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 #include <linux/seq_file.h>
  23
  24 #include <asm/css_chars.h>
  25 #include <asm/debug.h>
  26 #include <asm/idals.h>
  27 #include <asm/ebcdic.h>
  28 #include <asm/io.h>
  29 #include <asm/uaccess.h>
  30 #include <asm/cio.h>
  31 #include <asm/ccwdev.h>
  32 #include <asm/itcw.h>
  33 #include <asm/schid.h>
  34 #include <asm/chpid.h>
  35
  36 #include "dasd_int.h"
  37 #include "dasd_eckd.h"
  38
  39 #ifdef PRINTK_HEADER
  40 #undef PRINTK_HEADER
  41 #endif                          /* PRINTK_HEADER */
  42 #define PRINTK_HEADER "dasd(eckd):"
  43
  44 #define ECKD_C0(i) (i->home_bytes)
  45 #define ECKD_F(i) (i->formula)
  46 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
  47                     (i->factors.f_0x02.f1))
  48 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
  49                     (i->factors.f_0x02.f2))
  50 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
  51                     (i->factors.f_0x02.f3))
  52 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
  53 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
  54 #define ECKD_F6(i) (i->factor6)
  55 #define ECKD_F7(i) (i->factor7)
  56 #define ECKD_F8(i) (i->factor8)
  57
  58 /*
  59  * raw track access always map to 64k in memory
  60  * so it maps to 16 blocks of 4k per track
  61  */
  62 #define DASD_RAW_BLOCK_PER_TRACK 16
  63 #define DASD_RAW_BLOCKSIZE 4096
  64 /* 64k are 128 x 512 byte sectors  */
  65 #define DASD_RAW_SECTORS_PER_TRACK 128
  66
  67 MODULE_LICENSE("GPL");
  68
  69 static struct dasd_discipline dasd_eckd_discipline;
  70
  71 /* The ccw bus type uses this table to find devices that it sends to
  72  * dasd_eckd_probe */
  73 static struct ccw_device_id dasd_eckd_ids[] = {
  74         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
  75         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
  76         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
  77         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
  78         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
  79         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
  80         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
  81         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
  82         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
  83         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
  84         { /* end of list */ },
  85 };
  86
  87 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  88
  89 static struct ccw_driver dasd_eckd_driver; /* see below */
  90
  91 static void *rawpadpage;
  92
  93 #define INIT_CQR_OK 0
  94 #define INIT_CQR_UNFORMATTED 1
  95 #define INIT_CQR_ERROR 2
  96
  97 /* emergency request for reserve/release */
  98 static struct {
  99         struct dasd_ccw_req cqr;
 100         struct ccw1 ccw;
 101         char data[32];
 102 } *dasd_reserve_req;
 103 static DEFINE_MUTEX(dasd_reserve_mutex);
 104
 105 /* definitions for the path verification worker */
 106 struct path_verification_work_data {
 107         struct work_struct worker;
 108         struct dasd_device *device;
 109         struct dasd_ccw_req cqr;
 110         struct ccw1 ccw;
 111         __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
 112         int isglobal;
 113         __u8 tbvpm;
 114 };
 115 static struct path_verification_work_data *path_verification_worker;
 116 static DEFINE_MUTEX(dasd_path_verification_mutex);
 117
 118 struct check_attention_work_data {
 119         struct work_struct worker;
 120         struct dasd_device *device;
 121         __u8 lpum;
 122 };
 123
 124 static int prepare_itcw(struct itcw *, unsigned int, unsigned int, int,
 125                         struct dasd_device *, struct dasd_device *,
 126                         unsigned int, int, unsigned int, unsigned int,
 127                         unsigned int, unsigned int);
 128
 129 /* initial attempt at a probe function. this can be simplified once
 130  * the other detection code is gone */
 131 static int
 132 dasd_eckd_probe (struct ccw_device *cdev)
 133 {
 134         int ret;
 135
 136         /* set ECKD specific ccw-device options */
 137         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
 138                                      CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
 139         if (ret) {
 140                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
 141                                 "dasd_eckd_probe: could not set "
 142                                 "ccw-device options");
 143                 return ret;
 144         }
 145         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
 146         return ret;
 147 }
 148
 149 static int
 150 dasd_eckd_set_online(struct ccw_device *cdev)
 151 {
 152         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
 153 }
 154
 155 static const int sizes_trk0[] = { 28, 148, 84 };
 156 #define LABEL_SIZE 140
 157
 158 /* head and record addresses of count_area read in analysis ccw */
 159 static const int count_area_head[] = { 0, 0, 0, 0, 2 };
 160 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
 161
 162 static inline unsigned int
 163 round_up_multiple(unsigned int no, unsigned int mult)
 164 {
 165         int rem = no % mult;
 166         return (rem ? no - rem + mult : no);
 167 }
 168
 169 static inline unsigned int
 170 ceil_quot(unsigned int d1, unsigned int d2)
 171 {
 172         return (d1 + (d2 - 1)) / d2;
 173 }
 174
 175 static unsigned int
 176 recs_per_track(struct dasd_eckd_characteristics * rdc,
 177                unsigned int kl, unsigned int dl)
 178 {
 179         int dn, kn;
 180
 181         switch (rdc->dev_type) {
 182         case 0x3380:
 183                 if (kl)
 184                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 185                                        ceil_quot(dl + 12, 32));
 186                 else
 187                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 188         case 0x3390:
 189                 dn = ceil_quot(dl + 6, 232) + 1;
 190                 if (kl) {
 191                         kn = ceil_quot(kl + 6, 232) + 1;
 192                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 193                                        9 + ceil_quot(dl + 6 * dn, 34));
 194                 } else
 195                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 196         case 0x9345:
 197                 dn = ceil_quot(dl + 6, 232) + 1;
 198                 if (kl) {
 199                         kn = ceil_quot(kl + 6, 232) + 1;
 200                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 201                                        ceil_quot(dl + 6 * dn, 34));
 202                 } else
 203                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 204         }
 205         return 0;
 206 }
 207
 208 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
 209 {
 210         geo->cyl = (__u16) cyl;
 211         geo->head = cyl >> 16;
 212         geo->head <<= 4;
 213         geo->head |= head;
 214 }
 215
 216 static int
 217 check_XRC (struct ccw1         *de_ccw,
 218            struct DE_eckd_data *data,
 219            struct dasd_device  *device)
 220 {
 221         struct dasd_eckd_private *private = device->private;
 222         int rc;
 223
 224         if (!private->rdc_data.facilities.XRC_supported)
 225                 return 0;
 226
 227         /* switch on System Time Stamp - needed for XRC Support */
 228         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 229         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 230
 231         rc = get_phys_clock(&data->ep_sys_time);
 232         /* Ignore return code if sync clock is switched off. */
 233         if (rc == -EOPNOTSUPP || rc == -EACCES)
 234                 rc = 0;
 235
 236         de_ccw->count = sizeof(struct DE_eckd_data);
 237         de_ccw->flags |= CCW_FLAG_SLI;
 238         return rc;
 239 }
 240
 241 static int
 242 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
 243               unsigned int totrk, int cmd, struct dasd_device *device)
 244 {
 245         struct dasd_eckd_private *private = device->private;
 246         u32 begcyl, endcyl;
 247         u16 heads, beghead, endhead;
 248         int rc = 0;
 249
 250         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 251         ccw->flags = 0;
 252         ccw->count = 16;
 253         ccw->cda = (__u32) __pa(data);
 254
 255         memset(data, 0, sizeof(struct DE_eckd_data));
 256         switch (cmd) {
 257         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 258         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 259         case DASD_ECKD_CCW_READ:
 260         case DASD_ECKD_CCW_READ_MT:
 261         case DASD_ECKD_CCW_READ_CKD:
 262         case DASD_ECKD_CCW_READ_CKD_MT:
 263         case DASD_ECKD_CCW_READ_KD:
 264         case DASD_ECKD_CCW_READ_KD_MT:
 265                 data->mask.perm = 0x1;
 266                 data->attributes.operation = private->attrib.operation;
 267                 break;
 268         case DASD_ECKD_CCW_READ_COUNT:
 269                 data->mask.perm = 0x1;
 270                 data->attributes.operation = DASD_BYPASS_CACHE;
 271                 break;
 272         case DASD_ECKD_CCW_WRITE:
 273         case DASD_ECKD_CCW_WRITE_MT:
 274         case DASD_ECKD_CCW_WRITE_KD:
 275         case DASD_ECKD_CCW_WRITE_KD_MT:
 276                 data->mask.perm = 0x02;
 277                 data->attributes.operation = private->attrib.operation;
 278                 rc = check_XRC (ccw, data, device);
 279                 break;
 280         case DASD_ECKD_CCW_WRITE_CKD:
 281         case DASD_ECKD_CCW_WRITE_CKD_MT:
 282                 data->attributes.operation = DASD_BYPASS_CACHE;
 283                 rc = check_XRC (ccw, data, device);
 284                 break;
 285         case DASD_ECKD_CCW_ERASE:
 286         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 287         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 288                 data->mask.perm = 0x3;
 289                 data->mask.auth = 0x1;
 290                 data->attributes.operation = DASD_BYPASS_CACHE;
 291                 rc = check_XRC (ccw, data, device);
 292                 break;
 293         default:
 294                 dev_err(&device->cdev->dev,
 295                         "0x%x is not a known command\n", cmd);
 296                 break;
 297         }
 298
 299         data->attributes.mode = 0x3;    /* ECKD */
 300
 301         if ((private->rdc_data.cu_type == 0x2105 ||
 302              private->rdc_data.cu_type == 0x2107 ||
 303              private->rdc_data.cu_type == 0x1750)
 304             && !(private->uses_cdl && trk < 2))
 305                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 306
 307         heads = private->rdc_data.trk_per_cyl;
 308         begcyl = trk / heads;
 309         beghead = trk % heads;
 310         endcyl = totrk / heads;
 311         endhead = totrk % heads;
 312
 313         /* check for sequential prestage - enhance cylinder range */
 314         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 315             data->attributes.operation == DASD_SEQ_ACCESS) {
 316
 317                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
 318                         endcyl += private->attrib.nr_cyl;
 319                 else
 320                         endcyl = (private->real_cyl - 1);
 321         }
 322
 323         set_ch_t(&data->beg_ext, begcyl, beghead);
 324         set_ch_t(&data->end_ext, endcyl, endhead);
 325         return rc;
 326 }
 327
 328 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
 329                                struct dasd_device  *device)
 330 {
 331         struct dasd_eckd_private *private = device->private;
 332         int rc;
 333
 334         if (!private->rdc_data.facilities.XRC_supported)
 335                 return 0;
 336
 337         /* switch on System Time Stamp - needed for XRC Support */
 338         pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid'   */
 339         pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
 340         pfxdata->validity.time_stamp = 1;           /* 'Time Stamp Valid'   */
 341
 342         rc = get_phys_clock(&pfxdata->define_extent.ep_sys_time);
 343         /* Ignore return code if sync clock is switched off. */
 344         if (rc == -EOPNOTSUPP || rc == -EACCES)
 345                 rc = 0;
 346         return rc;
 347 }
 348
 349 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
 350                           unsigned int rec_on_trk, int count, int cmd,
 351                           struct dasd_device *device, unsigned int reclen,
 352                           unsigned int tlf)
 353 {
 354         struct dasd_eckd_private *private = device->private;
 355         int sector;
 356         int dn, d;
 357
 358         memset(data, 0, sizeof(*data));
 359         sector = 0;
 360         if (rec_on_trk) {
 361                 switch (private->rdc_data.dev_type) {
 362                 case 0x3390:
 363                         dn = ceil_quot(reclen + 6, 232);
 364                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 365                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 366                         break;
 367                 case 0x3380:
 368                         d = 7 + ceil_quot(reclen + 12, 32);
 369                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 370                         break;
 371                 }
 372         }
 373         data->sector = sector;
 374         /* note: meaning of count depends on the operation
 375          *       for record based I/O it's the number of records, but for
 376          *       track based I/O it's the number of tracks
 377          */
 378         data->count = count;
 379         switch (cmd) {
 380         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 381                 data->operation.orientation = 0x3;
 382                 data->operation.operation = 0x03;
 383                 break;
 384         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 385                 data->operation.orientation = 0x3;
 386                 data->operation.operation = 0x16;
 387                 break;
 388         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 389                 data->operation.orientation = 0x1;
 390                 data->operation.operation = 0x03;
 391                 data->count++;
 392                 break;
 393         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 394                 data->operation.orientation = 0x3;
 395                 data->operation.operation = 0x16;
 396                 data->count++;
 397                 break;
 398         case DASD_ECKD_CCW_WRITE:
 399         case DASD_ECKD_CCW_WRITE_MT:
 400         case DASD_ECKD_CCW_WRITE_KD:
 401         case DASD_ECKD_CCW_WRITE_KD_MT:
 402                 data->auxiliary.length_valid = 0x1;
 403                 data->length = reclen;
