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