drivers/s390/block/dasd_eckd.c

   1 /*
   2  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   3  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   4  *                  Carsten Otte <Cotte@de.ibm.com>
   5  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   6  * Bugreports.to..: <Linux390@de.ibm.com>
   7  * Copyright IBM Corp. 1999, 2009
   8  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
   9  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
  10  */
  11
  12 #define KMSG_COMPONENT "dasd-eckd"
  13
  14 #include <linux/stddef.h>
  15 #include <linux/kernel.h>
  16 #include <linux/slab.h>
  17 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  18 #include <linux/bio.h>
  19 #include <linux/module.h>
  20 #include <linux/compat.h>
  21 #include <linux/init.h>
  22
  23 #include <asm/css_chars.h>
  24 #include <asm/debug.h>
  25 #include <asm/idals.h>
  26 #include <asm/ebcdic.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
  36 #ifdef PRINTK_HEADER
  37 #undef PRINTK_HEADER
  38 #endif                          /* PRINTK_HEADER */
  39 #define PRINTK_HEADER "dasd(eckd):"
  40
  41 #define ECKD_C0(i) (i->home_bytes)
  42 #define ECKD_F(i) (i->formula)
  43 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
  44                     (i->factors.f_0x02.f1))
  45 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
  46                     (i->factors.f_0x02.f2))
  47 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
  48                     (i->factors.f_0x02.f3))
  49 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
  50 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
  51 #define ECKD_F6(i) (i->factor6)
  52 #define ECKD_F7(i) (i->factor7)
  53 #define ECKD_F8(i) (i->factor8)
  54
  55 /*
  56  * raw track access always map to 64k in memory
  57  * so it maps to 16 blocks of 4k per track
  58  */
  59 #define DASD_RAW_BLOCK_PER_TRACK 16
  60 #define DASD_RAW_BLOCKSIZE 4096
  61 /* 64k are 128 x 512 byte sectors  */
  62 #define DASD_RAW_SECTORS_PER_TRACK 128
  63
  64 MODULE_LICENSE("GPL");
  65
  66 static struct dasd_discipline dasd_eckd_discipline;
  67
  68 /* The ccw bus type uses this table to find devices that it sends to
  69  * dasd_eckd_probe */
  70 static struct ccw_device_id dasd_eckd_ids[] = {
  71         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
  72         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
  73         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
  74         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
  75         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
  76         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
  77         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
  78         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
  79         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
  80         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
  81         { /* end of list */ },
  82 };
  83
  84 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  85
  86 static struct ccw_driver dasd_eckd_driver; /* see below */
  87
  88 #define INIT_CQR_OK 0
  89 #define INIT_CQR_UNFORMATTED 1
  90 #define INIT_CQR_ERROR 2
  91
  92 /* emergency request for reserve/release */
  93 static struct {
  94         struct dasd_ccw_req cqr;
  95         struct ccw1 ccw;
  96         char data[32];
  97 } *dasd_reserve_req;
  98 static DEFINE_MUTEX(dasd_reserve_mutex);
  99
 100 /* definitions for the path verification worker */
 101 struct path_verification_work_data {
 102         struct work_struct worker;
 103         struct dasd_device *device;
 104         struct dasd_ccw_req cqr;
 105         struct ccw1 ccw;
 106         __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
 107         int isglobal;
 108         __u8 tbvpm;
 109 };
 110 static struct path_verification_work_data *path_verification_worker;
 111 static DEFINE_MUTEX(dasd_path_verification_mutex);
 112
 113 /* initial attempt at a probe function. this can be simplified once
 114  * the other detection code is gone */
 115 static int
 116 dasd_eckd_probe (struct ccw_device *cdev)
 117 {
 118         int ret;
 119
 120         /* set ECKD specific ccw-device options */
 121         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
 122                                      CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
 123         if (ret) {
 124                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
 125                                 "dasd_eckd_probe: could not set "
 126                                 "ccw-device options");
 127                 return ret;
 128         }
 129         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
 130         return ret;
 131 }
 132
 133 static int
 134 dasd_eckd_set_online(struct ccw_device *cdev)
 135 {
 136         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
 137 }
 138
 139 static const int sizes_trk0[] = { 28, 148, 84 };
 140 #define LABEL_SIZE 140
 141
 142 /* head and record addresses of count_area read in analysis ccw */
 143 static const int count_area_head[] = { 0, 0, 0, 0, 2 };
 144 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
 145
 146 static inline unsigned int
 147 round_up_multiple(unsigned int no, unsigned int mult)
 148 {
 149         int rem = no % mult;
 150         return (rem ? no - rem + mult : no);
 151 }
 152
 153 static inline unsigned int
 154 ceil_quot(unsigned int d1, unsigned int d2)
 155 {
 156         return (d1 + (d2 - 1)) / d2;
 157 }
 158
 159 static unsigned int
 160 recs_per_track(struct dasd_eckd_characteristics * rdc,
 161                unsigned int kl, unsigned int dl)
 162 {
 163         int dn, kn;
 164
 165         switch (rdc->dev_type) {
 166         case 0x3380:
 167                 if (kl)
 168                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 169                                        ceil_quot(dl + 12, 32));
 170                 else
 171                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 172         case 0x3390:
 173                 dn = ceil_quot(dl + 6, 232) + 1;
 174                 if (kl) {
 175                         kn = ceil_quot(kl + 6, 232) + 1;
 176                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 177                                        9 + ceil_quot(dl + 6 * dn, 34));
 178                 } else
 179                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 180         case 0x9345:
 181                 dn = ceil_quot(dl + 6, 232) + 1;
 182                 if (kl) {
 183                         kn = ceil_quot(kl + 6, 232) + 1;
 184                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 185                                        ceil_quot(dl + 6 * dn, 34));
 186                 } else
 187                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 188         }
 189         return 0;
 190 }
 191
 192 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
 193 {
 194         geo->cyl = (__u16) cyl;
 195         geo->head = cyl >> 16;
 196         geo->head <<= 4;
 197         geo->head |= head;
 198 }
 199
 200 static int
 201 check_XRC (struct ccw1         *de_ccw,
 202            struct DE_eckd_data *data,
 203            struct dasd_device  *device)
 204 {
 205         struct dasd_eckd_private *private;
 206         int rc;
 207
 208         private = (struct dasd_eckd_private *) device->private;
 209         if (!private->rdc_data.facilities.XRC_supported)
 210                 return 0;
 211
 212         /* switch on System Time Stamp - needed for XRC Support */
 213         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 214         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 215
 216         rc = get_sync_clock(&data->ep_sys_time);
 217         /* Ignore return code if sync clock is switched off. */
 218         if (rc == -EOPNOTSUPP || rc == -EACCES)
 219                 rc = 0;
 220
 221         de_ccw->count = sizeof(struct DE_eckd_data);
 222         de_ccw->flags |= CCW_FLAG_SLI;
 223         return rc;
 224 }
 225
 226 static int
 227 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
 228               unsigned int totrk, int cmd, struct dasd_device *device)
 229 {
 230         struct dasd_eckd_private *private;
 231         u32 begcyl, endcyl;
 232         u16 heads, beghead, endhead;
 233         int rc = 0;
 234
 235         private = (struct dasd_eckd_private *) device->private;
 236
 237         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 238         ccw->flags = 0;
 239         ccw->count = 16;
 240         ccw->cda = (__u32) __pa(data);
 241
 242         memset(data, 0, sizeof(struct DE_eckd_data));
 243         switch (cmd) {
 244         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 245         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 246         case DASD_ECKD_CCW_READ:
 247         case DASD_ECKD_CCW_READ_MT:
 248         case DASD_ECKD_CCW_READ_CKD:
 249         case DASD_ECKD_CCW_READ_CKD_MT:
 250         case DASD_ECKD_CCW_READ_KD:
 251         case DASD_ECKD_CCW_READ_KD_MT:
 252         case DASD_ECKD_CCW_READ_COUNT:
 253                 data->mask.perm = 0x1;
 254                 data->attributes.operation = private->attrib.operation;
 255                 break;
 256         case DASD_ECKD_CCW_WRITE:
 257         case DASD_ECKD_CCW_WRITE_MT:
 258         case DASD_ECKD_CCW_WRITE_KD:
 259         case DASD_ECKD_CCW_WRITE_KD_MT:
 260                 data->mask.perm = 0x02;
 261                 data->attributes.operation = private->attrib.operation;
 262                 rc = check_XRC (ccw, data, device);
 263                 break;
 264         case DASD_ECKD_CCW_WRITE_CKD:
 265         case DASD_ECKD_CCW_WRITE_CKD_MT:
 266                 data->attributes.operation = DASD_BYPASS_CACHE;
 267                 rc = check_XRC (ccw, data, device);
 268                 break;
 269         case DASD_ECKD_CCW_ERASE:
 270         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 271         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 272                 data->mask.perm = 0x3;
 273                 data->mask.auth = 0x1;
 274                 data->attributes.operation = DASD_BYPASS_CACHE;
 275                 rc = check_XRC (ccw, data, device);
 276                 break;
 277         default:
 278                 dev_err(&device->cdev->dev,
 279                         "0x%x is not a known command\n", cmd);
 280                 break;
 281         }
 282
 283         data->attributes.mode = 0x3;    /* ECKD */
 284
 285         if ((private->rdc_data.cu_type == 0x2105 ||
 286              private->rdc_data.cu_type == 0x2107 ||
 287              private->rdc_data.cu_type == 0x1750)
 288             && !(private->uses_cdl && trk < 2))
 289                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 290
 291         heads = private->rdc_data.trk_per_cyl;
 292         begcyl = trk / heads;
 293         beghead = trk % heads;
 294         endcyl = totrk / heads;
 295         endhead = totrk % heads;
 296
 297         /* check for sequential prestage - enhance cylinder range */
 298         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 299             data->attributes.operation == DASD_SEQ_ACCESS) {
 300
 301                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
 302                         endcyl += private->attrib.nr_cyl;
 303                 else
 304                         endcyl = (private->real_cyl - 1);
 305         }
 306
 307         set_ch_t(&data->beg_ext, begcyl, beghead);
 308         set_ch_t(&data->end_ext, endcyl, endhead);
 309         return rc;
 310 }
 311
 312 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
 313                                struct dasd_device  *device)
 314 {
 315         struct dasd_eckd_private *private;
 316         int rc;
 317
 318         private = (struct dasd_eckd_private *) device->private;
 319         if (!private->rdc_data.facilities.XRC_supported)
 320                 return 0;
 321
 322         /* switch on System Time Stamp - needed for XRC Support */
 323         pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid'   */
 324         pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
 325         pfxdata->validity.time_stamp = 1;           /* 'Time Stamp Valid'   */
 326
 327         rc = get_sync_clock(&pfxdata->define_extent.ep_sys_time);
 328         /* Ignore return code if sync clock is switched off. */
 329         if (rc == -EOPNOTSUPP || rc == -EACCES)
 330                 rc = 0;
 331         return rc;
 332 }
 333
 334 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
 335                           unsigned int rec_on_trk, int count, int cmd,
 336                           struct dasd_device *device, unsigned int reclen,
 337                           unsigned int tlf)
 338 {
 339         struct dasd_eckd_private *private;
 340         int sector;
 341         int dn, d;
 342
 343         private = (struct dasd_eckd_private *) device->private;
 344
 345         memset(data, 0, sizeof(*data));
 346         sector = 0;
 347         if (rec_on_trk) {
 348                 switch (private->rdc_data.dev_type) {
 349                 case 0x3390:
 350                         dn = ceil_quot(reclen + 6, 232);
 351                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 352                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 353                         break;
 354                 case 0x3380:
 355                         d = 7 + ceil_quot(reclen + 12, 32);
 356                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 357                         break;
 358                 }
 359         }
 360         data->sector = sector;
 361         /* note: meaning of count depends on the operation
 362          *       for record based I/O it's the number of records, but for
 363          *       track based I/O it's the number of tracks
 364          */
 365         data->count = count;
 366         switch (cmd) {
 367         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 368                 data->operation.orientation = 0x3;
 369                 data->operation.operation = 0x03;
 370                 break;
 371         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 372                 data->operation.orientation = 0x3;
 373                 data->operation.operation = 0x16;
 374                 break;
 375         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 376                 data->operation.orientation = 0x1;
 377                 data->operation.operation = 0x03;
 378                 data->count++;
 379                 break;
 380         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 381                 data->operation.orientation = 0x3;
 382                 data->operation.operation = 0x16;
 383                 data->count++;
 384                 break;
 385         case DASD_ECKD_CCW_WRITE:
 386         case DASD_ECKD_CCW_WRITE_MT:
 387         case DASD_ECKD_CCW_WRITE_KD:
 388         case DASD_ECKD_CCW_WRITE_KD_MT:
 389                 data->auxiliary.length_valid = 0x1;
 390                 data->length = reclen;
 391                 data->operation.operation = 0x01;
 392                 break;
 393         case DASD_ECKD_CCW_WRITE_CKD:
 394         case DASD_ECKD_CCW_WRITE_CKD_MT:
 395                 data->auxiliary.length_valid = 0x1;
 396                 data->length = reclen;
 397                 data->operation.operation = 0x03;
 398                 break;
 399         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 400                 data->operation.orientation = 0x0;
 401                 data->operation.operation = 0x3F;
 402                 data->extended_operation = 0x11;
 403                 data->length = 0;
 404                 data->extended_parameter_length = 0x02;
 405                 if (data->count > 8) {
 406                         data->extended_parameter[0] = 0xFF;
 407                         data->extended_parameter[1] = 0xFF;
 408                         data->extended_parameter[1] <<= (16 - count);
 409                 } else {
 410                         data->extended_parameter[0] = 0xFF;
 411                         data->extended_parameter[0] <<= (8 - count);
 412                         data->extended_parameter[1] = 0x00;
 413                 }
 414                 data->sector = 0xFF;
 415                 break;
 416         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 417                 data->auxiliary.length_valid = 0x1;
 418                 data->length = reclen;  /* not tlf, as one might think */
 419                 data->operation.operation = 0x3F;
 420                 data->extended_operation = 0x23;
 421                 break;
 422         case DASD_ECKD_CCW_READ:
 423         case DASD_ECKD_CCW_READ_MT:
 424         case DASD_ECKD_CCW_READ_KD:
 425         case DASD_ECKD_CCW_READ_KD_MT:
 426                 data->auxiliary.length_valid = 0x1;
 427                 data->length = reclen;
 428                 data->operation.operation = 0x06;
 429                 break;
 430         case DASD_ECKD_CCW_READ_CKD:
 431         case DASD_ECKD_CCW_READ_CKD_MT:
 432                 data->auxiliary.length_valid = 0x1;
 433                 data->length = reclen;
 434                 data->operation.operation = 0x16;
 435                 break;
 436         case DASD_ECKD_CCW_READ_COUNT:
 437                 data->operation.operation = 0x06;
 438                 break;
 439         case DASD_ECKD_CCW_READ_TRACK:
 440                 data->operation.orientation = 0x1;
 441                 data->operation.operation = 0x0C;
 442                 data->extended_parameter_length = 0;
 443                 data->sector = 0xFF;
 444                 break;
 445         case DASD_ECKD_CCW_READ_TRACK_DATA:
 446                 data->auxiliary.length_valid = 0x1;
 447                 data->length = tlf;
 448                 data->operation.operation = 0x0C;
 449                 break;
 450         case DASD_ECKD_CCW_ERASE:
 451                 data->length = reclen;
 452                 data->auxiliary.length_valid = 0x1;
 453                 data->operation.operation = 0x0b;
 454                 break;
 455         default:
 456                 DBF_DEV_EVENT(DBF_ERR, device,
 457                             "fill LRE unknown opcode 0x%x", cmd);
 458                 BUG();
 459         }
 460         set_ch_t(&data->seek_addr,
 461                  trk / private->rdc_data.trk_per_cyl,
 462                  trk % private->rdc_data.trk_per_cyl);
 463         data->search_arg.cyl = data->seek_addr.cyl;
 464         data->search_arg.head = data->seek_addr.head;
 465         data->search_arg.record = rec_on_trk;
 466 }
 467
 468 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 469                       unsigned int trk, unsigned int totrk, int cmd,
 470                       struct dasd_device *basedev, struct dasd_device *startdev,
 471                       unsigned char format, unsigned int rec_on_trk, int count,
 472                       unsigned int blksize, unsigned int tlf)
 473 {
 474         struct dasd_eckd_private *basepriv, *startpriv;
 475         struct DE_eckd_data *dedata;
 476         struct LRE_eckd_data *lredata;
 477         u32 begcyl, endcyl;
 478         u16 heads, beghead, endhead;
 479         int rc = 0;
 480
 481         basepriv = (struct dasd_eckd_private *) basedev->private;
 482         startpriv = (struct dasd_eckd_private *) startdev->private;
 483         dedata = &pfxdata->define_extent;
 484         lredata = &pfxdata->locate_record;
 485
 486         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 487         ccw->flags = 0;
 488         if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
 489                 ccw->count = sizeof(*pfxdata) + 2;
 490                 ccw->cda = (__u32) __pa(pfxdata);
 491                 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
 492         } else {
 493                 ccw->count = sizeof(*pfxdata);
 494                 ccw->cda = (__u32) __pa(pfxdata);
 495                 memset(pfxdata, 0, sizeof(*pfxdata));
 496         }
 497
 498         /* prefix data */
 499         if (format > 1) {
 500                 DBF_DEV_EVENT(DBF_ERR, basedev,
 501                               "PFX LRE unknown format 0x%x", format);
 502                 BUG();
 503                 return -EINVAL;
 504         }
 505         pfxdata->format = format;
 506         pfxdata->base_address = basepriv->ned->unit_addr;
 507         pfxdata->base_lss = basepriv->ned->ID;
 508         pfxdata->validity.define_extent = 1;
 509
 510         /* private uid is kept up to date, conf_data may be outdated */
 511         if (startpriv->uid.type != UA_BASE_DEVICE) {
 512                 pfxdata->validity.verify_base = 1;
 513                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
 514                         pfxdata->validity.hyper_pav = 1;
 515         }
 516
 517         /* define extend data (mostly)*/
 518         switch (cmd) {
 519         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 520         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 521         case DASD_ECKD_CCW_READ:
 522         case DASD_ECKD_CCW_READ_MT:
 523         case DASD_ECKD_CCW_READ_CKD:
 524         case DASD_ECKD_CCW_READ_CKD_MT:
 525         case DASD_ECKD_CCW_READ_KD:
 526         case DASD_ECKD_CCW_READ_KD_MT:
 527         case DASD_ECKD_CCW_READ_COUNT:
 528                 dedata->mask.perm = 0x1;
 529                 dedata->attributes.operation = basepriv->attrib.operation;
 530                 break;
 531         case DASD_ECKD_CCW_READ_TRACK:
 532         case DASD_ECKD_CCW_READ_TRACK_DATA:
 533                 dedata->mask.perm = 0x1;
 534                 dedata->attributes.operation = basepriv->attrib.operation;
 535                 dedata->blk_size = 0;
 536                 break;
 537         case DASD_ECKD_CCW_WRITE:
 538         case DASD_ECKD_CCW_WRITE_MT:
 539         case DASD_ECKD_CCW_WRITE_KD:
 540         case DASD_ECKD_CCW_WRITE_KD_MT:
 541                 dedata->mask.perm = 0x02;
 542                 dedata->attributes.operation = basepriv->attrib.operation;
 543                 rc = check_XRC_on_prefix(pfxdata, basedev);
 544                 break;
 545         case DASD_ECKD_CCW_WRITE_CKD:
 546         case DASD_ECKD_CCW_WRITE_CKD_MT:
 547                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 548                 rc = check_XRC_on_prefix(pfxdata, basedev);
 549                 break;
 550         case DASD_ECKD_CCW_ERASE:
 551         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 552         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 553                 dedata->mask.perm = 0x3;
 554                 dedata->mask.auth = 0x1;
