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/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 struct dasd_ccw_req *dasd_eckd_build_rcd_lpm(struct dasd_device *device,
 454                                                     void *rcd_buffer,
 455                                                     struct ciw *ciw, __u8 lpm)
 456 {
 457         struct dasd_ccw_req *cqr;
 458         struct ccw1 *ccw;
 459
 460         cqr = dasd_smalloc_request("ECKD", 1 /* RCD */, ciw->count, device);
 461
 462         if (IS_ERR(cqr)) {
 463                 DEV_MESSAGE(KERN_WARNING, device, "%s",
 464                             "Could not allocate RCD request");
 465                 return cqr;
 466         }
 467
 468         ccw = cqr->cpaddr;
 469         ccw->cmd_code = ciw->cmd;
 470         ccw->cda = (__u32)(addr_t)rcd_buffer;
 471         ccw->count = ciw->count;
 472
 473         cqr->device = device;
 474         cqr->expires = 10*HZ;
 475         cqr->lpm = lpm;
 476         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 477         cqr->retries = 2;
 478         cqr->buildclk = get_clock();
 479         cqr->status = DASD_CQR_FILLED;
 480         return cqr;
 481 }
 482
 483 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 484                                    void **rcd_buffer,
 485                                    int *rcd_buffer_size, __u8 lpm)
 486 {
 487         struct ciw *ciw;
 488         char *rcd_buf = NULL;
 489         int ret;
 490         struct dasd_ccw_req *cqr;
 491
 492         /*
 493          * scan for RCD command in extended SenseID data
 494          */
 495         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 496         if (!ciw || ciw->cmd == 0) {
 497                 ret = -EOPNOTSUPP;
 498                 goto out_error;
 499         }
 500         rcd_buf = kzalloc(ciw->count, GFP_KERNEL | GFP_DMA);
 501         if (!rcd_buf) {
 502                 ret = -ENOMEM;
 503                 goto out_error;
 504         }
 505         cqr = dasd_eckd_build_rcd_lpm(device, rcd_buf, ciw, lpm);
 506         if (IS_ERR(cqr)) {
 507                 ret =  PTR_ERR(cqr);
 508                 goto out_error;
 509         }
 510         ret = dasd_sleep_on(cqr);
 511         /*
 512          * on success we update the user input parms
 513          */
 514         dasd_sfree_request(cqr, cqr->device);
 515         if (ret)
 516                 goto out_error;
 517
 518         *rcd_buffer_size = ciw->count;
 519         *rcd_buffer = rcd_buf;
 520         return 0;
 521 out_error:
 522         kfree(rcd_buf);
 523         *rcd_buffer = NULL;
 524         *rcd_buffer_size = 0;
 525         return ret;
 526 }
 527
 528 static int
 529 dasd_eckd_read_conf(struct dasd_device *device)
 530 {
 531         void *conf_data;
 532         int conf_len, conf_data_saved;
 533         int rc;
 534         __u8 lpm;
 535         struct dasd_eckd_private *private;
 536         struct dasd_eckd_path *path_data;
 537
 538         private = (struct dasd_eckd_private *) device->private;
 539         path_data = (struct dasd_eckd_path *) &private->path_data;
 540         path_data->opm = ccw_device_get_path_mask(device->cdev);
 541         lpm = 0x80;
 542         conf_data_saved = 0;
 543
 544         /* get configuration data per operational path */
 545         for (lpm = 0x80; lpm; lpm>>= 1) {
 546                 if (lpm & path_data->opm){
 547                         rc = dasd_eckd_read_conf_lpm(device, &conf_data,
 548                                                      &conf_len, lpm);
 549                         if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
 550                                 MESSAGE(KERN_WARNING,
 551                                         "Read configuration data returned "
 552                                         "error %d", rc);
 553                                 return rc;
 554                         }
 555                         if (conf_data == NULL) {
 556                                 MESSAGE(KERN_WARNING, "%s", "No configuration "
 557                                         "data retrieved");
 558                                 continue;       /* no error */
 559                         }
 560                         if (conf_len != sizeof (struct dasd_eckd_confdata)) {
 561                                 MESSAGE(KERN_WARNING,
 562                                         "sizes of configuration data mismatch"
 563                                         "%d (read) vs %ld (expected)",
 564                                         conf_len,
 565                                         sizeof (struct dasd_eckd_confdata));
 566                                 kfree(conf_data);
 567                                 continue;       /* no error */
 568                         }
 569                         /* save first valid configuration data */
 570                         if (!conf_data_saved){
 571                                 memcpy(&private->conf_data, conf_data,
 572                                        sizeof (struct dasd_eckd_confdata));
 573                                 conf_data_saved++;
 574                         }
 575                         switch (((char *)conf_data)[242] & 0x07){
 576                         case 0x02:
 577                                 path_data->npm |= lpm;
 578                                 break;
 579                         case 0x03:
 580                                 path_data->ppm |= lpm;
 581                                 break;
 582                         }
 583                         kfree(conf_data);
 584                 }
 585         }
 586         return 0;
 587 }
 588
 589 /*
 590  * Build CP for Perform Subsystem Function - SSC.
 591  */
 592 static struct dasd_ccw_req *
 593 dasd_eckd_build_psf_ssc(struct dasd_device *device)
 594 {
 595        struct dasd_ccw_req *cqr;
 596        struct dasd_psf_ssc_data *psf_ssc_data;
 597        struct ccw1 *ccw;
 598
 599        cqr = dasd_smalloc_request("ECKD", 1 /* PSF */ ,
 600                                   sizeof(struct dasd_psf_ssc_data),
 601                                   device);
 602
 603        if (IS_ERR(cqr)) {
 604                DEV_MESSAGE(KERN_WARNING, device, "%s",
 605                            "Could not allocate PSF-SSC request");
 606                return cqr;
 607        }
 608        psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
 609        psf_ssc_data->order = PSF_ORDER_SSC;
 610        psf_ssc_data->suborder = 0x08;
 611
 612        ccw = cqr->cpaddr;
 613        ccw->cmd_code = DASD_ECKD_CCW_PSF;
 614        ccw->cda = (__u32)(addr_t)psf_ssc_data;
 615        ccw->count = 66;
 616
 617        cqr->device = device;
 618        cqr->expires = 10*HZ;
 619        cqr->buildclk = get_clock();
 620        cqr->status = DASD_CQR_FILLED;
 621        return cqr;
 622 }
 623
 624 /*
 625  * Perform Subsystem Function.
 626  * It is necessary to trigger CIO for channel revalidation since this
 627  * call might change behaviour of DASD devices.
