ipl.c 26.0 KB
Newer Older
M
Michael Holzheu 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
/*
 *  arch/s390/kernel/ipl.c
 *    ipl/reipl/dump support for Linux on s390.
 *
 *    Copyright (C) IBM Corp. 2005,2006
 *    Author(s): Michael Holzheu <holzheu@de.ibm.com>
 *		 Heiko Carstens <heiko.carstens@de.ibm.com>
 *		 Volker Sameske <sameske@de.ibm.com>
 */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/reboot.h>
16
#include <linux/ctype.h>
M
Michael Holzheu 已提交
17 18 19 20
#include <asm/smp.h>
#include <asm/setup.h>
#include <asm/cpcmd.h>
#include <asm/cio.h>
21
#include <asm/ebcdic.h>
22
#include <asm/reset.h>
M
Michael Holzheu 已提交
23 24

#define IPL_PARM_BLOCK_VERSION 0
25 26 27 28 29 30
#define LOADPARM_LEN 8

extern char s390_readinfo_sccb[];
#define SCCB_VALID (*((__u16*)&s390_readinfo_sccb[6]) == 0x0010)
#define SCCB_LOADPARM (&s390_readinfo_sccb[24])
#define SCCB_FLAG (s390_readinfo_sccb[91])
M
Michael Holzheu 已提交
31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131

enum ipl_type {
	IPL_TYPE_NONE	 = 1,
	IPL_TYPE_UNKNOWN = 2,
	IPL_TYPE_CCW	 = 4,
	IPL_TYPE_FCP	 = 8,
};

#define IPL_NONE_STR	 "none"
#define IPL_UNKNOWN_STR  "unknown"
#define IPL_CCW_STR	 "ccw"
#define IPL_FCP_STR	 "fcp"

static char *ipl_type_str(enum ipl_type type)
{
	switch (type) {
	case IPL_TYPE_NONE:
		return IPL_NONE_STR;
	case IPL_TYPE_CCW:
		return IPL_CCW_STR;
	case IPL_TYPE_FCP:
		return IPL_FCP_STR;
	case IPL_TYPE_UNKNOWN:
	default:
		return IPL_UNKNOWN_STR;
	}
}

enum ipl_method {
	IPL_METHOD_NONE,
	IPL_METHOD_CCW_CIO,
	IPL_METHOD_CCW_DIAG,
	IPL_METHOD_CCW_VM,
	IPL_METHOD_FCP_RO_DIAG,
	IPL_METHOD_FCP_RW_DIAG,
	IPL_METHOD_FCP_RO_VM,
};

enum shutdown_action {
	SHUTDOWN_REIPL,
	SHUTDOWN_DUMP,
	SHUTDOWN_STOP,
};

#define SHUTDOWN_REIPL_STR "reipl"
#define SHUTDOWN_DUMP_STR  "dump"
#define SHUTDOWN_STOP_STR  "stop"

static char *shutdown_action_str(enum shutdown_action action)
{
	switch (action) {
	case SHUTDOWN_REIPL:
		return SHUTDOWN_REIPL_STR;
	case SHUTDOWN_DUMP:
		return SHUTDOWN_DUMP_STR;
	case SHUTDOWN_STOP:
		return SHUTDOWN_STOP_STR;
	default:
		BUG();
	}
}

enum diag308_subcode  {
	DIAG308_IPL   = 3,
	DIAG308_DUMP  = 4,
	DIAG308_SET   = 5,
	DIAG308_STORE = 6,
};

enum diag308_ipl_type {
	DIAG308_IPL_TYPE_FCP = 0,
	DIAG308_IPL_TYPE_CCW = 2,
};

enum diag308_opt {
	DIAG308_IPL_OPT_IPL  = 0x10,
	DIAG308_IPL_OPT_DUMP = 0x20,
};

enum diag308_rc {
	DIAG308_RC_OK = 1,
};

static int diag308_set_works = 0;

static int reipl_capabilities = IPL_TYPE_UNKNOWN;
static enum ipl_type reipl_type = IPL_TYPE_UNKNOWN;
static enum ipl_method reipl_method = IPL_METHOD_NONE;
static struct ipl_parameter_block *reipl_block_fcp;
static struct ipl_parameter_block *reipl_block_ccw;

static int dump_capabilities = IPL_TYPE_NONE;
static enum ipl_type dump_type = IPL_TYPE_NONE;
static enum ipl_method dump_method = IPL_METHOD_NONE;
static struct ipl_parameter_block *dump_block_fcp;
static struct ipl_parameter_block *dump_block_ccw;

static enum shutdown_action on_panic_action = SHUTDOWN_STOP;

static int diag308(unsigned long subcode, void *addr)
{
132
	register unsigned long _addr asm("0") = (unsigned long) addr;
M
Michael Holzheu 已提交
133 134
	register unsigned long _rc asm("1") = 0;