 555                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 556                 rc = check_XRC_on_prefix(pfxdata, basedev);
 557                 break;
 558         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 559                 dedata->mask.perm = 0x03;
 560                 dedata->attributes.operation = basepriv->attrib.operation;
 561                 dedata->blk_size = 0;
 562                 break;
 563         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 564                 dedata->mask.perm = 0x02;
 565                 dedata->attributes.operation = basepriv->attrib.operation;
 566                 dedata->blk_size = blksize;
 567                 rc = check_XRC_on_prefix(pfxdata, basedev);
 568                 break;
 569         default:
 570                 DBF_DEV_EVENT(DBF_ERR, basedev,
 571                             "PFX LRE unknown opcode 0x%x", cmd);
 572                 BUG();
 573                 return -EINVAL;
 574         }
 575
 576         dedata->attributes.mode = 0x3;  /* ECKD */
 577
 578         if ((basepriv->rdc_data.cu_type == 0x2105 ||
 579              basepriv->rdc_data.cu_type == 0x2107 ||
 580              basepriv->rdc_data.cu_type == 0x1750)
 581             && !(basepriv->uses_cdl && trk < 2))
 582                 dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
 583
 584         heads = basepriv->rdc_data.trk_per_cyl;
 585         begcyl = trk / heads;
 586         beghead = trk % heads;
 587         endcyl = totrk / heads;
 588         endhead = totrk % heads;
 589
 590         /* check for sequential prestage - enhance cylinder range */
 591         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
 592             dedata->attributes.operation == DASD_SEQ_ACCESS) {
 593
 594                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
 595                         endcyl += basepriv->attrib.nr_cyl;
 596                 else
 597                         endcyl = (basepriv->real_cyl - 1);
 598         }
 599
 600         set_ch_t(&dedata->beg_ext, begcyl, beghead);
 601         set_ch_t(&dedata->end_ext, endcyl, endhead);
 602
 603         if (format == 1) {
 604                 fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
 605                               basedev, blksize, tlf);
 606         }
 607
 608         return rc;
 609 }
 610
 611 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 612                   unsigned int trk, unsigned int totrk, int cmd,
 613                   struct dasd_device *basedev, struct dasd_device *startdev)
 614 {
 615         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
 616                           0, 0, 0, 0, 0);
 617 }
 618
 619 static void
 620 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
 621               unsigned int rec_on_trk, int no_rec, int cmd,
 622               struct dasd_device * device, int reclen)
 623 {
 624         struct dasd_eckd_private *private;
 625         int sector;
 626         int dn, d;
 627
 628         private = (struct dasd_eckd_private *) device->private;
 629
 630         DBF_DEV_EVENT(DBF_INFO, device,
 631                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 632                   trk, rec_on_trk, no_rec, cmd, reclen);
 633
 634         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 635         ccw->flags = 0;
 636         ccw->count = 16;
 637         ccw->cda = (__u32) __pa(data);
 638
 639         memset(data, 0, sizeof(struct LO_eckd_data));
 640         sector = 0;
 641         if (rec_on_trk) {
 642                 switch (private->rdc_data.dev_type) {
 643                 case 0x3390:
 644                         dn = ceil_quot(reclen + 6, 232);
 645                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 646                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 647                         break;
 648                 case 0x3380:
 649                         d = 7 + ceil_quot(reclen + 12, 32);
 650                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 651                         break;
 652                 }
 653         }
 654         data->sector = sector;
 655         data->count = no_rec;
 656         switch (cmd) {
 657         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 658                 data->operation.orientation = 0x3;
 659                 data->operation.operation = 0x03;
 660                 break;
 661         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 662                 data->operation.orientation = 0x3;
 663                 data->operation.operation = 0x16;
 664                 break;
 665         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 666                 data->operation.orientation = 0x1;
 667                 data->operation.operation = 0x03;
 668                 data->count++;
 669                 break;
 670         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 671                 data->operation.orientation = 0x3;
 672                 data->operation.operation = 0x16;
 673                 data->count++;
 674                 break;
 675         case DASD_ECKD_CCW_WRITE:
 676         case DASD_ECKD_CCW_WRITE_MT:
 677         case DASD_ECKD_CCW_WRITE_KD:
 678         case DASD_ECKD_CCW_WRITE_KD_MT:
 679                 data->auxiliary.last_bytes_used = 0x1;
 680                 data->length = reclen;
 681                 data->operation.operation = 0x01;
 682                 break;
 683         case DASD_ECKD_CCW_WRITE_CKD:
 684         case DASD_ECKD_CCW_WRITE_CKD_MT:
 685                 data->auxiliary.last_bytes_used = 0x1;
 686                 data->length = reclen;
 687                 data->operation.operation = 0x03;
 688                 break;
 689         case DASD_ECKD_CCW_READ:
 690         case DASD_ECKD_CCW_READ_MT:
 691         case DASD_ECKD_CCW_READ_KD:
 692         case DASD_ECKD_CCW_READ_KD_MT:
 693                 data->auxiliary.last_bytes_used = 0x1;
 694                 data->length = reclen;
 695                 data->operation.operation = 0x06;
 696                 break;
 697         case DASD_ECKD_CCW_READ_CKD:
 698         case DASD_ECKD_CCW_READ_CKD_MT:
 699                 data->auxiliary.last_bytes_used = 0x1;
 700                 data->length = reclen;
 701                 data->operation.operation = 0x16;
 702                 break;
 703         case DASD_ECKD_CCW_READ_COUNT:
 704                 data->operation.operation = 0x06;
 705                 break;
 706         case DASD_ECKD_CCW_ERASE:
 707                 data->length = reclen;
 708                 data->auxiliary.last_bytes_used = 0x1;
 709                 data->operation.operation = 0x0b;
 710                 break;
 711         default:
 712                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
 713                               "opcode 0x%x", cmd);
 714         }
 715         set_ch_t(&data->seek_addr,
 716                  trk / private->rdc_data.trk_per_cyl,
 717                  trk % private->rdc_data.trk_per_cyl);
 718         data->search_arg.cyl = data->seek_addr.cyl;
 719         data->search_arg.head = data->seek_addr.head;
 720         data->search_arg.record = rec_on_trk;
 721 }
 722
 723 /*
 724  * Returns 1 if the block is one of the special blocks that needs
 725  * to get read/written with the KD variant of the command.
 726  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 727  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 728  * Luckily the KD variants differ only by one bit (0x08) from the
 729  * normal variant. So don't wonder about code like:
 730  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 731  *         ccw->cmd_code |= 0x8;
 732  */
 733 static inline int
 734 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 735 {
 736         if (recid < 3)
 737                 return 1;
 738         if (recid < blk_per_trk)
 739                 return 0;
 740         if (recid < 2 * blk_per_trk)
 741                 return 1;
 742         return 0;
 743 }
 744
 745 /*
 746  * Returns the record size for the special blocks of the cdl format.
 747  * Only returns something useful if dasd_eckd_cdl_special is true
 748  * for the recid.
 749  */
 750 static inline int
 751 dasd_eckd_cdl_reclen(int recid)
 752 {
 753         if (recid < 3)
 754                 return sizes_trk0[recid];
 755         return LABEL_SIZE;
 756 }
 757 /* create unique id from private structure. */
 758 static void create_uid(struct dasd_eckd_private *private)
 759 {
 760         int count;
 761         struct dasd_uid *uid;
 762
 763         uid = &private->uid;
 764         memset(uid, 0, sizeof(struct dasd_uid));
 765         memcpy(uid->vendor, private->ned->HDA_manufacturer,
 766                sizeof(uid->vendor) - 1);
 767         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 768         memcpy(uid->serial, private->ned->HDA_location,
 769                sizeof(uid->serial) - 1);
 770         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 771         uid->ssid = private->gneq->subsystemID;
 772         uid->real_unit_addr = private->ned->unit_addr;
 773         if (private->sneq) {
 774                 uid->type = private->sneq->sua_flags;
 775                 if (uid->type == UA_BASE_PAV_ALIAS)
 776                         uid->base_unit_addr = private->sneq->base_unit_addr;
 777         } else {
 778                 uid->type = UA_BASE_DEVICE;
 779         }
 780         if (private->vdsneq) {
 781                 for (count = 0; count < 16; count++) {
 782                         sprintf(uid->vduit+2*count, "%02x",
 783                                 private->vdsneq->uit[count]);
 784                 }
 785         }
 786 }
 787
 788 /*
 789  * Generate device unique id that specifies the physical device.
 790  */
 791 static int dasd_eckd_generate_uid(struct dasd_device *device)
 792 {
 793         struct dasd_eckd_private *private;
 794         unsigned long flags;
 795
 796         private = (struct dasd_eckd_private *) device->private;
 797         if (!private)
 798                 return -ENODEV;
 799         if (!private->ned || !private->gneq)
 800                 return -ENODEV;
 801         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 802         create_uid(private);
 803         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 804         return 0;
 805 }
 806
 807 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
 808 {
 809         struct dasd_eckd_private *private;
 810         unsigned long flags;
 811
 812         if (device->private) {
 813                 private = (struct dasd_eckd_private *)device->private;
 814                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 815                 *uid = private->uid;
 816                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 817                 return 0;
 818         }
 819         return -EINVAL;
 820 }
 821
 822 /*
 823  * compare device UID with data of a given dasd_eckd_private structure
 824  * return 0 for match
 825  */
 826 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
 827                                       struct dasd_eckd_private *private)
 828 {
 829         struct dasd_uid device_uid;
 830
 831         create_uid(private);
 832         dasd_eckd_get_uid(device, &device_uid);
 833
 834         return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
 835 }
 836
 837 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
 838                                    struct dasd_ccw_req *cqr,
 839                                    __u8 *rcd_buffer,
 840                                    __u8 lpm)
 841 {
 842         struct ccw1 *ccw;
 843         /*
 844          * buffer has to start with EBCDIC "V1.0" to show
 845          * support for virtual device SNEQ
 846          */
 847         rcd_buffer[0] = 0xE5;
 848         rcd_buffer[1] = 0xF1;
 849         rcd_buffer[2] = 0x4B;
 850         rcd_buffer[3] = 0xF0;
 851
 852         ccw = cqr->cpaddr;
 853         ccw->cmd_code = DASD_ECKD_CCW_RCD;
 854         ccw->flags = 0;
 855         ccw->cda = (__u32)(addr_t)rcd_buffer;
 856         ccw->count = DASD_ECKD_RCD_DATA_SIZE;
 857         cqr->magic = DASD_ECKD_MAGIC;
 858
 859         cqr->startdev = device;
 860         cqr->memdev = device;
 861         cqr->block = NULL;
 862         cqr->expires = 10*HZ;
 863         cqr->lpm = lpm;
 864         cqr->retries = 256;
 865         cqr->buildclk = get_clock();
 866         cqr->status = DASD_CQR_FILLED;
 867         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
 868 }
 869
 870 /*
 871  * Wakeup helper for read_conf
 872  * if the cqr is not done and needs some error recovery
 873  * the buffer has to be re-initialized with the EBCDIC "V1.0"
 874  * to show support for virtual device SNEQ
 875  */
 876 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
 877 {
 878         struct ccw1 *ccw;
 879         __u8 *rcd_buffer;
 880
 881         if (cqr->status !=  DASD_CQR_DONE) {
 882                 ccw = cqr->cpaddr;
 883                 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
 884                 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
 885
 886                 rcd_buffer[0] = 0xE5;
 887                 rcd_buffer[1] = 0xF1;
 888                 rcd_buffer[2] = 0x4B;
 889                 rcd_buffer[3] = 0xF0;
 890         }
 891         dasd_wakeup_cb(cqr, data);
 892 }
 893
 894 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
 895                                            struct dasd_ccw_req *cqr,
 896                                            __u8 *rcd_buffer,
 897                                            __u8 lpm)
 898 {
 899         struct ciw *ciw;
 900         int rc;
 901         /*
 902          * sanity check: scan for RCD command in extended SenseID data
 903          * some devices do not support RCD
 904          */
 905         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 906         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
 907                 return -EOPNOTSUPP;
 908
 909         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
 910         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 911         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
 912         cqr->retries = 5;
 913         cqr->callback = read_conf_cb;
 914         rc = dasd_sleep_on_immediatly(cqr);
 915         return rc;
 916 }
 917
 918 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 919                                    void **rcd_buffer,
 920                                    int *rcd_buffer_size, __u8 lpm)
 921 {
 922         struct ciw *ciw;
 923         char *rcd_buf = NULL;
 924         int ret;
 925         struct dasd_ccw_req *cqr;
 926
 927         /*
 928          * sanity check: scan for RCD command in extended SenseID data
 929          * some devices do not support RCD
 930          */
 931         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 932         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
 933                 ret = -EOPNOTSUPP;
 934                 goto out_error;
 935         }
 936         rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
 937         if (!rcd_buf) {
 938                 ret = -ENOMEM;
 939                 goto out_error;
 940         }
 941         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
 942                                    0, /* use rcd_buf as data ara */
 943                                    device);
 944         if (IS_ERR(cqr)) {
 945                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 946                               "Could not allocate RCD request");
 947                 ret = -ENOMEM;
 948                 goto out_error;
 949         }
 950         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
 951         cqr->callback = read_conf_cb;
 952         ret = dasd_sleep_on(cqr);
 953         /*
 954          * on success we update the user input parms
 955          */
 956         dasd_sfree_request(cqr, cqr->memdev);
 957         if (ret)
 958                 goto out_error;
 959
 960         *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
 961         *rcd_buffer = rcd_buf;
 962         return 0;
 963 out_error:
 964         kfree(rcd_buf);
 965         *rcd_buffer = NULL;
 966         *rcd_buffer_size = 0;
 967         return ret;
 968 }
 969
 970 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
 971 {
 972
 973         struct dasd_sneq *sneq;
 974         int i, count;
 975
 976         private->ned = NULL;
 977         private->sneq = NULL;
 978         private->vdsneq = NULL;
 979         private->gneq = NULL;
 980         count = private->conf_len / sizeof(struct dasd_sneq);
 981         sneq = (struct dasd_sneq *)private->conf_data;
 982         for (i = 0; i < count; ++i) {
 983                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 984                         private->sneq = sneq;
 985                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 986                         private->vdsneq = (struct vd_sneq *)sneq;
 987                 else if (sneq->flags.identifier == 2)
 988                         private->gneq = (struct dasd_gneq *)sneq;
 989                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 990                         private->ned = (struct dasd_ned *)sneq;
 991                 sneq++;
 992         }
 993         if (!private->ned || !private->gneq) {
 994                 private->ned = NULL;
 995                 private->sneq = NULL;
 996                 private->vdsneq = NULL;
 997                 private->gneq = NULL;
 998                 return -EINVAL;
 999         }
1000         return 0;
1001
1002 };
1003
1004 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
1005 {
1006         struct dasd_gneq *gneq;
1007         int i, count, found;
1008
1009         count = conf_len / sizeof(*gneq);
1010         gneq = (struct dasd_gneq *)conf_data;
1011         found = 0;
1012         for (i = 0; i < count; ++i) {
1013                 if (gneq->flags.identifier == 2) {
1014                         found = 1;
1015                         break;
1016                 }
1017                 gneq++;
1018         }
1019         if (found)
1020                 return ((char *)gneq)[18] & 0x07;
1021         else
1022                 return 0;
1023 }
1024
1025 static int dasd_eckd_read_conf(struct dasd_device *device)
1026 {
1027         void *conf_data;
1028         int conf_len, conf_data_saved;
1029         int rc, path_err;
1030         __u8 lpm, opm;
1031         struct dasd_eckd_private *private, path_private;
1032         struct dasd_path *path_data;
1033         struct dasd_uid *uid;
1034         char print_path_uid[60], print_device_uid[60];
1035
1036         private = (struct dasd_eckd_private *) device->private;
1037         path_data = &device->path_data;
1038         opm = ccw_device_get_path_mask(device->cdev);
1039         conf_data_saved = 0;
1040         path_err = 0;
1041         /* get configuration data per operational path */
1042         for (lpm = 0x80; lpm; lpm>>= 1) {
1043                 if (!(lpm & opm))
1044                         continue;
1045                 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1046                                              &conf_len, lpm);
1047                 if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
1048                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1049                                         "Read configuration data returned "
1050                                         "error %d", rc);
1051                         return rc;
1052                 }
1053                 if (conf_data == NULL) {
1054                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1055                                         "No configuration data "
1056                                         "retrieved");
1057                         /* no further analysis possible */
1058                         path_data->opm |= lpm;
1059                         continue;       /* no error */
1060                 }
1061                 /* save first valid configuration data */
1062                 if (!conf_data_saved) {
1063                         kfree(private->conf_data);
1064                         private->conf_data = conf_data;
1065                         private->conf_len = conf_len;
1066                         if (dasd_eckd_identify_conf_parts(private)) {
1067                                 private->conf_data = NULL;
1068                                 private->conf_len = 0;
1069                                 kfree(conf_data);
1070                                 continue;
1071                         }
1072                         /*
1073                          * build device UID that other path data
1074                          * can be compared to it
1075                          */
1076                         dasd_eckd_generate_uid(device);
1077                         conf_data_saved++;
1078                 } else {
1079                         path_private.conf_data = conf_data;
1080                         path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1081                         if (dasd_eckd_identify_conf_parts(
1082                                     &path_private)) {
1083                                 path_private.conf_data = NULL;
1084                                 path_private.conf_len = 0;
1085                                 kfree(conf_data);
1086                                 continue;
1087                         }
1088
1089                         if (dasd_eckd_compare_path_uid(
1090                                     device, &path_private)) {
1091                                 uid = &path_private.uid;
1092                                 if (strlen(uid->vduit) > 0)
1093                                         snprintf(print_path_uid,
1094                                                  sizeof(print_path_uid),
1095                                                  "%s.%s.%04x.%02x.%s",
1096                                                  uid->vendor, uid->serial,
1097                                                  uid->ssid, uid->real_unit_addr,
1098                                                  uid->vduit);
1099                                 else
1100                                         snprintf(print_path_uid,
1101                                                  sizeof(print_path_uid),
1102                                                  "%s.%s.%04x.%02x",
1103                                                  uid->vendor, uid->serial,
1104                                                  uid->ssid,
1105                                                  uid->real_unit_addr);
1106                                 uid = &private->uid;
1107                                 if (strlen(uid->vduit) > 0)
1108                                         snprintf(print_device_uid,
