Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6
[linux-2.6] / arch / s390 / kernel / ipl.c
1 /*
2  *  arch/s390/kernel/ipl.c
3  *    ipl/reipl/dump support for Linux on s390.
4  *
5  *    Copyright IBM Corp. 2005,2007
6  *    Author(s): Michael Holzheu <holzheu@de.ibm.com>
7  *               Heiko Carstens <heiko.carstens@de.ibm.com>
8  *               Volker Sameske <sameske@de.ibm.com>
9  */
10
11 #include <linux/types.h>
12 #include <linux/module.h>
13 #include <linux/device.h>
14 #include <linux/delay.h>
15 #include <linux/reboot.h>
16 #include <linux/ctype.h>
17 #include <asm/ipl.h>
18 #include <asm/smp.h>
19 #include <asm/setup.h>
20 #include <asm/cpcmd.h>
21 #include <asm/cio.h>
22 #include <asm/ebcdic.h>
23 #include <asm/reset.h>
24 #include <asm/sclp.h>
25
26 #define IPL_PARM_BLOCK_VERSION 0
27
28 #define IPL_UNKNOWN_STR         "unknown"
29 #define IPL_CCW_STR             "ccw"
30 #define IPL_FCP_STR             "fcp"
31 #define IPL_FCP_DUMP_STR        "fcp_dump"
32 #define IPL_NSS_STR             "nss"
33
34 #define DUMP_CCW_STR            "ccw"
35 #define DUMP_FCP_STR            "fcp"
36 #define DUMP_NONE_STR           "none"
37
38 /*
39  * Four shutdown trigger types are supported:
40  * - panic
41  * - halt
42  * - power off
43  * - reipl
44  */
45 #define ON_PANIC_STR            "on_panic"
46 #define ON_HALT_STR             "on_halt"
47 #define ON_POFF_STR             "on_poff"
48 #define ON_REIPL_STR            "on_reboot"
49
50 struct shutdown_action;
51 struct shutdown_trigger {
52         char *name;
53         struct shutdown_action *action;
54 };
55
56 /*
57  * Five shutdown action types are supported:
58  */
59 #define SHUTDOWN_ACTION_IPL_STR         "ipl"
60 #define SHUTDOWN_ACTION_REIPL_STR       "reipl"
61 #define SHUTDOWN_ACTION_DUMP_STR        "dump"
62 #define SHUTDOWN_ACTION_VMCMD_STR       "vmcmd"
63 #define SHUTDOWN_ACTION_STOP_STR        "stop"
64
65 struct shutdown_action {
66         char *name;
67         void (*fn) (struct shutdown_trigger *trigger);
68         int (*init) (void);
69 };
70
71 static char *ipl_type_str(enum ipl_type type)
72 {
73         switch (type) {
74         case IPL_TYPE_CCW:
75                 return IPL_CCW_STR;
76         case IPL_TYPE_FCP:
77                 return IPL_FCP_STR;
78         case IPL_TYPE_FCP_DUMP:
79                 return IPL_FCP_DUMP_STR;
80         case IPL_TYPE_NSS:
81                 return IPL_NSS_STR;
82         case IPL_TYPE_UNKNOWN:
83         default:
84                 return IPL_UNKNOWN_STR;
85         }
86 }
87
88 enum dump_type {
89         DUMP_TYPE_NONE  = 1,
90         DUMP_TYPE_CCW   = 2,
91         DUMP_TYPE_FCP   = 4,
92 };
93
94 static char *dump_type_str(enum dump_type type)
95 {
96         switch (type) {
97         case DUMP_TYPE_NONE:
98                 return DUMP_NONE_STR;
99         case DUMP_TYPE_CCW:
100                 return DUMP_CCW_STR;
101         case DUMP_TYPE_FCP:
102                 return DUMP_FCP_STR;
103         default:
104                 return NULL;
105         }
106 }
107
108 /*
109  * Must be in data section since the bss section
110  * is not cleared when these are accessed.
111  */
112 static u16 ipl_devno __attribute__((__section__(".data"))) = 0;
113 u32 ipl_flags __attribute__((__section__(".data"))) = 0;
114
115 enum ipl_method {
116         REIPL_METHOD_CCW_CIO,
117         REIPL_METHOD_CCW_DIAG,
118         REIPL_METHOD_CCW_VM,
119         REIPL_METHOD_FCP_RO_DIAG,
120         REIPL_METHOD_FCP_RW_DIAG,
121         REIPL_METHOD_FCP_RO_VM,
122         REIPL_METHOD_FCP_DUMP,
123         REIPL_METHOD_NSS,
124         REIPL_METHOD_DEFAULT,
125 };
126
127 enum dump_method {
128         DUMP_METHOD_NONE,
129         DUMP_METHOD_CCW_CIO,
130         DUMP_METHOD_CCW_DIAG,
131         DUMP_METHOD_CCW_VM,
132         DUMP_METHOD_FCP_DIAG,
133 };
134
135 static int diag308_set_works = 0;
136
137 static int reipl_capabilities = IPL_TYPE_UNKNOWN;
138
139 static enum ipl_type reipl_type = IPL_TYPE_UNKNOWN;
140 static enum ipl_method reipl_method = REIPL_METHOD_DEFAULT;
141 static struct ipl_parameter_block *reipl_block_fcp;
142 static struct ipl_parameter_block *reipl_block_ccw;
143
144 static char reipl_nss_name[NSS_NAME_SIZE + 1];
145
146 static int dump_capabilities = DUMP_TYPE_NONE;
147 static enum dump_type dump_type = DUMP_TYPE_NONE;
148 static enum dump_method dump_method = DUMP_METHOD_NONE;
149 static struct ipl_parameter_block *dump_block_fcp;
150 static struct ipl_parameter_block *dump_block_ccw;
151
152 static struct sclp_ipl_info sclp_ipl_info;
153
154 int diag308(unsigned long subcode, void *addr)
155 {
156         register unsigned long _addr asm("0") = (unsigned long) addr;
157         register unsigned long _rc asm("1") = 0;
158
159         asm volatile(
160                 "       diag    %0,%2,0x308\n"
161                 "0:\n"
162                 EX_TABLE(0b,0b)
163                 : "+d" (_addr), "+d" (_rc)
164                 : "d" (subcode) : "cc", "memory");
165         return _rc;
166 }
167 EXPORT_SYMBOL_GPL(diag308);
168
169 /* SYSFS */
170
171 #define DEFINE_IPL_ATTR_RO(_prefix, _name, _format, _value)             \
172 static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj,     \
173                 struct kobj_attribute *attr,                            \
174                 char *page)                                             \
175 {                                                                       \
176         return sprintf(page, _format, _value);                          \
177 }                                                                       \
178 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
179         __ATTR(_name, S_IRUGO, sys_##_prefix##_##_name##_show, NULL);
180
181 #define DEFINE_IPL_ATTR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)   \
182 static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj,     \
183                 struct kobj_attribute *attr,                            \
184                 char *page)                                             \
185 {                                                                       \
186         return sprintf(page, _fmt_out,                                  \
187                         (unsigned long long) _value);                   \
188 }                                                                       \
189 static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,    \
190                 struct kobj_attribute *attr,                            \
191                 const char *buf, size_t len)                            \
192 {                                                                       \
