ipl.c

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/*
 *    ipl/reipl/dump support for Linux on s390.
 *
 *    Copyright IBM Corp. 2005, 2012
 *    Author(s): Michael Holzheu <[email protected]>
 *       Heiko Carstens <[email protected]>
 *       Volker Sameske <[email protected]>
 */

#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 <linux/fs.h>
#include <linux/gfp.h>
#include <linux/crash_dump.h>
#include <linux/debug_locks.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>
#include <asm/checksum.h>
#include <asm/debug.h>
#include <asm/os_info.h>
#include "entry.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"

#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
 * - restart
 */
#define ON_PANIC_STR        "on_panic"
#define ON_HALT_STR     "on_halt"
#define ON_POFF_STR     "on_poff"
#define ON_REIPL_STR        "on_reboot"
#define ON_RESTART_STR      "on_restart"

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

/*
 * The following shutdown action types are supported:
 */
#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"
#define SHUTDOWN_ACTION_DUMP_REIPL_STR  "dump_reipl"

struct shutdown_action {
    char *name;
    void (*fn) (struct shutdown_trigger *trigger);
    int (*init) (void);
    int init_rc;
};

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,
};

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_NSS_DIAG,
    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,
};

static int diag308_set_works = 0;

static struct ipl_parameter_block ipl_block;

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 struct ipl_parameter_block *reipl_block_nss;
static struct ipl_parameter_block *reipl_block_actual;

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 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 kobject *kobj, \
        struct kobj_attribute *attr,                \
        char *page)                     \
{                                   \
    return sprintf(page, _format, _value);              \
}                                   \
static struct kobj_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 kobject *kobj, \
        struct kobj_attribute *attr,                \
        char *page)                     \
{                                   \
    return sprintf(page, _fmt_out,                  \
            (unsigned long long) _value);           \
}                                   \
static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,    \
        struct kobj_attribute *attr,                \
        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 kobj_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 kobject *kobj, \
        struct kobj_attribute *attr,                \
        char *page)                     \
{                                   \
    return sprintf(page, _fmt_out, _value);             \
}                                   \
static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,    \
        struct kobj_attribute *attr,                \
        const char *buf, size_t len)                \
{                                   \
    strncpy(_value, buf, sizeof(_value) - 1);           \
    strim(_value);                          \
    return len;                         \
}                                   \
static struct kobj_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;
}

struct ipl_info ipl_info;
EXPORT_SYMBOL_GPL(ipl_info);

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

static struct kobj_attribute sys_ipl_type_attr = __ATTR_RO(ipl_type);

/* VM IPL PARM routines */
static size_t reipl_get_ascii_vmparm(char *dest, size_t size,
                     const struct ipl_parameter_block *ipb)
{
    int i;
    size_t len;
    char has_lowercase = 0;

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

        len = min_t(size_t, size - 1, 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;

    return len;
}

size_t append_ipl_vmparm(char *dest, size_t size)
{
    size_t rc;

    rc = 0;
    if (diag308_set_works && (ipl_block.hdr.pbt == DIAG308_IPL_TYPE_CCW))
        rc = reipl_get_ascii_vmparm(dest, size, &ipl_block);
    else
        dest[0] = 0;
    return rc;
}

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

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

static size_t scpdata_length(const char* buf, size_t count)
{
    while (count) {
        if (buf[count - 1] != '\0' && buf[count - 1] != ' ')
            break;
        count--;
    }
    return count;
}

static size_t reipl_append_ascii_scpdata(char *dest, size_t size,
                     const struct ipl_parameter_block *ipb)
{
    size_t count;
    size_t i;
    int has_lowercase;

    count = min(size - 1, scpdata_length(ipb->ipl_info.fcp.scp_data,
                         ipb->ipl_info.fcp.scp_data_len));
    if (!count)
        goto out;

    has_lowercase = 0;
    for (i = 0; i < count; i++) {
        if (!isascii(ipb->ipl_info.fcp.scp_data[i])) {
            count = 0;
            goto out;
        }
        if (!has_lowercase && islower(ipb->ipl_info.fcp.scp_data[i]))
            has_lowercase = 1;
    }

