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

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_eckd.c
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5  *                  Carsten Otte <Cotte@de.ibm.com>
   6  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  * Bugreports.to..: <Linux390@de.ibm.com>
   8  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
   9  *
  10  */
  11
  12 #include <linux/config.h>
  13 #include <linux/stddef.h>
  14 #include <linux/kernel.h>
  15 #include <linux/slab.h>
  16 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  17 #include <linux/bio.h>
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20
  21 #include <asm/debug.h>
  22 #include <asm/idals.h>
  23 #include <asm/ebcdic.h>
  24 #include <asm/io.h>
  25 #include <asm/todclk.h>
  26 #include <asm/uaccess.h>
  27 #include <asm/ccwdev.h>
  28
  29 #include "dasd_int.h"
  30 #include "dasd_eckd.h"
  31
  32 #ifdef PRINTK_HEADER
  33 #undef PRINTK_HEADER
  34 #endif                          /* PRINTK_HEADER */
  35 #define PRINTK_HEADER "dasd(eckd):"
  36
  37 #define ECKD_C0(i) (i->home_bytes)
  38 #define ECKD_F(i) (i->formula)
  39 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
  40                     (i->factors.f_0x02.f1))
  41 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
  42                     (i->factors.f_0x02.f2))
  43 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
  44                     (i->factors.f_0x02.f3))
  45 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
  46 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
  47 #define ECKD_F6(i) (i->factor6)
  48 #define ECKD_F7(i) (i->factor7)
  49 #define ECKD_F8(i) (i->factor8)
  50
  51 MODULE_LICENSE("GPL");
  52
  53 static struct dasd_discipline dasd_eckd_discipline;
  54
  55 struct dasd_eckd_private {
  56         struct dasd_eckd_characteristics rdc_data;
  57         struct dasd_eckd_confdata conf_data;
  58         struct dasd_eckd_path path_data;
  59         struct eckd_count count_area[5];
  60         int init_cqr_status;
  61         int uses_cdl;
  62         struct attrib_data_t attrib;    /* e.g. cache operations */
  63 };
  64
  65 /* The ccw bus type uses this table to find devices that it sends to
  66  * dasd_eckd_probe */
  67 static struct ccw_device_id dasd_eckd_ids[] = {
  68         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), driver_info: 0x1},
  69         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), driver_info: 0x2},
  70         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3390, 0), driver_info: 0x3},
  71         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), driver_info: 0x4},
  72         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), driver_info: 0x5},
  73         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), driver_info: 0x6},
  74         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), driver_info: 0x7},
  75         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), driver_info: 0x8},
  76         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), driver_info: 0x9},
  77         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), driver_info: 0xa},
  78         { /* end of list */ },
  79 };
  80
  81 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  82
  83 static struct ccw_driver dasd_eckd_driver; /* see below */
  84
  85 /* initial attempt at a probe function. this can be simplified once
  86  * the other detection code is gone */
  87 static int
  88 dasd_eckd_probe (struct ccw_device *cdev)
  89 {
  90         int ret;
  91
  92         ret = dasd_generic_probe (cdev, &dasd_eckd_discipline);
  93         if (ret)
  94                 return ret;
  95         ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP | CCWDEV_ALLOW_FORCE);
  96         return 0;
  97 }
  98
  99 static int
 100 dasd_eckd_set_online(struct ccw_device *cdev)
 101 {
 102         return dasd_generic_set_online (cdev, &dasd_eckd_discipline);
 103 }
 104
 105 static struct ccw_driver dasd_eckd_driver = {
 106         .name        = "dasd-eckd",
 107         .owner       = THIS_MODULE,
 108         .ids         = dasd_eckd_ids,
 109         .probe       = dasd_eckd_probe,
 110         .remove      = dasd_generic_remove,
 111         .set_offline = dasd_generic_set_offline,
 112         .set_online  = dasd_eckd_set_online,
 113         .notify      = dasd_generic_notify,
 114 };
 115
 116 static const int sizes_trk0[] = { 28, 148, 84 };
 117 #define LABEL_SIZE 140
 118
 119 static inline unsigned int
 120 round_up_multiple(unsigned int no, unsigned int mult)
 121 {
 122         int rem = no % mult;
 123         return (rem ? no - rem + mult : no);
 124 }
 125
 126 static inline unsigned int
 127 ceil_quot(unsigned int d1, unsigned int d2)
 128 {
 129         return (d1 + (d2 - 1)) / d2;
 130 }
 131
 132 static inline int
 133 bytes_per_record(struct dasd_eckd_characteristics *rdc, int kl, int dl)
 134 {
 135         unsigned int fl1, fl2, int1, int2;
 136         int bpr;
 137
 138         switch (rdc->formula) {
 139         case 0x01:
 140                 fl1 = round_up_multiple(ECKD_F2(rdc) + dl, ECKD_F1(rdc));
 141                 fl2 = round_up_multiple(kl ? ECKD_F2(rdc) + kl : 0,
 142                                         ECKD_F1(rdc));
 143                 bpr = fl1 + fl2;
 144                 break;
 145         case 0x02:
 146                 int1 = ceil_quot(dl + ECKD_F6(rdc), ECKD_F5(rdc) << 1);
 147                 int2 = ceil_quot(kl + ECKD_F6(rdc), ECKD_F5(rdc) << 1);
 148                 fl1 = round_up_multiple(ECKD_F1(rdc) * ECKD_F2(rdc) + dl +
 149                                         ECKD_F6(rdc) + ECKD_F4(rdc) * int1,
 150                                         ECKD_F1(rdc));
 151                 fl2 = round_up_multiple(ECKD_F1(rdc) * ECKD_F3(rdc) + kl +
 152                                         ECKD_F6(rdc) + ECKD_F4(rdc) * int2,
 153                                         ECKD_F1(rdc));
 154                 bpr = fl1 + fl2;
 155                 break;
 156         default:
 157                 bpr = 0;
 158                 break;
 159         }
 160         return bpr;
 161 }
 162
 163 static inline unsigned int
 164 bytes_per_track(struct dasd_eckd_characteristics *rdc)
 165 {
 166         return *(unsigned int *) (rdc->byte_per_track) >> 8;
 167 }
 168
 169 static inline unsigned int
 170 recs_per_track(struct dasd_eckd_characteristics * rdc,
 171                unsigned int kl, unsigned int dl)
 172 {
 173         int dn, kn;
 174
 175         switch (rdc->dev_type) {
 176         case 0x3380:
 177                 if (kl)
 178                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 179                                        ceil_quot(dl + 12, 32));
 180                 else
 181                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 182         case 0x3390:
 183                 dn = ceil_quot(dl + 6, 232) + 1;
 184                 if (kl) {
 185                         kn = ceil_quot(kl + 6, 232) + 1;
 186                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 187                                        9 + ceil_quot(dl + 6 * dn, 34));
 188                 } else
 189                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 190         case 0x9345:
 191                 dn = ceil_quot(dl + 6, 232) + 1;
 192                 if (kl) {
 193                         kn = ceil_quot(kl + 6, 232) + 1;
 194                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 195                                        ceil_quot(dl + 6 * dn, 34));
 196                 } else
 197                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 198         }
 199         return 0;
 200 }
 201
 202 static inline void
 203 check_XRC (struct ccw1         *de_ccw,
 204            struct DE_eckd_data *data,
 205            struct dasd_device  *device)
 206 {
 207         struct dasd_eckd_private *private;
 208
 209         private = (struct dasd_eckd_private *) device->private;
 210
 211         /* switch on System Time Stamp - needed for XRC Support */
 212         if (private->rdc_data.facilities.XRC_supported) {
 213
 214                 data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 215                 data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 216
 217                 data->ep_sys_time = get_clock ();
 218
 219                 de_ccw->count = sizeof (struct DE_eckd_data);
 220                 de_ccw->flags |= CCW_FLAG_SLI;
 221         }
 222
 223         return;
 224
 225 } /* end check_XRC */
 226
 227 static inline void
 228 define_extent(struct ccw1 * ccw, struct DE_eckd_data * data, int trk,
 229               int totrk, int cmd, struct dasd_device * device)
 230 {
 231         struct dasd_eckd_private *private;
 232         struct ch_t geo, beg, end;
 233
 234         private = (struct dasd_eckd_private *) device->private;
