drivers/s390/block/dasd_eckd.c

   1 /*
   2  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   3  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   4  *                  Carsten Otte <Cotte@de.ibm.com>
   5  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   6  * Bugreports.to..: <Linux390@de.ibm.com>
   7  * Copyright IBM Corp. 1999, 2009
   8  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
   9  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
  10  */
  11
  12 #define KMSG_COMPONENT "dasd-eckd"
  13
  14 #include <linux/stddef.h>
  15 #include <linux/kernel.h>
  16 #include <linux/slab.h>
  17 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  18 #include <linux/bio.h>
  19 #include <linux/module.h>
  20 #include <linux/compat.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/uaccess.h>
  28 #include <asm/cio.h>
  29 #include <asm/ccwdev.h>
  30 #include <asm/itcw.h>
  31
  32 #include "dasd_int.h"
  33 #include "dasd_eckd.h"
  34 #include "../cio/chsc.h"
  35
  36
  37 #ifdef PRINTK_HEADER
  38 #undef PRINTK_HEADER
  39 #endif                          /* PRINTK_HEADER */
  40 #define PRINTK_HEADER "dasd(eckd):"
  41
  42 #define ECKD_C0(i) (i->home_bytes)
  43 #define ECKD_F(i) (i->formula)
  44 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
  45                     (i->factors.f_0x02.f1))
  46 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
  47                     (i->factors.f_0x02.f2))
  48 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
  49                     (i->factors.f_0x02.f3))
  50 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
  51 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
  52 #define ECKD_F6(i) (i->factor6)
  53 #define ECKD_F7(i) (i->factor7)
  54 #define ECKD_F8(i) (i->factor8)
  55
  56 /*
  57  * raw track access always map to 64k in memory
  58  * so it maps to 16 blocks of 4k per track
  59  */
  60 #define DASD_RAW_BLOCK_PER_TRACK 16
  61 #define DASD_RAW_BLOCKSIZE 4096
  62 /* 64k are 128 x 512 byte sectors  */
  63 #define DASD_RAW_SECTORS_PER_TRACK 128
  64
  65 MODULE_LICENSE("GPL");
  66
  67 static struct dasd_discipline dasd_eckd_discipline;
  68
  69 /* The ccw bus type uses this table to find devices that it sends to
  70  * dasd_eckd_probe */
  71 static struct ccw_device_id dasd_eckd_ids[] = {
  72         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
  73         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
  74         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
  75         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
  76         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
  77         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
  78         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
  79         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
  80         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
  81         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
  82         { /* end of list */ },
  83 };
  84
  85 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  86
  87 static struct ccw_driver dasd_eckd_driver; /* see below */
  88
  89 #define INIT_CQR_OK 0
  90 #define INIT_CQR_UNFORMATTED 1
  91 #define INIT_CQR_ERROR 2
  92
  93 /* emergency request for reserve/release */
  94 static struct {
  95         struct dasd_ccw_req cqr;
  96         struct ccw1 ccw;
  97         char data[32];
  98 } *dasd_reserve_req;
  99 static DEFINE_MUTEX(dasd_reserve_mutex);
 100
 101 /* definitions for the path verification worker */
 102 struct path_verification_work_data {
 103         struct work_struct worker;
 104         struct dasd_device *device;
 105         struct dasd_ccw_req cqr;
 106         struct ccw1 ccw;
 107         __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
 108         int isglobal;
 109         __u8 tbvpm;
 110 };
 111 static struct path_verification_work_data *path_verification_worker;
 112 static DEFINE_MUTEX(dasd_path_verification_mutex);
 113
 114 /* initial attempt at a probe function. this can be simplified once
 115  * the other detection code is gone */
 116 static int
 117 dasd_eckd_probe (struct ccw_device *cdev)
 118 {
 119         int ret;
 120
 121         /* set ECKD specific ccw-device options */
 122         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
 123                                      CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
 124         if (ret) {
 125                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
 126                                 "dasd_eckd_probe: could not set "
 127                                 "ccw-device options");
 128                 return ret;
 129         }
 130         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
 131         return ret;
 132 }
 133
 134 static int
 135 dasd_eckd_set_online(struct ccw_device *cdev)
 136 {
 137         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
 138 }
 139
 140 static const int sizes_trk0[] = { 28, 148, 84 };
 141 #define LABEL_SIZE 140
 142
 143 static inline unsigned int
 144 round_up_multiple(unsigned int no, unsigned int mult)
 145 {
 146         int rem = no % mult;
 147         return (rem ? no - rem + mult : no);
 148 }
 149
 150 static inline unsigned int
 151 ceil_quot(unsigned int d1, unsigned int d2)
 152 {
 153         return (d1 + (d2 - 1)) / d2;
 154 }
 155
 156 static unsigned int
 157 recs_per_track(struct dasd_eckd_characteristics * rdc,
 158                unsigned int kl, unsigned int dl)
 159 {
 160         int dn, kn;
 161
 162         switch (rdc->dev_type) {
 163         case 0x3380:
 164                 if (kl)
 165                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 166                                        ceil_quot(dl + 12, 32));
 167                 else
 168                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 169         case 0x3390:
 170                 dn = ceil_quot(dl + 6, 232) + 1;
 171                 if (kl) {
 172                         kn = ceil_quot(kl + 6, 232) + 1;
 173                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 174                                        9 + ceil_quot(dl + 6 * dn, 34));
 175                 } else
 176                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 177         case 0x9345:
 178                 dn = ceil_quot(dl + 6, 232) + 1;
 179                 if (kl) {
 180                         kn = ceil_quot(kl + 6, 232) + 1;
 181                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 182                                        ceil_quot(dl + 6 * dn, 34));
 183                 } else
 184                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 185         }
 186         return 0;
 187 }
 188
 189 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
 190 {
 191         geo->cyl = (__u16) cyl;
 192         geo->head = cyl >> 16;
 193         geo->head <<= 4;
 194         geo->head |= head;
 195 }
 196
 197 static int
 198 check_XRC (struct ccw1         *de_ccw,
 199            struct DE_eckd_data *data,
 200            struct dasd_device  *device)
 201 {
 202         struct dasd_eckd_private *private;
 203         int rc;
 204
 205         private = (struct dasd_eckd_private *) device->private;
 206         if (!private->rdc_data.facilities.XRC_supported)
 207                 return 0;
 208
 209         /* switch on System Time Stamp - needed for XRC Support */
 210         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 211         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 212
 213         rc = get_sync_clock(&data->ep_sys_time);
 214         /* Ignore return code if sync clock is switched off. */
 215         if (rc == -ENOSYS || rc == -EACCES)
 216                 rc = 0;
 217
 218         de_ccw->count = sizeof(struct DE_eckd_data);
 219         de_ccw->flags |= CCW_FLAG_SLI;
 220         return rc;
 221 }
 222
 223 static int
 224 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
 225               unsigned int totrk, int cmd, struct dasd_device *device)
 226 {
 227         struct dasd_eckd_private *private;
 228         u32 begcyl, endcyl;
 229         u16 heads, beghead, endhead;
 230         int rc = 0;
 231
 232         private = (struct dasd_eckd_private *) device->private;
 233
 234         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 235         ccw->flags = 0;
 236         ccw->count = 16;
 237         ccw->cda = (__u32) __pa(data);
 238
 239         memset(data, 0, sizeof(struct DE_eckd_data));
 240         switch (cmd) {
 241         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 242         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 243         case DASD_ECKD_CCW_READ:
 244         case DASD_ECKD_CCW_READ_MT:
 245         case DASD_ECKD_CCW_READ_CKD:
 246         case DASD_ECKD_CCW_READ_CKD_MT:
 247         case DASD_ECKD_CCW_READ_KD:
 248         case DASD_ECKD_CCW_READ_KD_MT:
 249         case DASD_ECKD_CCW_READ_COUNT:
 250                 data->mask.perm = 0x1;
 251                 data->attributes.operation = private->attrib.operation;
 252                 break;
 253         case DASD_ECKD_CCW_WRITE:
 254         case DASD_ECKD_CCW_WRITE_MT:
 255         case DASD_ECKD_CCW_WRITE_KD:
 256         case DASD_ECKD_CCW_WRITE_KD_MT:
 257                 data->mask.perm = 0x02;
 258                 data->attributes.operation = private->attrib.operation;
 259                 rc = check_XRC (ccw, data, device);
 260                 break;
 261         case DASD_ECKD_CCW_WRITE_CKD:
 262         case DASD_ECKD_CCW_WRITE_CKD_MT:
 263                 data->attributes.operation = DASD_BYPASS_CACHE;
 264                 rc = check_XRC (ccw, data, device);
 265                 break;
 266         case DASD_ECKD_CCW_ERASE:
 267         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 268         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 269                 data->mask.perm = 0x3;
 270                 data->mask.auth = 0x1;
 271                 data->attributes.operation = DASD_BYPASS_CACHE;
 272                 rc = check_XRC (ccw, data, device);
 273                 break;
 274         default:
 275                 dev_err(&device->cdev->dev,
 276                         "0x%x is not a known command\n", cmd);
 277                 break;
 278         }
 279
 280         data->attributes.mode = 0x3;    /* ECKD */
 281
 282         if ((private->rdc_data.cu_type == 0x2105 ||
 283              private->rdc_data.cu_type == 0x2107 ||
 284              private->rdc_data.cu_type == 0x1750)
 285             && !(private->uses_cdl && trk < 2))
 286                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 287
 288         heads = private->rdc_data.trk_per_cyl;
 289         begcyl = trk / heads;
 290         beghead = trk % heads;
 291         endcyl = totrk / heads;
 292         endhead = totrk % heads;
 293
 294         /* check for sequential prestage - enhance cylinder range */
 295         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 296             data->attributes.operation == DASD_SEQ_ACCESS) {
 297
 298                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
 299                         endcyl += private->attrib.nr_cyl;
 300                 else
 301                         endcyl = (private->real_cyl - 1);
 302         }
 303
 304         set_ch_t(&data->beg_ext, begcyl, beghead);
 305         set_ch_t(&data->end_ext, endcyl, endhead);
 306         return rc;
 307 }
 308
 309 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
 310                                struct dasd_device  *device)
 311 {
 312         struct dasd_eckd_private *private;
 313         int rc;
 314
 315         private = (struct dasd_eckd_private *) device->private;
 316         if (!private->rdc_data.facilities.XRC_supported)
 317                 return 0;
 318
 319         /* switch on System Time Stamp - needed for XRC Support */
 320         pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid'   */
 321         pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
 322         pfxdata->validity.time_stamp = 1;           /* 'Time Stamp Valid'   */
 323
 324         rc = get_sync_clock(&pfxdata->define_extent.ep_sys_time);
 325         /* Ignore return code if sync clock is switched off. */
 326         if (rc == -ENOSYS || rc == -EACCES)
 327                 rc = 0;
 328         return rc;
 329 }
 330
 331 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
 332                           unsigned int rec_on_trk, int count, int cmd,
 333                           struct dasd_device *device, unsigned int reclen,
 334                           unsigned int tlf)
 335 {
 336         struct dasd_eckd_private *private;
 337         int sector;
 338         int dn, d;
 339
 340         private = (struct dasd_eckd_private *) device->private;
 341
 342         memset(data, 0, sizeof(*data));
 343         sector = 0;
 344         if (rec_on_trk) {
 345                 switch (private->rdc_data.dev_type) {
 346                 case 0x3390:
 347                         dn = ceil_quot(reclen + 6, 232);
 348                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 349                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 350                         break;
 351                 case 0x3380:
 352                         d = 7 + ceil_quot(reclen + 12, 32);
 353                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 354                         break;
 355                 }
 356         }
 357         data->sector = sector;
 358         /* note: meaning of count depends on the operation
 359          *       for record based I/O it's the number of records, but for
 360          *       track based I/O it's the number of tracks
 361          */
 362         data->count = count;
 363         switch (cmd) {
 364         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 365                 data->operation.orientation = 0x3;
 366                 data->operation.operation = 0x03;
 367                 break;
 368         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 369                 data->operation.orientation = 0x3;
 370                 data->operation.operation = 0x16;
 371                 break;
 372         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 373                 data->operation.orientation = 0x1;
 374                 data->operation.operation = 0x03;
 375                 data->count++;
 376                 break;
 377         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 378                 data->operation.orientation = 0x3;
 379                 data->operation.operation = 0x16;
 380                 data->count++;
 381                 break;
 382         case DASD_ECKD_CCW_WRITE:
 383         case DASD_ECKD_CCW_WRITE_MT:
 384         case DASD_ECKD_CCW_WRITE_KD:
 385         case DASD_ECKD_CCW_WRITE_KD_MT:
 386                 data->auxiliary.length_valid = 0x1;
 387                 data->length = reclen;
 388                 data->operation.operation = 0x01;
 389                 break;
 390         case DASD_ECKD_CCW_WRITE_CKD:
 391         case DASD_ECKD_CCW_WRITE_CKD_MT:
 392                 data->auxiliary.length_valid = 0x1;
 393                 data->length = reclen;
 394                 data->operation.operation = 0x03;
 395                 break;
 396         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 397                 data->operation.orientation = 0x0;
 398                 data->operation.operation = 0x3F;
 399                 data->extended_operation = 0x11;
 400                 data->length = 0;
 401                 data->extended_parameter_length = 0x02;
 402                 if (data->count > 8) {
 403                         data->extended_parameter[0] = 0xFF;
 404                         data->extended_parameter[1] = 0xFF;
 405                         data->extended_parameter[1] <<= (16 - count);
 406                 } else {
 407                         data->extended_parameter[0] = 0xFF;
 408                         data->extended_parameter[0] <<= (8 - count);
 409                         data->extended_parameter[1] = 0x00;
 410                 }
 411                 data->sector = 0xFF;
 412                 break;
 413         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 414                 data->auxiliary.length_valid = 0x1;
 415                 data->length = reclen;  /* not tlf, as one might think */
 416                 data->operation.operation = 0x3F;
 417                 data->extended_operation = 0x23;
 418                 break;
 419         case DASD_ECKD_CCW_READ:
 420         case DASD_ECKD_CCW_READ_MT:
 421         case DASD_ECKD_CCW_READ_KD:
 422         case DASD_ECKD_CCW_READ_KD_MT:
 423                 data->auxiliary.length_valid = 0x1;
 424                 data->length = reclen;
 425                 data->operation.operation = 0x06;
 426                 break;
 427         case DASD_ECKD_CCW_READ_CKD:
 428         case DASD_ECKD_CCW_READ_CKD_MT:
 429                 data->auxiliary.length_valid = 0x1;
 430                 data->length = reclen;
 431                 data->operation.operation = 0x16;
 432                 break;
 433         case DASD_ECKD_CCW_READ_COUNT:
 434                 data->operation.operation = 0x06;
 435                 break;
 436         case DASD_ECKD_CCW_READ_TRACK:
 437                 data->operation.orientation = 0x1;
 438                 data->operation.operation = 0x0C;
 439                 data->extended_parameter_length = 0;
 440                 data->sector = 0xFF;
 441                 break;
 442         case DASD_ECKD_CCW_READ_TRACK_DATA:
 443                 data->auxiliary.length_valid = 0x1;
 444                 data->length = tlf;
 445                 data->operation.operation = 0x0C;
 446                 break;
 447         case DASD_ECKD_CCW_ERASE:
 448                 data->length = reclen;
 449                 data->auxiliary.length_valid = 0x1;
 450                 data->operation.operation = 0x0b;
 451                 break;
 452         default:
 453                 DBF_DEV_EVENT(DBF_ERR, device,
 454                             "fill LRE unknown opcode 0x%x", cmd);
 455                 BUG();
 456         }
 457         set_ch_t(&data->seek_addr,
 458                  trk / private->rdc_data.trk_per_cyl,
 459                  trk % private->rdc_data.trk_per_cyl);
 460         data->search_arg.cyl = data->seek_addr.cyl;
 461         data->search_arg.head = data->seek_addr.head;
 462         data->search_arg.record = rec_on_trk;
 463 }
 464
 465 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 466                       unsigned int trk, unsigned int totrk, int cmd,
 467                       struct dasd_device *basedev, struct dasd_device *startdev,
 468                       unsigned char format, unsigned int rec_on_trk, int count,
 469                       unsigned int blksize, unsigned int tlf)
 470 {
 471         struct dasd_eckd_private *basepriv, *startpriv;
 472         struct DE_eckd_data *dedata;
 473         struct LRE_eckd_data *lredata;
 474         u32 begcyl, endcyl;
 475         u16 heads, beghead, endhead;
 476         int rc = 0;
 477
 478         basepriv = (struct dasd_eckd_private *) basedev->private;
 479         startpriv = (struct dasd_eckd_private *) startdev->private;
 480         dedata = &pfxdata->define_extent;
 481         lredata = &pfxdata->locate_record;
 482
 483         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 484         ccw->flags = 0;
 485         if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
 486                 ccw->count = sizeof(*pfxdata) + 2;
 487                 ccw->cda = (__u32) __pa(pfxdata);
 488                 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
 489         } else {
 490                 ccw->count = sizeof(*pfxdata);
 491                 ccw->cda = (__u32) __pa(pfxdata);
 492                 memset(pfxdata, 0, sizeof(*pfxdata));
 493         }
 494
 495         /* prefix data */
 496         if (format > 1) {
 497                 DBF_DEV_EVENT(DBF_ERR, basedev,
 498                               "PFX LRE unknown format 0x%x", format);
 499                 BUG();
 500                 return -EINVAL;
 501         }
 502         pfxdata->format = format;
 503         pfxdata->base_address = basepriv->ned->unit_addr;
 504         pfxdata->base_lss = basepriv->ned->ID;
 505         pfxdata->validity.define_extent = 1;
 506
 507         /* private uid is kept up to date, conf_data may be outdated */
 508         if (startpriv->uid.type != UA_BASE_DEVICE) {
 509                 pfxdata->validity.verify_base = 1;
 510                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
 511                         pfxdata->validity.hyper_pav = 1;
 512         }
 513
 514         /* define extend data (mostly)*/
 515         switch (cmd) {
 516         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 517         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 518         case DASD_ECKD_CCW_READ:
 519         case DASD_ECKD_CCW_READ_MT:
 520         case DASD_ECKD_CCW_READ_CKD:
 521         case DASD_ECKD_CCW_READ_CKD_MT:
 522         case DASD_ECKD_CCW_READ_KD:
 523         case DASD_ECKD_CCW_READ_KD_MT:
 524         case DASD_ECKD_CCW_READ_COUNT:
 525                 dedata->mask.perm = 0x1;
 526                 dedata->attributes.operation = basepriv->attrib.operation;
 527                 break;
 528         case DASD_ECKD_CCW_READ_TRACK:
 529         case DASD_ECKD_CCW_READ_TRACK_DATA:
 530                 dedata->mask.perm = 0x1;
 531                 dedata->attributes.operation = basepriv->attrib.operation;
 532                 dedata->blk_size = 0;
 533                 break;
 534         case DASD_ECKD_CCW_WRITE:
 535         case DASD_ECKD_CCW_WRITE_MT:
 536         case DASD_ECKD_CCW_WRITE_KD:
 537         case DASD_ECKD_CCW_WRITE_KD_MT:
 538                 dedata->mask.perm = 0x02;
 539                 dedata->attributes.operation = basepriv->attrib.operation;
 540                 rc = check_XRC_on_prefix(pfxdata, basedev);
 541                 break;
 542         case DASD_ECKD_CCW_WRITE_CKD:
 543         case DASD_ECKD_CCW_WRITE_CKD_MT:
 544                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 545                 rc = check_XRC_on_prefix(pfxdata, basedev);
 546                 break;
 547         case DASD_ECKD_CCW_ERASE:
 548         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 549         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 550                 dedata->mask.perm = 0x3;
 551                 dedata->mask.auth = 0x1;
 552                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 553                 rc = check_XRC_on_prefix(pfxdata, basedev);
