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   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 #include <linux/stddef.h>
  15 #include <linux/kernel.h>
  16 #include <linux/slab.h>
  17 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  18 #include <linux/bio.h>
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21
  22 #include <asm/debug.h>
  23 #include <asm/idals.h>
  24 #include <asm/ebcdic.h>
  25 #include <asm/io.h>
  26 #include <asm/todclk.h>
  27 #include <asm/uaccess.h>
  28 #include <asm/cio.h>
  29 #include <asm/ccwdev.h>
  30
  31 #include "dasd_int.h"
  32 #include "dasd_eckd.h"
  33
  34 #ifdef PRINTK_HEADER
  35 #undef PRINTK_HEADER
  36 #endif                          /* PRINTK_HEADER */
  37 #define PRINTK_HEADER "dasd(eckd):"
  38
  39 #define ECKD_C0(i) (i->home_bytes)
  40 #define ECKD_F(i) (i->formula)
  41 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
  42                     (i->factors.f_0x02.f1))
  43 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
  44                     (i->factors.f_0x02.f2))
  45 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
  46                     (i->factors.f_0x02.f3))
  47 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
  48 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
  49 #define ECKD_F6(i) (i->factor6)
  50 #define ECKD_F7(i) (i->factor7)
  51 #define ECKD_F8(i) (i->factor8)
  52
  53 MODULE_LICENSE("GPL");
  54
  55 static struct dasd_discipline dasd_eckd_discipline;
  56
  57 /* The ccw bus type uses this table to find devices that it sends to
  58  * dasd_eckd_probe */
  59 static struct ccw_device_id dasd_eckd_ids[] = {
  60         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
  61         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
  62         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3390, 0), .driver_info = 0x3},
  63         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
  64         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
  65         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
  66         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
  67         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
  68         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
  69         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
  70         { /* end of list */ },
  71 };
  72
  73 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  74
  75 static struct ccw_driver dasd_eckd_driver; /* see below */
  76
  77 /* initial attempt at a probe function. this can be simplified once
  78  * the other detection code is gone */
  79 static int
  80 dasd_eckd_probe (struct ccw_device *cdev)
  81 {
  82         int ret;
  83
  84         /* set ECKD specific ccw-device options */
  85         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE);
  86         if (ret) {
  87                 printk(KERN_WARNING
  88                        "dasd_eckd_probe: could not set ccw-device options "
  89                        "for %s\n", dev_name(&cdev->dev));
  90                 return ret;
  91         }
  92         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
  93         return ret;
  94 }
  95
  96 static int
  97 dasd_eckd_set_online(struct ccw_device *cdev)
  98 {
  99         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
 100 }
 101
 102 static struct ccw_driver dasd_eckd_driver = {
 103         .name        = "dasd-eckd",
 104         .owner       = THIS_MODULE,
 105         .ids         = dasd_eckd_ids,
 106         .probe       = dasd_eckd_probe,
 107         .remove      = dasd_generic_remove,
 108         .set_offline = dasd_generic_set_offline,
 109         .set_online  = dasd_eckd_set_online,
 110         .notify      = dasd_generic_notify,
 111 };
 112
 113 static const int sizes_trk0[] = { 28, 148, 84 };
 114 #define LABEL_SIZE 140
 115
 116 static inline unsigned int
 117 round_up_multiple(unsigned int no, unsigned int mult)
 118 {
 119         int rem = no % mult;
 120         return (rem ? no - rem + mult : no);
 121 }
 122
 123 static inline unsigned int
 124 ceil_quot(unsigned int d1, unsigned int d2)
 125 {
 126         return (d1 + (d2 - 1)) / d2;
 127 }
 128
 129 static unsigned int
 130 recs_per_track(struct dasd_eckd_characteristics * rdc,
 131                unsigned int kl, unsigned int dl)
 132 {
 133         int dn, kn;
 134
 135         switch (rdc->dev_type) {
 136         case 0x3380:
 137                 if (kl)
 138                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 139                                        ceil_quot(dl + 12, 32));
 140                 else
 141                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 142         case 0x3390:
 143                 dn = ceil_quot(dl + 6, 232) + 1;
 144                 if (kl) {
 145                         kn = ceil_quot(kl + 6, 232) + 1;
 146                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 147                                        9 + ceil_quot(dl + 6 * dn, 34));
 148                 } else
 149                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 150         case 0x9345:
 151                 dn = ceil_quot(dl + 6, 232) + 1;
 152                 if (kl) {
 153                         kn = ceil_quot(kl + 6, 232) + 1;
 154                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 155                                        ceil_quot(dl + 6 * dn, 34));
 156                 } else
 157                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 158         }
 159         return 0;
 160 }
 161
 162 static int
 163 check_XRC (struct ccw1         *de_ccw,
 164            struct DE_eckd_data *data,
 165            struct dasd_device  *device)
 166 {
 167         struct dasd_eckd_private *private;
 168         int rc;
 169
 170         private = (struct dasd_eckd_private *) device->private;
 171         if (!private->rdc_data.facilities.XRC_supported)
 172                 return 0;
 173
 174         /* switch on System Time Stamp - needed for XRC Support */
 175         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 176         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 177
 178         rc = get_sync_clock(&data->ep_sys_time);
 179         /* Ignore return code if sync clock is switched off. */
 180         if (rc == -ENOSYS || rc == -EACCES)
 181                 rc = 0;
 182
 183         de_ccw->count = sizeof(struct DE_eckd_data);
 184         de_ccw->flags |= CCW_FLAG_SLI;
 185         return rc;
 186 }
 187
 188 static int
 189 define_extent(struct ccw1 * ccw, struct DE_eckd_data * data, int trk,
 190               int totrk, int cmd, struct dasd_device * device)
 191 {
 192         struct dasd_eckd_private *private;
 193         struct ch_t geo, beg, end;
 194         int rc = 0;
 195
 196         private = (struct dasd_eckd_private *) device->private;
 197
 198         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 199         ccw->flags = 0;
 200         ccw->count = 16;
 201         ccw->cda = (__u32) __pa(data);
 202
 203         memset(data, 0, sizeof(struct DE_eckd_data));
 204         switch (cmd) {
 205         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 206         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 207         case DASD_ECKD_CCW_READ:
 208         case DASD_ECKD_CCW_READ_MT:
 209         case DASD_ECKD_CCW_READ_CKD:
 210         case DASD_ECKD_CCW_READ_CKD_MT:
 211         case DASD_ECKD_CCW_READ_KD:
 212         case DASD_ECKD_CCW_READ_KD_MT:
 213         case DASD_ECKD_CCW_READ_COUNT:
 214                 data->mask.perm = 0x1;
 215                 data->attributes.operation = private->attrib.operation;
 216                 break;
 217         case DASD_ECKD_CCW_WRITE:
 218         case DASD_ECKD_CCW_WRITE_MT:
 219         case DASD_ECKD_CCW_WRITE_KD:
 220         case DASD_ECKD_CCW_WRITE_KD_MT:
 221                 data->mask.perm = 0x02;
 222                 data->attributes.operation = private->attrib.operation;
 223                 rc = check_XRC (ccw, data, device);
 224                 break;
 225         case DASD_ECKD_CCW_WRITE_CKD:
 226         case DASD_ECKD_CCW_WRITE_CKD_MT:
 227                 data->attributes.operation = DASD_BYPASS_CACHE;
 228                 rc = check_XRC (ccw, data, device);
 229                 break;
 230         case DASD_ECKD_CCW_ERASE:
 231         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 232         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 233                 data->mask.perm = 0x3;
 234                 data->mask.auth = 0x1;
 235                 data->attributes.operation = DASD_BYPASS_CACHE;
 236                 rc = check_XRC (ccw, data, device);
 237                 break;
 238         default:
 239                 DEV_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", cmd);
 240                 break;
 241         }
 242
 243         data->attributes.mode = 0x3;    /* ECKD */
 244
 245         if ((private->rdc_data.cu_type == 0x2105 ||
 246              private->rdc_data.cu_type == 0x2107 ||
 247              private->rdc_data.cu_type == 0x1750)
 248             && !(private->uses_cdl && trk < 2))
 249                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 250
 251         geo.cyl = private->rdc_data.no_cyl;
 252         geo.head = private->rdc_data.trk_per_cyl;
 253         beg.cyl = trk / geo.head;
 254         beg.head = trk % geo.head;
 255         end.cyl = totrk / geo.head;
 256         end.head = totrk % geo.head;
 257
 258         /* check for sequential prestage - enhance cylinder range */
 259         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 260             data->attributes.operation == DASD_SEQ_ACCESS) {
 261
 262                 if (end.cyl + private->attrib.nr_cyl < geo.cyl)
 263                         end.cyl += private->attrib.nr_cyl;
 264                 else
 265                         end.cyl = (geo.cyl - 1);
 266         }
 267
 268         data->beg_ext.cyl = beg.cyl;
 269         data->beg_ext.head = beg.head;
 270         data->end_ext.cyl = end.cyl;
 271         data->end_ext.head = end.head;
 272         return rc;
 273 }
 274
 275 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
 276                                struct dasd_device  *device)
 277 {
 278         struct dasd_eckd_private *private;
 279         int rc;
 280
 281         private = (struct dasd_eckd_private *) device->private;
 282         if (!private->rdc_data.facilities.XRC_supported)
 283                 return 0;
 284
 285         /* switch on System Time Stamp - needed for XRC Support */