    if (has_lowercase)
        memcpy(dest, ipb->ipl_info.fcp.scp_data, count);
    else
        for (i = 0; i < count; i++)
            dest[i] = tolower(ipb->ipl_info.fcp.scp_data[i]);
out:
    dest[count] = '\0';
    return count;
}

size_t append_ipl_scpdata(char *dest, size_t len)
{
    size_t rc;

    rc = 0;
    if (ipl_block.hdr.pbt == DIAG308_IPL_TYPE_FCP)
        rc = reipl_append_ascii_scpdata(dest, len, &ipl_block);
    else
        dest[0] = 0;
    return rc;
}


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

static ssize_t sys_ipl_device_show(struct kobject *kobj,
                   struct kobj_attribute *attr, 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 kobj_attribute sys_ipl_device_attr =
    __ATTR(device, S_IRUGO, sys_ipl_device_show, NULL);

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

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 file *filp, 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;

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

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 kobject *kobj,
                     struct kobj_attribute *attr, 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);
    strim(loadparm);
    return sprintf(page, "%s\n", loadparm);
}

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

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[] = {
    &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_vm = {
    .attrs = ipl_ccw_attrs_vm,
};

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

/* 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,
    &sys_ipl_ccw_loadparm_attr.attr,
    &sys_ipl_vm_parm_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 struct kset *ipl_kset;

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(void *unused)
{
    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);
}

static void ipl_run(struct shutdown_trigger *trigger)
{
    smp_call_ipl_cpu(__ipl_run, NULL);
}

static int __init ipl_init(void)
{
    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:
        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);
        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;
}

static struct shutdown_action __refdata ipl_action = {
    .name   = SHUTDOWN_ACTION_IPL_STR,
    .fn = ipl_run,
    .init   = ipl_init,
};

/*
 * reipl shutdown action: Reboot Linux on shutdown.
 */

/* 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, sizeof(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);

/* FCP reipl device attributes */

static ssize_t reipl_fcp_scpdata_read(struct file *filp, struct kobject *kobj,
                      struct bin_attribute *attr,
                      char *buf, loff_t off, size_t count)
{
    size_t size = reipl_block_fcp->ipl_info.fcp.scp_data_len;
    void *scp_data = reipl_block_fcp->ipl_info.fcp.scp_data;

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

static ssize_t reipl_fcp_scpdata_write(struct file *filp, struct kobject *kobj,
                       struct bin_attribute *attr,
                       char *buf, loff_t off, size_t count)
{
    size_t padding;
    size_t scpdata_len;

    if (off < 0)
        return -EINVAL;

    if (off >= DIAG308_SCPDATA_SIZE)
        return -ENOSPC;

    if (count > DIAG308_SCPDATA_SIZE - off)
        count = DIAG308_SCPDATA_SIZE - off;

    memcpy(reipl_block_fcp->ipl_info.fcp.scp_data, buf + off, count);
    scpdata_len = off + count;

    if (scpdata_len % 8) {
        padding = 8 - (scpdata_len % 8);
        memset(reipl_block_fcp->ipl_info.fcp.scp_data + scpdata_len,
               0, padding);
        scpdata_len += padding;
    }

    reipl_block_fcp->ipl_info.fcp.scp_data_len = scpdata_len;
    reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN + scpdata_len;
    reipl_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN + scpdata_len;

    return count;
}

static struct bin_attribute sys_reipl_fcp_scp_data_attr = {
    .attr = {
        .name = "scp_data",
        .mode = S_IRUGO | S_IWUSR,
    },
    .size = PAGE_SIZE,
    .read = reipl_fcp_scpdata_read,
    .write = reipl_fcp_scpdata_write,
};

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 = {
    .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,
                     struct ipl_parameter_block *ibp)
{
    memcpy(loadparm, ibp->ipl_info.ccw.load_parm, LOADPARM_LEN);
    EBCASC(loadparm, LOADPARM_LEN);
    loadparm[LOADPARM_LEN] = 0;
    strim(loadparm);
}

