e545ffe5155ab0179327cfe4f9f66e677c604041
[sfrench/cifs-2.6.git] / arch / s390 / kernel / ipl.c
1 /*
2  *    ipl/reipl/dump support for Linux on s390.
3  *
4  *    Copyright IBM Corp. 2005, 2012
5  *    Author(s): Michael Holzheu <holzheu@de.ibm.com>
6  *               Heiko Carstens <heiko.carstens@de.ibm.com>
7  *               Volker Sameske <sameske@de.ibm.com>
8  */
9
10 #include <linux/types.h>
11 #include <linux/export.h>
12 #include <linux/init.h>
13 #include <linux/device.h>
14 #include <linux/delay.h>
15 #include <linux/reboot.h>
16 #include <linux/ctype.h>
17 #include <linux/fs.h>
18 #include <linux/gfp.h>
19 #include <linux/crash_dump.h>
20 #include <linux/debug_locks.h>
21 #include <asm/diag.h>
22 #include <asm/ipl.h>
23 #include <asm/smp.h>
24 #include <asm/setup.h>
25 #include <asm/cpcmd.h>
26 #include <asm/cio.h>
27 #include <asm/ebcdic.h>
28 #include <asm/reset.h>
29 #include <asm/sclp.h>
30 #include <asm/checksum.h>
31 #include <asm/debug.h>
32 #include <asm/os_info.h>
33 #include "entry.h"
34
35 #define IPL_PARM_BLOCK_VERSION 0
36
37 #define IPL_UNKNOWN_STR         "unknown"
38 #define IPL_CCW_STR             "ccw"
39 #define IPL_FCP_STR             "fcp"
40 #define IPL_FCP_DUMP_STR        "fcp_dump"
41 #define IPL_NSS_STR             "nss"
42
43 #define DUMP_CCW_STR            "ccw"
44 #define DUMP_FCP_STR            "fcp"
45 #define DUMP_NONE_STR           "none"
46
47 /*
48  * Four shutdown trigger types are supported:
49  * - panic
50  * - halt
51  * - power off
52  * - reipl
53  * - restart
54  */
55 #define ON_PANIC_STR            "on_panic"
56 #define ON_HALT_STR             "on_halt"
57 #define ON_POFF_STR             "on_poff"
58 #define ON_REIPL_STR            "on_reboot"
59 #define ON_RESTART_STR          "on_restart"
60
61 struct shutdown_action;
62 struct shutdown_trigger {
63         char *name;
64         struct shutdown_action *action;
65 };
66
67 /*
68  * The following shutdown action types are supported:
69  */
70 #define SHUTDOWN_ACTION_IPL_STR         "ipl"
71 #define SHUTDOWN_ACTION_REIPL_STR       "reipl"
72 #define SHUTDOWN_ACTION_DUMP_STR        "dump"
73 #define SHUTDOWN_ACTION_VMCMD_STR       "vmcmd"
74 #define SHUTDOWN_ACTION_STOP_STR        "stop"
75 #define SHUTDOWN_ACTION_DUMP_REIPL_STR  "dump_reipl"
76
77 struct shutdown_action {
78         char *name;
79         void (*fn) (struct shutdown_trigger *trigger);
80         int (*init) (void);
81         int init_rc;
82 };
83
84 static char *ipl_type_str(enum ipl_type type)
85 {
86         switch (type) {
87         case IPL_TYPE_CCW:
88                 return IPL_CCW_STR;
89         case IPL_TYPE_FCP:
90                 return IPL_FCP_STR;
91         case IPL_TYPE_FCP_DUMP:
92                 return IPL_FCP_DUMP_STR;
93         case IPL_TYPE_NSS:
94                 return IPL_NSS_STR;
95         case IPL_TYPE_UNKNOWN:
96         default:
97                 return IPL_UNKNOWN_STR;
98         }
99 }
100
101 enum dump_type {
102         DUMP_TYPE_NONE  = 1,
103         DUMP_TYPE_CCW   = 2,
104         DUMP_TYPE_FCP   = 4,
105 };
106
107 static char *dump_type_str(enum dump_type type)
108 {
109         switch (type) {
110         case DUMP_TYPE_NONE:
111                 return DUMP_NONE_STR;
112         case DUMP_TYPE_CCW:
113                 return DUMP_CCW_STR;
114         case DUMP_TYPE_FCP:
115                 return DUMP_FCP_STR;
116         default:
117                 return NULL;
118         }
119 }
120
121 /*
122  * Must be in data section since the bss section
123  * is not cleared when these are accessed.
124  */
125 static u8 ipl_ssid __section(.data) = 0;
126 static u16 ipl_devno __section(.data) = 0;
127 u32 ipl_flags __section(.data) = 0;
128
129 enum ipl_method {
130         REIPL_METHOD_CCW_CIO,
131         REIPL_METHOD_CCW_DIAG,
132         REIPL_METHOD_CCW_VM,
133         REIPL_METHOD_FCP_RO_DIAG,
134         REIPL_METHOD_FCP_RW_DIAG,
135         REIPL_METHOD_FCP_RO_VM,
136         REIPL_METHOD_FCP_DUMP,
137         REIPL_METHOD_NSS,
138         REIPL_METHOD_NSS_DIAG,
139         REIPL_METHOD_DEFAULT,
140 };
141
142 enum dump_method {
143         DUMP_METHOD_NONE,
144         DUMP_METHOD_CCW_CIO,
145         DUMP_METHOD_CCW_DIAG,
146         DUMP_METHOD_CCW_VM,
147         DUMP_METHOD_FCP_DIAG,
148 };
149
150 static int diag308_set_works = 0;
151
152 static struct ipl_parameter_block ipl_block;
153
154 static int reipl_capabilities = IPL_TYPE_UNKNOWN;
155
156 static enum ipl_type reipl_type = IPL_TYPE_UNKNOWN;
157 static enum ipl_method reipl_method = REIPL_METHOD_DEFAULT;
158 static struct ipl_parameter_block *reipl_block_fcp;
159 static struct ipl_parameter_block *reipl_block_ccw;
160 static struct ipl_parameter_block *reipl_block_nss;
161 static struct ipl_parameter_block *reipl_block_actual;
162
163 static int dump_capabilities = DUMP_TYPE_NONE;
164 static enum dump_type dump_type = DUMP_TYPE_NONE;
165 static enum dump_method dump_method = DUMP_METHOD_NONE;
166 static struct ipl_parameter_block *dump_block_fcp;
167 static struct ipl_parameter_block *dump_block_ccw;
168
169 static struct sclp_ipl_info sclp_ipl_info;
170
171 static inline int __diag308(unsigned long subcode, void *addr)
172 {
173         register unsigned long _addr asm("0") = (unsigned long) addr;
174         register unsigned long _rc asm("1") = 0;
175
176         asm volatile(
177                 "       diag    %0,%2,0x308\n"
178                 "0:     nopr    %%r7\n"
179                 EX_TABLE(0b,0b)
180                 : "+d" (_addr), "+d" (_rc)
181                 : "d" (subcode) : "cc", "memory");
182         return _rc;
183 }
184
185 int diag308(unsigned long subcode, void *addr)
186 {
187         diag_stat_inc(DIAG_STAT_X308);
188         return __diag308(subcode, addr);
189 }
190 EXPORT_SYMBOL_GPL(diag308);
191
192 /* SYSFS */
193
194 #define IPL_ATTR_SHOW_FN(_prefix, _name, _format, args...)              \
195 static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj,     \
196                 struct kobj_attribute *attr,                            \
197                 char *page)                                             \
198 {                                                                       \
199         return snprintf(page, PAGE_SIZE, _format, ##args);              \
200 }
201
202 #define IPL_ATTR_CCW_STORE_FN(_prefix, _name, _ipl_blk)                 \
203 static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,    \
204                 struct kobj_attribute *attr,                            \
205                 const char *buf, size_t len)                            \
206 {                                                                       \
207         unsigned long long ssid, devno;                                 \
208                                                                         \
209         if (sscanf(buf, "0.%llx.%llx\n", &ssid, &devno) != 2)           \
210                 return -EINVAL;                                         \
211                                                                         \
212         if (ssid > __MAX_SSID || devno > __MAX_SUBCHANNEL)              \
213                 return -EINVAL;                                         \
214                                                                         \
215         _ipl_blk.ssid = ssid;                                           \
216         _ipl_blk.devno = devno;                                         \
217         return len;                                                     \
218 }
219
220 #define DEFINE_IPL_CCW_ATTR_RW(_prefix, _name, _ipl_blk)                \
221 IPL_ATTR_SHOW_FN(_prefix, _name, "0.%x.%04x\n",                         \
222                  _ipl_blk.ssid, _ipl_blk.devno);                        \
223 IPL_ATTR_CCW_STORE_FN(_prefix, _name, _ipl_blk);                        \
224 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
225         __ATTR(_name, (S_IRUGO | S_IWUSR),                              \
226                sys_##_prefix##_##_name##_show,                          \
227                sys_##_prefix##_##_name##_store)                         \
228
229 #define DEFINE_IPL_ATTR_RO(_prefix, _name, _format, _value)             \
230 IPL_ATTR_SHOW_FN(_prefix, _name, _format, _value)                       \
231 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
232         __ATTR(_name, S_IRUGO, sys_##_prefix##_##_name##_show, NULL)
233
234 #define DEFINE_IPL_ATTR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)   \
235 IPL_ATTR_SHOW_FN(_prefix, _name, _fmt_out, (unsigned long long) _value) \
236 static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,    \
237                 struct kobj_attribute *attr,                            \
238                 const char *buf, size_t len)                            \
239 {                                                                       \
240         unsigned long long value;                                       \
241         if (sscanf(buf, _fmt_in, &value) != 1)                          \
242                 return -EINVAL;                                         \
243         _value = value;                                                 \
244         return len;                                                     \
245 }                                                                       \
246 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
247         __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
248                         sys_##_prefix##_##_name##_show,                 \
249                         sys_##_prefix##_##_name##_store)
250
251 #define DEFINE_IPL_ATTR_STR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)\
252 IPL_ATTR_SHOW_FN(_prefix, _name, _fmt_out, _value)                      \
253 static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,    \
254                 struct kobj_attribute *attr,                            \
255                 const char *buf, size_t len)                            \
256 {                                                                       \
257         strncpy(_value, buf, sizeof(_value) - 1);                       \
258         strim(_value);                                                  \
259         return len;                                                     \
260 }                                                                       \
261 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
262         __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
263                         sys_##_prefix##_##_name##_show,                 \
264                         sys_##_prefix##_##_name##_store)
265
266 static void make_attrs_ro(struct attribute **attrs)
267 {
268         while (*attrs) {
269                 (*attrs)->mode = S_IRUGO;
270                 attrs++;
271         }
272 }
273
274 /*
275  * ipl section
276  */
277
278 static __init enum ipl_type get_ipl_type(void)
279 {
280         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
281
282         if (ipl_flags & IPL_NSS_VALID)
283                 return IPL_TYPE_NSS;
284         if (!(ipl_flags & IPL_DEVNO_VALID))
285                 return IPL_TYPE_UNKNOWN;
286         if (!(ipl_flags & IPL_PARMBLOCK_VALID))
287                 return IPL_TYPE_CCW;
288         if (ipl->hdr.version > IPL_MAX_SUPPORTED_VERSION)
289                 return IPL_TYPE_UNKNOWN;
290         if (ipl->hdr.pbt != DIAG308_IPL_TYPE_FCP)
291                 return IPL_TYPE_UNKNOWN;
292         if (ipl->ipl_info.fcp.opt == DIAG308_IPL_OPT_DUMP)
293                 return IPL_TYPE_FCP_DUMP;
294         return IPL_TYPE_FCP;
295 }
296
297 struct ipl_info ipl_info;
298 EXPORT_SYMBOL_GPL(ipl_info);
299
300 static ssize_t ipl_type_show(struct kobject *kobj, struct kobj_attribute *attr,
301                              char *page)
302 {
303         return sprintf(page, "%s\n", ipl_type_str(ipl_info.type));
304 }
305
306 static struct kobj_attribute sys_ipl_type_attr = __ATTR_RO(ipl_type);
307
308 /* VM IPL PARM routines */
309 static size_t reipl_get_ascii_vmparm(char *dest, size_t size,
310                                      const struct ipl_parameter_block *ipb)
311 {
312         int i;
313         size_t len;
314         char has_lowercase = 0;
315
316         len = 0;
317         if ((ipb->ipl_info.ccw.vm_flags & DIAG308_VM_FLAGS_VP_VALID) &&
318             (ipb->ipl_info.ccw.vm_parm_len > 0)) {
319
320                 len = min_t(size_t, size - 1, ipb->ipl_info.ccw.vm_parm_len);
321                 memcpy(dest, ipb->ipl_info.ccw.vm_parm, len);
322                 /* If at least one character is lowercase, we assume mixed
323                  * case; otherwise we convert everything to lowercase.
