drivers/s390/block/dasd_eckd.c

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_eckd.c
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5  *                  Carsten Otte <Cotte@de.ibm.com>
   6  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  * Bugreports.to..: <Linux390@de.ibm.com>
   8  * Copyright IBM Corp. 1999, 2009
   9  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
  10  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
  11  */
  12
  13 #define KMSG_COMPONENT "dasd-eckd"
  14
  15 #include <linux/stddef.h>
  16 #include <linux/kernel.h>
  17 #include <linux/slab.h>
  18 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  19 #include <linux/bio.h>
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22
  23 #include <asm/debug.h>
  24 #include <asm/idals.h>
  25 #include <asm/ebcdic.h>
  26 #include <asm/compat.h>
  27 #include <asm/io.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/cio.h>
  30 #include <asm/ccwdev.h>
  31 #include <asm/itcw.h>
  32
  33 #include "dasd_int.h"
  34 #include "dasd_eckd.h"
  35 #include "../cio/chsc.h"
  36
  37
  38 #ifdef PRINTK_HEADER
  39 #undef PRINTK_HEADER
  40 #endif                          /* PRINTK_HEADER */
  41 #define PRINTK_HEADER "dasd(eckd):"
  42
  43 #define ECKD_C0(i) (i->home_bytes)
  44 #define ECKD_F(i) (i->formula)
  45 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
  46                     (i->factors.f_0x02.f1))
  47 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
  48                     (i->factors.f_0x02.f2))
  49 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
  50                     (i->factors.f_0x02.f3))
  51 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
  52 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
  53 #define ECKD_F6(i) (i->factor6)
  54 #define ECKD_F7(i) (i->factor7)
  55 #define ECKD_F8(i) (i->factor8)
  56
  57 /*
  58  * raw track access always map to 64k in memory
  59  * so it maps to 16 blocks of 4k per track
  60  */
  61 #define DASD_RAW_BLOCK_PER_TRACK 16
  62 #define DASD_RAW_BLOCKSIZE 4096
  63 /* 64k are 128 x 512 byte sectors  */
  64 #define DASD_RAW_SECTORS_PER_TRACK 128
  65
  66 MODULE_LICENSE("GPL");
  67
  68 static struct dasd_discipline dasd_eckd_discipline;
  69
  70 /* The ccw bus type uses this table to find devices that it sends to
  71  * dasd_eckd_probe */
  72 static struct ccw_device_id dasd_eckd_ids[] = {
  73         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
  74         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
  75         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
  76         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
  77         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
  78         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
  79         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
  80         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
  81         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
  82         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
  83         { /* end of list */ },
  84 };
  85
  86 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  87
  88 static struct ccw_driver dasd_eckd_driver; /* see below */
  89
  90 #define INIT_CQR_OK 0
  91 #define INIT_CQR_UNFORMATTED 1
  92 #define INIT_CQR_ERROR 2
  93
  94 /* emergency request for reserve/release */
  95 static struct {
  96         struct dasd_ccw_req cqr;
  97         struct ccw1 ccw;
  98         char data[32];
  99 } *dasd_reserve_req;
 100 static DEFINE_MUTEX(dasd_reserve_mutex);
 101
 102 /* definitions for the path verification worker */
 103 struct path_verification_work_data {
 104         struct work_struct worker;
 105         struct dasd_device *device;
 106         struct dasd_ccw_req cqr;
 107         struct ccw1 ccw;
 108         __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
 109         int isglobal;
 110         __u8 tbvpm;
 111 };
 112 static struct path_verification_work_data *path_verification_worker;
 113 static DEFINE_MUTEX(dasd_path_verification_mutex);
 114
 115 /* initial attempt at a probe function. this can be simplified once
 116  * the other detection code is gone */
 117 static int
 118 dasd_eckd_probe (struct ccw_device *cdev)
 119 {
 120         int ret;
 121
 122         /* set ECKD specific ccw-device options */
 123         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
 124                                      CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
 125         if (ret) {
 126                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
 127                                 "dasd_eckd_probe: could not set "
 128                                 "ccw-device options");
 129                 return ret;
 130         }
 131         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
 132         return ret;
 133 }
 134
 135 static int
 136 dasd_eckd_set_online(struct ccw_device *cdev)
 137 {
 138         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
 139 }
 140
 141 static const int sizes_trk0[] = { 28, 148, 84 };
 142 #define LABEL_SIZE 140
 143
 144 static inline unsigned int
 145 round_up_multiple(unsigned int no, unsigned int mult)
 146 {
 147         int rem = no % mult;
 148         return (rem ? no - rem + mult : no);
 149 }
 150
 151 static inline unsigned int
 152 ceil_quot(unsigned int d1, unsigned int d2)
 153 {
 154         return (d1 + (d2 - 1)) / d2;
 155 }
 156
 157 static unsigned int
 158 recs_per_track(struct dasd_eckd_characteristics * rdc,
 159                unsigned int kl, unsigned int dl)
 160 {
 161         int dn, kn;
 162
 163         switch (rdc->dev_type) {
 164         case 0x3380:
 165                 if (kl)
 166                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 167                                        ceil_quot(dl + 12, 32));
 168                 else
 169                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 170         case 0x3390:
 171                 dn = ceil_quot(dl + 6, 232) + 1;
 172                 if (kl) {
 173                         kn = ceil_quot(kl + 6, 232) + 1;
 174                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 175                                        9 + ceil_quot(dl + 6 * dn, 34));
 176                 } else
 177                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 178         case 0x9345:
 179                 dn = ceil_quot(dl + 6, 232) + 1;
 180                 if (kl) {
 181                         kn = ceil_quot(kl + 6, 232) + 1;
 182                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 183                                        ceil_quot(dl + 6 * dn, 34));
 184                 } else
 185                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 186         }
 187         return 0;
 188 }
 189
 190 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
 191 {
 192         geo->cyl = (__u16) cyl;
 193         geo->head = cyl >> 16;
 194         geo->head <<= 4;
 195         geo->head |= head;
 196 }
 197
 198 static int
 199 check_XRC (struct ccw1         *de_ccw,
 200            struct DE_eckd_data *data,
 201            struct dasd_device  *device)
 202 {
 203         struct dasd_eckd_private *private;
 204         int rc;
 205
 206         private = (struct dasd_eckd_private *) device->private;
 207         if (!private->rdc_data.facilities.XRC_supported)
 208                 return 0;
 209
 210         /* switch on System Time Stamp - needed for XRC Support */
 211         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 212         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 213
 214         rc = get_sync_clock(&data->ep_sys_time);
 215         /* Ignore return code if sync clock is switched off. */
 216         if (rc == -ENOSYS || rc == -EACCES)
 217                 rc = 0;
 218
 219         de_ccw->count = sizeof(struct DE_eckd_data);
 220         de_ccw->flags |= CCW_FLAG_SLI;
 221         return rc;
 222 }
 223
 224 static int
 225 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
 226               unsigned int totrk, int cmd, struct dasd_device *device)
 227 {
 228         struct dasd_eckd_private *private;
 229         u32 begcyl, endcyl;
 230         u16 heads, beghead, endhead;
 231         int rc = 0;
 232
 233         private = (struct dasd_eckd_private *) device->private;
 234
 235         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 236         ccw->flags = 0;
 237         ccw->count = 16;
 238         ccw->cda = (__u32) __pa(data);
 239
 240         memset(data, 0, sizeof(struct DE_eckd_data));
 241         switch (cmd) {
 242         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 243         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 244         case DASD_ECKD_CCW_READ:
 245         case DASD_ECKD_CCW_READ_MT:
 246         case DASD_ECKD_CCW_READ_CKD:
 247         case DASD_ECKD_CCW_READ_CKD_MT:
 248         case DASD_ECKD_CCW_READ_KD:
 249         case DASD_ECKD_CCW_READ_KD_MT:
 250         case DASD_ECKD_CCW_READ_COUNT:
 251                 data->mask.perm = 0x1;
 252                 data->attributes.operation = private->attrib.operation;
 253                 break;
 254         case DASD_ECKD_CCW_WRITE:
 255         case DASD_ECKD_CCW_WRITE_MT:
 256         case DASD_ECKD_CCW_WRITE_KD:
 257         case DASD_ECKD_CCW_WRITE_KD_MT:
 258                 data->mask.perm = 0x02;
 259                 data->attributes.operation = private->attrib.operation;
 260                 rc = check_XRC (ccw, data, device);
 261                 break;
 262         case DASD_ECKD_CCW_WRITE_CKD:
 263         case DASD_ECKD_CCW_WRITE_CKD_MT:
 264                 data->attributes.operation = DASD_BYPASS_CACHE;
 265                 rc = check_XRC (ccw, data, device);
 266                 break;
 267         case DASD_ECKD_CCW_ERASE:
 268         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 269         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 270                 data->mask.perm = 0x3;
 271                 data->mask.auth = 0x1;
 272                 data->attributes.operation = DASD_BYPASS_CACHE;
 273                 rc = check_XRC (ccw, data, device);
 274                 break;
 275         default:
 276                 dev_err(&device->cdev->dev,
 277                         "0x%x is not a known command\n", cmd);
 278                 break;
 279         }
 280
 281         data->attributes.mode = 0x3;    /* ECKD */
 282
 283         if ((private->rdc_data.cu_type == 0x2105 ||
 284              private->rdc_data.cu_type == 0x2107 ||
 285              private->rdc_data.cu_type == 0x1750)
 286             && !(private->uses_cdl && trk < 2))
 287                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 288
 289         heads = private->rdc_data.trk_per_cyl;
 290         begcyl = trk / heads;
 291         beghead = trk % heads;
 292         endcyl = totrk / heads;
 293         endhead = totrk % heads;
 294
 295         /* check for sequential prestage - enhance cylinder range */
 296         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 297             data->attributes.operation == DASD_SEQ_ACCESS) {
 298
 299                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
 300                         endcyl += private->attrib.nr_cyl;
 301                 else
 302                         endcyl = (private->real_cyl - 1);
 303         }
 304
 305         set_ch_t(&data->beg_ext, begcyl, beghead);
 306         set_ch_t(&data->end_ext, endcyl, endhead);
 307         return rc;
 308 }
 309
 310 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
 311                                struct dasd_device  *device)
 312 {
 313         struct dasd_eckd_private *private;
 314         int rc;
 315
 316         private = (struct dasd_eckd_private *) device->private;
 317         if (!private->rdc_data.facilities.XRC_supported)
 318                 return 0;
 319
 320         /* switch on System Time Stamp - needed for XRC Support */
 321         pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid'   */
 322         pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
 323         pfxdata->validity.time_stamp = 1;           /* 'Time Stamp Valid'   */
 324
 325         rc = get_sync_clock(&pfxdata->define_extent.ep_sys_time);
 326         /* Ignore return code if sync clock is switched off. */
 327         if (rc == -ENOSYS || rc == -EACCES)
 328                 rc = 0;
 329         return rc;
 330 }
 331
 332 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
 333                           unsigned int rec_on_trk, int count, int cmd,
 334                           struct dasd_device *device, unsigned int reclen,
 335                           unsigned int tlf)
 336 {
 337         struct dasd_eckd_private *private;
 338         int sector;
 339         int dn, d;
 340
 341         private = (struct dasd_eckd_private *) device->private;
 342
 343         memset(data, 0, sizeof(*data));
 344         sector = 0;
 345         if (rec_on_trk) {
 346                 switch (private->rdc_data.dev_type) {
 347                 case 0x3390:
 348                         dn = ceil_quot(reclen + 6, 232);
 349                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 350                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 351                         break;
 352                 case 0x3380:
 353                         d = 7 + ceil_quot(reclen + 12, 32);
 354                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 355                         break;
 356                 }
 357         }
 358         data->sector = sector;
 359         /* note: meaning of count depends on the operation
 360          *       for record based I/O it's the number of records, but for
 361          *       track based I/O it's the number of tracks
 362          */
 363         data->count = count;
 364         switch (cmd) {
 365         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 366                 data->operation.orientation = 0x3;
 367                 data->operation.operation = 0x03;
 368                 break;
 369         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 370                 data->operation.orientation = 0x3;
 371                 data->operation.operation = 0x16;
 372                 break;
 373         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 374                 data->operation.orientation = 0x1;
 375                 data->operation.operation = 0x03;
 376                 data->count++;
 377                 break;
 378         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 379                 data->operation.orientation = 0x3;
 380                 data->operation.operation = 0x16;
 381                 data->count++;
 382                 break;
 383         case DASD_ECKD_CCW_WRITE:
 384         case DASD_ECKD_CCW_WRITE_MT:
 385         case DASD_ECKD_CCW_WRITE_KD:
 386         case DASD_ECKD_CCW_WRITE_KD_MT:
 387                 data->auxiliary.length_valid = 0x1;
 388                 data->length = reclen;
 389                 data->operation.operation = 0x01;
 390                 break;
 391         case DASD_ECKD_CCW_WRITE_CKD:
 392         case DASD_ECKD_CCW_WRITE_CKD_MT:
 393                 data->auxiliary.length_valid = 0x1;
 394                 data->length = reclen;
 395                 data->operation.operation = 0x03;
 396                 break;
 397         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 398                 data->operation.orientation = 0x0;
 399                 data->operation.operation = 0x3F;
 400                 data->extended_operation = 0x11;
 401                 data->length = 0;
 402                 data->extended_parameter_length = 0x02;
 403                 if (data->count > 8) {
 404                         data->extended_parameter[0] = 0xFF;
 405                         data->extended_parameter[1] = 0xFF;
 406                         data->extended_parameter[1] <<= (16 - count);
 407                 } else {
 408                         data->extended_parameter[0] = 0xFF;
 409                         data->extended_parameter[0] <<= (8 - count);
 410                         data->extended_parameter[1] = 0x00;
 411                 }
 412                 data->sector = 0xFF;
 413                 break;
 414         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 415                 data->auxiliary.length_valid = 0x1;
 416                 data->length = reclen;  /* not tlf, as one might think */
 417                 data->operation.operation = 0x3F;
 418                 data->extended_operation = 0x23;
 419                 break;
 420         case DASD_ECKD_CCW_READ:
 421         case DASD_ECKD_CCW_READ_MT:
 422         case DASD_ECKD_CCW_READ_KD:
 423         case DASD_ECKD_CCW_READ_KD_MT:
 424                 data->auxiliary.length_valid = 0x1;
 425                 data->length = reclen;
 426                 data->operation.operation = 0x06;
 427                 break;
 428         case DASD_ECKD_CCW_READ_CKD:
 429         case DASD_ECKD_CCW_READ_CKD_MT:
 430                 data->auxiliary.length_valid = 0x1;
 431                 data->length = reclen;
 432                 data->operation.operation = 0x16;
 433                 break;
 434         case DASD_ECKD_CCW_READ_COUNT:
 435                 data->operation.operation = 0x06;
 436                 break;
 437         case DASD_ECKD_CCW_READ_TRACK:
 438                 data->operation.orientation = 0x1;
 439                 data->operation.operation = 0x0C;
 440                 data->extended_parameter_length = 0;
 441                 data->sector = 0xFF;
 442                 break;
 443         case DASD_ECKD_CCW_READ_TRACK_DATA:
 444                 data->auxiliary.length_valid = 0x1;
 445                 data->length = tlf;
 446                 data->operation.operation = 0x0C;
 447                 break;
 448         case DASD_ECKD_CCW_ERASE:
 449                 data->length = reclen;
 450                 data->auxiliary.length_valid = 0x1;
 451                 data->operation.operation = 0x0b;
 452                 break;
 453         default:
 454                 DBF_DEV_EVENT(DBF_ERR, device,
 455                             "fill LRE unknown opcode 0x%x", cmd);
 456                 BUG();
 457         }
 458         set_ch_t(&data->seek_addr,
 459                  trk / private->rdc_data.trk_per_cyl,
 460                  trk % private->rdc_data.trk_per_cyl);
 461         data->search_arg.cyl = data->seek_addr.cyl;
 462         data->search_arg.head = data->seek_addr.head;
 463         data->search_arg.record = rec_on_trk;
 464 }
 465
 466 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 467                       unsigned int trk, unsigned int totrk, int cmd,
 468                       struct dasd_device *basedev, struct dasd_device *startdev,
 469                       unsigned char format, unsigned int rec_on_trk, int count,
 470                       unsigned int blksize, unsigned int tlf)
 471 {
 472         struct dasd_eckd_private *basepriv, *startpriv;
 473         struct DE_eckd_data *dedata;
 474         struct LRE_eckd_data *lredata;
 475         u32 begcyl, endcyl;
 476         u16 heads, beghead, endhead;
 477         int rc = 0;
 478
 479         basepriv = (struct dasd_eckd_private *) basedev->private;
 480         startpriv = (struct dasd_eckd_private *) startdev->private;
 481         dedata = &pfxdata->define_extent;
 482         lredata = &pfxdata->locate_record;
 483
 484         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 485         ccw->flags = 0;
 486         if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
 487                 ccw->count = sizeof(*pfxdata) + 2;
 488                 ccw->cda = (__u32) __pa(pfxdata);
 489                 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
 490         } else {
 491                 ccw->count = sizeof(*pfxdata);
 492                 ccw->cda = (__u32) __pa(pfxdata);
 493                 memset(pfxdata, 0, sizeof(*pfxdata));
 494         }
 495
 496         /* prefix data */
 497         if (format > 1) {
 498                 DBF_DEV_EVENT(DBF_ERR, basedev,
 499                               "PFX LRE unknown format 0x%x", format);
 500                 BUG();
 501                 return -EINVAL;
 502         }
 503         pfxdata->format = format;
 504         pfxdata->base_address = basepriv->ned->unit_addr;
 505         pfxdata->base_lss = basepriv->ned->ID;
 506         pfxdata->validity.define_extent = 1;
 507
 508         /* private uid is kept up to date, conf_data may be outdated */
 509         if (startpriv->uid.type != UA_BASE_DEVICE) {
 510                 pfxdata->validity.verify_base = 1;
 511                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
 512                         pfxdata->validity.hyper_pav = 1;
 513         }
 514
 515         /* define extend data (mostly)*/
 516         switch (cmd) {
 517         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 518         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 519         case DASD_ECKD_CCW_READ:
 520         case DASD_ECKD_CCW_READ_MT:
 521         case DASD_ECKD_CCW_READ_CKD:
 522         case DASD_ECKD_CCW_READ_CKD_MT:
 523         case DASD_ECKD_CCW_READ_KD:
 524         case DASD_ECKD_CCW_READ_KD_MT:
 525         case DASD_ECKD_CCW_READ_COUNT:
 526                 dedata->mask.perm = 0x1;
 527                 dedata->attributes.operation = basepriv->attrib.operation;
 528                 break;
 529         case DASD_ECKD_CCW_READ_TRACK:
 530         case DASD_ECKD_CCW_READ_TRACK_DATA:
 531                 dedata->mask.perm = 0x1;
 532                 dedata->attributes.operation = basepriv->attrib.operation;
 533                 dedata->blk_size = 0;
 534                 break;
 535         case DASD_ECKD_CCW_WRITE:
 536         case DASD_ECKD_CCW_WRITE_MT:
 537         case DASD_ECKD_CCW_WRITE_KD:
 538         case DASD_ECKD_CCW_WRITE_KD_MT:
 539                 dedata->mask.perm = 0x02;
 540                 dedata->attributes.operation = basepriv->attrib.operation;
 541                 rc = check_XRC_on_prefix(pfxdata, basedev);
 542                 break;
 543         case DASD_ECKD_CCW_WRITE_CKD:
 544         case DASD_ECKD_CCW_WRITE_CKD_MT:
 545                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 546                 rc = check_XRC_on_prefix(pfxdata, basedev);
 547                 break;
 548         case DASD_ECKD_CCW_ERASE:
 549         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 550         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 551                 dedata->mask.perm = 0x3;
 552                 dedata->mask.auth = 0x1;
 553                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 554                 rc = check_XRC_on_prefix(pfxdata, basedev);
 555                 break;
 556         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 557                 dedata->mask.perm = 0x03;
 558                 dedata->attributes.operation = basepriv->attrib.operation;
 559                 dedata->blk_size = 0;
 560                 break;
 561         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 562                 dedata->mask.perm = 0x02;
 563                 dedata->attributes.operation = basepriv->attrib.operation;
 564                 dedata->blk_size = blksize;
 565                 rc = check_XRC_on_prefix(pfxdata, basedev);
 566                 break;
 567         default:
 568                 DBF_DEV_EVENT(DBF_ERR, basedev,
 569                             "PFX LRE unknown opcode 0x%x", cmd);