 235
 236         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 237         ccw->flags = 0;
 238         ccw->count = 16;
 239         ccw->cda = (__u32) __pa(data);
 240
 241         memset(data, 0, sizeof (struct DE_eckd_data));
 242         switch (cmd) {
 243         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 244         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 245         case DASD_ECKD_CCW_READ:
 246         case DASD_ECKD_CCW_READ_MT:
 247         case DASD_ECKD_CCW_READ_CKD:
 248         case DASD_ECKD_CCW_READ_CKD_MT:
 249         case DASD_ECKD_CCW_READ_KD:
 250         case DASD_ECKD_CCW_READ_KD_MT:
 251         case DASD_ECKD_CCW_READ_COUNT:
 252                 data->mask.perm = 0x1;
 253                 data->attributes.operation = private->attrib.operation;
 254                 break;
 255         case DASD_ECKD_CCW_WRITE:
 256         case DASD_ECKD_CCW_WRITE_MT:
 257         case DASD_ECKD_CCW_WRITE_KD:
 258         case DASD_ECKD_CCW_WRITE_KD_MT:
 259                 data->mask.perm = 0x02;
 260                 data->attributes.operation = private->attrib.operation;
 261                 check_XRC (ccw, data, device);
 262                 break;
 263         case DASD_ECKD_CCW_WRITE_CKD:
 264         case DASD_ECKD_CCW_WRITE_CKD_MT:
 265                 data->attributes.operation = DASD_BYPASS_CACHE;
 266                 check_XRC (ccw, data, device);
 267                 break;
 268         case DASD_ECKD_CCW_ERASE:
 269         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 270         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 271                 data->mask.perm = 0x3;
 272                 data->mask.auth = 0x1;
 273                 data->attributes.operation = DASD_BYPASS_CACHE;
 274                 check_XRC (ccw, data, device);
 275                 break;
 276         default:
 277                 DEV_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", cmd);
 278                 break;
 279         }
 280
 281         data->attributes.mode = 0x3;    /* ECKD */
 282
 283         if ((private->rdc_data.cu_type == 0x2105 ||
 284              private->rdc_data.cu_type == 0x2107 ||
 285              private->rdc_data.cu_type == 0x1750)
 286             && !(private->uses_cdl && trk < 2))
 287                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 288
 289         geo.cyl = private->rdc_data.no_cyl;
 290         geo.head = private->rdc_data.trk_per_cyl;
 291         beg.cyl = trk / geo.head;
 292         beg.head = trk % geo.head;
 293         end.cyl = totrk / geo.head;
 294         end.head = totrk % geo.head;
 295
 296         /* check for sequential prestage - enhance cylinder range */
 297         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 298             data->attributes.operation == DASD_SEQ_ACCESS) {
 299
 300                 if (end.cyl + private->attrib.nr_cyl < geo.cyl)
 301                         end.cyl += private->attrib.nr_cyl;
 302                 else
 303                         end.cyl = (geo.cyl - 1);
 304         }
 305
 306         data->beg_ext.cyl = beg.cyl;
 307         data->beg_ext.head = beg.head;
 308         data->end_ext.cyl = end.cyl;
 309         data->end_ext.head = end.head;
 310 }
 311
 312 static inline void
 313 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, int trk,
 314               int rec_on_trk, int no_rec, int cmd,
 315               struct dasd_device * device, int reclen)
 316 {
 317         struct dasd_eckd_private *private;
 318         int sector;
 319         int dn, d;
 320
 321         private = (struct dasd_eckd_private *) device->private;
 322
 323         DBF_DEV_EVENT(DBF_INFO, device,
 324                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 325                   trk, rec_on_trk, no_rec, cmd, reclen);
 326
 327         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 328         ccw->flags = 0;
 329         ccw->count = 16;
 330         ccw->cda = (__u32) __pa(data);
 331
 332         memset(data, 0, sizeof (struct LO_eckd_data));
 333         sector = 0;
 334         if (rec_on_trk) {
 335                 switch (private->rdc_data.dev_type) {
 336                 case 0x3390:
 337                         dn = ceil_quot(reclen + 6, 232);
 338                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 339                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 340                         break;
 341                 case 0x3380:
 342                         d = 7 + ceil_quot(reclen + 12, 32);
 343                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 344                         break;
 345                 }
 346         }
 347         data->sector = sector;
 348         data->count = no_rec;
 349         switch (cmd) {
 350         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 351                 data->operation.orientation = 0x3;
 352                 data->operation.operation = 0x03;
 353                 break;
 354         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 355                 data->operation.orientation = 0x3;
 356                 data->operation.operation = 0x16;
 357                 break;
 358         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 359                 data->operation.orientation = 0x1;
 360                 data->operation.operation = 0x03;
 361                 data->count++;
 362                 break;
 363         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 364                 data->operation.orientation = 0x3;
 365                 data->operation.operation = 0x16;
 366                 data->count++;
 367                 break;
 368         case DASD_ECKD_CCW_WRITE:
 369         case DASD_ECKD_CCW_WRITE_MT:
 370         case DASD_ECKD_CCW_WRITE_KD:
 371         case DASD_ECKD_CCW_WRITE_KD_MT:
 372                 data->auxiliary.last_bytes_used = 0x1;
 373                 data->length = reclen;
 374                 data->operation.operation = 0x01;
 375                 break;
 376         case DASD_ECKD_CCW_WRITE_CKD:
 377         case DASD_ECKD_CCW_WRITE_CKD_MT:
 378                 data->auxiliary.last_bytes_used = 0x1;
 379                 data->length = reclen;
 380                 data->operation.operation = 0x03;
 381                 break;
 382         case DASD_ECKD_CCW_READ:
 383         case DASD_ECKD_CCW_READ_MT:
 384         case DASD_ECKD_CCW_READ_KD:
 385         case DASD_ECKD_CCW_READ_KD_MT:
 386                 data->auxiliary.last_bytes_used = 0x1;
 387                 data->length = reclen;
 388                 data->operation.operation = 0x06;
 389                 break;
 390         case DASD_ECKD_CCW_READ_CKD:
 391         case DASD_ECKD_CCW_READ_CKD_MT:
 392                 data->auxiliary.last_bytes_used = 0x1;
 393                 data->length = reclen;
 394                 data->operation.operation = 0x16;
 395                 break;
 396         case DASD_ECKD_CCW_READ_COUNT:
 397                 data->operation.operation = 0x06;
 398                 break;
 399         case DASD_ECKD_CCW_ERASE:
 400                 data->length = reclen;
 401                 data->auxiliary.last_bytes_used = 0x1;
 402                 data->operation.operation = 0x0b;
 403                 break;
 404         default:
 405                 DEV_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", cmd);
 406         }
 407         data->seek_addr.cyl = data->search_arg.cyl =
 408                 trk / private->rdc_data.trk_per_cyl;
 409         data->seek_addr.head = data->search_arg.head =
 410                 trk % private->rdc_data.trk_per_cyl;
 411         data->search_arg.record = rec_on_trk;
 412 }
 413
 414 /*
 415  * Returns 1 if the block is one of the special blocks that needs
 416  * to get read/written with the KD variant of the command.
 417  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 418  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 419  * Luckily the KD variants differ only by one bit (0x08) from the
 420  * normal variant. So don't wonder about code like:
 421  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 422  *         ccw->cmd_code |= 0x8;
 423  */
 424 static inline int
 425 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 426 {
 427         if (recid < 3)
 428                 return 1;
 429         if (recid < blk_per_trk)
 430                 return 0;
 431         if (recid < 2 * blk_per_trk)
 432                 return 1;
 433         return 0;
 434 }
 435
 436 /*
 437  * Returns the record size for the special blocks of the cdl format.
 438  * Only returns something useful if dasd_eckd_cdl_special is true
 439  * for the recid.
 440  */
 441 static inline int
 442 dasd_eckd_cdl_reclen(int recid)
 443 {
 444         if (recid < 3)
 445                 return sizes_trk0[recid];
 446         return LABEL_SIZE;
 447 }
 448
 449 /*
 450  * Generate device unique id that specifies the physical device.