324                  */
325                 for (i = 0; i < len; i++)
326                         if ((dest[i] > 0x80 && dest[i] < 0x8a) || /* a-i */
327                             (dest[i] > 0x90 && dest[i] < 0x9a) || /* j-r */
328                             (dest[i] > 0xa1 && dest[i] < 0xaa)) { /* s-z */
329                                 has_lowercase = 1;
330                                 break;
331                         }
332                 if (!has_lowercase)
333                         EBC_TOLOWER(dest, len);
334                 EBCASC(dest, len);
335         }
336         dest[len] = 0;
337
338         return len;
339 }
340
341 size_t append_ipl_vmparm(char *dest, size_t size)
342 {
343         size_t rc;
344
345         rc = 0;
346         if (diag308_set_works && (ipl_block.hdr.pbt == DIAG308_IPL_TYPE_CCW))
347                 rc = reipl_get_ascii_vmparm(dest, size, &ipl_block);
348         else
349                 dest[0] = 0;
350         return rc;
351 }
352
353 static ssize_t ipl_vm_parm_show(struct kobject *kobj,
354                                 struct kobj_attribute *attr, char *page)
355 {
356         char parm[DIAG308_VMPARM_SIZE + 1] = {};
357
358         append_ipl_vmparm(parm, sizeof(parm));
359         return sprintf(page, "%s\n", parm);
360 }
361
362 static size_t scpdata_length(const char* buf, size_t count)
363 {
364         while (count) {
365                 if (buf[count - 1] != '\0' && buf[count - 1] != ' ')
366                         break;
367                 count--;
368         }
369         return count;
370 }
371
372 static size_t reipl_append_ascii_scpdata(char *dest, size_t size,
373                                          const struct ipl_parameter_block *ipb)
374 {
375         size_t count;
376         size_t i;
377         int has_lowercase;
378
379         count = min(size - 1, scpdata_length(ipb->ipl_info.fcp.scp_data,
380                                              ipb->ipl_info.fcp.scp_data_len));
381         if (!count)
382                 goto out;
383
384         has_lowercase = 0;
385         for (i = 0; i < count; i++) {
386                 if (!isascii(ipb->ipl_info.fcp.scp_data[i])) {
387                         count = 0;
388                         goto out;
389                 }
390                 if (!has_lowercase && islower(ipb->ipl_info.fcp.scp_data[i]))
391                         has_lowercase = 1;
392         }
393
394         if (has_lowercase)
395                 memcpy(dest, ipb->ipl_info.fcp.scp_data, count);
396         else
397                 for (i = 0; i < count; i++)
398                         dest[i] = tolower(ipb->ipl_info.fcp.scp_data[i]);
399 out:
400         dest[count] = '\0';
401         return count;
402 }
403
404 size_t append_ipl_scpdata(char *dest, size_t len)
405 {
406         size_t rc;
407
408         rc = 0;
409         if (ipl_block.hdr.pbt == DIAG308_IPL_TYPE_FCP)
410                 rc = reipl_append_ascii_scpdata(dest, len, &ipl_block);
411         else
412                 dest[0] = 0;
413         return rc;
414 }
415
416
417 static struct kobj_attribute sys_ipl_vm_parm_attr =
418         __ATTR(parm, S_IRUGO, ipl_vm_parm_show, NULL);
419
420 static ssize_t sys_ipl_device_show(struct kobject *kobj,
421                                    struct kobj_attribute *attr, char *page)
422 {
423         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
424
425         switch (ipl_info.type) {
426         case IPL_TYPE_CCW:
427                 return sprintf(page, "0.%x.%04x\n", ipl_ssid, ipl_devno);
428         case IPL_TYPE_FCP:
429         case IPL_TYPE_FCP_DUMP:
430                 return sprintf(page, "0.0.%04x\n", ipl->ipl_info.fcp.devno);
431         default:
432                 return 0;
433         }
434 }
435
436 static struct kobj_attribute sys_ipl_device_attr =
437         __ATTR(device, S_IRUGO, sys_ipl_device_show, NULL);
438
439 static ssize_t ipl_parameter_read(struct file *filp, struct kobject *kobj,
440                                   struct bin_attribute *attr, char *buf,
441                                   loff_t off, size_t count)
442 {
443         return memory_read_from_buffer(buf, count, &off, IPL_PARMBLOCK_START,
444                                         IPL_PARMBLOCK_SIZE);
445 }
446 static struct bin_attribute ipl_parameter_attr =
447         __BIN_ATTR(binary_parameter, S_IRUGO, ipl_parameter_read, NULL,
448                    PAGE_SIZE);
449
450 static ssize_t ipl_scp_data_read(struct file *filp, struct kobject *kobj,
451                                  struct bin_attribute *attr, char *buf,
452                                  loff_t off, size_t count)
453 {
454         unsigned int size = IPL_PARMBLOCK_START->ipl_info.fcp.scp_data_len;
455         void *scp_data = &IPL_PARMBLOCK_START->ipl_info.fcp.scp_data;
456
457         return memory_read_from_buffer(buf, count, &off, scp_data, size);
458 }
459 static struct bin_attribute ipl_scp_data_attr =
460         __BIN_ATTR(scp_data, S_IRUGO, ipl_scp_data_read, NULL, PAGE_SIZE);
461
462 static struct bin_attribute *ipl_fcp_bin_attrs[] = {
463         &ipl_parameter_attr,
464         &ipl_scp_data_attr,
465         NULL,
466 };
467
468 /* FCP ipl device attributes */
469
470 DEFINE_IPL_ATTR_RO(ipl_fcp, wwpn, "0x%016llx\n", (unsigned long long)
471                    IPL_PARMBLOCK_START->ipl_info.fcp.wwpn);
472 DEFINE_IPL_ATTR_RO(ipl_fcp, lun, "0x%016llx\n", (unsigned long long)
473                    IPL_PARMBLOCK_START->ipl_info.fcp.lun);
474 DEFINE_IPL_ATTR_RO(ipl_fcp, bootprog, "%lld\n", (unsigned long long)
475                    IPL_PARMBLOCK_START->ipl_info.fcp.bootprog);
476 DEFINE_IPL_ATTR_RO(ipl_fcp, br_lba, "%lld\n", (unsigned long long)
477                    IPL_PARMBLOCK_START->ipl_info.fcp.br_lba);
478
479 static ssize_t ipl_ccw_loadparm_show(struct kobject *kobj,
480                                      struct kobj_attribute *attr, char *page)
481 {
482         char loadparm[LOADPARM_LEN + 1] = {};
483
484         if (!sclp_ipl_info.is_valid)
485                 return sprintf(page, "#unknown#\n");
486         memcpy(loadparm, &sclp_ipl_info.loadparm, LOADPARM_LEN);
487         EBCASC(loadparm, LOADPARM_LEN);
488         strim(loadparm);
489         return sprintf(page, "%s\n", loadparm);
490 }
491
492 static struct kobj_attribute sys_ipl_ccw_loadparm_attr =
493         __ATTR(loadparm, 0444, ipl_ccw_loadparm_show, NULL);
494
495 static struct attribute *ipl_fcp_attrs[] = {
496         &sys_ipl_type_attr.attr,
497         &sys_ipl_device_attr.attr,
498         &sys_ipl_fcp_wwpn_attr.attr,
499         &sys_ipl_fcp_lun_attr.attr,
500         &sys_ipl_fcp_bootprog_attr.attr,
501         &sys_ipl_fcp_br_lba_attr.attr,
502         &sys_ipl_ccw_loadparm_attr.attr,
503         NULL,
504 };
505
506 static struct attribute_group ipl_fcp_attr_group = {
507         .attrs = ipl_fcp_attrs,
508         .bin_attrs = ipl_fcp_bin_attrs,
509 };
510
511 /* CCW ipl device attributes */
512
513 static struct attribute *ipl_ccw_attrs_vm[] = {
514         &sys_ipl_type_attr.attr,
515         &sys_ipl_device_attr.attr,
516         &sys_ipl_ccw_loadparm_attr.attr,
517         &sys_ipl_vm_parm_attr.attr,
518         NULL,
519 };
520
521 static struct attribute *ipl_ccw_attrs_lpar[] = {
522         &sys_ipl_type_attr.attr,
523         &sys_ipl_device_attr.attr,
524         &sys_ipl_ccw_loadparm_attr.attr,
525         NULL,
526 };
527
528 static struct attribute_group ipl_ccw_attr_group_vm = {
529         .attrs = ipl_ccw_attrs_vm,
530 };
531
532 static struct attribute_group ipl_ccw_attr_group_lpar = {
533         .attrs = ipl_ccw_attrs_lpar
534 };
535
536 /* NSS ipl device attributes */
537
538 DEFINE_IPL_ATTR_RO(ipl_nss, name, "%s\n", kernel_nss_name);
539
540 static struct attribute *ipl_nss_attrs[] = {
541         &sys_ipl_type_attr.attr,
542         &sys_ipl_nss_name_attr.attr,
543         &sys_ipl_ccw_loadparm_attr.attr,
544         &sys_ipl_vm_parm_attr.attr,
545         NULL,
546 };
547
548 static struct attribute_group ipl_nss_attr_group = {
549         .attrs = ipl_nss_attrs,
550 };
551
552 /* UNKNOWN ipl device attributes */
553
554 static struct attribute *ipl_unknown_attrs[] = {
555         &sys_ipl_type_attr.attr,
556         NULL,
557 };
558
559 static struct attribute_group ipl_unknown_attr_group = {
560         .attrs = ipl_unknown_attrs,
561 };
562
563 static struct kset *ipl_kset;
564
565 static void __ipl_run(void *unused)
566 {
567         if (MACHINE_IS_LPAR && ipl_info.type == IPL_TYPE_CCW)
568                 diag308(DIAG308_LOAD_NORMAL_DUMP, NULL);
569         diag308(DIAG308_LOAD_CLEAR, NULL);
570         if (MACHINE_IS_VM)
571                 __cpcmd("IPL", NULL, 0, NULL);
572         else if (ipl_info.type == IPL_TYPE_CCW)