1109                                                  sizeof(print_device_uid),
1110                                                  "%s.%s.%04x.%02x.%s",
1111                                                  uid->vendor, uid->serial,
1112                                                  uid->ssid, uid->real_unit_addr,
1113                                                  uid->vduit);
1114                                 else
1115                                         snprintf(print_device_uid,
1116                                                  sizeof(print_device_uid),
1117                                                  "%s.%s.%04x.%02x",
1118                                                  uid->vendor, uid->serial,
1119                                                  uid->ssid,
1120                                                  uid->real_unit_addr);
1121                                 dev_err(&device->cdev->dev,
1122                                         "Not all channel paths lead to "
1123                                         "the same device, path %02X leads to "
1124                                         "device %s instead of %s\n", lpm,
1125                                         print_path_uid, print_device_uid);
1126                                 path_err = -EINVAL;
1127                                 continue;
1128                         }
1129
1130                         path_private.conf_data = NULL;
1131                         path_private.conf_len = 0;
1132                 }
1133                 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1134                 case 0x02:
1135                         path_data->npm |= lpm;
1136                         break;
1137                 case 0x03:
1138                         path_data->ppm |= lpm;
1139                         break;
1140                 }
1141                 path_data->opm |= lpm;
1142
1143                 if (conf_data != private->conf_data)
1144                         kfree(conf_data);
1145         }
1146
1147         return path_err;
1148 }
1149
1150 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1151 {
1152         struct dasd_eckd_private *private;
1153         int mdc;
1154         u32 fcx_max_data;
1155
1156         private = (struct dasd_eckd_private *) device->private;
1157         if (private->fcx_max_data) {
1158                 mdc = ccw_device_get_mdc(device->cdev, lpm);
1159                 if ((mdc < 0)) {
1160                         dev_warn(&device->cdev->dev,
1161                                  "Detecting the maximum data size for zHPF "
1162                                  "requests failed (rc=%d) for a new path %x\n",
1163                                  mdc, lpm);
1164                         return mdc;
1165                 }
1166                 fcx_max_data = mdc * FCX_MAX_DATA_FACTOR;
1167                 if (fcx_max_data < private->fcx_max_data) {
1168                         dev_warn(&device->cdev->dev,
1169                                  "The maximum data size for zHPF requests %u "
1170                                  "on a new path %x is below the active maximum "
1171                                  "%u\n", fcx_max_data, lpm,
1172                                  private->fcx_max_data);
1173                         return -EACCES;
1174                 }
1175         }
1176         return 0;
1177 }
1178
1179 static int rebuild_device_uid(struct dasd_device *device,
1180                               struct path_verification_work_data *data)
1181 {
1182         struct dasd_eckd_private *private;
1183         struct dasd_path *path_data;
1184         __u8 lpm, opm;
1185         int rc;
1186
1187         rc = -ENODEV;
1188         private = (struct dasd_eckd_private *) device->private;
1189         path_data = &device->path_data;
1190         opm = device->path_data.opm;
1191
1192         for (lpm = 0x80; lpm; lpm >>= 1) {
1193                 if (!(lpm & opm))
1194                         continue;
1195                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1196                 memset(&data->cqr, 0, sizeof(data->cqr));
1197                 data->cqr.cpaddr = &data->ccw;
1198                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1199                                                      data->rcd_buffer,
1200                                                      lpm);
1201
1202                 if (rc) {
1203                         if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1204                                 continue;
1205                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1206                                         "Read configuration data "
1207                                         "returned error %d", rc);
1208                         break;
1209                 }
1210                 memcpy(private->conf_data, data->rcd_buffer,
1211                        DASD_ECKD_RCD_DATA_SIZE);
1212                 if (dasd_eckd_identify_conf_parts(private)) {
1213                         rc = -ENODEV;
1214                 } else /* first valid path is enough */
1215                         break;
1216         }
1217
1218         if (!rc)
1219                 rc = dasd_eckd_generate_uid(device);
1220
1221         return rc;
1222 }
1223
1224 static void do_path_verification_work(struct work_struct *work)
1225 {
1226         struct path_verification_work_data *data;
1227         struct dasd_device *device;
1228         struct dasd_eckd_private path_private;
1229         struct dasd_uid *uid;
1230         __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1231         __u8 lpm, opm, npm, ppm, epm;
1232         unsigned long flags;
1233         char print_uid[60];
1234         int rc;
1235
1236         data = container_of(work, struct path_verification_work_data, worker);
1237         device = data->device;
1238
1239         /* delay path verification until device was resumed */
1240         if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1241                 schedule_work(work);
1242                 return;
1243         }
1244
1245         opm = 0;
1246         npm = 0;
1247         ppm = 0;
1248         epm = 0;
1249         for (lpm = 0x80; lpm; lpm >>= 1) {
1250                 if (!(lpm & data->tbvpm))
1251                         continue;
1252                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1253                 memset(&data->cqr, 0, sizeof(data->cqr));
1254                 data->cqr.cpaddr = &data->ccw;
1255                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1256                                                      data->rcd_buffer,
1257                                                      lpm);
1258                 if (!rc) {
1259                         switch (dasd_eckd_path_access(data->rcd_buffer,
1260                                                       DASD_ECKD_RCD_DATA_SIZE)
1261                                 ) {
1262                         case 0x02:
1263                                 npm |= lpm;
1264                                 break;
1265                         case 0x03:
1266                                 ppm |= lpm;
1267                                 break;
1268                         }
1269                         opm |= lpm;
1270                 } else if (rc == -EOPNOTSUPP) {
1271                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1272                                         "path verification: No configuration "
1273                                         "data retrieved");
1274                         opm |= lpm;
1275                 } else if (rc == -EAGAIN) {
1276                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1277                                         "path verification: device is stopped,"
1278                                         " try again later");
1279                         epm |= lpm;
1280                 } else {
1281                         dev_warn(&device->cdev->dev,
1282                                  "Reading device feature codes failed "
1283                                  "(rc=%d) for new path %x\n", rc, lpm);
1284                         continue;
1285                 }
1286                 if (verify_fcx_max_data(device, lpm)) {
1287                         opm &= ~lpm;
1288                         npm &= ~lpm;
1289                         ppm &= ~lpm;
1290                         continue;
1291                 }
1292
1293                 /*
1294                  * save conf_data for comparison after
1295                  * rebuild_device_uid may have changed
1296                  * the original data
1297                  */
1298                 memcpy(&path_rcd_buf, data->rcd_buffer,
1299                        DASD_ECKD_RCD_DATA_SIZE);
1300                 path_private.conf_data = (void *) &path_rcd_buf;
1301                 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1302                 if (dasd_eckd_identify_conf_parts(&path_private)) {
1303                         path_private.conf_data = NULL;
1304                         path_private.conf_len = 0;
1305                         continue;
1306                 }
1307
1308                 /*
1309                  * compare path UID with device UID only if at least
1310                  * one valid path is left
1311                  * in other case the device UID may have changed and
1312                  * the first working path UID will be used as device UID
1313                  */
1314                 if (device->path_data.opm &&
1315                     dasd_eckd_compare_path_uid(device, &path_private)) {
1316                         /*
1317                          * the comparison was not successful
1318                          * rebuild the device UID with at least one
1319                          * known path in case a z/VM hyperswap command
1320                          * has changed the device
1321                          *
1322                          * after this compare again
1323                          *
1324                          * if either the rebuild or the recompare fails
1325                          * the path can not be used
1326                          */
1327                         if (rebuild_device_uid(device, data) ||
1328                             dasd_eckd_compare_path_uid(
1329                                     device, &path_private)) {
1330                                 uid = &path_private.uid;
1331                                 if (strlen(uid->vduit) > 0)
1332                                         snprintf(print_uid, sizeof(print_uid),
1333                                                  "%s.%s.%04x.%02x.%s",
1334                                                  uid->vendor, uid->serial,
1335                                                  uid->ssid, uid->real_unit_addr,
1336                                                  uid->vduit);
1337                                 else
1338                                         snprintf(print_uid, sizeof(print_uid),
1339                                                  "%s.%s.%04x.%02x",
1340                                                  uid->vendor, uid->serial,
1341                                                  uid->ssid,
1342                                                  uid->real_unit_addr);
1343                                 dev_err(&device->cdev->dev,
1344                                         "The newly added channel path %02X "
1345                                         "will not be used because it leads "
1346                                         "to a different device %s\n",
1347                                         lpm, print_uid);
1348                                 opm &= ~lpm;
1349                                 npm &= ~lpm;
1350                                 ppm &= ~lpm;
1351                                 continue;
1352                         }
1353                 }
1354
1355                 /*
1356                  * There is a small chance that a path is lost again between
1357                  * above path verification and the following modification of
1358                  * the device opm mask. We could avoid that race here by using
1359                  * yet another path mask, but we rather deal with this unlikely
1360                  * situation in dasd_start_IO.
1361                  */
1362                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1363                 if (!device->path_data.opm && opm) {
1364                         device->path_data.opm = opm;
1365                         dasd_generic_path_operational(device);
1366                 } else
1367                         device->path_data.opm |= opm;
1368                 device->path_data.npm |= npm;
1369                 device->path_data.ppm |= ppm;
1370                 device->path_data.tbvpm |= epm;
1371                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1372         }
1373
1374         dasd_put_device(device);
1375         if (data->isglobal)
1376                 mutex_unlock(&dasd_path_verification_mutex);
1377         else
1378                 kfree(data);
1379 }
1380
1381 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1382 {
1383         struct path_verification_work_data *data;
1384
1385         data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1386         if (!data) {
1387                 if (mutex_trylock(&dasd_path_verification_mutex)) {
1388                         data = path_verification_worker;
1389                         data->isglobal = 1;
1390                 } else
1391                         return -ENOMEM;
1392         } else {
1393                 memset(data, 0, sizeof(*data));
1394                 data->isglobal = 0;
1395         }
1396         INIT_WORK(&data->worker, do_path_verification_work);
1397         dasd_get_device(device);
1398         data->device = device;
1399         data->tbvpm = lpm;
1400         schedule_work(&data->worker);
1401         return 0;
1402 }
1403
1404 static int dasd_eckd_read_features(struct dasd_device *device)
1405 {
1406         struct dasd_psf_prssd_data *prssdp;
1407         struct dasd_rssd_features *features;
1408         struct dasd_ccw_req *cqr;
1409         struct ccw1 *ccw;
1410         int rc;
1411         struct dasd_eckd_private *private;
1412
1413         private = (struct dasd_eckd_private *) device->private;
1414         memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1415         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1416                                    (sizeof(struct dasd_psf_prssd_data) +
1417                                     sizeof(struct dasd_rssd_features)),
1418                                    device);
1419         if (IS_ERR(cqr)) {
1420                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1421                                 "allocate initialization request");
1422                 return PTR_ERR(cqr);
1423         }
1424         cqr->startdev = device;
1425         cqr->memdev = device;
1426         cqr->block = NULL;
1427         cqr->retries = 256;
1428         cqr->expires = 10 * HZ;
1429
1430         /* Prepare for Read Subsystem Data */
1431         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1432         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1433         prssdp->order = PSF_ORDER_PRSSD;
1434         prssdp->suborder = 0x41;        /* Read Feature Codes */
1435         /* all other bytes of prssdp must be zero */
1436
1437         ccw = cqr->cpaddr;
1438         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1439         ccw->count = sizeof(struct dasd_psf_prssd_data);
1440         ccw->flags |= CCW_FLAG_CC;
1441         ccw->cda = (__u32)(addr_t) prssdp;
1442
1443         /* Read Subsystem Data - feature codes */
1444         features = (struct dasd_rssd_features *) (prssdp + 1);
1445         memset(features, 0, sizeof(struct dasd_rssd_features));
1446
1447         ccw++;
1448         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1449         ccw->count = sizeof(struct dasd_rssd_features);
1450         ccw->cda = (__u32)(addr_t) features;
1451
1452         cqr->buildclk = get_clock();
1453         cqr->status = DASD_CQR_FILLED;
1454         rc = dasd_sleep_on(cqr);
1455         if (rc == 0) {
1456                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1457                 features = (struct dasd_rssd_features *) (prssdp + 1);
1458                 memcpy(&private->features, features,
1459                        sizeof(struct dasd_rssd_features));
1460         } else
1461                 dev_warn(&device->cdev->dev, "Reading device feature codes"
1462                          " failed with rc=%d\n", rc);
1463         dasd_sfree_request(cqr, cqr->memdev);
1464         return rc;
1465 }
1466
1467
1468 /*
1469  * Build CP for Perform Subsystem Function - SSC.
1470  */
1471 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1472                                                     int enable_pav)
1473 {
1474         struct dasd_ccw_req *cqr;
1475         struct dasd_psf_ssc_data *psf_ssc_data;
1476         struct ccw1 *ccw;
1477
1478         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1479                                   sizeof(struct dasd_psf_ssc_data),
1480                                   device);
1481
1482         if (IS_ERR(cqr)) {
1483                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1484                            "Could not allocate PSF-SSC request");
1485                 return cqr;
1486         }
1487         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1488         psf_ssc_data->order = PSF_ORDER_SSC;
1489         psf_ssc_data->suborder = 0xc0;
1490         if (enable_pav) {
1491                 psf_ssc_data->suborder |= 0x08;
1492                 psf_ssc_data->reserved[0] = 0x88;
1493         }
1494         ccw = cqr->cpaddr;
1495         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1496         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1497         ccw->count = 66;
1498
1499         cqr->startdev = device;
1500         cqr->memdev = device;
1501         cqr->block = NULL;
1502         cqr->retries = 256;
1503         cqr->expires = 10*HZ;
1504         cqr->buildclk = get_clock();
1505         cqr->status = DASD_CQR_FILLED;
1506         return cqr;
1507 }
1508
1509 /*
1510  * Perform Subsystem Function.
1511  * It is necessary to trigger CIO for channel revalidation since this
1512  * call might change behaviour of DASD devices.
1513  */
1514 static int
1515 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1516                   unsigned long flags)
1517 {
1518         struct dasd_ccw_req *cqr;
1519         int rc;
1520
1521         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1522         if (IS_ERR(cqr))
1523                 return PTR_ERR(cqr);
1524
1525         /*
1526          * set flags e.g. turn on failfast, to prevent blocking
1527          * the calling function should handle failed requests
1528          */
1529         cqr->flags |= flags;
1530
1531         rc = dasd_sleep_on(cqr);
1532         if (!rc)
1533                 /* trigger CIO to reprobe devices */
1534                 css_schedule_reprobe();
1535         else if (cqr->intrc == -EAGAIN)
1536                 rc = -EAGAIN;
1537
1538         dasd_sfree_request(cqr, cqr->memdev);
1539         return rc;
1540 }
1541
1542 /*
1543  * Valide storage server of current device.
1544  */
1545 static int dasd_eckd_validate_server(struct dasd_device *device,
1546                                      unsigned long flags)
1547 {
1548         int rc;
1549         struct dasd_eckd_private *private;
1550         int enable_pav;
1551
1552         private = (struct dasd_eckd_private *) device->private;
1553         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1554             private->uid.type == UA_HYPER_PAV_ALIAS)
1555                 return 0;
1556         if (dasd_nopav || MACHINE_IS_VM)
1557                 enable_pav = 0;
1558         else
1559                 enable_pav = 1;
1560         rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1561
1562         /* may be requested feature is not available on server,
1563          * therefore just report error and go ahead */
1564         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1565                         "returned rc=%d", private->uid.ssid, rc);
1566         return rc;
1567 }
1568
1569 /*
1570  * worker to do a validate server in case of a lost pathgroup
1571  */
1572 static void dasd_eckd_do_validate_server(struct work_struct *work)
1573 {
1574         struct dasd_device *device = container_of(work, struct dasd_device,
1575                                                   kick_validate);
1576         if (dasd_eckd_validate_server(device, DASD_CQR_FLAGS_FAILFAST)
1577             == -EAGAIN) {
1578                 /* schedule worker again if failed */
1579                 schedule_work(&device->kick_validate);
1580                 return;
1581         }
1582
1583         dasd_put_device(device);
1584 }
1585
1586 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1587 {
1588         dasd_get_device(device);
1589         /* exit if device not online or in offline processing */
1590         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1591            device->state < DASD_STATE_ONLINE) {
1592                 dasd_put_device(device);
1593                 return;
1594         }
1595         /* queue call to do_validate_server to the kernel event daemon. */
1596         schedule_work(&device->kick_validate);
1597 }
1598
1599 static u32 get_fcx_max_data(struct dasd_device *device)
1600 {
1601 #if defined(CONFIG_64BIT)
1602         int tpm, mdc;
1603         int fcx_in_css, fcx_in_gneq, fcx_in_features;
1604         struct dasd_eckd_private *private;
1605
1606         if (dasd_nofcx)
1607                 return 0;
1608         /* is transport mode supported? */
1609         private = (struct dasd_eckd_private *) device->private;
1610         fcx_in_css = css_general_characteristics.fcx;
1611         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1612         fcx_in_features = private->features.feature[40] & 0x80;
1613         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1614
1615         if (!tpm)
1616                 return 0;
1617
1618         mdc = ccw_device_get_mdc(device->cdev, 0);
1619         if (mdc < 0) {
1620                 dev_warn(&device->cdev->dev, "Detecting the maximum supported"
1621                          " data size for zHPF requests failed\n");
1622                 return 0;
1623         } else
1624                 return mdc * FCX_MAX_DATA_FACTOR;
1625 #else
1626         return 0;
1627 #endif
1628 }
1629
1630 /*
1631  * Check device characteristics.
1632  * If the device is accessible using ECKD discipline, the device is enabled.