 404                 data->operation.operation = 0x01;
 405                 break;
 406         case DASD_ECKD_CCW_WRITE_CKD:
 407         case DASD_ECKD_CCW_WRITE_CKD_MT:
 408                 data->auxiliary.length_valid = 0x1;
 409                 data->length = reclen;
 410                 data->operation.operation = 0x03;
 411                 break;
 412         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 413                 data->operation.orientation = 0x0;
 414                 data->operation.operation = 0x3F;
 415                 data->extended_operation = 0x11;
 416                 data->length = 0;
 417                 data->extended_parameter_length = 0x02;
 418                 if (data->count > 8) {
 419                         data->extended_parameter[0] = 0xFF;
 420                         data->extended_parameter[1] = 0xFF;
 421                         data->extended_parameter[1] <<= (16 - count);
 422                 } else {
 423                         data->extended_parameter[0] = 0xFF;
 424                         data->extended_parameter[0] <<= (8 - count);
 425                         data->extended_parameter[1] = 0x00;
 426                 }
 427                 data->sector = 0xFF;
 428                 break;
 429         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 430                 data->auxiliary.length_valid = 0x1;
 431                 data->length = reclen;  /* not tlf, as one might think */
 432                 data->operation.operation = 0x3F;
 433                 data->extended_operation = 0x23;
 434                 break;
 435         case DASD_ECKD_CCW_READ:
 436         case DASD_ECKD_CCW_READ_MT:
 437         case DASD_ECKD_CCW_READ_KD:
 438         case DASD_ECKD_CCW_READ_KD_MT:
 439                 data->auxiliary.length_valid = 0x1;
 440                 data->length = reclen;
 441                 data->operation.operation = 0x06;
 442                 break;
 443         case DASD_ECKD_CCW_READ_CKD:
 444         case DASD_ECKD_CCW_READ_CKD_MT:
 445                 data->auxiliary.length_valid = 0x1;
 446                 data->length = reclen;
 447                 data->operation.operation = 0x16;
 448                 break;
 449         case DASD_ECKD_CCW_READ_COUNT:
 450                 data->operation.operation = 0x06;
 451                 break;
 452         case DASD_ECKD_CCW_READ_TRACK:
 453                 data->operation.orientation = 0x1;
 454                 data->operation.operation = 0x0C;
 455                 data->extended_parameter_length = 0;
 456                 data->sector = 0xFF;
 457                 break;
 458         case DASD_ECKD_CCW_READ_TRACK_DATA:
 459                 data->auxiliary.length_valid = 0x1;
 460                 data->length = tlf;
 461                 data->operation.operation = 0x0C;
 462                 break;
 463         case DASD_ECKD_CCW_ERASE:
 464                 data->length = reclen;
 465                 data->auxiliary.length_valid = 0x1;
 466                 data->operation.operation = 0x0b;
 467                 break;
 468         default:
 469                 DBF_DEV_EVENT(DBF_ERR, device,
 470                             "fill LRE unknown opcode 0x%x", cmd);
 471                 BUG();
 472         }
 473         set_ch_t(&data->seek_addr,
 474                  trk / private->rdc_data.trk_per_cyl,
 475                  trk % private->rdc_data.trk_per_cyl);
 476         data->search_arg.cyl = data->seek_addr.cyl;
 477         data->search_arg.head = data->seek_addr.head;
 478         data->search_arg.record = rec_on_trk;
 479 }
 480
 481 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 482                       unsigned int trk, unsigned int totrk, int cmd,
 483                       struct dasd_device *basedev, struct dasd_device *startdev,
 484                       unsigned char format, unsigned int rec_on_trk, int count,
 485                       unsigned int blksize, unsigned int tlf)
 486 {
 487         struct dasd_eckd_private *basepriv, *startpriv;
 488         struct DE_eckd_data *dedata;
 489         struct LRE_eckd_data *lredata;
 490         u32 begcyl, endcyl;
 491         u16 heads, beghead, endhead;
 492         int rc = 0;
 493
 494         basepriv = basedev->private;
 495         startpriv = startdev->private;
 496         dedata = &pfxdata->define_extent;
 497         lredata = &pfxdata->locate_record;
 498
 499         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 500         ccw->flags = 0;
 501         if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
 502                 ccw->count = sizeof(*pfxdata) + 2;
 503                 ccw->cda = (__u32) __pa(pfxdata);
 504                 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
 505         } else {
 506                 ccw->count = sizeof(*pfxdata);
 507                 ccw->cda = (__u32) __pa(pfxdata);
 508                 memset(pfxdata, 0, sizeof(*pfxdata));
 509         }
 510
 511         /* prefix data */
 512         if (format > 1) {
 513                 DBF_DEV_EVENT(DBF_ERR, basedev,
 514                               "PFX LRE unknown format 0x%x", format);
 515                 BUG();
 516                 return -EINVAL;
 517         }
 518         pfxdata->format = format;
 519         pfxdata->base_address = basepriv->ned->unit_addr;
 520         pfxdata->base_lss = basepriv->ned->ID;
 521         pfxdata->validity.define_extent = 1;
 522
 523         /* private uid is kept up to date, conf_data may be outdated */
 524         if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
 525                 pfxdata->validity.verify_base = 1;
 526
 527         if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
 528                 pfxdata->validity.verify_base = 1;
 529                 pfxdata->validity.hyper_pav = 1;
 530         }
 531
 532         /* define extend data (mostly)*/
 533         switch (cmd) {
 534         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 535         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 536         case DASD_ECKD_CCW_READ:
 537         case DASD_ECKD_CCW_READ_MT:
 538         case DASD_ECKD_CCW_READ_CKD:
 539         case DASD_ECKD_CCW_READ_CKD_MT:
 540         case DASD_ECKD_CCW_READ_KD:
 541         case DASD_ECKD_CCW_READ_KD_MT:
 542                 dedata->mask.perm = 0x1;
 543                 dedata->attributes.operation = basepriv->attrib.operation;
 544                 break;
 545         case DASD_ECKD_CCW_READ_COUNT:
 546                 dedata->mask.perm = 0x1;
 547                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 548                 break;
 549         case DASD_ECKD_CCW_READ_TRACK:
 550         case DASD_ECKD_CCW_READ_TRACK_DATA:
 551                 dedata->mask.perm = 0x1;
 552                 dedata->attributes.operation = basepriv->attrib.operation;
 553                 dedata->blk_size = 0;
 554                 break;
 555         case DASD_ECKD_CCW_WRITE:
 556         case DASD_ECKD_CCW_WRITE_MT:
 557         case DASD_ECKD_CCW_WRITE_KD:
 558         case DASD_ECKD_CCW_WRITE_KD_MT:
 559                 dedata->mask.perm = 0x02;
 560                 dedata->attributes.operation = basepriv->attrib.operation;
 561                 rc = check_XRC_on_prefix(pfxdata, basedev);
 562                 break;
 563         case DASD_ECKD_CCW_WRITE_CKD:
 564         case DASD_ECKD_CCW_WRITE_CKD_MT:
 565                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 566                 rc = check_XRC_on_prefix(pfxdata, basedev);
 567                 break;
 568         case DASD_ECKD_CCW_ERASE:
 569         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 570         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 571                 dedata->mask.perm = 0x3;
 572                 dedata->mask.auth = 0x1;
 573                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 574                 rc = check_XRC_on_prefix(pfxdata, basedev);
 575                 break;
 576         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 577                 dedata->mask.perm = 0x03;
 578                 dedata->attributes.operation = basepriv->attrib.operation;
 579                 dedata->blk_size = 0;
 580                 break;
 581         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 582                 dedata->mask.perm = 0x02;
 583                 dedata->attributes.operation = basepriv->attrib.operation;
 584                 dedata->blk_size = blksize;
 585                 rc = check_XRC_on_prefix(pfxdata, basedev);
 586                 break;
 587         default:
 588                 DBF_DEV_EVENT(DBF_ERR, basedev,
 589                             "PFX LRE unknown opcode 0x%x", cmd);
 590                 BUG();
 591                 return -EINVAL;
 592         }
 593
 594         dedata->attributes.mode = 0x3;  /* ECKD */
 595
 596         if ((basepriv->rdc_data.cu_type == 0x2105 ||
 597              basepriv->rdc_data.cu_type == 0x2107 ||
 598              basepriv->rdc_data.cu_type == 0x1750)
 599             && !(basepriv->uses_cdl && trk < 2))
 600                 dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
 601
 602         heads = basepriv->rdc_data.trk_per_cyl;
 603         begcyl = trk / heads;
 604         beghead = trk % heads;
 605         endcyl = totrk / heads;
 606         endhead = totrk % heads;
 607
 608         /* check for sequential prestage - enhance cylinder range */
 609         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
 610             dedata->attributes.operation == DASD_SEQ_ACCESS) {
 611
 612                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
 613                         endcyl += basepriv->attrib.nr_cyl;
 614                 else
 615                         endcyl = (basepriv->real_cyl - 1);
 616         }
 617
 618         set_ch_t(&dedata->beg_ext, begcyl, beghead);
 619         set_ch_t(&dedata->end_ext, endcyl, endhead);
 620
 621         if (format == 1) {
 622                 fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
 623                               basedev, blksize, tlf);
 624         }
 625
 626         return rc;
 627 }
 628
 629 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 630                   unsigned int trk, unsigned int totrk, int cmd,
 631                   struct dasd_device *basedev, struct dasd_device *startdev)
 632 {
 633         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
 634                           0, 0, 0, 0, 0);
 635 }
 636
 637 static void
 638 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
 639               unsigned int rec_on_trk, int no_rec, int cmd,
 640               struct dasd_device * device, int reclen)
 641 {
 642         struct dasd_eckd_private *private = device->private;
 643         int sector;
 644         int dn, d;
 645
 646         DBF_DEV_EVENT(DBF_INFO, device,
 647                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 648                   trk, rec_on_trk, no_rec, cmd, reclen);
 649
 650         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 651         ccw->flags = 0;
 652         ccw->count = 16;
 653         ccw->cda = (__u32) __pa(data);
 654
 655         memset(data, 0, sizeof(struct LO_eckd_data));
 656         sector = 0;
 657         if (rec_on_trk) {
 658                 switch (private->rdc_data.dev_type) {
 659                 case 0x3390:
 660                         dn = ceil_quot(reclen + 6, 232);
 661                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 662                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 663                         break;
 664                 case 0x3380:
 665                         d = 7 + ceil_quot(reclen + 12, 32);
 666                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 667                         break;
 668                 }
 669         }
 670         data->sector = sector;
 671         data->count = no_rec;
 672         switch (cmd) {
 673         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 674                 data->operation.orientation = 0x3;
 675                 data->operation.operation = 0x03;
 676                 break;
 677         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 678                 data->operation.orientation = 0x3;
 679                 data->operation.operation = 0x16;
 680                 break;
 681         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 682                 data->operation.orientation = 0x1;
 683                 data->operation.operation = 0x03;
 684                 data->count++;
 685                 break;
 686         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 687                 data->operation.orientation = 0x3;
 688                 data->operation.operation = 0x16;
 689                 data->count++;
 690                 break;
 691         case DASD_ECKD_CCW_WRITE:
 692         case DASD_ECKD_CCW_WRITE_MT:
 693         case DASD_ECKD_CCW_WRITE_KD:
 694         case DASD_ECKD_CCW_WRITE_KD_MT:
 695                 data->auxiliary.last_bytes_used = 0x1;
 696                 data->length = reclen;
 697                 data->operation.operation = 0x01;
 698                 break;
 699         case DASD_ECKD_CCW_WRITE_CKD:
 700         case DASD_ECKD_CCW_WRITE_CKD_MT:
 701                 data->auxiliary.last_bytes_used = 0x1;
 702                 data->length = reclen;
 703                 data->operation.operation = 0x03;
 704                 break;
 705         case DASD_ECKD_CCW_READ:
 706         case DASD_ECKD_CCW_READ_MT:
 707         case DASD_ECKD_CCW_READ_KD:
 708         case DASD_ECKD_CCW_READ_KD_MT:
 709                 data->auxiliary.last_bytes_used = 0x1;
 710                 data->length = reclen;
 711                 data->operation.operation = 0x06;
 712                 break;
 713         case DASD_ECKD_CCW_READ_CKD:
 714         case DASD_ECKD_CCW_READ_CKD_MT:
 715                 data->auxiliary.last_bytes_used = 0x1;
 716                 data->length = reclen;
 717                 data->operation.operation = 0x16;
 718                 break;
 719         case DASD_ECKD_CCW_READ_COUNT:
 720                 data->operation.operation = 0x06;
 721                 break;
 722         case DASD_ECKD_CCW_ERASE:
 723                 data->length = reclen;
 724                 data->auxiliary.last_bytes_used = 0x1;
 725                 data->operation.operation = 0x0b;
 726                 break;
 727         default:
 728                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
 729                               "opcode 0x%x", cmd);
 730         }
 731         set_ch_t(&data->seek_addr,
 732                  trk / private->rdc_data.trk_per_cyl,
 733                  trk % private->rdc_data.trk_per_cyl);
 734         data->search_arg.cyl = data->seek_addr.cyl;
 735         data->search_arg.head = data->seek_addr.head;
 736         data->search_arg.record = rec_on_trk;
 737 }
 738
 739 /*
 740  * Returns 1 if the block is one of the special blocks that needs
 741  * to get read/written with the KD variant of the command.
