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ia64/kvm: compilation fix. export account_system_vtime.
[pv_ops_mirror.git] / arch / s390 / kernel / ipl.c
blob532542447d661a34537e42ff69571616d8874865
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 static 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 disabled_wait((unsigned long) __builtin_return_address(0));
708 }
709
710 static void __init reipl_probe(void)
711 {
712 void *buffer;
713
714 buffer = (void *) get_zeroed_page(GFP_KERNEL);
715 if (!buffer)
716 return;
717 if (diag308(DIAG308_STORE, buffer) == DIAG308_RC_OK)
718 diag308_set_works = 1;
719 free_page((unsigned long)buffer);
720 }
721
722 static int __init reipl_nss_init(void)
723 {
724 int rc;
725
726 if (!MACHINE_IS_VM)
727 return 0;
728 rc = sysfs_create_group(&reipl_kset->kobj, &reipl_nss_attr_group);
729 if (rc)
730 return rc;
731 strncpy(reipl_nss_name, kernel_nss_name, NSS_NAME_SIZE + 1);
732 reipl_capabilities |= IPL_TYPE_NSS;
733 return 0;
734 }
735
736 static int __init reipl_ccw_init(void)
737 {
738 int rc;
739
740 reipl_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
741 if (!reipl_block_ccw)
742 return -ENOMEM;
743 rc = sysfs_create_group(&reipl_kset->kobj, &reipl_ccw_attr_group);
744 if (rc) {
745 free_page((unsigned long)reipl_block_ccw);
746 return rc;
747 }
748 reipl_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
749 reipl_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
750 reipl_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
751 reipl_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
752 reipl_block_ccw->hdr.flags = DIAG308_FLAGS_LP_VALID;
753 /* check if read scp info worked and set loadparm */
754 if (sclp_ipl_info.is_valid)
755 memcpy(reipl_block_ccw->ipl_info.ccw.load_param,
756 &sclp_ipl_info.loadparm, LOADPARM_LEN);
757 else
758 /* read scp info failed: set empty loadparm (EBCDIC blanks) */
759 memset(reipl_block_ccw->ipl_info.ccw.load_param, 0x40,
760 LOADPARM_LEN);
761 if (!MACHINE_IS_VM && !diag308_set_works)
762 sys_reipl_ccw_loadparm_attr.attr.mode = S_IRUGO;
763 if (ipl_info.type == IPL_TYPE_CCW)
764 reipl_block_ccw->ipl_info.ccw.devno = ipl_devno;
765 reipl_capabilities |= IPL_TYPE_CCW;
766 return 0;
767 }
768
769 static int __init reipl_fcp_init(void)
770 {
771 int rc;
772
773 if ((!diag308_set_works) && (ipl_info.type != IPL_TYPE_FCP))
774 return 0;
775 if ((!diag308_set_works) && (ipl_info.type == IPL_TYPE_FCP))
776 make_attrs_ro(reipl_fcp_attrs);
777
778 reipl_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
779 if (!reipl_block_fcp)
780 return -ENOMEM;
781 rc = sysfs_create_group(&reipl_kset->kobj, &reipl_fcp_attr_group);
782 if (rc) {
783 free_page((unsigned long)reipl_block_fcp);
784 return rc;
785 }
786 if (ipl_info.type == IPL_TYPE_FCP) {
787 memcpy(reipl_block_fcp, IPL_PARMBLOCK_START, PAGE_SIZE);
788 } else {
789 reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
790 reipl_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
791 reipl_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
792 reipl_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
793 reipl_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_IPL;
794 }
795 reipl_capabilities |= IPL_TYPE_FCP;
796 return 0;
797 }
798
799 static int __init reipl_init(void)
800 {
801 int rc;
802
803 reipl_kset = kset_create_and_add("reipl", NULL, firmware_kobj);
804 if (!reipl_kset)
805 return -ENOMEM;
806 rc = sysfs_create_file(&reipl_kset->kobj, &reipl_type_attr.attr);
807 if (rc) {
808 kset_unregister(reipl_kset);
809 return rc;
810 }
811 rc = reipl_ccw_init();
812 if (rc)
813 return rc;
814 rc = reipl_fcp_init();
815 if (rc)
816 return rc;
817 rc = reipl_nss_init();
818 if (rc)
819 return rc;
820 rc = reipl_set_type(ipl_info.type);
821 if (rc)
822 return rc;
823 return 0;
824 }
825
826 static struct shutdown_action __refdata reipl_action = {
827 .name = SHUTDOWN_ACTION_REIPL_STR,
828 .fn = reipl_run,
829 .init = reipl_init,
830 };
831
832 /*
833 * dump shutdown action: Dump Linux on shutdown.