 554                 break;
 555         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 556                 dedata->mask.perm = 0x03;
 557                 dedata->attributes.operation = basepriv->attrib.operation;
 558                 dedata->blk_size = 0;
 559                 break;
 560         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 561                 dedata->mask.perm = 0x02;
 562                 dedata->attributes.operation = basepriv->attrib.operation;
 563                 dedata->blk_size = blksize;
 564                 rc = check_XRC_on_prefix(pfxdata, basedev);
 565                 break;
 566         default:
 567                 DBF_DEV_EVENT(DBF_ERR, basedev,
 568                             "PFX LRE unknown opcode 0x%x", cmd);
 569                 BUG();
 570                 return -EINVAL;
 571         }
 572
 573         dedata->attributes.mode = 0x3;  /* ECKD */
 574
 575         if ((basepriv->rdc_data.cu_type == 0x2105 ||
 576              basepriv->rdc_data.cu_type == 0x2107 ||
 577              basepriv->rdc_data.cu_type == 0x1750)
 578             && !(basepriv->uses_cdl && trk < 2))
 579                 dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
 580
 581         heads = basepriv->rdc_data.trk_per_cyl;
 582         begcyl = trk / heads;
 583         beghead = trk % heads;
 584         endcyl = totrk / heads;
 585         endhead = totrk % heads;
 586
 587         /* check for sequential prestage - enhance cylinder range */
 588         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
 589             dedata->attributes.operation == DASD_SEQ_ACCESS) {
 590
 591                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
 592                         endcyl += basepriv->attrib.nr_cyl;
 593                 else
 594                         endcyl = (basepriv->real_cyl - 1);
 595         }
 596
 597         set_ch_t(&dedata->beg_ext, begcyl, beghead);
 598         set_ch_t(&dedata->end_ext, endcyl, endhead);
 599
 600         if (format == 1) {
 601                 fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
 602                               basedev, blksize, tlf);
 603         }
 604
 605         return rc;
 606 }
 607
 608 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 609                   unsigned int trk, unsigned int totrk, int cmd,
 610                   struct dasd_device *basedev, struct dasd_device *startdev)
 611 {
 612         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
 613                           0, 0, 0, 0, 0);
 614 }
 615
 616 static void
 617 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
 618               unsigned int rec_on_trk, int no_rec, int cmd,
 619               struct dasd_device * device, int reclen)
 620 {
 621         struct dasd_eckd_private *private;
 622         int sector;
 623         int dn, d;
 624
 625         private = (struct dasd_eckd_private *) device->private;
 626
 627         DBF_DEV_EVENT(DBF_INFO, device,
 628                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 629                   trk, rec_on_trk, no_rec, cmd, reclen);
 630
 631         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 632         ccw->flags = 0;
 633         ccw->count = 16;
 634         ccw->cda = (__u32) __pa(data);
 635
 636         memset(data, 0, sizeof(struct LO_eckd_data));
 637         sector = 0;
 638         if (rec_on_trk) {
 639                 switch (private->rdc_data.dev_type) {
 640                 case 0x3390:
 641                         dn = ceil_quot(reclen + 6, 232);
 642                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 643                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 644                         break;
 645                 case 0x3380:
 646                         d = 7 + ceil_quot(reclen + 12, 32);
 647                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 648                         break;
 649                 }
 650         }
 651         data->sector = sector;
 652         data->count = no_rec;
 653         switch (cmd) {
 654         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 655                 data->operation.orientation = 0x3;
 656                 data->operation.operation = 0x03;
 657                 break;
 658         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 659                 data->operation.orientation = 0x3;
 660                 data->operation.operation = 0x16;
 661                 break;
 662         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 663                 data->operation.orientation = 0x1;
 664                 data->operation.operation = 0x03;
 665                 data->count++;
 666                 break;
 667         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 668                 data->operation.orientation = 0x3;
 669                 data->operation.operation = 0x16;
 670                 data->count++;
 671                 break;
 672         case DASD_ECKD_CCW_WRITE:
 673         case DASD_ECKD_CCW_WRITE_MT:
 674         case DASD_ECKD_CCW_WRITE_KD:
 675         case DASD_ECKD_CCW_WRITE_KD_MT:
 676                 data->auxiliary.last_bytes_used = 0x1;
 677                 data->length = reclen;
 678                 data->operation.operation = 0x01;
 679                 break;
 680         case DASD_ECKD_CCW_WRITE_CKD:
 681         case DASD_ECKD_CCW_WRITE_CKD_MT:
 682                 data->auxiliary.last_bytes_used = 0x1;
 683                 data->length = reclen;
 684                 data->operation.operation = 0x03;
 685                 break;
 686         case DASD_ECKD_CCW_READ:
 687         case DASD_ECKD_CCW_READ_MT:
 688         case DASD_ECKD_CCW_READ_KD:
 689         case DASD_ECKD_CCW_READ_KD_MT:
 690                 data->auxiliary.last_bytes_used = 0x1;
 691                 data->length = reclen;
 692                 data->operation.operation = 0x06;
 693                 break;
 694         case DASD_ECKD_CCW_READ_CKD:
 695         case DASD_ECKD_CCW_READ_CKD_MT:
 696                 data->auxiliary.last_bytes_used = 0x1;
 697                 data->length = reclen;
 698                 data->operation.operation = 0x16;
 699                 break;
 700         case DASD_ECKD_CCW_READ_COUNT:
 701                 data->operation.operation = 0x06;
 702                 break;
 703         case DASD_ECKD_CCW_ERASE:
 704                 data->length = reclen;
 705                 data->auxiliary.last_bytes_used = 0x1;
 706                 data->operation.operation = 0x0b;
 707                 break;
 708         default:
 709                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
 710                               "opcode 0x%x", cmd);
 711         }
 712         set_ch_t(&data->seek_addr,
 713                  trk / private->rdc_data.trk_per_cyl,
 714                  trk % private->rdc_data.trk_per_cyl);
 715         data->search_arg.cyl = data->seek_addr.cyl;
 716         data->search_arg.head = data->seek_addr.head;
 717         data->search_arg.record = rec_on_trk;
 718 }
 719
 720 /*
 721  * Returns 1 if the block is one of the special blocks that needs
 722  * to get read/written with the KD variant of the command.
 723  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 724  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 725  * Luckily the KD variants differ only by one bit (0x08) from the
 726  * normal variant. So don't wonder about code like:
 727  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 728  *         ccw->cmd_code |= 0x8;
 729  */
 730 static inline int
 731 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 732 {
 733         if (recid < 3)
 734                 return 1;
 735         if (recid < blk_per_trk)
 736                 return 0;
 737         if (recid < 2 * blk_per_trk)
 738                 return 1;
 739         return 0;
 740 }
 741
 742 /*
 743  * Returns the record size for the special blocks of the cdl format.
 744  * Only returns something useful if dasd_eckd_cdl_special is true
 745  * for the recid.
 746  */
 747 static inline int
 748 dasd_eckd_cdl_reclen(int recid)
 749 {
 750         if (recid < 3)
 751                 return sizes_trk0[recid];
 752         return LABEL_SIZE;
 753 }
 754 /* create unique id from private structure. */
 755 static void create_uid(struct dasd_eckd_private *private)
 756 {
 757         int count;
 758         struct dasd_uid *uid;
 759
 760         uid = &private->uid;
 761         memset(uid, 0, sizeof(struct dasd_uid));
 762         memcpy(uid->vendor, private->ned->HDA_manufacturer,
 763                sizeof(uid->vendor) - 1);
 764         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 765         memcpy(uid->serial, private->ned->HDA_location,
 766                sizeof(uid->serial) - 1);
 767         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 768         uid->ssid = private->gneq->subsystemID;
 769         uid->real_unit_addr = private->ned->unit_addr;
 770         if (private->sneq) {
 771                 uid->type = private->sneq->sua_flags;
 772                 if (uid->type == UA_BASE_PAV_ALIAS)
 773                         uid->base_unit_addr = private->sneq->base_unit_addr;
 774         } else {
 775                 uid->type = UA_BASE_DEVICE;
 776         }
 777         if (private->vdsneq) {
 778                 for (count = 0; count < 16; count++) {
 779                         sprintf(uid->vduit+2*count, "%02x",
 780                                 private->vdsneq->uit[count]);
 781                 }
 782         }
 783 }
 784
 785 /*
 786  * Generate device unique id that specifies the physical device.
 787  */
 788 static int dasd_eckd_generate_uid(struct dasd_device *device)
 789 {
 790         struct dasd_eckd_private *private;
 791         unsigned long flags;
 792
 793         private = (struct dasd_eckd_private *) device->private;
 794         if (!private)
 795                 return -ENODEV;
 796         if (!private->ned || !private->gneq)
 797                 return -ENODEV;
 798         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 799         create_uid(private);
 800         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 801         return 0;
 802 }
 803
 804 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
 805 {
 806         struct dasd_eckd_private *private;
 807         unsigned long flags;
 808
 809         if (device->private) {
 810                 private = (struct dasd_eckd_private *)device->private;
 811                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 812                 *uid = private->uid;
 813                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 814                 return 0;
 815         }
 816         return -EINVAL;
 817 }
 818
 819 /*
 820  * compare device UID with data of a given dasd_eckd_private structure
 821  * return 0 for match
 822  */
 823 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
 824                                       struct dasd_eckd_private *private)
 825 {
 826         struct dasd_uid device_uid;
 827
 828         create_uid(private);
 829         dasd_eckd_get_uid(device, &device_uid);
 830
 831         return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
 832 }
 833
 834 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
 835                                    struct dasd_ccw_req *cqr,
 836                                    __u8 *rcd_buffer,
 837                                    __u8 lpm)
 838 {
 839         struct ccw1 *ccw;
 840         /*
 841          * buffer has to start with EBCDIC "V1.0" to show
 842          * support for virtual device SNEQ
 843          */
 844         rcd_buffer[0] = 0xE5;
 845         rcd_buffer[1] = 0xF1;
 846         rcd_buffer[2] = 0x4B;
 847         rcd_buffer[3] = 0xF0;
 848
 849         ccw = cqr->cpaddr;
 850         ccw->cmd_code = DASD_ECKD_CCW_RCD;
 851         ccw->flags = 0;
 852         ccw->cda = (__u32)(addr_t)rcd_buffer;
 853         ccw->count = DASD_ECKD_RCD_DATA_SIZE;
 854         cqr->magic = DASD_ECKD_MAGIC;
 855
 856         cqr->startdev = device;
 857         cqr->memdev = device;
 858         cqr->block = NULL;
 859         cqr->expires = 10*HZ;
 860         cqr->lpm = lpm;
 861         cqr->retries = 256;
 862         cqr->buildclk = get_clock();
 863         cqr->status = DASD_CQR_FILLED;
 864         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
 865 }
 866
 867 /*
 868  * Wakeup helper for read_conf
 869  * if the cqr is not done and needs some error recovery
 870  * the buffer has to be re-initialized with the EBCDIC "V1.0"
 871  * to show support for virtual device SNEQ
 872  */
 873 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
 874 {
 875         struct ccw1 *ccw;
 876         __u8 *rcd_buffer;
 877
 878         if (cqr->status !=  DASD_CQR_DONE) {
 879                 ccw = cqr->cpaddr;
 880                 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
 881                 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
 882
 883                 rcd_buffer[0] = 0xE5;
 884                 rcd_buffer[1] = 0xF1;
 885                 rcd_buffer[2] = 0x4B;
 886                 rcd_buffer[3] = 0xF0;
 887         }
 888         dasd_wakeup_cb(cqr, data);
 889 }
 890
 891 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
 892                                            struct dasd_ccw_req *cqr,
 893                                            __u8 *rcd_buffer,
 894                                            __u8 lpm)
 895 {
 896         struct ciw *ciw;
 897         int rc;
 898         /*
 899          * sanity check: scan for RCD command in extended SenseID data
 900          * some devices do not support RCD
 901          */
 902         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 903         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
 904                 return -EOPNOTSUPP;
 905
 906         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
 907         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 908         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
 909         cqr->retries = 5;
 910         cqr->callback = read_conf_cb;
 911         rc = dasd_sleep_on_immediatly(cqr);
 912         return rc;
 913 }
 914
 915 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 916                                    void **rcd_buffer,
 917                                    int *rcd_buffer_size, __u8 lpm)
 918 {
 919         struct ciw *ciw;
 920         char *rcd_buf = NULL;
 921         int ret;
 922         struct dasd_ccw_req *cqr;
 923
 924         /*
 925          * sanity check: scan for RCD command in extended SenseID data
 926          * some devices do not support RCD
 927          */
 928         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 929         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
 930                 ret = -EOPNOTSUPP;
 931                 goto out_error;
 932         }
 933         rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
 934         if (!rcd_buf) {
 935                 ret = -ENOMEM;
 936                 goto out_error;
 937         }
 938         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
 939                                    0, /* use rcd_buf as data ara */
 940                                    device);
 941         if (IS_ERR(cqr)) {
 942                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 943                               "Could not allocate RCD request");
 944                 ret = -ENOMEM;
 945                 goto out_error;
 946         }
 947         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
 948         cqr->callback = read_conf_cb;
 949         ret = dasd_sleep_on(cqr);
 950         /*
 951          * on success we update the user input parms
 952          */
 953         dasd_sfree_request(cqr, cqr->memdev);
 954         if (ret)
 955                 goto out_error;
 956
 957         *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
 958         *rcd_buffer = rcd_buf;
 959         return 0;
 960 out_error:
 961         kfree(rcd_buf);
 962         *rcd_buffer = NULL;
 963         *rcd_buffer_size = 0;
 964         return ret;
 965 }
 966
 967 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
 968 {
 969
 970         struct dasd_sneq *sneq;
 971         int i, count;
 972
 973         private->ned = NULL;
 974         private->sneq = NULL;
 975         private->vdsneq = NULL;
 976         private->gneq = NULL;
 977         count = private->conf_len / sizeof(struct dasd_sneq);
 978         sneq = (struct dasd_sneq *)private->conf_data;
 979         for (i = 0; i < count; ++i) {
 980                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 981                         private->sneq = sneq;
 982                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 983                         private->vdsneq = (struct vd_sneq *)sneq;
 984                 else if (sneq->flags.identifier == 2)
 985                         private->gneq = (struct dasd_gneq *)sneq;
 986                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 987                         private->ned = (struct dasd_ned *)sneq;
 988                 sneq++;
 989         }
 990         if (!private->ned || !private->gneq) {
 991                 private->ned = NULL;
 992                 private->sneq = NULL;
 993                 private->vdsneq = NULL;
 994                 private->gneq = NULL;
 995                 return -EINVAL;
 996         }
 997         return 0;
 998
 999 };
1000
1001 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
1002 {
1003         struct dasd_gneq *gneq;
1004         int i, count, found;
1005
1006         count = conf_len / sizeof(*gneq);
1007         gneq = (struct dasd_gneq *)conf_data;
1008         found = 0;
1009         for (i = 0; i < count; ++i) {
1010                 if (gneq->flags.identifier == 2) {
1011                         found = 1;
1012                         break;
1013                 }
1014                 gneq++;
1015         }
1016         if (found)
1017                 return ((char *)gneq)[18] & 0x07;
1018         else
1019                 return 0;
1020 }
1021
1022 static int dasd_eckd_read_conf(struct dasd_device *device)
1023 {
1024         void *conf_data;
1025         int conf_len, conf_data_saved;
1026         int rc;
1027         __u8 lpm, opm;
1028         struct dasd_eckd_private *private, path_private;
1029         struct dasd_path *path_data;
1030         struct dasd_uid *uid;
1031         char print_path_uid[60], print_device_uid[60];
1032
1033         private = (struct dasd_eckd_private *) device->private;
1034         path_data = &device->path_data;
1035         opm = ccw_device_get_path_mask(device->cdev);
1036         conf_data_saved = 0;
1037         /* get configuration data per operational path */
1038         for (lpm = 0x80; lpm; lpm>>= 1) {
1039                 if (!(lpm & opm))
1040                         continue;
1041                 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1042                                              &conf_len, lpm);
1043                 if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
1044                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1045                                         "Read configuration data returned "
1046                                         "error %d", rc);
1047                         return rc;
1048                 }
1049                 if (conf_data == NULL) {
1050                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1051                                         "No configuration data "
1052                                         "retrieved");
1053                         /* no further analysis possible */
1054                         path_data->opm |= lpm;
1055                         continue;       /* no error */
1056                 }
1057                 /* save first valid configuration data */
1058                 if (!conf_data_saved) {
1059                         kfree(private->conf_data);
1060                         private->conf_data = conf_data;
1061                         private->conf_len = conf_len;
1062                         if (dasd_eckd_identify_conf_parts(private)) {
1063                                 private->conf_data = NULL;
1064                                 private->conf_len = 0;
1065                                 kfree(conf_data);
1066                                 continue;
1067                         }
1068                         /*
1069                          * build device UID that other path data
1070                          * can be compared to it
1071                          */
1072                         dasd_eckd_generate_uid(device);
1073                         conf_data_saved++;
1074                 } else {
1075                         path_private.conf_data = conf_data;
1076                         path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1077                         if (dasd_eckd_identify_conf_parts(
1078                                     &path_private)) {
1079                                 path_private.conf_data = NULL;
1080                                 path_private.conf_len = 0;
1081                                 kfree(conf_data);
1082                                 continue;
1083                         }
1084
1085                         if (dasd_eckd_compare_path_uid(
1086                                     device, &path_private)) {
1087                                 uid = &path_private.uid;
1088                                 if (strlen(uid->vduit) > 0)
1089                                         snprintf(print_path_uid,
1090                                                  sizeof(print_path_uid),
1091                                                  "%s.%s.%04x.%02x.%s",
1092                                                  uid->vendor, uid->serial,
1093                                                  uid->ssid, uid->real_unit_addr,
1094                                                  uid->vduit);
1095                                 else
1096                                         snprintf(print_path_uid,
1097                                                  sizeof(print_path_uid),
1098                                                  "%s.%s.%04x.%02x",
1099                                                  uid->vendor, uid->serial,
1100                                                  uid->ssid,
1101                                                  uid->real_unit_addr);
1102                                 uid = &private->uid;
1103                                 if (strlen(uid->vduit) > 0)
1104                                         snprintf(print_device_uid,
