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ipl.c

/*
 *  arch/s390/kernel/ipl.c
 *    ipl/reipl/dump support for Linux on s390.
 *
 *    Copyright (C) IBM Corp. 2005,2006
 *    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 <asm/ipl.h>
#include <asm/smp.h>
#include <asm/setup.h>
#include <asm/cpcmd.h>
#include <asm/cio.h>
#include <asm/ebcdic.h>
#include <asm/reset.h>
#include <asm/sclp.h>

#define IPL_PARM_BLOCK_VERSION 0

#define IPL_UNKNOWN_STR       "unknown"
#define IPL_CCW_STR           "ccw"
#define IPL_FCP_STR           "fcp"
#define IPL_FCP_DUMP_STR      "fcp_dump"
#define IPL_NSS_STR           "nss"

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

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

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

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

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

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

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

enum shutdown_action {
      SHUTDOWN_REIPL,
      SHUTDOWN_DUMP,
      SHUTDOWN_STOP,
};

#define SHUTDOWN_REIPL_STR "reipl"
#define SHUTDOWN_DUMP_STR  "dump"
#define SHUTDOWN_STOP_STR  "stop"

static char *shutdown_action_str(enum shutdown_action action)
{
      switch (action) {
      case SHUTDOWN_REIPL:
            return SHUTDOWN_REIPL_STR;
      case SHUTDOWN_DUMP:
            return SHUTDOWN_DUMP_STR;
      case SHUTDOWN_STOP:
            return SHUTDOWN_STOP_STR;
      default:
            return NULL;
      }
}

static int diag308_set_works = 0;

static int reipl_capabilities = IPL_TYPE_UNKNOWN;

static enum ipl_type reipl_type = IPL_TYPE_UNKNOWN;
static enum ipl_method reipl_method = REIPL_METHOD_DEFAULT;
static struct ipl_parameter_block *reipl_block_fcp;
static struct ipl_parameter_block *reipl_block_ccw;

static char reipl_nss_name[NSS_NAME_SIZE + 1];

static int dump_capabilities = DUMP_TYPE_NONE;
static enum dump_type dump_type = DUMP_TYPE_NONE;
static enum dump_method dump_method = DUMP_METHOD_NONE;
static struct ipl_parameter_block *dump_block_fcp;
static struct ipl_parameter_block *dump_block_ccw;

static enum shutdown_action on_panic_action = SHUTDOWN_STOP;

static struct sclp_ipl_info sclp_ipl_info;

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

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

/* SYSFS */

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

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

#define DEFINE_IPL_ATTR_STR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)\
static ssize_t sys_##_prefix##_##_name##_show(struct kset *kset,  \
            char *page)                               \
{                                                     \
      return sprintf(page, _fmt_out, _value);                     \
}                                                     \
static ssize_t sys_##_prefix##_##_name##_store(struct kset *kset, \
            const char *buf, size_t len)                    \
{                                                     \
      if (sscanf(buf, _fmt_in, _value) != 1)                      \
            return -EINVAL;                                 \
      return len;                                     \
}                                                     \
static struct subsys_attribute sys_##_prefix##_##_name##_attr =         \
      __ATTR(_name,(S_IRUGO | S_IWUSR),                     \
                  sys_##_prefix##_##_name##_show,                 \
                  sys_##_prefix##_##_name##_store);

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

/*
 * ipl section
 */

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

      if (ipl_flags & IPL_NSS_VALID)
            return IPL_TYPE_NSS;
      if (!(ipl_flags & IPL_DEVNO_VALID))
            return IPL_TYPE_UNKNOWN;
      if (!(ipl_flags & IPL_PARMBLOCK_VALID))
            return IPL_TYPE_CCW;
      if (ipl->hdr.version > IPL_MAX_SUPPORTED_VERSION)
            return IPL_TYPE_UNKNOWN;
      if (ipl->hdr.pbt != DIAG308_IPL_TYPE_FCP)
            return IPL_TYPE_UNKNOWN;
      if (ipl->ipl_info.fcp.opt == DIAG308_IPL_OPT_DUMP)
            return IPL_TYPE_FCP_DUMP;
      return IPL_TYPE_FCP;
}

