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Linux/arch/s390/kernel/ipl.c

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  1 /*
  2  *  arch/s390/kernel/ipl.c
  3  *    ipl/reipl/dump support for Linux on s390.
  4  *
  5  *    Copyright IBM Corp. 2005,2012
  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 <linux/fs.h>
 18 #include <linux/gfp.h>
 19 #include <linux/crash_dump.h>
 20 #include <linux/debug_locks.h>
 21 #include <asm/ipl.h>
 22 #include <asm/smp.h>
 23 #include <asm/setup.h>
 24 #include <asm/cpcmd.h>
 25 #include <asm/cio.h>
 26 #include <asm/ebcdic.h>
 27 #include <asm/reset.h>
 28 #include <asm/sclp.h>
 29 #include <asm/checksum.h>
 30 #include <asm/debug.h>
 31 #include <asm/os_info.h>
 32 #include "entry.h"
 33 
 34 #define IPL_PARM_BLOCK_VERSION 0
 35 
 36 #define IPL_UNKNOWN_STR         "unknown"
 37 #define IPL_CCW_STR             "ccw"
 38 #define IPL_FCP_STR             "fcp"
 39 #define IPL_FCP_DUMP_STR        "fcp_dump"
 40 #define IPL_NSS_STR             "nss"
 41 
 42 #define DUMP_CCW_STR            "ccw"
 43 #define DUMP_FCP_STR            "fcp"
 44 #define DUMP_NONE_STR           "none"
 45 
 46 /*
 47  * Four shutdown trigger types are supported:
 48  * - panic
 49  * - halt
 50  * - power off
 51  * - reipl
 52  * - restart
 53  */
 54 #define ON_PANIC_STR            "on_panic"
 55 #define ON_HALT_STR             "on_halt"
 56 #define ON_POFF_STR             "on_poff"
 57 #define ON_REIPL_STR            "on_reboot"
 58 #define ON_RESTART_STR          "on_restart"
 59 
 60 struct shutdown_action;
 61 struct shutdown_trigger {
 62         char *name;
 63         struct shutdown_action *action;
 64 };
 65 
 66 /*
 67  * The following shutdown action types are supported:
 68  */
 69 #define SHUTDOWN_ACTION_IPL_STR         "ipl"
 70 #define SHUTDOWN_ACTION_REIPL_STR       "reipl"
 71 #define SHUTDOWN_ACTION_DUMP_STR        "dump"
 72 #define SHUTDOWN_ACTION_VMCMD_STR       "vmcmd"
 73 #define SHUTDOWN_ACTION_STOP_STR        "stop"
 74 #define SHUTDOWN_ACTION_DUMP_REIPL_STR  "dump_reipl"
 75 
 76 struct shutdown_action {
 77         char *name;
 78         void (*fn) (struct shutdown_trigger *trigger);
 79         int (*init) (void);
 80         int init_rc;
 81 };
 82 
 83 static char *ipl_type_str(enum ipl_type type)
 84 {
 85         switch (type) {
 86         case IPL_TYPE_CCW:
 87                 return IPL_CCW_STR;
 88         case IPL_TYPE_FCP:
 89                 return IPL_FCP_STR;
 90         case IPL_TYPE_FCP_DUMP:
 91                 return IPL_FCP_DUMP_STR;
 92         case IPL_TYPE_NSS:
 93                 return IPL_NSS_STR;
 94         case IPL_TYPE_UNKNOWN:
 95         default:
 96                 return IPL_UNKNOWN_STR;
 97         }
 98 }
 99 
100 enum dump_type {
101         DUMP_TYPE_NONE  = 1,
102         DUMP_TYPE_CCW   = 2,
103         DUMP_TYPE_FCP   = 4,
104 };
105 
106 static char *dump_type_str(enum dump_type type)
107 {
108         switch (type) {
109         case DUMP_TYPE_NONE:
110                 return DUMP_NONE_STR;
111         case DUMP_TYPE_CCW:
112                 return DUMP_CCW_STR;
113         case DUMP_TYPE_FCP:
114                 return DUMP_FCP_STR;
115         default:
116                 return NULL;
117         }
118 }
119 
120 /*
121  * Must be in data section since the bss section
122  * is not cleared when these are accessed.
123  */
124 static u16 ipl_devno __attribute__((__section__(".data"))) = 0;
125 u32 ipl_flags __attribute__((__section__(".data"))) = 0;
126 
127 enum ipl_method {
128         REIPL_METHOD_CCW_CIO,
129         REIPL_METHOD_CCW_DIAG,
130         REIPL_METHOD_CCW_VM,
131         REIPL_METHOD_FCP_RO_DIAG,
132         REIPL_METHOD_FCP_RW_DIAG,
133         REIPL_METHOD_FCP_RO_VM,
134         REIPL_METHOD_FCP_DUMP,
135         REIPL_METHOD_NSS,
136         REIPL_METHOD_NSS_DIAG,
137         REIPL_METHOD_DEFAULT,
138 };
139 
140 enum dump_method {
141         DUMP_METHOD_NONE,
142         DUMP_METHOD_CCW_CIO,
143         DUMP_METHOD_CCW_DIAG,
144         DUMP_METHOD_CCW_VM,
145         DUMP_METHOD_FCP_DIAG,
146 };
147 
148 static int diag308_set_works = 0;
149 
150 static struct ipl_parameter_block ipl_block;
151 
152 static int reipl_capabilities = IPL_TYPE_UNKNOWN;
153 
154 static enum ipl_type reipl_type = IPL_TYPE_UNKNOWN;
155 static enum ipl_method reipl_method = REIPL_METHOD_DEFAULT;
156 static struct ipl_parameter_block *reipl_block_fcp;
157 static struct ipl_parameter_block *reipl_block_ccw;
158 static struct ipl_parameter_block *reipl_block_nss;
159 static struct ipl_parameter_block *reipl_block_actual;
160 
161 static int dump_capabilities = DUMP_TYPE_NONE;
162 static enum dump_type dump_type = DUMP_TYPE_NONE;
163 static enum dump_method dump_method = DUMP_METHOD_NONE;
164 static struct ipl_parameter_block *dump_block_fcp;
165 static struct ipl_parameter_block *dump_block_ccw;
166 
167 static struct sclp_ipl_info sclp_ipl_info;
168 
169 int diag308(unsigned long subcode, void *addr)
170 {
171         register unsigned long _addr asm("") = (unsigned long) addr;
172         register unsigned long _rc asm("1") = 0;
173 
174         asm volatile(
175                 "       diag    %0,%2,0x308\n"
176                 "0:\n"
177                 EX_TABLE(0b,0b)
178                 : "+d" (_addr), "+d" (_rc)
179                 : "d" (subcode) : "cc", "memory");
180         return _rc;
181 }
182 EXPORT_SYMBOL_GPL(diag308);
183 
184 /* SYSFS */
185 
186 #define DEFINE_IPL_ATTR_RO(_prefix, _name, _format, _value)             \
187 static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj,     \
188                 struct kobj_attribute *attr,                            \
189                 char *page)                                             \
190 {                                                                       \
191         return sprintf(page, _format, _value);                          \
192 }                                                                       \
193 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
194         __ATTR(_name, S_IRUGO, sys_##_prefix##_##_name##_show, NULL);
195 
196 #define DEFINE_IPL_ATTR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)   \
197 static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj,     \
198                 struct kobj_attribute *attr,                            \
199                 char *page)                                             \
200 {                                                                       \
201         return sprintf(page, _fmt_out,                                  \
202                         (unsigned long long) _value);                   \
203 }                                                                       \
204 static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,    \
205                 struct kobj_attribute *attr,                            \
206                 const char *buf, size_t len)                            \
207 {                                                                       \
208         unsigned long long value;                                       \
209         if (sscanf(buf, _fmt_in, &value) != 1)                          \
210                 return -EINVAL;                                         \
211         _value = value;                                                 \
212         return len;                                                     \
213 }                                                                       \
214 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
215         __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
216                         sys_##_prefix##_##_name##_show,                 \
217                         sys_##_prefix##_##_name##_store);
218 
219 #define DEFINE_IPL_ATTR_STR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)\
220 static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj,     \
221                 struct kobj_attribute *attr,                            \
222                 char *page)                                             \
223 {                                                                       \
224         return sprintf(page, _fmt_out, _value);                         \
225 }                                                                       \
226 static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,    \
227                 struct kobj_attribute *attr,                            \
228                 const char *buf, size_t len)                            \
229 {                                                                       \
230         strncpy(_value, buf, sizeof(_value) - 1);                       \
231         strim(_value);                                                  \
232         return len;                                                     \
233 }                                                                       \
234 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
235         __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
236                         sys_##_prefix##_##_name##_show,                 \
237                         sys_##_prefix##_##_name##_store);
238 
239 static void make_attrs_ro(struct attribute **attrs)
240 {
241         while (*attrs) {
242                 (*attrs)->mode = S_IRUGO;
243                 attrs++;
244         }
245 }
246 
247 /*
248  * ipl section
249  */
250 
251 static __init enum ipl_type get_ipl_type(void)
252 {
253         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
254 
255         if (ipl_flags & IPL_NSS_VALID)
256                 return IPL_TYPE_NSS;
257         if (!(ipl_flags & IPL_DEVNO_VALID))
258                 return IPL_TYPE_UNKNOWN;
259         if (!(ipl_flags & IPL_PARMBLOCK_VALID))
260                 return IPL_TYPE_CCW;
261         if (ipl->hdr.version > IPL_MAX_SUPPORTED_VERSION)
262                 return IPL_TYPE_UNKNOWN;
263         if (ipl->hdr.pbt != DIAG308_IPL_TYPE_FCP)
264                 return IPL_TYPE_UNKNOWN;
265         if (ipl->ipl_info.fcp.opt == DIAG308_IPL_OPT_DUMP)
266                 return IPL_TYPE_FCP_DUMP;
267         return IPL_TYPE_FCP;
268 }
269 
270 struct ipl_info ipl_info;
271 EXPORT_SYMBOL_GPL(ipl_info);
272 
273 static ssize_t ipl_type_show(struct kobject *kobj, struct kobj_attribute *attr,
274                              char *page)
275 {
276         return sprintf(page, "%s\n", ipl_type_str(ipl_info.type));
277 }
278 
279 static struct kobj_attribute sys_ipl_type_attr = __ATTR_RO(ipl_type);
280 
281 /* VM IPL PARM routines */
282 static size_t reipl_get_ascii_vmparm(char *dest, size_t size,
283                                      const struct ipl_parameter_block *ipb)
284 {
285         int i;
286         size_t len;
287         char has_lowercase = 0;
288 
289         len = 0;
290         if ((ipb->ipl_info.ccw.vm_flags & DIAG308_VM_FLAGS_VP_VALID) &&
291             (ipb->ipl_info.ccw.vm_parm_len > 0)) {
292 
293                 len = min_t(size_t, size - 1, ipb->ipl_info.ccw.vm_parm_len);
294                 memcpy(dest, ipb->ipl_info.ccw.vm_parm, len);
295                 /* If at least one character is lowercase, we assume mixed
296                  * case; otherwise we convert everything to lowercase.
