprintf_ipaddr(str, nic->gateway); 327 break; 328 case ISCSI_BOOT_ETH_PRIMARY_DNS: 329 str += sprintf_ipaddr(str, nic->primary_dns); 330 break; 331 case ISCSI_BOOT_ETH_SECONDARY_DNS: 332 str += sprintf_ipaddr(str, nic->secondary_dns); 333 break; 334 case ISCSI_BOOT_ETH_DHCP: 335 str += sprintf_ipaddr(str, nic->dhcp); 336 break; 337 case ISCSI_BOOT_ETH_VLAN: 338 str += sprintf(str, "%d\n", nic->vlan); 339 break; 340 case ISCSI_BOOT_ETH_MAC: 341 str += sprintf(str, "%pM\n", nic->mac); 342 break; 343 case ISCSI_BOOT_ETH_HOSTNAME: 344 str += sprintf_string(str, nic->hostname_len, 345 (char *)ibft_loc + nic->hostname_off); 346 break; 347 default: 348 break; 349 } 350 351 return str - buf; 352 }; 353 ibft_attr_show_target(void * data,int type,char * buf)354 static ssize_t ibft_attr_show_target(void *data, int type, char *buf) 355 { 356 struct ibft_kobject *entry = data; 357 struct ibft_tgt *tgt = entry->tgt; 358 void *ibft_loc = entry->header; 359 char *str = buf; 360 int i; 361 362 if (!tgt) 363 return 0; 364 365 switch (type) { 366 case ISCSI_BOOT_TGT_INDEX: 367 str += sprintf(str, "%d\n", tgt->hdr.index); 368 break; 369 case ISCSI_BOOT_TGT_FLAGS: 370 str += sprintf(str, "%d\n", tgt->hdr.flags); 371 break; 372 case ISCSI_BOOT_TGT_IP_ADDR: 373 str += sprintf_ipaddr(str, tgt->ip_addr); 374 break; 375 case ISCSI_BOOT_TGT_PORT: 376 str += sprintf(str, "%d\n", tgt->port); 377 break; 378 case ISCSI_BOOT_TGT_LUN: 379 for (i = 0; i < 8; i++) 380 str += sprintf(str, "%x", (u8)tgt->lun[i]); 381 str += sprintf(str, "\n"); 382 break; 383 case ISCSI_BOOT_TGT_NIC_ASSOC: 384 str += sprintf(str, "%d\n", tgt->nic_assoc); 385 break; 386 case ISCSI_BOOT_TGT_CHAP_TYPE: 387 str += sprintf(str, "%d\n", tgt->chap_type); 388 break; 389 case ISCSI_BOOT_TGT_NAME: 390 str += sprintf_string(str, tgt->tgt_name_len, 391 (char *)ibft_loc + tgt->tgt_name_off); 392 break; 393 case ISCSI_BOOT_TGT_CHAP_NAME: 394 str += sprintf_string(str, tgt->chap_name_len, 395 (char *)ibft_loc + tgt->chap_name_off); 396 break; 397 case ISCSI_BOOT_TGT_CHAP_SECRET: 398 str += sprintf_string(str, tgt->chap_secret_len, 399 (char *)ibft_loc + tgt->chap_secret_off); 400 break; 401 case ISCSI_BOOT_TGT_REV_CHAP_NAME: 402 str += sprintf_string(str, tgt->rev_chap_name_len, 403 (char *)ibft_loc + 404 tgt->rev_chap_name_off); 405 break; 406 case ISCSI_BOOT_TGT_REV_CHAP_SECRET: 407 str += sprintf_string(str, tgt->rev_chap_secret_len, 408 (char *)ibft_loc + 409 tgt->rev_chap_secret_off); 410 break; 411 default: 412 break; 413 } 414 415 return str - buf; 416 } 417 ibft_attr_show_acpitbl(void * data,int type,char * buf)418 static ssize_t ibft_attr_show_acpitbl(void *data, int type, char *buf) 419 { 420 struct ibft_kobject *entry = data; 421 char *str = buf; 422 423 switch (type) { 424 case ISCSI_BOOT_ACPITBL_SIGNATURE: 425 str += sprintf_string(str, ACPI_NAMESEG_SIZE, 426 entry->header->header.signature); 427 break; 428 case ISCSI_BOOT_ACPITBL_OEM_ID: 429 str += sprintf_string(str, ACPI_OEM_ID_SIZE, 