drivers/s390/block/dasd_eckd.c

   1 /*
   2  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   3  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   4  *                  Carsten Otte <Cotte@de.ibm.com>
   5  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   6  * Bugreports.to..: <Linux390@de.ibm.com>
   7  * Copyright IBM Corp. 1999, 2009
   8  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
   9  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
  10  */
  11
  12 #define KMSG_COMPONENT "dasd-eckd"
  13
  14 #include <linux/stddef.h>
  15 #include <linux/kernel.h>
  16 #include <linux/slab.h>
  17 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  18 #include <linux/bio.h>
  19 #include <linux/module.h>
  20 #include <linux/compat.h>
  21 #include <linux/init.h>
  22
  23 #include <asm/css_chars.h>
  24 #include <asm/debug.h>
  25 #include <asm/idals.h>
  26 #include <asm/ebcdic.h>
  27 #include <asm/io.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/cio.h>
  30 #include <asm/ccwdev.h>
  31 #include <asm/itcw.h>
  32
  33 #include "dasd_int.h"
  34 #include "dasd_eckd.h"
  35
  36 #ifdef PRINTK_HEADER
  37 #undef PRINTK_HEADER
  38 #endif                          /* PRINTK_HEADER */
  39 #define PRINTK_HEADER "dasd(eckd):"
  40
  41 #define ECKD_C0(i) (i->home_bytes)
  42 #define ECKD_F(i) (i->formula)
  43 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
  44                     (i->factors.f_0x02.f1))
  45 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
  46                     (i->factors.f_0x02.f2))
  47 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
  48                     (i->factors.f_0x02.f3))
  49 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
  50 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
  51 #define ECKD_F6(i) (i->factor6)
  52 #define ECKD_F7(i) (i->factor7)
  53 #define ECKD_F8(i) (i->factor8)
  54
  55 /*
  56  * raw track access always map to 64k in memory
  57  * so it maps to 16 blocks of 4k per track
  58  */
  59 #define DASD_RAW_BLOCK_PER_TRACK 16
  60 #define DASD_RAW_BLOCKSIZE 4096
  61 /* 64k are 128 x 512 byte sectors  */
  62 #define DASD_RAW_SECTORS_PER_TRACK 128
  63
  64 MODULE_LICENSE("GPL");
  65
  66 static struct dasd_discipline dasd_eckd_discipline;
  67
  68 /* The ccw bus type uses this table to find devices that it sends to
  69  * dasd_eckd_probe */
  70 static struct ccw_device_id dasd_eckd_ids[] = {
  71         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
  72         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
  73         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
  74         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
  75         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
  76         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
  77         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
  78         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
  79         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
  80         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
  81         { /* end of list */ },
  82 };
  83
  84 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  85
  86 static struct ccw_driver dasd_eckd_driver; /* see below */
  87
  88 static void *rawpadpage;
  89
  90 #define INIT_CQR_OK 0
  91 #define INIT_CQR_UNFORMATTED 1
  92 #define INIT_CQR_ERROR 2
  93
  94 /* emergency request for reserve/release */
  95 static struct {
  96         struct dasd_ccw_req cqr;
  97         struct ccw1 ccw;
  98         char data[32];
  99 } *dasd_reserve_req;
 100 static DEFINE_MUTEX(dasd_reserve_mutex);
 101
 102 /* definitions for the path verification worker */
 103 struct path_verification_work_data {
 104         struct work_struct worker;
 105         struct dasd_device *device;
 106         struct dasd_ccw_req cqr;
 107         struct ccw1 ccw;
 108         __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
 109         int isglobal;
 110         __u8 tbvpm;
 111 };
 112 static struct path_verification_work_data *path_verification_worker;
 113 static DEFINE_MUTEX(dasd_path_verification_mutex);
 114
 115 /* initial attempt at a probe function. this can be simplified once
 116  * the other detection code is gone */
 117 static int
 118 dasd_eckd_probe (struct ccw_device *cdev)
 119 {
 120         int ret;
 121
 122         /* set ECKD specific ccw-device options */
 123         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
 124                                      CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
 125         if (ret) {
 126                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
 127                                 "dasd_eckd_probe: could not set "
 128                                 "ccw-device options");
 129                 return ret;
 130         }
 131         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
 132         return ret;
 133 }
 134
 135 static int
 136 dasd_eckd_set_online(struct ccw_device *cdev)
 137 {
 138         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
 139 }
 140
 141 static const int sizes_trk0[] = { 28, 148, 84 };
 142 #define LABEL_SIZE 140
 143
 144 /* head and record addresses of count_area read in analysis ccw */
 145 static const int count_area_head[] = { 0, 0, 0, 0, 2 };
 146 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
 147
 148 static inline unsigned int
 149 round_up_multiple(unsigned int no, unsigned int mult)
 150 {
 151         int rem = no % mult;
 152         return (rem ? no - rem + mult : no);
 153 }
 154
 155 static inline unsigned int
 156 ceil_quot(unsigned int d1, unsigned int d2)
 157 {
 158         return (d1 + (d2 - 1)) / d2;
 159 }
 160
 161 static unsigned int
 162 recs_per_track(struct dasd_eckd_characteristics * rdc,
 163                unsigned int kl, unsigned int dl)
 164 {
 165         int dn, kn;
 166
 167         switch (rdc->dev_type) {
 168         case 0x3380:
 169                 if (kl)
 170                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 171                                        ceil_quot(dl + 12, 32));
 172                 else
 173                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 174         case 0x3390:
 175                 dn = ceil_quot(dl + 6, 232) + 1;
 176                 if (kl) {
 177                         kn = ceil_quot(kl + 6, 232) + 1;
 178                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 179                                        9 + ceil_quot(dl + 6 * dn, 34));
 180                 } else
 181                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 182         case 0x9345:
 183                 dn = ceil_quot(dl + 6, 232) + 1;
 184                 if (kl) {
 185                         kn = ceil_quot(kl + 6, 232) + 1;
 186                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 187                                        ceil_quot(dl + 6 * dn, 34));
 188                 } else
 189                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 190         }
 191         return 0;
 192 }
 193
 194 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
 195 {
 196         geo->cyl = (__u16) cyl;
 197         geo->head = cyl >> 16;
 198         geo->head <<= 4;
 199         geo->head |= head;
 200 }
 201
 202 static int
 203 check_XRC (struct ccw1         *de_ccw,
 204            struct DE_eckd_data *data,
 205            struct dasd_device  *device)
 206 {
 207         struct dasd_eckd_private *private;
 208         int rc;
 209
 210         private = (struct dasd_eckd_private *) device->private;
 211         if (!private->rdc_data.facilities.XRC_supported)
 212                 return 0;
 213
 214         /* switch on System Time Stamp - needed for XRC Support */
 215         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 216         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 217
 218         rc = get_sync_clock(&data->ep_sys_time);
 219         /* Ignore return code if sync clock is switched off. */
 220         if (rc == -EOPNOTSUPP || rc == -EACCES)
 221                 rc = 0;
 222
 223         de_ccw->count = sizeof(struct DE_eckd_data);
 224         de_ccw->flags |= CCW_FLAG_SLI;
 225         return rc;
 226 }
 227
 228 static int
 229 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
 230               unsigned int totrk, int cmd, struct dasd_device *device)
 231 {
 232         struct dasd_eckd_private *private;
 233         u32 begcyl, endcyl;
 234         u16 heads, beghead, endhead;
 235         int rc = 0;
 236
 237         private = (struct dasd_eckd_private *) device->private;
 238
 239         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 240         ccw->flags = 0;
 241         ccw->count = 16;
 242         ccw->cda = (__u32) __pa(data);
 243
 244         memset(data, 0, sizeof(struct DE_eckd_data));
 245         switch (cmd) {
 246         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 247         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 248         case DASD_ECKD_CCW_READ:
 249         case DASD_ECKD_CCW_READ_MT:
 250         case DASD_ECKD_CCW_READ_CKD:
 251         case DASD_ECKD_CCW_READ_CKD_MT:
 252         case DASD_ECKD_CCW_READ_KD:
 253         case DASD_ECKD_CCW_READ_KD_MT:
 254         case DASD_ECKD_CCW_READ_COUNT:
 255                 data->mask.perm = 0x1;
 256                 data->attributes.operation = private->attrib.operation;
 257                 break;
 258         case DASD_ECKD_CCW_WRITE:
 259         case DASD_ECKD_CCW_WRITE_MT:
 260         case DASD_ECKD_CCW_WRITE_KD:
 261         case DASD_ECKD_CCW_WRITE_KD_MT:
 262                 data->mask.perm = 0x02;
 263                 data->attributes.operation = private->attrib.operation;
 264                 rc = check_XRC (ccw, data, device);
 265                 break;
 266         case DASD_ECKD_CCW_WRITE_CKD:
 267         case DASD_ECKD_CCW_WRITE_CKD_MT:
 268                 data->attributes.operation = DASD_BYPASS_CACHE;
 269                 rc = check_XRC (ccw, data, device);
 270                 break;
 271         case DASD_ECKD_CCW_ERASE:
 272         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 273         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 274                 data->mask.perm = 0x3;
 275                 data->mask.auth = 0x1;
 276                 data->attributes.operation = DASD_BYPASS_CACHE;
 277                 rc = check_XRC (ccw, data, device);
 278                 break;
 279         default:
 280                 dev_err(&device->cdev->dev,
 281                         "0x%x is not a known command\n", cmd);
 282                 break;
 283         }
 284
 285         data->attributes.mode = 0x3;    /* ECKD */
 286
 287         if ((private->rdc_data.cu_type == 0x2105 ||
 288              private->rdc_data.cu_type == 0x2107 ||
 289              private->rdc_data.cu_type == 0x1750)
 290             && !(private->uses_cdl && trk < 2))
 291                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 292
 293         heads = private->rdc_data.trk_per_cyl;
 294         begcyl = trk / heads;
 295         beghead = trk % heads;
 296         endcyl = totrk / heads;
 297         endhead = totrk % heads;
 298
 299         /* check for sequential prestage - enhance cylinder range */
 300         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 301             data->attributes.operation == DASD_SEQ_ACCESS) {
 302
 303                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
 304                         endcyl += private->attrib.nr_cyl;
 305                 else
 306                         endcyl = (private->real_cyl - 1);
 307         }
 308
 309         set_ch_t(&data->beg_ext, begcyl, beghead);
 310         set_ch_t(&data->end_ext, endcyl, endhead);
 311         return rc;
 312 }
 313
 314 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
 315                                struct dasd_device  *device)
 316 {
 317         struct dasd_eckd_private *private;
 318         int rc;
 319
 320         private = (struct dasd_eckd_private *) device->private;
 321         if (!private->rdc_data.facilities.XRC_supported)
 322                 return 0;
 323
 324         /* switch on System Time Stamp - needed for XRC Support */
 325         pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid'   */
 326         pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
 327         pfxdata->validity.time_stamp = 1;           /* 'Time Stamp Valid'   */
 328
 329         rc = get_sync_clock(&pfxdata->define_extent.ep_sys_time);
 330         /* Ignore return code if sync clock is switched off. */
 331         if (rc == -EOPNOTSUPP || rc == -EACCES)
 332                 rc = 0;
 333         return rc;
 334 }
 335
 336 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
 337                           unsigned int rec_on_trk, int count, int cmd,
 338                           struct dasd_device *device, unsigned int reclen,
 339                           unsigned int tlf)
 340 {
 341         struct dasd_eckd_private *private;
 342         int sector;
 343         int dn, d;
 344
 345         private = (struct dasd_eckd_private *) device->private;
 346
 347         memset(data, 0, sizeof(*data));
 348         sector = 0;
 349         if (rec_on_trk) {
 350                 switch (private->rdc_data.dev_type) {
 351                 case 0x3390:
 352                         dn = ceil_quot(reclen + 6, 232);
 353                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 354                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 355                         break;
 356                 case 0x3380:
 357                         d = 7 + ceil_quot(reclen + 12, 32);
 358                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 359                         break;
 360                 }
 361         }
 362         data->sector = sector;
 363         /* note: meaning of count depends on the operation
 364          *       for record based I/O it's the number of records, but for
 365          *       track based I/O it's the number of tracks
 366          */
 367         data->count = count;
 368         switch (cmd) {
 369         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 370                 data->operation.orientation = 0x3;
 371                 data->operation.operation = 0x03;
 372                 break;
 373         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 374                 data->operation.orientation = 0x3;
 375                 data->operation.operation = 0x16;
 376                 break;
 377         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 378                 data->operation.orientation = 0x1;
 379                 data->operation.operation = 0x03;
 380                 data->count++;
 381                 break;
 382         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 383                 data->operation.orientation = 0x3;
 384                 data->operation.operation = 0x16;
 385                 data->count++;
 386                 break;
 387         case DASD_ECKD_CCW_WRITE:
 388         case DASD_ECKD_CCW_WRITE_MT:
 389         case DASD_ECKD_CCW_WRITE_KD:
 390         case DASD_ECKD_CCW_WRITE_KD_MT:
 391                 data->auxiliary.length_valid = 0x1;
 392                 data->length = reclen;
 393                 data->operation.operation = 0x01;
 394                 break;
 395         case DASD_ECKD_CCW_WRITE_CKD:
 396         case DASD_ECKD_CCW_WRITE_CKD_MT:
 397                 data->auxiliary.length_valid = 0x1;
 398                 data->length = reclen;
 399                 data->operation.operation = 0x03;
 400                 break;
 401         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 402                 data->operation.orientation = 0x0;
 403                 data->operation.operation = 0x3F;
 404                 data->extended_operation = 0x11;
 405                 data->length = 0;
 406                 data->extended_parameter_length = 0x02;
 407                 if (data->count > 8) {
 408                         data->extended_parameter[0] = 0xFF;
 409                         data->extended_parameter[1] = 0xFF;
 410                         data->extended_parameter[1] <<= (16 - count);
 411                 } else {
 412                         data->extended_parameter[0] = 0xFF;
 413                         data->extended_parameter[0] <<= (8 - count);
 414                         data->extended_parameter[1] = 0x00;
 415                 }
 416                 data->sector = 0xFF;
 417                 break;
 418         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 419                 data->auxiliary.length_valid = 0x1;
 420                 data->length = reclen;  /* not tlf, as one might think */
 421                 data->operation.operation = 0x3F;
 422                 data->extended_operation = 0x23;
 423                 break;
 424         case DASD_ECKD_CCW_READ:
 425         case DASD_ECKD_CCW_READ_MT:
 426         case DASD_ECKD_CCW_READ_KD:
 427         case DASD_ECKD_CCW_READ_KD_MT:
 428                 data->auxiliary.length_valid = 0x1;
 429                 data->length = reclen;
 430                 data->operation.operation = 0x06;
 431                 break;
 432         case DASD_ECKD_CCW_READ_CKD:
 433         case DASD_ECKD_CCW_READ_CKD_MT:
 434                 data->auxiliary.length_valid = 0x1;
 435                 data->length = reclen;
 436                 data->operation.operation = 0x16;
 437                 break;
 438         case DASD_ECKD_CCW_READ_COUNT:
 439                 data->operation.operation = 0x06;
 440                 break;
 441         case DASD_ECKD_CCW_READ_TRACK:
 442                 data->operation.orientation = 0x1;
 443                 data->operation.operation = 0x0C;
 444                 data->extended_parameter_length = 0;
 445                 data->sector = 0xFF;
 446                 break;
 447         case DASD_ECKD_CCW_READ_TRACK_DATA:
 448                 data->auxiliary.length_valid = 0x1;
 449                 data->length = tlf;
 450                 data->operation.operation = 0x0C;
 451                 break;
 452         case DASD_ECKD_CCW_ERASE:
 453                 data->length = reclen;
 454                 data->auxiliary.length_valid = 0x1;
 455                 data->operation.operation = 0x0b;
 456                 break;
 457         default:
 458                 DBF_DEV_EVENT(DBF_ERR, device,
 459                             "fill LRE unknown opcode 0x%x", cmd);
 460                 BUG();
 461         }
 462         set_ch_t(&data->seek_addr,
 463                  trk / private->rdc_data.trk_per_cyl,
 464                  trk % private->rdc_data.trk_per_cyl);
 465         data->search_arg.cyl = data->seek_addr.cyl;
 466         data->search_arg.head = data->seek_addr.head;
 467         data->search_arg.record = rec_on_trk;
 468 }
 469
 470 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 471                       unsigned int trk, unsigned int totrk, int cmd,
 472                       struct dasd_device *basedev, struct dasd_device *startdev,
 473                       unsigned char format, unsigned int rec_on_trk, int count,
 474                       unsigned int blksize, unsigned int tlf)
 475 {
 476         struct dasd_eckd_private *basepriv, *startpriv;
 477         struct DE_eckd_data *dedata;
 478         struct LRE_eckd_data *lredata;
 479         u32 begcyl, endcyl;
 480         u16 heads, beghead, endhead;
 481         int rc = 0;
 482
 483         basepriv = (struct dasd_eckd_private *) basedev->private;
 484         startpriv = (struct dasd_eckd_private *) startdev->private;
 485         dedata = &pfxdata->define_extent;
 486         lredata = &pfxdata->locate_record;
 487
 488         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 489         ccw->flags = 0;
 490         if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
 491                 ccw->count = sizeof(*pfxdata) + 2;
 492                 ccw->cda = (__u32) __pa(pfxdata);
 493                 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
 494         } else {
 495                 ccw->count = sizeof(*pfxdata);
 496                 ccw->cda = (__u32) __pa(pfxdata);
 497                 memset(pfxdata, 0, sizeof(*pfxdata));
 498         }
 499
 500         /* prefix data */
 501         if (format > 1) {
 502                 DBF_DEV_EVENT(DBF_ERR, basedev,
 503                               "PFX LRE unknown format 0x%x", format);
 504                 BUG();
 505                 return -EINVAL;
 506         }
 507         pfxdata->format = format;
 508         pfxdata->base_address = basepriv->ned->unit_addr;
 509         pfxdata->base_lss = basepriv->ned->ID;
 510         pfxdata->validity.define_extent = 1;
 511
 512         /* private uid is kept up to date, conf_data may be outdated */
 513         if (startpriv->uid.type != UA_BASE_DEVICE) {
 514                 pfxdata->validity.verify_base = 1;
 515                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
 516                         pfxdata->validity.hyper_pav = 1;
 517         }
 518
 519         /* define extend data (mostly)*/
 520         switch (cmd) {
 521         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 522         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 523         case DASD_ECKD_CCW_READ:
 524         case DASD_ECKD_CCW_READ_MT:
 525         case DASD_ECKD_CCW_READ_CKD:
 526         case DASD_ECKD_CCW_READ_CKD_MT:
 527         case DASD_ECKD_CCW_READ_KD:
 528         case DASD_ECKD_CCW_READ_KD_MT:
 529         case DASD_ECKD_CCW_READ_COUNT:
 530                 dedata->mask.perm = 0x1;
 531                 dedata->attributes.operation = basepriv->attrib.operation;
 532                 break;
 533         case DASD_ECKD_CCW_READ_TRACK:
 534         case DASD_ECKD_CCW_READ_TRACK_DATA:
 535                 dedata->mask.perm = 0x1;
 536                 dedata->attributes.operation = basepriv->attrib.operation;
 537                 dedata->blk_size = 0;
 538                 break;
 539         case DASD_ECKD_CCW_WRITE:
 540         case DASD_ECKD_CCW_WRITE_MT:
 541         case DASD_ECKD_CCW_WRITE_KD:
 542         case DASD_ECKD_CCW_WRITE_KD_MT:
 543                 dedata->mask.perm = 0x02;
 544                 dedata->attributes.operation = basepriv->attrib.operation;
 545                 rc = check_XRC_on_prefix(pfxdata, basedev);
 546                 break;
 547         case DASD_ECKD_CCW_WRITE_CKD:
 548         case DASD_ECKD_CCW_WRITE_CKD_MT:
 549                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 550                 rc = check_XRC_on_prefix(pfxdata, basedev);
 551                 break;
 552         case DASD_ECKD_CCW_ERASE:
 553         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 554         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 555                 dedata->mask.perm = 0x3;
 556                 dedata->mask.auth = 0x1;
 557                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 558                 rc = check_XRC_on_prefix(pfxdata, basedev);
 559                 break;
 560         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 561                 dedata->mask.perm = 0x03;
 562                 dedata->attributes.operation = basepriv->attrib.operation;
 563                 dedata->blk_size = 0;
 564                 break;
 565         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 566                 dedata->mask.perm = 0x02;
 567                 dedata->attributes.operation = basepriv->attrib.operation;
 568                 dedata->blk_size = blksize;
 569                 rc = check_XRC_on_prefix(pfxdata, basedev);
 570                 break;
 571         default:
 572                 DBF_DEV_EVENT(DBF_ERR, basedev,
 573                             "PFX LRE unknown opcode 0x%x", cmd);
 574                 BUG();
 575                 return -EINVAL;
 576         }
 577
 578         dedata->attributes.mode = 0x3;  /* ECKD */
 579
 580         if ((basepriv->rdc_data.cu_type == 0x2105 ||
 581              basepriv->rdc_data.cu_type == 0x2107 ||
 582              basepriv->rdc_data.cu_type == 0x1750)
 583             && !(basepriv->uses_cdl && trk < 2))
 584                 dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
 585
 586         heads = basepriv->rdc_data.trk_per_cyl;
 587         begcyl = trk / heads;
 588         beghead = trk % heads;
 589         endcyl = totrk / heads;
 590         endhead = totrk % heads;
 591
 592         /* check for sequential prestage - enhance cylinder range */
 593         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
 594             dedata->attributes.operation == DASD_SEQ_ACCESS) {
 595
 596                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
 597                         endcyl += basepriv->attrib.nr_cyl;
 598                 else
 599                         endcyl = (basepriv->real_cyl - 1);
 600         }
 601
 602         set_ch_t(&dedata->beg_ext, begcyl, beghead);
 603         set_ch_t(&dedata->end_ext, endcyl, endhead);
 604
 605         if (format == 1) {
 606                 fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
 607                               basedev, blksize, tlf);
 608         }
 609
 610         return rc;
 611 }
 612
 613 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 614                   unsigned int trk, unsigned int totrk, int cmd,
 615                   struct dasd_device *basedev, struct dasd_device *startdev)
 616 {
 617         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
 618                           0, 0, 0, 0, 0);
 619 }
 620
 621 static void
 622 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
 623               unsigned int rec_on_trk, int no_rec, int cmd,
 624               struct dasd_device * device, int reclen)
 625 {
 626         struct dasd_eckd_private *private;
 627         int sector;
 628         int dn, d;
 629
 630         private = (struct dasd_eckd_private *) device->private;
 631
 632         DBF_DEV_EVENT(DBF_INFO, device,
 633                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 634                   trk, rec_on_trk, no_rec, cmd, reclen);
