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  * Copyright IBM Corp. 1999, 2009
   9  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
  10  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
  11  */
  12
  13 #define KMSG_COMPONENT "dasd-eckd"
  14
  15 #include <linux/stddef.h>
  16 #include <linux/kernel.h>
  17 #include <linux/slab.h>
  18 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  19 #include <linux/bio.h>
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22
  23 #include <asm/debug.h>
  24 #include <asm/idals.h>
  25 #include <asm/ebcdic.h>
  26 #include <asm/compat.h>
  27 #include <asm/io.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/cio.h>
  30 #include <asm/ccwdev.h>
  31 #include <asm/itcw.h>
  32
  33 #include "dasd_int.h"
  34 #include "dasd_eckd.h"
  35 #include "../cio/chsc.h"
  36
  37
  38 #ifdef PRINTK_HEADER
  39 #undef PRINTK_HEADER
  40 #endif                          /* PRINTK_HEADER */
  41 #define PRINTK_HEADER "dasd(eckd):"
  42
  43 #define ECKD_C0(i) (i->home_bytes)
  44 #define ECKD_F(i) (i->formula)
  45 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
  46                     (i->factors.f_0x02.f1))
  47 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
  48                     (i->factors.f_0x02.f2))
  49 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
  50                     (i->factors.f_0x02.f3))
  51 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
  52 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
  53 #define ECKD_F6(i) (i->factor6)
  54 #define ECKD_F7(i) (i->factor7)
  55 #define ECKD_F8(i) (i->factor8)
  56
  57 MODULE_LICENSE("GPL");
  58
  59 static struct dasd_discipline dasd_eckd_discipline;
  60
  61 /* The ccw bus type uses this table to find devices that it sends to
  62  * dasd_eckd_probe */
  63 static struct ccw_device_id dasd_eckd_ids[] = {
  64         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
  65         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
  66         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3390, 0), .driver_info = 0x3},
  67         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
  68         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
  69         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
  70         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
  71         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
  72         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
  73         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
  74         { /* end of list */ },
  75 };
  76
  77 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  78
  79 static struct ccw_driver dasd_eckd_driver; /* see below */
  80
  81 #define INIT_CQR_OK 0
  82 #define INIT_CQR_UNFORMATTED 1
  83 #define INIT_CQR_ERROR 2
  84
  85
  86 /* initial attempt at a probe function. this can be simplified once
  87  * the other detection code is gone */
  88 static int
  89 dasd_eckd_probe (struct ccw_device *cdev)
  90 {
  91         int ret;
  92
  93         /* set ECKD specific ccw-device options */
  94         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
  95                                      CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
  96         if (ret) {
  97                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
  98                                 "dasd_eckd_probe: could not set "
  99                                 "ccw-device options");
 100                 return ret;
 101         }
 102         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
 103         return ret;
 104 }
 105
 106 static int
 107 dasd_eckd_set_online(struct ccw_device *cdev)
 108 {
 109         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
 110 }
 111
 112 static const int sizes_trk0[] = { 28, 148, 84 };
 113 #define LABEL_SIZE 140
 114
 115 static inline unsigned int
 116 round_up_multiple(unsigned int no, unsigned int mult)
 117 {
 118         int rem = no % mult;
 119         return (rem ? no - rem + mult : no);
 120 }
 121
 122 static inline unsigned int
 123 ceil_quot(unsigned int d1, unsigned int d2)
 124 {
 125         return (d1 + (d2 - 1)) / d2;
 126 }
 127
 128 static unsigned int
 129 recs_per_track(struct dasd_eckd_characteristics * rdc,
 130                unsigned int kl, unsigned int dl)
 131 {
 132         int dn, kn;
 133
 134         switch (rdc->dev_type) {
 135         case 0x3380:
 136                 if (kl)
 137                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 138                                        ceil_quot(dl + 12, 32));
 139                 else
 140                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 141         case 0x3390:
 142                 dn = ceil_quot(dl + 6, 232) + 1;
 143                 if (kl) {
 144                         kn = ceil_quot(kl + 6, 232) + 1;
 145                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 146                                        9 + ceil_quot(dl + 6 * dn, 34));
 147                 } else
 148                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 149         case 0x9345:
 150                 dn = ceil_quot(dl + 6, 232) + 1;
 151                 if (kl) {
 152                         kn = ceil_quot(kl + 6, 232) + 1;
 153                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 154                                        ceil_quot(dl + 6 * dn, 34));
 155                 } else
 156                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 157         }
 158         return 0;
 159 }
 160
 161 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
 162 {
 163         geo->cyl = (__u16) cyl;
 164         geo->head = cyl >> 16;
 165         geo->head <<= 4;
 166         geo->head |= head;
 167 }
 168
 169 static int
 170 check_XRC (struct ccw1         *de_ccw,
 171            struct DE_eckd_data *data,
 172            struct dasd_device  *device)
 173 {
 174         struct dasd_eckd_private *private;
 175         int rc;
 176
 177         private = (struct dasd_eckd_private *) device->private;
 178         if (!private->rdc_data.facilities.XRC_supported)
 179                 return 0;
 180
 181         /* switch on System Time Stamp - needed for XRC Support */
 182         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 183         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 184
 185         rc = get_sync_clock(&data->ep_sys_time);
 186         /* Ignore return code if sync clock is switched off. */
 187         if (rc == -ENOSYS || rc == -EACCES)
 188                 rc = 0;
 189
 190         de_ccw->count = sizeof(struct DE_eckd_data);
 191         de_ccw->flags |= CCW_FLAG_SLI;
 192         return rc;
 193 }
 194
 195 static int
 196 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
 197               unsigned int totrk, int cmd, struct dasd_device *device)
 198 {
 199         struct dasd_eckd_private *private;
 200         u32 begcyl, endcyl;
 201         u16 heads, beghead, endhead;
 202         int rc = 0;
 203
 204         private = (struct dasd_eckd_private *) device->private;
 205
 206         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 207         ccw->flags = 0;
 208         ccw->count = 16;
 209         ccw->cda = (__u32) __pa(data);
 210
 211         memset(data, 0, sizeof(struct DE_eckd_data));
 212         switch (cmd) {
 213         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 214         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 215         case DASD_ECKD_CCW_READ:
 216         case DASD_ECKD_CCW_READ_MT:
 217         case DASD_ECKD_CCW_READ_CKD:
 218         case DASD_ECKD_CCW_READ_CKD_MT:
 219         case DASD_ECKD_CCW_READ_KD:
 220         case DASD_ECKD_CCW_READ_KD_MT:
 221         case DASD_ECKD_CCW_READ_COUNT:
 222                 data->mask.perm = 0x1;
 223                 data->attributes.operation = private->attrib.operation;
 224                 break;
 225         case DASD_ECKD_CCW_WRITE:
 226         case DASD_ECKD_CCW_WRITE_MT:
 227         case DASD_ECKD_CCW_WRITE_KD:
 228         case DASD_ECKD_CCW_WRITE_KD_MT:
 229                 data->mask.perm = 0x02;
 230                 data->attributes.operation = private->attrib.operation;
 231                 rc = check_XRC (ccw, data, device);
 232                 break;
 233         case DASD_ECKD_CCW_WRITE_CKD:
 234         case DASD_ECKD_CCW_WRITE_CKD_MT:
 235                 data->attributes.operation = DASD_BYPASS_CACHE;
 236                 rc = check_XRC (ccw, data, device);
 237                 break;
 238         case DASD_ECKD_CCW_ERASE:
 239         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 240         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 241                 data->mask.perm = 0x3;
 242                 data->mask.auth = 0x1;
 243                 data->attributes.operation = DASD_BYPASS_CACHE;
 244                 rc = check_XRC (ccw, data, device);
 245                 break;
 246         default:
 247                 dev_err(&device->cdev->dev,
 248                         "0x%x is not a known command\n", cmd);
 249                 break;
 250         }
 251
 252         data->attributes.mode = 0x3;    /* ECKD */
 253
 254         if ((private->rdc_data.cu_type == 0x2105 ||
 255              private->rdc_data.cu_type == 0x2107 ||
 256              private->rdc_data.cu_type == 0x1750)
 257             && !(private->uses_cdl && trk < 2))
 258                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 259
 260         heads = private->rdc_data.trk_per_cyl;
 261         begcyl = trk / heads;
 262         beghead = trk % heads;
 263         endcyl = totrk / heads;
 264         endhead = totrk % heads;
 265
 266         /* check for sequential prestage - enhance cylinder range */
 267         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 268             data->attributes.operation == DASD_SEQ_ACCESS) {
 269
 270                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
 271                         endcyl += private->attrib.nr_cyl;
 272                 else
 273                         endcyl = (private->real_cyl - 1);
 274         }
 275
 276         set_ch_t(&data->beg_ext, begcyl, beghead);
 277         set_ch_t(&data->end_ext, endcyl, endhead);
 278         return rc;
 279 }
 280
 281 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
 282                                struct dasd_device  *device)
 283 {
 284         struct dasd_eckd_private *private;
 285         int rc;
 286
 287         private = (struct dasd_eckd_private *) device->private;
 288         if (!private->rdc_data.facilities.XRC_supported)
 289                 return 0;
 290
 291         /* switch on System Time Stamp - needed for XRC Support */
 292         pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid'   */
 293         pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
 294         pfxdata->validity.time_stamp = 1;           /* 'Time Stamp Valid'   */
 295
 296         rc = get_sync_clock(&pfxdata->define_extent.ep_sys_time);
 297         /* Ignore return code if sync clock is switched off. */
 298         if (rc == -ENOSYS || rc == -EACCES)
 299                 rc = 0;
 300         return rc;
 301 }
 302
 303 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
 304                           unsigned int rec_on_trk, int count, int cmd,
 305                           struct dasd_device *device, unsigned int reclen,
 306                           unsigned int tlf)
 307 {
 308         struct dasd_eckd_private *private;
 309         int sector;
 310         int dn, d;
 311
 312         private = (struct dasd_eckd_private *) device->private;
 313
 314         memset(data, 0, sizeof(*data));
 315         sector = 0;
 316         if (rec_on_trk) {
 317                 switch (private->rdc_data.dev_type) {
 318                 case 0x3390:
 319                         dn = ceil_quot(reclen + 6, 232);
 320                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 321                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 322                         break;
 323                 case 0x3380:
 324                         d = 7 + ceil_quot(reclen + 12, 32);
 325                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 326                         break;
 327                 }
 328         }
 329         data->sector = sector;
 330         /* note: meaning of count depends on the operation
 331          *       for record based I/O it's the number of records, but for
 332          *       track based I/O it's the number of tracks
 333          */
 334         data->count = count;
 335         switch (cmd) {
 336         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 337                 data->operation.orientation = 0x3;
 338                 data->operation.operation = 0x03;
 339                 break;
 340         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 341                 data->operation.orientation = 0x3;
 342                 data->operation.operation = 0x16;
 343                 break;
 344         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 345                 data->operation.orientation = 0x1;
 346                 data->operation.operation = 0x03;
 347                 data->count++;
 348                 break;
 349         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 350                 data->operation.orientation = 0x3;
 351                 data->operation.operation = 0x16;
 352                 data->count++;
 353                 break;
 354         case DASD_ECKD_CCW_WRITE:
 355         case DASD_ECKD_CCW_WRITE_MT:
 356         case DASD_ECKD_CCW_WRITE_KD:
 357         case DASD_ECKD_CCW_WRITE_KD_MT:
 358                 data->auxiliary.length_valid = 0x1;
 359                 data->length = reclen;
 360                 data->operation.operation = 0x01;
 361                 break;
 362         case DASD_ECKD_CCW_WRITE_CKD:
 363         case DASD_ECKD_CCW_WRITE_CKD_MT:
 364                 data->auxiliary.length_valid = 0x1;
 365                 data->length = reclen;
 366                 data->operation.operation = 0x03;
 367                 break;
 368         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 369                 data->auxiliary.length_valid = 0x1;
 370                 data->length = reclen;  /* not tlf, as one might think */
 371                 data->operation.operation = 0x3F;
 372                 data->extended_operation = 0x23;
 373                 break;
 374         case DASD_ECKD_CCW_READ:
 375         case DASD_ECKD_CCW_READ_MT:
 376         case DASD_ECKD_CCW_READ_KD:
 377         case DASD_ECKD_CCW_READ_KD_MT:
 378                 data->auxiliary.length_valid = 0x1;
 379                 data->length = reclen;
 380                 data->operation.operation = 0x06;
 381                 break;
 382         case DASD_ECKD_CCW_READ_CKD:
 383         case DASD_ECKD_CCW_READ_CKD_MT:
 384                 data->auxiliary.length_valid = 0x1;
 385                 data->length = reclen;
 386                 data->operation.operation = 0x16;
 387                 break;
 388         case DASD_ECKD_CCW_READ_COUNT:
 389                 data->operation.operation = 0x06;
 390                 break;
 391         case DASD_ECKD_CCW_READ_TRACK_DATA:
 392                 data->auxiliary.length_valid = 0x1;
 393                 data->length = tlf;
 394                 data->operation.operation = 0x0C;
 395                 break;
 396         case DASD_ECKD_CCW_ERASE:
 397                 data->length = reclen;
 398                 data->auxiliary.length_valid = 0x1;
 399                 data->operation.operation = 0x0b;
 400                 break;
 401         default:
 402                 DBF_DEV_EVENT(DBF_ERR, device,
 403                             "fill LRE unknown opcode 0x%x", cmd);
 404                 BUG();
 405         }
 406         set_ch_t(&data->seek_addr,
 407                  trk / private->rdc_data.trk_per_cyl,
 408                  trk % private->rdc_data.trk_per_cyl);
 409         data->search_arg.cyl = data->seek_addr.cyl;
 410         data->search_arg.head = data->seek_addr.head;
 411         data->search_arg.record = rec_on_trk;
 412 }
 413
 414 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 415                       unsigned int trk, unsigned int totrk, int cmd,
 416                       struct dasd_device *basedev, struct dasd_device *startdev,
 417                       unsigned char format, unsigned int rec_on_trk, int count,
 418                       unsigned int blksize, unsigned int tlf)
 419 {
 420         struct dasd_eckd_private *basepriv, *startpriv;
 421         struct DE_eckd_data *dedata;
 422         struct LRE_eckd_data *lredata;
 423         u32 begcyl, endcyl;
 424         u16 heads, beghead, endhead;
 425         int rc = 0;
 426
 427         basepriv = (struct dasd_eckd_private *) basedev->private;
 428         startpriv = (struct dasd_eckd_private *) startdev->private;
 429         dedata = &pfxdata->define_extent;
 430         lredata = &pfxdata->locate_record;
 431
 432         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 433         ccw->flags = 0;
 434         ccw->count = sizeof(*pfxdata);
 435         ccw->cda = (__u32) __pa(pfxdata);
 436
 437         memset(pfxdata, 0, sizeof(*pfxdata));
 438         /* prefix data */
 439         if (format > 1) {
 440                 DBF_DEV_EVENT(DBF_ERR, basedev,
 441                               "PFX LRE unknown format 0x%x", format);
 442                 BUG();
 443                 return -EINVAL;
 444         }
 445         pfxdata->format = format;
 446         pfxdata->base_address = basepriv->ned->unit_addr;
 447         pfxdata->base_lss = basepriv->ned->ID;
 448         pfxdata->validity.define_extent = 1;
 449
 450         /* private uid is kept up to date, conf_data may be outdated */
 451         if (startpriv->uid.type != UA_BASE_DEVICE) {
 452                 pfxdata->validity.verify_base = 1;
 453                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
 454                         pfxdata->validity.hyper_pav = 1;
 455         }
 456
 457         /* define extend data (mostly)*/
 458         switch (cmd) {
 459         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 460         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 461         case DASD_ECKD_CCW_READ:
 462         case DASD_ECKD_CCW_READ_MT:
 463         case DASD_ECKD_CCW_READ_CKD:
 464         case DASD_ECKD_CCW_READ_CKD_MT:
 465         case DASD_ECKD_CCW_READ_KD:
 466         case DASD_ECKD_CCW_READ_KD_MT:
 467         case DASD_ECKD_CCW_READ_COUNT:
 468                 dedata->mask.perm = 0x1;
 469                 dedata->attributes.operation = basepriv->attrib.operation;
 470                 break;
 471         case DASD_ECKD_CCW_READ_TRACK_DATA:
 472                 dedata->mask.perm = 0x1;
 473                 dedata->attributes.operation = basepriv->attrib.operation;
 474                 dedata->blk_size = 0;
 475                 break;
 476         case DASD_ECKD_CCW_WRITE:
 477         case DASD_ECKD_CCW_WRITE_MT:
 478         case DASD_ECKD_CCW_WRITE_KD:
 479         case DASD_ECKD_CCW_WRITE_KD_MT:
 480                 dedata->mask.perm = 0x02;
 481                 dedata->attributes.operation = basepriv->attrib.operation;
 482                 rc = check_XRC_on_prefix(pfxdata, basedev);
 483                 break;
 484         case DASD_ECKD_CCW_WRITE_CKD:
 485         case DASD_ECKD_CCW_WRITE_CKD_MT:
 486                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 487                 rc = check_XRC_on_prefix(pfxdata, basedev);
 488                 break;
 489         case DASD_ECKD_CCW_ERASE:
 490         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 491         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 492                 dedata->mask.perm = 0x3;
 493                 dedata->mask.auth = 0x1;
 494                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 495                 rc = check_XRC_on_prefix(pfxdata, basedev);
 496                 break;
 497         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 498                 dedata->mask.perm = 0x02;
