ipl.c 45.7 KB
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/*
 *  arch/s390/kernel/ipl.c
 *    ipl/reipl/dump support for Linux on s390.
 *
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 *    Copyright IBM Corp. 2005,2007
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 *    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>
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#include <linux/ctype.h>
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#include <linux/fs.h>
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#include <asm/ipl.h>
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#include <asm/smp.h>
#include <asm/setup.h>
#include <asm/cpcmd.h>
#include <asm/cio.h>
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#include <asm/ebcdic.h>
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#include <asm/reset.h>
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#include <asm/sclp.h>
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#include <asm/sigp.h>
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#include <asm/checksum.h>
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#define IPL_PARM_BLOCK_VERSION 0
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#define IPL_UNKNOWN_STR		"unknown"
#define IPL_CCW_STR		"ccw"
#define IPL_FCP_STR		"fcp"
#define IPL_FCP_DUMP_STR	"fcp_dump"
#define IPL_NSS_STR		"nss"
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#define DUMP_CCW_STR		"ccw"
#define DUMP_FCP_STR		"fcp"
#define DUMP_NONE_STR		"none"

/*
 * Four shutdown trigger types are supported:
 * - panic
 * - halt
 * - power off
 * - reipl
 */
#define ON_PANIC_STR		"on_panic"
#define ON_HALT_STR		"on_halt"
#define ON_POFF_STR		"on_poff"
#define ON_REIPL_STR		"on_reboot"

struct shutdown_action;
struct shutdown_trigger {
	char *name;
	struct shutdown_action *action;
};

/*
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 * The following shutdown action types are supported:
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 */
#define SHUTDOWN_ACTION_IPL_STR		"ipl"
#define SHUTDOWN_ACTION_REIPL_STR	"reipl"
#define SHUTDOWN_ACTION_DUMP_STR	"dump"
#define SHUTDOWN_ACTION_VMCMD_STR	"vmcmd"
#define SHUTDOWN_ACTION_STOP_STR	"stop"
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#define SHUTDOWN_ACTION_DUMP_REIPL_STR	"dump_reipl"
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struct shutdown_action {
	char *name;
	void (*fn) (struct shutdown_trigger *trigger);
	int (*init) (void);
};

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static char *ipl_type_str(enum ipl_type type)
{
	switch (type) {
	case IPL_TYPE_CCW:
		return IPL_CCW_STR;
	case IPL_TYPE_FCP:
		return IPL_FCP_STR;
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	case IPL_TYPE_FCP_DUMP:
		return IPL_FCP_DUMP_STR;
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	case IPL_TYPE_NSS:
		return IPL_NSS_STR;
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	case IPL_TYPE_UNKNOWN:
	default:
		return IPL_UNKNOWN_STR;
	}
}

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enum dump_type {
	DUMP_TYPE_NONE	= 1,
	DUMP_TYPE_CCW	= 2,
	DUMP_TYPE_FCP	= 4,
};

static char *dump_type_str(enum dump_type type)
{
	switch (type) {
	case DUMP_TYPE_NONE:
		return DUMP_NONE_STR;
	case DUMP_TYPE_CCW:
		return DUMP_CCW_STR;
	case DUMP_TYPE_FCP:
		return DUMP_FCP_STR;
	default:
		return NULL;
	}
}

/*
 * Must be in data section since the bss section
 * is not cleared when these are accessed.
 */
static u16 ipl_devno __attribute__((__section__(".data"))) = 0;
u32 ipl_flags __attribute__((__section__(".data"))) = 0;

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enum ipl_method {
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	REIPL_METHOD_CCW_CIO,
	REIPL_METHOD_CCW_DIAG,
	REIPL_METHOD_CCW_VM,
	REIPL_METHOD_FCP_RO_DIAG,
	REIPL_METHOD_FCP_RW_DIAG,
	REIPL_METHOD_FCP_RO_VM,
	REIPL_METHOD_FCP_DUMP,
	REIPL_METHOD_NSS,
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	REIPL_METHOD_NSS_DIAG,
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	REIPL_METHOD_DEFAULT,
};

enum dump_method {
	DUMP_METHOD_NONE,
	DUMP_METHOD_CCW_CIO,
	DUMP_METHOD_CCW_DIAG,
	DUMP_METHOD_CCW_VM,
	DUMP_METHOD_FCP_DIAG,
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};

static int diag308_set_works = 0;

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static struct ipl_parameter_block ipl_block;

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static int reipl_capabilities = IPL_TYPE_UNKNOWN;
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static enum ipl_type reipl_type = IPL_TYPE_UNKNOWN;
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static enum ipl_method reipl_method = REIPL_METHOD_DEFAULT;
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static struct ipl_parameter_block *reipl_block_fcp;
static struct ipl_parameter_block *reipl_block_ccw;
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static struct ipl_parameter_block *reipl_block_nss;
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static struct ipl_parameter_block *reipl_block_actual;
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static int dump_capabilities = DUMP_TYPE_NONE;
static enum dump_type dump_type = DUMP_TYPE_NONE;
static enum dump_method dump_method = DUMP_METHOD_NONE;
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static struct ipl_parameter_block *dump_block_fcp;
static struct ipl_parameter_block *dump_block_ccw;

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static struct sclp_ipl_info sclp_ipl_info;

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int diag308(unsigned long subcode, void *addr)
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{
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	register unsigned long _addr asm("0") = (unsigned long) addr;
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	register unsigned long _rc asm("1") = 0;

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	asm volatile(
		"	diag	%0,%2,0x308\n"
		"0:\n"
		EX_TABLE(0b,0b)
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		: "+d" (_addr), "+d" (_rc)
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		: "d" (subcode) : "cc", "memory");
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	return _rc;
}
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EXPORT_SYMBOL_GPL(diag308);
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/* SYSFS */

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

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

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#define DEFINE_IPL_ATTR_STR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)\
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static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj,	\
		struct kobj_attribute *attr,				\
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		char *page)						\
{									\
	return sprintf(page, _fmt_out, _value);				\
}									\
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static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,	\
		struct kobj_attribute *attr,				\
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		const char *buf, size_t len)				\
{									\
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	strncpy(_value, buf, sizeof(_value) - 1);			\
	strstrip(_value);						\
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	return len;							\
}									\
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static struct kobj_attribute sys_##_prefix##_##_name##_attr =		\
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	__ATTR(_name,(S_IRUGO | S_IWUSR),				\
			sys_##_prefix##_##_name##_show,			\
			sys_##_prefix##_##_name##_store);