834 */
835
836 /* FCP dump device attributes */
837
838 DEFINE_IPL_ATTR_RW(dump_fcp, wwpn, "0x%016llx\n", "%016llx\n",
839 dump_block_fcp->ipl_info.fcp.wwpn);
840 DEFINE_IPL_ATTR_RW(dump_fcp, lun, "0x%016llx\n", "%016llx\n",
841 dump_block_fcp->ipl_info.fcp.lun);
842 DEFINE_IPL_ATTR_RW(dump_fcp, bootprog, "%lld\n", "%lld\n",
843 dump_block_fcp->ipl_info.fcp.bootprog);
844 DEFINE_IPL_ATTR_RW(dump_fcp, br_lba, "%lld\n", "%lld\n",
845 dump_block_fcp->ipl_info.fcp.br_lba);
846 DEFINE_IPL_ATTR_RW(dump_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
847 dump_block_fcp->ipl_info.fcp.devno);
848
849 static struct attribute *dump_fcp_attrs[] = {
850 &sys_dump_fcp_device_attr.attr,
851 &sys_dump_fcp_wwpn_attr.attr,
852 &sys_dump_fcp_lun_attr.attr,
853 &sys_dump_fcp_bootprog_attr.attr,
854 &sys_dump_fcp_br_lba_attr.attr,
855 NULL,
856 };
857
858 static struct attribute_group dump_fcp_attr_group = {
859 .name = IPL_FCP_STR,
860 .attrs = dump_fcp_attrs,
861 };
862
863 /* CCW dump device attributes */
864
865 DEFINE_IPL_ATTR_RW(dump_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
866 dump_block_ccw->ipl_info.ccw.devno);
867
868 static struct attribute *dump_ccw_attrs[] = {
869 &sys_dump_ccw_device_attr.attr,
870 NULL,
871 };
872
873 static struct attribute_group dump_ccw_attr_group = {
874 .name = IPL_CCW_STR,
875 .attrs = dump_ccw_attrs,
876 };
877
878 /* dump type */
879
880 static int dump_set_type(enum dump_type type)
881 {
882 if (!(dump_capabilities & type))
883 return -EINVAL;
884 switch (type) {
885 case DUMP_TYPE_CCW:
886 if (diag308_set_works)
887 dump_method = DUMP_METHOD_CCW_DIAG;
888 else if (MACHINE_IS_VM)
889 dump_method = DUMP_METHOD_CCW_VM;
890 else
891 dump_method = DUMP_METHOD_CCW_CIO;
892 break;
893 case DUMP_TYPE_FCP:
894 dump_method = DUMP_METHOD_FCP_DIAG;
895 break;
896 default:
897 dump_method = DUMP_METHOD_NONE;
898 }
899 dump_type = type;
900 return 0;
901 }
902
903 static ssize_t dump_type_show(struct kobject *kobj,
904 struct kobj_attribute *attr, char *page)
905 {
906 return sprintf(page, "%s\n", dump_type_str(dump_type));
907 }
908
909 static ssize_t dump_type_store(struct kobject *kobj,
910 struct kobj_attribute *attr,
911 const char *buf, size_t len)
912 {
913 int rc = -EINVAL;
914
915 if (strncmp(buf, DUMP_NONE_STR, strlen(DUMP_NONE_STR)) == 0)
916 rc = dump_set_type(DUMP_TYPE_NONE);
917 else if (strncmp(buf, DUMP_CCW_STR, strlen(DUMP_CCW_STR)) == 0)
918 rc = dump_set_type(DUMP_TYPE_CCW);
919 else if (strncmp(buf, DUMP_FCP_STR, strlen(DUMP_FCP_STR)) == 0)
920 rc = dump_set_type(DUMP_TYPE_FCP);
921 return (rc != 0) ? rc : len;
922 }
923
924 static struct kobj_attribute dump_type_attr =
925 __ATTR(dump_type, 0644, dump_type_show, dump_type_store);
926
927 static struct kset *dump_kset;
928
929 static void dump_run(struct shutdown_trigger *trigger)
930 {
931 struct ccw_dev_id devid;
932 static char buf[100];
933
934 switch (dump_method) {
