drivers/s390/block/dasd_eckd.c

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_eckd.c
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5  *                  Carsten Otte <Cotte@de.ibm.com>
   6  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  * Bugreports.to..: <Linux390@de.ibm.com>
   8  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
   9  *
  10  * $Revision: 1.69 $
  11  */
  12
  13 #include <linux/config.h>
  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/ccwdev.h>
  29
  30 #include "dasd_int.h"
  31 #include "dasd_eckd.h"
  32
  33 #ifdef PRINTK_HEADER
  34 #undef PRINTK_HEADER
  35 #endif                          /* PRINTK_HEADER */
  36 #define PRINTK_HEADER "dasd(eckd):"
  37
  38 #define ECKD_C0(i) (i->home_bytes)
  39 #define ECKD_F(i) (i->formula)
  40 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
  41                     (i->factors.f_0x02.f1))
  42 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
  43                     (i->factors.f_0x02.f2))
  44 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
  45                     (i->factors.f_0x02.f3))
  46 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
  47 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
  48 #define ECKD_F6(i) (i->factor6)
  49 #define ECKD_F7(i) (i->factor7)
  50 #define ECKD_F8(i) (i->factor8)
  51
  52 MODULE_LICENSE("GPL");
  53
  54 static struct dasd_discipline dasd_eckd_discipline;
  55
  56 struct dasd_eckd_private {
  57         struct dasd_eckd_characteristics rdc_data;
  58         struct dasd_eckd_confdata conf_data;
  59         struct dasd_eckd_path path_data;
  60         struct eckd_count count_area[5];
  61         int init_cqr_status;
  62         int uses_cdl;
  63         struct attrib_data_t attrib;    /* e.g. cache operations */
  64 };
  65
  66 /* The ccw bus type uses this table to find devices that it sends to
  67  * dasd_eckd_probe */
  68 static struct ccw_device_id dasd_eckd_ids[] = {
  69         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), driver_info: 0x1},
  70         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), driver_info: 0x2},
  71         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3390, 0), driver_info: 0x3},
  72         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), driver_info: 0x4},
  73         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), driver_info: 0x5},
  74         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), driver_info: 0x6},
  75         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), driver_info: 0x7},
  76         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), driver_info: 0x8},
  77         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), driver_info: 0x9},
  78         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), driver_info: 0xa},
  79         { /* end of list */ },
  80 };
  81
  82 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  83
  84 static struct ccw_driver dasd_eckd_driver; /* see below */
  85
  86 /* initial attempt at a probe function. this can be simplified once
  87  * the other detection code is gone */
  88 static int
  89 dasd_eckd_probe (struct ccw_device *cdev)
  90 {
  91         int ret;
  92
  93         ret = dasd_generic_probe (cdev, &dasd_eckd_discipline);
  94         if (ret)
  95                 return ret;
  96         ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP | CCWDEV_ALLOW_FORCE);
  97         return 0;
  98 }
  99
 100 static int
 101 dasd_eckd_set_online(struct ccw_device *cdev)
 102 {
 103         return dasd_generic_set_online (cdev, &dasd_eckd_discipline);
 104 }
 105
 106 static struct ccw_driver dasd_eckd_driver = {
 107         .name        = "dasd-eckd",
 108         .owner       = THIS_MODULE,
 109         .ids         = dasd_eckd_ids,
 110         .probe       = dasd_eckd_probe,
 111         .remove      = dasd_generic_remove,
 112         .set_offline = dasd_generic_set_offline,
 113         .set_online  = dasd_eckd_set_online,
 114         .notify      = dasd_generic_notify,
 115 };
 116
 117 static const int sizes_trk0[] = { 28, 148, 84 };
 118 #define LABEL_SIZE 140
 119
 120 static inline unsigned int
 121 round_up_multiple(unsigned int no, unsigned int mult)
 122 {
 123         int rem = no % mult;
 124         return (rem ? no - rem + mult : no);
 125 }
 126
 127 static inline unsigned int
 128 ceil_quot(unsigned int d1, unsigned int d2)
 129 {
 130         return (d1 + (d2 - 1)) / d2;
 131 }
 132
 133 static inline int
 134 bytes_per_record(struct dasd_eckd_characteristics *rdc, int kl, int dl)
 135 {
 136         unsigned int fl1, fl2, int1, int2;
 137         int bpr;
 138
 139         switch (rdc->formula) {
 140         case 0x01:
 141                 fl1 = round_up_multiple(ECKD_F2(rdc) + dl, ECKD_F1(rdc));
 142                 fl2 = round_up_multiple(kl ? ECKD_F2(rdc) + kl : 0,
 143                                         ECKD_F1(rdc));
 144                 bpr = fl1 + fl2;
 145                 break;
 146         case 0x02:
 147                 int1 = ceil_quot(dl + ECKD_F6(rdc), ECKD_F5(rdc) << 1);
 148                 int2 = ceil_quot(kl + ECKD_F6(rdc), ECKD_F5(rdc) << 1);
 149                 fl1 = round_up_multiple(ECKD_F1(rdc) * ECKD_F2(rdc) + dl +
 150                                         ECKD_F6(rdc) + ECKD_F4(rdc) * int1,
 151                                         ECKD_F1(rdc));
 152                 fl2 = round_up_multiple(ECKD_F1(rdc) * ECKD_F3(rdc) + kl +
 153                                         ECKD_F6(rdc) + ECKD_F4(rdc) * int2,
 154                                         ECKD_F1(rdc));
 155                 bpr = fl1 + fl2;
 156                 break;
 157         default:
 158                 bpr = 0;
 159                 break;
 160         }
 161         return bpr;
 162 }
 163
 164 static inline unsigned int
 165 bytes_per_track(struct dasd_eckd_characteristics *rdc)
 166 {
 167         return *(unsigned int *) (rdc->byte_per_track) >> 8;
 168 }
 169
 170 static inline unsigned int
 171 recs_per_track(struct dasd_eckd_characteristics * rdc,
 172                unsigned int kl, unsigned int dl)
 173 {
 174         int dn, kn;
 175
 176         switch (rdc->dev_type) {
 177         case 0x3380:
 178                 if (kl)
 179                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 180                                        ceil_quot(dl + 12, 32));
 181                 else
 182                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 183         case 0x3390:
 184                 dn = ceil_quot(dl + 6, 232) + 1;
 185                 if (kl) {
 186                         kn = ceil_quot(kl + 6, 232) + 1;
 187                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 188                                        9 + ceil_quot(dl + 6 * dn, 34));
 189                 } else
 190                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 191         case 0x9345:
 192                 dn = ceil_quot(dl + 6, 232) + 1;
 193                 if (kl) {
 194                         kn = ceil_quot(kl + 6, 232) + 1;
 195                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 196                                        ceil_quot(dl + 6 * dn, 34));
 197                 } else
 198                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 199         }
 200         return 0;
 201 }
 202
 203 static inline void
 204 check_XRC (struct ccw1         *de_ccw,
 205            struct DE_eckd_data *data,
 206            struct dasd_device  *device)
 207 {
 208         struct dasd_eckd_private *private;
 209
 210         private = (struct dasd_eckd_private *) device->private;
 211
 212         /* switch on System Time Stamp - needed for XRC Support */
 213         if (private->rdc_data.facilities.XRC_supported) {
 214
 215                 data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 216                 data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 217
 218                 data->ep_sys_time = get_clock ();
 219
 220                 de_ccw->count = sizeof (struct DE_eckd_data);
 221                 de_ccw->flags |= CCW_FLAG_SLI;
 222         }
 223
 224         return;
 225
 226 } /* end check_XRC */
 227
 228 static inline void
 229 define_extent(struct ccw1 * ccw, struct DE_eckd_data * data, int trk,
 230               int totrk, int cmd, struct dasd_device * device)
 231 {
 232         struct dasd_eckd_private *private;
 233         struct ch_t geo, beg, end;
 234
 235         private = (struct dasd_eckd_private *) device->private;
 236