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

/*
 * ipl section
 */

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

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	if (ipl_flags & IPL_NSS_VALID)
		return IPL_TYPE_NSS;
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	if (!(ipl_flags & IPL_DEVNO_VALID))
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		return IPL_TYPE_UNKNOWN;
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	if (!(ipl_flags & IPL_PARMBLOCK_VALID))
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		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;
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	if (ipl->ipl_info.fcp.opt == DIAG308_IPL_OPT_DUMP)
		return IPL_TYPE_FCP_DUMP;
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	return IPL_TYPE_FCP;
}

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struct ipl_info ipl_info;
EXPORT_SYMBOL_GPL(ipl_info);

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static ssize_t ipl_type_show(struct kobject *kobj, struct kobj_attribute *attr,
			     char *page)
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{
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	return sprintf(page, "%s\n", ipl_type_str(ipl_info.type));
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}

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static struct kobj_attribute sys_ipl_type_attr = __ATTR_RO(ipl_type);
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/* VM IPL PARM routines */
static void reipl_get_ascii_vmparm(char *dest,
				   const struct ipl_parameter_block *ipb)
{
	int i;
	int len = 0;
	char has_lowercase = 0;

	if ((ipb->ipl_info.ccw.vm_flags & DIAG308_VM_FLAGS_VP_VALID) &&
	    (ipb->ipl_info.ccw.vm_parm_len > 0)) {

		len = ipb->ipl_info.ccw.vm_parm_len;
		memcpy(dest, ipb->ipl_info.ccw.vm_parm, len);
		/* If at least one character is lowercase, we assume mixed
		 * case; otherwise we convert everything to lowercase.
		 */
		for (i = 0; i < len; i++)
			if ((dest[i] > 0x80 && dest[i] < 0x8a) || /* a-i */
			    (dest[i] > 0x90 && dest[i] < 0x9a) || /* j-r */
			    (dest[i] > 0xa1 && dest[i] < 0xaa)) { /* s-z */
				has_lowercase = 1;
				break;
			}
		if (!has_lowercase)
			EBC_TOLOWER(dest, len);
		EBCASC(dest, len);
	}
	dest[len] = 0;
}

void get_ipl_vmparm(char *dest)
{
	if (diag308_set_works && (ipl_block.hdr.pbt == DIAG308_IPL_TYPE_CCW))
		reipl_get_ascii_vmparm(dest, &ipl_block);
	else
		dest[0] = 0;
}

static ssize_t ipl_vm_parm_show(struct kobject *kobj,
				struct kobj_attribute *attr, char *page)
{
	char parm[DIAG308_VMPARM_SIZE + 1] = {};

	get_ipl_vmparm(parm);
	return sprintf(page, "%s\n", parm);
}

static struct kobj_attribute sys_ipl_vm_parm_attr =
	__ATTR(parm, S_IRUGO, ipl_vm_parm_show, NULL);

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static ssize_t sys_ipl_device_show(struct kobject *kobj,
				   struct kobj_attribute *attr, char *page)
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{
	struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;

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

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

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static ssize_t ipl_parameter_read(struct kobject *kobj, struct bin_attribute *attr,
				  char *buf, loff_t off, size_t count)
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{
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	return memory_read_from_buffer(buf, count, &off, IPL_PARMBLOCK_START,
					IPL_PARMBLOCK_SIZE);
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}

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

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

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	return memory_read_from_buffer(buf, count, &off, scp_data, size);
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}

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

/* 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 */

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static ssize_t ipl_ccw_loadparm_show(struct kobject *kobj,
				     struct kobj_attribute *attr, char *page)
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{
	char loadparm[LOADPARM_LEN + 1] = {};

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	if (!sclp_ipl_info.is_valid)
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		return sprintf(page, "#unknown#\n");
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	memcpy(loadparm, &sclp_ipl_info.loadparm, LOADPARM_LEN);
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	EBCASC(loadparm, LOADPARM_LEN);
	strstrip(loadparm);
	return sprintf(page, "%s\n", loadparm);
}

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

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static struct attribute *ipl_ccw_attrs_vm[] = {
	&sys_ipl_type_attr.attr,
	&sys_ipl_device_attr.attr,
	&sys_ipl_ccw_loadparm_attr.attr,
	&sys_ipl_vm_parm_attr.attr,
	NULL,
};

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

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static struct attribute_group ipl_ccw_attr_group_vm = {
	.attrs = ipl_ccw_attrs_vm,
};

static struct attribute_group ipl_ccw_attr_group_lpar = {
	.attrs = ipl_ccw_attrs_lpar
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};

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/* NSS ipl device attributes */

DEFINE_IPL_ATTR_RO(ipl_nss, name, "%s\n", kernel_nss_name);

static struct attribute *ipl_nss_attrs[] = {
	&sys_ipl_type_attr.attr,
	&sys_ipl_nss_name_attr.attr,
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	&sys_ipl_ccw_loadparm_attr.attr,
	&sys_ipl_vm_parm_attr.attr,
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	NULL,
};

static struct attribute_group ipl_nss_attr_group = {
	.attrs = ipl_nss_attrs,
};

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/* 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,
};

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static struct kset *ipl_kset;
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static int __init ipl_register_fcp_files(void)
{
	int rc;

	rc = sysfs_create_group(&ipl_kset->kobj, &ipl_fcp_attr_group);
	if (rc)
		goto out;
	rc = sysfs_create_bin_file(&ipl_kset->kobj, &ipl_parameter_attr);
	if (rc)
		goto out_ipl_parm;
	rc = sysfs_create_bin_file(&ipl_kset->kobj, &ipl_scp_data_attr);
	if (!rc)
		goto out;

	sysfs_remove_bin_file(&ipl_kset->kobj, &ipl_parameter_attr);

out_ipl_parm:
	sysfs_remove_group(&ipl_kset->kobj, &ipl_fcp_attr_group);
out:
	return rc;
}

static void ipl_run(struct shutdown_trigger *trigger)
{
	diag308(DIAG308_IPL, NULL);
	if (MACHINE_IS_VM)
		__cpcmd("IPL", NULL, 0, NULL);
	else if (ipl_info.type == IPL_TYPE_CCW)
		reipl_ccw_dev(&ipl_info.data.ccw.dev_id);
}

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static int __init ipl_init(void)
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{
	int rc;

	ipl_kset = kset_create_and_add("ipl", NULL, firmware_kobj);
	if (!ipl_kset) {
		rc = -ENOMEM;
		goto out;
	}
	switch (ipl_info.type) {
	case IPL_TYPE_CCW:
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		if (MACHINE_IS_VM)
			rc = sysfs_create_group(&ipl_kset->kobj,
						&ipl_ccw_attr_group_vm);
		else
			rc = sysfs_create_group(&ipl_kset->kobj,
						&ipl_ccw_attr_group_lpar);
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		break;
	case IPL_TYPE_FCP:
	case IPL_TYPE_FCP_DUMP:
		rc = ipl_register_fcp_files();
		break;
	case IPL_TYPE_NSS:
		rc = sysfs_create_group(&ipl_kset->kobj, &ipl_nss_attr_group);
		break;
	default:
		rc = sysfs_create_group(&ipl_kset->kobj,
					&ipl_unknown_attr_group);
		break;
	}
out:
	if (rc)
		panic("ipl_init failed: rc = %i\n", rc);

	return 0;
}

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static struct shutdown_action __refdata ipl_action = {
	.name	= SHUTDOWN_ACTION_IPL_STR,
	.fn	= ipl_run,
	.init	= ipl_init,
};
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/*
546
 * reipl shutdown action: Reboot Linux on shutdown.
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 */

