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"
  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/io.h>
  27 #include <asm/todclk.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 /* initial attempt at a probe function. this can be simplified once
  82  * the other detection code is gone */
  83 static int
  84 dasd_eckd_probe (struct ccw_device *cdev)
  85 {
  86         int ret;
  87
  88         /* set ECKD specific ccw-device options */
  89         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE);
  90         if (ret) {
  91                 DBF_EVENT(DBF_WARNING,
  92                        "dasd_eckd_probe: could not set ccw-device options "
  93                        "for %s\n", dev_name(&cdev->dev));
  94                 return ret;
  95         }
  96         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
  97         return ret;
  98 }
  99
 100 static int
 101 dasd_eckd_set_online(struct ccw_device *cdev)
 102 {
 103         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
 104 }
 105
 106 static const int sizes_trk0[] = { 28, 148, 84 };
 107 #define LABEL_SIZE 140
 108
 109 static inline unsigned int
 110 round_up_multiple(unsigned int no, unsigned int mult)
 111 {
 112         int rem = no % mult;
 113         return (rem ? no - rem + mult : no);
 114 }
 115
 116 static inline unsigned int
 117 ceil_quot(unsigned int d1, unsigned int d2)
 118 {
 119         return (d1 + (d2 - 1)) / d2;
 120 }
 121
 122 static unsigned int
 123 recs_per_track(struct dasd_eckd_characteristics * rdc,
 124                unsigned int kl, unsigned int dl)
 125 {
 126         int dn, kn;
 127
 128         switch (rdc->dev_type) {
 129         case 0x3380:
 130                 if (kl)
 131                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 132                                        ceil_quot(dl + 12, 32));
 133                 else
 134                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 135         case 0x3390:
 136                 dn = ceil_quot(dl + 6, 232) + 1;
 137                 if (kl) {
 138                         kn = ceil_quot(kl + 6, 232) + 1;
 139                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 140                                        9 + ceil_quot(dl + 6 * dn, 34));
 141                 } else
 142                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 143         case 0x9345:
 144                 dn = ceil_quot(dl + 6, 232) + 1;
 145                 if (kl) {
 146                         kn = ceil_quot(kl + 6, 232) + 1;
 147                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 148                                        ceil_quot(dl + 6 * dn, 34));
 149                 } else
 150                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 151         }
 152         return 0;
 153 }
 154
 155 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
 156 {
 157         geo->cyl = (__u16) cyl;
 158         geo->head = cyl >> 16;
 159         geo->head <<= 4;
 160         geo->head |= head;
 161 }
 162
 163 static int
 164 check_XRC (struct ccw1         *de_ccw,
 165            struct DE_eckd_data *data,
 166            struct dasd_device  *device)
 167 {
 168         struct dasd_eckd_private *private;
 169         int rc;
 170
 171         private = (struct dasd_eckd_private *) device->private;
 172         if (!private->rdc_data.facilities.XRC_supported)
 173                 return 0;
 174
 175         /* switch on System Time Stamp - needed for XRC Support */
 176         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 177         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 178
 179         rc = get_sync_clock(&data->ep_sys_time);
 180         /* Ignore return code if sync clock is switched off. */
 181         if (rc == -ENOSYS || rc == -EACCES)
 182                 rc = 0;
 183
 184         de_ccw->count = sizeof(struct DE_eckd_data);
 185         de_ccw->flags |= CCW_FLAG_SLI;
 186         return rc;
 187 }
 188
 189 static int
 190 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
 191               unsigned int totrk, int cmd, struct dasd_device *device)
 192 {
 193         struct dasd_eckd_private *private;
 194         u32 begcyl, endcyl;
 195         u16 heads, beghead, endhead;
 196         int rc = 0;
 197
 198         private = (struct dasd_eckd_private *) device->private;
 199
 200         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 201         ccw->flags = 0;
 202         ccw->count = 16;
 203         ccw->cda = (__u32) __pa(data);
 204
 205         memset(data, 0, sizeof(struct DE_eckd_data));
 206         switch (cmd) {
 207         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 208         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 209         case DASD_ECKD_CCW_READ:
 210         case DASD_ECKD_CCW_READ_MT:
 211         case DASD_ECKD_CCW_READ_CKD:
 212         case DASD_ECKD_CCW_READ_CKD_MT:
 213         case DASD_ECKD_CCW_READ_KD:
 214         case DASD_ECKD_CCW_READ_KD_MT:
 215         case DASD_ECKD_CCW_READ_COUNT:
 216                 data->mask.perm = 0x1;
 217                 data->attributes.operation = private->attrib.operation;
 218                 break;
 219         case DASD_ECKD_CCW_WRITE:
 220         case DASD_ECKD_CCW_WRITE_MT:
 221         case DASD_ECKD_CCW_WRITE_KD:
 222         case DASD_ECKD_CCW_WRITE_KD_MT:
 223                 data->mask.perm = 0x02;
 224                 data->attributes.operation = private->attrib.operation;
 225                 rc = check_XRC (ccw, data, device);
 226                 break;
 227         case DASD_ECKD_CCW_WRITE_CKD:
 228         case DASD_ECKD_CCW_WRITE_CKD_MT:
 229                 data->attributes.operation = DASD_BYPASS_CACHE;
 230                 rc = check_XRC (ccw, data, device);
 231                 break;
 232         case DASD_ECKD_CCW_ERASE:
 233         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 234         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 235                 data->mask.perm = 0x3;
 236                 data->mask.auth = 0x1;
 237                 data->attributes.operation = DASD_BYPASS_CACHE;
 238                 rc = check_XRC (ccw, data, device);
 239                 break;
 240         default:
 241                 dev_err(&device->cdev->dev,
 242                         "0x%x is not a known command\n", cmd);
 243                 break;
 244         }
 245
 246         data->attributes.mode = 0x3;    /* ECKD */
 247
 248         if ((private->rdc_data.cu_type == 0x2105 ||
 249              private->rdc_data.cu_type == 0x2107 ||
 250              private->rdc_data.cu_type == 0x1750)
 251             && !(private->uses_cdl && trk < 2))
 252                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 253
 254         heads = private->rdc_data.trk_per_cyl;
 255         begcyl = trk / heads;
 256         beghead = trk % heads;
 257         endcyl = totrk / heads;
 258         endhead = totrk % heads;
 259
 260         /* check for sequential prestage - enhance cylinder range */
 261         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 262             data->attributes.operation == DASD_SEQ_ACCESS) {
 263
 264                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
 265                         endcyl += private->attrib.nr_cyl;
 266                 else
 267                         endcyl = (private->real_cyl - 1);
 268         }
 269
 270         set_ch_t(&data->beg_ext, begcyl, beghead);
 271         set_ch_t(&data->end_ext, endcyl, endhead);
 272         return rc;
 273 }
 274
 275 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
 276                                struct dasd_device  *device)
 277 {
 278         struct dasd_eckd_private *private;
 279         int rc;
 280
 281         private = (struct dasd_eckd_private *) device->private;
 282         if (!private->rdc_data.facilities.XRC_supported)
 283                 return 0;
 284
 285         /* switch on System Time Stamp - needed for XRC Support */
 286         pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid'   */
 287         pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
 288         pfxdata->validity.time_stamp = 1;           /* 'Time Stamp Valid'   */
 289
 290         rc = get_sync_clock(&pfxdata->define_extent.ep_sys_time);
 291         /* Ignore return code if sync clock is switched off. */
 292         if (rc == -ENOSYS || rc == -EACCES)
 293                 rc = 0;
 294         return rc;
 295 }
 296
 297 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
 298                           unsigned int rec_on_trk, int count, int cmd,
 299                           struct dasd_device *device, unsigned int reclen,
 300                           unsigned int tlf)
 301 {
 302         struct dasd_eckd_private *private;
 303         int sector;
 304         int dn, d;
 305
 306         private = (struct dasd_eckd_private *) device->private;
 307
 308         memset(data, 0, sizeof(*data));
 309         sector = 0;
 310         if (rec_on_trk) {
 311                 switch (private->rdc_data.dev_type) {
 312                 case 0x3390:
 313                         dn = ceil_quot(reclen + 6, 232);
 314                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 315                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 316                         break;
 317                 case 0x3380:
 318                         d = 7 + ceil_quot(reclen + 12, 32);
 319                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 320                         break;
 321                 }
 322         }
 323         data->sector = sector;
 324         /* note: meaning of count depends on the operation
 325          *       for record based I/O it's the number of records, but for
 326          *       track based I/O it's the number of tracks
 327          */
 328         data->count = count;
 329         switch (cmd) {
 330         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 331                 data->operation.orientation = 0x3;
 332                 data->operation.operation = 0x03;
 333                 break;
 334         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 335                 data->operation.orientation = 0x3;
 336                 data->operation.operation = 0x16;
 337                 break;
 338         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 339                 data->operation.orientation = 0x1;
 340                 data->operation.operation = 0x03;
 341                 data->count++;
 342                 break;
 343         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 344                 data->operation.orientation = 0x3;
 345                 data->operation.operation = 0x16;
 346                 data->count++;
 347                 break;
 348         case DASD_ECKD_CCW_WRITE:
 349         case DASD_ECKD_CCW_WRITE_MT:
 350         case DASD_ECKD_CCW_WRITE_KD:
 351         case DASD_ECKD_CCW_WRITE_KD_MT:
 352                 data->auxiliary.length_valid = 0x1;
 353                 data->length = reclen;
 354                 data->operation.operation = 0x01;
 355                 break;
 356         case DASD_ECKD_CCW_WRITE_CKD:
 357         case DASD_ECKD_CCW_WRITE_CKD_MT:
 358                 data->auxiliary.length_valid = 0x1;
 359                 data->length = reclen;
 360                 data->operation.operation = 0x03;
 361                 break;
 362         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 363                 data->auxiliary.length_valid = 0x1;
 364                 data->length = reclen;  /* not tlf, as one might think */
 365                 data->operation.operation = 0x3F;
 366                 data->extended_operation = 0x23;
 367                 break;
 368         case DASD_ECKD_CCW_READ:
 369         case DASD_ECKD_CCW_READ_MT:
 370         case DASD_ECKD_CCW_READ_KD:
 371         case DASD_ECKD_CCW_READ_KD_MT:
 372                 data->auxiliary.length_valid = 0x1;
 373                 data->length = reclen;
 374                 data->operation.operation = 0x06;
 375                 break;
 376         case DASD_ECKD_CCW_READ_CKD:
 377         case DASD_ECKD_CCW_READ_CKD_MT:
 378                 data->auxiliary.length_valid = 0x1;
 379                 data->length = reclen;
 380                 data->operation.operation = 0x16;
 381                 break;
 382         case DASD_ECKD_CCW_READ_COUNT:
 383                 data->operation.operation = 0x06;
 384                 break;
 385         case DASD_ECKD_CCW_READ_TRACK_DATA:
 386                 data->auxiliary.length_valid = 0x1;
 387                 data->length = tlf;
 388                 data->operation.operation = 0x0C;
 389                 break;
 390         case DASD_ECKD_CCW_ERASE:
 391                 data->length = reclen;
 392                 data->auxiliary.length_valid = 0x1;
 393                 data->operation.operation = 0x0b;
 394                 break;
 395         default:
 396                 DBF_DEV_EVENT(DBF_ERR, device,
 397                             "fill LRE unknown opcode 0x%x", cmd);
 398                 BUG();
 399         }
 400         set_ch_t(&data->seek_addr,
 401                  trk / private->rdc_data.trk_per_cyl,
 402                  trk % private->rdc_data.trk_per_cyl);
 403         data->search_arg.cyl = data->seek_addr.cyl;
 404         data->search_arg.head = data->seek_addr.head;
 405         data->search_arg.record = rec_on_trk;
 406 }
 407
 408 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 409                       unsigned int trk, unsigned int totrk, int cmd,
 410                       struct dasd_device *basedev, struct dasd_device *startdev,
 411                       unsigned char format, unsigned int rec_on_trk, int count,
 412                       unsigned int blksize, unsigned int tlf)
 413 {
 414         struct dasd_eckd_private *basepriv, *startpriv;
 415         struct DE_eckd_data *dedata;
 416         struct LRE_eckd_data *lredata;
 417         u32 begcyl, endcyl;
 418         u16 heads, beghead, endhead;
 419         int rc = 0;
 420
 421         basepriv = (struct dasd_eckd_private *) basedev->private;
 422         startpriv = (struct dasd_eckd_private *) startdev->private;
 423         dedata = &pfxdata->define_extent;
 424         lredata = &pfxdata->locate_record;
 425
 426         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 427         ccw->flags = 0;
 428         ccw->count = sizeof(*pfxdata);
 429         ccw->cda = (__u32) __pa(pfxdata);
 430
 431         memset(pfxdata, 0, sizeof(*pfxdata));
 432         /* prefix data */
 433         if (format > 1) {
 434                 DBF_DEV_EVENT(DBF_ERR, basedev,
 435                               "PFX LRE unknown format 0x%x", format);
 436                 BUG();
 437                 return -EINVAL;
 438         }
 439         pfxdata->format = format;
 440         pfxdata->base_address = basepriv->ned->unit_addr;
 441         pfxdata->base_lss = basepriv->ned->ID;
 442         pfxdata->validity.define_extent = 1;
 443
 444         /* private uid is kept up to date, conf_data may be outdated */
 445         if (startpriv->uid.type != UA_BASE_DEVICE) {
 446                 pfxdata->validity.verify_base = 1;
 447                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
 448                         pfxdata->validity.hyper_pav = 1;
 449         }
 450
 451         /* define extend data (mostly)*/
 452         switch (cmd) {
 453         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 454         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 455         case DASD_ECKD_CCW_READ:
 456         case DASD_ECKD_CCW_READ_MT:
 457         case DASD_ECKD_CCW_READ_CKD:
 458         case DASD_ECKD_CCW_READ_CKD_MT:
 459         case DASD_ECKD_CCW_READ_KD:
 460         case DASD_ECKD_CCW_READ_KD_MT:
 461         case DASD_ECKD_CCW_READ_COUNT:
 462                 dedata->mask.perm = 0x1;
 463                 dedata->attributes.operation = basepriv->attrib.operation;
 464                 break;
 465         case DASD_ECKD_CCW_READ_TRACK_DATA:
 466                 dedata->mask.perm = 0x1;
 467                 dedata->attributes.operation = basepriv->attrib.operation;
 468                 dedata->blk_size = 0;
 469                 break;
 470         case DASD_ECKD_CCW_WRITE:
 471         case DASD_ECKD_CCW_WRITE_MT:
 472         case DASD_ECKD_CCW_WRITE_KD:
 473         case DASD_ECKD_CCW_WRITE_KD_MT:
 474                 dedata->mask.perm = 0x02;
 475                 dedata->attributes.operation = basepriv->attrib.operation;
 476                 rc = check_XRC_on_prefix(pfxdata, basedev);
 477                 break;
 478         case DASD_ECKD_CCW_WRITE_CKD:
 479         case DASD_ECKD_CCW_WRITE_CKD_MT:
 480                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 481                 rc = check_XRC_on_prefix(pfxdata, basedev);
 482                 break;
 483         case DASD_ECKD_CCW_ERASE:
 484         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 485         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 486                 dedata->mask.perm = 0x3;
 487                 dedata->mask.auth = 0x1;
 488                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 489                 rc = check_XRC_on_prefix(pfxdata, basedev);
 490                 break;
 491         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 492                 dedata->mask.perm = 0x02;
 493                 dedata->attributes.operation = basepriv->attrib.operation;
 494                 dedata->blk_size = blksize;
 495                 rc = check_XRC_on_prefix(pfxdata, basedev);
 496                 break;
 497         default:
 498                 DBF_DEV_EVENT(DBF_ERR, basedev,
 499                             "PFX LRE unknown opcode 0x%x", cmd);
 500                 BUG();
 501                 return -EINVAL;
 502         }
 503
 504         dedata->attributes.mode = 0x3;  /* ECKD */
 505
 506         if ((basepriv->rdc_data.cu_type == 0x2105 ||
 507              basepriv->rdc_data.cu_type == 0x2107 ||
 508              basepriv->rdc_data.cu_type == 0x1750)
 509             && !(basepriv->uses_cdl && trk < 2))
 510                 dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
 511
 512         heads = basepriv->rdc_data.trk_per_cyl;
 513         begcyl = trk / heads;
 514         beghead = trk % heads;
 515         endcyl = totrk / heads;
 516         endhead = totrk % heads;
 517
 518         /* check for sequential prestage - enhance cylinder range */
 519         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
 520             dedata->attributes.operation == DASD_SEQ_ACCESS) {
 521
 522                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
 523                         endcyl += basepriv->attrib.nr_cyl;
 524                 else
