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  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
  10  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
  11  *
  12  */
  13
  14 #define KMSG_COMPONENT "dasd"
  15
  16 #include <linux/stddef.h>
  17 #include <linux/kernel.h>
  18 #include <linux/slab.h>
  19 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  20 #include <linux/bio.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23
  24 #include <asm/debug.h>
  25 #include <asm/idals.h>
  26 #include <asm/ebcdic.h>
  27 #include <asm/io.h>
  28 #include <asm/todclk.h>
  29 #include <asm/uaccess.h>
  30 #include <asm/cio.h>
  31 #include <asm/ccwdev.h>
  32 #include <asm/itcw.h>
  33
  34 #include "dasd_int.h"
  35 #include "dasd_eckd.h"
  36 #include "../cio/chsc.h"
  37
  38
  39 #ifdef PRINTK_HEADER
  40 #undef PRINTK_HEADER
  41 #endif                          /* PRINTK_HEADER */
  42 #define PRINTK_HEADER "dasd(eckd):"
  43
  44 #define ECKD_C0(i) (i->home_bytes)
  45 #define ECKD_F(i) (i->formula)
  46 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
  47                     (i->factors.f_0x02.f1))
  48 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
  49                     (i->factors.f_0x02.f2))
  50 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
  51                     (i->factors.f_0x02.f3))
  52 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
  53 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
  54 #define ECKD_F6(i) (i->factor6)
  55 #define ECKD_F7(i) (i->factor7)
  56 #define ECKD_F8(i) (i->factor8)
  57
  58 MODULE_LICENSE("GPL");
  59
  60 static struct dasd_discipline dasd_eckd_discipline;
  61
  62 /* The ccw bus type uses this table to find devices that it sends to
  63  * dasd_eckd_probe */
  64 static struct ccw_device_id dasd_eckd_ids[] = {
  65         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
  66         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
  67         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3390, 0), .driver_info = 0x3},
  68         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
  69         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
  70         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
  71         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
  72         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
  73         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
  74         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
  75         { /* end of list */ },
  76 };
  77
  78 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  79
  80 static struct ccw_driver dasd_eckd_driver; /* see below */
  81
  82 /* initial attempt at a probe function. this can be simplified once
  83  * the other detection code is gone */
  84 static int
  85 dasd_eckd_probe (struct ccw_device *cdev)
  86 {
  87         int ret;
  88
  89         /* set ECKD specific ccw-device options */
  90         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE);
  91         if (ret) {
  92                 DBF_EVENT(DBF_WARNING,
  93                        "dasd_eckd_probe: could not set ccw-device options "
  94                        "for %s\n", dev_name(&cdev->dev));
  95                 return ret;
  96         }
  97         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
  98         return ret;
  99 }
 100
 101 static int
 102 dasd_eckd_set_online(struct ccw_device *cdev)
 103 {
 104         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
 105 }
 106
 107 static struct ccw_driver dasd_eckd_driver = {
 108         .name        = "dasd-eckd",
 109         .owner       = THIS_MODULE,
 110         .ids         = dasd_eckd_ids,
 111         .probe       = dasd_eckd_probe,
 112         .remove      = dasd_generic_remove,
 113         .set_offline = dasd_generic_set_offline,
 114         .set_online  = dasd_eckd_set_online,
 115         .notify      = dasd_generic_notify,
 116 };
 117
 118 static const int sizes_trk0[] = { 28, 148, 84 };
 119 #define LABEL_SIZE 140
 120
 121 static inline unsigned int
 122 round_up_multiple(unsigned int no, unsigned int mult)
 123 {
 124         int rem = no % mult;
 125         return (rem ? no - rem + mult : no);
 126 }
 127
 128 static inline unsigned int
 129 ceil_quot(unsigned int d1, unsigned int d2)
 130 {
 131         return (d1 + (d2 - 1)) / d2;
 132 }
 133
 134 static unsigned int
 135 recs_per_track(struct dasd_eckd_characteristics * rdc,
 136                unsigned int kl, unsigned int dl)
 137 {
 138         int dn, kn;
 139
 140         switch (rdc->dev_type) {
 141         case 0x3380:
 142                 if (kl)
 143                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 144                                        ceil_quot(dl + 12, 32));
 145                 else
 146                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 147         case 0x3390:
 148                 dn = ceil_quot(dl + 6, 232) + 1;
 149                 if (kl) {
 150                         kn = ceil_quot(kl + 6, 232) + 1;
 151                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 152                                        9 + ceil_quot(dl + 6 * dn, 34));
 153                 } else
 154                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 155         case 0x9345:
 156                 dn = ceil_quot(dl + 6, 232) + 1;
 157                 if (kl) {
 158                         kn = ceil_quot(kl + 6, 232) + 1;
 159                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 160                                        ceil_quot(dl + 6 * dn, 34));
 161                 } else
 162                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 163         }
 164         return 0;
 165 }
 166
 167 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
 168 {
 169         geo->cyl = (__u16) cyl;
 170         geo->head = cyl >> 16;
 171         geo->head <<= 4;
 172         geo->head |= head;
 173 }
 174
 175 static int
 176 check_XRC (struct ccw1         *de_ccw,
 177            struct DE_eckd_data *data,
 178            struct dasd_device  *device)
 179 {
 180         struct dasd_eckd_private *private;
 181         int rc;
 182
 183         private = (struct dasd_eckd_private *) device->private;
 184         if (!private->rdc_data.facilities.XRC_supported)
 185                 return 0;
 186
 187         /* switch on System Time Stamp - needed for XRC Support */
 188         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 189         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 190
 191         rc = get_sync_clock(&data->ep_sys_time);
 192         /* Ignore return code if sync clock is switched off. */
 193         if (rc == -ENOSYS || rc == -EACCES)
 194                 rc = 0;
 195
 196         de_ccw->count = sizeof(struct DE_eckd_data);
 197         de_ccw->flags |= CCW_FLAG_SLI;
 198         return rc;
 199 }
 200
 201 static int
 202 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
 203               unsigned int totrk, int cmd, struct dasd_device *device)
 204 {
 205         struct dasd_eckd_private *private;
 206         u32 begcyl, endcyl;
 207         u16 heads, beghead, endhead;
 208         int rc = 0;
 209
 210         private = (struct dasd_eckd_private *) device->private;
 211
 212         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 213         ccw->flags = 0;
 214         ccw->count = 16;
 215         ccw->cda = (__u32) __pa(data);
 216
 217         memset(data, 0, sizeof(struct DE_eckd_data));
 218         switch (cmd) {
 219         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 220         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 221         case DASD_ECKD_CCW_READ:
 222         case DASD_ECKD_CCW_READ_MT:
 223         case DASD_ECKD_CCW_READ_CKD:
 224         case DASD_ECKD_CCW_READ_CKD_MT:
 225         case DASD_ECKD_CCW_READ_KD:
 226         case DASD_ECKD_CCW_READ_KD_MT:
 227         case DASD_ECKD_CCW_READ_COUNT:
 228                 data->mask.perm = 0x1;
 229                 data->attributes.operation = private->attrib.operation;
 230                 break;
 231         case DASD_ECKD_CCW_WRITE:
 232         case DASD_ECKD_CCW_WRITE_MT:
 233         case DASD_ECKD_CCW_WRITE_KD:
 234         case DASD_ECKD_CCW_WRITE_KD_MT:
 235                 data->mask.perm = 0x02;
 236                 data->attributes.operation = private->attrib.operation;
 237                 rc = check_XRC (ccw, data, device);
 238                 break;
 239         case DASD_ECKD_CCW_WRITE_CKD:
 240         case DASD_ECKD_CCW_WRITE_CKD_MT:
 241                 data->attributes.operation = DASD_BYPASS_CACHE;
 242                 rc = check_XRC (ccw, data, device);
 243                 break;
 244         case DASD_ECKD_CCW_ERASE:
 245         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 246         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 247                 data->mask.perm = 0x3;
 248                 data->mask.auth = 0x1;
 249                 data->attributes.operation = DASD_BYPASS_CACHE;
 250                 rc = check_XRC (ccw, data, device);
 251                 break;
 252         default:
 253                 dev_err(&device->cdev->dev,
 254                         "0x%x is not a known command\n", cmd);
 255                 break;
 256         }
 257
 258         data->attributes.mode = 0x3;    /* ECKD */
 259
 260         if ((private->rdc_data.cu_type == 0x2105 ||
 261              private->rdc_data.cu_type == 0x2107 ||
 262              private->rdc_data.cu_type == 0x1750)
 263             && !(private->uses_cdl && trk < 2))
 264                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 265
 266         heads = private->rdc_data.trk_per_cyl;
 267         begcyl = trk / heads;
 268         beghead = trk % heads;
 269         endcyl = totrk / heads;
 270         endhead = totrk % heads;
 271
 272         /* check for sequential prestage - enhance cylinder range */
 273         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 274             data->attributes.operation == DASD_SEQ_ACCESS) {
 275
 276                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
 277                         endcyl += private->attrib.nr_cyl;
 278                 else
 279                         endcyl = (private->real_cyl - 1);
 280         }
 281
 282         set_ch_t(&data->beg_ext, begcyl, beghead);
 283         set_ch_t(&data->end_ext, endcyl, endhead);
 284         return rc;
 285 }
 286
 287 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
 288                                struct dasd_device  *device)
 289 {
 290         struct dasd_eckd_private *private;
 291         int rc;
 292
 293         private = (struct dasd_eckd_private *) device->private;
 294         if (!private->rdc_data.facilities.XRC_supported)
 295                 return 0;
 296
 297         /* switch on System Time Stamp - needed for XRC Support */
 298         pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid'   */
 299         pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
 300         pfxdata->validity.time_stamp = 1;           /* 'Time Stamp Valid'   */
 301
 302         rc = get_sync_clock(&pfxdata->define_extent.ep_sys_time);
 303         /* Ignore return code if sync clock is switched off. */
 304         if (rc == -ENOSYS || rc == -EACCES)
 305                 rc = 0;
 306         return rc;
 307 }
 308
 309 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
 310                           unsigned int rec_on_trk, int count, int cmd,
 311                           struct dasd_device *device, unsigned int reclen,
 312                           unsigned int tlf)
 313 {
 314         struct dasd_eckd_private *private;
 315         int sector;
 316         int dn, d;
 317
 318         private = (struct dasd_eckd_private *) device->private;
 319
 320         memset(data, 0, sizeof(*data));
 321         sector = 0;
 322         if (rec_on_trk) {
 323                 switch (private->rdc_data.dev_type) {
 324                 case 0x3390:
 325                         dn = ceil_quot(reclen + 6, 232);
 326                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 327                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 328                         break;
 329                 case 0x3380:
 330                         d = 7 + ceil_quot(reclen + 12, 32);
 331                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 332                         break;
 333                 }
 334         }
 335         data->sector = sector;
 336         /* note: meaning of count depends on the operation
 337          *       for record based I/O it's the number of records, but for
 338          *       track based I/O it's the number of tracks
 339          */
 340         data->count = count;
 341         switch (cmd) {
 342         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 343                 data->operation.orientation = 0x3;
 344                 data->operation.operation = 0x03;
 345                 break;
 346         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 347                 data->operation.orientation = 0x3;
 348                 data->operation.operation = 0x16;
 349                 break;
 350         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 351                 data->operation.orientation = 0x1;
 352                 data->operation.operation = 0x03;
 353                 data->count++;
 354                 break;
 355         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 356                 data->operation.orientation = 0x3;
 357                 data->operation.operation = 0x16;
 358                 data->count++;
 359                 break;
 360         case DASD_ECKD_CCW_WRITE:
 361         case DASD_ECKD_CCW_WRITE_MT:
 362         case DASD_ECKD_CCW_WRITE_KD:
 363         case DASD_ECKD_CCW_WRITE_KD_MT:
 364                 data->auxiliary.length_valid = 0x1;
 365                 data->length = reclen;
 366                 data->operation.operation = 0x01;
 367                 break;
 368         case DASD_ECKD_CCW_WRITE_CKD:
 369         case DASD_ECKD_CCW_WRITE_CKD_MT:
 370                 data->auxiliary.length_valid = 0x1;
 371                 data->length = reclen;
 372                 data->operation.operation = 0x03;
 373                 break;
 374         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 375                 data->auxiliary.length_valid = 0x1;
 376                 data->length = reclen;  /* not tlf, as one might think */
 377                 data->operation.operation = 0x3F;
 378                 data->extended_operation = 0x23;
 379                 break;
 380         case DASD_ECKD_CCW_READ:
 381         case DASD_ECKD_CCW_READ_MT:
 382         case DASD_ECKD_CCW_READ_KD:
 383         case DASD_ECKD_CCW_READ_KD_MT:
 384                 data->auxiliary.length_valid = 0x1;
 385                 data->length = reclen;
 386                 data->operation.operation = 0x06;
 387                 break;
 388         case DASD_ECKD_CCW_READ_CKD:
 389         case DASD_ECKD_CCW_READ_CKD_MT:
 390                 data->auxiliary.length_valid = 0x1;
 391                 data->length = reclen;
 392                 data->operation.operation = 0x16;
 393                 break;
 394         case DASD_ECKD_CCW_READ_COUNT:
 395                 data->operation.operation = 0x06;
 396                 break;
 397         case DASD_ECKD_CCW_READ_TRACK_DATA:
 398                 data->auxiliary.length_valid = 0x1;
 399                 data->length = tlf;
 400                 data->operation.operation = 0x0C;
 401                 break;
 402         case DASD_ECKD_CCW_ERASE:
 403                 data->length = reclen;
 404                 data->auxiliary.length_valid = 0x1;
 405                 data->operation.operation = 0x0b;
 406                 break;
 407         default:
 408                 DBF_DEV_EVENT(DBF_ERR, device,
 409                             "fill LRE unknown opcode 0x%x", cmd);
 410                 BUG();
 411         }
 412         set_ch_t(&data->seek_addr,
 413                  trk / private->rdc_data.trk_per_cyl,
 414                  trk % private->rdc_data.trk_per_cyl);
 415         data->search_arg.cyl = data->seek_addr.cyl;
 416         data->search_arg.head = data->seek_addr.head;
 417         data->search_arg.record = rec_on_trk;
 418 }
 419
 420 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 421                       unsigned int trk, unsigned int totrk, int cmd,
 422                       struct dasd_device *basedev, struct dasd_device *startdev,
 423                       unsigned char format, unsigned int rec_on_trk, int count,
 424                       unsigned int blksize, unsigned int tlf)
 425 {
 426         struct dasd_eckd_private *basepriv, *startpriv;
 427         struct DE_eckd_data *dedata;
 428         struct LRE_eckd_data *lredata;
 429         u32 begcyl, endcyl;
 430         u16 heads, beghead, endhead;
 431         int rc = 0;
 432
 433         basepriv = (struct dasd_eckd_private *) basedev->private;
 434         startpriv = (struct dasd_eckd_private *) startdev->private;
 435         dedata = &pfxdata->define_extent;
