drivers/s390/block/dasd_eckd.c

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_eckd.c
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5  *                  Carsten Otte <Cotte@de.ibm.com>
   6  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  * Bugreports.to..: <Linux390@de.ibm.com>
   8  * Copyright IBM Corp. 1999, 2009
   9  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
  10  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
  11  */
  12
  13 #define KMSG_COMPONENT "dasd-eckd"
  14
  15 #include <linux/stddef.h>
  16 #include <linux/kernel.h>
  17 #include <linux/slab.h>
  18 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  19 #include <linux/bio.h>
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22
  23 #include <asm/debug.h>
  24 #include <asm/idals.h>
  25 #include <asm/ebcdic.h>
  26 #include <asm/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(DASD_ECKD_MAGIC, 1 /* RCD */, ciw->count,
 734                                    device);
 735
 736         if (IS_ERR(cqr)) {
 737                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 738                               "Could not allocate RCD request");
 739                 return cqr;
 740         }
 741
 742         ccw = cqr->cpaddr;
 743         ccw->cmd_code = ciw->cmd;
 744         ccw->cda = (__u32)(addr_t)rcd_buffer;
 745         ccw->count = ciw->count;
 746
 747         cqr->startdev = device;
 748         cqr->memdev = device;
 749         cqr->block = NULL;
 750         cqr->expires = 10*HZ;
 751         cqr->lpm = lpm;
 752         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 753         cqr->retries = 2;
 754         cqr->buildclk = get_clock();
 755         cqr->status = DASD_CQR_FILLED;
 756         return cqr;
 757 }
 758
 759 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 760                                    void **rcd_buffer,
 761                                    int *rcd_buffer_size, __u8 lpm)
 762 {
 763         struct ciw *ciw;
 764         char *rcd_buf = NULL;
 765         int ret;
 766         struct dasd_ccw_req *cqr;
 767
 768         /*
 769          * scan for RCD command in extended SenseID data
 770          */
 771         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 772         if (!ciw || ciw->cmd == 0) {
 773                 ret = -EOPNOTSUPP;
 774                 goto out_error;
 775         }
 776         rcd_buf = kzalloc(ciw->count, GFP_KERNEL | GFP_DMA);
 777         if (!rcd_buf) {
 778                 ret = -ENOMEM;
 779                 goto out_error;
 780         }
 781
 782         /*
 783          * buffer has to start with EBCDIC "V1.0" to show
 784          * support for virtual device SNEQ
 785          */
 786         rcd_buf[0] = 0xE5;
 787         rcd_buf[1] = 0xF1;
 788         rcd_buf[2] = 0x4B;
 789         rcd_buf[3] = 0xF0;
 790         cqr = dasd_eckd_build_rcd_lpm(device, rcd_buf, ciw, lpm);
 791         if (IS_ERR(cqr)) {
 792                 ret =  PTR_ERR(cqr);
 793                 goto out_error;
 794         }
 795         ret = dasd_sleep_on(cqr);
 796         /*
 797          * on success we update the user input parms
 798          */
 799         dasd_sfree_request(cqr, cqr->memdev);
 800         if (ret)
 801                 goto out_error;
 802
 803         *rcd_buffer_size = ciw->count;
 804         *rcd_buffer = rcd_buf;
 805         return 0;
 806 out_error:
 807         kfree(rcd_buf);
 808         *rcd_buffer = NULL;
 809         *rcd_buffer_size = 0;
 810         return ret;
 811 }
 812
 813 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
 814 {
 815
 816         struct dasd_sneq *sneq;
 817         int i, count;
 818
 819         private->ned = NULL;
 820         private->sneq = NULL;
 821         private->vdsneq = NULL;
 822         private->gneq = NULL;
 823         count = private->conf_len / sizeof(struct dasd_sneq);
 824         sneq = (struct dasd_sneq *)private->conf_data;
 825         for (i = 0; i < count; ++i) {
 826                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 827                         private->sneq = sneq;
 828                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 829                         private->vdsneq = (struct vd_sneq *)sneq;
 830                 else if (sneq->flags.identifier == 2)
 831                         private->gneq = (struct dasd_gneq *)sneq;
 832                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 833                         private->ned = (struct dasd_ned *)sneq;
 834                 sneq++;
 835         }
 836         if (!private->ned || !private->gneq) {
 837                 private->ned = NULL;
 838                 private->sneq = NULL;
 839                 private->vdsneq = NULL;
 840                 private->gneq = NULL;
 841                 return -EINVAL;
 842         }
 843         return 0;
 844
 845 };
 846
 847 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
 848 {
 849         struct dasd_gneq *gneq;
 850         int i, count, found;
 851
 852         count = conf_len / sizeof(*gneq);
 853         gneq = (struct dasd_gneq *)conf_data;
 854         found = 0;
 855         for (i = 0; i < count; ++i) {
 856                 if (gneq->flags.identifier == 2) {
 857                         found = 1;
 858                         break;
 859                 }
 860                 gneq++;
 861         }
 862         if (found)
 863                 return ((char *)gneq)[18] & 0x07;
 864         else
 865                 return 0;
 866 }
 867
 868 static int dasd_eckd_read_conf(struct dasd_device *device)
 869 {
 870         void *conf_data;
 871         int conf_len, conf_data_saved;
 872         int rc;
 873         __u8 lpm;
 874         struct dasd_eckd_private *private;
 875         struct dasd_eckd_path *path_data;
 876
 877         private = (struct dasd_eckd_private *) device->private;
 878         path_data = (struct dasd_eckd_path *) &private->path_data;
 879         path_data->opm = ccw_device_get_path_mask(device->cdev);
 880         lpm = 0x80;
 881         conf_data_saved = 0;
 882         /* get configuration data per operational path */
 883         for (lpm = 0x80; lpm; lpm>>= 1) {
 884                 if (lpm & path_data->opm){
 885                         rc = dasd_eckd_read_conf_lpm(device, &conf_data,
 886                                                      &conf_len, lpm);
 887                         if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
 888                                 DBF_EVENT(DBF_WARNING,
 889                                           "Read configuration data returned "
 890                                           "error %d for device: %s", rc,
 891                                           dev_name(&device->cdev->dev));
 892                                 return rc;
 893                         }
 894                         if (conf_data == NULL) {
 895                                 DBF_EVENT(DBF_WARNING, "No configuration "
 896                                           "data retrieved for device: %s",
 897                                           dev_name(&device->cdev->dev));
 898                                 continue;       /* no error */
 899                         }
 900                         /* save first valid configuration data */
 901                         if (!conf_data_saved) {
 902                                 kfree(private->conf_data);
 903                                 private->conf_data = conf_data;
 904                                 private->conf_len = conf_len;
 905                                 if (dasd_eckd_identify_conf_parts(private)) {
 906                                         private->conf_data = NULL;
 907                                         private->conf_len = 0;
 908                                         kfree(conf_data);
 909                                         continue;
 910                                 }
 911                                 conf_data_saved++;
 912                         }
 913                         switch (dasd_eckd_path_access(conf_data, conf_len)) {
 914                         case 0x02:
 915                                 path_data->npm |= lpm;
 916                                 break;
 917                         case 0x03:
 918                                 path_data->ppm |= lpm;
 919                                 break;
 920                         }
 921                         if (conf_data != private->conf_data)
 922                                 kfree(conf_data);
 923                 }
 924         }
 925         return 0;
 926 }
 927
 928 static int dasd_eckd_read_features(struct dasd_device *device)
 929 {
 930         struct dasd_psf_prssd_data *prssdp;
 931         struct dasd_rssd_features *features;
 932         struct dasd_ccw_req *cqr;
 933         struct ccw1 *ccw;
 934         int rc;
 935         struct dasd_eckd_private *private;
 936
 937         private = (struct dasd_eckd_private *) device->private;
 938         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 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(DASD_ECKD_MAGIC, 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, DASD_ECKD_MAGIC,
1153                                          &private->rdc_data, 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_MAGIC, cplength, datasize, device);
1221         if (IS_ERR(cqr))
1222                 return cqr;
1223         ccw = cqr->cpaddr;
1224         /* Define extent for the first 3 tracks. */
1225         define_extent(ccw++, cqr->data, 0, 2,
1226                       DASD_ECKD_CCW_READ_COUNT, device);
1227         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1228         /* Locate record for the first 4 records on track 0. */
1229         ccw[-1].flags |= CCW_FLAG_CC;
1230         locate_record(ccw++, LO_data++, 0, 0, 4,
1231                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1232
1233         count_data = private->count_area;
1234         for (i = 0; i < 4; i++) {
1235                 ccw[-1].flags |= CCW_FLAG_CC;
1236                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1237                 ccw->flags = 0;
1238                 ccw->count = 8;
1239                 ccw->cda = (__u32)(addr_t) count_data;
1240                 ccw++;
1241                 count_data++;
1242         }
1243
1244         /* Locate record for the first record on track 2. */
1245         ccw[-1].flags |= CCW_FLAG_CC;
1246         locate_record(ccw++, LO_data++, 2, 0, 1,
1247                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1248         /* Read count ccw. */
1249         ccw[-1].flags |= CCW_FLAG_CC;
1250         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1251         ccw->flags = 0;
1252         ccw->count = 8;
1253         ccw->cda = (__u32)(addr_t) count_data;
1254
1255         cqr->block = NULL;
1256         cqr->startdev = device;
1257         cqr->memdev = device;
1258         cqr->retries = 0;
1259         cqr->buildclk = get_clock();
1260         cqr->status = DASD_CQR_FILLED;
1261         return cqr;
1262 }
1263
1264 /*
1265  * This is the callback function for the init_analysis cqr. It saves
1266  * the status of the initial analysis ccw before it frees it and kicks
1267  * the device to continue the startup sequence. This will call
1268  * dasd_eckd_do_analysis again (if the devices has not been marked
1269  * for deletion in the meantime).