935 case DUMP_METHOD_CCW_CIO:
936 smp_send_stop();
937 devid.devno = dump_block_ccw->ipl_info.ccw.devno;
938 devid.ssid = 0;
939 reipl_ccw_dev(&devid);
940 break;
941 case DUMP_METHOD_CCW_VM:
942 smp_send_stop();
943 sprintf(buf, "STORE STATUS");
944 __cpcmd(buf, NULL, 0, NULL);
945 sprintf(buf, "IPL %X", dump_block_ccw->ipl_info.ccw.devno);
946 __cpcmd(buf, NULL, 0, NULL);
947 break;
948 case DUMP_METHOD_CCW_DIAG:
949 diag308(DIAG308_SET, dump_block_ccw);
950 diag308(DIAG308_DUMP, NULL);
951 break;
952 case DUMP_METHOD_FCP_DIAG:
953 diag308(DIAG308_SET, dump_block_fcp);
954 diag308(DIAG308_DUMP, NULL);
955 break;
956 case DUMP_METHOD_NONE:
957 default:
958 return;
959 }
960 printk(KERN_EMERG "Dump failed!\n");
961 }
962
963 static int __init dump_ccw_init(void)
964 {
965 int rc;
966
967 dump_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
968 if (!dump_block_ccw)
969 return -ENOMEM;
970 rc = sysfs_create_group(&dump_kset->kobj, &dump_ccw_attr_group);
971 if (rc) {
972 free_page((unsigned long)dump_block_ccw);
973 return rc;
974 }
975 dump_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
976 dump_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
977 dump_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
978 dump_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
979 dump_capabilities |= DUMP_TYPE_CCW;
980 return 0;
981 }
982
983 static int __init dump_fcp_init(void)
984 {
985 int rc;
986
987 if (!sclp_ipl_info.has_dump)
988 return 0; /* LDIPL DUMP is not installed */
989 if (!diag308_set_works)
990 return 0;
991 dump_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
992 if (!dump_block_fcp)
993 return -ENOMEM;
994 rc = sysfs_create_group(&dump_kset->kobj, &dump_fcp_attr_group);
995 if (rc) {
996 free_page((unsigned long)dump_block_fcp);
997 return rc;
998 }
999 dump_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
1000 dump_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
1001 dump_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
1002 dump_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
1003 dump_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_DUMP;
1004 dump_capabilities |= DUMP_TYPE_FCP;
1005 return 0;
1006 }
1007
1008 static int __init dump_init(void)
1009 {
1010 int rc;
1011
1012 dump_kset = kset_create_and_add("dump", NULL, firmware_kobj);
1013 if (!dump_kset)
1014 return -ENOMEM;
1015 rc = sysfs_create_file(&dump_kset->kobj, &dump_type_attr.attr);
1016 if (rc) {
1017 kset_unregister(dump_kset);
1018 return rc;
1019 }
1020 rc = dump_ccw_init();
1021 if (rc)
1022 return rc;
1023 rc = dump_fcp_init();
1024 if (rc)
1025 return rc;
1026 dump_set_type(DUMP_TYPE_NONE);
1027 return 0;
1028 }
1029
1030 static struct shutdown_action __refdata dump_action = {
1031 .name = SHUTDOWN_ACTION_DUMP_STR,
1032 .fn = dump_run,
1033 .init = dump_init,
1034 };
1035
1036 /*
1037 * vmcmd shutdown action: Trigger vm command on shutdown.