 451  */
 452 static int
 453 dasd_eckd_generate_uid(struct dasd_device *device, struct dasd_uid *uid)
 454 {
 455         struct dasd_eckd_private *private;
 456         struct dasd_eckd_confdata *confdata;
 457
 458         private = (struct dasd_eckd_private *) device->private;
 459         if (!private)
 460                 return -ENODEV;
 461         confdata = &private->conf_data;
 462         if (!confdata)
 463                 return -ENODEV;
 464
 465         memset(uid, 0, sizeof(struct dasd_uid));
 466         strncpy(uid->vendor, confdata->ned1.HDA_manufacturer,
 467                 sizeof(uid->vendor) - 1);
 468         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 469         strncpy(uid->serial, confdata->ned1.HDA_location,
 470                 sizeof(uid->serial) - 1);
 471         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 472         uid->ssid = confdata->neq.subsystemID;
 473         if (confdata->ned2.sneq.flags == 0x40) {
 474                 uid->alias = 1;
 475                 uid->unit_addr = confdata->ned2.sneq.base_unit_addr;
 476         } else
 477                 uid->unit_addr = confdata->ned1.unit_addr;
 478
 479         return 0;
 480 }
 481
 482 static int
 483 dasd_eckd_read_conf(struct dasd_device *device)
 484 {
 485         void *conf_data;
 486         int conf_len, conf_data_saved;
 487         int rc;
 488         __u8 lpm;
 489         struct dasd_eckd_private *private;
 490         struct dasd_eckd_path *path_data;
 491
 492         private = (struct dasd_eckd_private *) device->private;
 493         path_data = (struct dasd_eckd_path *) &private->path_data;
 494         path_data->opm = ccw_device_get_path_mask(device->cdev);
 495         lpm = 0x80;
 496         conf_data_saved = 0;
 497
 498         /* get configuration data per operational path */
 499         for (lpm = 0x80; lpm; lpm>>= 1) {
 500                 if (lpm & path_data->opm){
 501                         rc = read_conf_data_lpm(device->cdev, &conf_data,
 502                                                 &conf_len, lpm);
 503                         if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
 504                                 MESSAGE(KERN_WARNING,
 505                                         "Read configuration data returned "
 506                                         "error %d", rc);
 507                                 return rc;
 508                         }
 509                         if (conf_data == NULL) {
 510                                 MESSAGE(KERN_WARNING, "%s", "No configuration "
 511                                         "data retrieved");
 512                                 continue;       /* no errror */
 513                         }
 514                         if (conf_len != sizeof (struct dasd_eckd_confdata)) {
 515                                 MESSAGE(KERN_WARNING,
 516                                         "sizes of configuration data mismatch"
 517                                         "%d (read) vs %ld (expected)",
 518                                         conf_len,
 519                                         sizeof (struct dasd_eckd_confdata));
 520                                 kfree(conf_data);
 521                                 continue;       /* no errror */
 522                         }
 523                         /* save first valid configuration data */
 524                         if (!conf_data_saved){
 525                                 memcpy(&private->conf_data, conf_data,
 526                                        sizeof (struct dasd_eckd_confdata));
 527                                 conf_data_saved++;
 528                         }
 529                         switch (((char *)conf_data)[242] & 0x07){
 530                         case 0x02:
 531                                 path_data->npm |= lpm;
 532                                 break;
 533                         case 0x03:
 534                                 path_data->ppm |= lpm;
 535                                 break;
 536                         }
 537                         kfree(conf_data);
 538                 }
 539         }
 540         return 0;
 541 }
 542
 543 /*
 544  * Check device characteristics.
 545  * If the device is accessible using ECKD discipline, the device is enabled.
 546  */
 547 static int
 548 dasd_eckd_check_characteristics(struct dasd_device *device)
 549 {
 550         struct dasd_eckd_private *private;
 551         struct dasd_uid uid;
 552         void *rdc_data;
 553         int rc;
 554
 555         private = (struct dasd_eckd_private *) device->private;
 556         if (private == NULL) {
 557                 private = kmalloc(sizeof(struct dasd_eckd_private),
 558                                   GFP_KERNEL | GFP_DMA);
 559                 if (private == NULL) {
 560                         DEV_MESSAGE(KERN_WARNING, device, "%s",
 561                                     "memory allocation failed for private "
 562                                     "data");
 563                         return -ENOMEM;
 564                 }
 565                 memset(private, 0, sizeof(struct dasd_eckd_private));
 566                 device->private = (void *) private;
 567         }
 568         /* Invalidate status of initial analysis. */
 569         private->init_cqr_status = -1;
 570         /* Set default cache operations. */
 571         private->attrib.operation = DASD_NORMAL_CACHE;
 572         private->attrib.nr_cyl = 0;
 573
 574         /* Read Device Characteristics */
 575         rdc_data = (void *) &(private->rdc_data);
 576         memset(rdc_data, 0, sizeof(rdc_data));
 577         rc = read_dev_chars(device->cdev, &rdc_data, 64);
 578         if (rc) {
 579                 DEV_MESSAGE(KERN_WARNING, device,
 580                             "Read device characteristics returned error %d",
 581                             rc);
 582                 return rc;
 583         }
 584
 585         DEV_MESSAGE(KERN_INFO, device,
 586                     "%04X/%02X(CU:%04X/%02X) Cyl:%d Head:%d Sec:%d",
 587                     private->rdc_data.dev_type,
 588                     private->rdc_data.dev_model,
 589                     private->rdc_data.cu_type,
 590                     private->rdc_data.cu_model.model,
 591                     private->rdc_data.no_cyl,
 592                     private->rdc_data.trk_per_cyl,
 593                     private->rdc_data.sec_per_trk);
 594
 595         /* Read Configuration Data */
 596         rc = dasd_eckd_read_conf (device);
 597         if (rc)
 598                 return rc;
 599
 600         /* Generate device unique id and register in devmap */
 601         rc = dasd_eckd_generate_uid(device, &uid);
 602         if (rc)
 603                 return rc;
 604
 605         rc = dasd_set_uid(device->cdev, &uid);
 606
 607         return rc;
 608 }
 609
 610 static struct dasd_ccw_req *
 611 dasd_eckd_analysis_ccw(struct dasd_device *device)
 612 {
 613         struct dasd_eckd_private *private;
 614         struct eckd_count *count_data;
 615         struct LO_eckd_data *LO_data;
 616         struct dasd_ccw_req *cqr;
 617         struct ccw1 *ccw;
 618         int cplength, datasize;
 619         int i;
 620
 621         private = (struct dasd_eckd_private *) device->private;
 622
 623         cplength = 8;
 624         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
 625         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
 626                                    cplength, datasize, device);
 627         if (IS_ERR(cqr))
 628                 return cqr;
 629         ccw = cqr->cpaddr;
 630         /* Define extent for the first 3 tracks. */
 631         define_extent(ccw++, cqr->data, 0, 2,
 632                       DASD_ECKD_CCW_READ_COUNT, device);
 633         LO_data = cqr->data + sizeof (struct DE_eckd_data);
 634         /* Locate record for the first 4 records on track 0. */
 635         ccw[-1].flags |= CCW_FLAG_CC;
 636         locate_record(ccw++, LO_data++, 0, 0, 4,
 637                       DASD_ECKD_CCW_READ_COUNT, device, 0);
 638
 639         count_data = private->count_area;
 640         for (i = 0; i < 4; i++) {
 641                 ccw[-1].flags |= CCW_FLAG_CC;
 642                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
 643                 ccw->flags = 0;
 644                 ccw->count = 8;
 645                 ccw->cda = (__u32)(addr_t) count_data;
 646                 ccw++;
 647                 count_data++;
 648         }
 649
 650         /* Locate record for the first record on track 2. */
 651         ccw[-1].flags |= CCW_FLAG_CC;
 652         locate_record(ccw++, LO_data++, 2, 0, 1,
 653                       DASD_ECKD_CCW_READ_COUNT, device, 0);
 654         /* Read count ccw. */
 655         ccw[-1].flags |= CCW_FLAG_CC;
 656         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
 657         ccw->flags = 0;
 658         ccw->count = 8;
 659         ccw->cda = (__u32)(addr_t) count_data;
 660
 661         cqr->device = device;
 662         cqr->retries = 0;
 663         cqr->buildclk = get_clock();
 664         cqr->status = DASD_CQR_FILLED;
 665         return cqr;
 666 }
 667
 668 /*
 669  * This is the callback function for the init_analysis cqr. It saves
 670  * the status of the initial analysis ccw before it frees it and kicks
 671  * the device to continue the startup sequence. This will call
 672  * dasd_eckd_do_analysis again (if the devices has not been marked
 673  * for deletion in the meantime).