430 entry->header->header.oem_id); 431 break; 432 case ISCSI_BOOT_ACPITBL_OEM_TABLE_ID: 433 str += sprintf_string(str, ACPI_OEM_TABLE_ID_SIZE, 434 entry->header->header.oem_table_id); 435 break; 436 default: 437 break; 438 } 439 440 return str - buf; 441 } 442 ibft_check_device(void)443 static int __init ibft_check_device(void) 444 { 445 int len; 446 u8 *pos; 447 u8 csum = 0; 448 449 len = ibft_addr->header.length; 450 451 /* Sanity checking of iBFT. */ 452 if (ibft_addr->header.revision != 1) { 453 printk(KERN_ERR "iBFT module supports only revision 1, " \ 454 "while this is %d.\n", 455 ibft_addr->header.revision); 456 return -ENOENT; 457 } 458 for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++) 459 csum += *pos; 460 461 if (csum) { 462 printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum); 463 return -ENOENT; 464 } 465 466 return 0; 467 } 468 469 /* 470 * Helper routiners to check to determine if the entry is valid 471 * in the proper iBFT structure. 472 */ ibft_check_nic_for(void * data,int type)473 static umode_t ibft_check_nic_for(void *data, int type) 474 { 475 struct ibft_kobject *entry = data; 476 struct ibft_nic *nic = entry->nic; 477 umode_t rc = 0; 478 479 switch (type) { 480 case ISCSI_BOOT_ETH_INDEX: 481 case ISCSI_BOOT_ETH_FLAGS: 482 rc = S_IRUGO; 483 break; 484 case ISCSI_BOOT_ETH_IP_ADDR: 485 if (address_not_null(nic->ip_addr)) 486 rc = S_IRUGO; 487 break; 488 case ISCSI_BOOT_ETH_PREFIX_LEN: 489 case ISCSI_BOOT_ETH_SUBNET_MASK: 490 if (nic->subnet_mask_prefix) 491 rc = S_IRUGO; 492 break; 493 case ISCSI_BOOT_ETH_ORIGIN: 494 rc = S_IRUGO; 495 break; 496 case ISCSI_BOOT_ETH_GATEWAY: 497 if (address_not_null(nic->gateway)) 498 rc = S_IRUGO; 499 break; 500 case ISCSI_BOOT_ETH_PRIMARY_DNS: 501 if (address_not_null(nic->primary_dns)) 502 rc = S_IRUGO; 503 break; 504 case ISCSI_BOOT_ETH_SECONDARY_DNS: 505 if (address_not_null(nic->secondary_dns)) 506 rc = S_IRUGO; 507 break; 508 case ISCSI_BOOT_ETH_DHCP: 509 if (address_not_null(nic->dhcp)) 510 rc = S_IRUGO; 511 break; 512 case ISCSI_BOOT_ETH_VLAN: 513 case ISCSI_BOOT_ETH_MAC: 514 rc = S_IRUGO; 515 break; 516 case ISCSI_BOOT_ETH_HOSTNAME: 517 if (nic->hostname_off) 518 rc = S_IRUGO; 519 break; 520 default: 521 break; 522 } 523 524 return rc; 525 } 526 ibft_check_tgt_for(void * data,int type)527 static umode_t __init ibft_check_tgt_for(void *data, int type) 528 { 529 struct ibft_kobject *entry = data; 530 struct ibft_tgt *tgt = entry->tgt; 531 umode_t rc = 0; 532 533 switch (type) { 534 case ISCSI_BOOT_TGT_INDEX: 535 case ISCSI_BOOT_TGT_FLAGS: 536 case ISCSI_BOOT_TGT_IP_ADDR: 537 case ISCSI_BOOT_TGT_PORT: 538 case ISCSI_BOOT_TGT_LUN: 539 case ISCSI_BOOT_TGT_NIC_ASSOC: 540 case ISCSI_BOOT_TGT_CHAP_TYPE: 541 rc = S_IRUGO; 542 break; 543 case ISCSI_BOOT_TGT_NAME: 544 if (tgt->tgt_name_len) 545 rc = S_IRUGO; 546 break; 547 case ISCSI_BOOT_TGT_CHAP_NAME: 548 case ISCSI_BOOT_TGT_CHAP_SECRET: 549 if (tgt->chap_name_len) 550 rc = S_IRUGO; 551 break; 552 case