1270  */
1271 static void
1272 dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, void *data)
1273 {
1274         struct dasd_eckd_private *private;
1275         struct dasd_device *device;
1276
1277         device = init_cqr->startdev;
1278         private = (struct dasd_eckd_private *) device->private;
1279         private->init_cqr_status = init_cqr->status;
1280         dasd_sfree_request(init_cqr, device);
1281         dasd_kick_device(device);
1282 }
1283
1284 static int
1285 dasd_eckd_start_analysis(struct dasd_block *block)
1286 {
1287         struct dasd_eckd_private *private;
1288         struct dasd_ccw_req *init_cqr;
1289
1290         private = (struct dasd_eckd_private *) block->base->private;
1291         init_cqr = dasd_eckd_analysis_ccw(block->base);
1292         if (IS_ERR(init_cqr))
1293                 return PTR_ERR(init_cqr);
1294         init_cqr->callback = dasd_eckd_analysis_callback;
1295         init_cqr->callback_data = NULL;
1296         init_cqr->expires = 5*HZ;
1297         dasd_add_request_head(init_cqr);
1298         return -EAGAIN;
1299 }
1300
1301 static int
1302 dasd_eckd_end_analysis(struct dasd_block *block)
1303 {
1304         struct dasd_device *device;
1305         struct dasd_eckd_private *private;
1306         struct eckd_count *count_area;
1307         unsigned int sb, blk_per_trk;
1308         int status, i;
1309
1310         device = block->base;
1311         private = (struct dasd_eckd_private *) device->private;
1312         status = private->init_cqr_status;
1313         private->init_cqr_status = -1;
1314         if (status != DASD_CQR_DONE) {
1315                 dev_warn(&device->cdev->dev,
1316                             "The DASD is not formatted\n");
1317                 return -EMEDIUMTYPE;
1318         }
1319
1320         private->uses_cdl = 1;
1321         /* Check Track 0 for Compatible Disk Layout */
1322         count_area = NULL;
1323         for (i = 0; i < 3; i++) {
1324                 if (private->count_area[i].kl != 4 ||
1325                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
1326                         private->uses_cdl = 0;
1327                         break;
1328                 }
1329         }
1330         if (i == 3)
1331                 count_area = &private->count_area[4];
1332
1333         if (private->uses_cdl == 0) {
1334                 for (i = 0; i < 5; i++) {
1335                         if ((private->count_area[i].kl != 0) ||
1336                             (private->count_area[i].dl !=
1337                              private->count_area[0].dl))
1338                                 break;
1339                 }
1340                 if (i == 5)
1341                         count_area = &private->count_area[0];
1342         } else {
1343                 if (private->count_area[3].record == 1)
1344                         dev_warn(&device->cdev->dev,
1345                                  "Track 0 has no records following the VTOC\n");
1346         }
1347         if (count_area != NULL && count_area->kl == 0) {
1348                 /* we found notthing violating our disk layout */
1349                 if (dasd_check_blocksize(count_area->dl) == 0)
1350                         block->bp_block = count_area->dl;
1351         }
1352         if (block->bp_block == 0) {
1353                 dev_warn(&device->cdev->dev,
1354                          "The disk layout of the DASD is not supported\n");
1355                 return -EMEDIUMTYPE;
1356         }
1357         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1358         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1359                 block->s2b_shift++;
1360
1361         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1362         block->blocks = (private->real_cyl *
1363                           private->rdc_data.trk_per_cyl *
1364                           blk_per_trk);
1365
1366         dev_info(&device->cdev->dev,
1367                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
1368                  "%s\n", (block->bp_block >> 10),
1369                  ((private->real_cyl *
1370                    private->rdc_data.trk_per_cyl *
1371                    blk_per_trk * (block->bp_block >> 9)) >> 1),
1372                  ((blk_per_trk * block->bp_block) >> 10),
1373                  private->uses_cdl ?
1374                  "compatible disk layout" : "linux disk layout");
1375
1376         return 0;
1377 }
1378
1379 static int dasd_eckd_do_analysis(struct dasd_block *block)
1380 {
1381         struct dasd_eckd_private *private;
1382
1383         private = (struct dasd_eckd_private *) block->base->private;
1384         if (private->init_cqr_status < 0)
1385                 return dasd_eckd_start_analysis(block);
1386         else
1387                 return dasd_eckd_end_analysis(block);
1388 }
1389
1390 static int dasd_eckd_ready_to_online(struct dasd_device *device)
1391 {
1392         return dasd_alias_add_device(device);
1393 };
1394
1395 static int dasd_eckd_online_to_ready(struct dasd_device *device)
1396 {
1397         return dasd_alias_remove_device(device);
1398 };
1399
1400 static int
1401 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
1402 {
1403         struct dasd_eckd_private *private;
1404
1405         private = (struct dasd_eckd_private *) block->base->private;
1406         if (dasd_check_blocksize(block->bp_block) == 0) {
1407                 geo->sectors = recs_per_track(&private->rdc_data,
1408                                               0, block->bp_block);
1409         }
1410         geo->cylinders = private->rdc_data.no_cyl;
1411         geo->heads = private->rdc_data.trk_per_cyl;
1412         return 0;
1413 }
1414
1415 static struct dasd_ccw_req *
1416 dasd_eckd_format_device(struct dasd_device * device,
1417                         struct format_data_t * fdata)
1418 {
1419         struct dasd_eckd_private *private;
1420         struct dasd_ccw_req *fcp;
1421         struct eckd_count *ect;
1422         struct ccw1 *ccw;
1423         void *data;
1424         int rpt;
1425         struct ch_t address;
1426         int cplength, datasize;
1427         int i;
1428         int intensity = 0;
1429         int r0_perm;
1430
1431         private = (struct dasd_eckd_private *) device->private;
1432         rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
1433         set_ch_t(&address,
1434                  fdata->start_unit / private->rdc_data.trk_per_cyl,
1435                  fdata->start_unit % private->rdc_data.trk_per_cyl);
1436
1437         /* Sanity checks. */
1438         if (fdata->start_unit >=
1439             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
1440                 dev_warn(&device->cdev->dev, "Start track number %d used in "
1441                          "formatting is too big\n", fdata->start_unit);
1442                 return ERR_PTR(-EINVAL);
1443         }
1444         if (fdata->start_unit > fdata->stop_unit) {
1445                 dev_warn(&device->cdev->dev, "Start track %d used in "
1446                          "formatting exceeds end track\n", fdata->start_unit);
1447                 return ERR_PTR(-EINVAL);
1448         }
1449         if (dasd_check_blocksize(fdata->blksize) != 0) {
1450                 dev_warn(&device->cdev->dev,
1451                          "The DASD cannot be formatted with block size %d\n",
1452                          fdata->blksize);
1453                 return ERR_PTR(-EINVAL);
1454         }
1455
1456         /*
1457          * fdata->intensity is a bit string that tells us what to do:
1458          *   Bit 0: write record zero
1459          *   Bit 1: write home address, currently not supported
1460          *   Bit 2: invalidate tracks
1461          *   Bit 3: use OS/390 compatible disk layout (cdl)
1462          *   Bit 4: do not allow storage subsystem to modify record zero
1463          * Only some bit combinations do make sense.
1464          */
1465         if (fdata->intensity & 0x10) {
1466                 r0_perm = 0;
1467                 intensity = fdata->intensity & ~0x10;
1468         } else {
1469                 r0_perm = 1;
1470                 intensity = fdata->intensity;
1471         }
1472         switch (intensity) {
1473         case 0x00:      /* Normal format */
1474         case 0x08:      /* Normal format, use cdl. */
1475                 cplength = 2 + rpt;
1476                 datasize = sizeof(struct DE_eckd_data) +
1477                         sizeof(struct LO_eckd_data) +
1478                         rpt * sizeof(struct eckd_count);
1479                 break;
1480         case 0x01:      /* Write record zero and format track. */
1481         case 0x09:      /* Write record zero and format track, use cdl. */
1482                 cplength = 3 + rpt;
1483                 datasize = sizeof(struct DE_eckd_data) +
1484                         sizeof(struct LO_eckd_data) +
1485                         sizeof(struct eckd_count) +
1486                         rpt * sizeof(struct eckd_count);
1487                 break;
1488         case 0x04:      /* Invalidate track. */
1489         case 0x0c:      /* Invalidate track, use cdl. */
1490                 cplength = 3;
1491                 datasize = sizeof(struct DE_eckd_data) +
1492                         sizeof(struct LO_eckd_data) +
1493                         sizeof(struct eckd_count);
1494                 break;
1495         default:
1496                 dev_warn(&device->cdev->dev, "An I/O control call used "
1497                          "incorrect flags 0x%x\n", fdata->intensity);
1498                 return ERR_PTR(-EINVAL);
1499         }
1500         /* Allocate the format ccw request. */
1501         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1502         if (IS_ERR(fcp))
1503                 return fcp;
1504
1505         data = fcp->data;
1506         ccw = fcp->cpaddr;
1507
1508         switch (intensity & ~0x08) {
1509         case 0x00: /* Normal format. */
1510                 define_extent(ccw++, (struct DE_eckd_data *) data,
1511                               fdata->start_unit, fdata->start_unit,
1512                               DASD_ECKD_CCW_WRITE_CKD, device);
1513                 /* grant subsystem permission to format R0 */
1514                 if (r0_perm)
1515                         ((struct DE_eckd_data *)data)->ga_extended |= 0x04;
1516                 data += sizeof(struct DE_eckd_data);
1517                 ccw[-1].flags |= CCW_FLAG_CC;
1518                 locate_record(ccw++, (struct LO_eckd_data *) data,
1519                               fdata->start_unit, 0, rpt,
1520                               DASD_ECKD_CCW_WRITE_CKD, device,
1521                               fdata->blksize);
1522                 data += sizeof(struct LO_eckd_data);
1523                 break;
1524         case 0x01: /* Write record zero + format track. */
1525                 define_extent(ccw++, (struct DE_eckd_data *) data,
1526                               fdata->start_unit, fdata->start_unit,
1527                               DASD_ECKD_CCW_WRITE_RECORD_ZERO,
1528                               device);
1529                 data += sizeof(struct DE_eckd_data);
1530                 ccw[-1].flags |= CCW_FLAG_CC;
1531                 locate_record(ccw++, (struct LO_eckd_data *) data,
1532                               fdata->start_unit, 0, rpt + 1,
1533                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
1534                               device->block->bp_block);
1535                 data += sizeof(struct LO_eckd_data);
1536                 break;
1537         case 0x04: /* Invalidate track. */
1538                 define_extent(ccw++, (struct DE_eckd_data *) data,
1539                               fdata->start_unit, fdata->start_unit,
1540                               DASD_ECKD_CCW_WRITE_CKD, device);
1541                 data += sizeof(struct DE_eckd_data);