1038 */
1039
1040 static char vmcmd_on_reboot[128];
1041 static char vmcmd_on_panic[128];
1042 static char vmcmd_on_halt[128];
1043 static char vmcmd_on_poff[128];
1044
1045 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_reboot, "%s\n", "%s\n", vmcmd_on_reboot);
1046 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_panic, "%s\n", "%s\n", vmcmd_on_panic);
1047 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_halt, "%s\n", "%s\n", vmcmd_on_halt);
1048 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_poff, "%s\n", "%s\n", vmcmd_on_poff);
1049
1050 static struct attribute *vmcmd_attrs[] = {
1051 &sys_vmcmd_on_reboot_attr.attr,
1052 &sys_vmcmd_on_panic_attr.attr,
1053 &sys_vmcmd_on_halt_attr.attr,
1054 &sys_vmcmd_on_poff_attr.attr,
1055 NULL,
1056 };
1057
1058 static struct attribute_group vmcmd_attr_group = {
1059 .attrs = vmcmd_attrs,
1060 };
1061
1062 static struct kset *vmcmd_kset;
1063
1064 static void vmcmd_run(struct shutdown_trigger *trigger)
1065 {
1066 char *cmd, *next_cmd;
1067
1068 if (strcmp(trigger->name, ON_REIPL_STR) == 0)
1069 cmd = vmcmd_on_reboot;
1070 else if (strcmp(trigger->name, ON_PANIC_STR) == 0)
1071 cmd = vmcmd_on_panic;
1072 else if (strcmp(trigger->name, ON_HALT_STR) == 0)
1073 cmd = vmcmd_on_halt;
1074 else if (strcmp(trigger->name, ON_POFF_STR) == 0)
1075 cmd = vmcmd_on_poff;
1076 else
1077 return;
1078
1079 if (strlen(cmd) == 0)
1080 return;
1081 do {
1082 next_cmd = strchr(cmd, '\n');
1083 if (next_cmd) {
1084 next_cmd[0] = 0;
1085 next_cmd += 1;
1086 }
1087 __cpcmd(cmd, NULL, 0, NULL);
1088 cmd = next_cmd;
1089 } while (cmd != NULL);
1090 }
1091
1092 static int vmcmd_init(void)
1093 {
1094 if (!MACHINE_IS_VM)
1095 return -ENOTSUPP;
1096 vmcmd_kset = kset_create_and_add("vmcmd", NULL, firmware_kobj);
1097 if (!vmcmd_kset)
1098 return -ENOMEM;
1099 return sysfs_create_group(&vmcmd_kset->kobj, &vmcmd_attr_group);
1100 }
1101
1102 static struct shutdown_action vmcmd_action = {SHUTDOWN_ACTION_VMCMD_STR,
1103 vmcmd_run, vmcmd_init};
1104
1105 /*
1106 * stop shutdown action: Stop Linux on shutdown.
1107 */
1108
1109 static void stop_run(struct shutdown_trigger *trigger)
1110 {
1111 if (strcmp(trigger->name, ON_PANIC_STR) == 0)
1112 disabled_wait((unsigned long) __builtin_return_address(0));
1113 else {
1114 signal_processor(smp_processor_id(), sigp_stop);
1115 for (;;);
1116 }
1117 }
1118
1119 static struct shutdown_action stop_action = {SHUTDOWN_ACTION_STOP_STR,
1120 stop_run, NULL};
1121
1122 /* action list */
1123
1124 static struct shutdown_action *shutdown_actions_list[] = {
1125 &ipl_action, &reipl_action, &dump_action, &vmcmd_action, &stop_action};
1126 #define SHUTDOWN_ACTIONS_COUNT (sizeof(shutdown_actions_list) / sizeof(void *))
1127
1128 /*
1129 * Trigger section
1130 */
1131
1132 static struct kset *shutdown_actions_kset;
1133
1134 static int set_trigger(const char *buf, struct shutdown_trigger *trigger,
1135 size_t len)
1136 {
1137 int i;
1138 for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
1139 if (!shutdown_actions_list[i])
1140 continue;
1141 if (strncmp(buf, shutdown_actions_list[i]->name,
1142 strlen(shutdown_actions_list[i]->name)) == 0) {
