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1// SPDX-License-Identifier: GPL-2.0
2/*
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/export.h>
13#include <linux/init.h>
14#include <linux/device.h>
15#include <linux/delay.h>
16#include <linux/reboot.h>
17#include <linux/ctype.h>
18#include <linux/fs.h>
19#include <linux/gfp.h>
20#include <linux/crash_dump.h>
21#include <linux/debug_locks.h>
22#include <asm/diag.h>
23#include <asm/ipl.h>
24#include <asm/smp.h>
25#include <asm/setup.h>
26#include <asm/cpcmd.h>
27#include <asm/ebcdic.h>
28#include <asm/sclp.h>
29#include <asm/checksum.h>
30#include <asm/debug.h>
31#include <asm/os_info.h>
32#include <asm/sections.h>
33#include <asm/boot_data.h>
34#include "entry.h"
35
36#define IPL_PARM_BLOCK_VERSION 0
37
38#define IPL_UNKNOWN_STR "unknown"
39#define IPL_CCW_STR "ccw"
40#define IPL_FCP_STR "fcp"
41#define IPL_FCP_DUMP_STR "fcp_dump"
42#define IPL_NSS_STR "nss"
43
44#define DUMP_CCW_STR "ccw"
45#define DUMP_FCP_STR "fcp"
46#define DUMP_NONE_STR "none"
47
48/*
49 * Four shutdown trigger types are supported:
50 * - panic
51 * - halt
52 * - power off
53 * - reipl
54 * - restart
55 */
56#define ON_PANIC_STR "on_panic"
57#define ON_HALT_STR "on_halt"
58#define ON_POFF_STR "on_poff"
59#define ON_REIPL_STR "on_reboot"
60#define ON_RESTART_STR "on_restart"
61
62struct shutdown_action;
63struct shutdown_trigger {
64 char *name;
65 struct shutdown_action *action;
66};
67
68/*
69 * The following shutdown action types are supported:
70 */
71#define SHUTDOWN_ACTION_IPL_STR "ipl"
72#define SHUTDOWN_ACTION_REIPL_STR "reipl"
73#define SHUTDOWN_ACTION_DUMP_STR "dump"
74#define SHUTDOWN_ACTION_VMCMD_STR "vmcmd"
75#define SHUTDOWN_ACTION_STOP_STR "stop"
76#define SHUTDOWN_ACTION_DUMP_REIPL_STR "dump_reipl"
77
78struct shutdown_action {
79 char *name;
80 void (*fn) (struct shutdown_trigger *trigger);
81 int (*init) (void);
82 int init_rc;
83};
84
85static char *ipl_type_str(enum ipl_type type)
86{
87 switch (type) {
88 case IPL_TYPE_CCW:
89 return IPL_CCW_STR;
90 case IPL_TYPE_FCP:
91 return IPL_FCP_STR;
92 case IPL_TYPE_FCP_DUMP:
93 return IPL_FCP_DUMP_STR;
94 case IPL_TYPE_NSS:
95 return IPL_NSS_STR;
96 case IPL_TYPE_UNKNOWN:
97 default:
98 return IPL_UNKNOWN_STR;
99 }
100}
101
102enum dump_type {
103 DUMP_TYPE_NONE = 1,
104 DUMP_TYPE_CCW = 2,
105 DUMP_TYPE_FCP = 4,
106};
107
108static char *dump_type_str(enum dump_type type)
109{
110 switch (type) {
111 case DUMP_TYPE_NONE:
112 return DUMP_NONE_STR;
113 case DUMP_TYPE_CCW:
114 return DUMP_CCW_STR;
115 case DUMP_TYPE_FCP:
116 return DUMP_FCP_STR;
117 default:
118 return NULL;
119 }
120}
121
122int __bootdata_preserved(ipl_block_valid);
123struct ipl_parameter_block __bootdata_preserved(ipl_block);
124int __bootdata_preserved(ipl_secure_flag);
125
126unsigned long __bootdata_preserved(ipl_cert_list_addr);
127unsigned long __bootdata_preserved(ipl_cert_list_size);
128
129unsigned long __bootdata(early_ipl_comp_list_addr);
130unsigned long __bootdata(early_ipl_comp_list_size);
131
132static int reipl_capabilities = IPL_TYPE_UNKNOWN;
133
134static enum ipl_type reipl_type = IPL_TYPE_UNKNOWN;
135static struct ipl_parameter_block *reipl_block_fcp;
136static struct ipl_parameter_block *reipl_block_ccw;
137static struct ipl_parameter_block *reipl_block_nss;
138static struct ipl_parameter_block *reipl_block_actual;
139
140static int dump_capabilities = DUMP_TYPE_NONE;
141static enum dump_type dump_type = DUMP_TYPE_NONE;
142static struct ipl_parameter_block *dump_block_fcp;
143static struct ipl_parameter_block *dump_block_ccw;
144
145static struct sclp_ipl_info sclp_ipl_info;
146
147static inline int __diag308(unsigned long subcode, void *addr)
148{
149 register unsigned long _addr asm("0") = (unsigned long) addr;
150 register unsigned long _rc asm("1") = 0;
151
152 asm volatile(
153 " diag %0,%2,0x308\n"
154 "0: nopr %%r7\n"
155 EX_TABLE(0b,0b)
156 : "+d" (_addr), "+d" (_rc)
157 : "d" (subcode) : "cc", "memory");
158 return _rc;
159}
160
161int diag308(unsigned long subcode, void *addr)
162{
163 if (IS_ENABLED(CONFIG_KASAN))
164 __arch_local_irq_stosm(0x04); /* enable DAT */
165 diag_stat_inc(DIAG_STAT_X308);
166 return __diag308(subcode, addr);
167}
168EXPORT_SYMBOL_GPL(diag308);
169
170/* SYSFS */
171
172#define IPL_ATTR_SHOW_FN(_prefix, _name, _format, args...) \
173static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj, \
174 struct kobj_attribute *attr, \
175 char *page) \
176{ \
177 return snprintf(page, PAGE_SIZE, _format, ##args); \
178}
179
180#define IPL_ATTR_CCW_STORE_FN(_prefix, _name, _ipl_blk) \
181static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj, \
182 struct kobj_attribute *attr, \
183 const char *buf, size_t len) \
184{ \
185 unsigned long long ssid, devno; \
186 \
187 if (sscanf(buf, "0.%llx.%llx\n", &ssid, &devno) != 2) \
188 return -EINVAL; \
189 \
190 if (ssid > __MAX_SSID || devno > __MAX_SUBCHANNEL) \
191 return -EINVAL; \
192 \
193 _ipl_blk.ssid = ssid; \
194 _ipl_blk.devno = devno; \
195 return len; \
196}
197
198#define DEFINE_IPL_CCW_ATTR_RW(_prefix, _name, _ipl_blk) \
199IPL_ATTR_SHOW_FN(_prefix, _name, "0.%x.%04x\n", \
200 _ipl_blk.ssid, _ipl_blk.devno); \
201IPL_ATTR_CCW_STORE_FN(_prefix, _name, _ipl_blk); \
202static struct kobj_attribute sys_##_prefix##_##_name##_attr = \
203 __ATTR(_name, (S_IRUGO | S_IWUSR), \
204 sys_##_prefix##_##_name##_show, \
205 sys_##_prefix##_##_name##_store) \
206
207#define DEFINE_IPL_ATTR_RO(_prefix, _name, _format, _value) \
208IPL_ATTR_SHOW_FN(_prefix, _name, _format, _value) \
209static struct kobj_attribute sys_##_prefix##_##_name##_attr = \
210 __ATTR(_name, S_IRUGO, sys_##_prefix##_##_name##_show, NULL)
211
212#define DEFINE_IPL_ATTR_RW(_prefix, _name, _fmt_out, _fmt_in, _value) \
213IPL_ATTR_SHOW_FN(_prefix, _name, _fmt_out, (unsigned long long) _value) \
214static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj, \
215 struct kobj_attribute *attr, \
216 const char *buf, size_t len) \
217{ \
218 unsigned long long value; \
219 if (sscanf(buf, _fmt_in, &value) != 1) \
220 return -EINVAL; \
221 _value = value; \
222 return len; \
223} \
224static struct kobj_attribute sys_##_prefix##_##_name##_attr = \
225 __ATTR(_name,(S_IRUGO | S_IWUSR), \
226 sys_##_prefix##_##_name##_show, \
227 sys_##_prefix##_##_name##_store)
228
229#define DEFINE_IPL_ATTR_STR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)\
230IPL_ATTR_SHOW_FN(_prefix, _name, _fmt_out, _value) \
231static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj, \
232 struct kobj_attribute *attr, \
233 const char *buf, size_t len) \
234{ \
235 strncpy(_value, buf, sizeof(_value) - 1); \
236 strim(_value); \
237 return len; \
238} \
239static struct kobj_attribute sys_##_prefix##_##_name##_attr = \
240 __ATTR(_name,(S_IRUGO | S_IWUSR), \
241 sys_##_prefix##_##_name##_show, \
242 sys_##_prefix##_##_name##_store)
243
244/*
245 * ipl section
246 */
247
248static __init enum ipl_type get_ipl_type(void)
249{
250 if (!ipl_block_valid)
251 return IPL_TYPE_UNKNOWN;
252
253 switch (ipl_block.pb0_hdr.pbt) {
254 case IPL_PBT_CCW:
255 return IPL_TYPE_CCW;
256 case IPL_PBT_FCP:
257 if (ipl_block.fcp.opt == IPL_PB0_FCP_OPT_DUMP)
258 return IPL_TYPE_FCP_DUMP;
259 else
260 return IPL_TYPE_FCP;
261 }
262 return IPL_TYPE_UNKNOWN;
263}
264
265struct ipl_info ipl_info;
266EXPORT_SYMBOL_GPL(ipl_info);
267
268static ssize_t ipl_type_show(struct kobject *kobj, struct kobj_attribute *attr,
269 char *page)
270{
271 return sprintf(page, "%s\n", ipl_type_str(ipl_info.type));
272}
273
274static struct kobj_attribute sys_ipl_type_attr = __ATTR_RO(ipl_type);
275
276static ssize_t ipl_secure_show(struct kobject *kobj,
277 struct kobj_attribute *attr, char *page)
278{
279 return sprintf(page, "%i\n", !!ipl_secure_flag);
280}
281
282static struct kobj_attribute sys_ipl_secure_attr =
283 __ATTR(secure, 0444, ipl_secure_show, NULL);
284
285static ssize_t ipl_has_secure_show(struct kobject *kobj,
286 struct kobj_attribute *attr, char *page)
287{
288 return sprintf(page, "%i\n", !!sclp.has_sipl);
289}
290
291static struct kobj_attribute sys_ipl_has_secure_attr =
292 __ATTR(has_secure, 0444, ipl_has_secure_show, NULL);
293
294static ssize_t ipl_vm_parm_show(struct kobject *kobj,
295 struct kobj_attribute *attr, char *page)
296{
297 char parm[DIAG308_VMPARM_SIZE + 1] = {};
298
299 if (ipl_block_valid && (ipl_block.pb0_hdr.pbt == IPL_PBT_CCW))
300 ipl_block_get_ascii_vmparm(parm, sizeof(parm), &ipl_block);
301 return sprintf(page, "%s\n", parm);
302}
303
304static struct kobj_attribute sys_ipl_vm_parm_attr =
305 __ATTR(parm, S_IRUGO, ipl_vm_parm_show, NULL);
306
307static ssize_t sys_ipl_device_show(struct kobject *kobj,
308 struct kobj_attribute *attr, char *page)
309{
310 switch (ipl_info.type) {
311 case IPL_TYPE_CCW:
312 return sprintf(page, "0.%x.%04x\n", ipl_block.ccw.ssid,
313 ipl_block.ccw.devno);
314 case IPL_TYPE_FCP:
315 case IPL_TYPE_FCP_DUMP:
316 return sprintf(page, "0.0.%04x\n", ipl_block.fcp.devno);
317 default:
318 return 0;
319 }
320}
321
322static struct kobj_attribute sys_ipl_device_attr =
323 __ATTR(device, S_IRUGO, sys_ipl_device_show, NULL);
324
325static ssize_t ipl_parameter_read(struct file *filp, struct kobject *kobj,
326 struct bin_attribute *attr, char *buf,
327 loff_t off, size_t count)
328{
329 return memory_read_from_buffer(buf, count, &off, &ipl_block,
330 ipl_block.hdr.len);
331}
332static struct bin_attribute ipl_parameter_attr =
333 __BIN_ATTR(binary_parameter, S_IRUGO, ipl_parameter_read, NULL,
334 PAGE_SIZE);
335
336static ssize_t ipl_scp_data_read(struct file *filp, struct kobject *kobj,
337 struct bin_attribute *attr, char *buf,
338 loff_t off, size_t count)
339{
340 unsigned int size = ipl_block.fcp.scp_data_len;
341 void *scp_data = &ipl_block.fcp.scp_data;
342
343 return memory_read_from_buffer(buf, count, &off, scp_data, size);
344}
345static struct bin_attribute ipl_scp_data_attr =
346 __BIN_ATTR(scp_data, S_IRUGO, ipl_scp_data_read, NULL, PAGE_SIZE);
347
348static struct bin_attribute *ipl_fcp_bin_attrs[] = {
349 &ipl_parameter_attr,
350 &ipl_scp_data_attr,
351 NULL,
352};
353
354/* FCP ipl device attributes */
355
356DEFINE_IPL_ATTR_RO(ipl_fcp, wwpn, "0x%016llx\n",
357 (unsigned long long)ipl_block.fcp.wwpn);
358DEFINE_IPL_ATTR_RO(ipl_fcp, lun, "0x%016llx\n",
359 (unsigned long long)ipl_block.fcp.lun);
360DEFINE_IPL_ATTR_RO(ipl_fcp, bootprog, "%lld\n",
361 (unsigned long long)ipl_block.fcp.bootprog);
362DEFINE_IPL_ATTR_RO(ipl_fcp, br_lba, "%lld\n",
363 (unsigned long long)ipl_block.fcp.br_lba);
364
365static ssize_t ipl_ccw_loadparm_show(struct kobject *kobj,
366 struct kobj_attribute *attr, char *page)
367{
368 char loadparm[LOADPARM_LEN + 1] = {};
369
370 if (!sclp_ipl_info.is_valid)
371 return sprintf(page, "#unknown#\n");
372 memcpy(loadparm, &sclp_ipl_info.loadparm, LOADPARM_LEN);
373 EBCASC(loadparm, LOADPARM_LEN);
374 strim(loadparm);
375 return sprintf(page, "%s\n", loadparm);
376}
377
378static struct kobj_attribute sys_ipl_ccw_loadparm_attr =
379 __ATTR(loadparm, 0444, ipl_ccw_loadparm_show, NULL);
380
381static struct attribute *ipl_fcp_attrs[] = {
382 &sys_ipl_type_attr.attr,
383 &sys_ipl_device_attr.attr,
384 &sys_ipl_fcp_wwpn_attr.attr,
385 &sys_ipl_fcp_lun_attr.attr,
386 &sys_ipl_fcp_bootprog_attr.attr,
387 &sys_ipl_fcp_br_lba_attr.attr,
388 &sys_ipl_ccw_loadparm_attr.attr,
389 &sys_ipl_secure_attr.attr,
390 &sys_ipl_has_secure_attr.attr,
391 NULL,
392};
393
394static struct attribute_group ipl_fcp_attr_group = {
395 .attrs = ipl_fcp_attrs,
396 .bin_attrs = ipl_fcp_bin_attrs,
397};
398
399/* CCW ipl device attributes */
400
401static struct attribute *ipl_ccw_attrs_vm[] = {
402 &sys_ipl_type_attr.attr,
403 &sys_ipl_device_attr.attr,
404 &sys_ipl_ccw_loadparm_attr.attr,
405 &sys_ipl_vm_parm_attr.attr,
406 &sys_ipl_secure_attr.attr,
407 &sys_ipl_has_secure_attr.attr,
408 NULL,
409};
410
411static struct attribute *ipl_ccw_attrs_lpar[] = {
412 &sys_ipl_type_attr.attr,
413 &sys_ipl_device_attr.attr,
414 &sys_ipl_ccw_loadparm_attr.attr,
415 &sys_ipl_secure_attr.attr,
416 &sys_ipl_has_secure_attr.attr,
417 NULL,
418};
419
420static struct attribute_group ipl_ccw_attr_group_vm = {
421 .attrs = ipl_ccw_attrs_vm,
422};
423
424static struct attribute_group ipl_ccw_attr_group_lpar = {
425 .attrs = ipl_ccw_attrs_lpar
426};
427
428/* UNKNOWN ipl device attributes */
429
430static struct attribute *ipl_unknown_attrs[] = {
431 &sys_ipl_type_attr.attr,
432 NULL,
433};
434
435static struct attribute_group ipl_unknown_attr_group = {
436 .attrs = ipl_unknown_attrs,
437};
438
439static struct kset *ipl_kset;
440
441static void __ipl_run(void *unused)
442{
443 __bpon();
444 diag308(DIAG308_LOAD_CLEAR, NULL);
445}
446
447static void ipl_run(struct shutdown_trigger *trigger)
448{
449 smp_call_ipl_cpu(__ipl_run, NULL);
450}
451
452static int __init ipl_init(void)
453{
454 int rc;
455
456 ipl_kset = kset_create_and_add("ipl", NULL, firmware_kobj);
457 if (!ipl_kset) {
458 rc = -ENOMEM;
459 goto out;
460 }
461 switch (ipl_info.type) {
462 case IPL_TYPE_CCW:
463 if (MACHINE_IS_VM)
464 rc = sysfs_create_group(&ipl_kset->kobj,
465 &ipl_ccw_attr_group_vm);
466 else
467 rc = sysfs_create_group(&ipl_kset->kobj,
468 &ipl_ccw_attr_group_lpar);
469 break;
470 case IPL_TYPE_FCP:
471 case IPL_TYPE_FCP_DUMP:
472 rc = sysfs_create_group(&ipl_kset->kobj, &ipl_fcp_attr_group);
473 break;
474 default:
475 rc = sysfs_create_group(&ipl_kset->kobj,
476 &ipl_unknown_attr_group);
477 break;
478 }
479out:
480 if (rc)
481 panic("ipl_init failed: rc = %i\n", rc);
482
483 return 0;
484}
485
486static struct shutdown_action __refdata ipl_action = {
487 .name = SHUTDOWN_ACTION_IPL_STR,
488 .fn = ipl_run,
489 .init = ipl_init,
490};
491
492/*
493 * reipl shutdown action: Reboot Linux on shutdown.