 237         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 238         ccw->flags = 0;
 239         ccw->count = 16;
 240         ccw->cda = (__u32) __pa(data);
 241
 242         memset(data, 0, sizeof (struct DE_eckd_data));
 243         switch (cmd) {
 244         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 245         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 246         case DASD_ECKD_CCW_READ:
 247         case DASD_ECKD_CCW_READ_MT:
 248         case DASD_ECKD_CCW_READ_CKD:
 249         case DASD_ECKD_CCW_READ_CKD_MT:
 250         case DASD_ECKD_CCW_READ_KD:
 251         case DASD_ECKD_CCW_READ_KD_MT:
 252         case DASD_ECKD_CCW_READ_COUNT:
 253                 data->mask.perm = 0x1;
 254                 data->attributes.operation = private->attrib.operation;
 255                 break;
 256         case DASD_ECKD_CCW_WRITE:
 257         case DASD_ECKD_CCW_WRITE_MT:
 258         case DASD_ECKD_CCW_WRITE_KD:
 259         case DASD_ECKD_CCW_WRITE_KD_MT:
 260                 data->mask.perm = 0x02;
 261                 data->attributes.operation = private->attrib.operation;
 262                 check_XRC (ccw, data, device);
 263                 break;
 264         case DASD_ECKD_CCW_WRITE_CKD:
 265         case DASD_ECKD_CCW_WRITE_CKD_MT:
 266                 data->attributes.operation = DASD_BYPASS_CACHE;
 267                 check_XRC (ccw, data, device);
 268                 break;
 269         case DASD_ECKD_CCW_ERASE:
 270         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 271         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 272                 data->mask.perm = 0x3;
 273                 data->mask.auth = 0x1;
 274                 data->attributes.operation = DASD_BYPASS_CACHE;
 275                 check_XRC (ccw, data, device);
 276                 break;
 277         default:
 278                 DEV_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", cmd);
 279                 break;
 280         }
 281
 282         data->attributes.mode = 0x3;    /* ECKD */
 283
 284         if ((private->rdc_data.cu_type == 0x2105 ||
 285              private->rdc_data.cu_type == 0x2107 ||
 286              private->rdc_data.cu_type == 0x1750)
 287             && !(private->uses_cdl && trk < 2))
 288                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 289
 290         geo.cyl = private->rdc_data.no_cyl;
 291         geo.head = private->rdc_data.trk_per_cyl;
 292         beg.cyl = trk / geo.head;
 293         beg.head = trk % geo.head;
 294         end.cyl = totrk / geo.head;
 295         end.head = totrk % geo.head;
 296
 297         /* check for sequential prestage - enhance cylinder range */
 298         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 299             data->attributes.operation == DASD_SEQ_ACCESS) {
 300
 301                 if (end.cyl + private->attrib.nr_cyl < geo.cyl)
 302                         end.cyl += private->attrib.nr_cyl;
 303                 else
 304                         end.cyl = (geo.cyl - 1);
 305         }
 306
 307         data->beg_ext.cyl = beg.cyl;
 308         data->beg_ext.head = beg.head;
 309         data->end_ext.cyl = end.cyl;
 310         data->end_ext.head = end.head;
 311 }
 312
 313 static inline void
 314 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, int trk,
 315               int rec_on_trk, int no_rec, int cmd,
 316               struct dasd_device * device, int reclen)
 317 {
 318         struct dasd_eckd_private *private;
 319         int sector;
 320         int dn, d;
 321
 322         private = (struct dasd_eckd_private *) device->private;
 323
 324         DBF_DEV_EVENT(DBF_INFO, device,
 325                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 326                   trk, rec_on_trk, no_rec, cmd, reclen);
 327
 328         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 329         ccw->flags = 0;
 330         ccw->count = 16;
 331         ccw->cda = (__u32) __pa(data);
 332
 333         memset(data, 0, sizeof (struct LO_eckd_data));
 334         sector = 0;
 335         if (rec_on_trk) {
 336                 switch (private->rdc_data.dev_type) {
 337                 case 0x3390:
 338                         dn = ceil_quot(reclen + 6, 232);
 339                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 340                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 341                         break;
 342                 case 0x3380:
 343                         d = 7 + ceil_quot(reclen + 12, 32);
 344                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 345                         break;
 346                 }
 347         }
 348         data->sector = sector;
 349         data->count = no_rec;
 350         switch (cmd) {
 351         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 352                 data->operation.orientation = 0x3;
 353                 data->operation.operation = 0x03;
 354                 break;
 355         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 356                 data->operation.orientation = 0x3;
 357                 data->operation.operation = 0x16;
 358                 break;
 359         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 360                 data->operation.orientation = 0x1;
 361                 data->operation.operation = 0x03;
 362                 data->count++;
 363                 break;
 364         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 365                 data->operation.orientation = 0x3;
 366                 data->operation.operation = 0x16;
 367                 data->count++;
 368                 break;
 369         case DASD_ECKD_CCW_WRITE:
 370         case DASD_ECKD_CCW_WRITE_MT:
 371         case DASD_ECKD_CCW_WRITE_KD:
 372         case DASD_ECKD_CCW_WRITE_KD_MT:
 373                 data->auxiliary.last_bytes_used = 0x1;
 374                 data->length = reclen;
 375                 data->operation.operation = 0x01;
 376                 break;
 377         case DASD_ECKD_CCW_WRITE_CKD:
 378         case DASD_ECKD_CCW_WRITE_CKD_MT:
 379                 data->auxiliary.last_bytes_used = 0x1;
 380                 data->length = reclen;
 381                 data->operation.operation = 0x03;
 382                 break;
 383         case DASD_ECKD_CCW_READ:
 384         case DASD_ECKD_CCW_READ_MT:
 385         case DASD_ECKD_CCW_READ_KD:
 386         case DASD_ECKD_CCW_READ_KD_MT:
 387                 data->auxiliary.last_bytes_used = 0x1;
 388                 data->length = reclen;
 389                 data->operation.operation = 0x06;
 390                 break;
 391         case DASD_ECKD_CCW_READ_CKD:
 392         case DASD_ECKD_CCW_READ_CKD_MT:
 393                 data->auxiliary.last_bytes_used = 0x1;
 394                 data->length = reclen;
 395                 data->operation.operation = 0x16;
 396                 break;
 397         case DASD_ECKD_CCW_READ_COUNT:
 398                 data->operation.operation = 0x06;
 399                 break;
 400         case DASD_ECKD_CCW_ERASE:
 401                 data->length = reclen;
 402                 data->auxiliary.last_bytes_used = 0x1;
 403                 data->operation.operation = 0x0b;
 404                 break;
 405         default:
 406                 DEV_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", cmd);
 407         }
 408         data->seek_addr.cyl = data->search_arg.cyl =
 409                 trk / private->rdc_data.trk_per_cyl;
 410         data->seek_addr.head = data->search_arg.head =
 411                 trk % private->rdc_data.trk_per_cyl;
 412         data->search_arg.record = rec_on_trk;
 413 }
 414
 415 /*
 416  * Returns 1 if the block is one of the special blocks that needs
 417  * to get read/written with the KD variant of the command.
 418  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 419  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 420  * Luckily the KD variants differ only by one bit (0x08) from the
 421  * normal variant. So don't wonder about code like:
 422  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 423  *         ccw->cmd_code |= 0x8;
 424  */
 425 static inline int
 426 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 427 {
 428         if (recid < 3)
 429                 return 1;
 430         if (recid < blk_per_trk)
 431                 return 0;
 432         if (recid < 2 * blk_per_trk)
 433                 return 1;
 434         return 0;
 435 }
 436
 437 /*
 438  * Returns the record size for the special blocks of the cdl format.
 439  * Only returns something useful if dasd_eckd_cdl_special is true
 440  * for the recid.
