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