 286         pfxdata->define_extend.ga_extended |= 0x08; /* 'Time Stamp Valid'   */
 287         pfxdata->define_extend.ga_extended |= 0x02; /* 'Extended Parameter' */
 288         pfxdata->validity.time_stamp = 1;           /* 'Time Stamp Valid'   */
 289
 290         rc = get_sync_clock(&pfxdata->define_extend.ep_sys_time);
 291         /* Ignore return code if sync clock is switched off. */
 292         if (rc == -ENOSYS || rc == -EACCES)
 293                 rc = 0;
 294         return rc;
 295 }
 296
 297 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata, int trk,
 298                   int totrk, int cmd, struct dasd_device *basedev,
 299                   struct dasd_device *startdev)
 300 {
 301         struct dasd_eckd_private *basepriv, *startpriv;
 302         struct DE_eckd_data *data;
 303         struct ch_t geo, beg, end;
 304         int rc = 0;
 305
 306         basepriv = (struct dasd_eckd_private *) basedev->private;
 307         startpriv = (struct dasd_eckd_private *) startdev->private;
 308         data = &pfxdata->define_extend;
 309
 310         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 311         ccw->flags = 0;
 312         ccw->count = sizeof(*pfxdata);
 313         ccw->cda = (__u32) __pa(pfxdata);
 314
 315         memset(pfxdata, 0, sizeof(*pfxdata));
 316         /* prefix data */
 317         pfxdata->format = 0;
 318         pfxdata->base_address = basepriv->ned->unit_addr;
 319         pfxdata->base_lss = basepriv->ned->ID;
 320         pfxdata->validity.define_extend = 1;
 321
 322         /* private uid is kept up to date, conf_data may be outdated */
 323         if (startpriv->uid.type != UA_BASE_DEVICE) {
 324                 pfxdata->validity.verify_base = 1;
 325                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
 326                         pfxdata->validity.hyper_pav = 1;
 327         }
 328
 329         /* define extend data (mostly)*/
 330         switch (cmd) {
 331         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 332         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 333         case DASD_ECKD_CCW_READ:
 334         case DASD_ECKD_CCW_READ_MT:
 335         case DASD_ECKD_CCW_READ_CKD:
 336         case DASD_ECKD_CCW_READ_CKD_MT:
 337         case DASD_ECKD_CCW_READ_KD:
 338         case DASD_ECKD_CCW_READ_KD_MT:
 339         case DASD_ECKD_CCW_READ_COUNT:
 340                 data->mask.perm = 0x1;
 341                 data->attributes.operation = basepriv->attrib.operation;
 342                 break;
 343         case DASD_ECKD_CCW_WRITE:
 344         case DASD_ECKD_CCW_WRITE_MT:
 345         case DASD_ECKD_CCW_WRITE_KD:
 346         case DASD_ECKD_CCW_WRITE_KD_MT:
 347                 data->mask.perm = 0x02;
 348                 data->attributes.operation = basepriv->attrib.operation;
 349                 rc = check_XRC_on_prefix(pfxdata, basedev);
 350                 break;
 351         case DASD_ECKD_CCW_WRITE_CKD:
 352         case DASD_ECKD_CCW_WRITE_CKD_MT:
 353                 data->attributes.operation = DASD_BYPASS_CACHE;
 354                 rc = check_XRC_on_prefix(pfxdata, basedev);
 355                 break;
 356         case DASD_ECKD_CCW_ERASE:
 357         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 358         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 359                 data->mask.perm = 0x3;
 360                 data->mask.auth = 0x1;
 361                 data->attributes.operation = DASD_BYPASS_CACHE;
 362                 rc = check_XRC_on_prefix(pfxdata, basedev);
 363                 break;
 364         default:
 365                 DEV_MESSAGE(KERN_ERR, basedev, "unknown opcode 0x%x", cmd);
 366                 break;
 367         }
 368
 369         data->attributes.mode = 0x3;    /* ECKD */
 370
 371         if ((basepriv->rdc_data.cu_type == 0x2105 ||
 372              basepriv->rdc_data.cu_type == 0x2107 ||
 373              basepriv->rdc_data.cu_type == 0x1750)
 374             && !(basepriv->uses_cdl && trk < 2))
 375                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 376
 377         geo.cyl = basepriv->rdc_data.no_cyl;
 378         geo.head = basepriv->rdc_data.trk_per_cyl;
 379         beg.cyl = trk / geo.head;
 380         beg.head = trk % geo.head;
 381         end.cyl = totrk / geo.head;
 382         end.head = totrk % geo.head;
 383
 384         /* check for sequential prestage - enhance cylinder range */
 385         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 386             data->attributes.operation == DASD_SEQ_ACCESS) {
 387
 388                 if (end.cyl + basepriv->attrib.nr_cyl < geo.cyl)
 389                         end.cyl += basepriv->attrib.nr_cyl;
 390                 else
 391                         end.cyl = (geo.cyl - 1);
 392         }
 393
 394         data->beg_ext.cyl = beg.cyl;
 395         data->beg_ext.head = beg.head;
 396         data->end_ext.cyl = end.cyl;
 397         data->end_ext.head = end.head;
 398         return rc;
 399 }
 400
 401 static void
 402 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, int trk,
 403               int rec_on_trk, int no_rec, int cmd,
 404               struct dasd_device * device, int reclen)
 405 {
 406         struct dasd_eckd_private *private;
 407         int sector;
 408         int dn, d;
 409
 410         private = (struct dasd_eckd_private *) device->private;
 411
 412         DBF_DEV_EVENT(DBF_INFO, device,
 413                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 414                   trk, rec_on_trk, no_rec, cmd, reclen);
 415
 416         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 417         ccw->flags = 0;
 418         ccw->count = 16;
 419         ccw->cda = (__u32) __pa(data);
 420
 421         memset(data, 0, sizeof(struct LO_eckd_data));
 422         sector = 0;
 423         if (rec_on_trk) {
 424                 switch (private->rdc_data.dev_type) {
 425                 case 0x3390:
 426                         dn = ceil_quot(reclen + 6, 232);
 427                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 428                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 429                         break;
 430                 case 0x3380:
 431                         d = 7 + ceil_quot(reclen + 12, 32);
 432                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 433                         break;
 434                 }
 435         }
 436         data->sector = sector;
 437         data->count = no_rec;
 438         switch (cmd) {
 439         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 440                 data->operation.orientation = 0x3;
 441                 data->operation.operation = 0x03;
 442                 break;
 443         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 444                 data->operation.orientation = 0x3;
 445                 data->operation.operation = 0x16;
 446                 break;
 447         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 448                 data->operation.orientation = 0x1;
 449                 data->operation.operation = 0x03;
 450                 data->count++;
 451                 break;
 452         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 453                 data->operation.orientation = 0x3;
 454                 data->operation.operation = 0x16;
 455                 data->count++;
 456                 break;
 457         case DASD_ECKD_CCW_WRITE:
 458         case DASD_ECKD_CCW_WRITE_MT:
 459         case DASD_ECKD_CCW_WRITE_KD:
 460         case DASD_ECKD_CCW_WRITE_KD_MT:
 461                 data->auxiliary.last_bytes_used = 0x1;
 462                 data->length = reclen;
 463                 data->operation.operation = 0x01;
 464                 break;
 465         case DASD_ECKD_CCW_WRITE_CKD:
 466         case DASD_ECKD_CCW_WRITE_CKD_MT:
 467                 data->auxiliary.last_bytes_used = 0x1;
 468                 data->length = reclen;
 469                 data->operation.operation = 0x03;
 470                 break;
 471         case DASD_ECKD_CCW_READ:
 472         case DASD_ECKD_CCW_READ_MT:
 473         case DASD_ECKD_CCW_READ_KD:
 474         case DASD_ECKD_CCW_READ_KD_MT:
 475                 data->auxiliary.last_bytes_used = 0x1;
 476                 data->length = reclen;
 477                 data->operation.operation = 0x06;
 478                 break;
 479         case DASD_ECKD_CCW_READ_CKD:
 480         case DASD_ECKD_CCW_READ_CKD_MT:
 481                 data->auxiliary.last_bytes_used = 0x1;
 482                 data->length = reclen;
 483                 data->operation.operation = 0x16;
 484                 break;
 485         case DASD_ECKD_CCW_READ_COUNT:
 486                 data->operation.operation = 0x06;
 487                 break;
 488         case DASD_ECKD_CCW_ERASE:
 489                 data->length = reclen;
 490                 data->auxiliary.last_bytes_used = 0x1;
 491                 data->operation.operation = 0x0b;
 492                 break;
 493         default:
 494                 DEV_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", cmd);
 495         }
 496         data->seek_addr.cyl = data->search_arg.cyl =
 497                 trk / private->rdc_data.trk_per_cyl;
 498         data->seek_addr.head = data->search_arg.head =
 499                 trk % private->rdc_data.trk_per_cyl;
 500         data->search_arg.record = rec_on_trk;
 501 }
 502
 503 /*
 504  * Returns 1 if the block is one of the special blocks that needs
 505  * to get read/written with the KD variant of the command.
 506  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 507  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 508  * Luckily the KD variants differ only by one bit (0x08) from the
 509  * normal variant. So don't wonder about code like:
 510  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 511  *         ccw->cmd_code |= 0x8;
 512  */
 513 static inline int
 514 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 515 {
 516         if (recid < 3)
 517                 return 1;
 518         if (recid < blk_per_trk)
 519                 return 0;
 520         if (recid < 2 * blk_per_trk)
 521                 return 1;
 522         return 0;
 523 }
 524
 525 /*
 526  * Returns the record size for the special blocks of the cdl format.
 527  * Only returns something useful if dasd_eckd_cdl_special is true
 528  * for the recid.
 529  */
 530 static inline int
 531 dasd_eckd_cdl_reclen(int recid)
 532 {
 533         if (recid < 3)
 534                 return sizes_trk0[recid];
 535         return LABEL_SIZE;
 536 }
 537
 538 /*
 539  * Generate device unique id that specifies the physical device.