 441  */
 442 static inline int
 443 dasd_eckd_cdl_reclen(int recid)
 444 {
 445         if (recid < 3)
 446                 return sizes_trk0[recid];
 447         return LABEL_SIZE;
 448 }
 449
 450 static int
 451 dasd_eckd_read_conf(struct dasd_device *device)
 452 {
 453         void *conf_data;
 454         int conf_len, conf_data_saved;
 455         int rc;
 456         __u8 lpm;
 457         struct dasd_eckd_private *private;
 458         struct dasd_eckd_path *path_data;
 459
 460         private = (struct dasd_eckd_private *) device->private;
 461         path_data = (struct dasd_eckd_path *) &private->path_data;
 462         path_data->opm = ccw_device_get_path_mask(device->cdev);
 463         lpm = 0x80;
 464         conf_data_saved = 0;
 465
 466         /* get configuration data per operational path */
 467         for (lpm = 0x80; lpm; lpm>>= 1) {
 468                 if (lpm & path_data->opm){
 469                         rc = read_conf_data_lpm(device->cdev, &conf_data,
 470                                                 &conf_len, lpm);
 471                         if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
 472                                 MESSAGE(KERN_WARNING,
 473                                         "Read configuration data returned "
 474                                         "error %d", rc);
 475                                 return rc;
 476                         }
 477                         if (conf_data == NULL) {
 478                                 MESSAGE(KERN_WARNING, "%s", "No configuration "
 479                                         "data retrieved");
 480                                 continue;       /* no errror */
 481                         }
 482                         if (conf_len != sizeof (struct dasd_eckd_confdata)) {
 483                                 MESSAGE(KERN_WARNING,
 484                                         "sizes of configuration data mismatch"
 485                                         "%d (read) vs %ld (expected)",
 486                                         conf_len,
 487                                         sizeof (struct dasd_eckd_confdata));
 488                                 kfree(conf_data);
 489                                 continue;       /* no errror */
 490                         }
 491                         /* save first valid configuration data */
 492                         if (!conf_data_saved){
 493                                 memcpy(&private->conf_data, conf_data,
 494                                        sizeof (struct dasd_eckd_confdata));
 495                                 conf_data_saved++;
 496                         }
 497                         switch (((char *)conf_data)[242] & 0x07){
 498                         case 0x02:
 499                                 path_data->npm |= lpm;
 500                                 break;
 501                         case 0x03:
 502                                 path_data->ppm |= lpm;
 503                                 break;
 504                         }
 505                         kfree(conf_data);
 506                 }
 507         }
 508         return 0;
 509 }
 510
 511
 512 static int
 513 dasd_eckd_check_characteristics(struct dasd_device *device)
 514 {
 515         struct dasd_eckd_private *private;
 516         void *rdc_data;
 517         int rc;
 518
 519         private = (struct dasd_eckd_private *) device->private;
 520         if (private == NULL) {
 521                 private = kmalloc(sizeof(struct dasd_eckd_private),
 522                                   GFP_KERNEL | GFP_DMA);
 523                 if (private == NULL) {
 524                         DEV_MESSAGE(KERN_WARNING, device, "%s",
 525                                     "memory allocation failed for private "
 526                                     "data");
 527                         return -ENOMEM;
 528                 }
 529                 memset(private, 0, sizeof(struct dasd_eckd_private));
 530                 device->private = (void *) private;
 531         }
 532         /* Invalidate status of initial analysis. */
 533         private->init_cqr_status = -1;
 534         /* Set default cache operations. */
 535         private->attrib.operation = DASD_NORMAL_CACHE;
 536         private->attrib.nr_cyl = 0;
 537
 538         /* Read Device Characteristics */
 539         rdc_data = (void *) &(private->rdc_data);
 540         rc = read_dev_chars(device->cdev, &rdc_data, 64);
 541         if (rc) {
 542                 DEV_MESSAGE(KERN_WARNING, device,
 543                             "Read device characteristics returned error %d",
 544                             rc);
 545                 return rc;
 546         }
 547
 548         DEV_MESSAGE(KERN_INFO, device,
 549                     "%04X/%02X(CU:%04X/%02X) Cyl:%d Head:%d Sec:%d",
 550                     private->rdc_data.dev_type,
 551                     private->rdc_data.dev_model,
 552                     private->rdc_data.cu_type,
 553                     private->rdc_data.cu_model.model,
 554                     private->rdc_data.no_cyl,
 555                     private->rdc_data.trk_per_cyl,
 556                     private->rdc_data.sec_per_trk);
 557
 558         /* Read Configuration Data */
 559         rc = dasd_eckd_read_conf (device);
 560         return rc;
 561
 562 }
 563
 564 static struct dasd_ccw_req *
 565 dasd_eckd_analysis_ccw(struct dasd_device *device)
 566 {
 567         struct dasd_eckd_private *private;
 568         struct eckd_count *count_data;
 569         struct LO_eckd_data *LO_data;
 570         struct dasd_ccw_req *cqr;
 571         struct ccw1 *ccw;
 572         int cplength, datasize;
 573         int i;
 574
 575         private = (struct dasd_eckd_private *) device->private;
 576
 577         cplength = 8;
 578         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
 579         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
 580                                    cplength, datasize, device);
 581         if (IS_ERR(cqr))
 582                 return cqr;
 583         ccw = cqr->cpaddr;
 584         /* Define extent for the first 3 tracks. */
 585         define_extent(ccw++, cqr->data, 0, 2,
 586                       DASD_ECKD_CCW_READ_COUNT, device);
 587         LO_data = cqr->data + sizeof (struct DE_eckd_data);
 588         /* Locate record for the first 4 records on track 0. */
 589         ccw[-1].flags |= CCW_FLAG_CC;
 590         locate_record(ccw++, LO_data++, 0, 0, 4,
 591                       DASD_ECKD_CCW_READ_COUNT, device, 0);
 592
 593         count_data = private->count_area;
 594         for (i = 0; i < 4; i++) {
 595                 ccw[-1].flags |= CCW_FLAG_CC;
 596                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
 597                 ccw->flags = 0;
 598                 ccw->count = 8;
 599                 ccw->cda = (__u32)(addr_t) count_data;
 600                 ccw++;
 601                 count_data++;
 602         }
 603
 604         /* Locate record for the first record on track 2. */
 605         ccw[-1].flags |= CCW_FLAG_CC;
 606         locate_record(ccw++, LO_data++, 2, 0, 1,
 607                       DASD_ECKD_CCW_READ_COUNT, device, 0);
 608         /* Read count ccw. */
 609         ccw[-1].flags |= CCW_FLAG_CC;
 610         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
 611         ccw->flags = 0;
 612         ccw->count = 8;
 613         ccw->cda = (__u32)(addr_t) count_data;
 614
 615         cqr->device = device;
 616         cqr->retries = 0;
 617         cqr->buildclk = get_clock();
 618         cqr->status = DASD_CQR_FILLED;
 619         return cqr;
 620 }
 621
 622 /*
 623  * This is the callback function for the init_analysis cqr. It saves
 624  * the status of the initial analysis ccw before it frees it and kicks
 625  * the device to continue the startup sequence. This will call
 626  * dasd_eckd_do_analysis again (if the devices has not been marked
 627  * for deletion in the meantime).