1633  */
1634 static int
1635 dasd_eckd_check_characteristics(struct dasd_device *device)
1636 {
1637         struct dasd_eckd_private *private;
1638         struct dasd_block *block;
1639         struct dasd_uid temp_uid;
1640         int rc, i;
1641         int readonly;
1642         unsigned long value;
1643
1644         /* setup work queue for validate server*/
1645         INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1646
1647         if (!ccw_device_is_pathgroup(device->cdev)) {
1648                 dev_warn(&device->cdev->dev,
1649                          "A channel path group could not be established\n");
1650                 return -EIO;
1651         }
1652         if (!ccw_device_is_multipath(device->cdev)) {
1653                 dev_info(&device->cdev->dev,
1654                          "The DASD is not operating in multipath mode\n");
1655         }
1656         private = (struct dasd_eckd_private *) device->private;
1657         if (!private) {
1658                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1659                 if (!private) {
1660                         dev_warn(&device->cdev->dev,
1661                                  "Allocating memory for private DASD data "
1662                                  "failed\n");
1663                         return -ENOMEM;
1664                 }
1665                 device->private = (void *) private;
1666         } else {
1667                 memset(private, 0, sizeof(*private));
1668         }
1669         /* Invalidate status of initial analysis. */
1670         private->init_cqr_status = -1;
1671         /* Set default cache operations. */
1672         private->attrib.operation = DASD_NORMAL_CACHE;
1673         private->attrib.nr_cyl = 0;
1674
1675         /* Read Configuration Data */
1676         rc = dasd_eckd_read_conf(device);
1677         if (rc)
1678                 goto out_err1;
1679
1680         /* set default timeout */
1681         device->default_expires = DASD_EXPIRES;
1682         if (private->gneq) {
1683                 value = 1;
1684                 for (i = 0; i < private->gneq->timeout.value; i++)
1685                         value = 10 * value;
1686                 value = value * private->gneq->timeout.number;
1687                 /* do not accept useless values */
1688                 if (value != 0 && value <= DASD_EXPIRES_MAX)
1689                         device->default_expires = value;
1690         }
1691
1692         dasd_eckd_get_uid(device, &temp_uid);
1693         if (temp_uid.type == UA_BASE_DEVICE) {
1694                 block = dasd_alloc_block();
1695                 if (IS_ERR(block)) {
1696                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1697                                         "could not allocate dasd "
1698                                         "block structure");
1699                         rc = PTR_ERR(block);
1700                         goto out_err1;
1701                 }
1702                 device->block = block;
1703                 block->base = device;
1704         }
1705
1706         /* register lcu with alias handling, enable PAV */
1707         rc = dasd_alias_make_device_known_to_lcu(device);
1708         if (rc)
1709                 goto out_err2;
1710
1711         dasd_eckd_validate_server(device, 0);
1712
1713         /* device may report different configuration data after LCU setup */
1714         rc = dasd_eckd_read_conf(device);
1715         if (rc)
1716                 goto out_err3;
1717
1718         /* Read Feature Codes */
1719         dasd_eckd_read_features(device);
1720
1721         /* Read Device Characteristics */
1722         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1723                                          &private->rdc_data, 64);
1724         if (rc) {
1725                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1726                                 "Read device characteristic failed, rc=%d", rc);
1727                 goto out_err3;
1728         }
1729
1730         if ((device->features & DASD_FEATURE_USERAW) &&
1731             !(private->rdc_data.facilities.RT_in_LR)) {
1732                 dev_err(&device->cdev->dev, "The storage server does not "
1733                         "support raw-track access\n");
1734                 rc = -EINVAL;
1735                 goto out_err3;
1736         }
1737
1738         /* find the valid cylinder size */
1739         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1740             private->rdc_data.long_no_cyl)
1741                 private->real_cyl = private->rdc_data.long_no_cyl;
1742         else
1743                 private->real_cyl = private->rdc_data.no_cyl;
1744
1745         private->fcx_max_data = get_fcx_max_data(device);
1746
1747         readonly = dasd_device_is_ro(device);
1748         if (readonly)
1749                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1750
1751         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1752                  "with %d cylinders, %d heads, %d sectors%s\n",
1753                  private->rdc_data.dev_type,
1754                  private->rdc_data.dev_model,
1755                  private->rdc_data.cu_type,
1756                  private->rdc_data.cu_model.model,
1757                  private->real_cyl,
1758                  private->rdc_data.trk_per_cyl,
1759                  private->rdc_data.sec_per_trk,
1760                  readonly ? ", read-only device" : "");
1761         return 0;
1762
1763 out_err3:
1764         dasd_alias_disconnect_device_from_lcu(device);
1765 out_err2:
1766         dasd_free_block(device->block);
1767         device->block = NULL;
1768 out_err1:
1769         kfree(private->conf_data);
1770         kfree(device->private);
1771         device->private = NULL;
1772         return rc;
1773 }
1774
1775 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1776 {
1777         struct dasd_eckd_private *private;
1778
1779         private = (struct dasd_eckd_private *) device->private;
1780         dasd_alias_disconnect_device_from_lcu(device);
1781         private->ned = NULL;
1782         private->sneq = NULL;
1783         private->vdsneq = NULL;
1784         private->gneq = NULL;
1785         private->conf_len = 0;
1786         kfree(private->conf_data);
1787         private->conf_data = NULL;
1788 }
1789
1790 static struct dasd_ccw_req *
1791 dasd_eckd_analysis_ccw(struct dasd_device *device)
1792 {
1793         struct dasd_eckd_private *private;
1794         struct eckd_count *count_data;
1795         struct LO_eckd_data *LO_data;
1796         struct dasd_ccw_req *cqr;
1797         struct ccw1 *ccw;
1798         int cplength, datasize;
1799         int i;
1800
1801         private = (struct dasd_eckd_private *) device->private;
1802
1803         cplength = 8;
1804         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1805         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1806         if (IS_ERR(cqr))
1807                 return cqr;
1808         ccw = cqr->cpaddr;
1809         /* Define extent for the first 3 tracks. */
1810         define_extent(ccw++, cqr->data, 0, 2,
1811                       DASD_ECKD_CCW_READ_COUNT, device);
1812         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1813         /* Locate record for the first 4 records on track 0. */
1814         ccw[-1].flags |= CCW_FLAG_CC;
1815         locate_record(ccw++, LO_data++, 0, 0, 4,
1816                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1817
1818         count_data = private->count_area;
1819         for (i = 0; i < 4; i++) {
1820                 ccw[-1].flags |= CCW_FLAG_CC;
1821                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1822                 ccw->flags = 0;
1823                 ccw->count = 8;
1824                 ccw->cda = (__u32)(addr_t) count_data;
1825                 ccw++;
1826                 count_data++;
1827         }
1828
1829         /* Locate record for the first record on track 2. */
1830         ccw[-1].flags |= CCW_FLAG_CC;
1831         locate_record(ccw++, LO_data++, 2, 0, 1,
1832                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1833         /* Read count ccw. */
1834         ccw[-1].flags |= CCW_FLAG_CC;
1835         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1836         ccw->flags = 0;
1837         ccw->count = 8;
1838         ccw->cda = (__u32)(addr_t) count_data;
1839
1840         cqr->block = NULL;
1841         cqr->startdev = device;
1842         cqr->memdev = device;
1843         cqr->retries = 255;
1844         cqr->buildclk = get_clock();
1845         cqr->status = DASD_CQR_FILLED;
1846         return cqr;
1847 }
1848
1849 /* differentiate between 'no record found' and any other error */
1850 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1851 {
1852         char *sense;
1853         if (init_cqr->status == DASD_CQR_DONE)
1854                 return INIT_CQR_OK;
1855         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1856                  init_cqr->status == DASD_CQR_FAILED) {
1857                 sense = dasd_get_sense(&init_cqr->irb);
1858                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1859                         return INIT_CQR_UNFORMATTED;
1860                 else
1861                         return INIT_CQR_ERROR;
1862         } else
1863                 return INIT_CQR_ERROR;
1864 }
1865
1866 /*
1867  * This is the callback function for the init_analysis cqr. It saves
1868  * the status of the initial analysis ccw before it frees it and kicks
1869  * the device to continue the startup sequence. This will call
1870  * dasd_eckd_do_analysis again (if the devices has not been marked
1871  * for deletion in the meantime).
1872  */
1873 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1874                                         void *data)
1875 {
1876         struct dasd_eckd_private *private;
1877         struct dasd_device *device;
1878
1879         device = init_cqr->startdev;
1880         private = (struct dasd_eckd_private *) device->private;
1881         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1882         dasd_sfree_request(init_cqr, device);
1883         dasd_kick_device(device);
1884 }
1885
1886 static int dasd_eckd_start_analysis(struct dasd_block *block)
1887 {
1888         struct dasd_ccw_req *init_cqr;
1889
1890         init_cqr = dasd_eckd_analysis_ccw(block->base);
1891         if (IS_ERR(init_cqr))
1892                 return PTR_ERR(init_cqr);
1893         init_cqr->callback = dasd_eckd_analysis_callback;
1894         init_cqr->callback_data = NULL;
1895         init_cqr->expires = 5*HZ;
1896         /* first try without ERP, so we can later handle unformatted
1897          * devices as special case
1898          */
1899         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1900         init_cqr->retries = 0;
1901         dasd_add_request_head(init_cqr);
1902         return -EAGAIN;
1903 }
1904
1905 static int dasd_eckd_end_analysis(struct dasd_block *block)
1906 {
1907         struct dasd_device *device;
1908         struct dasd_eckd_private *private;
1909         struct eckd_count *count_area;
1910         unsigned int sb, blk_per_trk;
1911         int status, i;
1912         struct dasd_ccw_req *init_cqr;
1913
1914         device = block->base;
1915         private = (struct dasd_eckd_private *) device->private;
1916         status = private->init_cqr_status;
1917         private->init_cqr_status = -1;
1918         if (status == INIT_CQR_ERROR) {
1919                 /* try again, this time with full ERP */
1920                 init_cqr = dasd_eckd_analysis_ccw(device);
1921                 dasd_sleep_on(init_cqr);
1922                 status = dasd_eckd_analysis_evaluation(init_cqr);
1923                 dasd_sfree_request(init_cqr, device);
1924         }
1925
1926         if (device->features & DASD_FEATURE_USERAW) {
1927                 block->bp_block = DASD_RAW_BLOCKSIZE;
1928                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1929                 block->s2b_shift = 3;
1930                 goto raw;
1931         }
1932
1933         if (status == INIT_CQR_UNFORMATTED) {
1934                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1935                 return -EMEDIUMTYPE;
1936         } else if (status == INIT_CQR_ERROR) {
1937                 dev_err(&device->cdev->dev,
1938                         "Detecting the DASD disk layout failed because "
1939                         "of an I/O error\n");
1940                 return -EIO;
1941         }
1942
1943         private->uses_cdl = 1;
1944         /* Check Track 0 for Compatible Disk Layout */
1945         count_area = NULL;
1946         for (i = 0; i < 3; i++) {
1947                 if (private->count_area[i].kl != 4 ||
1948                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
1949                     private->count_area[i].cyl != 0 ||
1950                     private->count_area[i].head != count_area_head[i] ||
1951                     private->count_area[i].record != count_area_rec[i]) {
1952                         private->uses_cdl = 0;
1953                         break;
1954                 }
1955         }
1956         if (i == 3)
1957                 count_area = &private->count_area[4];
1958
1959         if (private->uses_cdl == 0) {
1960                 for (i = 0; i < 5; i++) {
1961                         if ((private->count_area[i].kl != 0) ||
1962                             (private->count_area[i].dl !=
1963                              private->count_area[0].dl) ||
1964                             private->count_area[i].cyl !=  0 ||
1965                             private->count_area[i].head != count_area_head[i] ||
1966                             private->count_area[i].record != count_area_rec[i])
1967                                 break;
1968                 }
1969                 if (i == 5)
1970                         count_area = &private->count_area[0];
1971         } else {
1972                 if (private->count_area[3].record == 1)
1973                         dev_warn(&device->cdev->dev,
1974                                  "Track 0 has no records following the VTOC\n");
1975         }
1976
1977         if (count_area != NULL && count_area->kl == 0) {
1978                 /* we found notthing violating our disk layout */
1979                 if (dasd_check_blocksize(count_area->dl) == 0)
1980                         block->bp_block = count_area->dl;
1981         }
1982         if (block->bp_block == 0) {
1983                 dev_warn(&device->cdev->dev,
1984                          "The disk layout of the DASD is not supported\n");
1985                 return -EMEDIUMTYPE;
1986         }
1987         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1988         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1989                 block->s2b_shift++;
1990
1991         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1992
1993 raw:
1994         block->blocks = (private->real_cyl *
1995                           private->rdc_data.trk_per_cyl *
1996                           blk_per_trk);
1997
1998         dev_info(&device->cdev->dev,
1999                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
2000                  "%s\n", (block->bp_block >> 10),
2001                  ((private->real_cyl *
2002                    private->rdc_data.trk_per_cyl *
2003                    blk_per_trk * (block->bp_block >> 9)) >> 1),
2004                  ((blk_per_trk * block->bp_block) >> 10),
2005                  private->uses_cdl ?
2006                  "compatible disk layout" : "linux disk layout");
2007
2008         return 0;
2009 }
2010
2011 static int dasd_eckd_do_analysis(struct dasd_block *block)
2012 {
2013         struct dasd_eckd_private *private;
2014
2015         private = (struct dasd_eckd_private *) block->base->private;
2016         if (private->init_cqr_status < 0)
2017                 return dasd_eckd_start_analysis(block);
2018         else
2019                 return dasd_eckd_end_analysis(block);
2020 }
2021
2022 static int dasd_eckd_ready_to_online(struct dasd_device *device)
2023 {
2024         return dasd_alias_add_device(device);
2025 };
2026
2027 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2028 {
2029         cancel_work_sync(&device->reload_device);
2030         cancel_work_sync(&device->kick_validate);
2031         return dasd_alias_remove_device(device);
2032 };
2033
2034 static int
2035 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2036 {
2037         struct dasd_eckd_private *private;
2038
2039         private = (struct dasd_eckd_private *) block->base->private;
2040         if (dasd_check_blocksize(block->bp_block) == 0) {
2041                 geo->sectors = recs_per_track(&private->rdc_data,
2042                                               0, block->bp_block);
2043         }
2044         geo->cylinders = private->rdc_data.no_cyl;
2045         geo->heads = private->rdc_data.trk_per_cyl;
2046         return 0;
2047 }
2048
2049 static struct dasd_ccw_req *
2050 dasd_eckd_format_device(struct dasd_device * device,
2051                         struct format_data_t * fdata)
2052 {
2053         struct dasd_eckd_private *private;
2054         struct dasd_ccw_req *fcp;
2055         struct eckd_count *ect;
2056         struct ccw1 *ccw;
2057         void *data;
2058         int rpt;
2059         struct ch_t address;
2060         int cplength, datasize;
2061         int i;
2062         int intensity = 0;
2063         int r0_perm;
2064
2065         private = (struct dasd_eckd_private *) device->private;
2066         rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
2067         set_ch_t(&address,
2068                  fdata->start_unit / private->rdc_data.trk_per_cyl,
2069                  fdata->start_unit % private->rdc_data.trk_per_cyl);
2070
2071         /* Sanity checks. */
2072         if (fdata->start_unit >=
2073             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2074                 dev_warn(&device->cdev->dev, "Start track number %d used in "
2075                          "formatting is too big\n", fdata->start_unit);
2076                 return ERR_PTR(-EINVAL);
2077         }
2078         if (fdata->start_unit > fdata->stop_unit) {
2079                 dev_warn(&device->cdev->dev, "Start track %d used in "
2080                          "formatting exceeds end track\n", fdata->start_unit);
2081                 return ERR_PTR(-EINVAL);
2082         }
2083         if (dasd_check_blocksize(fdata->blksize) != 0) {
2084                 dev_warn(&device->cdev->dev,
2085                          "The DASD cannot be formatted with block size %d\n",
2086                          fdata->blksize);
2087                 return ERR_PTR(-EINVAL);
2088         }
2089
2090         /*
2091          * fdata->intensity is a bit string that tells us what to do:
2092          *   Bit 0: write record zero
2093          *   Bit 1: write home address, currently not supported
2094          *   Bit 2: invalidate tracks
2095          *   Bit 3: use OS/390 compatible disk layout (cdl)
2096          *   Bit 4: do not allow storage subsystem to modify record zero
2097          * Only some bit combinations do make sense.