1105                                                  sizeof(print_device_uid),
1106                                                  "%s.%s.%04x.%02x.%s",
1107                                                  uid->vendor, uid->serial,
1108                                                  uid->ssid, uid->real_unit_addr,
1109                                                  uid->vduit);
1110                                 else
1111                                         snprintf(print_device_uid,
1112                                                  sizeof(print_device_uid),
1113                                                  "%s.%s.%04x.%02x",
1114                                                  uid->vendor, uid->serial,
1115                                                  uid->ssid,
1116                                                  uid->real_unit_addr);
1117                                 dev_err(&device->cdev->dev,
1118                                         "Not all channel paths lead to "
1119                                         "the same device, path %02X leads to "
1120                                         "device %s instead of %s\n", lpm,
1121                                         print_path_uid, print_device_uid);
1122                                 return -EINVAL;
1123                         }
1124
1125                         path_private.conf_data = NULL;
1126                         path_private.conf_len = 0;
1127                 }
1128                 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1129                 case 0x02:
1130                         path_data->npm |= lpm;
1131                         break;
1132                 case 0x03:
1133                         path_data->ppm |= lpm;
1134                         break;
1135                 }
1136                 path_data->opm |= lpm;
1137
1138                 if (conf_data != private->conf_data)
1139                         kfree(conf_data);
1140         }
1141
1142         return 0;
1143 }
1144
1145 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1146 {
1147         struct dasd_eckd_private *private;
1148         int mdc;
1149         u32 fcx_max_data;
1150
1151         private = (struct dasd_eckd_private *) device->private;
1152         if (private->fcx_max_data) {
1153                 mdc = ccw_device_get_mdc(device->cdev, lpm);
1154                 if ((mdc < 0)) {
1155                         dev_warn(&device->cdev->dev,
1156                                  "Detecting the maximum data size for zHPF "
1157                                  "requests failed (rc=%d) for a new path %x\n",
1158                                  mdc, lpm);
1159                         return mdc;
1160                 }
1161                 fcx_max_data = mdc * FCX_MAX_DATA_FACTOR;
1162                 if (fcx_max_data < private->fcx_max_data) {
1163                         dev_warn(&device->cdev->dev,
1164                                  "The maximum data size for zHPF requests %u "
1165                                  "on a new path %x is below the active maximum "
1166                                  "%u\n", fcx_max_data, lpm,
1167                                  private->fcx_max_data);
1168                         return -EACCES;
1169                 }
1170         }
1171         return 0;
1172 }
1173
1174 static int rebuild_device_uid(struct dasd_device *device,
1175                               struct path_verification_work_data *data)
1176 {
1177         struct dasd_eckd_private *private;
1178         struct dasd_path *path_data;
1179         __u8 lpm, opm;
1180         int rc;
1181
1182         rc = -ENODEV;
1183         private = (struct dasd_eckd_private *) device->private;
1184         path_data = &device->path_data;
1185         opm = device->path_data.opm;
1186
1187         for (lpm = 0x80; lpm; lpm >>= 1) {
1188                 if (!(lpm & opm))
1189                         continue;
1190                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1191                 memset(&data->cqr, 0, sizeof(data->cqr));
1192                 data->cqr.cpaddr = &data->ccw;
1193                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1194                                                      data->rcd_buffer,
1195                                                      lpm);
1196
1197                 if (rc) {
1198                         if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1199                                 continue;
1200                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1201                                         "Read configuration data "
1202                                         "returned error %d", rc);
1203                         break;
1204                 }
1205                 memcpy(private->conf_data, data->rcd_buffer,
1206                        DASD_ECKD_RCD_DATA_SIZE);
1207                 if (dasd_eckd_identify_conf_parts(private)) {
1208                         rc = -ENODEV;
1209                 } else /* first valid path is enough */
1210                         break;
1211         }
1212
1213         if (!rc)
1214                 rc = dasd_eckd_generate_uid(device);
1215
1216         return rc;
1217 }
1218
1219 static void do_path_verification_work(struct work_struct *work)
1220 {
1221         struct path_verification_work_data *data;
1222         struct dasd_device *device;
1223         struct dasd_eckd_private path_private;
1224         struct dasd_uid *uid;
1225         __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1226         __u8 lpm, opm, npm, ppm, epm;
1227         unsigned long flags;
1228         char print_uid[60];
1229         int rc;
1230
1231         data = container_of(work, struct path_verification_work_data, worker);
1232         device = data->device;
1233
1234         /* delay path verification until device was resumed */
1235         if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1236                 schedule_work(work);
1237                 return;
1238         }
1239
1240         opm = 0;
1241         npm = 0;
1242         ppm = 0;
1243         epm = 0;
1244         for (lpm = 0x80; lpm; lpm >>= 1) {
1245                 if (!(lpm & data->tbvpm))
1246                         continue;
1247                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1248                 memset(&data->cqr, 0, sizeof(data->cqr));
1249                 data->cqr.cpaddr = &data->ccw;
1250                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1251                                                      data->rcd_buffer,
1252                                                      lpm);
1253                 if (!rc) {
1254                         switch (dasd_eckd_path_access(data->rcd_buffer,
1255                                                       DASD_ECKD_RCD_DATA_SIZE)
1256                                 ) {
1257                         case 0x02:
1258                                 npm |= lpm;
1259                                 break;
1260                         case 0x03:
1261                                 ppm |= lpm;
1262                                 break;
1263                         }
1264                         opm |= lpm;
1265                 } else if (rc == -EOPNOTSUPP) {
1266                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1267                                         "path verification: No configuration "
1268                                         "data retrieved");
1269                         opm |= lpm;
1270                 } else if (rc == -EAGAIN) {
1271                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1272                                         "path verification: device is stopped,"
1273                                         " try again later");
1274                         epm |= lpm;
1275                 } else {
1276                         dev_warn(&device->cdev->dev,
1277                                  "Reading device feature codes failed "
1278                                  "(rc=%d) for new path %x\n", rc, lpm);
1279                         continue;
1280                 }
1281                 if (verify_fcx_max_data(device, lpm)) {
1282                         opm &= ~lpm;
1283                         npm &= ~lpm;
1284                         ppm &= ~lpm;
1285                         continue;
1286                 }
1287
1288                 /*
1289                  * save conf_data for comparison after
1290                  * rebuild_device_uid may have changed
1291                  * the original data
1292                  */
1293                 memcpy(&path_rcd_buf, data->rcd_buffer,
1294                        DASD_ECKD_RCD_DATA_SIZE);
1295                 path_private.conf_data = (void *) &path_rcd_buf;
1296                 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1297                 if (dasd_eckd_identify_conf_parts(&path_private)) {
1298                         path_private.conf_data = NULL;
1299                         path_private.conf_len = 0;
1300                         continue;
1301                 }
1302
1303                 /*
1304                  * compare path UID with device UID only if at least
1305                  * one valid path is left
1306                  * in other case the device UID may have changed and
1307                  * the first working path UID will be used as device UID
1308                  */
1309                 if (device->path_data.opm &&
1310                     dasd_eckd_compare_path_uid(device, &path_private)) {
1311                         /*
1312                          * the comparison was not successful
1313                          * rebuild the device UID with at least one
1314                          * known path in case a z/VM hyperswap command
1315                          * has changed the device
1316                          *
1317                          * after this compare again
1318                          *
1319                          * if either the rebuild or the recompare fails
1320                          * the path can not be used
1321                          */
1322                         if (rebuild_device_uid(device, data) ||
1323                             dasd_eckd_compare_path_uid(
1324                                     device, &path_private)) {
1325                                 uid = &path_private.uid;
1326                                 if (strlen(uid->vduit) > 0)
1327                                         snprintf(print_uid, sizeof(print_uid),
1328                                                  "%s.%s.%04x.%02x.%s",
1329                                                  uid->vendor, uid->serial,
1330                                                  uid->ssid, uid->real_unit_addr,
1331                                                  uid->vduit);
1332                                 else
1333                                         snprintf(print_uid, sizeof(print_uid),
1334                                                  "%s.%s.%04x.%02x",
1335                                                  uid->vendor, uid->serial,
1336                                                  uid->ssid,
1337                                                  uid->real_unit_addr);
1338                                 dev_err(&device->cdev->dev,
1339                                         "The newly added channel path %02X "
1340                                         "will not be used because it leads "
1341                                         "to a different device %s\n",
1342                                         lpm, print_uid);
1343                                 opm &= ~lpm;
1344                                 npm &= ~lpm;
1345                                 ppm &= ~lpm;
1346                                 continue;
1347                         }
1348                 }
1349
1350                 /*
1351                  * There is a small chance that a path is lost again between
1352                  * above path verification and the following modification of
1353                  * the device opm mask. We could avoid that race here by using
1354                  * yet another path mask, but we rather deal with this unlikely
1355                  * situation in dasd_start_IO.
1356                  */
1357                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1358                 if (!device->path_data.opm && opm) {
1359                         device->path_data.opm = opm;
1360                         dasd_generic_path_operational(device);
1361                 } else
1362                         device->path_data.opm |= opm;
1363                 device->path_data.npm |= npm;
1364                 device->path_data.ppm |= ppm;
1365                 device->path_data.tbvpm |= epm;
1366                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1367         }
1368
1369         dasd_put_device(device);
1370         if (data->isglobal)
1371                 mutex_unlock(&dasd_path_verification_mutex);
1372         else
1373                 kfree(data);
1374 }
1375
1376 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1377 {
1378         struct path_verification_work_data *data;
1379
1380         data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1381         if (!data) {
1382                 if (mutex_trylock(&dasd_path_verification_mutex)) {
1383                         data = path_verification_worker;
1384                         data->isglobal = 1;
1385                 } else
1386                         return -ENOMEM;
1387         } else {
1388                 memset(data, 0, sizeof(*data));
1389                 data->isglobal = 0;
1390         }
1391         INIT_WORK(&data->worker, do_path_verification_work);
1392         dasd_get_device(device);
1393         data->device = device;
1394         data->tbvpm = lpm;
1395         schedule_work(&data->worker);
1396         return 0;
1397 }
1398
1399 static int dasd_eckd_read_features(struct dasd_device *device)
1400 {
1401         struct dasd_psf_prssd_data *prssdp;
1402         struct dasd_rssd_features *features;
1403         struct dasd_ccw_req *cqr;
1404         struct ccw1 *ccw;
1405         int rc;
1406         struct dasd_eckd_private *private;
1407
1408         private = (struct dasd_eckd_private *) device->private;
1409         memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1410         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1411                                    (sizeof(struct dasd_psf_prssd_data) +
1412                                     sizeof(struct dasd_rssd_features)),
1413                                    device);
1414         if (IS_ERR(cqr)) {
1415                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1416                                 "allocate initialization request");
1417                 return PTR_ERR(cqr);
1418         }
1419         cqr->startdev = device;
1420         cqr->memdev = device;
1421         cqr->block = NULL;
1422         cqr->retries = 256;
1423         cqr->expires = 10 * HZ;
1424
1425         /* Prepare for Read Subsystem Data */
1426         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1427         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1428         prssdp->order = PSF_ORDER_PRSSD;
1429         prssdp->suborder = 0x41;        /* Read Feature Codes */
1430         /* all other bytes of prssdp must be zero */
1431
1432         ccw = cqr->cpaddr;
1433         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1434         ccw->count = sizeof(struct dasd_psf_prssd_data);
1435         ccw->flags |= CCW_FLAG_CC;
1436         ccw->cda = (__u32)(addr_t) prssdp;
1437
1438         /* Read Subsystem Data - feature codes */
1439         features = (struct dasd_rssd_features *) (prssdp + 1);
1440         memset(features, 0, sizeof(struct dasd_rssd_features));
1441
1442         ccw++;
1443         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1444         ccw->count = sizeof(struct dasd_rssd_features);
1445         ccw->cda = (__u32)(addr_t) features;
1446
1447         cqr->buildclk = get_clock();
1448         cqr->status = DASD_CQR_FILLED;
1449         rc = dasd_sleep_on(cqr);
1450         if (rc == 0) {
1451                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1452                 features = (struct dasd_rssd_features *) (prssdp + 1);
1453                 memcpy(&private->features, features,
1454                        sizeof(struct dasd_rssd_features));
1455         } else
1456                 dev_warn(&device->cdev->dev, "Reading device feature codes"
1457                          " failed with rc=%d\n", rc);
1458         dasd_sfree_request(cqr, cqr->memdev);
1459         return rc;
1460 }
1461
1462
1463 /*
1464  * Build CP for Perform Subsystem Function - SSC.
1465  */
1466 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1467                                                     int enable_pav)
1468 {
1469         struct dasd_ccw_req *cqr;
1470         struct dasd_psf_ssc_data *psf_ssc_data;
1471         struct ccw1 *ccw;
1472
1473         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1474                                   sizeof(struct dasd_psf_ssc_data),
1475                                   device);
1476
1477         if (IS_ERR(cqr)) {
1478                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1479                            "Could not allocate PSF-SSC request");
1480                 return cqr;
1481         }
1482         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1483         psf_ssc_data->order = PSF_ORDER_SSC;
1484         psf_ssc_data->suborder = 0xc0;
1485         if (enable_pav) {
1486                 psf_ssc_data->suborder |= 0x08;
1487                 psf_ssc_data->reserved[0] = 0x88;
1488         }
1489         ccw = cqr->cpaddr;
1490         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1491         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1492         ccw->count = 66;
1493
1494         cqr->startdev = device;
1495         cqr->memdev = device;
1496         cqr->block = NULL;
1497         cqr->retries = 256;
1498         cqr->expires = 10*HZ;
1499         cqr->buildclk = get_clock();
1500         cqr->status = DASD_CQR_FILLED;
1501         return cqr;
1502 }
1503
1504 /*
1505  * Perform Subsystem Function.
1506  * It is necessary to trigger CIO for channel revalidation since this
1507  * call might change behaviour of DASD devices.
1508  */
1509 static int
1510 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1511                   unsigned long flags)
1512 {
1513         struct dasd_ccw_req *cqr;
1514         int rc;
1515
1516         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1517         if (IS_ERR(cqr))
1518                 return PTR_ERR(cqr);
1519
1520         /*
1521          * set flags e.g. turn on failfast, to prevent blocking
1522          * the calling function should handle failed requests
1523          */
1524         cqr->flags |= flags;
1525
1526         rc = dasd_sleep_on(cqr);
1527         if (!rc)
1528                 /* trigger CIO to reprobe devices */
1529                 css_schedule_reprobe();
1530         else if (cqr->intrc == -EAGAIN)
1531                 rc = -EAGAIN;
1532
1533         dasd_sfree_request(cqr, cqr->memdev);
1534         return rc;
1535 }
1536
1537 /*
1538  * Valide storage server of current device.
1539  */
1540 static int dasd_eckd_validate_server(struct dasd_device *device,
1541                                      unsigned long flags)
1542 {
1543         int rc;
1544         struct dasd_eckd_private *private;
1545         int enable_pav;
1546
1547         private = (struct dasd_eckd_private *) device->private;
1548         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1549             private->uid.type == UA_HYPER_PAV_ALIAS)
1550                 return 0;
1551         if (dasd_nopav || MACHINE_IS_VM)
1552                 enable_pav = 0;
1553         else
1554                 enable_pav = 1;
1555         rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1556
1557         /* may be requested feature is not available on server,
1558          * therefore just report error and go ahead */
1559         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1560                         "returned rc=%d", private->uid.ssid, rc);
1561         return rc;
1562 }
1563
1564 /*
1565  * worker to do a validate server in case of a lost pathgroup
1566  */
1567 static void dasd_eckd_do_validate_server(struct work_struct *work)
1568 {
1569         struct dasd_device *device = container_of(work, struct dasd_device,
1570                                                   kick_validate);
1571         if (dasd_eckd_validate_server(device, DASD_CQR_FLAGS_FAILFAST)
1572             == -EAGAIN) {
1573                 /* schedule worker again if failed */
1574                 schedule_work(&device->kick_validate);
1575                 return;
1576         }
1577
1578         dasd_put_device(device);
1579 }
1580
1581 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1582 {
1583         dasd_get_device(device);
1584         /* exit if device not online or in offline processing */
1585         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1586            device->state < DASD_STATE_ONLINE) {
1587                 dasd_put_device(device);
1588                 return;
1589         }
1590         /* queue call to do_validate_server to the kernel event daemon. */
1591         schedule_work(&device->kick_validate);
1592 }
1593
1594 static u32 get_fcx_max_data(struct dasd_device *device)
1595 {
1596 #if defined(CONFIG_64BIT)
1597         int tpm, mdc;
1598         int fcx_in_css, fcx_in_gneq, fcx_in_features;
1599         struct dasd_eckd_private *private;
1600
1601         if (dasd_nofcx)
1602                 return 0;
1603         /* is transport mode supported? */
1604         private = (struct dasd_eckd_private *) device->private;
1605         fcx_in_css = css_general_characteristics.fcx;
1606         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1607         fcx_in_features = private->features.feature[40] & 0x80;
1608         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1609
1610         if (!tpm)
1611                 return 0;
1612
1613         mdc = ccw_device_get_mdc(device->cdev, 0);
1614         if (mdc < 0) {
1615                 dev_warn(&device->cdev->dev, "Detecting the maximum supported"
1616                          " data size for zHPF requests failed\n");
1617                 return 0;
1618         } else
1619                 return mdc * FCX_MAX_DATA_FACTOR;
1620 #else
1621         return 0;
1622 #endif
1623 }
1624
1625 /*
1626  * Check device characteristics.
1627  * If the device is accessible using ECKD discipline, the device is enabled.