 570                 BUG();
 571                 return -EINVAL;
 572         }
 573
 574         dedata->attributes.mode = 0x3;  /* ECKD */
 575
 576         if ((basepriv->rdc_data.cu_type == 0x2105 ||
 577              basepriv->rdc_data.cu_type == 0x2107 ||
 578              basepriv->rdc_data.cu_type == 0x1750)
 579             && !(basepriv->uses_cdl && trk < 2))
 580                 dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
 581
 582         heads = basepriv->rdc_data.trk_per_cyl;
 583         begcyl = trk / heads;
 584         beghead = trk % heads;
 585         endcyl = totrk / heads;
 586         endhead = totrk % heads;
 587
 588         /* check for sequential prestage - enhance cylinder range */
 589         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
 590             dedata->attributes.operation == DASD_SEQ_ACCESS) {
 591
 592                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
 593                         endcyl += basepriv->attrib.nr_cyl;
 594                 else
 595                         endcyl = (basepriv->real_cyl - 1);
 596         }
 597
 598         set_ch_t(&dedata->beg_ext, begcyl, beghead);
 599         set_ch_t(&dedata->end_ext, endcyl, endhead);
 600
 601         if (format == 1) {
 602                 fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
 603                               basedev, blksize, tlf);
 604         }
 605
 606         return rc;
 607 }
 608
 609 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 610                   unsigned int trk, unsigned int totrk, int cmd,
 611                   struct dasd_device *basedev, struct dasd_device *startdev)
 612 {
 613         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
 614                           0, 0, 0, 0, 0);
 615 }
 616
 617 static void
 618 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
 619               unsigned int rec_on_trk, int no_rec, int cmd,
 620               struct dasd_device * device, int reclen)
 621 {
 622         struct dasd_eckd_private *private;
 623         int sector;
 624         int dn, d;
 625
 626         private = (struct dasd_eckd_private *) device->private;
 627
 628         DBF_DEV_EVENT(DBF_INFO, device,
 629                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 630                   trk, rec_on_trk, no_rec, cmd, reclen);
 631
 632         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 633         ccw->flags = 0;
 634         ccw->count = 16;
 635         ccw->cda = (__u32) __pa(data);
 636
 637         memset(data, 0, sizeof(struct LO_eckd_data));
 638         sector = 0;
 639         if (rec_on_trk) {
 640                 switch (private->rdc_data.dev_type) {
 641                 case 0x3390:
 642                         dn = ceil_quot(reclen + 6, 232);
 643                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 644                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 645                         break;
 646                 case 0x3380:
 647                         d = 7 + ceil_quot(reclen + 12, 32);
 648                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 649                         break;
 650                 }
 651         }
 652         data->sector = sector;
 653         data->count = no_rec;
 654         switch (cmd) {
 655         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 656                 data->operation.orientation = 0x3;
 657                 data->operation.operation = 0x03;
 658                 break;
 659         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 660                 data->operation.orientation = 0x3;
 661                 data->operation.operation = 0x16;
 662                 break;
 663         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 664                 data->operation.orientation = 0x1;
 665                 data->operation.operation = 0x03;
 666                 data->count++;
 667                 break;
 668         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 669                 data->operation.orientation = 0x3;
 670                 data->operation.operation = 0x16;
 671                 data->count++;
 672                 break;
 673         case DASD_ECKD_CCW_WRITE:
 674         case DASD_ECKD_CCW_WRITE_MT:
 675         case DASD_ECKD_CCW_WRITE_KD:
 676         case DASD_ECKD_CCW_WRITE_KD_MT:
 677                 data->auxiliary.last_bytes_used = 0x1;
 678                 data->length = reclen;
 679                 data->operation.operation = 0x01;
 680                 break;
 681         case DASD_ECKD_CCW_WRITE_CKD:
 682         case DASD_ECKD_CCW_WRITE_CKD_MT:
 683                 data->auxiliary.last_bytes_used = 0x1;
 684                 data->length = reclen;
 685                 data->operation.operation = 0x03;
 686                 break;
 687         case DASD_ECKD_CCW_READ:
 688         case DASD_ECKD_CCW_READ_MT:
 689         case DASD_ECKD_CCW_READ_KD:
 690         case DASD_ECKD_CCW_READ_KD_MT:
 691                 data->auxiliary.last_bytes_used = 0x1;
 692                 data->length = reclen;
 693                 data->operation.operation = 0x06;
 694                 break;
 695         case DASD_ECKD_CCW_READ_CKD:
 696         case DASD_ECKD_CCW_READ_CKD_MT:
 697                 data->auxiliary.last_bytes_used = 0x1;
 698                 data->length = reclen;
 699                 data->operation.operation = 0x16;
 700                 break;
 701         case DASD_ECKD_CCW_READ_COUNT:
 702                 data->operation.operation = 0x06;
 703                 break;
 704         case DASD_ECKD_CCW_ERASE:
 705                 data->length = reclen;
 706                 data->auxiliary.last_bytes_used = 0x1;
 707                 data->operation.operation = 0x0b;
 708                 break;
 709         default:
 710                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
 711                               "opcode 0x%x", cmd);
 712         }
 713         set_ch_t(&data->seek_addr,
 714                  trk / private->rdc_data.trk_per_cyl,
 715                  trk % private->rdc_data.trk_per_cyl);
 716         data->search_arg.cyl = data->seek_addr.cyl;
 717         data->search_arg.head = data->seek_addr.head;
 718         data->search_arg.record = rec_on_trk;
 719 }
 720
 721 /*
 722  * Returns 1 if the block is one of the special blocks that needs
 723  * to get read/written with the KD variant of the command.
 724  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 725  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 726  * Luckily the KD variants differ only by one bit (0x08) from the
 727  * normal variant. So don't wonder about code like:
 728  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 729  *         ccw->cmd_code |= 0x8;
 730  */
 731 static inline int
 732 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 733 {
 734         if (recid < 3)
 735                 return 1;
 736         if (recid < blk_per_trk)
 737                 return 0;
 738         if (recid < 2 * blk_per_trk)
 739                 return 1;
 740         return 0;
 741 }
 742
 743 /*
 744  * Returns the record size for the special blocks of the cdl format.
 745  * Only returns something useful if dasd_eckd_cdl_special is true
 746  * for the recid.
 747  */
 748 static inline int
 749 dasd_eckd_cdl_reclen(int recid)
 750 {
 751         if (recid < 3)
 752                 return sizes_trk0[recid];
 753         return LABEL_SIZE;
 754 }
 755
 756 /*
 757  * Generate device unique id that specifies the physical device.
 758  */
 759 static int dasd_eckd_generate_uid(struct dasd_device *device)
 760 {
 761         struct dasd_eckd_private *private;
 762         struct dasd_uid *uid;
 763         int count;
 764         unsigned long flags;
 765
 766         private = (struct dasd_eckd_private *) device->private;
 767         if (!private)
 768                 return -ENODEV;
 769         if (!private->ned || !private->gneq)
 770                 return -ENODEV;
 771         uid = &private->uid;
 772         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 773         memset(uid, 0, sizeof(struct dasd_uid));
 774         memcpy(uid->vendor, private->ned->HDA_manufacturer,
 775                sizeof(uid->vendor) - 1);
 776         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 777         memcpy(uid->serial, private->ned->HDA_location,
 778                sizeof(uid->serial) - 1);
 779         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 780         uid->ssid = private->gneq->subsystemID;
 781         uid->real_unit_addr = private->ned->unit_addr;
 782         if (private->sneq) {
 783                 uid->type = private->sneq->sua_flags;
 784                 if (uid->type == UA_BASE_PAV_ALIAS)
 785                         uid->base_unit_addr = private->sneq->base_unit_addr;
 786         } else {
 787                 uid->type = UA_BASE_DEVICE;
 788         }
 789         if (private->vdsneq) {
 790                 for (count = 0; count < 16; count++) {
 791                         sprintf(uid->vduit+2*count, "%02x",
 792                                 private->vdsneq->uit[count]);
 793                 }
 794         }
 795         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 796         return 0;
 797 }
 798
 799 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
 800 {
 801         struct dasd_eckd_private *private;
 802         unsigned long flags;
 803
 804         if (device->private) {
 805                 private = (struct dasd_eckd_private *)device->private;
 806                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 807                 *uid = private->uid;
 808                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 809                 return 0;
 810         }
 811         return -EINVAL;
 812 }
 813
 814 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
 815                                    struct dasd_ccw_req *cqr,
 816                                    __u8 *rcd_buffer,
 817                                    __u8 lpm)
 818 {
 819         struct ccw1 *ccw;
 820         /*
 821          * buffer has to start with EBCDIC "V1.0" to show
 822          * support for virtual device SNEQ
 823          */
 824         rcd_buffer[0] = 0xE5;
 825         rcd_buffer[1] = 0xF1;
 826         rcd_buffer[2] = 0x4B;
 827         rcd_buffer[3] = 0xF0;
 828
 829         ccw = cqr->cpaddr;
 830         ccw->cmd_code = DASD_ECKD_CCW_RCD;
 831         ccw->flags = 0;
 832         ccw->cda = (__u32)(addr_t)rcd_buffer;
 833         ccw->count = DASD_ECKD_RCD_DATA_SIZE;
 834         cqr->magic = DASD_ECKD_MAGIC;
 835
 836         cqr->startdev = device;
 837         cqr->memdev = device;
 838         cqr->block = NULL;
 839         cqr->expires = 10*HZ;
 840         cqr->lpm = lpm;
 841         cqr->retries = 256;
 842         cqr->buildclk = get_clock();
 843         cqr->status = DASD_CQR_FILLED;
 844         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
 845 }
 846
 847 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
 848                                            struct dasd_ccw_req *cqr,
 849                                            __u8 *rcd_buffer,
 850                                            __u8 lpm)
 851 {
 852         struct ciw *ciw;
 853         int rc;
 854         /*
 855          * sanity check: scan for RCD command in extended SenseID data
 856          * some devices do not support RCD
 857          */
 858         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 859         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
 860                 return -EOPNOTSUPP;
 861
 862         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
 863         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 864         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
 865         cqr->retries = 5;
 866         rc = dasd_sleep_on_immediatly(cqr);
 867         return rc;
 868 }
 869
 870 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 871                                    void **rcd_buffer,
 872                                    int *rcd_buffer_size, __u8 lpm)
 873 {
 874         struct ciw *ciw;
 875         char *rcd_buf = NULL;
 876         int ret;
 877         struct dasd_ccw_req *cqr;
 878
 879         /*
 880          * sanity check: scan for RCD command in extended SenseID data
 881          * some devices do not support RCD
 882          */
 883         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 884         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
 885                 ret = -EOPNOTSUPP;
 886                 goto out_error;
 887         }
 888         rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
 889         if (!rcd_buf) {
 890                 ret = -ENOMEM;
 891                 goto out_error;
 892         }
 893         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
 894                                    0, /* use rcd_buf as data ara */
 895                                    device);
 896         if (IS_ERR(cqr)) {
 897                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 898                               "Could not allocate RCD request");
 899                 ret = -ENOMEM;
 900                 goto out_error;
 901         }
 902         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
 903         ret = dasd_sleep_on(cqr);
 904         /*
 905          * on success we update the user input parms
 906          */
 907         dasd_sfree_request(cqr, cqr->memdev);
 908         if (ret)
 909                 goto out_error;
 910
 911         *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
 912         *rcd_buffer = rcd_buf;
 913         return 0;
 914 out_error:
 915         kfree(rcd_buf);
 916         *rcd_buffer = NULL;
 917         *rcd_buffer_size = 0;
 918         return ret;
 919 }
 920
 921 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
 922 {
 923
 924         struct dasd_sneq *sneq;
 925         int i, count;
 926
 927         private->ned = NULL;
 928         private->sneq = NULL;
 929         private->vdsneq = NULL;
 930         private->gneq = NULL;
 931         count = private->conf_len / sizeof(struct dasd_sneq);
 932         sneq = (struct dasd_sneq *)private->conf_data;
 933         for (i = 0; i < count; ++i) {
 934                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 935                         private->sneq = sneq;
 936                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 937                         private->vdsneq = (struct vd_sneq *)sneq;
 938                 else if (sneq->flags.identifier == 2)
 939                         private->gneq = (struct dasd_gneq *)sneq;
 940                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 941                         private->ned = (struct dasd_ned *)sneq;
 942                 sneq++;
 943         }
 944         if (!private->ned || !private->gneq) {
 945                 private->ned = NULL;
 946                 private->sneq = NULL;
 947                 private->vdsneq = NULL;
 948                 private->gneq = NULL;
 949                 return -EINVAL;
 950         }
 951         return 0;
 952
 953 };
 954
 955 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
 956 {
 957         struct dasd_gneq *gneq;
 958         int i, count, found;
 959
 960         count = conf_len / sizeof(*gneq);
 961         gneq = (struct dasd_gneq *)conf_data;
 962         found = 0;
 963         for (i = 0; i < count; ++i) {
 964                 if (gneq->flags.identifier == 2) {
 965                         found = 1;
 966                         break;
 967                 }
 968                 gneq++;
 969         }
 970         if (found)
 971                 return ((char *)gneq)[18] & 0x07;
 972         else
 973                 return 0;
 974 }
 975
 976 static int dasd_eckd_read_conf(struct dasd_device *device)
 977 {
 978         void *conf_data;
 979         int conf_len, conf_data_saved;
 980         int rc;
 981         __u8 lpm, opm;
 982         struct dasd_eckd_private *private;
 983         struct dasd_path *path_data;
 984
 985         private = (struct dasd_eckd_private *) device->private;
 986         path_data = &device->path_data;
 987         opm = ccw_device_get_path_mask(device->cdev);
 988         lpm = 0x80;
 989         conf_data_saved = 0;
 990         /* get configuration data per operational path */
 991         for (lpm = 0x80; lpm; lpm>>= 1) {
 992                 if (lpm & opm) {
 993                         rc = dasd_eckd_read_conf_lpm(device, &conf_data,
 994                                                      &conf_len, lpm);
 995                         if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
 996                                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
 997                                           "Read configuration data returned "
 998                                           "error %d", rc);
 999                                 return rc;
1000                         }
1001                         if (conf_data == NULL) {
1002                                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1003                                                 "No configuration data "
1004                                                 "retrieved");
1005                                 /* no further analysis possible */
1006                                 path_data->opm |= lpm;
1007                                 continue;       /* no error */
1008                         }
1009                         /* save first valid configuration data */
1010                         if (!conf_data_saved) {
1011                                 kfree(private->conf_data);
1012                                 private->conf_data = conf_data;
1013                                 private->conf_len = conf_len;
1014                                 if (dasd_eckd_identify_conf_parts(private)) {
1015                                         private->conf_data = NULL;
1016                                         private->conf_len = 0;
1017                                         kfree(conf_data);
1018                                         continue;
1019                                 }
1020                                 conf_data_saved++;
1021                         }
1022                         switch (dasd_eckd_path_access(conf_data, conf_len)) {
1023                         case 0x02:
1024                                 path_data->npm |= lpm;
1025                                 break;
1026                         case 0x03:
1027                                 path_data->ppm |= lpm;
1028                                 break;
1029                         }
1030                         path_data->opm |= lpm;
1031                         if (conf_data != private->conf_data)
1032                                 kfree(conf_data);
1033                 }
1034         }
1035         return 0;
1036 }
1037
1038 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1039 {
1040         struct dasd_eckd_private *private;
1041         int mdc;
1042         u32 fcx_max_data;
1043
1044         private = (struct dasd_eckd_private *) device->private;
1045         if (private->fcx_max_data) {
1046                 mdc = ccw_device_get_mdc(device->cdev, lpm);
1047                 if ((mdc < 0)) {
1048                         dev_warn(&device->cdev->dev,
1049                                  "Detecting the maximum data size for zHPF "
1050                                  "requests failed (rc=%d) for a new path %x\n",
1051                                  mdc, lpm);
1052                         return mdc;
1053                 }
1054                 fcx_max_data = mdc * FCX_MAX_DATA_FACTOR;
1055                 if (fcx_max_data < private->fcx_max_data) {
1056                         dev_warn(&device->cdev->dev,
1057                                  "The maximum data size for zHPF requests %u "
1058                                  "on a new path %x is below the active maximum "
1059                                  "%u\n", fcx_max_data, lpm,
1060                                  private->fcx_max_data);
1061                         return -EACCES;
1062                 }
1063         }
1064         return 0;
1065 }
1066
1067 static void do_path_verification_work(struct work_struct *work)
1068 {
1069         struct path_verification_work_data *data;
1070         struct dasd_device *device;
1071         __u8 lpm, opm, npm, ppm, epm;
1072         unsigned long flags;
1073         int rc;
1074
1075         data = container_of(work, struct path_verification_work_data, worker);
1076         device = data->device;
1077
1078         opm = 0;
1079         npm = 0;
1080         ppm = 0;
1081         epm = 0;
1082         for (lpm = 0x80; lpm; lpm >>= 1) {
1083                 if (lpm & data->tbvpm) {
1084                         memset(data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1085                         memset(&data->cqr, 0, sizeof(data->cqr));
1086                         data->cqr.cpaddr = &data->ccw;
1087                         rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1088                                                              data->rcd_buffer,
1089                                                              lpm);
1090                         if (!rc) {
1091                                 switch (dasd_eckd_path_access(data->rcd_buffer,
1092                                                      DASD_ECKD_RCD_DATA_SIZE)) {
1093                                 case 0x02:
1094                                         npm |= lpm;
1095                                         break;
1096                                 case 0x03:
1097                                         ppm |= lpm;
1098                                         break;
1099                                 }
1100                                 opm |= lpm;
1101                         } else if (rc == -EOPNOTSUPP) {
1102                                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1103                                        "path verification: No configuration "
1104                                        "data retrieved");
1105                                 opm |= lpm;
1106                         } else if (rc == -EAGAIN) {
1107                                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1108                                         "path verification: device is stopped,"
1109                                         " try again later");
1110                                 epm |= lpm;
1111                         } else {
1112                                 dev_warn(&device->cdev->dev,
1113                                          "Reading device feature codes failed "
1114                                          "(rc=%d) for new path %x\n", rc, lpm);
1115                                 continue;
1116                         }
1117                         if (verify_fcx_max_data(device, lpm)) {
1118                                 opm &= ~lpm;
1119                                 npm &= ~lpm;
1120                                 ppm &= ~lpm;
1121                         }
1122                 }
1123         }
1124         /*
1125          * There is a small chance that a path is lost again between
1126          * above path verification and the following modification of
1127          * the device opm mask. We could avoid that race here by using
1128          * yet another path mask, but we rather deal with this unlikely
1129          * situation in dasd_start_IO.
