Pull acpi-debug into release branch
[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 (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/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 static char *ipl_type_str(enum ipl_type type)
35 {
36         switch (type) {
37         case IPL_TYPE_CCW:
38                 return IPL_CCW_STR;
39         case IPL_TYPE_FCP:
40                 return IPL_FCP_STR;
41         case IPL_TYPE_FCP_DUMP:
42                 return IPL_FCP_DUMP_STR;
43         case IPL_TYPE_NSS:
44                 return IPL_NSS_STR;
45         case IPL_TYPE_UNKNOWN:
46         default:
47                 return IPL_UNKNOWN_STR;
48         }
49 }
50
51 enum dump_type {
52         DUMP_TYPE_NONE  = 1,
53         DUMP_TYPE_CCW   = 2,
54         DUMP_TYPE_FCP   = 4,
55 };
56
57 #define DUMP_NONE_STR    "none"
58 #define DUMP_CCW_STR     "ccw"
59 #define DUMP_FCP_STR     "fcp"
60
61 static char *dump_type_str(enum dump_type type)
62 {
63         switch (type) {
64         case DUMP_TYPE_NONE:
65                 return DUMP_NONE_STR;
66         case DUMP_TYPE_CCW:
67                 return DUMP_CCW_STR;
68         case DUMP_TYPE_FCP:
69                 return DUMP_FCP_STR;
70         default:
71                 return NULL;
72         }
73 }
74
75 /*
76  * Must be in data section since the bss section
77  * is not cleared when these are accessed.
78  */
79 static u16 ipl_devno __attribute__((__section__(".data"))) = 0;
80 u32 ipl_flags __attribute__((__section__(".data"))) = 0;
81
82 enum ipl_method {
83         REIPL_METHOD_CCW_CIO,
84         REIPL_METHOD_CCW_DIAG,
85         REIPL_METHOD_CCW_VM,
86         REIPL_METHOD_FCP_RO_DIAG,
87         REIPL_METHOD_FCP_RW_DIAG,
88         REIPL_METHOD_FCP_RO_VM,
89         REIPL_METHOD_FCP_DUMP,
90         REIPL_METHOD_NSS,
91         REIPL_METHOD_DEFAULT,
92 };
93
94 enum dump_method {
95         DUMP_METHOD_NONE,
96         DUMP_METHOD_CCW_CIO,
97         DUMP_METHOD_CCW_DIAG,
98         DUMP_METHOD_CCW_VM,
99         DUMP_METHOD_FCP_DIAG,
100 };
101
102 enum shutdown_action {
103         SHUTDOWN_REIPL,
104         SHUTDOWN_DUMP,
105         SHUTDOWN_STOP,
106 };
107
108 #define SHUTDOWN_REIPL_STR "reipl"
109 #define SHUTDOWN_DUMP_STR  "dump"
110 #define SHUTDOWN_STOP_STR  "stop"
111
112 static char *shutdown_action_str(enum shutdown_action action)
113 {
114         switch (action) {
115         case SHUTDOWN_REIPL:
116                 return SHUTDOWN_REIPL_STR;
117         case SHUTDOWN_DUMP:
118                 return SHUTDOWN_DUMP_STR;
119         case SHUTDOWN_STOP:
120                 return SHUTDOWN_STOP_STR;
121         default:
122                 return NULL;
123         }
124 }
125
126 static int diag308_set_works = 0;
127
128 static int reipl_capabilities = IPL_TYPE_UNKNOWN;
129
130 static enum ipl_type reipl_type = IPL_TYPE_UNKNOWN;
131 static enum ipl_method reipl_method = REIPL_METHOD_DEFAULT;
132 static struct ipl_parameter_block *reipl_block_fcp;
133 static struct ipl_parameter_block *reipl_block_ccw;
134
135 static char reipl_nss_name[NSS_NAME_SIZE + 1];
136
137 static int dump_capabilities = DUMP_TYPE_NONE;
138 static enum dump_type dump_type = DUMP_TYPE_NONE;
139 static enum dump_method dump_method = DUMP_METHOD_NONE;
140 static struct ipl_parameter_block *dump_block_fcp;
141 static struct ipl_parameter_block *dump_block_ccw;
142
143 static enum shutdown_action on_panic_action = SHUTDOWN_STOP;
144
145 static struct sclp_ipl_info sclp_ipl_info;
146
147 int diag308(unsigned long subcode, void *addr)
148 {
149         register unsigned long _addr asm("0") = (unsigned long) addr;
150         register unsigned long _rc asm("1") = 0;
151
152         asm volatile(
153                 "       diag    %0,%2,0x308\n"
154                 "0:\n"
155                 EX_TABLE(0b,0b)
156                 : "+d" (_addr), "+d" (_rc)
157                 : "d" (subcode) : "cc", "memory");
158         return _rc;
159 }
160 EXPORT_SYMBOL_GPL(diag308);
161
162 /* SYSFS */
163
164 #define DEFINE_IPL_ATTR_RO(_prefix, _name, _format, _value)             \
165 static ssize_t sys_##_prefix##_##_name##_show(struct kset *kset,        \
166                 char *page)                                             \
167 {                                                                       \
168         return sprintf(page, _format, _value);                          \
169 }                                                                       \
170 static struct subsys_attribute sys_##_prefix##_##_name##_attr =         \
171         __ATTR(_name, S_IRUGO, sys_##_prefix##_##_name##_show, NULL);
172
173 #define DEFINE_IPL_ATTR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)   \
174 static ssize_t sys_##_prefix##_##_name##_show(struct kset *kset,        \
175                 char *page)                                             \
176 {                                                                       \
177         return sprintf(page, _fmt_out,                                  \
178                         (unsigned long long) _value);                   \
179 }                                                                       \