1143 trigger->action = shutdown_actions_list[i];
1144 return len;
1145 }
1146 }
1147 return -EINVAL;
1148 }
1149
1150 /* on reipl */
1151
1152 static struct shutdown_trigger on_reboot_trigger = {ON_REIPL_STR,
1153 &reipl_action};
1154
1155 static ssize_t on_reboot_show(struct kobject *kobj,
1156 struct kobj_attribute *attr, char *page)
1157 {
1158 return sprintf(page, "%s\n", on_reboot_trigger.action->name);
1159 }
1160
1161 static ssize_t on_reboot_store(struct kobject *kobj,
1162 struct kobj_attribute *attr,
1163 const char *buf, size_t len)
1164 {
1165 return set_trigger(buf, &on_reboot_trigger, len);
1166 }
1167
1168 static struct kobj_attribute on_reboot_attr =
1169 __ATTR(on_reboot, 0644, on_reboot_show, on_reboot_store);
1170
1171 static void do_machine_restart(char *__unused)
1172 {
1173 smp_send_stop();
1174 on_reboot_trigger.action->fn(&on_reboot_trigger);
1175 reipl_run(NULL);
1176 }
1177 void (*_machine_restart)(char *command) = do_machine_restart;
1178
1179 /* on panic */
1180
1181 static struct shutdown_trigger on_panic_trigger = {ON_PANIC_STR, &stop_action};
1182
1183 static ssize_t on_panic_show(struct kobject *kobj,
1184 struct kobj_attribute *attr, char *page)
1185 {
1186 return sprintf(page, "%s\n", on_panic_trigger.action->name);
1187 }
1188
1189 static ssize_t on_panic_store(struct kobject *kobj,
1190 struct kobj_attribute *attr,
1191 const char *buf, size_t len)
1192 {
1193 return set_trigger(buf, &on_panic_trigger, len);
1194 }
1195
1196 static struct kobj_attribute on_panic_attr =
1197 __ATTR(on_panic, 0644, on_panic_show, on_panic_store);
1198
1199 static void do_panic(void)
1200 {
1201 on_panic_trigger.action->fn(&on_panic_trigger);
1202 stop_run(&on_panic_trigger);
1203 }
1204
1205 /* on halt */
1206
1207 static struct shutdown_trigger on_halt_trigger = {ON_HALT_STR, &stop_action};
1208
1209 static ssize_t on_halt_show(struct kobject *kobj,
1210 struct kobj_attribute *attr, char *page)
1211 {
1212 return sprintf(page, "%s\n", on_halt_trigger.action->name);
1213 }
1214
1215 static ssize_t on_halt_store(struct kobject *kobj,
1216 struct kobj_attribute *attr,
1217 const char *buf, size_t len)
1218 {
1219 return set_trigger(buf, &on_halt_trigger, len);
1220 }
1221
1222 static struct kobj_attribute on_halt_attr =
1223 __ATTR(on_halt, 0644, on_halt_show, on_halt_store);
1224
1225
1226 static void do_machine_halt(void)
1227 {
1228 smp_send_stop();
1229 on_halt_trigger.action->fn(&on_halt_trigger);
1230 stop_run(&on_halt_trigger);
1231 }
1232 void (*_machine_halt)(void) = do_machine_halt;
1233
1234 /* on power off */
1235
1236 static struct shutdown_trigger on_poff_trigger = {ON_POFF_STR, &stop_action};
1237
1238 static ssize_t on_poff_show(struct kobject *kobj,
1239 struct kobj_attribute *attr, char *page)
1240 {
1241 return sprintf(page, "%s\n", on_poff_trigger.action->name);
1242 }
1243
1244 static ssize_t on_poff_store(struct kobject *kobj,
1245 struct kobj_attribute *attr,
1246 const char *buf, size_t len)
1247 {
1248 return set_trigger(buf, &on_poff_trigger, len);
1249 }
1250
1251 static struct kobj_attribute on_poff_attr =
1252 __ATTR(on_poff, 0644, on_poff_show, on_poff_store);
1253
1254