494 */
495
496/* VM IPL PARM attributes */
497static ssize_t reipl_generic_vmparm_show(struct ipl_parameter_block *ipb,
498 char *page)
499{
500 char vmparm[DIAG308_VMPARM_SIZE + 1] = {};
501
502 ipl_block_get_ascii_vmparm(vmparm, sizeof(vmparm), ipb);
503 return sprintf(page, "%s\n", vmparm);
504}
505
506static ssize_t reipl_generic_vmparm_store(struct ipl_parameter_block *ipb,
507 size_t vmparm_max,
508 const char *buf, size_t len)
509{
510 int i, ip_len;
511
512 /* ignore trailing newline */
513 ip_len = len;
514 if ((len > 0) && (buf[len - 1] == '\n'))
515 ip_len--;
516
517 if (ip_len > vmparm_max)
518 return -EINVAL;
519
520 /* parm is used to store kernel options, check for common chars */
521 for (i = 0; i < ip_len; i++)
522 if (!(isalnum(buf[i]) || isascii(buf[i]) || isprint(buf[i])))
523 return -EINVAL;
524
525 memset(ipb->ccw.vm_parm, 0, DIAG308_VMPARM_SIZE);
526 ipb->ccw.vm_parm_len = ip_len;
527 if (ip_len > 0) {
528 ipb->ccw.vm_flags |= IPL_PB0_CCW_VM_FLAG_VP;
529 memcpy(ipb->ccw.vm_parm, buf, ip_len);
530 ASCEBC(ipb->ccw.vm_parm, ip_len);
531 } else {
532 ipb->ccw.vm_flags &= ~IPL_PB0_CCW_VM_FLAG_VP;
533 }
534
535 return len;
536}
537
538/* NSS wrapper */
539static ssize_t reipl_nss_vmparm_show(struct kobject *kobj,
540 struct kobj_attribute *attr, char *page)
541{
542 return reipl_generic_vmparm_show(reipl_block_nss, page);
543}
544
545static ssize_t reipl_nss_vmparm_store(struct kobject *kobj,
546 struct kobj_attribute *attr,
547 const char *buf, size_t len)
548{
549 return reipl_generic_vmparm_store(reipl_block_nss, 56, buf, len);
550}
551
552/* CCW wrapper */
553static ssize_t reipl_ccw_vmparm_show(struct kobject *kobj,
554 struct kobj_attribute *attr, char *page)
555{
556 return reipl_generic_vmparm_show(reipl_block_ccw, page);
557}
558
559static ssize_t reipl_ccw_vmparm_store(struct kobject *kobj,
560 struct kobj_attribute *attr,
561 const char *buf, size_t len)
562{
563 return reipl_generic_vmparm_store(reipl_block_ccw, 64, buf, len);
564}
565
566static struct kobj_attribute sys_reipl_nss_vmparm_attr =
567 __ATTR(parm, S_IRUGO | S_IWUSR, reipl_nss_vmparm_show,
568 reipl_nss_vmparm_store);
569static struct kobj_attribute sys_reipl_ccw_vmparm_attr =
570 __ATTR(parm, S_IRUGO | S_IWUSR, reipl_ccw_vmparm_show,
571 reipl_ccw_vmparm_store);
572
573/* FCP reipl device attributes */
574
575static ssize_t reipl_fcp_scpdata_read(struct file *filp, struct kobject *kobj,
576 struct bin_attribute *attr,
577 char *buf, loff_t off, size_t count)
578{
579 size_t size = reipl_block_fcp->fcp.scp_data_len;
580 void *scp_data = reipl_block_fcp->fcp.scp_data;
581
582 return memory_read_from_buffer(buf, count, &off, scp_data, size);
583}
584
585static ssize_t reipl_fcp_scpdata_write(struct file *filp, struct kobject *kobj,
586 struct bin_attribute *attr,
587 char *buf, loff_t off, size_t count)
588{
589 size_t scpdata_len = count;
590 size_t padding;
591
592
593 if (off)
594 return -EINVAL;
595
596 memcpy(reipl_block_fcp->fcp.scp_data, buf, count);
597 if (scpdata_len % 8) {
598 padding = 8 - (scpdata_len % 8);
599 memset(reipl_block_fcp->fcp.scp_data + scpdata_len,
600 0, padding);
601 scpdata_len += padding;
602 }
603
604 reipl_block_fcp->hdr.len = IPL_BP_FCP_LEN + scpdata_len;
605 reipl_block_fcp->fcp.len = IPL_BP0_FCP_LEN + scpdata_len;
606 reipl_block_fcp->fcp.scp_data_len = scpdata_len;
607
608 return count;
609}
610static struct bin_attribute sys_reipl_fcp_scp_data_attr =
611 __BIN_ATTR(scp_data, (S_IRUGO | S_IWUSR), reipl_fcp_scpdata_read,
612 reipl_fcp_scpdata_write, DIAG308_SCPDATA_SIZE);
613
614static struct bin_attribute *reipl_fcp_bin_attrs[] = {
615 &sys_reipl_fcp_scp_data_attr,
616 NULL,
617};
618
619DEFINE_IPL_ATTR_RW(reipl_fcp, wwpn, "0x%016llx\n", "%llx\n",
620 reipl_block_fcp->fcp.wwpn);
621DEFINE_IPL_ATTR_RW(reipl_fcp, lun, "0x%016llx\n", "%llx\n",
622 reipl_block_fcp->fcp.lun);
623DEFINE_IPL_ATTR_RW(reipl_fcp, bootprog, "%lld\n", "%lld\n",
624 reipl_block_fcp->fcp.bootprog);
625DEFINE_IPL_ATTR_RW(reipl_fcp, br_lba, "%lld\n", "%lld\n",
626 reipl_block_fcp->fcp.br_lba);
627DEFINE_IPL_ATTR_RW(reipl_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
628 reipl_block_fcp->fcp.devno);
629
630static void reipl_get_ascii_loadparm(char *loadparm,
631 struct ipl_parameter_block *ibp)
632{
633 memcpy(loadparm, ibp->common.loadparm, LOADPARM_LEN);
634 EBCASC(loadparm, LOADPARM_LEN);
635 loadparm[LOADPARM_LEN] = 0;
636 strim(loadparm);
637}
638
639static ssize_t reipl_generic_loadparm_show(struct ipl_parameter_block *ipb,
640 char *page)
641{
642 char buf[LOADPARM_LEN + 1];
643
644 reipl_get_ascii_loadparm(buf, ipb);
645 return sprintf(page, "%s\n", buf);
646}
647
648static ssize_t reipl_generic_loadparm_store(struct ipl_parameter_block *ipb,
649 const char *buf, size_t len)
650{
651 int i, lp_len;
652
653 /* ignore trailing newline */
654 lp_len = len;
655 if ((len > 0) && (buf[len - 1] == '\n'))
656 lp_len--;
657 /* loadparm can have max 8 characters and must not start with a blank */
658 if ((lp_len > LOADPARM_LEN) || ((lp_len > 0) && (buf[0] == ' ')))
659 return -EINVAL;
660 /* loadparm can only contain "a-z,A-Z,0-9,SP,." */
661 for (i = 0; i < lp_len; i++) {
662 if (isalpha(buf[i]) || isdigit(buf[i]) || (buf[i] == ' ') ||
663 (buf[i] == '.'))
664 continue;
665 return -EINVAL;
666 }
667 /* initialize loadparm with blanks */
668 memset(ipb->common.loadparm, ' ', LOADPARM_LEN);
669 /* copy and convert to ebcdic */
670 memcpy(ipb->common.loadparm, buf, lp_len);
671 ASCEBC(ipb->common.loadparm, LOADPARM_LEN);
672 ipb->common.flags |= IPL_PB0_FLAG_LOADPARM;
673 return len;
674}
675
676/* FCP wrapper */
677static ssize_t reipl_fcp_loadparm_show(struct kobject *kobj,
678 struct kobj_attribute *attr, char *page)
679{
680 return reipl_generic_loadparm_show(reipl_block_fcp, page);
681}
682
683static ssize_t reipl_fcp_loadparm_store(struct kobject *kobj,
684 struct kobj_attribute *attr,
685 const char *buf, size_t len)
686{
687 return reipl_generic_loadparm_store(reipl_block_fcp, buf, len);
688}
689
690static struct kobj_attribute sys_reipl_fcp_loadparm_attr =
691 __ATTR(loadparm, S_IRUGO | S_IWUSR, reipl_fcp_loadparm_show,
692 reipl_fcp_loadparm_store);
693
694static struct attribute *reipl_fcp_attrs[] = {
695 &sys_reipl_fcp_device_attr.attr,
696 &sys_reipl_fcp_wwpn_attr.attr,
697 &sys_reipl_fcp_lun_attr.attr,
698 &sys_reipl_fcp_bootprog_attr.attr,
699 &sys_reipl_fcp_br_lba_attr.attr,
700 &sys_reipl_fcp_loadparm_attr.attr,
701 NULL,
702};
703
704static struct attribute_group reipl_fcp_attr_group = {
705 .attrs = reipl_fcp_attrs,
706 .bin_attrs = reipl_fcp_bin_attrs,
707};
708
709/* CCW reipl device attributes */
710DEFINE_IPL_CCW_ATTR_RW(reipl_ccw, device, reipl_block_ccw->ccw);
711
712/* NSS wrapper */
713static ssize_t reipl_nss_loadparm_show(struct kobject *kobj,
714 struct kobj_attribute *attr, char *page)
715{
716 return reipl_generic_loadparm_show(reipl_block_nss, page);
717}
718
719static ssize_t reipl_nss_loadparm_store(struct kobject *kobj,
720 struct kobj_attribute *attr,
721 const char *buf, size_t len)
722{
723 return reipl_generic_loadparm_store(reipl_block_nss, buf, len);
724}
725
726/* CCW wrapper */
727static ssize_t reipl_ccw_loadparm_show(struct kobject *kobj,
728 struct kobj_attribute *attr, char *page)
729{
730 return reipl_generic_loadparm_show(reipl_block_ccw, page);
731}
732
733static ssize_t reipl_ccw_loadparm_store(struct kobject *kobj,
734 struct kobj_attribute *attr,
735 const char *buf, size_t len)
736{
737 return reipl_generic_loadparm_store(reipl_block_ccw, buf, len);
738}
739
740static struct kobj_attribute sys_reipl_ccw_loadparm_attr =
741 __ATTR(loadparm, S_IRUGO | S_IWUSR, reipl_ccw_loadparm_show,
742 reipl_ccw_loadparm_store);
743
744static struct attribute *reipl_ccw_attrs_vm[] = {
745 &sys_reipl_ccw_device_attr.attr,
746 &sys_reipl_ccw_loadparm_attr.attr,
747 &sys_reipl_ccw_vmparm_attr.attr,
748 NULL,
749};
750
751static struct attribute *reipl_ccw_attrs_lpar[] = {
752 &sys_reipl_ccw_device_attr.attr,
753 &sys_reipl_ccw_loadparm_attr.attr,
754 NULL,
755};
756
757static struct attribute_group reipl_ccw_attr_group_vm = {
758 .name = IPL_CCW_STR,
759 .attrs = reipl_ccw_attrs_vm,
760};
761
762static struct attribute_group reipl_ccw_attr_group_lpar = {
763 .name = IPL_CCW_STR,
764 .attrs = reipl_ccw_attrs_lpar,
765};
766
767
768/* NSS reipl device attributes */
769static void reipl_get_ascii_nss_name(char *dst,
770 struct ipl_parameter_block *ipb)
771{
772 memcpy(dst, ipb->ccw.nss_name, NSS_NAME_SIZE);
773 EBCASC(dst, NSS_NAME_SIZE);
774 dst[NSS_NAME_SIZE] = 0;
775}
776
777static ssize_t reipl_nss_name_show(struct kobject *kobj,
778 struct kobj_attribute *attr, char *page)
779{
780 char nss_name[NSS_NAME_SIZE + 1] = {};
781
782 reipl_get_ascii_nss_name(nss_name, reipl_block_nss);
783 return sprintf(page, "%s\n", nss_name);
784}
785
786static ssize_t reipl_nss_name_store(struct kobject *kobj,
787 struct kobj_attribute *attr,
788 const char *buf, size_t len)
789{
790 int nss_len;
791
792 /* ignore trailing newline */
793 nss_len = len;
794 if ((len > 0) && (buf[len - 1] == '\n'))
795 nss_len--;
796
797 if (nss_len > NSS_NAME_SIZE)
798 return -EINVAL;
799
800 memset(reipl_block_nss->ccw.nss_name, 0x40, NSS_NAME_SIZE);
801 if (nss_len > 0) {
802 reipl_block_nss->ccw.vm_flags |= IPL_PB0_CCW_VM_FLAG_NSS;
803 memcpy(reipl_block_nss->ccw.nss_name, buf, nss_len);
804 ASCEBC(reipl_block_nss->ccw.nss_name, nss_len);
805 EBC_TOUPPER(reipl_block_nss->ccw.nss_name, nss_len);
806 } else {
807 reipl_block_nss->ccw.vm_flags &= ~IPL_PB0_CCW_VM_FLAG_NSS;
808 }
809
810 return len;
811}
812
813static struct kobj_attribute sys_reipl_nss_name_attr =
814 __ATTR(name, S_IRUGO | S_IWUSR, reipl_nss_name_show,
815 reipl_nss_name_store);
816
817static struct kobj_attribute sys_reipl_nss_loadparm_attr =
818 __ATTR(loadparm, S_IRUGO | S_IWUSR, reipl_nss_loadparm_show,
819 reipl_nss_loadparm_store);
820
821static struct attribute *reipl_nss_attrs[] = {
822 &sys_reipl_nss_name_attr.attr,
823 &sys_reipl_nss_loadparm_attr.attr,
824 &sys_reipl_nss_vmparm_attr.attr,
825 NULL,
826};
827
828static struct attribute_group reipl_nss_attr_group = {
829 .name = IPL_NSS_STR,
830 .attrs = reipl_nss_attrs,
831};
832
833void set_os_info_reipl_block(void)
834{
835 os_info_entry_add(OS_INFO_REIPL_BLOCK, reipl_block_actual,
836 reipl_block_actual->hdr.len);
837}
838
839/* reipl type */
840
841static int reipl_set_type(enum ipl_type type)
842{
843 if (!(reipl_capabilities & type))
844 return -EINVAL;
845
846 switch(type) {
847 case IPL_TYPE_CCW:
848 reipl_block_actual = reipl_block_ccw;
849 break;
850 case IPL_TYPE_FCP:
851 reipl_block_actual = reipl_block_fcp;
852 break;
853 case IPL_TYPE_NSS:
854 reipl_block_actual = reipl_block_nss;
855 break;
856 default:
857 break;
858 }
859 reipl_type = type;
860 return 0;
861}
862
863static ssize_t reipl_type_show(struct kobject *kobj,
864 struct kobj_attribute *attr, char *page)
865{
866 return sprintf(page, "%s\n", ipl_type_str(reipl_type));
867}
868
869static ssize_t reipl_type_store(struct kobject *kobj,
870 struct kobj_attribute *attr,
871 const char *buf, size_t len)
872{
873 int rc = -EINVAL;
874
875 if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
876 rc = reipl_set_type(IPL_TYPE_CCW);
877 else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
878 rc = reipl_set_type(IPL_TYPE_FCP);
879 else if (strncmp(buf, IPL_NSS_STR, strlen(IPL_NSS_STR)) == 0)
880 rc = reipl_set_type(IPL_TYPE_NSS);
881 return (rc != 0) ? rc : len;
882}
883
884static struct kobj_attribute reipl_type_attr =
885 __ATTR(reipl_type, 0644, reipl_type_show, reipl_type_store);
886
887static struct kset *reipl_kset;
888static struct kset *reipl_fcp_kset;
889
890static void __reipl_run(void *unused)
891{
892 switch (reipl_type) {
893 case IPL_TYPE_CCW:
894 diag308(DIAG308_SET, reipl_block_ccw);
895 diag308(DIAG308_LOAD_CLEAR, NULL);
896 break;
897 case IPL_TYPE_FCP:
898 diag308(DIAG308_SET, reipl_block_fcp);
899 diag308(DIAG308_LOAD_CLEAR, NULL);
900 break;
901 case IPL_TYPE_NSS:
902 diag308(DIAG308_SET, reipl_block_nss);
903 diag308(DIAG308_LOAD_CLEAR, NULL);
904 break;
905 case IPL_TYPE_UNKNOWN:
906 diag308(DIAG308_LOAD_CLEAR, NULL);
907 break;
908 case IPL_TYPE_FCP_DUMP:
909 break;
910 }
911 disabled_wait();
912}
913
914static void reipl_run(struct shutdown_trigger *trigger)
915{
916 smp_call_ipl_cpu(__reipl_run, NULL);
917}
918
919static void reipl_block_ccw_init(struct ipl_parameter_block *ipb)
920{
921 ipb->hdr.len = IPL_BP_CCW_LEN;
922 ipb->hdr.version = IPL_PARM_BLOCK_VERSION;
923 ipb->pb0_hdr.len = IPL_BP0_CCW_LEN;
924 ipb->pb0_hdr.pbt = IPL_PBT_CCW;
925}
926
927static void reipl_block_ccw_fill_parms(struct ipl_parameter_block *ipb)
928{
929 /* LOADPARM */
930 /* check if read scp info worked and set loadparm */
931 if (sclp_ipl_info.is_valid)
932 memcpy(ipb->ccw.loadparm, &sclp_ipl_info.loadparm, LOADPARM_LEN);
933 else
934 /* read scp info failed: set empty loadparm (EBCDIC blanks) */
935 memset(ipb->ccw.loadparm, 0x40, LOADPARM_LEN);
936 ipb->ccw.flags = IPL_PB0_FLAG_LOADPARM;
937
938 /* VM PARM */
939 if (MACHINE_IS_VM && ipl_block_valid &&
940 (ipl_block.ccw.vm_flags & IPL_PB0_CCW_VM_FLAG_VP)) {
941
942 ipb->ccw.vm_flags |= IPL_PB0_CCW_VM_FLAG_VP;
943 ipb->ccw.vm_parm_len = ipl_block.ccw.vm_parm_len;
944 memcpy(ipb->ccw.vm_parm,
945 ipl_block.ccw.vm_parm, DIAG308_VMPARM_SIZE);
946 }
947}
948
949static int __init reipl_nss_init(void)
950{
951 int rc;
952
953 if (!MACHINE_IS_VM)
954 return 0;
955
956 reipl_block_nss = (void *) get_zeroed_page(GFP_KERNEL);
957 if (!reipl_block_nss)
958 return -ENOMEM;
959
960 rc = sysfs_create_group(&reipl_kset->kobj, &reipl_nss_attr_group);
961 if (rc)
962 return rc;
963
964 reipl_block_ccw_init(reipl_block_nss);
965 reipl_capabilities |= IPL_TYPE_NSS;
966 return 0;
967}
968
969static int __init reipl_ccw_init(void)
970{
971 int rc;
972
973 reipl_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
974 if (!reipl_block_ccw)
975 return -ENOMEM;
976
977 rc = sysfs_create_group(&reipl_kset->kobj,
978 MACHINE_IS_VM ? &reipl_ccw_attr_group_vm
979 : &reipl_ccw_attr_group_lpar);
980 if (rc)
981 return rc;
982
983 reipl_block_ccw_init(reipl_block_ccw);
984 if (ipl_info.type == IPL_TYPE_CCW) {
985 reipl_block_ccw->ccw.ssid = ipl_block.ccw.ssid;
986 reipl_block_ccw->ccw.devno = ipl_block.ccw.devno;
987 reipl_block_ccw_fill_parms(reipl_block_ccw);
988 }
989
990 reipl_capabilities |= IPL_TYPE_CCW;
991 return 0;
992}
993
994static int __init reipl_fcp_init(void)
995{
996 int rc;
997
998 reipl_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
999 if (!reipl_block_fcp)
1000 return -ENOMEM;
1001
1002 /* sysfs: create fcp kset for mixing attr group and bin attrs */
1003 reipl_fcp_kset = kset_create_and_add(IPL_FCP_STR, NULL,
1004 &reipl_kset->kobj);
1005 if (!reipl_fcp_kset) {
1006 free_page((unsigned long) reipl_block_fcp);
1007 return -ENOMEM;
1008 }
1009
1010 rc = sysfs_create_group(&reipl_fcp_kset->kobj, &reipl_fcp_attr_group);
1011 if (rc) {
1012 kset_unregister(reipl_fcp_kset);
1013 free_page((unsigned long) reipl_block_fcp);
1014 return rc;
1015 }
1016
1017 if (ipl_info.type == IPL_TYPE_FCP) {
1018 memcpy(reipl_block_fcp, &ipl_block, sizeof(ipl_block));
1019 /*
1020 * Fix loadparm: There are systems where the (SCSI) LOADPARM
1021 * is invalid in the SCSI IPL parameter block, so take it
1022 * always from sclp_ipl_info.