 628  */
 629 static int
 630 dasd_eckd_psf_ssc(struct dasd_device *device)
 631 {
 632        struct dasd_ccw_req *cqr;
 633        int rc;
 634
 635        cqr = dasd_eckd_build_psf_ssc(device);
 636        if (IS_ERR(cqr))
 637                return PTR_ERR(cqr);
 638
 639        rc = dasd_sleep_on(cqr);
 640        if (!rc)
 641                /* trigger CIO to reprobe devices */
 642                css_schedule_reprobe();
 643        dasd_sfree_request(cqr, cqr->device);
 644        return rc;
 645 }
 646
 647 /*
 648  * Valide storage server of current device.
 649  */
 650 static int
 651 dasd_eckd_validate_server(struct dasd_device *device, struct dasd_uid *uid)
 652 {
 653         int rc;
 654
 655         /* Currently PAV is the only reason to 'validate' server on LPAR */
 656         if (dasd_nopav || MACHINE_IS_VM)
 657                 return 0;
 658
 659         rc = dasd_eckd_psf_ssc(device);
 660         /* may be requested feature is not available on server,
 661          * therefore just report error and go ahead */
 662         DEV_MESSAGE(KERN_INFO, device,
 663                     "PSF-SSC on storage subsystem %s.%s.%04x returned rc=%d",
 664                     uid->vendor, uid->serial, uid->ssid, rc);
 665         /* RE-Read Configuration Data */
 666         return dasd_eckd_read_conf(device);
 667 }
 668
 669 /*
 670  * Check device characteristics.
 671  * If the device is accessible using ECKD discipline, the device is enabled.
 672  */
 673 static int
 674 dasd_eckd_check_characteristics(struct dasd_device *device)
 675 {
 676         struct dasd_eckd_private *private;
 677         struct dasd_uid uid;
 678         void *rdc_data;
 679         int rc;
 680
 681         private = (struct dasd_eckd_private *) device->private;
 682         if (private == NULL) {
 683                 private = kzalloc(sizeof(struct dasd_eckd_private),
 684                                   GFP_KERNEL | GFP_DMA);
 685                 if (private == NULL) {
 686                         DEV_MESSAGE(KERN_WARNING, device, "%s",
 687                                     "memory allocation failed for private "
 688                                     "data");
 689                         return -ENOMEM;
 690                 }
 691                 device->private = (void *) private;
 692         }
 693         /* Invalidate status of initial analysis. */
 694         private->init_cqr_status = -1;
 695         /* Set default cache operations. */
 696         private->attrib.operation = DASD_NORMAL_CACHE;
 697         private->attrib.nr_cyl = 0;
 698
 699         /* Read Configuration Data */
 700         rc = dasd_eckd_read_conf(device);
 701         if (rc)
 702                 return rc;
 703
 704         /* Generate device unique id and register in devmap */
 705         rc = dasd_eckd_generate_uid(device, &uid);
 706         if (rc)
 707                 return rc;
 708         rc = dasd_set_uid(device->cdev, &uid);
 709         if (rc == 1)    /* new server found */
 710                 rc = dasd_eckd_validate_server(device, &uid);
 711         if (rc)
 712                 return rc;
 713
 714         /* Read Device Characteristics */
 715         rdc_data = (void *) &(private->rdc_data);
 716         memset(rdc_data, 0, sizeof(rdc_data));
 717         rc = dasd_generic_read_dev_chars(device, "ECKD", &rdc_data, 64);
 718         if (rc)
 719                 DEV_MESSAGE(KERN_WARNING, device,
 720                             "Read device characteristics returned "
 721                             "rc=%d", rc);
 722
 723         DEV_MESSAGE(KERN_INFO, device,
 724                     "%04X/%02X(CU:%04X/%02X) Cyl:%d Head:%d Sec:%d",
 725                     private->rdc_data.dev_type,
 726                     private->rdc_data.dev_model,
 727                     private->rdc_data.cu_type,
 728                     private->rdc_data.cu_model.model,
 729                     private->rdc_data.no_cyl,
 730                     private->rdc_data.trk_per_cyl,
 731                     private->rdc_data.sec_per_trk);
 732         return rc;
 733 }
 734
 735 static struct dasd_ccw_req *
 736 dasd_eckd_analysis_ccw(struct dasd_device *device)
 737 {
 738         struct dasd_eckd_private *private;
 739         struct eckd_count *count_data;
 740         struct LO_eckd_data *LO_data;
 741         struct dasd_ccw_req *cqr;
 742         struct ccw1 *ccw;
 743         int cplength, datasize;
 744         int i;
 745
 746         private = (struct dasd_eckd_private *) device->private;
 747
 748         cplength = 8;
 749         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
 750         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
 751                                    cplength, datasize, device);
 752         if (IS_ERR(cqr))
 753                 return cqr;
 754         ccw = cqr->cpaddr;
 755         /* Define extent for the first 3 tracks. */
 756         define_extent(ccw++, cqr->data, 0, 2,
 757                       DASD_ECKD_CCW_READ_COUNT, device);
 758         LO_data = cqr->data + sizeof (struct DE_eckd_data);
 759         /* Locate record for the first 4 records on track 0. */
 760         ccw[-1].flags |= CCW_FLAG_CC;
 761         locate_record(ccw++, LO_data++, 0, 0, 4,
 762                       DASD_ECKD_CCW_READ_COUNT, device, 0);
 763
 764         count_data = private->count_area;
 765         for (i = 0; i < 4; i++) {
 766                 ccw[-1].flags |= CCW_FLAG_CC;
 767                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
 768                 ccw->flags = 0;
 769                 ccw->count = 8;
 770                 ccw->cda = (__u32)(addr_t) count_data;
 771                 ccw++;
 772                 count_data++;
 773         }
 774
 775         /* Locate record for the first record on track 2. */
 776         ccw[-1].flags |= CCW_FLAG_CC;
 777         locate_record(ccw++, LO_data++, 2, 0, 1,
 778                       DASD_ECKD_CCW_READ_COUNT, device, 0);
 779         /* Read count ccw. */
 780         ccw[-1].flags |= CCW_FLAG_CC;
 781         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
 782         ccw->flags = 0;
 783         ccw->count = 8;
 784         ccw->cda = (__u32)(addr_t) count_data;
 785
 786         cqr->device = device;
 787         cqr->retries = 0;
 788         cqr->buildclk = get_clock();
 789         cqr->status = DASD_CQR_FILLED;
 790         return cqr;
 791 }
 792
 793 /*
 794  * This is the callback function for the init_analysis cqr. It saves
 795  * the status of the initial analysis ccw before it frees it and kicks
 796  * the device to continue the startup sequence. This will call
 797  * dasd_eckd_do_analysis again (if the devices has not been marked
 798  * for deletion in the meantime).
