drivers/s390/block/dasd_eckd.c

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_eckd.c
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5  *                  Carsten Otte <Cotte@de.ibm.com>
   6  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  * Bugreports.to..: <Linux390@de.ibm.com>
   8  * Copyright IBM Corp. 1999, 2009
   9  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
  10  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
  11  */
  12
  13 #define KMSG_COMPONENT "dasd"
  14
  15 #include <linux/stddef.h>
  16 #include <linux/kernel.h>
  17 #include <linux/slab.h>
  18 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  19 #include <linux/bio.h>
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22
  23 #include <asm/debug.h>
  24 #include <asm/idals.h>
  25 #include <asm/ebcdic.h>
  26 #include <asm/io.h>
  27 #include <asm/todclk.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/cio.h>
  30 #include <asm/ccwdev.h>
  31 #include <asm/itcw.h>
  32
  33 #include "dasd_int.h"
  34 #include "dasd_eckd.h"
  35 #include "../cio/chsc.h"
  36
  37
  38 #ifdef PRINTK_HEADER
  39 #undef PRINTK_HEADER
  40 #endif                          /* PRINTK_HEADER */
  41 #define PRINTK_HEADER "dasd(eckd):"
  42
  43 #define ECKD_C0(i) (i->home_bytes)
  44 #define ECKD_F(i) (i->formula)
  45 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
  46                     (i->factors.f_0x02.f1))
  47 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
  48                     (i->factors.f_0x02.f2))
  49 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
  50                     (i->factors.f_0x02.f3))
  51 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
  52 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
  53 #define ECKD_F6(i) (i->factor6)
  54 #define ECKD_F7(i) (i->factor7)
  55 #define ECKD_F8(i) (i->factor8)
  56
  57 MODULE_LICENSE("GPL");
  58
  59 static struct dasd_discipline dasd_eckd_discipline;
  60
  61 /* The ccw bus type uses this table to find devices that it sends to
  62  * dasd_eckd_probe */
  63 static struct ccw_device_id dasd_eckd_ids[] = {
  64         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
  65         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
  66         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3390, 0), .driver_info = 0x3},
  67         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
  68         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
  69         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
  70         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
  71         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
  72         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
  73         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
  74         { /* end of list */ },
  75 };
  76
  77 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  78
  79 static struct ccw_driver dasd_eckd_driver; /* see below */
  80
  81 /* initial attempt at a probe function. this can be simplified once
  82  * the other detection code is gone */
  83 static int
  84 dasd_eckd_probe (struct ccw_device *cdev)
  85 {
  86         int ret;
  87
  88         /* set ECKD specific ccw-device options */
  89         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE);
  90         if (ret) {
  91                 DBF_EVENT(DBF_WARNING,
  92                        "dasd_eckd_probe: could not set ccw-device options "
  93                        "for %s\n", dev_name(&cdev->dev));
  94                 return ret;
  95         }
  96         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
  97         return ret;
  98 }
  99
 100 static int
 101 dasd_eckd_set_online(struct ccw_device *cdev)
 102 {
 103         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
 104 }
 105
 106 static const int sizes_trk0[] = { 28, 148, 84 };
 107 #define LABEL_SIZE 140
 108
 109 static inline unsigned int
 110 round_up_multiple(unsigned int no, unsigned int mult)
 111 {
 112         int rem = no % mult;
 113         return (rem ? no - rem + mult : no);
 114 }
 115
 116 static inline unsigned int
 117 ceil_quot(unsigned int d1, unsigned int d2)
 118 {
 119         return (d1 + (d2 - 1)) / d2;
 120 }
 121
 122 static unsigned int
 123 recs_per_track(struct dasd_eckd_characteristics * rdc,
 124                unsigned int kl, unsigned int dl)
 125 {
 126         int dn, kn;
 127
 128         switch (rdc->dev_type) {
 129         case 0x3380:
 130                 if (kl)
 131                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 132                                        ceil_quot(dl + 12, 32));
 133                 else
 134                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 135         case 0x3390:
 136                 dn = ceil_quot(dl + 6, 232) + 1;
 137                 if (kl) {
 138                         kn = ceil_quot(kl + 6, 232) + 1;
 139                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 140                                        9 + ceil_quot(dl + 6 * dn, 34));
 141                 } else
 142                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 143         case 0x9345:
 144                 dn = ceil_quot(dl + 6, 232) + 1;
 145                 if (kl) {
 146                         kn = ceil_quot(kl + 6, 232) + 1;
 147                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 148                                        ceil_quot(dl + 6 * dn, 34));
 149                 } else
 150                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 151         }
 152         return 0;
 153 }
 154
 155 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
 156 {
 157         geo->cyl = (__u16) cyl;
 158         geo->head = cyl >> 16;
 159         geo->head <<= 4;
 160         geo->head |= head;
 161 }
 162
 163 static int
 164 check_XRC (struct ccw1         *de_ccw,
 165            struct DE_eckd_data *data,
 166            struct dasd_device  *device)
 167 {
 168         struct dasd_eckd_private *private;
 169         int rc;
 170
 171         private = (struct dasd_eckd_private *) device->private;
 172         if (!private->rdc_data.facilities.XRC_supported)
 173                 return 0;
 174
 175         /* switch on System Time Stamp - needed for XRC Support */
 176         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 177         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 178
 179         rc = get_sync_clock(&data->ep_sys_time);
 180         /* Ignore return code if sync clock is switched off. */
 181         if (rc == -ENOSYS || rc == -EACCES)
 182                 rc = 0;
 183
 184         de_ccw->count = sizeof(struct DE_eckd_data);
 185         de_ccw->flags |= CCW_FLAG_SLI;
 186         return rc;
 187 }
 188
 189 static int
 190 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
 191               unsigned int totrk, int cmd, struct dasd_device *device)
 192 {
 193         struct dasd_eckd_private *private;
 194         u32 begcyl, endcyl;
 195         u16 heads, beghead, endhead;
 196         int rc = 0;
 197
 198         private = (struct dasd_eckd_private *) device->private;
 199
 200         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 201         ccw->flags = 0;
 202         ccw->count = 16;
 203         ccw->cda = (__u32) __pa(data);
 204
 205         memset(data, 0, sizeof(struct DE_eckd_data));
 206         switch (cmd) {
 207         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 208         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 209         case DASD_ECKD_CCW_READ:
 210         case DASD_ECKD_CCW_READ_MT:
 211         case DASD_ECKD_CCW_READ_CKD:
 212         case DASD_ECKD_CCW_READ_CKD_MT:
 213         case DASD_ECKD_CCW_READ_KD:
 214         case DASD_ECKD_CCW_READ_KD_MT:
 215         case DASD_ECKD_CCW_READ_COUNT:
 216                 data->mask.perm = 0x1;
 217                 data->attributes.operation = private->attrib.operation;
 218                 break;
 219         case DASD_ECKD_CCW_WRITE:
 220         case DASD_ECKD_CCW_WRITE_MT:
 221         case DASD_ECKD_CCW_WRITE_KD:
 222         case DASD_ECKD_CCW_WRITE_KD_MT:
 223                 data->mask.perm = 0x02;
 224                 data->attributes.operation = private->attrib.operation;
 225                 rc = check_XRC (ccw, data, device);
 226                 break;
 227         case DASD_ECKD_CCW_WRITE_CKD:
 228         case DASD_ECKD_CCW_WRITE_CKD_MT:
 229                 data->attributes.operation = DASD_BYPASS_CACHE;
 230                 rc = check_XRC (ccw, data, device);
 231                 break;
 232         case DASD_ECKD_CCW_ERASE:
 233         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 234         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 235                 data->mask.perm = 0x3;
 236                 data->mask.auth = 0x1;
 237                 data->attributes.operation = DASD_BYPASS_CACHE;
 238                 rc = check_XRC (ccw, data, device);
 239                 break;
 240         default:
 241                 dev_err(&device->cdev->dev,
 242                         "0x%x is not a known command\n", cmd);
 243                 break;
 244         }
 245
 246         data->attributes.mode = 0x3;    /* ECKD */
 247
 248         if ((private->rdc_data.cu_type == 0x2105 ||
 249              private->rdc_data.cu_type == 0x2107 ||
 250              private->rdc_data.cu_type == 0x1750)
 251             && !(private->uses_cdl && trk < 2))
 252                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 253
 254         heads = private->rdc_data.trk_per_cyl;
 255         begcyl = trk / heads;
 256         beghead = trk % heads;
 257         endcyl = totrk / heads;
 258         endhead = totrk % heads;
 259
 260         /* check for sequential prestage - enhance cylinder range */
 261         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 262             data->attributes.operation == DASD_SEQ_ACCESS) {
 263
 264                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
 265                         endcyl += private->attrib.nr_cyl;
 266                 else
 267                         endcyl = (private->real_cyl - 1);
 268         }
 269
 270         set_ch_t(&data->beg_ext, begcyl, beghead);
 271         set_ch_t(&data->end_ext, endcyl, endhead);
 272         return rc;
 273 }
 274
 275 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
 276                                struct dasd_device  *device)
 277 {
 278         struct dasd_eckd_private *private;
 279         int rc;
 280
 281         private = (struct dasd_eckd_private *) device->private;
 282         if (!private->rdc_data.facilities.XRC_supported)
 283                 return 0;
 284
 285         /* switch on System Time Stamp - needed for XRC Support */
 286         pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid'   */
 287         pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
 288         pfxdata->validity.time_stamp = 1;           /* 'Time Stamp Valid'   */
 289
 290         rc = get_sync_clock(&pfxdata->define_extent.ep_sys_time);
 291         /* Ignore return code if sync clock is switched off. */
 292         if (rc == -ENOSYS || rc == -EACCES)
 293                 rc = 0;
 294         return rc;
 295 }
 296
 297 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
 298                           unsigned int rec_on_trk, int count, int cmd,
 299                           struct dasd_device *device, unsigned int reclen,
 300                           unsigned int tlf)
 301 {
 302         struct dasd_eckd_private *private;
 303         int sector;
 304         int dn, d;
 305
 306         private = (struct dasd_eckd_private *) device->private;
 307
 308         memset(data, 0, sizeof(*data));
 309         sector = 0;
 310         if (rec_on_trk) {
 311                 switch (private->rdc_data.dev_type) {
 312                 case 0x3390:
 313                         dn = ceil_quot(reclen + 6, 232);
 314                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 315                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 316                         break;
 317                 case 0x3380:
 318                         d = 7 + ceil_quot(reclen + 12, 32);
 319                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 320                         break;
 321                 }
 322         }
 323         data->sector = sector;
 324         /* note: meaning of count depends on the operation
 325          *       for record based I/O it's the number of records, but for
 326          *       track based I/O it's the number of tracks
 327          */
 328         data->count = count;
 329         switch (cmd) {
 330         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 331                 data->operation.orientation = 0x3;
 332                 data->operation.operation = 0x03;
 333                 break;
 334         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 335                 data->operation.orientation = 0x3;
 336                 data->operation.operation = 0x16;
 337                 break;
 338         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 339                 data->operation.orientation = 0x1;
 340                 data->operation.operation = 0x03;
 341                 data->count++;
 342                 break;
 343         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 344                 data->operation.orientation = 0x3;
 345                 data->operation.operation = 0x16;
 346                 data->count++;
 347                 break;
 348         case DASD_ECKD_CCW_WRITE:
 349         case DASD_ECKD_CCW_WRITE_MT:
 350         case DASD_ECKD_CCW_WRITE_KD:
 351         case DASD_ECKD_CCW_WRITE_KD_MT:
 352                 data->auxiliary.length_valid = 0x1;
 353                 data->length = reclen;
 354                 data->operation.operation = 0x01;
 355                 break;
 356         case DASD_ECKD_CCW_WRITE_CKD:
 357         case DASD_ECKD_CCW_WRITE_CKD_MT:
 358                 data->auxiliary.length_valid = 0x1;
 359                 data->length = reclen;
 360                 data->operation.operation = 0x03;
 361                 break;
 362         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 363                 data->auxiliary.length_valid = 0x1;
 364                 data->length = reclen;  /* not tlf, as one might think */
 365                 data->operation.operation = 0x3F;
 366                 data->extended_operation = 0x23;
 367                 break;
 368         case DASD_ECKD_CCW_READ:
 369         case DASD_ECKD_CCW_READ_MT:
 370         case DASD_ECKD_CCW_READ_KD:
 371         case DASD_ECKD_CCW_READ_KD_MT:
 372                 data->auxiliary.length_valid = 0x1;
 373                 data->length = reclen;
 374                 data->operation.operation = 0x06;
 375                 break;
 376         case DASD_ECKD_CCW_READ_CKD:
 377         case DASD_ECKD_CCW_READ_CKD_MT:
 378                 data->auxiliary.length_valid = 0x1;
 379                 data->length = reclen;
 380                 data->operation.operation = 0x16;
 381                 break;
 382         case DASD_ECKD_CCW_READ_COUNT:
 383                 data->operation.operation = 0x06;
 384                 break;
 385         case DASD_ECKD_CCW_READ_TRACK_DATA:
 386                 data->auxiliary.length_valid = 0x1;
 387                 data->length = tlf;
 388                 data->operation.operation = 0x0C;
 389                 break;
 390         case DASD_ECKD_CCW_ERASE:
 391                 data->length = reclen;
 392                 data->auxiliary.length_valid = 0x1;
 393                 data->operation.operation = 0x0b;
 394                 break;
 395         default:
 396                 DBF_DEV_EVENT(DBF_ERR, device,
 397                             "fill LRE unknown opcode 0x%x", cmd);
 398                 BUG();
 399         }
 400         set_ch_t(&data->seek_addr,
 401                  trk / private->rdc_data.trk_per_cyl,
 402                  trk % private->rdc_data.trk_per_cyl);
 403         data->search_arg.cyl = data->seek_addr.cyl;
 404         data->search_arg.head = data->seek_addr.head;
 405         data->search_arg.record = rec_on_trk;
 406 }
 407
 408 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 409                       unsigned int trk, unsigned int totrk, int cmd,
 410                       struct dasd_device *basedev, struct dasd_device *startdev,
 411                       unsigned char format, unsigned int rec_on_trk, int count,
 412                       unsigned int blksize, unsigned int tlf)
 413 {
 414         struct dasd_eckd_private *basepriv, *startpriv;
 415         struct DE_eckd_data *dedata;
 416         struct LRE_eckd_data *lredata;
 417         u32 begcyl, endcyl;
 418         u16 heads, beghead, endhead;
 419         int rc = 0;
 420
 421         basepriv = (struct dasd_eckd_private *) basedev->private;
 422         startpriv = (struct dasd_eckd_private *) startdev->private;
 423         dedata = &pfxdata->define_extent;
 424         lredata = &pfxdata->locate_record;
 425