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/* VM IPL PARM attributes */
static ssize_t reipl_generic_vmparm_show(struct ipl_parameter_block *ipb,
					  char *page)
{
	char vmparm[DIAG308_VMPARM_SIZE + 1] = {};

	reipl_get_ascii_vmparm(vmparm, ipb);
	return sprintf(page, "%s\n", vmparm);
}

static ssize_t reipl_generic_vmparm_store(struct ipl_parameter_block *ipb,
					  size_t vmparm_max,
					  const char *buf, size_t len)
{
	int i, ip_len;

	/* ignore trailing newline */
	ip_len = len;
	if ((len > 0) && (buf[len - 1] == '\n'))
		ip_len--;

	if (ip_len > vmparm_max)
		return -EINVAL;

	/* parm is used to store kernel options, check for common chars */
	for (i = 0; i < ip_len; i++)
		if (!(isalnum(buf[i]) || isascii(buf[i]) || isprint(buf[i])))
			return -EINVAL;

	memset(ipb->ipl_info.ccw.vm_parm, 0, DIAG308_VMPARM_SIZE);
	ipb->ipl_info.ccw.vm_parm_len = ip_len;
	if (ip_len > 0) {
		ipb->ipl_info.ccw.vm_flags |= DIAG308_VM_FLAGS_VP_VALID;
		memcpy(ipb->ipl_info.ccw.vm_parm, buf, ip_len);
		ASCEBC(ipb->ipl_info.ccw.vm_parm, ip_len);
	} else {
		ipb->ipl_info.ccw.vm_flags &= ~DIAG308_VM_FLAGS_VP_VALID;
	}

	return len;
}

/* NSS wrapper */
static ssize_t reipl_nss_vmparm_show(struct kobject *kobj,
				     struct kobj_attribute *attr, char *page)
{
	return reipl_generic_vmparm_show(reipl_block_nss, page);
}

static ssize_t reipl_nss_vmparm_store(struct kobject *kobj,
				      struct kobj_attribute *attr,
				      const char *buf, size_t len)
{
	return reipl_generic_vmparm_store(reipl_block_nss, 56, buf, len);
}

/* CCW wrapper */
static ssize_t reipl_ccw_vmparm_show(struct kobject *kobj,
				     struct kobj_attribute *attr, char *page)
{
	return reipl_generic_vmparm_show(reipl_block_ccw, page);
}

static ssize_t reipl_ccw_vmparm_store(struct kobject *kobj,
				      struct kobj_attribute *attr,
				      const char *buf, size_t len)
{
	return reipl_generic_vmparm_store(reipl_block_ccw, 64, buf, len);
}

static struct kobj_attribute sys_reipl_nss_vmparm_attr =
	__ATTR(parm, S_IRUGO | S_IWUSR, reipl_nss_vmparm_show,
					reipl_nss_vmparm_store);
static struct kobj_attribute sys_reipl_ccw_vmparm_attr =
	__ATTR(parm, S_IRUGO | S_IWUSR, reipl_ccw_vmparm_show,
					reipl_ccw_vmparm_store);

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/* 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);

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static void reipl_get_ascii_loadparm(char *loadparm,
				     struct ipl_parameter_block *ibp)
660
{
661
	memcpy(loadparm, ibp->ipl_info.ccw.load_parm, LOADPARM_LEN);
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	EBCASC(loadparm, LOADPARM_LEN);
	loadparm[LOADPARM_LEN] = 0;
	strstrip(loadparm);
}

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static ssize_t reipl_generic_loadparm_show(struct ipl_parameter_block *ipb,
					   char *page)
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{
	char buf[LOADPARM_LEN + 1];

672
	reipl_get_ascii_loadparm(buf, ipb);
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	return sprintf(page, "%s\n", buf);
}

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static ssize_t reipl_generic_loadparm_store(struct ipl_parameter_block *ipb,
					    const char *buf, size_t len)
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{
	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 */
696
	memset(ipb->ipl_info.ccw.load_parm, ' ', LOADPARM_LEN);
697
	/* copy and convert to ebcdic */
698 699
	memcpy(ipb->ipl_info.ccw.load_parm, buf, lp_len);
	ASCEBC(ipb->ipl_info.ccw.load_parm, LOADPARM_LEN);
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	return len;
}

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/* NSS wrapper */
static ssize_t reipl_nss_loadparm_show(struct kobject *kobj,
				       struct kobj_attribute *attr, char *page)
{
	return reipl_generic_loadparm_show(reipl_block_nss, page);
}

static ssize_t reipl_nss_loadparm_store(struct kobject *kobj,
					struct kobj_attribute *attr,
					const char *buf, size_t len)
{
	return reipl_generic_loadparm_store(reipl_block_nss, buf, len);
}

/* CCW wrapper */
static ssize_t reipl_ccw_loadparm_show(struct kobject *kobj,
				       struct kobj_attribute *attr, char *page)
{
	return reipl_generic_loadparm_show(reipl_block_ccw, page);
}

static ssize_t reipl_ccw_loadparm_store(struct kobject *kobj,
					struct kobj_attribute *attr,
					const char *buf, size_t len)
{
	return reipl_generic_loadparm_store(reipl_block_ccw, buf, len);
}

731
static struct kobj_attribute sys_reipl_ccw_loadparm_attr =
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	__ATTR(loadparm, S_IRUGO | S_IWUSR, reipl_ccw_loadparm_show,
					    reipl_ccw_loadparm_store);

static struct attribute *reipl_ccw_attrs_vm[] = {
	&sys_reipl_ccw_device_attr.attr,
	&sys_reipl_ccw_loadparm_attr.attr,
	&sys_reipl_ccw_vmparm_attr.attr,
	NULL,
};
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742
static struct attribute *reipl_ccw_attrs_lpar[] = {
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	&sys_reipl_ccw_device_attr.attr,
744
	&sys_reipl_ccw_loadparm_attr.attr,
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	NULL,
};

