1 /*
2 * Copyright 2007-2010 Red Hat, Inc.
3 * by Peter Jones <pjones@redhat.com>
4 * Copyright 2008 IBM, Inc.
5 * by Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
6 * Copyright 2008
7 * by Konrad Rzeszutek <ketuzsezr@darnok.org>
8 *
9 * This code exposes the iSCSI Boot Format Table to userland via sysfs.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License v2.0 as published by
13 * the Free Software Foundation
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * Changelog:
21 *
22 * 06 Jan 2010 - Peter Jones <pjones@redhat.com>
23 * New changelog entries are in the git log from now on. Not here.
24 *
25 * 14 Mar 2008 - Konrad Rzeszutek <ketuzsezr@darnok.org>
26 * Updated comments and copyrights. (v0.4.9)
27 *
28 * 11 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
29 * Converted to using ibft_addr. (v0.4.8)
30 *
31 * 8 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
32 * Combined two functions in one: reserve_ibft_region. (v0.4.7)
33 *
34 * 30 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
35 * Added logic to handle IPv6 addresses. (v0.4.6)
36 *
37 * 25 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
38 * Added logic to handle badly not-to-spec iBFT. (v0.4.5)
39 *
40 * 4 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
41 * Added __init to function declarations. (v0.4.4)
42 *
43 * 21 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
44 * Updated kobject registration, combined unregister functions in one
45 * and code and style cleanup. (v0.4.3)
46 *
47 * 5 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
48 * Added end-markers to enums and re-organized kobject registration. (v0.4.2)
49 *
50 * 4 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
51 * Created 'device' sysfs link to the NIC and style cleanup. (v0.4.1)
52 *
53 * 28 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
54 * Added sysfs-ibft documentation, moved 'find_ibft' function to
55 * in its own file and added text attributes for every struct field. (v0.4)
56 *
57 * 21 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
58 * Added text attributes emulating OpenFirmware /proc/device-tree naming.
59 * Removed binary /sysfs interface (v0.3)
60 *
61 * 29 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
62 * Added functionality in setup.c to reserve iBFT region. (v0.2)
63 *
64 * 27 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
65 * First version exposing iBFT data via a binary /sysfs. (v0.1)
66 *
67 */
68
69
70 #include <linux/blkdev.h>
71 #include <linux/capability.h>
72 #include <linux/ctype.h>
73 #include <linux/device.h>
74 #include <linux/err.h>
75 #include <linux/init.h>
76 #include <linux/iscsi_ibft.h>
77 #include <linux/limits.h>
78 #include <linux/module.h>
79 #include <linux/pci.h>
80 #include <linux/slab.h>
81 #include <linux/stat.h>
82 #include <linux/string.h>
83 #include <linux/types.h>
84 #include <linux/acpi.h>
85 #include <linux/iscsi_boot_sysfs.h>
86
87 #define IBFT_ISCSI_VERSION "0.5.0"
88 #define IBFT_ISCSI_DATE "2010-Feb-25"
89
90 MODULE_AUTHOR("Peter Jones <pjones@redhat.com> and "
91 "Konrad Rzeszutek <ketuzsezr@darnok.org>");
92 MODULE_DESCRIPTION("sysfs interface to BIOS iBFT information");
93 MODULE_LICENSE("GPL");
94 MODULE_VERSION(IBFT_ISCSI_VERSION);
95
96 #ifndef CONFIG_ISCSI_IBFT_FIND