 426         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 427         ccw->flags = 0;
 428         ccw->count = sizeof(*pfxdata);
 429         ccw->cda = (__u32) __pa(pfxdata);
 430
 431         memset(pfxdata, 0, sizeof(*pfxdata));
 432         /* prefix data */
 433         if (format > 1) {
 434                 DBF_DEV_EVENT(DBF_ERR, basedev,
 435                               "PFX LRE unknown format 0x%x", format);
 436                 BUG();
 437                 return -EINVAL;
 438         }
 439         pfxdata->format = format;
 440         pfxdata->base_address = basepriv->ned->unit_addr;
 441         pfxdata->base_lss = basepriv->ned->ID;
 442         pfxdata->validity.define_extent = 1;
 443
 444         /* private uid is kept up to date, conf_data may be outdated */
 445         if (startpriv->uid.type != UA_BASE_DEVICE) {
 446                 pfxdata->validity.verify_base = 1;
 447                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
 448                         pfxdata->validity.hyper_pav = 1;
 449         }
 450
 451         /* define extend data (mostly)*/
 452         switch (cmd) {
 453         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 454         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 455         case DASD_ECKD_CCW_READ:
 456         case DASD_ECKD_CCW_READ_MT:
 457         case DASD_ECKD_CCW_READ_CKD:
 458         case DASD_ECKD_CCW_READ_CKD_MT:
 459         case DASD_ECKD_CCW_READ_KD:
 460         case DASD_ECKD_CCW_READ_KD_MT:
 461         case DASD_ECKD_CCW_READ_COUNT:
 462                 dedata->mask.perm = 0x1;
 463                 dedata->attributes.operation = basepriv->attrib.operation;
 464                 break;
 465         case DASD_ECKD_CCW_READ_TRACK_DATA:
 466                 dedata->mask.perm = 0x1;
 467                 dedata->attributes.operation = basepriv->attrib.operation;
 468                 dedata->blk_size = 0;
 469                 break;
 470         case DASD_ECKD_CCW_WRITE:
 471         case DASD_ECKD_CCW_WRITE_MT:
 472         case DASD_ECKD_CCW_WRITE_KD:
 473         case DASD_ECKD_CCW_WRITE_KD_MT:
 474                 dedata->mask.perm = 0x02;
 475                 dedata->attributes.operation = basepriv->attrib.operation;
 476                 rc = check_XRC_on_prefix(pfxdata, basedev);
 477                 break;
 478         case DASD_ECKD_CCW_WRITE_CKD:
 479         case DASD_ECKD_CCW_WRITE_CKD_MT:
 480                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 481                 rc = check_XRC_on_prefix(pfxdata, basedev);
 482                 break;
 483         case DASD_ECKD_CCW_ERASE:
 484         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 485         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 486                 dedata->mask.perm = 0x3;
 487                 dedata->mask.auth = 0x1;
 488                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 489                 rc = check_XRC_on_prefix(pfxdata, basedev);
 490                 break;
 491         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 492                 dedata->mask.perm = 0x02;
 493                 dedata->attributes.operation = basepriv->attrib.operation;
 494                 dedata->blk_size = blksize;
 495                 rc = check_XRC_on_prefix(pfxdata, basedev);
 496                 break;
 497         default:
 498                 DBF_DEV_EVENT(DBF_ERR, basedev,
 499                             "PFX LRE unknown opcode 0x%x", cmd);
 500                 BUG();
 501                 return -EINVAL;
 502         }
 503
 504         dedata->attributes.mode = 0x3;  /* ECKD */
 505
 506         if ((basepriv->rdc_data.cu_type == 0x2105 ||
 507              basepriv->rdc_data.cu_type == 0x2107 ||
 508              basepriv->rdc_data.cu_type == 0x1750)
 509             && !(basepriv->uses_cdl && trk < 2))
 510                 dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
 511
 512         heads = basepriv->rdc_data.trk_per_cyl;
 513         begcyl = trk / heads;
 514         beghead = trk % heads;
 515         endcyl = totrk / heads;
 516         endhead = totrk % heads;
 517
 518         /* check for sequential prestage - enhance cylinder range */
 519         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
 520             dedata->attributes.operation == DASD_SEQ_ACCESS) {
 521
 522                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
 523                         endcyl += basepriv->attrib.nr_cyl;
 524                 else
 525                         endcyl = (basepriv->real_cyl - 1);
 526         }
 527
 528         set_ch_t(&dedata->beg_ext, begcyl, beghead);
 529         set_ch_t(&dedata->end_ext, endcyl, endhead);
 530
 531         if (format == 1) {
 532                 fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
 533                               basedev, blksize, tlf);
 534         }
 535
 536         return rc;
 537 }
 538
 539 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 540                   unsigned int trk, unsigned int totrk, int cmd,
 541                   struct dasd_device *basedev, struct dasd_device *startdev)
 542 {
 543         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
 544                           0, 0, 0, 0, 0);
 545 }
 546
 547 static void
 548 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
 549               unsigned int rec_on_trk, int no_rec, int cmd,
 550               struct dasd_device * device, int reclen)
 551 {
 552         struct dasd_eckd_private *private;
 553         int sector;
 554         int dn, d;
 555
 556         private = (struct dasd_eckd_private *) device->private;
 557
 558         DBF_DEV_EVENT(DBF_INFO, device,
 559                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 560                   trk, rec_on_trk, no_rec, cmd, reclen);
 561
 562         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 563         ccw->flags = 0;
 564         ccw->count = 16;
 565         ccw->cda = (__u32) __pa(data);
 566
 567         memset(data, 0, sizeof(struct LO_eckd_data));
 568         sector = 0;
 569         if (rec_on_trk) {
 570                 switch (private->rdc_data.dev_type) {
 571                 case 0x3390:
 572                         dn = ceil_quot(reclen + 6, 232);
 573                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 574                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 575                         break;
 576                 case 0x3380:
 577                         d = 7 + ceil_quot(reclen + 12, 32);
 578                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 579                         break;
 580                 }
 581         }
 582         data->sector = sector;
 583         data->count = no_rec;
 584         switch (cmd) {
 585         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 586                 data->operation.orientation = 0x3;
 587                 data->operation.operation = 0x03;
 588                 break;
 589         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 590                 data->operation.orientation = 0x3;
 591                 data->operation.operation = 0x16;
 592                 break;
 593         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 594                 data->operation.orientation = 0x1;
 595                 data->operation.operation = 0x03;
 596                 data->count++;
 597                 break;
 598         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 599                 data->operation.orientation = 0x3;
 600                 data->operation.operation = 0x16;
 601                 data->count++;
 602                 break;
 603         case DASD_ECKD_CCW_WRITE:
 604         case DASD_ECKD_CCW_WRITE_MT:
 605         case DASD_ECKD_CCW_WRITE_KD:
 606         case DASD_ECKD_CCW_WRITE_KD_MT:
 607                 data->auxiliary.last_bytes_used = 0x1;
 608                 data->length = reclen;
 609                 data->operation.operation = 0x01;
 610                 break;
 611         case DASD_ECKD_CCW_WRITE_CKD:
 612         case DASD_ECKD_CCW_WRITE_CKD_MT:
 613                 data->auxiliary.last_bytes_used = 0x1;
 614                 data->length = reclen;
 615                 data->operation.operation = 0x03;
 616                 break;
 617         case DASD_ECKD_CCW_READ:
 618         case DASD_ECKD_CCW_READ_MT:
 619         case DASD_ECKD_CCW_READ_KD:
 620         case DASD_ECKD_CCW_READ_KD_MT:
 621                 data->auxiliary.last_bytes_used = 0x1;
 622                 data->length = reclen;
 623                 data->operation.operation = 0x06;
 624                 break;
 625         case DASD_ECKD_CCW_READ_CKD:
 626         case DASD_ECKD_CCW_READ_CKD_MT:
 627                 data->auxiliary.last_bytes_used = 0x1;
 628                 data->length = reclen;
 629                 data->operation.operation = 0x16;
 630                 break;
 631         case DASD_ECKD_CCW_READ_COUNT:
 632                 data->operation.operation = 0x06;
 633                 break;
 634         case DASD_ECKD_CCW_ERASE:
 635                 data->length = reclen;
 636                 data->auxiliary.last_bytes_used = 0x1;
 637                 data->operation.operation = 0x0b;
 638                 break;
 639         default:
 640                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
 641                               "opcode 0x%x", cmd);
 642         }
 643         set_ch_t(&data->seek_addr,
 644                  trk / private->rdc_data.trk_per_cyl,
 645                  trk % private->rdc_data.trk_per_cyl);
 646         data->search_arg.cyl = data->seek_addr.cyl;
 647         data->search_arg.head = data->seek_addr.head;
 648         data->search_arg.record = rec_on_trk;
 649 }
 650
 651 /*
 652  * Returns 1 if the block is one of the special blocks that needs
 653  * to get read/written with the KD variant of the command.
 654  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 655  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 656  * Luckily the KD variants differ only by one bit (0x08) from the
 657  * normal variant. So don't wonder about code like:
 658  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 659  *         ccw->cmd_code |= 0x8;
 660  */
 661 static inline int
 662 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 663 {
 664         if (recid < 3)
 665                 return 1;
 666         if (recid < blk_per_trk)
 667                 return 0;
 668         if (recid < 2 * blk_per_trk)
 669                 return 1;
 670         return 0;
 671 }
 672
 673 /*
 674  * Returns the record size for the special blocks of the cdl format.
 675  * Only returns something useful if dasd_eckd_cdl_special is true
 676  * for the recid.
 677  */
 678 static inline int
 679 dasd_eckd_cdl_reclen(int recid)
 680 {
 681         if (recid < 3)
 682                 return sizes_trk0[recid];
 683         return LABEL_SIZE;
 684 }
 685
 686 /*
 687  * Generate device unique id that specifies the physical device.
 688  */
 689 static int dasd_eckd_generate_uid(struct dasd_device *device,
 690                                   struct dasd_uid *uid)
 691 {
 692         struct dasd_eckd_private *private;
 693         int count;
 694
 695         private = (struct dasd_eckd_private *) device->private;
 696         if (!private)
 697                 return -ENODEV;
 698         if (!private->ned || !private->gneq)
 699                 return -ENODEV;
 700
 701         memset(uid, 0, sizeof(struct dasd_uid));
 702         memcpy(uid->vendor, private->ned->HDA_manufacturer,
 703                sizeof(uid->vendor) - 1);
 704         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 705         memcpy(uid->serial, private->ned->HDA_location,
 706                sizeof(uid->serial) - 1);
 707         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 708         uid->ssid = private->gneq->subsystemID;
 709         uid->real_unit_addr = private->ned->unit_addr;;
 710         if (private->sneq) {
 711                 uid->type = private->sneq->sua_flags;
 712                 if (uid->type == UA_BASE_PAV_ALIAS)
 713                         uid->base_unit_addr = private->sneq->base_unit_addr;
 714         } else {
 715                 uid->type = UA_BASE_DEVICE;
 716         }
 717         if (private->vdsneq) {
 718                 for (count = 0; count < 16; count++) {
 719                         sprintf(uid->vduit+2*count, "%02x",
 720                                 private->vdsneq->uit[count]);
 721                 }
 722         }
 723         return 0;
 724 }
 725
 726 static struct dasd_ccw_req *dasd_eckd_build_rcd_lpm(struct dasd_device *device,
 727                                                     void *rcd_buffer,
 728                                                     struct ciw *ciw, __u8 lpm)
 729 {
 730         struct dasd_ccw_req *cqr;
 731         struct ccw1 *ccw;
 732
 733         cqr = dasd_smalloc_request("ECKD", 1 /* RCD */, ciw->count, device);
 734
 735         if (IS_ERR(cqr)) {
 736                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 737                               "Could not allocate RCD request");
 738                 return cqr;
 739         }
 740
 741         ccw = cqr->cpaddr;
 742         ccw->cmd_code = ciw->cmd;
 743         ccw->cda = (__u32)(addr_t)rcd_buffer;
 744         ccw->count = ciw->count;
 745
 746         cqr->startdev = device;
 747         cqr->memdev = device;
 748         cqr->block = NULL;
 749         cqr->expires = 10*HZ;
 750         cqr->lpm = lpm;
 751         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 752         cqr->retries = 2;
 753         cqr->buildclk = get_clock();
 754         cqr->status = DASD_CQR_FILLED;
 755         return cqr;
 756 }
 757
 758 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 759                                    void **rcd_buffer,
 760                                    int *rcd_buffer_size, __u8 lpm)
 761 {
 762         struct ciw *ciw;
 763         char *rcd_buf = NULL;
 764         int ret;
 765         struct dasd_ccw_req *cqr;
 766
 767         /*
 768          * scan for RCD command in extended SenseID data
 769          */
 770         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 771         if (!ciw || ciw->cmd == 0) {
 772                 ret = -EOPNOTSUPP;
 773                 goto out_error;
 774         }
 775         rcd_buf = kzalloc(ciw->count, GFP_KERNEL | GFP_DMA);
 776         if (!rcd_buf) {
 777                 ret = -ENOMEM;
 778                 goto out_error;
 779         }
 780
 781         /*
 782          * buffer has to start with EBCDIC "V1.0" to show
 783          * support for virtual device SNEQ
 784          */
 785         rcd_buf[0] = 0xE5;
 786         rcd_buf[1] = 0xF1;
 787         rcd_buf[2] = 0x4B;
 788         rcd_buf[3] = 0xF0;
 789         cqr = dasd_eckd_build_rcd_lpm(device, rcd_buf, ciw, lpm);
 790         if (IS_ERR(cqr)) {
 791                 ret =  PTR_ERR(cqr);
 792                 goto out_error;
 793         }
 794         ret = dasd_sleep_on(cqr);
 795         /*
 796          * on success we update the user input parms
 797          */
 798         dasd_sfree_request(cqr, cqr->memdev);
 799         if (ret)
 800                 goto out_error;
 801
 802         *rcd_buffer_size = ciw->count;
 803         *rcd_buffer = rcd_buf;
 804         return 0;
 805 out_error:
 806         kfree(rcd_buf);
 807         *rcd_buffer = NULL;
 808         *rcd_buffer_size = 0;
 809         return ret;
 810 }
 811
 812 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
 813 {
 814
 815         struct dasd_sneq *sneq;
 816         int i, count;
 817
 818         private->ned = NULL;
 819         private->sneq = NULL;
 820         private->vdsneq = NULL;
 821         private->gneq = NULL;
 822         count = private->conf_len / sizeof(struct dasd_sneq);
 823         sneq = (struct dasd_sneq *)private->conf_data;
 824         for (i = 0; i < count; ++i) {
 825                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 826                         private->sneq = sneq;
 827                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 828                         private->vdsneq = (struct vd_sneq *)sneq;
 829                 else if (sneq->flags.identifier == 2)
 830                         private->gneq = (struct dasd_gneq *)sneq;
 831                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 832                         private->ned = (struct dasd_ned *)sneq;
 833                 sneq++;
 834         }
 835         if (!private->ned || !private->gneq) {
 836                 private->ned = NULL;
 837                 private->sneq = NULL;
 838                 private->vdsneq = NULL;
 839                 private->gneq = NULL;
 840                 return -EINVAL;
 841         }
 842         return 0;
 843
 844 };
 845
 846 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
 847 {
 848         struct dasd_gneq *gneq;
 849         int i, count, found;
 850
 851         count = conf_len / sizeof(*gneq);
 852         gneq = (struct dasd_gneq *)conf_data;
 853         found = 0;
 854         for (i = 0; i < count; ++i) {