 540  */
 541 static int dasd_eckd_generate_uid(struct dasd_device *device,
 542                                   struct dasd_uid *uid)
 543 {
 544         struct dasd_eckd_private *private;
 545         int count;
 546
 547         private = (struct dasd_eckd_private *) device->private;
 548         if (!private)
 549                 return -ENODEV;
 550         if (!private->ned || !private->gneq)
 551                 return -ENODEV;
 552
 553         memset(uid, 0, sizeof(struct dasd_uid));
 554         memcpy(uid->vendor, private->ned->HDA_manufacturer,
 555                sizeof(uid->vendor) - 1);
 556         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 557         memcpy(uid->serial, private->ned->HDA_location,
 558                sizeof(uid->serial) - 1);
 559         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 560         uid->ssid = private->gneq->subsystemID;
 561         uid->real_unit_addr = private->ned->unit_addr;;
 562         if (private->sneq) {
 563                 uid->type = private->sneq->sua_flags;
 564                 if (uid->type == UA_BASE_PAV_ALIAS)
 565                         uid->base_unit_addr = private->sneq->base_unit_addr;
 566         } else {
 567                 uid->type = UA_BASE_DEVICE;
 568         }
 569         if (private->vdsneq) {
 570                 for (count = 0; count < 16; count++) {
 571                         sprintf(uid->vduit+2*count, "%02x",
 572                                 private->vdsneq->uit[count]);
 573                 }
 574         }
 575         return 0;
 576 }
 577
 578 static struct dasd_ccw_req *dasd_eckd_build_rcd_lpm(struct dasd_device *device,
 579                                                     void *rcd_buffer,
 580                                                     struct ciw *ciw, __u8 lpm)
 581 {
 582         struct dasd_ccw_req *cqr;
 583         struct ccw1 *ccw;
 584
 585         cqr = dasd_smalloc_request("ECKD", 1 /* RCD */, ciw->count, device);
 586
 587         if (IS_ERR(cqr)) {
 588                 DEV_MESSAGE(KERN_WARNING, device, "%s",
 589                             "Could not allocate RCD request");
 590                 return cqr;
 591         }
 592
 593         ccw = cqr->cpaddr;
 594         ccw->cmd_code = ciw->cmd;
 595         ccw->cda = (__u32)(addr_t)rcd_buffer;
 596         ccw->count = ciw->count;
 597
 598         cqr->startdev = device;
 599         cqr->memdev = device;
 600         cqr->block = NULL;
 601         cqr->expires = 10*HZ;
 602         cqr->lpm = lpm;
 603         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 604         cqr->retries = 2;
 605         cqr->buildclk = get_clock();
 606         cqr->status = DASD_CQR_FILLED;
 607         return cqr;
 608 }
 609
 610 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 611                                    void **rcd_buffer,
 612                                    int *rcd_buffer_size, __u8 lpm)
 613 {
 614         struct ciw *ciw;
 615         char *rcd_buf = NULL;
 616         int ret;
 617         struct dasd_ccw_req *cqr;
 618
 619         /*
 620          * scan for RCD command in extended SenseID data
 621          */
 622         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 623         if (!ciw || ciw->cmd == 0) {
 624                 ret = -EOPNOTSUPP;
 625                 goto out_error;
 626         }
 627         rcd_buf = kzalloc(ciw->count, GFP_KERNEL | GFP_DMA);
 628         if (!rcd_buf) {
 629                 ret = -ENOMEM;
 630                 goto out_error;
 631         }
 632
 633         /*
 634          * buffer has to start with EBCDIC "V1.0" to show
 635          * support for virtual device SNEQ
 636          */
 637         rcd_buf[0] = 0xE5;
 638         rcd_buf[1] = 0xF1;
 639         rcd_buf[2] = 0x4B;
 640         rcd_buf[3] = 0xF0;
 641         cqr = dasd_eckd_build_rcd_lpm(device, rcd_buf, ciw, lpm);
 642         if (IS_ERR(cqr)) {
 643                 ret =  PTR_ERR(cqr);
 644                 goto out_error;
 645         }
 646         ret = dasd_sleep_on(cqr);
 647         /*
 648          * on success we update the user input parms
 649          */
 650         dasd_sfree_request(cqr, cqr->memdev);
 651         if (ret)
 652                 goto out_error;
 653
 654         *rcd_buffer_size = ciw->count;
 655         *rcd_buffer = rcd_buf;
 656         return 0;
 657 out_error:
 658         kfree(rcd_buf);
 659         *rcd_buffer = NULL;
 660         *rcd_buffer_size = 0;
 661         return ret;
 662 }
 663
 664 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
 665 {
 666
 667         struct dasd_sneq *sneq;
 668         int i, count;
 669
 670         private->ned = NULL;
 671         private->sneq = NULL;
 672         private->vdsneq = NULL;
 673         private->gneq = NULL;
 674         count = private->conf_len / sizeof(struct dasd_sneq);
 675         sneq = (struct dasd_sneq *)private->conf_data;
 676         for (i = 0; i < count; ++i) {
 677                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 678                         private->sneq = sneq;
 679                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 680                         private->vdsneq = (struct vd_sneq *)sneq;
 681                 else if (sneq->flags.identifier == 2)
 682                         private->gneq = (struct dasd_gneq *)sneq;
 683                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 684                         private->ned = (struct dasd_ned *)sneq;
 685                 sneq++;
 686         }
 687         if (!private->ned || !private->gneq) {
 688                 private->ned = NULL;
 689                 private->sneq = NULL;
 690                 private->vdsneq = NULL;
 691                 private->gneq = NULL;
 692                 return -EINVAL;
 693         }
 694         return 0;
 695
 696 };
 697
 698 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
 699 {
 700         struct dasd_gneq *gneq;
 701         int i, count, found;
 702
 703         count = conf_len / sizeof(*gneq);
 704         gneq = (struct dasd_gneq *)conf_data;
 705         found = 0;
 706         for (i = 0; i < count; ++i) {
 707                 if (gneq->flags.identifier == 2) {
 708                         found = 1;
 709                         break;
 710                 }
 711                 gneq++;
 712         }
 713         if (found)
 714                 return ((char *)gneq)[18] & 0x07;
 715         else
 716                 return 0;
 717 }
 718
 719 static int dasd_eckd_read_conf(struct dasd_device *device)
 720 {
 721         void *conf_data;
 722         int conf_len, conf_data_saved;
 723         int rc;
 724         __u8 lpm;
 725         struct dasd_eckd_private *private;
 726         struct dasd_eckd_path *path_data;
 727
 728         private = (struct dasd_eckd_private *) device->private;
 729         path_data = (struct dasd_eckd_path *) &private->path_data;
 730         path_data->opm = ccw_device_get_path_mask(device->cdev);
 731         lpm = 0x80;
 732         conf_data_saved = 0;
 733         /* get configuration data per operational path */
 734         for (lpm = 0x80; lpm; lpm>>= 1) {
 735                 if (lpm & path_data->opm){
 736                         rc = dasd_eckd_read_conf_lpm(device, &conf_data,
 737                                                      &conf_len, lpm);
 738                         if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
 739                                 MESSAGE(KERN_WARNING,
 740                                         "Read configuration data returned "
 741                                         "error %d", rc);
 742                                 return rc;
 743                         }
 744                         if (conf_data == NULL) {
 745                                 MESSAGE(KERN_WARNING, "%s", "No configuration "
 746                                         "data retrieved");
 747                                 continue;       /* no error */
 748                         }
 749                         /* save first valid configuration data */
 750                         if (!conf_data_saved) {
 751                                 kfree(private->conf_data);
 752                                 private->conf_data = conf_data;
 753                                 private->conf_len = conf_len;
 754                                 if (dasd_eckd_identify_conf_parts(private)) {
 755                                         private->conf_data = NULL;
 756                                         private->conf_len = 0;
 757                                         kfree(conf_data);
 758                                         continue;
 759                                 }
 760                                 conf_data_saved++;
 761                         }
 762                         switch (dasd_eckd_path_access(conf_data, conf_len)) {
 763                         case 0x02:
 764                                 path_data->npm |= lpm;
 765                                 break;
 766                         case 0x03:
 767                                 path_data->ppm |= lpm;
 768                                 break;
 769                         }
 770                         if (conf_data != private->conf_data)
 771                                 kfree(conf_data);
 772                 }
 773         }
 774         return 0;
 775 }
 776
 777 static int dasd_eckd_read_features(struct dasd_device *device)
 778 {
 779         struct dasd_psf_prssd_data *prssdp;
 780         struct dasd_rssd_features *features;
 781         struct dasd_ccw_req *cqr;
 782         struct ccw1 *ccw;
 783         int rc;
 784         struct dasd_eckd_private *private;
 785
 786         private = (struct dasd_eckd_private *) device->private;
 787         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
 788                                    1 /* PSF */  + 1 /* RSSD */ ,
 789                                    (sizeof(struct dasd_psf_prssd_data) +
 790                                     sizeof(struct dasd_rssd_features)),
 791                                    device);
 792         if (IS_ERR(cqr)) {
 793                 DEV_MESSAGE(KERN_WARNING, device, "%s",
 794                             "Could not allocate initialization request");
 795                 return PTR_ERR(cqr);
 796         }
 797         cqr->startdev = device;
 798         cqr->memdev = device;
 799         cqr->block = NULL;
 800         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 801         cqr->retries = 5;
 802         cqr->expires = 10 * HZ;
 803
 804         /* Prepare for Read Subsystem Data */
 805         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
 806         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
 807         prssdp->order = PSF_ORDER_PRSSD;
 808         prssdp->suborder = 0x41;        /* Read Feature Codes */
 809         /* all other bytes of prssdp must be zero */
 810
 811         ccw = cqr->cpaddr;
 812         ccw->cmd_code = DASD_ECKD_CCW_PSF;
 813         ccw->count = sizeof(struct dasd_psf_prssd_data);
 814         ccw->flags |= CCW_FLAG_CC;
 815         ccw->cda = (__u32)(addr_t) prssdp;
 816
 817         /* Read Subsystem Data - feature codes */
 818         features = (struct dasd_rssd_features *) (prssdp + 1);
 819         memset(features, 0, sizeof(struct dasd_rssd_features));
 820
 821         ccw++;
 822         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
 823         ccw->count = sizeof(struct dasd_rssd_features);
 824         ccw->cda = (__u32)(addr_t) features;
 825
 826         cqr->buildclk = get_clock();
 827         cqr->status = DASD_CQR_FILLED;
 828         rc = dasd_sleep_on(cqr);
 829         if (rc == 0) {
 830                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
 831                 features = (struct dasd_rssd_features *) (prssdp + 1);
 832                 memcpy(&private->features, features,
 833                        sizeof(struct dasd_rssd_features));
 834         }
 835         dasd_sfree_request(cqr, cqr->memdev);
 836         return rc;
 837 }
 838
 839
 840 /*
 841  * Build CP for Perform Subsystem Function - SSC.
 842  */
 843 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device)
 844 {
 845         struct dasd_ccw_req *cqr;
 846         struct dasd_psf_ssc_data *psf_ssc_data;
 847         struct ccw1 *ccw;
 848
 849         cqr = dasd_smalloc_request("ECKD", 1 /* PSF */ ,
 850                                   sizeof(struct dasd_psf_ssc_data),
 851                                   device);
 852
 853         if (IS_ERR(cqr)) {
 854                 DEV_MESSAGE(KERN_WARNING, device, "%s",
 855                            "Could not allocate PSF-SSC request");
 856                 return cqr;
 857         }
 858         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
 859         psf_ssc_data->order = PSF_ORDER_SSC;
 860         psf_ssc_data->suborder = 0x88;
 861         psf_ssc_data->reserved[0] = 0x88;
 862
 863         ccw = cqr->cpaddr;
 864         ccw->cmd_code = DASD_ECKD_CCW_PSF;
 865         ccw->cda = (__u32)(addr_t)psf_ssc_data;
 866         ccw->count = 66;
 867
 868         cqr->startdev = device;
 869         cqr->memdev = device;
 870         cqr->block = NULL;
 871         cqr->expires = 10*HZ;
 872         cqr->buildclk = get_clock();
 873         cqr->status = DASD_CQR_FILLED;
 874         return cqr;
 875 }
 876
 877 /*
 878  * Perform Subsystem Function.
 879  * It is necessary to trigger CIO for channel revalidation since this
 880  * call might change behaviour of DASD devices.
 881  */
 882 static int
 883 dasd_eckd_psf_ssc(struct dasd_device *device)
 884 {
 885         struct dasd_ccw_req *cqr;
 886         int rc;
 887
 888         cqr = dasd_eckd_build_psf_ssc(device);
 889         if (IS_ERR(cqr))
 890                 return PTR_ERR(cqr);
 891
 892         rc = dasd_sleep_on(cqr);
 893         if (!rc)
 894                 /* trigger CIO to reprobe devices */
 895                 css_schedule_reprobe();
 896         dasd_sfree_request(cqr, cqr->memdev);
 897         return rc;
 898 }
 899
 900 /*
 901  * Valide storage server of current device.
 902  */
 903 static int dasd_eckd_validate_server(struct dasd_device *device)
 904 {
 905         int rc;
 906         struct dasd_eckd_private *private;
 907
 908         /* Currently PAV is the only reason to 'validate' server on LPAR */
 909         if (dasd_nopav || MACHINE_IS_VM)
 910                 return 0;
 911
 912         rc = dasd_eckd_psf_ssc(device);
 913         /* may be requested feature is not available on server,
 914          * therefore just report error and go ahead */
 915         private = (struct dasd_eckd_private *) device->private;
 916         DEV_MESSAGE(KERN_INFO, device,
 917                     "PSF-SSC on storage subsystem %s.%s.%04x returned rc=%d",
 918                     private->uid.vendor, private->uid.serial,
 919                     private->uid.ssid, rc);
 920         /* RE-Read Configuration Data */
 921         return dasd_eckd_read_conf(device);
 922 }
 923
 924 /*
 925  * Check device characteristics.