 742  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 743  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 744  * Luckily the KD variants differ only by one bit (0x08) from the
 745  * normal variant. So don't wonder about code like:
 746  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 747  *         ccw->cmd_code |= 0x8;
 748  */
 749 static inline int
 750 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 751 {
 752         if (recid < 3)
 753                 return 1;
 754         if (recid < blk_per_trk)
 755                 return 0;
 756         if (recid < 2 * blk_per_trk)
 757                 return 1;
 758         return 0;
 759 }
 760
 761 /*
 762  * Returns the record size for the special blocks of the cdl format.
 763  * Only returns something useful if dasd_eckd_cdl_special is true
 764  * for the recid.
 765  */
 766 static inline int
 767 dasd_eckd_cdl_reclen(int recid)
 768 {
 769         if (recid < 3)
 770                 return sizes_trk0[recid];
 771         return LABEL_SIZE;
 772 }
 773 /* create unique id from private structure. */
 774 static void create_uid(struct dasd_eckd_private *private)
 775 {
 776         int count;
 777         struct dasd_uid *uid;
 778
 779         uid = &private->uid;
 780         memset(uid, 0, sizeof(struct dasd_uid));
 781         memcpy(uid->vendor, private->ned->HDA_manufacturer,
 782                sizeof(uid->vendor) - 1);
 783         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 784         memcpy(uid->serial, private->ned->HDA_location,
 785                sizeof(uid->serial) - 1);
 786         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 787         uid->ssid = private->gneq->subsystemID;
 788         uid->real_unit_addr = private->ned->unit_addr;
 789         if (private->sneq) {
 790                 uid->type = private->sneq->sua_flags;
 791                 if (uid->type == UA_BASE_PAV_ALIAS)
 792                         uid->base_unit_addr = private->sneq->base_unit_addr;
 793         } else {
 794                 uid->type = UA_BASE_DEVICE;
 795         }
 796         if (private->vdsneq) {
 797                 for (count = 0; count < 16; count++) {
 798                         sprintf(uid->vduit+2*count, "%02x",
 799                                 private->vdsneq->uit[count]);
 800                 }
 801         }
 802 }
 803
 804 /*
 805  * Generate device unique id that specifies the physical device.
 806  */
 807 static int dasd_eckd_generate_uid(struct dasd_device *device)
 808 {
 809         struct dasd_eckd_private *private = device->private;
 810         unsigned long flags;
 811
 812         if (!private)
 813                 return -ENODEV;
 814         if (!private->ned || !private->gneq)
 815                 return -ENODEV;
 816         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 817         create_uid(private);
 818         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 819         return 0;
 820 }
 821
 822 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
 823 {
 824         struct dasd_eckd_private *private = device->private;
 825         unsigned long flags;
 826
 827         if (private) {
 828                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 829                 *uid = private->uid;
 830                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 831                 return 0;
 832         }
 833         return -EINVAL;
 834 }
 835
 836 /*
 837  * compare device UID with data of a given dasd_eckd_private structure
 838  * return 0 for match
 839  */
 840 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
 841                                       struct dasd_eckd_private *private)
 842 {
 843         struct dasd_uid device_uid;
 844
 845         create_uid(private);
 846         dasd_eckd_get_uid(device, &device_uid);
 847
 848         return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
 849 }
 850
 851 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
 852                                    struct dasd_ccw_req *cqr,
 853                                    __u8 *rcd_buffer,
 854                                    __u8 lpm)
 855 {
 856         struct ccw1 *ccw;
 857         /*
 858          * buffer has to start with EBCDIC "V1.0" to show
 859          * support for virtual device SNEQ
 860          */
 861         rcd_buffer[0] = 0xE5;
 862         rcd_buffer[1] = 0xF1;
 863         rcd_buffer[2] = 0x4B;
 864         rcd_buffer[3] = 0xF0;
 865
 866         ccw = cqr->cpaddr;
 867         ccw->cmd_code = DASD_ECKD_CCW_RCD;
 868         ccw->flags = 0;
 869         ccw->cda = (__u32)(addr_t)rcd_buffer;
 870         ccw->count = DASD_ECKD_RCD_DATA_SIZE;
 871         cqr->magic = DASD_ECKD_MAGIC;
 872
 873         cqr->startdev = device;
 874         cqr->memdev = device;
 875         cqr->block = NULL;
 876         cqr->expires = 10*HZ;
 877         cqr->lpm = lpm;
 878         cqr->retries = 256;
 879         cqr->buildclk = get_tod_clock();
 880         cqr->status = DASD_CQR_FILLED;
 881         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
 882 }
 883
 884 /*
 885  * Wakeup helper for read_conf
 886  * if the cqr is not done and needs some error recovery
 887  * the buffer has to be re-initialized with the EBCDIC "V1.0"
 888  * to show support for virtual device SNEQ
 889  */
 890 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
 891 {
 892         struct ccw1 *ccw;
 893         __u8 *rcd_buffer;
 894
 895         if (cqr->status !=  DASD_CQR_DONE) {
 896                 ccw = cqr->cpaddr;
 897                 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
 898                 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
 899
 900                 rcd_buffer[0] = 0xE5;
 901                 rcd_buffer[1] = 0xF1;
 902                 rcd_buffer[2] = 0x4B;
 903                 rcd_buffer[3] = 0xF0;
 904         }
 905         dasd_wakeup_cb(cqr, data);
 906 }
 907
 908 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
 909                                            struct dasd_ccw_req *cqr,
 910                                            __u8 *rcd_buffer,
 911                                            __u8 lpm)
 912 {
 913         struct ciw *ciw;
 914         int rc;
 915         /*
 916          * sanity check: scan for RCD command in extended SenseID data
 917          * some devices do not support RCD
 918          */
 919         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 920         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
 921                 return -EOPNOTSUPP;
 922
 923         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
 924         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 925         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
 926         cqr->retries = 5;
 927         cqr->callback = read_conf_cb;
 928         rc = dasd_sleep_on_immediatly(cqr);
 929         return rc;
 930 }
 931
 932 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 933                                    void **rcd_buffer,
 934                                    int *rcd_buffer_size, __u8 lpm)
 935 {
 936         struct ciw *ciw;
 937         char *rcd_buf = NULL;
 938         int ret;
 939         struct dasd_ccw_req *cqr;
 940
 941         /*
 942          * sanity check: scan for RCD command in extended SenseID data
 943          * some devices do not support RCD
 944          */
 945         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 946         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
 947                 ret = -EOPNOTSUPP;
 948                 goto out_error;
 949         }
 950         rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
 951         if (!rcd_buf) {
 952                 ret = -ENOMEM;
 953                 goto out_error;
 954         }
 955         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
 956                                    0, /* use rcd_buf as data ara */
 957                                    device);
 958         if (IS_ERR(cqr)) {
 959                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 960                               "Could not allocate RCD request");
 961                 ret = -ENOMEM;
 962                 goto out_error;
 963         }
 964         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
 965         cqr->callback = read_conf_cb;
 966         ret = dasd_sleep_on(cqr);
 967         /*
 968          * on success we update the user input parms
 969          */
 970         dasd_sfree_request(cqr, cqr->memdev);
 971         if (ret)
 972                 goto out_error;
 973
 974         *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
 975         *rcd_buffer = rcd_buf;
 976         return 0;
 977 out_error:
 978         kfree(rcd_buf);
 979         *rcd_buffer = NULL;
 980         *rcd_buffer_size = 0;
 981         return ret;
 982 }
 983
 984 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
 985 {
 986
 987         struct dasd_sneq *sneq;
 988         int i, count;
 989
 990         private->ned = NULL;
 991         private->sneq = NULL;
 992         private->vdsneq = NULL;
 993         private->gneq = NULL;
 994         count = private->conf_len / sizeof(struct dasd_sneq);
 995         sneq = (struct dasd_sneq *)private->conf_data;
 996         for (i = 0; i < count; ++i) {
 997                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 998                         private->sneq = sneq;
 999                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
1000                         private->vdsneq = (struct vd_sneq *)sneq;
1001                 else if (sneq->flags.identifier == 2)
1002                         private->gneq = (struct dasd_gneq *)sneq;
1003                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
1004                         private->ned = (struct dasd_ned *)sneq;
1005                 sneq++;
1006         }
1007         if (!private->ned || !private->gneq) {
1008                 private->ned = NULL;
1009                 private->sneq = NULL;
1010                 private->vdsneq = NULL;
1011                 private->gneq = NULL;
1012                 return -EINVAL;
1013         }
1014         return 0;
1015
1016 };
1017
1018 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
1019 {
1020         struct dasd_gneq *gneq;
1021         int i, count, found;
1022
1023         count = conf_len / sizeof(*gneq);
1024         gneq = (struct dasd_gneq *)conf_data;
1025         found = 0;
1026         for (i = 0; i < count; ++i) {
1027                 if (gneq->flags.identifier == 2) {
1028                         found = 1;
1029                         break;
1030                 }
1031                 gneq++;
1032         }
1033         if (found)
1034                 return ((char *)gneq)[18] & 0x07;
1035         else
1036                 return 0;
1037 }
1038
1039 static void dasd_eckd_clear_conf_data(struct dasd_device *device)
1040 {
1041         struct dasd_eckd_private *private = device->private;
1042         int i;
1043
1044         private->conf_data = NULL;
1045         private->conf_len = 0;
1046         for (i = 0; i < 8; i++) {
1047                 kfree(private->path_conf_data[i]);
1048                 private->path_conf_data[i] = NULL;
1049         }
1050 }
1051
1052
1053 static int dasd_eckd_read_conf(struct dasd_device *device)
1054 {
1055         void *conf_data;
1056         int conf_len, conf_data_saved;
1057         int rc, path_err, pos;
1058         __u8 lpm, opm;
1059         struct dasd_eckd_private *private, path_private;
1060         struct dasd_path *path_data;
1061         struct dasd_uid *uid;
1062         char print_path_uid[60], print_device_uid[60];
1063
1064         private = device->private;
1065         path_data = &device->path_data;
1066         opm = ccw_device_get_path_mask(device->cdev);
1067         conf_data_saved = 0;
1068         path_err = 0;
1069         /* get configuration data per operational path */
1070         for (lpm = 0x80; lpm; lpm>>= 1) {
1071                 if (!(lpm & opm))
1072                         continue;
1073                 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1074                                              &conf_len, lpm);
1075                 if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
1076                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1077                                         "Read configuration data returned "
1078                                         "error %d", rc);
1079                         return rc;
1080                 }
1081                 if (conf_data == NULL) {
1082                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1083                                         "No configuration data "
1084                                         "retrieved");
1085                         /* no further analysis possible */
1086                         path_data->opm |= lpm;
1087                         continue;       /* no error */
1088                 }
1089                 /* save first valid configuration data */
1090                 if (!conf_data_saved) {
1091                         /* initially clear previously stored conf_data */
1092                         dasd_eckd_clear_conf_data(device);
1093                         private->conf_data = conf_data;
1094                         private->conf_len = conf_len;
1095                         if (dasd_eckd_identify_conf_parts(private)) {
1096                                 private->conf_data = NULL;
1097                                 private->conf_len = 0;
1098                                 kfree(conf_data);
1099                                 continue;
1100                         }
1101                         pos = pathmask_to_pos(lpm);
1102                         /* store per path conf_data */
1103                         private->path_conf_data[pos] =
1104                                 (struct dasd_conf_data *) conf_data;
1105                         /*
1106                          * build device UID that other path data
1107                          * can be compared to it
1108                          */
1109                         dasd_eckd_generate_uid(device);
1110                         conf_data_saved++;
1111                 } else {
1112                         path_private.conf_data = conf_data;
1113                         path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1114                         if (dasd_eckd_identify_conf_parts(
1115                                     &path_private)) {
1116                                 path_private.conf_data = NULL;
1117                                 path_private.conf_len = 0;
1118                                 kfree(conf_data);
