git.oblomov.eu Git - linux-2.6/blob - drivers/s390/block/dasd_eckd.c

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_eckd.c
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5  *                  Carsten Otte <Cotte@de.ibm.com>
   6  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  * Bugreports.to..: <Linux390@de.ibm.com>
   8  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
   9  *
  10  */
  11
  12 #include <linux/stddef.h>
  13 #include <linux/kernel.h>
  14 #include <linux/slab.h>
  15 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  16 #include <linux/bio.h>
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19
  20 #include <asm/debug.h>
  21 #include <asm/idals.h>
  22 #include <asm/ebcdic.h>
  23 #include <asm/io.h>
  24 #include <asm/todclk.h>
  25 #include <asm/uaccess.h>
  26 #include <asm/cio.h>
  27 #include <asm/ccwdev.h>
  28
  29 #include "dasd_int.h"
  30 #include "dasd_eckd.h"
  31
  32 #ifdef PRINTK_HEADER
  33 #undef PRINTK_HEADER
  34 #endif                          /* PRINTK_HEADER */
  35 #define PRINTK_HEADER "dasd(eckd):"
  36
  37 #define ECKD_C0(i) (i->home_bytes)
  38 #define ECKD_F(i) (i->formula)
  39 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
  40                     (i->factors.f_0x02.f1))
  41 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
  42                     (i->factors.f_0x02.f2))
  43 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
  44                     (i->factors.f_0x02.f3))
  45 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
  46 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
  47 #define ECKD_F6(i) (i->factor6)
  48 #define ECKD_F7(i) (i->factor7)
  49 #define ECKD_F8(i) (i->factor8)
  50
  51 MODULE_LICENSE("GPL");
  52
  53 static struct dasd_discipline dasd_eckd_discipline;
  54
  55 /* The ccw bus type uses this table to find devices that it sends to
  56  * dasd_eckd_probe */
  57 static struct ccw_device_id dasd_eckd_ids[] = {
  58         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
  59         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
  60         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3390, 0), .driver_info = 0x3},
  61         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
  62         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
  63         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
  64         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
  65         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
  66         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
  67         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
  68         { /* end of list */ },
  69 };
  70
  71 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  72
  73 static struct ccw_driver dasd_eckd_driver; /* see below */
  74
  75 /* initial attempt at a probe function. this can be simplified once
  76  * the other detection code is gone */
  77 static int
  78 dasd_eckd_probe (struct ccw_device *cdev)
  79 {
  80         int ret;
  81
  82         /* set ECKD specific ccw-device options */
  83         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE);
  84         if (ret) {
  85                 printk(KERN_WARNING
  86                        "dasd_eckd_probe: could not set ccw-device options "
  87                        "for %s\n", cdev->dev.bus_id);
  88                 return ret;
  89         }
  90         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
  91         return ret;
  92 }
  93
  94 static int
  95 dasd_eckd_set_online(struct ccw_device *cdev)
  96 {
  97         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
  98 }
  99
 100 static struct ccw_driver dasd_eckd_driver = {
 101         .name        = "dasd-eckd",
 102         .owner       = THIS_MODULE,
 103         .ids         = dasd_eckd_ids,
 104         .probe       = dasd_eckd_probe,
 105         .remove      = dasd_generic_remove,
 106         .set_offline = dasd_generic_set_offline,
 107         .set_online  = dasd_eckd_set_online,
 108         .notify      = dasd_generic_notify,
 109 };
 110
 111 static const int sizes_trk0[] = { 28, 148, 84 };
 112 #define LABEL_SIZE 140
 113
 114 static inline unsigned int
 115 round_up_multiple(unsigned int no, unsigned int mult)
 116 {
 117         int rem = no % mult;
 118         return (rem ? no - rem + mult : no);
 119 }
 120
 121 static inline unsigned int
 122 ceil_quot(unsigned int d1, unsigned int d2)
 123 {
 124         return (d1 + (d2 - 1)) / d2;
 125 }
 126
 127 static unsigned int
 128 recs_per_track(struct dasd_eckd_characteristics * rdc,
 129                unsigned int kl, unsigned int dl)
 130 {
 131         int dn, kn;
 132
 133         switch (rdc->dev_type) {
 134         case 0x3380:
 135                 if (kl)
 136                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 137                                        ceil_quot(dl + 12, 32));
 138                 else
 139                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 140         case 0x3390:
 141                 dn = ceil_quot(dl + 6, 232) + 1;
 142                 if (kl) {
 143                         kn = ceil_quot(kl + 6, 232) + 1;
 144                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 145                                        9 + ceil_quot(dl + 6 * dn, 34));
 146                 } else
 147                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 148         case 0x9345:
 149                 dn = ceil_quot(dl + 6, 232) + 1;
 150                 if (kl) {
 151                         kn = ceil_quot(kl + 6, 232) + 1;
 152                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 153                                        ceil_quot(dl + 6 * dn, 34));
 154                 } else
 155                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 156         }
 157         return 0;
 158 }
 159
 160 static int
 161 check_XRC (struct ccw1         *de_ccw,
 162            struct DE_eckd_data *data,
 163            struct dasd_device  *device)
 164 {
 165         struct dasd_eckd_private *private;
 166         int rc;
 167
 168         private = (struct dasd_eckd_private *) device->private;
 169         if (!private->rdc_data.facilities.XRC_supported)
 170                 return 0;
 171
 172         /* switch on System Time Stamp - needed for XRC Support */
 173         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 174         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 175
 176         rc = get_sync_clock(&data->ep_sys_time);
 177         /* Ignore return code if sync clock is switched off. */
 178         if (rc == -ENOSYS || rc == -EACCES)
 179                 rc = 0;
 180
 181         de_ccw->count = sizeof(struct DE_eckd_data);
 182         de_ccw->flags |= CCW_FLAG_SLI;
 183         return rc;
 184 }
 185
 186 static int
 187 define_extent(struct ccw1 * ccw, struct DE_eckd_data * data, int trk,
 188               int totrk, int cmd, struct dasd_device * device)
 189 {
 190         struct dasd_eckd_private *private;
 191         struct ch_t geo, beg, end;
 192         int rc = 0;
 193
 194         private = (struct dasd_eckd_private *) device->private;
 195
 196         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 197         ccw->flags = 0;
 198         ccw->count = 16;
 199         ccw->cda = (__u32) __pa(data);
 200
 201         memset(data, 0, sizeof(struct DE_eckd_data));
 202         switch (cmd) {
 203         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 204         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 205         case DASD_ECKD_CCW_READ:
 206         case DASD_ECKD_CCW_READ_MT:
 207         case DASD_ECKD_CCW_READ_CKD:
 208         case DASD_ECKD_CCW_READ_CKD_MT:
 209         case DASD_ECKD_CCW_READ_KD:
 210         case DASD_ECKD_CCW_READ_KD_MT:
 211         case DASD_ECKD_CCW_READ_COUNT:
 212                 data->mask.perm = 0x1;
 213                 data->attributes.operation = private->attrib.operation;
 214                 break;
 215         case DASD_ECKD_CCW_WRITE:
 216         case DASD_ECKD_CCW_WRITE_MT:
 217         case DASD_ECKD_CCW_WRITE_KD:
 218         case DASD_ECKD_CCW_WRITE_KD_MT:
 219                 data->mask.perm = 0x02;
 220                 data->attributes.operation = private->attrib.operation;
 221                 rc = check_XRC (ccw, data, device);
 222                 break;
 223         case DASD_ECKD_CCW_WRITE_CKD:
 224         case DASD_ECKD_CCW_WRITE_CKD_MT:
 225                 data->attributes.operation = DASD_BYPASS_CACHE;
 226                 rc = check_XRC (ccw, data, device);
 227                 break;
 228         case DASD_ECKD_CCW_ERASE:
 229         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 230         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 231                 data->mask.perm = 0x3;
 232                 data->mask.auth = 0x1;
 233                 data->attributes.operation = DASD_BYPASS_CACHE;
 234                 rc = check_XRC (ccw, data, device);
 235                 break;
 236         default:
 237                 DEV_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", cmd);
 238                 break;
 239         }
 240
 241         data->attributes.mode = 0x3;    /* ECKD */
 242
 243         if ((private->rdc_data.cu_type == 0x2105 ||
 244              private->rdc_data.cu_type == 0x2107 ||
 245              private->rdc_data.cu_type == 0x1750)
 246             && !(private->uses_cdl && trk < 2))
 247                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 248
 249         geo.cyl = private->rdc_data.no_cyl;
 250         geo.head = private->rdc_data.trk_per_cyl;
 251         beg.cyl = trk / geo.head;
 252         beg.head = trk % geo.head;
 253         end.cyl = totrk / geo.head;
 254         end.head = totrk % geo.head;
 255
 256         /* check for sequential prestage - enhance cylinder range */
 257         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 258             data->attributes.operation == DASD_SEQ_ACCESS) {
 259
 260                 if (end.cyl + private->attrib.nr_cyl < geo.cyl)
 261                         end.cyl += private->attrib.nr_cyl;
 262                 else
 263                         end.cyl = (geo.cyl - 1);
 264         }
 265
 266         data->beg_ext.cyl = beg.cyl;
 267         data->beg_ext.head = beg.head;
 268         data->end_ext.cyl = end.cyl;
 269         data->end_ext.head = end.head;
 270         return rc;
 271 }
 272
 273 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
 274                                struct dasd_device  *device)
 275 {
 276         struct dasd_eckd_private *private;
 277         int rc;
 278
 279         private = (struct dasd_eckd_private *) device->private;
 280         if (!private->rdc_data.facilities.XRC_supported)