180 static ssize_t sys_##_prefix##_##_name##_store(struct kset *kset,       \
181                 const char *buf, size_t len)                            \
182 {                                                                       \
183         unsigned long long value;                                       \
184         if (sscanf(buf, _fmt_in, &value) != 1)                          \
185                 return -EINVAL;                                         \
186         _value = value;                                                 \
187         return len;                                                     \
188 }                                                                       \
189 static struct subsys_attribute sys_##_prefix##_##_name##_attr =         \
190         __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
191                         sys_##_prefix##_##_name##_show,                 \
192                         sys_##_prefix##_##_name##_store);
193
194 #define DEFINE_IPL_ATTR_STR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)\
195 static ssize_t sys_##_prefix##_##_name##_show(struct kset *kset,        \
196                 char *page)                                             \
197 {                                                                       \
198         return sprintf(page, _fmt_out, _value);                         \
199 }                                                                       \
200 static ssize_t sys_##_prefix##_##_name##_store(struct kset *kset,       \
201                 const char *buf, size_t len)                            \
202 {                                                                       \
203         if (sscanf(buf, _fmt_in, _value) != 1)                          \
204                 return -EINVAL;                                         \
205         return len;                                                     \
206 }                                                                       \
207 static struct subsys_attribute sys_##_prefix##_##_name##_attr =         \
208         __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
209                         sys_##_prefix##_##_name##_show,                 \
210                         sys_##_prefix##_##_name##_store);
211
212 static void make_attrs_ro(struct attribute **attrs)
213 {
214         while (*attrs) {
215                 (*attrs)->mode = S_IRUGO;
216                 attrs++;
217         }
218 }
219
220 /*
221  * ipl section
222  */
223
224 static __init enum ipl_type get_ipl_type(void)
225 {
226         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
227
228         if (ipl_flags & IPL_NSS_VALID)
229                 return IPL_TYPE_NSS;
230         if (!(ipl_flags & IPL_DEVNO_VALID))
231                 return IPL_TYPE_UNKNOWN;
232         if (!(ipl_flags & IPL_PARMBLOCK_VALID))
233                 return IPL_TYPE_CCW;
234         if (ipl->hdr.version > IPL_MAX_SUPPORTED_VERSION)
235                 return IPL_TYPE_UNKNOWN;
236         if (ipl->hdr.pbt != DIAG308_IPL_TYPE_FCP)
237                 return IPL_TYPE_UNKNOWN;
238         if (ipl->ipl_info.fcp.opt == DIAG308_IPL_OPT_DUMP)
239                 return IPL_TYPE_FCP_DUMP;
240         return IPL_TYPE_FCP;
241 }
242
243 void __init setup_ipl_info(void)
244 {
245         ipl_info.type = get_ipl_type();
246         switch (ipl_info.type) {
247         case IPL_TYPE_CCW:
248                 ipl_info.data.ccw.dev_id.devno = ipl_devno;
249                 ipl_info.data.ccw.dev_id.ssid = 0;
250                 break;
251         case IPL_TYPE_FCP:
252         case IPL_TYPE_FCP_DUMP:
253                 ipl_info.data.fcp.dev_id.devno =
254                         IPL_PARMBLOCK_START->ipl_info.fcp.devno;
255                 ipl_info.data.fcp.dev_id.ssid = 0;
256                 ipl_info.data.fcp.wwpn = IPL_PARMBLOCK_START->ipl_info.fcp.wwpn;
257                 ipl_info.data.fcp.lun = IPL_PARMBLOCK_START->ipl_info.fcp.lun;
258                 break;
259         case IPL_TYPE_NSS:
260                 strncpy(ipl_info.data.nss.name, kernel_nss_name,
261                         sizeof(ipl_info.data.nss.name));
262                 break;
263         case IPL_TYPE_UNKNOWN:
264         default:
265                 /* We have no info to copy */
266                 break;
267         }
268 }
269
270 struct ipl_info ipl_info;
271 EXPORT_SYMBOL_GPL(ipl_info);
272
273 static ssize_t ipl_type_show(struct kset *kset, char *page)
274 {
275         return sprintf(page, "%s\n", ipl_type_str(ipl_info.type));
276 }
277
278 static struct subsys_attribute sys_ipl_type_attr = __ATTR_RO(ipl_type);
279
280 static ssize_t sys_ipl_device_show(struct kset *kset, char *page)
281 {
282         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
283
284         switch (ipl_info.type) {
285         case IPL_TYPE_CCW:
286                 return sprintf(page, "0.0.%04x\n", ipl_devno);
287         case IPL_TYPE_FCP:
288         case IPL_TYPE_FCP_DUMP:
289                 return sprintf(page, "0.0.%04x\n", ipl->ipl_info.fcp.devno);
290         default:
291                 return 0;
292         }
293 }
294
295 static struct subsys_attribute sys_ipl_device_attr =