 855                 if (gneq->flags.identifier == 2) {
 856                         found = 1;
 857                         break;
 858                 }
 859                 gneq++;
 860         }
 861         if (found)
 862                 return ((char *)gneq)[18] & 0x07;
 863         else
 864                 return 0;
 865 }
 866
 867 static int dasd_eckd_read_conf(struct dasd_device *device)
 868 {
 869         void *conf_data;
 870         int conf_len, conf_data_saved;
 871         int rc;
 872         __u8 lpm;
 873         struct dasd_eckd_private *private;
 874         struct dasd_eckd_path *path_data;
 875
 876         private = (struct dasd_eckd_private *) device->private;
 877         path_data = (struct dasd_eckd_path *) &private->path_data;
 878         path_data->opm = ccw_device_get_path_mask(device->cdev);
 879         lpm = 0x80;
 880         conf_data_saved = 0;
 881         /* get configuration data per operational path */
 882         for (lpm = 0x80; lpm; lpm>>= 1) {
 883                 if (lpm & path_data->opm){
 884                         rc = dasd_eckd_read_conf_lpm(device, &conf_data,
 885                                                      &conf_len, lpm);
 886                         if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
 887                                 DBF_EVENT(DBF_WARNING,
 888                                           "Read configuration data returned "
 889                                           "error %d for device: %s", rc,
 890                                           dev_name(&device->cdev->dev));
 891                                 return rc;
 892                         }
 893                         if (conf_data == NULL) {
 894                                 DBF_EVENT(DBF_WARNING, "No configuration "
 895                                           "data retrieved for device: %s",
 896                                           dev_name(&device->cdev->dev));
 897                                 continue;       /* no error */
 898                         }
 899                         /* save first valid configuration data */
 900                         if (!conf_data_saved) {
 901                                 kfree(private->conf_data);
 902                                 private->conf_data = conf_data;
 903                                 private->conf_len = conf_len;
 904                                 if (dasd_eckd_identify_conf_parts(private)) {
 905                                         private->conf_data = NULL;
 906                                         private->conf_len = 0;
 907                                         kfree(conf_data);
 908                                         continue;
 909                                 }
 910                                 conf_data_saved++;
 911                         }
 912                         switch (dasd_eckd_path_access(conf_data, conf_len)) {
 913                         case 0x02:
 914                                 path_data->npm |= lpm;
 915                                 break;
 916                         case 0x03:
 917                                 path_data->ppm |= lpm;
 918                                 break;
 919                         }
 920                         if (conf_data != private->conf_data)
 921                                 kfree(conf_data);
 922                 }
 923         }
 924         return 0;
 925 }
 926
 927 static int dasd_eckd_read_features(struct dasd_device *device)
 928 {
 929         struct dasd_psf_prssd_data *prssdp;
 930         struct dasd_rssd_features *features;
 931         struct dasd_ccw_req *cqr;
 932         struct ccw1 *ccw;
 933         int rc;
 934         struct dasd_eckd_private *private;
 935
 936         private = (struct dasd_eckd_private *) device->private;
 937         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
 938                                    1 /* PSF */  + 1 /* RSSD */ ,
 939                                    (sizeof(struct dasd_psf_prssd_data) +
 940                                     sizeof(struct dasd_rssd_features)),
 941                                    device);
 942         if (IS_ERR(cqr)) {
 943                 DBF_EVENT(DBF_WARNING, "Could not allocate initialization "
 944                           "request for device: %s",
 945                           dev_name(&device->cdev->dev));
 946                 return PTR_ERR(cqr);
 947         }
 948         cqr->startdev = device;
 949         cqr->memdev = device;
 950         cqr->block = NULL;
 951         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 952         cqr->retries = 5;
 953         cqr->expires = 10 * HZ;
 954
 955         /* Prepare for Read Subsystem Data */
 956         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
 957         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
 958         prssdp->order = PSF_ORDER_PRSSD;
 959         prssdp->suborder = 0x41;        /* Read Feature Codes */
 960         /* all other bytes of prssdp must be zero */
 961
 962         ccw = cqr->cpaddr;
 963         ccw->cmd_code = DASD_ECKD_CCW_PSF;
 964         ccw->count = sizeof(struct dasd_psf_prssd_data);
 965         ccw->flags |= CCW_FLAG_CC;
 966         ccw->cda = (__u32)(addr_t) prssdp;
 967
 968         /* Read Subsystem Data - feature codes */
 969         features = (struct dasd_rssd_features *) (prssdp + 1);
 970         memset(features, 0, sizeof(struct dasd_rssd_features));
 971
 972         ccw++;
 973         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
 974         ccw->count = sizeof(struct dasd_rssd_features);
 975         ccw->cda = (__u32)(addr_t) features;
 976
 977         cqr->buildclk = get_clock();
 978         cqr->status = DASD_CQR_FILLED;
 979         rc = dasd_sleep_on(cqr);
 980         if (rc == 0) {
 981                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
 982                 features = (struct dasd_rssd_features *) (prssdp + 1);
 983                 memcpy(&private->features, features,
 984                        sizeof(struct dasd_rssd_features));
 985         }
 986         dasd_sfree_request(cqr, cqr->memdev);
 987         return rc;
 988 }
 989
 990
 991 /*
 992  * Build CP for Perform Subsystem Function - SSC.
 993  */
 994 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
 995                                                     int enable_pav)
 996 {
 997         struct dasd_ccw_req *cqr;
 998         struct dasd_psf_ssc_data *psf_ssc_data;
 999         struct ccw1 *ccw;
1000
1001         cqr = dasd_smalloc_request("ECKD", 1 /* PSF */ ,
1002                                   sizeof(struct dasd_psf_ssc_data),
1003                                   device);
1004
1005         if (IS_ERR(cqr)) {
1006                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1007                            "Could not allocate PSF-SSC request");
1008                 return cqr;
1009         }
1010         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1011         psf_ssc_data->order = PSF_ORDER_SSC;
1012         psf_ssc_data->suborder = 0x40;
1013         if (enable_pav) {
1014                 psf_ssc_data->suborder |= 0x88;
1015                 psf_ssc_data->reserved[0] = 0x88;
1016         }
1017         ccw = cqr->cpaddr;
1018         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1019         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1020         ccw->count = 66;
1021
1022         cqr->startdev = device;
1023         cqr->memdev = device;
1024         cqr->block = NULL;
1025         cqr->expires = 10*HZ;
1026         cqr->buildclk = get_clock();
1027         cqr->status = DASD_CQR_FILLED;
1028         return cqr;
1029 }
1030
1031 /*
1032  * Perform Subsystem Function.
1033  * It is necessary to trigger CIO for channel revalidation since this
1034  * call might change behaviour of DASD devices.
1035  */
1036 static int
1037 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav)
1038 {
1039         struct dasd_ccw_req *cqr;
1040         int rc;
1041
1042         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1043         if (IS_ERR(cqr))
1044                 return PTR_ERR(cqr);
1045
1046         rc = dasd_sleep_on(cqr);
1047         if (!rc)
1048                 /* trigger CIO to reprobe devices */
1049                 css_schedule_reprobe();
1050         dasd_sfree_request(cqr, cqr->memdev);
1051         return rc;
1052 }
1053
1054 /*
1055  * Valide storage server of current device.
1056  */
1057 static int dasd_eckd_validate_server(struct dasd_device *device)
1058 {
1059         int rc;
1060         struct dasd_eckd_private *private;
1061         int enable_pav;
1062
1063         if (dasd_nopav || MACHINE_IS_VM)
1064                 enable_pav = 0;
1065         else
1066                 enable_pav = 1;
1067         rc = dasd_eckd_psf_ssc(device, enable_pav);
1068         /* may be requested feature is not available on server,
1069          * therefore just report error and go ahead */
1070         private = (struct dasd_eckd_private *) device->private;
1071         DBF_EVENT(DBF_WARNING, "PSF-SSC on storage subsystem %s.%s.%04x "
1072                   "returned rc=%d for device: %s",
1073                   private->uid.vendor, private->uid.serial,
1074                   private->uid.ssid, rc, dev_name(&device->cdev->dev));
1075         /* RE-Read Configuration Data */
1076         return dasd_eckd_read_conf(device);
1077 }
1078
1079 /*
1080  * Check device characteristics.
1081  * If the device is accessible using ECKD discipline, the device is enabled.
1082  */
1083 static int
1084 dasd_eckd_check_characteristics(struct dasd_device *device)
1085 {
1086         struct dasd_eckd_private *private;
1087         struct dasd_block *block;
1088         int is_known, rc;
1089
1090         private = (struct dasd_eckd_private *) device->private;
1091         if (!private) {
1092                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1093                 if (!private) {
1094                         dev_warn(&device->cdev->dev,
1095                                  "Allocating memory for private DASD data "
1096                                  "failed\n");
1097                         return -ENOMEM;
1098                 }
1099                 device->private = (void *) private;
1100         } else {
1101                 memset(private, 0, sizeof(*private));
1102         }
1103         /* Invalidate status of initial analysis. */
1104         private->init_cqr_status = -1;
1105         /* Set default cache operations. */
1106         private->attrib.operation = DASD_NORMAL_CACHE;
1107         private->attrib.nr_cyl = 0;
1108
1109         /* Read Configuration Data */
1110         rc = dasd_eckd_read_conf(device);
1111         if (rc)
1112                 goto out_err1;
1113
1114         /* Generate device unique id and register in devmap */
1115         rc = dasd_eckd_generate_uid(device, &private->uid);
1116         if (rc)
1117                 goto out_err1;
1118         dasd_set_uid(device->cdev, &private->uid);
1119
1120         if (private->uid.type == UA_BASE_DEVICE) {
1121                 block = dasd_alloc_block();
1122                 if (IS_ERR(block)) {
1123                         DBF_EVENT(DBF_WARNING, "could not allocate dasd "
1124                                   "block structure for device: %s",
1125                                   dev_name(&device->cdev->dev));
1126                         rc = PTR_ERR(block);
1127                         goto out_err1;
1128                 }
1129                 device->block = block;
1130                 block->base = device;
1131         }
1132
1133         /* register lcu with alias handling, enable PAV if this is a new lcu */
1134         is_known = dasd_alias_make_device_known_to_lcu(device);
1135         if (is_known < 0) {
1136                 rc = is_known;
1137                 goto out_err2;
1138         }
1139         if (!is_known) {
1140                 /* new lcu found */
1141                 rc = dasd_eckd_validate_server(device); /* will switch pav on */
1142                 if (rc)
1143                         goto out_err3;
1144         }
1145
1146         /* Read Feature Codes */
1147         rc = dasd_eckd_read_features(device);
1148         if (rc)
1149                 goto out_err3;
1150
1151         /* Read Device Characteristics */
1152         rc = dasd_generic_read_dev_chars(device, "ECKD", &private->rdc_data,
1153                                          64);
1154         if (rc) {
1155                 DBF_EVENT(DBF_WARNING,
1156                           "Read device characteristics failed, rc=%d for "
1157                           "device: %s", rc, dev_name(&device->cdev->dev));
1158                 goto out_err3;
1159         }
1160         /* find the vaild cylinder size */
1161         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1162             private->rdc_data.long_no_cyl)
1163                 private->real_cyl = private->rdc_data.long_no_cyl;
1164         else
1165                 private->real_cyl = private->rdc_data.no_cyl;
1166
1167         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1168                  "with %d cylinders, %d heads, %d sectors\n",
1169                  private->rdc_data.dev_type,
1170                  private->rdc_data.dev_model,
1171                  private->rdc_data.cu_type,
1172                  private->rdc_data.cu_model.model,
1173                  private->real_cyl,
1174                  private->rdc_data.trk_per_cyl,
1175                  private->rdc_data.sec_per_trk);
1176         return 0;
1177
1178 out_err3:
1179         dasd_alias_disconnect_device_from_lcu(device);
1180 out_err2:
1181         dasd_free_block(device->block);
1182         device->block = NULL;
1183 out_err1:
1184         kfree(private->conf_data);
1185         kfree(device->private);
1186         device->private = NULL;
1187         return rc;
1188 }
1189
1190 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1191 {
1192         struct dasd_eckd_private *private;
1193
1194         private = (struct dasd_eckd_private *) device->private;
1195         dasd_alias_disconnect_device_from_lcu(device);
1196         private->ned = NULL;
1197         private->sneq = NULL;
1198         private->vdsneq = NULL;
1199         private->gneq = NULL;
1200         private->conf_len = 0;
1201         kfree(private->conf_data);
1202         private->conf_data = NULL;
1203 }
1204
1205 static struct dasd_ccw_req *
1206 dasd_eckd_analysis_ccw(struct dasd_device *device)
1207 {
1208         struct dasd_eckd_private *private;
1209         struct eckd_count *count_data;
1210         struct LO_eckd_data *LO_data;
1211         struct dasd_ccw_req *cqr;
1212         struct ccw1 *ccw;
1213         int cplength, datasize;
1214         int i;
1215
1216         private = (struct dasd_eckd_private *) device->private;
1217
1218         cplength = 8;
1219         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1220         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1221                                    cplength, datasize, device);
1222         if (IS_ERR(cqr))
1223                 return cqr;
1224         ccw = cqr->cpaddr;
1225         /* Define extent for the first 3 tracks. */
1226         define_extent(ccw++, cqr->data, 0, 2,
1227                       DASD_ECKD_CCW_READ_COUNT, device);
1228         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1229         /* Locate record for the first 4 records on track 0. */
1230         ccw[-1].flags |= CCW_FLAG_CC;
1231         locate_record(ccw++, LO_data++, 0, 0, 4,
1232                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1233
1234         count_data = private->count_area;
1235         for (i = 0; i < 4; i++) {
1236                 ccw[-1].flags |= CCW_FLAG_CC;
1237                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1238                 ccw->flags = 0;
1239                 ccw->count = 8;
1240                 ccw->cda = (__u32)(addr_t) count_data;
1241                 ccw++;
1242                 count_data++;
1243         }
1244
1245         /* Locate record for the first record on track 2. */
1246         ccw[-1].flags |= CCW_FLAG_CC;
1247         locate_record(ccw++, LO_data++, 2, 0, 1,
1248                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1249         /* Read count ccw. */
1250         ccw[-1].flags |= CCW_FLAG_CC;
1251         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1252         ccw->flags = 0;
1253         ccw->count = 8;
1254         ccw->cda = (__u32)(addr_t) count_data;
1255
1256         cqr->block = NULL;
1257         cqr->startdev = device;
1258         cqr->memdev = device;
1259         cqr->retries = 0;
1260         cqr->buildclk = get_clock();
1261         cqr->status = DASD_CQR_FILLED;
1262         return cqr;
1263 }
1264
1265 /*
1266  * This is the callback function for the init_analysis cqr. It saves
1267  * the status of the initial analysis ccw before it frees it and kicks
1268  * the device to continue the startup sequence. This will call
1269  * dasd_eckd_do_analysis again (if the devices has not been marked
1270  * for deletion in the meantime).