297                  */
298                 for (i = 0; i < len; i++)
299                         if ((dest[i] > 0x80 && dest[i] < 0x8a) || /* a-i */
300                             (dest[i] > 0x90 && dest[i] < 0x9a) || /* j-r */
301                             (dest[i] > 0xa1 && dest[i] < 0xaa)) { /* s-z */
302                                 has_lowercase = 1;
303                                 break;
304                         }
305                 if (!has_lowercase)
306                         EBC_TOLOWER(dest, len);
307                 EBCASC(dest, len);
308         }
309         dest[len] = 0;
310 
311         return len;
312 }
313 
314 size_t append_ipl_vmparm(char *dest, size_t size)
315 {
316         size_t rc;
317 
318         rc = 0;
319         if (diag308_set_works && (ipl_block.hdr.pbt == DIAG308_IPL_TYPE_CCW))
320                 rc = reipl_get_ascii_vmparm(dest, size, &ipl_block);
321         else
322                 dest[0] = 0;
323         return rc;
324 }
325 
326 static ssize_t ipl_vm_parm_show(struct kobject *kobj,
327                                 struct kobj_attribute *attr, char *page)
328 {
329         char parm[DIAG308_VMPARM_SIZE + 1] = {};
330 
331         append_ipl_vmparm(parm, sizeof(parm));
332         return sprintf(page, "%s\n", parm);
333 }
334 
335 static size_t scpdata_length(const char* buf, size_t count)
336 {
337         while (count) {
338                 if (buf[count - 1] != '\0' && buf[count - 1] != ' ')
339                         break;
340                 count--;
341         }
342         return count;
343 }
344 
345 static size_t reipl_append_ascii_scpdata(char *dest, size_t size,
346                                          const struct ipl_parameter_block *ipb)
347 {
348         size_t count;
349         size_t i;
350         int has_lowercase;
351 
352         count = min(size - 1, scpdata_length(ipb->ipl_info.fcp.scp_data,
353                                              ipb->ipl_info.fcp.scp_data_len));
354         if (!count)
355                 goto out;
356 
357         has_lowercase = 0;
358         for (i = 0; i < count; i++) {
359                 if (!isascii(ipb->ipl_info.fcp.scp_data[i])) {
360                         count = 0;
361                         goto out;
362                 }
363                 if (!has_lowercase && islower(ipb->ipl_info.fcp.scp_data[i]))
364                         has_lowercase = 1;
365         }
366 
367         if (has_lowercase)
368                 memcpy(dest, ipb->ipl_info.fcp.scp_data, count);
369         else
370                 for (i = 0; i < count; i++)
371                         dest[i] = tolower(ipb->ipl_info.fcp.scp_data[i]);
372 out:
373         dest[count] = '\0';
374         return count;
375 }
376 
377 size_t append_ipl_scpdata(char *dest, size_t len)
378 {
379         size_t rc;
380 
381         rc = 0;
382         if (ipl_block.hdr.pbt == DIAG308_IPL_TYPE_FCP)
383                 rc = reipl_append_ascii_scpdata(dest, len, &ipl_block);
384         else
385                 dest[0] = 0;
386         return rc;
387 }
388 
389 
390 static struct kobj_attribute sys_ipl_vm_parm_attr =
391         __ATTR(parm, S_IRUGO, ipl_vm_parm_show, NULL);
392 
393 static ssize_t sys_ipl_device_show(struct kobject *kobj,
394                                    struct kobj_attribute *attr, char *page)
395 {
396         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
397 
398         switch (ipl_info.type) {
399         case IPL_TYPE_CCW:
400                 return sprintf(page, "0.0.%04x\n", ipl_devno);
401         case IPL_TYPE_FCP:
402         case IPL_TYPE_FCP_DUMP:
403                 return sprintf(page, "0.0.%04x\n", ipl->ipl_info.fcp.devno);
404         default:
405                 return 0;
406         }
407 }
408 
409 static struct kobj_attribute sys_ipl_device_attr =
410         __ATTR(device, S_IRUGO, sys_ipl_device_show, NULL);
411 
412 static ssize_t ipl_parameter_read(struct file *filp, struct kobject *kobj,
413                                   struct bin_attribute *attr, char *buf,
414                                   loff_t off, size_t count)
415 {
416         return memory_read_from_buffer(buf, count, &off, IPL_PARMBLOCK_START,
417                                         IPL_PARMBLOCK_SIZE);
418 }
419 
420 static struct bin_attribute ipl_parameter_attr = {
421         .attr = {
422                 .name = "binary_parameter",
423                 .mode = S_IRUGO,
424         },
425         .size = PAGE_SIZE,
426         .read = &ipl_parameter_read,
427 };
428 
429 static ssize_t ipl_scp_data_read(struct file *filp, struct kobject *kobj,
430                                  struct bin_attribute *attr, char *buf,
431                                  loff_t off, size_t count)
432 {
433         unsigned int size = IPL_PARMBLOCK_START->ipl_info.fcp.scp_data_len;
434         void *scp_data = &IPL_PARMBLOCK_START->ipl_info.fcp.scp_data;
435 
436         return memory_read_from_buffer(buf, count, &off, scp_data, size);
437 }
438 
439 static struct bin_attribute ipl_scp_data_attr = {
440         .attr = {
441                 .name = "scp_data",
442                 .mode = S_IRUGO,
443         },
444         .size = PAGE_SIZE,
445         .read = ipl_scp_data_read,
446 };
447 
448 /* FCP ipl device attributes */
449 
450 DEFINE_IPL_ATTR_RO(ipl_fcp, wwpn, "0x%016llx\n", (unsigned long long)
451                    IPL_PARMBLOCK_START->ipl_info.fcp.wwpn);
452 DEFINE_IPL_ATTR_RO(ipl_fcp, lun, "0x%016llx\n", (unsigned long long)
453                    IPL_PARMBLOCK_START->ipl_info.fcp.lun);
454 DEFINE_IPL_ATTR_RO(ipl_fcp, bootprog, "%lld\n", (unsigned long long)
455                    IPL_PARMBLOCK_START->ipl_info.fcp.bootprog);
456 DEFINE_IPL_ATTR_RO(ipl_fcp, br_lba, "%lld\n", (unsigned long long)
457                    IPL_PARMBLOCK_START->ipl_info.fcp.br_lba);
458 
459 static struct attribute *ipl_fcp_attrs[] = {
460         &sys_ipl_type_attr.attr,
461         &sys_ipl_device_attr.attr,
462         &sys_ipl_fcp_wwpn_attr.attr,
463         &sys_ipl_fcp_lun_attr.attr,
464         &sys_ipl_fcp_bootprog_attr.attr,
465         &sys_ipl_fcp_br_lba_attr.attr,
466         NULL,
467 };
468 
469 static struct attribute_group ipl_fcp_attr_group = {
470         .attrs = ipl_fcp_attrs,
471 };
472 
473 /* CCW ipl device attributes */
474 
475 static ssize_t ipl_ccw_loadparm_show(struct kobject *kobj,
476                                      struct kobj_attribute *attr, char *page)
477 {
478         char loadparm[LOADPARM_LEN + 1] = {};
479 
480         if (!sclp_ipl_info.is_valid)
481                 return sprintf(page, "#unknown#\n");
482         memcpy(loadparm, &sclp_ipl_info.loadparm, LOADPARM_LEN);
483         EBCASC(loadparm, LOADPARM_LEN);
484         strim(loadparm);
485         return sprintf(page, "%s\n", loadparm);
486 }
487 
488 static struct kobj_attribute sys_ipl_ccw_loadparm_attr =
489         __ATTR(loadparm, 0444, ipl_ccw_loadparm_show, NULL);
490 
491 static struct attribute *ipl_ccw_attrs_vm[] = {
492         &sys_ipl_type_attr.attr,
493         &sys_ipl_device_attr.attr,
494         &sys_ipl_ccw_loadparm_attr.attr,
495         &sys_ipl_vm_parm_attr.attr,
496         NULL,
497 };
498 
499 static struct attribute *ipl_ccw_attrs_lpar[] = {
500         &sys_ipl_type_attr.attr,
501         &sys_ipl_device_attr.attr,
502         &sys_ipl_ccw_loadparm_attr.attr,
503         NULL,
504 };
505 
506 static struct attribute_group ipl_ccw_attr_group_vm = {
507         .attrs = ipl_ccw_attrs_vm,
508 };
509 
510 static struct attribute_group ipl_ccw_attr_group_lpar = {
511         .attrs = ipl_ccw_attrs_lpar
512 };
513 
514 /* NSS ipl device attributes */
515 
516 DEFINE_IPL_ATTR_RO(ipl_nss, name, "%s\n", kernel_nss_name);
517 
518 static struct attribute *ipl_nss_attrs[] = {
519         &sys_ipl_type_attr.attr,
520         &sys_ipl_nss_name_attr.attr,
521         &sys_ipl_ccw_loadparm_attr.attr,
522         &sys_ipl_vm_parm_attr.attr,
523         NULL,
524 };
525 
526 static struct attribute_group ipl_nss_attr_group = {
527         .attrs = ipl_nss_attrs,
528 };
529 
530 /* UNKNOWN ipl device attributes */
531 
532 static struct attribute *ipl_unknown_attrs[] = {
533         &sys_ipl_type_attr.attr,
534         NULL,
535 };
536 
537 static struct attribute_group ipl_unknown_attr_group = {
538         .attrs = ipl_unknown_attrs,
539 };
540 
541 static struct kset *ipl_kset;
542 
543 static int __init ipl_register_fcp_files(void)
544 {
545         int rc;
546 
547         rc = sysfs_create_group(&ipl_kset->kobj, &ipl_fcp_attr_group);
548         if (rc)
549                 goto out;
550         rc = sysfs_create_bin_file(&ipl_kset->kobj, &ipl_parameter_attr);
551         if (rc)
552                 goto out_ipl_parm;
553         rc = sysfs_create_bin_file(&ipl_kset->kobj, &ipl_scp_data_attr);
554         if (!rc)
555                 goto out;
556 
557         sysfs_remove_bin_file(&ipl_kset->kobj, &ipl_parameter_attr);
558 
559 out_ipl_parm:
560         sysfs_remove_group(&ipl_kset->kobj, &ipl_fcp_attr_group);
561 out:
562         return rc;
563 }
564 
565 static void __ipl_run(void *unused)
566 {
567         diag308(DIAG308_IPL, NULL);
568         if (MACHINE_IS_VM)
569                 __cpcmd("IPL", NULL, 0, NULL);
570         else if (ipl_info.type == IPL_TYPE_CCW)
571                 reipl_ccw_dev(&ipl_info.data.ccw.dev_id);
572 }
573 
574 static void ipl_run(struct shutdown_trigger *trigger)
575 {