 436         lredata = &pfxdata->locate_record;
 437
 438         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 439         ccw->flags = 0;
 440         ccw->count = sizeof(*pfxdata);
 441         ccw->cda = (__u32) __pa(pfxdata);
 442
 443         memset(pfxdata, 0, sizeof(*pfxdata));
 444         /* prefix data */
 445         if (format > 1) {
 446                 DBF_DEV_EVENT(DBF_ERR, basedev,
 447                               "PFX LRE unknown format 0x%x", format);
 448                 BUG();
 449                 return -EINVAL;
 450         }
 451         pfxdata->format = format;
 452         pfxdata->base_address = basepriv->ned->unit_addr;
 453         pfxdata->base_lss = basepriv->ned->ID;
 454         pfxdata->validity.define_extent = 1;
 455
 456         /* private uid is kept up to date, conf_data may be outdated */
 457         if (startpriv->uid.type != UA_BASE_DEVICE) {
 458                 pfxdata->validity.verify_base = 1;
 459                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
 460                         pfxdata->validity.hyper_pav = 1;
 461         }
 462
 463         /* define extend data (mostly)*/
 464         switch (cmd) {
 465         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 466         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 467         case DASD_ECKD_CCW_READ:
 468         case DASD_ECKD_CCW_READ_MT:
 469         case DASD_ECKD_CCW_READ_CKD:
 470         case DASD_ECKD_CCW_READ_CKD_MT:
 471         case DASD_ECKD_CCW_READ_KD:
 472         case DASD_ECKD_CCW_READ_KD_MT:
 473         case DASD_ECKD_CCW_READ_COUNT:
 474                 dedata->mask.perm = 0x1;
 475                 dedata->attributes.operation = basepriv->attrib.operation;
 476                 break;
 477         case DASD_ECKD_CCW_READ_TRACK_DATA:
 478                 dedata->mask.perm = 0x1;
 479                 dedata->attributes.operation = basepriv->attrib.operation;
 480                 dedata->blk_size = 0;
 481                 break;
 482         case DASD_ECKD_CCW_WRITE:
 483         case DASD_ECKD_CCW_WRITE_MT:
 484         case DASD_ECKD_CCW_WRITE_KD:
 485         case DASD_ECKD_CCW_WRITE_KD_MT:
 486                 dedata->mask.perm = 0x02;
 487                 dedata->attributes.operation = basepriv->attrib.operation;
 488                 rc = check_XRC_on_prefix(pfxdata, basedev);
 489                 break;
 490         case DASD_ECKD_CCW_WRITE_CKD:
 491         case DASD_ECKD_CCW_WRITE_CKD_MT:
 492                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 493                 rc = check_XRC_on_prefix(pfxdata, basedev);
 494                 break;
 495         case DASD_ECKD_CCW_ERASE:
 496         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 497         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 498                 dedata->mask.perm = 0x3;
 499                 dedata->mask.auth = 0x1;
 500                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 501                 rc = check_XRC_on_prefix(pfxdata, basedev);
 502                 break;
 503         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 504                 dedata->mask.perm = 0x02;
 505                 dedata->attributes.operation = basepriv->attrib.operation;
 506                 dedata->blk_size = blksize;
 507                 rc = check_XRC_on_prefix(pfxdata, basedev);
 508                 break;
 509         default:
 510                 DBF_DEV_EVENT(DBF_ERR, basedev,
 511                             "PFX LRE unknown opcode 0x%x", cmd);
 512                 BUG();
 513                 return -EINVAL;
 514         }
 515
 516         dedata->attributes.mode = 0x3;  /* ECKD */
 517
 518         if ((basepriv->rdc_data.cu_type == 0x2105 ||
 519              basepriv->rdc_data.cu_type == 0x2107 ||
 520              basepriv->rdc_data.cu_type == 0x1750)
 521             && !(basepriv->uses_cdl && trk < 2))
 522                 dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
 523
 524         heads = basepriv->rdc_data.trk_per_cyl;
 525         begcyl = trk / heads;
 526         beghead = trk % heads;
 527         endcyl = totrk / heads;
 528         endhead = totrk % heads;
 529
 530         /* check for sequential prestage - enhance cylinder range */
 531         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
 532             dedata->attributes.operation == DASD_SEQ_ACCESS) {
 533
 534                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
 535                         endcyl += basepriv->attrib.nr_cyl;
 536                 else
 537                         endcyl = (basepriv->real_cyl - 1);
 538         }
 539
 540         set_ch_t(&dedata->beg_ext, begcyl, beghead);
 541         set_ch_t(&dedata->end_ext, endcyl, endhead);
 542
 543         if (format == 1) {
 544                 fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
 545                               basedev, blksize, tlf);
 546         }
 547
 548         return rc;
 549 }
 550
 551 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 552                   unsigned int trk, unsigned int totrk, int cmd,
 553                   struct dasd_device *basedev, struct dasd_device *startdev)
 554 {
 555         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
 556                           0, 0, 0, 0, 0);
 557 }
 558
 559 static void
 560 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
 561               unsigned int rec_on_trk, int no_rec, int cmd,
 562               struct dasd_device * device, int reclen)
 563 {
 564         struct dasd_eckd_private *private;
 565         int sector;
 566         int dn, d;
 567
 568         private = (struct dasd_eckd_private *) device->private;
 569
 570         DBF_DEV_EVENT(DBF_INFO, device,
 571                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 572                   trk, rec_on_trk, no_rec, cmd, reclen);
 573
 574         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 575         ccw->flags = 0;
 576         ccw->count = 16;
 577         ccw->cda = (__u32) __pa(data);
 578
 579         memset(data, 0, sizeof(struct LO_eckd_data));
 580         sector = 0;
 581         if (rec_on_trk) {
 582                 switch (private->rdc_data.dev_type) {
 583                 case 0x3390:
 584                         dn = ceil_quot(reclen + 6, 232);
 585                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 586                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 587                         break;
 588                 case 0x3380:
 589                         d = 7 + ceil_quot(reclen + 12, 32);
 590                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 591                         break;
 592                 }
 593         }
 594         data->sector = sector;
 595         data->count = no_rec;
 596         switch (cmd) {
 597         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 598                 data->operation.orientation = 0x3;
 599                 data->operation.operation = 0x03;
 600                 break;
 601         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 602                 data->operation.orientation = 0x3;
 603                 data->operation.operation = 0x16;
 604                 break;
 605         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 606                 data->operation.orientation = 0x1;
 607                 data->operation.operation = 0x03;
 608                 data->count++;
 609                 break;
 610         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 611                 data->operation.orientation = 0x3;
 612                 data->operation.operation = 0x16;
 613                 data->count++;
 614                 break;
 615         case DASD_ECKD_CCW_WRITE:
 616         case DASD_ECKD_CCW_WRITE_MT:
 617         case DASD_ECKD_CCW_WRITE_KD:
 618         case DASD_ECKD_CCW_WRITE_KD_MT:
 619                 data->auxiliary.last_bytes_used = 0x1;
 620                 data->length = reclen;
 621                 data->operation.operation = 0x01;
 622                 break;
 623         case DASD_ECKD_CCW_WRITE_CKD:
 624         case DASD_ECKD_CCW_WRITE_CKD_MT:
 625                 data->auxiliary.last_bytes_used = 0x1;
 626                 data->length = reclen;
 627                 data->operation.operation = 0x03;
 628                 break;
 629         case DASD_ECKD_CCW_READ:
 630         case DASD_ECKD_CCW_READ_MT:
 631         case DASD_ECKD_CCW_READ_KD:
 632         case DASD_ECKD_CCW_READ_KD_MT:
 633                 data->auxiliary.last_bytes_used = 0x1;
 634                 data->length = reclen;
 635                 data->operation.operation = 0x06;
 636                 break;
 637         case DASD_ECKD_CCW_READ_CKD:
 638         case DASD_ECKD_CCW_READ_CKD_MT:
 639                 data->auxiliary.last_bytes_used = 0x1;
 640                 data->length = reclen;
 641                 data->operation.operation = 0x16;
 642                 break;
 643         case DASD_ECKD_CCW_READ_COUNT:
 644                 data->operation.operation = 0x06;
 645                 break;
 646         case DASD_ECKD_CCW_ERASE:
 647                 data->length = reclen;
 648                 data->auxiliary.last_bytes_used = 0x1;
 649                 data->operation.operation = 0x0b;
 650                 break;
 651         default:
 652                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
 653                               "opcode 0x%x", cmd);
 654         }
 655         set_ch_t(&data->seek_addr,
 656                  trk / private->rdc_data.trk_per_cyl,
 657                  trk % private->rdc_data.trk_per_cyl);
 658         data->search_arg.cyl = data->seek_addr.cyl;
 659         data->search_arg.head = data->seek_addr.head;
 660         data->search_arg.record = rec_on_trk;
 661 }
 662
 663 /*
 664  * Returns 1 if the block is one of the special blocks that needs
 665  * to get read/written with the KD variant of the command.
 666  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 667  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 668  * Luckily the KD variants differ only by one bit (0x08) from the
 669  * normal variant. So don't wonder about code like:
 670  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 671  *         ccw->cmd_code |= 0x8;
 672  */
 673 static inline int
 674 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 675 {
 676         if (recid < 3)
 677                 return 1;
 678         if (recid < blk_per_trk)
 679                 return 0;
 680         if (recid < 2 * blk_per_trk)
 681                 return 1;
 682         return 0;
 683 }
 684
 685 /*
 686  * Returns the record size for the special blocks of the cdl format.
 687  * Only returns something useful if dasd_eckd_cdl_special is true
 688  * for the recid.
 689  */
 690 static inline int
 691 dasd_eckd_cdl_reclen(int recid)
 692 {
 693         if (recid < 3)
 694                 return sizes_trk0[recid];
 695         return LABEL_SIZE;
 696 }
 697
 698 /*
 699  * Generate device unique id that specifies the physical device.
 700  */
 701 static int dasd_eckd_generate_uid(struct dasd_device *device,
 702                                   struct dasd_uid *uid)
 703 {
 704         struct dasd_eckd_private *private;
 705         int count;
 706
 707         private = (struct dasd_eckd_private *) device->private;
 708         if (!private)
 709                 return -ENODEV;
 710         if (!private->ned || !private->gneq)
 711                 return -ENODEV;
 712
 713         memset(uid, 0, sizeof(struct dasd_uid));
 714         memcpy(uid->vendor, private->ned->HDA_manufacturer,
 715                sizeof(uid->vendor) - 1);
 716         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 717         memcpy(uid->serial, private->ned->HDA_location,
 718                sizeof(uid->serial) - 1);
 719         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 720         uid->ssid = private->gneq->subsystemID;
 721         uid->real_unit_addr = private->ned->unit_addr;;
 722         if (private->sneq) {
 723                 uid->type = private->sneq->sua_flags;
 724                 if (uid->type == UA_BASE_PAV_ALIAS)
 725                         uid->base_unit_addr = private->sneq->base_unit_addr;
 726         } else {
 727                 uid->type = UA_BASE_DEVICE;
 728         }
 729         if (private->vdsneq) {
 730                 for (count = 0; count < 16; count++) {
 731                         sprintf(uid->vduit+2*count, "%02x",
 732                                 private->vdsneq->uit[count]);
 733                 }
 734         }
 735         return 0;
 736 }
 737
 738 static struct dasd_ccw_req *dasd_eckd_build_rcd_lpm(struct dasd_device *device,
 739                                                     void *rcd_buffer,
 740                                                     struct ciw *ciw, __u8 lpm)
 741 {
 742         struct dasd_ccw_req *cqr;
 743         struct ccw1 *ccw;
 744
 745         cqr = dasd_smalloc_request("ECKD", 1 /* RCD */, ciw->count, device);
 746
 747         if (IS_ERR(cqr)) {
 748                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 749                               "Could not allocate RCD request");
 750                 return cqr;
 751         }
 752
 753         ccw = cqr->cpaddr;
 754         ccw->cmd_code = ciw->cmd;
 755         ccw->cda = (__u32)(addr_t)rcd_buffer;
 756         ccw->count = ciw->count;
 757
 758         cqr->startdev = device;
 759         cqr->memdev = device;
 760         cqr->block = NULL;
 761         cqr->expires = 10*HZ;
 762         cqr->lpm = lpm;
 763         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 764         cqr->retries = 2;
 765         cqr->buildclk = get_clock();
 766         cqr->status = DASD_CQR_FILLED;
 767         return cqr;
 768 }
 769
 770 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 771                                    void **rcd_buffer,
 772                                    int *rcd_buffer_size, __u8 lpm)
 773 {
 774         struct ciw *ciw;
 775         char *rcd_buf = NULL;
 776         int ret;
 777         struct dasd_ccw_req *cqr;
 778
 779         /*
 780          * scan for RCD command in extended SenseID data
 781          */
 782         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 783         if (!ciw || ciw->cmd == 0) {
 784                 ret = -EOPNOTSUPP;
 785                 goto out_error;
 786         }
 787         rcd_buf = kzalloc(ciw->count, GFP_KERNEL | GFP_DMA);
 788         if (!rcd_buf) {
 789                 ret = -ENOMEM;
 790                 goto out_error;
 791         }
 792
 793         /*
 794          * buffer has to start with EBCDIC "V1.0" to show
 795          * support for virtual device SNEQ
 796          */
 797         rcd_buf[0] = 0xE5;
 798         rcd_buf[1] = 0xF1;
 799         rcd_buf[2] = 0x4B;
 800         rcd_buf[3] = 0xF0;
 801         cqr = dasd_eckd_build_rcd_lpm(device, rcd_buf, ciw, lpm);
 802         if (IS_ERR(cqr)) {
 803                 ret =  PTR_ERR(cqr);
 804                 goto out_error;
 805         }
 806         ret = dasd_sleep_on(cqr);
 807         /*
 808          * on success we update the user input parms
 809          */
 810         dasd_sfree_request(cqr, cqr->memdev);
 811         if (ret)
 812                 goto out_error;
 813
 814         *rcd_buffer_size = ciw->count;
 815         *rcd_buffer = rcd_buf;
 816         return 0;
 817 out_error:
 818         kfree(rcd_buf);
 819         *rcd_buffer = NULL;
 820         *rcd_buffer_size = 0;
 821         return ret;
 822 }
 823
 824 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
 825 {
 826
 827         struct dasd_sneq *sneq;
 828         int i, count;
 829
 830         private->ned = NULL;
 831         private->sneq = NULL;
 832         private->vdsneq = NULL;
 833         private->gneq = NULL;
 834         count = private->conf_len / sizeof(struct dasd_sneq);
 835         sneq = (struct dasd_sneq *)private->conf_data;
 836         for (i = 0; i < count; ++i) {
 837                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 838                         private->sneq = sneq;
 839                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 840                         private->vdsneq = (struct vd_sneq *)sneq;
 841                 else if (sneq->flags.identifier == 2)
 842                         private->gneq = (struct dasd_gneq *)sneq;
 843                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 844                         private->ned = (struct dasd_ned *)sneq;
 845                 sneq++;
 846         }
 847         if (!private->ned || !private->gneq) {
 848                 private->ned = NULL;
 849                 private->sneq = NULL;
 850                 private->vdsneq = NULL;
 851                 private->gneq = NULL;
 852                 return -EINVAL;
 853         }
 854         return 0;
 855
 856 };
 857
 858 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
 859 {
 860         struct dasd_gneq *gneq;
 861         int i, count, found;
 862
 863         count = conf_len / sizeof(*gneq);
 864         gneq = (struct dasd_gneq *)conf_data;
 865         found = 0;
 866         for (i = 0; i < count; ++i) {
