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[S390] Convert memory detection into C code.
[linux-2.6/verdex.git] / arch / s390 / kernel / ipl.c
blob052259530651cddcd12eba6f415b4349947962f6
1 /*
2 * arch/s390/kernel/ipl.c
3 * ipl/reipl/dump support for Linux on s390.
4 *
5 * Copyright (C) IBM Corp. 2005,2006
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/smp.h>
18 #include <asm/setup.h>
19 #include <asm/cpcmd.h>
20 #include <asm/cio.h>
21 #include <asm/ebcdic.h>
22 #include <asm/reset.h>
23 #include <asm/sclp.h>
24
25 #define IPL_PARM_BLOCK_VERSION 0
26
27 #define SCCB_VALID (s390_readinfo_sccb.header.response_code == 0x10)
28 #define SCCB_LOADPARM (&s390_readinfo_sccb.loadparm)
29 #define SCCB_FLAG (s390_readinfo_sccb.flags)
30
31 enum ipl_type {
32 IPL_TYPE_NONE = 1,
33 IPL_TYPE_UNKNOWN = 2,
34 IPL_TYPE_CCW = 4,
35 IPL_TYPE_FCP = 8,
36 IPL_TYPE_NSS = 16,
37 };
38
39 #define IPL_NONE_STR "none"
40 #define IPL_UNKNOWN_STR "unknown"
41 #define IPL_CCW_STR "ccw"
42 #define IPL_FCP_STR "fcp"
43 #define IPL_NSS_STR "nss"
44
45 static char *ipl_type_str(enum ipl_type type)
46 {
47 switch (type) {
48 case IPL_TYPE_NONE:
49 return IPL_NONE_STR;
50 case IPL_TYPE_CCW:
51 return IPL_CCW_STR;
52 case IPL_TYPE_FCP:
53 return IPL_FCP_STR;
54 case IPL_TYPE_NSS:
55 return IPL_NSS_STR;
56 case IPL_TYPE_UNKNOWN:
57 default:
58 return IPL_UNKNOWN_STR;
59 }
60 }
61
62 enum ipl_method {
63 IPL_METHOD_NONE,
64 IPL_METHOD_CCW_CIO,
65 IPL_METHOD_CCW_DIAG,
66 IPL_METHOD_CCW_VM,
67 IPL_METHOD_FCP_RO_DIAG,
68 IPL_METHOD_FCP_RW_DIAG,
69 IPL_METHOD_FCP_RO_VM,
70 IPL_METHOD_NSS,
71 };
72
73 enum shutdown_action {
74 SHUTDOWN_REIPL,
75 SHUTDOWN_DUMP,
76 SHUTDOWN_STOP,
77 };
78
79 #define SHUTDOWN_REIPL_STR "reipl"
80 #define SHUTDOWN_DUMP_STR "dump"
81 #define SHUTDOWN_STOP_STR "stop"
82
83 static char *shutdown_action_str(enum shutdown_action action)
84 {
85 switch (action) {
86 case SHUTDOWN_REIPL:
87 return SHUTDOWN_REIPL_STR;
88 case SHUTDOWN_DUMP:
89 return SHUTDOWN_DUMP_STR;
90 case SHUTDOWN_STOP:
91 return SHUTDOWN_STOP_STR;
92 default:
93 BUG();
94 }
95 }
96
97 enum diag308_subcode {
98 DIAG308_IPL = 3,
99 DIAG308_DUMP = 4,
100 DIAG308_SET = 5,
101 DIAG308_STORE = 6,
102 };
103
104 enum diag308_ipl_type {
105 DIAG308_IPL_TYPE_FCP = 0,
106 DIAG308_IPL_TYPE_CCW = 2,
107 };
108
109 enum diag308_opt {
110 DIAG308_IPL_OPT_IPL = 0x10,
111 DIAG308_IPL_OPT_DUMP = 0x20,
112 };
113
114 enum diag308_rc {
115 DIAG308_RC_OK = 1,
116 };
117
118 static int diag308_set_works = 0;
119
120 static int reipl_capabilities = IPL_TYPE_UNKNOWN;
121
122 static enum ipl_type reipl_type = IPL_TYPE_UNKNOWN;
123 static enum ipl_method reipl_method = IPL_METHOD_NONE;
124 static struct ipl_parameter_block *reipl_block_fcp;
125 static struct ipl_parameter_block *reipl_block_ccw;
126
127 static char reipl_nss_name[NSS_NAME_SIZE + 1];
128
129 static int dump_capabilities = IPL_TYPE_NONE;
130 static enum ipl_type dump_type = IPL_TYPE_NONE;
131 static enum ipl_method dump_method = IPL_METHOD_NONE;
132 static struct ipl_parameter_block *dump_block_fcp;
133 static struct ipl_parameter_block *dump_block_ccw;
134
135 static enum shutdown_action on_panic_action = SHUTDOWN_STOP;
136
137 static int diag308(unsigned long subcode, void *addr)
138 {
139 register unsigned long _addr asm("0") = (unsigned long) addr;
140 register unsigned long _rc asm("1") = 0;
141
142 asm volatile(
143 " diag %0,%2,0x308\n"
144 "0:\n"
145 EX_TABLE(0b,0b)
146 : "+d" (_addr), "+d" (_rc)
147 : "d" (subcode) : "cc", "memory");
148 return _rc;
149 }
150
151 /* SYSFS */
152
153 #define DEFINE_IPL_ATTR_RO(_prefix, _name, _format, _value) \
154 static ssize_t sys_##_prefix##_##_name##_show(struct subsystem *subsys, \
155 char *page) \
156 { \
157 return sprintf(page, _format, _value); \
158 } \