1542                 ccw[-1].flags |= CCW_FLAG_CC;
1543                 locate_record(ccw++, (struct LO_eckd_data *) data,
1544                               fdata->start_unit, 0, 1,
1545                               DASD_ECKD_CCW_WRITE_CKD, device, 8);
1546                 data += sizeof(struct LO_eckd_data);
1547                 break;
1548         }
1549         if (intensity & 0x01) { /* write record zero */
1550                 ect = (struct eckd_count *) data;
1551                 data += sizeof(struct eckd_count);
1552                 ect->cyl = address.cyl;
1553                 ect->head = address.head;
1554                 ect->record = 0;
1555                 ect->kl = 0;
1556                 ect->dl = 8;
1557                 ccw[-1].flags |= CCW_FLAG_CC;
1558                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
1559                 ccw->flags = CCW_FLAG_SLI;
1560                 ccw->count = 8;
1561                 ccw->cda = (__u32)(addr_t) ect;
1562                 ccw++;
1563         }
1564         if ((intensity & ~0x08) & 0x04) {       /* erase track */
1565                 ect = (struct eckd_count *) data;
1566                 data += sizeof(struct eckd_count);
1567                 ect->cyl = address.cyl;
1568                 ect->head = address.head;
1569                 ect->record = 1;
1570                 ect->kl = 0;
1571                 ect->dl = 0;
1572                 ccw[-1].flags |= CCW_FLAG_CC;
1573                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1574                 ccw->flags = CCW_FLAG_SLI;
1575                 ccw->count = 8;
1576                 ccw->cda = (__u32)(addr_t) ect;
1577         } else {                /* write remaining records */
1578                 for (i = 0; i < rpt; i++) {
1579                         ect = (struct eckd_count *) data;
1580                         data += sizeof(struct eckd_count);
1581                         ect->cyl = address.cyl;
1582                         ect->head = address.head;
1583                         ect->record = i + 1;
1584                         ect->kl = 0;
1585                         ect->dl = fdata->blksize;
1586                         /* Check for special tracks 0-1 when formatting CDL */
1587                         if ((intensity & 0x08) &&
1588                             fdata->start_unit == 0) {
1589                                 if (i < 3) {
1590                                         ect->kl = 4;
1591                                         ect->dl = sizes_trk0[i] - 4;
1592                                 }
1593                         }
1594                         if ((intensity & 0x08) &&
1595                             fdata->start_unit == 1) {
1596                                 ect->kl = 44;
1597                                 ect->dl = LABEL_SIZE - 44;
1598                         }
1599                         ccw[-1].flags |= CCW_FLAG_CC;
1600                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1601                         ccw->flags = CCW_FLAG_SLI;
1602                         ccw->count = 8;
1603                         ccw->cda = (__u32)(addr_t) ect;
1604                         ccw++;
1605                 }
1606         }
1607         fcp->startdev = device;
1608         fcp->memdev = device;
1609         clear_bit(DASD_CQR_FLAGS_USE_ERP, &fcp->flags);
1610         fcp->retries = 5;       /* set retry counter to enable default ERP */
1611         fcp->buildclk = get_clock();
1612         fcp->status = DASD_CQR_FILLED;
1613         return fcp;
1614 }
1615
1616 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
1617 {
1618         cqr->status = DASD_CQR_FILLED;
1619         if (cqr->block && (cqr->startdev != cqr->block->base)) {
1620                 dasd_eckd_reset_ccw_to_base_io(cqr);
1621                 cqr->startdev = cqr->block->base;
1622         }
1623 };
1624
1625 static dasd_erp_fn_t
1626 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
1627 {
1628         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
1629         struct ccw_device *cdev = device->cdev;
1630
1631         switch (cdev->id.cu_type) {
1632         case 0x3990:
1633         case 0x2105:
1634         case 0x2107:
1635         case 0x1750:
1636                 return dasd_3990_erp_action;
1637         case 0x9343:
1638         case 0x3880:
1639         default:
1640                 return dasd_default_erp_action;
1641         }
1642 }
1643
1644 static dasd_erp_fn_t
1645 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
1646 {
1647         return dasd_default_erp_postaction;
1648 }
1649
1650
1651 static void dasd_eckd_handle_unsolicited_interrupt(struct dasd_device *device,
1652                                                    struct irb *irb)
1653 {
1654         char mask;
1655         char *sense = NULL;
1656
1657         /* first of all check for state change pending interrupt */
1658         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
1659         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
1660                 dasd_generic_handle_state_change(device);
1661                 return;
1662         }
1663
1664         /* summary unit check */
1665         if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
1666             (irb->ecw[7] == 0x0D)) {
1667                 dasd_alias_handle_summary_unit_check(device, irb);
1668                 return;
1669         }
1670
1671         sense = dasd_get_sense(irb);
1672         /* service information message SIM */
1673         if (sense && !(sense[27] & DASD_SENSE_BIT_0) &&
1674             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
1675                 dasd_3990_erp_handle_sim(device, sense);
1676                 dasd_schedule_device_bh(device);
1677                 return;
1678         }
1679
1680         if ((scsw_cc(&irb->scsw) == 1) &&
1681             (scsw_fctl(&irb->scsw) & SCSW_FCTL_START_FUNC) &&
1682             (scsw_actl(&irb->scsw) & SCSW_ACTL_START_PEND) &&
1683             (scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND)) {
1684                 /* fake irb do nothing, they are handled elsewhere */
1685                 dasd_schedule_device_bh(device);
1686                 return;
1687         }
1688
1689         if (!sense) {
1690                 /* just report other unsolicited interrupts */
1691                 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1692                             "unsolicited interrupt received");
1693         } else {
1694                 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1695                             "unsolicited interrupt received "
1696                             "(sense available)");
1697                 device->discipline->dump_sense_dbf(device, irb, "unsolicited");
1698         }
1699
1700         dasd_schedule_device_bh(device);
1701         return;
1702 };
1703
1704
1705 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
1706                                                struct dasd_device *startdev,
1707                                                struct dasd_block *block,
1708                                                struct request *req,
1709                                                sector_t first_rec,
1710                                                sector_t last_rec,
1711                                                sector_t first_trk,
1712                                                sector_t last_trk,
1713                                                unsigned int first_offs,
1714                                                unsigned int last_offs,
1715                                                unsigned int blk_per_trk,
1716                                                unsigned int blksize)
1717 {
1718         struct dasd_eckd_private *private;
1719         unsigned long *idaws;
1720         struct LO_eckd_data *LO_data;
1721         struct dasd_ccw_req *cqr;
1722         struct ccw1 *ccw;
1723         struct req_iterator iter;
1724         struct bio_vec *bv;
1725         char *dst;
1726         unsigned int off;
1727         int count, cidaw, cplength, datasize;
1728         sector_t recid;
1729         unsigned char cmd, rcmd;
1730         int use_prefix;
1731         struct dasd_device *basedev;
1732
1733         basedev = block->base;
1734         private = (struct dasd_eckd_private *) basedev->private;
1735         if (rq_data_dir(req) == READ)
1736                 cmd = DASD_ECKD_CCW_READ_MT;
1737         else if (rq_data_dir(req) == WRITE)
1738                 cmd = DASD_ECKD_CCW_WRITE_MT;
1739         else
1740                 return ERR_PTR(-EINVAL);
1741
1742         /* Check struct bio and count the number of blocks for the request. */
1743         count = 0;
1744         cidaw = 0;
1745         rq_for_each_segment(bv, req, iter) {
1746                 if (bv->bv_len & (blksize - 1))
1747                         /* Eckd can only do full blocks. */
1748                         return ERR_PTR(-EINVAL);
1749                 count += bv->bv_len >> (block->s2b_shift + 9);
1750 #if defined(CONFIG_64BIT)
1751                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
1752                         cidaw += bv->bv_len >> (block->s2b_shift + 9);
1753 #endif
1754         }
1755         /* Paranoia. */
1756         if (count != last_rec - first_rec + 1)
1757                 return ERR_PTR(-EINVAL);
1758
1759         /* use the prefix command if available */
1760         use_prefix = private->features.feature[8] & 0x01;
1761         if (use_prefix) {
1762                 /* 1x prefix + number of blocks */
1763                 cplength = 2 + count;
1764                 /* 1x prefix + cidaws*sizeof(long) */
1765                 datasize = sizeof(struct PFX_eckd_data) +
1766                         sizeof(struct LO_eckd_data) +
1767                         cidaw * sizeof(unsigned long);
1768         } else {
1769                 /* 1x define extent + 1x locate record + number of blocks */
1770                 cplength = 2 + count;
1771                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
1772                 datasize = sizeof(struct DE_eckd_data) +
1773                         sizeof(struct LO_eckd_data) +
1774                         cidaw * sizeof(unsigned long);
1775         }
1776         /* Find out the number of additional locate record ccws for cdl. */
1777         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
1778                 if (last_rec >= 2*blk_per_trk)
1779                         count = 2*blk_per_trk - first_rec;
1780                 cplength += count;
1781                 datasize += count*sizeof(struct LO_eckd_data);
1782         }
1783         /* Allocate the ccw request. */
1784         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
1785                                    startdev);
1786         if (IS_ERR(cqr))
1787                 return cqr;
1788         ccw = cqr->cpaddr;
1789         /* First ccw is define extent or prefix. */
1790         if (use_prefix) {
1791                 if (prefix(ccw++, cqr->data, first_trk,
1792                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
1793                         /* Clock not in sync and XRC is enabled.
1794                          * Try again later.
1795                          */
1796                         dasd_sfree_request(cqr, startdev);
1797                         return ERR_PTR(-EAGAIN);
1798                 }
1799                 idaws = (unsigned long *) (cqr->data +
1800                                            sizeof(struct PFX_eckd_data));
1801         } else {
1802                 if (define_extent(ccw++, cqr->data, first_trk,
1803                                   last_trk, cmd, startdev) == -EAGAIN) {
1804                         /* Clock not in sync and XRC is enabled.
1805                          * Try again later.
