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   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_eckd.c
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5  *                  Carsten Otte <Cotte@de.ibm.com>
   6  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  * Bugreports.to..: <Linux390@de.ibm.com>
   8  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
   9  *
  10  */
  11
  12 #include <linux/stddef.h>
  13 #include <linux/kernel.h>
  14 #include <linux/slab.h>
  15 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  16 #include <linux/bio.h>
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19
  20 #include <asm/debug.h>
  21 #include <asm/idals.h>
  22 #include <asm/ebcdic.h>
  23 #include <asm/io.h>
  24 #include <asm/todclk.h>
  25 #include <asm/uaccess.h>
  26 #include <asm/cio.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         /* set ECKD specific ccw-device options */
  93         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE);
  94         if (ret) {
  95                 printk(KERN_WARNING
  96                        "dasd_eckd_probe: could not set ccw-device options "
  97                        "for %s\n", cdev->dev.bus_id);
  98                 return ret;
  99         }
 100         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
 101         return ret;
 102 }
 103
 104 static int
 105 dasd_eckd_set_online(struct ccw_device *cdev)
 106 {
 107         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
 108 }
 109
 110 static struct ccw_driver dasd_eckd_driver = {
 111         .name        = "dasd-eckd",
 112         .owner       = THIS_MODULE,
 113         .ids         = dasd_eckd_ids,
 114         .probe       = dasd_eckd_probe,
 115         .remove      = dasd_generic_remove,
 116         .set_offline = dasd_generic_set_offline,
 117         .set_online  = dasd_eckd_set_online,
 118         .notify      = dasd_generic_notify,
 119 };
 120
 121 static const int sizes_trk0[] = { 28, 148, 84 };
 122 #define LABEL_SIZE 140
 123
 124 static inline unsigned int
 125 round_up_multiple(unsigned int no, unsigned int mult)
 126 {
 127         int rem = no % mult;
 128         return (rem ? no - rem + mult : no);
 129 }
 130
 131 static inline unsigned int
 132 ceil_quot(unsigned int d1, unsigned int d2)
 133 {
 134         return (d1 + (d2 - 1)) / d2;
 135 }
 136
 137 static unsigned int
 138 recs_per_track(struct dasd_eckd_characteristics * rdc,
 139                unsigned int kl, unsigned int dl)
 140 {
 141         int dn, kn;
 142
 143         switch (rdc->dev_type) {
 144         case 0x3380:
 145                 if (kl)
 146                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 147                                        ceil_quot(dl + 12, 32));
 148                 else
 149                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 150         case 0x3390:
 151                 dn = ceil_quot(dl + 6, 232) + 1;
 152                 if (kl) {
 153                         kn = ceil_quot(kl + 6, 232) + 1;
 154                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 155                                        9 + ceil_quot(dl + 6 * dn, 34));
 156                 } else
 157                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 158         case 0x9345:
 159                 dn = ceil_quot(dl + 6, 232) + 1;
 160                 if (kl) {
 161                         kn = ceil_quot(kl + 6, 232) + 1;
 162                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 163                                        ceil_quot(dl + 6 * dn, 34));
 164                 } else
 165                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 166         }
 167         return 0;
 168 }
 169
 170 static int
 171 check_XRC (struct ccw1         *de_ccw,
 172            struct DE_eckd_data *data,
 173            struct dasd_device  *device)
 174 {
 175         struct dasd_eckd_private *private;
 176         int rc;
 177
 178         private = (struct dasd_eckd_private *) device->private;
 179         if (!private->rdc_data.facilities.XRC_supported)
 180                 return 0;
 181
 182         /* switch on System Time Stamp - needed for XRC Support */
 183         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 184         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 185
 186         rc = get_sync_clock(&data->ep_sys_time);
 187         /* Ignore return code if sync clock is switched off. */
 188         if (rc == -ENOSYS || rc == -EACCES)
 189                 rc = 0;
 190
 191         de_ccw->count = sizeof (struct DE_eckd_data);
 192         de_ccw->flags |= CCW_FLAG_SLI;
 193         return rc;
 194 }
 195
 196 static int
 197 define_extent(struct ccw1 * ccw, struct DE_eckd_data * data, int trk,
 198               int totrk, int cmd, struct dasd_device * device)
 199 {
 200         struct dasd_eckd_private *private;
 201         struct ch_t geo, beg, end;
 202         int rc = 0;
 203
 204         private = (struct dasd_eckd_private *) device->private;
 205
 206         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 207         ccw->flags = 0;
 208         ccw->count = 16;
 209         ccw->cda = (__u32) __pa(data);
 210
 211         memset(data, 0, sizeof (struct DE_eckd_data));
 212         switch (cmd) {
 213         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 214         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 215         case DASD_ECKD_CCW_READ:
 216         case DASD_ECKD_CCW_READ_MT:
 217         case DASD_ECKD_CCW_READ_CKD:
 218         case DASD_ECKD_CCW_READ_CKD_MT:
 219         case DASD_ECKD_CCW_READ_KD:
 220         case DASD_ECKD_CCW_READ_KD_MT:
 221         case DASD_ECKD_CCW_READ_COUNT:
 222                 data->mask.perm = 0x1;
 223                 data->attributes.operation = private->attrib.operation;
 224                 break;
 225         case DASD_ECKD_CCW_WRITE:
 226         case DASD_ECKD_CCW_WRITE_MT:
 227         case DASD_ECKD_CCW_WRITE_KD:
 228         case DASD_ECKD_CCW_WRITE_KD_MT:
 229                 data->mask.perm = 0x02;
 230                 data->attributes.operation = private->attrib.operation;
 231                 rc = check_XRC (ccw, data, device);
 232                 break;
 233         case DASD_ECKD_CCW_WRITE_CKD:
 234         case DASD_ECKD_CCW_WRITE_CKD_MT:
 235                 data->attributes.operation = DASD_BYPASS_CACHE;
 236                 rc = check_XRC (ccw, data, device);
 237                 break;
 238         case DASD_ECKD_CCW_ERASE:
 239         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 240         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 241                 data->mask.perm = 0x3;
 242                 data->mask.auth = 0x1;
 243                 data->attributes.operation = DASD_BYPASS_CACHE;
 244                 rc = check_XRC (ccw, data, device);
 245                 break;
 246         default:
 247                 DEV_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", cmd);
 248                 break;
 249         }
 250
 251         data->attributes.mode = 0x3;    /* ECKD */
 252
 253         if ((private->rdc_data.cu_type == 0x2105 ||
 254              private->rdc_data.cu_type == 0x2107 ||
 255              private->rdc_data.cu_type == 0x1750)
 256             && !(private->uses_cdl && trk < 2))
 257                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 258
 259         geo.cyl = private->rdc_data.no_cyl;
 260         geo.head = private->rdc_data.trk_per_cyl;
 261         beg.cyl = trk / geo.head;
 262         beg.head = trk % geo.head;
 263         end.cyl = totrk / geo.head;
 264         end.head = totrk % geo.head;
 265
 266         /* check for sequential prestage - enhance cylinder range */
 267         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 268             data->attributes.operation == DASD_SEQ_ACCESS) {
 269
 270                 if (end.cyl + private->attrib.nr_cyl < geo.cyl)
 271                         end.cyl += private->attrib.nr_cyl;
 272                 else
 273                         end.cyl = (geo.cyl - 1);
 274         }
 275
 276         data->beg_ext.cyl = beg.cyl;
 277         data->beg_ext.head = beg.head;
 278         data->end_ext.cyl = end.cyl;
 279         data->end_ext.head = end.head;
 280         return rc;
 281 }
 282
 283 static void
 284 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, int trk,
 285               int rec_on_trk, int no_rec, int cmd,
 286               struct dasd_device * device, int reclen)
 287 {
 288         struct dasd_eckd_private *private;
 289         int sector;
 290         int dn, d;
 291
 292         private = (struct dasd_eckd_private *) device->private;
 293
 294         DBF_DEV_EVENT(DBF_INFO, device,
 295                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 296                   trk, rec_on_trk, no_rec, cmd, reclen);
 297
 298         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 299         ccw->flags = 0;
 300         ccw->count = 16;
 301         ccw->cda = (__u32) __pa(data);
 302
 303         memset(data, 0, sizeof (struct LO_eckd_data));