 628  */
 629 static void
 630 dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, void *data)
 631 {
 632         struct dasd_eckd_private *private;
 633         struct dasd_device *device;
 634
 635         device = init_cqr->device;
 636         private = (struct dasd_eckd_private *) device->private;
 637         private->init_cqr_status = init_cqr->status;
 638         dasd_sfree_request(init_cqr, device);
 639         dasd_kick_device(device);
 640 }
 641
 642 static int
 643 dasd_eckd_start_analysis(struct dasd_device *device)
 644 {
 645         struct dasd_eckd_private *private;
 646         struct dasd_ccw_req *init_cqr;
 647
 648         private = (struct dasd_eckd_private *) device->private;
 649         init_cqr = dasd_eckd_analysis_ccw(device);
 650         if (IS_ERR(init_cqr))
 651                 return PTR_ERR(init_cqr);
 652         init_cqr->callback = dasd_eckd_analysis_callback;
 653         init_cqr->callback_data = NULL;
 654         init_cqr->expires = 5*HZ;
 655         dasd_add_request_head(init_cqr);
 656         return -EAGAIN;
 657 }
 658
 659 static int
 660 dasd_eckd_end_analysis(struct dasd_device *device)
 661 {
 662         struct dasd_eckd_private *private;
 663         struct eckd_count *count_area;
 664         unsigned int sb, blk_per_trk;
 665         int status, i;
 666
 667         private = (struct dasd_eckd_private *) device->private;
 668         status = private->init_cqr_status;
 669         private->init_cqr_status = -1;
 670         if (status != DASD_CQR_DONE) {
 671                 DEV_MESSAGE(KERN_WARNING, device, "%s",
 672                             "volume analysis returned unformatted disk");
 673                 return -EMEDIUMTYPE;
 674         }
 675
 676         private->uses_cdl = 1;
 677         /* Calculate number of blocks/records per track. */
 678         blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block);
 679         /* Check Track 0 for Compatible Disk Layout */
 680         count_area = NULL;
 681         for (i = 0; i < 3; i++) {
 682                 if (private->count_area[i].kl != 4 ||
 683                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
 684                         private->uses_cdl = 0;
 685                         break;
 686                 }
 687         }
 688         if (i == 3)
 689                 count_area = &private->count_area[4];
 690
 691         if (private->uses_cdl == 0) {
 692                 for (i = 0; i < 5; i++) {
 693                         if ((private->count_area[i].kl != 0) ||
 694                             (private->count_area[i].dl !=
 695                              private->count_area[0].dl))
 696                                 break;
 697                 }
 698                 if (i == 5)
 699                         count_area = &private->count_area[0];
 700         } else {
 701                 if (private->count_area[3].record == 1)
 702                         DEV_MESSAGE(KERN_WARNING, device, "%s",
 703                                     "Trk 0: no records after VTOC!");
 704         }
 705         if (count_area != NULL && count_area->kl == 0) {
 706                 /* we found notthing violating our disk layout */
 707                 if (dasd_check_blocksize(count_area->dl) == 0)
 708                         device->bp_block = count_area->dl;
 709         }
 710         if (device->bp_block == 0) {
 711                 DEV_MESSAGE(KERN_WARNING, device, "%s",
 712                             "Volume has incompatible disk layout");
 713                 return -EMEDIUMTYPE;
 714         }
 715         device->s2b_shift = 0;  /* bits to shift 512 to get a block */
 716         for (sb = 512; sb < device->bp_block; sb = sb << 1)
 717                 device->s2b_shift++;
 718
 719         blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block);
 720         device->blocks = (private->rdc_data.no_cyl *
 721                           private->rdc_data.trk_per_cyl *
 722                           blk_per_trk);
 723
 724         DEV_MESSAGE(KERN_INFO, device,
 725                     "(%dkB blks): %dkB at %dkB/trk %s",
 726                     (device->bp_block >> 10),
 727                     ((private->rdc_data.no_cyl *
 728                       private->rdc_data.trk_per_cyl *
 729                       blk_per_trk * (device->bp_block >> 9)) >> 1),
 730                     ((blk_per_trk * device->bp_block) >> 10),
 731                     private->uses_cdl ?
 732                     "compatible disk layout" : "linux disk layout");
 733
 734         return 0;
 735 }
 736
 737 static int
 738 dasd_eckd_do_analysis(struct dasd_device *device)
 739 {
 740         struct dasd_eckd_private *private;
 741
 742         private = (struct dasd_eckd_private *) device->private;
 743         if (private->init_cqr_status < 0)
 744                 return dasd_eckd_start_analysis(device);
 745         else
 746                 return dasd_eckd_end_analysis(device);
 747 }
 748
 749 static int
 750 dasd_eckd_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
 751 {
 752         struct dasd_eckd_private *private;
 753
 754         private = (struct dasd_eckd_private *) device->private;
 755         if (dasd_check_blocksize(device->bp_block) == 0) {
 756                 geo->sectors = recs_per_track(&private->rdc_data,
 757                                               0, device->bp_block);
 758         }
 759         geo->cylinders = private->rdc_data.no_cyl;
 760         geo->heads = private->rdc_data.trk_per_cyl;
 761         return 0;
 762 }
 763
 764 static struct dasd_ccw_req *
 765 dasd_eckd_format_device(struct dasd_device * device,
 766                         struct format_data_t * fdata)
 767 {
 768         struct dasd_eckd_private *private;
 769         struct dasd_ccw_req *fcp;
 770         struct eckd_count *ect;
 771         struct ccw1 *ccw;
 772         void *data;
 773         int rpt, cyl, head;
 774         int cplength, datasize;
 775         int i;
 776
 777         private = (struct dasd_eckd_private *) device->private;
 778         rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
 779         cyl = fdata->start_unit / private->rdc_data.trk_per_cyl;
 780         head = fdata->start_unit % private->rdc_data.trk_per_cyl;
 781
 782         /* Sanity checks. */
 783         if (fdata->start_unit >=
 784             (private->rdc_data.no_cyl * private->rdc_data.trk_per_cyl)) {
 785                 DEV_MESSAGE(KERN_INFO, device, "Track no %d too big!",
 786                             fdata->start_unit);
 787                 return ERR_PTR(-EINVAL);
 788         }
 789         if (fdata->start_unit > fdata->stop_unit) {
 790                 DEV_MESSAGE(KERN_INFO, device, "Track %d reached! ending.",
 791                             fdata->start_unit);
 792                 return ERR_PTR(-EINVAL);
 793         }
 794         if (dasd_check_blocksize(fdata->blksize) != 0) {
 795                 DEV_MESSAGE(KERN_WARNING, device,
 796                             "Invalid blocksize %d...terminating!",
 797                             fdata->blksize);
 798                 return ERR_PTR(-EINVAL);
 799         }
 800
 801         /*
 802          * fdata->intensity is a bit string that tells us what to do:
 803          *   Bit 0: write record zero
 804          *   Bit 1: write home address, currently not supported
 805          *   Bit 2: invalidate tracks
 806          *   Bit 3: use OS/390 compatible disk layout (cdl)
 807          * Only some bit combinations do make sense.
 808          */
 809         switch (fdata->intensity) {
 810         case 0x00:      /* Normal format */
 811         case 0x08:      /* Normal format, use cdl. */
 812                 cplength = 2 + rpt;
 813                 datasize = sizeof(struct DE_eckd_data) +
 814                         sizeof(struct LO_eckd_data) +
 815                         rpt * sizeof(struct eckd_count);
 816                 break;
 817         case 0x01:      /* Write record zero and format track. */
 818         case 0x09:      /* Write record zero and format track, use cdl. */
 819                 cplength = 3 + rpt;
 820                 datasize = sizeof(struct DE_eckd_data) +
 821                         sizeof(struct LO_eckd_data) +
 822                         sizeof(struct eckd_count) +
 823                         rpt * sizeof(struct eckd_count);
 824                 break;
 825         case 0x04:      /* Invalidate track. */
 826         case 0x0c:      /* Invalidate track, use cdl. */
 827                 cplength = 3;
 828                 datasize = sizeof(struct DE_eckd_data) +
 829                         sizeof(struct LO_eckd_data) +
 830                         sizeof(struct eckd_count);
 831                 break;
 832         default:
 833                 DEV_MESSAGE(KERN_WARNING, device, "Invalid flags 0x%x.",
 834                             fdata->intensity);
 835                 return ERR_PTR(-EINVAL);
 836         }
 837         /* Allocate the format ccw request. */
 838         fcp = dasd_smalloc_request(dasd_eckd_discipline.name,
 839                                    cplength, datasize, device);
 840         if (IS_ERR(fcp))
 841                 return fcp;
 842
 843         data = fcp->data;
 844         ccw = fcp->cpaddr;
 845
 846         switch (fdata->intensity & ~0x08) {
 847         case 0x00: /* Normal format. */
 848                 define_extent(ccw++, (struct DE_eckd_data *) data,
 849                               fdata->start_unit, fdata->start_unit,
 850                               DASD_ECKD_CCW_WRITE_CKD, device);
 851                 data += sizeof(struct DE_eckd_data);