1271  */
1272 static void
1273 dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, void *data)
1274 {
1275         struct dasd_eckd_private *private;
1276         struct dasd_device *device;
1277
1278         device = init_cqr->startdev;
1279         private = (struct dasd_eckd_private *) device->private;
1280         private->init_cqr_status = init_cqr->status;
1281         dasd_sfree_request(init_cqr, device);
1282         dasd_kick_device(device);
1283 }
1284
1285 static int
1286 dasd_eckd_start_analysis(struct dasd_block *block)
1287 {
1288         struct dasd_eckd_private *private;
1289         struct dasd_ccw_req *init_cqr;
1290
1291         private = (struct dasd_eckd_private *) block->base->private;
1292         init_cqr = dasd_eckd_analysis_ccw(block->base);
1293         if (IS_ERR(init_cqr))
1294                 return PTR_ERR(init_cqr);
1295         init_cqr->callback = dasd_eckd_analysis_callback;
1296         init_cqr->callback_data = NULL;
1297         init_cqr->expires = 5*HZ;
1298         dasd_add_request_head(init_cqr);
1299         return -EAGAIN;
1300 }
1301
1302 static int
1303 dasd_eckd_end_analysis(struct dasd_block *block)
1304 {
1305         struct dasd_device *device;
1306         struct dasd_eckd_private *private;
1307         struct eckd_count *count_area;
1308         unsigned int sb, blk_per_trk;
1309         int status, i;
1310
1311         device = block->base;
1312         private = (struct dasd_eckd_private *) device->private;
1313         status = private->init_cqr_status;
1314         private->init_cqr_status = -1;
1315         if (status != DASD_CQR_DONE) {
1316                 dev_warn(&device->cdev->dev,
1317                             "The DASD is not formatted\n");
1318                 return -EMEDIUMTYPE;
1319         }
1320
1321         private->uses_cdl = 1;
1322         /* Check Track 0 for Compatible Disk Layout */
1323         count_area = NULL;
1324         for (i = 0; i < 3; i++) {
1325                 if (private->count_area[i].kl != 4 ||
1326                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
1327                         private->uses_cdl = 0;
1328                         break;
1329                 }
1330         }
1331         if (i == 3)
1332                 count_area = &private->count_area[4];
1333
1334         if (private->uses_cdl == 0) {
1335                 for (i = 0; i < 5; i++) {
1336                         if ((private->count_area[i].kl != 0) ||
1337                             (private->count_area[i].dl !=
1338                              private->count_area[0].dl))
1339                                 break;
1340                 }
1341                 if (i == 5)
1342                         count_area = &private->count_area[0];
1343         } else {
1344                 if (private->count_area[3].record == 1)
1345                         dev_warn(&device->cdev->dev,
1346                                  "Track 0 has no records following the VTOC\n");
1347         }
1348         if (count_area != NULL && count_area->kl == 0) {
1349                 /* we found notthing violating our disk layout */
1350                 if (dasd_check_blocksize(count_area->dl) == 0)
1351                         block->bp_block = count_area->dl;
1352         }
1353         if (block->bp_block == 0) {
1354                 dev_warn(&device->cdev->dev,
1355                          "The disk layout of the DASD is not supported\n");
1356                 return -EMEDIUMTYPE;
1357         }
1358         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1359         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1360                 block->s2b_shift++;
1361
1362         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1363         block->blocks = (private->real_cyl *
1364                           private->rdc_data.trk_per_cyl *
1365                           blk_per_trk);
1366
1367         dev_info(&device->cdev->dev,
1368                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
1369                  "%s\n", (block->bp_block >> 10),
1370                  ((private->real_cyl *
1371                    private->rdc_data.trk_per_cyl *
1372                    blk_per_trk * (block->bp_block >> 9)) >> 1),
1373                  ((blk_per_trk * block->bp_block) >> 10),
1374                  private->uses_cdl ?
1375                  "compatible disk layout" : "linux disk layout");
1376
1377         return 0;
1378 }
1379
1380 static int dasd_eckd_do_analysis(struct dasd_block *block)
1381 {
1382         struct dasd_eckd_private *private;
1383
1384         private = (struct dasd_eckd_private *) block->base->private;
1385         if (private->init_cqr_status < 0)
1386                 return dasd_eckd_start_analysis(block);
1387         else
1388                 return dasd_eckd_end_analysis(block);
1389 }
1390
1391 static int dasd_eckd_ready_to_online(struct dasd_device *device)
1392 {
1393         return dasd_alias_add_device(device);
1394 };
1395
1396 static int dasd_eckd_online_to_ready(struct dasd_device *device)
1397 {
1398         return dasd_alias_remove_device(device);
1399 };
1400
1401 static int
1402 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
1403 {
1404         struct dasd_eckd_private *private;
1405
1406         private = (struct dasd_eckd_private *) block->base->private;
1407         if (dasd_check_blocksize(block->bp_block) == 0) {
1408                 geo->sectors = recs_per_track(&private->rdc_data,
1409                                               0, block->bp_block);
1410         }
1411         geo->cylinders = private->rdc_data.no_cyl;
1412         geo->heads = private->rdc_data.trk_per_cyl;
1413         return 0;
1414 }
1415
1416 static struct dasd_ccw_req *
1417 dasd_eckd_format_device(struct dasd_device * device,
1418                         struct format_data_t * fdata)
1419 {
1420         struct dasd_eckd_private *private;
1421         struct dasd_ccw_req *fcp;
1422         struct eckd_count *ect;
1423         struct ccw1 *ccw;
1424         void *data;
1425         int rpt;
1426         struct ch_t address;
1427         int cplength, datasize;
1428         int i;
1429         int intensity = 0;
1430         int r0_perm;
1431
1432         private = (struct dasd_eckd_private *) device->private;
1433         rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
1434         set_ch_t(&address,
1435                  fdata->start_unit / private->rdc_data.trk_per_cyl,
1436                  fdata->start_unit % private->rdc_data.trk_per_cyl);
1437
1438         /* Sanity checks. */
1439         if (fdata->start_unit >=
1440             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
1441                 dev_warn(&device->cdev->dev, "Start track number %d used in "
1442                          "formatting is too big\n", fdata->start_unit);
1443                 return ERR_PTR(-EINVAL);
1444         }
1445         if (fdata->start_unit > fdata->stop_unit) {
1446                 dev_warn(&device->cdev->dev, "Start track %d used in "
1447                          "formatting exceeds end track\n", fdata->start_unit);
1448                 return ERR_PTR(-EINVAL);
1449         }
1450         if (dasd_check_blocksize(fdata->blksize) != 0) {
1451                 dev_warn(&device->cdev->dev,
1452                          "The DASD cannot be formatted with block size %d\n",
1453                          fdata->blksize);
1454                 return ERR_PTR(-EINVAL);
1455         }
1456
1457         /*
1458          * fdata->intensity is a bit string that tells us what to do:
1459          *   Bit 0: write record zero
1460          *   Bit 1: write home address, currently not supported
1461          *   Bit 2: invalidate tracks
1462          *   Bit 3: use OS/390 compatible disk layout (cdl)
1463          *   Bit 4: do not allow storage subsystem to modify record zero
1464          * Only some bit combinations do make sense.
1465          */
1466         if (fdata->intensity & 0x10) {
1467                 r0_perm = 0;
1468                 intensity = fdata->intensity & ~0x10;
1469         } else {
1470                 r0_perm = 1;
1471                 intensity = fdata->intensity;
1472         }
1473         switch (intensity) {
1474         case 0x00:      /* Normal format */
1475         case 0x08:      /* Normal format, use cdl. */
1476                 cplength = 2 + rpt;
1477                 datasize = sizeof(struct DE_eckd_data) +
1478                         sizeof(struct LO_eckd_data) +
1479                         rpt * sizeof(struct eckd_count);
1480                 break;
1481         case 0x01:      /* Write record zero and format track. */
1482         case 0x09:      /* Write record zero and format track, use cdl. */
1483                 cplength = 3 + rpt;
1484                 datasize = sizeof(struct DE_eckd_data) +
1485                         sizeof(struct LO_eckd_data) +
1486                         sizeof(struct eckd_count) +
1487                         rpt * sizeof(struct eckd_count);
1488                 break;
1489         case 0x04:      /* Invalidate track. */
1490         case 0x0c:      /* Invalidate track, use cdl. */
1491                 cplength = 3;
1492                 datasize = sizeof(struct DE_eckd_data) +
1493                         sizeof(struct LO_eckd_data) +
1494                         sizeof(struct eckd_count);
1495                 break;
1496         default:
1497                 dev_warn(&device->cdev->dev, "An I/O control call used "
1498                          "incorrect flags 0x%x\n", fdata->intensity);
1499                 return ERR_PTR(-EINVAL);
1500         }
1501         /* Allocate the format ccw request. */
1502         fcp = dasd_smalloc_request(dasd_eckd_discipline.name,
1503                                    cplength, datasize, device);
1504         if (IS_ERR(fcp))
1505                 return fcp;
1506
1507         data = fcp->data;
1508         ccw = fcp->cpaddr;
1509
1510         switch (intensity & ~0x08) {
1511         case 0x00: /* Normal format. */
1512                 define_extent(ccw++, (struct DE_eckd_data *) data,
1513                               fdata->start_unit, fdata->start_unit,
1514                               DASD_ECKD_CCW_WRITE_CKD, device);
1515                 /* grant subsystem permission to format R0 */
1516                 if (r0_perm)
1517                         ((struct DE_eckd_data *)data)->ga_extended |= 0x04;
1518                 data += sizeof(struct DE_eckd_data);
1519                 ccw[-1].flags |= CCW_FLAG_CC;
1520                 locate_record(ccw++, (struct LO_eckd_data *) data,
1521                               fdata->start_unit, 0, rpt,
1522                               DASD_ECKD_CCW_WRITE_CKD, device,
1523                               fdata->blksize);
1524                 data += sizeof(struct LO_eckd_data);
1525                 break;
1526         case 0x01: /* Write record zero + format track. */
1527                 define_extent(ccw++, (struct DE_eckd_data *) data,
1528                               fdata->start_unit, fdata->start_unit,
1529                               DASD_ECKD_CCW_WRITE_RECORD_ZERO,
1530                               device);
1531                 data += sizeof(struct DE_eckd_data);
1532                 ccw[-1].flags |= CCW_FLAG_CC;
1533                 locate_record(ccw++, (struct LO_eckd_data *) data,
1534                               fdata->start_unit, 0, rpt + 1,
1535                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
1536                               device->block->bp_block);
1537                 data += sizeof(struct LO_eckd_data);
1538                 break;
1539         case 0x04: /* Invalidate track. */
1540                 define_extent(ccw++, (struct DE_eckd_data *) data,
1541                               fdata->start_unit, fdata->start_unit,
1542                               DASD_ECKD_CCW_WRITE_CKD, device);
1543                 data += sizeof(struct DE_eckd_data);
1544                 ccw[-1].flags |= CCW_FLAG_CC;
1545                 locate_record(ccw++, (struct LO_eckd_data *) data,
1546                               fdata->start_unit, 0, 1,
1547                               DASD_ECKD_CCW_WRITE_CKD, device, 8);
1548                 data += sizeof(struct LO_eckd_data);
1549                 break;
1550         }
1551         if (intensity & 0x01) { /* write record zero */
1552                 ect = (struct eckd_count *) data;
1553                 data += sizeof(struct eckd_count);
1554                 ect->cyl = address.cyl;
1555                 ect->head = address.head;
1556                 ect->record = 0;
1557                 ect->kl = 0;
1558                 ect->dl = 8;
1559                 ccw[-1].flags |= CCW_FLAG_CC;
1560                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
1561                 ccw->flags = CCW_FLAG_SLI;
1562                 ccw->count = 8;
1563                 ccw->cda = (__u32)(addr_t) ect;
1564                 ccw++;
1565         }
1566         if ((intensity & ~0x08) & 0x04) {       /* erase track */
1567                 ect = (struct eckd_count *) data;
1568                 data += sizeof(struct eckd_count);
1569                 ect->cyl = address.cyl;
1570                 ect->head = address.head;
1571                 ect->record = 1;
1572                 ect->kl = 0;
1573                 ect->dl = 0;
1574                 ccw[-1].flags |= CCW_FLAG_CC;
1575                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1576                 ccw->flags = CCW_FLAG_SLI;
1577                 ccw->count = 8;
1578                 ccw->cda = (__u32)(addr_t) ect;
1579         } else {                /* write remaining records */
1580                 for (i = 0; i < rpt; i++) {
1581                         ect = (struct eckd_count *) data;
1582                         data += sizeof(struct eckd_count);
1583                         ect->cyl = address.cyl;
1584                         ect->head = address.head;
1585                         ect->record = i + 1;
1586                         ect->kl = 0;
1587                         ect->dl = fdata->blksize;
1588                         /* Check for special tracks 0-1 when formatting CDL */
1589                         if ((intensity & 0x08) &&
1590                             fdata->start_unit == 0) {
1591                                 if (i < 3) {
1592                                         ect->kl = 4;
1593                                         ect->dl = sizes_trk0[i] - 4;
1594                                 }
1595                         }
1596                         if ((intensity & 0x08) &&
1597                             fdata->start_unit == 1) {
1598                                 ect->kl = 44;
1599                                 ect->dl = LABEL_SIZE - 44;
1600                         }
1601                         ccw[-1].flags |= CCW_FLAG_CC;
1602                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1603                         ccw->flags = CCW_FLAG_SLI;
1604                         ccw->count = 8;
1605                         ccw->cda = (__u32)(addr_t) ect;
1606                         ccw++;
1607                 }
1608         }
1609         fcp->startdev = device;
1610         fcp->memdev = device;
1611         clear_bit(DASD_CQR_FLAGS_USE_ERP, &fcp->flags);
1612         fcp->retries = 5;       /* set retry counter to enable default ERP */
1613         fcp->buildclk = get_clock();
1614         fcp->status = DASD_CQR_FILLED;
1615         return fcp;
1616 }
1617
1618 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
1619 {
1620         cqr->status = DASD_CQR_FILLED;
1621         if (cqr->block && (cqr->startdev != cqr->block->base)) {
1622                 dasd_eckd_reset_ccw_to_base_io(cqr);
1623                 cqr->startdev = cqr->block->base;
1624         }
1625 };
1626
1627 static dasd_erp_fn_t
1628 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
1629 {
1630         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
1631         struct ccw_device *cdev = device->cdev;
1632
1633         switch (cdev->id.cu_type) {
1634         case 0x3990:
1635         case 0x2105:
1636         case 0x2107:
1637         case 0x1750:
1638                 return dasd_3990_erp_action;
1639         case 0x9343:
1640         case 0x3880:
1641         default:
1642                 return dasd_default_erp_action;
1643         }
1644 }
1645
1646 static dasd_erp_fn_t
1647 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
1648 {
1649         return dasd_default_erp_postaction;
1650 }
1651
1652
1653 static void dasd_eckd_handle_unsolicited_interrupt(struct dasd_device *device,
1654                                                    struct irb *irb)
1655 {
1656         char mask;
1657         char *sense = NULL;
1658
1659         /* first of all check for state change pending interrupt */
1660         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
1661         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
1662                 dasd_generic_handle_state_change(device);
1663                 return;
1664         }
1665
1666         /* summary unit check */
1667         if ((scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
1668             (irb->ecw[7] == 0x0D)) {
1669                 dasd_alias_handle_summary_unit_check(device, irb);
1670                 return;
1671         }
1672
1673         sense = dasd_get_sense(irb);
1674         /* service information message SIM */
1675         if (sense && !(sense[27] & DASD_SENSE_BIT_0) &&
1676             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
1677                 dasd_3990_erp_handle_sim(device, sense);
1678                 dasd_schedule_device_bh(device);
1679                 return;
1680         }
1681
1682         if ((scsw_cc(&irb->scsw) == 1) &&
1683             (scsw_fctl(&irb->scsw) & SCSW_FCTL_START_FUNC) &&
1684             (scsw_actl(&irb->scsw) & SCSW_ACTL_START_PEND) &&
1685             (scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND)) {
1686                 /* fake irb do nothing, they are handled elsewhere */
1687                 dasd_schedule_device_bh(device);
1688                 return;
1689         }
1690
1691         if (!sense) {
1692                 /* just report other unsolicited interrupts */
1693                 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1694                             "unsolicited interrupt received");
1695         } else {
1696                 DBF_DEV_EVENT(DBF_ERR, device, "%s",
1697                             "unsolicited interrupt received "
1698                             "(sense available)");
1699                 device->discipline->dump_sense_dbf(device, NULL, irb,
1700                                                    "unsolicited");
1701         }
1702
1703         dasd_schedule_device_bh(device);
1704         return;
1705 };
1706
1707
1708 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
1709                                                struct dasd_device *startdev,
1710                                                struct dasd_block *block,
1711                                                struct request *req,
1712                                                sector_t first_rec,
1713                                                sector_t last_rec,
1714                                                sector_t first_trk,
1715                                                sector_t last_trk,
1716                                                unsigned int first_offs,
1717                                                unsigned int last_offs,
1718                                                unsigned int blk_per_trk,
1719                                                unsigned int blksize)
1720 {
1721         struct dasd_eckd_private *private;
1722         unsigned long *idaws;
1723         struct LO_eckd_data *LO_data;
1724         struct dasd_ccw_req *cqr;
1725         struct ccw1 *ccw;
1726         struct req_iterator iter;
1727         struct bio_vec *bv;
1728         char *dst;
1729         unsigned int off;
1730         int count, cidaw, cplength, datasize;
1731         sector_t recid;
1732         unsigned char cmd, rcmd;
1733         int use_prefix;
1734         struct dasd_device *basedev;
1735
1736         basedev = block->base;
1737         private = (struct dasd_eckd_private *) basedev->private;
1738         if (rq_data_dir(req) == READ)
1739                 cmd = DASD_ECKD_CCW_READ_MT;
1740         else if (rq_data_dir(req) == WRITE)
1741                 cmd = DASD_ECKD_CCW_WRITE_MT;
1742         else
1743                 return ERR_PTR(-EINVAL);
1744
1745         /* Check struct bio and count the number of blocks for the request. */
1746         count = 0;
1747         cidaw = 0;
1748         rq_for_each_segment(bv, req, iter) {
1749                 if (bv->bv_len & (blksize - 1))
1750                         /* Eckd can only do full blocks. */
1751                         return ERR_PTR(-EINVAL);
1752                 count += bv->bv_len >> (block->s2b_shift + 9);
1753 #if defined(CONFIG_64BIT)
1754                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
1755                         cidaw += bv->bv_len >> (block->s2b_shift + 9);
1756 #endif
1757         }
1758         /* Paranoia. */
1759         if (count != last_rec - first_rec + 1)
1760                 return ERR_PTR(-EINVAL);
1761
1762         /* use the prefix command if available */
1763         use_prefix = private->features.feature[8] & 0x01;
1764         if (use_prefix) {
1765                 /* 1x prefix + number of blocks */
1766                 cplength = 2 + count;
1767                 /* 1x prefix + cidaws*sizeof(long) */
1768                 datasize = sizeof(struct PFX_eckd_data) +
1769                         sizeof(struct LO_eckd_data) +
1770                         cidaw * sizeof(unsigned long);
1771         } else {
1772                 /* 1x define extent + 1x locate record + number of blocks */
1773                 cplength = 2 + count;
1774                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
1775                 datasize = sizeof(struct DE_eckd_data) +
1776                         sizeof(struct LO_eckd_data) +
1777                         cidaw * sizeof(unsigned long);
1778         }
1779         /* Find out the number of additional locate record ccws for cdl. */
1780         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
1781                 if (last_rec >= 2*blk_per_trk)
1782                         count = 2*blk_per_trk - first_rec;
1783                 cplength += count;
1784                 datasize += count*sizeof(struct LO_eckd_data);
1785         }
1786         /* Allocate the ccw request. */
1787         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1788                                    cplength, datasize, startdev);
1789         if (IS_ERR(cqr))
1790                 return cqr;
1791         ccw = cqr->cpaddr;
1792         /* First ccw is define extent or prefix. */
1793         if (use_prefix) {
1794                 if (prefix(ccw++, cqr->data, first_trk,
1795                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
1796                         /* Clock not in sync and XRC is enabled.