1130          */
1131         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1132         if (!device->path_data.opm && opm) {
1133                 device->path_data.opm = opm;
1134                 dasd_generic_path_operational(device);
1135         } else
1136                 device->path_data.opm |= opm;
1137         device->path_data.npm |= npm;
1138         device->path_data.ppm |= ppm;
1139         device->path_data.tbvpm |= epm;
1140         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1141
1142         dasd_put_device(device);
1143         if (data->isglobal)
1144                 mutex_unlock(&dasd_path_verification_mutex);
1145         else
1146                 kfree(data);
1147 }
1148
1149 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1150 {
1151         struct path_verification_work_data *data;
1152
1153         data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1154         if (!data) {
1155                 if (mutex_trylock(&dasd_path_verification_mutex)) {
1156                         data = path_verification_worker;
1157                         data->isglobal = 1;
1158                 } else
1159                         return -ENOMEM;
1160         } else {
1161                 memset(data, 0, sizeof(*data));
1162                 data->isglobal = 0;
1163         }
1164         INIT_WORK(&data->worker, do_path_verification_work);
1165         dasd_get_device(device);
1166         data->device = device;
1167         data->tbvpm = lpm;
1168         schedule_work(&data->worker);
1169         return 0;
1170 }
1171
1172 static int dasd_eckd_read_features(struct dasd_device *device)
1173 {
1174         struct dasd_psf_prssd_data *prssdp;
1175         struct dasd_rssd_features *features;
1176         struct dasd_ccw_req *cqr;
1177         struct ccw1 *ccw;
1178         int rc;
1179         struct dasd_eckd_private *private;
1180
1181         private = (struct dasd_eckd_private *) device->private;
1182         memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1183         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1184                                    (sizeof(struct dasd_psf_prssd_data) +
1185                                     sizeof(struct dasd_rssd_features)),
1186                                    device);
1187         if (IS_ERR(cqr)) {
1188                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1189                                 "allocate initialization request");
1190                 return PTR_ERR(cqr);
1191         }
1192         cqr->startdev = device;
1193         cqr->memdev = device;
1194         cqr->block = NULL;
1195         cqr->retries = 256;
1196         cqr->expires = 10 * HZ;
1197
1198         /* Prepare for Read Subsystem Data */
1199         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1200         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1201         prssdp->order = PSF_ORDER_PRSSD;
1202         prssdp->suborder = 0x41;        /* Read Feature Codes */
1203         /* all other bytes of prssdp must be zero */
1204
1205         ccw = cqr->cpaddr;
1206         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1207         ccw->count = sizeof(struct dasd_psf_prssd_data);
1208         ccw->flags |= CCW_FLAG_CC;
1209         ccw->cda = (__u32)(addr_t) prssdp;
1210
1211         /* Read Subsystem Data - feature codes */
1212         features = (struct dasd_rssd_features *) (prssdp + 1);
1213         memset(features, 0, sizeof(struct dasd_rssd_features));
1214
1215         ccw++;
1216         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1217         ccw->count = sizeof(struct dasd_rssd_features);
1218         ccw->cda = (__u32)(addr_t) features;
1219
1220         cqr->buildclk = get_clock();
1221         cqr->status = DASD_CQR_FILLED;
1222         rc = dasd_sleep_on(cqr);
1223         if (rc == 0) {
1224                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1225                 features = (struct dasd_rssd_features *) (prssdp + 1);
1226                 memcpy(&private->features, features,
1227                        sizeof(struct dasd_rssd_features));
1228         } else
1229                 dev_warn(&device->cdev->dev, "Reading device feature codes"
1230                          " failed with rc=%d\n", rc);
1231         dasd_sfree_request(cqr, cqr->memdev);
1232         return rc;
1233 }
1234
1235
1236 /*
1237  * Build CP for Perform Subsystem Function - SSC.
1238  */
1239 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1240                                                     int enable_pav)
1241 {
1242         struct dasd_ccw_req *cqr;
1243         struct dasd_psf_ssc_data *psf_ssc_data;
1244         struct ccw1 *ccw;
1245
1246         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1247                                   sizeof(struct dasd_psf_ssc_data),
1248                                   device);
1249
1250         if (IS_ERR(cqr)) {
1251                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1252                            "Could not allocate PSF-SSC request");
1253                 return cqr;
1254         }
1255         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1256         psf_ssc_data->order = PSF_ORDER_SSC;
1257         psf_ssc_data->suborder = 0xc0;
1258         if (enable_pav) {
1259                 psf_ssc_data->suborder |= 0x08;
1260                 psf_ssc_data->reserved[0] = 0x88;
1261         }
1262         ccw = cqr->cpaddr;
1263         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1264         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1265         ccw->count = 66;
1266
1267         cqr->startdev = device;
1268         cqr->memdev = device;
1269         cqr->block = NULL;
1270         cqr->retries = 256;
1271         cqr->expires = 10*HZ;
1272         cqr->buildclk = get_clock();
1273         cqr->status = DASD_CQR_FILLED;
1274         return cqr;
1275 }
1276
1277 /*
1278  * Perform Subsystem Function.
1279  * It is necessary to trigger CIO for channel revalidation since this
1280  * call might change behaviour of DASD devices.
1281  */
1282 static int
1283 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav)
1284 {
1285         struct dasd_ccw_req *cqr;
1286         int rc;
1287
1288         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1289         if (IS_ERR(cqr))
1290                 return PTR_ERR(cqr);
1291
1292         rc = dasd_sleep_on(cqr);
1293         if (!rc)
1294                 /* trigger CIO to reprobe devices */
1295                 css_schedule_reprobe();
1296         dasd_sfree_request(cqr, cqr->memdev);
1297         return rc;
1298 }
1299
1300 /*
1301  * Valide storage server of current device.
1302  */
1303 static void dasd_eckd_validate_server(struct dasd_device *device)
1304 {
1305         int rc;
1306         struct dasd_eckd_private *private;
1307         int enable_pav;
1308
1309         if (dasd_nopav || MACHINE_IS_VM)
1310                 enable_pav = 0;
1311         else
1312                 enable_pav = 1;
1313         rc = dasd_eckd_psf_ssc(device, enable_pav);
1314
1315         /* may be requested feature is not available on server,
1316          * therefore just report error and go ahead */
1317         private = (struct dasd_eckd_private *) device->private;
1318         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1319                         "returned rc=%d", private->uid.ssid, rc);
1320 }
1321
1322 static u32 get_fcx_max_data(struct dasd_device *device)
1323 {
1324 #if defined(CONFIG_64BIT)
1325         int tpm, mdc;
1326         int fcx_in_css, fcx_in_gneq, fcx_in_features;
1327         struct dasd_eckd_private *private;
1328
1329         if (dasd_nofcx)
1330                 return 0;
1331         /* is transport mode supported? */
1332         private = (struct dasd_eckd_private *) device->private;
1333         fcx_in_css = css_general_characteristics.fcx;
1334         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1335         fcx_in_features = private->features.feature[40] & 0x80;
1336         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1337
1338         if (!tpm)
1339                 return 0;
1340
1341         mdc = ccw_device_get_mdc(device->cdev, 0);
1342         if (mdc < 0) {
1343                 dev_warn(&device->cdev->dev, "Detecting the maximum supported"
1344                          " data size for zHPF requests failed\n");
1345                 return 0;
1346         } else
1347                 return mdc * FCX_MAX_DATA_FACTOR;
1348 #else
1349         return 0;
1350 #endif
1351 }
1352
1353 /*
1354  * Check device characteristics.
1355  * If the device is accessible using ECKD discipline, the device is enabled.
1356  */
1357 static int
1358 dasd_eckd_check_characteristics(struct dasd_device *device)
1359 {
1360         struct dasd_eckd_private *private;
1361         struct dasd_block *block;
1362         struct dasd_uid temp_uid;
1363         int is_known, rc, i;
1364         int readonly;
1365         unsigned long value;
1366
1367         if (!ccw_device_is_pathgroup(device->cdev)) {
1368                 dev_warn(&device->cdev->dev,
1369                          "A channel path group could not be established\n");
1370                 return -EIO;
1371         }
1372         if (!ccw_device_is_multipath(device->cdev)) {
1373                 dev_info(&device->cdev->dev,
1374                          "The DASD is not operating in multipath mode\n");
1375         }
1376         private = (struct dasd_eckd_private *) device->private;
1377         if (!private) {
1378                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1379                 if (!private) {
1380                         dev_warn(&device->cdev->dev,
1381                                  "Allocating memory for private DASD data "
1382                                  "failed\n");
1383                         return -ENOMEM;
1384                 }
1385                 device->private = (void *) private;
1386         } else {
1387                 memset(private, 0, sizeof(*private));
1388         }
1389         /* Invalidate status of initial analysis. */
1390         private->init_cqr_status = -1;
1391         /* Set default cache operations. */
1392         private->attrib.operation = DASD_NORMAL_CACHE;
1393         private->attrib.nr_cyl = 0;
1394
1395         /* Read Configuration Data */
1396         rc = dasd_eckd_read_conf(device);
1397         if (rc)
1398                 goto out_err1;
1399
1400         /* set default timeout */
1401         device->default_expires = DASD_EXPIRES;
1402         if (private->gneq) {
1403                 value = 1;
1404                 for (i = 0; i < private->gneq->timeout.value; i++)
1405                         value = 10 * value;
1406                 value = value * private->gneq->timeout.number;
1407                 /* do not accept useless values */
1408                 if (value != 0 && value <= DASD_EXPIRES_MAX)
1409                         device->default_expires = value;
1410         }
1411
1412         /* Generate device unique id */
1413         rc = dasd_eckd_generate_uid(device);
1414         if (rc)
1415                 goto out_err1;
1416
1417         dasd_eckd_get_uid(device, &temp_uid);
1418         if (temp_uid.type == UA_BASE_DEVICE) {
1419                 block = dasd_alloc_block();
1420                 if (IS_ERR(block)) {
1421                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1422                                         "could not allocate dasd "
1423                                         "block structure");
1424                         rc = PTR_ERR(block);
1425                         goto out_err1;
1426                 }
1427                 device->block = block;
1428                 block->base = device;
1429         }
1430
1431         /* register lcu with alias handling, enable PAV if this is a new lcu */
1432         is_known = dasd_alias_make_device_known_to_lcu(device);
1433         if (is_known < 0) {
1434                 rc = is_known;
1435                 goto out_err2;
1436         }
1437         /*
1438          * dasd_eckd_validate_server is done on the first device that
1439          * is found for an LCU. All later other devices have to wait
1440          * for it, so they will read the correct feature codes.
1441          */
1442         if (!is_known) {
1443                 dasd_eckd_validate_server(device);
1444                 dasd_alias_lcu_setup_complete(device);
1445         } else
1446                 dasd_alias_wait_for_lcu_setup(device);
1447
1448         /* device may report different configuration data after LCU setup */
1449         rc = dasd_eckd_read_conf(device);
1450         if (rc)
1451                 goto out_err3;
1452
1453         /* Read Feature Codes */
1454         dasd_eckd_read_features(device);
1455
1456         /* Read Device Characteristics */
1457         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1458                                          &private->rdc_data, 64);
1459         if (rc) {
1460                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1461                                 "Read device characteristic failed, rc=%d", rc);
1462                 goto out_err3;
1463         }
1464         /* find the valid cylinder size */
1465         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1466             private->rdc_data.long_no_cyl)
1467                 private->real_cyl = private->rdc_data.long_no_cyl;
1468         else
1469                 private->real_cyl = private->rdc_data.no_cyl;
1470
1471         private->fcx_max_data = get_fcx_max_data(device);
1472
1473         readonly = dasd_device_is_ro(device);
1474         if (readonly)
1475                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1476
1477         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1478                  "with %d cylinders, %d heads, %d sectors%s\n",
1479                  private->rdc_data.dev_type,
1480                  private->rdc_data.dev_model,
1481                  private->rdc_data.cu_type,
1482                  private->rdc_data.cu_model.model,
1483                  private->real_cyl,
1484                  private->rdc_data.trk_per_cyl,
1485                  private->rdc_data.sec_per_trk,
1486                  readonly ? ", read-only device" : "");
1487         return 0;
1488
1489 out_err3:
1490         dasd_alias_disconnect_device_from_lcu(device);
1491 out_err2:
1492         dasd_free_block(device->block);
1493         device->block = NULL;
1494 out_err1:
1495         kfree(private->conf_data);
1496         kfree(device->private);
1497         device->private = NULL;
1498         return rc;
1499 }
1500
1501 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1502 {
1503         struct dasd_eckd_private *private;
1504
1505         private = (struct dasd_eckd_private *) device->private;
1506         dasd_alias_disconnect_device_from_lcu(device);
1507         private->ned = NULL;
1508         private->sneq = NULL;
1509         private->vdsneq = NULL;
1510         private->gneq = NULL;
1511         private->conf_len = 0;
1512         kfree(private->conf_data);
1513         private->conf_data = NULL;
1514 }
1515
1516 static struct dasd_ccw_req *
1517 dasd_eckd_analysis_ccw(struct dasd_device *device)
1518 {
1519         struct dasd_eckd_private *private;
1520         struct eckd_count *count_data;
1521         struct LO_eckd_data *LO_data;
1522         struct dasd_ccw_req *cqr;
1523         struct ccw1 *ccw;
1524         int cplength, datasize;
1525         int i;
1526
1527         private = (struct dasd_eckd_private *) device->private;
1528
1529         cplength = 8;
1530         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1531         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1532         if (IS_ERR(cqr))
1533                 return cqr;
1534         ccw = cqr->cpaddr;
1535         /* Define extent for the first 3 tracks. */
1536         define_extent(ccw++, cqr->data, 0, 2,
1537                       DASD_ECKD_CCW_READ_COUNT, device);
1538         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1539         /* Locate record for the first 4 records on track 0. */
1540         ccw[-1].flags |= CCW_FLAG_CC;
1541         locate_record(ccw++, LO_data++, 0, 0, 4,
1542                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1543
1544         count_data = private->count_area;
1545         for (i = 0; i < 4; i++) {
1546                 ccw[-1].flags |= CCW_FLAG_CC;
1547                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1548                 ccw->flags = 0;
1549                 ccw->count = 8;
1550                 ccw->cda = (__u32)(addr_t) count_data;
1551                 ccw++;
1552                 count_data++;
1553         }
1554
1555         /* Locate record for the first record on track 2. */
1556         ccw[-1].flags |= CCW_FLAG_CC;
1557         locate_record(ccw++, LO_data++, 2, 0, 1,
1558                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1559         /* Read count ccw. */
1560         ccw[-1].flags |= CCW_FLAG_CC;
1561         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1562         ccw->flags = 0;
1563         ccw->count = 8;
1564         ccw->cda = (__u32)(addr_t) count_data;
1565
1566         cqr->block = NULL;
1567         cqr->startdev = device;
1568         cqr->memdev = device;
1569         cqr->retries = 255;
1570         cqr->buildclk = get_clock();
1571         cqr->status = DASD_CQR_FILLED;
1572         return cqr;
1573 }
1574
1575 /* differentiate between 'no record found' and any other error */
1576 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1577 {
1578         char *sense;
1579         if (init_cqr->status == DASD_CQR_DONE)
1580                 return INIT_CQR_OK;
1581         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1582                  init_cqr->status == DASD_CQR_FAILED) {
1583                 sense = dasd_get_sense(&init_cqr->irb);
1584                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1585                         return INIT_CQR_UNFORMATTED;
1586                 else
1587                         return INIT_CQR_ERROR;
1588         } else
1589                 return INIT_CQR_ERROR;
1590 }
1591
1592 /*
1593  * This is the callback function for the init_analysis cqr. It saves
1594  * the status of the initial analysis ccw before it frees it and kicks
1595  * the device to continue the startup sequence. This will call
1596  * dasd_eckd_do_analysis again (if the devices has not been marked
1597  * for deletion in the meantime).
