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 /*
 848  * Wakeup helper for read_conf
 849  * if the cqr is not done and needs some error recovery
 850  * the buffer has to be re-initialized with the EBCDIC "V1.0"
 851  * to show support for virtual device SNEQ
 852  */
 853 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
 854 {
 855         struct ccw1 *ccw;
 856         __u8 *rcd_buffer;
 857
 858         if (cqr->status !=  DASD_CQR_DONE) {
 859                 ccw = cqr->cpaddr;
 860                 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
 861                 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
 862
 863                 rcd_buffer[0] = 0xE5;
 864                 rcd_buffer[1] = 0xF1;
 865                 rcd_buffer[2] = 0x4B;
 866                 rcd_buffer[3] = 0xF0;
 867         }
 868         dasd_wakeup_cb(cqr, data);
 869 }
 870
 871 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
 872                                            struct dasd_ccw_req *cqr,
 873                                            __u8 *rcd_buffer,
 874                                            __u8 lpm)
 875 {
 876         struct ciw *ciw;
 877         int rc;
 878         /*
 879          * sanity check: scan for RCD command in extended SenseID data
 880          * some devices do not support RCD
 881          */
 882         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 883         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
 884                 return -EOPNOTSUPP;
 885
 886         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
 887         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 888         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
 889         cqr->retries = 5;
 890         cqr->callback = read_conf_cb;
 891         rc = dasd_sleep_on_immediatly(cqr);
 892         return rc;
 893 }
 894
 895 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 896                                    void **rcd_buffer,
 897                                    int *rcd_buffer_size, __u8 lpm)
 898 {
 899         struct ciw *ciw;
 900         char *rcd_buf = NULL;
 901         int ret;
 902         struct dasd_ccw_req *cqr;
 903
 904         /*
 905          * sanity check: scan for RCD command in extended SenseID data
 906          * some devices do not support RCD
 907          */
 908         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 909         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
 910                 ret = -EOPNOTSUPP;
 911                 goto out_error;
 912         }
 913         rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
 914         if (!rcd_buf) {
 915                 ret = -ENOMEM;
 916                 goto out_error;
 917         }
 918         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
 919                                    0, /* use rcd_buf as data ara */
 920                                    device);
 921         if (IS_ERR(cqr)) {
 922                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 923                               "Could not allocate RCD request");
 924                 ret = -ENOMEM;
 925                 goto out_error;
 926         }
 927         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
 928         cqr->callback = read_conf_cb;
 929         ret = dasd_sleep_on(cqr);
 930         /*
 931          * on success we update the user input parms
 932          */
 933         dasd_sfree_request(cqr, cqr->memdev);
 934         if (ret)
 935                 goto out_error;
 936
 937         *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
 938         *rcd_buffer = rcd_buf;
 939         return 0;
 940 out_error:
 941         kfree(rcd_buf);
 942         *rcd_buffer = NULL;
 943         *rcd_buffer_size = 0;
 944         return ret;
 945 }
 946
 947 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
 948 {
 949
 950         struct dasd_sneq *sneq;
 951         int i, count;
 952
 953         private->ned = NULL;
 954         private->sneq = NULL;
 955         private->vdsneq = NULL;
 956         private->gneq = NULL;
 957         count = private->conf_len / sizeof(struct dasd_sneq);
 958         sneq = (struct dasd_sneq *)private->conf_data;
 959         for (i = 0; i < count; ++i) {
 960                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 961                         private->sneq = sneq;
 962                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 963                         private->vdsneq = (struct vd_sneq *)sneq;
 964                 else if (sneq->flags.identifier == 2)
 965                         private->gneq = (struct dasd_gneq *)sneq;
 966                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 967                         private->ned = (struct dasd_ned *)sneq;
 968                 sneq++;
 969         }
 970         if (!private->ned || !private->gneq) {
 971                 private->ned = NULL;
 972                 private->sneq = NULL;
 973                 private->vdsneq = NULL;
 974                 private->gneq = NULL;
 975                 return -EINVAL;
 976         }
 977         return 0;
 978
 979 };
 980
 981 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
 982 {
 983         struct dasd_gneq *gneq;
 984         int i, count, found;
 985
 986         count = conf_len / sizeof(*gneq);
 987         gneq = (struct dasd_gneq *)conf_data;
 988         found = 0;
 989         for (i = 0; i < count; ++i) {
 990                 if (gneq->flags.identifier == 2) {
 991                         found = 1;
 992                         break;
 993                 }
 994                 gneq++;
 995         }
 996         if (found)
 997                 return ((char *)gneq)[18] & 0x07;
 998         else
 999                 return 0;
1000 }
1001
1002 static int dasd_eckd_read_conf(struct dasd_device *device)
1003 {
1004         void *conf_data;
1005         int conf_len, conf_data_saved;
1006         int rc;
1007         __u8 lpm, opm;
1008         struct dasd_eckd_private *private;
1009         struct dasd_path *path_data;
1010
1011         private = (struct dasd_eckd_private *) device->private;
1012         path_data = &device->path_data;
1013         opm = ccw_device_get_path_mask(device->cdev);
1014         lpm = 0x80;
1015         conf_data_saved = 0;
1016         /* get configuration data per operational path */
1017         for (lpm = 0x80; lpm; lpm>>= 1) {
1018                 if (lpm & opm) {
1019                         rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1020                                                      &conf_len, lpm);
1021                         if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
1022                                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1023                                           "Read configuration data returned "
1024                                           "error %d", rc);
1025                                 return rc;
1026                         }
1027                         if (conf_data == NULL) {
1028                                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1029                                                 "No configuration data "
1030                                                 "retrieved");
1031                                 /* no further analysis possible */
1032                                 path_data->opm |= lpm;
1033                                 continue;       /* no error */
1034                         }
1035                         /* save first valid configuration data */
1036                         if (!conf_data_saved) {
1037                                 kfree(private->conf_data);
1038                                 private->conf_data = conf_data;
1039                                 private->conf_len = conf_len;
1040                                 if (dasd_eckd_identify_conf_parts(private)) {
1041                                         private->conf_data = NULL;
1042                                         private->conf_len = 0;
1043                                         kfree(conf_data);
1044                                         continue;
1045                                 }
1046                                 conf_data_saved++;
1047                         }
1048                         switch (dasd_eckd_path_access(conf_data, conf_len)) {
1049                         case 0x02:
1050                                 path_data->npm |= lpm;
1051                                 break;
1052                         case 0x03:
1053                                 path_data->ppm |= lpm;
1054                                 break;
1055                         }
1056                         path_data->opm |= lpm;
1057                         if (conf_data != private->conf_data)
1058                                 kfree(conf_data);
1059                 }
1060         }
1061         return 0;
1062 }
1063
1064 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1065 {
1066         struct dasd_eckd_private *private;
1067         int mdc;
1068         u32 fcx_max_data;
1069
1070         private = (struct dasd_eckd_private *) device->private;
1071         if (private->fcx_max_data) {
1072                 mdc = ccw_device_get_mdc(device->cdev, lpm);
1073                 if ((mdc < 0)) {
1074                         dev_warn(&device->cdev->dev,
1075                                  "Detecting the maximum data size for zHPF "
1076                                  "requests failed (rc=%d) for a new path %x\n",
1077                                  mdc, lpm);
1078                         return mdc;
1079                 }
1080                 fcx_max_data = mdc * FCX_MAX_DATA_FACTOR;
1081                 if (fcx_max_data < private->fcx_max_data) {
1082                         dev_warn(&device->cdev->dev,
1083                                  "The maximum data size for zHPF requests %u "
1084                                  "on a new path %x is below the active maximum "
1085                                  "%u\n", fcx_max_data, lpm,
1086                                  private->fcx_max_data);
1087                         return -EACCES;
1088                 }
1089         }
1090         return 0;
1091 }
1092
1093 static void do_path_verification_work(struct work_struct *work)
1094 {
1095         struct path_verification_work_data *data;
1096         struct dasd_device *device;
1097         __u8 lpm, opm, npm, ppm, epm;
1098         unsigned long flags;
1099         int rc;
1100
1101         data = container_of(work, struct path_verification_work_data, worker);
1102         device = data->device;
1103
1104         /* delay path verification until device was resumed */
1105         if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1106                 schedule_work(work);
1107                 return;
1108         }
1109
1110         opm = 0;
1111         npm = 0;
1112         ppm = 0;
1113         epm = 0;
1114         for (lpm = 0x80; lpm; lpm >>= 1) {
1115                 if (lpm & data->tbvpm) {
1116                         memset(data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1117                         memset(&data->cqr, 0, sizeof(data->cqr));
1118                         data->cqr.cpaddr = &data->ccw;
1119                         rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1120                                                              data->rcd_buffer,
1121                                                              lpm);
1122                         if (!rc) {
1123                                 switch (dasd_eckd_path_access(data->rcd_buffer,
1124                                                      DASD_ECKD_RCD_DATA_SIZE)) {
1125                                 case 0x02:
1126                                         npm |= lpm;
1127                                         break;
1128                                 case 0x03:
1129                                         ppm |= lpm;
1130                                         break;
1131                                 }
1132                                 opm |= lpm;
1133                         } else if (rc == -EOPNOTSUPP) {
1134                                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1135                                        "path verification: No configuration "
1136                                        "data retrieved");
1137                                 opm |= lpm;
1138                         } else if (rc == -EAGAIN) {
1139                                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1140                                         "path verification: device is stopped,"
1141                                         " try again later");
1142                                 epm |= lpm;
1143                         } else {
1144                                 dev_warn(&device->cdev->dev,
1145                                          "Reading device feature codes failed "
1146                                          "(rc=%d) for new path %x\n", rc, lpm);
1147                                 continue;
1148                         }
1149                         if (verify_fcx_max_data(device, lpm)) {
1150                                 opm &= ~lpm;
1151                                 npm &= ~lpm;
1152                                 ppm &= ~lpm;
1153                         }
1154                 }
1155         }
1156         /*
1157          * There is a small chance that a path is lost again between
1158          * above path verification and the following modification of
1159          * the device opm mask. We could avoid that race here by using
1160          * yet another path mask, but we rather deal with this unlikely
1161          * situation in dasd_start_IO.
1162          */
1163         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1164         if (!device->path_data.opm && opm) {
1165                 device->path_data.opm = opm;
1166                 dasd_generic_path_operational(device);
1167         } else
1168                 device->path_data.opm |= opm;
1169         device->path_data.npm |= npm;
1170         device->path_data.ppm |= ppm;
1171         device->path_data.tbvpm |= epm;
1172         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1173
1174         dasd_put_device(device);
1175         if (data->isglobal)
1176                 mutex_unlock(&dasd_path_verification_mutex);
1177         else
1178                 kfree(data);
1179 }
1180
1181 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1182 {
1183         struct path_verification_work_data *data;
1184
1185         data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1186         if (!data) {
1187                 if (mutex_trylock(&dasd_path_verification_mutex)) {
1188                         data = path_verification_worker;
1189                         data->isglobal = 1;
1190                 } else
1191                         return -ENOMEM;
1192         } else {
1193                 memset(data, 0, sizeof(*data));
1194                 data->isglobal = 0;
1195         }
1196         INIT_WORK(&data->worker, do_path_verification_work);
1197         dasd_get_device(device);
1198         data->device = device;
1199         data->tbvpm = lpm;
1200         schedule_work(&data->worker);
1201         return 0;
1202 }
1203
1204 static int dasd_eckd_read_features(struct dasd_device *device)
1205 {
1206         struct dasd_psf_prssd_data *prssdp;
1207         struct dasd_rssd_features *features;
1208         struct dasd_ccw_req *cqr;
1209         struct ccw1 *ccw;
1210         int rc;
1211         struct dasd_eckd_private *private;
1212
1213         private = (struct dasd_eckd_private *) device->private;
1214         memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1215         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1216                                    (sizeof(struct dasd_psf_prssd_data) +
1217                                     sizeof(struct dasd_rssd_features)),
1218                                    device);
1219         if (IS_ERR(cqr)) {
1220                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1221                                 "allocate initialization request");
1222                 return PTR_ERR(cqr);
1223         }
1224         cqr->startdev = device;
1225         cqr->memdev = device;
1226         cqr->block = NULL;
1227         cqr->retries = 256;
1228         cqr->expires = 10 * HZ;
1229
1230         /* Prepare for Read Subsystem Data */
1231         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1232         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1233         prssdp->order = PSF_ORDER_PRSSD;
1234         prssdp->suborder = 0x41;        /* Read Feature Codes */
1235         /* all other bytes of prssdp must be zero */
1236
1237         ccw = cqr->cpaddr;
1238         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1239         ccw->count = sizeof(struct dasd_psf_prssd_data);
1240         ccw->flags |= CCW_FLAG_CC;
1241         ccw->cda = (__u32)(addr_t) prssdp;
1242
1243         /* Read Subsystem Data - feature codes */
1244         features = (struct dasd_rssd_features *) (prssdp + 1);
1245         memset(features, 0, sizeof(struct dasd_rssd_features));
1246
1247         ccw++;
1248         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1249         ccw->count = sizeof(struct dasd_rssd_features);
1250         ccw->cda = (__u32)(addr_t) features;
1251
1252         cqr->buildclk = get_clock();
1253         cqr->status = DASD_CQR_FILLED;
1254         rc = dasd_sleep_on(cqr);
1255         if (rc == 0) {
1256                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1257                 features = (struct dasd_rssd_features *) (prssdp + 1);
1258                 memcpy(&private->features, features,
1259                        sizeof(struct dasd_rssd_features));
1260         } else
1261                 dev_warn(&device->cdev->dev, "Reading device feature codes"
1262                          " failed with rc=%d\n", rc);
1263         dasd_sfree_request(cqr, cqr->memdev);
1264         return rc;
1265 }
1266
1267
1268 /*
1269  * Build CP for Perform Subsystem Function - SSC.
1270  */
1271 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1272                                                     int enable_pav)
1273 {
1274         struct dasd_ccw_req *cqr;
1275         struct dasd_psf_ssc_data *psf_ssc_data;
1276         struct ccw1 *ccw;
1277
1278         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1279                                   sizeof(struct dasd_psf_ssc_data),
1280                                   device);
1281
1282         if (IS_ERR(cqr)) {
1283                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1284                            "Could not allocate PSF-SSC request");
1285                 return cqr;
1286         }
1287         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1288         psf_ssc_data->order = PSF_ORDER_SSC;
1289         psf_ssc_data->suborder = 0xc0;
1290         if (enable_pav) {
1291                 psf_ssc_data->suborder |= 0x08;
1292                 psf_ssc_data->reserved[0] = 0x88;
1293         }
1294         ccw = cqr->cpaddr;
1295         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1296         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1297         ccw->count = 66;
1298
1299         cqr->startdev = device;
1300         cqr->memdev = device;
1301         cqr->block = NULL;
1302         cqr->retries = 256;
1303         cqr->expires = 10*HZ;
1304         cqr->buildclk = get_clock();
1305         cqr->status = DASD_CQR_FILLED;
1306         return cqr;
1307 }
1308
1309 /*
1310  * Perform Subsystem Function.
