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dasd_eckd.c

/*
 * File...........: linux/drivers/s390/block/dasd_eckd.c
 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
 *              Horst Hummel <Horst.Hummel@de.ibm.com>
 *              Carsten Otte <Cotte@de.ibm.com>
 *              Martin Schwidefsky <schwidefsky@de.ibm.com>
 * Bugreports.to..: <Linux390@de.ibm.com>
 * Copyright IBM Corp. 1999, 2009
 * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
 * Author.........: Nigel Hislop <hislop_nigel@emc.com>
 */

#define KMSG_COMPONENT "dasd"

#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/hdreg.h>      /* HDIO_GETGEO                    */
#include <linux/bio.h>
#include <linux/module.h>
#include <linux/init.h>

#include <asm/debug.h>
#include <asm/idals.h>
#include <asm/ebcdic.h>
#include <asm/io.h>
#include <asm/todclk.h>
#include <asm/uaccess.h>
#include <asm/cio.h>
#include <asm/ccwdev.h>
#include <asm/itcw.h>

#include "dasd_int.h"
#include "dasd_eckd.h"
#include "../cio/chsc.h"


#ifdef PRINTK_HEADER
#undef PRINTK_HEADER
#endif                        /* PRINTK_HEADER */
#define PRINTK_HEADER "dasd(eckd):"

#define ECKD_C0(i) (i->home_bytes)
#define ECKD_F(i) (i->formula)
#define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
                (i->factors.f_0x02.f1))
#define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
                (i->factors.f_0x02.f2))
#define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
                (i->factors.f_0x02.f3))
#define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
#define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
#define ECKD_F6(i) (i->factor6)
#define ECKD_F7(i) (i->factor7)
#define ECKD_F8(i) (i->factor8)

MODULE_LICENSE("GPL");

static struct dasd_discipline dasd_eckd_discipline;

/* The ccw bus type uses this table to find devices that it sends to
 * dasd_eckd_probe */
static struct ccw_device_id dasd_eckd_ids[] = {
      { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
      { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
      { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3390, 0), .driver_info = 0x3},
      { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
      { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
      { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
      { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
      { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
      { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
      { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
      { /* end of list */ },
};

MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);

static struct ccw_driver dasd_eckd_driver; /* see below */

/* initial attempt at a probe function. this can be simplified once
 * the other detection code is gone */
static int
dasd_eckd_probe (struct ccw_device *cdev)
{
      int ret;

      /* set ECKD specific ccw-device options */
      ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE);
      if (ret) {
            DBF_EVENT(DBF_WARNING,
                   "dasd_eckd_probe: could not set ccw-device options "
                   "for %s\n", dev_name(&cdev->dev));
            return ret;
      }
      ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
      return ret;
}

static int
dasd_eckd_set_online(struct ccw_device *cdev)
{
      return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
}

static const int sizes_trk0[] = { 28, 148, 84 };
#define LABEL_SIZE 140

static inline unsigned int
round_up_multiple(unsigned int no, unsigned int mult)
{
      int rem = no % mult;
      return (rem ? no - rem + mult : no);
}

static inline unsigned int
ceil_quot(unsigned int d1, unsigned int d2)
{
      return (d1 + (d2 - 1)) / d2;
}

static unsigned int
recs_per_track(struct dasd_eckd_characteristics * rdc,
             unsigned int kl, unsigned int dl)
{
      int dn, kn;

      switch (rdc->dev_type) {
      case 0x3380:
            if (kl)
                  return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
                               ceil_quot(dl + 12, 32));
            else
                  return 1499 / (15 + ceil_quot(dl + 12, 32));
      case 0x3390:
            dn = ceil_quot(dl + 6, 232) + 1;
            if (kl) {
                  kn = ceil_quot(kl + 6, 232) + 1;
                  return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
                               9 + ceil_quot(dl + 6 * dn, 34));
            } else
                  return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
      case 0x9345:
            dn = ceil_quot(dl + 6, 232) + 1;
            if (kl) {
                  kn = ceil_quot(kl + 6, 232) + 1;
                  return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
                               ceil_quot(dl + 6 * dn, 34));
            } else
                  return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
      }
      return 0;
}

static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
{
      geo->cyl = (__u16) cyl;
      geo->head = cyl >> 16;
      geo->head <<= 4;
      geo->head |= head;
}

static int
check_XRC (struct ccw1         *de_ccw,
           struct DE_eckd_data *data,
           struct dasd_device  *device)
{
        struct dasd_eckd_private *private;
      int rc;

        private = (struct dasd_eckd_private *) device->private;
      if (!private->rdc_data.facilities.XRC_supported)
            return 0;

        /* switch on System Time Stamp - needed for XRC Support */
      data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
      data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */

      rc = get_sync_clock(&data->ep_sys_time);
      /* Ignore return code if sync clock is switched off. */
      if (rc == -ENOSYS || rc == -EACCES)
            rc = 0;

      de_ccw->count = sizeof(struct DE_eckd_data);
      de_ccw->flags |= CCW_FLAG_SLI;
      return rc;
}

static int
define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
            unsigned int totrk, int cmd, struct dasd_device *device)
{
      struct dasd_eckd_private *private;
      u32 begcyl, endcyl;
      u16 heads, beghead, endhead;
      int rc = 0;

      private = (struct dasd_eckd_private *) device->private;

      ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
      ccw->flags = 0;
      ccw->count = 16;
      ccw->cda = (__u32) __pa(data);

      memset(data, 0, sizeof(struct DE_eckd_data));
      switch (cmd) {
      case DASD_ECKD_CCW_READ_HOME_ADDRESS:
      case DASD_ECKD_CCW_READ_RECORD_ZERO:
      case DASD_ECKD_CCW_READ:
      case DASD_ECKD_CCW_READ_MT:
      case DASD_ECKD_CCW_READ_CKD:
      case DASD_ECKD_CCW_READ_CKD_MT:
      case DASD_ECKD_CCW_READ_KD:
      case DASD_ECKD_CCW_READ_KD_MT:
      case DASD_ECKD_CCW_READ_COUNT:
            data->mask.perm = 0x1;
            data->attributes.operation = private->attrib.operation;
            break;
      case DASD_ECKD_CCW_WRITE:
      case DASD_ECKD_CCW_WRITE_MT:
      case DASD_ECKD_CCW_WRITE_KD:
      case DASD_ECKD_CCW_WRITE_KD_MT:
            data->mask.perm = 0x02;
            data->attributes.operation = private->attrib.operation;
            rc = check_XRC (ccw, data, device);
            break;
      case DASD_ECKD_CCW_WRITE_CKD:
      case DASD_ECKD_CCW_WRITE_CKD_MT:
            data->attributes.operation = DASD_BYPASS_CACHE;
            rc = check_XRC (ccw, data, device);
            break;
      case DASD_ECKD_CCW_ERASE:
      case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
      case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
            data->mask.perm = 0x3;
            data->mask.auth = 0x1;
            data->attributes.operation = DASD_BYPASS_CACHE;
            rc = check_XRC (ccw, data, device);
            break;
      default:
            dev_err(&device->cdev->dev,
                  "0x%x is not a known command\n", cmd);
            break;
      }

      data->attributes.mode = 0x3;  /* ECKD */

      if ((private->rdc_data.cu_type == 0x2105 ||
           private->rdc_data.cu_type == 0x2107 ||
           private->rdc_data.cu_type == 0x1750)
          && !(private->uses_cdl && trk < 2))
            data->ga_extended |= 0x40; /* Regular Data Format Mode */

      heads = private->rdc_data.trk_per_cyl;
      begcyl = trk / heads;
      beghead = trk % heads;
      endcyl = totrk / heads;
      endhead = totrk % heads;

      /* check for sequential prestage - enhance cylinder range */
      if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
          data->attributes.operation == DASD_SEQ_ACCESS) {

            if (endcyl + private->attrib.nr_cyl < private->real_cyl)
                  endcyl += private->attrib.nr_cyl;
            else
                  endcyl = (private->real_cyl - 1);
      }

      set_ch_t(&data->beg_ext, begcyl, beghead);
      set_ch_t(&data->end_ext, endcyl, endhead);
      return rc;
}

static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
                         struct dasd_device  *device)
{
      struct dasd_eckd_private *private;
      int rc;

      private = (struct dasd_eckd_private *) device->private;
      if (!private->rdc_data.facilities.XRC_supported)
            return 0;

      /* switch on System Time Stamp - needed for XRC Support */
      pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid'   */
      pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
      pfxdata->validity.time_stamp = 1;       /* 'Time Stamp Valid'   */

      rc = get_sync_clock(&pfxdata->define_extent.ep_sys_time);
      /* Ignore return code if sync clock is switched off. */
      if (rc == -ENOSYS || rc == -EACCES)
            rc = 0;
      return rc;
}

static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
                    unsigned int rec_on_trk, int count, int cmd,
                    struct dasd_device *device, unsigned int reclen,
                    unsigned int tlf)
{
      struct dasd_eckd_private *private;
      int sector;
      int dn, d;

      private = (struct dasd_eckd_private *) device->private;

      memset(data, 0, sizeof(*data));
      sector = 0;
      if (rec_on_trk) {
            switch (private->rdc_data.dev_type) {
            case 0x3390:
                  dn = ceil_quot(reclen + 6, 232);
                  d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
                  sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
                  break;
            case 0x3380:
                  d = 7 + ceil_quot(reclen + 12, 32);
                  sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
                  break;
            }
      }
      data->sector = sector;
      /* note: meaning of count depends on the operation
       *     for record based I/O it's the number of records, but for
       *     track based I/O it's the number of tracks
       */
      data->count = count;
      switch (cmd) {
      case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
            data->operation.orientation = 0x3;
            data->operation.operation = 0x03;
            break;
      case DASD_ECKD_CCW_READ_HOME_ADDRESS:
            data->operation.orientation = 0x3;
            data->operation.operation = 0x16;
            break;
      case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
            data->operation.orientation = 0x1;
            data->operation.operation = 0x03;
            data->count++;
            break;
      case DASD_ECKD_CCW_READ_RECORD_ZERO:
            data->operation.orientation = 0x3;
            data->operation.operation = 0x16;
            data->count++;
            break;
      case DASD_ECKD_CCW_WRITE:
      case DASD_ECKD_CCW_WRITE_MT:
      case DASD_ECKD_CCW_WRITE_KD:
      case DASD_ECKD_CCW_WRITE_KD_MT:
            data->auxiliary.length_valid = 0x1;
            data->length = reclen;
            data->operation.operation = 0x01;
            break;
      case DASD_ECKD_CCW_WRITE_CKD:
      case DASD_ECKD_CCW_WRITE_CKD_MT:
            data->auxiliary.length_valid = 0x1;
            data->length = reclen;
            data->operation.operation = 0x03;
            break;
      case DASD_ECKD_CCW_WRITE_TRACK_DATA:
            data->auxiliary.length_valid = 0x1;
            data->length = reclen;  /* not tlf, as one might think */
            data->operation.operation = 0x3F;
            data->extended_operation = 0x23;
            break;
      case DASD_ECKD_CCW_READ:
      case DASD_ECKD_CCW_READ_MT:
      case DASD_ECKD_CCW_READ_KD:
      case DASD_ECKD_CCW_READ_KD_MT:
            data->auxiliary.length_valid = 0x1;
            data->length = reclen;
            data->operation.operation = 0x06;
            break;
      case DASD_ECKD_CCW_READ_CKD:
      case DASD_ECKD_CCW_READ_CKD_MT:
            data->auxiliary.length_valid = 0x1;
            data->length = reclen;
            data->operation.operation = 0x16;
            break;
      case DASD_ECKD_CCW_READ_COUNT:
            data->operation.operation = 0x06;
            break;
      case DASD_ECKD_CCW_READ_TRACK_DATA:
            data->auxiliary.length_valid = 0x1;
            data->length = tlf;
            data->operation.operation = 0x0C;
            break;
      case DASD_ECKD_CCW_ERASE:
            data->length = reclen;
            data->auxiliary.length_valid = 0x1;
            data->operation.operation = 0x0b;
            break;
      default:
            DBF_DEV_EVENT(DBF_ERR, device,
                      "fill LRE unknown opcode 0x%x", cmd);
            BUG();
      }
      set_ch_t(&data->seek_addr,
             trk / private->rdc_data.trk_per_cyl,
             trk % private->rdc_data.trk_per_cyl);
      data->search_arg.cyl = data->seek_addr.cyl;
      data->search_arg.head = data->seek_addr.head;
      data->search_arg.record = rec_on_trk;
}

static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
                  unsigned int trk, unsigned int totrk, int cmd,
                  struct dasd_device *basedev, struct dasd_device *startdev,
                  unsigned char format, unsigned int rec_on_trk, int count,
                  unsigned int blksize, unsigned int tlf)
{
      struct dasd_eckd_private *basepriv, *startpriv;
      struct DE_eckd_data *dedata;
      struct LRE_eckd_data *lredata;
      u32 begcyl, endcyl;
      u16 heads, beghead, endhead;
      int rc = 0;

      basepriv = (struct dasd_eckd_private *) basedev->private;
      startpriv = (struct dasd_eckd_private *) startdev->private;
      dedata = &pfxdata->define_extent;
      lredata = &pfxdata->locate_record;

      ccw->cmd_code = DASD_ECKD_CCW_PFX;
      ccw->flags = 0;
      ccw->count = sizeof(*pfxdata);
      ccw->cda = (__u32) __pa(pfxdata);

      memset(pfxdata, 0, sizeof(*pfxdata));
      /* prefix data */
      if (format > 1) {
            DBF_DEV_EVENT(DBF_ERR, basedev,
                        "PFX LRE unknown format 0x%x", format);
            BUG();
            return -EINVAL;
      }
      pfxdata->format = format;
      pfxdata->base_address = basepriv->ned->unit_addr;
      pfxdata->base_lss = basepriv->ned->ID;
      pfxdata->validity.define_extent = 1;