193         unsigned long long value;                                       \
194         if (sscanf(buf, _fmt_in, &value) != 1)                          \
195                 return -EINVAL;                                         \
196         _value = value;                                                 \
197         return len;                                                     \
198 }                                                                       \
199 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
200         __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
201                         sys_##_prefix##_##_name##_show,                 \
202                         sys_##_prefix##_##_name##_store);
203
204 #define DEFINE_IPL_ATTR_STR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)\
205 static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj,     \
206                 struct kobj_attribute *attr,                            \
207                 char *page)                                             \
208 {                                                                       \
209         return sprintf(page, _fmt_out, _value);                         \
210 }                                                                       \
211 static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,    \
212                 struct kobj_attribute *attr,                            \
213                 const char *buf, size_t len)                            \
214 {                                                                       \
215         strncpy(_value, buf, sizeof(_value) - 1);                       \
216         strstrip(_value);                                               \
217         return len;                                                     \
218 }                                                                       \
219 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
220         __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
221                         sys_##_prefix##_##_name##_show,                 \
222                         sys_##_prefix##_##_name##_store);
223
224 static void make_attrs_ro(struct attribute **attrs)
225 {
226         while (*attrs) {
227                 (*attrs)->mode = S_IRUGO;
228                 attrs++;
229         }
230 }
231
232 /*
233  * ipl section
234  */
235
236 static __init enum ipl_type get_ipl_type(void)
237 {
238         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
239
240         if (ipl_flags & IPL_NSS_VALID)
241                 return IPL_TYPE_NSS;
242         if (!(ipl_flags & IPL_DEVNO_VALID))
243                 return IPL_TYPE_UNKNOWN;
244         if (!(ipl_flags & IPL_PARMBLOCK_VALID))
245                 return IPL_TYPE_CCW;
246         if (ipl->hdr.version > IPL_MAX_SUPPORTED_VERSION)
247                 return IPL_TYPE_UNKNOWN;
248         if (ipl->hdr.pbt != DIAG308_IPL_TYPE_FCP)
249                 return IPL_TYPE_UNKNOWN;
250         if (ipl->ipl_info.fcp.opt == DIAG308_IPL_OPT_DUMP)
251                 return IPL_TYPE_FCP_DUMP;
252         return IPL_TYPE_FCP;
253 }
254
255 struct ipl_info ipl_info;
256 EXPORT_SYMBOL_GPL(ipl_info);
257
258 static ssize_t ipl_type_show(struct kobject *kobj, struct kobj_attribute *attr,
259                              char *page)
260 {
261         return sprintf(page, "%s\n", ipl_type_str(ipl_info.type));
262 }
263
264 static struct kobj_attribute sys_ipl_type_attr = __ATTR_RO(ipl_type);
265
266 static ssize_t sys_ipl_device_show(struct kobject *kobj,
267                                    struct kobj_attribute *attr, char *page)
268 {
269         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
270
271         switch (ipl_info.type) {
272         case IPL_TYPE_CCW:
273                 return sprintf(page, "0.0.%04x\n", ipl_devno);
274         case IPL_TYPE_FCP:
275         case IPL_TYPE_FCP_DUMP:
276                 return sprintf(page, "0.0.%04x\n", ipl->ipl_info.fcp.devno);
277         default:
278                 return 0;
279         }
280 }
281
282 static struct kobj_attribute sys_ipl_device_attr =
283         __ATTR(device, S_IRUGO, sys_ipl_device_show, NULL);
284
285 static ssize_t ipl_parameter_read(struct kobject *kobj, struct bin_attribute *attr,
286                                   char *buf, loff_t off, size_t count)
287 {
288         unsigned int size = IPL_PARMBLOCK_SIZE;
289
290         if (off > size)
291                 return 0;
292         if (off + count > size)
293                 count = size - off;
294         memcpy(buf, (void *)IPL_PARMBLOCK_START + off, count);
295         return count;
296 }
297
298 static struct bin_attribute ipl_parameter_attr = {
299         .attr = {
300                 .name = "binary_parameter",
301                 .mode = S_IRUGO,
302         },
303         .size = PAGE_SIZE,
304         .read = &ipl_parameter_read,
305 };
306
307 static ssize_t ipl_scp_data_read(struct kobject *kobj, struct bin_attribute *attr,
308                                  char *buf, loff_t off, size_t count)
309 {
310         unsigned int size = IPL_PARMBLOCK_START->ipl_info.fcp.scp_data_len;
311         void *scp_data = &IPL_PARMBLOCK_START->ipl_info.fcp.scp_data;
312
313         if (off > size)
314                 return 0;
315         if (off + count > size)
316                 count = size - off;
317         memcpy(buf, scp_data + off, count);
318         return count;
319 }
320
321 static struct bin_attribute ipl_scp_data_attr = {
322         .attr = {
323                 .name = "scp_data",
324                 .mode = S_IRUGO,
325         },
326         .size = PAGE_SIZE,
327         .read = ipl_scp_data_read,
328 };
329
330 /* FCP ipl device attributes */
331
332 DEFINE_IPL_ATTR_RO(ipl_fcp, wwpn, "0x%016llx\n", (unsigned long long)
333                    IPL_PARMBLOCK_START->ipl_info.fcp.wwpn);
334 DEFINE_IPL_ATTR_RO(ipl_fcp, lun, "0x%016llx\n", (unsigned long long)
335                    IPL_PARMBLOCK_START->ipl_info.fcp.lun);
336 DEFINE_IPL_ATTR_RO(ipl_fcp, bootprog, "%lld\n", (unsigned long long)
337                    IPL_PARMBLOCK_START->ipl_info.fcp.bootprog);
338 DEFINE_IPL_ATTR_RO(ipl_fcp, br_lba, "%lld\n", (unsigned long long)
339                    IPL_PARMBLOCK_START->ipl_info.fcp.br_lba);
340
341 static struct attribute *ipl_fcp_attrs[] = {
342         &sys_ipl_type_attr.attr,
343         &sys_ipl_device_attr.attr,
344         &sys_ipl_fcp_wwpn_attr.attr,
345         &sys_ipl_fcp_lun_attr.attr,
346         &sys_ipl_fcp_bootprog_attr.attr,
347         &sys_ipl_fcp_br_lba_attr.attr,
348         NULL,
349 };
350
351 static struct attribute_group ipl_fcp_attr_group = {
352         .attrs = ipl_fcp_attrs,