 635
 636         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 637         ccw->flags = 0;
 638         ccw->count = 16;
 639         ccw->cda = (__u32) __pa(data);
 640
 641         memset(data, 0, sizeof(struct LO_eckd_data));
 642         sector = 0;
 643         if (rec_on_trk) {
 644                 switch (private->rdc_data.dev_type) {
 645                 case 0x3390:
 646                         dn = ceil_quot(reclen + 6, 232);
 647                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 648                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 649                         break;
 650                 case 0x3380:
 651                         d = 7 + ceil_quot(reclen + 12, 32);
 652                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 653                         break;
 654                 }
 655         }
 656         data->sector = sector;
 657         data->count = no_rec;
 658         switch (cmd) {
 659         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 660                 data->operation.orientation = 0x3;
 661                 data->operation.operation = 0x03;
 662                 break;
 663         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 664                 data->operation.orientation = 0x3;
 665                 data->operation.operation = 0x16;
 666                 break;
 667         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 668                 data->operation.orientation = 0x1;
 669                 data->operation.operation = 0x03;
 670                 data->count++;
 671                 break;
 672         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 673                 data->operation.orientation = 0x3;
 674                 data->operation.operation = 0x16;
 675                 data->count++;
 676                 break;
 677         case DASD_ECKD_CCW_WRITE:
 678         case DASD_ECKD_CCW_WRITE_MT:
 679         case DASD_ECKD_CCW_WRITE_KD:
 680         case DASD_ECKD_CCW_WRITE_KD_MT:
 681                 data->auxiliary.last_bytes_used = 0x1;
 682                 data->length = reclen;
 683                 data->operation.operation = 0x01;
 684                 break;
 685         case DASD_ECKD_CCW_WRITE_CKD:
 686         case DASD_ECKD_CCW_WRITE_CKD_MT:
 687                 data->auxiliary.last_bytes_used = 0x1;
 688                 data->length = reclen;
 689                 data->operation.operation = 0x03;
 690                 break;
 691         case DASD_ECKD_CCW_READ:
 692         case DASD_ECKD_CCW_READ_MT:
 693         case DASD_ECKD_CCW_READ_KD:
 694         case DASD_ECKD_CCW_READ_KD_MT:
 695                 data->auxiliary.last_bytes_used = 0x1;
 696                 data->length = reclen;
 697                 data->operation.operation = 0x06;
 698                 break;
 699         case DASD_ECKD_CCW_READ_CKD:
 700         case DASD_ECKD_CCW_READ_CKD_MT:
 701                 data->auxiliary.last_bytes_used = 0x1;
 702                 data->length = reclen;
 703                 data->operation.operation = 0x16;
 704                 break;
 705         case DASD_ECKD_CCW_READ_COUNT:
 706                 data->operation.operation = 0x06;
 707                 break;
 708         case DASD_ECKD_CCW_ERASE:
 709                 data->length = reclen;
 710                 data->auxiliary.last_bytes_used = 0x1;
 711                 data->operation.operation = 0x0b;
 712                 break;
 713         default:
 714                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
 715                               "opcode 0x%x", cmd);
 716         }
 717         set_ch_t(&data->seek_addr,
 718                  trk / private->rdc_data.trk_per_cyl,
 719                  trk % private->rdc_data.trk_per_cyl);
 720         data->search_arg.cyl = data->seek_addr.cyl;
 721         data->search_arg.head = data->seek_addr.head;
 722         data->search_arg.record = rec_on_trk;
 723 }
 724
 725 /*
 726  * Returns 1 if the block is one of the special blocks that needs
 727  * to get read/written with the KD variant of the command.
 728  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 729  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 730  * Luckily the KD variants differ only by one bit (0x08) from the
 731  * normal variant. So don't wonder about code like:
 732  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 733  *         ccw->cmd_code |= 0x8;
 734  */
 735 static inline int
 736 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 737 {
 738         if (recid < 3)
 739                 return 1;
 740         if (recid < blk_per_trk)
 741                 return 0;
 742         if (recid < 2 * blk_per_trk)
 743                 return 1;
 744         return 0;
 745 }
 746
 747 /*
 748  * Returns the record size for the special blocks of the cdl format.
 749  * Only returns something useful if dasd_eckd_cdl_special is true
 750  * for the recid.
 751  */
 752 static inline int
 753 dasd_eckd_cdl_reclen(int recid)
 754 {
 755         if (recid < 3)
 756                 return sizes_trk0[recid];
 757         return LABEL_SIZE;
 758 }
 759 /* create unique id from private structure. */
 760 static void create_uid(struct dasd_eckd_private *private)
 761 {
 762         int count;
 763         struct dasd_uid *uid;
 764
 765         uid = &private->uid;
 766         memset(uid, 0, sizeof(struct dasd_uid));
 767         memcpy(uid->vendor, private->ned->HDA_manufacturer,
 768                sizeof(uid->vendor) - 1);
 769         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 770         memcpy(uid->serial, private->ned->HDA_location,
 771                sizeof(uid->serial) - 1);
 772         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 773         uid->ssid = private->gneq->subsystemID;
 774         uid->real_unit_addr = private->ned->unit_addr;
 775         if (private->sneq) {
 776                 uid->type = private->sneq->sua_flags;
 777                 if (uid->type == UA_BASE_PAV_ALIAS)
 778                         uid->base_unit_addr = private->sneq->base_unit_addr;
 779         } else {
 780                 uid->type = UA_BASE_DEVICE;
 781         }
 782         if (private->vdsneq) {
 783                 for (count = 0; count < 16; count++) {
 784                         sprintf(uid->vduit+2*count, "%02x",
 785                                 private->vdsneq->uit[count]);
 786                 }
 787         }
 788 }
 789
 790 /*
 791  * Generate device unique id that specifies the physical device.
 792  */
 793 static int dasd_eckd_generate_uid(struct dasd_device *device)
 794 {
 795         struct dasd_eckd_private *private;
 796         unsigned long flags;
 797
 798         private = (struct dasd_eckd_private *) device->private;
 799         if (!private)
 800                 return -ENODEV;
 801         if (!private->ned || !private->gneq)
 802                 return -ENODEV;
 803         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 804         create_uid(private);
 805         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 806         return 0;
 807 }
 808
 809 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
 810 {
 811         struct dasd_eckd_private *private;
 812         unsigned long flags;
 813
 814         if (device->private) {
 815                 private = (struct dasd_eckd_private *)device->private;
 816                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 817                 *uid = private->uid;
 818                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 819                 return 0;
 820         }
 821         return -EINVAL;
 822 }
 823
 824 /*
 825  * compare device UID with data of a given dasd_eckd_private structure
 826  * return 0 for match
 827  */
 828 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
 829                                       struct dasd_eckd_private *private)
 830 {
 831         struct dasd_uid device_uid;
 832
 833         create_uid(private);
 834         dasd_eckd_get_uid(device, &device_uid);
 835
 836         return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
 837 }
 838
 839 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
 840                                    struct dasd_ccw_req *cqr,
 841                                    __u8 *rcd_buffer,
 842                                    __u8 lpm)
 843 {
 844         struct ccw1 *ccw;
 845         /*
 846          * buffer has to start with EBCDIC "V1.0" to show
 847          * support for virtual device SNEQ
 848          */
 849         rcd_buffer[0] = 0xE5;
 850         rcd_buffer[1] = 0xF1;
 851         rcd_buffer[2] = 0x4B;
 852         rcd_buffer[3] = 0xF0;
 853
 854         ccw = cqr->cpaddr;
 855         ccw->cmd_code = DASD_ECKD_CCW_RCD;
 856         ccw->flags = 0;
 857         ccw->cda = (__u32)(addr_t)rcd_buffer;
 858         ccw->count = DASD_ECKD_RCD_DATA_SIZE;
 859         cqr->magic = DASD_ECKD_MAGIC;
 860
 861         cqr->startdev = device;
 862         cqr->memdev = device;
 863         cqr->block = NULL;
 864         cqr->expires = 10*HZ;
 865         cqr->lpm = lpm;
 866         cqr->retries = 256;
 867         cqr->buildclk = get_tod_clock();
 868         cqr->status = DASD_CQR_FILLED;
 869         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
 870 }
 871
 872 /*
 873  * Wakeup helper for read_conf
 874  * if the cqr is not done and needs some error recovery
 875  * the buffer has to be re-initialized with the EBCDIC "V1.0"
 876  * to show support for virtual device SNEQ
 877  */
 878 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
 879 {
 880         struct ccw1 *ccw;
 881         __u8 *rcd_buffer;
 882
 883         if (cqr->status !=  DASD_CQR_DONE) {
 884                 ccw = cqr->cpaddr;
 885                 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
 886                 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
 887
 888                 rcd_buffer[0] = 0xE5;
 889                 rcd_buffer[1] = 0xF1;
 890                 rcd_buffer[2] = 0x4B;
 891                 rcd_buffer[3] = 0xF0;
 892         }
 893         dasd_wakeup_cb(cqr, data);
 894 }
 895
 896 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
 897                                            struct dasd_ccw_req *cqr,
 898                                            __u8 *rcd_buffer,
 899                                            __u8 lpm)
 900 {
 901         struct ciw *ciw;
 902         int rc;
 903         /*
 904          * sanity check: scan for RCD command in extended SenseID data
 905          * some devices do not support RCD
 906          */
 907         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 908         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
 909                 return -EOPNOTSUPP;
 910
 911         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
 912         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 913         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
 914         cqr->retries = 5;
 915         cqr->callback = read_conf_cb;
 916         rc = dasd_sleep_on_immediatly(cqr);
 917         return rc;
 918 }
 919
 920 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 921                                    void **rcd_buffer,
 922                                    int *rcd_buffer_size, __u8 lpm)
 923 {
 924         struct ciw *ciw;
 925         char *rcd_buf = NULL;
 926         int ret;
 927         struct dasd_ccw_req *cqr;
 928
 929         /*
 930          * sanity check: scan for RCD command in extended SenseID data
 931          * some devices do not support RCD
 932          */
 933         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 934         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
 935                 ret = -EOPNOTSUPP;
 936                 goto out_error;
 937         }
 938         rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
 939         if (!rcd_buf) {
 940                 ret = -ENOMEM;
 941                 goto out_error;
 942         }
 943         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
 944                                    0, /* use rcd_buf as data ara */
 945                                    device);
 946         if (IS_ERR(cqr)) {
 947                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 948                               "Could not allocate RCD request");
 949                 ret = -ENOMEM;
 950                 goto out_error;
 951         }
 952         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
 953         cqr->callback = read_conf_cb;
 954         ret = dasd_sleep_on(cqr);
 955         /*
 956          * on success we update the user input parms
 957          */
 958         dasd_sfree_request(cqr, cqr->memdev);
 959         if (ret)
 960                 goto out_error;
 961
 962         *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
 963         *rcd_buffer = rcd_buf;
 964         return 0;
 965 out_error:
 966         kfree(rcd_buf);
 967         *rcd_buffer = NULL;
 968         *rcd_buffer_size = 0;
 969         return ret;
 970 }
 971
 972 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
 973 {
 974
 975         struct dasd_sneq *sneq;
 976         int i, count;
 977
 978         private->ned = NULL;
 979         private->sneq = NULL;
 980         private->vdsneq = NULL;
 981         private->gneq = NULL;
 982         count = private->conf_len / sizeof(struct dasd_sneq);
 983         sneq = (struct dasd_sneq *)private->conf_data;
 984         for (i = 0; i < count; ++i) {
 985                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 986                         private->sneq = sneq;
 987                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 988                         private->vdsneq = (struct vd_sneq *)sneq;
 989                 else if (sneq->flags.identifier == 2)
 990                         private->gneq = (struct dasd_gneq *)sneq;
 991                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 992                         private->ned = (struct dasd_ned *)sneq;
 993                 sneq++;
 994         }
 995         if (!private->ned || !private->gneq) {
 996                 private->ned = NULL;
 997                 private->sneq = NULL;
 998                 private->vdsneq = NULL;
 999                 private->gneq = NULL;
1000                 return -EINVAL;
1001         }
1002         return 0;
1003
1004 };
1005
1006 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
1007 {
1008         struct dasd_gneq *gneq;
1009         int i, count, found;
1010
1011         count = conf_len / sizeof(*gneq);
1012         gneq = (struct dasd_gneq *)conf_data;
1013         found = 0;
1014         for (i = 0; i < count; ++i) {
1015                 if (gneq->flags.identifier == 2) {
1016                         found = 1;
1017                         break;
1018                 }
1019                 gneq++;
1020         }
1021         if (found)
1022                 return ((char *)gneq)[18] & 0x07;
1023         else
1024                 return 0;
1025 }
1026
1027 static int dasd_eckd_read_conf(struct dasd_device *device)
1028 {
1029         void *conf_data;
1030         int conf_len, conf_data_saved;
1031         int rc, path_err;
1032         __u8 lpm, opm;
1033         struct dasd_eckd_private *private, path_private;
1034         struct dasd_path *path_data;
1035         struct dasd_uid *uid;
1036         char print_path_uid[60], print_device_uid[60];
1037
1038         private = (struct dasd_eckd_private *) device->private;
1039         path_data = &device->path_data;
1040         opm = ccw_device_get_path_mask(device->cdev);
1041         conf_data_saved = 0;
1042         path_err = 0;
1043         /* get configuration data per operational path */
1044         for (lpm = 0x80; lpm; lpm>>= 1) {
1045                 if (!(lpm & opm))
1046                         continue;
1047                 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1048                                              &conf_len, lpm);
1049                 if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
1050                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1051                                         "Read configuration data returned "
1052                                         "error %d", rc);
1053                         return rc;
1054                 }
1055                 if (conf_data == NULL) {
1056                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1057                                         "No configuration data "
1058                                         "retrieved");
1059                         /* no further analysis possible */
1060                         path_data->opm |= lpm;
1061                         continue;       /* no error */
1062                 }
1063                 /* save first valid configuration data */
1064                 if (!conf_data_saved) {
1065                         kfree(private->conf_data);
1066                         private->conf_data = conf_data;
1067                         private->conf_len = conf_len;
1068                         if (dasd_eckd_identify_conf_parts(private)) {
1069                                 private->conf_data = NULL;
1070                                 private->conf_len = 0;
1071                                 kfree(conf_data);
1072                                 continue;
1073                         }
1074                         /*
1075                          * build device UID that other path data
1076                          * can be compared to it
1077                          */
1078                         dasd_eckd_generate_uid(device);
1079                         conf_data_saved++;
1080                 } else {
1081                         path_private.conf_data = conf_data;
1082                         path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1083                         if (dasd_eckd_identify_conf_parts(
1084                                     &path_private)) {
1085                                 path_private.conf_data = NULL;
1086                                 path_private.conf_len = 0;
1087                                 kfree(conf_data);
1088                                 continue;
1089                         }
1090
1091                         if (dasd_eckd_compare_path_uid(
1092                                     device, &path_private)) {
1093                                 uid = &path_private.uid;
1094                                 if (strlen(uid->vduit) > 0)
1095                                         snprintf(print_path_uid,
1096                                                  sizeof(print_path_uid),
1097                                                  "%s.%s.%04x.%02x.%s",
1098                                                  uid->vendor, uid->serial,
1099                                                  uid->ssid, uid->real_unit_addr,
1100                                                  uid->vduit);
1101                                 else
1102                                         snprintf(print_path_uid,
1103                                                  sizeof(print_path_uid),
1104                                                  "%s.%s.%04x.%02x",
1105                                                  uid->vendor, uid->serial,
1106                                                  uid->ssid,
1107                                                  uid->real_unit_addr);
1108                                 uid = &private->uid;
1109                                 if (strlen(uid->vduit) > 0)
1110                                         snprintf(print_device_uid,
1111                                                  sizeof(print_device_uid),
1112                                                  "%s.%s.%04x.%02x.%s",
1113                                                  uid->vendor, uid->serial,
1114                                                  uid->ssid, uid->real_unit_addr,
1115                                                  uid->vduit);
1116                                 else
1117                                         snprintf(print_device_uid,
1118                                                  sizeof(print_device_uid),
1119                                                  "%s.%s.%04x.%02x",
1120                                                  uid->vendor, uid->serial,
1121                                                  uid->ssid,
1122                                                  uid->real_unit_addr);
1123                                 dev_err(&device->cdev->dev,
1124                                         "Not all channel paths lead to "
1125                                         "the same device, path %02X leads to "
1126                                         "device %s instead of %s\n", lpm,
1127                                         print_path_uid, print_device_uid);
1128                                 path_err = -EINVAL;
1129                                 continue;
1130                         }
1131
1132                         path_private.conf_data = NULL;
1133                         path_private.conf_len = 0;
1134                 }
1135                 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1136                 case 0x02:
1137                         path_data->npm |= lpm;
1138                         break;
1139                 case 0x03:
1140                         path_data->ppm |= lpm;
1141                         break;
1142                 }
1143                 path_data->opm |= lpm;
1144
1145                 if (conf_data != private->conf_data)
1146                         kfree(conf_data);
1147         }
1148
1149         return path_err;
1150 }
1151
1152 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1153 {
1154         struct dasd_eckd_private *private;
1155         int mdc;
1156         u32 fcx_max_data;
1157
1158         private = (struct dasd_eckd_private *) device->private;
1159         if (private->fcx_max_data) {
1160                 mdc = ccw_device_get_mdc(device->cdev, lpm);
1161                 if ((mdc < 0)) {
1162                         dev_warn(&device->cdev->dev,
1163                                  "Detecting the maximum data size for zHPF "
1164                                  "requests failed (rc=%d) for a new path %x\n",
1165                                  mdc, lpm);
1166                         return mdc;
1167                 }
1168                 fcx_max_data = mdc * FCX_MAX_DATA_FACTOR;
1169                 if (fcx_max_data < private->fcx_max_data) {
1170                         dev_warn(&device->cdev->dev,
1171                                  "The maximum data size for zHPF requests %u "
1172                                  "on a new path %x is below the active maximum "
1173                                  "%u\n", fcx_max_data, lpm,
1174                                  private->fcx_max_data);
1175                         return -EACCES;
1176                 }
1177         }
1178         return 0;
1179 }
1180
1181 static int rebuild_device_uid(struct dasd_device *device,
1182                               struct path_verification_work_data *data)
1183 {
1184         struct dasd_eckd_private *private;
1185         struct dasd_path *path_data;
1186         __u8 lpm, opm;
1187         int rc;
1188
1189         rc = -ENODEV;
1190         private = (struct dasd_eckd_private *) device->private;
1191         path_data = &device->path_data;
1192         opm = device->path_data.opm;
1193
1194         for (lpm = 0x80; lpm; lpm >>= 1) {
1195                 if (!(lpm & opm))
1196                         continue;
1197                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1198                 memset(&data->cqr, 0, sizeof(data->cqr));
1199                 data->cqr.cpaddr = &data->ccw;
1200                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1201                                                      data->rcd_buffer,
1202                                                      lpm);
1203
1204                 if (rc) {
1205                         if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1206                                 continue;
1207                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1208                                         "Read configuration data "
1209                                         "returned error %d", rc);
1210                         break;
1211                 }
1212                 memcpy(private->conf_data, data->rcd_buffer,
1213                        DASD_ECKD_RCD_DATA_SIZE);
1214                 if (dasd_eckd_identify_conf_parts(private)) {
1215                         rc = -ENODEV;
1216                 } else /* first valid path is enough */
1217                         break;
1218         }
1219
1220         if (!rc)
1221                 rc = dasd_eckd_generate_uid(device);
1222
1223         return rc;
1224 }
1225
1226 static void do_path_verification_work(struct work_struct *work)
1227 {
1228         struct path_verification_work_data *data;
1229         struct dasd_device *device;
1230         struct dasd_eckd_private path_private;
1231         struct dasd_uid *uid;
1232         __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1233         __u8 lpm, opm, npm, ppm, epm;
1234         unsigned long flags;
1235         char print_uid[60];
1236         int rc;
1237
1238         data = container_of(work, struct path_verification_work_data, worker);
1239         device = data->device;
1240
1241         /* delay path verification until device was resumed */
1242         if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1243                 schedule_work(work);
1244                 return;
1245         }
1246
1247         opm = 0;
1248         npm = 0;
1249         ppm = 0;
1250         epm = 0;
1251         for (lpm = 0x80; lpm; lpm >>= 1) {
1252                 if (!(lpm & data->tbvpm))
1253                         continue;
1254                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1255                 memset(&data->cqr, 0, sizeof(data->cqr));
1256                 data->cqr.cpaddr = &data->ccw;