 281                 return 0;
 282
 283         /* switch on System Time Stamp - needed for XRC Support */
 284         pfxdata->define_extend.ga_extended |= 0x08; /* 'Time Stamp Valid'   */
 285         pfxdata->define_extend.ga_extended |= 0x02; /* 'Extended Parameter' */
 286         pfxdata->validity.time_stamp = 1;           /* 'Time Stamp Valid'   */
 287
 288         rc = get_sync_clock(&pfxdata->define_extend.ep_sys_time);
 289         /* Ignore return code if sync clock is switched off. */
 290         if (rc == -ENOSYS || rc == -EACCES)
 291                 rc = 0;
 292         return rc;
 293 }
 294
 295 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata, int trk,
 296                   int totrk, int cmd, struct dasd_device *basedev,
 297                   struct dasd_device *startdev)
 298 {
 299         struct dasd_eckd_private *basepriv, *startpriv;
 300         struct DE_eckd_data *data;
 301         struct ch_t geo, beg, end;
 302         int rc = 0;
 303
 304         basepriv = (struct dasd_eckd_private *) basedev->private;
 305         startpriv = (struct dasd_eckd_private *) startdev->private;
 306         data = &pfxdata->define_extend;
 307
 308         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 309         ccw->flags = 0;
 310         ccw->count = sizeof(*pfxdata);
 311         ccw->cda = (__u32) __pa(pfxdata);
 312
 313         memset(pfxdata, 0, sizeof(*pfxdata));
 314         /* prefix data */
 315         pfxdata->format = 0;
 316         pfxdata->base_address = basepriv->conf_data.ned1.unit_addr;
 317         pfxdata->base_lss = basepriv->conf_data.ned1.ID;
 318         pfxdata->validity.define_extend = 1;
 319
 320         /* private uid is kept up to date, conf_data may be outdated */
 321         if (startpriv->uid.type != UA_BASE_DEVICE) {
 322                 pfxdata->validity.verify_base = 1;
 323                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
 324                         pfxdata->validity.hyper_pav = 1;
 325         }
 326
 327         /* define extend data (mostly)*/
 328         switch (cmd) {
 329         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 330         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 331         case DASD_ECKD_CCW_READ:
 332         case DASD_ECKD_CCW_READ_MT:
 333         case DASD_ECKD_CCW_READ_CKD:
 334         case DASD_ECKD_CCW_READ_CKD_MT:
 335         case DASD_ECKD_CCW_READ_KD:
 336         case DASD_ECKD_CCW_READ_KD_MT:
 337         case DASD_ECKD_CCW_READ_COUNT:
 338                 data->mask.perm = 0x1;
 339                 data->attributes.operation = basepriv->attrib.operation;
 340                 break;
 341         case DASD_ECKD_CCW_WRITE:
 342         case DASD_ECKD_CCW_WRITE_MT:
 343         case DASD_ECKD_CCW_WRITE_KD:
 344         case DASD_ECKD_CCW_WRITE_KD_MT:
 345                 data->mask.perm = 0x02;
 346                 data->attributes.operation = basepriv->attrib.operation;
 347                 rc = check_XRC_on_prefix(pfxdata, basedev);
 348                 break;
 349         case DASD_ECKD_CCW_WRITE_CKD:
 350         case DASD_ECKD_CCW_WRITE_CKD_MT:
 351                 data->attributes.operation = DASD_BYPASS_CACHE;
 352                 rc = check_XRC_on_prefix(pfxdata, basedev);
 353                 break;
 354         case DASD_ECKD_CCW_ERASE:
 355         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 356         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 357                 data->mask.perm = 0x3;
 358                 data->mask.auth = 0x1;
 359                 data->attributes.operation = DASD_BYPASS_CACHE;
 360                 rc = check_XRC_on_prefix(pfxdata, basedev);
 361                 break;
 362         default:
 363                 DEV_MESSAGE(KERN_ERR, basedev, "unknown opcode 0x%x", cmd);
 364                 break;
 365         }
 366
 367         data->attributes.mode = 0x3;    /* ECKD */
 368
 369         if ((basepriv->rdc_data.cu_type == 0x2105 ||
 370              basepriv->rdc_data.cu_type == 0x2107 ||
 371              basepriv->rdc_data.cu_type == 0x1750)
 372             && !(basepriv->uses_cdl && trk < 2))
 373                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 374
 375         geo.cyl = basepriv->rdc_data.no_cyl;
 376         geo.head = basepriv->rdc_data.trk_per_cyl;
 377         beg.cyl = trk / geo.head;
 378         beg.head = trk % geo.head;
 379         end.cyl = totrk / geo.head;
 380         end.head = totrk % geo.head;
 381
 382         /* check for sequential prestage - enhance cylinder range */
 383         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 384             data->attributes.operation == DASD_SEQ_ACCESS) {
 385
 386                 if (end.cyl + basepriv->attrib.nr_cyl < geo.cyl)
 387                         end.cyl += basepriv->attrib.nr_cyl;
 388                 else
 389                         end.cyl = (geo.cyl - 1);
 390         }
 391
 392         data->beg_ext.cyl = beg.cyl;
 393         data->beg_ext.head = beg.head;
 394         data->end_ext.cyl = end.cyl;
 395         data->end_ext.head = end.head;
 396         return rc;
 397 }
 398
 399 static void
 400 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, int trk,
 401               int rec_on_trk, int no_rec, int cmd,
 402               struct dasd_device * device, int reclen)
 403 {
 404         struct dasd_eckd_private *private;
 405         int sector;
 406         int dn, d;
 407
 408         private = (struct dasd_eckd_private *) device->private;
 409
 410         DBF_DEV_EVENT(DBF_INFO, device,
 411                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 412                   trk, rec_on_trk, no_rec, cmd, reclen);
 413
 414         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 415         ccw->flags = 0;
 416         ccw->count = 16;
 417         ccw->cda = (__u32) __pa(data);
 418
 419         memset(data, 0, sizeof(struct LO_eckd_data));
 420         sector = 0;
 421         if (rec_on_trk) {
 422                 switch (private->rdc_data.dev_type) {
 423                 case 0x3390:
 424                         dn = ceil_quot(reclen + 6, 232);
 425                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 426                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 427                         break;
 428                 case 0x3380:
 429                         d = 7 + ceil_quot(reclen + 12, 32);
 430                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 431                         break;
 432                 }
 433         }
 434         data->sector = sector;
 435         data->count = no_rec;
 436         switch (cmd) {
 437         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 438                 data->operation.orientation = 0x3;
 439                 data->operation.operation = 0x03;
 440                 break;
 441         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 442                 data->operation.orientation = 0x3;
 443                 data->operation.operation = 0x16;
 444                 break;
 445         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 446                 data->operation.orientation = 0x1;
 447                 data->operation.operation = 0x03;
 448                 data->count++;
 449                 break;
 450         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 451                 data->operation.orientation = 0x3;
 452                 data->operation.operation = 0x16;
 453                 data->count++;
 454                 break;
 455         case DASD_ECKD_CCW_WRITE:
 456         case DASD_ECKD_CCW_WRITE_MT:
 457         case DASD_ECKD_CCW_WRITE_KD:
 458         case DASD_ECKD_CCW_WRITE_KD_MT:
 459                 data->auxiliary.last_bytes_used = 0x1;
 460                 data->length = reclen;
 461                 data->operation.operation = 0x01;
 462                 break;
 463         case DASD_ECKD_CCW_WRITE_CKD:
 464         case DASD_ECKD_CCW_WRITE_CKD_MT:
 465                 data->auxiliary.last_bytes_used = 0x1;
 466                 data->length = reclen;
 467                 data->operation.operation = 0x03;
 468                 break;
 469         case DASD_ECKD_CCW_READ:
 470         case DASD_ECKD_CCW_READ_MT:
 471         case DASD_ECKD_CCW_READ_KD:
 472         case DASD_ECKD_CCW_READ_KD_MT:
 473                 data->auxiliary.last_bytes_used = 0x1;
 474                 data->length = reclen;
 475                 data->operation.operation = 0x06;
 476                 break;
 477         case DASD_ECKD_CCW_READ_CKD:
 478         case DASD_ECKD_CCW_READ_CKD_MT:
 479                 data->auxiliary.last_bytes_used = 0x1;
 480                 data->length = reclen;
 481                 data->operation.operation = 0x16;
 482                 break;
 483         case DASD_ECKD_CCW_READ_COUNT:
 484                 data->operation.operation = 0x06;
 485                 break;
 486         case DASD_ECKD_CCW_ERASE:
 487                 data->length = reclen;
 488                 data->auxiliary.last_bytes_used = 0x1;
 489                 data->operation.operation = 0x0b;
 490                 break;
 491         default:
 492                 DEV_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", cmd);
 493         }
 494         data->seek_addr.cyl = data->search_arg.cyl =
 495                 trk / private->rdc_data.trk_per_cyl;
 496         data->seek_addr.head = data->search_arg.head =
 497                 trk % private->rdc_data.trk_per_cyl;
 498         data->search_arg.record = rec_on_trk;
 499 }
 500
 501 /*
 502  * Returns 1 if the block is one of the special blocks that needs
 503  * to get read/written with the KD variant of the command.
 504  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 505  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 506  * Luckily the KD variants differ only by one bit (0x08) from the
 507  * normal variant. So don't wonder about code like:
 508  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 509  *         ccw->cmd_code |= 0x8;
 510  */
 511 static inline int
 512 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 513 {
 514         if (recid < 3)
 515                 return 1;
 516         if (recid < blk_per_trk)
 517                 return 0;
 518         if (recid < 2 * blk_per_trk)
 519                 return 1;
 520         return 0;
 521 }
 522
 523 /*
 524  * Returns the record size for the special blocks of the cdl format.
 525  * Only returns something useful if dasd_eckd_cdl_special is true
 526  * for the recid.
 527  */
 528 static inline int
 529 dasd_eckd_cdl_reclen(int recid)
 530 {
 531         if (recid < 3)
 532                 return sizes_trk0[recid];
 533         return LABEL_SIZE;
 534 }
 535
 536 /*
 537  * Generate device unique id that specifies the physical device.