97 struct acpi_table_ibft *ibft_addr;
98 #endif
99
100 struct ibft_hdr {
101 u8 id;
102 u8 version;
103 u16 length;
104 u8 index;
105 u8 flags;
106 } __attribute__((__packed__));
107
108 struct ibft_control {
109 struct ibft_hdr hdr;
110 u16 extensions;
111 u16 initiator_off;
112 u16 nic0_off;
113 u16 tgt0_off;
114 u16 nic1_off;
115 u16 tgt1_off;
116 } __attribute__((__packed__));
117
118 struct ibft_initiator {
119 struct ibft_hdr hdr;
120 char isns_server[16];
121 char slp_server[16];
122 char pri_radius_server[16];
123 char sec_radius_server[16];
124 u16 initiator_name_len;
125 u16 initiator_name_off;
126 } __attribute__((__packed__));
127
128 struct ibft_nic {
129 struct ibft_hdr hdr;
130 char ip_addr[16];
131 u8 subnet_mask_prefix;
132 u8 origin;
133 char gateway[16];
134 char primary_dns[16];
135 char secondary_dns[16];
136 char dhcp[16];
137 u16 vlan;
138 char mac[6];
139 u16 pci_bdf;
140 u16 hostname_len;
141 u16 hostname_off;
142 } __attribute__((__packed__));
143
144 struct ibft_tgt {
145 struct ibft_hdr hdr;
146 char ip_addr[16];
147 u16 port;
148 char lun[8];
149 u8 chap_type;
150 u8 nic_assoc;
151 u16 tgt_name_len;
152 u16 tgt_name_off;
153 u16 chap_name_len;
154 u16 chap_name_off;
155 u16 chap_secret_len;
156 u16 chap_secret_off;
157 u16 rev_chap_name_len;
158 u16 rev_chap_name_off;
159 u16 rev_chap_secret_len;
160 u16 rev_chap_secret_off;
161 } __attribute__((__packed__));
162
163 /*
164 * The kobject different types and its names.
165 *
166 */
167 enum ibft_id {
168 id_reserved = 0, /* We don't support. */
169 id_control = 1, /* Should show up only once and is not exported. */
170 id_initiator = 2,
171 id_nic = 3,
172 id_target = 4,
173 id_extensions = 5, /* We don't support. */
174 id_end_marker,
175 };
176
177 /*
178 * The kobject and attribute structures.
179 */
180
181 struct ibft_kobject {
182 struct acpi_table_ibft *header;
183 union {
184 struct ibft_initiator *initiator;
185 struct ibft_nic *nic;
186 struct ibft_tgt *tgt;
187 struct ibft_hdr *hdr;
188 };
189 };
190
191 static struct iscsi_boot_kset *boot_kset;
192
193 /* fully null address */
194 static const char nulls[16];
195
196 /* IPv4-mapped IPv6 ::ffff:0.0.0.0 */
197 static const char mapped_nulls[16] = { 0x00, 0x00, 0x00, 0x00,
198 0x00, 0x00, 0x00, 0x00,
199 0x00, 0x00, 0xff, 0xff,
200 0x00, 0x00, 0x00, 0x00 };
201
address_not_null(u8 * ip)202 static int address_not_null(u8 *ip)
203 {
204 return (memcmp(ip, nulls, 16) && memcmp(ip, mapped_nulls, 16));
205 }
206
207 /*
208 * Helper functions to parse data properly.
209 */
sprintf_ipaddr(char * buf,u8 * ip)210 static ssize_t sprintf_ipaddr(char *buf, u8 *ip)
211 {
212 char *str = buf;
213
214 if (ip[0] == 0 && ip[1] == 0 && ip[2] == 0 && ip[3] == 0 &&
215 ip[4] == 0 && ip[5] == 0 && ip[6] == 0 && ip[7] == 0 &&
216 ip[8] == 0 && ip[9] == 0 && ip[10] == 0xff && ip[11] == 0xff) {
217 /*
218 * IPV4
219 */
220 str += sprintf(buf, "%pI4", ip + 12);
221 } else {
222 /*
223 * IPv6
224 */
225 str += sprintf(str, "%pI6", ip);
226 }
227 str += sprintf(str, "\n");
228 return str - buf;
229 }
230
sprintf_string(char * str,int len,char * buf)231 static ssize_t sprintf_string(char *str, int len, char *buf)
232 {
233 return sprintf(str, "%.*s\n", len, buf);
234 }
235
236 /*
237 * Helper function to verify the IBFT header.