 525                         endcyl = (basepriv->real_cyl - 1);
 526         }
 527
 528         set_ch_t(&dedata->beg_ext, begcyl, beghead);
 529         set_ch_t(&dedata->end_ext, endcyl, endhead);
 530
 531         if (format == 1) {
 532                 fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
 533                               basedev, blksize, tlf);
 534         }
 535
 536         return rc;
 537 }
 538
 539 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 540                   unsigned int trk, unsigned int totrk, int cmd,
 541                   struct dasd_device *basedev, struct dasd_device *startdev)
 542 {
 543         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
 544                           0, 0, 0, 0, 0);
 545 }
 546
 547 static void
 548 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
 549               unsigned int rec_on_trk, int no_rec, int cmd,
 550               struct dasd_device * device, int reclen)
 551 {
 552         struct dasd_eckd_private *private;
 553         int sector;
 554         int dn, d;
 555
 556         private = (struct dasd_eckd_private *) device->private;
 557
 558         DBF_DEV_EVENT(DBF_INFO, device,
 559                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 560                   trk, rec_on_trk, no_rec, cmd, reclen);
 561
 562         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 563         ccw->flags = 0;
 564         ccw->count = 16;
 565         ccw->cda = (__u32) __pa(data);
 566
 567         memset(data, 0, sizeof(struct LO_eckd_data));
 568         sector = 0;
 569         if (rec_on_trk) {
 570                 switch (private->rdc_data.dev_type) {
 571                 case 0x3390:
 572                         dn = ceil_quot(reclen + 6, 232);
 573                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 574                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 575                         break;
 576                 case 0x3380:
 577                         d = 7 + ceil_quot(reclen + 12, 32);
 578                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 579                         break;
 580                 }
 581         }
 582         data->sector = sector;
 583         data->count = no_rec;
 584         switch (cmd) {
 585         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 586                 data->operation.orientation = 0x3;
 587                 data->operation.operation = 0x03;
 588                 break;
 589         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 590                 data->operation.orientation = 0x3;
 591                 data->operation.operation = 0x16;
 592                 break;
 593         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 594                 data->operation.orientation = 0x1;
 595                 data->operation.operation = 0x03;
 596                 data->count++;
 597                 break;
 598         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 599                 data->operation.orientation = 0x3;
 600                 data->operation.operation = 0x16;
 601                 data->count++;
 602                 break;
 603         case DASD_ECKD_CCW_WRITE:
 604         case DASD_ECKD_CCW_WRITE_MT:
 605         case DASD_ECKD_CCW_WRITE_KD:
 606         case DASD_ECKD_CCW_WRITE_KD_MT:
 607                 data->auxiliary.last_bytes_used = 0x1;
 608                 data->length = reclen;
 609                 data->operation.operation = 0x01;
 610                 break;
 611         case DASD_ECKD_CCW_WRITE_CKD:
 612         case DASD_ECKD_CCW_WRITE_CKD_MT:
 613                 data->auxiliary.last_bytes_used = 0x1;
 614                 data->length = reclen;
 615                 data->operation.operation = 0x03;
 616                 break;
 617         case DASD_ECKD_CCW_READ:
 618         case DASD_ECKD_CCW_READ_MT:
 619         case DASD_ECKD_CCW_READ_KD:
 620         case DASD_ECKD_CCW_READ_KD_MT:
 621                 data->auxiliary.last_bytes_used = 0x1;
 622                 data->length = reclen;
 623                 data->operation.operation = 0x06;
 624                 break;
 625         case DASD_ECKD_CCW_READ_CKD:
 626         case DASD_ECKD_CCW_READ_CKD_MT:
 627                 data->auxiliary.last_bytes_used = 0x1;
 628                 data->length = reclen;
 629                 data->operation.operation = 0x16;
 630                 break;
 631         case DASD_ECKD_CCW_READ_COUNT:
 632                 data->operation.operation = 0x06;
 633                 break;
 634         case DASD_ECKD_CCW_ERASE:
 635                 data->length = reclen;
 636                 data->auxiliary.last_bytes_used = 0x1;
 637                 data->operation.operation = 0x0b;
 638                 break;
 639         default:
 640                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
 641                               "opcode 0x%x", cmd);
 642         }
 643         set_ch_t(&data->seek_addr,
 644                  trk / private->rdc_data.trk_per_cyl,
 645                  trk % private->rdc_data.trk_per_cyl);
 646         data->search_arg.cyl = data->seek_addr.cyl;
 647         data->search_arg.head = data->seek_addr.head;
 648         data->search_arg.record = rec_on_trk;
 649 }
 650
 651 /*
 652  * Returns 1 if the block is one of the special blocks that needs
 653  * to get read/written with the KD variant of the command.
 654  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 655  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 656  * Luckily the KD variants differ only by one bit (0x08) from the
 657  * normal variant. So don't wonder about code like:
 658  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 659  *         ccw->cmd_code |= 0x8;
 660  */
 661 static inline int
 662 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 663 {
 664         if (recid < 3)
 665                 return 1;
 666         if (recid < blk_per_trk)
 667                 return 0;
 668         if (recid < 2 * blk_per_trk)
 669                 return 1;
 670         return 0;
 671 }
 672
 673 /*
 674  * Returns the record size for the special blocks of the cdl format.
 675  * Only returns something useful if dasd_eckd_cdl_special is true
 676  * for the recid.
 677  */
 678 static inline int
 679 dasd_eckd_cdl_reclen(int recid)
 680 {
 681         if (recid < 3)
 682                 return sizes_trk0[recid];
 683         return LABEL_SIZE;
 684 }
 685
 686 /*
 687  * Generate device unique id that specifies the physical device.
 688  */
 689 static int dasd_eckd_generate_uid(struct dasd_device *device,
 690                                   struct dasd_uid *uid)
 691 {
 692         struct dasd_eckd_private *private;
 693         int count;
 694
 695         private = (struct dasd_eckd_private *) device->private;
 696         if (!private)
 697                 return -ENODEV;
 698         if (!private->ned || !private->gneq)
 699                 return -ENODEV;
 700
 701         memset(uid, 0, sizeof(struct dasd_uid));
 702         memcpy(uid->vendor, private->ned->HDA_manufacturer,
 703                sizeof(uid->vendor) - 1);
 704         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 705         memcpy(uid->serial, private->ned->HDA_location,
 706                sizeof(uid->serial) - 1);
 707         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 708         uid->ssid = private->gneq->subsystemID;
 709         uid->real_unit_addr = private->ned->unit_addr;;
 710         if (private->sneq) {
 711                 uid->type = private->sneq->sua_flags;
 712                 if (uid->type == UA_BASE_PAV_ALIAS)
 713                         uid->base_unit_addr = private->sneq->base_unit_addr;
 714         } else {
 715                 uid->type = UA_BASE_DEVICE;
 716         }
 717         if (private->vdsneq) {
 718                 for (count = 0; count < 16; count++) {
 719                         sprintf(uid->vduit+2*count, "%02x",
 720                                 private->vdsneq->uit[count]);
 721                 }
 722         }
 723         return 0;
 724 }
 725
 726 static struct dasd_ccw_req *dasd_eckd_build_rcd_lpm(struct dasd_device *device,
 727                                                     void *rcd_buffer,
 728                                                     struct ciw *ciw, __u8 lpm)
 729 {
 730         struct dasd_ccw_req *cqr;
 731         struct ccw1 *ccw;
 732
 733         cqr = dasd_smalloc_request("ECKD", 1 /* RCD */, ciw->count, device);
 734
 735         if (IS_ERR(cqr)) {
 736                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 737                               "Could not allocate RCD request");
 738                 return cqr;
 739         }
 740
 741         ccw = cqr->cpaddr;
 742         ccw->cmd_code = ciw->cmd;
 743         ccw->cda = (__u32)(addr_t)rcd_buffer;
 744         ccw->count = ciw->count;
 745
 746         cqr->startdev = device;
 747         cqr->memdev = device;
 748         cqr->block = NULL;
 749         cqr->expires = 10*HZ;
 750         cqr->lpm = lpm;
 751         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 752         cqr->retries = 2;
 753         cqr->buildclk = get_clock();
 754         cqr->status = DASD_CQR_FILLED;
 755         return cqr;
 756 }
 757
 758 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 759                                    void **rcd_buffer,
 760                                    int *rcd_buffer_size, __u8 lpm)
 761 {
 762         struct ciw *ciw;
 763         char *rcd_buf = NULL;
 764         int ret;
 765         struct dasd_ccw_req *cqr;
 766
 767         /*
 768          * scan for RCD command in extended SenseID data
 769          */
 770         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 771         if (!ciw || ciw->cmd == 0) {
 772                 ret = -EOPNOTSUPP;
 773                 goto out_error;
 774         }
 775         rcd_buf = kzalloc(ciw->count, GFP_KERNEL | GFP_DMA);
 776         if (!rcd_buf) {
 777                 ret = -ENOMEM;
 778                 goto out_error;
 779         }
 780
 781         /*
 782          * buffer has to start with EBCDIC "V1.0" to show
 783          * support for virtual device SNEQ
 784          */
 785         rcd_buf[0] = 0xE5;
 786         rcd_buf[1] = 0xF1;
 787         rcd_buf[2] = 0x4B;
 788         rcd_buf[3] = 0xF0;
 789         cqr = dasd_eckd_build_rcd_lpm(device, rcd_buf, ciw, lpm);
 790         if (IS_ERR(cqr)) {
 791                 ret =  PTR_ERR(cqr);
 792                 goto out_error;
 793         }
 794         ret = dasd_sleep_on(cqr);
 795         /*
 796          * on success we update the user input parms
 797          */
 798         dasd_sfree_request(cqr, cqr->memdev);
 799         if (ret)
 800                 goto out_error;
 801
 802         *rcd_buffer_size = ciw->count;
 803         *rcd_buffer = rcd_buf;
 804         return 0;
 805 out_error:
 806         kfree(rcd_buf);
 807         *rcd_buffer = NULL;
 808         *rcd_buffer_size = 0;
 809         return ret;
 810 }
 811
 812 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
 813 {
 814
 815         struct dasd_sneq *sneq;
 816         int i, count;
 817
 818         private->ned = NULL;
 819         private->sneq = NULL;
 820         private->vdsneq = NULL;
 821         private->gneq = NULL;
 822         count = private->conf_len / sizeof(struct dasd_sneq);
 823         sneq = (struct dasd_sneq *)private->conf_data;
 824         for (i = 0; i < count; ++i) {
 825                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 826                         private->sneq = sneq;
 827                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 828                         private->vdsneq = (struct vd_sneq *)sneq;
 829                 else if (sneq->flags.identifier == 2)
 830                         private->gneq = (struct dasd_gneq *)sneq;
 831                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 832                         private->ned = (struct dasd_ned *)sneq;
 833                 sneq++;
 834         }
 835         if (!private->ned || !private->gneq) {
 836                 private->ned = NULL;
 837                 private->sneq = NULL;
 838                 private->vdsneq = NULL;
 839                 private->gneq = NULL;
 840                 return -EINVAL;
 841         }
 842         return 0;
 843
 844 };
 845
 846 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
 847 {
 848         struct dasd_gneq *gneq;
 849         int i, count, found;
 850
 851         count = conf_len / sizeof(*gneq);
 852         gneq = (struct dasd_gneq *)conf_data;
 853         found = 0;
 854         for (i = 0; i < count; ++i) {
 855                 if (gneq->flags.identifier == 2) {
 856                         found = 1;
 857                         break;
 858                 }
 859                 gneq++;
 860         }
 861         if (found)
 862                 return ((char *)gneq)[18] & 0x07;
 863         else
 864                 return 0;
 865 }
 866
 867 static int dasd_eckd_read_conf(struct dasd_device *device)
 868 {
 869         void *conf_data;
 870         int conf_len, conf_data_saved;
 871         int rc;
 872         __u8 lpm;
 873         struct dasd_eckd_private *private;
 874         struct dasd_eckd_path *path_data;
 875
 876         private = (struct dasd_eckd_private *) device->private;
 877         path_data = (struct dasd_eckd_path *) &private->path_data;
 878         path_data->opm = ccw_device_get_path_mask(device->cdev);
 879         lpm = 0x80;
 880         conf_data_saved = 0;
 881         /* get configuration data per operational path */
 882         for (lpm = 0x80; lpm; lpm>>= 1) {
 883                 if (lpm & path_data->opm){
 884                         rc = dasd_eckd_read_conf_lpm(device, &conf_data,
 885                                                      &conf_len, lpm);
 886                         if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
 887                                 DBF_EVENT(DBF_WARNING,
 888                                           "Read configuration data returned "
 889                                           "error %d for device: %s", rc,
 890                                           dev_name(&device->cdev->dev));
 891                                 return rc;
 892                         }
 893                         if (conf_data == NULL) {
 894                                 DBF_EVENT(DBF_WARNING, "No configuration "
 895                                           "data retrieved for device: %s",
 896                                           dev_name(&device->cdev->dev));
 897                                 continue;       /* no error */
 898                         }
 899                         /* save first valid configuration data */
 900                         if (!conf_data_saved) {
 901                                 kfree(private->conf_data);
 902                                 private->conf_data = conf_data;
 903                                 private->conf_len = conf_len;
 904                                 if (dasd_eckd_identify_conf_parts(private)) {
 905                                         private->conf_data = NULL;
 906                                         private->conf_len = 0;
 907                                         kfree(conf_data);
 908                                         continue;
 909                                 }
 910                                 conf_data_saved++;
 911                         }
 912                         switch (dasd_eckd_path_access(conf_data, conf_len)) {
 913                         case 0x02:
 914                                 path_data->npm |= lpm;
 915                                 break;
 916                         case 0x03:
 917                                 path_data->ppm |= lpm;
 918                                 break;
 919                         }
 920                         if (conf_data != private->conf_data)
 921                                 kfree(conf_data);
 922                 }
 923         }
 924         return 0;
 925 }
 926
 927 static int dasd_eckd_read_features(struct dasd_device *device)
 928 {
 929         struct dasd_psf_prssd_data *prssdp;
 930         struct dasd_rssd_features *features;
 931         struct dasd_ccw_req *cqr;
 932         struct ccw1 *ccw;
 933         int rc;
 934         struct dasd_eckd_private *private;
 935
 936         private = (struct dasd_eckd_private *) device->private;
 937         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
 938                                    1 /* PSF */  + 1 /* RSSD */ ,
 939                                    (sizeof(struct dasd_psf_prssd_data) +
 940                                     sizeof(struct dasd_rssd_features)),
 941                                    device);
 942         if (IS_ERR(cqr)) {
 943                 DBF_EVENT(DBF_WARNING, "Could not allocate initialization "
 944                           "request for device: %s",
 945                           dev_name(&device->cdev->dev));
 946                 return PTR_ERR(cqr);
 947         }
 948         cqr->startdev = device;
 949         cqr->memdev = device;
 950         cqr->block = NULL;
 951         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 952         cqr->retries = 5;
 953         cqr->expires = 10 * HZ;
 954
 955         /* Prepare for Read Subsystem Data */
 956         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
 957         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
 958         prssdp->order = PSF_ORDER_PRSSD;
 959         prssdp->suborder = 0x41;        /* Read Feature Codes */
 960         /* all other bytes of prssdp must be zero */
 961
 962         ccw = cqr->cpaddr;
 963         ccw->cmd_code = DASD_ECKD_CCW_PSF;
 964         ccw->count = sizeof(struct dasd_psf_prssd_data);
 965         ccw->flags |= CCW_FLAG_CC;
 966         ccw->cda = (__u32)(addr_t) prssdp;
 967
 968         /* Read Subsystem Data - feature codes */
 969         features = (struct dasd_rssd_features *) (prssdp + 1);
 970         memset(features, 0, sizeof(struct dasd_rssd_features));
 971
 972         ccw++;
 973         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
 974         ccw->count = sizeof(struct dasd_rssd_features);
 975         ccw->cda = (__u32)(addr_t) features;
 976
 977         cqr->buildclk = get_clock();
 978         cqr->status = DASD_CQR_FILLED;
 979         rc = dasd_sleep_on(cqr);
 980         if (rc == 0) {
 981                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
 982                 features = (struct dasd_rssd_features *) (prssdp + 1);
 983                 memcpy(&private->features, features,
 984                        sizeof(struct dasd_rssd_features));
 985         }
 986         dasd_sfree_request(cqr, cqr->memdev);
 987         return rc;
 988 }
 989
 990
 991 /*
 992  * Build CP for Perform Subsystem Function - SSC.