296         __ATTR(device, S_IRUGO, sys_ipl_device_show, NULL);
297
298 static ssize_t ipl_parameter_read(struct kobject *kobj, struct bin_attribute *attr,
299                                   char *buf, loff_t off, size_t count)
300 {
301         unsigned int size = IPL_PARMBLOCK_SIZE;
302
303         if (off > size)
304                 return 0;
305         if (off + count > size)
306                 count = size - off;
307         memcpy(buf, (void *)IPL_PARMBLOCK_START + off, count);
308         return count;
309 }
310
311 static struct bin_attribute ipl_parameter_attr = {
312         .attr = {
313                 .name = "binary_parameter",
314                 .mode = S_IRUGO,
315         },
316         .size = PAGE_SIZE,
317         .read = &ipl_parameter_read,
318 };
319
320 static ssize_t ipl_scp_data_read(struct kobject *kobj, struct bin_attribute *attr,
321                                  char *buf, loff_t off, size_t count)
322 {
323         unsigned int size = IPL_PARMBLOCK_START->ipl_info.fcp.scp_data_len;
324         void *scp_data = &IPL_PARMBLOCK_START->ipl_info.fcp.scp_data;
325
326         if (off > size)
327                 return 0;
328         if (off + count > size)
329                 count = size - off;
330         memcpy(buf, scp_data + off, count);
331         return count;
332 }
333
334 static struct bin_attribute ipl_scp_data_attr = {
335         .attr = {
336                 .name = "scp_data",
337                 .mode = S_IRUGO,
338         },
339         .size = PAGE_SIZE,
340         .read = ipl_scp_data_read,
341 };
342
343 /* FCP ipl device attributes */
344
345 DEFINE_IPL_ATTR_RO(ipl_fcp, wwpn, "0x%016llx\n", (unsigned long long)
346                    IPL_PARMBLOCK_START->ipl_info.fcp.wwpn);
347 DEFINE_IPL_ATTR_RO(ipl_fcp, lun, "0x%016llx\n", (unsigned long long)
348                    IPL_PARMBLOCK_START->ipl_info.fcp.lun);
349 DEFINE_IPL_ATTR_RO(ipl_fcp, bootprog, "%lld\n", (unsigned long long)
350                    IPL_PARMBLOCK_START->ipl_info.fcp.bootprog);
351 DEFINE_IPL_ATTR_RO(ipl_fcp, br_lba, "%lld\n", (unsigned long long)
352                    IPL_PARMBLOCK_START->ipl_info.fcp.br_lba);
353
354 static struct attribute *ipl_fcp_attrs[] = {
355         &sys_ipl_type_attr.attr,
356         &sys_ipl_device_attr.attr,
357         &sys_ipl_fcp_wwpn_attr.attr,
358         &sys_ipl_fcp_lun_attr.attr,
359         &sys_ipl_fcp_bootprog_attr.attr,
360         &sys_ipl_fcp_br_lba_attr.attr,
361         NULL,
362 };
363
364 static struct attribute_group ipl_fcp_attr_group = {
365         .attrs = ipl_fcp_attrs,
366 };
367
368 /* CCW ipl device attributes */
369
370 static ssize_t ipl_ccw_loadparm_show(struct kset *kset, char *page)
371 {
372         char loadparm[LOADPARM_LEN + 1] = {};
373
374         if (!sclp_ipl_info.is_valid)
375                 return sprintf(page, "#unknown#\n");
376         memcpy(loadparm, &sclp_ipl_info.loadparm, LOADPARM_LEN);
377         EBCASC(loadparm, LOADPARM_LEN);
378         strstrip(loadparm);
379         return sprintf(page, "%s\n", loadparm);
380 }
381
382 static struct subsys_attribute sys_ipl_ccw_loadparm_attr =
383         __ATTR(loadparm, 0444, ipl_ccw_loadparm_show, NULL);
384
385 static struct attribute *ipl_ccw_attrs[] = {
386         &sys_ipl_type_attr.attr,
387         &sys_ipl_device_attr.attr,
388         &sys_ipl_ccw_loadparm_attr.attr,
389         NULL,
390 };
391
392 static struct attribute_group ipl_ccw_attr_group = {
393         .attrs = ipl_ccw_attrs,
394 };
395
396 /* NSS ipl device attributes */
397
398 DEFINE_IPL_ATTR_RO(ipl_nss, name, "%s\n", kernel_nss_name);
399
400 static struct attribute *ipl_nss_attrs[] = {
401         &sys_ipl_type_attr.attr,
402         &sys_ipl_nss_name_attr.attr,
403         NULL,
404 };
405
406 static struct attribute_group ipl_nss_attr_group = {
407         .attrs = ipl_nss_attrs,
408 };
409
410 /* UNKNOWN ipl device attributes */
411
412 static struct attribute *ipl_unknown_attrs[] = {
413         &sys_ipl_type_attr.attr,
414         NULL,
415 };
416
417 static struct attribute_group ipl_unknown_attr_group = {
418         .attrs = ipl_unknown_attrs,
419 };
420
421 static decl_subsys(ipl, NULL, NULL);
422
423 /*
424  * reipl section
425  */
426
427 /* FCP reipl device attributes */
428
429 DEFINE_IPL_ATTR_RW(reipl_fcp, wwpn, "0x%016llx\n", "%016llx\n",
430                    reipl_block_fcp->ipl_info.fcp.wwpn);
431 DEFINE_IPL_ATTR_RW(reipl_fcp, lun, "0x%016llx\n", "%016llx\n",
432                    reipl_block_fcp->ipl_info.fcp.lun);
433 DEFINE_IPL_ATTR_RW(reipl_fcp, bootprog, "%lld\n", "%lld\n",
434                    reipl_block_fcp->ipl_info.fcp.bootprog);
435 DEFINE_IPL_ATTR_RW(reipl_fcp, br_lba, "%lld\n", "%lld\n",
436                    reipl_block_fcp->ipl_info.fcp.br_lba);
437 DEFINE_IPL_ATTR_RW(reipl_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
438                    reipl_block_fcp->ipl_info.fcp.devno);
439
440 static struct attribute *reipl_fcp_attrs[] = {
441         &sys_reipl_fcp_device_attr.attr,
442         &sys_reipl_fcp_wwpn_attr.attr,
443         &sys_reipl_fcp_lun_attr.attr,
444         &sys_reipl_fcp_bootprog_attr.attr,