      /* private uid is kept up to date, conf_data may be outdated */
      if (startpriv->uid.type != UA_BASE_DEVICE) {
            pfxdata->validity.verify_base = 1;
            if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
                  pfxdata->validity.hyper_pav = 1;
      }

      /* define extend data (mostly)*/
      switch (cmd) {
      case DASD_ECKD_CCW_READ_HOME_ADDRESS:
      case DASD_ECKD_CCW_READ_RECORD_ZERO:
      case DASD_ECKD_CCW_READ:
      case DASD_ECKD_CCW_READ_MT:
      case DASD_ECKD_CCW_READ_CKD:
      case DASD_ECKD_CCW_READ_CKD_MT:
      case DASD_ECKD_CCW_READ_KD:
      case DASD_ECKD_CCW_READ_KD_MT:
      case DASD_ECKD_CCW_READ_COUNT:
            dedata->mask.perm = 0x1;
            dedata->attributes.operation = basepriv->attrib.operation;
            break;
      case DASD_ECKD_CCW_READ_TRACK_DATA:
            dedata->mask.perm = 0x1;
            dedata->attributes.operation = basepriv->attrib.operation;
            dedata->blk_size = 0;
            break;
      case DASD_ECKD_CCW_WRITE:
      case DASD_ECKD_CCW_WRITE_MT:
      case DASD_ECKD_CCW_WRITE_KD:
      case DASD_ECKD_CCW_WRITE_KD_MT:
            dedata->mask.perm = 0x02;
            dedata->attributes.operation = basepriv->attrib.operation;
            rc = check_XRC_on_prefix(pfxdata, basedev);
            break;
      case DASD_ECKD_CCW_WRITE_CKD:
      case DASD_ECKD_CCW_WRITE_CKD_MT:
            dedata->attributes.operation = DASD_BYPASS_CACHE;
            rc = check_XRC_on_prefix(pfxdata, basedev);
            break;
      case DASD_ECKD_CCW_ERASE:
      case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
      case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
            dedata->mask.perm = 0x3;
            dedata->mask.auth = 0x1;
            dedata->attributes.operation = DASD_BYPASS_CACHE;
            rc = check_XRC_on_prefix(pfxdata, basedev);
            break;
      case DASD_ECKD_CCW_WRITE_TRACK_DATA:
            dedata->mask.perm = 0x02;
            dedata->attributes.operation = basepriv->attrib.operation;
            dedata->blk_size = blksize;
            rc = check_XRC_on_prefix(pfxdata, basedev);
            break;
      default:
            DBF_DEV_EVENT(DBF_ERR, basedev,
                      "PFX LRE unknown opcode 0x%x", cmd);
            BUG();
            return -EINVAL;
      }

      dedata->attributes.mode = 0x3;      /* ECKD */

      if ((basepriv->rdc_data.cu_type == 0x2105 ||
           basepriv->rdc_data.cu_type == 0x2107 ||
           basepriv->rdc_data.cu_type == 0x1750)
          && !(basepriv->uses_cdl && trk < 2))
            dedata->ga_extended |= 0x40; /* Regular Data Format Mode */

      heads = basepriv->rdc_data.trk_per_cyl;
      begcyl = trk / heads;
      beghead = trk % heads;
      endcyl = totrk / heads;
      endhead = totrk % heads;

      /* check for sequential prestage - enhance cylinder range */
      if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
          dedata->attributes.operation == DASD_SEQ_ACCESS) {

            if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
                  endcyl += basepriv->attrib.nr_cyl;
            else
                  endcyl = (basepriv->real_cyl - 1);
      }

      set_ch_t(&dedata->beg_ext, begcyl, beghead);
      set_ch_t(&dedata->end_ext, endcyl, endhead);

      if (format == 1) {
            fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
                        basedev, blksize, tlf);
      }

      return rc;
}

static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
              unsigned int trk, unsigned int totrk, int cmd,
              struct dasd_device *basedev, struct dasd_device *startdev)
{
      return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
                    0, 0, 0, 0, 0);
}

static void
locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
            unsigned int rec_on_trk, int no_rec, int cmd,
            struct dasd_device * device, int reclen)
{
      struct dasd_eckd_private *private;
      int sector;
      int dn, d;

      private = (struct dasd_eckd_private *) device->private;

      DBF_DEV_EVENT(DBF_INFO, device,
              "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
              trk, rec_on_trk, no_rec, cmd, reclen);

      ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
      ccw->flags = 0;
      ccw->count = 16;
      ccw->cda = (__u32) __pa(data);

      memset(data, 0, sizeof(struct LO_eckd_data));
      sector = 0;
      if (rec_on_trk) {
            switch (private->rdc_data.dev_type) {
            case 0x3390:
                  dn = ceil_quot(reclen + 6, 232);
                  d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
                  sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
                  break;
            case 0x3380:
                  d = 7 + ceil_quot(reclen + 12, 32);
                  sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
                  break;
            }
      }
      data->sector = sector;
      data->count = no_rec;
      switch (cmd) {
      case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
            data->operation.orientation = 0x3;
            data->operation.operation = 0x03;
            break;
      case DASD_ECKD_CCW_READ_HOME_ADDRESS:
            data->operation.orientation = 0x3;
            data->operation.operation = 0x16;
            break;
      case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
            data->operation.orientation = 0x1;
            data->operation.operation = 0x03;
            data->count++;
            break;
      case DASD_ECKD_CCW_READ_RECORD_ZERO:
            data->operation.orientation = 0x3;
            data->operation.operation = 0x16;
            data->count++;
            break;
      case DASD_ECKD_CCW_WRITE:
      case DASD_ECKD_CCW_WRITE_MT:
      case DASD_ECKD_CCW_WRITE_KD:
      case DASD_ECKD_CCW_WRITE_KD_MT:
            data->auxiliary.last_bytes_used = 0x1;
            data->length = reclen;
            data->operation.operation = 0x01;
            break;
      case DASD_ECKD_CCW_WRITE_CKD:
      case DASD_ECKD_CCW_WRITE_CKD_MT:
            data->auxiliary.last_bytes_used = 0x1;
            data->length = reclen;
            data->operation.operation = 0x03;
            break;
      case DASD_ECKD_CCW_READ:
      case DASD_ECKD_CCW_READ_MT:
      case DASD_ECKD_CCW_READ_KD:
      case DASD_ECKD_CCW_READ_KD_MT:
            data->auxiliary.last_bytes_used = 0x1;
            data->length = reclen;
            data->operation.operation = 0x06;
            break;
      case DASD_ECKD_CCW_READ_CKD:
      case DASD_ECKD_CCW_READ_CKD_MT:
            data->auxiliary.last_bytes_used = 0x1;
            data->length = reclen;
            data->operation.operation = 0x16;
            break;
      case DASD_ECKD_CCW_READ_COUNT:
            data->operation.operation = 0x06;
            break;
      case DASD_ECKD_CCW_ERASE:
            data->length = reclen;
            data->auxiliary.last_bytes_used = 0x1;
            data->operation.operation = 0x0b;
            break;
      default:
            DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
                        "opcode 0x%x", cmd);
      }
      set_ch_t(&data->seek_addr,
             trk / private->rdc_data.trk_per_cyl,
             trk % private->rdc_data.trk_per_cyl);
      data->search_arg.cyl = data->seek_addr.cyl;
      data->search_arg.head = data->seek_addr.head;
      data->search_arg.record = rec_on_trk;
}

/*
 * Returns 1 if the block is one of the special blocks that needs
 * to get read/written with the KD variant of the command.
 * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 * Luckily the KD variants differ only by one bit (0x08) from the
 * normal variant. So don't wonder about code like:
 * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 *         ccw->cmd_code |= 0x8;
 */
static inline int
dasd_eckd_cdl_special(int blk_per_trk, int recid)
{
      if (recid < 3)
            return 1;
      if (recid < blk_per_trk)
            return 0;
      if (recid < 2 * blk_per_trk)
            return 1;
      return 0;
}

/*
 * Returns the record size for the special blocks of the cdl format.
 * Only returns something useful if dasd_eckd_cdl_special is true
 * for the recid.
 */
static inline int
dasd_eckd_cdl_reclen(int recid)
{
      if (recid < 3)
            return sizes_trk0[recid];
      return LABEL_SIZE;
}

/*
 * Generate device unique id that specifies the physical device.
 */
static int dasd_eckd_generate_uid(struct dasd_device *device,
                          struct dasd_uid *uid)
{
      struct dasd_eckd_private *private;
      int count;

      private = (struct dasd_eckd_private *) device->private;
      if (!private)
            return -ENODEV;
      if (!private->ned || !private->gneq)
            return -ENODEV;

      memset(uid, 0, sizeof(struct dasd_uid));
      memcpy(uid->vendor, private->ned->HDA_manufacturer,
             sizeof(uid->vendor) - 1);
      EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
      memcpy(uid->serial, private->ned->HDA_location,
             sizeof(uid->serial) - 1);
      EBCASC(uid->serial, sizeof(uid->serial) - 1);
      uid->ssid = private->gneq->subsystemID;
      uid->real_unit_addr = private->ned->unit_addr;;
      if (private->sneq) {
            uid->type = private->sneq->sua_flags;
            if (uid->type == UA_BASE_PAV_ALIAS)
                  uid->base_unit_addr = private->sneq->base_unit_addr;
      } else {
            uid->type = UA_BASE_DEVICE;
      }
      if (private->vdsneq) {
            for (count = 0; count < 16; count++) {
                  sprintf(uid->vduit+2*count, "%02x",
                        private->vdsneq->uit[count]);
            }
      }
      return 0;
}

static struct dasd_ccw_req *dasd_eckd_build_rcd_lpm(struct dasd_device *device,
                                        void *rcd_buffer,
                                        struct ciw *ciw, __u8 lpm)
{
      struct dasd_ccw_req *cqr;
      struct ccw1 *ccw;

      cqr = dasd_smalloc_request("ECKD", 1 /* RCD */, ciw->count, device);

      if (IS_ERR(cqr)) {
            DBF_DEV_EVENT(DBF_WARNING, device, "%s",
                        "Could not allocate RCD request");
            return cqr;
      }

      ccw = cqr->cpaddr;
      ccw->cmd_code = ciw->cmd;
      ccw->cda = (__u32)(addr_t)rcd_buffer;
      ccw->count = ciw->count;

      cqr->startdev = device;
      cqr->memdev = device;
      cqr->block = NULL;
      cqr->expires = 10*HZ;
      cqr->lpm = lpm;
      clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
      cqr->retries = 2;
      cqr->buildclk = get_clock();
      cqr->status = DASD_CQR_FILLED;
      return cqr;
}

static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
                           void **rcd_buffer,
                           int *rcd_buffer_size, __u8 lpm)
{
      struct ciw *ciw;
      char *rcd_buf = NULL;
      int ret;
      struct dasd_ccw_req *cqr;

      /*
       * scan for RCD command in extended SenseID data
       */
      ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
      if (!ciw || ciw->cmd == 0) {
            ret = -EOPNOTSUPP;
            goto out_error;
      }
      rcd_buf = kzalloc(ciw->count, GFP_KERNEL | GFP_DMA);
      if (!rcd_buf) {
            ret = -ENOMEM;
            goto out_error;
      }

      /*
       * buffer has to start with EBCDIC "V1.0" to show
       * support for virtual device SNEQ
       */
      rcd_buf[0] = 0xE5;
      rcd_buf[1] = 0xF1;
      rcd_buf[2] = 0x4B;
      rcd_buf[3] = 0xF0;
      cqr = dasd_eckd_build_rcd_lpm(device, rcd_buf, ciw, lpm);
      if (IS_ERR(cqr)) {
            ret =  PTR_ERR(cqr);
            goto out_error;
      }
      ret = dasd_sleep_on(cqr);
      /*
       * on success we update the user input parms
       */
      dasd_sfree_request(cqr, cqr->memdev);
      if (ret)
            goto out_error;

      *rcd_buffer_size = ciw->count;
      *rcd_buffer = rcd_buf;
      return 0;
out_error:
      kfree(rcd_buf);
      *rcd_buffer = NULL;
      *rcd_buffer_size = 0;
      return ret;
}

static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
{

      struct dasd_sneq *sneq;
      int i, count;

      private->ned = NULL;
      private->sneq = NULL;
      private->vdsneq = NULL;
      private->gneq = NULL;
      count = private->conf_len / sizeof(struct dasd_sneq);
      sneq = (struct dasd_sneq *)private->conf_data;
      for (i = 0; i < count; ++i) {
            if (sneq->flags.identifier == 1 && sneq->format == 1)
                  private->sneq = sneq;
            else if (sneq->flags.identifier == 1 && sneq->format == 4)
                  private->vdsneq = (struct vd_sneq *)sneq;
            else if (sneq->flags.identifier == 2)
                  private->gneq = (struct dasd_gneq *)sneq;
            else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
                  private->ned = (struct dasd_ned *)sneq;
            sneq++;
      }
      if (!private->ned || !private->gneq) {
            private->ned = NULL;
            private->sneq = NULL;
            private->vdsneq = NULL;
            private->gneq = NULL;
            return -EINVAL;
      }
      return 0;