 799  */
 800 static void
 801 dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, void *data)
 802 {
 803         struct dasd_eckd_private *private;
 804         struct dasd_device *device;
 805
 806         device = init_cqr->device;
 807         private = (struct dasd_eckd_private *) device->private;
 808         private->init_cqr_status = init_cqr->status;
 809         dasd_sfree_request(init_cqr, device);
 810         dasd_kick_device(device);
 811 }
 812
 813 static int
 814 dasd_eckd_start_analysis(struct dasd_device *device)
 815 {
 816         struct dasd_eckd_private *private;
 817         struct dasd_ccw_req *init_cqr;
 818
 819         private = (struct dasd_eckd_private *) device->private;
 820         init_cqr = dasd_eckd_analysis_ccw(device);
 821         if (IS_ERR(init_cqr))
 822                 return PTR_ERR(init_cqr);
 823         init_cqr->callback = dasd_eckd_analysis_callback;
 824         init_cqr->callback_data = NULL;
 825         init_cqr->expires = 5*HZ;
 826         dasd_add_request_head(init_cqr);
 827         return -EAGAIN;
 828 }
 829
 830 static int
 831 dasd_eckd_end_analysis(struct dasd_device *device)
 832 {
 833         struct dasd_eckd_private *private;
 834         struct eckd_count *count_area;
 835         unsigned int sb, blk_per_trk;
 836         int status, i;
 837
 838         private = (struct dasd_eckd_private *) device->private;
 839         status = private->init_cqr_status;
 840         private->init_cqr_status = -1;
 841         if (status != DASD_CQR_DONE) {
 842                 DEV_MESSAGE(KERN_WARNING, device, "%s",
 843                             "volume analysis returned unformatted disk");
 844                 return -EMEDIUMTYPE;
 845         }
 846
 847         private->uses_cdl = 1;
 848         /* Calculate number of blocks/records per track. */
 849         blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block);
 850         /* Check Track 0 for Compatible Disk Layout */
 851         count_area = NULL;
 852         for (i = 0; i < 3; i++) {
 853                 if (private->count_area[i].kl != 4 ||
 854                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
 855                         private->uses_cdl = 0;
 856                         break;
 857                 }
 858         }
 859         if (i == 3)
 860                 count_area = &private->count_area[4];
 861
 862         if (private->uses_cdl == 0) {
 863                 for (i = 0; i < 5; i++) {
 864                         if ((private->count_area[i].kl != 0) ||
 865                             (private->count_area[i].dl !=
 866                              private->count_area[0].dl))
 867                                 break;
 868                 }
 869                 if (i == 5)
 870                         count_area = &private->count_area[0];
 871         } else {
 872                 if (private->count_area[3].record == 1)
 873                         DEV_MESSAGE(KERN_WARNING, device, "%s",
 874                                     "Trk 0: no records after VTOC!");
 875         }
 876         if (count_area != NULL && count_area->kl == 0) {
 877                 /* we found notthing violating our disk layout */
 878                 if (dasd_check_blocksize(count_area->dl) == 0)
 879                         device->bp_block = count_area->dl;
 880         }
 881         if (device->bp_block == 0) {
 882                 DEV_MESSAGE(KERN_WARNING, device, "%s",
 883                             "Volume has incompatible disk layout");
 884                 return -EMEDIUMTYPE;
 885         }
 886         device->s2b_shift = 0;  /* bits to shift 512 to get a block */
 887         for (sb = 512; sb < device->bp_block; sb = sb << 1)
 888                 device->s2b_shift++;
 889
 890         blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block);
 891         device->blocks = (private->rdc_data.no_cyl *
 892                           private->rdc_data.trk_per_cyl *
 893                           blk_per_trk);
 894
 895         DEV_MESSAGE(KERN_INFO, device,
 896                     "(%dkB blks): %dkB at %dkB/trk %s",
 897                     (device->bp_block >> 10),
 898                     ((private->rdc_data.no_cyl *
 899                       private->rdc_data.trk_per_cyl *
 900                       blk_per_trk * (device->bp_block >> 9)) >> 1),
 901                     ((blk_per_trk * device->bp_block) >> 10),
 902                     private->uses_cdl ?
 903                     "compatible disk layout" : "linux disk layout");
 904
 905         return 0;
 906 }
 907
 908 static int
 909 dasd_eckd_do_analysis(struct dasd_device *device)
 910 {
 911         struct dasd_eckd_private *private;
 912
 913         private = (struct dasd_eckd_private *) device->private;
 914         if (private->init_cqr_status < 0)
 915                 return dasd_eckd_start_analysis(device);
 916         else
 917                 return dasd_eckd_end_analysis(device);
 918 }
 919
 920 static int
 921 dasd_eckd_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
 922 {
 923         struct dasd_eckd_private *private;
 924
 925         private = (struct dasd_eckd_private *) device->private;
 926         if (dasd_check_blocksize(device->bp_block) == 0) {
 927                 geo->sectors = recs_per_track(&private->rdc_data,
 928                                               0, device->bp_block);
 929         }
 930         geo->cylinders = private->rdc_data.no_cyl;
 931         geo->heads = private->rdc_data.trk_per_cyl;
 932         return 0;
 933 }
 934
 935 static struct dasd_ccw_req *
 936 dasd_eckd_format_device(struct dasd_device * device,
 937                         struct format_data_t * fdata)
 938 {
 939         struct dasd_eckd_private *private;
 940         struct dasd_ccw_req *fcp;
 941         struct eckd_count *ect;
 942         struct ccw1 *ccw;
 943         void *data;
 944         int rpt, cyl, head;
 945         int cplength, datasize;
 946         int i;
 947
 948         private = (struct dasd_eckd_private *) device->private;
 949         rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
 950         cyl = fdata->start_unit / private->rdc_data.trk_per_cyl;
 951         head = fdata->start_unit % private->rdc_data.trk_per_cyl;
 952
 953         /* Sanity checks. */
 954         if (fdata->start_unit >=
 955             (private->rdc_data.no_cyl * private->rdc_data.trk_per_cyl)) {
 956                 DEV_MESSAGE(KERN_INFO, device, "Track no %d too big!",
 957                             fdata->start_unit);
 958                 return ERR_PTR(-EINVAL);
 959         }
 960         if (fdata->start_unit > fdata->stop_unit) {
 961                 DEV_MESSAGE(KERN_INFO, device, "Track %d reached! ending.",
 962                             fdata->start_unit);
 963                 return ERR_PTR(-EINVAL);
 964         }
 965         if (dasd_check_blocksize(fdata->blksize) != 0) {
 966                 DEV_MESSAGE(KERN_WARNING, device,
 967                             "Invalid blocksize %d...terminating!",
 968                             fdata->blksize);
 969                 return ERR_PTR(-EINVAL);
 970         }
 971
 972         /*
 973          * fdata->intensity is a bit string that tells us what to do:
 974          *   Bit 0: write record zero
 975          *   Bit 1: write home address, currently not supported
 976          *   Bit 2: invalidate tracks
 977          *   Bit 3: use OS/390 compatible disk layout (cdl)
 978          * Only some bit combinations do make sense.
