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_tod_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_tod_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_tod_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         unsigned long flags = 0;
1577
1578         set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1579         if (dasd_eckd_validate_server(device, flags)
1580             == -EAGAIN) {
1581                 /* schedule worker again if failed */
1582                 schedule_work(&device->kick_validate);
1583                 return;
1584         }
1585
1586         dasd_put_device(device);
1587 }
1588
1589 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1590 {
1591         dasd_get_device(device);
1592         /* exit if device not online or in offline processing */
1593         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1594            device->state < DASD_STATE_ONLINE) {
1595                 dasd_put_device(device);
1596                 return;
1597         }
1598         /* queue call to do_validate_server to the kernel event daemon. */
1599         schedule_work(&device->kick_validate);
1600 }
1601
1602 static u32 get_fcx_max_data(struct dasd_device *device)
1603 {
1604 #if defined(CONFIG_64BIT)
1605         int tpm, mdc;
1606         int fcx_in_css, fcx_in_gneq, fcx_in_features;
1607         struct dasd_eckd_private *private;
1608
1609         if (dasd_nofcx)
1610                 return 0;
1611         /* is transport mode supported? */
1612         private = (struct dasd_eckd_private *) device->private;
1613         fcx_in_css = css_general_characteristics.fcx;
1614         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1615         fcx_in_features = private->features.feature[40] & 0x80;
1616         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1617
1618         if (!tpm)
1619                 return 0;
1620
1621         mdc = ccw_device_get_mdc(device->cdev, 0);
1622         if (mdc < 0) {
1623                 dev_warn(&device->cdev->dev, "Detecting the maximum supported"
1624                          " data size for zHPF requests failed\n");
1625                 return 0;
1626         } else
1627                 return mdc * FCX_MAX_DATA_FACTOR;
1628 #else
1629         return 0;
1630 #endif
1631 }
1632
1633 /*
1634  * Check device characteristics.
1635  * If the device is accessible using ECKD discipline, the device is enabled.
1636  */
1637 static int
1638 dasd_eckd_check_characteristics(struct dasd_device *device)
1639 {
1640         struct dasd_eckd_private *private;
1641         struct dasd_block *block;
1642         struct dasd_uid temp_uid;
1643         int rc, i;
1644         int readonly;
1645         unsigned long value;
1646
1647         /* setup work queue for validate server*/
1648         INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1649
1650         if (!ccw_device_is_pathgroup(device->cdev)) {
1651                 dev_warn(&device->cdev->dev,
1652                          "A channel path group could not be established\n");
1653                 return -EIO;
1654         }
1655         if (!ccw_device_is_multipath(device->cdev)) {
1656                 dev_info(&device->cdev->dev,
1657                          "The DASD is not operating in multipath mode\n");
1658         }
1659         private = (struct dasd_eckd_private *) device->private;
1660         if (!private) {
1661                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1662                 if (!private) {
1663                         dev_warn(&device->cdev->dev,
1664                                  "Allocating memory for private DASD data "
1665                                  "failed\n");
1666                         return -ENOMEM;
1667                 }
1668                 device->private = (void *) private;
1669         } else {
1670                 memset(private, 0, sizeof(*private));
1671         }
1672         /* Invalidate status of initial analysis. */
1673         private->init_cqr_status = -1;
1674         /* Set default cache operations. */
1675         private->attrib.operation = DASD_NORMAL_CACHE;
1676         private->attrib.nr_cyl = 0;
1677
1678         /* Read Configuration Data */
1679         rc = dasd_eckd_read_conf(device);
1680         if (rc)
1681                 goto out_err1;
1682
1683         /* set default timeout */
1684         device->default_expires = DASD_EXPIRES;
1685         if (private->gneq) {
1686                 value = 1;
1687                 for (i = 0; i < private->gneq->timeout.value; i++)
1688                         value = 10 * value;
1689                 value = value * private->gneq->timeout.number;
1690                 /* do not accept useless values */
1691                 if (value != 0 && value <= DASD_EXPIRES_MAX)
1692                         device->default_expires = value;
1693         }
1694
1695         dasd_eckd_get_uid(device, &temp_uid);
1696         if (temp_uid.type == UA_BASE_DEVICE) {
1697                 block = dasd_alloc_block();
1698                 if (IS_ERR(block)) {
1699                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1700                                         "could not allocate dasd "
1701                                         "block structure");
1702                         rc = PTR_ERR(block);
1703                         goto out_err1;
1704                 }
1705                 device->block = block;
1706                 block->base = device;
1707         }
1708
1709         /* register lcu with alias handling, enable PAV */
1710         rc = dasd_alias_make_device_known_to_lcu(device);
1711         if (rc)
1712                 goto out_err2;
1713
1714         dasd_eckd_validate_server(device, 0);
1715
1716         /* device may report different configuration data after LCU setup */
1717         rc = dasd_eckd_read_conf(device);
1718         if (rc)
1719                 goto out_err3;
1720
1721         /* Read Feature Codes */
1722         dasd_eckd_read_features(device);
1723
1724         /* Read Device Characteristics */
1725         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1726                                          &private->rdc_data, 64);
1727         if (rc) {
1728                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1729                                 "Read device characteristic failed, rc=%d", rc);
1730                 goto out_err3;
1731         }
1732
1733         if ((device->features & DASD_FEATURE_USERAW) &&
1734             !(private->rdc_data.facilities.RT_in_LR)) {
1735                 dev_err(&device->cdev->dev, "The storage server does not "
1736                         "support raw-track access\n");
1737                 rc = -EINVAL;
1738                 goto out_err3;
1739         }
1740
1741         /* find the valid cylinder size */
1742         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1743             private->rdc_data.long_no_cyl)
1744                 private->real_cyl = private->rdc_data.long_no_cyl;
1745         else
1746                 private->real_cyl = private->rdc_data.no_cyl;
1747
1748         private->fcx_max_data = get_fcx_max_data(device);
1749
1750         readonly = dasd_device_is_ro(device);
1751         if (readonly)
1752                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1753
1754         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1755                  "with %d cylinders, %d heads, %d sectors%s\n",
1756                  private->rdc_data.dev_type,
1757                  private->rdc_data.dev_model,
1758                  private->rdc_data.cu_type,
1759                  private->rdc_data.cu_model.model,
1760                  private->real_cyl,
1761                  private->rdc_data.trk_per_cyl,
1762                  private->rdc_data.sec_per_trk,
1763                  readonly ? ", read-only device" : "");
1764         return 0;
1765
1766 out_err3:
1767         dasd_alias_disconnect_device_from_lcu(device);
1768 out_err2:
1769         dasd_free_block(device->block);
1770         device->block = NULL;
1771 out_err1:
1772         kfree(private->conf_data);
1773         kfree(device->private);
1774         device->private = NULL;
1775         return rc;
1776 }
1777
1778 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1779 {
1780         struct dasd_eckd_private *private;
1781
1782         private = (struct dasd_eckd_private *) device->private;
1783         dasd_alias_disconnect_device_from_lcu(device);
1784         private->ned = NULL;
1785         private->sneq = NULL;
1786         private->vdsneq = NULL;
1787         private->gneq = NULL;
1788         private->conf_len = 0;
1789         kfree(private->conf_data);
1790         private->conf_data = NULL;
1791 }
1792
1793 static struct dasd_ccw_req *
1794 dasd_eckd_analysis_ccw(struct dasd_device *device)
1795 {
1796         struct dasd_eckd_private *private;
1797         struct eckd_count *count_data;
1798         struct LO_eckd_data *LO_data;
1799         struct dasd_ccw_req *cqr;
1800         struct ccw1 *ccw;
1801         int cplength, datasize;
1802         int i;
1803
1804         private = (struct dasd_eckd_private *) device->private;
1805
1806         cplength = 8;
1807         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1808         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1809         if (IS_ERR(cqr))
1810                 return cqr;
1811         ccw = cqr->cpaddr;
1812         /* Define extent for the first 3 tracks. */
1813         define_extent(ccw++, cqr->data, 0, 2,
1814                       DASD_ECKD_CCW_READ_COUNT, device);
1815         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1816         /* Locate record for the first 4 records on track 0. */
1817         ccw[-1].flags |= CCW_FLAG_CC;
1818         locate_record(ccw++, LO_data++, 0, 0, 4,
1819                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1820
1821         count_data = private->count_area;
1822         for (i = 0; i < 4; i++) {
1823                 ccw[-1].flags |= CCW_FLAG_CC;
1824                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1825                 ccw->flags = 0;
1826                 ccw->count = 8;
1827                 ccw->cda = (__u32)(addr_t) count_data;
1828                 ccw++;
1829                 count_data++;
1830         }
1831
1832         /* Locate record for the first record on track 2. */
1833         ccw[-1].flags |= CCW_FLAG_CC;
1834         locate_record(ccw++, LO_data++, 2, 0, 1,
1835                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1836         /* Read count ccw. */
1837         ccw[-1].flags |= CCW_FLAG_CC;
1838         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1839         ccw->flags = 0;
1840         ccw->count = 8;
1841         ccw->cda = (__u32)(addr_t) count_data;
1842
1843         cqr->block = NULL;
1844         cqr->startdev = device;
1845         cqr->memdev = device;
1846         cqr->retries = 255;
1847         cqr->buildclk = get_tod_clock();
1848         cqr->status = DASD_CQR_FILLED;
1849         return cqr;
1850 }
1851
1852 /* differentiate between 'no record found' and any other error */
1853 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1854 {
1855         char *sense;
1856         if (init_cqr->status == DASD_CQR_DONE)
1857                 return INIT_CQR_OK;
1858         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1859                  init_cqr->status == DASD_CQR_FAILED) {
1860                 sense = dasd_get_sense(&init_cqr->irb);
1861                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1862                         return INIT_CQR_UNFORMATTED;
1863                 else
1864                         return INIT_CQR_ERROR;
1865         } else
1866                 return INIT_CQR_ERROR;
1867 }
1868
1869 /*
1870  * This is the callback function for the init_analysis cqr. It saves
1871  * the status of the initial analysis ccw before it frees it and kicks
1872  * the device to continue the startup sequence. This will call
1873  * dasd_eckd_do_analysis again (if the devices has not been marked
1874  * for deletion in the meantime).
1875  */
1876 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1877                                         void *data)
1878 {
1879         struct dasd_eckd_private *private;
1880         struct dasd_device *device;
1881
1882         device = init_cqr->startdev;
1883         private = (struct dasd_eckd_private *) device->private;
1884         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1885         dasd_sfree_request(init_cqr, device);
1886         dasd_kick_device(device);
1887 }
1888
1889 static int dasd_eckd_start_analysis(struct dasd_block *block)
1890 {
1891         struct dasd_ccw_req *init_cqr;
1892
1893         init_cqr = dasd_eckd_analysis_ccw(block->base);
1894         if (IS_ERR(init_cqr))
1895                 return PTR_ERR(init_cqr);
1896         init_cqr->callback = dasd_eckd_analysis_callback;
1897         init_cqr->callback_data = NULL;
1898         init_cqr->expires = 5*HZ;
1899         /* first try without ERP, so we can later handle unformatted
1900          * devices as special case
1901          */
1902         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1903         init_cqr->retries = 0;
1904         dasd_add_request_head(init_cqr);
1905         return -EAGAIN;
1906 }
1907
1908 static int dasd_eckd_end_analysis(struct dasd_block *block)
1909 {
1910         struct dasd_device *device;
1911         struct dasd_eckd_private *private;
1912         struct eckd_count *count_area;
1913         unsigned int sb, blk_per_trk;
1914         int status, i;
1915         struct dasd_ccw_req *init_cqr;
1916
1917         device = block->base;
1918         private = (struct dasd_eckd_private *) device->private;
1919         status = private->init_cqr_status;
1920         private->init_cqr_status = -1;
1921         if (status == INIT_CQR_ERROR) {
1922                 /* try again, this time with full ERP */
1923                 init_cqr = dasd_eckd_analysis_ccw(device);
1924                 dasd_sleep_on(init_cqr);
1925                 status = dasd_eckd_analysis_evaluation(init_cqr);
1926                 dasd_sfree_request(init_cqr, device);
1927         }
1928
1929         if (device->features & DASD_FEATURE_USERAW) {
1930                 block->bp_block = DASD_RAW_BLOCKSIZE;
1931                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1932                 block->s2b_shift = 3;
1933                 goto raw;
1934         }
1935
1936         if (status == INIT_CQR_UNFORMATTED) {
1937                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1938                 return -EMEDIUMTYPE;
1939         } else if (status == INIT_CQR_ERROR) {
1940                 dev_err(&device->cdev->dev,
1941                         "Detecting the DASD disk layout failed because "
1942                         "of an I/O error\n");
1943                 return -EIO;
1944         }
1945
1946         private->uses_cdl = 1;
1947         /* Check Track 0 for Compatible Disk Layout */
1948         count_area = NULL;
1949         for (i = 0; i < 3; i++) {
1950                 if (private->count_area[i].kl != 4 ||
1951                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
1952                     private->count_area[i].cyl != 0 ||
1953                     private->count_area[i].head != count_area_head[i] ||
1954                     private->count_area[i].record != count_area_rec[i]) {
1955                         private->uses_cdl = 0;
1956                         break;
1957                 }
1958         }
1959         if (i == 3)
1960                 count_area = &private->count_area[4];
1961
1962         if (private->uses_cdl == 0) {
1963                 for (i = 0; i < 5; i++) {
1964                         if ((private->count_area[i].kl != 0) ||
1965                             (private->count_area[i].dl !=
1966                              private->count_area[0].dl) ||
1967                             private->count_area[i].cyl !=  0 ||
1968                             private->count_area[i].head != count_area_head[i] ||
1969                             private->count_area[i].record != count_area_rec[i])
1970                                 break;
1971                 }
1972                 if (i == 5)
1973                         count_area = &private->count_area[0];
1974         } else {
1975                 if (private->count_area[3].record == 1)
1976                         dev_warn(&device->cdev->dev,
1977                                  "Track 0 has no records following the VTOC\n");
1978         }
1979
1980         if (count_area != NULL && count_area->kl == 0) {
1981                 /* we found notthing violating our disk layout */
1982                 if (dasd_check_blocksize(count_area->dl) == 0)
1983                         block->bp_block = count_area->dl;
1984         }
1985         if (block->bp_block == 0) {
1986                 dev_warn(&device->cdev->dev,
1987                          "The disk layout of the DASD is not supported\n");
1988                 return -EMEDIUMTYPE;
1989         }
1990         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1991         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1992                 block->s2b_shift++;
1993
1994         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1995
1996 raw:
1997         block->blocks = (private->real_cyl *
1998                           private->rdc_data.trk_per_cyl *
1999                           blk_per_trk);
2000
2001         dev_info(&device->cdev->dev,
2002                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
2003                  "%s\n", (block->bp_block >> 10),
2004                  ((private->real_cyl *
2005                    private->rdc_data.trk_per_cyl *
2006                    blk_per_trk * (block->bp_block >> 9)) >> 1),
2007                  ((blk_per_trk * block->bp_block) >> 10),
2008                  private->uses_cdl ?