238 */
ibft_verify_hdr(char * t,struct ibft_hdr * hdr,int id,int length)239 static int ibft_verify_hdr(char *t, struct ibft_hdr *hdr, int id, int length)
240 {
241 if (hdr->id != id) {
242 printk(KERN_ERR "iBFT error: We expected the %s " \
243 "field header.id to have %d but " \
244 "found %d instead!\n", t, id, hdr->id);
245 return -ENODEV;
246 }
247 if (hdr->length != length) {
248 printk(KERN_ERR "iBFT error: We expected the %s " \
249 "field header.length to have %d but " \
250 "found %d instead!\n", t, length, hdr->length);
251 return -ENODEV;
252 }
253
254 return 0;
255 }
256
257 /*
258 * Routines for parsing the iBFT data to be human readable.
259 */
ibft_attr_show_initiator(void * data,int type,char * buf)260 static ssize_t ibft_attr_show_initiator(void *data, int type, char *buf)
261 {
262 struct ibft_kobject *entry = data;
263 struct ibft_initiator *initiator = entry->initiator;
264 void *ibft_loc = entry->header;
265 char *str = buf;
266
267 if (!initiator)
268 return 0;
269
270 switch (type) {
271 case ISCSI_BOOT_INI_INDEX:
272 str += sprintf(str, "%d\n", initiator->hdr.index);
273 break;
274 case ISCSI_BOOT_INI_FLAGS:
275 str += sprintf(str, "%d\n", initiator->hdr.flags);
276 break;
277 case ISCSI_BOOT_INI_ISNS_SERVER:
278 str += sprintf_ipaddr(str, initiator->isns_server);
279 break;
280 case ISCSI_BOOT_INI_SLP_SERVER:
281 str += sprintf_ipaddr(str, initiator->slp_server);
282 break;
283 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER:
284 str += sprintf_ipaddr(str, initiator->pri_radius_server);
285 break;
286 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER:
287 str += sprintf_ipaddr(str, initiator->sec_radius_server);
288 break;
289 case ISCSI_BOOT_INI_INITIATOR_NAME:
290 str += sprintf_string(str, initiator->initiator_name_len,
291 (char *)ibft_loc +
292 initiator->initiator_name_off);
293 break;
294 default:
295 break;
296 }
297
298 return str - buf;
299 }
300
ibft_attr_show_nic(void * data,int type,char * buf)301 static ssize_t ibft_attr_show_nic(void *data, int type, char *buf)
302 {
303 struct ibft_kobject *entry = data;
304 struct ibft_nic *nic = entry->nic;
305 void *ibft_loc = entry->header;
306 char *str = buf;
307 __be32 val;
308
309 if (!nic)
310 return 0;
311
312 switch (type) {
313 case ISCSI_BOOT_ETH_INDEX:
314 str += sprintf(str, "%d\n", nic->hdr.index);
315 break;
316 case ISCSI_BOOT_ETH_FLAGS:
317 str += sprintf(str, "%d\n", nic->hdr.flags);
318 break;
319 case ISCSI_BOOT_ETH_IP_ADDR:
320 str += sprintf_ipaddr(str, nic->ip_addr);
321 break;
322 case ISCSI_BOOT_ETH_SUBNET_MASK:
323 val = cpu_to_be32(~((1 << (32-nic->subnet_mask_prefix))-1));
324 str += sprintf(str, "%pI4", &val);
325 break;
326 case ISCSI_BOOT_ETH_ORIGIN:
327 str += sprintf(str, "%d\n", nic->origin);
328 break;
329 case ISCSI_BOOT_ETH_GATEWAY:
330 str += sprintf_ipaddr(str, nic->gateway);
331 break;
332 case ISCSI_BOOT_ETH_PRIMARY_DNS:
333 str += sprintf_ipaddr(str, nic->primary_dns);
334 break;
335 case ISCSI_BOOT_ETH_SECONDARY_DNS:
336 str += sprintf_ipaddr(str, nic->secondary_dns);