159 static struct subsys_attribute sys_##_prefix##_##_name##_attr = \
160 __ATTR(_name, S_IRUGO, sys_##_prefix##_##_name##_show, NULL);
161
162 #define DEFINE_IPL_ATTR_RW(_prefix, _name, _fmt_out, _fmt_in, _value) \
163 static ssize_t sys_##_prefix##_##_name##_show(struct subsystem *subsys, \
164 char *page) \
165 { \
166 return sprintf(page, _fmt_out, \
167 (unsigned long long) _value); \
168 } \
169 static ssize_t sys_##_prefix##_##_name##_store(struct subsystem *subsys,\
170 const char *buf, size_t len) \
171 { \
172 unsigned long long value; \
173 if (sscanf(buf, _fmt_in, &value) != 1) \
174 return -EINVAL; \
175 _value = value; \
176 return len; \
177 } \
178 static struct subsys_attribute sys_##_prefix##_##_name##_attr = \
179 __ATTR(_name,(S_IRUGO | S_IWUSR), \
180 sys_##_prefix##_##_name##_show, \
181 sys_##_prefix##_##_name##_store);
182
183 #define DEFINE_IPL_ATTR_STR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)\
184 static ssize_t sys_##_prefix##_##_name##_show(struct subsystem *subsys, \
185 char *page) \
186 { \
187 return sprintf(page, _fmt_out, _value); \
188 } \
189 static ssize_t sys_##_prefix##_##_name##_store(struct subsystem *subsys,\
190 const char *buf, size_t len) \
191 { \
192 if (sscanf(buf, _fmt_in, _value) != 1) \
193 return -EINVAL; \
194 return len; \
195 } \
196 static struct subsys_attribute sys_##_prefix##_##_name##_attr = \
197 __ATTR(_name,(S_IRUGO | S_IWUSR), \
198 sys_##_prefix##_##_name##_show, \
199 sys_##_prefix##_##_name##_store);
200
201 static void make_attrs_ro(struct attribute **attrs)
202 {
203 while (*attrs) {
204 (*attrs)->mode = S_IRUGO;
205 attrs++;
206 }
207 }
208
209 /*
210 * ipl section
211 */
212
213 static enum ipl_type ipl_get_type(void)
214 {
215 struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
216
217 if (ipl_flags & IPL_NSS_VALID)
218 return IPL_TYPE_NSS;
219 if (!(ipl_flags & IPL_DEVNO_VALID))
220 return IPL_TYPE_UNKNOWN;
221 if (!(ipl_flags & IPL_PARMBLOCK_VALID))
222 return IPL_TYPE_CCW;
223 if (ipl->hdr.version > IPL_MAX_SUPPORTED_VERSION)
224 return IPL_TYPE_UNKNOWN;
225 if (ipl->hdr.pbt != DIAG308_IPL_TYPE_FCP)
226 return IPL_TYPE_UNKNOWN;
227 return IPL_TYPE_FCP;
228 }
229
230 static ssize_t ipl_type_show(struct subsystem *subsys, char *page)
231 {
232 return sprintf(page, "%s\n", ipl_type_str(ipl_get_type()));
233 }
234
235 static struct subsys_attribute sys_ipl_type_attr = __ATTR_RO(ipl_type);
236
237 static ssize_t sys_ipl_device_show(struct subsystem *subsys, char *page)
238 {
239 struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
240
241 switch (ipl_get_type()) {
242 case IPL_TYPE_CCW:
243 return sprintf(page, "0.0.%04x\n", ipl_devno);
244 case IPL_TYPE_FCP:
245 return sprintf(page, "0.0.%04x\n", ipl->ipl_info.fcp.devno);
246 default:
247 return 0;
248 }
249 }
250
251 static struct subsys_attribute sys_ipl_device_attr =
252 __ATTR(device, S_IRUGO, sys_ipl_device_show, NULL);
253
254 static ssize_t ipl_parameter_read(struct kobject *kobj, char *buf, loff_t off,
255 size_t count)
256 {
257 unsigned int size = IPL_PARMBLOCK_SIZE;
258
259 if (off > size)
260 return 0;
261 if (off + count > size)
262 count = size - off;
263 memcpy(buf, (void *)IPL_PARMBLOCK_START + off, count);
264 return count;
265 }
266
267 static struct bin_attribute ipl_parameter_attr = {
268 .attr = {
269 .name = "binary_parameter",
270 .mode = S_IRUGO,
271 .owner = THIS_MODULE,
272 },
273 .size = PAGE_SIZE,
274 .read = &ipl_parameter_read,
275 };
276
277 static ssize_t ipl_scp_data_read(struct kobject *kobj, char *buf, loff_t off,
278 size_t count)
279 {
280 unsigned int size = IPL_PARMBLOCK_START->ipl_info.fcp.scp_data_len;
281 void *scp_data = &IPL_PARMBLOCK_START->ipl_info.fcp.scp_data;
282
283 if (off > size)
284 return 0;
285 if (off + count > size)
286 count = size - off;
287 memcpy(buf, scp_data + off, count);