1119                                 continue;
1120                         }
1121                         if (dasd_eckd_compare_path_uid(
1122                                     device, &path_private)) {
1123                                 uid = &path_private.uid;
1124                                 if (strlen(uid->vduit) > 0)
1125                                         snprintf(print_path_uid,
1126                                                  sizeof(print_path_uid),
1127                                                  "%s.%s.%04x.%02x.%s",
1128                                                  uid->vendor, uid->serial,
1129                                                  uid->ssid, uid->real_unit_addr,
1130                                                  uid->vduit);
1131                                 else
1132                                         snprintf(print_path_uid,
1133                                                  sizeof(print_path_uid),
1134                                                  "%s.%s.%04x.%02x",
1135                                                  uid->vendor, uid->serial,
1136                                                  uid->ssid,
1137                                                  uid->real_unit_addr);
1138                                 uid = &private->uid;
1139                                 if (strlen(uid->vduit) > 0)
1140                                         snprintf(print_device_uid,
1141                                                  sizeof(print_device_uid),
1142                                                  "%s.%s.%04x.%02x.%s",
1143                                                  uid->vendor, uid->serial,
1144                                                  uid->ssid, uid->real_unit_addr,
1145                                                  uid->vduit);
1146                                 else
1147                                         snprintf(print_device_uid,
1148                                                  sizeof(print_device_uid),
1149                                                  "%s.%s.%04x.%02x",
1150                                                  uid->vendor, uid->serial,
1151                                                  uid->ssid,
1152                                                  uid->real_unit_addr);
1153                                 dev_err(&device->cdev->dev,
1154                                         "Not all channel paths lead to "
1155                                         "the same device, path %02X leads to "
1156                                         "device %s instead of %s\n", lpm,
1157                                         print_path_uid, print_device_uid);
1158                                 path_err = -EINVAL;
1159                                 path_data->cablepm |= lpm;
1160                                 continue;
1161                         }
1162                         pos = pathmask_to_pos(lpm);
1163                         /* store per path conf_data */
1164                         private->path_conf_data[pos] =
1165                                 (struct dasd_conf_data *) conf_data;
1166                         path_private.conf_data = NULL;
1167                         path_private.conf_len = 0;
1168                 }
1169                 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1170                 case 0x02:
1171                         path_data->npm |= lpm;
1172                         break;
1173                 case 0x03:
1174                         path_data->ppm |= lpm;
1175                         break;
1176                 }
1177                 if (!path_data->opm) {
1178                         path_data->opm = lpm;
1179                         dasd_generic_path_operational(device);
1180                 } else {
1181                         path_data->opm |= lpm;
1182                 }
1183                 /*
1184                  * if the path is used
1185                  * it should not be in one of the negative lists
1186                  */
1187                 path_data->cablepm &= ~lpm;
1188                 path_data->hpfpm &= ~lpm;
1189                 path_data->cuirpm &= ~lpm;
1190         }
1191
1192         return path_err;
1193 }
1194
1195 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1196 {
1197         struct dasd_eckd_private *private = device->private;
1198         int mdc;
1199         u32 fcx_max_data;
1200
1201         if (private->fcx_max_data) {
1202                 mdc = ccw_device_get_mdc(device->cdev, lpm);
1203                 if ((mdc < 0)) {
1204                         dev_warn(&device->cdev->dev,
1205                                  "Detecting the maximum data size for zHPF "
1206                                  "requests failed (rc=%d) for a new path %x\n",
1207                                  mdc, lpm);
1208                         return mdc;
1209                 }
1210                 fcx_max_data = (u32)mdc * FCX_MAX_DATA_FACTOR;
1211                 if (fcx_max_data < private->fcx_max_data) {
1212                         dev_warn(&device->cdev->dev,
1213                                  "The maximum data size for zHPF requests %u "
1214                                  "on a new path %x is below the active maximum "
1215                                  "%u\n", fcx_max_data, lpm,
1216                                  private->fcx_max_data);
1217                         return -EACCES;
1218                 }
1219         }
1220         return 0;
1221 }
1222
1223 static int rebuild_device_uid(struct dasd_device *device,
1224                               struct path_verification_work_data *data)
1225 {
1226         struct dasd_eckd_private *private = device->private;
1227         struct dasd_path *path_data = &device->path_data;
1228         __u8 lpm, opm = path_data->opm;
1229         int rc = -ENODEV;
1230
1231         for (lpm = 0x80; lpm; lpm >>= 1) {
1232                 if (!(lpm & opm))
1233                         continue;
1234                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1235                 memset(&data->cqr, 0, sizeof(data->cqr));
1236                 data->cqr.cpaddr = &data->ccw;
1237                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1238                                                      data->rcd_buffer,
1239                                                      lpm);
1240
1241                 if (rc) {
1242                         if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1243                                 continue;
1244                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1245                                         "Read configuration data "
1246                                         "returned error %d", rc);
1247                         break;
1248                 }
1249                 memcpy(private->conf_data, data->rcd_buffer,
1250                        DASD_ECKD_RCD_DATA_SIZE);
1251                 if (dasd_eckd_identify_conf_parts(private)) {
1252                         rc = -ENODEV;
1253                 } else /* first valid path is enough */
1254                         break;
1255         }
1256
1257         if (!rc)
1258                 rc = dasd_eckd_generate_uid(device);
1259
1260         return rc;
1261 }
1262
1263 static void do_path_verification_work(struct work_struct *work)
1264 {
1265         struct path_verification_work_data *data;
1266         struct dasd_device *device;
1267         struct dasd_eckd_private path_private;
1268         struct dasd_uid *uid;
1269         __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1270         __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
1271         unsigned long flags;
1272         char print_uid[60];
1273         int rc;
1274
1275         data = container_of(work, struct path_verification_work_data, worker);
1276         device = data->device;
1277
1278         /* delay path verification until device was resumed */
1279         if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1280                 schedule_work(work);
1281                 return;
1282         }
1283         /* check if path verification already running and delay if so */
1284         if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
1285                 schedule_work(work);
1286                 return;
1287         }
1288         opm = 0;
1289         npm = 0;
1290         ppm = 0;
1291         epm = 0;
1292         hpfpm = 0;
1293         cablepm = 0;
1294
1295         for (lpm = 0x80; lpm; lpm >>= 1) {
1296                 if (!(lpm & data->tbvpm))
1297                         continue;
1298                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1299                 memset(&data->cqr, 0, sizeof(data->cqr));
1300                 data->cqr.cpaddr = &data->ccw;
1301                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1302                                                      data->rcd_buffer,
1303                                                      lpm);
1304                 if (!rc) {
1305                         switch (dasd_eckd_path_access(data->rcd_buffer,
1306                                                       DASD_ECKD_RCD_DATA_SIZE)
1307                                 ) {
1308                         case 0x02:
1309                                 npm |= lpm;
1310                                 break;
1311                         case 0x03:
1312                                 ppm |= lpm;
1313                                 break;
1314                         }
1315                         opm |= lpm;
1316                 } else if (rc == -EOPNOTSUPP) {
1317                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1318                                         "path verification: No configuration "
1319                                         "data retrieved");
1320                         opm |= lpm;
1321                 } else if (rc == -EAGAIN) {
1322                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1323                                         "path verification: device is stopped,"
1324                                         " try again later");
1325                         epm |= lpm;
1326                 } else {
1327                         dev_warn(&device->cdev->dev,
1328                                  "Reading device feature codes failed "
1329                                  "(rc=%d) for new path %x\n", rc, lpm);
1330                         continue;
1331                 }
1332                 if (verify_fcx_max_data(device, lpm)) {
1333                         opm &= ~lpm;
1334                         npm &= ~lpm;
1335                         ppm &= ~lpm;
1336                         hpfpm |= lpm;
1337                         continue;
1338                 }
1339
1340                 /*
1341                  * save conf_data for comparison after
1342                  * rebuild_device_uid may have changed
1343                  * the original data
1344                  */
1345                 memcpy(&path_rcd_buf, data->rcd_buffer,
1346                        DASD_ECKD_RCD_DATA_SIZE);
1347                 path_private.conf_data = (void *) &path_rcd_buf;
1348                 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1349                 if (dasd_eckd_identify_conf_parts(&path_private)) {
1350                         path_private.conf_data = NULL;
1351                         path_private.conf_len = 0;
1352                         continue;
1353                 }
1354
1355                 /*
1356                  * compare path UID with device UID only if at least
1357                  * one valid path is left
1358                  * in other case the device UID may have changed and
1359                  * the first working path UID will be used as device UID
1360                  */
1361                 if (device->path_data.opm &&
1362                     dasd_eckd_compare_path_uid(device, &path_private)) {
1363                         /*
1364                          * the comparison was not successful
1365                          * rebuild the device UID with at least one
1366                          * known path in case a z/VM hyperswap command
1367                          * has changed the device
1368                          *
1369                          * after this compare again
1370                          *
1371                          * if either the rebuild or the recompare fails
1372                          * the path can not be used
1373                          */
1374                         if (rebuild_device_uid(device, data) ||
1375                             dasd_eckd_compare_path_uid(
1376                                     device, &path_private)) {
1377                                 uid = &path_private.uid;
1378                                 if (strlen(uid->vduit) > 0)
1379                                         snprintf(print_uid, sizeof(print_uid),
1380                                                  "%s.%s.%04x.%02x.%s",
1381                                                  uid->vendor, uid->serial,
1382                                                  uid->ssid, uid->real_unit_addr,
1383                                                  uid->vduit);
1384                                 else
1385                                         snprintf(print_uid, sizeof(print_uid),
1386                                                  "%s.%s.%04x.%02x",
1387                                                  uid->vendor, uid->serial,
1388                                                  uid->ssid,
1389                                                  uid->real_unit_addr);
1390                                 dev_err(&device->cdev->dev,
1391                                         "The newly added channel path %02X "
1392                                         "will not be used because it leads "
1393                                         "to a different device %s\n",
1394                                         lpm, print_uid);
1395                                 opm &= ~lpm;
1396                                 npm &= ~lpm;
1397                                 ppm &= ~lpm;
1398                                 cablepm |= lpm;
1399                                 continue;
1400                         }
1401                 }
1402
1403                 /*
1404                  * There is a small chance that a path is lost again between
1405                  * above path verification and the following modification of
1406                  * the device opm mask. We could avoid that race here by using
1407                  * yet another path mask, but we rather deal with this unlikely
1408                  * situation in dasd_start_IO.
