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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>
 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
 *
 */

#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 "dasd_int.h"
#include "dasd_eckd.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;

struct dasd_eckd_private {
      struct dasd_eckd_characteristics rdc_data;
      struct dasd_eckd_confdata conf_data;
      struct dasd_eckd_path path_data;
      struct eckd_count count_area[5];
      int init_cqr_status;
      int uses_cdl;
      struct attrib_data_t attrib;  /* e.g. cache operations */
};

/* 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) {
            printk(KERN_WARNING
                   "dasd_eckd_probe: could not set ccw-device options "
                   "for %s\n", cdev->dev.bus_id);
            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 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,
};

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 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, int trk,
            int totrk, int cmd, struct dasd_device * device)
{
      struct dasd_eckd_private *private;
      struct ch_t geo, beg, end;
      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_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", 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 */

      geo.cyl = private->rdc_data.no_cyl;
      geo.head = private->rdc_data.trk_per_cyl;
      beg.cyl = trk / geo.head;
      beg.head = trk % geo.head;
      end.cyl = totrk / geo.head;
      end.head = totrk % geo.head;

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

            if (end.cyl + private->attrib.nr_cyl < geo.cyl)
                  end.cyl += private->attrib.nr_cyl;
            else
                  end.cyl = (geo.cyl - 1);
      }

      data->beg_ext.cyl = beg.cyl;
      data->beg_ext.head = beg.head;
      data->end_ext.cyl = end.cyl;
      data->end_ext.head = end.head;
      return rc;
}

static void
locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, int trk,
            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:
            DEV_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", cmd);
      }
      data->seek_addr.cyl = data->search_arg.cyl =
            trk / private->rdc_data.trk_per_cyl;
      data->seek_addr.head = data->search_arg.head =
            trk % private->rdc_data.trk_per_cyl;
      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;
      struct dasd_eckd_confdata *confdata;

      private = (struct dasd_eckd_private *) device->private;
      if (!private)
            return -ENODEV;
      confdata = &private->conf_data;
      if (!confdata)
            return -ENODEV;

      memset(uid, 0, sizeof(struct dasd_uid));
      memcpy(uid->vendor, confdata->ned1.HDA_manufacturer,
             sizeof(uid->vendor) - 1);
      EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
      memcpy(uid->serial, confdata->ned1.HDA_location,
             sizeof(uid->serial) - 1);
      EBCASC(uid->serial, sizeof(uid->serial) - 1);
      uid->ssid = confdata->neq.subsystemID;
      if (confdata->ned2.sneq.flags == 0x40) {
            uid->alias = 1;
            uid->unit_addr = confdata->ned2.sneq.base_unit_addr;
      } else
            uid->unit_addr = confdata->ned1.unit_addr;

      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)) {
            DEV_MESSAGE(KERN_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->device = device;
      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;
      }
      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->device);
      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_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 */
                        MESSAGE(KERN_WARNING,
                              "Read configuration data returned "
                              "error %d", rc);
                        return rc;
                  }
                  if (conf_data == NULL) {
                        MESSAGE(KERN_WARNING, "%s", "No configuration "
                              "data retrieved");
                        continue;   /* no error */
                  }
                  if (conf_len != sizeof (struct dasd_eckd_confdata)) {
                        MESSAGE(KERN_WARNING,
                              "sizes of configuration data mismatch"
                              "%d (read) vs %ld (expected)",
                              conf_len,
                              sizeof (struct dasd_eckd_confdata));
                        kfree(conf_data);
                        continue;   /* no error */
                  }
                  /* save first valid configuration data */
                  if (!conf_data_saved){
                        memcpy(&private->conf_data, conf_data,
                               sizeof (struct dasd_eckd_confdata));
                        conf_data_saved++;
                  }
                  switch (((char *)conf_data)[242] & 0x07){
                  case 0x02:
                        path_data->npm |= lpm;
                        break;
                  case 0x03:
                        path_data->ppm |= lpm;
                        break;
                  }
                  kfree(conf_data);
            }
      }
      return 0;
}

/*
 * Build CP for Perform Subsystem Function - SSC.
 */
static struct dasd_ccw_req *
dasd_eckd_build_psf_ssc(struct dasd_device *device)
{
       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)) {
             DEV_MESSAGE(KERN_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 = 0x08;

       ccw = cqr->cpaddr;
       ccw->cmd_code = DASD_ECKD_CCW_PSF;
       ccw->cda = (__u32)(addr_t)psf_ssc_data;
       ccw->count = 66;

       cqr->device = device;
       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)
{
       struct dasd_ccw_req *cqr;
       int rc;

       cqr = dasd_eckd_build_psf_ssc(device);
       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->device);
       return rc;
}