1797                          * Try again later.
1798                          */
1799                         dasd_sfree_request(cqr, startdev);
1800                         return ERR_PTR(-EAGAIN);
1801                 }
1802                 idaws = (unsigned long *) (cqr->data +
1803                                            sizeof(struct PFX_eckd_data));
1804         } else {
1805                 if (define_extent(ccw++, cqr->data, first_trk,
1806                                   last_trk, cmd, startdev) == -EAGAIN) {
1807                         /* Clock not in sync and XRC is enabled.
1808                          * Try again later.
1809                          */
1810                         dasd_sfree_request(cqr, startdev);
1811                         return ERR_PTR(-EAGAIN);
1812                 }
1813                 idaws = (unsigned long *) (cqr->data +
1814                                            sizeof(struct DE_eckd_data));
1815         }
1816         /* Build locate_record+read/write/ccws. */
1817         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
1818         recid = first_rec;
1819         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
1820                 /* Only standard blocks so there is just one locate record. */
1821                 ccw[-1].flags |= CCW_FLAG_CC;
1822                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
1823                               last_rec - recid + 1, cmd, basedev, blksize);
1824         }
1825         rq_for_each_segment(bv, req, iter) {
1826                 dst = page_address(bv->bv_page) + bv->bv_offset;
1827                 if (dasd_page_cache) {
1828                         char *copy = kmem_cache_alloc(dasd_page_cache,
1829                                                       GFP_DMA | __GFP_NOWARN);
1830                         if (copy && rq_data_dir(req) == WRITE)
1831                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
1832                         if (copy)
1833                                 dst = copy + bv->bv_offset;
1834                 }
1835                 for (off = 0; off < bv->bv_len; off += blksize) {
1836                         sector_t trkid = recid;
1837                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
1838                         rcmd = cmd;
1839                         count = blksize;
1840                         /* Locate record for cdl special block ? */
1841                         if (private->uses_cdl && recid < 2*blk_per_trk) {
1842                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
1843                                         rcmd |= 0x8;
1844                                         count = dasd_eckd_cdl_reclen(recid);
1845                                         if (count < blksize &&
1846                                             rq_data_dir(req) == READ)
1847                                                 memset(dst + count, 0xe5,
1848                                                        blksize - count);
1849                                 }
1850                                 ccw[-1].flags |= CCW_FLAG_CC;
1851                                 locate_record(ccw++, LO_data++,
1852                                               trkid, recoffs + 1,
1853                                               1, rcmd, basedev, count);
1854                         }
1855                         /* Locate record for standard blocks ? */
1856                         if (private->uses_cdl && recid == 2*blk_per_trk) {
1857                                 ccw[-1].flags |= CCW_FLAG_CC;
1858                                 locate_record(ccw++, LO_data++,
1859                                               trkid, recoffs + 1,
1860                                               last_rec - recid + 1,
1861                                               cmd, basedev, count);
1862                         }
1863                         /* Read/write ccw. */
1864                         ccw[-1].flags |= CCW_FLAG_CC;
1865                         ccw->cmd_code = rcmd;
1866                         ccw->count = count;
1867                         if (idal_is_needed(dst, blksize)) {
1868                                 ccw->cda = (__u32)(addr_t) idaws;
1869                                 ccw->flags = CCW_FLAG_IDA;
1870                                 idaws = idal_create_words(idaws, dst, blksize);
1871                         } else {
1872                                 ccw->cda = (__u32)(addr_t) dst;
1873                                 ccw->flags = 0;
1874                         }
1875                         ccw++;
1876                         dst += blksize;
1877                         recid++;
1878                 }
1879         }
1880         if (blk_noretry_request(req) ||
1881             block->base->features & DASD_FEATURE_FAILFAST)
1882                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1883         cqr->startdev = startdev;
1884         cqr->memdev = startdev;
1885         cqr->block = block;
1886         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
1887         cqr->lpm = private->path_data.ppm;
1888         cqr->retries = 256;
1889         cqr->buildclk = get_clock();
1890         cqr->status = DASD_CQR_FILLED;
1891         return cqr;
1892 }
1893
1894 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
1895                                                struct dasd_device *startdev,
1896                                                struct dasd_block *block,
1897                                                struct request *req,
1898                                                sector_t first_rec,
1899                                                sector_t last_rec,
1900                                                sector_t first_trk,
1901                                                sector_t last_trk,
1902                                                unsigned int first_offs,
1903                                                unsigned int last_offs,
1904                                                unsigned int blk_per_trk,
1905                                                unsigned int blksize)
1906 {
1907         struct dasd_eckd_private *private;
1908         unsigned long *idaws;
1909         struct dasd_ccw_req *cqr;
1910         struct ccw1 *ccw;
1911         struct req_iterator iter;
1912         struct bio_vec *bv;
1913         char *dst, *idaw_dst;
1914         unsigned int cidaw, cplength, datasize;
1915         unsigned int tlf;
1916         sector_t recid;
1917         unsigned char cmd;
1918         struct dasd_device *basedev;
1919         unsigned int trkcount, count, count_to_trk_end;
1920         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
1921         unsigned char new_track, end_idaw;
1922         sector_t trkid;
1923         unsigned int recoffs;
1924
1925         basedev = block->base;
1926         private = (struct dasd_eckd_private *) basedev->private;
1927         if (rq_data_dir(req) == READ)
1928                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
1929         else if (rq_data_dir(req) == WRITE)
1930                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
1931         else
1932                 return ERR_PTR(-EINVAL);
1933
1934         /* Track based I/O needs IDAWs for each page, and not just for
1935          * 64 bit addresses. We need additional idals for pages
1936          * that get filled from two tracks, so we use the number
1937          * of records as upper limit.
1938          */
1939         cidaw = last_rec - first_rec + 1;
1940         trkcount = last_trk - first_trk + 1;
1941
1942         /* 1x prefix + one read/write ccw per track */
1943         cplength = 1 + trkcount;
1944
1945         /* on 31-bit we need space for two 32 bit addresses per page
1946          * on 64-bit one 64 bit address
1947          */
1948         datasize = sizeof(struct PFX_eckd_data) +
1949                 cidaw * sizeof(unsigned long long);
1950
1951         /* Allocate the ccw request. */
1952         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1953                                    cplength, datasize, startdev);
1954         if (IS_ERR(cqr))
1955                 return cqr;
1956         ccw = cqr->cpaddr;
1957         /* transfer length factor: how many bytes to read from the last track */
1958         if (first_trk == last_trk)
1959                 tlf = last_offs - first_offs + 1;
1960         else
1961                 tlf = last_offs + 1;
1962         tlf *= blksize;
1963
1964         if (prefix_LRE(ccw++, cqr->data, first_trk,
1965                        last_trk, cmd, basedev, startdev,
1966                        1 /* format */, first_offs + 1,
1967                        trkcount, blksize,
1968                        tlf) == -EAGAIN) {
1969                 /* Clock not in sync and XRC is enabled.
1970                  * Try again later.
1971                  */
1972                 dasd_sfree_request(cqr, startdev);
1973                 return ERR_PTR(-EAGAIN);
1974         }
1975
1976         /*
1977          * The translation of request into ccw programs must meet the
1978          * following conditions:
1979          * - all idaws but the first and the last must address full pages
1980          *   (or 2K blocks on 31-bit)
1981          * - the scope of a ccw and it's idal ends with the track boundaries
1982          */
1983         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
1984         recid = first_rec;
1985         new_track = 1;
1986         end_idaw = 0;
1987         len_to_track_end = 0;
1988         idaw_dst = 0;
1989         idaw_len = 0;
1990         rq_for_each_segment(bv, req, iter) {
1991                 dst = page_address(bv->bv_page) + bv->bv_offset;
1992                 seg_len = bv->bv_len;
1993                 while (seg_len) {
1994                         if (new_track) {
1995                                 trkid = recid;
1996                                 recoffs = sector_div(trkid, blk_per_trk);
1997                                 count_to_trk_end = blk_per_trk - recoffs;
1998                                 count = min((last_rec - recid + 1),
1999                                             (sector_t)count_to_trk_end);
2000                                 len_to_track_end = count * blksize;
2001                                 ccw[-1].flags |= CCW_FLAG_CC;
2002                                 ccw->cmd_code = cmd;
2003                                 ccw->count = len_to_track_end;
2004                                 ccw->cda = (__u32)(addr_t)idaws;
2005                                 ccw->flags = CCW_FLAG_IDA;
2006                                 ccw++;
2007                                 recid += count;
2008                                 new_track = 0;
2009                                 /* first idaw for a ccw may start anywhere */
2010                                 if (!idaw_dst)
2011                                         idaw_dst = dst;
2012                         }
2013                         /* If we start a new idaw, we must make sure that it
2014                          * starts on an IDA_BLOCK_SIZE boundary.