288 return count;
289 }
290
291 static struct bin_attribute ipl_scp_data_attr = {
292 .attr = {
293 .name = "scp_data",
294 .mode = S_IRUGO,
295 .owner = THIS_MODULE,
296 },
297 .size = PAGE_SIZE,
298 .read = &ipl_scp_data_read,
299 };
300
301 /* FCP ipl device attributes */
302
303 DEFINE_IPL_ATTR_RO(ipl_fcp, wwpn, "0x%016llx\n", (unsigned long long)
304 IPL_PARMBLOCK_START->ipl_info.fcp.wwpn);
305 DEFINE_IPL_ATTR_RO(ipl_fcp, lun, "0x%016llx\n", (unsigned long long)
306 IPL_PARMBLOCK_START->ipl_info.fcp.lun);
307 DEFINE_IPL_ATTR_RO(ipl_fcp, bootprog, "%lld\n", (unsigned long long)
308 IPL_PARMBLOCK_START->ipl_info.fcp.bootprog);
309 DEFINE_IPL_ATTR_RO(ipl_fcp, br_lba, "%lld\n", (unsigned long long)
310 IPL_PARMBLOCK_START->ipl_info.fcp.br_lba);
311
312 static struct attribute *ipl_fcp_attrs[] = {
313 &sys_ipl_type_attr.attr,
314 &sys_ipl_device_attr.attr,
315 &sys_ipl_fcp_wwpn_attr.attr,
316 &sys_ipl_fcp_lun_attr.attr,
317 &sys_ipl_fcp_bootprog_attr.attr,
318 &sys_ipl_fcp_br_lba_attr.attr,
319 NULL,
320 };
321
322 static struct attribute_group ipl_fcp_attr_group = {
323 .attrs = ipl_fcp_attrs,
324 };
325
326 /* CCW ipl device attributes */
327
328 static ssize_t ipl_ccw_loadparm_show(struct subsystem *subsys, char *page)
329 {
330 char loadparm[LOADPARM_LEN + 1] = {};
331
332 if (!SCCB_VALID)
333 return sprintf(page, "#unknown#\n");
334 memcpy(loadparm, SCCB_LOADPARM, LOADPARM_LEN);
335 EBCASC(loadparm, LOADPARM_LEN);
336 strstrip(loadparm);
337 return sprintf(page, "%s\n", loadparm);
338 }
339
340 static struct subsys_attribute sys_ipl_ccw_loadparm_attr =
341 __ATTR(loadparm, 0444, ipl_ccw_loadparm_show, NULL);
342
343 static struct attribute *ipl_ccw_attrs[] = {
344 &sys_ipl_type_attr.attr,
345 &sys_ipl_device_attr.attr,
346 &sys_ipl_ccw_loadparm_attr.attr,
347 NULL,
348 };
349
350 static struct attribute_group ipl_ccw_attr_group = {
351 .attrs = ipl_ccw_attrs,
352 };
353
354 /* NSS ipl device attributes */
355
356 DEFINE_IPL_ATTR_RO(ipl_nss, name, "%s\n", kernel_nss_name);
357
358 static struct attribute *ipl_nss_attrs[] = {
359 &sys_ipl_type_attr.attr,
360 &sys_ipl_nss_name_attr.attr,
361 NULL,
362 };
363
364 static struct attribute_group ipl_nss_attr_group = {
365 .attrs = ipl_nss_attrs,
366 };
367
368 /* UNKNOWN ipl device attributes */
369
370 static struct attribute *ipl_unknown_attrs[] = {
371 &sys_ipl_type_attr.attr,
372 NULL,
373 };
374
375 static struct attribute_group ipl_unknown_attr_group = {
376 .attrs = ipl_unknown_attrs,
377 };
378
379 static decl_subsys(ipl, NULL, NULL);
380
381 /*
382 * reipl section
383 */
384
385 /* FCP reipl device attributes */
386
387 DEFINE_IPL_ATTR_RW(reipl_fcp, wwpn, "0x%016llx\n", "%016llx\n",
388 reipl_block_fcp->ipl_info.fcp.wwpn);
389 DEFINE_IPL_ATTR_RW(reipl_fcp, lun, "0x%016llx\n", "%016llx\n",
390 reipl_block_fcp->ipl_info.fcp.lun);
391 DEFINE_IPL_ATTR_RW(reipl_fcp, bootprog, "%lld\n", "%lld\n",
392 reipl_block_fcp->ipl_info.fcp.bootprog);
393 DEFINE_IPL_ATTR_RW(reipl_fcp, br_lba, "%lld\n", "%lld\n",
394 reipl_block_fcp->ipl_info.fcp.br_lba);
395 DEFINE_IPL_ATTR_RW(reipl_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
396 reipl_block_fcp->ipl_info.fcp.devno);
397
398 static struct attribute *reipl_fcp_attrs[] = {
399 &sys_reipl_fcp_device_attr.attr,
400 &sys_reipl_fcp_wwpn_attr.attr,
401 &sys_reipl_fcp_lun_attr.attr,
402 &sys_reipl_fcp_bootprog_attr.attr,
403 &sys_reipl_fcp_br_lba_attr.attr,
404 NULL,
405 };
406
407 static struct attribute_group reipl_fcp_attr_group = {
408 .name = IPL_FCP_STR,
409 .attrs = reipl_fcp_attrs,
410 };
411
412 /* CCW reipl device attributes */
413
414 DEFINE_IPL_ATTR_RW(reipl_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
415 reipl_block_ccw->ipl_info.ccw.devno);
416
417 static void reipl_get_ascii_loadparm(char *loadparm)
418 {
