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
1093         if (!ccw_device_is_pathgroup(device->cdev)) {
1094                 dev_warn(&device->cdev->dev,
1095                          "A channel path group could not be established\n");
1096                 return -EIO;
1097         }
1098         if (!ccw_device_is_multipath(device->cdev)) {
1099                 dev_info(&device->cdev->dev,
1100                          "The DASD is not operating in multipath mode\n");
1101         }
1102         private = (struct dasd_eckd_private *) device->private;
1103         if (!private) {
1104                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1105                 if (!private) {
1106                         dev_warn(&device->cdev->dev,
1107                                  "Allocating memory for private DASD data "
1108                                  "failed\n");
1109                         return -ENOMEM;
1110                 }
1111                 device->private = (void *) private;
1112         } else {
1113                 memset(private, 0, sizeof(*private));
1114         }
1115         /* Invalidate status of initial analysis. */
1116         private->init_cqr_status = -1;
1117         /* Set default cache operations. */
1118         private->attrib.operation = DASD_NORMAL_CACHE;
1119         private->attrib.nr_cyl = 0;
1120
1121         /* Read Configuration Data */
1122         rc = dasd_eckd_read_conf(device);
1123         if (rc)
1124                 goto out_err1;
1125
1126         /* Generate device unique id and register in devmap */
1127         rc = dasd_eckd_generate_uid(device, &private->uid);
1128         if (rc)
1129                 goto out_err1;
1130         dasd_set_uid(device->cdev, &private->uid);
1131
1132         if (private->uid.type == UA_BASE_DEVICE) {
1133                 block = dasd_alloc_block();
1134                 if (IS_ERR(block)) {
1135                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1136                                         "could not allocate dasd "
1137                                         "block structure");
1138                         rc = PTR_ERR(block);
1139                         goto out_err1;
1140                 }
1141                 device->block = block;
1142                 block->base = device;
1143         }
1144
1145         /* register lcu with alias handling, enable PAV if this is a new lcu */
1146         is_known = dasd_alias_make_device_known_to_lcu(device);
1147         if (is_known < 0) {
1148                 rc = is_known;
1149                 goto out_err2;
1150         }
1151         /*
1152          * dasd_eckd_vaildate_server is done on the first device that
1153          * is found for an LCU. All later other devices have to wait
1154          * for it, so they will read the correct feature codes.
1155          */
1156         if (!is_known) {
1157                 dasd_eckd_validate_server(device);
1158                 dasd_alias_lcu_setup_complete(device);
1159         } else
1160                 dasd_alias_wait_for_lcu_setup(device);
1161
1162         /* device may report different configuration data after LCU setup */
1163         rc = dasd_eckd_read_conf(device);
1164         if (rc)
1165                 goto out_err3;
1166
1167         /* Read Feature Codes */
1168         dasd_eckd_read_features(device);
1169
1170         /* Read Device Characteristics */
1171         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1172                                          &private->rdc_data, 64);
1173         if (rc) {
1174                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1175                                 "Read device characteristic failed, rc=%d", rc);
1176                 goto out_err3;
1177         }
1178         /* find the vaild cylinder size */
1179         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1180             private->rdc_data.long_no_cyl)
1181                 private->real_cyl = private->rdc_data.long_no_cyl;
1182         else
1183                 private->real_cyl = private->rdc_data.no_cyl;
1184
1185         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1186                  "with %d cylinders, %d heads, %d sectors\n",
1187                  private->rdc_data.dev_type,
1188                  private->rdc_data.dev_model,
1189                  private->rdc_data.cu_type,
1190                  private->rdc_data.cu_model.model,
1191                  private->real_cyl,
1192                  private->rdc_data.trk_per_cyl,
1193                  private->rdc_data.sec_per_trk);
1194         return 0;
1195
1196 out_err3:
1197         dasd_alias_disconnect_device_from_lcu(device);
1198 out_err2:
1199         dasd_free_block(device->block);
1200         device->block = NULL;
1201 out_err1:
1202         kfree(private->conf_data);
1203         kfree(device->private);
1204         device->private = NULL;
1205         return rc;
1206 }
1207
1208 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1209 {
1210         struct dasd_eckd_private *private;
1211
1212         private = (struct dasd_eckd_private *) device->private;
1213         dasd_alias_disconnect_device_from_lcu(device);
1214         private->ned = NULL;
1215         private->sneq = NULL;
1216         private->vdsneq = NULL;
1217         private->gneq = NULL;
1218         private->conf_len = 0;
1219         kfree(private->conf_data);
1220         private->conf_data = NULL;
1221 }
1222
1223 static struct dasd_ccw_req *
1224 dasd_eckd_analysis_ccw(struct dasd_device *device)
1225 {
1226         struct dasd_eckd_private *private;
1227         struct eckd_count *count_data;
1228         struct LO_eckd_data *LO_data;
1229         struct dasd_ccw_req *cqr;
1230         struct ccw1 *ccw;
1231         int cplength, datasize;
1232         int i;
1233
1234         private = (struct dasd_eckd_private *) device->private;
1235
1236         cplength = 8;
1237         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1238         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1239         if (IS_ERR(cqr))
1240                 return cqr;
1241         ccw = cqr->cpaddr;
1242         /* Define extent for the first 3 tracks. */
1243         define_extent(ccw++, cqr->data, 0, 2,
1244                       DASD_ECKD_CCW_READ_COUNT, device);
1245         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1246         /* Locate record for the first 4 records on track 0. */
1247         ccw[-1].flags |= CCW_FLAG_CC;
1248         locate_record(ccw++, LO_data++, 0, 0, 4,
1249                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1250
1251         count_data = private->count_area;
1252         for (i = 0; i < 4; i++) {
1253                 ccw[-1].flags |= CCW_FLAG_CC;
1254                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1255                 ccw->flags = 0;
1256                 ccw->count = 8;
1257                 ccw->cda = (__u32)(addr_t) count_data;
1258                 ccw++;
1259                 count_data++;
1260         }
1261
1262         /* Locate record for the first record on track 2. */
1263         ccw[-1].flags |= CCW_FLAG_CC;
1264         locate_record(ccw++, LO_data++, 2, 0, 1,
1265                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1266         /* Read count ccw. */
1267         ccw[-1].flags |= CCW_FLAG_CC;
1268         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1269         ccw->flags = 0;
1270         ccw->count = 8;
1271         ccw->cda = (__u32)(addr_t) count_data;
1272
1273         cqr->block = NULL;
1274         cqr->startdev = device;
1275         cqr->memdev = device;
1276         cqr->retries = 255;
1277         cqr->buildclk = get_clock();
1278         cqr->status = DASD_CQR_FILLED;
1279         return cqr;
1280 }
1281
1282 /* differentiate between 'no record found' and any other error */
1283 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1284 {
1285         char *sense;
1286         if (init_cqr->status == DASD_CQR_DONE)
1287                 return INIT_CQR_OK;
1288         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1289                  init_cqr->status == DASD_CQR_FAILED) {
1290                 sense = dasd_get_sense(&init_cqr->irb);
1291                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1292                         return INIT_CQR_UNFORMATTED;
1293                 else
1294                         return INIT_CQR_ERROR;
1295         } else
1296                 return INIT_CQR_ERROR;
1297 }
1298
1299 /*
1300  * This is the callback function for the init_analysis cqr. It saves
1301  * the status of the initial analysis ccw before it frees it and kicks
1302  * the device to continue the startup sequence. This will call
1303  * dasd_eckd_do_analysis again (if the devices has not been marked
1304  * for deletion in the meantime).
1305  */
1306 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1307                                         void *data)
1308 {
1309         struct dasd_eckd_private *private;
1310         struct dasd_device *device;
1311
1312         device = init_cqr->startdev;
1313         private = (struct dasd_eckd_private *) device->private;
1314         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1315         dasd_sfree_request(init_cqr, device);
1316         dasd_kick_device(device);
1317 }
1318
1319 static int dasd_eckd_start_analysis(struct dasd_block *block)
1320 {
1321         struct dasd_eckd_private *private;
1322         struct dasd_ccw_req *init_cqr;
1323
1324         private = (struct dasd_eckd_private *) block->base->private;
1325         init_cqr = dasd_eckd_analysis_ccw(block->base);
1326         if (IS_ERR(init_cqr))
1327                 return PTR_ERR(init_cqr);
1328         init_cqr->callback = dasd_eckd_analysis_callback;
1329         init_cqr->callback_data = NULL;
1330         init_cqr->expires = 5*HZ;
1331         /* first try without ERP, so we can later handle unformatted
1332          * devices as special case
1333          */
1334         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1335         init_cqr->retries = 0;
1336         dasd_add_request_head(init_cqr);
1337         return -EAGAIN;
1338 }
1339
1340 static int dasd_eckd_end_analysis(struct dasd_block *block)
1341 {
1342         struct dasd_device *device;
1343         struct dasd_eckd_private *private;
1344         struct eckd_count *count_area;
1345         unsigned int sb, blk_per_trk;
1346         int status, i;
1347         struct dasd_ccw_req *init_cqr;
1348
1349         device = block->base;
1350         private = (struct dasd_eckd_private *) device->private;
1351         status = private->init_cqr_status;
1352         private->init_cqr_status = -1;
1353         if (status == INIT_CQR_ERROR) {
1354                 /* try again, this time with full ERP */
1355                 init_cqr = dasd_eckd_analysis_ccw(device);
1356                 dasd_sleep_on(init_cqr);
1357                 status = dasd_eckd_analysis_evaluation(init_cqr);
1358                 dasd_sfree_request(init_cqr, device);
1359         }
1360
1361         if (status == INIT_CQR_UNFORMATTED) {
1362                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1363                 return -EMEDIUMTYPE;
1364         } else if (status == INIT_CQR_ERROR) {
1365                 dev_err(&device->cdev->dev,
1366                         "Detecting the DASD disk layout failed because "
1367                         "of an I/O error\n");
1368                 return -EIO;
1369         }
1370
1371         private->uses_cdl = 1;
1372         /* Check Track 0 for Compatible Disk Layout */
1373         count_area = NULL;
1374         for (i = 0; i < 3; i++) {
1375                 if (private->count_area[i].kl != 4 ||
1376                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
1377                         private->uses_cdl = 0;
1378                         break;
1379                 }
1380         }
1381         if (i == 3)
1382                 count_area = &private->count_area[4];
1383
1384         if (private->uses_cdl == 0) {
1385                 for (i = 0; i < 5; i++) {
1386                         if ((private->count_area[i].kl != 0) ||
1387                             (private->count_area[i].dl !=
1388                              private->count_area[0].dl))
1389                                 break;
1390                 }
1391                 if (i == 5)
1392                         count_area = &private->count_area[0];
1393         } else {
1394                 if (private->count_area[3].record == 1)
1395                         dev_warn(&device->cdev->dev,
1396                                  "Track 0 has no records following the VTOC\n");
1397         }
1398         if (count_area != NULL && count_area->kl == 0) {
1399                 /* we found notthing violating our disk layout */
1400                 if (dasd_check_blocksize(count_area->dl) == 0)
1401                         block->bp_block = count_area->dl;
1402         }
1403         if (block->bp_block == 0) {
1404                 dev_warn(&device->cdev->dev,
1405                          "The disk layout of the DASD is not supported\n");
1406                 return -EMEDIUMTYPE;
1407         }
1408         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1409         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1410                 block->s2b_shift++;
1411
1412         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1413         block->blocks = (private->real_cyl *
1414                           private->rdc_data.trk_per_cyl *
1415                           blk_per_trk);
1416
1417         dev_info(&device->cdev->dev,
1418                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
1419                  "%s\n", (block->bp_block >> 10),
1420                  ((private->real_cyl *
1421                    private->rdc_data.trk_per_cyl *
1422                    blk_per_trk * (block->bp_block >> 9)) >> 1),
1423                  ((blk_per_trk * block->bp_block) >> 10),
1424                  private->uses_cdl ?