 499                 dedata->attributes.operation = basepriv->attrib.operation;
 500                 dedata->blk_size = blksize;
 501                 rc = check_XRC_on_prefix(pfxdata, basedev);
 502                 break;
 503         default:
 504                 DBF_DEV_EVENT(DBF_ERR, basedev,
 505                             "PFX LRE unknown opcode 0x%x", cmd);
 506                 BUG();
 507                 return -EINVAL;
 508         }
 509
 510         dedata->attributes.mode = 0x3;  /* ECKD */
 511
 512         if ((basepriv->rdc_data.cu_type == 0x2105 ||
 513              basepriv->rdc_data.cu_type == 0x2107 ||
 514              basepriv->rdc_data.cu_type == 0x1750)
 515             && !(basepriv->uses_cdl && trk < 2))
 516                 dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
 517
 518         heads = basepriv->rdc_data.trk_per_cyl;
 519         begcyl = trk / heads;
 520         beghead = trk % heads;
 521         endcyl = totrk / heads;
 522         endhead = totrk % heads;
 523
 524         /* check for sequential prestage - enhance cylinder range */
 525         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
 526             dedata->attributes.operation == DASD_SEQ_ACCESS) {
 527
 528                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
 529                         endcyl += basepriv->attrib.nr_cyl;
 530                 else
 531                         endcyl = (basepriv->real_cyl - 1);
 532         }
 533
 534         set_ch_t(&dedata->beg_ext, begcyl, beghead);
 535         set_ch_t(&dedata->end_ext, endcyl, endhead);
 536
 537         if (format == 1) {
 538                 fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
 539                               basedev, blksize, tlf);
 540         }
 541
 542         return rc;
 543 }
 544
 545 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 546                   unsigned int trk, unsigned int totrk, int cmd,
 547                   struct dasd_device *basedev, struct dasd_device *startdev)
 548 {
 549         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
 550                           0, 0, 0, 0, 0);
 551 }
 552
 553 static void
 554 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
 555               unsigned int rec_on_trk, int no_rec, int cmd,
 556               struct dasd_device * device, int reclen)
 557 {
 558         struct dasd_eckd_private *private;
 559         int sector;
 560         int dn, d;
 561
 562         private = (struct dasd_eckd_private *) device->private;
 563
 564         DBF_DEV_EVENT(DBF_INFO, device,
 565                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 566                   trk, rec_on_trk, no_rec, cmd, reclen);
 567
 568         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 569         ccw->flags = 0;
 570         ccw->count = 16;
 571         ccw->cda = (__u32) __pa(data);
 572
 573         memset(data, 0, sizeof(struct LO_eckd_data));
 574         sector = 0;
 575         if (rec_on_trk) {
 576                 switch (private->rdc_data.dev_type) {
 577                 case 0x3390:
 578                         dn = ceil_quot(reclen + 6, 232);
 579                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 580                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 581                         break;
 582                 case 0x3380:
 583                         d = 7 + ceil_quot(reclen + 12, 32);
 584                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 585                         break;
 586                 }
 587         }
 588         data->sector = sector;
 589         data->count = no_rec;
 590         switch (cmd) {
 591         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 592                 data->operation.orientation = 0x3;
 593                 data->operation.operation = 0x03;
 594                 break;
 595         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 596                 data->operation.orientation = 0x3;
 597                 data->operation.operation = 0x16;
 598                 break;
 599         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 600                 data->operation.orientation = 0x1;
 601                 data->operation.operation = 0x03;
 602                 data->count++;
 603                 break;
 604         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 605                 data->operation.orientation = 0x3;
 606                 data->operation.operation = 0x16;
 607                 data->count++;
 608                 break;
 609         case DASD_ECKD_CCW_WRITE:
 610         case DASD_ECKD_CCW_WRITE_MT:
 611         case DASD_ECKD_CCW_WRITE_KD:
 612         case DASD_ECKD_CCW_WRITE_KD_MT:
 613                 data->auxiliary.last_bytes_used = 0x1;
 614                 data->length = reclen;
 615                 data->operation.operation = 0x01;
 616                 break;
 617         case DASD_ECKD_CCW_WRITE_CKD:
 618         case DASD_ECKD_CCW_WRITE_CKD_MT:
 619                 data->auxiliary.last_bytes_used = 0x1;
 620                 data->length = reclen;
 621                 data->operation.operation = 0x03;
 622                 break;
 623         case DASD_ECKD_CCW_READ:
 624         case DASD_ECKD_CCW_READ_MT:
 625         case DASD_ECKD_CCW_READ_KD:
 626         case DASD_ECKD_CCW_READ_KD_MT:
 627                 data->auxiliary.last_bytes_used = 0x1;
 628                 data->length = reclen;
 629                 data->operation.operation = 0x06;
 630                 break;
 631         case DASD_ECKD_CCW_READ_CKD:
 632         case DASD_ECKD_CCW_READ_CKD_MT:
 633                 data->auxiliary.last_bytes_used = 0x1;
 634                 data->length = reclen;
 635                 data->operation.operation = 0x16;
 636                 break;
 637         case DASD_ECKD_CCW_READ_COUNT:
 638                 data->operation.operation = 0x06;
 639                 break;
 640         case DASD_ECKD_CCW_ERASE:
 641                 data->length = reclen;
 642                 data->auxiliary.last_bytes_used = 0x1;
 643                 data->operation.operation = 0x0b;
 644                 break;
 645         default:
 646                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
 647                               "opcode 0x%x", cmd);
 648         }
 649         set_ch_t(&data->seek_addr,
 650                  trk / private->rdc_data.trk_per_cyl,
 651                  trk % private->rdc_data.trk_per_cyl);
 652         data->search_arg.cyl = data->seek_addr.cyl;
 653         data->search_arg.head = data->seek_addr.head;
 654         data->search_arg.record = rec_on_trk;
 655 }
 656
 657 /*
 658  * Returns 1 if the block is one of the special blocks that needs
 659  * to get read/written with the KD variant of the command.
 660  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 661  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 662  * Luckily the KD variants differ only by one bit (0x08) from the
 663  * normal variant. So don't wonder about code like:
 664  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 665  *         ccw->cmd_code |= 0x8;
 666  */
 667 static inline int
 668 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 669 {
 670         if (recid < 3)
 671                 return 1;
 672         if (recid < blk_per_trk)
 673                 return 0;
 674         if (recid < 2 * blk_per_trk)
 675                 return 1;
 676         return 0;
 677 }
 678
 679 /*
 680  * Returns the record size for the special blocks of the cdl format.
 681  * Only returns something useful if dasd_eckd_cdl_special is true
 682  * for the recid.
 683  */
 684 static inline int
 685 dasd_eckd_cdl_reclen(int recid)
 686 {
 687         if (recid < 3)
 688                 return sizes_trk0[recid];
 689         return LABEL_SIZE;
 690 }
 691
 692 /*
 693  * Generate device unique id that specifies the physical device.
 694  */
 695 static int dasd_eckd_generate_uid(struct dasd_device *device,
 696                                   struct dasd_uid *uid)
 697 {
 698         struct dasd_eckd_private *private;
 699         int count;
 700
 701         private = (struct dasd_eckd_private *) device->private;
 702         if (!private)
 703                 return -ENODEV;
 704         if (!private->ned || !private->gneq)
 705                 return -ENODEV;
 706
 707         memset(uid, 0, sizeof(struct dasd_uid));
 708         memcpy(uid->vendor, private->ned->HDA_manufacturer,
 709                sizeof(uid->vendor) - 1);
 710         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 711         memcpy(uid->serial, private->ned->HDA_location,
 712                sizeof(uid->serial) - 1);
 713         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 714         uid->ssid = private->gneq->subsystemID;
 715         uid->real_unit_addr = private->ned->unit_addr;
 716         if (private->sneq) {
 717                 uid->type = private->sneq->sua_flags;
 718                 if (uid->type == UA_BASE_PAV_ALIAS)
 719                         uid->base_unit_addr = private->sneq->base_unit_addr;
 720         } else {
 721                 uid->type = UA_BASE_DEVICE;
 722         }
 723         if (private->vdsneq) {
 724                 for (count = 0; count < 16; count++) {
 725                         sprintf(uid->vduit+2*count, "%02x",
 726                                 private->vdsneq->uit[count]);
 727                 }
 728         }
 729         return 0;
 730 }
 731
 732 static struct dasd_ccw_req *dasd_eckd_build_rcd_lpm(struct dasd_device *device,
 733                                                     void *rcd_buffer,
 734                                                     struct ciw *ciw, __u8 lpm)
 735 {
 736         struct dasd_ccw_req *cqr;
 737         struct ccw1 *ccw;
 738
 739         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */, ciw->count,
 740                                    device);
 741
 742         if (IS_ERR(cqr)) {
 743                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 744                               "Could not allocate RCD request");
 745                 return cqr;
 746         }
 747
 748         ccw = cqr->cpaddr;
 749         ccw->cmd_code = ciw->cmd;
 750         ccw->cda = (__u32)(addr_t)rcd_buffer;
 751         ccw->count = ciw->count;
 752
 753         cqr->startdev = device;
 754         cqr->memdev = device;
 755         cqr->block = NULL;
 756         cqr->expires = 10*HZ;
 757         cqr->lpm = lpm;
 758         cqr->retries = 256;
 759         cqr->buildclk = get_clock();
 760         cqr->status = DASD_CQR_FILLED;
 761         return cqr;
 762 }
 763
 764 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 765                                    void **rcd_buffer,
 766                                    int *rcd_buffer_size, __u8 lpm)
 767 {
 768         struct ciw *ciw;
 769         char *rcd_buf = NULL;
 770         int ret;
 771         struct dasd_ccw_req *cqr;
 772
 773         /*
 774          * scan for RCD command in extended SenseID data
 775          */
 776         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 777         if (!ciw || ciw->cmd == 0) {
 778                 ret = -EOPNOTSUPP;
 779                 goto out_error;
 780         }
 781         rcd_buf = kzalloc(ciw->count, GFP_KERNEL | GFP_DMA);
 782         if (!rcd_buf) {
 783                 ret = -ENOMEM;
 784                 goto out_error;
 785         }
 786
 787         /*
 788          * buffer has to start with EBCDIC "V1.0" to show
 789          * support for virtual device SNEQ
 790          */
 791         rcd_buf[0] = 0xE5;
 792         rcd_buf[1] = 0xF1;
 793         rcd_buf[2] = 0x4B;
 794         rcd_buf[3] = 0xF0;
 795         cqr = dasd_eckd_build_rcd_lpm(device, rcd_buf, ciw, lpm);
 796         if (IS_ERR(cqr)) {
 797                 ret =  PTR_ERR(cqr);
 798                 goto out_error;
 799         }
 800         ret = dasd_sleep_on(cqr);
 801         /*
 802          * on success we update the user input parms
 803          */
 804         dasd_sfree_request(cqr, cqr->memdev);
 805         if (ret)
 806                 goto out_error;
 807
 808         *rcd_buffer_size = ciw->count;
 809         *rcd_buffer = rcd_buf;
 810         return 0;
 811 out_error:
 812         kfree(rcd_buf);
 813         *rcd_buffer = NULL;
 814         *rcd_buffer_size = 0;
 815         return ret;
 816 }
 817
 818 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
 819 {
 820
 821         struct dasd_sneq *sneq;
 822         int i, count;
 823
 824         private->ned = NULL;
 825         private->sneq = NULL;
 826         private->vdsneq = NULL;
 827         private->gneq = NULL;
 828         count = private->conf_len / sizeof(struct dasd_sneq);
 829         sneq = (struct dasd_sneq *)private->conf_data;
 830         for (i = 0; i < count; ++i) {
 831                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 832                         private->sneq = sneq;
 833                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 834                         private->vdsneq = (struct vd_sneq *)sneq;
 835                 else if (sneq->flags.identifier == 2)
 836                         private->gneq = (struct dasd_gneq *)sneq;
 837                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 838                         private->ned = (struct dasd_ned *)sneq;
 839                 sneq++;
 840         }
 841         if (!private->ned || !private->gneq) {
 842                 private->ned = NULL;
 843                 private->sneq = NULL;
 844                 private->vdsneq = NULL;
 845                 private->gneq = NULL;
 846                 return -EINVAL;
 847         }
 848         return 0;
 849
 850 };
 851
 852 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
 853 {
 854         struct dasd_gneq *gneq;
 855         int i, count, found;
 856
 857         count = conf_len / sizeof(*gneq);
 858         gneq = (struct dasd_gneq *)conf_data;
 859         found = 0;
 860         for (i = 0; i < count; ++i) {
 861                 if (gneq->flags.identifier == 2) {
 862                         found = 1;
 863                         break;
 864                 }
 865                 gneq++;
 866         }
 867         if (found)
 868                 return ((char *)gneq)[18] & 0x07;
 869         else
 870                 return 0;
 871 }
 872
 873 static int dasd_eckd_read_conf(struct dasd_device *device)
 874 {
 875         void *conf_data;
 876         int conf_len, conf_data_saved;
 877         int rc;
 878         __u8 lpm;
 879         struct dasd_eckd_private *private;
 880         struct dasd_eckd_path *path_data;
 881
 882         private = (struct dasd_eckd_private *) device->private;
 883         path_data = (struct dasd_eckd_path *) &private->path_data;
 884         path_data->opm = ccw_device_get_path_mask(device->cdev);
 885         lpm = 0x80;
 886         conf_data_saved = 0;
 887         /* get configuration data per operational path */
 888         for (lpm = 0x80; lpm; lpm>>= 1) {
 889                 if (lpm & path_data->opm){
 890                         rc = dasd_eckd_read_conf_lpm(device, &conf_data,
 891                                                      &conf_len, lpm);
 892                         if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
 893                                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
 894                                           "Read configuration data returned "
 895                                           "error %d", rc);
 896                                 return rc;
 897                         }
 898                         if (conf_data == NULL) {
 899                                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
 900                                                 "No configuration data "
 901                                                 "retrieved");
 902                                 continue;       /* no error */
 903                         }
 904                         /* save first valid configuration data */
 905                         if (!conf_data_saved) {
 906                                 kfree(private->conf_data);
 907                                 private->conf_data = conf_data;
 908                                 private->conf_len = conf_len;
 909                                 if (dasd_eckd_identify_conf_parts(private)) {
 910                                         private->conf_data = NULL;
 911                                         private->conf_len = 0;
 912                                         kfree(conf_data);
 913                                         continue;
 914                                 }
 915                                 conf_data_saved++;
 916                         }
 917                         switch (dasd_eckd_path_access(conf_data, conf_len)) {
 918                         case 0x02:
 919                                 path_data->npm |= lpm;
 920                                 break;
 921                         case 0x03:
 922                                 path_data->ppm |= lpm;
 923                                 break;
 924                         }
 925                         if (conf_data != private->conf_data)
 926                                 kfree(conf_data);
 927                 }
 928         }
 929         return 0;
 930 }
 931
 932 static int dasd_eckd_read_features(struct dasd_device *device)
 933 {
 934         struct dasd_psf_prssd_data *prssdp;
 935         struct dasd_rssd_features *features;
 936         struct dasd_ccw_req *cqr;
 937         struct ccw1 *ccw;
 938         int rc;
 939         struct dasd_eckd_private *private;
 940
 941         private = (struct dasd_eckd_private *) device->private;
 942         memset(&private->features, 0, sizeof(struct dasd_rssd_features));
 943         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
 944                                    (sizeof(struct dasd_psf_prssd_data) +
 945                                     sizeof(struct dasd_rssd_features)),
 946                                    device);
 947         if (IS_ERR(cqr)) {
 948                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
 949                                 "allocate initialization request");
 950                 return PTR_ERR(cqr);
 951         }
 952         cqr->startdev = device;
 953         cqr->memdev = device;
 954         cqr->block = NULL;
 955         cqr->retries = 256;
 956         cqr->expires = 10 * HZ;
 957
 958         /* Prepare for Read Subsystem Data */
 959         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
 960         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
 961         prssdp->order = PSF_ORDER_PRSSD;
 962         prssdp->suborder = 0x41;        /* Read Feature Codes */
 963         /* all other bytes of prssdp must be zero */
 964
 965         ccw = cqr->cpaddr;
 966         ccw->cmd_code = DASD_ECKD_CCW_PSF;
 967         ccw->count = sizeof(struct dasd_psf_prssd_data);
 968         ccw->flags |= CCW_FLAG_CC;
 969         ccw->cda = (__u32)(addr_t) prssdp;
 970
 971         /* Read Subsystem Data - feature codes */
 972         features = (struct dasd_rssd_features *) (prssdp + 1);
 973         memset(features, 0, sizeof(struct dasd_rssd_features));
 974
 975         ccw++;
 976         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
 977         ccw->count = sizeof(struct dasd_rssd_features);
 978         ccw->cda = (__u32)(addr_t) features;
 979
 980         cqr->buildclk = get_clock();
 981         cqr->status = DASD_CQR_FILLED;
 982         rc = dasd_sleep_on(cqr);
 983         if (rc == 0) {
 984                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
 985                 features = (struct dasd_rssd_features *) (prssdp + 1);
 986                 memcpy(&private->features, features,
 987                        sizeof(struct dasd_rssd_features));
 988         } else
 989                 dev_warn(&device->cdev->dev, "Reading device feature codes"
 990                          " failed with rc=%d\n", rc);
 991         dasd_sfree_request(cqr, cqr->memdev);
 992         return rc;
 993 }
 994
 995
 996 /*
 997  * Build CP for Perform Subsystem Function - SSC.