/*
 * Valide storage server of current device.
 */
static int
dasd_eckd_validate_server(struct dasd_device *device, struct dasd_uid *uid)
{
      int rc;

      /* Currently PAV is the only reason to 'validate' server on LPAR */
      if (dasd_nopav || MACHINE_IS_VM)
            return 0;

      rc = dasd_eckd_psf_ssc(device);
      /* may be requested feature is not available on server,
       * therefore just report error and go ahead */
      DEV_MESSAGE(KERN_INFO, device,
                "PSF-SSC on storage subsystem %s.%s.%04x returned rc=%d",
                uid->vendor, uid->serial, uid->ssid, rc);
      /* 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_uid uid;
      void *rdc_data;
      int rc;

      private = (struct dasd_eckd_private *) device->private;
      if (private == NULL) {
            private = kzalloc(sizeof(struct dasd_eckd_private),
                          GFP_KERNEL | GFP_DMA);
            if (private == NULL) {
                  DEV_MESSAGE(KERN_WARNING, device, "%s",
                            "memory allocation failed for private "
                            "data");
                  return -ENOMEM;
            }
            device->private = (void *) 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)
            return rc;

      /* Generate device unique id and register in devmap */
      rc = dasd_eckd_generate_uid(device, &uid);
      if (rc)
            return rc;
      rc = dasd_set_uid(device->cdev, &uid);
      if (rc == 1)      /* new server found */
            rc = dasd_eckd_validate_server(device, &uid);
      if (rc)
            return rc;

      /* Read Device Characteristics */
      rdc_data = (void *) &(private->rdc_data);
      memset(rdc_data, 0, sizeof(rdc_data));
      rc = dasd_generic_read_dev_chars(device, "ECKD", &rdc_data, 64);
      if (rc)
            DEV_MESSAGE(KERN_WARNING, device,
                      "Read device characteristics returned "
                      "rc=%d", rc);

      DEV_MESSAGE(KERN_INFO, device,
                "%04X/%02X(CU:%04X/%02X) Cyl:%d Head:%d Sec:%d",
                private->rdc_data.dev_type,
                private->rdc_data.dev_model,
                private->rdc_data.cu_type,
                private->rdc_data.cu_model.model,
                private->rdc_data.no_cyl,
                private->rdc_data.trk_per_cyl,
                private->rdc_data.sec_per_trk);
      return rc;
}

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->device = 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->device;
      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_device *device)
{
      struct dasd_eckd_private *private;
      struct dasd_ccw_req *init_cqr;

      private = (struct dasd_eckd_private *) device->private;
      init_cqr = dasd_eckd_analysis_ccw(device);
      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_device *device)
{
      struct dasd_eckd_private *private;
      struct eckd_count *count_area;
      unsigned int sb, blk_per_trk;
      int status, i;

      private = (struct dasd_eckd_private *) device->private;
      status = private->init_cqr_status;
      private->init_cqr_status = -1;
      if (status != DASD_CQR_DONE) {
            DEV_MESSAGE(KERN_WARNING, device, "%s",
                      "volume analysis returned unformatted disk");
            return -EMEDIUMTYPE;
      }

      private->uses_cdl = 1;
      /* Calculate number of blocks/records per track. */
      blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block);
      /* 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_MESSAGE(KERN_WARNING, device, "%s",
                            "Trk 0: no records after VTOC!");
      }
      if (count_area != NULL && count_area->kl == 0) {
            /* we found notthing violating our disk layout */
            if (dasd_check_blocksize(count_area->dl) == 0)
                  device->bp_block = count_area->dl;
      }
      if (device->bp_block == 0) {
            DEV_MESSAGE(KERN_WARNING, device, "%s",
                      "Volume has incompatible disk layout");
            return -EMEDIUMTYPE;
      }
      device->s2b_shift = 0;  /* bits to shift 512 to get a block */
      for (sb = 512; sb < device->bp_block; sb = sb << 1)
            device->s2b_shift++;

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

      DEV_MESSAGE(KERN_INFO, device,
                "(%dkB blks): %dkB at %dkB/trk %s",
                (device->bp_block >> 10),
                ((private->rdc_data.no_cyl *
                  private->rdc_data.trk_per_cyl *
                  blk_per_trk * (device->bp_block >> 9)) >> 1),
                ((blk_per_trk * device->bp_block) >> 10),
                private->uses_cdl ?
                "compatible disk layout" : "linux disk layout");

      return 0;
}

static int
dasd_eckd_do_analysis(struct dasd_device *device)
{
      struct dasd_eckd_private *private;