1806                          */
1807                         dasd_sfree_request(cqr, startdev);
1808                         return ERR_PTR(-EAGAIN);
1809                 }
1810                 idaws = (unsigned long *) (cqr->data +
1811                                            sizeof(struct DE_eckd_data));
1812         }
1813         /* Build locate_record+read/write/ccws. */
1814         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
1815         recid = first_rec;
1816         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
1817                 /* Only standard blocks so there is just one locate record. */
1818                 ccw[-1].flags |= CCW_FLAG_CC;
1819                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
1820                               last_rec - recid + 1, cmd, basedev, blksize);
1821         }
1822         rq_for_each_segment(bv, req, iter) {
1823                 dst = page_address(bv->bv_page) + bv->bv_offset;
1824                 if (dasd_page_cache) {
1825                         char *copy = kmem_cache_alloc(dasd_page_cache,
1826                                                       GFP_DMA | __GFP_NOWARN);
1827                         if (copy && rq_data_dir(req) == WRITE)
1828                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
1829                         if (copy)
1830                                 dst = copy + bv->bv_offset;
1831                 }
1832                 for (off = 0; off < bv->bv_len; off += blksize) {
1833                         sector_t trkid = recid;
1834                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
1835                         rcmd = cmd;
1836                         count = blksize;
1837                         /* Locate record for cdl special block ? */
1838                         if (private->uses_cdl && recid < 2*blk_per_trk) {
1839                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
1840                                         rcmd |= 0x8;
1841                                         count = dasd_eckd_cdl_reclen(recid);
1842                                         if (count < blksize &&
1843                                             rq_data_dir(req) == READ)
1844                                                 memset(dst + count, 0xe5,
1845                                                        blksize - count);
1846                                 }
1847                                 ccw[-1].flags |= CCW_FLAG_CC;
1848                                 locate_record(ccw++, LO_data++,
1849                                               trkid, recoffs + 1,
1850                                               1, rcmd, basedev, count);
1851                         }
1852                         /* Locate record for standard blocks ? */
1853                         if (private->uses_cdl && recid == 2*blk_per_trk) {
1854                                 ccw[-1].flags |= CCW_FLAG_CC;
1855                                 locate_record(ccw++, LO_data++,
1856                                               trkid, recoffs + 1,
1857                                               last_rec - recid + 1,
1858                                               cmd, basedev, count);
1859                         }
1860                         /* Read/write ccw. */
1861                         ccw[-1].flags |= CCW_FLAG_CC;
1862                         ccw->cmd_code = rcmd;
1863                         ccw->count = count;
1864                         if (idal_is_needed(dst, blksize)) {
1865                                 ccw->cda = (__u32)(addr_t) idaws;
1866                                 ccw->flags = CCW_FLAG_IDA;
1867                                 idaws = idal_create_words(idaws, dst, blksize);
1868                         } else {
1869                                 ccw->cda = (__u32)(addr_t) dst;
1870                                 ccw->flags = 0;
1871                         }
1872                         ccw++;
1873                         dst += blksize;
1874                         recid++;
1875                 }
1876         }
1877         if (blk_noretry_request(req) ||
1878             block->base->features & DASD_FEATURE_FAILFAST)
1879                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1880         cqr->startdev = startdev;
1881         cqr->memdev = startdev;
1882         cqr->block = block;
1883         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
1884         cqr->lpm = private->path_data.ppm;
1885         cqr->retries = 256;
1886         cqr->buildclk = get_clock();
1887         cqr->status = DASD_CQR_FILLED;
1888         return cqr;
1889 }
1890
1891 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
1892                                                struct dasd_device *startdev,
1893                                                struct dasd_block *block,
1894                                                struct request *req,
1895                                                sector_t first_rec,
1896                                                sector_t last_rec,
1897                                                sector_t first_trk,
1898                                                sector_t last_trk,
1899                                                unsigned int first_offs,
1900                                                unsigned int last_offs,
1901                                                unsigned int blk_per_trk,
1902                                                unsigned int blksize)
1903 {
1904         struct dasd_eckd_private *private;
1905         unsigned long *idaws;
1906         struct dasd_ccw_req *cqr;
1907         struct ccw1 *ccw;
1908         struct req_iterator iter;
1909         struct bio_vec *bv;
1910         char *dst, *idaw_dst;
1911         unsigned int cidaw, cplength, datasize;
1912         unsigned int tlf;
1913         sector_t recid;
1914         unsigned char cmd;
1915         struct dasd_device *basedev;
1916         unsigned int trkcount, count, count_to_trk_end;
1917         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
1918         unsigned char new_track, end_idaw;
1919         sector_t trkid;
1920         unsigned int recoffs;
1921
1922         basedev = block->base;
1923         private = (struct dasd_eckd_private *) basedev->private;
1924         if (rq_data_dir(req) == READ)
1925                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
1926         else if (rq_data_dir(req) == WRITE)
1927                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
1928         else
1929                 return ERR_PTR(-EINVAL);
1930
1931         /* Track based I/O needs IDAWs for each page, and not just for
1932          * 64 bit addresses. We need additional idals for pages
1933          * that get filled from two tracks, so we use the number
1934          * of records as upper limit.
1935          */
1936         cidaw = last_rec - first_rec + 1;
1937         trkcount = last_trk - first_trk + 1;
1938
1939         /* 1x prefix + one read/write ccw per track */
1940         cplength = 1 + trkcount;
1941
1942         /* on 31-bit we need space for two 32 bit addresses per page
1943          * on 64-bit one 64 bit address
1944          */
1945         datasize = sizeof(struct PFX_eckd_data) +
1946                 cidaw * sizeof(unsigned long long);
1947
1948         /* Allocate the ccw request. */
1949         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
1950                                    startdev);
1951         if (IS_ERR(cqr))
1952                 return cqr;
1953         ccw = cqr->cpaddr;
1954         /* transfer length factor: how many bytes to read from the last track */
1955         if (first_trk == last_trk)
1956                 tlf = last_offs - first_offs + 1;
1957         else
1958                 tlf = last_offs + 1;
1959         tlf *= blksize;
1960
1961         if (prefix_LRE(ccw++, cqr->data, first_trk,
1962                        last_trk, cmd, basedev, startdev,
1963                        1 /* format */, first_offs + 1,
1964                        trkcount, blksize,
1965                        tlf) == -EAGAIN) {
1966                 /* Clock not in sync and XRC is enabled.
1967                  * Try again later.
1968                  */
1969                 dasd_sfree_request(cqr, startdev);
1970                 return ERR_PTR(-EAGAIN);
1971         }
1972
1973         /*
1974          * The translation of request into ccw programs must meet the
1975          * following conditions:
1976          * - all idaws but the first and the last must address full pages
1977          *   (or 2K blocks on 31-bit)
1978          * - the scope of a ccw and it's idal ends with the track boundaries
1979          */
1980         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
1981         recid = first_rec;
1982         new_track = 1;
1983         end_idaw = 0;
1984         len_to_track_end = 0;
1985         idaw_dst = 0;
1986         idaw_len = 0;
1987         rq_for_each_segment(bv, req, iter) {
1988                 dst = page_address(bv->bv_page) + bv->bv_offset;
1989                 seg_len = bv->bv_len;
1990                 while (seg_len) {
1991                         if (new_track) {
1992                                 trkid = recid;
1993                                 recoffs = sector_div(trkid, blk_per_trk);
1994                                 count_to_trk_end = blk_per_trk - recoffs;
1995                                 count = min((last_rec - recid + 1),
1996                                             (sector_t)count_to_trk_end);
1997                                 len_to_track_end = count * blksize;
1998                                 ccw[-1].flags |= CCW_FLAG_CC;
1999                                 ccw->cmd_code = cmd;
2000                                 ccw->count = len_to_track_end;
2001                                 ccw->cda = (__u32)(addr_t)idaws;
2002                                 ccw->flags = CCW_FLAG_IDA;
2003                                 ccw++;
2004                                 recid += count;
2005                                 new_track = 0;
2006                                 /* first idaw for a ccw may start anywhere */
2007                                 if (!idaw_dst)
2008                                         idaw_dst = dst;
2009                         }
2010                         /* If we start a new idaw, we must make sure that it
2011                          * starts on an IDA_BLOCK_SIZE boundary.
2012                          * If we continue an idaw, we must make sure that the
2013                          * current segment begins where the so far accumulated
2014                          * idaw ends
2015                          */
2016                         if (!idaw_dst) {
2017                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2018                                         dasd_sfree_request(cqr, startdev);
2019                                         return ERR_PTR(-ERANGE);
2020                                 } else
2021                                         idaw_dst = dst;
2022                         }
2023                         if ((idaw_dst + idaw_len) != dst) {
2024                                 dasd_sfree_request(cqr, startdev);
2025                                 return ERR_PTR(-ERANGE);
2026                         }
2027                         part_len = min(seg_len, len_to_track_end);
2028                         seg_len -= part_len;
2029                         dst += part_len;
2030                         idaw_len += part_len;
2031                         len_to_track_end -= part_len;
2032                         /* collected memory area ends on an IDA_BLOCK border,
2033                          * -> create an idaw
2034                          * idal_create_words will handle cases where idaw_len
2035                          * is larger then IDA_BLOCK_SIZE
2036                          */
2037                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2038                                 end_idaw = 1;
2039                         /* We also need to end the idaw at track end */
2040                         if (!len_to_track_end) {
2041                                 new_track = 1;
2042                                 end_idaw = 1;
2043                         }
2044                         if (end_idaw) {
2045                                 idaws = idal_create_words(idaws, idaw_dst,
2046                                                           idaw_len);
2047                                 idaw_dst = 0;
2048                                 idaw_len = 0;
2049                                 end_idaw = 0;
2050                         }
2051                 }
2052         }
2053
2054         if (blk_noretry_request(req) ||
2055             block->base->features & DASD_FEATURE_FAILFAST)
2056                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2057         cqr->startdev = startdev;
2058         cqr->memdev = startdev;
2059         cqr->block = block;
2060         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
2061         cqr->lpm = private->path_data.ppm;
2062         cqr->retries = 256;
2063         cqr->buildclk = get_clock();
2064         cqr->status = DASD_CQR_FILLED;
2065         return cqr;
2066 }
2067
2068 static int prepare_itcw(struct itcw *itcw,
2069                         unsigned int trk, unsigned int totrk, int cmd,
2070                         struct dasd_device *basedev,
2071                         struct dasd_device *startdev,
2072                         unsigned int rec_on_trk, int count,
2073                         unsigned int blksize,
2074                         unsigned int total_data_size,
2075                         unsigned int tlf,
2076                         unsigned int blk_per_trk)
2077 {
2078         struct PFX_eckd_data pfxdata;
2079         struct dasd_eckd_private *basepriv, *startpriv;
2080         struct DE_eckd_data *dedata;
2081         struct LRE_eckd_data *lredata;
2082         struct dcw *dcw;
2083
2084         u32 begcyl, endcyl;
2085         u16 heads, beghead, endhead;
2086         u8 pfx_cmd;
2087
2088         int rc = 0;
2089         int sector = 0;
2090         int dn, d;
2091
2092
2093         /* setup prefix data */
2094         basepriv = (struct dasd_eckd_private *) basedev->private;
2095         startpriv = (struct dasd_eckd_private *) startdev->private;
2096         dedata = &pfxdata.define_extent;
2097         lredata = &pfxdata.locate_record;
2098
2099         memset(&pfxdata, 0, sizeof(pfxdata));
2100         pfxdata.format = 1; /* PFX with LRE */
2101         pfxdata.base_address = basepriv->ned->unit_addr;
2102         pfxdata.base_lss = basepriv->ned->ID;
2103         pfxdata.validity.define_extent = 1;
2104
2105         /* private uid is kept up to date, conf_data may be outdated */
2106         if (startpriv->uid.type != UA_BASE_DEVICE) {
2107                 pfxdata.validity.verify_base = 1;
2108                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2109                         pfxdata.validity.hyper_pav = 1;
2110         }
2111
2112         switch (cmd) {
