git.oblomov.eu Git - linux-2.6/blob - drivers/s390/block/dasd_eckd.c

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_eckd.c
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5  *                  Carsten Otte <Cotte@de.ibm.com>
   6  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  * Bugreports.to..: <Linux390@de.ibm.com>
   8  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
   9  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
  10  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
  11  *
  12  */
  13
  14 #define KMSG_COMPONENT "dasd"
  15
  16 #include <linux/stddef.h>
  17 #include <linux/kernel.h>
  18 #include <linux/slab.h>
  19 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  20 #include <linux/bio.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23
  24 #include <asm/debug.h>
  25 #include <asm/idals.h>
  26 #include <asm/ebcdic.h>
  27 #include <asm/io.h>
  28 #include <asm/todclk.h>
  29 #include <asm/uaccess.h>
  30 #include <asm/cio.h>
  31 #include <asm/ccwdev.h>
  32 #include <asm/itcw.h>
  33
  34 #include "dasd_int.h"
  35 #include "dasd_eckd.h"
  36 #include "../cio/chsc.h"
  37
  38
  39 #ifdef PRINTK_HEADER
  40 #undef PRINTK_HEADER
  41 #endif                          /* PRINTK_HEADER */
  42 #define PRINTK_HEADER "dasd(eckd):"
  43
  44 #define ECKD_C0(i) (i->home_bytes)
  45 #define ECKD_F(i) (i->formula)
  46 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
  47                     (i->factors.f_0x02.f1))
  48 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
  49                     (i->factors.f_0x02.f2))
  50 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
  51                     (i->factors.f_0x02.f3))
  52 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
  53 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
  54 #define ECKD_F6(i) (i->factor6)
  55 #define ECKD_F7(i) (i->factor7)
  56 #define ECKD_F8(i) (i->factor8)
  57
  58 MODULE_LICENSE("GPL");
  59
  60 static struct dasd_discipline dasd_eckd_discipline;
  61
  62 /* The ccw bus type uses this table to find devices that it sends to
  63  * dasd_eckd_probe */
  64 static struct ccw_device_id dasd_eckd_ids[] = {
  65         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
  66         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
  67         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3390, 0), .driver_info = 0x3},
  68         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
  69         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
  70         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
  71         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
  72         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
  73         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
  74         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
  75         { /* end of list */ },
  76 };
  77
  78 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  79
  80 static struct ccw_driver dasd_eckd_driver; /* see below */
  81
  82 /* initial attempt at a probe function. this can be simplified once
  83  * the other detection code is gone */
  84 static int
  85 dasd_eckd_probe (struct ccw_device *cdev)
  86 {
  87         int ret;
  88
  89         /* set ECKD specific ccw-device options */
  90         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE);
  91         if (ret) {
  92                 DBF_EVENT(DBF_WARNING,
  93                        "dasd_eckd_probe: could not set ccw-device options "
  94                        "for %s\n", dev_name(&cdev->dev));
  95                 return ret;
  96         }
  97         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
  98         return ret;
  99 }
 100
 101 static int
 102 dasd_eckd_set_online(struct ccw_device *cdev)
 103 {
 104         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
 105 }
 106
 107 static struct ccw_driver dasd_eckd_driver = {
 108         .name        = "dasd-eckd",
 109         .owner       = THIS_MODULE,
 110         .ids         = dasd_eckd_ids,
 111         .probe       = dasd_eckd_probe,
 112         .remove      = dasd_generic_remove,
 113         .set_offline = dasd_generic_set_offline,
 114         .set_online  = dasd_eckd_set_online,
 115         .notify      = dasd_generic_notify,
 116 };
 117
 118 static const int sizes_trk0[] = { 28, 148, 84 };
 119 #define LABEL_SIZE 140
 120
 121 static inline unsigned int
 122 round_up_multiple(unsigned int no, unsigned int mult)
 123 {
 124         int rem = no % mult;
 125         return (rem ? no - rem + mult : no);
 126 }
 127
 128 static inline unsigned int
 129 ceil_quot(unsigned int d1, unsigned int d2)
 130 {
 131         return (d1 + (d2 - 1)) / d2;
 132 }
 133
 134 static unsigned int
 135 recs_per_track(struct dasd_eckd_characteristics * rdc,
 136                unsigned int kl, unsigned int dl)
 137 {
 138         int dn, kn;
 139
 140         switch (rdc->dev_type) {
 141         case 0x3380:
 142                 if (kl)
 143                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 144                                        ceil_quot(dl + 12, 32));
 145                 else
 146                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 147         case 0x3390:
 148                 dn = ceil_quot(dl + 6, 232) + 1;
 149                 if (kl) {
 150                         kn = ceil_quot(kl + 6, 232) + 1;
 151                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 152                                        9 + ceil_quot(dl + 6 * dn, 34));
 153                 } else
 154                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 155         case 0x9345:
 156                 dn = ceil_quot(dl + 6, 232) + 1;
 157                 if (kl) {
 158                         kn = ceil_quot(kl + 6, 232) + 1;
 159                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 160                                        ceil_quot(dl + 6 * dn, 34));
 161                 } else
 162                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 163         }
 164         return 0;
 165 }
 166
 167 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
 168 {
 169         geo->cyl = (__u16) cyl;
 170         geo->head = cyl >> 16;
 171         geo->head <<= 4;
 172         geo->head |= head;
 173 }
 174
 175 static int
 176 check_XRC (struct ccw1         *de_ccw,
 177            struct DE_eckd_data *data,
 178            struct dasd_device  *device)
 179 {
 180         struct dasd_eckd_private *private;
 181         int rc;
 182
 183         private = (struct dasd_eckd_private *) device->private;
 184         if (!private->rdc_data.facilities.XRC_supported)
 185                 return 0;
 186
 187         /* switch on System Time Stamp - needed for XRC Support */
 188         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 189         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 190
 191         rc = get_sync_clock(&data->ep_sys_time);
 192         /* Ignore return code if sync clock is switched off. */
 193         if (rc == -ENOSYS || rc == -EACCES)
 194                 rc = 0;
 195
 196         de_ccw->count = sizeof(struct DE_eckd_data);
 197         de_ccw->flags |= CCW_FLAG_SLI;
 198         return rc;
 199 }
 200
 201 static int
 202 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
 203               unsigned int totrk, int cmd, struct dasd_device *device)
 204 {
 205         struct dasd_eckd_private *private;
 206         u32 begcyl, endcyl;
 207         u16 heads, beghead, endhead;
 208         int rc = 0;
 209
 210         private = (struct dasd_eckd_private *) device->private;
 211
 212         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 213         ccw->flags = 0;
 214         ccw->count = 16;
 215         ccw->cda = (__u32) __pa(data);
 216
 217         memset(data, 0, sizeof(struct DE_eckd_data));
 218         switch (cmd) {
 219         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 220         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 221         case DASD_ECKD_CCW_READ:
 222         case DASD_ECKD_CCW_READ_MT:
 223         case DASD_ECKD_CCW_READ_CKD:
 224         case DASD_ECKD_CCW_READ_CKD_MT:
 225         case DASD_ECKD_CCW_READ_KD:
 226         case DASD_ECKD_CCW_READ_KD_MT:
 227         case DASD_ECKD_CCW_READ_COUNT:
 228                 data->mask.perm = 0x1;
 229                 data->attributes.operation = private->attrib.operation;
 230                 break;
 231         case DASD_ECKD_CCW_WRITE:
 232         case DASD_ECKD_CCW_WRITE_MT:
 233         case DASD_ECKD_CCW_WRITE_KD:
 234         case DASD_ECKD_CCW_WRITE_KD_MT:
 235                 data->mask.perm = 0x02;
 236                 data->attributes.operation = private->attrib.operation;
 237                 rc = check_XRC (ccw, data, device);
 238                 break;
 239         case DASD_ECKD_CCW_WRITE_CKD:
 240         case DASD_ECKD_CCW_WRITE_CKD_MT:
 241                 data->attributes.operation = DASD_BYPASS_CACHE;
 242                 rc = check_XRC (ccw, data, device);
 243                 break;
 244         case DASD_ECKD_CCW_ERASE:
 245         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 246         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 247                 data->mask.perm = 0x3;
 248                 data->mask.auth = 0x1;
 249                 data->attributes.operation = DASD_BYPASS_CACHE;
 250                 rc = check_XRC (ccw, data, device);
 251                 break;
 252         default:
 253                 dev_err(&device->cdev->dev,
 254                         "0x%x is not a known command\n", cmd);
 255                 break;
 256         }
 257
 258         data->attributes.mode = 0x3;    /* ECKD */
 259
 260         if ((private->rdc_data.cu_type == 0x2105 ||
 261              private->rdc_data.cu_type == 0x2107 ||
 262              private->rdc_data.cu_type == 0x1750)
 263             && !(private->uses_cdl && trk < 2))
 264                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 265
 266         heads = private->rdc_data.trk_per_cyl;
 267         begcyl = trk / heads;
 268         beghead = trk % heads;
 269         endcyl = totrk / heads;
 270         endhead = totrk % heads;
 271
 272         /* check for sequential prestage - enhance cylinder range */
 273         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 274             data->attributes.operation == DASD_SEQ_ACCESS) {
 275
 276                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
 277                         endcyl += private->attrib.nr_cyl;
 278                 else
 279                         endcyl = (private->real_cyl - 1);
 280         }
 281
 282         set_ch_t(&data->beg_ext, begcyl, beghead);
 283         set_ch_t(&data->end_ext, endcyl, endhead);
 284         return rc;
 285 }
 286
 287 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
 288                                struct dasd_device  *device)
 289 {
 290         struct dasd_eckd_private *private;
 291         int rc;
 292
 293         private = (struct dasd_eckd_private *) device->private;
 294         if (!private->rdc_data.facilities.XRC_supported)
 295                 return 0;
 296
 297         /* switch on System Time Stamp - needed for XRC Support */
 298         pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid'   */
 299         pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
 300         pfxdata->validity.time_stamp = 1;           /* 'Time Stamp Valid'   */
 301
 302         rc = get_sync_clock(&pfxdata->define_extent.ep_sys_time);
 303         /* Ignore return code if sync clock is switched off. */
 304         if (rc == -ENOSYS || rc == -EACCES)
 305                 rc = 0;
 306         return rc;
 307 }
 308
 309 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
 310                           unsigned int rec_on_trk, int count, int cmd,
 311                           struct dasd_device *device, unsigned int reclen,
 312                           unsigned int tlf)
 313 {
 314         struct dasd_eckd_private *private;
 315         int sector;
 316         int dn, d;
 317
 318         private = (struct dasd_eckd_private *) device->private;
 319
 320         memset(data, 0, sizeof(*data));
 321         sector = 0;
 322         if (rec_on_trk) {
 323                 switch (private->rdc_data.dev_type) {
 324                 case 0x3390:
 325                         dn = ceil_quot(reclen + 6, 232);
 326                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 327                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 328                         break;
 329                 case 0x3380:
 330                         d = 7 + ceil_quot(reclen + 12, 32);
 331                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 332                         break;
 333                 }
 334         }
 335         data->sector = sector;
 336         /* note: meaning of count depends on the operation
 337          *       for record based I/O it's the number of records, but for
 338          *       track based I/O it's the number of tracks
 339          */
 340         data->count = count;
 341         switch (cmd) {
 342         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 343                 data->operation.orientation = 0x3;
 344                 data->operation.operation = 0x03;
 345                 break;
 346         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 347                 data->operation.orientation = 0x3;
 348                 data->operation.operation = 0x16;
 349                 break;
 350         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 351                 data->operation.orientation = 0x1;
 352                 data->operation.operation = 0x03;
 353                 data->count++;
 354                 break;
 355         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 356                 data->operation.orientation = 0x3;
 357                 data->operation.operation = 0x16;
 358                 data->count++;
 359                 break;
 360         case DASD_ECKD_CCW_WRITE:
 361         case DASD_ECKD_CCW_WRITE_MT:
 362         case DASD_ECKD_CCW_WRITE_KD:
 363         case DASD_ECKD_CCW_WRITE_KD_MT:
 364                 data->auxiliary.length_valid = 0x1;
 365                 data->length = reclen;
 366                 data->operation.operation = 0x01;
 367                 break;
 368         case DASD_ECKD_CCW_WRITE_CKD:
 369         case DASD_ECKD_CCW_WRITE_CKD_MT:
 370                 data->auxiliary.length_valid = 0x1;
 371                 data->length = reclen;
 372                 data->operation.operation = 0x03;
 373                 break;
 374         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 375                 data->auxiliary.length_valid = 0x1;
 376                 data->length = reclen;  /* not tlf, as one might think */
 377                 data->operation.operation = 0x3F;
 378                 data->extended_operation = 0x23;
 379                 break;
 380         case DASD_ECKD_CCW_READ:
 381         case DASD_ECKD_CCW_READ_MT:
 382         case DASD_ECKD_CCW_READ_KD:
 383         case DASD_ECKD_CCW_READ_KD_MT:
 384                 data->auxiliary.length_valid = 0x1;
 385                 data->length = reclen;
 386                 data->operation.operation = 0x06;
 387                 break;
 388         case DASD_ECKD_CCW_READ_CKD:
 389         case DASD_ECKD_CCW_READ_CKD_MT:
 390                 data->auxiliary.length_valid = 0x1;
 391                 data->length = reclen;
 392                 data->operation.operation = 0x16;
 393                 break;
 394         case DASD_ECKD_CCW_READ_COUNT:
 395                 data->operation.operation = 0x06;
 396                 break;
 397         case DASD_ECKD_CCW_READ_TRACK_DATA:
 398                 data->auxiliary.length_valid = 0x1;
 399                 data->length = tlf;
 400                 data->operation.operation = 0x0C;
 401                 break;
 402         case DASD_ECKD_CCW_ERASE:
 403                 data->length = reclen;
 404                 data->auxiliary.length_valid = 0x1;
 405                 data->operation.operation = 0x0b;
 406                 break;
 407         default:
 408                 DBF_DEV_EVENT(DBF_ERR, device,
 409                             "fill LRE unknown opcode 0x%x", cmd);
 410                 BUG();
 411         }
 412         set_ch_t(&data->seek_addr,
 413                  trk / private->rdc_data.trk_per_cyl,
 414                  trk % private->rdc_data.trk_per_cyl);
 415         data->search_arg.cyl = data->seek_addr.cyl;
 416         data->search_arg.head = data->seek_addr.head;
 417         data->search_arg.record = rec_on_trk;
 418 }
 419
 420 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 421                       unsigned int trk, unsigned int totrk, int cmd,
 422                       struct dasd_device *basedev, struct dasd_device *startdev,
 423                       unsigned char format, unsigned int rec_on_trk, int count,
 424                       unsigned int blksize, unsigned int tlf)
 425 {
 426         struct dasd_eckd_private *basepriv, *startpriv;
 427         struct DE_eckd_data *dedata;
 428         struct LRE_eckd_data *lredata;
 429         u32 begcyl, endcyl;
