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Linux/arch/s390/kernel/ipl.c

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  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/module.h>
 12 #include <linux/device.h>
 13 #include <linux/delay.h>
 14 #include <linux/reboot.h>
 15 #include <linux/ctype.h>
 16 #include <linux/fs.h>
 17 #include <linux/gfp.h>
 18 #include <linux/crash_dump.h>
 19 #include <linux/debug_locks.h>
 20 #include <asm/diag.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 u8 ipl_ssid __attribute__((__section__(".data"))) = 0;
125 static u16 ipl_devno __attribute__((__section__(".data"))) = 0;
126 u32 ipl_flags __attribute__((__section__(".data"))) = 0;
127 
128 enum ipl_method {
129         REIPL_METHOD_CCW_CIO,
130         REIPL_METHOD_CCW_DIAG,
131         REIPL_METHOD_CCW_VM,
132         REIPL_METHOD_FCP_RO_DIAG,
133         REIPL_METHOD_FCP_RW_DIAG,
134         REIPL_METHOD_FCP_RO_VM,
135         REIPL_METHOD_FCP_DUMP,
136         REIPL_METHOD_NSS,
137         REIPL_METHOD_NSS_DIAG,
138         REIPL_METHOD_DEFAULT,
139 };
140 
141 enum dump_method {
142         DUMP_METHOD_NONE,
143         DUMP_METHOD_CCW_CIO,
144         DUMP_METHOD_CCW_DIAG,
145         DUMP_METHOD_CCW_VM,
146         DUMP_METHOD_FCP_DIAG,
147 };
148 
149 static int diag308_set_works = 0;
150 
151 static struct ipl_parameter_block ipl_block;
152 
153 static int reipl_capabilities = IPL_TYPE_UNKNOWN;
154 
155 static enum ipl_type reipl_type = IPL_TYPE_UNKNOWN;
156 static enum ipl_method reipl_method = REIPL_METHOD_DEFAULT;
157 static struct ipl_parameter_block *reipl_block_fcp;
158 static struct ipl_parameter_block *reipl_block_ccw;
159 static struct ipl_parameter_block *reipl_block_nss;
160 static struct ipl_parameter_block *reipl_block_actual;
161 
162 static int dump_capabilities = DUMP_TYPE_NONE;
163 static enum dump_type dump_type = DUMP_TYPE_NONE;
164 static enum dump_method dump_method = DUMP_METHOD_NONE;
165 static struct ipl_parameter_block *dump_block_fcp;
166 static struct ipl_parameter_block *dump_block_ccw;
167 
168 static struct sclp_ipl_info sclp_ipl_info;
169 
170 static inline int __diag308(unsigned long subcode, void *addr)
171 {
172         register unsigned long _addr asm("") = (unsigned long) addr;
173         register unsigned long _rc asm("1") = 0;
174 
175         asm volatile(
176                 "       diag    %0,%2,0x308\n"
177                 "0:\n"
178                 EX_TABLE(0b,0b)
179                 : "+d" (_addr), "+d" (_rc)
180                 : "d" (subcode) : "cc", "memory");
181         return _rc;
182 }
183 
184 int diag308(unsigned long subcode, void *addr)
185 {
186         diag_stat_inc(DIAG_STAT_X308);
187         return __diag308(subcode, addr);
188 }
189 EXPORT_SYMBOL_GPL(diag308);
190 
191 /* SYSFS */
192 
193 #define IPL_ATTR_SHOW_FN(_prefix, _name, _format, args...)              \
194 static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj,     \
195                 struct kobj_attribute *attr,                            \
196                 char *page)                                             \
197 {                                                                       \
198         return snprintf(page, PAGE_SIZE, _format, ##args);              \
199 }
200 
201 #define IPL_ATTR_CCW_STORE_FN(_prefix, _name, _ipl_blk)                 \
202 static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,    \
203                 struct kobj_attribute *attr,                            \
204                 const char *buf, size_t len)                            \
205 {                                                                       \
206         unsigned long long ssid, devno;                                 \
207                                                                         \
208         if (sscanf(buf, "0.%llx.%llx\n", &ssid, &devno) != 2)           \
209                 return -EINVAL;                                         \
210                                                                         \
211         if (ssid > __MAX_SSID || devno > __MAX_SUBCHANNEL)              \
212                 return -EINVAL;                                         \
213                                                                         \
214         _ipl_blk.ssid = ssid;                                           \
215         _ipl_blk.devno = devno;                                         \
216         return len;                                                     \
217 }
218 
219 #define DEFINE_IPL_CCW_ATTR_RW(_prefix, _name, _ipl_blk)                \
220 IPL_ATTR_SHOW_FN(_prefix, _name, "0.%x.%04x\n",                         \
221                  _ipl_blk.ssid, _ipl_blk.devno);                        \
222 IPL_ATTR_CCW_STORE_FN(_prefix, _name, _ipl_blk);                        \
223 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
224         __ATTR(_name, (S_IRUGO | S_IWUSR),                              \
225                sys_##_prefix##_##_name##_show,                          \
226                sys_##_prefix##_##_name##_store)                         \
227 
228 #define DEFINE_IPL_ATTR_RO(_prefix, _name, _format, _value)             \
229 IPL_ATTR_SHOW_FN(_prefix, _name, _format, _value)                       \
230 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
231         __ATTR(_name, S_IRUGO, sys_##_prefix##_##_name##_show, NULL)
232 
233 #define DEFINE_IPL_ATTR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)   \
234 IPL_ATTR_SHOW_FN(_prefix, _name, _fmt_out, (unsigned long long) _value) \
235 static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,    \
236                 struct kobj_attribute *attr,                            \
237                 const char *buf, size_t len)                            \
238 {                                                                       \
239         unsigned long long value;                                       \
240         if (sscanf(buf, _fmt_in, &value) != 1)                          \
241                 return -EINVAL;                                         \
242         _value = value;                                                 \
243         return len;                                                     \
244 }                                                                       \
245 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
246         __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
247                         sys_##_prefix##_##_name##_show,                 \
248                         sys_##_prefix##_##_name##_store)
249 
250 #define DEFINE_IPL_ATTR_STR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)\
251 IPL_ATTR_SHOW_FN(_prefix, _name, _fmt_out, _value)                      \
252 static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,    \
253                 struct kobj_attribute *attr,                            \
254                 const char *buf, size_t len)                            \
255 {                                                                       \
256         strncpy(_value, buf, sizeof(_value) - 1);                       \
257         strim(_value);                                                  \
258         return len;                                                     \
259 }                                                                       \
260 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
261         __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
262                         sys_##_prefix##_##_name##_show,                 \
263                         sys_##_prefix##_##_name##_store)
264 
265 static void make_attrs_ro(struct attribute **attrs)
266 {
267         while (*attrs) {
268                 (*attrs)->mode = S_IRUGO;
269                 attrs++;
270         }
271 }
272 
273 /*
274  * ipl section
275  */
276 
277 static __init enum ipl_type get_ipl_type(void)
278 {
279         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
280 
281         if (ipl_flags & IPL_NSS_VALID)
282                 return IPL_TYPE_NSS;
283         if (!(ipl_flags & IPL_DEVNO_VALID))
284                 return IPL_TYPE_UNKNOWN;
285         if (!(ipl_flags & IPL_PARMBLOCK_VALID))
286                 return IPL_TYPE_CCW;
287         if (ipl->hdr.version > IPL_MAX_SUPPORTED_VERSION)
288                 return IPL_TYPE_UNKNOWN;
289         if (ipl->hdr.pbt != DIAG308_IPL_TYPE_FCP)
290                 return IPL_TYPE_UNKNOWN;
291         if (ipl->ipl_info.fcp.opt == DIAG308_IPL_OPT_DUMP)
292                 return IPL_TYPE_FCP_DUMP;
293         return IPL_TYPE_FCP;
294 }
295 
296 struct ipl_info ipl_info;
297 EXPORT_SYMBOL_GPL(ipl_info);
298 
299 static ssize_t ipl_type_show(struct kobject *kobj, struct kobj_attribute *attr,
300                              char *page)
301 {
302         return sprintf(page, "%s\n", ipl_type_str(ipl_info.type));
303 }
304 
305 static struct kobj_attribute sys_ipl_type_attr = __ATTR_RO(ipl_type);
306 
307 /* VM IPL PARM routines */
308 static size_t reipl_get_ascii_vmparm(char *dest, size_t size,
309                                      const struct ipl_parameter_block *ipb)
310 {
311         int i;
312         size_t len;
313         char has_lowercase = 0;
314 
315         len = 0;
316         if ((ipb->ipl_info.ccw.vm_flags & DIAG308_VM_FLAGS_VP_VALID) &&
317             (ipb->ipl_info.ccw.vm_parm_len > 0)) {
318 
319                 len = min_t(size_t, size - 1, ipb->ipl_info.ccw.vm_parm_len);
320                 memcpy(dest, ipb->ipl_info.ccw.vm_parm, len);
321                 /* If at least one character is lowercase, we assume mixed
322                  * case; otherwise we convert everything to lowercase.