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

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

static ssize_t reipl_generic_loadparm_store(struct ipl_parameter_block *ipb,
                        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(ipb->ipl_info.ccw.load_parm, ' ', LOADPARM_LEN);
    /* copy and convert to ebcdic */
    memcpy(ipb->ipl_info.ccw.load_parm, buf, lp_len);
    ASCEBC(ipb->ipl_info.ccw.load_parm, LOADPARM_LEN);
    return len;
}

/* 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);
}

static struct kobj_attribute sys_reipl_ccw_loadparm_attr =
    __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,
};

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

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

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


/* NSS reipl device attributes */
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--;

    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);

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

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

static void set_reipl_block_actual(struct ipl_parameter_block *reipl_block)
{
    reipl_block_actual = reipl_block;
    os_info_entry_add(OS_INFO_REIPL_BLOCK, reipl_block_actual,
              reipl_block->hdr.len);
}

/* reipl type */

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

    switch(type) {
    case IPL_TYPE_CCW:
        if (diag308_set_works)
            reipl_method = REIPL_METHOD_CCW_DIAG;
        else if (MACHINE_IS_VM)
            reipl_method = REIPL_METHOD_CCW_VM;
        else
            reipl_method = REIPL_METHOD_CCW_CIO;
        set_reipl_block_actual(reipl_block_ccw);
        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;
        set_reipl_block_actual(reipl_block_fcp);
        break;
    case IPL_TYPE_FCP_DUMP:
        reipl_method = REIPL_METHOD_FCP_DUMP;
        break;
    case IPL_TYPE_NSS:
        if (diag308_set_works)
            reipl_method = REIPL_METHOD_NSS_DIAG;
        else
            reipl_method = REIPL_METHOD_NSS;
        set_reipl_block_actual(reipl_block_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 kobject *kobj,
                   struct kobj_attribute *attr, char *page)
{
    return sprintf(page, "%s\n", ipl_type_str(reipl_type));
}

static ssize_t reipl_type_store(struct kobject *kobj,
                struct kobj_attribute *attr,
                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 kobj_attribute reipl_type_attr =
    __ATTR(reipl_type, 0644, reipl_type_show, reipl_type_store);

static struct kset *reipl_kset;
static struct kset *reipl_fcp_kset;

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, sizeof(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);
}

static void __reipl_run(void *unused)
{
    struct ccw_dev_id devid;
    static char buf[128];

    switch (reipl_method) {
    case REIPL_METHOD_CCW_CIO:
        devid.devno = reipl_block_ccw->ipl_info.ccw.devno;
        devid.ssid  = 0;
        reipl_ccw_dev(&devid);
        break;
    case REIPL_METHOD_CCW_VM:
        get_ipl_string(buf, reipl_block_ccw, REIPL_METHOD_CCW_VM);
        __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_DIAG:
        diag308(DIAG308_SET, reipl_block_nss);
        diag308(DIAG308_IPL, NULL);
        break;
    case REIPL_METHOD_NSS:
        get_ipl_string(buf, reipl_block_nss, REIPL_METHOD_NSS);
        __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:
        break;
    }
    disabled_wait((unsigned long) __builtin_return_address(0));
}

static void reipl_run(struct shutdown_trigger *trigger)
{
    smp_call_ipl_cpu(__reipl_run, NULL);
}

static void reipl_block_ccw_init(struct ipl_parameter_block *ipb)
{
    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;
}

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);
    }
}

static int __init reipl_nss_init(void)
{
    int rc;

    if (!MACHINE_IS_VM)
        return 0;

    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;

    rc = sysfs_create_group(&reipl_kset->kobj, &reipl_nss_attr_group);
    if (rc)
        return rc;

    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);
    }

    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;

    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);
    }
    if (rc)
        return rc;

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

    reipl_capabilities |= IPL_TYPE_CCW;
    return 0;
}

static int __init reipl_fcp_init(void)
{
    int rc;

    if (!diag308_set_works) {
        if (ipl_info.type == IPL_TYPE_FCP) {
            make_attrs_ro(reipl_fcp_attrs);
            sys_reipl_fcp_scp_data_attr.attr.mode = S_IRUGO;
        } else
            return 0;
    }