353 };
354
355 /* CCW ipl device attributes */
356
357 static ssize_t ipl_ccw_loadparm_show(struct kobject *kobj,
358                                      struct kobj_attribute *attr, char *page)
359 {
360         char loadparm[LOADPARM_LEN + 1] = {};
361
362         if (!sclp_ipl_info.is_valid)
363                 return sprintf(page, "#unknown#\n");
364         memcpy(loadparm, &sclp_ipl_info.loadparm, LOADPARM_LEN);
365         EBCASC(loadparm, LOADPARM_LEN);
366         strstrip(loadparm);
367         return sprintf(page, "%s\n", loadparm);
368 }
369
370 static struct kobj_attribute sys_ipl_ccw_loadparm_attr =
371         __ATTR(loadparm, 0444, ipl_ccw_loadparm_show, NULL);
372
373 static struct attribute *ipl_ccw_attrs[] = {
374         &sys_ipl_type_attr.attr,
375         &sys_ipl_device_attr.attr,
376         &sys_ipl_ccw_loadparm_attr.attr,
377         NULL,
378 };
379
380 static struct attribute_group ipl_ccw_attr_group = {
381         .attrs = ipl_ccw_attrs,
382 };
383
384 /* NSS ipl device attributes */
385
386 DEFINE_IPL_ATTR_RO(ipl_nss, name, "%s\n", kernel_nss_name);
387
388 static struct attribute *ipl_nss_attrs[] = {
389         &sys_ipl_type_attr.attr,
390         &sys_ipl_nss_name_attr.attr,
391         NULL,
392 };
393
394 static struct attribute_group ipl_nss_attr_group = {
395         .attrs = ipl_nss_attrs,
396 };
397
398 /* UNKNOWN ipl device attributes */
399
400 static struct attribute *ipl_unknown_attrs[] = {
401         &sys_ipl_type_attr.attr,
402         NULL,
403 };
404
405 static struct attribute_group ipl_unknown_attr_group = {
406         .attrs = ipl_unknown_attrs,
407 };
408
409 static struct kset *ipl_kset;
410
411 static int __init ipl_register_fcp_files(void)
412 {
413         int rc;
414
415         rc = sysfs_create_group(&ipl_kset->kobj, &ipl_fcp_attr_group);
416         if (rc)
417                 goto out;
418         rc = sysfs_create_bin_file(&ipl_kset->kobj, &ipl_parameter_attr);
419         if (rc)
420                 goto out_ipl_parm;
421         rc = sysfs_create_bin_file(&ipl_kset->kobj, &ipl_scp_data_attr);
422         if (!rc)
423                 goto out;
424
425         sysfs_remove_bin_file(&ipl_kset->kobj, &ipl_parameter_attr);
426
427 out_ipl_parm:
428         sysfs_remove_group(&ipl_kset->kobj, &ipl_fcp_attr_group);
429 out:
430         return rc;
431 }
432
433 static void ipl_run(struct shutdown_trigger *trigger)
434 {
435         diag308(DIAG308_IPL, NULL);
436         if (MACHINE_IS_VM)
437                 __cpcmd("IPL", NULL, 0, NULL);
438         else if (ipl_info.type == IPL_TYPE_CCW)
439                 reipl_ccw_dev(&ipl_info.data.ccw.dev_id);
440 }
441
442 static int __init ipl_init(void)
443 {
444         int rc;
445
446         ipl_kset = kset_create_and_add("ipl", NULL, firmware_kobj);
447         if (!ipl_kset) {
448                 rc = -ENOMEM;
449                 goto out;
450         }
451         switch (ipl_info.type) {
452         case IPL_TYPE_CCW:
453                 rc = sysfs_create_group(&ipl_kset->kobj, &ipl_ccw_attr_group);
454                 break;
455         case IPL_TYPE_FCP:
456         case IPL_TYPE_FCP_DUMP:
457                 rc = ipl_register_fcp_files();
458                 break;
459         case IPL_TYPE_NSS:
460                 rc = sysfs_create_group(&ipl_kset->kobj, &ipl_nss_attr_group);
461                 break;
462         default:
463                 rc = sysfs_create_group(&ipl_kset->kobj,
464                                         &ipl_unknown_attr_group);
465                 break;
466         }
467 out:
468         if (rc)
469                 panic("ipl_init failed: rc = %i\n", rc);
470
471         return 0;
472 }
473
474 static struct shutdown_action __refdata ipl_action = {
475         .name   = SHUTDOWN_ACTION_IPL_STR,
476         .fn     = ipl_run,
477         .init   = ipl_init,
478 };
479
480 /*
481  * reipl shutdown action: Reboot Linux on shutdown.
482  */
483
484 /* FCP reipl device attributes */
485
486 DEFINE_IPL_ATTR_RW(reipl_fcp, wwpn, "0x%016llx\n", "%016llx\n",
487                    reipl_block_fcp->ipl_info.fcp.wwpn);
488 DEFINE_IPL_ATTR_RW(reipl_fcp, lun, "0x%016llx\n", "%016llx\n",
489                    reipl_block_fcp->ipl_info.fcp.lun);
490 DEFINE_IPL_ATTR_RW(reipl_fcp, bootprog, "%lld\n", "%lld\n",
491                    reipl_block_fcp->ipl_info.fcp.bootprog);
492 DEFINE_IPL_ATTR_RW(reipl_fcp, br_lba, "%lld\n", "%lld\n",
493                    reipl_block_fcp->ipl_info.fcp.br_lba);
494 DEFINE_IPL_ATTR_RW(reipl_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
495                    reipl_block_fcp->ipl_info.fcp.devno);
496
497 static struct attribute *reipl_fcp_attrs[] = {
498         &sys_reipl_fcp_device_attr.attr,
499         &sys_reipl_fcp_wwpn_attr.attr,
500         &sys_reipl_fcp_lun_attr.attr,
501         &sys_reipl_fcp_bootprog_attr.attr,
502         &sys_reipl_fcp_br_lba_attr.attr,
503         NULL,
504 };
505
506 static struct attribute_group reipl_fcp_attr_group = {
507         .name  = IPL_FCP_STR,
508         .attrs = reipl_fcp_attrs,
509 };
510
511 /* CCW reipl device attributes */
512
513 DEFINE_IPL_ATTR_RW(reipl_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
514         reipl_block_ccw->ipl_info.ccw.devno);
515
516 static void reipl_get_ascii_loadparm(char *loadparm)
517 {
518         memcpy(loadparm, &reipl_block_ccw->ipl_info.ccw.load_param,
519                LOADPARM_LEN);
520         EBCASC(loadparm, LOADPARM_LEN);
521         loadparm[LOADPARM_LEN] = 0;
522         strstrip(loadparm);
523 }
524
525 static ssize_t reipl_ccw_loadparm_show(struct kobject *kobj,
526                                        struct kobj_attribute *attr, char *page)
527 {
528         char buf[LOADPARM_LEN + 1];
529
530         reipl_get_ascii_loadparm(buf);
531         return sprintf(page, "%s\n", buf);
532 }
533
534 static ssize_t reipl_ccw_loadparm_store(struct kobject *kobj,
535                                         struct kobj_attribute *attr,
536                                         const char *buf, size_t len)
537 {
538         int i, lp_len;
539
540         /* ignore trailing newline */
541         lp_len = len;
542         if ((len > 0) && (buf[len - 1] == '\n'))
543                 lp_len--;
544         /* loadparm can have max 8 characters and must not start with a blank */
545         if ((lp_len > LOADPARM_LEN) || ((lp_len > 0) && (buf[0] == ' ')))
546                 return -EINVAL;
547         /* loadparm can only contain "a-z,A-Z,0-9,SP,." */
548         for (i = 0; i < lp_len; i++) {
549                 if (isalpha(buf[i]) || isdigit(buf[i]) || (buf[i] == ' ') ||
550                     (buf[i] == '.'))