 979          */
 980         switch (fdata->intensity) {
 981         case 0x00:      /* Normal format */
 982         case 0x08:      /* Normal format, use cdl. */
 983                 cplength = 2 + rpt;
 984                 datasize = sizeof(struct DE_eckd_data) +
 985                         sizeof(struct LO_eckd_data) +
 986                         rpt * sizeof(struct eckd_count);
 987                 break;
 988         case 0x01:      /* Write record zero and format track. */
 989         case 0x09:      /* Write record zero and format track, use cdl. */
 990                 cplength = 3 + rpt;
 991                 datasize = sizeof(struct DE_eckd_data) +
 992                         sizeof(struct LO_eckd_data) +
 993                         sizeof(struct eckd_count) +
 994                         rpt * sizeof(struct eckd_count);
 995                 break;
 996         case 0x04:      /* Invalidate track. */
 997         case 0x0c:      /* Invalidate track, use cdl. */
 998                 cplength = 3;
 999                 datasize = sizeof(struct DE_eckd_data) +
1000                         sizeof(struct LO_eckd_data) +
1001                         sizeof(struct eckd_count);
1002                 break;
1003         default:
1004                 DEV_MESSAGE(KERN_WARNING, device, "Invalid flags 0x%x.",
1005                             fdata->intensity);
1006                 return ERR_PTR(-EINVAL);
1007         }
1008         /* Allocate the format ccw request. */
1009         fcp = dasd_smalloc_request(dasd_eckd_discipline.name,
1010                                    cplength, datasize, device);
1011         if (IS_ERR(fcp))
1012                 return fcp;
1013
1014         data = fcp->data;
1015         ccw = fcp->cpaddr;
1016
1017         switch (fdata->intensity & ~0x08) {
1018         case 0x00: /* Normal format. */
1019                 define_extent(ccw++, (struct DE_eckd_data *) data,
1020                               fdata->start_unit, fdata->start_unit,
1021                               DASD_ECKD_CCW_WRITE_CKD, device);
1022                 data += sizeof(struct DE_eckd_data);
1023                 ccw[-1].flags |= CCW_FLAG_CC;
1024                 locate_record(ccw++, (struct LO_eckd_data *) data,
1025                               fdata->start_unit, 0, rpt,
1026                               DASD_ECKD_CCW_WRITE_CKD, device,
1027                               fdata->blksize);
1028                 data += sizeof(struct LO_eckd_data);
1029                 break;
1030         case 0x01: /* Write record zero + format track. */
1031                 define_extent(ccw++, (struct DE_eckd_data *) data,
1032                               fdata->start_unit, fdata->start_unit,
1033                               DASD_ECKD_CCW_WRITE_RECORD_ZERO,
1034                               device);
1035                 data += sizeof(struct DE_eckd_data);
1036                 ccw[-1].flags |= CCW_FLAG_CC;
1037                 locate_record(ccw++, (struct LO_eckd_data *) data,
1038                               fdata->start_unit, 0, rpt + 1,
1039                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
1040                               device->bp_block);
1041                 data += sizeof(struct LO_eckd_data);
1042                 break;
1043         case 0x04: /* Invalidate track. */
1044                 define_extent(ccw++, (struct DE_eckd_data *) data,
1045                               fdata->start_unit, fdata->start_unit,
1046                               DASD_ECKD_CCW_WRITE_CKD, device);
1047                 data += sizeof(struct DE_eckd_data);
1048                 ccw[-1].flags |= CCW_FLAG_CC;
1049                 locate_record(ccw++, (struct LO_eckd_data *) data,
1050                               fdata->start_unit, 0, 1,
1051                               DASD_ECKD_CCW_WRITE_CKD, device, 8);
1052                 data += sizeof(struct LO_eckd_data);
1053                 break;
1054         }
1055         if (fdata->intensity & 0x01) {  /* write record zero */
1056                 ect = (struct eckd_count *) data;
1057                 data += sizeof(struct eckd_count);
1058                 ect->cyl = cyl;
1059                 ect->head = head;
1060                 ect->record = 0;
1061                 ect->kl = 0;
1062                 ect->dl = 8;
1063                 ccw[-1].flags |= CCW_FLAG_CC;
1064                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
1065                 ccw->flags = CCW_FLAG_SLI;
1066                 ccw->count = 8;
1067                 ccw->cda = (__u32)(addr_t) ect;
1068                 ccw++;
1069         }
1070         if ((fdata->intensity & ~0x08) & 0x04) {        /* erase track */
1071                 ect = (struct eckd_count *) data;
1072                 data += sizeof(struct eckd_count);
1073                 ect->cyl = cyl;
1074                 ect->head = head;
1075                 ect->record = 1;
1076                 ect->kl = 0;
1077                 ect->dl = 0;
1078                 ccw[-1].flags |= CCW_FLAG_CC;
1079                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1080                 ccw->flags = CCW_FLAG_SLI;
1081                 ccw->count = 8;
1082                 ccw->cda = (__u32)(addr_t) ect;
1083         } else {                /* write remaining records */
1084                 for (i = 0; i < rpt; i++) {
1085                         ect = (struct eckd_count *) data;
1086                         data += sizeof(struct eckd_count);
1087                         ect->cyl = cyl;
1088                         ect->head = head;
1089                         ect->record = i + 1;
1090                         ect->kl = 0;
1091                         ect->dl = fdata->blksize;
1092                         /* Check for special tracks 0-1 when formatting CDL */
1093                         if ((fdata->intensity & 0x08) &&
1094                             fdata->start_unit == 0) {
1095                                 if (i < 3) {
1096                                         ect->kl = 4;
1097                                         ect->dl = sizes_trk0[i] - 4;
1098                                 }
1099                         }
1100                         if ((fdata->intensity & 0x08) &&
1101                             fdata->start_unit == 1) {
1102                                 ect->kl = 44;
1103                                 ect->dl = LABEL_SIZE - 44;
1104                         }
1105                         ccw[-1].flags |= CCW_FLAG_CC;
1106                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1107                         ccw->flags = CCW_FLAG_SLI;
1108                         ccw->count = 8;
1109                         ccw->cda = (__u32)(addr_t) ect;
1110                         ccw++;
1111                 }
1112         }
1113         fcp->device = device;
1114         fcp->retries = 2;       /* set retry counter to enable ERP */
1115         fcp->buildclk = get_clock();
1116         fcp->status = DASD_CQR_FILLED;
1117         return fcp;
1118 }
1119
1120 static dasd_era_t
1121 dasd_eckd_examine_error(struct dasd_ccw_req * cqr, struct irb * irb)
1122 {
1123         struct dasd_device *device = (struct dasd_device *) cqr->device;
1124         struct ccw_device *cdev = device->cdev;
1125
1126         if (irb->scsw.cstat == 0x00 &&
1127             irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
1128                 return dasd_era_none;
1129
1130         switch (cdev->id.cu_type) {
1131         case 0x3990:
1132         case 0x2105:
1133         case 0x2107:
1134         case 0x1750:
1135                 return dasd_3990_erp_examine(cqr, irb);
1136         case 0x9343:
1137                 return dasd_9343_erp_examine(cqr, irb);
1138         case 0x3880:
1139         default:
1140                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1141                             "default (unknown CU type) - RECOVERABLE return");
1142                 return dasd_era_recover;
1143         }
1144 }
1145
1146 static dasd_erp_fn_t
1147 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
1148 {
1149         struct dasd_device *device = (struct dasd_device *) cqr->device;
1150         struct ccw_device *cdev = device->cdev;
1151
1152         switch (cdev->id.cu_type) {
1153         case 0x3990:
1154         case 0x2105:
1155         case 0x2107:
1156         case 0x1750:
1157                 return dasd_3990_erp_action;
1158         case 0x9343:
1159         case 0x3880:
1160         default:
1161                 return dasd_default_erp_action;
1162         }
1163 }
1164
1165 static dasd_erp_fn_t
1166 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
1167 {
1168         return dasd_default_erp_postaction;
1169 }
1170
1171 static struct dasd_ccw_req *
1172 dasd_eckd_build_cp(struct dasd_device * device, struct request *req)
1173 {
1174         struct dasd_eckd_private *private;
1175         unsigned long *idaws;
1176         struct LO_eckd_data *LO_data;
1177         struct dasd_ccw_req *cqr;
1178         struct ccw1 *ccw;
1179         struct req_iterator iter;
1180         struct bio_vec *bv;
1181         char *dst;
1182         unsigned int blksize, blk_per_trk, off;
1183         int count, cidaw, cplength, datasize;
1184         sector_t recid, first_rec, last_rec;
1185         sector_t first_trk, last_trk;
1186         unsigned int first_offs, last_offs;
1187         unsigned char cmd, rcmd;
1188
1189         private = (struct dasd_eckd_private *) device->private;
1190         if (rq_data_dir(req) == READ)
1191                 cmd = DASD_ECKD_CCW_READ_MT;
1192         else if (rq_data_dir(req) == WRITE)
1193                 cmd = DASD_ECKD_CCW_WRITE_MT;
1194         else
1195                 return ERR_PTR(-EINVAL);
1196         /* Calculate number of blocks/records per track. */
1197         blksize = device->bp_block;
1198         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
1199         /* Calculate record id of first and last block. */
1200         first_rec = first_trk = req->sector >> device->s2b_shift;
1201         first_offs = sector_div(first_trk, blk_per_trk);
1202         last_rec = last_trk =
1203                 (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
1204         last_offs = sector_div(last_trk, blk_per_trk);
1205         /* Check struct bio and count the number of blocks for the request. */
1206         count = 0;
1207         cidaw = 0;
1208         rq_for_each_segment(bv, req, iter) {
1209                         if (bv->bv_len & (blksize - 1))
1210                                 /* Eckd can only do full blocks. */
1211                                 return ERR_PTR(-EINVAL);
1212                         count += bv->bv_len >> (device->s2b_shift + 9);
1213 #if defined(CONFIG_64BIT)
1214                         if (idal_is_needed (page_address(bv->bv_page),
1215                                             bv->bv_len))
1216                                 cidaw += bv->bv_len >> (device->s2b_shift + 9);
1217 #endif
1218         }
1219         /* Paranoia. */
1220         if (count != last_rec - first_rec + 1)
1221                 return ERR_PTR(-EINVAL);
1222         /* 1x define extent + 1x locate record + number of blocks */
1223         cplength = 2 + count;
1224         /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
1225         datasize = sizeof(struct DE_eckd_data) + sizeof(struct LO_eckd_data) +
1226                 cidaw * sizeof(unsigned long);
1227         /* Find out the number of additional locate record ccws for cdl. */
1228         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
1229                 if (last_rec >= 2*blk_per_trk)
1230                         count = 2*blk_per_trk - first_rec;
1231                 cplength += count;
1232                 datasize += count*sizeof(struct LO_eckd_data);
1233         }
1234         /* Allocate the ccw request. */
1235         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1236                                    cplength, datasize, device);
1237         if (IS_ERR(cqr))
1238                 return cqr;
1239         ccw = cqr->cpaddr;
1240         /* First ccw is define extent. */
1241         if (define_extent(ccw++, cqr->data, first_trk,
1242                           last_trk, cmd, device) == -EAGAIN) {
1243                 /* Clock not in sync and XRC is enabled. Try again later. */
1244                 dasd_sfree_request(cqr, device);
1245                 return ERR_PTR(-EAGAIN);
1246         }
1247         /* Build locate_record+read/write/ccws. */
1248         idaws = (unsigned long *) (cqr->data + sizeof(struct DE_eckd_data));
1249         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
1250         recid = first_rec;
1251         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
1252                 /* Only standard blocks so there is just one locate record. */
1253                 ccw[-1].flags |= CCW_FLAG_CC;
1254                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
1255                               last_rec - recid + 1, cmd, device, blksize);
1256         }
1257         rq_for_each_segment(bv, req, iter) {
1258                 dst = page_address(bv->bv_page) + bv->bv_offset;
1259                 if (dasd_page_cache) {
1260                         char *copy = kmem_cache_alloc(dasd_page_cache,
1261                                                       GFP_DMA | __GFP_NOWARN);
1262                         if (copy && rq_data_dir(req) == WRITE)
1263                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
1264                         if (copy)
1265                                 dst = copy + bv->bv_offset;
1266                 }
1267                 for (off = 0; off < bv->bv_len; off += blksize) {
1268                         sector_t trkid = recid;
1269                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
1270                         rcmd = cmd;
1271                         count = blksize;
1272                         /* Locate record for cdl special block ? */
1273                         if (private->uses_cdl && recid < 2*blk_per_trk) {
1274                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
1275                                         rcmd |= 0x8;
1276                                         count = dasd_eckd_cdl_reclen(recid);
1277                                         if (count < blksize &&
1278                                             rq_data_dir(req) == READ)
1279                                                 memset(dst + count, 0xe5,
1280                                                        blksize - count);
1281                                 }
1282                                 ccw[-1].flags |= CCW_FLAG_CC;
1283                                 locate_record(ccw++, LO_data++,
1284                                               trkid, recoffs + 1,
1285                                               1, rcmd, device, count);
1286                         }
1287                         /* Locate record for standard blocks ? */
1288                         if (private->uses_cdl && recid == 2*blk_per_trk) {
1289                                 ccw[-1].flags |= CCW_FLAG_CC;
1290                                 locate_record(ccw++, LO_data++,
1291                                               trkid, recoffs + 1,
1292                                               last_rec - recid + 1,