135 136 137 138
	asm volatile(
		"	diag	%0,%2,0x308\n"
		"0:\n"
		EX_TABLE(0b,0b)
M
Michael Holzheu 已提交
139
		: "+d" (_addr), "+d" (_rc)
140
		: "d" (subcode) : "cc", "memory");
M
Michael Holzheu 已提交
141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191
	return _rc;
}

/* SYSFS */

#define DEFINE_IPL_ATTR_RO(_prefix, _name, _format, _value)		\
static ssize_t sys_##_prefix##_##_name##_show(struct subsystem *subsys,	\
		char *page)						\
{									\
	return sprintf(page, _format, _value);				\
}									\
static struct subsys_attribute sys_##_prefix##_##_name##_attr =		\
	__ATTR(_name, S_IRUGO, sys_##_prefix##_##_name##_show, NULL);

#define DEFINE_IPL_ATTR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)	\
static ssize_t sys_##_prefix##_##_name##_show(struct subsystem *subsys,	\
		char *page)						\
{									\
	return sprintf(page, _fmt_out,					\
			(unsigned long long) _value);			\
}									\
static ssize_t sys_##_prefix##_##_name##_store(struct subsystem *subsys,\
		const char *buf, size_t len)				\
{									\
	unsigned long long value;					\
	if (sscanf(buf, _fmt_in, &value) != 1)				\
		return -EINVAL;						\
	_value = value;							\
	return len;							\
}									\
static struct subsys_attribute sys_##_prefix##_##_name##_attr =		\
	__ATTR(_name,(S_IRUGO | S_IWUSR),				\
			sys_##_prefix##_##_name##_show,			\
			sys_##_prefix##_##_name##_store);

static void make_attrs_ro(struct attribute **attrs)
{
	while (*attrs) {
		(*attrs)->mode = S_IRUGO;
		attrs++;
	}
}

/*
 * ipl section
 */

static enum ipl_type ipl_get_type(void)
{
	struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;

192
	if (!(ipl_flags & IPL_DEVNO_VALID))
M
Michael Holzheu 已提交
193
		return IPL_TYPE_UNKNOWN;
194
	if (!(ipl_flags & IPL_PARMBLOCK_VALID))
M
Michael Holzheu 已提交
195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300
		return IPL_TYPE_CCW;
	if (ipl->hdr.version > IPL_MAX_SUPPORTED_VERSION)
		return IPL_TYPE_UNKNOWN;
	if (ipl->hdr.pbt != DIAG308_IPL_TYPE_FCP)
		return IPL_TYPE_UNKNOWN;
	return IPL_TYPE_FCP;
}

static ssize_t ipl_type_show(struct subsystem *subsys, char *page)
{
	return sprintf(page, "%s\n", ipl_type_str(ipl_get_type()));
}

static struct subsys_attribute sys_ipl_type_attr = __ATTR_RO(ipl_type);

static ssize_t sys_ipl_device_show(struct subsystem *subsys, char *page)
{
	struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;

	switch (ipl_get_type()) {
	case IPL_TYPE_CCW:
		return sprintf(page, "0.0.%04x\n", ipl_devno);
	case IPL_TYPE_FCP:
		return sprintf(page, "0.0.%04x\n", ipl->ipl_info.fcp.devno);
	default:
		return 0;
	}
}

static struct subsys_attribute sys_ipl_device_attr =
	__ATTR(device, S_IRUGO, sys_ipl_device_show, NULL);

static ssize_t ipl_parameter_read(struct kobject *kobj, char *buf, loff_t off,
				  size_t count)
{
	unsigned int size = IPL_PARMBLOCK_SIZE;

	if (off > size)
		return 0;
	if (off + count > size)
		count = size - off;
	memcpy(buf, (void *)IPL_PARMBLOCK_START + off, count);
	return count;
}

static struct bin_attribute ipl_parameter_attr = {
	.attr = {
		.name = "binary_parameter",
		.mode = S_IRUGO,
		.owner = THIS_MODULE,
	},
	.size = PAGE_SIZE,
	.read = &ipl_parameter_read,
};

static ssize_t ipl_scp_data_read(struct kobject *kobj, char *buf, loff_t off,
	size_t count)
{
	unsigned int size = IPL_PARMBLOCK_START->ipl_info.fcp.scp_data_len;
	void *scp_data = &IPL_PARMBLOCK_START->ipl_info.fcp.scp_data;

	if (off > size)
		return 0;
	if (off + count > size)
		count = size - off;
	memcpy(buf, scp_data + off, count);
	return count;
}

static struct bin_attribute ipl_scp_data_attr = {
	.attr = {
		.name = "scp_data",
		.mode = S_IRUGO,
		.owner = THIS_MODULE,
	},
	.size = PAGE_SIZE,
	.read = &ipl_scp_data_read,
};