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

struct ipl_info ipl_info;
EXPORT_SYMBOL_GPL(ipl_info);

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

static struct subsys_attribute sys_ipl_type_attr = __ATTR_RO(ipl_type);

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

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

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

static ssize_t ipl_parameter_read(struct kobject *kobj, struct bin_attribute *attr,
                          char *buf, loff_t off, size_t count)
{
      unsigned int size = IPL_PARMBLOCK_SIZE;

      if (off > size)
            return 0;
      if (off + count > size)
            count = size - off;
      memcpy(buf, (void *)IPL_PARMBLOCK_START + off, count);
      return count;
}

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

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

      if (off > size)
            return 0;
      if (off + count > size)
            count = size - off;
      memcpy(buf, scp_data + off, count);
      return count;
}

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

/* FCP ipl device attributes */

DEFINE_IPL_ATTR_RO(ipl_fcp, wwpn, "0x%016llx\n", (unsigned long long)
               IPL_PARMBLOCK_START->ipl_info.fcp.wwpn);
DEFINE_IPL_ATTR_RO(ipl_fcp, lun, "0x%016llx\n", (unsigned long long)
               IPL_PARMBLOCK_START->ipl_info.fcp.lun);
DEFINE_IPL_ATTR_RO(ipl_fcp, bootprog, "%lld\n", (unsigned long long)
               IPL_PARMBLOCK_START->ipl_info.fcp.bootprog);
DEFINE_IPL_ATTR_RO(ipl_fcp, br_lba, "%lld\n", (unsigned long long)
               IPL_PARMBLOCK_START->ipl_info.fcp.br_lba);

static struct attribute *ipl_fcp_attrs[] = {
      &sys_ipl_type_attr.attr,
      &sys_ipl_device_attr.attr,
      &sys_ipl_fcp_wwpn_attr.attr,
      &sys_ipl_fcp_lun_attr.attr,
      &sys_ipl_fcp_bootprog_attr.attr,
      &sys_ipl_fcp_br_lba_attr.attr,
      NULL,
};

static struct attribute_group ipl_fcp_attr_group = {
      .attrs = ipl_fcp_attrs,
};

/* CCW ipl device attributes */

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

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

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

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

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

/* NSS ipl device attributes */

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

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

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

/* UNKNOWN ipl device attributes */

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

static struct attribute_group ipl_unknown_attr_group = {
      .attrs = ipl_unknown_attrs,
};

static decl_subsys(ipl, NULL, NULL);

/*
 * reipl section
 */

/* FCP reipl device attributes */

DEFINE_IPL_ATTR_RW(reipl_fcp, wwpn, "0x%016llx\n", "%016llx\n",
               reipl_block_fcp->ipl_info.fcp.wwpn);
DEFINE_IPL_ATTR_RW(reipl_fcp, lun, "0x%016llx\n", "%016llx\n",
               reipl_block_fcp->ipl_info.fcp.lun);
DEFINE_IPL_ATTR_RW(reipl_fcp, bootprog, "%lld\n", "%lld\n",
               reipl_block_fcp->ipl_info.fcp.bootprog);
DEFINE_IPL_ATTR_RW(reipl_fcp, br_lba, "%lld\n", "%lld\n",
               reipl_block_fcp->ipl_info.fcp.br_lba);
DEFINE_IPL_ATTR_RW(reipl_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
               reipl_block_fcp->ipl_info.fcp.devno);

static struct attribute *reipl_fcp_attrs[] = {
      &sys_reipl_fcp_device_attr.attr,
      &sys_reipl_fcp_wwpn_attr.attr,
      &sys_reipl_fcp_lun_attr.attr,
      &sys_reipl_fcp_bootprog_attr.attr,
      &sys_reipl_fcp_br_lba_attr.attr,
      NULL,
};

static struct attribute_group reipl_fcp_attr_group = {
      .name  = IPL_FCP_STR,
      .attrs = reipl_fcp_attrs,
};