1023 */
1024 memcpy(reipl_block_fcp->fcp.loadparm, sclp_ipl_info.loadparm,
1025 LOADPARM_LEN);
1026 } else {
1027 reipl_block_fcp->hdr.len = IPL_BP_FCP_LEN;
1028 reipl_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
1029 reipl_block_fcp->fcp.len = IPL_BP0_FCP_LEN;
1030 reipl_block_fcp->fcp.pbt = IPL_PBT_FCP;
1031 reipl_block_fcp->fcp.opt = IPL_PB0_FCP_OPT_IPL;
1032 }
1033 reipl_capabilities |= IPL_TYPE_FCP;
1034 return 0;
1035}
1036
1037static int __init reipl_type_init(void)
1038{
1039 enum ipl_type reipl_type = ipl_info.type;
1040 struct ipl_parameter_block *reipl_block;
1041 unsigned long size;
1042
1043 reipl_block = os_info_old_entry(OS_INFO_REIPL_BLOCK, &size);
1044 if (!reipl_block)
1045 goto out;
1046 /*
1047 * If we have an OS info reipl block, this will be used
1048 */
1049 if (reipl_block->pb0_hdr.pbt == IPL_PBT_FCP) {
1050 memcpy(reipl_block_fcp, reipl_block, size);
1051 reipl_type = IPL_TYPE_FCP;
1052 } else if (reipl_block->pb0_hdr.pbt == IPL_PBT_CCW) {
1053 memcpy(reipl_block_ccw, reipl_block, size);
1054 reipl_type = IPL_TYPE_CCW;
1055 }
1056out:
1057 return reipl_set_type(reipl_type);
1058}
1059
1060static int __init reipl_init(void)
1061{
1062 int rc;
1063
1064 reipl_kset = kset_create_and_add("reipl", NULL, firmware_kobj);
1065 if (!reipl_kset)
1066 return -ENOMEM;
1067 rc = sysfs_create_file(&reipl_kset->kobj, &reipl_type_attr.attr);
1068 if (rc) {
1069 kset_unregister(reipl_kset);
1070 return rc;
1071 }
1072 rc = reipl_ccw_init();
1073 if (rc)
1074 return rc;
1075 rc = reipl_fcp_init();
1076 if (rc)
1077 return rc;
1078 rc = reipl_nss_init();
1079 if (rc)
1080 return rc;
1081 return reipl_type_init();
1082}
1083
1084static struct shutdown_action __refdata reipl_action = {
1085 .name = SHUTDOWN_ACTION_REIPL_STR,
1086 .fn = reipl_run,
1087 .init = reipl_init,
1088};
1089
1090/*
1091 * dump shutdown action: Dump Linux on shutdown.
1092 */
1093
1094/* FCP dump device attributes */
1095
1096DEFINE_IPL_ATTR_RW(dump_fcp, wwpn, "0x%016llx\n", "%llx\n",
1097 dump_block_fcp->fcp.wwpn);
1098DEFINE_IPL_ATTR_RW(dump_fcp, lun, "0x%016llx\n", "%llx\n",
1099 dump_block_fcp->fcp.lun);
1100DEFINE_IPL_ATTR_RW(dump_fcp, bootprog, "%lld\n", "%lld\n",
1101 dump_block_fcp->fcp.bootprog);
1102DEFINE_IPL_ATTR_RW(dump_fcp, br_lba, "%lld\n", "%lld\n",
1103 dump_block_fcp->fcp.br_lba);
1104DEFINE_IPL_ATTR_RW(dump_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
1105 dump_block_fcp->fcp.devno);
1106
1107static struct attribute *dump_fcp_attrs[] = {
1108 &sys_dump_fcp_device_attr.attr,
1109 &sys_dump_fcp_wwpn_attr.attr,
1110 &sys_dump_fcp_lun_attr.attr,
1111 &sys_dump_fcp_bootprog_attr.attr,
1112 &sys_dump_fcp_br_lba_attr.attr,
1113 NULL,
1114};
1115
1116static struct attribute_group dump_fcp_attr_group = {
1117 .name = IPL_FCP_STR,
1118 .attrs = dump_fcp_attrs,
1119};
1120
1121/* CCW dump device attributes */
1122DEFINE_IPL_CCW_ATTR_RW(dump_ccw, device, dump_block_ccw->ccw);
1123
1124static struct attribute *dump_ccw_attrs[] = {
1125 &sys_dump_ccw_device_attr.attr,
1126 NULL,
1127};
1128
1129static struct attribute_group dump_ccw_attr_group = {
1130 .name = IPL_CCW_STR,
1131 .attrs = dump_ccw_attrs,
1132};
1133
1134/* dump type */
1135
1136static int dump_set_type(enum dump_type type)
1137{
1138 if (!(dump_capabilities & type))
1139 return -EINVAL;
1140 dump_type = type;
1141 return 0;
1142}
1143
1144static ssize_t dump_type_show(struct kobject *kobj,
1145 struct kobj_attribute *attr, char *page)
1146{
1147 return sprintf(page, "%s\n", dump_type_str(dump_type));
1148}
1149
1150static ssize_t dump_type_store(struct kobject *kobj,
1151 struct kobj_attribute *attr,
1152 const char *buf, size_t len)
1153{
1154 int rc = -EINVAL;
1155
1156 if (strncmp(buf, DUMP_NONE_STR, strlen(DUMP_NONE_STR)) == 0)
1157 rc = dump_set_type(DUMP_TYPE_NONE);
1158 else if (strncmp(buf, DUMP_CCW_STR, strlen(DUMP_CCW_STR)) == 0)
1159 rc = dump_set_type(DUMP_TYPE_CCW);
1160 else if (strncmp(buf, DUMP_FCP_STR, strlen(DUMP_FCP_STR)) == 0)
1161 rc = dump_set_type(DUMP_TYPE_FCP);
1162 return (rc != 0) ? rc : len;
1163}
1164
1165static struct kobj_attribute dump_type_attr =
1166 __ATTR(dump_type, 0644, dump_type_show, dump_type_store);
1167
1168static struct kset *dump_kset;
1169
1170static void diag308_dump(void *dump_block)
1171{
1172 diag308(DIAG308_SET, dump_block);
1173 while (1) {
1174 if (diag308(DIAG308_LOAD_NORMAL_DUMP, NULL) != 0x302)
1175 break;
1176 udelay_simple(USEC_PER_SEC);
1177 }
1178}
1179
1180static void __dump_run(void *unused)
1181{
1182 switch (dump_type) {
1183 case DUMP_TYPE_CCW:
1184 diag308_dump(dump_block_ccw);
1185 break;
1186 case DUMP_TYPE_FCP:
1187 diag308_dump(dump_block_fcp);
1188 break;
1189 default:
1190 break;
1191 }
1192}
1193
1194static void dump_run(struct shutdown_trigger *trigger)
1195{
1196 if (dump_type == DUMP_TYPE_NONE)
1197 return;
1198 smp_send_stop();
1199 smp_call_ipl_cpu(__dump_run, NULL);
1200}
1201
1202static int __init dump_ccw_init(void)
1203{
1204 int rc;
1205
1206 dump_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
1207 if (!dump_block_ccw)
1208 return -ENOMEM;
1209 rc = sysfs_create_group(&dump_kset->kobj, &dump_ccw_attr_group);
1210 if (rc) {
1211 free_page((unsigned long)dump_block_ccw);
1212 return rc;
1213 }
1214 dump_block_ccw->hdr.len = IPL_BP_CCW_LEN;
1215 dump_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
1216 dump_block_ccw->ccw.len = IPL_BP0_CCW_LEN;
1217 dump_block_ccw->ccw.pbt = IPL_PBT_CCW;
1218 dump_capabilities |= DUMP_TYPE_CCW;
1219 return 0;
1220}
1221
1222static int __init dump_fcp_init(void)
1223{
1224 int rc;
1225
1226 if (!sclp_ipl_info.has_dump)
1227 return 0; /* LDIPL DUMP is not installed */
1228 dump_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
1229 if (!dump_block_fcp)
1230 return -ENOMEM;
1231 rc = sysfs_create_group(&dump_kset->kobj, &dump_fcp_attr_group);
1232 if (rc) {
1233 free_page((unsigned long)dump_block_fcp);
1234 return rc;
1235 }
1236 dump_block_fcp->hdr.len = IPL_BP_FCP_LEN;
1237 dump_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
1238 dump_block_fcp->fcp.len = IPL_BP0_FCP_LEN;
1239 dump_block_fcp->fcp.pbt = IPL_PBT_FCP;
1240 dump_block_fcp->fcp.opt = IPL_PB0_FCP_OPT_DUMP;
1241 dump_capabilities |= DUMP_TYPE_FCP;
1242 return 0;
1243}
1244
1245static int __init dump_init(void)
1246{
1247 int rc;
1248
1249 dump_kset = kset_create_and_add("dump", NULL, firmware_kobj);
1250 if (!dump_kset)
1251 return -ENOMEM;
1252 rc = sysfs_create_file(&dump_kset->kobj, &dump_type_attr.attr);
1253 if (rc) {
1254 kset_unregister(dump_kset);
1255 return rc;
1256 }
1257 rc = dump_ccw_init();
1258 if (rc)
1259 return rc;
1260 rc = dump_fcp_init();
1261 if (rc)
1262 return rc;
1263 dump_set_type(DUMP_TYPE_NONE);
1264 return 0;
1265}
1266
1267static struct shutdown_action __refdata dump_action = {
1268 .name = SHUTDOWN_ACTION_DUMP_STR,
1269 .fn = dump_run,
1270 .init = dump_init,
1271};
1272
1273static void dump_reipl_run(struct shutdown_trigger *trigger)
1274{
1275 unsigned long ipib = (unsigned long) reipl_block_actual;
1276 unsigned int csum;
1277
1278 csum = (__force unsigned int)
1279 csum_partial(reipl_block_actual, reipl_block_actual->hdr.len, 0);
1280 mem_assign_absolute(S390_lowcore.ipib, ipib);
1281 mem_assign_absolute(S390_lowcore.ipib_checksum, csum);
1282 dump_run(trigger);
1283}
1284
1285static struct shutdown_action __refdata dump_reipl_action = {
1286 .name = SHUTDOWN_ACTION_DUMP_REIPL_STR,
1287 .fn = dump_reipl_run,
1288};
1289
1290/*
1291 * vmcmd shutdown action: Trigger vm command on shutdown.
1292 */
1293
1294static char vmcmd_on_reboot[128];
1295static char vmcmd_on_panic[128];
1296static char vmcmd_on_halt[128];
1297static char vmcmd_on_poff[128];
1298static char vmcmd_on_restart[128];
1299
1300DEFINE_IPL_ATTR_STR_RW(vmcmd, on_reboot, "%s\n", "%s\n", vmcmd_on_reboot);
1301DEFINE_IPL_ATTR_STR_RW(vmcmd, on_panic, "%s\n", "%s\n", vmcmd_on_panic);
1302DEFINE_IPL_ATTR_STR_RW(vmcmd, on_halt, "%s\n", "%s\n", vmcmd_on_halt);
1303DEFINE_IPL_ATTR_STR_RW(vmcmd, on_poff, "%s\n", "%s\n", vmcmd_on_poff);
1304DEFINE_IPL_ATTR_STR_RW(vmcmd, on_restart, "%s\n", "%s\n", vmcmd_on_restart);
1305
1306static struct attribute *vmcmd_attrs[] = {
1307 &sys_vmcmd_on_reboot_attr.attr,
1308 &sys_vmcmd_on_panic_attr.attr,
1309 &sys_vmcmd_on_halt_attr.attr,
1310 &sys_vmcmd_on_poff_attr.attr,
1311 &sys_vmcmd_on_restart_attr.attr,
1312 NULL,
1313};
1314
1315static struct attribute_group vmcmd_attr_group = {
1316 .attrs = vmcmd_attrs,
1317};
1318
1319static struct kset *vmcmd_kset;
1320
1321static void vmcmd_run(struct shutdown_trigger *trigger)
1322{
1323 char *cmd;
1324
1325 if (strcmp(trigger->name, ON_REIPL_STR) == 0)
1326 cmd = vmcmd_on_reboot;
1327 else if (strcmp(trigger->name, ON_PANIC_STR) == 0)
1328 cmd = vmcmd_on_panic;
1329 else if (strcmp(trigger->name, ON_HALT_STR) == 0)
1330 cmd = vmcmd_on_halt;
1331 else if (strcmp(trigger->name, ON_POFF_STR) == 0)
1332 cmd = vmcmd_on_poff;
1333 else if (strcmp(trigger->name, ON_RESTART_STR) == 0)
1334 cmd = vmcmd_on_restart;
1335 else
1336 return;
1337
1338 if (strlen(cmd) == 0)
1339 return;
1340 __cpcmd(cmd, NULL, 0, NULL);
1341}
1342
1343static int vmcmd_init(void)
1344{
1345 if (!MACHINE_IS_VM)
1346 return -EOPNOTSUPP;
1347 vmcmd_kset = kset_create_and_add("vmcmd", NULL, firmware_kobj);
1348 if (!vmcmd_kset)
1349 return -ENOMEM;
1350 return sysfs_create_group(&vmcmd_kset->kobj, &vmcmd_attr_group);
1351}
1352
1353static struct shutdown_action vmcmd_action = {SHUTDOWN_ACTION_VMCMD_STR,
1354 vmcmd_run, vmcmd_init};
1355
1356/*
1357 * stop shutdown action: Stop Linux on shutdown.
