drivers/s390/block/dasd_eckd.c

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_eckd.c
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5  *                  Carsten Otte <Cotte@de.ibm.com>
   6  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  * Bugreports.to..: <Linux390@de.ibm.com>
   8  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
   9  *
  10  */
  11
  12 #include <linux/stddef.h>
  13 #include <linux/kernel.h>
  14 #include <linux/slab.h>
  15 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  16 #include <linux/bio.h>
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19
  20 #include <asm/debug.h>
  21 #include <asm/idals.h>
  22 #include <asm/ebcdic.h>
  23 #include <asm/io.h>
  24 #include <asm/todclk.h>
  25 #include <asm/uaccess.h>
  26 #include <asm/cio.h>
  27 #include <asm/ccwdev.h>
  28
  29 #include "dasd_int.h"
  30 #include "dasd_eckd.h"
  31
  32 #ifdef PRINTK_HEADER
  33 #undef PRINTK_HEADER
  34 #endif                          /* PRINTK_HEADER */
  35 #define PRINTK_HEADER "dasd(eckd):"
  36
  37 #define ECKD_C0(i) (i->home_bytes)
  38 #define ECKD_F(i) (i->formula)
  39 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
  40                     (i->factors.f_0x02.f1))
  41 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
  42                     (i->factors.f_0x02.f2))
  43 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
  44                     (i->factors.f_0x02.f3))
  45 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
  46 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
  47 #define ECKD_F6(i) (i->factor6)
  48 #define ECKD_F7(i) (i->factor7)
  49 #define ECKD_F8(i) (i->factor8)
  50
  51 MODULE_LICENSE("GPL");
  52
  53 static struct dasd_discipline dasd_eckd_discipline;
  54
  55 /* The ccw bus type uses this table to find devices that it sends to
  56  * dasd_eckd_probe */
  57 static struct ccw_device_id dasd_eckd_ids[] = {
  58         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
  59         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
  60         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3390, 0), .driver_info = 0x3},
  61         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
  62         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
  63         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
  64         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
  65         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
  66         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
  67         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
  68         { /* end of list */ },
  69 };
  70
  71 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  72
  73 static struct ccw_driver dasd_eckd_driver; /* see below */
  74
  75 /* initial attempt at a probe function. this can be simplified once
  76  * the other detection code is gone */
  77 static int
  78 dasd_eckd_probe (struct ccw_device *cdev)
  79 {
  80         int ret;
  81
  82         /* set ECKD specific ccw-device options */
  83         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE);
  84         if (ret) {
  85                 printk(KERN_WARNING
  86                        "dasd_eckd_probe: could not set ccw-device options "
  87                        "for %s\n", cdev->dev.bus_id);
  88                 return ret;
  89         }
  90         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
  91         return ret;
  92 }
  93
  94 static int
  95 dasd_eckd_set_online(struct ccw_device *cdev)
  96 {
  97         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
  98 }
  99
 100 static struct ccw_driver dasd_eckd_driver = {
 101         .name        = "dasd-eckd",
 102         .owner       = THIS_MODULE,
 103         .ids         = dasd_eckd_ids,
 104         .probe       = dasd_eckd_probe,
 105         .remove      = dasd_generic_remove,
 106         .set_offline = dasd_generic_set_offline,
 107         .set_online  = dasd_eckd_set_online,
 108         .notify      = dasd_generic_notify,
 109 };
 110
 111 static const int sizes_trk0[] = { 28, 148, 84 };
 112 #define LABEL_SIZE 140
 113
 114 static inline unsigned int
 115 round_up_multiple(unsigned int no, unsigned int mult)
 116 {
 117         int rem = no % mult;
 118         return (rem ? no - rem + mult : no);
 119 }
 120
 121 static inline unsigned int
 122 ceil_quot(unsigned int d1, unsigned int d2)
 123 {
 124         return (d1 + (d2 - 1)) / d2;
 125 }
 126
 127 static unsigned int
 128 recs_per_track(struct dasd_eckd_characteristics * rdc,
 129                unsigned int kl, unsigned int dl)
 130 {
 131         int dn, kn;
 132
 133         switch (rdc->dev_type) {
 134         case 0x3380:
 135                 if (kl)
 136                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 137                                        ceil_quot(dl + 12, 32));
 138                 else
 139                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 140         case 0x3390:
 141                 dn = ceil_quot(dl + 6, 232) + 1;
 142                 if (kl) {
 143                         kn = ceil_quot(kl + 6, 232) + 1;
 144                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 145                                        9 + ceil_quot(dl + 6 * dn, 34));
 146                 } else
 147                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 148         case 0x9345:
 149                 dn = ceil_quot(dl + 6, 232) + 1;
 150                 if (kl) {
 151                         kn = ceil_quot(kl + 6, 232) + 1;
 152                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 153                                        ceil_quot(dl + 6 * dn, 34));
 154                 } else
 155                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 156         }
 157         return 0;
 158 }
 159
 160 static int
 161 check_XRC (struct ccw1         *de_ccw,
 162            struct DE_eckd_data *data,
 163            struct dasd_device  *device)
 164 {
 165         struct dasd_eckd_private *private;
 166         int rc;
 167
 168         private = (struct dasd_eckd_private *) device->private;
 169         if (!private->rdc_data.facilities.XRC_supported)
 170                 return 0;
 171
 172         /* switch on System Time Stamp - needed for XRC Support */
 173         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 174         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 175
 176         rc = get_sync_clock(&data->ep_sys_time);
 177         /* Ignore return code if sync clock is switched off. */
 178         if (rc == -ENOSYS || rc == -EACCES)
 179                 rc = 0;
 180
 181         de_ccw->count = sizeof(struct DE_eckd_data);
 182         de_ccw->flags |= CCW_FLAG_SLI;
 183         return rc;
 184 }
 185
 186 static int
 187 define_extent(struct ccw1 * ccw, struct DE_eckd_data * data, int trk,
 188               int totrk, int cmd, struct dasd_device * device)
 189 {
 190         struct dasd_eckd_private *private;
 191         struct ch_t geo, beg, end;
 192         int rc = 0;
 193
 194         private = (struct dasd_eckd_private *) device->private;
 195
 196         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 197         ccw->flags = 0;
 198         ccw->count = 16;
 199         ccw->cda = (__u32) __pa(data);
 200
 201         memset(data, 0, sizeof(struct DE_eckd_data));
 202         switch (cmd) {
 203         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 204         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 205         case DASD_ECKD_CCW_READ:
 206         case DASD_ECKD_CCW_READ_MT:
 207         case DASD_ECKD_CCW_READ_CKD:
 208         case DASD_ECKD_CCW_READ_CKD_MT:
 209         case DASD_ECKD_CCW_READ_KD:
 210         case DASD_ECKD_CCW_READ_KD_MT:
 211         case DASD_ECKD_CCW_READ_COUNT:
 212                 data->mask.perm = 0x1;
 213                 data->attributes.operation = private->attrib.operation;
 214                 break;
 215         case DASD_ECKD_CCW_WRITE:
 216         case DASD_ECKD_CCW_WRITE_MT:
 217         case DASD_ECKD_CCW_WRITE_KD:
 218         case DASD_ECKD_CCW_WRITE_KD_MT:
 219                 data->mask.perm = 0x02;
 220                 data->attributes.operation = private->attrib.operation;
 221                 rc = check_XRC (ccw, data, device);
 222                 break;
 223         case DASD_ECKD_CCW_WRITE_CKD:
 224         case DASD_ECKD_CCW_WRITE_CKD_MT:
 225                 data->attributes.operation = DASD_BYPASS_CACHE;
 226                 rc = check_XRC (ccw, data, device);
 227                 break;
 228         case DASD_ECKD_CCW_ERASE:
 229         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 230         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 231                 data->mask.perm = 0x3;
 232                 data->mask.auth = 0x1;
 233                 data->attributes.operation = DASD_BYPASS_CACHE;
 234                 rc = check_XRC (ccw, data, device);
 235                 break;
 236         default:
 237                 DEV_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", cmd);
 238                 break;
 239         }
 240
 241         data->attributes.mode = 0x3;    /* ECKD */
 242
 243         if ((private->rdc_data.cu_type == 0x2105 ||
 244              private->rdc_data.cu_type == 0x2107 ||
 245              private->rdc_data.cu_type == 0x1750)
 246             && !(private->uses_cdl && trk < 2))
 247                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 248
 249         geo.cyl = private->rdc_data.no_cyl;
 250         geo.head = private->rdc_data.trk_per_cyl;
 251         beg.cyl = trk / geo.head;
 252         beg.head = trk % geo.head;
 253         end.cyl = totrk / geo.head;
 254         end.head = totrk % geo.head;
 255
 256         /* check for sequential prestage - enhance cylinder range */
 257         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 258             data->attributes.operation == DASD_SEQ_ACCESS) {
 259
 260                 if (end.cyl + private->attrib.nr_cyl < geo.cyl)
 261                         end.cyl += private->attrib.nr_cyl;
 262                 else
 263                         end.cyl = (geo.cyl - 1);
 264         }
 265
 266         data->beg_ext.cyl = beg.cyl;
 267         data->beg_ext.head = beg.head;
 268         data->end_ext.cyl = end.cyl;
 269         data->end_ext.head = end.head;
 270         return rc;
 271 }
 272
 273 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
 274                                struct dasd_device  *device)
 275 {
 276         struct dasd_eckd_private *private;
 277         int rc;
 278
 279         private = (struct dasd_eckd_private *) device->private;
 280         if (!private->rdc_data.facilities.XRC_supported)