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

    /* sysfs: create fcp kset for mixing attr group and bin attrs */
    reipl_fcp_kset = kset_create_and_add(IPL_FCP_STR, NULL,
                         &reipl_kset->kobj);
    if (!reipl_fcp_kset) {
        free_page((unsigned long) reipl_block_fcp);
        return -ENOMEM;
    }

    rc = sysfs_create_group(&reipl_fcp_kset->kobj, &reipl_fcp_attr_group);
    if (rc) {
        kset_unregister(reipl_fcp_kset);
        free_page((unsigned long) reipl_block_fcp);
        return rc;
    }

    rc = sysfs_create_bin_file(&reipl_fcp_kset->kobj,
                   &sys_reipl_fcp_scp_data_attr);
    if (rc) {
        sysfs_remove_group(&reipl_fcp_kset->kobj, &reipl_fcp_attr_group);
        kset_unregister(reipl_fcp_kset);
        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_type_init(void)
{
    enum ipl_type reipl_type = ipl_info.type;
    struct ipl_parameter_block *reipl_block;
    unsigned long size;

    reipl_block = os_info_old_entry(OS_INFO_REIPL_BLOCK, &size);
    if (!reipl_block)
        goto out;
    /*
     * If we have an OS info reipl block, this will be used
     */
    if (reipl_block->hdr.pbt == DIAG308_IPL_TYPE_FCP) {
        memcpy(reipl_block_fcp, reipl_block, size);
        reipl_type = IPL_TYPE_FCP;
    } else if (reipl_block->hdr.pbt == DIAG308_IPL_TYPE_CCW) {
        memcpy(reipl_block_ccw, reipl_block, size);
        reipl_type = IPL_TYPE_CCW;
    }
out:
    return reipl_set_type(reipl_type);
}

static int __init reipl_init(void)
{
    int rc;

    reipl_kset = kset_create_and_add("reipl", NULL, firmware_kobj);
    if (!reipl_kset)
        return -ENOMEM;
    rc = sysfs_create_file(&reipl_kset->kobj, &reipl_type_attr.attr);
    if (rc) {
        kset_unregister(reipl_kset);
        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;
    return reipl_type_init();
}

static struct shutdown_action __refdata reipl_action = {
    .name   = SHUTDOWN_ACTION_REIPL_STR,
    .fn = reipl_run,
    .init   = reipl_init,
};

/*
 * 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:
        if (diag308_set_works)
            dump_method = DUMP_METHOD_CCW_DIAG;
        else if (MACHINE_IS_VM)
            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(void *unused)
{
    struct ccw_dev_id devid;
    static char buf[100];

    switch (dump_method) {
    case DUMP_METHOD_CCW_CIO:
        devid.devno = dump_block_ccw->ipl_info.ccw.devno;
        devid.ssid  = 0;
        reipl_ccw_dev(&devid);
        break;
    case DUMP_METHOD_CCW_VM:
        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;
    default:
        break;
    }
}

static void dump_run(struct shutdown_trigger *trigger)
{
    if (dump_method == DUMP_METHOD_NONE)
        return;
    smp_send_stop();
    smp_call_ipl_cpu(__dump_run, NULL);
}

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_kset->kobj, &dump_ccw_attr_group);
    if (rc) {
        free_page((unsigned long)dump_block_ccw);
        return rc;
    }
    dump_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
    dump_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
    dump_block_ccw->hdr.blk0_len = 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_kset->kobj, &dump_fcp_attr_group);
    if (rc) {
        free_page((unsigned long)dump_block_fcp);
        return rc;
    }
    dump_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
    dump_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
    dump_block_fcp->hdr.blk0_len = 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;
}

static int __init dump_init(void)
{
    int rc;

    dump_kset = kset_create_and_add("dump", NULL, firmware_kobj);
    if (!dump_kset)
        return -ENOMEM;
    rc = sysfs_create_file(&dump_kset->kobj, &dump_type_attr.attr);
    if (rc) {
        kset_unregister(dump_kset);
        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 struct shutdown_action __refdata dump_action = {
    .name   = SHUTDOWN_ACTION_DUMP_STR,
    .fn = dump_run,
    .init   = dump_init,
};

static void dump_reipl_run(struct shutdown_trigger *trigger)
{
    unsigned long ipib = (unsigned long) reipl_block_actual;
    unsigned int csum;

    csum = csum_partial(reipl_block_actual, reipl_block_actual->hdr.len, 0);
    mem_assign_absolute(S390_lowcore.ipib, ipib);
    mem_assign_absolute(S390_lowcore.ipib_checksum, csum);
    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,
};

