drivers/s390/block/dasd_eckd.c

   1 /*
   2  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   3  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   4  *                  Carsten Otte <Cotte@de.ibm.com>
   5  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   6  * Bugreports.to..: <Linux390@de.ibm.com>
   7  * Copyright IBM Corp. 1999, 2009
   8  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
   9  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
  10  */
  11
  12 #define KMSG_COMPONENT "dasd-eckd"
  13
  14 #include <linux/stddef.h>
  15 #include <linux/kernel.h>
  16 #include <linux/slab.h>
  17 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  18 #include <linux/bio.h>
  19 #include <linux/module.h>
  20 #include <linux/compat.h>
  21 #include <linux/init.h>
  22
  23 #include <asm/css_chars.h>
  24 #include <asm/debug.h>
  25 #include <asm/idals.h>
  26 #include <asm/ebcdic.h>
  27 #include <asm/io.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/cio.h>
  30 #include <asm/ccwdev.h>
  31 #include <asm/itcw.h>
  32
  33 #include "dasd_int.h"
  34 #include "dasd_eckd.h"
  35
  36 #ifdef PRINTK_HEADER
  37 #undef PRINTK_HEADER
  38 #endif                          /* PRINTK_HEADER */
  39 #define PRINTK_HEADER "dasd(eckd):"
  40
  41 #define ECKD_C0(i) (i->home_bytes)
  42 #define ECKD_F(i) (i->formula)
  43 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
  44                     (i->factors.f_0x02.f1))
  45 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
  46                     (i->factors.f_0x02.f2))
  47 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
  48                     (i->factors.f_0x02.f3))
  49 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
  50 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
  51 #define ECKD_F6(i) (i->factor6)
  52 #define ECKD_F7(i) (i->factor7)
  53 #define ECKD_F8(i) (i->factor8)
  54
  55 /*
  56  * raw track access always map to 64k in memory
  57  * so it maps to 16 blocks of 4k per track
  58  */
  59 #define DASD_RAW_BLOCK_PER_TRACK 16
  60 #define DASD_RAW_BLOCKSIZE 4096
  61 /* 64k are 128 x 512 byte sectors  */
  62 #define DASD_RAW_SECTORS_PER_TRACK 128
  63
  64 MODULE_LICENSE("GPL");
  65
  66 static struct dasd_discipline dasd_eckd_discipline;
  67
  68 /* The ccw bus type uses this table to find devices that it sends to
  69  * dasd_eckd_probe */
  70 static struct ccw_device_id dasd_eckd_ids[] = {
  71         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
  72         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
  73         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
  74         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
  75         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
  76         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
  77         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
  78         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
  79         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
  80         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
  81         { /* end of list */ },
  82 };
  83
  84 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  85
  86 static struct ccw_driver dasd_eckd_driver; /* see below */
  87
  88 #define INIT_CQR_OK 0
  89 #define INIT_CQR_UNFORMATTED 1
  90 #define INIT_CQR_ERROR 2
  91
  92 /* emergency request for reserve/release */
  93 static struct {
  94         struct dasd_ccw_req cqr;
  95         struct ccw1 ccw;
  96         char data[32];
  97 } *dasd_reserve_req;
  98 static DEFINE_MUTEX(dasd_reserve_mutex);
  99
 100 /* definitions for the path verification worker */
 101 struct path_verification_work_data {
 102         struct work_struct worker;
 103         struct dasd_device *device;
 104         struct dasd_ccw_req cqr;
 105         struct ccw1 ccw;
 106         __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
 107         int isglobal;
 108         __u8 tbvpm;
 109 };
 110 static struct path_verification_work_data *path_verification_worker;
 111 static DEFINE_MUTEX(dasd_path_verification_mutex);
 112
 113 /* initial attempt at a probe function. this can be simplified once
 114  * the other detection code is gone */
 115 static int
 116 dasd_eckd_probe (struct ccw_device *cdev)
 117 {
 118         int ret;
 119
 120         /* set ECKD specific ccw-device options */
 121         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
 122                                      CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
 123         if (ret) {
 124                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
 125                                 "dasd_eckd_probe: could not set "
 126                                 "ccw-device options");
 127                 return ret;
 128         }
 129         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
 130         return ret;
 131 }
 132
 133 static int
 134 dasd_eckd_set_online(struct ccw_device *cdev)
 135 {
 136         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
 137 }
 138
 139 static const int sizes_trk0[] = { 28, 148, 84 };
 140 #define LABEL_SIZE 140
 141
 142 /* head and record addresses of count_area read in analysis ccw */
 143 static const int count_area_head[] = { 0, 0, 0, 0, 2 };
 144 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
 145
 146 static inline unsigned int
 147 round_up_multiple(unsigned int no, unsigned int mult)
 148 {
 149         int rem = no % mult;
 150         return (rem ? no - rem + mult : no);
 151 }
 152
 153 static inline unsigned int
 154 ceil_quot(unsigned int d1, unsigned int d2)
 155 {
 156         return (d1 + (d2 - 1)) / d2;
 157 }
 158
 159 static unsigned int
 160 recs_per_track(struct dasd_eckd_characteristics * rdc,
 161                unsigned int kl, unsigned int dl)
 162 {
 163         int dn, kn;
 164
 165         switch (rdc->dev_type) {
 166         case 0x3380:
 167                 if (kl)
 168                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 169                                        ceil_quot(dl + 12, 32));
 170                 else
 171                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 172         case 0x3390:
 173                 dn = ceil_quot(dl + 6, 232) + 1;
 174                 if (kl) {
 175                         kn = ceil_quot(kl + 6, 232) + 1;
 176                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 177                                        9 + ceil_quot(dl + 6 * dn, 34));
 178                 } else
 179                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 180         case 0x9345:
 181                 dn = ceil_quot(dl + 6, 232) + 1;
 182                 if (kl) {
 183                         kn = ceil_quot(kl + 6, 232) + 1;
 184                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 185                                        ceil_quot(dl + 6 * dn, 34));
 186                 } else
 187                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 188         }
 189         return 0;
 190 }
 191
 192 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
 193 {
 194         geo->cyl = (__u16) cyl;
 195         geo->head = cyl >> 16;
 196         geo->head <<= 4;
 197         geo->head |= head;
 198 }
 199
 200 static int
 201 check_XRC (struct ccw1         *de_ccw,
 202            struct DE_eckd_data *data,
 203            struct dasd_device  *device)
 204 {
 205         struct dasd_eckd_private *private;
 206         int rc;
 207
 208         private = (struct dasd_eckd_private *) device->private;
 209         if (!private->rdc_data.facilities.XRC_supported)
 210                 return 0;
 211
 212         /* switch on System Time Stamp - needed for XRC Support */
 213         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 214         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 215
 216         rc = get_sync_clock(&data->ep_sys_time);
 217         /* Ignore return code if sync clock is switched off. */
 218         if (rc == -EOPNOTSUPP || rc == -EACCES)
 219                 rc = 0;
 220
 221         de_ccw->count = sizeof(struct DE_eckd_data);
 222         de_ccw->flags |= CCW_FLAG_SLI;
 223         return rc;
 224 }
 225
 226 static int
 227 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
 228               unsigned int totrk, int cmd, struct dasd_device *device)
 229 {
 230         struct dasd_eckd_private *private;
 231         u32 begcyl, endcyl;
 232         u16 heads, beghead, endhead;
 233         int rc = 0;
 234
 235         private = (struct dasd_eckd_private *) device->private;
 236
 237         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 238         ccw->flags = 0;
 239         ccw->count = 16;
 240         ccw->cda = (__u32) __pa(data);
 241
 242         memset(data, 0, sizeof(struct DE_eckd_data));
 243         switch (cmd) {
 244         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 245         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 246         case DASD_ECKD_CCW_READ:
 247         case DASD_ECKD_CCW_READ_MT:
 248         case DASD_ECKD_CCW_READ_CKD:
 249         case DASD_ECKD_CCW_READ_CKD_MT:
 250         case DASD_ECKD_CCW_READ_KD:
 251         case DASD_ECKD_CCW_READ_KD_MT:
 252         case DASD_ECKD_CCW_READ_COUNT:
 253                 data->mask.perm = 0x1;
 254                 data->attributes.operation = private->attrib.operation;
 255                 break;
 256         case DASD_ECKD_CCW_WRITE:
 257         case DASD_ECKD_CCW_WRITE_MT:
 258         case DASD_ECKD_CCW_WRITE_KD:
 259         case DASD_ECKD_CCW_WRITE_KD_MT:
 260                 data->mask.perm = 0x02;
 261                 data->attributes.operation = private->attrib.operation;
 262                 rc = check_XRC (ccw, data, device);
 263                 break;
 264         case DASD_ECKD_CCW_WRITE_CKD:
 265         case DASD_ECKD_CCW_WRITE_CKD_MT:
 266                 data->attributes.operation = DASD_BYPASS_CACHE;
 267                 rc = check_XRC (ccw, data, device);
 268                 break;
 269         case DASD_ECKD_CCW_ERASE:
 270         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 271         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 272                 data->mask.perm = 0x3;
 273                 data->mask.auth = 0x1;
 274                 data->attributes.operation = DASD_BYPASS_CACHE;
 275                 rc = check_XRC (ccw, data, device);
 276                 break;
 277         default:
 278                 dev_err(&device->cdev->dev,
 279                         "0x%x is not a known command\n", cmd);
 280                 break;
 281         }
 282
 283         data->attributes.mode = 0x3;    /* ECKD */
 284
 285         if ((private->rdc_data.cu_type == 0x2105 ||
 286              private->rdc_data.cu_type == 0x2107 ||
 287              private->rdc_data.cu_type == 0x1750)
 288             && !(private->uses_cdl && trk < 2))
 289                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 290
 291         heads = private->rdc_data.trk_per_cyl;
 292         begcyl = trk / heads;
 293         beghead = trk % heads;
 294         endcyl = totrk / heads;
 295         endhead = totrk % heads;
 296
 297         /* check for sequential prestage - enhance cylinder range */
 298         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 299             data->attributes.operation == DASD_SEQ_ACCESS) {
 300
 301                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
 302                         endcyl += private->attrib.nr_cyl;
 303                 else
 304                         endcyl = (private->real_cyl - 1);
 305         }
 306
 307         set_ch_t(&data->beg_ext, begcyl, beghead);
 308         set_ch_t(&data->end_ext, endcyl, endhead);
 309         return rc;
 310 }
 311
 312 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
 313                                struct dasd_device  *device)
 314 {
 315         struct dasd_eckd_private *private;
 316         int rc;
 317
 318         private = (struct dasd_eckd_private *) device->private;
 319         if (!private->rdc_data.facilities.XRC_supported)
 320                 return 0;
 321
 322         /* switch on System Time Stamp - needed for XRC Support */
 323         pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid'   */
 324         pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
 325         pfxdata->validity.time_stamp = 1;           /* 'Time Stamp Valid'   */
 326
 327         rc = get_sync_clock(&pfxdata->define_extent.ep_sys_time);
 328         /* Ignore return code if sync clock is switched off. */
 329         if (rc == -EOPNOTSUPP || rc == -EACCES)
 330                 rc = 0;
 331         return rc;
 332 }
 333
 334 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
 335                           unsigned int rec_on_trk, int count, int cmd,
 336                           struct dasd_device *device, unsigned int reclen,
 337                           unsigned int tlf)
 338 {
 339         struct dasd_eckd_private *private;
 340         int sector;
 341         int dn, d;
 342
 343         private = (struct dasd_eckd_private *) device->private;
 344
 345         memset(data, 0, sizeof(*data));
 346         sector = 0;
 347         if (rec_on_trk) {
 348                 switch (private->rdc_data.dev_type) {
 349                 case 0x3390:
 350                         dn = ceil_quot(reclen + 6, 232);
 351                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 352                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 353                         break;
 354                 case 0x3380:
 355                         d = 7 + ceil_quot(reclen + 12, 32);
 356                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 357                         break;
 358                 }
 359         }
 360         data->sector = sector;
 361         /* note: meaning of count depends on the operation
 362          *       for record based I/O it's the number of records, but for
 363          *       track based I/O it's the number of tracks
 364          */
 365         data->count = count;
 366         switch (cmd) {
 367         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 368                 data->operation.orientation = 0x3;
 369                 data->operation.operation = 0x03;
 370                 break;
 371         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 372                 data->operation.orientation = 0x3;
 373                 data->operation.operation = 0x16;
 374                 break;
 375         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 376                 data->operation.orientation = 0x1;
 377                 data->operation.operation = 0x03;
 378                 data->count++;
 379                 break;
 380         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 381                 data->operation.orientation = 0x3;
 382                 data->operation.operation = 0x16;
 383                 data->count++;
 384                 break;
 385         case DASD_ECKD_CCW_WRITE:
 386         case DASD_ECKD_CCW_WRITE_MT:
 387         case DASD_ECKD_CCW_WRITE_KD:
 388         case DASD_ECKD_CCW_WRITE_KD_MT:
 389                 data->auxiliary.length_valid = 0x1;
 390                 data->length = reclen;
 391                 data->operation.operation = 0x01;
 392                 break;
 393         case DASD_ECKD_CCW_WRITE_CKD:
 394         case DASD_ECKD_CCW_WRITE_CKD_MT:
 395                 data->auxiliary.length_valid = 0x1;
 396                 data->length = reclen;
 397                 data->operation.operation = 0x03;
 398                 break;
 399         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 400                 data->operation.orientation = 0x0;
 401                 data->operation.operation = 0x3F;
 402                 data->extended_operation = 0x11;
 403                 data->length = 0;
 404                 data->extended_parameter_length = 0x02;
 405                 if (data->count > 8) {
 406                         data->extended_parameter[0] = 0xFF;
 407                         data->extended_parameter[1] = 0xFF;
 408                         data->extended_parameter[1] <<= (16 - count);
 409                 } else {
 410                         data->extended_parameter[0] = 0xFF;
 411                         data->extended_parameter[0] <<= (8 - count);
 412                         data->extended_parameter[1] = 0x00;
 413                 }
 414                 data->sector = 0xFF;
 415                 break;
 416         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 417                 data->auxiliary.length_valid = 0x1;
 418                 data->length = reclen;  /* not tlf, as one might think */
 419                 data->operation.operation = 0x3F;
 420                 data->extended_operation = 0x23;
 421                 break;
 422         case DASD_ECKD_CCW_READ:
 423         case DASD_ECKD_CCW_READ_MT:
 424         case DASD_ECKD_CCW_READ_KD:
 425         case DASD_ECKD_CCW_READ_KD_MT:
 426                 data->auxiliary.length_valid = 0x1;
 427                 data->length = reclen;
 428                 data->operation.operation = 0x06;
 429                 break;
 430         case DASD_ECKD_CCW_READ_CKD:
 431         case DASD_ECKD_CCW_READ_CKD_MT:
 432                 data->auxiliary.length_valid = 0x1;
 433                 data->length = reclen;
 434                 data->operation.operation = 0x16;
 435                 break;
 436         case DASD_ECKD_CCW_READ_COUNT:
 437                 data->operation.operation = 0x06;
 438                 break;
 439         case DASD_ECKD_CCW_READ_TRACK:
 440                 data->operation.orientation = 0x1;
 441                 data->operation.operation = 0x0C;
 442                 data->extended_parameter_length = 0;
 443                 data->sector = 0xFF;
 444                 break;
 445         case DASD_ECKD_CCW_READ_TRACK_DATA:
 446                 data->auxiliary.length_valid = 0x1;
 447                 data->length = tlf;
 448                 data->operation.operation = 0x0C;
 449                 break;
 450         case DASD_ECKD_CCW_ERASE:
 451                 data->length = reclen;
 452                 data->auxiliary.length_valid = 0x1;
 453                 data->operation.operation = 0x0b;
 454                 break;
 455         default:
 456                 DBF_DEV_EVENT(DBF_ERR, device,
 457                             "fill LRE unknown opcode 0x%x", cmd);
 458                 BUG();
 459         }
 460         set_ch_t(&data->seek_addr,
 461                  trk / private->rdc_data.trk_per_cyl,
 462                  trk % private->rdc_data.trk_per_cyl);
 463         data->search_arg.cyl = data->seek_addr.cyl;
 464         data->search_arg.head = data->seek_addr.head;
 465         data->search_arg.record = rec_on_trk;
 466 }
 467
 468 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 469                       unsigned int trk, unsigned int totrk, int cmd,
 470                       struct dasd_device *basedev, struct dasd_device *startdev,
 471                       unsigned char format, unsigned int rec_on_trk, int count,
 472                       unsigned int blksize, unsigned int tlf)
 473 {
 474         struct dasd_eckd_private *basepriv, *startpriv;
 475         struct DE_eckd_data *dedata;
 476         struct LRE_eckd_data *lredata;
 477         u32 begcyl, endcyl;
 478         u16 heads, beghead, endhead;
 479         int rc = 0;
 480
 481         basepriv = (struct dasd_eckd_private *) basedev->private;
 482         startpriv = (struct dasd_eckd_private *) startdev->private;
 483         dedata = &pfxdata->define_extent;
 484         lredata = &pfxdata->locate_record;
 485
 486         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 487         ccw->flags = 0;
 488         if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
 489                 ccw->count = sizeof(*pfxdata) + 2;
 490                 ccw->cda = (__u32) __pa(pfxdata);
 491                 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
 492         } else {
 493                 ccw->count = sizeof(*pfxdata);
 494                 ccw->cda = (__u32) __pa(pfxdata);
 495                 memset(pfxdata, 0, sizeof(*pfxdata));
 496         }
 497
 498         /* prefix data */
 499         if (format > 1) {
 500                 DBF_DEV_EVENT(DBF_ERR, basedev,
 501                               "PFX LRE unknown format 0x%x", format);
 502                 BUG();
 503                 return -EINVAL;
 504         }
 505         pfxdata->format = format;
 506         pfxdata->base_address = basepriv->ned->unit_addr;
 507         pfxdata->base_lss = basepriv->ned->ID;
 508         pfxdata->validity.define_extent = 1;
 509
 510         /* private uid is kept up to date, conf_data may be outdated */
 511         if (startpriv->uid.type != UA_BASE_DEVICE) {
 512                 pfxdata->validity.verify_base = 1;
 513                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
 514                         pfxdata->validity.hyper_pav = 1;
 515         }
 516
 517         /* define extend data (mostly)*/
 518         switch (cmd) {
 519         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 520         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 521         case DASD_ECKD_CCW_READ:
 522         case DASD_ECKD_CCW_READ_MT:
 523         case DASD_ECKD_CCW_READ_CKD:
 524         case DASD_ECKD_CCW_READ_CKD_MT:
 525         case DASD_ECKD_CCW_READ_KD:
 526         case DASD_ECKD_CCW_READ_KD_MT:
 527         case DASD_ECKD_CCW_READ_COUNT:
 528                 dedata->mask.perm = 0x1;
 529                 dedata->attributes.operation = basepriv->attrib.operation;
 530                 break;
 531         case DASD_ECKD_CCW_READ_TRACK:
 532         case DASD_ECKD_CCW_READ_TRACK_DATA:
 533                 dedata->mask.perm = 0x1;
 534                 dedata->attributes.operation = basepriv->attrib.operation;
 535                 dedata->blk_size = 0;
 536                 break;
 537         case DASD_ECKD_CCW_WRITE:
 538         case DASD_ECKD_CCW_WRITE_MT:
 539         case DASD_ECKD_CCW_WRITE_KD:
 540         case DASD_ECKD_CCW_WRITE_KD_MT:
 541                 dedata->mask.perm = 0x02;
 542                 dedata->attributes.operation = basepriv->attrib.operation;
 543                 rc = check_XRC_on_prefix(pfxdata, basedev);
 544                 break;
 545         case DASD_ECKD_CCW_WRITE_CKD:
 546         case DASD_ECKD_CCW_WRITE_CKD_MT:
 547                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 548                 rc = check_XRC_on_prefix(pfxdata, basedev);
 549                 break;
 550         case DASD_ECKD_CCW_ERASE:
 551         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 552         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 553                 dedata->mask.perm = 0x3;
 554                 dedata->mask.auth = 0x1;
 555                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 556                 rc = check_XRC_on_prefix(pfxdata, basedev);
 557                 break;
 558         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 559                 dedata->mask.perm = 0x03;
 560                 dedata->attributes.operation = basepriv->attrib.operation;
 561                 dedata->blk_size = 0;
 562                 break;
 563         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 564                 dedata->mask.perm = 0x02;
 565                 dedata->attributes.operation = basepriv->attrib.operation;
 566                 dedata->blk_size = blksize;
 567                 rc = check_XRC_on_prefix(pfxdata, basedev);
 568                 break;
 569         default:
 570                 DBF_DEV_EVENT(DBF_ERR, basedev,
 571                             "PFX LRE unknown opcode 0x%x", cmd);
 572                 BUG();
 573                 return -EINVAL;
 574         }
 575
 576         dedata->attributes.mode = 0x3;  /* ECKD */
 577
 578         if ((basepriv->rdc_data.cu_type == 0x2105 ||
 579              basepriv->rdc_data.cu_type == 0x2107 ||
 580              basepriv->rdc_data.cu_type == 0x1750)
 581             && !(basepriv->uses_cdl && trk < 2))
 582                 dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
 583
 584         heads = basepriv->rdc_data.trk_per_cyl;
 585         begcyl = trk / heads;
 586         beghead = trk % heads;
 587         endcyl = totrk / heads;
 588         endhead = totrk % heads;
 589
 590         /* check for sequential prestage - enhance cylinder range */
 591         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
 592             dedata->attributes.operation == DASD_SEQ_ACCESS) {
 593
 594                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
 595                         endcyl += basepriv->attrib.nr_cyl;
 596                 else
 597                         endcyl = (basepriv->real_cyl - 1);
 598         }
 599
 600         set_ch_t(&dedata->beg_ext, begcyl, beghead);
 601         set_ch_t(&dedata->end_ext, endcyl, endhead);
 602
 603         if (format == 1) {
 604                 fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
 605                               basedev, blksize, tlf);
 606         }
 607
 608         return rc;
 609 }
 610
 611 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 612                   unsigned int trk, unsigned int totrk, int cmd,
 613                   struct dasd_device *basedev, struct dasd_device *startdev)
 614 {
 615         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
 616                           0, 0, 0, 0, 0);
 617 }
 618
 619 static void
 620 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
 621               unsigned int rec_on_trk, int no_rec, int cmd,
 622               struct dasd_device * device, int reclen)
 623 {
 624         struct dasd_eckd_private *private;
 625         int sector;
 626         int dn, d;
 627
 628         private = (struct dasd_eckd_private *) device->private;
 629
 630         DBF_DEV_EVENT(DBF_INFO, device,
 631                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 632                   trk, rec_on_trk, no_rec, cmd, reclen);
 633
 634         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 635         ccw->flags = 0;
 636         ccw->count = 16;
 637         ccw->cda = (__u32) __pa(data);
 638
 639         memset(data, 0, sizeof(struct LO_eckd_data));
 640         sector = 0;
 641         if (rec_on_trk) {
 642                 switch (private->rdc_data.dev_type) {
 643                 case 0x3390:
 644                         dn = ceil_quot(reclen + 6, 232);
 645                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 646                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 647                         break;
 648                 case 0x3380:
 649                         d = 7 + ceil_quot(reclen + 12, 32);
 650                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 651                         break;
 652                 }
 653         }
 654         data->sector = sector;
 655         data->count = no_rec;
 656         switch (cmd) {
 657         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 658                 data->operation.orientation = 0x3;
 659                 data->operation.operation = 0x03;
 660                 break;
 661         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 662                 data->operation.orientation = 0x3;
 663                 data->operation.operation = 0x16;
 664                 break;
 665         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 666                 data->operation.orientation = 0x1;
 667                 data->operation.operation = 0x03;
 668                 data->count++;
 669                 break;
 670         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 671                 data->operation.orientation = 0x3;
 672                 data->operation.operation = 0x16;
 673                 data->count++;
 674                 break;
 675         case DASD_ECKD_CCW_WRITE:
 676         case DASD_ECKD_CCW_WRITE_MT:
 677         case DASD_ECKD_CCW_WRITE_KD:
 678         case DASD_ECKD_CCW_WRITE_KD_MT:
 679                 data->auxiliary.last_bytes_used = 0x1;
 680                 data->length = reclen;
 681                 data->operation.operation = 0x01;
 682                 break;
 683         case DASD_ECKD_CCW_WRITE_CKD:
 684         case DASD_ECKD_CCW_WRITE_CKD_MT:
 685                 data->auxiliary.last_bytes_used = 0x1;
 686                 data->length = reclen;
 687                 data->operation.operation = 0x03;
 688                 break;
 689         case DASD_ECKD_CCW_READ:
 690         case DASD_ECKD_CCW_READ_MT:
 691         case DASD_ECKD_CCW_READ_KD:
 692         case DASD_ECKD_CCW_READ_KD_MT:
 693                 data->auxiliary.last_bytes_used = 0x1;
 694                 data->length = reclen;
 695                 data->operation.operation = 0x06;
 696                 break;
 697         case DASD_ECKD_CCW_READ_CKD:
 698         case DASD_ECKD_CCW_READ_CKD_MT:
 699                 data->auxiliary.last_bytes_used = 0x1;
 700                 data->length = reclen;
 701                 data->operation.operation = 0x16;
 702                 break;
 703         case DASD_ECKD_CCW_READ_COUNT:
 704                 data->operation.operation = 0x06;
 705                 break;
 706         case DASD_ECKD_CCW_ERASE:
 707                 data->length = reclen;
 708                 data->auxiliary.last_bytes_used = 0x1;
 709                 data->operation.operation = 0x0b;
 710                 break;
 711         default:
 712                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
 713                               "opcode 0x%x", cmd);
 714         }
 715         set_ch_t(&data->seek_addr,
 716                  trk / private->rdc_data.trk_per_cyl,
 717                  trk % private->rdc_data.trk_per_cyl);
 718         data->search_arg.cyl = data->seek_addr.cyl;
 719         data->search_arg.head = data->seek_addr.head;
 720         data->search_arg.record = rec_on_trk;
 721 }
 722
 723 /*
 724  * Returns 1 if the block is one of the special blocks that needs
 725  * to get read/written with the KD variant of the command.
 726  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 727  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 728  * Luckily the KD variants differ only by one bit (0x08) from the
 729  * normal variant. So don't wonder about code like:
 730  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 731  *         ccw->cmd_code |= 0x8;
 732  */
 733 static inline int
 734 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 735 {
 736         if (recid < 3)
 737                 return 1;
 738         if (recid < blk_per_trk)
 739                 return 0;
 740         if (recid < 2 * blk_per_trk)
 741                 return 1;
 742         return 0;
 743 }
 744
 745 /*
 746  * Returns the record size for the special blocks of the cdl format.
 747  * Only returns something useful if dasd_eckd_cdl_special is true
 748  * for the recid.
 749  */
 750 static inline int
 751 dasd_eckd_cdl_reclen(int recid)
 752 {
 753         if (recid < 3)
 754                 return sizes_trk0[recid];
 755         return LABEL_SIZE;
 756 }
 757 /* create unique id from private structure. */
 758 static void create_uid(struct dasd_eckd_private *private)
 759 {
 760         int count;
 761         struct dasd_uid *uid;
 762
 763         uid = &private->uid;
 764         memset(uid, 0, sizeof(struct dasd_uid));
 765         memcpy(uid->vendor, private->ned->HDA_manufacturer,
 766                sizeof(uid->vendor) - 1);
 767         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 768         memcpy(uid->serial, private->ned->HDA_location,
 769                sizeof(uid->serial) - 1);
 770         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 771         uid->ssid = private->gneq->subsystemID;
 772         uid->real_unit_addr = private->ned->unit_addr;
 773         if (private->sneq) {
 774                 uid->type = private->sneq->sua_flags;
 775                 if (uid->type == UA_BASE_PAV_ALIAS)
 776                         uid->base_unit_addr = private->sneq->base_unit_addr;
 777         } else {
 778                 uid->type = UA_BASE_DEVICE;
 779         }
 780         if (private->vdsneq) {
 781                 for (count = 0; count < 16; count++) {
 782                         sprintf(uid->vduit+2*count, "%02x",
 783                                 private->vdsneq->uit[count]);
 784                 }
 785         }
 786 }
 787
 788 /*
 789  * Generate device unique id that specifies the physical device.
 790  */
 791 static int dasd_eckd_generate_uid(struct dasd_device *device)
 792 {
 793         struct dasd_eckd_private *private;
 794         unsigned long flags;
 795
 796         private = (struct dasd_eckd_private *) device->private;
 797         if (!private)
 798                 return -ENODEV;
 799         if (!private->ned || !private->gneq)
 800                 return -ENODEV;
 801         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 802         create_uid(private);
 803         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 804         return 0;
 805 }
 806
 807 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
 808 {
 809         struct dasd_eckd_private *private;
 810         unsigned long flags;
 811
 812         if (device->private) {
 813                 private = (struct dasd_eckd_private *)device->private;
 814                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 815                 *uid = private->uid;
 816                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 817                 return 0;
 818         }
 819         return -EINVAL;
 820 }
 821
 822 /*
 823  * compare device UID with data of a given dasd_eckd_private structure
 824  * return 0 for match
 825  */
 826 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
 827                                       struct dasd_eckd_private *private)
 828 {
 829         struct dasd_uid device_uid;
 830
 831         create_uid(private);
 832         dasd_eckd_get_uid(device, &device_uid);
 833
 834         return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
 835 }
 836
 837 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
 838                                    struct dasd_ccw_req *cqr,
 839                                    __u8 *rcd_buffer,
 840                                    __u8 lpm)
 841 {
 842         struct ccw1 *ccw;
 843         /*
 844          * buffer has to start with EBCDIC "V1.0" to show
 845          * support for virtual device SNEQ
 846          */
 847         rcd_buffer[0] = 0xE5;
 848         rcd_buffer[1] = 0xF1;
 849         rcd_buffer[2] = 0x4B;
 850         rcd_buffer[3] = 0xF0;
 851
 852         ccw = cqr->cpaddr;
 853         ccw->cmd_code = DASD_ECKD_CCW_RCD;
 854         ccw->flags = 0;
 855         ccw->cda = (__u32)(addr_t)rcd_buffer;
 856         ccw->count = DASD_ECKD_RCD_DATA_SIZE;
 857         cqr->magic = DASD_ECKD_MAGIC;
 858
 859         cqr->startdev = device;
 860         cqr->memdev = device;
 861         cqr->block = NULL;
 862         cqr->expires = 10*HZ;
 863         cqr->lpm = lpm;
 864         cqr->retries = 256;
 865         cqr->buildclk = get_clock();
 866         cqr->status = DASD_CQR_FILLED;
 867         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
 868 }
 869
 870 /*
 871  * Wakeup helper for read_conf
 872  * if the cqr is not done and needs some error recovery
 873  * the buffer has to be re-initialized with the EBCDIC "V1.0"
 874  * to show support for virtual device SNEQ
 875  */
 876 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
 877 {
 878         struct ccw1 *ccw;
 879         __u8 *rcd_buffer;
 880
 881         if (cqr->status !=  DASD_CQR_DONE) {
 882                 ccw = cqr->cpaddr;
 883                 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
 884                 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
 885
 886                 rcd_buffer[0] = 0xE5;
 887                 rcd_buffer[1] = 0xF1;
 888                 rcd_buffer[2] = 0x4B;
 889                 rcd_buffer[3] = 0xF0;
 890         }
 891         dasd_wakeup_cb(cqr, data);
 892 }
 893
 894 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
 895                                            struct dasd_ccw_req *cqr,
 896                                            __u8 *rcd_buffer,
 897                                            __u8 lpm)
 898 {
 899         struct ciw *ciw;
 900         int rc;
 901         /*
 902          * sanity check: scan for RCD command in extended SenseID data
 903          * some devices do not support RCD
 904          */
 905         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 906         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
 907                 return -EOPNOTSUPP;
 908
 909         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
 910         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 911         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
 912         cqr->retries = 5;
 913         cqr->callback = read_conf_cb;
 914         rc = dasd_sleep_on_immediatly(cqr);
 915         return rc;
 916 }
 917
 918 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 919                                    void **rcd_buffer,
 920                                    int *rcd_buffer_size, __u8 lpm)
 921 {
 922         struct ciw *ciw;
 923         char *rcd_buf = NULL;
 924         int ret;
 925         struct dasd_ccw_req *cqr;
 926
 927         /*
 928          * sanity check: scan for RCD command in extended SenseID data
 929          * some devices do not support RCD
 930          */
 931         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 932         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
 933                 ret = -EOPNOTSUPP;
 934                 goto out_error;
 935         }
 936         rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
 937         if (!rcd_buf) {
 938                 ret = -ENOMEM;
 939                 goto out_error;
 940         }
 941         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
 942                                    0, /* use rcd_buf as data ara */
 943                                    device);
 944         if (IS_ERR(cqr)) {
 945                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 946                               "Could not allocate RCD request");
 947                 ret = -ENOMEM;
 948                 goto out_error;
 949         }
 950         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
 951         cqr->callback = read_conf_cb;
 952         ret = dasd_sleep_on(cqr);
 953         /*
 954          * on success we update the user input parms
 955          */
 956         dasd_sfree_request(cqr, cqr->memdev);
 957         if (ret)
 958                 goto out_error;
 959
 960         *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
 961         *rcd_buffer = rcd_buf;
 962         return 0;
 963 out_error:
 964         kfree(rcd_buf);
 965         *rcd_buffer = NULL;
 966         *rcd_buffer_size = 0;
 967         return ret;
 968 }
 969
 970 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
 971 {
 972
 973         struct dasd_sneq *sneq;
 974         int i, count;
 975
 976         private->ned = NULL;
 977         private->sneq = NULL;
 978         private->vdsneq = NULL;
 979         private->gneq = NULL;
 980         count = private->conf_len / sizeof(struct dasd_sneq);
 981         sneq = (struct dasd_sneq *)private->conf_data;
 982         for (i = 0; i < count; ++i) {
 983                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 984                         private->sneq = sneq;
 985                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 986                         private->vdsneq = (struct vd_sneq *)sneq;
 987                 else if (sneq->flags.identifier == 2)
 988                         private->gneq = (struct dasd_gneq *)sneq;
 989                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 990                         private->ned = (struct dasd_ned *)sneq;
 991                 sneq++;
 992         }
 993         if (!private->ned || !private->gneq) {
 994                 private->ned = NULL;
 995                 private->sneq = NULL;
 996                 private->vdsneq = NULL;
 997                 private->gneq = NULL;
 998                 return -EINVAL;
 999         }
1000         return 0;
1001
1002 };
1003
1004 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
1005 {
1006         struct dasd_gneq *gneq;
1007         int i, count, found;
1008
1009         count = conf_len / sizeof(*gneq);
1010         gneq = (struct dasd_gneq *)conf_data;
1011         found = 0;
1012         for (i = 0; i < count; ++i) {
1013                 if (gneq->flags.identifier == 2) {
1014                         found = 1;
1015                         break;
1016                 }
1017                 gneq++;
1018         }
1019         if (found)
1020                 return ((char *)gneq)[18] & 0x07;
1021         else
1022                 return 0;
1023 }
1024
1025 static int dasd_eckd_read_conf(struct dasd_device *device)
1026 {
1027         void *conf_data;
1028         int conf_len, conf_data_saved;
1029         int rc;
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         /* get configuration data per operational path */
1041         for (lpm = 0x80; lpm; lpm>>= 1) {
1042                 if (!(lpm & opm))
1043                         continue;
1044                 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1045                                              &conf_len, lpm);
1046                 if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
1047                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1048                                         "Read configuration data returned "
1049                                         "error %d", rc);
1050                         return rc;
1051                 }
1052                 if (conf_data == NULL) {
1053                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1054                                         "No configuration data "
1055                                         "retrieved");
1056                         /* no further analysis possible */
1057                         path_data->opm |= lpm;
1058                         continue;       /* no error */
1059                 }
1060                 /* save first valid configuration data */
1061                 if (!conf_data_saved) {
1062                         kfree(private->conf_data);
1063                         private->conf_data = conf_data;
1064                         private->conf_len = conf_len;
1065                         if (dasd_eckd_identify_conf_parts(private)) {
1066                                 private->conf_data = NULL;
1067                                 private->conf_len = 0;
1068                                 kfree(conf_data);
1069                                 continue;
1070                         }
1071                         /*
1072                          * build device UID that other path data
1073                          * can be compared to it
1074                          */
1075                         dasd_eckd_generate_uid(device);
1076                         conf_data_saved++;
1077                 } else {
1078                         path_private.conf_data = conf_data;
1079                         path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1080                         if (dasd_eckd_identify_conf_parts(
1081                                     &path_private)) {
1082                                 path_private.conf_data = NULL;
1083                                 path_private.conf_len = 0;
1084                                 kfree(conf_data);
1085                                 continue;
1086                         }
1087
1088                         if (dasd_eckd_compare_path_uid(
1089                                     device, &path_private)) {
1090                                 uid = &path_private.uid;
1091                                 if (strlen(uid->vduit) > 0)
1092                                         snprintf(print_path_uid,
1093                                                  sizeof(print_path_uid),
1094                                                  "%s.%s.%04x.%02x.%s",
1095                                                  uid->vendor, uid->serial,
1096                                                  uid->ssid, uid->real_unit_addr,
1097                                                  uid->vduit);
1098                                 else
1099                                         snprintf(print_path_uid,
1100                                                  sizeof(print_path_uid),
1101                                                  "%s.%s.%04x.%02x",
1102                                                  uid->vendor, uid->serial,
1103                                                  uid->ssid,
1104                                                  uid->real_unit_addr);
1105                                 uid = &private->uid;
1106                                 if (strlen(uid->vduit) > 0)
1107                                         snprintf(print_device_uid,