 998  */
 999 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1000                                                     int enable_pav)
1001 {
1002         struct dasd_ccw_req *cqr;
1003         struct dasd_psf_ssc_data *psf_ssc_data;
1004         struct ccw1 *ccw;
1005
1006         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1007                                   sizeof(struct dasd_psf_ssc_data),
1008                                   device);
1009
1010         if (IS_ERR(cqr)) {
1011                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1012                            "Could not allocate PSF-SSC request");
1013                 return cqr;
1014         }
1015         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1016         psf_ssc_data->order = PSF_ORDER_SSC;
1017         psf_ssc_data->suborder = 0xc0;
1018         if (enable_pav) {
1019                 psf_ssc_data->suborder |= 0x08;
1020                 psf_ssc_data->reserved[0] = 0x88;
1021         }
1022         ccw = cqr->cpaddr;
1023         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1024         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1025         ccw->count = 66;
1026
1027         cqr->startdev = device;
1028         cqr->memdev = device;
1029         cqr->block = NULL;
1030         cqr->retries = 256;
1031         cqr->expires = 10*HZ;
1032         cqr->buildclk = get_clock();
1033         cqr->status = DASD_CQR_FILLED;
1034         return cqr;
1035 }
1036
1037 /*
1038  * Perform Subsystem Function.
1039  * It is necessary to trigger CIO for channel revalidation since this
1040  * call might change behaviour of DASD devices.
1041  */
1042 static int
1043 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav)
1044 {
1045         struct dasd_ccw_req *cqr;
1046         int rc;
1047
1048         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1049         if (IS_ERR(cqr))
1050                 return PTR_ERR(cqr);
1051
1052         rc = dasd_sleep_on(cqr);
1053         if (!rc)
1054                 /* trigger CIO to reprobe devices */
1055                 css_schedule_reprobe();
1056         dasd_sfree_request(cqr, cqr->memdev);
1057         return rc;
1058 }
1059
1060 /*
1061  * Valide storage server of current device.
1062  */
1063 static void dasd_eckd_validate_server(struct dasd_device *device)
1064 {
1065         int rc;
1066         struct dasd_eckd_private *private;
1067         int enable_pav;
1068
1069         if (dasd_nopav || MACHINE_IS_VM)
1070                 enable_pav = 0;
1071         else
1072                 enable_pav = 1;
1073         rc = dasd_eckd_psf_ssc(device, enable_pav);
1074
1075         /* may be requested feature is not available on server,
1076          * therefore just report error and go ahead */
1077         private = (struct dasd_eckd_private *) device->private;
1078         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1079                         "returned rc=%d", private->uid.ssid, rc);
1080 }
1081
1082 /*
1083  * Check device characteristics.
1084  * If the device is accessible using ECKD discipline, the device is enabled.
1085  */
1086 static int
1087 dasd_eckd_check_characteristics(struct dasd_device *device)
1088 {
1089         struct dasd_eckd_private *private;
1090         struct dasd_block *block;
1091         int is_known, rc;
1092         int readonly;
1093
1094         if (!ccw_device_is_pathgroup(device->cdev)) {
1095                 dev_warn(&device->cdev->dev,
1096                          "A channel path group could not be established\n");
1097                 return -EIO;
1098         }
1099         if (!ccw_device_is_multipath(device->cdev)) {
1100                 dev_info(&device->cdev->dev,
1101                          "The DASD is not operating in multipath mode\n");
1102         }
1103         private = (struct dasd_eckd_private *) device->private;
1104         if (!private) {
1105                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1106                 if (!private) {
1107                         dev_warn(&device->cdev->dev,
1108                                  "Allocating memory for private DASD data "
1109                                  "failed\n");
1110                         return -ENOMEM;
1111                 }
1112                 device->private = (void *) private;
1113         } else {
1114                 memset(private, 0, sizeof(*private));
1115         }
1116         /* Invalidate status of initial analysis. */
1117         private->init_cqr_status = -1;
1118         /* Set default cache operations. */
1119         private->attrib.operation = DASD_NORMAL_CACHE;
1120         private->attrib.nr_cyl = 0;
1121
1122         /* Read Configuration Data */
1123         rc = dasd_eckd_read_conf(device);
1124         if (rc)
1125                 goto out_err1;
1126
1127         /* Generate device unique id and register in devmap */
1128         rc = dasd_eckd_generate_uid(device, &private->uid);
1129         if (rc)
1130                 goto out_err1;
1131         dasd_set_uid(device->cdev, &private->uid);
1132
1133         if (private->uid.type == UA_BASE_DEVICE) {
1134                 block = dasd_alloc_block();
1135                 if (IS_ERR(block)) {
1136                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1137                                         "could not allocate dasd "
1138                                         "block structure");
1139                         rc = PTR_ERR(block);
1140                         goto out_err1;
1141                 }
1142                 device->block = block;
1143                 block->base = device;
1144         }
1145
1146         /* register lcu with alias handling, enable PAV if this is a new lcu */
1147         is_known = dasd_alias_make_device_known_to_lcu(device);
1148         if (is_known < 0) {
1149                 rc = is_known;
1150                 goto out_err2;
1151         }
1152         /*
1153          * dasd_eckd_vaildate_server is done on the first device that
1154          * is found for an LCU. All later other devices have to wait
1155          * for it, so they will read the correct feature codes.
1156          */
1157         if (!is_known) {
1158                 dasd_eckd_validate_server(device);
1159                 dasd_alias_lcu_setup_complete(device);
1160         } else
1161                 dasd_alias_wait_for_lcu_setup(device);
1162
1163         /* device may report different configuration data after LCU setup */
1164         rc = dasd_eckd_read_conf(device);
1165         if (rc)
1166                 goto out_err3;
1167
1168         /* Read Feature Codes */
1169         dasd_eckd_read_features(device);
1170
1171         /* Read Device Characteristics */
1172         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1173                                          &private->rdc_data, 64);
1174         if (rc) {
1175                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1176                                 "Read device characteristic failed, rc=%d", rc);
1177                 goto out_err3;
1178         }
1179         /* find the vaild cylinder size */
1180         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1181             private->rdc_data.long_no_cyl)
1182                 private->real_cyl = private->rdc_data.long_no_cyl;
1183         else
1184                 private->real_cyl = private->rdc_data.no_cyl;
1185
1186         readonly = dasd_device_is_ro(device);
1187         if (readonly)
1188                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1189
1190         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1191                  "with %d cylinders, %d heads, %d sectors%s\n",
1192                  private->rdc_data.dev_type,
1193                  private->rdc_data.dev_model,
1194                  private->rdc_data.cu_type,
1195                  private->rdc_data.cu_model.model,
1196                  private->real_cyl,
1197                  private->rdc_data.trk_per_cyl,
1198                  private->rdc_data.sec_per_trk,
1199                  readonly ? ", read-only device" : "");
1200         return 0;
1201
1202 out_err3:
1203         dasd_alias_disconnect_device_from_lcu(device);
1204 out_err2:
1205         dasd_free_block(device->block);
1206         device->block = NULL;
1207 out_err1:
1208         kfree(private->conf_data);
1209         kfree(device->private);
1210         device->private = NULL;
1211         return rc;
1212 }
1213
1214 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1215 {
1216         struct dasd_eckd_private *private;
1217
1218         private = (struct dasd_eckd_private *) device->private;
1219         dasd_alias_disconnect_device_from_lcu(device);
1220         private->ned = NULL;
1221         private->sneq = NULL;
1222         private->vdsneq = NULL;
1223         private->gneq = NULL;
1224         private->conf_len = 0;
1225         kfree(private->conf_data);
1226         private->conf_data = NULL;
1227 }
1228
1229 static struct dasd_ccw_req *
1230 dasd_eckd_analysis_ccw(struct dasd_device *device)
1231 {
1232         struct dasd_eckd_private *private;
1233         struct eckd_count *count_data;
1234         struct LO_eckd_data *LO_data;
1235         struct dasd_ccw_req *cqr;
1236         struct ccw1 *ccw;
1237         int cplength, datasize;
1238         int i;
1239
1240         private = (struct dasd_eckd_private *) device->private;
1241
1242         cplength = 8;
1243         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1244         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1245         if (IS_ERR(cqr))
1246                 return cqr;
1247         ccw = cqr->cpaddr;
1248         /* Define extent for the first 3 tracks. */
1249         define_extent(ccw++, cqr->data, 0, 2,
1250                       DASD_ECKD_CCW_READ_COUNT, device);
1251         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1252         /* Locate record for the first 4 records on track 0. */
1253         ccw[-1].flags |= CCW_FLAG_CC;
1254         locate_record(ccw++, LO_data++, 0, 0, 4,
1255                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1256
1257         count_data = private->count_area;
1258         for (i = 0; i < 4; i++) {
1259                 ccw[-1].flags |= CCW_FLAG_CC;
1260                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1261                 ccw->flags = 0;
1262                 ccw->count = 8;
1263                 ccw->cda = (__u32)(addr_t) count_data;
1264                 ccw++;
1265                 count_data++;
1266         }
1267
1268         /* Locate record for the first record on track 2. */
1269         ccw[-1].flags |= CCW_FLAG_CC;
1270         locate_record(ccw++, LO_data++, 2, 0, 1,
1271                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1272         /* Read count ccw. */
1273         ccw[-1].flags |= CCW_FLAG_CC;
1274         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1275         ccw->flags = 0;
1276         ccw->count = 8;
1277         ccw->cda = (__u32)(addr_t) count_data;
1278
1279         cqr->block = NULL;
1280         cqr->startdev = device;
1281         cqr->memdev = device;
1282         cqr->retries = 255;
1283         cqr->buildclk = get_clock();
1284         cqr->status = DASD_CQR_FILLED;
1285         return cqr;
1286 }
1287
1288 /* differentiate between 'no record found' and any other error */
1289 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1290 {
1291         char *sense;
1292         if (init_cqr->status == DASD_CQR_DONE)
1293                 return INIT_CQR_OK;
1294         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1295                  init_cqr->status == DASD_CQR_FAILED) {
1296                 sense = dasd_get_sense(&init_cqr->irb);
1297                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1298                         return INIT_CQR_UNFORMATTED;
1299                 else
1300                         return INIT_CQR_ERROR;
1301         } else
1302                 return INIT_CQR_ERROR;
1303 }
1304
1305 /*
1306  * This is the callback function for the init_analysis cqr. It saves
1307  * the status of the initial analysis ccw before it frees it and kicks
1308  * the device to continue the startup sequence. This will call
1309  * dasd_eckd_do_analysis again (if the devices has not been marked
1310  * for deletion in the meantime).