551                         continue;
552                 return -EINVAL;
553         }
554         /* initialize loadparm with blanks */
555         memset(&reipl_block_ccw->ipl_info.ccw.load_param, ' ', LOADPARM_LEN);
556         /* copy and convert to ebcdic */
557         memcpy(&reipl_block_ccw->ipl_info.ccw.load_param, buf, lp_len);
558         ASCEBC(reipl_block_ccw->ipl_info.ccw.load_param, LOADPARM_LEN);
559         return len;
560 }
561
562 static struct kobj_attribute sys_reipl_ccw_loadparm_attr =
563         __ATTR(loadparm, 0644, reipl_ccw_loadparm_show,
564                reipl_ccw_loadparm_store);
565
566 static struct attribute *reipl_ccw_attrs[] = {
567         &sys_reipl_ccw_device_attr.attr,
568         &sys_reipl_ccw_loadparm_attr.attr,
569         NULL,
570 };
571
572 static struct attribute_group reipl_ccw_attr_group = {
573         .name  = IPL_CCW_STR,
574         .attrs = reipl_ccw_attrs,
575 };
576
577
578 /* NSS reipl device attributes */
579
580 DEFINE_IPL_ATTR_STR_RW(reipl_nss, name, "%s\n", "%s\n", reipl_nss_name);
581
582 static struct attribute *reipl_nss_attrs[] = {
583         &sys_reipl_nss_name_attr.attr,
584         NULL,
585 };
586
587 static struct attribute_group reipl_nss_attr_group = {
588         .name  = IPL_NSS_STR,
589         .attrs = reipl_nss_attrs,
590 };
591
592 /* reipl type */
593
594 static int reipl_set_type(enum ipl_type type)
595 {
596         if (!(reipl_capabilities & type))
597                 return -EINVAL;
598
599         switch(type) {
600         case IPL_TYPE_CCW:
601                 if (diag308_set_works)
602                         reipl_method = REIPL_METHOD_CCW_DIAG;
603                 else if (MACHINE_IS_VM)
604                         reipl_method = REIPL_METHOD_CCW_VM;
605                 else
606                         reipl_method = REIPL_METHOD_CCW_CIO;
607                 break;
608         case IPL_TYPE_FCP:
609                 if (diag308_set_works)
610                         reipl_method = REIPL_METHOD_FCP_RW_DIAG;
611                 else if (MACHINE_IS_VM)
612                         reipl_method = REIPL_METHOD_FCP_RO_VM;
613                 else
614                         reipl_method = REIPL_METHOD_FCP_RO_DIAG;
615                 break;
616         case IPL_TYPE_FCP_DUMP:
617                 reipl_method = REIPL_METHOD_FCP_DUMP;
618                 break;
619         case IPL_TYPE_NSS:
620                 reipl_method = REIPL_METHOD_NSS;
621                 break;
622         case IPL_TYPE_UNKNOWN:
623                 reipl_method = REIPL_METHOD_DEFAULT;
624                 break;
625         default:
626                 BUG();
627         }
628         reipl_type = type;
629         return 0;
630 }
631
632 static ssize_t reipl_type_show(struct kobject *kobj,
633                                struct kobj_attribute *attr, char *page)
634 {
635         return sprintf(page, "%s\n", ipl_type_str(reipl_type));
636 }
637
638 static ssize_t reipl_type_store(struct kobject *kobj,
639                                 struct kobj_attribute *attr,
640                                 const char *buf, size_t len)
641 {
642         int rc = -EINVAL;
643
644         if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
645                 rc = reipl_set_type(IPL_TYPE_CCW);
646         else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
647                 rc = reipl_set_type(IPL_TYPE_FCP);
648         else if (strncmp(buf, IPL_NSS_STR, strlen(IPL_NSS_STR)) == 0)
649                 rc = reipl_set_type(IPL_TYPE_NSS);
650         return (rc != 0) ? rc : len;
651 }
652
653 static struct kobj_attribute reipl_type_attr =
654         __ATTR(reipl_type, 0644, reipl_type_show, reipl_type_store);
655
656 static struct kset *reipl_kset;
657
658 void reipl_run(struct shutdown_trigger *trigger)
659 {
660         struct ccw_dev_id devid;
661         static char buf[100];
662         char loadparm[LOADPARM_LEN + 1];
663
664         switch (reipl_method) {
665         case REIPL_METHOD_CCW_CIO:
666                 devid.devno = reipl_block_ccw->ipl_info.ccw.devno;
667                 devid.ssid  = 0;
668                 reipl_ccw_dev(&devid);
669                 break;
670         case REIPL_METHOD_CCW_VM:
671                 reipl_get_ascii_loadparm(loadparm);
672                 if (strlen(loadparm) == 0)
673                         sprintf(buf, "IPL %X CLEAR",
674                                 reipl_block_ccw->ipl_info.ccw.devno);
675                 else
676                         sprintf(buf, "IPL %X CLEAR LOADPARM '%s'",
677                                 reipl_block_ccw->ipl_info.ccw.devno, loadparm);
678                 __cpcmd(buf, NULL, 0, NULL);
679                 break;
680         case REIPL_METHOD_CCW_DIAG:
681                 diag308(DIAG308_SET, reipl_block_ccw);
682                 diag308(DIAG308_IPL, NULL);
683                 break;
684         case REIPL_METHOD_FCP_RW_DIAG:
685                 diag308(DIAG308_SET, reipl_block_fcp);
686                 diag308(DIAG308_IPL, NULL);
687                 break;
688         case REIPL_METHOD_FCP_RO_DIAG:
689                 diag308(DIAG308_IPL, NULL);
690                 break;
691         case REIPL_METHOD_FCP_RO_VM:
692                 __cpcmd("IPL", NULL, 0, NULL);
693                 break;
694         case REIPL_METHOD_NSS:
695                 sprintf(buf, "IPL %s", reipl_nss_name);
696                 __cpcmd(buf, NULL, 0, NULL);
697                 break;
698         case REIPL_METHOD_DEFAULT:
699                 if (MACHINE_IS_VM)
700                         __cpcmd("IPL", NULL, 0, NULL);
701                 diag308(DIAG308_IPL, NULL);
702                 break;
703         case REIPL_METHOD_FCP_DUMP:
704         default:
705                 break;
706         }
707 }
708
709 static void __init reipl_probe(void)
710 {
711         void *buffer;
712
713         buffer = (void *) get_zeroed_page(GFP_KERNEL);
714         if (!buffer)
715                 return;
716         if (diag308(DIAG308_STORE, buffer) == DIAG308_RC_OK)
717                 diag308_set_works = 1;
718         free_page((unsigned long)buffer);
719 }
720
721 static int __init reipl_nss_init(void)
722 {
723         int rc;
724
725         if (!MACHINE_IS_VM)
726                 return 0;
727         rc = sysfs_create_group(&reipl_kset->kobj, &reipl_nss_attr_group);
728         if (rc)
729                 return rc;
730         strncpy(reipl_nss_name, kernel_nss_name, NSS_NAME_SIZE + 1);
731         reipl_capabilities |= IPL_TYPE_NSS;
732         return 0;
733 }
734
735 static int __init reipl_ccw_init(void)
736 {
737         int rc;
738
739         reipl_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
740         if (!reipl_block_ccw)
741                 return -ENOMEM;