1311  * It is necessary to trigger CIO for channel revalidation since this
1312  * call might change behaviour of DASD devices.
1313  */
1314 static int
1315 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav)
1316 {
1317         struct dasd_ccw_req *cqr;
1318         int rc;
1319
1320         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1321         if (IS_ERR(cqr))
1322                 return PTR_ERR(cqr);
1323
1324         rc = dasd_sleep_on(cqr);
1325         if (!rc)
1326                 /* trigger CIO to reprobe devices */
1327                 css_schedule_reprobe();
1328         dasd_sfree_request(cqr, cqr->memdev);
1329         return rc;
1330 }
1331
1332 /*
1333  * Valide storage server of current device.
1334  */
1335 static void dasd_eckd_validate_server(struct dasd_device *device)
1336 {
1337         int rc;
1338         struct dasd_eckd_private *private;
1339         int enable_pav;
1340
1341         if (dasd_nopav || MACHINE_IS_VM)
1342                 enable_pav = 0;
1343         else
1344                 enable_pav = 1;
1345         rc = dasd_eckd_psf_ssc(device, enable_pav);
1346
1347         /* may be requested feature is not available on server,
1348          * therefore just report error and go ahead */
1349         private = (struct dasd_eckd_private *) device->private;
1350         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1351                         "returned rc=%d", private->uid.ssid, rc);
1352 }
1353
1354 static u32 get_fcx_max_data(struct dasd_device *device)
1355 {
1356 #if defined(CONFIG_64BIT)
1357         int tpm, mdc;
1358         int fcx_in_css, fcx_in_gneq, fcx_in_features;
1359         struct dasd_eckd_private *private;
1360
1361         if (dasd_nofcx)
1362                 return 0;
1363         /* is transport mode supported? */
1364         private = (struct dasd_eckd_private *) device->private;
1365         fcx_in_css = css_general_characteristics.fcx;
1366         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1367         fcx_in_features = private->features.feature[40] & 0x80;
1368         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1369
1370         if (!tpm)
1371                 return 0;
1372
1373         mdc = ccw_device_get_mdc(device->cdev, 0);
1374         if (mdc < 0) {
1375                 dev_warn(&device->cdev->dev, "Detecting the maximum supported"
1376                          " data size for zHPF requests failed\n");
1377                 return 0;
1378         } else
1379                 return mdc * FCX_MAX_DATA_FACTOR;
1380 #else
1381         return 0;
1382 #endif
1383 }
1384
1385 /*
1386  * Check device characteristics.
1387  * If the device is accessible using ECKD discipline, the device is enabled.
1388  */
1389 static int
1390 dasd_eckd_check_characteristics(struct dasd_device *device)
1391 {
1392         struct dasd_eckd_private *private;
1393         struct dasd_block *block;
1394         struct dasd_uid temp_uid;
1395         int is_known, rc, i;
1396         int readonly;
1397         unsigned long value;
1398
1399         if (!ccw_device_is_pathgroup(device->cdev)) {
1400                 dev_warn(&device->cdev->dev,
1401                          "A channel path group could not be established\n");
1402                 return -EIO;
1403         }
1404         if (!ccw_device_is_multipath(device->cdev)) {
1405                 dev_info(&device->cdev->dev,
1406                          "The DASD is not operating in multipath mode\n");
1407         }
1408         private = (struct dasd_eckd_private *) device->private;
1409         if (!private) {
1410                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1411                 if (!private) {
1412                         dev_warn(&device->cdev->dev,
1413                                  "Allocating memory for private DASD data "
1414                                  "failed\n");
1415                         return -ENOMEM;
1416                 }
1417                 device->private = (void *) private;
1418         } else {
1419                 memset(private, 0, sizeof(*private));
1420         }
1421         /* Invalidate status of initial analysis. */
1422         private->init_cqr_status = -1;
1423         /* Set default cache operations. */
1424         private->attrib.operation = DASD_NORMAL_CACHE;
1425         private->attrib.nr_cyl = 0;
1426
1427         /* Read Configuration Data */
1428         rc = dasd_eckd_read_conf(device);
1429         if (rc)
1430                 goto out_err1;
1431
1432         /* set default timeout */
1433         device->default_expires = DASD_EXPIRES;
1434         if (private->gneq) {
1435                 value = 1;
1436                 for (i = 0; i < private->gneq->timeout.value; i++)
1437                         value = 10 * value;
1438                 value = value * private->gneq->timeout.number;
1439                 /* do not accept useless values */
1440                 if (value != 0 && value <= DASD_EXPIRES_MAX)
1441                         device->default_expires = value;
1442         }
1443
1444         /* Generate device unique id */
1445         rc = dasd_eckd_generate_uid(device);
1446         if (rc)
1447                 goto out_err1;
1448
1449         dasd_eckd_get_uid(device, &temp_uid);
1450         if (temp_uid.type == UA_BASE_DEVICE) {
1451                 block = dasd_alloc_block();
1452                 if (IS_ERR(block)) {
1453                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1454                                         "could not allocate dasd "
1455                                         "block structure");
1456                         rc = PTR_ERR(block);
1457                         goto out_err1;
1458                 }
1459                 device->block = block;
1460                 block->base = device;
1461         }
1462
1463         /* register lcu with alias handling, enable PAV if this is a new lcu */
1464         is_known = dasd_alias_make_device_known_to_lcu(device);
1465         if (is_known < 0) {
1466                 rc = is_known;
1467                 goto out_err2;
1468         }
1469         /*
1470          * dasd_eckd_validate_server is done on the first device that
1471          * is found for an LCU. All later other devices have to wait
1472          * for it, so they will read the correct feature codes.
1473          */
1474         if (!is_known) {
1475                 dasd_eckd_validate_server(device);
1476                 dasd_alias_lcu_setup_complete(device);
1477         } else
1478                 dasd_alias_wait_for_lcu_setup(device);
1479
1480         /* device may report different configuration data after LCU setup */
1481         rc = dasd_eckd_read_conf(device);
1482         if (rc)
1483                 goto out_err3;
1484
1485         /* Read Feature Codes */
1486         dasd_eckd_read_features(device);
1487
1488         /* Read Device Characteristics */
1489         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1490                                          &private->rdc_data, 64);
1491         if (rc) {
1492                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1493                                 "Read device characteristic failed, rc=%d", rc);
1494                 goto out_err3;
1495         }
1496
1497         if ((device->features & DASD_FEATURE_USERAW) &&
1498             !(private->rdc_data.facilities.RT_in_LR)) {
1499                 dev_err(&device->cdev->dev, "The storage server does not "
1500                         "support raw-track access\n");
1501                 rc = -EINVAL;
1502                 goto out_err3;
1503         }
1504
1505         /* find the valid cylinder size */
1506         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1507             private->rdc_data.long_no_cyl)
1508                 private->real_cyl = private->rdc_data.long_no_cyl;
1509         else
1510                 private->real_cyl = private->rdc_data.no_cyl;
1511
1512         private->fcx_max_data = get_fcx_max_data(device);
1513
1514         readonly = dasd_device_is_ro(device);
1515         if (readonly)
1516                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1517
1518         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1519                  "with %d cylinders, %d heads, %d sectors%s\n",
1520                  private->rdc_data.dev_type,
1521                  private->rdc_data.dev_model,
1522                  private->rdc_data.cu_type,
1523                  private->rdc_data.cu_model.model,
1524                  private->real_cyl,
1525                  private->rdc_data.trk_per_cyl,
1526                  private->rdc_data.sec_per_trk,
1527                  readonly ? ", read-only device" : "");
1528         return 0;
1529
1530 out_err3:
1531         dasd_alias_disconnect_device_from_lcu(device);
1532 out_err2:
1533         dasd_free_block(device->block);
1534         device->block = NULL;
1535 out_err1:
1536         kfree(private->conf_data);
1537         kfree(device->private);
1538         device->private = NULL;
1539         return rc;
1540 }
1541
1542 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1543 {
1544         struct dasd_eckd_private *private;
1545
1546         private = (struct dasd_eckd_private *) device->private;
1547         dasd_alias_disconnect_device_from_lcu(device);
1548         private->ned = NULL;
1549         private->sneq = NULL;
1550         private->vdsneq = NULL;
1551         private->gneq = NULL;
1552         private->conf_len = 0;
1553         kfree(private->conf_data);
1554         private->conf_data = NULL;
1555 }
1556
1557 static struct dasd_ccw_req *
1558 dasd_eckd_analysis_ccw(struct dasd_device *device)
1559 {
1560         struct dasd_eckd_private *private;
1561         struct eckd_count *count_data;
1562         struct LO_eckd_data *LO_data;
1563         struct dasd_ccw_req *cqr;
1564         struct ccw1 *ccw;
1565         int cplength, datasize;
1566         int i;
1567
1568         private = (struct dasd_eckd_private *) device->private;
1569
1570         cplength = 8;
1571         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1572         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1573         if (IS_ERR(cqr))
1574                 return cqr;
1575         ccw = cqr->cpaddr;
1576         /* Define extent for the first 3 tracks. */
1577         define_extent(ccw++, cqr->data, 0, 2,
1578                       DASD_ECKD_CCW_READ_COUNT, device);
1579         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1580         /* Locate record for the first 4 records on track 0. */
1581         ccw[-1].flags |= CCW_FLAG_CC;
1582         locate_record(ccw++, LO_data++, 0, 0, 4,
1583                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1584
1585         count_data = private->count_area;
1586         for (i = 0; i < 4; i++) {
1587                 ccw[-1].flags |= CCW_FLAG_CC;
1588                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1589                 ccw->flags = 0;
1590                 ccw->count = 8;
1591                 ccw->cda = (__u32)(addr_t) count_data;
1592                 ccw++;
1593                 count_data++;
1594         }
1595
1596         /* Locate record for the first record on track 2. */
1597         ccw[-1].flags |= CCW_FLAG_CC;
1598         locate_record(ccw++, LO_data++, 2, 0, 1,
1599                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1600         /* Read count ccw. */
1601         ccw[-1].flags |= CCW_FLAG_CC;
1602         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1603         ccw->flags = 0;
1604         ccw->count = 8;
1605         ccw->cda = (__u32)(addr_t) count_data;
1606
1607         cqr->block = NULL;
1608         cqr->startdev = device;
1609         cqr->memdev = device;
1610         cqr->retries = 255;
1611         cqr->buildclk = get_clock();
1612         cqr->status = DASD_CQR_FILLED;
1613         return cqr;
1614 }
1615
1616 /* differentiate between 'no record found' and any other error */
1617 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1618 {
1619         char *sense;
1620         if (init_cqr->status == DASD_CQR_DONE)
1621                 return INIT_CQR_OK;
1622         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1623                  init_cqr->status == DASD_CQR_FAILED) {
1624                 sense = dasd_get_sense(&init_cqr->irb);
1625                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1626                         return INIT_CQR_UNFORMATTED;
1627                 else
1628                         return INIT_CQR_ERROR;
1629         } else
1630                 return INIT_CQR_ERROR;
1631 }
1632
1633 /*
1634  * This is the callback function for the init_analysis cqr. It saves
1635  * the status of the initial analysis ccw before it frees it and kicks
1636  * the device to continue the startup sequence. This will call
1637  * dasd_eckd_do_analysis again (if the devices has not been marked
1638  * for deletion in the meantime).
1639  */
1640 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1641                                         void *data)
1642 {
1643         struct dasd_eckd_private *private;
1644         struct dasd_device *device;
1645
1646         device = init_cqr->startdev;
1647         private = (struct dasd_eckd_private *) device->private;
1648         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1649         dasd_sfree_request(init_cqr, device);
1650         dasd_kick_device(device);
1651 }
1652
1653 static int dasd_eckd_start_analysis(struct dasd_block *block)
1654 {
1655         struct dasd_ccw_req *init_cqr;
1656
1657         init_cqr = dasd_eckd_analysis_ccw(block->base);
1658         if (IS_ERR(init_cqr))
1659                 return PTR_ERR(init_cqr);
1660         init_cqr->callback = dasd_eckd_analysis_callback;
1661         init_cqr->callback_data = NULL;
1662         init_cqr->expires = 5*HZ;
1663         /* first try without ERP, so we can later handle unformatted
1664          * devices as special case
1665          */
1666         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1667         init_cqr->retries = 0;
1668         dasd_add_request_head(init_cqr);
1669         return -EAGAIN;
1670 }
1671
1672 static int dasd_eckd_end_analysis(struct dasd_block *block)
1673 {
1674         struct dasd_device *device;
1675         struct dasd_eckd_private *private;
1676         struct eckd_count *count_area;
1677         unsigned int sb, blk_per_trk;
1678         int status, i;
1679         struct dasd_ccw_req *init_cqr;
1680
1681         device = block->base;
1682         private = (struct dasd_eckd_private *) device->private;
1683         status = private->init_cqr_status;
1684         private->init_cqr_status = -1;
1685         if (status == INIT_CQR_ERROR) {
1686                 /* try again, this time with full ERP */
1687                 init_cqr = dasd_eckd_analysis_ccw(device);
1688                 dasd_sleep_on(init_cqr);
1689                 status = dasd_eckd_analysis_evaluation(init_cqr);
1690                 dasd_sfree_request(init_cqr, device);
1691         }
1692
1693         if (device->features & DASD_FEATURE_USERAW) {
1694                 block->bp_block = DASD_RAW_BLOCKSIZE;
1695                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1696                 block->s2b_shift = 3;
1697                 goto raw;
1698         }
1699
1700         if (status == INIT_CQR_UNFORMATTED) {
1701                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1702                 return -EMEDIUMTYPE;
1703         } else if (status == INIT_CQR_ERROR) {
1704                 dev_err(&device->cdev->dev,
1705                         "Detecting the DASD disk layout failed because "
1706                         "of an I/O error\n");
1707                 return -EIO;
1708         }
1709
1710         private->uses_cdl = 1;
1711         /* Check Track 0 for Compatible Disk Layout */
1712         count_area = NULL;
1713         for (i = 0; i < 3; i++) {
1714                 if (private->count_area[i].kl != 4 ||
1715                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
1716                         private->uses_cdl = 0;
1717                         break;
1718                 }
1719         }
1720         if (i == 3)
1721                 count_area = &private->count_area[4];
1722
1723         if (private->uses_cdl == 0) {
1724                 for (i = 0; i < 5; i++) {
1725                         if ((private->count_area[i].kl != 0) ||
1726                             (private->count_area[i].dl !=
1727                              private->count_area[0].dl))
1728                                 break;
1729                 }
1730                 if (i == 5)
1731                         count_area = &private->count_area[0];
1732         } else {
1733                 if (private->count_area[3].record == 1)
1734                         dev_warn(&device->cdev->dev,
1735                                  "Track 0 has no records following the VTOC\n");
1736         }
1737
1738         if (count_area != NULL && count_area->kl == 0) {
1739                 /* we found notthing violating our disk layout */
1740                 if (dasd_check_blocksize(count_area->dl) == 0)
1741                         block->bp_block = count_area->dl;
1742         }
1743         if (block->bp_block == 0) {
1744                 dev_warn(&device->cdev->dev,
1745                          "The disk layout of the DASD is not supported\n");
1746                 return -EMEDIUMTYPE;
1747         }
1748         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1749         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1750                 block->s2b_shift++;
1751
1752         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1753
1754 raw:
1755         block->blocks = (private->real_cyl *
1756                           private->rdc_data.trk_per_cyl *
1757                           blk_per_trk);
1758
1759         dev_info(&device->cdev->dev,
1760                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
1761                  "%s\n", (block->bp_block >> 10),
1762                  ((private->real_cyl *
1763                    private->rdc_data.trk_per_cyl *
1764                    blk_per_trk * (block->bp_block >> 9)) >> 1),
1765                  ((blk_per_trk * block->bp_block) >> 10),
1766                  private->uses_cdl ?
