ipl.c

linux 内核源代码

/*
 *  arch/s390/kernel/ipl.c
 *    ipl/reipl/dump support for Linux on s390.
 *
 *    Copyright (C) IBM Corp. 2005,2006
 *    Author(s): Michael Holzheu <[e-mail]>
 *		 Heiko Carstens <[e-mail]>
 *		 Volker Sameske <[e-mail]>
 */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/reboot.h>
#include <linux/ctype.h>
#include <asm/ipl.h>
#include <asm/smp.h>
#include <asm/setup.h>
#include <asm/cpcmd.h>
#include <asm/cio.h>
#include <asm/ebcdic.h>
#include <asm/reset.h>
#include <asm/sclp.h>

#define IPL_PARM_BLOCK_VERSION 0

#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"

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;
	case IPL_TYPE_FCP_DUMP:
		return IPL_FCP_DUMP_STR;
	case IPL_TYPE_NSS:
		return IPL_NSS_STR;
	case IPL_TYPE_UNKNOWN:
	default:
		return IPL_UNKNOWN_STR;
	}
}

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

#define DUMP_NONE_STR	 "none"
#define DUMP_CCW_STR	 "ccw"
#define DUMP_FCP_STR	 "fcp"

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;

enum ipl_method {
	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,
	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,
};

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:
		return NULL;
	}
}

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 = REIPL_METHOD_DEFAULT;
static struct ipl_parameter_block *reipl_block_fcp;
static struct ipl_parameter_block *reipl_block_ccw;

static char reipl_nss_name[NSS_NAME_SIZE + 1];

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;
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 struct sclp_ipl_info sclp_ipl_info;

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

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

/* SYSFS */

#define DEFINE_IPL_ATTR_RO(_prefix, _name, _format, _value)		\
static ssize_t sys_##_prefix##_##_name##_show(struct kset *kset,	\
		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 kset *kset,	\
		char *page)						\
{									\
	return sprintf(page, _fmt_out,					\
			(unsigned long long) _value);			\
}									\
static ssize_t sys_##_prefix##_##_name##_store(struct kset *kset,	\
		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);

#define DEFINE_IPL_ATTR_STR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)\
static ssize_t sys_##_prefix##_##_name##_show(struct kset *kset,	\
		char *page)						\
{									\
	return sprintf(page, _fmt_out, _value);				\
}									\
static ssize_t sys_##_prefix##_##_name##_store(struct kset *kset,	\
		const char *buf, size_t len)				\
{									\
	if (sscanf(buf, _fmt_in, _value) != 1)				\
		return -EINVAL;						\
	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 __init enum ipl_type get_ipl_type(void)
{
	struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;

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

void __init setup_ipl_info(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:
	default:
		/* We have no info to copy */
		break;
	}
}

struct ipl_info ipl_info;
EXPORT_SYMBOL_GPL(ipl_info);

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

static struct subsys_attribute sys_ipl_type_attr = __ATTR_RO(ipl_type);

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

	switch (ipl_info.type) {
	case IPL_TYPE_CCW:
		return sprintf(page, "0.0.%04x\n", ipl_devno);
	case IPL_TYPE_FCP:
	case IPL_TYPE_FCP_DUMP:
		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, struct bin_attribute *attr,
				  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,
	},
	.size = PAGE_SIZE,
	.read = &ipl_parameter_read,
};

static ssize_t ipl_scp_data_read(struct kobject *kobj, struct bin_attribute *attr,
				 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,
	},
	.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 */

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

	if (!sclp_ipl_info.is_valid)
		return sprintf(page, "#unknown#\n");
	memcpy(loadparm, &sclp_ipl_info.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);

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

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

/* 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,
	NULL,
};

static struct attribute_group ipl_nss_attr_group = {
	.attrs = ipl_nss_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);

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 kset *kset, 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 kset *kset,
					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);

static struct attribute *reipl_ccw_attrs[] = {
	&sys_reipl_ccw_device_attr.attr,
	&sys_reipl_ccw_loadparm_attr.attr,
	NULL,
};

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


/* NSS reipl device attributes */

DEFINE_IPL_ATTR_STR_RW(reipl_nss, name, "%s\n", "%s\n", reipl_nss_name);

static struct attribute *reipl_nss_attrs[] = {
	&sys_reipl_nss_name_attr.attr,
	NULL,
};

static struct attribute_group reipl_nss_attr_group = {
	.name  = IPL_NSS_STR,
	.attrs = reipl_nss_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 = REIPL_METHOD_CCW_VM;
		else
			reipl_method = REIPL_METHOD_CCW_CIO;
		break;
	case IPL_TYPE_FCP:
		if (diag308_set_works)
			reipl_method = REIPL_METHOD_FCP_RW_DIAG;
		else if (MACHINE_IS_VM)
			reipl_method = REIPL_METHOD_FCP_RO_VM;
		else
			reipl_method = REIPL_METHOD_FCP_RO_DIAG;
		break;
	case IPL_TYPE_FCP_DUMP:
		reipl_method = REIPL_METHOD_FCP_DUMP;
		break;
	case IPL_TYPE_NSS:
		reipl_method = REIPL_METHOD_NSS;
		break;
	case IPL_TYPE_UNKNOWN:
		reipl_method = REIPL_METHOD_DEFAULT;
		break;
	default:
		BUG();
	}
	reipl_type = type;
	return 0;
}

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

static ssize_t reipl_type_store(struct kset *kset, 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);
	else if (strncmp(buf, IPL_NSS_STR, strlen(IPL_NSS_STR)) == 0)
		rc = reipl_set_type(IPL_TYPE_NSS);
	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);