 281                 return 0;
 282
 283         /* switch on System Time Stamp - needed for XRC Support */
 284         pfxdata->define_extend.ga_extended |= 0x08; /* 'Time Stamp Valid'   */
 285         pfxdata->define_extend.ga_extended |= 0x02; /* 'Extended Parameter' */
 286         pfxdata->validity.time_stamp = 1;           /* 'Time Stamp Valid'   */
 287
 288         rc = get_sync_clock(&pfxdata->define_extend.ep_sys_time);
 289         /* Ignore return code if sync clock is switched off. */
 290         if (rc == -ENOSYS || rc == -EACCES)
 291                 rc = 0;
 292         return rc;
 293 }
 294
 295 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata, int trk,
 296                   int totrk, int cmd, struct dasd_device *basedev,
 297                   struct dasd_device *startdev)
 298 {
 299         struct dasd_eckd_private *basepriv, *startpriv;
 300         struct DE_eckd_data *data;
 301         struct ch_t geo, beg, end;
 302         int rc = 0;
 303
 304         basepriv = (struct dasd_eckd_private *) basedev->private;
 305         startpriv = (struct dasd_eckd_private *) startdev->private;
 306         data = &pfxdata->define_extend;
 307
 308         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 309         ccw->flags = 0;
 310         ccw->count = sizeof(*pfxdata);
 311         ccw->cda = (__u32) __pa(pfxdata);
 312
 313         memset(pfxdata, 0, sizeof(*pfxdata));
 314         /* prefix data */
 315         pfxdata->format = 0;
 316         pfxdata->base_address = basepriv->ned->unit_addr;
 317         pfxdata->base_lss = basepriv->ned->ID;
 318         pfxdata->validity.define_extend = 1;
 319
 320         /* private uid is kept up to date, conf_data may be outdated */
 321         if (startpriv->uid.type != UA_BASE_DEVICE) {
 322                 pfxdata->validity.verify_base = 1;
 323                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
 324                         pfxdata->validity.hyper_pav = 1;
 325         }
 326
 327         /* define extend data (mostly)*/
 328         switch (cmd) {
 329         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 330         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 331         case DASD_ECKD_CCW_READ:
 332         case DASD_ECKD_CCW_READ_MT:
 333         case DASD_ECKD_CCW_READ_CKD:
 334         case DASD_ECKD_CCW_READ_CKD_MT:
 335         case DASD_ECKD_CCW_READ_KD:
 336         case DASD_ECKD_CCW_READ_KD_MT:
 337         case DASD_ECKD_CCW_READ_COUNT:
 338                 data->mask.perm = 0x1;
 339                 data->attributes.operation = basepriv->attrib.operation;
 340                 break;
 341         case DASD_ECKD_CCW_WRITE:
 342         case DASD_ECKD_CCW_WRITE_MT:
 343         case DASD_ECKD_CCW_WRITE_KD:
 344         case DASD_ECKD_CCW_WRITE_KD_MT:
 345                 data->mask.perm = 0x02;
 346                 data->attributes.operation = basepriv->attrib.operation;
 347                 rc = check_XRC_on_prefix(pfxdata, basedev);
 348                 break;
 349         case DASD_ECKD_CCW_WRITE_CKD:
 350         case DASD_ECKD_CCW_WRITE_CKD_MT:
 351                 data->attributes.operation = DASD_BYPASS_CACHE;
 352                 rc = check_XRC_on_prefix(pfxdata, basedev);
 353                 break;
 354         case DASD_ECKD_CCW_ERASE:
 355         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 356         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 357                 data->mask.perm = 0x3;
 358                 data->mask.auth = 0x1;
 359                 data->attributes.operation = DASD_BYPASS_CACHE;
 360                 rc = check_XRC_on_prefix(pfxdata, basedev);
 361                 break;
 362         default:
 363                 DEV_MESSAGE(KERN_ERR, basedev, "unknown opcode 0x%x", cmd);
 364                 break;
 365         }
 366
 367         data->attributes.mode = 0x3;    /* ECKD */
 368
 369         if ((basepriv->rdc_data.cu_type == 0x2105 ||
 370              basepriv->rdc_data.cu_type == 0x2107 ||
 371              basepriv->rdc_data.cu_type == 0x1750)
 372             && !(basepriv->uses_cdl && trk < 2))
 373                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 374
 375         geo.cyl = basepriv->rdc_data.no_cyl;
 376         geo.head = basepriv->rdc_data.trk_per_cyl;
 377         beg.cyl = trk / geo.head;
 378         beg.head = trk % geo.head;
 379         end.cyl = totrk / geo.head;
 380         end.head = totrk % geo.head;
 381
 382         /* check for sequential prestage - enhance cylinder range */
 383         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 384             data->attributes.operation == DASD_SEQ_ACCESS) {
 385
 386                 if (end.cyl + basepriv->attrib.nr_cyl < geo.cyl)
 387                         end.cyl += basepriv->attrib.nr_cyl;
 388                 else
 389                         end.cyl = (geo.cyl - 1);
 390         }
 391
 392         data->beg_ext.cyl = beg.cyl;
 393         data->beg_ext.head = beg.head;
 394         data->end_ext.cyl = end.cyl;
 395         data->end_ext.head = end.head;
 396         return rc;
 397 }
 398
 399 static void
 400 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, int trk,
 401               int rec_on_trk, int no_rec, int cmd,
 402               struct dasd_device * device, int reclen)
 403 {
 404         struct dasd_eckd_private *private;
 405         int sector;
 406         int dn, d;
 407
 408         private = (struct dasd_eckd_private *) device->private;
 409
 410         DBF_DEV_EVENT(DBF_INFO, device,
 411                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 412                   trk, rec_on_trk, no_rec, cmd, reclen);
 413
 414         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 415         ccw->flags = 0;
 416         ccw->count = 16;
 417         ccw->cda = (__u32) __pa(data);
 418
 419         memset(data, 0, sizeof(struct LO_eckd_data));
 420         sector = 0;
 421         if (rec_on_trk) {
 422                 switch (private->rdc_data.dev_type) {
 423                 case 0x3390:
 424                         dn = ceil_quot(reclen + 6, 232);
 425                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 426                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 427                         break;
 428                 case 0x3380:
 429                         d = 7 + ceil_quot(reclen + 12, 32);
 430                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 431                         break;
 432                 }
 433         }
 434         data->sector = sector;
 435         data->count = no_rec;
 436         switch (cmd) {
 437         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 438                 data->operation.orientation = 0x3;
 439                 data->operation.operation = 0x03;
 440                 break;
 441         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 442                 data->operation.orientation = 0x3;
 443                 data->operation.operation = 0x16;
 444                 break;
 445         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 446                 data->operation.orientation = 0x1;
 447                 data->operation.operation = 0x03;
 448                 data->count++;
 449                 break;
 450         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 451                 data->operation.orientation = 0x3;
 452                 data->operation.operation = 0x16;
 453                 data->count++;
 454                 break;
 455         case DASD_ECKD_CCW_WRITE:
 456         case DASD_ECKD_CCW_WRITE_MT:
 457         case DASD_ECKD_CCW_WRITE_KD:
 458         case DASD_ECKD_CCW_WRITE_KD_MT:
 459                 data->auxiliary.last_bytes_used = 0x1;
 460                 data->length = reclen;
 461                 data->operation.operation = 0x01;
 462                 break;
 463         case DASD_ECKD_CCW_WRITE_CKD:
 464         case DASD_ECKD_CCW_WRITE_CKD_MT:
 465                 data->auxiliary.last_bytes_used = 0x1;
 466                 data->length = reclen;
 467                 data->operation.operation = 0x03;
 468                 break;
 469         case DASD_ECKD_CCW_READ:
 470         case DASD_ECKD_CCW_READ_MT:
 471         case DASD_ECKD_CCW_READ_KD:
 472         case DASD_ECKD_CCW_READ_KD_MT:
 473                 data->auxiliary.last_bytes_used = 0x1;
 474                 data->length = reclen;
 475                 data->operation.operation = 0x06;
 476                 break;
 477         case DASD_ECKD_CCW_READ_CKD:
 478         case DASD_ECKD_CCW_READ_CKD_MT:
 479                 data->auxiliary.last_bytes_used = 0x1;
 480                 data->length = reclen;
 481                 data->operation.operation = 0x16;
 482                 break;
 483         case DASD_ECKD_CCW_READ_COUNT:
 484                 data->operation.operation = 0x06;
 485                 break;
 486         case DASD_ECKD_CCW_ERASE:
 487                 data->length = reclen;
 488                 data->auxiliary.last_bytes_used = 0x1;
 489                 data->operation.operation = 0x0b;
 490                 break;
 491         default:
 492                 DEV_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", cmd);
 493         }
 494         data->seek_addr.cyl = data->search_arg.cyl =
 495                 trk / private->rdc_data.trk_per_cyl;
 496         data->seek_addr.head = data->search_arg.head =
 497                 trk % private->rdc_data.trk_per_cyl;
 498         data->search_arg.record = rec_on_trk;
 499 }
 500
 501 /*
 502  * Returns 1 if the block is one of the special blocks that needs
 503  * to get read/written with the KD variant of the command.
 504  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 505  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 506  * Luckily the KD variants differ only by one bit (0x08) from the
 507  * normal variant. So don't wonder about code like:
 508  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 509  *         ccw->cmd_code |= 0x8;
 510  */
 511 static inline int
 512 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 513 {
 514         if (recid < 3)
 515                 return 1;
 516         if (recid < blk_per_trk)
 517                 return 0;
 518         if (recid < 2 * blk_per_trk)
 519                 return 1;
 520         return 0;
 521 }
 522
 523 /*
 524  * Returns the record size for the special blocks of the cdl format.
 525  * Only returns something useful if dasd_eckd_cdl_special is true
 526  * for the recid.
 527  */
 528 static inline int
 529 dasd_eckd_cdl_reclen(int recid)
 530 {
 531         if (recid < 3)
 532                 return sizes_trk0[recid];
 533         return LABEL_SIZE;
 534 }
 535
 536 /*
 537  * Generate device unique id that specifies the physical device.