 304         sector = 0;
 305         if (rec_on_trk) {
 306                 switch (private->rdc_data.dev_type) {
 307                 case 0x3390:
 308                         dn = ceil_quot(reclen + 6, 232);
 309                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 310                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 311                         break;
 312                 case 0x3380:
 313                         d = 7 + ceil_quot(reclen + 12, 32);
 314                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 315                         break;
 316                 }
 317         }
 318         data->sector = sector;
 319         data->count = no_rec;
 320         switch (cmd) {
 321         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 322                 data->operation.orientation = 0x3;
 323                 data->operation.operation = 0x03;
 324                 break;
 325         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 326                 data->operation.orientation = 0x3;
 327                 data->operation.operation = 0x16;
 328                 break;
 329         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 330                 data->operation.orientation = 0x1;
 331                 data->operation.operation = 0x03;
 332                 data->count++;
 333                 break;
 334         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 335                 data->operation.orientation = 0x3;
 336                 data->operation.operation = 0x16;
 337                 data->count++;
 338                 break;
 339         case DASD_ECKD_CCW_WRITE:
 340         case DASD_ECKD_CCW_WRITE_MT:
 341         case DASD_ECKD_CCW_WRITE_KD:
 342         case DASD_ECKD_CCW_WRITE_KD_MT:
 343                 data->auxiliary.last_bytes_used = 0x1;
 344                 data->length = reclen;
 345                 data->operation.operation = 0x01;
 346                 break;
 347         case DASD_ECKD_CCW_WRITE_CKD:
 348         case DASD_ECKD_CCW_WRITE_CKD_MT:
 349                 data->auxiliary.last_bytes_used = 0x1;
 350                 data->length = reclen;
 351                 data->operation.operation = 0x03;
 352                 break;
 353         case DASD_ECKD_CCW_READ:
 354         case DASD_ECKD_CCW_READ_MT:
 355         case DASD_ECKD_CCW_READ_KD:
 356         case DASD_ECKD_CCW_READ_KD_MT:
 357                 data->auxiliary.last_bytes_used = 0x1;
 358                 data->length = reclen;
 359                 data->operation.operation = 0x06;
 360                 break;
 361         case DASD_ECKD_CCW_READ_CKD:
 362         case DASD_ECKD_CCW_READ_CKD_MT:
 363                 data->auxiliary.last_bytes_used = 0x1;
 364                 data->length = reclen;
 365                 data->operation.operation = 0x16;
 366                 break;
 367         case DASD_ECKD_CCW_READ_COUNT:
 368                 data->operation.operation = 0x06;
 369                 break;
 370         case DASD_ECKD_CCW_ERASE:
 371                 data->length = reclen;
 372                 data->auxiliary.last_bytes_used = 0x1;
 373                 data->operation.operation = 0x0b;
 374                 break;
 375         default:
 376                 DEV_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", cmd);
 377         }
 378         data->seek_addr.cyl = data->search_arg.cyl =
 379                 trk / private->rdc_data.trk_per_cyl;
 380         data->seek_addr.head = data->search_arg.head =
 381                 trk % private->rdc_data.trk_per_cyl;
 382         data->search_arg.record = rec_on_trk;
 383 }
 384
 385 /*
 386  * Returns 1 if the block is one of the special blocks that needs
 387  * to get read/written with the KD variant of the command.
 388  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 389  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 390  * Luckily the KD variants differ only by one bit (0x08) from the
 391  * normal variant. So don't wonder about code like:
 392  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 393  *         ccw->cmd_code |= 0x8;
 394  */
 395 static inline int
 396 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 397 {
 398         if (recid < 3)
 399                 return 1;
 400         if (recid < blk_per_trk)
 401                 return 0;
 402         if (recid < 2 * blk_per_trk)
 403                 return 1;
 404         return 0;
 405 }
 406
 407 /*
 408  * Returns the record size for the special blocks of the cdl format.
 409  * Only returns something useful if dasd_eckd_cdl_special is true
 410  * for the recid.
 411  */
 412 static inline int
 413 dasd_eckd_cdl_reclen(int recid)
 414 {
 415         if (recid < 3)
 416                 return sizes_trk0[recid];
 417         return LABEL_SIZE;
 418 }
 419
 420 /*
 421  * Generate device unique id that specifies the physical device.
 422  */
 423 static int
 424 dasd_eckd_generate_uid(struct dasd_device *device, struct dasd_uid *uid)
 425 {
 426         struct dasd_eckd_private *private;
 427         struct dasd_eckd_confdata *confdata;
 428
 429         private = (struct dasd_eckd_private *) device->private;
 430         if (!private)
 431                 return -ENODEV;
 432         confdata = &private->conf_data;
 433         if (!confdata)
 434                 return -ENODEV;
 435
 436         memset(uid, 0, sizeof(struct dasd_uid));
 437         memcpy(uid->vendor, confdata->ned1.HDA_manufacturer,
 438                sizeof(uid->vendor) - 1);
 439         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 440         memcpy(uid->serial, confdata->ned1.HDA_location,
 441                sizeof(uid->serial) - 1);
 442         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 443         uid->ssid = confdata->neq.subsystemID;
 444         if (confdata->ned2.sneq.flags == 0x40) {
 445                 uid->alias = 1;
 446                 uid->unit_addr = confdata->ned2.sneq.base_unit_addr;
 447         } else
 448                 uid->unit_addr = confdata->ned1.unit_addr;
 449
 450         return 0;
 451 }
 452
 453 static int
 454 dasd_eckd_read_conf(struct dasd_device *device)
 455 {
 456         void *conf_data;
 457         int conf_len, conf_data_saved;
 458         int rc;
 459         __u8 lpm;
 460         struct dasd_eckd_private *private;
 461         struct dasd_eckd_path *path_data;
 462
 463         private = (struct dasd_eckd_private *) device->private;
 464         path_data = (struct dasd_eckd_path *) &private->path_data;
 465         path_data->opm = ccw_device_get_path_mask(device->cdev);
 466         lpm = 0x80;
 467         conf_data_saved = 0;
 468
 469         /* get configuration data per operational path */
 470         for (lpm = 0x80; lpm; lpm>>= 1) {
 471                 if (lpm & path_data->opm){
 472                         rc = read_conf_data_lpm(device->cdev, &conf_data,
 473                                                 &conf_len, lpm);
 474                         if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
 475                                 MESSAGE(KERN_WARNING,
 476                                         "Read configuration data returned "
 477                                         "error %d", rc);
 478                                 return rc;
 479                         }
 480                         if (conf_data == NULL) {
 481                                 MESSAGE(KERN_WARNING, "%s", "No configuration "
 482                                         "data retrieved");
 483                                 continue;       /* no errror */
 484                         }
 485                         if (conf_len != sizeof (struct dasd_eckd_confdata)) {
 486                                 MESSAGE(KERN_WARNING,
 487                                         "sizes of configuration data mismatch"
 488                                         "%d (read) vs %ld (expected)",
 489                                         conf_len,
 490                                         sizeof (struct dasd_eckd_confdata));
 491                                 kfree(conf_data);
 492                                 continue;       /* no errror */
 493                         }
 494                         /* save first valid configuration data */
 495                         if (!conf_data_saved){
 496                                 memcpy(&private->conf_data, conf_data,
 497                                        sizeof (struct dasd_eckd_confdata));
 498                                 conf_data_saved++;
 499                         }
 500                         switch (((char *)conf_data)[242] & 0x07){
 501                         case 0x02:
 502                                 path_data->npm |= lpm;
 503                                 break;
 504                         case 0x03:
 505                                 path_data->ppm |= lpm;
 506                                 break;
 507                         }
 508                         kfree(conf_data);
 509                 }
 510         }
 511         return 0;
 512 }
 513
 514 /*
 515  * Build CP for Perform Subsystem Function - SSC.