 430         u16 heads, beghead, endhead;
 431         int rc = 0;
 432
 433         basepriv = (struct dasd_eckd_private *) basedev->private;
 434         startpriv = (struct dasd_eckd_private *) startdev->private;
 435         dedata = &pfxdata->define_extent;
 436         lredata = &pfxdata->locate_record;
 437
 438         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 439         ccw->flags = 0;
 440         ccw->count = sizeof(*pfxdata);
 441         ccw->cda = (__u32) __pa(pfxdata);
 442
 443         memset(pfxdata, 0, sizeof(*pfxdata));
 444         /* prefix data */
 445         if (format > 1) {
 446                 DBF_DEV_EVENT(DBF_ERR, basedev,
 447                               "PFX LRE unknown format 0x%x", format);
 448                 BUG();
 449                 return -EINVAL;
 450         }
 451         pfxdata->format = format;
 452         pfxdata->base_address = basepriv->ned->unit_addr;
 453         pfxdata->base_lss = basepriv->ned->ID;
 454         pfxdata->validity.define_extent = 1;
 455
 456         /* private uid is kept up to date, conf_data may be outdated */
 457         if (startpriv->uid.type != UA_BASE_DEVICE) {
 458                 pfxdata->validity.verify_base = 1;
 459                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
 460                         pfxdata->validity.hyper_pav = 1;
 461         }
 462
 463         /* define extend data (mostly)*/
 464         switch (cmd) {
 465         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 466         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 467         case DASD_ECKD_CCW_READ:
 468         case DASD_ECKD_CCW_READ_MT:
 469         case DASD_ECKD_CCW_READ_CKD:
 470         case DASD_ECKD_CCW_READ_CKD_MT:
 471         case DASD_ECKD_CCW_READ_KD:
 472         case DASD_ECKD_CCW_READ_KD_MT:
 473         case DASD_ECKD_CCW_READ_COUNT:
 474                 dedata->mask.perm = 0x1;
 475                 dedata->attributes.operation = basepriv->attrib.operation;
 476                 break;
 477         case DASD_ECKD_CCW_READ_TRACK_DATA:
 478                 dedata->mask.perm = 0x1;
 479                 dedata->attributes.operation = basepriv->attrib.operation;
 480                 dedata->blk_size = 0;
 481                 break;
 482         case DASD_ECKD_CCW_WRITE:
 483         case DASD_ECKD_CCW_WRITE_MT:
 484         case DASD_ECKD_CCW_WRITE_KD:
 485         case DASD_ECKD_CCW_WRITE_KD_MT:
 486                 dedata->mask.perm = 0x02;
 487                 dedata->attributes.operation = basepriv->attrib.operation;
 488                 rc = check_XRC_on_prefix(pfxdata, basedev);
 489                 break;
 490         case DASD_ECKD_CCW_WRITE_CKD:
 491         case DASD_ECKD_CCW_WRITE_CKD_MT:
 492                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 493                 rc = check_XRC_on_prefix(pfxdata, basedev);
 494                 break;
 495         case DASD_ECKD_CCW_ERASE:
 496         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 497         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 498                 dedata->mask.perm = 0x3;
 499                 dedata->mask.auth = 0x1;
 500                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 501                 rc = check_XRC_on_prefix(pfxdata, basedev);
 502                 break;
 503         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 504                 dedata->mask.perm = 0x02;
 505                 dedata->attributes.operation = basepriv->attrib.operation;
 506                 dedata->blk_size = blksize;
 507                 rc = check_XRC_on_prefix(pfxdata, basedev);
 508                 break;
 509         default:
 510                 DBF_DEV_EVENT(DBF_ERR, basedev,
 511                             "PFX LRE unknown opcode 0x%x", cmd);
 512                 BUG();
 513                 return -EINVAL;
 514         }
 515
 516         dedata->attributes.mode = 0x3;  /* ECKD */
 517
 518         if ((basepriv->rdc_data.cu_type == 0x2105 ||
 519              basepriv->rdc_data.cu_type == 0x2107 ||
 520              basepriv->rdc_data.cu_type == 0x1750)
 521             && !(basepriv->uses_cdl && trk < 2))
 522                 dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
 523
 524         heads = basepriv->rdc_data.trk_per_cyl;
 525         begcyl = trk / heads;
 526         beghead = trk % heads;
 527         endcyl = totrk / heads;
 528         endhead = totrk % heads;
 529
 530         /* check for sequential prestage - enhance cylinder range */
 531         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
 532             dedata->attributes.operation == DASD_SEQ_ACCESS) {
 533
 534                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
 535                         endcyl += basepriv->attrib.nr_cyl;
 536                 else
 537                         endcyl = (basepriv->real_cyl - 1);
 538         }
 539
 540         set_ch_t(&dedata->beg_ext, begcyl, beghead);
 541         set_ch_t(&dedata->end_ext, endcyl, endhead);
 542
 543         if (format == 1) {
 544                 fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
 545                               basedev, blksize, tlf);
 546         }
 547
 548         return rc;
 549 }
 550
 551 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 552                   unsigned int trk, unsigned int totrk, int cmd,
 553                   struct dasd_device *basedev, struct dasd_device *startdev)
 554 {
 555         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
 556                           0, 0, 0, 0, 0);
 557 }
 558
 559 static void
 560 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
 561               unsigned int rec_on_trk, int no_rec, int cmd,
 562               struct dasd_device * device, int reclen)
 563 {
 564         struct dasd_eckd_private *private;
 565         int sector;
 566         int dn, d;
 567
 568         private = (struct dasd_eckd_private *) device->private;
 569
 570         DBF_DEV_EVENT(DBF_INFO, device,
 571                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 572                   trk, rec_on_trk, no_rec, cmd, reclen);
 573
 574         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 575         ccw->flags = 0;
 576         ccw->count = 16;
 577         ccw->cda = (__u32) __pa(data);
 578
 579         memset(data, 0, sizeof(struct LO_eckd_data));
 580         sector = 0;
 581         if (rec_on_trk) {
 582                 switch (private->rdc_data.dev_type) {
 583                 case 0x3390:
 584                         dn = ceil_quot(reclen + 6, 232);
 585                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 586                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 587                         break;
 588                 case 0x3380:
 589                         d = 7 + ceil_quot(reclen + 12, 32);
 590                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 591                         break;
 592                 }
 593         }
 594         data->sector = sector;
 595         data->count = no_rec;
 596         switch (cmd) {
 597         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 598                 data->operation.orientation = 0x3;
 599                 data->operation.operation = 0x03;
 600                 break;
 601         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 602                 data->operation.orientation = 0x3;
 603                 data->operation.operation = 0x16;
 604                 break;
 605         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 606                 data->operation.orientation = 0x1;
 607                 data->operation.operation = 0x03;
 608                 data->count++;
 609                 break;
 610         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 611                 data->operation.orientation = 0x3;
 612                 data->operation.operation = 0x16;
 613                 data->count++;
 614                 break;
 615         case DASD_ECKD_CCW_WRITE:
 616         case DASD_ECKD_CCW_WRITE_MT:
 617         case DASD_ECKD_CCW_WRITE_KD:
 618         case DASD_ECKD_CCW_WRITE_KD_MT:
 619                 data->auxiliary.last_bytes_used = 0x1;
 620                 data->length = reclen;
 621                 data->operation.operation = 0x01;
 622                 break;
 623         case DASD_ECKD_CCW_WRITE_CKD:
 624         case DASD_ECKD_CCW_WRITE_CKD_MT:
 625                 data->auxiliary.last_bytes_used = 0x1;
 626                 data->length = reclen;
 627                 data->operation.operation = 0x03;
 628                 break;
 629         case DASD_ECKD_CCW_READ:
 630         case DASD_ECKD_CCW_READ_MT:
 631         case DASD_ECKD_CCW_READ_KD:
 632         case DASD_ECKD_CCW_READ_KD_MT:
 633                 data->auxiliary.last_bytes_used = 0x1;
 634                 data->length = reclen;
 635                 data->operation.operation = 0x06;
 636                 break;
 637         case DASD_ECKD_CCW_READ_CKD:
 638         case DASD_ECKD_CCW_READ_CKD_MT:
 639                 data->auxiliary.last_bytes_used = 0x1;
 640                 data->length = reclen;
 641                 data->operation.operation = 0x16;
 642                 break;
 643         case DASD_ECKD_CCW_READ_COUNT:
 644                 data->operation.operation = 0x06;
 645                 break;
 646         case DASD_ECKD_CCW_ERASE:
 647                 data->length = reclen;
 648                 data->auxiliary.last_bytes_used = 0x1;
 649                 data->operation.operation = 0x0b;
 650                 break;
 651         default:
 652                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
 653                               "opcode 0x%x", cmd);
 654         }
 655         set_ch_t(&data->seek_addr,
 656                  trk / private->rdc_data.trk_per_cyl,
 657                  trk % private->rdc_data.trk_per_cyl);
 658         data->search_arg.cyl = data->seek_addr.cyl;
 659         data->search_arg.head = data->seek_addr.head;
 660         data->search_arg.record = rec_on_trk;
 661 }
 662
 663 /*
 664  * Returns 1 if the block is one of the special blocks that needs
 665  * to get read/written with the KD variant of the command.
 666  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 667  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 668  * Luckily the KD variants differ only by one bit (0x08) from the
 669  * normal variant. So don't wonder about code like:
 670  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 671  *         ccw->cmd_code |= 0x8;
 672  */
 673 static inline int
 674 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 675 {
 676         if (recid < 3)
 677                 return 1;
 678         if (recid < blk_per_trk)
 679                 return 0;
 680         if (recid < 2 * blk_per_trk)
 681                 return 1;
 682         return 0;
 683 }
 684
 685 /*
 686  * Returns the record size for the special blocks of the cdl format.
 687  * Only returns something useful if dasd_eckd_cdl_special is true
 688  * for the recid.
 689  */
 690 static inline int
 691 dasd_eckd_cdl_reclen(int recid)
 692 {
 693         if (recid < 3)
 694                 return sizes_trk0[recid];
 695         return LABEL_SIZE;
 696 }
 697
 698 /*
 699  * Generate device unique id that specifies the physical device.
 700  */
 701 static int dasd_eckd_generate_uid(struct dasd_device *device,
 702                                   struct dasd_uid *uid)
 703 {
 704         struct dasd_eckd_private *private;
 705         int count;
 706
 707         private = (struct dasd_eckd_private *) device->private;
 708         if (!private)
 709                 return -ENODEV;
 710         if (!private->ned || !private->gneq)
 711                 return -ENODEV;
 712
 713         memset(uid, 0, sizeof(struct dasd_uid));
 714         memcpy(uid->vendor, private->ned->HDA_manufacturer,
 715                sizeof(uid->vendor) - 1);
 716         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 717         memcpy(uid->serial, private->ned->HDA_location,
 718                sizeof(uid->serial) - 1);
 719         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 720         uid->ssid = private->gneq->subsystemID;
 721         uid->real_unit_addr = private->ned->unit_addr;;
 722         if (private->sneq) {
 723                 uid->type = private->sneq->sua_flags;
 724                 if (uid->type == UA_BASE_PAV_ALIAS)
 725                         uid->base_unit_addr = private->sneq->base_unit_addr;
 726         } else {
 727                 uid->type = UA_BASE_DEVICE;
 728         }
 729         if (private->vdsneq) {
 730                 for (count = 0; count < 16; count++) {
 731                         sprintf(uid->vduit+2*count, "%02x",
 732                                 private->vdsneq->uit[count]);
 733                 }
 734         }
 735         return 0;
 736 }
 737
 738 static struct dasd_ccw_req *dasd_eckd_build_rcd_lpm(struct dasd_device *device,
 739                                                     void *rcd_buffer,
 740                                                     struct ciw *ciw, __u8 lpm)
 741 {
 742         struct dasd_ccw_req *cqr;
 743         struct ccw1 *ccw;
 744
 745         cqr = dasd_smalloc_request("ECKD", 1 /* RCD */, ciw->count, device);
 746
 747         if (IS_ERR(cqr)) {
 748                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 749                               "Could not allocate RCD request");
 750                 return cqr;
 751         }
 752
 753         ccw = cqr->cpaddr;
 754         ccw->cmd_code = ciw->cmd;
 755         ccw->cda = (__u32)(addr_t)rcd_buffer;
 756         ccw->count = ciw->count;
 757
 758         cqr->startdev = device;
 759         cqr->memdev = device;
 760         cqr->block = NULL;
 761         cqr->expires = 10*HZ;
 762         cqr->lpm = lpm;
 763         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 764         cqr->retries = 2;
 765         cqr->buildclk = get_clock();
 766         cqr->status = DASD_CQR_FILLED;
 767         return cqr;
 768 }
 769
 770 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 771                                    void **rcd_buffer,
 772                                    int *rcd_buffer_size, __u8 lpm)
 773 {
 774         struct ciw *ciw;
 775         char *rcd_buf = NULL;
 776         int ret;
 777         struct dasd_ccw_req *cqr;
 778
 779         /*
 780          * scan for RCD command in extended SenseID data
 781          */
 782         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 783         if (!ciw || ciw->cmd == 0) {
 784                 ret = -EOPNOTSUPP;
 785                 goto out_error;
 786         }
 787         rcd_buf = kzalloc(ciw->count, GFP_KERNEL | GFP_DMA);
 788         if (!rcd_buf) {
 789                 ret = -ENOMEM;
 790                 goto out_error;
 791         }
 792
 793         /*
 794          * buffer has to start with EBCDIC "V1.0" to show
 795          * support for virtual device SNEQ
 796          */
 797         rcd_buf[0] = 0xE5;
 798         rcd_buf[1] = 0xF1;
 799         rcd_buf[2] = 0x4B;
 800         rcd_buf[3] = 0xF0;
 801         cqr = dasd_eckd_build_rcd_lpm(device, rcd_buf, ciw, lpm);
 802         if (IS_ERR(cqr)) {
 803                 ret =  PTR_ERR(cqr);
 804                 goto out_error;
 805         }
 806         ret = dasd_sleep_on(cqr);
 807         /*
 808          * on success we update the user input parms
 809          */
 810         dasd_sfree_request(cqr, cqr->memdev);
 811         if (ret)
 812                 goto out_error;
 813
 814         *rcd_buffer_size = ciw->count;
 815         *rcd_buffer = rcd_buf;
 816         return 0;
 817 out_error:
 818         kfree(rcd_buf);
 819         *rcd_buffer = NULL;
 820         *rcd_buffer_size = 0;
 821         return ret;
 822 }
 823
 824 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
 825 {
 826
 827         struct dasd_sneq *sneq;
 828         int i, count;
 829
 830         private->ned = NULL;
 831         private->sneq = NULL;
 832         private->vdsneq = NULL;
 833         private->gneq = NULL;
 834         count = private->conf_len / sizeof(struct dasd_sneq);
 835         sneq = (struct dasd_sneq *)private->conf_data;
 836         for (i = 0; i < count; ++i) {
 837                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 838                         private->sneq = sneq;
 839                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 840                         private->vdsneq = (struct vd_sneq *)sneq;
 841                 else if (sneq->flags.identifier == 2)
 842                         private->gneq = (struct dasd_gneq *)sneq;
 843                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 844                         private->ned = (struct dasd_ned *)sneq;
 845                 sneq++;
 846         }
 847         if (!private->ned || !private->gneq) {
 848                 private->ned = NULL;
 849                 private->sneq = NULL;
 850                 private->vdsneq = NULL;
 851                 private->gneq = NULL;
 852                 return -EINVAL;
 853         }
 854         return 0;
 855
 856 };
 857
 858 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
 859 {
 860         struct dasd_gneq *gneq;
 861         int i, count, found;