 538  */
 539 static int dasd_eckd_generate_uid(struct dasd_device *device,
 540                                   struct dasd_uid *uid)
 541 {
 542         struct dasd_eckd_private *private;
 543         int count;
 544
 545         private = (struct dasd_eckd_private *) device->private;
 546         if (!private)
 547                 return -ENODEV;
 548         if (!private->ned || !private->gneq)
 549                 return -ENODEV;
 550
 551         memset(uid, 0, sizeof(struct dasd_uid));
 552         memcpy(uid->vendor, private->ned->HDA_manufacturer,
 553                sizeof(uid->vendor) - 1);
 554         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 555         memcpy(uid->serial, private->ned->HDA_location,
 556                sizeof(uid->serial) - 1);
 557         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 558         uid->ssid = private->gneq->subsystemID;
 559         uid->real_unit_addr = private->ned->unit_addr;;
 560         if (private->sneq) {
 561                 uid->type = private->sneq->sua_flags;
 562                 if (uid->type == UA_BASE_PAV_ALIAS)
 563                         uid->base_unit_addr = private->sneq->base_unit_addr;
 564         } else {
 565                 uid->type = UA_BASE_DEVICE;
 566         }
 567         if (private->vdsneq) {
 568                 for (count = 0; count < 16; count++) {
 569                         sprintf(uid->vduit+2*count, "%02x",
 570                                 private->vdsneq->uit[count]);
 571                 }
 572         }
 573         return 0;
 574 }
 575
 576 static struct dasd_ccw_req *dasd_eckd_build_rcd_lpm(struct dasd_device *device,
 577                                                     void *rcd_buffer,
 578                                                     struct ciw *ciw, __u8 lpm)
 579 {
 580         struct dasd_ccw_req *cqr;
 581         struct ccw1 *ccw;
 582
 583         cqr = dasd_smalloc_request("ECKD", 1 /* RCD */, ciw->count, device);
 584
 585         if (IS_ERR(cqr)) {
 586                 DEV_MESSAGE(KERN_WARNING, device, "%s",
 587                             "Could not allocate RCD request");
 588                 return cqr;
 589         }
 590
 591         ccw = cqr->cpaddr;
 592         ccw->cmd_code = ciw->cmd;
 593         ccw->cda = (__u32)(addr_t)rcd_buffer;
 594         ccw->count = ciw->count;
 595
 596         cqr->startdev = device;
 597         cqr->memdev = device;
 598         cqr->block = NULL;
 599         cqr->expires = 10*HZ;
 600         cqr->lpm = lpm;
 601         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 602         cqr->retries = 2;
 603         cqr->buildclk = get_clock();
 604         cqr->status = DASD_CQR_FILLED;
 605         return cqr;
 606 }
 607
 608 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 609                                    void **rcd_buffer,
 610                                    int *rcd_buffer_size, __u8 lpm)
 611 {
 612         struct ciw *ciw;
 613         char *rcd_buf = NULL;
 614         int ret;
 615         struct dasd_ccw_req *cqr;
 616
 617         /*
 618          * scan for RCD command in extended SenseID data
 619          */
 620         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 621         if (!ciw || ciw->cmd == 0) {
 622                 ret = -EOPNOTSUPP;
 623                 goto out_error;
 624         }
 625         rcd_buf = kzalloc(ciw->count, GFP_KERNEL | GFP_DMA);
 626         if (!rcd_buf) {
 627                 ret = -ENOMEM;
 628                 goto out_error;
 629         }
 630
 631         /*
 632          * buffer has to start with EBCDIC "V1.0" to show
 633          * support for virtual device SNEQ
 634          */
 635         rcd_buf[0] = 0xE5;
 636         rcd_buf[1] = 0xF1;
 637         rcd_buf[2] = 0x4B;
 638         rcd_buf[3] = 0xF0;
 639         cqr = dasd_eckd_build_rcd_lpm(device, rcd_buf, ciw, lpm);
 640         if (IS_ERR(cqr)) {
 641                 ret =  PTR_ERR(cqr);
 642                 goto out_error;
 643         }
 644         ret = dasd_sleep_on(cqr);
 645         /*
 646          * on success we update the user input parms
 647          */
 648         dasd_sfree_request(cqr, cqr->memdev);
 649         if (ret)
 650                 goto out_error;
 651
 652         *rcd_buffer_size = ciw->count;
 653         *rcd_buffer = rcd_buf;
 654         return 0;
 655 out_error:
 656         kfree(rcd_buf);
 657         *rcd_buffer = NULL;
 658         *rcd_buffer_size = 0;
 659         return ret;
 660 }
 661
 662 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
 663 {
 664
 665         struct dasd_sneq *sneq;
 666         int i, count;
 667
 668         private->ned = NULL;
 669         private->sneq = NULL;
 670         private->vdsneq = NULL;
 671         private->gneq = NULL;
 672         count = private->conf_len / sizeof(struct dasd_sneq);
 673         sneq = (struct dasd_sneq *)private->conf_data;
 674         for (i = 0; i < count; ++i) {
 675                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 676                         private->sneq = sneq;
 677                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 678                         private->vdsneq = (struct vd_sneq *)sneq;
 679                 else if (sneq->flags.identifier == 2)
 680                         private->gneq = (struct dasd_gneq *)sneq;
 681                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 682                         private->ned = (struct dasd_ned *)sneq;
 683                 sneq++;
 684         }
 685         if (!private->ned || !private->gneq) {
 686                 private->ned = NULL;
 687                 private->sneq = NULL;
 688                 private->vdsneq = NULL;
 689                 private->gneq = NULL;
 690                 return -EINVAL;
 691         }
 692         return 0;
 693
 694 };
 695
 696 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
 697 {
 698         struct dasd_gneq *gneq;
 699         int i, count, found;
 700
 701         count = conf_len / sizeof(*gneq);
 702         gneq = (struct dasd_gneq *)conf_data;
 703         found = 0;
 704         for (i = 0; i < count; ++i) {
 705                 if (gneq->flags.identifier == 2) {
 706                         found = 1;
 707                         break;
 708                 }
 709                 gneq++;
 710         }
 711         if (found)
 712                 return ((char *)gneq)[18] & 0x07;
 713         else
 714                 return 0;
 715 }
 716
 717 static int dasd_eckd_read_conf(struct dasd_device *device)
 718 {
 719         void *conf_data;
 720         int conf_len, conf_data_saved;
 721         int rc;
 722         __u8 lpm;
 723         struct dasd_eckd_private *private;
 724         struct dasd_eckd_path *path_data;
 725
 726         private = (struct dasd_eckd_private *) device->private;
 727         path_data = (struct dasd_eckd_path *) &private->path_data;
 728         path_data->opm = ccw_device_get_path_mask(device->cdev);
 729         lpm = 0x80;
 730         conf_data_saved = 0;
 731         /* get configuration data per operational path */
 732         for (lpm = 0x80; lpm; lpm>>= 1) {
 733                 if (lpm & path_data->opm){
 734                         rc = dasd_eckd_read_conf_lpm(device, &conf_data,
 735                                                      &conf_len, lpm);
 736                         if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
 737                                 MESSAGE(KERN_WARNING,
 738                                         "Read configuration data returned "
 739                                         "error %d", rc);
 740                                 return rc;
 741                         }
 742                         if (conf_data == NULL) {
 743                                 MESSAGE(KERN_WARNING, "%s", "No configuration "
 744                                         "data retrieved");
 745                                 continue;       /* no error */
 746                         }
 747                         /* save first valid configuration data */
 748                         if (!conf_data_saved) {
 749                                 kfree(private->conf_data);
 750                                 private->conf_data = conf_data;
 751                                 private->conf_len = conf_len;
 752                                 if (dasd_eckd_identify_conf_parts(private)) {
 753                                         private->conf_data = NULL;
 754                                         private->conf_len = 0;
 755                                         kfree(conf_data);
 756                                         continue;
 757                                 }
 758                                 conf_data_saved++;
 759                         }
 760                         switch (dasd_eckd_path_access(conf_data, conf_len)) {
 761                         case 0x02:
 762                                 path_data->npm |= lpm;
 763                                 break;
 764                         case 0x03:
 765                                 path_data->ppm |= lpm;
 766                                 break;
 767                         }
 768                         if (conf_data != private->conf_data)
 769                                 kfree(conf_data);
 770                 }
 771         }
 772         return 0;
 773 }
 774
 775 static int dasd_eckd_read_features(struct dasd_device *device)
 776 {
 777         struct dasd_psf_prssd_data *prssdp;
 778         struct dasd_rssd_features *features;
 779         struct dasd_ccw_req *cqr;
 780         struct ccw1 *ccw;
 781         int rc;
 782         struct dasd_eckd_private *private;
 783
 784         private = (struct dasd_eckd_private *) device->private;
 785         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
 786                                    1 /* PSF */  + 1 /* RSSD */ ,
 787                                    (sizeof(struct dasd_psf_prssd_data) +
 788                                     sizeof(struct dasd_rssd_features)),
 789                                    device);
 790         if (IS_ERR(cqr)) {
 791                 DEV_MESSAGE(KERN_WARNING, device, "%s",
 792                             "Could not allocate initialization request");
 793                 return PTR_ERR(cqr);
 794         }
 795         cqr->startdev = device;
 796         cqr->memdev = device;
 797         cqr->block = NULL;
 798         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 799         cqr->retries = 5;
 800         cqr->expires = 10 * HZ;
 801
 802         /* Prepare for Read Subsystem Data */
 803         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
 804         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
 805         prssdp->order = PSF_ORDER_PRSSD;
 806         prssdp->suborder = 0x41;        /* Read Feature Codes */
 807         /* all other bytes of prssdp must be zero */
 808
 809         ccw = cqr->cpaddr;
 810         ccw->cmd_code = DASD_ECKD_CCW_PSF;
 811         ccw->count = sizeof(struct dasd_psf_prssd_data);
 812         ccw->flags |= CCW_FLAG_CC;
 813         ccw->cda = (__u32)(addr_t) prssdp;
 814
 815         /* Read Subsystem Data - feature codes */
 816         features = (struct dasd_rssd_features *) (prssdp + 1);
 817         memset(features, 0, sizeof(struct dasd_rssd_features));
 818
 819         ccw++;
 820         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
 821         ccw->count = sizeof(struct dasd_rssd_features);
 822         ccw->cda = (__u32)(addr_t) features;
 823
 824         cqr->buildclk = get_clock();
 825         cqr->status = DASD_CQR_FILLED;
 826         rc = dasd_sleep_on(cqr);
 827         if (rc == 0) {
 828                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
 829                 features = (struct dasd_rssd_features *) (prssdp + 1);
 830                 memcpy(&private->features, features,
 831                        sizeof(struct dasd_rssd_features));
 832         }
 833         dasd_sfree_request(cqr, cqr->memdev);
 834         return rc;
 835 }
 836
 837
 838 /*
 839  * Build CP for Perform Subsystem Function - SSC.
 840  */
 841 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device)
 842 {
 843         struct dasd_ccw_req *cqr;
 844         struct dasd_psf_ssc_data *psf_ssc_data;
 845         struct ccw1 *ccw;
 846
 847         cqr = dasd_smalloc_request("ECKD", 1 /* PSF */ ,
 848                                   sizeof(struct dasd_psf_ssc_data),
 849                                   device);
 850
 851         if (IS_ERR(cqr)) {
 852                 DEV_MESSAGE(KERN_WARNING, device, "%s",
 853                            "Could not allocate PSF-SSC request");
 854                 return cqr;
 855         }
 856         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
 857         psf_ssc_data->order = PSF_ORDER_SSC;
 858         psf_ssc_data->suborder = 0x88;
 859         psf_ssc_data->reserved[0] = 0x88;
 860
 861         ccw = cqr->cpaddr;
 862         ccw->cmd_code = DASD_ECKD_CCW_PSF;
 863         ccw->cda = (__u32)(addr_t)psf_ssc_data;
 864         ccw->count = 66;
 865
 866         cqr->startdev = device;
 867         cqr->memdev = device;
 868         cqr->block = NULL;
 869         cqr->expires = 10*HZ;
 870         cqr->buildclk = get_clock();
 871         cqr->status = DASD_CQR_FILLED;
 872         return cqr;
 873 }
 874
 875 /*
 876  * Perform Subsystem Function.