1598  */
1599 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1600                                         void *data)
1601 {
1602         struct dasd_eckd_private *private;
1603         struct dasd_device *device;
1604
1605         device = init_cqr->startdev;
1606         private = (struct dasd_eckd_private *) device->private;
1607         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1608         dasd_sfree_request(init_cqr, device);
1609         dasd_kick_device(device);
1610 }
1611
1612 static int dasd_eckd_start_analysis(struct dasd_block *block)
1613 {
1614         struct dasd_eckd_private *private;
1615         struct dasd_ccw_req *init_cqr;
1616
1617         private = (struct dasd_eckd_private *) block->base->private;
1618         init_cqr = dasd_eckd_analysis_ccw(block->base);
1619         if (IS_ERR(init_cqr))
1620                 return PTR_ERR(init_cqr);
1621         init_cqr->callback = dasd_eckd_analysis_callback;
1622         init_cqr->callback_data = NULL;
1623         init_cqr->expires = 5*HZ;
1624         /* first try without ERP, so we can later handle unformatted
1625          * devices as special case
1626          */
1627         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1628         init_cqr->retries = 0;
1629         dasd_add_request_head(init_cqr);
1630         return -EAGAIN;
1631 }
1632
1633 static int dasd_eckd_end_analysis(struct dasd_block *block)
1634 {
1635         struct dasd_device *device;
1636         struct dasd_eckd_private *private;
1637         struct eckd_count *count_area;
1638         unsigned int sb, blk_per_trk;
1639         int status, i;
1640         struct dasd_ccw_req *init_cqr;
1641
1642         device = block->base;
1643         private = (struct dasd_eckd_private *) device->private;
1644         status = private->init_cqr_status;
1645         private->init_cqr_status = -1;
1646         if (status == INIT_CQR_ERROR) {
1647                 /* try again, this time with full ERP */
1648                 init_cqr = dasd_eckd_analysis_ccw(device);
1649                 dasd_sleep_on(init_cqr);
1650                 status = dasd_eckd_analysis_evaluation(init_cqr);
1651                 dasd_sfree_request(init_cqr, device);
1652         }
1653
1654         if (device->features & DASD_FEATURE_USERAW) {
1655                 block->bp_block = DASD_RAW_BLOCKSIZE;
1656                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1657                 block->s2b_shift = 3;
1658                 goto raw;
1659         }
1660
1661         if (status == INIT_CQR_UNFORMATTED) {
1662                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1663                 return -EMEDIUMTYPE;
1664         } else if (status == INIT_CQR_ERROR) {
1665                 dev_err(&device->cdev->dev,
1666                         "Detecting the DASD disk layout failed because "
1667                         "of an I/O error\n");
1668                 return -EIO;
1669         }
1670
1671         private->uses_cdl = 1;
1672         /* Check Track 0 for Compatible Disk Layout */
1673         count_area = NULL;
1674         for (i = 0; i < 3; i++) {
1675                 if (private->count_area[i].kl != 4 ||
1676                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
1677                         private->uses_cdl = 0;
1678                         break;
1679                 }
1680         }
1681         if (i == 3)
1682                 count_area = &private->count_area[4];
1683
1684         if (private->uses_cdl == 0) {
1685                 for (i = 0; i < 5; i++) {
1686                         if ((private->count_area[i].kl != 0) ||
1687                             (private->count_area[i].dl !=
1688                              private->count_area[0].dl))
1689                                 break;
1690                 }
1691                 if (i == 5)
1692                         count_area = &private->count_area[0];
1693         } else {
1694                 if (private->count_area[3].record == 1)
1695                         dev_warn(&device->cdev->dev,
1696                                  "Track 0 has no records following the VTOC\n");
1697         }
1698
1699         if (count_area != NULL && count_area->kl == 0) {
1700                 /* we found notthing violating our disk layout */
1701                 if (dasd_check_blocksize(count_area->dl) == 0)
1702                         block->bp_block = count_area->dl;
1703         }
1704         if (block->bp_block == 0) {
1705                 dev_warn(&device->cdev->dev,
1706                          "The disk layout of the DASD is not supported\n");
1707                 return -EMEDIUMTYPE;
1708         }
1709         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1710         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1711                 block->s2b_shift++;
1712
1713         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1714
1715 raw:
1716         block->blocks = (private->real_cyl *
1717                           private->rdc_data.trk_per_cyl *
1718                           blk_per_trk);
1719
1720         dev_info(&device->cdev->dev,
1721                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
1722                  "%s\n", (block->bp_block >> 10),
1723                  ((private->real_cyl *
1724                    private->rdc_data.trk_per_cyl *
1725                    blk_per_trk * (block->bp_block >> 9)) >> 1),
1726                  ((blk_per_trk * block->bp_block) >> 10),
1727                  private->uses_cdl ?
1728                  "compatible disk layout" : "linux disk layout");
1729
1730         return 0;
1731 }
1732
1733 static int dasd_eckd_do_analysis(struct dasd_block *block)
1734 {
1735         struct dasd_eckd_private *private;
1736
1737         private = (struct dasd_eckd_private *) block->base->private;
1738         if (private->init_cqr_status < 0)
1739                 return dasd_eckd_start_analysis(block);
1740         else
1741                 return dasd_eckd_end_analysis(block);
1742 }
1743
1744 static int dasd_eckd_ready_to_online(struct dasd_device *device)
1745 {
1746         return dasd_alias_add_device(device);
1747 };
1748
1749 static int dasd_eckd_online_to_ready(struct dasd_device *device)
1750 {
1751         cancel_work_sync(&device->reload_device);
1752         return dasd_alias_remove_device(device);
1753 };
1754
1755 static int
1756 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
1757 {
1758         struct dasd_eckd_private *private;
1759
1760         private = (struct dasd_eckd_private *) block->base->private;
1761         if (dasd_check_blocksize(block->bp_block) == 0) {
1762                 geo->sectors = recs_per_track(&private->rdc_data,
1763                                               0, block->bp_block);
1764         }
1765         geo->cylinders = private->rdc_data.no_cyl;
1766         geo->heads = private->rdc_data.trk_per_cyl;
1767         return 0;
1768 }
1769
1770 static struct dasd_ccw_req *
1771 dasd_eckd_format_device(struct dasd_device * device,
1772                         struct format_data_t * fdata)
1773 {
1774         struct dasd_eckd_private *private;
1775         struct dasd_ccw_req *fcp;
1776         struct eckd_count *ect;
1777         struct ccw1 *ccw;
1778         void *data;
1779         int rpt;
1780         struct ch_t address;
1781         int cplength, datasize;
1782         int i;
1783         int intensity = 0;
1784         int r0_perm;
1785
1786         private = (struct dasd_eckd_private *) device->private;
1787         rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
1788         set_ch_t(&address,
1789                  fdata->start_unit / private->rdc_data.trk_per_cyl,
1790                  fdata->start_unit % private->rdc_data.trk_per_cyl);
1791
1792         /* Sanity checks. */
1793         if (fdata->start_unit >=
1794             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
1795                 dev_warn(&device->cdev->dev, "Start track number %d used in "
1796                          "formatting is too big\n", fdata->start_unit);
1797                 return ERR_PTR(-EINVAL);
1798         }
1799         if (fdata->start_unit > fdata->stop_unit) {
1800                 dev_warn(&device->cdev->dev, "Start track %d used in "
1801                          "formatting exceeds end track\n", fdata->start_unit);
1802                 return ERR_PTR(-EINVAL);
1803         }
1804         if (dasd_check_blocksize(fdata->blksize) != 0) {
1805                 dev_warn(&device->cdev->dev,
1806                          "The DASD cannot be formatted with block size %d\n",
1807                          fdata->blksize);
1808                 return ERR_PTR(-EINVAL);
1809         }
1810
1811         /*
1812          * fdata->intensity is a bit string that tells us what to do:
1813          *   Bit 0: write record zero
1814          *   Bit 1: write home address, currently not supported
1815          *   Bit 2: invalidate tracks
1816          *   Bit 3: use OS/390 compatible disk layout (cdl)
1817          *   Bit 4: do not allow storage subsystem to modify record zero
1818          * Only some bit combinations do make sense.
1819          */
1820         if (fdata->intensity & 0x10) {
1821                 r0_perm = 0;
1822                 intensity = fdata->intensity & ~0x10;
1823         } else {
1824                 r0_perm = 1;
1825                 intensity = fdata->intensity;
1826         }
1827         switch (intensity) {
1828         case 0x00:      /* Normal format */
1829         case 0x08:      /* Normal format, use cdl. */
1830                 cplength = 2 + rpt;
1831                 datasize = sizeof(struct DE_eckd_data) +
1832                         sizeof(struct LO_eckd_data) +
1833                         rpt * sizeof(struct eckd_count);
1834                 break;
1835         case 0x01:      /* Write record zero and format track. */
1836         case 0x09:      /* Write record zero and format track, use cdl. */
1837                 cplength = 3 + rpt;
1838                 datasize = sizeof(struct DE_eckd_data) +
1839                         sizeof(struct LO_eckd_data) +
1840                         sizeof(struct eckd_count) +
1841                         rpt * sizeof(struct eckd_count);
1842                 break;
1843         case 0x04:      /* Invalidate track. */
1844         case 0x0c:      /* Invalidate track, use cdl. */
1845                 cplength = 3;
1846                 datasize = sizeof(struct DE_eckd_data) +
1847                         sizeof(struct LO_eckd_data) +
1848                         sizeof(struct eckd_count);
1849                 break;
1850         default:
1851                 dev_warn(&device->cdev->dev, "An I/O control call used "
1852                          "incorrect flags 0x%x\n", fdata->intensity);
1853                 return ERR_PTR(-EINVAL);
1854         }
1855         /* Allocate the format ccw request. */
1856         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1857         if (IS_ERR(fcp))
1858                 return fcp;
1859
1860         data = fcp->data;
1861         ccw = fcp->cpaddr;
1862
1863         switch (intensity & ~0x08) {
1864         case 0x00: /* Normal format. */
1865                 define_extent(ccw++, (struct DE_eckd_data *) data,
1866                               fdata->start_unit, fdata->start_unit,
1867                               DASD_ECKD_CCW_WRITE_CKD, device);
1868                 /* grant subsystem permission to format R0 */
1869                 if (r0_perm)
1870                         ((struct DE_eckd_data *)data)->ga_extended |= 0x04;
1871                 data += sizeof(struct DE_eckd_data);
1872                 ccw[-1].flags |= CCW_FLAG_CC;
1873                 locate_record(ccw++, (struct LO_eckd_data *) data,
1874                               fdata->start_unit, 0, rpt,
1875                               DASD_ECKD_CCW_WRITE_CKD, device,
1876                               fdata->blksize);
1877                 data += sizeof(struct LO_eckd_data);
1878                 break;
1879         case 0x01: /* Write record zero + format track. */
1880                 define_extent(ccw++, (struct DE_eckd_data *) data,
1881                               fdata->start_unit, fdata->start_unit,
1882                               DASD_ECKD_CCW_WRITE_RECORD_ZERO,
1883                               device);
1884                 data += sizeof(struct DE_eckd_data);
1885                 ccw[-1].flags |= CCW_FLAG_CC;
1886                 locate_record(ccw++, (struct LO_eckd_data *) data,
1887                               fdata->start_unit, 0, rpt + 1,
1888                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
1889                               device->block->bp_block);
1890                 data += sizeof(struct LO_eckd_data);
1891                 break;
1892         case 0x04: /* Invalidate track. */
1893                 define_extent(ccw++, (struct DE_eckd_data *) data,
1894                               fdata->start_unit, fdata->start_unit,
1895                               DASD_ECKD_CCW_WRITE_CKD, device);
1896                 data += sizeof(struct DE_eckd_data);
1897                 ccw[-1].flags |= CCW_FLAG_CC;
1898                 locate_record(ccw++, (struct LO_eckd_data *) data,
1899                               fdata->start_unit, 0, 1,
1900                               DASD_ECKD_CCW_WRITE_CKD, device, 8);
1901                 data += sizeof(struct LO_eckd_data);
1902                 break;
1903         }
1904         if (intensity & 0x01) { /* write record zero */
1905                 ect = (struct eckd_count *) data;
1906                 data += sizeof(struct eckd_count);
1907                 ect->cyl = address.cyl;
1908                 ect->head = address.head;
1909                 ect->record = 0;
1910                 ect->kl = 0;
1911                 ect->dl = 8;
1912                 ccw[-1].flags |= CCW_FLAG_CC;
1913                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
1914                 ccw->flags = CCW_FLAG_SLI;
1915                 ccw->count = 8;
1916                 ccw->cda = (__u32)(addr_t) ect;
1917                 ccw++;
1918         }
1919         if ((intensity & ~0x08) & 0x04) {       /* erase track */
1920                 ect = (struct eckd_count *) data;
1921                 data += sizeof(struct eckd_count);
1922                 ect->cyl = address.cyl;
1923                 ect->head = address.head;
1924                 ect->record = 1;
1925                 ect->kl = 0;
1926                 ect->dl = 0;
1927                 ccw[-1].flags |= CCW_FLAG_CC;
1928                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1929                 ccw->flags = CCW_FLAG_SLI;
1930                 ccw->count = 8;
1931                 ccw->cda = (__u32)(addr_t) ect;
1932         } else {                /* write remaining records */
1933                 for (i = 0; i < rpt; i++) {
1934                         ect = (struct eckd_count *) data;
1935                         data += sizeof(struct eckd_count);
1936                         ect->cyl = address.cyl;
1937                         ect->head = address.head;
1938                         ect->record = i + 1;
1939                         ect->kl = 0;
1940                         ect->dl = fdata->blksize;
1941                         /* Check for special tracks 0-1 when formatting CDL */
1942                         if ((intensity & 0x08) &&
1943                             fdata->start_unit == 0) {
1944                                 if (i < 3) {
1945                                         ect->kl = 4;
1946                                         ect->dl = sizes_trk0[i] - 4;
1947                                 }
1948                         }
1949                         if ((intensity & 0x08) &&
1950                             fdata->start_unit == 1) {
1951                                 ect->kl = 44;
1952                                 ect->dl = LABEL_SIZE - 44;
1953                         }
1954                         ccw[-1].flags |= CCW_FLAG_CC;
1955                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1956                         ccw->flags = CCW_FLAG_SLI;
1957                         ccw->count = 8;
1958                         ccw->cda = (__u32)(addr_t) ect;
1959                         ccw++;
1960                 }
1961         }
1962         fcp->startdev = device;
1963         fcp->memdev = device;
1964         fcp->retries = 256;
1965         fcp->buildclk = get_clock();
1966         fcp->status = DASD_CQR_FILLED;
1967         return fcp;
1968 }
1969
1970 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
1971 {
1972         cqr->status = DASD_CQR_FILLED;
1973         if (cqr->block && (cqr->startdev != cqr->block->base)) {
1974                 dasd_eckd_reset_ccw_to_base_io(cqr);
1975                 cqr->startdev = cqr->block->base;
1976                 cqr->lpm = cqr->block->base->path_data.opm;
1977         }
1978 };
1979
1980 static dasd_erp_fn_t
1981 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
1982 {
1983         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
1984         struct ccw_device *cdev = device->cdev;
1985
1986         switch (cdev->id.cu_type) {
1987         case 0x3990:
1988         case 0x2105:
1989         case 0x2107:
1990         case 0x1750:
1991                 return dasd_3990_erp_action;
1992         case 0x9343:
1993         case 0x3880:
1994         default:
1995                 return dasd_default_erp_action;
1996         }
1997 }
1998
1999 static dasd_erp_fn_t
2000 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2001 {
2002         return dasd_default_erp_postaction;
2003 }
2004
2005 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2006                                               struct dasd_ccw_req *cqr,
2007                                               struct irb *irb)
2008 {
2009         char mask;
2010         char *sense = NULL;
2011         struct dasd_eckd_private *private;
2012
2013         private = (struct dasd_eckd_private *) device->private;
2014         /* first of all check for state change pending interrupt */
2015         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2016         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2017                 /* for alias only and not in offline processing*/
2018                 if (!device->block && private->lcu &&
2019                     !test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
2020                         /*
2021                          * the state change could be caused by an alias
2022                          * reassignment remove device from alias handling
2023                          * to prevent new requests from being scheduled on
2024                          * the wrong alias device
2025                          */
2026                         dasd_alias_remove_device(device);
2027
2028                         /* schedule worker to reload device */
2029                         dasd_reload_device(device);
2030                 }
2031                 dasd_generic_handle_state_change(device);
2032                 return;
2033         }
2034
2035         sense = dasd_get_sense(irb);
2036         if (!sense)
2037                 return;
2038
2039         /* summary unit check */
2040         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2041             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2042                 dasd_alias_handle_summary_unit_check(device, irb);
2043                 return;
2044         }
2045
2046         /* service information message SIM */
2047         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
2048             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
2049                 dasd_3990_erp_handle_sim(device, sense);
2050                 return;
2051         }
2052
2053         /* loss of device reservation is handled via base devices only
2054          * as alias devices may be used with several bases
2055          */
2056         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
2057             (sense[7] == 0x3F) &&
2058             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
2059             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
2060                 if (device->features & DASD_FEATURE_FAILONSLCK)
2061                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
2062                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
2063                 dev_err(&device->cdev->dev,
2064                         "The device reservation was lost\n");
2065         }
2066 }
2067
2068 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
2069                                                struct dasd_device *startdev,
2070                                                struct dasd_block *block,
2071                                                struct request *req,
2072                                                sector_t first_rec,
2073                                                sector_t last_rec,
2074                                                sector_t first_trk,
2075                                                sector_t last_trk,
2076                                                unsigned int first_offs,
2077                                                unsigned int last_offs,
2078                                                unsigned int blk_per_trk,
2079                                                unsigned int blksize)
2080 {
2081         struct dasd_eckd_private *private;
2082         unsigned long *idaws;
2083         struct LO_eckd_data *LO_data;
2084         struct dasd_ccw_req *cqr;
2085         struct ccw1 *ccw;
2086         struct req_iterator iter;
2087         struct bio_vec *bv;
2088         char *dst;
2089         unsigned int off;
2090         int count, cidaw, cplength, datasize;
2091         sector_t recid;
2092         unsigned char cmd, rcmd;
2093         int use_prefix;
2094         struct dasd_device *basedev;
2095
2096         basedev = block->base;
2097         private = (struct dasd_eckd_private *) basedev->private;
2098         if (rq_data_dir(req) == READ)
2099                 cmd = DASD_ECKD_CCW_READ_MT;
2100         else if (rq_data_dir(req) == WRITE)
2101                 cmd = DASD_ECKD_CCW_WRITE_MT;
2102         else
2103                 return ERR_PTR(-EINVAL);
2104
2105         /* Check struct bio and count the number of blocks for the request. */
2106         count = 0;
2107         cidaw = 0;
2108         rq_for_each_segment(bv, req, iter) {
2109                 if (bv->bv_len & (blksize - 1))
2110                         /* Eckd can only do full blocks. */
2111                         return ERR_PTR(-EINVAL);
2112                 count += bv->bv_len >> (block->s2b_shift + 9);
2113 #if defined(CONFIG_64BIT)
2114                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
2115                         cidaw += bv->bv_len >> (block->s2b_shift + 9);
2116 #endif
2117         }
2118         /* Paranoia. */
2119         if (count != last_rec - first_rec + 1)
2120                 return ERR_PTR(-EINVAL);
2121
2122         /* use the prefix command if available */
2123         use_prefix = private->features.feature[8] & 0x01;
2124         if (use_prefix) {
2125                 /* 1x prefix + number of blocks */
2126                 cplength = 2 + count;
2127                 /* 1x prefix + cidaws*sizeof(long) */
2128                 datasize = sizeof(struct PFX_eckd_data) +
2129                         sizeof(struct LO_eckd_data) +
2130                         cidaw * sizeof(unsigned long);
2131         } else {
2132                 /* 1x define extent + 1x locate record + number of blocks */
2133                 cplength = 2 + count;
2134                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
2135                 datasize = sizeof(struct DE_eckd_data) +
2136                         sizeof(struct LO_eckd_data) +
2137                         cidaw * sizeof(unsigned long);
2138         }
2139         /* Find out the number of additional locate record ccws for cdl. */
2140         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
2141                 if (last_rec >= 2*blk_per_trk)
2142                         count = 2*blk_per_trk - first_rec;
2143                 cplength += count;
2144                 datasize += count*sizeof(struct LO_eckd_data);
2145         }
2146         /* Allocate the ccw request. */
2147         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2148                                    startdev);
2149         if (IS_ERR(cqr))
2150                 return cqr;
2151         ccw = cqr->cpaddr;
2152         /* First ccw is define extent or prefix. */
2153         if (use_prefix) {
2154                 if (prefix(ccw++, cqr->data, first_trk,
2155                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
2156                         /* Clock not in sync and XRC is enabled.