1108                                                  sizeof(print_device_uid),
1109                                                  "%s.%s.%04x.%02x.%s",
1110                                                  uid->vendor, uid->serial,
1111                                                  uid->ssid, uid->real_unit_addr,
1112                                                  uid->vduit);
1113                                 else
1114                                         snprintf(print_device_uid,
1115                                                  sizeof(print_device_uid),
1116                                                  "%s.%s.%04x.%02x",
1117                                                  uid->vendor, uid->serial,
1118                                                  uid->ssid,
1119                                                  uid->real_unit_addr);
1120                                 dev_err(&device->cdev->dev,
1121                                         "Not all channel paths lead to "
1122                                         "the same device, path %02X leads to "
1123                                         "device %s instead of %s\n", lpm,
1124                                         print_path_uid, print_device_uid);
1125                                 return -EINVAL;
1126                         }
1127
1128                         path_private.conf_data = NULL;
1129                         path_private.conf_len = 0;
1130                 }
1131                 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1132                 case 0x02:
1133                         path_data->npm |= lpm;
1134                         break;
1135                 case 0x03:
1136                         path_data->ppm |= lpm;
1137                         break;
1138                 }
1139                 path_data->opm |= lpm;
1140
1141                 if (conf_data != private->conf_data)
1142                         kfree(conf_data);
1143         }
1144
1145         return 0;
1146 }
1147
1148 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1149 {
1150         struct dasd_eckd_private *private;
1151         int mdc;
1152         u32 fcx_max_data;
1153
1154         private = (struct dasd_eckd_private *) device->private;
1155         if (private->fcx_max_data) {
1156                 mdc = ccw_device_get_mdc(device->cdev, lpm);
1157                 if ((mdc < 0)) {
1158                         dev_warn(&device->cdev->dev,
1159                                  "Detecting the maximum data size for zHPF "
1160                                  "requests failed (rc=%d) for a new path %x\n",
1161                                  mdc, lpm);
1162                         return mdc;
1163                 }
1164                 fcx_max_data = mdc * FCX_MAX_DATA_FACTOR;
1165                 if (fcx_max_data < private->fcx_max_data) {
1166                         dev_warn(&device->cdev->dev,
1167                                  "The maximum data size for zHPF requests %u "
1168                                  "on a new path %x is below the active maximum "
1169                                  "%u\n", fcx_max_data, lpm,
1170                                  private->fcx_max_data);
1171                         return -EACCES;
1172                 }
1173         }
1174         return 0;
1175 }
1176
1177 static int rebuild_device_uid(struct dasd_device *device,
1178                               struct path_verification_work_data *data)
1179 {
1180         struct dasd_eckd_private *private;
1181         struct dasd_path *path_data;
1182         __u8 lpm, opm;
1183         int rc;
1184
1185         rc = -ENODEV;
1186         private = (struct dasd_eckd_private *) device->private;
1187         path_data = &device->path_data;
1188         opm = device->path_data.opm;
1189
1190         for (lpm = 0x80; lpm; lpm >>= 1) {
1191                 if (!(lpm & opm))
1192                         continue;
1193                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1194                 memset(&data->cqr, 0, sizeof(data->cqr));
1195                 data->cqr.cpaddr = &data->ccw;
1196                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1197                                                      data->rcd_buffer,
1198                                                      lpm);
1199
1200                 if (rc) {
1201                         if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1202                                 continue;
1203                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1204                                         "Read configuration data "
1205                                         "returned error %d", rc);
1206                         break;
1207                 }
1208                 memcpy(private->conf_data, data->rcd_buffer,
1209                        DASD_ECKD_RCD_DATA_SIZE);
1210                 if (dasd_eckd_identify_conf_parts(private)) {
1211                         rc = -ENODEV;
1212                 } else /* first valid path is enough */
1213                         break;
1214         }
1215
1216         if (!rc)
1217                 rc = dasd_eckd_generate_uid(device);
1218
1219         return rc;
1220 }
1221
1222 static void do_path_verification_work(struct work_struct *work)
1223 {
1224         struct path_verification_work_data *data;
1225         struct dasd_device *device;
1226         struct dasd_eckd_private path_private;
1227         struct dasd_uid *uid;
1228         __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1229         __u8 lpm, opm, npm, ppm, epm;
1230         unsigned long flags;
1231         char print_uid[60];
1232         int rc;
1233
1234         data = container_of(work, struct path_verification_work_data, worker);
1235         device = data->device;
1236
1237         /* delay path verification until device was resumed */
1238         if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1239                 schedule_work(work);
1240                 return;
1241         }
1242
1243         opm = 0;
1244         npm = 0;
1245         ppm = 0;
1246         epm = 0;
1247         for (lpm = 0x80; lpm; lpm >>= 1) {
1248                 if (!(lpm & data->tbvpm))
1249                         continue;
1250                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1251                 memset(&data->cqr, 0, sizeof(data->cqr));
1252                 data->cqr.cpaddr = &data->ccw;
1253                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1254                                                      data->rcd_buffer,
1255                                                      lpm);
1256                 if (!rc) {
1257                         switch (dasd_eckd_path_access(data->rcd_buffer,
1258                                                       DASD_ECKD_RCD_DATA_SIZE)
1259                                 ) {
1260                         case 0x02:
1261                                 npm |= lpm;
1262                                 break;
1263                         case 0x03:
1264                                 ppm |= lpm;
1265                                 break;
1266                         }
1267                         opm |= lpm;
1268                 } else if (rc == -EOPNOTSUPP) {
1269                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1270                                         "path verification: No configuration "
1271                                         "data retrieved");
1272                         opm |= lpm;
1273                 } else if (rc == -EAGAIN) {
1274                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1275                                         "path verification: device is stopped,"
1276                                         " try again later");
1277                         epm |= lpm;
1278                 } else {
1279                         dev_warn(&device->cdev->dev,
1280                                  "Reading device feature codes failed "
1281                                  "(rc=%d) for new path %x\n", rc, lpm);
1282                         continue;
1283                 }
1284                 if (verify_fcx_max_data(device, lpm)) {
1285                         opm &= ~lpm;
1286                         npm &= ~lpm;
1287                         ppm &= ~lpm;
1288                         continue;
1289                 }
1290
1291                 /*
1292                  * save conf_data for comparison after
1293                  * rebuild_device_uid may have changed
1294                  * the original data
1295                  */
1296                 memcpy(&path_rcd_buf, data->rcd_buffer,
1297                        DASD_ECKD_RCD_DATA_SIZE);
1298                 path_private.conf_data = (void *) &path_rcd_buf;
1299                 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1300                 if (dasd_eckd_identify_conf_parts(&path_private)) {
1301                         path_private.conf_data = NULL;
1302                         path_private.conf_len = 0;
1303                         continue;
1304                 }
1305
1306                 /*
1307                  * compare path UID with device UID only if at least
1308                  * one valid path is left
1309                  * in other case the device UID may have changed and
1310                  * the first working path UID will be used as device UID
1311                  */
1312                 if (device->path_data.opm &&
1313                     dasd_eckd_compare_path_uid(device, &path_private)) {
1314                         /*
1315                          * the comparison was not successful
1316                          * rebuild the device UID with at least one
1317                          * known path in case a z/VM hyperswap command
1318                          * has changed the device
1319                          *
1320                          * after this compare again
1321                          *
1322                          * if either the rebuild or the recompare fails
1323                          * the path can not be used
1324                          */
1325                         if (rebuild_device_uid(device, data) ||
1326                             dasd_eckd_compare_path_uid(
1327                                     device, &path_private)) {
1328                                 uid = &path_private.uid;
1329                                 if (strlen(uid->vduit) > 0)
1330                                         snprintf(print_uid, sizeof(print_uid),
1331                                                  "%s.%s.%04x.%02x.%s",
1332                                                  uid->vendor, uid->serial,
1333                                                  uid->ssid, uid->real_unit_addr,
1334                                                  uid->vduit);
1335                                 else
1336                                         snprintf(print_uid, sizeof(print_uid),
1337                                                  "%s.%s.%04x.%02x",
1338                                                  uid->vendor, uid->serial,
1339                                                  uid->ssid,
1340                                                  uid->real_unit_addr);
1341                                 dev_err(&device->cdev->dev,
1342                                         "The newly added channel path %02X "
1343                                         "will not be used because it leads "
1344                                         "to a different device %s\n",
1345                                         lpm, print_uid);
1346                                 opm &= ~lpm;
1347                                 npm &= ~lpm;
1348                                 ppm &= ~lpm;
1349                                 continue;
1350                         }
1351                 }
1352
1353                 /*
1354                  * There is a small chance that a path is lost again between
1355                  * above path verification and the following modification of
1356                  * the device opm mask. We could avoid that race here by using
1357                  * yet another path mask, but we rather deal with this unlikely
1358                  * situation in dasd_start_IO.
1359                  */
1360                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1361                 if (!device->path_data.opm && opm) {
1362                         device->path_data.opm = opm;
1363                         dasd_generic_path_operational(device);
1364                 } else
1365                         device->path_data.opm |= opm;
1366                 device->path_data.npm |= npm;
1367                 device->path_data.ppm |= ppm;
1368                 device->path_data.tbvpm |= epm;
1369                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1370         }
1371
1372         dasd_put_device(device);
1373         if (data->isglobal)
1374                 mutex_unlock(&dasd_path_verification_mutex);
1375         else
1376                 kfree(data);
1377 }
1378
1379 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1380 {
1381         struct path_verification_work_data *data;
1382
1383         data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1384         if (!data) {
1385                 if (mutex_trylock(&dasd_path_verification_mutex)) {
1386                         data = path_verification_worker;
1387                         data->isglobal = 1;
1388                 } else
1389                         return -ENOMEM;
1390         } else {
1391                 memset(data, 0, sizeof(*data));
1392                 data->isglobal = 0;
1393         }
1394         INIT_WORK(&data->worker, do_path_verification_work);
1395         dasd_get_device(device);
1396         data->device = device;
1397         data->tbvpm = lpm;
1398         schedule_work(&data->worker);
1399         return 0;
1400 }
1401
1402 static int dasd_eckd_read_features(struct dasd_device *device)
1403 {
1404         struct dasd_psf_prssd_data *prssdp;
1405         struct dasd_rssd_features *features;
1406         struct dasd_ccw_req *cqr;
1407         struct ccw1 *ccw;
1408         int rc;
1409         struct dasd_eckd_private *private;
1410
1411         private = (struct dasd_eckd_private *) device->private;
1412         memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1413         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1414                                    (sizeof(struct dasd_psf_prssd_data) +
1415                                     sizeof(struct dasd_rssd_features)),
1416                                    device);
1417         if (IS_ERR(cqr)) {
1418                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1419                                 "allocate initialization request");
1420                 return PTR_ERR(cqr);
1421         }
1422         cqr->startdev = device;
1423         cqr->memdev = device;
1424         cqr->block = NULL;
1425         cqr->retries = 256;
1426         cqr->expires = 10 * HZ;
1427
1428         /* Prepare for Read Subsystem Data */
1429         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1430         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1431         prssdp->order = PSF_ORDER_PRSSD;
1432         prssdp->suborder = 0x41;        /* Read Feature Codes */
1433         /* all other bytes of prssdp must be zero */
1434
1435         ccw = cqr->cpaddr;
1436         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1437         ccw->count = sizeof(struct dasd_psf_prssd_data);
1438         ccw->flags |= CCW_FLAG_CC;
1439         ccw->cda = (__u32)(addr_t) prssdp;
1440
1441         /* Read Subsystem Data - feature codes */
1442         features = (struct dasd_rssd_features *) (prssdp + 1);
1443         memset(features, 0, sizeof(struct dasd_rssd_features));
1444
1445         ccw++;
1446         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1447         ccw->count = sizeof(struct dasd_rssd_features);
1448         ccw->cda = (__u32)(addr_t) features;
1449
1450         cqr->buildclk = get_clock();
1451         cqr->status = DASD_CQR_FILLED;
1452         rc = dasd_sleep_on(cqr);
1453         if (rc == 0) {
1454                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1455                 features = (struct dasd_rssd_features *) (prssdp + 1);
1456                 memcpy(&private->features, features,
1457                        sizeof(struct dasd_rssd_features));
1458         } else
1459                 dev_warn(&device->cdev->dev, "Reading device feature codes"
1460                          " failed with rc=%d\n", rc);
1461         dasd_sfree_request(cqr, cqr->memdev);
1462         return rc;
1463 }
1464
1465
1466 /*
1467  * Build CP for Perform Subsystem Function - SSC.
1468  */
1469 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1470                                                     int enable_pav)
1471 {
1472         struct dasd_ccw_req *cqr;
1473         struct dasd_psf_ssc_data *psf_ssc_data;
1474         struct ccw1 *ccw;
1475
1476         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1477                                   sizeof(struct dasd_psf_ssc_data),
1478                                   device);
1479
1480         if (IS_ERR(cqr)) {
1481                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1482                            "Could not allocate PSF-SSC request");
1483                 return cqr;
1484         }
1485         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1486         psf_ssc_data->order = PSF_ORDER_SSC;
1487         psf_ssc_data->suborder = 0xc0;
1488         if (enable_pav) {
1489                 psf_ssc_data->suborder |= 0x08;
1490                 psf_ssc_data->reserved[0] = 0x88;
1491         }
1492         ccw = cqr->cpaddr;
1493         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1494         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1495         ccw->count = 66;
1496
1497         cqr->startdev = device;
1498         cqr->memdev = device;
1499         cqr->block = NULL;
1500         cqr->retries = 256;
1501         cqr->expires = 10*HZ;
1502         cqr->buildclk = get_clock();
1503         cqr->status = DASD_CQR_FILLED;
1504         return cqr;
1505 }
1506
1507 /*
1508  * Perform Subsystem Function.
1509  * It is necessary to trigger CIO for channel revalidation since this
1510  * call might change behaviour of DASD devices.
1511  */
1512 static int
1513 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1514                   unsigned long flags)
1515 {
1516         struct dasd_ccw_req *cqr;
1517         int rc;
1518
1519         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1520         if (IS_ERR(cqr))
1521                 return PTR_ERR(cqr);
1522
1523         /*
1524          * set flags e.g. turn on failfast, to prevent blocking
1525          * the calling function should handle failed requests
1526          */
1527         cqr->flags |= flags;
1528
1529         rc = dasd_sleep_on(cqr);
1530         if (!rc)
1531                 /* trigger CIO to reprobe devices */
1532                 css_schedule_reprobe();
1533         else if (cqr->intrc == -EAGAIN)
1534                 rc = -EAGAIN;
1535
1536         dasd_sfree_request(cqr, cqr->memdev);
1537         return rc;
1538 }
1539
1540 /*
1541  * Valide storage server of current device.
1542  */
1543 static int dasd_eckd_validate_server(struct dasd_device *device,
1544                                      unsigned long flags)
1545 {
1546         int rc;
1547         struct dasd_eckd_private *private;
1548         int enable_pav;
1549
1550         private = (struct dasd_eckd_private *) device->private;
1551         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1552             private->uid.type == UA_HYPER_PAV_ALIAS)
1553                 return 0;
1554         if (dasd_nopav || MACHINE_IS_VM)
1555                 enable_pav = 0;
1556         else
1557                 enable_pav = 1;
1558         rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1559
1560         /* may be requested feature is not available on server,
1561          * therefore just report error and go ahead */
1562         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1563                         "returned rc=%d", private->uid.ssid, rc);
1564         return rc;
1565 }
1566
1567 /*
1568  * worker to do a validate server in case of a lost pathgroup
1569  */
1570 static void dasd_eckd_do_validate_server(struct work_struct *work)
1571 {
1572         struct dasd_device *device = container_of(work, struct dasd_device,
1573                                                   kick_validate);
1574         if (dasd_eckd_validate_server(device, DASD_CQR_FLAGS_FAILFAST)
1575             == -EAGAIN) {
1576                 /* schedule worker again if failed */
1577                 schedule_work(&device->kick_validate);
1578                 return;
1579         }
1580
1581         dasd_put_device(device);
1582 }
1583
1584 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1585 {
1586         dasd_get_device(device);
1587         /* exit if device not online or in offline processing */
1588         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1589            device->state < DASD_STATE_ONLINE) {
1590                 dasd_put_device(device);
1591                 return;
1592         }
1593         /* queue call to do_validate_server to the kernel event daemon. */
1594         schedule_work(&device->kick_validate);
1595 }
1596
1597 static u32 get_fcx_max_data(struct dasd_device *device)
1598 {
1599 #if defined(CONFIG_64BIT)
1600         int tpm, mdc;
1601         int fcx_in_css, fcx_in_gneq, fcx_in_features;
1602         struct dasd_eckd_private *private;
1603
1604         if (dasd_nofcx)
1605                 return 0;
1606         /* is transport mode supported? */
1607         private = (struct dasd_eckd_private *) device->private;
1608         fcx_in_css = css_general_characteristics.fcx;
1609         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1610         fcx_in_features = private->features.feature[40] & 0x80;
1611         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1612
1613         if (!tpm)
1614                 return 0;
1615
1616         mdc = ccw_device_get_mdc(device->cdev, 0);
1617         if (mdc < 0) {
1618                 dev_warn(&device->cdev->dev, "Detecting the maximum supported"
1619                          " data size for zHPF requests failed\n");
1620                 return 0;
1621         } else
1622                 return mdc * FCX_MAX_DATA_FACTOR;
1623 #else
1624         return 0;
1625 #endif
1626 }
1627
1628 /*
1629  * Check device characteristics.
1630  * If the device is accessible using ECKD discipline, the device is enabled.