1311  */
1312 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1313                                         void *data)
1314 {
1315         struct dasd_eckd_private *private;
1316         struct dasd_device *device;
1317
1318         device = init_cqr->startdev;
1319         private = (struct dasd_eckd_private *) device->private;
1320         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1321         dasd_sfree_request(init_cqr, device);
1322         dasd_kick_device(device);
1323 }
1324
1325 static int dasd_eckd_start_analysis(struct dasd_block *block)
1326 {
1327         struct dasd_eckd_private *private;
1328         struct dasd_ccw_req *init_cqr;
1329
1330         private = (struct dasd_eckd_private *) block->base->private;
1331         init_cqr = dasd_eckd_analysis_ccw(block->base);
1332         if (IS_ERR(init_cqr))
1333                 return PTR_ERR(init_cqr);
1334         init_cqr->callback = dasd_eckd_analysis_callback;
1335         init_cqr->callback_data = NULL;
1336         init_cqr->expires = 5*HZ;
1337         /* first try without ERP, so we can later handle unformatted
1338          * devices as special case
1339          */
1340         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1341         init_cqr->retries = 0;
1342         dasd_add_request_head(init_cqr);
1343         return -EAGAIN;
1344 }
1345
1346 static int dasd_eckd_end_analysis(struct dasd_block *block)
1347 {
1348         struct dasd_device *device;
1349         struct dasd_eckd_private *private;
1350         struct eckd_count *count_area;
1351         unsigned int sb, blk_per_trk;
1352         int status, i;
1353         struct dasd_ccw_req *init_cqr;
1354
1355         device = block->base;
1356         private = (struct dasd_eckd_private *) device->private;
1357         status = private->init_cqr_status;
1358         private->init_cqr_status = -1;
1359         if (status == INIT_CQR_ERROR) {
1360                 /* try again, this time with full ERP */
1361                 init_cqr = dasd_eckd_analysis_ccw(device);
1362                 dasd_sleep_on(init_cqr);
1363                 status = dasd_eckd_analysis_evaluation(init_cqr);
1364                 dasd_sfree_request(init_cqr, device);
1365         }
1366
1367         if (status == INIT_CQR_UNFORMATTED) {
1368                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1369                 return -EMEDIUMTYPE;
1370         } else if (status == INIT_CQR_ERROR) {
1371                 dev_err(&device->cdev->dev,
1372                         "Detecting the DASD disk layout failed because "
1373                         "of an I/O error\n");
1374                 return -EIO;
1375         }
1376
1377         private->uses_cdl = 1;
1378         /* Check Track 0 for Compatible Disk Layout */
1379         count_area = NULL;
1380         for (i = 0; i < 3; i++) {
1381                 if (private->count_area[i].kl != 4 ||
1382                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
1383                         private->uses_cdl = 0;
1384                         break;
1385                 }
1386         }
1387         if (i == 3)
1388                 count_area = &private->count_area[4];
1389
1390         if (private->uses_cdl == 0) {
1391                 for (i = 0; i < 5; i++) {
1392                         if ((private->count_area[i].kl != 0) ||
1393                             (private->count_area[i].dl !=
1394                              private->count_area[0].dl))
1395                                 break;
1396                 }
1397                 if (i == 5)
1398                         count_area = &private->count_area[0];
1399         } else {
1400                 if (private->count_area[3].record == 1)
1401                         dev_warn(&device->cdev->dev,
1402                                  "Track 0 has no records following the VTOC\n");
1403         }
1404         if (count_area != NULL && count_area->kl == 0) {
1405                 /* we found notthing violating our disk layout */
1406                 if (dasd_check_blocksize(count_area->dl) == 0)
1407                         block->bp_block = count_area->dl;
1408         }
1409         if (block->bp_block == 0) {
1410                 dev_warn(&device->cdev->dev,
1411                          "The disk layout of the DASD is not supported\n");
1412                 return -EMEDIUMTYPE;
1413         }
1414         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1415         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1416                 block->s2b_shift++;
1417
1418         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1419         block->blocks = (private->real_cyl *
1420                           private->rdc_data.trk_per_cyl *
1421                           blk_per_trk);
1422
1423         dev_info(&device->cdev->dev,
1424                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
1425                  "%s\n", (block->bp_block >> 10),
1426                  ((private->real_cyl *
1427                    private->rdc_data.trk_per_cyl *
1428                    blk_per_trk * (block->bp_block >> 9)) >> 1),
1429                  ((blk_per_trk * block->bp_block) >> 10),
1430                  private->uses_cdl ?
1431                  "compatible disk layout" : "linux disk layout");
1432
1433         return 0;
1434 }
1435
1436 static int dasd_eckd_do_analysis(struct dasd_block *block)
1437 {
1438         struct dasd_eckd_private *private;
1439
1440         private = (struct dasd_eckd_private *) block->base->private;
1441         if (private->init_cqr_status < 0)
1442                 return dasd_eckd_start_analysis(block);
1443         else
1444                 return dasd_eckd_end_analysis(block);
1445 }
1446
1447 static int dasd_eckd_ready_to_online(struct dasd_device *device)
1448 {
1449         return dasd_alias_add_device(device);
1450 };
1451
1452 static int dasd_eckd_online_to_ready(struct dasd_device *device)
1453 {
1454         return dasd_alias_remove_device(device);
1455 };
1456
1457 static int
1458 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
1459 {
1460         struct dasd_eckd_private *private;
1461
1462         private = (struct dasd_eckd_private *) block->base->private;
1463         if (dasd_check_blocksize(block->bp_block) == 0) {
1464                 geo->sectors = recs_per_track(&private->rdc_data,
1465                                               0, block->bp_block);
1466         }
1467         geo->cylinders = private->rdc_data.no_cyl;
1468         geo->heads = private->rdc_data.trk_per_cyl;
1469         return 0;
1470 }
1471
1472 static struct dasd_ccw_req *
1473 dasd_eckd_format_device(struct dasd_device * device,
1474                         struct format_data_t * fdata)
1475 {
1476         struct dasd_eckd_private *private;
1477         struct dasd_ccw_req *fcp;
1478         struct eckd_count *ect;
1479         struct ccw1 *ccw;
1480         void *data;
1481         int rpt;
1482         struct ch_t address;
1483         int cplength, datasize;
1484         int i;
1485         int intensity = 0;
1486         int r0_perm;
1487
1488         private = (struct dasd_eckd_private *) device->private;
1489         rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
1490         set_ch_t(&address,
1491                  fdata->start_unit / private->rdc_data.trk_per_cyl,
1492                  fdata->start_unit % private->rdc_data.trk_per_cyl);
1493
1494         /* Sanity checks. */
1495         if (fdata->start_unit >=
1496             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
1497                 dev_warn(&device->cdev->dev, "Start track number %d used in "
1498                          "formatting is too big\n", fdata->start_unit);
1499                 return ERR_PTR(-EINVAL);
1500         }
1501         if (fdata->start_unit > fdata->stop_unit) {
1502                 dev_warn(&device->cdev->dev, "Start track %d used in "
1503                          "formatting exceeds end track\n", fdata->start_unit);
1504                 return ERR_PTR(-EINVAL);
1505         }
1506         if (dasd_check_blocksize(fdata->blksize) != 0) {
1507                 dev_warn(&device->cdev->dev,
1508                          "The DASD cannot be formatted with block size %d\n",
1509                          fdata->blksize);
1510                 return ERR_PTR(-EINVAL);
1511         }
1512
1513         /*
1514          * fdata->intensity is a bit string that tells us what to do:
1515          *   Bit 0: write record zero
1516          *   Bit 1: write home address, currently not supported
1517          *   Bit 2: invalidate tracks
1518          *   Bit 3: use OS/390 compatible disk layout (cdl)
1519          *   Bit 4: do not allow storage subsystem to modify record zero
1520          * Only some bit combinations do make sense.
1521          */
1522         if (fdata->intensity & 0x10) {
1523                 r0_perm = 0;
1524                 intensity = fdata->intensity & ~0x10;
1525         } else {
1526                 r0_perm = 1;
1527                 intensity = fdata->intensity;
1528         }
1529         switch (intensity) {
1530         case 0x00:      /* Normal format */
1531         case 0x08:      /* Normal format, use cdl. */
1532                 cplength = 2 + rpt;
1533                 datasize = sizeof(struct DE_eckd_data) +
1534                         sizeof(struct LO_eckd_data) +
1535                         rpt * sizeof(struct eckd_count);
1536                 break;
1537         case 0x01:      /* Write record zero and format track. */
1538         case 0x09:      /* Write record zero and format track, use cdl. */
1539                 cplength = 3 + rpt;
1540                 datasize = sizeof(struct DE_eckd_data) +
1541                         sizeof(struct LO_eckd_data) +
1542                         sizeof(struct eckd_count) +
1543                         rpt * sizeof(struct eckd_count);
1544                 break;
1545         case 0x04:      /* Invalidate track. */
1546         case 0x0c:      /* Invalidate track, use cdl. */
1547                 cplength = 3;
1548                 datasize = sizeof(struct DE_eckd_data) +
1549                         sizeof(struct LO_eckd_data) +
1550                         sizeof(struct eckd_count);
1551                 break;
1552         default:
1553                 dev_warn(&device->cdev->dev, "An I/O control call used "
1554                          "incorrect flags 0x%x\n", fdata->intensity);
1555                 return ERR_PTR(-EINVAL);
1556         }
1557         /* Allocate the format ccw request. */
1558         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1559         if (IS_ERR(fcp))
1560                 return fcp;
1561
1562         data = fcp->data;
1563         ccw = fcp->cpaddr;
1564
1565         switch (intensity & ~0x08) {
1566         case 0x00: /* Normal format. */
1567                 define_extent(ccw++, (struct DE_eckd_data *) data,
1568                               fdata->start_unit, fdata->start_unit,
1569                               DASD_ECKD_CCW_WRITE_CKD, device);
1570                 /* grant subsystem permission to format R0 */
1571                 if (r0_perm)
1572                         ((struct DE_eckd_data *)data)->ga_extended |= 0x04;
1573                 data += sizeof(struct DE_eckd_data);
1574                 ccw[-1].flags |= CCW_FLAG_CC;
1575                 locate_record(ccw++, (struct LO_eckd_data *) data,
1576                               fdata->start_unit, 0, rpt,
1577                               DASD_ECKD_CCW_WRITE_CKD, device,
1578                               fdata->blksize);
1579                 data += sizeof(struct LO_eckd_data);
1580                 break;
1581         case 0x01: /* Write record zero + format track. */
1582                 define_extent(ccw++, (struct DE_eckd_data *) data,
1583                               fdata->start_unit, fdata->start_unit,
1584                               DASD_ECKD_CCW_WRITE_RECORD_ZERO,
1585                               device);
1586                 data += sizeof(struct DE_eckd_data);
1587                 ccw[-1].flags |= CCW_FLAG_CC;
1588                 locate_record(ccw++, (struct LO_eckd_data *) data,
1589                               fdata->start_unit, 0, rpt + 1,
1590                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
1591                               device->block->bp_block);
1592                 data += sizeof(struct LO_eckd_data);
1593                 break;
1594         case 0x04: /* Invalidate track. */
1595                 define_extent(ccw++, (struct DE_eckd_data *) data,
1596                               fdata->start_unit, fdata->start_unit,
1597                               DASD_ECKD_CCW_WRITE_CKD, device);
1598                 data += sizeof(struct DE_eckd_data);
1599                 ccw[-1].flags |= CCW_FLAG_CC;
1600                 locate_record(ccw++, (struct LO_eckd_data *) data,
1601                               fdata->start_unit, 0, 1,
1602                               DASD_ECKD_CCW_WRITE_CKD, device, 8);
1603                 data += sizeof(struct LO_eckd_data);
1604                 break;
1605         }
1606         if (intensity & 0x01) { /* write record zero */
1607                 ect = (struct eckd_count *) data;
1608                 data += sizeof(struct eckd_count);
1609                 ect->cyl = address.cyl;
1610                 ect->head = address.head;
1611                 ect->record = 0;
1612                 ect->kl = 0;
1613                 ect->dl = 8;
1614                 ccw[-1].flags |= CCW_FLAG_CC;
1615                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
1616                 ccw->flags = CCW_FLAG_SLI;
1617                 ccw->count = 8;
1618                 ccw->cda = (__u32)(addr_t) ect;
1619                 ccw++;
1620         }
1621         if ((intensity & ~0x08) & 0x04) {       /* erase track */
1622                 ect = (struct eckd_count *) data;
1623                 data += sizeof(struct eckd_count);
1624                 ect->cyl = address.cyl;
1625                 ect->head = address.head;
1626                 ect->record = 1;
1627                 ect->kl = 0;
1628                 ect->dl = 0;
1629                 ccw[-1].flags |= CCW_FLAG_CC;
1630                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1631                 ccw->flags = CCW_FLAG_SLI;
1632                 ccw->count = 8;
1633                 ccw->cda = (__u32)(addr_t) ect;
1634         } else {                /* write remaining records */
1635                 for (i = 0; i < rpt; i++) {
1636                         ect = (struct eckd_count *) data;
1637                         data += sizeof(struct eckd_count);
1638                         ect->cyl = address.cyl;
1639                         ect->head = address.head;
1640                         ect->record = i + 1;
1641                         ect->kl = 0;
1642                         ect->dl = fdata->blksize;
1643                         /* Check for special tracks 0-1 when formatting CDL */
1644                         if ((intensity & 0x08) &&
1645                             fdata->start_unit == 0) {
1646                                 if (i < 3) {
1647                                         ect->kl = 4;
1648                                         ect->dl = sizes_trk0[i] - 4;
1649                                 }
1650                         }
1651                         if ((intensity & 0x08) &&
1652                             fdata->start_unit == 1) {
1653                                 ect->kl = 44;
1654                                 ect->dl = LABEL_SIZE - 44;
1655                         }
1656                         ccw[-1].flags |= CCW_FLAG_CC;
1657                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1658                         ccw->flags = CCW_FLAG_SLI;
1659                         ccw->count = 8;
1660                         ccw->cda = (__u32)(addr_t) ect;
1661                         ccw++;
1662                 }
1663         }
1664         fcp->startdev = device;
1665         fcp->memdev = device;
1666         fcp->retries = 256;
1667         fcp->buildclk = get_clock();
1668         fcp->status = DASD_CQR_FILLED;
1669         return fcp;
1670 }
1671
1672 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
1673 {
1674         cqr->status = DASD_CQR_FILLED;
1675         if (cqr->block && (cqr->startdev != cqr->block->base)) {
1676                 dasd_eckd_reset_ccw_to_base_io(cqr);
1677                 cqr->startdev = cqr->block->base;
1678         }
1679 };
1680
1681 static dasd_erp_fn_t
1682 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
1683 {
1684         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
1685         struct ccw_device *cdev = device->cdev;
1686
1687         switch (cdev->id.cu_type) {
1688         case 0x3990:
1689         case 0x2105:
1690         case 0x2107:
1691         case 0x1750:
1692                 return dasd_3990_erp_action;
1693         case 0x9343:
1694         case 0x3880:
1695         default:
1696                 return dasd_default_erp_action;
1697         }
1698 }
1699
1700 static dasd_erp_fn_t
1701 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
1702 {
1703         return dasd_default_erp_postaction;
1704 }
1705
1706
1707 static void dasd_eckd_handle_unsolicited_interrupt(struct dasd_device *device,
1708                                                    struct irb *irb)
1709 {
1710         char mask;
1711         char *sense = NULL;
1712