 538  */
 539 static int
 540 dasd_eckd_generate_uid(struct dasd_device *device, struct dasd_uid *uid)
 541 {
 542         struct dasd_eckd_private *private;
 543         struct dasd_eckd_confdata *confdata;
 544
 545         private = (struct dasd_eckd_private *) device->private;
 546         if (!private)
 547                 return -ENODEV;
 548         confdata = &private->conf_data;
 549         if (!confdata)
 550                 return -ENODEV;
 551
 552         memset(uid, 0, sizeof(struct dasd_uid));
 553         memcpy(uid->vendor, confdata->ned1.HDA_manufacturer,
 554                sizeof(uid->vendor) - 1);
 555         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 556         memcpy(uid->serial, confdata->ned1.HDA_location,
 557                sizeof(uid->serial) - 1);
 558         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 559         uid->ssid = confdata->neq.subsystemID;
 560         uid->real_unit_addr = confdata->ned1.unit_addr;
 561         if (confdata->ned2.sneq.flags == 0x40 &&
 562             confdata->ned2.sneq.format == 0x0001) {
 563                 uid->type = confdata->ned2.sneq.sua_flags;
 564                 if (uid->type == UA_BASE_PAV_ALIAS)
 565                         uid->base_unit_addr = confdata->ned2.sneq.base_unit_addr;
 566         } else {
 567                 uid->type = UA_BASE_DEVICE;
 568         }
 569         return 0;
 570 }
 571
 572 static struct dasd_ccw_req *dasd_eckd_build_rcd_lpm(struct dasd_device *device,
 573                                                     void *rcd_buffer,
 574                                                     struct ciw *ciw, __u8 lpm)
 575 {
 576         struct dasd_ccw_req *cqr;
 577         struct ccw1 *ccw;
 578
 579         cqr = dasd_smalloc_request("ECKD", 1 /* RCD */, ciw->count, device);
 580
 581         if (IS_ERR(cqr)) {
 582                 DEV_MESSAGE(KERN_WARNING, device, "%s",
 583                             "Could not allocate RCD request");
 584                 return cqr;
 585         }
 586
 587         ccw = cqr->cpaddr;
 588         ccw->cmd_code = ciw->cmd;
 589         ccw->cda = (__u32)(addr_t)rcd_buffer;
 590         ccw->count = ciw->count;
 591
 592         cqr->startdev = device;
 593         cqr->memdev = device;
 594         cqr->block = NULL;
 595         cqr->expires = 10*HZ;
 596         cqr->lpm = lpm;
 597         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 598         cqr->retries = 2;
 599         cqr->buildclk = get_clock();
 600         cqr->status = DASD_CQR_FILLED;
 601         return cqr;
 602 }
 603
 604 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 605                                    void **rcd_buffer,
 606                                    int *rcd_buffer_size, __u8 lpm)
 607 {
 608         struct ciw *ciw;
 609         char *rcd_buf = NULL;
 610         int ret;
 611         struct dasd_ccw_req *cqr;
 612
 613         /*
 614          * scan for RCD command in extended SenseID data
 615          */
 616         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 617         if (!ciw || ciw->cmd == 0) {
 618                 ret = -EOPNOTSUPP;
 619                 goto out_error;
 620         }
 621         rcd_buf = kzalloc(ciw->count, GFP_KERNEL | GFP_DMA);
 622         if (!rcd_buf) {
 623                 ret = -ENOMEM;
 624                 goto out_error;
 625         }
 626         cqr = dasd_eckd_build_rcd_lpm(device, rcd_buf, ciw, lpm);
 627         if (IS_ERR(cqr)) {
 628                 ret =  PTR_ERR(cqr);
 629                 goto out_error;
 630         }
 631         ret = dasd_sleep_on(cqr);
 632         /*
 633          * on success we update the user input parms
 634          */
 635         dasd_sfree_request(cqr, cqr->memdev);
 636         if (ret)
 637                 goto out_error;
 638
 639         *rcd_buffer_size = ciw->count;
 640         *rcd_buffer = rcd_buf;
 641         return 0;
 642 out_error:
 643         kfree(rcd_buf);
 644         *rcd_buffer = NULL;
 645         *rcd_buffer_size = 0;
 646         return ret;
 647 }
 648
 649 static int
 650 dasd_eckd_read_conf(struct dasd_device *device)
 651 {
 652         void *conf_data;
 653         int conf_len, conf_data_saved;
 654         int rc;
 655         __u8 lpm;
 656         struct dasd_eckd_private *private;
 657         struct dasd_eckd_path *path_data;
 658
 659         private = (struct dasd_eckd_private *) device->private;
 660         path_data = (struct dasd_eckd_path *) &private->path_data;
 661         path_data->opm = ccw_device_get_path_mask(device->cdev);
 662         lpm = 0x80;
 663         conf_data_saved = 0;
 664
 665         /* get configuration data per operational path */
 666         for (lpm = 0x80; lpm; lpm>>= 1) {
 667                 if (lpm & path_data->opm){
 668                         rc = dasd_eckd_read_conf_lpm(device, &conf_data,
 669                                                      &conf_len, lpm);
 670                         if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
 671                                 MESSAGE(KERN_WARNING,
 672                                         "Read configuration data returned "
 673                                         "error %d", rc);
 674                                 return rc;
 675                         }
 676                         if (conf_data == NULL) {
 677                                 MESSAGE(KERN_WARNING, "%s", "No configuration "
 678                                         "data retrieved");
 679                                 continue;       /* no error */
 680                         }
 681                         if (conf_len != sizeof(struct dasd_eckd_confdata)) {
 682                                 MESSAGE(KERN_WARNING,
 683                                         "sizes of configuration data mismatch"
 684                                         "%d (read) vs %ld (expected)",
 685                                         conf_len,
 686                                         sizeof(struct dasd_eckd_confdata));
 687                                 kfree(conf_data);
 688                                 continue;       /* no error */
 689                         }
 690                         /* save first valid configuration data */
 691                         if (!conf_data_saved){
 692                                 memcpy(&private->conf_data, conf_data,
 693                                        sizeof(struct dasd_eckd_confdata));
 694                                 conf_data_saved++;
 695                         }
 696                         switch (((char *)conf_data)[242] & 0x07){
 697                         case 0x02:
 698                                 path_data->npm |= lpm;
 699                                 break;
 700                         case 0x03:
 701                                 path_data->ppm |= lpm;
 702                                 break;
 703                         }
 704                         kfree(conf_data);
 705                 }
 706         }
 707         return 0;
 708 }
 709
 710 static int dasd_eckd_read_features(struct dasd_device *device)
 711 {
 712         struct dasd_psf_prssd_data *prssdp;
 713         struct dasd_rssd_features *features;
 714         struct dasd_ccw_req *cqr;
 715         struct ccw1 *ccw;
 716         int rc;
 717         struct dasd_eckd_private *private;
 718
 719         private = (struct dasd_eckd_private *) device->private;
 720         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
 721                                    1 /* PSF */  + 1 /* RSSD */ ,
 722                                    (sizeof(struct dasd_psf_prssd_data) +
 723                                     sizeof(struct dasd_rssd_features)),
 724                                    device);
 725         if (IS_ERR(cqr)) {
 726                 DEV_MESSAGE(KERN_WARNING, device, "%s",
 727                             "Could not allocate initialization request");
 728                 return PTR_ERR(cqr);
 729         }
 730         cqr->startdev = device;
 731         cqr->memdev = device;
 732         cqr->block = NULL;
 733         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 734         cqr->retries = 5;
 735         cqr->expires = 10 * HZ;
 736
 737         /* Prepare for Read Subsystem Data */
 738         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
 739         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
 740         prssdp->order = PSF_ORDER_PRSSD;
 741         prssdp->suborder = 0x41;        /* Read Feature Codes */
 742         /* all other bytes of prssdp must be zero */
 743
 744         ccw = cqr->cpaddr;
 745         ccw->cmd_code = DASD_ECKD_CCW_PSF;
 746         ccw->count = sizeof(struct dasd_psf_prssd_data);
 747         ccw->flags |= CCW_FLAG_CC;
 748         ccw->cda = (__u32)(addr_t) prssdp;
 749
 750         /* Read Subsystem Data - feature codes */
 751         features = (struct dasd_rssd_features *) (prssdp + 1);
 752         memset(features, 0, sizeof(struct dasd_rssd_features));
 753
 754         ccw++;
 755         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
 756         ccw->count = sizeof(struct dasd_rssd_features);
 757         ccw->cda = (__u32)(addr_t) features;
 758
 759         cqr->buildclk = get_clock();
 760         cqr->status = DASD_CQR_FILLED;
 761         rc = dasd_sleep_on(cqr);
 762         if (rc == 0) {
 763                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
 764                 features = (struct dasd_rssd_features *) (prssdp + 1);
 765                 memcpy(&private->features, features,
 766                        sizeof(struct dasd_rssd_features));
 767         }
 768         dasd_sfree_request(cqr, cqr->memdev);
 769         return rc;
 770 }
 771
 772
 773 /*
 774  * Build CP for Perform Subsystem Function - SSC.
 775  */
 776 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device)
 777 {
 778         struct dasd_ccw_req *cqr;
 779         struct dasd_psf_ssc_data *psf_ssc_data;
 780         struct ccw1 *ccw;
 781
 782         cqr = dasd_smalloc_request("ECKD", 1 /* PSF */ ,
 783                                   sizeof(struct dasd_psf_ssc_data),
 784                                   device);
 785
 786         if (IS_ERR(cqr)) {
 787                 DEV_MESSAGE(KERN_WARNING, device, "%s",
 788                            "Could not allocate PSF-SSC request");
 789                 return cqr;
 790         }
 791         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
 792         psf_ssc_data->order = PSF_ORDER_SSC;
 793         psf_ssc_data->suborder = 0x88;
 794         psf_ssc_data->reserved[0] = 0x88;
 795
 796         ccw = cqr->cpaddr;
 797         ccw->cmd_code = DASD_ECKD_CCW_PSF;
 798         ccw->cda = (__u32)(addr_t)psf_ssc_data;
 799         ccw->count = 66;
 800
 801         cqr->startdev = device;
 802         cqr->memdev = device;
 803         cqr->block = NULL;
 804         cqr->expires = 10*HZ;
 805         cqr->buildclk = get_clock();
 806         cqr->status = DASD_CQR_FILLED;
 807         return cqr;
 808 }
 809
 810 /*
 811  * Perform Subsystem Function.
 812  * It is necessary to trigger CIO for channel revalidation since this
 813  * call might change behaviour of DASD devices.
 814  */
 815 static int
 816 dasd_eckd_psf_ssc(struct dasd_device *device)
 817 {
 818         struct dasd_ccw_req *cqr;
 819         int rc;
 820
 821         cqr = dasd_eckd_build_psf_ssc(device);
 822         if (IS_ERR(cqr))
 823                 return PTR_ERR(cqr);
 824
 825         rc = dasd_sleep_on(cqr);
 826         if (!rc)
 827                 /* trigger CIO to reprobe devices */
 828                 css_schedule_reprobe();
 829         dasd_sfree_request(cqr, cqr->memdev);
 830         return rc;
 831 }
 832
 833 /*
 834  * Valide storage server of current device.