 877  * It is necessary to trigger CIO for channel revalidation since this
 878  * call might change behaviour of DASD devices.
 879  */
 880 static int
 881 dasd_eckd_psf_ssc(struct dasd_device *device)
 882 {
 883         struct dasd_ccw_req *cqr;
 884         int rc;
 885
 886         cqr = dasd_eckd_build_psf_ssc(device);
 887         if (IS_ERR(cqr))
 888                 return PTR_ERR(cqr);
 889
 890         rc = dasd_sleep_on(cqr);
 891         if (!rc)
 892                 /* trigger CIO to reprobe devices */
 893                 css_schedule_reprobe();
 894         dasd_sfree_request(cqr, cqr->memdev);
 895         return rc;
 896 }
 897
 898 /*
 899  * Valide storage server of current device.
 900  */
 901 static int dasd_eckd_validate_server(struct dasd_device *device)
 902 {
 903         int rc;
 904         struct dasd_eckd_private *private;
 905
 906         /* Currently PAV is the only reason to 'validate' server on LPAR */
 907         if (dasd_nopav || MACHINE_IS_VM)
 908                 return 0;
 909
 910         rc = dasd_eckd_psf_ssc(device);
 911         /* may be requested feature is not available on server,
 912          * therefore just report error and go ahead */
 913         private = (struct dasd_eckd_private *) device->private;
 914         DEV_MESSAGE(KERN_INFO, device,
 915                     "PSF-SSC on storage subsystem %s.%s.%04x returned rc=%d",
 916                     private->uid.vendor, private->uid.serial,
 917                     private->uid.ssid, rc);
 918         /* RE-Read Configuration Data */
 919         return dasd_eckd_read_conf(device);
 920 }
 921
 922 /*
 923  * Check device characteristics.
 924  * If the device is accessible using ECKD discipline, the device is enabled.
 925  */
 926 static int
 927 dasd_eckd_check_characteristics(struct dasd_device *device)
 928 {
 929         struct dasd_eckd_private *private;
 930         struct dasd_block *block;
 931         void *rdc_data;
 932         int is_known, rc;
 933
 934         private = (struct dasd_eckd_private *) device->private;
 935         if (private == NULL) {
 936                 private = kzalloc(sizeof(struct dasd_eckd_private),
 937                                   GFP_KERNEL | GFP_DMA);
 938                 if (private == NULL) {
 939                         DEV_MESSAGE(KERN_WARNING, device, "%s",
 940                                     "memory allocation failed for private "
 941                                     "data");
 942                         return -ENOMEM;
 943                 }
 944                 device->private = (void *) private;
 945         }
 946         /* Invalidate status of initial analysis. */
 947         private->init_cqr_status = -1;
 948         /* Set default cache operations. */
 949         private->attrib.operation = DASD_NORMAL_CACHE;
 950         private->attrib.nr_cyl = 0;
 951
 952         /* Read Configuration Data */
 953         rc = dasd_eckd_read_conf(device);
 954         if (rc)
 955                 goto out_err1;
 956
 957         /* Generate device unique id and register in devmap */
 958         rc = dasd_eckd_generate_uid(device, &private->uid);
 959         if (rc)
 960                 goto out_err1;
 961         dasd_set_uid(device->cdev, &private->uid);
 962
 963         if (private->uid.type == UA_BASE_DEVICE) {
 964                 block = dasd_alloc_block();
 965                 if (IS_ERR(block)) {
 966                         DEV_MESSAGE(KERN_WARNING, device, "%s",
 967                                     "could not allocate dasd block structure");
 968                         rc = PTR_ERR(block);
 969                         goto out_err1;
 970                 }
 971                 device->block = block;
 972                 block->base = device;
 973         }
 974
 975         /* register lcu with alias handling, enable PAV if this is a new lcu */
 976         is_known = dasd_alias_make_device_known_to_lcu(device);
 977         if (is_known < 0) {
 978                 rc = is_known;
 979                 goto out_err2;
 980         }
 981         if (!is_known) {
 982                 /* new lcu found */
 983                 rc = dasd_eckd_validate_server(device); /* will switch pav on */
 984                 if (rc)
 985                         goto out_err3;
 986         }
 987
 988         /* Read Feature Codes */
 989         rc = dasd_eckd_read_features(device);
 990         if (rc)
 991                 goto out_err3;
 992
 993         /* Read Device Characteristics */
 994         rdc_data = (void *) &(private->rdc_data);
 995         memset(rdc_data, 0, sizeof(rdc_data));
 996         rc = dasd_generic_read_dev_chars(device, "ECKD", &rdc_data, 64);
 997         if (rc) {
 998                 DEV_MESSAGE(KERN_WARNING, device,
 999                             "Read device characteristics returned "
1000                             "rc=%d", rc);
1001                 goto out_err3;
1002         }
1003         DEV_MESSAGE(KERN_INFO, device,
1004                     "%04X/%02X(CU:%04X/%02X) Cyl:%d Head:%d Sec:%d",
1005                     private->rdc_data.dev_type,
1006                     private->rdc_data.dev_model,
1007                     private->rdc_data.cu_type,
1008                     private->rdc_data.cu_model.model,
1009                     private->rdc_data.no_cyl,
1010                     private->rdc_data.trk_per_cyl,
1011                     private->rdc_data.sec_per_trk);
1012         return 0;
1013
1014 out_err3:
1015         dasd_alias_disconnect_device_from_lcu(device);
1016 out_err2:
1017         dasd_free_block(device->block);
1018         device->block = NULL;
1019 out_err1:
1020         kfree(private->conf_data);
1021         kfree(device->private);
1022         device->private = NULL;
1023         return rc;
1024 }
1025
1026 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1027 {
1028         struct dasd_eckd_private *private;
1029
1030         private = (struct dasd_eckd_private *) device->private;
1031         dasd_alias_disconnect_device_from_lcu(device);
1032         private->ned = NULL;
1033         private->sneq = NULL;
1034         private->vdsneq = NULL;
1035         private->gneq = NULL;
1036         private->conf_len = 0;
1037         kfree(private->conf_data);
1038         private->conf_data = NULL;
1039 }
1040
1041 static struct dasd_ccw_req *
1042 dasd_eckd_analysis_ccw(struct dasd_device *device)
1043 {
1044         struct dasd_eckd_private *private;
1045         struct eckd_count *count_data;
1046         struct LO_eckd_data *LO_data;
1047         struct dasd_ccw_req *cqr;
1048         struct ccw1 *ccw;
1049         int cplength, datasize;
1050         int i;
1051
1052         private = (struct dasd_eckd_private *) device->private;
1053
1054         cplength = 8;
1055         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1056         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1057                                    cplength, datasize, device);
1058         if (IS_ERR(cqr))
1059                 return cqr;
1060         ccw = cqr->cpaddr;
1061         /* Define extent for the first 3 tracks. */
1062         define_extent(ccw++, cqr->data, 0, 2,
1063                       DASD_ECKD_CCW_READ_COUNT, device);
1064         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1065         /* Locate record for the first 4 records on track 0. */
1066         ccw[-1].flags |= CCW_FLAG_CC;
1067         locate_record(ccw++, LO_data++, 0, 0, 4,
1068                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1069
1070         count_data = private->count_area;
1071         for (i = 0; i < 4; i++) {
1072                 ccw[-1].flags |= CCW_FLAG_CC;
1073                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1074                 ccw->flags = 0;
1075                 ccw->count = 8;
1076                 ccw->cda = (__u32)(addr_t) count_data;
1077                 ccw++;
1078                 count_data++;
1079         }
1080
1081         /* Locate record for the first record on track 2. */
1082         ccw[-1].flags |= CCW_FLAG_CC;
1083         locate_record(ccw++, LO_data++, 2, 0, 1,
1084                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1085         /* Read count ccw. */
1086         ccw[-1].flags |= CCW_FLAG_CC;
1087         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1088         ccw->flags = 0;
1089         ccw->count = 8;
1090         ccw->cda = (__u32)(addr_t) count_data;
1091
1092         cqr->block = NULL;
1093         cqr->startdev = device;
1094         cqr->memdev = device;
1095         cqr->retries = 0;
1096         cqr->buildclk = get_clock();
1097         cqr->status = DASD_CQR_FILLED;
1098         return cqr;
1099 }
1100
1101 /*
1102  * This is the callback function for the init_analysis cqr. It saves
1103  * the status of the initial analysis ccw before it frees it and kicks
1104  * the device to continue the startup sequence. This will call
1105  * dasd_eckd_do_analysis again (if the devices has not been marked
1106  * for deletion in the meantime).