1713         /* first of all check for state change pending interrupt */
1714         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
1715         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
1716                 dasd_generic_handle_state_change(device);
1717                 return;
1718         }
1719
1720         /* summary unit check */
1721         if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
1722             (irb->ecw[7] == 0x0D)) {
1723                 dasd_alias_handle_summary_unit_check(device, irb);
1724                 return;
1725         }
1726
1727         sense = dasd_get_sense(irb);
1728         /* service information message SIM */
1729         if (sense && !(sense[27] & DASD_SENSE_BIT_0) &&
1730             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
1731                 dasd_3990_erp_handle_sim(device, sense);
1732                 dasd_schedule_device_bh(device);
1733                 return;
1734         }
1735
1736         if ((scsw_cc(&irb->scsw) == 1) &&
1737             (scsw_fctl(&irb->scsw) & SCSW_FCTL_START_FUNC) &&
1738             (scsw_actl(&irb->scsw) & SCSW_ACTL_START_PEND) &&
1739             (scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND)) {
1740                 /* fake irb do nothing, they are handled elsewhere */
1741                 dasd_schedule_device_bh(device);
1742                 return;
1743         }
1744
1745         if (!sense) {
1746                 /* just report other unsolicited interrupts */
1747                 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1748                             "unsolicited interrupt received");
1749         } else {
1750                 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1751                             "unsolicited interrupt received "
1752                             "(sense available)");
1753                 device->discipline->dump_sense_dbf(device, irb, "unsolicited");
1754         }
1755
1756         dasd_schedule_device_bh(device);
1757         return;
1758 };
1759
1760
1761 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
1762                                                struct dasd_device *startdev,
1763                                                struct dasd_block *block,
1764                                                struct request *req,
1765                                                sector_t first_rec,
1766                                                sector_t last_rec,
1767                                                sector_t first_trk,
1768                                                sector_t last_trk,
1769                                                unsigned int first_offs,
1770                                                unsigned int last_offs,
1771                                                unsigned int blk_per_trk,
1772                                                unsigned int blksize)
1773 {
1774         struct dasd_eckd_private *private;
1775         unsigned long *idaws;
1776         struct LO_eckd_data *LO_data;
1777         struct dasd_ccw_req *cqr;
1778         struct ccw1 *ccw;
1779         struct req_iterator iter;
1780         struct bio_vec *bv;
1781         char *dst;
1782         unsigned int off;
1783         int count, cidaw, cplength, datasize;
1784         sector_t recid;
1785         unsigned char cmd, rcmd;
1786         int use_prefix;
1787         struct dasd_device *basedev;
1788
1789         basedev = block->base;
1790         private = (struct dasd_eckd_private *) basedev->private;
1791         if (rq_data_dir(req) == READ)
1792                 cmd = DASD_ECKD_CCW_READ_MT;
1793         else if (rq_data_dir(req) == WRITE)
1794                 cmd = DASD_ECKD_CCW_WRITE_MT;
1795         else
1796                 return ERR_PTR(-EINVAL);
1797
1798         /* Check struct bio and count the number of blocks for the request. */
1799         count = 0;
1800         cidaw = 0;
1801         rq_for_each_segment(bv, req, iter) {
1802                 if (bv->bv_len & (blksize - 1))
1803                         /* Eckd can only do full blocks. */
1804                         return ERR_PTR(-EINVAL);
1805                 count += bv->bv_len >> (block->s2b_shift + 9);
1806 #if defined(CONFIG_64BIT)
1807                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
1808                         cidaw += bv->bv_len >> (block->s2b_shift + 9);
1809 #endif
1810         }
1811         /* Paranoia. */
1812         if (count != last_rec - first_rec + 1)
1813                 return ERR_PTR(-EINVAL);
1814
1815         /* use the prefix command if available */
1816         use_prefix = private->features.feature[8] & 0x01;
1817         if (use_prefix) {
1818                 /* 1x prefix + number of blocks */
1819                 cplength = 2 + count;
1820                 /* 1x prefix + cidaws*sizeof(long) */
1821                 datasize = sizeof(struct PFX_eckd_data) +
1822                         sizeof(struct LO_eckd_data) +
1823                         cidaw * sizeof(unsigned long);
1824         } else {
1825                 /* 1x define extent + 1x locate record + number of blocks */
1826                 cplength = 2 + count;
1827                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
1828                 datasize = sizeof(struct DE_eckd_data) +
1829                         sizeof(struct LO_eckd_data) +
1830                         cidaw * sizeof(unsigned long);
1831         }
1832         /* Find out the number of additional locate record ccws for cdl. */
1833         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
1834                 if (last_rec >= 2*blk_per_trk)
1835                         count = 2*blk_per_trk - first_rec;
1836                 cplength += count;
1837                 datasize += count*sizeof(struct LO_eckd_data);
1838         }
1839         /* Allocate the ccw request. */
1840         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
1841                                    startdev);
1842         if (IS_ERR(cqr))
1843                 return cqr;
1844         ccw = cqr->cpaddr;
1845         /* First ccw is define extent or prefix. */
1846         if (use_prefix) {
1847                 if (prefix(ccw++, cqr->data, first_trk,
1848                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
1849                         /* Clock not in sync and XRC is enabled.
1850                          * Try again later.
1851                          */
1852                         dasd_sfree_request(cqr, startdev);
1853                         return ERR_PTR(-EAGAIN);
1854                 }
1855                 idaws = (unsigned long *) (cqr->data +
1856                                            sizeof(struct PFX_eckd_data));
1857         } else {
1858                 if (define_extent(ccw++, cqr->data, first_trk,
1859                                   last_trk, cmd, startdev) == -EAGAIN) {
1860                         /* Clock not in sync and XRC is enabled.
1861                          * Try again later.
1862                          */
1863                         dasd_sfree_request(cqr, startdev);
1864                         return ERR_PTR(-EAGAIN);
1865                 }
1866                 idaws = (unsigned long *) (cqr->data +
1867                                            sizeof(struct DE_eckd_data));
1868         }
1869         /* Build locate_record+read/write/ccws. */
1870         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
1871         recid = first_rec;
1872         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
1873                 /* Only standard blocks so there is just one locate record. */
1874                 ccw[-1].flags |= CCW_FLAG_CC;
1875                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
1876                               last_rec - recid + 1, cmd, basedev, blksize);
1877         }
1878         rq_for_each_segment(bv, req, iter) {
1879                 dst = page_address(bv->bv_page) + bv->bv_offset;
1880                 if (dasd_page_cache) {
1881                         char *copy = kmem_cache_alloc(dasd_page_cache,
1882                                                       GFP_DMA | __GFP_NOWARN);
1883                         if (copy && rq_data_dir(req) == WRITE)
1884                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
1885                         if (copy)
1886                                 dst = copy + bv->bv_offset;
1887                 }
1888                 for (off = 0; off < bv->bv_len; off += blksize) {
1889                         sector_t trkid = recid;
1890                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
1891                         rcmd = cmd;
1892                         count = blksize;
1893                         /* Locate record for cdl special block ? */
1894                         if (private->uses_cdl && recid < 2*blk_per_trk) {
1895                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
1896                                         rcmd |= 0x8;
1897                                         count = dasd_eckd_cdl_reclen(recid);
1898                                         if (count < blksize &&
1899                                             rq_data_dir(req) == READ)
1900                                                 memset(dst + count, 0xe5,
1901                                                        blksize - count);
1902                                 }
1903                                 ccw[-1].flags |= CCW_FLAG_CC;
1904                                 locate_record(ccw++, LO_data++,
1905                                               trkid, recoffs + 1,
1906                                               1, rcmd, basedev, count);
1907                         }
1908                         /* Locate record for standard blocks ? */
1909                         if (private->uses_cdl && recid == 2*blk_per_trk) {
1910                                 ccw[-1].flags |= CCW_FLAG_CC;
1911                                 locate_record(ccw++, LO_data++,
1912                                               trkid, recoffs + 1,
1913                                               last_rec - recid + 1,
1914                                               cmd, basedev, count);
1915                         }
1916                         /* Read/write ccw. */
1917                         ccw[-1].flags |= CCW_FLAG_CC;
1918                         ccw->cmd_code = rcmd;
1919                         ccw->count = count;
1920                         if (idal_is_needed(dst, blksize)) {
1921                                 ccw->cda = (__u32)(addr_t) idaws;
1922                                 ccw->flags = CCW_FLAG_IDA;
1923                                 idaws = idal_create_words(idaws, dst, blksize);
1924                         } else {
1925                                 ccw->cda = (__u32)(addr_t) dst;
1926                                 ccw->flags = 0;
1927                         }
1928                         ccw++;
1929                         dst += blksize;
1930                         recid++;
1931                 }
1932         }
1933         if (blk_noretry_request(req) ||
1934             block->base->features & DASD_FEATURE_FAILFAST)
1935                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1936         cqr->startdev = startdev;
1937         cqr->memdev = startdev;
1938         cqr->block = block;
1939         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
1940         cqr->lpm = private->path_data.ppm;
1941         cqr->retries = 256;
1942         cqr->buildclk = get_clock();
1943         cqr->status = DASD_CQR_FILLED;
1944         return cqr;
1945 }
1946
1947 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
1948                                                struct dasd_device *startdev,
1949                                                struct dasd_block *block,
1950                                                struct request *req,
1951                                                sector_t first_rec,
1952                                                sector_t last_rec,
1953                                                sector_t first_trk,
1954                                                sector_t last_trk,
1955                                                unsigned int first_offs,
1956                                                unsigned int last_offs,
1957                                                unsigned int blk_per_trk,
1958                                                unsigned int blksize)
1959 {
1960         struct dasd_eckd_private *private;
1961         unsigned long *idaws;
1962         struct dasd_ccw_req *cqr;
1963         struct ccw1 *ccw;
1964         struct req_iterator iter;
1965         struct bio_vec *bv;
1966         char *dst, *idaw_dst;
1967         unsigned int cidaw, cplength, datasize;
1968         unsigned int tlf;
1969         sector_t recid;
1970         unsigned char cmd;
1971         struct dasd_device *basedev;
1972         unsigned int trkcount, count, count_to_trk_end;
1973         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
1974         unsigned char new_track, end_idaw;
1975         sector_t trkid;
1976         unsigned int recoffs;
1977
1978         basedev = block->base;
1979         private = (struct dasd_eckd_private *) basedev->private;
1980         if (rq_data_dir(req) == READ)
1981                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
1982         else if (rq_data_dir(req) == WRITE)
1983                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
1984         else
1985                 return ERR_PTR(-EINVAL);
1986
1987         /* Track based I/O needs IDAWs for each page, and not just for
1988          * 64 bit addresses. We need additional idals for pages
1989          * that get filled from two tracks, so we use the number
1990          * of records as upper limit.
1991          */
1992         cidaw = last_rec - first_rec + 1;
1993         trkcount = last_trk - first_trk + 1;
1994
1995         /* 1x prefix + one read/write ccw per track */
1996         cplength = 1 + trkcount;
1997
1998         /* on 31-bit we need space for two 32 bit addresses per page
1999          * on 64-bit one 64 bit address
2000          */
2001         datasize = sizeof(struct PFX_eckd_data) +
2002                 cidaw * sizeof(unsigned long long);
2003
2004         /* Allocate the ccw request. */
2005         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2006                                    startdev);
2007         if (IS_ERR(cqr))
2008                 return cqr;
2009         ccw = cqr->cpaddr;
2010         /* transfer length factor: how many bytes to read from the last track */
2011         if (first_trk == last_trk)
2012                 tlf = last_offs - first_offs + 1;
2013         else
2014                 tlf = last_offs + 1;
2015         tlf *= blksize;
2016
2017         if (prefix_LRE(ccw++, cqr->data, first_trk,
2018                        last_trk, cmd, basedev, startdev,
2019                        1 /* format */, first_offs + 1,
2020                        trkcount, blksize,
2021                        tlf) == -EAGAIN) {
2022                 /* Clock not in sync and XRC is enabled.
2023                  * Try again later.
2024                  */
2025                 dasd_sfree_request(cqr, startdev);
2026                 return ERR_PTR(-EAGAIN);
2027         }
2028
2029         /*
2030          * The translation of request into ccw programs must meet the
2031          * following conditions:
2032          * - all idaws but the first and the last must address full pages
2033          *   (or 2K blocks on 31-bit)
2034          * - the scope of a ccw and it's idal ends with the track boundaries
2035          */
2036         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2037         recid = first_rec;
2038         new_track = 1;
2039         end_idaw = 0;
2040         len_to_track_end = 0;
2041         idaw_dst = 0;
2042         idaw_len = 0;
2043         rq_for_each_segment(bv, req, iter) {
2044                 dst = page_address(bv->bv_page) + bv->bv_offset;
2045                 seg_len = bv->bv_len;
2046                 while (seg_len) {
2047                         if (new_track) {
2048                                 trkid = recid;
2049                                 recoffs = sector_div(trkid, blk_per_trk);
2050                                 count_to_trk_end = blk_per_trk - recoffs;
2051                                 count = min((last_rec - recid + 1),
2052                                             (sector_t)count_to_trk_end);
2053                                 len_to_track_end = count * blksize;
2054                                 ccw[-1].flags |= CCW_FLAG_CC;
2055                                 ccw->cmd_code = cmd;
2056                                 ccw->count = len_to_track_end;
2057                                 ccw->cda = (__u32)(addr_t)idaws;
2058                                 ccw->flags = CCW_FLAG_IDA;
2059                                 ccw++;
2060                                 recid += count;
2061                                 new_track = 0;
2062                                 /* first idaw for a ccw may start anywhere */
2063                                 if (!idaw_dst)
2064                                         idaw_dst = dst;
2065                         }
2066                         /* If we start a new idaw, we must make sure that it
2067                          * starts on an IDA_BLOCK_SIZE boundary.