};

static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
{
      struct dasd_gneq *gneq;
      int i, count, found;

      count = conf_len / sizeof(*gneq);
      gneq = (struct dasd_gneq *)conf_data;
      found = 0;
      for (i = 0; i < count; ++i) {
            if (gneq->flags.identifier == 2) {
                  found = 1;
                  break;
            }
            gneq++;
      }
      if (found)
            return ((char *)gneq)[18] & 0x07;
      else
            return 0;
}

static int dasd_eckd_read_conf(struct dasd_device *device)
{
      void *conf_data;
      int conf_len, conf_data_saved;
      int rc;
      __u8 lpm;
      struct dasd_eckd_private *private;
      struct dasd_eckd_path *path_data;

      private = (struct dasd_eckd_private *) device->private;
      path_data = (struct dasd_eckd_path *) &private->path_data;
      path_data->opm = ccw_device_get_path_mask(device->cdev);
      lpm = 0x80;
      conf_data_saved = 0;
      /* get configuration data per operational path */
      for (lpm = 0x80; lpm; lpm>>= 1) {
            if (lpm & path_data->opm){
                  rc = dasd_eckd_read_conf_lpm(device, &conf_data,
                                         &conf_len, lpm);
                  if (rc && rc != -EOPNOTSUPP) {      /* -EOPNOTSUPP is ok */
                        DBF_EVENT(DBF_WARNING,
                                "Read configuration data returned "
                                "error %d for device: %s", rc,
                                dev_name(&device->cdev->dev));
                        return rc;
                  }
                  if (conf_data == NULL) {
                        DBF_EVENT(DBF_WARNING, "No configuration "
                                "data retrieved for device: %s",
                                dev_name(&device->cdev->dev));
                        continue;   /* no error */
                  }
                  /* save first valid configuration data */
                  if (!conf_data_saved) {
                        kfree(private->conf_data);
                        private->conf_data = conf_data;
                        private->conf_len = conf_len;
                        if (dasd_eckd_identify_conf_parts(private)) {
                              private->conf_data = NULL;
                              private->conf_len = 0;
                              kfree(conf_data);
                              continue;
                        }
                        conf_data_saved++;
                  }
                  switch (dasd_eckd_path_access(conf_data, conf_len)) {
                  case 0x02:
                        path_data->npm |= lpm;
                        break;
                  case 0x03:
                        path_data->ppm |= lpm;
                        break;
                  }
                  if (conf_data != private->conf_data)
                        kfree(conf_data);
            }
      }
      return 0;
}

static int dasd_eckd_read_features(struct dasd_device *device)
{
      struct dasd_psf_prssd_data *prssdp;
      struct dasd_rssd_features *features;
      struct dasd_ccw_req *cqr;
      struct ccw1 *ccw;
      int rc;
      struct dasd_eckd_private *private;

      private = (struct dasd_eckd_private *) device->private;
      cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
                           1 /* PSF */    + 1 /* RSSD */ ,
                           (sizeof(struct dasd_psf_prssd_data) +
                            sizeof(struct dasd_rssd_features)),
                           device);
      if (IS_ERR(cqr)) {
            DBF_EVENT(DBF_WARNING, "Could not allocate initialization "
                    "request for device: %s",
                    dev_name(&device->cdev->dev));
            return PTR_ERR(cqr);
      }
      cqr->startdev = device;
      cqr->memdev = device;
      cqr->block = NULL;
      clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
      cqr->retries = 5;
      cqr->expires = 10 * HZ;

      /* Prepare for Read Subsystem Data */
      prssdp = (struct dasd_psf_prssd_data *) cqr->data;
      memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
      prssdp->order = PSF_ORDER_PRSSD;
      prssdp->suborder = 0x41;      /* Read Feature Codes */
      /* all other bytes of prssdp must be zero */

      ccw = cqr->cpaddr;
      ccw->cmd_code = DASD_ECKD_CCW_PSF;
      ccw->count = sizeof(struct dasd_psf_prssd_data);
      ccw->flags |= CCW_FLAG_CC;
      ccw->cda = (__u32)(addr_t) prssdp;

      /* Read Subsystem Data - feature codes */
      features = (struct dasd_rssd_features *) (prssdp + 1);
      memset(features, 0, sizeof(struct dasd_rssd_features));

      ccw++;
      ccw->cmd_code = DASD_ECKD_CCW_RSSD;
      ccw->count = sizeof(struct dasd_rssd_features);
      ccw->cda = (__u32)(addr_t) features;

      cqr->buildclk = get_clock();
      cqr->status = DASD_CQR_FILLED;
      rc = dasd_sleep_on(cqr);
      if (rc == 0) {
            prssdp = (struct dasd_psf_prssd_data *) cqr->data;
            features = (struct dasd_rssd_features *) (prssdp + 1);
            memcpy(&private->features, features,
                   sizeof(struct dasd_rssd_features));
      }
      dasd_sfree_request(cqr, cqr->memdev);
      return rc;
}


/*
 * Build CP for Perform Subsystem Function - SSC.
 */
static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
                                        int enable_pav)
{
      struct dasd_ccw_req *cqr;
      struct dasd_psf_ssc_data *psf_ssc_data;
      struct ccw1 *ccw;

      cqr = dasd_smalloc_request("ECKD", 1 /* PSF */ ,
                          sizeof(struct dasd_psf_ssc_data),
                          device);

      if (IS_ERR(cqr)) {
            DBF_DEV_EVENT(DBF_WARNING, device, "%s",
                     "Could not allocate PSF-SSC request");
            return cqr;
      }
      psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
      psf_ssc_data->order = PSF_ORDER_SSC;
      psf_ssc_data->suborder = 0x40;
      if (enable_pav) {
            psf_ssc_data->suborder |= 0x88;
            psf_ssc_data->reserved[0] = 0x88;
      }
      ccw = cqr->cpaddr;
      ccw->cmd_code = DASD_ECKD_CCW_PSF;
      ccw->cda = (__u32)(addr_t)psf_ssc_data;
      ccw->count = 66;

      cqr->startdev = device;
      cqr->memdev = device;
      cqr->block = NULL;
      cqr->expires = 10*HZ;
      cqr->buildclk = get_clock();
      cqr->status = DASD_CQR_FILLED;
      return cqr;
}

/*
 * Perform Subsystem Function.
 * It is necessary to trigger CIO for channel revalidation since this
 * call might change behaviour of DASD devices.
 */
static int
dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav)
{
      struct dasd_ccw_req *cqr;
      int rc;

      cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
      if (IS_ERR(cqr))
            return PTR_ERR(cqr);

      rc = dasd_sleep_on(cqr);
      if (!rc)
            /* trigger CIO to reprobe devices */
            css_schedule_reprobe();
      dasd_sfree_request(cqr, cqr->memdev);
      return rc;
}

/*
 * Valide storage server of current device.
 */
static int dasd_eckd_validate_server(struct dasd_device *device)
{
      int rc;
      struct dasd_eckd_private *private;
      int enable_pav;

      if (dasd_nopav || MACHINE_IS_VM)
            enable_pav = 0;
      else
            enable_pav = 1;
      rc = dasd_eckd_psf_ssc(device, enable_pav);
      /* may be requested feature is not available on server,
       * therefore just report error and go ahead */
      private = (struct dasd_eckd_private *) device->private;
      DBF_EVENT(DBF_WARNING, "PSF-SSC on storage subsystem %s.%s.%04x "
              "returned rc=%d for device: %s",
              private->uid.vendor, private->uid.serial,
              private->uid.ssid, rc, dev_name(&device->cdev->dev));
      /* RE-Read Configuration Data */
      return dasd_eckd_read_conf(device);
}

/*
 * Check device characteristics.
 * If the device is accessible using ECKD discipline, the device is enabled.
 */
static int
dasd_eckd_check_characteristics(struct dasd_device *device)
{
      struct dasd_eckd_private *private;
      struct dasd_block *block;
      int is_known, rc;

      private = (struct dasd_eckd_private *) device->private;
      if (!private) {
            private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
            if (!private) {
                  dev_warn(&device->cdev->dev,
                         "Allocating memory for private DASD data "
                         "failed\n");
                  return -ENOMEM;
            }
            device->private = (void *) private;
      } else {
            memset(private, 0, sizeof(*private));
      }
      /* Invalidate status of initial analysis. */
      private->init_cqr_status = -1;
      /* Set default cache operations. */
      private->attrib.operation = DASD_NORMAL_CACHE;
      private->attrib.nr_cyl = 0;

      /* Read Configuration Data */
      rc = dasd_eckd_read_conf(device);
      if (rc)
            goto out_err1;

      /* Generate device unique id and register in devmap */
      rc = dasd_eckd_generate_uid(device, &private->uid);
      if (rc)
            goto out_err1;
      dasd_set_uid(device->cdev, &private->uid);

      if (private->uid.type == UA_BASE_DEVICE) {
            block = dasd_alloc_block();
            if (IS_ERR(block)) {
                  DBF_EVENT(DBF_WARNING, "could not allocate dasd "
                          "block structure for device: %s",
                          dev_name(&device->cdev->dev));
                  rc = PTR_ERR(block);
                  goto out_err1;
            }
            device->block = block;
            block->base = device;
      }

      /* register lcu with alias handling, enable PAV if this is a new lcu */
      is_known = dasd_alias_make_device_known_to_lcu(device);
      if (is_known < 0) {
            rc = is_known;
            goto out_err2;
      }
      if (!is_known) {
            /* new lcu found */
            rc = dasd_eckd_validate_server(device); /* will switch pav on */
            if (rc)
                  goto out_err3;
      }

      /* Read Feature Codes */
      rc = dasd_eckd_read_features(device);
      if (rc)
            goto out_err3;

      /* Read Device Characteristics */
      rc = dasd_generic_read_dev_chars(device, "ECKD", &private->rdc_data,
                               64);
      if (rc) {
            DBF_EVENT(DBF_WARNING,
                    "Read device characteristics failed, rc=%d for "
                    "device: %s", rc, dev_name(&device->cdev->dev));
            goto out_err3;
      }
      /* find the vaild cylinder size */
      if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
          private->rdc_data.long_no_cyl)
            private->real_cyl = private->rdc_data.long_no_cyl;
      else
            private->real_cyl = private->rdc_data.no_cyl;

      dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
             "with %d cylinders, %d heads, %d sectors\n",
             private->rdc_data.dev_type,
             private->rdc_data.dev_model,
             private->rdc_data.cu_type,
             private->rdc_data.cu_model.model,
             private->real_cyl,
             private->rdc_data.trk_per_cyl,
             private->rdc_data.sec_per_trk);
      return 0;

out_err3:
      dasd_alias_disconnect_device_from_lcu(device);
out_err2:
      dasd_free_block(device->block);
      device->block = NULL;
out_err1:
      kfree(private->conf_data);
      kfree(device->private);
      device->private = NULL;
      return rc;
}

static void dasd_eckd_uncheck_device(struct dasd_device *device)
{
      struct dasd_eckd_private *private;

      private = (struct dasd_eckd_private *) device->private;
      dasd_alias_disconnect_device_from_lcu(device);
      private->ned = NULL;
      private->sneq = NULL;
      private->vdsneq = NULL;
      private->gneq = NULL;
      private->conf_len = 0;
      kfree(private->conf_data);
      private->conf_data = NULL;
}

static struct dasd_ccw_req *
dasd_eckd_analysis_ccw(struct dasd_device *device)
{
      struct dasd_eckd_private *private;
      struct eckd_count *count_data;
      struct LO_eckd_data *LO_data;
      struct dasd_ccw_req *cqr;
      struct ccw1 *ccw;
      int cplength, datasize;
      int i;

      private = (struct dasd_eckd_private *) device->private;

      cplength = 8;
      datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
      cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
                           cplength, datasize, device);
      if (IS_ERR(cqr))
            return cqr;
      ccw = cqr->cpaddr;
      /* Define extent for the first 3 tracks. */
      define_extent(ccw++, cqr->data, 0, 2,
                  DASD_ECKD_CCW_READ_COUNT, device);
      LO_data = cqr->data + sizeof(struct DE_eckd_data);
      /* Locate record for the first 4 records on track 0. */
      ccw[-1].flags |= CCW_FLAG_CC;
      locate_record(ccw++, LO_data++, 0, 0, 4,
                  DASD_ECKD_CCW_READ_COUNT, device, 0);

      count_data = private->count_area;
      for (i = 0; i < 4; i++) {
            ccw[-1].flags |= CCW_FLAG_CC;
            ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
            ccw->flags = 0;
            ccw->count = 8;
            ccw->cda = (__u32)(addr_t) count_data;
            ccw++;
            count_data++;
      }

      /* Locate record for the first record on track 2. */
      ccw[-1].flags |= CCW_FLAG_CC;
      locate_record(ccw++, LO_data++, 2, 0, 1,
                  DASD_ECKD_CCW_READ_COUNT, device, 0);
      /* Read count ccw. */
      ccw[-1].flags |= CCW_FLAG_CC;
      ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
      ccw->flags = 0;
      ccw->count = 8;
      ccw->cda = (__u32)(addr_t) count_data;

      cqr->block = NULL;
      cqr->startdev = device;
      cqr->memdev = device;
      cqr->retries = 0;
      cqr->buildclk = get_clock();
      cqr->status = DASD_CQR_FILLED;
      return cqr;
}