576         smp_call_ipl_cpu(__ipl_run, NULL);
577 }
578 
579 static int __init ipl_init(void)
580 {
581         int rc;
582 
583         ipl_kset = kset_create_and_add("ipl", NULL, firmware_kobj);
584         if (!ipl_kset) {
585                 rc = -ENOMEM;
586                 goto out;
587         }
588         switch (ipl_info.type) {
589         case IPL_TYPE_CCW:
590                 if (MACHINE_IS_VM)
591                         rc = sysfs_create_group(&ipl_kset->kobj,
592                                                 &ipl_ccw_attr_group_vm);
593                 else
594                         rc = sysfs_create_group(&ipl_kset->kobj,
595                                                 &ipl_ccw_attr_group_lpar);
596                 break;
597         case IPL_TYPE_FCP:
598         case IPL_TYPE_FCP_DUMP:
599                 rc = ipl_register_fcp_files();
600                 break;
601         case IPL_TYPE_NSS:
602                 rc = sysfs_create_group(&ipl_kset->kobj, &ipl_nss_attr_group);
603                 break;
604         default:
605                 rc = sysfs_create_group(&ipl_kset->kobj,
606                                         &ipl_unknown_attr_group);
607                 break;
608         }
609 out:
610         if (rc)
611                 panic("ipl_init failed: rc = %i\n", rc);
612 
613         return 0;
614 }
615 
616 static struct shutdown_action __refdata ipl_action = {
617         .name   = SHUTDOWN_ACTION_IPL_STR,
618         .fn     = ipl_run,
619         .init   = ipl_init,
620 };
621 
622 /*
623  * reipl shutdown action: Reboot Linux on shutdown.
624  */
625 
626 /* VM IPL PARM attributes */
627 static ssize_t reipl_generic_vmparm_show(struct ipl_parameter_block *ipb,
628                                           char *page)
629 {
630         char vmparm[DIAG308_VMPARM_SIZE + 1] = {};
631 
632         reipl_get_ascii_vmparm(vmparm, sizeof(vmparm), ipb);
633         return sprintf(page, "%s\n", vmparm);
634 }
635 
636 static ssize_t reipl_generic_vmparm_store(struct ipl_parameter_block *ipb,
637                                           size_t vmparm_max,
638                                           const char *buf, size_t len)
639 {
640         int i, ip_len;
641 
642         /* ignore trailing newline */
643         ip_len = len;
644         if ((len > 0) && (buf[len - 1] == '\n'))
645                 ip_len--;
646 
647         if (ip_len > vmparm_max)
648                 return -EINVAL;
649 
650         /* parm is used to store kernel options, check for common chars */
651         for (i = 0; i < ip_len; i++)
652                 if (!(isalnum(buf[i]) || isascii(buf[i]) || isprint(buf[i])))
653                         return -EINVAL;
654 
655         memset(ipb->ipl_info.ccw.vm_parm, 0, DIAG308_VMPARM_SIZE);
656         ipb->ipl_info.ccw.vm_parm_len = ip_len;
657         if (ip_len > 0) {
658                 ipb->ipl_info.ccw.vm_flags |= DIAG308_VM_FLAGS_VP_VALID;
659                 memcpy(ipb->ipl_info.ccw.vm_parm, buf, ip_len);
660                 ASCEBC(ipb->ipl_info.ccw.vm_parm, ip_len);
661         } else {
662                 ipb->ipl_info.ccw.vm_flags &= ~DIAG308_VM_FLAGS_VP_VALID;
663         }
664 
665         return len;
666 }
667 
668 /* NSS wrapper */
669 static ssize_t reipl_nss_vmparm_show(struct kobject *kobj,
670                                      struct kobj_attribute *attr, char *page)
671 {
672         return reipl_generic_vmparm_show(reipl_block_nss, page);
673 }
674 
675 static ssize_t reipl_nss_vmparm_store(struct kobject *kobj,
676                                       struct kobj_attribute *attr,
677                                       const char *buf, size_t len)
678 {
679         return reipl_generic_vmparm_store(reipl_block_nss, 56, buf, len);
680 }
681 
682 /* CCW wrapper */
683 static ssize_t reipl_ccw_vmparm_show(struct kobject *kobj,
684                                      struct kobj_attribute *attr, char *page)
685 {
686         return reipl_generic_vmparm_show(reipl_block_ccw, page);
687 }
688 
689 static ssize_t reipl_ccw_vmparm_store(struct kobject *kobj,
690                                       struct kobj_attribute *attr,
691                                       const char *buf, size_t len)
692 {
693         return reipl_generic_vmparm_store(reipl_block_ccw, 64, buf, len);
694 }
695 
696 static struct kobj_attribute sys_reipl_nss_vmparm_attr =
697         __ATTR(parm, S_IRUGO | S_IWUSR, reipl_nss_vmparm_show,
698                                         reipl_nss_vmparm_store);
699 static struct kobj_attribute sys_reipl_ccw_vmparm_attr =
700         __ATTR(parm, S_IRUGO | S_IWUSR, reipl_ccw_vmparm_show,
701                                         reipl_ccw_vmparm_store);
702 
703 /* FCP reipl device attributes */
704 
705 static ssize_t reipl_fcp_scpdata_read(struct file *filp, struct kobject *kobj,
706                                       struct bin_attribute *attr,
707                                       char *buf, loff_t off, size_t count)
708 {
709         size_t size = reipl_block_fcp->ipl_info.fcp.scp_data_len;
710         void *scp_data = reipl_block_fcp->ipl_info.fcp.scp_data;
711 
712         return memory_read_from_buffer(buf, count, &off, scp_data, size);
713 }
714 
715 static ssize_t reipl_fcp_scpdata_write(struct file *filp, struct kobject *kobj,
716                                        struct bin_attribute *attr,
717                                        char *buf, loff_t off, size_t count)
718 {
719         size_t padding;
720         size_t scpdata_len;
721 
722         if (off < 0)
723                 return -EINVAL;
724 
725         if (off >= DIAG308_SCPDATA_SIZE)
726                 return -ENOSPC;
727 
728         if (count > DIAG308_SCPDATA_SIZE - off)
729                 count = DIAG308_SCPDATA_SIZE - off;
730 
731         memcpy(reipl_block_fcp->ipl_info.fcp.scp_data, buf + off, count);
732         scpdata_len = off + count;
733 
734         if (scpdata_len % 8) {
735                 padding = 8 - (scpdata_len % 8);
736                 memset(reipl_block_fcp->ipl_info.fcp.scp_data + scpdata_len,
737                        0, padding);
738                 scpdata_len += padding;
739         }
740 
741         reipl_block_fcp->ipl_info.fcp.scp_data_len = scpdata_len;
742         reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN + scpdata_len;
743         reipl_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN + scpdata_len;
744 
745         return count;
746 }
747 
748 static struct bin_attribute sys_reipl_fcp_scp_data_attr = {
749         .attr = {
750                 .name = "scp_data",
751                 .mode = S_IRUGO | S_IWUSR,
752         },
753         .size = PAGE_SIZE,
754         .read = reipl_fcp_scpdata_read,
755         .write = reipl_fcp_scpdata_write,
756 };
757 
758 DEFINE_IPL_ATTR_RW(reipl_fcp, wwpn, "0x%016llx\n", "%016llx\n",
759                    reipl_block_fcp->ipl_info.fcp.wwpn);
760 DEFINE_IPL_ATTR_RW(reipl_fcp, lun, "0x%016llx\n", "%016llx\n",
761                    reipl_block_fcp->ipl_info.fcp.lun);
762 DEFINE_IPL_ATTR_RW(reipl_fcp, bootprog, "%lld\n", "%lld\n",
763                    reipl_block_fcp->ipl_info.fcp.bootprog);
764 DEFINE_IPL_ATTR_RW(reipl_fcp, br_lba, "%lld\n", "%lld\n",
765                    reipl_block_fcp->ipl_info.fcp.br_lba);
766 DEFINE_IPL_ATTR_RW(reipl_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
767                    reipl_block_fcp->ipl_info.fcp.devno);
768 
769 static struct attribute *reipl_fcp_attrs[] = {
770         &sys_reipl_fcp_device_attr.attr,
771         &sys_reipl_fcp_wwpn_attr.attr,
772         &sys_reipl_fcp_lun_attr.attr,
773         &sys_reipl_fcp_bootprog_attr.attr,
774         &sys_reipl_fcp_br_lba_attr.attr,
775         NULL,
776 };
777 
778 static struct attribute_group reipl_fcp_attr_group = {
779         .attrs = reipl_fcp_attrs,
780 };
781 
782 /* CCW reipl device attributes */
783 
784 DEFINE_IPL_ATTR_RW(reipl_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
785         reipl_block_ccw->ipl_info.ccw.devno);
786 
787 static void reipl_get_ascii_loadparm(char *loadparm,
788                                      struct ipl_parameter_block *ibp)
789 {
790         memcpy(loadparm, ibp->ipl_info.ccw.load_parm, LOADPARM_LEN);
791         EBCASC(loadparm, LOADPARM_LEN);
792         loadparm[LOADPARM_LEN] = 0;
793         strim(loadparm);
794 }
795 
796 static ssize_t reipl_generic_loadparm_show(struct ipl_parameter_block *ipb,
797                                            char *page)
798 {
799         char buf[LOADPARM_LEN + 1];
800 
801         reipl_get_ascii_loadparm(buf, ipb);
802         return sprintf(page, "%s\n", buf);
803 }
804 
805 static ssize_t reipl_generic_loadparm_store(struct ipl_parameter_block *ipb,
806                                             const char *buf, size_t len)
807 {
808         int i, lp_len;
809 
810         /* ignore trailing newline */
811         lp_len = len;
812         if ((len > 0) && (buf[len - 1] == '\n'))
813                 lp_len--;
814         /* loadparm can have max 8 characters and must not start with a blank */
815         if ((lp_len > LOADPARM_LEN) || ((lp_len > 0) && (buf[0] == ' ')))
816                 return -EINVAL;
817         /* loadparm can only contain "a-z,A-Z,0-9,SP,." */
818         for (i = 0; i < lp_len; i++) {
819                 if (isalpha(buf[i]) || isdigit(buf[i]) || (buf[i] == ' ') ||
820                     (buf[i] == '.'))