1293                                               cmd, device, count);
1294                         }
1295                         /* Read/write ccw. */
1296                         ccw[-1].flags |= CCW_FLAG_CC;
1297                         ccw->cmd_code = rcmd;
1298                         ccw->count = count;
1299                         if (idal_is_needed(dst, blksize)) {
1300                                 ccw->cda = (__u32)(addr_t) idaws;
1301                                 ccw->flags = CCW_FLAG_IDA;
1302                                 idaws = idal_create_words(idaws, dst, blksize);
1303                         } else {
1304                                 ccw->cda = (__u32)(addr_t) dst;
1305                                 ccw->flags = 0;
1306                         }
1307                         ccw++;
1308                         dst += blksize;
1309                         recid++;
1310                 }
1311         }
1312         if (req->cmd_flags & REQ_FAILFAST)
1313                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1314         cqr->device = device;
1315         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
1316         cqr->lpm = private->path_data.ppm;
1317         cqr->retries = 256;
1318         cqr->buildclk = get_clock();
1319         cqr->status = DASD_CQR_FILLED;
1320         return cqr;
1321 }
1322
1323 static int
1324 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
1325 {
1326         struct dasd_eckd_private *private;
1327         struct ccw1 *ccw;
1328         struct req_iterator iter;
1329         struct bio_vec *bv;
1330         char *dst, *cda;
1331         unsigned int blksize, blk_per_trk, off;
1332         sector_t recid;
1333         int status;
1334
1335         if (!dasd_page_cache)
1336                 goto out;
1337         private = (struct dasd_eckd_private *) cqr->device->private;
1338         blksize = cqr->device->bp_block;
1339         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
1340         recid = req->sector >> cqr->device->s2b_shift;
1341         ccw = cqr->cpaddr;
1342         /* Skip over define extent & locate record. */
1343         ccw++;
1344         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
1345                 ccw++;
1346         rq_for_each_segment(bv, req, iter) {
1347                 dst = page_address(bv->bv_page) + bv->bv_offset;
1348                 for (off = 0; off < bv->bv_len; off += blksize) {
1349                         /* Skip locate record. */
1350                         if (private->uses_cdl && recid <= 2*blk_per_trk)
1351                                 ccw++;
1352                         if (dst) {
1353                                 if (ccw->flags & CCW_FLAG_IDA)
1354                                         cda = *((char **)((addr_t) ccw->cda));
1355                                 else
1356                                         cda = (char *)((addr_t) ccw->cda);
1357                                 if (dst != cda) {
1358                                         if (rq_data_dir(req) == READ)
1359                                                 memcpy(dst, cda, bv->bv_len);
1360                                         kmem_cache_free(dasd_page_cache,
1361                                             (void *)((addr_t)cda & PAGE_MASK));
1362                                 }
1363                                 dst = NULL;
1364                         }
1365                         ccw++;
1366                         recid++;
1367                 }
1368         }
1369 out:
1370         status = cqr->status == DASD_CQR_DONE;
1371         dasd_sfree_request(cqr, cqr->device);
1372         return status;
1373 }
1374
1375 static int
1376 dasd_eckd_fill_info(struct dasd_device * device,
1377                     struct dasd_information2_t * info)
1378 {
1379         struct dasd_eckd_private *private;
1380
1381         private = (struct dasd_eckd_private *) device->private;
1382         info->label_block = 2;
1383         info->FBA_layout = private->uses_cdl ? 0 : 1;
1384         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
1385         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
1386         memcpy(info->characteristics, &private->rdc_data,
1387                sizeof(struct dasd_eckd_characteristics));
1388         info->confdata_size = sizeof (struct dasd_eckd_confdata);
1389         memcpy(info->configuration_data, &private->conf_data,
1390                sizeof (struct dasd_eckd_confdata));
1391         return 0;
1392 }
1393
1394 /*
1395  * SECTION: ioctl functions for eckd devices.
1396  */
1397
1398 /*
1399  * Release device ioctl.
1400  * Buils a channel programm to releases a prior reserved
1401  * (see dasd_eckd_reserve) device.
1402  */
1403 static int
1404 dasd_eckd_release(struct dasd_device *device)
1405 {
1406         struct dasd_ccw_req *cqr;
1407         int rc;
1408
1409         if (!capable(CAP_SYS_ADMIN))
1410                 return -EACCES;
1411
1412         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1413                                    1, 32, device);
1414         if (IS_ERR(cqr)) {
1415                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1416                             "Could not allocate initialization request");
1417                 return PTR_ERR(cqr);
1418         }
1419         cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RELEASE;
1420         cqr->cpaddr->flags |= CCW_FLAG_SLI;
1421         cqr->cpaddr->count = 32;
1422         cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1423         cqr->device = device;
1424         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1425         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1426         cqr->retries = 2;       /* set retry counter to enable basic ERP */
1427         cqr->expires = 2 * HZ;
1428         cqr->buildclk = get_clock();
1429         cqr->status = DASD_CQR_FILLED;
1430
1431         rc = dasd_sleep_on_immediatly(cqr);
1432
1433         dasd_sfree_request(cqr, cqr->device);
1434         return rc;
1435 }
1436
1437 /*
1438  * Reserve device ioctl.
1439  * Options are set to 'synchronous wait for interrupt' and
1440  * 'timeout the request'. This leads to a terminate IO if
1441  * the interrupt is outstanding for a certain time.
1442  */
1443 static int
1444 dasd_eckd_reserve(struct dasd_device *device)
1445 {
1446         struct dasd_ccw_req *cqr;
1447         int rc;
1448
1449         if (!capable(CAP_SYS_ADMIN))
1450                 return -EACCES;
1451
1452         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1453                                    1, 32, device);
1454         if (IS_ERR(cqr)) {
1455                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1456                             "Could not allocate initialization request");
1457                 return PTR_ERR(cqr);
1458         }
1459         cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RESERVE;
1460         cqr->cpaddr->flags |= CCW_FLAG_SLI;
1461         cqr->cpaddr->count = 32;
1462         cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1463         cqr->device = device;
1464         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1465         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1466         cqr->retries = 2;       /* set retry counter to enable basic ERP */
1467         cqr->expires = 2 * HZ;
1468         cqr->buildclk = get_clock();
1469         cqr->status = DASD_CQR_FILLED;
1470
1471         rc = dasd_sleep_on_immediatly(cqr);
1472
1473         dasd_sfree_request(cqr, cqr->device);
1474         return rc;
1475 }
1476
1477 /*
1478  * Steal lock ioctl - unconditional reserve device.