/*
 * This is the callback function for the init_analysis cqr. It saves
 * the status of the initial analysis ccw before it frees it and kicks
 * the device to continue the startup sequence. This will call
 * dasd_eckd_do_analysis again (if the devices has not been marked
 * for deletion in the meantime).
 */
static void
dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, void *data)
{
      struct dasd_eckd_private *private;
      struct dasd_device *device;

      device = init_cqr->startdev;
      private = (struct dasd_eckd_private *) device->private;
      private->init_cqr_status = init_cqr->status;
      dasd_sfree_request(init_cqr, device);
      dasd_kick_device(device);
}

static int
dasd_eckd_start_analysis(struct dasd_block *block)
{
      struct dasd_eckd_private *private;
      struct dasd_ccw_req *init_cqr;

      private = (struct dasd_eckd_private *) block->base->private;
      init_cqr = dasd_eckd_analysis_ccw(block->base);
      if (IS_ERR(init_cqr))
            return PTR_ERR(init_cqr);
      init_cqr->callback = dasd_eckd_analysis_callback;
      init_cqr->callback_data = NULL;
      init_cqr->expires = 5*HZ;
      dasd_add_request_head(init_cqr);
      return -EAGAIN;
}

static int
dasd_eckd_end_analysis(struct dasd_block *block)
{
      struct dasd_device *device;
      struct dasd_eckd_private *private;
      struct eckd_count *count_area;
      unsigned int sb, blk_per_trk;
      int status, i;

      device = block->base;
      private = (struct dasd_eckd_private *) device->private;
      status = private->init_cqr_status;
      private->init_cqr_status = -1;
      if (status != DASD_CQR_DONE) {
            dev_warn(&device->cdev->dev,
                      "The DASD is not formatted\n");
            return -EMEDIUMTYPE;
      }

      private->uses_cdl = 1;
      /* Check Track 0 for Compatible Disk Layout */
      count_area = NULL;
      for (i = 0; i < 3; i++) {
            if (private->count_area[i].kl != 4 ||
                private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
                  private->uses_cdl = 0;
                  break;
            }
      }
      if (i == 3)
            count_area = &private->count_area[4];

      if (private->uses_cdl == 0) {
            for (i = 0; i < 5; i++) {
                  if ((private->count_area[i].kl != 0) ||
                      (private->count_area[i].dl !=
                       private->count_area[0].dl))
                        break;
            }
            if (i == 5)
                  count_area = &private->count_area[0];
      } else {
            if (private->count_area[3].record == 1)
                  dev_warn(&device->cdev->dev,
                         "Track 0 has no records following the VTOC\n");
      }
      if (count_area != NULL && count_area->kl == 0) {
            /* we found notthing violating our disk layout */
            if (dasd_check_blocksize(count_area->dl) == 0)
                  block->bp_block = count_area->dl;
      }
      if (block->bp_block == 0) {
            dev_warn(&device->cdev->dev,
                   "The disk layout of the DASD is not supported\n");
            return -EMEDIUMTYPE;
      }
      block->s2b_shift = 0;   /* bits to shift 512 to get a block */
      for (sb = 512; sb < block->bp_block; sb = sb << 1)
            block->s2b_shift++;

      blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
      block->blocks = (private->real_cyl *
                    private->rdc_data.trk_per_cyl *
                    blk_per_trk);

      dev_info(&device->cdev->dev,
             "DASD with %d KB/block, %d KB total size, %d KB/track, "
             "%s\n", (block->bp_block >> 10),
             ((private->real_cyl *
               private->rdc_data.trk_per_cyl *
               blk_per_trk * (block->bp_block >> 9)) >> 1),
             ((blk_per_trk * block->bp_block) >> 10),
             private->uses_cdl ?
             "compatible disk layout" : "linux disk layout");

      return 0;
}

static int dasd_eckd_do_analysis(struct dasd_block *block)
{
      struct dasd_eckd_private *private;

      private = (struct dasd_eckd_private *) block->base->private;
      if (private->init_cqr_status < 0)
            return dasd_eckd_start_analysis(block);
      else
            return dasd_eckd_end_analysis(block);
}

static int dasd_eckd_ready_to_online(struct dasd_device *device)
{
      return dasd_alias_add_device(device);
};

static int dasd_eckd_online_to_ready(struct dasd_device *device)
{
      return dasd_alias_remove_device(device);
};

static int
dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
{
      struct dasd_eckd_private *private;

      private = (struct dasd_eckd_private *) block->base->private;
      if (dasd_check_blocksize(block->bp_block) == 0) {
            geo->sectors = recs_per_track(&private->rdc_data,
                                    0, block->bp_block);
      }
      geo->cylinders = private->rdc_data.no_cyl;
      geo->heads = private->rdc_data.trk_per_cyl;
      return 0;
}

static struct dasd_ccw_req *
dasd_eckd_format_device(struct dasd_device * device,
                  struct format_data_t * fdata)
{
      struct dasd_eckd_private *private;
      struct dasd_ccw_req *fcp;
      struct eckd_count *ect;
      struct ccw1 *ccw;
      void *data;
      int rpt;
      struct ch_t address;
      int cplength, datasize;
      int i;
      int intensity = 0;
      int r0_perm;

      private = (struct dasd_eckd_private *) device->private;
      rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
      set_ch_t(&address,
             fdata->start_unit / private->rdc_data.trk_per_cyl,
             fdata->start_unit % private->rdc_data.trk_per_cyl);

      /* Sanity checks. */
      if (fdata->start_unit >=
          (private->real_cyl * private->rdc_data.trk_per_cyl)) {
            dev_warn(&device->cdev->dev, "Start track number %d used in "
                   "formatting is too big\n", fdata->start_unit);
            return ERR_PTR(-EINVAL);
      }
      if (fdata->start_unit > fdata->stop_unit) {
            dev_warn(&device->cdev->dev, "Start track %d used in "
                   "formatting exceeds end track\n", fdata->start_unit);
            return ERR_PTR(-EINVAL);
      }
      if (dasd_check_blocksize(fdata->blksize) != 0) {
            dev_warn(&device->cdev->dev,
                   "The DASD cannot be formatted with block size %d\n",
                   fdata->blksize);
            return ERR_PTR(-EINVAL);
      }

      /*
       * fdata->intensity is a bit string that tells us what to do:
       *   Bit 0: write record zero
       *   Bit 1: write home address, currently not supported
       *   Bit 2: invalidate tracks
       *   Bit 3: use OS/390 compatible disk layout (cdl)
       *   Bit 4: do not allow storage subsystem to modify record zero
       * Only some bit combinations do make sense.
       */
      if (fdata->intensity & 0x10) {
            r0_perm = 0;
            intensity = fdata->intensity & ~0x10;
      } else {
            r0_perm = 1;
            intensity = fdata->intensity;
      }
      switch (intensity) {
      case 0x00:  /* Normal format */
      case 0x08:  /* Normal format, use cdl. */
            cplength = 2 + rpt;
            datasize = sizeof(struct DE_eckd_data) +
                  sizeof(struct LO_eckd_data) +
                  rpt * sizeof(struct eckd_count);
            break;
      case 0x01:  /* Write record zero and format track. */
      case 0x09:  /* Write record zero and format track, use cdl. */
            cplength = 3 + rpt;
            datasize = sizeof(struct DE_eckd_data) +
                  sizeof(struct LO_eckd_data) +
                  sizeof(struct eckd_count) +
                  rpt * sizeof(struct eckd_count);
            break;
      case 0x04:  /* Invalidate track. */
      case 0x0c:  /* Invalidate track, use cdl. */
            cplength = 3;
            datasize = sizeof(struct DE_eckd_data) +
                  sizeof(struct LO_eckd_data) +
                  sizeof(struct eckd_count);
            break;
      default:
            dev_warn(&device->cdev->dev, "An I/O control call used "
                   "incorrect flags 0x%x\n", fdata->intensity);
            return ERR_PTR(-EINVAL);
      }
      /* Allocate the format ccw request. */
      fcp = dasd_smalloc_request(dasd_eckd_discipline.name,
                           cplength, datasize, device);
      if (IS_ERR(fcp))
            return fcp;

      data = fcp->data;
      ccw = fcp->cpaddr;

      switch (intensity & ~0x08) {
      case 0x00: /* Normal format. */
            define_extent(ccw++, (struct DE_eckd_data *) data,
                        fdata->start_unit, fdata->start_unit,
                        DASD_ECKD_CCW_WRITE_CKD, device);
            /* grant subsystem permission to format R0 */
            if (r0_perm)
                  ((struct DE_eckd_data *)data)->ga_extended |= 0x04;
            data += sizeof(struct DE_eckd_data);
            ccw[-1].flags |= CCW_FLAG_CC;
            locate_record(ccw++, (struct LO_eckd_data *) data,
                        fdata->start_unit, 0, rpt,
                        DASD_ECKD_CCW_WRITE_CKD, device,
                        fdata->blksize);
            data += sizeof(struct LO_eckd_data);
            break;
      case 0x01: /* Write record zero + format track. */
            define_extent(ccw++, (struct DE_eckd_data *) data,
                        fdata->start_unit, fdata->start_unit,
                        DASD_ECKD_CCW_WRITE_RECORD_ZERO,
                        device);
            data += sizeof(struct DE_eckd_data);
            ccw[-1].flags |= CCW_FLAG_CC;
            locate_record(ccw++, (struct LO_eckd_data *) data,
                        fdata->start_unit, 0, rpt + 1,
                        DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
                        device->block->bp_block);
            data += sizeof(struct LO_eckd_data);
            break;
      case 0x04: /* Invalidate track. */
            define_extent(ccw++, (struct DE_eckd_data *) data,
                        fdata->start_unit, fdata->start_unit,
                        DASD_ECKD_CCW_WRITE_CKD, device);
            data += sizeof(struct DE_eckd_data);
            ccw[-1].flags |= CCW_FLAG_CC;
            locate_record(ccw++, (struct LO_eckd_data *) data,
                        fdata->start_unit, 0, 1,
                        DASD_ECKD_CCW_WRITE_CKD, device, 8);
            data += sizeof(struct LO_eckd_data);
            break;
      }
      if (intensity & 0x01) { /* write record zero */
            ect = (struct eckd_count *) data;
            data += sizeof(struct eckd_count);
            ect->cyl = address.cyl;
            ect->head = address.head;
            ect->record = 0;
            ect->kl = 0;
            ect->dl = 8;
            ccw[-1].flags |= CCW_FLAG_CC;
            ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
            ccw->flags = CCW_FLAG_SLI;
            ccw->count = 8;
            ccw->cda = (__u32)(addr_t) ect;
            ccw++;
      }
      if ((intensity & ~0x08) & 0x04) {   /* erase track */
            ect = (struct eckd_count *) data;
            data += sizeof(struct eckd_count);
            ect->cyl = address.cyl;
            ect->head = address.head;
            ect->record = 1;
            ect->kl = 0;
            ect->dl = 0;
            ccw[-1].flags |= CCW_FLAG_CC;
            ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
            ccw->flags = CCW_FLAG_SLI;
            ccw->count = 8;
            ccw->cda = (__u32)(addr_t) ect;
      } else {          /* write remaining records */
            for (i = 0; i < rpt; i++) {
                  ect = (struct eckd_count *) data;
                  data += sizeof(struct eckd_count);
                  ect->cyl = address.cyl;
                  ect->head = address.head;
                  ect->record = i + 1;
                  ect->kl = 0;
                  ect->dl = fdata->blksize;
                  /* Check for special tracks 0-1 when formatting CDL */
                  if ((intensity & 0x08) &&
                      fdata->start_unit == 0) {
                        if (i < 3) {
                              ect->kl = 4;
                              ect->dl = sizes_trk0[i] - 4;
                        }
                  }
                  if ((intensity & 0x08) &&
                      fdata->start_unit == 1) {
                        ect->kl = 44;
                        ect->dl = LABEL_SIZE - 44;
                  }
                  ccw[-1].flags |= CCW_FLAG_CC;
                  ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
                  ccw->flags = CCW_FLAG_SLI;
                  ccw->count = 8;
                  ccw->cda = (__u32)(addr_t) ect;
                  ccw++;
            }
      }
      fcp->startdev = device;
      fcp->memdev = device;
      clear_bit(DASD_CQR_FLAGS_USE_ERP, &fcp->flags);
      fcp->retries = 5; /* set retry counter to enable default ERP */
      fcp->buildclk = get_clock();
      fcp->status = DASD_CQR_FILLED;
      return fcp;
}

static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
{
      cqr->status = DASD_CQR_FILLED;
      if (cqr->block && (cqr->startdev != cqr->block->base)) {
            dasd_eckd_reset_ccw_to_base_io(cqr);
            cqr->startdev = cqr->block->base;
      }
};

static dasd_erp_fn_t
dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
{
      struct dasd_device *device = (struct dasd_device *) cqr->startdev;
      struct ccw_device *cdev = device->cdev;

      switch (cdev->id.cu_type) {
      case 0x3990:
      case 0x2105:
      case 0x2107:
      case 0x1750:
            return dasd_3990_erp_action;
      case 0x9343:
      case 0x3880:
      default:
            return dasd_default_erp_action;
      }
}

static dasd_erp_fn_t
dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
{
      return dasd_default_erp_postaction;
}


static void dasd_eckd_handle_unsolicited_interrupt(struct dasd_device *device,
                                       struct irb *irb)
{
      char mask;
      char *sense = NULL;

      /* first of all check for state change pending interrupt */
      mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
      if ((scsw_dstat(&irb->scsw) & mask) == mask) {
            dasd_generic_handle_state_change(device);
            return;
      }