445         &sys_reipl_fcp_br_lba_attr.attr,
446         NULL,
447 };
448
449 static struct attribute_group reipl_fcp_attr_group = {
450         .name  = IPL_FCP_STR,
451         .attrs = reipl_fcp_attrs,
452 };
453
454 /* CCW reipl device attributes */
455
456 DEFINE_IPL_ATTR_RW(reipl_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
457         reipl_block_ccw->ipl_info.ccw.devno);
458
459 static void reipl_get_ascii_loadparm(char *loadparm)
460 {
461         memcpy(loadparm, &reipl_block_ccw->ipl_info.ccw.load_param,
462                LOADPARM_LEN);
463         EBCASC(loadparm, LOADPARM_LEN);
464         loadparm[LOADPARM_LEN] = 0;
465         strstrip(loadparm);
466 }
467
468 static ssize_t reipl_ccw_loadparm_show(struct kset *kset, char *page)
469 {
470         char buf[LOADPARM_LEN + 1];
471
472         reipl_get_ascii_loadparm(buf);
473         return sprintf(page, "%s\n", buf);
474 }
475
476 static ssize_t reipl_ccw_loadparm_store(struct kset *kset,
477                                         const char *buf, size_t len)
478 {
479         int i, lp_len;
480
481         /* ignore trailing newline */
482         lp_len = len;
483         if ((len > 0) && (buf[len - 1] == '\n'))
484                 lp_len--;
485         /* loadparm can have max 8 characters and must not start with a blank */
486         if ((lp_len > LOADPARM_LEN) || ((lp_len > 0) && (buf[0] == ' ')))
487                 return -EINVAL;
488         /* loadparm can only contain "a-z,A-Z,0-9,SP,." */
489         for (i = 0; i < lp_len; i++) {
490                 if (isalpha(buf[i]) || isdigit(buf[i]) || (buf[i] == ' ') ||
491                     (buf[i] == '.'))
492                         continue;
493                 return -EINVAL;
494         }
495         /* initialize loadparm with blanks */
496         memset(&reipl_block_ccw->ipl_info.ccw.load_param, ' ', LOADPARM_LEN);
497         /* copy and convert to ebcdic */
498         memcpy(&reipl_block_ccw->ipl_info.ccw.load_param, buf, lp_len);
499         ASCEBC(reipl_block_ccw->ipl_info.ccw.load_param, LOADPARM_LEN);
500         return len;
501 }
502
503 static struct subsys_attribute sys_reipl_ccw_loadparm_attr =
504         __ATTR(loadparm, 0644, reipl_ccw_loadparm_show,
505                reipl_ccw_loadparm_store);
506
507 static struct attribute *reipl_ccw_attrs[] = {
508         &sys_reipl_ccw_device_attr.attr,
509         &sys_reipl_ccw_loadparm_attr.attr,
510         NULL,
511 };
512
513 static struct attribute_group reipl_ccw_attr_group = {
514         .name  = IPL_CCW_STR,
515         .attrs = reipl_ccw_attrs,
516 };
517
518
519 /* NSS reipl device attributes */
520
521 DEFINE_IPL_ATTR_STR_RW(reipl_nss, name, "%s\n", "%s\n", reipl_nss_name);
522
523 static struct attribute *reipl_nss_attrs[] = {
524         &sys_reipl_nss_name_attr.attr,
525         NULL,
526 };
527
528 static struct attribute_group reipl_nss_attr_group = {
529         .name  = IPL_NSS_STR,
530         .attrs = reipl_nss_attrs,
531 };
532
533 /* reipl type */
534
535 static int reipl_set_type(enum ipl_type type)
536 {
537         if (!(reipl_capabilities & type))
538                 return -EINVAL;
539
540         switch(type) {
541         case IPL_TYPE_CCW:
542                 if (MACHINE_IS_VM)
543                         reipl_method = REIPL_METHOD_CCW_VM;
544                 else
545                         reipl_method = REIPL_METHOD_CCW_CIO;
546                 break;
547         case IPL_TYPE_FCP:
548                 if (diag308_set_works)
549                         reipl_method = REIPL_METHOD_FCP_RW_DIAG;
550                 else if (MACHINE_IS_VM)
551                         reipl_method = REIPL_METHOD_FCP_RO_VM;
552                 else
553                         reipl_method = REIPL_METHOD_FCP_RO_DIAG;
554                 break;
555         case IPL_TYPE_FCP_DUMP:
556                 reipl_method = REIPL_METHOD_FCP_DUMP;
557                 break;
558         case IPL_TYPE_NSS:
559                 reipl_method = REIPL_METHOD_NSS;
560                 break;
561         case IPL_TYPE_UNKNOWN:
562                 reipl_method = REIPL_METHOD_DEFAULT;
563                 break;
564         default:
565                 BUG();
566         }
567         reipl_type = type;
568         return 0;
569 }
570
571 static ssize_t reipl_type_show(struct kset *kset, char *page)
572 {
573         return sprintf(page, "%s\n", ipl_type_str(reipl_type));
574 }
575
576 static ssize_t reipl_type_store(struct kset *kset, const char *buf,
577                                 size_t len)
578 {
579         int rc = -EINVAL;
580
581         if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
582                 rc = reipl_set_type(IPL_TYPE_CCW);
583         else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
584                 rc = reipl_set_type(IPL_TYPE_FCP);
585         else if (strncmp(buf, IPL_NSS_STR, strlen(IPL_NSS_STR)) == 0)
586                 rc = reipl_set_type(IPL_TYPE_NSS);
587         return (rc != 0) ? rc : len;
588 }
589
590 static struct subsys_attribute reipl_type_attr =
591                 __ATTR(reipl_type, 0644, reipl_type_show, reipl_type_store);
592
593 static decl_subsys(reipl, NULL, NULL);
594
595 /*