2098          */
2099         if (fdata->intensity & 0x10) {
2100                 r0_perm = 0;
2101                 intensity = fdata->intensity & ~0x10;
2102         } else {
2103                 r0_perm = 1;
2104                 intensity = fdata->intensity;
2105         }
2106         switch (intensity) {
2107         case 0x00:      /* Normal format */
2108         case 0x08:      /* Normal format, use cdl. */
2109                 cplength = 2 + rpt;
2110                 datasize = sizeof(struct DE_eckd_data) +
2111                         sizeof(struct LO_eckd_data) +
2112                         rpt * sizeof(struct eckd_count);
2113                 break;
2114         case 0x01:      /* Write record zero and format track. */
2115         case 0x09:      /* Write record zero and format track, use cdl. */
2116                 cplength = 3 + rpt;
2117                 datasize = sizeof(struct DE_eckd_data) +
2118                         sizeof(struct LO_eckd_data) +
2119                         sizeof(struct eckd_count) +
2120                         rpt * sizeof(struct eckd_count);
2121                 break;
2122         case 0x04:      /* Invalidate track. */
2123         case 0x0c:      /* Invalidate track, use cdl. */
2124                 cplength = 3;
2125                 datasize = sizeof(struct DE_eckd_data) +
2126                         sizeof(struct LO_eckd_data) +
2127                         sizeof(struct eckd_count);
2128                 break;
2129         default:
2130                 dev_warn(&device->cdev->dev, "An I/O control call used "
2131                          "incorrect flags 0x%x\n", fdata->intensity);
2132                 return ERR_PTR(-EINVAL);
2133         }
2134         /* Allocate the format ccw request. */
2135         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
2136         if (IS_ERR(fcp))
2137                 return fcp;
2138
2139         data = fcp->data;
2140         ccw = fcp->cpaddr;
2141
2142         switch (intensity & ~0x08) {
2143         case 0x00: /* Normal format. */
2144                 define_extent(ccw++, (struct DE_eckd_data *) data,
2145                               fdata->start_unit, fdata->start_unit,
2146                               DASD_ECKD_CCW_WRITE_CKD, device);
2147                 /* grant subsystem permission to format R0 */
2148                 if (r0_perm)
2149                         ((struct DE_eckd_data *)data)->ga_extended |= 0x04;
2150                 data += sizeof(struct DE_eckd_data);
2151                 ccw[-1].flags |= CCW_FLAG_CC;
2152                 locate_record(ccw++, (struct LO_eckd_data *) data,
2153                               fdata->start_unit, 0, rpt,
2154                               DASD_ECKD_CCW_WRITE_CKD, device,
2155                               fdata->blksize);
2156                 data += sizeof(struct LO_eckd_data);
2157                 break;
2158         case 0x01: /* Write record zero + format track. */
2159                 define_extent(ccw++, (struct DE_eckd_data *) data,
2160                               fdata->start_unit, fdata->start_unit,
2161                               DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2162                               device);
2163                 data += sizeof(struct DE_eckd_data);
2164                 ccw[-1].flags |= CCW_FLAG_CC;
2165                 locate_record(ccw++, (struct LO_eckd_data *) data,
2166                               fdata->start_unit, 0, rpt + 1,
2167                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
2168                               device->block->bp_block);
2169                 data += sizeof(struct LO_eckd_data);
2170                 break;
2171         case 0x04: /* Invalidate track. */
2172                 define_extent(ccw++, (struct DE_eckd_data *) data,
2173                               fdata->start_unit, fdata->start_unit,
2174                               DASD_ECKD_CCW_WRITE_CKD, device);
2175                 data += sizeof(struct DE_eckd_data);
2176                 ccw[-1].flags |= CCW_FLAG_CC;
2177                 locate_record(ccw++, (struct LO_eckd_data *) data,
2178                               fdata->start_unit, 0, 1,
2179                               DASD_ECKD_CCW_WRITE_CKD, device, 8);
2180                 data += sizeof(struct LO_eckd_data);
2181                 break;
2182         }
2183         if (intensity & 0x01) { /* write record zero */
2184                 ect = (struct eckd_count *) data;
2185                 data += sizeof(struct eckd_count);
2186                 ect->cyl = address.cyl;
2187                 ect->head = address.head;
2188                 ect->record = 0;
2189                 ect->kl = 0;
2190                 ect->dl = 8;
2191                 ccw[-1].flags |= CCW_FLAG_CC;
2192                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2193                 ccw->flags = CCW_FLAG_SLI;
2194                 ccw->count = 8;
2195                 ccw->cda = (__u32)(addr_t) ect;
2196                 ccw++;
2197         }
2198         if ((intensity & ~0x08) & 0x04) {       /* erase track */
2199                 ect = (struct eckd_count *) data;
2200                 data += sizeof(struct eckd_count);
2201                 ect->cyl = address.cyl;
2202                 ect->head = address.head;
2203                 ect->record = 1;
2204                 ect->kl = 0;
2205                 ect->dl = 0;
2206                 ccw[-1].flags |= CCW_FLAG_CC;
2207                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2208                 ccw->flags = CCW_FLAG_SLI;
2209                 ccw->count = 8;
2210                 ccw->cda = (__u32)(addr_t) ect;
2211         } else {                /* write remaining records */
2212                 for (i = 0; i < rpt; i++) {
2213                         ect = (struct eckd_count *) data;
2214                         data += sizeof(struct eckd_count);
2215                         ect->cyl = address.cyl;
2216                         ect->head = address.head;
2217                         ect->record = i + 1;
2218                         ect->kl = 0;
2219                         ect->dl = fdata->blksize;
2220                         /* Check for special tracks 0-1 when formatting CDL */
2221                         if ((intensity & 0x08) &&
2222                             fdata->start_unit == 0) {
2223                                 if (i < 3) {
2224                                         ect->kl = 4;
2225                                         ect->dl = sizes_trk0[i] - 4;
2226                                 }
2227                         }
2228                         if ((intensity & 0x08) &&
2229                             fdata->start_unit == 1) {
2230                                 ect->kl = 44;
2231                                 ect->dl = LABEL_SIZE - 44;
2232                         }
2233                         ccw[-1].flags |= CCW_FLAG_CC;
2234                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2235                         ccw->flags = CCW_FLAG_SLI;
2236                         ccw->count = 8;
2237                         ccw->cda = (__u32)(addr_t) ect;
2238                         ccw++;
2239                 }
2240         }
2241         fcp->startdev = device;
2242         fcp->memdev = device;
2243         fcp->retries = 256;
2244         fcp->buildclk = get_clock();
2245         fcp->status = DASD_CQR_FILLED;
2246         return fcp;
2247 }
2248
2249 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2250 {
2251         cqr->status = DASD_CQR_FILLED;
2252         if (cqr->block && (cqr->startdev != cqr->block->base)) {
2253                 dasd_eckd_reset_ccw_to_base_io(cqr);
2254                 cqr->startdev = cqr->block->base;
2255                 cqr->lpm = cqr->block->base->path_data.opm;
2256         }
2257 };
2258
2259 static dasd_erp_fn_t
2260 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2261 {
2262         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2263         struct ccw_device *cdev = device->cdev;
2264
2265         switch (cdev->id.cu_type) {
2266         case 0x3990:
2267         case 0x2105:
2268         case 0x2107:
2269         case 0x1750:
2270                 return dasd_3990_erp_action;
2271         case 0x9343:
2272         case 0x3880:
2273         default:
2274                 return dasd_default_erp_action;
2275         }
2276 }
2277
2278 static dasd_erp_fn_t
2279 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2280 {
2281         return dasd_default_erp_postaction;
2282 }
2283
2284 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2285                                               struct dasd_ccw_req *cqr,
2286                                               struct irb *irb)
2287 {
2288         char mask;
2289         char *sense = NULL;
2290         struct dasd_eckd_private *private;
2291
2292         private = (struct dasd_eckd_private *) device->private;
2293         /* first of all check for state change pending interrupt */
2294         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2295         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2296                 /*
2297                  * for alias only, not in offline processing
2298                  * and only if not suspended
2299                  */
2300                 if (!device->block && private->lcu &&
2301                     device->state == DASD_STATE_ONLINE &&
2302                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2303                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2304                         /*
2305                          * the state change could be caused by an alias
2306                          * reassignment remove device from alias handling
2307                          * to prevent new requests from being scheduled on
2308                          * the wrong alias device
2309                          */
2310                         dasd_alias_remove_device(device);
2311
2312                         /* schedule worker to reload device */
2313                         dasd_reload_device(device);
2314                 }
2315                 dasd_generic_handle_state_change(device);
2316                 return;
2317         }
2318
2319         sense = dasd_get_sense(irb);
2320         if (!sense)
2321                 return;
2322
2323         /* summary unit check */
2324         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2325             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2326                 dasd_alias_handle_summary_unit_check(device, irb);
2327                 return;
2328         }
2329
2330         /* service information message SIM */
2331         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
2332             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
2333                 dasd_3990_erp_handle_sim(device, sense);
2334                 return;
2335         }
2336
2337         /* loss of device reservation is handled via base devices only
2338          * as alias devices may be used with several bases
2339          */
2340         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
2341             (sense[7] == 0x3F) &&
2342             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
2343             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
2344                 if (device->features & DASD_FEATURE_FAILONSLCK)
2345                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
2346                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
2347                 dev_err(&device->cdev->dev,
2348                         "The device reservation was lost\n");
2349         }
2350 }
2351
2352 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
2353                                                struct dasd_device *startdev,
2354                                                struct dasd_block *block,
2355                                                struct request *req,
2356                                                sector_t first_rec,
2357                                                sector_t last_rec,
2358                                                sector_t first_trk,
2359                                                sector_t last_trk,
2360                                                unsigned int first_offs,
2361                                                unsigned int last_offs,
2362                                                unsigned int blk_per_trk,
2363                                                unsigned int blksize)
2364 {
2365         struct dasd_eckd_private *private;
2366         unsigned long *idaws;
2367         struct LO_eckd_data *LO_data;
2368         struct dasd_ccw_req *cqr;
2369         struct ccw1 *ccw;
2370         struct req_iterator iter;
2371         struct bio_vec *bv;
2372         char *dst;
2373         unsigned int off;
2374         int count, cidaw, cplength, datasize;
2375         sector_t recid;
2376         unsigned char cmd, rcmd;
2377         int use_prefix;
2378         struct dasd_device *basedev;
2379
2380         basedev = block->base;
2381         private = (struct dasd_eckd_private *) basedev->private;
2382         if (rq_data_dir(req) == READ)
2383                 cmd = DASD_ECKD_CCW_READ_MT;
2384         else if (rq_data_dir(req) == WRITE)
2385                 cmd = DASD_ECKD_CCW_WRITE_MT;
2386         else
2387                 return ERR_PTR(-EINVAL);
2388
2389         /* Check struct bio and count the number of blocks for the request. */
2390         count = 0;
2391         cidaw = 0;
2392         rq_for_each_segment(bv, req, iter) {
2393                 if (bv->bv_len & (blksize - 1))
2394                         /* Eckd can only do full blocks. */
2395                         return ERR_PTR(-EINVAL);
2396                 count += bv->bv_len >> (block->s2b_shift + 9);
2397 #if defined(CONFIG_64BIT)
2398                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
2399                         cidaw += bv->bv_len >> (block->s2b_shift + 9);
2400 #endif
2401         }
2402         /* Paranoia. */
2403         if (count != last_rec - first_rec + 1)
2404                 return ERR_PTR(-EINVAL);
2405
2406         /* use the prefix command if available */
2407         use_prefix = private->features.feature[8] & 0x01;
2408         if (use_prefix) {
2409                 /* 1x prefix + number of blocks */
2410                 cplength = 2 + count;
2411                 /* 1x prefix + cidaws*sizeof(long) */
2412                 datasize = sizeof(struct PFX_eckd_data) +
2413                         sizeof(struct LO_eckd_data) +
2414                         cidaw * sizeof(unsigned long);
2415         } else {
2416                 /* 1x define extent + 1x locate record + number of blocks */
2417                 cplength = 2 + count;
2418                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
2419                 datasize = sizeof(struct DE_eckd_data) +
2420                         sizeof(struct LO_eckd_data) +
2421                         cidaw * sizeof(unsigned long);
2422         }
2423         /* Find out the number of additional locate record ccws for cdl. */
2424         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
2425                 if (last_rec >= 2*blk_per_trk)
2426                         count = 2*blk_per_trk - first_rec;
2427                 cplength += count;
2428                 datasize += count*sizeof(struct LO_eckd_data);
2429         }
2430         /* Allocate the ccw request. */
2431         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2432                                    startdev);
2433         if (IS_ERR(cqr))
2434                 return cqr;
2435         ccw = cqr->cpaddr;
2436         /* First ccw is define extent or prefix. */
2437         if (use_prefix) {
2438                 if (prefix(ccw++, cqr->data, first_trk,
2439                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
2440                         /* Clock not in sync and XRC is enabled.
2441                          * Try again later.
2442                          */
2443                         dasd_sfree_request(cqr, startdev);
2444                         return ERR_PTR(-EAGAIN);
2445                 }
2446                 idaws = (unsigned long *) (cqr->data +
2447                                            sizeof(struct PFX_eckd_data));
2448         } else {
2449                 if (define_extent(ccw++, cqr->data, first_trk,
2450                                   last_trk, cmd, basedev) == -EAGAIN) {
2451                         /* Clock not in sync and XRC is enabled.
2452                          * Try again later.
2453                          */
2454                         dasd_sfree_request(cqr, startdev);
2455                         return ERR_PTR(-EAGAIN);
2456                 }
2457                 idaws = (unsigned long *) (cqr->data +
2458                                            sizeof(struct DE_eckd_data));
2459         }
2460         /* Build locate_record+read/write/ccws. */
2461         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
2462         recid = first_rec;
2463         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
2464                 /* Only standard blocks so there is just one locate record. */
2465                 ccw[-1].flags |= CCW_FLAG_CC;
2466                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
2467                               last_rec - recid + 1, cmd, basedev, blksize);
2468         }
2469         rq_for_each_segment(bv, req, iter) {
2470                 dst = page_address(bv->bv_page) + bv->bv_offset;
2471                 if (dasd_page_cache) {
2472                         char *copy = kmem_cache_alloc(dasd_page_cache,
2473                                                       GFP_DMA | __GFP_NOWARN);
2474                         if (copy && rq_data_dir(req) == WRITE)
2475                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
2476                         if (copy)
2477                                 dst = copy + bv->bv_offset;
2478                 }
2479                 for (off = 0; off < bv->bv_len; off += blksize) {
2480                         sector_t trkid = recid;
2481                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
2482                         rcmd = cmd;
2483                         count = blksize;
2484                         /* Locate record for cdl special block ? */
2485                         if (private->uses_cdl && recid < 2*blk_per_trk) {
2486                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
2487                                         rcmd |= 0x8;
2488                                         count = dasd_eckd_cdl_reclen(recid);
2489                                         if (count < blksize &&
2490                                             rq_data_dir(req) == READ)
2491                                                 memset(dst + count, 0xe5,
2492                                                        blksize - count);
2493                                 }
2494                                 ccw[-1].flags |= CCW_FLAG_CC;
2495                                 locate_record(ccw++, LO_data++,
2496                                               trkid, recoffs + 1,
2497                                               1, rcmd, basedev, count);
2498                         }
2499                         /* Locate record for standard blocks ? */
2500                         if (private->uses_cdl && recid == 2*blk_per_trk) {
2501                                 ccw[-1].flags |= CCW_FLAG_CC;
2502                                 locate_record(ccw++, LO_data++,
2503                                               trkid, recoffs + 1,
2504                                               last_rec - recid + 1,
2505                                               cmd, basedev, count);
2506                         }
2507                         /* Read/write ccw. */
2508                         ccw[-1].flags |= CCW_FLAG_CC;
2509                         ccw->cmd_code = rcmd;
2510                         ccw->count = count;
2511                         if (idal_is_needed(dst, blksize)) {
2512                                 ccw->cda = (__u32)(addr_t) idaws;
2513                                 ccw->flags = CCW_FLAG_IDA;
2514                                 idaws = idal_create_words(idaws, dst, blksize);
2515                         } else {
2516                                 ccw->cda = (__u32)(addr_t) dst;
2517                                 ccw->flags = 0;
2518                         }
2519                         ccw++;
2520                         dst += blksize;
2521                         recid++;
2522                 }
2523         }
2524         if (blk_noretry_request(req) ||
2525             block->base->features & DASD_FEATURE_FAILFAST)
2526                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2527         cqr->startdev = startdev;
2528         cqr->memdev = startdev;
2529         cqr->block = block;
2530         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2531         cqr->lpm = startdev->path_data.ppm;
2532         cqr->retries = 256;
2533         cqr->buildclk = get_clock();
2534         cqr->status = DASD_CQR_FILLED;
2535         return cqr;
2536 }
2537
2538 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
2539                                                struct dasd_device *startdev,
2540                                                struct dasd_block *block,
2541                                                struct request *req,
2542                                                sector_t first_rec,
2543                                                sector_t last_rec,
2544                                                sector_t first_trk,
2545                                                sector_t last_trk,
2546                                                unsigned int first_offs,
2547                                                unsigned int last_offs,
2548                                                unsigned int blk_per_trk,
2549                                                unsigned int blksize)
2550 {
2551         unsigned long *idaws;
2552         struct dasd_ccw_req *cqr;
2553         struct ccw1 *ccw;
2554         struct req_iterator iter;
2555         struct bio_vec *bv;
2556         char *dst, *idaw_dst;
2557         unsigned int cidaw, cplength, datasize;
2558         unsigned int tlf;
2559         sector_t recid;
2560         unsigned char cmd;
2561         struct dasd_device *basedev;
2562         unsigned int trkcount, count, count_to_trk_end;
2563         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
2564         unsigned char new_track, end_idaw;
2565         sector_t trkid;
2566         unsigned int recoffs;
2567
2568         basedev = block->base;
2569         if (rq_data_dir(req) == READ)
2570                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2571         else if (rq_data_dir(req) == WRITE)
2572                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2573         else
2574                 return ERR_PTR(-EINVAL);
2575
2576         /* Track based I/O needs IDAWs for each page, and not just for
2577          * 64 bit addresses. We need additional idals for pages
2578          * that get filled from two tracks, so we use the number
2579          * of records as upper limit.
2580          */
2581         cidaw = last_rec - first_rec + 1;
2582         trkcount = last_trk - first_trk + 1;
2583
2584         /* 1x prefix + one read/write ccw per track */
2585         cplength = 1 + trkcount;
2586
2587         /* on 31-bit we need space for two 32 bit addresses per page
2588          * on 64-bit one 64 bit address
2589          */
2590         datasize = sizeof(struct PFX_eckd_data) +
2591                 cidaw * sizeof(unsigned long long);
2592
2593         /* Allocate the ccw request. */
2594         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2595                                    startdev);
2596         if (IS_ERR(cqr))
2597                 return cqr;
2598         ccw = cqr->cpaddr;
2599         /* transfer length factor: how many bytes to read from the last track */
2600         if (first_trk == last_trk)
2601                 tlf = last_offs - first_offs + 1;
2602         else
2603                 tlf = last_offs + 1;
2604         tlf *= blksize;
2605
2606         if (prefix_LRE(ccw++, cqr->data, first_trk,
2607                        last_trk, cmd, basedev, startdev,
2608                        1 /* format */, first_offs + 1,
2609                        trkcount, blksize,
2610                        tlf) == -EAGAIN) {
2611                 /* Clock not in sync and XRC is enabled.
2612                  * Try again later.
2613                  */
2614                 dasd_sfree_request(cqr, startdev);
2615                 return ERR_PTR(-EAGAIN);
2616         }
2617
2618         /*
2619          * The translation of request into ccw programs must meet the
2620          * following conditions:
2621          * - all idaws but the first and the last must address full pages
2622          *   (or 2K blocks on 31-bit)
2623          * - the scope of a ccw and it's idal ends with the track boundaries
2624          */
2625         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2626         recid = first_rec;
2627         new_track = 1;
2628         end_idaw = 0;
2629         len_to_track_end = 0;
2630         idaw_dst = NULL;
2631         idaw_len = 0;
2632         rq_for_each_segment(bv, req, iter) {
2633                 dst = page_address(bv->bv_page) + bv->bv_offset;
2634                 seg_len = bv->bv_len;
2635                 while (seg_len) {
2636                         if (new_track) {
2637                                 trkid = recid;
2638                                 recoffs = sector_div(trkid, blk_per_trk);
2639                                 count_to_trk_end = blk_per_trk - recoffs;
2640                                 count = min((last_rec - recid + 1),
2641                                             (sector_t)count_to_trk_end);
2642                                 len_to_track_end = count * blksize;
2643                                 ccw[-1].flags |= CCW_FLAG_CC;
2644                                 ccw->cmd_code = cmd;
2645                                 ccw->count = len_to_track_end;
2646                                 ccw->cda = (__u32)(addr_t)idaws;
2647                                 ccw->flags = CCW_FLAG_IDA;
2648                                 ccw++;
2649                                 recid += count;
2650                                 new_track = 0;
2651                                 /* first idaw for a ccw may start anywhere */
2652                                 if (!idaw_dst)
2653                                         idaw_dst = dst;
2654                         }
2655                         /* If we start a new idaw, we must make sure that it
2656                          * starts on an IDA_BLOCK_SIZE boundary.