      /* summary unit check */
      if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
          (irb->ecw[7] == 0x0D)) {
            dasd_alias_handle_summary_unit_check(device, irb);
            return;
      }

      sense = dasd_get_sense(irb);
      /* service information message SIM */
      if (sense && !(sense[27] & DASD_SENSE_BIT_0) &&
          ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
            dasd_3990_erp_handle_sim(device, sense);
            dasd_schedule_device_bh(device);
            return;
      }

      if ((scsw_cc(&irb->scsw) == 1) &&
          (scsw_fctl(&irb->scsw) & SCSW_FCTL_START_FUNC) &&
          (scsw_actl(&irb->scsw) & SCSW_ACTL_START_PEND) &&
          (scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND)) {
            /* fake irb do nothing, they are handled elsewhere */
            dasd_schedule_device_bh(device);
            return;
      }

      if (!sense) {
            /* just report other unsolicited interrupts */
            DBF_DEV_EVENT(DBF_ERR, device, "%s",
                      "unsolicited interrupt received");
      } else {
            DBF_DEV_EVENT(DBF_ERR, device, "%s",
                      "unsolicited interrupt received "
                      "(sense available)");
            device->discipline->dump_sense_dbf(device, irb, "unsolicited");
      }

      dasd_schedule_device_bh(device);
      return;
};


static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
                                     struct dasd_device *startdev,
                                     struct dasd_block *block,
                                     struct request *req,
                                     sector_t first_rec,
                                     sector_t last_rec,
                                     sector_t first_trk,
                                     sector_t last_trk,
                                     unsigned int first_offs,
                                     unsigned int last_offs,
                                     unsigned int blk_per_trk,
                                     unsigned int blksize)
{
      struct dasd_eckd_private *private;
      unsigned long *idaws;
      struct LO_eckd_data *LO_data;
      struct dasd_ccw_req *cqr;
      struct ccw1 *ccw;
      struct req_iterator iter;
      struct bio_vec *bv;
      char *dst;
      unsigned int off;
      int count, cidaw, cplength, datasize;
      sector_t recid;
      unsigned char cmd, rcmd;
      int use_prefix;
      struct dasd_device *basedev;

      basedev = block->base;
      private = (struct dasd_eckd_private *) basedev->private;
      if (rq_data_dir(req) == READ)
            cmd = DASD_ECKD_CCW_READ_MT;
      else if (rq_data_dir(req) == WRITE)
            cmd = DASD_ECKD_CCW_WRITE_MT;
      else
            return ERR_PTR(-EINVAL);

      /* Check struct bio and count the number of blocks for the request. */
      count = 0;
      cidaw = 0;
      rq_for_each_segment(bv, req, iter) {
            if (bv->bv_len & (blksize - 1))
                  /* Eckd can only do full blocks. */
                  return ERR_PTR(-EINVAL);
            count += bv->bv_len >> (block->s2b_shift + 9);
#if defined(CONFIG_64BIT)
            if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
                  cidaw += bv->bv_len >> (block->s2b_shift + 9);
#endif
      }
      /* Paranoia. */
      if (count != last_rec - first_rec + 1)
            return ERR_PTR(-EINVAL);

      /* use the prefix command if available */
      use_prefix = private->features.feature[8] & 0x01;
      if (use_prefix) {
            /* 1x prefix + number of blocks */
            cplength = 2 + count;
            /* 1x prefix + cidaws*sizeof(long) */
            datasize = sizeof(struct PFX_eckd_data) +
                  sizeof(struct LO_eckd_data) +
                  cidaw * sizeof(unsigned long);
      } else {
            /* 1x define extent + 1x locate record + number of blocks */
            cplength = 2 + count;
            /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
            datasize = sizeof(struct DE_eckd_data) +
                  sizeof(struct LO_eckd_data) +
                  cidaw * sizeof(unsigned long);
      }
      /* Find out the number of additional locate record ccws for cdl. */
      if (private->uses_cdl && first_rec < 2*blk_per_trk) {
            if (last_rec >= 2*blk_per_trk)
                  count = 2*blk_per_trk - first_rec;
            cplength += count;
            datasize += count*sizeof(struct LO_eckd_data);
      }
      /* Allocate the ccw request. */
      cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
                           cplength, datasize, startdev);
      if (IS_ERR(cqr))
            return cqr;
      ccw = cqr->cpaddr;
      /* First ccw is define extent or prefix. */
      if (use_prefix) {
            if (prefix(ccw++, cqr->data, first_trk,
                     last_trk, cmd, basedev, startdev) == -EAGAIN) {
                  /* Clock not in sync and XRC is enabled.
                   * Try again later.
                   */
                  dasd_sfree_request(cqr, startdev);
                  return ERR_PTR(-EAGAIN);
            }
            idaws = (unsigned long *) (cqr->data +
                                 sizeof(struct PFX_eckd_data));
      } else {
            if (define_extent(ccw++, cqr->data, first_trk,
                          last_trk, cmd, startdev) == -EAGAIN) {
                  /* Clock not in sync and XRC is enabled.
                   * Try again later.
                   */
                  dasd_sfree_request(cqr, startdev);
                  return ERR_PTR(-EAGAIN);
            }
            idaws = (unsigned long *) (cqr->data +
                                 sizeof(struct DE_eckd_data));
      }
      /* Build locate_record+read/write/ccws. */
      LO_data = (struct LO_eckd_data *) (idaws + cidaw);
      recid = first_rec;
      if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
            /* Only standard blocks so there is just one locate record. */
            ccw[-1].flags |= CCW_FLAG_CC;
            locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
                        last_rec - recid + 1, cmd, basedev, blksize);
      }
      rq_for_each_segment(bv, req, iter) {
            dst = page_address(bv->bv_page) + bv->bv_offset;
            if (dasd_page_cache) {
                  char *copy = kmem_cache_alloc(dasd_page_cache,
                                          GFP_DMA | __GFP_NOWARN);
                  if (copy && rq_data_dir(req) == WRITE)
                        memcpy(copy + bv->bv_offset, dst, bv->bv_len);
                  if (copy)
                        dst = copy + bv->bv_offset;
            }
            for (off = 0; off < bv->bv_len; off += blksize) {
                  sector_t trkid = recid;
                  unsigned int recoffs = sector_div(trkid, blk_per_trk);
                  rcmd = cmd;
                  count = blksize;
                  /* Locate record for cdl special block ? */
                  if (private->uses_cdl && recid < 2*blk_per_trk) {
                        if (dasd_eckd_cdl_special(blk_per_trk, recid)){
                              rcmd |= 0x8;
                              count = dasd_eckd_cdl_reclen(recid);
                              if (count < blksize &&
                                  rq_data_dir(req) == READ)
                                    memset(dst + count, 0xe5,
                                           blksize - count);
                        }
                        ccw[-1].flags |= CCW_FLAG_CC;
                        locate_record(ccw++, LO_data++,
                                    trkid, recoffs + 1,
                                    1, rcmd, basedev, count);
                  }
                  /* Locate record for standard blocks ? */
                  if (private->uses_cdl && recid == 2*blk_per_trk) {
                        ccw[-1].flags |= CCW_FLAG_CC;
                        locate_record(ccw++, LO_data++,
                                    trkid, recoffs + 1,
                                    last_rec - recid + 1,
                                    cmd, basedev, count);
                  }
                  /* Read/write ccw. */
                  ccw[-1].flags |= CCW_FLAG_CC;
                  ccw->cmd_code = rcmd;
                  ccw->count = count;
                  if (idal_is_needed(dst, blksize)) {
                        ccw->cda = (__u32)(addr_t) idaws;
                        ccw->flags = CCW_FLAG_IDA;
                        idaws = idal_create_words(idaws, dst, blksize);
                  } else {
                        ccw->cda = (__u32)(addr_t) dst;
                        ccw->flags = 0;
                  }
                  ccw++;
                  dst += blksize;
                  recid++;
            }
      }
      if (blk_noretry_request(req) ||
          block->base->features & DASD_FEATURE_FAILFAST)
            set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
      cqr->startdev = startdev;
      cqr->memdev = startdev;
      cqr->block = block;
      cqr->expires = 5 * 60 * HZ;   /* 5 minutes */
      cqr->lpm = private->path_data.ppm;
      cqr->retries = 256;
      cqr->buildclk = get_clock();
      cqr->status = DASD_CQR_FILLED;
      return cqr;
}

static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
                                     struct dasd_device *startdev,
                                     struct dasd_block *block,
                                     struct request *req,
                                     sector_t first_rec,
                                     sector_t last_rec,
                                     sector_t first_trk,
                                     sector_t last_trk,
                                     unsigned int first_offs,
                                     unsigned int last_offs,
                                     unsigned int blk_per_trk,
                                     unsigned int blksize)
{
      struct dasd_eckd_private *private;
      unsigned long *idaws;
      struct dasd_ccw_req *cqr;
      struct ccw1 *ccw;
      struct req_iterator iter;
      struct bio_vec *bv;
      char *dst, *idaw_dst;
      unsigned int cidaw, cplength, datasize;
      unsigned int tlf;
      sector_t recid;
      unsigned char cmd;
      struct dasd_device *basedev;
      unsigned int trkcount, count, count_to_trk_end;
      unsigned int idaw_len, seg_len, part_len, len_to_track_end;
      unsigned char new_track, end_idaw;
      sector_t trkid;
      unsigned int recoffs;

      basedev = block->base;
      private = (struct dasd_eckd_private *) basedev->private;
      if (rq_data_dir(req) == READ)
            cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
      else if (rq_data_dir(req) == WRITE)
            cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
      else
            return ERR_PTR(-EINVAL);

      /* Track based I/O needs IDAWs for each page, and not just for
       * 64 bit addresses. We need additional idals for pages
       * that get filled from two tracks, so we use the number
       * of records as upper limit.
       */
      cidaw = last_rec - first_rec + 1;
      trkcount = last_trk - first_trk + 1;

      /* 1x prefix + one read/write ccw per track */
      cplength = 1 + trkcount;

      /* on 31-bit we need space for two 32 bit addresses per page
       * on 64-bit one 64 bit address
       */
      datasize = sizeof(struct PFX_eckd_data) +
            cidaw * sizeof(unsigned long long);

      /* Allocate the ccw request. */
      cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
                           cplength, datasize, startdev);
      if (IS_ERR(cqr))
            return cqr;
      ccw = cqr->cpaddr;
      /* transfer length factor: how many bytes to read from the last track */
      if (first_trk == last_trk)
            tlf = last_offs - first_offs + 1;
      else
            tlf = last_offs + 1;
      tlf *= blksize;

      if (prefix_LRE(ccw++, cqr->data, first_trk,
                   last_trk, cmd, basedev, startdev,
                   1 /* format */, first_offs + 1,
                   trkcount, blksize,
                   tlf) == -EAGAIN) {
            /* Clock not in sync and XRC is enabled.
             * Try again later.
             */
            dasd_sfree_request(cqr, startdev);
            return ERR_PTR(-EAGAIN);
      }

      /*
       * The translation of request into ccw programs must meet the
       * following conditions:
       * - all idaws but the first and the last must address full pages
       *   (or 2K blocks on 31-bit)
       * - the scope of a ccw and it's idal ends with the track boundaries
       */
      idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
      recid = first_rec;
      new_track = 1;
      end_idaw = 0;
      len_to_track_end = 0;
      idaw_dst = 0;
      idaw_len = 0;
      rq_for_each_segment(bv, req, iter) {
            dst = page_address(bv->bv_page) + bv->bv_offset;
            seg_len = bv->bv_len;
            while (seg_len) {
                  if (new_track) {
                        trkid = recid;
                        recoffs = sector_div(trkid, blk_per_trk);
                        count_to_trk_end = blk_per_trk - recoffs;
                        count = min((last_rec - recid + 1),
                                  (sector_t)count_to_trk_end);
                        len_to_track_end = count * blksize;
                        ccw[-1].flags |= CCW_FLAG_CC;
                        ccw->cmd_code = cmd;
                        ccw->count = len_to_track_end;
                        ccw->cda = (__u32)(addr_t)idaws;
                        ccw->flags = CCW_FLAG_IDA;
                        ccw++;
                        recid += count;
                        new_track = 0;
                        /* first idaw for a ccw may start anywhere */
                        if (!idaw_dst)
                              idaw_dst = dst;
                  }
                  /* If we start a new idaw, we must make sure that it
                   * starts on an IDA_BLOCK_SIZE boundary.
                   * If we continue an idaw, we must make sure that the
                   * current segment begins where the so far accumulated
                   * idaw ends
                   */
                  if (!idaw_dst) {
                        if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
                              dasd_sfree_request(cqr, startdev);
                              return ERR_PTR(-ERANGE);
                        } else
                              idaw_dst = dst;
                  }
                  if ((idaw_dst + idaw_len) != dst) {
                        dasd_sfree_request(cqr, startdev);
                        return ERR_PTR(-ERANGE);
                  }
                  part_len = min(seg_len, len_to_track_end);
                  seg_len -= part_len;
                  dst += part_len;
                  idaw_len += part_len;
                  len_to_track_end -= part_len;
                  /* collected memory area ends on an IDA_BLOCK border,
                   * -> create an idaw
                   * idal_create_words will handle cases where idaw_len
                   * is larger then IDA_BLOCK_SIZE
                   */
                  if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
                        end_idaw = 1;
                  /* We also need to end the idaw at track end */
                  if (!len_to_track_end) {
                        new_track = 1;
                        end_idaw = 1;
                  }
                  if (end_idaw) {
                        idaws = idal_create_words(idaws, idaw_dst,
                                            idaw_len);
                        idaw_dst = 0;
                        idaw_len = 0;
                        end_idaw = 0;
                  }
            }
      }

      if (blk_noretry_request(req) ||
          block->base->features & DASD_FEATURE_FAILFAST)
            set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
      cqr->startdev = startdev;
      cqr->memdev = startdev;
      cqr->block = block;
      cqr->expires = 5 * 60 * HZ;   /* 5 minutes */
      cqr->lpm = private->path_data.ppm;
      cqr->retries = 256;
      cqr->buildclk = get_clock();
      cqr->status = DASD_CQR_FILLED;
      return cqr;
}

static int prepare_itcw(struct itcw *itcw,
                  unsigned int trk, unsigned int totrk, int cmd,
                  struct dasd_device *basedev,
                  struct dasd_device *startdev,
                  unsigned int rec_on_trk, int count,
                  unsigned int blksize,
                  unsigned int total_data_size,
                  unsigned int tlf,
                  unsigned int blk_per_trk)
{
      struct PFX_eckd_data pfxdata;
      struct dasd_eckd_private *basepriv, *startpriv;
      struct DE_eckd_data *dedata;
      struct LRE_eckd_data *lredata;
      struct dcw *dcw;

      u32 begcyl, endcyl;
      u16 heads, beghead, endhead;
      u8 pfx_cmd;

      int rc = 0;
      int sector = 0;
      int dn, d;