2015                          * If we continue an idaw, we must make sure that the
2016                          * current segment begins where the so far accumulated
2017                          * idaw ends
2018                          */
2019                         if (!idaw_dst) {
2020                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2021                                         dasd_sfree_request(cqr, startdev);
2022                                         return ERR_PTR(-ERANGE);
2023                                 } else
2024                                         idaw_dst = dst;
2025                         }
2026                         if ((idaw_dst + idaw_len) != dst) {
2027                                 dasd_sfree_request(cqr, startdev);
2028                                 return ERR_PTR(-ERANGE);
2029                         }
2030                         part_len = min(seg_len, len_to_track_end);
2031                         seg_len -= part_len;
2032                         dst += part_len;
2033                         idaw_len += part_len;
2034                         len_to_track_end -= part_len;
2035                         /* collected memory area ends on an IDA_BLOCK border,
2036                          * -> create an idaw
2037                          * idal_create_words will handle cases where idaw_len
2038                          * is larger then IDA_BLOCK_SIZE
2039                          */
2040                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2041                                 end_idaw = 1;
2042                         /* We also need to end the idaw at track end */
2043                         if (!len_to_track_end) {
2044                                 new_track = 1;
2045                                 end_idaw = 1;
2046                         }
2047                         if (end_idaw) {
2048                                 idaws = idal_create_words(idaws, idaw_dst,
2049                                                           idaw_len);
2050                                 idaw_dst = 0;
2051                                 idaw_len = 0;
2052                                 end_idaw = 0;
2053                         }
2054                 }
2055         }
2056
2057         if (blk_noretry_request(req) ||
2058             block->base->features & DASD_FEATURE_FAILFAST)
2059                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2060         cqr->startdev = startdev;
2061         cqr->memdev = startdev;
2062         cqr->block = block;
2063         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
2064         cqr->lpm = private->path_data.ppm;
2065         cqr->retries = 256;
2066         cqr->buildclk = get_clock();
2067         cqr->status = DASD_CQR_FILLED;
2068         return cqr;
2069 }
2070
2071 static int prepare_itcw(struct itcw *itcw,
2072                         unsigned int trk, unsigned int totrk, int cmd,
2073                         struct dasd_device *basedev,
2074                         struct dasd_device *startdev,
2075                         unsigned int rec_on_trk, int count,
2076                         unsigned int blksize,
2077                         unsigned int total_data_size,
2078                         unsigned int tlf,
2079                         unsigned int blk_per_trk)
2080 {
2081         struct PFX_eckd_data pfxdata;
2082         struct dasd_eckd_private *basepriv, *startpriv;
2083         struct DE_eckd_data *dedata;
2084         struct LRE_eckd_data *lredata;
2085         struct dcw *dcw;
2086
2087         u32 begcyl, endcyl;
2088         u16 heads, beghead, endhead;
2089         u8 pfx_cmd;
2090
2091         int rc = 0;
2092         int sector = 0;
2093         int dn, d;
2094
2095
2096         /* setup prefix data */
2097         basepriv = (struct dasd_eckd_private *) basedev->private;
2098         startpriv = (struct dasd_eckd_private *) startdev->private;
2099         dedata = &pfxdata.define_extent;
2100         lredata = &pfxdata.locate_record;
2101
2102         memset(&pfxdata, 0, sizeof(pfxdata));
2103         pfxdata.format = 1; /* PFX with LRE */
2104         pfxdata.base_address = basepriv->ned->unit_addr;
2105         pfxdata.base_lss = basepriv->ned->ID;
2106         pfxdata.validity.define_extent = 1;
2107
2108         /* private uid is kept up to date, conf_data may be outdated */
2109         if (startpriv->uid.type != UA_BASE_DEVICE) {
2110                 pfxdata.validity.verify_base = 1;
2111                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2112                         pfxdata.validity.hyper_pav = 1;
2113         }
2114
2115         switch (cmd) {
2116         case DASD_ECKD_CCW_READ_TRACK_DATA:
2117                 dedata->mask.perm = 0x1;
2118                 dedata->attributes.operation = basepriv->attrib.operation;
2119                 dedata->blk_size = blksize;
2120                 dedata->ga_extended |= 0x42;
2121                 lredata->operation.orientation = 0x0;
2122                 lredata->operation.operation = 0x0C;
2123                 lredata->auxiliary.check_bytes = 0x01;
2124                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2125                 break;
2126         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2127                 dedata->mask.perm = 0x02;
2128                 dedata->attributes.operation = basepriv->attrib.operation;
2129                 dedata->blk_size = blksize;
2130                 rc = check_XRC_on_prefix(&pfxdata, basedev);
2131                 dedata->ga_extended |= 0x42;
2132                 lredata->operation.orientation = 0x0;
2133                 lredata->operation.operation = 0x3F;
2134                 lredata->extended_operation = 0x23;
2135                 lredata->auxiliary.check_bytes = 0x2;
2136                 pfx_cmd = DASD_ECKD_CCW_PFX;
2137                 break;
2138         default:
2139                 DBF_DEV_EVENT(DBF_ERR, basedev,
2140                               "prepare itcw, unknown opcode 0x%x", cmd);
2141                 BUG();
2142                 break;
2143         }
2144         if (rc)
2145                 return rc;
2146
2147         dedata->attributes.mode = 0x3;  /* ECKD */
2148
2149         heads = basepriv->rdc_data.trk_per_cyl;
2150         begcyl = trk / heads;
2151         beghead = trk % heads;
2152         endcyl = totrk / heads;
2153         endhead = totrk % heads;
2154
2155         /* check for sequential prestage - enhance cylinder range */
2156         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2157             dedata->attributes.operation == DASD_SEQ_ACCESS) {
2158
2159                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2160                         endcyl += basepriv->attrib.nr_cyl;
2161                 else
2162                         endcyl = (basepriv->real_cyl - 1);
2163         }
2164
2165         set_ch_t(&dedata->beg_ext, begcyl, beghead);
2166         set_ch_t(&dedata->end_ext, endcyl, endhead);
2167
2168         dedata->ep_format = 0x20; /* records per track is valid */
2169         dedata->ep_rec_per_track = blk_per_trk;
2170
2171         if (rec_on_trk) {
2172                 switch (basepriv->rdc_data.dev_type) {
2173                 case 0x3390:
2174                         dn = ceil_quot(blksize + 6, 232);
2175                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
2176                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
2177                         break;
2178                 case 0x3380:
2179                         d = 7 + ceil_quot(blksize + 12, 32);
2180                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
2181                         break;
2182                 }
2183         }
2184
2185         lredata->auxiliary.length_valid = 1;
2186         lredata->auxiliary.length_scope = 1;
2187         lredata->auxiliary.imbedded_ccw_valid = 1;
2188         lredata->length = tlf;
2189         lredata->imbedded_ccw = cmd;
2190         lredata->count = count;
2191         lredata->sector = sector;
2192         set_ch_t(&lredata->seek_addr, begcyl, beghead);
2193         lredata->search_arg.cyl = lredata->seek_addr.cyl;
2194         lredata->search_arg.head = lredata->seek_addr.head;
2195         lredata->search_arg.record = rec_on_trk;
2196
2197         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
2198                      &pfxdata, sizeof(pfxdata), total_data_size);
2199
2200         return rc;
2201 }
2202
2203 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
2204                                                struct dasd_device *startdev,
2205                                                struct dasd_block *block,
2206                                                struct request *req,
2207                                                sector_t first_rec,
2208                                                sector_t last_rec,
2209                                                sector_t first_trk,
2210                                                sector_t last_trk,
2211                                                unsigned int first_offs,
2212                                                unsigned int last_offs,
2213                                                unsigned int blk_per_trk,
2214                                                unsigned int blksize)
2215 {
2216         struct dasd_eckd_private *private;
2217         struct dasd_ccw_req *cqr;
2218         struct req_iterator iter;
2219         struct bio_vec *bv;
2220         char *dst;
2221         unsigned int trkcount, ctidaw;
2222         unsigned char cmd;
2223         struct dasd_device *basedev;
2224         unsigned int tlf;
2225         struct itcw *itcw;
2226         struct tidaw *last_tidaw = NULL;
2227         int itcw_op;
2228         size_t itcw_size;
2229
2230         basedev = block->base;
2231         private = (struct dasd_eckd_private *) basedev->private;
2232         if (rq_data_dir(req) == READ) {
2233                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2234                 itcw_op = ITCW_OP_READ;
2235         } else if (rq_data_dir(req) == WRITE) {
2236                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2237                 itcw_op = ITCW_OP_WRITE;
2238         } else
2239                 return ERR_PTR(-EINVAL);
2240
2241         /* trackbased I/O needs address all memory via TIDAWs,
2242          * not just for 64 bit addresses. This allows us to map
2243          * each segment directly to one tidaw.
2244          */
2245         trkcount = last_trk - first_trk + 1;
2246         ctidaw = 0;
2247         rq_for_each_segment(bv, req, iter) {
2248                 ++ctidaw;
2249         }
2250
2251         /* Allocate the ccw request. */
2252         itcw_size = itcw_calc_size(0, ctidaw, 0);
2253         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2254                                    0, itcw_size, startdev);
2255         if (IS_ERR(cqr))
2256                 return cqr;
2257
2258         cqr->cpmode = 1;
2259         cqr->startdev = startdev;
2260         cqr->memdev = startdev;
2261         cqr->block = block;
2262         cqr->expires = 100*HZ;
2263         cqr->buildclk = get_clock();
2264         cqr->status = DASD_CQR_FILLED;
2265         cqr->retries = 10;
2266
2267         /* transfer length factor: how many bytes to read from the last track */
2268         if (first_trk == last_trk)
2269                 tlf = last_offs - first_offs + 1;
2270         else
2271                 tlf = last_offs + 1;
2272         tlf *= blksize;
2273
2274         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
2275         cqr->cpaddr = itcw_get_tcw(itcw);
2276
2277         if (prepare_itcw(itcw, first_trk, last_trk,
2278                          cmd, basedev, startdev,
2279                          first_offs + 1,
2280                          trkcount, blksize,
2281                          (last_rec - first_rec + 1) * blksize,
2282                          tlf, blk_per_trk) == -EAGAIN) {
2283                 /* Clock not in sync and XRC is enabled.
2284                  * Try again later.
2285                  */
2286                 dasd_sfree_request(cqr, startdev);
2287                 return ERR_PTR(-EAGAIN);
2288         }
2289
2290         /*
2291          * A tidaw can address 4k of memory, but must not cross page boundaries
2292          * We can let the block layer handle this by setting
2293          * blk_queue_segment_boundary to page boundaries and
2294          * blk_max_segment_size to page size when setting up the request queue.
2295          */
2296         rq_for_each_segment(bv, req, iter) {
2297                 dst = page_address(bv->bv_page) + bv->bv_offset;
2298                 last_tidaw = itcw_add_tidaw(itcw, 0x00, dst, bv->bv_len);
2299                 if (IS_ERR(last_tidaw))
2300                         return (struct dasd_ccw_req *)last_tidaw;
2301         }
2302
2303         last_tidaw->flags |= 0x80;
2304         itcw_finalize(itcw);
2305
2306         if (blk_noretry_request(req) ||
2307             block->base->features & DASD_FEATURE_FAILFAST)
2308                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2309         cqr->startdev = startdev;
2310         cqr->memdev = startdev;
2311         cqr->block = block;
2312         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
2313         cqr->lpm = private->path_data.ppm;
2314         cqr->retries = 256;
2315         cqr->buildclk = get_clock();
2316         cqr->status = DASD_CQR_FILLED;
2317         return cqr;
2318 }
2319
2320 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
2321                                                struct dasd_block *block,
2322                                                struct request *req)
2323 {
2324         int tpm, cmdrtd, cmdwtd;
2325         int use_prefix;
2326 #if defined(CONFIG_64BIT)
2327         int fcx_in_css, fcx_in_gneq, fcx_in_features;
2328 #endif
2329         struct dasd_eckd_private *private;
2330         struct dasd_device *basedev;
2331         sector_t first_rec, last_rec;
2332         sector_t first_trk, last_trk;
2333         unsigned int first_offs, last_offs;
2334         unsigned int blk_per_trk, blksize;
2335         int cdlspecial;
2336         struct dasd_ccw_req *cqr;
2337
2338         basedev = block->base;
2339         private = (struct dasd_eckd_private *) basedev->private;
2340
2341         /* Calculate number of blocks/records per track. */
2342         blksize = block->bp_block;
2343         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2344         /* Calculate record id of first and last block. */
2345         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
2346         first_offs = sector_div(first_trk, blk_per_trk);
2347         last_rec = last_trk =
2348                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
2349         last_offs = sector_div(last_trk, blk_per_trk);
2350         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
2351
2352         /* is transport mode supported? */
2353 #if defined(CONFIG_64BIT)
2354         fcx_in_css = css_general_characteristics.fcx;
2355         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
2356         fcx_in_features = private->features.feature[40] & 0x80;
2357         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
2358 #else
2359         tpm = 0;
2360 #endif
2361
2362         /* is read track data and write track data in command mode supported? */
2363         cmdrtd = private->features.feature[9] & 0x20;
2364         cmdwtd = private->features.feature[12] & 0x40;
2365         use_prefix = private->features.feature[8] & 0x01;
2366
2367         cqr = NULL;
2368         if (cdlspecial || dasd_page_cache) {
2369                 /* do nothing, just fall through to the cmd mode single case */
2370         } else if (!dasd_nofcx && tpm && (first_trk == last_trk)) {
2371                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
2372                                                     first_rec, last_rec,
2373                                                     first_trk, last_trk,
2374                                                     first_offs, last_offs,
2375                                                     blk_per_trk, blksize);
2376                 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
2377                         cqr = NULL;
2378         } else if (use_prefix &&
2379                    (((rq_data_dir(req) == READ) && cmdrtd) ||
2380                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
2381                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
2382                                                    first_rec, last_rec,
2383                                                    first_trk, last_trk,
2384                                                    first_offs, last_offs,
2385                                                    blk_per_trk, blksize);
2386                 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
2387                         cqr = NULL;
2388         }
2389         if (!cqr)
2390                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
2391                                                     first_rec, last_rec,
2392                                                     first_trk, last_trk,
2393                                                     first_offs, last_offs,
2394                                                     blk_per_trk, blksize);
2395         return cqr;
2396 }
2397
2398 static int
2399 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
2400 {
2401         struct dasd_eckd_private *private;
2402         struct ccw1 *ccw;
2403         struct req_iterator iter;
2404         struct bio_vec *bv;
2405         char *dst, *cda;
2406         unsigned int blksize, blk_per_trk, off;
2407         sector_t recid;
2408         int status;
2409
2410         if (!dasd_page_cache)
2411                 goto out;
2412         private = (struct dasd_eckd_private *) cqr->block->base->private;
2413         blksize = cqr->block->bp_block;
2414         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2415         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
2416         ccw = cqr->cpaddr;
2417         /* Skip over define extent & locate record. */
2418         ccw++;
2419         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
2420                 ccw++;
2421         rq_for_each_segment(bv, req, iter) {
2422                 dst = page_address(bv->bv_page) + bv->bv_offset;
2423                 for (off = 0; off < bv->bv_len; off += blksize) {
2424                         /* Skip locate record. */
2425                         if (private->uses_cdl && recid <= 2*blk_per_trk)
2426                                 ccw++;
2427                         if (dst) {
2428                                 if (ccw->flags & CCW_FLAG_IDA)
2429                                         cda = *((char **)((addr_t) ccw->cda));
2430                                 else
2431                                         cda = (char *)((addr_t) ccw->cda);
2432                                 if (dst != cda) {
2433                                         if (rq_data_dir(req) == READ)
2434                                                 memcpy(dst, cda, bv->bv_len);
2435                                         kmem_cache_free(dasd_page_cache,
2436                                             (void *)((addr_t)cda & PAGE_MASK));
2437                                 }
2438                                 dst = NULL;
2439                         }
2440                         ccw++;
2441                         recid++;
2442                 }
2443         }
2444 out:
2445         status = cqr->status == DASD_CQR_DONE;
2446         dasd_sfree_request(cqr, cqr->memdev);
2447         return status;
2448 }
2449
2450 /*
2451  * Modify ccw/tcw in cqr so it can be started on a base device.
2452  *
2453  * Note that this is not enough to restart the cqr!
2454  * Either reset cqr->startdev as well (summary unit check handling)
2455  * or restart via separate cqr (as in ERP handling).