 835  */
 836 static int dasd_eckd_validate_server(struct dasd_device *device)
 837 {
 838         int rc;
 839         struct dasd_eckd_private *private;
 840
 841         /* Currently PAV is the only reason to 'validate' server on LPAR */
 842         if (dasd_nopav || MACHINE_IS_VM)
 843                 return 0;
 844
 845         rc = dasd_eckd_psf_ssc(device);
 846         /* may be requested feature is not available on server,
 847          * therefore just report error and go ahead */
 848         private = (struct dasd_eckd_private *) device->private;
 849         DEV_MESSAGE(KERN_INFO, device,
 850                     "PSF-SSC on storage subsystem %s.%s.%04x returned rc=%d",
 851                     private->uid.vendor, private->uid.serial,
 852                     private->uid.ssid, rc);
 853         /* RE-Read Configuration Data */
 854         return dasd_eckd_read_conf(device);
 855 }
 856
 857 /*
 858  * Check device characteristics.
 859  * If the device is accessible using ECKD discipline, the device is enabled.
 860  */
 861 static int
 862 dasd_eckd_check_characteristics(struct dasd_device *device)
 863 {
 864         struct dasd_eckd_private *private;
 865         struct dasd_block *block;
 866         void *rdc_data;
 867         int is_known, rc;
 868
 869         private = (struct dasd_eckd_private *) device->private;
 870         if (private == NULL) {
 871                 private = kzalloc(sizeof(struct dasd_eckd_private),
 872                                   GFP_KERNEL | GFP_DMA);
 873                 if (private == NULL) {
 874                         DEV_MESSAGE(KERN_WARNING, device, "%s",
 875                                     "memory allocation failed for private "
 876                                     "data");
 877                         return -ENOMEM;
 878                 }
 879                 device->private = (void *) private;
 880         }
 881         /* Invalidate status of initial analysis. */
 882         private->init_cqr_status = -1;
 883         /* Set default cache operations. */
 884         private->attrib.operation = DASD_NORMAL_CACHE;
 885         private->attrib.nr_cyl = 0;
 886
 887         /* Read Configuration Data */
 888         rc = dasd_eckd_read_conf(device);
 889         if (rc)
 890                 goto out_err1;
 891
 892         /* Generate device unique id and register in devmap */
 893         rc = dasd_eckd_generate_uid(device, &private->uid);
 894         if (rc)
 895                 goto out_err1;
 896         dasd_set_uid(device->cdev, &private->uid);
 897
 898         if (private->uid.type == UA_BASE_DEVICE) {
 899                 block = dasd_alloc_block();
 900                 if (IS_ERR(block)) {
 901                         DEV_MESSAGE(KERN_WARNING, device, "%s",
 902                                     "could not allocate dasd block structure");
 903                         rc = PTR_ERR(block);
 904                         goto out_err1;
 905                 }
 906                 device->block = block;
 907                 block->base = device;
 908         }
 909
 910         /* register lcu with alias handling, enable PAV if this is a new lcu */
 911         is_known = dasd_alias_make_device_known_to_lcu(device);
 912         if (is_known < 0) {
 913                 rc = is_known;
 914                 goto out_err2;
 915         }
 916         if (!is_known) {
 917                 /* new lcu found */
 918                 rc = dasd_eckd_validate_server(device); /* will switch pav on */
 919                 if (rc)
 920                         goto out_err3;
 921         }
 922
 923         /* Read Feature Codes */
 924         rc = dasd_eckd_read_features(device);
 925         if (rc)
 926                 goto out_err3;
 927
 928         /* Read Device Characteristics */
 929         rdc_data = (void *) &(private->rdc_data);
 930         memset(rdc_data, 0, sizeof(rdc_data));
 931         rc = dasd_generic_read_dev_chars(device, "ECKD", &rdc_data, 64);
 932         if (rc) {
 933                 DEV_MESSAGE(KERN_WARNING, device,
 934                             "Read device characteristics returned "
 935                             "rc=%d", rc);
 936                 goto out_err3;
 937         }
 938         DEV_MESSAGE(KERN_INFO, device,
 939                     "%04X/%02X(CU:%04X/%02X) Cyl:%d Head:%d Sec:%d",
 940                     private->rdc_data.dev_type,
 941                     private->rdc_data.dev_model,
 942                     private->rdc_data.cu_type,
 943                     private->rdc_data.cu_model.model,
 944                     private->rdc_data.no_cyl,
 945                     private->rdc_data.trk_per_cyl,
 946                     private->rdc_data.sec_per_trk);
 947         return 0;
 948
 949 out_err3:
 950         dasd_alias_disconnect_device_from_lcu(device);
 951 out_err2:
 952         dasd_free_block(device->block);
 953         device->block = NULL;
 954 out_err1:
 955         kfree(device->private);
 956         device->private = NULL;
 957         return rc;
 958 }
 959
 960 static void dasd_eckd_uncheck_device(struct dasd_device *device)
 961 {
 962         dasd_alias_disconnect_device_from_lcu(device);
 963 }
 964
 965 static struct dasd_ccw_req *
 966 dasd_eckd_analysis_ccw(struct dasd_device *device)
 967 {
 968         struct dasd_eckd_private *private;
 969         struct eckd_count *count_data;
 970         struct LO_eckd_data *LO_data;
 971         struct dasd_ccw_req *cqr;
 972         struct ccw1 *ccw;
 973         int cplength, datasize;
 974         int i;
 975
 976         private = (struct dasd_eckd_private *) device->private;
 977
 978         cplength = 8;
 979         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
 980         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
 981                                    cplength, datasize, device);
 982         if (IS_ERR(cqr))
 983                 return cqr;
 984         ccw = cqr->cpaddr;
 985         /* Define extent for the first 3 tracks. */
 986         define_extent(ccw++, cqr->data, 0, 2,
 987                       DASD_ECKD_CCW_READ_COUNT, device);
 988         LO_data = cqr->data + sizeof(struct DE_eckd_data);
 989         /* Locate record for the first 4 records on track 0. */
 990         ccw[-1].flags |= CCW_FLAG_CC;
 991         locate_record(ccw++, LO_data++, 0, 0, 4,
 992                       DASD_ECKD_CCW_READ_COUNT, device, 0);
 993
 994         count_data = private->count_area;
 995         for (i = 0; i < 4; i++) {
 996                 ccw[-1].flags |= CCW_FLAG_CC;
 997                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
 998                 ccw->flags = 0;
 999                 ccw->count = 8;
1000                 ccw->cda = (__u32)(addr_t) count_data;
1001                 ccw++;
1002                 count_data++;
1003         }
1004
1005         /* Locate record for the first record on track 2. */
1006         ccw[-1].flags |= CCW_FLAG_CC;
1007         locate_record(ccw++, LO_data++, 2, 0, 1,
1008                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1009         /* Read count ccw. */
1010         ccw[-1].flags |= CCW_FLAG_CC;
1011         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1012         ccw->flags = 0;
1013         ccw->count = 8;
1014         ccw->cda = (__u32)(addr_t) count_data;
1015
1016         cqr->block = NULL;
1017         cqr->startdev = device;
1018         cqr->memdev = device;
1019         cqr->retries = 0;
1020         cqr->buildclk = get_clock();
1021         cqr->status = DASD_CQR_FILLED;
1022         return cqr;
1023 }
1024
1025 /*
1026  * This is the callback function for the init_analysis cqr. It saves
1027  * the status of the initial analysis ccw before it frees it and kicks
1028  * the device to continue the startup sequence. This will call
1029  * dasd_eckd_do_analysis again (if the devices has not been marked
1030  * for deletion in the meantime).
1031  */
1032 static void
1033 dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, void *data)
1034 {
1035         struct dasd_eckd_private *private;
1036         struct dasd_device *device;
1037
1038         device = init_cqr->startdev;
1039         private = (struct dasd_eckd_private *) device->private;
1040         private->init_cqr_status = init_cqr->status;
1041         dasd_sfree_request(init_cqr, device);
1042         dasd_kick_device(device);
1043 }
1044
1045 static int
1046 dasd_eckd_start_analysis(struct dasd_block *block)
1047 {
1048         struct dasd_eckd_private *private;
1049         struct dasd_ccw_req *init_cqr;
1050
1051         private = (struct dasd_eckd_private *) block->base->private;
1052         init_cqr = dasd_eckd_analysis_ccw(block->base);
1053         if (IS_ERR(init_cqr))
1054                 return PTR_ERR(init_cqr);
1055         init_cqr->callback = dasd_eckd_analysis_callback;
1056         init_cqr->callback_data = NULL;
1057         init_cqr->expires = 5*HZ;
1058         dasd_add_request_head(init_cqr);
1059         return -EAGAIN;
1060 }
1061
1062 static int
1063 dasd_eckd_end_analysis(struct dasd_block *block)
1064 {
1065         struct dasd_device *device;
1066         struct dasd_eckd_private *private;
1067         struct eckd_count *count_area;
1068         unsigned int sb, blk_per_trk;
1069         int status, i;
1070
1071         device = block->base;
1072         private = (struct dasd_eckd_private *) device->private;
1073         status = private->init_cqr_status;
1074         private->init_cqr_status = -1;
1075         if (status != DASD_CQR_DONE) {
1076                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1077                             "volume analysis returned unformatted disk");
1078                 return -EMEDIUMTYPE;
1079         }
1080
1081         private->uses_cdl = 1;
1082         /* Calculate number of blocks/records per track. */
1083         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1084         /* Check Track 0 for Compatible Disk Layout */
1085         count_area = NULL;
1086         for (i = 0; i < 3; i++) {
1087                 if (private->count_area[i].kl != 4 ||
1088                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
1089                         private->uses_cdl = 0;
1090                         break;
1091                 }
1092         }
1093         if (i == 3)
1094                 count_area = &private->count_area[4];
1095
1096         if (private->uses_cdl == 0) {
1097                 for (i = 0; i < 5; i++) {
1098                         if ((private->count_area[i].kl != 0) ||
1099                             (private->count_area[i].dl !=
1100                              private->count_area[0].dl))
1101                                 break;
1102                 }
1103                 if (i == 5)
1104                         count_area = &private->count_area[0];
1105         } else {
1106                 if (private->count_area[3].record == 1)
1107                         DEV_MESSAGE(KERN_WARNING, device, "%s",
1108                                     "Trk 0: no records after VTOC!");
1109         }
1110         if (count_area != NULL && count_area->kl == 0) {
1111                 /* we found notthing violating our disk layout */
1112                 if (dasd_check_blocksize(count_area->dl) == 0)
1113                         block->bp_block = count_area->dl;
1114         }
1115         if (block->bp_block == 0) {
1116                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1117                             "Volume has incompatible disk layout");
1118                 return -EMEDIUMTYPE;
1119         }
1120         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1121         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1122                 block->s2b_shift++;
1123
1124         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1125         block->blocks = (private->rdc_data.no_cyl *
1126                           private->rdc_data.trk_per_cyl *
1127                           blk_per_trk);
1128
1129         DEV_MESSAGE(KERN_INFO, device,
1130                     "(%dkB blks): %dkB at %dkB/trk %s",
1131                     (block->bp_block >> 10),
1132                     ((private->rdc_data.no_cyl *
1133                       private->rdc_data.trk_per_cyl *
1134                       blk_per_trk * (block->bp_block >> 9)) >> 1),
1135                     ((blk_per_trk * block->bp_block) >> 10),
1136                     private->uses_cdl ?