 516  */
 517 static struct dasd_ccw_req *
 518 dasd_eckd_build_psf_ssc(struct dasd_device *device)
 519 {
 520        struct dasd_ccw_req *cqr;
 521        struct dasd_psf_ssc_data *psf_ssc_data;
 522        struct ccw1 *ccw;
 523
 524        cqr = dasd_smalloc_request("ECKD", 1 /* PSF */ ,
 525                                   sizeof(struct dasd_psf_ssc_data),
 526                                   device);
 527
 528        if (IS_ERR(cqr)) {
 529                DEV_MESSAGE(KERN_WARNING, device, "%s",
 530                            "Could not allocate PSF-SSC request");
 531                return cqr;
 532        }
 533        psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
 534        psf_ssc_data->order = PSF_ORDER_SSC;
 535        psf_ssc_data->suborder = 0x08;
 536
 537        ccw = cqr->cpaddr;
 538        ccw->cmd_code = DASD_ECKD_CCW_PSF;
 539        ccw->cda = (__u32)(addr_t)psf_ssc_data;
 540        ccw->count = 66;
 541
 542        cqr->device = device;
 543        cqr->expires = 10*HZ;
 544        cqr->buildclk = get_clock();
 545        cqr->status = DASD_CQR_FILLED;
 546        return cqr;
 547 }
 548
 549 /*
 550  * Perform Subsystem Function.
 551  * It is necessary to trigger CIO for channel revalidation since this
 552  * call might change behaviour of DASD devices.
 553  */
 554 static int
 555 dasd_eckd_psf_ssc(struct dasd_device *device)
 556 {
 557        struct dasd_ccw_req *cqr;
 558        int rc;
 559
 560        cqr = dasd_eckd_build_psf_ssc(device);
 561        if (IS_ERR(cqr))
 562                return PTR_ERR(cqr);
 563
 564        rc = dasd_sleep_on(cqr);
 565        if (!rc)
 566                /* trigger CIO to reprobe devices */
 567                css_schedule_reprobe();
 568        dasd_sfree_request(cqr, cqr->device);
 569        return rc;
 570 }
 571
 572 /*
 573  * Valide storage server of current device.
 574  */
 575 static int
 576 dasd_eckd_validate_server(struct dasd_device *device, struct dasd_uid *uid)
 577 {
 578         int rc;
 579
 580         /* Currently PAV is the only reason to 'validate' server on LPAR */
 581         if (dasd_nopav || MACHINE_IS_VM)
 582                 return 0;
 583
 584         rc = dasd_eckd_psf_ssc(device);
 585         /* may be requested feature is not available on server,
 586          * therefore just report error and go ahead */
 587         DEV_MESSAGE(KERN_INFO, device,
 588                     "PSF-SSC on storage subsystem %s.%s.%04x returned rc=%d",
 589                     uid->vendor, uid->serial, uid->ssid, rc);
 590         /* RE-Read Configuration Data */
 591         return dasd_eckd_read_conf(device);
 592 }
 593
 594 /*
 595  * Check device characteristics.
 596  * If the device is accessible using ECKD discipline, the device is enabled.
 597  */
 598 static int
 599 dasd_eckd_check_characteristics(struct dasd_device *device)
 600 {
 601         struct dasd_eckd_private *private;
 602         struct dasd_uid uid;
 603         void *rdc_data;
 604         int rc;
 605
 606         private = (struct dasd_eckd_private *) device->private;
 607         if (private == NULL) {
 608                 private = kzalloc(sizeof(struct dasd_eckd_private),
 609                                   GFP_KERNEL | GFP_DMA);
 610                 if (private == NULL) {
 611                         DEV_MESSAGE(KERN_WARNING, device, "%s",
 612                                     "memory allocation failed for private "
 613                                     "data");
 614                         return -ENOMEM;
 615                 }
 616                 device->private = (void *) private;
 617         }
 618         /* Invalidate status of initial analysis. */
 619         private->init_cqr_status = -1;
 620         /* Set default cache operations. */
 621         private->attrib.operation = DASD_NORMAL_CACHE;
 622         private->attrib.nr_cyl = 0;
 623
 624         /* Read Configuration Data */
 625         rc = dasd_eckd_read_conf(device);
 626         if (rc)
 627                 return rc;
 628
 629         /* Generate device unique id and register in devmap */
 630         rc = dasd_eckd_generate_uid(device, &uid);
 631         if (rc)
 632                 return rc;
 633         rc = dasd_set_uid(device->cdev, &uid);
 634         if (rc == 1)    /* new server found */
 635                 rc = dasd_eckd_validate_server(device, &uid);
 636         if (rc)
 637                 return rc;
 638
 639         /* Read Device Characteristics */
 640         rdc_data = (void *) &(private->rdc_data);
 641         memset(rdc_data, 0, sizeof(rdc_data));
 642         rc = read_dev_chars(device->cdev, &rdc_data, 64);
 643         if (rc)
 644                 DEV_MESSAGE(KERN_WARNING, device,
 645                             "Read device characteristics returned "
 646                             "rc=%d", rc);
 647
 648         DEV_MESSAGE(KERN_INFO, device,
 649                     "%04X/%02X(CU:%04X/%02X) Cyl:%d Head:%d Sec:%d",
 650                     private->rdc_data.dev_type,
 651                     private->rdc_data.dev_model,
 652                     private->rdc_data.cu_type,
 653                     private->rdc_data.cu_model.model,
 654                     private->rdc_data.no_cyl,
 655                     private->rdc_data.trk_per_cyl,
 656                     private->rdc_data.sec_per_trk);
 657         return rc;
 658 }
 659
 660 static struct dasd_ccw_req *
 661 dasd_eckd_analysis_ccw(struct dasd_device *device)
 662 {
 663         struct dasd_eckd_private *private;
 664         struct eckd_count *count_data;
 665         struct LO_eckd_data *LO_data;
 666         struct dasd_ccw_req *cqr;
 667         struct ccw1 *ccw;
 668         int cplength, datasize;
 669         int i;
 670
 671         private = (struct dasd_eckd_private *) device->private;
 672
 673         cplength = 8;
 674         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
 675         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
 676                                    cplength, datasize, device);
 677         if (IS_ERR(cqr))
 678                 return cqr;
 679         ccw = cqr->cpaddr;
 680         /* Define extent for the first 3 tracks. */
 681         define_extent(ccw++, cqr->data, 0, 2,
 682                       DASD_ECKD_CCW_READ_COUNT, device);
 683         LO_data = cqr->data + sizeof (struct DE_eckd_data);
 684         /* Locate record for the first 4 records on track 0. */
 685         ccw[-1].flags |= CCW_FLAG_CC;
 686         locate_record(ccw++, LO_data++, 0, 0, 4,
 687                       DASD_ECKD_CCW_READ_COUNT, device, 0);
 688
 689         count_data = private->count_area;
 690         for (i = 0; i < 4; i++) {
 691                 ccw[-1].flags |= CCW_FLAG_CC;
 692                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
 693                 ccw->flags = 0;
 694                 ccw->count = 8;
 695                 ccw->cda = (__u32)(addr_t) count_data;
 696                 ccw++;
 697                 count_data++;
 698         }
 699
 700         /* Locate record for the first record on track 2. */
 701         ccw[-1].flags |= CCW_FLAG_CC;
 702         locate_record(ccw++, LO_data++, 2, 0, 1,
 703                       DASD_ECKD_CCW_READ_COUNT, device, 0);
 704         /* Read count ccw. */
 705         ccw[-1].flags |= CCW_FLAG_CC;
 706         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
 707         ccw->flags = 0;
 708         ccw->count = 8;
 709         ccw->cda = (__u32)(addr_t) count_data;
 710
 711         cqr->device = device;
 712         cqr->retries = 0;
 713         cqr->buildclk = get_clock();
 714         cqr->status = DASD_CQR_FILLED;
 715         return cqr;
 716 }
 717
 718 /*
 719  * This is the callback function for the init_analysis cqr. It saves
 720  * the status of the initial analysis ccw before it frees it and kicks
 721  * the device to continue the startup sequence. This will call
 722  * dasd_eckd_do_analysis again (if the devices has not been marked
 723  * for deletion in the meantime).