323                  */
324                 for (i = 0; i < len; i++)
325                         if ((dest[i] > 0x80 && dest[i] < 0x8a) || /* a-i */
326                             (dest[i] > 0x90 && dest[i] < 0x9a) || /* j-r */
327                             (dest[i] > 0xa1 && dest[i] < 0xaa)) { /* s-z */
328                                 has_lowercase = 1;
329                                 break;
330                         }
331                 if (!has_lowercase)
332                         EBC_TOLOWER(dest, len);
333                 EBCASC(dest, len);
334         }
335         dest[len] = 0;
336 
337         return len;
338 }
339 
340 size_t append_ipl_vmparm(char *dest, size_t size)
341 {
342         size_t rc;
343 
344         rc = 0;
345         if (diag308_set_works && (ipl_block.hdr.pbt == DIAG308_IPL_TYPE_CCW))
346                 rc = reipl_get_ascii_vmparm(dest, size, &ipl_block);
347         else
348                 dest[0] = 0;
349         return rc;
350 }
351 
352 static ssize_t ipl_vm_parm_show(struct kobject *kobj,
353                                 struct kobj_attribute *attr, char *page)
354 {
355         char parm[DIAG308_VMPARM_SIZE + 1] = {};
356 
357         append_ipl_vmparm(parm, sizeof(parm));
358         return sprintf(page, "%s\n", parm);
359 }
360 
361 static size_t scpdata_length(const char* buf, size_t count)
362 {
363         while (count) {
364                 if (buf[count - 1] != '\0' && buf[count - 1] != ' ')
365                         break;
366                 count--;
367         }
368         return count;
369 }
370 
371 static size_t reipl_append_ascii_scpdata(char *dest, size_t size,
372                                          const struct ipl_parameter_block *ipb)
373 {
374         size_t count;
375         size_t i;
376         int has_lowercase;
377 
378         count = min(size - 1, scpdata_length(ipb->ipl_info.fcp.scp_data,
379                                              ipb->ipl_info.fcp.scp_data_len));
380         if (!count)
381                 goto out;
382 
383         has_lowercase = 0;
384         for (i = 0; i < count; i++) {
385                 if (!isascii(ipb->ipl_info.fcp.scp_data[i])) {
386                         count = 0;
387                         goto out;
388                 }
389                 if (!has_lowercase && islower(ipb->ipl_info.fcp.scp_data[i]))
390                         has_lowercase = 1;
391         }
392 
393         if (has_lowercase)
394                 memcpy(dest, ipb->ipl_info.fcp.scp_data, count);
395         else
396                 for (i = 0; i < count; i++)
397                         dest[i] = tolower(ipb->ipl_info.fcp.scp_data[i]);
398 out:
399         dest[count] = '\0';
400         return count;
401 }
402 
403 size_t append_ipl_scpdata(char *dest, size_t len)
404 {
405         size_t rc;
406 
407         rc = 0;
408         if (ipl_block.hdr.pbt == DIAG308_IPL_TYPE_FCP)
409                 rc = reipl_append_ascii_scpdata(dest, len, &ipl_block);
410         else
411                 dest[0] = 0;
412         return rc;
413 }
414 
415 
416 static struct kobj_attribute sys_ipl_vm_parm_attr =
417         __ATTR(parm, S_IRUGO, ipl_vm_parm_show, NULL);
418 
419 static ssize_t sys_ipl_device_show(struct kobject *kobj,
420                                    struct kobj_attribute *attr, char *page)
421 {
422         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
423 
424         switch (ipl_info.type) {
425         case IPL_TYPE_CCW:
426                 return sprintf(page, "0.%x.%04x\n", ipl_ssid, ipl_devno);
427         case IPL_TYPE_FCP:
428         case IPL_TYPE_FCP_DUMP:
429                 return sprintf(page, "0.0.%04x\n", ipl->ipl_info.fcp.devno);
430         default:
431                 return 0;
432         }
433 }
434 
435 static struct kobj_attribute sys_ipl_device_attr =
436         __ATTR(device, S_IRUGO, sys_ipl_device_show, NULL);
437 
438 static ssize_t ipl_parameter_read(struct file *filp, struct kobject *kobj,
439                                   struct bin_attribute *attr, char *buf,
440                                   loff_t off, size_t count)
441 {
442         return memory_read_from_buffer(buf, count, &off, IPL_PARMBLOCK_START,
443                                         IPL_PARMBLOCK_SIZE);
444 }
445 static struct bin_attribute ipl_parameter_attr =
446         __BIN_ATTR(binary_parameter, S_IRUGO, ipl_parameter_read, NULL,
447                    PAGE_SIZE);
448 
449 static ssize_t ipl_scp_data_read(struct file *filp, struct kobject *kobj,
450                                  struct bin_attribute *attr, char *buf,
451                                  loff_t off, size_t count)
452 {
453         unsigned int size = IPL_PARMBLOCK_START->ipl_info.fcp.scp_data_len;
454         void *scp_data = &IPL_PARMBLOCK_START->ipl_info.fcp.scp_data;
455 
456         return memory_read_from_buffer(buf, count, &off, scp_data, size);
457 }
458 static struct bin_attribute ipl_scp_data_attr =
459         __BIN_ATTR(scp_data, S_IRUGO, ipl_scp_data_read, NULL, PAGE_SIZE);
460 
461 static struct bin_attribute *ipl_fcp_bin_attrs[] = {
462         &ipl_parameter_attr,
463         &ipl_scp_data_attr,
464         NULL,
465 };
466 
467 /* FCP ipl device attributes */
468 
469 DEFINE_IPL_ATTR_RO(ipl_fcp, wwpn, "0x%016llx\n", (unsigned long long)
470                    IPL_PARMBLOCK_START->ipl_info.fcp.wwpn);
471 DEFINE_IPL_ATTR_RO(ipl_fcp, lun, "0x%016llx\n", (unsigned long long)
472                    IPL_PARMBLOCK_START->ipl_info.fcp.lun);
473 DEFINE_IPL_ATTR_RO(ipl_fcp, bootprog, "%lld\n", (unsigned long long)
474                    IPL_PARMBLOCK_START->ipl_info.fcp.bootprog);
475 DEFINE_IPL_ATTR_RO(ipl_fcp, br_lba, "%lld\n", (unsigned long long)
476                    IPL_PARMBLOCK_START->ipl_info.fcp.br_lba);
477 
478 static ssize_t ipl_ccw_loadparm_show(struct kobject *kobj,
479                                      struct kobj_attribute *attr, char *page)
480 {
481         char loadparm[LOADPARM_LEN + 1] = {};
482 
483         if (!sclp_ipl_info.is_valid)
484                 return sprintf(page, "#unknown#\n");
485         memcpy(loadparm, &sclp_ipl_info.loadparm, LOADPARM_LEN);
486         EBCASC(loadparm, LOADPARM_LEN);
487         strim(loadparm);
488         return sprintf(page, "%s\n", loadparm);
489 }
490 
491 static struct kobj_attribute sys_ipl_ccw_loadparm_attr =
492         __ATTR(loadparm, 0444, ipl_ccw_loadparm_show, NULL);
493 
494 static struct attribute *ipl_fcp_attrs[] = {
495         &sys_ipl_type_attr.attr,
496         &sys_ipl_device_attr.attr,
497         &sys_ipl_fcp_wwpn_attr.attr,
498         &sys_ipl_fcp_lun_attr.attr,
499         &sys_ipl_fcp_bootprog_attr.attr,
500         &sys_ipl_fcp_br_lba_attr.attr,
501         &sys_ipl_ccw_loadparm_attr.attr,
502         NULL,
503 };
504 
505 static struct attribute_group ipl_fcp_attr_group = {
506         .attrs = ipl_fcp_attrs,
507         .bin_attrs = ipl_fcp_bin_attrs,
508 };
509 
510 /* CCW ipl device attributes */
511 
512 static struct attribute *ipl_ccw_attrs_vm[] = {
513         &sys_ipl_type_attr.attr,
514         &sys_ipl_device_attr.attr,
515         &sys_ipl_ccw_loadparm_attr.attr,
516         &sys_ipl_vm_parm_attr.attr,
517         NULL,
518 };
519 
520 static struct attribute *ipl_ccw_attrs_lpar[] = {
521         &sys_ipl_type_attr.attr,
522         &sys_ipl_device_attr.attr,
523         &sys_ipl_ccw_loadparm_attr.attr,
524         NULL,
525 };
526 
527 static struct attribute_group ipl_ccw_attr_group_vm = {
528         .attrs = ipl_ccw_attrs_vm,
529 };
530 
531 static struct attribute_group ipl_ccw_attr_group_lpar = {
532         .attrs = ipl_ccw_attrs_lpar
533 };
534 
535 /* NSS ipl device attributes */
536 
537 DEFINE_IPL_ATTR_RO(ipl_nss, name, "%s\n", kernel_nss_name);
538 
539 static struct attribute *ipl_nss_attrs[] = {
540         &sys_ipl_type_attr.attr,
541         &sys_ipl_nss_name_attr.attr,
542         &sys_ipl_ccw_loadparm_attr.attr,
543         &sys_ipl_vm_parm_attr.attr,
544         NULL,
545 };
546 
547 static struct attribute_group ipl_nss_attr_group = {
548         .attrs = ipl_nss_attrs,
549 };
550 
551 /* UNKNOWN ipl device attributes */
552 
553 static struct attribute *ipl_unknown_attrs[] = {
554         &sys_ipl_type_attr.attr,
555         NULL,
556 };
557 
558 static struct attribute_group ipl_unknown_attr_group = {
559         .attrs = ipl_unknown_attrs,
560 };
561 
562 static struct kset *ipl_kset;
563 
564 static void __ipl_run(void *unused)
565 {
566         diag308(DIAG308_IPL, NULL);
567         if (MACHINE_IS_VM)
568                 __cpcmd("IPL", NULL, 0, NULL);
569         else if (ipl_info.type == IPL_TYPE_CCW)
570                 reipl_ccw_dev(&ipl_info.data.ccw.dev_id);
571 }
572 
573 static void ipl_run(struct shutdown_trigger *trigger)
574 {
575         smp_call_ipl_cpu(__ipl_run, NULL);
576 }
577 
578 static int __init ipl_init(void)
579 {
580         int rc;
581 
582         ipl_kset = kset_create_and_add("ipl", NULL, firmware_kobj);
583         if (!ipl_kset) {
584                 rc = -ENOMEM;
585                 goto out;
586         }
587         switch (ipl_info.type) {
588         case IPL_TYPE_CCW:
589                 if (MACHINE_IS_VM)
590                         rc = sysfs_create_group(&ipl_kset->kobj,
591                                                 &ipl_ccw_attr_group_vm);
592                 else
593                         rc = sysfs_create_group(&ipl_kset->kobj,
594                                                 &ipl_ccw_attr_group_lpar);
595                 break;
596         case IPL_TYPE_FCP:
597         case IPL_TYPE_FCP_DUMP:
598                 rc = sysfs_create_group(&ipl_kset->kobj, &ipl_fcp_attr_group);
599                 break;
600         case IPL_TYPE_NSS:
601                 rc = sysfs_create_group(&ipl_kset->kobj, &ipl_nss_attr_group);
602                 break;
603         default:
604                 rc = sysfs_create_group(&ipl_kset->kobj,
605                                         &ipl_unknown_attr_group);
606                 break;
607         }
608 out:
609         if (rc)
610                 panic("ipl_init failed: rc = %i\n", rc);
611 
612         return 0;
613 }
614 
615 static struct shutdown_action __refdata ipl_action = {
616         .name   = SHUTDOWN_ACTION_IPL_STR,
617         .fn     = ipl_run,
618         .init   = ipl_init,
619 };
620 
621 /*
622  * reipl shutdown action: Reboot Linux on shutdown.