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

static int
dasd_eckd_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
{
      struct dasd_eckd_private *private;

      private = (struct dasd_eckd_private *) device->private;
      if (dasd_check_blocksize(device->bp_block) == 0) {
            geo->sectors = recs_per_track(&private->rdc_data,
                                    0, device->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, cyl, head;
      int cplength, datasize;
      int i;

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

      /* Sanity checks. */
      if (fdata->start_unit >=
          (private->rdc_data.no_cyl * private->rdc_data.trk_per_cyl)) {
            DEV_MESSAGE(KERN_INFO, device, "Track no %d too big!",
                      fdata->start_unit);
            return ERR_PTR(-EINVAL);
      }
      if (fdata->start_unit > fdata->stop_unit) {
            DEV_MESSAGE(KERN_INFO, device, "Track %d reached! ending.",
                      fdata->start_unit);
            return ERR_PTR(-EINVAL);
      }
      if (dasd_check_blocksize(fdata->blksize) != 0) {
            DEV_MESSAGE(KERN_WARNING, device,
                      "Invalid blocksize %d...terminating!",
                      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)
       * Only some bit combinations do make sense.
       */
      switch (fdata->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_MESSAGE(KERN_WARNING, device, "Invalid flags 0x%x.",
                      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 (fdata->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);
            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->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 (fdata->intensity & 0x01) {      /* write record zero */
            ect = (struct eckd_count *) data;
            data += sizeof(struct eckd_count);
            ect->cyl = cyl;
            ect->head = 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 ((fdata->intensity & ~0x08) & 0x04) {  /* erase track */
            ect = (struct eckd_count *) data;
            data += sizeof(struct eckd_count);
            ect->cyl = cyl;
            ect->head = 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 = cyl;
                  ect->head = head;
                  ect->record = i + 1;
                  ect->kl = 0;
                  ect->dl = fdata->blksize;
                  /* Check for special tracks 0-1 when formatting CDL */
                  if ((fdata->intensity & 0x08) &&
                      fdata->start_unit == 0) {
                        if (i < 3) {
                              ect->kl = 4;
                              ect->dl = sizes_trk0[i] - 4;
                        }
                  }
                  if ((fdata->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->device = device;
      fcp->retries = 2; /* set retry counter to enable ERP */
      fcp->buildclk = get_clock();
      fcp->status = DASD_CQR_FILLED;
      return fcp;
}

static dasd_era_t
dasd_eckd_examine_error(struct dasd_ccw_req * cqr, struct irb * irb)
{
      struct dasd_device *device = (struct dasd_device *) cqr->device;
      struct ccw_device *cdev = device->cdev;

      if (irb->scsw.cstat == 0x00 &&
          irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
            return dasd_era_none;

      switch (cdev->id.cu_type) {
      case 0x3990:
      case 0x2105:
      case 0x2107:
      case 0x1750:
            return dasd_3990_erp_examine(cqr, irb);
      case 0x9343:
            return dasd_9343_erp_examine(cqr, irb);
      case 0x3880:
      default:
            DEV_MESSAGE(KERN_WARNING, device, "%s",
                      "default (unknown CU type) - RECOVERABLE return");
            return dasd_era_recover;
      }
}

static dasd_erp_fn_t
dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
{
      struct dasd_device *device = (struct dasd_device *) cqr->device;
      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 struct dasd_ccw_req *
dasd_eckd_build_cp(struct dasd_device * device, struct request *req)
{
      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 blksize, blk_per_trk, off;
      int count, cidaw, cplength, datasize;
      sector_t recid, first_rec, last_rec;
      sector_t first_trk, last_trk;
      unsigned int first_offs, last_offs;
      unsigned char cmd, rcmd;