 926  * If the device is accessible using ECKD discipline, the device is enabled.
 927  */
 928 static int
 929 dasd_eckd_check_characteristics(struct dasd_device *device)
 930 {
 931         struct dasd_eckd_private *private;
 932         struct dasd_block *block;
 933         void *rdc_data;
 934         int is_known, rc;
 935
 936         private = (struct dasd_eckd_private *) device->private;
 937         if (private == NULL) {
 938                 private = kzalloc(sizeof(struct dasd_eckd_private),
 939                                   GFP_KERNEL | GFP_DMA);
 940                 if (private == NULL) {
 941                         DEV_MESSAGE(KERN_WARNING, device, "%s",
 942                                     "memory allocation failed for private "
 943                                     "data");
 944                         return -ENOMEM;
 945                 }
 946                 device->private = (void *) private;
 947         }
 948         /* Invalidate status of initial analysis. */
 949         private->init_cqr_status = -1;
 950         /* Set default cache operations. */
 951         private->attrib.operation = DASD_NORMAL_CACHE;
 952         private->attrib.nr_cyl = 0;
 953
 954         /* Read Configuration Data */
 955         rc = dasd_eckd_read_conf(device);
 956         if (rc)
 957                 goto out_err1;
 958
 959         /* Generate device unique id and register in devmap */
 960         rc = dasd_eckd_generate_uid(device, &private->uid);
 961         if (rc)
 962                 goto out_err1;
 963         dasd_set_uid(device->cdev, &private->uid);
 964
 965         if (private->uid.type == UA_BASE_DEVICE) {
 966                 block = dasd_alloc_block();
 967                 if (IS_ERR(block)) {
 968                         DEV_MESSAGE(KERN_WARNING, device, "%s",
 969                                     "could not allocate dasd block structure");
 970                         rc = PTR_ERR(block);
 971                         goto out_err1;
 972                 }
 973                 device->block = block;
 974                 block->base = device;
 975         }
 976
 977         /* register lcu with alias handling, enable PAV if this is a new lcu */
 978         is_known = dasd_alias_make_device_known_to_lcu(device);
 979         if (is_known < 0) {
 980                 rc = is_known;
 981                 goto out_err2;
 982         }
 983         if (!is_known) {
 984                 /* new lcu found */
 985                 rc = dasd_eckd_validate_server(device); /* will switch pav on */
 986                 if (rc)
 987                         goto out_err3;
 988         }
 989
 990         /* Read Feature Codes */
 991         rc = dasd_eckd_read_features(device);
 992         if (rc)
 993                 goto out_err3;
 994
 995         /* Read Device Characteristics */
 996         rdc_data = (void *) &(private->rdc_data);
 997         memset(rdc_data, 0, sizeof(rdc_data));
 998         rc = dasd_generic_read_dev_chars(device, "ECKD", &rdc_data, 64);
 999         if (rc) {
1000                 DEV_MESSAGE(KERN_WARNING, device,
1001                             "Read device characteristics returned "
1002                             "rc=%d", rc);
1003                 goto out_err3;
1004         }
1005         DEV_MESSAGE(KERN_INFO, device,
1006                     "%04X/%02X(CU:%04X/%02X) Cyl:%d Head:%d Sec:%d",
1007                     private->rdc_data.dev_type,
1008                     private->rdc_data.dev_model,
1009                     private->rdc_data.cu_type,
1010                     private->rdc_data.cu_model.model,
1011                     private->rdc_data.no_cyl,
1012                     private->rdc_data.trk_per_cyl,
1013                     private->rdc_data.sec_per_trk);
1014         return 0;
1015
1016 out_err3:
1017         dasd_alias_disconnect_device_from_lcu(device);
1018 out_err2:
1019         dasd_free_block(device->block);
1020         device->block = NULL;
1021 out_err1:
1022         kfree(private->conf_data);
1023         kfree(device->private);
1024         device->private = NULL;
1025         return rc;
1026 }
1027
1028 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1029 {
1030         struct dasd_eckd_private *private;
1031
1032         private = (struct dasd_eckd_private *) device->private;
1033         dasd_alias_disconnect_device_from_lcu(device);
1034         private->ned = NULL;
1035         private->sneq = NULL;
1036         private->vdsneq = NULL;
1037         private->gneq = NULL;
1038         private->conf_len = 0;
1039         kfree(private->conf_data);
1040         private->conf_data = NULL;
1041 }
1042
1043 static struct dasd_ccw_req *
1044 dasd_eckd_analysis_ccw(struct dasd_device *device)
1045 {
1046         struct dasd_eckd_private *private;
1047         struct eckd_count *count_data;
1048         struct LO_eckd_data *LO_data;
1049         struct dasd_ccw_req *cqr;
1050         struct ccw1 *ccw;
1051         int cplength, datasize;
1052         int i;
1053
1054         private = (struct dasd_eckd_private *) device->private;
1055
1056         cplength = 8;
1057         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1058         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1059                                    cplength, datasize, device);
1060         if (IS_ERR(cqr))
1061                 return cqr;
1062         ccw = cqr->cpaddr;
1063         /* Define extent for the first 3 tracks. */
1064         define_extent(ccw++, cqr->data, 0, 2,
1065                       DASD_ECKD_CCW_READ_COUNT, device);
1066         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1067         /* Locate record for the first 4 records on track 0. */
1068         ccw[-1].flags |= CCW_FLAG_CC;
1069         locate_record(ccw++, LO_data++, 0, 0, 4,
1070                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1071
1072         count_data = private->count_area;
1073         for (i = 0; i < 4; i++) {
1074                 ccw[-1].flags |= CCW_FLAG_CC;
1075                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1076                 ccw->flags = 0;
1077                 ccw->count = 8;
1078                 ccw->cda = (__u32)(addr_t) count_data;
1079                 ccw++;
1080                 count_data++;
1081         }
1082
1083         /* Locate record for the first record on track 2. */
1084         ccw[-1].flags |= CCW_FLAG_CC;
1085         locate_record(ccw++, LO_data++, 2, 0, 1,
1086                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1087         /* Read count ccw. */
1088         ccw[-1].flags |= CCW_FLAG_CC;
1089         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1090         ccw->flags = 0;
1091         ccw->count = 8;
1092         ccw->cda = (__u32)(addr_t) count_data;
1093
1094         cqr->block = NULL;
1095         cqr->startdev = device;
1096         cqr->memdev = device;
1097         cqr->retries = 0;
1098         cqr->buildclk = get_clock();
1099         cqr->status = DASD_CQR_FILLED;
1100         return cqr;
1101 }
1102
1103 /*
1104  * This is the callback function for the init_analysis cqr. It saves
1105  * the status of the initial analysis ccw before it frees it and kicks
1106  * the device to continue the startup sequence. This will call
1107  * dasd_eckd_do_analysis again (if the devices has not been marked
1108  * for deletion in the meantime).
1109  */
1110 static void
1111 dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, void *data)
1112 {
1113         struct dasd_eckd_private *private;
1114         struct dasd_device *device;
1115
1116         device = init_cqr->startdev;
1117         private = (struct dasd_eckd_private *) device->private;
1118         private->init_cqr_status = init_cqr->status;
1119         dasd_sfree_request(init_cqr, device);
1120         dasd_kick_device(device);
1121 }
1122
1123 static int
1124 dasd_eckd_start_analysis(struct dasd_block *block)
1125 {
1126         struct dasd_eckd_private *private;
1127         struct dasd_ccw_req *init_cqr;
1128
1129         private = (struct dasd_eckd_private *) block->base->private;
1130         init_cqr = dasd_eckd_analysis_ccw(block->base);
1131         if (IS_ERR(init_cqr))
1132                 return PTR_ERR(init_cqr);
1133         init_cqr->callback = dasd_eckd_analysis_callback;
1134         init_cqr->callback_data = NULL;
1135         init_cqr->expires = 5*HZ;
1136         dasd_add_request_head(init_cqr);
1137         return -EAGAIN;
1138 }
1139
1140 static int
1141 dasd_eckd_end_analysis(struct dasd_block *block)
1142 {
1143         struct dasd_device *device;
1144         struct dasd_eckd_private *private;
1145         struct eckd_count *count_area;
1146         unsigned int sb, blk_per_trk;
1147         int status, i;
1148
1149         device = block->base;
1150         private = (struct dasd_eckd_private *) device->private;
1151         status = private->init_cqr_status;
1152         private->init_cqr_status = -1;
1153         if (status != DASD_CQR_DONE) {
1154                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1155                             "volume analysis returned unformatted disk");
1156                 return -EMEDIUMTYPE;
1157         }
1158
1159         private->uses_cdl = 1;
1160         /* Calculate number of blocks/records per track. */
1161         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1162         /* Check Track 0 for Compatible Disk Layout */
1163         count_area = NULL;
1164         for (i = 0; i < 3; i++) {
1165                 if (private->count_area[i].kl != 4 ||
1166                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
1167                         private->uses_cdl = 0;
1168                         break;
1169                 }
1170         }
1171         if (i == 3)
1172                 count_area = &private->count_area[4];
1173
1174         if (private->uses_cdl == 0) {
1175                 for (i = 0; i < 5; i++) {
1176                         if ((private->count_area[i].kl != 0) ||
1177                             (private->count_area[i].dl !=
1178                              private->count_area[0].dl))
1179                                 break;
1180                 }
1181                 if (i == 5)
1182                         count_area = &private->count_area[0];
1183         } else {
1184                 if (private->count_area[3].record == 1)
1185                         DEV_MESSAGE(KERN_WARNING, device, "%s",
1186                                     "Trk 0: no records after VTOC!");
1187         }
1188         if (count_area != NULL && count_area->kl == 0) {
1189                 /* we found notthing violating our disk layout */
1190                 if (dasd_check_blocksize(count_area->dl) == 0)
1191                         block->bp_block = count_area->dl;
1192         }
1193         if (block->bp_block == 0) {
1194                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1195                             "Volume has incompatible disk layout");
1196                 return -EMEDIUMTYPE;
1197         }
1198         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1199         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1200                 block->s2b_shift++;
1201
1202         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1203         block->blocks = (private->rdc_data.no_cyl *
1204                           private->rdc_data.trk_per_cyl *
1205                           blk_per_trk);
1206
1207         DEV_MESSAGE(KERN_INFO, device,
1208                     "(%dkB blks): %dkB at %dkB/trk %s",
1209                     (block->bp_block >> 10),
1210                     ((private->rdc_data.no_cyl *
1211                       private->rdc_data.trk_per_cyl *
1212                       blk_per_trk * (block->bp_block >> 9)) >> 1),
1213                     ((blk_per_trk * block->bp_block) >> 10),
1214                     private->uses_cdl ?