/* FCP ipl device attributes */

DEFINE_IPL_ATTR_RO(ipl_fcp, wwpn, "0x%016llx\n", (unsigned long long)
		   IPL_PARMBLOCK_START->ipl_info.fcp.wwpn);
DEFINE_IPL_ATTR_RO(ipl_fcp, lun, "0x%016llx\n", (unsigned long long)
		   IPL_PARMBLOCK_START->ipl_info.fcp.lun);
DEFINE_IPL_ATTR_RO(ipl_fcp, bootprog, "%lld\n", (unsigned long long)
		   IPL_PARMBLOCK_START->ipl_info.fcp.bootprog);
DEFINE_IPL_ATTR_RO(ipl_fcp, br_lba, "%lld\n", (unsigned long long)
		   IPL_PARMBLOCK_START->ipl_info.fcp.br_lba);

static struct attribute *ipl_fcp_attrs[] = {
	&sys_ipl_type_attr.attr,
	&sys_ipl_device_attr.attr,
	&sys_ipl_fcp_wwpn_attr.attr,
	&sys_ipl_fcp_lun_attr.attr,
	&sys_ipl_fcp_bootprog_attr.attr,
	&sys_ipl_fcp_br_lba_attr.attr,
	NULL,
};

static struct attribute_group ipl_fcp_attr_group = {
	.attrs = ipl_fcp_attrs,
};

/* CCW ipl device attributes */

301 302 303 304 305 306 307 308 309 310 311 312 313 314 315
static ssize_t ipl_ccw_loadparm_show(struct subsystem *subsys, char *page)
{
	char loadparm[LOADPARM_LEN + 1] = {};

	if (!SCCB_VALID)
		return sprintf(page, "#unknown#\n");
	memcpy(loadparm, SCCB_LOADPARM, LOADPARM_LEN);
	EBCASC(loadparm, LOADPARM_LEN);
	strstrip(loadparm);
	return sprintf(page, "%s\n", loadparm);
}

static struct subsys_attribute sys_ipl_ccw_loadparm_attr =
	__ATTR(loadparm, 0444, ipl_ccw_loadparm_show, NULL);

M
Michael Holzheu 已提交
316 317 318
static struct attribute *ipl_ccw_attrs[] = {
	&sys_ipl_type_attr.attr,
	&sys_ipl_device_attr.attr,
319
	&sys_ipl_ccw_loadparm_attr.attr,
M
Michael Holzheu 已提交
320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375
	NULL,
};

static struct attribute_group ipl_ccw_attr_group = {
	.attrs = ipl_ccw_attrs,
};

/* UNKNOWN ipl device attributes */

static struct attribute *ipl_unknown_attrs[] = {
	&sys_ipl_type_attr.attr,
	NULL,
};

static struct attribute_group ipl_unknown_attr_group = {
	.attrs = ipl_unknown_attrs,
};

static decl_subsys(ipl, NULL, NULL);

/*
 * reipl section
 */

/* FCP reipl device attributes */

DEFINE_IPL_ATTR_RW(reipl_fcp, wwpn, "0x%016llx\n", "%016llx\n",
		   reipl_block_fcp->ipl_info.fcp.wwpn);
DEFINE_IPL_ATTR_RW(reipl_fcp, lun, "0x%016llx\n", "%016llx\n",
		   reipl_block_fcp->ipl_info.fcp.lun);
DEFINE_IPL_ATTR_RW(reipl_fcp, bootprog, "%lld\n", "%lld\n",
		   reipl_block_fcp->ipl_info.fcp.bootprog);
DEFINE_IPL_ATTR_RW(reipl_fcp, br_lba, "%lld\n", "%lld\n",
		   reipl_block_fcp->ipl_info.fcp.br_lba);
DEFINE_IPL_ATTR_RW(reipl_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
		   reipl_block_fcp->ipl_info.fcp.devno);

static struct attribute *reipl_fcp_attrs[] = {
	&sys_reipl_fcp_device_attr.attr,
	&sys_reipl_fcp_wwpn_attr.attr,
	&sys_reipl_fcp_lun_attr.attr,
	&sys_reipl_fcp_bootprog_attr.attr,
	&sys_reipl_fcp_br_lba_attr.attr,
	NULL,
};

static struct attribute_group reipl_fcp_attr_group = {
	.name  = IPL_FCP_STR,
	.attrs = reipl_fcp_attrs,
};

/* CCW reipl device attributes */

DEFINE_IPL_ATTR_RW(reipl_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
	reipl_block_ccw->ipl_info.ccw.devno);