1767                  "compatible disk layout" : "linux disk layout");
1768
1769         return 0;
1770 }
1771
1772 static int dasd_eckd_do_analysis(struct dasd_block *block)
1773 {
1774         struct dasd_eckd_private *private;
1775
1776         private = (struct dasd_eckd_private *) block->base->private;
1777         if (private->init_cqr_status < 0)
1778                 return dasd_eckd_start_analysis(block);
1779         else
1780                 return dasd_eckd_end_analysis(block);
1781 }
1782
1783 static int dasd_eckd_ready_to_online(struct dasd_device *device)
1784 {
1785         return dasd_alias_add_device(device);
1786 };
1787
1788 static int dasd_eckd_online_to_ready(struct dasd_device *device)
1789 {
1790         cancel_work_sync(&device->reload_device);
1791         return dasd_alias_remove_device(device);
1792 };
1793
1794 static int
1795 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
1796 {
1797         struct dasd_eckd_private *private;
1798
1799         private = (struct dasd_eckd_private *) block->base->private;
1800         if (dasd_check_blocksize(block->bp_block) == 0) {
1801                 geo->sectors = recs_per_track(&private->rdc_data,
1802                                               0, block->bp_block);
1803         }
1804         geo->cylinders = private->rdc_data.no_cyl;
1805         geo->heads = private->rdc_data.trk_per_cyl;
1806         return 0;
1807 }
1808
1809 static struct dasd_ccw_req *
1810 dasd_eckd_format_device(struct dasd_device * device,
1811                         struct format_data_t * fdata)
1812 {
1813         struct dasd_eckd_private *private;
1814         struct dasd_ccw_req *fcp;
1815         struct eckd_count *ect;
1816         struct ccw1 *ccw;
1817         void *data;
1818         int rpt;
1819         struct ch_t address;
1820         int cplength, datasize;
1821         int i;
1822         int intensity = 0;
1823         int r0_perm;
1824
1825         private = (struct dasd_eckd_private *) device->private;
1826         rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
1827         set_ch_t(&address,
1828                  fdata->start_unit / private->rdc_data.trk_per_cyl,
1829                  fdata->start_unit % private->rdc_data.trk_per_cyl);
1830
1831         /* Sanity checks. */
1832         if (fdata->start_unit >=
1833             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
1834                 dev_warn(&device->cdev->dev, "Start track number %d used in "
1835                          "formatting is too big\n", fdata->start_unit);
1836                 return ERR_PTR(-EINVAL);
1837         }
1838         if (fdata->start_unit > fdata->stop_unit) {
1839                 dev_warn(&device->cdev->dev, "Start track %d used in "
1840                          "formatting exceeds end track\n", fdata->start_unit);
1841                 return ERR_PTR(-EINVAL);
1842         }
1843         if (dasd_check_blocksize(fdata->blksize) != 0) {
1844                 dev_warn(&device->cdev->dev,
1845                          "The DASD cannot be formatted with block size %d\n",
1846                          fdata->blksize);
1847                 return ERR_PTR(-EINVAL);
1848         }
1849
1850         /*
1851          * fdata->intensity is a bit string that tells us what to do:
1852          *   Bit 0: write record zero
1853          *   Bit 1: write home address, currently not supported
1854          *   Bit 2: invalidate tracks
1855          *   Bit 3: use OS/390 compatible disk layout (cdl)
1856          *   Bit 4: do not allow storage subsystem to modify record zero
1857          * Only some bit combinations do make sense.
1858          */
1859         if (fdata->intensity & 0x10) {
1860                 r0_perm = 0;
1861                 intensity = fdata->intensity & ~0x10;
1862         } else {
1863                 r0_perm = 1;
1864                 intensity = fdata->intensity;
1865         }
1866         switch (intensity) {
1867         case 0x00:      /* Normal format */
1868         case 0x08:      /* Normal format, use cdl. */
1869                 cplength = 2 + rpt;
1870                 datasize = sizeof(struct DE_eckd_data) +
1871                         sizeof(struct LO_eckd_data) +
1872                         rpt * sizeof(struct eckd_count);
1873                 break;
1874         case 0x01:      /* Write record zero and format track. */
1875         case 0x09:      /* Write record zero and format track, use cdl. */
1876                 cplength = 3 + rpt;
1877                 datasize = sizeof(struct DE_eckd_data) +
1878                         sizeof(struct LO_eckd_data) +
1879                         sizeof(struct eckd_count) +
1880                         rpt * sizeof(struct eckd_count);
1881                 break;
1882         case 0x04:      /* Invalidate track. */
1883         case 0x0c:      /* Invalidate track, use cdl. */
1884                 cplength = 3;
1885                 datasize = sizeof(struct DE_eckd_data) +
1886                         sizeof(struct LO_eckd_data) +
1887                         sizeof(struct eckd_count);
1888                 break;
1889         default:
1890                 dev_warn(&device->cdev->dev, "An I/O control call used "
1891                          "incorrect flags 0x%x\n", fdata->intensity);
1892                 return ERR_PTR(-EINVAL);
1893         }
1894         /* Allocate the format ccw request. */
1895         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1896         if (IS_ERR(fcp))
1897                 return fcp;
1898
1899         data = fcp->data;
1900         ccw = fcp->cpaddr;
1901
1902         switch (intensity & ~0x08) {
1903         case 0x00: /* Normal format. */
1904                 define_extent(ccw++, (struct DE_eckd_data *) data,
1905                               fdata->start_unit, fdata->start_unit,
1906                               DASD_ECKD_CCW_WRITE_CKD, device);
1907                 /* grant subsystem permission to format R0 */
1908                 if (r0_perm)
1909                         ((struct DE_eckd_data *)data)->ga_extended |= 0x04;
1910                 data += sizeof(struct DE_eckd_data);
1911                 ccw[-1].flags |= CCW_FLAG_CC;
1912                 locate_record(ccw++, (struct LO_eckd_data *) data,
1913                               fdata->start_unit, 0, rpt,
1914                               DASD_ECKD_CCW_WRITE_CKD, device,
1915                               fdata->blksize);
1916                 data += sizeof(struct LO_eckd_data);
1917                 break;
1918         case 0x01: /* Write record zero + format track. */
1919                 define_extent(ccw++, (struct DE_eckd_data *) data,
1920                               fdata->start_unit, fdata->start_unit,
1921                               DASD_ECKD_CCW_WRITE_RECORD_ZERO,
1922                               device);
1923                 data += sizeof(struct DE_eckd_data);
1924                 ccw[-1].flags |= CCW_FLAG_CC;
1925                 locate_record(ccw++, (struct LO_eckd_data *) data,
1926                               fdata->start_unit, 0, rpt + 1,
1927                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
1928                               device->block->bp_block);
1929                 data += sizeof(struct LO_eckd_data);
1930                 break;
1931         case 0x04: /* Invalidate track. */
1932                 define_extent(ccw++, (struct DE_eckd_data *) data,
1933                               fdata->start_unit, fdata->start_unit,
1934                               DASD_ECKD_CCW_WRITE_CKD, device);
1935                 data += sizeof(struct DE_eckd_data);
1936                 ccw[-1].flags |= CCW_FLAG_CC;
1937                 locate_record(ccw++, (struct LO_eckd_data *) data,
1938                               fdata->start_unit, 0, 1,
1939                               DASD_ECKD_CCW_WRITE_CKD, device, 8);
1940                 data += sizeof(struct LO_eckd_data);
1941                 break;
1942         }
1943         if (intensity & 0x01) { /* write record zero */
1944                 ect = (struct eckd_count *) data;
1945                 data += sizeof(struct eckd_count);
1946                 ect->cyl = address.cyl;
1947                 ect->head = address.head;
1948                 ect->record = 0;
1949                 ect->kl = 0;
1950                 ect->dl = 8;
1951                 ccw[-1].flags |= CCW_FLAG_CC;
1952                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
1953                 ccw->flags = CCW_FLAG_SLI;
1954                 ccw->count = 8;
1955                 ccw->cda = (__u32)(addr_t) ect;
1956                 ccw++;
1957         }
1958         if ((intensity & ~0x08) & 0x04) {       /* erase track */
1959                 ect = (struct eckd_count *) data;
1960                 data += sizeof(struct eckd_count);
1961                 ect->cyl = address.cyl;
1962                 ect->head = address.head;
1963                 ect->record = 1;
1964                 ect->kl = 0;
1965                 ect->dl = 0;
1966                 ccw[-1].flags |= CCW_FLAG_CC;
1967                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1968                 ccw->flags = CCW_FLAG_SLI;
1969                 ccw->count = 8;
1970                 ccw->cda = (__u32)(addr_t) ect;
1971         } else {                /* write remaining records */
1972                 for (i = 0; i < rpt; i++) {
1973                         ect = (struct eckd_count *) data;
1974                         data += sizeof(struct eckd_count);
1975                         ect->cyl = address.cyl;
1976                         ect->head = address.head;
1977                         ect->record = i + 1;
1978                         ect->kl = 0;
1979                         ect->dl = fdata->blksize;
1980                         /* Check for special tracks 0-1 when formatting CDL */
1981                         if ((intensity & 0x08) &&
1982                             fdata->start_unit == 0) {
1983                                 if (i < 3) {
1984                                         ect->kl = 4;
1985                                         ect->dl = sizes_trk0[i] - 4;
1986                                 }
1987                         }
1988                         if ((intensity & 0x08) &&
1989                             fdata->start_unit == 1) {
1990                                 ect->kl = 44;
1991                                 ect->dl = LABEL_SIZE - 44;
1992                         }
1993                         ccw[-1].flags |= CCW_FLAG_CC;
1994                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1995                         ccw->flags = CCW_FLAG_SLI;
1996                         ccw->count = 8;
1997                         ccw->cda = (__u32)(addr_t) ect;
1998                         ccw++;
1999                 }
2000         }
2001         fcp->startdev = device;
2002         fcp->memdev = device;
2003         fcp->retries = 256;
2004         fcp->buildclk = get_clock();
2005         fcp->status = DASD_CQR_FILLED;
2006         return fcp;
2007 }
2008
2009 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2010 {
2011         cqr->status = DASD_CQR_FILLED;
2012         if (cqr->block && (cqr->startdev != cqr->block->base)) {
2013                 dasd_eckd_reset_ccw_to_base_io(cqr);
2014                 cqr->startdev = cqr->block->base;
2015                 cqr->lpm = cqr->block->base->path_data.opm;
2016         }
2017 };
2018
2019 static dasd_erp_fn_t
2020 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2021 {
2022         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2023         struct ccw_device *cdev = device->cdev;
2024
2025         switch (cdev->id.cu_type) {
2026         case 0x3990:
2027         case 0x2105:
2028         case 0x2107:
2029         case 0x1750:
2030                 return dasd_3990_erp_action;
2031         case 0x9343:
2032         case 0x3880:
2033         default:
2034                 return dasd_default_erp_action;
2035         }
2036 }
2037
2038 static dasd_erp_fn_t
2039 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2040 {
2041         return dasd_default_erp_postaction;
2042 }
2043
2044 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2045                                               struct dasd_ccw_req *cqr,
2046                                               struct irb *irb)
2047 {
2048         char mask;
2049         char *sense = NULL;
2050         struct dasd_eckd_private *private;
2051
2052         private = (struct dasd_eckd_private *) device->private;
2053         /* first of all check for state change pending interrupt */
2054         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2055         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2056                 /*
2057                  * for alias only, not in offline processing
2058                  * and only if not suspended
2059                  */
2060                 if (!device->block && private->lcu &&
2061                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2062                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2063                         /*
2064                          * the state change could be caused by an alias
2065                          * reassignment remove device from alias handling
2066                          * to prevent new requests from being scheduled on
2067                          * the wrong alias device
2068                          */
2069                         dasd_alias_remove_device(device);
2070
2071                         /* schedule worker to reload device */
2072                         dasd_reload_device(device);
2073                 }
2074                 dasd_generic_handle_state_change(device);
2075                 return;
2076         }
2077
2078         sense = dasd_get_sense(irb);
2079         if (!sense)
2080                 return;
2081
2082         /* summary unit check */
2083         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2084             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2085                 dasd_alias_handle_summary_unit_check(device, irb);
2086                 return;
2087         }
2088
2089         /* service information message SIM */
2090         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
2091             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
2092                 dasd_3990_erp_handle_sim(device, sense);
2093                 return;
2094         }
2095
2096         /* loss of device reservation is handled via base devices only
2097          * as alias devices may be used with several bases
2098          */
2099         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
2100             (sense[7] == 0x3F) &&
2101             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
2102             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
2103                 if (device->features & DASD_FEATURE_FAILONSLCK)
2104                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
2105                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
2106                 dev_err(&device->cdev->dev,
2107                         "The device reservation was lost\n");
2108         }
2109 }
2110
2111 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
2112                                                struct dasd_device *startdev,
2113                                                struct dasd_block *block,
2114                                                struct request *req,
2115                                                sector_t first_rec,
2116                                                sector_t last_rec,
2117                                                sector_t first_trk,
2118                                                sector_t last_trk,
2119                                                unsigned int first_offs,
2120                                                unsigned int last_offs,
2121                                                unsigned int blk_per_trk,
2122                                                unsigned int blksize)
2123 {
2124         struct dasd_eckd_private *private;
2125         unsigned long *idaws;
2126         struct LO_eckd_data *LO_data;
2127         struct dasd_ccw_req *cqr;
2128         struct ccw1 *ccw;
2129         struct req_iterator iter;
2130         struct bio_vec *bv;
2131         char *dst;
2132         unsigned int off;
2133         int count, cidaw, cplength, datasize;
2134         sector_t recid;
2135         unsigned char cmd, rcmd;
2136         int use_prefix;
2137         struct dasd_device *basedev;
2138
2139         basedev = block->base;
2140         private = (struct dasd_eckd_private *) basedev->private;
2141         if (rq_data_dir(req) == READ)
2142                 cmd = DASD_ECKD_CCW_READ_MT;
2143         else if (rq_data_dir(req) == WRITE)
2144                 cmd = DASD_ECKD_CCW_WRITE_MT;
2145         else
2146                 return ERR_PTR(-EINVAL);
2147
2148         /* Check struct bio and count the number of blocks for the request. */
2149         count = 0;
2150         cidaw = 0;
2151         rq_for_each_segment(bv, req, iter) {
2152                 if (bv->bv_len & (blksize - 1))
2153                         /* Eckd can only do full blocks. */
2154                         return ERR_PTR(-EINVAL);
2155                 count += bv->bv_len >> (block->s2b_shift + 9);
2156 #if defined(CONFIG_64BIT)
2157                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
2158                         cidaw += bv->bv_len >> (block->s2b_shift + 9);
2159 #endif
2160         }
2161         /* Paranoia. */
2162         if (count != last_rec - first_rec + 1)
2163                 return ERR_PTR(-EINVAL);
2164
2165         /* use the prefix command if available */
2166         use_prefix = private->features.feature[8] & 0x01;
2167         if (use_prefix) {
2168                 /* 1x prefix + number of blocks */
2169                 cplength = 2 + count;
2170                 /* 1x prefix + cidaws*sizeof(long) */
2171                 datasize = sizeof(struct PFX_eckd_data) +
2172                         sizeof(struct LO_eckd_data) +
2173                         cidaw * sizeof(unsigned long);
2174         } else {
2175                 /* 1x define extent + 1x locate record + number of blocks */
2176                 cplength = 2 + count;
2177                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
2178                 datasize = sizeof(struct DE_eckd_data) +
2179                         sizeof(struct LO_eckd_data) +
2180                         cidaw * sizeof(unsigned long);
2181         }
2182         /* Find out the number of additional locate record ccws for cdl. */
2183         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
2184                 if (last_rec >= 2*blk_per_trk)
2185                         count = 2*blk_per_trk - first_rec;
2186                 cplength += count;
2187                 datasize += count*sizeof(struct LO_eckd_data);
2188         }
2189         /* Allocate the ccw request. */
2190         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2191                                    startdev);
2192         if (IS_ERR(cqr))
2193                 return cqr;
2194         ccw = cqr->cpaddr;
2195         /* First ccw is define extent or prefix. */
2196         if (use_prefix) {
2197                 if (prefix(ccw++, cqr->data, first_trk,
2198                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
2199                         /* Clock not in sync and XRC is enabled.