1137                     "compatible disk layout" : "linux disk layout");
1138
1139         return 0;
1140 }
1141
1142 static int dasd_eckd_do_analysis(struct dasd_block *block)
1143 {
1144         struct dasd_eckd_private *private;
1145
1146         private = (struct dasd_eckd_private *) block->base->private;
1147         if (private->init_cqr_status < 0)
1148                 return dasd_eckd_start_analysis(block);
1149         else
1150                 return dasd_eckd_end_analysis(block);
1151 }
1152
1153 static int dasd_eckd_ready_to_online(struct dasd_device *device)
1154 {
1155         return dasd_alias_add_device(device);
1156 };
1157
1158 static int dasd_eckd_online_to_ready(struct dasd_device *device)
1159 {
1160         return dasd_alias_remove_device(device);
1161 };
1162
1163 static int
1164 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
1165 {
1166         struct dasd_eckd_private *private;
1167
1168         private = (struct dasd_eckd_private *) block->base->private;
1169         if (dasd_check_blocksize(block->bp_block) == 0) {
1170                 geo->sectors = recs_per_track(&private->rdc_data,
1171                                               0, block->bp_block);
1172         }
1173         geo->cylinders = private->rdc_data.no_cyl;
1174         geo->heads = private->rdc_data.trk_per_cyl;
1175         return 0;
1176 }
1177
1178 static struct dasd_ccw_req *
1179 dasd_eckd_format_device(struct dasd_device * device,
1180                         struct format_data_t * fdata)
1181 {
1182         struct dasd_eckd_private *private;
1183         struct dasd_ccw_req *fcp;
1184         struct eckd_count *ect;
1185         struct ccw1 *ccw;
1186         void *data;
1187         int rpt, cyl, head;
1188         int cplength, datasize;
1189         int i;
1190
1191         private = (struct dasd_eckd_private *) device->private;
1192         rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
1193         cyl = fdata->start_unit / private->rdc_data.trk_per_cyl;
1194         head = fdata->start_unit % private->rdc_data.trk_per_cyl;
1195
1196         /* Sanity checks. */
1197         if (fdata->start_unit >=
1198             (private->rdc_data.no_cyl * private->rdc_data.trk_per_cyl)) {
1199                 DEV_MESSAGE(KERN_INFO, device, "Track no %d too big!",
1200                             fdata->start_unit);
1201                 return ERR_PTR(-EINVAL);
1202         }
1203         if (fdata->start_unit > fdata->stop_unit) {
1204                 DEV_MESSAGE(KERN_INFO, device, "Track %d reached! ending.",
1205                             fdata->start_unit);
1206                 return ERR_PTR(-EINVAL);
1207         }
1208         if (dasd_check_blocksize(fdata->blksize) != 0) {
1209                 DEV_MESSAGE(KERN_WARNING, device,
1210                             "Invalid blocksize %d...terminating!",
1211                             fdata->blksize);
1212                 return ERR_PTR(-EINVAL);
1213         }
1214
1215         /*
1216          * fdata->intensity is a bit string that tells us what to do:
1217          *   Bit 0: write record zero
1218          *   Bit 1: write home address, currently not supported
1219          *   Bit 2: invalidate tracks
1220          *   Bit 3: use OS/390 compatible disk layout (cdl)
1221          * Only some bit combinations do make sense.
1222          */
1223         switch (fdata->intensity) {
1224         case 0x00:      /* Normal format */
1225         case 0x08:      /* Normal format, use cdl. */
1226                 cplength = 2 + rpt;
1227                 datasize = sizeof(struct DE_eckd_data) +
1228                         sizeof(struct LO_eckd_data) +
1229                         rpt * sizeof(struct eckd_count);
1230                 break;
1231         case 0x01:      /* Write record zero and format track. */
1232         case 0x09:      /* Write record zero and format track, use cdl. */
1233                 cplength = 3 + rpt;
1234                 datasize = sizeof(struct DE_eckd_data) +
1235                         sizeof(struct LO_eckd_data) +
1236                         sizeof(struct eckd_count) +
1237                         rpt * sizeof(struct eckd_count);
1238                 break;
1239         case 0x04:      /* Invalidate track. */
1240         case 0x0c:      /* Invalidate track, use cdl. */
1241                 cplength = 3;
1242                 datasize = sizeof(struct DE_eckd_data) +
1243                         sizeof(struct LO_eckd_data) +
1244                         sizeof(struct eckd_count);
1245                 break;
1246         default:
1247                 DEV_MESSAGE(KERN_WARNING, device, "Invalid flags 0x%x.",
1248                             fdata->intensity);
1249                 return ERR_PTR(-EINVAL);
1250         }
1251         /* Allocate the format ccw request. */
1252         fcp = dasd_smalloc_request(dasd_eckd_discipline.name,
1253                                    cplength, datasize, device);
1254         if (IS_ERR(fcp))
1255                 return fcp;
1256
1257         data = fcp->data;
1258         ccw = fcp->cpaddr;
1259
1260         switch (fdata->intensity & ~0x08) {
1261         case 0x00: /* Normal format. */
1262                 define_extent(ccw++, (struct DE_eckd_data *) data,
1263                               fdata->start_unit, fdata->start_unit,
1264                               DASD_ECKD_CCW_WRITE_CKD, device);
1265                 data += sizeof(struct DE_eckd_data);
1266                 ccw[-1].flags |= CCW_FLAG_CC;
1267                 locate_record(ccw++, (struct LO_eckd_data *) data,
1268                               fdata->start_unit, 0, rpt,
1269                               DASD_ECKD_CCW_WRITE_CKD, device,
1270                               fdata->blksize);
1271                 data += sizeof(struct LO_eckd_data);
1272                 break;
1273         case 0x01: /* Write record zero + format track. */
1274                 define_extent(ccw++, (struct DE_eckd_data *) data,
1275                               fdata->start_unit, fdata->start_unit,
1276                               DASD_ECKD_CCW_WRITE_RECORD_ZERO,
1277                               device);
1278                 data += sizeof(struct DE_eckd_data);
1279                 ccw[-1].flags |= CCW_FLAG_CC;
1280                 locate_record(ccw++, (struct LO_eckd_data *) data,
1281                               fdata->start_unit, 0, rpt + 1,
1282                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
1283                               device->block->bp_block);
1284                 data += sizeof(struct LO_eckd_data);
1285                 break;
1286         case 0x04: /* Invalidate track. */
1287                 define_extent(ccw++, (struct DE_eckd_data *) data,
1288                               fdata->start_unit, fdata->start_unit,
1289                               DASD_ECKD_CCW_WRITE_CKD, device);
1290                 data += sizeof(struct DE_eckd_data);
1291                 ccw[-1].flags |= CCW_FLAG_CC;
1292                 locate_record(ccw++, (struct LO_eckd_data *) data,
1293                               fdata->start_unit, 0, 1,
1294                               DASD_ECKD_CCW_WRITE_CKD, device, 8);
1295                 data += sizeof(struct LO_eckd_data);
1296                 break;
1297         }
1298         if (fdata->intensity & 0x01) {  /* write record zero */
1299                 ect = (struct eckd_count *) data;
1300                 data += sizeof(struct eckd_count);
1301                 ect->cyl = cyl;
1302                 ect->head = head;
1303                 ect->record = 0;
1304                 ect->kl = 0;
1305                 ect->dl = 8;
1306                 ccw[-1].flags |= CCW_FLAG_CC;
1307                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
1308                 ccw->flags = CCW_FLAG_SLI;
1309                 ccw->count = 8;
1310                 ccw->cda = (__u32)(addr_t) ect;
1311                 ccw++;
1312         }
1313         if ((fdata->intensity & ~0x08) & 0x04) {        /* erase track */
1314                 ect = (struct eckd_count *) data;
1315                 data += sizeof(struct eckd_count);
1316                 ect->cyl = cyl;
1317                 ect->head = head;
1318                 ect->record = 1;
1319                 ect->kl = 0;
1320                 ect->dl = 0;
1321                 ccw[-1].flags |= CCW_FLAG_CC;
1322                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1323                 ccw->flags = CCW_FLAG_SLI;
1324                 ccw->count = 8;
1325                 ccw->cda = (__u32)(addr_t) ect;
1326         } else {                /* write remaining records */
1327                 for (i = 0; i < rpt; i++) {
1328                         ect = (struct eckd_count *) data;
1329                         data += sizeof(struct eckd_count);
1330                         ect->cyl = cyl;
1331                         ect->head = head;
1332                         ect->record = i + 1;
1333                         ect->kl = 0;
1334                         ect->dl = fdata->blksize;
1335                         /* Check for special tracks 0-1 when formatting CDL */
1336                         if ((fdata->intensity & 0x08) &&
1337                             fdata->start_unit == 0) {
1338                                 if (i < 3) {
1339                                         ect->kl = 4;
1340                                         ect->dl = sizes_trk0[i] - 4;
1341                                 }
1342                         }
1343                         if ((fdata->intensity & 0x08) &&
1344                             fdata->start_unit == 1) {
1345                                 ect->kl = 44;
1346                                 ect->dl = LABEL_SIZE - 44;
1347                         }
1348                         ccw[-1].flags |= CCW_FLAG_CC;
1349                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1350                         ccw->flags = CCW_FLAG_SLI;
1351                         ccw->count = 8;
1352                         ccw->cda = (__u32)(addr_t) ect;
1353                         ccw++;
1354                 }
1355         }
1356         fcp->startdev = device;
1357         fcp->memdev = device;
1358         clear_bit(DASD_CQR_FLAGS_USE_ERP, &fcp->flags);
1359         fcp->retries = 5;       /* set retry counter to enable default ERP */
1360         fcp->buildclk = get_clock();
1361         fcp->status = DASD_CQR_FILLED;
1362         return fcp;
1363 }
1364
1365 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
1366 {
1367         cqr->status = DASD_CQR_FILLED;
1368         if (cqr->block && (cqr->startdev != cqr->block->base)) {
1369                 dasd_eckd_reset_ccw_to_base_io(cqr);
1370                 cqr->startdev = cqr->block->base;
1371         }
1372 };
1373
1374 static dasd_erp_fn_t
1375 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
1376 {
1377         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
1378         struct ccw_device *cdev = device->cdev;
1379
1380         switch (cdev->id.cu_type) {
1381         case 0x3990:
1382         case 0x2105:
1383         case 0x2107:
1384         case 0x1750:
1385                 return dasd_3990_erp_action;
1386         case 0x9343:
1387         case 0x3880:
1388         default:
1389                 return dasd_default_erp_action;
1390         }
1391 }
1392
1393 static dasd_erp_fn_t
1394 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
1395 {
1396         return dasd_default_erp_postaction;
1397 }
1398
1399
1400 static void dasd_eckd_handle_unsolicited_interrupt(struct dasd_device *device,
1401                                                    struct irb *irb)
1402 {
1403         char mask;
1404
1405         /* first of all check for state change pending interrupt */
1406         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
1407         if ((irb->scsw.cmd.dstat & mask) == mask) {
1408                 dasd_generic_handle_state_change(device);
1409                 return;
1410         }
1411
1412         /* summary unit check */
1413         if ((irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
1414             (irb->ecw[7] == 0x0D)) {
1415                 dasd_alias_handle_summary_unit_check(device, irb);
1416                 return;
1417         }
1418
1419
1420         /* service information message SIM */
1421         if ((irb->ecw[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE) {