376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423
static void reipl_get_ascii_loadparm(char *loadparm)
{
	memcpy(loadparm, &reipl_block_ccw->ipl_info.ccw.load_param,
	       LOADPARM_LEN);
	EBCASC(loadparm, LOADPARM_LEN);
	loadparm[LOADPARM_LEN] = 0;
	strstrip(loadparm);
}

static ssize_t reipl_ccw_loadparm_show(struct subsystem *subsys, char *page)
{
	char buf[LOADPARM_LEN + 1];

	reipl_get_ascii_loadparm(buf);
	return sprintf(page, "%s\n", buf);
}

static ssize_t reipl_ccw_loadparm_store(struct subsystem *subsys,
					const char *buf, size_t len)
{
	int i, lp_len;

	/* ignore trailing newline */
	lp_len = len;
	if ((len > 0) && (buf[len - 1] == '\n'))
		lp_len--;
	/* loadparm can have max 8 characters and must not start with a blank */
	if ((lp_len > LOADPARM_LEN) || ((lp_len > 0) && (buf[0] == ' ')))
		return -EINVAL;
	/* loadparm can only contain "a-z,A-Z,0-9,SP,." */
	for (i = 0; i < lp_len; i++) {
		if (isalpha(buf[i]) || isdigit(buf[i]) || (buf[i] == ' ') ||
		    (buf[i] == '.'))
			continue;
		return -EINVAL;
	}
	/* initialize loadparm with blanks */
	memset(&reipl_block_ccw->ipl_info.ccw.load_param, ' ', LOADPARM_LEN);
	/* copy and convert to ebcdic */
	memcpy(&reipl_block_ccw->ipl_info.ccw.load_param, buf, lp_len);
	ASCEBC(reipl_block_ccw->ipl_info.ccw.load_param, LOADPARM_LEN);
	return len;
}

static struct subsys_attribute sys_reipl_ccw_loadparm_attr =
	__ATTR(loadparm, 0644, reipl_ccw_loadparm_show,
	       reipl_ccw_loadparm_store);

M
Michael Holzheu 已提交
424 425
static struct attribute *reipl_ccw_attrs[] = {
	&sys_reipl_ccw_device_attr.attr,
426
	&sys_reipl_ccw_loadparm_attr.attr,
M
Michael Holzheu 已提交
427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647
	NULL,
};

static struct attribute_group reipl_ccw_attr_group = {
	.name  = IPL_CCW_STR,
	.attrs = reipl_ccw_attrs,
};

/* reipl type */

static int reipl_set_type(enum ipl_type type)
{
	if (!(reipl_capabilities & type))
		return -EINVAL;

	switch(type) {
	case IPL_TYPE_CCW:
		if (MACHINE_IS_VM)
			reipl_method = IPL_METHOD_CCW_VM;
		else
			reipl_method = IPL_METHOD_CCW_CIO;
		break;
	case IPL_TYPE_FCP:
		if (diag308_set_works)
			reipl_method = IPL_METHOD_FCP_RW_DIAG;
		else if (MACHINE_IS_VM)
			reipl_method = IPL_METHOD_FCP_RO_VM;
		else
			reipl_method = IPL_METHOD_FCP_RO_DIAG;
		break;
	default:
		reipl_method = IPL_METHOD_NONE;
	}
	reipl_type = type;
	return 0;
}

static ssize_t reipl_type_show(struct subsystem *subsys, char *page)
{
	return sprintf(page, "%s\n", ipl_type_str(reipl_type));
}

static ssize_t reipl_type_store(struct subsystem *subsys, const char *buf,
				size_t len)
{
	int rc = -EINVAL;

	if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
		rc = reipl_set_type(IPL_TYPE_CCW);
	else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
		rc = reipl_set_type(IPL_TYPE_FCP);
	return (rc != 0) ? rc : len;
}

static struct subsys_attribute reipl_type_attr =
		__ATTR(reipl_type, 0644, reipl_type_show, reipl_type_store);

static decl_subsys(reipl, NULL, NULL);

/*
 * dump section
 */

/* FCP dump device attributes */

DEFINE_IPL_ATTR_RW(dump_fcp, wwpn, "0x%016llx\n", "%016llx\n",
		   dump_block_fcp->ipl_info.fcp.wwpn);
DEFINE_IPL_ATTR_RW(dump_fcp, lun, "0x%016llx\n", "%016llx\n",
		   dump_block_fcp->ipl_info.fcp.lun);
DEFINE_IPL_ATTR_RW(dump_fcp, bootprog, "%lld\n", "%lld\n",
		   dump_block_fcp->ipl_info.fcp.bootprog);
DEFINE_IPL_ATTR_RW(dump_fcp, br_lba, "%lld\n", "%lld\n",
		   dump_block_fcp->ipl_info.fcp.br_lba);
DEFINE_IPL_ATTR_RW(dump_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
		   dump_block_fcp->ipl_info.fcp.devno);

static struct attribute *dump_fcp_attrs[] = {
	&sys_dump_fcp_device_attr.attr,
	&sys_dump_fcp_wwpn_attr.attr,
	&sys_dump_fcp_lun_attr.attr,
	&sys_dump_fcp_bootprog_attr.attr,
	&sys_dump_fcp_br_lba_attr.attr,
	NULL,
};

static struct attribute_group dump_fcp_attr_group = {
	.name  = IPL_FCP_STR,
	.attrs = dump_fcp_attrs,
};