596  * dump section
597  */
598
599 /* FCP dump device attributes */
600
601 DEFINE_IPL_ATTR_RW(dump_fcp, wwpn, "0x%016llx\n", "%016llx\n",
602                    dump_block_fcp->ipl_info.fcp.wwpn);
603 DEFINE_IPL_ATTR_RW(dump_fcp, lun, "0x%016llx\n", "%016llx\n",
604                    dump_block_fcp->ipl_info.fcp.lun);
605 DEFINE_IPL_ATTR_RW(dump_fcp, bootprog, "%lld\n", "%lld\n",
606                    dump_block_fcp->ipl_info.fcp.bootprog);
607 DEFINE_IPL_ATTR_RW(dump_fcp, br_lba, "%lld\n", "%lld\n",
608                    dump_block_fcp->ipl_info.fcp.br_lba);
609 DEFINE_IPL_ATTR_RW(dump_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
610                    dump_block_fcp->ipl_info.fcp.devno);
611
612 static struct attribute *dump_fcp_attrs[] = {
613         &sys_dump_fcp_device_attr.attr,
614         &sys_dump_fcp_wwpn_attr.attr,
615         &sys_dump_fcp_lun_attr.attr,
616         &sys_dump_fcp_bootprog_attr.attr,
617         &sys_dump_fcp_br_lba_attr.attr,
618         NULL,
619 };
620
621 static struct attribute_group dump_fcp_attr_group = {
622         .name  = IPL_FCP_STR,
623         .attrs = dump_fcp_attrs,
624 };
625
626 /* CCW dump device attributes */
627
628 DEFINE_IPL_ATTR_RW(dump_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
629                    dump_block_ccw->ipl_info.ccw.devno);
630
631 static struct attribute *dump_ccw_attrs[] = {
632         &sys_dump_ccw_device_attr.attr,
633         NULL,
634 };
635
636 static struct attribute_group dump_ccw_attr_group = {
637         .name  = IPL_CCW_STR,
638         .attrs = dump_ccw_attrs,
639 };
640
641 /* dump type */
642
643 static int dump_set_type(enum dump_type type)
644 {
645         if (!(dump_capabilities & type))
646                 return -EINVAL;
647         switch(type) {
648         case DUMP_TYPE_CCW:
649                 if (MACHINE_IS_VM)
650                         dump_method = DUMP_METHOD_CCW_VM;
651                 else
652                         dump_method = DUMP_METHOD_CCW_CIO;
653                 break;
654         case DUMP_TYPE_FCP:
655                 dump_method = DUMP_METHOD_FCP_DIAG;
656                 break;
657         default:
658                 dump_method = DUMP_METHOD_NONE;
659         }
660         dump_type = type;
661         return 0;
662 }
663
664 static ssize_t dump_type_show(struct kset *kset, char *page)
665 {
666         return sprintf(page, "%s\n", dump_type_str(dump_type));
667 }
668
669 static ssize_t dump_type_store(struct kset *kset, const char *buf,
670                                size_t len)
671 {
672         int rc = -EINVAL;
673
674         if (strncmp(buf, DUMP_NONE_STR, strlen(DUMP_NONE_STR)) == 0)
675                 rc = dump_set_type(DUMP_TYPE_NONE);
676         else if (strncmp(buf, DUMP_CCW_STR, strlen(DUMP_CCW_STR)) == 0)
677                 rc = dump_set_type(DUMP_TYPE_CCW);
678         else if (strncmp(buf, DUMP_FCP_STR, strlen(DUMP_FCP_STR)) == 0)
679                 rc = dump_set_type(DUMP_TYPE_FCP);
680         return (rc != 0) ? rc : len;
681 }
682
683 static struct subsys_attribute dump_type_attr =
684                 __ATTR(dump_type, 0644, dump_type_show, dump_type_store);
685
686 static decl_subsys(dump, NULL, NULL);
687
688 /*
689  * Shutdown actions section
690  */
691
692 static decl_subsys(shutdown_actions, NULL, NULL);
693
694 /* on panic */
695
696 static ssize_t on_panic_show(struct kset *kset, char *page)
697 {
698         return sprintf(page, "%s\n", shutdown_action_str(on_panic_action));
699 }
700
701 static ssize_t on_panic_store(struct kset *kset, const char *buf,
702                               size_t len)
703 {
704         if (strncmp(buf, SHUTDOWN_REIPL_STR, strlen(SHUTDOWN_REIPL_STR)) == 0)
705                 on_panic_action = SHUTDOWN_REIPL;
706         else if (strncmp(buf, SHUTDOWN_DUMP_STR,
707                          strlen(SHUTDOWN_DUMP_STR)) == 0)
708                 on_panic_action = SHUTDOWN_DUMP;
709         else if (strncmp(buf, SHUTDOWN_STOP_STR,
710                          strlen(SHUTDOWN_STOP_STR)) == 0)
711                 on_panic_action = SHUTDOWN_STOP;
712         else
713                 return -EINVAL;
714
715         return len;
716 }
717
718 static struct subsys_attribute on_panic_attr =
719                 __ATTR(on_panic, 0644, on_panic_show, on_panic_store);
720
721 void do_reipl(void)
722 {
723         struct ccw_dev_id devid;
724         static char buf[100];
725         char loadparm[LOADPARM_LEN + 1];
726
727         switch (reipl_method) {
728         case REIPL_METHOD_CCW_CIO:
729                 devid.devno = reipl_block_ccw->ipl_info.ccw.devno;
730                 if (ipl_info.type == IPL_TYPE_CCW && devid.devno == ipl_devno)
731                         diag308(DIAG308_IPL, NULL);
732                 devid.ssid  = 0;
733                 reipl_ccw_dev(&devid);
734                 break;
735         case REIPL_METHOD_CCW_VM:
736                 reipl_get_ascii_loadparm(loadparm);
737                 if (strlen(loadparm) == 0)
738                         sprintf(buf, "IPL %X",
739                                 reipl_block_ccw->ipl_info.ccw.devno);
740                 else