742         rc = sysfs_create_group(&reipl_kset->kobj, &reipl_ccw_attr_group);
743         if (rc) {
744                 free_page((unsigned long)reipl_block_ccw);
745                 return rc;
746         }
747         reipl_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
748         reipl_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
749         reipl_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
750         reipl_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
751         reipl_block_ccw->hdr.flags = DIAG308_FLAGS_LP_VALID;
752         /* check if read scp info worked and set loadparm */
753         if (sclp_ipl_info.is_valid)
754                 memcpy(reipl_block_ccw->ipl_info.ccw.load_param,
755                        &sclp_ipl_info.loadparm, LOADPARM_LEN);
756         else
757                 /* read scp info failed: set empty loadparm (EBCDIC blanks) */
758                 memset(reipl_block_ccw->ipl_info.ccw.load_param, 0x40,
759                        LOADPARM_LEN);
760         if (!MACHINE_IS_VM && !diag308_set_works)
761                 sys_reipl_ccw_loadparm_attr.attr.mode = S_IRUGO;
762         if (ipl_info.type == IPL_TYPE_CCW)
763                 reipl_block_ccw->ipl_info.ccw.devno = ipl_devno;
764         reipl_capabilities |= IPL_TYPE_CCW;
765         return 0;
766 }
767
768 static int __init reipl_fcp_init(void)
769 {
770         int rc;
771
772         if ((!diag308_set_works) && (ipl_info.type != IPL_TYPE_FCP))
773                 return 0;
774         if ((!diag308_set_works) && (ipl_info.type == IPL_TYPE_FCP))
775                 make_attrs_ro(reipl_fcp_attrs);
776
777         reipl_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
778         if (!reipl_block_fcp)
779                 return -ENOMEM;
780         rc = sysfs_create_group(&reipl_kset->kobj, &reipl_fcp_attr_group);
781         if (rc) {
782                 free_page((unsigned long)reipl_block_fcp);
783                 return rc;
784         }
785         if (ipl_info.type == IPL_TYPE_FCP) {
786                 memcpy(reipl_block_fcp, IPL_PARMBLOCK_START, PAGE_SIZE);
787         } else {
788                 reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
789                 reipl_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
790                 reipl_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
791                 reipl_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
792                 reipl_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_IPL;
793         }
794         reipl_capabilities |= IPL_TYPE_FCP;
795         return 0;
796 }
797
798 static int __init reipl_init(void)
799 {
800         int rc;
801
802         reipl_kset = kset_create_and_add("reipl", NULL, firmware_kobj);
803         if (!reipl_kset)
804                 return -ENOMEM;
805         rc = sysfs_create_file(&reipl_kset->kobj, &reipl_type_attr.attr);
806         if (rc) {
807                 kset_unregister(reipl_kset);
808                 return rc;
809         }
810         rc = reipl_ccw_init();
811         if (rc)
812                 return rc;
813         rc = reipl_fcp_init();
814         if (rc)
815                 return rc;
816         rc = reipl_nss_init();
817         if (rc)
818                 return rc;
819         rc = reipl_set_type(ipl_info.type);
820         if (rc)
821                 return rc;
822         return 0;
823 }
824
825 static struct shutdown_action __refdata reipl_action = {
826         .name   = SHUTDOWN_ACTION_REIPL_STR,
827         .fn     = reipl_run,
828         .init   = reipl_init,
829 };
830
831 /*
832  * dump shutdown action: Dump Linux on shutdown.
833  */
834
835 /* FCP dump device attributes */
836
837 DEFINE_IPL_ATTR_RW(dump_fcp, wwpn, "0x%016llx\n", "%016llx\n",
838                    dump_block_fcp->ipl_info.fcp.wwpn);
839 DEFINE_IPL_ATTR_RW(dump_fcp, lun, "0x%016llx\n", "%016llx\n",
840                    dump_block_fcp->ipl_info.fcp.lun);
841 DEFINE_IPL_ATTR_RW(dump_fcp, bootprog, "%lld\n", "%lld\n",
842                    dump_block_fcp->ipl_info.fcp.bootprog);
843 DEFINE_IPL_ATTR_RW(dump_fcp, br_lba, "%lld\n", "%lld\n",
844                    dump_block_fcp->ipl_info.fcp.br_lba);
845 DEFINE_IPL_ATTR_RW(dump_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
846                    dump_block_fcp->ipl_info.fcp.devno);
847
848 static struct attribute *dump_fcp_attrs[] = {
849         &sys_dump_fcp_device_attr.attr,
850         &sys_dump_fcp_wwpn_attr.attr,
851         &sys_dump_fcp_lun_attr.attr,
852         &sys_dump_fcp_bootprog_attr.attr,
853         &sys_dump_fcp_br_lba_attr.attr,
854         NULL,
855 };
856
857 static struct attribute_group dump_fcp_attr_group = {
858         .name  = IPL_FCP_STR,
859         .attrs = dump_fcp_attrs,
860 };
861
862 /* CCW dump device attributes */
863
864 DEFINE_IPL_ATTR_RW(dump_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
865                    dump_block_ccw->ipl_info.ccw.devno);
866
867 static struct attribute *dump_ccw_attrs[] = {
868         &sys_dump_ccw_device_attr.attr,
869         NULL,
870 };
871
872 static struct attribute_group dump_ccw_attr_group = {
873         .name  = IPL_CCW_STR,
874         .attrs = dump_ccw_attrs,
875 };
876
877 /* dump type */
878
879 static int dump_set_type(enum dump_type type)
880 {
881         if (!(dump_capabilities & type))
882                 return -EINVAL;
883         switch (type) {
884         case DUMP_TYPE_CCW:
885                 if (diag308_set_works)
886                         dump_method = DUMP_METHOD_CCW_DIAG;
887                 else if (MACHINE_IS_VM)
888                         dump_method = DUMP_METHOD_CCW_VM;
889                 else
890                         dump_method = DUMP_METHOD_CCW_CIO;
891                 break;
892         case DUMP_TYPE_FCP:
893                 dump_method = DUMP_METHOD_FCP_DIAG;
894                 break;
895         default:
896                 dump_method = DUMP_METHOD_NONE;
897         }
898         dump_type = type;
899         return 0;
900 }
901
902 static ssize_t dump_type_show(struct kobject *kobj,
903                               struct kobj_attribute *attr, char *page)
904 {
905         return sprintf(page, "%s\n", dump_type_str(dump_type));
906 }
907
908 static ssize_t dump_type_store(struct kobject *kobj,
909                                struct kobj_attribute *attr,
910                                const char *buf, size_t len)
911 {
912         int rc = -EINVAL;
913
914         if (strncmp(buf, DUMP_NONE_STR, strlen(DUMP_NONE_STR)) == 0)
915                 rc = dump_set_type(DUMP_TYPE_NONE);
916         else if (strncmp(buf, DUMP_CCW_STR, strlen(DUMP_CCW_STR)) == 0)
917                 rc = dump_set_type(DUMP_TYPE_CCW);
918         else if (strncmp(buf, DUMP_FCP_STR, strlen(DUMP_FCP_STR)) == 0)