1425                  "compatible disk layout" : "linux disk layout");
1426
1427         return 0;
1428 }
1429
1430 static int dasd_eckd_do_analysis(struct dasd_block *block)
1431 {
1432         struct dasd_eckd_private *private;
1433
1434         private = (struct dasd_eckd_private *) block->base->private;
1435         if (private->init_cqr_status < 0)
1436                 return dasd_eckd_start_analysis(block);
1437         else
1438                 return dasd_eckd_end_analysis(block);
1439 }
1440
1441 static int dasd_eckd_ready_to_online(struct dasd_device *device)
1442 {
1443         return dasd_alias_add_device(device);
1444 };
1445
1446 static int dasd_eckd_online_to_ready(struct dasd_device *device)
1447 {
1448         return dasd_alias_remove_device(device);
1449 };
1450
1451 static int
1452 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
1453 {
1454         struct dasd_eckd_private *private;
1455
1456         private = (struct dasd_eckd_private *) block->base->private;
1457         if (dasd_check_blocksize(block->bp_block) == 0) {
1458                 geo->sectors = recs_per_track(&private->rdc_data,
1459                                               0, block->bp_block);
1460         }
1461         geo->cylinders = private->rdc_data.no_cyl;
1462         geo->heads = private->rdc_data.trk_per_cyl;
1463         return 0;
1464 }
1465
1466 static struct dasd_ccw_req *
1467 dasd_eckd_format_device(struct dasd_device * device,
1468                         struct format_data_t * fdata)
1469 {
1470         struct dasd_eckd_private *private;
1471         struct dasd_ccw_req *fcp;
1472         struct eckd_count *ect;
1473         struct ccw1 *ccw;
1474         void *data;
1475         int rpt;
1476         struct ch_t address;
1477         int cplength, datasize;
1478         int i;
1479         int intensity = 0;
1480         int r0_perm;
1481
1482         private = (struct dasd_eckd_private *) device->private;
1483         rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
1484         set_ch_t(&address,
1485                  fdata->start_unit / private->rdc_data.trk_per_cyl,
1486                  fdata->start_unit % private->rdc_data.trk_per_cyl);
1487
1488         /* Sanity checks. */
1489         if (fdata->start_unit >=
1490             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
1491                 dev_warn(&device->cdev->dev, "Start track number %d used in "
1492                          "formatting is too big\n", fdata->start_unit);
1493                 return ERR_PTR(-EINVAL);
1494         }
1495         if (fdata->start_unit > fdata->stop_unit) {
1496                 dev_warn(&device->cdev->dev, "Start track %d used in "
1497                          "formatting exceeds end track\n", fdata->start_unit);
1498                 return ERR_PTR(-EINVAL);
1499         }
1500         if (dasd_check_blocksize(fdata->blksize) != 0) {
1501                 dev_warn(&device->cdev->dev,
1502                          "The DASD cannot be formatted with block size %d\n",
1503                          fdata->blksize);
1504                 return ERR_PTR(-EINVAL);
1505         }
1506
1507         /*
1508          * fdata->intensity is a bit string that tells us what to do:
1509          *   Bit 0: write record zero
1510          *   Bit 1: write home address, currently not supported
1511          *   Bit 2: invalidate tracks
1512          *   Bit 3: use OS/390 compatible disk layout (cdl)
1513          *   Bit 4: do not allow storage subsystem to modify record zero
1514          * Only some bit combinations do make sense.
1515          */
1516         if (fdata->intensity & 0x10) {
1517                 r0_perm = 0;
1518                 intensity = fdata->intensity & ~0x10;
1519         } else {
1520                 r0_perm = 1;
1521                 intensity = fdata->intensity;
1522         }
1523         switch (intensity) {
1524         case 0x00:      /* Normal format */
1525         case 0x08:      /* Normal format, use cdl. */
1526                 cplength = 2 + rpt;
1527                 datasize = sizeof(struct DE_eckd_data) +
1528                         sizeof(struct LO_eckd_data) +
1529                         rpt * sizeof(struct eckd_count);
1530                 break;
1531         case 0x01:      /* Write record zero and format track. */
1532         case 0x09:      /* Write record zero and format track, use cdl. */
1533                 cplength = 3 + rpt;
1534                 datasize = sizeof(struct DE_eckd_data) +
1535                         sizeof(struct LO_eckd_data) +
1536                         sizeof(struct eckd_count) +
1537                         rpt * sizeof(struct eckd_count);
1538                 break;
1539         case 0x04:      /* Invalidate track. */
1540         case 0x0c:      /* Invalidate track, use cdl. */
1541                 cplength = 3;
1542                 datasize = sizeof(struct DE_eckd_data) +
1543                         sizeof(struct LO_eckd_data) +
1544                         sizeof(struct eckd_count);
1545                 break;
1546         default:
1547                 dev_warn(&device->cdev->dev, "An I/O control call used "
1548                          "incorrect flags 0x%x\n", fdata->intensity);
1549                 return ERR_PTR(-EINVAL);
1550         }
1551         /* Allocate the format ccw request. */
1552         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1553         if (IS_ERR(fcp))
1554                 return fcp;
1555
1556         data = fcp->data;
1557         ccw = fcp->cpaddr;
1558
1559         switch (intensity & ~0x08) {
1560         case 0x00: /* Normal format. */
1561                 define_extent(ccw++, (struct DE_eckd_data *) data,
1562                               fdata->start_unit, fdata->start_unit,
1563                               DASD_ECKD_CCW_WRITE_CKD, device);
1564                 /* grant subsystem permission to format R0 */
1565                 if (r0_perm)
1566                         ((struct DE_eckd_data *)data)->ga_extended |= 0x04;
1567                 data += sizeof(struct DE_eckd_data);
1568                 ccw[-1].flags |= CCW_FLAG_CC;
1569                 locate_record(ccw++, (struct LO_eckd_data *) data,
1570                               fdata->start_unit, 0, rpt,
1571                               DASD_ECKD_CCW_WRITE_CKD, device,
1572                               fdata->blksize);
1573                 data += sizeof(struct LO_eckd_data);
1574                 break;
1575         case 0x01: /* Write record zero + format track. */
1576                 define_extent(ccw++, (struct DE_eckd_data *) data,
1577                               fdata->start_unit, fdata->start_unit,
1578                               DASD_ECKD_CCW_WRITE_RECORD_ZERO,
1579                               device);
1580                 data += sizeof(struct DE_eckd_data);
1581                 ccw[-1].flags |= CCW_FLAG_CC;
1582                 locate_record(ccw++, (struct LO_eckd_data *) data,
1583                               fdata->start_unit, 0, rpt + 1,
1584                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
1585                               device->block->bp_block);
1586                 data += sizeof(struct LO_eckd_data);
1587                 break;
1588         case 0x04: /* Invalidate track. */
1589                 define_extent(ccw++, (struct DE_eckd_data *) data,
1590                               fdata->start_unit, fdata->start_unit,
1591                               DASD_ECKD_CCW_WRITE_CKD, device);
1592                 data += sizeof(struct DE_eckd_data);
1593                 ccw[-1].flags |= CCW_FLAG_CC;
1594                 locate_record(ccw++, (struct LO_eckd_data *) data,
1595                               fdata->start_unit, 0, 1,
1596                               DASD_ECKD_CCW_WRITE_CKD, device, 8);
1597                 data += sizeof(struct LO_eckd_data);
1598                 break;
1599         }
1600         if (intensity & 0x01) { /* write record zero */
1601                 ect = (struct eckd_count *) data;
1602                 data += sizeof(struct eckd_count);
1603                 ect->cyl = address.cyl;
1604                 ect->head = address.head;
1605                 ect->record = 0;
1606                 ect->kl = 0;
1607                 ect->dl = 8;
1608                 ccw[-1].flags |= CCW_FLAG_CC;
1609                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
1610                 ccw->flags = CCW_FLAG_SLI;
1611                 ccw->count = 8;
1612                 ccw->cda = (__u32)(addr_t) ect;
1613                 ccw++;
1614         }
1615         if ((intensity & ~0x08) & 0x04) {       /* erase track */
1616                 ect = (struct eckd_count *) data;
1617                 data += sizeof(struct eckd_count);
1618                 ect->cyl = address.cyl;
1619                 ect->head = address.head;
1620                 ect->record = 1;
1621                 ect->kl = 0;
1622                 ect->dl = 0;
1623                 ccw[-1].flags |= CCW_FLAG_CC;
1624                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1625                 ccw->flags = CCW_FLAG_SLI;
1626                 ccw->count = 8;
1627                 ccw->cda = (__u32)(addr_t) ect;
1628         } else {                /* write remaining records */
1629                 for (i = 0; i < rpt; i++) {
1630                         ect = (struct eckd_count *) data;
1631                         data += sizeof(struct eckd_count);
1632                         ect->cyl = address.cyl;
1633                         ect->head = address.head;
1634                         ect->record = i + 1;
1635                         ect->kl = 0;
1636                         ect->dl = fdata->blksize;
1637                         /* Check for special tracks 0-1 when formatting CDL */
1638                         if ((intensity & 0x08) &&
1639                             fdata->start_unit == 0) {
1640                                 if (i < 3) {
1641                                         ect->kl = 4;
1642                                         ect->dl = sizes_trk0[i] - 4;
1643                                 }
1644                         }
1645                         if ((intensity & 0x08) &&
1646                             fdata->start_unit == 1) {
1647                                 ect->kl = 44;
1648                                 ect->dl = LABEL_SIZE - 44;
1649                         }
1650                         ccw[-1].flags |= CCW_FLAG_CC;
1651                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1652                         ccw->flags = CCW_FLAG_SLI;
1653                         ccw->count = 8;
1654                         ccw->cda = (__u32)(addr_t) ect;
1655                         ccw++;
1656                 }
1657         }
1658         fcp->startdev = device;
1659         fcp->memdev = device;
1660         fcp->retries = 256;
1661         fcp->buildclk = get_clock();
1662         fcp->status = DASD_CQR_FILLED;
1663         return fcp;
1664 }
1665
1666 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
1667 {
1668         cqr->status = DASD_CQR_FILLED;
1669         if (cqr->block && (cqr->startdev != cqr->block->base)) {
1670                 dasd_eckd_reset_ccw_to_base_io(cqr);
1671                 cqr->startdev = cqr->block->base;
1672         }
1673 };
1674
1675 static dasd_erp_fn_t
1676 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
1677 {
1678         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
1679         struct ccw_device *cdev = device->cdev;
1680
1681         switch (cdev->id.cu_type) {
1682         case 0x3990:
1683         case 0x2105:
1684         case 0x2107:
1685         case 0x1750:
1686                 return dasd_3990_erp_action;
1687         case 0x9343:
1688         case 0x3880:
1689         default:
1690                 return dasd_default_erp_action;
1691         }
1692 }
1693
1694 static dasd_erp_fn_t
1695 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
1696 {
1697         return dasd_default_erp_postaction;
1698 }
1699
1700
1701 static void dasd_eckd_handle_unsolicited_interrupt(struct dasd_device *device,
1702                                                    struct irb *irb)
1703 {
1704         char mask;
1705         char *sense = NULL;
1706
1707         /* first of all check for state change pending interrupt */
1708         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
1709         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
1710                 dasd_generic_handle_state_change(device);
1711                 return;
1712         }
1713
1714         /* summary unit check */
1715         if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
1716             (irb->ecw[7] == 0x0D)) {
1717                 dasd_alias_handle_summary_unit_check(device, irb);
1718                 return;
1719         }
1720
1721         sense = dasd_get_sense(irb);
1722         /* service information message SIM */
1723         if (sense && !(sense[27] & DASD_SENSE_BIT_0) &&
1724             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