 852                 ccw[-1].flags |= CCW_FLAG_CC;
 853                 locate_record(ccw++, (struct LO_eckd_data *) data,
 854                               fdata->start_unit, 0, rpt,
 855                               DASD_ECKD_CCW_WRITE_CKD, device,
 856                               fdata->blksize);
 857                 data += sizeof(struct LO_eckd_data);
 858                 break;
 859         case 0x01: /* Write record zero + format track. */
 860                 define_extent(ccw++, (struct DE_eckd_data *) data,
 861                               fdata->start_unit, fdata->start_unit,
 862                               DASD_ECKD_CCW_WRITE_RECORD_ZERO,
 863                               device);
 864                 data += sizeof(struct DE_eckd_data);
 865                 ccw[-1].flags |= CCW_FLAG_CC;
 866                 locate_record(ccw++, (struct LO_eckd_data *) data,
 867                               fdata->start_unit, 0, rpt + 1,
 868                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
 869                               device->bp_block);
 870                 data += sizeof(struct LO_eckd_data);
 871                 break;
 872         case 0x04: /* Invalidate track. */
 873                 define_extent(ccw++, (struct DE_eckd_data *) data,
 874                               fdata->start_unit, fdata->start_unit,
 875                               DASD_ECKD_CCW_WRITE_CKD, device);
 876                 data += sizeof(struct DE_eckd_data);
 877                 ccw[-1].flags |= CCW_FLAG_CC;
 878                 locate_record(ccw++, (struct LO_eckd_data *) data,
 879                               fdata->start_unit, 0, 1,
 880                               DASD_ECKD_CCW_WRITE_CKD, device, 8);
 881                 data += sizeof(struct LO_eckd_data);
 882                 break;
 883         }
 884         if (fdata->intensity & 0x01) {  /* write record zero */
 885                 ect = (struct eckd_count *) data;
 886                 data += sizeof(struct eckd_count);
 887                 ect->cyl = cyl;
 888                 ect->head = head;
 889                 ect->record = 0;
 890                 ect->kl = 0;
 891                 ect->dl = 8;
 892                 ccw[-1].flags |= CCW_FLAG_CC;
 893                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
 894                 ccw->flags = CCW_FLAG_SLI;
 895                 ccw->count = 8;
 896                 ccw->cda = (__u32)(addr_t) ect;
 897                 ccw++;
 898         }
 899         if ((fdata->intensity & ~0x08) & 0x04) {        /* erase track */
 900                 ect = (struct eckd_count *) data;
 901                 data += sizeof(struct eckd_count);
 902                 ect->cyl = cyl;
 903                 ect->head = head;
 904                 ect->record = 1;
 905                 ect->kl = 0;
 906                 ect->dl = 0;
 907                 ccw[-1].flags |= CCW_FLAG_CC;
 908                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
 909                 ccw->flags = CCW_FLAG_SLI;
 910                 ccw->count = 8;
 911                 ccw->cda = (__u32)(addr_t) ect;
 912         } else {                /* write remaining records */
 913                 for (i = 0; i < rpt; i++) {
 914                         ect = (struct eckd_count *) data;
 915                         data += sizeof(struct eckd_count);
 916                         ect->cyl = cyl;
 917                         ect->head = head;
 918                         ect->record = i + 1;
 919                         ect->kl = 0;
 920                         ect->dl = fdata->blksize;
 921                         /* Check for special tracks 0-1 when formatting CDL */
 922                         if ((fdata->intensity & 0x08) &&
 923                             fdata->start_unit == 0) {
 924                                 if (i < 3) {
 925                                         ect->kl = 4;
 926                                         ect->dl = sizes_trk0[i] - 4;
 927                                 }
 928                         }
 929                         if ((fdata->intensity & 0x08) &&
 930                             fdata->start_unit == 1) {
 931                                 ect->kl = 44;
 932                                 ect->dl = LABEL_SIZE - 44;
 933                         }
 934                         ccw[-1].flags |= CCW_FLAG_CC;
 935                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
 936                         ccw->flags = CCW_FLAG_SLI;
 937                         ccw->count = 8;
 938                         ccw->cda = (__u32)(addr_t) ect;
 939                         ccw++;
 940                 }
 941         }
 942         fcp->device = device;
 943         fcp->retries = 2;       /* set retry counter to enable ERP */
 944         fcp->buildclk = get_clock();
 945         fcp->status = DASD_CQR_FILLED;
 946         return fcp;
 947 }
 948
 949 static dasd_era_t
 950 dasd_eckd_examine_error(struct dasd_ccw_req * cqr, struct irb * irb)
 951 {
 952         struct dasd_device *device = (struct dasd_device *) cqr->device;
 953         struct ccw_device *cdev = device->cdev;
 954
 955         if (irb->scsw.cstat == 0x00 &&
 956             irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
 957                 return dasd_era_none;
 958
 959         switch (cdev->id.cu_type) {
 960         case 0x3990:
 961         case 0x2105:
 962         case 0x2107:
 963         case 0x1750:
 964                 return dasd_3990_erp_examine(cqr, irb);
 965         case 0x9343:
 966                 return dasd_9343_erp_examine(cqr, irb);
 967         case 0x3880:
 968         default:
 969                 DEV_MESSAGE(KERN_WARNING, device, "%s",
 970                             "default (unknown CU type) - RECOVERABLE return");
 971                 return dasd_era_recover;
 972         }
 973 }
 974
 975 static dasd_erp_fn_t
 976 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
 977 {
 978         struct dasd_device *device = (struct dasd_device *) cqr->device;
 979         struct ccw_device *cdev = device->cdev;
 980
 981         switch (cdev->id.cu_type) {
 982         case 0x3990:
 983         case 0x2105:
 984         case 0x2107:
 985         case 0x1750:
 986                 return dasd_3990_erp_action;
 987         case 0x9343:
 988         case 0x3880:
 989         default:
 990                 return dasd_default_erp_action;
 991         }
 992 }
 993
 994 static dasd_erp_fn_t
 995 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
 996 {
 997         return dasd_default_erp_postaction;
 998 }
 999
1000 static struct dasd_ccw_req *
1001 dasd_eckd_build_cp(struct dasd_device * device, struct request *req)
1002 {
1003         struct dasd_eckd_private *private;
1004         unsigned long *idaws;
1005         struct LO_eckd_data *LO_data;
1006         struct dasd_ccw_req *cqr;
1007         struct ccw1 *ccw;
1008         struct bio *bio;
1009         struct bio_vec *bv;
1010         char *dst;
1011         unsigned int blksize, blk_per_trk, off;
1012         int count, cidaw, cplength, datasize;
1013         sector_t recid, first_rec, last_rec;
1014         sector_t first_trk, last_trk;
1015         unsigned int first_offs, last_offs;
1016         unsigned char cmd, rcmd;
1017         int i;
1018
1019         private = (struct dasd_eckd_private *) device->private;
1020         if (rq_data_dir(req) == READ)
1021                 cmd = DASD_ECKD_CCW_READ_MT;
1022         else if (rq_data_dir(req) == WRITE)
1023                 cmd = DASD_ECKD_CCW_WRITE_MT;
1024         else
1025                 return ERR_PTR(-EINVAL);
1026         /* Calculate number of blocks/records per track. */
1027         blksize = device->bp_block;
1028         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
1029         /* Calculate record id of first and last block. */
1030         first_rec = first_trk = req->sector >> device->s2b_shift;
1031         first_offs = sector_div(first_trk, blk_per_trk);
1032         last_rec = last_trk =
1033                 (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
1034         last_offs = sector_div(last_trk, blk_per_trk);
1035         /* Check struct bio and count the number of blocks for the request. */
1036         count = 0;
1037         cidaw = 0;
1038         rq_for_each_bio(bio, req) {
1039                 bio_for_each_segment(bv, bio, i) {
1040                         if (bv->bv_len & (blksize - 1))
1041                                 /* Eckd can only do full blocks. */
1042                                 return ERR_PTR(-EINVAL);
1043                         count += bv->bv_len >> (device->s2b_shift + 9);
1044 #if defined(CONFIG_ARCH_S390X)
1045                         if (idal_is_needed (page_address(bv->bv_page),
1046                                             bv->bv_len))
1047                                 cidaw += bv->bv_len >> (device->s2b_shift + 9);
1048 #endif
1049                 }
1050         }
1051         /* Paranoia. */
1052         if (count != last_rec - first_rec + 1)
1053                 return ERR_PTR(-EINVAL);
1054         /* 1x define extent + 1x locate record + number of blocks */
1055         cplength = 2 + count;
1056         /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
1057         datasize = sizeof(struct DE_eckd_data) + sizeof(struct LO_eckd_data) +
1058                 cidaw * sizeof(unsigned long);
1059         /* Find out the number of additional locate record ccws for cdl. */
1060         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
1061                 if (last_rec >= 2*blk_per_trk)
1062                         count = 2*blk_per_trk - first_rec;