1631  */
1632 static int
1633 dasd_eckd_check_characteristics(struct dasd_device *device)
1634 {
1635         struct dasd_eckd_private *private;
1636         struct dasd_block *block;
1637         struct dasd_uid temp_uid;
1638         int rc, i;
1639         int readonly;
1640         unsigned long value;
1641
1642         /* setup work queue for validate server*/
1643         INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1644
1645         if (!ccw_device_is_pathgroup(device->cdev)) {
1646                 dev_warn(&device->cdev->dev,
1647                          "A channel path group could not be established\n");
1648                 return -EIO;
1649         }
1650         if (!ccw_device_is_multipath(device->cdev)) {
1651                 dev_info(&device->cdev->dev,
1652                          "The DASD is not operating in multipath mode\n");
1653         }
1654         private = (struct dasd_eckd_private *) device->private;
1655         if (!private) {
1656                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1657                 if (!private) {
1658                         dev_warn(&device->cdev->dev,
1659                                  "Allocating memory for private DASD data "
1660                                  "failed\n");
1661                         return -ENOMEM;
1662                 }
1663                 device->private = (void *) private;
1664         } else {
1665                 memset(private, 0, sizeof(*private));
1666         }
1667         /* Invalidate status of initial analysis. */
1668         private->init_cqr_status = -1;
1669         /* Set default cache operations. */
1670         private->attrib.operation = DASD_NORMAL_CACHE;
1671         private->attrib.nr_cyl = 0;
1672
1673         /* Read Configuration Data */
1674         rc = dasd_eckd_read_conf(device);
1675         if (rc)
1676                 goto out_err1;
1677
1678         /* set default timeout */
1679         device->default_expires = DASD_EXPIRES;
1680         if (private->gneq) {
1681                 value = 1;
1682                 for (i = 0; i < private->gneq->timeout.value; i++)
1683                         value = 10 * value;
1684                 value = value * private->gneq->timeout.number;
1685                 /* do not accept useless values */
1686                 if (value != 0 && value <= DASD_EXPIRES_MAX)
1687                         device->default_expires = value;
1688         }
1689
1690         dasd_eckd_get_uid(device, &temp_uid);
1691         if (temp_uid.type == UA_BASE_DEVICE) {
1692                 block = dasd_alloc_block();
1693                 if (IS_ERR(block)) {
1694                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1695                                         "could not allocate dasd "
1696                                         "block structure");
1697                         rc = PTR_ERR(block);
1698                         goto out_err1;
1699                 }
1700                 device->block = block;
1701                 block->base = device;
1702         }
1703
1704         /* register lcu with alias handling, enable PAV */
1705         rc = dasd_alias_make_device_known_to_lcu(device);
1706         if (rc)
1707                 goto out_err2;
1708
1709         dasd_eckd_validate_server(device, 0);
1710
1711         /* device may report different configuration data after LCU setup */
1712         rc = dasd_eckd_read_conf(device);
1713         if (rc)
1714                 goto out_err3;
1715
1716         /* Read Feature Codes */
1717         dasd_eckd_read_features(device);
1718
1719         /* Read Device Characteristics */
1720         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1721                                          &private->rdc_data, 64);
1722         if (rc) {
1723                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1724                                 "Read device characteristic failed, rc=%d", rc);
1725                 goto out_err3;
1726         }
1727
1728         if ((device->features & DASD_FEATURE_USERAW) &&
1729             !(private->rdc_data.facilities.RT_in_LR)) {
1730                 dev_err(&device->cdev->dev, "The storage server does not "
1731                         "support raw-track access\n");
1732                 rc = -EINVAL;
1733                 goto out_err3;
1734         }
1735
1736         /* find the valid cylinder size */
1737         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1738             private->rdc_data.long_no_cyl)
1739                 private->real_cyl = private->rdc_data.long_no_cyl;
1740         else
1741                 private->real_cyl = private->rdc_data.no_cyl;
1742
1743         private->fcx_max_data = get_fcx_max_data(device);
1744
1745         readonly = dasd_device_is_ro(device);
1746         if (readonly)
1747                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1748
1749         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1750                  "with %d cylinders, %d heads, %d sectors%s\n",
1751                  private->rdc_data.dev_type,
1752                  private->rdc_data.dev_model,
1753                  private->rdc_data.cu_type,
1754                  private->rdc_data.cu_model.model,
1755                  private->real_cyl,
1756                  private->rdc_data.trk_per_cyl,
1757                  private->rdc_data.sec_per_trk,
1758                  readonly ? ", read-only device" : "");
1759         return 0;
1760
1761 out_err3:
1762         dasd_alias_disconnect_device_from_lcu(device);
1763 out_err2:
1764         dasd_free_block(device->block);
1765         device->block = NULL;
1766 out_err1:
1767         kfree(private->conf_data);
1768         kfree(device->private);
1769         device->private = NULL;
1770         return rc;
1771 }
1772
1773 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1774 {
1775         struct dasd_eckd_private *private;
1776
1777         private = (struct dasd_eckd_private *) device->private;
1778         dasd_alias_disconnect_device_from_lcu(device);
1779         private->ned = NULL;
1780         private->sneq = NULL;
1781         private->vdsneq = NULL;
1782         private->gneq = NULL;
1783         private->conf_len = 0;
1784         kfree(private->conf_data);
1785         private->conf_data = NULL;
1786 }
1787
1788 static struct dasd_ccw_req *
1789 dasd_eckd_analysis_ccw(struct dasd_device *device)
1790 {
1791         struct dasd_eckd_private *private;
1792         struct eckd_count *count_data;
1793         struct LO_eckd_data *LO_data;
1794         struct dasd_ccw_req *cqr;
1795         struct ccw1 *ccw;
1796         int cplength, datasize;
1797         int i;
1798
1799         private = (struct dasd_eckd_private *) device->private;
1800
1801         cplength = 8;
1802         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1803         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1804         if (IS_ERR(cqr))
1805                 return cqr;
1806         ccw = cqr->cpaddr;
1807         /* Define extent for the first 3 tracks. */
1808         define_extent(ccw++, cqr->data, 0, 2,
1809                       DASD_ECKD_CCW_READ_COUNT, device);
1810         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1811         /* Locate record for the first 4 records on track 0. */
1812         ccw[-1].flags |= CCW_FLAG_CC;
1813         locate_record(ccw++, LO_data++, 0, 0, 4,
1814                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1815
1816         count_data = private->count_area;
1817         for (i = 0; i < 4; i++) {
1818                 ccw[-1].flags |= CCW_FLAG_CC;
1819                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1820                 ccw->flags = 0;
1821                 ccw->count = 8;
1822                 ccw->cda = (__u32)(addr_t) count_data;
1823                 ccw++;
1824                 count_data++;
1825         }
1826
1827         /* Locate record for the first record on track 2. */
1828         ccw[-1].flags |= CCW_FLAG_CC;
1829         locate_record(ccw++, LO_data++, 2, 0, 1,
1830                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1831         /* Read count ccw. */
1832         ccw[-1].flags |= CCW_FLAG_CC;
1833         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1834         ccw->flags = 0;
1835         ccw->count = 8;
1836         ccw->cda = (__u32)(addr_t) count_data;
1837
1838         cqr->block = NULL;
1839         cqr->startdev = device;
1840         cqr->memdev = device;
1841         cqr->retries = 255;
1842         cqr->buildclk = get_clock();
1843         cqr->status = DASD_CQR_FILLED;
1844         return cqr;
1845 }
1846
1847 /* differentiate between 'no record found' and any other error */
1848 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1849 {
1850         char *sense;
1851         if (init_cqr->status == DASD_CQR_DONE)
1852                 return INIT_CQR_OK;
1853         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1854                  init_cqr->status == DASD_CQR_FAILED) {
1855                 sense = dasd_get_sense(&init_cqr->irb);
1856                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1857                         return INIT_CQR_UNFORMATTED;
1858                 else
1859                         return INIT_CQR_ERROR;
1860         } else
1861                 return INIT_CQR_ERROR;
1862 }
1863
1864 /*
1865  * This is the callback function for the init_analysis cqr. It saves
1866  * the status of the initial analysis ccw before it frees it and kicks
1867  * the device to continue the startup sequence. This will call
1868  * dasd_eckd_do_analysis again (if the devices has not been marked
1869  * for deletion in the meantime).
1870  */
1871 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1872                                         void *data)
1873 {
1874         struct dasd_eckd_private *private;
1875         struct dasd_device *device;
1876
1877         device = init_cqr->startdev;
1878         private = (struct dasd_eckd_private *) device->private;
1879         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1880         dasd_sfree_request(init_cqr, device);
1881         dasd_kick_device(device);
1882 }
1883
1884 static int dasd_eckd_start_analysis(struct dasd_block *block)
1885 {
1886         struct dasd_ccw_req *init_cqr;
1887
1888         init_cqr = dasd_eckd_analysis_ccw(block->base);
1889         if (IS_ERR(init_cqr))
1890                 return PTR_ERR(init_cqr);
1891         init_cqr->callback = dasd_eckd_analysis_callback;
1892         init_cqr->callback_data = NULL;
1893         init_cqr->expires = 5*HZ;
1894         /* first try without ERP, so we can later handle unformatted
1895          * devices as special case
1896          */
1897         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1898         init_cqr->retries = 0;
1899         dasd_add_request_head(init_cqr);
1900         return -EAGAIN;
1901 }
1902
1903 static int dasd_eckd_end_analysis(struct dasd_block *block)
1904 {
1905         struct dasd_device *device;
1906         struct dasd_eckd_private *private;
1907         struct eckd_count *count_area;
1908         unsigned int sb, blk_per_trk;
1909         int status, i;
1910         struct dasd_ccw_req *init_cqr;
1911
1912         device = block->base;
1913         private = (struct dasd_eckd_private *) device->private;
1914         status = private->init_cqr_status;
1915         private->init_cqr_status = -1;
1916         if (status == INIT_CQR_ERROR) {
1917                 /* try again, this time with full ERP */
1918                 init_cqr = dasd_eckd_analysis_ccw(device);
1919                 dasd_sleep_on(init_cqr);
1920                 status = dasd_eckd_analysis_evaluation(init_cqr);
1921                 dasd_sfree_request(init_cqr, device);
1922         }
1923
1924         if (device->features & DASD_FEATURE_USERAW) {
1925                 block->bp_block = DASD_RAW_BLOCKSIZE;
1926                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1927                 block->s2b_shift = 3;
1928                 goto raw;
1929         }
1930
1931         if (status == INIT_CQR_UNFORMATTED) {
1932                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1933                 return -EMEDIUMTYPE;
1934         } else if (status == INIT_CQR_ERROR) {
1935                 dev_err(&device->cdev->dev,
1936                         "Detecting the DASD disk layout failed because "
1937                         "of an I/O error\n");
1938                 return -EIO;
1939         }
1940
1941         private->uses_cdl = 1;
1942         /* Check Track 0 for Compatible Disk Layout */
1943         count_area = NULL;
1944         for (i = 0; i < 3; i++) {
1945                 if (private->count_area[i].kl != 4 ||
1946                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
1947                     private->count_area[i].cyl != 0 ||
1948                     private->count_area[i].head != count_area_head[i] ||
1949                     private->count_area[i].record != count_area_rec[i]) {
1950                         private->uses_cdl = 0;
1951                         break;
1952                 }
1953         }
1954         if (i == 3)
1955                 count_area = &private->count_area[4];
1956
1957         if (private->uses_cdl == 0) {
1958                 for (i = 0; i < 5; i++) {
1959                         if ((private->count_area[i].kl != 0) ||
1960                             (private->count_area[i].dl !=
1961                              private->count_area[0].dl) ||
1962                             private->count_area[i].cyl !=  0 ||
1963                             private->count_area[i].head != count_area_head[i] ||
1964                             private->count_area[i].record != count_area_rec[i])
1965                                 break;
1966                 }
1967                 if (i == 5)
1968                         count_area = &private->count_area[0];
1969         } else {
1970                 if (private->count_area[3].record == 1)
1971                         dev_warn(&device->cdev->dev,
1972                                  "Track 0 has no records following the VTOC\n");
1973         }
1974
1975         if (count_area != NULL && count_area->kl == 0) {
1976                 /* we found notthing violating our disk layout */
1977                 if (dasd_check_blocksize(count_area->dl) == 0)
1978                         block->bp_block = count_area->dl;
1979         }
1980         if (block->bp_block == 0) {
1981                 dev_warn(&device->cdev->dev,
1982                          "The disk layout of the DASD is not supported\n");
1983                 return -EMEDIUMTYPE;
1984         }
1985         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1986         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1987                 block->s2b_shift++;
1988
1989         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1990
1991 raw:
1992         block->blocks = (private->real_cyl *
1993                           private->rdc_data.trk_per_cyl *
1994                           blk_per_trk);
1995
1996         dev_info(&device->cdev->dev,
1997                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
1998                  "%s\n", (block->bp_block >> 10),
1999                  ((private->real_cyl *
2000                    private->rdc_data.trk_per_cyl *
2001                    blk_per_trk * (block->bp_block >> 9)) >> 1),
2002                  ((blk_per_trk * block->bp_block) >> 10),
2003                  private->uses_cdl ?
2004                  "compatible disk layout" : "linux disk layout");
2005
2006         return 0;
2007 }
2008
2009 static int dasd_eckd_do_analysis(struct dasd_block *block)
2010 {
2011         struct dasd_eckd_private *private;
2012
2013         private = (struct dasd_eckd_private *) block->base->private;
2014         if (private->init_cqr_status < 0)
2015                 return dasd_eckd_start_analysis(block);
2016         else
2017                 return dasd_eckd_end_analysis(block);
2018 }
2019
2020 static int dasd_eckd_ready_to_online(struct dasd_device *device)
2021 {
2022         return dasd_alias_add_device(device);
2023 };
2024
2025 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2026 {
2027         cancel_work_sync(&device->reload_device);
2028         cancel_work_sync(&device->kick_validate);
2029         return dasd_alias_remove_device(device);
2030 };
2031
2032 static int
2033 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2034 {
2035         struct dasd_eckd_private *private;
2036
2037         private = (struct dasd_eckd_private *) block->base->private;
2038         if (dasd_check_blocksize(block->bp_block) == 0) {
2039                 geo->sectors = recs_per_track(&private->rdc_data,
2040                                               0, block->bp_block);
2041         }
2042         geo->cylinders = private->rdc_data.no_cyl;
2043         geo->heads = private->rdc_data.trk_per_cyl;
2044         return 0;
2045 }
2046
2047 static struct dasd_ccw_req *
2048 dasd_eckd_format_device(struct dasd_device * device,
2049                         struct format_data_t * fdata)
2050 {
2051         struct dasd_eckd_private *private;
2052         struct dasd_ccw_req *fcp;
2053         struct eckd_count *ect;
2054         struct ccw1 *ccw;
2055         void *data;
2056         int rpt;
2057         struct ch_t address;
2058         int cplength, datasize;
2059         int i;
2060         int intensity = 0;
2061         int r0_perm;
2062
2063         private = (struct dasd_eckd_private *) device->private;
2064         rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
2065         set_ch_t(&address,
2066                  fdata->start_unit / private->rdc_data.trk_per_cyl,
2067                  fdata->start_unit % private->rdc_data.trk_per_cyl);
2068
2069         /* Sanity checks. */
2070         if (fdata->start_unit >=
2071             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2072                 dev_warn(&device->cdev->dev, "Start track number %d used in "
2073                          "formatting is too big\n", fdata->start_unit);
2074                 return ERR_PTR(-EINVAL);
2075         }
2076         if (fdata->start_unit > fdata->stop_unit) {
2077                 dev_warn(&device->cdev->dev, "Start track %d used in "
2078                          "formatting exceeds end track\n", fdata->start_unit);
2079                 return ERR_PTR(-EINVAL);
2080         }
2081         if (dasd_check_blocksize(fdata->blksize) != 0) {
2082                 dev_warn(&device->cdev->dev,
2083                          "The DASD cannot be formatted with block size %d\n",
2084                          fdata->blksize);
2085                 return ERR_PTR(-EINVAL);
2086         }
2087
2088         /*
2089          * fdata->intensity is a bit string that tells us what to do:
2090          *   Bit 0: write record zero
2091          *   Bit 1: write home address, currently not supported
2092          *   Bit 2: invalidate tracks
2093          *   Bit 3: use OS/390 compatible disk layout (cdl)
2094          *   Bit 4: do not allow storage subsystem to modify record zero
2095          * Only some bit combinations do make sense.