1422                 dasd_3990_erp_handle_sim(device, irb->ecw);
1423                 return;
1424         }
1425
1426         /* just report other unsolicited interrupts */
1427         DEV_MESSAGE(KERN_DEBUG, device, "%s",
1428                     "unsolicited interrupt received");
1429         device->discipline->dump_sense(device, NULL, irb);
1430         dasd_schedule_device_bh(device);
1431
1432         return;
1433 };
1434
1435 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
1436                                                struct dasd_block *block,
1437                                                struct request *req)
1438 {
1439         struct dasd_eckd_private *private;
1440         unsigned long *idaws;
1441         struct LO_eckd_data *LO_data;
1442         struct dasd_ccw_req *cqr;
1443         struct ccw1 *ccw;
1444         struct req_iterator iter;
1445         struct bio_vec *bv;
1446         char *dst;
1447         unsigned int blksize, blk_per_trk, off;
1448         int count, cidaw, cplength, datasize;
1449         sector_t recid, first_rec, last_rec;
1450         sector_t first_trk, last_trk;
1451         unsigned int first_offs, last_offs;
1452         unsigned char cmd, rcmd;
1453         int use_prefix;
1454         struct dasd_device *basedev;
1455
1456         basedev = block->base;
1457         private = (struct dasd_eckd_private *) basedev->private;
1458         if (rq_data_dir(req) == READ)
1459                 cmd = DASD_ECKD_CCW_READ_MT;
1460         else if (rq_data_dir(req) == WRITE)
1461                 cmd = DASD_ECKD_CCW_WRITE_MT;
1462         else
1463                 return ERR_PTR(-EINVAL);
1464         /* Calculate number of blocks/records per track. */
1465         blksize = block->bp_block;
1466         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
1467         /* Calculate record id of first and last block. */
1468         first_rec = first_trk = req->sector >> block->s2b_shift;
1469         first_offs = sector_div(first_trk, blk_per_trk);
1470         last_rec = last_trk =
1471                 (req->sector + req->nr_sectors - 1) >> block->s2b_shift;
1472         last_offs = sector_div(last_trk, blk_per_trk);
1473         /* Check struct bio and count the number of blocks for the request. */
1474         count = 0;
1475         cidaw = 0;
1476         rq_for_each_segment(bv, req, iter) {
1477                 if (bv->bv_len & (blksize - 1))
1478                         /* Eckd can only do full blocks. */
1479                         return ERR_PTR(-EINVAL);
1480                 count += bv->bv_len >> (block->s2b_shift + 9);
1481 #if defined(CONFIG_64BIT)
1482                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
1483                         cidaw += bv->bv_len >> (block->s2b_shift + 9);
1484 #endif
1485         }
1486         /* Paranoia. */
1487         if (count != last_rec - first_rec + 1)
1488                 return ERR_PTR(-EINVAL);
1489
1490         /* use the prefix command if available */
1491         use_prefix = private->features.feature[8] & 0x01;
1492         if (use_prefix) {
1493                 /* 1x prefix + number of blocks */
1494                 cplength = 2 + count;
1495                 /* 1x prefix + cidaws*sizeof(long) */
1496                 datasize = sizeof(struct PFX_eckd_data) +
1497                         sizeof(struct LO_eckd_data) +
1498                         cidaw * sizeof(unsigned long);
1499         } else {
1500                 /* 1x define extent + 1x locate record + number of blocks */
1501                 cplength = 2 + count;
1502                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
1503                 datasize = sizeof(struct DE_eckd_data) +
1504                         sizeof(struct LO_eckd_data) +
1505                         cidaw * sizeof(unsigned long);
1506         }
1507         /* Find out the number of additional locate record ccws for cdl. */
1508         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
1509                 if (last_rec >= 2*blk_per_trk)
1510                         count = 2*blk_per_trk - first_rec;
1511                 cplength += count;
1512                 datasize += count*sizeof(struct LO_eckd_data);
1513         }
1514         /* Allocate the ccw request. */
1515         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1516                                    cplength, datasize, startdev);
1517         if (IS_ERR(cqr))
1518                 return cqr;
1519         ccw = cqr->cpaddr;
1520         /* First ccw is define extent or prefix. */
1521         if (use_prefix) {
1522                 if (prefix(ccw++, cqr->data, first_trk,
1523                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
1524                         /* Clock not in sync and XRC is enabled.
1525                          * Try again later.
1526                          */
1527                         dasd_sfree_request(cqr, startdev);
1528                         return ERR_PTR(-EAGAIN);
1529                 }
1530                 idaws = (unsigned long *) (cqr->data +
1531                                            sizeof(struct PFX_eckd_data));
1532         } else {
1533                 if (define_extent(ccw++, cqr->data, first_trk,
1534                                   last_trk, cmd, startdev) == -EAGAIN) {
1535                         /* Clock not in sync and XRC is enabled.
1536                          * Try again later.
1537                          */
1538                         dasd_sfree_request(cqr, startdev);
1539                         return ERR_PTR(-EAGAIN);
1540                 }
1541                 idaws = (unsigned long *) (cqr->data +
1542                                            sizeof(struct DE_eckd_data));
1543         }
1544         /* Build locate_record+read/write/ccws. */
1545         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
1546         recid = first_rec;
1547         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
1548                 /* Only standard blocks so there is just one locate record. */
1549                 ccw[-1].flags |= CCW_FLAG_CC;
1550                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
1551                               last_rec - recid + 1, cmd, basedev, blksize);
1552         }
1553         rq_for_each_segment(bv, req, iter) {
1554                 dst = page_address(bv->bv_page) + bv->bv_offset;
1555                 if (dasd_page_cache) {
1556                         char *copy = kmem_cache_alloc(dasd_page_cache,
1557                                                       GFP_DMA | __GFP_NOWARN);
1558                         if (copy && rq_data_dir(req) == WRITE)
1559                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
1560                         if (copy)
1561                                 dst = copy + bv->bv_offset;
1562                 }
1563                 for (off = 0; off < bv->bv_len; off += blksize) {
1564                         sector_t trkid = recid;
1565                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
1566                         rcmd = cmd;
1567                         count = blksize;
1568                         /* Locate record for cdl special block ? */
1569                         if (private->uses_cdl && recid < 2*blk_per_trk) {
1570                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
1571                                         rcmd |= 0x8;
1572                                         count = dasd_eckd_cdl_reclen(recid);
1573                                         if (count < blksize &&
1574                                             rq_data_dir(req) == READ)
1575                                                 memset(dst + count, 0xe5,
1576                                                        blksize - count);
1577                                 }
1578                                 ccw[-1].flags |= CCW_FLAG_CC;
1579                                 locate_record(ccw++, LO_data++,
1580                                               trkid, recoffs + 1,
1581                                               1, rcmd, basedev, count);
1582                         }
1583                         /* Locate record for standard blocks ? */
1584                         if (private->uses_cdl && recid == 2*blk_per_trk) {
1585                                 ccw[-1].flags |= CCW_FLAG_CC;
1586                                 locate_record(ccw++, LO_data++,
1587                                               trkid, recoffs + 1,
1588                                               last_rec - recid + 1,
1589                                               cmd, basedev, count);
1590                         }
1591                         /* Read/write ccw. */
1592                         ccw[-1].flags |= CCW_FLAG_CC;
1593                         ccw->cmd_code = rcmd;
1594                         ccw->count = count;
1595                         if (idal_is_needed(dst, blksize)) {
1596                                 ccw->cda = (__u32)(addr_t) idaws;
1597                                 ccw->flags = CCW_FLAG_IDA;
1598                                 idaws = idal_create_words(idaws, dst, blksize);
1599                         } else {
1600                                 ccw->cda = (__u32)(addr_t) dst;
1601                                 ccw->flags = 0;
1602                         }
1603                         ccw++;
1604                         dst += blksize;
1605                         recid++;
1606                 }
1607         }
1608         if (req->cmd_flags & REQ_FAILFAST)
1609                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1610         cqr->startdev = startdev;
1611         cqr->memdev = startdev;
1612         cqr->block = block;
1613         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
1614         cqr->lpm = private->path_data.ppm;
1615         cqr->retries = 256;
1616         cqr->buildclk = get_clock();
1617         cqr->status = DASD_CQR_FILLED;
1618         return cqr;
1619 }
1620
1621 static int
1622 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
1623 {
1624         struct dasd_eckd_private *private;
1625         struct ccw1 *ccw;
1626         struct req_iterator iter;
1627         struct bio_vec *bv;
1628         char *dst, *cda;
1629         unsigned int blksize, blk_per_trk, off;
1630         sector_t recid;
1631         int status;
1632
1633         if (!dasd_page_cache)
1634                 goto out;
1635         private = (struct dasd_eckd_private *) cqr->block->base->private;
1636         blksize = cqr->block->bp_block;
1637         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
1638         recid = req->sector >> cqr->block->s2b_shift;
1639         ccw = cqr->cpaddr;
1640         /* Skip over define extent & locate record. */
1641         ccw++;
1642         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
1643                 ccw++;
1644         rq_for_each_segment(bv, req, iter) {
1645                 dst = page_address(bv->bv_page) + bv->bv_offset;
1646                 for (off = 0; off < bv->bv_len; off += blksize) {
1647                         /* Skip locate record. */
1648                         if (private->uses_cdl && recid <= 2*blk_per_trk)
1649                                 ccw++;
1650                         if (dst) {
1651                                 if (ccw->flags & CCW_FLAG_IDA)
1652                                         cda = *((char **)((addr_t) ccw->cda));
1653                                 else
1654                                         cda = (char *)((addr_t) ccw->cda);
1655                                 if (dst != cda) {
1656                                         if (rq_data_dir(req) == READ)
1657                                                 memcpy(dst, cda, bv->bv_len);
1658                                         kmem_cache_free(dasd_page_cache,
1659                                             (void *)((addr_t)cda & PAGE_MASK));
1660                                 }
1661                                 dst = NULL;
1662                         }
1663                         ccw++;
1664                         recid++;
1665                 }
1666         }
1667 out:
1668         status = cqr->status == DASD_CQR_DONE;
1669         dasd_sfree_request(cqr, cqr->memdev);
1670         return status;
1671 }
1672
1673 /*
1674  * Modify ccw chain in cqr so it can be started on a base device.