1725                 dasd_3990_erp_handle_sim(device, sense);
1726                 dasd_schedule_device_bh(device);
1727                 return;
1728         }
1729
1730         if ((scsw_cc(&irb->scsw) == 1) &&
1731             (scsw_fctl(&irb->scsw) & SCSW_FCTL_START_FUNC) &&
1732             (scsw_actl(&irb->scsw) & SCSW_ACTL_START_PEND) &&
1733             (scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND)) {
1734                 /* fake irb do nothing, they are handled elsewhere */
1735                 dasd_schedule_device_bh(device);
1736                 return;
1737         }
1738
1739         if (!sense) {
1740                 /* just report other unsolicited interrupts */
1741                 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1742                             "unsolicited interrupt received");
1743         } else {
1744                 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1745                             "unsolicited interrupt received "
1746                             "(sense available)");
1747                 device->discipline->dump_sense_dbf(device, irb, "unsolicited");
1748         }
1749
1750         dasd_schedule_device_bh(device);
1751         return;
1752 };
1753
1754
1755 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
1756                                                struct dasd_device *startdev,
1757                                                struct dasd_block *block,
1758                                                struct request *req,
1759                                                sector_t first_rec,
1760                                                sector_t last_rec,
1761                                                sector_t first_trk,
1762                                                sector_t last_trk,
1763                                                unsigned int first_offs,
1764                                                unsigned int last_offs,
1765                                                unsigned int blk_per_trk,
1766                                                unsigned int blksize)
1767 {
1768         struct dasd_eckd_private *private;
1769         unsigned long *idaws;
1770         struct LO_eckd_data *LO_data;
1771         struct dasd_ccw_req *cqr;
1772         struct ccw1 *ccw;
1773         struct req_iterator iter;
1774         struct bio_vec *bv;
1775         char *dst;
1776         unsigned int off;
1777         int count, cidaw, cplength, datasize;
1778         sector_t recid;
1779         unsigned char cmd, rcmd;
1780         int use_prefix;
1781         struct dasd_device *basedev;
1782
1783         basedev = block->base;
1784         private = (struct dasd_eckd_private *) basedev->private;
1785         if (rq_data_dir(req) == READ)
1786                 cmd = DASD_ECKD_CCW_READ_MT;
1787         else if (rq_data_dir(req) == WRITE)
1788                 cmd = DASD_ECKD_CCW_WRITE_MT;
1789         else
1790                 return ERR_PTR(-EINVAL);
1791
1792         /* Check struct bio and count the number of blocks for the request. */
1793         count = 0;
1794         cidaw = 0;
1795         rq_for_each_segment(bv, req, iter) {
1796                 if (bv->bv_len & (blksize - 1))
1797                         /* Eckd can only do full blocks. */
1798                         return ERR_PTR(-EINVAL);
1799                 count += bv->bv_len >> (block->s2b_shift + 9);
1800 #if defined(CONFIG_64BIT)
1801                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
1802                         cidaw += bv->bv_len >> (block->s2b_shift + 9);
1803 #endif
1804         }
1805         /* Paranoia. */
1806         if (count != last_rec - first_rec + 1)
1807                 return ERR_PTR(-EINVAL);
1808
1809         /* use the prefix command if available */
1810         use_prefix = private->features.feature[8] & 0x01;
1811         if (use_prefix) {
1812                 /* 1x prefix + number of blocks */
1813                 cplength = 2 + count;
1814                 /* 1x prefix + cidaws*sizeof(long) */
1815                 datasize = sizeof(struct PFX_eckd_data) +
1816                         sizeof(struct LO_eckd_data) +
1817                         cidaw * sizeof(unsigned long);
1818         } else {
1819                 /* 1x define extent + 1x locate record + number of blocks */
1820                 cplength = 2 + count;
1821                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
1822                 datasize = sizeof(struct DE_eckd_data) +
1823                         sizeof(struct LO_eckd_data) +
1824                         cidaw * sizeof(unsigned long);
1825         }
1826         /* Find out the number of additional locate record ccws for cdl. */
1827         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
1828                 if (last_rec >= 2*blk_per_trk)
1829                         count = 2*blk_per_trk - first_rec;
1830                 cplength += count;
1831                 datasize += count*sizeof(struct LO_eckd_data);
1832         }
1833         /* Allocate the ccw request. */
1834         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
1835                                    startdev);
1836         if (IS_ERR(cqr))
1837                 return cqr;
1838         ccw = cqr->cpaddr;
1839         /* First ccw is define extent or prefix. */
1840         if (use_prefix) {
1841                 if (prefix(ccw++, cqr->data, first_trk,
1842                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
1843                         /* Clock not in sync and XRC is enabled.
1844                          * Try again later.
1845                          */
1846                         dasd_sfree_request(cqr, startdev);
1847                         return ERR_PTR(-EAGAIN);
1848                 }
1849                 idaws = (unsigned long *) (cqr->data +
1850                                            sizeof(struct PFX_eckd_data));
1851         } else {
1852                 if (define_extent(ccw++, cqr->data, first_trk,
1853                                   last_trk, cmd, startdev) == -EAGAIN) {
1854                         /* Clock not in sync and XRC is enabled.
1855                          * Try again later.
1856                          */
1857                         dasd_sfree_request(cqr, startdev);
1858                         return ERR_PTR(-EAGAIN);
1859                 }
1860                 idaws = (unsigned long *) (cqr->data +
1861                                            sizeof(struct DE_eckd_data));
1862         }
1863         /* Build locate_record+read/write/ccws. */
1864         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
1865         recid = first_rec;
1866         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
1867                 /* Only standard blocks so there is just one locate record. */
1868                 ccw[-1].flags |= CCW_FLAG_CC;
1869                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
1870                               last_rec - recid + 1, cmd, basedev, blksize);
1871         }
1872         rq_for_each_segment(bv, req, iter) {
1873                 dst = page_address(bv->bv_page) + bv->bv_offset;
1874                 if (dasd_page_cache) {
1875                         char *copy = kmem_cache_alloc(dasd_page_cache,
1876                                                       GFP_DMA | __GFP_NOWARN);
1877                         if (copy && rq_data_dir(req) == WRITE)
1878                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
1879                         if (copy)
1880                                 dst = copy + bv->bv_offset;
1881                 }
1882                 for (off = 0; off < bv->bv_len; off += blksize) {
1883                         sector_t trkid = recid;
1884                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
1885                         rcmd = cmd;
1886                         count = blksize;
1887                         /* Locate record for cdl special block ? */
1888                         if (private->uses_cdl && recid < 2*blk_per_trk) {
1889                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
1890                                         rcmd |= 0x8;
1891                                         count = dasd_eckd_cdl_reclen(recid);
1892                                         if (count < blksize &&
1893                                             rq_data_dir(req) == READ)
1894                                                 memset(dst + count, 0xe5,
1895                                                        blksize - count);
1896                                 }
1897                                 ccw[-1].flags |= CCW_FLAG_CC;
1898                                 locate_record(ccw++, LO_data++,
1899                                               trkid, recoffs + 1,
1900                                               1, rcmd, basedev, count);
1901                         }
1902                         /* Locate record for standard blocks ? */
1903                         if (private->uses_cdl && recid == 2*blk_per_trk) {
1904                                 ccw[-1].flags |= CCW_FLAG_CC;
1905                                 locate_record(ccw++, LO_data++,
1906                                               trkid, recoffs + 1,
1907                                               last_rec - recid + 1,
1908                                               cmd, basedev, count);
1909                         }
1910                         /* Read/write ccw. */
1911                         ccw[-1].flags |= CCW_FLAG_CC;
1912                         ccw->cmd_code = rcmd;
1913                         ccw->count = count;
1914                         if (idal_is_needed(dst, blksize)) {
1915                                 ccw->cda = (__u32)(addr_t) idaws;
1916                                 ccw->flags = CCW_FLAG_IDA;
1917                                 idaws = idal_create_words(idaws, dst, blksize);
1918                         } else {
1919                                 ccw->cda = (__u32)(addr_t) dst;
1920                                 ccw->flags = 0;
1921                         }
1922                         ccw++;
1923                         dst += blksize;
1924                         recid++;
1925                 }
1926         }
1927         if (blk_noretry_request(req) ||
1928             block->base->features & DASD_FEATURE_FAILFAST)
1929                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1930         cqr->startdev = startdev;
1931         cqr->memdev = startdev;
1932         cqr->block = block;
1933         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
1934         cqr->lpm = private->path_data.ppm;
1935         cqr->retries = 256;
1936         cqr->buildclk = get_clock();
1937         cqr->status = DASD_CQR_FILLED;
1938         return cqr;
1939 }
1940
1941 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
1942                                                struct dasd_device *startdev,
1943                                                struct dasd_block *block,
1944                                                struct request *req,
1945                                                sector_t first_rec,
1946                                                sector_t last_rec,
1947                                                sector_t first_trk,
1948                                                sector_t last_trk,
1949                                                unsigned int first_offs,
1950                                                unsigned int last_offs,
1951                                                unsigned int blk_per_trk,
1952                                                unsigned int blksize)
1953 {
1954         struct dasd_eckd_private *private;
1955         unsigned long *idaws;
1956         struct dasd_ccw_req *cqr;
1957         struct ccw1 *ccw;
1958         struct req_iterator iter;
1959         struct bio_vec *bv;
1960         char *dst, *idaw_dst;
1961         unsigned int cidaw, cplength, datasize;
1962         unsigned int tlf;
1963         sector_t recid;
1964         unsigned char cmd;
1965         struct dasd_device *basedev;
1966         unsigned int trkcount, count, count_to_trk_end;
1967         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
1968         unsigned char new_track, end_idaw;
1969         sector_t trkid;
1970         unsigned int recoffs;
1971
1972         basedev = block->base;
1973         private = (struct dasd_eckd_private *) basedev->private;
1974         if (rq_data_dir(req) == READ)
1975                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
1976         else if (rq_data_dir(req) == WRITE)
1977                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
1978         else
1979                 return ERR_PTR(-EINVAL);
1980
1981         /* Track based I/O needs IDAWs for each page, and not just for
1982          * 64 bit addresses. We need additional idals for pages
1983          * that get filled from two tracks, so we use the number
1984          * of records as upper limit.