1628  */
1629 static int
1630 dasd_eckd_check_characteristics(struct dasd_device *device)
1631 {
1632         struct dasd_eckd_private *private;
1633         struct dasd_block *block;
1634         struct dasd_uid temp_uid;
1635         int rc, i;
1636         int readonly;
1637         unsigned long value;
1638
1639         /* setup work queue for validate server*/
1640         INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1641
1642         if (!ccw_device_is_pathgroup(device->cdev)) {
1643                 dev_warn(&device->cdev->dev,
1644                          "A channel path group could not be established\n");
1645                 return -EIO;
1646         }
1647         if (!ccw_device_is_multipath(device->cdev)) {
1648                 dev_info(&device->cdev->dev,
1649                          "The DASD is not operating in multipath mode\n");
1650         }
1651         private = (struct dasd_eckd_private *) device->private;
1652         if (!private) {
1653                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1654                 if (!private) {
1655                         dev_warn(&device->cdev->dev,
1656                                  "Allocating memory for private DASD data "
1657                                  "failed\n");
1658                         return -ENOMEM;
1659                 }
1660                 device->private = (void *) private;
1661         } else {
1662                 memset(private, 0, sizeof(*private));
1663         }
1664         /* Invalidate status of initial analysis. */
1665         private->init_cqr_status = -1;
1666         /* Set default cache operations. */
1667         private->attrib.operation = DASD_NORMAL_CACHE;
1668         private->attrib.nr_cyl = 0;
1669
1670         /* Read Configuration Data */
1671         rc = dasd_eckd_read_conf(device);
1672         if (rc)
1673                 goto out_err1;
1674
1675         /* set default timeout */
1676         device->default_expires = DASD_EXPIRES;
1677         if (private->gneq) {
1678                 value = 1;
1679                 for (i = 0; i < private->gneq->timeout.value; i++)
1680                         value = 10 * value;
1681                 value = value * private->gneq->timeout.number;
1682                 /* do not accept useless values */
1683                 if (value != 0 && value <= DASD_EXPIRES_MAX)
1684                         device->default_expires = value;
1685         }
1686
1687         dasd_eckd_get_uid(device, &temp_uid);
1688         if (temp_uid.type == UA_BASE_DEVICE) {
1689                 block = dasd_alloc_block();
1690                 if (IS_ERR(block)) {
1691                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1692                                         "could not allocate dasd "
1693                                         "block structure");
1694                         rc = PTR_ERR(block);
1695                         goto out_err1;
1696                 }
1697                 device->block = block;
1698                 block->base = device;
1699         }
1700
1701         /* register lcu with alias handling, enable PAV */
1702         rc = dasd_alias_make_device_known_to_lcu(device);
1703         if (rc)
1704                 goto out_err2;
1705
1706         dasd_eckd_validate_server(device, 0);
1707
1708         /* device may report different configuration data after LCU setup */
1709         rc = dasd_eckd_read_conf(device);
1710         if (rc)
1711                 goto out_err3;
1712
1713         /* Read Feature Codes */
1714         dasd_eckd_read_features(device);
1715
1716         /* Read Device Characteristics */
1717         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1718                                          &private->rdc_data, 64);
1719         if (rc) {
1720                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1721                                 "Read device characteristic failed, rc=%d", rc);
1722                 goto out_err3;
1723         }
1724
1725         if ((device->features & DASD_FEATURE_USERAW) &&
1726             !(private->rdc_data.facilities.RT_in_LR)) {
1727                 dev_err(&device->cdev->dev, "The storage server does not "
1728                         "support raw-track access\n");
1729                 rc = -EINVAL;
1730                 goto out_err3;
1731         }
1732
1733         /* find the valid cylinder size */
1734         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1735             private->rdc_data.long_no_cyl)
1736                 private->real_cyl = private->rdc_data.long_no_cyl;
1737         else
1738                 private->real_cyl = private->rdc_data.no_cyl;
1739
1740         private->fcx_max_data = get_fcx_max_data(device);
1741
1742         readonly = dasd_device_is_ro(device);
1743         if (readonly)
1744                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1745
1746         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1747                  "with %d cylinders, %d heads, %d sectors%s\n",
1748                  private->rdc_data.dev_type,
1749                  private->rdc_data.dev_model,
1750                  private->rdc_data.cu_type,
1751                  private->rdc_data.cu_model.model,
1752                  private->real_cyl,
1753                  private->rdc_data.trk_per_cyl,
1754                  private->rdc_data.sec_per_trk,
1755                  readonly ? ", read-only device" : "");
1756         return 0;
1757
1758 out_err3:
1759         dasd_alias_disconnect_device_from_lcu(device);
1760 out_err2:
1761         dasd_free_block(device->block);
1762         device->block = NULL;
1763 out_err1:
1764         kfree(private->conf_data);
1765         kfree(device->private);
1766         device->private = NULL;
1767         return rc;
1768 }
1769
1770 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1771 {
1772         struct dasd_eckd_private *private;
1773
1774         private = (struct dasd_eckd_private *) device->private;
1775         dasd_alias_disconnect_device_from_lcu(device);
1776         private->ned = NULL;
1777         private->sneq = NULL;
1778         private->vdsneq = NULL;
1779         private->gneq = NULL;
1780         private->conf_len = 0;
1781         kfree(private->conf_data);
1782         private->conf_data = NULL;
1783 }
1784
1785 static struct dasd_ccw_req *
1786 dasd_eckd_analysis_ccw(struct dasd_device *device)
1787 {
1788         struct dasd_eckd_private *private;
1789         struct eckd_count *count_data;
1790         struct LO_eckd_data *LO_data;
1791         struct dasd_ccw_req *cqr;
1792         struct ccw1 *ccw;
1793         int cplength, datasize;
1794         int i;
1795
1796         private = (struct dasd_eckd_private *) device->private;
1797
1798         cplength = 8;
1799         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1800         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1801         if (IS_ERR(cqr))
1802                 return cqr;
1803         ccw = cqr->cpaddr;
1804         /* Define extent for the first 3 tracks. */
1805         define_extent(ccw++, cqr->data, 0, 2,
1806                       DASD_ECKD_CCW_READ_COUNT, device);
1807         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1808         /* Locate record for the first 4 records on track 0. */
1809         ccw[-1].flags |= CCW_FLAG_CC;
1810         locate_record(ccw++, LO_data++, 0, 0, 4,
1811                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1812
1813         count_data = private->count_area;
1814         for (i = 0; i < 4; i++) {
1815                 ccw[-1].flags |= CCW_FLAG_CC;
1816                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1817                 ccw->flags = 0;
1818                 ccw->count = 8;
1819                 ccw->cda = (__u32)(addr_t) count_data;
1820                 ccw++;
1821                 count_data++;
1822         }
1823
1824         /* Locate record for the first record on track 2. */
1825         ccw[-1].flags |= CCW_FLAG_CC;
1826         locate_record(ccw++, LO_data++, 2, 0, 1,
1827                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1828         /* Read count ccw. */
1829         ccw[-1].flags |= CCW_FLAG_CC;
1830         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1831         ccw->flags = 0;
1832         ccw->count = 8;
1833         ccw->cda = (__u32)(addr_t) count_data;
1834
1835         cqr->block = NULL;
1836         cqr->startdev = device;
1837         cqr->memdev = device;
1838         cqr->retries = 255;
1839         cqr->buildclk = get_clock();
1840         cqr->status = DASD_CQR_FILLED;
1841         return cqr;
1842 }
1843
1844 /* differentiate between 'no record found' and any other error */
1845 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1846 {
1847         char *sense;
1848         if (init_cqr->status == DASD_CQR_DONE)
1849                 return INIT_CQR_OK;
1850         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1851                  init_cqr->status == DASD_CQR_FAILED) {
1852                 sense = dasd_get_sense(&init_cqr->irb);
1853                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1854                         return INIT_CQR_UNFORMATTED;
1855                 else
1856                         return INIT_CQR_ERROR;
1857         } else
1858                 return INIT_CQR_ERROR;
1859 }
1860
1861 /*
1862  * This is the callback function for the init_analysis cqr. It saves
1863  * the status of the initial analysis ccw before it frees it and kicks
1864  * the device to continue the startup sequence. This will call
1865  * dasd_eckd_do_analysis again (if the devices has not been marked
1866  * for deletion in the meantime).
1867  */
1868 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1869                                         void *data)
1870 {
1871         struct dasd_eckd_private *private;
1872         struct dasd_device *device;
1873
1874         device = init_cqr->startdev;
1875         private = (struct dasd_eckd_private *) device->private;
1876         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1877         dasd_sfree_request(init_cqr, device);
1878         dasd_kick_device(device);
1879 }
1880
1881 static int dasd_eckd_start_analysis(struct dasd_block *block)
1882 {
1883         struct dasd_ccw_req *init_cqr;
1884
1885         init_cqr = dasd_eckd_analysis_ccw(block->base);
1886         if (IS_ERR(init_cqr))
1887                 return PTR_ERR(init_cqr);
1888         init_cqr->callback = dasd_eckd_analysis_callback;
1889         init_cqr->callback_data = NULL;
1890         init_cqr->expires = 5*HZ;
1891         /* first try without ERP, so we can later handle unformatted
1892          * devices as special case
1893          */
1894         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1895         init_cqr->retries = 0;
1896         dasd_add_request_head(init_cqr);
1897         return -EAGAIN;
1898 }
1899
1900 static int dasd_eckd_end_analysis(struct dasd_block *block)
1901 {
1902         struct dasd_device *device;
1903         struct dasd_eckd_private *private;
1904         struct eckd_count *count_area;
1905         unsigned int sb, blk_per_trk;
1906         int status, i;
1907         struct dasd_ccw_req *init_cqr;
1908
1909         device = block->base;
1910         private = (struct dasd_eckd_private *) device->private;
1911         status = private->init_cqr_status;
1912         private->init_cqr_status = -1;
1913         if (status == INIT_CQR_ERROR) {
1914                 /* try again, this time with full ERP */
1915                 init_cqr = dasd_eckd_analysis_ccw(device);
1916                 dasd_sleep_on(init_cqr);
1917                 status = dasd_eckd_analysis_evaluation(init_cqr);
1918                 dasd_sfree_request(init_cqr, device);
1919         }
1920
1921         if (device->features & DASD_FEATURE_USERAW) {
1922                 block->bp_block = DASD_RAW_BLOCKSIZE;
1923                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1924                 block->s2b_shift = 3;
1925                 goto raw;
1926         }
1927
1928         if (status == INIT_CQR_UNFORMATTED) {
1929                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1930                 return -EMEDIUMTYPE;
1931         } else if (status == INIT_CQR_ERROR) {
1932                 dev_err(&device->cdev->dev,
1933                         "Detecting the DASD disk layout failed because "
1934                         "of an I/O error\n");
1935                 return -EIO;
1936         }
1937
1938         private->uses_cdl = 1;
1939         /* Check Track 0 for Compatible Disk Layout */
1940         count_area = NULL;
1941         for (i = 0; i < 3; i++) {
1942                 if (private->count_area[i].kl != 4 ||
1943                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
1944                         private->uses_cdl = 0;
1945                         break;
1946                 }
1947         }
1948         if (i == 3)
1949                 count_area = &private->count_area[4];
1950
1951         if (private->uses_cdl == 0) {
1952                 for (i = 0; i < 5; i++) {
1953                         if ((private->count_area[i].kl != 0) ||
1954                             (private->count_area[i].dl !=
1955                              private->count_area[0].dl))
1956                                 break;
1957                 }
1958                 if (i == 5)
1959                         count_area = &private->count_area[0];
1960         } else {
1961                 if (private->count_area[3].record == 1)
1962                         dev_warn(&device->cdev->dev,
1963                                  "Track 0 has no records following the VTOC\n");
1964         }
1965
1966         if (count_area != NULL && count_area->kl == 0) {
1967                 /* we found notthing violating our disk layout */
1968                 if (dasd_check_blocksize(count_area->dl) == 0)
1969                         block->bp_block = count_area->dl;
1970         }
1971         if (block->bp_block == 0) {
1972                 dev_warn(&device->cdev->dev,
1973                          "The disk layout of the DASD is not supported\n");
1974                 return -EMEDIUMTYPE;
1975         }
1976         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1977         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1978                 block->s2b_shift++;
1979
1980         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1981
1982 raw:
1983         block->blocks = (private->real_cyl *
1984                           private->rdc_data.trk_per_cyl *
1985                           blk_per_trk);
1986
1987         dev_info(&device->cdev->dev,
1988                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
1989                  "%s\n", (block->bp_block >> 10),
1990                  ((private->real_cyl *
1991                    private->rdc_data.trk_per_cyl *
1992                    blk_per_trk * (block->bp_block >> 9)) >> 1),
1993                  ((blk_per_trk * block->bp_block) >> 10),
1994                  private->uses_cdl ?
1995                  "compatible disk layout" : "linux disk layout");
1996
1997         return 0;
1998 }
1999
2000 static int dasd_eckd_do_analysis(struct dasd_block *block)
2001 {
2002         struct dasd_eckd_private *private;
2003
2004         private = (struct dasd_eckd_private *) block->base->private;
2005         if (private->init_cqr_status < 0)
2006                 return dasd_eckd_start_analysis(block);
2007         else
2008                 return dasd_eckd_end_analysis(block);
2009 }
2010
2011 static int dasd_eckd_ready_to_online(struct dasd_device *device)
2012 {
2013         return dasd_alias_add_device(device);
2014 };
2015
2016 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2017 {
2018         cancel_work_sync(&device->reload_device);
2019         cancel_work_sync(&device->kick_validate);
2020         return dasd_alias_remove_device(device);
2021 };
2022
2023 static int
2024 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2025 {
2026         struct dasd_eckd_private *private;
2027
2028         private = (struct dasd_eckd_private *) block->base->private;
2029         if (dasd_check_blocksize(block->bp_block) == 0) {
2030                 geo->sectors = recs_per_track(&private->rdc_data,
2031                                               0, block->bp_block);
2032         }
2033         geo->cylinders = private->rdc_data.no_cyl;
2034         geo->heads = private->rdc_data.trk_per_cyl;
2035         return 0;
2036 }
2037
2038 static struct dasd_ccw_req *
2039 dasd_eckd_format_device(struct dasd_device * device,
2040                         struct format_data_t * fdata)
2041 {
2042         struct dasd_eckd_private *private;
2043         struct dasd_ccw_req *fcp;
2044         struct eckd_count *ect;
2045         struct ccw1 *ccw;
2046         void *data;
2047         int rpt;
2048         struct ch_t address;
2049         int cplength, datasize;
2050         int i;
2051         int intensity = 0;
2052         int r0_perm;
2053
2054         private = (struct dasd_eckd_private *) device->private;
2055         rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
2056         set_ch_t(&address,
2057                  fdata->start_unit / private->rdc_data.trk_per_cyl,
2058                  fdata->start_unit % private->rdc_data.trk_per_cyl);
2059
2060         /* Sanity checks. */
2061         if (fdata->start_unit >=
2062             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2063                 dev_warn(&device->cdev->dev, "Start track number %d used in "
2064                          "formatting is too big\n", fdata->start_unit);
2065                 return ERR_PTR(-EINVAL);
2066         }
2067         if (fdata->start_unit > fdata->stop_unit) {
2068                 dev_warn(&device->cdev->dev, "Start track %d used in "
2069                          "formatting exceeds end track\n", fdata->start_unit);
2070                 return ERR_PTR(-EINVAL);
2071         }
2072         if (dasd_check_blocksize(fdata->blksize) != 0) {
2073                 dev_warn(&device->cdev->dev,
2074                          "The DASD cannot be formatted with block size %d\n",
2075                          fdata->blksize);
2076                 return ERR_PTR(-EINVAL);
2077         }
2078
2079         /*
2080          * fdata->intensity is a bit string that tells us what to do:
2081          *   Bit 0: write record zero
2082          *   Bit 1: write home address, currently not supported
2083          *   Bit 2: invalidate tracks
2084          *   Bit 3: use OS/390 compatible disk layout (cdl)
2085          *   Bit 4: do not allow storage subsystem to modify record zero
2086          * Only some bit combinations do make sense.