919                 rc = dump_set_type(DUMP_TYPE_FCP);
920         return (rc != 0) ? rc : len;
921 }
922
923 static struct kobj_attribute dump_type_attr =
924         __ATTR(dump_type, 0644, dump_type_show, dump_type_store);
925
926 static struct kset *dump_kset;
927
928 static void dump_run(struct shutdown_trigger *trigger)
929 {
930         struct ccw_dev_id devid;
931         static char buf[100];
932
933         switch (dump_method) {
934         case DUMP_METHOD_CCW_CIO:
935                 smp_send_stop();
936                 devid.devno = dump_block_ccw->ipl_info.ccw.devno;
937                 devid.ssid  = 0;
938                 reipl_ccw_dev(&devid);
939                 break;
940         case DUMP_METHOD_CCW_VM:
941                 smp_send_stop();
942                 sprintf(buf, "STORE STATUS");
943                 __cpcmd(buf, NULL, 0, NULL);
944                 sprintf(buf, "IPL %X", dump_block_ccw->ipl_info.ccw.devno);
945                 __cpcmd(buf, NULL, 0, NULL);
946                 break;
947         case DUMP_METHOD_CCW_DIAG:
948                 diag308(DIAG308_SET, dump_block_ccw);
949                 diag308(DIAG308_DUMP, NULL);
950                 break;
951         case DUMP_METHOD_FCP_DIAG:
952                 diag308(DIAG308_SET, dump_block_fcp);
953                 diag308(DIAG308_DUMP, NULL);
954                 break;
955         case DUMP_METHOD_NONE:
956         default:
957                 return;
958         }
959         printk(KERN_EMERG "Dump failed!\n");
960 }
961
962 static int __init dump_ccw_init(void)
963 {
964         int rc;
965
966         dump_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
967         if (!dump_block_ccw)
968                 return -ENOMEM;
969         rc = sysfs_create_group(&dump_kset->kobj, &dump_ccw_attr_group);
970         if (rc) {
971                 free_page((unsigned long)dump_block_ccw);
972                 return rc;
973         }
974         dump_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
975         dump_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
976         dump_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
977         dump_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
978         dump_capabilities |= DUMP_TYPE_CCW;
979         return 0;
980 }
981
982 static int __init dump_fcp_init(void)
983 {
984         int rc;
985
986         if (!sclp_ipl_info.has_dump)
987                 return 0; /* LDIPL DUMP is not installed */
988         if (!diag308_set_works)
989                 return 0;
990         dump_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
991         if (!dump_block_fcp)
992                 return -ENOMEM;
993         rc = sysfs_create_group(&dump_kset->kobj, &dump_fcp_attr_group);
994         if (rc) {
995                 free_page((unsigned long)dump_block_fcp);
996                 return rc;
997         }
998         dump_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
999         dump_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
1000         dump_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
1001         dump_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
1002         dump_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_DUMP;
1003         dump_capabilities |= DUMP_TYPE_FCP;
1004         return 0;
1005 }
1006
1007 static int __init dump_init(void)
1008 {
1009         int rc;
1010
1011         dump_kset = kset_create_and_add("dump", NULL, firmware_kobj);
1012         if (!dump_kset)
1013                 return -ENOMEM;
1014         rc = sysfs_create_file(&dump_kset->kobj, &dump_type_attr.attr);
1015         if (rc) {
1016                 kset_unregister(dump_kset);
1017                 return rc;
1018         }
1019         rc = dump_ccw_init();
1020         if (rc)
1021                 return rc;
1022         rc = dump_fcp_init();
1023         if (rc)
1024                 return rc;
1025         dump_set_type(DUMP_TYPE_NONE);
1026         return 0;
1027 }
1028
1029 static struct shutdown_action __refdata dump_action = {
1030         .name   = SHUTDOWN_ACTION_DUMP_STR,
1031         .fn     = dump_run,
1032         .init   = dump_init,
1033 };
1034
1035 /*
1036  * vmcmd shutdown action: Trigger vm command on shutdown.
1037  */
1038
1039 static char vmcmd_on_reboot[128];
1040 static char vmcmd_on_panic[128];
1041 static char vmcmd_on_halt[128];
1042 static char vmcmd_on_poff[128];
1043
1044 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_reboot, "%s\n", "%s\n", vmcmd_on_reboot);
1045 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_panic, "%s\n", "%s\n", vmcmd_on_panic);
1046 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_halt, "%s\n", "%s\n", vmcmd_on_halt);
1047 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_poff, "%s\n", "%s\n", vmcmd_on_poff);
1048
1049 static struct attribute *vmcmd_attrs[] = {
1050         &sys_vmcmd_on_reboot_attr.attr,
1051         &sys_vmcmd_on_panic_attr.attr,
1052         &sys_vmcmd_on_halt_attr.attr,
1053         &sys_vmcmd_on_poff_attr.attr,
1054         NULL,
1055 };
1056
1057 static struct attribute_group vmcmd_attr_group = {
1058         .attrs = vmcmd_attrs,
1059 };
1060
1061 static struct kset *vmcmd_kset;
1062
1063 static void vmcmd_run(struct shutdown_trigger *trigger)
1064 {
1065         char *cmd, *next_cmd;
1066
1067         if (strcmp(trigger->name, ON_REIPL_STR) == 0)
1068                 cmd = vmcmd_on_reboot;
1069         else if (strcmp(trigger->name, ON_PANIC_STR) == 0)
1070                 cmd = vmcmd_on_panic;
1071         else if (strcmp(trigger->name, ON_HALT_STR) == 0)
1072                 cmd = vmcmd_on_halt;
1073         else if (strcmp(trigger->name, ON_POFF_STR) == 0)
1074                 cmd = vmcmd_on_poff;
1075         else
1076                 return;
1077
1078         if (strlen(cmd) == 0)
1079                 return;
1080         do {
1081                 next_cmd = strchr(cmd, '\n');
1082                 if (next_cmd) {
1083                         next_cmd[0] = 0;
1084                         next_cmd += 1;
1085                 }
1086                 __cpcmd(cmd, NULL, 0, NULL);
1087                 cmd = next_cmd;
1088         } while (cmd != NULL);
1089 }
1090
1091 static int vmcmd_init(void)
1092 {
1093         if (!MACHINE_IS_VM)
1094                 return -ENOTSUPP;
1095         vmcmd_kset = kset_create_and_add("vmcmd", NULL, firmware_kobj);
1096         if (!vmcmd_kset)
1097                 return -ENOMEM;
1098         return sysfs_create_group(&vmcmd_kset->kobj, &vmcmd_attr_group);
1099 }
1100
1101 static struct shutdown_action vmcmd_action = {SHUTDOWN_ACTION_VMCMD_STR,
1102                                               vmcmd_run, vmcmd_init};
1103
1104 /*
1105  * stop shutdown action: Stop Linux on shutdown.