2157                          * Try again later.
2158                          */
2159                         dasd_sfree_request(cqr, startdev);
2160                         return ERR_PTR(-EAGAIN);
2161                 }
2162                 idaws = (unsigned long *) (cqr->data +
2163                                            sizeof(struct PFX_eckd_data));
2164         } else {
2165                 if (define_extent(ccw++, cqr->data, first_trk,
2166                                   last_trk, cmd, startdev) == -EAGAIN) {
2167                         /* Clock not in sync and XRC is enabled.
2168                          * Try again later.
2169                          */
2170                         dasd_sfree_request(cqr, startdev);
2171                         return ERR_PTR(-EAGAIN);
2172                 }
2173                 idaws = (unsigned long *) (cqr->data +
2174                                            sizeof(struct DE_eckd_data));
2175         }
2176         /* Build locate_record+read/write/ccws. */
2177         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
2178         recid = first_rec;
2179         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
2180                 /* Only standard blocks so there is just one locate record. */
2181                 ccw[-1].flags |= CCW_FLAG_CC;
2182                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
2183                               last_rec - recid + 1, cmd, basedev, blksize);
2184         }
2185         rq_for_each_segment(bv, req, iter) {
2186                 dst = page_address(bv->bv_page) + bv->bv_offset;
2187                 if (dasd_page_cache) {
2188                         char *copy = kmem_cache_alloc(dasd_page_cache,
2189                                                       GFP_DMA | __GFP_NOWARN);
2190                         if (copy && rq_data_dir(req) == WRITE)
2191                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
2192                         if (copy)
2193                                 dst = copy + bv->bv_offset;
2194                 }
2195                 for (off = 0; off < bv->bv_len; off += blksize) {
2196                         sector_t trkid = recid;
2197                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
2198                         rcmd = cmd;
2199                         count = blksize;
2200                         /* Locate record for cdl special block ? */
2201                         if (private->uses_cdl && recid < 2*blk_per_trk) {
2202                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
2203                                         rcmd |= 0x8;
2204                                         count = dasd_eckd_cdl_reclen(recid);
2205                                         if (count < blksize &&
2206                                             rq_data_dir(req) == READ)
2207                                                 memset(dst + count, 0xe5,
2208                                                        blksize - count);
2209                                 }
2210                                 ccw[-1].flags |= CCW_FLAG_CC;
2211                                 locate_record(ccw++, LO_data++,
2212                                               trkid, recoffs + 1,
2213                                               1, rcmd, basedev, count);
2214                         }
2215                         /* Locate record for standard blocks ? */
2216                         if (private->uses_cdl && recid == 2*blk_per_trk) {
2217                                 ccw[-1].flags |= CCW_FLAG_CC;
2218                                 locate_record(ccw++, LO_data++,
2219                                               trkid, recoffs + 1,
2220                                               last_rec - recid + 1,
2221                                               cmd, basedev, count);
2222                         }
2223                         /* Read/write ccw. */
2224                         ccw[-1].flags |= CCW_FLAG_CC;
2225                         ccw->cmd_code = rcmd;
2226                         ccw->count = count;
2227                         if (idal_is_needed(dst, blksize)) {
2228                                 ccw->cda = (__u32)(addr_t) idaws;
2229                                 ccw->flags = CCW_FLAG_IDA;
2230                                 idaws = idal_create_words(idaws, dst, blksize);
2231                         } else {
2232                                 ccw->cda = (__u32)(addr_t) dst;
2233                                 ccw->flags = 0;
2234                         }
2235                         ccw++;
2236                         dst += blksize;
2237                         recid++;
2238                 }
2239         }
2240         if (blk_noretry_request(req) ||
2241             block->base->features & DASD_FEATURE_FAILFAST)
2242                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2243         cqr->startdev = startdev;
2244         cqr->memdev = startdev;
2245         cqr->block = block;
2246         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2247         cqr->lpm = startdev->path_data.ppm;
2248         cqr->retries = 256;
2249         cqr->buildclk = get_clock();
2250         cqr->status = DASD_CQR_FILLED;
2251         return cqr;
2252 }
2253
2254 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
2255                                                struct dasd_device *startdev,
2256                                                struct dasd_block *block,
2257                                                struct request *req,
2258                                                sector_t first_rec,
2259                                                sector_t last_rec,
2260                                                sector_t first_trk,
2261                                                sector_t last_trk,
2262                                                unsigned int first_offs,
2263                                                unsigned int last_offs,
2264                                                unsigned int blk_per_trk,
2265                                                unsigned int blksize)
2266 {
2267         struct dasd_eckd_private *private;
2268         unsigned long *idaws;
2269         struct dasd_ccw_req *cqr;
2270         struct ccw1 *ccw;
2271         struct req_iterator iter;
2272         struct bio_vec *bv;
2273         char *dst, *idaw_dst;
2274         unsigned int cidaw, cplength, datasize;
2275         unsigned int tlf;
2276         sector_t recid;
2277         unsigned char cmd;
2278         struct dasd_device *basedev;
2279         unsigned int trkcount, count, count_to_trk_end;
2280         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
2281         unsigned char new_track, end_idaw;
2282         sector_t trkid;
2283         unsigned int recoffs;
2284
2285         basedev = block->base;
2286         private = (struct dasd_eckd_private *) basedev->private;
2287         if (rq_data_dir(req) == READ)
2288                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2289         else if (rq_data_dir(req) == WRITE)
2290                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2291         else
2292                 return ERR_PTR(-EINVAL);
2293
2294         /* Track based I/O needs IDAWs for each page, and not just for
2295          * 64 bit addresses. We need additional idals for pages
2296          * that get filled from two tracks, so we use the number
2297          * of records as upper limit.
2298          */
2299         cidaw = last_rec - first_rec + 1;
2300         trkcount = last_trk - first_trk + 1;
2301
2302         /* 1x prefix + one read/write ccw per track */
2303         cplength = 1 + trkcount;
2304
2305         /* on 31-bit we need space for two 32 bit addresses per page
2306          * on 64-bit one 64 bit address
2307          */
2308         datasize = sizeof(struct PFX_eckd_data) +
2309                 cidaw * sizeof(unsigned long long);
2310
2311         /* Allocate the ccw request. */
2312         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2313                                    startdev);
2314         if (IS_ERR(cqr))
2315                 return cqr;
2316         ccw = cqr->cpaddr;
2317         /* transfer length factor: how many bytes to read from the last track */
2318         if (first_trk == last_trk)
2319                 tlf = last_offs - first_offs + 1;
2320         else
2321                 tlf = last_offs + 1;
2322         tlf *= blksize;
2323
2324         if (prefix_LRE(ccw++, cqr->data, first_trk,
2325                        last_trk, cmd, basedev, startdev,
2326                        1 /* format */, first_offs + 1,
2327                        trkcount, blksize,
2328                        tlf) == -EAGAIN) {
2329                 /* Clock not in sync and XRC is enabled.
2330                  * Try again later.
2331                  */
2332                 dasd_sfree_request(cqr, startdev);
2333                 return ERR_PTR(-EAGAIN);
2334         }
2335
2336         /*
2337          * The translation of request into ccw programs must meet the
2338          * following conditions:
2339          * - all idaws but the first and the last must address full pages
2340          *   (or 2K blocks on 31-bit)
2341          * - the scope of a ccw and it's idal ends with the track boundaries
2342          */
2343         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2344         recid = first_rec;
2345         new_track = 1;
2346         end_idaw = 0;
2347         len_to_track_end = 0;
2348         idaw_dst = 0;
2349         idaw_len = 0;
2350         rq_for_each_segment(bv, req, iter) {
2351                 dst = page_address(bv->bv_page) + bv->bv_offset;
2352                 seg_len = bv->bv_len;
2353                 while (seg_len) {
2354                         if (new_track) {
2355                                 trkid = recid;
2356                                 recoffs = sector_div(trkid, blk_per_trk);
2357                                 count_to_trk_end = blk_per_trk - recoffs;
2358                                 count = min((last_rec - recid + 1),
2359                                             (sector_t)count_to_trk_end);
2360                                 len_to_track_end = count * blksize;
2361                                 ccw[-1].flags |= CCW_FLAG_CC;
2362                                 ccw->cmd_code = cmd;
2363                                 ccw->count = len_to_track_end;
2364                                 ccw->cda = (__u32)(addr_t)idaws;
2365                                 ccw->flags = CCW_FLAG_IDA;
2366                                 ccw++;
2367                                 recid += count;
2368                                 new_track = 0;
2369                                 /* first idaw for a ccw may start anywhere */
2370                                 if (!idaw_dst)
2371                                         idaw_dst = dst;
2372                         }
2373                         /* If we start a new idaw, we must make sure that it
2374                          * starts on an IDA_BLOCK_SIZE boundary.
2375                          * If we continue an idaw, we must make sure that the
2376                          * current segment begins where the so far accumulated
2377                          * idaw ends
2378                          */
2379                         if (!idaw_dst) {
2380                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2381                                         dasd_sfree_request(cqr, startdev);
2382                                         return ERR_PTR(-ERANGE);
2383                                 } else
2384                                         idaw_dst = dst;
2385                         }
2386                         if ((idaw_dst + idaw_len) != dst) {
2387                                 dasd_sfree_request(cqr, startdev);
2388                                 return ERR_PTR(-ERANGE);
2389                         }
2390                         part_len = min(seg_len, len_to_track_end);
2391                         seg_len -= part_len;
2392                         dst += part_len;
2393                         idaw_len += part_len;
2394                         len_to_track_end -= part_len;
2395                         /* collected memory area ends on an IDA_BLOCK border,
2396                          * -> create an idaw
2397                          * idal_create_words will handle cases where idaw_len
2398                          * is larger then IDA_BLOCK_SIZE
2399                          */
2400                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2401                                 end_idaw = 1;
2402                         /* We also need to end the idaw at track end */
2403                         if (!len_to_track_end) {
2404                                 new_track = 1;
2405                                 end_idaw = 1;
2406                         }
2407                         if (end_idaw) {
2408                                 idaws = idal_create_words(idaws, idaw_dst,
2409                                                           idaw_len);
2410                                 idaw_dst = 0;
2411                                 idaw_len = 0;
2412                                 end_idaw = 0;
2413                         }
2414                 }
2415         }
2416
2417         if (blk_noretry_request(req) ||
2418             block->base->features & DASD_FEATURE_FAILFAST)
2419                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2420         cqr->startdev = startdev;
2421         cqr->memdev = startdev;
2422         cqr->block = block;
2423         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2424         cqr->lpm = startdev->path_data.ppm;
2425         cqr->retries = 256;
2426         cqr->buildclk = get_clock();
2427         cqr->status = DASD_CQR_FILLED;
2428         return cqr;
2429 }
2430
2431 static int prepare_itcw(struct itcw *itcw,
2432                         unsigned int trk, unsigned int totrk, int cmd,
2433                         struct dasd_device *basedev,
2434                         struct dasd_device *startdev,
2435                         unsigned int rec_on_trk, int count,
2436                         unsigned int blksize,
2437                         unsigned int total_data_size,
2438                         unsigned int tlf,
2439                         unsigned int blk_per_trk)
2440 {
2441         struct PFX_eckd_data pfxdata;
2442         struct dasd_eckd_private *basepriv, *startpriv;
2443         struct DE_eckd_data *dedata;
2444         struct LRE_eckd_data *lredata;
2445         struct dcw *dcw;
2446
2447         u32 begcyl, endcyl;
2448         u16 heads, beghead, endhead;
2449         u8 pfx_cmd;
2450
2451         int rc = 0;
2452         int sector = 0;
2453         int dn, d;
2454
2455
2456         /* setup prefix data */
2457         basepriv = (struct dasd_eckd_private *) basedev->private;
2458         startpriv = (struct dasd_eckd_private *) startdev->private;
2459         dedata = &pfxdata.define_extent;
2460         lredata = &pfxdata.locate_record;
2461
2462         memset(&pfxdata, 0, sizeof(pfxdata));
2463         pfxdata.format = 1; /* PFX with LRE */
2464         pfxdata.base_address = basepriv->ned->unit_addr;
2465         pfxdata.base_lss = basepriv->ned->ID;
2466         pfxdata.validity.define_extent = 1;
2467
2468         /* private uid is kept up to date, conf_data may be outdated */
2469         if (startpriv->uid.type != UA_BASE_DEVICE) {
2470                 pfxdata.validity.verify_base = 1;
2471                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2472                         pfxdata.validity.hyper_pav = 1;
2473         }
2474
2475         switch (cmd) {
2476         case DASD_ECKD_CCW_READ_TRACK_DATA:
2477                 dedata->mask.perm = 0x1;
2478                 dedata->attributes.operation = basepriv->attrib.operation;
2479                 dedata->blk_size = blksize;
2480                 dedata->ga_extended |= 0x42;
2481                 lredata->operation.orientation = 0x0;
2482                 lredata->operation.operation = 0x0C;
2483                 lredata->auxiliary.check_bytes = 0x01;
2484                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2485                 break;
2486         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2487                 dedata->mask.perm = 0x02;
2488                 dedata->attributes.operation = basepriv->attrib.operation;
2489                 dedata->blk_size = blksize;
2490                 rc = check_XRC_on_prefix(&pfxdata, basedev);
2491                 dedata->ga_extended |= 0x42;
2492                 lredata->operation.orientation = 0x0;
2493                 lredata->operation.operation = 0x3F;
2494                 lredata->extended_operation = 0x23;
2495                 lredata->auxiliary.check_bytes = 0x2;
2496                 pfx_cmd = DASD_ECKD_CCW_PFX;
2497                 break;
2498         default:
2499                 DBF_DEV_EVENT(DBF_ERR, basedev,
2500                               "prepare itcw, unknown opcode 0x%x", cmd);
2501                 BUG();
2502                 break;
2503         }
2504         if (rc)
2505                 return rc;
2506
2507         dedata->attributes.mode = 0x3;  /* ECKD */
2508
2509         heads = basepriv->rdc_data.trk_per_cyl;
2510         begcyl = trk / heads;
2511         beghead = trk % heads;
2512         endcyl = totrk / heads;
2513         endhead = totrk % heads;
2514
2515         /* check for sequential prestage - enhance cylinder range */
2516         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2517             dedata->attributes.operation == DASD_SEQ_ACCESS) {
2518
2519                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2520                         endcyl += basepriv->attrib.nr_cyl;
2521                 else
2522                         endcyl = (basepriv->real_cyl - 1);
2523         }
2524
2525         set_ch_t(&dedata->beg_ext, begcyl, beghead);
2526         set_ch_t(&dedata->end_ext, endcyl, endhead);
2527
2528         dedata->ep_format = 0x20; /* records per track is valid */
2529         dedata->ep_rec_per_track = blk_per_trk;
2530
2531         if (rec_on_trk) {
2532                 switch (basepriv->rdc_data.dev_type) {
2533                 case 0x3390:
2534                         dn = ceil_quot(blksize + 6, 232);
2535                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
2536                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
2537                         break;
2538                 case 0x3380:
2539                         d = 7 + ceil_quot(blksize + 12, 32);
2540                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
2541                         break;
2542                 }
2543         }
2544
2545         lredata->auxiliary.length_valid = 1;
2546         lredata->auxiliary.length_scope = 1;
2547         lredata->auxiliary.imbedded_ccw_valid = 1;
2548         lredata->length = tlf;
2549         lredata->imbedded_ccw = cmd;
2550         lredata->count = count;
2551         lredata->sector = sector;
2552         set_ch_t(&lredata->seek_addr, begcyl, beghead);
2553         lredata->search_arg.cyl = lredata->seek_addr.cyl;
2554         lredata->search_arg.head = lredata->seek_addr.head;
2555         lredata->search_arg.record = rec_on_trk;
2556
2557         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
2558                      &pfxdata, sizeof(pfxdata), total_data_size);
2559
2560         return rc;
2561 }
2562
2563 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
2564                                                struct dasd_device *startdev,
2565                                                struct dasd_block *block,
2566                                                struct request *req,
2567                                                sector_t first_rec,
2568                                                sector_t last_rec,
2569                                                sector_t first_trk,
2570                                                sector_t last_trk,
2571                                                unsigned int first_offs,
2572                                                unsigned int last_offs,
2573                                                unsigned int blk_per_trk,
2574                                                unsigned int blksize)
2575 {
2576         struct dasd_eckd_private *private;
2577         struct dasd_ccw_req *cqr;
2578         struct req_iterator iter;
2579         struct bio_vec *bv;
2580         char *dst;
2581         unsigned int trkcount, ctidaw;
2582         unsigned char cmd;
2583         struct dasd_device *basedev;
2584         unsigned int tlf;
2585         struct itcw *itcw;
2586         struct tidaw *last_tidaw = NULL;
2587         int itcw_op;
2588         size_t itcw_size;
2589         u8 tidaw_flags;
2590         unsigned int seg_len, part_len, len_to_track_end;
2591         unsigned char new_track;
2592         sector_t recid, trkid;
2593         unsigned int offs;
2594         unsigned int count, count_to_trk_end;
2595
2596         basedev = block->base;
2597         private = (struct dasd_eckd_private *) basedev->private;
2598         if (rq_data_dir(req) == READ) {
2599                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2600                 itcw_op = ITCW_OP_READ;
2601         } else if (rq_data_dir(req) == WRITE) {
2602                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2603                 itcw_op = ITCW_OP_WRITE;
2604         } else
2605                 return ERR_PTR(-EINVAL);
2606
2607         /* trackbased I/O needs address all memory via TIDAWs,
2608          * not just for 64 bit addresses. This allows us to map
2609          * each segment directly to one tidaw.