 867                 if (gneq->flags.identifier == 2) {
 868                         found = 1;
 869                         break;
 870                 }
 871                 gneq++;
 872         }
 873         if (found)
 874                 return ((char *)gneq)[18] & 0x07;
 875         else
 876                 return 0;
 877 }
 878
 879 static int dasd_eckd_read_conf(struct dasd_device *device)
 880 {
 881         void *conf_data;
 882         int conf_len, conf_data_saved;
 883         int rc;
 884         __u8 lpm;
 885         struct dasd_eckd_private *private;
 886         struct dasd_eckd_path *path_data;
 887
 888         private = (struct dasd_eckd_private *) device->private;
 889         path_data = (struct dasd_eckd_path *) &private->path_data;
 890         path_data->opm = ccw_device_get_path_mask(device->cdev);
 891         lpm = 0x80;
 892         conf_data_saved = 0;
 893         /* get configuration data per operational path */
 894         for (lpm = 0x80; lpm; lpm>>= 1) {
 895                 if (lpm & path_data->opm){
 896                         rc = dasd_eckd_read_conf_lpm(device, &conf_data,
 897                                                      &conf_len, lpm);
 898                         if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
 899                                 DBF_EVENT(DBF_WARNING,
 900                                           "Read configuration data returned "
 901                                           "error %d for device: %s", rc,
 902                                           dev_name(&device->cdev->dev));
 903                                 return rc;
 904                         }
 905                         if (conf_data == NULL) {
 906                                 DBF_EVENT(DBF_WARNING, "No configuration "
 907                                           "data retrieved for device: %s",
 908                                           dev_name(&device->cdev->dev));
 909                                 continue;       /* no error */
 910                         }
 911                         /* save first valid configuration data */
 912                         if (!conf_data_saved) {
 913                                 kfree(private->conf_data);
 914                                 private->conf_data = conf_data;
 915                                 private->conf_len = conf_len;
 916                                 if (dasd_eckd_identify_conf_parts(private)) {
 917                                         private->conf_data = NULL;
 918                                         private->conf_len = 0;
 919                                         kfree(conf_data);
 920                                         continue;
 921                                 }
 922                                 conf_data_saved++;
 923                         }
 924                         switch (dasd_eckd_path_access(conf_data, conf_len)) {
 925                         case 0x02:
 926                                 path_data->npm |= lpm;
 927                                 break;
 928                         case 0x03:
 929                                 path_data->ppm |= lpm;
 930                                 break;
 931                         }
 932                         if (conf_data != private->conf_data)
 933                                 kfree(conf_data);
 934                 }
 935         }
 936         return 0;
 937 }
 938
 939 static int dasd_eckd_read_features(struct dasd_device *device)
 940 {
 941         struct dasd_psf_prssd_data *prssdp;
 942         struct dasd_rssd_features *features;
 943         struct dasd_ccw_req *cqr;
 944         struct ccw1 *ccw;
 945         int rc;
 946         struct dasd_eckd_private *private;
 947
 948         private = (struct dasd_eckd_private *) device->private;
 949         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
 950                                    1 /* PSF */  + 1 /* RSSD */ ,
 951                                    (sizeof(struct dasd_psf_prssd_data) +
 952                                     sizeof(struct dasd_rssd_features)),
 953                                    device);
 954         if (IS_ERR(cqr)) {
 955                 DBF_EVENT(DBF_WARNING, "Could not allocate initialization "
 956                           "request for device: %s",
 957                           dev_name(&device->cdev->dev));
 958                 return PTR_ERR(cqr);
 959         }
 960         cqr->startdev = device;
 961         cqr->memdev = device;
 962         cqr->block = NULL;
 963         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 964         cqr->retries = 5;
 965         cqr->expires = 10 * HZ;
 966
 967         /* Prepare for Read Subsystem Data */
 968         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
 969         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
 970         prssdp->order = PSF_ORDER_PRSSD;
 971         prssdp->suborder = 0x41;        /* Read Feature Codes */
 972         /* all other bytes of prssdp must be zero */
 973
 974         ccw = cqr->cpaddr;
 975         ccw->cmd_code = DASD_ECKD_CCW_PSF;
 976         ccw->count = sizeof(struct dasd_psf_prssd_data);
 977         ccw->flags |= CCW_FLAG_CC;
 978         ccw->cda = (__u32)(addr_t) prssdp;
 979
 980         /* Read Subsystem Data - feature codes */
 981         features = (struct dasd_rssd_features *) (prssdp + 1);
 982         memset(features, 0, sizeof(struct dasd_rssd_features));
 983
 984         ccw++;
 985         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
 986         ccw->count = sizeof(struct dasd_rssd_features);
 987         ccw->cda = (__u32)(addr_t) features;
 988
 989         cqr->buildclk = get_clock();
 990         cqr->status = DASD_CQR_FILLED;
 991         rc = dasd_sleep_on(cqr);
 992         if (rc == 0) {
 993                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
 994                 features = (struct dasd_rssd_features *) (prssdp + 1);
 995                 memcpy(&private->features, features,
 996                        sizeof(struct dasd_rssd_features));
 997         }
 998         dasd_sfree_request(cqr, cqr->memdev);
 999         return rc;
1000 }
1001
1002
1003 /*
1004  * Build CP for Perform Subsystem Function - SSC.
1005  */
1006 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1007                                                     int enable_pav)
1008 {
1009         struct dasd_ccw_req *cqr;
1010         struct dasd_psf_ssc_data *psf_ssc_data;
1011         struct ccw1 *ccw;
1012
1013         cqr = dasd_smalloc_request("ECKD", 1 /* PSF */ ,
1014                                   sizeof(struct dasd_psf_ssc_data),
1015                                   device);
1016
1017         if (IS_ERR(cqr)) {
1018                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1019                            "Could not allocate PSF-SSC request");
1020                 return cqr;
1021         }
1022         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1023         psf_ssc_data->order = PSF_ORDER_SSC;
1024         psf_ssc_data->suborder = 0x40;
1025         if (enable_pav) {
1026                 psf_ssc_data->suborder |= 0x88;
1027                 psf_ssc_data->reserved[0] = 0x88;
1028         }
1029         ccw = cqr->cpaddr;
1030         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1031         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1032         ccw->count = 66;
1033
1034         cqr->startdev = device;
1035         cqr->memdev = device;
1036         cqr->block = NULL;
1037         cqr->expires = 10*HZ;
1038         cqr->buildclk = get_clock();
1039         cqr->status = DASD_CQR_FILLED;
1040         return cqr;
1041 }
1042
1043 /*
1044  * Perform Subsystem Function.
1045  * It is necessary to trigger CIO for channel revalidation since this
1046  * call might change behaviour of DASD devices.
1047  */
1048 static int
1049 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav)
1050 {
1051         struct dasd_ccw_req *cqr;
1052         int rc;
1053
1054         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1055         if (IS_ERR(cqr))
1056                 return PTR_ERR(cqr);
1057
1058         rc = dasd_sleep_on(cqr);
1059         if (!rc)
1060                 /* trigger CIO to reprobe devices */
1061                 css_schedule_reprobe();
1062         dasd_sfree_request(cqr, cqr->memdev);
1063         return rc;
1064 }
1065
1066 /*
1067  * Valide storage server of current device.
1068  */
1069 static int dasd_eckd_validate_server(struct dasd_device *device)
1070 {
1071         int rc;
1072         struct dasd_eckd_private *private;
1073         int enable_pav;
1074
1075         if (dasd_nopav || MACHINE_IS_VM)
1076                 enable_pav = 0;
1077         else
1078                 enable_pav = 1;
1079         rc = dasd_eckd_psf_ssc(device, enable_pav);
1080         /* may be requested feature is not available on server,
1081          * therefore just report error and go ahead */
1082         private = (struct dasd_eckd_private *) device->private;
1083         DBF_EVENT(DBF_WARNING, "PSF-SSC on storage subsystem %s.%s.%04x "
1084                   "returned rc=%d for device: %s",
1085                   private->uid.vendor, private->uid.serial,
1086                   private->uid.ssid, rc, dev_name(&device->cdev->dev));
1087         /* RE-Read Configuration Data */
1088         return dasd_eckd_read_conf(device);
1089 }
1090
1091 /*
1092  * Check device characteristics.
1093  * If the device is accessible using ECKD discipline, the device is enabled.
1094  */
1095 static int
1096 dasd_eckd_check_characteristics(struct dasd_device *device)
1097 {
1098         struct dasd_eckd_private *private;
1099         struct dasd_block *block;
1100         void *rdc_data;
1101         int is_known, rc;
1102
1103         private = (struct dasd_eckd_private *) device->private;
1104         if (private == NULL) {
1105                 private = kzalloc(sizeof(struct dasd_eckd_private),
1106                                   GFP_KERNEL | GFP_DMA);
1107                 if (private == NULL) {
1108                         dev_warn(&device->cdev->dev,
1109                                  "Allocating memory for private DASD data "
1110                                  "failed\n");
1111                         return -ENOMEM;
1112                 }
1113                 device->private = (void *) private;
1114         }
1115         /* Invalidate status of initial analysis. */
1116         private->init_cqr_status = -1;
1117         /* Set default cache operations. */
1118         private->attrib.operation = DASD_NORMAL_CACHE;
1119         private->attrib.nr_cyl = 0;
1120
1121         /* Read Configuration Data */
1122         rc = dasd_eckd_read_conf(device);
1123         if (rc)
1124                 goto out_err1;
1125
1126         /* Generate device unique id and register in devmap */
1127         rc = dasd_eckd_generate_uid(device, &private->uid);
1128         if (rc)
1129                 goto out_err1;
1130         dasd_set_uid(device->cdev, &private->uid);
1131
1132         if (private->uid.type == UA_BASE_DEVICE) {
1133                 block = dasd_alloc_block();
1134                 if (IS_ERR(block)) {
1135                         DBF_EVENT(DBF_WARNING, "could not allocate dasd "
1136                                   "block structure for device: %s",
1137                                   dev_name(&device->cdev->dev));
1138                         rc = PTR_ERR(block);
1139                         goto out_err1;
1140                 }
1141                 device->block = block;
1142                 block->base = device;
1143         }
1144
1145         /* register lcu with alias handling, enable PAV if this is a new lcu */
1146         is_known = dasd_alias_make_device_known_to_lcu(device);
1147         if (is_known < 0) {
1148                 rc = is_known;
1149                 goto out_err2;
1150         }
1151         if (!is_known) {
1152                 /* new lcu found */
1153                 rc = dasd_eckd_validate_server(device); /* will switch pav on */
1154                 if (rc)
1155                         goto out_err3;
1156         }
1157
1158         /* Read Feature Codes */
1159         rc = dasd_eckd_read_features(device);
1160         if (rc)
1161                 goto out_err3;
1162
1163         /* Read Device Characteristics */
1164         rdc_data = (void *) &(private->rdc_data);
1165         memset(rdc_data, 0, sizeof(rdc_data));
1166         rc = dasd_generic_read_dev_chars(device, "ECKD", &rdc_data, 64);
1167         if (rc) {
1168                 DBF_EVENT(DBF_WARNING,
1169                           "Read device characteristics failed, rc=%d for "
1170                           "device: %s", rc, dev_name(&device->cdev->dev));
1171                 goto out_err3;
1172         }
1173         /* find the vaild cylinder size */
1174         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1175             private->rdc_data.long_no_cyl)
1176                 private->real_cyl = private->rdc_data.long_no_cyl;
1177         else
1178                 private->real_cyl = private->rdc_data.no_cyl;
1179
1180         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1181                  "with %d cylinders, %d heads, %d sectors\n",
1182                  private->rdc_data.dev_type,
1183                  private->rdc_data.dev_model,
1184                  private->rdc_data.cu_type,
1185                  private->rdc_data.cu_model.model,
1186                     private->real_cyl,
1187                  private->rdc_data.trk_per_cyl,
1188                  private->rdc_data.sec_per_trk);
1189         return 0;
1190
1191 out_err3:
1192         dasd_alias_disconnect_device_from_lcu(device);
1193 out_err2:
1194         dasd_free_block(device->block);
1195         device->block = NULL;
1196 out_err1:
1197         kfree(private->conf_data);
1198         kfree(device->private);
1199         device->private = NULL;
1200         return rc;
1201 }
1202
1203 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1204 {
1205         struct dasd_eckd_private *private;
1206
1207         private = (struct dasd_eckd_private *) device->private;
1208         dasd_alias_disconnect_device_from_lcu(device);
1209         private->ned = NULL;
1210         private->sneq = NULL;
1211         private->vdsneq = NULL;
1212         private->gneq = NULL;
1213         private->conf_len = 0;
1214         kfree(private->conf_data);
1215         private->conf_data = NULL;
1216 }
1217
1218 static struct dasd_ccw_req *
1219 dasd_eckd_analysis_ccw(struct dasd_device *device)
1220 {
1221         struct dasd_eckd_private *private;
1222         struct eckd_count *count_data;
1223         struct LO_eckd_data *LO_data;
1224         struct dasd_ccw_req *cqr;
1225         struct ccw1 *ccw;
1226         int cplength, datasize;
1227         int i;
1228
1229         private = (struct dasd_eckd_private *) device->private;
1230
1231         cplength = 8;
1232         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1233         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1234                                    cplength, datasize, device);
1235         if (IS_ERR(cqr))
1236                 return cqr;
1237         ccw = cqr->cpaddr;
1238         /* Define extent for the first 3 tracks. */
1239         define_extent(ccw++, cqr->data, 0, 2,
1240                       DASD_ECKD_CCW_READ_COUNT, device);
1241         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1242         /* Locate record for the first 4 records on track 0. */
1243         ccw[-1].flags |= CCW_FLAG_CC;
1244         locate_record(ccw++, LO_data++, 0, 0, 4,
1245                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1246
1247         count_data = private->count_area;
1248         for (i = 0; i < 4; i++) {
1249                 ccw[-1].flags |= CCW_FLAG_CC;
1250                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1251                 ccw->flags = 0;
1252                 ccw->count = 8;
1253                 ccw->cda = (__u32)(addr_t) count_data;
1254                 ccw++;
1255                 count_data++;
1256         }
1257
1258         /* Locate record for the first record on track 2. */
1259         ccw[-1].flags |= CCW_FLAG_CC;
1260         locate_record(ccw++, LO_data++, 2, 0, 1,
1261                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1262         /* Read count ccw. */
1263         ccw[-1].flags |= CCW_FLAG_CC;
1264         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1265         ccw->flags = 0;
1266         ccw->count = 8;
1267         ccw->cda = (__u32)(addr_t) count_data;
1268
1269         cqr->block = NULL;
1270         cqr->startdev = device;
1271         cqr->memdev = device;
1272         cqr->retries = 0;
1273         cqr->buildclk = get_clock();
1274         cqr->status = DASD_CQR_FILLED;
1275         return cqr;
1276 }
1277
1278 /*
1279  * This is the callback function for the init_analysis cqr. It saves
1280  * the status of the initial analysis ccw before it frees it and kicks
1281  * the device to continue the startup sequence. This will call
1282  * dasd_eckd_do_analysis again (if the devices has not been marked
1283  * for deletion in the meantime).