ISCSI_BOOT_TGT_REV_CHAP_NAME: 553 case ISCSI_BOOT_TGT_REV_CHAP_SECRET: 554 if (tgt->rev_chap_name_len) 555 rc = S_IRUGO; 556 break; 557 default: 558 break; 559 } 560 561 return rc; 562 } 563 ibft_check_initiator_for(void * data,int type)564 static umode_t __init ibft_check_initiator_for(void *data, int type) 565 { 566 struct ibft_kobject *entry = data; 567 struct ibft_initiator *init = entry->initiator; 568 umode_t rc = 0; 569 570 switch (type) { 571 case ISCSI_BOOT_INI_INDEX: 572 case ISCSI_BOOT_INI_FLAGS: 573 rc = S_IRUGO; 574 break; 575 case ISCSI_BOOT_INI_ISNS_SERVER: 576 if (address_not_null(init->isns_server)) 577 rc = S_IRUGO; 578 break; 579 case ISCSI_BOOT_INI_SLP_SERVER: 580 if (address_not_null(init->slp_server)) 581 rc = S_IRUGO; 582 break; 583 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER: 584 if (address_not_null(init->pri_radius_server)) 585 rc = S_IRUGO; 586 break; 587 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER: 588 if (address_not_null(init->sec_radius_server)) 589 rc = S_IRUGO; 590 break; 591 case ISCSI_BOOT_INI_INITIATOR_NAME: 592 if (init->initiator_name_len) 593 rc = S_IRUGO; 594 break; 595 default: 596 break; 597 } 598 599 return rc; 600 } 601 ibft_check_acpitbl_for(void * data,int type)602 static umode_t __init ibft_check_acpitbl_for(void *data, int type) 603 { 604 605 umode_t rc = 0; 606 607 switch (type) { 608 case ISCSI_BOOT_ACPITBL_SIGNATURE: 609 case ISCSI_BOOT_ACPITBL_OEM_ID: 610 case ISCSI_BOOT_ACPITBL_OEM_TABLE_ID: 611 rc = S_IRUGO; 612 break; 613 default: 614 break; 615 } 616 617 return rc; 618 } 619 ibft_kobj_release(void * data)620 static void ibft_kobj_release(void *data) 621 { 622 kfree(data); 623 } 624 625 /* 626 * Helper function for ibft_register_kobjects. 627 */ ibft_create_kobject(struct acpi_table_ibft * header,struct ibft_hdr * hdr)628 static int __init ibft_create_kobject(struct acpi_table_ibft *header, 629 struct ibft_hdr *hdr) 630 { 631 struct iscsi_boot_kobj *boot_kobj = NULL; 632 struct ibft_kobject *ibft_kobj = NULL; 633 struct ibft_nic *nic = (struct ibft_nic *)hdr; 634 struct pci_dev *pci_dev; 635 int rc = 0; 636 637 ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL); 638 if (!ibft_kobj) 639 return -ENOMEM; 640 641 ibft_kobj->header = header; 642 ibft_kobj->hdr = hdr; 643 644 switch (hdr->id) { 645 case id_initiator: 646 rc = ibft_verify_hdr("initiator", hdr, id_initiator, 647 sizeof(*ibft_kobj->initiator)); 648 if (rc) 649 break; 650 651 boot_kobj = iscsi_boot_create_initiator(boot_kset, hdr->index, 652 ibft_kobj, 653 ibft_attr_show_initiator, 654 ibft_check_initiator_for, 655 ibft_kobj_release); 656 if (!boot_kobj) { 657 rc = -ENOMEM; 658 goto free_ibft_obj; 659 } 660 break; 661 case id_nic: 662 rc = ibft_verify_hdr("ethernet", hdr, id_nic, 663 sizeof(*ibft_kobj->nic)); 664 if (rc) 665 break; 666 667 boot_kobj = iscsi_boot_create_ethernet(boot_kset, hdr->index, 668 ibft_kobj, 669 ibft_attr_show_nic, 670 ibft_check_nic_for, 671 ibft_kobj_release); 672 if (!boot_kobj) { 673 rc = -ENOMEM; 674 goto free_ibft_obj; 675 } 676 break; 677 case id_target: 678 rc = ibft_verify_hdr("target", hdr, id_target, 679 sizeof(*ibft_kobj->tgt)); 680 if (rc) 681 break; 682 683 boot_kobj = iscsi_boot_create_target(boot_kset, hdr->index, 684 ibft_kobj, 685 ibft_attr_show_target, 686 ibft_check_tgt_for, 687 ibft_kobj_release); 688 if (!boot_kobj) { 689 rc = -ENOMEM; 690 goto free_ibft_obj; 691 } 692 break; 693 case id_reserved: 694 case id_control: 695 case id_extensions: 696 /* Fields which we don't support. Ignore them */ 697 rc = 1; 698 break; 699 default: 700 printk(KERN_ERR "iBFT has unknown structure type (%d). " \ 701 "Report this bug to %.6s!\n", hdr->id, 702 header->header.oem_id); 703 rc = 1; 704 break; 705 } 706 707 if (rc) { 708 /* Skip adding this kobject, but exit with non-fatal error. */ 709 rc = 0; 710 goto free_ibft_obj; 711 } 712 713 if (hdr->id == id_nic) { 714 /* 715 * We don't search for the device in other domains than 716 * zero. This is because on x86 platforms the BIOS 717 * executes only devices which are in domain 0. Furthermore, the 718 * iBFT spec doesn't have a domain id field :-( 719 */ 720 pci_dev = pci_get_domain_bus_and_slot(0, 721 (nic->pci_bdf & 0xff00) >> 8, 722 (nic->pci_bdf & 0xff)); 723 if (pci_dev) { 724 rc = sysfs_create_link(&boot_kobj->kobj, 725 &pci_dev->dev.kobj, "device"); 726 pci_dev_put(pci_dev); 727 } 728 } 729 return 0; 730 731 free_ibft_obj: 732 kfree(ibft_kobj); 733 return rc; 734 } 735 736 /* 737 * Scan the IBFT table structure for the NIC and Target fields. When 738 * found add them on the passed-in list. We do not support the other 739 * fields at this point, so they are skipped. 740 */ ibft_register_kobjects(struct acpi_table_ibft * header)741 static int __init ibft_register_kobjects(struct acpi_table_ibft *header) 742 { 743 struct ibft_control *control = NULL; 744 struct iscsi_boot_kobj *boot_kobj; 745 struct ibft_kobject *ibft_kobj; 746 void *ptr, *end; 747 int rc = 0; 748 u16 offset; 749 u16 eot_offset; 750 751 control = (void *)header + sizeof(*header); 752 end = (void *)control + control->hdr.length; 753 eot_offset = (void *)header + header->header.length - (void *)control; 754 rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control, 0); 755 756 /* iBFT table safety checking */ 757 rc |= ((control->hdr.index) ? -ENODEV : 0); 758 rc |= ((control->hdr.length < sizeof(*control)) ? -ENODEV : 0); 759 if (rc) { 760 printk(KERN_ERR "iBFT error: Control header is invalid!\n"); 761 return rc; 762 } 763 for (ptr = &control->initiator_off; ptr + sizeof(u16) <= end; ptr += sizeof(u16)) { 764 offset = *(u16 *)ptr; 765 if (offset && offset < header->header.length && 766 offset < eot_offset) { 767 rc = ibft_create_kobject(header, 768 (void *)header + offset); 769 if (rc) 770 break; 771 } 772 } 773 if (rc) 774 return rc; 775 776 ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL); 777 if (!ibft_kobj) 778 return -ENOMEM; 779 780 ibft_kobj->header = header; 