 993  */
 994 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
 995                                                     int enable_pav)
 996 {
 997         struct dasd_ccw_req *cqr;
 998         struct dasd_psf_ssc_data *psf_ssc_data;
 999         struct ccw1 *ccw;
1000
1001         cqr = dasd_smalloc_request("ECKD", 1 /* PSF */ ,
1002                                   sizeof(struct dasd_psf_ssc_data),
1003                                   device);
1004
1005         if (IS_ERR(cqr)) {
1006                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1007                            "Could not allocate PSF-SSC request");
1008                 return cqr;
1009         }
1010         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1011         psf_ssc_data->order = PSF_ORDER_SSC;
1012         psf_ssc_data->suborder = 0x40;
1013         if (enable_pav) {
1014                 psf_ssc_data->suborder |= 0x88;
1015                 psf_ssc_data->reserved[0] = 0x88;
1016         }
1017         ccw = cqr->cpaddr;
1018         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1019         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1020         ccw->count = 66;
1021
1022         cqr->startdev = device;
1023         cqr->memdev = device;
1024         cqr->block = NULL;
1025         cqr->expires = 10*HZ;
1026         cqr->buildclk = get_clock();
1027         cqr->status = DASD_CQR_FILLED;
1028         return cqr;
1029 }
1030
1031 /*
1032  * Perform Subsystem Function.
1033  * It is necessary to trigger CIO for channel revalidation since this
1034  * call might change behaviour of DASD devices.
1035  */
1036 static int
1037 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav)
1038 {
1039         struct dasd_ccw_req *cqr;
1040         int rc;
1041
1042         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1043         if (IS_ERR(cqr))
1044                 return PTR_ERR(cqr);
1045
1046         rc = dasd_sleep_on(cqr);
1047         if (!rc)
1048                 /* trigger CIO to reprobe devices */
1049                 css_schedule_reprobe();
1050         dasd_sfree_request(cqr, cqr->memdev);
1051         return rc;
1052 }
1053
1054 /*
1055  * Valide storage server of current device.
1056  */
1057 static int dasd_eckd_validate_server(struct dasd_device *device)
1058 {
1059         int rc;
1060         struct dasd_eckd_private *private;
1061         int enable_pav;
1062
1063         if (dasd_nopav || MACHINE_IS_VM)
1064                 enable_pav = 0;
1065         else
1066                 enable_pav = 1;
1067         rc = dasd_eckd_psf_ssc(device, enable_pav);
1068         /* may be requested feature is not available on server,
1069          * therefore just report error and go ahead */
1070         private = (struct dasd_eckd_private *) device->private;
1071         DBF_EVENT(DBF_WARNING, "PSF-SSC on storage subsystem %s.%s.%04x "
1072                   "returned rc=%d for device: %s",
1073                   private->uid.vendor, private->uid.serial,
1074                   private->uid.ssid, rc, dev_name(&device->cdev->dev));
1075         /* RE-Read Configuration Data */
1076         return dasd_eckd_read_conf(device);
1077 }
1078
1079 /*
1080  * Check device characteristics.
1081  * If the device is accessible using ECKD discipline, the device is enabled.
1082  */
1083 static int
1084 dasd_eckd_check_characteristics(struct dasd_device *device)
1085 {
1086         struct dasd_eckd_private *private;
1087         struct dasd_block *block;
1088         int is_known, rc;
1089
1090         private = (struct dasd_eckd_private *) device->private;
1091         if (!private) {
1092                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1093                 if (!private) {
1094                         dev_warn(&device->cdev->dev,
1095                                  "Allocating memory for private DASD data "
1096                                  "failed\n");
1097                         return -ENOMEM;
1098                 }
1099                 device->private = (void *) private;
1100         } else {
1101                 memset(private, 0, sizeof(*private));
1102         }
1103         /* Invalidate status of initial analysis. */
1104         private->init_cqr_status = -1;
1105         /* Set default cache operations. */
1106         private->attrib.operation = DASD_NORMAL_CACHE;
1107         private->attrib.nr_cyl = 0;
1108
1109         /* Read Configuration Data */
1110         rc = dasd_eckd_read_conf(device);
1111         if (rc)
1112                 goto out_err1;
1113
1114         /* Generate device unique id and register in devmap */
1115         rc = dasd_eckd_generate_uid(device, &private->uid);
1116         if (rc)
1117                 goto out_err1;
1118         dasd_set_uid(device->cdev, &private->uid);
1119
1120         if (private->uid.type == UA_BASE_DEVICE) {
1121                 block = dasd_alloc_block();
1122                 if (IS_ERR(block)) {
1123                         DBF_EVENT(DBF_WARNING, "could not allocate dasd "
1124                                   "block structure for device: %s",
1125                                   dev_name(&device->cdev->dev));
1126                         rc = PTR_ERR(block);
1127                         goto out_err1;
1128                 }
1129                 device->block = block;
1130                 block->base = device;
1131         }
1132
1133         /* register lcu with alias handling, enable PAV if this is a new lcu */
1134         is_known = dasd_alias_make_device_known_to_lcu(device);
1135         if (is_known < 0) {
1136                 rc = is_known;
1137                 goto out_err2;
1138         }
1139         if (!is_known) {
1140                 /* new lcu found */
1141                 rc = dasd_eckd_validate_server(device); /* will switch pav on */
1142                 if (rc)
1143                         goto out_err3;
1144         }
1145
1146         /* Read Feature Codes */
1147         rc = dasd_eckd_read_features(device);
1148         if (rc)
1149                 goto out_err3;
1150
1151         /* Read Device Characteristics */
1152         rc = dasd_generic_read_dev_chars(device, "ECKD", &private->rdc_data,
1153                                          64);
1154         if (rc) {
1155                 DBF_EVENT(DBF_WARNING,
1156                           "Read device characteristics failed, rc=%d for "
1157                           "device: %s", rc, dev_name(&device->cdev->dev));
1158                 goto out_err3;
1159         }
1160         /* find the vaild cylinder size */
1161         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1162             private->rdc_data.long_no_cyl)
1163                 private->real_cyl = private->rdc_data.long_no_cyl;
1164         else
1165                 private->real_cyl = private->rdc_data.no_cyl;
1166
1167         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1168                  "with %d cylinders, %d heads, %d sectors\n",
1169                  private->rdc_data.dev_type,
1170                  private->rdc_data.dev_model,
1171                  private->rdc_data.cu_type,
1172                  private->rdc_data.cu_model.model,
1173                  private->real_cyl,
1174                  private->rdc_data.trk_per_cyl,
1175                  private->rdc_data.sec_per_trk);
1176         return 0;
1177
1178 out_err3:
1179         dasd_alias_disconnect_device_from_lcu(device);
1180 out_err2:
1181         dasd_free_block(device->block);
1182         device->block = NULL;
1183 out_err1:
1184         kfree(private->conf_data);
1185         kfree(device->private);
1186         device->private = NULL;
1187         return rc;
1188 }
1189
1190 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1191 {
1192         struct dasd_eckd_private *private;
1193
1194         private = (struct dasd_eckd_private *) device->private;
1195         dasd_alias_disconnect_device_from_lcu(device);
1196         private->ned = NULL;
1197         private->sneq = NULL;
1198         private->vdsneq = NULL;
1199         private->gneq = NULL;
1200         private->conf_len = 0;
1201         kfree(private->conf_data);
1202         private->conf_data = NULL;
1203 }
1204
1205 static struct dasd_ccw_req *
1206 dasd_eckd_analysis_ccw(struct dasd_device *device)
1207 {
1208         struct dasd_eckd_private *private;
1209         struct eckd_count *count_data;
1210         struct LO_eckd_data *LO_data;
1211         struct dasd_ccw_req *cqr;
1212         struct ccw1 *ccw;
1213         int cplength, datasize;
1214         int i;
1215
1216         private = (struct dasd_eckd_private *) device->private;
1217
1218         cplength = 8;
1219         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1220         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1221                                    cplength, datasize, device);
1222         if (IS_ERR(cqr))
1223                 return cqr;
1224         ccw = cqr->cpaddr;
1225         /* Define extent for the first 3 tracks. */
1226         define_extent(ccw++, cqr->data, 0, 2,
1227                       DASD_ECKD_CCW_READ_COUNT, device);
1228         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1229         /* Locate record for the first 4 records on track 0. */
1230         ccw[-1].flags |= CCW_FLAG_CC;
1231         locate_record(ccw++, LO_data++, 0, 0, 4,
1232                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1233
1234         count_data = private->count_area;
1235         for (i = 0; i < 4; i++) {
1236                 ccw[-1].flags |= CCW_FLAG_CC;
1237                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1238                 ccw->flags = 0;
1239                 ccw->count = 8;
1240                 ccw->cda = (__u32)(addr_t) count_data;
1241                 ccw++;
1242                 count_data++;
1243         }
1244
1245         /* Locate record for the first record on track 2. */
1246         ccw[-1].flags |= CCW_FLAG_CC;
1247         locate_record(ccw++, LO_data++, 2, 0, 1,
1248                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1249         /* Read count ccw. */
1250         ccw[-1].flags |= CCW_FLAG_CC;
1251         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1252         ccw->flags = 0;
1253         ccw->count = 8;
1254         ccw->cda = (__u32)(addr_t) count_data;
1255
1256         cqr->block = NULL;
1257         cqr->startdev = device;
1258         cqr->memdev = device;
1259         cqr->retries = 0;
1260         cqr->buildclk = get_clock();
1261         cqr->status = DASD_CQR_FILLED;
1262         return cqr;
1263 }
1264
1265 /*
1266  * This is the callback function for the init_analysis cqr. It saves
1267  * the status of the initial analysis ccw before it frees it and kicks
1268  * the device to continue the startup sequence. This will call
1269  * dasd_eckd_do_analysis again (if the devices has not been marked
1270  * for deletion in the meantime).