821                         continue;
822                 return -EINVAL;
823         }
824         /* initialize loadparm with blanks */
825         memset(ipb->ipl_info.ccw.load_parm, ' ', LOADPARM_LEN);
826         /* copy and convert to ebcdic */
827         memcpy(ipb->ipl_info.ccw.load_parm, buf, lp_len);
828         ASCEBC(ipb->ipl_info.ccw.load_parm, LOADPARM_LEN);
829         return len;
830 }
831 
832 /* NSS wrapper */
833 static ssize_t reipl_nss_loadparm_show(struct kobject *kobj,
834                                        struct kobj_attribute *attr, char *page)
835 {
836         return reipl_generic_loadparm_show(reipl_block_nss, page);
837 }
838 
839 static ssize_t reipl_nss_loadparm_store(struct kobject *kobj,
840                                         struct kobj_attribute *attr,
841                                         const char *buf, size_t len)
842 {
843         return reipl_generic_loadparm_store(reipl_block_nss, buf, len);
844 }
845 
846 /* CCW wrapper */
847 static ssize_t reipl_ccw_loadparm_show(struct kobject *kobj,
848                                        struct kobj_attribute *attr, char *page)
849 {
850         return reipl_generic_loadparm_show(reipl_block_ccw, page);
851 }
852 
853 static ssize_t reipl_ccw_loadparm_store(struct kobject *kobj,
854                                         struct kobj_attribute *attr,
855                                         const char *buf, size_t len)
856 {
857         return reipl_generic_loadparm_store(reipl_block_ccw, buf, len);
858 }
859 
860 static struct kobj_attribute sys_reipl_ccw_loadparm_attr =
861         __ATTR(loadparm, S_IRUGO | S_IWUSR, reipl_ccw_loadparm_show,
862                                             reipl_ccw_loadparm_store);
863 
864 static struct attribute *reipl_ccw_attrs_vm[] = {
865         &sys_reipl_ccw_device_attr.attr,
866         &sys_reipl_ccw_loadparm_attr.attr,
867         &sys_reipl_ccw_vmparm_attr.attr,
868         NULL,
869 };
870 
871 static struct attribute *reipl_ccw_attrs_lpar[] = {
872         &sys_reipl_ccw_device_attr.attr,
873         &sys_reipl_ccw_loadparm_attr.attr,
874         NULL,
875 };
876 
877 static struct attribute_group reipl_ccw_attr_group_vm = {
878         .name  = IPL_CCW_STR,
879         .attrs = reipl_ccw_attrs_vm,
880 };
881 
882 static struct attribute_group reipl_ccw_attr_group_lpar = {
883         .name  = IPL_CCW_STR,
884         .attrs = reipl_ccw_attrs_lpar,
885 };
886 
887 
888 /* NSS reipl device attributes */
889 static void reipl_get_ascii_nss_name(char *dst,
890                                      struct ipl_parameter_block *ipb)
891 {
892         memcpy(dst, ipb->ipl_info.ccw.nss_name, NSS_NAME_SIZE);
893         EBCASC(dst, NSS_NAME_SIZE);
894         dst[NSS_NAME_SIZE] = 0;
895 }
896 
897 static ssize_t reipl_nss_name_show(struct kobject *kobj,
898                                    struct kobj_attribute *attr, char *page)
899 {
900         char nss_name[NSS_NAME_SIZE + 1] = {};
901 
902         reipl_get_ascii_nss_name(nss_name, reipl_block_nss);
903         return sprintf(page, "%s\n", nss_name);
904 }
905 
906 static ssize_t reipl_nss_name_store(struct kobject *kobj,
907                                     struct kobj_attribute *attr,
908                                     const char *buf, size_t len)
909 {
910         int nss_len;
911 
912         /* ignore trailing newline */
913         nss_len = len;
914         if ((len > 0) && (buf[len - 1] == '\n'))
915                 nss_len--;
916 
917         if (nss_len > NSS_NAME_SIZE)
918                 return -EINVAL;
919 
920         memset(reipl_block_nss->ipl_info.ccw.nss_name, 0x40, NSS_NAME_SIZE);
921         if (nss_len > 0) {
922                 reipl_block_nss->ipl_info.ccw.vm_flags |=
923                         DIAG308_VM_FLAGS_NSS_VALID;
924                 memcpy(reipl_block_nss->ipl_info.ccw.nss_name, buf, nss_len);
925                 ASCEBC(reipl_block_nss->ipl_info.ccw.nss_name, nss_len);
926                 EBC_TOUPPER(reipl_block_nss->ipl_info.ccw.nss_name, nss_len);
927         } else {
928                 reipl_block_nss->ipl_info.ccw.vm_flags &=
929                         ~DIAG308_VM_FLAGS_NSS_VALID;
930         }
931 
932         return len;
933 }
934 
935 static struct kobj_attribute sys_reipl_nss_name_attr =
936         __ATTR(name, S_IRUGO | S_IWUSR, reipl_nss_name_show,
937                                         reipl_nss_name_store);
938 
939 static struct kobj_attribute sys_reipl_nss_loadparm_attr =
940         __ATTR(loadparm, S_IRUGO | S_IWUSR, reipl_nss_loadparm_show,
941                                             reipl_nss_loadparm_store);
942 
943 static struct attribute *reipl_nss_attrs[] = {
944         &sys_reipl_nss_name_attr.attr,
945         &sys_reipl_nss_loadparm_attr.attr,
946         &sys_reipl_nss_vmparm_attr.attr,
947         NULL,
948 };
949 
950 static struct attribute_group reipl_nss_attr_group = {
951         .name  = IPL_NSS_STR,
952         .attrs = reipl_nss_attrs,
953 };
954 
955 static void set_reipl_block_actual(struct ipl_parameter_block *reipl_block)
956 {
957         reipl_block_actual = reipl_block;
958         os_info_entry_add(OS_INFO_REIPL_BLOCK, reipl_block_actual,
959                           reipl_block->hdr.len);
960 }
961 
962 /* reipl type */
963 
964 static int reipl_set_type(enum ipl_type type)
965 {
966         if (!(reipl_capabilities & type))
967                 return -EINVAL;
968 
969         switch(type) {
970         case IPL_TYPE_CCW:
971                 if (diag308_set_works)
972                         reipl_method = REIPL_METHOD_CCW_DIAG;
973                 else if (MACHINE_IS_VM)
974                         reipl_method = REIPL_METHOD_CCW_VM;
975                 else
976                         reipl_method = REIPL_METHOD_CCW_CIO;
977                 set_reipl_block_actual(reipl_block_ccw);
978                 break;
979         case IPL_TYPE_FCP:
980                 if (diag308_set_works)
981                         reipl_method = REIPL_METHOD_FCP_RW_DIAG;
982                 else if (MACHINE_IS_VM)
983                         reipl_method = REIPL_METHOD_FCP_RO_VM;
984                 else
985                         reipl_method = REIPL_METHOD_FCP_RO_DIAG;
986                 set_reipl_block_actual(reipl_block_fcp);
987                 break;
988         case IPL_TYPE_FCP_DUMP:
989                 reipl_method = REIPL_METHOD_FCP_DUMP;
990                 break;
991         case IPL_TYPE_NSS:
992                 if (diag308_set_works)
993                         reipl_method = REIPL_METHOD_NSS_DIAG;
994                 else
995                         reipl_method = REIPL_METHOD_NSS;
996                 set_reipl_block_actual(reipl_block_nss);
997                 break;
998         case IPL_TYPE_UNKNOWN:
999                 reipl_method = REIPL_METHOD_DEFAULT;
1000                 break;
1001         default:
1002                 BUG();
1003         }
1004         reipl_type = type;
1005         return 0;
1006 }
1007 
1008 static ssize_t reipl_type_show(struct kobject *kobj,
1009                                struct kobj_attribute *attr, char *page)
1010 {
1011         return sprintf(page, "%s\n", ipl_type_str(reipl_type));
1012 }
1013 
1014 static ssize_t reipl_type_store(struct kobject *kobj,
1015                                 struct kobj_attribute *attr,
1016                                 const char *buf, size_t len)
1017 {
1018         int rc = -EINVAL;
1019 
1020         if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
1021                 rc = reipl_set_type(IPL_TYPE_CCW);
1022         else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
1023                 rc = reipl_set_type(IPL_TYPE_FCP);
1024         else if (strncmp(buf, IPL_NSS_STR, strlen(IPL_NSS_STR)) == 0)
1025                 rc = reipl_set_type(IPL_TYPE_NSS);
1026         return (rc != 0) ? rc : len;
1027 }
1028 
1029 static struct kobj_attribute reipl_type_attr =
1030         __ATTR(reipl_type, 0644, reipl_type_show, reipl_type_store);
1031 
1032 static struct kset *reipl_kset;
1033 static struct kset *reipl_fcp_kset;
1034 
1035 static void get_ipl_string(char *dst, struct ipl_parameter_block *ipb,
1036                            const enum ipl_method m)
1037 {
1038         char loadparm[LOADPARM_LEN + 1] = {};
1039         char vmparm[DIAG308_VMPARM_SIZE + 1] = {};
1040         char nss_name[NSS_NAME_SIZE + 1] = {};
1041         size_t pos = 0;
1042 
1043         reipl_get_ascii_loadparm(loadparm, ipb);
1044         reipl_get_ascii_nss_name(nss_name, ipb);
1045         reipl_get_ascii_vmparm(vmparm, sizeof(vmparm), ipb);
1046 
1047         switch (m) {
1048         case REIPL_METHOD_CCW_VM:
1049                 pos = sprintf(dst, "IPL %X CLEAR", ipb->ipl_info.ccw.devno);
1050                 break;
1051         case REIPL_METHOD_NSS:
1052                 pos = sprintf(dst, "IPL %s", nss_name);
1053                 break;
1054         default:
1055                 break;
1056         }
1057         if (strlen(loadparm) > 0)
1058                 pos += sprintf(dst + pos, " LOADPARM '%s'", loadparm);
1059         if (strlen(vmparm) > 0)
1060                 sprintf(dst + pos, " PARM %s", vmparm);
1061 }
1062 
1063 static void __reipl_run(void *unused)
1064 {
1065         struct ccw_dev_id devid;
1066         static char buf[128];
1067 
1068         switch (reipl_method) {
1069         case REIPL_METHOD_CCW_CIO:
1070                 devid.devno = reipl_block_ccw->ipl_info.ccw.devno;
1071                 devid.ssid  = 0;
1072                 reipl_ccw_dev(&devid);
1073                 break;
1074         case REIPL_METHOD_CCW_VM:
1075                 get_ipl_string(buf, reipl_block_ccw, REIPL_METHOD_CCW_VM);