2113         case DASD_ECKD_CCW_READ_TRACK_DATA:
2114                 dedata->mask.perm = 0x1;
2115                 dedata->attributes.operation = basepriv->attrib.operation;
2116                 dedata->blk_size = blksize;
2117                 dedata->ga_extended |= 0x42;
2118                 lredata->operation.orientation = 0x0;
2119                 lredata->operation.operation = 0x0C;
2120                 lredata->auxiliary.check_bytes = 0x01;
2121                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2122                 break;
2123         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2124                 dedata->mask.perm = 0x02;
2125                 dedata->attributes.operation = basepriv->attrib.operation;
2126                 dedata->blk_size = blksize;
2127                 rc = check_XRC_on_prefix(&pfxdata, basedev);
2128                 dedata->ga_extended |= 0x42;
2129                 lredata->operation.orientation = 0x0;
2130                 lredata->operation.operation = 0x3F;
2131                 lredata->extended_operation = 0x23;
2132                 lredata->auxiliary.check_bytes = 0x2;
2133                 pfx_cmd = DASD_ECKD_CCW_PFX;
2134                 break;
2135         default:
2136                 DBF_DEV_EVENT(DBF_ERR, basedev,
2137                               "prepare itcw, unknown opcode 0x%x", cmd);
2138                 BUG();
2139                 break;
2140         }
2141         if (rc)
2142                 return rc;
2143
2144         dedata->attributes.mode = 0x3;  /* ECKD */
2145
2146         heads = basepriv->rdc_data.trk_per_cyl;
2147         begcyl = trk / heads;
2148         beghead = trk % heads;
2149         endcyl = totrk / heads;
2150         endhead = totrk % heads;
2151
2152         /* check for sequential prestage - enhance cylinder range */
2153         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2154             dedata->attributes.operation == DASD_SEQ_ACCESS) {
2155
2156                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2157                         endcyl += basepriv->attrib.nr_cyl;
2158                 else
2159                         endcyl = (basepriv->real_cyl - 1);
2160         }
2161
2162         set_ch_t(&dedata->beg_ext, begcyl, beghead);
2163         set_ch_t(&dedata->end_ext, endcyl, endhead);
2164
2165         dedata->ep_format = 0x20; /* records per track is valid */
2166         dedata->ep_rec_per_track = blk_per_trk;
2167
2168         if (rec_on_trk) {
2169                 switch (basepriv->rdc_data.dev_type) {
2170                 case 0x3390:
2171                         dn = ceil_quot(blksize + 6, 232);
2172                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
2173                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
2174                         break;
2175                 case 0x3380:
2176                         d = 7 + ceil_quot(blksize + 12, 32);
2177                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
2178                         break;
2179                 }
2180         }
2181
2182         lredata->auxiliary.length_valid = 1;
2183         lredata->auxiliary.length_scope = 1;
2184         lredata->auxiliary.imbedded_ccw_valid = 1;
2185         lredata->length = tlf;
2186         lredata->imbedded_ccw = cmd;
2187         lredata->count = count;
2188         lredata->sector = sector;
2189         set_ch_t(&lredata->seek_addr, begcyl, beghead);
2190         lredata->search_arg.cyl = lredata->seek_addr.cyl;
2191         lredata->search_arg.head = lredata->seek_addr.head;
2192         lredata->search_arg.record = rec_on_trk;
2193
2194         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
2195                      &pfxdata, sizeof(pfxdata), total_data_size);
2196
2197         return rc;
2198 }
2199
2200 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
2201                                                struct dasd_device *startdev,
2202                                                struct dasd_block *block,
2203                                                struct request *req,
2204                                                sector_t first_rec,
2205                                                sector_t last_rec,
2206                                                sector_t first_trk,
2207                                                sector_t last_trk,
2208                                                unsigned int first_offs,
2209                                                unsigned int last_offs,
2210                                                unsigned int blk_per_trk,
2211                                                unsigned int blksize)
2212 {
2213         struct dasd_eckd_private *private;
2214         struct dasd_ccw_req *cqr;
2215         struct req_iterator iter;
2216         struct bio_vec *bv;
2217         char *dst;
2218         unsigned int trkcount, ctidaw;
2219         unsigned char cmd;
2220         struct dasd_device *basedev;
2221         unsigned int tlf;
2222         struct itcw *itcw;
2223         struct tidaw *last_tidaw = NULL;
2224         int itcw_op;
2225         size_t itcw_size;
2226
2227         basedev = block->base;
2228         private = (struct dasd_eckd_private *) basedev->private;
2229         if (rq_data_dir(req) == READ) {
2230                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2231                 itcw_op = ITCW_OP_READ;
2232         } else if (rq_data_dir(req) == WRITE) {
2233                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2234                 itcw_op = ITCW_OP_WRITE;
2235         } else
2236                 return ERR_PTR(-EINVAL);
2237
2238         /* trackbased I/O needs address all memory via TIDAWs,
2239          * not just for 64 bit addresses. This allows us to map
2240          * each segment directly to one tidaw.
2241          */
2242         trkcount = last_trk - first_trk + 1;
2243         ctidaw = 0;
2244         rq_for_each_segment(bv, req, iter) {
2245                 ++ctidaw;
2246         }
2247
2248         /* Allocate the ccw request. */
2249         itcw_size = itcw_calc_size(0, ctidaw, 0);
2250         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2251         if (IS_ERR(cqr))
2252                 return cqr;
2253
2254         cqr->cpmode = 1;
2255         cqr->startdev = startdev;
2256         cqr->memdev = startdev;
2257         cqr->block = block;
2258         cqr->expires = 100*HZ;
2259         cqr->buildclk = get_clock();
2260         cqr->status = DASD_CQR_FILLED;
2261         cqr->retries = 10;
2262
2263         /* transfer length factor: how many bytes to read from the last track */
2264         if (first_trk == last_trk)
2265                 tlf = last_offs - first_offs + 1;
2266         else
2267                 tlf = last_offs + 1;
2268         tlf *= blksize;
2269
2270         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
2271         cqr->cpaddr = itcw_get_tcw(itcw);
2272
2273         if (prepare_itcw(itcw, first_trk, last_trk,
2274                          cmd, basedev, startdev,
2275                          first_offs + 1,
2276                          trkcount, blksize,
2277                          (last_rec - first_rec + 1) * blksize,
2278                          tlf, blk_per_trk) == -EAGAIN) {
2279                 /* Clock not in sync and XRC is enabled.
2280                  * Try again later.
2281                  */
2282                 dasd_sfree_request(cqr, startdev);
2283                 return ERR_PTR(-EAGAIN);
2284         }
2285
2286         /*
2287          * A tidaw can address 4k of memory, but must not cross page boundaries
2288          * We can let the block layer handle this by setting
2289          * blk_queue_segment_boundary to page boundaries and
2290          * blk_max_segment_size to page size when setting up the request queue.
2291          */
2292         rq_for_each_segment(bv, req, iter) {
2293                 dst = page_address(bv->bv_page) + bv->bv_offset;
2294                 last_tidaw = itcw_add_tidaw(itcw, 0x00, dst, bv->bv_len);
2295                 if (IS_ERR(last_tidaw))
2296                         return (struct dasd_ccw_req *)last_tidaw;
2297         }
2298
2299         last_tidaw->flags |= 0x80;
2300         itcw_finalize(itcw);
2301
2302         if (blk_noretry_request(req) ||
2303             block->base->features & DASD_FEATURE_FAILFAST)
2304                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2305         cqr->startdev = startdev;
2306         cqr->memdev = startdev;
2307         cqr->block = block;
2308         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
2309         cqr->lpm = private->path_data.ppm;
2310         cqr->retries = 256;
2311         cqr->buildclk = get_clock();
2312         cqr->status = DASD_CQR_FILLED;
2313         return cqr;
2314 }
2315
2316 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
2317                                                struct dasd_block *block,
2318                                                struct request *req)
2319 {
2320         int tpm, cmdrtd, cmdwtd;
2321         int use_prefix;
2322 #if defined(CONFIG_64BIT)
2323         int fcx_in_css, fcx_in_gneq, fcx_in_features;
2324 #endif
2325         struct dasd_eckd_private *private;
2326         struct dasd_device *basedev;
2327         sector_t first_rec, last_rec;
2328         sector_t first_trk, last_trk;
2329         unsigned int first_offs, last_offs;
2330         unsigned int blk_per_trk, blksize;
2331         int cdlspecial;
2332         struct dasd_ccw_req *cqr;
2333
2334         basedev = block->base;
2335         private = (struct dasd_eckd_private *) basedev->private;
2336
2337         /* Calculate number of blocks/records per track. */
2338         blksize = block->bp_block;
2339         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2340         /* Calculate record id of first and last block. */
2341         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
2342         first_offs = sector_div(first_trk, blk_per_trk);
2343         last_rec = last_trk =
2344                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
2345         last_offs = sector_div(last_trk, blk_per_trk);
2346         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
2347
2348         /* is transport mode supported? */
2349 #if defined(CONFIG_64BIT)
2350         fcx_in_css = css_general_characteristics.fcx;
2351         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
2352         fcx_in_features = private->features.feature[40] & 0x80;
2353         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
2354 #else
2355         tpm = 0;
2356 #endif
2357
2358         /* is read track data and write track data in command mode supported? */
2359         cmdrtd = private->features.feature[9] & 0x20;
2360         cmdwtd = private->features.feature[12] & 0x40;
2361         use_prefix = private->features.feature[8] & 0x01;
2362
2363         cqr = NULL;
2364         if (cdlspecial || dasd_page_cache) {
2365                 /* do nothing, just fall through to the cmd mode single case */
2366         } else if (!dasd_nofcx && tpm && (first_trk == last_trk)) {
2367                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
2368                                                     first_rec, last_rec,
2369                                                     first_trk, last_trk,
2370                                                     first_offs, last_offs,
2371                                                     blk_per_trk, blksize);
2372                 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
2373                         cqr = NULL;
2374         } else if (use_prefix &&
2375                    (((rq_data_dir(req) == READ) && cmdrtd) ||
2376                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
2377                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
2378                                                    first_rec, last_rec,
2379                                                    first_trk, last_trk,
2380                                                    first_offs, last_offs,
2381                                                    blk_per_trk, blksize);
2382                 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
2383                         cqr = NULL;
2384         }
2385         if (!cqr)
2386                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
2387                                                     first_rec, last_rec,
2388                                                     first_trk, last_trk,
2389                                                     first_offs, last_offs,
2390                                                     blk_per_trk, blksize);
2391         return cqr;
2392 }
2393
2394 static int
2395 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
2396 {
2397         struct dasd_eckd_private *private;
2398         struct ccw1 *ccw;
2399         struct req_iterator iter;
2400         struct bio_vec *bv;
2401         char *dst, *cda;
2402         unsigned int blksize, blk_per_trk, off;
2403         sector_t recid;
2404         int status;
2405
2406         if (!dasd_page_cache)
2407                 goto out;
2408         private = (struct dasd_eckd_private *) cqr->block->base->private;
2409         blksize = cqr->block->bp_block;
2410         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2411         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
2412         ccw = cqr->cpaddr;
2413         /* Skip over define extent & locate record. */
2414         ccw++;
2415         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
2416                 ccw++;
2417         rq_for_each_segment(bv, req, iter) {
2418                 dst = page_address(bv->bv_page) + bv->bv_offset;
2419                 for (off = 0; off < bv->bv_len; off += blksize) {
2420                         /* Skip locate record. */
2421                         if (private->uses_cdl && recid <= 2*blk_per_trk)
2422                                 ccw++;
2423                         if (dst) {
2424                                 if (ccw->flags & CCW_FLAG_IDA)
2425                                         cda = *((char **)((addr_t) ccw->cda));
2426                                 else
2427                                         cda = (char *)((addr_t) ccw->cda);
2428                                 if (dst != cda) {
2429                                         if (rq_data_dir(req) == READ)
2430                                                 memcpy(dst, cda, bv->bv_len);
2431                                         kmem_cache_free(dasd_page_cache,
2432                                             (void *)((addr_t)cda & PAGE_MASK));
2433                                 }
2434                                 dst = NULL;
2435                         }
2436                         ccw++;
2437                         recid++;
2438                 }
2439         }
2440 out:
2441         status = cqr->status == DASD_CQR_DONE;
2442         dasd_sfree_request(cqr, cqr->memdev);
2443         return status;
2444 }
2445
2446 /*
2447  * Modify ccw/tcw in cqr so it can be started on a base device.