1271  */
1272 static void
1273 dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, void *data)
1274 {
1275         struct dasd_eckd_private *private;
1276         struct dasd_device *device;
1277
1278         device = init_cqr->startdev;
1279         private = (struct dasd_eckd_private *) device->private;
1280         private->init_cqr_status = init_cqr->status;
1281         dasd_sfree_request(init_cqr, device);
1282         dasd_kick_device(device);
1283 }
1284
1285 static int
1286 dasd_eckd_start_analysis(struct dasd_block *block)
1287 {
1288         struct dasd_eckd_private *private;
1289         struct dasd_ccw_req *init_cqr;
1290
1291         private = (struct dasd_eckd_private *) block->base->private;
1292         init_cqr = dasd_eckd_analysis_ccw(block->base);
1293         if (IS_ERR(init_cqr))
1294                 return PTR_ERR(init_cqr);
1295         init_cqr->callback = dasd_eckd_analysis_callback;
1296         init_cqr->callback_data = NULL;
1297         init_cqr->expires = 5*HZ;
1298         dasd_add_request_head(init_cqr);
1299         return -EAGAIN;
1300 }
1301
1302 static int
1303 dasd_eckd_end_analysis(struct dasd_block *block)
1304 {
1305         struct dasd_device *device;
1306         struct dasd_eckd_private *private;
1307         struct eckd_count *count_area;
1308         unsigned int sb, blk_per_trk;
1309         int status, i;
1310
1311         device = block->base;
1312         private = (struct dasd_eckd_private *) device->private;
1313         status = private->init_cqr_status;
1314         private->init_cqr_status = -1;
1315         if (status != DASD_CQR_DONE) {
1316                 dev_warn(&device->cdev->dev,
1317                             "The DASD is not formatted\n");
1318                 return -EMEDIUMTYPE;
1319         }
1320
1321         private->uses_cdl = 1;
1322         /* Check Track 0 for Compatible Disk Layout */
1323         count_area = NULL;
1324         for (i = 0; i < 3; i++) {
1325                 if (private->count_area[i].kl != 4 ||
1326                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
1327                         private->uses_cdl = 0;
1328                         break;
1329                 }
1330         }
1331         if (i == 3)
1332                 count_area = &private->count_area[4];
1333
1334         if (private->uses_cdl == 0) {
1335                 for (i = 0; i < 5; i++) {
1336                         if ((private->count_area[i].kl != 0) ||
1337                             (private->count_area[i].dl !=
1338                              private->count_area[0].dl))
1339                                 break;
1340                 }
1341                 if (i == 5)
1342                         count_area = &private->count_area[0];
1343         } else {
1344                 if (private->count_area[3].record == 1)
1345                         dev_warn(&device->cdev->dev,
1346                                  "Track 0 has no records following the VTOC\n");
1347         }
1348         if (count_area != NULL && count_area->kl == 0) {
1349                 /* we found notthing violating our disk layout */
1350                 if (dasd_check_blocksize(count_area->dl) == 0)
1351                         block->bp_block = count_area->dl;
1352         }
1353         if (block->bp_block == 0) {
1354                 dev_warn(&device->cdev->dev,
1355                          "The disk layout of the DASD is not supported\n");
1356                 return -EMEDIUMTYPE;
1357         }
1358         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1359         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1360                 block->s2b_shift++;
1361
1362         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1363         block->blocks = (private->real_cyl *
1364                           private->rdc_data.trk_per_cyl *
1365                           blk_per_trk);
1366
1367         dev_info(&device->cdev->dev,
1368                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
1369                  "%s\n", (block->bp_block >> 10),
1370                  ((private->real_cyl *
1371                    private->rdc_data.trk_per_cyl *
1372                    blk_per_trk * (block->bp_block >> 9)) >> 1),
1373                  ((blk_per_trk * block->bp_block) >> 10),
1374                  private->uses_cdl ?
1375                  "compatible disk layout" : "linux disk layout");
1376
1377         return 0;
1378 }
1379
1380 static int dasd_eckd_do_analysis(struct dasd_block *block)
1381 {
1382         struct dasd_eckd_private *private;
1383
1384         private = (struct dasd_eckd_private *) block->base->private;
1385         if (private->init_cqr_status < 0)
1386                 return dasd_eckd_start_analysis(block);
1387         else
1388                 return dasd_eckd_end_analysis(block);
1389 }
1390
1391 static int dasd_eckd_ready_to_online(struct dasd_device *device)
1392 {
1393         return dasd_alias_add_device(device);
1394 };
1395
1396 static int dasd_eckd_online_to_ready(struct dasd_device *device)
1397 {
1398         return dasd_alias_remove_device(device);
1399 };
1400
1401 static int
1402 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
1403 {
1404         struct dasd_eckd_private *private;
1405
1406         private = (struct dasd_eckd_private *) block->base->private;
1407         if (dasd_check_blocksize(block->bp_block) == 0) {
1408                 geo->sectors = recs_per_track(&private->rdc_data,
1409                                               0, block->bp_block);
1410         }
1411         geo->cylinders = private->rdc_data.no_cyl;
1412         geo->heads = private->rdc_data.trk_per_cyl;
1413         return 0;
1414 }
1415
1416 static struct dasd_ccw_req *
1417 dasd_eckd_format_device(struct dasd_device * device,
1418                         struct format_data_t * fdata)
1419 {
1420         struct dasd_eckd_private *private;
1421         struct dasd_ccw_req *fcp;
1422         struct eckd_count *ect;
1423         struct ccw1 *ccw;
1424         void *data;
1425         int rpt;
1426         struct ch_t address;
1427         int cplength, datasize;
1428         int i;
1429         int intensity = 0;
1430         int r0_perm;
1431
1432         private = (struct dasd_eckd_private *) device->private;
1433         rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
1434         set_ch_t(&address,
1435                  fdata->start_unit / private->rdc_data.trk_per_cyl,
1436                  fdata->start_unit % private->rdc_data.trk_per_cyl);
1437
1438         /* Sanity checks. */
1439         if (fdata->start_unit >=
1440             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
1441                 dev_warn(&device->cdev->dev, "Start track number %d used in "
1442                          "formatting is too big\n", fdata->start_unit);
1443                 return ERR_PTR(-EINVAL);
1444         }
1445         if (fdata->start_unit > fdata->stop_unit) {
1446                 dev_warn(&device->cdev->dev, "Start track %d used in "
1447                          "formatting exceeds end track\n", fdata->start_unit);
1448                 return ERR_PTR(-EINVAL);
1449         }
1450         if (dasd_check_blocksize(fdata->blksize) != 0) {
1451                 dev_warn(&device->cdev->dev,
1452                          "The DASD cannot be formatted with block size %d\n",
1453                          fdata->blksize);
1454                 return ERR_PTR(-EINVAL);
1455         }
1456
1457         /*
1458          * fdata->intensity is a bit string that tells us what to do:
1459          *   Bit 0: write record zero
1460          *   Bit 1: write home address, currently not supported
1461          *   Bit 2: invalidate tracks
1462          *   Bit 3: use OS/390 compatible disk layout (cdl)
1463          *   Bit 4: do not allow storage subsystem to modify record zero
1464          * Only some bit combinations do make sense.
1465          */
1466         if (fdata->intensity & 0x10) {
1467                 r0_perm = 0;
1468                 intensity = fdata->intensity & ~0x10;
1469         } else {
1470                 r0_perm = 1;
1471                 intensity = fdata->intensity;
1472         }
1473         switch (intensity) {
1474         case 0x00:      /* Normal format */
1475         case 0x08:      /* Normal format, use cdl. */
1476                 cplength = 2 + rpt;
1477                 datasize = sizeof(struct DE_eckd_data) +
1478                         sizeof(struct LO_eckd_data) +
1479                         rpt * sizeof(struct eckd_count);
1480                 break;
1481         case 0x01:      /* Write record zero and format track. */
1482         case 0x09:      /* Write record zero and format track, use cdl. */
1483                 cplength = 3 + rpt;
1484                 datasize = sizeof(struct DE_eckd_data) +
1485                         sizeof(struct LO_eckd_data) +
1486                         sizeof(struct eckd_count) +
1487                         rpt * sizeof(struct eckd_count);
1488                 break;
1489         case 0x04:      /* Invalidate track. */
1490         case 0x0c:      /* Invalidate track, use cdl. */
1491                 cplength = 3;
1492                 datasize = sizeof(struct DE_eckd_data) +
1493                         sizeof(struct LO_eckd_data) +
1494                         sizeof(struct eckd_count);
1495                 break;
1496         default:
1497                 dev_warn(&device->cdev->dev, "An I/O control call used "
1498                          "incorrect flags 0x%x\n", fdata->intensity);
1499                 return ERR_PTR(-EINVAL);
1500         }
1501         /* Allocate the format ccw request. */
1502         fcp = dasd_smalloc_request(dasd_eckd_discipline.name,
1503                                    cplength, datasize, device);
1504         if (IS_ERR(fcp))
1505                 return fcp;
1506
1507         data = fcp->data;
1508         ccw = fcp->cpaddr;
1509
1510         switch (intensity & ~0x08) {
1511         case 0x00: /* Normal format. */
1512                 define_extent(ccw++, (struct DE_eckd_data *) data,
1513                               fdata->start_unit, fdata->start_unit,
1514                               DASD_ECKD_CCW_WRITE_CKD, device);
1515                 /* grant subsystem permission to format R0 */
1516                 if (r0_perm)
1517                         ((struct DE_eckd_data *)data)->ga_extended |= 0x04;
1518                 data += sizeof(struct DE_eckd_data);
1519                 ccw[-1].flags |= CCW_FLAG_CC;
1520                 locate_record(ccw++, (struct LO_eckd_data *) data,
1521                               fdata->start_unit, 0, rpt,
1522                               DASD_ECKD_CCW_WRITE_CKD, device,
1523                               fdata->blksize);
1524                 data += sizeof(struct LO_eckd_data);
1525                 break;
1526         case 0x01: /* Write record zero + format track. */
1527                 define_extent(ccw++, (struct DE_eckd_data *) data,
1528                               fdata->start_unit, fdata->start_unit,
1529                               DASD_ECKD_CCW_WRITE_RECORD_ZERO,
1530                               device);
1531                 data += sizeof(struct DE_eckd_data);
1532                 ccw[-1].flags |= CCW_FLAG_CC;
1533                 locate_record(ccw++, (struct LO_eckd_data *) data,
1534                               fdata->start_unit, 0, rpt + 1,
1535                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
1536                               device->block->bp_block);
1537                 data += sizeof(struct LO_eckd_data);
1538                 break;
1539         case 0x04: /* Invalidate track. */
1540                 define_extent(ccw++, (struct DE_eckd_data *) data,
1541                               fdata->start_unit, fdata->start_unit,
1542                               DASD_ECKD_CCW_WRITE_CKD, device);
1543                 data += sizeof(struct DE_eckd_data);
1544                 ccw[-1].flags |= CCW_FLAG_CC;
1545                 locate_record(ccw++, (struct LO_eckd_data *) data,
1546                               fdata->start_unit, 0, 1,
1547                               DASD_ECKD_CCW_WRITE_CKD, device, 8);
1548                 data += sizeof(struct LO_eckd_data);
1549                 break;
1550         }
1551         if (intensity & 0x01) { /* write record zero */
1552                 ect = (struct eckd_count *) data;
1553                 data += sizeof(struct eckd_count);
1554                 ect->cyl = address.cyl;
1555                 ect->head = address.head;
1556                 ect->record = 0;
1557                 ect->kl = 0;
1558                 ect->dl = 8;
1559                 ccw[-1].flags |= CCW_FLAG_CC;
1560                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
1561                 ccw->flags = CCW_FLAG_SLI;
1562                 ccw->count = 8;
1563                 ccw->cda = (__u32)(addr_t) ect;
1564                 ccw++;
1565         }
1566         if ((intensity & ~0x08) & 0x04) {       /* erase track */
1567                 ect = (struct eckd_count *) data;
1568                 data += sizeof(struct eckd_count);
1569                 ect->cyl = address.cyl;
1570                 ect->head = address.head;
1571                 ect->record = 1;
1572                 ect->kl = 0;
1573                 ect->dl = 0;
1574                 ccw[-1].flags |= CCW_FLAG_CC;
1575                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1576                 ccw->flags = CCW_FLAG_SLI;
1577                 ccw->count = 8;
1578                 ccw->cda = (__u32)(addr_t) ect;
1579         } else {                /* write remaining records */
1580                 for (i = 0; i < rpt; i++) {
1581                         ect = (struct eckd_count *) data;
1582                         data += sizeof(struct eckd_count);
1583                         ect->cyl = address.cyl;
1584                         ect->head = address.head;
1585                         ect->record = i + 1;
1586                         ect->kl = 0;
1587                         ect->dl = fdata->blksize;
1588                         /* Check for special tracks 0-1 when formatting CDL */
1589                         if ((intensity & 0x08) &&
1590                             fdata->start_unit == 0) {
1591                                 if (i < 3) {
1592                                         ect->kl = 4;
1593                                         ect->dl = sizes_trk0[i] - 4;
1594                                 }
1595                         }
1596                         if ((intensity & 0x08) &&
1597                             fdata->start_unit == 1) {
1598                                 ect->kl = 44;
1599                                 ect->dl = LABEL_SIZE - 44;
1600                         }
1601                         ccw[-1].flags |= CCW_FLAG_CC;
1602                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1603                         ccw->flags = CCW_FLAG_SLI;
1604                         ccw->count = 8;
1605                         ccw->cda = (__u32)(addr_t) ect;
1606                         ccw++;
1607                 }
1608         }
1609         fcp->startdev = device;
1610         fcp->memdev = device;
1611         clear_bit(DASD_CQR_FLAGS_USE_ERP, &fcp->flags);
1612         fcp->retries = 5;       /* set retry counter to enable default ERP */
1613         fcp->buildclk = get_clock();
1614         fcp->status = DASD_CQR_FILLED;
1615         return fcp;
1616 }
1617
1618 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
1619 {
1620         cqr->status = DASD_CQR_FILLED;
1621         if (cqr->block && (cqr->startdev != cqr->block->base)) {
1622                 dasd_eckd_reset_ccw_to_base_io(cqr);
1623                 cqr->startdev = cqr->block->base;
1624         }
1625 };
1626
1627 static dasd_erp_fn_t
1628 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
1629 {
1630         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
1631         struct ccw_device *cdev = device->cdev;
1632
1633         switch (cdev->id.cu_type) {
1634         case 0x3990:
1635         case 0x2105:
1636         case 0x2107:
1637         case 0x1750:
1638                 return dasd_3990_erp_action;
1639         case 0x9343:
1640         case 0x3880:
1641         default:
1642                 return dasd_default_erp_action;
1643         }
1644 }
1645
1646 static dasd_erp_fn_t
1647 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
1648 {
1649         return dasd_default_erp_postaction;
1650 }
1651
1652
1653 static void dasd_eckd_handle_unsolicited_interrupt(struct dasd_device *device,
1654                                                    struct irb *irb)
1655 {
1656         char mask;
1657         char *sense = NULL;
1658
1659         /* first of all check for state change pending interrupt */
1660         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
1661         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
1662                 dasd_generic_handle_state_change(device);
1663                 return;
1664         }
1665
1666         /* summary unit check */
1667         if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
1668             (irb->ecw[7] == 0x0D)) {
1669                 dasd_alias_handle_summary_unit_check(device, irb);
1670                 return;
1671         }
1672
1673         sense = dasd_get_sense(irb);
1674         /* service information message SIM */
1675         if (sense && !(sense[27] & DASD_SENSE_BIT_0) &&
1676             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
1677                 dasd_3990_erp_handle_sim(device, sense);
1678                 dasd_schedule_device_bh(device);
1679                 return;
1680         }
1681
1682         if ((scsw_cc(&irb->scsw) == 1) &&
1683             (scsw_fctl(&irb->scsw) & SCSW_FCTL_START_FUNC) &&
1684             (scsw_actl(&irb->scsw) & SCSW_ACTL_START_PEND) &&
1685             (scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND)) {
1686                 /* fake irb do nothing, they are handled elsewhere */
1687                 dasd_schedule_device_bh(device);
1688                 return;
1689         }
1690
1691         if (!sense) {
1692                 /* just report other unsolicited interrupts */
1693                 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1694                             "unsolicited interrupt received");
1695         } else {
1696                 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1697                             "unsolicited interrupt received "
1698                             "(sense available)");
1699                 device->discipline->dump_sense_dbf(device, irb, "unsolicited");
1700         }
1701
1702         dasd_schedule_device_bh(device);
1703         return;
1704 };
1705
1706
1707 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
1708                                                struct dasd_device *startdev,
1709                                                struct dasd_block *block,
1710                                                struct request *req,
1711                                                sector_t first_rec,
1712                                                sector_t last_rec,
1713                                                sector_t first_trk,
1714                                                sector_t last_trk,
1715                                                unsigned int first_offs,
1716                                                unsigned int last_offs,
1717                                                unsigned int blk_per_trk,
1718                                                unsigned int blksize)
1719 {
1720         struct dasd_eckd_private *private;
1721         unsigned long *idaws;
1722         struct LO_eckd_data *LO_data;
1723         struct dasd_ccw_req *cqr;
1724         struct ccw1 *ccw;
1725         struct req_iterator iter;
1726         struct bio_vec *bv;
1727         char *dst;
1728         unsigned int off;
1729         int count, cidaw, cplength, datasize;
1730         sector_t recid;
1731         unsigned char cmd, rcmd;
1732         int use_prefix;
1733         struct dasd_device *basedev;
1734
1735         basedev = block->base;
1736         private = (struct dasd_eckd_private *) basedev->private;
1737         if (rq_data_dir(req) == READ)
1738                 cmd = DASD_ECKD_CCW_READ_MT;
1739         else if (rq_data_dir(req) == WRITE)
1740                 cmd = DASD_ECKD_CCW_WRITE_MT;
1741         else
1742                 return ERR_PTR(-EINVAL);
1743
1744         /* Check struct bio and count the number of blocks for the request. */
1745         count = 0;
1746         cidaw = 0;
1747         rq_for_each_segment(bv, req, iter) {
1748                 if (bv->bv_len & (blksize - 1))
1749                         /* Eckd can only do full blocks. */
1750                         return ERR_PTR(-EINVAL);
1751                 count += bv->bv_len >> (block->s2b_shift + 9);
1752 #if defined(CONFIG_64BIT)
1753                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
1754                         cidaw += bv->bv_len >> (block->s2b_shift + 9);
1755 #endif
1756         }
1757         /* Paranoia. */
1758         if (count != last_rec - first_rec + 1)
1759                 return ERR_PTR(-EINVAL);
1760
1761         /* use the prefix command if available */
1762         use_prefix = private->features.feature[8] & 0x01;
1763         if (use_prefix) {
1764                 /* 1x prefix + number of blocks */
1765                 cplength = 2 + count;
1766                 /* 1x prefix + cidaws*sizeof(long) */
1767                 datasize = sizeof(struct PFX_eckd_data) +
1768                         sizeof(struct LO_eckd_data) +
1769                         cidaw * sizeof(unsigned long);
1770         } else {
1771                 /* 1x define extent + 1x locate record + number of blocks */
1772                 cplength = 2 + count;
1773                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
1774                 datasize = sizeof(struct DE_eckd_data) +
1775                         sizeof(struct LO_eckd_data) +
1776                         cidaw * sizeof(unsigned long);
1777         }
1778         /* Find out the number of additional locate record ccws for cdl. */
1779         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
1780                 if (last_rec >= 2*blk_per_trk)
1781                         count = 2*blk_per_trk - first_rec;
1782                 cplength += count;
1783                 datasize += count*sizeof(struct LO_eckd_data);
1784         }
1785         /* Allocate the ccw request. */
1786         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1787                                    cplength, datasize, startdev);
1788         if (IS_ERR(cqr))
1789                 return cqr;
1790         ccw = cqr->cpaddr;
1791         /* First ccw is define extent or prefix. */
1792         if (use_prefix) {
1793                 if (prefix(ccw++, cqr->data, first_trk,
1794                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
1795                         /* Clock not in sync and XRC is enabled.