1255 static void do_machine_power_off(void)
1256 {
1257 smp_send_stop();
1258 on_poff_trigger.action->fn(&on_poff_trigger);
1259 stop_run(&on_poff_trigger);
1260 }
1261 void (*_machine_power_off)(void) = do_machine_power_off;
1262
1263 static void __init shutdown_triggers_init(void)
1264 {
1265 shutdown_actions_kset = kset_create_and_add("shutdown_actions", NULL,
1266 firmware_kobj);
1267 if (!shutdown_actions_kset)
1268 goto fail;
1269 if (sysfs_create_file(&shutdown_actions_kset->kobj,
1270 &on_reboot_attr.attr))
1271 goto fail;
1272 if (sysfs_create_file(&shutdown_actions_kset->kobj,
1273 &on_panic_attr.attr))
1274 goto fail;
1275 if (sysfs_create_file(&shutdown_actions_kset->kobj,
1276 &on_halt_attr.attr))
1277 goto fail;
1278 if (sysfs_create_file(&shutdown_actions_kset->kobj,
1279 &on_poff_attr.attr))
1280 goto fail;
1281
1282 return;
1283 fail:
1284 panic("shutdown_triggers_init failed\n");
1285 }
1286
1287 static void __init shutdown_actions_init(void)
1288 {
1289 int i;
1290
1291 for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
1292 if (!shutdown_actions_list[i]->init)
1293 continue;
1294 if (shutdown_actions_list[i]->init())
1295 shutdown_actions_list[i] = NULL;
1296 }
1297 }
1298
1299 static int __init s390_ipl_init(void)
1300 {
1301 reipl_probe();
1302 sclp_get_ipl_info(&sclp_ipl_info);
1303 shutdown_actions_init();
1304 shutdown_triggers_init();
1305 return 0;
1306 }
1307
1308 __initcall(s390_ipl_init);
1309
1310 static void __init strncpy_skip_quote(char *dst, char *src, int n)
1311 {
1312 int sx, dx;
1313
1314 dx = 0;
1315 for (sx = 0; src[sx] != 0; sx++) {
1316 if (src[sx] == '"')
1317 continue;
1318 dst[dx++] = src[sx];
1319 if (dx >= n)
1320 break;
1321 }
1322 }
1323
1324 static int __init vmcmd_on_reboot_setup(char *str)
1325 {
1326 if (!MACHINE_IS_VM)
1327 return 1;
1328 strncpy_skip_quote(vmcmd_on_reboot, str, 127);
1329 vmcmd_on_reboot[127] = 0;
1330 on_reboot_trigger.action = &vmcmd_action;
1331 return 1;
1332 }
1333 __setup("vmreboot=", vmcmd_on_reboot_setup);
1334
1335 static int __init vmcmd_on_panic_setup(char *str)
1336 {
1337 if (!MACHINE_IS_VM)
1338 return 1;
1339 strncpy_skip_quote(vmcmd_on_panic, str, 127);
1340 vmcmd_on_panic[127] = 0;
1341 on_panic_trigger.action = &vmcmd_action;
1342 return 1;
1343 }
1344 __setup("vmpanic=", vmcmd_on_panic_setup);
1345
1346 static int __init vmcmd_on_halt_setup(char *str)
1347 {
1348 if (!MACHINE_IS_VM)
1349 return 1;
1350 strncpy_skip_quote(vmcmd_on_halt, str, 127);
1351 vmcmd_on_halt[127] = 0;
1352 on_halt_trigger.action = &vmcmd_action;
1353 return 1;
1354 }
1355 __setup("vmhalt=", vmcmd_on_halt_setup);
1356
1357 static int __init vmcmd_on_poff_setup(char *str)
1358 {
1359 if (!MACHINE_IS_VM)
1360 return 1;
1361 strncpy_skip_quote(vmcmd_on_poff, str, 127);
1362 vmcmd_on_poff[127] = 0;
1363 on_poff_trigger.action = &vmcmd_action;
1364 return 1;
1365 }
1366 __setup("vmpoff=", vmcmd_on_poff_setup);
1367
1368 static int on_panic_notify(struct notifier_block *self,
1369 unsigned long event, void *data)
1370 {
1371 do_panic();
1372 return NOTIFY_OK;
1373 }
1374
1375 static struct notifier_block on_panic_nb = {
1376 .notifier_call = on_panic_notify,