419 memcpy(loadparm, &reipl_block_ccw->ipl_info.ccw.load_param,
420 LOADPARM_LEN);
421 EBCASC(loadparm, LOADPARM_LEN);
422 loadparm[LOADPARM_LEN] = 0;
423 strstrip(loadparm);
424 }
425
426 static ssize_t reipl_ccw_loadparm_show(struct subsystem *subsys, char *page)
427 {
428 char buf[LOADPARM_LEN + 1];
429
430 reipl_get_ascii_loadparm(buf);
431 return sprintf(page, "%s\n", buf);
432 }
433
434 static ssize_t reipl_ccw_loadparm_store(struct subsystem *subsys,
435 const char *buf, size_t len)
436 {
437 int i, lp_len;
438
439 /* ignore trailing newline */
440 lp_len = len;
441 if ((len > 0) && (buf[len - 1] == '\n'))
442 lp_len--;
443 /* loadparm can have max 8 characters and must not start with a blank */
444 if ((lp_len > LOADPARM_LEN) || ((lp_len > 0) && (buf[0] == ' ')))
445 return -EINVAL;
446 /* loadparm can only contain "a-z,A-Z,0-9,SP,." */
447 for (i = 0; i < lp_len; i++) {
448 if (isalpha(buf[i]) || isdigit(buf[i]) || (buf[i] == ' ') ||
449 (buf[i] == '.'))
450 continue;
451 return -EINVAL;
452 }
453 /* initialize loadparm with blanks */
454 memset(&reipl_block_ccw->ipl_info.ccw.load_param, ' ', LOADPARM_LEN);
455 /* copy and convert to ebcdic */
456 memcpy(&reipl_block_ccw->ipl_info.ccw.load_param, buf, lp_len);
457 ASCEBC(reipl_block_ccw->ipl_info.ccw.load_param, LOADPARM_LEN);
458 return len;
459 }
460
461 static struct subsys_attribute sys_reipl_ccw_loadparm_attr =
462 __ATTR(loadparm, 0644, reipl_ccw_loadparm_show,
463 reipl_ccw_loadparm_store);
464
465 static struct attribute *reipl_ccw_attrs[] = {
466 &sys_reipl_ccw_device_attr.attr,
467 &sys_reipl_ccw_loadparm_attr.attr,
468 NULL,
469 };
470
471 static struct attribute_group reipl_ccw_attr_group = {
472 .name = IPL_CCW_STR,
473 .attrs = reipl_ccw_attrs,
474 };
475
476
477 /* NSS reipl device attributes */
478
479 DEFINE_IPL_ATTR_STR_RW(reipl_nss, name, "%s\n", "%s\n", reipl_nss_name);
480
481 static struct attribute *reipl_nss_attrs[] = {
482 &sys_reipl_nss_name_attr.attr,
483 NULL,
484 };
485
486 static struct attribute_group reipl_nss_attr_group = {
487 .name = IPL_NSS_STR,
488 .attrs = reipl_nss_attrs,
489 };
490
491 /* reipl type */
492
493 static int reipl_set_type(enum ipl_type type)
494 {
495 if (!(reipl_capabilities & type))
496 return -EINVAL;
497
498 switch(type) {
499 case IPL_TYPE_CCW:
500 if (MACHINE_IS_VM)
501 reipl_method = IPL_METHOD_CCW_VM;
502 else
503 reipl_method = IPL_METHOD_CCW_CIO;
504 break;
505 case IPL_TYPE_FCP:
506 if (diag308_set_works)
507 reipl_method = IPL_METHOD_FCP_RW_DIAG;
508 else if (MACHINE_IS_VM)
509 reipl_method = IPL_METHOD_FCP_RO_VM;
510 else
511 reipl_method = IPL_METHOD_FCP_RO_DIAG;
512 break;
513 case IPL_TYPE_NSS:
514 reipl_method = IPL_METHOD_NSS;
515 break;
516 default:
517 reipl_method = IPL_METHOD_NONE;
518 }
519 reipl_type = type;
520 return 0;
521 }
522
523 static ssize_t reipl_type_show(struct subsystem *subsys, char *page)
524 {
525 return sprintf(page, "%s\n", ipl_type_str(reipl_type));
526 }
527
528 static ssize_t reipl_type_store(struct subsystem *subsys, const char *buf,
529 size_t len)
530 {
531 int rc = -EINVAL;
532
533 if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
534 rc = reipl_set_type(IPL_TYPE_CCW);
535 else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
536 rc = reipl_set_type(IPL_TYPE_FCP);
537 else if (strncmp(buf, IPL_NSS_STR, strlen(IPL_NSS_STR)) == 0)
538 rc = reipl_set_type(IPL_TYPE_NSS);
539 return (rc != 0) ? rc : len;
540 }
541
542 static struct subsys_attribute reipl_type_attr =
543 __ATTR(reipl_type, 0644, reipl_type_show, reipl_type_store);
544
545 static decl_subsys(reipl, NULL, NULL);
546
547 /*
548 * dump section
549 */
550
551 /* FCP dump device attributes */
552
553 DEFINE_IPL_ATTR_RW(dump_fcp, wwpn, "0x%016llx\n", "%016llx\n",
554 dump_block_fcp->ipl_info.fcp.wwpn);