2610          * In the case of write requests, additional tidaws may
2611          * be needed when a segment crosses a track boundary.
2612          */
2613         trkcount = last_trk - first_trk + 1;
2614         ctidaw = 0;
2615         rq_for_each_segment(bv, req, iter) {
2616                 ++ctidaw;
2617         }
2618         if (rq_data_dir(req) == WRITE)
2619                 ctidaw += (last_trk - first_trk);
2620
2621         /* Allocate the ccw request. */
2622         itcw_size = itcw_calc_size(0, ctidaw, 0);
2623         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2624         if (IS_ERR(cqr))
2625                 return cqr;
2626
2627         /* transfer length factor: how many bytes to read from the last track */
2628         if (first_trk == last_trk)
2629                 tlf = last_offs - first_offs + 1;
2630         else
2631                 tlf = last_offs + 1;
2632         tlf *= blksize;
2633
2634         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
2635         if (IS_ERR(itcw)) {
2636                 dasd_sfree_request(cqr, startdev);
2637                 return ERR_PTR(-EINVAL);
2638         }
2639         cqr->cpaddr = itcw_get_tcw(itcw);
2640         if (prepare_itcw(itcw, first_trk, last_trk,
2641                          cmd, basedev, startdev,
2642                          first_offs + 1,
2643                          trkcount, blksize,
2644                          (last_rec - first_rec + 1) * blksize,
2645                          tlf, blk_per_trk) == -EAGAIN) {
2646                 /* Clock not in sync and XRC is enabled.
2647                  * Try again later.
2648                  */
2649                 dasd_sfree_request(cqr, startdev);
2650                 return ERR_PTR(-EAGAIN);
2651         }
2652         len_to_track_end = 0;
2653         /*
2654          * A tidaw can address 4k of memory, but must not cross page boundaries
2655          * We can let the block layer handle this by setting
2656          * blk_queue_segment_boundary to page boundaries and
2657          * blk_max_segment_size to page size when setting up the request queue.
2658          * For write requests, a TIDAW must not cross track boundaries, because
2659          * we have to set the CBC flag on the last tidaw for each track.
2660          */
2661         if (rq_data_dir(req) == WRITE) {
2662                 new_track = 1;
2663                 recid = first_rec;
2664                 rq_for_each_segment(bv, req, iter) {
2665                         dst = page_address(bv->bv_page) + bv->bv_offset;
2666                         seg_len = bv->bv_len;
2667                         while (seg_len) {
2668                                 if (new_track) {
2669                                         trkid = recid;
2670                                         offs = sector_div(trkid, blk_per_trk);
2671                                         count_to_trk_end = blk_per_trk - offs;
2672                                         count = min((last_rec - recid + 1),
2673                                                     (sector_t)count_to_trk_end);
2674                                         len_to_track_end = count * blksize;
2675                                         recid += count;
2676                                         new_track = 0;
2677                                 }
2678                                 part_len = min(seg_len, len_to_track_end);
2679                                 seg_len -= part_len;
2680                                 len_to_track_end -= part_len;
2681                                 /* We need to end the tidaw at track end */
2682                                 if (!len_to_track_end) {
2683                                         new_track = 1;
2684                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
2685                                 } else
2686                                         tidaw_flags = 0;
2687                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
2688                                                             dst, part_len);
2689                                 if (IS_ERR(last_tidaw))
2690                                         return ERR_PTR(-EINVAL);
2691                                 dst += part_len;
2692                         }
2693                 }
2694         } else {
2695                 rq_for_each_segment(bv, req, iter) {
2696                         dst = page_address(bv->bv_page) + bv->bv_offset;
2697                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
2698                                                     dst, bv->bv_len);
2699                         if (IS_ERR(last_tidaw))
2700                                 return ERR_PTR(-EINVAL);
2701                 }
2702         }
2703         last_tidaw->flags |= TIDAW_FLAGS_LAST;
2704         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
2705         itcw_finalize(itcw);
2706
2707         if (blk_noretry_request(req) ||
2708             block->base->features & DASD_FEATURE_FAILFAST)
2709                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2710         cqr->cpmode = 1;
2711         cqr->startdev = startdev;
2712         cqr->memdev = startdev;
2713         cqr->block = block;
2714         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2715         cqr->lpm = startdev->path_data.ppm;
2716         cqr->retries = 256;
2717         cqr->buildclk = get_clock();
2718         cqr->status = DASD_CQR_FILLED;
2719         return cqr;
2720 }
2721
2722 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
2723                                                struct dasd_block *block,
2724                                                struct request *req)
2725 {
2726         int cmdrtd, cmdwtd;
2727         int use_prefix;
2728         int fcx_multitrack;
2729         struct dasd_eckd_private *private;
2730         struct dasd_device *basedev;
2731         sector_t first_rec, last_rec;
2732         sector_t first_trk, last_trk;
2733         unsigned int first_offs, last_offs;
2734         unsigned int blk_per_trk, blksize;
2735         int cdlspecial;
2736         unsigned int data_size;
2737         struct dasd_ccw_req *cqr;
2738
2739         basedev = block->base;
2740         private = (struct dasd_eckd_private *) basedev->private;
2741
2742         /* Calculate number of blocks/records per track. */
2743         blksize = block->bp_block;
2744         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2745         if (blk_per_trk == 0)
2746                 return ERR_PTR(-EINVAL);
2747         /* Calculate record id of first and last block. */
2748         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
2749         first_offs = sector_div(first_trk, blk_per_trk);
2750         last_rec = last_trk =
2751                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
2752         last_offs = sector_div(last_trk, blk_per_trk);
2753         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
2754
2755         fcx_multitrack = private->features.feature[40] & 0x20;
2756         data_size = blk_rq_bytes(req);
2757         /* tpm write request add CBC data on each track boundary */
2758         if (rq_data_dir(req) == WRITE)
2759                 data_size += (last_trk - first_trk) * 4;
2760
2761         /* is read track data and write track data in command mode supported? */
2762         cmdrtd = private->features.feature[9] & 0x20;
2763         cmdwtd = private->features.feature[12] & 0x40;
2764         use_prefix = private->features.feature[8] & 0x01;
2765
2766         cqr = NULL;
2767         if (cdlspecial || dasd_page_cache) {
2768                 /* do nothing, just fall through to the cmd mode single case */
2769         } else if ((data_size <= private->fcx_max_data)
2770                    && (fcx_multitrack || (first_trk == last_trk))) {
2771                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
2772                                                     first_rec, last_rec,
2773                                                     first_trk, last_trk,
2774                                                     first_offs, last_offs,
2775                                                     blk_per_trk, blksize);
2776                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
2777                     (PTR_ERR(cqr) != -ENOMEM))
2778                         cqr = NULL;
2779         } else if (use_prefix &&
2780                    (((rq_data_dir(req) == READ) && cmdrtd) ||
2781                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
2782                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
2783                                                    first_rec, last_rec,
2784                                                    first_trk, last_trk,
2785                                                    first_offs, last_offs,
2786                                                    blk_per_trk, blksize);
2787                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
2788                     (PTR_ERR(cqr) != -ENOMEM))
2789                         cqr = NULL;
2790         }
2791         if (!cqr)
2792                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
2793                                                     first_rec, last_rec,
2794                                                     first_trk, last_trk,
2795                                                     first_offs, last_offs,
2796                                                     blk_per_trk, blksize);
2797         return cqr;
2798 }
2799
2800 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
2801                                                struct dasd_block *block,
2802                                                struct request *req)
2803 {
2804         struct dasd_eckd_private *private;
2805         unsigned long *idaws;
2806         struct dasd_device *basedev;
2807         struct dasd_ccw_req *cqr;
2808         struct ccw1 *ccw;
2809         struct req_iterator iter;
2810         struct bio_vec *bv;
2811         char *dst;
2812         unsigned char cmd;
2813         unsigned int trkcount;
2814         unsigned int seg_len, len_to_track_end;
2815         unsigned int first_offs;
2816         unsigned int cidaw, cplength, datasize;
2817         sector_t first_trk, last_trk;
2818         unsigned int pfx_datasize;
2819
2820         /*
2821          * raw track access needs to be mutiple of 64k and on 64k boundary
2822          */
2823         if ((blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK) != 0) {
2824                 cqr = ERR_PTR(-EINVAL);
2825                 goto out;
2826         }
2827         if (((blk_rq_pos(req) + blk_rq_sectors(req)) %
2828              DASD_RAW_SECTORS_PER_TRACK) != 0) {
2829                 cqr = ERR_PTR(-EINVAL);
2830                 goto out;
2831         }
2832
2833         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
2834         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
2835                 DASD_RAW_SECTORS_PER_TRACK;
2836         trkcount = last_trk - first_trk + 1;
2837         first_offs = 0;
2838         basedev = block->base;
2839         private = (struct dasd_eckd_private *) basedev->private;
2840
2841         if (rq_data_dir(req) == READ)
2842                 cmd = DASD_ECKD_CCW_READ_TRACK;
2843         else if (rq_data_dir(req) == WRITE)
2844                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
2845         else {
2846                 cqr = ERR_PTR(-EINVAL);
2847                 goto out;
2848         }
2849
2850         /*
2851          * Raw track based I/O needs IDAWs for each page,
2852          * and not just for 64 bit addresses.
2853          */
2854         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
2855
2856         /* 1x prefix + one read/write ccw per track */
2857         cplength = 1 + trkcount;
2858
2859         /*
2860          * struct PFX_eckd_data has up to 2 byte as extended parameter
2861          * this is needed for write full track and has to be mentioned
2862          * separately
2863          * add 8 instead of 2 to keep 8 byte boundary
2864          */
2865         pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
2866
2867         datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
2868
2869         /* Allocate the ccw request. */
2870         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
2871                                    datasize, startdev);
2872         if (IS_ERR(cqr))
2873                 goto out;
2874         ccw = cqr->cpaddr;
2875
2876         if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
2877                        basedev, startdev, 1 /* format */, first_offs + 1,
2878                        trkcount, 0, 0) == -EAGAIN) {
2879                 /* Clock not in sync and XRC is enabled.
2880                  * Try again later.
2881                  */
2882                 dasd_sfree_request(cqr, startdev);
2883                 cqr = ERR_PTR(-EAGAIN);
2884                 goto out;
2885         }
2886
2887         idaws = (unsigned long *)(cqr->data + pfx_datasize);
2888
2889         len_to_track_end = 0;
2890
2891         rq_for_each_segment(bv, req, iter) {
2892                 dst = page_address(bv->bv_page) + bv->bv_offset;
2893                 seg_len = bv->bv_len;
2894                 if (!len_to_track_end) {
2895                         ccw[-1].flags |= CCW_FLAG_CC;
2896                         ccw->cmd_code = cmd;
2897                         /* maximum 3390 track size */
2898                         ccw->count = 57326;
2899                         /* 64k map to one track */
2900                         len_to_track_end = 65536;
2901                         ccw->cda = (__u32)(addr_t)idaws;
2902                         ccw->flags |= CCW_FLAG_IDA;
2903                         ccw->flags |= CCW_FLAG_SLI;
2904                         ccw++;
2905                 }
2906                 len_to_track_end -= seg_len;
2907                 idaws = idal_create_words(idaws, dst, seg_len);
2908         }
2909
2910         if (blk_noretry_request(req) ||
2911             block->base->features & DASD_FEATURE_FAILFAST)
2912                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2913         cqr->startdev = startdev;
2914         cqr->memdev = startdev;
2915         cqr->block = block;
2916         cqr->expires = startdev->default_expires * HZ;
2917         cqr->lpm = startdev->path_data.ppm;
2918         cqr->retries = 256;
2919         cqr->buildclk = get_clock();
2920         cqr->status = DASD_CQR_FILLED;
2921
2922         if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
2923                 cqr = NULL;
2924 out:
2925         return cqr;
2926 }
2927
2928
2929 static int
2930 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
2931 {
2932         struct dasd_eckd_private *private;
2933         struct ccw1 *ccw;
2934         struct req_iterator iter;
2935         struct bio_vec *bv;
2936         char *dst, *cda;
2937         unsigned int blksize, blk_per_trk, off;
2938         sector_t recid;
2939         int status;
2940
2941         if (!dasd_page_cache)
2942                 goto out;
2943         private = (struct dasd_eckd_private *) cqr->block->base->private;
2944         blksize = cqr->block->bp_block;
2945         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2946         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
2947         ccw = cqr->cpaddr;
2948         /* Skip over define extent & locate record. */
2949         ccw++;
2950         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
2951                 ccw++;
2952         rq_for_each_segment(bv, req, iter) {
2953                 dst = page_address(bv->bv_page) + bv->bv_offset;
2954                 for (off = 0; off < bv->bv_len; off += blksize) {
2955                         /* Skip locate record. */
2956                         if (private->uses_cdl && recid <= 2*blk_per_trk)
2957                                 ccw++;
2958                         if (dst) {
2959                                 if (ccw->flags & CCW_FLAG_IDA)
2960                                         cda = *((char **)((addr_t) ccw->cda));
2961                                 else
2962                                         cda = (char *)((addr_t) ccw->cda);
2963                                 if (dst != cda) {
2964                                         if (rq_data_dir(req) == READ)
2965                                                 memcpy(dst, cda, bv->bv_len);
2966                                         kmem_cache_free(dasd_page_cache,
2967                                             (void *)((addr_t)cda & PAGE_MASK));
2968                                 }
2969                                 dst = NULL;
2970                         }
2971                         ccw++;
2972                         recid++;
2973                 }
2974         }
2975 out:
2976         status = cqr->status == DASD_CQR_DONE;
2977         dasd_sfree_request(cqr, cqr->memdev);
2978         return status;
2979 }
2980
2981 /*
2982  * Modify ccw/tcw in cqr so it can be started on a base device.
2983  *
2984  * Note that this is not enough to restart the cqr!
2985  * Either reset cqr->startdev as well (summary unit check handling)
2986  * or restart via separate cqr (as in ERP handling).