1358 */
1359
1360static void stop_run(struct shutdown_trigger *trigger)
1361{
1362 if (strcmp(trigger->name, ON_PANIC_STR) == 0 ||
1363 strcmp(trigger->name, ON_RESTART_STR) == 0)
1364 disabled_wait();
1365 smp_stop_cpu();
1366}
1367
1368static struct shutdown_action stop_action = {SHUTDOWN_ACTION_STOP_STR,
1369 stop_run, NULL};
1370
1371/* action list */
1372
1373static struct shutdown_action *shutdown_actions_list[] = {
1374 &ipl_action, &reipl_action, &dump_reipl_action, &dump_action,
1375 &vmcmd_action, &stop_action};
1376#define SHUTDOWN_ACTIONS_COUNT (sizeof(shutdown_actions_list) / sizeof(void *))
1377
1378/*
1379 * Trigger section
1380 */
1381
1382static struct kset *shutdown_actions_kset;
1383
1384static int set_trigger(const char *buf, struct shutdown_trigger *trigger,
1385 size_t len)
1386{
1387 int i;
1388
1389 for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
1390 if (sysfs_streq(buf, shutdown_actions_list[i]->name)) {
1391 if (shutdown_actions_list[i]->init_rc) {
1392 return shutdown_actions_list[i]->init_rc;
1393 } else {
1394 trigger->action = shutdown_actions_list[i];
1395 return len;
1396 }
1397 }
1398 }
1399 return -EINVAL;
1400}
1401
1402/* on reipl */
1403
1404static struct shutdown_trigger on_reboot_trigger = {ON_REIPL_STR,
1405 &reipl_action};
1406
1407static ssize_t on_reboot_show(struct kobject *kobj,
1408 struct kobj_attribute *attr, char *page)
1409{
1410 return sprintf(page, "%s\n", on_reboot_trigger.action->name);
1411}
1412
1413static ssize_t on_reboot_store(struct kobject *kobj,
1414 struct kobj_attribute *attr,
1415 const char *buf, size_t len)
1416{
1417 return set_trigger(buf, &on_reboot_trigger, len);
1418}
1419static struct kobj_attribute on_reboot_attr = __ATTR_RW(on_reboot);
1420
1421static void do_machine_restart(char *__unused)
1422{
1423 smp_send_stop();
1424 on_reboot_trigger.action->fn(&on_reboot_trigger);
1425 reipl_run(NULL);
1426}
1427void (*_machine_restart)(char *command) = do_machine_restart;
1428
1429/* on panic */
1430
1431static struct shutdown_trigger on_panic_trigger = {ON_PANIC_STR, &stop_action};
1432
1433static ssize_t on_panic_show(struct kobject *kobj,
1434 struct kobj_attribute *attr, char *page)
1435{
1436 return sprintf(page, "%s\n", on_panic_trigger.action->name);
1437}
1438
1439static ssize_t on_panic_store(struct kobject *kobj,
1440 struct kobj_attribute *attr,
1441 const char *buf, size_t len)
1442{
1443 return set_trigger(buf, &on_panic_trigger, len);
1444}
1445static struct kobj_attribute on_panic_attr = __ATTR_RW(on_panic);
1446
1447static void do_panic(void)
1448{
1449 lgr_info_log();
1450 on_panic_trigger.action->fn(&on_panic_trigger);
1451 stop_run(&on_panic_trigger);
1452}
1453
1454/* on restart */
1455
1456static struct shutdown_trigger on_restart_trigger = {ON_RESTART_STR,
1457 &stop_action};
1458
1459static ssize_t on_restart_show(struct kobject *kobj,
1460 struct kobj_attribute *attr, char *page)
1461{
1462 return sprintf(page, "%s\n", on_restart_trigger.action->name);
1463}
1464
1465static ssize_t on_restart_store(struct kobject *kobj,
1466 struct kobj_attribute *attr,
1467 const char *buf, size_t len)
1468{
1469 return set_trigger(buf, &on_restart_trigger, len);
1470}
1471static struct kobj_attribute on_restart_attr = __ATTR_RW(on_restart);
1472
1473static void __do_restart(void *ignore)
1474{
1475 __arch_local_irq_stosm(0x04); /* enable DAT */
1476 smp_send_stop();
1477#ifdef CONFIG_CRASH_DUMP
1478 crash_kexec(NULL);
1479#endif
1480 on_restart_trigger.action->fn(&on_restart_trigger);
1481 stop_run(&on_restart_trigger);
1482}
1483
1484void do_restart(void)
1485{
1486 tracing_off();
1487 debug_locks_off();
1488 lgr_info_log();
1489 smp_call_online_cpu(__do_restart, NULL);
1490}
1491
1492/* on halt */
1493
1494static struct shutdown_trigger on_halt_trigger = {ON_HALT_STR, &stop_action};
1495
1496static ssize_t on_halt_show(struct kobject *kobj,
1497 struct kobj_attribute *attr, char *page)
1498{
1499 return sprintf(page, "%s\n", on_halt_trigger.action->name);
1500}
1501
1502static ssize_t on_halt_store(struct kobject *kobj,
1503 struct kobj_attribute *attr,
1504 const char *buf, size_t len)
1505{
1506 return set_trigger(buf, &on_halt_trigger, len);
1507}
1508static struct kobj_attribute on_halt_attr = __ATTR_RW(on_halt);
1509
1510static void do_machine_halt(void)
1511{
1512 smp_send_stop();
1513 on_halt_trigger.action->fn(&on_halt_trigger);
1514 stop_run(&on_halt_trigger);
1515}
1516void (*_machine_halt)(void) = do_machine_halt;
1517
1518/* on power off */
1519
1520static struct shutdown_trigger on_poff_trigger = {ON_POFF_STR, &stop_action};
1521
1522static ssize_t on_poff_show(struct kobject *kobj,
1523 struct kobj_attribute *attr, char *page)
1524{
1525 return sprintf(page, "%s\n", on_poff_trigger.action->name);
1526}
1527
1528static ssize_t on_poff_store(struct kobject *kobj,
1529 struct kobj_attribute *attr,
1530 const char *buf, size_t len)
1531{
1532 return set_trigger(buf, &on_poff_trigger, len);
1533}
1534static struct kobj_attribute on_poff_attr = __ATTR_RW(on_poff);
1535
1536static void do_machine_power_off(void)
1537{
1538 smp_send_stop();
1539 on_poff_trigger.action->fn(&on_poff_trigger);
1540 stop_run(&on_poff_trigger);
1541}
1542void (*_machine_power_off)(void) = do_machine_power_off;
1543
1544static struct attribute *shutdown_action_attrs[] = {
1545 &on_restart_attr.attr,
1546 &on_reboot_attr.attr,
1547 &on_panic_attr.attr,
1548 &on_halt_attr.attr,
1549 &on_poff_attr.attr,
1550 NULL,
1551};
1552
1553static struct attribute_group shutdown_action_attr_group = {
1554 .attrs = shutdown_action_attrs,
1555};
1556
1557static void __init shutdown_triggers_init(void)
1558{
1559 shutdown_actions_kset = kset_create_and_add("shutdown_actions", NULL,
1560 firmware_kobj);
1561 if (!shutdown_actions_kset)
1562 goto fail;
1563 if (sysfs_create_group(&shutdown_actions_kset->kobj,
1564 &shutdown_action_attr_group))
1565 goto fail;
1566 return;
1567fail:
1568 panic("shutdown_triggers_init failed\n");
1569}
1570
1571static void __init shutdown_actions_init(void)
1572{
1573 int i;
1574
1575 for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
1576 if (!shutdown_actions_list[i]->init)
1577 continue;
1578 shutdown_actions_list[i]->init_rc =
1579 shutdown_actions_list[i]->init();
1580 }
1581}
1582
1583static int __init s390_ipl_init(void)
1584{
1585 char str[8] = {0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40};
1586
1587 sclp_early_get_ipl_info(&sclp_ipl_info);
1588 /*
1589 * Fix loadparm: There are systems where the (SCSI) LOADPARM
1590 * returned by read SCP info is invalid (contains EBCDIC blanks)
1591 * when the system has been booted via diag308. In that case we use
1592 * the value from diag308, if available.
1593 *
1594 * There are also systems where diag308 store does not work in
1595 * case the system is booted from HMC. Fortunately in this case
1596 * READ SCP info provides the correct value.
1597 */
1598 if (memcmp(sclp_ipl_info.loadparm, str, sizeof(str)) == 0 && ipl_block_valid)
1599 memcpy(sclp_ipl_info.loadparm, ipl_block.ccw.loadparm, LOADPARM_LEN);
1600 shutdown_actions_init();
1601 shutdown_triggers_init();
1602 return 0;
1603}
1604
1605__initcall(s390_ipl_init);
1606
1607static void __init strncpy_skip_quote(char *dst, char *src, int n)
1608{
1609 int sx, dx;
1610
1611 dx = 0;
1612 for (sx = 0; src[sx] != 0; sx++) {
1613 if (src[sx] == '"')
1614 continue;
1615 dst[dx++] = src[sx];
1616 if (dx >= n)
1617 break;
1618 }
1619}
1620
1621static int __init vmcmd_on_reboot_setup(char *str)
1622{
1623 if (!MACHINE_IS_VM)
1624 return 1;
1625 strncpy_skip_quote(vmcmd_on_reboot, str, 127);
1626 vmcmd_on_reboot[127] = 0;
1627 on_reboot_trigger.action = &vmcmd_action;
1628 return 1;
1629}
1630__setup("vmreboot=", vmcmd_on_reboot_setup);
1631
1632static int __init vmcmd_on_panic_setup(char *str)
1633{
1634 if (!MACHINE_IS_VM)
1635 return 1;
1636 strncpy_skip_quote(vmcmd_on_panic, str, 127);
1637 vmcmd_on_panic[127] = 0;
1638 on_panic_trigger.action = &vmcmd_action;
1639 return 1;
1640}
1641__setup("vmpanic=", vmcmd_on_panic_setup);
1642
1643static int __init vmcmd_on_halt_setup(char *str)
1644{
1645 if (!MACHINE_IS_VM)
1646 return 1;
1647 strncpy_skip_quote(vmcmd_on_halt, str, 127);
1648 vmcmd_on_halt[127] = 0;
1649 on_halt_trigger.action = &vmcmd_action;
1650 return 1;
1651}
1652__setup("vmhalt=", vmcmd_on_halt_setup);
1653
1654static int __init vmcmd_on_poff_setup(char *str)
1655{
1656 if (!MACHINE_IS_VM)
1657 return 1;
1658 strncpy_skip_quote(vmcmd_on_poff, str, 127);
1659 vmcmd_on_poff[127] = 0;
1660 on_poff_trigger.action = &vmcmd_action;
1661 return 1;
1662}
1663__setup("vmpoff=", vmcmd_on_poff_setup);
1664
1665static int on_panic_notify(struct notifier_block *self,
1666 unsigned long event, void *data)
1667{
1668 do_panic();
1669 return NOTIFY_OK;
1670}
1671
1672static struct notifier_block on_panic_nb = {
1673 .notifier_call = on_panic_notify,
1674 .priority = INT_MIN,
1675};
1676
1677void __init setup_ipl(void)
1678{
1679 BUILD_BUG_ON(sizeof(struct ipl_parameter_block) != PAGE_SIZE);
1680
1681 ipl_info.type = get_ipl_type();
1682 switch (ipl_info.type) {
1683 case IPL_TYPE_CCW:
1684 ipl_info.data.ccw.dev_id.ssid = ipl_block.ccw.ssid;
1685 ipl_info.data.ccw.dev_id.devno = ipl_block.ccw.devno;
1686 break;
1687 case IPL_TYPE_FCP:
1688 case IPL_TYPE_FCP_DUMP:
1689 ipl_info.data.fcp.dev_id.ssid = 0;
1690 ipl_info.data.fcp.dev_id.devno = ipl_block.fcp.devno;
1691 ipl_info.data.fcp.wwpn = ipl_block.fcp.wwpn;
1692 ipl_info.data.fcp.lun = ipl_block.fcp.lun;
1693 break;
1694 case IPL_TYPE_NSS:
1695 case IPL_TYPE_UNKNOWN:
1696 /* We have no info to copy */
1697 break;
1698 }
1699 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
1700}
1701
1702void s390_reset_system(void)
1703{
1704 /* Disable prefixing */
1705 set_prefix(0);
1706
1707 /* Disable lowcore protection */
1708 __ctl_clear_bit(0, 28);
1709 diag_dma_ops.diag308_reset();
1710}
1711
1712#ifdef CONFIG_KEXEC_FILE
1713
1714int ipl_report_add_component(struct ipl_report *report, struct kexec_buf *kbuf,
1715 unsigned char flags, unsigned short cert)
1716{
1717 struct ipl_report_component *comp;
1718
1719 comp = vzalloc(sizeof(*comp));
1720 if (!comp)
1721 return -ENOMEM;
1722 list_add_tail(&comp->list, &report->components);
1723
1724 comp->entry.addr = kbuf->mem;
1725 comp->entry.len = kbuf->memsz;
1726 comp->entry.flags = flags;
1727 comp->entry.certificate_index = cert;
1728
1729 report->size += sizeof(comp->entry);
1730
1731 return 0;
1732}
1733
1734int ipl_report_add_certificate(struct ipl_report *report, void *key,
1735 unsigned long addr, unsigned long len)
1736{
1737 struct ipl_report_certificate *cert;
1738
1739 cert = vzalloc(sizeof(*cert));
1740 if (!cert)
1741 return -ENOMEM;
1742 list_add_tail(&cert->list, &report->certificates);
1743
1744 cert->entry.addr = addr;
1745 cert->entry.len = len;
1746 cert->key = key;
1747
1748 report->size += sizeof(cert->entry);
1749 report->size += cert->entry.len;
1750
1751 return 0;
1752}
1753
1754struct ipl_report *ipl_report_init(struct ipl_parameter_block *ipib)
1755{
1756 struct ipl_report *report;
1757
1758 report = vzalloc(sizeof(*report));
1759 if (!report)
1760 return ERR_PTR(-ENOMEM);
1761
1762 report->ipib = ipib;
1763 INIT_LIST_HEAD(&report->components);
1764 INIT_LIST_HEAD(&report->certificates);
1765
1766 report->size = ALIGN(ipib->hdr.len, 8);
1767 report->size += sizeof(struct ipl_rl_hdr);
1768 report->size += sizeof(struct ipl_rb_components);
1769 report->size += sizeof(struct ipl_rb_certificates);
1770
1771 return report;
1772}
1773
1774void *ipl_report_finish(struct ipl_report *report)
1775{
1776 struct ipl_report_certificate *cert;
1777 struct ipl_report_component *comp;
1778 struct ipl_rb_certificates *certs;
1779 struct ipl_parameter_block *ipib;
1780 struct ipl_rb_components *comps;
1781 struct ipl_rl_hdr *rl_hdr;
1782 void *buf, *ptr;
1783
1784 buf = vzalloc(report->size);
1785 if (!buf)
1786 return ERR_PTR(-ENOMEM);
1787 ptr = buf;
1788
1789 memcpy(ptr, report->ipib, report->ipib->hdr.len);
1790 ipib = ptr;
1791 if (ipl_secure_flag)
1792 ipib->hdr.flags |= IPL_PL_FLAG_SIPL;
1793 ipib->hdr.flags |= IPL_PL_FLAG_IPLSR;
1794 ptr += report->ipib->hdr.len;
1795 ptr = PTR_ALIGN(ptr, 8);
1796
1797 rl_hdr = ptr;
1798 ptr += sizeof(*rl_hdr);
1799
1800 comps = ptr;
1801 comps->rbt = IPL_RBT_COMPONENTS;
1802 ptr += sizeof(*comps);
1803 list_for_each_entry(comp, &report->components, list) {
1804 memcpy(ptr, &comp->entry, sizeof(comp->entry));
1805 ptr += sizeof(comp->entry);
1806 }
1807 comps->len = ptr - (void *)comps;
1808
1809 certs = ptr;
1810 certs->rbt = IPL_RBT_CERTIFICATES;
1811 ptr += sizeof(*certs);
1812 list_for_each_entry(cert, &report->certificates, list) {
1813 memcpy(ptr, &cert->entry, sizeof(cert->entry));
1814 ptr += sizeof(cert->entry);
1815 }
1816 certs->len = ptr - (void *)certs;
1817 rl_hdr->len = ptr - (void *)rl_hdr;
1818
1819 list_for_each_entry(cert, &report->certificates, list) {
1820 memcpy(ptr, cert->key, cert->entry.len);
1821 ptr += cert->entry.len;
1822 }
1823
1824 BUG_ON(ptr > buf + report->size);
1825 return buf;
1826}
1827
1828int ipl_report_free(struct ipl_report *report)
1829{
1830 struct ipl_report_component *comp, *ncomp;
1831 struct ipl_report_certificate *cert, *ncert;
1832
1833 list_for_each_entry_safe(comp, ncomp, &report->components, list)
1834 vfree(comp);
1835
1836 list_for_each_entry_safe(cert, ncert, &report->certificates, list)
1837 vfree(cert);
1838
1839 vfree(report);
1840
1841 return 0;
1842}
1843
1844#endif
1/*
2 * arch/s390/kernel/ipl.c
3 * ipl/reipl/dump support for Linux on s390.
4 *
5 * Copyright IBM Corp. 2005,2007
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 <asm/ipl.h>
20#include <asm/smp.h>
21#include <asm/setup.h>
22#include <asm/cpcmd.h>
23#include <asm/cio.h>
24#include <asm/ebcdic.h>
25#include <asm/reset.h>
26#include <asm/sclp.h>
27#include <asm/sigp.h>
28#include <asm/checksum.h>
29
30#define IPL_PARM_BLOCK_VERSION 0
31
32#define IPL_UNKNOWN_STR "unknown"
33#define IPL_CCW_STR "ccw"
34#define IPL_FCP_STR "fcp"
35#define IPL_FCP_DUMP_STR "fcp_dump"
36#define IPL_NSS_STR "nss"
37
38#define DUMP_CCW_STR "ccw"
39#define DUMP_FCP_STR "fcp"
40#define DUMP_NONE_STR "none"
41
42/*
43 * Four shutdown trigger types are supported:
44 * - panic
45 * - halt
46 * - power off
47 * - reipl
48 * - restart
49 */
50#define ON_PANIC_STR "on_panic"
51#define ON_HALT_STR "on_halt"
52#define ON_POFF_STR "on_poff"
53#define ON_REIPL_STR "on_reboot"
54#define ON_RESTART_STR "on_restart"
55
56struct shutdown_action;
57struct shutdown_trigger {
58 char *name;
59 struct shutdown_action *action;
60};
61
62/*
63 * The following shutdown action types are supported:
64 */
65#define SHUTDOWN_ACTION_IPL_STR "ipl"
66#define SHUTDOWN_ACTION_REIPL_STR "reipl"
67#define SHUTDOWN_ACTION_DUMP_STR "dump"
68#define SHUTDOWN_ACTION_VMCMD_STR "vmcmd"
69#define SHUTDOWN_ACTION_STOP_STR "stop"
70#define SHUTDOWN_ACTION_DUMP_REIPL_STR "dump_reipl"
71
72struct shutdown_action {
73 char *name;
74 void (*fn) (struct shutdown_trigger *trigger);
75 int (*init) (void);
76 int init_rc;
77};
78
79static char *ipl_type_str(enum ipl_type type)
80{
81 switch (type) {
82 case IPL_TYPE_CCW:
83 return IPL_CCW_STR;
84 case IPL_TYPE_FCP:
85 return IPL_FCP_STR;
86 case IPL_TYPE_FCP_DUMP:
87 return IPL_FCP_DUMP_STR;
88 case IPL_TYPE_NSS:
89 return IPL_NSS_STR;
90 case IPL_TYPE_UNKNOWN:
91 default:
92 return IPL_UNKNOWN_STR;
93 }
94}
95
96enum dump_type {
97 DUMP_TYPE_NONE = 1,
98 DUMP_TYPE_CCW = 2,
99 DUMP_TYPE_FCP = 4,
100};
101
102static char *dump_type_str(enum dump_type type)
103{
104 switch (type) {
105 case DUMP_TYPE_NONE:
106 return DUMP_NONE_STR;
107 case DUMP_TYPE_CCW:
108 return DUMP_CCW_STR;
109 case DUMP_TYPE_FCP:
110 return DUMP_FCP_STR;
111 default:
112 return NULL;
113 }
114}
115
116/*
117 * Must be in data section since the bss section
118 * is not cleared when these are accessed.