1076                 __cpcmd(buf, NULL, 0, NULL);
1077                 break;
1078         case REIPL_METHOD_CCW_DIAG:
1079                 diag308(DIAG308_SET, reipl_block_ccw);
1080                 diag308(DIAG308_IPL, NULL);
1081                 break;
1082         case REIPL_METHOD_FCP_RW_DIAG:
1083                 diag308(DIAG308_SET, reipl_block_fcp);
1084                 diag308(DIAG308_IPL, NULL);
1085                 break;
1086         case REIPL_METHOD_FCP_RO_DIAG:
1087                 diag308(DIAG308_IPL, NULL);
1088                 break;
1089         case REIPL_METHOD_FCP_RO_VM:
1090                 __cpcmd("IPL", NULL, 0, NULL);
1091                 break;
1092         case REIPL_METHOD_NSS_DIAG:
1093                 diag308(DIAG308_SET, reipl_block_nss);
1094                 diag308(DIAG308_IPL, NULL);
1095                 break;
1096         case REIPL_METHOD_NSS:
1097                 get_ipl_string(buf, reipl_block_nss, REIPL_METHOD_NSS);
1098                 __cpcmd(buf, NULL, 0, NULL);
1099                 break;
1100         case REIPL_METHOD_DEFAULT:
1101                 if (MACHINE_IS_VM)
1102                         __cpcmd("IPL", NULL, 0, NULL);
1103                 diag308(DIAG308_IPL, NULL);
1104                 break;
1105         case REIPL_METHOD_FCP_DUMP:
1106                 break;
1107         }
1108         disabled_wait((unsigned long) __builtin_return_address(0));
1109 }
1110 
1111 static void reipl_run(struct shutdown_trigger *trigger)
1112 {
1113         smp_call_ipl_cpu(__reipl_run, NULL);
1114 }
1115 
1116 static void reipl_block_ccw_init(struct ipl_parameter_block *ipb)
1117 {
1118         ipb->hdr.len = IPL_PARM_BLK_CCW_LEN;
1119         ipb->hdr.version = IPL_PARM_BLOCK_VERSION;
1120         ipb->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
1121         ipb->hdr.pbt = DIAG308_IPL_TYPE_CCW;
1122 }
1123 
1124 static void reipl_block_ccw_fill_parms(struct ipl_parameter_block *ipb)
1125 {
1126         /* LOADPARM */
1127         /* check if read scp info worked and set loadparm */
1128         if (sclp_ipl_info.is_valid)
1129                 memcpy(ipb->ipl_info.ccw.load_parm,
1130                                 &sclp_ipl_info.loadparm, LOADPARM_LEN);
1131         else
1132                 /* read scp info failed: set empty loadparm (EBCDIC blanks) */
1133                 memset(ipb->ipl_info.ccw.load_parm, 0x40, LOADPARM_LEN);
1134         ipb->hdr.flags = DIAG308_FLAGS_LP_VALID;
1135 
1136         /* VM PARM */
1137         if (MACHINE_IS_VM && diag308_set_works &&
1138             (ipl_block.ipl_info.ccw.vm_flags & DIAG308_VM_FLAGS_VP_VALID)) {
1139 
1140                 ipb->ipl_info.ccw.vm_flags |= DIAG308_VM_FLAGS_VP_VALID;
1141                 ipb->ipl_info.ccw.vm_parm_len =
1142                                         ipl_block.ipl_info.ccw.vm_parm_len;
1143                 memcpy(ipb->ipl_info.ccw.vm_parm,
1144                        ipl_block.ipl_info.ccw.vm_parm, DIAG308_VMPARM_SIZE);
1145         }
1146 }
1147 
1148 static int __init reipl_nss_init(void)
1149 {
1150         int rc;
1151 
1152         if (!MACHINE_IS_VM)
1153                 return 0;
1154 
1155         reipl_block_nss = (void *) get_zeroed_page(GFP_KERNEL);
1156         if (!reipl_block_nss)
1157                 return -ENOMEM;
1158 
1159         if (!diag308_set_works)
1160                 sys_reipl_nss_vmparm_attr.attr.mode = S_IRUGO;
1161 
1162         rc = sysfs_create_group(&reipl_kset->kobj, &reipl_nss_attr_group);
1163         if (rc)
1164                 return rc;
1165 
1166         reipl_block_ccw_init(reipl_block_nss);
1167         if (ipl_info.type == IPL_TYPE_NSS) {
1168                 memset(reipl_block_nss->ipl_info.ccw.nss_name,
1169                         ' ', NSS_NAME_SIZE);
1170                 memcpy(reipl_block_nss->ipl_info.ccw.nss_name,
1171                         kernel_nss_name, strlen(kernel_nss_name));
1172                 ASCEBC(reipl_block_nss->ipl_info.ccw.nss_name, NSS_NAME_SIZE);
1173                 reipl_block_nss->ipl_info.ccw.vm_flags |=
1174                         DIAG308_VM_FLAGS_NSS_VALID;
1175 
1176                 reipl_block_ccw_fill_parms(reipl_block_nss);
1177         }
1178 
1179         reipl_capabilities |= IPL_TYPE_NSS;
1180         return 0;
1181 }
1182 
1183 static int __init reipl_ccw_init(void)
1184 {
1185         int rc;
1186 
1187         reipl_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
1188         if (!reipl_block_ccw)
1189                 return -ENOMEM;
1190 
1191         if (MACHINE_IS_VM) {
1192                 if (!diag308_set_works)
1193                         sys_reipl_ccw_vmparm_attr.attr.mode = S_IRUGO;
1194                 rc = sysfs_create_group(&reipl_kset->kobj,
1195                                         &reipl_ccw_attr_group_vm);
1196         } else {
1197                 if(!diag308_set_works)
1198                         sys_reipl_ccw_loadparm_attr.attr.mode = S_IRUGO;
1199                 rc = sysfs_create_group(&reipl_kset->kobj,
1200                                         &reipl_ccw_attr_group_lpar);
1201         }
1202         if (rc)
1203                 return rc;
1204 
1205         reipl_block_ccw_init(reipl_block_ccw);
1206         if (ipl_info.type == IPL_TYPE_CCW) {
1207                 reipl_block_ccw->ipl_info.ccw.devno = ipl_devno;
1208                 reipl_block_ccw_fill_parms(reipl_block_ccw);
1209         }
1210 
1211         reipl_capabilities |= IPL_TYPE_CCW;
1212         return 0;
1213 }
1214 
1215 static int __init reipl_fcp_init(void)
1216 {
1217         int rc;
1218 
1219         if (!diag308_set_works) {
1220                 if (ipl_info.type == IPL_TYPE_FCP) {
1221                         make_attrs_ro(reipl_fcp_attrs);
1222                         sys_reipl_fcp_scp_data_attr.attr.mode = S_IRUGO;
1223                 } else
1224                         return 0;
1225         }
1226 
1227         reipl_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
1228         if (!reipl_block_fcp)
1229                 return -ENOMEM;
1230 
1231         /* sysfs: create fcp kset for mixing attr group and bin attrs */
1232         reipl_fcp_kset = kset_create_and_add(IPL_FCP_STR, NULL,
1233                                              &reipl_kset->kobj);
1234         if (!reipl_fcp_kset) {
1235                 free_page((unsigned long) reipl_block_fcp);
1236                 return -ENOMEM;
1237         }
1238 
1239         rc = sysfs_create_group(&reipl_fcp_kset->kobj, &reipl_fcp_attr_group);
1240         if (rc) {
1241                 kset_unregister(reipl_fcp_kset);
1242                 free_page((unsigned long) reipl_block_fcp);
1243                 return rc;
1244         }
1245 
1246         rc = sysfs_create_bin_file(&reipl_fcp_kset->kobj,
1247                                    &sys_reipl_fcp_scp_data_attr);
1248         if (rc) {
1249                 sysfs_remove_group(&reipl_fcp_kset->kobj, &reipl_fcp_attr_group);
1250                 kset_unregister(reipl_fcp_kset);
1251                 free_page((unsigned long) reipl_block_fcp);
1252                 return rc;
1253         }
1254 
1255         if (ipl_info.type == IPL_TYPE_FCP)
1256                 memcpy(reipl_block_fcp, IPL_PARMBLOCK_START, PAGE_SIZE);
1257         else {
1258                 reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
1259                 reipl_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
1260                 reipl_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
1261                 reipl_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
1262                 reipl_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_IPL;
1263         }
1264         reipl_capabilities |= IPL_TYPE_FCP;
1265         return 0;
1266 }
1267 
1268 static int __init reipl_type_init(void)
1269 {
1270         enum ipl_type reipl_type = ipl_info.type;
1271         struct ipl_parameter_block *reipl_block;
1272         unsigned long size;
1273 
1274         reipl_block = os_info_old_entry(OS_INFO_REIPL_BLOCK, &size);
1275         if (!reipl_block)
1276                 goto out;
1277         /*
1278          * If we have an OS info reipl block, this will be used
1279          */
1280         if (reipl_block->hdr.pbt == DIAG308_IPL_TYPE_FCP) {
1281                 memcpy(reipl_block_fcp, reipl_block, size);
1282                 reipl_type = IPL_TYPE_FCP;
1283         } else if (reipl_block->hdr.pbt == DIAG308_IPL_TYPE_CCW) {
1284                 memcpy(reipl_block_ccw, reipl_block, size);
1285                 reipl_type = IPL_TYPE_CCW;
1286         }
1287 out:
1288         return reipl_set_type(reipl_type);
1289 }
1290 
1291 static int __init reipl_init(void)
1292 {
1293         int rc;
1294 
1295         reipl_kset = kset_create_and_add("reipl", NULL, firmware_kobj);
1296         if (!reipl_kset)
1297                 return -ENOMEM;
1298         rc = sysfs_create_file(&reipl_kset->kobj, &reipl_type_attr.attr);
1299         if (rc) {
1300                 kset_unregister(reipl_kset);
1301                 return rc;
1302         }
1303         rc = reipl_ccw_init();
1304         if (rc)
1305                 return rc;
1306         rc = reipl_fcp_init();
1307         if (rc)
1308                 return rc;
1309         rc = reipl_nss_init();
1310         if (rc)
1311                 return rc;
1312         return reipl_type_init();
1313 }
1314 
1315 static struct shutdown_action __refdata reipl_action = {
1316         .name   = SHUTDOWN_ACTION_REIPL_STR,
1317         .fn     = reipl_run,
1318         .init   = reipl_init,
1319 };
1320 
1321 /*
1322  * dump shutdown action: Dump Linux on shutdown.