1796                          * Try again later.
1797                          */
1798                         dasd_sfree_request(cqr, startdev);
1799                         return ERR_PTR(-EAGAIN);
1800                 }
1801                 idaws = (unsigned long *) (cqr->data +
1802                                            sizeof(struct PFX_eckd_data));
1803         } else {
1804                 if (define_extent(ccw++, cqr->data, first_trk,
1805                                   last_trk, cmd, startdev) == -EAGAIN) {
1806                         /* Clock not in sync and XRC is enabled.
1807                          * Try again later.
1808                          */
1809                         dasd_sfree_request(cqr, startdev);
1810                         return ERR_PTR(-EAGAIN);
1811                 }
1812                 idaws = (unsigned long *) (cqr->data +
1813                                            sizeof(struct DE_eckd_data));
1814         }
1815         /* Build locate_record+read/write/ccws. */
1816         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
1817         recid = first_rec;
1818         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
1819                 /* Only standard blocks so there is just one locate record. */
1820                 ccw[-1].flags |= CCW_FLAG_CC;
1821                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
1822                               last_rec - recid + 1, cmd, basedev, blksize);
1823         }
1824         rq_for_each_segment(bv, req, iter) {
1825                 dst = page_address(bv->bv_page) + bv->bv_offset;
1826                 if (dasd_page_cache) {
1827                         char *copy = kmem_cache_alloc(dasd_page_cache,
1828                                                       GFP_DMA | __GFP_NOWARN);
1829                         if (copy && rq_data_dir(req) == WRITE)
1830                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
1831                         if (copy)
1832                                 dst = copy + bv->bv_offset;
1833                 }
1834                 for (off = 0; off < bv->bv_len; off += blksize) {
1835                         sector_t trkid = recid;
1836                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
1837                         rcmd = cmd;
1838                         count = blksize;
1839                         /* Locate record for cdl special block ? */
1840                         if (private->uses_cdl && recid < 2*blk_per_trk) {
1841                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
1842                                         rcmd |= 0x8;
1843                                         count = dasd_eckd_cdl_reclen(recid);
1844                                         if (count < blksize &&
1845                                             rq_data_dir(req) == READ)
1846                                                 memset(dst + count, 0xe5,
1847                                                        blksize - count);
1848                                 }
1849                                 ccw[-1].flags |= CCW_FLAG_CC;
1850                                 locate_record(ccw++, LO_data++,
1851                                               trkid, recoffs + 1,
1852                                               1, rcmd, basedev, count);
1853                         }
1854                         /* Locate record for standard blocks ? */
1855                         if (private->uses_cdl && recid == 2*blk_per_trk) {
1856                                 ccw[-1].flags |= CCW_FLAG_CC;
1857                                 locate_record(ccw++, LO_data++,
1858                                               trkid, recoffs + 1,
1859                                               last_rec - recid + 1,
1860                                               cmd, basedev, count);
1861                         }
1862                         /* Read/write ccw. */
1863                         ccw[-1].flags |= CCW_FLAG_CC;
1864                         ccw->cmd_code = rcmd;
1865                         ccw->count = count;
1866                         if (idal_is_needed(dst, blksize)) {
1867                                 ccw->cda = (__u32)(addr_t) idaws;
1868                                 ccw->flags = CCW_FLAG_IDA;
1869                                 idaws = idal_create_words(idaws, dst, blksize);
1870                         } else {
1871                                 ccw->cda = (__u32)(addr_t) dst;
1872                                 ccw->flags = 0;
1873                         }
1874                         ccw++;
1875                         dst += blksize;
1876                         recid++;
1877                 }
1878         }
1879         if (blk_noretry_request(req) ||
1880             block->base->features & DASD_FEATURE_FAILFAST)
1881                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1882         cqr->startdev = startdev;
1883         cqr->memdev = startdev;
1884         cqr->block = block;
1885         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
1886         cqr->lpm = private->path_data.ppm;
1887         cqr->retries = 256;
1888         cqr->buildclk = get_clock();
1889         cqr->status = DASD_CQR_FILLED;
1890         return cqr;
1891 }
1892
1893 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
1894                                                struct dasd_device *startdev,
1895                                                struct dasd_block *block,
1896                                                struct request *req,
1897                                                sector_t first_rec,
1898                                                sector_t last_rec,
1899                                                sector_t first_trk,
1900                                                sector_t last_trk,
1901                                                unsigned int first_offs,
1902                                                unsigned int last_offs,
1903                                                unsigned int blk_per_trk,
1904                                                unsigned int blksize)
1905 {
1906         struct dasd_eckd_private *private;
1907         unsigned long *idaws;
1908         struct dasd_ccw_req *cqr;
1909         struct ccw1 *ccw;
1910         struct req_iterator iter;
1911         struct bio_vec *bv;
1912         char *dst, *idaw_dst;
1913         unsigned int cidaw, cplength, datasize;
1914         unsigned int tlf;
1915         sector_t recid;
1916         unsigned char cmd;
1917         struct dasd_device *basedev;
1918         unsigned int trkcount, count, count_to_trk_end;
1919         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
1920         unsigned char new_track, end_idaw;
1921         sector_t trkid;
1922         unsigned int recoffs;
1923
1924         basedev = block->base;
1925         private = (struct dasd_eckd_private *) basedev->private;
1926         if (rq_data_dir(req) == READ)
1927                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
1928         else if (rq_data_dir(req) == WRITE)
1929                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
1930         else
1931                 return ERR_PTR(-EINVAL);
1932
1933         /* Track based I/O needs IDAWs for each page, and not just for
1934          * 64 bit addresses. We need additional idals for pages
1935          * that get filled from two tracks, so we use the number
1936          * of records as upper limit.
1937          */
1938         cidaw = last_rec - first_rec + 1;
1939         trkcount = last_trk - first_trk + 1;
1940
1941         /* 1x prefix + one read/write ccw per track */
1942         cplength = 1 + trkcount;
1943
1944         /* on 31-bit we need space for two 32 bit addresses per page
1945          * on 64-bit one 64 bit address
1946          */
1947         datasize = sizeof(struct PFX_eckd_data) +
1948                 cidaw * sizeof(unsigned long long);
1949
1950         /* Allocate the ccw request. */
1951         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1952                                    cplength, datasize, startdev);
1953         if (IS_ERR(cqr))
1954                 return cqr;
1955         ccw = cqr->cpaddr;
1956         /* transfer length factor: how many bytes to read from the last track */
1957         if (first_trk == last_trk)
1958                 tlf = last_offs - first_offs + 1;
1959         else
1960                 tlf = last_offs + 1;
1961         tlf *= blksize;
1962
1963         if (prefix_LRE(ccw++, cqr->data, first_trk,
1964                        last_trk, cmd, basedev, startdev,
1965                        1 /* format */, first_offs + 1,
1966                        trkcount, blksize,
1967                        tlf) == -EAGAIN) {
1968                 /* Clock not in sync and XRC is enabled.
1969                  * Try again later.
1970                  */
1971                 dasd_sfree_request(cqr, startdev);
1972                 return ERR_PTR(-EAGAIN);
1973         }
1974
1975         /*
1976          * The translation of request into ccw programs must meet the
1977          * following conditions:
1978          * - all idaws but the first and the last must address full pages
1979          *   (or 2K blocks on 31-bit)
1980          * - the scope of a ccw and it's idal ends with the track boundaries
1981          */
1982         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
1983         recid = first_rec;
1984         new_track = 1;
1985         end_idaw = 0;
1986         len_to_track_end = 0;
1987         idaw_dst = 0;
1988         idaw_len = 0;
1989         rq_for_each_segment(bv, req, iter) {
1990                 dst = page_address(bv->bv_page) + bv->bv_offset;
1991                 seg_len = bv->bv_len;
1992                 while (seg_len) {
1993                         if (new_track) {
1994                                 trkid = recid;
1995                                 recoffs = sector_div(trkid, blk_per_trk);
1996                                 count_to_trk_end = blk_per_trk - recoffs;
1997                                 count = min((last_rec - recid + 1),
1998                                             (sector_t)count_to_trk_end);
1999                                 len_to_track_end = count * blksize;
2000                                 ccw[-1].flags |= CCW_FLAG_CC;
2001                                 ccw->cmd_code = cmd;
2002                                 ccw->count = len_to_track_end;
2003                                 ccw->cda = (__u32)(addr_t)idaws;
2004                                 ccw->flags = CCW_FLAG_IDA;
2005                                 ccw++;
2006                                 recid += count;
2007                                 new_track = 0;
2008                                 /* first idaw for a ccw may start anywhere */
2009                                 if (!idaw_dst)
2010                                         idaw_dst = dst;
2011                         }
2012                         /* If we start a new idaw, we must make sure that it
2013                          * starts on an IDA_BLOCK_SIZE boundary.