119 */
120static u16 ipl_devno __attribute__((__section__(".data"))) = 0;
121u32 ipl_flags __attribute__((__section__(".data"))) = 0;
122
123enum ipl_method {
124 REIPL_METHOD_CCW_CIO,
125 REIPL_METHOD_CCW_DIAG,
126 REIPL_METHOD_CCW_VM,
127 REIPL_METHOD_FCP_RO_DIAG,
128 REIPL_METHOD_FCP_RW_DIAG,
129 REIPL_METHOD_FCP_RO_VM,
130 REIPL_METHOD_FCP_DUMP,
131 REIPL_METHOD_NSS,
132 REIPL_METHOD_NSS_DIAG,
133 REIPL_METHOD_DEFAULT,
134};
135
136enum dump_method {
137 DUMP_METHOD_NONE,
138 DUMP_METHOD_CCW_CIO,
139 DUMP_METHOD_CCW_DIAG,
140 DUMP_METHOD_CCW_VM,
141 DUMP_METHOD_FCP_DIAG,
142};
143
144static int diag308_set_works = 0;
145
146static struct ipl_parameter_block ipl_block;
147
148static int reipl_capabilities = IPL_TYPE_UNKNOWN;
149
150static enum ipl_type reipl_type = IPL_TYPE_UNKNOWN;
151static enum ipl_method reipl_method = REIPL_METHOD_DEFAULT;
152static struct ipl_parameter_block *reipl_block_fcp;
153static struct ipl_parameter_block *reipl_block_ccw;
154static struct ipl_parameter_block *reipl_block_nss;
155static struct ipl_parameter_block *reipl_block_actual;
156
157static int dump_capabilities = DUMP_TYPE_NONE;
158static enum dump_type dump_type = DUMP_TYPE_NONE;
159static enum dump_method dump_method = DUMP_METHOD_NONE;
160static struct ipl_parameter_block *dump_block_fcp;
161static struct ipl_parameter_block *dump_block_ccw;
162
163static struct sclp_ipl_info sclp_ipl_info;
164
165int diag308(unsigned long subcode, void *addr)
166{
167 register unsigned long _addr asm("0") = (unsigned long) addr;
168 register unsigned long _rc asm("1") = 0;
169
170 asm volatile(
171 " diag %0,%2,0x308\n"
172 "0:\n"
173 EX_TABLE(0b,0b)
174 : "+d" (_addr), "+d" (_rc)
175 : "d" (subcode) : "cc", "memory");
176 return _rc;
177}
178EXPORT_SYMBOL_GPL(diag308);
179
180/* SYSFS */
181
182#define DEFINE_IPL_ATTR_RO(_prefix, _name, _format, _value) \
183static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj, \
184 struct kobj_attribute *attr, \
185 char *page) \
186{ \
187 return sprintf(page, _format, _value); \
188} \
189static struct kobj_attribute sys_##_prefix##_##_name##_attr = \
190 __ATTR(_name, S_IRUGO, sys_##_prefix##_##_name##_show, NULL);
191
192#define DEFINE_IPL_ATTR_RW(_prefix, _name, _fmt_out, _fmt_in, _value) \
193static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj, \
194 struct kobj_attribute *attr, \
195 char *page) \
196{ \
197 return sprintf(page, _fmt_out, \
198 (unsigned long long) _value); \
199} \
200static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj, \
201 struct kobj_attribute *attr, \
202 const char *buf, size_t len) \
203{ \
204 unsigned long long value; \
205 if (sscanf(buf, _fmt_in, &value) != 1) \
206 return -EINVAL; \
207 _value = value; \
208 return len; \
209} \
210static struct kobj_attribute sys_##_prefix##_##_name##_attr = \
211 __ATTR(_name,(S_IRUGO | S_IWUSR), \
212 sys_##_prefix##_##_name##_show, \
213 sys_##_prefix##_##_name##_store);
214
215#define DEFINE_IPL_ATTR_STR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)\
216static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj, \
217 struct kobj_attribute *attr, \
218 char *page) \
219{ \
220 return sprintf(page, _fmt_out, _value); \
221} \
222static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj, \
223 struct kobj_attribute *attr, \
224 const char *buf, size_t len) \
225{ \
226 strncpy(_value, buf, sizeof(_value) - 1); \
227 strim(_value); \
228 return len; \
229} \
230static struct kobj_attribute sys_##_prefix##_##_name##_attr = \
231 __ATTR(_name,(S_IRUGO | S_IWUSR), \
232 sys_##_prefix##_##_name##_show, \
233 sys_##_prefix##_##_name##_store);
234
235static void make_attrs_ro(struct attribute **attrs)
236{
237 while (*attrs) {
238 (*attrs)->mode = S_IRUGO;
239 attrs++;
240 }
241}
242
243/*
244 * ipl section
245 */
246
247static __init enum ipl_type get_ipl_type(void)
248{
249 struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
250
251 if (ipl_flags & IPL_NSS_VALID)
252 return IPL_TYPE_NSS;
253 if (!(ipl_flags & IPL_DEVNO_VALID))
254 return IPL_TYPE_UNKNOWN;
255 if (!(ipl_flags & IPL_PARMBLOCK_VALID))
256 return IPL_TYPE_CCW;
257 if (ipl->hdr.version > IPL_MAX_SUPPORTED_VERSION)
258 return IPL_TYPE_UNKNOWN;
259 if (ipl->hdr.pbt != DIAG308_IPL_TYPE_FCP)
260 return IPL_TYPE_UNKNOWN;
261 if (ipl->ipl_info.fcp.opt == DIAG308_IPL_OPT_DUMP)
262 return IPL_TYPE_FCP_DUMP;
263 return IPL_TYPE_FCP;
264}
265
266struct ipl_info ipl_info;
267EXPORT_SYMBOL_GPL(ipl_info);
268
269static ssize_t ipl_type_show(struct kobject *kobj, struct kobj_attribute *attr,
270 char *page)
271{
272 return sprintf(page, "%s\n", ipl_type_str(ipl_info.type));
273}
274
275static struct kobj_attribute sys_ipl_type_attr = __ATTR_RO(ipl_type);
276
277/* VM IPL PARM routines */
278size_t reipl_get_ascii_vmparm(char *dest, size_t size,
279 const struct ipl_parameter_block *ipb)
280{
281 int i;
282 size_t len;
283 char has_lowercase = 0;
284
285 len = 0;
286 if ((ipb->ipl_info.ccw.vm_flags & DIAG308_VM_FLAGS_VP_VALID) &&
287 (ipb->ipl_info.ccw.vm_parm_len > 0)) {
288
289 len = min_t(size_t, size - 1, ipb->ipl_info.ccw.vm_parm_len);
290 memcpy(dest, ipb->ipl_info.ccw.vm_parm, len);
291 /* If at least one character is lowercase, we assume mixed
292 * case; otherwise we convert everything to lowercase.
293 */
294 for (i = 0; i < len; i++)
295 if ((dest[i] > 0x80 && dest[i] < 0x8a) || /* a-i */
296 (dest[i] > 0x90 && dest[i] < 0x9a) || /* j-r */
297 (dest[i] > 0xa1 && dest[i] < 0xaa)) { /* s-z */
298 has_lowercase = 1;
299 break;
300 }
301 if (!has_lowercase)
302 EBC_TOLOWER(dest, len);
303 EBCASC(dest, len);
304 }
305 dest[len] = 0;
306
307 return len;
308}
309
310size_t append_ipl_vmparm(char *dest, size_t size)
311{
312 size_t rc;
313
314 rc = 0;
315 if (diag308_set_works && (ipl_block.hdr.pbt == DIAG308_IPL_TYPE_CCW))
316 rc = reipl_get_ascii_vmparm(dest, size, &ipl_block);
317 else
318 dest[0] = 0;
319 return rc;
320}
321
322static ssize_t ipl_vm_parm_show(struct kobject *kobj,
323 struct kobj_attribute *attr, char *page)
324{
325 char parm[DIAG308_VMPARM_SIZE + 1] = {};
326
327 append_ipl_vmparm(parm, sizeof(parm));
328 return sprintf(page, "%s\n", parm);
329}
330
331static size_t scpdata_length(const char* buf, size_t count)
332{
333 while (count) {
334 if (buf[count - 1] != '\0' && buf[count - 1] != ' ')
335 break;
336 count--;
337 }
338 return count;
339}
340
341size_t reipl_append_ascii_scpdata(char *dest, size_t size,
342 const struct ipl_parameter_block *ipb)
343{
344 size_t count;
345 size_t i;
346 int has_lowercase;
347
348 count = min(size - 1, scpdata_length(ipb->ipl_info.fcp.scp_data,
349 ipb->ipl_info.fcp.scp_data_len));
350 if (!count)
351 goto out;
352
353 has_lowercase = 0;
354 for (i = 0; i < count; i++) {
355 if (!isascii(ipb->ipl_info.fcp.scp_data[i])) {
356 count = 0;
357 goto out;
358 }
359 if (!has_lowercase && islower(ipb->ipl_info.fcp.scp_data[i]))
360 has_lowercase = 1;
361 }
362
363 if (has_lowercase)
364 memcpy(dest, ipb->ipl_info.fcp.scp_data, count);
365 else
366 for (i = 0; i < count; i++)
367 dest[i] = tolower(ipb->ipl_info.fcp.scp_data[i]);
368out:
369 dest[count] = '\0';
370 return count;
371}
372
373size_t append_ipl_scpdata(char *dest, size_t len)
374{
375 size_t rc;
376
377 rc = 0;
378 if (ipl_block.hdr.pbt == DIAG308_IPL_TYPE_FCP)
379 rc = reipl_append_ascii_scpdata(dest, len, &ipl_block);
380 else
381 dest[0] = 0;
382 return rc;
383}
384
385
386static struct kobj_attribute sys_ipl_vm_parm_attr =
387 __ATTR(parm, S_IRUGO, ipl_vm_parm_show, NULL);
388
389static ssize_t sys_ipl_device_show(struct kobject *kobj,
390 struct kobj_attribute *attr, char *page)
391{
392 struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
393
394 switch (ipl_info.type) {
395 case IPL_TYPE_CCW:
396 return sprintf(page, "0.0.%04x\n", ipl_devno);
397 case IPL_TYPE_FCP:
398 case IPL_TYPE_FCP_DUMP:
399 return sprintf(page, "0.0.%04x\n", ipl->ipl_info.fcp.devno);
400 default:
401 return 0;
402 }
403}
404
405static struct kobj_attribute sys_ipl_device_attr =
406 __ATTR(device, S_IRUGO, sys_ipl_device_show, NULL);
407
408static ssize_t ipl_parameter_read(struct file *filp, struct kobject *kobj,
409 struct bin_attribute *attr, char *buf,
410 loff_t off, size_t count)
411{
412 return memory_read_from_buffer(buf, count, &off, IPL_PARMBLOCK_START,
413 IPL_PARMBLOCK_SIZE);
414}
415
416static struct bin_attribute ipl_parameter_attr = {
417 .attr = {
418 .name = "binary_parameter",
419 .mode = S_IRUGO,
420 },
421 .size = PAGE_SIZE,
422 .read = &ipl_parameter_read,
423};
424
425static ssize_t ipl_scp_data_read(struct file *filp, struct kobject *kobj,
426 struct bin_attribute *attr, char *buf,
427 loff_t off, size_t count)
428{
429 unsigned int size = IPL_PARMBLOCK_START->ipl_info.fcp.scp_data_len;
430 void *scp_data = &IPL_PARMBLOCK_START->ipl_info.fcp.scp_data;
431
432 return memory_read_from_buffer(buf, count, &off, scp_data, size);
433}
434
435static struct bin_attribute ipl_scp_data_attr = {
436 .attr = {
437 .name = "scp_data",
438 .mode = S_IRUGO,
439 },
440 .size = PAGE_SIZE,
441 .read = ipl_scp_data_read,
442};
443
444/* FCP ipl device attributes */
445
446DEFINE_IPL_ATTR_RO(ipl_fcp, wwpn, "0x%016llx\n", (unsigned long long)
447 IPL_PARMBLOCK_START->ipl_info.fcp.wwpn);
448DEFINE_IPL_ATTR_RO(ipl_fcp, lun, "0x%016llx\n", (unsigned long long)
449 IPL_PARMBLOCK_START->ipl_info.fcp.lun);
450DEFINE_IPL_ATTR_RO(ipl_fcp, bootprog, "%lld\n", (unsigned long long)
451 IPL_PARMBLOCK_START->ipl_info.fcp.bootprog);
452DEFINE_IPL_ATTR_RO(ipl_fcp, br_lba, "%lld\n", (unsigned long long)
453 IPL_PARMBLOCK_START->ipl_info.fcp.br_lba);
454
455static struct attribute *ipl_fcp_attrs[] = {
456 &sys_ipl_type_attr.attr,
457 &sys_ipl_device_attr.attr,
458 &sys_ipl_fcp_wwpn_attr.attr,
459 &sys_ipl_fcp_lun_attr.attr,
460 &sys_ipl_fcp_bootprog_attr.attr,
461 &sys_ipl_fcp_br_lba_attr.attr,
462 NULL,
463};
464
465static struct attribute_group ipl_fcp_attr_group = {
466 .attrs = ipl_fcp_attrs,
467};
468
469/* CCW ipl device attributes */
470
471static ssize_t ipl_ccw_loadparm_show(struct kobject *kobj,
472 struct kobj_attribute *attr, char *page)
473{
474 char loadparm[LOADPARM_LEN + 1] = {};
475
476 if (!sclp_ipl_info.is_valid)
477 return sprintf(page, "#unknown#\n");
478 memcpy(loadparm, &sclp_ipl_info.loadparm, LOADPARM_LEN);
479 EBCASC(loadparm, LOADPARM_LEN);
480 strim(loadparm);
481 return sprintf(page, "%s\n", loadparm);
482}
483
484static struct kobj_attribute sys_ipl_ccw_loadparm_attr =
485 __ATTR(loadparm, 0444, ipl_ccw_loadparm_show, NULL);
486
487static struct attribute *ipl_ccw_attrs_vm[] = {
488 &sys_ipl_type_attr.attr,
489 &sys_ipl_device_attr.attr,
490 &sys_ipl_ccw_loadparm_attr.attr,
491 &sys_ipl_vm_parm_attr.attr,
492 NULL,
493};
494
495static struct attribute *ipl_ccw_attrs_lpar[] = {
496 &sys_ipl_type_attr.attr,
497 &sys_ipl_device_attr.attr,
498 &sys_ipl_ccw_loadparm_attr.attr,
499 NULL,
500};
501
502static struct attribute_group ipl_ccw_attr_group_vm = {
503 .attrs = ipl_ccw_attrs_vm,
504};
505
506static struct attribute_group ipl_ccw_attr_group_lpar = {
507 .attrs = ipl_ccw_attrs_lpar
508};
509
510/* NSS ipl device attributes */
511
512DEFINE_IPL_ATTR_RO(ipl_nss, name, "%s\n", kernel_nss_name);
513
514static struct attribute *ipl_nss_attrs[] = {
515 &sys_ipl_type_attr.attr,
516 &sys_ipl_nss_name_attr.attr,
517 &sys_ipl_ccw_loadparm_attr.attr,
518 &sys_ipl_vm_parm_attr.attr,
519 NULL,
520};
521
522static struct attribute_group ipl_nss_attr_group = {
523 .attrs = ipl_nss_attrs,
524};
525
526/* UNKNOWN ipl device attributes */
527
528static struct attribute *ipl_unknown_attrs[] = {
529 &sys_ipl_type_attr.attr,
530 NULL,
531};
532
533static struct attribute_group ipl_unknown_attr_group = {
534 .attrs = ipl_unknown_attrs,
535};
536
537static struct kset *ipl_kset;
538
539static int __init ipl_register_fcp_files(void)
540{
541 int rc;
542
543 rc = sysfs_create_group(&ipl_kset->kobj, &ipl_fcp_attr_group);
544 if (rc)
545 goto out;
546 rc = sysfs_create_bin_file(&ipl_kset->kobj, &ipl_parameter_attr);
547 if (rc)
548 goto out_ipl_parm;
549 rc = sysfs_create_bin_file(&ipl_kset->kobj, &ipl_scp_data_attr);
550 if (!rc)
551 goto out;
552
553 sysfs_remove_bin_file(&ipl_kset->kobj, &ipl_parameter_attr);
554
555out_ipl_parm:
556 sysfs_remove_group(&ipl_kset->kobj, &ipl_fcp_attr_group);
557out:
558 return rc;
559}
560
561static void __ipl_run(void *unused)
562{
563 diag308(DIAG308_IPL, NULL);
564 if (MACHINE_IS_VM)
565 __cpcmd("IPL", NULL, 0, NULL);
566 else if (ipl_info.type == IPL_TYPE_CCW)
567 reipl_ccw_dev(&ipl_info.data.ccw.dev_id);
568}
569
570static void ipl_run(struct shutdown_trigger *trigger)
571{
572 smp_switch_to_ipl_cpu(__ipl_run, NULL);
573}
574
575static int __init ipl_init(void)
576{
577 int rc;
578
579 ipl_kset = kset_create_and_add("ipl", NULL, firmware_kobj);
580 if (!ipl_kset) {
581 rc = -ENOMEM;
582 goto out;
583 }
584 switch (ipl_info.type) {
585 case IPL_TYPE_CCW:
586 if (MACHINE_IS_VM)
587 rc = sysfs_create_group(&ipl_kset->kobj,
588 &ipl_ccw_attr_group_vm);
589 else
590 rc = sysfs_create_group(&ipl_kset->kobj,
591 &ipl_ccw_attr_group_lpar);
592 break;
593 case IPL_TYPE_FCP:
594 case IPL_TYPE_FCP_DUMP:
595 rc = ipl_register_fcp_files();
596 break;
597 case IPL_TYPE_NSS:
598 rc = sysfs_create_group(&ipl_kset->kobj, &ipl_nss_attr_group);
599 break;
600 default:
601 rc = sysfs_create_group(&ipl_kset->kobj,
602 &ipl_unknown_attr_group);
603 break;
604 }
605out:
606 if (rc)
607 panic("ipl_init failed: rc = %i\n", rc);
608
609 return 0;
610}
611
612static struct shutdown_action __refdata ipl_action = {
613 .name = SHUTDOWN_ACTION_IPL_STR,
614 .fn = ipl_run,
615 .init = ipl_init,
616};
617
618/*
619 * reipl shutdown action: Reboot Linux on shutdown.