1985          */
1986         cidaw = last_rec - first_rec + 1;
1987         trkcount = last_trk - first_trk + 1;
1988
1989         /* 1x prefix + one read/write ccw per track */
1990         cplength = 1 + trkcount;
1991
1992         /* on 31-bit we need space for two 32 bit addresses per page
1993          * on 64-bit one 64 bit address
1994          */
1995         datasize = sizeof(struct PFX_eckd_data) +
1996                 cidaw * sizeof(unsigned long long);
1997
1998         /* Allocate the ccw request. */
1999         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2000                                    startdev);
2001         if (IS_ERR(cqr))
2002                 return cqr;
2003         ccw = cqr->cpaddr;
2004         /* transfer length factor: how many bytes to read from the last track */
2005         if (first_trk == last_trk)
2006                 tlf = last_offs - first_offs + 1;
2007         else
2008                 tlf = last_offs + 1;
2009         tlf *= blksize;
2010
2011         if (prefix_LRE(ccw++, cqr->data, first_trk,
2012                        last_trk, cmd, basedev, startdev,
2013                        1 /* format */, first_offs + 1,
2014                        trkcount, blksize,
2015                        tlf) == -EAGAIN) {
2016                 /* Clock not in sync and XRC is enabled.
2017                  * Try again later.
2018                  */
2019                 dasd_sfree_request(cqr, startdev);
2020                 return ERR_PTR(-EAGAIN);
2021         }
2022
2023         /*
2024          * The translation of request into ccw programs must meet the
2025          * following conditions:
2026          * - all idaws but the first and the last must address full pages
2027          *   (or 2K blocks on 31-bit)
2028          * - the scope of a ccw and it's idal ends with the track boundaries
2029          */
2030         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2031         recid = first_rec;
2032         new_track = 1;
2033         end_idaw = 0;
2034         len_to_track_end = 0;
2035         idaw_dst = 0;
2036         idaw_len = 0;
2037         rq_for_each_segment(bv, req, iter) {
2038                 dst = page_address(bv->bv_page) + bv->bv_offset;
2039                 seg_len = bv->bv_len;
2040                 while (seg_len) {
2041                         if (new_track) {
2042                                 trkid = recid;
2043                                 recoffs = sector_div(trkid, blk_per_trk);
2044                                 count_to_trk_end = blk_per_trk - recoffs;
2045                                 count = min((last_rec - recid + 1),
2046                                             (sector_t)count_to_trk_end);
2047                                 len_to_track_end = count * blksize;
2048                                 ccw[-1].flags |= CCW_FLAG_CC;
2049                                 ccw->cmd_code = cmd;
2050                                 ccw->count = len_to_track_end;
2051                                 ccw->cda = (__u32)(addr_t)idaws;
2052                                 ccw->flags = CCW_FLAG_IDA;
2053                                 ccw++;
2054                                 recid += count;
2055                                 new_track = 0;
2056                                 /* first idaw for a ccw may start anywhere */
2057                                 if (!idaw_dst)
2058                                         idaw_dst = dst;
2059                         }
2060                         /* If we start a new idaw, we must make sure that it
2061                          * starts on an IDA_BLOCK_SIZE boundary.
2062                          * If we continue an idaw, we must make sure that the
2063                          * current segment begins where the so far accumulated
2064                          * idaw ends
2065                          */
2066                         if (!idaw_dst) {
2067                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2068                                         dasd_sfree_request(cqr, startdev);
2069                                         return ERR_PTR(-ERANGE);
2070                                 } else
2071                                         idaw_dst = dst;
2072                         }
2073                         if ((idaw_dst + idaw_len) != dst) {
2074                                 dasd_sfree_request(cqr, startdev);
2075                                 return ERR_PTR(-ERANGE);
2076                         }
2077                         part_len = min(seg_len, len_to_track_end);
2078                         seg_len -= part_len;
2079                         dst += part_len;
2080                         idaw_len += part_len;
2081                         len_to_track_end -= part_len;
2082                         /* collected memory area ends on an IDA_BLOCK border,
2083                          * -> create an idaw
2084                          * idal_create_words will handle cases where idaw_len
2085                          * is larger then IDA_BLOCK_SIZE
2086                          */
2087                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2088                                 end_idaw = 1;
2089                         /* We also need to end the idaw at track end */
2090                         if (!len_to_track_end) {
2091                                 new_track = 1;
2092                                 end_idaw = 1;
2093                         }
2094                         if (end_idaw) {
2095                                 idaws = idal_create_words(idaws, idaw_dst,
2096                                                           idaw_len);
2097                                 idaw_dst = 0;
2098                                 idaw_len = 0;
2099                                 end_idaw = 0;
2100                         }
2101                 }
2102         }
2103
2104         if (blk_noretry_request(req) ||
2105             block->base->features & DASD_FEATURE_FAILFAST)
2106                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2107         cqr->startdev = startdev;
2108         cqr->memdev = startdev;
2109         cqr->block = block;
2110         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
2111         cqr->lpm = private->path_data.ppm;
2112         cqr->retries = 256;
2113         cqr->buildclk = get_clock();
2114         cqr->status = DASD_CQR_FILLED;
2115         return cqr;
2116 }
2117
2118 static int prepare_itcw(struct itcw *itcw,
2119                         unsigned int trk, unsigned int totrk, int cmd,
2120                         struct dasd_device *basedev,
2121                         struct dasd_device *startdev,
2122                         unsigned int rec_on_trk, int count,
2123                         unsigned int blksize,
2124                         unsigned int total_data_size,
2125                         unsigned int tlf,
2126                         unsigned int blk_per_trk)
2127 {
2128         struct PFX_eckd_data pfxdata;
2129         struct dasd_eckd_private *basepriv, *startpriv;
2130         struct DE_eckd_data *dedata;
2131         struct LRE_eckd_data *lredata;
2132         struct dcw *dcw;
2133
2134         u32 begcyl, endcyl;
2135         u16 heads, beghead, endhead;
2136         u8 pfx_cmd;
2137
2138         int rc = 0;
2139         int sector = 0;
2140         int dn, d;
2141
2142
2143         /* setup prefix data */
2144         basepriv = (struct dasd_eckd_private *) basedev->private;
2145         startpriv = (struct dasd_eckd_private *) startdev->private;
2146         dedata = &pfxdata.define_extent;
2147         lredata = &pfxdata.locate_record;
2148
2149         memset(&pfxdata, 0, sizeof(pfxdata));
2150         pfxdata.format = 1; /* PFX with LRE */
2151         pfxdata.base_address = basepriv->ned->unit_addr;
2152         pfxdata.base_lss = basepriv->ned->ID;
2153         pfxdata.validity.define_extent = 1;
2154
2155         /* private uid is kept up to date, conf_data may be outdated */
2156         if (startpriv->uid.type != UA_BASE_DEVICE) {
2157                 pfxdata.validity.verify_base = 1;
2158                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2159                         pfxdata.validity.hyper_pav = 1;
2160         }
2161
2162         switch (cmd) {
2163         case DASD_ECKD_CCW_READ_TRACK_DATA:
2164                 dedata->mask.perm = 0x1;
2165                 dedata->attributes.operation = basepriv->attrib.operation;
2166                 dedata->blk_size = blksize;
2167                 dedata->ga_extended |= 0x42;
2168                 lredata->operation.orientation = 0x0;
2169                 lredata->operation.operation = 0x0C;
2170                 lredata->auxiliary.check_bytes = 0x01;
2171                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2172                 break;
2173         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2174                 dedata->mask.perm = 0x02;
2175                 dedata->attributes.operation = basepriv->attrib.operation;
2176                 dedata->blk_size = blksize;
2177                 rc = check_XRC_on_prefix(&pfxdata, basedev);
2178                 dedata->ga_extended |= 0x42;
2179                 lredata->operation.orientation = 0x0;
2180                 lredata->operation.operation = 0x3F;
2181                 lredata->extended_operation = 0x23;
2182                 lredata->auxiliary.check_bytes = 0x2;
2183                 pfx_cmd = DASD_ECKD_CCW_PFX;
2184                 break;
2185         default:
2186                 DBF_DEV_EVENT(DBF_ERR, basedev,
2187                               "prepare itcw, unknown opcode 0x%x", cmd);
2188                 BUG();
2189                 break;
2190         }
2191         if (rc)
2192                 return rc;
2193
2194         dedata->attributes.mode = 0x3;  /* ECKD */
2195
2196         heads = basepriv->rdc_data.trk_per_cyl;
2197         begcyl = trk / heads;
2198         beghead = trk % heads;
2199         endcyl = totrk / heads;
2200         endhead = totrk % heads;
2201
2202         /* check for sequential prestage - enhance cylinder range */
2203         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2204             dedata->attributes.operation == DASD_SEQ_ACCESS) {
2205
2206                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2207                         endcyl += basepriv->attrib.nr_cyl;
2208                 else
2209                         endcyl = (basepriv->real_cyl - 1);
2210         }
2211
2212         set_ch_t(&dedata->beg_ext, begcyl, beghead);
2213         set_ch_t(&dedata->end_ext, endcyl, endhead);
2214
2215         dedata->ep_format = 0x20; /* records per track is valid */
2216         dedata->ep_rec_per_track = blk_per_trk;
2217
2218         if (rec_on_trk) {
2219                 switch (basepriv->rdc_data.dev_type) {
2220                 case 0x3390:
2221                         dn = ceil_quot(blksize + 6, 232);
2222                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
2223                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
2224                         break;
2225                 case 0x3380:
2226                         d = 7 + ceil_quot(blksize + 12, 32);
2227                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
2228                         break;
2229                 }
2230         }
2231
2232         lredata->auxiliary.length_valid = 1;
2233         lredata->auxiliary.length_scope = 1;
2234         lredata->auxiliary.imbedded_ccw_valid = 1;
2235         lredata->length = tlf;
2236         lredata->imbedded_ccw = cmd;
2237         lredata->count = count;
2238         lredata->sector = sector;
2239         set_ch_t(&lredata->seek_addr, begcyl, beghead);
2240         lredata->search_arg.cyl = lredata->seek_addr.cyl;