1063                 cplength += count;
1064                 datasize += count*sizeof(struct LO_eckd_data);
1065         }
1066         /* Allocate the ccw request. */
1067         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1068                                    cplength, datasize, device);
1069         if (IS_ERR(cqr))
1070                 return cqr;
1071         ccw = cqr->cpaddr;
1072         /* First ccw is define extent. */
1073         define_extent(ccw++, cqr->data, first_trk, last_trk, cmd, device);
1074         /* Build locate_record+read/write/ccws. */
1075         idaws = (unsigned long *) (cqr->data + sizeof(struct DE_eckd_data));
1076         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
1077         recid = first_rec;
1078         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
1079                 /* Only standard blocks so there is just one locate record. */
1080                 ccw[-1].flags |= CCW_FLAG_CC;
1081                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
1082                               last_rec - recid + 1, cmd, device, blksize);
1083         }
1084         rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
1085                 dst = page_address(bv->bv_page) + bv->bv_offset;
1086                 if (dasd_page_cache) {
1087                         char *copy = kmem_cache_alloc(dasd_page_cache,
1088                                                       SLAB_DMA | __GFP_NOWARN);
1089                         if (copy && rq_data_dir(req) == WRITE)
1090                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
1091                         if (copy)
1092                                 dst = copy + bv->bv_offset;
1093                 }
1094                 for (off = 0; off < bv->bv_len; off += blksize) {
1095                         sector_t trkid = recid;
1096                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
1097                         rcmd = cmd;
1098                         count = blksize;
1099                         /* Locate record for cdl special block ? */
1100                         if (private->uses_cdl && recid < 2*blk_per_trk) {
1101                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
1102                                         rcmd |= 0x8;
1103                                         count = dasd_eckd_cdl_reclen(recid);
1104                                         if (count < blksize)
1105                                                 memset(dst + count, 0xe5,
1106                                                        blksize - count);
1107                                 }
1108                                 ccw[-1].flags |= CCW_FLAG_CC;
1109                                 locate_record(ccw++, LO_data++,
1110                                               trkid, recoffs + 1,
1111                                               1, rcmd, device, count);
1112                         }
1113                         /* Locate record for standard blocks ? */
1114                         if (private->uses_cdl && recid == 2*blk_per_trk) {
1115                                 ccw[-1].flags |= CCW_FLAG_CC;
1116                                 locate_record(ccw++, LO_data++,
1117                                               trkid, recoffs + 1,
1118                                               last_rec - recid + 1,
1119                                               cmd, device, count);
1120                         }
1121                         /* Read/write ccw. */
1122                         ccw[-1].flags |= CCW_FLAG_CC;
1123                         ccw->cmd_code = rcmd;
1124                         ccw->count = count;
1125                         if (idal_is_needed(dst, blksize)) {
1126                                 ccw->cda = (__u32)(addr_t) idaws;
1127                                 ccw->flags = CCW_FLAG_IDA;
1128                                 idaws = idal_create_words(idaws, dst, blksize);
1129                         } else {
1130                                 ccw->cda = (__u32)(addr_t) dst;
1131                                 ccw->flags = 0;
1132                         }
1133                         ccw++;
1134                         dst += blksize;
1135                         recid++;
1136                 }
1137         }
1138         cqr->device = device;
1139         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
1140         cqr->lpm = private->path_data.ppm;
1141         cqr->retries = 256;
1142         cqr->buildclk = get_clock();
1143         cqr->status = DASD_CQR_FILLED;
1144         return cqr;
1145 }
1146
1147 static int
1148 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
1149 {
1150         struct dasd_eckd_private *private;
1151         struct ccw1 *ccw;
1152         struct bio *bio;
1153         struct bio_vec *bv;
1154         char *dst, *cda;
1155         unsigned int blksize, blk_per_trk, off;
1156         sector_t recid;
1157         int i, status;
1158
1159         if (!dasd_page_cache)
1160                 goto out;
1161         private = (struct dasd_eckd_private *) cqr->device->private;
1162         blksize = cqr->device->bp_block;
1163         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
1164         recid = req->sector >> cqr->device->s2b_shift;
1165         ccw = cqr->cpaddr;
1166         /* Skip over define extent & locate record. */
1167         ccw++;
1168         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
1169                 ccw++;
1170         rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
1171                 dst = page_address(bv->bv_page) + bv->bv_offset;
1172                 for (off = 0; off < bv->bv_len; off += blksize) {
1173                         /* Skip locate record. */
1174                         if (private->uses_cdl && recid <= 2*blk_per_trk)
1175                                 ccw++;
1176                         if (dst) {
1177                                 if (ccw->flags & CCW_FLAG_IDA)
1178                                         cda = *((char **)((addr_t) ccw->cda));
1179                                 else
1180                                         cda = (char *)((addr_t) ccw->cda);
1181                                 if (dst != cda) {
1182                                         if (rq_data_dir(req) == READ)
1183                                                 memcpy(dst, cda, bv->bv_len);
1184                                         kmem_cache_free(dasd_page_cache,
1185                                             (void *)((addr_t)cda & PAGE_MASK));
1186                                 }
1187                                 dst = NULL;
1188                         }
1189                         ccw++;
1190                         recid++;
1191                 }
1192         }
1193 out:
1194         status = cqr->status == DASD_CQR_DONE;
1195         dasd_sfree_request(cqr, cqr->device);
1196         return status;
1197 }
1198
1199 static int
1200 dasd_eckd_fill_info(struct dasd_device * device,
1201                     struct dasd_information2_t * info)
1202 {
1203         struct dasd_eckd_private *private;
1204
1205         private = (struct dasd_eckd_private *) device->private;
1206         info->label_block = 2;
1207         info->FBA_layout = private->uses_cdl ? 0 : 1;
1208         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
1209         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
1210         memcpy(info->characteristics, &private->rdc_data,
1211                sizeof(struct dasd_eckd_characteristics));
1212         info->confdata_size = sizeof (struct dasd_eckd_confdata);
1213         memcpy(info->configuration_data, &private->conf_data,
1214                sizeof (struct dasd_eckd_confdata));
1215         return 0;
1216 }
1217
1218 /*
1219  * SECTION: ioctl functions for eckd devices.
1220  */
1221
1222 /*
1223  * Release device ioctl.
1224  * Buils a channel programm to releases a prior reserved
1225  * (see dasd_eckd_reserve) device.
1226  */
1227 static int
1228 dasd_eckd_release(struct block_device *bdev, int no, long args)
1229 {
1230         struct dasd_device *device;
1231         struct dasd_ccw_req *cqr;
1232         int rc;
1233
1234         if (!capable(CAP_SYS_ADMIN))
1235                 return -EACCES;
1236
1237         device = bdev->bd_disk->private_data;
1238         if (device == NULL)
1239                 return -ENODEV;
1240
1241         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1242                                    1, 32, device);
1243         if (IS_ERR(cqr)) {
1244                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1245                             "Could not allocate initialization request");
1246                 return PTR_ERR(cqr);
1247         }
1248         cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RELEASE;
1249         cqr->cpaddr->flags |= CCW_FLAG_SLI;
1250         cqr->cpaddr->count = 32;
1251         cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1252         cqr->device = device;
1253         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1254         cqr->retries = 0;
1255         cqr->expires = 2 * HZ;
1256         cqr->buildclk = get_clock();
1257         cqr->status = DASD_CQR_FILLED;
1258
1259         rc = dasd_sleep_on_immediatly(cqr);
1260
1261         dasd_sfree_request(cqr, cqr->device);
1262         return rc;
1263 }
1264
1265 /*
1266  * Reserve device ioctl.
1267  * Options are set to 'synchronous wait for interrupt' and
1268  * 'timeout the request'. This leads to a terminate IO if
1269  * the interrupt is outstanding for a certain time.