623  */
624 
625 /* VM IPL PARM attributes */
626 static ssize_t reipl_generic_vmparm_show(struct ipl_parameter_block *ipb,
627                                           char *page)
628 {
629         char vmparm[DIAG308_VMPARM_SIZE + 1] = {};
630 
631         reipl_get_ascii_vmparm(vmparm, sizeof(vmparm), ipb);
632         return sprintf(page, "%s\n", vmparm);
633 }
634 
635 static ssize_t reipl_generic_vmparm_store(struct ipl_parameter_block *ipb,
636                                           size_t vmparm_max,
637                                           const char *buf, size_t len)
638 {
639         int i, ip_len;
640 
641         /* ignore trailing newline */
642         ip_len = len;
643         if ((len > 0) && (buf[len - 1] == '\n'))
644                 ip_len--;
645 
646         if (ip_len > vmparm_max)
647                 return -EINVAL;
648 
649         /* parm is used to store kernel options, check for common chars */
650         for (i = 0; i < ip_len; i++)
651                 if (!(isalnum(buf[i]) || isascii(buf[i]) || isprint(buf[i])))
652                         return -EINVAL;
653 
654         memset(ipb->ipl_info.ccw.vm_parm, 0, DIAG308_VMPARM_SIZE);
655         ipb->ipl_info.ccw.vm_parm_len = ip_len;
656         if (ip_len > 0) {
657                 ipb->ipl_info.ccw.vm_flags |= DIAG308_VM_FLAGS_VP_VALID;
658                 memcpy(ipb->ipl_info.ccw.vm_parm, buf, ip_len);
659                 ASCEBC(ipb->ipl_info.ccw.vm_parm, ip_len);
660         } else {
661                 ipb->ipl_info.ccw.vm_flags &= ~DIAG308_VM_FLAGS_VP_VALID;
662         }
663 
664         return len;
665 }
666 
667 /* NSS wrapper */
668 static ssize_t reipl_nss_vmparm_show(struct kobject *kobj,
669                                      struct kobj_attribute *attr, char *page)
670 {
671         return reipl_generic_vmparm_show(reipl_block_nss, page);
672 }
673 
674 static ssize_t reipl_nss_vmparm_store(struct kobject *kobj,
675                                       struct kobj_attribute *attr,
676                                       const char *buf, size_t len)
677 {
678         return reipl_generic_vmparm_store(reipl_block_nss, 56, buf, len);
679 }
680 
681 /* CCW wrapper */
682 static ssize_t reipl_ccw_vmparm_show(struct kobject *kobj,
683                                      struct kobj_attribute *attr, char *page)
684 {
685         return reipl_generic_vmparm_show(reipl_block_ccw, page);
686 }
687 
688 static ssize_t reipl_ccw_vmparm_store(struct kobject *kobj,
689                                       struct kobj_attribute *attr,
690                                       const char *buf, size_t len)
691 {
692         return reipl_generic_vmparm_store(reipl_block_ccw, 64, buf, len);
693 }
694 
695 static struct kobj_attribute sys_reipl_nss_vmparm_attr =
696         __ATTR(parm, S_IRUGO | S_IWUSR, reipl_nss_vmparm_show,
697                                         reipl_nss_vmparm_store);
698 static struct kobj_attribute sys_reipl_ccw_vmparm_attr =
699         __ATTR(parm, S_IRUGO | S_IWUSR, reipl_ccw_vmparm_show,
700                                         reipl_ccw_vmparm_store);
701 
702 /* FCP reipl device attributes */
703 
704 static ssize_t reipl_fcp_scpdata_read(struct file *filp, struct kobject *kobj,
705                                       struct bin_attribute *attr,
706                                       char *buf, loff_t off, size_t count)
707 {
708         size_t size = reipl_block_fcp->ipl_info.fcp.scp_data_len;
709         void *scp_data = reipl_block_fcp->ipl_info.fcp.scp_data;
710 
711         return memory_read_from_buffer(buf, count, &off, scp_data, size);
712 }
713 
714 static ssize_t reipl_fcp_scpdata_write(struct file *filp, struct kobject *kobj,
715                                        struct bin_attribute *attr,
716                                        char *buf, loff_t off, size_t count)
717 {
718         size_t scpdata_len = count;
719         size_t padding;
720 
721 
722         if (off)
723                 return -EINVAL;
724 
725         memcpy(reipl_block_fcp->ipl_info.fcp.scp_data, buf, count);
726         if (scpdata_len % 8) {
727                 padding = 8 - (scpdata_len % 8);
728                 memset(reipl_block_fcp->ipl_info.fcp.scp_data + scpdata_len,
729                        0, padding);
730                 scpdata_len += padding;
731         }
732 
733         reipl_block_fcp->ipl_info.fcp.scp_data_len = scpdata_len;
734         reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN + scpdata_len;
735         reipl_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN + scpdata_len;
736 
737         return count;
738 }
739 static struct bin_attribute sys_reipl_fcp_scp_data_attr =
740         __BIN_ATTR(scp_data, (S_IRUGO | S_IWUSR), reipl_fcp_scpdata_read,
741                    reipl_fcp_scpdata_write, DIAG308_SCPDATA_SIZE);
742 
743 static struct bin_attribute *reipl_fcp_bin_attrs[] = {
744         &sys_reipl_fcp_scp_data_attr,
745         NULL,
746 };
747 
748 DEFINE_IPL_ATTR_RW(reipl_fcp, wwpn, "0x%016llx\n", "%llx\n",
749                    reipl_block_fcp->ipl_info.fcp.wwpn);
750 DEFINE_IPL_ATTR_RW(reipl_fcp, lun, "0x%016llx\n", "%llx\n",
751                    reipl_block_fcp->ipl_info.fcp.lun);
752 DEFINE_IPL_ATTR_RW(reipl_fcp, bootprog, "%lld\n", "%lld\n",
753                    reipl_block_fcp->ipl_info.fcp.bootprog);
754 DEFINE_IPL_ATTR_RW(reipl_fcp, br_lba, "%lld\n", "%lld\n",
755                    reipl_block_fcp->ipl_info.fcp.br_lba);
756 DEFINE_IPL_ATTR_RW(reipl_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
757                    reipl_block_fcp->ipl_info.fcp.devno);
758 
759 static void reipl_get_ascii_loadparm(char *loadparm,
760                                      struct ipl_parameter_block *ibp)
761 {
762         memcpy(loadparm, ibp->hdr.loadparm, LOADPARM_LEN);
763         EBCASC(loadparm, LOADPARM_LEN);
764         loadparm[LOADPARM_LEN] = 0;
765         strim(loadparm);
766 }
767 
768 static ssize_t reipl_generic_loadparm_show(struct ipl_parameter_block *ipb,
769                                            char *page)
770 {
771         char buf[LOADPARM_LEN + 1];
772 
773         reipl_get_ascii_loadparm(buf, ipb);
774         return sprintf(page, "%s\n", buf);
775 }
776 
777 static ssize_t reipl_generic_loadparm_store(struct ipl_parameter_block *ipb,
778                                             const char *buf, size_t len)
779 {
780         int i, lp_len;
781 
782         /* ignore trailing newline */
783         lp_len = len;
784         if ((len > 0) && (buf[len - 1] == '\n'))
785                 lp_len--;
786         /* loadparm can have max 8 characters and must not start with a blank */
787         if ((lp_len > LOADPARM_LEN) || ((lp_len > 0) && (buf[0] == ' ')))
788                 return -EINVAL;
789         /* loadparm can only contain "a-z,A-Z,0-9,SP,." */
790         for (i = 0; i < lp_len; i++) {
791                 if (isalpha(buf[i]) || isdigit(buf[i]) || (buf[i] == ' ') ||
792                     (buf[i] == '.'))