2448  *
2449  * Note that this is not enough to restart the cqr!
2450  * Either reset cqr->startdev as well (summary unit check handling)
2451  * or restart via separate cqr (as in ERP handling).
2452  */
2453 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
2454 {
2455         struct ccw1 *ccw;
2456         struct PFX_eckd_data *pfxdata;
2457         struct tcw *tcw;
2458         struct tccb *tccb;
2459         struct dcw *dcw;
2460
2461         if (cqr->cpmode == 1) {
2462                 tcw = cqr->cpaddr;
2463                 tccb = tcw_get_tccb(tcw);
2464                 dcw = (struct dcw *)&tccb->tca[0];
2465                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
2466                 pfxdata->validity.verify_base = 0;
2467                 pfxdata->validity.hyper_pav = 0;
2468         } else {
2469                 ccw = cqr->cpaddr;
2470                 pfxdata = cqr->data;
2471                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
2472                         pfxdata->validity.verify_base = 0;
2473                         pfxdata->validity.hyper_pav = 0;
2474                 }
2475         }
2476 }
2477
2478 #define DASD_ECKD_CHANQ_MAX_SIZE 4
2479
2480 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
2481                                                      struct dasd_block *block,
2482                                                      struct request *req)
2483 {
2484         struct dasd_eckd_private *private;
2485         struct dasd_device *startdev;
2486         unsigned long flags;
2487         struct dasd_ccw_req *cqr;
2488
2489         startdev = dasd_alias_get_start_dev(base);
2490         if (!startdev)
2491                 startdev = base;
2492         private = (struct dasd_eckd_private *) startdev->private;
2493         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
2494                 return ERR_PTR(-EBUSY);
2495
2496         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
2497         private->count++;
2498         cqr = dasd_eckd_build_cp(startdev, block, req);
2499         if (IS_ERR(cqr))
2500                 private->count--;
2501         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
2502         return cqr;
2503 }
2504
2505 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
2506                                    struct request *req)
2507 {
2508         struct dasd_eckd_private *private;
2509         unsigned long flags;
2510
2511         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
2512         private = (struct dasd_eckd_private *) cqr->memdev->private;
2513         private->count--;
2514         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
2515         return dasd_eckd_free_cp(cqr, req);
2516 }
2517
2518 static int
2519 dasd_eckd_fill_info(struct dasd_device * device,
2520                     struct dasd_information2_t * info)
2521 {
2522         struct dasd_eckd_private *private;
2523
2524         private = (struct dasd_eckd_private *) device->private;
2525         info->label_block = 2;
2526         info->FBA_layout = private->uses_cdl ? 0 : 1;
2527         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
2528         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
2529         memcpy(info->characteristics, &private->rdc_data,
2530                sizeof(struct dasd_eckd_characteristics));
2531         info->confdata_size = min((unsigned long)private->conf_len,
2532                                   sizeof(info->configuration_data));
2533         memcpy(info->configuration_data, private->conf_data,
2534                info->confdata_size);
2535         return 0;
2536 }
2537
2538 /*
2539  * SECTION: ioctl functions for eckd devices.
2540  */
2541
2542 /*
2543  * Release device ioctl.
2544  * Buils a channel programm to releases a prior reserved
2545  * (see dasd_eckd_reserve) device.
2546  */
2547 static int
2548 dasd_eckd_release(struct dasd_device *device)
2549 {
2550         struct dasd_ccw_req *cqr;
2551         int rc;
2552         struct ccw1 *ccw;
2553
2554         if (!capable(CAP_SYS_ADMIN))
2555                 return -EACCES;
2556
2557         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
2558         if (IS_ERR(cqr)) {
2559                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2560                             "Could not allocate initialization request");
2561                 return PTR_ERR(cqr);
2562         }
2563         ccw = cqr->cpaddr;
2564         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
2565         ccw->flags |= CCW_FLAG_SLI;
2566         ccw->count = 32;
2567         ccw->cda = (__u32)(addr_t) cqr->data;
2568         cqr->startdev = device;
2569         cqr->memdev = device;
2570         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2571         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2572         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2573         cqr->expires = 2 * HZ;
2574         cqr->buildclk = get_clock();
2575         cqr->status = DASD_CQR_FILLED;
2576
2577         rc = dasd_sleep_on_immediatly(cqr);
2578
2579         dasd_sfree_request(cqr, cqr->memdev);
2580         return rc;
2581 }
2582
2583 /*
2584  * Reserve device ioctl.
2585  * Options are set to 'synchronous wait for interrupt' and
2586  * 'timeout the request'. This leads to a terminate IO if
2587  * the interrupt is outstanding for a certain time.
2588  */
2589 static int
2590 dasd_eckd_reserve(struct dasd_device *device)
2591 {
2592         struct dasd_ccw_req *cqr;
2593         int rc;
2594         struct ccw1 *ccw;
2595
2596         if (!capable(CAP_SYS_ADMIN))
2597                 return -EACCES;
2598
2599         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
2600         if (IS_ERR(cqr)) {
2601                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2602                             "Could not allocate initialization request");
2603                 return PTR_ERR(cqr);
2604         }
2605         ccw = cqr->cpaddr;
2606         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
2607         ccw->flags |= CCW_FLAG_SLI;
2608         ccw->count = 32;
2609         ccw->cda = (__u32)(addr_t) cqr->data;
2610         cqr->startdev = device;
2611         cqr->memdev = device;
2612         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2613         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2614         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2615         cqr->expires = 2 * HZ;
2616         cqr->buildclk = get_clock();
2617         cqr->status = DASD_CQR_FILLED;
2618
2619         rc = dasd_sleep_on_immediatly(cqr);
2620
2621         dasd_sfree_request(cqr, cqr->memdev);
2622         return rc;
2623 }
2624
2625 /*
2626  * Steal lock ioctl - unconditional reserve device.
2627  * Buils a channel programm to break a device's reservation.
2628  * (unconditional reserve)
2629  */
2630 static int
2631 dasd_eckd_steal_lock(struct dasd_device *device)
2632 {
2633         struct dasd_ccw_req *cqr;
2634         int rc;
2635         struct ccw1 *ccw;
2636
2637         if (!capable(CAP_SYS_ADMIN))
2638                 return -EACCES;
2639
2640         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
2641         if (IS_ERR(cqr)) {
2642                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2643                             "Could not allocate initialization request");
2644                 return PTR_ERR(cqr);
2645         }
2646         ccw = cqr->cpaddr;
2647         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
2648         ccw->flags |= CCW_FLAG_SLI;
2649         ccw->count = 32;
2650         ccw->cda = (__u32)(addr_t) cqr->data;
2651         cqr->startdev = device;
2652         cqr->memdev = device;
2653         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2654         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2655         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2656         cqr->expires = 2 * HZ;
2657         cqr->buildclk = get_clock();
2658         cqr->status = DASD_CQR_FILLED;
2659
2660         rc = dasd_sleep_on_immediatly(cqr);
2661
2662         dasd_sfree_request(cqr, cqr->memdev);
2663         return rc;
2664 }
2665
2666 /*
2667  * Read performance statistics
2668  */
2669 static int
2670 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
2671 {
2672         struct dasd_psf_prssd_data *prssdp;
2673         struct dasd_rssd_perf_stats_t *stats;
2674         struct dasd_ccw_req *cqr;
2675         struct ccw1 *ccw;
2676         int rc;
2677
2678         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
2679                                    (sizeof(struct dasd_psf_prssd_data) +
2680                                     sizeof(struct dasd_rssd_perf_stats_t)),
2681                                    device);
2682         if (IS_ERR(cqr)) {
2683                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2684                             "Could not allocate initialization request");
2685                 return PTR_ERR(cqr);
2686         }
2687         cqr->startdev = device;
2688         cqr->memdev = device;
2689         cqr->retries = 0;
2690         cqr->expires = 10 * HZ;
2691
2692         /* Prepare for Read Subsystem Data */
2693         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
2694         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
2695         prssdp->order = PSF_ORDER_PRSSD;
2696         prssdp->suborder = 0x01;        /* Performance Statistics */
2697         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
2698
2699         ccw = cqr->cpaddr;
2700         ccw->cmd_code = DASD_ECKD_CCW_PSF;
2701         ccw->count = sizeof(struct dasd_psf_prssd_data);
2702         ccw->flags |= CCW_FLAG_CC;
2703         ccw->cda = (__u32)(addr_t) prssdp;
2704
2705         /* Read Subsystem Data - Performance Statistics */
2706         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
2707         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
2708
2709         ccw++;
2710         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
2711         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
2712         ccw->cda = (__u32)(addr_t) stats;
2713
2714         cqr->buildclk = get_clock();
2715         cqr->status = DASD_CQR_FILLED;
2716         rc = dasd_sleep_on(cqr);
2717         if (rc == 0) {
2718                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
2719                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
2720                 if (copy_to_user(argp, stats,
2721                                  sizeof(struct dasd_rssd_perf_stats_t)))
2722                         rc = -EFAULT;
2723         }
2724         dasd_sfree_request(cqr, cqr->memdev);
2725         return rc;
2726 }
2727
2728 /*
2729  * Get attributes (cache operations)
2730  * Returnes the cache attributes used in Define Extend (DE).