1270  */
1271 static int
1272 dasd_eckd_reserve(struct block_device *bdev, int no, long args)
1273 {
1274         struct dasd_device *device;
1275         struct dasd_ccw_req *cqr;
1276         int rc;
1277
1278         if (!capable(CAP_SYS_ADMIN))
1279                 return -EACCES;
1280
1281         device = bdev->bd_disk->private_data;
1282         if (device == NULL)
1283                 return -ENODEV;
1284
1285         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1286                                    1, 32, device);
1287         if (IS_ERR(cqr)) {
1288                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1289                             "Could not allocate initialization request");
1290                 return PTR_ERR(cqr);
1291         }
1292         cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RESERVE;
1293         cqr->cpaddr->flags |= CCW_FLAG_SLI;
1294         cqr->cpaddr->count = 32;
1295         cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1296         cqr->device = device;
1297         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1298         cqr->retries = 0;
1299         cqr->expires = 2 * HZ;
1300         cqr->buildclk = get_clock();
1301         cqr->status = DASD_CQR_FILLED;
1302
1303         rc = dasd_sleep_on_immediatly(cqr);
1304
1305         dasd_sfree_request(cqr, cqr->device);
1306         return rc;
1307 }
1308
1309 /*
1310  * Steal lock ioctl - unconditional reserve device.
1311  * Buils a channel programm to break a device's reservation.
1312  * (unconditional reserve)
1313  */
1314 static int
1315 dasd_eckd_steal_lock(struct block_device *bdev, int no, long args)
1316 {
1317         struct dasd_device *device;
1318         struct dasd_ccw_req *cqr;
1319         int rc;
1320
1321         if (!capable(CAP_SYS_ADMIN))
1322                 return -EACCES;
1323
1324         device = bdev->bd_disk->private_data;
1325         if (device == NULL)
1326                 return -ENODEV;
1327
1328         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1329                                    1, 32, device);
1330         if (IS_ERR(cqr)) {
1331                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1332                             "Could not allocate initialization request");
1333                 return PTR_ERR(cqr);
1334         }
1335         cqr->cpaddr->cmd_code = DASD_ECKD_CCW_SLCK;
1336         cqr->cpaddr->flags |= CCW_FLAG_SLI;
1337         cqr->cpaddr->count = 32;
1338         cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1339         cqr->device = device;
1340         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1341         cqr->retries = 0;
1342         cqr->expires = 2 * HZ;
1343         cqr->buildclk = get_clock();
1344         cqr->status = DASD_CQR_FILLED;
1345
1346         rc = dasd_sleep_on_immediatly(cqr);
1347
1348         dasd_sfree_request(cqr, cqr->device);
1349         return rc;
1350 }
1351
1352 /*
1353  * Read performance statistics
1354  */
1355 static int
1356 dasd_eckd_performance(struct block_device *bdev, int no, long args)
1357 {
1358         struct dasd_device *device;
1359         struct dasd_psf_prssd_data *prssdp;
1360         struct dasd_rssd_perf_stats_t *stats;
1361         struct dasd_ccw_req *cqr;
1362         struct ccw1 *ccw;
1363         int rc;
1364
1365         device = bdev->bd_disk->private_data;
1366         if (device == NULL)
1367                 return -ENODEV;
1368
1369         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1370                                    1 /* PSF */  + 1 /* RSSD */ ,
1371                                    (sizeof (struct dasd_psf_prssd_data) +
1372                                     sizeof (struct dasd_rssd_perf_stats_t)),
1373                                    device);
1374         if (IS_ERR(cqr)) {
1375                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1376                             "Could not allocate initialization request");
1377                 return PTR_ERR(cqr);
1378         }
1379         cqr->device = device;
1380         cqr->retries = 0;
1381         cqr->expires = 10 * HZ;
1382
1383         /* Prepare for Read Subsystem Data */
1384         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1385         memset(prssdp, 0, sizeof (struct dasd_psf_prssd_data));
1386         prssdp->order = PSF_ORDER_PRSSD;
1387         prssdp->suborder = 0x01;        /* Perfomance Statistics */
1388         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
1389
1390         ccw = cqr->cpaddr;
1391         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1392         ccw->count = sizeof (struct dasd_psf_prssd_data);
1393         ccw->flags |= CCW_FLAG_CC;
1394         ccw->cda = (__u32)(addr_t) prssdp;
1395
1396         /* Read Subsystem Data - Performance Statistics */
1397         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
1398         memset(stats, 0, sizeof (struct dasd_rssd_perf_stats_t));
1399
1400         ccw++;
1401         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1402         ccw->count = sizeof (struct dasd_rssd_perf_stats_t);
1403         ccw->cda = (__u32)(addr_t) stats;
1404
1405         cqr->buildclk = get_clock();
1406         cqr->status = DASD_CQR_FILLED;
1407         rc = dasd_sleep_on(cqr);
1408         if (rc == 0) {
1409                 /* Prepare for Read Subsystem Data */
1410                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1411                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
1412                 rc = copy_to_user((long __user *) args, (long *) stats,
1413                                   sizeof(struct dasd_rssd_perf_stats_t));
1414         }
1415         dasd_sfree_request(cqr, cqr->device);
1416         return rc;
1417 }
1418
1419 /*
1420  * Get attributes (cache operations)
1421  * Returnes the cache attributes used in Define Extend (DE).
1422  */
1423 static int
1424 dasd_eckd_get_attrib (struct block_device *bdev, int no, long args)
1425 {
1426         struct dasd_device *device;
1427         struct dasd_eckd_private *private;
1428         struct attrib_data_t attrib;
1429         int rc;
1430
1431         if (!capable(CAP_SYS_ADMIN))
1432                 return -EACCES;
1433         if (!args)
1434                 return -EINVAL;
1435
1436         device = bdev->bd_disk->private_data;
1437         if (device == NULL)
1438                 return -ENODEV;
1439
1440         private = (struct dasd_eckd_private *) device->private;
1441         attrib = private->attrib;
1442
1443         rc = copy_to_user((long __user *) args, (long *) &attrib,
1444                           sizeof (struct attrib_data_t));
1445
1446         return rc;
1447 }
1448
1449 /*
1450  * Set attributes (cache operations)
1451  * Stores the attributes for cache operation to be used in Define Extend (DE).
1452  */
1453 static int
1454 dasd_eckd_set_attrib(struct block_device *bdev, int no, long args)
1455 {
1456         struct dasd_device *device;
1457         struct dasd_eckd_private *private;
1458         struct attrib_data_t attrib;
1459
1460         if (!capable(CAP_SYS_ADMIN))
1461                 return -EACCES;
1462         if (!args)
1463                 return -EINVAL;
1464
1465         device = bdev->bd_disk->private_data;
1466         if (device == NULL)
1467                 return -ENODEV;
1468
1469         if (copy_from_user(&attrib, (void __user *) args,
1470                            sizeof (struct attrib_data_t))) {
1471                 return -EFAULT;
1472         }
1473         private = (struct dasd_eckd_private *) device->private;
1474         private->attrib = attrib;
1475
1476         DEV_MESSAGE(KERN_INFO, device,
1477                     "cache operation mode set to %x (%i cylinder prestage)",
1478                     private->attrib.operation, private->attrib.nr_cyl);
1479         return 0;
1480 }
1481
1482 /*
1483  * Print sense data and related channel program.
1484  * Parts are printed because printk buffer is only 1024 bytes.