741                         sprintf(buf, "IPL %X LOADPARM '%s'",
742                                 reipl_block_ccw->ipl_info.ccw.devno, loadparm);
743                 __cpcmd(buf, NULL, 0, NULL);
744                 break;
745         case REIPL_METHOD_CCW_DIAG:
746                 diag308(DIAG308_SET, reipl_block_ccw);
747                 diag308(DIAG308_IPL, NULL);
748                 break;
749         case REIPL_METHOD_FCP_RW_DIAG:
750                 diag308(DIAG308_SET, reipl_block_fcp);
751                 diag308(DIAG308_IPL, NULL);
752                 break;
753         case REIPL_METHOD_FCP_RO_DIAG:
754                 diag308(DIAG308_IPL, NULL);
755                 break;
756         case REIPL_METHOD_FCP_RO_VM:
757                 __cpcmd("IPL", NULL, 0, NULL);
758                 break;
759         case REIPL_METHOD_NSS:
760                 sprintf(buf, "IPL %s", reipl_nss_name);
761                 __cpcmd(buf, NULL, 0, NULL);
762                 break;
763         case REIPL_METHOD_DEFAULT:
764                 if (MACHINE_IS_VM)
765                         __cpcmd("IPL", NULL, 0, NULL);
766                 diag308(DIAG308_IPL, NULL);
767                 break;
768         case REIPL_METHOD_FCP_DUMP:
769         default:
770                 break;
771         }
772         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
773 }
774
775 static void do_dump(void)
776 {
777         struct ccw_dev_id devid;
778         static char buf[100];
779
780         switch (dump_method) {
781         case DUMP_METHOD_CCW_CIO:
782                 smp_send_stop();
783                 devid.devno = dump_block_ccw->ipl_info.ccw.devno;
784                 devid.ssid  = 0;
785                 reipl_ccw_dev(&devid);
786                 break;
787         case DUMP_METHOD_CCW_VM:
788                 smp_send_stop();
789                 sprintf(buf, "STORE STATUS");
790                 __cpcmd(buf, NULL, 0, NULL);
791                 sprintf(buf, "IPL %X", dump_block_ccw->ipl_info.ccw.devno);
792                 __cpcmd(buf, NULL, 0, NULL);
793                 break;
794         case DUMP_METHOD_CCW_DIAG:
795                 diag308(DIAG308_SET, dump_block_ccw);
796                 diag308(DIAG308_DUMP, NULL);
797                 break;
798         case DUMP_METHOD_FCP_DIAG:
799                 diag308(DIAG308_SET, dump_block_fcp);
800                 diag308(DIAG308_DUMP, NULL);
801                 break;
802         case DUMP_METHOD_NONE:
803         default:
804                 return;
805         }
806         printk(KERN_EMERG "Dump failed!\n");
807 }
808
809 /* init functions */
810
811 static int __init ipl_register_fcp_files(void)
812 {
813         int rc;
814
815         rc = sysfs_create_group(&ipl_subsys.kobj,
816                                 &ipl_fcp_attr_group);
817         if (rc)
818                 goto out;
819         rc = sysfs_create_bin_file(&ipl_subsys.kobj,
820                                    &ipl_parameter_attr);
821         if (rc)
822                 goto out_ipl_parm;
823         rc = sysfs_create_bin_file(&ipl_subsys.kobj,
824                                    &ipl_scp_data_attr);
825         if (!rc)
826                 goto out;
827
828         sysfs_remove_bin_file(&ipl_subsys.kobj, &ipl_parameter_attr);
829
830 out_ipl_parm:
831         sysfs_remove_group(&ipl_subsys.kobj, &ipl_fcp_attr_group);
832 out:
833         return rc;
834 }
835
836 static int __init ipl_init(void)
837 {
838         int rc;
839
840         rc = firmware_register(&ipl_subsys);
841         if (rc)
842                 return rc;
843         switch (ipl_info.type) {
844         case IPL_TYPE_CCW:
845                 rc = sysfs_create_group(&ipl_subsys.kobj,
846                                         &ipl_ccw_attr_group);
847                 break;
848         case IPL_TYPE_FCP:
849         case IPL_TYPE_FCP_DUMP:
850                 rc = ipl_register_fcp_files();
851                 break;
852         case IPL_TYPE_NSS:
853                 rc = sysfs_create_group(&ipl_subsys.kobj,
854                                         &ipl_nss_attr_group);
855                 break;
856         default:
857                 rc = sysfs_create_group(&ipl_subsys.kobj,
858                                         &ipl_unknown_attr_group);
859                 break;
860         }
861         if (rc)
862                 firmware_unregister(&ipl_subsys);
863         return rc;
864 }
865
866 static void __init reipl_probe(void)
867 {
868         void *buffer;
869
870         buffer = (void *) get_zeroed_page(GFP_KERNEL);
871         if (!buffer)
872                 return;
873         if (diag308(DIAG308_STORE, buffer) == DIAG308_RC_OK)
874                 diag308_set_works = 1;
875         free_page((unsigned long)buffer);
876 }
877
878 static int __init reipl_nss_init(void)
879 {
880         int rc;
881
882         if (!MACHINE_IS_VM)
883                 return 0;
884         rc = sysfs_create_group(&reipl_subsys.kobj, &reipl_nss_attr_group);
885         if (rc)
886                 return rc;
887         strncpy(reipl_nss_name, kernel_nss_name, NSS_NAME_SIZE + 1);
888         reipl_capabilities |= IPL_TYPE_NSS;
889         return 0;
890 }
891