2241         lredata->search_arg.head = lredata->seek_addr.head;
2242         lredata->search_arg.record = rec_on_trk;
2243
2244         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
2245                      &pfxdata, sizeof(pfxdata), total_data_size);
2246
2247         return rc;
2248 }
2249
2250 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
2251                                                struct dasd_device *startdev,
2252                                                struct dasd_block *block,
2253                                                struct request *req,
2254                                                sector_t first_rec,
2255                                                sector_t last_rec,
2256                                                sector_t first_trk,
2257                                                sector_t last_trk,
2258                                                unsigned int first_offs,
2259                                                unsigned int last_offs,
2260                                                unsigned int blk_per_trk,
2261                                                unsigned int blksize)
2262 {
2263         struct dasd_eckd_private *private;
2264         struct dasd_ccw_req *cqr;
2265         struct req_iterator iter;
2266         struct bio_vec *bv;
2267         char *dst;
2268         unsigned int trkcount, ctidaw;
2269         unsigned char cmd;
2270         struct dasd_device *basedev;
2271         unsigned int tlf;
2272         struct itcw *itcw;
2273         struct tidaw *last_tidaw = NULL;
2274         int itcw_op;
2275         size_t itcw_size;
2276
2277         basedev = block->base;
2278         private = (struct dasd_eckd_private *) basedev->private;
2279         if (rq_data_dir(req) == READ) {
2280                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2281                 itcw_op = ITCW_OP_READ;
2282         } else if (rq_data_dir(req) == WRITE) {
2283                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2284                 itcw_op = ITCW_OP_WRITE;
2285         } else
2286                 return ERR_PTR(-EINVAL);
2287
2288         /* trackbased I/O needs address all memory via TIDAWs,
2289          * not just for 64 bit addresses. This allows us to map
2290          * each segment directly to one tidaw.
2291          */
2292         trkcount = last_trk - first_trk + 1;
2293         ctidaw = 0;
2294         rq_for_each_segment(bv, req, iter) {
2295                 ++ctidaw;
2296         }
2297
2298         /* Allocate the ccw request. */
2299         itcw_size = itcw_calc_size(0, ctidaw, 0);
2300         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2301         if (IS_ERR(cqr))
2302                 return cqr;
2303
2304         cqr->cpmode = 1;
2305         cqr->startdev = startdev;
2306         cqr->memdev = startdev;
2307         cqr->block = block;
2308         cqr->expires = 100*HZ;
2309         cqr->buildclk = get_clock();
2310         cqr->status = DASD_CQR_FILLED;
2311         cqr->retries = 10;
2312
2313         /* transfer length factor: how many bytes to read from the last track */
2314         if (first_trk == last_trk)
2315                 tlf = last_offs - first_offs + 1;
2316         else
2317                 tlf = last_offs + 1;
2318         tlf *= blksize;
2319
2320         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
2321         cqr->cpaddr = itcw_get_tcw(itcw);
2322
2323         if (prepare_itcw(itcw, first_trk, last_trk,
2324                          cmd, basedev, startdev,
2325                          first_offs + 1,
2326                          trkcount, blksize,
2327                          (last_rec - first_rec + 1) * blksize,
2328                          tlf, blk_per_trk) == -EAGAIN) {
2329                 /* Clock not in sync and XRC is enabled.
2330                  * Try again later.
2331                  */
2332                 dasd_sfree_request(cqr, startdev);
2333                 return ERR_PTR(-EAGAIN);
2334         }
2335
2336         /*
2337          * A tidaw can address 4k of memory, but must not cross page boundaries
2338          * We can let the block layer handle this by setting
2339          * blk_queue_segment_boundary to page boundaries and
2340          * blk_max_segment_size to page size when setting up the request queue.
2341          */
2342         rq_for_each_segment(bv, req, iter) {
2343                 dst = page_address(bv->bv_page) + bv->bv_offset;
2344                 last_tidaw = itcw_add_tidaw(itcw, 0x00, dst, bv->bv_len);
2345                 if (IS_ERR(last_tidaw))
2346                         return (struct dasd_ccw_req *)last_tidaw;
2347         }
2348
2349         last_tidaw->flags |= 0x80;
2350         itcw_finalize(itcw);
2351
2352         if (blk_noretry_request(req) ||
2353             block->base->features & DASD_FEATURE_FAILFAST)
2354                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2355         cqr->startdev = startdev;
2356         cqr->memdev = startdev;
2357         cqr->block = block;
2358         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
2359         cqr->lpm = private->path_data.ppm;
2360         cqr->retries = 256;
2361         cqr->buildclk = get_clock();
2362         cqr->status = DASD_CQR_FILLED;
2363         return cqr;
2364 }
2365
2366 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
2367                                                struct dasd_block *block,
2368                                                struct request *req)
2369 {
2370         int tpm, cmdrtd, cmdwtd;
2371         int use_prefix;
2372 #if defined(CONFIG_64BIT)
2373         int fcx_in_css, fcx_in_gneq, fcx_in_features;
2374 #endif
2375         struct dasd_eckd_private *private;
2376         struct dasd_device *basedev;
2377         sector_t first_rec, last_rec;
2378         sector_t first_trk, last_trk;
2379         unsigned int first_offs, last_offs;
2380         unsigned int blk_per_trk, blksize;
2381         int cdlspecial;
2382         struct dasd_ccw_req *cqr;
2383
2384         basedev = block->base;
2385         private = (struct dasd_eckd_private *) basedev->private;
2386
2387         /* Calculate number of blocks/records per track. */
2388         blksize = block->bp_block;
2389         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2390         if (blk_per_trk == 0)
2391                 return ERR_PTR(-EINVAL);
2392         /* Calculate record id of first and last block. */
2393         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
2394         first_offs = sector_div(first_trk, blk_per_trk);
2395         last_rec = last_trk =
2396                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
2397         last_offs = sector_div(last_trk, blk_per_trk);
2398         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
2399
2400         /* is transport mode supported? */
2401 #if defined(CONFIG_64BIT)
2402         fcx_in_css = css_general_characteristics.fcx;
2403         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
2404         fcx_in_features = private->features.feature[40] & 0x80;
2405         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
2406 #else
2407         tpm = 0;
2408 #endif
2409
2410         /* is read track data and write track data in command mode supported? */
2411         cmdrtd = private->features.feature[9] & 0x20;
2412         cmdwtd = private->features.feature[12] & 0x40;
2413         use_prefix = private->features.feature[8] & 0x01;
2414
2415         cqr = NULL;
2416         if (cdlspecial || dasd_page_cache) {
2417                 /* do nothing, just fall through to the cmd mode single case */
2418         } else if (!dasd_nofcx && tpm && (first_trk == last_trk)) {
2419                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
2420                                                     first_rec, last_rec,
2421                                                     first_trk, last_trk,
2422                                                     first_offs, last_offs,
2423                                                     blk_per_trk, blksize);
2424                 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
2425                         cqr = NULL;
2426         } else if (use_prefix &&
2427                    (((rq_data_dir(req) == READ) && cmdrtd) ||
2428                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
2429                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
2430                                                    first_rec, last_rec,
2431                                                    first_trk, last_trk,
2432                                                    first_offs, last_offs,
2433                                                    blk_per_trk, blksize);
2434                 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
2435                         cqr = NULL;
2436         }
2437         if (!cqr)
2438                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
2439                                                     first_rec, last_rec,
2440                                                     first_trk, last_trk,
2441                                                     first_offs, last_offs,
2442                                                     blk_per_trk, blksize);
2443         return cqr;
2444 }
2445
2446 static int
2447 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
2448 {
2449         struct dasd_eckd_private *private;
2450         struct ccw1 *ccw;
2451         struct req_iterator iter;
2452         struct bio_vec *bv;
2453         char *dst, *cda;
2454         unsigned int blksize, blk_per_trk, off;
2455         sector_t recid;
2456         int status;
2457
2458         if (!dasd_page_cache)
2459                 goto out;
2460         private = (struct dasd_eckd_private *) cqr->block->base->private;
2461         blksize = cqr->block->bp_block;
2462         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2463         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
2464         ccw = cqr->cpaddr;
2465         /* Skip over define extent & locate record. */
2466         ccw++;
2467         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
2468                 ccw++;
2469         rq_for_each_segment(bv, req, iter) {
2470                 dst = page_address(bv->bv_page) + bv->bv_offset;
2471                 for (off = 0; off < bv->bv_len; off += blksize) {
2472                         /* Skip locate record. */
2473                         if (private->uses_cdl && recid <= 2*blk_per_trk)
2474                                 ccw++;
2475                         if (dst) {
2476                                 if (ccw->flags & CCW_FLAG_IDA)
2477                                         cda = *((char **)((addr_t) ccw->cda));
2478                                 else
2479                                         cda = (char *)((addr_t) ccw->cda);
2480                                 if (dst != cda) {
2481                                         if (rq_data_dir(req) == READ)
2482                                                 memcpy(dst, cda, bv->bv_len);
2483                                         kmem_cache_free(dasd_page_cache,
2484                                             (void *)((addr_t)cda & PAGE_MASK));
2485                                 }
2486                                 dst = NULL;
2487                         }
2488                         ccw++;
2489                         recid++;
2490                 }
2491         }
2492 out:
2493         status = cqr->status == DASD_CQR_DONE;
2494         dasd_sfree_request(cqr, cqr->memdev);
2495         return status;
2496 }
2497
2498 /*
2499  * Modify ccw/tcw in cqr so it can be started on a base device.