1106  */
1107
1108 static void stop_run(struct shutdown_trigger *trigger)
1109 {
1110         if (strcmp(trigger->name, ON_PANIC_STR) == 0)
1111                 disabled_wait((unsigned long) __builtin_return_address(0));
1112         else {
1113                 signal_processor(smp_processor_id(), sigp_stop);
1114                 for (;;);
1115         }
1116 }
1117
1118 static struct shutdown_action stop_action = {SHUTDOWN_ACTION_STOP_STR,
1119                                              stop_run, NULL};
1120
1121 /* action list */
1122
1123 static struct shutdown_action *shutdown_actions_list[] = {
1124         &ipl_action, &reipl_action, &dump_action, &vmcmd_action, &stop_action};
1125 #define SHUTDOWN_ACTIONS_COUNT (sizeof(shutdown_actions_list) / sizeof(void *))
1126
1127 /*
1128  * Trigger section
1129  */
1130
1131 static struct kset *shutdown_actions_kset;
1132
1133 static int set_trigger(const char *buf, struct shutdown_trigger *trigger,
1134                        size_t len)
1135 {
1136         int i;
1137         for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
1138                 if (!shutdown_actions_list[i])
1139                         continue;
1140                 if (strncmp(buf, shutdown_actions_list[i]->name,
1141                             strlen(shutdown_actions_list[i]->name)) == 0) {
1142                         trigger->action = shutdown_actions_list[i];
1143                         return len;
1144                 }
1145         }
1146         return -EINVAL;
1147 }
1148
1149 /* on reipl */
1150
1151 static struct shutdown_trigger on_reboot_trigger = {ON_REIPL_STR,
1152                                                     &reipl_action};
1153
1154 static ssize_t on_reboot_show(struct kobject *kobj,
1155                               struct kobj_attribute *attr, char *page)
1156 {
1157         return sprintf(page, "%s\n", on_reboot_trigger.action->name);
1158 }
1159
1160 static ssize_t on_reboot_store(struct kobject *kobj,
1161                                struct kobj_attribute *attr,
1162                                const char *buf, size_t len)
1163 {
1164         return set_trigger(buf, &on_reboot_trigger, len);
1165 }
1166
1167 static struct kobj_attribute on_reboot_attr =
1168         __ATTR(on_reboot, 0644, on_reboot_show, on_reboot_store);
1169
1170 static void do_machine_restart(char *__unused)
1171 {
1172         smp_send_stop();
1173         on_reboot_trigger.action->fn(&on_reboot_trigger);
1174         reipl_run(NULL);
1175 }
1176 void (*_machine_restart)(char *command) = do_machine_restart;
1177
1178 /* on panic */
1179
1180 static struct shutdown_trigger on_panic_trigger = {ON_PANIC_STR, &stop_action};
1181
1182 static ssize_t on_panic_show(struct kobject *kobj,
1183                              struct kobj_attribute *attr, char *page)
1184 {
1185         return sprintf(page, "%s\n", on_panic_trigger.action->name);
1186 }
1187
1188 static ssize_t on_panic_store(struct kobject *kobj,
1189                               struct kobj_attribute *attr,
1190                               const char *buf, size_t len)
1191 {
1192         return set_trigger(buf, &on_panic_trigger, len);
1193 }
1194
1195 static struct kobj_attribute on_panic_attr =
1196         __ATTR(on_panic, 0644, on_panic_show, on_panic_store);
1197
1198 static void do_panic(void)
1199 {
1200         on_panic_trigger.action->fn(&on_panic_trigger);
1201         stop_run(&on_panic_trigger);
1202 }
1203
1204 /* on halt */
1205
1206 static struct shutdown_trigger on_halt_trigger = {ON_HALT_STR, &stop_action};
1207
1208 static ssize_t on_halt_show(struct kobject *kobj,
1209                             struct kobj_attribute *attr, char *page)
1210 {
1211         return sprintf(page, "%s\n", on_halt_trigger.action->name);
1212 }
1213
1214 static ssize_t on_halt_store(struct kobject *kobj,
1215                              struct kobj_attribute *attr,
1216                              const char *buf, size_t len)
1217 {
1218         return set_trigger(buf, &on_halt_trigger, len);
1219 }
1220
1221 static struct kobj_attribute on_halt_attr =
1222         __ATTR(on_halt, 0644, on_halt_show, on_halt_store);
1223
1224
1225 static void do_machine_halt(void)
1226 {
1227         smp_send_stop();
1228         on_halt_trigger.action->fn(&on_halt_trigger);
1229         stop_run(&on_halt_trigger);
1230 }
1231 void (*_machine_halt)(void) = do_machine_halt;
1232
1233 /* on power off */
1234
1235 static struct shutdown_trigger on_poff_trigger = {ON_POFF_STR, &stop_action};
1236
1237 static ssize_t on_poff_show(struct kobject *kobj,
1238                             struct kobj_attribute *attr, char *page)
1239 {
1240         return sprintf(page, "%s\n", on_poff_trigger.action->name);
1241 }
1242
1243 static ssize_t on_poff_store(struct kobject *kobj,
1244                              struct kobj_attribute *attr,
1245                              const char *buf, size_t len)
1246 {
1247         return set_trigger(buf, &on_poff_trigger, len);
1248 }
1249
1250 static struct kobj_attribute on_poff_attr =
1251         __ATTR(on_poff, 0644, on_poff_show, on_poff_store);
1252
1253
1254 static void do_machine_power_off(void)
1255 {
1256         smp_send_stop();
1257         on_poff_trigger.action->fn(&on_poff_trigger);
1258         stop_run(&on_poff_trigger);
1259 }
1260 void (*_machine_power_off)(void) = do_machine_power_off;
1261
1262 static void __init shutdown_triggers_init(void)
1263 {
1264         shutdown_actions_kset = kset_create_and_add("shutdown_actions", NULL,
1265                                                     firmware_kobj);
1266         if (!shutdown_actions_kset)
1267                 goto fail;
1268         if (sysfs_create_file(&shutdown_actions_kset->kobj,
1269                               &on_reboot_attr.attr))
1270                 goto fail;
1271         if (sysfs_create_file(&shutdown_actions_kset->kobj,
1272                               &on_panic_attr.attr))
1273                 goto fail;
1274         if (sysfs_create_file(&shutdown_actions_kset->kobj,
1275                               &on_halt_attr.attr))
1276                 goto fail;
1277         if (sysfs_create_file(&shutdown_actions_kset->kobj,
1278                               &on_poff_attr.attr))
1279                 goto fail;
1280
1281         return;
1282 fail:
1283         panic("shutdown_triggers_init failed\n");
1284 }
1285
1286 static void __init shutdown_actions_init(void)
1287 {
1288         int i;
1289