1257                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1258                                                      data->rcd_buffer,
1259                                                      lpm);
1260                 if (!rc) {
1261                         switch (dasd_eckd_path_access(data->rcd_buffer,
1262                                                       DASD_ECKD_RCD_DATA_SIZE)
1263                                 ) {
1264                         case 0x02:
1265                                 npm |= lpm;
1266                                 break;
1267                         case 0x03:
1268                                 ppm |= lpm;
1269                                 break;
1270                         }
1271                         opm |= lpm;
1272                 } else if (rc == -EOPNOTSUPP) {
1273                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1274                                         "path verification: No configuration "
1275                                         "data retrieved");
1276                         opm |= lpm;
1277                 } else if (rc == -EAGAIN) {
1278                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1279                                         "path verification: device is stopped,"
1280                                         " try again later");
1281                         epm |= lpm;
1282                 } else {
1283                         dev_warn(&device->cdev->dev,
1284                                  "Reading device feature codes failed "
1285                                  "(rc=%d) for new path %x\n", rc, lpm);
1286                         continue;
1287                 }
1288                 if (verify_fcx_max_data(device, lpm)) {
1289                         opm &= ~lpm;
1290                         npm &= ~lpm;
1291                         ppm &= ~lpm;
1292                         continue;
1293                 }
1294
1295                 /*
1296                  * save conf_data for comparison after
1297                  * rebuild_device_uid may have changed
1298                  * the original data
1299                  */
1300                 memcpy(&path_rcd_buf, data->rcd_buffer,
1301                        DASD_ECKD_RCD_DATA_SIZE);
1302                 path_private.conf_data = (void *) &path_rcd_buf;
1303                 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1304                 if (dasd_eckd_identify_conf_parts(&path_private)) {
1305                         path_private.conf_data = NULL;
1306                         path_private.conf_len = 0;
1307                         continue;
1308                 }
1309
1310                 /*
1311                  * compare path UID with device UID only if at least
1312                  * one valid path is left
1313                  * in other case the device UID may have changed and
1314                  * the first working path UID will be used as device UID
1315                  */
1316                 if (device->path_data.opm &&
1317                     dasd_eckd_compare_path_uid(device, &path_private)) {
1318                         /*
1319                          * the comparison was not successful
1320                          * rebuild the device UID with at least one
1321                          * known path in case a z/VM hyperswap command
1322                          * has changed the device
1323                          *
1324                          * after this compare again
1325                          *
1326                          * if either the rebuild or the recompare fails
1327                          * the path can not be used
1328                          */
1329                         if (rebuild_device_uid(device, data) ||
1330                             dasd_eckd_compare_path_uid(
1331                                     device, &path_private)) {
1332                                 uid = &path_private.uid;
1333                                 if (strlen(uid->vduit) > 0)
1334                                         snprintf(print_uid, sizeof(print_uid),
1335                                                  "%s.%s.%04x.%02x.%s",
1336                                                  uid->vendor, uid->serial,
1337                                                  uid->ssid, uid->real_unit_addr,
1338                                                  uid->vduit);
1339                                 else
1340                                         snprintf(print_uid, sizeof(print_uid),
1341                                                  "%s.%s.%04x.%02x",
1342                                                  uid->vendor, uid->serial,
1343                                                  uid->ssid,
1344                                                  uid->real_unit_addr);
1345                                 dev_err(&device->cdev->dev,
1346                                         "The newly added channel path %02X "
1347                                         "will not be used because it leads "
1348                                         "to a different device %s\n",
1349                                         lpm, print_uid);
1350                                 opm &= ~lpm;
1351                                 npm &= ~lpm;
1352                                 ppm &= ~lpm;
1353                                 continue;
1354                         }
1355                 }
1356
1357                 /*
1358                  * There is a small chance that a path is lost again between
1359                  * above path verification and the following modification of
1360                  * the device opm mask. We could avoid that race here by using
1361                  * yet another path mask, but we rather deal with this unlikely
1362                  * situation in dasd_start_IO.
1363                  */
1364                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1365                 if (!device->path_data.opm && opm) {
1366                         device->path_data.opm = opm;
1367                         dasd_generic_path_operational(device);
1368                 } else
1369                         device->path_data.opm |= opm;
1370                 device->path_data.npm |= npm;
1371                 device->path_data.ppm |= ppm;
1372                 device->path_data.tbvpm |= epm;
1373                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1374         }
1375
1376         dasd_put_device(device);
1377         if (data->isglobal)
1378                 mutex_unlock(&dasd_path_verification_mutex);
1379         else
1380                 kfree(data);
1381 }
1382
1383 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1384 {
1385         struct path_verification_work_data *data;
1386
1387         data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1388         if (!data) {
1389                 if (mutex_trylock(&dasd_path_verification_mutex)) {
1390                         data = path_verification_worker;
1391                         data->isglobal = 1;
1392                 } else
1393                         return -ENOMEM;
1394         } else {
1395                 memset(data, 0, sizeof(*data));
1396                 data->isglobal = 0;
1397         }
1398         INIT_WORK(&data->worker, do_path_verification_work);
1399         dasd_get_device(device);
1400         data->device = device;
1401         data->tbvpm = lpm;
1402         schedule_work(&data->worker);
1403         return 0;
1404 }
1405
1406 static int dasd_eckd_read_features(struct dasd_device *device)
1407 {
1408         struct dasd_psf_prssd_data *prssdp;
1409         struct dasd_rssd_features *features;
1410         struct dasd_ccw_req *cqr;
1411         struct ccw1 *ccw;
1412         int rc;
1413         struct dasd_eckd_private *private;
1414
1415         private = (struct dasd_eckd_private *) device->private;
1416         memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1417         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1418                                    (sizeof(struct dasd_psf_prssd_data) +
1419                                     sizeof(struct dasd_rssd_features)),
1420                                    device);
1421         if (IS_ERR(cqr)) {
1422                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1423                                 "allocate initialization request");
1424                 return PTR_ERR(cqr);
1425         }
1426         cqr->startdev = device;
1427         cqr->memdev = device;
1428         cqr->block = NULL;
1429         cqr->retries = 256;
1430         cqr->expires = 10 * HZ;
1431
1432         /* Prepare for Read Subsystem Data */
1433         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1434         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1435         prssdp->order = PSF_ORDER_PRSSD;
1436         prssdp->suborder = 0x41;        /* Read Feature Codes */
1437         /* all other bytes of prssdp must be zero */
1438
1439         ccw = cqr->cpaddr;
1440         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1441         ccw->count = sizeof(struct dasd_psf_prssd_data);
1442         ccw->flags |= CCW_FLAG_CC;
1443         ccw->cda = (__u32)(addr_t) prssdp;
1444
1445         /* Read Subsystem Data - feature codes */
1446         features = (struct dasd_rssd_features *) (prssdp + 1);
1447         memset(features, 0, sizeof(struct dasd_rssd_features));
1448
1449         ccw++;
1450         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1451         ccw->count = sizeof(struct dasd_rssd_features);
1452         ccw->cda = (__u32)(addr_t) features;
1453
1454         cqr->buildclk = get_tod_clock();
1455         cqr->status = DASD_CQR_FILLED;
1456         rc = dasd_sleep_on(cqr);
1457         if (rc == 0) {
1458                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1459                 features = (struct dasd_rssd_features *) (prssdp + 1);
1460                 memcpy(&private->features, features,
1461                        sizeof(struct dasd_rssd_features));
1462         } else
1463                 dev_warn(&device->cdev->dev, "Reading device feature codes"
1464                          " failed with rc=%d\n", rc);
1465         dasd_sfree_request(cqr, cqr->memdev);
1466         return rc;
1467 }
1468
1469
1470 /*
1471  * Build CP for Perform Subsystem Function - SSC.
1472  */
1473 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1474                                                     int enable_pav)
1475 {
1476         struct dasd_ccw_req *cqr;
1477         struct dasd_psf_ssc_data *psf_ssc_data;
1478         struct ccw1 *ccw;
1479
1480         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1481                                   sizeof(struct dasd_psf_ssc_data),
1482                                   device);
1483
1484         if (IS_ERR(cqr)) {
1485                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1486                            "Could not allocate PSF-SSC request");
1487                 return cqr;
1488         }
1489         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1490         psf_ssc_data->order = PSF_ORDER_SSC;
1491         psf_ssc_data->suborder = 0xc0;
1492         if (enable_pav) {
1493                 psf_ssc_data->suborder |= 0x08;
1494                 psf_ssc_data->reserved[0] = 0x88;
1495         }
1496         ccw = cqr->cpaddr;
1497         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1498         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1499         ccw->count = 66;
1500
1501         cqr->startdev = device;
1502         cqr->memdev = device;
1503         cqr->block = NULL;
1504         cqr->retries = 256;
1505         cqr->expires = 10*HZ;
1506         cqr->buildclk = get_tod_clock();
1507         cqr->status = DASD_CQR_FILLED;
1508         return cqr;
1509 }
1510
1511 /*
1512  * Perform Subsystem Function.
1513  * It is necessary to trigger CIO for channel revalidation since this
1514  * call might change behaviour of DASD devices.
1515  */
1516 static int
1517 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1518                   unsigned long flags)
1519 {
1520         struct dasd_ccw_req *cqr;
1521         int rc;
1522
1523         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1524         if (IS_ERR(cqr))
1525                 return PTR_ERR(cqr);
1526
1527         /*
1528          * set flags e.g. turn on failfast, to prevent blocking
1529          * the calling function should handle failed requests
1530          */
1531         cqr->flags |= flags;
1532
1533         rc = dasd_sleep_on(cqr);
1534         if (!rc)
1535                 /* trigger CIO to reprobe devices */
1536                 css_schedule_reprobe();
1537         else if (cqr->intrc == -EAGAIN)
1538                 rc = -EAGAIN;
1539
1540         dasd_sfree_request(cqr, cqr->memdev);
1541         return rc;
1542 }
1543
1544 /*
1545  * Valide storage server of current device.
1546  */
1547 static int dasd_eckd_validate_server(struct dasd_device *device,
1548                                      unsigned long flags)
1549 {
1550         int rc;
1551         struct dasd_eckd_private *private;
1552         int enable_pav;
1553
1554         private = (struct dasd_eckd_private *) device->private;
1555         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1556             private->uid.type == UA_HYPER_PAV_ALIAS)
1557                 return 0;
1558         if (dasd_nopav || MACHINE_IS_VM)
1559                 enable_pav = 0;
1560         else
1561                 enable_pav = 1;
1562         rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1563
1564         /* may be requested feature is not available on server,
1565          * therefore just report error and go ahead */
1566         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1567                         "returned rc=%d", private->uid.ssid, rc);
1568         return rc;
1569 }
1570
1571 /*
1572  * worker to do a validate server in case of a lost pathgroup
1573  */
1574 static void dasd_eckd_do_validate_server(struct work_struct *work)
1575 {
1576         struct dasd_device *device = container_of(work, struct dasd_device,
1577                                                   kick_validate);
1578         unsigned long flags = 0;
1579
1580         set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1581         if (dasd_eckd_validate_server(device, flags)
1582             == -EAGAIN) {
1583                 /* schedule worker again if failed */
1584                 schedule_work(&device->kick_validate);
1585                 return;
1586         }
1587
1588         dasd_put_device(device);
1589 }
1590
1591 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1592 {
1593         dasd_get_device(device);
1594         /* exit if device not online or in offline processing */
1595         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1596            device->state < DASD_STATE_ONLINE) {
1597                 dasd_put_device(device);
1598                 return;
1599         }
1600         /* queue call to do_validate_server to the kernel event daemon. */
1601         schedule_work(&device->kick_validate);
1602 }
1603
1604 static u32 get_fcx_max_data(struct dasd_device *device)
1605 {
1606 #if defined(CONFIG_64BIT)
1607         int tpm, mdc;
1608         int fcx_in_css, fcx_in_gneq, fcx_in_features;
1609         struct dasd_eckd_private *private;
1610
1611         if (dasd_nofcx)
1612                 return 0;
1613         /* is transport mode supported? */
1614         private = (struct dasd_eckd_private *) device->private;
1615         fcx_in_css = css_general_characteristics.fcx;
1616         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1617         fcx_in_features = private->features.feature[40] & 0x80;
1618         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1619
1620         if (!tpm)
1621                 return 0;
1622
1623         mdc = ccw_device_get_mdc(device->cdev, 0);
1624         if (mdc < 0) {
1625                 dev_warn(&device->cdev->dev, "Detecting the maximum supported"
1626                          " data size for zHPF requests failed\n");
1627                 return 0;
1628         } else
1629                 return mdc * FCX_MAX_DATA_FACTOR;
1630 #else
1631         return 0;
1632 #endif
1633 }
1634
1635 /*
1636  * Check device characteristics.
1637  * If the device is accessible using ECKD discipline, the device is enabled.
1638  */
1639 static int
1640 dasd_eckd_check_characteristics(struct dasd_device *device)
1641 {
1642         struct dasd_eckd_private *private;
1643         struct dasd_block *block;
1644         struct dasd_uid temp_uid;
1645         int rc, i;
1646         int readonly;
1647         unsigned long value;
1648
1649         /* setup work queue for validate server*/
1650         INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1651
1652         if (!ccw_device_is_pathgroup(device->cdev)) {
1653                 dev_warn(&device->cdev->dev,
1654                          "A channel path group could not be established\n");
1655                 return -EIO;
1656         }
1657         if (!ccw_device_is_multipath(device->cdev)) {
1658                 dev_info(&device->cdev->dev,
1659                          "The DASD is not operating in multipath mode\n");
1660         }
1661         private = (struct dasd_eckd_private *) device->private;
1662         if (!private) {
1663                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1664                 if (!private) {
1665                         dev_warn(&device->cdev->dev,
1666                                  "Allocating memory for private DASD data "
1667                                  "failed\n");
1668                         return -ENOMEM;
1669                 }
1670                 device->private = (void *) private;
1671         } else {
1672                 memset(private, 0, sizeof(*private));
1673         }
1674         /* Invalidate status of initial analysis. */
1675         private->init_cqr_status = -1;
1676         /* Set default cache operations. */
1677         private->attrib.operation = DASD_NORMAL_CACHE;
1678         private->attrib.nr_cyl = 0;
1679
1680         /* Read Configuration Data */
1681         rc = dasd_eckd_read_conf(device);
1682         if (rc)
1683                 goto out_err1;
1684
1685         /* set default timeout */
1686         device->default_expires = DASD_EXPIRES;
1687         /* set default retry count */
1688         device->default_retries = DASD_RETRIES;
1689
1690         if (private->gneq) {
1691                 value = 1;
1692                 for (i = 0; i < private->gneq->timeout.value; i++)
1693                         value = 10 * value;
1694                 value = value * private->gneq->timeout.number;
1695                 /* do not accept useless values */
1696                 if (value != 0 && value <= DASD_EXPIRES_MAX)
1697                         device->default_expires = value;
1698         }
1699
1700         dasd_eckd_get_uid(device, &temp_uid);
1701         if (temp_uid.type == UA_BASE_DEVICE) {
1702                 block = dasd_alloc_block();
1703                 if (IS_ERR(block)) {
1704                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1705                                         "could not allocate dasd "
1706                                         "block structure");
1707                         rc = PTR_ERR(block);
1708                         goto out_err1;
1709                 }
1710                 device->block = block;
1711                 block->base = device;
1712         }
1713
1714         /* register lcu with alias handling, enable PAV */
1715         rc = dasd_alias_make_device_known_to_lcu(device);
1716         if (rc)
1717                 goto out_err2;
1718
1719         dasd_eckd_validate_server(device, 0);
1720
1721         /* device may report different configuration data after LCU setup */
1722         rc = dasd_eckd_read_conf(device);
1723         if (rc)
1724                 goto out_err3;
1725
1726         /* Read Feature Codes */
1727         dasd_eckd_read_features(device);
1728
1729         /* Read Device Characteristics */
1730         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1731                                          &private->rdc_data, 64);
1732         if (rc) {
1733                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1734                                 "Read device characteristic failed, rc=%d", rc);
1735                 goto out_err3;
1736         }
1737
1738         if ((device->features & DASD_FEATURE_USERAW) &&
1739             !(private->rdc_data.facilities.RT_in_LR)) {
1740                 dev_err(&device->cdev->dev, "The storage server does not "
1741                         "support raw-track access\n");
1742                 rc = -EINVAL;
1743                 goto out_err3;
1744         }
1745
1746         /* find the valid cylinder size */
1747         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1748             private->rdc_data.long_no_cyl)
1749                 private->real_cyl = private->rdc_data.long_no_cyl;
1750         else
1751                 private->real_cyl = private->rdc_data.no_cyl;
1752
1753         private->fcx_max_data = get_fcx_max_data(device);
1754
1755         readonly = dasd_device_is_ro(device);
1756         if (readonly)
1757                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1758
1759         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1760                  "with %d cylinders, %d heads, %d sectors%s\n",
1761                  private->rdc_data.dev_type,
1762                  private->rdc_data.dev_model,
1763                  private->rdc_data.cu_type,
1764                  private->rdc_data.cu_model.model,
1765                  private->real_cyl,
1766                  private->rdc_data.trk_per_cyl,
1767                  private->rdc_data.sec_per_trk,
1768                  readonly ? ", read-only device" : "");
1769         return 0;
1770
1771 out_err3:
1772         dasd_alias_disconnect_device_from_lcu(device);
1773 out_err2:
1774         dasd_free_block(device->block);
1775         device->block = NULL;
1776 out_err1:
1777         kfree(private->conf_data);
1778         kfree(device->private);
1779         device->private = NULL;
1780         return rc;
1781 }
1782
1783 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1784 {
1785         struct dasd_eckd_private *private;
1786
1787         private = (struct dasd_eckd_private *) device->private;
1788         dasd_alias_disconnect_device_from_lcu(device);
1789         private->ned = NULL;
1790         private->sneq = NULL;
1791         private->vdsneq = NULL;
1792         private->gneq = NULL;
1793         private->conf_len = 0;
1794         kfree(private->conf_data);
1795         private->conf_data = NULL;
1796 }
1797
1798 static struct dasd_ccw_req *
1799 dasd_eckd_analysis_ccw(struct dasd_device *device)
1800 {
1801         struct dasd_eckd_private *private;
1802         struct eckd_count *count_data;
1803         struct LO_eckd_data *LO_data;
1804         struct dasd_ccw_req *cqr;
1805         struct ccw1 *ccw;
1806         int cplength, datasize;
1807         int i;
1808
1809         private = (struct dasd_eckd_private *) device->private;
1810
1811         cplength = 8;
1812         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1813         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1814         if (IS_ERR(cqr))
1815                 return cqr;
1816         ccw = cqr->cpaddr;
1817         /* Define extent for the first 3 tracks. */
1818         define_extent(ccw++, cqr->data, 0, 2,
1819                       DASD_ECKD_CCW_READ_COUNT, device);
1820         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1821         /* Locate record for the first 4 records on track 0. */
1822         ccw[-1].flags |= CCW_FLAG_CC;
1823         locate_record(ccw++, LO_data++, 0, 0, 4,
1824                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1825
1826         count_data = private->count_area;
1827         for (i = 0; i < 4; i++) {
1828                 ccw[-1].flags |= CCW_FLAG_CC;
1829                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1830                 ccw->flags = 0;
1831                 ccw->count = 8;
1832                 ccw->cda = (__u32)(addr_t) count_data;
1833                 ccw++;
1834                 count_data++;
1835         }
1836
1837         /* Locate record for the first record on track 2. */
1838         ccw[-1].flags |= CCW_FLAG_CC;
1839         locate_record(ccw++, LO_data++, 2, 0, 1,
1840                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1841         /* Read count ccw. */
1842         ccw[-1].flags |= CCW_FLAG_CC;
1843         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1844         ccw->flags = 0;
1845         ccw->count = 8;
1846         ccw->cda = (__u32)(addr_t) count_data;
1847
1848         cqr->block = NULL;
1849         cqr->startdev = device;
1850         cqr->memdev = device;
1851         cqr->retries = 255;
1852         cqr->buildclk = get_tod_clock();
1853         cqr->status = DASD_CQR_FILLED;
1854         return cqr;
1855 }
1856
1857 /* differentiate between 'no record found' and any other error */
1858 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1859 {
1860         char *sense;
1861         if (init_cqr->status == DASD_CQR_DONE)
1862                 return INIT_CQR_OK;
1863         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1864                  init_cqr->status == DASD_CQR_FAILED) {
1865                 sense = dasd_get_sense(&init_cqr->irb);
1866                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1867                         return INIT_CQR_UNFORMATTED;
1868                 else
1869                         return INIT_CQR_ERROR;
1870         } else
1871                 return INIT_CQR_ERROR;
1872 }
1873
1874 /*
1875  * This is the callback function for the init_analysis cqr. It saves
1876  * the status of the initial analysis ccw before it frees it and kicks
1877  * the device to continue the startup sequence. This will call
1878  * dasd_eckd_do_analysis again (if the devices has not been marked
1879  * for deletion in the meantime).