      /* setup prefix data */
      basepriv = (struct dasd_eckd_private *) basedev->private;
      startpriv = (struct dasd_eckd_private *) startdev->private;
      dedata = &pfxdata.define_extent;
      lredata = &pfxdata.locate_record;

      memset(&pfxdata, 0, sizeof(pfxdata));
      pfxdata.format = 1; /* PFX with LRE */
      pfxdata.base_address = basepriv->ned->unit_addr;
      pfxdata.base_lss = basepriv->ned->ID;
      pfxdata.validity.define_extent = 1;

      /* private uid is kept up to date, conf_data may be outdated */
      if (startpriv->uid.type != UA_BASE_DEVICE) {
            pfxdata.validity.verify_base = 1;
            if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
                  pfxdata.validity.hyper_pav = 1;
      }

      switch (cmd) {
      case DASD_ECKD_CCW_READ_TRACK_DATA:
            dedata->mask.perm = 0x1;
            dedata->attributes.operation = basepriv->attrib.operation;
            dedata->blk_size = blksize;
            dedata->ga_extended |= 0x42;
            lredata->operation.orientation = 0x0;
            lredata->operation.operation = 0x0C;
            lredata->auxiliary.check_bytes = 0x01;
            pfx_cmd = DASD_ECKD_CCW_PFX_READ;
            break;
      case DASD_ECKD_CCW_WRITE_TRACK_DATA:
            dedata->mask.perm = 0x02;
            dedata->attributes.operation = basepriv->attrib.operation;
            dedata->blk_size = blksize;
            rc = check_XRC_on_prefix(&pfxdata, basedev);
            dedata->ga_extended |= 0x42;
            lredata->operation.orientation = 0x0;
            lredata->operation.operation = 0x3F;
            lredata->extended_operation = 0x23;
            lredata->auxiliary.check_bytes = 0x2;
            pfx_cmd = DASD_ECKD_CCW_PFX;
            break;
      default:
            DBF_DEV_EVENT(DBF_ERR, basedev,
                        "prepare itcw, unknown opcode 0x%x", cmd);
            BUG();
            break;
      }
      if (rc)
            return rc;

      dedata->attributes.mode = 0x3;      /* ECKD */

      heads = basepriv->rdc_data.trk_per_cyl;
      begcyl = trk / heads;
      beghead = trk % heads;
      endcyl = totrk / heads;
      endhead = totrk % heads;

      /* check for sequential prestage - enhance cylinder range */
      if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
          dedata->attributes.operation == DASD_SEQ_ACCESS) {

            if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
                  endcyl += basepriv->attrib.nr_cyl;
            else
                  endcyl = (basepriv->real_cyl - 1);
      }

      set_ch_t(&dedata->beg_ext, begcyl, beghead);
      set_ch_t(&dedata->end_ext, endcyl, endhead);

      dedata->ep_format = 0x20; /* records per track is valid */
      dedata->ep_rec_per_track = blk_per_trk;

      if (rec_on_trk) {
            switch (basepriv->rdc_data.dev_type) {
            case 0x3390:
                  dn = ceil_quot(blksize + 6, 232);
                  d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
                  sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
                  break;
            case 0x3380:
                  d = 7 + ceil_quot(blksize + 12, 32);
                  sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
                  break;
            }
      }

      lredata->auxiliary.length_valid = 1;
      lredata->auxiliary.length_scope = 1;
      lredata->auxiliary.imbedded_ccw_valid = 1;
      lredata->length = tlf;
      lredata->imbedded_ccw = cmd;
      lredata->count = count;
      lredata->sector = sector;
      set_ch_t(&lredata->seek_addr, begcyl, beghead);
      lredata->search_arg.cyl = lredata->seek_addr.cyl;
      lredata->search_arg.head = lredata->seek_addr.head;
      lredata->search_arg.record = rec_on_trk;

      dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
                 &pfxdata, sizeof(pfxdata), total_data_size);

      return rc;
}

static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
                                     struct dasd_device *startdev,
                                     struct dasd_block *block,
                                     struct request *req,
                                     sector_t first_rec,
                                     sector_t last_rec,
                                     sector_t first_trk,
                                     sector_t last_trk,
                                     unsigned int first_offs,
                                     unsigned int last_offs,
                                     unsigned int blk_per_trk,
                                     unsigned int blksize)
{
      struct dasd_eckd_private *private;
      struct dasd_ccw_req *cqr;
      struct req_iterator iter;
      struct bio_vec *bv;
      char *dst;
      unsigned int trkcount, ctidaw;
      unsigned char cmd;
      struct dasd_device *basedev;
      unsigned int tlf;
      struct itcw *itcw;
      struct tidaw *last_tidaw = NULL;
      int itcw_op;
      size_t itcw_size;

      basedev = block->base;
      private = (struct dasd_eckd_private *) basedev->private;
      if (rq_data_dir(req) == READ) {
            cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
            itcw_op = ITCW_OP_READ;
      } else if (rq_data_dir(req) == WRITE) {
            cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
            itcw_op = ITCW_OP_WRITE;
      } else
            return ERR_PTR(-EINVAL);

      /* trackbased I/O needs address all memory via TIDAWs,
       * not just for 64 bit addresses. This allows us to map
       * each segment directly to one tidaw.
       */
      trkcount = last_trk - first_trk + 1;
      ctidaw = 0;
      rq_for_each_segment(bv, req, iter) {
            ++ctidaw;
      }

      /* Allocate the ccw request. */
      itcw_size = itcw_calc_size(0, ctidaw, 0);
      cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
                           0, itcw_size, startdev);
      if (IS_ERR(cqr))
            return cqr;

      cqr->cpmode = 1;
      cqr->startdev = startdev;
      cqr->memdev = startdev;
      cqr->block = block;
      cqr->expires = 100*HZ;
      cqr->buildclk = get_clock();
      cqr->status = DASD_CQR_FILLED;
      cqr->retries = 10;

      /* transfer length factor: how many bytes to read from the last track */
      if (first_trk == last_trk)
            tlf = last_offs - first_offs + 1;
      else
            tlf = last_offs + 1;
      tlf *= blksize;

      itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
      cqr->cpaddr = itcw_get_tcw(itcw);

      if (prepare_itcw(itcw, first_trk, last_trk,
                   cmd, basedev, startdev,
                   first_offs + 1,
                   trkcount, blksize,
                   (last_rec - first_rec + 1) * blksize,
                   tlf, blk_per_trk) == -EAGAIN) {
            /* Clock not in sync and XRC is enabled.
             * Try again later.
             */
            dasd_sfree_request(cqr, startdev);
            return ERR_PTR(-EAGAIN);
      }

      /*
       * A tidaw can address 4k of memory, but must not cross page boundaries
       * We can let the block layer handle this by setting
       * blk_queue_segment_boundary to page boundaries and
       * blk_max_segment_size to page size when setting up the request queue.
       */
      rq_for_each_segment(bv, req, iter) {
            dst = page_address(bv->bv_page) + bv->bv_offset;
            last_tidaw = itcw_add_tidaw(itcw, 0x00, dst, bv->bv_len);
            if (IS_ERR(last_tidaw))
                  return (struct dasd_ccw_req *)last_tidaw;
      }

      last_tidaw->flags |= 0x80;
      itcw_finalize(itcw);

      if (blk_noretry_request(req) ||
          block->base->features & DASD_FEATURE_FAILFAST)
            set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
      cqr->startdev = startdev;
      cqr->memdev = startdev;
      cqr->block = block;
      cqr->expires = 5 * 60 * HZ;   /* 5 minutes */
      cqr->lpm = private->path_data.ppm;
      cqr->retries = 256;
      cqr->buildclk = get_clock();
      cqr->status = DASD_CQR_FILLED;
      return cqr;
}

static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
                                     struct dasd_block *block,
                                     struct request *req)
{
      int tpm, cmdrtd, cmdwtd;
      int use_prefix;
#if defined(CONFIG_64BIT)
      int fcx_in_css, fcx_in_gneq, fcx_in_features;
#endif
      struct dasd_eckd_private *private;
      struct dasd_device *basedev;
      sector_t first_rec, last_rec;
      sector_t first_trk, last_trk;
      unsigned int first_offs, last_offs;
      unsigned int blk_per_trk, blksize;
      int cdlspecial;
      struct dasd_ccw_req *cqr;

      basedev = block->base;
      private = (struct dasd_eckd_private *) basedev->private;

      /* Calculate number of blocks/records per track. */
      blksize = block->bp_block;
      blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
      /* Calculate record id of first and last block. */
      first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
      first_offs = sector_div(first_trk, blk_per_trk);
      last_rec = last_trk =
            (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
      last_offs = sector_div(last_trk, blk_per_trk);
      cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);

      /* is transport mode supported? */
#if defined(CONFIG_64BIT)
      fcx_in_css = css_general_characteristics.fcx;
      fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
      fcx_in_features = private->features.feature[40] & 0x80;
      tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
#else
      tpm = 0;
#endif

      /* is read track data and write track data in command mode supported? */
      cmdrtd = private->features.feature[9] & 0x20;
      cmdwtd = private->features.feature[12] & 0x40;
      use_prefix = private->features.feature[8] & 0x01;

      cqr = NULL;
      if (cdlspecial || dasd_page_cache) {
            /* do nothing, just fall through to the cmd mode single case */
      } else if (!dasd_nofcx && tpm && (first_trk == last_trk)) {
            cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
                                        first_rec, last_rec,
                                        first_trk, last_trk,
                                        first_offs, last_offs,
                                        blk_per_trk, blksize);
            if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
                  cqr = NULL;
      } else if (use_prefix &&
               (((rq_data_dir(req) == READ) && cmdrtd) ||
                ((rq_data_dir(req) == WRITE) && cmdwtd))) {
            cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
                                       first_rec, last_rec,
                                       first_trk, last_trk,
                                       first_offs, last_offs,
                                       blk_per_trk, blksize);
            if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
                  cqr = NULL;
      }
      if (!cqr)
            cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
                                        first_rec, last_rec,
                                        first_trk, last_trk,
                                        first_offs, last_offs,
                                        blk_per_trk, blksize);
      return cqr;
}

static int
dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
{
      struct dasd_eckd_private *private;
      struct ccw1 *ccw;
      struct req_iterator iter;
      struct bio_vec *bv;
      char *dst, *cda;
      unsigned int blksize, blk_per_trk, off;
      sector_t recid;
      int status;

      if (!dasd_page_cache)
            goto out;
      private = (struct dasd_eckd_private *) cqr->block->base->private;
      blksize = cqr->block->bp_block;
      blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
      recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
      ccw = cqr->cpaddr;
      /* Skip over define extent & locate record. */
      ccw++;
      if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
            ccw++;
      rq_for_each_segment(bv, req, iter) {
            dst = page_address(bv->bv_page) + bv->bv_offset;
            for (off = 0; off < bv->bv_len; off += blksize) {
                  /* Skip locate record. */
                  if (private->uses_cdl && recid <= 2*blk_per_trk)
                        ccw++;
                  if (dst) {
                        if (ccw->flags & CCW_FLAG_IDA)
                              cda = *((char **)((addr_t) ccw->cda));
                        else
                              cda = (char *)((addr_t) ccw->cda);
                        if (dst != cda) {
                              if (rq_data_dir(req) == READ)
                                    memcpy(dst, cda, bv->bv_len);
                              kmem_cache_free(dasd_page_cache,
                                  (void *)((addr_t)cda & PAGE_MASK));
                        }
                        dst = NULL;
                  }
                  ccw++;
                  recid++;
            }
      }
out:
      status = cqr->status == DASD_CQR_DONE;
      dasd_sfree_request(cqr, cqr->memdev);
      return status;
}

/*
 * Modify ccw/tcw in cqr so it can be started on a base device.
 *
 * Note that this is not enough to restart the cqr!
 * Either reset cqr->startdev as well (summary unit check handling)
 * or restart via separate cqr (as in ERP handling).
 */
void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
{
      struct ccw1 *ccw;
      struct PFX_eckd_data *pfxdata;
      struct tcw *tcw;
      struct tccb *tccb;
      struct dcw *dcw;

      if (cqr->cpmode == 1) {
            tcw = cqr->cpaddr;
            tccb = tcw_get_tccb(tcw);
            dcw = (struct dcw *)&tccb->tca[0];
            pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
            pfxdata->validity.verify_base = 0;
            pfxdata->validity.hyper_pav = 0;
      } else {
            ccw = cqr->cpaddr;
            pfxdata = cqr->data;
            if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
                  pfxdata->validity.verify_base = 0;
                  pfxdata->validity.hyper_pav = 0;
            }
      }
}