337 break;
338 case ISCSI_BOOT_ETH_DHCP:
339 str += sprintf_ipaddr(str, nic->dhcp);
340 break;
341 case ISCSI_BOOT_ETH_VLAN:
342 str += sprintf(str, "%d\n", nic->vlan);
343 break;
344 case ISCSI_BOOT_ETH_MAC:
345 str += sprintf(str, "%pM\n", nic->mac);
346 break;
347 case ISCSI_BOOT_ETH_HOSTNAME:
348 str += sprintf_string(str, nic->hostname_len,
349 (char *)ibft_loc + nic->hostname_off);
350 break;
351 default:
352 break;
353 }
354
355 return str - buf;
356 };
357
ibft_attr_show_target(void * data,int type,char * buf)358 static ssize_t ibft_attr_show_target(void *data, int type, char *buf)
359 {
360 struct ibft_kobject *entry = data;
361 struct ibft_tgt *tgt = entry->tgt;
362 void *ibft_loc = entry->header;
363 char *str = buf;
364 int i;
365
366 if (!tgt)
367 return 0;
368
369 switch (type) {
370 case ISCSI_BOOT_TGT_INDEX:
371 str += sprintf(str, "%d\n", tgt->hdr.index);
372 break;
373 case ISCSI_BOOT_TGT_FLAGS:
374 str += sprintf(str, "%d\n", tgt->hdr.flags);
375 break;
376 case ISCSI_BOOT_TGT_IP_ADDR:
377 str += sprintf_ipaddr(str, tgt->ip_addr);
378 break;
379 case ISCSI_BOOT_TGT_PORT:
380 str += sprintf(str, "%d\n", tgt->port);
381 break;
382 case ISCSI_BOOT_TGT_LUN:
383 for (i = 0; i < 8; i++)
384 str += sprintf(str, "%x", (u8)tgt->lun[i]);
385 str += sprintf(str, "\n");
386 break;
387 case ISCSI_BOOT_TGT_NIC_ASSOC:
388 str += sprintf(str, "%d\n", tgt->nic_assoc);
389 break;
390 case ISCSI_BOOT_TGT_CHAP_TYPE:
391 str += sprintf(str, "%d\n", tgt->chap_type);
392 break;
393 case ISCSI_BOOT_TGT_NAME:
394 str += sprintf_string(str, tgt->tgt_name_len,
395 (char *)ibft_loc + tgt->tgt_name_off);
396 break;
397 case ISCSI_BOOT_TGT_CHAP_NAME:
398 str += sprintf_string(str, tgt->chap_name_len,
399 (char *)ibft_loc + tgt->chap_name_off);
400 break;
401 case ISCSI_BOOT_TGT_CHAP_SECRET:
402 str += sprintf_string(str, tgt->chap_secret_len,
403 (char *)ibft_loc + tgt->chap_secret_off);
404 break;
405 case ISCSI_BOOT_TGT_REV_CHAP_NAME:
406 str += sprintf_string(str, tgt->rev_chap_name_len,
407 (char *)ibft_loc +
408 tgt->rev_chap_name_off);
409 break;
410 case ISCSI_BOOT_TGT_REV_CHAP_SECRET:
411 str += sprintf_string(str, tgt->rev_chap_secret_len,
412 (char *)ibft_loc +
413 tgt->rev_chap_secret_off);
414 break;
415 default:
416 break;
417 }
418
419 return str - buf;
420 }
421
ibft_check_device(void)422 static int __init ibft_check_device(void)
423 {
424 int len;
425 u8 *pos;
426 u8 csum = 0;
427
428 len = ibft_addr->header.length;
429
430 /* Sanity checking of iBFT. */
431 if (ibft_addr->header.revision != 1) {
432 printk(KERN_ERR "iBFT module supports only revision 1, " \
433 "while this is %d.\n",
434 ibft_addr->header.revision);
435 return -ENOENT;
436 }
437 for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++)
438 csum += *pos;
439
440 if (csum) {
441 printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum);
442 return -ENOENT;
443 }
444
445 return 0;
446 }
447
448 /*
449 * Helper routiners to check to determine if the entry is valid
450 * in the proper iBFT structure.