2096          */
2097         if (fdata->intensity & 0x10) {
2098                 r0_perm = 0;
2099                 intensity = fdata->intensity & ~0x10;
2100         } else {
2101                 r0_perm = 1;
2102                 intensity = fdata->intensity;
2103         }
2104         switch (intensity) {
2105         case 0x00:      /* Normal format */
2106         case 0x08:      /* Normal format, use cdl. */
2107                 cplength = 2 + rpt;
2108                 datasize = sizeof(struct DE_eckd_data) +
2109                         sizeof(struct LO_eckd_data) +
2110                         rpt * 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 = 3 + rpt;
2115                 datasize = sizeof(struct DE_eckd_data) +
2116                         sizeof(struct LO_eckd_data) +
2117                         sizeof(struct eckd_count) +
2118                         rpt * 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 DE_eckd_data) +
2124                         sizeof(struct LO_eckd_data) +
2125                         sizeof(struct eckd_count);
2126                 break;
2127         default:
2128                 dev_warn(&device->cdev->dev, "An I/O control call used "
2129                          "incorrect flags 0x%x\n", fdata->intensity);
2130                 return ERR_PTR(-EINVAL);
2131         }
2132         /* Allocate the format ccw request. */
2133         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
2134         if (IS_ERR(fcp))
2135                 return fcp;
2136
2137         data = fcp->data;
2138         ccw = fcp->cpaddr;
2139
2140         switch (intensity & ~0x08) {
2141         case 0x00: /* Normal format. */
2142                 define_extent(ccw++, (struct DE_eckd_data *) data,
2143                               fdata->start_unit, fdata->start_unit,
2144                               DASD_ECKD_CCW_WRITE_CKD, device);
2145                 /* grant subsystem permission to format R0 */
2146                 if (r0_perm)
2147                         ((struct DE_eckd_data *)data)->ga_extended |= 0x04;
2148                 data += sizeof(struct DE_eckd_data);
2149                 ccw[-1].flags |= CCW_FLAG_CC;
2150                 locate_record(ccw++, (struct LO_eckd_data *) data,
2151                               fdata->start_unit, 0, rpt,
2152                               DASD_ECKD_CCW_WRITE_CKD, device,
2153                               fdata->blksize);
2154                 data += sizeof(struct LO_eckd_data);
2155                 break;
2156         case 0x01: /* Write record zero + format track. */
2157                 define_extent(ccw++, (struct DE_eckd_data *) data,
2158                               fdata->start_unit, fdata->start_unit,
2159                               DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2160                               device);
2161                 data += sizeof(struct DE_eckd_data);
2162                 ccw[-1].flags |= CCW_FLAG_CC;
2163                 locate_record(ccw++, (struct LO_eckd_data *) data,
2164                               fdata->start_unit, 0, rpt + 1,
2165                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
2166                               device->block->bp_block);
2167                 data += sizeof(struct LO_eckd_data);
2168                 break;
2169         case 0x04: /* Invalidate track. */
2170                 define_extent(ccw++, (struct DE_eckd_data *) data,
2171                               fdata->start_unit, fdata->start_unit,
2172                               DASD_ECKD_CCW_WRITE_CKD, device);
2173                 data += sizeof(struct DE_eckd_data);
2174                 ccw[-1].flags |= CCW_FLAG_CC;
2175                 locate_record(ccw++, (struct LO_eckd_data *) data,
2176                               fdata->start_unit, 0, 1,
2177                               DASD_ECKD_CCW_WRITE_CKD, device, 8);
2178                 data += sizeof(struct LO_eckd_data);
2179                 break;
2180         }
2181         if (intensity & 0x01) { /* write record zero */
2182                 ect = (struct eckd_count *) data;
2183                 data += sizeof(struct eckd_count);
2184                 ect->cyl = address.cyl;
2185                 ect->head = address.head;
2186                 ect->record = 0;
2187                 ect->kl = 0;
2188                 ect->dl = 8;
2189                 ccw[-1].flags |= CCW_FLAG_CC;
2190                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2191                 ccw->flags = CCW_FLAG_SLI;
2192                 ccw->count = 8;
2193                 ccw->cda = (__u32)(addr_t) ect;
2194                 ccw++;
2195         }
2196         if ((intensity & ~0x08) & 0x04) {       /* erase track */
2197                 ect = (struct eckd_count *) data;
2198                 data += sizeof(struct eckd_count);
2199                 ect->cyl = address.cyl;
2200                 ect->head = address.head;
2201                 ect->record = 1;
2202                 ect->kl = 0;
2203                 ect->dl = 0;
2204                 ccw[-1].flags |= CCW_FLAG_CC;
2205                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2206                 ccw->flags = CCW_FLAG_SLI;
2207                 ccw->count = 8;
2208                 ccw->cda = (__u32)(addr_t) ect;
2209         } else {                /* write remaining records */
2210                 for (i = 0; i < rpt; i++) {
2211                         ect = (struct eckd_count *) data;
2212                         data += sizeof(struct eckd_count);
2213                         ect->cyl = address.cyl;
2214                         ect->head = address.head;
2215                         ect->record = i + 1;
2216                         ect->kl = 0;
2217                         ect->dl = fdata->blksize;
2218                         /* Check for special tracks 0-1 when formatting CDL */
2219                         if ((intensity & 0x08) &&
2220                             fdata->start_unit == 0) {
2221                                 if (i < 3) {
2222                                         ect->kl = 4;
2223                                         ect->dl = sizes_trk0[i] - 4;
2224                                 }
2225                         }
2226                         if ((intensity & 0x08) &&
2227                             fdata->start_unit == 1) {
2228                                 ect->kl = 44;
2229                                 ect->dl = LABEL_SIZE - 44;
2230                         }
2231                         ccw[-1].flags |= CCW_FLAG_CC;
2232                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2233                         ccw->flags = CCW_FLAG_SLI;
2234                         ccw->count = 8;
2235                         ccw->cda = (__u32)(addr_t) ect;
2236                         ccw++;
2237                 }
2238         }
2239         fcp->startdev = device;
2240         fcp->memdev = device;
2241         fcp->retries = 256;
2242         fcp->buildclk = get_clock();
2243         fcp->status = DASD_CQR_FILLED;
2244         return fcp;
2245 }
2246
2247 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2248 {
2249         cqr->status = DASD_CQR_FILLED;
2250         if (cqr->block && (cqr->startdev != cqr->block->base)) {
2251                 dasd_eckd_reset_ccw_to_base_io(cqr);
2252                 cqr->startdev = cqr->block->base;
2253                 cqr->lpm = cqr->block->base->path_data.opm;
2254         }
2255 };
2256
2257 static dasd_erp_fn_t
2258 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2259 {
2260         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2261         struct ccw_device *cdev = device->cdev;
2262
2263         switch (cdev->id.cu_type) {
2264         case 0x3990:
2265         case 0x2105:
2266         case 0x2107:
2267         case 0x1750:
2268                 return dasd_3990_erp_action;
2269         case 0x9343:
2270         case 0x3880:
2271         default:
2272                 return dasd_default_erp_action;
2273         }
2274 }
2275
2276 static dasd_erp_fn_t
2277 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2278 {
2279         return dasd_default_erp_postaction;
2280 }
2281
2282 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2283                                               struct dasd_ccw_req *cqr,
2284                                               struct irb *irb)
2285 {
2286         char mask;
2287         char *sense = NULL;
2288         struct dasd_eckd_private *private;
2289
2290         private = (struct dasd_eckd_private *) device->private;
2291         /* first of all check for state change pending interrupt */
2292         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2293         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2294                 /*
2295                  * for alias only, not in offline processing
2296                  * and only if not suspended
2297                  */
2298                 if (!device->block && private->lcu &&
2299                     device->state == DASD_STATE_ONLINE &&
2300                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2301                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2302                         /*
2303                          * the state change could be caused by an alias
2304                          * reassignment remove device from alias handling
2305                          * to prevent new requests from being scheduled on
2306                          * the wrong alias device
2307                          */
2308                         dasd_alias_remove_device(device);
2309
2310                         /* schedule worker to reload device */
2311                         dasd_reload_device(device);
2312                 }
2313                 dasd_generic_handle_state_change(device);
2314                 return;
2315         }
2316
2317         sense = dasd_get_sense(irb);
2318         if (!sense)
2319                 return;
2320
2321         /* summary unit check */
2322         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2323             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2324                 dasd_alias_handle_summary_unit_check(device, irb);
2325                 return;
2326         }
2327
2328         /* service information message SIM */
2329         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
2330             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
2331                 dasd_3990_erp_handle_sim(device, sense);
2332                 return;
2333         }
2334
2335         /* loss of device reservation is handled via base devices only
2336          * as alias devices may be used with several bases
2337          */
2338         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
2339             (sense[7] == 0x3F) &&
2340             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
2341             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
2342                 if (device->features & DASD_FEATURE_FAILONSLCK)
2343                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
2344                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
2345                 dev_err(&device->cdev->dev,
2346                         "The device reservation was lost\n");
2347         }
2348 }
2349
2350 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
2351                                                struct dasd_device *startdev,
2352                                                struct dasd_block *block,
2353                                                struct request *req,
2354                                                sector_t first_rec,
2355                                                sector_t last_rec,
2356                                                sector_t first_trk,
2357                                                sector_t last_trk,
2358                                                unsigned int first_offs,
2359                                                unsigned int last_offs,
2360                                                unsigned int blk_per_trk,
2361                                                unsigned int blksize)
2362 {
2363         struct dasd_eckd_private *private;
2364         unsigned long *idaws;
2365         struct LO_eckd_data *LO_data;
2366         struct dasd_ccw_req *cqr;
2367         struct ccw1 *ccw;
2368         struct req_iterator iter;
2369         struct bio_vec *bv;
2370         char *dst;
2371         unsigned int off;
2372         int count, cidaw, cplength, datasize;
2373         sector_t recid;
2374         unsigned char cmd, rcmd;
2375         int use_prefix;
2376         struct dasd_device *basedev;
2377
2378         basedev = block->base;
2379         private = (struct dasd_eckd_private *) basedev->private;
2380         if (rq_data_dir(req) == READ)
2381                 cmd = DASD_ECKD_CCW_READ_MT;
2382         else if (rq_data_dir(req) == WRITE)
2383                 cmd = DASD_ECKD_CCW_WRITE_MT;
2384         else
2385                 return ERR_PTR(-EINVAL);
2386
2387         /* Check struct bio and count the number of blocks for the request. */
2388         count = 0;
2389         cidaw = 0;
2390         rq_for_each_segment(bv, req, iter) {
2391                 if (bv->bv_len & (blksize - 1))
2392                         /* Eckd can only do full blocks. */
2393                         return ERR_PTR(-EINVAL);
2394                 count += bv->bv_len >> (block->s2b_shift + 9);
2395 #if defined(CONFIG_64BIT)
2396                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
2397                         cidaw += bv->bv_len >> (block->s2b_shift + 9);
2398 #endif
2399         }
2400         /* Paranoia. */
2401         if (count != last_rec - first_rec + 1)
2402                 return ERR_PTR(-EINVAL);
2403
2404         /* use the prefix command if available */
2405         use_prefix = private->features.feature[8] & 0x01;
2406         if (use_prefix) {
2407                 /* 1x prefix + number of blocks */
2408                 cplength = 2 + count;
2409                 /* 1x prefix + cidaws*sizeof(long) */
2410                 datasize = sizeof(struct PFX_eckd_data) +
2411                         sizeof(struct LO_eckd_data) +
2412                         cidaw * sizeof(unsigned long);
2413         } else {
2414                 /* 1x define extent + 1x locate record + number of blocks */
2415                 cplength = 2 + count;
2416                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
2417                 datasize = sizeof(struct DE_eckd_data) +
2418                         sizeof(struct LO_eckd_data) +
2419                         cidaw * sizeof(unsigned long);
2420         }
2421         /* Find out the number of additional locate record ccws for cdl. */
2422         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
2423                 if (last_rec >= 2*blk_per_trk)
2424                         count = 2*blk_per_trk - first_rec;
2425                 cplength += count;
2426                 datasize += count*sizeof(struct LO_eckd_data);
2427         }
2428         /* Allocate the ccw request. */
2429         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2430                                    startdev);
2431         if (IS_ERR(cqr))
2432                 return cqr;
2433         ccw = cqr->cpaddr;
2434         /* First ccw is define extent or prefix. */
2435         if (use_prefix) {
2436                 if (prefix(ccw++, cqr->data, first_trk,
2437                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
2438                         /* Clock not in sync and XRC is enabled.
2439                          * Try again later.
2440                          */
2441                         dasd_sfree_request(cqr, startdev);
2442                         return ERR_PTR(-EAGAIN);
2443                 }
2444                 idaws = (unsigned long *) (cqr->data +
2445                                            sizeof(struct PFX_eckd_data));
2446         } else {
2447                 if (define_extent(ccw++, cqr->data, first_trk,
2448                                   last_trk, cmd, basedev) == -EAGAIN) {
2449                         /* Clock not in sync and XRC is enabled.
2450                          * Try again later.
2451                          */
2452                         dasd_sfree_request(cqr, startdev);
2453                         return ERR_PTR(-EAGAIN);
2454                 }
2455                 idaws = (unsigned long *) (cqr->data +
2456                                            sizeof(struct DE_eckd_data));
2457         }
2458         /* Build locate_record+read/write/ccws. */
2459         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
2460         recid = first_rec;
2461         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
2462                 /* Only standard blocks so there is just one locate record. */
2463                 ccw[-1].flags |= CCW_FLAG_CC;
2464                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
2465                               last_rec - recid + 1, cmd, basedev, blksize);
2466         }
2467         rq_for_each_segment(bv, req, iter) {
2468                 dst = page_address(bv->bv_page) + bv->bv_offset;
2469                 if (dasd_page_cache) {
2470                         char *copy = kmem_cache_alloc(dasd_page_cache,
2471                                                       GFP_DMA | __GFP_NOWARN);
2472                         if (copy && rq_data_dir(req) == WRITE)
2473                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
2474                         if (copy)
2475                                 dst = copy + bv->bv_offset;
2476                 }
2477                 for (off = 0; off < bv->bv_len; off += blksize) {
2478                         sector_t trkid = recid;
2479                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
2480                         rcmd = cmd;
2481                         count = blksize;
2482                         /* Locate record for cdl special block ? */
2483                         if (private->uses_cdl && recid < 2*blk_per_trk) {
2484                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
2485                                         rcmd |= 0x8;
2486                                         count = dasd_eckd_cdl_reclen(recid);
2487                                         if (count < blksize &&
2488                                             rq_data_dir(req) == READ)
2489                                                 memset(dst + count, 0xe5,
2490                                                        blksize - count);
2491                                 }
2492                                 ccw[-1].flags |= CCW_FLAG_CC;
2493                                 locate_record(ccw++, LO_data++,
2494                                               trkid, recoffs + 1,
2495                                               1, rcmd, basedev, count);
2496                         }
2497                         /* Locate record for standard blocks ? */
2498                         if (private->uses_cdl && recid == 2*blk_per_trk) {
2499                                 ccw[-1].flags |= CCW_FLAG_CC;
2500                                 locate_record(ccw++, LO_data++,
2501                                               trkid, recoffs + 1,
2502                                               last_rec - recid + 1,
2503                                               cmd, basedev, count);
2504                         }
2505                         /* Read/write ccw. */
2506                         ccw[-1].flags |= CCW_FLAG_CC;
2507                         ccw->cmd_code = rcmd;
2508                         ccw->count = count;
2509                         if (idal_is_needed(dst, blksize)) {
2510                                 ccw->cda = (__u32)(addr_t) idaws;
2511                                 ccw->flags = CCW_FLAG_IDA;
2512                                 idaws = idal_create_words(idaws, dst, blksize);
2513                         } else {
2514                                 ccw->cda = (__u32)(addr_t) dst;
2515                                 ccw->flags = 0;
2516                         }
2517                         ccw++;
2518                         dst += blksize;
2519                         recid++;
2520                 }
2521         }
2522         if (blk_noretry_request(req) ||
2523             block->base->features & DASD_FEATURE_FAILFAST)
2524                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2525         cqr->startdev = startdev;
2526         cqr->memdev = startdev;
2527         cqr->block = block;
2528         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2529         cqr->lpm = startdev->path_data.ppm;
2530         cqr->retries = 256;
2531         cqr->buildclk = get_clock();
2532         cqr->status = DASD_CQR_FILLED;
2533         return cqr;
2534 }
2535
2536 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
2537                                                struct dasd_device *startdev,
2538                                                struct dasd_block *block,
2539                                                struct request *req,
2540                                                sector_t first_rec,
2541                                                sector_t last_rec,
2542                                                sector_t first_trk,
2543                                                sector_t last_trk,
2544                                                unsigned int first_offs,
2545                                                unsigned int last_offs,
2546                                                unsigned int blk_per_trk,
2547                                                unsigned int blksize)
2548 {
2549         unsigned long *idaws;
2550         struct dasd_ccw_req *cqr;
2551         struct ccw1 *ccw;
2552         struct req_iterator iter;
2553         struct bio_vec *bv;
2554         char *dst, *idaw_dst;
2555         unsigned int cidaw, cplength, datasize;
2556         unsigned int tlf;
2557         sector_t recid;
2558         unsigned char cmd;
2559         struct dasd_device *basedev;
2560         unsigned int trkcount, count, count_to_trk_end;
2561         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
2562         unsigned char new_track, end_idaw;
2563         sector_t trkid;
2564         unsigned int recoffs;
2565
2566         basedev = block->base;
2567         if (rq_data_dir(req) == READ)
2568                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2569         else if (rq_data_dir(req) == WRITE)
2570                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2571         else
2572                 return ERR_PTR(-EINVAL);
2573
2574         /* Track based I/O needs IDAWs for each page, and not just for
2575          * 64 bit addresses. We need additional idals for pages
2576          * that get filled from two tracks, so we use the number
2577          * of records as upper limit.
2578          */
2579         cidaw = last_rec - first_rec + 1;
2580         trkcount = last_trk - first_trk + 1;
2581
2582         /* 1x prefix + one read/write ccw per track */
2583         cplength = 1 + trkcount;
2584
2585         /* on 31-bit we need space for two 32 bit addresses per page
2586          * on 64-bit one 64 bit address
2587          */
2588         datasize = sizeof(struct PFX_eckd_data) +
2589                 cidaw * sizeof(unsigned long long);
2590
2591         /* Allocate the ccw request. */
2592         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2593                                    startdev);
2594         if (IS_ERR(cqr))
2595                 return cqr;
2596         ccw = cqr->cpaddr;
2597         /* transfer length factor: how many bytes to read from the last track */
2598         if (first_trk == last_trk)
2599                 tlf = last_offs - first_offs + 1;
2600         else
2601                 tlf = last_offs + 1;
2602         tlf *= blksize;
2603
2604         if (prefix_LRE(ccw++, cqr->data, first_trk,
2605                        last_trk, cmd, basedev, startdev,
2606                        1 /* format */, first_offs + 1,
2607                        trkcount, blksize,
2608                        tlf) == -EAGAIN) {
2609                 /* Clock not in sync and XRC is enabled.
2610                  * Try again later.
2611                  */
2612                 dasd_sfree_request(cqr, startdev);
2613                 return ERR_PTR(-EAGAIN);
2614         }
2615
2616         /*
2617          * The translation of request into ccw programs must meet the
2618          * following conditions:
2619          * - all idaws but the first and the last must address full pages
2620          *   (or 2K blocks on 31-bit)
2621          * - the scope of a ccw and it's idal ends with the track boundaries
2622          */
2623         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2624         recid = first_rec;
2625         new_track = 1;
2626         end_idaw = 0;
2627         len_to_track_end = 0;
2628         idaw_dst = NULL;
2629         idaw_len = 0;
2630         rq_for_each_segment(bv, req, iter) {
2631                 dst = page_address(bv->bv_page) + bv->bv_offset;
2632                 seg_len = bv->bv_len;
2633                 while (seg_len) {
2634                         if (new_track) {
2635                                 trkid = recid;
2636                                 recoffs = sector_div(trkid, blk_per_trk);
2637                                 count_to_trk_end = blk_per_trk - recoffs;
2638                                 count = min((last_rec - recid + 1),
2639                                             (sector_t)count_to_trk_end);
2640                                 len_to_track_end = count * blksize;
2641                                 ccw[-1].flags |= CCW_FLAG_CC;
2642                                 ccw->cmd_code = cmd;
2643                                 ccw->count = len_to_track_end;
2644                                 ccw->cda = (__u32)(addr_t)idaws;
2645                                 ccw->flags = CCW_FLAG_IDA;
2646                                 ccw++;
2647                                 recid += count;
2648                                 new_track = 0;
2649                                 /* first idaw for a ccw may start anywhere */
2650                                 if (!idaw_dst)
2651                                         idaw_dst = dst;
2652                         }
2653                         /* If we start a new idaw, we must make sure that it
2654                          * starts on an IDA_BLOCK_SIZE boundary.