748
static struct attribute_group reipl_ccw_attr_group_vm = {
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	.name  = IPL_CCW_STR,
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	.attrs = reipl_ccw_attrs_vm,
};

static struct attribute_group reipl_ccw_attr_group_lpar = {
	.name  = IPL_CCW_STR,
	.attrs = reipl_ccw_attrs_lpar,
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};

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/* NSS reipl device attributes */
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static void reipl_get_ascii_nss_name(char *dst,
				     struct ipl_parameter_block *ipb)
{
	memcpy(dst, ipb->ipl_info.ccw.nss_name, NSS_NAME_SIZE);
	EBCASC(dst, NSS_NAME_SIZE);
	dst[NSS_NAME_SIZE] = 0;
}

static ssize_t reipl_nss_name_show(struct kobject *kobj,
				   struct kobj_attribute *attr, char *page)
{
	char nss_name[NSS_NAME_SIZE + 1] = {};

	reipl_get_ascii_nss_name(nss_name, reipl_block_nss);
	return sprintf(page, "%s\n", nss_name);
}

static ssize_t reipl_nss_name_store(struct kobject *kobj,
				    struct kobj_attribute *attr,
				    const char *buf, size_t len)
{
	int nss_len;

	/* ignore trailing newline */
	nss_len = len;
	if ((len > 0) && (buf[len - 1] == '\n'))
		nss_len--;
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	if (nss_len > NSS_NAME_SIZE)
		return -EINVAL;

	memset(reipl_block_nss->ipl_info.ccw.nss_name, 0x40, NSS_NAME_SIZE);
	if (nss_len > 0) {
		reipl_block_nss->ipl_info.ccw.vm_flags |=
			DIAG308_VM_FLAGS_NSS_VALID;
		memcpy(reipl_block_nss->ipl_info.ccw.nss_name, buf, nss_len);
		ASCEBC(reipl_block_nss->ipl_info.ccw.nss_name, nss_len);
		EBC_TOUPPER(reipl_block_nss->ipl_info.ccw.nss_name, nss_len);
	} else {
		reipl_block_nss->ipl_info.ccw.vm_flags &=
			~DIAG308_VM_FLAGS_NSS_VALID;
	}

	return len;
}

static struct kobj_attribute sys_reipl_nss_name_attr =
	__ATTR(name, S_IRUGO | S_IWUSR, reipl_nss_name_show,
					reipl_nss_name_store);

static struct kobj_attribute sys_reipl_nss_loadparm_attr =
	__ATTR(loadparm, S_IRUGO | S_IWUSR, reipl_nss_loadparm_show,
					    reipl_nss_loadparm_store);
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static struct attribute *reipl_nss_attrs[] = {
	&sys_reipl_nss_name_attr.attr,
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	&sys_reipl_nss_loadparm_attr.attr,
	&sys_reipl_nss_vmparm_attr.attr,
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	NULL,
};

static struct attribute_group reipl_nss_attr_group = {
	.name  = IPL_NSS_STR,
	.attrs = reipl_nss_attrs,
};

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/* reipl type */

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

	switch(type) {
	case IPL_TYPE_CCW:
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		if (diag308_set_works)
			reipl_method = REIPL_METHOD_CCW_DIAG;
		else if (MACHINE_IS_VM)
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			reipl_method = REIPL_METHOD_CCW_VM;
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		else
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			reipl_method = REIPL_METHOD_CCW_CIO;
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		reipl_block_actual = reipl_block_ccw;
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		break;
	case IPL_TYPE_FCP:
		if (diag308_set_works)
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			reipl_method = REIPL_METHOD_FCP_RW_DIAG;
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		else if (MACHINE_IS_VM)
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			reipl_method = REIPL_METHOD_FCP_RO_VM;
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		else
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			reipl_method = REIPL_METHOD_FCP_RO_DIAG;
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		reipl_block_actual = reipl_block_fcp;
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		break;
	case IPL_TYPE_FCP_DUMP:
		reipl_method = REIPL_METHOD_FCP_DUMP;
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		break;
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	case IPL_TYPE_NSS:
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		if (diag308_set_works)
			reipl_method = REIPL_METHOD_NSS_DIAG;
		else
			reipl_method = REIPL_METHOD_NSS;
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		reipl_block_actual = reipl_block_nss;
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		break;
	case IPL_TYPE_UNKNOWN:
		reipl_method = REIPL_METHOD_DEFAULT;
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		break;
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	default:
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		BUG();
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	}
	reipl_type = type;
	return 0;
}

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static ssize_t reipl_type_show(struct kobject *kobj,
			       struct kobj_attribute *attr, char *page)
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{
	return sprintf(page, "%s\n", ipl_type_str(reipl_type));
}

878 879 880
static ssize_t reipl_type_store(struct kobject *kobj,
				struct kobj_attribute *attr,
				const char *buf, size_t len)
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{
	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);
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	else if (strncmp(buf, IPL_NSS_STR, strlen(IPL_NSS_STR)) == 0)
		rc = reipl_set_type(IPL_TYPE_NSS);
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	return (rc != 0) ? rc : len;
}

893
static struct kobj_attribute reipl_type_attr =
894
	__ATTR(reipl_type, 0644, reipl_type_show, reipl_type_store);
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896
static struct kset *reipl_kset;
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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
static void get_ipl_string(char *dst, struct ipl_parameter_block *ipb,
			   const enum ipl_method m)
{
	char loadparm[LOADPARM_LEN + 1] = {};
	char vmparm[DIAG308_VMPARM_SIZE + 1] = {};
	char nss_name[NSS_NAME_SIZE + 1] = {};
	size_t pos = 0;

	reipl_get_ascii_loadparm(loadparm, ipb);
	reipl_get_ascii_nss_name(nss_name, ipb);
	reipl_get_ascii_vmparm(vmparm, ipb);

	switch (m) {
	case REIPL_METHOD_CCW_VM:
		pos = sprintf(dst, "IPL %X CLEAR", ipb->ipl_info.ccw.devno);
		break;
	case REIPL_METHOD_NSS:
		pos = sprintf(dst, "IPL %s", nss_name);
		break;
	default:
		break;
	}
	if (strlen(loadparm) > 0)
		pos += sprintf(dst + pos, " LOADPARM '%s'", loadparm);
	if (strlen(vmparm) > 0)
		sprintf(dst + pos, " PARM %s", vmparm);
}