/* CCW dump device attributes */

DEFINE_IPL_ATTR_RW(dump_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
		   dump_block_ccw->ipl_info.ccw.devno);

static struct attribute *dump_ccw_attrs[] = {
	&sys_dump_ccw_device_attr.attr,
	NULL,
};

static struct attribute_group dump_ccw_attr_group = {
	.name  = IPL_CCW_STR,
	.attrs = dump_ccw_attrs,
};

/* dump type */

static int dump_set_type(enum ipl_type type)
{
	if (!(dump_capabilities & type))
		return -EINVAL;
	switch(type) {
	case IPL_TYPE_CCW:
		if (MACHINE_IS_VM)
			dump_method = IPL_METHOD_CCW_VM;
		else
			dump_method = IPL_METHOD_CCW_CIO;
		break;
	case IPL_TYPE_FCP:
		dump_method = IPL_METHOD_FCP_RW_DIAG;
		break;
	default:
		dump_method = IPL_METHOD_NONE;
	}
	dump_type = type;
	return 0;
}

static ssize_t dump_type_show(struct subsystem *subsys, char *page)
{
	return sprintf(page, "%s\n", ipl_type_str(dump_type));
}

static ssize_t dump_type_store(struct subsystem *subsys, const char *buf,
			       size_t len)
{
	int rc = -EINVAL;

	if (strncmp(buf, IPL_NONE_STR, strlen(IPL_NONE_STR)) == 0)
		rc = dump_set_type(IPL_TYPE_NONE);
	else if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
		rc = dump_set_type(IPL_TYPE_CCW);
	else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
		rc = dump_set_type(IPL_TYPE_FCP);
	return (rc != 0) ? rc : len;
}

static struct subsys_attribute dump_type_attr =
		__ATTR(dump_type, 0644, dump_type_show, dump_type_store);

static decl_subsys(dump, NULL, NULL);

#ifdef CONFIG_SMP
static void dump_smp_stop_all(void)
{
	int cpu;
	preempt_disable();
	for_each_online_cpu(cpu) {
		if (cpu == smp_processor_id())
			continue;
		while (signal_processor(cpu, sigp_stop) == sigp_busy)
			udelay(10);
	}
	preempt_enable();
}
#else
#define dump_smp_stop_all() do { } while (0)
#endif

/*
 * Shutdown actions section
 */

static decl_subsys(shutdown_actions, NULL, NULL);

/* on panic */

static ssize_t on_panic_show(struct subsystem *subsys, char *page)
{
	return sprintf(page, "%s\n", shutdown_action_str(on_panic_action));
}

static ssize_t on_panic_store(struct subsystem *subsys, const char *buf,
			      size_t len)
{
	if (strncmp(buf, SHUTDOWN_REIPL_STR, strlen(SHUTDOWN_REIPL_STR)) == 0)
		on_panic_action = SHUTDOWN_REIPL;
	else if (strncmp(buf, SHUTDOWN_DUMP_STR,
			 strlen(SHUTDOWN_DUMP_STR)) == 0)
		on_panic_action = SHUTDOWN_DUMP;
	else if (strncmp(buf, SHUTDOWN_STOP_STR,
			 strlen(SHUTDOWN_STOP_STR)) == 0)
		on_panic_action = SHUTDOWN_STOP;
	else
		return -EINVAL;

	return len;
}

static struct subsys_attribute on_panic_attr =
		__ATTR(on_panic, 0644, on_panic_show, on_panic_store);

static void print_fcp_block(struct ipl_parameter_block *fcp_block)
{
	printk(KERN_EMERG "wwpn:      %016llx\n",
		(unsigned long long)fcp_block->ipl_info.fcp.wwpn);
	printk(KERN_EMERG "lun:       %016llx\n",
		(unsigned long long)fcp_block->ipl_info.fcp.lun);
	printk(KERN_EMERG "bootprog:  %lld\n",
		(unsigned long long)fcp_block->ipl_info.fcp.bootprog);
	printk(KERN_EMERG "br_lba:    %lld\n",
		(unsigned long long)fcp_block->ipl_info.fcp.br_lba);
	printk(KERN_EMERG "device:    %llx\n",
		(unsigned long long)fcp_block->ipl_info.fcp.devno);
	printk(KERN_EMERG "opt:       %x\n", fcp_block->ipl_info.fcp.opt);
}

void do_reipl(void)
{
	struct ccw_dev_id devid;
	static char buf[100];
648
	char loadparm[LOADPARM_LEN + 1];
M
Michael Holzheu 已提交
649 650 651