1485  */
1486 static void
1487 dasd_eckd_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
1488                      struct irb *irb)
1489 {
1490         char *page;
1491         struct ccw1 *act, *end, *last;
1492         int len, sl, sct, count;
1493
1494         page = (char *) get_zeroed_page(GFP_ATOMIC);
1495         if (page == NULL) {
1496                 DEV_MESSAGE(KERN_ERR, device, " %s",
1497                             "No memory to dump sense data");
1498                 return;
1499         }
1500         len = sprintf(page, KERN_ERR PRINTK_HEADER
1501                       " I/O status report for device %s:\n",
1502                       device->cdev->dev.bus_id);
1503         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1504                        " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
1505                        irb->scsw.cstat, irb->scsw.dstat);
1506         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1507                        " device %s: Failing CCW: %p\n",
1508                        device->cdev->dev.bus_id,
1509                        (void *) (addr_t) irb->scsw.cpa);
1510         if (irb->esw.esw0.erw.cons) {
1511                 for (sl = 0; sl < 4; sl++) {
1512                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1513                                        " Sense(hex) %2d-%2d:",
1514                                        (8 * sl), ((8 * sl) + 7));
1515
1516                         for (sct = 0; sct < 8; sct++) {
1517                                 len += sprintf(page + len, " %02x",
1518                                                irb->ecw[8 * sl + sct]);
1519                         }
1520                         len += sprintf(page + len, "\n");
1521                 }
1522
1523                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
1524                         /* 24 Byte Sense Data */
1525                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1526                                        " 24 Byte: %x MSG %x, "
1527                                        "%s MSGb to SYSOP\n",
1528                                        irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
1529                                        irb->ecw[1] & 0x10 ? "" : "no");
1530                 } else {
1531                         /* 32 Byte Sense Data */
1532                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1533                                        " 32 Byte: Format: %x "
1534                                        "Exception class %x\n",
1535                                        irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
1536                 }
1537         } else {
1538                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1539                                " SORRY - NO VALID SENSE AVAILABLE\n");
1540         }
1541         MESSAGE_LOG(KERN_ERR, "%s",
1542                     page + sizeof(KERN_ERR PRINTK_HEADER));
1543
1544         /* dump the Channel Program */
1545         /* print first CCWs (maximum 8) */
1546         act = req->cpaddr;
1547         for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
1548         end = min(act + 8, last);
1549         len = sprintf(page, KERN_ERR PRINTK_HEADER
1550                       " Related CP in req: %p\n", req);
1551         while (act <= end) {
1552                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1553                                " CCW %p: %08X %08X DAT:",
1554                                act, ((int *) act)[0], ((int *) act)[1]);
1555                 for (count = 0; count < 32 && count < act->count;
1556                      count += sizeof(int))
1557                         len += sprintf(page + len, " %08X",
1558                                        ((int *) (addr_t) act->cda)
1559                                        [(count>>2)]);
1560                 len += sprintf(page + len, "\n");
1561                 act++;
1562         }
1563         MESSAGE_LOG(KERN_ERR, "%s",
1564                     page + sizeof(KERN_ERR PRINTK_HEADER));
1565
1566         /* print failing CCW area */
1567         len = 0;
1568         if (act <  ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2) {
1569                 act = ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2;
1570                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
1571         }
1572         end = min((struct ccw1 *)(addr_t) irb->scsw.cpa + 2, last);
1573         while (act <= end) {
1574                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1575                                " CCW %p: %08X %08X DAT:",
1576                                act, ((int *) act)[0], ((int *) act)[1]);
1577                 for (count = 0; count < 32 && count < act->count;
1578                      count += sizeof(int))
1579                         len += sprintf(page + len, " %08X",
1580                                        ((int *) (addr_t) act->cda)
1581                                        [(count>>2)]);
1582                 len += sprintf(page + len, "\n");
1583                 act++;
1584         }
1585
1586         /* print last CCWs */
1587         if (act <  last - 2) {
1588                 act = last - 2;
1589                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
1590         }
1591         while (act <= last) {
1592                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1593                                " CCW %p: %08X %08X DAT:",
1594                                act, ((int *) act)[0], ((int *) act)[1]);
1595                 for (count = 0; count < 32 && count < act->count;
1596                      count += sizeof(int))
1597                         len += sprintf(page + len, " %08X",
1598                                        ((int *) (addr_t) act->cda)
1599                                        [(count>>2)]);
1600                 len += sprintf(page + len, "\n");
1601                 act++;
1602         }
1603         if (len > 0)
1604                 MESSAGE_LOG(KERN_ERR, "%s",
1605                             page + sizeof(KERN_ERR PRINTK_HEADER));
1606         free_page((unsigned long) page);
1607 }
1608
1609 /*
1610  * max_blocks is dependent on the amount of storage that is available
1611  * in the static io buffer for each device. Currently each device has
1612  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
1613  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
1614  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
1615  * addition we have one define extent ccw + 16 bytes of data and one
1616  * locate record ccw + 16 bytes of data. That makes:
1617  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
1618  * We want to fit two into the available memory so that we can immediately
1619  * start the next request if one finishes off. That makes 249.5 blocks
1620  * for one request. Give a little safety and the result is 240.
1621  */
1622 static struct dasd_discipline dasd_eckd_discipline = {
1623         .owner = THIS_MODULE,
1624         .name = "ECKD",
1625         .ebcname = "ECKD",
1626         .max_blocks = 240,
1627         .check_device = dasd_eckd_check_characteristics,
1628         .do_analysis = dasd_eckd_do_analysis,
1629         .fill_geometry = dasd_eckd_fill_geometry,
1630         .start_IO = dasd_start_IO,
1631         .term_IO = dasd_term_IO,
1632         .format_device = dasd_eckd_format_device,
1633         .examine_error = dasd_eckd_examine_error,
1634         .erp_action = dasd_eckd_erp_action,
1635         .erp_postaction = dasd_eckd_erp_postaction,
1636         .build_cp = dasd_eckd_build_cp,
1637         .free_cp = dasd_eckd_free_cp,
1638         .dump_sense = dasd_eckd_dump_sense,
1639         .fill_info = dasd_eckd_fill_info,
1640 };
1641
1642 static int __init
1643 dasd_eckd_init(void)
1644 {
1645         int ret;
1646
1647         dasd_ioctl_no_register(THIS_MODULE, BIODASDGATTR,
1648                                dasd_eckd_get_attrib);
1649         dasd_ioctl_no_register(THIS_MODULE, BIODASDSATTR,
1650                                dasd_eckd_set_attrib);
1651         dasd_ioctl_no_register(THIS_MODULE, BIODASDPSRD,
1652                                dasd_eckd_performance);
1653         dasd_ioctl_no_register(THIS_MODULE, BIODASDRLSE,
1654                                dasd_eckd_release);
1655         dasd_ioctl_no_register(THIS_MODULE, BIODASDRSRV,
1656                                dasd_eckd_reserve);
1657         dasd_ioctl_no_register(THIS_MODULE, BIODASDSLCK,
1658                                dasd_eckd_steal_lock);
1659
1660         ASCEBC(dasd_eckd_discipline.ebcname, 4);
1661
1662         ret = ccw_driver_register(&dasd_eckd_driver);
1663         if (ret) {
1664                 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDGATTR,
1665                                          dasd_eckd_get_attrib);
1666                 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDSATTR,
1667                                          dasd_eckd_set_attrib);
1668                 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDPSRD,
1669                                          dasd_eckd_performance);
1670                 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDRLSE,
1671                                          dasd_eckd_release);
1672                 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDRSRV,
1673                                          dasd_eckd_reserve);
1674                 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDSLCK,
1675                                          dasd_eckd_steal_lock);
1676                 return ret;
1677         }
1678
1679         dasd_generic_auto_online(&dasd_eckd_driver);
1680         return 0;
1681 }
1682
1683 static void __exit
1684 dasd_eckd_cleanup(void)
1685 {
1686         ccw_driver_unregister(&dasd_eckd_driver);
1687
1688         dasd_ioctl_no_unregister(THIS_MODULE, BIODASDGATTR,
1689                                  dasd_eckd_get_attrib);
1690         dasd_ioctl_no_unregister(THIS_MODULE, BIODASDSATTR,
1691                                  dasd_eckd_set_attrib);
1692         dasd_ioctl_no_unregister(THIS_MODULE, BIODASDPSRD,
1693                                  dasd_eckd_performance);
1694         dasd_ioctl_no_unregister(THIS_MODULE, BIODASDRLSE,
1695                                  dasd_eckd_release);
1696         dasd_ioctl_no_unregister(THIS_MODULE, BIODASDRSRV,
1697                                  dasd_eckd_reserve);
1698         dasd_ioctl_no_unregister(THIS_MODULE, BIODASDSLCK,
1699                                  dasd_eckd_steal_lock);
1700 }
1701
1702 module_init(dasd_eckd_init);
1703 module_exit(dasd_eckd_cleanup);
1704
1705 /*
1706  * Overrides for Emacs so that we follow Linus's tabbing style.
1707  * Emacs will notice this stuff at the end of the file and automatically
1708  * adjust the settings for this buffer only.  This must remain at the end
1709  * of the file.
1710  * ---------------------------------------------------------------------------
1711  * Local variables:
1712  * c-indent-level: 4
1713  * c-brace-imaginary-offset: 0
1714  * c-brace-offset: -4
1715  * c-argdecl-indent: 4
1716  * c-label-offset: -4
1717  * c-continued-statement-offset: 4
1718  * c-continued-brace-offset: 0
1719  * indent-tabs-mode: 1
1720  * tab-width: 8
1721  * End:
1722  */