1675  *
1676  * Note that this is not enough to restart the cqr!
1677  * Either reset cqr->startdev as well (summary unit check handling)
1678  * or restart via separate cqr (as in ERP handling).
1679  */
1680 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
1681 {
1682         struct ccw1 *ccw;
1683         struct PFX_eckd_data *pfxdata;
1684
1685         ccw = cqr->cpaddr;
1686         pfxdata = cqr->data;
1687
1688         if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
1689                 pfxdata->validity.verify_base = 0;
1690                 pfxdata->validity.hyper_pav = 0;
1691         }
1692 }
1693
1694 #define DASD_ECKD_CHANQ_MAX_SIZE 4
1695
1696 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
1697                                                      struct dasd_block *block,
1698                                                      struct request *req)
1699 {
1700         struct dasd_eckd_private *private;
1701         struct dasd_device *startdev;
1702         unsigned long flags;
1703         struct dasd_ccw_req *cqr;
1704
1705         startdev = dasd_alias_get_start_dev(base);
1706         if (!startdev)
1707                 startdev = base;
1708         private = (struct dasd_eckd_private *) startdev->private;
1709         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
1710                 return ERR_PTR(-EBUSY);
1711
1712         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
1713         private->count++;
1714         cqr = dasd_eckd_build_cp(startdev, block, req);
1715         if (IS_ERR(cqr))
1716                 private->count--;
1717         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
1718         return cqr;
1719 }
1720
1721 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
1722                                    struct request *req)
1723 {
1724         struct dasd_eckd_private *private;
1725         unsigned long flags;
1726
1727         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
1728         private = (struct dasd_eckd_private *) cqr->memdev->private;
1729         private->count--;
1730         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
1731         return dasd_eckd_free_cp(cqr, req);
1732 }
1733
1734 static int
1735 dasd_eckd_fill_info(struct dasd_device * device,
1736                     struct dasd_information2_t * info)
1737 {
1738         struct dasd_eckd_private *private;
1739
1740         private = (struct dasd_eckd_private *) device->private;
1741         info->label_block = 2;
1742         info->FBA_layout = private->uses_cdl ? 0 : 1;
1743         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
1744         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
1745         memcpy(info->characteristics, &private->rdc_data,
1746                sizeof(struct dasd_eckd_characteristics));
1747         info->confdata_size = sizeof(struct dasd_eckd_confdata);
1748         memcpy(info->configuration_data, &private->conf_data,
1749                sizeof(struct dasd_eckd_confdata));
1750         return 0;
1751 }
1752
1753 /*
1754  * SECTION: ioctl functions for eckd devices.
1755  */
1756
1757 /*
1758  * Release device ioctl.
1759  * Buils a channel programm to releases a prior reserved
1760  * (see dasd_eckd_reserve) device.
1761  */
1762 static int
1763 dasd_eckd_release(struct dasd_device *device)
1764 {
1765         struct dasd_ccw_req *cqr;
1766         int rc;
1767
1768         if (!capable(CAP_SYS_ADMIN))
1769                 return -EACCES;
1770
1771         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1772                                    1, 32, device);
1773         if (IS_ERR(cqr)) {
1774                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1775                             "Could not allocate initialization request");
1776                 return PTR_ERR(cqr);
1777         }
1778         cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RELEASE;
1779         cqr->cpaddr->flags |= CCW_FLAG_SLI;
1780         cqr->cpaddr->count = 32;
1781         cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1782         cqr->startdev = device;
1783         cqr->memdev = device;
1784         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1785         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1786         cqr->retries = 2;       /* set retry counter to enable basic ERP */
1787         cqr->expires = 2 * HZ;
1788         cqr->buildclk = get_clock();
1789         cqr->status = DASD_CQR_FILLED;
1790
1791         rc = dasd_sleep_on_immediatly(cqr);
1792
1793         dasd_sfree_request(cqr, cqr->memdev);
1794         return rc;
1795 }
1796
1797 /*
1798  * Reserve device ioctl.
1799  * Options are set to 'synchronous wait for interrupt' and
1800  * 'timeout the request'. This leads to a terminate IO if
1801  * the interrupt is outstanding for a certain time.
1802  */
1803 static int
1804 dasd_eckd_reserve(struct dasd_device *device)
1805 {
1806         struct dasd_ccw_req *cqr;
1807         int rc;
1808
1809         if (!capable(CAP_SYS_ADMIN))
1810                 return -EACCES;
1811
1812         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1813                                    1, 32, device);
1814         if (IS_ERR(cqr)) {
1815                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1816                             "Could not allocate initialization request");
1817                 return PTR_ERR(cqr);
1818         }
1819         cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RESERVE;
1820         cqr->cpaddr->flags |= CCW_FLAG_SLI;
1821         cqr->cpaddr->count = 32;
1822         cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1823         cqr->startdev = device;
1824         cqr->memdev = device;
1825         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1826         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1827         cqr->retries = 2;       /* set retry counter to enable basic ERP */
1828         cqr->expires = 2 * HZ;
1829         cqr->buildclk = get_clock();
1830         cqr->status = DASD_CQR_FILLED;
1831
1832         rc = dasd_sleep_on_immediatly(cqr);
1833
1834         dasd_sfree_request(cqr, cqr->memdev);
1835         return rc;
1836 }
1837
1838 /*
1839  * Steal lock ioctl - unconditional reserve device.
1840  * Buils a channel programm to break a device's reservation.
1841  * (unconditional reserve)
1842  */
1843 static int
1844 dasd_eckd_steal_lock(struct dasd_device *device)
1845 {
1846         struct dasd_ccw_req *cqr;
1847         int rc;
1848
1849         if (!capable(CAP_SYS_ADMIN))
1850                 return -EACCES;
1851
1852         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1853                                    1, 32, device);
1854         if (IS_ERR(cqr)) {
1855                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1856                             "Could not allocate initialization request");
1857                 return PTR_ERR(cqr);
1858         }
1859         cqr->cpaddr->cmd_code = DASD_ECKD_CCW_SLCK;
1860         cqr->cpaddr->flags |= CCW_FLAG_SLI;
1861         cqr->cpaddr->count = 32;
1862         cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1863         cqr->startdev = device;
1864         cqr->memdev = device;
1865         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1866         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1867         cqr->retries = 2;       /* set retry counter to enable basic ERP */
1868         cqr->expires = 2 * HZ;
1869         cqr->buildclk = get_clock();
1870         cqr->status = DASD_CQR_FILLED;
1871
1872         rc = dasd_sleep_on_immediatly(cqr);
1873
1874         dasd_sfree_request(cqr, cqr->memdev);
1875         return rc;
1876 }
1877
1878 /*
1879  * Read performance statistics
1880  */
1881 static int
1882 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
1883 {
1884         struct dasd_psf_prssd_data *prssdp;
1885         struct dasd_rssd_perf_stats_t *stats;
1886         struct dasd_ccw_req *cqr;
1887         struct ccw1 *ccw;
1888         int rc;
1889
1890         cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1891                                    1 /* PSF */  + 1 /* RSSD */ ,
1892                                    (sizeof(struct dasd_psf_prssd_data) +
1893                                     sizeof(struct dasd_rssd_perf_stats_t)),
1894                                    device);
1895         if (IS_ERR(cqr)) {
1896                 DEV_MESSAGE(KERN_WARNING, device, "%s",
1897                             "Could not allocate initialization request");
1898                 return PTR_ERR(cqr);
1899         }
1900         cqr->startdev = device;
1901         cqr->memdev = device;
1902         cqr->retries = 0;
1903         cqr->expires = 10 * HZ;
1904
1905         /* Prepare for Read Subsystem Data */
1906         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1907         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1908         prssdp->order = PSF_ORDER_PRSSD;
1909         prssdp->suborder = 0x01;        /* Performance Statistics */
1910         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
1911
1912         ccw = cqr->cpaddr;
1913         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1914         ccw->count = sizeof(struct dasd_psf_prssd_data);
1915         ccw->flags |= CCW_FLAG_CC;
1916         ccw->cda = (__u32)(addr_t) prssdp;
1917
1918         /* Read Subsystem Data - Performance Statistics */
1919         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
1920         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
1921
1922         ccw++;
1923         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1924         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
1925         ccw->cda = (__u32)(addr_t) stats;
1926
1927         cqr->buildclk = get_clock();
1928         cqr->status = DASD_CQR_FILLED;
1929         rc = dasd_sleep_on(cqr);
1930         if (rc == 0) {
1931                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1932                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
1933                 if (copy_to_user(argp, stats,
1934                                  sizeof(struct dasd_rssd_perf_stats_t)))
1935                         rc = -EFAULT;
1936         }
1937         dasd_sfree_request(cqr, cqr->memdev);
1938         return rc;
1939 }
1940
1941 /*
1942  * Get attributes (cache operations)
1943  * Returnes the cache attributes used in Define Extend (DE).