1409                  */
1410                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1411                 if (!device->path_data.opm && opm) {
1412                         device->path_data.opm = opm;
1413                         device->path_data.cablepm &= ~opm;
1414                         device->path_data.cuirpm &= ~opm;
1415                         device->path_data.hpfpm &= ~opm;
1416                         dasd_generic_path_operational(device);
1417                 } else {
1418                         device->path_data.opm |= opm;
1419                         device->path_data.cablepm &= ~opm;
1420                         device->path_data.cuirpm &= ~opm;
1421                         device->path_data.hpfpm &= ~opm;
1422                 }
1423                 device->path_data.npm |= npm;
1424                 device->path_data.ppm |= ppm;
1425                 device->path_data.tbvpm |= epm;
1426                 device->path_data.cablepm |= cablepm;
1427                 device->path_data.hpfpm |= hpfpm;
1428                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1429         }
1430         clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
1431         dasd_put_device(device);
1432         if (data->isglobal)
1433                 mutex_unlock(&dasd_path_verification_mutex);
1434         else
1435                 kfree(data);
1436 }
1437
1438 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1439 {
1440         struct path_verification_work_data *data;
1441
1442         data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1443         if (!data) {
1444                 if (mutex_trylock(&dasd_path_verification_mutex)) {
1445                         data = path_verification_worker;
1446                         data->isglobal = 1;
1447                 } else
1448                         return -ENOMEM;
1449         } else {
1450                 memset(data, 0, sizeof(*data));
1451                 data->isglobal = 0;
1452         }
1453         INIT_WORK(&data->worker, do_path_verification_work);
1454         dasd_get_device(device);
1455         data->device = device;
1456         data->tbvpm = lpm;
1457         schedule_work(&data->worker);
1458         return 0;
1459 }
1460
1461 static int dasd_eckd_read_features(struct dasd_device *device)
1462 {
1463         struct dasd_eckd_private *private = device->private;
1464         struct dasd_psf_prssd_data *prssdp;
1465         struct dasd_rssd_features *features;
1466         struct dasd_ccw_req *cqr;
1467         struct ccw1 *ccw;
1468         int rc;
1469
1470         memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1471         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1472                                    (sizeof(struct dasd_psf_prssd_data) +
1473                                     sizeof(struct dasd_rssd_features)),
1474                                    device);
1475         if (IS_ERR(cqr)) {
1476                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1477                                 "allocate initialization request");
1478                 return PTR_ERR(cqr);
1479         }
1480         cqr->startdev = device;
1481         cqr->memdev = device;
1482         cqr->block = NULL;
1483         cqr->retries = 256;
1484         cqr->expires = 10 * HZ;
1485
1486         /* Prepare for Read Subsystem Data */
1487         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1488         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1489         prssdp->order = PSF_ORDER_PRSSD;
1490         prssdp->suborder = 0x41;        /* Read Feature Codes */
1491         /* all other bytes of prssdp must be zero */
1492
1493         ccw = cqr->cpaddr;
1494         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1495         ccw->count = sizeof(struct dasd_psf_prssd_data);
1496         ccw->flags |= CCW_FLAG_CC;
1497         ccw->cda = (__u32)(addr_t) prssdp;
1498
1499         /* Read Subsystem Data - feature codes */
1500         features = (struct dasd_rssd_features *) (prssdp + 1);
1501         memset(features, 0, sizeof(struct dasd_rssd_features));
1502
1503         ccw++;
1504         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1505         ccw->count = sizeof(struct dasd_rssd_features);
1506         ccw->cda = (__u32)(addr_t) features;
1507
1508         cqr->buildclk = get_tod_clock();
1509         cqr->status = DASD_CQR_FILLED;
1510         rc = dasd_sleep_on(cqr);
1511         if (rc == 0) {
1512                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1513                 features = (struct dasd_rssd_features *) (prssdp + 1);
1514                 memcpy(&private->features, features,
1515                        sizeof(struct dasd_rssd_features));
1516         } else
1517                 dev_warn(&device->cdev->dev, "Reading device feature codes"
1518                          " failed with rc=%d\n", rc);
1519         dasd_sfree_request(cqr, cqr->memdev);
1520         return rc;
1521 }
1522
1523
1524 /*
1525  * Build CP for Perform Subsystem Function - SSC.
1526  */
1527 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1528                                                     int enable_pav)
1529 {
1530         struct dasd_ccw_req *cqr;
1531         struct dasd_psf_ssc_data *psf_ssc_data;
1532         struct ccw1 *ccw;
1533
1534         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1535                                   sizeof(struct dasd_psf_ssc_data),
1536                                   device);
1537
1538         if (IS_ERR(cqr)) {
1539                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1540                            "Could not allocate PSF-SSC request");
1541                 return cqr;
1542         }
1543         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1544         psf_ssc_data->order = PSF_ORDER_SSC;
1545         psf_ssc_data->suborder = 0xc0;
1546         if (enable_pav) {
1547                 psf_ssc_data->suborder |= 0x08;
1548                 psf_ssc_data->reserved[0] = 0x88;
1549         }
1550         ccw = cqr->cpaddr;
1551         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1552         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1553         ccw->count = 66;
1554
1555         cqr->startdev = device;
1556         cqr->memdev = device;
1557         cqr->block = NULL;
1558         cqr->retries = 256;
1559         cqr->expires = 10*HZ;
1560         cqr->buildclk = get_tod_clock();
1561         cqr->status = DASD_CQR_FILLED;
1562         return cqr;
1563 }
1564
1565 /*
1566  * Perform Subsystem Function.
1567  * It is necessary to trigger CIO for channel revalidation since this
1568  * call might change behaviour of DASD devices.
1569  */
1570 static int
1571 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1572                   unsigned long flags)
1573 {
1574         struct dasd_ccw_req *cqr;
1575         int rc;
1576
1577         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1578         if (IS_ERR(cqr))
1579                 return PTR_ERR(cqr);
1580
1581         /*
1582          * set flags e.g. turn on failfast, to prevent blocking
1583          * the calling function should handle failed requests
1584          */
1585         cqr->flags |= flags;
1586
1587         rc = dasd_sleep_on(cqr);
1588         if (!rc)
1589                 /* trigger CIO to reprobe devices */
1590                 css_schedule_reprobe();
1591         else if (cqr->intrc == -EAGAIN)
1592                 rc = -EAGAIN;
1593
1594         dasd_sfree_request(cqr, cqr->memdev);
1595         return rc;
1596 }
1597
1598 /*
1599  * Valide storage server of current device.
1600  */
1601 static int dasd_eckd_validate_server(struct dasd_device *device,
1602                                      unsigned long flags)
1603 {
1604         struct dasd_eckd_private *private = device->private;
1605         int enable_pav, rc;
1606
1607         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1608             private->uid.type == UA_HYPER_PAV_ALIAS)
1609                 return 0;
1610         if (dasd_nopav || MACHINE_IS_VM)
1611                 enable_pav = 0;
1612         else
1613                 enable_pav = 1;
1614         rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1615
1616         /* may be requested feature is not available on server,
1617          * therefore just report error and go ahead */
1618         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1619                         "returned rc=%d", private->uid.ssid, rc);
1620         return rc;
1621 }
1622
1623 /*
1624  * worker to do a validate server in case of a lost pathgroup
1625  */
1626 static void dasd_eckd_do_validate_server(struct work_struct *work)
1627 {
1628         struct dasd_device *device = container_of(work, struct dasd_device,
1629                                                   kick_validate);
1630         unsigned long flags = 0;
1631
1632         set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1633         if (dasd_eckd_validate_server(device, flags)
1634             == -EAGAIN) {
1635                 /* schedule worker again if failed */
1636                 schedule_work(&device->kick_validate);
1637                 return;
1638         }
1639
1640         dasd_put_device(device);
1641 }
1642
1643 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1644 {
1645         dasd_get_device(device);
1646         /* exit if device not online or in offline processing */
1647         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1648            device->state < DASD_STATE_ONLINE) {
1649                 dasd_put_device(device);
1650                 return;
1651         }
1652         /* queue call to do_validate_server to the kernel event daemon. */
1653         if (!schedule_work(&device->kick_validate))
1654                 dasd_put_device(device);
1655 }
1656
1657 static u32 get_fcx_max_data(struct dasd_device *device)
1658 {
1659         struct dasd_eckd_private *private = device->private;
1660         int fcx_in_css, fcx_in_gneq, fcx_in_features;
1661         int tpm, mdc;
1662
1663         if (dasd_nofcx)
1664                 return 0;
1665         /* is transport mode supported? */
1666         fcx_in_css = css_general_characteristics.fcx;
1667         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1668         fcx_in_features = private->features.feature[40] & 0x80;
1669         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1670
1671         if (!tpm)
1672                 return 0;
1673
1674         mdc = ccw_device_get_mdc(device->cdev, 0);
1675         if (mdc < 0) {
1676                 dev_warn(&device->cdev->dev, "Detecting the maximum supported"
1677                          " data size for zHPF requests failed\n");
1678                 return 0;
1679         } else
1680                 return (u32)mdc * FCX_MAX_DATA_FACTOR;
1681 }
1682
1683 /*
1684  * Check device characteristics.
1685  * If the device is accessible using ECKD discipline, the device is enabled.