2500  *
2501  * Note that this is not enough to restart the cqr!
2502  * Either reset cqr->startdev as well (summary unit check handling)
2503  * or restart via separate cqr (as in ERP handling).
2504  */
2505 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
2506 {
2507         struct ccw1 *ccw;
2508         struct PFX_eckd_data *pfxdata;
2509         struct tcw *tcw;
2510         struct tccb *tccb;
2511         struct dcw *dcw;
2512
2513         if (cqr->cpmode == 1) {
2514                 tcw = cqr->cpaddr;
2515                 tccb = tcw_get_tccb(tcw);
2516                 dcw = (struct dcw *)&tccb->tca[0];
2517                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
2518                 pfxdata->validity.verify_base = 0;
2519                 pfxdata->validity.hyper_pav = 0;
2520         } else {
2521                 ccw = cqr->cpaddr;
2522                 pfxdata = cqr->data;
2523                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
2524                         pfxdata->validity.verify_base = 0;
2525                         pfxdata->validity.hyper_pav = 0;
2526                 }
2527         }
2528 }
2529
2530 #define DASD_ECKD_CHANQ_MAX_SIZE 4
2531
2532 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
2533                                                      struct dasd_block *block,
2534                                                      struct request *req)
2535 {
2536         struct dasd_eckd_private *private;
2537         struct dasd_device *startdev;
2538         unsigned long flags;
2539         struct dasd_ccw_req *cqr;
2540
2541         startdev = dasd_alias_get_start_dev(base);
2542         if (!startdev)
2543                 startdev = base;
2544         private = (struct dasd_eckd_private *) startdev->private;
2545         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
2546                 return ERR_PTR(-EBUSY);
2547
2548         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
2549         private->count++;
2550         cqr = dasd_eckd_build_cp(startdev, block, req);
2551         if (IS_ERR(cqr))
2552                 private->count--;
2553         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
2554         return cqr;
2555 }
2556
2557 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
2558                                    struct request *req)
2559 {
2560         struct dasd_eckd_private *private;
2561         unsigned long flags;
2562
2563         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
2564         private = (struct dasd_eckd_private *) cqr->memdev->private;
2565         private->count--;
2566         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
2567         return dasd_eckd_free_cp(cqr, req);
2568 }
2569
2570 static int
2571 dasd_eckd_fill_info(struct dasd_device * device,
2572                     struct dasd_information2_t * info)
2573 {
2574         struct dasd_eckd_private *private;
2575
2576         private = (struct dasd_eckd_private *) device->private;
2577         info->label_block = 2;
2578         info->FBA_layout = private->uses_cdl ? 0 : 1;
2579         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
2580         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
2581         memcpy(info->characteristics, &private->rdc_data,
2582                sizeof(struct dasd_eckd_characteristics));
2583         info->confdata_size = min((unsigned long)private->conf_len,
2584                                   sizeof(info->configuration_data));
2585         memcpy(info->configuration_data, private->conf_data,
2586                info->confdata_size);
2587         return 0;
2588 }
2589
2590 /*
2591  * SECTION: ioctl functions for eckd devices.
2592  */
2593
2594 /*
2595  * Release device ioctl.
2596  * Buils a channel programm to releases a prior reserved
2597  * (see dasd_eckd_reserve) device.
2598  */
2599 static int
2600 dasd_eckd_release(struct dasd_device *device)
2601 {
2602         struct dasd_ccw_req *cqr;
2603         int rc;
2604         struct ccw1 *ccw;
2605
2606         if (!capable(CAP_SYS_ADMIN))
2607                 return -EACCES;
2608
2609         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
2610         if (IS_ERR(cqr)) {
2611                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2612                             "Could not allocate initialization request");
2613                 return PTR_ERR(cqr);
2614         }
2615         ccw = cqr->cpaddr;
2616         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
2617         ccw->flags |= CCW_FLAG_SLI;
2618         ccw->count = 32;
2619         ccw->cda = (__u32)(addr_t) cqr->data;
2620         cqr->startdev = device;
2621         cqr->memdev = device;
2622         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2623         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2624         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2625         cqr->expires = 2 * HZ;
2626         cqr->buildclk = get_clock();
2627         cqr->status = DASD_CQR_FILLED;
2628
2629         rc = dasd_sleep_on_immediatly(cqr);
2630
2631         dasd_sfree_request(cqr, cqr->memdev);
2632         return rc;
2633 }
2634
2635 /*
2636  * Reserve device ioctl.
2637  * Options are set to 'synchronous wait for interrupt' and
2638  * 'timeout the request'. This leads to a terminate IO if
2639  * the interrupt is outstanding for a certain time.
2640  */
2641 static int
2642 dasd_eckd_reserve(struct dasd_device *device)
2643 {
2644         struct dasd_ccw_req *cqr;
2645         int rc;
2646         struct ccw1 *ccw;
2647
2648         if (!capable(CAP_SYS_ADMIN))
2649                 return -EACCES;
2650
2651         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
2652         if (IS_ERR(cqr)) {
2653                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2654                             "Could not allocate initialization request");
2655                 return PTR_ERR(cqr);
2656         }
2657         ccw = cqr->cpaddr;
2658         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
2659         ccw->flags |= CCW_FLAG_SLI;
2660         ccw->count = 32;
2661         ccw->cda = (__u32)(addr_t) cqr->data;
2662         cqr->startdev = device;
2663         cqr->memdev = device;
2664         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2665         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2666         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2667         cqr->expires = 2 * HZ;
2668         cqr->buildclk = get_clock();
2669         cqr->status = DASD_CQR_FILLED;
2670
2671         rc = dasd_sleep_on_immediatly(cqr);
2672
2673         dasd_sfree_request(cqr, cqr->memdev);
2674         return rc;
2675 }
2676
2677 /*
2678  * Steal lock ioctl - unconditional reserve device.
2679  * Buils a channel programm to break a device's reservation.
2680  * (unconditional reserve)
2681  */
2682 static int
2683 dasd_eckd_steal_lock(struct dasd_device *device)
2684 {
2685         struct dasd_ccw_req *cqr;
2686         int rc;
2687         struct ccw1 *ccw;
2688
2689         if (!capable(CAP_SYS_ADMIN))
2690                 return -EACCES;
2691
2692         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
2693         if (IS_ERR(cqr)) {
2694                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2695                             "Could not allocate initialization request");
2696                 return PTR_ERR(cqr);
2697         }
2698         ccw = cqr->cpaddr;
2699         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
2700         ccw->flags |= CCW_FLAG_SLI;
2701         ccw->count = 32;
2702         ccw->cda = (__u32)(addr_t) cqr->data;
2703         cqr->startdev = device;
2704         cqr->memdev = device;
2705         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2706         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2707         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2708         cqr->expires = 2 * HZ;
2709         cqr->buildclk = get_clock();
2710         cqr->status = DASD_CQR_FILLED;
2711
2712         rc = dasd_sleep_on_immediatly(cqr);
2713
2714         dasd_sfree_request(cqr, cqr->memdev);
2715         return rc;
2716 }
2717
2718 /*
2719  * Read performance statistics
2720  */
2721 static int
2722 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
2723 {
2724         struct dasd_psf_prssd_data *prssdp;
2725         struct dasd_rssd_perf_stats_t *stats;
2726         struct dasd_ccw_req *cqr;
2727         struct ccw1 *ccw;
2728         int rc;
2729
2730         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
2731                                    (sizeof(struct dasd_psf_prssd_data) +
2732                                     sizeof(struct dasd_rssd_perf_stats_t)),
2733                                    device);
2734         if (IS_ERR(cqr)) {
2735                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2736                             "Could not allocate initialization request");
2737                 return PTR_ERR(cqr);
2738         }
2739         cqr->startdev = device;
2740         cqr->memdev = device;
2741         cqr->retries = 0;
2742         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2743         cqr->expires = 10 * HZ;
2744
2745         /* Prepare for Read Subsystem Data */
2746         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
2747         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
2748         prssdp->order = PSF_ORDER_PRSSD;
2749         prssdp->suborder = 0x01;        /* Performance Statistics */
2750         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
2751
2752         ccw = cqr->cpaddr;
2753         ccw->cmd_code = DASD_ECKD_CCW_PSF;
2754         ccw->count = sizeof(struct dasd_psf_prssd_data);
2755         ccw->flags |= CCW_FLAG_CC;
2756         ccw->cda = (__u32)(addr_t) prssdp;
2757
2758         /* Read Subsystem Data - Performance Statistics */
2759         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
2760         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
2761
2762         ccw++;
2763         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
2764         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
2765         ccw->cda = (__u32)(addr_t) stats;
2766
2767         cqr->buildclk = get_clock();
2768         cqr->status = DASD_CQR_FILLED;
2769         rc = dasd_sleep_on(cqr);
2770         if (rc == 0) {
2771                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
2772                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
2773                 if (copy_to_user(argp, stats,
2774                                  sizeof(struct dasd_rssd_perf_stats_t)))
2775                         rc = -EFAULT;
2776         }
2777         dasd_sfree_request(cqr, cqr->memdev);
2778         return rc;
2779 }
2780
2781 /*
2782  * Get attributes (cache operations)
2783  * Returnes the cache attributes used in Define Extend (DE).
2784  */
2785 static int
2786 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
2787 {
2788         struct dasd_eckd_private *private =
2789                 (struct dasd_eckd_private *)device->private;
2790         struct attrib_data_t attrib = private->attrib;
2791         int rc;
2792
2793         if (!capable(CAP_SYS_ADMIN))
2794                 return -EACCES;
2795         if (!argp)
2796                 return -EINVAL;
2797
2798         rc = 0;
2799         if (copy_to_user(argp, (long *) &attrib,
2800                          sizeof(struct attrib_data_t)))
2801                 rc = -EFAULT;
2802
2803         return rc;
2804 }
2805
2806 /*
2807  * Set attributes (cache operations)
2808  * Stores the attributes for cache operation to be used in Define Extend (DE).