/* CCW reipl device attributes */

DEFINE_IPL_ATTR_RW(reipl_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
      reipl_block_ccw->ipl_info.ccw.devno);

static void reipl_get_ascii_loadparm(char *loadparm)
{
      memcpy(loadparm, &reipl_block_ccw->ipl_info.ccw.load_param,
             LOADPARM_LEN);
      EBCASC(loadparm, LOADPARM_LEN);
      loadparm[LOADPARM_LEN] = 0;
      strstrip(loadparm);
}

static ssize_t reipl_ccw_loadparm_show(struct kset *kset, char *page)
{
      char buf[LOADPARM_LEN + 1];

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

static ssize_t reipl_ccw_loadparm_store(struct kset *kset,
                              const char *buf, size_t len)
{
      int i, lp_len;

      /* ignore trailing newline */
      lp_len = len;
      if ((len > 0) && (buf[len - 1] == '\n'))
            lp_len--;
      /* loadparm can have max 8 characters and must not start with a blank */
      if ((lp_len > LOADPARM_LEN) || ((lp_len > 0) && (buf[0] == ' ')))
            return -EINVAL;
      /* loadparm can only contain "a-z,A-Z,0-9,SP,." */
      for (i = 0; i < lp_len; i++) {
            if (isalpha(buf[i]) || isdigit(buf[i]) || (buf[i] == ' ') ||
                (buf[i] == '.'))
                  continue;
            return -EINVAL;
      }
      /* initialize loadparm with blanks */
      memset(&reipl_block_ccw->ipl_info.ccw.load_param, ' ', LOADPARM_LEN);
      /* copy and convert to ebcdic */
      memcpy(&reipl_block_ccw->ipl_info.ccw.load_param, buf, lp_len);
      ASCEBC(reipl_block_ccw->ipl_info.ccw.load_param, LOADPARM_LEN);
      return len;
}

static struct subsys_attribute sys_reipl_ccw_loadparm_attr =
      __ATTR(loadparm, 0644, reipl_ccw_loadparm_show,
             reipl_ccw_loadparm_store);

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

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


/* NSS reipl device attributes */

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

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

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

/* reipl type */

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

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

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

static ssize_t reipl_type_store(struct kset *kset, const char *buf,
                        size_t len)
{
      int rc = -EINVAL;

      if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
            rc = reipl_set_type(IPL_TYPE_CCW);
      else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
            rc = reipl_set_type(IPL_TYPE_FCP);
      else if (strncmp(buf, IPL_NSS_STR, strlen(IPL_NSS_STR)) == 0)
            rc = reipl_set_type(IPL_TYPE_NSS);
      return (rc != 0) ? rc : len;
}

static struct subsys_attribute reipl_type_attr =
            __ATTR(reipl_type, 0644, reipl_type_show, reipl_type_store);

static decl_subsys(reipl, NULL, NULL);

/*
 * dump section
 */

/* FCP dump device attributes */

DEFINE_IPL_ATTR_RW(dump_fcp, wwpn, "0x%016llx\n", "%016llx\n",
               dump_block_fcp->ipl_info.fcp.wwpn);
DEFINE_IPL_ATTR_RW(dump_fcp, lun, "0x%016llx\n", "%016llx\n",
               dump_block_fcp->ipl_info.fcp.lun);
DEFINE_IPL_ATTR_RW(dump_fcp, bootprog, "%lld\n", "%lld\n",
               dump_block_fcp->ipl_info.fcp.bootprog);
DEFINE_IPL_ATTR_RW(dump_fcp, br_lba, "%lld\n", "%lld\n",
               dump_block_fcp->ipl_info.fcp.br_lba);
DEFINE_IPL_ATTR_RW(dump_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
               dump_block_fcp->ipl_info.fcp.devno);

static struct attribute *dump_fcp_attrs[] = {
      &sys_dump_fcp_device_attr.attr,
      &sys_dump_fcp_wwpn_attr.attr,
      &sys_dump_fcp_lun_attr.attr,
      &sys_dump_fcp_bootprog_attr.attr,
      &sys_dump_fcp_br_lba_attr.attr,
      NULL,
};

static struct attribute_group dump_fcp_attr_group = {
      .name  = IPL_FCP_STR,
      .attrs = dump_fcp_attrs,
};