2009                  "compatible disk layout" : "linux disk layout");
2010
2011         return 0;
2012 }
2013
2014 static int dasd_eckd_do_analysis(struct dasd_block *block)
2015 {
2016         struct dasd_eckd_private *private;
2017
2018         private = (struct dasd_eckd_private *) block->base->private;
2019         if (private->init_cqr_status < 0)
2020                 return dasd_eckd_start_analysis(block);
2021         else
2022                 return dasd_eckd_end_analysis(block);
2023 }
2024
2025 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2026 {
2027         return dasd_alias_add_device(device);
2028 };
2029
2030 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2031 {
2032         cancel_work_sync(&device->reload_device);
2033         cancel_work_sync(&device->kick_validate);
2034         return 0;
2035 };
2036
2037 static int dasd_eckd_ready_to_basic(struct dasd_device *device)
2038 {
2039         return dasd_alias_remove_device(device);
2040 };
2041
2042 static int
2043 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2044 {
2045         struct dasd_eckd_private *private;
2046
2047         private = (struct dasd_eckd_private *) block->base->private;
2048         if (dasd_check_blocksize(block->bp_block) == 0) {
2049                 geo->sectors = recs_per_track(&private->rdc_data,
2050                                               0, block->bp_block);
2051         }
2052         geo->cylinders = private->rdc_data.no_cyl;
2053         geo->heads = private->rdc_data.trk_per_cyl;
2054         return 0;
2055 }
2056
2057 static struct dasd_ccw_req *
2058 dasd_eckd_build_format(struct dasd_device *base,
2059                        struct format_data_t *fdata)
2060 {
2061         struct dasd_eckd_private *base_priv;
2062         struct dasd_eckd_private *start_priv;
2063         struct dasd_device *startdev;
2064         struct dasd_ccw_req *fcp;
2065         struct eckd_count *ect;
2066         struct ch_t address;
2067         struct ccw1 *ccw;
2068         void *data;
2069         int rpt;
2070         int cplength, datasize;
2071         int i, j;
2072         int intensity = 0;
2073         int r0_perm;
2074         int nr_tracks;
2075
2076         startdev = dasd_alias_get_start_dev(base);
2077         if (!startdev)
2078                 startdev = base;
2079
2080         start_priv = (struct dasd_eckd_private *) startdev->private;
2081         base_priv = (struct dasd_eckd_private *) base->private;
2082
2083         rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2084
2085         nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2086
2087         /*
2088          * fdata->intensity is a bit string that tells us what to do:
2089          *   Bit 0: write record zero
2090          *   Bit 1: write home address, currently not supported
2091          *   Bit 2: invalidate tracks
2092          *   Bit 3: use OS/390 compatible disk layout (cdl)
2093          *   Bit 4: do not allow storage subsystem to modify record zero
2094          * Only some bit combinations do make sense.
2095          */
2096         if (fdata->intensity & 0x10) {
2097                 r0_perm = 0;
2098                 intensity = fdata->intensity & ~0x10;
2099         } else {
2100                 r0_perm = 1;
2101                 intensity = fdata->intensity;
2102         }
2103
2104         switch (intensity) {
2105         case 0x00:      /* Normal format */
2106         case 0x08:      /* Normal format, use cdl. */
2107                 cplength = 2 + (rpt*nr_tracks);
2108                 datasize = sizeof(struct PFX_eckd_data) +
2109                         sizeof(struct LO_eckd_data) +
2110                         rpt * nr_tracks * sizeof(struct eckd_count);
2111                 break;
2112         case 0x01:      /* Write record zero and format track. */
2113         case 0x09:      /* Write record zero and format track, use cdl. */
2114                 cplength = 2 + rpt * nr_tracks;
2115                 datasize = sizeof(struct PFX_eckd_data) +
2116                         sizeof(struct LO_eckd_data) +
2117                         sizeof(struct eckd_count) +
2118                         rpt * nr_tracks * sizeof(struct eckd_count);
2119                 break;
2120         case 0x04:      /* Invalidate track. */
2121         case 0x0c:      /* Invalidate track, use cdl. */
2122                 cplength = 3;
2123                 datasize = sizeof(struct PFX_eckd_data) +
2124                         sizeof(struct LO_eckd_data) +
2125                         sizeof(struct eckd_count);
2126                 break;
2127         default:
2128                 dev_warn(&startdev->cdev->dev,
2129                          "An I/O control call used incorrect flags 0x%x\n",
2130                          fdata->intensity);
2131                 return ERR_PTR(-EINVAL);
2132         }
2133         /* Allocate the format ccw request. */
2134         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
2135                                    datasize, startdev);
2136         if (IS_ERR(fcp))
2137                 return fcp;
2138
2139         start_priv->count++;
2140         data = fcp->data;
2141         ccw = fcp->cpaddr;
2142
2143         switch (intensity & ~0x08) {
2144         case 0x00: /* Normal format. */
2145                 prefix(ccw++, (struct PFX_eckd_data *) data,
2146                        fdata->start_unit, fdata->stop_unit,
2147                        DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2148                 /* grant subsystem permission to format R0 */
2149                 if (r0_perm)
2150                         ((struct PFX_eckd_data *)data)
2151                                 ->define_extent.ga_extended |= 0x04;
2152                 data += sizeof(struct PFX_eckd_data);
2153                 ccw[-1].flags |= CCW_FLAG_CC;
2154                 locate_record(ccw++, (struct LO_eckd_data *) data,
2155                               fdata->start_unit, 0, rpt*nr_tracks,
2156                               DASD_ECKD_CCW_WRITE_CKD, base,
2157                               fdata->blksize);
2158                 data += sizeof(struct LO_eckd_data);
2159                 break;
2160         case 0x01: /* Write record zero + format track. */
2161                 prefix(ccw++, (struct PFX_eckd_data *) data,
2162                        fdata->start_unit, fdata->stop_unit,
2163                        DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2164                        base, startdev);
2165                 data += sizeof(struct PFX_eckd_data);
2166                 ccw[-1].flags |= CCW_FLAG_CC;
2167                 locate_record(ccw++, (struct LO_eckd_data *) data,
2168                               fdata->start_unit, 0, rpt * nr_tracks + 1,
2169                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2170                               base->block->bp_block);
2171                 data += sizeof(struct LO_eckd_data);
2172                 break;
2173         case 0x04: /* Invalidate track. */
2174                 prefix(ccw++, (struct PFX_eckd_data *) data,
2175                        fdata->start_unit, fdata->stop_unit,
2176                        DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2177                 data += sizeof(struct PFX_eckd_data);
2178                 ccw[-1].flags |= CCW_FLAG_CC;
2179                 locate_record(ccw++, (struct LO_eckd_data *) data,
2180                               fdata->start_unit, 0, 1,
2181                               DASD_ECKD_CCW_WRITE_CKD, base, 8);
2182                 data += sizeof(struct LO_eckd_data);
2183                 break;
2184         }
2185
2186         for (j = 0; j < nr_tracks; j++) {
2187                 /* calculate cylinder and head for the current track */
2188                 set_ch_t(&address,
2189                          (fdata->start_unit + j) /
2190                          base_priv->rdc_data.trk_per_cyl,
2191                          (fdata->start_unit + j) %
2192                          base_priv->rdc_data.trk_per_cyl);
2193                 if (intensity & 0x01) { /* write record zero */
2194                         ect = (struct eckd_count *) data;
2195                         data += sizeof(struct eckd_count);
2196                         ect->cyl = address.cyl;
2197                         ect->head = address.head;
2198                         ect->record = 0;
2199                         ect->kl = 0;
2200                         ect->dl = 8;
2201                         ccw[-1].flags |= CCW_FLAG_CC;
2202                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2203                         ccw->flags = CCW_FLAG_SLI;
2204                         ccw->count = 8;
2205                         ccw->cda = (__u32)(addr_t) ect;
2206                         ccw++;
2207                 }
2208                 if ((intensity & ~0x08) & 0x04) {       /* erase track */
2209                         ect = (struct eckd_count *) data;
2210                         data += sizeof(struct eckd_count);
2211                         ect->cyl = address.cyl;
2212                         ect->head = address.head;
2213                         ect->record = 1;
2214                         ect->kl = 0;
2215                         ect->dl = 0;
2216                         ccw[-1].flags |= CCW_FLAG_CC;
2217                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2218                         ccw->flags = CCW_FLAG_SLI;
2219                         ccw->count = 8;
2220                         ccw->cda = (__u32)(addr_t) ect;
2221                 } else {                /* write remaining records */
2222                         for (i = 0; i < rpt; i++) {
2223                                 ect = (struct eckd_count *) data;
2224                                 data += sizeof(struct eckd_count);
2225                                 ect->cyl = address.cyl;
2226                                 ect->head = address.head;
2227                                 ect->record = i + 1;
2228                                 ect->kl = 0;
2229                                 ect->dl = fdata->blksize;
2230                                 /*
2231                                  * Check for special tracks 0-1
2232                                  * when formatting CDL
2233                                  */
2234                                 if ((intensity & 0x08) &&
2235                                     fdata->start_unit == 0) {
2236                                         if (i < 3) {
2237                                                 ect->kl = 4;
2238                                                 ect->dl = sizes_trk0[i] - 4;
2239                                         }
2240                                 }
2241                                 if ((intensity & 0x08) &&
2242                                     fdata->start_unit == 1) {
2243                                         ect->kl = 44;
2244                                         ect->dl = LABEL_SIZE - 44;
2245                                 }
2246                                 ccw[-1].flags |= CCW_FLAG_CC;
2247                                 if (i != 0 || j == 0)
2248                                         ccw->cmd_code =
2249                                                 DASD_ECKD_CCW_WRITE_CKD;
2250                                 else
2251                                         ccw->cmd_code =
2252                                                 DASD_ECKD_CCW_WRITE_CKD_MT;
2253                                 ccw->flags = CCW_FLAG_SLI;
2254                                 ccw->count = 8;
2255                                         ccw->cda = (__u32)(addr_t) ect;
2256                                         ccw++;
2257                         }
2258                 }
2259         }
2260
2261         fcp->startdev = startdev;
2262         fcp->memdev = startdev;
2263         fcp->retries = 256;
2264         fcp->expires = startdev->default_expires * HZ;
2265         fcp->buildclk = get_tod_clock();
2266         fcp->status = DASD_CQR_FILLED;
2267
2268         return fcp;
2269 }
2270
2271 static int
2272 dasd_eckd_format_device(struct dasd_device *base,
2273                         struct format_data_t *fdata)
2274 {
2275         struct dasd_ccw_req *cqr, *n;
2276         struct dasd_block *block;
2277         struct dasd_eckd_private *private;
2278         struct list_head format_queue;
2279         struct dasd_device *device;
2280         int old_stop, format_step;
2281         int step, rc = 0;
2282
2283         block = base->block;
2284         private = (struct dasd_eckd_private *) base->private;
2285
2286         /* Sanity checks. */
2287         if (fdata->start_unit >=
2288             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2289                 dev_warn(&base->cdev->dev,
2290                          "Start track number %u used in formatting is too big\n",
2291                          fdata->start_unit);
2292                 return -EINVAL;
2293         }
2294         if (fdata->stop_unit >=
2295             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2296                 dev_warn(&base->cdev->dev,
2297                          "Stop track number %u used in formatting is too big\n",
2298                          fdata->stop_unit);
2299                 return -EINVAL;
2300         }
2301         if (fdata->start_unit > fdata->stop_unit) {
2302                 dev_warn(&base->cdev->dev,
2303                          "Start track %u used in formatting exceeds end track\n",
2304                          fdata->start_unit);
2305                 return -EINVAL;
2306         }
2307         if (dasd_check_blocksize(fdata->blksize) != 0) {
2308                 dev_warn(&base->cdev->dev,
2309                          "The DASD cannot be formatted with block size %u\n",
2310                          fdata->blksize);
2311                 return -EINVAL;
2312         }
2313
2314         INIT_LIST_HEAD(&format_queue);
2315         old_stop = fdata->stop_unit;
2316
2317         while (fdata->start_unit <= 1) {
2318                 fdata->stop_unit = fdata->start_unit;
2319                 cqr = dasd_eckd_build_format(base, fdata);
2320                 list_add(&cqr->blocklist, &format_queue);
2321
2322                 fdata->stop_unit = old_stop;
2323                 fdata->start_unit++;
2324
2325                 if (fdata->start_unit > fdata->stop_unit)
2326                         goto sleep;
2327         }
2328
2329 retry:
2330         format_step = 255 / recs_per_track(&private->rdc_data, 0,
2331                                            fdata->blksize);
2332         while (fdata->start_unit <= old_stop) {
2333                 step = fdata->stop_unit - fdata->start_unit + 1;
2334                 if (step > format_step)
2335                         fdata->stop_unit = fdata->start_unit + format_step - 1;
2336
2337                 cqr = dasd_eckd_build_format(base, fdata);
2338                 if (IS_ERR(cqr)) {
2339                         if (PTR_ERR(cqr) == -ENOMEM) {
2340                                 /*
2341                                  * not enough memory available
2342                                  * go to out and start requests
2343                                  * retry after first requests were finished
2344                                  */
2345                                 fdata->stop_unit = old_stop;
2346                                 goto sleep;
2347                         } else
2348                                 return PTR_ERR(cqr);
2349                 }
2350                 list_add(&cqr->blocklist, &format_queue);
2351
2352                 fdata->start_unit = fdata->stop_unit + 1;
2353                 fdata->stop_unit = old_stop;
2354         }
2355
2356 sleep:
2357         dasd_sleep_on_queue(&format_queue);
2358
2359         list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
2360                 device = cqr->startdev;
2361                 private = (struct dasd_eckd_private *) device->private;
2362                 if (cqr->status == DASD_CQR_FAILED)
2363                         rc = -EIO;
2364                 list_del_init(&cqr->blocklist);
2365                 dasd_sfree_request(cqr, device);
2366                 private->count--;
2367         }
