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