2987  */
2988 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
2989 {
2990         struct ccw1 *ccw;
2991         struct PFX_eckd_data *pfxdata;
2992         struct tcw *tcw;
2993         struct tccb *tccb;
2994         struct dcw *dcw;
2995
2996         if (cqr->cpmode == 1) {
2997                 tcw = cqr->cpaddr;
2998                 tccb = tcw_get_tccb(tcw);
2999                 dcw = (struct dcw *)&tccb->tca[0];
3000                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
3001                 pfxdata->validity.verify_base = 0;
3002                 pfxdata->validity.hyper_pav = 0;
3003         } else {
3004                 ccw = cqr->cpaddr;
3005                 pfxdata = cqr->data;
3006                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
3007                         pfxdata->validity.verify_base = 0;
3008                         pfxdata->validity.hyper_pav = 0;
3009                 }
3010         }
3011 }
3012
3013 #define DASD_ECKD_CHANQ_MAX_SIZE 4
3014
3015 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
3016                                                      struct dasd_block *block,
3017                                                      struct request *req)
3018 {
3019         struct dasd_eckd_private *private;
3020         struct dasd_device *startdev;
3021         unsigned long flags;
3022         struct dasd_ccw_req *cqr;
3023
3024         startdev = dasd_alias_get_start_dev(base);
3025         if (!startdev)
3026                 startdev = base;
3027         private = (struct dasd_eckd_private *) startdev->private;
3028         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
3029                 return ERR_PTR(-EBUSY);
3030
3031         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
3032         private->count++;
3033         if ((base->features & DASD_FEATURE_USERAW))
3034                 cqr = dasd_raw_build_cp(startdev, block, req);
3035         else
3036                 cqr = dasd_eckd_build_cp(startdev, block, req);
3037         if (IS_ERR(cqr))
3038                 private->count--;
3039         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
3040         return cqr;
3041 }
3042
3043 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
3044                                    struct request *req)
3045 {
3046         struct dasd_eckd_private *private;
3047         unsigned long flags;
3048
3049         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
3050         private = (struct dasd_eckd_private *) cqr->memdev->private;
3051         private->count--;
3052         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
3053         return dasd_eckd_free_cp(cqr, req);
3054 }
3055
3056 static int
3057 dasd_eckd_fill_info(struct dasd_device * device,
3058                     struct dasd_information2_t * info)
3059 {
3060         struct dasd_eckd_private *private;
3061
3062         private = (struct dasd_eckd_private *) device->private;
3063         info->label_block = 2;
3064         info->FBA_layout = private->uses_cdl ? 0 : 1;
3065         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
3066         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
3067         memcpy(info->characteristics, &private->rdc_data,
3068                sizeof(struct dasd_eckd_characteristics));
3069         info->confdata_size = min((unsigned long)private->conf_len,
3070                                   sizeof(info->configuration_data));
3071         memcpy(info->configuration_data, private->conf_data,
3072                info->confdata_size);
3073         return 0;
3074 }
3075
3076 /*
3077  * SECTION: ioctl functions for eckd devices.
3078  */
3079
3080 /*
3081  * Release device ioctl.
3082  * Buils a channel programm to releases a prior reserved
3083  * (see dasd_eckd_reserve) device.
3084  */
3085 static int
3086 dasd_eckd_release(struct dasd_device *device)
3087 {
3088         struct dasd_ccw_req *cqr;
3089         int rc;
3090         struct ccw1 *ccw;
3091         int useglobal;
3092
3093         if (!capable(CAP_SYS_ADMIN))
3094                 return -EACCES;
3095
3096         useglobal = 0;
3097         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3098         if (IS_ERR(cqr)) {
3099                 mutex_lock(&dasd_reserve_mutex);
3100                 useglobal = 1;
3101                 cqr = &dasd_reserve_req->cqr;
3102                 memset(cqr, 0, sizeof(*cqr));
3103                 memset(&dasd_reserve_req->ccw, 0,
3104                        sizeof(dasd_reserve_req->ccw));
3105                 cqr->cpaddr = &dasd_reserve_req->ccw;
3106                 cqr->data = &dasd_reserve_req->data;
3107                 cqr->magic = DASD_ECKD_MAGIC;
3108         }
3109         ccw = cqr->cpaddr;
3110         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
3111         ccw->flags |= CCW_FLAG_SLI;
3112         ccw->count = 32;
3113         ccw->cda = (__u32)(addr_t) cqr->data;
3114         cqr->startdev = device;
3115         cqr->memdev = device;
3116         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3117         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3118         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3119         cqr->expires = 2 * HZ;
3120         cqr->buildclk = get_clock();
3121         cqr->status = DASD_CQR_FILLED;
3122
3123         rc = dasd_sleep_on_immediatly(cqr);
3124         if (!rc)
3125                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3126
3127         if (useglobal)
3128                 mutex_unlock(&dasd_reserve_mutex);
3129         else
3130                 dasd_sfree_request(cqr, cqr->memdev);
3131         return rc;
3132 }
3133
3134 /*
3135  * Reserve device ioctl.
3136  * Options are set to 'synchronous wait for interrupt' and
3137  * 'timeout the request'. This leads to a terminate IO if
3138  * the interrupt is outstanding for a certain time.
3139  */
3140 static int
3141 dasd_eckd_reserve(struct dasd_device *device)
3142 {
3143         struct dasd_ccw_req *cqr;
3144         int rc;
3145         struct ccw1 *ccw;
3146         int useglobal;
3147
3148         if (!capable(CAP_SYS_ADMIN))
3149                 return -EACCES;
3150
3151         useglobal = 0;
3152         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3153         if (IS_ERR(cqr)) {
3154                 mutex_lock(&dasd_reserve_mutex);
3155                 useglobal = 1;
3156                 cqr = &dasd_reserve_req->cqr;
3157                 memset(cqr, 0, sizeof(*cqr));
3158                 memset(&dasd_reserve_req->ccw, 0,
3159                        sizeof(dasd_reserve_req->ccw));
3160                 cqr->cpaddr = &dasd_reserve_req->ccw;
3161                 cqr->data = &dasd_reserve_req->data;
3162                 cqr->magic = DASD_ECKD_MAGIC;
3163         }
3164         ccw = cqr->cpaddr;
3165         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
3166         ccw->flags |= CCW_FLAG_SLI;
3167         ccw->count = 32;
3168         ccw->cda = (__u32)(addr_t) cqr->data;
3169         cqr->startdev = device;
3170         cqr->memdev = device;
3171         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3172         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3173         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3174         cqr->expires = 2 * HZ;
3175         cqr->buildclk = get_clock();
3176         cqr->status = DASD_CQR_FILLED;
3177
3178         rc = dasd_sleep_on_immediatly(cqr);
3179         if (!rc)
3180                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3181
3182         if (useglobal)
3183                 mutex_unlock(&dasd_reserve_mutex);
3184         else
3185                 dasd_sfree_request(cqr, cqr->memdev);
3186         return rc;
3187 }
3188
3189 /*
3190  * Steal lock ioctl - unconditional reserve device.
3191  * Buils a channel programm to break a device's reservation.
3192  * (unconditional reserve)
3193  */
3194 static int
3195 dasd_eckd_steal_lock(struct dasd_device *device)
3196 {
3197         struct dasd_ccw_req *cqr;
3198         int rc;
3199         struct ccw1 *ccw;
3200         int useglobal;
3201
3202         if (!capable(CAP_SYS_ADMIN))
3203                 return -EACCES;
3204
3205         useglobal = 0;
3206         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3207         if (IS_ERR(cqr)) {
3208                 mutex_lock(&dasd_reserve_mutex);
3209                 useglobal = 1;
3210                 cqr = &dasd_reserve_req->cqr;
3211                 memset(cqr, 0, sizeof(*cqr));
3212                 memset(&dasd_reserve_req->ccw, 0,
3213                        sizeof(dasd_reserve_req->ccw));
3214                 cqr->cpaddr = &dasd_reserve_req->ccw;
3215                 cqr->data = &dasd_reserve_req->data;
3216                 cqr->magic = DASD_ECKD_MAGIC;
3217         }
3218         ccw = cqr->cpaddr;
3219         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
3220         ccw->flags |= CCW_FLAG_SLI;
3221         ccw->count = 32;
3222         ccw->cda = (__u32)(addr_t) cqr->data;
3223         cqr->startdev = device;
3224         cqr->memdev = device;
3225         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3226         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3227         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3228         cqr->expires = 2 * HZ;
3229         cqr->buildclk = get_clock();
3230         cqr->status = DASD_CQR_FILLED;
3231
3232         rc = dasd_sleep_on_immediatly(cqr);
3233         if (!rc)
3234                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3235
3236         if (useglobal)
3237                 mutex_unlock(&dasd_reserve_mutex);
3238         else
3239                 dasd_sfree_request(cqr, cqr->memdev);
3240         return rc;
3241 }
3242
3243 /*
3244  * SNID - Sense Path Group ID
3245  * This ioctl may be used in situations where I/O is stalled due to
3246  * a reserve, so if the normal dasd_smalloc_request fails, we use the
3247  * preallocated dasd_reserve_req.
3248  */
3249 static int dasd_eckd_snid(struct dasd_device *device,
3250                           void __user *argp)
3251 {
3252         struct dasd_ccw_req *cqr;
3253         int rc;
3254         struct ccw1 *ccw;
3255         int useglobal;
3256         struct dasd_snid_ioctl_data usrparm;
3257
3258         if (!capable(CAP_SYS_ADMIN))
3259                 return -EACCES;
3260
3261         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3262                 return -EFAULT;
3263
3264         useglobal = 0;
3265         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
3266                                    sizeof(struct dasd_snid_data), device);
3267         if (IS_ERR(cqr)) {
3268                 mutex_lock(&dasd_reserve_mutex);
3269                 useglobal = 1;
3270                 cqr = &dasd_reserve_req->cqr;
3271                 memset(cqr, 0, sizeof(*cqr));
3272                 memset(&dasd_reserve_req->ccw, 0,
3273                        sizeof(dasd_reserve_req->ccw));
3274                 cqr->cpaddr = &dasd_reserve_req->ccw;
3275                 cqr->data = &dasd_reserve_req->data;
3276                 cqr->magic = DASD_ECKD_MAGIC;
3277         }
3278         ccw = cqr->cpaddr;
3279         ccw->cmd_code = DASD_ECKD_CCW_SNID;
3280         ccw->flags |= CCW_FLAG_SLI;
3281         ccw->count = 12;
3282         ccw->cda = (__u32)(addr_t) cqr->data;
3283         cqr->startdev = device;
3284         cqr->memdev = device;
3285         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3286         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3287         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
3288         cqr->retries = 5;
3289         cqr->expires = 10 * HZ;
3290         cqr->buildclk = get_clock();
3291         cqr->status = DASD_CQR_FILLED;
3292         cqr->lpm = usrparm.path_mask;
3293
3294         rc = dasd_sleep_on_immediatly(cqr);
3295         /* verify that I/O processing didn't modify the path mask */
3296         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
3297                 rc = -EIO;
3298         if (!rc) {
3299                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
3300                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
3301                         rc = -EFAULT;
3302         }
3303
3304         if (useglobal)
3305                 mutex_unlock(&dasd_reserve_mutex);
3306         else
3307                 dasd_sfree_request(cqr, cqr->memdev);
3308         return rc;
3309 }
3310
3311 /*
3312  * Read performance statistics
3313  */
3314 static int
3315 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
3316 {
3317         struct dasd_psf_prssd_data *prssdp;
3318         struct dasd_rssd_perf_stats_t *stats;
3319         struct dasd_ccw_req *cqr;
3320         struct ccw1 *ccw;
3321         int rc;
3322
3323         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
3324                                    (sizeof(struct dasd_psf_prssd_data) +
3325                                     sizeof(struct dasd_rssd_perf_stats_t)),
3326                                    device);
3327         if (IS_ERR(cqr)) {
3328                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3329                             "Could not allocate initialization request");
3330                 return PTR_ERR(cqr);
3331         }
3332         cqr->startdev = device;
3333         cqr->memdev = device;
3334         cqr->retries = 0;
3335         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3336         cqr->expires = 10 * HZ;
3337
3338         /* Prepare for Read Subsystem Data */
3339         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3340         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
3341         prssdp->order = PSF_ORDER_PRSSD;
3342         prssdp->suborder = 0x01;        /* Performance Statistics */
3343         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
3344
3345         ccw = cqr->cpaddr;
3346         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3347         ccw->count = sizeof(struct dasd_psf_prssd_data);
3348         ccw->flags |= CCW_FLAG_CC;
3349         ccw->cda = (__u32)(addr_t) prssdp;
3350
3351         /* Read Subsystem Data - Performance Statistics */
3352         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3353         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
3354
3355         ccw++;
3356         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3357         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
3358         ccw->cda = (__u32)(addr_t) stats;
3359
3360         cqr->buildclk = get_clock();
3361         cqr->status = DASD_CQR_FILLED;
3362         rc = dasd_sleep_on(cqr);
3363         if (rc == 0) {
3364                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3365                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3366                 if (copy_to_user(argp, stats,
3367                                  sizeof(struct dasd_rssd_perf_stats_t)))
3368                         rc = -EFAULT;
3369         }
3370         dasd_sfree_request(cqr, cqr->memdev);
3371         return rc;
3372 }
3373
3374 /*
3375  * Get attributes (cache operations)
3376  * Returnes the cache attributes used in Define Extend (DE).
3377  */
3378 static int
3379 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
3380 {
3381         struct dasd_eckd_private *private =
3382                 (struct dasd_eckd_private *)device->private;
3383         struct attrib_data_t attrib = private->attrib;
3384         int rc;
3385
3386         if (!capable(CAP_SYS_ADMIN))
3387                 return -EACCES;
3388         if (!argp)
3389                 return -EINVAL;
3390
3391         rc = 0;
3392         if (copy_to_user(argp, (long *) &attrib,
3393                          sizeof(struct attrib_data_t)))
3394                 rc = -EFAULT;
3395
3396         return rc;
3397 }
3398
3399 /*
3400  * Set attributes (cache operations)
3401  * Stores the attributes for cache operation to be used in Define Extend (DE).
3402  */
3403 static int
3404 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
3405 {
3406         struct dasd_eckd_private *private =
3407                 (struct dasd_eckd_private *)device->private;
3408         struct attrib_data_t attrib;
3409
3410         if (!capable(CAP_SYS_ADMIN))
3411                 return -EACCES;
3412         if (!argp)
3413                 return -EINVAL;
3414
3415         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
3416                 return -EFAULT;
3417         private->attrib = attrib;
3418
3419         dev_info(&device->cdev->dev,
3420                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
3421                  private->attrib.operation, private->attrib.nr_cyl);
3422         return 0;
3423 }
3424
3425 /*
3426  * Issue syscall I/O to EMC Symmetrix array.
3427  * CCWs are PSF and RSSD
3428  */
3429 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
3430 {
3431         struct dasd_symmio_parms usrparm;
3432         char *psf_data, *rssd_result;
3433         struct dasd_ccw_req *cqr;
3434         struct ccw1 *ccw;
3435         char psf0, psf1;
3436         int rc;
3437
3438         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
3439                 return -EACCES;
3440         psf0 = psf1 = 0;
3441
3442         /* Copy parms from caller */
3443         rc = -EFAULT;
3444         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3445                 goto out;
3446         if (is_compat_task() || sizeof(long) == 4) {
3447                 /* Make sure pointers are sane even on 31 bit. */
3448                 rc = -EINVAL;
3449                 if ((usrparm.psf_data >> 32) != 0)
3450                         goto out;
3451                 if ((usrparm.rssd_result >> 32) != 0)
3452                         goto out;
3453                 usrparm.psf_data &= 0x7fffffffULL;
3454                 usrparm.rssd_result &= 0x7fffffffULL;
3455         }
3456         /* alloc I/O data area */
3457         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
3458         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
3459         if (!psf_data || !rssd_result) {
3460                 rc = -ENOMEM;
3461                 goto out_free;
3462         }
3463
3464         /* get syscall header from user space */
3465         rc = -EFAULT;
3466         if (copy_from_user(psf_data,
3467                            (void __user *)(unsigned long) usrparm.psf_data,
3468                            usrparm.psf_data_len))
3469                 goto out_free;
3470         psf0 = psf_data[0];
3471         psf1 = psf_data[1];
3472
3473         /* setup CCWs for PSF + RSSD */
3474         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
3475         if (IS_ERR(cqr)) {
3476                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3477                         "Could not allocate initialization request");
3478                 rc = PTR_ERR(cqr);
3479                 goto out_free;
3480         }
3481
3482         cqr->startdev = device;
3483         cqr->memdev = device;
3484         cqr->retries = 3;
3485         cqr->expires = 10 * HZ;
3486         cqr->buildclk = get_clock();
3487         cqr->status = DASD_CQR_FILLED;
3488
3489         /* Build the ccws */
3490         ccw = cqr->cpaddr;
3491
3492         /* PSF ccw */
3493         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3494         ccw->count = usrparm.psf_data_len;
3495         ccw->flags |= CCW_FLAG_CC;
3496         ccw->cda = (__u32)(addr_t) psf_data;
3497
3498         ccw++;
3499
3500         /* RSSD ccw  */
3501         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3502         ccw->count = usrparm.rssd_result_len;
3503         ccw->flags = CCW_FLAG_SLI ;
3504         ccw->cda = (__u32)(addr_t) rssd_result;
3505
3506         rc = dasd_sleep_on(cqr);
3507         if (rc)
3508                 goto out_sfree;
3509
3510         rc = -EFAULT;
3511         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
3512                            rssd_result, usrparm.rssd_result_len))
3513                 goto out_sfree;
3514         rc = 0;
3515
3516 out_sfree:
3517         dasd_sfree_request(cqr, cqr->memdev);
3518 out_free:
3519         kfree(rssd_result);
3520         kfree(psf_data);
3521 out:
3522         DBF_DEV_EVENT(DBF_WARNING, device,
3523                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
3524                       (int) psf0, (int) psf1, rc);
3525         return rc;
3526 }
3527
3528 static int
3529 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
3530 {
3531         struct dasd_device *device = block->base;
3532
3533         switch (cmd) {
3534         case BIODASDGATTR:
3535                 return dasd_eckd_get_attrib(device, argp);
3536         case BIODASDSATTR:
3537                 return dasd_eckd_set_attrib(device, argp);
3538         case BIODASDPSRD:
3539                 return dasd_eckd_performance(device, argp);
3540         case BIODASDRLSE:
3541                 return dasd_eckd_release(device);
3542         case BIODASDRSRV:
3543                 return dasd_eckd_reserve(device);
3544         case BIODASDSLCK:
3545                 return dasd_eckd_steal_lock(device);
3546         case BIODASDSNID:
3547                 return dasd_eckd_snid(device, argp);
3548         case BIODASDSYMMIO:
3549                 return dasd_symm_io(device, argp);
3550         default:
3551                 return -ENOIOCTLCMD;
3552         }
3553 }
3554
3555 /*
3556  * Dump the range of CCWs into 'page' buffer
3557  * and return number of printed chars.