2087          */
2088         if (fdata->intensity & 0x10) {
2089                 r0_perm = 0;
2090                 intensity = fdata->intensity & ~0x10;
2091         } else {
2092                 r0_perm = 1;
2093                 intensity = fdata->intensity;
2094         }
2095         switch (intensity) {
2096         case 0x00:      /* Normal format */
2097         case 0x08:      /* Normal format, use cdl. */
2098                 cplength = 2 + rpt;
2099                 datasize = sizeof(struct DE_eckd_data) +
2100                         sizeof(struct LO_eckd_data) +
2101                         rpt * sizeof(struct eckd_count);
2102                 break;
2103         case 0x01:      /* Write record zero and format track. */
2104         case 0x09:      /* Write record zero and format track, use cdl. */
2105                 cplength = 3 + rpt;
2106                 datasize = sizeof(struct DE_eckd_data) +
2107                         sizeof(struct LO_eckd_data) +
2108                         sizeof(struct eckd_count) +
2109                         rpt * sizeof(struct eckd_count);
2110                 break;
2111         case 0x04:      /* Invalidate track. */
2112         case 0x0c:      /* Invalidate track, use cdl. */
2113                 cplength = 3;
2114                 datasize = sizeof(struct DE_eckd_data) +
2115                         sizeof(struct LO_eckd_data) +
2116                         sizeof(struct eckd_count);
2117                 break;
2118         default:
2119                 dev_warn(&device->cdev->dev, "An I/O control call used "
2120                          "incorrect flags 0x%x\n", fdata->intensity);
2121                 return ERR_PTR(-EINVAL);
2122         }
2123         /* Allocate the format ccw request. */
2124         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
2125         if (IS_ERR(fcp))
2126                 return fcp;
2127
2128         data = fcp->data;
2129         ccw = fcp->cpaddr;
2130
2131         switch (intensity & ~0x08) {
2132         case 0x00: /* Normal format. */
2133                 define_extent(ccw++, (struct DE_eckd_data *) data,
2134                               fdata->start_unit, fdata->start_unit,
2135                               DASD_ECKD_CCW_WRITE_CKD, device);
2136                 /* grant subsystem permission to format R0 */
2137                 if (r0_perm)
2138                         ((struct DE_eckd_data *)data)->ga_extended |= 0x04;
2139                 data += sizeof(struct DE_eckd_data);
2140                 ccw[-1].flags |= CCW_FLAG_CC;
2141                 locate_record(ccw++, (struct LO_eckd_data *) data,
2142                               fdata->start_unit, 0, rpt,
2143                               DASD_ECKD_CCW_WRITE_CKD, device,
2144                               fdata->blksize);
2145                 data += sizeof(struct LO_eckd_data);
2146                 break;
2147         case 0x01: /* Write record zero + format track. */
2148                 define_extent(ccw++, (struct DE_eckd_data *) data,
2149                               fdata->start_unit, fdata->start_unit,
2150                               DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2151                               device);
2152                 data += sizeof(struct DE_eckd_data);
2153                 ccw[-1].flags |= CCW_FLAG_CC;
2154                 locate_record(ccw++, (struct LO_eckd_data *) data,
2155                               fdata->start_unit, 0, rpt + 1,
2156                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
2157                               device->block->bp_block);
2158                 data += sizeof(struct LO_eckd_data);
2159                 break;
2160         case 0x04: /* Invalidate track. */
2161                 define_extent(ccw++, (struct DE_eckd_data *) data,
2162                               fdata->start_unit, fdata->start_unit,
2163                               DASD_ECKD_CCW_WRITE_CKD, device);
2164                 data += sizeof(struct DE_eckd_data);
2165                 ccw[-1].flags |= CCW_FLAG_CC;
2166                 locate_record(ccw++, (struct LO_eckd_data *) data,
2167                               fdata->start_unit, 0, 1,
2168                               DASD_ECKD_CCW_WRITE_CKD, device, 8);
2169                 data += sizeof(struct LO_eckd_data);
2170                 break;
2171         }
2172         if (intensity & 0x01) { /* write record zero */
2173                 ect = (struct eckd_count *) data;
2174                 data += sizeof(struct eckd_count);
2175                 ect->cyl = address.cyl;
2176                 ect->head = address.head;
2177                 ect->record = 0;
2178                 ect->kl = 0;
2179                 ect->dl = 8;
2180                 ccw[-1].flags |= CCW_FLAG_CC;
2181                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2182                 ccw->flags = CCW_FLAG_SLI;
2183                 ccw->count = 8;
2184                 ccw->cda = (__u32)(addr_t) ect;
2185                 ccw++;
2186         }
2187         if ((intensity & ~0x08) & 0x04) {       /* erase track */
2188                 ect = (struct eckd_count *) data;
2189                 data += sizeof(struct eckd_count);
2190                 ect->cyl = address.cyl;
2191                 ect->head = address.head;
2192                 ect->record = 1;
2193                 ect->kl = 0;
2194                 ect->dl = 0;
2195                 ccw[-1].flags |= CCW_FLAG_CC;
2196                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2197                 ccw->flags = CCW_FLAG_SLI;
2198                 ccw->count = 8;
2199                 ccw->cda = (__u32)(addr_t) ect;
2200         } else {                /* write remaining records */
2201                 for (i = 0; i < rpt; i++) {
2202                         ect = (struct eckd_count *) data;
2203                         data += sizeof(struct eckd_count);
2204                         ect->cyl = address.cyl;
2205                         ect->head = address.head;
2206                         ect->record = i + 1;
2207                         ect->kl = 0;
2208                         ect->dl = fdata->blksize;
2209                         /* Check for special tracks 0-1 when formatting CDL */
2210                         if ((intensity & 0x08) &&
2211                             fdata->start_unit == 0) {
2212                                 if (i < 3) {
2213                                         ect->kl = 4;
2214                                         ect->dl = sizes_trk0[i] - 4;
2215                                 }
2216                         }
2217                         if ((intensity & 0x08) &&
2218                             fdata->start_unit == 1) {
2219                                 ect->kl = 44;
2220                                 ect->dl = LABEL_SIZE - 44;
2221                         }
2222                         ccw[-1].flags |= CCW_FLAG_CC;
2223                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2224                         ccw->flags = CCW_FLAG_SLI;
2225                         ccw->count = 8;
2226                         ccw->cda = (__u32)(addr_t) ect;
2227                         ccw++;
2228                 }
2229         }
2230         fcp->startdev = device;
2231         fcp->memdev = device;
2232         fcp->retries = 256;
2233         fcp->buildclk = get_clock();
2234         fcp->status = DASD_CQR_FILLED;
2235         return fcp;
2236 }
2237
2238 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2239 {
2240         cqr->status = DASD_CQR_FILLED;
2241         if (cqr->block && (cqr->startdev != cqr->block->base)) {
2242                 dasd_eckd_reset_ccw_to_base_io(cqr);
2243                 cqr->startdev = cqr->block->base;
2244                 cqr->lpm = cqr->block->base->path_data.opm;
2245         }
2246 };
2247
2248 static dasd_erp_fn_t
2249 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2250 {
2251         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2252         struct ccw_device *cdev = device->cdev;
2253
2254         switch (cdev->id.cu_type) {
2255         case 0x3990:
2256         case 0x2105:
2257         case 0x2107:
2258         case 0x1750:
2259                 return dasd_3990_erp_action;
2260         case 0x9343:
2261         case 0x3880:
2262         default:
2263                 return dasd_default_erp_action;
2264         }
2265 }
2266
2267 static dasd_erp_fn_t
2268 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2269 {
2270         return dasd_default_erp_postaction;
2271 }
2272
2273 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2274                                               struct dasd_ccw_req *cqr,
2275                                               struct irb *irb)
2276 {
2277         char mask;
2278         char *sense = NULL;
2279         struct dasd_eckd_private *private;
2280
2281         private = (struct dasd_eckd_private *) device->private;
2282         /* first of all check for state change pending interrupt */
2283         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2284         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2285                 /*
2286                  * for alias only, not in offline processing
2287                  * and only if not suspended
2288                  */
2289                 if (!device->block && private->lcu &&
2290                     device->state == DASD_STATE_ONLINE &&
2291                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2292                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2293                         /*
2294                          * the state change could be caused by an alias
2295                          * reassignment remove device from alias handling
2296                          * to prevent new requests from being scheduled on
2297                          * the wrong alias device
2298                          */
2299                         dasd_alias_remove_device(device);
2300
2301                         /* schedule worker to reload device */
2302                         dasd_reload_device(device);
2303                 }
2304                 dasd_generic_handle_state_change(device);
2305                 return;
2306         }
2307
2308         sense = dasd_get_sense(irb);
2309         if (!sense)
2310                 return;
2311
2312         /* summary unit check */
2313         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2314             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2315                 dasd_alias_handle_summary_unit_check(device, irb);
2316                 return;
2317         }
2318
2319         /* service information message SIM */
2320         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
2321             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
2322                 dasd_3990_erp_handle_sim(device, sense);
2323                 return;
2324         }
2325
2326         /* loss of device reservation is handled via base devices only
2327          * as alias devices may be used with several bases
2328          */
2329         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
2330             (sense[7] == 0x3F) &&
2331             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
2332             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
2333                 if (device->features & DASD_FEATURE_FAILONSLCK)
2334                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
2335                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
2336                 dev_err(&device->cdev->dev,
2337                         "The device reservation was lost\n");
2338         }
2339 }
2340
2341 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
2342                                                struct dasd_device *startdev,
2343                                                struct dasd_block *block,
2344                                                struct request *req,
2345                                                sector_t first_rec,
2346                                                sector_t last_rec,
2347                                                sector_t first_trk,
2348                                                sector_t last_trk,
2349                                                unsigned int first_offs,
2350                                                unsigned int last_offs,
2351                                                unsigned int blk_per_trk,
2352                                                unsigned int blksize)
2353 {
2354         struct dasd_eckd_private *private;
2355         unsigned long *idaws;
2356         struct LO_eckd_data *LO_data;
2357         struct dasd_ccw_req *cqr;
2358         struct ccw1 *ccw;
2359         struct req_iterator iter;
2360         struct bio_vec *bv;
2361         char *dst;
2362         unsigned int off;
2363         int count, cidaw, cplength, datasize;
2364         sector_t recid;
2365         unsigned char cmd, rcmd;
2366         int use_prefix;
2367         struct dasd_device *basedev;
2368
2369         basedev = block->base;
2370         private = (struct dasd_eckd_private *) basedev->private;
2371         if (rq_data_dir(req) == READ)
2372                 cmd = DASD_ECKD_CCW_READ_MT;
2373         else if (rq_data_dir(req) == WRITE)
2374                 cmd = DASD_ECKD_CCW_WRITE_MT;
2375         else
2376                 return ERR_PTR(-EINVAL);
2377
2378         /* Check struct bio and count the number of blocks for the request. */
2379         count = 0;
2380         cidaw = 0;
2381         rq_for_each_segment(bv, req, iter) {
2382                 if (bv->bv_len & (blksize - 1))
2383                         /* Eckd can only do full blocks. */
2384                         return ERR_PTR(-EINVAL);
2385                 count += bv->bv_len >> (block->s2b_shift + 9);
2386 #if defined(CONFIG_64BIT)
2387                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
2388                         cidaw += bv->bv_len >> (block->s2b_shift + 9);
2389 #endif
2390         }
2391         /* Paranoia. */
2392         if (count != last_rec - first_rec + 1)
2393                 return ERR_PTR(-EINVAL);
2394
2395         /* use the prefix command if available */
2396         use_prefix = private->features.feature[8] & 0x01;
2397         if (use_prefix) {
2398                 /* 1x prefix + number of blocks */
2399                 cplength = 2 + count;
2400                 /* 1x prefix + cidaws*sizeof(long) */
2401                 datasize = sizeof(struct PFX_eckd_data) +
2402                         sizeof(struct LO_eckd_data) +
2403                         cidaw * sizeof(unsigned long);
2404         } else {
2405                 /* 1x define extent + 1x locate record + number of blocks */
2406                 cplength = 2 + count;
2407                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
2408                 datasize = sizeof(struct DE_eckd_data) +
2409                         sizeof(struct LO_eckd_data) +
2410                         cidaw * sizeof(unsigned long);
2411         }
2412         /* Find out the number of additional locate record ccws for cdl. */
2413         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
2414                 if (last_rec >= 2*blk_per_trk)
2415                         count = 2*blk_per_trk - first_rec;
2416                 cplength += count;
2417                 datasize += count*sizeof(struct LO_eckd_data);
2418         }
2419         /* Allocate the ccw request. */
2420         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2421                                    startdev);
2422         if (IS_ERR(cqr))
2423                 return cqr;
2424         ccw = cqr->cpaddr;
2425         /* First ccw is define extent or prefix. */
2426         if (use_prefix) {
2427                 if (prefix(ccw++, cqr->data, first_trk,
2428                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
2429                         /* Clock not in sync and XRC is enabled.
2430                          * Try again later.
2431                          */
2432                         dasd_sfree_request(cqr, startdev);
2433                         return ERR_PTR(-EAGAIN);
2434                 }
2435                 idaws = (unsigned long *) (cqr->data +
2436                                            sizeof(struct PFX_eckd_data));
2437         } else {
2438                 if (define_extent(ccw++, cqr->data, first_trk,
2439                                   last_trk, cmd, basedev) == -EAGAIN) {
2440                         /* Clock not in sync and XRC is enabled.
2441                          * Try again later.
2442                          */
2443                         dasd_sfree_request(cqr, startdev);
2444                         return ERR_PTR(-EAGAIN);
2445                 }
2446                 idaws = (unsigned long *) (cqr->data +
2447                                            sizeof(struct DE_eckd_data));
2448         }
2449         /* Build locate_record+read/write/ccws. */
2450         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
2451         recid = first_rec;
2452         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
2453                 /* Only standard blocks so there is just one locate record. */
2454                 ccw[-1].flags |= CCW_FLAG_CC;
2455                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
2456                               last_rec - recid + 1, cmd, basedev, blksize);
2457         }
2458         rq_for_each_segment(bv, req, iter) {
2459                 dst = page_address(bv->bv_page) + bv->bv_offset;
2460                 if (dasd_page_cache) {
2461                         char *copy = kmem_cache_alloc(dasd_page_cache,
2462                                                       GFP_DMA | __GFP_NOWARN);
2463                         if (copy && rq_data_dir(req) == WRITE)
2464                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
2465                         if (copy)
2466                                 dst = copy + bv->bv_offset;
2467                 }
2468                 for (off = 0; off < bv->bv_len; off += blksize) {
2469                         sector_t trkid = recid;
2470                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
2471                         rcmd = cmd;
2472                         count = blksize;
2473                         /* Locate record for cdl special block ? */
2474                         if (private->uses_cdl && recid < 2*blk_per_trk) {
2475                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
2476                                         rcmd |= 0x8;
2477                                         count = dasd_eckd_cdl_reclen(recid);
2478                                         if (count < blksize &&
2479                                             rq_data_dir(req) == READ)
2480                                                 memset(dst + count, 0xe5,
2481                                                        blksize - count);
2482                                 }
2483                                 ccw[-1].flags |= CCW_FLAG_CC;
2484                                 locate_record(ccw++, LO_data++,
2485                                               trkid, recoffs + 1,
2486                                               1, rcmd, basedev, count);
2487                         }
2488                         /* Locate record for standard blocks ? */
2489                         if (private->uses_cdl && recid == 2*blk_per_trk) {
2490                                 ccw[-1].flags |= CCW_FLAG_CC;
2491                                 locate_record(ccw++, LO_data++,
2492                                               trkid, recoffs + 1,
2493                                               last_rec - recid + 1,
2494                                               cmd, basedev, count);
2495                         }
2496                         /* Read/write ccw. */
2497                         ccw[-1].flags |= CCW_FLAG_CC;
2498                         ccw->cmd_code = rcmd;
2499                         ccw->count = count;
2500                         if (idal_is_needed(dst, blksize)) {
2501                                 ccw->cda = (__u32)(addr_t) idaws;
2502                                 ccw->flags = CCW_FLAG_IDA;
2503                                 idaws = idal_create_words(idaws, dst, blksize);
2504                         } else {
2505                                 ccw->cda = (__u32)(addr_t) dst;
2506                                 ccw->flags = 0;
2507                         }
2508                         ccw++;
2509                         dst += blksize;
2510                         recid++;
2511                 }
2512         }
2513         if (blk_noretry_request(req) ||
2514             block->base->features & DASD_FEATURE_FAILFAST)
2515                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2516         cqr->startdev = startdev;
2517         cqr->memdev = startdev;
2518         cqr->block = block;
2519         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2520         cqr->lpm = startdev->path_data.ppm;
2521         cqr->retries = 256;
2522         cqr->buildclk = get_clock();
2523         cqr->status = DASD_CQR_FILLED;
2524         return cqr;
2525 }
2526
2527 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
2528                                                struct dasd_device *startdev,
2529                                                struct dasd_block *block,
2530                                                struct request *req,
2531                                                sector_t first_rec,
2532                                                sector_t last_rec,
2533                                                sector_t first_trk,
2534                                                sector_t last_trk,
2535                                                unsigned int first_offs,
2536                                                unsigned int last_offs,
2537                                                unsigned int blk_per_trk,
2538                                                unsigned int blksize)
2539 {
2540         unsigned long *idaws;
2541         struct dasd_ccw_req *cqr;
2542         struct ccw1 *ccw;
2543         struct req_iterator iter;
2544         struct bio_vec *bv;
2545         char *dst, *idaw_dst;
2546         unsigned int cidaw, cplength, datasize;
2547         unsigned int tlf;
2548         sector_t recid;
2549         unsigned char cmd;
2550         struct dasd_device *basedev;
2551         unsigned int trkcount, count, count_to_trk_end;
2552         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
2553         unsigned char new_track, end_idaw;
2554         sector_t trkid;
2555         unsigned int recoffs;
2556
2557         basedev = block->base;
2558         if (rq_data_dir(req) == READ)
2559                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2560         else if (rq_data_dir(req) == WRITE)
2561                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2562         else
2563                 return ERR_PTR(-EINVAL);
2564
2565         /* Track based I/O needs IDAWs for each page, and not just for
2566          * 64 bit addresses. We need additional idals for pages
2567          * that get filled from two tracks, so we use the number
2568          * of records as upper limit.
2569          */
2570         cidaw = last_rec - first_rec + 1;
2571         trkcount = last_trk - first_trk + 1;
2572
2573         /* 1x prefix + one read/write ccw per track */
2574         cplength = 1 + trkcount;
2575
2576         /* on 31-bit we need space for two 32 bit addresses per page
2577          * on 64-bit one 64 bit address
2578          */
2579         datasize = sizeof(struct PFX_eckd_data) +
2580                 cidaw * sizeof(unsigned long long);
2581
2582         /* Allocate the ccw request. */
2583         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2584                                    startdev);
2585         if (IS_ERR(cqr))
2586                 return cqr;
2587         ccw = cqr->cpaddr;
2588         /* transfer length factor: how many bytes to read from the last track */
2589         if (first_trk == last_trk)
2590                 tlf = last_offs - first_offs + 1;
2591         else
2592                 tlf = last_offs + 1;
2593         tlf *= blksize;
2594
2595         if (prefix_LRE(ccw++, cqr->data, first_trk,
2596                        last_trk, cmd, basedev, startdev,
2597                        1 /* format */, first_offs + 1,
2598                        trkcount, blksize,
2599                        tlf) == -EAGAIN) {
2600                 /* Clock not in sync and XRC is enabled.
2601                  * Try again later.
2602                  */
2603                 dasd_sfree_request(cqr, startdev);
2604                 return ERR_PTR(-EAGAIN);
2605         }
2606
2607         /*
2608          * The translation of request into ccw programs must meet the
2609          * following conditions:
2610          * - all idaws but the first and the last must address full pages
2611          *   (or 2K blocks on 31-bit)
2612          * - the scope of a ccw and it's idal ends with the track boundaries
2613          */
2614         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2615         recid = first_rec;
2616         new_track = 1;
2617         end_idaw = 0;
2618         len_to_track_end = 0;
2619         idaw_dst = NULL;
2620         idaw_len = 0;
2621         rq_for_each_segment(bv, req, iter) {
2622                 dst = page_address(bv->bv_page) + bv->bv_offset;
2623                 seg_len = bv->bv_len;
2624                 while (seg_len) {
2625                         if (new_track) {
2626                                 trkid = recid;
2627                                 recoffs = sector_div(trkid, blk_per_trk);
2628                                 count_to_trk_end = blk_per_trk - recoffs;
2629                                 count = min((last_rec - recid + 1),
2630                                             (sector_t)count_to_trk_end);
2631                                 len_to_track_end = count * blksize;
2632                                 ccw[-1].flags |= CCW_FLAG_CC;
2633                                 ccw->cmd_code = cmd;
2634                                 ccw->count = len_to_track_end;
2635                                 ccw->cda = (__u32)(addr_t)idaws;
2636                                 ccw->flags = CCW_FLAG_IDA;
2637                                 ccw++;
2638                                 recid += count;
2639                                 new_track = 0;
2640                                 /* first idaw for a ccw may start anywhere */
2641                                 if (!idaw_dst)
2642                                         idaw_dst = dst;
2643                         }
2644                         /* If we start a new idaw, we must make sure that it
2645                          * starts on an IDA_BLOCK_SIZE boundary.