2655                          * If we continue an idaw, we must make sure that the
2656                          * current segment begins where the so far accumulated
2657                          * idaw ends
2658                          */
2659                         if (!idaw_dst) {
2660                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2661                                         dasd_sfree_request(cqr, startdev);
2662                                         return ERR_PTR(-ERANGE);
2663                                 } else
2664                                         idaw_dst = dst;
2665                         }
2666                         if ((idaw_dst + idaw_len) != dst) {
2667                                 dasd_sfree_request(cqr, startdev);
2668                                 return ERR_PTR(-ERANGE);
2669                         }
2670                         part_len = min(seg_len, len_to_track_end);
2671                         seg_len -= part_len;
2672                         dst += part_len;
2673                         idaw_len += part_len;
2674                         len_to_track_end -= part_len;
2675                         /* collected memory area ends on an IDA_BLOCK border,
2676                          * -> create an idaw
2677                          * idal_create_words will handle cases where idaw_len
2678                          * is larger then IDA_BLOCK_SIZE
2679                          */
2680                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2681                                 end_idaw = 1;
2682                         /* We also need to end the idaw at track end */
2683                         if (!len_to_track_end) {
2684                                 new_track = 1;
2685                                 end_idaw = 1;
2686                         }
2687                         if (end_idaw) {
2688                                 idaws = idal_create_words(idaws, idaw_dst,
2689                                                           idaw_len);
2690                                 idaw_dst = NULL;
2691                                 idaw_len = 0;
2692                                 end_idaw = 0;
2693                         }
2694                 }
2695         }
2696
2697         if (blk_noretry_request(req) ||
2698             block->base->features & DASD_FEATURE_FAILFAST)
2699                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2700         cqr->startdev = startdev;
2701         cqr->memdev = startdev;
2702         cqr->block = block;
2703         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2704         cqr->lpm = startdev->path_data.ppm;
2705         cqr->retries = 256;
2706         cqr->buildclk = get_clock();
2707         cqr->status = DASD_CQR_FILLED;
2708         return cqr;
2709 }
2710
2711 static int prepare_itcw(struct itcw *itcw,
2712                         unsigned int trk, unsigned int totrk, int cmd,
2713                         struct dasd_device *basedev,
2714                         struct dasd_device *startdev,
2715                         unsigned int rec_on_trk, int count,
2716                         unsigned int blksize,
2717                         unsigned int total_data_size,
2718                         unsigned int tlf,
2719                         unsigned int blk_per_trk)
2720 {
2721         struct PFX_eckd_data pfxdata;
2722         struct dasd_eckd_private *basepriv, *startpriv;
2723         struct DE_eckd_data *dedata;
2724         struct LRE_eckd_data *lredata;
2725         struct dcw *dcw;
2726
2727         u32 begcyl, endcyl;
2728         u16 heads, beghead, endhead;
2729         u8 pfx_cmd;
2730
2731         int rc = 0;
2732         int sector = 0;
2733         int dn, d;
2734
2735
2736         /* setup prefix data */
2737         basepriv = (struct dasd_eckd_private *) basedev->private;
2738         startpriv = (struct dasd_eckd_private *) startdev->private;
2739         dedata = &pfxdata.define_extent;
2740         lredata = &pfxdata.locate_record;
2741
2742         memset(&pfxdata, 0, sizeof(pfxdata));
2743         pfxdata.format = 1; /* PFX with LRE */
2744         pfxdata.base_address = basepriv->ned->unit_addr;
2745         pfxdata.base_lss = basepriv->ned->ID;
2746         pfxdata.validity.define_extent = 1;
2747
2748         /* private uid is kept up to date, conf_data may be outdated */
2749         if (startpriv->uid.type != UA_BASE_DEVICE) {
2750                 pfxdata.validity.verify_base = 1;
2751                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2752                         pfxdata.validity.hyper_pav = 1;
2753         }
2754
2755         switch (cmd) {
2756         case DASD_ECKD_CCW_READ_TRACK_DATA:
2757                 dedata->mask.perm = 0x1;
2758                 dedata->attributes.operation = basepriv->attrib.operation;
2759                 dedata->blk_size = blksize;
2760                 dedata->ga_extended |= 0x42;
2761                 lredata->operation.orientation = 0x0;
2762                 lredata->operation.operation = 0x0C;
2763                 lredata->auxiliary.check_bytes = 0x01;
2764                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2765                 break;
2766         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2767                 dedata->mask.perm = 0x02;
2768                 dedata->attributes.operation = basepriv->attrib.operation;
2769                 dedata->blk_size = blksize;
2770                 rc = check_XRC_on_prefix(&pfxdata, basedev);
2771                 dedata->ga_extended |= 0x42;
2772                 lredata->operation.orientation = 0x0;
2773                 lredata->operation.operation = 0x3F;
2774                 lredata->extended_operation = 0x23;
2775                 lredata->auxiliary.check_bytes = 0x2;
2776                 pfx_cmd = DASD_ECKD_CCW_PFX;
2777                 break;
2778         default:
2779                 DBF_DEV_EVENT(DBF_ERR, basedev,
2780                               "prepare itcw, unknown opcode 0x%x", cmd);
2781                 BUG();
2782                 break;
2783         }
2784         if (rc)
2785                 return rc;
2786
2787         dedata->attributes.mode = 0x3;  /* ECKD */
2788
2789         heads = basepriv->rdc_data.trk_per_cyl;
2790         begcyl = trk / heads;
2791         beghead = trk % heads;
2792         endcyl = totrk / heads;
2793         endhead = totrk % heads;
2794
2795         /* check for sequential prestage - enhance cylinder range */
2796         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2797             dedata->attributes.operation == DASD_SEQ_ACCESS) {
2798
2799                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2800                         endcyl += basepriv->attrib.nr_cyl;
2801                 else
2802                         endcyl = (basepriv->real_cyl - 1);
2803         }
2804
2805         set_ch_t(&dedata->beg_ext, begcyl, beghead);
2806         set_ch_t(&dedata->end_ext, endcyl, endhead);
2807
2808         dedata->ep_format = 0x20; /* records per track is valid */
2809         dedata->ep_rec_per_track = blk_per_trk;
2810
2811         if (rec_on_trk) {
2812                 switch (basepriv->rdc_data.dev_type) {
2813                 case 0x3390:
2814                         dn = ceil_quot(blksize + 6, 232);
2815                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
2816                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
2817                         break;
2818                 case 0x3380:
2819                         d = 7 + ceil_quot(blksize + 12, 32);
2820                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
2821                         break;
2822                 }
2823         }
2824
2825         lredata->auxiliary.length_valid = 1;
2826         lredata->auxiliary.length_scope = 1;
2827         lredata->auxiliary.imbedded_ccw_valid = 1;
2828         lredata->length = tlf;
2829         lredata->imbedded_ccw = cmd;
2830         lredata->count = count;
2831         lredata->sector = sector;
2832         set_ch_t(&lredata->seek_addr, begcyl, beghead);
2833         lredata->search_arg.cyl = lredata->seek_addr.cyl;
2834         lredata->search_arg.head = lredata->seek_addr.head;
2835         lredata->search_arg.record = rec_on_trk;
2836
2837         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
2838                      &pfxdata, sizeof(pfxdata), total_data_size);
2839         return IS_ERR(dcw) ? PTR_ERR(dcw) : 0;
2840 }
2841
2842 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
2843                                                struct dasd_device *startdev,
2844                                                struct dasd_block *block,
2845                                                struct request *req,
2846                                                sector_t first_rec,
2847                                                sector_t last_rec,
2848                                                sector_t first_trk,
2849                                                sector_t last_trk,
2850                                                unsigned int first_offs,
2851                                                unsigned int last_offs,
2852                                                unsigned int blk_per_trk,
2853                                                unsigned int blksize)
2854 {
2855         struct dasd_ccw_req *cqr;
2856         struct req_iterator iter;
2857         struct bio_vec *bv;
2858         char *dst;
2859         unsigned int trkcount, ctidaw;
2860         unsigned char cmd;
2861         struct dasd_device *basedev;
2862         unsigned int tlf;
2863         struct itcw *itcw;
2864         struct tidaw *last_tidaw = NULL;
2865         int itcw_op;
2866         size_t itcw_size;
2867         u8 tidaw_flags;
2868         unsigned int seg_len, part_len, len_to_track_end;
2869         unsigned char new_track;
2870         sector_t recid, trkid;
2871         unsigned int offs;
2872         unsigned int count, count_to_trk_end;
2873         int ret;
2874
2875         basedev = block->base;
2876         if (rq_data_dir(req) == READ) {
2877                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2878                 itcw_op = ITCW_OP_READ;
2879         } else if (rq_data_dir(req) == WRITE) {
2880                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2881                 itcw_op = ITCW_OP_WRITE;
2882         } else
2883                 return ERR_PTR(-EINVAL);
2884
2885         /* trackbased I/O needs address all memory via TIDAWs,
2886          * not just for 64 bit addresses. This allows us to map
2887          * each segment directly to one tidaw.
2888          * In the case of write requests, additional tidaws may
2889          * be needed when a segment crosses a track boundary.
2890          */
2891         trkcount = last_trk - first_trk + 1;
2892         ctidaw = 0;
2893         rq_for_each_segment(bv, req, iter) {
2894                 ++ctidaw;
2895         }
2896         if (rq_data_dir(req) == WRITE)
2897                 ctidaw += (last_trk - first_trk);
2898
2899         /* Allocate the ccw request. */
2900         itcw_size = itcw_calc_size(0, ctidaw, 0);
2901         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2902         if (IS_ERR(cqr))
2903                 return cqr;
2904
2905         /* transfer length factor: how many bytes to read from the last track */
2906         if (first_trk == last_trk)
2907                 tlf = last_offs - first_offs + 1;
2908         else
2909                 tlf = last_offs + 1;
2910         tlf *= blksize;
2911
2912         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
2913         if (IS_ERR(itcw)) {
2914                 ret = -EINVAL;
2915                 goto out_error;
2916         }
2917         cqr->cpaddr = itcw_get_tcw(itcw);
2918         if (prepare_itcw(itcw, first_trk, last_trk,
2919                          cmd, basedev, startdev,
2920                          first_offs + 1,
2921                          trkcount, blksize,
2922                          (last_rec - first_rec + 1) * blksize,
2923                          tlf, blk_per_trk) == -EAGAIN) {
2924                 /* Clock not in sync and XRC is enabled.
2925                  * Try again later.
2926                  */
2927                 ret = -EAGAIN;
2928                 goto out_error;
2929         }
2930         len_to_track_end = 0;
2931         /*
2932          * A tidaw can address 4k of memory, but must not cross page boundaries
2933          * We can let the block layer handle this by setting
2934          * blk_queue_segment_boundary to page boundaries and
2935          * blk_max_segment_size to page size when setting up the request queue.
2936          * For write requests, a TIDAW must not cross track boundaries, because
2937          * we have to set the CBC flag on the last tidaw for each track.
2938          */
2939         if (rq_data_dir(req) == WRITE) {
2940                 new_track = 1;
2941                 recid = first_rec;
2942                 rq_for_each_segment(bv, req, iter) {
2943                         dst = page_address(bv->bv_page) + bv->bv_offset;
2944                         seg_len = bv->bv_len;
2945                         while (seg_len) {
2946                                 if (new_track) {
2947                                         trkid = recid;
2948                                         offs = sector_div(trkid, blk_per_trk);
2949                                         count_to_trk_end = blk_per_trk - offs;
2950                                         count = min((last_rec - recid + 1),
2951                                                     (sector_t)count_to_trk_end);
2952                                         len_to_track_end = count * blksize;
2953                                         recid += count;
2954                                         new_track = 0;
2955                                 }
2956                                 part_len = min(seg_len, len_to_track_end);
2957                                 seg_len -= part_len;
2958                                 len_to_track_end -= part_len;
2959                                 /* We need to end the tidaw at track end */
2960                                 if (!len_to_track_end) {
2961                                         new_track = 1;
2962                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
2963                                 } else
2964                                         tidaw_flags = 0;
2965                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
2966                                                             dst, part_len);
2967                                 if (IS_ERR(last_tidaw)) {
2968                                         ret = -EINVAL;
2969                                         goto out_error;
2970                                 }
2971                                 dst += part_len;
2972                         }
2973                 }
2974         } else {
2975                 rq_for_each_segment(bv, req, iter) {
2976                         dst = page_address(bv->bv_page) + bv->bv_offset;
2977                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
2978                                                     dst, bv->bv_len);
2979                         if (IS_ERR(last_tidaw)) {
2980                                 ret = -EINVAL;
2981                                 goto out_error;
2982                         }
2983                 }
2984         }
2985         last_tidaw->flags |= TIDAW_FLAGS_LAST;
2986         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
2987         itcw_finalize(itcw);
2988
2989         if (blk_noretry_request(req) ||
2990             block->base->features & DASD_FEATURE_FAILFAST)
2991                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2992         cqr->cpmode = 1;
2993         cqr->startdev = startdev;
2994         cqr->memdev = startdev;
2995         cqr->block = block;
2996         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2997         cqr->lpm = startdev->path_data.ppm;
2998         cqr->retries = 256;
2999         cqr->buildclk = get_clock();
3000         cqr->status = DASD_CQR_FILLED;
3001         return cqr;
3002 out_error:
3003         dasd_sfree_request(cqr, startdev);
3004         return ERR_PTR(ret);
3005 }
3006
3007 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3008                                                struct dasd_block *block,
3009                                                struct request *req)
3010 {
3011         int cmdrtd, cmdwtd;
3012         int use_prefix;
3013         int fcx_multitrack;
3014         struct dasd_eckd_private *private;
3015         struct dasd_device *basedev;
3016         sector_t first_rec, last_rec;
3017         sector_t first_trk, last_trk;
3018         unsigned int first_offs, last_offs;
3019         unsigned int blk_per_trk, blksize;
3020         int cdlspecial;
3021         unsigned int data_size;
3022         struct dasd_ccw_req *cqr;
3023
3024         basedev = block->base;
3025         private = (struct dasd_eckd_private *) basedev->private;
3026
3027         /* Calculate number of blocks/records per track. */
3028         blksize = block->bp_block;
3029         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3030         if (blk_per_trk == 0)
3031                 return ERR_PTR(-EINVAL);
3032         /* Calculate record id of first and last block. */
3033         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3034         first_offs = sector_div(first_trk, blk_per_trk);
3035         last_rec = last_trk =
3036                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3037         last_offs = sector_div(last_trk, blk_per_trk);
3038         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3039
3040         fcx_multitrack = private->features.feature[40] & 0x20;
3041         data_size = blk_rq_bytes(req);
3042         /* tpm write request add CBC data on each track boundary */
3043         if (rq_data_dir(req) == WRITE)
3044                 data_size += (last_trk - first_trk) * 4;
3045
3046         /* is read track data and write track data in command mode supported? */
3047         cmdrtd = private->features.feature[9] & 0x20;
3048         cmdwtd = private->features.feature[12] & 0x40;
3049         use_prefix = private->features.feature[8] & 0x01;
3050
3051         cqr = NULL;
3052         if (cdlspecial || dasd_page_cache) {
3053                 /* do nothing, just fall through to the cmd mode single case */
3054         } else if ((data_size <= private->fcx_max_data)
3055                    && (fcx_multitrack || (first_trk == last_trk))) {
3056                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3057                                                     first_rec, last_rec,
3058                                                     first_trk, last_trk,
3059                                                     first_offs, last_offs,
3060                                                     blk_per_trk, blksize);
3061                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3062                     (PTR_ERR(cqr) != -ENOMEM))
3063                         cqr = NULL;
3064         } else if (use_prefix &&
3065                    (((rq_data_dir(req) == READ) && cmdrtd) ||
3066                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3067                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3068                                                    first_rec, last_rec,
3069                                                    first_trk, last_trk,
3070                                                    first_offs, last_offs,
3071                                                    blk_per_trk, blksize);
3072                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3073                     (PTR_ERR(cqr) != -ENOMEM))
3074                         cqr = NULL;
3075         }
3076         if (!cqr)
3077                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3078                                                     first_rec, last_rec,
3079                                                     first_trk, last_trk,
3080                                                     first_offs, last_offs,
3081                                                     blk_per_trk, blksize);
3082         return cqr;
3083 }
3084
3085 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
3086                                                struct dasd_block *block,
3087                                                struct request *req)
3088 {
3089         unsigned long *idaws;
3090         struct dasd_device *basedev;
3091         struct dasd_ccw_req *cqr;
3092         struct ccw1 *ccw;
3093         struct req_iterator iter;
3094         struct bio_vec *bv;
3095         char *dst;
3096         unsigned char cmd;
3097         unsigned int trkcount;
3098         unsigned int seg_len, len_to_track_end;
3099         unsigned int first_offs;
3100         unsigned int cidaw, cplength, datasize;
3101         sector_t first_trk, last_trk;
3102         unsigned int pfx_datasize;
3103
3104         /*
3105          * raw track access needs to be mutiple of 64k and on 64k boundary
3106          */
3107         if ((blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK) != 0) {
3108                 cqr = ERR_PTR(-EINVAL);
3109                 goto out;
3110         }
3111         if (((blk_rq_pos(req) + blk_rq_sectors(req)) %
3112              DASD_RAW_SECTORS_PER_TRACK) != 0) {
3113                 cqr = ERR_PTR(-EINVAL);
3114                 goto out;
3115         }
3116
3117         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3118         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3119                 DASD_RAW_SECTORS_PER_TRACK;
3120         trkcount = last_trk - first_trk + 1;
3121         first_offs = 0;
3122         basedev = block->base;
3123
3124         if (rq_data_dir(req) == READ)
3125                 cmd = DASD_ECKD_CCW_READ_TRACK;
3126         else if (rq_data_dir(req) == WRITE)
3127                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3128         else {
3129                 cqr = ERR_PTR(-EINVAL);
3130                 goto out;
3131         }
3132
3133         /*
3134          * Raw track based I/O needs IDAWs for each page,
3135          * and not just for 64 bit addresses.
3136          */
3137         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3138
3139         /* 1x prefix + one read/write ccw per track */
3140         cplength = 1 + trkcount;
3141
3142         /*
3143          * struct PFX_eckd_data has up to 2 byte as extended parameter
3144          * this is needed for write full track and has to be mentioned
3145          * separately
3146          * add 8 instead of 2 to keep 8 byte boundary
3147          */
3148         pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
3149
3150         datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
3151
3152         /* Allocate the ccw request. */
3153         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3154                                    datasize, startdev);
3155         if (IS_ERR(cqr))
3156                 goto out;
3157         ccw = cqr->cpaddr;
3158
3159         if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
3160                        basedev, startdev, 1 /* format */, first_offs + 1,
3161                        trkcount, 0, 0) == -EAGAIN) {
3162                 /* Clock not in sync and XRC is enabled.
3163                  * Try again later.
3164                  */
3165                 dasd_sfree_request(cqr, startdev);
3166                 cqr = ERR_PTR(-EAGAIN);
3167                 goto out;
3168         }
3169
3170         idaws = (unsigned long *)(cqr->data + pfx_datasize);
3171
3172         len_to_track_end = 0;
3173
3174         rq_for_each_segment(bv, req, iter) {
3175                 dst = page_address(bv->bv_page) + bv->bv_offset;
3176                 seg_len = bv->bv_len;
3177                 if (!len_to_track_end) {
3178                         ccw[-1].flags |= CCW_FLAG_CC;
3179                         ccw->cmd_code = cmd;
3180                         /* maximum 3390 track size */
3181                         ccw->count = 57326;
3182                         /* 64k map to one track */
3183                         len_to_track_end = 65536;
3184                         ccw->cda = (__u32)(addr_t)idaws;
3185                         ccw->flags |= CCW_FLAG_IDA;
3186                         ccw->flags |= CCW_FLAG_SLI;
3187                         ccw++;
3188                 }
3189                 len_to_track_end -= seg_len;
3190                 idaws = idal_create_words(idaws, dst, seg_len);
3191         }
3192
3193         if (blk_noretry_request(req) ||
3194             block->base->features & DASD_FEATURE_FAILFAST)
3195                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3196         cqr->startdev = startdev;
3197         cqr->memdev = startdev;
3198         cqr->block = block;
3199         cqr->expires = startdev->default_expires * HZ;
3200         cqr->lpm = startdev->path_data.ppm;
3201         cqr->retries = 256;
3202         cqr->buildclk = get_clock();
3203         cqr->status = DASD_CQR_FILLED;
3204
3205         if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
3206                 cqr = NULL;
3207 out:
3208         return cqr;
3209 }
3210
3211
3212 static int
3213 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3214 {
3215         struct dasd_eckd_private *private;
3216         struct ccw1 *ccw;
3217         struct req_iterator iter;
3218         struct bio_vec *bv;
3219         char *dst, *cda;
3220         unsigned int blksize, blk_per_trk, off;
3221         sector_t recid;
3222         int status;
3223
3224         if (!dasd_page_cache)
3225                 goto out;
3226         private = (struct dasd_eckd_private *) cqr->block->base->private;
3227         blksize = cqr->block->bp_block;
3228         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3229         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3230         ccw = cqr->cpaddr;
3231         /* Skip over define extent & locate record. */
3232         ccw++;
3233         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3234                 ccw++;
3235         rq_for_each_segment(bv, req, iter) {
3236                 dst = page_address(bv->bv_page) + bv->bv_offset;
3237                 for (off = 0; off < bv->bv_len; off += blksize) {
3238                         /* Skip locate record. */
3239                         if (private->uses_cdl && recid <= 2*blk_per_trk)
3240                                 ccw++;
3241                         if (dst) {
3242                                 if (ccw->flags & CCW_FLAG_IDA)
3243                                         cda = *((char **)((addr_t) ccw->cda));
3244                                 else
3245                                         cda = (char *)((addr_t) ccw->cda);
3246                                 if (dst != cda) {
3247                                         if (rq_data_dir(req) == READ)
3248                                                 memcpy(dst, cda, bv->bv_len);
3249                                         kmem_cache_free(dasd_page_cache,
3250                                             (void *)((addr_t)cda & PAGE_MASK));
3251                                 }
3252                                 dst = NULL;
3253                         }
3254                         ccw++;
3255                         recid++;
3256                 }
3257         }
3258 out:
3259         status = cqr->status == DASD_CQR_DONE;
3260         dasd_sfree_request(cqr, cqr->memdev);
3261         return status;
3262 }
3263
3264 /*
3265  * Modify ccw/tcw in cqr so it can be started on a base device.