 862
 863         count = conf_len / sizeof(*gneq);
 864         gneq = (struct dasd_gneq *)conf_data;
 865         found = 0;
 866         for (i = 0; i < count; ++i) {
 867                 if (gneq->flags.identifier == 2) {
 868                         found = 1;
 869                         break;
 870                 }
 871                 gneq++;
 872         }
 873         if (found)
 874                 return ((char *)gneq)[18] & 0x07;
 875         else
 876                 return 0;
 877 }
 878
 879 static int dasd_eckd_read_conf(struct dasd_device *device)
 880 {
 881         void *conf_data;
 882         int conf_len, conf_data_saved;
 883         int rc;
 884         __u8 lpm;
 885         struct dasd_eckd_private *private;
 886         struct dasd_eckd_path *path_data;
 887
 888         private = (struct dasd_eckd_private *) device->private;
 889         path_data = (struct dasd_eckd_path *) &private->path_data;
 890         path_data->opm = ccw_device_get_path_mask(device->cdev);
 891         lpm = 0x80;
 892         conf_data_saved = 0;
 893         /* get configuration data per operational path */
 894         for (lpm = 0x80; lpm; lpm>>= 1) {
 895                 if (lpm & path_data->opm){
 896                         rc = dasd_eckd_read_conf_lpm(device, &conf_data,
 897                                                      &conf_len, lpm);
 898                         if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
 899                                 DBF_EVENT(DBF_WARNING,
 900                                           "Read configuration data returned "
 901                                           "error %d for device: %s", rc,
 902                                           dev_name(&device->cdev->dev));
 903                                 return rc;
 904                         }
 905                         if (conf_data == NULL) {
 906                                 DBF_EVENT(DBF_WARNING, "No configuration "
 907                                           "data retrieved for device: %s",
 908                                           dev_name(&device->cdev->dev));
 909                                 continue;       /* no error */
 910                         }
 911                         /* save first valid configuration data */
 912                         if (!conf_data_saved) {
 913                                 kfree(private->conf_data);
 914                                 private->conf_data = conf_data;
 915                                 private->conf_len = conf_len;
 916                                 if (dasd_eckd_identify_conf_parts(private)) {
 917                                         private->conf_data = NULL;
 918                                         private->conf_len = 0;
 919                                         kfree(conf_data);
 920                                         continue;
 921                                 }
 922                                 conf_data_saved++;
 923                         }
 924                         switch (dasd_eckd_path_access(conf_data, conf_len)) {
 925                         case 0x02:
 926                                 path_data->npm |= lpm;
 927                                 break;
 928                         case 0x03:
 929                                 path_data->ppm |= lpm;
 930                                 break;
 931                         }
 932                         if (conf_data != private->conf_data)
 933                                 kfree(conf_data);
 934                 }
 935         }
 936         return 0;
 937 }
 938
 939 static int dasd_eckd_read_features(struct dasd_device *device)
 940 {
 941         struct dasd_psf_prssd_data *prssdp;
 942         struct dasd_rssd_features *features;
 943         struct dasd_ccw_req *cqr;
 944         struct ccw1 *ccw;
 945         int rc;
 946         struct dasd_eckd_private *private;
 947
 948         private = (struct dasd_eckd_private *) device->private;
 949         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
 950                                    1 /* PSF */  + 1 /* RSSD */ ,
 951                                    (sizeof(struct dasd_psf_prssd_data) +
 952                                     sizeof(struct dasd_rssd_features)),
 953                                    device);
 954         if (IS_ERR(cqr)) {
 955                 DBF_EVENT(DBF_WARNING, "Could not allocate initialization "
 956                           "request for device: %s",
 957                           dev_name(&device->cdev->dev));
 958                 return PTR_ERR(cqr);
 959         }
 960         cqr->startdev = device;
 961         cqr->memdev = device;
 962         cqr->block = NULL;
 963         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 964         cqr->retries = 5;
 965         cqr->expires = 10 * HZ;
 966
 967         /* Prepare for Read Subsystem Data */
 968         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
 969         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
 970         prssdp->order = PSF_ORDER_PRSSD;
 971         prssdp->suborder = 0x41;        /* Read Feature Codes */
 972         /* all other bytes of prssdp must be zero */
 973
 974         ccw = cqr->cpaddr;
 975         ccw->cmd_code = DASD_ECKD_CCW_PSF;
 976         ccw->count = sizeof(struct dasd_psf_prssd_data);
 977         ccw->flags |= CCW_FLAG_CC;
 978         ccw->cda = (__u32)(addr_t) prssdp;
 979
 980         /* Read Subsystem Data - feature codes */
 981         features = (struct dasd_rssd_features *) (prssdp + 1);
 982         memset(features, 0, sizeof(struct dasd_rssd_features));
 983
 984         ccw++;
 985         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
 986         ccw->count = sizeof(struct dasd_rssd_features);
 987         ccw->cda = (__u32)(addr_t) features;
 988
 989         cqr->buildclk = get_clock();
 990         cqr->status = DASD_CQR_FILLED;
 991         rc = dasd_sleep_on(cqr);
 992         if (rc == 0) {
 993                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
 994                 features = (struct dasd_rssd_features *) (prssdp + 1);
 995                 memcpy(&private->features, features,
 996                        sizeof(struct dasd_rssd_features));
 997         }
 998         dasd_sfree_request(cqr, cqr->memdev);
 999         return rc;
1000 }
1001
1002
1003 /*
1004  * Build CP for Perform Subsystem Function - SSC.
1005  */
1006 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1007                                                     int enable_pav)
1008 {
1009         struct dasd_ccw_req *cqr;
1010         struct dasd_psf_ssc_data *psf_ssc_data;
1011         struct ccw1 *ccw;
1012
1013         cqr = dasd_smalloc_request("ECKD", 1 /* PSF */ ,
1014                                   sizeof(struct dasd_psf_ssc_data),
1015                                   device);
1016
1017         if (IS_ERR(cqr)) {
1018                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1019                            "Could not allocate PSF-SSC request");
1020                 return cqr;
1021         }
1022         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1023         psf_ssc_data->order = PSF_ORDER_SSC;
1024         psf_ssc_data->suborder = 0x40;
1025         if (enable_pav) {
1026                 psf_ssc_data->suborder |= 0x88;
1027                 psf_ssc_data->reserved[0] = 0x88;
1028         }
1029         ccw = cqr->cpaddr;
1030         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1031         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1032         ccw->count = 66;
1033
1034         cqr->startdev = device;
1035         cqr->memdev = device;
1036         cqr->block = NULL;
1037         cqr->expires = 10*HZ;
1038         cqr->buildclk = get_clock();
1039         cqr->status = DASD_CQR_FILLED;
1040         return cqr;
1041 }
1042
1043 /*
1044  * Perform Subsystem Function.
1045  * It is necessary to trigger CIO for channel revalidation since this
1046  * call might change behaviour of DASD devices.
1047  */
1048 static int
1049 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav)
1050 {
1051         struct dasd_ccw_req *cqr;
1052         int rc;
1053
1054         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1055         if (IS_ERR(cqr))
1056                 return PTR_ERR(cqr);
1057
1058         rc = dasd_sleep_on(cqr);
1059         if (!rc)
1060                 /* trigger CIO to reprobe devices */
1061                 css_schedule_reprobe();
1062         dasd_sfree_request(cqr, cqr->memdev);
1063         return rc;
1064 }
1065
1066 /*
1067  * Valide storage server of current device.
1068  */
1069 static int dasd_eckd_validate_server(struct dasd_device *device)
1070 {
1071         int rc;
1072         struct dasd_eckd_private *private;
1073         int enable_pav;
1074
1075         if (dasd_nopav || MACHINE_IS_VM)
1076                 enable_pav = 0;
1077         else
1078                 enable_pav = 1;
1079         rc = dasd_eckd_psf_ssc(device, enable_pav);
1080         /* may be requested feature is not available on server,
1081          * therefore just report error and go ahead */
1082         private = (struct dasd_eckd_private *) device->private;
1083         DBF_EVENT(DBF_WARNING, "PSF-SSC on storage subsystem %s.%s.%04x "
1084                   "returned rc=%d for device: %s",
1085                   private->uid.vendor, private->uid.serial,
1086                   private->uid.ssid, rc, dev_name(&device->cdev->dev));
1087         /* RE-Read Configuration Data */
1088         return dasd_eckd_read_conf(device);
1089 }
1090
1091 /*
1092  * Check device characteristics.
1093  * If the device is accessible using ECKD discipline, the device is enabled.
1094  */
1095 static int
1096 dasd_eckd_check_characteristics(struct dasd_device *device)
1097 {
1098         struct dasd_eckd_private *private;
1099         struct dasd_block *block;
1100         int is_known, rc;
1101
1102         private = (struct dasd_eckd_private *) device->private;
1103         if (!private) {
1104                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1105                 if (!private) {
1106                         dev_warn(&device->cdev->dev,
1107                                  "Allocating memory for private DASD data "
1108                                  "failed\n");
1109                         return -ENOMEM;
1110                 }
1111                 device->private = (void *) private;
1112         } else {
1113                 memset(private, 0, sizeof(*private));
1114         }
1115         /* Invalidate status of initial analysis. */
1116         private->init_cqr_status = -1;
1117         /* Set default cache operations. */
1118         private->attrib.operation = DASD_NORMAL_CACHE;
1119         private->attrib.nr_cyl = 0;
1120
1121         /* Read Configuration Data */
1122         rc = dasd_eckd_read_conf(device);
1123         if (rc)
1124                 goto out_err1;
1125
1126         /* Generate device unique id and register in devmap */
1127         rc = dasd_eckd_generate_uid(device, &private->uid);
1128         if (rc)
1129                 goto out_err1;
1130         dasd_set_uid(device->cdev, &private->uid);
1131
1132         if (private->uid.type == UA_BASE_DEVICE) {
1133                 block = dasd_alloc_block();
1134                 if (IS_ERR(block)) {
1135                         DBF_EVENT(DBF_WARNING, "could not allocate dasd "
1136                                   "block structure for device: %s",
1137                                   dev_name(&device->cdev->dev));
1138                         rc = PTR_ERR(block);
1139                         goto out_err1;
1140                 }
1141                 device->block = block;
1142                 block->base = device;
1143         }
1144
1145         /* register lcu with alias handling, enable PAV if this is a new lcu */
1146         is_known = dasd_alias_make_device_known_to_lcu(device);
1147         if (is_known < 0) {
1148                 rc = is_known;
1149                 goto out_err2;
1150         }
1151         if (!is_known) {
1152                 /* new lcu found */
1153                 rc = dasd_eckd_validate_server(device); /* will switch pav on */
1154                 if (rc)
1155                         goto out_err3;
1156         }
1157
1158         /* Read Feature Codes */
1159         rc = dasd_eckd_read_features(device);
1160         if (rc)
1161                 goto out_err3;
1162
1163         /* Read Device Characteristics */
1164         rc = dasd_generic_read_dev_chars(device, "ECKD", &private->rdc_data,
1165                                          64);
1166         if (rc) {
1167                 DBF_EVENT(DBF_WARNING,
1168                           "Read device characteristics failed, rc=%d for "
1169                           "device: %s", rc, dev_name(&device->cdev->dev));
1170                 goto out_err3;
1171         }
1172         /* find the vaild cylinder size */
1173         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1174             private->rdc_data.long_no_cyl)
1175                 private->real_cyl = private->rdc_data.long_no_cyl;
1176         else
1177                 private->real_cyl = private->rdc_data.no_cyl;
1178
1179         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1180                  "with %d cylinders, %d heads, %d sectors\n",
1181                  private->rdc_data.dev_type,
1182                  private->rdc_data.dev_model,
1183                  private->rdc_data.cu_type,
1184                  private->rdc_data.cu_model.model,
1185                  private->real_cyl,
1186                  private->rdc_data.trk_per_cyl,
1187                  private->rdc_data.sec_per_trk);
1188         return 0;
1189
1190 out_err3:
1191         dasd_alias_disconnect_device_from_lcu(device);
1192 out_err2:
1193         dasd_free_block(device->block);
1194         device->block = NULL;
1195 out_err1:
1196         kfree(private->conf_data);
1197         kfree(device->private);
1198         device->private = NULL;
1199         return rc;
1200 }
1201
1202 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1203 {
1204         struct dasd_eckd_private *private;
1205
1206         private = (struct dasd_eckd_private *) device->private;
1207         dasd_alias_disconnect_device_from_lcu(device);
1208         private->ned = NULL;
1209         private->sneq = NULL;
1210         private->vdsneq = NULL;
1211         private->gneq = NULL;
1212         private->conf_len = 0;
1213         kfree(private->conf_data);
1214         private->conf_data = NULL;
1215 }
1216
1217 static struct dasd_ccw_req *
1218 dasd_eckd_analysis_ccw(struct dasd_device *device)
1219 {
1220         struct dasd_eckd_private *private;
1221         struct eckd_count *count_data;
1222         struct LO_eckd_data *LO_data;
1223         struct dasd_ccw_req *cqr;
1224         struct ccw1 *ccw;
1225         int cplength, datasize;
1226         int i;
1227
1228         private = (struct dasd_eckd_private *) device->private;
1229
1230         cplength = 8;
1231         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1232         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1233                                    cplength, datasize, device);
1234         if (IS_ERR(cqr))
1235                 return cqr;
1236         ccw = cqr->cpaddr;
1237         /* Define extent for the first 3 tracks. */
1238         define_extent(ccw++, cqr->data, 0, 2,
1239                       DASD_ECKD_CCW_READ_COUNT, device);
1240         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1241         /* Locate record for the first 4 records on track 0. */
1242         ccw[-1].flags |= CCW_FLAG_CC;
1243         locate_record(ccw++, LO_data++, 0, 0, 4,
1244                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1245
1246         count_data = private->count_area;
1247         for (i = 0; i < 4; i++) {
1248                 ccw[-1].flags |= CCW_FLAG_CC;
1249                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1250                 ccw->flags = 0;
1251                 ccw->count = 8;
1252                 ccw->cda = (__u32)(addr_t) count_data;
1253                 ccw++;
1254                 count_data++;
1255         }
1256
1257         /* Locate record for the first record on track 2. */
1258         ccw[-1].flags |= CCW_FLAG_CC;
1259         locate_record(ccw++, LO_data++, 2, 0, 1,
1260                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1261         /* Read count ccw. */
1262         ccw[-1].flags |= CCW_FLAG_CC;
1263         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1264         ccw->flags = 0;
1265         ccw->count = 8;
1266         ccw->cda = (__u32)(addr_t) count_data;
1267
1268         cqr->block = NULL;
1269         cqr->startdev = device;
1270         cqr->memdev = device;
1271         cqr->retries = 0;
1272         cqr->buildclk = get_clock();
1273         cqr->status = DASD_CQR_FILLED;
1274         return cqr;
1275 }
1276
1277 /*
1278  * This is the callback function for the init_analysis cqr. It saves
1279  * the status of the initial analysis ccw before it frees it and kicks
1280  * the device to continue the startup sequence. This will call
1281  * dasd_eckd_do_analysis again (if the devices has not been marked
1282  * for deletion in the meantime).