555 DEFINE_IPL_ATTR_RW(dump_fcp, lun, "0x%016llx\n", "%016llx\n",
556 dump_block_fcp->ipl_info.fcp.lun);
557 DEFINE_IPL_ATTR_RW(dump_fcp, bootprog, "%lld\n", "%lld\n",
558 dump_block_fcp->ipl_info.fcp.bootprog);
559 DEFINE_IPL_ATTR_RW(dump_fcp, br_lba, "%lld\n", "%lld\n",
560 dump_block_fcp->ipl_info.fcp.br_lba);
561 DEFINE_IPL_ATTR_RW(dump_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
562 dump_block_fcp->ipl_info.fcp.devno);
563
564 static struct attribute *dump_fcp_attrs[] = {
565 &sys_dump_fcp_device_attr.attr,
566 &sys_dump_fcp_wwpn_attr.attr,
567 &sys_dump_fcp_lun_attr.attr,
568 &sys_dump_fcp_bootprog_attr.attr,
569 &sys_dump_fcp_br_lba_attr.attr,
570 NULL,
571 };
572
573 static struct attribute_group dump_fcp_attr_group = {
574 .name = IPL_FCP_STR,
575 .attrs = dump_fcp_attrs,
576 };
577
578 /* CCW dump device attributes */
579
580 DEFINE_IPL_ATTR_RW(dump_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
581 dump_block_ccw->ipl_info.ccw.devno);
582
583 static struct attribute *dump_ccw_attrs[] = {
584 &sys_dump_ccw_device_attr.attr,
585 NULL,
586 };
587
588 static struct attribute_group dump_ccw_attr_group = {
589 .name = IPL_CCW_STR,
590 .attrs = dump_ccw_attrs,
591 };
592
593 /* dump type */
594
595 static int dump_set_type(enum ipl_type type)
596 {
597 if (!(dump_capabilities & type))
598 return -EINVAL;
599 switch(type) {
600 case IPL_TYPE_CCW:
601 if (MACHINE_IS_VM)
602 dump_method = IPL_METHOD_CCW_VM;
603 else
604 dump_method = IPL_METHOD_CCW_CIO;
605 break;
606 case IPL_TYPE_FCP:
607 dump_method = IPL_METHOD_FCP_RW_DIAG;
608 break;
609 default:
610 dump_method = IPL_METHOD_NONE;
611 }
612 dump_type = type;
613 return 0;
614 }
615
616 static ssize_t dump_type_show(struct subsystem *subsys, char *page)
617 {
618 return sprintf(page, "%s\n", ipl_type_str(dump_type));
619 }
620
621 static ssize_t dump_type_store(struct subsystem *subsys, const char *buf,
622 size_t len)
623 {
624 int rc = -EINVAL;
625
626 if (strncmp(buf, IPL_NONE_STR, strlen(IPL_NONE_STR)) == 0)
627 rc = dump_set_type(IPL_TYPE_NONE);
628 else if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
629 rc = dump_set_type(IPL_TYPE_CCW);
630 else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
631 rc = dump_set_type(IPL_TYPE_FCP);
632 return (rc != 0) ? rc : len;
633 }
634
635 static struct subsys_attribute dump_type_attr =
636 __ATTR(dump_type, 0644, dump_type_show, dump_type_store);
637
638 static decl_subsys(dump, NULL, NULL);
639
640 /*
641 * Shutdown actions section
642 */
643
644 static decl_subsys(shutdown_actions, NULL, NULL);
645
646 /* on panic */
647
648 static ssize_t on_panic_show(struct subsystem *subsys, char *page)
649 {
650 return sprintf(page, "%s\n", shutdown_action_str(on_panic_action));
651 }
652
653 static ssize_t on_panic_store(struct subsystem *subsys, const char *buf,
654 size_t len)
655 {
656 if (strncmp(buf, SHUTDOWN_REIPL_STR, strlen(SHUTDOWN_REIPL_STR)) == 0)
657 on_panic_action = SHUTDOWN_REIPL;
658 else if (strncmp(buf, SHUTDOWN_DUMP_STR,
659 strlen(SHUTDOWN_DUMP_STR)) == 0)
660 on_panic_action = SHUTDOWN_DUMP;
661 else if (strncmp(buf, SHUTDOWN_STOP_STR,
662 strlen(SHUTDOWN_STOP_STR)) == 0)
663 on_panic_action = SHUTDOWN_STOP;
664 else
665 return -EINVAL;
666
667 return len;
668 }
669
670 static struct subsys_attribute on_panic_attr =
671 __ATTR(on_panic, 0644, on_panic_show, on_panic_store);
672
673 void do_reipl(void)
674 {
675 struct ccw_dev_id devid;
676 static char buf[100];
677 char loadparm[LOADPARM_LEN + 1];
678
679 switch (reipl_method) {
680 case IPL_METHOD_CCW_CIO:
681 devid.devno = reipl_block_ccw->ipl_info.ccw.devno;
682 if (ipl_get_type() == IPL_TYPE_CCW && devid.devno == ipl_devno)
683 diag308(DIAG308_IPL, NULL);
684 devid.ssid = 0;
685 reipl_ccw_dev(&devid);
686 break;
687 case IPL_METHOD_CCW_VM:
688 reipl_get_ascii_loadparm(loadparm);