793                         continue;
794                 return -EINVAL;
795         }
796         /* initialize loadparm with blanks */
797         memset(ipb->hdr.loadparm, ' ', LOADPARM_LEN);
798         /* copy and convert to ebcdic */
799         memcpy(ipb->hdr.loadparm, buf, lp_len);
800         ASCEBC(ipb->hdr.loadparm, LOADPARM_LEN);
801         return len;
802 }
803 
804 /* FCP wrapper */
805 static ssize_t reipl_fcp_loadparm_show(struct kobject *kobj,
806                                        struct kobj_attribute *attr, char *page)
807 {
808         return reipl_generic_loadparm_show(reipl_block_fcp, page);
809 }
810 
811 static ssize_t reipl_fcp_loadparm_store(struct kobject *kobj,
812                                         struct kobj_attribute *attr,
813                                         const char *buf, size_t len)
814 {
815         return reipl_generic_loadparm_store(reipl_block_fcp, buf, len);
816 }
817 
818 static struct kobj_attribute sys_reipl_fcp_loadparm_attr =
819         __ATTR(loadparm, S_IRUGO | S_IWUSR, reipl_fcp_loadparm_show,
820                                             reipl_fcp_loadparm_store);
821 
822 static struct attribute *reipl_fcp_attrs[] = {
823         &sys_reipl_fcp_device_attr.attr,
824         &sys_reipl_fcp_wwpn_attr.attr,
825         &sys_reipl_fcp_lun_attr.attr,
826         &sys_reipl_fcp_bootprog_attr.attr,
827         &sys_reipl_fcp_br_lba_attr.attr,
828         &sys_reipl_fcp_loadparm_attr.attr,
829         NULL,
830 };
831 
832 static struct attribute_group reipl_fcp_attr_group = {
833         .attrs = reipl_fcp_attrs,
834         .bin_attrs = reipl_fcp_bin_attrs,
835 };
836 
837 /* CCW reipl device attributes */
838 DEFINE_IPL_CCW_ATTR_RW(reipl_ccw, device, reipl_block_ccw->ipl_info.ccw);
839 
840 /* NSS wrapper */
841 static ssize_t reipl_nss_loadparm_show(struct kobject *kobj,
842                                        struct kobj_attribute *attr, char *page)
843 {
844         return reipl_generic_loadparm_show(reipl_block_nss, page);
845 }
846 
847 static ssize_t reipl_nss_loadparm_store(struct kobject *kobj,
848                                         struct kobj_attribute *attr,
849                                         const char *buf, size_t len)
850 {
851         return reipl_generic_loadparm_store(reipl_block_nss, buf, len);
852 }
853 
854 /* CCW wrapper */
855 static ssize_t reipl_ccw_loadparm_show(struct kobject *kobj,
856                                        struct kobj_attribute *attr, char *page)
857 {
858         return reipl_generic_loadparm_show(reipl_block_ccw, page);
859 }
860 
861 static ssize_t reipl_ccw_loadparm_store(struct kobject *kobj,
862                                         struct kobj_attribute *attr,
863                                         const char *buf, size_t len)
864 {
865         return reipl_generic_loadparm_store(reipl_block_ccw, buf, len);
866 }
867 
868 static struct kobj_attribute sys_reipl_ccw_loadparm_attr =
869         __ATTR(loadparm, S_IRUGO | S_IWUSR, reipl_ccw_loadparm_show,
870                                             reipl_ccw_loadparm_store);
871 
872 static struct attribute *reipl_ccw_attrs_vm[] = {
873         &sys_reipl_ccw_device_attr.attr,
874         &sys_reipl_ccw_loadparm_attr.attr,
875         &sys_reipl_ccw_vmparm_attr.attr,
876         NULL,
877 };
878 
879 static struct attribute *reipl_ccw_attrs_lpar[] = {
880         &sys_reipl_ccw_device_attr.attr,
881         &sys_reipl_ccw_loadparm_attr.attr,
882         NULL,
883 };
884 
885 static struct attribute_group reipl_ccw_attr_group_vm = {
886         .name  = IPL_CCW_STR,
887         .attrs = reipl_ccw_attrs_vm,
888 };
889 
890 static struct attribute_group reipl_ccw_attr_group_lpar = {
891         .name  = IPL_CCW_STR,
892         .attrs = reipl_ccw_attrs_lpar,
893 };
894 
895 
896 /* NSS reipl device attributes */
897 static void reipl_get_ascii_nss_name(char *dst,
898                                      struct ipl_parameter_block *ipb)
899 {
900         memcpy(dst, ipb->ipl_info.ccw.nss_name, NSS_NAME_SIZE);
901         EBCASC(dst, NSS_NAME_SIZE);
902         dst[NSS_NAME_SIZE] = 0;
903 }
904 
905 static ssize_t reipl_nss_name_show(struct kobject *kobj,
906                                    struct kobj_attribute *attr, char *page)
907 {
908         char nss_name[NSS_NAME_SIZE + 1] = {};
909 
910         reipl_get_ascii_nss_name(nss_name, reipl_block_nss);
911         return sprintf(page, "%s\n", nss_name);
912 }
913 
914 static ssize_t reipl_nss_name_store(struct kobject *kobj,
915                                     struct kobj_attribute *attr,
916                                     const char *buf, size_t len)
917 {
918         int nss_len;
919 
920         /* ignore trailing newline */
921         nss_len = len;
922         if ((len > 0) && (buf[len - 1] == '\n'))
923                 nss_len--;
924 
925         if (nss_len > NSS_NAME_SIZE)
926                 return -EINVAL;
927 
928         memset(reipl_block_nss->ipl_info.ccw.nss_name, 0x40, NSS_NAME_SIZE);
929         if (nss_len > 0) {
930                 reipl_block_nss->ipl_info.ccw.vm_flags |=
931                         DIAG308_VM_FLAGS_NSS_VALID;
932                 memcpy(reipl_block_nss->ipl_info.ccw.nss_name, buf, nss_len);
933                 ASCEBC(reipl_block_nss->ipl_info.ccw.nss_name, nss_len);
934                 EBC_TOUPPER(reipl_block_nss->ipl_info.ccw.nss_name, nss_len);
935         } else {
936                 reipl_block_nss->ipl_info.ccw.vm_flags &=
937                         ~DIAG308_VM_FLAGS_NSS_VALID;
938         }
939 
940         return len;
941 }
942 
943 static struct kobj_attribute sys_reipl_nss_name_attr =
944         __ATTR(name, S_IRUGO | S_IWUSR, reipl_nss_name_show,
945                                         reipl_nss_name_store);
946 
947 static struct kobj_attribute sys_reipl_nss_loadparm_attr =
948         __ATTR(loadparm, S_IRUGO | S_IWUSR, reipl_nss_loadparm_show,
949                                             reipl_nss_loadparm_store);
950 
951 static struct attribute *reipl_nss_attrs[] = {
952         &sys_reipl_nss_name_attr.attr,
953         &sys_reipl_nss_loadparm_attr.attr,
954         &sys_reipl_nss_vmparm_attr.attr,
955         NULL,
956 };
957 
958 static struct attribute_group reipl_nss_attr_group = {
959         .name  = IPL_NSS_STR,
960         .attrs = reipl_nss_attrs,
961 };
962 
963 static void set_reipl_block_actual(struct ipl_parameter_block *reipl_block)
964 {
965         reipl_block_actual = reipl_block;
966         os_info_entry_add(OS_INFO_REIPL_BLOCK, reipl_block_actual,
967                           reipl_block->hdr.len);
968 }
969 
970 /* reipl type */
971 
972 static int reipl_set_type(enum ipl_type type)
973 {
974         if (!(reipl_capabilities & type))
975                 return -EINVAL;
976 
977         switch(type) {
978         case IPL_TYPE_CCW:
979                 if (diag308_set_works)
980                         reipl_method = REIPL_METHOD_CCW_DIAG;
981                 else if (MACHINE_IS_VM)
982                         reipl_method = REIPL_METHOD_CCW_VM;
983                 else
984                         reipl_method = REIPL_METHOD_CCW_CIO;
985                 set_reipl_block_actual(reipl_block_ccw);
986                 break;
987         case IPL_TYPE_FCP:
988                 if (diag308_set_works)
989                         reipl_method = REIPL_METHOD_FCP_RW_DIAG;
990                 else if (MACHINE_IS_VM)
991                         reipl_method = REIPL_METHOD_FCP_RO_VM;
992                 else
993                         reipl_method = REIPL_METHOD_FCP_RO_DIAG;
994                 set_reipl_block_actual(reipl_block_fcp);
995                 break;
996         case IPL_TYPE_FCP_DUMP:
997                 reipl_method = REIPL_METHOD_FCP_DUMP;
998                 break;
999         case IPL_TYPE_NSS:
1000                 if (diag308_set_works)
1001                         reipl_method = REIPL_METHOD_NSS_DIAG;
1002                 else
1003                         reipl_method = REIPL_METHOD_NSS;
1004                 set_reipl_block_actual(reipl_block_nss);
1005                 break;
1006         case IPL_TYPE_UNKNOWN:
1007                 reipl_method = REIPL_METHOD_DEFAULT;
1008                 break;
1009         default:
1010                 BUG();
1011         }
1012         reipl_type = type;
1013         return 0;
1014 }
1015 
1016 static ssize_t reipl_type_show(struct kobject *kobj,
1017                                struct kobj_attribute *attr, char *page)
1018 {
1019         return sprintf(page, "%s\n", ipl_type_str(reipl_type));
1020 }
1021 
1022 static ssize_t reipl_type_store(struct kobject *kobj,
1023                                 struct kobj_attribute *attr,
1024                                 const char *buf, size_t len)
1025 {
1026         int rc = -EINVAL;
1027 
1028         if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
1029                 rc = reipl_set_type(IPL_TYPE_CCW);
1030         else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
1031                 rc = reipl_set_type(IPL_TYPE_FCP);