926
static void reipl_run(struct shutdown_trigger *trigger)
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{
	struct ccw_dev_id devid;
929
	static char buf[128];
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	switch (reipl_method) {
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	case REIPL_METHOD_CCW_CIO:
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		devid.devno = reipl_block_ccw->ipl_info.ccw.devno;
		devid.ssid  = 0;
		reipl_ccw_dev(&devid);
		break;
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	case REIPL_METHOD_CCW_VM:
938
		get_ipl_string(buf, reipl_block_ccw, REIPL_METHOD_CCW_VM);
939
		__cpcmd(buf, NULL, 0, NULL);
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		break;
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	case REIPL_METHOD_CCW_DIAG:
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		diag308(DIAG308_SET, reipl_block_ccw);
		diag308(DIAG308_IPL, NULL);
		break;
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	case REIPL_METHOD_FCP_RW_DIAG:
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		diag308(DIAG308_SET, reipl_block_fcp);
		diag308(DIAG308_IPL, NULL);
		break;
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	case REIPL_METHOD_FCP_RO_DIAG:
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		diag308(DIAG308_IPL, NULL);
		break;
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	case REIPL_METHOD_FCP_RO_VM:
953
		__cpcmd("IPL", NULL, 0, NULL);
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		break;
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	case REIPL_METHOD_NSS_DIAG:
		diag308(DIAG308_SET, reipl_block_nss);
		diag308(DIAG308_IPL, NULL);
		break;
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	case REIPL_METHOD_NSS:
960
		get_ipl_string(buf, reipl_block_nss, REIPL_METHOD_NSS);
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		__cpcmd(buf, NULL, 0, NULL);
		break;
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	case REIPL_METHOD_DEFAULT:
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		if (MACHINE_IS_VM)
965
			__cpcmd("IPL", NULL, 0, NULL);
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		diag308(DIAG308_IPL, NULL);
		break;
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	case REIPL_METHOD_FCP_DUMP:
		break;
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	}
971
	disabled_wait((unsigned long) __builtin_return_address(0));
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}

974
static void reipl_block_ccw_init(struct ipl_parameter_block *ipb)
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{
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	ipb->hdr.len = IPL_PARM_BLK_CCW_LEN;
	ipb->hdr.version = IPL_PARM_BLOCK_VERSION;
	ipb->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
	ipb->hdr.pbt = DIAG308_IPL_TYPE_CCW;
}
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static void reipl_block_ccw_fill_parms(struct ipl_parameter_block *ipb)
{
	/* LOADPARM */
	/* check if read scp info worked and set loadparm */
	if (sclp_ipl_info.is_valid)
		memcpy(ipb->ipl_info.ccw.load_parm,
				&sclp_ipl_info.loadparm, LOADPARM_LEN);
	else
		/* read scp info failed: set empty loadparm (EBCDIC blanks) */
		memset(ipb->ipl_info.ccw.load_parm, 0x40, LOADPARM_LEN);
	ipb->hdr.flags = DIAG308_FLAGS_LP_VALID;

	/* VM PARM */
	if (MACHINE_IS_VM && diag308_set_works &&
	    (ipl_block.ipl_info.ccw.vm_flags & DIAG308_VM_FLAGS_VP_VALID)) {

		ipb->ipl_info.ccw.vm_flags |= DIAG308_VM_FLAGS_VP_VALID;
		ipb->ipl_info.ccw.vm_parm_len =
					ipl_block.ipl_info.ccw.vm_parm_len;
		memcpy(ipb->ipl_info.ccw.vm_parm,
		       ipl_block.ipl_info.ccw.vm_parm, DIAG308_VMPARM_SIZE);
	}
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}

1006
static int __init reipl_nss_init(void)
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{
	int rc;

1010 1011
	if (!MACHINE_IS_VM)
		return 0;
1012 1013 1014 1015 1016 1017 1018 1019

	reipl_block_nss = (void *) get_zeroed_page(GFP_KERNEL);
	if (!reipl_block_nss)
		return -ENOMEM;

	if (!diag308_set_works)
		sys_reipl_nss_vmparm_attr.attr.mode = S_IRUGO;

1020
	rc = sysfs_create_group(&reipl_kset->kobj, &reipl_nss_attr_group);
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	if (rc)
		return rc;
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	reipl_block_ccw_init(reipl_block_nss);
	if (ipl_info.type == IPL_TYPE_NSS) {
		memset(reipl_block_nss->ipl_info.ccw.nss_name,
			' ', NSS_NAME_SIZE);
		memcpy(reipl_block_nss->ipl_info.ccw.nss_name,
			kernel_nss_name, strlen(kernel_nss_name));
		ASCEBC(reipl_block_nss->ipl_info.ccw.nss_name, NSS_NAME_SIZE);
		reipl_block_nss->ipl_info.ccw.vm_flags |=
			DIAG308_VM_FLAGS_NSS_VALID;

		reipl_block_ccw_fill_parms(reipl_block_nss);
	}

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	reipl_capabilities |= IPL_TYPE_NSS;
	return 0;
}

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static int __init reipl_ccw_init(void)
{
	int rc;

	reipl_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
	if (!reipl_block_ccw)
		return -ENOMEM;
1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058

	if (MACHINE_IS_VM) {
		if (!diag308_set_works)
			sys_reipl_ccw_vmparm_attr.attr.mode = S_IRUGO;
		rc = sysfs_create_group(&reipl_kset->kobj,
					&reipl_ccw_attr_group_vm);
	} else {
		if(!diag308_set_works)
			sys_reipl_ccw_loadparm_attr.attr.mode = S_IRUGO;
		rc = sysfs_create_group(&reipl_kset->kobj,
					&reipl_ccw_attr_group_lpar);
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	}
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	if (rc)
		return rc;

	reipl_block_ccw_init(reipl_block_ccw);
	if (ipl_info.type == IPL_TYPE_CCW) {
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		reipl_block_ccw->ipl_info.ccw.devno = ipl_devno;
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		reipl_block_ccw_fill_parms(reipl_block_ccw);
	}

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	reipl_capabilities |= IPL_TYPE_CCW;
	return 0;
}

static int __init reipl_fcp_init(void)
{
	int rc;

1077 1078 1079 1080 1081 1082
	if (!diag308_set_works) {
		if (ipl_info.type == IPL_TYPE_FCP)
			make_attrs_ro(reipl_fcp_attrs);
		else
			return 0;
	}
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	reipl_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
	if (!reipl_block_fcp)
		return -ENOMEM;
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	rc = sysfs_create_group(&reipl_kset->kobj, &reipl_fcp_attr_group);
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	if (rc) {
		free_page((unsigned long)reipl_block_fcp);
		return rc;
	}
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	if (ipl_info.type == IPL_TYPE_FCP) {
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		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;
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		reipl_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
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		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;
}

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static int __init reipl_init(void)
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{
	int rc;

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	reipl_kset = kset_create_and_add("reipl", NULL, firmware_kobj);
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	if (!reipl_kset)
		return -ENOMEM;
	rc = sysfs_create_file(&reipl_kset->kobj, &reipl_type_attr.attr);
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	if (rc) {
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		kset_unregister(reipl_kset);
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		return rc;
	}
	rc = reipl_ccw_init();
	if (rc)
		return rc;
	rc = reipl_fcp_init();
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	if (rc)
		return rc;
	rc = reipl_nss_init();
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	if (rc)
		return rc;
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	rc = reipl_set_type(ipl_info.type);
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	if (rc)
		return rc;
	return 0;
}