2014                          * If we continue an idaw, we must make sure that the
2015                          * current segment begins where the so far accumulated
2016                          * idaw ends
2017                          */
2018                         if (!idaw_dst) {
2019                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2020                                         dasd_sfree_request(cqr, startdev);
2021                                         return ERR_PTR(-ERANGE);
2022                                 } else
2023                                         idaw_dst = dst;
2024                         }
2025                         if ((idaw_dst + idaw_len) != dst) {
2026                                 dasd_sfree_request(cqr, startdev);
2027                                 return ERR_PTR(-ERANGE);
2028                         }
2029                         part_len = min(seg_len, len_to_track_end);
2030                         seg_len -= part_len;
2031                         dst += part_len;
2032                         idaw_len += part_len;
2033                         len_to_track_end -= part_len;
2034                         /* collected memory area ends on an IDA_BLOCK border,
2035                          * -> create an idaw
2036                          * idal_create_words will handle cases where idaw_len
2037                          * is larger then IDA_BLOCK_SIZE
2038                          */
2039                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2040                                 end_idaw = 1;
2041                         /* We also need to end the idaw at track end */
2042                         if (!len_to_track_end) {
2043                                 new_track = 1;
2044                                 end_idaw = 1;
2045                         }
2046                         if (end_idaw) {
2047                                 idaws = idal_create_words(idaws, idaw_dst,
2048                                                           idaw_len);
2049                                 idaw_dst = 0;
2050                                 idaw_len = 0;
2051                                 end_idaw = 0;
2052                         }
2053                 }
2054         }
2055
2056         if (blk_noretry_request(req) ||
2057             block->base->features & DASD_FEATURE_FAILFAST)
2058                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2059         cqr->startdev = startdev;
2060         cqr->memdev = startdev;
2061         cqr->block = block;
2062         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
2063         cqr->lpm = private->path_data.ppm;
2064         cqr->retries = 256;
2065         cqr->buildclk = get_clock();
2066         cqr->status = DASD_CQR_FILLED;
2067         return cqr;
2068 }
2069
2070 static int prepare_itcw(struct itcw *itcw,
2071                         unsigned int trk, unsigned int totrk, int cmd,
2072                         struct dasd_device *basedev,
2073                         struct dasd_device *startdev,
2074                         unsigned int rec_on_trk, int count,
2075                         unsigned int blksize,
2076                         unsigned int total_data_size,
2077                         unsigned int tlf,
2078                         unsigned int blk_per_trk)
2079 {
2080         struct PFX_eckd_data pfxdata;
2081         struct dasd_eckd_private *basepriv, *startpriv;
2082         struct DE_eckd_data *dedata;
2083         struct LRE_eckd_data *lredata;
2084         struct dcw *dcw;
2085
2086         u32 begcyl, endcyl;
2087         u16 heads, beghead, endhead;
2088         u8 pfx_cmd;
2089
2090         int rc = 0;
2091         int sector = 0;
2092         int dn, d;
2093
2094
2095         /* setup prefix data */
2096         basepriv = (struct dasd_eckd_private *) basedev->private;
2097         startpriv = (struct dasd_eckd_private *) startdev->private;
2098         dedata = &pfxdata.define_extent;
2099         lredata = &pfxdata.locate_record;
2100
2101         memset(&pfxdata, 0, sizeof(pfxdata));
2102         pfxdata.format = 1; /* PFX with LRE */
2103         pfxdata.base_address = basepriv->ned->unit_addr;
2104         pfxdata.base_lss = basepriv->ned->ID;
2105         pfxdata.validity.define_extent = 1;
2106
2107         /* private uid is kept up to date, conf_data may be outdated */
2108         if (startpriv->uid.type != UA_BASE_DEVICE) {
2109                 pfxdata.validity.verify_base = 1;
2110                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2111                         pfxdata.validity.hyper_pav = 1;
2112         }
2113
2114         switch (cmd) {
2115         case DASD_ECKD_CCW_READ_TRACK_DATA:
2116                 dedata->mask.perm = 0x1;
2117                 dedata->attributes.operation = basepriv->attrib.operation;
2118                 dedata->blk_size = blksize;
2119                 dedata->ga_extended |= 0x42;
2120                 lredata->operation.orientation = 0x0;
2121                 lredata->operation.operation = 0x0C;
2122                 lredata->auxiliary.check_bytes = 0x01;
2123                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2124                 break;
2125         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2126                 dedata->mask.perm = 0x02;
2127                 dedata->attributes.operation = basepriv->attrib.operation;
2128                 dedata->blk_size = blksize;
2129                 rc = check_XRC_on_prefix(&pfxdata, basedev);
2130                 dedata->ga_extended |= 0x42;
2131                 lredata->operation.orientation = 0x0;
2132                 lredata->operation.operation = 0x3F;
2133                 lredata->extended_operation = 0x23;
2134                 lredata->auxiliary.check_bytes = 0x2;
2135                 pfx_cmd = DASD_ECKD_CCW_PFX;
2136                 break;
2137         default:
2138                 DBF_DEV_EVENT(DBF_ERR, basedev,
2139                               "prepare itcw, unknown opcode 0x%x", cmd);
2140                 BUG();
2141                 break;
2142         }
2143         if (rc)
2144                 return rc;
2145
2146         dedata->attributes.mode = 0x3;  /* ECKD */
2147
2148         heads = basepriv->rdc_data.trk_per_cyl;
2149         begcyl = trk / heads;
2150         beghead = trk % heads;
2151         endcyl = totrk / heads;
2152         endhead = totrk % heads;
2153
2154         /* check for sequential prestage - enhance cylinder range */
2155         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2156             dedata->attributes.operation == DASD_SEQ_ACCESS) {
2157
2158                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2159                         endcyl += basepriv->attrib.nr_cyl;
2160                 else
2161                         endcyl = (basepriv->real_cyl - 1);
2162         }
2163
2164         set_ch_t(&dedata->beg_ext, begcyl, beghead);
2165         set_ch_t(&dedata->end_ext, endcyl, endhead);
2166
2167         dedata->ep_format = 0x20; /* records per track is valid */
2168         dedata->ep_rec_per_track = blk_per_trk;
2169
2170         if (rec_on_trk) {
2171                 switch (basepriv->rdc_data.dev_type) {
2172                 case 0x3390:
2173                         dn = ceil_quot(blksize + 6, 232);
2174                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
2175                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
2176                         break;
2177                 case 0x3380:
2178                         d = 7 + ceil_quot(blksize + 12, 32);
2179                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
2180                         break;
2181                 }
2182         }
2183
2184         lredata->auxiliary.length_valid = 1;
2185         lredata->auxiliary.length_scope = 1;
2186         lredata->auxiliary.imbedded_ccw_valid = 1;
2187         lredata->length = tlf;
2188         lredata->imbedded_ccw = cmd;
2189         lredata->count = count;
2190         lredata->sector = sector;
2191         set_ch_t(&lredata->seek_addr, begcyl, beghead);
2192         lredata->search_arg.cyl = lredata->seek_addr.cyl;
2193         lredata->search_arg.head = lredata->seek_addr.head;
2194         lredata->search_arg.record = rec_on_trk;
2195
2196         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
2197                      &pfxdata, sizeof(pfxdata), total_data_size);
2198
2199         return rc;
2200 }
2201
2202 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
2203                                                struct dasd_device *startdev,
2204                                                struct dasd_block *block,
2205                                                struct request *req,
2206                                                sector_t first_rec,
2207                                                sector_t last_rec,
2208                                                sector_t first_trk,
2209                                                sector_t last_trk,
2210                                                unsigned int first_offs,
2211                                                unsigned int last_offs,
2212                                                unsigned int blk_per_trk,
2213                                                unsigned int blksize)
2214 {
2215         struct dasd_eckd_private *private;
2216         struct dasd_ccw_req *cqr;
2217         struct req_iterator iter;
2218         struct bio_vec *bv;
2219         char *dst;
2220         unsigned int trkcount, ctidaw;
2221         unsigned char cmd;
2222         struct dasd_device *basedev;
2223         unsigned int tlf;
2224         struct itcw *itcw;
2225         struct tidaw *last_tidaw = NULL;
2226         int itcw_op;
2227         size_t itcw_size;
2228
2229         basedev = block->base;
2230         private = (struct dasd_eckd_private *) basedev->private;
2231         if (rq_data_dir(req) == READ) {
2232                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2233                 itcw_op = ITCW_OP_READ;
2234         } else if (rq_data_dir(req) == WRITE) {
2235                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2236                 itcw_op = ITCW_OP_WRITE;
2237         } else
2238                 return ERR_PTR(-EINVAL);
2239
2240         /* trackbased I/O needs address all memory via TIDAWs,
2241          * not just for 64 bit addresses. This allows us to map
2242          * each segment directly to one tidaw.
2243          */
2244         trkcount = last_trk - first_trk + 1;
2245         ctidaw = 0;
2246         rq_for_each_segment(bv, req, iter) {
2247                 ++ctidaw;
2248         }
2249
2250         /* Allocate the ccw request. */
2251         itcw_size = itcw_calc_size(0, ctidaw, 0);
2252         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2253                                    0, itcw_size, startdev);
2254         if (IS_ERR(cqr))
2255                 return cqr;
2256
2257         cqr->cpmode = 1;
2258         cqr->startdev = startdev;
2259         cqr->memdev = startdev;
2260         cqr->block = block;
2261         cqr->expires = 100*HZ;
2262         cqr->buildclk = get_clock();
2263         cqr->status = DASD_CQR_FILLED;
2264         cqr->retries = 10;
2265
2266         /* transfer length factor: how many bytes to read from the last track */
2267         if (first_trk == last_trk)
2268                 tlf = last_offs - first_offs + 1;
2269         else
2270                 tlf = last_offs + 1;
2271         tlf *= blksize;
2272
2273         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
2274         cqr->cpaddr = itcw_get_tcw(itcw);
2275
2276         if (prepare_itcw(itcw, first_trk, last_trk,
2277                          cmd, basedev, startdev,
2278                          first_offs + 1,
2279                          trkcount, blksize,
2280                          (last_rec - first_rec + 1) * blksize,
2281                          tlf, blk_per_trk) == -EAGAIN) {
2282                 /* Clock not in sync and XRC is enabled.
2283                  * Try again later.
2284                  */
2285                 dasd_sfree_request(cqr, startdev);
2286                 return ERR_PTR(-EAGAIN);
2287         }
2288
2289         /*
2290          * A tidaw can address 4k of memory, but must not cross page boundaries
2291          * We can let the block layer handle this by setting
2292          * blk_queue_segment_boundary to page boundaries and
2293          * blk_max_segment_size to page size when setting up the request queue.
2294          */
2295         rq_for_each_segment(bv, req, iter) {
2296                 dst = page_address(bv->bv_page) + bv->bv_offset;
2297                 last_tidaw = itcw_add_tidaw(itcw, 0x00, dst, bv->bv_len);
2298                 if (IS_ERR(last_tidaw))
2299                         return (struct dasd_ccw_req *)last_tidaw;
2300         }
2301
2302         last_tidaw->flags |= 0x80;
2303         itcw_finalize(itcw);
2304
2305         if (blk_noretry_request(req) ||
2306             block->base->features & DASD_FEATURE_FAILFAST)
2307                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2308         cqr->startdev = startdev;
2309         cqr->memdev = startdev;
2310         cqr->block = block;
2311         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
2312         cqr->lpm = private->path_data.ppm;
2313         cqr->retries = 256;
2314         cqr->buildclk = get_clock();
2315         cqr->status = DASD_CQR_FILLED;
2316         return cqr;
2317 }
2318
2319 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
2320                                                struct dasd_block *block,
2321                                                struct request *req)
2322 {
2323         int tpm, cmdrtd, cmdwtd;
2324         int use_prefix;
2325 #if defined(CONFIG_64BIT)
2326         int fcx_in_css, fcx_in_gneq, fcx_in_features;
2327 #endif
2328         struct dasd_eckd_private *private;
2329         struct dasd_device *basedev;
2330         sector_t first_rec, last_rec;
2331         sector_t first_trk, last_trk;
2332         unsigned int first_offs, last_offs;
2333         unsigned int blk_per_trk, blksize;
2334         int cdlspecial;
2335         struct dasd_ccw_req *cqr;
2336
2337         basedev = block->base;
2338         private = (struct dasd_eckd_private *) basedev->private;
2339
2340         /* Calculate number of blocks/records per track. */
2341         blksize = block->bp_block;
2342         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2343         /* Calculate record id of first and last block. */
2344         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
2345         first_offs = sector_div(first_trk, blk_per_trk);
2346         last_rec = last_trk =
2347                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
2348         last_offs = sector_div(last_trk, blk_per_trk);
2349         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
2350
2351         /* is transport mode supported? */
2352 #if defined(CONFIG_64BIT)
2353         fcx_in_css = css_general_characteristics.fcx;
2354         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
2355         fcx_in_features = private->features.feature[40] & 0x80;
2356         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
2357 #else
2358         tpm = 0;
2359 #endif
2360
2361         /* is read track data and write track data in command mode supported? */
2362         cmdrtd = private->features.feature[9] & 0x20;
2363         cmdwtd = private->features.feature[12] & 0x40;
2364         use_prefix = private->features.feature[8] & 0x01;
2365
2366         cqr = NULL;
2367         if (cdlspecial || dasd_page_cache) {
2368                 /* do nothing, just fall through to the cmd mode single case */
2369         } else if (!dasd_nofcx && tpm && (first_trk == last_trk)) {
2370                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
2371                                                     first_rec, last_rec,
2372                                                     first_trk, last_trk,
2373                                                     first_offs, last_offs,
2374                                                     blk_per_trk, blksize);
2375                 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
2376                         cqr = NULL;
2377         } else if (use_prefix &&
2378                    (((rq_data_dir(req) == READ) && cmdrtd) ||
2379                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
2380                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
2381                                                    first_rec, last_rec,
2382                                                    first_trk, last_trk,
2383                                                    first_offs, last_offs,
2384                                                    blk_per_trk, blksize);
2385                 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
2386                         cqr = NULL;
2387         }
2388         if (!cqr)
2389                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
2390                                                     first_rec, last_rec,
2391                                                     first_trk, last_trk,
2392                                                     first_offs, last_offs,
2393                                                     blk_per_trk, blksize);
2394         return cqr;
2395 }
2396
2397 static int
2398 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
2399 {
2400         struct dasd_eckd_private *private;
2401         struct ccw1 *ccw;
2402         struct req_iterator iter;
2403         struct bio_vec *bv;
2404         char *dst, *cda;
2405         unsigned int blksize, blk_per_trk, off;
2406         sector_t recid;
2407         int status;
2408
2409         if (!dasd_page_cache)
2410                 goto out;
2411         private = (struct dasd_eckd_private *) cqr->block->base->private;
2412         blksize = cqr->block->bp_block;
2413         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2414         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
2415         ccw = cqr->cpaddr;
2416         /* Skip over define extent & locate record. */
2417         ccw++;
2418         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
2419                 ccw++;
2420         rq_for_each_segment(bv, req, iter) {
2421                 dst = page_address(bv->bv_page) + bv->bv_offset;
2422                 for (off = 0; off < bv->bv_len; off += blksize) {
2423                         /* Skip locate record. */
2424                         if (private->uses_cdl && recid <= 2*blk_per_trk)
2425                                 ccw++;
2426                         if (dst) {
2427                                 if (ccw->flags & CCW_FLAG_IDA)
2428                                         cda = *((char **)((addr_t) ccw->cda));
2429                                 else
2430                                         cda = (char *)((addr_t) ccw->cda);
2431                                 if (dst != cda) {
2432                                         if (rq_data_dir(req) == READ)
2433                                                 memcpy(dst, cda, bv->bv_len);
2434                                         kmem_cache_free(dasd_page_cache,
2435                                             (void *)((addr_t)cda & PAGE_MASK));
2436                                 }
2437                                 dst = NULL;
2438                         }
2439                         ccw++;
2440                         recid++;
2441                 }
2442         }
2443 out:
2444         status = cqr->status == DASD_CQR_DONE;
2445         dasd_sfree_request(cqr, cqr->memdev);
2446         return status;
2447 }
2448
2449 /*
2450  * Modify ccw/tcw in cqr so it can be started on a base device.
2451  *
2452  * Note that this is not enough to restart the cqr!
2453  * Either reset cqr->startdev as well (summary unit check handling)
2454  * or restart via separate cqr (as in ERP handling).