	switch (reipl_type) {
	case IPL_TYPE_CCW:
652
		reipl_get_ascii_loadparm(loadparm);
M
Michael Holzheu 已提交
653 654
		printk(KERN_EMERG "reboot on ccw device: 0.0.%04x\n",
			reipl_block_ccw->ipl_info.ccw.devno);
655
		printk(KERN_EMERG "loadparm = '%s'\n", loadparm);
M
Michael Holzheu 已提交
656 657 658 659 660 661 662 663 664 665 666 667
		break;
	case IPL_TYPE_FCP:
		printk(KERN_EMERG "reboot on fcp device:\n");
		print_fcp_block(reipl_block_fcp);
		break;
	default:
		break;
	}

	switch (reipl_method) {
	case IPL_METHOD_CCW_CIO:
		devid.devno = reipl_block_ccw->ipl_info.ccw.devno;
668 669
		if (ipl_get_type() == IPL_TYPE_CCW && devid.devno == ipl_devno)
			diag308(DIAG308_IPL, NULL);
M
Michael Holzheu 已提交
670 671 672 673
		devid.ssid  = 0;
		reipl_ccw_dev(&devid);
		break;
	case IPL_METHOD_CCW_VM:
674 675 676 677 678 679
		if (strlen(loadparm) == 0)
			sprintf(buf, "IPL %X",
				reipl_block_ccw->ipl_info.ccw.devno);
		else
			sprintf(buf, "IPL %X LOADPARM '%s'",
				reipl_block_ccw->ipl_info.ccw.devno, loadparm);
680
		__cpcmd(buf, NULL, 0, NULL);
M
Michael Holzheu 已提交
681 682 683 684 685 686 687 688 689 690 691 692 693
		break;
	case IPL_METHOD_CCW_DIAG:
		diag308(DIAG308_SET, reipl_block_ccw);
		diag308(DIAG308_IPL, NULL);
		break;
	case IPL_METHOD_FCP_RW_DIAG:
		diag308(DIAG308_SET, reipl_block_fcp);
		diag308(DIAG308_IPL, NULL);
		break;
	case IPL_METHOD_FCP_RO_DIAG:
		diag308(DIAG308_IPL, NULL);
		break;
	case IPL_METHOD_FCP_RO_VM:
694
		__cpcmd("IPL", NULL, 0, NULL);
M
Michael Holzheu 已提交
695 696 697 698
		break;
	case IPL_METHOD_NONE:
	default:
		if (MACHINE_IS_VM)
699
			__cpcmd("IPL", NULL, 0, NULL);
M
Michael Holzheu 已提交
700 701 702
		diag308(DIAG308_IPL, NULL);
		break;
	}
703 704
	printk(KERN_EMERG "reboot failed!\n");
	signal_processor(smp_processor_id(), sigp_stop_and_store_status);
M
Michael Holzheu 已提交
705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734
}

static void do_dump(void)
{
	struct ccw_dev_id devid;
	static char buf[100];

	switch (dump_type) {
	case IPL_TYPE_CCW:
		printk(KERN_EMERG "Automatic dump on ccw device: 0.0.%04x\n",
		       dump_block_ccw->ipl_info.ccw.devno);
		break;
	case IPL_TYPE_FCP:
		printk(KERN_EMERG "Automatic dump on fcp device:\n");
		print_fcp_block(dump_block_fcp);
		break;
	default:
		return;
	}

	switch (dump_method) {
	case IPL_METHOD_CCW_CIO:
		dump_smp_stop_all();
		devid.devno = dump_block_ccw->ipl_info.ccw.devno;
		devid.ssid  = 0;
		reipl_ccw_dev(&devid);
		break;
	case IPL_METHOD_CCW_VM:
		dump_smp_stop_all();
		sprintf(buf, "STORE STATUS");
735
		__cpcmd(buf, NULL, 0, NULL);
M
Michael Holzheu 已提交
736
		sprintf(buf, "IPL %X", dump_block_ccw->ipl_info.ccw.devno);
737
		__cpcmd(buf, NULL, 0, NULL);
M
Michael Holzheu 已提交
738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833
		break;
	case IPL_METHOD_CCW_DIAG:
		diag308(DIAG308_SET, dump_block_ccw);
		diag308(DIAG308_DUMP, NULL);
		break;
	case IPL_METHOD_FCP_RW_DIAG:
		diag308(DIAG308_SET, dump_block_fcp);
		diag308(DIAG308_DUMP, NULL);
		break;
	case IPL_METHOD_NONE:
	default:
		return;
	}
	printk(KERN_EMERG "Dump failed!\n");
}