573                 reipl_ccw_dev(&ipl_info.data.ccw.dev_id);
574 }
575
576 static void ipl_run(struct shutdown_trigger *trigger)
577 {
578         smp_call_ipl_cpu(__ipl_run, NULL);
579 }
580
581 static int __init ipl_init(void)
582 {
583         int rc;
584
585         ipl_kset = kset_create_and_add("ipl", NULL, firmware_kobj);
586         if (!ipl_kset) {
587                 rc = -ENOMEM;
588                 goto out;
589         }
590         switch (ipl_info.type) {
591         case IPL_TYPE_CCW:
592                 if (MACHINE_IS_VM)
593                         rc = sysfs_create_group(&ipl_kset->kobj,
594                                                 &ipl_ccw_attr_group_vm);
595                 else
596                         rc = sysfs_create_group(&ipl_kset->kobj,
597                                                 &ipl_ccw_attr_group_lpar);
598                 break;
599         case IPL_TYPE_FCP:
600         case IPL_TYPE_FCP_DUMP:
601                 rc = sysfs_create_group(&ipl_kset->kobj, &ipl_fcp_attr_group);
602                 break;
603         case IPL_TYPE_NSS:
604                 rc = sysfs_create_group(&ipl_kset->kobj, &ipl_nss_attr_group);
605                 break;
606         default:
607                 rc = sysfs_create_group(&ipl_kset->kobj,
608                                         &ipl_unknown_attr_group);
609                 break;
610         }
611 out:
612         if (rc)
613                 panic("ipl_init failed: rc = %i\n", rc);
614
615         return 0;
616 }
617
618 static struct shutdown_action __refdata ipl_action = {
619         .name   = SHUTDOWN_ACTION_IPL_STR,
620         .fn     = ipl_run,
621         .init   = ipl_init,
622 };
623
624 /*
625  * reipl shutdown action: Reboot Linux on shutdown.
626  */
627
628 /* VM IPL PARM attributes */
629 static ssize_t reipl_generic_vmparm_show(struct ipl_parameter_block *ipb,
630                                           char *page)
631 {
632         char vmparm[DIAG308_VMPARM_SIZE + 1] = {};
633
634         reipl_get_ascii_vmparm(vmparm, sizeof(vmparm), ipb);
635         return sprintf(page, "%s\n", vmparm);
636 }
637
638 static ssize_t reipl_generic_vmparm_store(struct ipl_parameter_block *ipb,
639                                           size_t vmparm_max,
640                                           const char *buf, size_t len)
641 {
642         int i, ip_len;
643
644         /* ignore trailing newline */
645         ip_len = len;
646         if ((len > 0) && (buf[len - 1] == '\n'))
647                 ip_len--;
648
649         if (ip_len > vmparm_max)
650                 return -EINVAL;
651
652         /* parm is used to store kernel options, check for common chars */
653         for (i = 0; i < ip_len; i++)
654                 if (!(isalnum(buf[i]) || isascii(buf[i]) || isprint(buf[i])))
655                         return -EINVAL;
656
657         memset(ipb->ipl_info.ccw.vm_parm, 0, DIAG308_VMPARM_SIZE);
658         ipb->ipl_info.ccw.vm_parm_len = ip_len;
659         if (ip_len > 0) {
660                 ipb->ipl_info.ccw.vm_flags |= DIAG308_VM_FLAGS_VP_VALID;
661                 memcpy(ipb->ipl_info.ccw.vm_parm, buf, ip_len);
662                 ASCEBC(ipb->ipl_info.ccw.vm_parm, ip_len);
663         } else {
664                 ipb->ipl_info.ccw.vm_flags &= ~DIAG308_VM_FLAGS_VP_VALID;
665         }
666
667         return len;
668 }
669
670 /* NSS wrapper */
671 static ssize_t reipl_nss_vmparm_show(struct kobject *kobj,
672                                      struct kobj_attribute *attr, char *page)
673 {
674         return reipl_generic_vmparm_show(reipl_block_nss, page);
675 }
676
677 static ssize_t reipl_nss_vmparm_store(struct kobject *kobj,
678                                       struct kobj_attribute *attr,
679                                       const char *buf, size_t len)
680 {
681         return reipl_generic_vmparm_store(reipl_block_nss, 56, buf, len);
682 }
683
684 /* CCW wrapper */
685 static ssize_t reipl_ccw_vmparm_show(struct kobject *kobj,
686                                      struct kobj_attribute *attr, char *page)
687 {
688         return reipl_generic_vmparm_show(reipl_block_ccw, page);
689 }
690
691 static ssize_t reipl_ccw_vmparm_store(struct kobject *kobj,
692                                       struct kobj_attribute *attr,
693                                       const char *buf, size_t len)
694 {
695         return reipl_generic_vmparm_store(reipl_block_ccw, 64, buf, len);
696 }
697
698 static struct kobj_attribute sys_reipl_nss_vmparm_attr =
699         __ATTR(parm, S_IRUGO | S_IWUSR, reipl_nss_vmparm_show,
700                                         reipl_nss_vmparm_store);
701 static struct kobj_attribute sys_reipl_ccw_vmparm_attr =
702         __ATTR(parm, S_IRUGO | S_IWUSR, reipl_ccw_vmparm_show,
703                                         reipl_ccw_vmparm_store);
704
705 /* FCP reipl device attributes */
706
707 static ssize_t reipl_fcp_scpdata_read(struct file *filp, struct kobject *kobj,
708                                       struct bin_attribute *attr,
709                                       char *buf, loff_t off, size_t count)
710 {
711         size_t size = reipl_block_fcp->ipl_info.fcp.scp_data_len;
712         void *scp_data = reipl_block_fcp->ipl_info.fcp.scp_data;
713
714         return memory_read_from_buffer(buf, count, &off, scp_data, size);
715 }
716
717 static ssize_t reipl_fcp_scpdata_write(struct file *filp, struct kobject *kobj,
718                                        struct bin_attribute *attr,
719                                        char *buf, loff_t off, size_t count)
720 {
721         size_t scpdata_len = count;
722         size_t padding;
723
724
725         if (off)
726                 return -EINVAL;
727
728         memcpy(reipl_block_fcp->ipl_info.fcp.scp_data, buf, count);
729         if (scpdata_len % 8) {
730                 padding = 8 - (scpdata_len % 8);
731                 memset(reipl_block_fcp->ipl_info.fcp.scp_data + scpdata_len,
732                        0, padding);
733                 scpdata_len += padding;
734         }
735
736         reipl_block_fcp->ipl_info.fcp.scp_data_len = scpdata_len;
737         reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN + scpdata_len;
738         reipl_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN + scpdata_len;
739
740         return count;
741 }
742 static struct bin_attribute sys_reipl_fcp_scp_data_attr =
743         __BIN_ATTR(scp_data, (S_IRUGO | S_IWUSR), reipl_fcp_scpdata_read,
744                    reipl_fcp_scpdata_write, DIAG308_SCPDATA_SIZE);
745
746 static struct bin_attribute *reipl_fcp_bin_attrs[] = {
747         &sys_reipl_fcp_scp_data_attr,
748         NULL,
749 };
750
751 DEFINE_IPL_ATTR_RW(reipl_fcp, wwpn, "0x%016llx\n", "%llx\n",
752                    reipl_block_fcp->ipl_info.fcp.wwpn);
753 DEFINE_IPL_ATTR_RW(reipl_fcp, lun, "0x%016llx\n", "%llx\n",
754                    reipl_block_fcp->ipl_info.fcp.lun);
755 DEFINE_IPL_ATTR_RW(reipl_fcp, bootprog, "%lld\n", "%lld\n",
756                    reipl_block_fcp->ipl_info.fcp.bootprog);
757 DEFINE_IPL_ATTR_RW(reipl_fcp, br_lba, "%lld\n", "%lld\n",
758                    reipl_block_fcp->ipl_info.fcp.br_lba);
759 DEFINE_IPL_ATTR_RW(reipl_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
760                    reipl_block_fcp->ipl_info.fcp.devno);
761
762 static void reipl_get_ascii_loadparm(char *loadparm,
763                                      struct ipl_parameter_block *ibp)
764 {
765         memcpy(loadparm, ibp->hdr.loadparm, LOADPARM_LEN);
766         EBCASC(loadparm, LOADPARM_LEN);
767         loadparm[LOADPARM_LEN] = 0;
768         strim(loadparm);
769 }
770
771 static ssize_t reipl_generic_loadparm_show(struct ipl_parameter_block *ipb,
772                                            char *page)
773 {
774         char buf[LOADPARM_LEN + 1];
775
776         reipl_get_ascii_loadparm(buf, ipb);
777         return sprintf(page, "%s\n", buf);
778 }
779
780 static ssize_t reipl_generic_loadparm_store(struct ipl_parameter_block *ipb,
781                                             const char *buf, size_t len)
782 {
783         int i, lp_len;
784
785         /* ignore trailing newline */
786         lp_len = len;
787         if ((len > 0) && (buf[len - 1] == '\n'))
788                 lp_len--;
789         /* loadparm can have max 8 characters and must not start with a blank */
790         if ((lp_len > LOADPARM_LEN) || ((lp_len > 0) && (buf[0] == ' ')))
791                 return -EINVAL;
792         /* loadparm can only contain "a-z,A-Z,0-9,SP,." */
793         for (i = 0; i < lp_len; i++) {
794                 if (isalpha(buf[i]) || isdigit(buf[i]) || (buf[i] == ' ') ||
795                     (buf[i] == '.'))