2731  */
2732 static int
2733 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
2734 {
2735         struct dasd_eckd_private *private =
2736                 (struct dasd_eckd_private *)device->private;
2737         struct attrib_data_t attrib = private->attrib;
2738         int rc;
2739
2740         if (!capable(CAP_SYS_ADMIN))
2741                 return -EACCES;
2742         if (!argp)
2743                 return -EINVAL;
2744
2745         rc = 0;
2746         if (copy_to_user(argp, (long *) &attrib,
2747                          sizeof(struct attrib_data_t)))
2748                 rc = -EFAULT;
2749
2750         return rc;
2751 }
2752
2753 /*
2754  * Set attributes (cache operations)
2755  * Stores the attributes for cache operation to be used in Define Extend (DE).
2756  */
2757 static int
2758 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
2759 {
2760         struct dasd_eckd_private *private =
2761                 (struct dasd_eckd_private *)device->private;
2762         struct attrib_data_t attrib;
2763
2764         if (!capable(CAP_SYS_ADMIN))
2765                 return -EACCES;
2766         if (!argp)
2767                 return -EINVAL;
2768
2769         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
2770                 return -EFAULT;
2771         private->attrib = attrib;
2772
2773         dev_info(&device->cdev->dev,
2774                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
2775                  private->attrib.operation, private->attrib.nr_cyl);
2776         return 0;
2777 }
2778
2779 /*
2780  * Issue syscall I/O to EMC Symmetrix array.
2781  * CCWs are PSF and RSSD
2782  */
2783 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
2784 {
2785         struct dasd_symmio_parms usrparm;
2786         char *psf_data, *rssd_result;
2787         struct dasd_ccw_req *cqr;
2788         struct ccw1 *ccw;
2789         int rc;
2790
2791         /* Copy parms from caller */
2792         rc = -EFAULT;
2793         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
2794                 goto out;
2795 #ifndef CONFIG_64BIT
2796         /* Make sure pointers are sane even on 31 bit. */
2797         if ((usrparm.psf_data >> 32) != 0 || (usrparm.rssd_result >> 32) != 0) {
2798                 rc = -EINVAL;
2799                 goto out;
2800         }
2801 #endif
2802         /* alloc I/O data area */
2803         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
2804         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
2805         if (!psf_data || !rssd_result) {
2806                 rc = -ENOMEM;
2807                 goto out_free;
2808         }
2809
2810         /* get syscall header from user space */
2811         rc = -EFAULT;
2812         if (copy_from_user(psf_data,
2813                            (void __user *)(unsigned long) usrparm.psf_data,
2814                            usrparm.psf_data_len))
2815                 goto out_free;
2816
2817         /* sanity check on syscall header */
2818         if (psf_data[0] != 0x17 && psf_data[1] != 0xce) {
2819                 rc = -EINVAL;
2820                 goto out_free;
2821         }
2822
2823         /* setup CCWs for PSF + RSSD */
2824         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
2825         if (IS_ERR(cqr)) {
2826                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2827                         "Could not allocate initialization request");
2828                 rc = PTR_ERR(cqr);
2829                 goto out_free;
2830         }
2831
2832         cqr->startdev = device;
2833         cqr->memdev = device;
2834         cqr->retries = 3;
2835         cqr->expires = 10 * HZ;
2836         cqr->buildclk = get_clock();
2837         cqr->status = DASD_CQR_FILLED;
2838
2839         /* Build the ccws */
2840         ccw = cqr->cpaddr;
2841
2842         /* PSF ccw */
2843         ccw->cmd_code = DASD_ECKD_CCW_PSF;
2844         ccw->count = usrparm.psf_data_len;
2845         ccw->flags |= CCW_FLAG_CC;
2846         ccw->cda = (__u32)(addr_t) psf_data;
2847
2848         ccw++;
2849
2850         /* RSSD ccw  */
2851         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
2852         ccw->count = usrparm.rssd_result_len;
2853         ccw->flags = CCW_FLAG_SLI ;
2854         ccw->cda = (__u32)(addr_t) rssd_result;
2855
2856         rc = dasd_sleep_on(cqr);
2857         if (rc)
2858                 goto out_sfree;
2859
2860         rc = -EFAULT;
2861         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
2862                            rssd_result, usrparm.rssd_result_len))
2863                 goto out_sfree;
2864         rc = 0;
2865
2866 out_sfree:
2867         dasd_sfree_request(cqr, cqr->memdev);
2868 out_free:
2869         kfree(rssd_result);
2870         kfree(psf_data);
2871 out:
2872         DBF_DEV_EVENT(DBF_WARNING, device, "Symmetrix ioctl: rc=%d", rc);
2873         return rc;
2874 }
2875
2876 static int
2877 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
2878 {
2879         struct dasd_device *device = block->base;
2880
2881         switch (cmd) {
2882         case BIODASDGATTR:
2883                 return dasd_eckd_get_attrib(device, argp);
2884         case BIODASDSATTR:
2885                 return dasd_eckd_set_attrib(device, argp);
2886         case BIODASDPSRD:
2887                 return dasd_eckd_performance(device, argp);
2888         case BIODASDRLSE:
2889                 return dasd_eckd_release(device);
2890         case BIODASDRSRV:
2891                 return dasd_eckd_reserve(device);
2892         case BIODASDSLCK:
2893                 return dasd_eckd_steal_lock(device);
2894         case BIODASDSYMMIO:
2895                 return dasd_symm_io(device, argp);
2896         default:
2897                 return -ENOIOCTLCMD;
2898         }
2899 }
2900
2901 /*
2902  * Dump the range of CCWs into 'page' buffer
2903  * and return number of printed chars.
2904  */
2905 static int
2906 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
2907 {
2908         int len, count;
2909         char *datap;
2910
2911         len = 0;
2912         while (from <= to) {
2913                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2914                                " CCW %p: %08X %08X DAT:",
2915                                from, ((int *) from)[0], ((int *) from)[1]);
2916
2917                 /* get pointer to data (consider IDALs) */
2918                 if (from->flags & CCW_FLAG_IDA)
2919                         datap = (char *) *((addr_t *) (addr_t) from->cda);
2920                 else
2921                         datap = (char *) ((addr_t) from->cda);
2922
2923                 /* dump data (max 32 bytes) */
2924                 for (count = 0; count < from->count && count < 32; count++) {
2925                         if (count % 8 == 0) len += sprintf(page + len, " ");
2926                         if (count % 4 == 0) len += sprintf(page + len, " ");
2927                         len += sprintf(page + len, "%02x", datap[count]);
2928                 }
2929                 len += sprintf(page + len, "\n");
2930                 from++;
2931         }
2932         return len;
2933 }
2934
2935 static void
2936 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
2937                          char *reason)
2938 {
2939         u64 *sense;
2940
2941         sense = (u64 *) dasd_get_sense(irb);
2942         if (sense) {
2943                 DBF_DEV_EVENT(DBF_EMERG, device,
2944                               "%s: %s %02x%02x%02x %016llx %016llx %016llx "
2945                               "%016llx", reason,
2946                               scsw_is_tm(&irb->scsw) ? "t" : "c",
2947                               scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw),
2948                               scsw_dstat(&irb->scsw), sense[0], sense[1],
2949                               sense[2], sense[3]);
2950         } else {
2951                 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
2952                               "SORRY - NO VALID SENSE AVAILABLE\n");
2953         }
2954 }
2955
2956 /*
2957  * Print sense data and related channel program.
2958  * Parts are printed because printk buffer is only 1024 bytes.
2959  */
2960 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
2961                                  struct dasd_ccw_req *req, struct irb *irb)
2962 {
2963         char *page;
2964         struct ccw1 *first, *last, *fail, *from, *to;
2965         int len, sl, sct;
2966
2967         page = (char *) get_zeroed_page(GFP_ATOMIC);
2968         if (page == NULL) {
2969                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2970                               "No memory to dump sense data\n");
2971                 return;
2972         }
2973         /* dump the sense data */
2974         len = sprintf(page,  KERN_ERR PRINTK_HEADER
2975                       " I/O status report for device %s:\n",
2976                       dev_name(&device->cdev->dev));
2977         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2978                        " in req: %p CS: 0x%02X DS: 0x%02X CC: 0x%02X RC: %d\n",
2979                        req, scsw_cstat(&irb->scsw), scsw_dstat(&irb->scsw),
2980                        scsw_cc(&irb->scsw), req->intrc);
2981         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2982                        " device %s: Failing CCW: %p\n",
2983                        dev_name(&device->cdev->dev),
2984                        (void *) (addr_t) irb->scsw.cmd.cpa);
2985         if (irb->esw.esw0.erw.cons) {
2986                 for (sl = 0; sl < 4; sl++) {
2987                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2988                                        " Sense(hex) %2d-%2d:",
2989                                        (8 * sl), ((8 * sl) + 7));
2990
2991                         for (sct = 0; sct < 8; sct++) {
2992                                 len += sprintf(page + len, " %02x",
2993                                                irb->ecw[8 * sl + sct]);
2994                         }
2995                         len += sprintf(page + len, "\n");
2996                 }
2997
2998                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
2999                         /* 24 Byte Sense Data */
3000                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3001                                 " 24 Byte: %x MSG %x, "
3002                                 "%s MSGb to SYSOP\n",
3003                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
3004                                 irb->ecw[1] & 0x10 ? "" : "no");
3005                 } else {
3006                         /* 32 Byte Sense Data */
3007                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3008                                 " 32 Byte: Format: %x "
3009                                 "Exception class %x\n",
3010                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
3011                 }
3012         } else {
3013                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3014                         " SORRY - NO VALID SENSE AVAILABLE\n");
3015         }
3016         printk("%s", page);
3017
3018         if (req) {
3019                 /* req == NULL for unsolicited interrupts */
3020                 /* dump the Channel Program (max 140 Bytes per line) */
3021                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
3022                 first = req->cpaddr;
3023                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
3024                 to = min(first + 6, last);
3025                 len = sprintf(page,  KERN_ERR PRINTK_HEADER
3026                               " Related CP in req: %p\n", req);
3027                 dasd_eckd_dump_ccw_range(first, to, page + len);
3028                 printk("%s", page);
3029
3030                 /* print failing CCW area (maximum 4) */
3031                 /* scsw->cda is either valid or zero  */
3032                 len = 0;
3033                 from = ++to;
3034                 fail = (struct ccw1 *)(addr_t)
3035                                 irb->scsw.cmd.cpa; /* failing CCW */
3036                 if (from <  fail - 2) {
3037                         from = fail - 2;     /* there is a gap - print header */
3038                         len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
3039                 }
3040                 to = min(fail + 1, last);
3041                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
3042
3043                 /* print last CCWs (maximum 2) */
3044                 from = max(from, ++to);
3045                 if (from < last - 1) {
3046                         from = last - 1;     /* there is a gap - print header */
3047                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
3048                 }
3049                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
3050                 if (len > 0)
3051                         printk("%s", page);
3052         }
3053         free_page((unsigned long) page);
3054 }
3055
3056
3057 /*
3058  * Print sense data from a tcw.