/* init functions */

static int __init ipl_register_fcp_files(void)
{
	int rc;

	rc = sysfs_create_group(&ipl_subsys.kset.kobj,
				&ipl_fcp_attr_group);
	if (rc)
		goto out;
	rc = sysfs_create_bin_file(&ipl_subsys.kset.kobj,
				   &ipl_parameter_attr);
	if (rc)
		goto out_ipl_parm;
	rc = sysfs_create_bin_file(&ipl_subsys.kset.kobj,
				   &ipl_scp_data_attr);
	if (!rc)
		goto out;

	sysfs_remove_bin_file(&ipl_subsys.kset.kobj, &ipl_parameter_attr);

out_ipl_parm:
	sysfs_remove_group(&ipl_subsys.kset.kobj, &ipl_fcp_attr_group);
out:
	return rc;
}

static int __init ipl_init(void)
{
	int rc;

	rc = firmware_register(&ipl_subsys);
	if (rc)
		return rc;
	switch (ipl_get_type()) {
	case IPL_TYPE_CCW:
		rc = sysfs_create_group(&ipl_subsys.kset.kobj,
					&ipl_ccw_attr_group);
		break;
	case IPL_TYPE_FCP:
		rc = ipl_register_fcp_files();
		break;
	default:
		rc = sysfs_create_group(&ipl_subsys.kset.kobj,
					&ipl_unknown_attr_group);
		break;
	}
	if (rc)
		firmware_unregister(&ipl_subsys);
	return rc;
}

static void __init reipl_probe(void)
{
	void *buffer;

	buffer = (void *) get_zeroed_page(GFP_KERNEL);
	if (!buffer)
		return;
	if (diag308(DIAG308_STORE, buffer) == DIAG308_RC_OK)
		diag308_set_works = 1;
	free_page((unsigned long)buffer);
}

static int __init reipl_ccw_init(void)
{
	int rc;

	reipl_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
	if (!reipl_block_ccw)
		return -ENOMEM;
	rc = sysfs_create_group(&reipl_subsys.kset.kobj, &reipl_ccw_attr_group);
	if (rc) {
		free_page((unsigned long)reipl_block_ccw);
		return rc;
	}
	reipl_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
	reipl_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
	reipl_block_ccw->hdr.blk0_len = sizeof(reipl_block_ccw->ipl_info.ccw);
	reipl_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
834 835 836 837 838 839 840 841 842 843 844
	/* check if read scp info worked and set loadparm */
	if (SCCB_VALID)
		memcpy(reipl_block_ccw->ipl_info.ccw.load_param,
		       SCCB_LOADPARM, LOADPARM_LEN);
	else
		/* read scp info failed: set empty loadparm (EBCDIC blanks) */
		memset(reipl_block_ccw->ipl_info.ccw.load_param, 0x40,
		       LOADPARM_LEN);
	/* FIXME: check for diag308_set_works when enabling diag ccw reipl */
	if (!MACHINE_IS_VM)
		sys_reipl_ccw_loadparm_attr.attr.mode = S_IRUGO;
M
Michael Holzheu 已提交
845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929
	if (ipl_get_type() == IPL_TYPE_CCW)
		reipl_block_ccw->ipl_info.ccw.devno = ipl_devno;
	reipl_capabilities |= IPL_TYPE_CCW;
	return 0;
}

static int __init reipl_fcp_init(void)
{
	int rc;

	if ((!diag308_set_works) && (ipl_get_type() != IPL_TYPE_FCP))
		return 0;
	if ((!diag308_set_works) && (ipl_get_type() == IPL_TYPE_FCP))
		make_attrs_ro(reipl_fcp_attrs);

	reipl_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
	if (!reipl_block_fcp)
		return -ENOMEM;
	rc = sysfs_create_group(&reipl_subsys.kset.kobj, &reipl_fcp_attr_group);
	if (rc) {
		free_page((unsigned long)reipl_block_fcp);
		return rc;
	}
	if (ipl_get_type() == IPL_TYPE_FCP) {
		memcpy(reipl_block_fcp, IPL_PARMBLOCK_START, PAGE_SIZE);
	} else {
		reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
		reipl_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
		reipl_block_fcp->hdr.blk0_len =
			sizeof(reipl_block_fcp->ipl_info.fcp);
		reipl_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
		reipl_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_IPL;
	}
	reipl_capabilities |= IPL_TYPE_FCP;
	return 0;
}

static int __init reipl_init(void)
{
	int rc;

	rc = firmware_register(&reipl_subsys);
	if (rc)
		return rc;
	rc = subsys_create_file(&reipl_subsys, &reipl_type_attr);
	if (rc) {
		firmware_unregister(&reipl_subsys);
		return rc;
	}
	rc = reipl_ccw_init();
	if (rc)
		return rc;
	rc = reipl_fcp_init();
	if (rc)
		return rc;
	rc = reipl_set_type(ipl_get_type());
	if (rc)
		return rc;
	return 0;
}

static int __init dump_ccw_init(void)
{
	int rc;

	dump_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
	if (!dump_block_ccw)
		return -ENOMEM;
	rc = sysfs_create_group(&dump_subsys.kset.kobj, &dump_ccw_attr_group);
	if (rc) {
		free_page((unsigned long)dump_block_ccw);
		return rc;
	}
	dump_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
	dump_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
	dump_block_ccw->hdr.blk0_len = sizeof(reipl_block_ccw->ipl_info.ccw);
	dump_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
	dump_capabilities |= IPL_TYPE_CCW;
	return 0;
}

static int __init dump_fcp_init(void)
{
	int rc;