3558  */
3559 static int
3560 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
3561 {
3562         int len, count;
3563         char *datap;
3564
3565         len = 0;
3566         while (from <= to) {
3567                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3568                                " CCW %p: %08X %08X DAT:",
3569                                from, ((int *) from)[0], ((int *) from)[1]);
3570
3571                 /* get pointer to data (consider IDALs) */
3572                 if (from->flags & CCW_FLAG_IDA)
3573                         datap = (char *) *((addr_t *) (addr_t) from->cda);
3574                 else
3575                         datap = (char *) ((addr_t) from->cda);
3576
3577                 /* dump data (max 32 bytes) */
3578                 for (count = 0; count < from->count && count < 32; count++) {
3579                         if (count % 8 == 0) len += sprintf(page + len, " ");
3580                         if (count % 4 == 0) len += sprintf(page + len, " ");
3581                         len += sprintf(page + len, "%02x", datap[count]);
3582                 }
3583                 len += sprintf(page + len, "\n");
3584                 from++;
3585         }
3586         return len;
3587 }
3588
3589 static void
3590 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
3591                          char *reason)
3592 {
3593         u64 *sense;
3594         u64 *stat;
3595
3596         sense = (u64 *) dasd_get_sense(irb);
3597         stat = (u64 *) &irb->scsw;
3598         if (sense) {
3599                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
3600                               "%016llx %016llx %016llx %016llx",
3601                               reason, *stat, *((u32 *) (stat + 1)),
3602                               sense[0], sense[1], sense[2], sense[3]);
3603         } else {
3604                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
3605                               reason, *stat, *((u32 *) (stat + 1)),
3606                               "NO VALID SENSE");
3607         }
3608 }
3609
3610 /*
3611  * Print sense data and related channel program.
3612  * Parts are printed because printk buffer is only 1024 bytes.
3613  */
3614 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
3615                                  struct dasd_ccw_req *req, struct irb *irb)
3616 {
3617         char *page;
3618         struct ccw1 *first, *last, *fail, *from, *to;
3619         int len, sl, sct;
3620
3621         page = (char *) get_zeroed_page(GFP_ATOMIC);
3622         if (page == NULL) {
3623                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3624                               "No memory to dump sense data\n");
3625                 return;
3626         }
3627         /* dump the sense data */
3628         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3629                       " I/O status report for device %s:\n",
3630                       dev_name(&device->cdev->dev));
3631         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3632                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
3633                        "CS:%02X RC:%d\n",
3634                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
3635                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
3636                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
3637                        req ? req->intrc : 0);
3638         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3639                        " device %s: Failing CCW: %p\n",
3640                        dev_name(&device->cdev->dev),
3641                        (void *) (addr_t) irb->scsw.cmd.cpa);
3642         if (irb->esw.esw0.erw.cons) {
3643                 for (sl = 0; sl < 4; sl++) {
3644                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3645                                        " Sense(hex) %2d-%2d:",
3646                                        (8 * sl), ((8 * sl) + 7));
3647
3648                         for (sct = 0; sct < 8; sct++) {
3649                                 len += sprintf(page + len, " %02x",
3650                                                irb->ecw[8 * sl + sct]);
3651                         }
3652                         len += sprintf(page + len, "\n");
3653                 }
3654
3655                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
3656                         /* 24 Byte Sense Data */
3657                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3658                                 " 24 Byte: %x MSG %x, "
3659                                 "%s MSGb to SYSOP\n",
3660                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
3661                                 irb->ecw[1] & 0x10 ? "" : "no");
3662                 } else {
3663                         /* 32 Byte Sense Data */
3664                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3665                                 " 32 Byte: Format: %x "
3666                                 "Exception class %x\n",
3667                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
3668                 }
3669         } else {
3670                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3671                         " SORRY - NO VALID SENSE AVAILABLE\n");
3672         }
3673         printk("%s", page);
3674
3675         if (req) {
3676                 /* req == NULL for unsolicited interrupts */
3677                 /* dump the Channel Program (max 140 Bytes per line) */
3678                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
3679                 first = req->cpaddr;
3680                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
3681                 to = min(first + 6, last);
3682                 len = sprintf(page,  KERN_ERR PRINTK_HEADER
3683                               " Related CP in req: %p\n", req);
3684                 dasd_eckd_dump_ccw_range(first, to, page + len);
3685                 printk("%s", page);
3686
3687                 /* print failing CCW area (maximum 4) */
3688                 /* scsw->cda is either valid or zero  */
3689                 len = 0;
3690                 from = ++to;
3691                 fail = (struct ccw1 *)(addr_t)
3692                                 irb->scsw.cmd.cpa; /* failing CCW */
3693                 if (from <  fail - 2) {
3694                         from = fail - 2;     /* there is a gap - print header */
3695                         len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
3696                 }
3697                 to = min(fail + 1, last);
3698                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
3699
3700                 /* print last CCWs (maximum 2) */
3701                 from = max(from, ++to);
3702                 if (from < last - 1) {
3703                         from = last - 1;     /* there is a gap - print header */
3704                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
3705                 }
3706                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
3707                 if (len > 0)
3708                         printk("%s", page);
3709         }
3710         free_page((unsigned long) page);
3711 }
3712
3713
3714 /*
3715  * Print sense data from a tcw.
3716  */
3717 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
3718                                  struct dasd_ccw_req *req, struct irb *irb)
3719 {
3720         char *page;
3721         int len, sl, sct, residual;
3722         struct tsb *tsb;
3723         u8 *sense, *rcq;
3724
3725         page = (char *) get_zeroed_page(GFP_ATOMIC);
3726         if (page == NULL) {
3727                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
3728                             "No memory to dump sense data");
3729                 return;
3730         }
3731         /* dump the sense data */
3732         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3733                       " I/O status report for device %s:\n",
3734                       dev_name(&device->cdev->dev));
3735         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3736                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
3737                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
3738                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
3739                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
3740                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
3741                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
3742                        req ? req->intrc : 0);
3743         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3744                        " device %s: Failing TCW: %p\n",
3745                        dev_name(&device->cdev->dev),
3746                        (void *) (addr_t) irb->scsw.tm.tcw);
3747
3748         tsb = NULL;
3749         sense = NULL;
3750         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
3751                 tsb = tcw_get_tsb(
3752                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
3753
3754         if (tsb) {
3755                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3756                                " tsb->length %d\n", tsb->length);
3757                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3758                                " tsb->flags %x\n", tsb->flags);
3759                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3760                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
3761                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3762                                " tsb->count %d\n", tsb->count);
3763                 residual = tsb->count - 28;
3764                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3765                                " residual %d\n", residual);
3766
3767                 switch (tsb->flags & 0x07) {
3768                 case 1: /* tsa_iostat */
3769                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3770                                " tsb->tsa.iostat.dev_time %d\n",
3771                                        tsb->tsa.iostat.dev_time);
3772                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3773                                " tsb->tsa.iostat.def_time %d\n",
3774                                        tsb->tsa.iostat.def_time);
3775                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3776                                " tsb->tsa.iostat.queue_time %d\n",
3777                                        tsb->tsa.iostat.queue_time);
3778                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3779                                " tsb->tsa.iostat.dev_busy_time %d\n",
3780                                        tsb->tsa.iostat.dev_busy_time);
3781                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3782                                " tsb->tsa.iostat.dev_act_time %d\n",
3783                                        tsb->tsa.iostat.dev_act_time);
3784                         sense = tsb->tsa.iostat.sense;
3785                         break;
3786                 case 2: /* ts_ddpc */
3787                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3788                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
3789                         for (sl = 0; sl < 2; sl++) {
3790                                 len += sprintf(page + len,
3791                                                KERN_ERR PRINTK_HEADER
3792                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
3793                                                (8 * sl), ((8 * sl) + 7));
3794                                 rcq = tsb->tsa.ddpc.rcq;
3795                                 for (sct = 0; sct < 8; sct++) {
3796                                         len += sprintf(page + len, " %02x",
3797                                                        rcq[8 * sl + sct]);
3798                                 }
3799                                 len += sprintf(page + len, "\n");
3800                         }
3801                         sense = tsb->tsa.ddpc.sense;
3802                         break;
3803                 case 3: /* tsa_intrg */
3804                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3805                                       " tsb->tsa.intrg.: not supportet yet \n");
3806                         break;
3807                 }
3808
3809                 if (sense) {
3810                         for (sl = 0; sl < 4; sl++) {
3811                                 len += sprintf(page + len,
3812                                                KERN_ERR PRINTK_HEADER
3813                                                " Sense(hex) %2d-%2d:",
3814                                                (8 * sl), ((8 * sl) + 7));
3815                                 for (sct = 0; sct < 8; sct++) {
3816                                         len += sprintf(page + len, " %02x",
3817                                                        sense[8 * sl + sct]);
3818                                 }
3819                                 len += sprintf(page + len, "\n");
3820                         }
3821
3822                         if (sense[27] & DASD_SENSE_BIT_0) {
3823                                 /* 24 Byte Sense Data */
3824                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3825                                         " 24 Byte: %x MSG %x, "
3826                                         "%s MSGb to SYSOP\n",
3827                                         sense[7] >> 4, sense[7] & 0x0f,
3828                                         sense[1] & 0x10 ? "" : "no");
3829                         } else {
3830                                 /* 32 Byte Sense Data */
3831                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3832                                         " 32 Byte: Format: %x "
3833                                         "Exception class %x\n",
3834                                         sense[6] & 0x0f, sense[22] >> 4);
3835                         }
3836                 } else {
3837                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3838                                 " SORRY - NO VALID SENSE AVAILABLE\n");
3839                 }
3840         } else {
3841                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3842                         " SORRY - NO TSB DATA AVAILABLE\n");
3843         }
3844         printk("%s", page);
3845         free_page((unsigned long) page);
3846 }
3847
3848 static void dasd_eckd_dump_sense(struct dasd_device *device,
3849                                  struct dasd_ccw_req *req, struct irb *irb)
3850 {
3851         if (scsw_is_tm(&irb->scsw))
3852                 dasd_eckd_dump_sense_tcw(device, req, irb);
3853         else
3854                 dasd_eckd_dump_sense_ccw(device, req, irb);
3855 }
3856
3857 static int dasd_eckd_pm_freeze(struct dasd_device *device)
3858 {
3859         /*
3860          * the device should be disconnected from our LCU structure
3861          * on restore we will reconnect it and reread LCU specific
3862          * information like PAV support that might have changed
3863          */
3864         dasd_alias_remove_device(device);
3865         dasd_alias_disconnect_device_from_lcu(device);
3866
3867         return 0;
3868 }
3869
3870 static int dasd_eckd_restore_device(struct dasd_device *device)
3871 {
3872         struct dasd_eckd_private *private;
3873         struct dasd_eckd_characteristics temp_rdc_data;
3874         int is_known, rc;
3875         struct dasd_uid temp_uid;
3876         unsigned long flags;
3877
3878         private = (struct dasd_eckd_private *) device->private;
3879
3880         /* Read Configuration Data */
3881         rc = dasd_eckd_read_conf(device);
3882         if (rc)
3883                 goto out_err;
3884
3885         dasd_eckd_get_uid(device, &temp_uid);
3886         /* Generate device unique id */
3887         rc = dasd_eckd_generate_uid(device);
3888         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
3889         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
3890                 dev_err(&device->cdev->dev, "The UID of the DASD has "
3891                         "changed\n");
3892         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
3893         if (rc)
3894                 goto out_err;
3895
3896         /* register lcu with alias handling, enable PAV if this is a new lcu */
3897         is_known = dasd_alias_make_device_known_to_lcu(device);
3898         if (is_known < 0)
3899                 return is_known;
3900         if (!is_known) {
3901                 dasd_eckd_validate_server(device);
3902                 dasd_alias_lcu_setup_complete(device);
3903         } else
3904                 dasd_alias_wait_for_lcu_setup(device);
3905
3906         /* RE-Read Configuration Data */
3907         rc = dasd_eckd_read_conf(device);
3908         if (rc)
3909                 goto out_err;
3910
3911         /* Read Feature Codes */
3912         dasd_eckd_read_features(device);
3913
3914         /* Read Device Characteristics */
3915         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
3916                                          &temp_rdc_data, 64);
3917         if (rc) {
3918                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
3919                                 "Read device characteristic failed, rc=%d", rc);
3920                 goto out_err;
3921         }
3922         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
3923         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
3924         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
3925
3926         /* add device to alias management */
3927         dasd_alias_add_device(device);
3928
3929         return 0;
3930
3931 out_err:
3932         return -1;
3933 }
3934
3935 static int dasd_eckd_reload_device(struct dasd_device *device)
3936 {
3937         struct dasd_eckd_private *private;
3938         int rc, old_base;
3939         char print_uid[60];
3940         struct dasd_uid uid;
3941         unsigned long flags;
3942
3943         private = (struct dasd_eckd_private *) device->private;
3944
3945         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
3946         old_base = private->uid.base_unit_addr;
3947         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
3948
3949         /* Read Configuration Data */
3950         rc = dasd_eckd_read_conf(device);
3951         if (rc)
3952                 goto out_err;
3953
3954         rc = dasd_eckd_generate_uid(device);
3955         if (rc)
3956                 goto out_err;
3957         /*
3958          * update unit address configuration and
3959          * add device to alias management
3960          */
3961         dasd_alias_update_add_device(device);
3962
3963         dasd_eckd_get_uid(device, &uid);
3964
3965         if (old_base != uid.base_unit_addr) {
3966                 if (strlen(uid.vduit) > 0)
3967                         snprintf(print_uid, sizeof(print_uid),
3968                                  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
3969                                  uid.ssid, uid.base_unit_addr, uid.vduit);
3970                 else
3971                         snprintf(print_uid, sizeof(print_uid),
3972                                  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
3973                                  uid.ssid, uid.base_unit_addr);
3974
3975                 dev_info(&device->cdev->dev,
3976                          "An Alias device was reassigned to a new base device "
3977                          "with UID: %s\n", print_uid);
3978         }
3979         return 0;
3980
3981 out_err:
3982         return -1;
3983 }
3984
3985 static struct ccw_driver dasd_eckd_driver = {
3986         .driver = {
3987                 .name   = "dasd-eckd",
3988                 .owner  = THIS_MODULE,
3989         },
3990         .ids         = dasd_eckd_ids,
3991         .probe       = dasd_eckd_probe,
3992         .remove      = dasd_generic_remove,
3993         .set_offline = dasd_generic_set_offline,
3994         .set_online  = dasd_eckd_set_online,
3995         .notify      = dasd_generic_notify,
3996         .path_event  = dasd_generic_path_event,
3997         .freeze      = dasd_generic_pm_freeze,
3998         .thaw        = dasd_generic_restore_device,
3999         .restore     = dasd_generic_restore_device,
4000         .uc_handler  = dasd_generic_uc_handler,
4001 };
4002
4003 /*
4004  * max_blocks is dependent on the amount of storage that is available
4005  * in the static io buffer for each device. Currently each device has
4006  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
4007  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
4008  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
4009  * addition we have one define extent ccw + 16 bytes of data and one
4010  * locate record ccw + 16 bytes of data. That makes:
4011  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
4012  * We want to fit two into the available memory so that we can immediately
4013  * start the next request if one finishes off. That makes 249.5 blocks
4014  * for one request. Give a little safety and the result is 240.
4015  */
4016 static struct dasd_discipline dasd_eckd_discipline = {
4017         .owner = THIS_MODULE,
4018         .name = "ECKD",
4019         .ebcname = "ECKD",
4020         .max_blocks = 190,
4021         .check_device = dasd_eckd_check_characteristics,
4022         .uncheck_device = dasd_eckd_uncheck_device,
4023         .do_analysis = dasd_eckd_do_analysis,
4024         .verify_path = dasd_eckd_verify_path,
4025         .ready_to_online = dasd_eckd_ready_to_online,
4026         .online_to_ready = dasd_eckd_online_to_ready,
4027         .fill_geometry = dasd_eckd_fill_geometry,
4028         .start_IO = dasd_start_IO,
4029         .term_IO = dasd_term_IO,
4030         .handle_terminated_request = dasd_eckd_handle_terminated_request,
4031         .format_device = dasd_eckd_format_device,
4032         .erp_action = dasd_eckd_erp_action,
4033         .erp_postaction = dasd_eckd_erp_postaction,
4034         .check_for_device_change = dasd_eckd_check_for_device_change,
4035         .build_cp = dasd_eckd_build_alias_cp,
4036         .free_cp = dasd_eckd_free_alias_cp,
4037         .dump_sense = dasd_eckd_dump_sense,
4038         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
4039         .fill_info = dasd_eckd_fill_info,
4040         .ioctl = dasd_eckd_ioctl,
4041         .freeze = dasd_eckd_pm_freeze,
4042         .restore = dasd_eckd_restore_device,
4043         .reload = dasd_eckd_reload_device,
4044         .get_uid = dasd_eckd_get_uid,
4045 };
4046
4047 static int __init
4048 dasd_eckd_init(void)
4049 {
4050         int ret;
4051
4052         ASCEBC(dasd_eckd_discipline.ebcname, 4);
4053         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
4054                                    GFP_KERNEL | GFP_DMA);
4055         if (!dasd_reserve_req)
4056                 return -ENOMEM;
4057         path_verification_worker = kmalloc(sizeof(*path_verification_worker),
4058                                    GFP_KERNEL | GFP_DMA);
4059         if (!path_verification_worker) {
4060                 kfree(dasd_reserve_req);
4061                 return -ENOMEM;
4062         }
4063         ret = ccw_driver_register(&dasd_eckd_driver);
4064         if (!ret)
4065                 wait_for_device_probe();
4066         else {
4067                 kfree(path_verification_worker);
4068                 kfree(dasd_reserve_req);
4069         }
4070         return ret;
4071 }
4072
4073 static void __exit
4074 dasd_eckd_cleanup(void)
4075 {
4076         ccw_driver_unregister(&dasd_eckd_driver);
4077         kfree(path_verification_worker);
4078         kfree(dasd_reserve_req);
4079 }
4080
4081 module_init(dasd_eckd_init);
4082 module_exit(dasd_eckd_cleanup);