3059  */
3060 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
3061                                  struct dasd_ccw_req *req, struct irb *irb)
3062 {
3063         char *page;
3064         int len, sl, sct, residual;
3065
3066         struct tsb *tsb;
3067         u8 *sense;
3068
3069
3070         page = (char *) get_zeroed_page(GFP_ATOMIC);
3071         if (page == NULL) {
3072                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
3073                             "No memory to dump sense data");
3074                 return;
3075         }
3076         /* dump the sense data */
3077         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3078                       " I/O status report for device %s:\n",
3079                       dev_name(&device->cdev->dev));
3080         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3081                        " in req: %p CS: 0x%02X DS: 0x%02X CC: 0x%02X RC: %d "
3082                        "fcxs: 0x%02X schxs: 0x%02X\n", req,
3083                        scsw_cstat(&irb->scsw), scsw_dstat(&irb->scsw),
3084                        scsw_cc(&irb->scsw), req->intrc,
3085                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs);
3086         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3087                        " device %s: Failing TCW: %p\n",
3088                        dev_name(&device->cdev->dev),
3089                        (void *) (addr_t) irb->scsw.tm.tcw);
3090
3091         tsb = NULL;
3092         sense = NULL;
3093         if (irb->scsw.tm.tcw)
3094                 tsb = tcw_get_tsb(
3095                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
3096
3097         if (tsb && (irb->scsw.tm.fcxs == 0x01)) {
3098                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3099                                " tsb->length %d\n", tsb->length);
3100                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3101                                " tsb->flags %x\n", tsb->flags);
3102                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3103                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
3104                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3105                                " tsb->count %d\n", tsb->count);
3106                 residual = tsb->count - 28;
3107                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3108                                " residual %d\n", residual);
3109
3110                 switch (tsb->flags & 0x07) {
3111                 case 1: /* tsa_iostat */
3112                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3113                                " tsb->tsa.iostat.dev_time %d\n",
3114                                        tsb->tsa.iostat.dev_time);
3115                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3116                                " tsb->tsa.iostat.def_time %d\n",
3117                                        tsb->tsa.iostat.def_time);
3118                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3119                                " tsb->tsa.iostat.queue_time %d\n",
3120                                        tsb->tsa.iostat.queue_time);
3121                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3122                                " tsb->tsa.iostat.dev_busy_time %d\n",
3123                                        tsb->tsa.iostat.dev_busy_time);
3124                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3125                                " tsb->tsa.iostat.dev_act_time %d\n",
3126                                        tsb->tsa.iostat.dev_act_time);
3127                         sense = tsb->tsa.iostat.sense;
3128                         break;
3129                 case 2: /* ts_ddpc */
3130                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3131                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
3132                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3133                                " tsb->tsa.ddpc.rcq:  ");
3134                         for (sl = 0; sl < 16; sl++) {
3135                                 for (sct = 0; sct < 8; sct++) {
3136                                         len += sprintf(page + len, " %02x",
3137                                                        tsb->tsa.ddpc.rcq[sl]);
3138                                 }
3139                                 len += sprintf(page + len, "\n");
3140                         }
3141                         sense = tsb->tsa.ddpc.sense;
3142                         break;
3143                 case 3: /* tsa_intrg */
3144                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3145                                       " tsb->tsa.intrg.: not supportet yet \n");
3146                         break;
3147                 }
3148
3149                 if (sense) {
3150                         for (sl = 0; sl < 4; sl++) {
3151                                 len += sprintf(page + len,
3152                                                KERN_ERR PRINTK_HEADER
3153                                                " Sense(hex) %2d-%2d:",
3154                                                (8 * sl), ((8 * sl) + 7));
3155                                 for (sct = 0; sct < 8; sct++) {
3156                                         len += sprintf(page + len, " %02x",
3157                                                        sense[8 * sl + sct]);
3158                                 }
3159                                 len += sprintf(page + len, "\n");
3160                         }
3161
3162                         if (sense[27] & DASD_SENSE_BIT_0) {
3163                                 /* 24 Byte Sense Data */
3164                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3165                                         " 24 Byte: %x MSG %x, "
3166                                         "%s MSGb to SYSOP\n",
3167                                         sense[7] >> 4, sense[7] & 0x0f,
3168                                         sense[1] & 0x10 ? "" : "no");
3169                         } else {
3170                                 /* 32 Byte Sense Data */
3171                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3172                                         " 32 Byte: Format: %x "
3173                                         "Exception class %x\n",
3174                                         sense[6] & 0x0f, sense[22] >> 4);
3175                         }
3176                 } else {
3177                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3178                                 " SORRY - NO VALID SENSE AVAILABLE\n");
3179                 }
3180         } else {
3181                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3182                         " SORRY - NO TSB DATA AVAILABLE\n");
3183         }
3184         printk("%s", page);
3185         free_page((unsigned long) page);
3186 }
3187
3188 static void dasd_eckd_dump_sense(struct dasd_device *device,
3189                                  struct dasd_ccw_req *req, struct irb *irb)
3190 {
3191         if (req && scsw_is_tm(&req->irb.scsw))
3192                 dasd_eckd_dump_sense_tcw(device, req, irb);
3193         else
3194                 dasd_eckd_dump_sense_ccw(device, req, irb);
3195 }
3196
3197 int dasd_eckd_pm_freeze(struct dasd_device *device)
3198 {
3199         /*
3200          * the device should be disconnected from our LCU structure
3201          * on restore we will reconnect it and reread LCU specific
3202          * information like PAV support that might have changed
3203          */
3204         dasd_alias_remove_device(device);
3205         dasd_alias_disconnect_device_from_lcu(device);
3206
3207         return 0;
3208 }
3209
3210 int dasd_eckd_restore_device(struct dasd_device *device)
3211 {
3212         struct dasd_eckd_private *private;
3213         int is_known, rc;
3214         struct dasd_uid temp_uid;
3215
3216         private = (struct dasd_eckd_private *) device->private;
3217
3218         /* Read Configuration Data */
3219         rc = dasd_eckd_read_conf(device);
3220         if (rc)
3221                 goto out_err;
3222
3223         /* Generate device unique id and register in devmap */
3224         rc = dasd_eckd_generate_uid(device, &private->uid);
3225         dasd_get_uid(device->cdev, &temp_uid);
3226         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
3227                 dev_err(&device->cdev->dev, "The UID of the DASD has changed\n");
3228         if (rc)
3229                 goto out_err;
3230         dasd_set_uid(device->cdev, &private->uid);
3231
3232         /* register lcu with alias handling, enable PAV if this is a new lcu */
3233         is_known = dasd_alias_make_device_known_to_lcu(device);
3234         if (is_known < 0)
3235                 return is_known;
3236         if (!is_known) {
3237                 /* new lcu found */
3238                 rc = dasd_eckd_validate_server(device); /* will switch pav on */
3239                 if (rc)
3240                         goto out_err;
3241         }
3242
3243         /* Read Feature Codes */
3244         rc = dasd_eckd_read_features(device);
3245         if (rc)
3246                 goto out_err;
3247
3248         /* Read Device Characteristics */
3249         memset(&private->rdc_data, 0, sizeof(private->rdc_data));
3250         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
3251                                          &private->rdc_data, 64);
3252         if (rc) {
3253                 DBF_EVENT(DBF_WARNING,
3254                           "Read device characteristics failed, rc=%d for "
3255                           "device: %s", rc, dev_name(&device->cdev->dev));
3256                 goto out_err;
3257         }
3258
3259         /* add device to alias management */
3260         dasd_alias_add_device(device);
3261
3262         return 0;
3263
3264 out_err:
3265         return -1;
3266 }
3267
3268 static struct ccw_driver dasd_eckd_driver = {
3269         .name        = "dasd-eckd",
3270         .owner       = THIS_MODULE,
3271         .ids         = dasd_eckd_ids,
3272         .probe       = dasd_eckd_probe,
3273         .remove      = dasd_generic_remove,
3274         .set_offline = dasd_generic_set_offline,
3275         .set_online  = dasd_eckd_set_online,
3276         .notify      = dasd_generic_notify,
3277         .freeze      = dasd_generic_pm_freeze,
3278         .thaw        = dasd_generic_restore_device,
3279         .restore     = dasd_generic_restore_device,
3280 };
3281
3282 /*
3283  * max_blocks is dependent on the amount of storage that is available
3284  * in the static io buffer for each device. Currently each device has
3285  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
3286  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
3287  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
3288  * addition we have one define extent ccw + 16 bytes of data and one
3289  * locate record ccw + 16 bytes of data. That makes:
3290  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
3291  * We want to fit two into the available memory so that we can immediately
3292  * start the next request if one finishes off. That makes 249.5 blocks
3293  * for one request. Give a little safety and the result is 240.
3294  */
3295 static struct dasd_discipline dasd_eckd_discipline = {
3296         .owner = THIS_MODULE,
3297         .name = "ECKD",
3298         .ebcname = "ECKD",
3299         .max_blocks = 240,
3300         .check_device = dasd_eckd_check_characteristics,
3301         .uncheck_device = dasd_eckd_uncheck_device,
3302         .do_analysis = dasd_eckd_do_analysis,
3303         .ready_to_online = dasd_eckd_ready_to_online,
3304         .online_to_ready = dasd_eckd_online_to_ready,
3305         .fill_geometry = dasd_eckd_fill_geometry,
3306         .start_IO = dasd_start_IO,
3307         .term_IO = dasd_term_IO,
3308         .handle_terminated_request = dasd_eckd_handle_terminated_request,
3309         .format_device = dasd_eckd_format_device,
3310         .erp_action = dasd_eckd_erp_action,
3311         .erp_postaction = dasd_eckd_erp_postaction,
3312         .handle_unsolicited_interrupt = dasd_eckd_handle_unsolicited_interrupt,
3313         .build_cp = dasd_eckd_build_alias_cp,
3314         .free_cp = dasd_eckd_free_alias_cp,
3315         .dump_sense = dasd_eckd_dump_sense,
3316         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
3317         .fill_info = dasd_eckd_fill_info,
3318         .ioctl = dasd_eckd_ioctl,
3319         .freeze = dasd_eckd_pm_freeze,
3320         .restore = dasd_eckd_restore_device,
3321 };
3322
3323 static int __init
3324 dasd_eckd_init(void)
3325 {
3326         int ret;
3327
3328         ASCEBC(dasd_eckd_discipline.ebcname, 4);
3329         ret = ccw_driver_register(&dasd_eckd_driver);
3330         if (!ret)
3331                 wait_for_device_probe();
3332
3333         return ret;
3334 }
3335
3336 static void __exit
3337 dasd_eckd_cleanup(void)
3338 {
3339         ccw_driver_unregister(&dasd_eckd_driver);
3340 }
3341
3342 module_init(dasd_eckd_init);
3343 module_exit(dasd_eckd_cleanup);