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ipl.c

/*
 *  arch/s390/kernel/ipl.c
 *    ipl/reipl/dump support for Linux on s390.
 *
 *    Copyright IBM Corp. 2005,2007
 *    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>
#include <linux/ctype.h>
#include <linux/fs.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/setup.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
 */
#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;
};

/*
 * Five 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"

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

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 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);             \
      strstrip(_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 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);

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 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 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);
      strstrip(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(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);
}

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, 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 */

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

/* 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;
            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:
            if (diag308_set_works)
                  reipl_method = REIPL_METHOD_NSS_DIAG;
            else
                  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 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 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);
}

static void reipl_run(struct shutdown_trigger *trigger)
{
      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:
      default:
            break;
      }
      disabled_wait((unsigned long) __builtin_return_address(0));
}

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) && (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_kset->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;

      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;
      rc = reipl_set_type(ipl_info.type);
      if (rc)
            return rc;
      return 0;
}

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(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:
      default:
            return;
      }
      printk(KERN_EMERG "Dump failed!\n");
}

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,
};

/*
 * 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)
{
      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)
{
      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 (;;);
      }
}

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_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 (!shutdown_actions_list[i])
                  continue;
            if (strncmp(buf, shutdown_actions_list[i]->name,
                      strlen(shutdown_actions_list[i]->name)) == 0) {
                  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);


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;

      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;
      }
}

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 = 0,
};

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:
      default:
            /* 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;
      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();
}


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