 724  */
 725 static void
 726 dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, void *data)
 727 {
 728         struct dasd_eckd_private *private;
 729         struct dasd_device *device;
 730
 731         device = init_cqr->device;
 732         private = (struct dasd_eckd_private *) device->private;
 733         private->init_cqr_status = init_cqr->status;
 734         dasd_sfree_request(init_cqr, device);
 735         dasd_kick_device(device);
 736 }
 737
 738 static int
 739 dasd_eckd_start_analysis(struct dasd_device *device)
 740 {
 741         struct dasd_eckd_private *private;
 742         struct dasd_ccw_req *init_cqr;
 743
 744         private = (struct dasd_eckd_private *) device->private;
 745         init_cqr = dasd_eckd_analysis_ccw(device);
 746         if (IS_ERR(init_cqr))
 747                 return PTR_ERR(init_cqr);
 748         init_cqr->callback = dasd_eckd_analysis_callback;
 749         init_cqr->callback_data = NULL;
 750         init_cqr->expires = 5*HZ;
 751         dasd_add_request_head(init_cqr);
 752         return -EAGAIN;
 753 }
 754
 755 static int
 756 dasd_eckd_end_analysis(struct dasd_device *device)
 757 {
 758         struct dasd_eckd_private *private;
 759         struct eckd_count *count_area;
 760         unsigned int sb, blk_per_trk;
 761         int status, i;
 762
 763         private = (struct dasd_eckd_private *) device->private;
 764         status = private->init_cqr_status;
 765         private->init_cqr_status = -1;
 766         if (status != DASD_CQR_DONE) {
 767                 DEV_MESSAGE(KERN_WARNING, device, "%s",
 768                             "volume analysis returned unformatted disk");
 769                 return -EMEDIUMTYPE;
 770         }
 771
 772         private->uses_cdl = 1;
 773         /* Calculate number of blocks/records per track. */
 774         blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block);
 775         /* Check Track 0 for Compatible Disk Layout */
 776         count_area = NULL;
 777         for (i = 0; i < 3; i++) {
 778                 if (private->count_area[i].kl != 4 ||
 779                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
 780                         private->uses_cdl = 0;
 781                         break;
 782                 }
 783         }
 784         if (i == 3)
 785                 count_area = &private->count_area[4];
 786
 787         if (private->uses_cdl == 0) {
 788                 for (i = 0; i < 5; i++) {
 789                         if ((private->count_area[i].kl != 0) ||
 790                             (private->count_area[i].dl !=
 791                              private->count_area[0].dl))
 792                                 break;
 793                 }
 794                 if (i == 5)
 795                         count_area = &private->count_area[0];
 796         } else {
 797                 if (private->count_area[3].record == 1)
 798                         DEV_MESSAGE(KERN_WARNING, device, "%s",
 799                                     "Trk 0: no records after VTOC!");
 800         }
 801         if (count_area != NULL && count_area->kl == 0) {
 802                 /* we found notthing violating our disk layout */
 803                 if (dasd_check_blocksize(count_area->dl) == 0)
 804                         device->bp_block = count_area->dl;
 805         }
 806         if (device->bp_block == 0) {
 807                 DEV_MESSAGE(KERN_WARNING, device, "%s",
 808                             "Volume has incompatible disk layout");
 809                 return -EMEDIUMTYPE;
 810         }
 811         device->s2b_shift = 0;  /* bits to shift 512 to get a block */
 812         for (sb = 512; sb < device->bp_block; sb = sb << 1)
 813                 device->s2b_shift++;
 814
 815         blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block);
 816         device->blocks = (private->rdc_data.no_cyl *
 817                           private->rdc_data.trk_per_cyl *
 818                           blk_per_trk);
 819
 820         DEV_MESSAGE(KERN_INFO, device,
 821                     "(%dkB blks): %dkB at %dkB/trk %s",
 822                     (device->bp_block >> 10),
 823                     ((private->rdc_data.no_cyl *
 824                       private->rdc_data.trk_per_cyl *
 825                       blk_per_trk * (device->bp_block >> 9)) >> 1),
 826                     ((blk_per_trk * device->bp_block) >> 10),
 827                     private->uses_cdl ?
 828                     "compatible disk layout" : "linux disk layout");
 829
 830         return 0;
 831 }
 832
 833 static int
 834 dasd_eckd_do_analysis(struct dasd_device *device)
 835 {
 836         struct dasd_eckd_private *private;
 837
 838         private = (struct dasd_eckd_private *) device->private;
 839         if (private->init_cqr_status < 0)
 840                 return dasd_eckd_start_analysis(device);
 841         else
 842                 return dasd_eckd_end_analysis(device);
 843 }
 844
 845 static int
 846 dasd_eckd_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
 847 {
 848         struct dasd_eckd_private *private;
 849
 850         private = (struct dasd_eckd_private *) device->private;
 851         if (dasd_check_blocksize(device->bp_block) == 0) {
 852                 geo->sectors = recs_per_track(&private->rdc_data,
 853                                               0, device->bp_block);
 854         }
 855         geo->cylinders = private->rdc_data.no_cyl;
 856         geo->heads = private->rdc_data.trk_per_cyl;
 857         return 0;
 858 }
 859
 860 static struct dasd_ccw_req *
 861 dasd_eckd_format_device(struct dasd_device * device,
 862                         struct format_data_t * fdata)
 863 {
 864         struct dasd_eckd_private *private;
 865         struct dasd_ccw_req *fcp;
 866         struct eckd_count *ect;
 867         struct ccw1 *ccw;
 868         void *data;
 869         int rpt, cyl, head;
 870         int cplength, datasize;
 871         int i;
 872
 873         private = (struct dasd_eckd_private *) device->private;
 874         rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
 875         cyl = fdata->start_unit / private->rdc_data.trk_per_cyl;
 876         head = fdata->start_unit % private->rdc_data.trk_per_cyl;
 877
 878         /* Sanity checks. */
 879         if (fdata->start_unit >=
 880             (private->rdc_data.no_cyl * private->rdc_data.trk_per_cyl)) {
 881                 DEV_MESSAGE(KERN_INFO, device, "Track no %d too big!",
 882                             fdata->start_unit);
 883                 return ERR_PTR(-EINVAL);
 884         }
 885         if (fdata->start_unit > fdata->stop_unit) {
 886                 DEV_MESSAGE(KERN_INFO, device, "Track %d reached! ending.",
 887                             fdata->start_unit);
 888                 return ERR_PTR(-EINVAL);
 889         }
 890         if (dasd_check_blocksize(fdata->blksize) != 0) {
 891                 DEV_MESSAGE(KERN_WARNING, device,
 892                             "Invalid blocksize %d...terminating!",
 893                             fdata->blksize);
 894                 return ERR_PTR(-EINVAL);
 895         }
 896
 897         /*
 898          * fdata->intensity is a bit string that tells us what to do:
 899          *   Bit 0: write record zero
 900          *   Bit 1: write home address, currently not supported
 901          *   Bit 2: invalidate tracks
 902          *   Bit 3: use OS/390 compatible disk layout (cdl)
 903          * Only some bit combinations do make sense.