1032         else if (strncmp(buf, IPL_NSS_STR, strlen(IPL_NSS_STR)) == 0)
1033                 rc = reipl_set_type(IPL_TYPE_NSS);
1034         return (rc != 0) ? rc : len;
1035 }
1036 
1037 static struct kobj_attribute reipl_type_attr =
1038         __ATTR(reipl_type, 0644, reipl_type_show, reipl_type_store);
1039 
1040 static struct kset *reipl_kset;
1041 static struct kset *reipl_fcp_kset;
1042 
1043 static void get_ipl_string(char *dst, struct ipl_parameter_block *ipb,
1044                            const enum ipl_method m)
1045 {
1046         char loadparm[LOADPARM_LEN + 1] = {};
1047         char vmparm[DIAG308_VMPARM_SIZE + 1] = {};
1048         char nss_name[NSS_NAME_SIZE + 1] = {};
1049         size_t pos = 0;
1050 
1051         reipl_get_ascii_loadparm(loadparm, ipb);
1052         reipl_get_ascii_nss_name(nss_name, ipb);
1053         reipl_get_ascii_vmparm(vmparm, sizeof(vmparm), ipb);
1054 
1055         switch (m) {
1056         case REIPL_METHOD_CCW_VM:
1057                 pos = sprintf(dst, "IPL %X CLEAR", ipb->ipl_info.ccw.devno);
1058                 break;
1059         case REIPL_METHOD_NSS:
1060                 pos = sprintf(dst, "IPL %s", nss_name);
1061                 break;
1062         default:
1063                 break;
1064         }
1065         if (strlen(loadparm) > 0)
1066                 pos += sprintf(dst + pos, " LOADPARM '%s'", loadparm);
1067         if (strlen(vmparm) > 0)
1068                 sprintf(dst + pos, " PARM %s", vmparm);
1069 }
1070 
1071 static void __reipl_run(void *unused)
1072 {
1073         struct ccw_dev_id devid;
1074         static char buf[128];
1075 
1076         switch (reipl_method) {
1077         case REIPL_METHOD_CCW_CIO:
1078                 devid.ssid  = reipl_block_ccw->ipl_info.ccw.ssid;
1079                 devid.devno = reipl_block_ccw->ipl_info.ccw.devno;
1080                 reipl_ccw_dev(&devid);
1081                 break;
1082         case REIPL_METHOD_CCW_VM:
1083                 get_ipl_string(buf, reipl_block_ccw, REIPL_METHOD_CCW_VM);
1084                 __cpcmd(buf, NULL, 0, NULL);
1085                 break;
1086         case REIPL_METHOD_CCW_DIAG:
1087                 diag308(DIAG308_SET, reipl_block_ccw);
1088                 diag308(DIAG308_IPL, NULL);
1089                 break;
1090         case REIPL_METHOD_FCP_RW_DIAG:
1091                 diag308(DIAG308_SET, reipl_block_fcp);
1092                 diag308(DIAG308_IPL, NULL);
1093                 break;
1094         case REIPL_METHOD_FCP_RO_DIAG:
1095                 diag308(DIAG308_IPL, NULL);
1096                 break;
1097         case REIPL_METHOD_FCP_RO_VM:
1098                 __cpcmd("IPL", NULL, 0, NULL);
1099                 break;
1100         case REIPL_METHOD_NSS_DIAG:
1101                 diag308(DIAG308_SET, reipl_block_nss);
1102                 diag308(DIAG308_IPL, NULL);
1103                 break;
1104         case REIPL_METHOD_NSS:
1105                 get_ipl_string(buf, reipl_block_nss, REIPL_METHOD_NSS);
1106                 __cpcmd(buf, NULL, 0, NULL);
1107                 break;
1108         case REIPL_METHOD_DEFAULT:
1109                 if (MACHINE_IS_VM)
1110                         __cpcmd("IPL", NULL, 0, NULL);
1111                 diag308(DIAG308_IPL, NULL);
1112                 break;
1113         case REIPL_METHOD_FCP_DUMP:
1114                 break;
1115         }
1116         disabled_wait((unsigned long) __builtin_return_address(0));
1117 }
1118 
1119 static void reipl_run(struct shutdown_trigger *trigger)
1120 {
1121         smp_call_ipl_cpu(__reipl_run, NULL);
1122 }
1123 
1124 static void reipl_block_ccw_init(struct ipl_parameter_block *ipb)
1125 {
1126         ipb->hdr.len = IPL_PARM_BLK_CCW_LEN;
1127         ipb->hdr.version = IPL_PARM_BLOCK_VERSION;
1128         ipb->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
1129         ipb->hdr.pbt = DIAG308_IPL_TYPE_CCW;
1130 }
1131 
1132 static void reipl_block_ccw_fill_parms(struct ipl_parameter_block *ipb)
1133 {
1134         /* LOADPARM */
1135         /* check if read scp info worked and set loadparm */
1136         if (sclp_ipl_info.is_valid)
1137                 memcpy(ipb->hdr.loadparm, &sclp_ipl_info.loadparm, LOADPARM_LEN);
1138         else
1139                 /* read scp info failed: set empty loadparm (EBCDIC blanks) */
1140                 memset(ipb->hdr.loadparm, 0x40, LOADPARM_LEN);
1141         ipb->hdr.flags = DIAG308_FLAGS_LP_VALID;
1142 
1143         /* VM PARM */
1144         if (MACHINE_IS_VM && diag308_set_works &&
1145             (ipl_block.ipl_info.ccw.vm_flags & DIAG308_VM_FLAGS_VP_VALID)) {
1146 
1147                 ipb->ipl_info.ccw.vm_flags |= DIAG308_VM_FLAGS_VP_VALID;
1148                 ipb->ipl_info.ccw.vm_parm_len =
1149                                         ipl_block.ipl_info.ccw.vm_parm_len;
1150                 memcpy(ipb->ipl_info.ccw.vm_parm,
1151                        ipl_block.ipl_info.ccw.vm_parm, DIAG308_VMPARM_SIZE);
1152         }
1153 }
1154 
1155 static int __init reipl_nss_init(void)
1156 {
1157         int rc;
1158 
1159         if (!MACHINE_IS_VM)
1160                 return 0;
1161 
1162         reipl_block_nss = (void *) get_zeroed_page(GFP_KERNEL);
1163         if (!reipl_block_nss)
1164                 return -ENOMEM;
1165 
1166         if (!diag308_set_works)
1167                 sys_reipl_nss_vmparm_attr.attr.mode = S_IRUGO;
1168 
1169         rc = sysfs_create_group(&reipl_kset->kobj, &reipl_nss_attr_group);
1170         if (rc)
1171                 return rc;
1172 
1173         reipl_block_ccw_init(reipl_block_nss);
1174         if (ipl_info.type == IPL_TYPE_NSS) {
1175                 memset(reipl_block_nss->ipl_info.ccw.nss_name,
1176                         ' ', NSS_NAME_SIZE);
1177                 memcpy(reipl_block_nss->ipl_info.ccw.nss_name,
1178                         kernel_nss_name, strlen(kernel_nss_name));
1179                 ASCEBC(reipl_block_nss->ipl_info.ccw.nss_name, NSS_NAME_SIZE);
1180                 reipl_block_nss->ipl_info.ccw.vm_flags |=
1181                         DIAG308_VM_FLAGS_NSS_VALID;
1182 
1183                 reipl_block_ccw_fill_parms(reipl_block_nss);
1184         }
1185 
1186         reipl_capabilities |= IPL_TYPE_NSS;
1187         return 0;
1188 }
1189 
1190 static int __init reipl_ccw_init(void)
1191 {
1192         int rc;
1193 
1194         reipl_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
1195         if (!reipl_block_ccw)
1196                 return -ENOMEM;
1197 
1198         if (MACHINE_IS_VM) {
1199                 if (!diag308_set_works)
1200                         sys_reipl_ccw_vmparm_attr.attr.mode = S_IRUGO;
1201                 rc = sysfs_create_group(&reipl_kset->kobj,
1202                                         &reipl_ccw_attr_group_vm);
1203         } else {
1204                 if(!diag308_set_works)
1205                         sys_reipl_ccw_loadparm_attr.attr.mode = S_IRUGO;
1206                 rc = sysfs_create_group(&reipl_kset->kobj,
1207                                         &reipl_ccw_attr_group_lpar);
1208         }
1209         if (rc)
1210                 return rc;
1211 
1212         reipl_block_ccw_init(reipl_block_ccw);
1213         if (ipl_info.type == IPL_TYPE_CCW) {
1214                 reipl_block_ccw->ipl_info.ccw.ssid = ipl_ssid;
1215                 reipl_block_ccw->ipl_info.ccw.devno = ipl_devno;
1216                 reipl_block_ccw_fill_parms(reipl_block_ccw);
1217         }
1218 
1219         reipl_capabilities |= IPL_TYPE_CCW;
1220         return 0;
1221 }
1222 
1223 static int __init reipl_fcp_init(void)
1224 {
1225         int rc;
1226 
1227         if (!diag308_set_works) {
1228                 if (ipl_info.type == IPL_TYPE_FCP) {
1229                         make_attrs_ro(reipl_fcp_attrs);
1230                         sys_reipl_fcp_scp_data_attr.attr.mode = S_IRUGO;
1231                 } else
1232                         return 0;
1233         }
1234 
1235         reipl_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
1236         if (!reipl_block_fcp)
1237                 return -ENOMEM;
1238 
1239         /* sysfs: create fcp kset for mixing attr group and bin attrs */
1240         reipl_fcp_kset = kset_create_and_add(IPL_FCP_STR, NULL,
1241                                              &reipl_kset->kobj);
1242         if (!reipl_fcp_kset) {
1243                 free_page((unsigned long) reipl_block_fcp);
1244                 return -ENOMEM;
1245         }
1246 
1247         rc = sysfs_create_group(&reipl_fcp_kset->kobj, &reipl_fcp_attr_group);
1248         if (rc) {
1249                 kset_unregister(reipl_fcp_kset);
1250                 free_page((unsigned long) reipl_block_fcp);
1251                 return rc;
1252         }
1253 
1254         if (ipl_info.type == IPL_TYPE_FCP) {
1255                 memcpy(reipl_block_fcp, IPL_PARMBLOCK_START, PAGE_SIZE);
1256                 /*
1257                  * Fix loadparm: There are systems where the (SCSI) LOADPARM
1258                  * is invalid in the SCSI IPL parameter block, so take it
1259                  * always from sclp_ipl_info.