1107  */
1108 static void
1109 dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, void *data)
1110 {
1111         struct dasd_eckd_private *private;
1112         struct dasd_device *device;
1113
1114         device = init_cqr->startdev;
1115         private = (struct dasd_eckd_private *) device->private;
1116         private->init_cqr_status = init_cqr->status;
1117         dasd_sfree_request(init_cqr, device);
1118         dasd_kick_device(device);
1119 }
1120
1121 static int
1122 dasd_eckd_start_analysis(struct dasd_block *block)
1123 {
1124         struct dasd_eckd_private *private;
1125         struct dasd_ccw_req *init_cqr;
1126
1127         private = (struct dasd_eckd_private *) block->base->private;
1128         init_cqr = dasd_eckd_analysis_ccw(block->base);
1129         if (IS_ERR(init_cqr))
1130                 return PTR_ERR(init_cqr);
1131         init_cqr->callback = dasd_eckd_analysis_callback;
1132         init_cqr->callback_data = NULL;
1133         init_cqr->expires = 5*HZ;
1134         dasd_add_request_head(init_cqr);
1135         return -EAGAIN;
1136 }
1137
1138 static int
1139 dasd_eckd_end_analysis(struct dasd_block *block)
1140 {
1141         struct dasd_device *device;
1142         struct dasd_eckd_private *private;
1143         struct eckd_count *count_area;
1144         unsigned int sb, blk_per_trk;
1145         int status, i;
1146
1147         device = block->base;
1148         private = (struct dasd_eckd_private *) device->private;
1149         status = private->init_cqr_status;
1150         private->init_cqr_status = -1;
1151         if (status != DASD_CQR_DONE) {
1152                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1153                             "volume analysis returned unformatted disk");
1154                 return -EMEDIUMTYPE;
1155         }
1156
1157         private->uses_cdl = 1;
1158         /* Calculate number of blocks/records per track. */
1159         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1160         /* Check Track 0 for Compatible Disk Layout */
1161         count_area = NULL;
1162         for (i = 0; i < 3; i++) {
1163                 if (private->count_area[i].kl != 4 ||
1164                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
1165                         private->uses_cdl = 0;
1166                         break;
1167                 }
1168         }
1169         if (i == 3)
1170                 count_area = &private->count_area[4];
1171
1172         if (private->uses_cdl == 0) {
1173                 for (i = 0; i < 5; i++) {
1174                         if ((private->count_area[i].kl != 0) ||
1175                             (private->count_area[i].dl !=
1176                              private->count_area[0].dl))
1177                                 break;
1178                 }
1179                 if (i == 5)
1180                         count_area = &private->count_area[0];
1181         } else {
1182                 if (private->count_area[3].record == 1)
1183                         DEV_MESSAGE(KERN_WARNING, device, "%s",
1184                                     "Trk 0: no records after VTOC!");
1185         }
1186         if (count_area != NULL && count_area->kl == 0) {
1187                 /* we found notthing violating our disk layout */
1188                 if (dasd_check_blocksize(count_area->dl) == 0)
1189                         block->bp_block = count_area->dl;
1190         }
1191         if (block->bp_block == 0) {
1192                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1193                             "Volume has incompatible disk layout");
1194                 return -EMEDIUMTYPE;
1195         }
1196         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1197         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1198                 block->s2b_shift++;
1199
1200         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1201         block->blocks = (private->rdc_data.no_cyl *
1202                           private->rdc_data.trk_per_cyl *
1203                           blk_per_trk);
1204
1205         DEV_MESSAGE(KERN_INFO, device,
1206                     "(%dkB blks): %dkB at %dkB/trk %s",
1207                     (block->bp_block >> 10),
1208                     ((private->rdc_data.no_cyl *
1209                       private->rdc_data.trk_per_cyl *
1210                       blk_per_trk * (block->bp_block >> 9)) >> 1),
1211                     ((blk_per_trk * block->bp_block) >> 10),
1212                     private->uses_cdl ?
1213                     "compatible disk layout" : "linux disk layout");
1214
1215         return 0;
1216 }
1217
1218 static int dasd_eckd_do_analysis(struct dasd_block *block)
1219 {
1220         struct dasd_eckd_private *private;
1221
1222         private = (struct dasd_eckd_private *) block->base->private;
1223         if (private->init_cqr_status < 0)
1224                 return dasd_eckd_start_analysis(block);
1225         else
1226                 return dasd_eckd_end_analysis(block);
1227 }
1228
1229 static int dasd_eckd_ready_to_online(struct dasd_device *device)
1230 {
1231         return dasd_alias_add_device(device);
1232 };
1233
1234 static int dasd_eckd_online_to_ready(struct dasd_device *device)
1235 {
1236         return dasd_alias_remove_device(device);
1237 };
1238
1239 static int
1240 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
1241 {
1242         struct dasd_eckd_private *private;
1243
1244         private = (struct dasd_eckd_private *) block->base->private;
1245         if (dasd_check_blocksize(block->bp_block) == 0) {
1246                 geo->sectors = recs_per_track(&private->rdc_data,
1247                                               0, block->bp_block);
1248         }
1249         geo->cylinders = private->rdc_data.no_cyl;
1250         geo->heads = private->rdc_data.trk_per_cyl;
1251         return 0;
1252 }
1253
1254 static struct dasd_ccw_req *
1255 dasd_eckd_format_device(struct dasd_device * device,
1256                         struct format_data_t * fdata)
1257 {
1258         struct dasd_eckd_private *private;
1259         struct dasd_ccw_req *fcp;
1260         struct eckd_count *ect;
1261         struct ccw1 *ccw;
1262         void *data;
1263         int rpt, cyl, head;
1264         int cplength, datasize;
1265         int i;
1266
1267         private = (struct dasd_eckd_private *) device->private;
1268         rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
1269         cyl = fdata->start_unit / private->rdc_data.trk_per_cyl;
1270         head = fdata->start_unit % private->rdc_data.trk_per_cyl;
1271
1272         /* Sanity checks. */
1273         if (fdata->start_unit >=
1274             (private->rdc_data.no_cyl * private->rdc_data.trk_per_cyl)) {
1275                 DEV_MESSAGE(KERN_INFO, device, "Track no %d too big!",
1276                             fdata->start_unit);
1277                 return ERR_PTR(-EINVAL);
1278         }
1279         if (fdata->start_unit > fdata->stop_unit) {
1280                 DEV_MESSAGE(KERN_INFO, device, "Track %d reached! ending.",
1281                             fdata->start_unit);
1282                 return ERR_PTR(-EINVAL);
1283         }
1284         if (dasd_check_blocksize(fdata->blksize) != 0) {
1285                 DEV_MESSAGE(KERN_WARNING, device,
1286                             "Invalid blocksize %d...terminating!",
1287                             fdata->blksize);
1288                 return ERR_PTR(-EINVAL);
1289         }
1290
1291         /*
1292          * fdata->intensity is a bit string that tells us what to do:
1293          *   Bit 0: write record zero
1294          *   Bit 1: write home address, currently not supported
1295          *   Bit 2: invalidate tracks
1296          *   Bit 3: use OS/390 compatible disk layout (cdl)
1297          * Only some bit combinations do make sense.
1298          */
1299         switch (fdata->intensity) {
1300         case 0x00:      /* Normal format */
1301         case 0x08:      /* Normal format, use cdl. */
1302                 cplength = 2 + rpt;
1303                 datasize = sizeof(struct DE_eckd_data) +
1304                         sizeof(struct LO_eckd_data) +
1305                         rpt * sizeof(struct eckd_count);
1306                 break;
1307         case 0x01:      /* Write record zero and format track. */
1308         case 0x09:      /* Write record zero and format track, use cdl. */
1309                 cplength = 3 + rpt;
1310                 datasize = sizeof(struct DE_eckd_data) +
1311                         sizeof(struct LO_eckd_data) +
1312                         sizeof(struct eckd_count) +
1313                         rpt * sizeof(struct eckd_count);
1314                 break;
1315         case 0x04:      /* Invalidate track. */
1316         case 0x0c:      /* Invalidate track, use cdl. */
1317                 cplength = 3;
1318                 datasize = sizeof(struct DE_eckd_data) +
1319                         sizeof(struct LO_eckd_data) +
1320                         sizeof(struct eckd_count);
1321                 break;
1322         default:
1323                 DEV_MESSAGE(KERN_WARNING, device, "Invalid flags 0x%x.",
1324                             fdata->intensity);
1325                 return ERR_PTR(-EINVAL);
1326         }
1327         /* Allocate the format ccw request. */
1328         fcp = dasd_smalloc_request(dasd_eckd_discipline.name,
1329                                    cplength, datasize, device);
1330         if (IS_ERR(fcp))
1331                 return fcp;
1332
1333         data = fcp->data;
1334         ccw = fcp->cpaddr;
1335
1336         switch (fdata->intensity & ~0x08) {
1337         case 0x00: /* Normal format. */
1338                 define_extent(ccw++, (struct DE_eckd_data *) data,
1339                               fdata->start_unit, fdata->start_unit,
1340                               DASD_ECKD_CCW_WRITE_CKD, device);
1341                 data += sizeof(struct DE_eckd_data);
1342                 ccw[-1].flags |= CCW_FLAG_CC;
1343                 locate_record(ccw++, (struct LO_eckd_data *) data,
1344                               fdata->start_unit, 0, rpt,
1345                               DASD_ECKD_CCW_WRITE_CKD, device,
1346                               fdata->blksize);
1347                 data += sizeof(struct LO_eckd_data);
1348                 break;
1349         case 0x01: /* Write record zero + format track. */
1350                 define_extent(ccw++, (struct DE_eckd_data *) data,
1351                               fdata->start_unit, fdata->start_unit,
1352                               DASD_ECKD_CCW_WRITE_RECORD_ZERO,
1353                               device);
1354                 data += sizeof(struct DE_eckd_data);
1355                 ccw[-1].flags |= CCW_FLAG_CC;
1356                 locate_record(ccw++, (struct LO_eckd_data *) data,
1357                               fdata->start_unit, 0, rpt + 1,
1358                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
1359                               device->block->bp_block);
1360                 data += sizeof(struct LO_eckd_data);
1361                 break;
1362         case 0x04: /* Invalidate track. */
1363                 define_extent(ccw++, (struct DE_eckd_data *) data,