#define DASD_ECKD_CHANQ_MAX_SIZE 4

static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
                                         struct dasd_block *block,
                                         struct request *req)
{
      struct dasd_eckd_private *private;
      struct dasd_device *startdev;
      unsigned long flags;
      struct dasd_ccw_req *cqr;

      startdev = dasd_alias_get_start_dev(base);
      if (!startdev)
            startdev = base;
      private = (struct dasd_eckd_private *) startdev->private;
      if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
            return ERR_PTR(-EBUSY);

      spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
      private->count++;
      cqr = dasd_eckd_build_cp(startdev, block, req);
      if (IS_ERR(cqr))
            private->count--;
      spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
      return cqr;
}

static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
                           struct request *req)
{
      struct dasd_eckd_private *private;
      unsigned long flags;

      spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
      private = (struct dasd_eckd_private *) cqr->memdev->private;
      private->count--;
      spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
      return dasd_eckd_free_cp(cqr, req);
}

static int
dasd_eckd_fill_info(struct dasd_device * device,
                struct dasd_information2_t * info)
{
      struct dasd_eckd_private *private;

      private = (struct dasd_eckd_private *) device->private;
      info->label_block = 2;
      info->FBA_layout = private->uses_cdl ? 0 : 1;
      info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
      info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
      memcpy(info->characteristics, &private->rdc_data,
             sizeof(struct dasd_eckd_characteristics));
      info->confdata_size = min((unsigned long)private->conf_len,
                          sizeof(info->configuration_data));
      memcpy(info->configuration_data, private->conf_data,
             info->confdata_size);
      return 0;
}

/*
 * SECTION: ioctl functions for eckd devices.
 */

/*
 * Release device ioctl.
 * Buils a channel programm to releases a prior reserved
 * (see dasd_eckd_reserve) device.
 */
static int
dasd_eckd_release(struct dasd_device *device)
{
      struct dasd_ccw_req *cqr;
      int rc;
      struct ccw1 *ccw;

      if (!capable(CAP_SYS_ADMIN))
            return -EACCES;

      cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
                           1, 32, device);
      if (IS_ERR(cqr)) {
            DBF_DEV_EVENT(DBF_WARNING, device, "%s",
                      "Could not allocate initialization request");
            return PTR_ERR(cqr);
      }
      ccw = cqr->cpaddr;
      ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
      ccw->flags |= CCW_FLAG_SLI;
      ccw->count = 32;
      ccw->cda = (__u32)(addr_t) cqr->data;
      cqr->startdev = device;
      cqr->memdev = device;
      clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
      set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
      cqr->retries = 2; /* set retry counter to enable basic ERP */
      cqr->expires = 2 * HZ;
      cqr->buildclk = get_clock();
      cqr->status = DASD_CQR_FILLED;

      rc = dasd_sleep_on_immediatly(cqr);

      dasd_sfree_request(cqr, cqr->memdev);
      return rc;
}

/*
 * Reserve device ioctl.
 * Options are set to 'synchronous wait for interrupt' and
 * 'timeout the request'. This leads to a terminate IO if
 * the interrupt is outstanding for a certain time.
 */
static int
dasd_eckd_reserve(struct dasd_device *device)
{
      struct dasd_ccw_req *cqr;
      int rc;
      struct ccw1 *ccw;

      if (!capable(CAP_SYS_ADMIN))
            return -EACCES;

      cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
                           1, 32, device);
      if (IS_ERR(cqr)) {
            DBF_DEV_EVENT(DBF_WARNING, device, "%s",
                      "Could not allocate initialization request");
            return PTR_ERR(cqr);
      }
      ccw = cqr->cpaddr;
      ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
      ccw->flags |= CCW_FLAG_SLI;
      ccw->count = 32;
      ccw->cda = (__u32)(addr_t) cqr->data;
      cqr->startdev = device;
      cqr->memdev = device;
      clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
      set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
      cqr->retries = 2; /* set retry counter to enable basic ERP */
      cqr->expires = 2 * HZ;
      cqr->buildclk = get_clock();
      cqr->status = DASD_CQR_FILLED;

      rc = dasd_sleep_on_immediatly(cqr);

      dasd_sfree_request(cqr, cqr->memdev);
      return rc;
}

/*
 * Steal lock ioctl - unconditional reserve device.
 * Buils a channel programm to break a device's reservation.
 * (unconditional reserve)
 */
static int
dasd_eckd_steal_lock(struct dasd_device *device)
{
      struct dasd_ccw_req *cqr;
      int rc;
      struct ccw1 *ccw;

      if (!capable(CAP_SYS_ADMIN))
            return -EACCES;

      cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
                           1, 32, device);
      if (IS_ERR(cqr)) {
            DBF_DEV_EVENT(DBF_WARNING, device, "%s",
                      "Could not allocate initialization request");
            return PTR_ERR(cqr);
      }
      ccw = cqr->cpaddr;
      ccw->cmd_code = DASD_ECKD_CCW_SLCK;
      ccw->flags |= CCW_FLAG_SLI;
      ccw->count = 32;
      ccw->cda = (__u32)(addr_t) cqr->data;
      cqr->startdev = device;
      cqr->memdev = device;
      clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
      set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
      cqr->retries = 2; /* set retry counter to enable basic ERP */
      cqr->expires = 2 * HZ;
      cqr->buildclk = get_clock();
      cqr->status = DASD_CQR_FILLED;

      rc = dasd_sleep_on_immediatly(cqr);

      dasd_sfree_request(cqr, cqr->memdev);
      return rc;
}

/*
 * Read performance statistics
 */
static int
dasd_eckd_performance(struct dasd_device *device, void __user *argp)
{
      struct dasd_psf_prssd_data *prssdp;
      struct dasd_rssd_perf_stats_t *stats;
      struct dasd_ccw_req *cqr;
      struct ccw1 *ccw;
      int rc;

      cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
                           1 /* PSF */  + 1 /* RSSD */ ,
                           (sizeof(struct dasd_psf_prssd_data) +
                            sizeof(struct dasd_rssd_perf_stats_t)),
                           device);
      if (IS_ERR(cqr)) {
            DBF_DEV_EVENT(DBF_WARNING, device, "%s",
                      "Could not allocate initialization request");
            return PTR_ERR(cqr);
      }
      cqr->startdev = device;
      cqr->memdev = device;
      cqr->retries = 0;
      cqr->expires = 10 * HZ;

      /* Prepare for Read Subsystem Data */
      prssdp = (struct dasd_psf_prssd_data *) cqr->data;
      memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
      prssdp->order = PSF_ORDER_PRSSD;
      prssdp->suborder = 0x01;      /* Performance Statistics */
      prssdp->varies[1] = 0x01;     /* Perf Statistics for the Subsystem */

      ccw = cqr->cpaddr;
      ccw->cmd_code = DASD_ECKD_CCW_PSF;
      ccw->count = sizeof(struct dasd_psf_prssd_data);
      ccw->flags |= CCW_FLAG_CC;
      ccw->cda = (__u32)(addr_t) prssdp;

      /* Read Subsystem Data - Performance Statistics */
      stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
      memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));

      ccw++;
      ccw->cmd_code = DASD_ECKD_CCW_RSSD;
      ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
      ccw->cda = (__u32)(addr_t) stats;

      cqr->buildclk = get_clock();
      cqr->status = DASD_CQR_FILLED;
      rc = dasd_sleep_on(cqr);
      if (rc == 0) {
            prssdp = (struct dasd_psf_prssd_data *) cqr->data;
            stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
            if (copy_to_user(argp, stats,
                         sizeof(struct dasd_rssd_perf_stats_t)))
                  rc = -EFAULT;
      }
      dasd_sfree_request(cqr, cqr->memdev);
      return rc;
}

/*
 * Get attributes (cache operations)
 * Returnes the cache attributes used in Define Extend (DE).
 */
static int
dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
{
      struct dasd_eckd_private *private =
            (struct dasd_eckd_private *)device->private;
      struct attrib_data_t attrib = private->attrib;
      int rc;

        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;
      if (!argp)
                return -EINVAL;

      rc = 0;
      if (copy_to_user(argp, (long *) &attrib,
                   sizeof(struct attrib_data_t)))
            rc = -EFAULT;

      return rc;
}

/*
 * Set attributes (cache operations)
 * Stores the attributes for cache operation to be used in Define Extend (DE).
 */
static int
dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
{
      struct dasd_eckd_private *private =
            (struct dasd_eckd_private *)device->private;
      struct attrib_data_t attrib;

      if (!capable(CAP_SYS_ADMIN))
            return -EACCES;
      if (!argp)
            return -EINVAL;

      if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
            return -EFAULT;
      private->attrib = attrib;

      dev_info(&device->cdev->dev,
             "The DASD cache mode was set to %x (%i cylinder prestage)\n",
             private->attrib.operation, private->attrib.nr_cyl);
      return 0;
}

/*
 * Issue syscall I/O to EMC Symmetrix array.
 * CCWs are PSF and RSSD
 */
static int dasd_symm_io(struct dasd_device *device, void __user *argp)
{
      struct dasd_symmio_parms usrparm;
      char *psf_data, *rssd_result;
      struct dasd_ccw_req *cqr;
      struct ccw1 *ccw;
      int rc;

      /* Copy parms from caller */
      rc = -EFAULT;
      if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
            goto out;
#ifndef CONFIG_64BIT
      /* Make sure pointers are sane even on 31 bit. */
      if ((usrparm.psf_data >> 32) != 0 || (usrparm.rssd_result >> 32) != 0) {
            rc = -EINVAL;
            goto out;
      }
#endif
      /* alloc I/O data area */
      psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
      rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
      if (!psf_data || !rssd_result) {
            rc = -ENOMEM;
            goto out_free;
      }

      /* get syscall header from user space */
      rc = -EFAULT;
      if (copy_from_user(psf_data,
                     (void __user *)(unsigned long) usrparm.psf_data,
                     usrparm.psf_data_len))
            goto out_free;

      /* sanity check on syscall header */
      if (psf_data[0] != 0x17 && psf_data[1] != 0xce) {
            rc = -EINVAL;
            goto out_free;
      }

      /* setup CCWs for PSF + RSSD */
      cqr = dasd_smalloc_request("ECKD", 2 , 0, device);
      if (IS_ERR(cqr)) {
            DBF_DEV_EVENT(DBF_WARNING, device, "%s",
                  "Could not allocate initialization request");
            rc = PTR_ERR(cqr);
            goto out_free;
      }

      cqr->startdev = device;
      cqr->memdev = device;
      cqr->retries = 3;
      cqr->expires = 10 * HZ;
      cqr->buildclk = get_clock();
      cqr->status = DASD_CQR_FILLED;

      /* Build the ccws */
      ccw = cqr->cpaddr;

      /* PSF ccw */
      ccw->cmd_code = DASD_ECKD_CCW_PSF;
      ccw->count = usrparm.psf_data_len;
      ccw->flags |= CCW_FLAG_CC;
      ccw->cda = (__u32)(addr_t) psf_data;

      ccw++;

      /* RSSD ccw  */
      ccw->cmd_code = DASD_ECKD_CCW_RSSD;
      ccw->count = usrparm.rssd_result_len;
      ccw->flags = CCW_FLAG_SLI ;
      ccw->cda = (__u32)(addr_t) rssd_result;

      rc = dasd_sleep_on(cqr);
      if (rc)
            goto out_sfree;

      rc = -EFAULT;
      if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
                     rssd_result, usrparm.rssd_result_len))
            goto out_sfree;
      rc = 0;

out_sfree:
      dasd_sfree_request(cqr, cqr->memdev);
out_free:
      kfree(rssd_result);
      kfree(psf_data);
out:
      DBF_DEV_EVENT(DBF_WARNING, device, "Symmetrix ioctl: rc=%d", rc);
      return rc;
}

static int
dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
{
      struct dasd_device *device = block->base;

      switch (cmd) {
      case BIODASDGATTR:
            return dasd_eckd_get_attrib(device, argp);
      case BIODASDSATTR:
            return dasd_eckd_set_attrib(device, argp);
      case BIODASDPSRD:
            return dasd_eckd_performance(device, argp);
      case BIODASDRLSE:
            return dasd_eckd_release(device);
      case BIODASDRSRV:
            return dasd_eckd_reserve(device);
      case BIODASDSLCK:
            return dasd_eckd_steal_lock(device);
      case BIODASDSYMMIO:
            return dasd_symm_io(device, argp);
      default:
            return -ENOIOCTLCMD;
      }
}

/*
 * Dump the range of CCWs into 'page' buffer
 * and return number of printed chars.
 */
static int
dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
{
      int len, count;
      char *datap;

      len = 0;
      while (from <= to) {
            len += sprintf(page + len, KERN_ERR PRINTK_HEADER
                         " CCW %p: %08X %08X DAT:",
                         from, ((int *) from)[0], ((int *) from)[1]);

            /* get pointer to data (consider IDALs) */
            if (from->flags & CCW_FLAG_IDA)
                  datap = (char *) *((addr_t *) (addr_t) from->cda);
            else
                  datap = (char *) ((addr_t) from->cda);

            /* dump data (max 32 bytes) */
            for (count = 0; count < from->count && count < 32; count++) {
                  if (count % 8 == 0) len += sprintf(page + len, " ");
                  if (count % 4 == 0) len += sprintf(page + len, " ");
                  len += sprintf(page + len, "%02x", datap[count]);
            }
            len += sprintf(page + len, "\n");
            from++;
      }
      return len;
}

static void
dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
                   char *reason)
{
      u64 *sense;

      sense = (u64 *) dasd_get_sense(irb);
      if (sense) {
            DBF_DEV_EVENT(DBF_EMERG, device,
                        "%s: %s %02x%02x%02x %016llx %016llx %016llx "
                        "%016llx", reason,
                        scsw_is_tm(&irb->scsw) ? "t" : "c",
                        scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw),
                        scsw_dstat(&irb->scsw), sense[0], sense[1],
                        sense[2], sense[3]);
      } else {
            DBF_DEV_EVENT(DBF_EMERG, device, "%s",
                        "SORRY - NO VALID SENSE AVAILABLE\n");
      }
}