2068                          * If we continue an idaw, we must make sure that the
2069                          * current segment begins where the so far accumulated
2070                          * idaw ends
2071                          */
2072                         if (!idaw_dst) {
2073                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2074                                         dasd_sfree_request(cqr, startdev);
2075                                         return ERR_PTR(-ERANGE);
2076                                 } else
2077                                         idaw_dst = dst;
2078                         }
2079                         if ((idaw_dst + idaw_len) != dst) {
2080                                 dasd_sfree_request(cqr, startdev);
2081                                 return ERR_PTR(-ERANGE);
2082                         }
2083                         part_len = min(seg_len, len_to_track_end);
2084                         seg_len -= part_len;
2085                         dst += part_len;
2086                         idaw_len += part_len;
2087                         len_to_track_end -= part_len;
2088                         /* collected memory area ends on an IDA_BLOCK border,
2089                          * -> create an idaw
2090                          * idal_create_words will handle cases where idaw_len
2091                          * is larger then IDA_BLOCK_SIZE
2092                          */
2093                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2094                                 end_idaw = 1;
2095                         /* We also need to end the idaw at track end */
2096                         if (!len_to_track_end) {
2097                                 new_track = 1;
2098                                 end_idaw = 1;
2099                         }
2100                         if (end_idaw) {
2101                                 idaws = idal_create_words(idaws, idaw_dst,
2102                                                           idaw_len);
2103                                 idaw_dst = 0;
2104                                 idaw_len = 0;
2105                                 end_idaw = 0;
2106                         }
2107                 }
2108         }
2109
2110         if (blk_noretry_request(req) ||
2111             block->base->features & DASD_FEATURE_FAILFAST)
2112                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2113         cqr->startdev = startdev;
2114         cqr->memdev = startdev;
2115         cqr->block = block;
2116         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
2117         cqr->lpm = private->path_data.ppm;
2118         cqr->retries = 256;
2119         cqr->buildclk = get_clock();
2120         cqr->status = DASD_CQR_FILLED;
2121         return cqr;
2122 }
2123
2124 static int prepare_itcw(struct itcw *itcw,
2125                         unsigned int trk, unsigned int totrk, int cmd,
2126                         struct dasd_device *basedev,
2127                         struct dasd_device *startdev,
2128                         unsigned int rec_on_trk, int count,
2129                         unsigned int blksize,
2130                         unsigned int total_data_size,
2131                         unsigned int tlf,
2132                         unsigned int blk_per_trk)
2133 {
2134         struct PFX_eckd_data pfxdata;
2135         struct dasd_eckd_private *basepriv, *startpriv;
2136         struct DE_eckd_data *dedata;
2137         struct LRE_eckd_data *lredata;
2138         struct dcw *dcw;
2139
2140         u32 begcyl, endcyl;
2141         u16 heads, beghead, endhead;
2142         u8 pfx_cmd;
2143
2144         int rc = 0;
2145         int sector = 0;
2146         int dn, d;
2147
2148
2149         /* setup prefix data */
2150         basepriv = (struct dasd_eckd_private *) basedev->private;
2151         startpriv = (struct dasd_eckd_private *) startdev->private;
2152         dedata = &pfxdata.define_extent;
2153         lredata = &pfxdata.locate_record;
2154
2155         memset(&pfxdata, 0, sizeof(pfxdata));
2156         pfxdata.format = 1; /* PFX with LRE */
2157         pfxdata.base_address = basepriv->ned->unit_addr;
2158         pfxdata.base_lss = basepriv->ned->ID;
2159         pfxdata.validity.define_extent = 1;
2160
2161         /* private uid is kept up to date, conf_data may be outdated */
2162         if (startpriv->uid.type != UA_BASE_DEVICE) {
2163                 pfxdata.validity.verify_base = 1;
2164                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2165                         pfxdata.validity.hyper_pav = 1;
2166         }
2167
2168         switch (cmd) {
2169         case DASD_ECKD_CCW_READ_TRACK_DATA:
2170                 dedata->mask.perm = 0x1;
2171                 dedata->attributes.operation = basepriv->attrib.operation;
2172                 dedata->blk_size = blksize;
2173                 dedata->ga_extended |= 0x42;
2174                 lredata->operation.orientation = 0x0;
2175                 lredata->operation.operation = 0x0C;
2176                 lredata->auxiliary.check_bytes = 0x01;
2177                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2178                 break;
2179         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2180                 dedata->mask.perm = 0x02;
2181                 dedata->attributes.operation = basepriv->attrib.operation;
2182                 dedata->blk_size = blksize;
2183                 rc = check_XRC_on_prefix(&pfxdata, basedev);
2184                 dedata->ga_extended |= 0x42;
2185                 lredata->operation.orientation = 0x0;
2186                 lredata->operation.operation = 0x3F;
2187                 lredata->extended_operation = 0x23;
2188                 lredata->auxiliary.check_bytes = 0x2;
2189                 pfx_cmd = DASD_ECKD_CCW_PFX;
2190                 break;
2191         default:
2192                 DBF_DEV_EVENT(DBF_ERR, basedev,
2193                               "prepare itcw, unknown opcode 0x%x", cmd);
2194                 BUG();
2195                 break;
2196         }
2197         if (rc)
2198                 return rc;
2199
2200         dedata->attributes.mode = 0x3;  /* ECKD */
2201
2202         heads = basepriv->rdc_data.trk_per_cyl;
2203         begcyl = trk / heads;
2204         beghead = trk % heads;
2205         endcyl = totrk / heads;
2206         endhead = totrk % heads;
2207
2208         /* check for sequential prestage - enhance cylinder range */
2209         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2210             dedata->attributes.operation == DASD_SEQ_ACCESS) {
2211
2212                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2213                         endcyl += basepriv->attrib.nr_cyl;
2214                 else
2215                         endcyl = (basepriv->real_cyl - 1);
2216         }
2217
2218         set_ch_t(&dedata->beg_ext, begcyl, beghead);
2219         set_ch_t(&dedata->end_ext, endcyl, endhead);
2220
2221         dedata->ep_format = 0x20; /* records per track is valid */
2222         dedata->ep_rec_per_track = blk_per_trk;
2223
2224         if (rec_on_trk) {
2225                 switch (basepriv->rdc_data.dev_type) {
2226                 case 0x3390:
2227                         dn = ceil_quot(blksize + 6, 232);
2228                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
2229                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
2230                         break;
2231                 case 0x3380:
2232                         d = 7 + ceil_quot(blksize + 12, 32);
2233                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
2234                         break;
2235                 }
2236         }
2237
2238         lredata->auxiliary.length_valid = 1;
2239         lredata->auxiliary.length_scope = 1;
2240         lredata->auxiliary.imbedded_ccw_valid = 1;
2241         lredata->length = tlf;
2242         lredata->imbedded_ccw = cmd;
2243         lredata->count = count;
2244         lredata->sector = sector;
2245         set_ch_t(&lredata->seek_addr, begcyl, beghead);
2246         lredata->search_arg.cyl = lredata->seek_addr.cyl;
2247         lredata->search_arg.head = lredata->seek_addr.head;
2248         lredata->search_arg.record = rec_on_trk;
2249
2250         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
2251                      &pfxdata, sizeof(pfxdata), total_data_size);
2252
2253         return rc;
2254 }
2255
2256 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
2257                                                struct dasd_device *startdev,
2258                                                struct dasd_block *block,
2259                                                struct request *req,
2260                                                sector_t first_rec,
2261                                                sector_t last_rec,
2262                                                sector_t first_trk,
2263                                                sector_t last_trk,
2264                                                unsigned int first_offs,
2265                                                unsigned int last_offs,
2266                                                unsigned int blk_per_trk,
2267                                                unsigned int blksize)
2268 {
2269         struct dasd_eckd_private *private;
2270         struct dasd_ccw_req *cqr;
2271         struct req_iterator iter;
2272         struct bio_vec *bv;
2273         char *dst;
2274         unsigned int trkcount, ctidaw;
2275         unsigned char cmd;
2276         struct dasd_device *basedev;
2277         unsigned int tlf;
2278         struct itcw *itcw;
2279         struct tidaw *last_tidaw = NULL;
2280         int itcw_op;
2281         size_t itcw_size;
2282
2283         basedev = block->base;
2284         private = (struct dasd_eckd_private *) basedev->private;
2285         if (rq_data_dir(req) == READ) {
2286                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2287                 itcw_op = ITCW_OP_READ;
2288         } else if (rq_data_dir(req) == WRITE) {
2289                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2290                 itcw_op = ITCW_OP_WRITE;
2291         } else
2292                 return ERR_PTR(-EINVAL);
2293
2294         /* trackbased I/O needs address all memory via TIDAWs,
2295          * not just for 64 bit addresses. This allows us to map
2296          * each segment directly to one tidaw.
2297          */
2298         trkcount = last_trk - first_trk + 1;
2299         ctidaw = 0;
2300         rq_for_each_segment(bv, req, iter) {
2301                 ++ctidaw;
2302         }
2303
2304         /* Allocate the ccw request. */
2305         itcw_size = itcw_calc_size(0, ctidaw, 0);
2306         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2307         if (IS_ERR(cqr))
2308                 return cqr;
2309
2310         cqr->cpmode = 1;
2311         cqr->startdev = startdev;
2312         cqr->memdev = startdev;
2313         cqr->block = block;
2314         cqr->expires = 100*HZ;
2315         cqr->buildclk = get_clock();
2316         cqr->status = DASD_CQR_FILLED;
2317         cqr->retries = 10;
2318
2319         /* transfer length factor: how many bytes to read from the last track */
2320         if (first_trk == last_trk)
2321                 tlf = last_offs - first_offs + 1;
2322         else
2323                 tlf = last_offs + 1;
2324         tlf *= blksize;
2325
2326         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
2327         cqr->cpaddr = itcw_get_tcw(itcw);
2328
2329         if (prepare_itcw(itcw, first_trk, last_trk,
2330                          cmd, basedev, startdev,
2331                          first_offs + 1,
2332                          trkcount, blksize,
2333                          (last_rec - first_rec + 1) * blksize,
2334                          tlf, blk_per_trk) == -EAGAIN) {
2335                 /* Clock not in sync and XRC is enabled.
2336                  * Try again later.
2337                  */
2338                 dasd_sfree_request(cqr, startdev);
2339                 return ERR_PTR(-EAGAIN);
2340         }
2341
2342         /*
2343          * A tidaw can address 4k of memory, but must not cross page boundaries
2344          * We can let the block layer handle this by setting
2345          * blk_queue_segment_boundary to page boundaries and
2346          * blk_max_segment_size to page size when setting up the request queue.
2347          */
2348         rq_for_each_segment(bv, req, iter) {
2349                 dst = page_address(bv->bv_page) + bv->bv_offset;
2350                 last_tidaw = itcw_add_tidaw(itcw, 0x00, dst, bv->bv_len);
2351                 if (IS_ERR(last_tidaw))
2352                         return (struct dasd_ccw_req *)last_tidaw;
2353         }
2354
2355         last_tidaw->flags |= 0x80;
2356         itcw_finalize(itcw);
2357
2358         if (blk_noretry_request(req) ||
2359             block->base->features & DASD_FEATURE_FAILFAST)
2360                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2361         cqr->startdev = startdev;
2362         cqr->memdev = startdev;
2363         cqr->block = block;
2364         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
2365         cqr->lpm = private->path_data.ppm;
2366         cqr->retries = 256;
2367         cqr->buildclk = get_clock();
2368         cqr->status = DASD_CQR_FILLED;
2369         return cqr;
2370 }
2371
2372 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
2373                                                struct dasd_block *block,
2374                                                struct request *req)
2375 {
2376         int tpm, cmdrtd, cmdwtd;
2377         int use_prefix;
2378 #if defined(CONFIG_64BIT)
2379         int fcx_in_css, fcx_in_gneq, fcx_in_features;
2380 #endif
2381         struct dasd_eckd_private *private;
2382         struct dasd_device *basedev;
2383         sector_t first_rec, last_rec;
2384         sector_t first_trk, last_trk;
2385         unsigned int first_offs, last_offs;
2386         unsigned int blk_per_trk, blksize;
2387         int cdlspecial;
2388         struct dasd_ccw_req *cqr;
2389
2390         basedev = block->base;
2391         private = (struct dasd_eckd_private *) basedev->private;
2392
2393         /* Calculate number of blocks/records per track. */
2394         blksize = block->bp_block;
2395         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2396         if (blk_per_trk == 0)
2397                 return ERR_PTR(-EINVAL);
2398         /* Calculate record id of first and last block. */
2399         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
2400         first_offs = sector_div(first_trk, blk_per_trk);
2401         last_rec = last_trk =
2402                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
2403         last_offs = sector_div(last_trk, blk_per_trk);
2404         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
2405
2406         /* is transport mode supported? */
2407 #if defined(CONFIG_64BIT)
2408         fcx_in_css = css_general_characteristics.fcx;
2409         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
2410         fcx_in_features = private->features.feature[40] & 0x80;
2411         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
2412 #else
2413         tpm = 0;
2414 #endif
2415
2416         /* is read track data and write track data in command mode supported? */
2417         cmdrtd = private->features.feature[9] & 0x20;
2418         cmdwtd = private->features.feature[12] & 0x40;
2419         use_prefix = private->features.feature[8] & 0x01;
2420
2421         cqr = NULL;
2422         if (cdlspecial || dasd_page_cache) {
2423                 /* do nothing, just fall through to the cmd mode single case */
2424         } else if (!dasd_nofcx && tpm && (first_trk == last_trk)) {
2425                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
2426                                                     first_rec, last_rec,
2427                                                     first_trk, last_trk,
2428                                                     first_offs, last_offs,
2429                                                     blk_per_trk, blksize);
2430                 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
2431                         cqr = NULL;
2432         } else if (use_prefix &&
2433                    (((rq_data_dir(req) == READ) && cmdrtd) ||
2434                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
2435                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
2436                                                    first_rec, last_rec,
2437                                                    first_trk, last_trk,
2438                                                    first_offs, last_offs,
2439                                                    blk_per_trk, blksize);
2440                 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
2441                         cqr = NULL;
2442         }
2443         if (!cqr)
2444                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
2445                                                     first_rec, last_rec,
2446                                                     first_trk, last_trk,
2447                                                     first_offs, last_offs,
2448                                                     blk_per_trk, blksize);
2449         return cqr;
2450 }
2451
2452 static int
2453 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
2454 {
2455         struct dasd_eckd_private *private;
2456         struct ccw1 *ccw;
2457         struct req_iterator iter;
2458         struct bio_vec *bv;
2459         char *dst, *cda;
2460         unsigned int blksize, blk_per_trk, off;
2461         sector_t recid;
2462         int status;
2463
2464         if (!dasd_page_cache)
2465                 goto out;
2466         private = (struct dasd_eckd_private *) cqr->block->base->private;
2467         blksize = cqr->block->bp_block;
2468         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2469         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
2470         ccw = cqr->cpaddr;
2471         /* Skip over define extent & locate record. */
2472         ccw++;
2473         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
2474                 ccw++;
2475         rq_for_each_segment(bv, req, iter) {
2476                 dst = page_address(bv->bv_page) + bv->bv_offset;
2477                 for (off = 0; off < bv->bv_len; off += blksize) {
2478                         /* Skip locate record. */
2479                         if (private->uses_cdl && recid <= 2*blk_per_trk)
2480                                 ccw++;
2481                         if (dst) {
2482                                 if (ccw->flags & CCW_FLAG_IDA)
2483                                         cda = *((char **)((addr_t) ccw->cda));
2484                                 else
2485                                         cda = (char *)((addr_t) ccw->cda);
2486                                 if (dst != cda) {
2487                                         if (rq_data_dir(req) == READ)
2488                                                 memcpy(dst, cda, bv->bv_len);
2489                                         kmem_cache_free(dasd_page_cache,
2490                                             (void *)((addr_t)cda & PAGE_MASK));
2491                                 }
2492                                 dst = NULL;
2493                         }
2494                         ccw++;
2495                         recid++;
2496                 }
2497         }
2498 out:
2499         status = cqr->status == DASD_CQR_DONE;
2500         dasd_sfree_request(cqr, cqr->memdev);
2501         return status;
2502 }
2503
2504 /*
2505  * Modify ccw/tcw in cqr so it can be started on a base device.
2506  *
2507  * Note that this is not enough to restart the cqr!
2508  * Either reset cqr->startdev as well (summary unit check handling)
2509  * or restart via separate cqr (as in ERP handling).