1686  */
1687 static int
1688 dasd_eckd_check_characteristics(struct dasd_device *device)
1689 {
1690         struct dasd_eckd_private *private = device->private;
1691         struct dasd_block *block;
1692         struct dasd_uid temp_uid;
1693         int rc, i;
1694         int readonly;
1695         unsigned long value;
1696
1697         /* setup work queue for validate server*/
1698         INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1699         /* setup work queue for summary unit check */
1700         INIT_WORK(&device->suc_work, dasd_alias_handle_summary_unit_check);
1701
1702         if (!ccw_device_is_pathgroup(device->cdev)) {
1703                 dev_warn(&device->cdev->dev,
1704                          "A channel path group could not be established\n");
1705                 return -EIO;
1706         }
1707         if (!ccw_device_is_multipath(device->cdev)) {
1708                 dev_info(&device->cdev->dev,
1709                          "The DASD is not operating in multipath mode\n");
1710         }
1711         if (!private) {
1712                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1713                 if (!private) {
1714                         dev_warn(&device->cdev->dev,
1715                                  "Allocating memory for private DASD data "
1716                                  "failed\n");
1717                         return -ENOMEM;
1718                 }
1719                 device->private = private;
1720         } else {
1721                 memset(private, 0, sizeof(*private));
1722         }
1723         /* Invalidate status of initial analysis. */
1724         private->init_cqr_status = -1;
1725         /* Set default cache operations. */
1726         private->attrib.operation = DASD_NORMAL_CACHE;
1727         private->attrib.nr_cyl = 0;
1728
1729         /* Read Configuration Data */
1730         rc = dasd_eckd_read_conf(device);
1731         if (rc)
1732                 goto out_err1;
1733
1734         /* set default timeout */
1735         device->default_expires = DASD_EXPIRES;
1736         /* set default retry count */
1737         device->default_retries = DASD_RETRIES;
1738
1739         if (private->gneq) {
1740                 value = 1;
1741                 for (i = 0; i < private->gneq->timeout.value; i++)
1742                         value = 10 * value;
1743                 value = value * private->gneq->timeout.number;
1744                 /* do not accept useless values */
1745                 if (value != 0 && value <= DASD_EXPIRES_MAX)
1746                         device->default_expires = value;
1747         }
1748
1749         dasd_eckd_get_uid(device, &temp_uid);
1750         if (temp_uid.type == UA_BASE_DEVICE) {
1751                 block = dasd_alloc_block();
1752                 if (IS_ERR(block)) {
1753                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1754                                         "could not allocate dasd "
1755                                         "block structure");
1756                         rc = PTR_ERR(block);
1757                         goto out_err1;
1758                 }
1759                 device->block = block;
1760                 block->base = device;
1761         }
1762
1763         /* register lcu with alias handling, enable PAV */
1764         rc = dasd_alias_make_device_known_to_lcu(device);
1765         if (rc)
1766                 goto out_err2;
1767
1768         dasd_eckd_validate_server(device, 0);
1769
1770         /* device may report different configuration data after LCU setup */
1771         rc = dasd_eckd_read_conf(device);
1772         if (rc)
1773                 goto out_err3;
1774
1775         /* Read Feature Codes */
1776         dasd_eckd_read_features(device);
1777
1778         /* Read Device Characteristics */
1779         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1780                                          &private->rdc_data, 64);
1781         if (rc) {
1782                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1783                                 "Read device characteristic failed, rc=%d", rc);
1784                 goto out_err3;
1785         }
1786
1787         if ((device->features & DASD_FEATURE_USERAW) &&
1788             !(private->rdc_data.facilities.RT_in_LR)) {
1789                 dev_err(&device->cdev->dev, "The storage server does not "
1790                         "support raw-track access\n");
1791                 rc = -EINVAL;
1792                 goto out_err3;
1793         }
1794
1795         /* find the valid cylinder size */
1796         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1797             private->rdc_data.long_no_cyl)
1798                 private->real_cyl = private->rdc_data.long_no_cyl;
1799         else
1800                 private->real_cyl = private->rdc_data.no_cyl;
1801
1802         private->fcx_max_data = get_fcx_max_data(device);
1803
1804         readonly = dasd_device_is_ro(device);
1805         if (readonly)
1806                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1807
1808         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1809                  "with %d cylinders, %d heads, %d sectors%s\n",
1810                  private->rdc_data.dev_type,
1811                  private->rdc_data.dev_model,
1812                  private->rdc_data.cu_type,
1813                  private->rdc_data.cu_model.model,
1814                  private->real_cyl,
1815                  private->rdc_data.trk_per_cyl,
1816                  private->rdc_data.sec_per_trk,
1817                  readonly ? ", read-only device" : "");
1818         return 0;
1819
1820 out_err3:
1821         dasd_alias_disconnect_device_from_lcu(device);
1822 out_err2:
1823         dasd_free_block(device->block);
1824         device->block = NULL;
1825 out_err1:
1826         kfree(private->conf_data);
1827         kfree(device->private);
1828         device->private = NULL;
1829         return rc;
1830 }
1831
1832 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1833 {
1834         struct dasd_eckd_private *private = device->private;
1835         int i;
1836
1837         if (!private)
1838                 return;
1839
1840         dasd_alias_disconnect_device_from_lcu(device);
1841         private->ned = NULL;
1842         private->sneq = NULL;
1843         private->vdsneq = NULL;
1844         private->gneq = NULL;
1845         private->conf_len = 0;
1846         for (i = 0; i < 8; i++) {
1847                 kfree(private->path_conf_data[i]);
1848                 if ((__u8 *)private->path_conf_data[i] ==
1849                     private->conf_data) {
1850                         private->conf_data = NULL;
1851                         private->conf_len = 0;
1852                 }
1853                 private->path_conf_data[i] = NULL;
1854         }
1855         kfree(private->conf_data);
1856         private->conf_data = NULL;
1857 }
1858
1859 static struct dasd_ccw_req *
1860 dasd_eckd_analysis_ccw(struct dasd_device *device)
1861 {
1862         struct dasd_eckd_private *private = device->private;
1863         struct eckd_count *count_data;
1864         struct LO_eckd_data *LO_data;
1865         struct dasd_ccw_req *cqr;
1866         struct ccw1 *ccw;
1867         int cplength, datasize;
1868         int i;
1869
1870         cplength = 8;
1871         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1872         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1873         if (IS_ERR(cqr))
1874                 return cqr;
1875         ccw = cqr->cpaddr;
1876         /* Define extent for the first 3 tracks. */
1877         define_extent(ccw++, cqr->data, 0, 2,
1878                       DASD_ECKD_CCW_READ_COUNT, device);
1879         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1880         /* Locate record for the first 4 records on track 0. */
1881         ccw[-1].flags |= CCW_FLAG_CC;
1882         locate_record(ccw++, LO_data++, 0, 0, 4,
1883                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1884
1885         count_data = private->count_area;
1886         for (i = 0; i < 4; i++) {
1887                 ccw[-1].flags |= CCW_FLAG_CC;
1888                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1889                 ccw->flags = 0;
1890                 ccw->count = 8;
1891                 ccw->cda = (__u32)(addr_t) count_data;
1892                 ccw++;
1893                 count_data++;
1894         }
1895
1896         /* Locate record for the first record on track 2. */
1897         ccw[-1].flags |= CCW_FLAG_CC;
1898         locate_record(ccw++, LO_data++, 2, 0, 1,
1899                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1900         /* Read count ccw. */
1901         ccw[-1].flags |= CCW_FLAG_CC;
1902         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1903         ccw->flags = 0;
1904         ccw->count = 8;
1905         ccw->cda = (__u32)(addr_t) count_data;
1906
1907         cqr->block = NULL;
1908         cqr->startdev = device;
1909         cqr->memdev = device;
1910         cqr->retries = 255;
1911         cqr->buildclk = get_tod_clock();
1912         cqr->status = DASD_CQR_FILLED;
1913         return cqr;
1914 }
1915
1916 /* differentiate between 'no record found' and any other error */
1917 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1918 {
1919         char *sense;
1920         if (init_cqr->status == DASD_CQR_DONE)
1921                 return INIT_CQR_OK;
1922         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1923                  init_cqr->status == DASD_CQR_FAILED) {
1924                 sense = dasd_get_sense(&init_cqr->irb);
1925                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1926                         return INIT_CQR_UNFORMATTED;
1927                 else
1928                         return INIT_CQR_ERROR;
1929         } else
1930                 return INIT_CQR_ERROR;
1931 }
1932
1933 /*
1934  * This is the callback function for the init_analysis cqr. It saves
1935  * the status of the initial analysis ccw before it frees it and kicks
1936  * the device to continue the startup sequence. This will call
1937  * dasd_eckd_do_analysis again (if the devices has not been marked
1938  * for deletion in the meantime).
1939  */
1940 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1941                                         void *data)
1942 {
1943         struct dasd_device *device = init_cqr->startdev;
1944         struct dasd_eckd_private *private = device->private;
1945
1946         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1947         dasd_sfree_request(init_cqr, device);
1948         dasd_kick_device(device);
1949 }
1950
1951 static int dasd_eckd_start_analysis(struct dasd_block *block)
1952 {
1953         struct dasd_ccw_req *init_cqr;
1954
1955         init_cqr = dasd_eckd_analysis_ccw(block->base);
1956         if (IS_ERR(init_cqr))
1957                 return PTR_ERR(init_cqr);
1958         init_cqr->callback = dasd_eckd_analysis_callback;
1959         init_cqr->callback_data = NULL;
1960         init_cqr->expires = 5*HZ;
1961         /* first try without ERP, so we can later handle unformatted
1962          * devices as special case
1963          */
1964         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1965         init_cqr->retries = 0;
1966         dasd_add_request_head(init_cqr);
1967         return -EAGAIN;
1968 }
1969
1970 static int dasd_eckd_end_analysis(struct dasd_block *block)
1971 {
1972         struct dasd_device *device = block->base;
1973         struct dasd_eckd_private *private = device->private;
1974         struct eckd_count *count_area;
1975         unsigned int sb, blk_per_trk;
1976         int status, i;
1977         struct dasd_ccw_req *init_cqr;
1978
1979         status = private->init_cqr_status;
1980         private->init_cqr_status = -1;
1981         if (status == INIT_CQR_ERROR) {
1982                 /* try again, this time with full ERP */
1983                 init_cqr = dasd_eckd_analysis_ccw(device);
1984                 dasd_sleep_on(init_cqr);
1985                 status = dasd_eckd_analysis_evaluation(init_cqr);
1986                 dasd_sfree_request(init_cqr, device);
1987         }
1988
1989         if (device->features & DASD_FEATURE_USERAW) {
1990                 block->bp_block = DASD_RAW_BLOCKSIZE;
1991                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1992                 block->s2b_shift = 3;
1993                 goto raw;
1994         }
1995
1996         if (status == INIT_CQR_UNFORMATTED) {
1997                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1998                 return -EMEDIUMTYPE;
1999         } else if (status == INIT_CQR_ERROR) {
2000                 dev_err(&device->cdev->dev,
2001                         "Detecting the DASD disk layout failed because "
2002                         "of an I/O error\n");
2003                 return -EIO;
2004         }
2005
2006         private->uses_cdl = 1;
2007         /* Check Track 0 for Compatible Disk Layout */
2008         count_area = NULL;
2009         for (i = 0; i < 3; i++) {
2010                 if (private->count_area[i].kl != 4 ||
2011                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
2012                     private->count_area[i].cyl != 0 ||
2013                     private->count_area[i].head != count_area_head[i] ||
2014                     private->count_area[i].record != count_area_rec[i]) {
2015                         private->uses_cdl = 0;
2016                         break;
2017                 }
2018         }
2019         if (i == 3)
2020                 count_area = &private->count_area[4];
2021
2022         if (private->uses_cdl == 0) {
2023                 for (i = 0; i < 5; i++) {
2024                         if ((private->count_area[i].kl != 0) ||
2025                             (private->count_area[i].dl !=
2026                              private->count_area[0].dl) ||
2027                             private->count_area[i].cyl !=  0 ||
2028                             private->count_area[i].head != count_area_head[i] ||
2029                             private->count_area[i].record != count_area_rec[i])
2030                                 break;
2031                 }
2032                 if (i == 5)
2033                         count_area = &private->count_area[0];
2034         } else {
2035                 if (private->count_area[3].record == 1)
2036                         dev_warn(&device->cdev->dev,
2037                                  "Track 0 has no records following the VTOC\n");
2038         }
2039
2040         if (count_area != NULL && count_area->kl == 0) {
2041                 /* we found notthing violating our disk layout */
2042                 if (dasd_check_blocksize(count_area->dl) == 0)
2043                         block->bp_block = count_area->dl;
2044         }
2045         if (block->bp_block == 0) {
2046                 dev_warn(&device->cdev->dev,
2047                          "The disk layout of the DASD is not supported\n");
2048                 return -EMEDIUMTYPE;
2049         }
2050         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
2051         for (sb = 512; sb < block->bp_block; sb = sb << 1)
2052                 block->s2b_shift++;
2053
2054         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2055
2056 raw:
2057         block->blocks = ((unsigned long) private->real_cyl *
2058                           private->rdc_data.trk_per_cyl *
2059                           blk_per_trk);
2060
2061         dev_info(&device->cdev->dev,
2062                  "DASD with %u KB/block, %lu KB total size, %u KB/track, "
2063                  "%s\n", (block->bp_block >> 10),
2064                  (((unsigned long) private->real_cyl *
2065                    private->rdc_data.trk_per_cyl *
2066                    blk_per_trk * (block->bp_block >> 9)) >> 1),
2067                  ((blk_per_trk * block->bp_block) >> 10),
2068                  private->uses_cdl ?