1364                               fdata->start_unit, fdata->start_unit,
1365                               DASD_ECKD_CCW_WRITE_CKD, device);
1366                 data += sizeof(struct DE_eckd_data);
1367                 ccw[-1].flags |= CCW_FLAG_CC;
1368                 locate_record(ccw++, (struct LO_eckd_data *) data,
1369                               fdata->start_unit, 0, 1,
1370                               DASD_ECKD_CCW_WRITE_CKD, device, 8);
1371                 data += sizeof(struct LO_eckd_data);
1372                 break;
1373         }
1374         if (fdata->intensity & 0x01) {  /* write record zero */
1375                 ect = (struct eckd_count *) data;
1376                 data += sizeof(struct eckd_count);
1377                 ect->cyl = cyl;
1378                 ect->head = head;
1379                 ect->record = 0;
1380                 ect->kl = 0;
1381                 ect->dl = 8;
1382                 ccw[-1].flags |= CCW_FLAG_CC;
1383                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
1384                 ccw->flags = CCW_FLAG_SLI;
1385                 ccw->count = 8;
1386                 ccw->cda = (__u32)(addr_t) ect;
1387                 ccw++;
1388         }
1389         if ((fdata->intensity & ~0x08) & 0x04) {        /* erase track */
1390                 ect = (struct eckd_count *) data;
1391                 data += sizeof(struct eckd_count);
1392                 ect->cyl = cyl;
1393                 ect->head = head;
1394                 ect->record = 1;
1395                 ect->kl = 0;
1396                 ect->dl = 0;
1397                 ccw[-1].flags |= CCW_FLAG_CC;
1398                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1399                 ccw->flags = CCW_FLAG_SLI;
1400                 ccw->count = 8;
1401                 ccw->cda = (__u32)(addr_t) ect;
1402         } else {                /* write remaining records */
1403                 for (i = 0; i < rpt; i++) {
1404                         ect = (struct eckd_count *) data;
1405                         data += sizeof(struct eckd_count);
1406                         ect->cyl = cyl;
1407                         ect->head = head;
1408                         ect->record = i + 1;
1409                         ect->kl = 0;
1410                         ect->dl = fdata->blksize;
1411                         /* Check for special tracks 0-1 when formatting CDL */
1412                         if ((fdata->intensity & 0x08) &&
1413                             fdata->start_unit == 0) {
1414                                 if (i < 3) {
1415                                         ect->kl = 4;
1416                                         ect->dl = sizes_trk0[i] - 4;
1417                                 }
1418                         }
1419                         if ((fdata->intensity & 0x08) &&
1420                             fdata->start_unit == 1) {
1421                                 ect->kl = 44;
1422                                 ect->dl = LABEL_SIZE - 44;
1423                         }
1424                         ccw[-1].flags |= CCW_FLAG_CC;
1425                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1426                         ccw->flags = CCW_FLAG_SLI;
1427                         ccw->count = 8;
1428                         ccw->cda = (__u32)(addr_t) ect;
1429                         ccw++;
1430                 }
1431         }
1432         fcp->startdev = device;
1433         fcp->memdev = device;
1434         clear_bit(DASD_CQR_FLAGS_USE_ERP, &fcp->flags);
1435         fcp->retries = 5;       /* set retry counter to enable default ERP */
1436         fcp->buildclk = get_clock();
1437         fcp->status = DASD_CQR_FILLED;
1438         return fcp;
1439 }
1440
1441 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
1442 {
1443         cqr->status = DASD_CQR_FILLED;
1444         if (cqr->block && (cqr->startdev != cqr->block->base)) {
1445                 dasd_eckd_reset_ccw_to_base_io(cqr);
1446                 cqr->startdev = cqr->block->base;
1447         }
1448 };
1449
1450 static dasd_erp_fn_t
1451 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
1452 {
1453         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
1454         struct ccw_device *cdev = device->cdev;
1455
1456         switch (cdev->id.cu_type) {
1457         case 0x3990:
1458         case 0x2105:
1459         case 0x2107:
1460         case 0x1750:
1461                 return dasd_3990_erp_action;
1462         case 0x9343:
1463         case 0x3880:
1464         default:
1465                 return dasd_default_erp_action;
1466         }
1467 }
1468
1469 static dasd_erp_fn_t
1470 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
1471 {
1472         return dasd_default_erp_postaction;
1473 }
1474
1475
1476 static void dasd_eckd_handle_unsolicited_interrupt(struct dasd_device *device,
1477                                                    struct irb *irb)
1478 {
1479         char mask;
1480
1481         /* first of all check for state change pending interrupt */
1482         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
1483         if ((irb->scsw.cmd.dstat & mask) == mask) {
1484                 dasd_generic_handle_state_change(device);
1485                 return;
1486         }
1487
1488         /* summary unit check */
1489         if ((irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
1490             (irb->ecw[7] == 0x0D)) {
1491                 dasd_alias_handle_summary_unit_check(device, irb);
1492                 return;
1493         }
1494
1495
1496         /* service information message SIM */
1497         if (irb->esw.esw0.erw.cons && (irb->ecw[27] & DASD_SENSE_BIT_0) &&
1498             ((irb->ecw[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
1499                 dasd_3990_erp_handle_sim(device, irb->ecw);
1500                 dasd_schedule_device_bh(device);
1501                 return;
1502         }
1503
1504         /* just report other unsolicited interrupts */
1505         DEV_MESSAGE(KERN_DEBUG, device, "%s",
1506                     "unsolicited interrupt received");
1507         device->discipline->dump_sense(device, NULL, irb);
1508         dasd_schedule_device_bh(device);
1509
1510         return;
1511 };
1512
1513 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
1514                                                struct dasd_block *block,
1515                                                struct request *req)
1516 {
1517         struct dasd_eckd_private *private;
1518         unsigned long *idaws;
1519         struct LO_eckd_data *LO_data;
1520         struct dasd_ccw_req *cqr;
1521         struct ccw1 *ccw;
1522         struct req_iterator iter;
1523         struct bio_vec *bv;
1524         char *dst;
1525         unsigned int blksize, blk_per_trk, off;
1526         int count, cidaw, cplength, datasize;
1527         sector_t recid, first_rec, last_rec;
1528         sector_t first_trk, last_trk;
1529         unsigned int first_offs, last_offs;
1530         unsigned char cmd, rcmd;
1531         int use_prefix;
1532         struct dasd_device *basedev;
1533
1534         basedev = block->base;
1535         private = (struct dasd_eckd_private *) basedev->private;
1536         if (rq_data_dir(req) == READ)
1537                 cmd = DASD_ECKD_CCW_READ_MT;
1538         else if (rq_data_dir(req) == WRITE)
1539                 cmd = DASD_ECKD_CCW_WRITE_MT;
1540         else
1541                 return ERR_PTR(-EINVAL);
1542         /* Calculate number of blocks/records per track. */
1543         blksize = block->bp_block;
1544         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
1545         /* Calculate record id of first and last block. */
1546         first_rec = first_trk = req->sector >> block->s2b_shift;
1547         first_offs = sector_div(first_trk, blk_per_trk);
1548         last_rec = last_trk =
1549                 (req->sector + req->nr_sectors - 1) >> block->s2b_shift;
1550         last_offs = sector_div(last_trk, blk_per_trk);
1551         /* Check struct bio and count the number of blocks for the request. */
1552         count = 0;
1553         cidaw = 0;
1554         rq_for_each_segment(bv, req, iter) {
1555                 if (bv->bv_len & (blksize - 1))
1556                         /* Eckd can only do full blocks. */
1557                         return ERR_PTR(-EINVAL);
1558                 count += bv->bv_len >> (block->s2b_shift + 9);
1559 #if defined(CONFIG_64BIT)
1560                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
1561                         cidaw += bv->bv_len >> (block->s2b_shift + 9);
1562 #endif
1563         }
1564         /* Paranoia. */
1565         if (count != last_rec - first_rec + 1)
1566                 return ERR_PTR(-EINVAL);
1567
1568         /* use the prefix command if available */
1569         use_prefix = private->features.feature[8] & 0x01;
1570         if (use_prefix) {
1571                 /* 1x prefix + number of blocks */
1572                 cplength = 2 + count;
1573                 /* 1x prefix + cidaws*sizeof(long) */
1574                 datasize = sizeof(struct PFX_eckd_data) +
1575                         sizeof(struct LO_eckd_data) +
1576                         cidaw * sizeof(unsigned long);
1577         } else {
1578                 /* 1x define extent + 1x locate record + number of blocks */
1579                 cplength = 2 + count;
1580                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
1581                 datasize = sizeof(struct DE_eckd_data) +
1582                         sizeof(struct LO_eckd_data) +
1583                         cidaw * sizeof(unsigned long);
1584         }
1585         /* Find out the number of additional locate record ccws for cdl. */
1586         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
1587                 if (last_rec >= 2*blk_per_trk)
1588                         count = 2*blk_per_trk - first_rec;
1589                 cplength += count;
1590                 datasize += count*sizeof(struct LO_eckd_data);
1591         }
1592         /* Allocate the ccw request. */
1593         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1594                                    cplength, datasize, startdev);
1595         if (IS_ERR(cqr))
1596                 return cqr;
1597         ccw = cqr->cpaddr;
1598         /* First ccw is define extent or prefix. */
1599         if (use_prefix) {
1600                 if (prefix(ccw++, cqr->data, first_trk,
1601                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
1602                         /* Clock not in sync and XRC is enabled.
1603                          * Try again later.
1604                          */
1605                         dasd_sfree_request(cqr, startdev);
1606                         return ERR_PTR(-EAGAIN);
1607                 }
1608                 idaws = (unsigned long *) (cqr->data +
1609                                            sizeof(struct PFX_eckd_data));
1610         } else {
1611                 if (define_extent(ccw++, cqr->data, first_trk,
1612                                   last_trk, cmd, startdev) == -EAGAIN) {
1613                         /* Clock not in sync and XRC is enabled.
1614                          * Try again later.