1284  */
1285 static void
1286 dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, void *data)
1287 {
1288         struct dasd_eckd_private *private;
1289         struct dasd_device *device;
1290
1291         device = init_cqr->startdev;
1292         private = (struct dasd_eckd_private *) device->private;
1293         private->init_cqr_status = init_cqr->status;
1294         dasd_sfree_request(init_cqr, device);
1295         dasd_kick_device(device);
1296 }
1297
1298 static int
1299 dasd_eckd_start_analysis(struct dasd_block *block)
1300 {
1301         struct dasd_eckd_private *private;
1302         struct dasd_ccw_req *init_cqr;
1303
1304         private = (struct dasd_eckd_private *) block->base->private;
1305         init_cqr = dasd_eckd_analysis_ccw(block->base);
1306         if (IS_ERR(init_cqr))
1307                 return PTR_ERR(init_cqr);
1308         init_cqr->callback = dasd_eckd_analysis_callback;
1309         init_cqr->callback_data = NULL;
1310         init_cqr->expires = 5*HZ;
1311         dasd_add_request_head(init_cqr);
1312         return -EAGAIN;
1313 }
1314
1315 static int
1316 dasd_eckd_end_analysis(struct dasd_block *block)
1317 {
1318         struct dasd_device *device;
1319         struct dasd_eckd_private *private;
1320         struct eckd_count *count_area;
1321         unsigned int sb, blk_per_trk;
1322         int status, i;
1323
1324         device = block->base;
1325         private = (struct dasd_eckd_private *) device->private;
1326         status = private->init_cqr_status;
1327         private->init_cqr_status = -1;
1328         if (status != DASD_CQR_DONE) {
1329                 dev_warn(&device->cdev->dev,
1330                             "The DASD is not formatted\n");
1331                 return -EMEDIUMTYPE;
1332         }
1333
1334         private->uses_cdl = 1;
1335         /* Check Track 0 for Compatible Disk Layout */
1336         count_area = NULL;
1337         for (i = 0; i < 3; i++) {
1338                 if (private->count_area[i].kl != 4 ||
1339                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
1340                         private->uses_cdl = 0;
1341                         break;
1342                 }
1343         }
1344         if (i == 3)
1345                 count_area = &private->count_area[4];
1346
1347         if (private->uses_cdl == 0) {
1348                 for (i = 0; i < 5; i++) {
1349                         if ((private->count_area[i].kl != 0) ||
1350                             (private->count_area[i].dl !=
1351                              private->count_area[0].dl))
1352                                 break;
1353                 }
1354                 if (i == 5)
1355                         count_area = &private->count_area[0];
1356         } else {
1357                 if (private->count_area[3].record == 1)
1358                         dev_warn(&device->cdev->dev,
1359                                  "Track 0 has no records following the VTOC\n");
1360         }
1361         if (count_area != NULL && count_area->kl == 0) {
1362                 /* we found notthing violating our disk layout */
1363                 if (dasd_check_blocksize(count_area->dl) == 0)
1364                         block->bp_block = count_area->dl;
1365         }
1366         if (block->bp_block == 0) {
1367                 dev_warn(&device->cdev->dev,
1368                          "The disk layout of the DASD is not supported\n");
1369                 return -EMEDIUMTYPE;
1370         }
1371         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1372         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1373                 block->s2b_shift++;
1374
1375         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1376         block->blocks = (private->real_cyl *
1377                           private->rdc_data.trk_per_cyl *
1378                           blk_per_trk);
1379
1380         dev_info(&device->cdev->dev,
1381                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
1382                  "%s\n", (block->bp_block >> 10),
1383                  ((private->real_cyl *
1384                    private->rdc_data.trk_per_cyl *
1385                    blk_per_trk * (block->bp_block >> 9)) >> 1),
1386                  ((blk_per_trk * block->bp_block) >> 10),
1387                  private->uses_cdl ?
1388                  "compatible disk layout" : "linux disk layout");
1389
1390         return 0;
1391 }
1392
1393 static int dasd_eckd_do_analysis(struct dasd_block *block)
1394 {
1395         struct dasd_eckd_private *private;
1396
1397         private = (struct dasd_eckd_private *) block->base->private;
1398         if (private->init_cqr_status < 0)
1399                 return dasd_eckd_start_analysis(block);
1400         else
1401                 return dasd_eckd_end_analysis(block);
1402 }
1403
1404 static int dasd_eckd_ready_to_online(struct dasd_device *device)
1405 {
1406         return dasd_alias_add_device(device);
1407 };
1408
1409 static int dasd_eckd_online_to_ready(struct dasd_device *device)
1410 {
1411         return dasd_alias_remove_device(device);
1412 };
1413
1414 static int
1415 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
1416 {
1417         struct dasd_eckd_private *private;
1418
1419         private = (struct dasd_eckd_private *) block->base->private;
1420         if (dasd_check_blocksize(block->bp_block) == 0) {
1421                 geo->sectors = recs_per_track(&private->rdc_data,
1422                                               0, block->bp_block);
1423         }
1424         geo->cylinders = private->rdc_data.no_cyl;
1425         geo->heads = private->rdc_data.trk_per_cyl;
1426         return 0;
1427 }
1428
1429 static struct dasd_ccw_req *
1430 dasd_eckd_format_device(struct dasd_device * device,
1431                         struct format_data_t * fdata)
1432 {
1433         struct dasd_eckd_private *private;
1434         struct dasd_ccw_req *fcp;
1435         struct eckd_count *ect;
1436         struct ccw1 *ccw;
1437         void *data;
1438         int rpt;
1439         struct ch_t address;
1440         int cplength, datasize;
1441         int i;
1442         int intensity = 0;
1443         int r0_perm;
1444
1445         private = (struct dasd_eckd_private *) device->private;
1446         rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
1447         set_ch_t(&address,
1448                  fdata->start_unit / private->rdc_data.trk_per_cyl,
1449                  fdata->start_unit % private->rdc_data.trk_per_cyl);
1450
1451         /* Sanity checks. */
1452         if (fdata->start_unit >=
1453             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
1454                 dev_warn(&device->cdev->dev, "Start track number %d used in "
1455                          "formatting is too big\n", fdata->start_unit);
1456                 return ERR_PTR(-EINVAL);
1457         }
1458         if (fdata->start_unit > fdata->stop_unit) {
1459                 dev_warn(&device->cdev->dev, "Start track %d used in "
1460                          "formatting exceeds end track\n", fdata->start_unit);
1461                 return ERR_PTR(-EINVAL);
1462         }
1463         if (dasd_check_blocksize(fdata->blksize) != 0) {
1464                 dev_warn(&device->cdev->dev,
1465                          "The DASD cannot be formatted with block size %d\n",
1466                          fdata->blksize);
1467                 return ERR_PTR(-EINVAL);
1468         }
1469
1470         /*
1471          * fdata->intensity is a bit string that tells us what to do:
1472          *   Bit 0: write record zero
1473          *   Bit 1: write home address, currently not supported
1474          *   Bit 2: invalidate tracks
1475          *   Bit 3: use OS/390 compatible disk layout (cdl)
1476          *   Bit 4: do not allow storage subsystem to modify record zero
1477          * Only some bit combinations do make sense.
1478          */
1479         if (fdata->intensity & 0x10) {
1480                 r0_perm = 0;
1481                 intensity = fdata->intensity & ~0x10;
1482         } else {
1483                 r0_perm = 1;
1484                 intensity = fdata->intensity;
1485         }
1486         switch (intensity) {
1487         case 0x00:      /* Normal format */
1488         case 0x08:      /* Normal format, use cdl. */
1489                 cplength = 2 + rpt;
1490                 datasize = sizeof(struct DE_eckd_data) +
1491                         sizeof(struct LO_eckd_data) +
1492                         rpt * sizeof(struct eckd_count);
1493                 break;
1494         case 0x01:      /* Write record zero and format track. */
1495         case 0x09:      /* Write record zero and format track, use cdl. */
1496                 cplength = 3 + rpt;
1497                 datasize = sizeof(struct DE_eckd_data) +
1498                         sizeof(struct LO_eckd_data) +
1499                         sizeof(struct eckd_count) +
1500                         rpt * sizeof(struct eckd_count);
1501                 break;
1502         case 0x04:      /* Invalidate track. */
1503         case 0x0c:      /* Invalidate track, use cdl. */
1504                 cplength = 3;
1505                 datasize = sizeof(struct DE_eckd_data) +
1506                         sizeof(struct LO_eckd_data) +
1507                         sizeof(struct eckd_count);
1508                 break;
1509         default:
1510                 dev_warn(&device->cdev->dev, "An I/O control call used "
1511                          "incorrect flags 0x%x\n", fdata->intensity);
1512                 return ERR_PTR(-EINVAL);
1513         }
1514         /* Allocate the format ccw request. */
1515         fcp = dasd_smalloc_request(dasd_eckd_discipline.name,
1516                                    cplength, datasize, device);
1517         if (IS_ERR(fcp))
1518                 return fcp;
1519
1520         data = fcp->data;
1521         ccw = fcp->cpaddr;
1522
1523         switch (intensity & ~0x08) {
1524         case 0x00: /* Normal format. */
1525                 define_extent(ccw++, (struct DE_eckd_data *) data,
1526                               fdata->start_unit, fdata->start_unit,
1527                               DASD_ECKD_CCW_WRITE_CKD, device);
1528                 /* grant subsystem permission to format R0 */
1529                 if (r0_perm)
1530                         ((struct DE_eckd_data *)data)->ga_extended |= 0x04;
1531                 data += sizeof(struct DE_eckd_data);
1532                 ccw[-1].flags |= CCW_FLAG_CC;
1533                 locate_record(ccw++, (struct LO_eckd_data *) data,
1534                               fdata->start_unit, 0, rpt,
1535                               DASD_ECKD_CCW_WRITE_CKD, device,
1536                               fdata->blksize);
1537                 data += sizeof(struct LO_eckd_data);
1538                 break;
1539         case 0x01: /* Write record zero + format track. */
1540                 define_extent(ccw++, (struct DE_eckd_data *) data,
1541                               fdata->start_unit, fdata->start_unit,
1542                               DASD_ECKD_CCW_WRITE_RECORD_ZERO,
1543                               device);
1544                 data += sizeof(struct DE_eckd_data);
1545                 ccw[-1].flags |= CCW_FLAG_CC;
1546                 locate_record(ccw++, (struct LO_eckd_data *) data,
1547                               fdata->start_unit, 0, rpt + 1,
1548                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
1549                               device->block->bp_block);
1550                 data += sizeof(struct LO_eckd_data);
1551                 break;
1552         case 0x04: /* Invalidate track. */
1553                 define_extent(ccw++, (struct DE_eckd_data *) data,
1554                               fdata->start_unit, fdata->start_unit,
1555                               DASD_ECKD_CCW_WRITE_CKD, device);
1556                 data += sizeof(struct DE_eckd_data);
1557                 ccw[-1].flags |= CCW_FLAG_CC;
1558                 locate_record(ccw++, (struct LO_eckd_data *) data,
1559                               fdata->start_unit, 0, 1,
1560                               DASD_ECKD_CCW_WRITE_CKD, device, 8);
1561                 data += sizeof(struct LO_eckd_data);
1562                 break;
1563         }
1564         if (intensity & 0x01) { /* write record zero */
1565                 ect = (struct eckd_count *) data;
1566                 data += sizeof(struct eckd_count);
1567                 ect->cyl = address.cyl;
1568                 ect->head = address.head;
1569                 ect->record = 0;
1570                 ect->kl = 0;
1571                 ect->dl = 8;
1572                 ccw[-1].flags |= CCW_FLAG_CC;
1573                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
1574                 ccw->flags = CCW_FLAG_SLI;
1575                 ccw->count = 8;
1576                 ccw->cda = (__u32)(addr_t) ect;
1577                 ccw++;
1578         }
1579         if ((intensity & ~0x08) & 0x04) {       /* erase track */
1580                 ect = (struct eckd_count *) data;
1581                 data += sizeof(struct eckd_count);
1582                 ect->cyl = address.cyl;
1583                 ect->head = address.head;
1584                 ect->record = 1;
1585                 ect->kl = 0;
1586                 ect->dl = 0;
1587                 ccw[-1].flags |= CCW_FLAG_CC;
1588                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1589                 ccw->flags = CCW_FLAG_SLI;
1590                 ccw->count = 8;
1591                 ccw->cda = (__u32)(addr_t) ect;
1592         } else {                /* write remaining records */
1593                 for (i = 0; i < rpt; i++) {
1594                         ect = (struct eckd_count *) data;
1595                         data += sizeof(struct eckd_count);
1596                         ect->cyl = address.cyl;
1597                         ect->head = address.head;
1598                         ect->record = i + 1;
1599                         ect->kl = 0;
1600                         ect->dl = fdata->blksize;
1601                         /* Check for special tracks 0-1 when formatting CDL */
1602                         if ((intensity & 0x08) &&
1603                             fdata->start_unit == 0) {
1604                                 if (i < 3) {
1605                                         ect->kl = 4;
1606                                         ect->dl = sizes_trk0[i] - 4;
1607                                 }
1608                         }
1609                         if ((intensity & 0x08) &&
1610                             fdata->start_unit == 1) {
1611                                 ect->kl = 44;
1612                                 ect->dl = LABEL_SIZE - 44;
1613                         }
1614                         ccw[-1].flags |= CCW_FLAG_CC;
1615                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1616                         ccw->flags = CCW_FLAG_SLI;
1617                         ccw->count = 8;
1618                         ccw->cda = (__u32)(addr_t) ect;
1619                         ccw++;
1620                 }
1621         }
1622         fcp->startdev = device;
1623         fcp->memdev = device;
1624         clear_bit(DASD_CQR_FLAGS_USE_ERP, &fcp->flags);
1625         fcp->retries = 5;       /* set retry counter to enable default ERP */
1626         fcp->buildclk = get_clock();
1627         fcp->status = DASD_CQR_FILLED;
1628         return fcp;
1629 }
1630
1631 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
1632 {
1633         cqr->status = DASD_CQR_FILLED;
1634         if (cqr->block && (cqr->startdev != cqr->block->base)) {
1635                 dasd_eckd_reset_ccw_to_base_io(cqr);
1636                 cqr->startdev = cqr->block->base;
1637         }
1638 };
1639
1640 static dasd_erp_fn_t
1641 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
1642 {
1643         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
1644         struct ccw_device *cdev = device->cdev;
1645
1646         switch (cdev->id.cu_type) {
1647         case 0x3990:
1648         case 0x2105:
1649         case 0x2107:
1650         case 0x1750:
1651                 return dasd_3990_erp_action;
1652         case 0x9343:
1653         case 0x3880:
1654         default:
1655                 return dasd_default_erp_action;
1656         }
1657 }
1658
1659 static dasd_erp_fn_t
1660 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
1661 {
1662         return dasd_default_erp_postaction;
1663 }
1664
1665
1666 static void dasd_eckd_handle_unsolicited_interrupt(struct dasd_device *device,
1667                                                    struct irb *irb)
1668 {
1669         char mask;
1670         char *sense = NULL;
1671
1672         /* first of all check for state change pending interrupt */
1673         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
1674         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
1675                 dasd_generic_handle_state_change(device);
1676                 return;
1677         }
1678
1679         /* summary unit check */