2069                  "compatible disk layout" : "linux disk layout");
2070
2071         return 0;
2072 }
2073
2074 static int dasd_eckd_do_analysis(struct dasd_block *block)
2075 {
2076         struct dasd_eckd_private *private = block->base->private;
2077
2078         if (private->init_cqr_status < 0)
2079                 return dasd_eckd_start_analysis(block);
2080         else
2081                 return dasd_eckd_end_analysis(block);
2082 }
2083
2084 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2085 {
2086         return dasd_alias_add_device(device);
2087 };
2088
2089 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2090 {
2091         if (cancel_work_sync(&device->reload_device))
2092                 dasd_put_device(device);
2093         if (cancel_work_sync(&device->kick_validate))
2094                 dasd_put_device(device);
2095
2096         return 0;
2097 };
2098
2099 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2100 {
2101         return dasd_alias_remove_device(device);
2102 };
2103
2104 static int
2105 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2106 {
2107         struct dasd_eckd_private *private = block->base->private;
2108
2109         if (dasd_check_blocksize(block->bp_block) == 0) {
2110                 geo->sectors = recs_per_track(&private->rdc_data,
2111                                               0, block->bp_block);
2112         }
2113         geo->cylinders = private->rdc_data.no_cyl;
2114         geo->heads = private->rdc_data.trk_per_cyl;
2115         return 0;
2116 }
2117
2118 /*
2119  * Build the TCW request for the format check
2120  */
2121 static struct dasd_ccw_req *
2122 dasd_eckd_build_check_tcw(struct dasd_device *base, struct format_data_t *fdata,
2123                           int enable_pav, struct eckd_count *fmt_buffer,
2124                           int rpt)
2125 {
2126         struct dasd_eckd_private *start_priv;
2127         struct dasd_device *startdev = NULL;
2128         struct tidaw *last_tidaw = NULL;
2129         struct dasd_ccw_req *cqr;
2130         struct itcw *itcw;
2131         int itcw_size;
2132         int count;
2133         int rc;
2134         int i;
2135
2136         if (enable_pav)
2137                 startdev = dasd_alias_get_start_dev(base);
2138
2139         if (!startdev)
2140                 startdev = base;
2141
2142         start_priv = startdev->private;
2143
2144         count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2145
2146         /*
2147          * we're adding 'count' amount of tidaw to the itcw.
2148          * calculate the corresponding itcw_size
2149          */
2150         itcw_size = itcw_calc_size(0, count, 0);
2151
2152         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2153         if (IS_ERR(cqr))
2154                 return cqr;
2155
2156         start_priv->count++;
2157
2158         itcw = itcw_init(cqr->data, itcw_size, ITCW_OP_READ, 0, count, 0);
2159         if (IS_ERR(itcw)) {
2160                 rc = -EINVAL;
2161                 goto out_err;
2162         }
2163
2164         cqr->cpaddr = itcw_get_tcw(itcw);
2165         rc = prepare_itcw(itcw, fdata->start_unit, fdata->stop_unit,
2166                           DASD_ECKD_CCW_READ_COUNT_MT, base, startdev, 0, count,
2167                           sizeof(struct eckd_count),
2168                           count * sizeof(struct eckd_count), 0, rpt);
2169         if (rc)
2170                 goto out_err;
2171
2172         for (i = 0; i < count; i++) {
2173                 last_tidaw = itcw_add_tidaw(itcw, 0, fmt_buffer++,
2174                                             sizeof(struct eckd_count));
2175                 if (IS_ERR(last_tidaw)) {
2176                         rc = -EINVAL;
2177                         goto out_err;
2178                 }
2179         }
2180
2181         last_tidaw->flags |= TIDAW_FLAGS_LAST;
2182         itcw_finalize(itcw);
2183
2184         cqr->cpmode = 1;
2185         cqr->startdev = startdev;
2186         cqr->memdev = startdev;
2187         cqr->basedev = base;
2188         cqr->retries = startdev->default_retries;
2189         cqr->expires = startdev->default_expires * HZ;
2190         cqr->buildclk = get_tod_clock();
2191         cqr->status = DASD_CQR_FILLED;
2192         /* Set flags to suppress output for expected errors */
2193         set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
2194         set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
2195
2196         return cqr;
2197
2198 out_err:
2199         dasd_sfree_request(cqr, startdev);
2200
2201         return ERR_PTR(rc);
2202 }
2203
2204 /*
2205  * Build the CCW request for the format check
2206  */
2207 static struct dasd_ccw_req *
2208 dasd_eckd_build_check(struct dasd_device *base, struct format_data_t *fdata,
2209                       int enable_pav, struct eckd_count *fmt_buffer, int rpt)
2210 {
2211         struct dasd_eckd_private *start_priv;
2212         struct dasd_eckd_private *base_priv;
2213         struct dasd_device *startdev = NULL;
2214         struct dasd_ccw_req *cqr;
2215         struct ccw1 *ccw;
2216         void *data;
2217         int cplength, datasize;
2218         int use_prefix;
2219         int count;
2220         int i;
2221
2222         if (enable_pav)
2223                 startdev = dasd_alias_get_start_dev(base);
2224
2225         if (!startdev)
2226                 startdev = base;
2227
2228         start_priv = startdev->private;
2229         base_priv = base->private;
2230
2231         count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2232
2233         use_prefix = base_priv->features.feature[8] & 0x01;
2234
2235         if (use_prefix) {
2236                 cplength = 1;
2237                 datasize = sizeof(struct PFX_eckd_data);
2238         } else {
2239                 cplength = 2;
2240                 datasize = sizeof(struct DE_eckd_data) +
2241                         sizeof(struct LO_eckd_data);
2242         }
2243         cplength += count;
2244
2245         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2246                                   startdev);
2247         if (IS_ERR(cqr))
2248                 return cqr;
2249
2250         start_priv->count++;
2251         data = cqr->data;
2252         ccw = cqr->cpaddr;
2253
2254         if (use_prefix) {
2255                 prefix_LRE(ccw++, data, fdata->start_unit, fdata->stop_unit,
2256                            DASD_ECKD_CCW_READ_COUNT, base, startdev, 1, 0,
2257                            count, 0, 0);
2258         } else {
2259                 define_extent(ccw++, data, fdata->start_unit, fdata->stop_unit,
2260                               DASD_ECKD_CCW_READ_COUNT, startdev);
2261
2262                 data += sizeof(struct DE_eckd_data);
2263                 ccw[-1].flags |= CCW_FLAG_CC;
2264
2265                 locate_record(ccw++, data, fdata->start_unit, 0, count,
2266                               DASD_ECKD_CCW_READ_COUNT, base, 0);
2267         }
2268
2269         for (i = 0; i < count; i++) {
2270                 ccw[-1].flags |= CCW_FLAG_CC;
2271                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2272                 ccw->flags = CCW_FLAG_SLI;
2273                 ccw->count = 8;
2274                 ccw->cda = (__u32)(addr_t) fmt_buffer;
2275                 ccw++;
2276                 fmt_buffer++;
2277         }
2278
2279         cqr->startdev = startdev;
2280         cqr->memdev = startdev;
2281         cqr->basedev = base;
2282         cqr->retries = DASD_RETRIES;
2283         cqr->expires = startdev->default_expires * HZ;
2284         cqr->buildclk = get_tod_clock();
2285         cqr->status = DASD_CQR_FILLED;
2286         /* Set flags to suppress output for expected errors */
2287         set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2288
2289         return cqr;
2290 }
2291
2292 static struct dasd_ccw_req *
2293 dasd_eckd_build_format(struct dasd_device *base,
2294                        struct format_data_t *fdata,
2295                        int enable_pav)
2296 {
2297         struct dasd_eckd_private *base_priv;
2298         struct dasd_eckd_private *start_priv;
2299         struct dasd_device *startdev = NULL;
2300         struct dasd_ccw_req *fcp;
2301         struct eckd_count *ect;
2302         struct ch_t address;
2303         struct ccw1 *ccw;
2304         void *data;
2305         int rpt;
2306         int cplength, datasize;
2307         int i, j;
2308         int intensity = 0;
2309         int r0_perm;
2310         int nr_tracks;
2311         int use_prefix;
2312
2313         if (enable_pav)
2314                 startdev = dasd_alias_get_start_dev(base);
2315
2316         if (!startdev)
2317                 startdev = base;
2318
2319         start_priv = startdev->private;
2320         base_priv = base->private;
2321
2322         rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2323
2324         nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2325
2326         /*
2327          * fdata->intensity is a bit string that tells us what to do:
2328          *   Bit 0: write record zero
2329          *   Bit 1: write home address, currently not supported
2330          *   Bit 2: invalidate tracks
2331          *   Bit 3: use OS/390 compatible disk layout (cdl)
2332          *   Bit 4: do not allow storage subsystem to modify record zero
2333          * Only some bit combinations do make sense.
