iscsi_ibft: Fix isa_bus_to_virt not working under ARM
[linux-2.6-microblaze.git] / drivers / firmware / iscsi_ibft.c
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
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  */
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
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  */
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  */
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
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                 val = cpu_to_be32(~((1 << (32-nic->subnet_mask_prefix))-1));
314                 str += sprintf(str, "%pI4", &val);
315                 break;
316         case ISCSI_BOOT_ETH_PREFIX_LEN:
317                 str += sprintf(str, "%d\n", nic->subnet_mask_prefix);
318                 break;
319         case ISCSI_BOOT_ETH_ORIGIN:
320                 str += sprintf(str, "%d\n", nic->origin);
321                 break;
322         case ISCSI_BOOT_ETH_GATEWAY:
323                 str += sprintf_ipaddr(str, nic->gateway);
324                 break;
325         case ISCSI_BOOT_ETH_PRIMARY_DNS:
326                 str += sprintf_ipaddr(str, nic->primary_dns);
327                 break;
328         case ISCSI_BOOT_ETH_SECONDARY_DNS:
329                 str += sprintf_ipaddr(str, nic->secondary_dns);
330                 break;
331         case ISCSI_BOOT_ETH_DHCP:
332                 str += sprintf_ipaddr(str, nic->dhcp);
333                 break;
334         case ISCSI_BOOT_ETH_VLAN:
335                 str += sprintf(str, "%d\n", nic->vlan);
336                 break;
337         case ISCSI_BOOT_ETH_MAC:
338                 str += sprintf(str, "%pM\n", nic->mac);
339                 break;
340         case ISCSI_BOOT_ETH_HOSTNAME:
341                 str += sprintf_string(str, nic->hostname_len,
342                                       (char *)ibft_loc + nic->hostname_off);
343                 break;
344         default:
345                 break;
346         }
347
348         return str - buf;
349 };
350
351 static ssize_t ibft_attr_show_target(void *data, int type, char *buf)
352 {
353         struct ibft_kobject *entry = data;
354         struct ibft_tgt *tgt = entry->tgt;
355         void *ibft_loc = entry->header;
356         char *str = buf;
357         int i;
358
359         if (!tgt)
360                 return 0;
361
362         switch (type) {
363         case ISCSI_BOOT_TGT_INDEX:
364                 str += sprintf(str, "%d\n", tgt->hdr.index);
365                 break;
366         case ISCSI_BOOT_TGT_FLAGS:
367                 str += sprintf(str, "%d\n", tgt->hdr.flags);
368                 break;
369         case ISCSI_BOOT_TGT_IP_ADDR:
370                 str += sprintf_ipaddr(str, tgt->ip_addr);
371                 break;
372         case ISCSI_BOOT_TGT_PORT:
373                 str += sprintf(str, "%d\n", tgt->port);
374                 break;
375         case ISCSI_BOOT_TGT_LUN:
376                 for (i = 0; i < 8; i++)
377                         str += sprintf(str, "%x", (u8)tgt->lun[i]);
378                 str += sprintf(str, "\n");
379                 break;
380         case ISCSI_BOOT_TGT_NIC_ASSOC:
381                 str += sprintf(str, "%d\n", tgt->nic_assoc);
382                 break;
383         case ISCSI_BOOT_TGT_CHAP_TYPE:
384                 str += sprintf(str, "%d\n", tgt->chap_type);
385                 break;
386         case ISCSI_BOOT_TGT_NAME:
387                 str += sprintf_string(str, tgt->tgt_name_len,
388                                       (char *)ibft_loc + tgt->tgt_name_off);
389                 break;
390         case ISCSI_BOOT_TGT_CHAP_NAME:
391                 str += sprintf_string(str, tgt->chap_name_len,
392                                       (char *)ibft_loc + tgt->chap_name_off);
393                 break;
394         case ISCSI_BOOT_TGT_CHAP_SECRET:
395                 str += sprintf_string(str, tgt->chap_secret_len,
396                                       (char *)ibft_loc + tgt->chap_secret_off);
397                 break;
398         case ISCSI_BOOT_TGT_REV_CHAP_NAME:
399                 str += sprintf_string(str, tgt->rev_chap_name_len,
400                                       (char *)ibft_loc +
401                                       tgt->rev_chap_name_off);
402                 break;
403         case ISCSI_BOOT_TGT_REV_CHAP_SECRET:
404                 str += sprintf_string(str, tgt->rev_chap_secret_len,
405                                       (char *)ibft_loc +
406                                       tgt->rev_chap_secret_off);
407                 break;
408         default:
409                 break;
410         }
411
412         return str - buf;
413 }
414
415 static ssize_t ibft_attr_show_acpitbl(void *data, int type, char *buf)
416 {
417         struct ibft_kobject *entry = data;
418         char *str = buf;
419
420         switch (type) {
421         case ISCSI_BOOT_ACPITBL_SIGNATURE:
422                 str += sprintf_string(str, ACPI_NAMESEG_SIZE,
423                                       entry->header->header.signature);
424                 break;
425         case ISCSI_BOOT_ACPITBL_OEM_ID:
426                 str += sprintf_string(str, ACPI_OEM_ID_SIZE,
427                                       entry->header->header.oem_id);
428                 break;
429         case ISCSI_BOOT_ACPITBL_OEM_TABLE_ID:
430                 str += sprintf_string(str, ACPI_OEM_TABLE_ID_SIZE,
431                                       entry->header->header.oem_table_id);
432                 break;
433         default:
434                 break;
435         }
436
437         return str - buf;
438 }
439
440 static int __init ibft_check_device(void)
441 {
442         int len;
443         u8 *pos;
444         u8 csum = 0;
445
446         len = ibft_addr->header.length;
447
448         /* Sanity checking of iBFT. */
449         if (ibft_addr->header.revision != 1) {
450                 printk(KERN_ERR "iBFT module supports only revision 1, " \
451                                 "while this is %d.\n",
452                                 ibft_addr->header.revision);
453                 return -ENOENT;
454         }
455         for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++)
456                 csum += *pos;
457
458         if (csum) {
459                 printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum);
460                 return -ENOENT;
461         }
462
463         return 0;
464 }
465
466 /*
467  * Helper routiners to check to determine if the entry is valid
468  * in the proper iBFT structure.
469  */
470 static umode_t ibft_check_nic_for(void *data, int type)
471 {
472         struct ibft_kobject *entry = data;
473         struct ibft_nic *nic = entry->nic;
474         umode_t rc = 0;
475
476         switch (type) {
477         case ISCSI_BOOT_ETH_INDEX:
478         case ISCSI_BOOT_ETH_FLAGS:
479                 rc = S_IRUGO;
480                 break;
481         case ISCSI_BOOT_ETH_IP_ADDR:
482                 if (address_not_null(nic->ip_addr))
483                         rc = S_IRUGO;
484                 break;
485         case ISCSI_BOOT_ETH_PREFIX_LEN:
486         case ISCSI_BOOT_ETH_SUBNET_MASK:
487                 if (nic->subnet_mask_prefix)
488                         rc = S_IRUGO;
489                 break;
490         case ISCSI_BOOT_ETH_ORIGIN:
491                 rc = S_IRUGO;
492                 break;
493         case ISCSI_BOOT_ETH_GATEWAY:
494                 if (address_not_null(nic->gateway))
495                         rc = S_IRUGO;
496                 break;
497         case ISCSI_BOOT_ETH_PRIMARY_DNS:
498                 if (address_not_null(nic->primary_dns))
499                         rc = S_IRUGO;
500                 break;