892 static int __init reipl_ccw_init(void)
893 {
894         int rc;
895
896         reipl_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
897         if (!reipl_block_ccw)
898                 return -ENOMEM;
899         rc = sysfs_create_group(&reipl_subsys.kobj, &reipl_ccw_attr_group);
900         if (rc) {
901                 free_page((unsigned long)reipl_block_ccw);
902                 return rc;
903         }
904         reipl_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
905         reipl_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
906         reipl_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
907         reipl_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
908         /* check if read scp info worked and set loadparm */
909         if (sclp_ipl_info.is_valid)
910                 memcpy(reipl_block_ccw->ipl_info.ccw.load_param,
911                        &sclp_ipl_info.loadparm, LOADPARM_LEN);
912         else
913                 /* read scp info failed: set empty loadparm (EBCDIC blanks) */
914                 memset(reipl_block_ccw->ipl_info.ccw.load_param, 0x40,
915                        LOADPARM_LEN);
916         /* FIXME: check for diag308_set_works when enabling diag ccw reipl */
917         if (!MACHINE_IS_VM)
918                 sys_reipl_ccw_loadparm_attr.attr.mode = S_IRUGO;
919         if (ipl_info.type == IPL_TYPE_CCW)
920                 reipl_block_ccw->ipl_info.ccw.devno = ipl_devno;
921         reipl_capabilities |= IPL_TYPE_CCW;
922         return 0;
923 }
924
925 static int __init reipl_fcp_init(void)
926 {
927         int rc;
928
929         if ((!diag308_set_works) && (ipl_info.type != IPL_TYPE_FCP))
930                 return 0;
931         if ((!diag308_set_works) && (ipl_info.type == IPL_TYPE_FCP))
932                 make_attrs_ro(reipl_fcp_attrs);
933
934         reipl_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
935         if (!reipl_block_fcp)
936                 return -ENOMEM;
937         rc = sysfs_create_group(&reipl_subsys.kobj, &reipl_fcp_attr_group);
938         if (rc) {
939                 free_page((unsigned long)reipl_block_fcp);
940                 return rc;
941         }
942         if (ipl_info.type == IPL_TYPE_FCP) {
943                 memcpy(reipl_block_fcp, IPL_PARMBLOCK_START, PAGE_SIZE);
944         } else {
945                 reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
946                 reipl_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
947                 reipl_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
948                 reipl_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
949                 reipl_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_IPL;
950         }
951         reipl_capabilities |= IPL_TYPE_FCP;
952         return 0;
953 }
954
955 static int __init reipl_init(void)
956 {
957         int rc;
958
959         rc = firmware_register(&reipl_subsys);
960         if (rc)
961                 return rc;
962         rc = subsys_create_file(&reipl_subsys, &reipl_type_attr);
963         if (rc) {
964                 firmware_unregister(&reipl_subsys);
965                 return rc;
966         }
967         rc = reipl_ccw_init();
968         if (rc)
969                 return rc;
970         rc = reipl_fcp_init();
971         if (rc)
972                 return rc;
973         rc = reipl_nss_init();
974         if (rc)
975                 return rc;
976         rc = reipl_set_type(ipl_info.type);
977         if (rc)
978                 return rc;
979         return 0;
980 }
981
982 static int __init dump_ccw_init(void)
983 {
984         int rc;
985
986         dump_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
987         if (!dump_block_ccw)
988                 return -ENOMEM;
989         rc = sysfs_create_group(&dump_subsys.kobj, &dump_ccw_attr_group);
990         if (rc) {
991                 free_page((unsigned long)dump_block_ccw);
992                 return rc;
993         }
994         dump_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
995         dump_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
996         dump_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
997         dump_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
998         dump_capabilities |= DUMP_TYPE_CCW;
999         return 0;
1000 }
1001
1002 static int __init dump_fcp_init(void)
1003 {
1004         int rc;
1005
1006         if (!sclp_ipl_info.has_dump)
1007                 return 0; /* LDIPL DUMP is not installed */
1008         if (!diag308_set_works)
1009                 return 0;
1010         dump_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
1011         if (!dump_block_fcp)
1012                 return -ENOMEM;
1013         rc = sysfs_create_group(&dump_subsys.kobj, &dump_fcp_attr_group);
1014         if (rc) {
1015                 free_page((unsigned long)dump_block_fcp);
1016                 return rc;
1017         }
1018         dump_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
1019         dump_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
1020         dump_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