 674  */
 675 static void
 676 dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, void *data)
 677 {
 678         struct dasd_eckd_private *private;
 679         struct dasd_device *device;
 680
 681         device = init_cqr->device;
 682         private = (struct dasd_eckd_private *) device->private;
 683         private->init_cqr_status = init_cqr->status;
 684         dasd_sfree_request(init_cqr, device);
 685         dasd_kick_device(device);
 686 }
 687
 688 static int
 689 dasd_eckd_start_analysis(struct dasd_device *device)
 690 {
 691         struct dasd_eckd_private *private;
 692         struct dasd_ccw_req *init_cqr;
 693
 694         private = (struct dasd_eckd_private *) device->private;
 695         init_cqr = dasd_eckd_analysis_ccw(device);
 696         if (IS_ERR(init_cqr))
 697                 return PTR_ERR(init_cqr);
 698         init_cqr->callback = dasd_eckd_analysis_callback;
 699         init_cqr->callback_data = NULL;
 700         init_cqr->expires = 5*HZ;
 701         dasd_add_request_head(init_cqr);
 702         return -EAGAIN;
 703 }
 704
 705 static int
 706 dasd_eckd_end_analysis(struct dasd_device *device)
 707 {
 708         struct dasd_eckd_private *private;
 709         struct eckd_count *count_area;
 710         unsigned int sb, blk_per_trk;
 711         int status, i;
 712
 713         private = (struct dasd_eckd_private *) device->private;
 714         status = private->init_cqr_status;
 715         private->init_cqr_status = -1;
 716         if (status != DASD_CQR_DONE) {
 717                 DEV_MESSAGE(KERN_WARNING, device, "%s",
 718                             "volume analysis returned unformatted disk");
 719                 return -EMEDIUMTYPE;
 720         }
 721
 722         private->uses_cdl = 1;
 723         /* Calculate number of blocks/records per track. */
 724         blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block);
 725         /* Check Track 0 for Compatible Disk Layout */
 726         count_area = NULL;
 727         for (i = 0; i < 3; i++) {
 728                 if (private->count_area[i].kl != 4 ||
 729                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
 730                         private->uses_cdl = 0;
 731                         break;
 732                 }
 733         }
 734         if (i == 3)
 735                 count_area = &private->count_area[4];
 736
 737         if (private->uses_cdl == 0) {
 738                 for (i = 0; i < 5; i++) {
 739                         if ((private->count_area[i].kl != 0) ||
 740                             (private->count_area[i].dl !=
 741                              private->count_area[0].dl))
 742                                 break;
 743                 }
 744                 if (i == 5)
 745                         count_area = &private->count_area[0];
 746         } else {
 747                 if (private->count_area[3].record == 1)
 748                         DEV_MESSAGE(KERN_WARNING, device, "%s",
 749                                     "Trk 0: no records after VTOC!");
 750         }
 751         if (count_area != NULL && count_area->kl == 0) {
 752                 /* we found notthing violating our disk layout */
 753                 if (dasd_check_blocksize(count_area->dl) == 0)
 754                         device->bp_block = count_area->dl;
 755         }
 756         if (device->bp_block == 0) {
 757                 DEV_MESSAGE(KERN_WARNING, device, "%s",
 758                             "Volume has incompatible disk layout");
 759                 return -EMEDIUMTYPE;
 760         }
 761         device->s2b_shift = 0;  /* bits to shift 512 to get a block */
 762         for (sb = 512; sb < device->bp_block; sb = sb << 1)
 763                 device->s2b_shift++;
 764
 765         blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block);
 766         device->blocks = (private->rdc_data.no_cyl *
 767                           private->rdc_data.trk_per_cyl *
 768                           blk_per_trk);
 769
 770         DEV_MESSAGE(KERN_INFO, device,
 771                     "(%dkB blks): %dkB at %dkB/trk %s",
 772                     (device->bp_block >> 10),
 773                     ((private->rdc_data.no_cyl *
 774                       private->rdc_data.trk_per_cyl *
 775                       blk_per_trk * (device->bp_block >> 9)) >> 1),
 776                     ((blk_per_trk * device->bp_block) >> 10),
 777                     private->uses_cdl ?
 778                     "compatible disk layout" : "linux disk layout");
 779
 780         return 0;
 781 }
 782
 783 static int
 784 dasd_eckd_do_analysis(struct dasd_device *device)
 785 {
 786         struct dasd_eckd_private *private;
 787
 788         private = (struct dasd_eckd_private *) device->private;
 789         if (private->init_cqr_status < 0)
 790                 return dasd_eckd_start_analysis(device);
 791         else
 792                 return dasd_eckd_end_analysis(device);
 793 }
 794
 795 static int
 796 dasd_eckd_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
 797 {
 798         struct dasd_eckd_private *private;
 799
 800         private = (struct dasd_eckd_private *) device->private;
 801         if (dasd_check_blocksize(device->bp_block) == 0) {
 802                 geo->sectors = recs_per_track(&private->rdc_data,
 803                                               0, device->bp_block);
 804         }
 805         geo->cylinders = private->rdc_data.no_cyl;
 806         geo->heads = private->rdc_data.trk_per_cyl;
 807         return 0;
 808 }
 809
 810 static struct dasd_ccw_req *
 811 dasd_eckd_format_device(struct dasd_device * device,
 812                         struct format_data_t * fdata)
 813 {
 814         struct dasd_eckd_private *private;
 815         struct dasd_ccw_req *fcp;
 816         struct eckd_count *ect;
 817         struct ccw1 *ccw;
 818         void *data;
 819         int rpt, cyl, head;
 820         int cplength, datasize;
 821         int i;
 822
 823         private = (struct dasd_eckd_private *) device->private;
 824         rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
 825         cyl = fdata->start_unit / private->rdc_data.trk_per_cyl;
 826         head = fdata->start_unit % private->rdc_data.trk_per_cyl;
 827
 828         /* Sanity checks. */
 829         if (fdata->start_unit >=
 830             (private->rdc_data.no_cyl * private->rdc_data.trk_per_cyl)) {
 831                 DEV_MESSAGE(KERN_INFO, device, "Track no %d too big!",
 832                             fdata->start_unit);
 833                 return ERR_PTR(-EINVAL);
 834         }
 835         if (fdata->start_unit > fdata->stop_unit) {
 836                 DEV_MESSAGE(KERN_INFO, device, "Track %d reached! ending.",
 837                             fdata->start_unit);
 838                 return ERR_PTR(-EINVAL);
 839         }
 840         if (dasd_check_blocksize(fdata->blksize) != 0) {
 841                 DEV_MESSAGE(KERN_WARNING, device,
 842                             "Invalid blocksize %d...terminating!",
 843                             fdata->blksize);
 844                 return ERR_PTR(-EINVAL);
 845         }
 846
 847         /*
 848          * fdata->intensity is a bit string that tells us what to do:
 849          *   Bit 0: write record zero
 850          *   Bit 1: write home address, currently not supported
 851          *   Bit 2: invalidate tracks
 852          *   Bit 3: use OS/390 compatible disk layout (cdl)
 853          * Only some bit combinations do make sense.