689 if (strlen(loadparm) == 0)
690 sprintf(buf, "IPL %X",
691 reipl_block_ccw->ipl_info.ccw.devno);
692 else
693 sprintf(buf, "IPL %X LOADPARM '%s'",
694 reipl_block_ccw->ipl_info.ccw.devno, loadparm);
695 __cpcmd(buf, NULL, 0, NULL);
696 break;
697 case IPL_METHOD_CCW_DIAG:
698 diag308(DIAG308_SET, reipl_block_ccw);
699 diag308(DIAG308_IPL, NULL);
700 break;
701 case IPL_METHOD_FCP_RW_DIAG:
702 diag308(DIAG308_SET, reipl_block_fcp);
703 diag308(DIAG308_IPL, NULL);
704 break;
705 case IPL_METHOD_FCP_RO_DIAG:
706 diag308(DIAG308_IPL, NULL);
707 break;
708 case IPL_METHOD_FCP_RO_VM:
709 __cpcmd("IPL", NULL, 0, NULL);
710 break;
711 case IPL_METHOD_NSS:
712 sprintf(buf, "IPL %s", reipl_nss_name);
713 __cpcmd(buf, NULL, 0, NULL);
714 break;
715 case IPL_METHOD_NONE:
716 default:
717 if (MACHINE_IS_VM)
718 __cpcmd("IPL", NULL, 0, NULL);
719 diag308(DIAG308_IPL, NULL);
720 break;
721 }
722 signal_processor(smp_processor_id(), sigp_stop_and_store_status);
723 }
724
725 static void do_dump(void)
726 {
727 struct ccw_dev_id devid;
728 static char buf[100];
729
730 switch (dump_method) {
731 case IPL_METHOD_CCW_CIO:
732 smp_send_stop();
733 devid.devno = dump_block_ccw->ipl_info.ccw.devno;
734 devid.ssid = 0;
735 reipl_ccw_dev(&devid);
736 break;
737 case IPL_METHOD_CCW_VM:
738 smp_send_stop();
739 sprintf(buf, "STORE STATUS");
740 __cpcmd(buf, NULL, 0, NULL);
741 sprintf(buf, "IPL %X", dump_block_ccw->ipl_info.ccw.devno);
742 __cpcmd(buf, NULL, 0, NULL);
743 break;
744 case IPL_METHOD_CCW_DIAG:
745 diag308(DIAG308_SET, dump_block_ccw);
746 diag308(DIAG308_DUMP, NULL);
747 break;
748 case IPL_METHOD_FCP_RW_DIAG:
749 diag308(DIAG308_SET, dump_block_fcp);
750 diag308(DIAG308_DUMP, NULL);
751 break;
752 case IPL_METHOD_NONE:
753 default:
754 return;
755 }
756 printk(KERN_EMERG "Dump failed!\n");
757 }
758
759 /* init functions */
760
761 static int __init ipl_register_fcp_files(void)
762 {
763 int rc;
764
765 rc = sysfs_create_group(&ipl_subsys.kset.kobj,
766 &ipl_fcp_attr_group);
767 if (rc)
768 goto out;
769 rc = sysfs_create_bin_file(&ipl_subsys.kset.kobj,
770 &ipl_parameter_attr);
771 if (rc)
772 goto out_ipl_parm;
773 rc = sysfs_create_bin_file(&ipl_subsys.kset.kobj,
774 &ipl_scp_data_attr);
775 if (!rc)
776 goto out;
777
778 sysfs_remove_bin_file(&ipl_subsys.kset.kobj, &ipl_parameter_attr);
779
780 out_ipl_parm:
781 sysfs_remove_group(&ipl_subsys.kset.kobj, &ipl_fcp_attr_group);
782 out:
783 return rc;
784 }
785
786 static int __init ipl_init(void)
787 {
788 int rc;
789
790 rc = firmware_register(&ipl_subsys);
791 if (rc)
792 return rc;
793 switch (ipl_get_type()) {
794 case IPL_TYPE_CCW:
795 rc = sysfs_create_group(&ipl_subsys.kset.kobj,
796 &ipl_ccw_attr_group);
797 break;
798 case IPL_TYPE_FCP:
799 rc = ipl_register_fcp_files();
800 break;
801 case IPL_TYPE_NSS:
802 rc = sysfs_create_group(&ipl_subsys.kset.kobj,
803 &ipl_nss_attr_group);
804 break;
805 default:
806 rc = sysfs_create_group(&ipl_subsys.kset.kobj,
807 &ipl_unknown_attr_group);
808 break;
809 }
810 if (rc)
811 firmware_unregister(&ipl_subsys);
812 return rc;
813 }
814
815 static void __init reipl_probe(void)
816 {
817 void *buffer;
818
819 buffer = (void *) get_zeroed_page(GFP_KERNEL);
820 if (!buffer)
821 return;
822 if (diag308(DIAG308_STORE, buffer) == DIAG308_RC_OK)
823 diag308_set_works = 1;
824 free_page((unsigned long)buffer);
825 }
826
827 static int __init reipl_nss_init(void)
828 {
829 int rc;
830
831 if (!MACHINE_IS_VM)
832 return 0;
833 rc = sysfs_create_group(&reipl_subsys.kset.kobj, &reipl_nss_attr_group);
834 if (rc)
835 return rc;
836 strncpy(reipl_nss_name, kernel_nss_name, NSS_NAME_SIZE + 1);
837 reipl_capabilities |= IPL_TYPE_NSS;
838 return 0;
839 }
840
841 static int __init reipl_ccw_init(void)
842 {
843 int rc;
844
845 reipl_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