1680         if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
1681             (irb->ecw[7] == 0x0D)) {
1682                 dasd_alias_handle_summary_unit_check(device, irb);
1683                 return;
1684         }
1685
1686         sense = dasd_get_sense(irb);
1687         /* service information message SIM */
1688         if (sense && !(sense[27] & DASD_SENSE_BIT_0) &&
1689             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
1690                 dasd_3990_erp_handle_sim(device, sense);
1691                 dasd_schedule_device_bh(device);
1692                 return;
1693         }
1694
1695         if ((scsw_cc(&irb->scsw) == 1) &&
1696             (scsw_fctl(&irb->scsw) & SCSW_FCTL_START_FUNC) &&
1697             (scsw_actl(&irb->scsw) & SCSW_ACTL_START_PEND) &&
1698             (scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND)) {
1699                 /* fake irb do nothing, they are handled elsewhere */
1700                 dasd_schedule_device_bh(device);
1701                 return;
1702         }
1703
1704         if (!sense) {
1705                 /* just report other unsolicited interrupts */
1706                 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1707                             "unsolicited interrupt received");
1708         } else {
1709                 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1710                             "unsolicited interrupt received "
1711                             "(sense available)");
1712                 device->discipline->dump_sense_dbf(device, NULL, irb,
1713                                                    "unsolicited");
1714         }
1715
1716         dasd_schedule_device_bh(device);
1717         return;
1718 };
1719
1720
1721 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
1722                                                struct dasd_device *startdev,
1723                                                struct dasd_block *block,
1724                                                struct request *req,
1725                                                sector_t first_rec,
1726                                                sector_t last_rec,
1727                                                sector_t first_trk,
1728                                                sector_t last_trk,
1729                                                unsigned int first_offs,
1730                                                unsigned int last_offs,
1731                                                unsigned int blk_per_trk,
1732                                                unsigned int blksize)
1733 {
1734         struct dasd_eckd_private *private;
1735         unsigned long *idaws;
1736         struct LO_eckd_data *LO_data;
1737         struct dasd_ccw_req *cqr;
1738         struct ccw1 *ccw;
1739         struct req_iterator iter;
1740         struct bio_vec *bv;
1741         char *dst;
1742         unsigned int off;
1743         int count, cidaw, cplength, datasize;
1744         sector_t recid;
1745         unsigned char cmd, rcmd;
1746         int use_prefix;
1747         struct dasd_device *basedev;
1748
1749         basedev = block->base;
1750         private = (struct dasd_eckd_private *) basedev->private;
1751         if (rq_data_dir(req) == READ)
1752                 cmd = DASD_ECKD_CCW_READ_MT;
1753         else if (rq_data_dir(req) == WRITE)
1754                 cmd = DASD_ECKD_CCW_WRITE_MT;
1755         else
1756                 return ERR_PTR(-EINVAL);
1757
1758         /* Check struct bio and count the number of blocks for the request. */
1759         count = 0;
1760         cidaw = 0;
1761         rq_for_each_segment(bv, req, iter) {
1762                 if (bv->bv_len & (blksize - 1))
1763                         /* Eckd can only do full blocks. */
1764                         return ERR_PTR(-EINVAL);
1765                 count += bv->bv_len >> (block->s2b_shift + 9);
1766 #if defined(CONFIG_64BIT)
1767                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
1768                         cidaw += bv->bv_len >> (block->s2b_shift + 9);
1769 #endif
1770         }
1771         /* Paranoia. */
1772         if (count != last_rec - first_rec + 1)
1773                 return ERR_PTR(-EINVAL);
1774
1775         /* use the prefix command if available */
1776         use_prefix = private->features.feature[8] & 0x01;
1777         if (use_prefix) {
1778                 /* 1x prefix + number of blocks */
1779                 cplength = 2 + count;
1780                 /* 1x prefix + cidaws*sizeof(long) */
1781                 datasize = sizeof(struct PFX_eckd_data) +
1782                         sizeof(struct LO_eckd_data) +
1783                         cidaw * sizeof(unsigned long);
1784         } else {
1785                 /* 1x define extent + 1x locate record + number of blocks */
1786                 cplength = 2 + count;
1787                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
1788                 datasize = sizeof(struct DE_eckd_data) +
1789                         sizeof(struct LO_eckd_data) +
1790                         cidaw * sizeof(unsigned long);
1791         }
1792         /* Find out the number of additional locate record ccws for cdl. */
1793         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
1794                 if (last_rec >= 2*blk_per_trk)
1795                         count = 2*blk_per_trk - first_rec;
1796                 cplength += count;
1797                 datasize += count*sizeof(struct LO_eckd_data);
1798         }
1799         /* Allocate the ccw request. */
1800         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1801                                    cplength, datasize, startdev);
1802         if (IS_ERR(cqr))
1803                 return cqr;
1804         ccw = cqr->cpaddr;
1805         /* First ccw is define extent or prefix. */
1806         if (use_prefix) {
1807                 if (prefix(ccw++, cqr->data, first_trk,
1808                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
1809                         /* Clock not in sync and XRC is enabled.
1810                          * Try again later.
1811                          */
1812                         dasd_sfree_request(cqr, startdev);
1813                         return ERR_PTR(-EAGAIN);
1814                 }
1815                 idaws = (unsigned long *) (cqr->data +
1816                                            sizeof(struct PFX_eckd_data));
1817         } else {
1818                 if (define_extent(ccw++, cqr->data, first_trk,
1819                                   last_trk, cmd, startdev) == -EAGAIN) {
1820                         /* Clock not in sync and XRC is enabled.
1821                          * Try again later.
1822                          */
1823                         dasd_sfree_request(cqr, startdev);
1824                         return ERR_PTR(-EAGAIN);
1825                 }
1826                 idaws = (unsigned long *) (cqr->data +
1827                                            sizeof(struct DE_eckd_data));
1828         }
1829         /* Build locate_record+read/write/ccws. */
1830         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
1831         recid = first_rec;
1832         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
1833                 /* Only standard blocks so there is just one locate record. */
1834                 ccw[-1].flags |= CCW_FLAG_CC;
1835                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
1836                               last_rec - recid + 1, cmd, basedev, blksize);
1837         }
1838         rq_for_each_segment(bv, req, iter) {
1839                 dst = page_address(bv->bv_page) + bv->bv_offset;
1840                 if (dasd_page_cache) {
1841                         char *copy = kmem_cache_alloc(dasd_page_cache,
1842                                                       GFP_DMA | __GFP_NOWARN);
1843                         if (copy && rq_data_dir(req) == WRITE)
1844                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
1845                         if (copy)
1846                                 dst = copy + bv->bv_offset;
1847                 }
1848                 for (off = 0; off < bv->bv_len; off += blksize) {
1849                         sector_t trkid = recid;
1850                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
1851                         rcmd = cmd;
1852                         count = blksize;
1853                         /* Locate record for cdl special block ? */
1854                         if (private->uses_cdl && recid < 2*blk_per_trk) {
1855                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
1856                                         rcmd |= 0x8;
1857                                         count = dasd_eckd_cdl_reclen(recid);
1858                                         if (count < blksize &&
1859                                             rq_data_dir(req) == READ)
1860                                                 memset(dst + count, 0xe5,
1861                                                        blksize - count);
1862                                 }
1863                                 ccw[-1].flags |= CCW_FLAG_CC;
1864                                 locate_record(ccw++, LO_data++,
1865                                               trkid, recoffs + 1,
1866                                               1, rcmd, basedev, count);
1867                         }
1868                         /* Locate record for standard blocks ? */
1869                         if (private->uses_cdl && recid == 2*blk_per_trk) {
1870                                 ccw[-1].flags |= CCW_FLAG_CC;
1871                                 locate_record(ccw++, LO_data++,
1872                                               trkid, recoffs + 1,
1873                                               last_rec - recid + 1,
1874                                               cmd, basedev, count);
1875                         }
1876                         /* Read/write ccw. */
1877                         ccw[-1].flags |= CCW_FLAG_CC;
1878                         ccw->cmd_code = rcmd;
1879                         ccw->count = count;
1880                         if (idal_is_needed(dst, blksize)) {
1881                                 ccw->cda = (__u32)(addr_t) idaws;
1882                                 ccw->flags = CCW_FLAG_IDA;
1883                                 idaws = idal_create_words(idaws, dst, blksize);
1884                         } else {
1885                                 ccw->cda = (__u32)(addr_t) dst;
1886                                 ccw->flags = 0;
1887                         }
1888                         ccw++;
1889                         dst += blksize;
1890                         recid++;
1891                 }
1892         }
1893         if (blk_noretry_request(req) ||
1894             block->base->features & DASD_FEATURE_FAILFAST)
1895                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1896         cqr->startdev = startdev;
1897         cqr->memdev = startdev;
1898         cqr->block = block;
1899         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
1900         cqr->lpm = private->path_data.ppm;
1901         cqr->retries = 256;
1902         cqr->buildclk = get_clock();
1903         cqr->status = DASD_CQR_FILLED;
1904         return cqr;
1905 }
1906
1907 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
1908                                                struct dasd_device *startdev,
1909                                                struct dasd_block *block,
1910                                                struct request *req,
1911                                                sector_t first_rec,
1912                                                sector_t last_rec,
1913                                                sector_t first_trk,
1914                                                sector_t last_trk,
1915                                                unsigned int first_offs,
1916                                                unsigned int last_offs,
1917                                                unsigned int blk_per_trk,
1918                                                unsigned int blksize)
1919 {
1920         struct dasd_eckd_private *private;
1921         unsigned long *idaws;
1922         struct dasd_ccw_req *cqr;
1923         struct ccw1 *ccw;
1924         struct req_iterator iter;
1925         struct bio_vec *bv;
1926         char *dst, *idaw_dst;
1927         unsigned int cidaw, cplength, datasize;
1928         unsigned int tlf;
1929         sector_t recid;
1930         unsigned char cmd;
1931         struct dasd_device *basedev;
1932         unsigned int trkcount, count, count_to_trk_end;
1933         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
1934         unsigned char new_track, end_idaw;
1935         sector_t trkid;
1936         unsigned int recoffs;
1937
1938         basedev = block->base;
1939         private = (struct dasd_eckd_private *) basedev->private;
1940         if (rq_data_dir(req) == READ)
1941                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
1942         else if (rq_data_dir(req) == WRITE)
1943                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
1944         else
1945                 return ERR_PTR(-EINVAL);
1946
1947         /* Track based I/O needs IDAWs for each page, and not just for
1948          * 64 bit addresses. We need additional idals for pages
1949          * that get filled from two tracks, so we use the number
1950          * of records as upper limit.
1951          */
1952         cidaw = last_rec - first_rec + 1;
1953         trkcount = last_trk - first_trk + 1;
1954
1955         /* 1x prefix + one read/write ccw per track */
1956         cplength = 1 + trkcount;
1957
1958         /* on 31-bit we need space for two 32 bit addresses per page
1959          * on 64-bit one 64 bit address
1960          */
1961         datasize = sizeof(struct PFX_eckd_data) +
1962                 cidaw * sizeof(unsigned long long);
1963
1964         /* Allocate the ccw request. */
1965         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1966                                    cplength, datasize, startdev);
1967         if (IS_ERR(cqr))
1968                 return cqr;
1969         ccw = cqr->cpaddr;
1970         /* transfer length factor: how many bytes to read from the last track */
1971         if (first_trk == last_trk)
1972                 tlf = last_offs - first_offs + 1;
1973         else
1974                 tlf = last_offs + 1;
1975         tlf *= blksize;
1976
1977         if (prefix_LRE(ccw++, cqr->data, first_trk,
1978                        last_trk, cmd, basedev, startdev,
1979                        1 /* format */, first_offs + 1,
1980                        trkcount, blksize,
1981                        tlf) == -EAGAIN) {
1982                 /* Clock not in sync and XRC is enabled.
1983                  * Try again later.
1984                  */
1985                 dasd_sfree_request(cqr, startdev);
1986                 return ERR_PTR(-EAGAIN);
1987         }
1988
1989         /*
1990          * The translation of request into ccw programs must meet the
1991          * following conditions:
1992          * - all idaws but the first and the last must address full pages
1993          *   (or 2K blocks on 31-bit)
1994          * - the scope of a ccw and it's idal ends with the track boundaries
1995          */
1996         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
1997         recid = first_rec;
1998         new_track = 1;
1999         end_idaw = 0;
2000         len_to_track_end = 0;
2001         idaw_dst = 0;
2002         idaw_len = 0;
2003         rq_for_each_segment(bv, req, iter) {
2004                 dst = page_address(bv->bv_page) + bv->bv_offset;
2005                 seg_len = bv->bv_len;
2006                 while (seg_len) {
2007                         if (new_track) {
2008                                 trkid = recid;
2009                                 recoffs = sector_div(trkid, blk_per_trk);
2010                                 count_to_trk_end = blk_per_trk - recoffs;
2011                                 count = min((last_rec - recid + 1),
2012                                             (sector_t)count_to_trk_end);
2013                                 len_to_track_end = count * blksize;
2014                                 ccw[-1].flags |= CCW_FLAG_CC;
2015                                 ccw->cmd_code = cmd;
2016                                 ccw->count = len_to_track_end;
2017                                 ccw->cda = (__u32)(addr_t)idaws;
2018                                 ccw->flags = CCW_FLAG_IDA;
2019                                 ccw++;
2020                                 recid += count;
2021                                 new_track = 0;
2022                         }
2023                         /* If we start a new idaw, everything is fine and the
2024                          * start of the new idaw is the start of this segment.