2368
2369         /*
2370          * in case of ENOMEM we need to retry after
2371          * first requests are finished
2372          */
2373         if (fdata->start_unit <= fdata->stop_unit)
2374                 goto retry;
2375
2376         return rc;
2377 }
2378
2379 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2380 {
2381         cqr->status = DASD_CQR_FILLED;
2382         if (cqr->block && (cqr->startdev != cqr->block->base)) {
2383                 dasd_eckd_reset_ccw_to_base_io(cqr);
2384                 cqr->startdev = cqr->block->base;
2385                 cqr->lpm = cqr->block->base->path_data.opm;
2386         }
2387 };
2388
2389 static dasd_erp_fn_t
2390 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2391 {
2392         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2393         struct ccw_device *cdev = device->cdev;
2394
2395         switch (cdev->id.cu_type) {
2396         case 0x3990:
2397         case 0x2105:
2398         case 0x2107:
2399         case 0x1750:
2400                 return dasd_3990_erp_action;
2401         case 0x9343:
2402         case 0x3880:
2403         default:
2404                 return dasd_default_erp_action;
2405         }
2406 }
2407
2408 static dasd_erp_fn_t
2409 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2410 {
2411         return dasd_default_erp_postaction;
2412 }
2413
2414 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2415                                               struct dasd_ccw_req *cqr,
2416                                               struct irb *irb)
2417 {
2418         char mask;
2419         char *sense = NULL;
2420         struct dasd_eckd_private *private;
2421
2422         private = (struct dasd_eckd_private *) device->private;
2423         /* first of all check for state change pending interrupt */
2424         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2425         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2426                 /*
2427                  * for alias only, not in offline processing
2428                  * and only if not suspended
2429                  */
2430                 if (!device->block && private->lcu &&
2431                     device->state == DASD_STATE_ONLINE &&
2432                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2433                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2434                         /*
2435                          * the state change could be caused by an alias
2436                          * reassignment remove device from alias handling
2437                          * to prevent new requests from being scheduled on
2438                          * the wrong alias device
2439                          */
2440                         dasd_alias_remove_device(device);
2441
2442                         /* schedule worker to reload device */
2443                         dasd_reload_device(device);
2444                 }
2445                 dasd_generic_handle_state_change(device);
2446                 return;
2447         }
2448
2449         sense = dasd_get_sense(irb);
2450         if (!sense)
2451                 return;
2452
2453         /* summary unit check */
2454         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2455             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2456                 dasd_alias_handle_summary_unit_check(device, irb);
2457                 return;
2458         }
2459
2460         /* service information message SIM */
2461         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
2462             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
2463                 dasd_3990_erp_handle_sim(device, sense);
2464                 return;
2465         }
2466
2467         /* loss of device reservation is handled via base devices only
2468          * as alias devices may be used with several bases
2469          */
2470         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
2471             (sense[7] == 0x3F) &&
2472             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
2473             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
2474                 if (device->features & DASD_FEATURE_FAILONSLCK)
2475                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
2476                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
2477                 dev_err(&device->cdev->dev,
2478                         "The device reservation was lost\n");
2479         }
2480 }
2481
2482 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
2483                                                struct dasd_device *startdev,
2484                                                struct dasd_block *block,
2485                                                struct request *req,
2486                                                sector_t first_rec,
2487                                                sector_t last_rec,
2488                                                sector_t first_trk,
2489                                                sector_t last_trk,
2490                                                unsigned int first_offs,
2491                                                unsigned int last_offs,
2492                                                unsigned int blk_per_trk,
2493                                                unsigned int blksize)
2494 {
2495         struct dasd_eckd_private *private;
2496         unsigned long *idaws;
2497         struct LO_eckd_data *LO_data;
2498         struct dasd_ccw_req *cqr;
2499         struct ccw1 *ccw;
2500         struct req_iterator iter;
2501         struct bio_vec *bv;
2502         char *dst;
2503         unsigned int off;
2504         int count, cidaw, cplength, datasize;
2505         sector_t recid;
2506         unsigned char cmd, rcmd;
2507         int use_prefix;
2508         struct dasd_device *basedev;
2509
2510         basedev = block->base;
2511         private = (struct dasd_eckd_private *) basedev->private;
2512         if (rq_data_dir(req) == READ)
2513                 cmd = DASD_ECKD_CCW_READ_MT;
2514         else if (rq_data_dir(req) == WRITE)
2515                 cmd = DASD_ECKD_CCW_WRITE_MT;
2516         else
2517                 return ERR_PTR(-EINVAL);
2518
2519         /* Check struct bio and count the number of blocks for the request. */
2520         count = 0;
2521         cidaw = 0;
2522         rq_for_each_segment(bv, req, iter) {
2523                 if (bv->bv_len & (blksize - 1))
2524                         /* Eckd can only do full blocks. */
2525                         return ERR_PTR(-EINVAL);
2526                 count += bv->bv_len >> (block->s2b_shift + 9);
2527 #if defined(CONFIG_64BIT)
2528                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
2529                         cidaw += bv->bv_len >> (block->s2b_shift + 9);
2530 #endif
2531         }
2532         /* Paranoia. */
2533         if (count != last_rec - first_rec + 1)
2534                 return ERR_PTR(-EINVAL);
2535
2536         /* use the prefix command if available */
2537         use_prefix = private->features.feature[8] & 0x01;
2538         if (use_prefix) {
2539                 /* 1x prefix + number of blocks */
2540                 cplength = 2 + count;
2541                 /* 1x prefix + cidaws*sizeof(long) */
2542                 datasize = sizeof(struct PFX_eckd_data) +
2543                         sizeof(struct LO_eckd_data) +
2544                         cidaw * sizeof(unsigned long);
2545         } else {
2546                 /* 1x define extent + 1x locate record + number of blocks */
2547                 cplength = 2 + count;
2548                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
2549                 datasize = sizeof(struct DE_eckd_data) +
2550                         sizeof(struct LO_eckd_data) +
2551                         cidaw * sizeof(unsigned long);
2552         }
2553         /* Find out the number of additional locate record ccws for cdl. */
2554         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
2555                 if (last_rec >= 2*blk_per_trk)
2556                         count = 2*blk_per_trk - first_rec;
2557                 cplength += count;
2558                 datasize += count*sizeof(struct LO_eckd_data);
2559         }
2560         /* Allocate the ccw request. */
2561         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2562                                    startdev);
2563         if (IS_ERR(cqr))
2564                 return cqr;
2565         ccw = cqr->cpaddr;
2566         /* First ccw is define extent or prefix. */
2567         if (use_prefix) {
2568                 if (prefix(ccw++, cqr->data, first_trk,
2569                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
2570                         /* Clock not in sync and XRC is enabled.
2571                          * Try again later.
2572                          */
2573                         dasd_sfree_request(cqr, startdev);
2574                         return ERR_PTR(-EAGAIN);
2575                 }
2576                 idaws = (unsigned long *) (cqr->data +
2577                                            sizeof(struct PFX_eckd_data));
2578         } else {
2579                 if (define_extent(ccw++, cqr->data, first_trk,
2580                                   last_trk, cmd, basedev) == -EAGAIN) {
2581                         /* Clock not in sync and XRC is enabled.
2582                          * Try again later.
2583                          */
2584                         dasd_sfree_request(cqr, startdev);
2585                         return ERR_PTR(-EAGAIN);
2586                 }
2587                 idaws = (unsigned long *) (cqr->data +
2588                                            sizeof(struct DE_eckd_data));
2589         }
2590         /* Build locate_record+read/write/ccws. */
2591         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
2592         recid = first_rec;
2593         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
2594                 /* Only standard blocks so there is just one locate record. */
2595                 ccw[-1].flags |= CCW_FLAG_CC;
2596                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
2597                               last_rec - recid + 1, cmd, basedev, blksize);
2598         }
2599         rq_for_each_segment(bv, req, iter) {
2600                 dst = page_address(bv->bv_page) + bv->bv_offset;
2601                 if (dasd_page_cache) {
2602                         char *copy = kmem_cache_alloc(dasd_page_cache,
2603                                                       GFP_DMA | __GFP_NOWARN);
2604                         if (copy && rq_data_dir(req) == WRITE)
2605                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
2606                         if (copy)
2607                                 dst = copy + bv->bv_offset;
2608                 }
2609                 for (off = 0; off < bv->bv_len; off += blksize) {
2610                         sector_t trkid = recid;
2611                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
2612                         rcmd = cmd;
2613                         count = blksize;
2614                         /* Locate record for cdl special block ? */
2615                         if (private->uses_cdl && recid < 2*blk_per_trk) {
2616                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
2617                                         rcmd |= 0x8;
2618                                         count = dasd_eckd_cdl_reclen(recid);
2619                                         if (count < blksize &&
2620                                             rq_data_dir(req) == READ)
2621                                                 memset(dst + count, 0xe5,
2622                                                        blksize - count);
2623                                 }
2624                                 ccw[-1].flags |= CCW_FLAG_CC;
2625                                 locate_record(ccw++, LO_data++,
2626                                               trkid, recoffs + 1,
2627                                               1, rcmd, basedev, count);
2628                         }
2629                         /* Locate record for standard blocks ? */
2630                         if (private->uses_cdl && recid == 2*blk_per_trk) {
2631                                 ccw[-1].flags |= CCW_FLAG_CC;
2632                                 locate_record(ccw++, LO_data++,
2633                                               trkid, recoffs + 1,
2634                                               last_rec - recid + 1,
2635                                               cmd, basedev, count);
2636                         }
2637                         /* Read/write ccw. */
2638                         ccw[-1].flags |= CCW_FLAG_CC;
2639                         ccw->cmd_code = rcmd;
2640                         ccw->count = count;
2641                         if (idal_is_needed(dst, blksize)) {
2642                                 ccw->cda = (__u32)(addr_t) idaws;
2643                                 ccw->flags = CCW_FLAG_IDA;
2644                                 idaws = idal_create_words(idaws, dst, blksize);
2645                         } else {
2646                                 ccw->cda = (__u32)(addr_t) dst;
2647                                 ccw->flags = 0;
2648                         }
2649                         ccw++;
2650                         dst += blksize;
2651                         recid++;
2652                 }
2653         }
2654         if (blk_noretry_request(req) ||
2655             block->base->features & DASD_FEATURE_FAILFAST)
2656                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2657         cqr->startdev = startdev;
2658         cqr->memdev = startdev;
2659         cqr->block = block;
2660         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2661         cqr->lpm = startdev->path_data.ppm;
2662         cqr->retries = 256;
2663         cqr->buildclk = get_tod_clock();
2664         cqr->status = DASD_CQR_FILLED;
2665         return cqr;
2666 }
2667
2668 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
2669                                                struct dasd_device *startdev,
2670                                                struct dasd_block *block,
2671                                                struct request *req,
2672                                                sector_t first_rec,
2673                                                sector_t last_rec,
2674                                                sector_t first_trk,
2675                                                sector_t last_trk,
2676                                                unsigned int first_offs,
2677                                                unsigned int last_offs,
2678                                                unsigned int blk_per_trk,
2679                                                unsigned int blksize)
2680 {
2681         unsigned long *idaws;
2682         struct dasd_ccw_req *cqr;
2683         struct ccw1 *ccw;
2684         struct req_iterator iter;
2685         struct bio_vec *bv;
2686         char *dst, *idaw_dst;
2687         unsigned int cidaw, cplength, datasize;
2688         unsigned int tlf;
2689         sector_t recid;
2690         unsigned char cmd;
2691         struct dasd_device *basedev;
2692         unsigned int trkcount, count, count_to_trk_end;
2693         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
2694         unsigned char new_track, end_idaw;
2695         sector_t trkid;
2696         unsigned int recoffs;
2697
2698         basedev = block->base;
2699         if (rq_data_dir(req) == READ)
2700                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2701         else if (rq_data_dir(req) == WRITE)
2702                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2703         else
2704                 return ERR_PTR(-EINVAL);
2705
2706         /* Track based I/O needs IDAWs for each page, and not just for
2707          * 64 bit addresses. We need additional idals for pages
2708          * that get filled from two tracks, so we use the number
2709          * of records as upper limit.