1880  */
1881 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1882                                         void *data)
1883 {
1884         struct dasd_eckd_private *private;
1885         struct dasd_device *device;
1886
1887         device = init_cqr->startdev;
1888         private = (struct dasd_eckd_private *) device->private;
1889         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1890         dasd_sfree_request(init_cqr, device);
1891         dasd_kick_device(device);
1892 }
1893
1894 static int dasd_eckd_start_analysis(struct dasd_block *block)
1895 {
1896         struct dasd_ccw_req *init_cqr;
1897
1898         init_cqr = dasd_eckd_analysis_ccw(block->base);
1899         if (IS_ERR(init_cqr))
1900                 return PTR_ERR(init_cqr);
1901         init_cqr->callback = dasd_eckd_analysis_callback;
1902         init_cqr->callback_data = NULL;
1903         init_cqr->expires = 5*HZ;
1904         /* first try without ERP, so we can later handle unformatted
1905          * devices as special case
1906          */
1907         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1908         init_cqr->retries = 0;
1909         dasd_add_request_head(init_cqr);
1910         return -EAGAIN;
1911 }
1912
1913 static int dasd_eckd_end_analysis(struct dasd_block *block)
1914 {
1915         struct dasd_device *device;
1916         struct dasd_eckd_private *private;
1917         struct eckd_count *count_area;
1918         unsigned int sb, blk_per_trk;
1919         int status, i;
1920         struct dasd_ccw_req *init_cqr;
1921
1922         device = block->base;
1923         private = (struct dasd_eckd_private *) device->private;
1924         status = private->init_cqr_status;
1925         private->init_cqr_status = -1;
1926         if (status == INIT_CQR_ERROR) {
1927                 /* try again, this time with full ERP */
1928                 init_cqr = dasd_eckd_analysis_ccw(device);
1929                 dasd_sleep_on(init_cqr);
1930                 status = dasd_eckd_analysis_evaluation(init_cqr);
1931                 dasd_sfree_request(init_cqr, device);
1932         }
1933
1934         if (device->features & DASD_FEATURE_USERAW) {
1935                 block->bp_block = DASD_RAW_BLOCKSIZE;
1936                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1937                 block->s2b_shift = 3;
1938                 goto raw;
1939         }
1940
1941         if (status == INIT_CQR_UNFORMATTED) {
1942                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1943                 return -EMEDIUMTYPE;
1944         } else if (status == INIT_CQR_ERROR) {
1945                 dev_err(&device->cdev->dev,
1946                         "Detecting the DASD disk layout failed because "
1947                         "of an I/O error\n");
1948                 return -EIO;
1949         }
1950
1951         private->uses_cdl = 1;
1952         /* Check Track 0 for Compatible Disk Layout */
1953         count_area = NULL;
1954         for (i = 0; i < 3; i++) {
1955                 if (private->count_area[i].kl != 4 ||
1956                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
1957                     private->count_area[i].cyl != 0 ||
1958                     private->count_area[i].head != count_area_head[i] ||
1959                     private->count_area[i].record != count_area_rec[i]) {
1960                         private->uses_cdl = 0;
1961                         break;
1962                 }
1963         }
1964         if (i == 3)
1965                 count_area = &private->count_area[4];
1966
1967         if (private->uses_cdl == 0) {
1968                 for (i = 0; i < 5; i++) {
1969                         if ((private->count_area[i].kl != 0) ||
1970                             (private->count_area[i].dl !=
1971                              private->count_area[0].dl) ||
1972                             private->count_area[i].cyl !=  0 ||
1973                             private->count_area[i].head != count_area_head[i] ||
1974                             private->count_area[i].record != count_area_rec[i])
1975                                 break;
1976                 }
1977                 if (i == 5)
1978                         count_area = &private->count_area[0];
1979         } else {
1980                 if (private->count_area[3].record == 1)
1981                         dev_warn(&device->cdev->dev,
1982                                  "Track 0 has no records following the VTOC\n");
1983         }
1984
1985         if (count_area != NULL && count_area->kl == 0) {
1986                 /* we found notthing violating our disk layout */
1987                 if (dasd_check_blocksize(count_area->dl) == 0)
1988                         block->bp_block = count_area->dl;
1989         }
1990         if (block->bp_block == 0) {
1991                 dev_warn(&device->cdev->dev,
1992                          "The disk layout of the DASD is not supported\n");
1993                 return -EMEDIUMTYPE;
1994         }
1995         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1996         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1997                 block->s2b_shift++;
1998
1999         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2000
2001 raw:
2002         block->blocks = (private->real_cyl *
2003                           private->rdc_data.trk_per_cyl *
2004                           blk_per_trk);
2005
2006         dev_info(&device->cdev->dev,
2007                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
2008                  "%s\n", (block->bp_block >> 10),
2009                  ((private->real_cyl *
2010                    private->rdc_data.trk_per_cyl *
2011                    blk_per_trk * (block->bp_block >> 9)) >> 1),
2012                  ((blk_per_trk * block->bp_block) >> 10),
2013                  private->uses_cdl ?
2014                  "compatible disk layout" : "linux disk layout");
2015
2016         return 0;
2017 }
2018
2019 static int dasd_eckd_do_analysis(struct dasd_block *block)
2020 {
2021         struct dasd_eckd_private *private;
2022
2023         private = (struct dasd_eckd_private *) block->base->private;
2024         if (private->init_cqr_status < 0)
2025                 return dasd_eckd_start_analysis(block);
2026         else
2027                 return dasd_eckd_end_analysis(block);
2028 }
2029
2030 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2031 {
2032         return dasd_alias_add_device(device);
2033 };
2034
2035 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2036 {
2037         cancel_work_sync(&device->reload_device);
2038         cancel_work_sync(&device->kick_validate);
2039         return 0;
2040 };
2041
2042 static int dasd_eckd_ready_to_basic(struct dasd_device *device)
2043 {
2044         return dasd_alias_remove_device(device);
2045 };
2046
2047 static int
2048 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2049 {
2050         struct dasd_eckd_private *private;
2051
2052         private = (struct dasd_eckd_private *) block->base->private;
2053         if (dasd_check_blocksize(block->bp_block) == 0) {
2054                 geo->sectors = recs_per_track(&private->rdc_data,
2055                                               0, block->bp_block);
2056         }
2057         geo->cylinders = private->rdc_data.no_cyl;
2058         geo->heads = private->rdc_data.trk_per_cyl;
2059         return 0;
2060 }
2061
2062 static struct dasd_ccw_req *
2063 dasd_eckd_build_format(struct dasd_device *base,
2064                        struct format_data_t *fdata)
2065 {
2066         struct dasd_eckd_private *base_priv;
2067         struct dasd_eckd_private *start_priv;
2068         struct dasd_device *startdev;
2069         struct dasd_ccw_req *fcp;
2070         struct eckd_count *ect;
2071         struct ch_t address;
2072         struct ccw1 *ccw;
2073         void *data;
2074         int rpt;
2075         int cplength, datasize;
2076         int i, j;
2077         int intensity = 0;
2078         int r0_perm;
2079         int nr_tracks;
2080
2081         startdev = dasd_alias_get_start_dev(base);
2082         if (!startdev)
2083                 startdev = base;
2084
2085         start_priv = (struct dasd_eckd_private *) startdev->private;
2086         base_priv = (struct dasd_eckd_private *) base->private;
2087
2088         rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2089
2090         nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2091
2092         /*
2093          * fdata->intensity is a bit string that tells us what to do:
2094          *   Bit 0: write record zero
2095          *   Bit 1: write home address, currently not supported
2096          *   Bit 2: invalidate tracks
2097          *   Bit 3: use OS/390 compatible disk layout (cdl)
2098          *   Bit 4: do not allow storage subsystem to modify record zero
2099          * Only some bit combinations do make sense.
2100          */
2101         if (fdata->intensity & 0x10) {
2102                 r0_perm = 0;
2103                 intensity = fdata->intensity & ~0x10;
2104         } else {
2105                 r0_perm = 1;
2106                 intensity = fdata->intensity;
2107         }
2108
2109         switch (intensity) {
2110         case 0x00:      /* Normal format */
2111         case 0x08:      /* Normal format, use cdl. */
2112                 cplength = 2 + (rpt*nr_tracks);
2113                 datasize = sizeof(struct PFX_eckd_data) +
2114                         sizeof(struct LO_eckd_data) +
2115                         rpt * nr_tracks * sizeof(struct eckd_count);
2116                 break;
2117         case 0x01:      /* Write record zero and format track. */
2118         case 0x09:      /* Write record zero and format track, use cdl. */
2119                 cplength = 2 + rpt * nr_tracks;
2120                 datasize = sizeof(struct PFX_eckd_data) +
2121                         sizeof(struct LO_eckd_data) +
2122                         sizeof(struct eckd_count) +
2123                         rpt * nr_tracks * sizeof(struct eckd_count);
2124                 break;
2125         case 0x04:      /* Invalidate track. */
2126         case 0x0c:      /* Invalidate track, use cdl. */
2127                 cplength = 3;
2128                 datasize = sizeof(struct PFX_eckd_data) +
2129                         sizeof(struct LO_eckd_data) +
2130                         sizeof(struct eckd_count);
2131                 break;
2132         default:
2133                 dev_warn(&startdev->cdev->dev,
2134                          "An I/O control call used incorrect flags 0x%x\n",
2135                          fdata->intensity);
2136                 return ERR_PTR(-EINVAL);
2137         }
2138         /* Allocate the format ccw request. */
2139         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
2140                                    datasize, startdev);
2141         if (IS_ERR(fcp))
2142                 return fcp;
2143
2144         start_priv->count++;
2145         data = fcp->data;
2146         ccw = fcp->cpaddr;
2147
2148         switch (intensity & ~0x08) {
2149         case 0x00: /* Normal format. */
2150                 prefix(ccw++, (struct PFX_eckd_data *) data,
2151                        fdata->start_unit, fdata->stop_unit,
2152                        DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2153                 /* grant subsystem permission to format R0 */
2154                 if (r0_perm)
2155                         ((struct PFX_eckd_data *)data)
2156                                 ->define_extent.ga_extended |= 0x04;
2157                 data += sizeof(struct PFX_eckd_data);
2158                 ccw[-1].flags |= CCW_FLAG_CC;
2159                 locate_record(ccw++, (struct LO_eckd_data *) data,
2160                               fdata->start_unit, 0, rpt*nr_tracks,
2161                               DASD_ECKD_CCW_WRITE_CKD, base,
2162                               fdata->blksize);
2163                 data += sizeof(struct LO_eckd_data);
2164                 break;
2165         case 0x01: /* Write record zero + format track. */
2166                 prefix(ccw++, (struct PFX_eckd_data *) data,
2167                        fdata->start_unit, fdata->stop_unit,
2168                        DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2169                        base, startdev);
2170                 data += sizeof(struct PFX_eckd_data);
2171                 ccw[-1].flags |= CCW_FLAG_CC;
2172                 locate_record(ccw++, (struct LO_eckd_data *) data,
2173                               fdata->start_unit, 0, rpt * nr_tracks + 1,
2174                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2175                               base->block->bp_block);
2176                 data += sizeof(struct LO_eckd_data);
2177                 break;
2178         case 0x04: /* Invalidate track. */
2179                 prefix(ccw++, (struct PFX_eckd_data *) data,
2180                        fdata->start_unit, fdata->stop_unit,
2181                        DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2182                 data += sizeof(struct PFX_eckd_data);
2183                 ccw[-1].flags |= CCW_FLAG_CC;
2184                 locate_record(ccw++, (struct LO_eckd_data *) data,
2185                               fdata->start_unit, 0, 1,
2186                               DASD_ECKD_CCW_WRITE_CKD, base, 8);
2187                 data += sizeof(struct LO_eckd_data);
2188                 break;
2189         }
2190
2191         for (j = 0; j < nr_tracks; j++) {
2192                 /* calculate cylinder and head for the current track */
2193                 set_ch_t(&address,
2194                          (fdata->start_unit + j) /
2195                          base_priv->rdc_data.trk_per_cyl,
2196                          (fdata->start_unit + j) %
2197                          base_priv->rdc_data.trk_per_cyl);
2198                 if (intensity & 0x01) { /* write record zero */
2199                         ect = (struct eckd_count *) data;
2200                         data += sizeof(struct eckd_count);
2201                         ect->cyl = address.cyl;
2202                         ect->head = address.head;
2203                         ect->record = 0;
2204                         ect->kl = 0;
2205                         ect->dl = 8;
2206                         ccw[-1].flags |= CCW_FLAG_CC;
2207                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2208                         ccw->flags = CCW_FLAG_SLI;
2209                         ccw->count = 8;
2210                         ccw->cda = (__u32)(addr_t) ect;
2211                         ccw++;
2212                 }
2213                 if ((intensity & ~0x08) & 0x04) {       /* erase track */
2214                         ect = (struct eckd_count *) data;
2215                         data += sizeof(struct eckd_count);
2216                         ect->cyl = address.cyl;
2217                         ect->head = address.head;
2218                         ect->record = 1;
2219                         ect->kl = 0;
2220                         ect->dl = 0;
2221                         ccw[-1].flags |= CCW_FLAG_CC;
2222                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2223                         ccw->flags = CCW_FLAG_SLI;
2224                         ccw->count = 8;
2225                         ccw->cda = (__u32)(addr_t) ect;
2226                 } else {                /* write remaining records */
2227                         for (i = 0; i < rpt; i++) {
2228                                 ect = (struct eckd_count *) data;
2229                                 data += sizeof(struct eckd_count);
2230                                 ect->cyl = address.cyl;
2231                                 ect->head = address.head;
2232                                 ect->record = i + 1;
2233                                 ect->kl = 0;
2234                                 ect->dl = fdata->blksize;
2235                                 /*
2236                                  * Check for special tracks 0-1
2237                                  * when formatting CDL
2238                                  */
2239                                 if ((intensity & 0x08) &&
2240                                     fdata->start_unit == 0) {
2241                                         if (i < 3) {
2242                                                 ect->kl = 4;
2243                                                 ect->dl = sizes_trk0[i] - 4;
2244                                         }
2245                                 }
2246                                 if ((intensity & 0x08) &&
2247                                     fdata->start_unit == 1) {
2248                                         ect->kl = 44;
2249                                         ect->dl = LABEL_SIZE - 44;
2250                                 }
2251                                 ccw[-1].flags |= CCW_FLAG_CC;
2252                                 if (i != 0 || j == 0)
2253                                         ccw->cmd_code =
2254                                                 DASD_ECKD_CCW_WRITE_CKD;
2255                                 else
2256                                         ccw->cmd_code =
2257                                                 DASD_ECKD_CCW_WRITE_CKD_MT;
2258                                 ccw->flags = CCW_FLAG_SLI;
2259                                 ccw->count = 8;
2260                                         ccw->cda = (__u32)(addr_t) ect;
2261                                         ccw++;
2262                         }
2263                 }
2264         }
2265
2266         fcp->startdev = startdev;
2267         fcp->memdev = startdev;
2268         fcp->retries = 256;
2269         fcp->expires = startdev->default_expires * HZ;
2270         fcp->buildclk = get_tod_clock();
2271         fcp->status = DASD_CQR_FILLED;
2272
2273         return fcp;
2274 }
2275
2276 static int
2277 dasd_eckd_format_device(struct dasd_device *base,
2278                         struct format_data_t *fdata)
2279 {
2280         struct dasd_ccw_req *cqr, *n;
2281         struct dasd_block *block;
2282         struct dasd_eckd_private *private;
2283         struct list_head format_queue;
2284         struct dasd_device *device;
2285         int old_stop, format_step;
2286         int step, rc = 0;
2287
2288         block = base->block;
2289         private = (struct dasd_eckd_private *) base->private;
2290
2291         /* Sanity checks. */
2292         if (fdata->start_unit >=
2293             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2294                 dev_warn(&base->cdev->dev,
2295                          "Start track number %u used in formatting is too big\n",
2296                          fdata->start_unit);
2297                 return -EINVAL;
2298         }
2299         if (fdata->stop_unit >=
2300             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2301                 dev_warn(&base->cdev->dev,
2302                          "Stop track number %u used in formatting is too big\n",
2303                          fdata->stop_unit);
2304                 return -EINVAL;
2305         }
2306         if (fdata->start_unit > fdata->stop_unit) {
2307                 dev_warn(&base->cdev->dev,
2308                          "Start track %u used in formatting exceeds end track\n",
2309                          fdata->start_unit);
2310                 return -EINVAL;
2311         }
2312         if (dasd_check_blocksize(fdata->blksize) != 0) {
2313                 dev_warn(&base->cdev->dev,
2314                          "The DASD cannot be formatted with block size %u\n",
2315                          fdata->blksize);
2316                 return -EINVAL;
2317         }
2318
2319         INIT_LIST_HEAD(&format_queue);
2320         old_stop = fdata->stop_unit;
2321
2322         while (fdata->start_unit <= 1) {
2323                 fdata->stop_unit = fdata->start_unit;
2324                 cqr = dasd_eckd_build_format(base, fdata);
2325                 list_add(&cqr->blocklist, &format_queue);
2326
2327                 fdata->stop_unit = old_stop;
2328                 fdata->start_unit++;
2329
2330                 if (fdata->start_unit > fdata->stop_unit)
2331                         goto sleep;
2332         }
2333
2334 retry:
2335         format_step = 255 / recs_per_track(&private->rdc_data, 0,
2336                                            fdata->blksize);
2337         while (fdata->start_unit <= old_stop) {
2338                 step = fdata->stop_unit - fdata->start_unit + 1;
2339                 if (step > format_step)
2340                         fdata->stop_unit = fdata->start_unit + format_step - 1;
2341
2342                 cqr = dasd_eckd_build_format(base, fdata);
2343                 if (IS_ERR(cqr)) {
2344                         if (PTR_ERR(cqr) == -ENOMEM) {
2345                                 /*
2346                                  * not enough memory available
2347                                  * go to out and start requests