2510  */
2511 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
2512 {
2513         struct ccw1 *ccw;
2514         struct PFX_eckd_data *pfxdata;
2515         struct tcw *tcw;
2516         struct tccb *tccb;
2517         struct dcw *dcw;
2518
2519         if (cqr->cpmode == 1) {
2520                 tcw = cqr->cpaddr;
2521                 tccb = tcw_get_tccb(tcw);
2522                 dcw = (struct dcw *)&tccb->tca[0];
2523                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
2524                 pfxdata->validity.verify_base = 0;
2525                 pfxdata->validity.hyper_pav = 0;
2526         } else {
2527                 ccw = cqr->cpaddr;
2528                 pfxdata = cqr->data;
2529                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
2530                         pfxdata->validity.verify_base = 0;
2531                         pfxdata->validity.hyper_pav = 0;
2532                 }
2533         }
2534 }
2535
2536 #define DASD_ECKD_CHANQ_MAX_SIZE 4
2537
2538 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
2539                                                      struct dasd_block *block,
2540                                                      struct request *req)
2541 {
2542         struct dasd_eckd_private *private;
2543         struct dasd_device *startdev;
2544         unsigned long flags;
2545         struct dasd_ccw_req *cqr;
2546
2547         startdev = dasd_alias_get_start_dev(base);
2548         if (!startdev)
2549                 startdev = base;
2550         private = (struct dasd_eckd_private *) startdev->private;
2551         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
2552                 return ERR_PTR(-EBUSY);
2553
2554         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
2555         private->count++;
2556         cqr = dasd_eckd_build_cp(startdev, block, req);
2557         if (IS_ERR(cqr))
2558                 private->count--;
2559         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
2560         return cqr;
2561 }
2562
2563 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
2564                                    struct request *req)
2565 {
2566         struct dasd_eckd_private *private;
2567         unsigned long flags;
2568
2569         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
2570         private = (struct dasd_eckd_private *) cqr->memdev->private;
2571         private->count--;
2572         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
2573         return dasd_eckd_free_cp(cqr, req);
2574 }
2575
2576 static int
2577 dasd_eckd_fill_info(struct dasd_device * device,
2578                     struct dasd_information2_t * info)
2579 {
2580         struct dasd_eckd_private *private;
2581
2582         private = (struct dasd_eckd_private *) device->private;
2583         info->label_block = 2;
2584         info->FBA_layout = private->uses_cdl ? 0 : 1;
2585         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
2586         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
2587         memcpy(info->characteristics, &private->rdc_data,
2588                sizeof(struct dasd_eckd_characteristics));
2589         info->confdata_size = min((unsigned long)private->conf_len,
2590                                   sizeof(info->configuration_data));
2591         memcpy(info->configuration_data, private->conf_data,
2592                info->confdata_size);
2593         return 0;
2594 }
2595
2596 /*
2597  * SECTION: ioctl functions for eckd devices.
2598  */
2599
2600 /*
2601  * Release device ioctl.
2602  * Buils a channel programm to releases a prior reserved
2603  * (see dasd_eckd_reserve) device.
2604  */
2605 static int
2606 dasd_eckd_release(struct dasd_device *device)
2607 {
2608         struct dasd_ccw_req *cqr;
2609         int rc;
2610         struct ccw1 *ccw;
2611
2612         if (!capable(CAP_SYS_ADMIN))
2613                 return -EACCES;
2614
2615         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
2616         if (IS_ERR(cqr)) {
2617                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2618                             "Could not allocate initialization request");
2619                 return PTR_ERR(cqr);
2620         }
2621         ccw = cqr->cpaddr;
2622         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
2623         ccw->flags |= CCW_FLAG_SLI;
2624         ccw->count = 32;
2625         ccw->cda = (__u32)(addr_t) cqr->data;
2626         cqr->startdev = device;
2627         cqr->memdev = device;
2628         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2629         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2630         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2631         cqr->expires = 2 * HZ;
2632         cqr->buildclk = get_clock();
2633         cqr->status = DASD_CQR_FILLED;
2634
2635         rc = dasd_sleep_on_immediatly(cqr);
2636
2637         dasd_sfree_request(cqr, cqr->memdev);
2638         return rc;
2639 }
2640
2641 /*
2642  * Reserve device ioctl.
2643  * Options are set to 'synchronous wait for interrupt' and
2644  * 'timeout the request'. This leads to a terminate IO if
2645  * the interrupt is outstanding for a certain time.
2646  */
2647 static int
2648 dasd_eckd_reserve(struct dasd_device *device)
2649 {
2650         struct dasd_ccw_req *cqr;
2651         int rc;
2652         struct ccw1 *ccw;
2653
2654         if (!capable(CAP_SYS_ADMIN))
2655                 return -EACCES;
2656
2657         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
2658         if (IS_ERR(cqr)) {
2659                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2660                             "Could not allocate initialization request");
2661                 return PTR_ERR(cqr);
2662         }
2663         ccw = cqr->cpaddr;
2664         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
2665         ccw->flags |= CCW_FLAG_SLI;
2666         ccw->count = 32;
2667         ccw->cda = (__u32)(addr_t) cqr->data;
2668         cqr->startdev = device;
2669         cqr->memdev = device;
2670         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2671         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2672         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2673         cqr->expires = 2 * HZ;
2674         cqr->buildclk = get_clock();
2675         cqr->status = DASD_CQR_FILLED;
2676
2677         rc = dasd_sleep_on_immediatly(cqr);
2678
2679         dasd_sfree_request(cqr, cqr->memdev);
2680         return rc;
2681 }
2682
2683 /*
2684  * Steal lock ioctl - unconditional reserve device.
2685  * Buils a channel programm to break a device's reservation.
2686  * (unconditional reserve)
2687  */
2688 static int
2689 dasd_eckd_steal_lock(struct dasd_device *device)
2690 {
2691         struct dasd_ccw_req *cqr;
2692         int rc;
2693         struct ccw1 *ccw;
2694
2695         if (!capable(CAP_SYS_ADMIN))
2696                 return -EACCES;
2697
2698         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
2699         if (IS_ERR(cqr)) {
2700                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2701                             "Could not allocate initialization request");
2702                 return PTR_ERR(cqr);
2703         }
2704         ccw = cqr->cpaddr;
2705         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
2706         ccw->flags |= CCW_FLAG_SLI;
2707         ccw->count = 32;
2708         ccw->cda = (__u32)(addr_t) cqr->data;
2709         cqr->startdev = device;
2710         cqr->memdev = device;
2711         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2712         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2713         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2714         cqr->expires = 2 * HZ;
2715         cqr->buildclk = get_clock();
2716         cqr->status = DASD_CQR_FILLED;
2717
2718         rc = dasd_sleep_on_immediatly(cqr);
2719
2720         dasd_sfree_request(cqr, cqr->memdev);
2721         return rc;
2722 }
2723
2724 /*
2725  * Read performance statistics
2726  */
2727 static int
2728 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
2729 {
2730         struct dasd_psf_prssd_data *prssdp;
2731         struct dasd_rssd_perf_stats_t *stats;
2732         struct dasd_ccw_req *cqr;
2733         struct ccw1 *ccw;
2734         int rc;
2735
2736         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
2737                                    (sizeof(struct dasd_psf_prssd_data) +
2738                                     sizeof(struct dasd_rssd_perf_stats_t)),
2739                                    device);
2740         if (IS_ERR(cqr)) {
2741                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2742                             "Could not allocate initialization request");
2743                 return PTR_ERR(cqr);
2744         }
2745         cqr->startdev = device;
2746         cqr->memdev = device;
2747         cqr->retries = 0;
2748         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2749         cqr->expires = 10 * HZ;
2750
2751         /* Prepare for Read Subsystem Data */
2752         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
2753         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
2754         prssdp->order = PSF_ORDER_PRSSD;
2755         prssdp->suborder = 0x01;        /* Performance Statistics */
2756         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
2757
2758         ccw = cqr->cpaddr;
2759         ccw->cmd_code = DASD_ECKD_CCW_PSF;
2760         ccw->count = sizeof(struct dasd_psf_prssd_data);
2761         ccw->flags |= CCW_FLAG_CC;
2762         ccw->cda = (__u32)(addr_t) prssdp;
2763
2764         /* Read Subsystem Data - Performance Statistics */
2765         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
2766         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
2767
2768         ccw++;
2769         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
2770         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
2771         ccw->cda = (__u32)(addr_t) stats;
2772
2773         cqr->buildclk = get_clock();
2774         cqr->status = DASD_CQR_FILLED;
2775         rc = dasd_sleep_on(cqr);
2776         if (rc == 0) {
2777                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
2778                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
2779                 if (copy_to_user(argp, stats,
2780                                  sizeof(struct dasd_rssd_perf_stats_t)))
2781                         rc = -EFAULT;
2782         }
2783         dasd_sfree_request(cqr, cqr->memdev);
2784         return rc;
2785 }
2786
2787 /*
2788  * Get attributes (cache operations)
2789  * Returnes the cache attributes used in Define Extend (DE).
2790  */
2791 static int
2792 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
2793 {
2794         struct dasd_eckd_private *private =
2795                 (struct dasd_eckd_private *)device->private;
2796         struct attrib_data_t attrib = private->attrib;
2797         int rc;
2798
2799         if (!capable(CAP_SYS_ADMIN))
2800                 return -EACCES;
2801         if (!argp)
2802                 return -EINVAL;
2803
2804         rc = 0;
2805         if (copy_to_user(argp, (long *) &attrib,
2806                          sizeof(struct attrib_data_t)))
2807                 rc = -EFAULT;
2808
2809         return rc;
2810 }
2811
2812 /*
2813  * Set attributes (cache operations)
2814  * Stores the attributes for cache operation to be used in Define Extend (DE).
2815  */
2816 static int
2817 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
2818 {
2819         struct dasd_eckd_private *private =
2820                 (struct dasd_eckd_private *)device->private;
2821         struct attrib_data_t attrib;
2822
2823         if (!capable(CAP_SYS_ADMIN))
2824                 return -EACCES;
2825         if (!argp)
2826                 return -EINVAL;
2827
2828         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
2829                 return -EFAULT;
2830         private->attrib = attrib;
2831
2832         dev_info(&device->cdev->dev,
2833                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
2834                  private->attrib.operation, private->attrib.nr_cyl);
2835         return 0;
2836 }
2837
2838 /*
2839  * Issue syscall I/O to EMC Symmetrix array.
2840  * CCWs are PSF and RSSD
2841  */
2842 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
2843 {
2844         struct dasd_symmio_parms usrparm;
2845         char *psf_data, *rssd_result;
2846         struct dasd_ccw_req *cqr;
2847         struct ccw1 *ccw;
2848         char psf0, psf1;
2849         int rc;
2850
2851         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
2852                 return -EACCES;
2853         psf0 = psf1 = 0;
2854
2855         /* Copy parms from caller */
2856         rc = -EFAULT;
2857         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
2858                 goto out;
2859         if (is_compat_task() || sizeof(long) == 4) {
2860                 /* Make sure pointers are sane even on 31 bit. */
2861                 rc = -EINVAL;
2862                 if ((usrparm.psf_data >> 32) != 0)
2863                         goto out;
2864                 if ((usrparm.rssd_result >> 32) != 0)
2865                         goto out;
2866                 usrparm.psf_data &= 0x7fffffffULL;
2867                 usrparm.rssd_result &= 0x7fffffffULL;
2868         }
2869         /* alloc I/O data area */
2870         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
2871         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
2872         if (!psf_data || !rssd_result) {
2873                 rc = -ENOMEM;
2874                 goto out_free;
2875         }
2876
2877         /* get syscall header from user space */
2878         rc = -EFAULT;
2879         if (copy_from_user(psf_data,
2880                            (void __user *)(unsigned long) usrparm.psf_data,
2881                            usrparm.psf_data_len))
2882                 goto out_free;
2883         psf0 = psf_data[0];
2884         psf1 = psf_data[1];
2885
2886         /* setup CCWs for PSF + RSSD */
2887         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
2888         if (IS_ERR(cqr)) {
2889                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2890                         "Could not allocate initialization request");
2891                 rc = PTR_ERR(cqr);
2892                 goto out_free;
2893         }
2894
2895         cqr->startdev = device;
2896         cqr->memdev = device;
2897         cqr->retries = 3;
2898         cqr->expires = 10 * HZ;
2899         cqr->buildclk = get_clock();
2900         cqr->status = DASD_CQR_FILLED;
2901
2902         /* Build the ccws */
2903         ccw = cqr->cpaddr;
2904
2905         /* PSF ccw */
2906         ccw->cmd_code = DASD_ECKD_CCW_PSF;
2907         ccw->count = usrparm.psf_data_len;
2908         ccw->flags |= CCW_FLAG_CC;
2909         ccw->cda = (__u32)(addr_t) psf_data;
2910
2911         ccw++;
2912
2913         /* RSSD ccw  */
2914         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
2915         ccw->count = usrparm.rssd_result_len;
2916         ccw->flags = CCW_FLAG_SLI ;
2917         ccw->cda = (__u32)(addr_t) rssd_result;
2918
2919         rc = dasd_sleep_on(cqr);
2920         if (rc)
2921                 goto out_sfree;
2922
2923         rc = -EFAULT;
2924         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
2925                            rssd_result, usrparm.rssd_result_len))
2926                 goto out_sfree;
2927         rc = 0;
2928
2929 out_sfree:
2930         dasd_sfree_request(cqr, cqr->memdev);
2931 out_free:
2932         kfree(rssd_result);
2933         kfree(psf_data);
2934 out:
2935         DBF_DEV_EVENT(DBF_WARNING, device,
2936                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
2937                       (int) psf0, (int) psf1, rc);
2938         return rc;
2939 }
2940
2941 static int
2942 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
2943 {
2944         struct dasd_device *device = block->base;
2945
2946         switch (cmd) {
2947         case BIODASDGATTR:
2948                 return dasd_eckd_get_attrib(device, argp);
2949         case BIODASDSATTR:
2950                 return dasd_eckd_set_attrib(device, argp);
2951         case BIODASDPSRD:
2952                 return dasd_eckd_performance(device, argp);
2953         case BIODASDRLSE:
2954                 return dasd_eckd_release(device);
2955         case BIODASDRSRV:
2956                 return dasd_eckd_reserve(device);
2957         case BIODASDSLCK:
2958                 return dasd_eckd_steal_lock(device);
2959         case BIODASDSYMMIO:
2960                 return dasd_symm_io(device, argp);
2961         default:
2962                 return -ENOIOCTLCMD;
2963         }
2964 }
2965
2966 /*
2967  * Dump the range of CCWs into 'page' buffer
2968  * and return number of printed chars.