2710          */
2711         cidaw = last_rec - first_rec + 1;
2712         trkcount = last_trk - first_trk + 1;
2713
2714         /* 1x prefix + one read/write ccw per track */
2715         cplength = 1 + trkcount;
2716
2717         /* on 31-bit we need space for two 32 bit addresses per page
2718          * on 64-bit one 64 bit address
2719          */
2720         datasize = sizeof(struct PFX_eckd_data) +
2721                 cidaw * sizeof(unsigned long long);
2722
2723         /* Allocate the ccw request. */
2724         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2725                                    startdev);
2726         if (IS_ERR(cqr))
2727                 return cqr;
2728         ccw = cqr->cpaddr;
2729         /* transfer length factor: how many bytes to read from the last track */
2730         if (first_trk == last_trk)
2731                 tlf = last_offs - first_offs + 1;
2732         else
2733                 tlf = last_offs + 1;
2734         tlf *= blksize;
2735
2736         if (prefix_LRE(ccw++, cqr->data, first_trk,
2737                        last_trk, cmd, basedev, startdev,
2738                        1 /* format */, first_offs + 1,
2739                        trkcount, blksize,
2740                        tlf) == -EAGAIN) {
2741                 /* Clock not in sync and XRC is enabled.
2742                  * Try again later.
2743                  */
2744                 dasd_sfree_request(cqr, startdev);
2745                 return ERR_PTR(-EAGAIN);
2746         }
2747
2748         /*
2749          * The translation of request into ccw programs must meet the
2750          * following conditions:
2751          * - all idaws but the first and the last must address full pages
2752          *   (or 2K blocks on 31-bit)
2753          * - the scope of a ccw and it's idal ends with the track boundaries
2754          */
2755         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2756         recid = first_rec;
2757         new_track = 1;
2758         end_idaw = 0;
2759         len_to_track_end = 0;
2760         idaw_dst = NULL;
2761         idaw_len = 0;
2762         rq_for_each_segment(bv, req, iter) {
2763                 dst = page_address(bv->bv_page) + bv->bv_offset;
2764                 seg_len = bv->bv_len;
2765                 while (seg_len) {
2766                         if (new_track) {
2767                                 trkid = recid;
2768                                 recoffs = sector_div(trkid, blk_per_trk);
2769                                 count_to_trk_end = blk_per_trk - recoffs;
2770                                 count = min((last_rec - recid + 1),
2771                                             (sector_t)count_to_trk_end);
2772                                 len_to_track_end = count * blksize;
2773                                 ccw[-1].flags |= CCW_FLAG_CC;
2774                                 ccw->cmd_code = cmd;
2775                                 ccw->count = len_to_track_end;
2776                                 ccw->cda = (__u32)(addr_t)idaws;
2777                                 ccw->flags = CCW_FLAG_IDA;
2778                                 ccw++;
2779                                 recid += count;
2780                                 new_track = 0;
2781                                 /* first idaw for a ccw may start anywhere */
2782                                 if (!idaw_dst)
2783                                         idaw_dst = dst;
2784                         }
2785                         /* If we start a new idaw, we must make sure that it
2786                          * starts on an IDA_BLOCK_SIZE boundary.
2787                          * If we continue an idaw, we must make sure that the
2788                          * current segment begins where the so far accumulated
2789                          * idaw ends
2790                          */
2791                         if (!idaw_dst) {
2792                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2793                                         dasd_sfree_request(cqr, startdev);
2794                                         return ERR_PTR(-ERANGE);
2795                                 } else
2796                                         idaw_dst = dst;
2797                         }
2798                         if ((idaw_dst + idaw_len) != dst) {
2799                                 dasd_sfree_request(cqr, startdev);
2800                                 return ERR_PTR(-ERANGE);
2801                         }
2802                         part_len = min(seg_len, len_to_track_end);
2803                         seg_len -= part_len;
2804                         dst += part_len;
2805                         idaw_len += part_len;
2806                         len_to_track_end -= part_len;
2807                         /* collected memory area ends on an IDA_BLOCK border,
2808                          * -> create an idaw
2809                          * idal_create_words will handle cases where idaw_len
2810                          * is larger then IDA_BLOCK_SIZE
2811                          */
2812                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2813                                 end_idaw = 1;
2814                         /* We also need to end the idaw at track end */
2815                         if (!len_to_track_end) {
2816                                 new_track = 1;
2817                                 end_idaw = 1;
2818                         }
2819                         if (end_idaw) {
2820                                 idaws = idal_create_words(idaws, idaw_dst,
2821                                                           idaw_len);
2822                                 idaw_dst = NULL;
2823                                 idaw_len = 0;
2824                                 end_idaw = 0;
2825                         }
2826                 }
2827         }
2828
2829         if (blk_noretry_request(req) ||
2830             block->base->features & DASD_FEATURE_FAILFAST)
2831                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2832         cqr->startdev = startdev;
2833         cqr->memdev = startdev;
2834         cqr->block = block;
2835         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2836         cqr->lpm = startdev->path_data.ppm;
2837         cqr->retries = 256;
2838         cqr->buildclk = get_tod_clock();
2839         cqr->status = DASD_CQR_FILLED;
2840         return cqr;
2841 }
2842
2843 static int prepare_itcw(struct itcw *itcw,
2844                         unsigned int trk, unsigned int totrk, int cmd,
2845                         struct dasd_device *basedev,
2846                         struct dasd_device *startdev,
2847                         unsigned int rec_on_trk, int count,
2848                         unsigned int blksize,
2849                         unsigned int total_data_size,
2850                         unsigned int tlf,
2851                         unsigned int blk_per_trk)
2852 {
2853         struct PFX_eckd_data pfxdata;
2854         struct dasd_eckd_private *basepriv, *startpriv;
2855         struct DE_eckd_data *dedata;
2856         struct LRE_eckd_data *lredata;
2857         struct dcw *dcw;
2858
2859         u32 begcyl, endcyl;
2860         u16 heads, beghead, endhead;
2861         u8 pfx_cmd;
2862
2863         int rc = 0;
2864         int sector = 0;
2865         int dn, d;
2866
2867
2868         /* setup prefix data */
2869         basepriv = (struct dasd_eckd_private *) basedev->private;
2870         startpriv = (struct dasd_eckd_private *) startdev->private;
2871         dedata = &pfxdata.define_extent;
2872         lredata = &pfxdata.locate_record;
2873
2874         memset(&pfxdata, 0, sizeof(pfxdata));
2875         pfxdata.format = 1; /* PFX with LRE */
2876         pfxdata.base_address = basepriv->ned->unit_addr;
2877         pfxdata.base_lss = basepriv->ned->ID;
2878         pfxdata.validity.define_extent = 1;
2879
2880         /* private uid is kept up to date, conf_data may be outdated */
2881         if (startpriv->uid.type != UA_BASE_DEVICE) {
2882                 pfxdata.validity.verify_base = 1;
2883                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2884                         pfxdata.validity.hyper_pav = 1;
2885         }
2886
2887         switch (cmd) {
2888         case DASD_ECKD_CCW_READ_TRACK_DATA:
2889                 dedata->mask.perm = 0x1;
2890                 dedata->attributes.operation = basepriv->attrib.operation;
2891                 dedata->blk_size = blksize;
2892                 dedata->ga_extended |= 0x42;
2893                 lredata->operation.orientation = 0x0;
2894                 lredata->operation.operation = 0x0C;
2895                 lredata->auxiliary.check_bytes = 0x01;
2896                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2897                 break;
2898         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2899                 dedata->mask.perm = 0x02;
2900                 dedata->attributes.operation = basepriv->attrib.operation;
2901                 dedata->blk_size = blksize;
2902                 rc = check_XRC_on_prefix(&pfxdata, basedev);
2903                 dedata->ga_extended |= 0x42;
2904                 lredata->operation.orientation = 0x0;
2905                 lredata->operation.operation = 0x3F;
2906                 lredata->extended_operation = 0x23;
2907                 lredata->auxiliary.check_bytes = 0x2;
2908                 pfx_cmd = DASD_ECKD_CCW_PFX;
2909                 break;
2910         default:
2911                 DBF_DEV_EVENT(DBF_ERR, basedev,
2912                               "prepare itcw, unknown opcode 0x%x", cmd);
2913                 BUG();
2914                 break;
2915         }
2916         if (rc)
2917                 return rc;
2918
2919         dedata->attributes.mode = 0x3;  /* ECKD */
2920
2921         heads = basepriv->rdc_data.trk_per_cyl;
2922         begcyl = trk / heads;
2923         beghead = trk % heads;
2924         endcyl = totrk / heads;
2925         endhead = totrk % heads;
2926
2927         /* check for sequential prestage - enhance cylinder range */
2928         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2929             dedata->attributes.operation == DASD_SEQ_ACCESS) {
2930
2931                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2932                         endcyl += basepriv->attrib.nr_cyl;
2933                 else
2934                         endcyl = (basepriv->real_cyl - 1);
2935         }
2936
2937         set_ch_t(&dedata->beg_ext, begcyl, beghead);
2938         set_ch_t(&dedata->end_ext, endcyl, endhead);
2939
2940         dedata->ep_format = 0x20; /* records per track is valid */
2941         dedata->ep_rec_per_track = blk_per_trk;
2942
2943         if (rec_on_trk) {
2944                 switch (basepriv->rdc_data.dev_type) {
2945                 case 0x3390:
2946                         dn = ceil_quot(blksize + 6, 232);
2947                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
2948                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
2949                         break;
2950                 case 0x3380:
2951                         d = 7 + ceil_quot(blksize + 12, 32);
2952                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
2953                         break;
2954                 }
2955         }
2956
2957         lredata->auxiliary.length_valid = 1;
2958         lredata->auxiliary.length_scope = 1;
2959         lredata->auxiliary.imbedded_ccw_valid = 1;
2960         lredata->length = tlf;
2961         lredata->imbedded_ccw = cmd;
2962         lredata->count = count;
2963         lredata->sector = sector;
2964         set_ch_t(&lredata->seek_addr, begcyl, beghead);
2965         lredata->search_arg.cyl = lredata->seek_addr.cyl;
2966         lredata->search_arg.head = lredata->seek_addr.head;
2967         lredata->search_arg.record = rec_on_trk;
2968
2969         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
2970                      &pfxdata, sizeof(pfxdata), total_data_size);
2971         return IS_ERR(dcw) ? PTR_ERR(dcw) : 0;
2972 }
2973
2974 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
2975                                                struct dasd_device *startdev,
2976                                                struct dasd_block *block,
2977                                                struct request *req,
2978                                                sector_t first_rec,
2979                                                sector_t last_rec,
2980                                                sector_t first_trk,
2981                                                sector_t last_trk,
2982                                                unsigned int first_offs,
2983                                                unsigned int last_offs,
2984                                                unsigned int blk_per_trk,
2985                                                unsigned int blksize)
2986 {
2987         struct dasd_ccw_req *cqr;
2988         struct req_iterator iter;
2989         struct bio_vec *bv;
2990         char *dst;
2991         unsigned int trkcount, ctidaw;
2992         unsigned char cmd;
2993         struct dasd_device *basedev;
2994         unsigned int tlf;
2995         struct itcw *itcw;
2996         struct tidaw *last_tidaw = NULL;
2997         int itcw_op;
2998         size_t itcw_size;
2999         u8 tidaw_flags;
3000         unsigned int seg_len, part_len, len_to_track_end;
3001         unsigned char new_track;
3002         sector_t recid, trkid;
3003         unsigned int offs;
3004         unsigned int count, count_to_trk_end;
3005         int ret;
3006
3007         basedev = block->base;
3008         if (rq_data_dir(req) == READ) {
3009                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3010                 itcw_op = ITCW_OP_READ;
3011         } else if (rq_data_dir(req) == WRITE) {
3012                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3013                 itcw_op = ITCW_OP_WRITE;
3014         } else
3015                 return ERR_PTR(-EINVAL);
3016
3017         /* trackbased I/O needs address all memory via TIDAWs,
3018          * not just for 64 bit addresses. This allows us to map
3019          * each segment directly to one tidaw.