1377 .priority = 0,
1378 };
1379
1380 void __init setup_ipl(void)
1381 {
1382 ipl_info.type = get_ipl_type();
1383 switch (ipl_info.type) {
1384 case IPL_TYPE_CCW:
1385 ipl_info.data.ccw.dev_id.devno = ipl_devno;
1386 ipl_info.data.ccw.dev_id.ssid = 0;
1387 break;
1388 case IPL_TYPE_FCP:
1389 case IPL_TYPE_FCP_DUMP:
1390 ipl_info.data.fcp.dev_id.devno =
1391 IPL_PARMBLOCK_START->ipl_info.fcp.devno;
1392 ipl_info.data.fcp.dev_id.ssid = 0;
1393 ipl_info.data.fcp.wwpn = IPL_PARMBLOCK_START->ipl_info.fcp.wwpn;
1394 ipl_info.data.fcp.lun = IPL_PARMBLOCK_START->ipl_info.fcp.lun;
1395 break;
1396 case IPL_TYPE_NSS:
1397 strncpy(ipl_info.data.nss.name, kernel_nss_name,
1398 sizeof(ipl_info.data.nss.name));
1399 break;
1400 case IPL_TYPE_UNKNOWN:
1401 default:
1402 /* We have no info to copy */
1403 break;
1404 }
1405 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
1406 }
1407
1408 void __init ipl_save_parameters(void)
1409 {
1410 struct cio_iplinfo iplinfo;
1411 unsigned int *ipl_ptr;
1412 void *src, *dst;
1413
1414 if (cio_get_iplinfo(&iplinfo))
1415 return;
1416
1417 ipl_devno = iplinfo.devno;
1418 ipl_flags |= IPL_DEVNO_VALID;
1419 if (!iplinfo.is_qdio)
1420 return;
1421 ipl_flags |= IPL_PARMBLOCK_VALID;
1422 ipl_ptr = (unsigned int *)__LC_IPL_PARMBLOCK_PTR;
1423 src = (void *)(unsigned long)*ipl_ptr;
1424 dst = (void *)IPL_PARMBLOCK_ORIGIN;
1425 memmove(dst, src, PAGE_SIZE);
1426 *ipl_ptr = IPL_PARMBLOCK_ORIGIN;
1427 }
1428
1429 static LIST_HEAD(rcall);
1430 static DEFINE_MUTEX(rcall_mutex);
1431
1432 void register_reset_call(struct reset_call *reset)
1433 {
1434 mutex_lock(&rcall_mutex);
1435 list_add(&reset->list, &rcall);
1436 mutex_unlock(&rcall_mutex);
1437 }
1438 EXPORT_SYMBOL_GPL(register_reset_call);
1439
1440 void unregister_reset_call(struct reset_call *reset)
1441 {
1442 mutex_lock(&rcall_mutex);
1443 list_del(&reset->list);
1444 mutex_unlock(&rcall_mutex);
1445 }
1446 EXPORT_SYMBOL_GPL(unregister_reset_call);
1447
1448 static void do_reset_calls(void)
1449 {
1450 struct reset_call *reset;
1451
1452 list_for_each_entry(reset, &rcall, list)
1453 reset->fn();
1454 }
1455
1456 u32 dump_prefix_page;
1457
1458 void s390_reset_system(void)
1459 {
1460 struct _lowcore *lc;
1461
1462 lc = (struct _lowcore *)(unsigned long) store_prefix();
1463
1464 /* Stack for interrupt/machine check handler */
1465 lc->panic_stack = S390_lowcore.panic_stack;
1466
1467 /* Save prefix page address for dump case */
1468 dump_prefix_page = (u32)(unsigned long) lc;
1469
1470 /* Disable prefixing */
1471 set_prefix(0);
1472
1473 /* Disable lowcore protection */
1474 __ctl_clear_bit(0,28);
1475
1476 /* Set new machine check handler */
1477 S390_lowcore.mcck_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
1478 S390_lowcore.mcck_new_psw.addr =
1479 PSW_ADDR_AMODE | (unsigned long) s390_base_mcck_handler;
1480
1481 /* Set new program check handler */
1482 S390_lowcore.program_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
1483 S390_lowcore.program_new_psw.addr =
1484 PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
1485
1486 do_reset_calls();
1487 }
1488
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