1290         for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
1291                 if (!shutdown_actions_list[i]->init)
1292                         continue;
1293                 if (shutdown_actions_list[i]->init())
1294                         shutdown_actions_list[i] = NULL;
1295         }
1296 }
1297
1298 static int __init s390_ipl_init(void)
1299 {
1300         reipl_probe();
1301         sclp_get_ipl_info(&sclp_ipl_info);
1302         shutdown_actions_init();
1303         shutdown_triggers_init();
1304         return 0;
1305 }
1306
1307 __initcall(s390_ipl_init);
1308
1309 static void __init strncpy_skip_quote(char *dst, char *src, int n)
1310 {
1311         int sx, dx;
1312
1313         dx = 0;
1314         for (sx = 0; src[sx] != 0; sx++) {
1315                 if (src[sx] == '"')
1316                         continue;
1317                 dst[dx++] = src[sx];
1318                 if (dx >= n)
1319                         break;
1320         }
1321 }
1322
1323 static int __init vmcmd_on_reboot_setup(char *str)
1324 {
1325         if (!MACHINE_IS_VM)
1326                 return 1;
1327         strncpy_skip_quote(vmcmd_on_reboot, str, 127);
1328         vmcmd_on_reboot[127] = 0;
1329         on_reboot_trigger.action = &vmcmd_action;
1330         return 1;
1331 }
1332 __setup("vmreboot=", vmcmd_on_reboot_setup);
1333
1334 static int __init vmcmd_on_panic_setup(char *str)
1335 {
1336         if (!MACHINE_IS_VM)
1337                 return 1;
1338         strncpy_skip_quote(vmcmd_on_panic, str, 127);
1339         vmcmd_on_panic[127] = 0;
1340         on_panic_trigger.action = &vmcmd_action;
1341         return 1;
1342 }
1343 __setup("vmpanic=", vmcmd_on_panic_setup);
1344
1345 static int __init vmcmd_on_halt_setup(char *str)
1346 {
1347         if (!MACHINE_IS_VM)
1348                 return 1;
1349         strncpy_skip_quote(vmcmd_on_halt, str, 127);
1350         vmcmd_on_halt[127] = 0;
1351         on_halt_trigger.action = &vmcmd_action;
1352         return 1;
1353 }
1354 __setup("vmhalt=", vmcmd_on_halt_setup);
1355
1356 static int __init vmcmd_on_poff_setup(char *str)
1357 {
1358         if (!MACHINE_IS_VM)
1359                 return 1;
1360         strncpy_skip_quote(vmcmd_on_poff, str, 127);
1361         vmcmd_on_poff[127] = 0;
1362         on_poff_trigger.action = &vmcmd_action;
1363         return 1;
1364 }
1365 __setup("vmpoff=", vmcmd_on_poff_setup);
1366
1367 static int on_panic_notify(struct notifier_block *self,
1368                            unsigned long event, void *data)
1369 {
1370         do_panic();
1371         return NOTIFY_OK;
1372 }
1373
1374 static struct notifier_block on_panic_nb = {
1375         .notifier_call = on_panic_notify,
1376         .priority = 0,
1377 };
1378
1379 void __init setup_ipl(void)
1380 {
1381         ipl_info.type = get_ipl_type();
1382         switch (ipl_info.type) {
1383         case IPL_TYPE_CCW:
1384                 ipl_info.data.ccw.dev_id.devno = ipl_devno;
1385                 ipl_info.data.ccw.dev_id.ssid = 0;
1386                 break;
1387         case IPL_TYPE_FCP:
1388         case IPL_TYPE_FCP_DUMP:
1389                 ipl_info.data.fcp.dev_id.devno =
1390                         IPL_PARMBLOCK_START->ipl_info.fcp.devno;
1391                 ipl_info.data.fcp.dev_id.ssid = 0;
1392                 ipl_info.data.fcp.wwpn = IPL_PARMBLOCK_START->ipl_info.fcp.wwpn;
1393                 ipl_info.data.fcp.lun = IPL_PARMBLOCK_START->ipl_info.fcp.lun;
1394                 break;
1395         case IPL_TYPE_NSS:
1396                 strncpy(ipl_info.data.nss.name, kernel_nss_name,
1397                         sizeof(ipl_info.data.nss.name));
1398                 break;
1399         case IPL_TYPE_UNKNOWN:
1400         default:
1401                 /* We have no info to copy */
1402                 break;
1403         }
1404         atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
1405 }
1406
1407 void __init ipl_save_parameters(void)
1408 {
1409         struct cio_iplinfo iplinfo;
1410         unsigned int *ipl_ptr;
1411         void *src, *dst;
1412
1413         if (cio_get_iplinfo(&iplinfo))
1414                 return;
1415
1416         ipl_devno = iplinfo.devno;
1417         ipl_flags |= IPL_DEVNO_VALID;
1418         if (!iplinfo.is_qdio)
1419                 return;
1420         ipl_flags |= IPL_PARMBLOCK_VALID;
1421         ipl_ptr = (unsigned int *)__LC_IPL_PARMBLOCK_PTR;
1422         src = (void *)(unsigned long)*ipl_ptr;
1423         dst = (void *)IPL_PARMBLOCK_ORIGIN;
1424         memmove(dst, src, PAGE_SIZE);
1425         *ipl_ptr = IPL_PARMBLOCK_ORIGIN;
1426 }
1427
1428 static LIST_HEAD(rcall);
1429 static DEFINE_MUTEX(rcall_mutex);
1430
1431 void register_reset_call(struct reset_call *reset)
1432 {
1433         mutex_lock(&rcall_mutex);
1434         list_add(&reset->list, &rcall);
1435         mutex_unlock(&rcall_mutex);
1436 }
1437 EXPORT_SYMBOL_GPL(register_reset_call);
1438
1439 void unregister_reset_call(struct reset_call *reset)
1440 {
1441         mutex_lock(&rcall_mutex);
1442         list_del(&reset->list);
1443         mutex_unlock(&rcall_mutex);
1444 }
1445 EXPORT_SYMBOL_GPL(unregister_reset_call);
1446
1447 static void do_reset_calls(void)
1448 {
1449         struct reset_call *reset;
1450
1451         list_for_each_entry(reset, &rcall, list)
1452                 reset->fn();
1453 }
1454
1455 u32 dump_prefix_page;
1456
1457 void s390_reset_system(void)
1458 {
1459         struct _lowcore *lc;
1460
1461         lc = (struct _lowcore *)(unsigned long) store_prefix();
1462
1463         /* Stack for interrupt/machine check handler */
1464         lc->panic_stack = S390_lowcore.panic_stack;
1465
1466         /* Save prefix page address for dump case */
1467         dump_prefix_page = (u32)(unsigned long) lc;
1468
1469         /* Disable prefixing */
1470         set_prefix(0);
1471
1472         /* Disable lowcore protection */
1473         __ctl_clear_bit(0,28);
1474
1475         /* Set new machine check handler */
1476         S390_lowcore.mcck_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
1477         S390_lowcore.mcck_new_psw.addr =
1478                 PSW_ADDR_AMODE | (unsigned long) s390_base_mcck_handler;
1479
1480         /* Set new program check handler */
1481         S390_lowcore.program_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
1482         S390_lowcore.program_new_psw.addr =
1483                 PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
1484
1485         do_reset_calls();
1486 }
1487