781 ibft_kobj->hdr = NULL; /*for ibft_unregister*/ 782 783 boot_kobj = iscsi_boot_create_acpitbl(boot_kset, 0, 784 ibft_kobj, 785 ibft_attr_show_acpitbl, 786 ibft_check_acpitbl_for, 787 ibft_kobj_release); 788 if (!boot_kobj) { 789 kfree(ibft_kobj); 790 rc = -ENOMEM; 791 } 792 793 return rc; 794 } 795 ibft_unregister(void)796 static void ibft_unregister(void) 797 { 798 struct iscsi_boot_kobj *boot_kobj, *tmp_kobj; 799 struct ibft_kobject *ibft_kobj; 800 801 list_for_each_entry_safe(boot_kobj, tmp_kobj, 802 &boot_kset->kobj_list, list) { 803 ibft_kobj = boot_kobj->data; 804 if (ibft_kobj->hdr && ibft_kobj->hdr->id == id_nic) 805 sysfs_remove_link(&boot_kobj->kobj, "device"); 806 }; 807 } 808 ibft_cleanup(void)809 static void ibft_cleanup(void) 810 { 811 if (boot_kset) { 812 ibft_unregister(); 813 iscsi_boot_destroy_kset(boot_kset); 814 } 815 } 816 ibft_exit(void)817 static void __exit ibft_exit(void) 818 { 819 ibft_cleanup(); 820 } 821 822 #ifdef CONFIG_ACPI 823 static const struct { 824 char *sign; 825 } ibft_signs[] = { 826 /* 827 * One spec says "IBFT", the other says "iBFT". We have to check 828 * for both. 829 */ 830 { ACPI_SIG_IBFT }, 831 { "iBFT" }, 832 { "BIFT" }, /* Broadcom iSCSI Offload */ 833 }; 834 acpi_find_ibft_region(void)835 static void __init acpi_find_ibft_region(void) 836 { 837 int i; 838 struct acpi_table_header *table = NULL; 839 840 if (acpi_disabled) 841 return; 842 843 for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) { 844 acpi_get_table(ibft_signs[i].sign, 0, &table); 845 ibft_addr = (struct acpi_table_ibft *)table; 846 } 847 } 848 #else acpi_find_ibft_region(void)849 static void __init acpi_find_ibft_region(void) 850 { 851 } 852 #endif 853 #ifdef CONFIG_ISCSI_IBFT_FIND acpi_find_isa_region(void)854 static int __init acpi_find_isa_region(void) 855 { 856 if (ibft_phys_addr) { 857 ibft_addr = isa_bus_to_virt(ibft_phys_addr); 858 return 0; 859 } 860 return -ENODEV; 861 } 862 #else acpi_find_isa_region(void)863 static int __init acpi_find_isa_region(void) 864 { 865 return -ENODEV; 866 } 867 #endif 868 /* 869 * ibft_init() - creates sysfs tree entries for the iBFT data. 870 */ ibft_init(void)871 static int __init ibft_init(void) 872 { 873 int rc = 0; 874 875 /* 876 As on UEFI systems the setup_arch()/reserve_ibft_region() 877 is called before ACPI tables are parsed and it only does 878 legacy finding. 879 */ 880 if (acpi_find_isa_region()) 881 acpi_find_ibft_region(); 882 883 if (ibft_addr) { 884 pr_info("iBFT detected.\n"); 885 886 rc = ibft_check_device(); 887 if (rc) 888 return rc; 889 890 boot_kset = iscsi_boot_create_kset("ibft"); 891 if (!boot_kset) 892 return -ENOMEM; 893 894 /* Scan the IBFT for data and register the kobjects. */ 895 rc = ibft_register_kobjects(ibft_addr); 896 if (rc) 897 goto out_free; 898 } else 899 printk(KERN_INFO "No iBFT detected.\n"); 900 901 return 0; 902 903 out_free: 904 ibft_cleanup(); 905 return rc; 906 } 907 908 module_init(ibft_init); 909 module_exit(ibft_exit); 910