2348                                  * retry after first requests were finished
2349                                  */
2350                                 fdata->stop_unit = old_stop;
2351                                 goto sleep;
2352                         } else
2353                                 return PTR_ERR(cqr);
2354                 }
2355                 list_add(&cqr->blocklist, &format_queue);
2356
2357                 fdata->start_unit = fdata->stop_unit + 1;
2358                 fdata->stop_unit = old_stop;
2359         }
2360
2361 sleep:
2362         dasd_sleep_on_queue(&format_queue);
2363
2364         list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
2365                 device = cqr->startdev;
2366                 private = (struct dasd_eckd_private *) device->private;
2367                 if (cqr->status == DASD_CQR_FAILED)
2368                         rc = -EIO;
2369                 list_del_init(&cqr->blocklist);
2370                 dasd_sfree_request(cqr, device);
2371                 private->count--;
2372         }
2373
2374         /*
2375          * in case of ENOMEM we need to retry after
2376          * first requests are finished
2377          */
2378         if (fdata->start_unit <= fdata->stop_unit)
2379                 goto retry;
2380
2381         return rc;
2382 }
2383
2384 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2385 {
2386         if (cqr->retries < 0) {
2387                 cqr->status = DASD_CQR_FAILED;
2388                 return;
2389         }
2390         cqr->status = DASD_CQR_FILLED;
2391         if (cqr->block && (cqr->startdev != cqr->block->base)) {
2392                 dasd_eckd_reset_ccw_to_base_io(cqr);
2393                 cqr->startdev = cqr->block->base;
2394                 cqr->lpm = cqr->block->base->path_data.opm;
2395         }
2396 };
2397
2398 static dasd_erp_fn_t
2399 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2400 {
2401         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2402         struct ccw_device *cdev = device->cdev;
2403
2404         switch (cdev->id.cu_type) {
2405         case 0x3990:
2406         case 0x2105:
2407         case 0x2107:
2408         case 0x1750:
2409                 return dasd_3990_erp_action;
2410         case 0x9343:
2411         case 0x3880:
2412         default:
2413                 return dasd_default_erp_action;
2414         }
2415 }
2416
2417 static dasd_erp_fn_t
2418 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2419 {
2420         return dasd_default_erp_postaction;
2421 }
2422
2423 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2424                                               struct dasd_ccw_req *cqr,
2425                                               struct irb *irb)
2426 {
2427         char mask;
2428         char *sense = NULL;
2429         struct dasd_eckd_private *private;
2430
2431         private = (struct dasd_eckd_private *) device->private;
2432         /* first of all check for state change pending interrupt */
2433         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2434         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2435                 /*
2436                  * for alias only, not in offline processing
2437                  * and only if not suspended
2438                  */
2439                 if (!device->block && private->lcu &&
2440                     device->state == DASD_STATE_ONLINE &&
2441                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2442                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2443                         /*
2444                          * the state change could be caused by an alias
2445                          * reassignment remove device from alias handling
2446                          * to prevent new requests from being scheduled on
2447                          * the wrong alias device
2448                          */
2449                         dasd_alias_remove_device(device);
2450
2451                         /* schedule worker to reload device */
2452                         dasd_reload_device(device);
2453                 }
2454                 dasd_generic_handle_state_change(device);
2455                 return;
2456         }
2457
2458         sense = dasd_get_sense(irb);
2459         if (!sense)
2460                 return;
2461
2462         /* summary unit check */
2463         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2464             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2465                 dasd_alias_handle_summary_unit_check(device, irb);
2466                 return;
2467         }
2468
2469         /* service information message SIM */
2470         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
2471             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
2472                 dasd_3990_erp_handle_sim(device, sense);
2473                 return;
2474         }
2475
2476         /* loss of device reservation is handled via base devices only
2477          * as alias devices may be used with several bases
2478          */
2479         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
2480             (sense[7] == 0x3F) &&
2481             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
2482             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
2483                 if (device->features & DASD_FEATURE_FAILONSLCK)
2484                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
2485                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
2486                 dev_err(&device->cdev->dev,
2487                         "The device reservation was lost\n");
2488         }
2489 }
2490
2491 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
2492                                                struct dasd_device *startdev,
2493                                                struct dasd_block *block,
2494                                                struct request *req,
2495                                                sector_t first_rec,
2496                                                sector_t last_rec,
2497                                                sector_t first_trk,
2498                                                sector_t last_trk,
2499                                                unsigned int first_offs,
2500                                                unsigned int last_offs,
2501                                                unsigned int blk_per_trk,
2502                                                unsigned int blksize)
2503 {
2504         struct dasd_eckd_private *private;
2505         unsigned long *idaws;
2506         struct LO_eckd_data *LO_data;
2507         struct dasd_ccw_req *cqr;
2508         struct ccw1 *ccw;
2509         struct req_iterator iter;
2510         struct bio_vec *bv;
2511         char *dst;
2512         unsigned int off;
2513         int count, cidaw, cplength, datasize;
2514         sector_t recid;
2515         unsigned char cmd, rcmd;
2516         int use_prefix;
2517         struct dasd_device *basedev;
2518
2519         basedev = block->base;
2520         private = (struct dasd_eckd_private *) basedev->private;
2521         if (rq_data_dir(req) == READ)
2522                 cmd = DASD_ECKD_CCW_READ_MT;
2523         else if (rq_data_dir(req) == WRITE)
2524                 cmd = DASD_ECKD_CCW_WRITE_MT;
2525         else
2526                 return ERR_PTR(-EINVAL);
2527
2528         /* Check struct bio and count the number of blocks for the request. */
2529         count = 0;
2530         cidaw = 0;
2531         rq_for_each_segment(bv, req, iter) {
2532                 if (bv->bv_len & (blksize - 1))
2533                         /* Eckd can only do full blocks. */
2534                         return ERR_PTR(-EINVAL);
2535                 count += bv->bv_len >> (block->s2b_shift + 9);
2536 #if defined(CONFIG_64BIT)
2537                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
2538                         cidaw += bv->bv_len >> (block->s2b_shift + 9);
2539 #endif
2540         }
2541         /* Paranoia. */
2542         if (count != last_rec - first_rec + 1)
2543                 return ERR_PTR(-EINVAL);
2544
2545         /* use the prefix command if available */
2546         use_prefix = private->features.feature[8] & 0x01;
2547         if (use_prefix) {
2548                 /* 1x prefix + number of blocks */
2549                 cplength = 2 + count;
2550                 /* 1x prefix + cidaws*sizeof(long) */
2551                 datasize = sizeof(struct PFX_eckd_data) +
2552                         sizeof(struct LO_eckd_data) +
2553                         cidaw * sizeof(unsigned long);
2554         } else {
2555                 /* 1x define extent + 1x locate record + number of blocks */
2556                 cplength = 2 + count;
2557                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
2558                 datasize = sizeof(struct DE_eckd_data) +
2559                         sizeof(struct LO_eckd_data) +
2560                         cidaw * sizeof(unsigned long);
2561         }
2562         /* Find out the number of additional locate record ccws for cdl. */
2563         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
2564                 if (last_rec >= 2*blk_per_trk)
2565                         count = 2*blk_per_trk - first_rec;
2566                 cplength += count;
2567                 datasize += count*sizeof(struct LO_eckd_data);
2568         }
2569         /* Allocate the ccw request. */
2570         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2571                                    startdev);
2572         if (IS_ERR(cqr))
2573                 return cqr;
2574         ccw = cqr->cpaddr;
2575         /* First ccw is define extent or prefix. */
2576         if (use_prefix) {
2577                 if (prefix(ccw++, cqr->data, first_trk,
2578                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
2579                         /* Clock not in sync and XRC is enabled.
2580                          * Try again later.
2581                          */
2582                         dasd_sfree_request(cqr, startdev);
2583                         return ERR_PTR(-EAGAIN);
2584                 }
2585                 idaws = (unsigned long *) (cqr->data +
2586                                            sizeof(struct PFX_eckd_data));
2587         } else {
2588                 if (define_extent(ccw++, cqr->data, first_trk,
2589                                   last_trk, cmd, basedev) == -EAGAIN) {
2590                         /* Clock not in sync and XRC is enabled.
2591                          * Try again later.
2592                          */
2593                         dasd_sfree_request(cqr, startdev);
2594                         return ERR_PTR(-EAGAIN);
2595                 }
2596                 idaws = (unsigned long *) (cqr->data +
2597                                            sizeof(struct DE_eckd_data));
2598         }
2599         /* Build locate_record+read/write/ccws. */
2600         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
2601         recid = first_rec;
2602         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
2603                 /* Only standard blocks so there is just one locate record. */
2604                 ccw[-1].flags |= CCW_FLAG_CC;
2605                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
2606                               last_rec - recid + 1, cmd, basedev, blksize);
2607         }
2608         rq_for_each_segment(bv, req, iter) {
2609                 dst = page_address(bv->bv_page) + bv->bv_offset;
2610                 if (dasd_page_cache) {
2611                         char *copy = kmem_cache_alloc(dasd_page_cache,
2612                                                       GFP_DMA | __GFP_NOWARN);
2613                         if (copy && rq_data_dir(req) == WRITE)
2614                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
2615                         if (copy)
2616                                 dst = copy + bv->bv_offset;
2617                 }
2618                 for (off = 0; off < bv->bv_len; off += blksize) {
2619                         sector_t trkid = recid;
2620                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
2621                         rcmd = cmd;
2622                         count = blksize;
2623                         /* Locate record for cdl special block ? */
2624                         if (private->uses_cdl && recid < 2*blk_per_trk) {
2625                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
2626                                         rcmd |= 0x8;
2627                                         count = dasd_eckd_cdl_reclen(recid);
2628                                         if (count < blksize &&
2629                                             rq_data_dir(req) == READ)
2630                                                 memset(dst + count, 0xe5,
2631                                                        blksize - count);
2632                                 }
2633                                 ccw[-1].flags |= CCW_FLAG_CC;
2634                                 locate_record(ccw++, LO_data++,
2635                                               trkid, recoffs + 1,
2636                                               1, rcmd, basedev, count);
2637                         }
2638                         /* Locate record for standard blocks ? */
2639                         if (private->uses_cdl && recid == 2*blk_per_trk) {
2640                                 ccw[-1].flags |= CCW_FLAG_CC;
2641                                 locate_record(ccw++, LO_data++,
2642                                               trkid, recoffs + 1,
2643                                               last_rec - recid + 1,
2644                                               cmd, basedev, count);
2645                         }
2646                         /* Read/write ccw. */
2647                         ccw[-1].flags |= CCW_FLAG_CC;
2648                         ccw->cmd_code = rcmd;
2649                         ccw->count = count;
2650                         if (idal_is_needed(dst, blksize)) {
2651                                 ccw->cda = (__u32)(addr_t) idaws;
2652                                 ccw->flags = CCW_FLAG_IDA;
2653                                 idaws = idal_create_words(idaws, dst, blksize);
2654                         } else {
2655                                 ccw->cda = (__u32)(addr_t) dst;
2656                                 ccw->flags = 0;
2657                         }
2658                         ccw++;
2659                         dst += blksize;
2660                         recid++;
2661                 }
2662         }
2663         if (blk_noretry_request(req) ||
2664             block->base->features & DASD_FEATURE_FAILFAST)
2665                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2666         cqr->startdev = startdev;
2667         cqr->memdev = startdev;
2668         cqr->block = block;
2669         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2670         cqr->lpm = startdev->path_data.ppm;
2671         cqr->retries = startdev->default_retries;
2672         cqr->buildclk = get_tod_clock();
2673         cqr->status = DASD_CQR_FILLED;
2674         return cqr;
2675 }
2676
2677 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
2678                                                struct dasd_device *startdev,
2679                                                struct dasd_block *block,
2680                                                struct request *req,
2681                                                sector_t first_rec,
2682                                                sector_t last_rec,
2683                                                sector_t first_trk,
2684                                                sector_t last_trk,
2685                                                unsigned int first_offs,
2686                                                unsigned int last_offs,
2687                                                unsigned int blk_per_trk,
2688                                                unsigned int blksize)
2689 {
2690         unsigned long *idaws;
2691         struct dasd_ccw_req *cqr;
2692         struct ccw1 *ccw;
2693         struct req_iterator iter;
2694         struct bio_vec *bv;
2695         char *dst, *idaw_dst;
2696         unsigned int cidaw, cplength, datasize;
2697         unsigned int tlf;
2698         sector_t recid;
2699         unsigned char cmd;
2700         struct dasd_device *basedev;
2701         unsigned int trkcount, count, count_to_trk_end;
2702         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
2703         unsigned char new_track, end_idaw;
2704         sector_t trkid;
2705         unsigned int recoffs;
2706
2707         basedev = block->base;
2708         if (rq_data_dir(req) == READ)
2709                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2710         else if (rq_data_dir(req) == WRITE)
2711                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2712         else
2713                 return ERR_PTR(-EINVAL);
2714
2715         /* Track based I/O needs IDAWs for each page, and not just for
2716          * 64 bit addresses. We need additional idals for pages
2717          * that get filled from two tracks, so we use the number
2718          * of records as upper limit.
2719          */
2720         cidaw = last_rec - first_rec + 1;
2721         trkcount = last_trk - first_trk + 1;
2722
2723         /* 1x prefix + one read/write ccw per track */
2724         cplength = 1 + trkcount;
2725
2726         /* on 31-bit we need space for two 32 bit addresses per page
2727          * on 64-bit one 64 bit address
2728          */
2729         datasize = sizeof(struct PFX_eckd_data) +
2730                 cidaw * sizeof(unsigned long long);
2731
2732         /* Allocate the ccw request. */
2733         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2734                                    startdev);
2735         if (IS_ERR(cqr))
2736                 return cqr;
2737         ccw = cqr->cpaddr;
2738         /* transfer length factor: how many bytes to read from the last track */
2739         if (first_trk == last_trk)
2740                 tlf = last_offs - first_offs + 1;
2741         else
2742                 tlf = last_offs + 1;
2743         tlf *= blksize;
2744
2745         if (prefix_LRE(ccw++, cqr->data, first_trk,
2746                        last_trk, cmd, basedev, startdev,
2747                        1 /* format */, first_offs + 1,
2748                        trkcount, blksize,
2749                        tlf) == -EAGAIN) {
2750                 /* Clock not in sync and XRC is enabled.
2751                  * Try again later.
2752                  */
2753                 dasd_sfree_request(cqr, startdev);
2754                 return ERR_PTR(-EAGAIN);
2755         }
2756
2757         /*
2758          * The translation of request into ccw programs must meet the
2759          * following conditions:
2760          * - all idaws but the first and the last must address full pages
2761          *   (or 2K blocks on 31-bit)
2762          * - the scope of a ccw and it's idal ends with the track boundaries
2763          */
2764         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2765         recid = first_rec;
2766         new_track = 1;
2767         end_idaw = 0;
2768         len_to_track_end = 0;
2769         idaw_dst = NULL;
2770         idaw_len = 0;
2771         rq_for_each_segment(bv, req, iter) {
2772                 dst = page_address(bv->bv_page) + bv->bv_offset;
2773                 seg_len = bv->bv_len;
2774                 while (seg_len) {
2775                         if (new_track) {
2776                                 trkid = recid;
2777                                 recoffs = sector_div(trkid, blk_per_trk);
2778                                 count_to_trk_end = blk_per_trk - recoffs;
2779                                 count = min((last_rec - recid + 1),
2780                                             (sector_t)count_to_trk_end);
2781                                 len_to_track_end = count * blksize;
2782                                 ccw[-1].flags |= CCW_FLAG_CC;
2783                                 ccw->cmd_code = cmd;
2784                                 ccw->count = len_to_track_end;
2785                                 ccw->cda = (__u32)(addr_t)idaws;
2786                                 ccw->flags = CCW_FLAG_IDA;
2787                                 ccw++;
2788                                 recid += count;
2789                                 new_track = 0;
2790                                 /* first idaw for a ccw may start anywhere */
2791                                 if (!idaw_dst)
2792                                         idaw_dst = dst;
2793                         }
2794                         /* If we start a new idaw, we must make sure that it
2795                          * starts on an IDA_BLOCK_SIZE boundary.