2456  */
2457 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
2458 {
2459         struct ccw1 *ccw;
2460         struct PFX_eckd_data *pfxdata;
2461         struct tcw *tcw;
2462         struct tccb *tccb;
2463         struct dcw *dcw;
2464
2465         if (cqr->cpmode == 1) {
2466                 tcw = cqr->cpaddr;
2467                 tccb = tcw_get_tccb(tcw);
2468                 dcw = (struct dcw *)&tccb->tca[0];
2469                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
2470                 pfxdata->validity.verify_base = 0;
2471                 pfxdata->validity.hyper_pav = 0;
2472         } else {
2473                 ccw = cqr->cpaddr;
2474                 pfxdata = cqr->data;
2475                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
2476                         pfxdata->validity.verify_base = 0;
2477                         pfxdata->validity.hyper_pav = 0;
2478                 }
2479         }
2480 }
2481
2482 #define DASD_ECKD_CHANQ_MAX_SIZE 4
2483
2484 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
2485                                                      struct dasd_block *block,
2486                                                      struct request *req)
2487 {
2488         struct dasd_eckd_private *private;
2489         struct dasd_device *startdev;
2490         unsigned long flags;
2491         struct dasd_ccw_req *cqr;
2492
2493         startdev = dasd_alias_get_start_dev(base);
2494         if (!startdev)
2495                 startdev = base;
2496         private = (struct dasd_eckd_private *) startdev->private;
2497         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
2498                 return ERR_PTR(-EBUSY);
2499
2500         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
2501         private->count++;
2502         cqr = dasd_eckd_build_cp(startdev, block, req);
2503         if (IS_ERR(cqr))
2504                 private->count--;
2505         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
2506         return cqr;
2507 }
2508
2509 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
2510                                    struct request *req)
2511 {
2512         struct dasd_eckd_private *private;
2513         unsigned long flags;
2514
2515         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
2516         private = (struct dasd_eckd_private *) cqr->memdev->private;
2517         private->count--;
2518         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
2519         return dasd_eckd_free_cp(cqr, req);
2520 }
2521
2522 static int
2523 dasd_eckd_fill_info(struct dasd_device * device,
2524                     struct dasd_information2_t * info)
2525 {
2526         struct dasd_eckd_private *private;
2527
2528         private = (struct dasd_eckd_private *) device->private;
2529         info->label_block = 2;
2530         info->FBA_layout = private->uses_cdl ? 0 : 1;
2531         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
2532         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
2533         memcpy(info->characteristics, &private->rdc_data,
2534                sizeof(struct dasd_eckd_characteristics));
2535         info->confdata_size = min((unsigned long)private->conf_len,
2536                                   sizeof(info->configuration_data));
2537         memcpy(info->configuration_data, private->conf_data,
2538                info->confdata_size);
2539         return 0;
2540 }
2541
2542 /*
2543  * SECTION: ioctl functions for eckd devices.
2544  */
2545
2546 /*
2547  * Release device ioctl.
2548  * Buils a channel programm to releases a prior reserved
2549  * (see dasd_eckd_reserve) device.
2550  */
2551 static int
2552 dasd_eckd_release(struct dasd_device *device)
2553 {
2554         struct dasd_ccw_req *cqr;
2555         int rc;
2556         struct ccw1 *ccw;
2557
2558         if (!capable(CAP_SYS_ADMIN))
2559                 return -EACCES;
2560
2561         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2562                                    1, 32, device);
2563         if (IS_ERR(cqr)) {
2564                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2565                             "Could not allocate initialization request");
2566                 return PTR_ERR(cqr);
2567         }
2568         ccw = cqr->cpaddr;
2569         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
2570         ccw->flags |= CCW_FLAG_SLI;
2571         ccw->count = 32;
2572         ccw->cda = (__u32)(addr_t) cqr->data;
2573         cqr->startdev = device;
2574         cqr->memdev = device;
2575         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2576         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2577         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2578         cqr->expires = 2 * HZ;
2579         cqr->buildclk = get_clock();
2580         cqr->status = DASD_CQR_FILLED;
2581
2582         rc = dasd_sleep_on_immediatly(cqr);
2583
2584         dasd_sfree_request(cqr, cqr->memdev);
2585         return rc;
2586 }
2587
2588 /*
2589  * Reserve device ioctl.
2590  * Options are set to 'synchronous wait for interrupt' and
2591  * 'timeout the request'. This leads to a terminate IO if
2592  * the interrupt is outstanding for a certain time.
2593  */
2594 static int
2595 dasd_eckd_reserve(struct dasd_device *device)
2596 {
2597         struct dasd_ccw_req *cqr;
2598         int rc;
2599         struct ccw1 *ccw;
2600
2601         if (!capable(CAP_SYS_ADMIN))
2602                 return -EACCES;
2603
2604         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2605                                    1, 32, device);
2606         if (IS_ERR(cqr)) {
2607                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2608                             "Could not allocate initialization request");
2609                 return PTR_ERR(cqr);
2610         }
2611         ccw = cqr->cpaddr;
2612         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
2613         ccw->flags |= CCW_FLAG_SLI;
2614         ccw->count = 32;
2615         ccw->cda = (__u32)(addr_t) cqr->data;
2616         cqr->startdev = device;
2617         cqr->memdev = device;
2618         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2619         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2620         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2621         cqr->expires = 2 * HZ;
2622         cqr->buildclk = get_clock();
2623         cqr->status = DASD_CQR_FILLED;
2624
2625         rc = dasd_sleep_on_immediatly(cqr);
2626
2627         dasd_sfree_request(cqr, cqr->memdev);
2628         return rc;
2629 }
2630
2631 /*
2632  * Steal lock ioctl - unconditional reserve device.
2633  * Buils a channel programm to break a device's reservation.
2634  * (unconditional reserve)
2635  */
2636 static int
2637 dasd_eckd_steal_lock(struct dasd_device *device)
2638 {
2639         struct dasd_ccw_req *cqr;
2640         int rc;
2641         struct ccw1 *ccw;
2642
2643         if (!capable(CAP_SYS_ADMIN))
2644                 return -EACCES;
2645
2646         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2647                                    1, 32, device);
2648         if (IS_ERR(cqr)) {
2649                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2650                             "Could not allocate initialization request");
2651                 return PTR_ERR(cqr);
2652         }
2653         ccw = cqr->cpaddr;
2654         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
2655         ccw->flags |= CCW_FLAG_SLI;
2656         ccw->count = 32;
2657         ccw->cda = (__u32)(addr_t) cqr->data;
2658         cqr->startdev = device;
2659         cqr->memdev = device;
2660         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
2661         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2662         cqr->retries = 2;       /* set retry counter to enable basic ERP */
2663         cqr->expires = 2 * HZ;
2664         cqr->buildclk = get_clock();
2665         cqr->status = DASD_CQR_FILLED;
2666
2667         rc = dasd_sleep_on_immediatly(cqr);
2668
2669         dasd_sfree_request(cqr, cqr->memdev);
2670         return rc;
2671 }
2672
2673 /*
2674  * Read performance statistics
2675  */
2676 static int
2677 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
2678 {
2679         struct dasd_psf_prssd_data *prssdp;
2680         struct dasd_rssd_perf_stats_t *stats;
2681         struct dasd_ccw_req *cqr;
2682         struct ccw1 *ccw;
2683         int rc;
2684
2685         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
2686                                    1 /* PSF */  + 1 /* RSSD */ ,
2687                                    (sizeof(struct dasd_psf_prssd_data) +
2688                                     sizeof(struct dasd_rssd_perf_stats_t)),
2689                                    device);
2690         if (IS_ERR(cqr)) {
2691                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2692                             "Could not allocate initialization request");
2693                 return PTR_ERR(cqr);
2694         }
2695         cqr->startdev = device;
2696         cqr->memdev = device;
2697         cqr->retries = 0;
2698         cqr->expires = 10 * HZ;
2699
2700         /* Prepare for Read Subsystem Data */
2701         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
2702         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
2703         prssdp->order = PSF_ORDER_PRSSD;
2704         prssdp->suborder = 0x01;        /* Performance Statistics */
2705         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
2706
2707         ccw = cqr->cpaddr;
2708         ccw->cmd_code = DASD_ECKD_CCW_PSF;
2709         ccw->count = sizeof(struct dasd_psf_prssd_data);
2710         ccw->flags |= CCW_FLAG_CC;
2711         ccw->cda = (__u32)(addr_t) prssdp;
2712
2713         /* Read Subsystem Data - Performance Statistics */
2714         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
2715         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
2716
2717         ccw++;
2718         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
2719         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
2720         ccw->cda = (__u32)(addr_t) stats;
2721
2722         cqr->buildclk = get_clock();
2723         cqr->status = DASD_CQR_FILLED;
2724         rc = dasd_sleep_on(cqr);
2725         if (rc == 0) {
2726                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
2727                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
2728                 if (copy_to_user(argp, stats,
2729                                  sizeof(struct dasd_rssd_perf_stats_t)))
2730                         rc = -EFAULT;
2731         }
2732         dasd_sfree_request(cqr, cqr->memdev);
2733         return rc;
2734 }
2735
2736 /*
2737  * Get attributes (cache operations)
2738  * Returnes the cache attributes used in Define Extend (DE).
2739  */
2740 static int
2741 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
2742 {
2743         struct dasd_eckd_private *private =
2744                 (struct dasd_eckd_private *)device->private;
2745         struct attrib_data_t attrib = private->attrib;
2746         int rc;
2747
2748         if (!capable(CAP_SYS_ADMIN))
2749                 return -EACCES;
2750         if (!argp)
2751                 return -EINVAL;
2752
2753         rc = 0;
2754         if (copy_to_user(argp, (long *) &attrib,
2755                          sizeof(struct attrib_data_t)))
2756                 rc = -EFAULT;
2757
2758         return rc;
2759 }
2760
2761 /*
2762  * Set attributes (cache operations)
2763  * Stores the attributes for cache operation to be used in Define Extend (DE).
2764  */
2765 static int
2766 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
2767 {
2768         struct dasd_eckd_private *private =
2769                 (struct dasd_eckd_private *)device->private;
2770         struct attrib_data_t attrib;
2771
2772         if (!capable(CAP_SYS_ADMIN))
2773                 return -EACCES;
2774         if (!argp)
2775                 return -EINVAL;
2776
2777         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
2778                 return -EFAULT;
2779         private->attrib = attrib;
2780
2781         dev_info(&device->cdev->dev,
2782                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
2783                  private->attrib.operation, private->attrib.nr_cyl);
2784         return 0;
2785 }
2786
2787 /*
2788  * Issue syscall I/O to EMC Symmetrix array.
2789  * CCWs are PSF and RSSD
2790  */
2791 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
2792 {
2793         struct dasd_symmio_parms usrparm;
2794         char *psf_data, *rssd_result;
2795         struct dasd_ccw_req *cqr;
2796         struct ccw1 *ccw;
2797         int rc;
2798
2799         /* Copy parms from caller */
2800         rc = -EFAULT;
2801         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
2802                 goto out;
2803 #ifndef CONFIG_64BIT
2804         /* Make sure pointers are sane even on 31 bit. */
2805         if ((usrparm.psf_data >> 32) != 0 || (usrparm.rssd_result >> 32) != 0) {
2806                 rc = -EINVAL;
2807                 goto out;
2808         }
2809 #endif
2810         /* alloc I/O data area */
2811         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
2812         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
2813         if (!psf_data || !rssd_result) {
2814                 rc = -ENOMEM;
2815                 goto out_free;
2816         }
2817
2818         /* get syscall header from user space */
2819         rc = -EFAULT;
2820         if (copy_from_user(psf_data,
2821                            (void __user *)(unsigned long) usrparm.psf_data,
2822                            usrparm.psf_data_len))
2823                 goto out_free;
2824
2825         /* sanity check on syscall header */
2826         if (psf_data[0] != 0x17 && psf_data[1] != 0xce) {
2827                 rc = -EINVAL;
2828                 goto out_free;
2829         }
2830
2831         /* setup CCWs for PSF + RSSD */
2832         cqr = dasd_smalloc_request("ECKD", 2 , 0, device);
2833         if (IS_ERR(cqr)) {
2834                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2835                         "Could not allocate initialization request");
2836                 rc = PTR_ERR(cqr);
2837                 goto out_free;
2838         }
2839
2840         cqr->startdev = device;
2841         cqr->memdev = device;
2842         cqr->retries = 3;
2843         cqr->expires = 10 * HZ;
2844         cqr->buildclk = get_clock();
2845         cqr->status = DASD_CQR_FILLED;
2846
2847         /* Build the ccws */
2848         ccw = cqr->cpaddr;
2849
2850         /* PSF ccw */
2851         ccw->cmd_code = DASD_ECKD_CCW_PSF;
2852         ccw->count = usrparm.psf_data_len;
2853         ccw->flags |= CCW_FLAG_CC;
2854         ccw->cda = (__u32)(addr_t) psf_data;
2855
2856         ccw++;
2857
2858         /* RSSD ccw  */
2859         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
2860         ccw->count = usrparm.rssd_result_len;
2861         ccw->flags = CCW_FLAG_SLI ;
2862         ccw->cda = (__u32)(addr_t) rssd_result;
2863
2864         rc = dasd_sleep_on(cqr);
2865         if (rc)
2866                 goto out_sfree;
2867
2868         rc = -EFAULT;
2869         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
2870                            rssd_result, usrparm.rssd_result_len))
2871                 goto out_sfree;
2872         rc = 0;
2873
2874 out_sfree:
2875         dasd_sfree_request(cqr, cqr->memdev);
2876 out_free:
2877         kfree(rssd_result);
2878         kfree(psf_data);
2879 out:
2880         DBF_DEV_EVENT(DBF_WARNING, device, "Symmetrix ioctl: rc=%d", rc);
2881         return rc;
2882 }
2883
2884 static int
2885 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
2886 {
2887         struct dasd_device *device = block->base;
2888
2889         switch (cmd) {
2890         case BIODASDGATTR:
2891                 return dasd_eckd_get_attrib(device, argp);
2892         case BIODASDSATTR:
2893                 return dasd_eckd_set_attrib(device, argp);
2894         case BIODASDPSRD:
2895                 return dasd_eckd_performance(device, argp);
2896         case BIODASDRLSE:
2897                 return dasd_eckd_release(device);
2898         case BIODASDRSRV:
2899                 return dasd_eckd_reserve(device);
2900         case BIODASDSLCK:
2901                 return dasd_eckd_steal_lock(device);
2902         case BIODASDSYMMIO:
2903                 return dasd_symm_io(device, argp);
2904         default:
2905                 return -ENOIOCTLCMD;
2906         }
2907 }
2908
2909 /*
2910  * Dump the range of CCWs into 'page' buffer
2911  * and return number of printed chars.
2912  */
2913 static int
2914 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
2915 {
2916         int len, count;
2917         char *datap;
2918
2919         len = 0;
2920         while (from <= to) {
2921                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2922                                " CCW %p: %08X %08X DAT:",
2923                                from, ((int *) from)[0], ((int *) from)[1]);
2924
2925                 /* get pointer to data (consider IDALs) */
2926                 if (from->flags & CCW_FLAG_IDA)
2927                         datap = (char *) *((addr_t *) (addr_t) from->cda);
2928                 else
2929                         datap = (char *) ((addr_t) from->cda);
2930
2931                 /* dump data (max 32 bytes) */
2932                 for (count = 0; count < from->count && count < 32; count++) {
2933                         if (count % 8 == 0) len += sprintf(page + len, " ");
2934                         if (count % 4 == 0) len += sprintf(page + len, " ");
2935                         len += sprintf(page + len, "%02x", datap[count]);
2936                 }
2937                 len += sprintf(page + len, "\n");
2938                 from++;
2939         }
2940         return len;
2941 }
2942
2943 static void
2944 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct dasd_ccw_req *req,
2945                          struct irb *irb, char *reason)
2946 {
2947         u64 *sense;
2948         int sl;
2949         struct tsb *tsb;
2950
2951         sense = NULL;
2952         tsb = NULL;
2953         if (req && scsw_is_tm(&req->irb.scsw)) {
2954                 if (irb->scsw.tm.tcw)
2955                         tsb = tcw_get_tsb(
2956                                 (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
2957                 if (tsb && (irb->scsw.tm.fcxs == 0x01)) {
2958                         switch (tsb->flags & 0x07) {
2959                         case 1: /* tsa_iostat */
2960                                 sense = (u64 *)tsb->tsa.iostat.sense;
2961                         break;
2962                         case 2: /* ts_ddpc */
2963                                 sense = (u64 *)tsb->tsa.ddpc.sense;
2964                         break;
2965                         case 3: /* tsa_intrg */
2966                         break;
2967                         }
2968                 }
2969         } else {
2970                 if (irb->esw.esw0.erw.cons)
2971                         sense = (u64 *)irb->ecw;
2972         }
2973         if (sense) {
2974                 for (sl = 0; sl < 4; sl++) {
2975                         DBF_DEV_EVENT(DBF_EMERG, device,
2976                                       "%s: %016llx %016llx %016llx %016llx",
2977                                       reason, sense[0], sense[1], sense[2],
2978                                       sense[3]);
2979                 }
2980         } else {
2981                 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
2982                               "SORRY - NO VALID SENSE AVAILABLE\n");
2983         }
2984 }
2985
2986 /*
2987  * Print sense data and related channel program.