 904          */
 905         switch (fdata->intensity) {
 906         case 0x00:      /* Normal format */
 907         case 0x08:      /* Normal format, use cdl. */
 908                 cplength = 2 + rpt;
 909                 datasize = sizeof(struct DE_eckd_data) +
 910                         sizeof(struct LO_eckd_data) +
 911                         rpt * sizeof(struct eckd_count);
 912                 break;
 913         case 0x01:      /* Write record zero and format track. */
 914         case 0x09:      /* Write record zero and format track, use cdl. */
 915                 cplength = 3 + rpt;
 916                 datasize = sizeof(struct DE_eckd_data) +
 917                         sizeof(struct LO_eckd_data) +
 918                         sizeof(struct eckd_count) +
 919                         rpt * sizeof(struct eckd_count);
 920                 break;
 921         case 0x04:      /* Invalidate track. */
 922         case 0x0c:      /* Invalidate track, use cdl. */
 923                 cplength = 3;
 924                 datasize = sizeof(struct DE_eckd_data) +
 925                         sizeof(struct LO_eckd_data) +
 926                         sizeof(struct eckd_count);
 927                 break;
 928         default:
 929                 DEV_MESSAGE(KERN_WARNING, device, "Invalid flags 0x%x.",
 930                             fdata->intensity);
 931                 return ERR_PTR(-EINVAL);
 932         }
 933         /* Allocate the format ccw request. */
 934         fcp = dasd_smalloc_request(dasd_eckd_discipline.name,
 935                                    cplength, datasize, device);
 936         if (IS_ERR(fcp))
 937                 return fcp;
 938
 939         data = fcp->data;
 940         ccw = fcp->cpaddr;
 941
 942         switch (fdata->intensity & ~0x08) {
 943         case 0x00: /* Normal format. */
 944                 define_extent(ccw++, (struct DE_eckd_data *) data,
 945                               fdata->start_unit, fdata->start_unit,
 946                               DASD_ECKD_CCW_WRITE_CKD, device);
 947                 data += sizeof(struct DE_eckd_data);
 948                 ccw[-1].flags |= CCW_FLAG_CC;
 949                 locate_record(ccw++, (struct LO_eckd_data *) data,
 950                               fdata->start_unit, 0, rpt,
 951                               DASD_ECKD_CCW_WRITE_CKD, device,
 952                               fdata->blksize);
 953                 data += sizeof(struct LO_eckd_data);
 954                 break;
 955         case 0x01: /* Write record zero + format track. */
 956                 define_extent(ccw++, (struct DE_eckd_data *) data,
 957                               fdata->start_unit, fdata->start_unit,
 958                               DASD_ECKD_CCW_WRITE_RECORD_ZERO,
 959                               device);
 960                 data += sizeof(struct DE_eckd_data);
 961                 ccw[-1].flags |= CCW_FLAG_CC;
 962                 locate_record(ccw++, (struct LO_eckd_data *) data,
 963                               fdata->start_unit, 0, rpt + 1,
 964                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
 965                               device->bp_block);
 966                 data += sizeof(struct LO_eckd_data);
 967                 break;
 968         case 0x04: /* Invalidate track. */
 969                 define_extent(ccw++, (struct DE_eckd_data *) data,
 970                               fdata->start_unit, fdata->start_unit,
 971                               DASD_ECKD_CCW_WRITE_CKD, device);
 972                 data += sizeof(struct DE_eckd_data);
 973                 ccw[-1].flags |= CCW_FLAG_CC;
 974                 locate_record(ccw++, (struct LO_eckd_data *) data,
 975                               fdata->start_unit, 0, 1,
 976                               DASD_ECKD_CCW_WRITE_CKD, device, 8);
 977                 data += sizeof(struct LO_eckd_data);
 978                 break;
 979         }
 980         if (fdata->intensity & 0x01) {  /* write record zero */
 981                 ect = (struct eckd_count *) data;
 982                 data += sizeof(struct eckd_count);
 983                 ect->cyl = cyl;
 984                 ect->head = head;
 985                 ect->record = 0;
 986                 ect->kl = 0;
 987                 ect->dl = 8;
 988                 ccw[-1].flags |= CCW_FLAG_CC;
 989                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
 990                 ccw->flags = CCW_FLAG_SLI;
 991                 ccw->count = 8;
 992                 ccw->cda = (__u32)(addr_t) ect;
 993                 ccw++;
 994         }
 995         if ((fdata->intensity & ~0x08) & 0x04) {        /* erase track */
 996                 ect = (struct eckd_count *) data;
 997                 data += sizeof(struct eckd_count);
 998                 ect->cyl = cyl;
 999                 ect->head = head;
1000                 ect->record = 1;
1001                 ect->kl = 0;
1002                 ect->dl = 0;
1003                 ccw[-1].flags |= CCW_FLAG_CC;
1004                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1005                 ccw->flags = CCW_FLAG_SLI;
1006                 ccw->count = 8;
1007                 ccw->cda = (__u32)(addr_t) ect;
1008         } else {                /* write remaining records */
1009                 for (i = 0; i < rpt; i++) {
1010                         ect = (struct eckd_count *) data;
1011                         data += sizeof(struct eckd_count);
1012                         ect->cyl = cyl;
1013                         ect->head = head;
1014                         ect->record = i + 1;
1015                         ect->kl = 0;
1016                         ect->dl = fdata->blksize;
1017                         /* Check for special tracks 0-1 when formatting CDL */
1018                         if ((fdata->intensity & 0x08) &&
1019                             fdata->start_unit == 0) {
1020                                 if (i < 3) {
1021                                         ect->kl = 4;
1022                                         ect->dl = sizes_trk0[i] - 4;
1023                                 }
1024                         }
1025                         if ((fdata->intensity & 0x08) &&
1026                             fdata->start_unit == 1) {
1027                                 ect->kl = 44;
1028                                 ect->dl = LABEL_SIZE - 44;
1029                         }
1030                         ccw[-1].flags |= CCW_FLAG_CC;
1031                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1032                         ccw->flags = CCW_FLAG_SLI;
1033                         ccw->count = 8;
1034                         ccw->cda = (__u32)(addr_t) ect;
1035                         ccw++;
1036                 }
1037         }
1038         fcp->device = device;
1039         fcp->retries = 2;       /* set retry counter to enable ERP */
1040         fcp->buildclk = get_clock();
1041         fcp->status = DASD_CQR_FILLED;
1042         return fcp;
1043 }
1044
1045 static dasd_era_t
1046 dasd_eckd_examine_error(struct dasd_ccw_req * cqr, struct irb * irb)
1047 {
1048         struct dasd_device *device = (struct dasd_device *) cqr->device;
1049         struct ccw_device *cdev = device->cdev;
1050
1051         if (irb->scsw.cstat == 0x00 &&
1052             irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
1053                 return dasd_era_none;
1054
1055         switch (cdev->id.cu_type) {
1056         case 0x3990:
1057         case 0x2105:
1058         case 0x2107:
1059         case 0x1750:
1060                 return dasd_3990_erp_examine(cqr, irb);
1061         case 0x9343:
1062                 return dasd_9343_erp_examine(cqr, irb);
1063         case 0x3880:
1064         default:
1065                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1066                             "default (unknown CU type) - RECOVERABLE return");
1067                 return dasd_era_recover;
1068         }
1069 }
1070
1071 static dasd_erp_fn_t
1072 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
1073 {
1074         struct dasd_device *device = (struct dasd_device *) cqr->device;
1075         struct ccw_device *cdev = device->cdev;
1076
1077         switch (cdev->id.cu_type) {
1078         case 0x3990:
1079         case 0x2105:
1080         case 0x2107:
1081         case 0x1750:
1082                 return dasd_3990_erp_action;
1083         case 0x9343:
1084         case 0x3880:
1085         default:
1086                 return dasd_default_erp_action;
1087         }
1088 }
1089
1090 static dasd_erp_fn_t
1091 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
1092 {
1093         return dasd_default_erp_postaction;
1094 }
1095
1096 static struct dasd_ccw_req *
1097 dasd_eckd_build_cp(struct dasd_device * device, struct request *req)
1098 {
1099         struct dasd_eckd_private *private;
1100         unsigned long *idaws;
1101         struct LO_eckd_data *LO_data;
1102         struct dasd_ccw_req *cqr;
1103         struct ccw1 *ccw;
1104         struct bio *bio;
1105         struct bio_vec *bv;
1106         char *dst;
1107         unsigned int blksize, blk_per_trk, off;
1108         int count, cidaw, cplength, datasize;
1109         sector_t recid, first_rec, last_rec;
1110         sector_t first_trk, last_trk;
1111         unsigned int first_offs, last_offs;
1112         unsigned char cmd, rcmd;
1113         int i;
1114
1115         private = (struct dasd_eckd_private *) device->private;
1116         if (rq_data_dir(req) == READ)
1117                 cmd = DASD_ECKD_CCW_READ_MT;
1118         else if (rq_data_dir(req) == WRITE)
1119                 cmd = DASD_ECKD_CCW_WRITE_MT;
1120         else
1121                 return ERR_PTR(-EINVAL);
1122         /* Calculate number of blocks/records per track. */
1123         blksize = device->bp_block;
1124         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
1125         /* Calculate record id of first and last block. */
1126         first_rec = first_trk = req->sector >> device->s2b_shift;