620 */
621
622/* VM IPL PARM attributes */
623static ssize_t reipl_generic_vmparm_show(struct ipl_parameter_block *ipb,
624 char *page)
625{
626 char vmparm[DIAG308_VMPARM_SIZE + 1] = {};
627
628 reipl_get_ascii_vmparm(vmparm, sizeof(vmparm), ipb);
629 return sprintf(page, "%s\n", vmparm);
630}
631
632static ssize_t reipl_generic_vmparm_store(struct ipl_parameter_block *ipb,
633 size_t vmparm_max,
634 const char *buf, size_t len)
635{
636 int i, ip_len;
637
638 /* ignore trailing newline */
639 ip_len = len;
640 if ((len > 0) && (buf[len - 1] == '\n'))
641 ip_len--;
642
643 if (ip_len > vmparm_max)
644 return -EINVAL;
645
646 /* parm is used to store kernel options, check for common chars */
647 for (i = 0; i < ip_len; i++)
648 if (!(isalnum(buf[i]) || isascii(buf[i]) || isprint(buf[i])))
649 return -EINVAL;
650
651 memset(ipb->ipl_info.ccw.vm_parm, 0, DIAG308_VMPARM_SIZE);
652 ipb->ipl_info.ccw.vm_parm_len = ip_len;
653 if (ip_len > 0) {
654 ipb->ipl_info.ccw.vm_flags |= DIAG308_VM_FLAGS_VP_VALID;
655 memcpy(ipb->ipl_info.ccw.vm_parm, buf, ip_len);
656 ASCEBC(ipb->ipl_info.ccw.vm_parm, ip_len);
657 } else {
658 ipb->ipl_info.ccw.vm_flags &= ~DIAG308_VM_FLAGS_VP_VALID;
659 }
660
661 return len;
662}
663
664/* NSS wrapper */
665static ssize_t reipl_nss_vmparm_show(struct kobject *kobj,
666 struct kobj_attribute *attr, char *page)
667{
668 return reipl_generic_vmparm_show(reipl_block_nss, page);
669}
670
671static ssize_t reipl_nss_vmparm_store(struct kobject *kobj,
672 struct kobj_attribute *attr,
673 const char *buf, size_t len)
674{
675 return reipl_generic_vmparm_store(reipl_block_nss, 56, buf, len);
676}
677
678/* CCW wrapper */
679static ssize_t reipl_ccw_vmparm_show(struct kobject *kobj,
680 struct kobj_attribute *attr, char *page)
681{
682 return reipl_generic_vmparm_show(reipl_block_ccw, page);
683}
684
685static ssize_t reipl_ccw_vmparm_store(struct kobject *kobj,
686 struct kobj_attribute *attr,
687 const char *buf, size_t len)
688{
689 return reipl_generic_vmparm_store(reipl_block_ccw, 64, buf, len);
690}
691
692static struct kobj_attribute sys_reipl_nss_vmparm_attr =
693 __ATTR(parm, S_IRUGO | S_IWUSR, reipl_nss_vmparm_show,
694 reipl_nss_vmparm_store);
695static struct kobj_attribute sys_reipl_ccw_vmparm_attr =
696 __ATTR(parm, S_IRUGO | S_IWUSR, reipl_ccw_vmparm_show,
697 reipl_ccw_vmparm_store);
698
699/* FCP reipl device attributes */
700
701static ssize_t reipl_fcp_scpdata_read(struct file *filp, struct kobject *kobj,
702 struct bin_attribute *attr,
703 char *buf, loff_t off, size_t count)
704{
705 size_t size = reipl_block_fcp->ipl_info.fcp.scp_data_len;
706 void *scp_data = reipl_block_fcp->ipl_info.fcp.scp_data;
707
708 return memory_read_from_buffer(buf, count, &off, scp_data, size);
709}
710
711static ssize_t reipl_fcp_scpdata_write(struct file *filp, struct kobject *kobj,
712 struct bin_attribute *attr,
713 char *buf, loff_t off, size_t count)
714{
715 size_t padding;
716 size_t scpdata_len;
717
718 if (off < 0)
719 return -EINVAL;
720
721 if (off >= DIAG308_SCPDATA_SIZE)
722 return -ENOSPC;
723
724 if (count > DIAG308_SCPDATA_SIZE - off)
725 count = DIAG308_SCPDATA_SIZE - off;
726
727 memcpy(reipl_block_fcp->ipl_info.fcp.scp_data, buf + off, count);
728 scpdata_len = off + count;
729
730 if (scpdata_len % 8) {
731 padding = 8 - (scpdata_len % 8);
732 memset(reipl_block_fcp->ipl_info.fcp.scp_data + scpdata_len,
733 0, padding);
734 scpdata_len += padding;
735 }
736
737 reipl_block_fcp->ipl_info.fcp.scp_data_len = scpdata_len;
738 reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN + scpdata_len;
739 reipl_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN + scpdata_len;
740
741 return count;
742}
743
744static struct bin_attribute sys_reipl_fcp_scp_data_attr = {
745 .attr = {
746 .name = "scp_data",
747 .mode = S_IRUGO | S_IWUSR,
748 },
749 .size = PAGE_SIZE,
750 .read = reipl_fcp_scpdata_read,
751 .write = reipl_fcp_scpdata_write,
752};
753
754DEFINE_IPL_ATTR_RW(reipl_fcp, wwpn, "0x%016llx\n", "%016llx\n",
755 reipl_block_fcp->ipl_info.fcp.wwpn);
756DEFINE_IPL_ATTR_RW(reipl_fcp, lun, "0x%016llx\n", "%016llx\n",
757 reipl_block_fcp->ipl_info.fcp.lun);
758DEFINE_IPL_ATTR_RW(reipl_fcp, bootprog, "%lld\n", "%lld\n",
759 reipl_block_fcp->ipl_info.fcp.bootprog);
760DEFINE_IPL_ATTR_RW(reipl_fcp, br_lba, "%lld\n", "%lld\n",
761 reipl_block_fcp->ipl_info.fcp.br_lba);
762DEFINE_IPL_ATTR_RW(reipl_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
763 reipl_block_fcp->ipl_info.fcp.devno);
764
765static struct attribute *reipl_fcp_attrs[] = {
766 &sys_reipl_fcp_device_attr.attr,
767 &sys_reipl_fcp_wwpn_attr.attr,
768 &sys_reipl_fcp_lun_attr.attr,
769 &sys_reipl_fcp_bootprog_attr.attr,
770 &sys_reipl_fcp_br_lba_attr.attr,
771 NULL,
772};
773
774static struct attribute_group reipl_fcp_attr_group = {
775 .attrs = reipl_fcp_attrs,
776};
777
778/* CCW reipl device attributes */
779
780DEFINE_IPL_ATTR_RW(reipl_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
781 reipl_block_ccw->ipl_info.ccw.devno);
782
783static void reipl_get_ascii_loadparm(char *loadparm,
784 struct ipl_parameter_block *ibp)
785{
786 memcpy(loadparm, ibp->ipl_info.ccw.load_parm, LOADPARM_LEN);
787 EBCASC(loadparm, LOADPARM_LEN);
788 loadparm[LOADPARM_LEN] = 0;
789 strim(loadparm);
790}
791
792static ssize_t reipl_generic_loadparm_show(struct ipl_parameter_block *ipb,
793 char *page)
794{
795 char buf[LOADPARM_LEN + 1];
796
797 reipl_get_ascii_loadparm(buf, ipb);
798 return sprintf(page, "%s\n", buf);
799}
800
801static ssize_t reipl_generic_loadparm_store(struct ipl_parameter_block *ipb,
802 const char *buf, size_t len)
803{
804 int i, lp_len;
805
806 /* ignore trailing newline */
807 lp_len = len;
808 if ((len > 0) && (buf[len - 1] == '\n'))
809 lp_len--;
810 /* loadparm can have max 8 characters and must not start with a blank */
811 if ((lp_len > LOADPARM_LEN) || ((lp_len > 0) && (buf[0] == ' ')))
812 return -EINVAL;
813 /* loadparm can only contain "a-z,A-Z,0-9,SP,." */
814 for (i = 0; i < lp_len; i++) {
815 if (isalpha(buf[i]) || isdigit(buf[i]) || (buf[i] == ' ') ||
816 (buf[i] == '.'))
817 continue;
818 return -EINVAL;
819 }
820 /* initialize loadparm with blanks */
821 memset(ipb->ipl_info.ccw.load_parm, ' ', LOADPARM_LEN);
822 /* copy and convert to ebcdic */
823 memcpy(ipb->ipl_info.ccw.load_parm, buf, lp_len);
824 ASCEBC(ipb->ipl_info.ccw.load_parm, LOADPARM_LEN);
825 return len;
826}
827
828/* NSS wrapper */
829static ssize_t reipl_nss_loadparm_show(struct kobject *kobj,
830 struct kobj_attribute *attr, char *page)
831{
832 return reipl_generic_loadparm_show(reipl_block_nss, page);
833}
834
835static ssize_t reipl_nss_loadparm_store(struct kobject *kobj,
836 struct kobj_attribute *attr,
837 const char *buf, size_t len)
838{
839 return reipl_generic_loadparm_store(reipl_block_nss, buf, len);
840}
841
842/* CCW wrapper */
843static ssize_t reipl_ccw_loadparm_show(struct kobject *kobj,
844 struct kobj_attribute *attr, char *page)
845{
846 return reipl_generic_loadparm_show(reipl_block_ccw, page);
847}
848
849static ssize_t reipl_ccw_loadparm_store(struct kobject *kobj,
850 struct kobj_attribute *attr,
851 const char *buf, size_t len)
852{
853 return reipl_generic_loadparm_store(reipl_block_ccw, buf, len);
854}
855
856static struct kobj_attribute sys_reipl_ccw_loadparm_attr =
857 __ATTR(loadparm, S_IRUGO | S_IWUSR, reipl_ccw_loadparm_show,
858 reipl_ccw_loadparm_store);
859
860static struct attribute *reipl_ccw_attrs_vm[] = {
861 &sys_reipl_ccw_device_attr.attr,
862 &sys_reipl_ccw_loadparm_attr.attr,
863 &sys_reipl_ccw_vmparm_attr.attr,
864 NULL,
865};
866
867static struct attribute *reipl_ccw_attrs_lpar[] = {
868 &sys_reipl_ccw_device_attr.attr,
869 &sys_reipl_ccw_loadparm_attr.attr,
870 NULL,
871};
872
873static struct attribute_group reipl_ccw_attr_group_vm = {
874 .name = IPL_CCW_STR,
875 .attrs = reipl_ccw_attrs_vm,
876};
877
878static struct attribute_group reipl_ccw_attr_group_lpar = {
879 .name = IPL_CCW_STR,
880 .attrs = reipl_ccw_attrs_lpar,
881};
882
883
884/* NSS reipl device attributes */
885static void reipl_get_ascii_nss_name(char *dst,
886 struct ipl_parameter_block *ipb)
887{
888 memcpy(dst, ipb->ipl_info.ccw.nss_name, NSS_NAME_SIZE);
889 EBCASC(dst, NSS_NAME_SIZE);
890 dst[NSS_NAME_SIZE] = 0;
891}
892
893static ssize_t reipl_nss_name_show(struct kobject *kobj,
894 struct kobj_attribute *attr, char *page)
895{
896 char nss_name[NSS_NAME_SIZE + 1] = {};
897
898 reipl_get_ascii_nss_name(nss_name, reipl_block_nss);
899 return sprintf(page, "%s\n", nss_name);
900}
901
902static ssize_t reipl_nss_name_store(struct kobject *kobj,
903 struct kobj_attribute *attr,
904 const char *buf, size_t len)
905{
906 int nss_len;
907
908 /* ignore trailing newline */
909 nss_len = len;
910 if ((len > 0) && (buf[len - 1] == '\n'))
911 nss_len--;
912
913 if (nss_len > NSS_NAME_SIZE)
914 return -EINVAL;
915
916 memset(reipl_block_nss->ipl_info.ccw.nss_name, 0x40, NSS_NAME_SIZE);
917 if (nss_len > 0) {
918 reipl_block_nss->ipl_info.ccw.vm_flags |=
919 DIAG308_VM_FLAGS_NSS_VALID;
920 memcpy(reipl_block_nss->ipl_info.ccw.nss_name, buf, nss_len);
921 ASCEBC(reipl_block_nss->ipl_info.ccw.nss_name, nss_len);
922 EBC_TOUPPER(reipl_block_nss->ipl_info.ccw.nss_name, nss_len);
923 } else {
924 reipl_block_nss->ipl_info.ccw.vm_flags &=
925 ~DIAG308_VM_FLAGS_NSS_VALID;
926 }
927
928 return len;
929}
930
931static struct kobj_attribute sys_reipl_nss_name_attr =
932 __ATTR(name, S_IRUGO | S_IWUSR, reipl_nss_name_show,
933 reipl_nss_name_store);
934
935static struct kobj_attribute sys_reipl_nss_loadparm_attr =
936 __ATTR(loadparm, S_IRUGO | S_IWUSR, reipl_nss_loadparm_show,
937 reipl_nss_loadparm_store);
938
939static struct attribute *reipl_nss_attrs[] = {
940 &sys_reipl_nss_name_attr.attr,
941 &sys_reipl_nss_loadparm_attr.attr,
942 &sys_reipl_nss_vmparm_attr.attr,
943 NULL,
944};
945
946static struct attribute_group reipl_nss_attr_group = {
947 .name = IPL_NSS_STR,
948 .attrs = reipl_nss_attrs,
949};
950
951/* reipl type */
952
953static int reipl_set_type(enum ipl_type type)
954{
955 if (!(reipl_capabilities & type))
956 return -EINVAL;
957
958 switch(type) {
959 case IPL_TYPE_CCW:
960 if (diag308_set_works)
961 reipl_method = REIPL_METHOD_CCW_DIAG;
962 else if (MACHINE_IS_VM)
963 reipl_method = REIPL_METHOD_CCW_VM;
964 else
965 reipl_method = REIPL_METHOD_CCW_CIO;
966 reipl_block_actual = reipl_block_ccw;
967 break;
968 case IPL_TYPE_FCP:
969 if (diag308_set_works)
970 reipl_method = REIPL_METHOD_FCP_RW_DIAG;
971 else if (MACHINE_IS_VM)
972 reipl_method = REIPL_METHOD_FCP_RO_VM;
973 else
974 reipl_method = REIPL_METHOD_FCP_RO_DIAG;
975 reipl_block_actual = reipl_block_fcp;
976 break;
977 case IPL_TYPE_FCP_DUMP:
978 reipl_method = REIPL_METHOD_FCP_DUMP;
979 break;
980 case IPL_TYPE_NSS:
981 if (diag308_set_works)
982 reipl_method = REIPL_METHOD_NSS_DIAG;
983 else
984 reipl_method = REIPL_METHOD_NSS;
985 reipl_block_actual = reipl_block_nss;
986 break;
987 case IPL_TYPE_UNKNOWN:
988 reipl_method = REIPL_METHOD_DEFAULT;
989 break;
990 default:
991 BUG();
992 }
993 reipl_type = type;
994 return 0;
995}
996
997static ssize_t reipl_type_show(struct kobject *kobj,
998 struct kobj_attribute *attr, char *page)
999{
1000 return sprintf(page, "%s\n", ipl_type_str(reipl_type));
1001}
1002
1003static ssize_t reipl_type_store(struct kobject *kobj,
1004 struct kobj_attribute *attr,
1005 const char *buf, size_t len)
1006{
1007 int rc = -EINVAL;
1008
1009 if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
1010 rc = reipl_set_type(IPL_TYPE_CCW);
1011 else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
1012 rc = reipl_set_type(IPL_TYPE_FCP);
1013 else if (strncmp(buf, IPL_NSS_STR, strlen(IPL_NSS_STR)) == 0)
1014 rc = reipl_set_type(IPL_TYPE_NSS);
1015 return (rc != 0) ? rc : len;
1016}
1017
1018static struct kobj_attribute reipl_type_attr =
1019 __ATTR(reipl_type, 0644, reipl_type_show, reipl_type_store);
1020
1021static struct kset *reipl_kset;
1022static struct kset *reipl_fcp_kset;
1023
1024static void get_ipl_string(char *dst, struct ipl_parameter_block *ipb,
1025 const enum ipl_method m)
1026{
1027 char loadparm[LOADPARM_LEN + 1] = {};
1028 char vmparm[DIAG308_VMPARM_SIZE + 1] = {};
1029 char nss_name[NSS_NAME_SIZE + 1] = {};
1030 size_t pos = 0;
1031
1032 reipl_get_ascii_loadparm(loadparm, ipb);
1033 reipl_get_ascii_nss_name(nss_name, ipb);
1034 reipl_get_ascii_vmparm(vmparm, sizeof(vmparm), ipb);
1035
1036 switch (m) {
1037 case REIPL_METHOD_CCW_VM:
1038 pos = sprintf(dst, "IPL %X CLEAR", ipb->ipl_info.ccw.devno);
1039 break;
1040 case REIPL_METHOD_NSS:
1041 pos = sprintf(dst, "IPL %s", nss_name);
1042 break;
1043 default:
1044 break;
1045 }
1046 if (strlen(loadparm) > 0)
1047 pos += sprintf(dst + pos, " LOADPARM '%s'", loadparm);
1048 if (strlen(vmparm) > 0)
1049 sprintf(dst + pos, " PARM %s", vmparm);
1050}
1051
1052static void __reipl_run(void *unused)
1053{
1054 struct ccw_dev_id devid;
1055 static char buf[128];
1056
1057 switch (reipl_method) {
1058 case REIPL_METHOD_CCW_CIO:
1059 devid.devno = reipl_block_ccw->ipl_info.ccw.devno;
1060 devid.ssid = 0;
1061 reipl_ccw_dev(&devid);
1062 break;
1063 case REIPL_METHOD_CCW_VM:
1064 get_ipl_string(buf, reipl_block_ccw, REIPL_METHOD_CCW_VM);
1065 __cpcmd(buf, NULL, 0, NULL);
1066 break;
1067 case REIPL_METHOD_CCW_DIAG:
1068 diag308(DIAG308_SET, reipl_block_ccw);
1069 diag308(DIAG308_IPL, NULL);
1070 break;
1071 case REIPL_METHOD_FCP_RW_DIAG:
1072 diag308(DIAG308_SET, reipl_block_fcp);
1073 diag308(DIAG308_IPL, NULL);
1074 break;
1075 case REIPL_METHOD_FCP_RO_DIAG:
1076 diag308(DIAG308_IPL, NULL);
1077 break;