1323  */
1324 
1325 /* FCP dump device attributes */
1326 
1327 DEFINE_IPL_ATTR_RW(dump_fcp, wwpn, "0x%016llx\n", "%016llx\n",
1328                    dump_block_fcp->ipl_info.fcp.wwpn);
1329 DEFINE_IPL_ATTR_RW(dump_fcp, lun, "0x%016llx\n", "%016llx\n",
1330                    dump_block_fcp->ipl_info.fcp.lun);
1331 DEFINE_IPL_ATTR_RW(dump_fcp, bootprog, "%lld\n", "%lld\n",
1332                    dump_block_fcp->ipl_info.fcp.bootprog);
1333 DEFINE_IPL_ATTR_RW(dump_fcp, br_lba, "%lld\n", "%lld\n",
1334                    dump_block_fcp->ipl_info.fcp.br_lba);
1335 DEFINE_IPL_ATTR_RW(dump_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
1336                    dump_block_fcp->ipl_info.fcp.devno);
1337 
1338 static struct attribute *dump_fcp_attrs[] = {
1339         &sys_dump_fcp_device_attr.attr,
1340         &sys_dump_fcp_wwpn_attr.attr,
1341         &sys_dump_fcp_lun_attr.attr,
1342         &sys_dump_fcp_bootprog_attr.attr,
1343         &sys_dump_fcp_br_lba_attr.attr,
1344         NULL,
1345 };
1346 
1347 static struct attribute_group dump_fcp_attr_group = {
1348         .name  = IPL_FCP_STR,
1349         .attrs = dump_fcp_attrs,
1350 };
1351 
1352 /* CCW dump device attributes */
1353 
1354 DEFINE_IPL_ATTR_RW(dump_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
1355                    dump_block_ccw->ipl_info.ccw.devno);
1356 
1357 static struct attribute *dump_ccw_attrs[] = {
1358         &sys_dump_ccw_device_attr.attr,
1359         NULL,
1360 };
1361 
1362 static struct attribute_group dump_ccw_attr_group = {
1363         .name  = IPL_CCW_STR,
1364         .attrs = dump_ccw_attrs,
1365 };
1366 
1367 /* dump type */
1368 
1369 static int dump_set_type(enum dump_type type)
1370 {
1371         if (!(dump_capabilities & type))
1372                 return -EINVAL;
1373         switch (type) {
1374         case DUMP_TYPE_CCW:
1375                 if (diag308_set_works)
1376                         dump_method = DUMP_METHOD_CCW_DIAG;
1377                 else if (MACHINE_IS_VM)
1378                         dump_method = DUMP_METHOD_CCW_VM;
1379                 else
1380                         dump_method = DUMP_METHOD_CCW_CIO;
1381                 break;
1382         case DUMP_TYPE_FCP:
1383                 dump_method = DUMP_METHOD_FCP_DIAG;
1384                 break;
1385         default:
1386                 dump_method = DUMP_METHOD_NONE;
1387         }
1388         dump_type = type;
1389         return 0;
1390 }
1391 
1392 static ssize_t dump_type_show(struct kobject *kobj,
1393                               struct kobj_attribute *attr, char *page)
1394 {
1395         return sprintf(page, "%s\n", dump_type_str(dump_type));
1396 }
1397 
1398 static ssize_t dump_type_store(struct kobject *kobj,
1399                                struct kobj_attribute *attr,
1400                                const char *buf, size_t len)
1401 {
1402         int rc = -EINVAL;
1403 
1404         if (strncmp(buf, DUMP_NONE_STR, strlen(DUMP_NONE_STR)) == 0)
1405                 rc = dump_set_type(DUMP_TYPE_NONE);
1406         else if (strncmp(buf, DUMP_CCW_STR, strlen(DUMP_CCW_STR)) == 0)
1407                 rc = dump_set_type(DUMP_TYPE_CCW);
1408         else if (strncmp(buf, DUMP_FCP_STR, strlen(DUMP_FCP_STR)) == 0)
1409                 rc = dump_set_type(DUMP_TYPE_FCP);
1410         return (rc != 0) ? rc : len;
1411 }
1412 
1413 static struct kobj_attribute dump_type_attr =
1414         __ATTR(dump_type, 0644, dump_type_show, dump_type_store);
1415 
1416 static struct kset *dump_kset;
1417 
1418 static void __dump_run(void *unused)
1419 {
1420         struct ccw_dev_id devid;
1421         static char buf[100];
1422 
1423         switch (dump_method) {
1424         case DUMP_METHOD_CCW_CIO:
1425                 devid.devno = dump_block_ccw->ipl_info.ccw.devno;
1426                 devid.ssid  = 0;
1427                 reipl_ccw_dev(&devid);
1428                 break;
1429         case DUMP_METHOD_CCW_VM:
1430                 sprintf(buf, "STORE STATUS");
1431                 __cpcmd(buf, NULL, 0, NULL);
1432                 sprintf(buf, "IPL %X", dump_block_ccw->ipl_info.ccw.devno);
1433                 __cpcmd(buf, NULL, 0, NULL);
1434                 break;
1435         case DUMP_METHOD_CCW_DIAG:
1436                 diag308(DIAG308_SET, dump_block_ccw);
1437                 diag308(DIAG308_DUMP, NULL);
1438                 break;
1439         case DUMP_METHOD_FCP_DIAG:
1440                 diag308(DIAG308_SET, dump_block_fcp);
1441                 diag308(DIAG308_DUMP, NULL);
1442                 break;
1443         default:
1444                 break;
1445         }
1446 }
1447 
1448 static void dump_run(struct shutdown_trigger *trigger)
1449 {
1450         if (dump_method == DUMP_METHOD_NONE)
1451                 return;
1452         smp_send_stop();
1453         smp_call_ipl_cpu(__dump_run, NULL);
1454 }
1455 
1456 static int __init dump_ccw_init(void)
1457 {
1458         int rc;
1459 
1460         dump_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
1461         if (!dump_block_ccw)
1462                 return -ENOMEM;
1463         rc = sysfs_create_group(&dump_kset->kobj, &dump_ccw_attr_group);
1464         if (rc) {
1465                 free_page((unsigned long)dump_block_ccw);
1466                 return rc;
1467         }
1468         dump_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
1469         dump_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
1470         dump_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
1471         dump_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
1472         dump_capabilities |= DUMP_TYPE_CCW;
1473         return 0;
1474 }
1475 
1476 static int __init dump_fcp_init(void)
1477 {
1478         int rc;
1479 
1480         if (!sclp_ipl_info.has_dump)
1481                 return 0; /* LDIPL DUMP is not installed */
1482         if (!diag308_set_works)
1483                 return 0;
1484         dump_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
1485         if (!dump_block_fcp)
1486                 return -ENOMEM;
1487         rc = sysfs_create_group(&dump_kset->kobj, &dump_fcp_attr_group);
1488         if (rc) {
1489                 free_page((unsigned long)dump_block_fcp);
1490                 return rc;
1491         }
1492         dump_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
1493         dump_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
1494         dump_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
1495         dump_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
1496         dump_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_DUMP;
1497         dump_capabilities |= DUMP_TYPE_FCP;
1498         return 0;
1499 }
1500 
1501 static int __init dump_init(void)
1502 {
1503         int rc;
1504 
1505         dump_kset = kset_create_and_add("dump", NULL, firmware_kobj);
1506         if (!dump_kset)
1507                 return -ENOMEM;
1508         rc = sysfs_create_file(&dump_kset->kobj, &dump_type_attr.attr);
1509         if (rc) {
1510                 kset_unregister(dump_kset);
1511                 return rc;
1512         }
1513         rc = dump_ccw_init();
1514         if (rc)
1515                 return rc;
1516         rc = dump_fcp_init();
1517         if (rc)
1518                 return rc;
1519         dump_set_type(DUMP_TYPE_NONE);
1520         return 0;
1521 }
1522 
1523 static struct shutdown_action __refdata dump_action = {
1524         .name   = SHUTDOWN_ACTION_DUMP_STR,
1525         .fn     = dump_run,
1526         .init   = dump_init,
1527 };
1528 
1529 static void dump_reipl_run(struct shutdown_trigger *trigger)
1530 {
1531         u32 csum;
1532 
1533         csum = csum_partial(reipl_block_actual, reipl_block_actual->hdr.len, 0);
1534         copy_to_absolute_zero(&S390_lowcore.ipib_checksum, &csum, sizeof(csum));
1535         copy_to_absolute_zero(&S390_lowcore.ipib, &reipl_block_actual,
1536                               sizeof(reipl_block_actual));
1537         dump_run(trigger);
1538 }
1539 
1540 static int __init dump_reipl_init(void)
1541 {
1542         if (!diag308_set_works)
1543                 return -EOPNOTSUPP;
1544         else
1545                 return 0;
1546 }
1547 
1548 static struct shutdown_action __refdata dump_reipl_action = {
1549         .name   = SHUTDOWN_ACTION_DUMP_REIPL_STR,
1550         .fn     = dump_reipl_run,
1551         .init   = dump_reipl_init,
1552 };
1553 
1554 /*
1555  * vmcmd shutdown action: Trigger vm command on shutdown.