1127         first_offs = sector_div(first_trk, blk_per_trk);
1128         last_rec = last_trk =
1129                 (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
1130         last_offs = sector_div(last_trk, blk_per_trk);
1131         /* Check struct bio and count the number of blocks for the request. */
1132         count = 0;
1133         cidaw = 0;
1134         rq_for_each_bio(bio, req) {
1135                 bio_for_each_segment(bv, bio, i) {
1136                         if (bv->bv_len & (blksize - 1))
1137                                 /* Eckd can only do full blocks. */
1138                                 return ERR_PTR(-EINVAL);
1139                         count += bv->bv_len >> (device->s2b_shift + 9);
1140 #if defined(CONFIG_64BIT)
1141                         if (idal_is_needed (page_address(bv->bv_page),
1142                                             bv->bv_len))
1143                                 cidaw += bv->bv_len >> (device->s2b_shift + 9);
1144 #endif
1145                 }
1146         }
1147         /* Paranoia. */
1148         if (count != last_rec - first_rec + 1)
1149                 return ERR_PTR(-EINVAL);
1150         /* 1x define extent + 1x locate record + number of blocks */
1151         cplength = 2 + count;
1152         /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
1153         datasize = sizeof(struct DE_eckd_data) + sizeof(struct LO_eckd_data) +
1154                 cidaw * sizeof(unsigned long);
1155         /* Find out the number of additional locate record ccws for cdl. */
1156         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
1157                 if (last_rec >= 2*blk_per_trk)
1158                         count = 2*blk_per_trk - first_rec;
1159                 cplength += count;
1160                 datasize += count*sizeof(struct LO_eckd_data);
1161         }
1162         /* Allocate the ccw request. */
1163         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1164                                    cplength, datasize, device);
1165         if (IS_ERR(cqr))
1166                 return cqr;
1167         ccw = cqr->cpaddr;
1168         /* First ccw is define extent. */
1169         if (define_extent(ccw++, cqr->data, first_trk,
1170                           last_trk, cmd, device) == -EAGAIN) {
1171                 /* Clock not in sync and XRC is enabled. Try again later. */
1172                 dasd_sfree_request(cqr, device);
1173                 return ERR_PTR(-EAGAIN);
1174         }
1175         /* Build locate_record+read/write/ccws. */
1176         idaws = (unsigned long *) (cqr->data + sizeof(struct DE_eckd_data));
1177         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
1178         recid = first_rec;
1179         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
1180                 /* Only standard blocks so there is just one locate record. */
1181                 ccw[-1].flags |= CCW_FLAG_CC;
1182                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
1183                               last_rec - recid + 1, cmd, device, blksize);
1184         }
1185         rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
1186                 dst = page_address(bv->bv_page) + bv->bv_offset;
1187                 if (dasd_page_cache) {
1188                         char *copy = kmem_cache_alloc(dasd_page_cache,
1189                                                       GFP_DMA | __GFP_NOWARN);
1190                         if (copy && rq_data_dir(req) == WRITE)
1191                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
1192                         if (copy)
1193                                 dst = copy + bv->bv_offset;
1194                 }
1195                 for (off = 0; off < bv->bv_len; off += blksize) {
1196                         sector_t trkid = recid;
1197                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
1198                         rcmd = cmd;
1199                         count = blksize;
1200                         /* Locate record for cdl special block ? */
1201                         if (private->uses_cdl && recid < 2*blk_per_trk) {
1202                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
1203                                         rcmd |= 0x8;
1204                                         count = dasd_eckd_cdl_reclen(recid);
1205                                         if (count < blksize &&
1206                                             rq_data_dir(req) == READ)
1207                                                 memset(dst + count, 0xe5,
1208                                                        blksize - count);
1209                                 }
1210                                 ccw[-1].flags |= CCW_FLAG_CC;
1211                                 locate_record(ccw++, LO_data++,
1212                                               trkid, recoffs + 1,
1213                                               1, rcmd, device, count);
1214                         }
1215                         /* Locate record for standard blocks ? */
1216                         if (private->uses_cdl && recid == 2*blk_per_trk) {
1217                                 ccw[-1].flags |= CCW_FLAG_CC;
1218                                 locate_record(ccw++, LO_data++,
1219                                               trkid, recoffs + 1,
1220                                               last_rec - recid + 1,
1221                                               cmd, device, count);
1222                         }
1223                         /* Read/write ccw. */
1224                         ccw[-1].flags |= CCW_FLAG_CC;
1225                         ccw->cmd_code = rcmd;
1226                         ccw->count = count;
1227                         if (idal_is_needed(dst, blksize)) {
1228                                 ccw->cda = (__u32)(addr_t) idaws;
1229                                 ccw->flags = CCW_FLAG_IDA;
1230                                 idaws = idal_create_words(idaws, dst, blksize);
1231                         } else {
1232                                 ccw->cda = (__u32)(addr_t) dst;
1233                                 ccw->flags = 0;
1234                         }
1235                         ccw++;
1236                         dst += blksize;
1237                         recid++;
1238                 }
1239         }
1240         if (req->cmd_flags & REQ_FAILFAST)
1241                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1242         cqr->device = device;
1243         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
1244         cqr->lpm = private->path_data.ppm;
1245         cqr->retries = 256;
1246         cqr->buildclk = get_clock();
1247         cqr->status = DASD_CQR_FILLED;
1248         return cqr;
1249 }
1250
1251 static int
1252 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
1253 {
1254         struct dasd_eckd_private *private;
1255         struct ccw1 *ccw;
1256         struct bio *bio;
1257         struct bio_vec *bv;
1258         char *dst, *cda;
1259         unsigned int blksize, blk_per_trk, off;
1260         sector_t recid;
1261         int i, status;
1262
1263         if (!dasd_page_cache)
1264                 goto out;
1265         private = (struct dasd_eckd_private *) cqr->device->private;
1266         blksize = cqr->device->bp_block;
1267         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
1268         recid = req->sector >> cqr->device->s2b_shift;
1269         ccw = cqr->cpaddr;
1270         /* Skip over define extent & locate record. */
1271         ccw++;
1272         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
1273                 ccw++;
1274         rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
1275                 dst = page_address(bv->bv_page) + bv->bv_offset;
1276                 for (off = 0; off < bv->bv_len; off += blksize) {
1277                         /* Skip locate record. */
1278                         if (private->uses_cdl && recid <= 2*blk_per_trk)
1279                                 ccw++;
1280                         if (dst) {
1281                                 if (ccw->flags & CCW_FLAG_IDA)
1282                                         cda = *((char **)((addr_t) ccw->cda));
1283                                 else
1284                                         cda = (char *)((addr_t) ccw->cda);
1285                                 if (dst != cda) {
1286                                         if (rq_data_dir(req) == READ)
1287                                                 memcpy(dst, cda, bv->bv_len);
1288                                         kmem_cache_free(dasd_page_cache,
1289                                             (void *)((addr_t)cda & PAGE_MASK));
1290                                 }
1291                                 dst = NULL;
1292                         }
1293                         ccw++;
1294                         recid++;
1295                 }
1296         }
1297 out:
1298         status = cqr->status == DASD_CQR_DONE;
1299         dasd_sfree_request(cqr, cqr->device);
1300         return status;
1301 }
1302
1303 static int
1304 dasd_eckd_fill_info(struct dasd_device * device,
1305                     struct dasd_information2_t * info)
1306 {
1307         struct dasd_eckd_private *private;
1308
1309         private = (struct dasd_eckd_private *) device->private;
1310         info->label_block = 2;
1311         info->FBA_layout = private->uses_cdl ? 0 : 1;
1312         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
1313         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
1314         memcpy(info->characteristics, &private->rdc_data,
1315                sizeof(struct dasd_eckd_characteristics));
1316         info->confdata_size = sizeof (struct dasd_eckd_confdata);
1317         memcpy(info->configuration_data, &private->conf_data,
1318                sizeof (struct dasd_eckd_confdata));
1319         return 0;
1320 }
1321
1322 /*
1323  * SECTION: ioctl functions for eckd devices.