3266  *
3267  * Note that this is not enough to restart the cqr!
3268  * Either reset cqr->startdev as well (summary unit check handling)
3269  * or restart via separate cqr (as in ERP handling).
3270  */
3271 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3272 {
3273         struct ccw1 *ccw;
3274         struct PFX_eckd_data *pfxdata;
3275         struct tcw *tcw;
3276         struct tccb *tccb;
3277         struct dcw *dcw;
3278
3279         if (cqr->cpmode == 1) {
3280                 tcw = cqr->cpaddr;
3281                 tccb = tcw_get_tccb(tcw);
3282                 dcw = (struct dcw *)&tccb->tca[0];
3283                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
3284                 pfxdata->validity.verify_base = 0;
3285                 pfxdata->validity.hyper_pav = 0;
3286         } else {
3287                 ccw = cqr->cpaddr;
3288                 pfxdata = cqr->data;
3289                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
3290                         pfxdata->validity.verify_base = 0;
3291                         pfxdata->validity.hyper_pav = 0;
3292                 }
3293         }
3294 }
3295
3296 #define DASD_ECKD_CHANQ_MAX_SIZE 4
3297
3298 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
3299                                                      struct dasd_block *block,
3300                                                      struct request *req)
3301 {
3302         struct dasd_eckd_private *private;
3303         struct dasd_device *startdev;
3304         unsigned long flags;
3305         struct dasd_ccw_req *cqr;
3306
3307         startdev = dasd_alias_get_start_dev(base);
3308         if (!startdev)
3309                 startdev = base;
3310         private = (struct dasd_eckd_private *) startdev->private;
3311         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
3312                 return ERR_PTR(-EBUSY);
3313
3314         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
3315         private->count++;
3316         if ((base->features & DASD_FEATURE_USERAW))
3317                 cqr = dasd_raw_build_cp(startdev, block, req);
3318         else
3319                 cqr = dasd_eckd_build_cp(startdev, block, req);
3320         if (IS_ERR(cqr))
3321                 private->count--;
3322         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
3323         return cqr;
3324 }
3325
3326 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
3327                                    struct request *req)
3328 {
3329         struct dasd_eckd_private *private;
3330         unsigned long flags;
3331
3332         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
3333         private = (struct dasd_eckd_private *) cqr->memdev->private;
3334         private->count--;
3335         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
3336         return dasd_eckd_free_cp(cqr, req);
3337 }
3338
3339 static int
3340 dasd_eckd_fill_info(struct dasd_device * device,
3341                     struct dasd_information2_t * info)
3342 {
3343         struct dasd_eckd_private *private;
3344
3345         private = (struct dasd_eckd_private *) device->private;
3346         info->label_block = 2;
3347         info->FBA_layout = private->uses_cdl ? 0 : 1;
3348         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
3349         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
3350         memcpy(info->characteristics, &private->rdc_data,
3351                sizeof(struct dasd_eckd_characteristics));
3352         info->confdata_size = min((unsigned long)private->conf_len,
3353                                   sizeof(info->configuration_data));
3354         memcpy(info->configuration_data, private->conf_data,
3355                info->confdata_size);
3356         return 0;
3357 }
3358
3359 /*
3360  * SECTION: ioctl functions for eckd devices.
3361  */
3362
3363 /*
3364  * Release device ioctl.
3365  * Buils a channel programm to releases a prior reserved
3366  * (see dasd_eckd_reserve) device.
3367  */
3368 static int
3369 dasd_eckd_release(struct dasd_device *device)
3370 {
3371         struct dasd_ccw_req *cqr;
3372         int rc;
3373         struct ccw1 *ccw;
3374         int useglobal;
3375
3376         if (!capable(CAP_SYS_ADMIN))
3377                 return -EACCES;
3378
3379         useglobal = 0;
3380         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3381         if (IS_ERR(cqr)) {
3382                 mutex_lock(&dasd_reserve_mutex);
3383                 useglobal = 1;
3384                 cqr = &dasd_reserve_req->cqr;
3385                 memset(cqr, 0, sizeof(*cqr));
3386                 memset(&dasd_reserve_req->ccw, 0,
3387                        sizeof(dasd_reserve_req->ccw));
3388                 cqr->cpaddr = &dasd_reserve_req->ccw;
3389                 cqr->data = &dasd_reserve_req->data;
3390                 cqr->magic = DASD_ECKD_MAGIC;
3391         }
3392         ccw = cqr->cpaddr;
3393         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
3394         ccw->flags |= CCW_FLAG_SLI;
3395         ccw->count = 32;
3396         ccw->cda = (__u32)(addr_t) cqr->data;
3397         cqr->startdev = device;
3398         cqr->memdev = device;
3399         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3400         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3401         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3402         cqr->expires = 2 * HZ;
3403         cqr->buildclk = get_clock();
3404         cqr->status = DASD_CQR_FILLED;
3405
3406         rc = dasd_sleep_on_immediatly(cqr);
3407         if (!rc)
3408                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3409
3410         if (useglobal)
3411                 mutex_unlock(&dasd_reserve_mutex);
3412         else
3413                 dasd_sfree_request(cqr, cqr->memdev);
3414         return rc;
3415 }
3416
3417 /*
3418  * Reserve device ioctl.
3419  * Options are set to 'synchronous wait for interrupt' and
3420  * 'timeout the request'. This leads to a terminate IO if
3421  * the interrupt is outstanding for a certain time.
3422  */
3423 static int
3424 dasd_eckd_reserve(struct dasd_device *device)
3425 {
3426         struct dasd_ccw_req *cqr;
3427         int rc;
3428         struct ccw1 *ccw;
3429         int useglobal;
3430
3431         if (!capable(CAP_SYS_ADMIN))
3432                 return -EACCES;
3433
3434         useglobal = 0;
3435         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3436         if (IS_ERR(cqr)) {
3437                 mutex_lock(&dasd_reserve_mutex);
3438                 useglobal = 1;
3439                 cqr = &dasd_reserve_req->cqr;
3440                 memset(cqr, 0, sizeof(*cqr));
3441                 memset(&dasd_reserve_req->ccw, 0,
3442                        sizeof(dasd_reserve_req->ccw));
3443                 cqr->cpaddr = &dasd_reserve_req->ccw;
3444                 cqr->data = &dasd_reserve_req->data;
3445                 cqr->magic = DASD_ECKD_MAGIC;
3446         }
3447         ccw = cqr->cpaddr;
3448         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
3449         ccw->flags |= CCW_FLAG_SLI;
3450         ccw->count = 32;
3451         ccw->cda = (__u32)(addr_t) cqr->data;
3452         cqr->startdev = device;
3453         cqr->memdev = device;
3454         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3455         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3456         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3457         cqr->expires = 2 * HZ;
3458         cqr->buildclk = get_clock();
3459         cqr->status = DASD_CQR_FILLED;
3460
3461         rc = dasd_sleep_on_immediatly(cqr);
3462         if (!rc)
3463                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3464
3465         if (useglobal)
3466                 mutex_unlock(&dasd_reserve_mutex);
3467         else
3468                 dasd_sfree_request(cqr, cqr->memdev);
3469         return rc;
3470 }
3471
3472 /*
3473  * Steal lock ioctl - unconditional reserve device.
3474  * Buils a channel programm to break a device's reservation.
3475  * (unconditional reserve)
3476  */
3477 static int
3478 dasd_eckd_steal_lock(struct dasd_device *device)
3479 {
3480         struct dasd_ccw_req *cqr;
3481         int rc;
3482         struct ccw1 *ccw;
3483         int useglobal;
3484
3485         if (!capable(CAP_SYS_ADMIN))
3486                 return -EACCES;
3487
3488         useglobal = 0;
3489         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3490         if (IS_ERR(cqr)) {
3491                 mutex_lock(&dasd_reserve_mutex);
3492                 useglobal = 1;
3493                 cqr = &dasd_reserve_req->cqr;
3494                 memset(cqr, 0, sizeof(*cqr));
3495                 memset(&dasd_reserve_req->ccw, 0,
3496                        sizeof(dasd_reserve_req->ccw));
3497                 cqr->cpaddr = &dasd_reserve_req->ccw;
3498                 cqr->data = &dasd_reserve_req->data;
3499                 cqr->magic = DASD_ECKD_MAGIC;
3500         }
3501         ccw = cqr->cpaddr;
3502         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
3503         ccw->flags |= CCW_FLAG_SLI;
3504         ccw->count = 32;
3505         ccw->cda = (__u32)(addr_t) cqr->data;
3506         cqr->startdev = device;
3507         cqr->memdev = device;
3508         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3509         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3510         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3511         cqr->expires = 2 * HZ;
3512         cqr->buildclk = get_clock();
3513         cqr->status = DASD_CQR_FILLED;
3514
3515         rc = dasd_sleep_on_immediatly(cqr);
3516         if (!rc)
3517                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3518
3519         if (useglobal)
3520                 mutex_unlock(&dasd_reserve_mutex);
3521         else
3522                 dasd_sfree_request(cqr, cqr->memdev);
3523         return rc;
3524 }
3525
3526 /*
3527  * SNID - Sense Path Group ID
3528  * This ioctl may be used in situations where I/O is stalled due to
3529  * a reserve, so if the normal dasd_smalloc_request fails, we use the
3530  * preallocated dasd_reserve_req.
3531  */
3532 static int dasd_eckd_snid(struct dasd_device *device,
3533                           void __user *argp)
3534 {
3535         struct dasd_ccw_req *cqr;
3536         int rc;
3537         struct ccw1 *ccw;
3538         int useglobal;
3539         struct dasd_snid_ioctl_data usrparm;
3540
3541         if (!capable(CAP_SYS_ADMIN))
3542                 return -EACCES;
3543
3544         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3545                 return -EFAULT;
3546
3547         useglobal = 0;
3548         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
3549                                    sizeof(struct dasd_snid_data), device);
3550         if (IS_ERR(cqr)) {
3551                 mutex_lock(&dasd_reserve_mutex);
3552                 useglobal = 1;
3553                 cqr = &dasd_reserve_req->cqr;
3554                 memset(cqr, 0, sizeof(*cqr));
3555                 memset(&dasd_reserve_req->ccw, 0,
3556                        sizeof(dasd_reserve_req->ccw));
3557                 cqr->cpaddr = &dasd_reserve_req->ccw;
3558                 cqr->data = &dasd_reserve_req->data;
3559                 cqr->magic = DASD_ECKD_MAGIC;
3560         }
3561         ccw = cqr->cpaddr;
3562         ccw->cmd_code = DASD_ECKD_CCW_SNID;
3563         ccw->flags |= CCW_FLAG_SLI;
3564         ccw->count = 12;
3565         ccw->cda = (__u32)(addr_t) cqr->data;
3566         cqr->startdev = device;
3567         cqr->memdev = device;
3568         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3569         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3570         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
3571         cqr->retries = 5;
3572         cqr->expires = 10 * HZ;
3573         cqr->buildclk = get_clock();
3574         cqr->status = DASD_CQR_FILLED;
3575         cqr->lpm = usrparm.path_mask;
3576
3577         rc = dasd_sleep_on_immediatly(cqr);
3578         /* verify that I/O processing didn't modify the path mask */
3579         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
3580                 rc = -EIO;
3581         if (!rc) {
3582                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
3583                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
3584                         rc = -EFAULT;
3585         }
3586
3587         if (useglobal)
3588                 mutex_unlock(&dasd_reserve_mutex);
3589         else
3590                 dasd_sfree_request(cqr, cqr->memdev);
3591         return rc;
3592 }
3593
3594 /*
3595  * Read performance statistics
3596  */
3597 static int
3598 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
3599 {
3600         struct dasd_psf_prssd_data *prssdp;
3601         struct dasd_rssd_perf_stats_t *stats;
3602         struct dasd_ccw_req *cqr;
3603         struct ccw1 *ccw;
3604         int rc;
3605
3606         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
3607                                    (sizeof(struct dasd_psf_prssd_data) +
3608                                     sizeof(struct dasd_rssd_perf_stats_t)),
3609                                    device);
3610         if (IS_ERR(cqr)) {
3611                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3612                             "Could not allocate initialization request");
3613                 return PTR_ERR(cqr);
3614         }
3615         cqr->startdev = device;
3616         cqr->memdev = device;
3617         cqr->retries = 0;
3618         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3619         cqr->expires = 10 * HZ;
3620
3621         /* Prepare for Read Subsystem Data */
3622         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3623         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
3624         prssdp->order = PSF_ORDER_PRSSD;
3625         prssdp->suborder = 0x01;        /* Performance Statistics */
3626         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
3627
3628         ccw = cqr->cpaddr;
3629         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3630         ccw->count = sizeof(struct dasd_psf_prssd_data);
3631         ccw->flags |= CCW_FLAG_CC;
3632         ccw->cda = (__u32)(addr_t) prssdp;
3633
3634         /* Read Subsystem Data - Performance Statistics */
3635         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3636         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
3637
3638         ccw++;
3639         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3640         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
3641         ccw->cda = (__u32)(addr_t) stats;
3642
3643         cqr->buildclk = get_clock();
3644         cqr->status = DASD_CQR_FILLED;
3645         rc = dasd_sleep_on(cqr);
3646         if (rc == 0) {
3647                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3648                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3649                 if (copy_to_user(argp, stats,
3650                                  sizeof(struct dasd_rssd_perf_stats_t)))
3651                         rc = -EFAULT;
3652         }
3653         dasd_sfree_request(cqr, cqr->memdev);
3654         return rc;
3655 }
3656
3657 /*
3658  * Get attributes (cache operations)
3659  * Returnes the cache attributes used in Define Extend (DE).
3660  */
3661 static int
3662 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
3663 {
3664         struct dasd_eckd_private *private =
3665                 (struct dasd_eckd_private *)device->private;
3666         struct attrib_data_t attrib = private->attrib;
3667         int rc;
3668
3669         if (!capable(CAP_SYS_ADMIN))
3670                 return -EACCES;
3671         if (!argp)
3672                 return -EINVAL;
3673
3674         rc = 0;
3675         if (copy_to_user(argp, (long *) &attrib,
3676                          sizeof(struct attrib_data_t)))
3677                 rc = -EFAULT;
3678
3679         return rc;
3680 }
3681
3682 /*
3683  * Set attributes (cache operations)
3684  * Stores the attributes for cache operation to be used in Define Extend (DE).
3685  */
3686 static int
3687 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
3688 {
3689         struct dasd_eckd_private *private =
3690                 (struct dasd_eckd_private *)device->private;
3691         struct attrib_data_t attrib;
3692
3693         if (!capable(CAP_SYS_ADMIN))
3694                 return -EACCES;
3695         if (!argp)
3696                 return -EINVAL;
3697
3698         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
3699                 return -EFAULT;
3700         private->attrib = attrib;
3701
3702         dev_info(&device->cdev->dev,
3703                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
3704                  private->attrib.operation, private->attrib.nr_cyl);
3705         return 0;
3706 }
3707
3708 /*
3709  * Issue syscall I/O to EMC Symmetrix array.
3710  * CCWs are PSF and RSSD
3711  */
3712 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
3713 {
3714         struct dasd_symmio_parms usrparm;
3715         char *psf_data, *rssd_result;
3716         struct dasd_ccw_req *cqr;
3717         struct ccw1 *ccw;
3718         char psf0, psf1;
3719         int rc;
3720
3721         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
3722                 return -EACCES;
3723         psf0 = psf1 = 0;
3724
3725         /* Copy parms from caller */
3726         rc = -EFAULT;
3727         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3728                 goto out;
3729         if (is_compat_task() || sizeof(long) == 4) {
3730                 /* Make sure pointers are sane even on 31 bit. */
3731                 rc = -EINVAL;
3732                 if ((usrparm.psf_data >> 32) != 0)
3733                         goto out;
3734                 if ((usrparm.rssd_result >> 32) != 0)
3735                         goto out;
3736                 usrparm.psf_data &= 0x7fffffffULL;
3737                 usrparm.rssd_result &= 0x7fffffffULL;
3738         }
3739         /* alloc I/O data area */
3740         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
3741         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
3742         if (!psf_data || !rssd_result) {
3743                 rc = -ENOMEM;
3744                 goto out_free;
3745         }
3746
3747         /* get syscall header from user space */
3748         rc = -EFAULT;
3749         if (copy_from_user(psf_data,
3750                            (void __user *)(unsigned long) usrparm.psf_data,
3751                            usrparm.psf_data_len))
3752                 goto out_free;
3753         psf0 = psf_data[0];
3754         psf1 = psf_data[1];
3755
3756         /* setup CCWs for PSF + RSSD */
3757         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
3758         if (IS_ERR(cqr)) {
3759                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3760                         "Could not allocate initialization request");
3761                 rc = PTR_ERR(cqr);
3762                 goto out_free;
3763         }
3764
3765         cqr->startdev = device;
3766         cqr->memdev = device;
3767         cqr->retries = 3;
3768         cqr->expires = 10 * HZ;
3769         cqr->buildclk = get_clock();
3770         cqr->status = DASD_CQR_FILLED;
3771
3772         /* Build the ccws */
3773         ccw = cqr->cpaddr;
3774
3775         /* PSF ccw */
3776         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3777         ccw->count = usrparm.psf_data_len;
3778         ccw->flags |= CCW_FLAG_CC;
3779         ccw->cda = (__u32)(addr_t) psf_data;
3780
3781         ccw++;
3782
3783         /* RSSD ccw  */
3784         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3785         ccw->count = usrparm.rssd_result_len;
3786         ccw->flags = CCW_FLAG_SLI ;
3787         ccw->cda = (__u32)(addr_t) rssd_result;
3788
3789         rc = dasd_sleep_on(cqr);
3790         if (rc)
3791                 goto out_sfree;
3792
3793         rc = -EFAULT;
3794         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
3795                            rssd_result, usrparm.rssd_result_len))
3796                 goto out_sfree;
3797         rc = 0;
3798
3799 out_sfree:
3800         dasd_sfree_request(cqr, cqr->memdev);
3801 out_free:
3802         kfree(rssd_result);
3803         kfree(psf_data);
3804 out:
3805         DBF_DEV_EVENT(DBF_WARNING, device,
3806                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
3807                       (int) psf0, (int) psf1, rc);
3808         return rc;
3809 }
3810
3811 static int
3812 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
3813 {
3814         struct dasd_device *device = block->base;
3815
3816         switch (cmd) {
3817         case BIODASDGATTR:
3818                 return dasd_eckd_get_attrib(device, argp);
3819         case BIODASDSATTR:
3820                 return dasd_eckd_set_attrib(device, argp);
3821         case BIODASDPSRD:
3822                 return dasd_eckd_performance(device, argp);
3823         case BIODASDRLSE:
3824                 return dasd_eckd_release(device);
3825         case BIODASDRSRV:
3826                 return dasd_eckd_reserve(device);
3827         case BIODASDSLCK:
3828                 return dasd_eckd_steal_lock(device);
3829         case BIODASDSNID:
3830                 return dasd_eckd_snid(device, argp);
3831         case BIODASDSYMMIO:
3832                 return dasd_symm_io(device, argp);
3833         default:
3834                 return -ENOTTY;
3835         }
3836 }
3837
3838 /*
3839  * Dump the range of CCWs into 'page' buffer
3840  * and return number of printed chars.