 854          */
 855         switch (fdata->intensity) {
 856         case 0x00:      /* Normal format */
 857         case 0x08:      /* Normal format, use cdl. */
 858                 cplength = 2 + rpt;
 859                 datasize = sizeof(struct DE_eckd_data) +
 860                         sizeof(struct LO_eckd_data) +
 861                         rpt * sizeof(struct eckd_count);
 862                 break;
 863         case 0x01:      /* Write record zero and format track. */
 864         case 0x09:      /* Write record zero and format track, use cdl. */
 865                 cplength = 3 + rpt;
 866                 datasize = sizeof(struct DE_eckd_data) +
 867                         sizeof(struct LO_eckd_data) +
 868                         sizeof(struct eckd_count) +
 869                         rpt * sizeof(struct eckd_count);
 870                 break;
 871         case 0x04:      /* Invalidate track. */
 872         case 0x0c:      /* Invalidate track, use cdl. */
 873                 cplength = 3;
 874                 datasize = sizeof(struct DE_eckd_data) +
 875                         sizeof(struct LO_eckd_data) +
 876                         sizeof(struct eckd_count);
 877                 break;
 878         default:
 879                 DEV_MESSAGE(KERN_WARNING, device, "Invalid flags 0x%x.",
 880                             fdata->intensity);
 881                 return ERR_PTR(-EINVAL);
 882         }
 883         /* Allocate the format ccw request. */
 884         fcp = dasd_smalloc_request(dasd_eckd_discipline.name,
 885                                    cplength, datasize, device);
 886         if (IS_ERR(fcp))
 887                 return fcp;
 888
 889         data = fcp->data;
 890         ccw = fcp->cpaddr;
 891
 892         switch (fdata->intensity & ~0x08) {
 893         case 0x00: /* Normal format. */
 894                 define_extent(ccw++, (struct DE_eckd_data *) data,
 895                               fdata->start_unit, fdata->start_unit,
 896                               DASD_ECKD_CCW_WRITE_CKD, device);
 897                 data += sizeof(struct DE_eckd_data);
 898                 ccw[-1].flags |= CCW_FLAG_CC;
 899                 locate_record(ccw++, (struct LO_eckd_data *) data,
 900                               fdata->start_unit, 0, rpt,
 901                               DASD_ECKD_CCW_WRITE_CKD, device,
 902                               fdata->blksize);
 903                 data += sizeof(struct LO_eckd_data);
 904                 break;
 905         case 0x01: /* Write record zero + format track. */
 906                 define_extent(ccw++, (struct DE_eckd_data *) data,
 907                               fdata->start_unit, fdata->start_unit,
 908                               DASD_ECKD_CCW_WRITE_RECORD_ZERO,
 909                               device);
 910                 data += sizeof(struct DE_eckd_data);
 911                 ccw[-1].flags |= CCW_FLAG_CC;
 912                 locate_record(ccw++, (struct LO_eckd_data *) data,
 913                               fdata->start_unit, 0, rpt + 1,
 914                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
 915                               device->bp_block);
 916                 data += sizeof(struct LO_eckd_data);
 917                 break;
 918         case 0x04: /* Invalidate track. */
 919                 define_extent(ccw++, (struct DE_eckd_data *) data,
 920                               fdata->start_unit, fdata->start_unit,
 921                               DASD_ECKD_CCW_WRITE_CKD, device);
 922                 data += sizeof(struct DE_eckd_data);
 923                 ccw[-1].flags |= CCW_FLAG_CC;
 924                 locate_record(ccw++, (struct LO_eckd_data *) data,
 925                               fdata->start_unit, 0, 1,
 926                               DASD_ECKD_CCW_WRITE_CKD, device, 8);
 927                 data += sizeof(struct LO_eckd_data);
 928                 break;
 929         }
 930         if (fdata->intensity & 0x01) {  /* write record zero */
 931                 ect = (struct eckd_count *) data;
 932                 data += sizeof(struct eckd_count);
 933                 ect->cyl = cyl;
 934                 ect->head = head;
 935                 ect->record = 0;
 936                 ect->kl = 0;
 937                 ect->dl = 8;
 938                 ccw[-1].flags |= CCW_FLAG_CC;
 939                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
 940                 ccw->flags = CCW_FLAG_SLI;
 941                 ccw->count = 8;
 942                 ccw->cda = (__u32)(addr_t) ect;
 943                 ccw++;
 944         }
 945         if ((fdata->intensity & ~0x08) & 0x04) {        /* erase track */
 946                 ect = (struct eckd_count *) data;
 947                 data += sizeof(struct eckd_count);
 948                 ect->cyl = cyl;
 949                 ect->head = head;
 950                 ect->record = 1;
 951                 ect->kl = 0;
 952                 ect->dl = 0;
 953                 ccw[-1].flags |= CCW_FLAG_CC;
 954                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
 955                 ccw->flags = CCW_FLAG_SLI;
 956                 ccw->count = 8;
 957                 ccw->cda = (__u32)(addr_t) ect;
 958         } else {                /* write remaining records */
 959                 for (i = 0; i < rpt; i++) {
 960                         ect = (struct eckd_count *) data;
 961                         data += sizeof(struct eckd_count);
 962                         ect->cyl = cyl;
 963                         ect->head = head;
 964                         ect->record = i + 1;
 965                         ect->kl = 0;
 966                         ect->dl = fdata->blksize;
 967                         /* Check for special tracks 0-1 when formatting CDL */
 968                         if ((fdata->intensity & 0x08) &&
 969                             fdata->start_unit == 0) {
 970                                 if (i < 3) {
 971                                         ect->kl = 4;
 972                                         ect->dl = sizes_trk0[i] - 4;
 973                                 }
 974                         }
 975                         if ((fdata->intensity & 0x08) &&
 976                             fdata->start_unit == 1) {
 977                                 ect->kl = 44;
 978                                 ect->dl = LABEL_SIZE - 44;
 979                         }
 980                         ccw[-1].flags |= CCW_FLAG_CC;
 981                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
 982                         ccw->flags = CCW_FLAG_SLI;
 983                         ccw->count = 8;
 984                         ccw->cda = (__u32)(addr_t) ect;
 985                         ccw++;
 986                 }
 987         }
 988         fcp->device = device;
 989         fcp->retries = 2;       /* set retry counter to enable ERP */
 990         fcp->buildclk = get_clock();
 991         fcp->status = DASD_CQR_FILLED;
 992         return fcp;
 993 }
 994
 995 static dasd_era_t
 996 dasd_eckd_examine_error(struct dasd_ccw_req * cqr, struct irb * irb)
 997 {
 998         struct dasd_device *device = (struct dasd_device *) cqr->device;
 999         struct ccw_device *cdev = device->cdev;
1000
1001         if (irb->scsw.cstat == 0x00 &&
1002             irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
1003                 return dasd_era_none;
1004
1005         switch (cdev->id.cu_type) {
1006         case 0x3990:
1007         case 0x2105:
1008         case 0x2107:
1009         case 0x1750:
1010                 return dasd_3990_erp_examine(cqr, irb);
1011         case 0x9343:
1012                 return dasd_9343_erp_examine(cqr, irb);
1013         case 0x3880:
1014         default:
1015                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1016                             "default (unknown CU type) - RECOVERABLE return");
1017                 return dasd_era_recover;
1018         }
1019 }
1020
1021 static dasd_erp_fn_t
1022 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
1023 {
1024         struct dasd_device *device = (struct dasd_device *) cqr->device;
1025         struct ccw_device *cdev = device->cdev;
1026
1027         switch (cdev->id.cu_type) {
1028         case 0x3990:
1029         case 0x2105:
1030         case 0x2107:
1031         case 0x1750:
1032                 return dasd_3990_erp_action;
1033         case 0x9343:
1034         case 0x3880:
1035         default:
1036                 return dasd_default_erp_action;
1037         }
1038 }
1039
1040 static dasd_erp_fn_t
1041 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
1042 {
1043         return dasd_default_erp_postaction;
1044 }
1045
1046 static struct dasd_ccw_req *
1047 dasd_eckd_build_cp(struct dasd_device * device, struct request *req)
1048 {
1049         struct dasd_eckd_private *private;
1050         unsigned long *idaws;
1051         struct LO_eckd_data *LO_data;
1052         struct dasd_ccw_req *cqr;
1053         struct ccw1 *ccw;
1054         struct bio *bio;
1055         struct bio_vec *bv;
1056         char *dst;
1057         unsigned int blksize, blk_per_trk, off;
1058         int count, cidaw, cplength, datasize;
1059         sector_t recid, first_rec, last_rec;
1060         sector_t first_trk, last_trk;
1061         unsigned int first_offs, last_offs;
1062         unsigned char cmd, rcmd;
1063         int i;
1064
1065         private = (struct dasd_eckd_private *) device->private;
1066         if (rq_data_dir(req) == READ)
1067                 cmd = DASD_ECKD_CCW_READ_MT;
1068         else if (rq_data_dir(req) == WRITE)
1069                 cmd = DASD_ECKD_CCW_WRITE_MT;
1070         else
1071                 return ERR_PTR(-EINVAL);
1072         /* Calculate number of blocks/records per track. */
1073         blksize = device->bp_block;
1074         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