1479  * Buils a channel programm to break a device's reservation.
1480  * (unconditional reserve)
1481  */
1482 static int
1483 dasd_eckd_steal_lock(struct dasd_device *device)
1484 {
1485         struct dasd_ccw_req *cqr;
1486         int rc;
1487
1488         if (!capable(CAP_SYS_ADMIN))
1489                 return -EACCES;
1490
1491         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1492                                    1, 32, device);
1493         if (IS_ERR(cqr)) {
1494                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1495                             "Could not allocate initialization request");
1496                 return PTR_ERR(cqr);
1497         }
1498         cqr->cpaddr->cmd_code = DASD_ECKD_CCW_SLCK;
1499         cqr->cpaddr->flags |= CCW_FLAG_SLI;
1500         cqr->cpaddr->count = 32;
1501         cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1502         cqr->device = device;
1503         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1504         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1505         cqr->retries = 2;       /* set retry counter to enable basic ERP */
1506         cqr->expires = 2 * HZ;
1507         cqr->buildclk = get_clock();
1508         cqr->status = DASD_CQR_FILLED;
1509
1510         rc = dasd_sleep_on_immediatly(cqr);
1511
1512         dasd_sfree_request(cqr, cqr->device);
1513         return rc;
1514 }
1515
1516 /*
1517  * Read performance statistics
1518  */
1519 static int
1520 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
1521 {
1522         struct dasd_psf_prssd_data *prssdp;
1523         struct dasd_rssd_perf_stats_t *stats;
1524         struct dasd_ccw_req *cqr;
1525         struct ccw1 *ccw;
1526         int rc;
1527
1528         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1529                                    1 /* PSF */  + 1 /* RSSD */ ,
1530                                    (sizeof (struct dasd_psf_prssd_data) +
1531                                     sizeof (struct dasd_rssd_perf_stats_t)),
1532                                    device);
1533         if (IS_ERR(cqr)) {
1534                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1535                             "Could not allocate initialization request");
1536                 return PTR_ERR(cqr);
1537         }
1538         cqr->device = device;
1539         cqr->retries = 0;
1540         cqr->expires = 10 * HZ;
1541
1542         /* Prepare for Read Subsystem Data */
1543         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1544         memset(prssdp, 0, sizeof (struct dasd_psf_prssd_data));
1545         prssdp->order = PSF_ORDER_PRSSD;
1546         prssdp->suborder = 0x01;        /* Perfomance Statistics */
1547         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
1548
1549         ccw = cqr->cpaddr;
1550         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1551         ccw->count = sizeof (struct dasd_psf_prssd_data);
1552         ccw->flags |= CCW_FLAG_CC;
1553         ccw->cda = (__u32)(addr_t) prssdp;
1554
1555         /* Read Subsystem Data - Performance Statistics */
1556         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
1557         memset(stats, 0, sizeof (struct dasd_rssd_perf_stats_t));
1558
1559         ccw++;
1560         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1561         ccw->count = sizeof (struct dasd_rssd_perf_stats_t);
1562         ccw->cda = (__u32)(addr_t) stats;
1563
1564         cqr->buildclk = get_clock();
1565         cqr->status = DASD_CQR_FILLED;
1566         rc = dasd_sleep_on(cqr);
1567         if (rc == 0) {
1568                 /* Prepare for Read Subsystem Data */
1569                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1570                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
1571                 if (copy_to_user(argp, stats,
1572                                  sizeof(struct dasd_rssd_perf_stats_t)))
1573                         rc = -EFAULT;
1574         }
1575         dasd_sfree_request(cqr, cqr->device);
1576         return rc;
1577 }
1578
1579 /*
1580  * Get attributes (cache operations)
1581  * Returnes the cache attributes used in Define Extend (DE).
1582  */
1583 static int
1584 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
1585 {
1586         struct dasd_eckd_private *private =
1587                 (struct dasd_eckd_private *)device->private;
1588         struct attrib_data_t attrib = private->attrib;
1589         int rc;
1590
1591         if (!capable(CAP_SYS_ADMIN))
1592                 return -EACCES;
1593         if (!argp)
1594                 return -EINVAL;
1595
1596         rc = 0;
1597         if (copy_to_user(argp, (long *) &attrib,
1598                          sizeof (struct attrib_data_t)))
1599                 rc = -EFAULT;
1600
1601         return rc;
1602 }
1603
1604 /*
1605  * Set attributes (cache operations)
1606  * Stores the attributes for cache operation to be used in Define Extend (DE).
1607  */
1608 static int
1609 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
1610 {
1611         struct dasd_eckd_private *private =
1612                 (struct dasd_eckd_private *)device->private;
1613         struct attrib_data_t attrib;
1614
1615         if (!capable(CAP_SYS_ADMIN))
1616                 return -EACCES;
1617         if (!argp)
1618                 return -EINVAL;
1619
1620         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
1621                 return -EFAULT;
1622         private->attrib = attrib;
1623
1624         DEV_MESSAGE(KERN_INFO, device,
1625                     "cache operation mode set to %x (%i cylinder prestage)",
1626                     private->attrib.operation, private->attrib.nr_cyl);
1627         return 0;
1628 }
1629
1630 static int
1631 dasd_eckd_ioctl(struct dasd_device *device, unsigned int cmd, void __user *argp)
1632 {
1633         switch (cmd) {
1634         case BIODASDGATTR:
1635                 return dasd_eckd_get_attrib(device, argp);
1636         case BIODASDSATTR:
1637                 return dasd_eckd_set_attrib(device, argp);
1638         case BIODASDPSRD:
1639                 return dasd_eckd_performance(device, argp);
1640         case BIODASDRLSE:
1641                 return dasd_eckd_release(device);
1642         case BIODASDRSRV:
1643                 return dasd_eckd_reserve(device);
1644         case BIODASDSLCK:
1645                 return dasd_eckd_steal_lock(device);
1646         default:
1647                 return -ENOIOCTLCMD;
1648         }
1649 }
1650
1651 /*
1652  * Dump the range of CCWs into 'page' buffer
1653  * and return number of printed chars.