2646                          * If we continue an idaw, we must make sure that the
2647                          * current segment begins where the so far accumulated
2648                          * idaw ends
2649                          */
2650                         if (!idaw_dst) {
2651                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2652                                         dasd_sfree_request(cqr, startdev);
2653                                         return ERR_PTR(-ERANGE);
2654                                 } else
2655                                         idaw_dst = dst;
2656                         }
2657                         if ((idaw_dst + idaw_len) != dst) {
2658                                 dasd_sfree_request(cqr, startdev);
2659                                 return ERR_PTR(-ERANGE);
2660                         }
2661                         part_len = min(seg_len, len_to_track_end);
2662                         seg_len -= part_len;
2663                         dst += part_len;
2664                         idaw_len += part_len;
2665                         len_to_track_end -= part_len;
2666                         /* collected memory area ends on an IDA_BLOCK border,
2667                          * -> create an idaw
2668                          * idal_create_words will handle cases where idaw_len
2669                          * is larger then IDA_BLOCK_SIZE
2670                          */
2671                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2672                                 end_idaw = 1;
2673                         /* We also need to end the idaw at track end */
2674                         if (!len_to_track_end) {
2675                                 new_track = 1;
2676                                 end_idaw = 1;
2677                         }
2678                         if (end_idaw) {
2679                                 idaws = idal_create_words(idaws, idaw_dst,
2680                                                           idaw_len);
2681                                 idaw_dst = NULL;
2682                                 idaw_len = 0;
2683                                 end_idaw = 0;
2684                         }
2685                 }
2686         }
2687
2688         if (blk_noretry_request(req) ||
2689             block->base->features & DASD_FEATURE_FAILFAST)
2690                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2691         cqr->startdev = startdev;
2692         cqr->memdev = startdev;
2693         cqr->block = block;
2694         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2695         cqr->lpm = startdev->path_data.ppm;
2696         cqr->retries = 256;
2697         cqr->buildclk = get_clock();
2698         cqr->status = DASD_CQR_FILLED;
2699         return cqr;
2700 }
2701
2702 static int prepare_itcw(struct itcw *itcw,
2703                         unsigned int trk, unsigned int totrk, int cmd,
2704                         struct dasd_device *basedev,
2705                         struct dasd_device *startdev,
2706                         unsigned int rec_on_trk, int count,
2707                         unsigned int blksize,
2708                         unsigned int total_data_size,
2709                         unsigned int tlf,
2710                         unsigned int blk_per_trk)
2711 {
2712         struct PFX_eckd_data pfxdata;
2713         struct dasd_eckd_private *basepriv, *startpriv;
2714         struct DE_eckd_data *dedata;
2715         struct LRE_eckd_data *lredata;
2716         struct dcw *dcw;
2717
2718         u32 begcyl, endcyl;
2719         u16 heads, beghead, endhead;
2720         u8 pfx_cmd;
2721
2722         int rc = 0;
2723         int sector = 0;
2724         int dn, d;
2725
2726
2727         /* setup prefix data */
2728         basepriv = (struct dasd_eckd_private *) basedev->private;
2729         startpriv = (struct dasd_eckd_private *) startdev->private;
2730         dedata = &pfxdata.define_extent;
2731         lredata = &pfxdata.locate_record;
2732
2733         memset(&pfxdata, 0, sizeof(pfxdata));
2734         pfxdata.format = 1; /* PFX with LRE */
2735         pfxdata.base_address = basepriv->ned->unit_addr;
2736         pfxdata.base_lss = basepriv->ned->ID;
2737         pfxdata.validity.define_extent = 1;
2738
2739         /* private uid is kept up to date, conf_data may be outdated */
2740         if (startpriv->uid.type != UA_BASE_DEVICE) {
2741                 pfxdata.validity.verify_base = 1;
2742                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2743                         pfxdata.validity.hyper_pav = 1;
2744         }
2745
2746         switch (cmd) {
2747         case DASD_ECKD_CCW_READ_TRACK_DATA:
2748                 dedata->mask.perm = 0x1;
2749                 dedata->attributes.operation = basepriv->attrib.operation;
2750                 dedata->blk_size = blksize;
2751                 dedata->ga_extended |= 0x42;
2752                 lredata->operation.orientation = 0x0;
2753                 lredata->operation.operation = 0x0C;
2754                 lredata->auxiliary.check_bytes = 0x01;
2755                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2756                 break;
2757         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2758                 dedata->mask.perm = 0x02;
2759                 dedata->attributes.operation = basepriv->attrib.operation;
2760                 dedata->blk_size = blksize;
2761                 rc = check_XRC_on_prefix(&pfxdata, basedev);
2762                 dedata->ga_extended |= 0x42;
2763                 lredata->operation.orientation = 0x0;
2764                 lredata->operation.operation = 0x3F;
2765                 lredata->extended_operation = 0x23;
2766                 lredata->auxiliary.check_bytes = 0x2;
2767                 pfx_cmd = DASD_ECKD_CCW_PFX;
2768                 break;
2769         default:
2770                 DBF_DEV_EVENT(DBF_ERR, basedev,
2771                               "prepare itcw, unknown opcode 0x%x", cmd);
2772                 BUG();
2773                 break;
2774         }
2775         if (rc)
2776                 return rc;
2777
2778         dedata->attributes.mode = 0x3;  /* ECKD */
2779
2780         heads = basepriv->rdc_data.trk_per_cyl;
2781         begcyl = trk / heads;
2782         beghead = trk % heads;
2783         endcyl = totrk / heads;
2784         endhead = totrk % heads;
2785
2786         /* check for sequential prestage - enhance cylinder range */
2787         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2788             dedata->attributes.operation == DASD_SEQ_ACCESS) {
2789
2790                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2791                         endcyl += basepriv->attrib.nr_cyl;
2792                 else
2793                         endcyl = (basepriv->real_cyl - 1);
2794         }
2795
2796         set_ch_t(&dedata->beg_ext, begcyl, beghead);
2797         set_ch_t(&dedata->end_ext, endcyl, endhead);
2798
2799         dedata->ep_format = 0x20; /* records per track is valid */
2800         dedata->ep_rec_per_track = blk_per_trk;
2801
2802         if (rec_on_trk) {
2803                 switch (basepriv->rdc_data.dev_type) {
2804                 case 0x3390:
2805                         dn = ceil_quot(blksize + 6, 232);
2806                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
2807                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
2808                         break;
2809                 case 0x3380:
2810                         d = 7 + ceil_quot(blksize + 12, 32);
2811                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
2812                         break;
2813                 }
2814         }
2815
2816         lredata->auxiliary.length_valid = 1;
2817         lredata->auxiliary.length_scope = 1;
2818         lredata->auxiliary.imbedded_ccw_valid = 1;
2819         lredata->length = tlf;
2820         lredata->imbedded_ccw = cmd;
2821         lredata->count = count;
2822         lredata->sector = sector;
2823         set_ch_t(&lredata->seek_addr, begcyl, beghead);
2824         lredata->search_arg.cyl = lredata->seek_addr.cyl;
2825         lredata->search_arg.head = lredata->seek_addr.head;
2826         lredata->search_arg.record = rec_on_trk;
2827
2828         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
2829                      &pfxdata, sizeof(pfxdata), total_data_size);
2830         return IS_ERR(dcw) ? PTR_ERR(dcw) : 0;
2831 }
2832
2833 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
2834                                                struct dasd_device *startdev,
2835                                                struct dasd_block *block,
2836                                                struct request *req,
2837                                                sector_t first_rec,
2838                                                sector_t last_rec,
2839                                                sector_t first_trk,
2840                                                sector_t last_trk,
2841                                                unsigned int first_offs,
2842                                                unsigned int last_offs,
2843                                                unsigned int blk_per_trk,
2844                                                unsigned int blksize)
2845 {
2846         struct dasd_ccw_req *cqr;
2847         struct req_iterator iter;
2848         struct bio_vec *bv;
2849         char *dst;
2850         unsigned int trkcount, ctidaw;
2851         unsigned char cmd;
2852         struct dasd_device *basedev;
2853         unsigned int tlf;
2854         struct itcw *itcw;
2855         struct tidaw *last_tidaw = NULL;
2856         int itcw_op;
2857         size_t itcw_size;
2858         u8 tidaw_flags;
2859         unsigned int seg_len, part_len, len_to_track_end;
2860         unsigned char new_track;
2861         sector_t recid, trkid;
2862         unsigned int offs;
2863         unsigned int count, count_to_trk_end;
2864         int ret;
2865
2866         basedev = block->base;
2867         if (rq_data_dir(req) == READ) {
2868                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2869                 itcw_op = ITCW_OP_READ;
2870         } else if (rq_data_dir(req) == WRITE) {
2871                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2872                 itcw_op = ITCW_OP_WRITE;
2873         } else
2874                 return ERR_PTR(-EINVAL);
2875
2876         /* trackbased I/O needs address all memory via TIDAWs,
2877          * not just for 64 bit addresses. This allows us to map
2878          * each segment directly to one tidaw.
2879          * In the case of write requests, additional tidaws may
2880          * be needed when a segment crosses a track boundary.
2881          */
2882         trkcount = last_trk - first_trk + 1;
2883         ctidaw = 0;
2884         rq_for_each_segment(bv, req, iter) {
2885                 ++ctidaw;
2886         }
2887         if (rq_data_dir(req) == WRITE)
2888                 ctidaw += (last_trk - first_trk);
2889
2890         /* Allocate the ccw request. */
2891         itcw_size = itcw_calc_size(0, ctidaw, 0);
2892         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2893         if (IS_ERR(cqr))
2894                 return cqr;
2895
2896         /* transfer length factor: how many bytes to read from the last track */
2897         if (first_trk == last_trk)
2898                 tlf = last_offs - first_offs + 1;
2899         else
2900                 tlf = last_offs + 1;
2901         tlf *= blksize;
2902
2903         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
2904         if (IS_ERR(itcw)) {
2905                 ret = -EINVAL;
2906                 goto out_error;
2907         }
2908         cqr->cpaddr = itcw_get_tcw(itcw);
2909         if (prepare_itcw(itcw, first_trk, last_trk,
2910                          cmd, basedev, startdev,
2911                          first_offs + 1,
2912                          trkcount, blksize,
2913                          (last_rec - first_rec + 1) * blksize,
2914                          tlf, blk_per_trk) == -EAGAIN) {
2915                 /* Clock not in sync and XRC is enabled.
2916                  * Try again later.
2917                  */
2918                 ret = -EAGAIN;
2919                 goto out_error;
2920         }
2921         len_to_track_end = 0;
2922         /*
2923          * A tidaw can address 4k of memory, but must not cross page boundaries
2924          * We can let the block layer handle this by setting
2925          * blk_queue_segment_boundary to page boundaries and
2926          * blk_max_segment_size to page size when setting up the request queue.
2927          * For write requests, a TIDAW must not cross track boundaries, because
2928          * we have to set the CBC flag on the last tidaw for each track.
2929          */
2930         if (rq_data_dir(req) == WRITE) {
2931                 new_track = 1;
2932                 recid = first_rec;
2933                 rq_for_each_segment(bv, req, iter) {
2934                         dst = page_address(bv->bv_page) + bv->bv_offset;
2935                         seg_len = bv->bv_len;
2936                         while (seg_len) {
2937                                 if (new_track) {
2938                                         trkid = recid;
2939                                         offs = sector_div(trkid, blk_per_trk);
2940                                         count_to_trk_end = blk_per_trk - offs;
2941                                         count = min((last_rec - recid + 1),
2942                                                     (sector_t)count_to_trk_end);
2943                                         len_to_track_end = count * blksize;
2944                                         recid += count;
2945                                         new_track = 0;
2946                                 }
2947                                 part_len = min(seg_len, len_to_track_end);
2948                                 seg_len -= part_len;
2949                                 len_to_track_end -= part_len;
2950                                 /* We need to end the tidaw at track end */
2951                                 if (!len_to_track_end) {
2952                                         new_track = 1;
2953                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
2954                                 } else
2955                                         tidaw_flags = 0;
2956                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
2957                                                             dst, part_len);
2958                                 if (IS_ERR(last_tidaw)) {
2959                                         ret = -EINVAL;
2960                                         goto out_error;
2961                                 }
2962                                 dst += part_len;
2963                         }
2964                 }
2965         } else {
2966                 rq_for_each_segment(bv, req, iter) {
2967                         dst = page_address(bv->bv_page) + bv->bv_offset;
2968                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
2969                                                     dst, bv->bv_len);
2970                         if (IS_ERR(last_tidaw)) {
2971                                 ret = -EINVAL;
2972                                 goto out_error;
2973                         }
2974                 }
2975         }
2976         last_tidaw->flags |= TIDAW_FLAGS_LAST;
2977         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
2978         itcw_finalize(itcw);
2979
2980         if (blk_noretry_request(req) ||
2981             block->base->features & DASD_FEATURE_FAILFAST)
2982                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2983         cqr->cpmode = 1;
2984         cqr->startdev = startdev;
2985         cqr->memdev = startdev;
2986         cqr->block = block;
2987         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2988         cqr->lpm = startdev->path_data.ppm;
2989         cqr->retries = 256;
2990         cqr->buildclk = get_clock();
2991         cqr->status = DASD_CQR_FILLED;
2992         return cqr;
2993 out_error:
2994         dasd_sfree_request(cqr, startdev);
2995         return ERR_PTR(ret);
2996 }
2997
2998 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
2999                                                struct dasd_block *block,
3000                                                struct request *req)
3001 {
3002         int cmdrtd, cmdwtd;
3003         int use_prefix;
3004         int fcx_multitrack;
3005         struct dasd_eckd_private *private;
3006         struct dasd_device *basedev;
3007         sector_t first_rec, last_rec;
3008         sector_t first_trk, last_trk;
3009         unsigned int first_offs, last_offs;
3010         unsigned int blk_per_trk, blksize;
3011         int cdlspecial;
3012         unsigned int data_size;
3013         struct dasd_ccw_req *cqr;
3014
3015         basedev = block->base;
3016         private = (struct dasd_eckd_private *) basedev->private;
3017
3018         /* Calculate number of blocks/records per track. */
3019         blksize = block->bp_block;
3020         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3021         if (blk_per_trk == 0)
3022                 return ERR_PTR(-EINVAL);
3023         /* Calculate record id of first and last block. */
3024         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3025         first_offs = sector_div(first_trk, blk_per_trk);
3026         last_rec = last_trk =
3027                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3028         last_offs = sector_div(last_trk, blk_per_trk);
3029         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3030
3031         fcx_multitrack = private->features.feature[40] & 0x20;
3032         data_size = blk_rq_bytes(req);
3033         /* tpm write request add CBC data on each track boundary */
3034         if (rq_data_dir(req) == WRITE)
3035                 data_size += (last_trk - first_trk) * 4;
3036
3037         /* is read track data and write track data in command mode supported? */
3038         cmdrtd = private->features.feature[9] & 0x20;
3039         cmdwtd = private->features.feature[12] & 0x40;
3040         use_prefix = private->features.feature[8] & 0x01;
3041
3042         cqr = NULL;
3043         if (cdlspecial || dasd_page_cache) {
3044                 /* do nothing, just fall through to the cmd mode single case */
3045         } else if ((data_size <= private->fcx_max_data)
3046                    && (fcx_multitrack || (first_trk == last_trk))) {
3047                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3048                                                     first_rec, last_rec,
3049                                                     first_trk, last_trk,
3050                                                     first_offs, last_offs,
3051                                                     blk_per_trk, blksize);
3052                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3053                     (PTR_ERR(cqr) != -ENOMEM))
3054                         cqr = NULL;
3055         } else if (use_prefix &&
3056                    (((rq_data_dir(req) == READ) && cmdrtd) ||
3057                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3058                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3059                                                    first_rec, last_rec,
3060                                                    first_trk, last_trk,
3061                                                    first_offs, last_offs,
3062                                                    blk_per_trk, blksize);
3063                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3064                     (PTR_ERR(cqr) != -ENOMEM))
3065                         cqr = NULL;
3066         }
3067         if (!cqr)
3068                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3069                                                     first_rec, last_rec,
3070                                                     first_trk, last_trk,
3071                                                     first_offs, last_offs,
3072                                                     blk_per_trk, blksize);
3073         return cqr;
3074 }
3075
3076 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
3077                                                struct dasd_block *block,
3078                                                struct request *req)
3079 {
3080         unsigned long *idaws;
3081         struct dasd_device *basedev;
3082         struct dasd_ccw_req *cqr;
3083         struct ccw1 *ccw;
3084         struct req_iterator iter;
3085         struct bio_vec *bv;
3086         char *dst;
3087         unsigned char cmd;
3088         unsigned int trkcount;
3089         unsigned int seg_len, len_to_track_end;
3090         unsigned int first_offs;
3091         unsigned int cidaw, cplength, datasize;
3092         sector_t first_trk, last_trk;
3093         unsigned int pfx_datasize;
3094
3095         /*
3096          * raw track access needs to be mutiple of 64k and on 64k boundary
3097          */
3098         if ((blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK) != 0) {
3099                 cqr = ERR_PTR(-EINVAL);
3100                 goto out;
3101         }
3102         if (((blk_rq_pos(req) + blk_rq_sectors(req)) %
3103              DASD_RAW_SECTORS_PER_TRACK) != 0) {
3104                 cqr = ERR_PTR(-EINVAL);
3105                 goto out;
3106         }
3107
3108         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3109         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3110                 DASD_RAW_SECTORS_PER_TRACK;
3111         trkcount = last_trk - first_trk + 1;
3112         first_offs = 0;
3113         basedev = block->base;
3114
3115         if (rq_data_dir(req) == READ)
3116                 cmd = DASD_ECKD_CCW_READ_TRACK;
3117         else if (rq_data_dir(req) == WRITE)
3118                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3119         else {
3120                 cqr = ERR_PTR(-EINVAL);
3121                 goto out;
3122         }
3123
3124         /*
3125          * Raw track based I/O needs IDAWs for each page,
3126          * and not just for 64 bit addresses.
3127          */
3128         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3129
3130         /* 1x prefix + one read/write ccw per track */
3131         cplength = 1 + trkcount;
3132
3133         /*
3134          * struct PFX_eckd_data has up to 2 byte as extended parameter
3135          * this is needed for write full track and has to be mentioned
3136          * separately
3137          * add 8 instead of 2 to keep 8 byte boundary
3138          */
3139         pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
3140
3141         datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
3142
3143         /* Allocate the ccw request. */
3144         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3145                                    datasize, startdev);
3146         if (IS_ERR(cqr))
3147                 goto out;
3148         ccw = cqr->cpaddr;
3149
3150         if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
3151                        basedev, startdev, 1 /* format */, first_offs + 1,
3152                        trkcount, 0, 0) == -EAGAIN) {
3153                 /* Clock not in sync and XRC is enabled.
3154                  * Try again later.
3155                  */
3156                 dasd_sfree_request(cqr, startdev);
3157                 cqr = ERR_PTR(-EAGAIN);
3158                 goto out;
3159         }
3160
3161         idaws = (unsigned long *)(cqr->data + pfx_datasize);
3162
3163         len_to_track_end = 0;
3164
3165         rq_for_each_segment(bv, req, iter) {
3166                 dst = page_address(bv->bv_page) + bv->bv_offset;
3167                 seg_len = bv->bv_len;
3168                 if (!len_to_track_end) {
3169                         ccw[-1].flags |= CCW_FLAG_CC;
3170                         ccw->cmd_code = cmd;
3171                         /* maximum 3390 track size */
3172                         ccw->count = 57326;
3173                         /* 64k map to one track */
3174                         len_to_track_end = 65536;
3175                         ccw->cda = (__u32)(addr_t)idaws;
3176                         ccw->flags |= CCW_FLAG_IDA;
3177                         ccw->flags |= CCW_FLAG_SLI;
3178                         ccw++;
3179                 }
3180                 len_to_track_end -= seg_len;
3181                 idaws = idal_create_words(idaws, dst, seg_len);
3182         }
3183
3184         if (blk_noretry_request(req) ||
3185             block->base->features & DASD_FEATURE_FAILFAST)
3186                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3187         cqr->startdev = startdev;
3188         cqr->memdev = startdev;
3189         cqr->block = block;
3190         cqr->expires = startdev->default_expires * HZ;
3191         cqr->lpm = startdev->path_data.ppm;
3192         cqr->retries = 256;
3193         cqr->buildclk = get_clock();
3194         cqr->status = DASD_CQR_FILLED;
3195
3196         if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
3197                 cqr = NULL;
3198 out:
3199         return cqr;
3200 }
3201
3202
3203 static int
3204 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3205 {
3206         struct dasd_eckd_private *private;
3207         struct ccw1 *ccw;
3208         struct req_iterator iter;
3209         struct bio_vec *bv;
3210         char *dst, *cda;
3211         unsigned int blksize, blk_per_trk, off;
3212         sector_t recid;
3213         int status;
3214
3215         if (!dasd_page_cache)
3216                 goto out;
3217         private = (struct dasd_eckd_private *) cqr->block->base->private;
3218         blksize = cqr->block->bp_block;
3219         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3220         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3221         ccw = cqr->cpaddr;
3222         /* Skip over define extent & locate record. */
3223         ccw++;
3224         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3225                 ccw++;
3226         rq_for_each_segment(bv, req, iter) {
3227                 dst = page_address(bv->bv_page) + bv->bv_offset;
3228                 for (off = 0; off < bv->bv_len; off += blksize) {
3229                         /* Skip locate record. */
3230                         if (private->uses_cdl && recid <= 2*blk_per_trk)
3231                                 ccw++;
3232                         if (dst) {
3233                                 if (ccw->flags & CCW_FLAG_IDA)
3234                                         cda = *((char **)((addr_t) ccw->cda));
3235                                 else
3236                                         cda = (char *)((addr_t) ccw->cda);
3237                                 if (dst != cda) {
3238                                         if (rq_data_dir(req) == READ)
3239                                                 memcpy(dst, cda, bv->bv_len);
3240                                         kmem_cache_free(dasd_page_cache,
3241                                             (void *)((addr_t)cda & PAGE_MASK));
3242                                 }
3243                                 dst = NULL;
3244                         }
3245                         ccw++;
3246                         recid++;
3247                 }
3248         }
3249 out:
3250         status = cqr->status == DASD_CQR_DONE;
3251         dasd_sfree_request(cqr, cqr->memdev);
3252         return status;
3253 }
3254
3255 /*
3256  * Modify ccw/tcw in cqr so it can be started on a base device.