      private = (struct dasd_eckd_private *) device->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);
      /* Calculate number of blocks/records per track. */
      blksize = device->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 = req->sector >> device->s2b_shift;
      first_offs = sector_div(first_trk, blk_per_trk);
      last_rec = last_trk =
            (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
      last_offs = sector_div(last_trk, blk_per_trk);
      /* 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 >> (device->s2b_shift + 9);
#if defined(CONFIG_64BIT)
            if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
                  cidaw += bv->bv_len >> (device->s2b_shift + 9);
#endif
      }
      /* Paranoia. */
      if (count != last_rec - first_rec + 1)
            return ERR_PTR(-EINVAL);
      /* 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, device);
      if (IS_ERR(cqr))
            return cqr;
      ccw = cqr->cpaddr;
      /* First ccw is define extent. */
      if (define_extent(ccw++, cqr->data, first_trk,
                    last_trk, cmd, device) == -EAGAIN) {
            /* Clock not in sync and XRC is enabled. Try again later. */
            dasd_sfree_request(cqr, device);
            return ERR_PTR(-EAGAIN);
      }
      /* Build locate_record+read/write/ccws. */
      idaws = (unsigned long *) (cqr->data + sizeof(struct DE_eckd_data));
      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, device, 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, device, 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, device, 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 (req->cmd_flags & REQ_FAILFAST)
            set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
      cqr->device = device;
      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
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->device->private;
      blksize = cqr->device->bp_block;
      blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
      recid = req->sector >> cqr->device->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->device);
      return status;
}

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 = sizeof (struct dasd_eckd_confdata);
      memcpy(info->configuration_data, &private->conf_data,
             sizeof (struct dasd_eckd_confdata));
      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;

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

      cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
                           1, 32, device);
      if (IS_ERR(cqr)) {
            DEV_MESSAGE(KERN_WARNING, device, "%s",
                      "Could not allocate initialization request");
            return PTR_ERR(cqr);
      }
      cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RELEASE;
        cqr->cpaddr->flags |= CCW_FLAG_SLI;
        cqr->cpaddr->count = 32;
      cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
      cqr->device = 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->device);
      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;

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

      cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
                           1, 32, device);
      if (IS_ERR(cqr)) {
            DEV_MESSAGE(KERN_WARNING, device, "%s",
                      "Could not allocate initialization request");
            return PTR_ERR(cqr);
      }
      cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RESERVE;
        cqr->cpaddr->flags |= CCW_FLAG_SLI;
        cqr->cpaddr->count = 32;
      cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
      cqr->device = 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->device);
      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;

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

      cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
                           1, 32, device);
      if (IS_ERR(cqr)) {
            DEV_MESSAGE(KERN_WARNING, device, "%s",
                      "Could not allocate initialization request");
            return PTR_ERR(cqr);
      }
      cqr->cpaddr->cmd_code = DASD_ECKD_CCW_SLCK;
        cqr->cpaddr->flags |= CCW_FLAG_SLI;
        cqr->cpaddr->count = 32;
      cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
      cqr->device = 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->device);
      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)) {
            DEV_MESSAGE(KERN_WARNING, device, "%s",
                      "Could not allocate initialization request");
            return PTR_ERR(cqr);
      }
      cqr->device = 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;      /* Perfomance 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) {
            /* Prepare for Read Subsystem Data */
            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->device);
      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_MESSAGE(KERN_INFO, device,
                "cache operation mode set to %x (%i cylinder prestage)",
                private->attrib.operation, private->attrib.nr_cyl);
      return 0;
}

static int
dasd_eckd_ioctl(struct dasd_device *device, unsigned int cmd, void __user *argp)
{
      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);
      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;
}

/*
 * Print sense data and related channel program.
 * Parts are printed because printk buffer is only 1024 bytes.
 */
static void
dasd_eckd_dump_sense(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) {
            DEV_MESSAGE(KERN_ERR, 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",
                  device->cdev->dev.bus_id);
      len += sprintf(page + len, KERN_ERR PRINTK_HEADER
                   " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
                   irb->scsw.cstat, irb->scsw.dstat);
      len += sprintf(page + len, KERN_ERR PRINTK_HEADER
                   " device %s: Failing CCW: %p\n",
                   device->cdev->dev.bus_id,
                   (void *) (addr_t) irb->scsw.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);

      /* 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.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);
}

/*
 * 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,
      .do_analysis = dasd_eckd_do_analysis,
      .fill_geometry = dasd_eckd_fill_geometry,
      .start_IO = dasd_start_IO,
      .term_IO = dasd_term_IO,
      .format_device = dasd_eckd_format_device,
      .examine_error = dasd_eckd_examine_error,
      .erp_action = dasd_eckd_erp_action,
      .erp_postaction = dasd_eckd_erp_postaction,
      .build_cp = dasd_eckd_build_cp,
      .free_cp = dasd_eckd_free_cp,
      .dump_sense = dasd_eckd_dump_sense,
      .fill_info = dasd_eckd_fill_info,
      .ioctl = dasd_eckd_ioctl,
};

static int __init
dasd_eckd_init(void)
{
      ASCEBC(dasd_eckd_discipline.ebcname, 4);
      return ccw_driver_register(&dasd_eckd_driver);
}

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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