/*
 * Print sense data and related channel program.
 * Parts are printed because printk buffer is only 1024 bytes.
 */
static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
                         struct dasd_ccw_req *req, struct irb *irb)
{
      char *page;
      struct ccw1 *first, *last, *fail, *from, *to;
      int len, sl, sct;

      page = (char *) get_zeroed_page(GFP_ATOMIC);
      if (page == NULL) {
            DBF_DEV_EVENT(DBF_WARNING, device, "%s",
                        "No memory to dump sense data\n");
            return;
      }
      /* dump the sense data */
      len = sprintf(page,  KERN_ERR PRINTK_HEADER
                  " I/O status report for device %s:\n",
                  dev_name(&device->cdev->dev));
      len += sprintf(page + len, KERN_ERR PRINTK_HEADER
                   " in req: %p CS: 0x%02X DS: 0x%02X CC: 0x%02X RC: %d\n",
                   req, scsw_cstat(&irb->scsw), scsw_dstat(&irb->scsw),
                   scsw_cc(&irb->scsw), req->intrc);
      len += sprintf(page + len, KERN_ERR PRINTK_HEADER
                   " device %s: Failing CCW: %p\n",
                   dev_name(&device->cdev->dev),
                   (void *) (addr_t) irb->scsw.cmd.cpa);
      if (irb->esw.esw0.erw.cons) {
            for (sl = 0; sl < 4; sl++) {
                  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
                               " Sense(hex) %2d-%2d:",
                               (8 * sl), ((8 * sl) + 7));

                  for (sct = 0; sct < 8; sct++) {
                        len += sprintf(page + len, " %02x",
                                     irb->ecw[8 * sl + sct]);
                  }
                  len += sprintf(page + len, "\n");
            }

            if (irb->ecw[27] & DASD_SENSE_BIT_0) {
                  /* 24 Byte Sense Data */
                  sprintf(page + len, KERN_ERR PRINTK_HEADER
                        " 24 Byte: %x MSG %x, "
                        "%s MSGb to SYSOP\n",
                        irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
                        irb->ecw[1] & 0x10 ? "" : "no");
            } else {
                  /* 32 Byte Sense Data */
                  sprintf(page + len, KERN_ERR PRINTK_HEADER
                        " 32 Byte: Format: %x "
                        "Exception class %x\n",
                        irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
            }
      } else {
            sprintf(page + len, KERN_ERR PRINTK_HEADER
                  " SORRY - NO VALID SENSE AVAILABLE\n");
      }
      printk("%s", page);

      if (req) {
            /* req == NULL for unsolicited interrupts */
            /* dump the Channel Program (max 140 Bytes per line) */
            /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
            first = req->cpaddr;
            for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
            to = min(first + 6, last);
            len = sprintf(page,  KERN_ERR PRINTK_HEADER
                        " Related CP in req: %p\n", req);
            dasd_eckd_dump_ccw_range(first, to, page + len);
            printk("%s", page);

            /* print failing CCW area (maximum 4) */
            /* scsw->cda is either valid or zero  */
            len = 0;
            from = ++to;
            fail = (struct ccw1 *)(addr_t)
                        irb->scsw.cmd.cpa; /* failing CCW */
            if (from <  fail - 2) {
                  from = fail - 2;     /* there is a gap - print header */
                  len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
            }
            to = min(fail + 1, last);
            len += dasd_eckd_dump_ccw_range(from, to, page + len);

            /* print last CCWs (maximum 2) */
            from = max(from, ++to);
            if (from < last - 1) {
                  from = last - 1;     /* there is a gap - print header */
                  len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
            }
            len += dasd_eckd_dump_ccw_range(from, last, page + len);
            if (len > 0)
                  printk("%s", page);
      }
      free_page((unsigned long) page);
}


/*
 * Print sense data from a tcw.
 */
static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
                         struct dasd_ccw_req *req, struct irb *irb)
{
      char *page;
      int len, sl, sct, residual;

      struct tsb *tsb;
      u8 *sense;


      page = (char *) get_zeroed_page(GFP_ATOMIC);
      if (page == NULL) {
            DBF_DEV_EVENT(DBF_WARNING, device, " %s",
                      "No memory to dump sense data");
            return;
      }
      /* dump the sense data */
      len = sprintf(page,  KERN_ERR PRINTK_HEADER
                  " I/O status report for device %s:\n",
                  dev_name(&device->cdev->dev));
      len += sprintf(page + len, KERN_ERR PRINTK_HEADER
                   " in req: %p CS: 0x%02X DS: 0x%02X CC: 0x%02X RC: %d "
                   "fcxs: 0x%02X schxs: 0x%02X\n", req,
                   scsw_cstat(&irb->scsw), scsw_dstat(&irb->scsw),
                   scsw_cc(&irb->scsw), req->intrc,
                   irb->scsw.tm.fcxs, irb->scsw.tm.schxs);
      len += sprintf(page + len, KERN_ERR PRINTK_HEADER
                   " device %s: Failing TCW: %p\n",
                   dev_name(&device->cdev->dev),
                   (void *) (addr_t) irb->scsw.tm.tcw);

      tsb = NULL;
      sense = NULL;
      if (irb->scsw.tm.tcw)
            tsb = tcw_get_tsb(
                  (struct tcw *)(unsigned long)irb->scsw.tm.tcw);

      if (tsb && (irb->scsw.tm.fcxs == 0x01)) {
            len += sprintf(page + len, KERN_ERR PRINTK_HEADER
                         " tsb->length %d\n", tsb->length);
            len += sprintf(page + len, KERN_ERR PRINTK_HEADER
                         " tsb->flags %x\n", tsb->flags);
            len += sprintf(page + len, KERN_ERR PRINTK_HEADER
                         " tsb->dcw_offset %d\n", tsb->dcw_offset);
            len += sprintf(page + len, KERN_ERR PRINTK_HEADER
                         " tsb->count %d\n", tsb->count);
            residual = tsb->count - 28;
            len += sprintf(page + len, KERN_ERR PRINTK_HEADER
                         " residual %d\n", residual);

            switch (tsb->flags & 0x07) {
            case 1:     /* tsa_iostat */
                  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
                         " tsb->tsa.iostat.dev_time %d\n",
                               tsb->tsa.iostat.dev_time);
                  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
                         " tsb->tsa.iostat.def_time %d\n",
                               tsb->tsa.iostat.def_time);
                  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
                         " tsb->tsa.iostat.queue_time %d\n",
                               tsb->tsa.iostat.queue_time);
                  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
                         " tsb->tsa.iostat.dev_busy_time %d\n",
                               tsb->tsa.iostat.dev_busy_time);
                  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
                         " tsb->tsa.iostat.dev_act_time %d\n",
                               tsb->tsa.iostat.dev_act_time);
                  sense = tsb->tsa.iostat.sense;
                  break;
            case 2: /* ts_ddpc */
                  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
                         " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
                  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
                         " tsb->tsa.ddpc.rcq:  ");
                  for (sl = 0; sl < 16; sl++) {
                        for (sct = 0; sct < 8; sct++) {
                              len += sprintf(page + len, " %02x",
                                           tsb->tsa.ddpc.rcq[sl]);
                        }
                        len += sprintf(page + len, "\n");
                  }
                  sense = tsb->tsa.ddpc.sense;
                  break;
            case 3: /* tsa_intrg */
                  len += sprintf(page + len, KERN_ERR PRINTK_HEADER
                              " tsb->tsa.intrg.: not supportet yet \n");
                  break;
            }

            if (sense) {
                  for (sl = 0; sl < 4; sl++) {
                        len += sprintf(page + len,
                                     KERN_ERR PRINTK_HEADER
                                     " Sense(hex) %2d-%2d:",
                                     (8 * sl), ((8 * sl) + 7));
                        for (sct = 0; sct < 8; sct++) {
                              len += sprintf(page + len, " %02x",
                                           sense[8 * sl + sct]);
                        }
                        len += sprintf(page + len, "\n");
                  }

                  if (sense[27] & DASD_SENSE_BIT_0) {
                        /* 24 Byte Sense Data */
                        sprintf(page + len, KERN_ERR PRINTK_HEADER
                              " 24 Byte: %x MSG %x, "
                              "%s MSGb to SYSOP\n",
                              sense[7] >> 4, sense[7] & 0x0f,
                              sense[1] & 0x10 ? "" : "no");
                  } else {
                        /* 32 Byte Sense Data */
                        sprintf(page + len, KERN_ERR PRINTK_HEADER
                              " 32 Byte: Format: %x "
                              "Exception class %x\n",
                              sense[6] & 0x0f, sense[22] >> 4);
                  }
            } else {
                  sprintf(page + len, KERN_ERR PRINTK_HEADER
                        " SORRY - NO VALID SENSE AVAILABLE\n");
            }
      } else {
            sprintf(page + len, KERN_ERR PRINTK_HEADER
                  " SORRY - NO TSB DATA AVAILABLE\n");
      }
      printk("%s", page);
      free_page((unsigned long) page);
}

static void dasd_eckd_dump_sense(struct dasd_device *device,
                         struct dasd_ccw_req *req, struct irb *irb)
{
      if (req && scsw_is_tm(&req->irb.scsw))
            dasd_eckd_dump_sense_tcw(device, req, irb);
      else
            dasd_eckd_dump_sense_ccw(device, req, irb);
}

int dasd_eckd_pm_freeze(struct dasd_device *device)
{
      /*
       * the device should be disconnected from our LCU structure
       * on restore we will reconnect it and reread LCU specific
       * information like PAV support that might have changed
       */
      dasd_alias_remove_device(device);
      dasd_alias_disconnect_device_from_lcu(device);

      return 0;
}

int dasd_eckd_restore_device(struct dasd_device *device)
{
      struct dasd_eckd_private *private;
      int is_known, rc;
      struct dasd_uid temp_uid;

      private = (struct dasd_eckd_private *) device->private;

      /* Read Configuration Data */
      rc = dasd_eckd_read_conf(device);
      if (rc)
            goto out_err;

      /* Generate device unique id and register in devmap */
      rc = dasd_eckd_generate_uid(device, &private->uid);
      dasd_get_uid(device->cdev, &temp_uid);
      if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
            dev_err(&device->cdev->dev, "The UID of the DASD has changed\n");
      if (rc)
            goto out_err;
      dasd_set_uid(device->cdev, &private->uid);

      /* register lcu with alias handling, enable PAV if this is a new lcu */
      is_known = dasd_alias_make_device_known_to_lcu(device);
      if (is_known < 0)
            return is_known;
      if (!is_known) {
            /* new lcu found */
            rc = dasd_eckd_validate_server(device); /* will switch pav on */
            if (rc)
                  goto out_err;
      }

      /* Read Feature Codes */
      rc = dasd_eckd_read_features(device);
      if (rc)
            goto out_err;

      /* Read Device Characteristics */
      memset(&private->rdc_data, 0, sizeof(private->rdc_data));
      rc = dasd_generic_read_dev_chars(device, "ECKD",
                               &private->rdc_data, 64);
      if (rc) {
            DBF_EVENT(DBF_WARNING,
                    "Read device characteristics failed, rc=%d for "
                    "device: %s", rc, dev_name(&device->cdev->dev));
            goto out_err;
      }

      /* add device to alias management */
      dasd_alias_add_device(device);

      return 0;

out_err:
      return -1;
}

static struct ccw_driver dasd_eckd_driver = {
      .name      = "dasd-eckd",
      .owner           = THIS_MODULE,
      .ids       = dasd_eckd_ids,
      .probe           = dasd_eckd_probe,
      .remove      = dasd_generic_remove,
      .set_offline = dasd_generic_set_offline,
      .set_online  = dasd_eckd_set_online,
      .notify      = dasd_generic_notify,
      .freeze      = dasd_generic_pm_freeze,
      .thaw      = dasd_generic_restore_device,
      .restore     = dasd_generic_restore_device,
};

/*
 * max_blocks is dependent on the amount of storage that is available
 * in the static io buffer for each device. Currently each device has
 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
 * addition we have one define extent ccw + 16 bytes of data and one
 * locate record ccw + 16 bytes of data. That makes:
 * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
 * We want to fit two into the available memory so that we can immediately
 * start the next request if one finishes off. That makes 249.5 blocks
 * for one request. Give a little safety and the result is 240.
 */
static struct dasd_discipline dasd_eckd_discipline = {
      .owner = THIS_MODULE,
      .name = "ECKD",
      .ebcname = "ECKD",
      .max_blocks = 240,
      .check_device = dasd_eckd_check_characteristics,
      .uncheck_device = dasd_eckd_uncheck_device,
      .do_analysis = dasd_eckd_do_analysis,
      .ready_to_online = dasd_eckd_ready_to_online,
      .online_to_ready = dasd_eckd_online_to_ready,
      .fill_geometry = dasd_eckd_fill_geometry,
      .start_IO = dasd_start_IO,
      .term_IO = dasd_term_IO,
      .handle_terminated_request = dasd_eckd_handle_terminated_request,
      .format_device = dasd_eckd_format_device,
      .erp_action = dasd_eckd_erp_action,
      .erp_postaction = dasd_eckd_erp_postaction,
      .handle_unsolicited_interrupt = dasd_eckd_handle_unsolicited_interrupt,
      .build_cp = dasd_eckd_build_alias_cp,
      .free_cp = dasd_eckd_free_alias_cp,
      .dump_sense = dasd_eckd_dump_sense,
      .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
      .fill_info = dasd_eckd_fill_info,
      .ioctl = dasd_eckd_ioctl,
      .freeze = dasd_eckd_pm_freeze,
      .restore = dasd_eckd_restore_device,
};

static int __init
dasd_eckd_init(void)
{
      int ret;

      ASCEBC(dasd_eckd_discipline.ebcname, 4);
      ret = ccw_driver_register(&dasd_eckd_driver);
      if (!ret)
            wait_for_device_probe();

      return ret;
}

static void __exit
dasd_eckd_cleanup(void)
{
      ccw_driver_unregister(&dasd_eckd_driver);
}

module_init(dasd_eckd_init);
module_exit(dasd_eckd_cleanup);

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