1078 case REIPL_METHOD_FCP_RO_VM:
1079 __cpcmd("IPL", NULL, 0, NULL);
1080 break;
1081 case REIPL_METHOD_NSS_DIAG:
1082 diag308(DIAG308_SET, reipl_block_nss);
1083 diag308(DIAG308_IPL, NULL);
1084 break;
1085 case REIPL_METHOD_NSS:
1086 get_ipl_string(buf, reipl_block_nss, REIPL_METHOD_NSS);
1087 __cpcmd(buf, NULL, 0, NULL);
1088 break;
1089 case REIPL_METHOD_DEFAULT:
1090 if (MACHINE_IS_VM)
1091 __cpcmd("IPL", NULL, 0, NULL);
1092 diag308(DIAG308_IPL, NULL);
1093 break;
1094 case REIPL_METHOD_FCP_DUMP:
1095 break;
1096 }
1097 disabled_wait((unsigned long) __builtin_return_address(0));
1098}
1099
1100static void reipl_run(struct shutdown_trigger *trigger)
1101{
1102 smp_switch_to_ipl_cpu(__reipl_run, NULL);
1103}
1104
1105static void reipl_block_ccw_init(struct ipl_parameter_block *ipb)
1106{
1107 ipb->hdr.len = IPL_PARM_BLK_CCW_LEN;
1108 ipb->hdr.version = IPL_PARM_BLOCK_VERSION;
1109 ipb->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
1110 ipb->hdr.pbt = DIAG308_IPL_TYPE_CCW;
1111}
1112
1113static void reipl_block_ccw_fill_parms(struct ipl_parameter_block *ipb)
1114{
1115 /* LOADPARM */
1116 /* check if read scp info worked and set loadparm */
1117 if (sclp_ipl_info.is_valid)
1118 memcpy(ipb->ipl_info.ccw.load_parm,
1119 &sclp_ipl_info.loadparm, LOADPARM_LEN);
1120 else
1121 /* read scp info failed: set empty loadparm (EBCDIC blanks) */
1122 memset(ipb->ipl_info.ccw.load_parm, 0x40, LOADPARM_LEN);
1123 ipb->hdr.flags = DIAG308_FLAGS_LP_VALID;
1124
1125 /* VM PARM */
1126 if (MACHINE_IS_VM && diag308_set_works &&
1127 (ipl_block.ipl_info.ccw.vm_flags & DIAG308_VM_FLAGS_VP_VALID)) {
1128
1129 ipb->ipl_info.ccw.vm_flags |= DIAG308_VM_FLAGS_VP_VALID;
1130 ipb->ipl_info.ccw.vm_parm_len =
1131 ipl_block.ipl_info.ccw.vm_parm_len;
1132 memcpy(ipb->ipl_info.ccw.vm_parm,
1133 ipl_block.ipl_info.ccw.vm_parm, DIAG308_VMPARM_SIZE);
1134 }
1135}
1136
1137static int __init reipl_nss_init(void)
1138{
1139 int rc;
1140
1141 if (!MACHINE_IS_VM)
1142 return 0;
1143
1144 reipl_block_nss = (void *) get_zeroed_page(GFP_KERNEL);
1145 if (!reipl_block_nss)
1146 return -ENOMEM;
1147
1148 if (!diag308_set_works)
1149 sys_reipl_nss_vmparm_attr.attr.mode = S_IRUGO;
1150
1151 rc = sysfs_create_group(&reipl_kset->kobj, &reipl_nss_attr_group);
1152 if (rc)
1153 return rc;
1154
1155 reipl_block_ccw_init(reipl_block_nss);
1156 if (ipl_info.type == IPL_TYPE_NSS) {
1157 memset(reipl_block_nss->ipl_info.ccw.nss_name,
1158 ' ', NSS_NAME_SIZE);
1159 memcpy(reipl_block_nss->ipl_info.ccw.nss_name,
1160 kernel_nss_name, strlen(kernel_nss_name));
1161 ASCEBC(reipl_block_nss->ipl_info.ccw.nss_name, NSS_NAME_SIZE);
1162 reipl_block_nss->ipl_info.ccw.vm_flags |=
1163 DIAG308_VM_FLAGS_NSS_VALID;
1164
1165 reipl_block_ccw_fill_parms(reipl_block_nss);
1166 }
1167
1168 reipl_capabilities |= IPL_TYPE_NSS;
1169 return 0;
1170}
1171
1172static int __init reipl_ccw_init(void)
1173{
1174 int rc;
1175
1176 reipl_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
1177 if (!reipl_block_ccw)
1178 return -ENOMEM;
1179
1180 if (MACHINE_IS_VM) {
1181 if (!diag308_set_works)
1182 sys_reipl_ccw_vmparm_attr.attr.mode = S_IRUGO;
1183 rc = sysfs_create_group(&reipl_kset->kobj,
1184 &reipl_ccw_attr_group_vm);
1185 } else {
1186 if(!diag308_set_works)
1187 sys_reipl_ccw_loadparm_attr.attr.mode = S_IRUGO;
1188 rc = sysfs_create_group(&reipl_kset->kobj,
1189 &reipl_ccw_attr_group_lpar);
1190 }
1191 if (rc)
1192 return rc;
1193
1194 reipl_block_ccw_init(reipl_block_ccw);
1195 if (ipl_info.type == IPL_TYPE_CCW) {
1196 reipl_block_ccw->ipl_info.ccw.devno = ipl_devno;
1197 reipl_block_ccw_fill_parms(reipl_block_ccw);
1198 }
1199
1200 reipl_capabilities |= IPL_TYPE_CCW;
1201 return 0;
1202}
1203
1204static int __init reipl_fcp_init(void)
1205{
1206 int rc;
1207
1208 if (!diag308_set_works) {
1209 if (ipl_info.type == IPL_TYPE_FCP) {
1210 make_attrs_ro(reipl_fcp_attrs);
1211 sys_reipl_fcp_scp_data_attr.attr.mode = S_IRUGO;
1212 } else
1213 return 0;
1214 }
1215
1216 reipl_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
1217 if (!reipl_block_fcp)
1218 return -ENOMEM;
1219
1220 /* sysfs: create fcp kset for mixing attr group and bin attrs */
1221 reipl_fcp_kset = kset_create_and_add(IPL_FCP_STR, NULL,
1222 &reipl_kset->kobj);
1223 if (!reipl_fcp_kset) {
1224 free_page((unsigned long) reipl_block_fcp);
1225 return -ENOMEM;
1226 }
1227
1228 rc = sysfs_create_group(&reipl_fcp_kset->kobj, &reipl_fcp_attr_group);
1229 if (rc) {
1230 kset_unregister(reipl_fcp_kset);
1231 free_page((unsigned long) reipl_block_fcp);
1232 return rc;
1233 }
1234
1235 rc = sysfs_create_bin_file(&reipl_fcp_kset->kobj,
1236 &sys_reipl_fcp_scp_data_attr);
1237 if (rc) {
1238 sysfs_remove_group(&reipl_fcp_kset->kobj, &reipl_fcp_attr_group);
1239 kset_unregister(reipl_fcp_kset);
1240 free_page((unsigned long) reipl_block_fcp);
1241 return rc;
1242 }
1243
1244 if (ipl_info.type == IPL_TYPE_FCP)
1245 memcpy(reipl_block_fcp, IPL_PARMBLOCK_START, PAGE_SIZE);
1246 else {
1247 reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
1248 reipl_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
1249 reipl_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
1250 reipl_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
1251 reipl_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_IPL;
1252 }
1253 reipl_capabilities |= IPL_TYPE_FCP;
1254 return 0;
1255}
1256
1257static int __init reipl_init(void)
1258{
1259 int rc;
1260
1261 reipl_kset = kset_create_and_add("reipl", NULL, firmware_kobj);
1262 if (!reipl_kset)
1263 return -ENOMEM;
1264 rc = sysfs_create_file(&reipl_kset->kobj, &reipl_type_attr.attr);
1265 if (rc) {
1266 kset_unregister(reipl_kset);
1267 return rc;
1268 }
1269 rc = reipl_ccw_init();
1270 if (rc)
1271 return rc;
1272 rc = reipl_fcp_init();
1273 if (rc)
1274 return rc;
1275 rc = reipl_nss_init();
1276 if (rc)
1277 return rc;
1278 rc = reipl_set_type(ipl_info.type);
1279 if (rc)
1280 return rc;
1281 return 0;
1282}
1283
1284static struct shutdown_action __refdata reipl_action = {
1285 .name = SHUTDOWN_ACTION_REIPL_STR,
1286 .fn = reipl_run,
1287 .init = reipl_init,
1288};
1289
1290/*
1291 * dump shutdown action: Dump Linux on shutdown.
1292 */
1293
1294/* FCP dump device attributes */
1295
1296DEFINE_IPL_ATTR_RW(dump_fcp, wwpn, "0x%016llx\n", "%016llx\n",
1297 dump_block_fcp->ipl_info.fcp.wwpn);
1298DEFINE_IPL_ATTR_RW(dump_fcp, lun, "0x%016llx\n", "%016llx\n",
1299 dump_block_fcp->ipl_info.fcp.lun);
1300DEFINE_IPL_ATTR_RW(dump_fcp, bootprog, "%lld\n", "%lld\n",
1301 dump_block_fcp->ipl_info.fcp.bootprog);
1302DEFINE_IPL_ATTR_RW(dump_fcp, br_lba, "%lld\n", "%lld\n",
1303 dump_block_fcp->ipl_info.fcp.br_lba);
1304DEFINE_IPL_ATTR_RW(dump_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
1305 dump_block_fcp->ipl_info.fcp.devno);
1306
1307static struct attribute *dump_fcp_attrs[] = {
1308 &sys_dump_fcp_device_attr.attr,
1309 &sys_dump_fcp_wwpn_attr.attr,
1310 &sys_dump_fcp_lun_attr.attr,
1311 &sys_dump_fcp_bootprog_attr.attr,
1312 &sys_dump_fcp_br_lba_attr.attr,
1313 NULL,
1314};
1315
1316static struct attribute_group dump_fcp_attr_group = {
1317 .name = IPL_FCP_STR,
1318 .attrs = dump_fcp_attrs,
1319};
1320
1321/* CCW dump device attributes */
1322
1323DEFINE_IPL_ATTR_RW(dump_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
1324 dump_block_ccw->ipl_info.ccw.devno);
1325
1326static struct attribute *dump_ccw_attrs[] = {
1327 &sys_dump_ccw_device_attr.attr,
1328 NULL,
1329};
1330
1331static struct attribute_group dump_ccw_attr_group = {
1332 .name = IPL_CCW_STR,
1333 .attrs = dump_ccw_attrs,
1334};
1335
1336/* dump type */
1337
1338static int dump_set_type(enum dump_type type)
1339{
1340 if (!(dump_capabilities & type))
1341 return -EINVAL;
1342 switch (type) {
1343 case DUMP_TYPE_CCW:
1344 if (diag308_set_works)
1345 dump_method = DUMP_METHOD_CCW_DIAG;
1346 else if (MACHINE_IS_VM)
1347 dump_method = DUMP_METHOD_CCW_VM;
1348 else
1349 dump_method = DUMP_METHOD_CCW_CIO;
1350 break;
1351 case DUMP_TYPE_FCP:
1352 dump_method = DUMP_METHOD_FCP_DIAG;
1353 break;
1354 default:
1355 dump_method = DUMP_METHOD_NONE;
1356 }
1357 dump_type = type;
1358 return 0;
1359}
1360
1361static ssize_t dump_type_show(struct kobject *kobj,
1362 struct kobj_attribute *attr, char *page)
1363{
1364 return sprintf(page, "%s\n", dump_type_str(dump_type));
1365}
1366
1367static ssize_t dump_type_store(struct kobject *kobj,
1368 struct kobj_attribute *attr,
1369 const char *buf, size_t len)
1370{
1371 int rc = -EINVAL;
1372
1373 if (strncmp(buf, DUMP_NONE_STR, strlen(DUMP_NONE_STR)) == 0)
1374 rc = dump_set_type(DUMP_TYPE_NONE);
1375 else if (strncmp(buf, DUMP_CCW_STR, strlen(DUMP_CCW_STR)) == 0)
1376 rc = dump_set_type(DUMP_TYPE_CCW);
1377 else if (strncmp(buf, DUMP_FCP_STR, strlen(DUMP_FCP_STR)) == 0)
1378 rc = dump_set_type(DUMP_TYPE_FCP);
1379 return (rc != 0) ? rc : len;
1380}
1381
1382static struct kobj_attribute dump_type_attr =
1383 __ATTR(dump_type, 0644, dump_type_show, dump_type_store);
1384
1385static struct kset *dump_kset;
1386
1387static void __dump_run(void *unused)
1388{
1389 struct ccw_dev_id devid;
1390 static char buf[100];
1391
1392 switch (dump_method) {
1393 case DUMP_METHOD_CCW_CIO:
1394 devid.devno = dump_block_ccw->ipl_info.ccw.devno;
1395 devid.ssid = 0;
1396 reipl_ccw_dev(&devid);
1397 break;
1398 case DUMP_METHOD_CCW_VM:
1399 sprintf(buf, "STORE STATUS");
1400 __cpcmd(buf, NULL, 0, NULL);
1401 sprintf(buf, "IPL %X", dump_block_ccw->ipl_info.ccw.devno);
1402 __cpcmd(buf, NULL, 0, NULL);
1403 break;
1404 case DUMP_METHOD_CCW_DIAG:
1405 diag308(DIAG308_SET, dump_block_ccw);
1406 diag308(DIAG308_DUMP, NULL);
1407 break;
1408 case DUMP_METHOD_FCP_DIAG:
1409 diag308(DIAG308_SET, dump_block_fcp);
1410 diag308(DIAG308_DUMP, NULL);
1411 break;
1412 default:
1413 break;
1414 }
1415}
1416
1417static void dump_run(struct shutdown_trigger *trigger)
1418{
1419 if (dump_method == DUMP_METHOD_NONE)
1420 return;
1421 smp_send_stop();
1422 smp_switch_to_ipl_cpu(__dump_run, NULL);
1423}
1424
1425static int __init dump_ccw_init(void)
1426{
1427 int rc;
1428
1429 dump_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
1430 if (!dump_block_ccw)
1431 return -ENOMEM;
1432 rc = sysfs_create_group(&dump_kset->kobj, &dump_ccw_attr_group);
1433 if (rc) {
1434 free_page((unsigned long)dump_block_ccw);
1435 return rc;
1436 }
1437 dump_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
1438 dump_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
1439 dump_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
1440 dump_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
1441 dump_capabilities |= DUMP_TYPE_CCW;
1442 return 0;
1443}
1444
1445static int __init dump_fcp_init(void)
1446{
1447 int rc;
1448
1449 if (!sclp_ipl_info.has_dump)
1450 return 0; /* LDIPL DUMP is not installed */
1451 if (!diag308_set_works)
1452 return 0;
1453 dump_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
1454 if (!dump_block_fcp)
1455 return -ENOMEM;
1456 rc = sysfs_create_group(&dump_kset->kobj, &dump_fcp_attr_group);
1457 if (rc) {
1458 free_page((unsigned long)dump_block_fcp);
1459 return rc;
1460 }
1461 dump_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
1462 dump_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
1463 dump_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
1464 dump_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
1465 dump_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_DUMP;
1466 dump_capabilities |= DUMP_TYPE_FCP;
1467 return 0;
1468}
1469
1470static int __init dump_init(void)
1471{
1472 int rc;
1473
1474 dump_kset = kset_create_and_add("dump", NULL, firmware_kobj);
1475 if (!dump_kset)
1476 return -ENOMEM;
1477 rc = sysfs_create_file(&dump_kset->kobj, &dump_type_attr.attr);
1478 if (rc) {
1479 kset_unregister(dump_kset);
1480 return rc;
1481 }
1482 rc = dump_ccw_init();
1483 if (rc)
1484 return rc;
1485 rc = dump_fcp_init();
1486 if (rc)
1487 return rc;
1488 dump_set_type(DUMP_TYPE_NONE);
1489 return 0;
1490}
1491
1492static struct shutdown_action __refdata dump_action = {
1493 .name = SHUTDOWN_ACTION_DUMP_STR,
1494 .fn = dump_run,
1495 .init = dump_init,
1496};
1497
1498static void dump_reipl_run(struct shutdown_trigger *trigger)
1499{
1500 preempt_disable();
1501 /*
1502 * Bypass dynamic address translation (DAT) when storing IPL parameter
1503 * information block address and checksum into the prefix area
1504 * (corresponding to absolute addresses 0-8191).
1505 * When enhanced DAT applies and the STE format control in one,
1506 * the absolute address is formed without prefixing. In this case a
1507 * normal store (stg/st) into the prefix area would no more match to
1508 * absolute addresses 0-8191.
1509 */
1510#ifdef CONFIG_64BIT
1511 asm volatile("sturg %0,%1"
1512 :: "a" ((unsigned long) reipl_block_actual),
1513 "a" (&lowcore_ptr[smp_processor_id()]->ipib));
1514#else
1515 asm volatile("stura %0,%1"
1516 :: "a" ((unsigned long) reipl_block_actual),
1517 "a" (&lowcore_ptr[smp_processor_id()]->ipib));
1518#endif
1519 asm volatile("stura %0,%1"
1520 :: "a" (csum_partial(reipl_block_actual,
1521 reipl_block_actual->hdr.len, 0)),
1522 "a" (&lowcore_ptr[smp_processor_id()]->ipib_checksum));
1523 preempt_enable();
1524 dump_run(trigger);
1525}
1526
1527static int __init dump_reipl_init(void)
1528{
1529 if (!diag308_set_works)
1530 return -EOPNOTSUPP;
1531 else
1532 return 0;
1533}
1534
1535static struct shutdown_action __refdata dump_reipl_action = {
1536 .name = SHUTDOWN_ACTION_DUMP_REIPL_STR,
1537 .fn = dump_reipl_run,
1538 .init = dump_reipl_init,
1539};
1540
1541/*
1542 * vmcmd shutdown action: Trigger vm command on shutdown.