2657                          * If we continue an idaw, we must make sure that the
2658                          * current segment begins where the so far accumulated
2659                          * idaw ends
2660                          */
2661                         if (!idaw_dst) {
2662                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2663                                         dasd_sfree_request(cqr, startdev);
2664                                         return ERR_PTR(-ERANGE);
2665                                 } else
2666                                         idaw_dst = dst;
2667                         }
2668                         if ((idaw_dst + idaw_len) != dst) {
2669                                 dasd_sfree_request(cqr, startdev);
2670                                 return ERR_PTR(-ERANGE);
2671                         }
2672                         part_len = min(seg_len, len_to_track_end);
2673                         seg_len -= part_len;
2674                         dst += part_len;
2675                         idaw_len += part_len;
2676                         len_to_track_end -= part_len;
2677                         /* collected memory area ends on an IDA_BLOCK border,
2678                          * -> create an idaw
2679                          * idal_create_words will handle cases where idaw_len
2680                          * is larger then IDA_BLOCK_SIZE
2681                          */
2682                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2683                                 end_idaw = 1;
2684                         /* We also need to end the idaw at track end */
2685                         if (!len_to_track_end) {
2686                                 new_track = 1;
2687                                 end_idaw = 1;
2688                         }
2689                         if (end_idaw) {
2690                                 idaws = idal_create_words(idaws, idaw_dst,
2691                                                           idaw_len);
2692                                 idaw_dst = NULL;
2693                                 idaw_len = 0;
2694                                 end_idaw = 0;
2695                         }
2696                 }
2697         }
2698
2699         if (blk_noretry_request(req) ||
2700             block->base->features & DASD_FEATURE_FAILFAST)
2701                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2702         cqr->startdev = startdev;
2703         cqr->memdev = startdev;
2704         cqr->block = block;
2705         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2706         cqr->lpm = startdev->path_data.ppm;
2707         cqr->retries = 256;
2708         cqr->buildclk = get_clock();
2709         cqr->status = DASD_CQR_FILLED;
2710         return cqr;
2711 }
2712
2713 static int prepare_itcw(struct itcw *itcw,
2714                         unsigned int trk, unsigned int totrk, int cmd,
2715                         struct dasd_device *basedev,
2716                         struct dasd_device *startdev,
2717                         unsigned int rec_on_trk, int count,
2718                         unsigned int blksize,
2719                         unsigned int total_data_size,
2720                         unsigned int tlf,
2721                         unsigned int blk_per_trk)
2722 {
2723         struct PFX_eckd_data pfxdata;
2724         struct dasd_eckd_private *basepriv, *startpriv;
2725         struct DE_eckd_data *dedata;
2726         struct LRE_eckd_data *lredata;
2727         struct dcw *dcw;
2728
2729         u32 begcyl, endcyl;
2730         u16 heads, beghead, endhead;
2731         u8 pfx_cmd;
2732
2733         int rc = 0;
2734         int sector = 0;
2735         int dn, d;
2736
2737
2738         /* setup prefix data */
2739         basepriv = (struct dasd_eckd_private *) basedev->private;
2740         startpriv = (struct dasd_eckd_private *) startdev->private;
2741         dedata = &pfxdata.define_extent;
2742         lredata = &pfxdata.locate_record;
2743
2744         memset(&pfxdata, 0, sizeof(pfxdata));
2745         pfxdata.format = 1; /* PFX with LRE */
2746         pfxdata.base_address = basepriv->ned->unit_addr;
2747         pfxdata.base_lss = basepriv->ned->ID;
2748         pfxdata.validity.define_extent = 1;
2749
2750         /* private uid is kept up to date, conf_data may be outdated */
2751         if (startpriv->uid.type != UA_BASE_DEVICE) {
2752                 pfxdata.validity.verify_base = 1;
2753                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2754                         pfxdata.validity.hyper_pav = 1;
2755         }
2756
2757         switch (cmd) {
2758         case DASD_ECKD_CCW_READ_TRACK_DATA:
2759                 dedata->mask.perm = 0x1;
2760                 dedata->attributes.operation = basepriv->attrib.operation;
2761                 dedata->blk_size = blksize;
2762                 dedata->ga_extended |= 0x42;
2763                 lredata->operation.orientation = 0x0;
2764                 lredata->operation.operation = 0x0C;
2765                 lredata->auxiliary.check_bytes = 0x01;
2766                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2767                 break;
2768         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2769                 dedata->mask.perm = 0x02;
2770                 dedata->attributes.operation = basepriv->attrib.operation;
2771                 dedata->blk_size = blksize;
2772                 rc = check_XRC_on_prefix(&pfxdata, basedev);
2773                 dedata->ga_extended |= 0x42;
2774                 lredata->operation.orientation = 0x0;
2775                 lredata->operation.operation = 0x3F;
2776                 lredata->extended_operation = 0x23;
2777                 lredata->auxiliary.check_bytes = 0x2;
2778                 pfx_cmd = DASD_ECKD_CCW_PFX;
2779                 break;
2780         default:
2781                 DBF_DEV_EVENT(DBF_ERR, basedev,
2782                               "prepare itcw, unknown opcode 0x%x", cmd);
2783                 BUG();
2784                 break;
2785         }
2786         if (rc)
2787                 return rc;
2788
2789         dedata->attributes.mode = 0x3;  /* ECKD */
2790
2791         heads = basepriv->rdc_data.trk_per_cyl;
2792         begcyl = trk / heads;
2793         beghead = trk % heads;
2794         endcyl = totrk / heads;
2795         endhead = totrk % heads;
2796
2797         /* check for sequential prestage - enhance cylinder range */
2798         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2799             dedata->attributes.operation == DASD_SEQ_ACCESS) {
2800
2801                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2802                         endcyl += basepriv->attrib.nr_cyl;
2803                 else
2804                         endcyl = (basepriv->real_cyl - 1);
2805         }
2806
2807         set_ch_t(&dedata->beg_ext, begcyl, beghead);
2808         set_ch_t(&dedata->end_ext, endcyl, endhead);
2809
2810         dedata->ep_format = 0x20; /* records per track is valid */
2811         dedata->ep_rec_per_track = blk_per_trk;
2812
2813         if (rec_on_trk) {
2814                 switch (basepriv->rdc_data.dev_type) {
2815                 case 0x3390:
2816                         dn = ceil_quot(blksize + 6, 232);
2817                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
2818                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
2819                         break;
2820                 case 0x3380:
2821                         d = 7 + ceil_quot(blksize + 12, 32);
2822                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
2823                         break;
2824                 }
2825         }
2826
2827         lredata->auxiliary.length_valid = 1;
2828         lredata->auxiliary.length_scope = 1;
2829         lredata->auxiliary.imbedded_ccw_valid = 1;
2830         lredata->length = tlf;
2831         lredata->imbedded_ccw = cmd;
2832         lredata->count = count;
2833         lredata->sector = sector;
2834         set_ch_t(&lredata->seek_addr, begcyl, beghead);
2835         lredata->search_arg.cyl = lredata->seek_addr.cyl;
2836         lredata->search_arg.head = lredata->seek_addr.head;
2837         lredata->search_arg.record = rec_on_trk;
2838
2839         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
2840                      &pfxdata, sizeof(pfxdata), total_data_size);
2841         return IS_ERR(dcw) ? PTR_ERR(dcw) : 0;
2842 }
2843
2844 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
2845                                                struct dasd_device *startdev,
2846                                                struct dasd_block *block,
2847                                                struct request *req,
2848                                                sector_t first_rec,
2849                                                sector_t last_rec,
2850                                                sector_t first_trk,
2851                                                sector_t last_trk,
2852                                                unsigned int first_offs,
2853                                                unsigned int last_offs,
2854                                                unsigned int blk_per_trk,
2855                                                unsigned int blksize)
2856 {
2857         struct dasd_ccw_req *cqr;
2858         struct req_iterator iter;
2859         struct bio_vec *bv;
2860         char *dst;
2861         unsigned int trkcount, ctidaw;
2862         unsigned char cmd;
2863         struct dasd_device *basedev;
2864         unsigned int tlf;
2865         struct itcw *itcw;
2866         struct tidaw *last_tidaw = NULL;
2867         int itcw_op;
2868         size_t itcw_size;
2869         u8 tidaw_flags;
2870         unsigned int seg_len, part_len, len_to_track_end;
2871         unsigned char new_track;
2872         sector_t recid, trkid;
2873         unsigned int offs;
2874         unsigned int count, count_to_trk_end;
2875         int ret;
2876
2877         basedev = block->base;
2878         if (rq_data_dir(req) == READ) {
2879                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2880                 itcw_op = ITCW_OP_READ;
2881         } else if (rq_data_dir(req) == WRITE) {
2882                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2883                 itcw_op = ITCW_OP_WRITE;
2884         } else
2885                 return ERR_PTR(-EINVAL);
2886
2887         /* trackbased I/O needs address all memory via TIDAWs,
2888          * not just for 64 bit addresses. This allows us to map
2889          * each segment directly to one tidaw.
2890          * In the case of write requests, additional tidaws may
2891          * be needed when a segment crosses a track boundary.
2892          */
2893         trkcount = last_trk - first_trk + 1;
2894         ctidaw = 0;
2895         rq_for_each_segment(bv, req, iter) {
2896                 ++ctidaw;
2897         }
2898         if (rq_data_dir(req) == WRITE)
2899                 ctidaw += (last_trk - first_trk);
2900
2901         /* Allocate the ccw request. */
2902         itcw_size = itcw_calc_size(0, ctidaw, 0);
2903         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2904         if (IS_ERR(cqr))
2905                 return cqr;
2906
2907         /* transfer length factor: how many bytes to read from the last track */
2908         if (first_trk == last_trk)
2909                 tlf = last_offs - first_offs + 1;
2910         else
2911                 tlf = last_offs + 1;
2912         tlf *= blksize;
2913
2914         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
2915         if (IS_ERR(itcw)) {
2916                 ret = -EINVAL;
2917                 goto out_error;
2918         }
2919         cqr->cpaddr = itcw_get_tcw(itcw);
2920         if (prepare_itcw(itcw, first_trk, last_trk,
2921                          cmd, basedev, startdev,
2922                          first_offs + 1,
2923                          trkcount, blksize,
2924                          (last_rec - first_rec + 1) * blksize,
2925                          tlf, blk_per_trk) == -EAGAIN) {
2926                 /* Clock not in sync and XRC is enabled.
2927                  * Try again later.
2928                  */
2929                 ret = -EAGAIN;
2930                 goto out_error;
2931         }
2932         len_to_track_end = 0;
2933         /*
2934          * A tidaw can address 4k of memory, but must not cross page boundaries
2935          * We can let the block layer handle this by setting
2936          * blk_queue_segment_boundary to page boundaries and
2937          * blk_max_segment_size to page size when setting up the request queue.
2938          * For write requests, a TIDAW must not cross track boundaries, because
2939          * we have to set the CBC flag on the last tidaw for each track.
2940          */
2941         if (rq_data_dir(req) == WRITE) {
2942                 new_track = 1;
2943                 recid = first_rec;
2944                 rq_for_each_segment(bv, req, iter) {
2945                         dst = page_address(bv->bv_page) + bv->bv_offset;
2946                         seg_len = bv->bv_len;
2947                         while (seg_len) {
2948                                 if (new_track) {
2949                                         trkid = recid;
2950                                         offs = sector_div(trkid, blk_per_trk);
2951                                         count_to_trk_end = blk_per_trk - offs;
2952                                         count = min((last_rec - recid + 1),
2953                                                     (sector_t)count_to_trk_end);
2954                                         len_to_track_end = count * blksize;
2955                                         recid += count;
2956                                         new_track = 0;
2957                                 }
2958                                 part_len = min(seg_len, len_to_track_end);
2959                                 seg_len -= part_len;
2960                                 len_to_track_end -= part_len;
2961                                 /* We need to end the tidaw at track end */
2962                                 if (!len_to_track_end) {
2963                                         new_track = 1;
2964                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
2965                                 } else
2966                                         tidaw_flags = 0;
2967                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
2968                                                             dst, part_len);
2969                                 if (IS_ERR(last_tidaw)) {
2970                                         ret = -EINVAL;
2971                                         goto out_error;
2972                                 }
2973                                 dst += part_len;
2974                         }
2975                 }
2976         } else {
2977                 rq_for_each_segment(bv, req, iter) {
2978                         dst = page_address(bv->bv_page) + bv->bv_offset;
2979                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
2980                                                     dst, bv->bv_len);
2981                         if (IS_ERR(last_tidaw)) {
2982                                 ret = -EINVAL;
2983                                 goto out_error;
2984                         }
2985                 }
2986         }
2987         last_tidaw->flags |= TIDAW_FLAGS_LAST;
2988         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
2989         itcw_finalize(itcw);
2990
2991         if (blk_noretry_request(req) ||
2992             block->base->features & DASD_FEATURE_FAILFAST)
2993                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2994         cqr->cpmode = 1;
2995         cqr->startdev = startdev;
2996         cqr->memdev = startdev;
2997         cqr->block = block;
2998         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2999         cqr->lpm = startdev->path_data.ppm;
3000         cqr->retries = 256;
3001         cqr->buildclk = get_clock();
3002         cqr->status = DASD_CQR_FILLED;
3003         return cqr;
3004 out_error:
3005         dasd_sfree_request(cqr, startdev);
3006         return ERR_PTR(ret);
3007 }
3008
3009 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3010                                                struct dasd_block *block,
3011                                                struct request *req)
3012 {
3013         int cmdrtd, cmdwtd;
3014         int use_prefix;
3015         int fcx_multitrack;
3016         struct dasd_eckd_private *private;
3017         struct dasd_device *basedev;
3018         sector_t first_rec, last_rec;
3019         sector_t first_trk, last_trk;
3020         unsigned int first_offs, last_offs;
3021         unsigned int blk_per_trk, blksize;
3022         int cdlspecial;
3023         unsigned int data_size;
3024         struct dasd_ccw_req *cqr;
3025
3026         basedev = block->base;
3027         private = (struct dasd_eckd_private *) basedev->private;
3028
3029         /* Calculate number of blocks/records per track. */
3030         blksize = block->bp_block;
3031         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3032         if (blk_per_trk == 0)
3033                 return ERR_PTR(-EINVAL);
3034         /* Calculate record id of first and last block. */
3035         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3036         first_offs = sector_div(first_trk, blk_per_trk);
3037         last_rec = last_trk =
3038                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3039         last_offs = sector_div(last_trk, blk_per_trk);
3040         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3041
3042         fcx_multitrack = private->features.feature[40] & 0x20;
3043         data_size = blk_rq_bytes(req);
3044         /* tpm write request add CBC data on each track boundary */
3045         if (rq_data_dir(req) == WRITE)
3046                 data_size += (last_trk - first_trk) * 4;
3047
3048         /* is read track data and write track data in command mode supported? */
3049         cmdrtd = private->features.feature[9] & 0x20;
3050         cmdwtd = private->features.feature[12] & 0x40;
3051         use_prefix = private->features.feature[8] & 0x01;
3052
3053         cqr = NULL;
3054         if (cdlspecial || dasd_page_cache) {
3055                 /* do nothing, just fall through to the cmd mode single case */
3056         } else if ((data_size <= private->fcx_max_data)
3057                    && (fcx_multitrack || (first_trk == last_trk))) {
3058                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3059                                                     first_rec, last_rec,
3060                                                     first_trk, last_trk,
3061                                                     first_offs, last_offs,
3062                                                     blk_per_trk, blksize);
3063                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3064                     (PTR_ERR(cqr) != -ENOMEM))
3065                         cqr = NULL;
3066         } else if (use_prefix &&
3067                    (((rq_data_dir(req) == READ) && cmdrtd) ||
3068                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3069                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3070                                                    first_rec, last_rec,
3071                                                    first_trk, last_trk,
3072                                                    first_offs, last_offs,
3073                                                    blk_per_trk, blksize);
3074                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3075                     (PTR_ERR(cqr) != -ENOMEM))
3076                         cqr = NULL;
3077         }
3078         if (!cqr)
3079                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3080                                                     first_rec, last_rec,
3081                                                     first_trk, last_trk,
3082                                                     first_offs, last_offs,
3083                                                     blk_per_trk, blksize);
3084         return cqr;
3085 }
3086
3087 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
3088                                                struct dasd_block *block,
3089                                                struct request *req)
3090 {
3091         unsigned long *idaws;
3092         struct dasd_device *basedev;
3093         struct dasd_ccw_req *cqr;
3094         struct ccw1 *ccw;
3095         struct req_iterator iter;
3096         struct bio_vec *bv;
3097         char *dst;
3098         unsigned char cmd;
3099         unsigned int trkcount;
3100         unsigned int seg_len, len_to_track_end;
3101         unsigned int first_offs;
3102         unsigned int cidaw, cplength, datasize;
3103         sector_t first_trk, last_trk;
3104         unsigned int pfx_datasize;
3105
3106         /*
3107          * raw track access needs to be mutiple of 64k and on 64k boundary
3108          */
3109         if ((blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK) != 0) {
3110                 cqr = ERR_PTR(-EINVAL);
3111                 goto out;
3112         }
3113         if (((blk_rq_pos(req) + blk_rq_sectors(req)) %
3114              DASD_RAW_SECTORS_PER_TRACK) != 0) {
3115                 cqr = ERR_PTR(-EINVAL);
3116                 goto out;
3117         }
3118
3119         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3120         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3121                 DASD_RAW_SECTORS_PER_TRACK;
3122         trkcount = last_trk - first_trk + 1;
3123         first_offs = 0;
3124         basedev = block->base;
3125
3126         if (rq_data_dir(req) == READ)
3127                 cmd = DASD_ECKD_CCW_READ_TRACK;
3128         else if (rq_data_dir(req) == WRITE)
3129                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3130         else {
3131                 cqr = ERR_PTR(-EINVAL);
3132                 goto out;
3133         }
3134
3135         /*
3136          * Raw track based I/O needs IDAWs for each page,
3137          * and not just for 64 bit addresses.
3138          */
3139         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3140
3141         /* 1x prefix + one read/write ccw per track */
3142         cplength = 1 + trkcount;
3143
3144         /*
3145          * struct PFX_eckd_data has up to 2 byte as extended parameter
3146          * this is needed for write full track and has to be mentioned
3147          * separately
3148          * add 8 instead of 2 to keep 8 byte boundary
3149          */
3150         pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
3151
3152         datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
3153
3154         /* Allocate the ccw request. */
3155         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3156                                    datasize, startdev);
3157         if (IS_ERR(cqr))
3158                 goto out;
3159         ccw = cqr->cpaddr;
3160
3161         if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
3162                        basedev, startdev, 1 /* format */, first_offs + 1,
3163                        trkcount, 0, 0) == -EAGAIN) {
3164                 /* Clock not in sync and XRC is enabled.
3165                  * Try again later.
3166                  */
3167                 dasd_sfree_request(cqr, startdev);
3168                 cqr = ERR_PTR(-EAGAIN);
3169                 goto out;
3170         }
3171
3172         idaws = (unsigned long *)(cqr->data + pfx_datasize);
3173
3174         len_to_track_end = 0;
3175
3176         rq_for_each_segment(bv, req, iter) {
3177                 dst = page_address(bv->bv_page) + bv->bv_offset;
3178                 seg_len = bv->bv_len;
3179                 if (!len_to_track_end) {
3180                         ccw[-1].flags |= CCW_FLAG_CC;
3181                         ccw->cmd_code = cmd;
3182                         /* maximum 3390 track size */
3183                         ccw->count = 57326;
3184                         /* 64k map to one track */
3185                         len_to_track_end = 65536;
3186                         ccw->cda = (__u32)(addr_t)idaws;
3187                         ccw->flags |= CCW_FLAG_IDA;
3188                         ccw->flags |= CCW_FLAG_SLI;
3189                         ccw++;
3190                 }
3191                 len_to_track_end -= seg_len;
3192                 idaws = idal_create_words(idaws, dst, seg_len);
3193         }
3194
3195         if (blk_noretry_request(req) ||
3196             block->base->features & DASD_FEATURE_FAILFAST)
3197                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3198         cqr->startdev = startdev;
3199         cqr->memdev = startdev;
3200         cqr->block = block;
3201         cqr->expires = startdev->default_expires * HZ;
3202         cqr->lpm = startdev->path_data.ppm;
3203         cqr->retries = 256;
3204         cqr->buildclk = get_clock();
3205         cqr->status = DASD_CQR_FILLED;
3206
3207         if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
3208                 cqr = NULL;
3209 out:
3210         return cqr;
3211 }
3212
3213
3214 static int
3215 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3216 {
3217         struct dasd_eckd_private *private;
3218         struct ccw1 *ccw;
3219         struct req_iterator iter;
3220         struct bio_vec *bv;
3221         char *dst, *cda;
3222         unsigned int blksize, blk_per_trk, off;
3223         sector_t recid;
3224         int status;
3225
3226         if (!dasd_page_cache)
3227                 goto out;
3228         private = (struct dasd_eckd_private *) cqr->block->base->private;
3229         blksize = cqr->block->bp_block;
3230         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3231         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3232         ccw = cqr->cpaddr;
3233         /* Skip over define extent & locate record. */
3234         ccw++;
3235         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3236                 ccw++;
3237         rq_for_each_segment(bv, req, iter) {
3238                 dst = page_address(bv->bv_page) + bv->bv_offset;
3239                 for (off = 0; off < bv->bv_len; off += blksize) {
3240                         /* Skip locate record. */
3241                         if (private->uses_cdl && recid <= 2*blk_per_trk)
3242                                 ccw++;
3243                         if (dst) {
3244                                 if (ccw->flags & CCW_FLAG_IDA)
3245                                         cda = *((char **)((addr_t) ccw->cda));
3246                                 else
3247                                         cda = (char *)((addr_t) ccw->cda);
3248                                 if (dst != cda) {
3249                                         if (rq_data_dir(req) == READ)
3250                                                 memcpy(dst, cda, bv->bv_len);
3251                                         kmem_cache_free(dasd_page_cache,
3252                                             (void *)((addr_t)cda & PAGE_MASK));
3253                                 }
3254                                 dst = NULL;
3255                         }
3256                         ccw++;
3257                         recid++;
3258                 }
3259         }
3260 out:
3261         status = cqr->status == DASD_CQR_DONE;
3262         dasd_sfree_request(cqr, cqr->memdev);
3263         return status;
3264 }
3265
3266 /*
3267  * Modify ccw/tcw in cqr so it can be started on a base device.