3257  *
3258  * Note that this is not enough to restart the cqr!
3259  * Either reset cqr->startdev as well (summary unit check handling)
3260  * or restart via separate cqr (as in ERP handling).
3261  */
3262 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3263 {
3264         struct ccw1 *ccw;
3265         struct PFX_eckd_data *pfxdata;
3266         struct tcw *tcw;
3267         struct tccb *tccb;
3268         struct dcw *dcw;
3269
3270         if (cqr->cpmode == 1) {
3271                 tcw = cqr->cpaddr;
3272                 tccb = tcw_get_tccb(tcw);
3273                 dcw = (struct dcw *)&tccb->tca[0];
3274                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
3275                 pfxdata->validity.verify_base = 0;
3276                 pfxdata->validity.hyper_pav = 0;
3277         } else {
3278                 ccw = cqr->cpaddr;
3279                 pfxdata = cqr->data;
3280                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
3281                         pfxdata->validity.verify_base = 0;
3282                         pfxdata->validity.hyper_pav = 0;
3283                 }
3284         }
3285 }
3286
3287 #define DASD_ECKD_CHANQ_MAX_SIZE 4
3288
3289 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
3290                                                      struct dasd_block *block,
3291                                                      struct request *req)
3292 {
3293         struct dasd_eckd_private *private;
3294         struct dasd_device *startdev;
3295         unsigned long flags;
3296         struct dasd_ccw_req *cqr;
3297
3298         startdev = dasd_alias_get_start_dev(base);
3299         if (!startdev)
3300                 startdev = base;
3301         private = (struct dasd_eckd_private *) startdev->private;
3302         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
3303                 return ERR_PTR(-EBUSY);
3304
3305         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
3306         private->count++;
3307         if ((base->features & DASD_FEATURE_USERAW))
3308                 cqr = dasd_raw_build_cp(startdev, block, req);
3309         else
3310                 cqr = dasd_eckd_build_cp(startdev, block, req);
3311         if (IS_ERR(cqr))
3312                 private->count--;
3313         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
3314         return cqr;
3315 }
3316
3317 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
3318                                    struct request *req)
3319 {
3320         struct dasd_eckd_private *private;
3321         unsigned long flags;
3322
3323         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
3324         private = (struct dasd_eckd_private *) cqr->memdev->private;
3325         private->count--;
3326         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
3327         return dasd_eckd_free_cp(cqr, req);
3328 }
3329
3330 static int
3331 dasd_eckd_fill_info(struct dasd_device * device,
3332                     struct dasd_information2_t * info)
3333 {
3334         struct dasd_eckd_private *private;
3335
3336         private = (struct dasd_eckd_private *) device->private;
3337         info->label_block = 2;
3338         info->FBA_layout = private->uses_cdl ? 0 : 1;
3339         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
3340         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
3341         memcpy(info->characteristics, &private->rdc_data,
3342                sizeof(struct dasd_eckd_characteristics));
3343         info->confdata_size = min((unsigned long)private->conf_len,
3344                                   sizeof(info->configuration_data));
3345         memcpy(info->configuration_data, private->conf_data,
3346                info->confdata_size);
3347         return 0;
3348 }
3349
3350 /*
3351  * SECTION: ioctl functions for eckd devices.
3352  */
3353
3354 /*
3355  * Release device ioctl.
3356  * Buils a channel programm to releases a prior reserved
3357  * (see dasd_eckd_reserve) device.
3358  */
3359 static int
3360 dasd_eckd_release(struct dasd_device *device)
3361 {
3362         struct dasd_ccw_req *cqr;
3363         int rc;
3364         struct ccw1 *ccw;
3365         int useglobal;
3366
3367         if (!capable(CAP_SYS_ADMIN))
3368                 return -EACCES;
3369
3370         useglobal = 0;
3371         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3372         if (IS_ERR(cqr)) {
3373                 mutex_lock(&dasd_reserve_mutex);
3374                 useglobal = 1;
3375                 cqr = &dasd_reserve_req->cqr;
3376                 memset(cqr, 0, sizeof(*cqr));
3377                 memset(&dasd_reserve_req->ccw, 0,
3378                        sizeof(dasd_reserve_req->ccw));
3379                 cqr->cpaddr = &dasd_reserve_req->ccw;
3380                 cqr->data = &dasd_reserve_req->data;
3381                 cqr->magic = DASD_ECKD_MAGIC;
3382         }
3383         ccw = cqr->cpaddr;
3384         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
3385         ccw->flags |= CCW_FLAG_SLI;
3386         ccw->count = 32;
3387         ccw->cda = (__u32)(addr_t) cqr->data;
3388         cqr->startdev = device;
3389         cqr->memdev = device;
3390         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3391         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3392         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3393         cqr->expires = 2 * HZ;
3394         cqr->buildclk = get_clock();
3395         cqr->status = DASD_CQR_FILLED;
3396
3397         rc = dasd_sleep_on_immediatly(cqr);
3398         if (!rc)
3399                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3400
3401         if (useglobal)
3402                 mutex_unlock(&dasd_reserve_mutex);
3403         else
3404                 dasd_sfree_request(cqr, cqr->memdev);
3405         return rc;
3406 }
3407
3408 /*
3409  * Reserve device ioctl.
3410  * Options are set to 'synchronous wait for interrupt' and
3411  * 'timeout the request'. This leads to a terminate IO if
3412  * the interrupt is outstanding for a certain time.
3413  */
3414 static int
3415 dasd_eckd_reserve(struct dasd_device *device)
3416 {
3417         struct dasd_ccw_req *cqr;
3418         int rc;
3419         struct ccw1 *ccw;
3420         int useglobal;
3421
3422         if (!capable(CAP_SYS_ADMIN))
3423                 return -EACCES;
3424
3425         useglobal = 0;
3426         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3427         if (IS_ERR(cqr)) {
3428                 mutex_lock(&dasd_reserve_mutex);
3429                 useglobal = 1;
3430                 cqr = &dasd_reserve_req->cqr;
3431                 memset(cqr, 0, sizeof(*cqr));
3432                 memset(&dasd_reserve_req->ccw, 0,
3433                        sizeof(dasd_reserve_req->ccw));
3434                 cqr->cpaddr = &dasd_reserve_req->ccw;
3435                 cqr->data = &dasd_reserve_req->data;
3436                 cqr->magic = DASD_ECKD_MAGIC;
3437         }
3438         ccw = cqr->cpaddr;
3439         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
3440         ccw->flags |= CCW_FLAG_SLI;
3441         ccw->count = 32;
3442         ccw->cda = (__u32)(addr_t) cqr->data;
3443         cqr->startdev = device;
3444         cqr->memdev = device;
3445         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3446         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3447         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3448         cqr->expires = 2 * HZ;
3449         cqr->buildclk = get_clock();
3450         cqr->status = DASD_CQR_FILLED;
3451
3452         rc = dasd_sleep_on_immediatly(cqr);
3453         if (!rc)
3454                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3455
3456         if (useglobal)
3457                 mutex_unlock(&dasd_reserve_mutex);
3458         else
3459                 dasd_sfree_request(cqr, cqr->memdev);
3460         return rc;
3461 }
3462
3463 /*
3464  * Steal lock ioctl - unconditional reserve device.
3465  * Buils a channel programm to break a device's reservation.
3466  * (unconditional reserve)
3467  */
3468 static int
3469 dasd_eckd_steal_lock(struct dasd_device *device)
3470 {
3471         struct dasd_ccw_req *cqr;
3472         int rc;
3473         struct ccw1 *ccw;
3474         int useglobal;
3475
3476         if (!capable(CAP_SYS_ADMIN))
3477                 return -EACCES;
3478
3479         useglobal = 0;
3480         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3481         if (IS_ERR(cqr)) {
3482                 mutex_lock(&dasd_reserve_mutex);
3483                 useglobal = 1;
3484                 cqr = &dasd_reserve_req->cqr;
3485                 memset(cqr, 0, sizeof(*cqr));
3486                 memset(&dasd_reserve_req->ccw, 0,
3487                        sizeof(dasd_reserve_req->ccw));
3488                 cqr->cpaddr = &dasd_reserve_req->ccw;
3489                 cqr->data = &dasd_reserve_req->data;
3490                 cqr->magic = DASD_ECKD_MAGIC;
3491         }
3492         ccw = cqr->cpaddr;
3493         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
3494         ccw->flags |= CCW_FLAG_SLI;
3495         ccw->count = 32;
3496         ccw->cda = (__u32)(addr_t) cqr->data;
3497         cqr->startdev = device;
3498         cqr->memdev = device;
3499         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3500         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3501         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3502         cqr->expires = 2 * HZ;
3503         cqr->buildclk = get_clock();
3504         cqr->status = DASD_CQR_FILLED;
3505
3506         rc = dasd_sleep_on_immediatly(cqr);
3507         if (!rc)
3508                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3509
3510         if (useglobal)
3511                 mutex_unlock(&dasd_reserve_mutex);
3512         else
3513                 dasd_sfree_request(cqr, cqr->memdev);
3514         return rc;
3515 }
3516
3517 /*
3518  * SNID - Sense Path Group ID
3519  * This ioctl may be used in situations where I/O is stalled due to
3520  * a reserve, so if the normal dasd_smalloc_request fails, we use the
3521  * preallocated dasd_reserve_req.
3522  */
3523 static int dasd_eckd_snid(struct dasd_device *device,
3524                           void __user *argp)
3525 {
3526         struct dasd_ccw_req *cqr;
3527         int rc;
3528         struct ccw1 *ccw;
3529         int useglobal;
3530         struct dasd_snid_ioctl_data usrparm;
3531
3532         if (!capable(CAP_SYS_ADMIN))
3533                 return -EACCES;
3534
3535         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3536                 return -EFAULT;
3537
3538         useglobal = 0;
3539         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
3540                                    sizeof(struct dasd_snid_data), device);
3541         if (IS_ERR(cqr)) {
3542                 mutex_lock(&dasd_reserve_mutex);
3543                 useglobal = 1;
3544                 cqr = &dasd_reserve_req->cqr;
3545                 memset(cqr, 0, sizeof(*cqr));
3546                 memset(&dasd_reserve_req->ccw, 0,
3547                        sizeof(dasd_reserve_req->ccw));
3548                 cqr->cpaddr = &dasd_reserve_req->ccw;
3549                 cqr->data = &dasd_reserve_req->data;
3550                 cqr->magic = DASD_ECKD_MAGIC;
3551         }
3552         ccw = cqr->cpaddr;
3553         ccw->cmd_code = DASD_ECKD_CCW_SNID;
3554         ccw->flags |= CCW_FLAG_SLI;
3555         ccw->count = 12;
3556         ccw->cda = (__u32)(addr_t) cqr->data;
3557         cqr->startdev = device;
3558         cqr->memdev = device;
3559         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3560         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3561         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
3562         cqr->retries = 5;
3563         cqr->expires = 10 * HZ;
3564         cqr->buildclk = get_clock();
3565         cqr->status = DASD_CQR_FILLED;
3566         cqr->lpm = usrparm.path_mask;
3567
3568         rc = dasd_sleep_on_immediatly(cqr);
3569         /* verify that I/O processing didn't modify the path mask */
3570         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
3571                 rc = -EIO;
3572         if (!rc) {
3573                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
3574                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
3575                         rc = -EFAULT;
3576         }
3577
3578         if (useglobal)
3579                 mutex_unlock(&dasd_reserve_mutex);
3580         else
3581                 dasd_sfree_request(cqr, cqr->memdev);
3582         return rc;
3583 }
3584
3585 /*
3586  * Read performance statistics
3587  */
3588 static int
3589 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
3590 {
3591         struct dasd_psf_prssd_data *prssdp;
3592         struct dasd_rssd_perf_stats_t *stats;
3593         struct dasd_ccw_req *cqr;
3594         struct ccw1 *ccw;
3595         int rc;
3596
3597         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
3598                                    (sizeof(struct dasd_psf_prssd_data) +
3599                                     sizeof(struct dasd_rssd_perf_stats_t)),
3600                                    device);
3601         if (IS_ERR(cqr)) {
3602                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3603                             "Could not allocate initialization request");
3604                 return PTR_ERR(cqr);
3605         }
3606         cqr->startdev = device;
3607         cqr->memdev = device;
3608         cqr->retries = 0;
3609         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3610         cqr->expires = 10 * HZ;
3611
3612         /* Prepare for Read Subsystem Data */
3613         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3614         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
3615         prssdp->order = PSF_ORDER_PRSSD;
3616         prssdp->suborder = 0x01;        /* Performance Statistics */
3617         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
3618
3619         ccw = cqr->cpaddr;
3620         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3621         ccw->count = sizeof(struct dasd_psf_prssd_data);
3622         ccw->flags |= CCW_FLAG_CC;
3623         ccw->cda = (__u32)(addr_t) prssdp;
3624
3625         /* Read Subsystem Data - Performance Statistics */
3626         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3627         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
3628
3629         ccw++;
3630         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3631         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
3632         ccw->cda = (__u32)(addr_t) stats;
3633
3634         cqr->buildclk = get_clock();
3635         cqr->status = DASD_CQR_FILLED;
3636         rc = dasd_sleep_on(cqr);
3637         if (rc == 0) {
3638                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3639                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3640                 if (copy_to_user(argp, stats,
3641                                  sizeof(struct dasd_rssd_perf_stats_t)))
3642                         rc = -EFAULT;
3643         }
3644         dasd_sfree_request(cqr, cqr->memdev);
3645         return rc;
3646 }
3647
3648 /*
3649  * Get attributes (cache operations)
3650  * Returnes the cache attributes used in Define Extend (DE).
3651  */
3652 static int
3653 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
3654 {
3655         struct dasd_eckd_private *private =
3656                 (struct dasd_eckd_private *)device->private;
3657         struct attrib_data_t attrib = private->attrib;
3658         int rc;
3659
3660         if (!capable(CAP_SYS_ADMIN))
3661                 return -EACCES;
3662         if (!argp)
3663                 return -EINVAL;
3664
3665         rc = 0;
3666         if (copy_to_user(argp, (long *) &attrib,
3667                          sizeof(struct attrib_data_t)))
3668                 rc = -EFAULT;
3669
3670         return rc;
3671 }
3672
3673 /*
3674  * Set attributes (cache operations)
3675  * Stores the attributes for cache operation to be used in Define Extend (DE).
3676  */
3677 static int
3678 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
3679 {
3680         struct dasd_eckd_private *private =
3681                 (struct dasd_eckd_private *)device->private;
3682         struct attrib_data_t attrib;
3683
3684         if (!capable(CAP_SYS_ADMIN))
3685                 return -EACCES;
3686         if (!argp)
3687                 return -EINVAL;
3688
3689         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
3690                 return -EFAULT;
3691         private->attrib = attrib;
3692
3693         dev_info(&device->cdev->dev,
3694                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
3695                  private->attrib.operation, private->attrib.nr_cyl);
3696         return 0;
3697 }
3698
3699 /*
3700  * Issue syscall I/O to EMC Symmetrix array.
3701  * CCWs are PSF and RSSD
3702  */
3703 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
3704 {
3705         struct dasd_symmio_parms usrparm;
3706         char *psf_data, *rssd_result;
3707         struct dasd_ccw_req *cqr;
3708         struct ccw1 *ccw;
3709         char psf0, psf1;
3710         int rc;
3711
3712         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
3713                 return -EACCES;
3714         psf0 = psf1 = 0;
3715
3716         /* Copy parms from caller */
3717         rc = -EFAULT;
3718         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3719                 goto out;
3720         if (is_compat_task() || sizeof(long) == 4) {
3721                 /* Make sure pointers are sane even on 31 bit. */
3722                 rc = -EINVAL;
3723                 if ((usrparm.psf_data >> 32) != 0)
3724                         goto out;
3725                 if ((usrparm.rssd_result >> 32) != 0)
3726                         goto out;
3727                 usrparm.psf_data &= 0x7fffffffULL;
3728                 usrparm.rssd_result &= 0x7fffffffULL;
3729         }
3730         /* alloc I/O data area */
3731         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
3732         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
3733         if (!psf_data || !rssd_result) {
3734                 rc = -ENOMEM;
3735                 goto out_free;
3736         }
3737
3738         /* get syscall header from user space */
3739         rc = -EFAULT;
3740         if (copy_from_user(psf_data,
3741                            (void __user *)(unsigned long) usrparm.psf_data,
3742                            usrparm.psf_data_len))
3743                 goto out_free;
3744         psf0 = psf_data[0];
3745         psf1 = psf_data[1];
3746
3747         /* setup CCWs for PSF + RSSD */
3748         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
3749         if (IS_ERR(cqr)) {
3750                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3751                         "Could not allocate initialization request");
3752                 rc = PTR_ERR(cqr);
3753                 goto out_free;
3754         }
3755
3756         cqr->startdev = device;
3757         cqr->memdev = device;
3758         cqr->retries = 3;
3759         cqr->expires = 10 * HZ;
3760         cqr->buildclk = get_clock();
3761         cqr->status = DASD_CQR_FILLED;
3762
3763         /* Build the ccws */
3764         ccw = cqr->cpaddr;
3765
3766         /* PSF ccw */
3767         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3768         ccw->count = usrparm.psf_data_len;
3769         ccw->flags |= CCW_FLAG_CC;
3770         ccw->cda = (__u32)(addr_t) psf_data;
3771
3772         ccw++;
3773
3774         /* RSSD ccw  */
3775         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3776         ccw->count = usrparm.rssd_result_len;
3777         ccw->flags = CCW_FLAG_SLI ;
3778         ccw->cda = (__u32)(addr_t) rssd_result;
3779
3780         rc = dasd_sleep_on(cqr);
3781         if (rc)
3782                 goto out_sfree;
3783
3784         rc = -EFAULT;
3785         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
3786                            rssd_result, usrparm.rssd_result_len))
3787                 goto out_sfree;
3788         rc = 0;
3789
3790 out_sfree:
3791         dasd_sfree_request(cqr, cqr->memdev);
3792 out_free:
3793         kfree(rssd_result);
3794         kfree(psf_data);
3795 out:
3796         DBF_DEV_EVENT(DBF_WARNING, device,
3797                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
3798                       (int) psf0, (int) psf1, rc);
3799         return rc;
3800 }
3801
3802 static int
3803 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
3804 {
3805         struct dasd_device *device = block->base;
3806
3807         switch (cmd) {
3808         case BIODASDGATTR:
3809                 return dasd_eckd_get_attrib(device, argp);
3810         case BIODASDSATTR:
3811                 return dasd_eckd_set_attrib(device, argp);
3812         case BIODASDPSRD:
3813                 return dasd_eckd_performance(device, argp);
3814         case BIODASDRLSE:
3815                 return dasd_eckd_release(device);
3816         case BIODASDRSRV:
3817                 return dasd_eckd_reserve(device);
3818         case BIODASDSLCK:
3819                 return dasd_eckd_steal_lock(device);
3820         case BIODASDSNID:
3821                 return dasd_eckd_snid(device, argp);
3822         case BIODASDSYMMIO:
3823                 return dasd_symm_io(device, argp);
3824         default:
3825                 return -ENOTTY;
3826         }
3827 }
3828
3829 /*
3830  * Dump the range of CCWs into 'page' buffer
3831  * and return number of printed chars.