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static struct shutdown_action __refdata reipl_action = {
	.name	= SHUTDOWN_ACTION_REIPL_STR,
	.fn	= reipl_run,
	.init	= reipl_init,
};
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/*
 * dump shutdown action: Dump Linux on shutdown.
 */

/* 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 dump_type type)
{
	if (!(dump_capabilities & type))
		return -EINVAL;
	switch (type) {
	case DUMP_TYPE_CCW:
1192 1193 1194
		if (diag308_set_works)
			dump_method = DUMP_METHOD_CCW_DIAG;
		else if (MACHINE_IS_VM)
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			dump_method = DUMP_METHOD_CCW_VM;
		else
			dump_method = DUMP_METHOD_CCW_CIO;
		break;
	case DUMP_TYPE_FCP:
		dump_method = DUMP_METHOD_FCP_DIAG;
		break;
	default:
		dump_method = DUMP_METHOD_NONE;
	}
	dump_type = type;
	return 0;
}

static ssize_t dump_type_show(struct kobject *kobj,
			      struct kobj_attribute *attr, char *page)
{
	return sprintf(page, "%s\n", dump_type_str(dump_type));
}

static ssize_t dump_type_store(struct kobject *kobj,
			       struct kobj_attribute *attr,
			       const char *buf, size_t len)
{
	int rc = -EINVAL;

	if (strncmp(buf, DUMP_NONE_STR, strlen(DUMP_NONE_STR)) == 0)
		rc = dump_set_type(DUMP_TYPE_NONE);
	else if (strncmp(buf, DUMP_CCW_STR, strlen(DUMP_CCW_STR)) == 0)
		rc = dump_set_type(DUMP_TYPE_CCW);
	else if (strncmp(buf, DUMP_FCP_STR, strlen(DUMP_FCP_STR)) == 0)
		rc = dump_set_type(DUMP_TYPE_FCP);
	return (rc != 0) ? rc : len;
}

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

static struct kset *dump_kset;

static void dump_run(struct shutdown_trigger *trigger)
{
	struct ccw_dev_id devid;
	static char buf[100];

	switch (dump_method) {
	case DUMP_METHOD_CCW_CIO:
		smp_send_stop();
		devid.devno = dump_block_ccw->ipl_info.ccw.devno;
		devid.ssid  = 0;
		reipl_ccw_dev(&devid);
		break;
	case DUMP_METHOD_CCW_VM:
		smp_send_stop();
		sprintf(buf, "STORE STATUS");
		__cpcmd(buf, NULL, 0, NULL);
		sprintf(buf, "IPL %X", dump_block_ccw->ipl_info.ccw.devno);
		__cpcmd(buf, NULL, 0, NULL);
		break;
	case DUMP_METHOD_CCW_DIAG:
		diag308(DIAG308_SET, dump_block_ccw);
		diag308(DIAG308_DUMP, NULL);
		break;
	case DUMP_METHOD_FCP_DIAG:
		diag308(DIAG308_SET, dump_block_fcp);
		diag308(DIAG308_DUMP, NULL);
		break;
	case DUMP_METHOD_NONE:
		return;
	}
	printk(KERN_EMERG "Dump failed!\n");
}

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static int __init dump_ccw_init(void)
{
	int rc;

	dump_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
	if (!dump_block_ccw)
		return -ENOMEM;
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	rc = sysfs_create_group(&dump_kset->kobj, &dump_ccw_attr_group);
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	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;
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	dump_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
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	dump_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
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	dump_capabilities |= DUMP_TYPE_CCW;
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	return 0;
}

static int __init dump_fcp_init(void)
{
	int rc;

1292
	if (!sclp_ipl_info.has_dump)
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		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;
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	rc = sysfs_create_group(&dump_kset->kobj, &dump_fcp_attr_group);
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	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;
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	dump_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
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	dump_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
	dump_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_DUMP;
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	dump_capabilities |= DUMP_TYPE_FCP;
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	return 0;
}

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static int __init dump_init(void)
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{
	int rc;

1317
	dump_kset = kset_create_and_add("dump", NULL, firmware_kobj);
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	if (!dump_kset)
		return -ENOMEM;
1320
	rc = sysfs_create_file(&dump_kset->kobj, &dump_type_attr.attr);
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	if (rc) {
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		kset_unregister(dump_kset);
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		return rc;
	}
	rc = dump_ccw_init();
	if (rc)
		return rc;
	rc = dump_fcp_init();
	if (rc)
		return rc;
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	dump_set_type(DUMP_TYPE_NONE);
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	return 0;
}

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static struct shutdown_action __refdata dump_action = {
	.name	= SHUTDOWN_ACTION_DUMP_STR,
	.fn	= dump_run,
	.init	= dump_init,
};
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static void dump_reipl_run(struct shutdown_trigger *trigger)
{
	preempt_disable();
	/*
	 * Bypass dynamic address translation (DAT) when storing IPL parameter
	 * information block address and checksum into the prefix area
	 * (corresponding to absolute addresses 0-8191).
	 * When enhanced DAT applies and the STE format control in one,
	 * the absolute address is formed without prefixing. In this case a
	 * normal store (stg/st) into the prefix area would no more match to
	 * absolute addresses 0-8191.
	 */
#ifdef CONFIG_64BIT
	asm volatile("sturg %0,%1"
		:: "a" ((unsigned long) reipl_block_actual),
		"a" (&lowcore_ptr[smp_processor_id()]->ipib));
#else
	asm volatile("stura %0,%1"
		:: "a" ((unsigned long) reipl_block_actual),
		"a" (&lowcore_ptr[smp_processor_id()]->ipib));
#endif
	asm volatile("stura %0,%1"
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		:: "a" (csum_partial(reipl_block_actual,
				     reipl_block_actual->hdr.len, 0)),
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		"a" (&lowcore_ptr[smp_processor_id()]->ipib_checksum));
	preempt_enable();
	dump_run(trigger);
}

static int __init dump_reipl_init(void)
{
	if (!diag308_set_works)
		return -EOPNOTSUPP;
	else
		return 0;
}

static struct shutdown_action __refdata dump_reipl_action = {
	.name	= SHUTDOWN_ACTION_DUMP_REIPL_STR,
	.fn	= dump_reipl_run,
	.init	= dump_reipl_init,
};

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/*
 * vmcmd shutdown action: Trigger vm command on shutdown.
 */

static char vmcmd_on_reboot[128];
static char vmcmd_on_panic[128];
static char vmcmd_on_halt[128];
static char vmcmd_on_poff[128];