1283  */
1284 static void
1285 dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, void *data)
1286 {
1287         struct dasd_eckd_private *private;
1288         struct dasd_device *device;
1289
1290         device = init_cqr->startdev;
1291         private = (struct dasd_eckd_private *) device->private;
1292         private->init_cqr_status = init_cqr->status;
1293         dasd_sfree_request(init_cqr, device);
1294         dasd_kick_device(device);
1295 }
1296
1297 static int
1298 dasd_eckd_start_analysis(struct dasd_block *block)
1299 {
1300         struct dasd_eckd_private *private;
1301         struct dasd_ccw_req *init_cqr;
1302
1303         private = (struct dasd_eckd_private *) block->base->private;
1304         init_cqr = dasd_eckd_analysis_ccw(block->base);
1305         if (IS_ERR(init_cqr))
1306                 return PTR_ERR(init_cqr);
1307         init_cqr->callback = dasd_eckd_analysis_callback;
1308         init_cqr->callback_data = NULL;
1309         init_cqr->expires = 5*HZ;
1310         dasd_add_request_head(init_cqr);
1311         return -EAGAIN;
1312 }
1313
1314 static int
1315 dasd_eckd_end_analysis(struct dasd_block *block)
1316 {
1317         struct dasd_device *device;
1318         struct dasd_eckd_private *private;
1319         struct eckd_count *count_area;
1320         unsigned int sb, blk_per_trk;
1321         int status, i;
1322
1323         device = block->base;
1324         private = (struct dasd_eckd_private *) device->private;
1325         status = private->init_cqr_status;
1326         private->init_cqr_status = -1;
1327         if (status != DASD_CQR_DONE) {
1328                 dev_warn(&device->cdev->dev,
1329                             "The DASD is not formatted\n");
1330                 return -EMEDIUMTYPE;
1331         }
1332
1333         private->uses_cdl = 1;
1334         /* Check Track 0 for Compatible Disk Layout */
1335         count_area = NULL;
1336         for (i = 0; i < 3; i++) {
1337                 if (private->count_area[i].kl != 4 ||
1338                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
1339                         private->uses_cdl = 0;
1340                         break;
1341                 }
1342         }
1343         if (i == 3)
1344                 count_area = &private->count_area[4];
1345
1346         if (private->uses_cdl == 0) {
1347                 for (i = 0; i < 5; i++) {
1348                         if ((private->count_area[i].kl != 0) ||
1349                             (private->count_area[i].dl !=
1350                              private->count_area[0].dl))
1351                                 break;
1352                 }
1353                 if (i == 5)
1354                         count_area = &private->count_area[0];
1355         } else {
1356                 if (private->count_area[3].record == 1)
1357                         dev_warn(&device->cdev->dev,
1358                                  "Track 0 has no records following the VTOC\n");
1359         }
1360         if (count_area != NULL && count_area->kl == 0) {
1361                 /* we found notthing violating our disk layout */
1362                 if (dasd_check_blocksize(count_area->dl) == 0)
1363                         block->bp_block = count_area->dl;
1364         }
1365         if (block->bp_block == 0) {
1366                 dev_warn(&device->cdev->dev,
1367                          "The disk layout of the DASD is not supported\n");
1368                 return -EMEDIUMTYPE;
1369         }
1370         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1371         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1372                 block->s2b_shift++;
1373
1374         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1375         block->blocks = (private->real_cyl *
1376                           private->rdc_data.trk_per_cyl *
1377                           blk_per_trk);
1378
1379         dev_info(&device->cdev->dev,
1380                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
1381                  "%s\n", (block->bp_block >> 10),
1382                  ((private->real_cyl *
1383                    private->rdc_data.trk_per_cyl *
1384                    blk_per_trk * (block->bp_block >> 9)) >> 1),
1385                  ((blk_per_trk * block->bp_block) >> 10),
1386                  private->uses_cdl ?
1387                  "compatible disk layout" : "linux disk layout");
1388
1389         return 0;
1390 }
1391
1392 static int dasd_eckd_do_analysis(struct dasd_block *block)
1393 {
1394         struct dasd_eckd_private *private;
1395
1396         private = (struct dasd_eckd_private *) block->base->private;
1397         if (private->init_cqr_status < 0)
1398                 return dasd_eckd_start_analysis(block);
1399         else
1400                 return dasd_eckd_end_analysis(block);
1401 }
1402
1403 static int dasd_eckd_ready_to_online(struct dasd_device *device)
1404 {
1405         return dasd_alias_add_device(device);
1406 };
1407
1408 static int dasd_eckd_online_to_ready(struct dasd_device *device)
1409 {
1410         return dasd_alias_remove_device(device);
1411 };
1412
1413 static int
1414 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
1415 {
1416         struct dasd_eckd_private *private;
1417
1418         private = (struct dasd_eckd_private *) block->base->private;
1419         if (dasd_check_blocksize(block->bp_block) == 0) {
1420                 geo->sectors = recs_per_track(&private->rdc_data,
1421                                               0, block->bp_block);
1422         }
1423         geo->cylinders = private->rdc_data.no_cyl;
1424         geo->heads = private->rdc_data.trk_per_cyl;
1425         return 0;
1426 }
1427
1428 static struct dasd_ccw_req *
1429 dasd_eckd_format_device(struct dasd_device * device,
1430                         struct format_data_t * fdata)
1431 {
1432         struct dasd_eckd_private *private;
1433         struct dasd_ccw_req *fcp;
1434         struct eckd_count *ect;
1435         struct ccw1 *ccw;
1436         void *data;
1437         int rpt;
1438         struct ch_t address;
1439         int cplength, datasize;
1440         int i;
1441         int intensity = 0;
1442         int r0_perm;
1443
1444         private = (struct dasd_eckd_private *) device->private;
1445         rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
1446         set_ch_t(&address,
1447                  fdata->start_unit / private->rdc_data.trk_per_cyl,
1448                  fdata->start_unit % private->rdc_data.trk_per_cyl);
1449
1450         /* Sanity checks. */
1451         if (fdata->start_unit >=
1452             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
1453                 dev_warn(&device->cdev->dev, "Start track number %d used in "
1454                          "formatting is too big\n", fdata->start_unit);
1455                 return ERR_PTR(-EINVAL);
1456         }
1457         if (fdata->start_unit > fdata->stop_unit) {
1458                 dev_warn(&device->cdev->dev, "Start track %d used in "
1459                          "formatting exceeds end track\n", fdata->start_unit);
1460                 return ERR_PTR(-EINVAL);
1461         }
1462         if (dasd_check_blocksize(fdata->blksize) != 0) {
1463                 dev_warn(&device->cdev->dev,
1464                          "The DASD cannot be formatted with block size %d\n",
1465                          fdata->blksize);
1466                 return ERR_PTR(-EINVAL);
1467         }
1468
1469         /*
1470          * fdata->intensity is a bit string that tells us what to do:
1471          *   Bit 0: write record zero
1472          *   Bit 1: write home address, currently not supported
1473          *   Bit 2: invalidate tracks
1474          *   Bit 3: use OS/390 compatible disk layout (cdl)
1475          *   Bit 4: do not allow storage subsystem to modify record zero
1476          * Only some bit combinations do make sense.
1477          */
1478         if (fdata->intensity & 0x10) {
1479                 r0_perm = 0;
1480                 intensity = fdata->intensity & ~0x10;
1481         } else {
1482                 r0_perm = 1;
1483                 intensity = fdata->intensity;
1484         }
1485         switch (intensity) {
1486         case 0x00:      /* Normal format */
1487         case 0x08:      /* Normal format, use cdl. */
1488                 cplength = 2 + rpt;
1489                 datasize = sizeof(struct DE_eckd_data) +
1490                         sizeof(struct LO_eckd_data) +
1491                         rpt * sizeof(struct eckd_count);
1492                 break;
1493         case 0x01:      /* Write record zero and format track. */
1494         case 0x09:      /* Write record zero and format track, use cdl. */
1495                 cplength = 3 + rpt;
1496                 datasize = sizeof(struct DE_eckd_data) +
1497                         sizeof(struct LO_eckd_data) +
1498                         sizeof(struct eckd_count) +
1499                         rpt * sizeof(struct eckd_count);
1500                 break;
1501         case 0x04:      /* Invalidate track. */
1502         case 0x0c:      /* Invalidate track, use cdl. */
1503                 cplength = 3;
1504                 datasize = sizeof(struct DE_eckd_data) +
1505                         sizeof(struct LO_eckd_data) +
1506                         sizeof(struct eckd_count);
1507                 break;
1508         default:
1509                 dev_warn(&device->cdev->dev, "An I/O control call used "
1510                          "incorrect flags 0x%x\n", fdata->intensity);
1511                 return ERR_PTR(-EINVAL);
1512         }
1513         /* Allocate the format ccw request. */
1514         fcp = dasd_smalloc_request(dasd_eckd_discipline.name,
1515                                    cplength, datasize, device);
1516         if (IS_ERR(fcp))
1517                 return fcp;
1518
1519         data = fcp->data;
1520         ccw = fcp->cpaddr;
1521
1522         switch (intensity & ~0x08) {
1523         case 0x00: /* Normal format. */
1524                 define_extent(ccw++, (struct DE_eckd_data *) data,
1525                               fdata->start_unit, fdata->start_unit,
1526                               DASD_ECKD_CCW_WRITE_CKD, device);
1527                 /* grant subsystem permission to format R0 */
1528                 if (r0_perm)
1529                         ((struct DE_eckd_data *)data)->ga_extended |= 0x04;
1530                 data += sizeof(struct DE_eckd_data);
1531                 ccw[-1].flags |= CCW_FLAG_CC;
1532                 locate_record(ccw++, (struct LO_eckd_data *) data,
1533                               fdata->start_unit, 0, rpt,
1534                               DASD_ECKD_CCW_WRITE_CKD, device,
1535                               fdata->blksize);
1536                 data += sizeof(struct LO_eckd_data);
1537                 break;
1538         case 0x01: /* Write record zero + format track. */
1539                 define_extent(ccw++, (struct DE_eckd_data *) data,
1540                               fdata->start_unit, fdata->start_unit,
1541                               DASD_ECKD_CCW_WRITE_RECORD_ZERO,
1542                               device);
1543                 data += sizeof(struct DE_eckd_data);
1544                 ccw[-1].flags |= CCW_FLAG_CC;
1545                 locate_record(ccw++, (struct LO_eckd_data *) data,
1546                               fdata->start_unit, 0, rpt + 1,
1547                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
1548                               device->block->bp_block);
1549                 data += sizeof(struct LO_eckd_data);
1550                 break;
1551         case 0x04: /* Invalidate track. */
1552                 define_extent(ccw++, (struct DE_eckd_data *) data,
1553                               fdata->start_unit, fdata->start_unit,
1554                               DASD_ECKD_CCW_WRITE_CKD, device);
1555                 data += sizeof(struct DE_eckd_data);
1556                 ccw[-1].flags |= CCW_FLAG_CC;
1557                 locate_record(ccw++, (struct LO_eckd_data *) data,
1558                               fdata->start_unit, 0, 1,
1559                               DASD_ECKD_CCW_WRITE_CKD, device, 8);
1560                 data += sizeof(struct LO_eckd_data);
1561                 break;
1562         }
1563         if (intensity & 0x01) { /* write record zero */
1564                 ect = (struct eckd_count *) data;
1565                 data += sizeof(struct eckd_count);
1566                 ect->cyl = address.cyl;
1567                 ect->head = address.head;
1568                 ect->record = 0;
1569                 ect->kl = 0;
1570                 ect->dl = 8;
1571                 ccw[-1].flags |= CCW_FLAG_CC;
1572                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
1573                 ccw->flags = CCW_FLAG_SLI;
1574                 ccw->count = 8;
1575                 ccw->cda = (__u32)(addr_t) ect;
1576                 ccw++;
1577         }
1578         if ((intensity & ~0x08) & 0x04) {       /* erase track */
1579                 ect = (struct eckd_count *) data;
1580                 data += sizeof(struct eckd_count);
1581                 ect->cyl = address.cyl;
1582                 ect->head = address.head;
1583                 ect->record = 1;
1584                 ect->kl = 0;
1585                 ect->dl = 0;
1586                 ccw[-1].flags |= CCW_FLAG_CC;
1587                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1588                 ccw->flags = CCW_FLAG_SLI;
1589                 ccw->count = 8;
1590                 ccw->cda = (__u32)(addr_t) ect;
1591         } else {                /* write remaining records */
1592                 for (i = 0; i < rpt; i++) {
1593                         ect = (struct eckd_count *) data;
1594                         data += sizeof(struct eckd_count);
1595                         ect->cyl = address.cyl;
1596                         ect->head = address.head;
1597                         ect->record = i + 1;
1598                         ect->kl = 0;
1599                         ect->dl = fdata->blksize;
1600                         /* Check for special tracks 0-1 when formatting CDL */
1601                         if ((intensity & 0x08) &&
1602                             fdata->start_unit == 0) {
1603                                 if (i < 3) {
1604                                         ect->kl = 4;
1605                                         ect->dl = sizes_trk0[i] - 4;
1606                                 }
1607                         }
1608                         if ((intensity & 0x08) &&
1609                             fdata->start_unit == 1) {
1610                                 ect->kl = 44;
1611                                 ect->dl = LABEL_SIZE - 44;
1612                         }
1613                         ccw[-1].flags |= CCW_FLAG_CC;
1614                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1615                         ccw->flags = CCW_FLAG_SLI;
1616                         ccw->count = 8;
1617                         ccw->cda = (__u32)(addr_t) ect;
1618                         ccw++;
1619                 }
1620         }
1621         fcp->startdev = device;
1622         fcp->memdev = device;
1623         clear_bit(DASD_CQR_FLAGS_USE_ERP, &fcp->flags);
1624         fcp->retries = 5;       /* set retry counter to enable default ERP */
1625         fcp->buildclk = get_clock();
1626         fcp->status = DASD_CQR_FILLED;
1627         return fcp;
1628 }
1629
1630 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
1631 {
1632         cqr->status = DASD_CQR_FILLED;
1633         if (cqr->block && (cqr->startdev != cqr->block->base)) {
1634                 dasd_eckd_reset_ccw_to_base_io(cqr);
1635                 cqr->startdev = cqr->block->base;
1636         }
1637 };
1638
1639 static dasd_erp_fn_t
1640 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
1641 {
1642         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
1643         struct ccw_device *cdev = device->cdev;
1644
1645         switch (cdev->id.cu_type) {
1646         case 0x3990:
1647         case 0x2105:
1648         case 0x2107:
1649         case 0x1750:
1650                 return dasd_3990_erp_action;
1651         case 0x9343:
1652         case 0x3880:
1653         default:
1654                 return dasd_default_erp_action;
1655         }
1656 }
1657
1658 static dasd_erp_fn_t
1659 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
1660 {
1661         return dasd_default_erp_postaction;
1662 }
1663
1664
1665 static void dasd_eckd_handle_unsolicited_interrupt(struct dasd_device *device,
1666                                                    struct irb *irb)
1667 {
1668         char mask;
1669         char *sense = NULL;
1670
1671         /* first of all check for state change pending interrupt */
1672         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
1673         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
1674                 dasd_generic_handle_state_change(device);
1675                 return;
1676         }
1677
1678         /* summary unit check */
1679         if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