2200                          * Try again later.
2201                          */
2202                         dasd_sfree_request(cqr, startdev);
2203                         return ERR_PTR(-EAGAIN);
2204                 }
2205                 idaws = (unsigned long *) (cqr->data +
2206                                            sizeof(struct PFX_eckd_data));
2207         } else {
2208                 if (define_extent(ccw++, cqr->data, first_trk,
2209                                   last_trk, cmd, startdev) == -EAGAIN) {
2210                         /* Clock not in sync and XRC is enabled.
2211                          * Try again later.
2212                          */
2213                         dasd_sfree_request(cqr, startdev);
2214                         return ERR_PTR(-EAGAIN);
2215                 }
2216                 idaws = (unsigned long *) (cqr->data +
2217                                            sizeof(struct DE_eckd_data));
2218         }
2219         /* Build locate_record+read/write/ccws. */
2220         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
2221         recid = first_rec;
2222         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
2223                 /* Only standard blocks so there is just one locate record. */
2224                 ccw[-1].flags |= CCW_FLAG_CC;
2225                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
2226                               last_rec - recid + 1, cmd, basedev, blksize);
2227         }
2228         rq_for_each_segment(bv, req, iter) {
2229                 dst = page_address(bv->bv_page) + bv->bv_offset;
2230                 if (dasd_page_cache) {
2231                         char *copy = kmem_cache_alloc(dasd_page_cache,
2232                                                       GFP_DMA | __GFP_NOWARN);
2233                         if (copy && rq_data_dir(req) == WRITE)
2234                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
2235                         if (copy)
2236                                 dst = copy + bv->bv_offset;
2237                 }
2238                 for (off = 0; off < bv->bv_len; off += blksize) {
2239                         sector_t trkid = recid;
2240                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
2241                         rcmd = cmd;
2242                         count = blksize;
2243                         /* Locate record for cdl special block ? */
2244                         if (private->uses_cdl && recid < 2*blk_per_trk) {
2245                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
2246                                         rcmd |= 0x8;
2247                                         count = dasd_eckd_cdl_reclen(recid);
2248                                         if (count < blksize &&
2249                                             rq_data_dir(req) == READ)
2250                                                 memset(dst + count, 0xe5,
2251                                                        blksize - count);
2252                                 }
2253                                 ccw[-1].flags |= CCW_FLAG_CC;
2254                                 locate_record(ccw++, LO_data++,
2255                                               trkid, recoffs + 1,
2256                                               1, rcmd, basedev, count);
2257                         }
2258                         /* Locate record for standard blocks ? */
2259                         if (private->uses_cdl && recid == 2*blk_per_trk) {
2260                                 ccw[-1].flags |= CCW_FLAG_CC;
2261                                 locate_record(ccw++, LO_data++,
2262                                               trkid, recoffs + 1,
2263                                               last_rec - recid + 1,
2264                                               cmd, basedev, count);
2265                         }
2266                         /* Read/write ccw. */
2267                         ccw[-1].flags |= CCW_FLAG_CC;
2268                         ccw->cmd_code = rcmd;
2269                         ccw->count = count;
2270                         if (idal_is_needed(dst, blksize)) {
2271                                 ccw->cda = (__u32)(addr_t) idaws;
2272                                 ccw->flags = CCW_FLAG_IDA;
2273                                 idaws = idal_create_words(idaws, dst, blksize);
2274                         } else {
2275                                 ccw->cda = (__u32)(addr_t) dst;
2276                                 ccw->flags = 0;
2277                         }
2278                         ccw++;
2279                         dst += blksize;
2280                         recid++;
2281                 }
2282         }
2283         if (blk_noretry_request(req) ||
2284             block->base->features & DASD_FEATURE_FAILFAST)
2285                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2286         cqr->startdev = startdev;
2287         cqr->memdev = startdev;
2288         cqr->block = block;
2289         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2290         cqr->lpm = startdev->path_data.ppm;
2291         cqr->retries = 256;
2292         cqr->buildclk = get_clock();
2293         cqr->status = DASD_CQR_FILLED;
2294         return cqr;
2295 }
2296
2297 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
2298                                                struct dasd_device *startdev,
2299                                                struct dasd_block *block,
2300                                                struct request *req,
2301                                                sector_t first_rec,
2302                                                sector_t last_rec,
2303                                                sector_t first_trk,
2304                                                sector_t last_trk,
2305                                                unsigned int first_offs,
2306                                                unsigned int last_offs,
2307                                                unsigned int blk_per_trk,
2308                                                unsigned int blksize)
2309 {
2310         unsigned long *idaws;
2311         struct dasd_ccw_req *cqr;
2312         struct ccw1 *ccw;
2313         struct req_iterator iter;
2314         struct bio_vec *bv;
2315         char *dst, *idaw_dst;
2316         unsigned int cidaw, cplength, datasize;
2317         unsigned int tlf;
2318         sector_t recid;
2319         unsigned char cmd;
2320         struct dasd_device *basedev;
2321         unsigned int trkcount, count, count_to_trk_end;
2322         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
2323         unsigned char new_track, end_idaw;
2324         sector_t trkid;
2325         unsigned int recoffs;
2326
2327         basedev = block->base;
2328         if (rq_data_dir(req) == READ)
2329                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2330         else if (rq_data_dir(req) == WRITE)
2331                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2332         else
2333                 return ERR_PTR(-EINVAL);
2334
2335         /* Track based I/O needs IDAWs for each page, and not just for
2336          * 64 bit addresses. We need additional idals for pages
2337          * that get filled from two tracks, so we use the number
2338          * of records as upper limit.
2339          */
2340         cidaw = last_rec - first_rec + 1;
2341         trkcount = last_trk - first_trk + 1;
2342
2343         /* 1x prefix + one read/write ccw per track */
2344         cplength = 1 + trkcount;
2345
2346         /* on 31-bit we need space for two 32 bit addresses per page
2347          * on 64-bit one 64 bit address
2348          */
2349         datasize = sizeof(struct PFX_eckd_data) +
2350                 cidaw * sizeof(unsigned long long);
2351
2352         /* Allocate the ccw request. */
2353         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2354                                    startdev);
2355         if (IS_ERR(cqr))
2356                 return cqr;
2357         ccw = cqr->cpaddr;
2358         /* transfer length factor: how many bytes to read from the last track */
2359         if (first_trk == last_trk)
2360                 tlf = last_offs - first_offs + 1;
2361         else
2362                 tlf = last_offs + 1;
2363         tlf *= blksize;
2364
2365         if (prefix_LRE(ccw++, cqr->data, first_trk,
2366                        last_trk, cmd, basedev, startdev,
2367                        1 /* format */, first_offs + 1,
2368                        trkcount, blksize,
2369                        tlf) == -EAGAIN) {
2370                 /* Clock not in sync and XRC is enabled.
2371                  * Try again later.
2372                  */
2373                 dasd_sfree_request(cqr, startdev);
2374                 return ERR_PTR(-EAGAIN);
2375         }
2376
2377         /*
2378          * The translation of request into ccw programs must meet the
2379          * following conditions:
2380          * - all idaws but the first and the last must address full pages
2381          *   (or 2K blocks on 31-bit)
2382          * - the scope of a ccw and it's idal ends with the track boundaries
2383          */
2384         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2385         recid = first_rec;
2386         new_track = 1;
2387         end_idaw = 0;
2388         len_to_track_end = 0;
2389         idaw_dst = 0;
2390         idaw_len = 0;
2391         rq_for_each_segment(bv, req, iter) {
2392                 dst = page_address(bv->bv_page) + bv->bv_offset;
2393                 seg_len = bv->bv_len;
2394                 while (seg_len) {
2395                         if (new_track) {
2396                                 trkid = recid;
2397                                 recoffs = sector_div(trkid, blk_per_trk);
2398                                 count_to_trk_end = blk_per_trk - recoffs;
2399                                 count = min((last_rec - recid + 1),
2400                                             (sector_t)count_to_trk_end);
2401                                 len_to_track_end = count * blksize;
2402                                 ccw[-1].flags |= CCW_FLAG_CC;
2403                                 ccw->cmd_code = cmd;
2404                                 ccw->count = len_to_track_end;
2405                                 ccw->cda = (__u32)(addr_t)idaws;
2406                                 ccw->flags = CCW_FLAG_IDA;
2407                                 ccw++;
2408                                 recid += count;
2409                                 new_track = 0;
2410                                 /* first idaw for a ccw may start anywhere */
2411                                 if (!idaw_dst)
2412                                         idaw_dst = dst;
2413                         }
2414                         /* If we start a new idaw, we must make sure that it
2415                          * starts on an IDA_BLOCK_SIZE boundary.