DEFINE_IPL_ATTR_STR_RW(vmcmd, on_reboot, "%s\n", "%s\n", vmcmd_on_reboot);
DEFINE_IPL_ATTR_STR_RW(vmcmd, on_panic, "%s\n", "%s\n", vmcmd_on_panic);
DEFINE_IPL_ATTR_STR_RW(vmcmd, on_halt, "%s\n", "%s\n", vmcmd_on_halt);
DEFINE_IPL_ATTR_STR_RW(vmcmd, on_poff, "%s\n", "%s\n", vmcmd_on_poff);

static struct attribute *vmcmd_attrs[] = {
	&sys_vmcmd_on_reboot_attr.attr,
	&sys_vmcmd_on_panic_attr.attr,
	&sys_vmcmd_on_halt_attr.attr,
	&sys_vmcmd_on_poff_attr.attr,
	NULL,
};

static struct attribute_group vmcmd_attr_group = {
	.attrs = vmcmd_attrs,
};

static struct kset *vmcmd_kset;

static void vmcmd_run(struct shutdown_trigger *trigger)
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{
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	char *cmd, *next_cmd;

	if (strcmp(trigger->name, ON_REIPL_STR) == 0)
		cmd = vmcmd_on_reboot;
	else if (strcmp(trigger->name, ON_PANIC_STR) == 0)
		cmd = vmcmd_on_panic;
	else if (strcmp(trigger->name, ON_HALT_STR) == 0)
		cmd = vmcmd_on_halt;
	else if (strcmp(trigger->name, ON_POFF_STR) == 0)
		cmd = vmcmd_on_poff;
	else
		return;

	if (strlen(cmd) == 0)
		return;
	do {
		next_cmd = strchr(cmd, '\n');
		if (next_cmd) {
			next_cmd[0] = 0;
			next_cmd += 1;
		}
		__cpcmd(cmd, NULL, 0, NULL);
		cmd = next_cmd;
	} while (cmd != NULL);
}

static int vmcmd_init(void)
{
	if (!MACHINE_IS_VM)
		return -ENOTSUPP;
	vmcmd_kset = kset_create_and_add("vmcmd", NULL, firmware_kobj);
	if (!vmcmd_kset)
		return -ENOMEM;
	return sysfs_create_group(&vmcmd_kset->kobj, &vmcmd_attr_group);
}

static struct shutdown_action vmcmd_action = {SHUTDOWN_ACTION_VMCMD_STR,
					      vmcmd_run, vmcmd_init};

/*
 * stop shutdown action: Stop Linux on shutdown.
 */

static void stop_run(struct shutdown_trigger *trigger)
{
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	if (strcmp(trigger->name, ON_PANIC_STR) == 0)
		disabled_wait((unsigned long) __builtin_return_address(0));
	else {
		signal_processor(smp_processor_id(), sigp_stop);
		for (;;);
	}
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}

static struct shutdown_action stop_action = {SHUTDOWN_ACTION_STOP_STR,
					     stop_run, NULL};

/* action list */

static struct shutdown_action *shutdown_actions_list[] = {
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	&ipl_action, &reipl_action, &dump_reipl_action, &dump_action,
	&vmcmd_action, &stop_action};
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#define SHUTDOWN_ACTIONS_COUNT (sizeof(shutdown_actions_list) / sizeof(void *))

/*
 * Trigger section
 */

static struct kset *shutdown_actions_kset;

static int set_trigger(const char *buf, struct shutdown_trigger *trigger,
		       size_t len)
{
	int i;
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	for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
		if (!shutdown_actions_list[i])
			continue;
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		if (sysfs_streq(buf, shutdown_actions_list[i]->name)) {
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			trigger->action = shutdown_actions_list[i];
			return len;
		}
	}
	return -EINVAL;
}

/* on reipl */

static struct shutdown_trigger on_reboot_trigger = {ON_REIPL_STR,
						    &reipl_action};

static ssize_t on_reboot_show(struct kobject *kobj,
			      struct kobj_attribute *attr, char *page)
{
	return sprintf(page, "%s\n", on_reboot_trigger.action->name);
}

static ssize_t on_reboot_store(struct kobject *kobj,
			       struct kobj_attribute *attr,
			       const char *buf, size_t len)
{
	return set_trigger(buf, &on_reboot_trigger, len);
}

static struct kobj_attribute on_reboot_attr =
	__ATTR(on_reboot, 0644, on_reboot_show, on_reboot_store);

static void do_machine_restart(char *__unused)
{
	smp_send_stop();
	on_reboot_trigger.action->fn(&on_reboot_trigger);
	reipl_run(NULL);
}
void (*_machine_restart)(char *command) = do_machine_restart;

/* on panic */

static struct shutdown_trigger on_panic_trigger = {ON_PANIC_STR, &stop_action};

static ssize_t on_panic_show(struct kobject *kobj,
			     struct kobj_attribute *attr, char *page)
{
	return sprintf(page, "%s\n", on_panic_trigger.action->name);
}

static ssize_t on_panic_store(struct kobject *kobj,
			      struct kobj_attribute *attr,
			      const char *buf, size_t len)
{
	return set_trigger(buf, &on_panic_trigger, len);
}

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

static void do_panic(void)
{
	on_panic_trigger.action->fn(&on_panic_trigger);
	stop_run(&on_panic_trigger);
}

/* on halt */

static struct shutdown_trigger on_halt_trigger = {ON_HALT_STR, &stop_action};

static ssize_t on_halt_show(struct kobject *kobj,
			    struct kobj_attribute *attr, char *page)
{
	return sprintf(page, "%s\n", on_halt_trigger.action->name);
}

static ssize_t on_halt_store(struct kobject *kobj,
			     struct kobj_attribute *attr,
			     const char *buf, size_t len)
{
	return set_trigger(buf, &on_halt_trigger, len);
}

static struct kobj_attribute on_halt_attr =
	__ATTR(on_halt, 0644, on_halt_show, on_halt_store);
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static void do_machine_halt(void)
{
	smp_send_stop();
	on_halt_trigger.action->fn(&on_halt_trigger);
	stop_run(&on_halt_trigger);
}
void (*_machine_halt)(void) = do_machine_halt;