3020          * In the case of write requests, additional tidaws may
3021          * be needed when a segment crosses a track boundary.
3022          */
3023         trkcount = last_trk - first_trk + 1;
3024         ctidaw = 0;
3025         rq_for_each_segment(bv, req, iter) {
3026                 ++ctidaw;
3027         }
3028         if (rq_data_dir(req) == WRITE)
3029                 ctidaw += (last_trk - first_trk);
3030
3031         /* Allocate the ccw request. */
3032         itcw_size = itcw_calc_size(0, ctidaw, 0);
3033         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
3034         if (IS_ERR(cqr))
3035                 return cqr;
3036
3037         /* transfer length factor: how many bytes to read from the last track */
3038         if (first_trk == last_trk)
3039                 tlf = last_offs - first_offs + 1;
3040         else
3041                 tlf = last_offs + 1;
3042         tlf *= blksize;
3043
3044         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
3045         if (IS_ERR(itcw)) {
3046                 ret = -EINVAL;
3047                 goto out_error;
3048         }
3049         cqr->cpaddr = itcw_get_tcw(itcw);
3050         if (prepare_itcw(itcw, first_trk, last_trk,
3051                          cmd, basedev, startdev,
3052                          first_offs + 1,
3053                          trkcount, blksize,
3054                          (last_rec - first_rec + 1) * blksize,
3055                          tlf, blk_per_trk) == -EAGAIN) {
3056                 /* Clock not in sync and XRC is enabled.
3057                  * Try again later.
3058                  */
3059                 ret = -EAGAIN;
3060                 goto out_error;
3061         }
3062         len_to_track_end = 0;
3063         /*
3064          * A tidaw can address 4k of memory, but must not cross page boundaries
3065          * We can let the block layer handle this by setting
3066          * blk_queue_segment_boundary to page boundaries and
3067          * blk_max_segment_size to page size when setting up the request queue.
3068          * For write requests, a TIDAW must not cross track boundaries, because
3069          * we have to set the CBC flag on the last tidaw for each track.
3070          */
3071         if (rq_data_dir(req) == WRITE) {
3072                 new_track = 1;
3073                 recid = first_rec;
3074                 rq_for_each_segment(bv, req, iter) {
3075                         dst = page_address(bv->bv_page) + bv->bv_offset;
3076                         seg_len = bv->bv_len;
3077                         while (seg_len) {
3078                                 if (new_track) {
3079                                         trkid = recid;
3080                                         offs = sector_div(trkid, blk_per_trk);
3081                                         count_to_trk_end = blk_per_trk - offs;
3082                                         count = min((last_rec - recid + 1),
3083                                                     (sector_t)count_to_trk_end);
3084                                         len_to_track_end = count * blksize;
3085                                         recid += count;
3086                                         new_track = 0;
3087                                 }
3088                                 part_len = min(seg_len, len_to_track_end);
3089                                 seg_len -= part_len;
3090                                 len_to_track_end -= part_len;
3091                                 /* We need to end the tidaw at track end */
3092                                 if (!len_to_track_end) {
3093                                         new_track = 1;
3094                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
3095                                 } else
3096                                         tidaw_flags = 0;
3097                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
3098                                                             dst, part_len);
3099                                 if (IS_ERR(last_tidaw)) {
3100                                         ret = -EINVAL;
3101                                         goto out_error;
3102                                 }
3103                                 dst += part_len;
3104                         }
3105                 }
3106         } else {
3107                 rq_for_each_segment(bv, req, iter) {
3108                         dst = page_address(bv->bv_page) + bv->bv_offset;
3109                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
3110                                                     dst, bv->bv_len);
3111                         if (IS_ERR(last_tidaw)) {
3112                                 ret = -EINVAL;
3113                                 goto out_error;
3114                         }
3115                 }
3116         }
3117         last_tidaw->flags |= TIDAW_FLAGS_LAST;
3118         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
3119         itcw_finalize(itcw);
3120
3121         if (blk_noretry_request(req) ||
3122             block->base->features & DASD_FEATURE_FAILFAST)
3123                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3124         cqr->cpmode = 1;
3125         cqr->startdev = startdev;
3126         cqr->memdev = startdev;
3127         cqr->block = block;
3128         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3129         cqr->lpm = startdev->path_data.ppm;
3130         cqr->retries = 256;
3131         cqr->buildclk = get_tod_clock();
3132         cqr->status = DASD_CQR_FILLED;
3133         return cqr;
3134 out_error:
3135         dasd_sfree_request(cqr, startdev);
3136         return ERR_PTR(ret);
3137 }
3138
3139 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3140                                                struct dasd_block *block,
3141                                                struct request *req)
3142 {
3143         int cmdrtd, cmdwtd;
3144         int use_prefix;
3145         int fcx_multitrack;
3146         struct dasd_eckd_private *private;
3147         struct dasd_device *basedev;
3148         sector_t first_rec, last_rec;
3149         sector_t first_trk, last_trk;
3150         unsigned int first_offs, last_offs;
3151         unsigned int blk_per_trk, blksize;
3152         int cdlspecial;
3153         unsigned int data_size;
3154         struct dasd_ccw_req *cqr;
3155
3156         basedev = block->base;
3157         private = (struct dasd_eckd_private *) basedev->private;
3158
3159         /* Calculate number of blocks/records per track. */
3160         blksize = block->bp_block;
3161         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3162         if (blk_per_trk == 0)
3163                 return ERR_PTR(-EINVAL);
3164         /* Calculate record id of first and last block. */
3165         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3166         first_offs = sector_div(first_trk, blk_per_trk);
3167         last_rec = last_trk =
3168                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3169         last_offs = sector_div(last_trk, blk_per_trk);
3170         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3171
3172         fcx_multitrack = private->features.feature[40] & 0x20;
3173         data_size = blk_rq_bytes(req);
3174         /* tpm write request add CBC data on each track boundary */
3175         if (rq_data_dir(req) == WRITE)
3176                 data_size += (last_trk - first_trk) * 4;
3177
3178         /* is read track data and write track data in command mode supported? */
3179         cmdrtd = private->features.feature[9] & 0x20;
3180         cmdwtd = private->features.feature[12] & 0x40;
3181         use_prefix = private->features.feature[8] & 0x01;
3182
3183         cqr = NULL;
3184         if (cdlspecial || dasd_page_cache) {
3185                 /* do nothing, just fall through to the cmd mode single case */
3186         } else if ((data_size <= private->fcx_max_data)
3187                    && (fcx_multitrack || (first_trk == last_trk))) {
3188                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3189                                                     first_rec, last_rec,
3190                                                     first_trk, last_trk,
3191                                                     first_offs, last_offs,
3192                                                     blk_per_trk, blksize);
3193                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3194                     (PTR_ERR(cqr) != -ENOMEM))
3195                         cqr = NULL;
3196         } else if (use_prefix &&
3197                    (((rq_data_dir(req) == READ) && cmdrtd) ||
3198                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3199                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3200                                                    first_rec, last_rec,
3201                                                    first_trk, last_trk,
3202                                                    first_offs, last_offs,
3203                                                    blk_per_trk, blksize);
3204                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3205                     (PTR_ERR(cqr) != -ENOMEM))
3206                         cqr = NULL;
3207         }
3208         if (!cqr)
3209                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3210                                                     first_rec, last_rec,
3211                                                     first_trk, last_trk,
3212                                                     first_offs, last_offs,
3213                                                     blk_per_trk, blksize);
3214         return cqr;
3215 }
3216
3217 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
3218                                                struct dasd_block *block,
3219                                                struct request *req)
3220 {
3221         unsigned long *idaws;
3222         struct dasd_device *basedev;
3223         struct dasd_ccw_req *cqr;
3224         struct ccw1 *ccw;
3225         struct req_iterator iter;
3226         struct bio_vec *bv;
3227         char *dst;
3228         unsigned char cmd;
3229         unsigned int trkcount;
3230         unsigned int seg_len, len_to_track_end;
3231         unsigned int first_offs;
3232         unsigned int cidaw, cplength, datasize;
3233         sector_t first_trk, last_trk;
3234         unsigned int pfx_datasize;
3235
3236         /*
3237          * raw track access needs to be mutiple of 64k and on 64k boundary
3238          */
3239         if ((blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK) != 0) {
3240                 cqr = ERR_PTR(-EINVAL);
3241                 goto out;
3242         }
3243         if (((blk_rq_pos(req) + blk_rq_sectors(req)) %
3244              DASD_RAW_SECTORS_PER_TRACK) != 0) {
3245                 cqr = ERR_PTR(-EINVAL);
3246                 goto out;
3247         }
3248
3249         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3250         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3251                 DASD_RAW_SECTORS_PER_TRACK;
3252         trkcount = last_trk - first_trk + 1;
3253         first_offs = 0;
3254         basedev = block->base;
3255
3256         if (rq_data_dir(req) == READ)
3257                 cmd = DASD_ECKD_CCW_READ_TRACK;
3258         else if (rq_data_dir(req) == WRITE)
3259                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3260         else {
3261                 cqr = ERR_PTR(-EINVAL);
3262                 goto out;
3263         }
3264
3265         /*
3266          * Raw track based I/O needs IDAWs for each page,
3267          * and not just for 64 bit addresses.
3268          */
3269         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3270
3271         /* 1x prefix + one read/write ccw per track */
3272         cplength = 1 + trkcount;
3273
3274         /*
3275          * struct PFX_eckd_data has up to 2 byte as extended parameter
3276          * this is needed for write full track and has to be mentioned
3277          * separately
3278          * add 8 instead of 2 to keep 8 byte boundary
3279          */
3280         pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
3281
3282         datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
3283
3284         /* Allocate the ccw request. */
3285         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3286                                    datasize, startdev);
3287         if (IS_ERR(cqr))
3288                 goto out;
3289         ccw = cqr->cpaddr;
3290
3291         if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
3292                        basedev, startdev, 1 /* format */, first_offs + 1,
3293                        trkcount, 0, 0) == -EAGAIN) {
3294                 /* Clock not in sync and XRC is enabled.
3295                  * Try again later.
3296                  */
3297                 dasd_sfree_request(cqr, startdev);
3298                 cqr = ERR_PTR(-EAGAIN);
3299                 goto out;
3300         }
3301
3302         idaws = (unsigned long *)(cqr->data + pfx_datasize);
3303
3304         len_to_track_end = 0;
3305
3306         rq_for_each_segment(bv, req, iter) {
3307                 dst = page_address(bv->bv_page) + bv->bv_offset;
3308                 seg_len = bv->bv_len;
3309                 if (!len_to_track_end) {
3310                         ccw[-1].flags |= CCW_FLAG_CC;
3311                         ccw->cmd_code = cmd;
3312                         /* maximum 3390 track size */
3313                         ccw->count = 57326;
3314                         /* 64k map to one track */
3315                         len_to_track_end = 65536;
3316                         ccw->cda = (__u32)(addr_t)idaws;
3317                         ccw->flags |= CCW_FLAG_IDA;
3318                         ccw->flags |= CCW_FLAG_SLI;
3319                         ccw++;
3320                 }
3321                 len_to_track_end -= seg_len;
3322                 idaws = idal_create_words(idaws, dst, seg_len);
3323         }
3324
3325         if (blk_noretry_request(req) ||
3326             block->base->features & DASD_FEATURE_FAILFAST)
3327                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3328         cqr->startdev = startdev;
3329         cqr->memdev = startdev;
3330         cqr->block = block;
3331         cqr->expires = startdev->default_expires * HZ;
3332         cqr->lpm = startdev->path_data.ppm;
3333         cqr->retries = 256;
3334         cqr->buildclk = get_tod_clock();
3335         cqr->status = DASD_CQR_FILLED;
3336
3337         if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
3338                 cqr = NULL;
3339 out:
3340         return cqr;
3341 }
3342
3343
3344 static int
3345 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3346 {
3347         struct dasd_eckd_private *private;
3348         struct ccw1 *ccw;
3349         struct req_iterator iter;
3350         struct bio_vec *bv;
3351         char *dst, *cda;
3352         unsigned int blksize, blk_per_trk, off;
3353         sector_t recid;
3354         int status;
3355
3356         if (!dasd_page_cache)
3357                 goto out;
3358         private = (struct dasd_eckd_private *) cqr->block->base->private;
3359         blksize = cqr->block->bp_block;
3360         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3361         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3362         ccw = cqr->cpaddr;
3363         /* Skip over define extent & locate record. */
3364         ccw++;
3365         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3366                 ccw++;
3367         rq_for_each_segment(bv, req, iter) {
3368                 dst = page_address(bv->bv_page) + bv->bv_offset;
3369                 for (off = 0; off < bv->bv_len; off += blksize) {
3370                         /* Skip locate record. */
3371                         if (private->uses_cdl && recid <= 2*blk_per_trk)
3372                                 ccw++;
3373                         if (dst) {
3374                                 if (ccw->flags & CCW_FLAG_IDA)
3375                                         cda = *((char **)((addr_t) ccw->cda));
3376                                 else
3377                                         cda = (char *)((addr_t) ccw->cda);
3378                                 if (dst != cda) {
3379                                         if (rq_data_dir(req) == READ)
3380                                                 memcpy(dst, cda, bv->bv_len);
3381                                         kmem_cache_free(dasd_page_cache,
3382                                             (void *)((addr_t)cda & PAGE_MASK));
3383                                 }
3384                                 dst = NULL;
3385                         }
3386                         ccw++;
3387                         recid++;
3388                 }
3389         }
3390 out:
3391         status = cqr->status == DASD_CQR_DONE;
3392         dasd_sfree_request(cqr, cqr->memdev);
3393         return status;
3394 }
3395
3396 /*
3397  * Modify ccw/tcw in cqr so it can be started on a base device.