1543 */
1544
1545static char vmcmd_on_reboot[128];
1546static char vmcmd_on_panic[128];
1547static char vmcmd_on_halt[128];
1548static char vmcmd_on_poff[128];
1549static char vmcmd_on_restart[128];
1550
1551DEFINE_IPL_ATTR_STR_RW(vmcmd, on_reboot, "%s\n", "%s\n", vmcmd_on_reboot);
1552DEFINE_IPL_ATTR_STR_RW(vmcmd, on_panic, "%s\n", "%s\n", vmcmd_on_panic);
1553DEFINE_IPL_ATTR_STR_RW(vmcmd, on_halt, "%s\n", "%s\n", vmcmd_on_halt);
1554DEFINE_IPL_ATTR_STR_RW(vmcmd, on_poff, "%s\n", "%s\n", vmcmd_on_poff);
1555DEFINE_IPL_ATTR_STR_RW(vmcmd, on_restart, "%s\n", "%s\n", vmcmd_on_restart);
1556
1557static struct attribute *vmcmd_attrs[] = {
1558 &sys_vmcmd_on_reboot_attr.attr,
1559 &sys_vmcmd_on_panic_attr.attr,
1560 &sys_vmcmd_on_halt_attr.attr,
1561 &sys_vmcmd_on_poff_attr.attr,
1562 &sys_vmcmd_on_restart_attr.attr,
1563 NULL,
1564};
1565
1566static struct attribute_group vmcmd_attr_group = {
1567 .attrs = vmcmd_attrs,
1568};
1569
1570static struct kset *vmcmd_kset;
1571
1572static void vmcmd_run(struct shutdown_trigger *trigger)
1573{
1574 char *cmd, *next_cmd;
1575
1576 if (strcmp(trigger->name, ON_REIPL_STR) == 0)
1577 cmd = vmcmd_on_reboot;
1578 else if (strcmp(trigger->name, ON_PANIC_STR) == 0)
1579 cmd = vmcmd_on_panic;
1580 else if (strcmp(trigger->name, ON_HALT_STR) == 0)
1581 cmd = vmcmd_on_halt;
1582 else if (strcmp(trigger->name, ON_POFF_STR) == 0)
1583 cmd = vmcmd_on_poff;
1584 else if (strcmp(trigger->name, ON_RESTART_STR) == 0)
1585 cmd = vmcmd_on_restart;
1586 else
1587 return;
1588
1589 if (strlen(cmd) == 0)
1590 return;
1591 do {
1592 next_cmd = strchr(cmd, '\n');
1593 if (next_cmd) {
1594 next_cmd[0] = 0;
1595 next_cmd += 1;
1596 }
1597 __cpcmd(cmd, NULL, 0, NULL);
1598 cmd = next_cmd;
1599 } while (cmd != NULL);
1600}
1601
1602static int vmcmd_init(void)
1603{
1604 if (!MACHINE_IS_VM)
1605 return -EOPNOTSUPP;
1606 vmcmd_kset = kset_create_and_add("vmcmd", NULL, firmware_kobj);
1607 if (!vmcmd_kset)
1608 return -ENOMEM;
1609 return sysfs_create_group(&vmcmd_kset->kobj, &vmcmd_attr_group);
1610}
1611
1612static struct shutdown_action vmcmd_action = {SHUTDOWN_ACTION_VMCMD_STR,
1613 vmcmd_run, vmcmd_init};
1614
1615/*
1616 * stop shutdown action: Stop Linux on shutdown.
1617 */
1618
1619static void stop_run(struct shutdown_trigger *trigger)
1620{
1621 if (strcmp(trigger->name, ON_PANIC_STR) == 0 ||
1622 strcmp(trigger->name, ON_RESTART_STR) == 0)
1623 disabled_wait((unsigned long) __builtin_return_address(0));
1624 while (sigp(smp_processor_id(), sigp_stop) == sigp_busy)
1625 cpu_relax();
1626 for (;;);
1627}
1628
1629static struct shutdown_action stop_action = {SHUTDOWN_ACTION_STOP_STR,
1630 stop_run, NULL};
1631
1632/* action list */
1633
1634static struct shutdown_action *shutdown_actions_list[] = {
1635 &ipl_action, &reipl_action, &dump_reipl_action, &dump_action,
1636 &vmcmd_action, &stop_action};
1637#define SHUTDOWN_ACTIONS_COUNT (sizeof(shutdown_actions_list) / sizeof(void *))
1638
1639/*
1640 * Trigger section
1641 */
1642
1643static struct kset *shutdown_actions_kset;
1644
1645static int set_trigger(const char *buf, struct shutdown_trigger *trigger,
1646 size_t len)
1647{
1648 int i;
1649
1650 for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
1651 if (sysfs_streq(buf, shutdown_actions_list[i]->name)) {
1652 if (shutdown_actions_list[i]->init_rc) {
1653 return shutdown_actions_list[i]->init_rc;
1654 } else {
1655 trigger->action = shutdown_actions_list[i];
1656 return len;
1657 }
1658 }
1659 }
1660 return -EINVAL;
1661}
1662
1663/* on reipl */
1664
1665static struct shutdown_trigger on_reboot_trigger = {ON_REIPL_STR,
1666 &reipl_action};
1667
1668static ssize_t on_reboot_show(struct kobject *kobj,
1669 struct kobj_attribute *attr, char *page)
1670{
1671 return sprintf(page, "%s\n", on_reboot_trigger.action->name);
1672}
1673
1674static ssize_t on_reboot_store(struct kobject *kobj,
1675 struct kobj_attribute *attr,
1676 const char *buf, size_t len)
1677{
1678 return set_trigger(buf, &on_reboot_trigger, len);
1679}
1680
1681static struct kobj_attribute on_reboot_attr =
1682 __ATTR(on_reboot, 0644, on_reboot_show, on_reboot_store);
1683
1684static void do_machine_restart(char *__unused)
1685{
1686 smp_send_stop();
1687 on_reboot_trigger.action->fn(&on_reboot_trigger);
1688 reipl_run(NULL);
1689}
1690void (*_machine_restart)(char *command) = do_machine_restart;
1691
1692/* on panic */
1693
1694static struct shutdown_trigger on_panic_trigger = {ON_PANIC_STR, &stop_action};
1695
1696static ssize_t on_panic_show(struct kobject *kobj,
1697 struct kobj_attribute *attr, char *page)
1698{
1699 return sprintf(page, "%s\n", on_panic_trigger.action->name);
1700}
1701
1702static ssize_t on_panic_store(struct kobject *kobj,
1703 struct kobj_attribute *attr,
1704 const char *buf, size_t len)
1705{
1706 return set_trigger(buf, &on_panic_trigger, len);
1707}
1708
1709static struct kobj_attribute on_panic_attr =
1710 __ATTR(on_panic, 0644, on_panic_show, on_panic_store);
1711
1712static void do_panic(void)
1713{
1714 on_panic_trigger.action->fn(&on_panic_trigger);
1715 stop_run(&on_panic_trigger);
1716}
1717
1718/* on restart */
1719
1720static struct shutdown_trigger on_restart_trigger = {ON_RESTART_STR,
1721 &stop_action};
1722
1723static ssize_t on_restart_show(struct kobject *kobj,
1724 struct kobj_attribute *attr, char *page)
1725{
1726 return sprintf(page, "%s\n", on_restart_trigger.action->name);
1727}
1728
1729static ssize_t on_restart_store(struct kobject *kobj,
1730 struct kobj_attribute *attr,
1731 const char *buf, size_t len)
1732{
1733 return set_trigger(buf, &on_restart_trigger, len);
1734}
1735
1736static struct kobj_attribute on_restart_attr =
1737 __ATTR(on_restart, 0644, on_restart_show, on_restart_store);
1738
1739void do_restart(void)
1740{
1741 smp_send_stop();
1742 on_restart_trigger.action->fn(&on_restart_trigger);
1743 stop_run(&on_restart_trigger);
1744}
1745
1746/* on halt */
1747
1748static struct shutdown_trigger on_halt_trigger = {ON_HALT_STR, &stop_action};
1749
1750static ssize_t on_halt_show(struct kobject *kobj,
1751 struct kobj_attribute *attr, char *page)
1752{
1753 return sprintf(page, "%s\n", on_halt_trigger.action->name);
1754}
1755
1756static ssize_t on_halt_store(struct kobject *kobj,
1757 struct kobj_attribute *attr,
1758 const char *buf, size_t len)
1759{
1760 return set_trigger(buf, &on_halt_trigger, len);
1761}
1762
1763static struct kobj_attribute on_halt_attr =
1764 __ATTR(on_halt, 0644, on_halt_show, on_halt_store);
1765
1766
1767static void do_machine_halt(void)
1768{
1769 smp_send_stop();
1770 on_halt_trigger.action->fn(&on_halt_trigger);
1771 stop_run(&on_halt_trigger);
1772}
1773void (*_machine_halt)(void) = do_machine_halt;
1774
1775/* on power off */
1776
1777static struct shutdown_trigger on_poff_trigger = {ON_POFF_STR, &stop_action};
1778
1779static ssize_t on_poff_show(struct kobject *kobj,
1780 struct kobj_attribute *attr, char *page)
1781{
1782 return sprintf(page, "%s\n", on_poff_trigger.action->name);
1783}
1784
1785static ssize_t on_poff_store(struct kobject *kobj,
1786 struct kobj_attribute *attr,
1787 const char *buf, size_t len)
1788{
1789 return set_trigger(buf, &on_poff_trigger, len);
1790}
1791
1792static struct kobj_attribute on_poff_attr =
1793 __ATTR(on_poff, 0644, on_poff_show, on_poff_store);
1794
1795
1796static void do_machine_power_off(void)
1797{
1798 smp_send_stop();
1799 on_poff_trigger.action->fn(&on_poff_trigger);
1800 stop_run(&on_poff_trigger);
1801}
1802void (*_machine_power_off)(void) = do_machine_power_off;
1803
1804static void __init shutdown_triggers_init(void)
1805{
1806 shutdown_actions_kset = kset_create_and_add("shutdown_actions", NULL,
1807 firmware_kobj);
1808 if (!shutdown_actions_kset)
1809 goto fail;
1810 if (sysfs_create_file(&shutdown_actions_kset->kobj,
1811 &on_reboot_attr.attr))
1812 goto fail;
1813 if (sysfs_create_file(&shutdown_actions_kset->kobj,
1814 &on_panic_attr.attr))
1815 goto fail;
1816 if (sysfs_create_file(&shutdown_actions_kset->kobj,
1817 &on_halt_attr.attr))
1818 goto fail;
1819 if (sysfs_create_file(&shutdown_actions_kset->kobj,
1820 &on_poff_attr.attr))
1821 goto fail;
1822 if (sysfs_create_file(&shutdown_actions_kset->kobj,
1823 &on_restart_attr.attr))
1824 goto fail;
1825 return;
1826fail:
1827 panic("shutdown_triggers_init failed\n");
1828}
1829
1830static void __init shutdown_actions_init(void)
1831{
1832 int i;
1833
1834 for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
1835 if (!shutdown_actions_list[i]->init)
1836 continue;
1837 shutdown_actions_list[i]->init_rc =
1838 shutdown_actions_list[i]->init();
1839 }
1840}
1841
1842static int __init s390_ipl_init(void)
1843{
1844 sclp_get_ipl_info(&sclp_ipl_info);
1845 shutdown_actions_init();
1846 shutdown_triggers_init();
1847 return 0;
1848}
1849
1850__initcall(s390_ipl_init);
1851
1852static void __init strncpy_skip_quote(char *dst, char *src, int n)
1853{
1854 int sx, dx;
1855
1856 dx = 0;
1857 for (sx = 0; src[sx] != 0; sx++) {
1858 if (src[sx] == '"')
1859 continue;
1860 dst[dx++] = src[sx];
1861 if (dx >= n)
1862 break;
1863 }
1864}
1865
1866static int __init vmcmd_on_reboot_setup(char *str)
1867{
1868 if (!MACHINE_IS_VM)
1869 return 1;
1870 strncpy_skip_quote(vmcmd_on_reboot, str, 127);
1871 vmcmd_on_reboot[127] = 0;
1872 on_reboot_trigger.action = &vmcmd_action;
1873 return 1;
1874}
1875__setup("vmreboot=", vmcmd_on_reboot_setup);
1876
1877static int __init vmcmd_on_panic_setup(char *str)
1878{
1879 if (!MACHINE_IS_VM)
1880 return 1;
1881 strncpy_skip_quote(vmcmd_on_panic, str, 127);
1882 vmcmd_on_panic[127] = 0;
1883 on_panic_trigger.action = &vmcmd_action;
1884 return 1;
1885}
1886__setup("vmpanic=", vmcmd_on_panic_setup);
1887
1888static int __init vmcmd_on_halt_setup(char *str)
1889{
1890 if (!MACHINE_IS_VM)
1891 return 1;
1892 strncpy_skip_quote(vmcmd_on_halt, str, 127);
1893 vmcmd_on_halt[127] = 0;
1894 on_halt_trigger.action = &vmcmd_action;
1895 return 1;
1896}
1897__setup("vmhalt=", vmcmd_on_halt_setup);
1898
1899static int __init vmcmd_on_poff_setup(char *str)
1900{
1901 if (!MACHINE_IS_VM)
1902 return 1;
1903 strncpy_skip_quote(vmcmd_on_poff, str, 127);
1904 vmcmd_on_poff[127] = 0;
1905 on_poff_trigger.action = &vmcmd_action;
1906 return 1;
1907}
1908__setup("vmpoff=", vmcmd_on_poff_setup);
1909
1910static int on_panic_notify(struct notifier_block *self,
1911 unsigned long event, void *data)
1912{
1913 do_panic();
1914 return NOTIFY_OK;
1915}
1916
1917static struct notifier_block on_panic_nb = {
1918 .notifier_call = on_panic_notify,
1919 .priority = INT_MIN,
1920};
1921
1922void __init setup_ipl(void)
1923{
1924 ipl_info.type = get_ipl_type();
1925 switch (ipl_info.type) {
1926 case IPL_TYPE_CCW:
1927 ipl_info.data.ccw.dev_id.devno = ipl_devno;
1928 ipl_info.data.ccw.dev_id.ssid = 0;
1929 break;
1930 case IPL_TYPE_FCP:
1931 case IPL_TYPE_FCP_DUMP:
1932 ipl_info.data.fcp.dev_id.devno =
1933 IPL_PARMBLOCK_START->ipl_info.fcp.devno;
1934 ipl_info.data.fcp.dev_id.ssid = 0;
1935 ipl_info.data.fcp.wwpn = IPL_PARMBLOCK_START->ipl_info.fcp.wwpn;
1936 ipl_info.data.fcp.lun = IPL_PARMBLOCK_START->ipl_info.fcp.lun;
1937 break;
1938 case IPL_TYPE_NSS:
1939 strncpy(ipl_info.data.nss.name, kernel_nss_name,
1940 sizeof(ipl_info.data.nss.name));
1941 break;
1942 case IPL_TYPE_UNKNOWN:
1943 /* We have no info to copy */
1944 break;
1945 }
1946 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
1947}
1948
1949void __init ipl_update_parameters(void)
1950{
1951 int rc;
1952
1953 rc = diag308(DIAG308_STORE, &ipl_block);
1954 if ((rc == DIAG308_RC_OK) || (rc == DIAG308_RC_NOCONFIG))
1955 diag308_set_works = 1;
1956}
1957
1958void __init ipl_save_parameters(void)
1959{
1960 struct cio_iplinfo iplinfo;
1961 void *src, *dst;
1962
1963 if (cio_get_iplinfo(&iplinfo))
1964 return;
1965
1966 ipl_devno = iplinfo.devno;
1967 ipl_flags |= IPL_DEVNO_VALID;
1968 if (!iplinfo.is_qdio)
1969 return;
1970 ipl_flags |= IPL_PARMBLOCK_VALID;
1971 src = (void *)(unsigned long)S390_lowcore.ipl_parmblock_ptr;
1972 dst = (void *)IPL_PARMBLOCK_ORIGIN;
1973 memmove(dst, src, PAGE_SIZE);
1974 S390_lowcore.ipl_parmblock_ptr = IPL_PARMBLOCK_ORIGIN;
1975}
1976
1977static LIST_HEAD(rcall);
1978static DEFINE_MUTEX(rcall_mutex);
1979
1980void register_reset_call(struct reset_call *reset)
1981{
1982 mutex_lock(&rcall_mutex);
1983 list_add(&reset->list, &rcall);
1984 mutex_unlock(&rcall_mutex);
1985}
1986EXPORT_SYMBOL_GPL(register_reset_call);
1987
1988void unregister_reset_call(struct reset_call *reset)
1989{
1990 mutex_lock(&rcall_mutex);
1991 list_del(&reset->list);
1992 mutex_unlock(&rcall_mutex);
1993}
1994EXPORT_SYMBOL_GPL(unregister_reset_call);
1995
1996static void do_reset_calls(void)
1997{
1998 struct reset_call *reset;
1999
2000#ifdef CONFIG_64BIT
2001 if (diag308_set_works) {
2002 diag308_reset();
2003 return;
2004 }
2005#endif
2006 list_for_each_entry(reset, &rcall, list)
2007 reset->fn();
2008}
2009
2010u32 dump_prefix_page;
2011
2012void s390_reset_system(void)
2013{
2014 struct _lowcore *lc;
2015
2016 lc = (struct _lowcore *)(unsigned long) store_prefix();
2017
2018 /* Stack for interrupt/machine check handler */
2019 lc->panic_stack = S390_lowcore.panic_stack;
2020
2021 /* Save prefix page address for dump case */
2022 dump_prefix_page = (u32)(unsigned long) lc;
2023
2024 /* Disable prefixing */
2025 set_prefix(0);
2026
2027 /* Disable lowcore protection */
2028 __ctl_clear_bit(0,28);
2029
2030 /* Set new machine check handler */
2031 S390_lowcore.mcck_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
2032 S390_lowcore.mcck_new_psw.addr =
2033 PSW_ADDR_AMODE | (unsigned long) s390_base_mcck_handler;
2034
2035 /* Set new program check handler */
2036 S390_lowcore.program_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
2037 S390_lowcore.program_new_psw.addr =
2038 PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
2039
2040 do_reset_calls();
2041}
2042