3268  *
3269  * Note that this is not enough to restart the cqr!
3270  * Either reset cqr->startdev as well (summary unit check handling)
3271  * or restart via separate cqr (as in ERP handling).
3272  */
3273 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3274 {
3275         struct ccw1 *ccw;
3276         struct PFX_eckd_data *pfxdata;
3277         struct tcw *tcw;
3278         struct tccb *tccb;
3279         struct dcw *dcw;
3280
3281         if (cqr->cpmode == 1) {
3282                 tcw = cqr->cpaddr;
3283                 tccb = tcw_get_tccb(tcw);
3284                 dcw = (struct dcw *)&tccb->tca[0];
3285                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
3286                 pfxdata->validity.verify_base = 0;
3287                 pfxdata->validity.hyper_pav = 0;
3288         } else {
3289                 ccw = cqr->cpaddr;
3290                 pfxdata = cqr->data;
3291                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
3292                         pfxdata->validity.verify_base = 0;
3293                         pfxdata->validity.hyper_pav = 0;
3294                 }
3295         }
3296 }
3297
3298 #define DASD_ECKD_CHANQ_MAX_SIZE 4
3299
3300 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
3301                                                      struct dasd_block *block,
3302                                                      struct request *req)
3303 {
3304         struct dasd_eckd_private *private;
3305         struct dasd_device *startdev;
3306         unsigned long flags;
3307         struct dasd_ccw_req *cqr;
3308
3309         startdev = dasd_alias_get_start_dev(base);
3310         if (!startdev)
3311                 startdev = base;
3312         private = (struct dasd_eckd_private *) startdev->private;
3313         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
3314                 return ERR_PTR(-EBUSY);
3315
3316         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
3317         private->count++;
3318         if ((base->features & DASD_FEATURE_USERAW))
3319                 cqr = dasd_raw_build_cp(startdev, block, req);
3320         else
3321                 cqr = dasd_eckd_build_cp(startdev, block, req);
3322         if (IS_ERR(cqr))
3323                 private->count--;
3324         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
3325         return cqr;
3326 }
3327
3328 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
3329                                    struct request *req)
3330 {
3331         struct dasd_eckd_private *private;
3332         unsigned long flags;
3333
3334         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
3335         private = (struct dasd_eckd_private *) cqr->memdev->private;
3336         private->count--;
3337         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
3338         return dasd_eckd_free_cp(cqr, req);
3339 }
3340
3341 static int
3342 dasd_eckd_fill_info(struct dasd_device * device,
3343                     struct dasd_information2_t * info)
3344 {
3345         struct dasd_eckd_private *private;
3346
3347         private = (struct dasd_eckd_private *) device->private;
3348         info->label_block = 2;
3349         info->FBA_layout = private->uses_cdl ? 0 : 1;
3350         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
3351         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
3352         memcpy(info->characteristics, &private->rdc_data,
3353                sizeof(struct dasd_eckd_characteristics));
3354         info->confdata_size = min((unsigned long)private->conf_len,
3355                                   sizeof(info->configuration_data));
3356         memcpy(info->configuration_data, private->conf_data,
3357                info->confdata_size);
3358         return 0;
3359 }
3360
3361 /*
3362  * SECTION: ioctl functions for eckd devices.
3363  */
3364
3365 /*
3366  * Release device ioctl.
3367  * Buils a channel programm to releases a prior reserved
3368  * (see dasd_eckd_reserve) device.
3369  */
3370 static int
3371 dasd_eckd_release(struct dasd_device *device)
3372 {
3373         struct dasd_ccw_req *cqr;
3374         int rc;
3375         struct ccw1 *ccw;
3376         int useglobal;
3377
3378         if (!capable(CAP_SYS_ADMIN))
3379                 return -EACCES;
3380
3381         useglobal = 0;
3382         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3383         if (IS_ERR(cqr)) {
3384                 mutex_lock(&dasd_reserve_mutex);
3385                 useglobal = 1;
3386                 cqr = &dasd_reserve_req->cqr;
3387                 memset(cqr, 0, sizeof(*cqr));
3388                 memset(&dasd_reserve_req->ccw, 0,
3389                        sizeof(dasd_reserve_req->ccw));
3390                 cqr->cpaddr = &dasd_reserve_req->ccw;
3391                 cqr->data = &dasd_reserve_req->data;
3392                 cqr->magic = DASD_ECKD_MAGIC;
3393         }
3394         ccw = cqr->cpaddr;
3395         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
3396         ccw->flags |= CCW_FLAG_SLI;
3397         ccw->count = 32;
3398         ccw->cda = (__u32)(addr_t) cqr->data;
3399         cqr->startdev = device;
3400         cqr->memdev = device;
3401         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3402         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3403         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3404         cqr->expires = 2 * HZ;
3405         cqr->buildclk = get_clock();
3406         cqr->status = DASD_CQR_FILLED;
3407
3408         rc = dasd_sleep_on_immediatly(cqr);
3409         if (!rc)
3410                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3411
3412         if (useglobal)
3413                 mutex_unlock(&dasd_reserve_mutex);
3414         else
3415                 dasd_sfree_request(cqr, cqr->memdev);
3416         return rc;
3417 }
3418
3419 /*
3420  * Reserve device ioctl.
3421  * Options are set to 'synchronous wait for interrupt' and
3422  * 'timeout the request'. This leads to a terminate IO if
3423  * the interrupt is outstanding for a certain time.
3424  */
3425 static int
3426 dasd_eckd_reserve(struct dasd_device *device)
3427 {
3428         struct dasd_ccw_req *cqr;
3429         int rc;
3430         struct ccw1 *ccw;
3431         int useglobal;
3432
3433         if (!capable(CAP_SYS_ADMIN))
3434                 return -EACCES;
3435
3436         useglobal = 0;
3437         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3438         if (IS_ERR(cqr)) {
3439                 mutex_lock(&dasd_reserve_mutex);
3440                 useglobal = 1;
3441                 cqr = &dasd_reserve_req->cqr;
3442                 memset(cqr, 0, sizeof(*cqr));
3443                 memset(&dasd_reserve_req->ccw, 0,
3444                        sizeof(dasd_reserve_req->ccw));
3445                 cqr->cpaddr = &dasd_reserve_req->ccw;
3446                 cqr->data = &dasd_reserve_req->data;
3447                 cqr->magic = DASD_ECKD_MAGIC;
3448         }
3449         ccw = cqr->cpaddr;
3450         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
3451         ccw->flags |= CCW_FLAG_SLI;
3452         ccw->count = 32;
3453         ccw->cda = (__u32)(addr_t) cqr->data;
3454         cqr->startdev = device;
3455         cqr->memdev = device;
3456         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3457         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3458         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3459         cqr->expires = 2 * HZ;
3460         cqr->buildclk = get_clock();
3461         cqr->status = DASD_CQR_FILLED;
3462
3463         rc = dasd_sleep_on_immediatly(cqr);
3464         if (!rc)
3465                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3466
3467         if (useglobal)
3468                 mutex_unlock(&dasd_reserve_mutex);
3469         else
3470                 dasd_sfree_request(cqr, cqr->memdev);
3471         return rc;
3472 }
3473
3474 /*
3475  * Steal lock ioctl - unconditional reserve device.
3476  * Buils a channel programm to break a device's reservation.
3477  * (unconditional reserve)
3478  */
3479 static int
3480 dasd_eckd_steal_lock(struct dasd_device *device)
3481 {
3482         struct dasd_ccw_req *cqr;
3483         int rc;
3484         struct ccw1 *ccw;
3485         int useglobal;
3486
3487         if (!capable(CAP_SYS_ADMIN))
3488                 return -EACCES;
3489
3490         useglobal = 0;
3491         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3492         if (IS_ERR(cqr)) {
3493                 mutex_lock(&dasd_reserve_mutex);
3494                 useglobal = 1;
3495                 cqr = &dasd_reserve_req->cqr;
3496                 memset(cqr, 0, sizeof(*cqr));
3497                 memset(&dasd_reserve_req->ccw, 0,
3498                        sizeof(dasd_reserve_req->ccw));
3499                 cqr->cpaddr = &dasd_reserve_req->ccw;
3500                 cqr->data = &dasd_reserve_req->data;
3501                 cqr->magic = DASD_ECKD_MAGIC;
3502         }
3503         ccw = cqr->cpaddr;
3504         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
3505         ccw->flags |= CCW_FLAG_SLI;
3506         ccw->count = 32;
3507         ccw->cda = (__u32)(addr_t) cqr->data;
3508         cqr->startdev = device;
3509         cqr->memdev = device;
3510         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3511         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3512         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3513         cqr->expires = 2 * HZ;
3514         cqr->buildclk = get_clock();
3515         cqr->status = DASD_CQR_FILLED;
3516
3517         rc = dasd_sleep_on_immediatly(cqr);
3518         if (!rc)
3519                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3520
3521         if (useglobal)
3522                 mutex_unlock(&dasd_reserve_mutex);
3523         else
3524                 dasd_sfree_request(cqr, cqr->memdev);
3525         return rc;
3526 }
3527
3528 /*
3529  * SNID - Sense Path Group ID
3530  * This ioctl may be used in situations where I/O is stalled due to
3531  * a reserve, so if the normal dasd_smalloc_request fails, we use the
3532  * preallocated dasd_reserve_req.
3533  */
3534 static int dasd_eckd_snid(struct dasd_device *device,
3535                           void __user *argp)
3536 {
3537         struct dasd_ccw_req *cqr;
3538         int rc;
3539         struct ccw1 *ccw;
3540         int useglobal;
3541         struct dasd_snid_ioctl_data usrparm;
3542
3543         if (!capable(CAP_SYS_ADMIN))
3544                 return -EACCES;
3545
3546         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3547                 return -EFAULT;
3548
3549         useglobal = 0;
3550         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
3551                                    sizeof(struct dasd_snid_data), device);
3552         if (IS_ERR(cqr)) {
3553                 mutex_lock(&dasd_reserve_mutex);
3554                 useglobal = 1;
3555                 cqr = &dasd_reserve_req->cqr;
3556                 memset(cqr, 0, sizeof(*cqr));
3557                 memset(&dasd_reserve_req->ccw, 0,
3558                        sizeof(dasd_reserve_req->ccw));
3559                 cqr->cpaddr = &dasd_reserve_req->ccw;
3560                 cqr->data = &dasd_reserve_req->data;
3561                 cqr->magic = DASD_ECKD_MAGIC;
3562         }
3563         ccw = cqr->cpaddr;
3564         ccw->cmd_code = DASD_ECKD_CCW_SNID;
3565         ccw->flags |= CCW_FLAG_SLI;
3566         ccw->count = 12;
3567         ccw->cda = (__u32)(addr_t) cqr->data;
3568         cqr->startdev = device;
3569         cqr->memdev = device;
3570         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3571         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3572         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
3573         cqr->retries = 5;
3574         cqr->expires = 10 * HZ;
3575         cqr->buildclk = get_clock();
3576         cqr->status = DASD_CQR_FILLED;
3577         cqr->lpm = usrparm.path_mask;
3578
3579         rc = dasd_sleep_on_immediatly(cqr);
3580         /* verify that I/O processing didn't modify the path mask */
3581         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
3582                 rc = -EIO;
3583         if (!rc) {
3584                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
3585                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
3586                         rc = -EFAULT;
3587         }
3588
3589         if (useglobal)
3590                 mutex_unlock(&dasd_reserve_mutex);
3591         else
3592                 dasd_sfree_request(cqr, cqr->memdev);
3593         return rc;
3594 }
3595
3596 /*
3597  * Read performance statistics
3598  */
3599 static int
3600 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
3601 {
3602         struct dasd_psf_prssd_data *prssdp;
3603         struct dasd_rssd_perf_stats_t *stats;
3604         struct dasd_ccw_req *cqr;
3605         struct ccw1 *ccw;
3606         int rc;
3607
3608         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
3609                                    (sizeof(struct dasd_psf_prssd_data) +
3610                                     sizeof(struct dasd_rssd_perf_stats_t)),
3611                                    device);
3612         if (IS_ERR(cqr)) {
3613                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3614                             "Could not allocate initialization request");
3615                 return PTR_ERR(cqr);
3616         }
3617         cqr->startdev = device;
3618         cqr->memdev = device;
3619         cqr->retries = 0;
3620         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3621         cqr->expires = 10 * HZ;
3622
3623         /* Prepare for Read Subsystem Data */
3624         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3625         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
3626         prssdp->order = PSF_ORDER_PRSSD;
3627         prssdp->suborder = 0x01;        /* Performance Statistics */
3628         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
3629
3630         ccw = cqr->cpaddr;
3631         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3632         ccw->count = sizeof(struct dasd_psf_prssd_data);
3633         ccw->flags |= CCW_FLAG_CC;
3634         ccw->cda = (__u32)(addr_t) prssdp;
3635
3636         /* Read Subsystem Data - Performance Statistics */
3637         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3638         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
3639
3640         ccw++;
3641         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3642         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
3643         ccw->cda = (__u32)(addr_t) stats;
3644
3645         cqr->buildclk = get_clock();
3646         cqr->status = DASD_CQR_FILLED;
3647         rc = dasd_sleep_on(cqr);
3648         if (rc == 0) {
3649                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3650                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3651                 if (copy_to_user(argp, stats,
3652                                  sizeof(struct dasd_rssd_perf_stats_t)))
3653                         rc = -EFAULT;
3654         }
3655         dasd_sfree_request(cqr, cqr->memdev);
3656         return rc;
3657 }
3658
3659 /*
3660  * Get attributes (cache operations)
3661  * Returnes the cache attributes used in Define Extend (DE).
3662  */
3663 static int
3664 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
3665 {
3666         struct dasd_eckd_private *private =
3667                 (struct dasd_eckd_private *)device->private;
3668         struct attrib_data_t attrib = private->attrib;
3669         int rc;
3670
3671         if (!capable(CAP_SYS_ADMIN))
3672                 return -EACCES;
3673         if (!argp)
3674                 return -EINVAL;
3675
3676         rc = 0;
3677         if (copy_to_user(argp, (long *) &attrib,
3678                          sizeof(struct attrib_data_t)))
3679                 rc = -EFAULT;
3680
3681         return rc;
3682 }
3683
3684 /*
3685  * Set attributes (cache operations)
3686  * Stores the attributes for cache operation to be used in Define Extend (DE).
3687  */
3688 static int
3689 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
3690 {
3691         struct dasd_eckd_private *private =
3692                 (struct dasd_eckd_private *)device->private;
3693         struct attrib_data_t attrib;
3694
3695         if (!capable(CAP_SYS_ADMIN))
3696                 return -EACCES;
3697         if (!argp)
3698                 return -EINVAL;
3699
3700         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
3701                 return -EFAULT;
3702         private->attrib = attrib;
3703
3704         dev_info(&device->cdev->dev,
3705                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
3706                  private->attrib.operation, private->attrib.nr_cyl);
3707         return 0;
3708 }
3709
3710 /*
3711  * Issue syscall I/O to EMC Symmetrix array.
3712  * CCWs are PSF and RSSD
3713  */
3714 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
3715 {
3716         struct dasd_symmio_parms usrparm;
3717         char *psf_data, *rssd_result;
3718         struct dasd_ccw_req *cqr;
3719         struct ccw1 *ccw;
3720         char psf0, psf1;
3721         int rc;
3722
3723         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
3724                 return -EACCES;
3725         psf0 = psf1 = 0;
3726
3727         /* Copy parms from caller */
3728         rc = -EFAULT;
3729         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3730                 goto out;
3731         if (is_compat_task() || sizeof(long) == 4) {
3732                 /* Make sure pointers are sane even on 31 bit. */
3733                 rc = -EINVAL;
3734                 if ((usrparm.psf_data >> 32) != 0)
3735                         goto out;
3736                 if ((usrparm.rssd_result >> 32) != 0)
3737                         goto out;
3738                 usrparm.psf_data &= 0x7fffffffULL;
3739                 usrparm.rssd_result &= 0x7fffffffULL;
3740         }
3741         /* alloc I/O data area */
3742         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
3743         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
3744         if (!psf_data || !rssd_result) {
3745                 rc = -ENOMEM;
3746                 goto out_free;
3747         }
3748
3749         /* get syscall header from user space */
3750         rc = -EFAULT;
3751         if (copy_from_user(psf_data,
3752                            (void __user *)(unsigned long) usrparm.psf_data,
3753                            usrparm.psf_data_len))
3754                 goto out_free;
3755         psf0 = psf_data[0];
3756         psf1 = psf_data[1];
3757
3758         /* setup CCWs for PSF + RSSD */
3759         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
3760         if (IS_ERR(cqr)) {
3761                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3762                         "Could not allocate initialization request");
3763                 rc = PTR_ERR(cqr);
3764                 goto out_free;
3765         }
3766
3767         cqr->startdev = device;
3768         cqr->memdev = device;
3769         cqr->retries = 3;
3770         cqr->expires = 10 * HZ;
3771         cqr->buildclk = get_clock();
3772         cqr->status = DASD_CQR_FILLED;
3773
3774         /* Build the ccws */
3775         ccw = cqr->cpaddr;
3776
3777         /* PSF ccw */
3778         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3779         ccw->count = usrparm.psf_data_len;
3780         ccw->flags |= CCW_FLAG_CC;
3781         ccw->cda = (__u32)(addr_t) psf_data;
3782
3783         ccw++;
3784
3785         /* RSSD ccw  */
3786         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3787         ccw->count = usrparm.rssd_result_len;
3788         ccw->flags = CCW_FLAG_SLI ;
3789         ccw->cda = (__u32)(addr_t) rssd_result;
3790
3791         rc = dasd_sleep_on(cqr);
3792         if (rc)
3793                 goto out_sfree;
3794
3795         rc = -EFAULT;
3796         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
3797                            rssd_result, usrparm.rssd_result_len))
3798                 goto out_sfree;
3799         rc = 0;
3800
3801 out_sfree:
3802         dasd_sfree_request(cqr, cqr->memdev);
3803 out_free:
3804         kfree(rssd_result);
3805         kfree(psf_data);
3806 out:
3807         DBF_DEV_EVENT(DBF_WARNING, device,
3808                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
3809                       (int) psf0, (int) psf1, rc);
3810         return rc;
3811 }
3812
3813 static int
3814 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
3815 {
3816         struct dasd_device *device = block->base;
3817
3818         switch (cmd) {
3819         case BIODASDGATTR:
3820                 return dasd_eckd_get_attrib(device, argp);
3821         case BIODASDSATTR:
3822                 return dasd_eckd_set_attrib(device, argp);
3823         case BIODASDPSRD:
3824                 return dasd_eckd_performance(device, argp);
3825         case BIODASDRLSE:
3826                 return dasd_eckd_release(device);
3827         case BIODASDRSRV:
3828                 return dasd_eckd_reserve(device);
3829         case BIODASDSLCK:
3830                 return dasd_eckd_steal_lock(device);
3831         case BIODASDSNID:
3832                 return dasd_eckd_snid(device, argp);
3833         case BIODASDSYMMIO:
3834                 return dasd_symm_io(device, argp);
3835         default:
3836                 return -ENOTTY;
3837         }
3838 }
3839
3840 /*
3841  * Dump the range of CCWs into 'page' buffer
3842  * and return number of printed chars.