2809  */
2810 static int
2811 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
2812 {
2813         struct dasd_eckd_private *private =
2814                 (struct dasd_eckd_private *)device->private;
2815         struct attrib_data_t attrib;
2816
2817         if (!capable(CAP_SYS_ADMIN))
2818                 return -EACCES;
2819         if (!argp)
2820                 return -EINVAL;
2821
2822         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
2823                 return -EFAULT;
2824         private->attrib = attrib;
2825
2826         dev_info(&device->cdev->dev,
2827                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
2828                  private->attrib.operation, private->attrib.nr_cyl);
2829         return 0;
2830 }
2831
2832 /*
2833  * Issue syscall I/O to EMC Symmetrix array.
2834  * CCWs are PSF and RSSD
2835  */
2836 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
2837 {
2838         struct dasd_symmio_parms usrparm;
2839         char *psf_data, *rssd_result;
2840         struct dasd_ccw_req *cqr;
2841         struct ccw1 *ccw;
2842         int rc;
2843
2844         /* Copy parms from caller */
2845         rc = -EFAULT;
2846         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
2847                 goto out;
2848         if (is_compat_task() || sizeof(long) == 4) {
2849                 /* Make sure pointers are sane even on 31 bit. */
2850                 rc = -EINVAL;
2851                 if ((usrparm.psf_data >> 32) != 0)
2852                         goto out;
2853                 if ((usrparm.rssd_result >> 32) != 0)
2854                         goto out;
2855                 usrparm.psf_data &= 0x7fffffffULL;
2856                 usrparm.rssd_result &= 0x7fffffffULL;
2857         }
2858         /* alloc I/O data area */
2859         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
2860         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
2861         if (!psf_data || !rssd_result) {
2862                 rc = -ENOMEM;
2863                 goto out_free;
2864         }
2865
2866         /* get syscall header from user space */
2867         rc = -EFAULT;
2868         if (copy_from_user(psf_data,
2869                            (void __user *)(unsigned long) usrparm.psf_data,
2870                            usrparm.psf_data_len))
2871                 goto out_free;
2872
2873         /* sanity check on syscall header */
2874         if (psf_data[0] != 0x17 && psf_data[1] != 0xce) {
2875                 rc = -EINVAL;
2876                 goto out_free;
2877         }
2878
2879         /* setup CCWs for PSF + RSSD */
2880         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
2881         if (IS_ERR(cqr)) {
2882                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2883                         "Could not allocate initialization request");
2884                 rc = PTR_ERR(cqr);
2885                 goto out_free;
2886         }
2887
2888         cqr->startdev = device;
2889         cqr->memdev = device;
2890         cqr->retries = 3;
2891         cqr->expires = 10 * HZ;
2892         cqr->buildclk = get_clock();
2893         cqr->status = DASD_CQR_FILLED;
2894
2895         /* Build the ccws */
2896         ccw = cqr->cpaddr;
2897
2898         /* PSF ccw */
2899         ccw->cmd_code = DASD_ECKD_CCW_PSF;
2900         ccw->count = usrparm.psf_data_len;
2901         ccw->flags |= CCW_FLAG_CC;
2902         ccw->cda = (__u32)(addr_t) psf_data;
2903
2904         ccw++;
2905
2906         /* RSSD ccw  */
2907         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
2908         ccw->count = usrparm.rssd_result_len;
2909         ccw->flags = CCW_FLAG_SLI ;
2910         ccw->cda = (__u32)(addr_t) rssd_result;
2911
2912         rc = dasd_sleep_on(cqr);
2913         if (rc)
2914                 goto out_sfree;
2915
2916         rc = -EFAULT;
2917         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
2918                            rssd_result, usrparm.rssd_result_len))
2919                 goto out_sfree;
2920         rc = 0;
2921
2922 out_sfree:
2923         dasd_sfree_request(cqr, cqr->memdev);
2924 out_free:
2925         kfree(rssd_result);
2926         kfree(psf_data);
2927 out:
2928         DBF_DEV_EVENT(DBF_WARNING, device, "Symmetrix ioctl: rc=%d", rc);
2929         return rc;
2930 }
2931
2932 static int
2933 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
2934 {
2935         struct dasd_device *device = block->base;
2936
2937         switch (cmd) {
2938         case BIODASDGATTR:
2939                 return dasd_eckd_get_attrib(device, argp);
2940         case BIODASDSATTR:
2941                 return dasd_eckd_set_attrib(device, argp);
2942         case BIODASDPSRD:
2943                 return dasd_eckd_performance(device, argp);
2944         case BIODASDRLSE:
2945                 return dasd_eckd_release(device);
2946         case BIODASDRSRV:
2947                 return dasd_eckd_reserve(device);
2948         case BIODASDSLCK:
2949                 return dasd_eckd_steal_lock(device);
2950         case BIODASDSYMMIO:
2951                 return dasd_symm_io(device, argp);
2952         default:
2953                 return -ENOIOCTLCMD;
2954         }
2955 }
2956
2957 /*
2958  * Dump the range of CCWs into 'page' buffer
2959  * and return number of printed chars.
2960  */
2961 static int
2962 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
2963 {
2964         int len, count;
2965         char *datap;
2966
2967         len = 0;
2968         while (from <= to) {
2969                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2970                                " CCW %p: %08X %08X DAT:",
2971                                from, ((int *) from)[0], ((int *) from)[1]);
2972
2973                 /* get pointer to data (consider IDALs) */
2974                 if (from->flags & CCW_FLAG_IDA)
2975                         datap = (char *) *((addr_t *) (addr_t) from->cda);
2976                 else
2977                         datap = (char *) ((addr_t) from->cda);
2978
2979                 /* dump data (max 32 bytes) */
2980                 for (count = 0; count < from->count && count < 32; count++) {
2981                         if (count % 8 == 0) len += sprintf(page + len, " ");
2982                         if (count % 4 == 0) len += sprintf(page + len, " ");
2983                         len += sprintf(page + len, "%02x", datap[count]);
2984                 }
2985                 len += sprintf(page + len, "\n");
2986                 from++;
2987         }
2988         return len;
2989 }
2990
2991 static void
2992 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
2993                          char *reason)
2994 {
2995         u64 *sense;
2996
2997         sense = (u64 *) dasd_get_sense(irb);
2998         if (sense) {
2999                 DBF_DEV_EVENT(DBF_EMERG, device,
3000                               "%s: %s %02x%02x%02x %016llx %016llx %016llx "
3001                               "%016llx", reason,
3002                               scsw_is_tm(&irb->scsw) ? "t" : "c",
3003                               scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw),
3004                               scsw_dstat(&irb->scsw), sense[0], sense[1],
3005                               sense[2], sense[3]);
3006         } else {
3007                 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
3008                               "SORRY - NO VALID SENSE AVAILABLE\n");
3009         }
3010 }
3011
3012 /*
3013  * Print sense data and related channel program.
3014  * Parts are printed because printk buffer is only 1024 bytes.
3015  */
3016 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
3017                                  struct dasd_ccw_req *req, struct irb *irb)
3018 {
3019         char *page;
3020         struct ccw1 *first, *last, *fail, *from, *to;
3021         int len, sl, sct;
3022
3023         page = (char *) get_zeroed_page(GFP_ATOMIC);
3024         if (page == NULL) {
3025                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3026                               "No memory to dump sense data\n");
3027                 return;
3028         }
3029         /* dump the sense data */
3030         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3031                       " I/O status report for device %s:\n",
3032                       dev_name(&device->cdev->dev));
3033         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3034                        " in req: %p CS: 0x%02X DS: 0x%02X CC: 0x%02X RC: %d\n",
3035                        req, scsw_cstat(&irb->scsw), scsw_dstat(&irb->scsw),
3036                        scsw_cc(&irb->scsw), req ? req->intrc : 0);
3037         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3038                        " device %s: Failing CCW: %p\n",
3039                        dev_name(&device->cdev->dev),
3040                        (void *) (addr_t) irb->scsw.cmd.cpa);
3041         if (irb->esw.esw0.erw.cons) {
3042                 for (sl = 0; sl < 4; sl++) {
3043                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3044                                        " Sense(hex) %2d-%2d:",
3045                                        (8 * sl), ((8 * sl) + 7));
3046
3047                         for (sct = 0; sct < 8; sct++) {
3048                                 len += sprintf(page + len, " %02x",
3049                                                irb->ecw[8 * sl + sct]);
3050                         }
3051                         len += sprintf(page + len, "\n");
3052                 }
3053
3054                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
3055                         /* 24 Byte Sense Data */
3056                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3057                                 " 24 Byte: %x MSG %x, "
3058                                 "%s MSGb to SYSOP\n",
3059                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
3060                                 irb->ecw[1] & 0x10 ? "" : "no");
3061                 } else {
3062                         /* 32 Byte Sense Data */
3063                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3064                                 " 32 Byte: Format: %x "
3065                                 "Exception class %x\n",
3066                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
3067                 }
3068         } else {
3069                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3070                         " SORRY - NO VALID SENSE AVAILABLE\n");
3071         }
3072         printk("%s", page);
3073
3074         if (req) {
3075                 /* req == NULL for unsolicited interrupts */
3076                 /* dump the Channel Program (max 140 Bytes per line) */
3077                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
3078                 first = req->cpaddr;
3079                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
3080                 to = min(first + 6, last);
3081                 len = sprintf(page,  KERN_ERR PRINTK_HEADER
3082                               " Related CP in req: %p\n", req);
3083                 dasd_eckd_dump_ccw_range(first, to, page + len);
3084                 printk("%s", page);
3085
3086                 /* print failing CCW area (maximum 4) */
3087                 /* scsw->cda is either valid or zero  */
3088                 len = 0;
3089                 from = ++to;
3090                 fail = (struct ccw1 *)(addr_t)
3091                                 irb->scsw.cmd.cpa; /* failing CCW */
3092                 if (from <  fail - 2) {
3093                         from = fail - 2;     /* there is a gap - print header */
3094                         len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
3095                 }
3096                 to = min(fail + 1, last);
3097                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
3098
3099                 /* print last CCWs (maximum 2) */
3100                 from = max(from, ++to);
3101                 if (from < last - 1) {
3102                         from = last - 1;     /* there is a gap - print header */
3103                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
3104                 }
3105                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
3106                 if (len > 0)
3107                         printk("%s", page);
3108         }
3109         free_page((unsigned long) page);
3110 }
3111
3112
3113 /*
3114  * Print sense data from a tcw.