1215                     "compatible disk layout" : "linux disk layout");
1216
1217         return 0;
1218 }
1219
1220 static int dasd_eckd_do_analysis(struct dasd_block *block)
1221 {
1222         struct dasd_eckd_private *private;
1223
1224         private = (struct dasd_eckd_private *) block->base->private;
1225         if (private->init_cqr_status < 0)
1226                 return dasd_eckd_start_analysis(block);
1227         else
1228                 return dasd_eckd_end_analysis(block);
1229 }
1230
1231 static int dasd_eckd_ready_to_online(struct dasd_device *device)
1232 {
1233         return dasd_alias_add_device(device);
1234 };
1235
1236 static int dasd_eckd_online_to_ready(struct dasd_device *device)
1237 {
1238         return dasd_alias_remove_device(device);
1239 };
1240
1241 static int
1242 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
1243 {
1244         struct dasd_eckd_private *private;
1245
1246         private = (struct dasd_eckd_private *) block->base->private;
1247         if (dasd_check_blocksize(block->bp_block) == 0) {
1248                 geo->sectors = recs_per_track(&private->rdc_data,
1249                                               0, block->bp_block);
1250         }
1251         geo->cylinders = private->rdc_data.no_cyl;
1252         geo->heads = private->rdc_data.trk_per_cyl;
1253         return 0;
1254 }
1255
1256 static struct dasd_ccw_req *
1257 dasd_eckd_format_device(struct dasd_device * device,
1258                         struct format_data_t * fdata)
1259 {
1260         struct dasd_eckd_private *private;
1261         struct dasd_ccw_req *fcp;
1262         struct eckd_count *ect;
1263         struct ccw1 *ccw;
1264         void *data;
1265         int rpt, cyl, head;
1266         int cplength, datasize;
1267         int i;
1268
1269         private = (struct dasd_eckd_private *) device->private;
1270         rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
1271         cyl = fdata->start_unit / private->rdc_data.trk_per_cyl;
1272         head = fdata->start_unit % private->rdc_data.trk_per_cyl;
1273
1274         /* Sanity checks. */
1275         if (fdata->start_unit >=
1276             (private->rdc_data.no_cyl * private->rdc_data.trk_per_cyl)) {
1277                 DEV_MESSAGE(KERN_INFO, device, "Track no %d too big!",
1278                             fdata->start_unit);
1279                 return ERR_PTR(-EINVAL);
1280         }
1281         if (fdata->start_unit > fdata->stop_unit) {
1282                 DEV_MESSAGE(KERN_INFO, device, "Track %d reached! ending.",
1283                             fdata->start_unit);
1284                 return ERR_PTR(-EINVAL);
1285         }
1286         if (dasd_check_blocksize(fdata->blksize) != 0) {
1287                 DEV_MESSAGE(KERN_WARNING, device,
1288                             "Invalid blocksize %d...terminating!",
1289                             fdata->blksize);
1290                 return ERR_PTR(-EINVAL);
1291         }
1292
1293         /*
1294          * fdata->intensity is a bit string that tells us what to do:
1295          *   Bit 0: write record zero
1296          *   Bit 1: write home address, currently not supported
1297          *   Bit 2: invalidate tracks
1298          *   Bit 3: use OS/390 compatible disk layout (cdl)
1299          * Only some bit combinations do make sense.
1300          */
1301         switch (fdata->intensity) {
1302         case 0x00:      /* Normal format */
1303         case 0x08:      /* Normal format, use cdl. */
1304                 cplength = 2 + rpt;
1305                 datasize = sizeof(struct DE_eckd_data) +
1306                         sizeof(struct LO_eckd_data) +
1307                         rpt * sizeof(struct eckd_count);
1308                 break;
1309         case 0x01:      /* Write record zero and format track. */
1310         case 0x09:      /* Write record zero and format track, use cdl. */
1311                 cplength = 3 + rpt;
1312                 datasize = sizeof(struct DE_eckd_data) +
1313                         sizeof(struct LO_eckd_data) +
1314                         sizeof(struct eckd_count) +
1315                         rpt * sizeof(struct eckd_count);
1316                 break;
1317         case 0x04:      /* Invalidate track. */
1318         case 0x0c:      /* Invalidate track, use cdl. */
1319                 cplength = 3;
1320                 datasize = sizeof(struct DE_eckd_data) +
1321                         sizeof(struct LO_eckd_data) +
1322                         sizeof(struct eckd_count);
1323                 break;
1324         default:
1325                 DEV_MESSAGE(KERN_WARNING, device, "Invalid flags 0x%x.",
1326                             fdata->intensity);
1327                 return ERR_PTR(-EINVAL);
1328         }
1329         /* Allocate the format ccw request. */
1330         fcp = dasd_smalloc_request(dasd_eckd_discipline.name,
1331                                    cplength, datasize, device);
1332         if (IS_ERR(fcp))
1333                 return fcp;
1334
1335         data = fcp->data;
1336         ccw = fcp->cpaddr;
1337
1338         switch (fdata->intensity & ~0x08) {
1339         case 0x00: /* Normal format. */
1340                 define_extent(ccw++, (struct DE_eckd_data *) data,
1341                               fdata->start_unit, fdata->start_unit,
1342                               DASD_ECKD_CCW_WRITE_CKD, device);
1343                 data += sizeof(struct DE_eckd_data);
1344                 ccw[-1].flags |= CCW_FLAG_CC;
1345                 locate_record(ccw++, (struct LO_eckd_data *) data,
1346                               fdata->start_unit, 0, rpt,
1347                               DASD_ECKD_CCW_WRITE_CKD, device,
1348                               fdata->blksize);
1349                 data += sizeof(struct LO_eckd_data);
1350                 break;
1351         case 0x01: /* Write record zero + format track. */
1352                 define_extent(ccw++, (struct DE_eckd_data *) data,
1353                               fdata->start_unit, fdata->start_unit,
1354                               DASD_ECKD_CCW_WRITE_RECORD_ZERO,
1355                               device);
1356                 data += sizeof(struct DE_eckd_data);
1357                 ccw[-1].flags |= CCW_FLAG_CC;
1358                 locate_record(ccw++, (struct LO_eckd_data *) data,
1359                               fdata->start_unit, 0, rpt + 1,
1360                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
1361                               device->block->bp_block);
1362                 data += sizeof(struct LO_eckd_data);
1363                 break;
1364         case 0x04: /* Invalidate track. */
1365                 define_extent(ccw++, (struct DE_eckd_data *) data,
1366                               fdata->start_unit, fdata->start_unit,
1367                               DASD_ECKD_CCW_WRITE_CKD, device);
1368                 data += sizeof(struct DE_eckd_data);
1369                 ccw[-1].flags |= CCW_FLAG_CC;
1370                 locate_record(ccw++, (struct LO_eckd_data *) data,
1371                               fdata->start_unit, 0, 1,
1372                               DASD_ECKD_CCW_WRITE_CKD, device, 8);
1373                 data += sizeof(struct LO_eckd_data);
1374                 break;
1375         }
1376         if (fdata->intensity & 0x01) {  /* write record zero */
1377                 ect = (struct eckd_count *) data;
1378                 data += sizeof(struct eckd_count);
1379                 ect->cyl = cyl;
1380                 ect->head = head;
1381                 ect->record = 0;
1382                 ect->kl = 0;
1383                 ect->dl = 8;
1384                 ccw[-1].flags |= CCW_FLAG_CC;
1385                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
1386                 ccw->flags = CCW_FLAG_SLI;
1387                 ccw->count = 8;
1388                 ccw->cda = (__u32)(addr_t) ect;
1389                 ccw++;
1390         }
1391         if ((fdata->intensity & ~0x08) & 0x04) {        /* erase track */
1392                 ect = (struct eckd_count *) data;
1393                 data += sizeof(struct eckd_count);
1394                 ect->cyl = cyl;
1395                 ect->head = head;
1396                 ect->record = 1;
1397                 ect->kl = 0;
1398                 ect->dl = 0;
1399                 ccw[-1].flags |= CCW_FLAG_CC;
1400                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1401                 ccw->flags = CCW_FLAG_SLI;
1402                 ccw->count = 8;
1403                 ccw->cda = (__u32)(addr_t) ect;
1404         } else {                /* write remaining records */
1405                 for (i = 0; i < rpt; i++) {
1406                         ect = (struct eckd_count *) data;
1407                         data += sizeof(struct eckd_count);
1408                         ect->cyl = cyl;
1409                         ect->head = head;
1410                         ect->record = i + 1;
1411                         ect->kl = 0;
1412                         ect->dl = fdata->blksize;
1413                         /* Check for special tracks 0-1 when formatting CDL */
1414                         if ((fdata->intensity & 0x08) &&
1415                             fdata->start_unit == 0) {
1416                                 if (i < 3) {
1417                                         ect->kl = 4;
1418                                         ect->dl = sizes_trk0[i] - 4;
1419                                 }
1420                         }
1421                         if ((fdata->intensity & 0x08) &&
1422                             fdata->start_unit == 1) {
1423                                 ect->kl = 44;
1424                                 ect->dl = LABEL_SIZE - 44;
1425                         }
1426                         ccw[-1].flags |= CCW_FLAG_CC;
1427                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1428                         ccw->flags = CCW_FLAG_SLI;
1429                         ccw->count = 8;
1430                         ccw->cda = (__u32)(addr_t) ect;
1431                         ccw++;
1432                 }
1433         }
1434         fcp->startdev = device;
1435         fcp->memdev = device;
1436         clear_bit(DASD_CQR_FLAGS_USE_ERP, &fcp->flags);
1437         fcp->retries = 5;       /* set retry counter to enable default ERP */
1438         fcp->buildclk = get_clock();
1439         fcp->status = DASD_CQR_FILLED;
1440         return fcp;
1441 }
1442
1443 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
1444 {
1445         cqr->status = DASD_CQR_FILLED;
1446         if (cqr->block && (cqr->startdev != cqr->block->base)) {
1447                 dasd_eckd_reset_ccw_to_base_io(cqr);
1448                 cqr->startdev = cqr->block->base;
1449         }
1450 };
1451
1452 static dasd_erp_fn_t
1453 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
1454 {
1455         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
1456         struct ccw_device *cdev = device->cdev;
1457
1458         switch (cdev->id.cu_type) {
1459         case 0x3990:
1460         case 0x2105:
1461         case 0x2107:
1462         case 0x1750:
1463                 return dasd_3990_erp_action;
1464         case 0x9343:
1465         case 0x3880:
1466         default:
1467                 return dasd_default_erp_action;
1468         }
1469 }
1470
1471 static dasd_erp_fn_t
1472 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
1473 {
1474         return dasd_default_erp_postaction;
1475 }
1476
1477
1478 static void dasd_eckd_handle_unsolicited_interrupt(struct dasd_device *device,
1479                                                    struct irb *irb)
1480 {
1481         char mask;
1482
1483         /* first of all check for state change pending interrupt */
1484         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
1485         if ((irb->scsw.cmd.dstat & mask) == mask) {
1486                 dasd_generic_handle_state_change(device);
1487                 return;
1488         }
1489
1490         /* summary unit check */
1491         if ((irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
1492             (irb->ecw[7] == 0x0D)) {
1493                 dasd_alias_handle_summary_unit_check(device, irb);
1494                 return;
1495         }
1496
1497
1498         /* service information message SIM */
1499         if (irb->esw.esw0.erw.cons && (irb->ecw[27] & DASD_SENSE_BIT_0) &&
1500             ((irb->ecw[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
1501                 dasd_3990_erp_handle_sim(device, irb->ecw);
1502                 dasd_schedule_device_bh(device);
1503                 return;
1504         }
1505
1506         if ((irb->scsw.cmd.cc == 1) &&
1507             (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1508             (irb->scsw.cmd.actl & SCSW_ACTL_START_PEND) &&