3843  */
3844 static int
3845 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
3846 {
3847         int len, count;
3848         char *datap;
3849
3850         len = 0;
3851         while (from <= to) {
3852                 len += sprintf(page + len, PRINTK_HEADER
3853                                " CCW %p: %08X %08X DAT:",
3854                                from, ((int *) from)[0], ((int *) from)[1]);
3855
3856                 /* get pointer to data (consider IDALs) */
3857                 if (from->flags & CCW_FLAG_IDA)
3858                         datap = (char *) *((addr_t *) (addr_t) from->cda);
3859                 else
3860                         datap = (char *) ((addr_t) from->cda);
3861
3862                 /* dump data (max 32 bytes) */
3863                 for (count = 0; count < from->count && count < 32; count++) {
3864                         if (count % 8 == 0) len += sprintf(page + len, " ");
3865                         if (count % 4 == 0) len += sprintf(page + len, " ");
3866                         len += sprintf(page + len, "%02x", datap[count]);
3867                 }
3868                 len += sprintf(page + len, "\n");
3869                 from++;
3870         }
3871         return len;
3872 }
3873
3874 static void
3875 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
3876                          char *reason)
3877 {
3878         u64 *sense;
3879         u64 *stat;
3880
3881         sense = (u64 *) dasd_get_sense(irb);
3882         stat = (u64 *) &irb->scsw;
3883         if (sense) {
3884                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
3885                               "%016llx %016llx %016llx %016llx",
3886                               reason, *stat, *((u32 *) (stat + 1)),
3887                               sense[0], sense[1], sense[2], sense[3]);
3888         } else {
3889                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
3890                               reason, *stat, *((u32 *) (stat + 1)),
3891                               "NO VALID SENSE");
3892         }
3893 }
3894
3895 /*
3896  * Print sense data and related channel program.
3897  * Parts are printed because printk buffer is only 1024 bytes.
3898  */
3899 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
3900                                  struct dasd_ccw_req *req, struct irb *irb)
3901 {
3902         char *page;
3903         struct ccw1 *first, *last, *fail, *from, *to;
3904         int len, sl, sct;
3905
3906         page = (char *) get_zeroed_page(GFP_ATOMIC);
3907         if (page == NULL) {
3908                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3909                               "No memory to dump sense data\n");
3910                 return;
3911         }
3912         /* dump the sense data */
3913         len = sprintf(page, PRINTK_HEADER
3914                       " I/O status report for device %s:\n",
3915                       dev_name(&device->cdev->dev));
3916         len += sprintf(page + len, PRINTK_HEADER
3917                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
3918                        "CS:%02X RC:%d\n",
3919                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
3920                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
3921                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
3922                        req ? req->intrc : 0);
3923         len += sprintf(page + len, PRINTK_HEADER
3924                        " device %s: Failing CCW: %p\n",
3925                        dev_name(&device->cdev->dev),
3926                        (void *) (addr_t) irb->scsw.cmd.cpa);
3927         if (irb->esw.esw0.erw.cons) {
3928                 for (sl = 0; sl < 4; sl++) {
3929                         len += sprintf(page + len, PRINTK_HEADER
3930                                        " Sense(hex) %2d-%2d:",
3931                                        (8 * sl), ((8 * sl) + 7));
3932
3933                         for (sct = 0; sct < 8; sct++) {
3934                                 len += sprintf(page + len, " %02x",
3935                                                irb->ecw[8 * sl + sct]);
3936                         }
3937                         len += sprintf(page + len, "\n");
3938                 }
3939
3940                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
3941                         /* 24 Byte Sense Data */
3942                         sprintf(page + len, PRINTK_HEADER
3943                                 " 24 Byte: %x MSG %x, "
3944                                 "%s MSGb to SYSOP\n",
3945                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
3946                                 irb->ecw[1] & 0x10 ? "" : "no");
3947                 } else {
3948                         /* 32 Byte Sense Data */
3949                         sprintf(page + len, PRINTK_HEADER
3950                                 " 32 Byte: Format: %x "
3951                                 "Exception class %x\n",
3952                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
3953                 }
3954         } else {
3955                 sprintf(page + len, PRINTK_HEADER
3956                         " SORRY - NO VALID SENSE AVAILABLE\n");
3957         }
3958         printk(KERN_ERR "%s", page);
3959
3960         if (req) {
3961                 /* req == NULL for unsolicited interrupts */
3962                 /* dump the Channel Program (max 140 Bytes per line) */
3963                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
3964                 first = req->cpaddr;
3965                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
3966                 to = min(first + 6, last);
3967                 len = sprintf(page, PRINTK_HEADER
3968                               " Related CP in req: %p\n", req);
3969                 dasd_eckd_dump_ccw_range(first, to, page + len);
3970                 printk(KERN_ERR "%s", page);
3971
3972                 /* print failing CCW area (maximum 4) */
3973                 /* scsw->cda is either valid or zero  */
3974                 len = 0;
3975                 from = ++to;
3976                 fail = (struct ccw1 *)(addr_t)
3977                                 irb->scsw.cmd.cpa; /* failing CCW */
3978                 if (from <  fail - 2) {
3979                         from = fail - 2;     /* there is a gap - print header */
3980                         len += sprintf(page, PRINTK_HEADER "......\n");
3981                 }
3982                 to = min(fail + 1, last);
3983                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
3984
3985                 /* print last CCWs (maximum 2) */
3986                 from = max(from, ++to);
3987                 if (from < last - 1) {
3988                         from = last - 1;     /* there is a gap - print header */
3989                         len += sprintf(page + len, PRINTK_HEADER "......\n");
3990                 }
3991                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
3992                 if (len > 0)
3993                         printk(KERN_ERR "%s", page);
3994         }
3995         free_page((unsigned long) page);
3996 }
3997
3998
3999 /*
4000  * Print sense data from a tcw.
4001  */
4002 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4003                                  struct dasd_ccw_req *req, struct irb *irb)
4004 {
4005         char *page;
4006         int len, sl, sct, residual;
4007         struct tsb *tsb;
4008         u8 *sense, *rcq;
4009
4010         page = (char *) get_zeroed_page(GFP_ATOMIC);
4011         if (page == NULL) {
4012                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4013                             "No memory to dump sense data");
4014                 return;
4015         }
4016         /* dump the sense data */
4017         len = sprintf(page, PRINTK_HEADER
4018                       " I/O status report for device %s:\n",
4019                       dev_name(&device->cdev->dev));
4020         len += sprintf(page + len, PRINTK_HEADER
4021                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4022                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4023                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4024                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4025                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4026                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
4027                        req ? req->intrc : 0);
4028         len += sprintf(page + len, PRINTK_HEADER
4029                        " device %s: Failing TCW: %p\n",
4030                        dev_name(&device->cdev->dev),
4031                        (void *) (addr_t) irb->scsw.tm.tcw);
4032
4033         tsb = NULL;
4034         sense = NULL;
4035         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4036                 tsb = tcw_get_tsb(
4037                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4038
4039         if (tsb) {
4040                 len += sprintf(page + len, PRINTK_HEADER
4041                                " tsb->length %d\n", tsb->length);
4042                 len += sprintf(page + len, PRINTK_HEADER
4043                                " tsb->flags %x\n", tsb->flags);
4044                 len += sprintf(page + len, PRINTK_HEADER
4045                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
4046                 len += sprintf(page + len, PRINTK_HEADER
4047                                " tsb->count %d\n", tsb->count);
4048                 residual = tsb->count - 28;
4049                 len += sprintf(page + len, PRINTK_HEADER
4050                                " residual %d\n", residual);
4051
4052                 switch (tsb->flags & 0x07) {
4053                 case 1: /* tsa_iostat */
4054                         len += sprintf(page + len, PRINTK_HEADER
4055                                " tsb->tsa.iostat.dev_time %d\n",
4056                                        tsb->tsa.iostat.dev_time);
4057                         len += sprintf(page + len, PRINTK_HEADER
4058                                " tsb->tsa.iostat.def_time %d\n",
4059                                        tsb->tsa.iostat.def_time);
4060                         len += sprintf(page + len, PRINTK_HEADER
4061                                " tsb->tsa.iostat.queue_time %d\n",
4062                                        tsb->tsa.iostat.queue_time);
4063                         len += sprintf(page + len, PRINTK_HEADER
4064                                " tsb->tsa.iostat.dev_busy_time %d\n",
4065                                        tsb->tsa.iostat.dev_busy_time);
4066                         len += sprintf(page + len, PRINTK_HEADER
4067                                " tsb->tsa.iostat.dev_act_time %d\n",
4068                                        tsb->tsa.iostat.dev_act_time);
4069                         sense = tsb->tsa.iostat.sense;
4070                         break;
4071                 case 2: /* ts_ddpc */
4072                         len += sprintf(page + len, PRINTK_HEADER
4073                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4074                         for (sl = 0; sl < 2; sl++) {
4075                                 len += sprintf(page + len, PRINTK_HEADER
4076                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
4077                                                (8 * sl), ((8 * sl) + 7));
4078                                 rcq = tsb->tsa.ddpc.rcq;
4079                                 for (sct = 0; sct < 8; sct++) {
4080                                         len += sprintf(page + len, " %02x",
4081                                                        rcq[8 * sl + sct]);
4082                                 }
4083                                 len += sprintf(page + len, "\n");
4084                         }
4085                         sense = tsb->tsa.ddpc.sense;
4086                         break;
4087                 case 3: /* tsa_intrg */
4088                         len += sprintf(page + len, PRINTK_HEADER
4089                                       " tsb->tsa.intrg.: not supportet yet\n");
4090                         break;
4091                 }
4092
4093                 if (sense) {
4094                         for (sl = 0; sl < 4; sl++) {
4095                                 len += sprintf(page + len, PRINTK_HEADER
4096                                                " Sense(hex) %2d-%2d:",
4097                                                (8 * sl), ((8 * sl) + 7));
4098                                 for (sct = 0; sct < 8; sct++) {
4099                                         len += sprintf(page + len, " %02x",
4100                                                        sense[8 * sl + sct]);
4101                                 }
4102                                 len += sprintf(page + len, "\n");
4103                         }
4104
4105                         if (sense[27] & DASD_SENSE_BIT_0) {
4106                                 /* 24 Byte Sense Data */
4107                                 sprintf(page + len, PRINTK_HEADER
4108                                         " 24 Byte: %x MSG %x, "
4109                                         "%s MSGb to SYSOP\n",
4110                                         sense[7] >> 4, sense[7] & 0x0f,
4111                                         sense[1] & 0x10 ? "" : "no");
4112                         } else {
4113                                 /* 32 Byte Sense Data */
4114                                 sprintf(page + len, PRINTK_HEADER
4115                                         " 32 Byte: Format: %x "
4116                                         "Exception class %x\n",
4117                                         sense[6] & 0x0f, sense[22] >> 4);
4118                         }
4119                 } else {
4120                         sprintf(page + len, PRINTK_HEADER
4121                                 " SORRY - NO VALID SENSE AVAILABLE\n");
4122                 }
4123         } else {
4124                 sprintf(page + len, PRINTK_HEADER
4125                         " SORRY - NO TSB DATA AVAILABLE\n");
4126         }
4127         printk(KERN_ERR "%s", page);
4128         free_page((unsigned long) page);
4129 }
4130
4131 static void dasd_eckd_dump_sense(struct dasd_device *device,
4132                                  struct dasd_ccw_req *req, struct irb *irb)
4133 {
4134         if (scsw_is_tm(&irb->scsw))
4135                 dasd_eckd_dump_sense_tcw(device, req, irb);
4136         else
4137                 dasd_eckd_dump_sense_ccw(device, req, irb);
4138 }
4139
4140 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4141 {
4142         /*
4143          * the device should be disconnected from our LCU structure
4144          * on restore we will reconnect it and reread LCU specific
4145          * information like PAV support that might have changed
4146          */
4147         dasd_alias_remove_device(device);
4148         dasd_alias_disconnect_device_from_lcu(device);
4149
4150         return 0;
4151 }
4152
4153 static int dasd_eckd_restore_device(struct dasd_device *device)
4154 {
4155         struct dasd_eckd_private *private;
4156         struct dasd_eckd_characteristics temp_rdc_data;
4157         int rc;
4158         struct dasd_uid temp_uid;
4159         unsigned long flags;
4160
4161         private = (struct dasd_eckd_private *) device->private;
4162
4163         /* Read Configuration Data */
4164         dasd_eckd_read_conf(device);
4165
4166         dasd_eckd_get_uid(device, &temp_uid);
4167         /* Generate device unique id */
4168         rc = dasd_eckd_generate_uid(device);
4169         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4170         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4171                 dev_err(&device->cdev->dev, "The UID of the DASD has "
4172                         "changed\n");
4173         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4174         if (rc)
4175                 goto out_err;
4176
4177         /* register lcu with alias handling, enable PAV if this is a new lcu */
4178         rc = dasd_alias_make_device_known_to_lcu(device);
4179         if (rc)
4180                 return rc;
4181         dasd_eckd_validate_server(device, DASD_CQR_FLAGS_FAILFAST);
4182
4183         /* RE-Read Configuration Data */
4184         dasd_eckd_read_conf(device);
4185
4186         /* Read Feature Codes */
4187         dasd_eckd_read_features(device);
4188
4189         /* Read Device Characteristics */
4190         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4191                                          &temp_rdc_data, 64);
4192         if (rc) {
4193                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4194                                 "Read device characteristic failed, rc=%d", rc);
4195                 goto out_err;
4196         }
4197         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4198         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4199         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4200
4201         /* add device to alias management */
4202         dasd_alias_add_device(device);
4203
4204         return 0;
4205
4206 out_err:
4207         return -1;
4208 }
4209
4210 static int dasd_eckd_reload_device(struct dasd_device *device)
4211 {
4212         struct dasd_eckd_private *private;
4213         int rc, old_base;
4214         char print_uid[60];
4215         struct dasd_uid uid;
4216         unsigned long flags;
4217
4218         private = (struct dasd_eckd_private *) device->private;
4219
4220         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4221         old_base = private->uid.base_unit_addr;
4222         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4223
4224         /* Read Configuration Data */
4225         rc = dasd_eckd_read_conf(device);
4226         if (rc)
4227                 goto out_err;
4228
4229         rc = dasd_eckd_generate_uid(device);
4230         if (rc)
4231                 goto out_err;
4232         /*
4233          * update unit address configuration and
4234          * add device to alias management
4235          */
4236         dasd_alias_update_add_device(device);
4237
4238         dasd_eckd_get_uid(device, &uid);
4239
4240         if (old_base != uid.base_unit_addr) {
4241                 if (strlen(uid.vduit) > 0)
4242                         snprintf(print_uid, sizeof(print_uid),
4243                                  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
4244                                  uid.ssid, uid.base_unit_addr, uid.vduit);
4245                 else
4246                         snprintf(print_uid, sizeof(print_uid),
4247                                  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
4248                                  uid.ssid, uid.base_unit_addr);
4249
4250                 dev_info(&device->cdev->dev,
4251                          "An Alias device was reassigned to a new base device "
4252                          "with UID: %s\n", print_uid);
4253         }
4254         return 0;
4255
4256 out_err:
4257         return -1;
4258 }
4259
4260 static struct ccw_driver dasd_eckd_driver = {
4261         .driver = {
4262                 .name   = "dasd-eckd",
4263                 .owner  = THIS_MODULE,
4264         },
4265         .ids         = dasd_eckd_ids,
4266         .probe       = dasd_eckd_probe,
4267         .remove      = dasd_generic_remove,
4268         .set_offline = dasd_generic_set_offline,
4269         .set_online  = dasd_eckd_set_online,
4270         .notify      = dasd_generic_notify,
4271         .path_event  = dasd_generic_path_event,
4272         .shutdown    = dasd_generic_shutdown,
4273         .freeze      = dasd_generic_pm_freeze,
4274         .thaw        = dasd_generic_restore_device,
4275         .restore     = dasd_generic_restore_device,
4276         .uc_handler  = dasd_generic_uc_handler,
4277         .int_class   = IRQIO_DAS,
4278 };
4279
4280 /*
4281  * max_blocks is dependent on the amount of storage that is available
4282  * in the static io buffer for each device. Currently each device has
4283  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
4284  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
4285  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
4286  * addition we have one define extent ccw + 16 bytes of data and one
4287  * locate record ccw + 16 bytes of data. That makes:
4288  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
4289  * We want to fit two into the available memory so that we can immediately
4290  * start the next request if one finishes off. That makes 249.5 blocks
4291  * for one request. Give a little safety and the result is 240.
4292  */
4293 static struct dasd_discipline dasd_eckd_discipline = {
4294         .owner = THIS_MODULE,
4295         .name = "ECKD",
4296         .ebcname = "ECKD",
4297         .max_blocks = 190,
4298         .check_device = dasd_eckd_check_characteristics,
4299         .uncheck_device = dasd_eckd_uncheck_device,
4300         .do_analysis = dasd_eckd_do_analysis,
4301         .verify_path = dasd_eckd_verify_path,
4302         .ready_to_online = dasd_eckd_ready_to_online,
4303         .online_to_ready = dasd_eckd_online_to_ready,
4304         .fill_geometry = dasd_eckd_fill_geometry,
4305         .start_IO = dasd_start_IO,
4306         .term_IO = dasd_term_IO,
4307         .handle_terminated_request = dasd_eckd_handle_terminated_request,
4308         .format_device = dasd_eckd_format_device,
4309         .erp_action = dasd_eckd_erp_action,
4310         .erp_postaction = dasd_eckd_erp_postaction,
4311         .check_for_device_change = dasd_eckd_check_for_device_change,
4312         .build_cp = dasd_eckd_build_alias_cp,
4313         .free_cp = dasd_eckd_free_alias_cp,
4314         .dump_sense = dasd_eckd_dump_sense,
4315         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
4316         .fill_info = dasd_eckd_fill_info,
4317         .ioctl = dasd_eckd_ioctl,
4318         .freeze = dasd_eckd_pm_freeze,
4319         .restore = dasd_eckd_restore_device,
4320         .reload = dasd_eckd_reload_device,
4321         .get_uid = dasd_eckd_get_uid,
4322         .kick_validate = dasd_eckd_kick_validate_server,
4323 };
4324
4325 static int __init
4326 dasd_eckd_init(void)
4327 {
4328         int ret;
4329
4330         ASCEBC(dasd_eckd_discipline.ebcname, 4);
4331         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
4332                                    GFP_KERNEL | GFP_DMA);
4333         if (!dasd_reserve_req)
4334                 return -ENOMEM;
4335         path_verification_worker = kmalloc(sizeof(*path_verification_worker),
4336                                    GFP_KERNEL | GFP_DMA);
4337         if (!path_verification_worker) {
4338                 kfree(dasd_reserve_req);
4339                 return -ENOMEM;
4340         }
4341         ret = ccw_driver_register(&dasd_eckd_driver);
4342         if (!ret)
4343                 wait_for_device_probe();
4344         else {
4345                 kfree(path_verification_worker);
4346                 kfree(dasd_reserve_req);
4347         }
4348         return ret;
4349 }
4350
4351 static void __exit
4352 dasd_eckd_cleanup(void)
4353 {
4354         ccw_driver_unregister(&dasd_eckd_driver);
4355         kfree(path_verification_worker);
4356         kfree(dasd_reserve_req);
4357 }
4358
4359 module_init(dasd_eckd_init);
4360 module_exit(dasd_eckd_cleanup);