2416                          * If we continue an idaw, we must make sure that the
2417                          * current segment begins where the so far accumulated
2418                          * idaw ends
2419                          */
2420                         if (!idaw_dst) {
2421                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2422                                         dasd_sfree_request(cqr, startdev);
2423                                         return ERR_PTR(-ERANGE);
2424                                 } else
2425                                         idaw_dst = dst;
2426                         }
2427                         if ((idaw_dst + idaw_len) != dst) {
2428                                 dasd_sfree_request(cqr, startdev);
2429                                 return ERR_PTR(-ERANGE);
2430                         }
2431                         part_len = min(seg_len, len_to_track_end);
2432                         seg_len -= part_len;
2433                         dst += part_len;
2434                         idaw_len += part_len;
2435                         len_to_track_end -= part_len;
2436                         /* collected memory area ends on an IDA_BLOCK border,
2437                          * -> create an idaw
2438                          * idal_create_words will handle cases where idaw_len
2439                          * is larger then IDA_BLOCK_SIZE
2440                          */
2441                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2442                                 end_idaw = 1;
2443                         /* We also need to end the idaw at track end */
2444                         if (!len_to_track_end) {
2445                                 new_track = 1;
2446                                 end_idaw = 1;
2447                         }
2448                         if (end_idaw) {
2449                                 idaws = idal_create_words(idaws, idaw_dst,
2450                                                           idaw_len);
2451                                 idaw_dst = 0;
2452                                 idaw_len = 0;
2453                                 end_idaw = 0;
2454                         }
2455                 }
2456         }
2457
2458         if (blk_noretry_request(req) ||
2459             block->base->features & DASD_FEATURE_FAILFAST)
2460                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2461         cqr->startdev = startdev;
2462         cqr->memdev = startdev;
2463         cqr->block = block;
2464         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2465         cqr->lpm = startdev->path_data.ppm;
2466         cqr->retries = 256;
2467         cqr->buildclk = get_clock();
2468         cqr->status = DASD_CQR_FILLED;
2469         return cqr;
2470 }
2471
2472 static int prepare_itcw(struct itcw *itcw,
2473                         unsigned int trk, unsigned int totrk, int cmd,
2474                         struct dasd_device *basedev,
2475                         struct dasd_device *startdev,
2476                         unsigned int rec_on_trk, int count,
2477                         unsigned int blksize,
2478                         unsigned int total_data_size,
2479                         unsigned int tlf,
2480                         unsigned int blk_per_trk)
2481 {
2482         struct PFX_eckd_data pfxdata;
2483         struct dasd_eckd_private *basepriv, *startpriv;
2484         struct DE_eckd_data *dedata;
2485         struct LRE_eckd_data *lredata;
2486         struct dcw *dcw;
2487
2488         u32 begcyl, endcyl;
2489         u16 heads, beghead, endhead;
2490         u8 pfx_cmd;
2491
2492         int rc = 0;
2493         int sector = 0;
2494         int dn, d;
2495
2496
2497         /* setup prefix data */
2498         basepriv = (struct dasd_eckd_private *) basedev->private;
2499         startpriv = (struct dasd_eckd_private *) startdev->private;
2500         dedata = &pfxdata.define_extent;
2501         lredata = &pfxdata.locate_record;
2502
2503         memset(&pfxdata, 0, sizeof(pfxdata));
2504         pfxdata.format = 1; /* PFX with LRE */
2505         pfxdata.base_address = basepriv->ned->unit_addr;
2506         pfxdata.base_lss = basepriv->ned->ID;
2507         pfxdata.validity.define_extent = 1;
2508
2509         /* private uid is kept up to date, conf_data may be outdated */
2510         if (startpriv->uid.type != UA_BASE_DEVICE) {
2511                 pfxdata.validity.verify_base = 1;
2512                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2513                         pfxdata.validity.hyper_pav = 1;
2514         }
2515
2516         switch (cmd) {
2517         case DASD_ECKD_CCW_READ_TRACK_DATA:
2518                 dedata->mask.perm = 0x1;
2519                 dedata->attributes.operation = basepriv->attrib.operation;
2520                 dedata->blk_size = blksize;
2521                 dedata->ga_extended |= 0x42;
2522                 lredata->operation.orientation = 0x0;
2523                 lredata->operation.operation = 0x0C;
2524                 lredata->auxiliary.check_bytes = 0x01;
2525                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2526                 break;
2527         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2528                 dedata->mask.perm = 0x02;
2529                 dedata->attributes.operation = basepriv->attrib.operation;
2530                 dedata->blk_size = blksize;
2531                 rc = check_XRC_on_prefix(&pfxdata, basedev);
2532                 dedata->ga_extended |= 0x42;
2533                 lredata->operation.orientation = 0x0;
2534                 lredata->operation.operation = 0x3F;
2535                 lredata->extended_operation = 0x23;
2536                 lredata->auxiliary.check_bytes = 0x2;
2537                 pfx_cmd = DASD_ECKD_CCW_PFX;
2538                 break;
2539         default:
2540                 DBF_DEV_EVENT(DBF_ERR, basedev,
2541                               "prepare itcw, unknown opcode 0x%x", cmd);
2542                 BUG();
2543                 break;
2544         }
2545         if (rc)
2546                 return rc;
2547
2548         dedata->attributes.mode = 0x3;  /* ECKD */
2549
2550         heads = basepriv->rdc_data.trk_per_cyl;
2551         begcyl = trk / heads;
2552         beghead = trk % heads;
2553         endcyl = totrk / heads;
2554         endhead = totrk % heads;
2555
2556         /* check for sequential prestage - enhance cylinder range */
2557         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2558             dedata->attributes.operation == DASD_SEQ_ACCESS) {
2559
2560                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2561                         endcyl += basepriv->attrib.nr_cyl;
2562                 else
2563                         endcyl = (basepriv->real_cyl - 1);
2564         }
2565
2566         set_ch_t(&dedata->beg_ext, begcyl, beghead);
2567         set_ch_t(&dedata->end_ext, endcyl, endhead);
2568
2569         dedata->ep_format = 0x20; /* records per track is valid */
2570         dedata->ep_rec_per_track = blk_per_trk;
2571
2572         if (rec_on_trk) {
2573                 switch (basepriv->rdc_data.dev_type) {
2574                 case 0x3390:
2575                         dn = ceil_quot(blksize + 6, 232);
2576                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
2577                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
2578                         break;
2579                 case 0x3380:
2580                         d = 7 + ceil_quot(blksize + 12, 32);
2581                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
2582                         break;
2583                 }
2584         }
2585
2586         lredata->auxiliary.length_valid = 1;
2587         lredata->auxiliary.length_scope = 1;
2588         lredata->auxiliary.imbedded_ccw_valid = 1;
2589         lredata->length = tlf;
2590         lredata->imbedded_ccw = cmd;
2591         lredata->count = count;
2592         lredata->sector = sector;
2593         set_ch_t(&lredata->seek_addr, begcyl, beghead);
2594         lredata->search_arg.cyl = lredata->seek_addr.cyl;
2595         lredata->search_arg.head = lredata->seek_addr.head;
2596         lredata->search_arg.record = rec_on_trk;
2597
2598         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
2599                      &pfxdata, sizeof(pfxdata), total_data_size);
2600         return IS_ERR(dcw) ? PTR_ERR(dcw) : 0;
2601 }
2602
2603 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
2604                                                struct dasd_device *startdev,
2605                                                struct dasd_block *block,
2606                                                struct request *req,
2607                                                sector_t first_rec,
2608                                                sector_t last_rec,
2609                                                sector_t first_trk,
2610                                                sector_t last_trk,
2611                                                unsigned int first_offs,
2612                                                unsigned int last_offs,
2613                                                unsigned int blk_per_trk,
2614                                                unsigned int blksize)
2615 {
2616         struct dasd_ccw_req *cqr;
2617         struct req_iterator iter;
2618         struct bio_vec *bv;
2619         char *dst;
2620         unsigned int trkcount, ctidaw;
2621         unsigned char cmd;
2622         struct dasd_device *basedev;
2623         unsigned int tlf;
2624         struct itcw *itcw;
2625         struct tidaw *last_tidaw = NULL;
2626         int itcw_op;
2627         size_t itcw_size;
2628         u8 tidaw_flags;
2629         unsigned int seg_len, part_len, len_to_track_end;
2630         unsigned char new_track;
2631         sector_t recid, trkid;
2632         unsigned int offs;
2633         unsigned int count, count_to_trk_end;
2634
2635         basedev = block->base;
2636         if (rq_data_dir(req) == READ) {
2637                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2638                 itcw_op = ITCW_OP_READ;
2639         } else if (rq_data_dir(req) == WRITE) {
2640                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2641                 itcw_op = ITCW_OP_WRITE;
2642         } else
2643                 return ERR_PTR(-EINVAL);
2644
2645         /* trackbased I/O needs address all memory via TIDAWs,
2646          * not just for 64 bit addresses. This allows us to map
2647          * each segment directly to one tidaw.
2648          * In the case of write requests, additional tidaws may
2649          * be needed when a segment crosses a track boundary.
2650          */
2651         trkcount = last_trk - first_trk + 1;
2652         ctidaw = 0;
2653         rq_for_each_segment(bv, req, iter) {
2654                 ++ctidaw;
2655         }
2656         if (rq_data_dir(req) == WRITE)
2657                 ctidaw += (last_trk - first_trk);
2658
2659         /* Allocate the ccw request. */
2660         itcw_size = itcw_calc_size(0, ctidaw, 0);
2661         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2662         if (IS_ERR(cqr))
2663                 return cqr;
2664
2665         /* transfer length factor: how many bytes to read from the last track */
2666         if (first_trk == last_trk)
2667                 tlf = last_offs - first_offs + 1;
2668         else
2669                 tlf = last_offs + 1;
2670         tlf *= blksize;
2671
2672         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
2673         if (IS_ERR(itcw)) {
2674                 dasd_sfree_request(cqr, startdev);
2675                 return ERR_PTR(-EINVAL);
2676         }
2677         cqr->cpaddr = itcw_get_tcw(itcw);
2678         if (prepare_itcw(itcw, first_trk, last_trk,
2679                          cmd, basedev, startdev,
2680                          first_offs + 1,
2681                          trkcount, blksize,
2682                          (last_rec - first_rec + 1) * blksize,
2683                          tlf, blk_per_trk) == -EAGAIN) {
2684                 /* Clock not in sync and XRC is enabled.
2685                  * Try again later.
2686                  */
2687                 dasd_sfree_request(cqr, startdev);
2688                 return ERR_PTR(-EAGAIN);
2689         }
2690         len_to_track_end = 0;
2691         /*
2692          * A tidaw can address 4k of memory, but must not cross page boundaries
2693          * We can let the block layer handle this by setting
2694          * blk_queue_segment_boundary to page boundaries and
2695          * blk_max_segment_size to page size when setting up the request queue.
2696          * For write requests, a TIDAW must not cross track boundaries, because
2697          * we have to set the CBC flag on the last tidaw for each track.
2698          */
2699         if (rq_data_dir(req) == WRITE) {
2700                 new_track = 1;
2701                 recid = first_rec;
2702                 rq_for_each_segment(bv, req, iter) {
2703                         dst = page_address(bv->bv_page) + bv->bv_offset;
2704                         seg_len = bv->bv_len;
2705                         while (seg_len) {
2706                                 if (new_track) {
2707                                         trkid = recid;
2708                                         offs = sector_div(trkid, blk_per_trk);
2709                                         count_to_trk_end = blk_per_trk - offs;
2710                                         count = min((last_rec - recid + 1),
2711                                                     (sector_t)count_to_trk_end);
2712                                         len_to_track_end = count * blksize;
2713                                         recid += count;
2714                                         new_track = 0;
2715                                 }
2716                                 part_len = min(seg_len, len_to_track_end);
2717                                 seg_len -= part_len;
2718                                 len_to_track_end -= part_len;
2719                                 /* We need to end the tidaw at track end */
2720                                 if (!len_to_track_end) {
2721                                         new_track = 1;
2722                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
2723                                 } else
2724                                         tidaw_flags = 0;
2725                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
2726                                                             dst, part_len);
2727                                 if (IS_ERR(last_tidaw))
2728                                         return ERR_PTR(-EINVAL);
2729                                 dst += part_len;
2730                         }
2731                 }
2732         } else {
2733                 rq_for_each_segment(bv, req, iter) {
2734                         dst = page_address(bv->bv_page) + bv->bv_offset;
2735                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
2736                                                     dst, bv->bv_len);
2737                         if (IS_ERR(last_tidaw))
2738                                 return ERR_PTR(-EINVAL);
2739                 }
2740         }
2741         last_tidaw->flags |= TIDAW_FLAGS_LAST;
2742         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
2743         itcw_finalize(itcw);
2744
2745         if (blk_noretry_request(req) ||
2746             block->base->features & DASD_FEATURE_FAILFAST)
2747                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2748         cqr->cpmode = 1;
2749         cqr->startdev = startdev;
2750         cqr->memdev = startdev;
2751         cqr->block = block;
2752         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2753         cqr->lpm = startdev->path_data.ppm;
2754         cqr->retries = 256;
2755         cqr->buildclk = get_clock();
2756         cqr->status = DASD_CQR_FILLED;
2757         return cqr;
2758 }
2759
2760 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
2761                                                struct dasd_block *block,
2762                                                struct request *req)
2763 {
2764         int cmdrtd, cmdwtd;
2765         int use_prefix;
2766         int fcx_multitrack;
2767         struct dasd_eckd_private *private;
2768         struct dasd_device *basedev;
2769         sector_t first_rec, last_rec;
2770         sector_t first_trk, last_trk;
2771         unsigned int first_offs, last_offs;
2772         unsigned int blk_per_trk, blksize;
2773         int cdlspecial;
2774         unsigned int data_size;
2775         struct dasd_ccw_req *cqr;
2776
2777         basedev = block->base;
2778         private = (struct dasd_eckd_private *) basedev->private;
2779
2780         /* Calculate number of blocks/records per track. */
2781         blksize = block->bp_block;
2782         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2783         if (blk_per_trk == 0)
2784                 return ERR_PTR(-EINVAL);
2785         /* Calculate record id of first and last block. */
2786         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
2787         first_offs = sector_div(first_trk, blk_per_trk);
2788         last_rec = last_trk =
2789                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
2790         last_offs = sector_div(last_trk, blk_per_trk);
2791         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
2792
2793         fcx_multitrack = private->features.feature[40] & 0x20;
2794         data_size = blk_rq_bytes(req);
2795         /* tpm write request add CBC data on each track boundary */
2796         if (rq_data_dir(req) == WRITE)
2797                 data_size += (last_trk - first_trk) * 4;
2798
2799         /* is read track data and write track data in command mode supported? */
2800         cmdrtd = private->features.feature[9] & 0x20;
2801         cmdwtd = private->features.feature[12] & 0x40;
2802         use_prefix = private->features.feature[8] & 0x01;
2803
2804         cqr = NULL;
2805         if (cdlspecial || dasd_page_cache) {
2806                 /* do nothing, just fall through to the cmd mode single case */
2807         } else if ((data_size <= private->fcx_max_data)
2808                    && (fcx_multitrack || (first_trk == last_trk))) {
2809                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
2810                                                     first_rec, last_rec,
2811                                                     first_trk, last_trk,
2812                                                     first_offs, last_offs,
2813                                                     blk_per_trk, blksize);
2814                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
2815                     (PTR_ERR(cqr) != -ENOMEM))
2816                         cqr = NULL;
2817         } else if (use_prefix &&
2818                    (((rq_data_dir(req) == READ) && cmdrtd) ||
2819                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
2820                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
2821                                                    first_rec, last_rec,
2822                                                    first_trk, last_trk,
2823                                                    first_offs, last_offs,
2824                                                    blk_per_trk, blksize);
2825                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
2826                     (PTR_ERR(cqr) != -ENOMEM))
2827                         cqr = NULL;
2828         }
2829         if (!cqr)
2830                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
2831                                                     first_rec, last_rec,
2832                                                     first_trk, last_trk,
2833                                                     first_offs, last_offs,
2834                                                     blk_per_trk, blksize);
2835         return cqr;
2836 }
2837
2838 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
2839                                                struct dasd_block *block,
2840                                                struct request *req)
2841 {
2842         unsigned long *idaws;
2843         struct dasd_device *basedev;
2844         struct dasd_ccw_req *cqr;
2845         struct ccw1 *ccw;
2846         struct req_iterator iter;
2847         struct bio_vec *bv;
2848         char *dst;
2849         unsigned char cmd;
2850         unsigned int trkcount;
2851         unsigned int seg_len, len_to_track_end;
2852         unsigned int first_offs;
2853         unsigned int cidaw, cplength, datasize;
2854         sector_t first_trk, last_trk;
2855         unsigned int pfx_datasize;
2856
2857         /*
2858          * raw track access needs to be mutiple of 64k and on 64k boundary
2859          */
2860         if ((blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK) != 0) {
2861                 cqr = ERR_PTR(-EINVAL);
2862                 goto out;
2863         }
2864         if (((blk_rq_pos(req) + blk_rq_sectors(req)) %
2865              DASD_RAW_SECTORS_PER_TRACK) != 0) {
2866                 cqr = ERR_PTR(-EINVAL);
2867                 goto out;
2868         }
2869
2870         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
2871         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
2872                 DASD_RAW_SECTORS_PER_TRACK;
2873         trkcount = last_trk - first_trk + 1;
2874         first_offs = 0;
2875         basedev = block->base;
2876
2877         if (rq_data_dir(req) == READ)
2878                 cmd = DASD_ECKD_CCW_READ_TRACK;
2879         else if (rq_data_dir(req) == WRITE)
2880                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
2881         else {
2882                 cqr = ERR_PTR(-EINVAL);
2883                 goto out;
2884         }
2885
2886         /*
2887          * Raw track based I/O needs IDAWs for each page,
2888          * and not just for 64 bit addresses.