1615                          */
1616                         dasd_sfree_request(cqr, startdev);
1617                         return ERR_PTR(-EAGAIN);
1618                 }
1619                 idaws = (unsigned long *) (cqr->data +
1620                                            sizeof(struct DE_eckd_data));
1621         }
1622         /* Build locate_record+read/write/ccws. */
1623         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
1624         recid = first_rec;
1625         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
1626                 /* Only standard blocks so there is just one locate record. */
1627                 ccw[-1].flags |= CCW_FLAG_CC;
1628                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
1629                               last_rec - recid + 1, cmd, basedev, blksize);
1630         }
1631         rq_for_each_segment(bv, req, iter) {
1632                 dst = page_address(bv->bv_page) + bv->bv_offset;
1633                 if (dasd_page_cache) {
1634                         char *copy = kmem_cache_alloc(dasd_page_cache,
1635                                                       GFP_DMA | __GFP_NOWARN);
1636                         if (copy && rq_data_dir(req) == WRITE)
1637                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
1638                         if (copy)
1639                                 dst = copy + bv->bv_offset;
1640                 }
1641                 for (off = 0; off < bv->bv_len; off += blksize) {
1642                         sector_t trkid = recid;
1643                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
1644                         rcmd = cmd;
1645                         count = blksize;
1646                         /* Locate record for cdl special block ? */
1647                         if (private->uses_cdl && recid < 2*blk_per_trk) {
1648                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
1649                                         rcmd |= 0x8;
1650                                         count = dasd_eckd_cdl_reclen(recid);
1651                                         if (count < blksize &&
1652                                             rq_data_dir(req) == READ)
1653                                                 memset(dst + count, 0xe5,
1654                                                        blksize - count);
1655                                 }
1656                                 ccw[-1].flags |= CCW_FLAG_CC;
1657                                 locate_record(ccw++, LO_data++,
1658                                               trkid, recoffs + 1,
1659                                               1, rcmd, basedev, count);
1660                         }
1661                         /* Locate record for standard blocks ? */
1662                         if (private->uses_cdl && recid == 2*blk_per_trk) {
1663                                 ccw[-1].flags |= CCW_FLAG_CC;
1664                                 locate_record(ccw++, LO_data++,
1665                                               trkid, recoffs + 1,
1666                                               last_rec - recid + 1,
1667                                               cmd, basedev, count);
1668                         }
1669                         /* Read/write ccw. */
1670                         ccw[-1].flags |= CCW_FLAG_CC;
1671                         ccw->cmd_code = rcmd;
1672                         ccw->count = count;
1673                         if (idal_is_needed(dst, blksize)) {
1674                                 ccw->cda = (__u32)(addr_t) idaws;
1675                                 ccw->flags = CCW_FLAG_IDA;
1676                                 idaws = idal_create_words(idaws, dst, blksize);
1677                         } else {
1678                                 ccw->cda = (__u32)(addr_t) dst;
1679                                 ccw->flags = 0;
1680                         }
1681                         ccw++;
1682                         dst += blksize;
1683                         recid++;
1684                 }
1685         }
1686         if (req->cmd_flags & REQ_FAILFAST)
1687                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1688         cqr->startdev = startdev;
1689         cqr->memdev = startdev;
1690         cqr->block = block;
1691         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
1692         cqr->lpm = private->path_data.ppm;
1693         cqr->retries = 256;
1694         cqr->buildclk = get_clock();
1695         cqr->status = DASD_CQR_FILLED;
1696         return cqr;
1697 }
1698
1699 static int
1700 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
1701 {
1702         struct dasd_eckd_private *private;
1703         struct ccw1 *ccw;
1704         struct req_iterator iter;
1705         struct bio_vec *bv;
1706         char *dst, *cda;
1707         unsigned int blksize, blk_per_trk, off;
1708         sector_t recid;
1709         int status;
1710
1711         if (!dasd_page_cache)
1712                 goto out;
1713         private = (struct dasd_eckd_private *) cqr->block->base->private;
1714         blksize = cqr->block->bp_block;
1715         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
1716         recid = req->sector >> cqr->block->s2b_shift;
1717         ccw = cqr->cpaddr;
1718         /* Skip over define extent & locate record. */
1719         ccw++;
1720         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
1721                 ccw++;
1722         rq_for_each_segment(bv, req, iter) {
1723                 dst = page_address(bv->bv_page) + bv->bv_offset;
1724                 for (off = 0; off < bv->bv_len; off += blksize) {
1725                         /* Skip locate record. */
1726                         if (private->uses_cdl && recid <= 2*blk_per_trk)
1727                                 ccw++;
1728                         if (dst) {
1729                                 if (ccw->flags & CCW_FLAG_IDA)
1730                                         cda = *((char **)((addr_t) ccw->cda));
1731                                 else
1732                                         cda = (char *)((addr_t) ccw->cda);
1733                                 if (dst != cda) {
1734                                         if (rq_data_dir(req) == READ)
1735                                                 memcpy(dst, cda, bv->bv_len);
1736                                         kmem_cache_free(dasd_page_cache,
1737                                             (void *)((addr_t)cda & PAGE_MASK));
1738                                 }
1739                                 dst = NULL;
1740                         }
1741                         ccw++;
1742                         recid++;
1743                 }
1744         }
1745 out:
1746         status = cqr->status == DASD_CQR_DONE;
1747         dasd_sfree_request(cqr, cqr->memdev);
1748         return status;
1749 }
1750
1751 /*
1752  * Modify ccw chain in cqr so it can be started on a base device.
1753  *
1754  * Note that this is not enough to restart the cqr!
1755  * Either reset cqr->startdev as well (summary unit check handling)
1756  * or restart via separate cqr (as in ERP handling).
1757  */
1758 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
1759 {
1760         struct ccw1 *ccw;
1761         struct PFX_eckd_data *pfxdata;
1762
1763         ccw = cqr->cpaddr;
1764         pfxdata = cqr->data;
1765
1766         if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
1767                 pfxdata->validity.verify_base = 0;
1768                 pfxdata->validity.hyper_pav = 0;
1769         }
1770 }
1771
1772 #define DASD_ECKD_CHANQ_MAX_SIZE 4
1773
1774 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
1775                                                      struct dasd_block *block,
1776                                                      struct request *req)
1777 {
1778         struct dasd_eckd_private *private;
1779         struct dasd_device *startdev;
1780         unsigned long flags;
1781         struct dasd_ccw_req *cqr;
1782
1783         startdev = dasd_alias_get_start_dev(base);
1784         if (!startdev)
1785                 startdev = base;
1786         private = (struct dasd_eckd_private *) startdev->private;
1787         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
1788                 return ERR_PTR(-EBUSY);
1789
1790         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
1791         private->count++;
1792         cqr = dasd_eckd_build_cp(startdev, block, req);
1793         if (IS_ERR(cqr))
1794                 private->count--;
1795         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
1796         return cqr;
1797 }
1798
1799 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
1800                                    struct request *req)
1801 {
1802         struct dasd_eckd_private *private;
1803         unsigned long flags;
1804
1805         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
1806         private = (struct dasd_eckd_private *) cqr->memdev->private;
1807         private->count--;
1808         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
1809         return dasd_eckd_free_cp(cqr, req);
1810 }
1811
1812 static int
1813 dasd_eckd_fill_info(struct dasd_device * device,
1814                     struct dasd_information2_t * info)
1815 {
1816         struct dasd_eckd_private *private;
1817
1818         private = (struct dasd_eckd_private *) device->private;
1819         info->label_block = 2;
1820         info->FBA_layout = private->uses_cdl ? 0 : 1;
1821         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
1822         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
1823         memcpy(info->characteristics, &private->rdc_data,
1824                sizeof(struct dasd_eckd_characteristics));
1825         info->confdata_size = min((unsigned long)private->conf_len,
1826                                   sizeof(info->configuration_data));
1827         memcpy(info->configuration_data, private->conf_data,
1828                info->confdata_size);
1829         return 0;
1830 }
1831
1832 /*
1833  * SECTION: ioctl functions for eckd devices.
1834  */
1835
1836 /*
1837  * Release device ioctl.
1838  * Buils a channel programm to releases a prior reserved
1839  * (see dasd_eckd_reserve) device.
1840  */
1841 static int
1842 dasd_eckd_release(struct dasd_device *device)
1843 {
1844         struct dasd_ccw_req *cqr;
1845         int rc;
1846
1847         if (!capable(CAP_SYS_ADMIN))
1848                 return -EACCES;
1849
1850         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1851                                    1, 32, device);
1852         if (IS_ERR(cqr)) {
1853                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1854                             "Could not allocate initialization request");
1855                 return PTR_ERR(cqr);
1856         }
1857         cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RELEASE;
1858         cqr->cpaddr->flags |= CCW_FLAG_SLI;
1859         cqr->cpaddr->count = 32;
1860         cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1861         cqr->startdev = device;
1862         cqr->memdev = device;
1863         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1864         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1865         cqr->retries = 2;       /* set retry counter to enable basic ERP */
1866         cqr->expires = 2 * HZ;
1867         cqr->buildclk = get_clock();
1868         cqr->status = DASD_CQR_FILLED;
1869
1870         rc = dasd_sleep_on_immediatly(cqr);
1871
1872         dasd_sfree_request(cqr, cqr->memdev);
1873         return rc;
1874 }
1875
1876 /*
1877  * Reserve device ioctl.
1878  * Options are set to 'synchronous wait for interrupt' and
1879  * 'timeout the request'. This leads to a terminate IO if
1880  * the interrupt is outstanding for a certain time.
1881  */
1882 static int
1883 dasd_eckd_reserve(struct dasd_device *device)
1884 {
1885         struct dasd_ccw_req *cqr;
1886         int rc;
1887
1888         if (!capable(CAP_SYS_ADMIN))
1889                 return -EACCES;
1890
1891         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1892                                    1, 32, device);
1893         if (IS_ERR(cqr)) {
1894                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1895                             "Could not allocate initialization request");
1896                 return PTR_ERR(cqr);
1897         }
1898         cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RESERVE;
1899         cqr->cpaddr->flags |= CCW_FLAG_SLI;
1900         cqr->cpaddr->count = 32;
1901         cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1902         cqr->startdev = device;
1903         cqr->memdev = device;
1904         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1905         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1906         cqr->retries = 2;       /* set retry counter to enable basic ERP */
1907         cqr->expires = 2 * HZ;
1908         cqr->buildclk = get_clock();
1909         cqr->status = DASD_CQR_FILLED;
1910
1911         rc = dasd_sleep_on_immediatly(cqr);
1912
1913         dasd_sfree_request(cqr, cqr->memdev);
1914         return rc;
1915 }
1916
1917 /*
1918  * Steal lock ioctl - unconditional reserve device.
1919  * Buils a channel programm to break a device's reservation.
1920  * (unconditional reserve)
1921  */
1922 static int
1923 dasd_eckd_steal_lock(struct dasd_device *device)
1924 {
1925         struct dasd_ccw_req *cqr;
1926         int rc;
1927
1928         if (!capable(CAP_SYS_ADMIN))
1929                 return -EACCES;
1930
1931         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1932                                    1, 32, device);
1933         if (IS_ERR(cqr)) {
1934                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1935                             "Could not allocate initialization request");
1936                 return PTR_ERR(cqr);
1937         }
1938         cqr->cpaddr->cmd_code = DASD_ECKD_CCW_SLCK;
1939         cqr->cpaddr->flags |= CCW_FLAG_SLI;
1940         cqr->cpaddr->count = 32;
1941         cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1942         cqr->startdev = device;
1943         cqr->memdev = device;
1944         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1945         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1946         cqr->retries = 2;       /* set retry counter to enable basic ERP */
1947         cqr->expires = 2 * HZ;
1948         cqr->buildclk = get_clock();
1949         cqr->status = DASD_CQR_FILLED;
1950
1951         rc = dasd_sleep_on_immediatly(cqr);
1952
1953         dasd_sfree_request(cqr, cqr->memdev);
1954         return rc;
1955 }
1956
1957 /*
1958  * Read performance statistics
1959  */
1960 static int
1961 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
1962 {
1963         struct dasd_psf_prssd_data *prssdp;
1964         struct dasd_rssd_perf_stats_t *stats;
1965         struct dasd_ccw_req *cqr;
1966         struct ccw1 *ccw;
1967         int rc;
1968
1969         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1970                                    1 /* PSF */  + 1 /* RSSD */ ,
1971                                    (sizeof(struct dasd_psf_prssd_data) +
1972                                     sizeof(struct dasd_rssd_perf_stats_t)),
1973                                    device);
1974         if (IS_ERR(cqr)) {
1975                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1976                             "Could not allocate initialization request");
1977                 return PTR_ERR(cqr);
1978         }
1979         cqr->startdev = device;
1980         cqr->memdev = device;
1981         cqr->retries = 0;
1982         cqr->expires = 10 * HZ;
1983
1984         /* Prepare for Read Subsystem Data */
1985         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1986         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1987         prssdp->order = PSF_ORDER_PRSSD;
1988         prssdp->suborder = 0x01;        /* Performance Statistics */
1989         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
1990
1991         ccw = cqr->cpaddr;
1992         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1993         ccw->count = sizeof(struct dasd_psf_prssd_data);
1994         ccw->flags |= CCW_FLAG_CC;
1995         ccw->cda = (__u32)(addr_t) prssdp;
1996
1997         /* Read Subsystem Data - Performance Statistics */
1998         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
1999         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
2000
2001         ccw++;
2002         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
2003         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
2004         ccw->cda = (__u32)(addr_t) stats;
2005
2006         cqr->buildclk = get_clock();
2007         cqr->status = DASD_CQR_FILLED;
2008         rc = dasd_sleep_on(cqr);
2009         if (rc == 0) {
2010                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
2011                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
2012                 if (copy_to_user(argp, stats,
2013                                  sizeof(struct dasd_rssd_perf_stats_t)))
2014                         rc = -EFAULT;
2015         }
2016         dasd_sfree_request(cqr, cqr->memdev);
2017         return rc;
2018 }
2019
2020 /*
2021  * Get attributes (cache operations)
2022  * Returnes the cache attributes used in Define Extend (DE).