2455  */
2456 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
2457 {
2458         struct ccw1 *ccw;
2459         struct PFX_eckd_data *pfxdata;
2460         struct tcw *tcw;
2461         struct tccb *tccb;
2462         struct dcw *dcw;
2463
2464         if (cqr->cpmode == 1) {
2465                 tcw = cqr->cpaddr;
2466                 tccb = tcw_get_tccb(tcw);
2467                 dcw = (struct dcw *)&tccb->tca[0];
2468                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
2469                 pfxdata->validity.verify_base = 0;
2470                 pfxdata->validity.hyper_pav = 0;
2471         } else {
2472                 ccw = cqr->cpaddr;
2473                 pfxdata = cqr->data;
2474                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
2475                         pfxdata->validity.verify_base = 0;
2476                         pfxdata->validity.hyper_pav = 0;
2477                 }
2478         }
2479 }
2480
2481 #define DASD_ECKD_CHANQ_MAX_SIZE 4
2482
2483 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
2484                                                      struct dasd_block *block,
2485                                                      struct request *req)
2486 {
2487         struct dasd_eckd_private *private;
2488         struct dasd_device *startdev;
2489         unsigned long flags;
2490         struct dasd_ccw_req *cqr;
2491
2492         startdev = dasd_alias_get_start_dev(base);
2493         if (!startdev)
2494                 startdev = base;
2495         private = (struct dasd_eckd_private *) startdev->private;
2496         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
2497                 return ERR_PTR(-EBUSY);
2498
2499         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
2500         private->count++;
2501         cqr = dasd_eckd_build_cp(startdev, block, req);
2502         if (IS_ERR(cqr))
2503                 private->count--;
2504         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
2505         return cqr;
2506 }
2507
2508 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
2509                                    struct request *req)
2510 {
2511         struct dasd_eckd_private *private;
2512         unsigned long flags;
2513
2514         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
2515         private = (struct dasd_eckd_private *) cqr->memdev->private;
2516         private->count--;
2517         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
2518         return dasd_eckd_free_cp(cqr, req);
2519 }
2520
2521 static int
2522 dasd_eckd_fill_info(struct dasd_device * device,
2523                     struct dasd_information2_t * info)
2524 {
2525         struct dasd_eckd_private *private;
2526
2527         private = (struct dasd_eckd_private *) device->private;
2528         info->label_block = 2;
2529         info->FBA_layout = private->uses_cdl ? 0 : 1;
2530         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
2531         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
2532         memcpy(info->characteristics, &private->rdc_data,
2533                sizeof(struct dasd_eckd_characteristics));
2534         info->confdata_size = min((unsigned long)private->conf_len,
2535                                   sizeof(info->configuration_data));
2536         memcpy(info->configuration_data, private->conf_data,
2537                info->confdata_size);
2538         return 0;
2539 }
2540
2541 /*
2542  * SECTION: ioctl functions for eckd devices.
2543  */
2544
2545 /*
2546  * Release device ioctl.
2547  * Buils a channel programm to releases a prior reserved
2548  * (see dasd_eckd_reserve) device.
2549  */
2550 static int
2551 dasd_eckd_release(struct dasd_device *device)
2552 {
2553         struct dasd_ccw_req *cqr;
2554         int rc;
2555         struct ccw1 *ccw;
2556
2557         if (!capable(CAP_SYS_ADMIN))
2558                 return -EACCES;
2559
2560         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2561                                    1, 32, device);
2562         if (IS_ERR(cqr)) {
2563                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2564                             "Could not allocate initialization request");
2565                 return PTR_ERR(cqr);
2566         }
2567         ccw = cqr->cpaddr;
2568         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
2569         ccw->flags |= CCW_FLAG_SLI;
2570         ccw->count = 32;
2571         ccw->cda = (__u32)(addr_t) cqr->data;
2572         cqr->startdev = device;
2573         cqr->memdev = device;
2574         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2575         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2576         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2577         cqr->expires = 2 * HZ;
2578         cqr->buildclk = get_clock();
2579         cqr->status = DASD_CQR_FILLED;
2580
2581         rc = dasd_sleep_on_immediatly(cqr);
2582
2583         dasd_sfree_request(cqr, cqr->memdev);
2584         return rc;
2585 }
2586
2587 /*
2588  * Reserve device ioctl.
2589  * Options are set to 'synchronous wait for interrupt' and
2590  * 'timeout the request'. This leads to a terminate IO if
2591  * the interrupt is outstanding for a certain time.
2592  */
2593 static int
2594 dasd_eckd_reserve(struct dasd_device *device)
2595 {
2596         struct dasd_ccw_req *cqr;
2597         int rc;
2598         struct ccw1 *ccw;
2599
2600         if (!capable(CAP_SYS_ADMIN))
2601                 return -EACCES;
2602
2603         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2604                                    1, 32, device);
2605         if (IS_ERR(cqr)) {
2606                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2607                             "Could not allocate initialization request");
2608                 return PTR_ERR(cqr);
2609         }
2610         ccw = cqr->cpaddr;
2611         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
2612         ccw->flags |= CCW_FLAG_SLI;
2613         ccw->count = 32;
2614         ccw->cda = (__u32)(addr_t) cqr->data;
2615         cqr->startdev = device;
2616         cqr->memdev = device;
2617         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2618         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2619         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2620         cqr->expires = 2 * HZ;
2621         cqr->buildclk = get_clock();
2622         cqr->status = DASD_CQR_FILLED;
2623
2624         rc = dasd_sleep_on_immediatly(cqr);
2625
2626         dasd_sfree_request(cqr, cqr->memdev);
2627         return rc;
2628 }
2629
2630 /*
2631  * Steal lock ioctl - unconditional reserve device.
2632  * Buils a channel programm to break a device's reservation.
2633  * (unconditional reserve)
2634  */
2635 static int
2636 dasd_eckd_steal_lock(struct dasd_device *device)
2637 {
2638         struct dasd_ccw_req *cqr;
2639         int rc;
2640         struct ccw1 *ccw;
2641
2642         if (!capable(CAP_SYS_ADMIN))
2643                 return -EACCES;
2644
2645         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2646                                    1, 32, device);
2647         if (IS_ERR(cqr)) {
2648                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2649                             "Could not allocate initialization request");
2650                 return PTR_ERR(cqr);
2651         }
2652         ccw = cqr->cpaddr;
2653         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
2654         ccw->flags |= CCW_FLAG_SLI;
2655         ccw->count = 32;
2656         ccw->cda = (__u32)(addr_t) cqr->data;
2657         cqr->startdev = device;
2658         cqr->memdev = device;
2659         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2660         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2661         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2662         cqr->expires = 2 * HZ;
2663         cqr->buildclk = get_clock();
2664         cqr->status = DASD_CQR_FILLED;
2665
2666         rc = dasd_sleep_on_immediatly(cqr);
2667
2668         dasd_sfree_request(cqr, cqr->memdev);
2669         return rc;
2670 }
2671
2672 /*
2673  * Read performance statistics
2674  */
2675 static int
2676 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
2677 {
2678         struct dasd_psf_prssd_data *prssdp;
2679         struct dasd_rssd_perf_stats_t *stats;
2680         struct dasd_ccw_req *cqr;
2681         struct ccw1 *ccw;
2682         int rc;
2683
2684         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2685                                    1 /* PSF */  + 1 /* RSSD */ ,
2686                                    (sizeof(struct dasd_psf_prssd_data) +
2687                                     sizeof(struct dasd_rssd_perf_stats_t)),
2688                                    device);
2689         if (IS_ERR(cqr)) {
2690                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2691                             "Could not allocate initialization request");
2692                 return PTR_ERR(cqr);
2693         }
2694         cqr->startdev = device;
2695         cqr->memdev = device;
2696         cqr->retries = 0;
2697         cqr->expires = 10 * HZ;
2698
2699         /* Prepare for Read Subsystem Data */
2700         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
2701         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
2702         prssdp->order = PSF_ORDER_PRSSD;
2703         prssdp->suborder = 0x01;        /* Performance Statistics */
2704         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
2705
2706         ccw = cqr->cpaddr;
2707         ccw->cmd_code = DASD_ECKD_CCW_PSF;
2708         ccw->count = sizeof(struct dasd_psf_prssd_data);
2709         ccw->flags |= CCW_FLAG_CC;
2710         ccw->cda = (__u32)(addr_t) prssdp;
2711
2712         /* Read Subsystem Data - Performance Statistics */
2713         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
2714         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
2715
2716         ccw++;
2717         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
2718         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
2719         ccw->cda = (__u32)(addr_t) stats;
2720
2721         cqr->buildclk = get_clock();
2722         cqr->status = DASD_CQR_FILLED;
2723         rc = dasd_sleep_on(cqr);
2724         if (rc == 0) {
2725                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
2726                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
2727                 if (copy_to_user(argp, stats,
2728                                  sizeof(struct dasd_rssd_perf_stats_t)))
2729                         rc = -EFAULT;
2730         }
2731         dasd_sfree_request(cqr, cqr->memdev);
2732         return rc;
2733 }
2734
2735 /*
2736  * Get attributes (cache operations)
2737  * Returnes the cache attributes used in Define Extend (DE).
2738  */
2739 static int
2740 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
2741 {
2742         struct dasd_eckd_private *private =
2743                 (struct dasd_eckd_private *)device->private;
2744         struct attrib_data_t attrib = private->attrib;
2745         int rc;
2746
2747         if (!capable(CAP_SYS_ADMIN))
2748                 return -EACCES;
2749         if (!argp)
2750                 return -EINVAL;
2751
2752         rc = 0;
2753         if (copy_to_user(argp, (long *) &attrib,
2754                          sizeof(struct attrib_data_t)))
2755                 rc = -EFAULT;
2756
2757         return rc;
2758 }
2759
2760 /*
2761  * Set attributes (cache operations)
2762  * Stores the attributes for cache operation to be used in Define Extend (DE).
2763  */
2764 static int
2765 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
2766 {
2767         struct dasd_eckd_private *private =
2768                 (struct dasd_eckd_private *)device->private;
2769         struct attrib_data_t attrib;
2770
2771         if (!capable(CAP_SYS_ADMIN))
2772                 return -EACCES;
2773         if (!argp)
2774                 return -EINVAL;
2775
2776         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
2777                 return -EFAULT;
2778         private->attrib = attrib;
2779
2780         dev_info(&device->cdev->dev,
2781                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
2782                  private->attrib.operation, private->attrib.nr_cyl);
2783         return 0;
2784 }
2785
2786 /*
2787  * Issue syscall I/O to EMC Symmetrix array.
2788  * CCWs are PSF and RSSD
2789  */
2790 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
2791 {
2792         struct dasd_symmio_parms usrparm;
2793         char *psf_data, *rssd_result;
2794         struct dasd_ccw_req *cqr;
2795         struct ccw1 *ccw;
2796         int rc;
2797
2798         /* Copy parms from caller */
2799         rc = -EFAULT;
2800         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
2801                 goto out;
2802 #ifndef CONFIG_64BIT
2803         /* Make sure pointers are sane even on 31 bit. */
2804         if ((usrparm.psf_data >> 32) != 0 || (usrparm.rssd_result >> 32) != 0) {
2805                 rc = -EINVAL;
2806                 goto out;
2807         }
2808 #endif
2809         /* alloc I/O data area */
2810         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
2811         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
2812         if (!psf_data || !rssd_result) {
2813                 rc = -ENOMEM;
2814                 goto out_free;
2815         }
2816
2817         /* get syscall header from user space */
2818         rc = -EFAULT;
2819         if (copy_from_user(psf_data,
2820                            (void __user *)(unsigned long) usrparm.psf_data,
2821                            usrparm.psf_data_len))
2822                 goto out_free;
2823
2824         /* sanity check on syscall header */
2825         if (psf_data[0] != 0x17 && psf_data[1] != 0xce) {
2826                 rc = -EINVAL;
2827                 goto out_free;
2828         }
2829
2830         /* setup CCWs for PSF + RSSD */
2831         cqr = dasd_smalloc_request("ECKD", 2 , 0, device);
2832         if (IS_ERR(cqr)) {
2833                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2834                         "Could not allocate initialization request");
2835                 rc = PTR_ERR(cqr);
2836                 goto out_free;
2837         }
2838
2839         cqr->startdev = device;
2840         cqr->memdev = device;
2841         cqr->retries = 3;
2842         cqr->expires = 10 * HZ;
2843         cqr->buildclk = get_clock();
2844         cqr->status = DASD_CQR_FILLED;
2845
2846         /* Build the ccws */
2847         ccw = cqr->cpaddr;
2848
2849         /* PSF ccw */
2850         ccw->cmd_code = DASD_ECKD_CCW_PSF;
2851         ccw->count = usrparm.psf_data_len;
2852         ccw->flags |= CCW_FLAG_CC;
2853         ccw->cda = (__u32)(addr_t) psf_data;
2854
2855         ccw++;
2856
2857         /* RSSD ccw  */
2858         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
2859         ccw->count = usrparm.rssd_result_len;
2860         ccw->flags = CCW_FLAG_SLI ;
2861         ccw->cda = (__u32)(addr_t) rssd_result;
2862
2863         rc = dasd_sleep_on(cqr);
2864         if (rc)
2865                 goto out_sfree;
2866
2867         rc = -EFAULT;
2868         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
2869                            rssd_result, usrparm.rssd_result_len))
2870                 goto out_sfree;
2871         rc = 0;
2872
2873 out_sfree:
2874         dasd_sfree_request(cqr, cqr->memdev);
2875 out_free:
2876         kfree(rssd_result);
2877         kfree(psf_data);
2878 out:
2879         DBF_DEV_EVENT(DBF_WARNING, device, "Symmetrix ioctl: rc=%d", rc);
2880         return rc;
2881 }
2882
2883 static int
2884 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
2885 {
2886         struct dasd_device *device = block->base;
2887
2888         switch (cmd) {
2889         case BIODASDGATTR:
2890                 return dasd_eckd_get_attrib(device, argp);
2891         case BIODASDSATTR:
2892                 return dasd_eckd_set_attrib(device, argp);
2893         case BIODASDPSRD:
2894                 return dasd_eckd_performance(device, argp);
2895         case BIODASDRLSE:
2896                 return dasd_eckd_release(device);
2897         case BIODASDRSRV:
2898                 return dasd_eckd_reserve(device);
2899         case BIODASDSLCK:
2900                 return dasd_eckd_steal_lock(device);
2901         case BIODASDSYMMIO:
2902                 return dasd_symm_io(device, argp);
2903         default:
2904                 return -ENOIOCTLCMD;
2905         }
2906 }
2907
2908 /*
2909  * Dump the range of CCWs into 'page' buffer
2910  * and return number of printed chars.
2911  */
2912 static int
2913 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
2914 {
2915         int len, count;
2916         char *datap;
2917
2918         len = 0;
2919         while (from <= to) {
2920                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2921                                " CCW %p: %08X %08X DAT:",
2922                                from, ((int *) from)[0], ((int *) from)[1]);
2923
2924                 /* get pointer to data (consider IDALs) */
2925                 if (from->flags & CCW_FLAG_IDA)
2926                         datap = (char *) *((addr_t *) (addr_t) from->cda);
2927                 else
2928                         datap = (char *) ((addr_t) from->cda);
2929
2930                 /* dump data (max 32 bytes) */
2931                 for (count = 0; count < from->count && count < 32; count++) {
2932                         if (count % 8 == 0) len += sprintf(page + len, " ");
2933                         if (count % 4 == 0) len += sprintf(page + len, " ");
2934                         len += sprintf(page + len, "%02x", datap[count]);
2935                 }
2936                 len += sprintf(page + len, "\n");
2937                 from++;
2938         }
2939         return len;
2940 }
2941
2942 static void
2943 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
2944                          char *reason)
2945 {
2946         u64 *sense;
2947
2948         sense = (u64 *) dasd_get_sense(irb);
2949         if (sense) {
2950                 DBF_DEV_EVENT(DBF_EMERG, device,
2951                               "%s: %s %02x%02x%02x %016llx %016llx %016llx "
2952                               "%016llx", reason,
2953                               scsw_is_tm(&irb->scsw) ? "t" : "c",
2954                               scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw),
2955                               scsw_dstat(&irb->scsw), sense[0], sense[1],
2956                               sense[2], sense[3]);
2957         } else {
2958                 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
2959                               "SORRY - NO VALID SENSE AVAILABLE\n");
2960         }
2961 }
2962
2963 /*
2964  * Print sense data and related channel program.