1654  */
1655 static int
1656 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
1657 {
1658         int len, count;
1659         char *datap;
1660
1661         len = 0;
1662         while (from <= to) {
1663                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1664                                " CCW %p: %08X %08X DAT:",
1665                                from, ((int *) from)[0], ((int *) from)[1]);
1666
1667                 /* get pointer to data (consider IDALs) */
1668                 if (from->flags & CCW_FLAG_IDA)
1669                         datap = (char *) *((addr_t *) (addr_t) from->cda);
1670                 else
1671                         datap = (char *) ((addr_t) from->cda);
1672
1673                 /* dump data (max 32 bytes) */
1674                 for (count = 0; count < from->count && count < 32; count++) {
1675                         if (count % 8 == 0) len += sprintf(page + len, " ");
1676                         if (count % 4 == 0) len += sprintf(page + len, " ");
1677                         len += sprintf(page + len, "%02x", datap[count]);
1678                 }
1679                 len += sprintf(page + len, "\n");
1680                 from++;
1681         }
1682         return len;
1683 }
1684
1685 /*
1686  * Print sense data and related channel program.
1687  * Parts are printed because printk buffer is only 1024 bytes.
1688  */
1689 static void
1690 dasd_eckd_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
1691                      struct irb *irb)
1692 {
1693         char *page;
1694         struct ccw1 *first, *last, *fail, *from, *to;
1695         int len, sl, sct;
1696
1697         page = (char *) get_zeroed_page(GFP_ATOMIC);
1698         if (page == NULL) {
1699                 DEV_MESSAGE(KERN_ERR, device, " %s",
1700                             "No memory to dump sense data");
1701                 return;
1702         }
1703         /* dump the sense data */
1704         len = sprintf(page,  KERN_ERR PRINTK_HEADER
1705                       " I/O status report for device %s:\n",
1706                       device->cdev->dev.bus_id);
1707         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1708                        " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
1709                        irb->scsw.cstat, irb->scsw.dstat);
1710         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1711                        " device %s: Failing CCW: %p\n",
1712                        device->cdev->dev.bus_id,
1713                        (void *) (addr_t) irb->scsw.cpa);
1714         if (irb->esw.esw0.erw.cons) {
1715                 for (sl = 0; sl < 4; sl++) {
1716                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1717                                        " Sense(hex) %2d-%2d:",
1718                                        (8 * sl), ((8 * sl) + 7));
1719
1720                         for (sct = 0; sct < 8; sct++) {
1721                                 len += sprintf(page + len, " %02x",
1722                                                irb->ecw[8 * sl + sct]);
1723                         }
1724                         len += sprintf(page + len, "\n");
1725                 }
1726
1727                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
1728                         /* 24 Byte Sense Data */
1729                         sprintf(page + len, KERN_ERR PRINTK_HEADER
1730                                 " 24 Byte: %x MSG %x, "
1731                                 "%s MSGb to SYSOP\n",
1732                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
1733                                 irb->ecw[1] & 0x10 ? "" : "no");
1734                 } else {
1735                         /* 32 Byte Sense Data */
1736                         sprintf(page + len, KERN_ERR PRINTK_HEADER
1737                                 " 32 Byte: Format: %x "
1738                                 "Exception class %x\n",
1739                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
1740                 }
1741         } else {
1742                 sprintf(page + len, KERN_ERR PRINTK_HEADER
1743                         " SORRY - NO VALID SENSE AVAILABLE\n");
1744         }
1745         printk("%s", page);
1746
1747         /* dump the Channel Program (max 140 Bytes per line) */
1748         /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
1749         first = req->cpaddr;
1750         for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
1751         to = min(first + 6, last);
1752         len = sprintf(page,  KERN_ERR PRINTK_HEADER
1753                       " Related CP in req: %p\n", req);
1754         dasd_eckd_dump_ccw_range(first, to, page + len);
1755         printk("%s", page);
1756
1757         /* print failing CCW area (maximum 4) */
1758         /* scsw->cda is either valid or zero  */
1759         len = 0;
1760         from = ++to;
1761         fail = (struct ccw1 *)(addr_t) irb->scsw.cpa; /* failing CCW */
1762         if (from <  fail - 2) {
1763                 from = fail - 2;     /* there is a gap - print header */
1764                 len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
1765         }
1766         to = min(fail + 1, last);
1767         len += dasd_eckd_dump_ccw_range(from, to, page + len);
1768
1769         /* print last CCWs (maximum 2) */
1770         from = max(from, ++to);
1771         if (from < last - 1) {
1772                 from = last - 1;     /* there is a gap - print header */
1773                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
1774         }
1775         len += dasd_eckd_dump_ccw_range(from, last, page + len);
1776         if (len > 0)
1777                 printk("%s", page);
1778         free_page((unsigned long) page);
1779 }
1780
1781 /*
1782  * max_blocks is dependent on the amount of storage that is available
1783  * in the static io buffer for each device. Currently each device has
1784  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
1785  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
1786  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
1787  * addition we have one define extent ccw + 16 bytes of data and one
1788  * locate record ccw + 16 bytes of data. That makes:
1789  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
1790  * We want to fit two into the available memory so that we can immediately
1791  * start the next request if one finishes off. That makes 249.5 blocks
1792  * for one request. Give a little safety and the result is 240.
1793  */
1794 static struct dasd_discipline dasd_eckd_discipline = {
1795         .owner = THIS_MODULE,
1796         .name = "ECKD",
1797         .ebcname = "ECKD",
1798         .max_blocks = 240,
1799         .check_device = dasd_eckd_check_characteristics,
1800         .do_analysis = dasd_eckd_do_analysis,
1801         .fill_geometry = dasd_eckd_fill_geometry,
1802         .start_IO = dasd_start_IO,
1803         .term_IO = dasd_term_IO,
1804         .format_device = dasd_eckd_format_device,
1805         .examine_error = dasd_eckd_examine_error,
1806         .erp_action = dasd_eckd_erp_action,
1807         .erp_postaction = dasd_eckd_erp_postaction,
1808         .build_cp = dasd_eckd_build_cp,
1809         .free_cp = dasd_eckd_free_cp,
1810         .dump_sense = dasd_eckd_dump_sense,
1811         .fill_info = dasd_eckd_fill_info,
1812         .ioctl = dasd_eckd_ioctl,
1813 };
1814
1815 static int __init
1816 dasd_eckd_init(void)
1817 {
1818         ASCEBC(dasd_eckd_discipline.ebcname, 4);
1819         return ccw_driver_register(&dasd_eckd_driver);
1820 }
1821
1822 static void __exit
1823 dasd_eckd_cleanup(void)
1824 {
1825         ccw_driver_unregister(&dasd_eckd_driver);
1826 }
1827
1828 module_init(dasd_eckd_init);
1829 module_exit(dasd_eckd_cleanup);