ipl.c

linux 内核源代码

/*
 * 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 dump_type type)
{
	if (!(dump_capabilities & type))
		return -EINVAL;
	switch(type) {
	case DUMP_TYPE_CCW:
		if (MACHINE_IS_VM)
			dump_method = DUMP_METHOD_CCW_VM;
		else if (diag308_set_works)
			dump_method = DUMP_METHOD_CCW_DIAG;
		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 kset *kset, char *page)
{
	return sprintf(page, "%s\n", dump_type_str(dump_type));
}

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

static decl_subsys(dump, NULL, NULL);

/*
 * Shutdown actions section
 */

static decl_subsys(shutdown_actions, NULL, NULL);

/* on panic */

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

static ssize_t on_panic_store(struct kset *kset, 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);

void do_reipl(void)
{
	struct ccw_dev_id devid;
	static char buf[100];
	char loadparm[LOADPARM_LEN + 1];

	switch (reipl_method) {
	case REIPL_METHOD_CCW_CIO:
		devid.devno = reipl_block_ccw->ipl_info.ccw.devno;
		if (ipl_info.type == IPL_TYPE_CCW && devid.devno == ipl_devno)
			diag308(DIAG308_IPL, NULL);
		devid.ssid  = 0;
		reipl_ccw_dev(&devid);
		break;
	case REIPL_METHOD_CCW_VM:
		reipl_get_ascii_loadparm(loadparm);
		if (strlen(loadparm) == 0)
			sprintf(buf, "IPL %X CLEAR",
				reipl_block_ccw->ipl_info.ccw.devno);
		else
			sprintf(buf, "IPL %X CLEAR LOADPARM '%s'",
				reipl_block_ccw->ipl_info.ccw.devno, loadparm);
		__cpcmd(buf, NULL, 0, NULL);
		break;
	case REIPL_METHOD_CCW_DIAG:
		diag308(DIAG308_SET, reipl_block_ccw);
		diag308(DIAG308_IPL, NULL);
		break;
	case REIPL_METHOD_FCP_RW_DIAG:
		diag308(DIAG308_SET, reipl_block_fcp);
		diag308(DIAG308_IPL, NULL);
		break;
	case REIPL_METHOD_FCP_RO_DIAG:
		diag308(DIAG308_IPL, NULL);
		break;
	case REIPL_METHOD_FCP_RO_VM:
		__cpcmd("IPL", NULL, 0, NULL);
		break;
	case REIPL_METHOD_NSS:
		sprintf(buf, "IPL %s", reipl_nss_name);
		__cpcmd(buf, NULL, 0, NULL);
		break;
	case REIPL_METHOD_DEFAULT:
		if (MACHINE_IS_VM)
			__cpcmd("IPL", NULL, 0, NULL);
		diag308(DIAG308_IPL, NULL);
		break;
	case REIPL_METHOD_FCP_DUMP:
	default:
		break;
	}
	signal_processor(smp_processor_id(), sigp_stop_and_store_status);
}

static void do_dump(void)
{
	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:
	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.kobj,
				&ipl_fcp_attr_group);
	if (rc)
		goto out;
	rc = sysfs_create_bin_file(&ipl_subsys.kobj,
				   &ipl_parameter_attr);
	if (rc)
		goto out_ipl_parm;
	rc = sysfs_create_bin_file(&ipl_subsys.kobj,
				   &ipl_scp_data_attr);
	if (!rc)
		goto out;

	sysfs_remove_bin_file(&ipl_subsys.kobj, &ipl_parameter_attr);

out_ipl_parm:
	sysfs_remove_group(&ipl_subsys.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_info.type) {
	case IPL_TYPE_CCW:
		rc = sysfs_create_group(&ipl_subsys.kobj,
					&ipl_ccw_attr_group);
		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_subsys.kobj,
					&ipl_nss_attr_group);
		break;
	default:
		rc = sysfs_create_group(&ipl_subsys.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_nss_init(void)
{
	int rc;

	if (!MACHINE_IS_VM)
		return 0;
	rc = sysfs_create_group(&reipl_subsys.kobj, &reipl_nss_attr_group);
	if (rc)
		return rc;
	strncpy(reipl_nss_name, kernel_nss_name, NSS_NAME_SIZE + 1);
	reipl_capabilities |= IPL_TYPE_NSS;
	return 0;
}

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.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 = IPL_PARM_BLK0_CCW_LEN;
	reipl_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
	/* check if read scp info worked and set loadparm */
	if (sclp_ipl_info.is_valid)
		memcpy(reipl_block_ccw->ipl_info.ccw.load_param,
		       &sclp_ipl_info.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;
	if (ipl_info.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_info.type != IPL_TYPE_FCP))
		return 0;
	if ((!diag308_set_works) && (ipl_info.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.kobj, &reipl_fcp_attr_group);
	if (rc) {
		free_page((unsigned long)reipl_block_fcp);
		return rc;
	}
	if (ipl_info.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 = IPL_PARM_BLK0_FCP_LEN;
		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_nss_init();
	if (rc)
		return rc;
	rc = reipl_set_type(ipl_info.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.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 = IPL_PARM_BLK0_CCW_LEN;
	dump_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
	dump_capabilities |= DUMP_TYPE_CCW;
	return 0;
}

static int __init dump_fcp_init(void)
{
	int rc;

	if (!sclp_ipl_info.has_dump)
		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.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 = IPL_PARM_BLK0_FCP_LEN;
	dump_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
	dump_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_DUMP;
	dump_capabilities |= DUMP_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(DUMP_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;

	sclp_get_ipl_info(&sclp_ipl_info);
	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);

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;
}

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();
}

u32 dump_prefix_page;

void s390_reset_system(void)
{
	struct _lowcore *lc;

	lc = (struct _lowcore *)(unsigned long) store_prefix();

	/* Stack for interrupt/machine check handler */
	lc->panic_stack = S390_lowcore.panic_stack;

	/* Save prefix page address for dump case */
	dump_prefix_page = (u32)(unsigned long) lc;

	/* 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) s390_base_mcck_handler;

	/* Set new program check handler */
	S390_lowcore.program_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
	S390_lowcore.program_new_psw.addr =
		PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;

	do_reset_calls();
}