2889          */
2890         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
2891
2892         /* 1x prefix + one read/write ccw per track */
2893         cplength = 1 + trkcount;
2894
2895         /*
2896          * struct PFX_eckd_data has up to 2 byte as extended parameter
2897          * this is needed for write full track and has to be mentioned
2898          * separately
2899          * add 8 instead of 2 to keep 8 byte boundary
2900          */
2901         pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
2902
2903         datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
2904
2905         /* Allocate the ccw request. */
2906         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
2907                                    datasize, startdev);
2908         if (IS_ERR(cqr))
2909                 goto out;
2910         ccw = cqr->cpaddr;
2911
2912         if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
2913                        basedev, startdev, 1 /* format */, first_offs + 1,
2914                        trkcount, 0, 0) == -EAGAIN) {
2915                 /* Clock not in sync and XRC is enabled.
2916                  * Try again later.
2917                  */
2918                 dasd_sfree_request(cqr, startdev);
2919                 cqr = ERR_PTR(-EAGAIN);
2920                 goto out;
2921         }
2922
2923         idaws = (unsigned long *)(cqr->data + pfx_datasize);
2924
2925         len_to_track_end = 0;
2926
2927         rq_for_each_segment(bv, req, iter) {
2928                 dst = page_address(bv->bv_page) + bv->bv_offset;
2929                 seg_len = bv->bv_len;
2930                 if (!len_to_track_end) {
2931                         ccw[-1].flags |= CCW_FLAG_CC;
2932                         ccw->cmd_code = cmd;
2933                         /* maximum 3390 track size */
2934                         ccw->count = 57326;
2935                         /* 64k map to one track */
2936                         len_to_track_end = 65536;
2937                         ccw->cda = (__u32)(addr_t)idaws;
2938                         ccw->flags |= CCW_FLAG_IDA;
2939                         ccw->flags |= CCW_FLAG_SLI;
2940                         ccw++;
2941                 }
2942                 len_to_track_end -= seg_len;
2943                 idaws = idal_create_words(idaws, dst, seg_len);
2944         }
2945
2946         if (blk_noretry_request(req) ||
2947             block->base->features & DASD_FEATURE_FAILFAST)
2948                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2949         cqr->startdev = startdev;
2950         cqr->memdev = startdev;
2951         cqr->block = block;
2952         cqr->expires = startdev->default_expires * HZ;
2953         cqr->lpm = startdev->path_data.ppm;
2954         cqr->retries = 256;
2955         cqr->buildclk = get_clock();
2956         cqr->status = DASD_CQR_FILLED;
2957
2958         if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
2959                 cqr = NULL;
2960 out:
2961         return cqr;
2962 }
2963
2964
2965 static int
2966 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
2967 {
2968         struct dasd_eckd_private *private;
2969         struct ccw1 *ccw;
2970         struct req_iterator iter;
2971         struct bio_vec *bv;
2972         char *dst, *cda;
2973         unsigned int blksize, blk_per_trk, off;
2974         sector_t recid;
2975         int status;
2976
2977         if (!dasd_page_cache)
2978                 goto out;
2979         private = (struct dasd_eckd_private *) cqr->block->base->private;
2980         blksize = cqr->block->bp_block;
2981         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2982         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
2983         ccw = cqr->cpaddr;
2984         /* Skip over define extent & locate record. */
2985         ccw++;
2986         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
2987                 ccw++;
2988         rq_for_each_segment(bv, req, iter) {
2989                 dst = page_address(bv->bv_page) + bv->bv_offset;
2990                 for (off = 0; off < bv->bv_len; off += blksize) {
2991                         /* Skip locate record. */
2992                         if (private->uses_cdl && recid <= 2*blk_per_trk)
2993                                 ccw++;
2994                         if (dst) {
2995                                 if (ccw->flags & CCW_FLAG_IDA)
2996                                         cda = *((char **)((addr_t) ccw->cda));
2997                                 else
2998                                         cda = (char *)((addr_t) ccw->cda);
2999                                 if (dst != cda) {
3000                                         if (rq_data_dir(req) == READ)
3001                                                 memcpy(dst, cda, bv->bv_len);
3002                                         kmem_cache_free(dasd_page_cache,
3003                                             (void *)((addr_t)cda & PAGE_MASK));
3004                                 }
3005                                 dst = NULL;
3006                         }
3007                         ccw++;
3008                         recid++;
3009                 }
3010         }
3011 out:
3012         status = cqr->status == DASD_CQR_DONE;
3013         dasd_sfree_request(cqr, cqr->memdev);
3014         return status;
3015 }
3016
3017 /*
3018  * Modify ccw/tcw in cqr so it can be started on a base device.
3019  *
3020  * Note that this is not enough to restart the cqr!
3021  * Either reset cqr->startdev as well (summary unit check handling)
3022  * or restart via separate cqr (as in ERP handling).
3023  */
3024 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3025 {
3026         struct ccw1 *ccw;
3027         struct PFX_eckd_data *pfxdata;
3028         struct tcw *tcw;
3029         struct tccb *tccb;
3030         struct dcw *dcw;
3031
3032         if (cqr->cpmode == 1) {
3033                 tcw = cqr->cpaddr;
3034                 tccb = tcw_get_tccb(tcw);
3035                 dcw = (struct dcw *)&tccb->tca[0];
3036                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
3037                 pfxdata->validity.verify_base = 0;
3038                 pfxdata->validity.hyper_pav = 0;
3039         } else {
3040                 ccw = cqr->cpaddr;
3041                 pfxdata = cqr->data;
3042                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
3043                         pfxdata->validity.verify_base = 0;
3044                         pfxdata->validity.hyper_pav = 0;
3045                 }
3046         }
3047 }
3048
3049 #define DASD_ECKD_CHANQ_MAX_SIZE 4
3050
3051 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
3052                                                      struct dasd_block *block,
3053                                                      struct request *req)
3054 {
3055         struct dasd_eckd_private *private;
3056         struct dasd_device *startdev;
3057         unsigned long flags;
3058         struct dasd_ccw_req *cqr;
3059
3060         startdev = dasd_alias_get_start_dev(base);
3061         if (!startdev)
3062                 startdev = base;
3063         private = (struct dasd_eckd_private *) startdev->private;
3064         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
3065                 return ERR_PTR(-EBUSY);
3066
3067         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
3068         private->count++;
3069         if ((base->features & DASD_FEATURE_USERAW))
3070                 cqr = dasd_raw_build_cp(startdev, block, req);
3071         else
3072                 cqr = dasd_eckd_build_cp(startdev, block, req);
3073         if (IS_ERR(cqr))
3074                 private->count--;
3075         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
3076         return cqr;
3077 }
3078
3079 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
3080                                    struct request *req)
3081 {
3082         struct dasd_eckd_private *private;
3083         unsigned long flags;
3084
3085         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
3086         private = (struct dasd_eckd_private *) cqr->memdev->private;
3087         private->count--;
3088         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
3089         return dasd_eckd_free_cp(cqr, req);
3090 }
3091
3092 static int
3093 dasd_eckd_fill_info(struct dasd_device * device,
3094                     struct dasd_information2_t * info)
3095 {
3096         struct dasd_eckd_private *private;
3097
3098         private = (struct dasd_eckd_private *) device->private;
3099         info->label_block = 2;
3100         info->FBA_layout = private->uses_cdl ? 0 : 1;
3101         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
3102         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
3103         memcpy(info->characteristics, &private->rdc_data,
3104                sizeof(struct dasd_eckd_characteristics));
3105         info->confdata_size = min((unsigned long)private->conf_len,
3106                                   sizeof(info->configuration_data));
3107         memcpy(info->configuration_data, private->conf_data,
3108                info->confdata_size);
3109         return 0;
3110 }
3111
3112 /*
3113  * SECTION: ioctl functions for eckd devices.
3114  */
3115
3116 /*
3117  * Release device ioctl.
3118  * Buils a channel programm to releases a prior reserved
3119  * (see dasd_eckd_reserve) device.
3120  */
3121 static int
3122 dasd_eckd_release(struct dasd_device *device)
3123 {
3124         struct dasd_ccw_req *cqr;
3125         int rc;
3126         struct ccw1 *ccw;
3127         int useglobal;
3128
3129         if (!capable(CAP_SYS_ADMIN))
3130                 return -EACCES;
3131
3132         useglobal = 0;
3133         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3134         if (IS_ERR(cqr)) {
3135                 mutex_lock(&dasd_reserve_mutex);
3136                 useglobal = 1;
3137                 cqr = &dasd_reserve_req->cqr;
3138                 memset(cqr, 0, sizeof(*cqr));
3139                 memset(&dasd_reserve_req->ccw, 0,
3140                        sizeof(dasd_reserve_req->ccw));
3141                 cqr->cpaddr = &dasd_reserve_req->ccw;
3142                 cqr->data = &dasd_reserve_req->data;
3143                 cqr->magic = DASD_ECKD_MAGIC;
3144         }
3145         ccw = cqr->cpaddr;
3146         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
3147         ccw->flags |= CCW_FLAG_SLI;
3148         ccw->count = 32;
3149         ccw->cda = (__u32)(addr_t) cqr->data;
3150         cqr->startdev = device;
3151         cqr->memdev = device;
3152         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3153         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3154         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3155         cqr->expires = 2 * HZ;
3156         cqr->buildclk = get_clock();
3157         cqr->status = DASD_CQR_FILLED;
3158
3159         rc = dasd_sleep_on_immediatly(cqr);
3160         if (!rc)
3161                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3162
3163         if (useglobal)
3164                 mutex_unlock(&dasd_reserve_mutex);
3165         else
3166                 dasd_sfree_request(cqr, cqr->memdev);
3167         return rc;
3168 }
3169
3170 /*
3171  * Reserve device ioctl.
3172  * Options are set to 'synchronous wait for interrupt' and
3173  * 'timeout the request'. This leads to a terminate IO if
3174  * the interrupt is outstanding for a certain time.
3175  */
3176 static int
3177 dasd_eckd_reserve(struct dasd_device *device)
3178 {
3179         struct dasd_ccw_req *cqr;
3180         int rc;
3181         struct ccw1 *ccw;
3182         int useglobal;
3183
3184         if (!capable(CAP_SYS_ADMIN))
3185                 return -EACCES;
3186
3187         useglobal = 0;
3188         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3189         if (IS_ERR(cqr)) {
3190                 mutex_lock(&dasd_reserve_mutex);
3191                 useglobal = 1;
3192                 cqr = &dasd_reserve_req->cqr;
3193                 memset(cqr, 0, sizeof(*cqr));
3194                 memset(&dasd_reserve_req->ccw, 0,
3195                        sizeof(dasd_reserve_req->ccw));
3196                 cqr->cpaddr = &dasd_reserve_req->ccw;
3197                 cqr->data = &dasd_reserve_req->data;
3198                 cqr->magic = DASD_ECKD_MAGIC;
3199         }
3200         ccw = cqr->cpaddr;
3201         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
3202         ccw->flags |= CCW_FLAG_SLI;
3203         ccw->count = 32;
3204         ccw->cda = (__u32)(addr_t) cqr->data;
3205         cqr->startdev = device;
3206         cqr->memdev = device;
3207         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3208         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3209         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3210         cqr->expires = 2 * HZ;
3211         cqr->buildclk = get_clock();
3212         cqr->status = DASD_CQR_FILLED;
3213
3214         rc = dasd_sleep_on_immediatly(cqr);
3215         if (!rc)
3216                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3217
3218         if (useglobal)
3219                 mutex_unlock(&dasd_reserve_mutex);
3220         else
3221                 dasd_sfree_request(cqr, cqr->memdev);
3222         return rc;
3223 }
3224
3225 /*
3226  * Steal lock ioctl - unconditional reserve device.
3227  * Buils a channel programm to break a device's reservation.
3228  * (unconditional reserve)
3229  */
3230 static int
3231 dasd_eckd_steal_lock(struct dasd_device *device)
3232 {
3233         struct dasd_ccw_req *cqr;
3234         int rc;
3235         struct ccw1 *ccw;
3236         int useglobal;
3237
3238         if (!capable(CAP_SYS_ADMIN))
3239                 return -EACCES;
3240
3241         useglobal = 0;
3242         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3243         if (IS_ERR(cqr)) {
3244                 mutex_lock(&dasd_reserve_mutex);
3245                 useglobal = 1;
3246                 cqr = &dasd_reserve_req->cqr;
3247                 memset(cqr, 0, sizeof(*cqr));
3248                 memset(&dasd_reserve_req->ccw, 0,
3249                        sizeof(dasd_reserve_req->ccw));
3250                 cqr->cpaddr = &dasd_reserve_req->ccw;
3251                 cqr->data = &dasd_reserve_req->data;
3252                 cqr->magic = DASD_ECKD_MAGIC;
3253         }
3254         ccw = cqr->cpaddr;
3255         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
3256         ccw->flags |= CCW_FLAG_SLI;
3257         ccw->count = 32;
3258         ccw->cda = (__u32)(addr_t) cqr->data;
3259         cqr->startdev = device;
3260         cqr->memdev = device;
3261         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3262         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3263         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3264         cqr->expires = 2 * HZ;
3265         cqr->buildclk = get_clock();
3266         cqr->status = DASD_CQR_FILLED;
3267
3268         rc = dasd_sleep_on_immediatly(cqr);
3269         if (!rc)
3270                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3271
3272         if (useglobal)
3273                 mutex_unlock(&dasd_reserve_mutex);
3274         else
3275                 dasd_sfree_request(cqr, cqr->memdev);
3276         return rc;
3277 }
3278
3279 /*
3280  * SNID - Sense Path Group ID
3281  * This ioctl may be used in situations where I/O is stalled due to
3282  * a reserve, so if the normal dasd_smalloc_request fails, we use the
3283  * preallocated dasd_reserve_req.