1324  */
1325
1326 /*
1327  * Release device ioctl.
1328  * Buils a channel programm to releases a prior reserved
1329  * (see dasd_eckd_reserve) device.
1330  */
1331 static int
1332 dasd_eckd_release(struct dasd_device *device)
1333 {
1334         struct dasd_ccw_req *cqr;
1335         int rc;
1336
1337         if (!capable(CAP_SYS_ADMIN))
1338                 return -EACCES;
1339
1340         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1341                                    1, 32, device);
1342         if (IS_ERR(cqr)) {
1343                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1344                             "Could not allocate initialization request");
1345                 return PTR_ERR(cqr);
1346         }
1347         cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RELEASE;
1348         cqr->cpaddr->flags |= CCW_FLAG_SLI;
1349         cqr->cpaddr->count = 32;
1350         cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1351         cqr->device = device;
1352         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1353         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1354         cqr->retries = 2;       /* set retry counter to enable basic ERP */
1355         cqr->expires = 2 * HZ;
1356         cqr->buildclk = get_clock();
1357         cqr->status = DASD_CQR_FILLED;
1358
1359         rc = dasd_sleep_on_immediatly(cqr);
1360
1361         dasd_sfree_request(cqr, cqr->device);
1362         return rc;
1363 }
1364
1365 /*
1366  * Reserve device ioctl.
1367  * Options are set to 'synchronous wait for interrupt' and
1368  * 'timeout the request'. This leads to a terminate IO if
1369  * the interrupt is outstanding for a certain time.
1370  */
1371 static int
1372 dasd_eckd_reserve(struct dasd_device *device)
1373 {
1374         struct dasd_ccw_req *cqr;
1375         int rc;
1376
1377         if (!capable(CAP_SYS_ADMIN))
1378                 return -EACCES;
1379
1380         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1381                                    1, 32, device);
1382         if (IS_ERR(cqr)) {
1383                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1384                             "Could not allocate initialization request");
1385                 return PTR_ERR(cqr);
1386         }
1387         cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RESERVE;
1388         cqr->cpaddr->flags |= CCW_FLAG_SLI;
1389         cqr->cpaddr->count = 32;
1390         cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1391         cqr->device = device;
1392         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1393         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1394         cqr->retries = 2;       /* set retry counter to enable basic ERP */
1395         cqr->expires = 2 * HZ;
1396         cqr->buildclk = get_clock();
1397         cqr->status = DASD_CQR_FILLED;
1398
1399         rc = dasd_sleep_on_immediatly(cqr);
1400
1401         dasd_sfree_request(cqr, cqr->device);
1402         return rc;
1403 }
1404
1405 /*
1406  * Steal lock ioctl - unconditional reserve device.
1407  * Buils a channel programm to break a device's reservation.
1408  * (unconditional reserve)
1409  */
1410 static int
1411 dasd_eckd_steal_lock(struct dasd_device *device)
1412 {
1413         struct dasd_ccw_req *cqr;
1414         int rc;
1415
1416         if (!capable(CAP_SYS_ADMIN))
1417                 return -EACCES;
1418
1419         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1420                                    1, 32, device);
1421         if (IS_ERR(cqr)) {
1422                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1423                             "Could not allocate initialization request");
1424                 return PTR_ERR(cqr);
1425         }
1426         cqr->cpaddr->cmd_code = DASD_ECKD_CCW_SLCK;
1427         cqr->cpaddr->flags |= CCW_FLAG_SLI;
1428         cqr->cpaddr->count = 32;
1429         cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1430         cqr->device = device;
1431         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1432         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1433         cqr->retries = 2;       /* set retry counter to enable basic ERP */
1434         cqr->expires = 2 * HZ;
1435         cqr->buildclk = get_clock();
1436         cqr->status = DASD_CQR_FILLED;
1437
1438         rc = dasd_sleep_on_immediatly(cqr);
1439
1440         dasd_sfree_request(cqr, cqr->device);
1441         return rc;
1442 }
1443
1444 /*
1445  * Read performance statistics
1446  */
1447 static int
1448 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
1449 {
1450         struct dasd_psf_prssd_data *prssdp;
1451         struct dasd_rssd_perf_stats_t *stats;
1452         struct dasd_ccw_req *cqr;
1453         struct ccw1 *ccw;
1454         int rc;
1455
1456         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1457                                    1 /* PSF */  + 1 /* RSSD */ ,
1458                                    (sizeof (struct dasd_psf_prssd_data) +
1459                                     sizeof (struct dasd_rssd_perf_stats_t)),
1460                                    device);
1461         if (IS_ERR(cqr)) {
1462                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1463                             "Could not allocate initialization request");
1464                 return PTR_ERR(cqr);
1465         }
1466         cqr->device = device;
1467         cqr->retries = 0;
1468         cqr->expires = 10 * HZ;
1469
1470         /* Prepare for Read Subsystem Data */
1471         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1472         memset(prssdp, 0, sizeof (struct dasd_psf_prssd_data));
1473         prssdp->order = PSF_ORDER_PRSSD;
1474         prssdp->suborder = 0x01;        /* Perfomance Statistics */
1475         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
1476
1477         ccw = cqr->cpaddr;
1478         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1479         ccw->count = sizeof (struct dasd_psf_prssd_data);
1480         ccw->flags |= CCW_FLAG_CC;
1481         ccw->cda = (__u32)(addr_t) prssdp;
1482
1483         /* Read Subsystem Data - Performance Statistics */
1484         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
1485         memset(stats, 0, sizeof (struct dasd_rssd_perf_stats_t));
1486
1487         ccw++;
1488         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1489         ccw->count = sizeof (struct dasd_rssd_perf_stats_t);
1490         ccw->cda = (__u32)(addr_t) stats;
1491
1492         cqr->buildclk = get_clock();
1493         cqr->status = DASD_CQR_FILLED;
1494         rc = dasd_sleep_on(cqr);
1495         if (rc == 0) {
1496                 /* Prepare for Read Subsystem Data */
1497                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1498                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
1499                 if (copy_to_user(argp, stats,
1500                                  sizeof(struct dasd_rssd_perf_stats_t)))
1501                         rc = -EFAULT;
1502         }
1503         dasd_sfree_request(cqr, cqr->device);
1504         return rc;
1505 }
1506
1507 /*
1508  * Get attributes (cache operations)
1509  * Returnes the cache attributes used in Define Extend (DE).
1510  */
1511 static int
1512 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
1513 {
1514         struct dasd_eckd_private *private =
1515                 (struct dasd_eckd_private *)device->private;
1516         struct attrib_data_t attrib = private->attrib;
1517         int rc;
1518
1519         if (!capable(CAP_SYS_ADMIN))
1520                 return -EACCES;
1521         if (!argp)
1522                 return -EINVAL;
1523
1524         rc = 0;
1525         if (copy_to_user(argp, (long *) &attrib,
1526                          sizeof (struct attrib_data_t)))
1527                 rc = -EFAULT;
1528
1529         return rc;
1530 }
1531
1532 /*
1533  * Set attributes (cache operations)
1534  * Stores the attributes for cache operation to be used in Define Extend (DE).