930
	if(!(SCCB_FLAG & 0x2) || !SCCB_VALID)
M
Michael Holzheu 已提交
931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027
		return 0; /* LDIPL DUMP is not installed */
	if (!diag308_set_works)
		return 0;
	dump_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
	if (!dump_block_fcp)
		return -ENOMEM;
	rc = sysfs_create_group(&dump_subsys.kset.kobj, &dump_fcp_attr_group);
	if (rc) {
		free_page((unsigned long)dump_block_fcp);
		return rc;
	}
	dump_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
	dump_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
	dump_block_fcp->hdr.blk0_len = sizeof(dump_block_fcp->ipl_info.fcp);
	dump_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
	dump_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_DUMP;
	dump_capabilities |= IPL_TYPE_FCP;
	return 0;
}

#define SHUTDOWN_ON_PANIC_PRIO 0

static int shutdown_on_panic_notify(struct notifier_block *self,
				    unsigned long event, void *data)
{
	if (on_panic_action == SHUTDOWN_DUMP)
		do_dump();
	else if (on_panic_action == SHUTDOWN_REIPL)
		do_reipl();
	return NOTIFY_OK;
}

static struct notifier_block shutdown_on_panic_nb = {
	.notifier_call = shutdown_on_panic_notify,
	.priority = SHUTDOWN_ON_PANIC_PRIO
};

static int __init dump_init(void)
{
	int rc;

	rc = firmware_register(&dump_subsys);
	if (rc)
		return rc;
	rc = subsys_create_file(&dump_subsys, &dump_type_attr);
	if (rc) {
		firmware_unregister(&dump_subsys);
		return rc;
	}
	rc = dump_ccw_init();
	if (rc)
		return rc;
	rc = dump_fcp_init();
	if (rc)
		return rc;
	dump_set_type(IPL_TYPE_NONE);
	return 0;
}

static int __init shutdown_actions_init(void)
{
	int rc;

	rc = firmware_register(&shutdown_actions_subsys);
	if (rc)
		return rc;
	rc = subsys_create_file(&shutdown_actions_subsys, &on_panic_attr);
	if (rc) {
		firmware_unregister(&shutdown_actions_subsys);
		return rc;
	}
	atomic_notifier_chain_register(&panic_notifier_list,
				       &shutdown_on_panic_nb);
	return 0;
}

static int __init s390_ipl_init(void)
{
	int rc;

	reipl_probe();
	rc = ipl_init();
	if (rc)
		return rc;
	rc = reipl_init();
	if (rc)
		return rc;
	rc = dump_init();
	if (rc)
		return rc;
	rc = shutdown_actions_init();
	if (rc)
		return rc;
	return 0;
}

__initcall(s390_ipl_init);
1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080

static LIST_HEAD(rcall);
static DEFINE_MUTEX(rcall_mutex);

void register_reset_call(struct reset_call *reset)
{
	mutex_lock(&rcall_mutex);
	list_add(&reset->list, &rcall);
	mutex_unlock(&rcall_mutex);
}
EXPORT_SYMBOL_GPL(register_reset_call);

void unregister_reset_call(struct reset_call *reset)
{
	mutex_lock(&rcall_mutex);
	list_del(&reset->list);
	mutex_unlock(&rcall_mutex);
}
EXPORT_SYMBOL_GPL(unregister_reset_call);

static void do_reset_calls(void)
{
	struct reset_call *reset;

	list_for_each_entry(reset, &rcall, list)
		reset->fn();
}

extern void reset_mcck_handler(void);

void s390_reset_system(void)
{
	struct _lowcore *lc;

	/* Disable all interrupts/machine checks */
	__load_psw_mask(PSW_KERNEL_BITS & ~PSW_MASK_MCHECK);

	/* Stack for interrupt/machine check handler */
	lc = (struct _lowcore *)(unsigned long) store_prefix();
	lc->panic_stack = S390_lowcore.panic_stack;

	/* Disable prefixing */
	set_prefix(0);

	/* Disable lowcore protection */
	__ctl_clear_bit(0,28);

	/* Set new machine check handler */
	S390_lowcore.mcck_new_psw.mask = PSW_KERNEL_BITS & ~PSW_MASK_MCHECK;
	S390_lowcore.mcck_new_psw.addr =
		PSW_ADDR_AMODE | (unsigned long) &reset_mcck_handler;
	do_reset_calls();
}