451 */
ibft_check_nic_for(void * data,int type)452 static umode_t ibft_check_nic_for(void *data, int type)
453 {
454 struct ibft_kobject *entry = data;
455 struct ibft_nic *nic = entry->nic;
456 umode_t rc = 0;
457
458 switch (type) {
459 case ISCSI_BOOT_ETH_INDEX:
460 case ISCSI_BOOT_ETH_FLAGS:
461 rc = S_IRUGO;
462 break;
463 case ISCSI_BOOT_ETH_IP_ADDR:
464 if (address_not_null(nic->ip_addr))
465 rc = S_IRUGO;
466 break;
467 case ISCSI_BOOT_ETH_SUBNET_MASK:
468 if (nic->subnet_mask_prefix)
469 rc = S_IRUGO;
470 break;
471 case ISCSI_BOOT_ETH_ORIGIN:
472 rc = S_IRUGO;
473 break;
474 case ISCSI_BOOT_ETH_GATEWAY:
475 if (address_not_null(nic->gateway))
476 rc = S_IRUGO;
477 break;
478 case ISCSI_BOOT_ETH_PRIMARY_DNS:
479 if (address_not_null(nic->primary_dns))
480 rc = S_IRUGO;
481 break;
482 case ISCSI_BOOT_ETH_SECONDARY_DNS:
483 if (address_not_null(nic->secondary_dns))
484 rc = S_IRUGO;
485 break;
486 case ISCSI_BOOT_ETH_DHCP:
487 if (address_not_null(nic->dhcp))
488 rc = S_IRUGO;
489 break;
490 case ISCSI_BOOT_ETH_VLAN:
491 case ISCSI_BOOT_ETH_MAC:
492 rc = S_IRUGO;
493 break;
494 case ISCSI_BOOT_ETH_HOSTNAME:
495 if (nic->hostname_off)
496 rc = S_IRUGO;
497 break;
498 default:
499 break;
500 }
501
502 return rc;
503 }
504
ibft_check_tgt_for(void * data,int type)505 static umode_t __init ibft_check_tgt_for(void *data, int type)
506 {
507 struct ibft_kobject *entry = data;
508 struct ibft_tgt *tgt = entry->tgt;
509 umode_t rc = 0;
510
511 switch (type) {
512 case ISCSI_BOOT_TGT_INDEX:
513 case ISCSI_BOOT_TGT_FLAGS:
514 case ISCSI_BOOT_TGT_IP_ADDR:
515 case ISCSI_BOOT_TGT_PORT:
516 case ISCSI_BOOT_TGT_LUN:
517 case ISCSI_BOOT_TGT_NIC_ASSOC:
518 case ISCSI_BOOT_TGT_CHAP_TYPE:
519 rc = S_IRUGO;
520 break;
521 case ISCSI_BOOT_TGT_NAME:
522 if (tgt->tgt_name_len)
523 rc = S_IRUGO;
524 break;
525 case ISCSI_BOOT_TGT_CHAP_NAME:
526 case ISCSI_BOOT_TGT_CHAP_SECRET:
527 if (tgt->chap_name_len)
528 rc = S_IRUGO;
529 break;
530 case ISCSI_BOOT_TGT_REV_CHAP_NAME:
531 case ISCSI_BOOT_TGT_REV_CHAP_SECRET:
532 if (tgt->rev_chap_name_len)
533 rc = S_IRUGO;
534 break;
535 default:
536 break;
537 }
538
539 return rc;
540 }
541
ibft_check_initiator_for(void * data,int type)542 static umode_t __init ibft_check_initiator_for(void *data, int type)
543 {
544 struct ibft_kobject *entry = data;
545 struct ibft_initiator *init = entry->initiator;
546 umode_t rc = 0;
547
548 switch (type) {
549 case ISCSI_BOOT_INI_INDEX:
550 case ISCSI_BOOT_INI_FLAGS:
551 rc = S_IRUGO;
552 break;
553 case ISCSI_BOOT_INI_ISNS_SERVER:
554 if (address_not_null(init->isns_server))
555 rc = S_IRUGO;
556 break;
557 case ISCSI_BOOT_INI_SLP_SERVER:
558 if (address_not_null(init->slp_server))
559 rc = S_IRUGO;
560 break;
561 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER:
562 if (address_not_null(init->pri_radius_server))
563 rc = S_IRUGO;
564 break;
565 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER:
566 if (address_not_null(init->sec_radius_server))
567 rc = S_IRUGO;
568 break;
569 case ISCSI_BOOT_INI_INITIATOR_NAME:
570 if (init->initiator_name_len)
571 rc = S_IRUGO;
572 break;
573 default:
574 break;
575 }
576
577 return rc;
578 }
579
ibft_kobj_release(void * data)580 static void ibft_kobj_release(void *data)
581 {
582 kfree(data);
583 }
584
585 /*
586 * Helper function for ibft_register_kobjects.