2969  */
2970 static int
2971 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
2972 {
2973         int len, count;
2974         char *datap;
2975
2976         len = 0;
2977         while (from <= to) {
2978                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2979                                " CCW %p: %08X %08X DAT:",
2980                                from, ((int *) from)[0], ((int *) from)[1]);
2981
2982                 /* get pointer to data (consider IDALs) */
2983                 if (from->flags & CCW_FLAG_IDA)
2984                         datap = (char *) *((addr_t *) (addr_t) from->cda);
2985                 else
2986                         datap = (char *) ((addr_t) from->cda);
2987
2988                 /* dump data (max 32 bytes) */
2989                 for (count = 0; count < from->count && count < 32; count++) {
2990                         if (count % 8 == 0) len += sprintf(page + len, " ");
2991                         if (count % 4 == 0) len += sprintf(page + len, " ");
2992                         len += sprintf(page + len, "%02x", datap[count]);
2993                 }
2994                 len += sprintf(page + len, "\n");
2995                 from++;
2996         }
2997         return len;
2998 }
2999
3000 static void
3001 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
3002                          char *reason)
3003 {
3004         u64 *sense;
3005
3006         sense = (u64 *) dasd_get_sense(irb);
3007         if (sense) {
3008                 DBF_DEV_EVENT(DBF_EMERG, device,
3009                               "%s: %s %02x%02x%02x %016llx %016llx %016llx "
3010                               "%016llx", reason,
3011                               scsw_is_tm(&irb->scsw) ? "t" : "c",
3012                               scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw),
3013                               scsw_dstat(&irb->scsw), sense[0], sense[1],
3014                               sense[2], sense[3]);
3015         } else {
3016                 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
3017                               "SORRY - NO VALID SENSE AVAILABLE\n");
3018         }
3019 }
3020
3021 /*
3022  * Print sense data and related channel program.
3023  * Parts are printed because printk buffer is only 1024 bytes.
3024  */
3025 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
3026                                  struct dasd_ccw_req *req, struct irb *irb)
3027 {
3028         char *page;
3029         struct ccw1 *first, *last, *fail, *from, *to;
3030         int len, sl, sct;
3031
3032         page = (char *) get_zeroed_page(GFP_ATOMIC);
3033         if (page == NULL) {
3034                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3035                               "No memory to dump sense data\n");
3036                 return;
3037         }
3038         /* dump the sense data */
3039         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3040                       " I/O status report for device %s:\n",
3041                       dev_name(&device->cdev->dev));
3042         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3043                        " in req: %p CS: 0x%02X DS: 0x%02X CC: 0x%02X RC: %d\n",
3044                        req, scsw_cstat(&irb->scsw), scsw_dstat(&irb->scsw),
3045                        scsw_cc(&irb->scsw), req ? req->intrc : 0);
3046         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3047                        " device %s: Failing CCW: %p\n",
3048                        dev_name(&device->cdev->dev),
3049                        (void *) (addr_t) irb->scsw.cmd.cpa);
3050         if (irb->esw.esw0.erw.cons) {
3051                 for (sl = 0; sl < 4; sl++) {
3052                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3053                                        " Sense(hex) %2d-%2d:",
3054                                        (8 * sl), ((8 * sl) + 7));
3055
3056                         for (sct = 0; sct < 8; sct++) {
3057                                 len += sprintf(page + len, " %02x",
3058                                                irb->ecw[8 * sl + sct]);
3059                         }
3060                         len += sprintf(page + len, "\n");
3061                 }
3062
3063                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
3064                         /* 24 Byte Sense Data */
3065                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3066                                 " 24 Byte: %x MSG %x, "
3067                                 "%s MSGb to SYSOP\n",
3068                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
3069                                 irb->ecw[1] & 0x10 ? "" : "no");
3070                 } else {
3071                         /* 32 Byte Sense Data */
3072                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3073                                 " 32 Byte: Format: %x "
3074                                 "Exception class %x\n",
3075                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
3076                 }
3077         } else {
3078                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3079                         " SORRY - NO VALID SENSE AVAILABLE\n");
3080         }
3081         printk("%s", page);
3082
3083         if (req) {
3084                 /* req == NULL for unsolicited interrupts */
3085                 /* dump the Channel Program (max 140 Bytes per line) */
3086                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
3087                 first = req->cpaddr;
3088                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
3089                 to = min(first + 6, last);
3090                 len = sprintf(page,  KERN_ERR PRINTK_HEADER
3091                               " Related CP in req: %p\n", req);
3092                 dasd_eckd_dump_ccw_range(first, to, page + len);
3093                 printk("%s", page);
3094
3095                 /* print failing CCW area (maximum 4) */
3096                 /* scsw->cda is either valid or zero  */
3097                 len = 0;
3098                 from = ++to;
3099                 fail = (struct ccw1 *)(addr_t)
3100                                 irb->scsw.cmd.cpa; /* failing CCW */
3101                 if (from <  fail - 2) {
3102                         from = fail - 2;     /* there is a gap - print header */
3103                         len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
3104                 }
3105                 to = min(fail + 1, last);
3106                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
3107
3108                 /* print last CCWs (maximum 2) */
3109                 from = max(from, ++to);
3110                 if (from < last - 1) {
3111                         from = last - 1;     /* there is a gap - print header */
3112                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
3113                 }
3114                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
3115                 if (len > 0)
3116                         printk("%s", page);
3117         }
3118         free_page((unsigned long) page);
3119 }
3120
3121
3122 /*
3123  * Print sense data from a tcw.
3124  */
3125 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
3126                                  struct dasd_ccw_req *req, struct irb *irb)
3127 {
3128         char *page;
3129         int len, sl, sct, residual;
3130
3131         struct tsb *tsb;
3132         u8 *sense;
3133
3134
3135         page = (char *) get_zeroed_page(GFP_ATOMIC);
3136         if (page == NULL) {
3137                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
3138                             "No memory to dump sense data");
3139                 return;
3140         }
3141         /* dump the sense data */
3142         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3143                       " I/O status report for device %s:\n",
3144                       dev_name(&device->cdev->dev));
3145         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3146                        " in req: %p CS: 0x%02X DS: 0x%02X CC: 0x%02X RC: %d "
3147                        "fcxs: 0x%02X schxs: 0x%02X\n", req,
3148                        scsw_cstat(&irb->scsw), scsw_dstat(&irb->scsw),
3149                        scsw_cc(&irb->scsw), req->intrc,
3150                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs);
3151         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3152                        " device %s: Failing TCW: %p\n",
3153                        dev_name(&device->cdev->dev),
3154                        (void *) (addr_t) irb->scsw.tm.tcw);
3155
3156         tsb = NULL;
3157         sense = NULL;
3158         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs == 0x01))
3159                 tsb = tcw_get_tsb(
3160                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
3161
3162         if (tsb) {
3163                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3164                                " tsb->length %d\n", tsb->length);
3165                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3166                                " tsb->flags %x\n", tsb->flags);
3167                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3168                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
3169                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3170                                " tsb->count %d\n", tsb->count);
3171                 residual = tsb->count - 28;
3172                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3173                                " residual %d\n", residual);
3174
3175                 switch (tsb->flags & 0x07) {
3176                 case 1: /* tsa_iostat */
3177                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3178                                " tsb->tsa.iostat.dev_time %d\n",
3179                                        tsb->tsa.iostat.dev_time);
3180                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3181                                " tsb->tsa.iostat.def_time %d\n",
3182                                        tsb->tsa.iostat.def_time);
3183                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3184                                " tsb->tsa.iostat.queue_time %d\n",
3185                                        tsb->tsa.iostat.queue_time);
3186                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3187                                " tsb->tsa.iostat.dev_busy_time %d\n",
3188                                        tsb->tsa.iostat.dev_busy_time);
3189                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3190                                " tsb->tsa.iostat.dev_act_time %d\n",
3191                                        tsb->tsa.iostat.dev_act_time);
3192                         sense = tsb->tsa.iostat.sense;
3193                         break;
3194                 case 2: /* ts_ddpc */
3195                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3196                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
3197                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3198                                " tsb->tsa.ddpc.rcq:  ");
3199                         for (sl = 0; sl < 16; sl++) {
3200                                 for (sct = 0; sct < 8; sct++) {
3201                                         len += sprintf(page + len, " %02x",
3202                                                        tsb->tsa.ddpc.rcq[sl]);
3203                                 }
3204                                 len += sprintf(page + len, "\n");
3205                         }
3206                         sense = tsb->tsa.ddpc.sense;
3207                         break;
3208                 case 3: /* tsa_intrg */
3209                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3210                                       " tsb->tsa.intrg.: not supportet yet \n");
3211                         break;
3212                 }
3213
3214                 if (sense) {
3215                         for (sl = 0; sl < 4; sl++) {
3216                                 len += sprintf(page + len,
3217                                                KERN_ERR PRINTK_HEADER
3218                                                " Sense(hex) %2d-%2d:",
3219                                                (8 * sl), ((8 * sl) + 7));
3220                                 for (sct = 0; sct < 8; sct++) {
3221                                         len += sprintf(page + len, " %02x",
3222                                                        sense[8 * sl + sct]);
3223                                 }
3224                                 len += sprintf(page + len, "\n");
3225                         }
3226
3227                         if (sense[27] & DASD_SENSE_BIT_0) {
3228                                 /* 24 Byte Sense Data */
3229                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3230                                         " 24 Byte: %x MSG %x, "
3231                                         "%s MSGb to SYSOP\n",
3232                                         sense[7] >> 4, sense[7] & 0x0f,
3233                                         sense[1] & 0x10 ? "" : "no");
3234                         } else {
3235                                 /* 32 Byte Sense Data */
3236                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3237                                         " 32 Byte: Format: %x "
3238                                         "Exception class %x\n",
3239                                         sense[6] & 0x0f, sense[22] >> 4);
3240                         }
3241                 } else {
3242                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3243                                 " SORRY - NO VALID SENSE AVAILABLE\n");
3244                 }
3245         } else {
3246                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3247                         " SORRY - NO TSB DATA AVAILABLE\n");
3248         }
3249         printk("%s", page);
3250         free_page((unsigned long) page);
3251 }
3252
3253 static void dasd_eckd_dump_sense(struct dasd_device *device,
3254                                  struct dasd_ccw_req *req, struct irb *irb)
3255 {
3256         if (req && scsw_is_tm(&req->irb.scsw))
3257                 dasd_eckd_dump_sense_tcw(device, req, irb);
3258         else
3259                 dasd_eckd_dump_sense_ccw(device, req, irb);
3260 }
3261
3262 int dasd_eckd_pm_freeze(struct dasd_device *device)
3263 {
3264         /*
3265          * the device should be disconnected from our LCU structure
3266          * on restore we will reconnect it and reread LCU specific
3267          * information like PAV support that might have changed
3268          */
3269         dasd_alias_remove_device(device);
3270         dasd_alias_disconnect_device_from_lcu(device);
3271
3272         return 0;
3273 }
3274
3275 int dasd_eckd_restore_device(struct dasd_device *device)
3276 {
3277         struct dasd_eckd_private *private;
3278         struct dasd_eckd_characteristics temp_rdc_data;
3279         int is_known, rc;
3280         struct dasd_uid temp_uid;
3281         unsigned long flags;
3282
3283         private = (struct dasd_eckd_private *) device->private;
3284
3285         /* Read Configuration Data */
3286         rc = dasd_eckd_read_conf(device);
3287         if (rc)
3288                 goto out_err;
3289
3290         /* Generate device unique id and register in devmap */
3291         rc = dasd_eckd_generate_uid(device, &private->uid);
3292         dasd_get_uid(device->cdev, &temp_uid);
3293         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
3294                 dev_err(&device->cdev->dev, "The UID of the DASD has "
3295                         "changed\n");
3296         if (rc)
3297                 goto out_err;
3298         dasd_set_uid(device->cdev, &private->uid);
3299
3300         /* register lcu with alias handling, enable PAV if this is a new lcu */
3301         is_known = dasd_alias_make_device_known_to_lcu(device);
3302         if (is_known < 0)
3303                 return is_known;
3304         if (!is_known) {
3305                 dasd_eckd_validate_server(device);
3306                 dasd_alias_lcu_setup_complete(device);
3307         } else
3308                 dasd_alias_wait_for_lcu_setup(device);
3309
3310         /* RE-Read Configuration Data */
3311         rc = dasd_eckd_read_conf(device);
3312         if (rc)
3313                 goto out_err;
3314
3315         /* Read Feature Codes */
3316         dasd_eckd_read_features(device);
3317
3318         /* Read Device Characteristics */
3319         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
3320                                          &temp_rdc_data, 64);
3321         if (rc) {
3322                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
3323                                 "Read device characteristic failed, rc=%d", rc);
3324                 goto out_err;
3325         }
3326         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
3327         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
3328         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
3329
3330         /* add device to alias management */
3331         dasd_alias_add_device(device);
3332
3333         return 0;
3334
3335 out_err:
3336         return -1;
3337 }
3338
3339 static struct ccw_driver dasd_eckd_driver = {
3340         .name        = "dasd-eckd",
3341         .owner       = THIS_MODULE,
3342         .ids         = dasd_eckd_ids,
3343         .probe       = dasd_eckd_probe,
3344         .remove      = dasd_generic_remove,
3345         .set_offline = dasd_generic_set_offline,
3346         .set_online  = dasd_eckd_set_online,
3347         .notify      = dasd_generic_notify,
3348         .freeze      = dasd_generic_pm_freeze,
3349         .thaw        = dasd_generic_restore_device,
3350         .restore     = dasd_generic_restore_device,
3351 };
3352
3353 /*
3354  * max_blocks is dependent on the amount of storage that is available
3355  * in the static io buffer for each device. Currently each device has
3356  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
3357  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
3358  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
3359  * addition we have one define extent ccw + 16 bytes of data and one
3360  * locate record ccw + 16 bytes of data. That makes:
3361  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
3362  * We want to fit two into the available memory so that we can immediately
3363  * start the next request if one finishes off. That makes 249.5 blocks
3364  * for one request. Give a little safety and the result is 240.
3365  */
3366 static struct dasd_discipline dasd_eckd_discipline = {
3367         .owner = THIS_MODULE,
3368         .name = "ECKD",
3369         .ebcname = "ECKD",
3370         .max_blocks = 240,
3371         .check_device = dasd_eckd_check_characteristics,
3372         .uncheck_device = dasd_eckd_uncheck_device,
3373         .do_analysis = dasd_eckd_do_analysis,
3374         .ready_to_online = dasd_eckd_ready_to_online,
3375         .online_to_ready = dasd_eckd_online_to_ready,
3376         .fill_geometry = dasd_eckd_fill_geometry,
3377         .start_IO = dasd_start_IO,
3378         .term_IO = dasd_term_IO,
3379         .handle_terminated_request = dasd_eckd_handle_terminated_request,
3380         .format_device = dasd_eckd_format_device,
3381         .erp_action = dasd_eckd_erp_action,
3382         .erp_postaction = dasd_eckd_erp_postaction,
3383         .handle_unsolicited_interrupt = dasd_eckd_handle_unsolicited_interrupt,
3384         .build_cp = dasd_eckd_build_alias_cp,
3385         .free_cp = dasd_eckd_free_alias_cp,
3386         .dump_sense = dasd_eckd_dump_sense,
3387         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
3388         .fill_info = dasd_eckd_fill_info,
3389         .ioctl = dasd_eckd_ioctl,
3390         .freeze = dasd_eckd_pm_freeze,
3391         .restore = dasd_eckd_restore_device,
3392 };
3393
3394 static int __init
3395 dasd_eckd_init(void)
3396 {
3397         int ret;
3398
3399         ASCEBC(dasd_eckd_discipline.ebcname, 4);
3400         ret = ccw_driver_register(&dasd_eckd_driver);
3401         if (!ret)
3402                 wait_for_device_probe();
3403
3404         return ret;
3405 }
3406
3407 static void __exit
3408 dasd_eckd_cleanup(void)
3409 {
3410         ccw_driver_unregister(&dasd_eckd_driver);
3411 }
3412
3413 module_init(dasd_eckd_init);
3414 module_exit(dasd_eckd_cleanup);