501         case ISCSI_BOOT_ETH_SECONDARY_DNS:
502                 if (address_not_null(nic->secondary_dns))
503                         rc = S_IRUGO;
504                 break;
505         case ISCSI_BOOT_ETH_DHCP:
506                 if (address_not_null(nic->dhcp))
507                         rc = S_IRUGO;
508                 break;
509         case ISCSI_BOOT_ETH_VLAN:
510         case ISCSI_BOOT_ETH_MAC:
511                 rc = S_IRUGO;
512                 break;
513         case ISCSI_BOOT_ETH_HOSTNAME:
514                 if (nic->hostname_off)
515                         rc = S_IRUGO;
516                 break;
517         default:
518                 break;
519         }
520
521         return rc;
522 }
523
524 static umode_t __init ibft_check_tgt_for(void *data, int type)
525 {
526         struct ibft_kobject *entry = data;
527         struct ibft_tgt *tgt = entry->tgt;
528         umode_t rc = 0;
529
530         switch (type) {
531         case ISCSI_BOOT_TGT_INDEX:
532         case ISCSI_BOOT_TGT_FLAGS:
533         case ISCSI_BOOT_TGT_IP_ADDR:
534         case ISCSI_BOOT_TGT_PORT:
535         case ISCSI_BOOT_TGT_LUN:
536         case ISCSI_BOOT_TGT_NIC_ASSOC:
537         case ISCSI_BOOT_TGT_CHAP_TYPE:
538                 rc = S_IRUGO;
539                 break;
540         case ISCSI_BOOT_TGT_NAME:
541                 if (tgt->tgt_name_len)
542                         rc = S_IRUGO;
543                 break;
544         case ISCSI_BOOT_TGT_CHAP_NAME:
545         case ISCSI_BOOT_TGT_CHAP_SECRET:
546                 if (tgt->chap_name_len)
547                         rc = S_IRUGO;
548                 break;
549         case ISCSI_BOOT_TGT_REV_CHAP_NAME:
550         case ISCSI_BOOT_TGT_REV_CHAP_SECRET:
551                 if (tgt->rev_chap_name_len)
552                         rc = S_IRUGO;
553                 break;
554         default:
555                 break;
556         }
557
558         return rc;
559 }
560
561 static umode_t __init ibft_check_initiator_for(void *data, int type)
562 {
563         struct ibft_kobject *entry = data;
564         struct ibft_initiator *init = entry->initiator;
565         umode_t rc = 0;
566
567         switch (type) {
568         case ISCSI_BOOT_INI_INDEX:
569         case ISCSI_BOOT_INI_FLAGS:
570                 rc = S_IRUGO;
571                 break;
572         case ISCSI_BOOT_INI_ISNS_SERVER:
573                 if (address_not_null(init->isns_server))
574                         rc = S_IRUGO;
575                 break;
576         case ISCSI_BOOT_INI_SLP_SERVER:
577                 if (address_not_null(init->slp_server))
578                         rc = S_IRUGO;
579                 break;
580         case ISCSI_BOOT_INI_PRI_RADIUS_SERVER:
581                 if (address_not_null(init->pri_radius_server))
582                         rc = S_IRUGO;
583                 break;
584         case ISCSI_BOOT_INI_SEC_RADIUS_SERVER:
585                 if (address_not_null(init->sec_radius_server))
586                         rc = S_IRUGO;
587                 break;
588         case ISCSI_BOOT_INI_INITIATOR_NAME:
589                 if (init->initiator_name_len)
590                         rc = S_IRUGO;
591                 break;
592         default:
593                 break;
594         }
595
596         return rc;
597 }
598
599 static umode_t __init ibft_check_acpitbl_for(void *data, int type)
600 {
601
602         umode_t rc = 0;
603
604         switch (type) {
605         case ISCSI_BOOT_ACPITBL_SIGNATURE:
606         case ISCSI_BOOT_ACPITBL_OEM_ID:
607         case ISCSI_BOOT_ACPITBL_OEM_TABLE_ID:
608                 rc = S_IRUGO;
609                 break;
610         default:
611                 break;
612         }
613
614         return rc;
615 }
616
617 static void ibft_kobj_release(void *data)
618 {
619         kfree(data);
620 }
621
622 /*
623  * Helper function for ibft_register_kobjects.