846 if (!reipl_block_ccw)
847 return -ENOMEM;
848 rc = sysfs_create_group(&reipl_subsys.kset.kobj, &reipl_ccw_attr_group);
849 if (rc) {
850 free_page((unsigned long)reipl_block_ccw);
851 return rc;
852 }
853 reipl_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
854 reipl_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
855 reipl_block_ccw->hdr.blk0_len = sizeof(reipl_block_ccw->ipl_info.ccw);
856 reipl_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
857 /* check if read scp info worked and set loadparm */
858 if (SCCB_VALID)
859 memcpy(reipl_block_ccw->ipl_info.ccw.load_param,
860 SCCB_LOADPARM, LOADPARM_LEN);
861 else
862 /* read scp info failed: set empty loadparm (EBCDIC blanks) */
863 memset(reipl_block_ccw->ipl_info.ccw.load_param, 0x40,
864 LOADPARM_LEN);
865 /* FIXME: check for diag308_set_works when enabling diag ccw reipl */
866 if (!MACHINE_IS_VM)
867 sys_reipl_ccw_loadparm_attr.attr.mode = S_IRUGO;
868 if (ipl_get_type() == IPL_TYPE_CCW)
869 reipl_block_ccw->ipl_info.ccw.devno = ipl_devno;
870 reipl_capabilities |= IPL_TYPE_CCW;
871 return 0;
872 }
873
874 static int __init reipl_fcp_init(void)
875 {
876 int rc;
877
878 if ((!diag308_set_works) && (ipl_get_type() != IPL_TYPE_FCP))
879 return 0;
880 if ((!diag308_set_works) && (ipl_get_type() == IPL_TYPE_FCP))
881 make_attrs_ro(reipl_fcp_attrs);
882
883 reipl_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
884 if (!reipl_block_fcp)
885 return -ENOMEM;
886 rc = sysfs_create_group(&reipl_subsys.kset.kobj, &reipl_fcp_attr_group);
887 if (rc) {
888 free_page((unsigned long)reipl_block_fcp);
889 return rc;
890 }
891 if (ipl_get_type() == IPL_TYPE_FCP) {
892 memcpy(reipl_block_fcp, IPL_PARMBLOCK_START, PAGE_SIZE);
893 } else {
894 reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
895 reipl_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
896 reipl_block_fcp->hdr.blk0_len =
897 sizeof(reipl_block_fcp->ipl_info.fcp);
898 reipl_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
899 reipl_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_IPL;
900 }
901 reipl_capabilities |= IPL_TYPE_FCP;
902 return 0;
903 }
904
905 static int __init reipl_init(void)
906 {
907 int rc;
908
909 rc = firmware_register(&reipl_subsys);
910 if (rc)
911 return rc;
912 rc = subsys_create_file(&reipl_subsys, &reipl_type_attr);
913 if (rc) {
914 firmware_unregister(&reipl_subsys);
915 return rc;
916 }
917 rc = reipl_ccw_init();
918 if (rc)
919 return rc;
920 rc = reipl_fcp_init();
921 if (rc)
922 return rc;
923 rc = reipl_nss_init();
924 if (rc)
925 return rc;
926 rc = reipl_set_type(ipl_get_type());
927 if (rc)
928 return rc;
929 return 0;
930 }
931
932 static int __init dump_ccw_init(void)
933 {
934 int rc;
935
936 dump_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
937 if (!dump_block_ccw)
938 return -ENOMEM;
939 rc = sysfs_create_group(&dump_subsys.kset.kobj, &dump_ccw_attr_group);
940 if (rc) {
941 free_page((unsigned long)dump_block_ccw);
942 return rc;
943 }
944 dump_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
945 dump_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
946 dump_block_ccw->hdr.blk0_len = sizeof(reipl_block_ccw->ipl_info.ccw);
947 dump_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
948 dump_capabilities |= IPL_TYPE_CCW;
949 return 0;
950 }
951
952 static int __init dump_fcp_init(void)
953 {
954 int rc;
955
956 if(!(SCCB_FLAG & 0x2) || !SCCB_VALID)
957 return 0; /* LDIPL DUMP is not installed */
958 if (!diag308_set_works)
959 return 0;
960 dump_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
961 if (!dump_block_fcp)
962 return -ENOMEM;
963 rc = sysfs_create_group(&dump_subsys.kset.kobj, &dump_fcp_attr_group);
964 if (rc) {
965 free_page((unsigned long)dump_block_fcp);
966 return rc;
967 }