1075         /* Calculate record id of first and last block. */
1076         first_rec = first_trk = req->sector >> device->s2b_shift;
1077         first_offs = sector_div(first_trk, blk_per_trk);
1078         last_rec = last_trk =
1079                 (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
1080         last_offs = sector_div(last_trk, blk_per_trk);
1081         /* Check struct bio and count the number of blocks for the request. */
1082         count = 0;
1083         cidaw = 0;
1084         rq_for_each_bio(bio, req) {
1085                 bio_for_each_segment(bv, bio, i) {
1086                         if (bv->bv_len & (blksize - 1))
1087                                 /* Eckd can only do full blocks. */
1088                                 return ERR_PTR(-EINVAL);
1089                         count += bv->bv_len >> (device->s2b_shift + 9);
1090 #if defined(CONFIG_64BIT)
1091                         if (idal_is_needed (page_address(bv->bv_page),
1092                                             bv->bv_len))
1093                                 cidaw += bv->bv_len >> (device->s2b_shift + 9);
1094 #endif
1095                 }
1096         }
1097         /* Paranoia. */
1098         if (count != last_rec - first_rec + 1)
1099                 return ERR_PTR(-EINVAL);
1100         /* 1x define extent + 1x locate record + number of blocks */
1101         cplength = 2 + count;
1102         /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
1103         datasize = sizeof(struct DE_eckd_data) + sizeof(struct LO_eckd_data) +
1104                 cidaw * sizeof(unsigned long);
1105         /* Find out the number of additional locate record ccws for cdl. */
1106         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
1107                 if (last_rec >= 2*blk_per_trk)
1108                         count = 2*blk_per_trk - first_rec;
1109                 cplength += count;
1110                 datasize += count*sizeof(struct LO_eckd_data);
1111         }
1112         /* Allocate the ccw request. */
1113         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1114                                    cplength, datasize, device);
1115         if (IS_ERR(cqr))
1116                 return cqr;
1117         ccw = cqr->cpaddr;
1118         /* First ccw is define extent. */
1119         define_extent(ccw++, cqr->data, first_trk, last_trk, cmd, device);
1120         /* Build locate_record+read/write/ccws. */
1121         idaws = (unsigned long *) (cqr->data + sizeof(struct DE_eckd_data));
1122         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
1123         recid = first_rec;
1124         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
1125                 /* Only standard blocks so there is just one locate record. */
1126                 ccw[-1].flags |= CCW_FLAG_CC;
1127                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
1128                               last_rec - recid + 1, cmd, device, blksize);
1129         }
1130         rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
1131                 dst = page_address(bv->bv_page) + bv->bv_offset;
1132                 if (dasd_page_cache) {
1133                         char *copy = kmem_cache_alloc(dasd_page_cache,
1134                                                       SLAB_DMA | __GFP_NOWARN);
1135                         if (copy && rq_data_dir(req) == WRITE)
1136                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
1137                         if (copy)
1138                                 dst = copy + bv->bv_offset;
1139                 }
1140                 for (off = 0; off < bv->bv_len; off += blksize) {
1141                         sector_t trkid = recid;
1142                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
1143                         rcmd = cmd;
1144                         count = blksize;
1145                         /* Locate record for cdl special block ? */
1146                         if (private->uses_cdl && recid < 2*blk_per_trk) {
1147                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
1148                                         rcmd |= 0x8;
1149                                         count = dasd_eckd_cdl_reclen(recid);
1150                                         if (count < blksize &&
1151                                             rq_data_dir(req) == READ)
1152                                                 memset(dst + count, 0xe5,
1153                                                        blksize - count);
1154                                 }
1155                                 ccw[-1].flags |= CCW_FLAG_CC;
1156                                 locate_record(ccw++, LO_data++,
1157                                               trkid, recoffs + 1,
1158                                               1, rcmd, device, count);
1159                         }
1160                         /* Locate record for standard blocks ? */
1161                         if (private->uses_cdl && recid == 2*blk_per_trk) {
1162                                 ccw[-1].flags |= CCW_FLAG_CC;
1163                                 locate_record(ccw++, LO_data++,
1164                                               trkid, recoffs + 1,
1165                                               last_rec - recid + 1,
1166                                               cmd, device, count);
1167                         }
1168                         /* Read/write ccw. */
1169                         ccw[-1].flags |= CCW_FLAG_CC;
1170                         ccw->cmd_code = rcmd;
1171                         ccw->count = count;
1172                         if (idal_is_needed(dst, blksize)) {
1173                                 ccw->cda = (__u32)(addr_t) idaws;
1174                                 ccw->flags = CCW_FLAG_IDA;
1175                                 idaws = idal_create_words(idaws, dst, blksize);
1176                         } else {
1177                                 ccw->cda = (__u32)(addr_t) dst;
1178                                 ccw->flags = 0;
1179                         }
1180                         ccw++;
1181                         dst += blksize;
1182                         recid++;
1183                 }
1184         }
1185         if (req->flags & REQ_FAILFAST)
1186                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1187         cqr->device = device;
1188         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
1189         cqr->lpm = private->path_data.ppm;
1190         cqr->retries = 256;
1191         cqr->buildclk = get_clock();
1192         cqr->status = DASD_CQR_FILLED;
1193         return cqr;
1194 }
1195
1196 static int
1197 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
1198 {
1199         struct dasd_eckd_private *private;
1200         struct ccw1 *ccw;
1201         struct bio *bio;
1202         struct bio_vec *bv;
1203         char *dst, *cda;
1204         unsigned int blksize, blk_per_trk, off;
1205         sector_t recid;
1206         int i, status;
1207
1208         if (!dasd_page_cache)
1209                 goto out;
1210         private = (struct dasd_eckd_private *) cqr->device->private;
1211         blksize = cqr->device->bp_block;
1212         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
1213         recid = req->sector >> cqr->device->s2b_shift;
1214         ccw = cqr->cpaddr;
1215         /* Skip over define extent & locate record. */
1216         ccw++;
1217         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
1218                 ccw++;
1219         rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
1220                 dst = page_address(bv->bv_page) + bv->bv_offset;
1221                 for (off = 0; off < bv->bv_len; off += blksize) {
1222                         /* Skip locate record. */
1223                         if (private->uses_cdl && recid <= 2*blk_per_trk)
1224                                 ccw++;
1225                         if (dst) {
1226                                 if (ccw->flags & CCW_FLAG_IDA)
1227                                         cda = *((char **)((addr_t) ccw->cda));
1228                                 else
1229                                         cda = (char *)((addr_t) ccw->cda);
1230                                 if (dst != cda) {
1231                                         if (rq_data_dir(req) == READ)
1232                                                 memcpy(dst, cda, bv->bv_len);
1233                                         kmem_cache_free(dasd_page_cache,
1234                                             (void *)((addr_t)cda & PAGE_MASK));
1235                                 }
1236                                 dst = NULL;
1237                         }
1238                         ccw++;
1239                         recid++;
1240                 }
1241         }
1242 out:
1243         status = cqr->status == DASD_CQR_DONE;
1244         dasd_sfree_request(cqr, cqr->device);
1245         return status;
1246 }
1247
1248 static int
1249 dasd_eckd_fill_info(struct dasd_device * device,
1250                     struct dasd_information2_t * info)
1251 {
1252         struct dasd_eckd_private *private;
1253
1254         private = (struct dasd_eckd_private *) device->private;
1255         info->label_block = 2;
1256         info->FBA_layout = private->uses_cdl ? 0 : 1;
1257         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
1258         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
1259         memcpy(info->characteristics, &private->rdc_data,
1260                sizeof(struct dasd_eckd_characteristics));
1261         info->confdata_size = sizeof (struct dasd_eckd_confdata);
1262         memcpy(info->configuration_data, &private->conf_data,
1263                sizeof (struct dasd_eckd_confdata));
1264         return 0;
1265 }
1266
1267 /*
1268  * SECTION: ioctl functions for eckd devices.