2796                          * If we continue an idaw, we must make sure that the
2797                          * current segment begins where the so far accumulated
2798                          * idaw ends
2799                          */
2800                         if (!idaw_dst) {
2801                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2802                                         dasd_sfree_request(cqr, startdev);
2803                                         return ERR_PTR(-ERANGE);
2804                                 } else
2805                                         idaw_dst = dst;
2806                         }
2807                         if ((idaw_dst + idaw_len) != dst) {
2808                                 dasd_sfree_request(cqr, startdev);
2809                                 return ERR_PTR(-ERANGE);
2810                         }
2811                         part_len = min(seg_len, len_to_track_end);
2812                         seg_len -= part_len;
2813                         dst += part_len;
2814                         idaw_len += part_len;
2815                         len_to_track_end -= part_len;
2816                         /* collected memory area ends on an IDA_BLOCK border,
2817                          * -> create an idaw
2818                          * idal_create_words will handle cases where idaw_len
2819                          * is larger then IDA_BLOCK_SIZE
2820                          */
2821                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2822                                 end_idaw = 1;
2823                         /* We also need to end the idaw at track end */
2824                         if (!len_to_track_end) {
2825                                 new_track = 1;
2826                                 end_idaw = 1;
2827                         }
2828                         if (end_idaw) {
2829                                 idaws = idal_create_words(idaws, idaw_dst,
2830                                                           idaw_len);
2831                                 idaw_dst = NULL;
2832                                 idaw_len = 0;
2833                                 end_idaw = 0;
2834                         }
2835                 }
2836         }
2837
2838         if (blk_noretry_request(req) ||
2839             block->base->features & DASD_FEATURE_FAILFAST)
2840                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2841         cqr->startdev = startdev;
2842         cqr->memdev = startdev;
2843         cqr->block = block;
2844         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2845         cqr->lpm = startdev->path_data.ppm;
2846         cqr->retries = startdev->default_retries;
2847         cqr->buildclk = get_tod_clock();
2848         cqr->status = DASD_CQR_FILLED;
2849         return cqr;
2850 }
2851
2852 static int prepare_itcw(struct itcw *itcw,
2853                         unsigned int trk, unsigned int totrk, int cmd,
2854                         struct dasd_device *basedev,
2855                         struct dasd_device *startdev,
2856                         unsigned int rec_on_trk, int count,
2857                         unsigned int blksize,
2858                         unsigned int total_data_size,
2859                         unsigned int tlf,
2860                         unsigned int blk_per_trk)
2861 {
2862         struct PFX_eckd_data pfxdata;
2863         struct dasd_eckd_private *basepriv, *startpriv;
2864         struct DE_eckd_data *dedata;
2865         struct LRE_eckd_data *lredata;
2866         struct dcw *dcw;
2867
2868         u32 begcyl, endcyl;
2869         u16 heads, beghead, endhead;
2870         u8 pfx_cmd;
2871
2872         int rc = 0;
2873         int sector = 0;
2874         int dn, d;
2875
2876
2877         /* setup prefix data */
2878         basepriv = (struct dasd_eckd_private *) basedev->private;
2879         startpriv = (struct dasd_eckd_private *) startdev->private;
2880         dedata = &pfxdata.define_extent;
2881         lredata = &pfxdata.locate_record;
2882
2883         memset(&pfxdata, 0, sizeof(pfxdata));
2884         pfxdata.format = 1; /* PFX with LRE */
2885         pfxdata.base_address = basepriv->ned->unit_addr;
2886         pfxdata.base_lss = basepriv->ned->ID;
2887         pfxdata.validity.define_extent = 1;
2888
2889         /* private uid is kept up to date, conf_data may be outdated */
2890         if (startpriv->uid.type != UA_BASE_DEVICE) {
2891                 pfxdata.validity.verify_base = 1;
2892                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2893                         pfxdata.validity.hyper_pav = 1;
2894         }
2895
2896         switch (cmd) {
2897         case DASD_ECKD_CCW_READ_TRACK_DATA:
2898                 dedata->mask.perm = 0x1;
2899                 dedata->attributes.operation = basepriv->attrib.operation;
2900                 dedata->blk_size = blksize;
2901                 dedata->ga_extended |= 0x42;
2902                 lredata->operation.orientation = 0x0;
2903                 lredata->operation.operation = 0x0C;
2904                 lredata->auxiliary.check_bytes = 0x01;
2905                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2906                 break;
2907         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2908                 dedata->mask.perm = 0x02;
2909                 dedata->attributes.operation = basepriv->attrib.operation;
2910                 dedata->blk_size = blksize;
2911                 rc = check_XRC_on_prefix(&pfxdata, basedev);
2912                 dedata->ga_extended |= 0x42;
2913                 lredata->operation.orientation = 0x0;
2914                 lredata->operation.operation = 0x3F;
2915                 lredata->extended_operation = 0x23;
2916                 lredata->auxiliary.check_bytes = 0x2;
2917                 pfx_cmd = DASD_ECKD_CCW_PFX;
2918                 break;
2919         default:
2920                 DBF_DEV_EVENT(DBF_ERR, basedev,
2921                               "prepare itcw, unknown opcode 0x%x", cmd);
2922                 BUG();
2923                 break;
2924         }
2925         if (rc)
2926                 return rc;
2927
2928         dedata->attributes.mode = 0x3;  /* ECKD */
2929
2930         heads = basepriv->rdc_data.trk_per_cyl;
2931         begcyl = trk / heads;
2932         beghead = trk % heads;
2933         endcyl = totrk / heads;
2934         endhead = totrk % heads;
2935
2936         /* check for sequential prestage - enhance cylinder range */
2937         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2938             dedata->attributes.operation == DASD_SEQ_ACCESS) {
2939
2940                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2941                         endcyl += basepriv->attrib.nr_cyl;
2942                 else
2943                         endcyl = (basepriv->real_cyl - 1);
2944         }
2945
2946         set_ch_t(&dedata->beg_ext, begcyl, beghead);
2947         set_ch_t(&dedata->end_ext, endcyl, endhead);
2948
2949         dedata->ep_format = 0x20; /* records per track is valid */
2950         dedata->ep_rec_per_track = blk_per_trk;
2951
2952         if (rec_on_trk) {
2953                 switch (basepriv->rdc_data.dev_type) {
2954                 case 0x3390:
2955                         dn = ceil_quot(blksize + 6, 232);
2956                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
2957                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
2958                         break;
2959                 case 0x3380:
2960                         d = 7 + ceil_quot(blksize + 12, 32);
2961                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
2962                         break;
2963                 }
2964         }
2965
2966         lredata->auxiliary.length_valid = 1;
2967         lredata->auxiliary.length_scope = 1;
2968         lredata->auxiliary.imbedded_ccw_valid = 1;
2969         lredata->length = tlf;
2970         lredata->imbedded_ccw = cmd;
2971         lredata->count = count;
2972         lredata->sector = sector;
2973         set_ch_t(&lredata->seek_addr, begcyl, beghead);
2974         lredata->search_arg.cyl = lredata->seek_addr.cyl;
2975         lredata->search_arg.head = lredata->seek_addr.head;
2976         lredata->search_arg.record = rec_on_trk;
2977
2978         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
2979                      &pfxdata, sizeof(pfxdata), total_data_size);
2980         return PTR_RET(dcw);
2981 }
2982
2983 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
2984                                                struct dasd_device *startdev,
2985                                                struct dasd_block *block,
2986                                                struct request *req,
2987                                                sector_t first_rec,
2988                                                sector_t last_rec,
2989                                                sector_t first_trk,
2990                                                sector_t last_trk,
2991                                                unsigned int first_offs,
2992                                                unsigned int last_offs,
2993                                                unsigned int blk_per_trk,
2994                                                unsigned int blksize)
2995 {
2996         struct dasd_ccw_req *cqr;
2997         struct req_iterator iter;
2998         struct bio_vec *bv;
2999         char *dst;
3000         unsigned int trkcount, ctidaw;
3001         unsigned char cmd;
3002         struct dasd_device *basedev;
3003         unsigned int tlf;
3004         struct itcw *itcw;
3005         struct tidaw *last_tidaw = NULL;
3006         int itcw_op;
3007         size_t itcw_size;
3008         u8 tidaw_flags;
3009         unsigned int seg_len, part_len, len_to_track_end;
3010         unsigned char new_track;
3011         sector_t recid, trkid;
3012         unsigned int offs;
3013         unsigned int count, count_to_trk_end;
3014         int ret;
3015
3016         basedev = block->base;
3017         if (rq_data_dir(req) == READ) {
3018                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3019                 itcw_op = ITCW_OP_READ;
3020         } else if (rq_data_dir(req) == WRITE) {
3021                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3022                 itcw_op = ITCW_OP_WRITE;
3023         } else
3024                 return ERR_PTR(-EINVAL);
3025
3026         /* trackbased I/O needs address all memory via TIDAWs,
3027          * not just for 64 bit addresses. This allows us to map
3028          * each segment directly to one tidaw.
3029          * In the case of write requests, additional tidaws may
3030          * be needed when a segment crosses a track boundary.
3031          */
3032         trkcount = last_trk - first_trk + 1;
3033         ctidaw = 0;
3034         rq_for_each_segment(bv, req, iter) {
3035                 ++ctidaw;
3036         }
3037         if (rq_data_dir(req) == WRITE)
3038                 ctidaw += (last_trk - first_trk);
3039
3040         /* Allocate the ccw request. */
3041         itcw_size = itcw_calc_size(0, ctidaw, 0);
3042         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
3043         if (IS_ERR(cqr))
3044                 return cqr;
3045
3046         /* transfer length factor: how many bytes to read from the last track */
3047         if (first_trk == last_trk)
3048                 tlf = last_offs - first_offs + 1;
3049         else
3050                 tlf = last_offs + 1;
3051         tlf *= blksize;
3052
3053         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
3054         if (IS_ERR(itcw)) {
3055                 ret = -EINVAL;
3056                 goto out_error;
3057         }
3058         cqr->cpaddr = itcw_get_tcw(itcw);
3059         if (prepare_itcw(itcw, first_trk, last_trk,
3060                          cmd, basedev, startdev,
3061                          first_offs + 1,
3062                          trkcount, blksize,
3063                          (last_rec - first_rec + 1) * blksize,
3064                          tlf, blk_per_trk) == -EAGAIN) {
3065                 /* Clock not in sync and XRC is enabled.
3066                  * Try again later.
3067                  */
3068                 ret = -EAGAIN;
3069                 goto out_error;
3070         }
3071         len_to_track_end = 0;
3072         /*
3073          * A tidaw can address 4k of memory, but must not cross page boundaries
3074          * We can let the block layer handle this by setting
3075          * blk_queue_segment_boundary to page boundaries and
3076          * blk_max_segment_size to page size when setting up the request queue.
3077          * For write requests, a TIDAW must not cross track boundaries, because
3078          * we have to set the CBC flag on the last tidaw for each track.
3079          */
3080         if (rq_data_dir(req) == WRITE) {
3081                 new_track = 1;
3082                 recid = first_rec;
3083                 rq_for_each_segment(bv, req, iter) {
3084                         dst = page_address(bv->bv_page) + bv->bv_offset;
3085                         seg_len = bv->bv_len;
3086                         while (seg_len) {
3087                                 if (new_track) {
3088                                         trkid = recid;
3089                                         offs = sector_div(trkid, blk_per_trk);
3090                                         count_to_trk_end = blk_per_trk - offs;
3091                                         count = min((last_rec - recid + 1),
3092                                                     (sector_t)count_to_trk_end);
3093                                         len_to_track_end = count * blksize;
3094                                         recid += count;
3095                                         new_track = 0;
3096                                 }
3097                                 part_len = min(seg_len, len_to_track_end);
3098                                 seg_len -= part_len;
3099                                 len_to_track_end -= part_len;
3100                                 /* We need to end the tidaw at track end */
3101                                 if (!len_to_track_end) {
3102                                         new_track = 1;
3103                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
3104                                 } else
3105                                         tidaw_flags = 0;
3106                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
3107                                                             dst, part_len);
3108                                 if (IS_ERR(last_tidaw)) {
3109                                         ret = -EINVAL;
3110                                         goto out_error;
3111                                 }
3112                                 dst += part_len;
3113                         }
3114                 }
3115         } else {
3116                 rq_for_each_segment(bv, req, iter) {
3117                         dst = page_address(bv->bv_page) + bv->bv_offset;
3118                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
3119                                                     dst, bv->bv_len);
3120                         if (IS_ERR(last_tidaw)) {
3121                                 ret = -EINVAL;
3122                                 goto out_error;
3123                         }
3124                 }
3125         }
3126         last_tidaw->flags |= TIDAW_FLAGS_LAST;
3127         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
3128         itcw_finalize(itcw);
3129
3130         if (blk_noretry_request(req) ||
3131             block->base->features & DASD_FEATURE_FAILFAST)
3132                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3133         cqr->cpmode = 1;
3134         cqr->startdev = startdev;
3135         cqr->memdev = startdev;
3136         cqr->block = block;
3137         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3138         cqr->lpm = startdev->path_data.ppm;
3139         cqr->retries = startdev->default_retries;
3140         cqr->buildclk = get_tod_clock();
3141         cqr->status = DASD_CQR_FILLED;
3142         return cqr;
3143 out_error:
3144         dasd_sfree_request(cqr, startdev);
3145         return ERR_PTR(ret);
3146 }
3147
3148 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3149                                                struct dasd_block *block,
3150                                                struct request *req)
3151 {
3152         int cmdrtd, cmdwtd;
3153         int use_prefix;
3154         int fcx_multitrack;
3155         struct dasd_eckd_private *private;
3156         struct dasd_device *basedev;
3157         sector_t first_rec, last_rec;
3158         sector_t first_trk, last_trk;
3159         unsigned int first_offs, last_offs;
3160         unsigned int blk_per_trk, blksize;
3161         int cdlspecial;
3162         unsigned int data_size;
3163         struct dasd_ccw_req *cqr;
3164
3165         basedev = block->base;
3166         private = (struct dasd_eckd_private *) basedev->private;
3167
3168         /* Calculate number of blocks/records per track. */
3169         blksize = block->bp_block;
3170         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3171         if (blk_per_trk == 0)
3172                 return ERR_PTR(-EINVAL);
3173         /* Calculate record id of first and last block. */
3174         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3175         first_offs = sector_div(first_trk, blk_per_trk);
3176         last_rec = last_trk =
3177                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3178         last_offs = sector_div(last_trk, blk_per_trk);
3179         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3180
3181         fcx_multitrack = private->features.feature[40] & 0x20;
3182         data_size = blk_rq_bytes(req);
3183         /* tpm write request add CBC data on each track boundary */
3184         if (rq_data_dir(req) == WRITE)
3185                 data_size += (last_trk - first_trk) * 4;
3186
3187         /* is read track data and write track data in command mode supported? */
3188         cmdrtd = private->features.feature[9] & 0x20;
3189         cmdwtd = private->features.feature[12] & 0x40;
3190         use_prefix = private->features.feature[8] & 0x01;
3191
3192         cqr = NULL;
3193         if (cdlspecial || dasd_page_cache) {
3194                 /* do nothing, just fall through to the cmd mode single case */
3195         } else if ((data_size <= private->fcx_max_data)
3196                    && (fcx_multitrack || (first_trk == last_trk))) {
3197                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3198                                                     first_rec, last_rec,
3199                                                     first_trk, last_trk,
3200                                                     first_offs, last_offs,
3201                                                     blk_per_trk, blksize);
3202                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3203                     (PTR_ERR(cqr) != -ENOMEM))
3204                         cqr = NULL;
3205         } else if (use_prefix &&
3206                    (((rq_data_dir(req) == READ) && cmdrtd) ||
3207                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3208                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3209                                                    first_rec, last_rec,
3210                                                    first_trk, last_trk,
3211                                                    first_offs, last_offs,
3212                                                    blk_per_trk, blksize);
3213                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3214                     (PTR_ERR(cqr) != -ENOMEM))
3215                         cqr = NULL;
3216         }
3217         if (!cqr)
3218                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3219                                                     first_rec, last_rec,
3220                                                     first_trk, last_trk,
3221                                                     first_offs, last_offs,
3222                                                     blk_per_trk, blksize);
3223         return cqr;
3224 }
3225
3226 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
3227                                                struct dasd_block *block,
3228                                                struct request *req)
3229 {
3230         unsigned long *idaws;
3231         struct dasd_device *basedev;
3232         struct dasd_ccw_req *cqr;
3233         struct ccw1 *ccw;
3234         struct req_iterator iter;
3235         struct bio_vec *bv;
3236         char *dst;
3237         unsigned char cmd;
3238         unsigned int trkcount;
3239         unsigned int seg_len, len_to_track_end;
3240         unsigned int first_offs;
3241         unsigned int cidaw, cplength, datasize;
3242         sector_t first_trk, last_trk, sectors;
3243         sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
3244         unsigned int pfx_datasize;
3245
3246         /*
3247          * raw track access needs to be mutiple of 64k and on 64k boundary
3248          * For read requests we can fix an incorrect alignment by padding
3249          * the request with dummy pages.
3250          */
3251         start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
3252         end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
3253                 DASD_RAW_SECTORS_PER_TRACK;
3254         end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
3255                 DASD_RAW_SECTORS_PER_TRACK;
3256         basedev = block->base;
3257         if ((start_padding_sectors || end_padding_sectors) &&
3258             (rq_data_dir(req) == WRITE)) {
3259                 DBF_DEV_EVENT(DBF_ERR, basedev,
3260                               "raw write not track aligned (%lu,%lu) req %p",
3261                               start_padding_sectors, end_padding_sectors, req);
3262                 cqr = ERR_PTR(-EINVAL);
3263                 goto out;
3264         }
3265
3266         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3267         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3268                 DASD_RAW_SECTORS_PER_TRACK;
3269         trkcount = last_trk - first_trk + 1;
3270         first_offs = 0;
3271
3272         if (rq_data_dir(req) == READ)
3273                 cmd = DASD_ECKD_CCW_READ_TRACK;
3274         else if (rq_data_dir(req) == WRITE)
3275                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3276         else {
3277                 cqr = ERR_PTR(-EINVAL);
3278                 goto out;
3279         }
3280
3281         /*
3282          * Raw track based I/O needs IDAWs for each page,
3283          * and not just for 64 bit addresses.
3284          */
3285         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3286
3287         /* 1x prefix + one read/write ccw per track */
3288         cplength = 1 + trkcount;
3289
3290         /*
3291          * struct PFX_eckd_data has up to 2 byte as extended parameter
3292          * this is needed for write full track and has to be mentioned
3293          * separately
3294          * add 8 instead of 2 to keep 8 byte boundary
3295          */
3296         pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
3297
3298         datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
3299
3300         /* Allocate the ccw request. */
3301         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3302                                    datasize, startdev);
3303         if (IS_ERR(cqr))
3304                 goto out;
3305         ccw = cqr->cpaddr;
3306
3307         if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
3308                        basedev, startdev, 1 /* format */, first_offs + 1,
3309                        trkcount, 0, 0) == -EAGAIN) {
3310                 /* Clock not in sync and XRC is enabled.
3311                  * Try again later.
3312                  */
3313                 dasd_sfree_request(cqr, startdev);
3314                 cqr = ERR_PTR(-EAGAIN);
3315                 goto out;
3316         }
3317
3318         idaws = (unsigned long *)(cqr->data + pfx_datasize);
3319         len_to_track_end = 0;
3320         if (start_padding_sectors) {
3321                 ccw[-1].flags |= CCW_FLAG_CC;
3322                 ccw->cmd_code = cmd;
3323                 /* maximum 3390 track size */
3324                 ccw->count = 57326;
3325                 /* 64k map to one track */
3326                 len_to_track_end = 65536 - start_padding_sectors * 512;
3327                 ccw->cda = (__u32)(addr_t)idaws;
3328                 ccw->flags |= CCW_FLAG_IDA;
3329                 ccw->flags |= CCW_FLAG_SLI;
3330                 ccw++;
3331                 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
3332                         idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3333         }
3334         rq_for_each_segment(bv, req, iter) {
3335                 dst = page_address(bv->bv_page) + bv->bv_offset;
3336                 seg_len = bv->bv_len;
3337                 if (cmd == DASD_ECKD_CCW_READ_TRACK)
3338                         memset(dst, 0, seg_len);
3339                 if (!len_to_track_end) {
3340                         ccw[-1].flags |= CCW_FLAG_CC;
3341                         ccw->cmd_code = cmd;
3342                         /* maximum 3390 track size */
3343                         ccw->count = 57326;
3344                         /* 64k map to one track */
3345                         len_to_track_end = 65536;
3346                         ccw->cda = (__u32)(addr_t)idaws;
3347                         ccw->flags |= CCW_FLAG_IDA;
3348                         ccw->flags |= CCW_FLAG_SLI;
3349                         ccw++;
3350                 }
3351                 len_to_track_end -= seg_len;
3352                 idaws = idal_create_words(idaws, dst, seg_len);
3353         }
3354         for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
3355                 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3356         if (blk_noretry_request(req) ||
3357             block->base->features & DASD_FEATURE_FAILFAST)
3358                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3359         cqr->startdev = startdev;
3360         cqr->memdev = startdev;
3361         cqr->block = block;
3362         cqr->expires = startdev->default_expires * HZ;
3363         cqr->lpm = startdev->path_data.ppm;
3364         cqr->retries = startdev->default_retries;
3365         cqr->buildclk = get_tod_clock();
3366         cqr->status = DASD_CQR_FILLED;
3367
3368         if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
3369                 cqr = NULL;
3370 out:
3371         return cqr;
3372 }
3373
3374
3375 static int
3376 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3377 {
3378         struct dasd_eckd_private *private;
3379         struct ccw1 *ccw;
3380         struct req_iterator iter;
3381         struct bio_vec *bv;
3382         char *dst, *cda;
3383         unsigned int blksize, blk_per_trk, off;
3384         sector_t recid;
3385         int status;
3386
3387         if (!dasd_page_cache)
3388                 goto out;
3389         private = (struct dasd_eckd_private *) cqr->block->base->private;
3390         blksize = cqr->block->bp_block;
3391         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3392         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3393         ccw = cqr->cpaddr;
3394         /* Skip over define extent & locate record. */
3395         ccw++;
3396         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3397                 ccw++;
3398         rq_for_each_segment(bv, req, iter) {
3399                 dst = page_address(bv->bv_page) + bv->bv_offset;
3400                 for (off = 0; off < bv->bv_len; off += blksize) {
3401                         /* Skip locate record. */
3402                         if (private->uses_cdl && recid <= 2*blk_per_trk)
3403                                 ccw++;
3404                         if (dst) {
3405                                 if (ccw->flags & CCW_FLAG_IDA)
3406                                         cda = *((char **)((addr_t) ccw->cda));
3407                                 else
3408                                         cda = (char *)((addr_t) ccw->cda);
3409                                 if (dst != cda) {
3410                                         if (rq_data_dir(req) == READ)
3411                                                 memcpy(dst, cda, bv->bv_len);
3412                                         kmem_cache_free(dasd_page_cache,
3413                                             (void *)((addr_t)cda & PAGE_MASK));
3414                                 }
3415                                 dst = NULL;
3416                         }
3417                         ccw++;
3418                         recid++;
3419                 }
3420         }
3421 out:
3422         status = cqr->status == DASD_CQR_DONE;
3423         dasd_sfree_request(cqr, cqr->memdev);
3424         return status;
3425 }
3426
3427 /*
3428  * Modify ccw/tcw in cqr so it can be started on a base device.