796                         continue;
797                 return -EINVAL;
798         }
799         /* initialize loadparm with blanks */
800         memset(ipb->hdr.loadparm, ' ', LOADPARM_LEN);
801         /* copy and convert to ebcdic */
802         memcpy(ipb->hdr.loadparm, buf, lp_len);
803         ASCEBC(ipb->hdr.loadparm, LOADPARM_LEN);
804         return len;
805 }
806
807 /* FCP wrapper */
808 static ssize_t reipl_fcp_loadparm_show(struct kobject *kobj,
809                                        struct kobj_attribute *attr, char *page)
810 {
811         return reipl_generic_loadparm_show(reipl_block_fcp, page);
812 }
813
814 static ssize_t reipl_fcp_loadparm_store(struct kobject *kobj,
815                                         struct kobj_attribute *attr,
816                                         const char *buf, size_t len)
817 {
818         return reipl_generic_loadparm_store(reipl_block_fcp, buf, len);
819 }
820
821 static struct kobj_attribute sys_reipl_fcp_loadparm_attr =
822         __ATTR(loadparm, S_IRUGO | S_IWUSR, reipl_fcp_loadparm_show,
823                                             reipl_fcp_loadparm_store);
824
825 static struct attribute *reipl_fcp_attrs[] = {
826         &sys_reipl_fcp_device_attr.attr,
827         &sys_reipl_fcp_wwpn_attr.attr,
828         &sys_reipl_fcp_lun_attr.attr,
829         &sys_reipl_fcp_bootprog_attr.attr,
830         &sys_reipl_fcp_br_lba_attr.attr,
831         &sys_reipl_fcp_loadparm_attr.attr,
832         NULL,
833 };
834
835 static struct attribute_group reipl_fcp_attr_group = {
836         .attrs = reipl_fcp_attrs,
837         .bin_attrs = reipl_fcp_bin_attrs,
838 };
839
840 /* CCW reipl device attributes */
841 DEFINE_IPL_CCW_ATTR_RW(reipl_ccw, device, reipl_block_ccw->ipl_info.ccw);
842
843 /* NSS wrapper */
844 static ssize_t reipl_nss_loadparm_show(struct kobject *kobj,
845                                        struct kobj_attribute *attr, char *page)
846 {
847         return reipl_generic_loadparm_show(reipl_block_nss, page);
848 }
849
850 static ssize_t reipl_nss_loadparm_store(struct kobject *kobj,
851                                         struct kobj_attribute *attr,
852                                         const char *buf, size_t len)
853 {
854         return reipl_generic_loadparm_store(reipl_block_nss, buf, len);
855 }
856
857 /* CCW wrapper */
858 static ssize_t reipl_ccw_loadparm_show(struct kobject *kobj,
859                                        struct kobj_attribute *attr, char *page)
860 {
861         return reipl_generic_loadparm_show(reipl_block_ccw, page);
862 }
863
864 static ssize_t reipl_ccw_loadparm_store(struct kobject *kobj,
865                                         struct kobj_attribute *attr,
866                                         const char *buf, size_t len)
867 {
868         return reipl_generic_loadparm_store(reipl_block_ccw, buf, len);
869 }
870
871 static struct kobj_attribute sys_reipl_ccw_loadparm_attr =
872         __ATTR(loadparm, S_IRUGO | S_IWUSR, reipl_ccw_loadparm_show,
873                                             reipl_ccw_loadparm_store);
874
875 static struct attribute *reipl_ccw_attrs_vm[] = {
876         &sys_reipl_ccw_device_attr.attr,
877         &sys_reipl_ccw_loadparm_attr.attr,
878         &sys_reipl_ccw_vmparm_attr.attr,
879         NULL,
880 };
881
882 static struct attribute *reipl_ccw_attrs_lpar[] = {
883         &sys_reipl_ccw_device_attr.attr,
884         &sys_reipl_ccw_loadparm_attr.attr,
885         NULL,
886 };
887
888 static struct attribute_group reipl_ccw_attr_group_vm = {
889         .name  = IPL_CCW_STR,
890         .attrs = reipl_ccw_attrs_vm,
891 };
892
893 static struct attribute_group reipl_ccw_attr_group_lpar = {
894         .name  = IPL_CCW_STR,
895         .attrs = reipl_ccw_attrs_lpar,
896 };
897
898
899 /* NSS reipl device attributes */
900 static void reipl_get_ascii_nss_name(char *dst,
901                                      struct ipl_parameter_block *ipb)
902 {
903         memcpy(dst, ipb->ipl_info.ccw.nss_name, NSS_NAME_SIZE);
904         EBCASC(dst, NSS_NAME_SIZE);
905         dst[NSS_NAME_SIZE] = 0;
906 }
907
908 static ssize_t reipl_nss_name_show(struct kobject *kobj,
909                                    struct kobj_attribute *attr, char *page)
910 {
911         char nss_name[NSS_NAME_SIZE + 1] = {};
912
913         reipl_get_ascii_nss_name(nss_name, reipl_block_nss);
914         return sprintf(page, "%s\n", nss_name);
915 }
916
917 static ssize_t reipl_nss_name_store(struct kobject *kobj,
918                                     struct kobj_attribute *attr,
919                                     const char *buf, size_t len)
920 {
921         int nss_len;
922
923         /* ignore trailing newline */
924         nss_len = len;
925         if ((len > 0) && (buf[len - 1] == '\n'))
926                 nss_len--;
927
928         if (nss_len > NSS_NAME_SIZE)
929                 return -EINVAL;
930
931         memset(reipl_block_nss->ipl_info.ccw.nss_name, 0x40, NSS_NAME_SIZE);
932         if (nss_len > 0) {
933                 reipl_block_nss->ipl_info.ccw.vm_flags |=
934                         DIAG308_VM_FLAGS_NSS_VALID;
935                 memcpy(reipl_block_nss->ipl_info.ccw.nss_name, buf, nss_len);
936                 ASCEBC(reipl_block_nss->ipl_info.ccw.nss_name, nss_len);
937                 EBC_TOUPPER(reipl_block_nss->ipl_info.ccw.nss_name, nss_len);
938         } else {
939                 reipl_block_nss->ipl_info.ccw.vm_flags &=
940                         ~DIAG308_VM_FLAGS_NSS_VALID;
941         }
942
943         return len;
944 }
945
946 static struct kobj_attribute sys_reipl_nss_name_attr =
947         __ATTR(name, S_IRUGO | S_IWUSR, reipl_nss_name_show,
948                                         reipl_nss_name_store);
949
950 static struct kobj_attribute sys_reipl_nss_loadparm_attr =
951         __ATTR(loadparm, S_IRUGO | S_IWUSR, reipl_nss_loadparm_show,
952                                             reipl_nss_loadparm_store);
953
954 static struct attribute *reipl_nss_attrs[] = {
955         &sys_reipl_nss_name_attr.attr,
956         &sys_reipl_nss_loadparm_attr.attr,
957         &sys_reipl_nss_vmparm_attr.attr,
958         NULL,
959 };
960
961 static struct attribute_group reipl_nss_attr_group = {
962         .name  = IPL_NSS_STR,
963         .attrs = reipl_nss_attrs,
964 };
965
966 static void set_reipl_block_actual(struct ipl_parameter_block *reipl_block)
967 {
968         reipl_block_actual = reipl_block;
969         os_info_entry_add(OS_INFO_REIPL_BLOCK, reipl_block_actual,
970                           reipl_block->hdr.len);
971 }
972
973 /* reipl type */
974
975 static int reipl_set_type(enum ipl_type type)
976 {
977         if (!(reipl_capabilities & type))
978                 return -EINVAL;
979
980         switch(type) {
981         case IPL_TYPE_CCW:
982                 if (diag308_set_works)
983                         reipl_method = REIPL_METHOD_CCW_DIAG;
984                 else if (MACHINE_IS_VM)
985                         reipl_method = REIPL_METHOD_CCW_VM;
986                 else
987                         reipl_method = REIPL_METHOD_CCW_CIO;
988                 set_reipl_block_actual(reipl_block_ccw);
989                 break;
990         case IPL_TYPE_FCP:
991                 if (diag308_set_works)
992                         reipl_method = REIPL_METHOD_FCP_RW_DIAG;
993                 else if (MACHINE_IS_VM)
994                         reipl_method = REIPL_METHOD_FCP_RO_VM;
995                 else
996                         reipl_method = REIPL_METHOD_FCP_RO_DIAG;
997                 set_reipl_block_actual(reipl_block_fcp);
998                 break;
999         case IPL_TYPE_FCP_DUMP:
1000                 reipl_method = REIPL_METHOD_FCP_DUMP;
1001                 break;
1002         case IPL_TYPE_NSS:
1003                 if (diag308_set_works)
1004                         reipl_method = REIPL_METHOD_NSS_DIAG;
1005                 else
1006                         reipl_method = REIPL_METHOD_NSS;
1007                 set_reipl_block_actual(reipl_block_nss);
1008                 break;
1009         case IPL_TYPE_UNKNOWN:
1010                 reipl_method = REIPL_METHOD_DEFAULT;
1011                 break;
1012         default:
1013                 BUG();
1014         }
1015         reipl_type = type;
1016         return 0;
1017 }
1018
1019 static ssize_t reipl_type_show(struct kobject *kobj,
1020                                struct kobj_attribute *attr, char *page)
1021 {
1022         return sprintf(page, "%s\n", ipl_type_str(reipl_type));
1023 }
1024
1025 static ssize_t reipl_type_store(struct kobject *kobj,
1026                                 struct kobj_attribute *attr,
1027                                 const char *buf, size_t len)
1028 {
1029         int rc = -EINVAL;
1030
1031         if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
1032                 rc = reipl_set_type(IPL_TYPE_CCW);
1033         else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
1034                 rc = reipl_set_type(IPL_TYPE_FCP);
1035         else if (strncmp(buf, IPL_NSS_STR, strlen(IPL_NSS_STR)) == 0)
1036                 rc = reipl_set_type(IPL_TYPE_NSS);