2023  */
2024 static int
2025 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
2026 {
2027         struct dasd_eckd_private *private =
2028                 (struct dasd_eckd_private *)device->private;
2029         struct attrib_data_t attrib = private->attrib;
2030         int rc;
2031
2032         if (!capable(CAP_SYS_ADMIN))
2033                 return -EACCES;
2034         if (!argp)
2035                 return -EINVAL;
2036
2037         rc = 0;
2038         if (copy_to_user(argp, (long *) &attrib,
2039                          sizeof(struct attrib_data_t)))
2040                 rc = -EFAULT;
2041
2042         return rc;
2043 }
2044
2045 /*
2046  * Set attributes (cache operations)
2047  * Stores the attributes for cache operation to be used in Define Extend (DE).
2048  */
2049 static int
2050 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
2051 {
2052         struct dasd_eckd_private *private =
2053                 (struct dasd_eckd_private *)device->private;
2054         struct attrib_data_t attrib;
2055
2056         if (!capable(CAP_SYS_ADMIN))
2057                 return -EACCES;
2058         if (!argp)
2059                 return -EINVAL;
2060
2061         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
2062                 return -EFAULT;
2063         private->attrib = attrib;
2064
2065         DEV_MESSAGE(KERN_INFO, device,
2066                     "cache operation mode set to %x (%i cylinder prestage)",
2067                     private->attrib.operation, private->attrib.nr_cyl);
2068         return 0;
2069 }
2070
2071 static int
2072 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
2073 {
2074         struct dasd_device *device = block->base;
2075
2076         switch (cmd) {
2077         case BIODASDGATTR:
2078                 return dasd_eckd_get_attrib(device, argp);
2079         case BIODASDSATTR:
2080                 return dasd_eckd_set_attrib(device, argp);
2081         case BIODASDPSRD:
2082                 return dasd_eckd_performance(device, argp);
2083         case BIODASDRLSE:
2084                 return dasd_eckd_release(device);
2085         case BIODASDRSRV:
2086                 return dasd_eckd_reserve(device);
2087         case BIODASDSLCK:
2088                 return dasd_eckd_steal_lock(device);
2089         default:
2090                 return -ENOIOCTLCMD;
2091         }
2092 }
2093
2094 /*
2095  * Dump the range of CCWs into 'page' buffer
2096  * and return number of printed chars.
2097  */
2098 static int
2099 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
2100 {
2101         int len, count;
2102         char *datap;
2103
2104         len = 0;
2105         while (from <= to) {
2106                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2107                                " CCW %p: %08X %08X DAT:",
2108                                from, ((int *) from)[0], ((int *) from)[1]);
2109
2110                 /* get pointer to data (consider IDALs) */
2111                 if (from->flags & CCW_FLAG_IDA)
2112                         datap = (char *) *((addr_t *) (addr_t) from->cda);
2113                 else
2114                         datap = (char *) ((addr_t) from->cda);
2115
2116                 /* dump data (max 32 bytes) */
2117                 for (count = 0; count < from->count && count < 32; count++) {
2118                         if (count % 8 == 0) len += sprintf(page + len, " ");
2119                         if (count % 4 == 0) len += sprintf(page + len, " ");
2120                         len += sprintf(page + len, "%02x", datap[count]);
2121                 }
2122                 len += sprintf(page + len, "\n");
2123                 from++;
2124         }
2125         return len;
2126 }
2127
2128 /*
2129  * Print sense data and related channel program.
2130  * Parts are printed because printk buffer is only 1024 bytes.
2131  */
2132 static void dasd_eckd_dump_sense(struct dasd_device *device,
2133                                  struct dasd_ccw_req *req, struct irb *irb)
2134 {
2135         char *page;
2136         struct ccw1 *first, *last, *fail, *from, *to;
2137         int len, sl, sct;
2138
2139         page = (char *) get_zeroed_page(GFP_ATOMIC);
2140         if (page == NULL) {
2141                 DEV_MESSAGE(KERN_ERR, device, " %s",
2142                             "No memory to dump sense data");
2143                 return;
2144         }
2145         /* dump the sense data */
2146         len = sprintf(page,  KERN_ERR PRINTK_HEADER
2147                       " I/O status report for device %s:\n",
2148                       device->cdev->dev.bus_id);
2149         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2150                        " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
2151                        irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
2152         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2153                        " device %s: Failing CCW: %p\n",
2154                        device->cdev->dev.bus_id,
2155                        (void *) (addr_t) irb->scsw.cmd.cpa);
2156         if (irb->esw.esw0.erw.cons) {
2157                 for (sl = 0; sl < 4; sl++) {
2158                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2159                                        " Sense(hex) %2d-%2d:",
2160                                        (8 * sl), ((8 * sl) + 7));
2161
2162                         for (sct = 0; sct < 8; sct++) {
2163                                 len += sprintf(page + len, " %02x",
2164                                                irb->ecw[8 * sl + sct]);
2165                         }
2166                         len += sprintf(page + len, "\n");
2167                 }
2168
2169                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
2170                         /* 24 Byte Sense Data */
2171                         sprintf(page + len, KERN_ERR PRINTK_HEADER
2172                                 " 24 Byte: %x MSG %x, "
2173                                 "%s MSGb to SYSOP\n",
2174                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
2175                                 irb->ecw[1] & 0x10 ? "" : "no");
2176                 } else {
2177                         /* 32 Byte Sense Data */
2178                         sprintf(page + len, KERN_ERR PRINTK_HEADER
2179                                 " 32 Byte: Format: %x "
2180                                 "Exception class %x\n",
2181                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
2182                 }
2183         } else {
2184                 sprintf(page + len, KERN_ERR PRINTK_HEADER
2185                         " SORRY - NO VALID SENSE AVAILABLE\n");
2186         }
2187         printk("%s", page);
2188
2189         if (req) {
2190                 /* req == NULL for unsolicited interrupts */
2191                 /* dump the Channel Program (max 140 Bytes per line) */
2192                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
2193                 first = req->cpaddr;
2194                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
2195                 to = min(first + 6, last);
2196                 len = sprintf(page,  KERN_ERR PRINTK_HEADER
2197                               " Related CP in req: %p\n", req);
2198                 dasd_eckd_dump_ccw_range(first, to, page + len);
2199                 printk("%s", page);
2200
2201                 /* print failing CCW area (maximum 4) */
2202                 /* scsw->cda is either valid or zero  */
2203                 len = 0;
2204                 from = ++to;
2205                 fail = (struct ccw1 *)(addr_t)
2206                                 irb->scsw.cmd.cpa; /* failing CCW */
2207                 if (from <  fail - 2) {
2208                         from = fail - 2;     /* there is a gap - print header */
2209                         len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
2210                 }
2211                 to = min(fail + 1, last);
2212                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
2213
2214                 /* print last CCWs (maximum 2) */
2215                 from = max(from, ++to);
2216                 if (from < last - 1) {
2217                         from = last - 1;     /* there is a gap - print header */
2218                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
2219                 }
2220                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
2221                 if (len > 0)
2222                         printk("%s", page);
2223         }
2224         free_page((unsigned long) page);
2225 }
2226
2227 /*
2228  * max_blocks is dependent on the amount of storage that is available
2229  * in the static io buffer for each device. Currently each device has
2230  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
2231  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
2232  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
2233  * addition we have one define extent ccw + 16 bytes of data and one
2234  * locate record ccw + 16 bytes of data. That makes:
2235  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
2236  * We want to fit two into the available memory so that we can immediately
2237  * start the next request if one finishes off. That makes 249.5 blocks
2238  * for one request. Give a little safety and the result is 240.
2239  */
2240 static struct dasd_discipline dasd_eckd_discipline = {
2241         .owner = THIS_MODULE,
2242         .name = "ECKD",
2243         .ebcname = "ECKD",
2244         .max_blocks = 240,
2245         .check_device = dasd_eckd_check_characteristics,
2246         .uncheck_device = dasd_eckd_uncheck_device,
2247         .do_analysis = dasd_eckd_do_analysis,
2248         .ready_to_online = dasd_eckd_ready_to_online,
2249         .online_to_ready = dasd_eckd_online_to_ready,
2250         .fill_geometry = dasd_eckd_fill_geometry,
2251         .start_IO = dasd_start_IO,
2252         .term_IO = dasd_term_IO,
2253         .handle_terminated_request = dasd_eckd_handle_terminated_request,
2254         .format_device = dasd_eckd_format_device,
2255         .erp_action = dasd_eckd_erp_action,
2256         .erp_postaction = dasd_eckd_erp_postaction,
2257         .handle_unsolicited_interrupt = dasd_eckd_handle_unsolicited_interrupt,
2258         .build_cp = dasd_eckd_build_alias_cp,
2259         .free_cp = dasd_eckd_free_alias_cp,
2260         .dump_sense = dasd_eckd_dump_sense,
2261         .fill_info = dasd_eckd_fill_info,
2262         .ioctl = dasd_eckd_ioctl,
2263 };
2264
2265 static int __init
2266 dasd_eckd_init(void)
2267 {
2268         ASCEBC(dasd_eckd_discipline.ebcname, 4);
2269         return ccw_driver_register(&dasd_eckd_driver);
2270 }
2271
2272 static void __exit
2273 dasd_eckd_cleanup(void)
2274 {
2275         ccw_driver_unregister(&dasd_eckd_driver);
2276 }
2277
2278 module_init(dasd_eckd_init);
2279 module_exit(dasd_eckd_cleanup);