1021         dump_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
1022         dump_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_DUMP;
1023         dump_capabilities |= DUMP_TYPE_FCP;
1024         return 0;
1025 }
1026
1027 #define SHUTDOWN_ON_PANIC_PRIO 0
1028
1029 static int shutdown_on_panic_notify(struct notifier_block *self,
1030                                     unsigned long event, void *data)
1031 {
1032         if (on_panic_action == SHUTDOWN_DUMP)
1033                 do_dump();
1034         else if (on_panic_action == SHUTDOWN_REIPL)
1035                 do_reipl();
1036         return NOTIFY_OK;
1037 }
1038
1039 static struct notifier_block shutdown_on_panic_nb = {
1040         .notifier_call = shutdown_on_panic_notify,
1041         .priority = SHUTDOWN_ON_PANIC_PRIO
1042 };
1043
1044 static int __init dump_init(void)
1045 {
1046         int rc;
1047
1048         rc = firmware_register(&dump_subsys);
1049         if (rc)
1050                 return rc;
1051         rc = subsys_create_file(&dump_subsys, &dump_type_attr);
1052         if (rc) {
1053                 firmware_unregister(&dump_subsys);
1054                 return rc;
1055         }
1056         rc = dump_ccw_init();
1057         if (rc)
1058                 return rc;
1059         rc = dump_fcp_init();
1060         if (rc)
1061                 return rc;
1062         dump_set_type(DUMP_TYPE_NONE);
1063         return 0;
1064 }
1065
1066 static int __init shutdown_actions_init(void)
1067 {
1068         int rc;
1069
1070         rc = firmware_register(&shutdown_actions_subsys);
1071         if (rc)
1072                 return rc;
1073         rc = subsys_create_file(&shutdown_actions_subsys, &on_panic_attr);
1074         if (rc) {
1075                 firmware_unregister(&shutdown_actions_subsys);
1076                 return rc;
1077         }
1078         atomic_notifier_chain_register(&panic_notifier_list,
1079                                        &shutdown_on_panic_nb);
1080         return 0;
1081 }
1082
1083 static int __init s390_ipl_init(void)
1084 {
1085         int rc;
1086
1087         sclp_get_ipl_info(&sclp_ipl_info);
1088         reipl_probe();
1089         rc = ipl_init();
1090         if (rc)
1091                 return rc;
1092         rc = reipl_init();
1093         if (rc)
1094                 return rc;
1095         rc = dump_init();
1096         if (rc)
1097                 return rc;
1098         rc = shutdown_actions_init();
1099         if (rc)
1100                 return rc;
1101         return 0;
1102 }
1103
1104 __initcall(s390_ipl_init);
1105
1106 void __init ipl_save_parameters(void)
1107 {
1108         struct cio_iplinfo iplinfo;
1109         unsigned int *ipl_ptr;
1110         void *src, *dst;
1111
1112         if (cio_get_iplinfo(&iplinfo))
1113                 return;
1114
1115         ipl_devno = iplinfo.devno;
1116         ipl_flags |= IPL_DEVNO_VALID;
1117         if (!iplinfo.is_qdio)
1118                 return;
1119         ipl_flags |= IPL_PARMBLOCK_VALID;
1120         ipl_ptr = (unsigned int *)__LC_IPL_PARMBLOCK_PTR;
1121         src = (void *)(unsigned long)*ipl_ptr;
1122         dst = (void *)IPL_PARMBLOCK_ORIGIN;
1123         memmove(dst, src, PAGE_SIZE);
1124         *ipl_ptr = IPL_PARMBLOCK_ORIGIN;
1125 }
1126
1127 static LIST_HEAD(rcall);
1128 static DEFINE_MUTEX(rcall_mutex);
1129
1130 void register_reset_call(struct reset_call *reset)
1131 {
1132         mutex_lock(&rcall_mutex);
1133         list_add(&reset->list, &rcall);
1134         mutex_unlock(&rcall_mutex);
1135 }
1136 EXPORT_SYMBOL_GPL(register_reset_call);
1137
1138 void unregister_reset_call(struct reset_call *reset)
1139 {
1140         mutex_lock(&rcall_mutex);
1141         list_del(&reset->list);
1142         mutex_unlock(&rcall_mutex);
1143 }
1144 EXPORT_SYMBOL_GPL(unregister_reset_call);
1145
1146 static void do_reset_calls(void)
1147 {
1148         struct reset_call *reset;
1149
1150         list_for_each_entry(reset, &rcall, list)
1151                 reset->fn();
1152 }
1153
1154 u32 dump_prefix_page;
1155
1156 void s390_reset_system(void)
1157 {
1158         struct _lowcore *lc;
1159
1160         lc = (struct _lowcore *)(unsigned long) store_prefix();
1161
1162         /* Stack for interrupt/machine check handler */
1163         lc->panic_stack = S390_lowcore.panic_stack;
1164
1165         /* Save prefix page address for dump case */
1166         dump_prefix_page = (u32)(unsigned long) lc;
1167
1168         /* Disable prefixing */
1169         set_prefix(0);
1170
1171         /* Disable lowcore protection */
1172         __ctl_clear_bit(0,28);
1173
1174         /* Set new machine check handler */
1175         S390_lowcore.mcck_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
1176         S390_lowcore.mcck_new_psw.addr =
1177                 PSW_ADDR_AMODE | (unsigned long) s390_base_mcck_handler;
1178
1179         /* Set new program check handler */
1180         S390_lowcore.program_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
1181         S390_lowcore.program_new_psw.addr =
1182                 PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
1183
1184         do_reset_calls();
1185 }