1037         return (rc != 0) ? rc : len;
1038 }
1039
1040 static struct kobj_attribute reipl_type_attr =
1041         __ATTR(reipl_type, 0644, reipl_type_show, reipl_type_store);
1042
1043 static struct kset *reipl_kset;
1044 static struct kset *reipl_fcp_kset;
1045
1046 static void get_ipl_string(char *dst, struct ipl_parameter_block *ipb,
1047                            const enum ipl_method m)
1048 {
1049         char loadparm[LOADPARM_LEN + 1] = {};
1050         char vmparm[DIAG308_VMPARM_SIZE + 1] = {};
1051         char nss_name[NSS_NAME_SIZE + 1] = {};
1052         size_t pos = 0;
1053
1054         reipl_get_ascii_loadparm(loadparm, ipb);
1055         reipl_get_ascii_nss_name(nss_name, ipb);
1056         reipl_get_ascii_vmparm(vmparm, sizeof(vmparm), ipb);
1057
1058         switch (m) {
1059         case REIPL_METHOD_CCW_VM:
1060                 pos = sprintf(dst, "IPL %X CLEAR", ipb->ipl_info.ccw.devno);
1061                 break;
1062         case REIPL_METHOD_NSS:
1063                 pos = sprintf(dst, "IPL %s", nss_name);
1064                 break;
1065         default:
1066                 break;
1067         }
1068         if (strlen(loadparm) > 0)
1069                 pos += sprintf(dst + pos, " LOADPARM '%s'", loadparm);
1070         if (strlen(vmparm) > 0)
1071                 sprintf(dst + pos, " PARM %s", vmparm);
1072 }
1073
1074 static void __reipl_run(void *unused)
1075 {
1076         struct ccw_dev_id devid;
1077         static char buf[128];
1078
1079         switch (reipl_method) {
1080         case REIPL_METHOD_CCW_CIO:
1081                 devid.ssid  = reipl_block_ccw->ipl_info.ccw.ssid;
1082                 devid.devno = reipl_block_ccw->ipl_info.ccw.devno;
1083                 reipl_ccw_dev(&devid);
1084                 break;
1085         case REIPL_METHOD_CCW_VM:
1086                 get_ipl_string(buf, reipl_block_ccw, REIPL_METHOD_CCW_VM);
1087                 __cpcmd(buf, NULL, 0, NULL);
1088                 break;
1089         case REIPL_METHOD_CCW_DIAG:
1090                 diag308(DIAG308_SET, reipl_block_ccw);
1091                 if (MACHINE_IS_LPAR)
1092                         diag308(DIAG308_LOAD_NORMAL_DUMP, NULL);
1093                 else
1094                         diag308(DIAG308_LOAD_CLEAR, NULL);
1095                 break;
1096         case REIPL_METHOD_FCP_RW_DIAG:
1097                 diag308(DIAG308_SET, reipl_block_fcp);
1098                 diag308(DIAG308_LOAD_CLEAR, NULL);
1099                 break;
1100         case REIPL_METHOD_FCP_RO_DIAG:
1101                 diag308(DIAG308_LOAD_CLEAR, NULL);
1102                 break;
1103         case REIPL_METHOD_FCP_RO_VM:
1104                 __cpcmd("IPL", NULL, 0, NULL);
1105                 break;
1106         case REIPL_METHOD_NSS_DIAG:
1107                 diag308(DIAG308_SET, reipl_block_nss);
1108                 diag308(DIAG308_LOAD_CLEAR, NULL);
1109                 break;
1110         case REIPL_METHOD_NSS:
1111                 get_ipl_string(buf, reipl_block_nss, REIPL_METHOD_NSS);
1112                 __cpcmd(buf, NULL, 0, NULL);
1113                 break;
1114         case REIPL_METHOD_DEFAULT:
1115                 if (MACHINE_IS_VM)
1116                         __cpcmd("IPL", NULL, 0, NULL);
1117                 diag308(DIAG308_LOAD_CLEAR, NULL);
1118                 break;
1119         case REIPL_METHOD_FCP_DUMP:
1120                 break;
1121         }
1122         disabled_wait((unsigned long) __builtin_return_address(0));
1123 }
1124
1125 static void reipl_run(struct shutdown_trigger *trigger)
1126 {
1127         smp_call_ipl_cpu(__reipl_run, NULL);
1128 }
1129
1130 static void reipl_block_ccw_init(struct ipl_parameter_block *ipb)
1131 {
1132         ipb->hdr.len = IPL_PARM_BLK_CCW_LEN;
1133         ipb->hdr.version = IPL_PARM_BLOCK_VERSION;
1134         ipb->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
1135         ipb->hdr.pbt = DIAG308_IPL_TYPE_CCW;
1136 }
1137
1138 static void reipl_block_ccw_fill_parms(struct ipl_parameter_block *ipb)
1139 {
1140         /* LOADPARM */
1141         /* check if read scp info worked and set loadparm */
1142         if (sclp_ipl_info.is_valid)
1143                 memcpy(ipb->hdr.loadparm, &sclp_ipl_info.loadparm, LOADPARM_LEN);
1144         else
1145                 /* read scp info failed: set empty loadparm (EBCDIC blanks) */
1146                 memset(ipb->hdr.loadparm, 0x40, LOADPARM_LEN);
1147         ipb->hdr.flags = DIAG308_FLAGS_LP_VALID;
1148
1149         /* VM PARM */
1150         if (MACHINE_IS_VM && diag308_set_works &&
1151             (ipl_block.ipl_info.ccw.vm_flags & DIAG308_VM_FLAGS_VP_VALID)) {
1152
1153                 ipb->ipl_info.ccw.vm_flags |= DIAG308_VM_FLAGS_VP_VALID;
1154                 ipb->ipl_info.ccw.vm_parm_len =
1155                                         ipl_block.ipl_info.ccw.vm_parm_len;
1156                 memcpy(ipb->ipl_info.ccw.vm_parm,
1157                        ipl_block.ipl_info.ccw.vm_parm, DIAG308_VMPARM_SIZE);
1158         }
1159 }
1160
1161 static int __init reipl_nss_init(void)
1162 {
1163         int rc;
1164
1165         if (!MACHINE_IS_VM)
1166                 return 0;
1167
1168         reipl_block_nss = (void *) get_zeroed_page(GFP_KERNEL);
1169         if (!reipl_block_nss)
1170                 return -ENOMEM;
1171
1172         if (!diag308_set_works)
1173                 sys_reipl_nss_vmparm_attr.attr.mode = S_IRUGO;
1174
1175         rc = sysfs_create_group(&reipl_kset->kobj, &reipl_nss_attr_group);
1176         if (rc)
1177                 return rc;
1178
1179         reipl_block_ccw_init(reipl_block_nss);
1180         if (ipl_info.type == IPL_TYPE_NSS) {
1181                 memset(reipl_block_nss->ipl_info.ccw.nss_name,
1182                         ' ', NSS_NAME_SIZE);
1183                 memcpy(reipl_block_nss->ipl_info.ccw.nss_name,
1184                         kernel_nss_name, strlen(kernel_nss_name));
1185                 ASCEBC(reipl_block_nss->ipl_info.ccw.nss_name, NSS_NAME_SIZE);
1186                 reipl_block_nss->ipl_info.ccw.vm_flags |=
1187                         DIAG308_VM_FLAGS_NSS_VALID;
1188
1189                 reipl_block_ccw_fill_parms(reipl_block_nss);
1190         }
1191
1192         reipl_capabilities |= IPL_TYPE_NSS;
1193         return 0;
1194 }
1195
1196 static int __init reipl_ccw_init(void)
1197 {
1198         int rc;
1199
1200         reipl_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
1201         if (!reipl_block_ccw)
1202                 return -ENOMEM;
1203
1204         if (MACHINE_IS_VM) {
1205                 if (!diag308_set_works)
1206                         sys_reipl_ccw_vmparm_attr.attr.mode = S_IRUGO;
1207                 rc = sysfs_create_group(&reipl_kset->kobj,
1208                                         &reipl_ccw_attr_group_vm);
1209         } else {
1210                 if(!diag308_set_works)
1211                         sys_reipl_ccw_loadparm_attr.attr.mode = S_IRUGO;
1212                 rc = sysfs_create_group(&reipl_kset->kobj,
1213                                         &reipl_ccw_attr_group_lpar);
1214         }
1215         if (rc)
1216                 return rc;
1217
1218         reipl_block_ccw_init(reipl_block_ccw);
1219         if (ipl_info.type == IPL_TYPE_CCW) {
1220                 reipl_block_ccw->ipl_info.ccw.ssid = ipl_ssid;
1221                 reipl_block_ccw->ipl_info.ccw.devno = ipl_devno;
1222                 reipl_block_ccw_fill_parms(reipl_block_ccw);
1223         }
1224
1225         reipl_capabilities |= IPL_TYPE_CCW;
1226         return 0;
1227 }
1228
1229 static int __init reipl_fcp_init(void)
1230 {
1231         int rc;
1232
1233         if (!diag308_set_works) {
1234                 if (ipl_info.type == IPL_TYPE_FCP) {
1235                         make_attrs_ro(reipl_fcp_attrs);
1236                         sys_reipl_fcp_scp_data_attr.attr.mode = S_IRUGO;
1237                 } else
1238                         return 0;
1239         }
1240
1241         reipl_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
1242         if (!reipl_block_fcp)
1243                 return -ENOMEM;
1244
1245         /* sysfs: create fcp kset for mixing attr group and bin attrs */
1246         reipl_fcp_kset = kset_create_and_add(IPL_FCP_STR, NULL,
1247                                              &reipl_kset->kobj);
1248         if (!reipl_fcp_kset) {
1249                 free_page((unsigned long) reipl_block_fcp);
1250                 return -ENOMEM;
1251         }
1252
1253         rc = sysfs_create_group(&reipl_fcp_kset->kobj, &reipl_fcp_attr_group);
1254         if (rc) {
1255                 kset_unregister(reipl_fcp_kset);
1256                 free_page((unsigned long) reipl_block_fcp);
1257                 return rc;
1258         }
1259
1260         if (ipl_info.type == IPL_TYPE_FCP) {
1261                 memcpy(reipl_block_fcp, IPL_PARMBLOCK_START, PAGE_SIZE);
1262                 /*
1263                  * Fix loadparm: There are systems where the (SCSI) LOADPARM
1264                  * is invalid in the SCSI IPL parameter block, so take it
1265                  * always from sclp_ipl_info.