/* CCW dump device attributes */

DEFINE_IPL_ATTR_RW(dump_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
               dump_block_ccw->ipl_info.ccw.devno);

static struct attribute *dump_ccw_attrs[] = {
      &sys_dump_ccw_device_attr.attr,
      NULL,
};

static struct attribute_group dump_ccw_attr_group = {
      .name  = IPL_CCW_STR,
      .attrs = dump_ccw_attrs,
};

/* dump type */

static int dump_set_type(enum dump_type type)
{
      if (!(dump_capabilities & type))
            return -EINVAL;
      switch(type) {
      case DUMP_TYPE_CCW:
            if (MACHINE_IS_VM)
                  dump_method = DUMP_METHOD_CCW_VM;
            else if (diag308_set_works)
                  dump_method = DUMP_METHOD_CCW_DIAG;
            else
                  dump_method = DUMP_METHOD_CCW_CIO;
            break;
      case DUMP_TYPE_FCP:
            dump_method = DUMP_METHOD_FCP_DIAG;
            break;
      default:
            dump_method = DUMP_METHOD_NONE;
      }
      dump_type = type;
      return 0;
}

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

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

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

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

static decl_subsys(dump, NULL, NULL);

/*
 * Shutdown actions section
 */

static decl_subsys(shutdown_actions, NULL, NULL);

/* on panic */

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

static ssize_t on_panic_store(struct kset *kset, const char *buf,
                        size_t len)
{
      if (strncmp(buf, SHUTDOWN_REIPL_STR, strlen(SHUTDOWN_REIPL_STR)) == 0)
            on_panic_action = SHUTDOWN_REIPL;
      else if (strncmp(buf, SHUTDOWN_DUMP_STR,
                   strlen(SHUTDOWN_DUMP_STR)) == 0)
            on_panic_action = SHUTDOWN_DUMP;
      else if (strncmp(buf, SHUTDOWN_STOP_STR,
                   strlen(SHUTDOWN_STOP_STR)) == 0)
            on_panic_action = SHUTDOWN_STOP;
      else
            return -EINVAL;

      return len;
}

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

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

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

static void do_dump(void)
{
      struct ccw_dev_id devid;
      static char buf[100];

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

/* init functions */

static int __init ipl_register_fcp_files(void)
{
      int rc;

      rc = sysfs_create_group(&ipl_subsys.kobj,
                        &ipl_fcp_attr_group);
      if (rc)
            goto out;
      rc = sysfs_create_bin_file(&ipl_subsys.kobj,
                           &ipl_parameter_attr);
      if (rc)
            goto out_ipl_parm;
      rc = sysfs_create_bin_file(&ipl_subsys.kobj,
                           &ipl_scp_data_attr);
      if (!rc)
            goto out;

      sysfs_remove_bin_file(&ipl_subsys.kobj, &ipl_parameter_attr);

out_ipl_parm:
      sysfs_remove_group(&ipl_subsys.kobj, &ipl_fcp_attr_group);
out:
      return rc;
}

static int __init ipl_init(void)
{
      int rc;

      rc = firmware_register(&ipl_subsys);
      if (rc)
            return rc;
      switch (ipl_info.type) {
      case IPL_TYPE_CCW:
            rc = sysfs_create_group(&ipl_subsys.kobj,
                              &ipl_ccw_attr_group);
            break;
      case IPL_TYPE_FCP:
      case IPL_TYPE_FCP_DUMP:
            rc = ipl_register_fcp_files();
            break;
      case IPL_TYPE_NSS:
            rc = sysfs_create_group(&ipl_subsys.kobj,
                              &ipl_nss_attr_group);
            break;
      default:
            rc = sysfs_create_group(&ipl_subsys.kobj,
                              &ipl_unknown_attr_group);
            break;
      }
      if (rc)
            firmware_unregister(&ipl_subsys);
      return rc;
}