624  */
625 static int __init ibft_create_kobject(struct acpi_table_ibft *header,
626                                       struct ibft_hdr *hdr)
627 {
628         struct iscsi_boot_kobj *boot_kobj = NULL;
629         struct ibft_kobject *ibft_kobj = NULL;
630         struct ibft_nic *nic = (struct ibft_nic *)hdr;
631         struct pci_dev *pci_dev;
632         int rc = 0;
633
634         ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);
635         if (!ibft_kobj)
636                 return -ENOMEM;
637
638         ibft_kobj->header = header;
639         ibft_kobj->hdr = hdr;
640
641         switch (hdr->id) {
642         case id_initiator:
643                 rc = ibft_verify_hdr("initiator", hdr, id_initiator,
644                                      sizeof(*ibft_kobj->initiator));
645                 if (rc)
646                         break;
647
648                 boot_kobj = iscsi_boot_create_initiator(boot_kset, hdr->index,
649                                                 ibft_kobj,
650                                                 ibft_attr_show_initiator,
651                                                 ibft_check_initiator_for,
652                                                 ibft_kobj_release);
653                 if (!boot_kobj) {
654                         rc = -ENOMEM;
655                         goto free_ibft_obj;
656                 }
657                 break;
658         case id_nic:
659                 rc = ibft_verify_hdr("ethernet", hdr, id_nic,
660                                      sizeof(*ibft_kobj->nic));
661                 if (rc)
662                         break;
663
664                 boot_kobj = iscsi_boot_create_ethernet(boot_kset, hdr->index,
665                                                        ibft_kobj,
666                                                        ibft_attr_show_nic,
667                                                        ibft_check_nic_for,
668                                                        ibft_kobj_release);
669                 if (!boot_kobj) {
670                         rc = -ENOMEM;
671                         goto free_ibft_obj;
672                 }
673                 break;
674         case id_target:
675                 rc = ibft_verify_hdr("target", hdr, id_target,
676                                      sizeof(*ibft_kobj->tgt));
677                 if (rc)
678                         break;
679
680                 boot_kobj = iscsi_boot_create_target(boot_kset, hdr->index,
681                                                      ibft_kobj,
682                                                      ibft_attr_show_target,
683                                                      ibft_check_tgt_for,
684                                                      ibft_kobj_release);
685                 if (!boot_kobj) {
686                         rc = -ENOMEM;
687                         goto free_ibft_obj;
688                 }
689                 break;
690         case id_reserved:
691         case id_control:
692         case id_extensions:
693                 /* Fields which we don't support. Ignore them */
694                 rc = 1;
695                 break;
696         default:
697                 printk(KERN_ERR "iBFT has unknown structure type (%d). " \
698                                 "Report this bug to %.6s!\n", hdr->id,
699                                 header->header.oem_id);
700                 rc = 1;
701                 break;
702         }
703
704         if (rc) {
705                 /* Skip adding this kobject, but exit with non-fatal error. */
706                 rc = 0;
707                 goto free_ibft_obj;
708         }
709
710         if (hdr->id == id_nic) {
711                 /*
712                 * We don't search for the device in other domains than
713                 * zero. This is because on x86 platforms the BIOS
714                 * executes only devices which are in domain 0. Furthermore, the
715                 * iBFT spec doesn't have a domain id field :-(
716                 */
717                 pci_dev = pci_get_domain_bus_and_slot(0,
718                                                 (nic->pci_bdf & 0xff00) >> 8,
719                                                 (nic->pci_bdf & 0xff));
720                 if (pci_dev) {
721                         rc = sysfs_create_link(&boot_kobj->kobj,
722                                                &pci_dev->dev.kobj, "device");
723                         pci_dev_put(pci_dev);
724                 }
725         }
726         return 0;
727
728 free_ibft_obj:
729         kfree(ibft_kobj);
730         return rc;
731 }
732
733 /*
734  * Scan the IBFT table structure for the NIC and Target fields. When
735  * found add them on the passed-in list. We do not support the other
736  * fields at this point, so they are skipped.