587 */
ibft_create_kobject(struct acpi_table_ibft * header,struct ibft_hdr * hdr)588 static int __init ibft_create_kobject(struct acpi_table_ibft *header,
589 struct ibft_hdr *hdr)
590 {
591 struct iscsi_boot_kobj *boot_kobj = NULL;
592 struct ibft_kobject *ibft_kobj = NULL;
593 struct ibft_nic *nic = (struct ibft_nic *)hdr;
594 struct pci_dev *pci_dev;
595 int rc = 0;
596
597 ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);
598 if (!ibft_kobj)
599 return -ENOMEM;
600
601 ibft_kobj->header = header;
602 ibft_kobj->hdr = hdr;
603
604 switch (hdr->id) {
605 case id_initiator:
606 rc = ibft_verify_hdr("initiator", hdr, id_initiator,
607 sizeof(*ibft_kobj->initiator));
608 if (rc)
609 break;
610
611 boot_kobj = iscsi_boot_create_initiator(boot_kset, hdr->index,
612 ibft_kobj,
613 ibft_attr_show_initiator,
614 ibft_check_initiator_for,
615 ibft_kobj_release);
616 if (!boot_kobj) {
617 rc = -ENOMEM;
618 goto free_ibft_obj;
619 }
620 break;
621 case id_nic:
622 rc = ibft_verify_hdr("ethernet", hdr, id_nic,
623 sizeof(*ibft_kobj->nic));
624 if (rc)
625 break;
626
627 boot_kobj = iscsi_boot_create_ethernet(boot_kset, hdr->index,
628 ibft_kobj,
629 ibft_attr_show_nic,
630 ibft_check_nic_for,
631 ibft_kobj_release);
632 if (!boot_kobj) {
633 rc = -ENOMEM;
634 goto free_ibft_obj;
635 }
636 break;
637 case id_target:
638 rc = ibft_verify_hdr("target", hdr, id_target,
639 sizeof(*ibft_kobj->tgt));
640 if (rc)
641 break;
642
643 boot_kobj = iscsi_boot_create_target(boot_kset, hdr->index,
644 ibft_kobj,
645 ibft_attr_show_target,
646 ibft_check_tgt_for,
647 ibft_kobj_release);
648 if (!boot_kobj) {
649 rc = -ENOMEM;
650 goto free_ibft_obj;
651 }
652 break;
653 case id_reserved:
654 case id_control:
655 case id_extensions:
656 /* Fields which we don't support. Ignore them */
657 rc = 1;
658 break;
659 default:
660 printk(KERN_ERR "iBFT has unknown structure type (%d). " \
661 "Report this bug to %.6s!\n", hdr->id,
662 header->header.oem_id);
663 rc = 1;
664 break;
665 }
666
667 if (rc) {
668 /* Skip adding this kobject, but exit with non-fatal error. */
669 rc = 0;
670 goto free_ibft_obj;
671 }
672
673 if (hdr->id == id_nic) {
674 /*
675 * We don't search for the device in other domains than
676 * zero. This is because on x86 platforms the BIOS
677 * executes only devices which are in domain 0. Furthermore, the
678 * iBFT spec doesn't have a domain id field :-(
679 */
680 pci_dev = pci_get_bus_and_slot((nic->pci_bdf & 0xff00) >> 8,
681 (nic->pci_bdf & 0xff));
682 if (pci_dev) {
683 rc = sysfs_create_link(&boot_kobj->kobj,
684 &pci_dev->dev.kobj, "device");
685 pci_dev_put(pci_dev);
686 }
687 }
688 return 0;
689
690 free_ibft_obj:
691 kfree(ibft_kobj);
692 return rc;
693 }
694
695 /*
696 * Scan the IBFT table structure for the NIC and Target fields. When
697 * found add them on the passed-in list. We do not support the other
698 * fields at this point, so they are skipped.