2988  * Parts are printed because printk buffer is only 1024 bytes.
2989  */
2990 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
2991                                  struct dasd_ccw_req *req, struct irb *irb)
2992 {
2993         char *page;
2994         struct ccw1 *first, *last, *fail, *from, *to;
2995         int len, sl, sct;
2996
2997         page = (char *) get_zeroed_page(GFP_ATOMIC);
2998         if (page == NULL) {
2999                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3000                               "No memory to dump sense data\n");
3001                 return;
3002         }
3003         /* dump the sense data */
3004         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3005                       " I/O status report for device %s:\n",
3006                       dev_name(&device->cdev->dev));
3007         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3008                        " in req: %p CS: 0x%02X DS: 0x%02X CC: 0x%02X RC: %d\n",
3009                        req, scsw_cstat(&irb->scsw), scsw_dstat(&irb->scsw),
3010                        scsw_cc(&irb->scsw), req->intrc);
3011         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3012                        " device %s: Failing CCW: %p\n",
3013                        dev_name(&device->cdev->dev),
3014                        (void *) (addr_t) irb->scsw.cmd.cpa);
3015         if (irb->esw.esw0.erw.cons) {
3016                 for (sl = 0; sl < 4; sl++) {
3017                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3018                                        " Sense(hex) %2d-%2d:",
3019                                        (8 * sl), ((8 * sl) + 7));
3020
3021                         for (sct = 0; sct < 8; sct++) {
3022                                 len += sprintf(page + len, " %02x",
3023                                                irb->ecw[8 * sl + sct]);
3024                         }
3025                         len += sprintf(page + len, "\n");
3026                 }
3027
3028                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
3029                         /* 24 Byte Sense Data */
3030                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3031                                 " 24 Byte: %x MSG %x, "
3032                                 "%s MSGb to SYSOP\n",
3033                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
3034                                 irb->ecw[1] & 0x10 ? "" : "no");
3035                 } else {
3036                         /* 32 Byte Sense Data */
3037                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3038                                 " 32 Byte: Format: %x "
3039                                 "Exception class %x\n",
3040                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
3041                 }
3042         } else {
3043                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3044                         " SORRY - NO VALID SENSE AVAILABLE\n");
3045         }
3046         printk("%s", page);
3047
3048         if (req) {
3049                 /* req == NULL for unsolicited interrupts */
3050                 /* dump the Channel Program (max 140 Bytes per line) */
3051                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
3052                 first = req->cpaddr;
3053                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
3054                 to = min(first + 6, last);
3055                 len = sprintf(page,  KERN_ERR PRINTK_HEADER
3056                               " Related CP in req: %p\n", req);
3057                 dasd_eckd_dump_ccw_range(first, to, page + len);
3058                 printk("%s", page);
3059
3060                 /* print failing CCW area (maximum 4) */
3061                 /* scsw->cda is either valid or zero  */
3062                 len = 0;
3063                 from = ++to;
3064                 fail = (struct ccw1 *)(addr_t)
3065                                 irb->scsw.cmd.cpa; /* failing CCW */
3066                 if (from <  fail - 2) {
3067                         from = fail - 2;     /* there is a gap - print header */
3068                         len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
3069                 }
3070                 to = min(fail + 1, last);
3071                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
3072
3073                 /* print last CCWs (maximum 2) */
3074                 from = max(from, ++to);
3075                 if (from < last - 1) {
3076                         from = last - 1;     /* there is a gap - print header */
3077                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
3078                 }
3079                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
3080                 if (len > 0)
3081                         printk("%s", page);
3082         }
3083         free_page((unsigned long) page);
3084 }
3085
3086
3087 /*
3088  * Print sense data from a tcw.
3089  */
3090 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
3091                                  struct dasd_ccw_req *req, struct irb *irb)
3092 {
3093         char *page;
3094         int len, sl, sct, residual;
3095
3096         struct tsb *tsb;
3097         u8 *sense;
3098
3099
3100         page = (char *) get_zeroed_page(GFP_ATOMIC);
3101         if (page == NULL) {
3102                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
3103                             "No memory to dump sense data");
3104                 return;
3105         }
3106         /* dump the sense data */
3107         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3108                       " I/O status report for device %s:\n",
3109                       dev_name(&device->cdev->dev));
3110         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3111                        " in req: %p CS: 0x%02X DS: 0x%02X CC: 0x%02X RC: %d "
3112                        "fcxs: 0x%02X schxs: 0x%02X\n", req,
3113                        scsw_cstat(&irb->scsw), scsw_dstat(&irb->scsw),
3114                        scsw_cc(&irb->scsw), req->intrc,
3115                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs);
3116         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3117                        " device %s: Failing TCW: %p\n",
3118                        dev_name(&device->cdev->dev),
3119                        (void *) (addr_t) irb->scsw.tm.tcw);
3120
3121         tsb = NULL;
3122         sense = NULL;
3123         if (irb->scsw.tm.tcw)
3124                 tsb = tcw_get_tsb(
3125                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
3126
3127         if (tsb && (irb->scsw.tm.fcxs == 0x01)) {
3128                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3129                                " tsb->length %d\n", tsb->length);
3130                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3131                                " tsb->flags %x\n", tsb->flags);
3132                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3133                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
3134                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3135                                " tsb->count %d\n", tsb->count);
3136                 residual = tsb->count - 28;
3137                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3138                                " residual %d\n", residual);
3139
3140                 switch (tsb->flags & 0x07) {
3141                 case 1: /* tsa_iostat */
3142                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3143                                " tsb->tsa.iostat.dev_time %d\n",
3144                                        tsb->tsa.iostat.dev_time);
3145                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3146                                " tsb->tsa.iostat.def_time %d\n",
3147                                        tsb->tsa.iostat.def_time);
3148                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3149                                " tsb->tsa.iostat.queue_time %d\n",
3150                                        tsb->tsa.iostat.queue_time);
3151                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3152                                " tsb->tsa.iostat.dev_busy_time %d\n",
3153                                        tsb->tsa.iostat.dev_busy_time);
3154                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3155                                " tsb->tsa.iostat.dev_act_time %d\n",
3156                                        tsb->tsa.iostat.dev_act_time);
3157                         sense = tsb->tsa.iostat.sense;
3158                         break;
3159                 case 2: /* ts_ddpc */
3160                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3161                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
3162                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3163                                " tsb->tsa.ddpc.rcq:  ");
3164                         for (sl = 0; sl < 16; sl++) {
3165                                 for (sct = 0; sct < 8; sct++) {
3166                                         len += sprintf(page + len, " %02x",
3167                                                        tsb->tsa.ddpc.rcq[sl]);
3168                                 }
3169                                 len += sprintf(page + len, "\n");
3170                         }
3171                         sense = tsb->tsa.ddpc.sense;
3172                         break;
3173                 case 3: /* tsa_intrg */
3174                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3175                                       " tsb->tsa.intrg.: not supportet yet \n");
3176                         break;
3177                 }
3178
3179                 if (sense) {
3180                         for (sl = 0; sl < 4; sl++) {
3181                                 len += sprintf(page + len,
3182                                                KERN_ERR PRINTK_HEADER
3183                                                " Sense(hex) %2d-%2d:",
3184                                                (8 * sl), ((8 * sl) + 7));
3185                                 for (sct = 0; sct < 8; sct++) {
3186                                         len += sprintf(page + len, " %02x",
3187                                                        sense[8 * sl + sct]);
3188                                 }
3189                                 len += sprintf(page + len, "\n");
3190                         }
3191
3192                         if (sense[27] & DASD_SENSE_BIT_0) {
3193                                 /* 24 Byte Sense Data */
3194                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3195                                         " 24 Byte: %x MSG %x, "
3196                                         "%s MSGb to SYSOP\n",
3197                                         sense[7] >> 4, sense[7] & 0x0f,
3198                                         sense[1] & 0x10 ? "" : "no");
3199                         } else {
3200                                 /* 32 Byte Sense Data */
3201                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3202                                         " 32 Byte: Format: %x "
3203                                         "Exception class %x\n",
3204                                         sense[6] & 0x0f, sense[22] >> 4);
3205                         }
3206                 } else {
3207                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3208                                 " SORRY - NO VALID SENSE AVAILABLE\n");
3209                 }
3210         } else {
3211                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3212                         " SORRY - NO TSB DATA AVAILABLE\n");
3213         }
3214         printk("%s", page);
3215         free_page((unsigned long) page);
3216 }
3217
3218 static void dasd_eckd_dump_sense(struct dasd_device *device,
3219                                  struct dasd_ccw_req *req, struct irb *irb)
3220 {
3221         if (req && scsw_is_tm(&req->irb.scsw))
3222                 dasd_eckd_dump_sense_tcw(device, req, irb);
3223         else
3224                 dasd_eckd_dump_sense_ccw(device, req, irb);
3225 }
3226
3227 int dasd_eckd_pm_freeze(struct dasd_device *device)
3228 {
3229         /*
3230          * the device should be disconnected from our LCU structure
3231          * on restore we will reconnect it and reread LCU specific
3232          * information like PAV support that might have changed
3233          */
3234         dasd_alias_remove_device(device);
3235         dasd_alias_disconnect_device_from_lcu(device);
3236
3237         return 0;
3238 }
3239
3240 int dasd_eckd_restore_device(struct dasd_device *device)
3241 {
3242         struct dasd_eckd_private *private;
3243         int is_known, rc;
3244         struct dasd_uid temp_uid;
3245
3246         private = (struct dasd_eckd_private *) device->private;
3247
3248         /* Read Configuration Data */
3249         rc = dasd_eckd_read_conf(device);
3250         if (rc)
3251                 goto out_err;
3252
3253         /* Generate device unique id and register in devmap */
3254         rc = dasd_eckd_generate_uid(device, &private->uid);
3255         dasd_get_uid(device->cdev, &temp_uid);
3256         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
3257                 dev_err(&device->cdev->dev, "The UID of the DASD has changed\n");
3258         if (rc)
3259                 goto out_err;
3260         dasd_set_uid(device->cdev, &private->uid);
3261
3262         /* register lcu with alias handling, enable PAV if this is a new lcu */
3263         is_known = dasd_alias_make_device_known_to_lcu(device);
3264         if (is_known < 0)
3265                 return is_known;
3266         if (!is_known) {
3267                 /* new lcu found */
3268                 rc = dasd_eckd_validate_server(device); /* will switch pav on */
3269                 if (rc)
3270                         goto out_err;
3271         }
3272
3273         /* Read Feature Codes */
3274         rc = dasd_eckd_read_features(device);
3275         if (rc)
3276                 goto out_err;
3277
3278         /* Read Device Characteristics */
3279         memset(&private->rdc_data, 0, sizeof(private->rdc_data));
3280         rc = dasd_generic_read_dev_chars(device, "ECKD",
3281                                          &private->rdc_data, 64);
3282         if (rc) {
3283                 DBF_EVENT(DBF_WARNING,
3284                           "Read device characteristics failed, rc=%d for "
3285                           "device: %s", rc, dev_name(&device->cdev->dev));
3286                 goto out_err;
3287         }
3288
3289         /* add device to alias management */
3290         dasd_alias_add_device(device);
3291
3292         return 0;
3293
3294 out_err:
3295         return -1;
3296 }
3297
3298 static struct ccw_driver dasd_eckd_driver = {
3299         .name        = "dasd-eckd",
3300         .owner       = THIS_MODULE,
3301         .ids         = dasd_eckd_ids,
3302         .probe       = dasd_eckd_probe,
3303         .remove      = dasd_generic_remove,
3304         .set_offline = dasd_generic_set_offline,
3305         .set_online  = dasd_eckd_set_online,
3306         .notify      = dasd_generic_notify,
3307         .freeze      = dasd_generic_pm_freeze,
3308         .thaw        = dasd_generic_restore_device,
3309         .restore     = dasd_generic_restore_device,
3310 };
3311
3312 /*
3313  * max_blocks is dependent on the amount of storage that is available
3314  * in the static io buffer for each device. Currently each device has
3315  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
3316  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
3317  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
3318  * addition we have one define extent ccw + 16 bytes of data and one
3319  * locate record ccw + 16 bytes of data. That makes:
3320  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
3321  * We want to fit two into the available memory so that we can immediately
3322  * start the next request if one finishes off. That makes 249.5 blocks
3323  * for one request. Give a little safety and the result is 240.
3324  */
3325 static struct dasd_discipline dasd_eckd_discipline = {
3326         .owner = THIS_MODULE,
3327         .name = "ECKD",
3328         .ebcname = "ECKD",
3329         .max_blocks = 240,
3330         .check_device = dasd_eckd_check_characteristics,
3331         .uncheck_device = dasd_eckd_uncheck_device,
3332         .do_analysis = dasd_eckd_do_analysis,
3333         .ready_to_online = dasd_eckd_ready_to_online,
3334         .online_to_ready = dasd_eckd_online_to_ready,
3335         .fill_geometry = dasd_eckd_fill_geometry,
3336         .start_IO = dasd_start_IO,
3337         .term_IO = dasd_term_IO,
3338         .handle_terminated_request = dasd_eckd_handle_terminated_request,
3339         .format_device = dasd_eckd_format_device,
3340         .erp_action = dasd_eckd_erp_action,
3341         .erp_postaction = dasd_eckd_erp_postaction,
3342         .handle_unsolicited_interrupt = dasd_eckd_handle_unsolicited_interrupt,
3343         .build_cp = dasd_eckd_build_alias_cp,
3344         .free_cp = dasd_eckd_free_alias_cp,
3345         .dump_sense = dasd_eckd_dump_sense,
3346         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
3347         .fill_info = dasd_eckd_fill_info,
3348         .ioctl = dasd_eckd_ioctl,
3349         .freeze = dasd_eckd_pm_freeze,
3350         .restore = dasd_eckd_restore_device,
3351 };
3352
3353 static int __init
3354 dasd_eckd_init(void)
3355 {
3356         int ret;
3357
3358         ASCEBC(dasd_eckd_discipline.ebcname, 4);
3359         ret = ccw_driver_register(&dasd_eckd_driver);
3360         if (!ret)
3361                 wait_for_device_probe();
3362
3363         return ret;
3364 }
3365
3366 static void __exit
3367 dasd_eckd_cleanup(void)
3368 {
3369         ccw_driver_unregister(&dasd_eckd_driver);
3370 }
3371
3372 module_init(dasd_eckd_init);
3373 module_exit(dasd_eckd_cleanup);