3284  */
3285 static int dasd_eckd_snid(struct dasd_device *device,
3286                           void __user *argp)
3287 {
3288         struct dasd_ccw_req *cqr;
3289         int rc;
3290         struct ccw1 *ccw;
3291         int useglobal;
3292         struct dasd_snid_ioctl_data usrparm;
3293
3294         if (!capable(CAP_SYS_ADMIN))
3295                 return -EACCES;
3296
3297         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3298                 return -EFAULT;
3299
3300         useglobal = 0;
3301         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
3302                                    sizeof(struct dasd_snid_data), device);
3303         if (IS_ERR(cqr)) {
3304                 mutex_lock(&dasd_reserve_mutex);
3305                 useglobal = 1;
3306                 cqr = &dasd_reserve_req->cqr;
3307                 memset(cqr, 0, sizeof(*cqr));
3308                 memset(&dasd_reserve_req->ccw, 0,
3309                        sizeof(dasd_reserve_req->ccw));
3310                 cqr->cpaddr = &dasd_reserve_req->ccw;
3311                 cqr->data = &dasd_reserve_req->data;
3312                 cqr->magic = DASD_ECKD_MAGIC;
3313         }
3314         ccw = cqr->cpaddr;
3315         ccw->cmd_code = DASD_ECKD_CCW_SNID;
3316         ccw->flags |= CCW_FLAG_SLI;
3317         ccw->count = 12;
3318         ccw->cda = (__u32)(addr_t) cqr->data;
3319         cqr->startdev = device;
3320         cqr->memdev = device;
3321         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3322         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3323         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
3324         cqr->retries = 5;
3325         cqr->expires = 10 * HZ;
3326         cqr->buildclk = get_clock();
3327         cqr->status = DASD_CQR_FILLED;
3328         cqr->lpm = usrparm.path_mask;
3329
3330         rc = dasd_sleep_on_immediatly(cqr);
3331         /* verify that I/O processing didn't modify the path mask */
3332         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
3333                 rc = -EIO;
3334         if (!rc) {
3335                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
3336                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
3337                         rc = -EFAULT;
3338         }
3339
3340         if (useglobal)
3341                 mutex_unlock(&dasd_reserve_mutex);
3342         else
3343                 dasd_sfree_request(cqr, cqr->memdev);
3344         return rc;
3345 }
3346
3347 /*
3348  * Read performance statistics
3349  */
3350 static int
3351 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
3352 {
3353         struct dasd_psf_prssd_data *prssdp;
3354         struct dasd_rssd_perf_stats_t *stats;
3355         struct dasd_ccw_req *cqr;
3356         struct ccw1 *ccw;
3357         int rc;
3358
3359         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
3360                                    (sizeof(struct dasd_psf_prssd_data) +
3361                                     sizeof(struct dasd_rssd_perf_stats_t)),
3362                                    device);
3363         if (IS_ERR(cqr)) {
3364                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3365                             "Could not allocate initialization request");
3366                 return PTR_ERR(cqr);
3367         }
3368         cqr->startdev = device;
3369         cqr->memdev = device;
3370         cqr->retries = 0;
3371         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3372         cqr->expires = 10 * HZ;
3373
3374         /* Prepare for Read Subsystem Data */
3375         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3376         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
3377         prssdp->order = PSF_ORDER_PRSSD;
3378         prssdp->suborder = 0x01;        /* Performance Statistics */
3379         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
3380
3381         ccw = cqr->cpaddr;
3382         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3383         ccw->count = sizeof(struct dasd_psf_prssd_data);
3384         ccw->flags |= CCW_FLAG_CC;
3385         ccw->cda = (__u32)(addr_t) prssdp;
3386
3387         /* Read Subsystem Data - Performance Statistics */
3388         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3389         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
3390
3391         ccw++;
3392         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3393         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
3394         ccw->cda = (__u32)(addr_t) stats;
3395
3396         cqr->buildclk = get_clock();
3397         cqr->status = DASD_CQR_FILLED;
3398         rc = dasd_sleep_on(cqr);
3399         if (rc == 0) {
3400                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3401                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3402                 if (copy_to_user(argp, stats,
3403                                  sizeof(struct dasd_rssd_perf_stats_t)))
3404                         rc = -EFAULT;
3405         }
3406         dasd_sfree_request(cqr, cqr->memdev);
3407         return rc;
3408 }
3409
3410 /*
3411  * Get attributes (cache operations)
3412  * Returnes the cache attributes used in Define Extend (DE).
3413  */
3414 static int
3415 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
3416 {
3417         struct dasd_eckd_private *private =
3418                 (struct dasd_eckd_private *)device->private;
3419         struct attrib_data_t attrib = private->attrib;
3420         int rc;
3421
3422         if (!capable(CAP_SYS_ADMIN))
3423                 return -EACCES;
3424         if (!argp)
3425                 return -EINVAL;
3426
3427         rc = 0;
3428         if (copy_to_user(argp, (long *) &attrib,
3429                          sizeof(struct attrib_data_t)))
3430                 rc = -EFAULT;
3431
3432         return rc;
3433 }
3434
3435 /*
3436  * Set attributes (cache operations)
3437  * Stores the attributes for cache operation to be used in Define Extend (DE).
3438  */
3439 static int
3440 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
3441 {
3442         struct dasd_eckd_private *private =
3443                 (struct dasd_eckd_private *)device->private;
3444         struct attrib_data_t attrib;
3445
3446         if (!capable(CAP_SYS_ADMIN))
3447                 return -EACCES;
3448         if (!argp)
3449                 return -EINVAL;
3450
3451         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
3452                 return -EFAULT;
3453         private->attrib = attrib;
3454
3455         dev_info(&device->cdev->dev,
3456                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
3457                  private->attrib.operation, private->attrib.nr_cyl);
3458         return 0;
3459 }
3460
3461 /*
3462  * Issue syscall I/O to EMC Symmetrix array.
3463  * CCWs are PSF and RSSD
3464  */
3465 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
3466 {
3467         struct dasd_symmio_parms usrparm;
3468         char *psf_data, *rssd_result;
3469         struct dasd_ccw_req *cqr;
3470         struct ccw1 *ccw;
3471         char psf0, psf1;
3472         int rc;
3473
3474         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
3475                 return -EACCES;
3476         psf0 = psf1 = 0;
3477
3478         /* Copy parms from caller */
3479         rc = -EFAULT;
3480         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3481                 goto out;
3482         if (is_compat_task() || sizeof(long) == 4) {
3483                 /* Make sure pointers are sane even on 31 bit. */
3484                 rc = -EINVAL;
3485                 if ((usrparm.psf_data >> 32) != 0)
3486                         goto out;
3487                 if ((usrparm.rssd_result >> 32) != 0)
3488                         goto out;
3489                 usrparm.psf_data &= 0x7fffffffULL;
3490                 usrparm.rssd_result &= 0x7fffffffULL;
3491         }
3492         /* alloc I/O data area */
3493         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
3494         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
3495         if (!psf_data || !rssd_result) {
3496                 rc = -ENOMEM;
3497                 goto out_free;
3498         }
3499
3500         /* get syscall header from user space */
3501         rc = -EFAULT;
3502         if (copy_from_user(psf_data,
3503                            (void __user *)(unsigned long) usrparm.psf_data,
3504                            usrparm.psf_data_len))
3505                 goto out_free;
3506         psf0 = psf_data[0];
3507         psf1 = psf_data[1];
3508
3509         /* setup CCWs for PSF + RSSD */
3510         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
3511         if (IS_ERR(cqr)) {
3512                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3513                         "Could not allocate initialization request");
3514                 rc = PTR_ERR(cqr);
3515                 goto out_free;
3516         }
3517
3518         cqr->startdev = device;
3519         cqr->memdev = device;
3520         cqr->retries = 3;
3521         cqr->expires = 10 * HZ;
3522         cqr->buildclk = get_clock();
3523         cqr->status = DASD_CQR_FILLED;
3524
3525         /* Build the ccws */
3526         ccw = cqr->cpaddr;
3527
3528         /* PSF ccw */
3529         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3530         ccw->count = usrparm.psf_data_len;
3531         ccw->flags |= CCW_FLAG_CC;
3532         ccw->cda = (__u32)(addr_t) psf_data;
3533
3534         ccw++;
3535
3536         /* RSSD ccw  */
3537         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3538         ccw->count = usrparm.rssd_result_len;
3539         ccw->flags = CCW_FLAG_SLI ;
3540         ccw->cda = (__u32)(addr_t) rssd_result;
3541
3542         rc = dasd_sleep_on(cqr);
3543         if (rc)
3544                 goto out_sfree;
3545
3546         rc = -EFAULT;
3547         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
3548                            rssd_result, usrparm.rssd_result_len))
3549                 goto out_sfree;
3550         rc = 0;
3551
3552 out_sfree:
3553         dasd_sfree_request(cqr, cqr->memdev);
3554 out_free:
3555         kfree(rssd_result);
3556         kfree(psf_data);
3557 out:
3558         DBF_DEV_EVENT(DBF_WARNING, device,
3559                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
3560                       (int) psf0, (int) psf1, rc);
3561         return rc;
3562 }
3563
3564 static int
3565 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
3566 {
3567         struct dasd_device *device = block->base;
3568
3569         switch (cmd) {
3570         case BIODASDGATTR:
3571                 return dasd_eckd_get_attrib(device, argp);
3572         case BIODASDSATTR:
3573                 return dasd_eckd_set_attrib(device, argp);
3574         case BIODASDPSRD:
3575                 return dasd_eckd_performance(device, argp);
3576         case BIODASDRLSE:
3577                 return dasd_eckd_release(device);
3578         case BIODASDRSRV:
3579                 return dasd_eckd_reserve(device);
3580         case BIODASDSLCK:
3581                 return dasd_eckd_steal_lock(device);
3582         case BIODASDSNID:
3583                 return dasd_eckd_snid(device, argp);
3584         case BIODASDSYMMIO:
3585                 return dasd_symm_io(device, argp);
3586         default:
3587                 return -ENOIOCTLCMD;
3588         }
3589 }
3590
3591 /*
3592  * Dump the range of CCWs into 'page' buffer
3593  * and return number of printed chars.
3594  */
3595 static int
3596 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
3597 {
3598         int len, count;
3599         char *datap;
3600
3601         len = 0;
3602         while (from <= to) {
3603                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3604                                " CCW %p: %08X %08X DAT:",
3605                                from, ((int *) from)[0], ((int *) from)[1]);
3606
3607                 /* get pointer to data (consider IDALs) */
3608                 if (from->flags & CCW_FLAG_IDA)
3609                         datap = (char *) *((addr_t *) (addr_t) from->cda);
3610                 else
3611                         datap = (char *) ((addr_t) from->cda);
3612
3613                 /* dump data (max 32 bytes) */
3614                 for (count = 0; count < from->count && count < 32; count++) {
3615                         if (count % 8 == 0) len += sprintf(page + len, " ");
3616                         if (count % 4 == 0) len += sprintf(page + len, " ");
3617                         len += sprintf(page + len, "%02x", datap[count]);
3618                 }
3619                 len += sprintf(page + len, "\n");
3620                 from++;
3621         }
3622         return len;
3623 }
3624
3625 static void
3626 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
3627                          char *reason)
3628 {
3629         u64 *sense;
3630         u64 *stat;
3631
3632         sense = (u64 *) dasd_get_sense(irb);
3633         stat = (u64 *) &irb->scsw;
3634         if (sense) {
3635                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
3636                               "%016llx %016llx %016llx %016llx",
3637                               reason, *stat, *((u32 *) (stat + 1)),
3638                               sense[0], sense[1], sense[2], sense[3]);
3639         } else {
3640                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
3641                               reason, *stat, *((u32 *) (stat + 1)),
3642                               "NO VALID SENSE");
3643         }
3644 }
3645
3646 /*
3647  * Print sense data and related channel program.
3648  * Parts are printed because printk buffer is only 1024 bytes.
3649  */
3650 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
3651                                  struct dasd_ccw_req *req, struct irb *irb)
3652 {
3653         char *page;
3654         struct ccw1 *first, *last, *fail, *from, *to;
3655         int len, sl, sct;
3656
3657         page = (char *) get_zeroed_page(GFP_ATOMIC);
3658         if (page == NULL) {
3659                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3660                               "No memory to dump sense data\n");
3661                 return;
3662         }
3663         /* dump the sense data */
3664         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3665                       " I/O status report for device %s:\n",
3666                       dev_name(&device->cdev->dev));
3667         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3668                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
3669                        "CS:%02X RC:%d\n",
3670                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
3671                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
3672                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
3673                        req ? req->intrc : 0);
3674         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3675                        " device %s: Failing CCW: %p\n",
3676                        dev_name(&device->cdev->dev),
3677                        (void *) (addr_t) irb->scsw.cmd.cpa);
3678         if (irb->esw.esw0.erw.cons) {
3679                 for (sl = 0; sl < 4; sl++) {
3680                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3681                                        " Sense(hex) %2d-%2d:",
3682                                        (8 * sl), ((8 * sl) + 7));
3683
3684                         for (sct = 0; sct < 8; sct++) {
3685                                 len += sprintf(page + len, " %02x",
3686                                                irb->ecw[8 * sl + sct]);
3687                         }
3688                         len += sprintf(page + len, "\n");
3689                 }
3690
3691                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
3692                         /* 24 Byte Sense Data */
3693                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3694                                 " 24 Byte: %x MSG %x, "
3695                                 "%s MSGb to SYSOP\n",
3696                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
3697                                 irb->ecw[1] & 0x10 ? "" : "no");
3698                 } else {
3699                         /* 32 Byte Sense Data */
3700                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3701                                 " 32 Byte: Format: %x "
3702                                 "Exception class %x\n",
3703                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
3704                 }
3705         } else {
3706                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3707                         " SORRY - NO VALID SENSE AVAILABLE\n");
3708         }
3709         printk("%s", page);
3710
3711         if (req) {
3712                 /* req == NULL for unsolicited interrupts */
3713                 /* dump the Channel Program (max 140 Bytes per line) */
3714                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
3715                 first = req->cpaddr;
3716                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
3717                 to = min(first + 6, last);
3718                 len = sprintf(page,  KERN_ERR PRINTK_HEADER
3719                               " Related CP in req: %p\n", req);
3720                 dasd_eckd_dump_ccw_range(first, to, page + len);
3721                 printk("%s", page);
3722
3723                 /* print failing CCW area (maximum 4) */
3724                 /* scsw->cda is either valid or zero  */
3725                 len = 0;
3726                 from = ++to;
3727                 fail = (struct ccw1 *)(addr_t)
3728                                 irb->scsw.cmd.cpa; /* failing CCW */
3729                 if (from <  fail - 2) {
3730                         from = fail - 2;     /* there is a gap - print header */
3731                         len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
3732                 }
3733                 to = min(fail + 1, last);
3734                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
3735
3736                 /* print last CCWs (maximum 2) */
3737                 from = max(from, ++to);
3738                 if (from < last - 1) {
3739                         from = last - 1;     /* there is a gap - print header */
3740                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
3741                 }
3742                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
3743                 if (len > 0)
3744                         printk("%s", page);
3745         }
3746         free_page((unsigned long) page);
3747 }
3748
3749
3750 /*
3751  * Print sense data from a tcw.