1260                  */
1261                 memcpy(reipl_block_fcp->hdr.loadparm, sclp_ipl_info.loadparm,
1262                        LOADPARM_LEN);
1263         } else {
1264                 reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
1265                 reipl_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
1266                 reipl_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
1267                 reipl_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
1268                 reipl_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_IPL;
1269         }
1270         reipl_capabilities |= IPL_TYPE_FCP;
1271         return 0;
1272 }
1273 
1274 static int __init reipl_type_init(void)
1275 {
1276         enum ipl_type reipl_type = ipl_info.type;
1277         struct ipl_parameter_block *reipl_block;
1278         unsigned long size;
1279 
1280         reipl_block = os_info_old_entry(OS_INFO_REIPL_BLOCK, &size);
1281         if (!reipl_block)
1282                 goto out;
1283         /*
1284          * If we have an OS info reipl block, this will be used
1285          */
1286         if (reipl_block->hdr.pbt == DIAG308_IPL_TYPE_FCP) {
1287                 memcpy(reipl_block_fcp, reipl_block, size);
1288                 reipl_type = IPL_TYPE_FCP;
1289         } else if (reipl_block->hdr.pbt == DIAG308_IPL_TYPE_CCW) {
1290                 memcpy(reipl_block_ccw, reipl_block, size);
1291                 reipl_type = IPL_TYPE_CCW;
1292         }
1293 out:
1294         return reipl_set_type(reipl_type);
1295 }
1296 
1297 static int __init reipl_init(void)
1298 {
1299         int rc;
1300 
1301         reipl_kset = kset_create_and_add("reipl", NULL, firmware_kobj);
1302         if (!reipl_kset)
1303                 return -ENOMEM;
1304         rc = sysfs_create_file(&reipl_kset->kobj, &reipl_type_attr.attr);
1305         if (rc) {
1306                 kset_unregister(reipl_kset);
1307                 return rc;
1308         }
1309         rc = reipl_ccw_init();
1310         if (rc)
1311                 return rc;
1312         rc = reipl_fcp_init();
1313         if (rc)
1314                 return rc;
1315         rc = reipl_nss_init();
1316         if (rc)
1317                 return rc;
1318         return reipl_type_init();
1319 }
1320 
1321 static struct shutdown_action __refdata reipl_action = {
1322         .name   = SHUTDOWN_ACTION_REIPL_STR,
1323         .fn     = reipl_run,
1324         .init   = reipl_init,
1325 };
1326 
1327 /*
1328  * dump shutdown action: Dump Linux on shutdown.
1329  */
1330 
1331 /* FCP dump device attributes */
1332 
1333 DEFINE_IPL_ATTR_RW(dump_fcp, wwpn, "0x%016llx\n", "%llx\n",
1334                    dump_block_fcp->ipl_info.fcp.wwpn);
1335 DEFINE_IPL_ATTR_RW(dump_fcp, lun, "0x%016llx\n", "%llx\n",
1336                    dump_block_fcp->ipl_info.fcp.lun);
1337 DEFINE_IPL_ATTR_RW(dump_fcp, bootprog, "%lld\n", "%lld\n",
1338                    dump_block_fcp->ipl_info.fcp.bootprog);
1339 DEFINE_IPL_ATTR_RW(dump_fcp, br_lba, "%lld\n", "%lld\n",
1340                    dump_block_fcp->ipl_info.fcp.br_lba);
1341 DEFINE_IPL_ATTR_RW(dump_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
1342                    dump_block_fcp->ipl_info.fcp.devno);
1343 
1344 static struct attribute *dump_fcp_attrs[] = {
1345         &sys_dump_fcp_device_attr.attr,
1346         &sys_dump_fcp_wwpn_attr.attr,
1347         &sys_dump_fcp_lun_attr.attr,
1348         &sys_dump_fcp_bootprog_attr.attr,
1349         &sys_dump_fcp_br_lba_attr.attr,
1350         NULL,
1351 };
1352 
1353 static struct attribute_group dump_fcp_attr_group = {
1354         .name  = IPL_FCP_STR,
1355         .attrs = dump_fcp_attrs,
1356 };
1357 
1358 /* CCW dump device attributes */
1359 DEFINE_IPL_CCW_ATTR_RW(dump_ccw, device, dump_block_ccw->ipl_info.ccw);
1360 
1361 static struct attribute *dump_ccw_attrs[] = {
1362         &sys_dump_ccw_device_attr.attr,
1363         NULL,
1364 };
1365 
1366 static struct attribute_group dump_ccw_attr_group = {
1367         .name  = IPL_CCW_STR,
1368         .attrs = dump_ccw_attrs,
1369 };
1370 
1371 /* dump type */
1372 
1373 static int dump_set_type(enum dump_type type)
1374 {
1375         if (!(dump_capabilities & type))
1376                 return -EINVAL;
1377         switch (type) {
1378         case DUMP_TYPE_CCW:
1379                 if (diag308_set_works)
1380                         dump_method = DUMP_METHOD_CCW_DIAG;
1381                 else if (MACHINE_IS_VM)
1382                         dump_method = DUMP_METHOD_CCW_VM;
1383                 else
1384                         dump_method = DUMP_METHOD_CCW_CIO;
1385                 break;
1386         case DUMP_TYPE_FCP:
1387                 dump_method = DUMP_METHOD_FCP_DIAG;
1388                 break;
1389         default:
1390                 dump_method = DUMP_METHOD_NONE;
1391         }
1392         dump_type = type;
1393         return 0;
1394 }
1395 
1396 static ssize_t dump_type_show(struct kobject *kobj,
1397                               struct kobj_attribute *attr, char *page)
1398 {
1399         return sprintf(page, "%s\n", dump_type_str(dump_type));
1400 }
1401 
1402 static ssize_t dump_type_store(struct kobject *kobj,
1403                                struct kobj_attribute *attr,
1404                                const char *buf, size_t len)
1405 {
1406         int rc = -EINVAL;
1407 
1408         if (strncmp(buf, DUMP_NONE_STR, strlen(DUMP_NONE_STR)) == 0)
1409                 rc = dump_set_type(DUMP_TYPE_NONE);
1410         else if (strncmp(buf, DUMP_CCW_STR, strlen(DUMP_CCW_STR)) == 0)
1411                 rc = dump_set_type(DUMP_TYPE_CCW);
1412         else if (strncmp(buf, DUMP_FCP_STR, strlen(DUMP_FCP_STR)) == 0)
1413                 rc = dump_set_type(DUMP_TYPE_FCP);
1414         return (rc != 0) ? rc : len;
1415 }
1416 
1417 static struct kobj_attribute dump_type_attr =
1418         __ATTR(dump_type, 0644, dump_type_show, dump_type_store);
1419 
1420 static struct kset *dump_kset;
1421 
1422 static void diag308_dump(void *dump_block)
1423 {
1424         diag308(DIAG308_SET, dump_block);
1425         while (1) {
1426                 if (diag308(DIAG308_DUMP, NULL) != 0x302)
1427                         break;
1428                 udelay_simple(USEC_PER_SEC);
1429         }
1430 }
1431 
1432 static void __dump_run(void *unused)
1433 {
1434         struct ccw_dev_id devid;
1435         static char buf[100];
1436 
1437         switch (dump_method) {
1438         case DUMP_METHOD_CCW_CIO:
1439                 devid.ssid  = dump_block_ccw->ipl_info.ccw.ssid;
1440                 devid.devno = dump_block_ccw->ipl_info.ccw.devno;
1441                 reipl_ccw_dev(&devid);
1442                 break;
1443         case DUMP_METHOD_CCW_VM:
1444                 sprintf(buf, "STORE STATUS");
1445                 __cpcmd(buf, NULL, 0, NULL);
1446                 sprintf(buf, "IPL %X", dump_block_ccw->ipl_info.ccw.devno);
1447                 __cpcmd(buf, NULL, 0, NULL);
1448                 break;
1449         case DUMP_METHOD_CCW_DIAG:
1450                 diag308_dump(dump_block_ccw);
1451                 break;
1452         case DUMP_METHOD_FCP_DIAG:
1453                 diag308_dump(dump_block_fcp);
1454                 break;
1455         default:
1456                 break;
1457         }
1458 }
1459 
1460 static void dump_run(struct shutdown_trigger *trigger)
1461 {
1462         if (dump_method == DUMP_METHOD_NONE)
1463                 return;
1464         smp_send_stop();
1465         smp_call_ipl_cpu(__dump_run, NULL);
1466 }
1467 
1468 static int __init dump_ccw_init(void)
1469 {
1470         int rc;
1471 
1472         dump_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
1473         if (!dump_block_ccw)
1474                 return -ENOMEM;
1475         rc = sysfs_create_group(&dump_kset->kobj, &dump_ccw_attr_group);
1476         if (rc) {
1477                 free_page((unsigned long)dump_block_ccw);
1478                 return rc;
1479         }
1480         dump_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
1481         dump_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
1482         dump_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
1483         dump_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
1484         dump_capabilities |= DUMP_TYPE_CCW;
1485         return 0;
1486 }
1487 
1488 static int __init dump_fcp_init(void)
1489 {
1490         int rc;
1491 
1492         if (!sclp_ipl_info.has_dump)
1493                 return 0; /* LDIPL DUMP is not installed */
1494         if (!diag308_set_works)
1495                 return 0;
1496         dump_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
1497         if (!dump_block_fcp)
1498                 return -ENOMEM;
1499         rc = sysfs_create_group(&dump_kset->kobj, &dump_fcp_attr_group);
1500         if (rc) {
1501                 free_page((unsigned long)dump_block_fcp);
1502                 return rc;
1503         }
1504         dump_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
1505         dump_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
1506         dump_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
1507         dump_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
1508         dump_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_DUMP;
1509         dump_capabilities |= DUMP_TYPE_FCP;
1510         return 0;
1511 }
1512 
1513 static int __init dump_init(void)
1514 {
1515         int rc;
1516 
1517         dump_kset = kset_create_and_add("dump", NULL, firmware_kobj);
1518         if (!dump_kset)
1519                 return -ENOMEM;
1520         rc = sysfs_create_file(&dump_kset->kobj, &dump_type_attr.attr);
1521         if (rc) {
1522                 kset_unregister(dump_kset);
1523                 return rc;
1524         }
1525         rc = dump_ccw_init();
1526         if (rc)
1527                 return rc;
1528         rc = dump_fcp_init();
1529         if (rc)
1530                 return rc;
1531         dump_set_type(DUMP_TYPE_NONE);
1532         return 0;
1533 }
1534 
1535 static struct shutdown_action __refdata dump_action = {
1536         .name   = SHUTDOWN_ACTION_DUMP_STR,
1537         .fn     = dump_run,
1538         .init   = dump_init,
1539 };
1540 
1541 static void dump_reipl_run(struct shutdown_trigger *trigger)
1542 {
1543         unsigned long ipib = (unsigned long) reipl_block_actual;
1544         unsigned int csum;
1545 
1546         csum = csum_partial(reipl_block_actual, reipl_block_actual->hdr.len, 0);
1547         mem_assign_absolute(S390_lowcore.ipib, ipib);
1548         mem_assign_absolute(S390_lowcore.ipib_checksum, csum);
1549         dump_run(trigger);
1550 }
1551 
1552 static int __init dump_reipl_init(void)
1553 {
1554         if (!diag308_set_works)
1555                 return -EOPNOTSUPP;
1556         else
1557                 return 0;
1558 }
1559 
1560 static struct shutdown_action __refdata dump_reipl_action = {
1561         .name   = SHUTDOWN_ACTION_DUMP_REIPL_STR,
1562         .fn     = dump_reipl_run,
1563         .init   = dump_reipl_init,
1564 };
1565 
1566 /*
1567  * vmcmd shutdown action: Trigger vm command on shutdown.