1269  */
1270
1271 /*
1272  * Release device ioctl.
1273  * Buils a channel programm to releases a prior reserved
1274  * (see dasd_eckd_reserve) device.
1275  */
1276 static int
1277 dasd_eckd_release(struct dasd_device *device)
1278 {
1279         struct dasd_ccw_req *cqr;
1280         int rc;
1281
1282         if (!capable(CAP_SYS_ADMIN))
1283                 return -EACCES;
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_RELEASE;
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         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1299         cqr->retries = 0;
1300         cqr->expires = 2 * HZ;
1301         cqr->buildclk = get_clock();
1302         cqr->status = DASD_CQR_FILLED;
1303
1304         rc = dasd_sleep_on_immediatly(cqr);
1305
1306         dasd_sfree_request(cqr, cqr->device);
1307         return rc;
1308 }
1309
1310 /*
1311  * Reserve device ioctl.
1312  * Options are set to 'synchronous wait for interrupt' and
1313  * 'timeout the request'. This leads to a terminate IO if
1314  * the interrupt is outstanding for a certain time.
1315  */
1316 static int
1317 dasd_eckd_reserve(struct dasd_device *device)
1318 {
1319         struct dasd_ccw_req *cqr;
1320         int rc;
1321
1322         if (!capable(CAP_SYS_ADMIN))
1323                 return -EACCES;
1324
1325         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1326                                    1, 32, device);
1327         if (IS_ERR(cqr)) {
1328                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1329                             "Could not allocate initialization request");
1330                 return PTR_ERR(cqr);
1331         }
1332         cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RESERVE;
1333         cqr->cpaddr->flags |= CCW_FLAG_SLI;
1334         cqr->cpaddr->count = 32;
1335         cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1336         cqr->device = device;
1337         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1338         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1339         cqr->retries = 0;
1340         cqr->expires = 2 * HZ;
1341         cqr->buildclk = get_clock();
1342         cqr->status = DASD_CQR_FILLED;
1343
1344         rc = dasd_sleep_on_immediatly(cqr);
1345
1346         dasd_sfree_request(cqr, cqr->device);
1347         return rc;
1348 }
1349
1350 /*
1351  * Steal lock ioctl - unconditional reserve device.
1352  * Buils a channel programm to break a device's reservation.
1353  * (unconditional reserve)
1354  */
1355 static int
1356 dasd_eckd_steal_lock(struct dasd_device *device)
1357 {
1358         struct dasd_ccw_req *cqr;
1359         int rc;
1360
1361         if (!capable(CAP_SYS_ADMIN))
1362                 return -EACCES;
1363
1364         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1365                                    1, 32, device);
1366         if (IS_ERR(cqr)) {
1367                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1368                             "Could not allocate initialization request");
1369                 return PTR_ERR(cqr);
1370         }
1371         cqr->cpaddr->cmd_code = DASD_ECKD_CCW_SLCK;
1372         cqr->cpaddr->flags |= CCW_FLAG_SLI;
1373         cqr->cpaddr->count = 32;
1374         cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1375         cqr->device = device;
1376         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1377         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1378         cqr->retries = 0;
1379         cqr->expires = 2 * HZ;
1380         cqr->buildclk = get_clock();
1381         cqr->status = DASD_CQR_FILLED;
1382
1383         rc = dasd_sleep_on_immediatly(cqr);
1384
1385         dasd_sfree_request(cqr, cqr->device);
1386         return rc;
1387 }
1388
1389 /*
1390  * Read performance statistics
1391  */
1392 static int
1393 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
1394 {
1395         struct dasd_psf_prssd_data *prssdp;
1396         struct dasd_rssd_perf_stats_t *stats;
1397         struct dasd_ccw_req *cqr;
1398         struct ccw1 *ccw;
1399         int rc;
1400
1401         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1402                                    1 /* PSF */  + 1 /* RSSD */ ,
1403                                    (sizeof (struct dasd_psf_prssd_data) +
1404                                     sizeof (struct dasd_rssd_perf_stats_t)),
1405                                    device);
1406         if (IS_ERR(cqr)) {
1407                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1408                             "Could not allocate initialization request");
1409                 return PTR_ERR(cqr);
1410         }
1411         cqr->device = device;
1412         cqr->retries = 0;
1413         cqr->expires = 10 * HZ;
1414
1415         /* Prepare for Read Subsystem Data */
1416         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1417         memset(prssdp, 0, sizeof (struct dasd_psf_prssd_data));
1418         prssdp->order = PSF_ORDER_PRSSD;
1419         prssdp->suborder = 0x01;        /* Perfomance Statistics */
1420         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
1421
1422         ccw = cqr->cpaddr;
1423         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1424         ccw->count = sizeof (struct dasd_psf_prssd_data);
1425         ccw->flags |= CCW_FLAG_CC;
1426         ccw->cda = (__u32)(addr_t) prssdp;
1427
1428         /* Read Subsystem Data - Performance Statistics */
1429         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
1430         memset(stats, 0, sizeof (struct dasd_rssd_perf_stats_t));
1431
1432         ccw++;
1433         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1434         ccw->count = sizeof (struct dasd_rssd_perf_stats_t);
1435         ccw->cda = (__u32)(addr_t) stats;
1436
1437         cqr->buildclk = get_clock();
1438         cqr->status = DASD_CQR_FILLED;
1439         rc = dasd_sleep_on(cqr);
1440         if (rc == 0) {
1441                 /* Prepare for Read Subsystem Data */
1442                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1443                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
1444                 if (copy_to_user(argp, stats,
1445                                  sizeof(struct dasd_rssd_perf_stats_t)))
1446                         rc = -EFAULT;
1447         }
1448         dasd_sfree_request(cqr, cqr->device);
1449         return rc;
1450 }
1451
1452 /*
1453  * Get attributes (cache operations)
1454  * Returnes the cache attributes used in Define Extend (DE).
1455  */
1456 static int
1457 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
1458 {
1459         struct dasd_eckd_private *private =
1460                 (struct dasd_eckd_private *)device->private;
1461         struct attrib_data_t attrib = private->attrib;
1462         int rc;
1463
1464         if (!capable(CAP_SYS_ADMIN))
1465                 return -EACCES;
1466         if (!argp)
1467                 return -EINVAL;
1468
1469         rc = 0;
1470         if (copy_to_user(argp, (long *) &attrib,
1471                          sizeof (struct attrib_data_t)))
1472                 rc = -EFAULT;
1473
1474         return rc;
1475 }
1476
1477 /*
1478  * Set attributes (cache operations)
1479  * Stores the attributes for cache operation to be used in Define Extend (DE).
1480  */
1481 static int
1482 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
1483 {
1484         struct dasd_eckd_private *private =
1485                 (struct dasd_eckd_private *)device->private;
1486         struct attrib_data_t attrib;
1487
1488         if (!capable(CAP_SYS_ADMIN))
1489                 return -EACCES;
1490         if (!argp)
1491                 return -EINVAL;
1492
1493         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
1494                 return -EFAULT;
1495         private->attrib = attrib;
1496
1497         DEV_MESSAGE(KERN_INFO, device,
1498                     "cache operation mode set to %x (%i cylinder prestage)",
1499                     private->attrib.operation, private->attrib.nr_cyl);
1500         return 0;
1501 }
1502
1503 static int
1504 dasd_eckd_ioctl(struct dasd_device *device, unsigned int cmd, void __user *argp)
1505 {
1506         switch (cmd) {
1507         case BIODASDGATTR:
1508                 return dasd_eckd_get_attrib(device, argp);
1509         case BIODASDSATTR:
1510                 return dasd_eckd_set_attrib(device, argp);
1511         case BIODASDPSRD:
1512                 return dasd_eckd_performance(device, argp);
1513         case BIODASDRLSE:
1514                 return dasd_eckd_release(device);
1515         case BIODASDRSRV:
1516                 return dasd_eckd_reserve(device);
1517         case BIODASDSLCK:
1518                 return dasd_eckd_steal_lock(device);
1519         default:
1520                 return -ENOIOCTLCMD;
1521         }
1522 }
1523
1524 /*
1525  * Print sense data and related channel program.