3398  *
3399  * Note that this is not enough to restart the cqr!
3400  * Either reset cqr->startdev as well (summary unit check handling)
3401  * or restart via separate cqr (as in ERP handling).
3402  */
3403 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3404 {
3405         struct ccw1 *ccw;
3406         struct PFX_eckd_data *pfxdata;
3407         struct tcw *tcw;
3408         struct tccb *tccb;
3409         struct dcw *dcw;
3410
3411         if (cqr->cpmode == 1) {
3412                 tcw = cqr->cpaddr;
3413                 tccb = tcw_get_tccb(tcw);
3414                 dcw = (struct dcw *)&tccb->tca[0];
3415                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
3416                 pfxdata->validity.verify_base = 0;
3417                 pfxdata->validity.hyper_pav = 0;
3418         } else {
3419                 ccw = cqr->cpaddr;
3420                 pfxdata = cqr->data;
3421                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
3422                         pfxdata->validity.verify_base = 0;
3423                         pfxdata->validity.hyper_pav = 0;
3424                 }
3425         }
3426 }
3427
3428 #define DASD_ECKD_CHANQ_MAX_SIZE 4
3429
3430 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
3431                                                      struct dasd_block *block,
3432                                                      struct request *req)
3433 {
3434         struct dasd_eckd_private *private;
3435         struct dasd_device *startdev;
3436         unsigned long flags;
3437         struct dasd_ccw_req *cqr;
3438
3439         startdev = dasd_alias_get_start_dev(base);
3440         if (!startdev)
3441                 startdev = base;
3442         private = (struct dasd_eckd_private *) startdev->private;
3443         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
3444                 return ERR_PTR(-EBUSY);
3445
3446         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
3447         private->count++;
3448         if ((base->features & DASD_FEATURE_USERAW))
3449                 cqr = dasd_raw_build_cp(startdev, block, req);
3450         else
3451                 cqr = dasd_eckd_build_cp(startdev, block, req);
3452         if (IS_ERR(cqr))
3453                 private->count--;
3454         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
3455         return cqr;
3456 }
3457
3458 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
3459                                    struct request *req)
3460 {
3461         struct dasd_eckd_private *private;
3462         unsigned long flags;
3463
3464         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
3465         private = (struct dasd_eckd_private *) cqr->memdev->private;
3466         private->count--;
3467         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
3468         return dasd_eckd_free_cp(cqr, req);
3469 }
3470
3471 static int
3472 dasd_eckd_fill_info(struct dasd_device * device,
3473                     struct dasd_information2_t * info)
3474 {
3475         struct dasd_eckd_private *private;
3476
3477         private = (struct dasd_eckd_private *) device->private;
3478         info->label_block = 2;
3479         info->FBA_layout = private->uses_cdl ? 0 : 1;
3480         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
3481         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
3482         memcpy(info->characteristics, &private->rdc_data,
3483                sizeof(struct dasd_eckd_characteristics));
3484         info->confdata_size = min((unsigned long)private->conf_len,
3485                                   sizeof(info->configuration_data));
3486         memcpy(info->configuration_data, private->conf_data,
3487                info->confdata_size);
3488         return 0;
3489 }
3490
3491 /*
3492  * SECTION: ioctl functions for eckd devices.
3493  */
3494
3495 /*
3496  * Release device ioctl.
3497  * Buils a channel programm to releases a prior reserved
3498  * (see dasd_eckd_reserve) device.
3499  */
3500 static int
3501 dasd_eckd_release(struct dasd_device *device)
3502 {
3503         struct dasd_ccw_req *cqr;
3504         int rc;
3505         struct ccw1 *ccw;
3506         int useglobal;
3507
3508         if (!capable(CAP_SYS_ADMIN))
3509                 return -EACCES;
3510
3511         useglobal = 0;
3512         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3513         if (IS_ERR(cqr)) {
3514                 mutex_lock(&dasd_reserve_mutex);
3515                 useglobal = 1;
3516                 cqr = &dasd_reserve_req->cqr;
3517                 memset(cqr, 0, sizeof(*cqr));
3518                 memset(&dasd_reserve_req->ccw, 0,
3519                        sizeof(dasd_reserve_req->ccw));
3520                 cqr->cpaddr = &dasd_reserve_req->ccw;
3521                 cqr->data = &dasd_reserve_req->data;
3522                 cqr->magic = DASD_ECKD_MAGIC;
3523         }
3524         ccw = cqr->cpaddr;
3525         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
3526         ccw->flags |= CCW_FLAG_SLI;
3527         ccw->count = 32;
3528         ccw->cda = (__u32)(addr_t) cqr->data;
3529         cqr->startdev = device;
3530         cqr->memdev = device;
3531         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3532         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3533         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3534         cqr->expires = 2 * HZ;
3535         cqr->buildclk = get_tod_clock();
3536         cqr->status = DASD_CQR_FILLED;
3537
3538         rc = dasd_sleep_on_immediatly(cqr);
3539         if (!rc)
3540                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3541
3542         if (useglobal)
3543                 mutex_unlock(&dasd_reserve_mutex);
3544         else
3545                 dasd_sfree_request(cqr, cqr->memdev);
3546         return rc;
3547 }
3548
3549 /*
3550  * Reserve device ioctl.
3551  * Options are set to 'synchronous wait for interrupt' and
3552  * 'timeout the request'. This leads to a terminate IO if
3553  * the interrupt is outstanding for a certain time.
3554  */
3555 static int
3556 dasd_eckd_reserve(struct dasd_device *device)
3557 {
3558         struct dasd_ccw_req *cqr;
3559         int rc;
3560         struct ccw1 *ccw;
3561         int useglobal;
3562
3563         if (!capable(CAP_SYS_ADMIN))
3564                 return -EACCES;
3565
3566         useglobal = 0;
3567         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3568         if (IS_ERR(cqr)) {
3569                 mutex_lock(&dasd_reserve_mutex);
3570                 useglobal = 1;
3571                 cqr = &dasd_reserve_req->cqr;
3572                 memset(cqr, 0, sizeof(*cqr));
3573                 memset(&dasd_reserve_req->ccw, 0,
3574                        sizeof(dasd_reserve_req->ccw));
3575                 cqr->cpaddr = &dasd_reserve_req->ccw;
3576                 cqr->data = &dasd_reserve_req->data;
3577                 cqr->magic = DASD_ECKD_MAGIC;
3578         }
3579         ccw = cqr->cpaddr;
3580         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
3581         ccw->flags |= CCW_FLAG_SLI;
3582         ccw->count = 32;
3583         ccw->cda = (__u32)(addr_t) cqr->data;
3584         cqr->startdev = device;
3585         cqr->memdev = device;
3586         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3587         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3588         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3589         cqr->expires = 2 * HZ;
3590         cqr->buildclk = get_tod_clock();
3591         cqr->status = DASD_CQR_FILLED;
3592
3593         rc = dasd_sleep_on_immediatly(cqr);
3594         if (!rc)
3595                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3596
3597         if (useglobal)
3598                 mutex_unlock(&dasd_reserve_mutex);
3599         else
3600                 dasd_sfree_request(cqr, cqr->memdev);
3601         return rc;
3602 }
3603
3604 /*
3605  * Steal lock ioctl - unconditional reserve device.
3606  * Buils a channel programm to break a device's reservation.
3607  * (unconditional reserve)
3608  */
3609 static int
3610 dasd_eckd_steal_lock(struct dasd_device *device)
3611 {
3612         struct dasd_ccw_req *cqr;
3613         int rc;
3614         struct ccw1 *ccw;
3615         int useglobal;
3616
3617         if (!capable(CAP_SYS_ADMIN))
3618                 return -EACCES;
3619
3620         useglobal = 0;
3621         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3622         if (IS_ERR(cqr)) {
3623                 mutex_lock(&dasd_reserve_mutex);
3624                 useglobal = 1;
3625                 cqr = &dasd_reserve_req->cqr;
3626                 memset(cqr, 0, sizeof(*cqr));
3627                 memset(&dasd_reserve_req->ccw, 0,
3628                        sizeof(dasd_reserve_req->ccw));
3629                 cqr->cpaddr = &dasd_reserve_req->ccw;
3630                 cqr->data = &dasd_reserve_req->data;
3631                 cqr->magic = DASD_ECKD_MAGIC;
3632         }
3633         ccw = cqr->cpaddr;
3634         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
3635         ccw->flags |= CCW_FLAG_SLI;
3636         ccw->count = 32;
3637         ccw->cda = (__u32)(addr_t) cqr->data;
3638         cqr->startdev = device;
3639         cqr->memdev = device;
3640         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3641         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3642         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3643         cqr->expires = 2 * HZ;
3644         cqr->buildclk = get_tod_clock();
3645         cqr->status = DASD_CQR_FILLED;
3646
3647         rc = dasd_sleep_on_immediatly(cqr);
3648         if (!rc)
3649                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3650
3651         if (useglobal)
3652                 mutex_unlock(&dasd_reserve_mutex);
3653         else
3654                 dasd_sfree_request(cqr, cqr->memdev);
3655         return rc;
3656 }
3657
3658 /*
3659  * SNID - Sense Path Group ID
3660  * This ioctl may be used in situations where I/O is stalled due to
3661  * a reserve, so if the normal dasd_smalloc_request fails, we use the
3662  * preallocated dasd_reserve_req.
3663  */
3664 static int dasd_eckd_snid(struct dasd_device *device,
3665                           void __user *argp)
3666 {
3667         struct dasd_ccw_req *cqr;
3668         int rc;
3669         struct ccw1 *ccw;
3670         int useglobal;
3671         struct dasd_snid_ioctl_data usrparm;
3672
3673         if (!capable(CAP_SYS_ADMIN))
3674                 return -EACCES;
3675
3676         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3677                 return -EFAULT;
3678
3679         useglobal = 0;
3680         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
3681                                    sizeof(struct dasd_snid_data), device);
3682         if (IS_ERR(cqr)) {
3683                 mutex_lock(&dasd_reserve_mutex);
3684                 useglobal = 1;
3685                 cqr = &dasd_reserve_req->cqr;
3686                 memset(cqr, 0, sizeof(*cqr));
3687                 memset(&dasd_reserve_req->ccw, 0,
3688                        sizeof(dasd_reserve_req->ccw));
3689                 cqr->cpaddr = &dasd_reserve_req->ccw;
3690                 cqr->data = &dasd_reserve_req->data;
3691                 cqr->magic = DASD_ECKD_MAGIC;
3692         }
3693         ccw = cqr->cpaddr;
3694         ccw->cmd_code = DASD_ECKD_CCW_SNID;
3695         ccw->flags |= CCW_FLAG_SLI;
3696         ccw->count = 12;
3697         ccw->cda = (__u32)(addr_t) cqr->data;
3698         cqr->startdev = device;
3699         cqr->memdev = device;
3700         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3701         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3702         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
3703         cqr->retries = 5;
3704         cqr->expires = 10 * HZ;
3705         cqr->buildclk = get_tod_clock();
3706         cqr->status = DASD_CQR_FILLED;
3707         cqr->lpm = usrparm.path_mask;
3708
3709         rc = dasd_sleep_on_immediatly(cqr);
3710         /* verify that I/O processing didn't modify the path mask */
3711         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
3712                 rc = -EIO;
3713         if (!rc) {
3714                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
3715                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
3716                         rc = -EFAULT;
3717         }
3718
3719         if (useglobal)
3720                 mutex_unlock(&dasd_reserve_mutex);
3721         else
3722                 dasd_sfree_request(cqr, cqr->memdev);
3723         return rc;
3724 }
3725
3726 /*
3727  * Read performance statistics
3728  */
3729 static int
3730 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
3731 {
3732         struct dasd_psf_prssd_data *prssdp;
3733         struct dasd_rssd_perf_stats_t *stats;
3734         struct dasd_ccw_req *cqr;
3735         struct ccw1 *ccw;
3736         int rc;
3737
3738         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
3739                                    (sizeof(struct dasd_psf_prssd_data) +
3740                                     sizeof(struct dasd_rssd_perf_stats_t)),
3741                                    device);
3742         if (IS_ERR(cqr)) {
3743                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3744                             "Could not allocate initialization request");
3745                 return PTR_ERR(cqr);
3746         }
3747         cqr->startdev = device;
3748         cqr->memdev = device;
3749         cqr->retries = 0;
3750         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3751         cqr->expires = 10 * HZ;
3752
3753         /* Prepare for Read Subsystem Data */
3754         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3755         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
3756         prssdp->order = PSF_ORDER_PRSSD;
3757         prssdp->suborder = 0x01;        /* Performance Statistics */
3758         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
3759
3760         ccw = cqr->cpaddr;
3761         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3762         ccw->count = sizeof(struct dasd_psf_prssd_data);
3763         ccw->flags |= CCW_FLAG_CC;
3764         ccw->cda = (__u32)(addr_t) prssdp;
3765
3766         /* Read Subsystem Data - Performance Statistics */
3767         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3768         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
3769
3770         ccw++;
3771         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3772         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
3773         ccw->cda = (__u32)(addr_t) stats;
3774
3775         cqr->buildclk = get_tod_clock();
3776         cqr->status = DASD_CQR_FILLED;
3777         rc = dasd_sleep_on(cqr);
3778         if (rc == 0) {
3779                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3780                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3781                 if (copy_to_user(argp, stats,
3782                                  sizeof(struct dasd_rssd_perf_stats_t)))
3783                         rc = -EFAULT;
3784         }
3785         dasd_sfree_request(cqr, cqr->memdev);
3786         return rc;
3787 }
3788
3789 /*
3790  * Get attributes (cache operations)
3791  * Returnes the cache attributes used in Define Extend (DE).