3115  */
3116 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
3117                                  struct dasd_ccw_req *req, struct irb *irb)
3118 {
3119         char *page;
3120         int len, sl, sct, residual;
3121
3122         struct tsb *tsb;
3123         u8 *sense;
3124
3125
3126         page = (char *) get_zeroed_page(GFP_ATOMIC);
3127         if (page == NULL) {
3128                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
3129                             "No memory to dump sense data");
3130                 return;
3131         }
3132         /* dump the sense data */
3133         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3134                       " I/O status report for device %s:\n",
3135                       dev_name(&device->cdev->dev));
3136         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3137                        " in req: %p CS: 0x%02X DS: 0x%02X CC: 0x%02X RC: %d "
3138                        "fcxs: 0x%02X schxs: 0x%02X\n", req,
3139                        scsw_cstat(&irb->scsw), scsw_dstat(&irb->scsw),
3140                        scsw_cc(&irb->scsw), req->intrc,
3141                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs);
3142         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3143                        " device %s: Failing TCW: %p\n",
3144                        dev_name(&device->cdev->dev),
3145                        (void *) (addr_t) irb->scsw.tm.tcw);
3146
3147         tsb = NULL;
3148         sense = NULL;
3149         if (irb->scsw.tm.tcw)
3150                 tsb = tcw_get_tsb(
3151                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
3152
3153         if (tsb && (irb->scsw.tm.fcxs == 0x01)) {
3154                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3155                                " tsb->length %d\n", tsb->length);
3156                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3157                                " tsb->flags %x\n", tsb->flags);
3158                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3159                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
3160                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3161                                " tsb->count %d\n", tsb->count);
3162                 residual = tsb->count - 28;
3163                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3164                                " residual %d\n", residual);
3165
3166                 switch (tsb->flags & 0x07) {
3167                 case 1: /* tsa_iostat */
3168                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3169                                " tsb->tsa.iostat.dev_time %d\n",
3170                                        tsb->tsa.iostat.dev_time);
3171                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3172                                " tsb->tsa.iostat.def_time %d\n",
3173                                        tsb->tsa.iostat.def_time);
3174                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3175                                " tsb->tsa.iostat.queue_time %d\n",
3176                                        tsb->tsa.iostat.queue_time);
3177                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3178                                " tsb->tsa.iostat.dev_busy_time %d\n",
3179                                        tsb->tsa.iostat.dev_busy_time);
3180                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3181                                " tsb->tsa.iostat.dev_act_time %d\n",
3182                                        tsb->tsa.iostat.dev_act_time);
3183                         sense = tsb->tsa.iostat.sense;
3184                         break;
3185                 case 2: /* ts_ddpc */
3186                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3187                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
3188                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3189                                " tsb->tsa.ddpc.rcq:  ");
3190                         for (sl = 0; sl < 16; sl++) {
3191                                 for (sct = 0; sct < 8; sct++) {
3192                                         len += sprintf(page + len, " %02x",
3193                                                        tsb->tsa.ddpc.rcq[sl]);
3194                                 }
3195                                 len += sprintf(page + len, "\n");
3196                         }
3197                         sense = tsb->tsa.ddpc.sense;
3198                         break;
3199                 case 3: /* tsa_intrg */
3200                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3201                                       " tsb->tsa.intrg.: not supportet yet \n");
3202                         break;
3203                 }
3204
3205                 if (sense) {
3206                         for (sl = 0; sl < 4; sl++) {
3207                                 len += sprintf(page + len,
3208                                                KERN_ERR PRINTK_HEADER
3209                                                " Sense(hex) %2d-%2d:",
3210                                                (8 * sl), ((8 * sl) + 7));
3211                                 for (sct = 0; sct < 8; sct++) {
3212                                         len += sprintf(page + len, " %02x",
3213                                                        sense[8 * sl + sct]);
3214                                 }
3215                                 len += sprintf(page + len, "\n");
3216                         }
3217
3218                         if (sense[27] & DASD_SENSE_BIT_0) {
3219                                 /* 24 Byte Sense Data */
3220                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3221                                         " 24 Byte: %x MSG %x, "
3222                                         "%s MSGb to SYSOP\n",
3223                                         sense[7] >> 4, sense[7] & 0x0f,
3224                                         sense[1] & 0x10 ? "" : "no");
3225                         } else {
3226                                 /* 32 Byte Sense Data */
3227                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3228                                         " 32 Byte: Format: %x "
3229                                         "Exception class %x\n",
3230                                         sense[6] & 0x0f, sense[22] >> 4);
3231                         }
3232                 } else {
3233                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3234                                 " SORRY - NO VALID SENSE AVAILABLE\n");
3235                 }
3236         } else {
3237                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3238                         " SORRY - NO TSB DATA AVAILABLE\n");
3239         }
3240         printk("%s", page);
3241         free_page((unsigned long) page);
3242 }
3243
3244 static void dasd_eckd_dump_sense(struct dasd_device *device,
3245                                  struct dasd_ccw_req *req, struct irb *irb)
3246 {
3247         if (req && scsw_is_tm(&req->irb.scsw))
3248                 dasd_eckd_dump_sense_tcw(device, req, irb);
3249         else
3250                 dasd_eckd_dump_sense_ccw(device, req, irb);
3251 }
3252
3253 int dasd_eckd_pm_freeze(struct dasd_device *device)
3254 {
3255         /*
3256          * the device should be disconnected from our LCU structure
3257          * on restore we will reconnect it and reread LCU specific
3258          * information like PAV support that might have changed
3259          */
3260         dasd_alias_remove_device(device);
3261         dasd_alias_disconnect_device_from_lcu(device);
3262
3263         return 0;
3264 }
3265
3266 int dasd_eckd_restore_device(struct dasd_device *device)
3267 {
3268         struct dasd_eckd_private *private;
3269         struct dasd_eckd_characteristics temp_rdc_data;
3270         int is_known, rc;
3271         struct dasd_uid temp_uid;
3272         unsigned long flags;
3273
3274         private = (struct dasd_eckd_private *) device->private;
3275
3276         /* Read Configuration Data */
3277         rc = dasd_eckd_read_conf(device);
3278         if (rc)
3279                 goto out_err;
3280
3281         /* Generate device unique id and register in devmap */
3282         rc = dasd_eckd_generate_uid(device, &private->uid);
3283         dasd_get_uid(device->cdev, &temp_uid);
3284         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
3285                 dev_err(&device->cdev->dev, "The UID of the DASD has "
3286                         "changed\n");
3287         if (rc)
3288                 goto out_err;
3289         dasd_set_uid(device->cdev, &private->uid);
3290
3291         /* register lcu with alias handling, enable PAV if this is a new lcu */
3292         is_known = dasd_alias_make_device_known_to_lcu(device);
3293         if (is_known < 0)
3294                 return is_known;
3295         if (!is_known) {
3296                 dasd_eckd_validate_server(device);
3297                 dasd_alias_lcu_setup_complete(device);
3298         } else
3299                 dasd_alias_wait_for_lcu_setup(device);
3300
3301         /* RE-Read Configuration Data */
3302         rc = dasd_eckd_read_conf(device);
3303         if (rc)
3304                 goto out_err;
3305
3306         /* Read Feature Codes */
3307         dasd_eckd_read_features(device);
3308
3309         /* Read Device Characteristics */
3310         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
3311                                          &temp_rdc_data, 64);
3312         if (rc) {
3313                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
3314                                 "Read device characteristic failed, rc=%d", rc);
3315                 goto out_err;
3316         }
3317         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
3318         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
3319         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
3320
3321         /* add device to alias management */
3322         dasd_alias_add_device(device);
3323
3324         return 0;
3325
3326 out_err:
3327         return -1;
3328 }
3329
3330 static struct ccw_driver dasd_eckd_driver = {
3331         .name        = "dasd-eckd",
3332         .owner       = THIS_MODULE,
3333         .ids         = dasd_eckd_ids,
3334         .probe       = dasd_eckd_probe,
3335         .remove      = dasd_generic_remove,
3336         .set_offline = dasd_generic_set_offline,
3337         .set_online  = dasd_eckd_set_online,
3338         .notify      = dasd_generic_notify,
3339         .freeze      = dasd_generic_pm_freeze,
3340         .thaw        = dasd_generic_restore_device,
3341         .restore     = dasd_generic_restore_device,
3342 };
3343
3344 /*
3345  * max_blocks is dependent on the amount of storage that is available
3346  * in the static io buffer for each device. Currently each device has
3347  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
3348  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
3349  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
3350  * addition we have one define extent ccw + 16 bytes of data and one
3351  * locate record ccw + 16 bytes of data. That makes:
3352  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
3353  * We want to fit two into the available memory so that we can immediately
3354  * start the next request if one finishes off. That makes 249.5 blocks
3355  * for one request. Give a little safety and the result is 240.
3356  */
3357 static struct dasd_discipline dasd_eckd_discipline = {
3358         .owner = THIS_MODULE,
3359         .name = "ECKD",
3360         .ebcname = "ECKD",
3361         .max_blocks = 240,
3362         .check_device = dasd_eckd_check_characteristics,
3363         .uncheck_device = dasd_eckd_uncheck_device,
3364         .do_analysis = dasd_eckd_do_analysis,
3365         .ready_to_online = dasd_eckd_ready_to_online,
3366         .online_to_ready = dasd_eckd_online_to_ready,
3367         .fill_geometry = dasd_eckd_fill_geometry,
3368         .start_IO = dasd_start_IO,
3369         .term_IO = dasd_term_IO,
3370         .handle_terminated_request = dasd_eckd_handle_terminated_request,
3371         .format_device = dasd_eckd_format_device,
3372         .erp_action = dasd_eckd_erp_action,
3373         .erp_postaction = dasd_eckd_erp_postaction,
3374         .handle_unsolicited_interrupt = dasd_eckd_handle_unsolicited_interrupt,
3375         .build_cp = dasd_eckd_build_alias_cp,
3376         .free_cp = dasd_eckd_free_alias_cp,
3377         .dump_sense = dasd_eckd_dump_sense,
3378         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
3379         .fill_info = dasd_eckd_fill_info,
3380         .ioctl = dasd_eckd_ioctl,
3381         .freeze = dasd_eckd_pm_freeze,
3382         .restore = dasd_eckd_restore_device,
3383 };
3384
3385 static int __init
3386 dasd_eckd_init(void)
3387 {
3388         int ret;
3389
3390         ASCEBC(dasd_eckd_discipline.ebcname, 4);
3391         ret = ccw_driver_register(&dasd_eckd_driver);
3392         if (!ret)
3393                 wait_for_device_probe();
3394
3395         return ret;
3396 }
3397
3398 static void __exit
3399 dasd_eckd_cleanup(void)
3400 {
3401         ccw_driver_unregister(&dasd_eckd_driver);
3402 }
3403
3404 module_init(dasd_eckd_init);
3405 module_exit(dasd_eckd_cleanup);