1266                  */
1267                 memcpy(reipl_block_fcp->hdr.loadparm, sclp_ipl_info.loadparm,
1268                        LOADPARM_LEN);
1269         } else {
1270                 reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
1271                 reipl_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
1272                 reipl_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
1273                 reipl_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
1274                 reipl_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_IPL;
1275         }
1276         reipl_capabilities |= IPL_TYPE_FCP;
1277         return 0;
1278 }
1279
1280 static int __init reipl_type_init(void)
1281 {
1282         enum ipl_type reipl_type = ipl_info.type;
1283         struct ipl_parameter_block *reipl_block;
1284         unsigned long size;
1285
1286         reipl_block = os_info_old_entry(OS_INFO_REIPL_BLOCK, &size);
1287         if (!reipl_block)
1288                 goto out;
1289         /*
1290          * If we have an OS info reipl block, this will be used
1291          */
1292         if (reipl_block->hdr.pbt == DIAG308_IPL_TYPE_FCP) {
1293                 memcpy(reipl_block_fcp, reipl_block, size);
1294                 reipl_type = IPL_TYPE_FCP;
1295         } else if (reipl_block->hdr.pbt == DIAG308_IPL_TYPE_CCW) {
1296                 memcpy(reipl_block_ccw, reipl_block, size);
1297                 reipl_type = IPL_TYPE_CCW;
1298         }
1299 out:
1300         return reipl_set_type(reipl_type);
1301 }
1302
1303 static int __init reipl_init(void)
1304 {
1305         int rc;
1306
1307         reipl_kset = kset_create_and_add("reipl", NULL, firmware_kobj);
1308         if (!reipl_kset)
1309                 return -ENOMEM;
1310         rc = sysfs_create_file(&reipl_kset->kobj, &reipl_type_attr.attr);
1311         if (rc) {
1312                 kset_unregister(reipl_kset);
1313                 return rc;
1314         }
1315         rc = reipl_ccw_init();
1316         if (rc)
1317                 return rc;
1318         rc = reipl_fcp_init();
1319         if (rc)
1320                 return rc;
1321         rc = reipl_nss_init();
1322         if (rc)
1323                 return rc;
1324         return reipl_type_init();
1325 }
1326
1327 static struct shutdown_action __refdata reipl_action = {
1328         .name   = SHUTDOWN_ACTION_REIPL_STR,
1329         .fn     = reipl_run,
1330         .init   = reipl_init,
1331 };
1332
1333 /*
1334  * dump shutdown action: Dump Linux on shutdown.
1335  */
1336
1337 /* FCP dump device attributes */
1338
1339 DEFINE_IPL_ATTR_RW(dump_fcp, wwpn, "0x%016llx\n", "%llx\n",
1340                    dump_block_fcp->ipl_info.fcp.wwpn);
1341 DEFINE_IPL_ATTR_RW(dump_fcp, lun, "0x%016llx\n", "%llx\n",
1342                    dump_block_fcp->ipl_info.fcp.lun);
1343 DEFINE_IPL_ATTR_RW(dump_fcp, bootprog, "%lld\n", "%lld\n",
1344                    dump_block_fcp->ipl_info.fcp.bootprog);
1345 DEFINE_IPL_ATTR_RW(dump_fcp, br_lba, "%lld\n", "%lld\n",
1346                    dump_block_fcp->ipl_info.fcp.br_lba);
1347 DEFINE_IPL_ATTR_RW(dump_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
1348                    dump_block_fcp->ipl_info.fcp.devno);
1349
1350 static struct attribute *dump_fcp_attrs[] = {
1351         &sys_dump_fcp_device_attr.attr,
1352         &sys_dump_fcp_wwpn_attr.attr,
1353         &sys_dump_fcp_lun_attr.attr,
1354         &sys_dump_fcp_bootprog_attr.attr,
1355         &sys_dump_fcp_br_lba_attr.attr,
1356         NULL,
1357 };
1358
1359 static struct attribute_group dump_fcp_attr_group = {
1360         .name  = IPL_FCP_STR,
1361         .attrs = dump_fcp_attrs,
1362 };
1363
1364 /* CCW dump device attributes */
1365 DEFINE_IPL_CCW_ATTR_RW(dump_ccw, device, dump_block_ccw->ipl_info.ccw);
1366
1367 static struct attribute *dump_ccw_attrs[] = {
1368         &sys_dump_ccw_device_attr.attr,
1369         NULL,
1370 };
1371
1372 static struct attribute_group dump_ccw_attr_group = {
1373         .name  = IPL_CCW_STR,
1374         .attrs = dump_ccw_attrs,
1375 };
1376
1377 /* dump type */
1378
1379 static int dump_set_type(enum dump_type type)
1380 {
1381         if (!(dump_capabilities & type))
1382                 return -EINVAL;
1383         switch (type) {
1384         case DUMP_TYPE_CCW:
1385                 if (diag308_set_works)
1386                         dump_method = DUMP_METHOD_CCW_DIAG;
1387                 else if (MACHINE_IS_VM)
1388                         dump_method = DUMP_METHOD_CCW_VM;
1389                 else
1390                         dump_method = DUMP_METHOD_CCW_CIO;
1391                 break;
1392         case DUMP_TYPE_FCP:
1393                 dump_method = DUMP_METHOD_FCP_DIAG;
1394                 break;
1395         default:
1396                 dump_method = DUMP_METHOD_NONE;
1397         }
1398         dump_type = type;
1399         return 0;
1400 }
1401
1402 static ssize_t dump_type_show(struct kobject *kobj,
1403                               struct kobj_attribute *attr, char *page)
1404 {
1405         return sprintf(page, "%s\n", dump_type_str(dump_type));
1406 }
1407
1408 static ssize_t dump_type_store(struct kobject *kobj,
1409                                struct kobj_attribute *attr,
1410                                const char *buf, size_t len)
1411 {
1412         int rc = -EINVAL;
1413
1414         if (strncmp(buf, DUMP_NONE_STR, strlen(DUMP_NONE_STR)) == 0)
1415                 rc = dump_set_type(DUMP_TYPE_NONE);
1416         else if (strncmp(buf, DUMP_CCW_STR, strlen(DUMP_CCW_STR)) == 0)
1417                 rc = dump_set_type(DUMP_TYPE_CCW);
1418         else if (strncmp(buf, DUMP_FCP_STR, strlen(DUMP_FCP_STR)) == 0)
1419                 rc = dump_set_type(DUMP_TYPE_FCP);
1420         return (rc != 0) ? rc : len;
1421 }
1422
1423 static struct kobj_attribute dump_type_attr =
1424         __ATTR(dump_type, 0644, dump_type_show, dump_type_store);
1425
1426 static struct kset *dump_kset;
1427
1428 static void diag308_dump(void *dump_block)
1429 {
1430         diag308(DIAG308_SET, dump_block);
1431         while (1) {
1432                 if (diag308(DIAG308_LOAD_NORMAL_DUMP, NULL) != 0x302)
1433                         break;
1434                 udelay_simple(USEC_PER_SEC);
1435         }
1436 }
1437
1438 static void __dump_run(void *unused)
1439 {
1440         struct ccw_dev_id devid;
1441         static char buf[100];
1442
1443         switch (dump_method) {
1444         case DUMP_METHOD_CCW_CIO:
1445                 devid.ssid  = dump_block_ccw->ipl_info.ccw.ssid;
1446                 devid.devno = dump_block_ccw->ipl_info.ccw.devno;
1447                 reipl_ccw_dev(&devid);
1448                 break;
1449         case DUMP_METHOD_CCW_VM:
1450                 sprintf(buf, "STORE STATUS");
1451                 __cpcmd(buf, NULL, 0, NULL);
1452                 sprintf(buf, "IPL %X", dump_block_ccw->ipl_info.ccw.devno);
1453                 __cpcmd(buf, NULL, 0, NULL);
1454                 break;
1455         case DUMP_METHOD_CCW_DIAG:
1456                 diag308_dump(dump_block_ccw);
1457                 break;
1458         case DUMP_METHOD_FCP_DIAG:
1459                 diag308_dump(dump_block_fcp);
1460                 break;
1461         default:
1462                 break;
1463         }
1464 }
1465
1466 static void dump_run(struct shutdown_trigger *trigger)
1467 {
1468         if (dump_method == DUMP_METHOD_NONE)
1469                 return;
1470         smp_send_stop();
1471         smp_call_ipl_cpu(__dump_run, NULL);
1472 }
1473
1474 static int __init dump_ccw_init(void)
1475 {
1476         int rc;
1477
1478         dump_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
1479         if (!dump_block_ccw)
1480                 return -ENOMEM;
1481         rc = sysfs_create_group(&dump_kset->kobj, &dump_ccw_attr_group);
1482         if (rc) {
1483                 free_page((unsigned long)dump_block_ccw);
1484                 return rc;
1485         }
1486         dump_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
1487         dump_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
1488         dump_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
1489         dump_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
1490         dump_capabilities |= DUMP_TYPE_CCW;
1491         return 0;
1492 }
1493
1494 static int __init dump_fcp_init(void)
1495 {
1496         int rc;
1497
1498         if (!sclp_ipl_info.has_dump)
1499                 return 0; /* LDIPL DUMP is not installed */
1500         if (!diag308_set_works)
1501                 return 0;
1502         dump_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
1503         if (!dump_block_fcp)
1504                 return -ENOMEM;
1505         rc = sysfs_create_group(&dump_kset->kobj, &dump_fcp_attr_group);
1506         if (rc) {
1507                 free_page((unsigned long)dump_block_fcp);
1508                 return rc;
1509         }
1510         dump_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
1511         dump_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
1512         dump_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
1513         dump_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
1514         dump_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_DUMP;
1515         dump_capabilities |= DUMP_TYPE_FCP;
1516         return 0;
1517 }
1518
1519 static int __init dump_init(void)
1520 {
1521         int rc;
1522
1523         dump_kset = kset_create_and_add("dump", NULL, firmware_kobj);
1524         if (!dump_kset)
1525                 return -ENOMEM;
1526         rc = sysfs_create_file(&dump_kset->kobj, &dump_type_attr.attr);
1527         if (rc) {
1528                 kset_unregister(dump_kset);
1529                 return rc;
1530         }
1531         rc = dump_ccw_init();
1532         if (rc)
1533                 return rc;
1534         rc = dump_fcp_init();
1535         if (rc)
1536                 return rc;
1537         dump_set_type(DUMP_TYPE_NONE);
1538         return 0;
1539 }
1540
1541 static struct shutdown_action __refdata dump_action = {
1542         .name   = SHUTDOWN_ACTION_DUMP_STR,
1543         .fn     = dump_run,
1544         .init   = dump_init,
1545 };
1546
1547 static void dump_reipl_run(struct shutdown_trigger *trigger)
1548 {
1549         unsigned long ipib = (unsigned long) reipl_block_actual;
1550         unsigned int csum;
1551
1552         csum = (__force unsigned int)
1553                csum_partial(reipl_block_actual, reipl_block_actual->hdr.len, 0);
1554         mem_assign_absolute(S390_lowcore.ipib, ipib);
1555         mem_assign_absolute(S390_lowcore.ipib_checksum, csum);
1556         dump_run(trigger);
1557 }
1558
1559 static int __init dump_reipl_init(void)
1560 {
1561         if (!diag308_set_works)
1562                 return -EOPNOTSUPP;
1563         else
1564                 return 0;
1565 }
1566
1567 static struct shutdown_action __refdata dump_reipl_action = {
1568         .name   = SHUTDOWN_ACTION_DUMP_REIPL_STR,
1569         .fn     = dump_reipl_run,
1570         .init   = dump_reipl_init,
1571 };
1572
1573 /*
1574  * vmcmd shutdown action: Trigger vm command on shutdown.