1680             (irb->ecw[7] == 0x0D)) {
1681                 dasd_alias_handle_summary_unit_check(device, irb);
1682                 return;
1683         }
1684
1685         sense = dasd_get_sense(irb);
1686         /* service information message SIM */
1687         if (sense && !(sense[27] & DASD_SENSE_BIT_0) &&
1688             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
1689                 dasd_3990_erp_handle_sim(device, sense);
1690                 dasd_schedule_device_bh(device);
1691                 return;
1692         }
1693
1694         if ((scsw_cc(&irb->scsw) == 1) &&
1695             (scsw_fctl(&irb->scsw) & SCSW_FCTL_START_FUNC) &&
1696             (scsw_actl(&irb->scsw) & SCSW_ACTL_START_PEND) &&
1697             (scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND)) {
1698                 /* fake irb do nothing, they are handled elsewhere */
1699                 dasd_schedule_device_bh(device);
1700                 return;
1701         }
1702
1703         if (!sense) {
1704                 /* just report other unsolicited interrupts */
1705                 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1706                             "unsolicited interrupt received");
1707         } else {
1708                 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1709                             "unsolicited interrupt received "
1710                             "(sense available)");
1711                 device->discipline->dump_sense_dbf(device, NULL, irb,
1712                                                    "unsolicited");
1713         }
1714
1715         dasd_schedule_device_bh(device);
1716         return;
1717 };
1718
1719
1720 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
1721                                                struct dasd_device *startdev,
1722                                                struct dasd_block *block,
1723                                                struct request *req,
1724                                                sector_t first_rec,
1725                                                sector_t last_rec,
1726                                                sector_t first_trk,
1727                                                sector_t last_trk,
1728                                                unsigned int first_offs,
1729                                                unsigned int last_offs,
1730                                                unsigned int blk_per_trk,
1731                                                unsigned int blksize)
1732 {
1733         struct dasd_eckd_private *private;
1734         unsigned long *idaws;
1735         struct LO_eckd_data *LO_data;
1736         struct dasd_ccw_req *cqr;
1737         struct ccw1 *ccw;
1738         struct req_iterator iter;
1739         struct bio_vec *bv;
1740         char *dst;
1741         unsigned int off;
1742         int count, cidaw, cplength, datasize;
1743         sector_t recid;
1744         unsigned char cmd, rcmd;
1745         int use_prefix;
1746         struct dasd_device *basedev;
1747
1748         basedev = block->base;
1749         private = (struct dasd_eckd_private *) basedev->private;
1750         if (rq_data_dir(req) == READ)
1751                 cmd = DASD_ECKD_CCW_READ_MT;
1752         else if (rq_data_dir(req) == WRITE)
1753                 cmd = DASD_ECKD_CCW_WRITE_MT;
1754         else
1755                 return ERR_PTR(-EINVAL);
1756
1757         /* Check struct bio and count the number of blocks for the request. */
1758         count = 0;
1759         cidaw = 0;
1760         rq_for_each_segment(bv, req, iter) {
1761                 if (bv->bv_len & (blksize - 1))
1762                         /* Eckd can only do full blocks. */
1763                         return ERR_PTR(-EINVAL);
1764                 count += bv->bv_len >> (block->s2b_shift + 9);
1765 #if defined(CONFIG_64BIT)
1766                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
1767                         cidaw += bv->bv_len >> (block->s2b_shift + 9);
1768 #endif
1769         }
1770         /* Paranoia. */
1771         if (count != last_rec - first_rec + 1)
1772                 return ERR_PTR(-EINVAL);
1773
1774         /* use the prefix command if available */
1775         use_prefix = private->features.feature[8] & 0x01;
1776         if (use_prefix) {
1777                 /* 1x prefix + number of blocks */
1778                 cplength = 2 + count;
1779                 /* 1x prefix + cidaws*sizeof(long) */
1780                 datasize = sizeof(struct PFX_eckd_data) +
1781                         sizeof(struct LO_eckd_data) +
1782                         cidaw * sizeof(unsigned long);
1783         } else {
1784                 /* 1x define extent + 1x locate record + number of blocks */
1785                 cplength = 2 + count;
1786                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
1787                 datasize = sizeof(struct DE_eckd_data) +
1788                         sizeof(struct LO_eckd_data) +
1789                         cidaw * sizeof(unsigned long);
1790         }
1791         /* Find out the number of additional locate record ccws for cdl. */
1792         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
1793                 if (last_rec >= 2*blk_per_trk)
1794                         count = 2*blk_per_trk - first_rec;
1795                 cplength += count;
1796                 datasize += count*sizeof(struct LO_eckd_data);
1797         }
1798         /* Allocate the ccw request. */
1799         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1800                                    cplength, datasize, startdev);
1801         if (IS_ERR(cqr))
1802                 return cqr;
1803         ccw = cqr->cpaddr;
1804         /* First ccw is define extent or prefix. */
1805         if (use_prefix) {
1806                 if (prefix(ccw++, cqr->data, first_trk,
1807                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
1808                         /* Clock not in sync and XRC is enabled.
1809                          * Try again later.
1810                          */
1811                         dasd_sfree_request(cqr, startdev);
1812                         return ERR_PTR(-EAGAIN);
1813                 }
1814                 idaws = (unsigned long *) (cqr->data +
1815                                            sizeof(struct PFX_eckd_data));
1816         } else {
1817                 if (define_extent(ccw++, cqr->data, first_trk,
1818                                   last_trk, cmd, startdev) == -EAGAIN) {
1819                         /* Clock not in sync and XRC is enabled.
1820                          * Try again later.
1821                          */
1822                         dasd_sfree_request(cqr, startdev);
1823                         return ERR_PTR(-EAGAIN);
1824                 }
1825                 idaws = (unsigned long *) (cqr->data +
1826                                            sizeof(struct DE_eckd_data));
1827         }
1828         /* Build locate_record+read/write/ccws. */
1829         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
1830         recid = first_rec;
1831         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
1832                 /* Only standard blocks so there is just one locate record. */
1833                 ccw[-1].flags |= CCW_FLAG_CC;
1834                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
1835                               last_rec - recid + 1, cmd, basedev, blksize);
1836         }
1837         rq_for_each_segment(bv, req, iter) {
1838                 dst = page_address(bv->bv_page) + bv->bv_offset;
1839                 if (dasd_page_cache) {
1840                         char *copy = kmem_cache_alloc(dasd_page_cache,
1841                                                       GFP_DMA | __GFP_NOWARN);
1842                         if (copy && rq_data_dir(req) == WRITE)
1843                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
1844                         if (copy)
1845                                 dst = copy + bv->bv_offset;
1846                 }
1847                 for (off = 0; off < bv->bv_len; off += blksize) {
1848                         sector_t trkid = recid;
1849                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
1850                         rcmd = cmd;
1851                         count = blksize;
1852                         /* Locate record for cdl special block ? */
1853                         if (private->uses_cdl && recid < 2*blk_per_trk) {
1854                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
1855                                         rcmd |= 0x8;
1856                                         count = dasd_eckd_cdl_reclen(recid);
1857                                         if (count < blksize &&
1858                                             rq_data_dir(req) == READ)
1859                                                 memset(dst + count, 0xe5,
1860                                                        blksize - count);
1861                                 }
1862                                 ccw[-1].flags |= CCW_FLAG_CC;
1863                                 locate_record(ccw++, LO_data++,
1864                                               trkid, recoffs + 1,
1865                                               1, rcmd, basedev, count);
1866                         }
1867                         /* Locate record for standard blocks ? */
1868                         if (private->uses_cdl && recid == 2*blk_per_trk) {
1869                                 ccw[-1].flags |= CCW_FLAG_CC;
1870                                 locate_record(ccw++, LO_data++,
1871                                               trkid, recoffs + 1,
1872                                               last_rec - recid + 1,
1873                                               cmd, basedev, count);
1874                         }
1875                         /* Read/write ccw. */
1876                         ccw[-1].flags |= CCW_FLAG_CC;
1877                         ccw->cmd_code = rcmd;
1878                         ccw->count = count;
1879                         if (idal_is_needed(dst, blksize)) {
1880                                 ccw->cda = (__u32)(addr_t) idaws;
1881                                 ccw->flags = CCW_FLAG_IDA;
1882                                 idaws = idal_create_words(idaws, dst, blksize);
1883                         } else {
1884                                 ccw->cda = (__u32)(addr_t) dst;
1885                                 ccw->flags = 0;
1886                         }
1887                         ccw++;
1888                         dst += blksize;
1889                         recid++;
1890                 }
1891         }
1892         if (blk_noretry_request(req) ||
1893             block->base->features & DASD_FEATURE_FAILFAST)
1894                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1895         cqr->startdev = startdev;
1896         cqr->memdev = startdev;
1897         cqr->block = block;
1898         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
1899         cqr->lpm = private->path_data.ppm;
1900         cqr->retries = 256;
1901         cqr->buildclk = get_clock();
1902         cqr->status = DASD_CQR_FILLED;
1903         return cqr;
1904 }
1905
1906 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
1907                                                struct dasd_device *startdev,
1908                                                struct dasd_block *block,
1909                                                struct request *req,
1910                                                sector_t first_rec,
1911                                                sector_t last_rec,
1912                                                sector_t first_trk,
1913                                                sector_t last_trk,
1914                                                unsigned int first_offs,
1915                                                unsigned int last_offs,
1916                                                unsigned int blk_per_trk,
1917                                                unsigned int blksize)
1918 {
1919         struct dasd_eckd_private *private;
1920         unsigned long *idaws;
1921         struct dasd_ccw_req *cqr;
1922         struct ccw1 *ccw;
1923         struct req_iterator iter;
1924         struct bio_vec *bv;
1925         char *dst, *idaw_dst;
1926         unsigned int cidaw, cplength, datasize;
1927         unsigned int tlf;
1928         sector_t recid;
1929         unsigned char cmd;
1930         struct dasd_device *basedev;
1931         unsigned int trkcount, count, count_to_trk_end;
1932         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
1933         unsigned char new_track, end_idaw;
1934         sector_t trkid;
1935         unsigned int recoffs;
1936
1937         basedev = block->base;
1938         private = (struct dasd_eckd_private *) basedev->private;
1939         if (rq_data_dir(req) == READ)
1940                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
1941         else if (rq_data_dir(req) == WRITE)
1942                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
1943         else
1944                 return ERR_PTR(-EINVAL);
1945
1946         /* Track based I/O needs IDAWs for each page, and not just for
1947          * 64 bit addresses. We need additional idals for pages
1948          * that get filled from two tracks, so we use the number
1949          * of records as upper limit.
1950          */
1951         cidaw = last_rec - first_rec + 1;
1952         trkcount = last_trk - first_trk + 1;
1953
1954         /* 1x prefix + one read/write ccw per track */
1955         cplength = 1 + trkcount;
1956
1957         /* on 31-bit we need space for two 32 bit addresses per page
1958          * on 64-bit one 64 bit address
1959          */
1960         datasize = sizeof(struct PFX_eckd_data) +
1961                 cidaw * sizeof(unsigned long long);
1962
1963         /* Allocate the ccw request. */
1964         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1965                                    cplength, datasize, startdev);
1966         if (IS_ERR(cqr))
1967                 return cqr;
1968         ccw = cqr->cpaddr;
1969         /* transfer length factor: how many bytes to read from the last track */
1970         if (first_trk == last_trk)
1971                 tlf = last_offs - first_offs + 1;
1972         else
1973                 tlf = last_offs + 1;
1974         tlf *= blksize;
1975
1976         if (prefix_LRE(ccw++, cqr->data, first_trk,
1977                        last_trk, cmd, basedev, startdev,
1978                        1 /* format */, first_offs + 1,
1979                        trkcount, blksize,
1980                        tlf) == -EAGAIN) {
1981                 /* Clock not in sync and XRC is enabled.
1982                  * Try again later.
1983                  */
1984                 dasd_sfree_request(cqr, startdev);
1985                 return ERR_PTR(-EAGAIN);
1986         }
1987
1988         /*
1989          * The translation of request into ccw programs must meet the
1990          * following conditions:
1991          * - all idaws but the first and the last must address full pages
1992          *   (or 2K blocks on 31-bit)
1993          * - the scope of a ccw and it's idal ends with the track boundaries
1994          */
1995         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
1996         recid = first_rec;
1997         new_track = 1;
1998         end_idaw = 0;
1999         len_to_track_end = 0;
2000         idaw_dst = 0;
2001         idaw_len = 0;
2002         rq_for_each_segment(bv, req, iter) {
2003                 dst = page_address(bv->bv_page) + bv->bv_offset;
2004                 seg_len = bv->bv_len;
2005                 while (seg_len) {
2006                         if (new_track) {
2007                                 trkid = recid;
2008                                 recoffs = sector_div(trkid, blk_per_trk);
2009                                 count_to_trk_end = blk_per_trk - recoffs;
2010                                 count = min((last_rec - recid + 1),
2011                                             (sector_t)count_to_trk_end);
2012                                 len_to_track_end = count * blksize;
2013                                 ccw[-1].flags |= CCW_FLAG_CC;
2014                                 ccw->cmd_code = cmd;
2015                                 ccw->count = len_to_track_end;
2016                                 ccw->cda = (__u32)(addr_t)idaws;
2017                                 ccw->flags = CCW_FLAG_IDA;
2018                                 ccw++;
2019                                 recid += count;
2020                                 new_track = 0;
2021                                 /* first idaw for a ccw may start anywhere */
2022                                 if (!idaw_dst)
2023                                         idaw_dst = dst;
2024                         }
2025                         /* If we start a new idaw, we must make sure that it
2026                          * starts on an IDA_BLOCK_SIZE boundary.