2025                          * If we continue an idaw, we must make sure that the
2026                          * current segment begins where the so far accumulated
2027                          * idaw ends
2028                          */
2029                         if (!idaw_dst)
2030                                 idaw_dst = dst;
2031                         if ((idaw_dst + idaw_len) != dst) {
2032                                 dasd_sfree_request(cqr, startdev);
2033                                 return ERR_PTR(-ERANGE);
2034                         }
2035                         part_len = min(seg_len, len_to_track_end);
2036                         seg_len -= part_len;
2037                         dst += part_len;
2038                         idaw_len += part_len;
2039                         len_to_track_end -= part_len;
2040                         /* collected memory area ends on an IDA_BLOCK border,
2041                          * -> create an idaw
2042                          * idal_create_words will handle cases where idaw_len
2043                          * is larger then IDA_BLOCK_SIZE
2044                          */
2045                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2046                                 end_idaw = 1;
2047                         /* We also need to end the idaw at track end */
2048                         if (!len_to_track_end) {
2049                                 new_track = 1;
2050                                 end_idaw = 1;
2051                         }
2052                         if (end_idaw) {
2053                                 idaws = idal_create_words(idaws, idaw_dst,
2054                                                           idaw_len);
2055                                 idaw_dst = 0;
2056                                 idaw_len = 0;
2057                                 end_idaw = 0;
2058                         }
2059                 }
2060         }
2061
2062         if (blk_noretry_request(req) ||
2063             block->base->features & DASD_FEATURE_FAILFAST)
2064                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2065         cqr->startdev = startdev;
2066         cqr->memdev = startdev;
2067         cqr->block = block;
2068         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
2069         cqr->lpm = private->path_data.ppm;
2070         cqr->retries = 256;
2071         cqr->buildclk = get_clock();
2072         cqr->status = DASD_CQR_FILLED;
2073         return cqr;
2074 }
2075
2076 static int prepare_itcw(struct itcw *itcw,
2077                         unsigned int trk, unsigned int totrk, int cmd,
2078                         struct dasd_device *basedev,
2079                         struct dasd_device *startdev,
2080                         unsigned int rec_on_trk, int count,
2081                         unsigned int blksize,
2082                         unsigned int total_data_size,
2083                         unsigned int tlf,
2084                         unsigned int blk_per_trk)
2085 {
2086         struct PFX_eckd_data pfxdata;
2087         struct dasd_eckd_private *basepriv, *startpriv;
2088         struct DE_eckd_data *dedata;
2089         struct LRE_eckd_data *lredata;
2090         struct dcw *dcw;
2091
2092         u32 begcyl, endcyl;
2093         u16 heads, beghead, endhead;
2094         u8 pfx_cmd;
2095
2096         int rc = 0;
2097         int sector = 0;
2098         int dn, d;
2099
2100
2101         /* setup prefix data */
2102         basepriv = (struct dasd_eckd_private *) basedev->private;
2103         startpriv = (struct dasd_eckd_private *) startdev->private;
2104         dedata = &pfxdata.define_extent;
2105         lredata = &pfxdata.locate_record;
2106
2107         memset(&pfxdata, 0, sizeof(pfxdata));
2108         pfxdata.format = 1; /* PFX with LRE */
2109         pfxdata.base_address = basepriv->ned->unit_addr;
2110         pfxdata.base_lss = basepriv->ned->ID;
2111         pfxdata.validity.define_extent = 1;
2112
2113         /* private uid is kept up to date, conf_data may be outdated */
2114         if (startpriv->uid.type != UA_BASE_DEVICE) {
2115                 pfxdata.validity.verify_base = 1;
2116                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2117                         pfxdata.validity.hyper_pav = 1;
2118         }
2119
2120         switch (cmd) {
2121         case DASD_ECKD_CCW_READ_TRACK_DATA:
2122                 dedata->mask.perm = 0x1;
2123                 dedata->attributes.operation = basepriv->attrib.operation;
2124                 dedata->blk_size = blksize;
2125                 dedata->ga_extended |= 0x42;
2126                 lredata->operation.orientation = 0x0;
2127                 lredata->operation.operation = 0x0C;
2128                 lredata->auxiliary.check_bytes = 0x01;
2129                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2130                 break;
2131         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2132                 dedata->mask.perm = 0x02;
2133                 dedata->attributes.operation = basepriv->attrib.operation;
2134                 dedata->blk_size = blksize;
2135                 rc = check_XRC_on_prefix(&pfxdata, basedev);
2136                 dedata->ga_extended |= 0x42;
2137                 lredata->operation.orientation = 0x0;
2138                 lredata->operation.operation = 0x3F;
2139                 lredata->extended_operation = 0x23;
2140                 lredata->auxiliary.check_bytes = 0x2;
2141                 pfx_cmd = DASD_ECKD_CCW_PFX;
2142                 break;
2143         default:
2144                 DBF_DEV_EVENT(DBF_ERR, basedev,
2145                               "prepare itcw, unknown opcode 0x%x", cmd);
2146                 BUG();
2147                 break;
2148         }
2149         if (rc)
2150                 return rc;
2151
2152         dedata->attributes.mode = 0x3;  /* ECKD */
2153
2154         heads = basepriv->rdc_data.trk_per_cyl;
2155         begcyl = trk / heads;
2156         beghead = trk % heads;
2157         endcyl = totrk / heads;
2158         endhead = totrk % heads;
2159
2160         /* check for sequential prestage - enhance cylinder range */
2161         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2162             dedata->attributes.operation == DASD_SEQ_ACCESS) {
2163
2164                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2165                         endcyl += basepriv->attrib.nr_cyl;
2166                 else
2167                         endcyl = (basepriv->real_cyl - 1);
2168         }
2169
2170         set_ch_t(&dedata->beg_ext, begcyl, beghead);
2171         set_ch_t(&dedata->end_ext, endcyl, endhead);
2172
2173         dedata->ep_format = 0x20; /* records per track is valid */
2174         dedata->ep_rec_per_track = blk_per_trk;
2175
2176         if (rec_on_trk) {
2177                 switch (basepriv->rdc_data.dev_type) {
2178                 case 0x3390:
2179                         dn = ceil_quot(blksize + 6, 232);
2180                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
2181                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
2182                         break;
2183                 case 0x3380:
2184                         d = 7 + ceil_quot(blksize + 12, 32);
2185                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
2186                         break;
2187                 }
2188         }
2189
2190         lredata->auxiliary.length_valid = 1;
2191         lredata->auxiliary.length_scope = 1;
2192         lredata->auxiliary.imbedded_ccw_valid = 1;
2193         lredata->length = tlf;
2194         lredata->imbedded_ccw = cmd;
2195         lredata->count = count;
2196         lredata->sector = sector;
2197         set_ch_t(&lredata->seek_addr, begcyl, beghead);
2198         lredata->search_arg.cyl = lredata->seek_addr.cyl;
2199         lredata->search_arg.head = lredata->seek_addr.head;
2200         lredata->search_arg.record = rec_on_trk;
2201
2202         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
2203                      &pfxdata, sizeof(pfxdata), total_data_size);
2204
2205         return rc;
2206 }
2207
2208 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
2209                                                struct dasd_device *startdev,
2210                                                struct dasd_block *block,
2211                                                struct request *req,
2212                                                sector_t first_rec,
2213                                                sector_t last_rec,
2214                                                sector_t first_trk,
2215                                                sector_t last_trk,
2216                                                unsigned int first_offs,
2217                                                unsigned int last_offs,
2218                                                unsigned int blk_per_trk,
2219                                                unsigned int blksize)
2220 {
2221         struct dasd_eckd_private *private;
2222         struct dasd_ccw_req *cqr;
2223         struct req_iterator iter;
2224         struct bio_vec *bv;
2225         char *dst;
2226         unsigned int trkcount, ctidaw;
2227         unsigned char cmd;
2228         struct dasd_device *basedev;
2229         unsigned int tlf;
2230         struct itcw *itcw;
2231         struct tidaw *last_tidaw = NULL;
2232         int itcw_op;
2233         size_t itcw_size;
2234
2235         basedev = block->base;
2236         private = (struct dasd_eckd_private *) basedev->private;
2237         if (rq_data_dir(req) == READ) {
2238                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2239                 itcw_op = ITCW_OP_READ;
2240         } else if (rq_data_dir(req) == WRITE) {
2241                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2242                 itcw_op = ITCW_OP_WRITE;
2243         } else
2244                 return ERR_PTR(-EINVAL);
2245
2246         /* trackbased I/O needs address all memory via TIDAWs,
2247          * not just for 64 bit addresses. This allows us to map
2248          * each segment directly to one tidaw.
2249          */
2250         trkcount = last_trk - first_trk + 1;
2251         ctidaw = 0;
2252         rq_for_each_segment(bv, req, iter) {
2253                 ++ctidaw;
2254         }
2255
2256         /* Allocate the ccw request. */
2257         itcw_size = itcw_calc_size(0, ctidaw, 0);
2258         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2259                                    0, itcw_size, startdev);
2260         if (IS_ERR(cqr))
2261                 return cqr;
2262
2263         cqr->cpmode = 1;
2264         cqr->startdev = startdev;
2265         cqr->memdev = startdev;
2266         cqr->block = block;
2267         cqr->expires = 100*HZ;
2268         cqr->buildclk = get_clock();
2269         cqr->status = DASD_CQR_FILLED;
2270         cqr->retries = 10;
2271
2272         /* transfer length factor: how many bytes to read from the last track */
2273         if (first_trk == last_trk)
2274                 tlf = last_offs - first_offs + 1;
2275         else
2276                 tlf = last_offs + 1;
2277         tlf *= blksize;
2278
2279         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
2280         cqr->cpaddr = itcw_get_tcw(itcw);
2281
2282         if (prepare_itcw(itcw, first_trk, last_trk,
2283                          cmd, basedev, startdev,
2284                          first_offs + 1,
2285                          trkcount, blksize,
2286                          (last_rec - first_rec + 1) * blksize,
2287                          tlf, blk_per_trk) == -EAGAIN) {
2288                 /* Clock not in sync and XRC is enabled.
2289                  * Try again later.
2290                  */
2291                 dasd_sfree_request(cqr, startdev);
2292                 return ERR_PTR(-EAGAIN);
2293         }
2294
2295         /*
2296          * A tidaw can address 4k of memory, but must not cross page boundaries
2297          * We can let the block layer handle this by setting
2298          * blk_queue_segment_boundary to page boundaries and
2299          * blk_max_segment_size to page size when setting up the request queue.
2300          */
2301         rq_for_each_segment(bv, req, iter) {
2302                 dst = page_address(bv->bv_page) + bv->bv_offset;
2303                 last_tidaw = itcw_add_tidaw(itcw, 0x00, dst, bv->bv_len);
2304                 if (IS_ERR(last_tidaw))
2305                         return (struct dasd_ccw_req *)last_tidaw;
2306         }
2307
2308         last_tidaw->flags |= 0x80;
2309         itcw_finalize(itcw);
2310
2311         if (blk_noretry_request(req) ||
2312             block->base->features & DASD_FEATURE_FAILFAST)
2313                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2314         cqr->startdev = startdev;
2315         cqr->memdev = startdev;
2316         cqr->block = block;
2317         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
2318         cqr->lpm = private->path_data.ppm;
2319         cqr->retries = 256;
2320         cqr->buildclk = get_clock();
2321         cqr->status = DASD_CQR_FILLED;
2322         return cqr;
2323 }
2324
2325 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
2326                                                struct dasd_block *block,
2327                                                struct request *req)
2328 {
2329         int tpm, cmdrtd, cmdwtd;
2330         int use_prefix;
2331
2332         struct dasd_eckd_private *private;
2333         int fcx_in_css, fcx_in_gneq, fcx_in_features;
2334         struct dasd_device *basedev;
2335         sector_t first_rec, last_rec;
2336         sector_t first_trk, last_trk;
2337         unsigned int first_offs, last_offs;
2338         unsigned int blk_per_trk, blksize;
2339         int cdlspecial;
2340         struct dasd_ccw_req *cqr;
2341
2342         basedev = block->base;
2343         private = (struct dasd_eckd_private *) basedev->private;
2344
2345         /* Calculate number of blocks/records per track. */
2346         blksize = block->bp_block;
2347         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2348         /* Calculate record id of first and last block. */
2349         first_rec = first_trk = req->sector >> block->s2b_shift;
2350         first_offs = sector_div(first_trk, blk_per_trk);
2351         last_rec = last_trk =
2352                 (req->sector + req->nr_sectors - 1) >> block->s2b_shift;
2353         last_offs = sector_div(last_trk, blk_per_trk);
2354         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
2355
2356         /* is transport mode supported ? */
2357         fcx_in_css = css_general_characteristics.fcx;
2358         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
2359         fcx_in_features = private->features.feature[40] & 0x80;
2360         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
2361
2362         /* is read track data and write track data in command mode supported? */
2363         cmdrtd = private->features.feature[9] & 0x20;
2364         cmdwtd = private->features.feature[12] & 0x40;
2365         use_prefix = private->features.feature[8] & 0x01;
2366
2367         cqr = NULL;
2368         if (cdlspecial || dasd_page_cache) {
2369                 /* do nothing, just fall through to the cmd mode single case */
2370         } else if (!dasd_nofcx && tpm && (first_trk == last_trk)) {
2371                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
2372                                                     first_rec, last_rec,
2373                                                     first_trk, last_trk,
2374                                                     first_offs, last_offs,
2375                                                     blk_per_trk, blksize);
2376                 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
2377                         cqr = NULL;
2378         } else if (use_prefix &&
2379                    (((rq_data_dir(req) == READ) && cmdrtd) ||
2380                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
2381                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
2382                                                    first_rec, last_rec,
2383                                                    first_trk, last_trk,
2384                                                    first_offs, last_offs,
2385                                                    blk_per_trk, blksize);
2386                 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
2387                         cqr = NULL;
2388         }
2389         if (!cqr)
2390                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
2391                                                     first_rec, last_rec,
2392                                                     first_trk, last_trk,
2393                                                     first_offs, last_offs,
2394                                                     blk_per_trk, blksize);
2395         return cqr;
2396 }
2397
2398 static int
2399 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
2400 {
2401         struct dasd_eckd_private *private;
2402         struct ccw1 *ccw;
2403         struct req_iterator iter;
2404         struct bio_vec *bv;
2405         char *dst, *cda;
2406         unsigned int blksize, blk_per_trk, off;
2407         sector_t recid;
2408         int status;
2409
2410         if (!dasd_page_cache)
2411                 goto out;
2412         private = (struct dasd_eckd_private *) cqr->block->base->private;
2413         blksize = cqr->block->bp_block;
2414         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2415         recid = req->sector >> cqr->block->s2b_shift;
2416         ccw = cqr->cpaddr;
2417         /* Skip over define extent & locate record. */
2418         ccw++;
2419         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
2420                 ccw++;
2421         rq_for_each_segment(bv, req, iter) {
2422                 dst = page_address(bv->bv_page) + bv->bv_offset;
2423                 for (off = 0; off < bv->bv_len; off += blksize) {
2424                         /* Skip locate record. */
2425                         if (private->uses_cdl && recid <= 2*blk_per_trk)
2426                                 ccw++;
2427                         if (dst) {
2428                                 if (ccw->flags & CCW_FLAG_IDA)
2429                                         cda = *((char **)((addr_t) ccw->cda));
2430                                 else
2431                                         cda = (char *)((addr_t) ccw->cda);
2432                                 if (dst != cda) {
2433                                         if (rq_data_dir(req) == READ)
2434                                                 memcpy(dst, cda, bv->bv_len);
2435                                         kmem_cache_free(dasd_page_cache,
2436                                             (void *)((addr_t)cda & PAGE_MASK));
2437                                 }
2438                                 dst = NULL;
2439                         }
2440                         ccw++;
2441                         recid++;
2442                 }
2443         }
2444 out:
2445         status = cqr->status == DASD_CQR_DONE;
2446         dasd_sfree_request(cqr, cqr->memdev);
2447         return status;
2448 }
2449
2450 /*
2451  * Modify ccw/tcw in cqr so it can be started on a base device.