static void __init reipl_probe(void)
{
      void *buffer;

      buffer = (void *) get_zeroed_page(GFP_KERNEL);
      if (!buffer)
            return;
      if (diag308(DIAG308_STORE, buffer) == DIAG308_RC_OK)
            diag308_set_works = 1;
      free_page((unsigned long)buffer);
}

static int __init reipl_nss_init(void)
{
      int rc;

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

static int __init reipl_ccw_init(void)
{
      int rc;

      reipl_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
      if (!reipl_block_ccw)
            return -ENOMEM;
      rc = sysfs_create_group(&reipl_subsys.kobj, &reipl_ccw_attr_group);
      if (rc) {
            free_page((unsigned long)reipl_block_ccw);
            return rc;
      }
      reipl_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
      reipl_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
      reipl_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
      reipl_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
      /* check if read scp info worked and set loadparm */
      if (sclp_ipl_info.is_valid)
            memcpy(reipl_block_ccw->ipl_info.ccw.load_param,
                   &sclp_ipl_info.loadparm, LOADPARM_LEN);
      else
            /* read scp info failed: set empty loadparm (EBCDIC blanks) */
            memset(reipl_block_ccw->ipl_info.ccw.load_param, 0x40,
                   LOADPARM_LEN);
      /* FIXME: check for diag308_set_works when enabling diag ccw reipl */
      if (!MACHINE_IS_VM)
            sys_reipl_ccw_loadparm_attr.attr.mode = S_IRUGO;
      if (ipl_info.type == IPL_TYPE_CCW)
            reipl_block_ccw->ipl_info.ccw.devno = ipl_devno;
      reipl_capabilities |= IPL_TYPE_CCW;
      return 0;
}

static int __init reipl_fcp_init(void)
{
      int rc;

      if ((!diag308_set_works) && (ipl_info.type != IPL_TYPE_FCP))
            return 0;
      if ((!diag308_set_works) && (ipl_info.type == IPL_TYPE_FCP))
            make_attrs_ro(reipl_fcp_attrs);

      reipl_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
      if (!reipl_block_fcp)
            return -ENOMEM;
      rc = sysfs_create_group(&reipl_subsys.kobj, &reipl_fcp_attr_group);
      if (rc) {
            free_page((unsigned long)reipl_block_fcp);
            return rc;
      }
      if (ipl_info.type == IPL_TYPE_FCP) {
            memcpy(reipl_block_fcp, IPL_PARMBLOCK_START, PAGE_SIZE);
      } else {
            reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
            reipl_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
            reipl_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
            reipl_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
            reipl_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_IPL;
      }
      reipl_capabilities |= IPL_TYPE_FCP;
      return 0;
}

static int __init reipl_init(void)
{
      int rc;

      rc = firmware_register(&reipl_subsys);
      if (rc)
            return rc;
      rc = subsys_create_file(&reipl_subsys, &reipl_type_attr);
      if (rc) {
            firmware_unregister(&reipl_subsys);
            return rc;
      }
      rc = reipl_ccw_init();
      if (rc)
            return rc;
      rc = reipl_fcp_init();
      if (rc)
            return rc;
      rc = reipl_nss_init();
      if (rc)
            return rc;
      rc = reipl_set_type(ipl_info.type);
      if (rc)
            return rc;
      return 0;
}

static int __init dump_ccw_init(void)
{
      int rc;

      dump_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
      if (!dump_block_ccw)
            return -ENOMEM;
      rc = sysfs_create_group(&dump_subsys.kobj, &dump_ccw_attr_group);
      if (rc) {
            free_page((unsigned long)dump_block_ccw);
            return rc;
      }
      dump_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
      dump_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
      dump_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
      dump_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
      dump_capabilities |= DUMP_TYPE_CCW;
      return 0;
}