2027                          * If we continue an idaw, we must make sure that the
2028                          * current segment begins where the so far accumulated
2029                          * idaw ends
2030                          */
2031                         if (!idaw_dst) {
2032                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2033                                         dasd_sfree_request(cqr, startdev);
2034                                         return ERR_PTR(-ERANGE);
2035                                 } else
2036                                         idaw_dst = dst;
2037                         }
2038                         if ((idaw_dst + idaw_len) != dst) {
2039                                 dasd_sfree_request(cqr, startdev);
2040                                 return ERR_PTR(-ERANGE);
2041                         }
2042                         part_len = min(seg_len, len_to_track_end);
2043                         seg_len -= part_len;
2044                         dst += part_len;
2045                         idaw_len += part_len;
2046                         len_to_track_end -= part_len;
2047                         /* collected memory area ends on an IDA_BLOCK border,
2048                          * -> create an idaw
2049                          * idal_create_words will handle cases where idaw_len
2050                          * is larger then IDA_BLOCK_SIZE
2051                          */
2052                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2053                                 end_idaw = 1;
2054                         /* We also need to end the idaw at track end */
2055                         if (!len_to_track_end) {
2056                                 new_track = 1;
2057                                 end_idaw = 1;
2058                         }
2059                         if (end_idaw) {
2060                                 idaws = idal_create_words(idaws, idaw_dst,
2061                                                           idaw_len);
2062                                 idaw_dst = 0;
2063                                 idaw_len = 0;
2064                                 end_idaw = 0;
2065                         }
2066                 }
2067         }
2068
2069         if (blk_noretry_request(req) ||
2070             block->base->features & DASD_FEATURE_FAILFAST)
2071                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2072         cqr->startdev = startdev;
2073         cqr->memdev = startdev;
2074         cqr->block = block;
2075         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
2076         cqr->lpm = private->path_data.ppm;
2077         cqr->retries = 256;
2078         cqr->buildclk = get_clock();
2079         cqr->status = DASD_CQR_FILLED;
2080         return cqr;
2081 }
2082
2083 static int prepare_itcw(struct itcw *itcw,
2084                         unsigned int trk, unsigned int totrk, int cmd,
2085                         struct dasd_device *basedev,
2086                         struct dasd_device *startdev,
2087                         unsigned int rec_on_trk, int count,
2088                         unsigned int blksize,
2089                         unsigned int total_data_size,
2090                         unsigned int tlf,
2091                         unsigned int blk_per_trk)
2092 {
2093         struct PFX_eckd_data pfxdata;
2094         struct dasd_eckd_private *basepriv, *startpriv;
2095         struct DE_eckd_data *dedata;
2096         struct LRE_eckd_data *lredata;
2097         struct dcw *dcw;
2098
2099         u32 begcyl, endcyl;
2100         u16 heads, beghead, endhead;
2101         u8 pfx_cmd;
2102
2103         int rc = 0;
2104         int sector = 0;
2105         int dn, d;
2106
2107
2108         /* setup prefix data */
2109         basepriv = (struct dasd_eckd_private *) basedev->private;
2110         startpriv = (struct dasd_eckd_private *) startdev->private;
2111         dedata = &pfxdata.define_extent;
2112         lredata = &pfxdata.locate_record;
2113
2114         memset(&pfxdata, 0, sizeof(pfxdata));
2115         pfxdata.format = 1; /* PFX with LRE */
2116         pfxdata.base_address = basepriv->ned->unit_addr;
2117         pfxdata.base_lss = basepriv->ned->ID;
2118         pfxdata.validity.define_extent = 1;
2119
2120         /* private uid is kept up to date, conf_data may be outdated */
2121         if (startpriv->uid.type != UA_BASE_DEVICE) {
2122                 pfxdata.validity.verify_base = 1;
2123                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2124                         pfxdata.validity.hyper_pav = 1;
2125         }
2126
2127         switch (cmd) {
2128         case DASD_ECKD_CCW_READ_TRACK_DATA:
2129                 dedata->mask.perm = 0x1;
2130                 dedata->attributes.operation = basepriv->attrib.operation;
2131                 dedata->blk_size = blksize;
2132                 dedata->ga_extended |= 0x42;
2133                 lredata->operation.orientation = 0x0;
2134                 lredata->operation.operation = 0x0C;
2135                 lredata->auxiliary.check_bytes = 0x01;
2136                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2137                 break;
2138         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2139                 dedata->mask.perm = 0x02;
2140                 dedata->attributes.operation = basepriv->attrib.operation;
2141                 dedata->blk_size = blksize;
2142                 rc = check_XRC_on_prefix(&pfxdata, basedev);
2143                 dedata->ga_extended |= 0x42;
2144                 lredata->operation.orientation = 0x0;
2145                 lredata->operation.operation = 0x3F;
2146                 lredata->extended_operation = 0x23;
2147                 lredata->auxiliary.check_bytes = 0x2;
2148                 pfx_cmd = DASD_ECKD_CCW_PFX;
2149                 break;
2150         default:
2151                 DBF_DEV_EVENT(DBF_ERR, basedev,
2152                               "prepare itcw, unknown opcode 0x%x", cmd);
2153                 BUG();
2154                 break;
2155         }
2156         if (rc)
2157                 return rc;
2158
2159         dedata->attributes.mode = 0x3;  /* ECKD */
2160
2161         heads = basepriv->rdc_data.trk_per_cyl;
2162         begcyl = trk / heads;
2163         beghead = trk % heads;
2164         endcyl = totrk / heads;
2165         endhead = totrk % heads;
2166
2167         /* check for sequential prestage - enhance cylinder range */
2168         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2169             dedata->attributes.operation == DASD_SEQ_ACCESS) {
2170
2171                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2172                         endcyl += basepriv->attrib.nr_cyl;
2173                 else
2174                         endcyl = (basepriv->real_cyl - 1);
2175         }
2176
2177         set_ch_t(&dedata->beg_ext, begcyl, beghead);
2178         set_ch_t(&dedata->end_ext, endcyl, endhead);
2179
2180         dedata->ep_format = 0x20; /* records per track is valid */
2181         dedata->ep_rec_per_track = blk_per_trk;
2182
2183         if (rec_on_trk) {
2184                 switch (basepriv->rdc_data.dev_type) {
2185                 case 0x3390:
2186                         dn = ceil_quot(blksize + 6, 232);
2187                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
2188                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
2189                         break;
2190                 case 0x3380:
2191                         d = 7 + ceil_quot(blksize + 12, 32);
2192                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
2193                         break;
2194                 }
2195         }
2196
2197         lredata->auxiliary.length_valid = 1;
2198         lredata->auxiliary.length_scope = 1;
2199         lredata->auxiliary.imbedded_ccw_valid = 1;
2200         lredata->length = tlf;
2201         lredata->imbedded_ccw = cmd;
2202         lredata->count = count;
2203         lredata->sector = sector;
2204         set_ch_t(&lredata->seek_addr, begcyl, beghead);
2205         lredata->search_arg.cyl = lredata->seek_addr.cyl;
2206         lredata->search_arg.head = lredata->seek_addr.head;
2207         lredata->search_arg.record = rec_on_trk;
2208
2209         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
2210                      &pfxdata, sizeof(pfxdata), total_data_size);
2211
2212         return rc;
2213 }
2214
2215 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
2216                                                struct dasd_device *startdev,
2217                                                struct dasd_block *block,
2218                                                struct request *req,
2219                                                sector_t first_rec,
2220                                                sector_t last_rec,
2221                                                sector_t first_trk,
2222                                                sector_t last_trk,
2223                                                unsigned int first_offs,
2224                                                unsigned int last_offs,
2225                                                unsigned int blk_per_trk,
2226                                                unsigned int blksize)
2227 {
2228         struct dasd_eckd_private *private;
2229         struct dasd_ccw_req *cqr;
2230         struct req_iterator iter;
2231         struct bio_vec *bv;
2232         char *dst;
2233         unsigned int trkcount, ctidaw;
2234         unsigned char cmd;
2235         struct dasd_device *basedev;
2236         unsigned int tlf;
2237         struct itcw *itcw;
2238         struct tidaw *last_tidaw = NULL;
2239         int itcw_op;
2240         size_t itcw_size;
2241
2242         basedev = block->base;
2243         private = (struct dasd_eckd_private *) basedev->private;
2244         if (rq_data_dir(req) == READ) {
2245                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2246                 itcw_op = ITCW_OP_READ;
2247         } else if (rq_data_dir(req) == WRITE) {
2248                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2249                 itcw_op = ITCW_OP_WRITE;
2250         } else
2251                 return ERR_PTR(-EINVAL);
2252
2253         /* trackbased I/O needs address all memory via TIDAWs,
2254          * not just for 64 bit addresses. This allows us to map
2255          * each segment directly to one tidaw.
2256          */
2257         trkcount = last_trk - first_trk + 1;
2258         ctidaw = 0;
2259         rq_for_each_segment(bv, req, iter) {
2260                 ++ctidaw;
2261         }
2262
2263         /* Allocate the ccw request. */
2264         itcw_size = itcw_calc_size(0, ctidaw, 0);
2265         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2266                                    0, itcw_size, startdev);
2267         if (IS_ERR(cqr))
2268                 return cqr;
2269
2270         cqr->cpmode = 1;
2271         cqr->startdev = startdev;
2272         cqr->memdev = startdev;
2273         cqr->block = block;
2274         cqr->expires = 100*HZ;
2275         cqr->buildclk = get_clock();
2276         cqr->status = DASD_CQR_FILLED;
2277         cqr->retries = 10;
2278
2279         /* transfer length factor: how many bytes to read from the last track */
2280         if (first_trk == last_trk)
2281                 tlf = last_offs - first_offs + 1;
2282         else
2283                 tlf = last_offs + 1;
2284         tlf *= blksize;
2285
2286         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
2287         cqr->cpaddr = itcw_get_tcw(itcw);
2288
2289         if (prepare_itcw(itcw, first_trk, last_trk,
2290                          cmd, basedev, startdev,
2291                          first_offs + 1,
2292                          trkcount, blksize,
2293                          (last_rec - first_rec + 1) * blksize,
2294                          tlf, blk_per_trk) == -EAGAIN) {
2295                 /* Clock not in sync and XRC is enabled.
2296                  * Try again later.
2297                  */
2298                 dasd_sfree_request(cqr, startdev);
2299                 return ERR_PTR(-EAGAIN);
2300         }
2301
2302         /*
2303          * A tidaw can address 4k of memory, but must not cross page boundaries
2304          * We can let the block layer handle this by setting
2305          * blk_queue_segment_boundary to page boundaries and
2306          * blk_max_segment_size to page size when setting up the request queue.
2307          */
2308         rq_for_each_segment(bv, req, iter) {
2309                 dst = page_address(bv->bv_page) + bv->bv_offset;
2310                 last_tidaw = itcw_add_tidaw(itcw, 0x00, dst, bv->bv_len);
2311                 if (IS_ERR(last_tidaw))
2312                         return (struct dasd_ccw_req *)last_tidaw;
2313         }
2314
2315         last_tidaw->flags |= 0x80;
2316         itcw_finalize(itcw);
2317
2318         if (blk_noretry_request(req) ||
2319             block->base->features & DASD_FEATURE_FAILFAST)
2320                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2321         cqr->startdev = startdev;
2322         cqr->memdev = startdev;
2323         cqr->block = block;
2324         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
2325         cqr->lpm = private->path_data.ppm;
2326         cqr->retries = 256;
2327         cqr->buildclk = get_clock();
2328         cqr->status = DASD_CQR_FILLED;
2329         return cqr;
2330 }
2331
2332 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
2333                                                struct dasd_block *block,
2334                                                struct request *req)
2335 {
2336         int tpm, cmdrtd, cmdwtd;
2337         int use_prefix;
2338 #if defined(CONFIG_64BIT)
2339         int fcx_in_css, fcx_in_gneq, fcx_in_features;
2340 #endif
2341         struct dasd_eckd_private *private;
2342         struct dasd_device *basedev;
2343         sector_t first_rec, last_rec;
2344         sector_t first_trk, last_trk;
2345         unsigned int first_offs, last_offs;
2346         unsigned int blk_per_trk, blksize;
2347         int cdlspecial;
2348         struct dasd_ccw_req *cqr;
2349
2350         basedev = block->base;
2351         private = (struct dasd_eckd_private *) basedev->private;
2352
2353         /* Calculate number of blocks/records per track. */
2354         blksize = block->bp_block;
2355         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2356         /* Calculate record id of first and last block. */
2357         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
2358         first_offs = sector_div(first_trk, blk_per_trk);
2359         last_rec = last_trk =
2360                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
2361         last_offs = sector_div(last_trk, blk_per_trk);
2362         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
2363
2364         /* is transport mode supported? */
2365 #if defined(CONFIG_64BIT)
2366         fcx_in_css = css_general_characteristics.fcx;
2367         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
2368         fcx_in_features = private->features.feature[40] & 0x80;
2369         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
2370 #else
2371         tpm = 0;
2372 #endif
2373
2374         /* is read track data and write track data in command mode supported? */
2375         cmdrtd = private->features.feature[9] & 0x20;
2376         cmdwtd = private->features.feature[12] & 0x40;
2377         use_prefix = private->features.feature[8] & 0x01;
2378
2379         cqr = NULL;
2380         if (cdlspecial || dasd_page_cache) {
2381                 /* do nothing, just fall through to the cmd mode single case */
2382         } else if (!dasd_nofcx && tpm && (first_trk == last_trk)) {
2383                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
2384                                                     first_rec, last_rec,
2385                                                     first_trk, last_trk,
2386                                                     first_offs, last_offs,
2387                                                     blk_per_trk, blksize);
2388                 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
2389                         cqr = NULL;
2390         } else if (use_prefix &&
2391                    (((rq_data_dir(req) == READ) && cmdrtd) ||
2392                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
2393                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
2394                                                    first_rec, last_rec,
2395                                                    first_trk, last_trk,
2396                                                    first_offs, last_offs,
2397                                                    blk_per_trk, blksize);
2398                 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
2399                         cqr = NULL;
2400         }
2401         if (!cqr)
2402                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
2403                                                     first_rec, last_rec,
2404                                                     first_trk, last_trk,
2405                                                     first_offs, last_offs,
2406                                                     blk_per_trk, blksize);
2407         return cqr;
2408 }
2409
2410 static int
2411 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
2412 {
2413         struct dasd_eckd_private *private;
2414         struct ccw1 *ccw;
2415         struct req_iterator iter;
2416         struct bio_vec *bv;
2417         char *dst, *cda;
2418         unsigned int blksize, blk_per_trk, off;
2419         sector_t recid;
2420         int status;
2421
2422         if (!dasd_page_cache)
2423                 goto out;
2424         private = (struct dasd_eckd_private *) cqr->block->base->private;
2425         blksize = cqr->block->bp_block;
2426         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2427         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
2428         ccw = cqr->cpaddr;
2429         /* Skip over define extent & locate record. */
2430         ccw++;
2431         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
2432                 ccw++;
2433         rq_for_each_segment(bv, req, iter) {
2434                 dst = page_address(bv->bv_page) + bv->bv_offset;
2435                 for (off = 0; off < bv->bv_len; off += blksize) {
2436                         /* Skip locate record. */
2437                         if (private->uses_cdl && recid <= 2*blk_per_trk)
2438                                 ccw++;
2439                         if (dst) {
2440                                 if (ccw->flags & CCW_FLAG_IDA)
2441                                         cda = *((char **)((addr_t) ccw->cda));
2442                                 else
2443                                         cda = (char *)((addr_t) ccw->cda);
2444                                 if (dst != cda) {
2445                                         if (rq_data_dir(req) == READ)
2446                                                 memcpy(dst, cda, bv->bv_len);
2447                                         kmem_cache_free(dasd_page_cache,
2448                                             (void *)((addr_t)cda & PAGE_MASK));
2449                                 }
2450                                 dst = NULL;
2451                         }
2452                         ccw++;
2453                         recid++;
2454                 }
2455         }
2456 out:
2457         status = cqr->status == DASD_CQR_DONE;
2458         dasd_sfree_request(cqr, cqr->memdev);
2459         return status;
2460 }
2461
2462 /*
2463  * Modify ccw/tcw in cqr so it can be started on a base device.