3832  */
3833 static int
3834 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
3835 {
3836         int len, count;
3837         char *datap;
3838
3839         len = 0;
3840         while (from <= to) {
3841                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3842                                " CCW %p: %08X %08X DAT:",
3843                                from, ((int *) from)[0], ((int *) from)[1]);
3844
3845                 /* get pointer to data (consider IDALs) */
3846                 if (from->flags & CCW_FLAG_IDA)
3847                         datap = (char *) *((addr_t *) (addr_t) from->cda);
3848                 else
3849                         datap = (char *) ((addr_t) from->cda);
3850
3851                 /* dump data (max 32 bytes) */
3852                 for (count = 0; count < from->count && count < 32; count++) {
3853                         if (count % 8 == 0) len += sprintf(page + len, " ");
3854                         if (count % 4 == 0) len += sprintf(page + len, " ");
3855                         len += sprintf(page + len, "%02x", datap[count]);
3856                 }
3857                 len += sprintf(page + len, "\n");
3858                 from++;
3859         }
3860         return len;
3861 }
3862
3863 static void
3864 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
3865                          char *reason)
3866 {
3867         u64 *sense;
3868         u64 *stat;
3869
3870         sense = (u64 *) dasd_get_sense(irb);
3871         stat = (u64 *) &irb->scsw;
3872         if (sense) {
3873                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
3874                               "%016llx %016llx %016llx %016llx",
3875                               reason, *stat, *((u32 *) (stat + 1)),
3876                               sense[0], sense[1], sense[2], sense[3]);
3877         } else {
3878                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
3879                               reason, *stat, *((u32 *) (stat + 1)),
3880                               "NO VALID SENSE");
3881         }
3882 }
3883
3884 /*
3885  * Print sense data and related channel program.
3886  * Parts are printed because printk buffer is only 1024 bytes.
3887  */
3888 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
3889                                  struct dasd_ccw_req *req, struct irb *irb)
3890 {
3891         char *page;
3892         struct ccw1 *first, *last, *fail, *from, *to;
3893         int len, sl, sct;
3894
3895         page = (char *) get_zeroed_page(GFP_ATOMIC);
3896         if (page == NULL) {
3897                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3898                               "No memory to dump sense data\n");
3899                 return;
3900         }
3901         /* dump the sense data */
3902         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3903                       " I/O status report for device %s:\n",
3904                       dev_name(&device->cdev->dev));
3905         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3906                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
3907                        "CS:%02X RC:%d\n",
3908                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
3909                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
3910                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
3911                        req ? req->intrc : 0);
3912         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3913                        " device %s: Failing CCW: %p\n",
3914                        dev_name(&device->cdev->dev),
3915                        (void *) (addr_t) irb->scsw.cmd.cpa);
3916         if (irb->esw.esw0.erw.cons) {
3917                 for (sl = 0; sl < 4; sl++) {
3918                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3919                                        " Sense(hex) %2d-%2d:",
3920                                        (8 * sl), ((8 * sl) + 7));
3921
3922                         for (sct = 0; sct < 8; sct++) {
3923                                 len += sprintf(page + len, " %02x",
3924                                                irb->ecw[8 * sl + sct]);
3925                         }
3926                         len += sprintf(page + len, "\n");
3927                 }
3928
3929                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
3930                         /* 24 Byte Sense Data */
3931                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3932                                 " 24 Byte: %x MSG %x, "
3933                                 "%s MSGb to SYSOP\n",
3934                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
3935                                 irb->ecw[1] & 0x10 ? "" : "no");
3936                 } else {
3937                         /* 32 Byte Sense Data */
3938                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3939                                 " 32 Byte: Format: %x "
3940                                 "Exception class %x\n",
3941                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
3942                 }
3943         } else {
3944                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3945                         " SORRY - NO VALID SENSE AVAILABLE\n");
3946         }
3947         printk("%s", page);
3948
3949         if (req) {
3950                 /* req == NULL for unsolicited interrupts */
3951                 /* dump the Channel Program (max 140 Bytes per line) */
3952                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
3953                 first = req->cpaddr;
3954                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
3955                 to = min(first + 6, last);
3956                 len = sprintf(page,  KERN_ERR PRINTK_HEADER
3957                               " Related CP in req: %p\n", req);
3958                 dasd_eckd_dump_ccw_range(first, to, page + len);
3959                 printk("%s", page);
3960
3961                 /* print failing CCW area (maximum 4) */
3962                 /* scsw->cda is either valid or zero  */
3963                 len = 0;
3964                 from = ++to;
3965                 fail = (struct ccw1 *)(addr_t)
3966                                 irb->scsw.cmd.cpa; /* failing CCW */
3967                 if (from <  fail - 2) {
3968                         from = fail - 2;     /* there is a gap - print header */
3969                         len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
3970                 }
3971                 to = min(fail + 1, last);
3972                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
3973
3974                 /* print last CCWs (maximum 2) */
3975                 from = max(from, ++to);
3976                 if (from < last - 1) {
3977                         from = last - 1;     /* there is a gap - print header */
3978                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
3979                 }
3980                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
3981                 if (len > 0)
3982                         printk("%s", page);
3983         }
3984         free_page((unsigned long) page);
3985 }
3986
3987
3988 /*
3989  * Print sense data from a tcw.
3990  */
3991 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
3992                                  struct dasd_ccw_req *req, struct irb *irb)
3993 {
3994         char *page;
3995         int len, sl, sct, residual;
3996         struct tsb *tsb;
3997         u8 *sense, *rcq;
3998
3999         page = (char *) get_zeroed_page(GFP_ATOMIC);
4000         if (page == NULL) {
4001                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4002                             "No memory to dump sense data");
4003                 return;
4004         }
4005         /* dump the sense data */
4006         len = sprintf(page,  KERN_ERR PRINTK_HEADER
4007                       " I/O status report for device %s:\n",
4008                       dev_name(&device->cdev->dev));
4009         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4010                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4011                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4012                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4013                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4014                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4015                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
4016                        req ? req->intrc : 0);
4017         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4018                        " device %s: Failing TCW: %p\n",
4019                        dev_name(&device->cdev->dev),
4020                        (void *) (addr_t) irb->scsw.tm.tcw);
4021
4022         tsb = NULL;
4023         sense = NULL;
4024         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4025                 tsb = tcw_get_tsb(
4026                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4027
4028         if (tsb) {
4029                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4030                                " tsb->length %d\n", tsb->length);
4031                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4032                                " tsb->flags %x\n", tsb->flags);
4033                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4034                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
4035                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4036                                " tsb->count %d\n", tsb->count);
4037                 residual = tsb->count - 28;
4038                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4039                                " residual %d\n", residual);
4040
4041                 switch (tsb->flags & 0x07) {
4042                 case 1: /* tsa_iostat */
4043                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4044                                " tsb->tsa.iostat.dev_time %d\n",
4045                                        tsb->tsa.iostat.dev_time);
4046                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4047                                " tsb->tsa.iostat.def_time %d\n",
4048                                        tsb->tsa.iostat.def_time);
4049                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4050                                " tsb->tsa.iostat.queue_time %d\n",
4051                                        tsb->tsa.iostat.queue_time);
4052                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4053                                " tsb->tsa.iostat.dev_busy_time %d\n",
4054                                        tsb->tsa.iostat.dev_busy_time);
4055                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4056                                " tsb->tsa.iostat.dev_act_time %d\n",
4057                                        tsb->tsa.iostat.dev_act_time);
4058                         sense = tsb->tsa.iostat.sense;
4059                         break;
4060                 case 2: /* ts_ddpc */
4061                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4062                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4063                         for (sl = 0; sl < 2; sl++) {
4064                                 len += sprintf(page + len,
4065                                                KERN_ERR PRINTK_HEADER
4066                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
4067                                                (8 * sl), ((8 * sl) + 7));
4068                                 rcq = tsb->tsa.ddpc.rcq;
4069                                 for (sct = 0; sct < 8; sct++) {
4070                                         len += sprintf(page + len, " %02x",
4071                                                        rcq[8 * sl + sct]);
4072                                 }
4073                                 len += sprintf(page + len, "\n");
4074                         }
4075                         sense = tsb->tsa.ddpc.sense;
4076                         break;
4077                 case 3: /* tsa_intrg */
4078                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4079                                       " tsb->tsa.intrg.: not supportet yet \n");
4080                         break;
4081                 }
4082
4083                 if (sense) {
4084                         for (sl = 0; sl < 4; sl++) {
4085                                 len += sprintf(page + len,
4086                                                KERN_ERR PRINTK_HEADER
4087                                                " Sense(hex) %2d-%2d:",
4088                                                (8 * sl), ((8 * sl) + 7));
4089                                 for (sct = 0; sct < 8; sct++) {
4090                                         len += sprintf(page + len, " %02x",
4091                                                        sense[8 * sl + sct]);
4092                                 }
4093                                 len += sprintf(page + len, "\n");
4094                         }
4095
4096                         if (sense[27] & DASD_SENSE_BIT_0) {
4097                                 /* 24 Byte Sense Data */
4098                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
4099                                         " 24 Byte: %x MSG %x, "
4100                                         "%s MSGb to SYSOP\n",
4101                                         sense[7] >> 4, sense[7] & 0x0f,
4102                                         sense[1] & 0x10 ? "" : "no");
4103                         } else {
4104                                 /* 32 Byte Sense Data */
4105                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
4106                                         " 32 Byte: Format: %x "
4107                                         "Exception class %x\n",
4108                                         sense[6] & 0x0f, sense[22] >> 4);
4109                         }
4110                 } else {
4111                         sprintf(page + len, KERN_ERR PRINTK_HEADER
4112                                 " SORRY - NO VALID SENSE AVAILABLE\n");
4113                 }
4114         } else {
4115                 sprintf(page + len, KERN_ERR PRINTK_HEADER
4116                         " SORRY - NO TSB DATA AVAILABLE\n");
4117         }
4118         printk("%s", page);
4119         free_page((unsigned long) page);
4120 }
4121
4122 static void dasd_eckd_dump_sense(struct dasd_device *device,
4123                                  struct dasd_ccw_req *req, struct irb *irb)
4124 {
4125         if (scsw_is_tm(&irb->scsw))
4126                 dasd_eckd_dump_sense_tcw(device, req, irb);
4127         else
4128                 dasd_eckd_dump_sense_ccw(device, req, irb);
4129 }
4130
4131 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4132 {
4133         /*
4134          * the device should be disconnected from our LCU structure
4135          * on restore we will reconnect it and reread LCU specific
4136          * information like PAV support that might have changed
4137          */
4138         dasd_alias_remove_device(device);
4139         dasd_alias_disconnect_device_from_lcu(device);
4140
4141         return 0;
4142 }
4143
4144 static int dasd_eckd_restore_device(struct dasd_device *device)
4145 {
4146         struct dasd_eckd_private *private;
4147         struct dasd_eckd_characteristics temp_rdc_data;
4148         int rc;
4149         struct dasd_uid temp_uid;
4150         unsigned long flags;
4151
4152         private = (struct dasd_eckd_private *) device->private;
4153
4154         /* Read Configuration Data */
4155         rc = dasd_eckd_read_conf(device);
4156         if (rc)
4157                 goto out_err;
4158
4159         dasd_eckd_get_uid(device, &temp_uid);
4160         /* Generate device unique id */
4161         rc = dasd_eckd_generate_uid(device);
4162         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4163         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4164                 dev_err(&device->cdev->dev, "The UID of the DASD has "
4165                         "changed\n");
4166         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4167         if (rc)
4168                 goto out_err;
4169
4170         /* register lcu with alias handling, enable PAV if this is a new lcu */
4171         rc = dasd_alias_make_device_known_to_lcu(device);
4172         if (rc)
4173                 return rc;
4174         dasd_eckd_validate_server(device, DASD_CQR_FLAGS_FAILFAST);
4175
4176         /* RE-Read Configuration Data */
4177         rc = dasd_eckd_read_conf(device);
4178         if (rc)
4179                 goto out_err;
4180
4181         /* Read Feature Codes */
4182         dasd_eckd_read_features(device);
4183
4184         /* Read Device Characteristics */
4185         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4186                                          &temp_rdc_data, 64);
4187         if (rc) {
4188                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4189                                 "Read device characteristic failed, rc=%d", rc);
4190                 goto out_err;
4191         }
4192         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4193         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4194         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4195
4196         /* add device to alias management */
4197         dasd_alias_add_device(device);
4198
4199         return 0;
4200
4201 out_err:
4202         return -1;
4203 }
4204
4205 static int dasd_eckd_reload_device(struct dasd_device *device)
4206 {
4207         struct dasd_eckd_private *private;
4208         int rc, old_base;
4209         char print_uid[60];
4210         struct dasd_uid uid;
4211         unsigned long flags;
4212
4213         private = (struct dasd_eckd_private *) device->private;
4214
4215         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4216         old_base = private->uid.base_unit_addr;
4217         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4218
4219         /* Read Configuration Data */
4220         rc = dasd_eckd_read_conf(device);
4221         if (rc)
4222                 goto out_err;
4223
4224         rc = dasd_eckd_generate_uid(device);
4225         if (rc)
4226                 goto out_err;
4227         /*
4228          * update unit address configuration and
4229          * add device to alias management
4230          */
4231         dasd_alias_update_add_device(device);
4232
4233         dasd_eckd_get_uid(device, &uid);
4234
4235         if (old_base != uid.base_unit_addr) {
4236                 if (strlen(uid.vduit) > 0)
4237                         snprintf(print_uid, sizeof(print_uid),
4238                                  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
4239                                  uid.ssid, uid.base_unit_addr, uid.vduit);
4240                 else
4241                         snprintf(print_uid, sizeof(print_uid),
4242                                  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
4243                                  uid.ssid, uid.base_unit_addr);
4244
4245                 dev_info(&device->cdev->dev,
4246                          "An Alias device was reassigned to a new base device "
4247                          "with UID: %s\n", print_uid);
4248         }
4249         return 0;
4250
4251 out_err:
4252         return -1;
4253 }
4254
4255 static struct ccw_driver dasd_eckd_driver = {
4256         .driver = {
4257                 .name   = "dasd-eckd",
4258                 .owner  = THIS_MODULE,
4259         },
4260         .ids         = dasd_eckd_ids,
4261         .probe       = dasd_eckd_probe,
4262         .remove      = dasd_generic_remove,
4263         .set_offline = dasd_generic_set_offline,
4264         .set_online  = dasd_eckd_set_online,
4265         .notify      = dasd_generic_notify,
4266         .path_event  = dasd_generic_path_event,
4267         .shutdown    = dasd_generic_shutdown,
4268         .freeze      = dasd_generic_pm_freeze,
4269         .thaw        = dasd_generic_restore_device,
4270         .restore     = dasd_generic_restore_device,
4271         .uc_handler  = dasd_generic_uc_handler,
4272         .int_class   = IOINT_DAS,
4273 };
4274
4275 /*
4276  * max_blocks is dependent on the amount of storage that is available
4277  * in the static io buffer for each device. Currently each device has
4278  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
4279  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
4280  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
4281  * addition we have one define extent ccw + 16 bytes of data and one
4282  * locate record ccw + 16 bytes of data. That makes:
4283  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
4284  * We want to fit two into the available memory so that we can immediately
4285  * start the next request if one finishes off. That makes 249.5 blocks
4286  * for one request. Give a little safety and the result is 240.
4287  */
4288 static struct dasd_discipline dasd_eckd_discipline = {
4289         .owner = THIS_MODULE,
4290         .name = "ECKD",
4291         .ebcname = "ECKD",
4292         .max_blocks = 190,
4293         .check_device = dasd_eckd_check_characteristics,
4294         .uncheck_device = dasd_eckd_uncheck_device,
4295         .do_analysis = dasd_eckd_do_analysis,
4296         .verify_path = dasd_eckd_verify_path,
4297         .ready_to_online = dasd_eckd_ready_to_online,
4298         .online_to_ready = dasd_eckd_online_to_ready,
4299         .fill_geometry = dasd_eckd_fill_geometry,
4300         .start_IO = dasd_start_IO,
4301         .term_IO = dasd_term_IO,
4302         .handle_terminated_request = dasd_eckd_handle_terminated_request,
4303         .format_device = dasd_eckd_format_device,
4304         .erp_action = dasd_eckd_erp_action,
4305         .erp_postaction = dasd_eckd_erp_postaction,
4306         .check_for_device_change = dasd_eckd_check_for_device_change,
4307         .build_cp = dasd_eckd_build_alias_cp,
4308         .free_cp = dasd_eckd_free_alias_cp,
4309         .dump_sense = dasd_eckd_dump_sense,
4310         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
4311         .fill_info = dasd_eckd_fill_info,
4312         .ioctl = dasd_eckd_ioctl,
4313         .freeze = dasd_eckd_pm_freeze,
4314         .restore = dasd_eckd_restore_device,
4315         .reload = dasd_eckd_reload_device,
4316         .get_uid = dasd_eckd_get_uid,
4317         .kick_validate = dasd_eckd_kick_validate_server,
4318 };
4319
4320 static int __init
4321 dasd_eckd_init(void)
4322 {
4323         int ret;
4324
4325         ASCEBC(dasd_eckd_discipline.ebcname, 4);
4326         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
4327                                    GFP_KERNEL | GFP_DMA);
4328         if (!dasd_reserve_req)
4329                 return -ENOMEM;
4330         path_verification_worker = kmalloc(sizeof(*path_verification_worker),
4331                                    GFP_KERNEL | GFP_DMA);
4332         if (!path_verification_worker) {
4333                 kfree(dasd_reserve_req);
4334                 return -ENOMEM;
4335         }
4336         ret = ccw_driver_register(&dasd_eckd_driver);
4337         if (!ret)
4338                 wait_for_device_probe();
4339         else {
4340                 kfree(path_verification_worker);
4341                 kfree(dasd_reserve_req);
4342         }
4343         return ret;
4344 }
4345
4346 static void __exit
4347 dasd_eckd_cleanup(void)
4348 {
4349         ccw_driver_unregister(&dasd_eckd_driver);
4350         kfree(path_verification_worker);
4351         kfree(dasd_reserve_req);
4352 }
4353
4354 module_init(dasd_eckd_init);
4355 module_exit(dasd_eckd_cleanup);