1509             (irb->scsw.cmd.stctl & SCSW_STCTL_STATUS_PEND)) {
1510                 /* fake irb do nothing, they are handled elsewhere */
1511                 dasd_schedule_device_bh(device);
1512                 return;
1513         }
1514
1515         if (!(irb->esw.esw0.erw.cons)) {
1516                 /* just report other unsolicited interrupts */
1517                 DEV_MESSAGE(KERN_ERR, device, "%s",
1518                             "unsolicited interrupt received");
1519         } else {
1520                 DEV_MESSAGE(KERN_ERR, device, "%s",
1521                             "unsolicited interrupt received "
1522                             "(sense available)");
1523                 device->discipline->dump_sense(device, NULL, irb);
1524         }
1525
1526         dasd_schedule_device_bh(device);
1527         return;
1528 };
1529
1530 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
1531                                                struct dasd_block *block,
1532                                                struct request *req)
1533 {
1534         struct dasd_eckd_private *private;
1535         unsigned long *idaws;
1536         struct LO_eckd_data *LO_data;
1537         struct dasd_ccw_req *cqr;
1538         struct ccw1 *ccw;
1539         struct req_iterator iter;
1540         struct bio_vec *bv;
1541         char *dst;
1542         unsigned int blksize, blk_per_trk, off;
1543         int count, cidaw, cplength, datasize;
1544         sector_t recid, first_rec, last_rec;
1545         sector_t first_trk, last_trk;
1546         unsigned int first_offs, last_offs;
1547         unsigned char cmd, rcmd;
1548         int use_prefix;
1549         struct dasd_device *basedev;
1550
1551         basedev = block->base;
1552         private = (struct dasd_eckd_private *) basedev->private;
1553         if (rq_data_dir(req) == READ)
1554                 cmd = DASD_ECKD_CCW_READ_MT;
1555         else if (rq_data_dir(req) == WRITE)
1556                 cmd = DASD_ECKD_CCW_WRITE_MT;
1557         else
1558                 return ERR_PTR(-EINVAL);
1559         /* Calculate number of blocks/records per track. */
1560         blksize = block->bp_block;
1561         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
1562         /* Calculate record id of first and last block. */
1563         first_rec = first_trk = req->sector >> block->s2b_shift;
1564         first_offs = sector_div(first_trk, blk_per_trk);
1565         last_rec = last_trk =
1566                 (req->sector + req->nr_sectors - 1) >> block->s2b_shift;
1567         last_offs = sector_div(last_trk, blk_per_trk);
1568         /* Check struct bio and count the number of blocks for the request. */
1569         count = 0;
1570         cidaw = 0;
1571         rq_for_each_segment(bv, req, iter) {
1572                 if (bv->bv_len & (blksize - 1))
1573                         /* Eckd can only do full blocks. */
1574                         return ERR_PTR(-EINVAL);
1575                 count += bv->bv_len >> (block->s2b_shift + 9);
1576 #if defined(CONFIG_64BIT)
1577                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
1578                         cidaw += bv->bv_len >> (block->s2b_shift + 9);
1579 #endif
1580         }
1581         /* Paranoia. */
1582         if (count != last_rec - first_rec + 1)
1583                 return ERR_PTR(-EINVAL);
1584
1585         /* use the prefix command if available */
1586         use_prefix = private->features.feature[8] & 0x01;
1587         if (use_prefix) {
1588                 /* 1x prefix + number of blocks */
1589                 cplength = 2 + count;
1590                 /* 1x prefix + cidaws*sizeof(long) */
1591                 datasize = sizeof(struct PFX_eckd_data) +
1592                         sizeof(struct LO_eckd_data) +
1593                         cidaw * sizeof(unsigned long);
1594         } else {
1595                 /* 1x define extent + 1x locate record + number of blocks */
1596                 cplength = 2 + count;
1597                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
1598                 datasize = sizeof(struct DE_eckd_data) +
1599                         sizeof(struct LO_eckd_data) +
1600                         cidaw * sizeof(unsigned long);
1601         }
1602         /* Find out the number of additional locate record ccws for cdl. */
1603         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
1604                 if (last_rec >= 2*blk_per_trk)
1605                         count = 2*blk_per_trk - first_rec;
1606                 cplength += count;
1607                 datasize += count*sizeof(struct LO_eckd_data);
1608         }
1609         /* Allocate the ccw request. */
1610         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1611                                    cplength, datasize, startdev);
1612         if (IS_ERR(cqr))
1613                 return cqr;
1614         ccw = cqr->cpaddr;
1615         /* First ccw is define extent or prefix. */
1616         if (use_prefix) {
1617                 if (prefix(ccw++, cqr->data, first_trk,
1618                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
1619                         /* Clock not in sync and XRC is enabled.
1620                          * Try again later.
1621                          */
1622                         dasd_sfree_request(cqr, startdev);
1623                         return ERR_PTR(-EAGAIN);
1624                 }
1625                 idaws = (unsigned long *) (cqr->data +
1626                                            sizeof(struct PFX_eckd_data));
1627         } else {
1628                 if (define_extent(ccw++, cqr->data, first_trk,
1629                                   last_trk, cmd, startdev) == -EAGAIN) {
1630                         /* Clock not in sync and XRC is enabled.
1631                          * Try again later.
1632                          */
1633                         dasd_sfree_request(cqr, startdev);
1634                         return ERR_PTR(-EAGAIN);
1635                 }
1636                 idaws = (unsigned long *) (cqr->data +
1637                                            sizeof(struct DE_eckd_data));
1638         }
1639         /* Build locate_record+read/write/ccws. */
1640         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
1641         recid = first_rec;
1642         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
1643                 /* Only standard blocks so there is just one locate record. */
1644                 ccw[-1].flags |= CCW_FLAG_CC;
1645                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
1646                               last_rec - recid + 1, cmd, basedev, blksize);
1647         }
1648         rq_for_each_segment(bv, req, iter) {
1649                 dst = page_address(bv->bv_page) + bv->bv_offset;
1650                 if (dasd_page_cache) {
1651                         char *copy = kmem_cache_alloc(dasd_page_cache,
1652                                                       GFP_DMA | __GFP_NOWARN);
1653                         if (copy && rq_data_dir(req) == WRITE)
1654                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
1655                         if (copy)
1656                                 dst = copy + bv->bv_offset;
1657                 }
1658                 for (off = 0; off < bv->bv_len; off += blksize) {
1659                         sector_t trkid = recid;
1660                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
1661                         rcmd = cmd;
1662                         count = blksize;
1663                         /* Locate record for cdl special block ? */
1664                         if (private->uses_cdl && recid < 2*blk_per_trk) {
1665                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
1666                                         rcmd |= 0x8;
1667                                         count = dasd_eckd_cdl_reclen(recid);
1668                                         if (count < blksize &&
1669                                             rq_data_dir(req) == READ)
1670                                                 memset(dst + count, 0xe5,
1671                                                        blksize - count);
1672                                 }
1673                                 ccw[-1].flags |= CCW_FLAG_CC;
1674                                 locate_record(ccw++, LO_data++,
1675                                               trkid, recoffs + 1,
1676                                               1, rcmd, basedev, count);
1677                         }
1678                         /* Locate record for standard blocks ? */
1679                         if (private->uses_cdl && recid == 2*blk_per_trk) {
1680                                 ccw[-1].flags |= CCW_FLAG_CC;
1681                                 locate_record(ccw++, LO_data++,
1682                                               trkid, recoffs + 1,
1683                                               last_rec - recid + 1,
1684                                               cmd, basedev, count);
1685                         }
1686                         /* Read/write ccw. */
1687                         ccw[-1].flags |= CCW_FLAG_CC;
1688                         ccw->cmd_code = rcmd;
1689                         ccw->count = count;
1690                         if (idal_is_needed(dst, blksize)) {
1691                                 ccw->cda = (__u32)(addr_t) idaws;
1692                                 ccw->flags = CCW_FLAG_IDA;
1693                                 idaws = idal_create_words(idaws, dst, blksize);
1694                         } else {
1695                                 ccw->cda = (__u32)(addr_t) dst;
1696                                 ccw->flags = 0;
1697                         }
1698                         ccw++;
1699                         dst += blksize;
1700                         recid++;
1701                 }
1702         }
1703         if (blk_noretry_request(req))
1704                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1705         cqr->startdev = startdev;
1706         cqr->memdev = startdev;
1707         cqr->block = block;
1708         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
1709         cqr->lpm = private->path_data.ppm;
1710         cqr->retries = 256;
1711         cqr->buildclk = get_clock();
1712         cqr->status = DASD_CQR_FILLED;
1713         return cqr;
1714 }
1715
1716 static int
1717 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
1718 {
1719         struct dasd_eckd_private *private;
1720         struct ccw1 *ccw;
1721         struct req_iterator iter;
1722         struct bio_vec *bv;
1723         char *dst, *cda;
1724         unsigned int blksize, blk_per_trk, off;
1725         sector_t recid;
1726         int status;
1727
1728         if (!dasd_page_cache)
1729                 goto out;
1730         private = (struct dasd_eckd_private *) cqr->block->base->private;
1731         blksize = cqr->block->bp_block;
1732         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
1733         recid = req->sector >> cqr->block->s2b_shift;
1734         ccw = cqr->cpaddr;
1735         /* Skip over define extent & locate record. */
1736         ccw++;
1737         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
1738                 ccw++;
1739         rq_for_each_segment(bv, req, iter) {
1740                 dst = page_address(bv->bv_page) + bv->bv_offset;
1741                 for (off = 0; off < bv->bv_len; off += blksize) {
1742                         /* Skip locate record. */
1743                         if (private->uses_cdl && recid <= 2*blk_per_trk)
1744                                 ccw++;
1745                         if (dst) {
1746                                 if (ccw->flags & CCW_FLAG_IDA)
1747                                         cda = *((char **)((addr_t) ccw->cda));
1748                                 else
1749                                         cda = (char *)((addr_t) ccw->cda);
1750                                 if (dst != cda) {
1751                                         if (rq_data_dir(req) == READ)
1752                                                 memcpy(dst, cda, bv->bv_len);
1753                                         kmem_cache_free(dasd_page_cache,
1754                                             (void *)((addr_t)cda & PAGE_MASK));
1755                                 }
1756                                 dst = NULL;
1757                         }
1758                         ccw++;
1759                         recid++;
1760                 }
1761         }
1762 out:
1763         status = cqr->status == DASD_CQR_DONE;
1764         dasd_sfree_request(cqr, cqr->memdev);
1765         return status;
1766 }
1767
1768 /*
1769  * Modify ccw chain in cqr so it can be started on a base device.