2464  *
2465  * Note that this is not enough to restart the cqr!
2466  * Either reset cqr->startdev as well (summary unit check handling)
2467  * or restart via separate cqr (as in ERP handling).
2468  */
2469 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
2470 {
2471         struct ccw1 *ccw;
2472         struct PFX_eckd_data *pfxdata;
2473         struct tcw *tcw;
2474         struct tccb *tccb;
2475         struct dcw *dcw;
2476
2477         if (cqr->cpmode == 1) {
2478                 tcw = cqr->cpaddr;
2479                 tccb = tcw_get_tccb(tcw);
2480                 dcw = (struct dcw *)&tccb->tca[0];
2481                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
2482                 pfxdata->validity.verify_base = 0;
2483                 pfxdata->validity.hyper_pav = 0;
2484         } else {
2485                 ccw = cqr->cpaddr;
2486                 pfxdata = cqr->data;
2487                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
2488                         pfxdata->validity.verify_base = 0;
2489                         pfxdata->validity.hyper_pav = 0;
2490                 }
2491         }
2492 }
2493
2494 #define DASD_ECKD_CHANQ_MAX_SIZE 4
2495
2496 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
2497                                                      struct dasd_block *block,
2498                                                      struct request *req)
2499 {
2500         struct dasd_eckd_private *private;
2501         struct dasd_device *startdev;
2502         unsigned long flags;
2503         struct dasd_ccw_req *cqr;
2504
2505         startdev = dasd_alias_get_start_dev(base);
2506         if (!startdev)
2507                 startdev = base;
2508         private = (struct dasd_eckd_private *) startdev->private;
2509         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
2510                 return ERR_PTR(-EBUSY);
2511
2512         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
2513         private->count++;
2514         cqr = dasd_eckd_build_cp(startdev, block, req);
2515         if (IS_ERR(cqr))
2516                 private->count--;
2517         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
2518         return cqr;
2519 }
2520
2521 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
2522                                    struct request *req)
2523 {
2524         struct dasd_eckd_private *private;
2525         unsigned long flags;
2526
2527         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
2528         private = (struct dasd_eckd_private *) cqr->memdev->private;
2529         private->count--;
2530         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
2531         return dasd_eckd_free_cp(cqr, req);
2532 }
2533
2534 static int
2535 dasd_eckd_fill_info(struct dasd_device * device,
2536                     struct dasd_information2_t * info)
2537 {
2538         struct dasd_eckd_private *private;
2539
2540         private = (struct dasd_eckd_private *) device->private;
2541         info->label_block = 2;
2542         info->FBA_layout = private->uses_cdl ? 0 : 1;
2543         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
2544         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
2545         memcpy(info->characteristics, &private->rdc_data,
2546                sizeof(struct dasd_eckd_characteristics));
2547         info->confdata_size = min((unsigned long)private->conf_len,
2548                                   sizeof(info->configuration_data));
2549         memcpy(info->configuration_data, private->conf_data,
2550                info->confdata_size);
2551         return 0;
2552 }
2553
2554 /*
2555  * SECTION: ioctl functions for eckd devices.
2556  */
2557
2558 /*
2559  * Release device ioctl.
2560  * Buils a channel programm to releases a prior reserved
2561  * (see dasd_eckd_reserve) device.
2562  */
2563 static int
2564 dasd_eckd_release(struct dasd_device *device)
2565 {
2566         struct dasd_ccw_req *cqr;
2567         int rc;
2568         struct ccw1 *ccw;
2569
2570         if (!capable(CAP_SYS_ADMIN))
2571                 return -EACCES;
2572
2573         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2574                                    1, 32, device);
2575         if (IS_ERR(cqr)) {
2576                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2577                             "Could not allocate initialization request");
2578                 return PTR_ERR(cqr);
2579         }
2580         ccw = cqr->cpaddr;
2581         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
2582         ccw->flags |= CCW_FLAG_SLI;
2583         ccw->count = 32;
2584         ccw->cda = (__u32)(addr_t) cqr->data;
2585         cqr->startdev = device;
2586         cqr->memdev = device;
2587         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2588         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2589         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2590         cqr->expires = 2 * HZ;
2591         cqr->buildclk = get_clock();
2592         cqr->status = DASD_CQR_FILLED;
2593
2594         rc = dasd_sleep_on_immediatly(cqr);
2595
2596         dasd_sfree_request(cqr, cqr->memdev);
2597         return rc;
2598 }
2599
2600 /*
2601  * Reserve device ioctl.
2602  * Options are set to 'synchronous wait for interrupt' and
2603  * 'timeout the request'. This leads to a terminate IO if
2604  * the interrupt is outstanding for a certain time.
2605  */
2606 static int
2607 dasd_eckd_reserve(struct dasd_device *device)
2608 {
2609         struct dasd_ccw_req *cqr;
2610         int rc;
2611         struct ccw1 *ccw;
2612
2613         if (!capable(CAP_SYS_ADMIN))
2614                 return -EACCES;
2615
2616         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2617                                    1, 32, device);
2618         if (IS_ERR(cqr)) {
2619                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2620                             "Could not allocate initialization request");
2621                 return PTR_ERR(cqr);
2622         }
2623         ccw = cqr->cpaddr;
2624         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
2625         ccw->flags |= CCW_FLAG_SLI;
2626         ccw->count = 32;
2627         ccw->cda = (__u32)(addr_t) cqr->data;
2628         cqr->startdev = device;
2629         cqr->memdev = device;
2630         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2631         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2632         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2633         cqr->expires = 2 * HZ;
2634         cqr->buildclk = get_clock();
2635         cqr->status = DASD_CQR_FILLED;
2636
2637         rc = dasd_sleep_on_immediatly(cqr);
2638
2639         dasd_sfree_request(cqr, cqr->memdev);
2640         return rc;
2641 }
2642
2643 /*
2644  * Steal lock ioctl - unconditional reserve device.
2645  * Buils a channel programm to break a device's reservation.
2646  * (unconditional reserve)
2647  */
2648 static int
2649 dasd_eckd_steal_lock(struct dasd_device *device)
2650 {
2651         struct dasd_ccw_req *cqr;
2652         int rc;
2653         struct ccw1 *ccw;
2654
2655         if (!capable(CAP_SYS_ADMIN))
2656                 return -EACCES;
2657
2658         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2659                                    1, 32, device);
2660         if (IS_ERR(cqr)) {
2661                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2662                             "Could not allocate initialization request");
2663                 return PTR_ERR(cqr);
2664         }
2665         ccw = cqr->cpaddr;
2666         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
2667         ccw->flags |= CCW_FLAG_SLI;
2668         ccw->count = 32;
2669         ccw->cda = (__u32)(addr_t) cqr->data;
2670         cqr->startdev = device;
2671         cqr->memdev = device;
2672         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2673         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2674         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2675         cqr->expires = 2 * HZ;
2676         cqr->buildclk = get_clock();
2677         cqr->status = DASD_CQR_FILLED;
2678
2679         rc = dasd_sleep_on_immediatly(cqr);
2680
2681         dasd_sfree_request(cqr, cqr->memdev);
2682         return rc;
2683 }
2684
2685 /*
2686  * Read performance statistics
2687  */
2688 static int
2689 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
2690 {
2691         struct dasd_psf_prssd_data *prssdp;
2692         struct dasd_rssd_perf_stats_t *stats;
2693         struct dasd_ccw_req *cqr;
2694         struct ccw1 *ccw;
2695         int rc;
2696
2697         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2698                                    1 /* PSF */  + 1 /* RSSD */ ,
2699                                    (sizeof(struct dasd_psf_prssd_data) +
2700                                     sizeof(struct dasd_rssd_perf_stats_t)),
2701                                    device);
2702         if (IS_ERR(cqr)) {
2703                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2704                             "Could not allocate initialization request");
2705                 return PTR_ERR(cqr);
2706         }
2707         cqr->startdev = device;
2708         cqr->memdev = device;
2709         cqr->retries = 0;
2710         cqr->expires = 10 * HZ;
2711
2712         /* Prepare for Read Subsystem Data */
2713         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
2714         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
2715         prssdp->order = PSF_ORDER_PRSSD;
2716         prssdp->suborder = 0x01;        /* Performance Statistics */
2717         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
2718
2719         ccw = cqr->cpaddr;
2720         ccw->cmd_code = DASD_ECKD_CCW_PSF;
2721         ccw->count = sizeof(struct dasd_psf_prssd_data);
2722         ccw->flags |= CCW_FLAG_CC;
2723         ccw->cda = (__u32)(addr_t) prssdp;
2724
2725         /* Read Subsystem Data - Performance Statistics */
2726         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
2727         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
2728
2729         ccw++;
2730         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
2731         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
2732         ccw->cda = (__u32)(addr_t) stats;
2733
2734         cqr->buildclk = get_clock();
2735         cqr->status = DASD_CQR_FILLED;
2736         rc = dasd_sleep_on(cqr);
2737         if (rc == 0) {
2738                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
2739                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
2740                 if (copy_to_user(argp, stats,
2741                                  sizeof(struct dasd_rssd_perf_stats_t)))
2742                         rc = -EFAULT;
2743         }
2744         dasd_sfree_request(cqr, cqr->memdev);
2745         return rc;
2746 }
2747
2748 /*
2749  * Get attributes (cache operations)
2750  * Returnes the cache attributes used in Define Extend (DE).
2751  */
2752 static int
2753 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
2754 {
2755         struct dasd_eckd_private *private =
2756                 (struct dasd_eckd_private *)device->private;
2757         struct attrib_data_t attrib = private->attrib;
2758         int rc;
2759
2760         if (!capable(CAP_SYS_ADMIN))
2761                 return -EACCES;
2762         if (!argp)
2763                 return -EINVAL;
2764
2765         rc = 0;
2766         if (copy_to_user(argp, (long *) &attrib,
2767                          sizeof(struct attrib_data_t)))
2768                 rc = -EFAULT;
2769
2770         return rc;
2771 }
2772
2773 /*
2774  * Set attributes (cache operations)
2775  * Stores the attributes for cache operation to be used in Define Extend (DE).
2776  */
2777 static int
2778 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
2779 {
2780         struct dasd_eckd_private *private =
2781                 (struct dasd_eckd_private *)device->private;
2782         struct attrib_data_t attrib;
2783
2784         if (!capable(CAP_SYS_ADMIN))
2785                 return -EACCES;
2786         if (!argp)
2787                 return -EINVAL;
2788
2789         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
2790                 return -EFAULT;
2791         private->attrib = attrib;
2792
2793         dev_info(&device->cdev->dev,
2794                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
2795                  private->attrib.operation, private->attrib.nr_cyl);
2796         return 0;
2797 }
2798
2799 /*
2800  * Issue syscall I/O to EMC Symmetrix array.
2801  * CCWs are PSF and RSSD
2802  */
2803 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
2804 {
2805         struct dasd_symmio_parms usrparm;
2806         char *psf_data, *rssd_result;
2807         struct dasd_ccw_req *cqr;
2808         struct ccw1 *ccw;
2809         int rc;
2810
2811         /* Copy parms from caller */
2812         rc = -EFAULT;
2813         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
2814                 goto out;
2815 #ifndef CONFIG_64BIT
2816         /* Make sure pointers are sane even on 31 bit. */
2817         if ((usrparm.psf_data >> 32) != 0 || (usrparm.rssd_result >> 32) != 0) {
2818                 rc = -EINVAL;
2819                 goto out;
2820         }
2821 #endif
2822         /* alloc I/O data area */
2823         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
2824         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
2825         if (!psf_data || !rssd_result) {
2826                 rc = -ENOMEM;
2827                 goto out_free;
2828         }
2829
2830         /* get syscall header from user space */
2831         rc = -EFAULT;
2832         if (copy_from_user(psf_data,
2833                            (void __user *)(unsigned long) usrparm.psf_data,
2834                            usrparm.psf_data_len))
2835                 goto out_free;
2836
2837         /* sanity check on syscall header */
2838         if (psf_data[0] != 0x17 && psf_data[1] != 0xce) {
2839                 rc = -EINVAL;
2840                 goto out_free;
2841         }
2842
2843         /* setup CCWs for PSF + RSSD */
2844         cqr = dasd_smalloc_request("ECKD", 2 , 0, device);
2845         if (IS_ERR(cqr)) {
2846                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2847                         "Could not allocate initialization request");
2848                 rc = PTR_ERR(cqr);
2849                 goto out_free;
2850         }
2851
2852         cqr->startdev = device;
2853         cqr->memdev = device;
2854         cqr->retries = 3;
2855         cqr->expires = 10 * HZ;
2856         cqr->buildclk = get_clock();
2857         cqr->status = DASD_CQR_FILLED;
2858
2859         /* Build the ccws */
2860         ccw = cqr->cpaddr;
2861
2862         /* PSF ccw */
2863         ccw->cmd_code = DASD_ECKD_CCW_PSF;
2864         ccw->count = usrparm.psf_data_len;
2865         ccw->flags |= CCW_FLAG_CC;
2866         ccw->cda = (__u32)(addr_t) psf_data;
2867
2868         ccw++;
2869
2870         /* RSSD ccw  */
2871         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
2872         ccw->count = usrparm.rssd_result_len;
2873         ccw->flags = CCW_FLAG_SLI ;
2874         ccw->cda = (__u32)(addr_t) rssd_result;
2875
2876         rc = dasd_sleep_on(cqr);
2877         if (rc)
2878                 goto out_sfree;
2879
2880         rc = -EFAULT;
2881         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
2882                            rssd_result, usrparm.rssd_result_len))
2883                 goto out_sfree;
2884         rc = 0;
2885
2886 out_sfree:
2887         dasd_sfree_request(cqr, cqr->memdev);
2888 out_free:
2889         kfree(rssd_result);
2890         kfree(psf_data);
2891 out:
2892         DBF_DEV_EVENT(DBF_WARNING, device, "Symmetrix ioctl: rc=%d", rc);
2893         return rc;
2894 }
2895
2896 static int
2897 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
2898 {
2899         struct dasd_device *device = block->base;
2900
2901         switch (cmd) {
2902         case BIODASDGATTR:
2903                 return dasd_eckd_get_attrib(device, argp);
2904         case BIODASDSATTR:
2905                 return dasd_eckd_set_attrib(device, argp);
2906         case BIODASDPSRD:
2907                 return dasd_eckd_performance(device, argp);
2908         case BIODASDRLSE:
2909                 return dasd_eckd_release(device);
2910         case BIODASDRSRV:
2911                 return dasd_eckd_reserve(device);
2912         case BIODASDSLCK:
2913                 return dasd_eckd_steal_lock(device);
2914         case BIODASDSYMMIO:
2915                 return dasd_symm_io(device, argp);
2916         default:
2917                 return -ENOIOCTLCMD;
2918         }
2919 }
2920
2921 /*
2922  * Dump the range of CCWs into 'page' buffer
2923  * and return number of printed chars.