968 dump_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
969 dump_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
970 dump_block_fcp->hdr.blk0_len = sizeof(dump_block_fcp->ipl_info.fcp);
971 dump_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
972 dump_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_DUMP;
973 dump_capabilities |= IPL_TYPE_FCP;
974 return 0;
975 }
976
977 #define SHUTDOWN_ON_PANIC_PRIO 0
978
979 static int shutdown_on_panic_notify(struct notifier_block *self,
980 unsigned long event, void *data)
981 {
982 if (on_panic_action == SHUTDOWN_DUMP)
983 do_dump();
984 else if (on_panic_action == SHUTDOWN_REIPL)
985 do_reipl();
986 return NOTIFY_OK;
987 }
988
989 static struct notifier_block shutdown_on_panic_nb = {
990 .notifier_call = shutdown_on_panic_notify,
991 .priority = SHUTDOWN_ON_PANIC_PRIO
992 };
993
994 static int __init dump_init(void)
995 {
996 int rc;
997
998 rc = firmware_register(&dump_subsys);
999 if (rc)
1000 return rc;
1001 rc = subsys_create_file(&dump_subsys, &dump_type_attr);
1002 if (rc) {
1003 firmware_unregister(&dump_subsys);
1004 return rc;
1005 }
1006 rc = dump_ccw_init();
1007 if (rc)
1008 return rc;
1009 rc = dump_fcp_init();
1010 if (rc)
1011 return rc;
1012 dump_set_type(IPL_TYPE_NONE);
1013 return 0;
1014 }
1015
1016 static int __init shutdown_actions_init(void)
1017 {
1018 int rc;
1019
1020 rc = firmware_register(&shutdown_actions_subsys);
1021 if (rc)
1022 return rc;
1023 rc = subsys_create_file(&shutdown_actions_subsys, &on_panic_attr);
1024 if (rc) {
1025 firmware_unregister(&shutdown_actions_subsys);
1026 return rc;
1027 }
1028 atomic_notifier_chain_register(&panic_notifier_list,
1029 &shutdown_on_panic_nb);
1030 return 0;
1031 }
1032
1033 static int __init s390_ipl_init(void)
1034 {
1035 int rc;
1036
1037 reipl_probe();
1038 rc = ipl_init();
1039 if (rc)
1040 return rc;
1041 rc = reipl_init();
1042 if (rc)
1043 return rc;
1044 rc = dump_init();
1045 if (rc)
1046 return rc;
1047 rc = shutdown_actions_init();
1048 if (rc)
1049 return rc;
1050 return 0;
1051 }
1052
1053 __initcall(s390_ipl_init);
1054
1055 static LIST_HEAD(rcall);
1056 static DEFINE_MUTEX(rcall_mutex);
1057
1058 void register_reset_call(struct reset_call *reset)
1059 {
1060 mutex_lock(&rcall_mutex);
1061 list_add(&reset->list, &rcall);
1062 mutex_unlock(&rcall_mutex);
1063 }
1064 EXPORT_SYMBOL_GPL(register_reset_call);
1065
1066 void unregister_reset_call(struct reset_call *reset)
1067 {
1068 mutex_lock(&rcall_mutex);
1069 list_del(&reset->list);
1070 mutex_unlock(&rcall_mutex);
1071 }
1072 EXPORT_SYMBOL_GPL(unregister_reset_call);
1073
1074 static void do_reset_calls(void)
1075 {
1076 struct reset_call *reset;
1077
1078 list_for_each_entry(reset, &rcall, list)
1079 reset->fn();
1080 }
1081
1082 extern __u32 dump_prefix_page;
1083
1084 void s390_reset_system(void)
1085 {
1086 struct _lowcore *lc;
1087
1088 lc = (struct _lowcore *)(unsigned long) store_prefix();
1089
1090 /* Stack for interrupt/machine check handler */
1091 lc->panic_stack = S390_lowcore.panic_stack;
1092
1093 /* Save prefix page address for dump case */
1094 dump_prefix_page = (unsigned long) lc;
1095
1096 /* Disable prefixing */
1097 set_prefix(0);
1098
1099 /* Disable lowcore protection */
1100 __ctl_clear_bit(0,28);
1101
1102 /* Set new machine check handler */
1103 S390_lowcore.mcck_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
1104 S390_lowcore.mcck_new_psw.addr =
1105 PSW_ADDR_AMODE | (unsigned long) s390_base_mcck_handler;
1106
1107 /* Set new program check handler */
1108 S390_lowcore.program_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
1109 S390_lowcore.program_new_psw.addr =
1110 PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
1111
1112 do_reset_calls();
1113 }
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