1770  *
1771  * Note that this is not enough to restart the cqr!
1772  * Either reset cqr->startdev as well (summary unit check handling)
1773  * or restart via separate cqr (as in ERP handling).
1774  */
1775 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
1776 {
1777         struct ccw1 *ccw;
1778         struct PFX_eckd_data *pfxdata;
1779
1780         ccw = cqr->cpaddr;
1781         pfxdata = cqr->data;
1782
1783         if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
1784                 pfxdata->validity.verify_base = 0;
1785                 pfxdata->validity.hyper_pav = 0;
1786         }
1787 }
1788
1789 #define DASD_ECKD_CHANQ_MAX_SIZE 4
1790
1791 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
1792                                                      struct dasd_block *block,
1793                                                      struct request *req)
1794 {
1795         struct dasd_eckd_private *private;
1796         struct dasd_device *startdev;
1797         unsigned long flags;
1798         struct dasd_ccw_req *cqr;
1799
1800         startdev = dasd_alias_get_start_dev(base);
1801         if (!startdev)
1802                 startdev = base;
1803         private = (struct dasd_eckd_private *) startdev->private;
1804         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
1805                 return ERR_PTR(-EBUSY);
1806
1807         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
1808         private->count++;
1809         cqr = dasd_eckd_build_cp(startdev, block, req);
1810         if (IS_ERR(cqr))
1811                 private->count--;
1812         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
1813         return cqr;
1814 }
1815
1816 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
1817                                    struct request *req)
1818 {
1819         struct dasd_eckd_private *private;
1820         unsigned long flags;
1821
1822         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
1823         private = (struct dasd_eckd_private *) cqr->memdev->private;
1824         private->count--;
1825         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
1826         return dasd_eckd_free_cp(cqr, req);
1827 }
1828
1829 static int
1830 dasd_eckd_fill_info(struct dasd_device * device,
1831                     struct dasd_information2_t * info)
1832 {
1833         struct dasd_eckd_private *private;
1834
1835         private = (struct dasd_eckd_private *) device->private;
1836         info->label_block = 2;
1837         info->FBA_layout = private->uses_cdl ? 0 : 1;
1838         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
1839         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
1840         memcpy(info->characteristics, &private->rdc_data,
1841                sizeof(struct dasd_eckd_characteristics));
1842         info->confdata_size = min((unsigned long)private->conf_len,
1843                                   sizeof(info->configuration_data));
1844         memcpy(info->configuration_data, private->conf_data,
1845                info->confdata_size);
1846         return 0;
1847 }
1848
1849 /*
1850  * SECTION: ioctl functions for eckd devices.
1851  */
1852
1853 /*
1854  * Release device ioctl.
1855  * Buils a channel programm to releases a prior reserved
1856  * (see dasd_eckd_reserve) device.
1857  */
1858 static int
1859 dasd_eckd_release(struct dasd_device *device)
1860 {
1861         struct dasd_ccw_req *cqr;
1862         int rc;
1863
1864         if (!capable(CAP_SYS_ADMIN))
1865                 return -EACCES;
1866
1867         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1868                                    1, 32, device);
1869         if (IS_ERR(cqr)) {
1870                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1871                             "Could not allocate initialization request");
1872                 return PTR_ERR(cqr);
1873         }
1874         cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RELEASE;
1875         cqr->cpaddr->flags |= CCW_FLAG_SLI;
1876         cqr->cpaddr->count = 32;
1877         cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1878         cqr->startdev = device;
1879         cqr->memdev = device;
1880         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1881         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1882         cqr->retries = 2;       /* set retry counter to enable basic ERP */
1883         cqr->expires = 2 * HZ;
1884         cqr->buildclk = get_clock();
1885         cqr->status = DASD_CQR_FILLED;
1886
1887         rc = dasd_sleep_on_immediatly(cqr);
1888
1889         dasd_sfree_request(cqr, cqr->memdev);
1890         return rc;
1891 }
1892
1893 /*
1894  * Reserve device ioctl.
1895  * Options are set to 'synchronous wait for interrupt' and
1896  * 'timeout the request'. This leads to a terminate IO if
1897  * the interrupt is outstanding for a certain time.
1898  */
1899 static int
1900 dasd_eckd_reserve(struct dasd_device *device)
1901 {
1902         struct dasd_ccw_req *cqr;
1903         int rc;
1904
1905         if (!capable(CAP_SYS_ADMIN))
1906                 return -EACCES;
1907
1908         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1909                                    1, 32, device);
1910         if (IS_ERR(cqr)) {
1911                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1912                             "Could not allocate initialization request");
1913                 return PTR_ERR(cqr);
1914         }
1915         cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RESERVE;
1916         cqr->cpaddr->flags |= CCW_FLAG_SLI;
1917         cqr->cpaddr->count = 32;
1918         cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1919         cqr->startdev = device;
1920         cqr->memdev = device;
1921         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1922         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1923         cqr->retries = 2;       /* set retry counter to enable basic ERP */
1924         cqr->expires = 2 * HZ;
1925         cqr->buildclk = get_clock();
1926         cqr->status = DASD_CQR_FILLED;
1927
1928         rc = dasd_sleep_on_immediatly(cqr);
1929
1930         dasd_sfree_request(cqr, cqr->memdev);
1931         return rc;
1932 }
1933
1934 /*
1935  * Steal lock ioctl - unconditional reserve device.
1936  * Buils a channel programm to break a device's reservation.
1937  * (unconditional reserve)
1938  */
1939 static int
1940 dasd_eckd_steal_lock(struct dasd_device *device)
1941 {
1942         struct dasd_ccw_req *cqr;
1943         int rc;
1944
1945         if (!capable(CAP_SYS_ADMIN))
1946                 return -EACCES;
1947
1948         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1949                                    1, 32, device);
1950         if (IS_ERR(cqr)) {
1951                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1952                             "Could not allocate initialization request");
1953                 return PTR_ERR(cqr);
1954         }
1955         cqr->cpaddr->cmd_code = DASD_ECKD_CCW_SLCK;
1956         cqr->cpaddr->flags |= CCW_FLAG_SLI;
1957         cqr->cpaddr->count = 32;
1958         cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1959         cqr->startdev = device;
1960         cqr->memdev = device;
1961         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1962         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1963         cqr->retries = 2;       /* set retry counter to enable basic ERP */
1964         cqr->expires = 2 * HZ;
1965         cqr->buildclk = get_clock();
1966         cqr->status = DASD_CQR_FILLED;
1967
1968         rc = dasd_sleep_on_immediatly(cqr);
1969
1970         dasd_sfree_request(cqr, cqr->memdev);
1971         return rc;
1972 }
1973
1974 /*
1975  * Read performance statistics
1976  */
1977 static int
1978 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
1979 {
1980         struct dasd_psf_prssd_data *prssdp;
1981         struct dasd_rssd_perf_stats_t *stats;
1982         struct dasd_ccw_req *cqr;
1983         struct ccw1 *ccw;
1984         int rc;
1985
1986         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1987                                    1 /* PSF */  + 1 /* RSSD */ ,
1988                                    (sizeof(struct dasd_psf_prssd_data) +
1989                                     sizeof(struct dasd_rssd_perf_stats_t)),
1990                                    device);
1991         if (IS_ERR(cqr)) {
1992                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1993                             "Could not allocate initialization request");
1994                 return PTR_ERR(cqr);
1995         }
1996         cqr->startdev = device;
1997         cqr->memdev = device;
1998         cqr->retries = 0;
1999         cqr->expires = 10 * HZ;
2000
2001         /* Prepare for Read Subsystem Data */
2002         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
2003         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
2004         prssdp->order = PSF_ORDER_PRSSD;
2005         prssdp->suborder = 0x01;        /* Performance Statistics */
2006         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
2007
2008         ccw = cqr->cpaddr;
2009         ccw->cmd_code = DASD_ECKD_CCW_PSF;
2010         ccw->count = sizeof(struct dasd_psf_prssd_data);
2011         ccw->flags |= CCW_FLAG_CC;
2012         ccw->cda = (__u32)(addr_t) prssdp;
2013
2014         /* Read Subsystem Data - Performance Statistics */
2015         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
2016         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
2017
2018         ccw++;
2019         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
2020         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
2021         ccw->cda = (__u32)(addr_t) stats;
2022
2023         cqr->buildclk = get_clock();
2024         cqr->status = DASD_CQR_FILLED;
2025         rc = dasd_sleep_on(cqr);
2026         if (rc == 0) {
2027                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
2028                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
2029                 if (copy_to_user(argp, stats,
2030                                  sizeof(struct dasd_rssd_perf_stats_t)))
2031                         rc = -EFAULT;
2032         }
2033         dasd_sfree_request(cqr, cqr->memdev);
2034         return rc;
2035 }
2036
2037 /*
2038  * Get attributes (cache operations)
2039  * Returnes the cache attributes used in Define Extend (DE).
2040  */
2041 static int
2042 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
2043 {
2044         struct dasd_eckd_private *private =
2045                 (struct dasd_eckd_private *)device->private;
2046         struct attrib_data_t attrib = private->attrib;
2047         int rc;
2048
2049         if (!capable(CAP_SYS_ADMIN))
2050                 return -EACCES;
2051         if (!argp)
2052                 return -EINVAL;
2053
2054         rc = 0;
2055         if (copy_to_user(argp, (long *) &attrib,
2056                          sizeof(struct attrib_data_t)))
2057                 rc = -EFAULT;
2058
2059         return rc;
2060 }
2061
2062 /*
2063  * Set attributes (cache operations)
2064  * Stores the attributes for cache operation to be used in Define Extend (DE).
2065  */
2066 static int
2067 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
2068 {
2069         struct dasd_eckd_private *private =
2070                 (struct dasd_eckd_private *)device->private;
2071         struct attrib_data_t attrib;
2072
2073         if (!capable(CAP_SYS_ADMIN))
2074                 return -EACCES;
2075         if (!argp)
2076                 return -EINVAL;
2077
2078         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
2079                 return -EFAULT;
2080         private->attrib = attrib;
2081
2082         DEV_MESSAGE(KERN_INFO, device,
2083                     "cache operation mode set to %x (%i cylinder prestage)",
2084                     private->attrib.operation, private->attrib.nr_cyl);
2085         return 0;
2086 }
2087
2088 /*
2089  * Issue syscall I/O to EMC Symmetrix array.