1568  */
1569 
1570 static char vmcmd_on_reboot[128];
1571 static char vmcmd_on_panic[128];
1572 static char vmcmd_on_halt[128];
1573 static char vmcmd_on_poff[128];
1574 static char vmcmd_on_restart[128];
1575 
1576 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_reboot, "%s\n", "%s\n", vmcmd_on_reboot);
1577 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_panic, "%s\n", "%s\n", vmcmd_on_panic);
1578 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_halt, "%s\n", "%s\n", vmcmd_on_halt);
1579 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_poff, "%s\n", "%s\n", vmcmd_on_poff);
1580 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_restart, "%s\n", "%s\n", vmcmd_on_restart);
1581 
1582 static struct attribute *vmcmd_attrs[] = {
1583         &sys_vmcmd_on_reboot_attr.attr,
1584         &sys_vmcmd_on_panic_attr.attr,
1585         &sys_vmcmd_on_halt_attr.attr,
1586         &sys_vmcmd_on_poff_attr.attr,
1587         &sys_vmcmd_on_restart_attr.attr,
1588         NULL,
1589 };
1590 
1591 static struct attribute_group vmcmd_attr_group = {
1592         .attrs = vmcmd_attrs,
1593 };
1594 
1595 static struct kset *vmcmd_kset;
1596 
1597 static void vmcmd_run(struct shutdown_trigger *trigger)
1598 {
1599         char *cmd;
1600 
1601         if (strcmp(trigger->name, ON_REIPL_STR) == 0)
1602                 cmd = vmcmd_on_reboot;
1603         else if (strcmp(trigger->name, ON_PANIC_STR) == 0)
1604                 cmd = vmcmd_on_panic;
1605         else if (strcmp(trigger->name, ON_HALT_STR) == 0)
1606                 cmd = vmcmd_on_halt;
1607         else if (strcmp(trigger->name, ON_POFF_STR) == 0)
1608                 cmd = vmcmd_on_poff;
1609         else if (strcmp(trigger->name, ON_RESTART_STR) == 0)
1610                 cmd = vmcmd_on_restart;
1611         else
1612                 return;
1613 
1614         if (strlen(cmd) == 0)
1615                 return;
1616         __cpcmd(cmd, NULL, 0, NULL);
1617 }
1618 
1619 static int vmcmd_init(void)
1620 {
1621         if (!MACHINE_IS_VM)
1622                 return -EOPNOTSUPP;
1623         vmcmd_kset = kset_create_and_add("vmcmd", NULL, firmware_kobj);
1624         if (!vmcmd_kset)
1625                 return -ENOMEM;
1626         return sysfs_create_group(&vmcmd_kset->kobj, &vmcmd_attr_group);
1627 }
1628 
1629 static struct shutdown_action vmcmd_action = {SHUTDOWN_ACTION_VMCMD_STR,
1630                                               vmcmd_run, vmcmd_init};
1631 
1632 /*
1633  * stop shutdown action: Stop Linux on shutdown.
1634  */
1635 
1636 static void stop_run(struct shutdown_trigger *trigger)
1637 {
1638         if (strcmp(trigger->name, ON_PANIC_STR) == 0 ||
1639             strcmp(trigger->name, ON_RESTART_STR) == 0)
1640                 disabled_wait((unsigned long) __builtin_return_address(0));
1641         smp_stop_cpu();
1642 }
1643 
1644 static struct shutdown_action stop_action = {SHUTDOWN_ACTION_STOP_STR,
1645                                              stop_run, NULL};
1646 
1647 /* action list */
1648 
1649 static struct shutdown_action *shutdown_actions_list[] = {
1650         &ipl_action, &reipl_action, &dump_reipl_action, &dump_action,
1651         &vmcmd_action, &stop_action};
1652 #define SHUTDOWN_ACTIONS_COUNT (sizeof(shutdown_actions_list) / sizeof(void *))
1653 
1654 /*
1655  * Trigger section
1656  */
1657 
1658 static struct kset *shutdown_actions_kset;
1659 
1660 static int set_trigger(const char *buf, struct shutdown_trigger *trigger,
1661                        size_t len)
1662 {
1663         int i;
1664 
1665         for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
1666                 if (sysfs_streq(buf, shutdown_actions_list[i]->name)) {
1667                         if (shutdown_actions_list[i]->init_rc) {
1668                                 return shutdown_actions_list[i]->init_rc;
1669                         } else {
1670                                 trigger->action = shutdown_actions_list[i];
1671                                 return len;
1672                         }
1673                 }
1674         }
1675         return -EINVAL;
1676 }
1677 
1678 /* on reipl */
1679 
1680 static struct shutdown_trigger on_reboot_trigger = {ON_REIPL_STR,
1681                                                     &reipl_action};
1682 
1683 static ssize_t on_reboot_show(struct kobject *kobj,
1684                               struct kobj_attribute *attr, char *page)
1685 {
1686         return sprintf(page, "%s\n", on_reboot_trigger.action->name);
1687 }
1688 
1689 static ssize_t on_reboot_store(struct kobject *kobj,
1690                                struct kobj_attribute *attr,
1691                                const char *buf, size_t len)
1692 {
1693         return set_trigger(buf, &on_reboot_trigger, len);
1694 }
1695 static struct kobj_attribute on_reboot_attr = __ATTR_RW(on_reboot);
1696 
1697 static void do_machine_restart(char *__unused)
1698 {
1699         smp_send_stop();
1700         on_reboot_trigger.action->fn(&on_reboot_trigger);
1701         reipl_run(NULL);
1702 }
1703 void (*_machine_restart)(char *command) = do_machine_restart;
1704 
1705 /* on panic */
1706 
1707 static struct shutdown_trigger on_panic_trigger = {ON_PANIC_STR, &stop_action};
1708 
1709 static ssize_t on_panic_show(struct kobject *kobj,
1710                              struct kobj_attribute *attr, char *page)
1711 {
1712         return sprintf(page, "%s\n", on_panic_trigger.action->name);
1713 }
1714 
1715 static ssize_t on_panic_store(struct kobject *kobj,
1716                               struct kobj_attribute *attr,
1717                               const char *buf, size_t len)
1718 {
1719         return set_trigger(buf, &on_panic_trigger, len);
1720 }
1721 static struct kobj_attribute on_panic_attr = __ATTR_RW(on_panic);
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 static struct kobj_attribute on_restart_attr = __ATTR_RW(on_restart);
1748 
1749 static void __do_restart(void *ignore)
1750 {
1751         __arch_local_irq_stosm(0x04); /* enable DAT */
1752         smp_send_stop();
1753 #ifdef CONFIG_CRASH_DUMP
1754         crash_kexec(NULL);
1755 #endif
1756         on_restart_trigger.action->fn(&on_restart_trigger);
1757         stop_run(&on_restart_trigger);
1758 }
1759 
1760 void do_restart(void)
1761 {
1762         tracing_off();
1763         debug_locks_off();
1764         lgr_info_log();
1765         smp_call_online_cpu(__do_restart, NULL);
1766 }
1767 
1768 /* on halt */
1769 
1770 static struct shutdown_trigger on_halt_trigger = {ON_HALT_STR, &stop_action};
1771 
1772 static ssize_t on_halt_show(struct kobject *kobj,
1773                             struct kobj_attribute *attr, char *page)
1774 {
1775         return sprintf(page, "%s\n", on_halt_trigger.action->name);
1776 }
1777 
1778 static ssize_t on_halt_store(struct kobject *kobj,
1779                              struct kobj_attribute *attr,
1780                              const char *buf, size_t len)
1781 {
1782         return set_trigger(buf, &on_halt_trigger, len);
1783 }
1784 static struct kobj_attribute on_halt_attr = __ATTR_RW(on_halt);
1785 
1786 static void do_machine_halt(void)
1787 {
1788         smp_send_stop();
1789         on_halt_trigger.action->fn(&on_halt_trigger);
1790         stop_run(&on_halt_trigger);
1791 }
1792 void (*_machine_halt)(void) = do_machine_halt;
1793 
1794 /* on power off */
1795 
1796 static struct shutdown_trigger on_poff_trigger = {ON_POFF_STR, &stop_action};
1797 
1798 static ssize_t on_poff_show(struct kobject *kobj,
1799                             struct kobj_attribute *attr, char *page)
1800 {
1801         return sprintf(page, "%s\n", on_poff_trigger.action->name);
1802 }
1803 
1804 static ssize_t on_poff_store(struct kobject *kobj,
1805                              struct kobj_attribute *attr,
1806                              const char *buf, size_t len)
1807 {
1808         return set_trigger(buf, &on_poff_trigger, len);
1809 }
1810 static struct kobj_attribute on_poff_attr = __ATTR_RW(on_poff);
1811 
1812 static void do_machine_power_off(void)
1813 {
1814         smp_send_stop();
1815         on_poff_trigger.action->fn(&on_poff_trigger);
1816         stop_run(&on_poff_trigger);
1817 }
1818 void (*_machine_power_off)(void) = do_machine_power_off;
1819 
1820 static struct attribute *shutdown_action_attrs[] = {
1821         &on_restart_attr.attr,
1822         &on_reboot_attr.attr,
1823         &on_panic_attr.attr,
1824         &on_halt_attr.attr,
1825         &on_poff_attr.attr,
1826         NULL,
1827 };
1828 
1829 static struct attribute_group shutdown_action_attr_group = {
1830         .attrs = shutdown_action_attrs,
1831 };
1832 
1833 static void __init shutdown_triggers_init(void)
1834 {
1835         shutdown_actions_kset = kset_create_and_add("shutdown_actions", NULL,
1836                                                     firmware_kobj);
1837         if (!shutdown_actions_kset)
1838                 goto fail;
1839         if (sysfs_create_group(&shutdown_actions_kset->kobj,
1840                                &shutdown_action_attr_group))
1841                 goto fail;
1842         return;
1843 fail:
1844         panic("shutdown_triggers_init failed\n");
1845 }
1846 
1847 static void __init shutdown_actions_init(void)
1848 {
1849         int i;
1850 
1851         for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
1852                 if (!shutdown_actions_list[i]->init)
1853                         continue;
1854                 shutdown_actions_list[i]->init_rc =
1855                         shutdown_actions_list[i]->init();
1856         }
1857 }
1858 
1859 static int __init s390_ipl_init(void)
1860 {
1861         char str[8] = {0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40};
1862 
1863         sclp_get_ipl_info(&sclp_ipl_info);
1864         /*
1865          * Fix loadparm: There are systems where the (SCSI) LOADPARM
1866          * returned by read SCP info is invalid (contains EBCDIC blanks)
1867          * when the system has been booted via diag308. In that case we use
1868          * the value from diag308, if available.