/* on power off */

static struct shutdown_trigger on_poff_trigger = {ON_POFF_STR, &stop_action};

static ssize_t on_poff_show(struct kobject *kobj,
			    struct kobj_attribute *attr, char *page)
{
	return sprintf(page, "%s\n", on_poff_trigger.action->name);
}

static ssize_t on_poff_store(struct kobject *kobj,
			     struct kobj_attribute *attr,
			     const char *buf, size_t len)
{
	return set_trigger(buf, &on_poff_trigger, len);
}

static struct kobj_attribute on_poff_attr =
	__ATTR(on_poff, 0644, on_poff_show, on_poff_store);


static void do_machine_power_off(void)
{
	smp_send_stop();
	on_poff_trigger.action->fn(&on_poff_trigger);
	stop_run(&on_poff_trigger);
}
void (*_machine_power_off)(void) = do_machine_power_off;

static void __init shutdown_triggers_init(void)
{
1614
	shutdown_actions_kset = kset_create_and_add("shutdown_actions", NULL,
1615
						    firmware_kobj);
1616
	if (!shutdown_actions_kset)
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		goto fail;
	if (sysfs_create_file(&shutdown_actions_kset->kobj,
			      &on_reboot_attr.attr))
		goto fail;
	if (sysfs_create_file(&shutdown_actions_kset->kobj,
			      &on_panic_attr.attr))
		goto fail;
	if (sysfs_create_file(&shutdown_actions_kset->kobj,
			      &on_halt_attr.attr))
		goto fail;
	if (sysfs_create_file(&shutdown_actions_kset->kobj,
			      &on_poff_attr.attr))
		goto fail;

	return;
fail:
	panic("shutdown_triggers_init failed\n");
}

static void __init shutdown_actions_init(void)
{
	int i;

	for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
		if (!shutdown_actions_list[i]->init)
			continue;
		if (shutdown_actions_list[i]->init())
			shutdown_actions_list[i] = NULL;
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	}
}

static int __init s390_ipl_init(void)
{
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	sclp_get_ipl_info(&sclp_ipl_info);
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	shutdown_actions_init();
	shutdown_triggers_init();
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	return 0;
}

__initcall(s390_ipl_init);
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static void __init strncpy_skip_quote(char *dst, char *src, int n)
{
	int sx, dx;

	dx = 0;
	for (sx = 0; src[sx] != 0; sx++) {
		if (src[sx] == '"')
			continue;
		dst[dx++] = src[sx];
		if (dx >= n)
			break;
	}
}

static int __init vmcmd_on_reboot_setup(char *str)
{
	if (!MACHINE_IS_VM)
		return 1;
	strncpy_skip_quote(vmcmd_on_reboot, str, 127);
	vmcmd_on_reboot[127] = 0;
	on_reboot_trigger.action = &vmcmd_action;
	return 1;
}
__setup("vmreboot=", vmcmd_on_reboot_setup);

static int __init vmcmd_on_panic_setup(char *str)
{
	if (!MACHINE_IS_VM)
		return 1;
	strncpy_skip_quote(vmcmd_on_panic, str, 127);
	vmcmd_on_panic[127] = 0;
	on_panic_trigger.action = &vmcmd_action;
	return 1;
}
__setup("vmpanic=", vmcmd_on_panic_setup);

static int __init vmcmd_on_halt_setup(char *str)
{
	if (!MACHINE_IS_VM)
		return 1;
	strncpy_skip_quote(vmcmd_on_halt, str, 127);
	vmcmd_on_halt[127] = 0;
	on_halt_trigger.action = &vmcmd_action;
	return 1;
}
__setup("vmhalt=", vmcmd_on_halt_setup);

static int __init vmcmd_on_poff_setup(char *str)
{
	if (!MACHINE_IS_VM)
		return 1;
	strncpy_skip_quote(vmcmd_on_poff, str, 127);
	vmcmd_on_poff[127] = 0;
	on_poff_trigger.action = &vmcmd_action;
	return 1;
}
__setup("vmpoff=", vmcmd_on_poff_setup);

static int on_panic_notify(struct notifier_block *self,
			   unsigned long event, void *data)
{
	do_panic();
	return NOTIFY_OK;
}

static struct notifier_block on_panic_nb = {
	.notifier_call = on_panic_notify,
1725
	.priority = INT_MIN,
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};

void __init setup_ipl(void)
{
	ipl_info.type = get_ipl_type();
	switch (ipl_info.type) {
	case IPL_TYPE_CCW:
		ipl_info.data.ccw.dev_id.devno = ipl_devno;
		ipl_info.data.ccw.dev_id.ssid = 0;
		break;
	case IPL_TYPE_FCP:
	case IPL_TYPE_FCP_DUMP:
		ipl_info.data.fcp.dev_id.devno =
			IPL_PARMBLOCK_START->ipl_info.fcp.devno;
		ipl_info.data.fcp.dev_id.ssid = 0;
		ipl_info.data.fcp.wwpn = IPL_PARMBLOCK_START->ipl_info.fcp.wwpn;
		ipl_info.data.fcp.lun = IPL_PARMBLOCK_START->ipl_info.fcp.lun;
		break;
	case IPL_TYPE_NSS:
		strncpy(ipl_info.data.nss.name, kernel_nss_name,
			sizeof(ipl_info.data.nss.name));
		break;
	case IPL_TYPE_UNKNOWN:
		/* We have no info to copy */
		break;
	}
	atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
}

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void __init ipl_update_parameters(void)
{
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	int rc;

	rc = diag308(DIAG308_STORE, &ipl_block);
	if ((rc == DIAG308_RC_OK) || (rc == DIAG308_RC_NOCONFIG))
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		diag308_set_works = 1;
}

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void __init ipl_save_parameters(void)
{
	struct cio_iplinfo iplinfo;
	unsigned int *ipl_ptr;
	void *src, *dst;

	if (cio_get_iplinfo(&iplinfo))
		return;

	ipl_devno = iplinfo.devno;
	ipl_flags |= IPL_DEVNO_VALID;
	if (!iplinfo.is_qdio)
		return;
	ipl_flags |= IPL_PARMBLOCK_VALID;
	ipl_ptr = (unsigned int *)__LC_IPL_PARMBLOCK_PTR;
	src = (void *)(unsigned long)*ipl_ptr;
	dst = (void *)IPL_PARMBLOCK_ORIGIN;
	memmove(dst, src, PAGE_SIZE);
	*ipl_ptr = IPL_PARMBLOCK_ORIGIN;
}

1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811
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();
}

1812
u32 dump_prefix_page;
1813 1814 1815 1816 1817 1818

void s390_reset_system(void)
{
	struct _lowcore *lc;

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

1823
	/* Save prefix page address for dump case */
1824
	dump_prefix_page = (u32)(unsigned long) lc;
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	/* Disable prefixing */
	set_prefix(0);

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

	/* Set new machine check handler */
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	S390_lowcore.mcck_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
1834
	S390_lowcore.mcck_new_psw.addr =
1835
		PSW_ADDR_AMODE | (unsigned long) s390_base_mcck_handler;
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	/* Set new program check handler */
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	S390_lowcore.program_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
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	S390_lowcore.program_new_psw.addr =
1840
		PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
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1842 1843
	do_reset_calls();
}
1844