1556  */
1557 
1558 static char vmcmd_on_reboot[128];
1559 static char vmcmd_on_panic[128];
1560 static char vmcmd_on_halt[128];
1561 static char vmcmd_on_poff[128];
1562 static char vmcmd_on_restart[128];
1563 
1564 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_reboot, "%s\n", "%s\n", vmcmd_on_reboot);
1565 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_panic, "%s\n", "%s\n", vmcmd_on_panic);
1566 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_halt, "%s\n", "%s\n", vmcmd_on_halt);
1567 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_poff, "%s\n", "%s\n", vmcmd_on_poff);
1568 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_restart, "%s\n", "%s\n", vmcmd_on_restart);
1569 
1570 static struct attribute *vmcmd_attrs[] = {
1571         &sys_vmcmd_on_reboot_attr.attr,
1572         &sys_vmcmd_on_panic_attr.attr,
1573         &sys_vmcmd_on_halt_attr.attr,
1574         &sys_vmcmd_on_poff_attr.attr,
1575         &sys_vmcmd_on_restart_attr.attr,
1576         NULL,
1577 };
1578 
1579 static struct attribute_group vmcmd_attr_group = {
1580         .attrs = vmcmd_attrs,
1581 };
1582 
1583 static struct kset *vmcmd_kset;
1584 
1585 static void vmcmd_run(struct shutdown_trigger *trigger)
1586 {
1587         char *cmd, *next_cmd;
1588 
1589         if (strcmp(trigger->name, ON_REIPL_STR) == 0)
1590                 cmd = vmcmd_on_reboot;
1591         else if (strcmp(trigger->name, ON_PANIC_STR) == 0)
1592                 cmd = vmcmd_on_panic;
1593         else if (strcmp(trigger->name, ON_HALT_STR) == 0)
1594                 cmd = vmcmd_on_halt;
1595         else if (strcmp(trigger->name, ON_POFF_STR) == 0)
1596                 cmd = vmcmd_on_poff;
1597         else if (strcmp(trigger->name, ON_RESTART_STR) == 0)
1598                 cmd = vmcmd_on_restart;
1599         else
1600                 return;
1601 
1602         if (strlen(cmd) == 0)
1603                 return;
1604         do {
1605                 next_cmd = strchr(cmd, '\n');
1606                 if (next_cmd) {
1607                         next_cmd[0] = 0;
1608                         next_cmd += 1;
1609                 }
1610                 __cpcmd(cmd, NULL, 0, NULL);
1611                 cmd = next_cmd;
1612         } while (cmd != NULL);
1613 }
1614 
1615 static int vmcmd_init(void)
1616 {
1617         if (!MACHINE_IS_VM)
1618                 return -EOPNOTSUPP;
1619         vmcmd_kset = kset_create_and_add("vmcmd", NULL, firmware_kobj);
1620         if (!vmcmd_kset)
1621                 return -ENOMEM;
1622         return sysfs_create_group(&vmcmd_kset->kobj, &vmcmd_attr_group);
1623 }
1624 
1625 static struct shutdown_action vmcmd_action = {SHUTDOWN_ACTION_VMCMD_STR,
1626                                               vmcmd_run, vmcmd_init};
1627 
1628 /*
1629  * stop shutdown action: Stop Linux on shutdown.
1630  */
1631 
1632 static void stop_run(struct shutdown_trigger *trigger)
1633 {
1634         if (strcmp(trigger->name, ON_PANIC_STR) == 0 ||
1635             strcmp(trigger->name, ON_RESTART_STR) == 0)
1636                 disabled_wait((unsigned long) __builtin_return_address(0));
1637         smp_stop_cpu();
1638 }
1639 
1640 static struct shutdown_action stop_action = {SHUTDOWN_ACTION_STOP_STR,
1641                                              stop_run, NULL};
1642 
1643 /* action list */
1644 
1645 static struct shutdown_action *shutdown_actions_list[] = {
1646         &ipl_action, &reipl_action, &dump_reipl_action, &dump_action,
1647         &vmcmd_action, &stop_action};
1648 #define SHUTDOWN_ACTIONS_COUNT (sizeof(shutdown_actions_list) / sizeof(void *))
1649 
1650 /*
1651  * Trigger section
1652  */
1653 
1654 static struct kset *shutdown_actions_kset;
1655 
1656 static int set_trigger(const char *buf, struct shutdown_trigger *trigger,
1657                        size_t len)
1658 {
1659         int i;
1660 
1661         for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
1662                 if (sysfs_streq(buf, shutdown_actions_list[i]->name)) {
1663                         if (shutdown_actions_list[i]->init_rc) {
1664                                 return shutdown_actions_list[i]->init_rc;
1665                         } else {
1666                                 trigger->action = shutdown_actions_list[i];
1667                                 return len;
1668                         }
1669                 }
1670         }
1671         return -EINVAL;
1672 }
1673 
1674 /* on reipl */
1675 
1676 static struct shutdown_trigger on_reboot_trigger = {ON_REIPL_STR,
1677                                                     &reipl_action};
1678 
1679 static ssize_t on_reboot_show(struct kobject *kobj,
1680                               struct kobj_attribute *attr, char *page)
1681 {
1682         return sprintf(page, "%s\n", on_reboot_trigger.action->name);
1683 }
1684 
1685 static ssize_t on_reboot_store(struct kobject *kobj,
1686                                struct kobj_attribute *attr,
1687                                const char *buf, size_t len)
1688 {
1689         return set_trigger(buf, &on_reboot_trigger, len);
1690 }
1691 
1692 static struct kobj_attribute on_reboot_attr =
1693         __ATTR(on_reboot, 0644, on_reboot_show, on_reboot_store);
1694 
1695 static void do_machine_restart(char *__unused)
1696 {
1697         smp_send_stop();
1698         on_reboot_trigger.action->fn(&on_reboot_trigger);
1699         reipl_run(NULL);
1700 }
1701 void (*_machine_restart)(char *command) = do_machine_restart;
1702 
1703 /* on panic */
1704 
1705 static struct shutdown_trigger on_panic_trigger = {ON_PANIC_STR, &stop_action};
1706 
1707 static ssize_t on_panic_show(struct kobject *kobj,
1708                              struct kobj_attribute *attr, char *page)
1709 {
1710         return sprintf(page, "%s\n", on_panic_trigger.action->name);
1711 }
1712 
1713 static ssize_t on_panic_store(struct kobject *kobj,
1714                               struct kobj_attribute *attr,
1715                               const char *buf, size_t len)
1716 {
1717         return set_trigger(buf, &on_panic_trigger, len);
1718 }
1719 
1720 static struct kobj_attribute on_panic_attr =
1721         __ATTR(on_panic, 0644, on_panic_show, on_panic_store);
1722 
1723 static void do_panic(void)
1724 {
1725         lgr_info_log();
1726         on_panic_trigger.action->fn(&on_panic_trigger);
1727         stop_run(&on_panic_trigger);
1728 }
1729 
1730 /* on restart */
1731 
1732 static struct shutdown_trigger on_restart_trigger = {ON_RESTART_STR,
1733         &stop_action};
1734 
1735 static ssize_t on_restart_show(struct kobject *kobj,
1736                                struct kobj_attribute *attr, char *page)
1737 {
1738         return sprintf(page, "%s\n", on_restart_trigger.action->name);
1739 }
1740 
1741 static ssize_t on_restart_store(struct kobject *kobj,
1742                                 struct kobj_attribute *attr,
1743                                 const char *buf, size_t len)
1744 {
1745         return set_trigger(buf, &on_restart_trigger, len);
1746 }
1747 
1748 static struct kobj_attribute on_restart_attr =
1749         __ATTR(on_restart, 0644, on_restart_show, on_restart_store);
1750 
1751 static void __do_restart(void *ignore)
1752 {
1753         smp_send_stop();
1754 #ifdef CONFIG_CRASH_DUMP
1755         crash_kexec(NULL);
1756 #endif
1757         on_restart_trigger.action->fn(&on_restart_trigger);
1758         stop_run(&on_restart_trigger);
1759 }
1760 
1761 void do_restart(void)
1762 {
1763         tracing_off();
1764         debug_locks_off();
1765         lgr_info_log();
1766         smp_call_online_cpu(__do_restart, NULL);
1767 }
1768 
1769 /* on halt */
1770 
1771 static struct shutdown_trigger on_halt_trigger = {ON_HALT_STR, &stop_action};
1772 
1773 static ssize_t on_halt_show(struct kobject *kobj,
1774                             struct kobj_attribute *attr, char *page)
1775 {
1776         return sprintf(page, "%s\n", on_halt_trigger.action->name);
1777 }
1778 
1779 static ssize_t on_halt_store(struct kobject *kobj,
1780                              struct kobj_attribute *attr,
1781                              const char *buf, size_t len)
1782 {
1783         return set_trigger(buf, &on_halt_trigger, len);
1784 }
1785 
1786 static struct kobj_attribute on_halt_attr =
1787         __ATTR(on_halt, 0644, on_halt_show, on_halt_store);
1788 
1789 
1790 static void do_machine_halt(void)
1791 {
1792         smp_send_stop();
1793         on_halt_trigger.action->fn(&on_halt_trigger);
1794         stop_run(&on_halt_trigger);
1795 }
1796 void (*_machine_halt)(void) = do_machine_halt;
1797 
1798 /* on power off */
1799 
1800 static struct shutdown_trigger on_poff_trigger = {ON_POFF_STR, &stop_action};
1801 
1802 static ssize_t on_poff_show(struct kobject *kobj,
1803                             struct kobj_attribute *attr, char *page)