1535  */
1536 static int
1537 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
1538 {
1539         struct dasd_eckd_private *private =
1540                 (struct dasd_eckd_private *)device->private;
1541         struct attrib_data_t attrib;
1542
1543         if (!capable(CAP_SYS_ADMIN))
1544                 return -EACCES;
1545         if (!argp)
1546                 return -EINVAL;
1547
1548         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
1549                 return -EFAULT;
1550         private->attrib = attrib;
1551
1552         DEV_MESSAGE(KERN_INFO, device,
1553                     "cache operation mode set to %x (%i cylinder prestage)",
1554                     private->attrib.operation, private->attrib.nr_cyl);
1555         return 0;
1556 }
1557
1558 static int
1559 dasd_eckd_ioctl(struct dasd_device *device, unsigned int cmd, void __user *argp)
1560 {
1561         switch (cmd) {
1562         case BIODASDGATTR:
1563                 return dasd_eckd_get_attrib(device, argp);
1564         case BIODASDSATTR:
1565                 return dasd_eckd_set_attrib(device, argp);
1566         case BIODASDPSRD:
1567                 return dasd_eckd_performance(device, argp);
1568         case BIODASDRLSE:
1569                 return dasd_eckd_release(device);
1570         case BIODASDRSRV:
1571                 return dasd_eckd_reserve(device);
1572         case BIODASDSLCK:
1573                 return dasd_eckd_steal_lock(device);
1574         default:
1575                 return -ENOIOCTLCMD;
1576         }
1577 }
1578
1579 /*
1580  * Dump the range of CCWs into 'page' buffer
1581  * and return number of printed chars.
1582  */
1583 static int
1584 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
1585 {
1586         int len, count;
1587         char *datap;
1588
1589         len = 0;
1590         while (from <= to) {
1591                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1592                                " CCW %p: %08X %08X DAT:",
1593                                from, ((int *) from)[0], ((int *) from)[1]);
1594
1595                 /* get pointer to data (consider IDALs) */
1596                 if (from->flags & CCW_FLAG_IDA)
1597                         datap = (char *) *((addr_t *) (addr_t) from->cda);
1598                 else
1599                         datap = (char *) ((addr_t) from->cda);
1600
1601                 /* dump data (max 32 bytes) */
1602                 for (count = 0; count < from->count && count < 32; count++) {
1603                         if (count % 8 == 0) len += sprintf(page + len, " ");
1604                         if (count % 4 == 0) len += sprintf(page + len, " ");
1605                         len += sprintf(page + len, "%02x", datap[count]);
1606                 }
1607                 len += sprintf(page + len, "\n");
1608                 from++;
1609         }
1610         return len;
1611 }
1612
1613 /*
1614  * Print sense data and related channel program.
1615  * Parts are printed because printk buffer is only 1024 bytes.
1616  */
1617 static void
1618 dasd_eckd_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
1619                      struct irb *irb)
1620 {
1621         char *page;
1622         struct ccw1 *first, *last, *fail, *from, *to;
1623         int len, sl, sct;
1624
1625         page = (char *) get_zeroed_page(GFP_ATOMIC);
1626         if (page == NULL) {
1627                 DEV_MESSAGE(KERN_ERR, device, " %s",
1628                             "No memory to dump sense data");
1629                 return;
1630         }
1631         /* dump the sense data */
1632         len = sprintf(page,  KERN_ERR PRINTK_HEADER
1633                       " I/O status report for device %s:\n",
1634                       device->cdev->dev.bus_id);
1635         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1636                        " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
1637                        irb->scsw.cstat, irb->scsw.dstat);
1638         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1639                        " device %s: Failing CCW: %p\n",
1640                        device->cdev->dev.bus_id,
1641                        (void *) (addr_t) irb->scsw.cpa);
1642         if (irb->esw.esw0.erw.cons) {
1643                 for (sl = 0; sl < 4; sl++) {
1644                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1645                                        " Sense(hex) %2d-%2d:",
1646                                        (8 * sl), ((8 * sl) + 7));
1647
1648                         for (sct = 0; sct < 8; sct++) {
1649                                 len += sprintf(page + len, " %02x",
1650                                                irb->ecw[8 * sl + sct]);
1651                         }
1652                         len += sprintf(page + len, "\n");
1653                 }
1654
1655                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
1656                         /* 24 Byte Sense Data */
1657                         sprintf(page + len, KERN_ERR PRINTK_HEADER
1658                                 " 24 Byte: %x MSG %x, "
1659                                 "%s MSGb to SYSOP\n",
1660                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
1661                                 irb->ecw[1] & 0x10 ? "" : "no");
1662                 } else {
1663                         /* 32 Byte Sense Data */
1664                         sprintf(page + len, KERN_ERR PRINTK_HEADER
1665                                 " 32 Byte: Format: %x "
1666                                 "Exception class %x\n",
1667                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
1668                 }
1669         } else {
1670                 sprintf(page + len, KERN_ERR PRINTK_HEADER
1671                         " SORRY - NO VALID SENSE AVAILABLE\n");
1672         }
1673         printk("%s", page);
1674
1675         /* dump the Channel Program (max 140 Bytes per line) */
1676         /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
1677         first = req->cpaddr;
1678         for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
1679         to = min(first + 6, last);
1680         len = sprintf(page,  KERN_ERR PRINTK_HEADER
1681                       " Related CP in req: %p\n", req);
1682         dasd_eckd_dump_ccw_range(first, to, page + len);
1683         printk("%s", page);
1684
1685         /* print failing CCW area (maximum 4) */
1686         /* scsw->cda is either valid or zero  */
1687         len = 0;
1688         from = ++to;
1689         fail = (struct ccw1 *)(addr_t) irb->scsw.cpa; /* failing CCW */
1690         if (from <  fail - 2) {
1691                 from = fail - 2;     /* there is a gap - print header */
1692                 len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
1693         }
1694         to = min(fail + 1, last);
1695         len += dasd_eckd_dump_ccw_range(from, to, page + len);
1696
1697         /* print last CCWs (maximum 2) */
1698         from = max(from, ++to);
1699         if (from < last - 1) {
1700                 from = last - 1;     /* there is a gap - print header */
1701                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
1702         }
1703         len += dasd_eckd_dump_ccw_range(from, last, page + len);
1704         if (len > 0)
1705                 printk("%s", page);
1706         free_page((unsigned long) page);
1707 }
1708
1709 /*
1710  * max_blocks is dependent on the amount of storage that is available
1711  * in the static io buffer for each device. Currently each device has
1712  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
1713  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
1714  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
1715  * addition we have one define extent ccw + 16 bytes of data and one
1716  * locate record ccw + 16 bytes of data. That makes:
1717  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
1718  * We want to fit two into the available memory so that we can immediately
1719  * start the next request if one finishes off. That makes 249.5 blocks
1720  * for one request. Give a little safety and the result is 240.
1721  */
1722 static struct dasd_discipline dasd_eckd_discipline = {
1723         .owner = THIS_MODULE,
1724         .name = "ECKD",
1725         .ebcname = "ECKD",
1726         .max_blocks = 240,
1727         .check_device = dasd_eckd_check_characteristics,
1728         .do_analysis = dasd_eckd_do_analysis,
1729         .fill_geometry = dasd_eckd_fill_geometry,
1730         .start_IO = dasd_start_IO,
1731         .term_IO = dasd_term_IO,
1732         .format_device = dasd_eckd_format_device,
1733         .examine_error = dasd_eckd_examine_error,
1734         .erp_action = dasd_eckd_erp_action,
1735         .erp_postaction = dasd_eckd_erp_postaction,
1736         .build_cp = dasd_eckd_build_cp,
1737         .free_cp = dasd_eckd_free_cp,
1738         .dump_sense = dasd_eckd_dump_sense,
1739         .fill_info = dasd_eckd_fill_info,
1740         .ioctl = dasd_eckd_ioctl,
1741 };
1742
1743 static int __init
1744 dasd_eckd_init(void)
1745 {
1746         ASCEBC(dasd_eckd_discipline.ebcname, 4);
1747         return ccw_driver_register(&dasd_eckd_driver);
1748 }
1749
1750 static void __exit
1751 dasd_eckd_cleanup(void)
1752 {
1753         ccw_driver_unregister(&dasd_eckd_driver);
1754 }
1755
1756 module_init(dasd_eckd_init);
1757 module_exit(dasd_eckd_cleanup);