2924  */
2925 static int
2926 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
2927 {
2928         int len, count;
2929         char *datap;
2930
2931         len = 0;
2932         while (from <= to) {
2933                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2934                                " CCW %p: %08X %08X DAT:",
2935                                from, ((int *) from)[0], ((int *) from)[1]);
2936
2937                 /* get pointer to data (consider IDALs) */
2938                 if (from->flags & CCW_FLAG_IDA)
2939                         datap = (char *) *((addr_t *) (addr_t) from->cda);
2940                 else
2941                         datap = (char *) ((addr_t) from->cda);
2942
2943                 /* dump data (max 32 bytes) */
2944                 for (count = 0; count < from->count && count < 32; count++) {
2945                         if (count % 8 == 0) len += sprintf(page + len, " ");
2946                         if (count % 4 == 0) len += sprintf(page + len, " ");
2947                         len += sprintf(page + len, "%02x", datap[count]);
2948                 }
2949                 len += sprintf(page + len, "\n");
2950                 from++;
2951         }
2952         return len;
2953 }
2954
2955 static void
2956 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct dasd_ccw_req *req,
2957                          struct irb *irb, char *reason)
2958 {
2959         u64 *sense;
2960         int sl;
2961         struct tsb *tsb;
2962
2963         sense = NULL;
2964         tsb = NULL;
2965         if (req && scsw_is_tm(&req->irb.scsw)) {
2966                 if (irb->scsw.tm.tcw)
2967                         tsb = tcw_get_tsb(
2968                                 (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
2969                 if (tsb && (irb->scsw.tm.fcxs == 0x01)) {
2970                         switch (tsb->flags & 0x07) {
2971                         case 1: /* tsa_iostat */
2972                                 sense = (u64 *)tsb->tsa.iostat.sense;
2973                         break;
2974                         case 2: /* ts_ddpc */
2975                                 sense = (u64 *)tsb->tsa.ddpc.sense;
2976                         break;
2977                         case 3: /* tsa_intrg */
2978                         break;
2979                         }
2980                 }
2981         } else {
2982                 if (irb->esw.esw0.erw.cons)
2983                         sense = (u64 *)irb->ecw;
2984         }
2985         if (sense) {
2986                 for (sl = 0; sl < 4; sl++) {
2987                         DBF_DEV_EVENT(DBF_EMERG, device,
2988                                       "%s: %016llx %016llx %016llx %016llx",
2989                                       reason, sense[0], sense[1], sense[2],
2990                                       sense[3]);
2991                 }
2992         } else {
2993                 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
2994                               "SORRY - NO VALID SENSE AVAILABLE\n");
2995         }
2996 }
2997
2998 /*
2999  * Print sense data and related channel program.
3000  * Parts are printed because printk buffer is only 1024 bytes.
3001  */
3002 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
3003                                  struct dasd_ccw_req *req, struct irb *irb)
3004 {
3005         char *page;
3006         struct ccw1 *first, *last, *fail, *from, *to;
3007         int len, sl, sct;
3008
3009         page = (char *) get_zeroed_page(GFP_ATOMIC);
3010         if (page == NULL) {
3011                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3012                               "No memory to dump sense data\n");
3013                 return;
3014         }
3015         /* dump the sense data */
3016         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3017                       " I/O status report for device %s:\n",
3018                       dev_name(&device->cdev->dev));
3019         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3020                        " in req: %p CS: 0x%02X DS: 0x%02X CC: 0x%02X RC: %d\n",
3021                        req, scsw_cstat(&irb->scsw), scsw_dstat(&irb->scsw),
3022                        scsw_cc(&irb->scsw), req->intrc);
3023         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3024                        " device %s: Failing CCW: %p\n",
3025                        dev_name(&device->cdev->dev),
3026                        (void *) (addr_t) irb->scsw.cmd.cpa);
3027         if (irb->esw.esw0.erw.cons) {
3028                 for (sl = 0; sl < 4; sl++) {
3029                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3030                                        " Sense(hex) %2d-%2d:",
3031                                        (8 * sl), ((8 * sl) + 7));
3032
3033                         for (sct = 0; sct < 8; sct++) {
3034                                 len += sprintf(page + len, " %02x",
3035                                                irb->ecw[8 * sl + sct]);
3036                         }
3037                         len += sprintf(page + len, "\n");
3038                 }
3039
3040                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
3041                         /* 24 Byte Sense Data */
3042                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3043                                 " 24 Byte: %x MSG %x, "
3044                                 "%s MSGb to SYSOP\n",
3045                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
3046                                 irb->ecw[1] & 0x10 ? "" : "no");
3047                 } else {
3048                         /* 32 Byte Sense Data */
3049                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3050                                 " 32 Byte: Format: %x "
3051                                 "Exception class %x\n",
3052                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
3053                 }
3054         } else {
3055                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3056                         " SORRY - NO VALID SENSE AVAILABLE\n");
3057         }
3058         printk("%s", page);
3059
3060         if (req) {
3061                 /* req == NULL for unsolicited interrupts */
3062                 /* dump the Channel Program (max 140 Bytes per line) */
3063                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
3064                 first = req->cpaddr;
3065                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
3066                 to = min(first + 6, last);
3067                 len = sprintf(page,  KERN_ERR PRINTK_HEADER
3068                               " Related CP in req: %p\n", req);
3069                 dasd_eckd_dump_ccw_range(first, to, page + len);
3070                 printk("%s", page);
3071
3072                 /* print failing CCW area (maximum 4) */
3073                 /* scsw->cda is either valid or zero  */
3074                 len = 0;
3075                 from = ++to;
3076                 fail = (struct ccw1 *)(addr_t)
3077                                 irb->scsw.cmd.cpa; /* failing CCW */
3078                 if (from <  fail - 2) {
3079                         from = fail - 2;     /* there is a gap - print header */
3080                         len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
3081                 }
3082                 to = min(fail + 1, last);
3083                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
3084
3085                 /* print last CCWs (maximum 2) */
3086                 from = max(from, ++to);
3087                 if (from < last - 1) {
3088                         from = last - 1;     /* there is a gap - print header */
3089                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
3090                 }
3091                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
3092                 if (len > 0)
3093                         printk("%s", page);
3094         }
3095         free_page((unsigned long) page);
3096 }
3097
3098
3099 /*
3100  * Print sense data from a tcw.
3101  */
3102 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
3103                                  struct dasd_ccw_req *req, struct irb *irb)
3104 {
3105         char *page;
3106         int len, sl, sct, residual;
3107
3108         struct tsb *tsb;
3109         u8 *sense;
3110
3111
3112         page = (char *) get_zeroed_page(GFP_ATOMIC);
3113         if (page == NULL) {
3114                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
3115                             "No memory to dump sense data");
3116                 return;
3117         }
3118         /* dump the sense data */
3119         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3120                       " I/O status report for device %s:\n",
3121                       dev_name(&device->cdev->dev));
3122         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3123                        " in req: %p CS: 0x%02X DS: 0x%02X CC: 0x%02X RC: %d "
3124                        "fcxs: 0x%02X schxs: 0x%02X\n", req,
3125                        scsw_cstat(&irb->scsw), scsw_dstat(&irb->scsw),
3126                        scsw_cc(&irb->scsw), req->intrc,
3127                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs);
3128         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3129                        " device %s: Failing TCW: %p\n",
3130                        dev_name(&device->cdev->dev),
3131                        (void *) (addr_t) irb->scsw.tm.tcw);
3132
3133         tsb = NULL;
3134         sense = NULL;
3135         if (irb->scsw.tm.tcw)
3136                 tsb = tcw_get_tsb(
3137                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
3138
3139         if (tsb && (irb->scsw.tm.fcxs == 0x01)) {
3140                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3141                                " tsb->length %d\n", tsb->length);
3142                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3143                                " tsb->flags %x\n", tsb->flags);
3144                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3145                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
3146                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3147                                " tsb->count %d\n", tsb->count);
3148                 residual = tsb->count - 28;
3149                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3150                                " residual %d\n", residual);
3151
3152                 switch (tsb->flags & 0x07) {
3153                 case 1: /* tsa_iostat */
3154                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3155                                " tsb->tsa.iostat.dev_time %d\n",
3156                                        tsb->tsa.iostat.dev_time);
3157                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3158                                " tsb->tsa.iostat.def_time %d\n",
3159                                        tsb->tsa.iostat.def_time);
3160                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3161                                " tsb->tsa.iostat.queue_time %d\n",
3162                                        tsb->tsa.iostat.queue_time);
3163                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3164                                " tsb->tsa.iostat.dev_busy_time %d\n",
3165                                        tsb->tsa.iostat.dev_busy_time);
3166                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3167                                " tsb->tsa.iostat.dev_act_time %d\n",
3168                                        tsb->tsa.iostat.dev_act_time);
3169                         sense = tsb->tsa.iostat.sense;
3170                         break;
3171                 case 2: /* ts_ddpc */
3172                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3173                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
3174                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3175                                " tsb->tsa.ddpc.rcq:  ");
3176                         for (sl = 0; sl < 16; sl++) {
3177                                 for (sct = 0; sct < 8; sct++) {
3178                                         len += sprintf(page + len, " %02x",
3179                                                        tsb->tsa.ddpc.rcq[sl]);
3180                                 }
3181                                 len += sprintf(page + len, "\n");
3182                         }
3183                         sense = tsb->tsa.ddpc.sense;
3184                         break;
3185                 case 3: /* tsa_intrg */
3186                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3187                                       " tsb->tsa.intrg.: not supportet yet \n");
3188                         break;
3189                 }
3190
3191                 if (sense) {
3192                         for (sl = 0; sl < 4; sl++) {
3193                                 len += sprintf(page + len,
3194                                                KERN_ERR PRINTK_HEADER
3195                                                " Sense(hex) %2d-%2d:",
3196                                                (8 * sl), ((8 * sl) + 7));
3197                                 for (sct = 0; sct < 8; sct++) {
3198                                         len += sprintf(page + len, " %02x",
3199                                                        sense[8 * sl + sct]);
3200                                 }
3201                                 len += sprintf(page + len, "\n");
3202                         }
3203
3204                         if (sense[27] & DASD_SENSE_BIT_0) {
3205                                 /* 24 Byte Sense Data */
3206                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3207                                         " 24 Byte: %x MSG %x, "
3208                                         "%s MSGb to SYSOP\n",
3209                                         sense[7] >> 4, sense[7] & 0x0f,
3210                                         sense[1] & 0x10 ? "" : "no");
3211                         } else {
3212                                 /* 32 Byte Sense Data */
3213                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3214                                         " 32 Byte: Format: %x "
3215                                         "Exception class %x\n",
3216                                         sense[6] & 0x0f, sense[22] >> 4);
3217                         }
3218                 } else {
3219                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3220                                 " SORRY - NO VALID SENSE AVAILABLE\n");
3221                 }
3222         } else {
3223                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3224                         " SORRY - NO TSB DATA AVAILABLE\n");
3225         }
3226         printk("%s", page);
3227         free_page((unsigned long) page);
3228 }
3229
3230 static void dasd_eckd_dump_sense(struct dasd_device *device,
3231                                  struct dasd_ccw_req *req, struct irb *irb)
3232 {
3233         if (req && scsw_is_tm(&req->irb.scsw))
3234                 dasd_eckd_dump_sense_tcw(device, req, irb);
3235         else
3236                 dasd_eckd_dump_sense_ccw(device, req, irb);
3237 }
3238
3239
3240 /*
3241  * max_blocks is dependent on the amount of storage that is available
3242  * in the static io buffer for each device. Currently each device has
3243  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
3244  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
3245  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
3246  * addition we have one define extent ccw + 16 bytes of data and one
3247  * locate record ccw + 16 bytes of data. That makes:
3248  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
3249  * We want to fit two into the available memory so that we can immediately
3250  * start the next request if one finishes off. That makes 249.5 blocks
3251  * for one request. Give a little safety and the result is 240.
3252  */
3253 static struct dasd_discipline dasd_eckd_discipline = {
3254         .owner = THIS_MODULE,
3255         .name = "ECKD",
3256         .ebcname = "ECKD",
3257         .max_blocks = 240,
3258         .check_device = dasd_eckd_check_characteristics,
3259         .uncheck_device = dasd_eckd_uncheck_device,
3260         .do_analysis = dasd_eckd_do_analysis,
3261         .ready_to_online = dasd_eckd_ready_to_online,
3262         .online_to_ready = dasd_eckd_online_to_ready,
3263         .fill_geometry = dasd_eckd_fill_geometry,
3264         .start_IO = dasd_start_IO,
3265         .term_IO = dasd_term_IO,
3266         .handle_terminated_request = dasd_eckd_handle_terminated_request,
3267         .format_device = dasd_eckd_format_device,
3268         .erp_action = dasd_eckd_erp_action,
3269         .erp_postaction = dasd_eckd_erp_postaction,
3270         .handle_unsolicited_interrupt = dasd_eckd_handle_unsolicited_interrupt,
3271         .build_cp = dasd_eckd_build_alias_cp,
3272         .free_cp = dasd_eckd_free_alias_cp,
3273         .dump_sense = dasd_eckd_dump_sense,
3274         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
3275         .fill_info = dasd_eckd_fill_info,
3276         .ioctl = dasd_eckd_ioctl,
3277 };
3278
3279 static int __init
3280 dasd_eckd_init(void)
3281 {
3282         int ret;
3283
3284         ASCEBC(dasd_eckd_discipline.ebcname, 4);
3285         ret = ccw_driver_register(&dasd_eckd_driver);
3286         if (!ret)
3287                 wait_for_device_probe();
3288
3289         return ret;
3290 }
3291
3292 static void __exit
3293 dasd_eckd_cleanup(void)
3294 {
3295         ccw_driver_unregister(&dasd_eckd_driver);
3296 }
3297
3298 module_init(dasd_eckd_init);
3299 module_exit(dasd_eckd_cleanup);