2452  *
2453  * Note that this is not enough to restart the cqr!
2454  * Either reset cqr->startdev as well (summary unit check handling)
2455  * or restart via separate cqr (as in ERP handling).
2456  */
2457 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
2458 {
2459         struct ccw1 *ccw;
2460         struct PFX_eckd_data *pfxdata;
2461         struct tcw *tcw;
2462         struct tccb *tccb;
2463         struct dcw *dcw;
2464
2465         if (cqr->cpmode == 1) {
2466                 tcw = cqr->cpaddr;
2467                 tccb = tcw_get_tccb(tcw);
2468                 dcw = (struct dcw *)&tccb->tca[0];
2469                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
2470                 pfxdata->validity.verify_base = 0;
2471                 pfxdata->validity.hyper_pav = 0;
2472         } else {
2473                 ccw = cqr->cpaddr;
2474                 pfxdata = cqr->data;
2475                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
2476                         pfxdata->validity.verify_base = 0;
2477                         pfxdata->validity.hyper_pav = 0;
2478                 }
2479         }
2480 }
2481
2482 #define DASD_ECKD_CHANQ_MAX_SIZE 4
2483
2484 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
2485                                                      struct dasd_block *block,
2486                                                      struct request *req)
2487 {
2488         struct dasd_eckd_private *private;
2489         struct dasd_device *startdev;
2490         unsigned long flags;
2491         struct dasd_ccw_req *cqr;
2492
2493         startdev = dasd_alias_get_start_dev(base);
2494         if (!startdev)
2495                 startdev = base;
2496         private = (struct dasd_eckd_private *) startdev->private;
2497         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
2498                 return ERR_PTR(-EBUSY);
2499
2500         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
2501         private->count++;
2502         cqr = dasd_eckd_build_cp(startdev, block, req);
2503         if (IS_ERR(cqr))
2504                 private->count--;
2505         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
2506         return cqr;
2507 }
2508
2509 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
2510                                    struct request *req)
2511 {
2512         struct dasd_eckd_private *private;
2513         unsigned long flags;
2514
2515         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
2516         private = (struct dasd_eckd_private *) cqr->memdev->private;
2517         private->count--;
2518         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
2519         return dasd_eckd_free_cp(cqr, req);
2520 }
2521
2522 static int
2523 dasd_eckd_fill_info(struct dasd_device * device,
2524                     struct dasd_information2_t * info)
2525 {
2526         struct dasd_eckd_private *private;
2527
2528         private = (struct dasd_eckd_private *) device->private;
2529         info->label_block = 2;
2530         info->FBA_layout = private->uses_cdl ? 0 : 1;
2531         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
2532         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
2533         memcpy(info->characteristics, &private->rdc_data,
2534                sizeof(struct dasd_eckd_characteristics));
2535         info->confdata_size = min((unsigned long)private->conf_len,
2536                                   sizeof(info->configuration_data));
2537         memcpy(info->configuration_data, private->conf_data,
2538                info->confdata_size);
2539         return 0;
2540 }
2541
2542 /*
2543  * SECTION: ioctl functions for eckd devices.
2544  */
2545
2546 /*
2547  * Release device ioctl.
2548  * Buils a channel programm to releases a prior reserved
2549  * (see dasd_eckd_reserve) device.
2550  */
2551 static int
2552 dasd_eckd_release(struct dasd_device *device)
2553 {
2554         struct dasd_ccw_req *cqr;
2555         int rc;
2556         struct ccw1 *ccw;
2557
2558         if (!capable(CAP_SYS_ADMIN))
2559                 return -EACCES;
2560
2561         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2562                                    1, 32, device);
2563         if (IS_ERR(cqr)) {
2564                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2565                             "Could not allocate initialization request");
2566                 return PTR_ERR(cqr);
2567         }
2568         ccw = cqr->cpaddr;
2569         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
2570         ccw->flags |= CCW_FLAG_SLI;
2571         ccw->count = 32;
2572         ccw->cda = (__u32)(addr_t) cqr->data;
2573         cqr->startdev = device;
2574         cqr->memdev = device;
2575         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2576         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2577         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2578         cqr->expires = 2 * HZ;
2579         cqr->buildclk = get_clock();
2580         cqr->status = DASD_CQR_FILLED;
2581
2582         rc = dasd_sleep_on_immediatly(cqr);
2583
2584         dasd_sfree_request(cqr, cqr->memdev);
2585         return rc;
2586 }
2587
2588 /*
2589  * Reserve device ioctl.
2590  * Options are set to 'synchronous wait for interrupt' and
2591  * 'timeout the request'. This leads to a terminate IO if
2592  * the interrupt is outstanding for a certain time.
2593  */
2594 static int
2595 dasd_eckd_reserve(struct dasd_device *device)
2596 {
2597         struct dasd_ccw_req *cqr;
2598         int rc;
2599         struct ccw1 *ccw;
2600
2601         if (!capable(CAP_SYS_ADMIN))
2602                 return -EACCES;
2603
2604         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2605                                    1, 32, device);
2606         if (IS_ERR(cqr)) {
2607                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2608                             "Could not allocate initialization request");
2609                 return PTR_ERR(cqr);
2610         }
2611         ccw = cqr->cpaddr;
2612         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
2613         ccw->flags |= CCW_FLAG_SLI;
2614         ccw->count = 32;
2615         ccw->cda = (__u32)(addr_t) cqr->data;
2616         cqr->startdev = device;
2617         cqr->memdev = device;
2618         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2619         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2620         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2621         cqr->expires = 2 * HZ;
2622         cqr->buildclk = get_clock();
2623         cqr->status = DASD_CQR_FILLED;
2624
2625         rc = dasd_sleep_on_immediatly(cqr);
2626
2627         dasd_sfree_request(cqr, cqr->memdev);
2628         return rc;
2629 }
2630
2631 /*
2632  * Steal lock ioctl - unconditional reserve device.
2633  * Buils a channel programm to break a device's reservation.
2634  * (unconditional reserve)
2635  */
2636 static int
2637 dasd_eckd_steal_lock(struct dasd_device *device)
2638 {
2639         struct dasd_ccw_req *cqr;
2640         int rc;
2641         struct ccw1 *ccw;
2642
2643         if (!capable(CAP_SYS_ADMIN))
2644                 return -EACCES;
2645
2646         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2647                                    1, 32, device);
2648         if (IS_ERR(cqr)) {
2649                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2650                             "Could not allocate initialization request");
2651                 return PTR_ERR(cqr);
2652         }
2653         ccw = cqr->cpaddr;
2654         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
2655         ccw->flags |= CCW_FLAG_SLI;
2656         ccw->count = 32;
2657         ccw->cda = (__u32)(addr_t) cqr->data;
2658         cqr->startdev = device;
2659         cqr->memdev = device;
2660         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2661         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2662         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2663         cqr->expires = 2 * HZ;
2664         cqr->buildclk = get_clock();
2665         cqr->status = DASD_CQR_FILLED;
2666
2667         rc = dasd_sleep_on_immediatly(cqr);
2668
2669         dasd_sfree_request(cqr, cqr->memdev);
2670         return rc;
2671 }
2672
2673 /*
2674  * Read performance statistics
2675  */
2676 static int
2677 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
2678 {
2679         struct dasd_psf_prssd_data *prssdp;
2680         struct dasd_rssd_perf_stats_t *stats;
2681         struct dasd_ccw_req *cqr;
2682         struct ccw1 *ccw;
2683         int rc;
2684
2685         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2686                                    1 /* PSF */  + 1 /* RSSD */ ,
2687                                    (sizeof(struct dasd_psf_prssd_data) +
2688                                     sizeof(struct dasd_rssd_perf_stats_t)),
2689                                    device);
2690         if (IS_ERR(cqr)) {
2691                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2692                             "Could not allocate initialization request");
2693                 return PTR_ERR(cqr);
2694         }
2695         cqr->startdev = device;
2696         cqr->memdev = device;
2697         cqr->retries = 0;
2698         cqr->expires = 10 * HZ;
2699
2700         /* Prepare for Read Subsystem Data */
2701         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
2702         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
2703         prssdp->order = PSF_ORDER_PRSSD;
2704         prssdp->suborder = 0x01;        /* Performance Statistics */
2705         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
2706
2707         ccw = cqr->cpaddr;
2708         ccw->cmd_code = DASD_ECKD_CCW_PSF;
2709         ccw->count = sizeof(struct dasd_psf_prssd_data);
2710         ccw->flags |= CCW_FLAG_CC;
2711         ccw->cda = (__u32)(addr_t) prssdp;
2712
2713         /* Read Subsystem Data - Performance Statistics */
2714         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
2715         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
2716
2717         ccw++;
2718         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
2719         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
2720         ccw->cda = (__u32)(addr_t) stats;
2721
2722         cqr->buildclk = get_clock();
2723         cqr->status = DASD_CQR_FILLED;
2724         rc = dasd_sleep_on(cqr);
2725         if (rc == 0) {
2726                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
2727                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
2728                 if (copy_to_user(argp, stats,
2729                                  sizeof(struct dasd_rssd_perf_stats_t)))
2730                         rc = -EFAULT;
2731         }
2732         dasd_sfree_request(cqr, cqr->memdev);
2733         return rc;
2734 }
2735
2736 /*
2737  * Get attributes (cache operations)
2738  * Returnes the cache attributes used in Define Extend (DE).
2739  */
2740 static int
2741 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
2742 {
2743         struct dasd_eckd_private *private =
2744                 (struct dasd_eckd_private *)device->private;
2745         struct attrib_data_t attrib = private->attrib;
2746         int rc;
2747
2748         if (!capable(CAP_SYS_ADMIN))
2749                 return -EACCES;
2750         if (!argp)
2751                 return -EINVAL;
2752
2753         rc = 0;
2754         if (copy_to_user(argp, (long *) &attrib,
2755                          sizeof(struct attrib_data_t)))
2756                 rc = -EFAULT;
2757
2758         return rc;
2759 }
2760
2761 /*
2762  * Set attributes (cache operations)
2763  * Stores the attributes for cache operation to be used in Define Extend (DE).
2764  */
2765 static int
2766 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
2767 {
2768         struct dasd_eckd_private *private =
2769                 (struct dasd_eckd_private *)device->private;
2770         struct attrib_data_t attrib;
2771
2772         if (!capable(CAP_SYS_ADMIN))
2773                 return -EACCES;
2774         if (!argp)
2775                 return -EINVAL;
2776
2777         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
2778                 return -EFAULT;
2779         private->attrib = attrib;
2780
2781         dev_info(&device->cdev->dev,
2782                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
2783                  private->attrib.operation, private->attrib.nr_cyl);
2784         return 0;
2785 }
2786
2787 /*
2788  * Issue syscall I/O to EMC Symmetrix array.
2789  * CCWs are PSF and RSSD
2790  */
2791 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
2792 {
2793         struct dasd_symmio_parms usrparm;
2794         char *psf_data, *rssd_result;
2795         struct dasd_ccw_req *cqr;
2796         struct ccw1 *ccw;
2797         int rc;
2798
2799         /* Copy parms from caller */
2800         rc = -EFAULT;
2801         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
2802                 goto out;
2803 #ifndef CONFIG_64BIT
2804         /* Make sure pointers are sane even on 31 bit. */
2805         if ((usrparm.psf_data >> 32) != 0 || (usrparm.rssd_result >> 32) != 0) {
2806                 rc = -EINVAL;
2807                 goto out;
2808         }
2809 #endif
2810         /* alloc I/O data area */
2811         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
2812         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
2813         if (!psf_data || !rssd_result) {
2814                 rc = -ENOMEM;
2815                 goto out_free;
2816         }
2817
2818         /* get syscall header from user space */
2819         rc = -EFAULT;
2820         if (copy_from_user(psf_data,
2821                            (void __user *)(unsigned long) usrparm.psf_data,
2822                            usrparm.psf_data_len))
2823                 goto out_free;
2824
2825         /* sanity check on syscall header */
2826         if (psf_data[0] != 0x17 && psf_data[1] != 0xce) {
2827                 rc = -EINVAL;
2828                 goto out_free;
2829         }
2830
2831         /* setup CCWs for PSF + RSSD */
2832         cqr = dasd_smalloc_request("ECKD", 2 , 0, device);
2833         if (IS_ERR(cqr)) {
2834                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2835                         "Could not allocate initialization request");
2836                 rc = PTR_ERR(cqr);
2837                 goto out_free;
2838         }
2839
2840         cqr->startdev = device;
2841         cqr->memdev = device;
2842         cqr->retries = 3;
2843         cqr->expires = 10 * HZ;
2844         cqr->buildclk = get_clock();
2845         cqr->status = DASD_CQR_FILLED;
2846
2847         /* Build the ccws */
2848         ccw = cqr->cpaddr;
2849
2850         /* PSF ccw */
2851         ccw->cmd_code = DASD_ECKD_CCW_PSF;
2852         ccw->count = usrparm.psf_data_len;
2853         ccw->flags |= CCW_FLAG_CC;
2854         ccw->cda = (__u32)(addr_t) psf_data;
2855
2856         ccw++;
2857
2858         /* RSSD ccw  */
2859         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
2860         ccw->count = usrparm.rssd_result_len;
2861         ccw->flags = CCW_FLAG_SLI ;
2862         ccw->cda = (__u32)(addr_t) rssd_result;
2863
2864         rc = dasd_sleep_on(cqr);
2865         if (rc)
2866                 goto out_sfree;
2867
2868         rc = -EFAULT;
2869         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
2870                            rssd_result, usrparm.rssd_result_len))
2871                 goto out_sfree;
2872         rc = 0;
2873
2874 out_sfree:
2875         dasd_sfree_request(cqr, cqr->memdev);
2876 out_free:
2877         kfree(rssd_result);
2878         kfree(psf_data);
2879 out:
2880         DBF_DEV_EVENT(DBF_WARNING, device, "Symmetrix ioctl: rc=%d", rc);
2881         return rc;
2882 }
2883
2884 static int
2885 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
2886 {
2887         struct dasd_device *device = block->base;
2888
2889         switch (cmd) {
2890         case BIODASDGATTR:
2891                 return dasd_eckd_get_attrib(device, argp);
2892         case BIODASDSATTR:
2893                 return dasd_eckd_set_attrib(device, argp);
2894         case BIODASDPSRD:
2895                 return dasd_eckd_performance(device, argp);
2896         case BIODASDRLSE:
2897                 return dasd_eckd_release(device);
2898         case BIODASDRSRV:
2899                 return dasd_eckd_reserve(device);
2900         case BIODASDSLCK:
2901                 return dasd_eckd_steal_lock(device);
2902         case BIODASDSYMMIO:
2903                 return dasd_symm_io(device, argp);
2904         default:
2905                 return -ENOIOCTLCMD;
2906         }
2907 }
2908
2909 /*
2910  * Dump the range of CCWs into 'page' buffer
2911  * and return number of printed chars.