3429  *
3430  * Note that this is not enough to restart the cqr!
3431  * Either reset cqr->startdev as well (summary unit check handling)
3432  * or restart via separate cqr (as in ERP handling).
3433  */
3434 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3435 {
3436         struct ccw1 *ccw;
3437         struct PFX_eckd_data *pfxdata;
3438         struct tcw *tcw;
3439         struct tccb *tccb;
3440         struct dcw *dcw;
3441
3442         if (cqr->cpmode == 1) {
3443                 tcw = cqr->cpaddr;
3444                 tccb = tcw_get_tccb(tcw);
3445                 dcw = (struct dcw *)&tccb->tca[0];
3446                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
3447                 pfxdata->validity.verify_base = 0;
3448                 pfxdata->validity.hyper_pav = 0;
3449         } else {
3450                 ccw = cqr->cpaddr;
3451                 pfxdata = cqr->data;
3452                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
3453                         pfxdata->validity.verify_base = 0;
3454                         pfxdata->validity.hyper_pav = 0;
3455                 }
3456         }
3457 }
3458
3459 #define DASD_ECKD_CHANQ_MAX_SIZE 4
3460
3461 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
3462                                                      struct dasd_block *block,
3463                                                      struct request *req)
3464 {
3465         struct dasd_eckd_private *private;
3466         struct dasd_device *startdev;
3467         unsigned long flags;
3468         struct dasd_ccw_req *cqr;
3469
3470         startdev = dasd_alias_get_start_dev(base);
3471         if (!startdev)
3472                 startdev = base;
3473         private = (struct dasd_eckd_private *) startdev->private;
3474         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
3475                 return ERR_PTR(-EBUSY);
3476
3477         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
3478         private->count++;
3479         if ((base->features & DASD_FEATURE_USERAW))
3480                 cqr = dasd_raw_build_cp(startdev, block, req);
3481         else
3482                 cqr = dasd_eckd_build_cp(startdev, block, req);
3483         if (IS_ERR(cqr))
3484                 private->count--;
3485         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
3486         return cqr;
3487 }
3488
3489 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
3490                                    struct request *req)
3491 {
3492         struct dasd_eckd_private *private;
3493         unsigned long flags;
3494
3495         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
3496         private = (struct dasd_eckd_private *) cqr->memdev->private;
3497         private->count--;
3498         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
3499         return dasd_eckd_free_cp(cqr, req);
3500 }
3501
3502 static int
3503 dasd_eckd_fill_info(struct dasd_device * device,
3504                     struct dasd_information2_t * info)
3505 {
3506         struct dasd_eckd_private *private;
3507
3508         private = (struct dasd_eckd_private *) device->private;
3509         info->label_block = 2;
3510         info->FBA_layout = private->uses_cdl ? 0 : 1;
3511         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
3512         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
3513         memcpy(info->characteristics, &private->rdc_data,
3514                sizeof(struct dasd_eckd_characteristics));
3515         info->confdata_size = min((unsigned long)private->conf_len,
3516                                   sizeof(info->configuration_data));
3517         memcpy(info->configuration_data, private->conf_data,
3518                info->confdata_size);
3519         return 0;
3520 }
3521
3522 /*
3523  * SECTION: ioctl functions for eckd devices.
3524  */
3525
3526 /*
3527  * Release device ioctl.
3528  * Buils a channel programm to releases a prior reserved
3529  * (see dasd_eckd_reserve) device.
3530  */
3531 static int
3532 dasd_eckd_release(struct dasd_device *device)
3533 {
3534         struct dasd_ccw_req *cqr;
3535         int rc;
3536         struct ccw1 *ccw;
3537         int useglobal;
3538
3539         if (!capable(CAP_SYS_ADMIN))
3540                 return -EACCES;
3541
3542         useglobal = 0;
3543         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3544         if (IS_ERR(cqr)) {
3545                 mutex_lock(&dasd_reserve_mutex);
3546                 useglobal = 1;
3547                 cqr = &dasd_reserve_req->cqr;
3548                 memset(cqr, 0, sizeof(*cqr));
3549                 memset(&dasd_reserve_req->ccw, 0,
3550                        sizeof(dasd_reserve_req->ccw));
3551                 cqr->cpaddr = &dasd_reserve_req->ccw;
3552                 cqr->data = &dasd_reserve_req->data;
3553                 cqr->magic = DASD_ECKD_MAGIC;
3554         }
3555         ccw = cqr->cpaddr;
3556         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
3557         ccw->flags |= CCW_FLAG_SLI;
3558         ccw->count = 32;
3559         ccw->cda = (__u32)(addr_t) cqr->data;
3560         cqr->startdev = device;
3561         cqr->memdev = device;
3562         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3563         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3564         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3565         cqr->expires = 2 * HZ;
3566         cqr->buildclk = get_tod_clock();
3567         cqr->status = DASD_CQR_FILLED;
3568
3569         rc = dasd_sleep_on_immediatly(cqr);
3570         if (!rc)
3571                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3572
3573         if (useglobal)
3574                 mutex_unlock(&dasd_reserve_mutex);
3575         else
3576                 dasd_sfree_request(cqr, cqr->memdev);
3577         return rc;
3578 }
3579
3580 /*
3581  * Reserve device ioctl.
3582  * Options are set to 'synchronous wait for interrupt' and
3583  * 'timeout the request'. This leads to a terminate IO if
3584  * the interrupt is outstanding for a certain time.
3585  */
3586 static int
3587 dasd_eckd_reserve(struct dasd_device *device)
3588 {
3589         struct dasd_ccw_req *cqr;
3590         int rc;
3591         struct ccw1 *ccw;
3592         int useglobal;
3593
3594         if (!capable(CAP_SYS_ADMIN))
3595                 return -EACCES;
3596
3597         useglobal = 0;
3598         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3599         if (IS_ERR(cqr)) {
3600                 mutex_lock(&dasd_reserve_mutex);
3601                 useglobal = 1;
3602                 cqr = &dasd_reserve_req->cqr;
3603                 memset(cqr, 0, sizeof(*cqr));
3604                 memset(&dasd_reserve_req->ccw, 0,
3605                        sizeof(dasd_reserve_req->ccw));
3606                 cqr->cpaddr = &dasd_reserve_req->ccw;
3607                 cqr->data = &dasd_reserve_req->data;
3608                 cqr->magic = DASD_ECKD_MAGIC;
3609         }
3610         ccw = cqr->cpaddr;
3611         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
3612         ccw->flags |= CCW_FLAG_SLI;
3613         ccw->count = 32;
3614         ccw->cda = (__u32)(addr_t) cqr->data;
3615         cqr->startdev = device;
3616         cqr->memdev = device;
3617         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3618         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3619         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3620         cqr->expires = 2 * HZ;
3621         cqr->buildclk = get_tod_clock();
3622         cqr->status = DASD_CQR_FILLED;
3623
3624         rc = dasd_sleep_on_immediatly(cqr);
3625         if (!rc)
3626                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3627
3628         if (useglobal)
3629                 mutex_unlock(&dasd_reserve_mutex);
3630         else
3631                 dasd_sfree_request(cqr, cqr->memdev);
3632         return rc;
3633 }
3634
3635 /*
3636  * Steal lock ioctl - unconditional reserve device.
3637  * Buils a channel programm to break a device's reservation.
3638  * (unconditional reserve)
3639  */
3640 static int
3641 dasd_eckd_steal_lock(struct dasd_device *device)
3642 {
3643         struct dasd_ccw_req *cqr;
3644         int rc;
3645         struct ccw1 *ccw;
3646         int useglobal;
3647
3648         if (!capable(CAP_SYS_ADMIN))
3649                 return -EACCES;
3650
3651         useglobal = 0;
3652         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3653         if (IS_ERR(cqr)) {
3654                 mutex_lock(&dasd_reserve_mutex);
3655                 useglobal = 1;
3656                 cqr = &dasd_reserve_req->cqr;
3657                 memset(cqr, 0, sizeof(*cqr));
3658                 memset(&dasd_reserve_req->ccw, 0,
3659                        sizeof(dasd_reserve_req->ccw));
3660                 cqr->cpaddr = &dasd_reserve_req->ccw;
3661                 cqr->data = &dasd_reserve_req->data;
3662                 cqr->magic = DASD_ECKD_MAGIC;
3663         }
3664         ccw = cqr->cpaddr;
3665         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
3666         ccw->flags |= CCW_FLAG_SLI;
3667         ccw->count = 32;
3668         ccw->cda = (__u32)(addr_t) cqr->data;
3669         cqr->startdev = device;
3670         cqr->memdev = device;
3671         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3672         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3673         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3674         cqr->expires = 2 * HZ;
3675         cqr->buildclk = get_tod_clock();
3676         cqr->status = DASD_CQR_FILLED;
3677
3678         rc = dasd_sleep_on_immediatly(cqr);
3679         if (!rc)
3680                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3681
3682         if (useglobal)
3683                 mutex_unlock(&dasd_reserve_mutex);
3684         else
3685                 dasd_sfree_request(cqr, cqr->memdev);
3686         return rc;
3687 }
3688
3689 /*
3690  * SNID - Sense Path Group ID
3691  * This ioctl may be used in situations where I/O is stalled due to
3692  * a reserve, so if the normal dasd_smalloc_request fails, we use the
3693  * preallocated dasd_reserve_req.
3694  */
3695 static int dasd_eckd_snid(struct dasd_device *device,
3696                           void __user *argp)
3697 {
3698         struct dasd_ccw_req *cqr;
3699         int rc;
3700         struct ccw1 *ccw;
3701         int useglobal;
3702         struct dasd_snid_ioctl_data usrparm;
3703
3704         if (!capable(CAP_SYS_ADMIN))
3705                 return -EACCES;
3706
3707         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3708                 return -EFAULT;
3709
3710         useglobal = 0;
3711         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
3712                                    sizeof(struct dasd_snid_data), device);
3713         if (IS_ERR(cqr)) {
3714                 mutex_lock(&dasd_reserve_mutex);
3715                 useglobal = 1;
3716                 cqr = &dasd_reserve_req->cqr;
3717                 memset(cqr, 0, sizeof(*cqr));
3718                 memset(&dasd_reserve_req->ccw, 0,
3719                        sizeof(dasd_reserve_req->ccw));
3720                 cqr->cpaddr = &dasd_reserve_req->ccw;
3721                 cqr->data = &dasd_reserve_req->data;
3722                 cqr->magic = DASD_ECKD_MAGIC;
3723         }
3724         ccw = cqr->cpaddr;
3725         ccw->cmd_code = DASD_ECKD_CCW_SNID;
3726         ccw->flags |= CCW_FLAG_SLI;
3727         ccw->count = 12;
3728         ccw->cda = (__u32)(addr_t) cqr->data;
3729         cqr->startdev = device;
3730         cqr->memdev = device;
3731         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3732         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3733         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
3734         cqr->retries = 5;
3735         cqr->expires = 10 * HZ;
3736         cqr->buildclk = get_tod_clock();
3737         cqr->status = DASD_CQR_FILLED;
3738         cqr->lpm = usrparm.path_mask;
3739
3740         rc = dasd_sleep_on_immediatly(cqr);
3741         /* verify that I/O processing didn't modify the path mask */
3742         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
3743                 rc = -EIO;
3744         if (!rc) {
3745                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
3746                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
3747                         rc = -EFAULT;
3748         }
3749
3750         if (useglobal)
3751                 mutex_unlock(&dasd_reserve_mutex);
3752         else
3753                 dasd_sfree_request(cqr, cqr->memdev);
3754         return rc;
3755 }
3756
3757 /*
3758  * Read performance statistics
3759  */
3760 static int
3761 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
3762 {
3763         struct dasd_psf_prssd_data *prssdp;
3764         struct dasd_rssd_perf_stats_t *stats;
3765         struct dasd_ccw_req *cqr;
3766         struct ccw1 *ccw;
3767         int rc;
3768
3769         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
3770                                    (sizeof(struct dasd_psf_prssd_data) +
3771                                     sizeof(struct dasd_rssd_perf_stats_t)),
3772                                    device);
3773         if (IS_ERR(cqr)) {
3774                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3775                             "Could not allocate initialization request");
3776                 return PTR_ERR(cqr);
3777         }
3778         cqr->startdev = device;
3779         cqr->memdev = device;
3780         cqr->retries = 0;
3781         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3782         cqr->expires = 10 * HZ;
3783
3784         /* Prepare for Read Subsystem Data */
3785         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3786         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
3787         prssdp->order = PSF_ORDER_PRSSD;
3788         prssdp->suborder = 0x01;        /* Performance Statistics */
3789         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
3790
3791         ccw = cqr->cpaddr;
3792         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3793         ccw->count = sizeof(struct dasd_psf_prssd_data);
3794         ccw->flags |= CCW_FLAG_CC;
3795         ccw->cda = (__u32)(addr_t) prssdp;
3796
3797         /* Read Subsystem Data - Performance Statistics */
3798         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3799         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
3800
3801         ccw++;
3802         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3803         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
3804         ccw->cda = (__u32)(addr_t) stats;
3805
3806         cqr->buildclk = get_tod_clock();
3807         cqr->status = DASD_CQR_FILLED;
3808         rc = dasd_sleep_on(cqr);
3809         if (rc == 0) {
3810                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3811                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3812                 if (copy_to_user(argp, stats,
3813                                  sizeof(struct dasd_rssd_perf_stats_t)))
3814                         rc = -EFAULT;
3815         }
3816         dasd_sfree_request(cqr, cqr->memdev);
3817         return rc;
3818 }
3819
3820 /*
3821  * Get attributes (cache operations)
3822  * Returnes the cache attributes used in Define Extend (DE).
3823  */
3824 static int
3825 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
3826 {
3827         struct dasd_eckd_private *private =
3828                 (struct dasd_eckd_private *)device->private;
3829         struct attrib_data_t attrib = private->attrib;
3830         int rc;
3831
3832         if (!capable(CAP_SYS_ADMIN))
3833                 return -EACCES;
3834         if (!argp)
3835                 return -EINVAL;
3836
3837         rc = 0;
3838         if (copy_to_user(argp, (long *) &attrib,
3839                          sizeof(struct attrib_data_t)))
3840                 rc = -EFAULT;
3841
3842         return rc;
3843 }
3844
3845 /*
3846  * Set attributes (cache operations)
3847  * Stores the attributes for cache operation to be used in Define Extend (DE).
3848  */
3849 static int
3850 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
3851 {
3852         struct dasd_eckd_private *private =
3853                 (struct dasd_eckd_private *)device->private;
3854         struct attrib_data_t attrib;
3855
3856         if (!capable(CAP_SYS_ADMIN))
3857                 return -EACCES;
3858         if (!argp)
3859                 return -EINVAL;
3860
3861         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
3862                 return -EFAULT;
3863         private->attrib = attrib;
3864
3865         dev_info(&device->cdev->dev,
3866                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
3867                  private->attrib.operation, private->attrib.nr_cyl);
3868         return 0;
3869 }
3870
3871 /*
3872  * Issue syscall I/O to EMC Symmetrix array.
3873  * CCWs are PSF and RSSD
3874  */
3875 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
3876 {
3877         struct dasd_symmio_parms usrparm;
3878         char *psf_data, *rssd_result;
3879         struct dasd_ccw_req *cqr;
3880         struct ccw1 *ccw;
3881         char psf0, psf1;
3882         int rc;
3883
3884         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
3885                 return -EACCES;
3886         psf0 = psf1 = 0;
3887
3888         /* Copy parms from caller */
3889         rc = -EFAULT;
3890         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3891                 goto out;
3892         if (is_compat_task() || sizeof(long) == 4) {
3893                 /* Make sure pointers are sane even on 31 bit. */
3894                 rc = -EINVAL;
3895                 if ((usrparm.psf_data >> 32) != 0)
3896                         goto out;
3897                 if ((usrparm.rssd_result >> 32) != 0)
3898                         goto out;
3899                 usrparm.psf_data &= 0x7fffffffULL;
3900                 usrparm.rssd_result &= 0x7fffffffULL;
3901         }
3902         /* alloc I/O data area */
3903         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
3904         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
3905         if (!psf_data || !rssd_result) {
3906                 rc = -ENOMEM;
3907                 goto out_free;
3908         }
3909
3910         /* get syscall header from user space */
3911         rc = -EFAULT;
3912         if (copy_from_user(psf_data,
3913                            (void __user *)(unsigned long) usrparm.psf_data,
3914                            usrparm.psf_data_len))
3915                 goto out_free;
3916         psf0 = psf_data[0];
3917         psf1 = psf_data[1];
3918
3919         /* setup CCWs for PSF + RSSD */
3920         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
3921         if (IS_ERR(cqr)) {
3922                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3923                         "Could not allocate initialization request");
3924                 rc = PTR_ERR(cqr);
3925                 goto out_free;
3926         }
3927
3928         cqr->startdev = device;
3929         cqr->memdev = device;
3930         cqr->retries = 3;
3931         cqr->expires = 10 * HZ;
3932         cqr->buildclk = get_tod_clock();
3933         cqr->status = DASD_CQR_FILLED;
3934
3935         /* Build the ccws */
3936         ccw = cqr->cpaddr;
3937
3938         /* PSF ccw */
3939         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3940         ccw->count = usrparm.psf_data_len;
3941         ccw->flags |= CCW_FLAG_CC;
3942         ccw->cda = (__u32)(addr_t) psf_data;
3943
3944         ccw++;
3945
3946         /* RSSD ccw  */
3947         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3948         ccw->count = usrparm.rssd_result_len;
3949         ccw->flags = CCW_FLAG_SLI ;
3950         ccw->cda = (__u32)(addr_t) rssd_result;
3951
3952         rc = dasd_sleep_on(cqr);
3953         if (rc)
3954                 goto out_sfree;
3955
3956         rc = -EFAULT;
3957         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
3958                            rssd_result, usrparm.rssd_result_len))
3959                 goto out_sfree;
3960         rc = 0;
3961
3962 out_sfree:
3963         dasd_sfree_request(cqr, cqr->memdev);
3964 out_free:
3965         kfree(rssd_result);
3966         kfree(psf_data);
3967 out:
3968         DBF_DEV_EVENT(DBF_WARNING, device,
3969                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
3970                       (int) psf0, (int) psf1, rc);
3971         return rc;
3972 }
3973
3974 static int
3975 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
3976 {
3977         struct dasd_device *device = block->base;
3978
3979         switch (cmd) {
3980         case BIODASDGATTR:
3981                 return dasd_eckd_get_attrib(device, argp);
3982         case BIODASDSATTR:
3983                 return dasd_eckd_set_attrib(device, argp);
3984         case BIODASDPSRD:
3985                 return dasd_eckd_performance(device, argp);
3986         case BIODASDRLSE:
3987                 return dasd_eckd_release(device);
3988         case BIODASDRSRV:
3989                 return dasd_eckd_reserve(device);
3990         case BIODASDSLCK:
3991                 return dasd_eckd_steal_lock(device);
3992         case BIODASDSNID:
3993                 return dasd_eckd_snid(device, argp);
3994         case BIODASDSYMMIO:
3995                 return dasd_symm_io(device, argp);
3996         default:
3997                 return -ENOTTY;
3998         }
3999 }
4000
4001 /*
4002  * Dump the range of CCWs into 'page' buffer
4003  * and return number of printed chars.