2090  * CCWs are PSF and RSSD
2091  */
2092 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
2093 {
2094         struct dasd_symmio_parms usrparm;
2095         char *psf_data, *rssd_result;
2096         struct dasd_ccw_req *cqr;
2097         struct ccw1 *ccw;
2098         int rc;
2099
2100         /* Copy parms from caller */
2101         rc = -EFAULT;
2102         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
2103                 goto out;
2104 #ifndef CONFIG_64BIT
2105         /* Make sure pointers are sane even on 31 bit. */
2106         if ((usrparm.psf_data >> 32) != 0 || (usrparm.rssd_result >> 32) != 0) {
2107                 rc = -EINVAL;
2108                 goto out;
2109         }
2110 #endif
2111         /* alloc I/O data area */
2112         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
2113         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
2114         if (!psf_data || !rssd_result) {
2115                 rc = -ENOMEM;
2116                 goto out_free;
2117         }
2118
2119         /* get syscall header from user space */
2120         rc = -EFAULT;
2121         if (copy_from_user(psf_data,
2122                            (void __user *)(unsigned long) usrparm.psf_data,
2123                            usrparm.psf_data_len))
2124                 goto out_free;
2125
2126         /* sanity check on syscall header */
2127         if (psf_data[0] != 0x17 && psf_data[1] != 0xce) {
2128                 rc = -EINVAL;
2129                 goto out_free;
2130         }
2131
2132         /* setup CCWs for PSF + RSSD */
2133         cqr = dasd_smalloc_request("ECKD", 2 , 0, device);
2134         if (IS_ERR(cqr)) {
2135                 DEV_MESSAGE(KERN_WARNING, device, "%s",
2136                         "Could not allocate initialization request");
2137                 rc = PTR_ERR(cqr);
2138                 goto out_free;
2139         }
2140
2141         cqr->startdev = device;
2142         cqr->memdev = device;
2143         cqr->retries = 3;
2144         cqr->expires = 10 * HZ;
2145         cqr->buildclk = get_clock();
2146         cqr->status = DASD_CQR_FILLED;
2147
2148         /* Build the ccws */
2149         ccw = cqr->cpaddr;
2150
2151         /* PSF ccw */
2152         ccw->cmd_code = DASD_ECKD_CCW_PSF;
2153         ccw->count = usrparm.psf_data_len;
2154         ccw->flags |= CCW_FLAG_CC;
2155         ccw->cda = (__u32)(addr_t) psf_data;
2156
2157         ccw++;
2158
2159         /* RSSD ccw  */
2160         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
2161         ccw->count = usrparm.rssd_result_len;
2162         ccw->flags = CCW_FLAG_SLI ;
2163         ccw->cda = (__u32)(addr_t) rssd_result;
2164
2165         rc = dasd_sleep_on(cqr);
2166         if (rc)
2167                 goto out_sfree;
2168
2169         rc = -EFAULT;
2170         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
2171                            rssd_result, usrparm.rssd_result_len))
2172                 goto out_sfree;
2173         rc = 0;
2174
2175 out_sfree:
2176         dasd_sfree_request(cqr, cqr->memdev);
2177 out_free:
2178         kfree(rssd_result);
2179         kfree(psf_data);
2180 out:
2181         DBF_DEV_EVENT(DBF_WARNING, device, "Symmetrix ioctl: rc=%d", rc);
2182         return rc;
2183 }
2184
2185 static int
2186 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
2187 {
2188         struct dasd_device *device = block->base;
2189
2190         switch (cmd) {
2191         case BIODASDGATTR:
2192                 return dasd_eckd_get_attrib(device, argp);
2193         case BIODASDSATTR:
2194                 return dasd_eckd_set_attrib(device, argp);
2195         case BIODASDPSRD:
2196                 return dasd_eckd_performance(device, argp);
2197         case BIODASDRLSE:
2198                 return dasd_eckd_release(device);
2199         case BIODASDRSRV:
2200                 return dasd_eckd_reserve(device);
2201         case BIODASDSLCK:
2202                 return dasd_eckd_steal_lock(device);
2203         case BIODASDSYMMIO:
2204                 return dasd_symm_io(device, argp);
2205         default:
2206                 return -ENOIOCTLCMD;
2207         }
2208 }
2209
2210 /*
2211  * Dump the range of CCWs into 'page' buffer
2212  * and return number of printed chars.
2213  */
2214 static int
2215 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
2216 {
2217         int len, count;
2218         char *datap;
2219
2220         len = 0;
2221         while (from <= to) {
2222                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2223                                " CCW %p: %08X %08X DAT:",
2224                                from, ((int *) from)[0], ((int *) from)[1]);
2225
2226                 /* get pointer to data (consider IDALs) */
2227                 if (from->flags & CCW_FLAG_IDA)
2228                         datap = (char *) *((addr_t *) (addr_t) from->cda);
2229                 else
2230                         datap = (char *) ((addr_t) from->cda);
2231
2232                 /* dump data (max 32 bytes) */
2233                 for (count = 0; count < from->count && count < 32; count++) {
2234                         if (count % 8 == 0) len += sprintf(page + len, " ");
2235                         if (count % 4 == 0) len += sprintf(page + len, " ");
2236                         len += sprintf(page + len, "%02x", datap[count]);
2237                 }
2238                 len += sprintf(page + len, "\n");
2239                 from++;
2240         }
2241         return len;
2242 }
2243
2244 /*
2245  * Print sense data and related channel program.
2246  * Parts are printed because printk buffer is only 1024 bytes.
2247  */
2248 static void dasd_eckd_dump_sense(struct dasd_device *device,
2249                                  struct dasd_ccw_req *req, struct irb *irb)
2250 {
2251         char *page;
2252         struct ccw1 *first, *last, *fail, *from, *to;
2253         int len, sl, sct;
2254
2255         page = (char *) get_zeroed_page(GFP_ATOMIC);
2256         if (page == NULL) {
2257                 DEV_MESSAGE(KERN_ERR, device, " %s",
2258                             "No memory to dump sense data");
2259                 return;
2260         }
2261         /* dump the sense data */
2262         len = sprintf(page,  KERN_ERR PRINTK_HEADER
2263                       " I/O status report for device %s:\n",
2264                       dev_name(&device->cdev->dev));
2265         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2266                        " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
2267                        irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
2268         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2269                        " device %s: Failing CCW: %p\n",
2270                        dev_name(&device->cdev->dev),
2271                        (void *) (addr_t) irb->scsw.cmd.cpa);
2272         if (irb->esw.esw0.erw.cons) {
2273                 for (sl = 0; sl < 4; sl++) {
2274                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2275                                        " Sense(hex) %2d-%2d:",
2276                                        (8 * sl), ((8 * sl) + 7));
2277
2278                         for (sct = 0; sct < 8; sct++) {
2279                                 len += sprintf(page + len, " %02x",
2280                                                irb->ecw[8 * sl + sct]);
2281                         }
2282                         len += sprintf(page + len, "\n");
2283                 }
2284
2285                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
2286                         /* 24 Byte Sense Data */
2287                         sprintf(page + len, KERN_ERR PRINTK_HEADER
2288                                 " 24 Byte: %x MSG %x, "
2289                                 "%s MSGb to SYSOP\n",
2290                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
2291                                 irb->ecw[1] & 0x10 ? "" : "no");
2292                 } else {
2293                         /* 32 Byte Sense Data */
2294                         sprintf(page + len, KERN_ERR PRINTK_HEADER
2295                                 " 32 Byte: Format: %x "
2296                                 "Exception class %x\n",
2297                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
2298                 }
2299         } else {
2300                 sprintf(page + len, KERN_ERR PRINTK_HEADER
2301                         " SORRY - NO VALID SENSE AVAILABLE\n");
2302         }
2303         printk("%s", page);
2304
2305         if (req) {
2306                 /* req == NULL for unsolicited interrupts */
2307                 /* dump the Channel Program (max 140 Bytes per line) */
2308                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
2309                 first = req->cpaddr;
2310                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
2311                 to = min(first + 6, last);
2312                 len = sprintf(page,  KERN_ERR PRINTK_HEADER
2313                               " Related CP in req: %p\n", req);
2314                 dasd_eckd_dump_ccw_range(first, to, page + len);
2315                 printk("%s", page);
2316
2317                 /* print failing CCW area (maximum 4) */
2318                 /* scsw->cda is either valid or zero  */
2319                 len = 0;
2320                 from = ++to;
2321                 fail = (struct ccw1 *)(addr_t)
2322                                 irb->scsw.cmd.cpa; /* failing CCW */
2323                 if (from <  fail - 2) {
2324                         from = fail - 2;     /* there is a gap - print header */
2325                         len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
2326                 }
2327                 to = min(fail + 1, last);
2328                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
2329
2330                 /* print last CCWs (maximum 2) */
2331                 from = max(from, ++to);
2332                 if (from < last - 1) {
2333                         from = last - 1;     /* there is a gap - print header */
2334                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
2335                 }
2336                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
2337                 if (len > 0)
2338                         printk("%s", page);
2339         }
2340         free_page((unsigned long) page);
2341 }
2342
2343 /*
2344  * max_blocks is dependent on the amount of storage that is available
2345  * in the static io buffer for each device. Currently each device has
2346  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
2347  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
2348  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
2349  * addition we have one define extent ccw + 16 bytes of data and one
2350  * locate record ccw + 16 bytes of data. That makes:
2351  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
2352  * We want to fit two into the available memory so that we can immediately
2353  * start the next request if one finishes off. That makes 249.5 blocks
2354  * for one request. Give a little safety and the result is 240.
2355  */
2356 static struct dasd_discipline dasd_eckd_discipline = {
2357         .owner = THIS_MODULE,
2358         .name = "ECKD",
2359         .ebcname = "ECKD",
2360         .max_blocks = 240,
2361         .check_device = dasd_eckd_check_characteristics,
2362         .uncheck_device = dasd_eckd_uncheck_device,
2363         .do_analysis = dasd_eckd_do_analysis,
2364         .ready_to_online = dasd_eckd_ready_to_online,
2365         .online_to_ready = dasd_eckd_online_to_ready,
2366         .fill_geometry = dasd_eckd_fill_geometry,
2367         .start_IO = dasd_start_IO,
2368         .term_IO = dasd_term_IO,
2369         .handle_terminated_request = dasd_eckd_handle_terminated_request,
2370         .format_device = dasd_eckd_format_device,
2371         .erp_action = dasd_eckd_erp_action,
2372         .erp_postaction = dasd_eckd_erp_postaction,
2373         .handle_unsolicited_interrupt = dasd_eckd_handle_unsolicited_interrupt,
2374         .build_cp = dasd_eckd_build_alias_cp,
2375         .free_cp = dasd_eckd_free_alias_cp,
2376         .dump_sense = dasd_eckd_dump_sense,
2377         .fill_info = dasd_eckd_fill_info,
2378         .ioctl = dasd_eckd_ioctl,
2379 };
2380
2381 static int __init
2382 dasd_eckd_init(void)
2383 {
2384         ASCEBC(dasd_eckd_discipline.ebcname, 4);
2385         return ccw_driver_register(&dasd_eckd_driver);
2386 }
2387
2388 static void __exit
2389 dasd_eckd_cleanup(void)
2390 {
2391         ccw_driver_unregister(&dasd_eckd_driver);
2392 }
2393
2394 module_init(dasd_eckd_init);
2395 module_exit(dasd_eckd_cleanup);