1944  */
1945 static int
1946 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
1947 {
1948         struct dasd_eckd_private *private =
1949                 (struct dasd_eckd_private *)device->private;
1950         struct attrib_data_t attrib = private->attrib;
1951         int rc;
1952
1953         if (!capable(CAP_SYS_ADMIN))
1954                 return -EACCES;
1955         if (!argp)
1956                 return -EINVAL;
1957
1958         rc = 0;
1959         if (copy_to_user(argp, (long *) &attrib,
1960                          sizeof(struct attrib_data_t)))
1961                 rc = -EFAULT;
1962
1963         return rc;
1964 }
1965
1966 /*
1967  * Set attributes (cache operations)
1968  * Stores the attributes for cache operation to be used in Define Extend (DE).
1969  */
1970 static int
1971 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
1972 {
1973         struct dasd_eckd_private *private =
1974                 (struct dasd_eckd_private *)device->private;
1975         struct attrib_data_t attrib;
1976
1977         if (!capable(CAP_SYS_ADMIN))
1978                 return -EACCES;
1979         if (!argp)
1980                 return -EINVAL;
1981
1982         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
1983                 return -EFAULT;
1984         private->attrib = attrib;
1985
1986         DEV_MESSAGE(KERN_INFO, device,
1987                     "cache operation mode set to %x (%i cylinder prestage)",
1988                     private->attrib.operation, private->attrib.nr_cyl);
1989         return 0;
1990 }
1991
1992 static int
1993 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
1994 {
1995         struct dasd_device *device = block->base;
1996
1997         switch (cmd) {
1998         case BIODASDGATTR:
1999                 return dasd_eckd_get_attrib(device, argp);
2000         case BIODASDSATTR:
2001                 return dasd_eckd_set_attrib(device, argp);
2002         case BIODASDPSRD:
2003                 return dasd_eckd_performance(device, argp);
2004         case BIODASDRLSE:
2005                 return dasd_eckd_release(device);
2006         case BIODASDRSRV:
2007                 return dasd_eckd_reserve(device);
2008         case BIODASDSLCK:
2009                 return dasd_eckd_steal_lock(device);
2010         default:
2011                 return -ENOIOCTLCMD;
2012         }
2013 }
2014
2015 /*
2016  * Dump the range of CCWs into 'page' buffer
2017  * and return number of printed chars.
2018  */
2019 static int
2020 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
2021 {
2022         int len, count;
2023         char *datap;
2024
2025         len = 0;
2026         while (from <= to) {
2027                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2028                                " CCW %p: %08X %08X DAT:",
2029                                from, ((int *) from)[0], ((int *) from)[1]);
2030
2031                 /* get pointer to data (consider IDALs) */
2032                 if (from->flags & CCW_FLAG_IDA)
2033                         datap = (char *) *((addr_t *) (addr_t) from->cda);
2034                 else
2035                         datap = (char *) ((addr_t) from->cda);
2036
2037                 /* dump data (max 32 bytes) */
2038                 for (count = 0; count < from->count && count < 32; count++) {
2039                         if (count % 8 == 0) len += sprintf(page + len, " ");
2040                         if (count % 4 == 0) len += sprintf(page + len, " ");
2041                         len += sprintf(page + len, "%02x", datap[count]);
2042                 }
2043                 len += sprintf(page + len, "\n");
2044                 from++;
2045         }
2046         return len;
2047 }
2048
2049 /*
2050  * Print sense data and related channel program.
2051  * Parts are printed because printk buffer is only 1024 bytes.
2052  */
2053 static void dasd_eckd_dump_sense(struct dasd_device *device,
2054                                  struct dasd_ccw_req *req, struct irb *irb)
2055 {
2056         char *page;
2057         struct ccw1 *first, *last, *fail, *from, *to;
2058         int len, sl, sct;
2059
2060         page = (char *) get_zeroed_page(GFP_ATOMIC);
2061         if (page == NULL) {
2062                 DEV_MESSAGE(KERN_ERR, device, " %s",
2063                             "No memory to dump sense data");
2064                 return;
2065         }
2066         /* dump the sense data */
2067         len = sprintf(page,  KERN_ERR PRINTK_HEADER
2068                       " I/O status report for device %s:\n",
2069                       device->cdev->dev.bus_id);
2070         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2071                        " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
2072                        irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
2073         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2074                        " device %s: Failing CCW: %p\n",
2075                        device->cdev->dev.bus_id,
2076                        (void *) (addr_t) irb->scsw.cmd.cpa);
2077         if (irb->esw.esw0.erw.cons) {
2078                 for (sl = 0; sl < 4; sl++) {
2079                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
2080                                        " Sense(hex) %2d-%2d:",
2081                                        (8 * sl), ((8 * sl) + 7));
2082
2083                         for (sct = 0; sct < 8; sct++) {
2084                                 len += sprintf(page + len, " %02x",
2085                                                irb->ecw[8 * sl + sct]);
2086                         }
2087                         len += sprintf(page + len, "\n");
2088                 }
2089
2090                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
2091                         /* 24 Byte Sense Data */
2092                         sprintf(page + len, KERN_ERR PRINTK_HEADER
2093                                 " 24 Byte: %x MSG %x, "
2094                                 "%s MSGb to SYSOP\n",
2095                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
2096                                 irb->ecw[1] & 0x10 ? "" : "no");
2097                 } else {
2098                         /* 32 Byte Sense Data */
2099                         sprintf(page + len, KERN_ERR PRINTK_HEADER
2100                                 " 32 Byte: Format: %x "
2101                                 "Exception class %x\n",
2102                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
2103                 }
2104         } else {
2105                 sprintf(page + len, KERN_ERR PRINTK_HEADER
2106                         " SORRY - NO VALID SENSE AVAILABLE\n");
2107         }
2108         printk("%s", page);
2109
2110         if (req) {
2111                 /* req == NULL for unsolicited interrupts */
2112                 /* dump the Channel Program (max 140 Bytes per line) */
2113                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
2114                 first = req->cpaddr;
2115                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
2116                 to = min(first + 6, last);
2117                 len = sprintf(page,  KERN_ERR PRINTK_HEADER
2118                               " Related CP in req: %p\n", req);
2119                 dasd_eckd_dump_ccw_range(first, to, page + len);
2120                 printk("%s", page);
2121
2122                 /* print failing CCW area (maximum 4) */
2123                 /* scsw->cda is either valid or zero  */
2124                 len = 0;
2125                 from = ++to;
2126                 fail = (struct ccw1 *)(addr_t)
2127                                 irb->scsw.cmd.cpa; /* failing CCW */
2128                 if (from <  fail - 2) {
2129                         from = fail - 2;     /* there is a gap - print header */
2130                         len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
2131                 }
2132                 to = min(fail + 1, last);
2133                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
2134
2135                 /* print last CCWs (maximum 2) */
2136                 from = max(from, ++to);
2137                 if (from < last - 1) {
2138                         from = last - 1;     /* there is a gap - print header */
2139                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
2140                 }
2141                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
2142                 if (len > 0)
2143                         printk("%s", page);
2144         }
2145         free_page((unsigned long) page);
2146 }
2147
2148 /*
2149  * max_blocks is dependent on the amount of storage that is available
2150  * in the static io buffer for each device. Currently each device has
2151  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
2152  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
2153  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
2154  * addition we have one define extent ccw + 16 bytes of data and one
2155  * locate record ccw + 16 bytes of data. That makes:
2156  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
2157  * We want to fit two into the available memory so that we can immediately
2158  * start the next request if one finishes off. That makes 249.5 blocks
2159  * for one request. Give a little safety and the result is 240.
2160  */
2161 static struct dasd_discipline dasd_eckd_discipline = {
2162         .owner = THIS_MODULE,
2163         .name = "ECKD",
2164         .ebcname = "ECKD",
2165         .max_blocks = 240,
2166         .check_device = dasd_eckd_check_characteristics,
2167         .uncheck_device = dasd_eckd_uncheck_device,
2168         .do_analysis = dasd_eckd_do_analysis,
2169         .ready_to_online = dasd_eckd_ready_to_online,
2170         .online_to_ready = dasd_eckd_online_to_ready,
2171         .fill_geometry = dasd_eckd_fill_geometry,
2172         .start_IO = dasd_start_IO,
2173         .term_IO = dasd_term_IO,
2174         .handle_terminated_request = dasd_eckd_handle_terminated_request,
2175         .format_device = dasd_eckd_format_device,
2176         .erp_action = dasd_eckd_erp_action,
2177         .erp_postaction = dasd_eckd_erp_postaction,
2178         .handle_unsolicited_interrupt = dasd_eckd_handle_unsolicited_interrupt,
2179         .build_cp = dasd_eckd_build_alias_cp,
2180         .free_cp = dasd_eckd_free_alias_cp,
2181         .dump_sense = dasd_eckd_dump_sense,
2182         .fill_info = dasd_eckd_fill_info,
2183         .ioctl = dasd_eckd_ioctl,
2184 };
2185
2186 static int __init
2187 dasd_eckd_init(void)
2188 {
2189         ASCEBC(dasd_eckd_discipline.ebcname, 4);
2190         return ccw_driver_register(&dasd_eckd_driver);
2191 }
2192
2193 static void __exit
2194 dasd_eckd_cleanup(void)
2195 {
2196         ccw_driver_unregister(&dasd_eckd_driver);
2197 }
2198
2199 module_init(dasd_eckd_init);
2200 module_exit(dasd_eckd_cleanup);