/*
 * 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];
static char vmcmd_on_restart[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);
DEFINE_IPL_ATTR_STR_RW(vmcmd, on_restart, "%s\n", "%s\n", vmcmd_on_restart);

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,
    &sys_vmcmd_on_restart_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)
{
    char *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 if (strcmp(trigger->name, ON_RESTART_STR) == 0)
        cmd = vmcmd_on_restart;
    else
        return;

    if (strlen(cmd) == 0)
        return;
    __cpcmd(cmd, NULL, 0, NULL);
}

static int vmcmd_init(void)
{
    if (!MACHINE_IS_VM)
        return -EOPNOTSUPP;
    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)
{
    if (strcmp(trigger->name, ON_PANIC_STR) == 0 ||
        strcmp(trigger->name, ON_RESTART_STR) == 0)
        disabled_wait((unsigned long) __builtin_return_address(0));
    smp_stop_cpu();
}

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

/* action list */

static struct shutdown_action *shutdown_actions_list[] = {
    &ipl_action, &reipl_action, &dump_reipl_action, &dump_action,
    &vmcmd_action, &stop_action};
#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;

    for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
        if (sysfs_streq(buf, shutdown_actions_list[i]->name)) {
            if (shutdown_actions_list[i]->init_rc) {
                return shutdown_actions_list[i]->init_rc;
            } else {
                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)
{
    lgr_info_log();
    on_panic_trigger.action->fn(&on_panic_trigger);
    stop_run(&on_panic_trigger);
}

/* on restart */

static struct shutdown_trigger on_restart_trigger = {ON_RESTART_STR,
    &stop_action};

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

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

static struct kobj_attribute on_restart_attr =
    __ATTR(on_restart, 0644, on_restart_show, on_restart_store);

static void __do_restart(void *ignore)
{
    __arch_local_irq_stosm(0x04); /* enable DAT */
    smp_send_stop();
#ifdef CONFIG_CRASH_DUMP
    crash_kexec(NULL);
#endif
    on_restart_trigger.action->fn(&on_restart_trigger);
    stop_run(&on_restart_trigger);
}

void do_restart(void)
{
    tracing_off();
    debug_locks_off();
    lgr_info_log();
    smp_call_online_cpu(__do_restart, NULL);
}

/* 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);


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)
{
    shutdown_actions_kset = kset_create_and_add("shutdown_actions", NULL,
                            firmware_kobj);
    if (!shutdown_actions_kset)
        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;
    if (sysfs_create_file(&shutdown_actions_kset->kobj,
                  &on_restart_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;
        shutdown_actions_list[i]->init_rc =
            shutdown_actions_list[i]->init();
    }
}

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

__initcall(s390_ipl_init);

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,
    .priority = INT_MIN,
};

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);
}

void __init ipl_update_parameters(void)
{
    int rc;

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

void __init ipl_save_parameters(void)
{
    struct cio_iplinfo iplinfo;
    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;
    src = (void *)(unsigned long)S390_lowcore.ipl_parmblock_ptr;
    dst = (void *)IPL_PARMBLOCK_ORIGIN;
    memmove(dst, src, PAGE_SIZE);
    S390_lowcore.ipl_parmblock_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;

#ifdef CONFIG_64BIT
    if (diag308_set_works) {
        diag308_reset();
        return;
    }
#endif
    list_for_each_entry(reset, &rcall, list)
        reset->fn();
}

u32 dump_prefix_page;

void s390_reset_system(void (*func)(void *), void *data)
{
    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_DAT;
    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_DAT;
    S390_lowcore.program_new_psw.addr =
        PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;

    /* Store status at absolute zero */
    store_status();

    do_reset_calls();
    if (func)
        func(data);
}