3792  */
3793 static int
3794 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
3795 {
3796         struct dasd_eckd_private *private =
3797                 (struct dasd_eckd_private *)device->private;
3798         struct attrib_data_t attrib = private->attrib;
3799         int rc;
3800
3801         if (!capable(CAP_SYS_ADMIN))
3802                 return -EACCES;
3803         if (!argp)
3804                 return -EINVAL;
3805
3806         rc = 0;
3807         if (copy_to_user(argp, (long *) &attrib,
3808                          sizeof(struct attrib_data_t)))
3809                 rc = -EFAULT;
3810
3811         return rc;
3812 }
3813
3814 /*
3815  * Set attributes (cache operations)
3816  * Stores the attributes for cache operation to be used in Define Extend (DE).
3817  */
3818 static int
3819 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
3820 {
3821         struct dasd_eckd_private *private =
3822                 (struct dasd_eckd_private *)device->private;
3823         struct attrib_data_t attrib;
3824
3825         if (!capable(CAP_SYS_ADMIN))
3826                 return -EACCES;
3827         if (!argp)
3828                 return -EINVAL;
3829
3830         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
3831                 return -EFAULT;
3832         private->attrib = attrib;
3833
3834         dev_info(&device->cdev->dev,
3835                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
3836                  private->attrib.operation, private->attrib.nr_cyl);
3837         return 0;
3838 }
3839
3840 /*
3841  * Issue syscall I/O to EMC Symmetrix array.
3842  * CCWs are PSF and RSSD
3843  */
3844 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
3845 {
3846         struct dasd_symmio_parms usrparm;
3847         char *psf_data, *rssd_result;
3848         struct dasd_ccw_req *cqr;
3849         struct ccw1 *ccw;
3850         char psf0, psf1;
3851         int rc;
3852
3853         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
3854                 return -EACCES;
3855         psf0 = psf1 = 0;
3856
3857         /* Copy parms from caller */
3858         rc = -EFAULT;
3859         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3860                 goto out;
3861         if (is_compat_task() || sizeof(long) == 4) {
3862                 /* Make sure pointers are sane even on 31 bit. */
3863                 rc = -EINVAL;
3864                 if ((usrparm.psf_data >> 32) != 0)
3865                         goto out;
3866                 if ((usrparm.rssd_result >> 32) != 0)
3867                         goto out;
3868                 usrparm.psf_data &= 0x7fffffffULL;
3869                 usrparm.rssd_result &= 0x7fffffffULL;
3870         }
3871         /* alloc I/O data area */
3872         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
3873         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
3874         if (!psf_data || !rssd_result) {
3875                 rc = -ENOMEM;
3876                 goto out_free;
3877         }
3878
3879         /* get syscall header from user space */
3880         rc = -EFAULT;
3881         if (copy_from_user(psf_data,
3882                            (void __user *)(unsigned long) usrparm.psf_data,
3883                            usrparm.psf_data_len))
3884                 goto out_free;
3885         psf0 = psf_data[0];
3886         psf1 = psf_data[1];
3887
3888         /* setup CCWs for PSF + RSSD */
3889         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
3890         if (IS_ERR(cqr)) {
3891                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3892                         "Could not allocate initialization request");
3893                 rc = PTR_ERR(cqr);
3894                 goto out_free;
3895         }
3896
3897         cqr->startdev = device;
3898         cqr->memdev = device;
3899         cqr->retries = 3;
3900         cqr->expires = 10 * HZ;
3901         cqr->buildclk = get_tod_clock();
3902         cqr->status = DASD_CQR_FILLED;
3903
3904         /* Build the ccws */
3905         ccw = cqr->cpaddr;
3906
3907         /* PSF ccw */
3908         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3909         ccw->count = usrparm.psf_data_len;
3910         ccw->flags |= CCW_FLAG_CC;
3911         ccw->cda = (__u32)(addr_t) psf_data;
3912
3913         ccw++;
3914
3915         /* RSSD ccw  */
3916         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3917         ccw->count = usrparm.rssd_result_len;
3918         ccw->flags = CCW_FLAG_SLI ;
3919         ccw->cda = (__u32)(addr_t) rssd_result;
3920
3921         rc = dasd_sleep_on(cqr);
3922         if (rc)
3923                 goto out_sfree;
3924
3925         rc = -EFAULT;
3926         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
3927                            rssd_result, usrparm.rssd_result_len))
3928                 goto out_sfree;
3929         rc = 0;
3930
3931 out_sfree:
3932         dasd_sfree_request(cqr, cqr->memdev);
3933 out_free:
3934         kfree(rssd_result);
3935         kfree(psf_data);
3936 out:
3937         DBF_DEV_EVENT(DBF_WARNING, device,
3938                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
3939                       (int) psf0, (int) psf1, rc);
3940         return rc;
3941 }
3942
3943 static int
3944 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
3945 {
3946         struct dasd_device *device = block->base;
3947
3948         switch (cmd) {
3949         case BIODASDGATTR:
3950                 return dasd_eckd_get_attrib(device, argp);
3951         case BIODASDSATTR:
3952                 return dasd_eckd_set_attrib(device, argp);
3953         case BIODASDPSRD:
3954                 return dasd_eckd_performance(device, argp);
3955         case BIODASDRLSE:
3956                 return dasd_eckd_release(device);
3957         case BIODASDRSRV:
3958                 return dasd_eckd_reserve(device);
3959         case BIODASDSLCK:
3960                 return dasd_eckd_steal_lock(device);
3961         case BIODASDSNID:
3962                 return dasd_eckd_snid(device, argp);
3963         case BIODASDSYMMIO:
3964                 return dasd_symm_io(device, argp);
3965         default:
3966                 return -ENOTTY;
3967         }
3968 }
3969
3970 /*
3971  * Dump the range of CCWs into 'page' buffer
3972  * and return number of printed chars.
3973  */
3974 static int
3975 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
3976 {
3977         int len, count;
3978         char *datap;
3979
3980         len = 0;
3981         while (from <= to) {
3982                 len += sprintf(page + len, PRINTK_HEADER
3983                                " CCW %p: %08X %08X DAT:",
3984                                from, ((int *) from)[0], ((int *) from)[1]);
3985
3986                 /* get pointer to data (consider IDALs) */
3987                 if (from->flags & CCW_FLAG_IDA)
3988                         datap = (char *) *((addr_t *) (addr_t) from->cda);
3989                 else
3990                         datap = (char *) ((addr_t) from->cda);
3991
3992                 /* dump data (max 32 bytes) */
3993                 for (count = 0; count < from->count && count < 32; count++) {
3994                         if (count % 8 == 0) len += sprintf(page + len, " ");
3995                         if (count % 4 == 0) len += sprintf(page + len, " ");
3996                         len += sprintf(page + len, "%02x", datap[count]);
3997                 }
3998                 len += sprintf(page + len, "\n");
3999                 from++;
4000         }
4001         return len;
4002 }
4003
4004 static void
4005 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
4006                          char *reason)
4007 {
4008         u64 *sense;
4009         u64 *stat;
4010
4011         sense = (u64 *) dasd_get_sense(irb);
4012         stat = (u64 *) &irb->scsw;
4013         if (sense) {
4014                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
4015                               "%016llx %016llx %016llx %016llx",
4016                               reason, *stat, *((u32 *) (stat + 1)),
4017                               sense[0], sense[1], sense[2], sense[3]);
4018         } else {
4019                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
4020                               reason, *stat, *((u32 *) (stat + 1)),
4021                               "NO VALID SENSE");
4022         }
4023 }
4024
4025 /*
4026  * Print sense data and related channel program.
4027  * Parts are printed because printk buffer is only 1024 bytes.
4028  */
4029 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
4030                                  struct dasd_ccw_req *req, struct irb *irb)
4031 {
4032         char *page;
4033         struct ccw1 *first, *last, *fail, *from, *to;
4034         int len, sl, sct;
4035
4036         page = (char *) get_zeroed_page(GFP_ATOMIC);
4037         if (page == NULL) {
4038                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4039                               "No memory to dump sense data\n");
4040                 return;
4041         }
4042         /* dump the sense data */
4043         len = sprintf(page, PRINTK_HEADER
4044                       " I/O status report for device %s:\n",
4045                       dev_name(&device->cdev->dev));
4046         len += sprintf(page + len, PRINTK_HEADER
4047                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4048                        "CS:%02X RC:%d\n",
4049                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4050                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4051                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4052                        req ? req->intrc : 0);
4053         len += sprintf(page + len, PRINTK_HEADER
4054                        " device %s: Failing CCW: %p\n",
4055                        dev_name(&device->cdev->dev),
4056                        (void *) (addr_t) irb->scsw.cmd.cpa);
4057         if (irb->esw.esw0.erw.cons) {
4058                 for (sl = 0; sl < 4; sl++) {
4059                         len += sprintf(page + len, PRINTK_HEADER
4060                                        " Sense(hex) %2d-%2d:",
4061                                        (8 * sl), ((8 * sl) + 7));
4062
4063                         for (sct = 0; sct < 8; sct++) {
4064                                 len += sprintf(page + len, " %02x",
4065                                                irb->ecw[8 * sl + sct]);
4066                         }
4067                         len += sprintf(page + len, "\n");
4068                 }
4069
4070                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
4071                         /* 24 Byte Sense Data */
4072                         sprintf(page + len, PRINTK_HEADER
4073                                 " 24 Byte: %x MSG %x, "
4074                                 "%s MSGb to SYSOP\n",
4075                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
4076                                 irb->ecw[1] & 0x10 ? "" : "no");
4077                 } else {
4078                         /* 32 Byte Sense Data */
4079                         sprintf(page + len, PRINTK_HEADER
4080                                 " 32 Byte: Format: %x "
4081                                 "Exception class %x\n",
4082                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
4083                 }
4084         } else {
4085                 sprintf(page + len, PRINTK_HEADER
4086                         " SORRY - NO VALID SENSE AVAILABLE\n");
4087         }
4088         printk(KERN_ERR "%s", page);
4089
4090         if (req) {
4091                 /* req == NULL for unsolicited interrupts */
4092                 /* dump the Channel Program (max 140 Bytes per line) */
4093                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
4094                 first = req->cpaddr;
4095                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
4096                 to = min(first + 6, last);
4097                 len = sprintf(page, PRINTK_HEADER
4098                               " Related CP in req: %p\n", req);
4099                 dasd_eckd_dump_ccw_range(first, to, page + len);
4100                 printk(KERN_ERR "%s", page);
4101
4102                 /* print failing CCW area (maximum 4) */
4103                 /* scsw->cda is either valid or zero  */
4104                 len = 0;
4105                 from = ++to;
4106                 fail = (struct ccw1 *)(addr_t)
4107                                 irb->scsw.cmd.cpa; /* failing CCW */
4108                 if (from <  fail - 2) {
4109                         from = fail - 2;     /* there is a gap - print header */
4110                         len += sprintf(page, PRINTK_HEADER "......\n");
4111                 }
4112                 to = min(fail + 1, last);
4113                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
4114
4115                 /* print last CCWs (maximum 2) */
4116                 from = max(from, ++to);
4117                 if (from < last - 1) {
4118                         from = last - 1;     /* there is a gap - print header */
4119                         len += sprintf(page + len, PRINTK_HEADER "......\n");
4120                 }
4121                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
4122                 if (len > 0)
4123                         printk(KERN_ERR "%s", page);
4124         }
4125         free_page((unsigned long) page);
4126 }
4127
4128
4129 /*
4130  * Print sense data from a tcw.