4004  */
4005 static int
4006 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
4007 {
4008         int len, count;
4009         char *datap;
4010
4011         len = 0;
4012         while (from <= to) {
4013                 len += sprintf(page + len, PRINTK_HEADER
4014                                " CCW %p: %08X %08X DAT:",
4015                                from, ((int *) from)[0], ((int *) from)[1]);
4016
4017                 /* get pointer to data (consider IDALs) */
4018                 if (from->flags & CCW_FLAG_IDA)
4019                         datap = (char *) *((addr_t *) (addr_t) from->cda);
4020                 else
4021                         datap = (char *) ((addr_t) from->cda);
4022
4023                 /* dump data (max 32 bytes) */
4024                 for (count = 0; count < from->count && count < 32; count++) {
4025                         if (count % 8 == 0) len += sprintf(page + len, " ");
4026                         if (count % 4 == 0) len += sprintf(page + len, " ");
4027                         len += sprintf(page + len, "%02x", datap[count]);
4028                 }
4029                 len += sprintf(page + len, "\n");
4030                 from++;
4031         }
4032         return len;
4033 }
4034
4035 static void
4036 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
4037                          char *reason)
4038 {
4039         u64 *sense;
4040         u64 *stat;
4041
4042         sense = (u64 *) dasd_get_sense(irb);
4043         stat = (u64 *) &irb->scsw;
4044         if (sense) {
4045                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
4046                               "%016llx %016llx %016llx %016llx",
4047                               reason, *stat, *((u32 *) (stat + 1)),
4048                               sense[0], sense[1], sense[2], sense[3]);
4049         } else {
4050                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
4051                               reason, *stat, *((u32 *) (stat + 1)),
4052                               "NO VALID SENSE");
4053         }
4054 }
4055
4056 /*
4057  * Print sense data and related channel program.
4058  * Parts are printed because printk buffer is only 1024 bytes.
4059  */
4060 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
4061                                  struct dasd_ccw_req *req, struct irb *irb)
4062 {
4063         char *page;
4064         struct ccw1 *first, *last, *fail, *from, *to;
4065         int len, sl, sct;
4066
4067         page = (char *) get_zeroed_page(GFP_ATOMIC);
4068         if (page == NULL) {
4069                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4070                               "No memory to dump sense data\n");
4071                 return;
4072         }
4073         /* dump the sense data */
4074         len = sprintf(page, PRINTK_HEADER
4075                       " I/O status report for device %s:\n",
4076                       dev_name(&device->cdev->dev));
4077         len += sprintf(page + len, PRINTK_HEADER
4078                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4079                        "CS:%02X RC:%d\n",
4080                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4081                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4082                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4083                        req ? req->intrc : 0);
4084         len += sprintf(page + len, PRINTK_HEADER
4085                        " device %s: Failing CCW: %p\n",
4086                        dev_name(&device->cdev->dev),
4087                        (void *) (addr_t) irb->scsw.cmd.cpa);
4088         if (irb->esw.esw0.erw.cons) {
4089                 for (sl = 0; sl < 4; sl++) {
4090                         len += sprintf(page + len, PRINTK_HEADER
4091                                        " Sense(hex) %2d-%2d:",
4092                                        (8 * sl), ((8 * sl) + 7));
4093
4094                         for (sct = 0; sct < 8; sct++) {
4095                                 len += sprintf(page + len, " %02x",
4096                                                irb->ecw[8 * sl + sct]);
4097                         }
4098                         len += sprintf(page + len, "\n");
4099                 }
4100
4101                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
4102                         /* 24 Byte Sense Data */
4103                         sprintf(page + len, PRINTK_HEADER
4104                                 " 24 Byte: %x MSG %x, "
4105                                 "%s MSGb to SYSOP\n",
4106                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
4107                                 irb->ecw[1] & 0x10 ? "" : "no");
4108                 } else {
4109                         /* 32 Byte Sense Data */
4110                         sprintf(page + len, PRINTK_HEADER
4111                                 " 32 Byte: Format: %x "
4112                                 "Exception class %x\n",
4113                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
4114                 }
4115         } else {
4116                 sprintf(page + len, PRINTK_HEADER
4117                         " SORRY - NO VALID SENSE AVAILABLE\n");
4118         }
4119         printk(KERN_ERR "%s", page);
4120
4121         if (req) {
4122                 /* req == NULL for unsolicited interrupts */
4123                 /* dump the Channel Program (max 140 Bytes per line) */
4124                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
4125                 first = req->cpaddr;
4126                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
4127                 to = min(first + 6, last);
4128                 len = sprintf(page, PRINTK_HEADER
4129                               " Related CP in req: %p\n", req);
4130                 dasd_eckd_dump_ccw_range(first, to, page + len);
4131                 printk(KERN_ERR "%s", page);
4132
4133                 /* print failing CCW area (maximum 4) */
4134                 /* scsw->cda is either valid or zero  */
4135                 len = 0;
4136                 from = ++to;
4137                 fail = (struct ccw1 *)(addr_t)
4138                                 irb->scsw.cmd.cpa; /* failing CCW */
4139                 if (from <  fail - 2) {
4140                         from = fail - 2;     /* there is a gap - print header */
4141                         len += sprintf(page, PRINTK_HEADER "......\n");
4142                 }
4143                 to = min(fail + 1, last);
4144                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
4145
4146                 /* print last CCWs (maximum 2) */
4147                 from = max(from, ++to);
4148                 if (from < last - 1) {
4149                         from = last - 1;     /* there is a gap - print header */
4150                         len += sprintf(page + len, PRINTK_HEADER "......\n");
4151                 }
4152                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
4153                 if (len > 0)
4154                         printk(KERN_ERR "%s", page);
4155         }
4156         free_page((unsigned long) page);
4157 }
4158
4159
4160 /*
4161  * Print sense data from a tcw.
4162  */
4163 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4164                                  struct dasd_ccw_req *req, struct irb *irb)
4165 {
4166         char *page;
4167         int len, sl, sct, residual;
4168         struct tsb *tsb;
4169         u8 *sense, *rcq;
4170
4171         page = (char *) get_zeroed_page(GFP_ATOMIC);
4172         if (page == NULL) {
4173                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4174                             "No memory to dump sense data");
4175                 return;
4176         }
4177         /* dump the sense data */
4178         len = sprintf(page, PRINTK_HEADER
4179                       " I/O status report for device %s:\n",
4180                       dev_name(&device->cdev->dev));
4181         len += sprintf(page + len, PRINTK_HEADER
4182                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4183                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4184                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4185                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4186                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4187                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
4188                        req ? req->intrc : 0);
4189         len += sprintf(page + len, PRINTK_HEADER
4190                        " device %s: Failing TCW: %p\n",
4191                        dev_name(&device->cdev->dev),
4192                        (void *) (addr_t) irb->scsw.tm.tcw);
4193
4194         tsb = NULL;
4195         sense = NULL;
4196         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4197                 tsb = tcw_get_tsb(
4198                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4199
4200         if (tsb) {
4201                 len += sprintf(page + len, PRINTK_HEADER
4202                                " tsb->length %d\n", tsb->length);
4203                 len += sprintf(page + len, PRINTK_HEADER
4204                                " tsb->flags %x\n", tsb->flags);
4205                 len += sprintf(page + len, PRINTK_HEADER
4206                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
4207                 len += sprintf(page + len, PRINTK_HEADER
4208                                " tsb->count %d\n", tsb->count);
4209                 residual = tsb->count - 28;
4210                 len += sprintf(page + len, PRINTK_HEADER
4211                                " residual %d\n", residual);
4212
4213                 switch (tsb->flags & 0x07) {
4214                 case 1: /* tsa_iostat */
4215                         len += sprintf(page + len, PRINTK_HEADER
4216                                " tsb->tsa.iostat.dev_time %d\n",
4217                                        tsb->tsa.iostat.dev_time);
4218                         len += sprintf(page + len, PRINTK_HEADER
4219                                " tsb->tsa.iostat.def_time %d\n",
4220                                        tsb->tsa.iostat.def_time);
4221                         len += sprintf(page + len, PRINTK_HEADER
4222                                " tsb->tsa.iostat.queue_time %d\n",
4223                                        tsb->tsa.iostat.queue_time);
4224                         len += sprintf(page + len, PRINTK_HEADER
4225                                " tsb->tsa.iostat.dev_busy_time %d\n",
4226                                        tsb->tsa.iostat.dev_busy_time);
4227                         len += sprintf(page + len, PRINTK_HEADER
4228                                " tsb->tsa.iostat.dev_act_time %d\n",
4229                                        tsb->tsa.iostat.dev_act_time);
4230                         sense = tsb->tsa.iostat.sense;
4231                         break;
4232                 case 2: /* ts_ddpc */
4233                         len += sprintf(page + len, PRINTK_HEADER
4234                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4235                         for (sl = 0; sl < 2; sl++) {
4236                                 len += sprintf(page + len, PRINTK_HEADER
4237                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
4238                                                (8 * sl), ((8 * sl) + 7));
4239                                 rcq = tsb->tsa.ddpc.rcq;
4240                                 for (sct = 0; sct < 8; sct++) {
4241                                         len += sprintf(page + len, " %02x",
4242                                                        rcq[8 * sl + sct]);
4243                                 }
4244                                 len += sprintf(page + len, "\n");
4245                         }
4246                         sense = tsb->tsa.ddpc.sense;
4247                         break;
4248                 case 3: /* tsa_intrg */
4249                         len += sprintf(page + len, PRINTK_HEADER
4250                                       " tsb->tsa.intrg.: not supportet yet\n");
4251                         break;
4252                 }
4253
4254                 if (sense) {
4255                         for (sl = 0; sl < 4; sl++) {
4256                                 len += sprintf(page + len, PRINTK_HEADER
4257                                                " Sense(hex) %2d-%2d:",
4258                                                (8 * sl), ((8 * sl) + 7));
4259                                 for (sct = 0; sct < 8; sct++) {
4260                                         len += sprintf(page + len, " %02x",
4261                                                        sense[8 * sl + sct]);
4262                                 }
4263                                 len += sprintf(page + len, "\n");
4264                         }
4265
4266                         if (sense[27] & DASD_SENSE_BIT_0) {
4267                                 /* 24 Byte Sense Data */
4268                                 sprintf(page + len, PRINTK_HEADER
4269                                         " 24 Byte: %x MSG %x, "
4270                                         "%s MSGb to SYSOP\n",
4271                                         sense[7] >> 4, sense[7] & 0x0f,
4272                                         sense[1] & 0x10 ? "" : "no");
4273                         } else {
4274                                 /* 32 Byte Sense Data */
4275                                 sprintf(page + len, PRINTK_HEADER
4276                                         " 32 Byte: Format: %x "
4277                                         "Exception class %x\n",
4278                                         sense[6] & 0x0f, sense[22] >> 4);
4279                         }
4280                 } else {
4281                         sprintf(page + len, PRINTK_HEADER
4282                                 " SORRY - NO VALID SENSE AVAILABLE\n");
4283                 }
4284         } else {
4285                 sprintf(page + len, PRINTK_HEADER
4286                         " SORRY - NO TSB DATA AVAILABLE\n");
4287         }
4288         printk(KERN_ERR "%s", page);
4289         free_page((unsigned long) page);
4290 }
4291
4292 static void dasd_eckd_dump_sense(struct dasd_device *device,
4293                                  struct dasd_ccw_req *req, struct irb *irb)
4294 {
4295         if (scsw_is_tm(&irb->scsw))
4296                 dasd_eckd_dump_sense_tcw(device, req, irb);
4297         else
4298                 dasd_eckd_dump_sense_ccw(device, req, irb);
4299 }
4300
4301 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4302 {
4303         /*
4304          * the device should be disconnected from our LCU structure
4305          * on restore we will reconnect it and reread LCU specific
4306          * information like PAV support that might have changed
4307          */
4308         dasd_alias_remove_device(device);
4309         dasd_alias_disconnect_device_from_lcu(device);
4310
4311         return 0;
4312 }
4313
4314 static int dasd_eckd_restore_device(struct dasd_device *device)
4315 {
4316         struct dasd_eckd_private *private;
4317         struct dasd_eckd_characteristics temp_rdc_data;
4318         int rc;
4319         struct dasd_uid temp_uid;
4320         unsigned long flags;
4321         unsigned long cqr_flags = 0;
4322
4323         private = (struct dasd_eckd_private *) device->private;
4324
4325         /* Read Configuration Data */
4326         dasd_eckd_read_conf(device);
4327
4328         dasd_eckd_get_uid(device, &temp_uid);
4329         /* Generate device unique id */
4330         rc = dasd_eckd_generate_uid(device);
4331         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4332         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4333                 dev_err(&device->cdev->dev, "The UID of the DASD has "
4334                         "changed\n");
4335         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4336         if (rc)
4337                 goto out_err;
4338
4339         /* register lcu with alias handling, enable PAV if this is a new lcu */
4340         rc = dasd_alias_make_device_known_to_lcu(device);
4341         if (rc)
4342                 return rc;
4343
4344         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
4345         dasd_eckd_validate_server(device, cqr_flags);
4346
4347         /* RE-Read Configuration Data */
4348         dasd_eckd_read_conf(device);
4349
4350         /* Read Feature Codes */
4351         dasd_eckd_read_features(device);
4352
4353         /* Read Device Characteristics */
4354         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4355                                          &temp_rdc_data, 64);
4356         if (rc) {
4357                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4358                                 "Read device characteristic failed, rc=%d", rc);
4359                 goto out_err;
4360         }
4361         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4362         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4363         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4364
4365         /* add device to alias management */
4366         dasd_alias_add_device(device);
4367
4368         return 0;
4369
4370 out_err:
4371         return -1;
4372 }
4373
4374 static int dasd_eckd_reload_device(struct dasd_device *device)
4375 {
4376         struct dasd_eckd_private *private;
4377         int rc, old_base;
4378         char print_uid[60];
4379         struct dasd_uid uid;
4380         unsigned long flags;
4381
4382         private = (struct dasd_eckd_private *) device->private;
4383
4384         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4385         old_base = private->uid.base_unit_addr;
4386         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4387
4388         /* Read Configuration Data */
4389         rc = dasd_eckd_read_conf(device);
4390         if (rc)
4391                 goto out_err;
4392
4393         rc = dasd_eckd_generate_uid(device);
4394         if (rc)
4395                 goto out_err;
4396         /*
4397          * update unit address configuration and
4398          * add device to alias management
4399          */
4400         dasd_alias_update_add_device(device);
4401
4402         dasd_eckd_get_uid(device, &uid);
4403
4404         if (old_base != uid.base_unit_addr) {
4405                 if (strlen(uid.vduit) > 0)
4406                         snprintf(print_uid, sizeof(print_uid),
4407                                  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
4408                                  uid.ssid, uid.base_unit_addr, uid.vduit);
4409                 else
4410                         snprintf(print_uid, sizeof(print_uid),
4411                                  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
4412                                  uid.ssid, uid.base_unit_addr);
4413
4414                 dev_info(&device->cdev->dev,
4415                          "An Alias device was reassigned to a new base device "
4416                          "with UID: %s\n", print_uid);
4417         }
4418         return 0;
4419
4420 out_err:
4421         return -1;
4422 }
4423
4424 static struct ccw_driver dasd_eckd_driver = {
4425         .driver = {
4426                 .name   = "dasd-eckd",
4427                 .owner  = THIS_MODULE,
4428         },
4429         .ids         = dasd_eckd_ids,
4430         .probe       = dasd_eckd_probe,
4431         .remove      = dasd_generic_remove,
4432         .set_offline = dasd_generic_set_offline,
4433         .set_online  = dasd_eckd_set_online,
4434         .notify      = dasd_generic_notify,
4435         .path_event  = dasd_generic_path_event,
4436         .shutdown    = dasd_generic_shutdown,
4437         .freeze      = dasd_generic_pm_freeze,
4438         .thaw        = dasd_generic_restore_device,
4439         .restore     = dasd_generic_restore_device,
4440         .uc_handler  = dasd_generic_uc_handler,
4441         .int_class   = IRQIO_DAS,
4442 };
4443
4444 /*
4445  * max_blocks is dependent on the amount of storage that is available
4446  * in the static io buffer for each device. Currently each device has
4447  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
4448  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
4449  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
4450  * addition we have one define extent ccw + 16 bytes of data and one
4451  * locate record ccw + 16 bytes of data. That makes:
4452  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
4453  * We want to fit two into the available memory so that we can immediately
4454  * start the next request if one finishes off. That makes 249.5 blocks
4455  * for one request. Give a little safety and the result is 240.
4456  */
4457 static struct dasd_discipline dasd_eckd_discipline = {
4458         .owner = THIS_MODULE,
4459         .name = "ECKD",
4460         .ebcname = "ECKD",
4461         .max_blocks = 190,
4462         .check_device = dasd_eckd_check_characteristics,
4463         .uncheck_device = dasd_eckd_uncheck_device,
4464         .do_analysis = dasd_eckd_do_analysis,
4465         .verify_path = dasd_eckd_verify_path,
4466         .basic_to_ready = dasd_eckd_basic_to_ready,
4467         .online_to_ready = dasd_eckd_online_to_ready,
4468         .ready_to_basic = dasd_eckd_ready_to_basic,
4469         .fill_geometry = dasd_eckd_fill_geometry,
4470         .start_IO = dasd_start_IO,
4471         .term_IO = dasd_term_IO,
4472         .handle_terminated_request = dasd_eckd_handle_terminated_request,
4473         .format_device = dasd_eckd_format_device,
4474         .erp_action = dasd_eckd_erp_action,
4475         .erp_postaction = dasd_eckd_erp_postaction,
4476         .check_for_device_change = dasd_eckd_check_for_device_change,
4477         .build_cp = dasd_eckd_build_alias_cp,
4478         .free_cp = dasd_eckd_free_alias_cp,
4479         .dump_sense = dasd_eckd_dump_sense,
4480         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
4481         .fill_info = dasd_eckd_fill_info,
4482         .ioctl = dasd_eckd_ioctl,
4483         .freeze = dasd_eckd_pm_freeze,
4484         .restore = dasd_eckd_restore_device,
4485         .reload = dasd_eckd_reload_device,
4486         .get_uid = dasd_eckd_get_uid,
4487         .kick_validate = dasd_eckd_kick_validate_server,
4488 };
4489
4490 static int __init
4491 dasd_eckd_init(void)
4492 {
4493         int ret;
4494
4495         ASCEBC(dasd_eckd_discipline.ebcname, 4);
4496         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
4497                                    GFP_KERNEL | GFP_DMA);
4498         if (!dasd_reserve_req)
4499                 return -ENOMEM;
4500         path_verification_worker = kmalloc(sizeof(*path_verification_worker),
4501                                    GFP_KERNEL | GFP_DMA);
4502         if (!path_verification_worker) {
4503                 kfree(dasd_reserve_req);
4504                 return -ENOMEM;
4505         }
4506         rawpadpage = (void *)__get_free_page(GFP_KERNEL);
4507         if (!rawpadpage) {
4508                 kfree(path_verification_worker);
4509                 kfree(dasd_reserve_req);
4510                 return -ENOMEM;
4511         }
4512         ret = ccw_driver_register(&dasd_eckd_driver);
4513         if (!ret)
4514                 wait_for_device_probe();
4515         else {
4516                 kfree(path_verification_worker);
4517                 kfree(dasd_reserve_req);
4518                 free_page((unsigned long)rawpadpage);
4519         }
4520         return ret;
4521 }
4522
4523 static void __exit
4524 dasd_eckd_cleanup(void)
4525 {
4526         ccw_driver_unregister(&dasd_eckd_driver);
4527         kfree(path_verification_worker);
4528         kfree(dasd_reserve_req);
4529         free_page((unsigned long)rawpadpage);
4530 }
4531
4532 module_init(dasd_eckd_init);
4533 module_exit(dasd_eckd_cleanup);