3752  */
3753 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
3754                                  struct dasd_ccw_req *req, struct irb *irb)
3755 {
3756         char *page;
3757         int len, sl, sct, residual;
3758         struct tsb *tsb;
3759         u8 *sense, *rcq;
3760
3761         page = (char *) get_zeroed_page(GFP_ATOMIC);
3762         if (page == NULL) {
3763                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
3764                             "No memory to dump sense data");
3765                 return;
3766         }
3767         /* dump the sense data */
3768         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3769                       " I/O status report for device %s:\n",
3770                       dev_name(&device->cdev->dev));
3771         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3772                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
3773                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
3774                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
3775                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
3776                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
3777                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
3778                        req ? req->intrc : 0);
3779         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3780                        " device %s: Failing TCW: %p\n",
3781                        dev_name(&device->cdev->dev),
3782                        (void *) (addr_t) irb->scsw.tm.tcw);
3783
3784         tsb = NULL;
3785         sense = NULL;
3786         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
3787                 tsb = tcw_get_tsb(
3788                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
3789
3790         if (tsb) {
3791                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3792                                " tsb->length %d\n", tsb->length);
3793                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3794                                " tsb->flags %x\n", tsb->flags);
3795                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3796                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
3797                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3798                                " tsb->count %d\n", tsb->count);
3799                 residual = tsb->count - 28;
3800                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3801                                " residual %d\n", residual);
3802
3803                 switch (tsb->flags & 0x07) {
3804                 case 1: /* tsa_iostat */
3805                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3806                                " tsb->tsa.iostat.dev_time %d\n",
3807                                        tsb->tsa.iostat.dev_time);
3808                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3809                                " tsb->tsa.iostat.def_time %d\n",
3810                                        tsb->tsa.iostat.def_time);
3811                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3812                                " tsb->tsa.iostat.queue_time %d\n",
3813                                        tsb->tsa.iostat.queue_time);
3814                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3815                                " tsb->tsa.iostat.dev_busy_time %d\n",
3816                                        tsb->tsa.iostat.dev_busy_time);
3817                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3818                                " tsb->tsa.iostat.dev_act_time %d\n",
3819                                        tsb->tsa.iostat.dev_act_time);
3820                         sense = tsb->tsa.iostat.sense;
3821                         break;
3822                 case 2: /* ts_ddpc */
3823                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3824                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
3825                         for (sl = 0; sl < 2; sl++) {
3826                                 len += sprintf(page + len,
3827                                                KERN_ERR PRINTK_HEADER
3828                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
3829                                                (8 * sl), ((8 * sl) + 7));
3830                                 rcq = tsb->tsa.ddpc.rcq;
3831                                 for (sct = 0; sct < 8; sct++) {
3832                                         len += sprintf(page + len, " %02x",
3833                                                        rcq[8 * sl + sct]);
3834                                 }
3835                                 len += sprintf(page + len, "\n");
3836                         }
3837                         sense = tsb->tsa.ddpc.sense;
3838                         break;
3839                 case 3: /* tsa_intrg */
3840                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3841                                       " tsb->tsa.intrg.: not supportet yet \n");
3842                         break;
3843                 }
3844
3845                 if (sense) {
3846                         for (sl = 0; sl < 4; sl++) {
3847                                 len += sprintf(page + len,
3848                                                KERN_ERR PRINTK_HEADER
3849                                                " Sense(hex) %2d-%2d:",
3850                                                (8 * sl), ((8 * sl) + 7));
3851                                 for (sct = 0; sct < 8; sct++) {
3852                                         len += sprintf(page + len, " %02x",
3853                                                        sense[8 * sl + sct]);
3854                                 }
3855                                 len += sprintf(page + len, "\n");
3856                         }
3857
3858                         if (sense[27] & DASD_SENSE_BIT_0) {
3859                                 /* 24 Byte Sense Data */
3860                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3861                                         " 24 Byte: %x MSG %x, "
3862                                         "%s MSGb to SYSOP\n",
3863                                         sense[7] >> 4, sense[7] & 0x0f,
3864                                         sense[1] & 0x10 ? "" : "no");
3865                         } else {
3866                                 /* 32 Byte Sense Data */
3867                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3868                                         " 32 Byte: Format: %x "
3869                                         "Exception class %x\n",
3870                                         sense[6] & 0x0f, sense[22] >> 4);
3871                         }
3872                 } else {
3873                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3874                                 " SORRY - NO VALID SENSE AVAILABLE\n");
3875                 }
3876         } else {
3877                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3878                         " SORRY - NO TSB DATA AVAILABLE\n");
3879         }
3880         printk("%s", page);
3881         free_page((unsigned long) page);
3882 }
3883
3884 static void dasd_eckd_dump_sense(struct dasd_device *device,
3885                                  struct dasd_ccw_req *req, struct irb *irb)
3886 {
3887         if (scsw_is_tm(&irb->scsw))
3888                 dasd_eckd_dump_sense_tcw(device, req, irb);
3889         else
3890                 dasd_eckd_dump_sense_ccw(device, req, irb);
3891 }
3892
3893 static int dasd_eckd_pm_freeze(struct dasd_device *device)
3894 {
3895         /*
3896          * the device should be disconnected from our LCU structure
3897          * on restore we will reconnect it and reread LCU specific
3898          * information like PAV support that might have changed
3899          */
3900         dasd_alias_remove_device(device);
3901         dasd_alias_disconnect_device_from_lcu(device);
3902
3903         return 0;
3904 }
3905
3906 static int dasd_eckd_restore_device(struct dasd_device *device)
3907 {
3908         struct dasd_eckd_private *private;
3909         struct dasd_eckd_characteristics temp_rdc_data;
3910         int is_known, rc;
3911         struct dasd_uid temp_uid;
3912         unsigned long flags;
3913
3914         private = (struct dasd_eckd_private *) device->private;
3915
3916         /* Read Configuration Data */
3917         rc = dasd_eckd_read_conf(device);
3918         if (rc)
3919                 goto out_err;
3920
3921         dasd_eckd_get_uid(device, &temp_uid);
3922         /* Generate device unique id */
3923         rc = dasd_eckd_generate_uid(device);
3924         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
3925         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
3926                 dev_err(&device->cdev->dev, "The UID of the DASD has "
3927                         "changed\n");
3928         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
3929         if (rc)
3930                 goto out_err;
3931
3932         /* register lcu with alias handling, enable PAV if this is a new lcu */
3933         is_known = dasd_alias_make_device_known_to_lcu(device);
3934         if (is_known < 0)
3935                 return is_known;
3936         if (!is_known) {
3937                 dasd_eckd_validate_server(device);
3938                 dasd_alias_lcu_setup_complete(device);
3939         } else
3940                 dasd_alias_wait_for_lcu_setup(device);
3941
3942         /* RE-Read Configuration Data */
3943         rc = dasd_eckd_read_conf(device);
3944         if (rc)
3945                 goto out_err;
3946
3947         /* Read Feature Codes */
3948         dasd_eckd_read_features(device);
3949
3950         /* Read Device Characteristics */
3951         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
3952                                          &temp_rdc_data, 64);
3953         if (rc) {
3954                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
3955                                 "Read device characteristic failed, rc=%d", rc);
3956                 goto out_err;
3957         }
3958         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
3959         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
3960         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
3961
3962         /* add device to alias management */
3963         dasd_alias_add_device(device);
3964
3965         return 0;
3966
3967 out_err:
3968         return -1;
3969 }
3970
3971 static int dasd_eckd_reload_device(struct dasd_device *device)
3972 {
3973         struct dasd_eckd_private *private;
3974         int rc, old_base;
3975         char print_uid[60];
3976         struct dasd_uid uid;
3977         unsigned long flags;
3978
3979         private = (struct dasd_eckd_private *) device->private;
3980
3981         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
3982         old_base = private->uid.base_unit_addr;
3983         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
3984
3985         /* Read Configuration Data */
3986         rc = dasd_eckd_read_conf(device);
3987         if (rc)
3988                 goto out_err;
3989
3990         rc = dasd_eckd_generate_uid(device);
3991         if (rc)
3992                 goto out_err;
3993         /*
3994          * update unit address configuration and
3995          * add device to alias management
3996          */
3997         dasd_alias_update_add_device(device);
3998
3999         dasd_eckd_get_uid(device, &uid);
4000
4001         if (old_base != uid.base_unit_addr) {
4002                 if (strlen(uid.vduit) > 0)
4003                         snprintf(print_uid, sizeof(print_uid),
4004                                  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
4005                                  uid.ssid, uid.base_unit_addr, uid.vduit);
4006                 else
4007                         snprintf(print_uid, sizeof(print_uid),
4008                                  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
4009                                  uid.ssid, uid.base_unit_addr);
4010
4011                 dev_info(&device->cdev->dev,
4012                          "An Alias device was reassigned to a new base device "
4013                          "with UID: %s\n", print_uid);
4014         }
4015         return 0;
4016
4017 out_err:
4018         return -1;
4019 }
4020
4021 static struct ccw_driver dasd_eckd_driver = {
4022         .driver = {
4023                 .name   = "dasd-eckd",
4024                 .owner  = THIS_MODULE,
4025         },
4026         .ids         = dasd_eckd_ids,
4027         .probe       = dasd_eckd_probe,
4028         .remove      = dasd_generic_remove,
4029         .set_offline = dasd_generic_set_offline,
4030         .set_online  = dasd_eckd_set_online,
4031         .notify      = dasd_generic_notify,
4032         .path_event  = dasd_generic_path_event,
4033         .freeze      = dasd_generic_pm_freeze,
4034         .thaw        = dasd_generic_restore_device,
4035         .restore     = dasd_generic_restore_device,
4036         .uc_handler  = dasd_generic_uc_handler,
4037         .int_class   = IOINT_DAS,
4038 };
4039
4040 /*
4041  * max_blocks is dependent on the amount of storage that is available
4042  * in the static io buffer for each device. Currently each device has
4043  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
4044  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
4045  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
4046  * addition we have one define extent ccw + 16 bytes of data and one
4047  * locate record ccw + 16 bytes of data. That makes:
4048  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
4049  * We want to fit two into the available memory so that we can immediately
4050  * start the next request if one finishes off. That makes 249.5 blocks
4051  * for one request. Give a little safety and the result is 240.
4052  */
4053 static struct dasd_discipline dasd_eckd_discipline = {
4054         .owner = THIS_MODULE,
4055         .name = "ECKD",
4056         .ebcname = "ECKD",
4057         .max_blocks = 190,
4058         .check_device = dasd_eckd_check_characteristics,
4059         .uncheck_device = dasd_eckd_uncheck_device,
4060         .do_analysis = dasd_eckd_do_analysis,
4061         .verify_path = dasd_eckd_verify_path,
4062         .ready_to_online = dasd_eckd_ready_to_online,
4063         .online_to_ready = dasd_eckd_online_to_ready,
4064         .fill_geometry = dasd_eckd_fill_geometry,
4065         .start_IO = dasd_start_IO,
4066         .term_IO = dasd_term_IO,
4067         .handle_terminated_request = dasd_eckd_handle_terminated_request,
4068         .format_device = dasd_eckd_format_device,
4069         .erp_action = dasd_eckd_erp_action,
4070         .erp_postaction = dasd_eckd_erp_postaction,
4071         .check_for_device_change = dasd_eckd_check_for_device_change,
4072         .build_cp = dasd_eckd_build_alias_cp,
4073         .free_cp = dasd_eckd_free_alias_cp,
4074         .dump_sense = dasd_eckd_dump_sense,
4075         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
4076         .fill_info = dasd_eckd_fill_info,
4077         .ioctl = dasd_eckd_ioctl,
4078         .freeze = dasd_eckd_pm_freeze,
4079         .restore = dasd_eckd_restore_device,
4080         .reload = dasd_eckd_reload_device,
4081         .get_uid = dasd_eckd_get_uid,
4082 };
4083
4084 static int __init
4085 dasd_eckd_init(void)
4086 {
4087         int ret;
4088
4089         ASCEBC(dasd_eckd_discipline.ebcname, 4);
4090         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
4091                                    GFP_KERNEL | GFP_DMA);
4092         if (!dasd_reserve_req)
4093                 return -ENOMEM;
4094         path_verification_worker = kmalloc(sizeof(*path_verification_worker),
4095                                    GFP_KERNEL | GFP_DMA);
4096         if (!path_verification_worker) {
4097                 kfree(dasd_reserve_req);
4098                 return -ENOMEM;
4099         }
4100         ret = ccw_driver_register(&dasd_eckd_driver);
4101         if (!ret)
4102                 wait_for_device_probe();
4103         else {
4104                 kfree(path_verification_worker);
4105                 kfree(dasd_reserve_req);
4106         }
4107         return ret;
4108 }
4109
4110 static void __exit
4111 dasd_eckd_cleanup(void)
4112 {
4113         ccw_driver_unregister(&dasd_eckd_driver);
4114         kfree(path_verification_worker);
4115         kfree(dasd_reserve_req);
4116 }
4117
4118 module_init(dasd_eckd_init);
4119 module_exit(dasd_eckd_cleanup);