static int __init dump_fcp_init(void)
{
      int rc;

      if (!sclp_ipl_info.has_dump)
            return 0; /* LDIPL DUMP is not installed */
      if (!diag308_set_works)
            return 0;
      dump_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
      if (!dump_block_fcp)
            return -ENOMEM;
      rc = sysfs_create_group(&dump_subsys.kobj, &dump_fcp_attr_group);
      if (rc) {
            free_page((unsigned long)dump_block_fcp);
            return rc;
      }
      dump_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
      dump_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
      dump_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
      dump_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
      dump_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_DUMP;
      dump_capabilities |= DUMP_TYPE_FCP;
      return 0;
}

#define SHUTDOWN_ON_PANIC_PRIO 0

static int shutdown_on_panic_notify(struct notifier_block *self,
                            unsigned long event, void *data)
{
      if (on_panic_action == SHUTDOWN_DUMP)
            do_dump();
      else if (on_panic_action == SHUTDOWN_REIPL)
            do_reipl();
      return NOTIFY_OK;
}

static struct notifier_block shutdown_on_panic_nb = {
      .notifier_call = shutdown_on_panic_notify,
      .priority = SHUTDOWN_ON_PANIC_PRIO
};

static int __init dump_init(void)
{
      int rc;

      rc = firmware_register(&dump_subsys);
      if (rc)
            return rc;
      rc = subsys_create_file(&dump_subsys, &dump_type_attr);
      if (rc) {
            firmware_unregister(&dump_subsys);
            return rc;
      }
      rc = dump_ccw_init();
      if (rc)
            return rc;
      rc = dump_fcp_init();
      if (rc)
            return rc;
      dump_set_type(DUMP_TYPE_NONE);
      return 0;
}

static int __init shutdown_actions_init(void)
{
      int rc;

      rc = firmware_register(&shutdown_actions_subsys);
      if (rc)
            return rc;
      rc = subsys_create_file(&shutdown_actions_subsys, &on_panic_attr);
      if (rc) {
            firmware_unregister(&shutdown_actions_subsys);
            return rc;
      }
      atomic_notifier_chain_register(&panic_notifier_list,
                               &shutdown_on_panic_nb);
      return 0;
}

static int __init s390_ipl_init(void)
{
      int rc;

      sclp_get_ipl_info(&sclp_ipl_info);
      reipl_probe();
      rc = ipl_init();
      if (rc)
            return rc;
      rc = reipl_init();
      if (rc)
            return rc;
      rc = dump_init();
      if (rc)
            return rc;
      rc = shutdown_actions_init();
      if (rc)
            return rc;
      return 0;
}

__initcall(s390_ipl_init);

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

      if (cio_get_iplinfo(&iplinfo))
            return;

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

static LIST_HEAD(rcall);
static DEFINE_MUTEX(rcall_mutex);

void register_reset_call(struct reset_call *reset)
{
      mutex_lock(&rcall_mutex);
      list_add(&reset->list, &rcall);
      mutex_unlock(&rcall_mutex);
}
EXPORT_SYMBOL_GPL(register_reset_call);

void unregister_reset_call(struct reset_call *reset)
{
      mutex_lock(&rcall_mutex);
      list_del(&reset->list);
      mutex_unlock(&rcall_mutex);
}
EXPORT_SYMBOL_GPL(unregister_reset_call);

static void do_reset_calls(void)
{
      struct reset_call *reset;

      list_for_each_entry(reset, &rcall, list)
            reset->fn();
}

u32 dump_prefix_page;

void s390_reset_system(void)
{
      struct _lowcore *lc;

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

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

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

      /* Disable prefixing */
      set_prefix(0);

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

      /* Set new machine check handler */
      S390_lowcore.mcck_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
      S390_lowcore.mcck_new_psw.addr =
            PSW_ADDR_AMODE | (unsigned long) s390_base_mcck_handler;

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

      do_reset_calls();
}

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