4131  */
4132 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4133                                  struct dasd_ccw_req *req, struct irb *irb)
4134 {
4135         char *page;
4136         int len, sl, sct, residual;
4137         struct tsb *tsb;
4138         u8 *sense, *rcq;
4139
4140         page = (char *) get_zeroed_page(GFP_ATOMIC);
4141         if (page == NULL) {
4142                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4143                             "No memory to dump sense data");
4144                 return;
4145         }
4146         /* dump the sense data */
4147         len = sprintf(page, PRINTK_HEADER
4148                       " I/O status report for device %s:\n",
4149                       dev_name(&device->cdev->dev));
4150         len += sprintf(page + len, PRINTK_HEADER
4151                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4152                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4153                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4154                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4155                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4156                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
4157                        req ? req->intrc : 0);
4158         len += sprintf(page + len, PRINTK_HEADER
4159                        " device %s: Failing TCW: %p\n",
4160                        dev_name(&device->cdev->dev),
4161                        (void *) (addr_t) irb->scsw.tm.tcw);
4162
4163         tsb = NULL;
4164         sense = NULL;
4165         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4166                 tsb = tcw_get_tsb(
4167                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4168
4169         if (tsb) {
4170                 len += sprintf(page + len, PRINTK_HEADER
4171                                " tsb->length %d\n", tsb->length);
4172                 len += sprintf(page + len, PRINTK_HEADER
4173                                " tsb->flags %x\n", tsb->flags);
4174                 len += sprintf(page + len, PRINTK_HEADER
4175                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
4176                 len += sprintf(page + len, PRINTK_HEADER
4177                                " tsb->count %d\n", tsb->count);
4178                 residual = tsb->count - 28;
4179                 len += sprintf(page + len, PRINTK_HEADER
4180                                " residual %d\n", residual);
4181
4182                 switch (tsb->flags & 0x07) {
4183                 case 1: /* tsa_iostat */
4184                         len += sprintf(page + len, PRINTK_HEADER
4185                                " tsb->tsa.iostat.dev_time %d\n",
4186                                        tsb->tsa.iostat.dev_time);
4187                         len += sprintf(page + len, PRINTK_HEADER
4188                                " tsb->tsa.iostat.def_time %d\n",
4189                                        tsb->tsa.iostat.def_time);
4190                         len += sprintf(page + len, PRINTK_HEADER
4191                                " tsb->tsa.iostat.queue_time %d\n",
4192                                        tsb->tsa.iostat.queue_time);
4193                         len += sprintf(page + len, PRINTK_HEADER
4194                                " tsb->tsa.iostat.dev_busy_time %d\n",
4195                                        tsb->tsa.iostat.dev_busy_time);
4196                         len += sprintf(page + len, PRINTK_HEADER
4197                                " tsb->tsa.iostat.dev_act_time %d\n",
4198                                        tsb->tsa.iostat.dev_act_time);
4199                         sense = tsb->tsa.iostat.sense;
4200                         break;
4201                 case 2: /* ts_ddpc */
4202                         len += sprintf(page + len, PRINTK_HEADER
4203                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4204                         for (sl = 0; sl < 2; sl++) {
4205                                 len += sprintf(page + len, PRINTK_HEADER
4206                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
4207                                                (8 * sl), ((8 * sl) + 7));
4208                                 rcq = tsb->tsa.ddpc.rcq;
4209                                 for (sct = 0; sct < 8; sct++) {
4210                                         len += sprintf(page + len, " %02x",
4211                                                        rcq[8 * sl + sct]);
4212                                 }
4213                                 len += sprintf(page + len, "\n");
4214                         }
4215                         sense = tsb->tsa.ddpc.sense;
4216                         break;
4217                 case 3: /* tsa_intrg */
4218                         len += sprintf(page + len, PRINTK_HEADER
4219                                       " tsb->tsa.intrg.: not supportet yet\n");
4220                         break;
4221                 }
4222
4223                 if (sense) {
4224                         for (sl = 0; sl < 4; sl++) {
4225                                 len += sprintf(page + len, PRINTK_HEADER
4226                                                " Sense(hex) %2d-%2d:",
4227                                                (8 * sl), ((8 * sl) + 7));
4228                                 for (sct = 0; sct < 8; sct++) {
4229                                         len += sprintf(page + len, " %02x",
4230                                                        sense[8 * sl + sct]);
4231                                 }
4232                                 len += sprintf(page + len, "\n");
4233                         }
4234
4235                         if (sense[27] & DASD_SENSE_BIT_0) {
4236                                 /* 24 Byte Sense Data */
4237                                 sprintf(page + len, PRINTK_HEADER
4238                                         " 24 Byte: %x MSG %x, "
4239                                         "%s MSGb to SYSOP\n",
4240                                         sense[7] >> 4, sense[7] & 0x0f,
4241                                         sense[1] & 0x10 ? "" : "no");
4242                         } else {
4243                                 /* 32 Byte Sense Data */
4244                                 sprintf(page + len, PRINTK_HEADER
4245                                         " 32 Byte: Format: %x "
4246                                         "Exception class %x\n",
4247                                         sense[6] & 0x0f, sense[22] >> 4);
4248                         }
4249                 } else {
4250                         sprintf(page + len, PRINTK_HEADER
4251                                 " SORRY - NO VALID SENSE AVAILABLE\n");
4252                 }
4253         } else {
4254                 sprintf(page + len, PRINTK_HEADER
4255                         " SORRY - NO TSB DATA AVAILABLE\n");
4256         }
4257         printk(KERN_ERR "%s", page);
4258         free_page((unsigned long) page);
4259 }
4260
4261 static void dasd_eckd_dump_sense(struct dasd_device *device,
4262                                  struct dasd_ccw_req *req, struct irb *irb)
4263 {
4264         if (scsw_is_tm(&irb->scsw))
4265                 dasd_eckd_dump_sense_tcw(device, req, irb);
4266         else
4267                 dasd_eckd_dump_sense_ccw(device, req, irb);
4268 }
4269
4270 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4271 {
4272         /*
4273          * the device should be disconnected from our LCU structure
4274          * on restore we will reconnect it and reread LCU specific
4275          * information like PAV support that might have changed
4276          */
4277         dasd_alias_remove_device(device);
4278         dasd_alias_disconnect_device_from_lcu(device);
4279
4280         return 0;
4281 }
4282
4283 static int dasd_eckd_restore_device(struct dasd_device *device)
4284 {
4285         struct dasd_eckd_private *private;
4286         struct dasd_eckd_characteristics temp_rdc_data;
4287         int rc;
4288         struct dasd_uid temp_uid;
4289         unsigned long flags;
4290         unsigned long cqr_flags = 0;
4291
4292         private = (struct dasd_eckd_private *) device->private;
4293
4294         /* Read Configuration Data */
4295         dasd_eckd_read_conf(device);
4296
4297         dasd_eckd_get_uid(device, &temp_uid);
4298         /* Generate device unique id */
4299         rc = dasd_eckd_generate_uid(device);
4300         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4301         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4302                 dev_err(&device->cdev->dev, "The UID of the DASD has "
4303                         "changed\n");
4304         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4305         if (rc)
4306                 goto out_err;
4307
4308         /* register lcu with alias handling, enable PAV if this is a new lcu */
4309         rc = dasd_alias_make_device_known_to_lcu(device);
4310         if (rc)
4311                 return rc;
4312
4313         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
4314         dasd_eckd_validate_server(device, cqr_flags);
4315
4316         /* RE-Read Configuration Data */
4317         dasd_eckd_read_conf(device);
4318
4319         /* Read Feature Codes */
4320         dasd_eckd_read_features(device);
4321
4322         /* Read Device Characteristics */
4323         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4324                                          &temp_rdc_data, 64);
4325         if (rc) {
4326                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4327                                 "Read device characteristic failed, rc=%d", rc);
4328                 goto out_err;
4329         }
4330         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4331         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4332         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4333
4334         /* add device to alias management */
4335         dasd_alias_add_device(device);
4336
4337         return 0;
4338
4339 out_err:
4340         return -1;
4341 }
4342
4343 static int dasd_eckd_reload_device(struct dasd_device *device)
4344 {
4345         struct dasd_eckd_private *private;
4346         int rc, old_base;
4347         char print_uid[60];
4348         struct dasd_uid uid;
4349         unsigned long flags;
4350
4351         private = (struct dasd_eckd_private *) device->private;
4352
4353         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4354         old_base = private->uid.base_unit_addr;
4355         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4356
4357         /* Read Configuration Data */
4358         rc = dasd_eckd_read_conf(device);
4359         if (rc)
4360                 goto out_err;
4361
4362         rc = dasd_eckd_generate_uid(device);
4363         if (rc)
4364                 goto out_err;
4365         /*
4366          * update unit address configuration and
4367          * add device to alias management
4368          */
4369         dasd_alias_update_add_device(device);
4370
4371         dasd_eckd_get_uid(device, &uid);
4372
4373         if (old_base != uid.base_unit_addr) {
4374                 if (strlen(uid.vduit) > 0)
4375                         snprintf(print_uid, sizeof(print_uid),
4376                                  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
4377                                  uid.ssid, uid.base_unit_addr, uid.vduit);
4378                 else
4379                         snprintf(print_uid, sizeof(print_uid),
4380                                  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
4381                                  uid.ssid, uid.base_unit_addr);
4382
4383                 dev_info(&device->cdev->dev,
4384                          "An Alias device was reassigned to a new base device "
4385                          "with UID: %s\n", print_uid);
4386         }
4387         return 0;
4388
4389 out_err:
4390         return -1;
4391 }
4392
4393 static struct ccw_driver dasd_eckd_driver = {
4394         .driver = {
4395                 .name   = "dasd-eckd",
4396                 .owner  = THIS_MODULE,
4397         },
4398         .ids         = dasd_eckd_ids,
4399         .probe       = dasd_eckd_probe,
4400         .remove      = dasd_generic_remove,
4401         .set_offline = dasd_generic_set_offline,
4402         .set_online  = dasd_eckd_set_online,
4403         .notify      = dasd_generic_notify,
4404         .path_event  = dasd_generic_path_event,
4405         .shutdown    = dasd_generic_shutdown,
4406         .freeze      = dasd_generic_pm_freeze,
4407         .thaw        = dasd_generic_restore_device,
4408         .restore     = dasd_generic_restore_device,
4409         .uc_handler  = dasd_generic_uc_handler,
4410         .int_class   = IRQIO_DAS,
4411 };
4412
4413 /*
4414  * max_blocks is dependent on the amount of storage that is available
4415  * in the static io buffer for each device. Currently each device has
4416  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
4417  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
4418  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
4419  * addition we have one define extent ccw + 16 bytes of data and one
4420  * locate record ccw + 16 bytes of data. That makes:
4421  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
4422  * We want to fit two into the available memory so that we can immediately
4423  * start the next request if one finishes off. That makes 249.5 blocks
4424  * for one request. Give a little safety and the result is 240.
4425  */
4426 static struct dasd_discipline dasd_eckd_discipline = {
4427         .owner = THIS_MODULE,
4428         .name = "ECKD",
4429         .ebcname = "ECKD",
4430         .max_blocks = 190,
4431         .check_device = dasd_eckd_check_characteristics,
4432         .uncheck_device = dasd_eckd_uncheck_device,
4433         .do_analysis = dasd_eckd_do_analysis,
4434         .verify_path = dasd_eckd_verify_path,
4435         .basic_to_ready = dasd_eckd_basic_to_ready,
4436         .online_to_ready = dasd_eckd_online_to_ready,
4437         .ready_to_basic = dasd_eckd_ready_to_basic,
4438         .fill_geometry = dasd_eckd_fill_geometry,
4439         .start_IO = dasd_start_IO,
4440         .term_IO = dasd_term_IO,
4441         .handle_terminated_request = dasd_eckd_handle_terminated_request,
4442         .format_device = dasd_eckd_format_device,
4443         .erp_action = dasd_eckd_erp_action,
4444         .erp_postaction = dasd_eckd_erp_postaction,
4445         .check_for_device_change = dasd_eckd_check_for_device_change,
4446         .build_cp = dasd_eckd_build_alias_cp,
4447         .free_cp = dasd_eckd_free_alias_cp,
4448         .dump_sense = dasd_eckd_dump_sense,
4449         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
4450         .fill_info = dasd_eckd_fill_info,
4451         .ioctl = dasd_eckd_ioctl,
4452         .freeze = dasd_eckd_pm_freeze,
4453         .restore = dasd_eckd_restore_device,
4454         .reload = dasd_eckd_reload_device,
4455         .get_uid = dasd_eckd_get_uid,
4456         .kick_validate = dasd_eckd_kick_validate_server,
4457 };
4458
4459 static int __init
4460 dasd_eckd_init(void)
4461 {
4462         int ret;
4463
4464         ASCEBC(dasd_eckd_discipline.ebcname, 4);
4465         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
4466                                    GFP_KERNEL | GFP_DMA);
4467         if (!dasd_reserve_req)
4468                 return -ENOMEM;
4469         path_verification_worker = kmalloc(sizeof(*path_verification_worker),
4470                                    GFP_KERNEL | GFP_DMA);
4471         if (!path_verification_worker) {
4472                 kfree(dasd_reserve_req);
4473                 return -ENOMEM;
4474         }
4475         ret = ccw_driver_register(&dasd_eckd_driver);
4476         if (!ret)
4477                 wait_for_device_probe();
4478         else {
4479                 kfree(path_verification_worker);
4480                 kfree(dasd_reserve_req);
4481         }
4482         return ret;
4483 }
4484
4485 static void __exit
4486 dasd_eckd_cleanup(void)
4487 {
4488         ccw_driver_unregister(&dasd_eckd_driver);
4489         kfree(path_verification_worker);
4490         kfree(dasd_reserve_req);
4491 }
4492
4493 module_init(dasd_eckd_init);
4494 module_exit(dasd_eckd_cleanup);