2965  * Parts are printed because printk buffer is only 1024 bytes.
2966  */
2967 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
2968                                  struct dasd_ccw_req *req, struct irb *irb)
2969 {
2970         char *page;
2971         struct ccw1 *first, *last, *fail, *from, *to;
2972         int len, sl, sct;
2973
2974         page = (char *) get_zeroed_page(GFP_ATOMIC);
2975         if (page == NULL) {
2976                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2977                               "No memory to dump sense data\n");
2978                 return;
2979         }
2980         /* dump the sense data */
2981         len = sprintf(page,  KERN_ERR PRINTK_HEADER
2982                       " I/O status report for device %s:\n",
2983                       dev_name(&device->cdev->dev));
2984         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2985                        " in req: %p CS: 0x%02X DS: 0x%02X CC: 0x%02X RC: %d\n",
2986                        req, scsw_cstat(&irb->scsw), scsw_dstat(&irb->scsw),
2987                        scsw_cc(&irb->scsw), req->intrc);
2988         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2989                        " device %s: Failing CCW: %p\n",
2990                        dev_name(&device->cdev->dev),
2991                        (void *) (addr_t) irb->scsw.cmd.cpa);
2992         if (irb->esw.esw0.erw.cons) {
2993                 for (sl = 0; sl < 4; sl++) {
2994                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2995                                        " Sense(hex) %2d-%2d:",
2996                                        (8 * sl), ((8 * sl) + 7));
2997
2998                         for (sct = 0; sct < 8; sct++) {
2999                                 len += sprintf(page + len, " %02x",
3000                                                irb->ecw[8 * sl + sct]);
3001                         }
3002                         len += sprintf(page + len, "\n");
3003                 }
3004
3005                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
3006                         /* 24 Byte Sense Data */
3007                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3008                                 " 24 Byte: %x MSG %x, "
3009                                 "%s MSGb to SYSOP\n",
3010                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
3011                                 irb->ecw[1] & 0x10 ? "" : "no");
3012                 } else {
3013                         /* 32 Byte Sense Data */
3014                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3015                                 " 32 Byte: Format: %x "
3016                                 "Exception class %x\n",
3017                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
3018                 }
3019         } else {
3020                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3021                         " SORRY - NO VALID SENSE AVAILABLE\n");
3022         }
3023         printk("%s", page);
3024
3025         if (req) {
3026                 /* req == NULL for unsolicited interrupts */
3027                 /* dump the Channel Program (max 140 Bytes per line) */
3028                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
3029                 first = req->cpaddr;
3030                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
3031                 to = min(first + 6, last);
3032                 len = sprintf(page,  KERN_ERR PRINTK_HEADER
3033                               " Related CP in req: %p\n", req);
3034                 dasd_eckd_dump_ccw_range(first, to, page + len);
3035                 printk("%s", page);
3036
3037                 /* print failing CCW area (maximum 4) */
3038                 /* scsw->cda is either valid or zero  */
3039                 len = 0;
3040                 from = ++to;
3041                 fail = (struct ccw1 *)(addr_t)
3042                                 irb->scsw.cmd.cpa; /* failing CCW */
3043                 if (from <  fail - 2) {
3044                         from = fail - 2;     /* there is a gap - print header */
3045                         len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
3046                 }
3047                 to = min(fail + 1, last);
3048                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
3049
3050                 /* print last CCWs (maximum 2) */
3051                 from = max(from, ++to);
3052                 if (from < last - 1) {
3053                         from = last - 1;     /* there is a gap - print header */
3054                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
3055                 }
3056                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
3057                 if (len > 0)
3058                         printk("%s", page);
3059         }
3060         free_page((unsigned long) page);
3061 }
3062
3063
3064 /*
3065  * Print sense data from a tcw.
3066  */
3067 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
3068                                  struct dasd_ccw_req *req, struct irb *irb)
3069 {
3070         char *page;
3071         int len, sl, sct, residual;
3072
3073         struct tsb *tsb;
3074         u8 *sense;
3075
3076
3077         page = (char *) get_zeroed_page(GFP_ATOMIC);
3078         if (page == NULL) {
3079                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
3080                             "No memory to dump sense data");
3081                 return;
3082         }
3083         /* dump the sense data */
3084         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3085                       " I/O status report for device %s:\n",
3086                       dev_name(&device->cdev->dev));
3087         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3088                        " in req: %p CS: 0x%02X DS: 0x%02X CC: 0x%02X RC: %d "
3089                        "fcxs: 0x%02X schxs: 0x%02X\n", req,
3090                        scsw_cstat(&irb->scsw), scsw_dstat(&irb->scsw),
3091                        scsw_cc(&irb->scsw), req->intrc,
3092                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs);
3093         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3094                        " device %s: Failing TCW: %p\n",
3095                        dev_name(&device->cdev->dev),
3096                        (void *) (addr_t) irb->scsw.tm.tcw);
3097
3098         tsb = NULL;
3099         sense = NULL;
3100         if (irb->scsw.tm.tcw)
3101                 tsb = tcw_get_tsb(
3102                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
3103
3104         if (tsb && (irb->scsw.tm.fcxs == 0x01)) {
3105                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3106                                " tsb->length %d\n", tsb->length);
3107                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3108                                " tsb->flags %x\n", tsb->flags);
3109                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3110                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
3111                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3112                                " tsb->count %d\n", tsb->count);
3113                 residual = tsb->count - 28;
3114                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3115                                " residual %d\n", residual);
3116
3117                 switch (tsb->flags & 0x07) {
3118                 case 1: /* tsa_iostat */
3119                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3120                                " tsb->tsa.iostat.dev_time %d\n",
3121                                        tsb->tsa.iostat.dev_time);
3122                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3123                                " tsb->tsa.iostat.def_time %d\n",
3124                                        tsb->tsa.iostat.def_time);
3125                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3126                                " tsb->tsa.iostat.queue_time %d\n",
3127                                        tsb->tsa.iostat.queue_time);
3128                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3129                                " tsb->tsa.iostat.dev_busy_time %d\n",
3130                                        tsb->tsa.iostat.dev_busy_time);
3131                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3132                                " tsb->tsa.iostat.dev_act_time %d\n",
3133                                        tsb->tsa.iostat.dev_act_time);
3134                         sense = tsb->tsa.iostat.sense;
3135                         break;
3136                 case 2: /* ts_ddpc */
3137                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3138                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
3139                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3140                                " tsb->tsa.ddpc.rcq:  ");
3141                         for (sl = 0; sl < 16; sl++) {
3142                                 for (sct = 0; sct < 8; sct++) {
3143                                         len += sprintf(page + len, " %02x",
3144                                                        tsb->tsa.ddpc.rcq[sl]);
3145                                 }
3146                                 len += sprintf(page + len, "\n");
3147                         }
3148                         sense = tsb->tsa.ddpc.sense;
3149                         break;
3150                 case 3: /* tsa_intrg */
3151                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3152                                       " tsb->tsa.intrg.: not supportet yet \n");
3153                         break;
3154                 }
3155
3156                 if (sense) {
3157                         for (sl = 0; sl < 4; sl++) {
3158                                 len += sprintf(page + len,
3159                                                KERN_ERR PRINTK_HEADER
3160                                                " Sense(hex) %2d-%2d:",
3161                                                (8 * sl), ((8 * sl) + 7));
3162                                 for (sct = 0; sct < 8; sct++) {
3163                                         len += sprintf(page + len, " %02x",
3164                                                        sense[8 * sl + sct]);
3165                                 }
3166                                 len += sprintf(page + len, "\n");
3167                         }
3168
3169                         if (sense[27] & DASD_SENSE_BIT_0) {
3170                                 /* 24 Byte Sense Data */
3171                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3172                                         " 24 Byte: %x MSG %x, "
3173                                         "%s MSGb to SYSOP\n",
3174                                         sense[7] >> 4, sense[7] & 0x0f,
3175                                         sense[1] & 0x10 ? "" : "no");
3176                         } else {
3177                                 /* 32 Byte Sense Data */
3178                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3179                                         " 32 Byte: Format: %x "
3180                                         "Exception class %x\n",
3181                                         sense[6] & 0x0f, sense[22] >> 4);
3182                         }
3183                 } else {
3184                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3185                                 " SORRY - NO VALID SENSE AVAILABLE\n");
3186                 }
3187         } else {
3188                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3189                         " SORRY - NO TSB DATA AVAILABLE\n");
3190         }
3191         printk("%s", page);
3192         free_page((unsigned long) page);
3193 }
3194
3195 static void dasd_eckd_dump_sense(struct dasd_device *device,
3196                                  struct dasd_ccw_req *req, struct irb *irb)
3197 {
3198         if (req && scsw_is_tm(&req->irb.scsw))
3199                 dasd_eckd_dump_sense_tcw(device, req, irb);
3200         else
3201                 dasd_eckd_dump_sense_ccw(device, req, irb);
3202 }
3203
3204 int dasd_eckd_pm_freeze(struct dasd_device *device)
3205 {
3206         /*
3207          * the device should be disconnected from our LCU structure
3208          * on restore we will reconnect it and reread LCU specific
3209          * information like PAV support that might have changed
3210          */
3211         dasd_alias_remove_device(device);
3212         dasd_alias_disconnect_device_from_lcu(device);
3213
3214         return 0;
3215 }
3216
3217 int dasd_eckd_restore_device(struct dasd_device *device)
3218 {
3219         struct dasd_eckd_private *private;
3220         int is_known, rc;
3221         struct dasd_uid temp_uid;
3222
3223         private = (struct dasd_eckd_private *) device->private;
3224
3225         /* Read Configuration Data */
3226         rc = dasd_eckd_read_conf(device);
3227         if (rc)
3228                 goto out_err;
3229
3230         /* Generate device unique id and register in devmap */
3231         rc = dasd_eckd_generate_uid(device, &private->uid);
3232         dasd_get_uid(device->cdev, &temp_uid);
3233         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
3234                 dev_err(&device->cdev->dev, "The UID of the DASD has changed\n");
3235         if (rc)
3236                 goto out_err;
3237         dasd_set_uid(device->cdev, &private->uid);
3238
3239         /* register lcu with alias handling, enable PAV if this is a new lcu */
3240         is_known = dasd_alias_make_device_known_to_lcu(device);
3241         if (is_known < 0)
3242                 return is_known;
3243         if (!is_known) {
3244                 /* new lcu found */
3245                 rc = dasd_eckd_validate_server(device); /* will switch pav on */
3246                 if (rc)
3247                         goto out_err;
3248         }
3249
3250         /* Read Feature Codes */
3251         rc = dasd_eckd_read_features(device);
3252         if (rc)
3253                 goto out_err;
3254
3255         /* Read Device Characteristics */
3256         memset(&private->rdc_data, 0, sizeof(private->rdc_data));
3257         rc = dasd_generic_read_dev_chars(device, "ECKD",
3258                                          &private->rdc_data, 64);
3259         if (rc) {
3260                 DBF_EVENT(DBF_WARNING,
3261                           "Read device characteristics failed, rc=%d for "
3262                           "device: %s", rc, dev_name(&device->cdev->dev));
3263                 goto out_err;
3264         }
3265
3266         /* add device to alias management */
3267         dasd_alias_add_device(device);
3268
3269         return 0;
3270
3271 out_err:
3272         return -1;
3273 }
3274
3275 static struct ccw_driver dasd_eckd_driver = {
3276         .name        = "dasd-eckd",
3277         .owner       = THIS_MODULE,
3278         .ids         = dasd_eckd_ids,
3279         .probe       = dasd_eckd_probe,
3280         .remove      = dasd_generic_remove,
3281         .set_offline = dasd_generic_set_offline,
3282         .set_online  = dasd_eckd_set_online,
3283         .notify      = dasd_generic_notify,
3284         .freeze      = dasd_generic_pm_freeze,
3285         .thaw        = dasd_generic_restore_device,
3286         .restore     = dasd_generic_restore_device,
3287 };
3288
3289 /*
3290  * max_blocks is dependent on the amount of storage that is available
3291  * in the static io buffer for each device. Currently each device has
3292  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
3293  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
3294  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
3295  * addition we have one define extent ccw + 16 bytes of data and one
3296  * locate record ccw + 16 bytes of data. That makes:
3297  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
3298  * We want to fit two into the available memory so that we can immediately
3299  * start the next request if one finishes off. That makes 249.5 blocks
3300  * for one request. Give a little safety and the result is 240.
3301  */
3302 static struct dasd_discipline dasd_eckd_discipline = {
3303         .owner = THIS_MODULE,
3304         .name = "ECKD",
3305         .ebcname = "ECKD",
3306         .max_blocks = 240,
3307         .check_device = dasd_eckd_check_characteristics,
3308         .uncheck_device = dasd_eckd_uncheck_device,
3309         .do_analysis = dasd_eckd_do_analysis,
3310         .ready_to_online = dasd_eckd_ready_to_online,
3311         .online_to_ready = dasd_eckd_online_to_ready,
3312         .fill_geometry = dasd_eckd_fill_geometry,
3313         .start_IO = dasd_start_IO,
3314         .term_IO = dasd_term_IO,
3315         .handle_terminated_request = dasd_eckd_handle_terminated_request,
3316         .format_device = dasd_eckd_format_device,
3317         .erp_action = dasd_eckd_erp_action,
3318         .erp_postaction = dasd_eckd_erp_postaction,
3319         .handle_unsolicited_interrupt = dasd_eckd_handle_unsolicited_interrupt,
3320         .build_cp = dasd_eckd_build_alias_cp,
3321         .free_cp = dasd_eckd_free_alias_cp,
3322         .dump_sense = dasd_eckd_dump_sense,
3323         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
3324         .fill_info = dasd_eckd_fill_info,
3325         .ioctl = dasd_eckd_ioctl,
3326         .freeze = dasd_eckd_pm_freeze,
3327         .restore = dasd_eckd_restore_device,
3328 };
3329
3330 static int __init
3331 dasd_eckd_init(void)
3332 {
3333         int ret;
3334
3335         ASCEBC(dasd_eckd_discipline.ebcname, 4);
3336         ret = ccw_driver_register(&dasd_eckd_driver);
3337         if (!ret)
3338                 wait_for_device_probe();
3339
3340         return ret;
3341 }
3342
3343 static void __exit
3344 dasd_eckd_cleanup(void)
3345 {
3346         ccw_driver_unregister(&dasd_eckd_driver);
3347 }
3348
3349 module_init(dasd_eckd_init);
3350 module_exit(dasd_eckd_cleanup);