3841  */
3842 static int
3843 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
3844 {
3845         int len, count;
3846         char *datap;
3847
3848         len = 0;
3849         while (from <= to) {
3850                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3851                                " CCW %p: %08X %08X DAT:",
3852                                from, ((int *) from)[0], ((int *) from)[1]);
3853
3854                 /* get pointer to data (consider IDALs) */
3855                 if (from->flags & CCW_FLAG_IDA)
3856                         datap = (char *) *((addr_t *) (addr_t) from->cda);
3857                 else
3858                         datap = (char *) ((addr_t) from->cda);
3859
3860                 /* dump data (max 32 bytes) */
3861                 for (count = 0; count < from->count && count < 32; count++) {
3862                         if (count % 8 == 0) len += sprintf(page + len, " ");
3863                         if (count % 4 == 0) len += sprintf(page + len, " ");
3864                         len += sprintf(page + len, "%02x", datap[count]);
3865                 }
3866                 len += sprintf(page + len, "\n");
3867                 from++;
3868         }
3869         return len;
3870 }
3871
3872 static void
3873 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
3874                          char *reason)
3875 {
3876         u64 *sense;
3877         u64 *stat;
3878
3879         sense = (u64 *) dasd_get_sense(irb);
3880         stat = (u64 *) &irb->scsw;
3881         if (sense) {
3882                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
3883                               "%016llx %016llx %016llx %016llx",
3884                               reason, *stat, *((u32 *) (stat + 1)),
3885                               sense[0], sense[1], sense[2], sense[3]);
3886         } else {
3887                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
3888                               reason, *stat, *((u32 *) (stat + 1)),
3889                               "NO VALID SENSE");
3890         }
3891 }
3892
3893 /*
3894  * Print sense data and related channel program.
3895  * Parts are printed because printk buffer is only 1024 bytes.
3896  */
3897 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
3898                                  struct dasd_ccw_req *req, struct irb *irb)
3899 {
3900         char *page;
3901         struct ccw1 *first, *last, *fail, *from, *to;
3902         int len, sl, sct;
3903
3904         page = (char *) get_zeroed_page(GFP_ATOMIC);
3905         if (page == NULL) {
3906                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3907                               "No memory to dump sense data\n");
3908                 return;
3909         }
3910         /* dump the sense data */
3911         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3912                       " I/O status report for device %s:\n",
3913                       dev_name(&device->cdev->dev));
3914         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3915                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
3916                        "CS:%02X RC:%d\n",
3917                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
3918                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
3919                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
3920                        req ? req->intrc : 0);
3921         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3922                        " device %s: Failing CCW: %p\n",
3923                        dev_name(&device->cdev->dev),
3924                        (void *) (addr_t) irb->scsw.cmd.cpa);
3925         if (irb->esw.esw0.erw.cons) {
3926                 for (sl = 0; sl < 4; sl++) {
3927                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3928                                        " Sense(hex) %2d-%2d:",
3929                                        (8 * sl), ((8 * sl) + 7));
3930
3931                         for (sct = 0; sct < 8; sct++) {
3932                                 len += sprintf(page + len, " %02x",
3933                                                irb->ecw[8 * sl + sct]);
3934                         }
3935                         len += sprintf(page + len, "\n");
3936                 }
3937
3938                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
3939                         /* 24 Byte Sense Data */
3940                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3941                                 " 24 Byte: %x MSG %x, "
3942                                 "%s MSGb to SYSOP\n",
3943                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
3944                                 irb->ecw[1] & 0x10 ? "" : "no");
3945                 } else {
3946                         /* 32 Byte Sense Data */
3947                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3948                                 " 32 Byte: Format: %x "
3949                                 "Exception class %x\n",
3950                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
3951                 }
3952         } else {
3953                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3954                         " SORRY - NO VALID SENSE AVAILABLE\n");
3955         }
3956         printk("%s", page);
3957
3958         if (req) {
3959                 /* req == NULL for unsolicited interrupts */
3960                 /* dump the Channel Program (max 140 Bytes per line) */
3961                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
3962                 first = req->cpaddr;
3963                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
3964                 to = min(first + 6, last);
3965                 len = sprintf(page,  KERN_ERR PRINTK_HEADER
3966                               " Related CP in req: %p\n", req);
3967                 dasd_eckd_dump_ccw_range(first, to, page + len);
3968                 printk("%s", page);
3969
3970                 /* print failing CCW area (maximum 4) */
3971                 /* scsw->cda is either valid or zero  */
3972                 len = 0;
3973                 from = ++to;
3974                 fail = (struct ccw1 *)(addr_t)
3975                                 irb->scsw.cmd.cpa; /* failing CCW */
3976                 if (from <  fail - 2) {
3977                         from = fail - 2;     /* there is a gap - print header */
3978                         len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
3979                 }
3980                 to = min(fail + 1, last);
3981                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
3982
3983                 /* print last CCWs (maximum 2) */
3984                 from = max(from, ++to);
3985                 if (from < last - 1) {
3986                         from = last - 1;     /* there is a gap - print header */
3987                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
3988                 }
3989                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
3990                 if (len > 0)
3991                         printk("%s", page);
3992         }
3993         free_page((unsigned long) page);
3994 }
3995
3996
3997 /*
3998  * Print sense data from a tcw.
3999  */
4000 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4001                                  struct dasd_ccw_req *req, struct irb *irb)
4002 {
4003         char *page;
4004         int len, sl, sct, residual;
4005         struct tsb *tsb;
4006         u8 *sense, *rcq;
4007
4008         page = (char *) get_zeroed_page(GFP_ATOMIC);
4009         if (page == NULL) {
4010                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4011                             "No memory to dump sense data");
4012                 return;
4013         }
4014         /* dump the sense data */
4015         len = sprintf(page,  KERN_ERR PRINTK_HEADER
4016                       " I/O status report for device %s:\n",
4017                       dev_name(&device->cdev->dev));
4018         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4019                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4020                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4021                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4022                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4023                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4024                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
4025                        req ? req->intrc : 0);
4026         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4027                        " device %s: Failing TCW: %p\n",
4028                        dev_name(&device->cdev->dev),
4029                        (void *) (addr_t) irb->scsw.tm.tcw);
4030
4031         tsb = NULL;
4032         sense = NULL;
4033         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4034                 tsb = tcw_get_tsb(
4035                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4036
4037         if (tsb) {
4038                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4039                                " tsb->length %d\n", tsb->length);
4040                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4041                                " tsb->flags %x\n", tsb->flags);
4042                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4043                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
4044                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4045                                " tsb->count %d\n", tsb->count);
4046                 residual = tsb->count - 28;
4047                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4048                                " residual %d\n", residual);
4049
4050                 switch (tsb->flags & 0x07) {
4051                 case 1: /* tsa_iostat */
4052                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4053                                " tsb->tsa.iostat.dev_time %d\n",
4054                                        tsb->tsa.iostat.dev_time);
4055                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4056                                " tsb->tsa.iostat.def_time %d\n",
4057                                        tsb->tsa.iostat.def_time);
4058                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4059                                " tsb->tsa.iostat.queue_time %d\n",
4060                                        tsb->tsa.iostat.queue_time);
4061                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4062                                " tsb->tsa.iostat.dev_busy_time %d\n",
4063                                        tsb->tsa.iostat.dev_busy_time);
4064                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4065                                " tsb->tsa.iostat.dev_act_time %d\n",
4066                                        tsb->tsa.iostat.dev_act_time);
4067                         sense = tsb->tsa.iostat.sense;
4068                         break;
4069                 case 2: /* ts_ddpc */
4070                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4071                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4072                         for (sl = 0; sl < 2; sl++) {
4073                                 len += sprintf(page + len,
4074                                                KERN_ERR PRINTK_HEADER
4075                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
4076                                                (8 * sl), ((8 * sl) + 7));
4077                                 rcq = tsb->tsa.ddpc.rcq;
4078                                 for (sct = 0; sct < 8; sct++) {
4079                                         len += sprintf(page + len, " %02x",
4080                                                        rcq[8 * sl + sct]);
4081                                 }
4082                                 len += sprintf(page + len, "\n");
4083                         }
4084                         sense = tsb->tsa.ddpc.sense;
4085                         break;
4086                 case 3: /* tsa_intrg */
4087                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4088                                       " tsb->tsa.intrg.: not supportet yet \n");
4089                         break;
4090                 }
4091
4092                 if (sense) {
4093                         for (sl = 0; sl < 4; sl++) {
4094                                 len += sprintf(page + len,
4095                                                KERN_ERR PRINTK_HEADER
4096                                                " Sense(hex) %2d-%2d:",
4097                                                (8 * sl), ((8 * sl) + 7));
4098                                 for (sct = 0; sct < 8; sct++) {
4099                                         len += sprintf(page + len, " %02x",
4100                                                        sense[8 * sl + sct]);
4101                                 }
4102                                 len += sprintf(page + len, "\n");
4103                         }
4104
4105                         if (sense[27] & DASD_SENSE_BIT_0) {
4106                                 /* 24 Byte Sense Data */
4107                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
4108                                         " 24 Byte: %x MSG %x, "
4109                                         "%s MSGb to SYSOP\n",
4110                                         sense[7] >> 4, sense[7] & 0x0f,
4111                                         sense[1] & 0x10 ? "" : "no");
4112                         } else {
4113                                 /* 32 Byte Sense Data */
4114                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
4115                                         " 32 Byte: Format: %x "
4116                                         "Exception class %x\n",
4117                                         sense[6] & 0x0f, sense[22] >> 4);
4118                         }
4119                 } else {
4120                         sprintf(page + len, KERN_ERR PRINTK_HEADER
4121                                 " SORRY - NO VALID SENSE AVAILABLE\n");
4122                 }
4123         } else {
4124                 sprintf(page + len, KERN_ERR PRINTK_HEADER
4125                         " SORRY - NO TSB DATA AVAILABLE\n");
4126         }
4127         printk("%s", page);
4128         free_page((unsigned long) page);
4129 }
4130
4131 static void dasd_eckd_dump_sense(struct dasd_device *device,
4132                                  struct dasd_ccw_req *req, struct irb *irb)
4133 {
4134         if (scsw_is_tm(&irb->scsw))
4135                 dasd_eckd_dump_sense_tcw(device, req, irb);
4136         else
4137                 dasd_eckd_dump_sense_ccw(device, req, irb);
4138 }
4139
4140 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4141 {
4142         /*
4143          * the device should be disconnected from our LCU structure
4144          * on restore we will reconnect it and reread LCU specific
4145          * information like PAV support that might have changed
4146          */
4147         dasd_alias_remove_device(device);
4148         dasd_alias_disconnect_device_from_lcu(device);
4149
4150         return 0;
4151 }
4152
4153 static int dasd_eckd_restore_device(struct dasd_device *device)
4154 {
4155         struct dasd_eckd_private *private;
4156         struct dasd_eckd_characteristics temp_rdc_data;
4157         int rc;
4158         struct dasd_uid temp_uid;
4159         unsigned long flags;
4160
4161         private = (struct dasd_eckd_private *) device->private;
4162
4163         /* Read Configuration Data */
4164         rc = dasd_eckd_read_conf(device);
4165         if (rc)
4166                 goto out_err;
4167
4168         dasd_eckd_get_uid(device, &temp_uid);
4169         /* Generate device unique id */
4170         rc = dasd_eckd_generate_uid(device);
4171         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4172         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4173                 dev_err(&device->cdev->dev, "The UID of the DASD has "
4174                         "changed\n");
4175         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4176         if (rc)
4177                 goto out_err;
4178
4179         /* register lcu with alias handling, enable PAV if this is a new lcu */
4180         rc = dasd_alias_make_device_known_to_lcu(device);
4181         if (rc)
4182                 return rc;
4183         dasd_eckd_validate_server(device, DASD_CQR_FLAGS_FAILFAST);
4184
4185         /* RE-Read Configuration Data */
4186         rc = dasd_eckd_read_conf(device);
4187         if (rc)
4188                 goto out_err;
4189
4190         /* Read Feature Codes */
4191         dasd_eckd_read_features(device);
4192
4193         /* Read Device Characteristics */
4194         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4195                                          &temp_rdc_data, 64);
4196         if (rc) {
4197                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4198                                 "Read device characteristic failed, rc=%d", rc);
4199                 goto out_err;
4200         }
4201         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4202         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4203         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4204
4205         /* add device to alias management */
4206         dasd_alias_add_device(device);
4207
4208         return 0;
4209
4210 out_err:
4211         return -1;
4212 }
4213
4214 static int dasd_eckd_reload_device(struct dasd_device *device)
4215 {
4216         struct dasd_eckd_private *private;
4217         int rc, old_base;
4218         char print_uid[60];
4219         struct dasd_uid uid;
4220         unsigned long flags;
4221
4222         private = (struct dasd_eckd_private *) device->private;
4223
4224         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4225         old_base = private->uid.base_unit_addr;
4226         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4227
4228         /* Read Configuration Data */
4229         rc = dasd_eckd_read_conf(device);
4230         if (rc)
4231                 goto out_err;
4232
4233         rc = dasd_eckd_generate_uid(device);
4234         if (rc)
4235                 goto out_err;
4236         /*
4237          * update unit address configuration and
4238          * add device to alias management
4239          */
4240         dasd_alias_update_add_device(device);
4241
4242         dasd_eckd_get_uid(device, &uid);
4243
4244         if (old_base != uid.base_unit_addr) {
4245                 if (strlen(uid.vduit) > 0)
4246                         snprintf(print_uid, sizeof(print_uid),
4247                                  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
4248                                  uid.ssid, uid.base_unit_addr, uid.vduit);
4249                 else
4250                         snprintf(print_uid, sizeof(print_uid),
4251                                  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
4252                                  uid.ssid, uid.base_unit_addr);
4253
4254                 dev_info(&device->cdev->dev,
4255                          "An Alias device was reassigned to a new base device "
4256                          "with UID: %s\n", print_uid);
4257         }
4258         return 0;
4259
4260 out_err:
4261         return -1;
4262 }
4263
4264 static struct ccw_driver dasd_eckd_driver = {
4265         .driver = {
4266                 .name   = "dasd-eckd",
4267                 .owner  = THIS_MODULE,
4268         },
4269         .ids         = dasd_eckd_ids,
4270         .probe       = dasd_eckd_probe,
4271         .remove      = dasd_generic_remove,
4272         .set_offline = dasd_generic_set_offline,
4273         .set_online  = dasd_eckd_set_online,
4274         .notify      = dasd_generic_notify,
4275         .path_event  = dasd_generic_path_event,
4276         .shutdown    = dasd_generic_shutdown,
4277         .freeze      = dasd_generic_pm_freeze,
4278         .thaw        = dasd_generic_restore_device,
4279         .restore     = dasd_generic_restore_device,
4280         .uc_handler  = dasd_generic_uc_handler,
4281         .int_class   = IOINT_DAS,
4282 };
4283
4284 /*
4285  * max_blocks is dependent on the amount of storage that is available
4286  * in the static io buffer for each device. Currently each device has
4287  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
4288  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
4289  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
4290  * addition we have one define extent ccw + 16 bytes of data and one
4291  * locate record ccw + 16 bytes of data. That makes:
4292  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
4293  * We want to fit two into the available memory so that we can immediately
4294  * start the next request if one finishes off. That makes 249.5 blocks
4295  * for one request. Give a little safety and the result is 240.
4296  */
4297 static struct dasd_discipline dasd_eckd_discipline = {
4298         .owner = THIS_MODULE,
4299         .name = "ECKD",
4300         .ebcname = "ECKD",
4301         .max_blocks = 190,
4302         .check_device = dasd_eckd_check_characteristics,
4303         .uncheck_device = dasd_eckd_uncheck_device,
4304         .do_analysis = dasd_eckd_do_analysis,
4305         .verify_path = dasd_eckd_verify_path,
4306         .ready_to_online = dasd_eckd_ready_to_online,
4307         .online_to_ready = dasd_eckd_online_to_ready,
4308         .fill_geometry = dasd_eckd_fill_geometry,
4309         .start_IO = dasd_start_IO,
4310         .term_IO = dasd_term_IO,
4311         .handle_terminated_request = dasd_eckd_handle_terminated_request,
4312         .format_device = dasd_eckd_format_device,
4313         .erp_action = dasd_eckd_erp_action,
4314         .erp_postaction = dasd_eckd_erp_postaction,
4315         .check_for_device_change = dasd_eckd_check_for_device_change,
4316         .build_cp = dasd_eckd_build_alias_cp,
4317         .free_cp = dasd_eckd_free_alias_cp,
4318         .dump_sense = dasd_eckd_dump_sense,
4319         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
4320         .fill_info = dasd_eckd_fill_info,
4321         .ioctl = dasd_eckd_ioctl,
4322         .freeze = dasd_eckd_pm_freeze,
4323         .restore = dasd_eckd_restore_device,
4324         .reload = dasd_eckd_reload_device,
4325         .get_uid = dasd_eckd_get_uid,
4326         .kick_validate = dasd_eckd_kick_validate_server,
4327 };
4328
4329 static int __init
4330 dasd_eckd_init(void)
4331 {
4332         int ret;
4333
4334         ASCEBC(dasd_eckd_discipline.ebcname, 4);
4335         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
4336                                    GFP_KERNEL | GFP_DMA);
4337         if (!dasd_reserve_req)
4338                 return -ENOMEM;
4339         path_verification_worker = kmalloc(sizeof(*path_verification_worker),
4340                                    GFP_KERNEL | GFP_DMA);
4341         if (!path_verification_worker) {
4342                 kfree(dasd_reserve_req);
4343                 return -ENOMEM;
4344         }
4345         ret = ccw_driver_register(&dasd_eckd_driver);
4346         if (!ret)
4347                 wait_for_device_probe();
4348         else {
4349                 kfree(path_verification_worker);
4350                 kfree(dasd_reserve_req);
4351         }
4352         return ret;
4353 }
4354
4355 static void __exit
4356 dasd_eckd_cleanup(void)
4357 {
4358         ccw_driver_unregister(&dasd_eckd_driver);
4359         kfree(path_verification_worker);
4360         kfree(dasd_reserve_req);
4361 }
4362
4363 module_init(dasd_eckd_init);
4364 module_exit(dasd_eckd_cleanup);