737  */
738 static int __init ibft_register_kobjects(struct acpi_table_ibft *header)
739 {
740         struct ibft_control *control = NULL;
741         struct iscsi_boot_kobj *boot_kobj;
742         struct ibft_kobject *ibft_kobj;
743         void *ptr, *end;
744         int rc = 0;
745         u16 offset;
746         u16 eot_offset;
747
748         control = (void *)header + sizeof(*header);
749         end = (void *)control + control->hdr.length;
750         eot_offset = (void *)header + header->header.length - (void *)control;
751         rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control, 0);
752
753         /* iBFT table safety checking */
754         rc |= ((control->hdr.index) ? -ENODEV : 0);
755         rc |= ((control->hdr.length < sizeof(*control)) ? -ENODEV : 0);
756         if (rc) {
757                 printk(KERN_ERR "iBFT error: Control header is invalid!\n");
758                 return rc;
759         }
760         for (ptr = &control->initiator_off; ptr + sizeof(u16) <= end; ptr += sizeof(u16)) {
761                 offset = *(u16 *)ptr;
762                 if (offset && offset < header->header.length &&
763                                                 offset < eot_offset) {
764                         rc = ibft_create_kobject(header,
765                                                  (void *)header + offset);
766                         if (rc)
767                                 break;
768                 }
769         }
770         if (rc)
771                 return rc;
772
773         ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);
774         if (!ibft_kobj)
775                 return -ENOMEM;
776
777         ibft_kobj->header = header;
778         ibft_kobj->hdr = NULL; /*for ibft_unregister*/
779
780         boot_kobj = iscsi_boot_create_acpitbl(boot_kset, 0,
781                                         ibft_kobj,
782                                         ibft_attr_show_acpitbl,
783                                         ibft_check_acpitbl_for,
784                                         ibft_kobj_release);
785         if (!boot_kobj)  {
786                 kfree(ibft_kobj);
787                 rc = -ENOMEM;
788         }
789
790         return rc;
791 }
792
793 static void ibft_unregister(void)
794 {
795         struct iscsi_boot_kobj *boot_kobj, *tmp_kobj;
796         struct ibft_kobject *ibft_kobj;
797
798         list_for_each_entry_safe(boot_kobj, tmp_kobj,
799                                  &boot_kset->kobj_list, list) {
800                 ibft_kobj = boot_kobj->data;
801                 if (ibft_kobj->hdr && ibft_kobj->hdr->id == id_nic)
802                         sysfs_remove_link(&boot_kobj->kobj, "device");
803         };
804 }
805
806 static void ibft_cleanup(void)
807 {
808         if (boot_kset) {
809                 ibft_unregister();
810                 iscsi_boot_destroy_kset(boot_kset);
811         }
812 }
813
814 static void __exit ibft_exit(void)
815 {
816         ibft_cleanup();
817 }
818
819 #ifdef CONFIG_ACPI
820 static const struct {
821         char *sign;
822 } ibft_signs[] = {
823         /*
824          * One spec says "IBFT", the other says "iBFT". We have to check
825          * for both.
826          */
827         { ACPI_SIG_IBFT },
828         { "iBFT" },
829         { "BIFT" },     /* Broadcom iSCSI Offload */
830 };
831
832 static void __init acpi_find_ibft_region(void)
833 {
834         int i;
835         struct acpi_table_header *table = NULL;
836
837         if (acpi_disabled)
838                 return;
839
840         for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) {
841                 acpi_get_table(ibft_signs[i].sign, 0, &table);
842                 ibft_addr = (struct acpi_table_ibft *)table;
843         }
844 }
845 #else
846 static void __init acpi_find_ibft_region(void)
847 {
848 }
849 #endif
850 #ifdef CONFIG_ISCSI_IBFT_FIND
851 static int __init acpi_find_isa_region(void)
852 {
853         if (ibft_phys_addr) {
854                 ibft_addr = isa_bus_to_virt(ibft_phys_addr);
855                 return 0;
856         }
857         return -ENODEV;
858 }
859 #else
860 static int __init acpi_find_isa_region(void)
861 {
862         return -ENODEV;
863 }
864 #endif
865 /*
866  * ibft_init() - creates sysfs tree entries for the iBFT data.
867  */
868 static int __init ibft_init(void)
869 {
870         int rc = 0;
871
872         /*
873            As on UEFI systems the setup_arch()/reserve_ibft_region()
874            is called before ACPI tables are parsed and it only does
875            legacy finding.
876         */
877         if (acpi_find_isa_region())
878                 acpi_find_ibft_region();
879
880         if (ibft_addr) {
881                 pr_info("iBFT detected.\n");
882
883                 rc = ibft_check_device();
884                 if (rc)
885                         return rc;
886
887                 boot_kset = iscsi_boot_create_kset("ibft");
888                 if (!boot_kset)
889                         return -ENOMEM;
890
891                 /* Scan the IBFT for data and register the kobjects. */
892                 rc = ibft_register_kobjects(ibft_addr);
893                 if (rc)
894                         goto out_free;
895         } else
896                 printk(KERN_INFO "No iBFT detected.\n");
897
898         return 0;
899
900 out_free:
901         ibft_cleanup();
902         return rc;
903 }
904
905 module_init(ibft_init);
906 module_exit(ibft_exit);