1575  */
1576
1577 static char vmcmd_on_reboot[128];
1578 static char vmcmd_on_panic[128];
1579 static char vmcmd_on_halt[128];
1580 static char vmcmd_on_poff[128];
1581 static char vmcmd_on_restart[128];
1582
1583 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_reboot, "%s\n", "%s\n", vmcmd_on_reboot);
1584 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_panic, "%s\n", "%s\n", vmcmd_on_panic);
1585 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_halt, "%s\n", "%s\n", vmcmd_on_halt);
1586 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_poff, "%s\n", "%s\n", vmcmd_on_poff);
1587 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_restart, "%s\n", "%s\n", vmcmd_on_restart);
1588
1589 static struct attribute *vmcmd_attrs[] = {
1590         &sys_vmcmd_on_reboot_attr.attr,
1591         &sys_vmcmd_on_panic_attr.attr,
1592         &sys_vmcmd_on_halt_attr.attr,
1593         &sys_vmcmd_on_poff_attr.attr,
1594         &sys_vmcmd_on_restart_attr.attr,
1595         NULL,
1596 };
1597
1598 static struct attribute_group vmcmd_attr_group = {
1599         .attrs = vmcmd_attrs,
1600 };
1601
1602 static struct kset *vmcmd_kset;
1603
1604 static void vmcmd_run(struct shutdown_trigger *trigger)
1605 {
1606         char *cmd;
1607
1608         if (strcmp(trigger->name, ON_REIPL_STR) == 0)
1609                 cmd = vmcmd_on_reboot;
1610         else if (strcmp(trigger->name, ON_PANIC_STR) == 0)
1611                 cmd = vmcmd_on_panic;
1612         else if (strcmp(trigger->name, ON_HALT_STR) == 0)
1613                 cmd = vmcmd_on_halt;
1614         else if (strcmp(trigger->name, ON_POFF_STR) == 0)
1615                 cmd = vmcmd_on_poff;
1616         else if (strcmp(trigger->name, ON_RESTART_STR) == 0)
1617                 cmd = vmcmd_on_restart;
1618         else
1619                 return;
1620
1621         if (strlen(cmd) == 0)
1622                 return;
1623         __cpcmd(cmd, NULL, 0, NULL);
1624 }
1625
1626 static int vmcmd_init(void)
1627 {
1628         if (!MACHINE_IS_VM)
1629                 return -EOPNOTSUPP;
1630         vmcmd_kset = kset_create_and_add("vmcmd", NULL, firmware_kobj);
1631         if (!vmcmd_kset)
1632                 return -ENOMEM;
1633         return sysfs_create_group(&vmcmd_kset->kobj, &vmcmd_attr_group);
1634 }
1635
1636 static struct shutdown_action vmcmd_action = {SHUTDOWN_ACTION_VMCMD_STR,
1637                                               vmcmd_run, vmcmd_init};
1638
1639 /*
1640  * stop shutdown action: Stop Linux on shutdown.
1641  */
1642
1643 static void stop_run(struct shutdown_trigger *trigger)
1644 {
1645         if (strcmp(trigger->name, ON_PANIC_STR) == 0 ||
1646             strcmp(trigger->name, ON_RESTART_STR) == 0)
1647                 disabled_wait((unsigned long) __builtin_return_address(0));
1648         smp_stop_cpu();
1649 }
1650
1651 static struct shutdown_action stop_action = {SHUTDOWN_ACTION_STOP_STR,
1652                                              stop_run, NULL};
1653
1654 /* action list */
1655
1656 static struct shutdown_action *shutdown_actions_list[] = {
1657         &ipl_action, &reipl_action, &dump_reipl_action, &dump_action,
1658         &vmcmd_action, &stop_action};
1659 #define SHUTDOWN_ACTIONS_COUNT (sizeof(shutdown_actions_list) / sizeof(void *))
1660
1661 /*
1662  * Trigger section
1663  */
1664
1665 static struct kset *shutdown_actions_kset;
1666
1667 static int set_trigger(const char *buf, struct shutdown_trigger *trigger,
1668                        size_t len)
1669 {
1670         int i;
1671
1672         for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
1673                 if (sysfs_streq(buf, shutdown_actions_list[i]->name)) {
1674                         if (shutdown_actions_list[i]->init_rc) {
1675                                 return shutdown_actions_list[i]->init_rc;
1676                         } else {
1677                                 trigger->action = shutdown_actions_list[i];
1678                                 return len;
1679                         }
1680                 }
1681         }
1682         return -EINVAL;
1683 }
1684
1685 /* on reipl */
1686
1687 static struct shutdown_trigger on_reboot_trigger = {ON_REIPL_STR,
1688                                                     &reipl_action};
1689
1690 static ssize_t on_reboot_show(struct kobject *kobj,
1691                               struct kobj_attribute *attr, char *page)
1692 {
1693         return sprintf(page, "%s\n", on_reboot_trigger.action->name);
1694 }
1695
1696 static ssize_t on_reboot_store(struct kobject *kobj,
1697                                struct kobj_attribute *attr,
1698                                const char *buf, size_t len)
1699 {
1700         return set_trigger(buf, &on_reboot_trigger, len);
1701 }
1702 static struct kobj_attribute on_reboot_attr = __ATTR_RW(on_reboot);
1703
1704 static void do_machine_restart(char *__unused)
1705 {
1706         smp_send_stop();
1707         on_reboot_trigger.action->fn(&on_reboot_trigger);
1708         reipl_run(NULL);
1709 }
1710 void (*_machine_restart)(char *command) = do_machine_restart;
1711
1712 /* on panic */
1713
1714 static struct shutdown_trigger on_panic_trigger = {ON_PANIC_STR, &stop_action};
1715
1716 static ssize_t on_panic_show(struct kobject *kobj,
1717                              struct kobj_attribute *attr, char *page)
1718 {
1719         return sprintf(page, "%s\n", on_panic_trigger.action->name);
1720 }
1721
1722 static ssize_t on_panic_store(struct kobject *kobj,
1723                               struct kobj_attribute *attr,
1724                               const char *buf, size_t len)
1725 {
1726         return set_trigger(buf, &on_panic_trigger, len);
1727 }
1728 static struct kobj_attribute on_panic_attr = __ATTR_RW(on_panic);
1729
1730 static void do_panic(void)
1731 {
1732         lgr_info_log();
1733         on_panic_trigger.action->fn(&on_panic_trigger);
1734         stop_run(&on_panic_trigger);
1735 }
1736
1737 /* on restart */
1738
1739 static struct shutdown_trigger on_restart_trigger = {ON_RESTART_STR,
1740         &stop_action};
1741
1742 static ssize_t on_restart_show(struct kobject *kobj,
1743                                struct kobj_attribute *attr, char *page)
1744 {
1745         return sprintf(page, "%s\n", on_restart_trigger.action->name);
1746 }
1747
1748 static ssize_t on_restart_store(struct kobject *kobj,
1749                                 struct kobj_attribute *attr,
1750                                 const char *buf, size_t len)
1751 {
1752         return set_trigger(buf, &on_restart_trigger, len);
1753 }
1754 static struct kobj_attribute on_restart_attr = __ATTR_RW(on_restart);
1755
1756 static void __do_restart(void *ignore)
1757 {
1758         __arch_local_irq_stosm(0x04); /* enable DAT */
1759         smp_send_stop();
1760 #ifdef CONFIG_CRASH_DUMP
1761         crash_kexec(NULL);
1762 #endif
1763         on_restart_trigger.action->fn(&on_restart_trigger);
1764         stop_run(&on_restart_trigger);
1765 }
1766
1767 void do_restart(void)
1768 {
1769         tracing_off();
1770         debug_locks_off();
1771         lgr_info_log();
1772         smp_call_online_cpu(__do_restart, NULL);
1773 }
1774
1775 /* on halt */
1776
1777 static struct shutdown_trigger on_halt_trigger = {ON_HALT_STR, &stop_action};
1778
1779 static ssize_t on_halt_show(struct kobject *kobj,
1780                             struct kobj_attribute *attr, char *page)
1781 {
1782         return sprintf(page, "%s\n", on_halt_trigger.action->name);
1783 }
1784
1785 static ssize_t on_halt_store(struct kobject *kobj,
1786                              struct kobj_attribute *attr,
1787                              const char *buf, size_t len)
1788 {
1789         return set_trigger(buf, &on_halt_trigger, len);
1790 }
1791 static struct kobj_attribute on_halt_attr = __ATTR_RW(on_halt);
1792
1793 static void do_machine_halt(void)
1794 {
1795         smp_send_stop();
1796         on_halt_trigger.action->fn(&on_halt_trigger);
1797         stop_run(&on_halt_trigger);
1798 }
1799 void (*_machine_halt)(void) = do_machine_halt;
1800
1801 /* on power off */
1802
1803 static struct shutdown_trigger on_poff_trigger = {ON_POFF_STR, &stop_action};
1804
1805 static ssize_t on_poff_show(struct kobject *kobj,
1806                             struct kobj_attribute *attr, char *page)
1807 {
1808         return sprintf(page, "%s\n", on_poff_trigger.action->name);
1809 }
1810
1811 static ssize_t on_poff_store(struct kobject *kobj,
1812                              struct kobj_attribute *attr,
1813                              const char *buf, size_t len)
1814 {