1804 {
1805         return sprintf(page, "%s\n", on_poff_trigger.action->name);
1806 }
1807 
1808 static ssize_t on_poff_store(struct kobject *kobj,
1809                              struct kobj_attribute *attr,
1810                              const char *buf, size_t len)
1811 {
1812         return set_trigger(buf, &on_poff_trigger, len);
1813 }
1814 
1815 static struct kobj_attribute on_poff_attr =
1816         __ATTR(on_poff, 0644, on_poff_show, on_poff_store);
1817 
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 void __init shutdown_triggers_init(void)
1828 {
1829         shutdown_actions_kset = kset_create_and_add("shutdown_actions", NULL,
1830                                                     firmware_kobj);
1831         if (!shutdown_actions_kset)
1832                 goto fail;
1833         if (sysfs_create_file(&shutdown_actions_kset->kobj,
1834                               &on_reboot_attr.attr))
1835                 goto fail;
1836         if (sysfs_create_file(&shutdown_actions_kset->kobj,
1837                               &on_panic_attr.attr))
1838                 goto fail;
1839         if (sysfs_create_file(&shutdown_actions_kset->kobj,
1840                               &on_halt_attr.attr))
1841                 goto fail;
1842         if (sysfs_create_file(&shutdown_actions_kset->kobj,
1843                               &on_poff_attr.attr))
1844                 goto fail;
1845         if (sysfs_create_file(&shutdown_actions_kset->kobj,
1846                               &on_restart_attr.attr))
1847                 goto fail;
1848         return;
1849 fail:
1850         panic("shutdown_triggers_init failed\n");
1851 }
1852 
1853 static void __init shutdown_actions_init(void)
1854 {
1855         int i;
1856 
1857         for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
1858                 if (!shutdown_actions_list[i]->init)
1859                         continue;
1860                 shutdown_actions_list[i]->init_rc =
1861                         shutdown_actions_list[i]->init();
1862         }
1863 }
1864 
1865 static int __init s390_ipl_init(void)
1866 {
1867         sclp_get_ipl_info(&sclp_ipl_info);
1868         shutdown_actions_init();
1869         shutdown_triggers_init();
1870         return 0;
1871 }
1872 
1873 __initcall(s390_ipl_init);
1874 
1875 static void __init strncpy_skip_quote(char *dst, char *src, int n)
1876 {
1877         int sx, dx;
1878 
1879         dx = 0;
1880         for (sx = 0; src[sx] != 0; sx++) {
1881                 if (src[sx] == '"')
1882                         continue;
1883                 dst[dx++] = src[sx];
1884                 if (dx >= n)
1885                         break;
1886         }
1887 }
1888 
1889 static int __init vmcmd_on_reboot_setup(char *str)
1890 {
1891         if (!MACHINE_IS_VM)
1892                 return 1;
1893         strncpy_skip_quote(vmcmd_on_reboot, str, 127);
1894         vmcmd_on_reboot[127] = 0;
1895         on_reboot_trigger.action = &vmcmd_action;
1896         return 1;
1897 }
1898 __setup("vmreboot=", vmcmd_on_reboot_setup);
1899 
1900 static int __init vmcmd_on_panic_setup(char *str)
1901 {
1902         if (!MACHINE_IS_VM)
1903                 return 1;
1904         strncpy_skip_quote(vmcmd_on_panic, str, 127);
1905         vmcmd_on_panic[127] = 0;
1906         on_panic_trigger.action = &vmcmd_action;
1907         return 1;
1908 }
1909 __setup("vmpanic=", vmcmd_on_panic_setup);
1910 
1911 static int __init vmcmd_on_halt_setup(char *str)
1912 {
1913         if (!MACHINE_IS_VM)
1914                 return 1;
1915         strncpy_skip_quote(vmcmd_on_halt, str, 127);
1916         vmcmd_on_halt[127] = 0;
1917         on_halt_trigger.action = &vmcmd_action;
1918         return 1;
1919 }
1920 __setup("vmhalt=", vmcmd_on_halt_setup);
1921 
1922 static int __init vmcmd_on_poff_setup(char *str)
1923 {
1924         if (!MACHINE_IS_VM)
1925                 return 1;
1926         strncpy_skip_quote(vmcmd_on_poff, str, 127);
1927         vmcmd_on_poff[127] = 0;
1928         on_poff_trigger.action = &vmcmd_action;
1929         return 1;
1930 }
1931 __setup("vmpoff=", vmcmd_on_poff_setup);
1932 
1933 static int on_panic_notify(struct notifier_block *self,
1934                            unsigned long event, void *data)
1935 {
1936         do_panic();
1937         return NOTIFY_OK;
1938 }
1939 
1940 static struct notifier_block on_panic_nb = {
1941         .notifier_call = on_panic_notify,
1942         .priority = INT_MIN,
1943 };
1944 
1945 void __init setup_ipl(void)
1946 {
1947         ipl_info.type = get_ipl_type();
1948         switch (ipl_info.type) {
1949         case IPL_TYPE_CCW:
1950                 ipl_info.data.ccw.dev_id.devno = ipl_devno;
1951                 ipl_info.data.ccw.dev_id.ssid = 0;
1952                 break;
1953         case IPL_TYPE_FCP:
1954         case IPL_TYPE_FCP_DUMP:
1955                 ipl_info.data.fcp.dev_id.devno =
1956                         IPL_PARMBLOCK_START->ipl_info.fcp.devno;
1957                 ipl_info.data.fcp.dev_id.ssid = 0;
1958                 ipl_info.data.fcp.wwpn = IPL_PARMBLOCK_START->ipl_info.fcp.wwpn;
1959                 ipl_info.data.fcp.lun = IPL_PARMBLOCK_START->ipl_info.fcp.lun;
1960                 break;
1961         case IPL_TYPE_NSS:
1962                 strncpy(ipl_info.data.nss.name, kernel_nss_name,
1963                         sizeof(ipl_info.data.nss.name));
1964                 break;
1965         case IPL_TYPE_UNKNOWN:
1966                 /* We have no info to copy */
1967                 break;
1968         }
1969         atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
1970 }
1971 
1972 void __init ipl_update_parameters(void)
1973 {
1974         int rc;
1975 
1976         rc = diag308(DIAG308_STORE, &ipl_block);
1977         if ((rc == DIAG308_RC_OK) || (rc == DIAG308_RC_NOCONFIG))
1978                 diag308_set_works = 1;
1979 }
1980 
1981 void __init ipl_save_parameters(void)
1982 {
1983         struct cio_iplinfo iplinfo;
1984         void *src, *dst;
1985 
1986         if (cio_get_iplinfo(&iplinfo))
1987                 return;
1988 
1989         ipl_devno = iplinfo.devno;
1990         ipl_flags |= IPL_DEVNO_VALID;
1991         if (!iplinfo.is_qdio)
1992                 return;
1993         ipl_flags |= IPL_PARMBLOCK_VALID;
1994         src = (void *)(unsigned long)S390_lowcore.ipl_parmblock_ptr;
1995         dst = (void *)IPL_PARMBLOCK_ORIGIN;
1996         memmove(dst, src, PAGE_SIZE);
1997         S390_lowcore.ipl_parmblock_ptr = IPL_PARMBLOCK_ORIGIN;
1998 }
1999 
2000 static LIST_HEAD(rcall);
2001 static DEFINE_MUTEX(rcall_mutex);
2002 
2003 void register_reset_call(struct reset_call *reset)
2004 {
2005         mutex_lock(&rcall_mutex);
2006         list_add(&reset->list, &rcall);
2007         mutex_unlock(&rcall_mutex);
2008 }
2009 EXPORT_SYMBOL_GPL(register_reset_call);
2010 
2011 void unregister_reset_call(struct reset_call *reset)
2012 {
2013         mutex_lock(&rcall_mutex);
2014         list_del(&reset->list);
2015         mutex_unlock(&rcall_mutex);
2016 }
2017 EXPORT_SYMBOL_GPL(unregister_reset_call);
2018 
2019 static void do_reset_calls(void)
2020 {
2021         struct reset_call *reset;
2022 
2023 #ifdef CONFIG_64BIT
2024         if (diag308_set_works) {
2025                 diag308_reset();
2026                 return;
2027         }
2028 #endif
2029         list_for_each_entry(reset, &rcall, list)
2030                 reset->fn();
2031 }
2032 
2033 u32 dump_prefix_page;
2034 
2035 void s390_reset_system(void (*func)(void *), void *data)
2036 {
2037         struct _lowcore *lc;
2038 
2039         lc = (struct _lowcore *)(unsigned long) store_prefix();
2040 
2041         /* Stack for interrupt/machine check handler */
2042         lc->panic_stack = S390_lowcore.panic_stack;
2043 
2044         /* Save prefix page address for dump case */
2045         dump_prefix_page = (u32)(unsigned long) lc;
2046 
2047         /* Disable prefixing */
2048         set_prefix(0);
2049 
2050         /* Disable lowcore protection */
2051         __ctl_clear_bit(0,28);
2052 
2053         /* Set new machine check handler */
2054         S390_lowcore.mcck_new_psw.mask = psw_kernel_bits | PSW_MASK_DAT;
2055         S390_lowcore.mcck_new_psw.addr =
2056                 PSW_ADDR_AMODE | (unsigned long) s390_base_mcck_handler;
2057 
2058         /* Set new program check handler */
2059         S390_lowcore.program_new_psw.mask = psw_kernel_bits | PSW_MASK_DAT;
2060         S390_lowcore.program_new_psw.addr =
2061                 PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
2062 
2063         /* Store status at absolute zero */
2064         store_status();
2065 
2066         do_reset_calls();
2067         if (func)
2068                 func(data);
2069 }
2070 

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