699 */
ibft_register_kobjects(struct acpi_table_ibft * header)700 static int __init ibft_register_kobjects(struct acpi_table_ibft *header)
701 {
702 struct ibft_control *control = NULL;
703 void *ptr, *end;
704 int rc = 0;
705 u16 offset;
706 u16 eot_offset;
707
708 control = (void *)header + sizeof(*header);
709 end = (void *)control + control->hdr.length;
710 eot_offset = (void *)header + header->header.length - (void *)control;
711 rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control,
712 sizeof(*control));
713
714 /* iBFT table safety checking */
715 rc |= ((control->hdr.index) ? -ENODEV : 0);
716 if (rc) {
717 printk(KERN_ERR "iBFT error: Control header is invalid!\n");
718 return rc;
719 }
720 for (ptr = &control->initiator_off; ptr < end; ptr += sizeof(u16)) {
721 offset = *(u16 *)ptr;
722 if (offset && offset < header->header.length &&
723 offset < eot_offset) {
724 rc = ibft_create_kobject(header,
725 (void *)header + offset);
726 if (rc)
727 break;
728 }
729 }
730
731 return rc;
732 }
733
ibft_unregister(void)734 static void ibft_unregister(void)
735 {
736 struct iscsi_boot_kobj *boot_kobj, *tmp_kobj;
737 struct ibft_kobject *ibft_kobj;
738
739 list_for_each_entry_safe(boot_kobj, tmp_kobj,
740 &boot_kset->kobj_list, list) {
741 ibft_kobj = boot_kobj->data;
742 if (ibft_kobj->hdr->id == id_nic)
743 sysfs_remove_link(&boot_kobj->kobj, "device");
744 };
745 }
746
ibft_cleanup(void)747 static void ibft_cleanup(void)
748 {
749 if (boot_kset) {
750 ibft_unregister();
751 iscsi_boot_destroy_kset(boot_kset);
752 }
753 }
754
ibft_exit(void)755 static void __exit ibft_exit(void)
756 {
757 ibft_cleanup();
758 }
759
760 #ifdef CONFIG_ACPI
761 static const struct {
762 char *sign;
763 } ibft_signs[] = {
764 /*
765 * One spec says "IBFT", the other says "iBFT". We have to check
766 * for both.
767 */
768 { ACPI_SIG_IBFT },
769 { "iBFT" },
770 { "BIFT" }, /* Broadcom iSCSI Offload */
771 };
772
acpi_find_ibft_region(void)773 static void __init acpi_find_ibft_region(void)
774 {
775 int i;
776 struct acpi_table_header *table = NULL;
777
778 if (acpi_disabled)
779 return;
780
781 for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) {
782 acpi_get_table(ibft_signs[i].sign, 0, &table);
783 ibft_addr = (struct acpi_table_ibft *)table;
784 }
785 }
786 #else
acpi_find_ibft_region(void)787 static void __init acpi_find_ibft_region(void)
788 {
789 }
790 #endif
791
792 /*
793 * ibft_init() - creates sysfs tree entries for the iBFT data.
794 */
ibft_init(void)795 static int __init ibft_init(void)
796 {
797 int rc = 0;
798
799 /*
800 As on UEFI systems the setup_arch()/find_ibft_region()
801 is called before ACPI tables are parsed and it only does
802 legacy finding.
803 */
804 if (!ibft_addr)
805 acpi_find_ibft_region();
806
807 if (ibft_addr) {
808 pr_info("iBFT detected.\n");
809
810 rc = ibft_check_device();
811 if (rc)
812 return rc;
813
814 boot_kset = iscsi_boot_create_kset("ibft");
815 if (!boot_kset)
816 return -ENOMEM;
817
818 /* Scan the IBFT for data and register the kobjects. */
819 rc = ibft_register_kobjects(ibft_addr);
820 if (rc)
821 goto out_free;
822 } else
823 printk(KERN_INFO "No iBFT detected.\n");
824
825 return 0;
826
827 out_free:
828 ibft_cleanup();
829 return rc;
830 }
831
832 module_init(ibft_init);
833 module_exit(ibft_exit);
834