1815         return set_trigger(buf, &on_poff_trigger, len);
1816 }
1817 static struct kobj_attribute on_poff_attr = __ATTR_RW(on_poff);
1818
1819 static void do_machine_power_off(void)
1820 {
1821         smp_send_stop();
1822         on_poff_trigger.action->fn(&on_poff_trigger);
1823         stop_run(&on_poff_trigger);
1824 }
1825 void (*_machine_power_off)(void) = do_machine_power_off;
1826
1827 static struct attribute *shutdown_action_attrs[] = {
1828         &on_restart_attr.attr,
1829         &on_reboot_attr.attr,
1830         &on_panic_attr.attr,
1831         &on_halt_attr.attr,
1832         &on_poff_attr.attr,
1833         NULL,
1834 };
1835
1836 static struct attribute_group shutdown_action_attr_group = {
1837         .attrs = shutdown_action_attrs,
1838 };
1839
1840 static void __init shutdown_triggers_init(void)
1841 {
1842         shutdown_actions_kset = kset_create_and_add("shutdown_actions", NULL,
1843                                                     firmware_kobj);
1844         if (!shutdown_actions_kset)
1845                 goto fail;
1846         if (sysfs_create_group(&shutdown_actions_kset->kobj,
1847                                &shutdown_action_attr_group))
1848                 goto fail;
1849         return;
1850 fail:
1851         panic("shutdown_triggers_init failed\n");
1852 }
1853
1854 static void __init shutdown_actions_init(void)
1855 {
1856         int i;
1857
1858         for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
1859                 if (!shutdown_actions_list[i]->init)
1860                         continue;
1861                 shutdown_actions_list[i]->init_rc =
1862                         shutdown_actions_list[i]->init();
1863         }
1864 }
1865
1866 static int __init s390_ipl_init(void)
1867 {
1868         char str[8] = {0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40};
1869
1870         sclp_early_get_ipl_info(&sclp_ipl_info);
1871         /*
1872          * Fix loadparm: There are systems where the (SCSI) LOADPARM
1873          * returned by read SCP info is invalid (contains EBCDIC blanks)
1874          * when the system has been booted via diag308. In that case we use
1875          * the value from diag308, if available.
1876          *
1877          * There are also systems where diag308 store does not work in
1878          * case the system is booted from HMC. Fortunately in this case
1879          * READ SCP info provides the correct value.
1880          */
1881         if (memcmp(sclp_ipl_info.loadparm, str, sizeof(str)) == 0 &&
1882             diag308_set_works)
1883                 memcpy(sclp_ipl_info.loadparm, ipl_block.hdr.loadparm,
1884                        LOADPARM_LEN);
1885         shutdown_actions_init();
1886         shutdown_triggers_init();
1887         return 0;
1888 }
1889
1890 __initcall(s390_ipl_init);
1891
1892 static void __init strncpy_skip_quote(char *dst, char *src, int n)
1893 {
1894         int sx, dx;
1895
1896         dx = 0;
1897         for (sx = 0; src[sx] != 0; sx++) {
1898                 if (src[sx] == '"')
1899                         continue;
1900                 dst[dx++] = src[sx];
1901                 if (dx >= n)
1902                         break;
1903         }
1904 }
1905
1906 static int __init vmcmd_on_reboot_setup(char *str)
1907 {
1908         if (!MACHINE_IS_VM)
1909                 return 1;
1910         strncpy_skip_quote(vmcmd_on_reboot, str, 127);
1911         vmcmd_on_reboot[127] = 0;
1912         on_reboot_trigger.action = &vmcmd_action;
1913         return 1;
1914 }
1915 __setup("vmreboot=", vmcmd_on_reboot_setup);
1916
1917 static int __init vmcmd_on_panic_setup(char *str)
1918 {
1919         if (!MACHINE_IS_VM)
1920                 return 1;
1921         strncpy_skip_quote(vmcmd_on_panic, str, 127);
1922         vmcmd_on_panic[127] = 0;
1923         on_panic_trigger.action = &vmcmd_action;
1924         return 1;
1925 }
1926 __setup("vmpanic=", vmcmd_on_panic_setup);
1927
1928 static int __init vmcmd_on_halt_setup(char *str)
1929 {
1930         if (!MACHINE_IS_VM)
1931                 return 1;
1932         strncpy_skip_quote(vmcmd_on_halt, str, 127);
1933         vmcmd_on_halt[127] = 0;
1934         on_halt_trigger.action = &vmcmd_action;
1935         return 1;
1936 }
1937 __setup("vmhalt=", vmcmd_on_halt_setup);
1938
1939 static int __init vmcmd_on_poff_setup(char *str)
1940 {
1941         if (!MACHINE_IS_VM)
1942                 return 1;
1943         strncpy_skip_quote(vmcmd_on_poff, str, 127);
1944         vmcmd_on_poff[127] = 0;
1945         on_poff_trigger.action = &vmcmd_action;
1946         return 1;
1947 }
1948 __setup("vmpoff=", vmcmd_on_poff_setup);
1949
1950 static int on_panic_notify(struct notifier_block *self,
1951                            unsigned long event, void *data)
1952 {
1953         do_panic();
1954         return NOTIFY_OK;
1955 }
1956
1957 static struct notifier_block on_panic_nb = {
1958         .notifier_call = on_panic_notify,
1959         .priority = INT_MIN,
1960 };
1961
1962 void __init setup_ipl(void)
1963 {
1964         ipl_info.type = get_ipl_type();
1965         switch (ipl_info.type) {
1966         case IPL_TYPE_CCW:
1967                 ipl_info.data.ccw.dev_id.ssid = ipl_ssid;
1968                 ipl_info.data.ccw.dev_id.devno = ipl_devno;
1969                 break;
1970         case IPL_TYPE_FCP:
1971         case IPL_TYPE_FCP_DUMP:
1972                 ipl_info.data.fcp.dev_id.ssid = 0;
1973                 ipl_info.data.fcp.dev_id.devno =
1974                         IPL_PARMBLOCK_START->ipl_info.fcp.devno;
1975                 ipl_info.data.fcp.wwpn = IPL_PARMBLOCK_START->ipl_info.fcp.wwpn;
1976                 ipl_info.data.fcp.lun = IPL_PARMBLOCK_START->ipl_info.fcp.lun;
1977                 break;
1978         case IPL_TYPE_NSS:
1979                 strncpy(ipl_info.data.nss.name, kernel_nss_name,
1980                         sizeof(ipl_info.data.nss.name));
1981                 break;
1982         case IPL_TYPE_UNKNOWN:
1983                 /* We have no info to copy */
1984                 break;
1985         }
1986         atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
1987 }
1988
1989 void __init ipl_update_parameters(void)
1990 {
1991         int rc;
1992
1993         rc = diag308(DIAG308_STORE, &ipl_block);
1994         if ((rc == DIAG308_RC_OK) || (rc == DIAG308_RC_NOCONFIG))
1995                 diag308_set_works = 1;
1996 }
1997
1998 void __init ipl_verify_parameters(void)
1999 {
2000         struct cio_iplinfo iplinfo;
2001
2002         if (cio_get_iplinfo(&iplinfo))
2003                 return;
2004
2005         ipl_ssid = iplinfo.ssid;
2006         ipl_devno = iplinfo.devno;
2007         ipl_flags |= IPL_DEVNO_VALID;
2008         if (!iplinfo.is_qdio)
2009                 return;
2010         ipl_flags |= IPL_PARMBLOCK_VALID;
2011 }
2012
2013 static LIST_HEAD(rcall);
2014 static DEFINE_MUTEX(rcall_mutex);
2015
2016 void register_reset_call(struct reset_call *reset)
2017 {
2018         mutex_lock(&rcall_mutex);
2019         list_add(&reset->list, &rcall);
2020         mutex_unlock(&rcall_mutex);
2021 }
2022 EXPORT_SYMBOL_GPL(register_reset_call);
2023
2024 void unregister_reset_call(struct reset_call *reset)
2025 {
2026         mutex_lock(&rcall_mutex);
2027         list_del(&reset->list);
2028         mutex_unlock(&rcall_mutex);
2029 }
2030 EXPORT_SYMBOL_GPL(unregister_reset_call);
2031
2032 static void do_reset_calls(void)
2033 {
2034         struct reset_call *reset;
2035
2036         if (diag308_set_works) {
2037                 diag308_reset();
2038                 return;
2039         }
2040         list_for_each_entry(reset, &rcall, list)
2041                 reset->fn();
2042 }
2043
2044 void s390_reset_system(void)
2045 {
2046         struct lowcore *lc;
2047
2048         lc = (struct lowcore *)(unsigned long) store_prefix();
2049
2050         /* Stack for interrupt/machine check handler */
2051         lc->panic_stack = S390_lowcore.panic_stack;
2052
2053         /* Disable prefixing */
2054         set_prefix(0);
2055
2056         /* Disable lowcore protection */
2057         __ctl_clear_bit(0,28);
2058
2059         /* Set new machine check handler */
2060         S390_lowcore.mcck_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT;
2061         S390_lowcore.mcck_new_psw.addr =
2062                 (unsigned long) s390_base_mcck_handler;
2063
2064         /* Set new program check handler */
2065         S390_lowcore.program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT;
2066         S390_lowcore.program_new_psw.addr =
2067                 (unsigned long) s390_base_pgm_handler;
2068
2069         do_reset_calls();
2070 }