1526  * Parts are printed because printk buffer is only 1024 bytes.
1527  */
1528 static void
1529 dasd_eckd_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
1530                      struct irb *irb)
1531 {
1532         char *page;
1533         struct ccw1 *act, *end, *last;
1534         int len, sl, sct, count;
1535
1536         page = (char *) get_zeroed_page(GFP_ATOMIC);
1537         if (page == NULL) {
1538                 DEV_MESSAGE(KERN_ERR, device, " %s",
1539                             "No memory to dump sense data");
1540                 return;
1541         }
1542         len = sprintf(page, KERN_ERR PRINTK_HEADER
1543                       " I/O status report for device %s:\n",
1544                       device->cdev->dev.bus_id);
1545         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1546                        " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
1547                        irb->scsw.cstat, irb->scsw.dstat);
1548         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1549                        " device %s: Failing CCW: %p\n",
1550                        device->cdev->dev.bus_id,
1551                        (void *) (addr_t) irb->scsw.cpa);
1552         if (irb->esw.esw0.erw.cons) {
1553                 for (sl = 0; sl < 4; sl++) {
1554                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1555                                        " Sense(hex) %2d-%2d:",
1556                                        (8 * sl), ((8 * sl) + 7));
1557
1558                         for (sct = 0; sct < 8; sct++) {
1559                                 len += sprintf(page + len, " %02x",
1560                                                irb->ecw[8 * sl + sct]);
1561                         }
1562                         len += sprintf(page + len, "\n");
1563                 }
1564
1565                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
1566                         /* 24 Byte Sense Data */
1567                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1568                                        " 24 Byte: %x MSG %x, "
1569                                        "%s MSGb to SYSOP\n",
1570                                        irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
1571                                        irb->ecw[1] & 0x10 ? "" : "no");
1572                 } else {
1573                         /* 32 Byte Sense Data */
1574                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1575                                        " 32 Byte: Format: %x "
1576                                        "Exception class %x\n",
1577                                        irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
1578                 }
1579         } else {
1580                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1581                                " SORRY - NO VALID SENSE AVAILABLE\n");
1582         }
1583         MESSAGE_LOG(KERN_ERR, "%s",
1584                     page + sizeof(KERN_ERR PRINTK_HEADER));
1585
1586         /* dump the Channel Program */
1587         /* print first CCWs (maximum 8) */
1588         act = req->cpaddr;
1589         for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
1590         end = min(act + 8, last);
1591         len = sprintf(page, KERN_ERR PRINTK_HEADER
1592                       " Related CP in req: %p\n", req);
1593         while (act <= end) {
1594                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1595                                " CCW %p: %08X %08X DAT:",
1596                                act, ((int *) act)[0], ((int *) act)[1]);
1597                 for (count = 0; count < 32 && count < act->count;
1598                      count += sizeof(int))
1599                         len += sprintf(page + len, " %08X",
1600                                        ((int *) (addr_t) act->cda)
1601                                        [(count>>2)]);
1602                 len += sprintf(page + len, "\n");
1603                 act++;
1604         }
1605         MESSAGE_LOG(KERN_ERR, "%s",
1606                     page + sizeof(KERN_ERR PRINTK_HEADER));
1607
1608         /* print failing CCW area */
1609         len = 0;
1610         if (act <  ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2) {
1611                 act = ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2;
1612                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
1613         }
1614         end = min((struct ccw1 *)(addr_t) irb->scsw.cpa + 2, last);
1615         while (act <= end) {
1616                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1617                                " CCW %p: %08X %08X DAT:",
1618                                act, ((int *) act)[0], ((int *) act)[1]);
1619                 for (count = 0; count < 32 && count < act->count;
1620                      count += sizeof(int))
1621                         len += sprintf(page + len, " %08X",
1622                                        ((int *) (addr_t) act->cda)
1623                                        [(count>>2)]);
1624                 len += sprintf(page + len, "\n");
1625                 act++;
1626         }
1627
1628         /* print last CCWs */
1629         if (act <  last - 2) {
1630                 act = last - 2;
1631                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
1632         }
1633         while (act <= last) {
1634                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1635                                " CCW %p: %08X %08X DAT:",
1636                                act, ((int *) act)[0], ((int *) act)[1]);
1637                 for (count = 0; count < 32 && count < act->count;
1638                      count += sizeof(int))
1639                         len += sprintf(page + len, " %08X",
1640                                        ((int *) (addr_t) act->cda)
1641                                        [(count>>2)]);
1642                 len += sprintf(page + len, "\n");
1643                 act++;
1644         }
1645         if (len > 0)
1646                 MESSAGE_LOG(KERN_ERR, "%s",
1647                             page + sizeof(KERN_ERR PRINTK_HEADER));
1648         free_page((unsigned long) page);
1649 }
1650
1651 /*
1652  * max_blocks is dependent on the amount of storage that is available
1653  * in the static io buffer for each device. Currently each device has
1654  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
1655  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
1656  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
1657  * addition we have one define extent ccw + 16 bytes of data and one
1658  * locate record ccw + 16 bytes of data. That makes:
1659  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
1660  * We want to fit two into the available memory so that we can immediately
1661  * start the next request if one finishes off. That makes 249.5 blocks
1662  * for one request. Give a little safety and the result is 240.
1663  */
1664 static struct dasd_discipline dasd_eckd_discipline = {
1665         .owner = THIS_MODULE,
1666         .name = "ECKD",
1667         .ebcname = "ECKD",
1668         .max_blocks = 240,
1669         .check_device = dasd_eckd_check_characteristics,
1670         .do_analysis = dasd_eckd_do_analysis,
1671         .fill_geometry = dasd_eckd_fill_geometry,
1672         .start_IO = dasd_start_IO,
1673         .term_IO = dasd_term_IO,
1674         .format_device = dasd_eckd_format_device,
1675         .examine_error = dasd_eckd_examine_error,
1676         .erp_action = dasd_eckd_erp_action,
1677         .erp_postaction = dasd_eckd_erp_postaction,
1678         .build_cp = dasd_eckd_build_cp,
1679         .free_cp = dasd_eckd_free_cp,
1680         .dump_sense = dasd_eckd_dump_sense,
1681         .fill_info = dasd_eckd_fill_info,
1682         .ioctl = dasd_eckd_ioctl,
1683 };
1684
1685 static int __init
1686 dasd_eckd_init(void)
1687 {
1688         int ret;
1689
1690         ASCEBC(dasd_eckd_discipline.ebcname, 4);
1691
1692         ret = ccw_driver_register(&dasd_eckd_driver);
1693         if (!ret)
1694                 dasd_generic_auto_online(&dasd_eckd_driver);
1695         return ret;
1696 }
1697
1698 static void __exit
1699 dasd_eckd_cleanup(void)
1700 {
1701         ccw_driver_unregister(&dasd_eckd_driver);
1702 }
1703
1704 module_init(dasd_eckd_init);
1705 module_exit(dasd_eckd_cleanup);
1706
1707 /*
1708  * Overrides for Emacs so that we follow Linus's tabbing style.
1709  * Emacs will notice this stuff at the end of the file and automatically
1710  * adjust the settings for this buffer only.  This must remain at the end
1711  * of the file.
1712  * ---------------------------------------------------------------------------
1713  * Local variables:
1714  * c-indent-level: 4
1715  * c-brace-imaginary-offset: 0
1716  * c-brace-offset: -4
1717  * c-argdecl-indent: 4
1718  * c-label-offset: -4
1719  * c-continued-statement-offset: 4
1720  * c-continued-brace-offset: 0
1721  * indent-tabs-mode: 1
1722  * tab-width: 8
1723  * End:
1724  */