1869          *
1870          * There are also systems where diag308 store does not work in
1871          * case the system is booted from HMC. Fortunately in this case
1872          * READ SCP info provides the correct value.
1873          */
1874         if (memcmp(sclp_ipl_info.loadparm, str, sizeof(str)) == 0 &&
1875             diag308_set_works)
1876                 memcpy(sclp_ipl_info.loadparm, ipl_block.hdr.loadparm,
1877                        LOADPARM_LEN);
1878         shutdown_actions_init();
1879         shutdown_triggers_init();
1880         return 0;
1881 }
1882 
1883 __initcall(s390_ipl_init);
1884 
1885 static void __init strncpy_skip_quote(char *dst, char *src, int n)
1886 {
1887         int sx, dx;
1888 
1889         dx = 0;
1890         for (sx = 0; src[sx] != 0; sx++) {
1891                 if (src[sx] == '"')
1892                         continue;
1893                 dst[dx++] = src[sx];
1894                 if (dx >= n)
1895                         break;
1896         }
1897 }
1898 
1899 static int __init vmcmd_on_reboot_setup(char *str)
1900 {
1901         if (!MACHINE_IS_VM)
1902                 return 1;
1903         strncpy_skip_quote(vmcmd_on_reboot, str, 127);
1904         vmcmd_on_reboot[127] = 0;
1905         on_reboot_trigger.action = &vmcmd_action;
1906         return 1;
1907 }
1908 __setup("vmreboot=", vmcmd_on_reboot_setup);
1909 
1910 static int __init vmcmd_on_panic_setup(char *str)
1911 {
1912         if (!MACHINE_IS_VM)
1913                 return 1;
1914         strncpy_skip_quote(vmcmd_on_panic, str, 127);
1915         vmcmd_on_panic[127] = 0;
1916         on_panic_trigger.action = &vmcmd_action;
1917         return 1;
1918 }
1919 __setup("vmpanic=", vmcmd_on_panic_setup);
1920 
1921 static int __init vmcmd_on_halt_setup(char *str)
1922 {
1923         if (!MACHINE_IS_VM)
1924                 return 1;
1925         strncpy_skip_quote(vmcmd_on_halt, str, 127);
1926         vmcmd_on_halt[127] = 0;
1927         on_halt_trigger.action = &vmcmd_action;
1928         return 1;
1929 }
1930 __setup("vmhalt=", vmcmd_on_halt_setup);
1931 
1932 static int __init vmcmd_on_poff_setup(char *str)
1933 {
1934         if (!MACHINE_IS_VM)
1935                 return 1;
1936         strncpy_skip_quote(vmcmd_on_poff, str, 127);
1937         vmcmd_on_poff[127] = 0;
1938         on_poff_trigger.action = &vmcmd_action;
1939         return 1;
1940 }
1941 __setup("vmpoff=", vmcmd_on_poff_setup);
1942 
1943 static int on_panic_notify(struct notifier_block *self,
1944                            unsigned long event, void *data)
1945 {
1946         do_panic();
1947         return NOTIFY_OK;
1948 }
1949 
1950 static struct notifier_block on_panic_nb = {
1951         .notifier_call = on_panic_notify,
1952         .priority = INT_MIN,
1953 };
1954 
1955 void __init setup_ipl(void)
1956 {
1957         ipl_info.type = get_ipl_type();
1958         switch (ipl_info.type) {
1959         case IPL_TYPE_CCW:
1960                 ipl_info.data.ccw.dev_id.ssid = ipl_ssid;
1961                 ipl_info.data.ccw.dev_id.devno = ipl_devno;
1962                 break;
1963         case IPL_TYPE_FCP:
1964         case IPL_TYPE_FCP_DUMP:
1965                 ipl_info.data.fcp.dev_id.ssid = 0;
1966                 ipl_info.data.fcp.dev_id.devno =
1967                         IPL_PARMBLOCK_START->ipl_info.fcp.devno;
1968                 ipl_info.data.fcp.wwpn = IPL_PARMBLOCK_START->ipl_info.fcp.wwpn;
1969                 ipl_info.data.fcp.lun = IPL_PARMBLOCK_START->ipl_info.fcp.lun;
1970                 break;
1971         case IPL_TYPE_NSS:
1972                 strncpy(ipl_info.data.nss.name, kernel_nss_name,
1973                         sizeof(ipl_info.data.nss.name));
1974                 break;
1975         case IPL_TYPE_UNKNOWN:
1976                 /* We have no info to copy */
1977                 break;
1978         }
1979         atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
1980 }
1981 
1982 void __init ipl_update_parameters(void)
1983 {
1984         int rc;
1985 
1986         rc = diag308(DIAG308_STORE, &ipl_block);
1987         if ((rc == DIAG308_RC_OK) || (rc == DIAG308_RC_NOCONFIG))
1988                 diag308_set_works = 1;
1989 }
1990 
1991 void __init ipl_save_parameters(void)
1992 {
1993         struct cio_iplinfo iplinfo;
1994         void *src, *dst;
1995 
1996         if (cio_get_iplinfo(&iplinfo))
1997                 return;
1998 
1999         ipl_ssid = iplinfo.ssid;
2000         ipl_devno = iplinfo.devno;
2001         ipl_flags |= IPL_DEVNO_VALID;
2002         if (!iplinfo.is_qdio)
2003                 return;
2004         ipl_flags |= IPL_PARMBLOCK_VALID;
2005         src = (void *)(unsigned long)S390_lowcore.ipl_parmblock_ptr;
2006         dst = (void *)IPL_PARMBLOCK_ORIGIN;
2007         memmove(dst, src, PAGE_SIZE);
2008         S390_lowcore.ipl_parmblock_ptr = IPL_PARMBLOCK_ORIGIN;
2009 }
2010 
2011 static LIST_HEAD(rcall);
2012 static DEFINE_MUTEX(rcall_mutex);
2013 
2014 void register_reset_call(struct reset_call *reset)
2015 {
2016         mutex_lock(&rcall_mutex);
2017         list_add(&reset->list, &rcall);
2018         mutex_unlock(&rcall_mutex);
2019 }
2020 EXPORT_SYMBOL_GPL(register_reset_call);
2021 
2022 void unregister_reset_call(struct reset_call *reset)
2023 {
2024         mutex_lock(&rcall_mutex);
2025         list_del(&reset->list);
2026         mutex_unlock(&rcall_mutex);
2027 }
2028 EXPORT_SYMBOL_GPL(unregister_reset_call);
2029 
2030 static void do_reset_calls(void)
2031 {
2032         struct reset_call *reset;
2033 
2034         if (diag308_set_works) {
2035                 diag308_reset();
2036                 return;
2037         }
2038         list_for_each_entry(reset, &rcall, list)
2039                 reset->fn();
2040 }
2041 
2042 void s390_reset_system(void)
2043 {
2044         struct lowcore *lc;
2045 
2046         lc = (struct lowcore *)(unsigned long) store_prefix();
2047 
2048         /* Stack for interrupt/machine check handler */
2049         lc->panic_stack = S390_lowcore.panic_stack;
2050 
2051         /* Disable prefixing */
2052         set_prefix(0);
2053 
2054         /* Disable lowcore protection */
2055         __ctl_clear_bit(0,28);
2056 
2057         /* Set new machine check handler */
2058         S390_lowcore.mcck_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT;
2059         S390_lowcore.mcck_new_psw.addr =
2060                 (unsigned long) s390_base_mcck_handler;
2061 
2062         /* Set new program check handler */
2063         S390_lowcore.program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT;
2064         S390_lowcore.program_new_psw.addr =
2065                 (unsigned long) s390_base_pgm_handler;
2066 
2067         do_reset_calls();
2068 }
2069 

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