2912  */
2913 static int
2914 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
2915 {
2916         int len, count;
2917         char *datap;
2918
2919         len = 0;
2920         while (from <= to) {
2921                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2922                                " CCW %p: %08X %08X DAT:",
2923                                from, ((int *) from)[0], ((int *) from)[1]);
2924
2925                 /* get pointer to data (consider IDALs) */
2926                 if (from->flags & CCW_FLAG_IDA)
2927                         datap = (char *) *((addr_t *) (addr_t) from->cda);
2928                 else
2929                         datap = (char *) ((addr_t) from->cda);
2930
2931                 /* dump data (max 32 bytes) */
2932                 for (count = 0; count < from->count && count < 32; count++) {
2933                         if (count % 8 == 0) len += sprintf(page + len, " ");
2934                         if (count % 4 == 0) len += sprintf(page + len, " ");
2935                         len += sprintf(page + len, "%02x", datap[count]);
2936                 }
2937                 len += sprintf(page + len, "\n");
2938                 from++;
2939         }
2940         return len;
2941 }
2942
2943 static void
2944 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct dasd_ccw_req *req,
2945                          struct irb *irb, char *reason)
2946 {
2947         u64 *sense;
2948         int sl;
2949         struct tsb *tsb;
2950
2951         sense = NULL;
2952         tsb = NULL;
2953         if (req && scsw_is_tm(&req->irb.scsw)) {
2954                 if (irb->scsw.tm.tcw)
2955                         tsb = tcw_get_tsb(
2956                                 (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
2957                 if (tsb && (irb->scsw.tm.fcxs == 0x01)) {
2958                         switch (tsb->flags & 0x07) {
2959                         case 1: /* tsa_iostat */
2960                                 sense = (u64 *)tsb->tsa.iostat.sense;
2961                         break;
2962                         case 2: /* ts_ddpc */
2963                                 sense = (u64 *)tsb->tsa.ddpc.sense;
2964                         break;
2965                         case 3: /* tsa_intrg */
2966                         break;
2967                         }
2968                 }
2969         } else {
2970                 if (irb->esw.esw0.erw.cons)
2971                         sense = (u64 *)irb->ecw;
2972         }
2973         if (sense) {
2974                 for (sl = 0; sl < 4; sl++) {
2975                         DBF_DEV_EVENT(DBF_EMERG, device,
2976                                       "%s: %016llx %016llx %016llx %016llx",
2977                                       reason, sense[0], sense[1], sense[2],
2978                                       sense[3]);
2979                 }
2980         } else {
2981                 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
2982                               "SORRY - NO VALID SENSE AVAILABLE\n");
2983         }
2984 }
2985
2986 /*
2987  * Print sense data and related channel program.
2988  * Parts are printed because printk buffer is only 1024 bytes.
2989  */
2990 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
2991                                  struct dasd_ccw_req *req, struct irb *irb)
2992 {
2993         char *page;
2994         struct ccw1 *first, *last, *fail, *from, *to;
2995         int len, sl, sct;
2996
2997         page = (char *) get_zeroed_page(GFP_ATOMIC);
2998         if (page == NULL) {
2999                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3000                               "No memory to dump sense data\n");
3001                 return;
3002         }
3003         /* dump the sense data */
3004         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3005                       " I/O status report for device %s:\n",
3006                       dev_name(&device->cdev->dev));
3007         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3008                        " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
3009                        scsw_cstat(&irb->scsw), scsw_dstat(&irb->scsw));
3010         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3011                        " device %s: Failing CCW: %p\n",
3012                        dev_name(&device->cdev->dev),
3013                        (void *) (addr_t) irb->scsw.cmd.cpa);
3014         if (irb->esw.esw0.erw.cons) {
3015                 for (sl = 0; sl < 4; sl++) {
3016                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3017                                        " Sense(hex) %2d-%2d:",
3018                                        (8 * sl), ((8 * sl) + 7));
3019
3020                         for (sct = 0; sct < 8; sct++) {
3021                                 len += sprintf(page + len, " %02x",
3022                                                irb->ecw[8 * sl + sct]);
3023                         }
3024                         len += sprintf(page + len, "\n");
3025                 }
3026
3027                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
3028                         /* 24 Byte Sense Data */
3029                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3030                                 " 24 Byte: %x MSG %x, "
3031                                 "%s MSGb to SYSOP\n",
3032                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
3033                                 irb->ecw[1] & 0x10 ? "" : "no");
3034                 } else {
3035                         /* 32 Byte Sense Data */
3036                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3037                                 " 32 Byte: Format: %x "
3038                                 "Exception class %x\n",
3039                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
3040                 }
3041         } else {
3042                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3043                         " SORRY - NO VALID SENSE AVAILABLE\n");
3044         }
3045         printk("%s", page);
3046
3047         if (req) {
3048                 /* req == NULL for unsolicited interrupts */
3049                 /* dump the Channel Program (max 140 Bytes per line) */
3050                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
3051                 first = req->cpaddr;
3052                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
3053                 to = min(first + 6, last);
3054                 len = sprintf(page,  KERN_ERR PRINTK_HEADER
3055                               " Related CP in req: %p\n", req);
3056                 dasd_eckd_dump_ccw_range(first, to, page + len);
3057                 printk("%s", page);
3058
3059                 /* print failing CCW area (maximum 4) */
3060                 /* scsw->cda is either valid or zero  */
3061                 len = 0;
3062                 from = ++to;
3063                 fail = (struct ccw1 *)(addr_t)
3064                                 irb->scsw.cmd.cpa; /* failing CCW */
3065                 if (from <  fail - 2) {
3066                         from = fail - 2;     /* there is a gap - print header */
3067                         len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
3068                 }
3069                 to = min(fail + 1, last);
3070                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
3071
3072                 /* print last CCWs (maximum 2) */
3073                 from = max(from, ++to);
3074                 if (from < last - 1) {
3075                         from = last - 1;     /* there is a gap - print header */
3076                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
3077                 }
3078                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
3079                 if (len > 0)
3080                         printk("%s", page);
3081         }
3082         free_page((unsigned long) page);
3083 }
3084
3085
3086 /*
3087  * Print sense data from a tcw.
3088  */
3089 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
3090                                  struct dasd_ccw_req *req, struct irb *irb)
3091 {
3092         char *page;
3093         int len, sl, sct, residual;
3094
3095         struct tsb *tsb;
3096         u8 *sense;
3097
3098
3099         page = (char *) get_zeroed_page(GFP_ATOMIC);
3100         if (page == NULL) {
3101                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
3102                             "No memory to dump sense data");
3103                 return;
3104         }
3105         /* dump the sense data */
3106         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3107                       " I/O status report for device %s:\n",
3108                       dev_name(&device->cdev->dev));
3109         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3110                        " in req: %p CS: 0x%02X DS: 0x%02X "
3111                        "fcxs: 0x%02X schxs: 0x%02X\n", req,
3112                        scsw_cstat(&irb->scsw), scsw_dstat(&irb->scsw),
3113                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs);
3114         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3115                        " device %s: Failing TCW: %p\n",
3116                        dev_name(&device->cdev->dev),
3117                        (void *) (addr_t) irb->scsw.tm.tcw);
3118
3119         tsb = NULL;
3120         sense = NULL;
3121         if (irb->scsw.tm.tcw)
3122                 tsb = tcw_get_tsb(
3123                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
3124
3125         if (tsb && (irb->scsw.tm.fcxs == 0x01)) {
3126                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3127                                " tsb->length %d\n", tsb->length);
3128                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3129                                " tsb->flags %x\n", tsb->flags);
3130                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3131                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
3132                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3133                                " tsb->count %d\n", tsb->count);
3134                 residual = tsb->count - 28;
3135                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3136                                " residual %d\n", residual);
3137
3138                 switch (tsb->flags & 0x07) {
3139                 case 1: /* tsa_iostat */
3140                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3141                                " tsb->tsa.iostat.dev_time %d\n",
3142                                        tsb->tsa.iostat.dev_time);
3143                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3144                                " tsb->tsa.iostat.def_time %d\n",
3145                                        tsb->tsa.iostat.def_time);
3146                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3147                                " tsb->tsa.iostat.queue_time %d\n",
3148                                        tsb->tsa.iostat.queue_time);
3149                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3150                                " tsb->tsa.iostat.dev_busy_time %d\n",
3151                                        tsb->tsa.iostat.dev_busy_time);
3152                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3153                                " tsb->tsa.iostat.dev_act_time %d\n",
3154                                        tsb->tsa.iostat.dev_act_time);
3155                         sense = tsb->tsa.iostat.sense;
3156                         break;
3157                 case 2: /* ts_ddpc */
3158                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3159                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
3160                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3161                                " tsb->tsa.ddpc.rcq:  ");
3162                         for (sl = 0; sl < 16; sl++) {
3163                                 for (sct = 0; sct < 8; sct++) {
3164                                         len += sprintf(page + len, " %02x",
3165                                                        tsb->tsa.ddpc.rcq[sl]);
3166                                 }
3167                                 len += sprintf(page + len, "\n");
3168                         }
3169                         sense = tsb->tsa.ddpc.sense;
3170                         break;
3171                 case 3: /* tsa_intrg */
3172                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3173                                       " tsb->tsa.intrg.: not supportet yet \n");
3174                         break;
3175                 }
3176
3177                 if (sense) {
3178                         for (sl = 0; sl < 4; sl++) {
3179                                 len += sprintf(page + len,
3180                                                KERN_ERR PRINTK_HEADER
3181                                                " Sense(hex) %2d-%2d:",
3182                                                (8 * sl), ((8 * sl) + 7));
3183                                 for (sct = 0; sct < 8; sct++) {
3184                                         len += sprintf(page + len, " %02x",
3185                                                        sense[8 * sl + sct]);
3186                                 }
3187                                 len += sprintf(page + len, "\n");
3188                         }
3189
3190                         if (sense[27] & DASD_SENSE_BIT_0) {
3191                                 /* 24 Byte Sense Data */
3192                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3193                                         " 24 Byte: %x MSG %x, "
3194                                         "%s MSGb to SYSOP\n",
3195                                         sense[7] >> 4, sense[7] & 0x0f,
3196                                         sense[1] & 0x10 ? "" : "no");
3197                         } else {
3198                                 /* 32 Byte Sense Data */
3199                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3200                                         " 32 Byte: Format: %x "
3201                                         "Exception class %x\n",
3202                                         sense[6] & 0x0f, sense[22] >> 4);
3203                         }
3204                 } else {
3205                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3206                                 " SORRY - NO VALID SENSE AVAILABLE\n");
3207                 }
3208         } else {
3209                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3210                         " SORRY - NO TSB DATA AVAILABLE\n");
3211         }
3212         printk("%s", page);
3213         free_page((unsigned long) page);
3214 }
3215
3216 static void dasd_eckd_dump_sense(struct dasd_device *device,
3217                                  struct dasd_ccw_req *req, struct irb *irb)
3218 {
3219         if (req && scsw_is_tm(&req->irb.scsw))
3220                 dasd_eckd_dump_sense_tcw(device, req, irb);
3221         else
3222                 dasd_eckd_dump_sense_ccw(device, req, irb);
3223 }
3224
3225
3226 /*
3227  * max_blocks is dependent on the amount of storage that is available
3228  * in the static io buffer for each device. Currently each device has
3229  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
3230  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
3231  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
3232  * addition we have one define extent ccw + 16 bytes of data and one
3233  * locate record ccw + 16 bytes of data. That makes:
3234  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
3235  * We want to fit two into the available memory so that we can immediately
3236  * start the next request if one finishes off. That makes 249.5 blocks
3237  * for one request. Give a little safety and the result is 240.
3238  */
3239 static struct dasd_discipline dasd_eckd_discipline = {
3240         .owner = THIS_MODULE,
3241         .name = "ECKD",
3242         .ebcname = "ECKD",
3243         .max_blocks = 240,
3244         .check_device = dasd_eckd_check_characteristics,
3245         .uncheck_device = dasd_eckd_uncheck_device,
3246         .do_analysis = dasd_eckd_do_analysis,
3247         .ready_to_online = dasd_eckd_ready_to_online,
3248         .online_to_ready = dasd_eckd_online_to_ready,
3249         .fill_geometry = dasd_eckd_fill_geometry,
3250         .start_IO = dasd_start_IO,
3251         .term_IO = dasd_term_IO,
3252         .handle_terminated_request = dasd_eckd_handle_terminated_request,
3253         .format_device = dasd_eckd_format_device,
3254         .erp_action = dasd_eckd_erp_action,
3255         .erp_postaction = dasd_eckd_erp_postaction,
3256         .handle_unsolicited_interrupt = dasd_eckd_handle_unsolicited_interrupt,
3257         .build_cp = dasd_eckd_build_alias_cp,
3258         .free_cp = dasd_eckd_free_alias_cp,
3259         .dump_sense = dasd_eckd_dump_sense,
3260         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
3261         .fill_info = dasd_eckd_fill_info,
3262         .ioctl = dasd_eckd_ioctl,
3263 };
3264
3265 static int __init
3266 dasd_eckd_init(void)
3267 {
3268         ASCEBC(dasd_eckd_discipline.ebcname, 4);
3269         return ccw_driver_register(&dasd_eckd_driver);
3270 }
3271
3272 static void __exit
3273 dasd_eckd_cleanup(void)
3274 {
3275         ccw_driver_unregister(&dasd_eckd_driver);
3276 }
3277
3278 module_init(dasd_eckd_init);
3279 module_exit(dasd_eckd_cleanup);