2334          */
2335         if (fdata->intensity & 0x10) {
2336                 r0_perm = 0;
2337                 intensity = fdata->intensity & ~0x10;
2338         } else {
2339                 r0_perm = 1;
2340                 intensity = fdata->intensity;
2341         }
2342
2343         use_prefix = base_priv->features.feature[8] & 0x01;
2344
2345         switch (intensity) {
2346         case 0x00:      /* Normal format */
2347         case 0x08:      /* Normal format, use cdl. */
2348                 cplength = 2 + (rpt*nr_tracks);
2349                 if (use_prefix)
2350                         datasize = sizeof(struct PFX_eckd_data) +
2351                                 sizeof(struct LO_eckd_data) +
2352                                 rpt * nr_tracks * sizeof(struct eckd_count);
2353                 else
2354                         datasize = sizeof(struct DE_eckd_data) +
2355                                 sizeof(struct LO_eckd_data) +
2356                                 rpt * nr_tracks * sizeof(struct eckd_count);
2357                 break;
2358         case 0x01:      /* Write record zero and format track. */
2359         case 0x09:      /* Write record zero and format track, use cdl. */
2360                 cplength = 2 + rpt * nr_tracks;
2361                 if (use_prefix)
2362                         datasize = sizeof(struct PFX_eckd_data) +
2363                                 sizeof(struct LO_eckd_data) +
2364                                 sizeof(struct eckd_count) +
2365                                 rpt * nr_tracks * sizeof(struct eckd_count);
2366                 else
2367                         datasize = sizeof(struct DE_eckd_data) +
2368                                 sizeof(struct LO_eckd_data) +
2369                                 sizeof(struct eckd_count) +
2370                                 rpt * nr_tracks * sizeof(struct eckd_count);
2371                 break;
2372         case 0x04:      /* Invalidate track. */
2373         case 0x0c:      /* Invalidate track, use cdl. */
2374                 cplength = 3;
2375                 if (use_prefix)
2376                         datasize = sizeof(struct PFX_eckd_data) +
2377                                 sizeof(struct LO_eckd_data) +
2378                                 sizeof(struct eckd_count);
2379                 else
2380                         datasize = sizeof(struct DE_eckd_data) +
2381                                 sizeof(struct LO_eckd_data) +
2382                                 sizeof(struct eckd_count);
2383                 break;
2384         default:
2385                 dev_warn(&startdev->cdev->dev,
2386                          "An I/O control call used incorrect flags 0x%x\n",
2387                          fdata->intensity);
2388                 return ERR_PTR(-EINVAL);
2389         }
2390         /* Allocate the format ccw request. */
2391         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
2392                                    datasize, startdev);
2393         if (IS_ERR(fcp))
2394                 return fcp;
2395
2396         start_priv->count++;
2397         data = fcp->data;
2398         ccw = fcp->cpaddr;
2399
2400         switch (intensity & ~0x08) {
2401         case 0x00: /* Normal format. */
2402                 if (use_prefix) {
2403                         prefix(ccw++, (struct PFX_eckd_data *) data,
2404                                fdata->start_unit, fdata->stop_unit,
2405                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2406                         /* grant subsystem permission to format R0 */
2407                         if (r0_perm)
2408                                 ((struct PFX_eckd_data *)data)
2409                                         ->define_extent.ga_extended |= 0x04;
2410                         data += sizeof(struct PFX_eckd_data);
2411                 } else {
2412                         define_extent(ccw++, (struct DE_eckd_data *) data,
2413                                       fdata->start_unit, fdata->stop_unit,
2414                                       DASD_ECKD_CCW_WRITE_CKD, startdev);
2415                         /* grant subsystem permission to format R0 */
2416                         if (r0_perm)
2417                                 ((struct DE_eckd_data *) data)
2418                                         ->ga_extended |= 0x04;
2419                         data += sizeof(struct DE_eckd_data);
2420                 }
2421                 ccw[-1].flags |= CCW_FLAG_CC;
2422                 locate_record(ccw++, (struct LO_eckd_data *) data,
2423                               fdata->start_unit, 0, rpt*nr_tracks,
2424                               DASD_ECKD_CCW_WRITE_CKD, base,
2425                               fdata->blksize);
2426                 data += sizeof(struct LO_eckd_data);
2427                 break;
2428         case 0x01: /* Write record zero + format track. */
2429                 if (use_prefix) {
2430                         prefix(ccw++, (struct PFX_eckd_data *) data,
2431                                fdata->start_unit, fdata->stop_unit,
2432                                DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2433                                base, startdev);
2434                         data += sizeof(struct PFX_eckd_data);
2435                 } else {
2436                         define_extent(ccw++, (struct DE_eckd_data *) data,
2437                                fdata->start_unit, fdata->stop_unit,
2438                                DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev);
2439                         data += sizeof(struct DE_eckd_data);
2440                 }
2441                 ccw[-1].flags |= CCW_FLAG_CC;
2442                 locate_record(ccw++, (struct LO_eckd_data *) data,
2443                               fdata->start_unit, 0, rpt * nr_tracks + 1,
2444                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2445                               base->block->bp_block);
2446                 data += sizeof(struct LO_eckd_data);
2447                 break;
2448         case 0x04: /* Invalidate track. */
2449                 if (use_prefix) {
2450                         prefix(ccw++, (struct PFX_eckd_data *) data,
2451                                fdata->start_unit, fdata->stop_unit,
2452                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2453                         data += sizeof(struct PFX_eckd_data);
2454                 } else {
2455                         define_extent(ccw++, (struct DE_eckd_data *) data,
2456                                fdata->start_unit, fdata->stop_unit,
2457                                DASD_ECKD_CCW_WRITE_CKD, startdev);
2458                         data += sizeof(struct DE_eckd_data);
2459                 }
2460                 ccw[-1].flags |= CCW_FLAG_CC;
2461                 locate_record(ccw++, (struct LO_eckd_data *) data,
2462                               fdata->start_unit, 0, 1,
2463                               DASD_ECKD_CCW_WRITE_CKD, base, 8);
2464                 data += sizeof(struct LO_eckd_data);
2465                 break;
2466         }
2467
2468         for (j = 0; j < nr_tracks; j++) {
2469                 /* calculate cylinder and head for the current track */
2470                 set_ch_t(&address,
2471                          (fdata->start_unit + j) /
2472                          base_priv->rdc_data.trk_per_cyl,
2473                          (fdata->start_unit + j) %
2474                          base_priv->rdc_data.trk_per_cyl);
2475                 if (intensity & 0x01) { /* write record zero */
2476                         ect = (struct eckd_count *) data;
2477                         data += sizeof(struct eckd_count);
2478                         ect->cyl = address.cyl;
2479                         ect->head = address.head;
2480                         ect->record = 0;
2481                         ect->kl = 0;
2482                         ect->dl = 8;
2483                         ccw[-1].flags |= CCW_FLAG_CC;
2484                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2485                         ccw->flags = CCW_FLAG_SLI;
2486                         ccw->count = 8;
2487                         ccw->cda = (__u32)(addr_t) ect;
2488                         ccw++;
2489                 }
2490                 if ((intensity & ~0x08) & 0x04) {       /* erase track */
2491                         ect = (struct eckd_count *) data;
2492                         data += sizeof(struct eckd_count);
2493                         ect->cyl = address.cyl;
2494                         ect->head = address.head;
2495                         ect->record = 1;
2496                         ect->kl = 0;
2497                         ect->dl = 0;
2498                         ccw[-1].flags |= CCW_FLAG_CC;
2499                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2500                         ccw->flags = CCW_FLAG_SLI;
2501                         ccw->count = 8;
2502                         ccw->cda = (__u32)(addr_t) ect;
2503                 } else {                /* write remaining records */
2504                         for (i = 0; i < rpt; i++) {
2505                                 ect = (struct eckd_count *) data;
2506                                 data += sizeof(struct eckd_count);
2507                                 ect->cyl = address.cyl;
2508                                 ect->head = address.head;
2509                                 ect->record = i + 1;
2510                                 ect->kl = 0;
2511                                 ect->dl = fdata->blksize;
2512                                 /*
2513                                  * Check for special tracks 0-1
2514                                  * when formatting CDL
2515                                  */
2516                                 if ((intensity & 0x08) &&
2517                                     address.cyl == 0 && address.head == 0) {
2518                                         if (i < 3) {
2519                                                 ect->kl = 4;
2520                                                 ect->dl = sizes_trk0[i] - 4;
2521                                         }
2522                                 }
2523                                 if ((intensity & 0x08) &&
2524                                     address.cyl == 0 && address.head == 1) {
2525                                         ect->kl = 44;
2526                                         ect->dl = LABEL_SIZE - 44;
2527                                 }
2528                                 ccw[-1].flags |= CCW_FLAG_CC;
2529                                 if (i != 0 || j == 0)
2530                                         ccw->cmd_code =
2531                                                 DASD_ECKD_CCW_WRITE_CKD;
2532                                 else
2533                                         ccw->cmd_code =
2534                                                 DASD_ECKD_CCW_WRITE_CKD_MT;
2535                                 ccw->flags = CCW_FLAG_SLI;
2536                                 ccw->count = 8;
2537                                         ccw->cda = (__u32)(addr_t) ect;
2538                                         ccw++;
2539                         }
2540                 }
2541         }
2542
2543         fcp->startdev = startdev;
2544         fcp->memdev = startdev;
2545         fcp->basedev = base;
2546         fcp->retries = 256;
2547         fcp->expires = startdev->default_expires * HZ;
2548         fcp->buildclk = get_tod_clock();
2549         fcp->status = DASD_CQR_FILLED;
2550
2551         return fcp;
2552 }
2553
2554 /*
2555  * Wrapper function to build a CCW request depending on input data
2556  */
2557 static struct dasd_ccw_req *
2558 dasd_eckd_format_build_ccw_req(struct dasd_device *base,
2559                                struct format_data_t *fdata, int enable_pav,
2560                                int tpm, struct eckd_count *fmt_buffer, int rpt)
2561 {
2562         struct dasd_ccw_req *ccw_req;
2563
2564         if (!fmt_buffer) {
2565                 ccw_req = dasd_eckd_build_format(base, fdata, enable_pav);
2566         } else {
2567                 if (tpm)
2568                         ccw_req = dasd_eckd_build_check_tcw(base, fdata,
2569                                                             enable_pav,
2570                                                             fmt_buffer, rpt);
2571                 else
2572                         ccw_req = dasd_eckd_build_check(base, fdata, enable_pav,
2573                                                         fmt_buffer, rpt);
2574         }
2575
2576         return ccw_req;
2577 }
2578
2579 /*
2580  * Sanity checks on format_data
2581  */
2582 static int dasd_eckd_format_sanity_checks(struct dasd_device *base,
2583                                           struct format_data_t *fdata)
2584 {
2585         struct dasd_eckd_private *private = base->private;
2586
2587         if (fdata->start_unit >=
2588             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2589                 dev_warn(&base->cdev->dev,
2590                          "Start track number %u used in formatting is too big\n",
2591                          fdata->start_unit);
2592                 return -EINVAL;
2593         }
2594         if (fdata->stop_unit >=
2595             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2596                 dev_warn(&base->cdev->dev,
2597                          "Stop track number %u used in formatting is too big\n",
2598                          fdata->stop_unit);
2599                 return -EINVAL;
2600         }
2601         if (fdata->start_unit > fdata->stop_unit) {
2602                 dev_warn(&base->cdev->dev,
2603                          "Start track %u used in formatting exceeds end track\n",
2604                          fdata->start_unit);
2605                 return -EINVAL;
2606         }
2607         if (dasd_check_blocksize(fdata->blksize) != 0) {
2608                 dev_warn(&base->cdev->dev,
2609                          "The DASD cannot be formatted with block size %u\n",
2610                          fdata->blksize);
2611                 return -EINVAL;
2612         }
2613         return 0;
2614 }
2615
2616 /*
2617  * This function will process format_data originally coming from an IOCTL
2618  */
2619 static int dasd_eckd_format_process_data(struct dasd_device *base,
2620                                          struct format_data_t *fdata,
2621                                          int enable_pav, int tpm,
2622                                          struct eckd_count *fmt_buffer, int rpt,
2623                                          struct irb *irb)
2624 {
2625         struct dasd_eckd_private *private = base->private;
2626         struct dasd_ccw_req *cqr, *n;
2627         struct list_head format_queue;
2628         struct dasd_device *device;
2629         char *sense = NULL;
2630         int old_start, old_stop, format_step;
2631         int step, retry;
2632         int rc;
2633
2634         rc = dasd_eckd_format_sanity_checks(base, fdata);
2635         if (rc)
2636                 return rc;
2637
2638         INIT_LIST_HEAD(&format_queue);
2639
2640         old_start = fdata->start_unit;
2641         old_stop = fdata->stop_unit;
2642
2643         if (!tpm && fmt_buffer != NULL) {
2644                 /* Command Mode / Format Check */
2645                 format_step = 1;
2646         } else if (tpm && fmt_buffer != NULL) {
2647                 /* Transport Mode / Format Check */
2648                 format_step = DASD_CQR_MAX_CCW / rpt;
2649         } else {
2650                 /* Normal Formatting */
2651                 format_step = DASD_CQR_MAX_CCW /
2652                         recs_per_track(&private->rdc_data, 0, fdata->blksize);
2653         }
2654
2655         do {
2656                 retry = 0;
2657                 while (fdata->start_unit <= old_stop) {
2658                         step = fdata->stop_unit - fdata->start_unit + 1;
2659                         if (step > format_step) {
2660                                 fdata->stop_unit =
2661                                         fdata->start_unit + format_step - 1;
2662                         }
2663
2664                         cqr = dasd_eckd_format_build_ccw_req(base, fdata,
2665                                                              enable_pav, tpm,
2666                                                              fmt_buffer, rpt);
2667                         if (IS_ERR(cqr)) {
2668                                 rc = PTR_ERR(cqr);
2669                                 if (rc == -ENOMEM) {
2670                                         if (list_empty(&format_queue))
2671                                                 goto out;
2672                                         /*
2673                                          * not enough memory available, start
2674                                          * requests retry after first requests
2675                                          * were finished
2676                                          */
2677                                         retry = 1;
2678                                         break;
2679                                 }
2680                                 goto out_err;
2681                         }
2682                         list_add_tail(&cqr->blocklist, &format_queue);
2683
2684                         if (fmt_buffer) {
2685                                 step = fdata->stop_unit - fdata->start_unit + 1;
2686                                 fmt_buffer += rpt * step;
2687                         }
2688                         fdata->start_unit = fdata->stop_unit + 1;
2689                         fdata->stop_unit = old_stop;
2690                 }
2691
2692                 rc = dasd_sleep_on_queue(&format_queue);
2693
2694 out_err:
2695                 list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
2696                         device = cqr->startdev;
2697                         private = device->private;
2698
2699                         if (cqr->status == DASD_CQR_FAILED) {
2700                                 /*
2701                                  * Only get sense data if called by format
2702                                  * check
2703                                  */
2704                                 if (fmt_buffer && irb) {
2705                                         sense = dasd_get_sense(&cqr->irb);
2706                                         memcpy(irb, &cqr->irb, sizeof(*irb));
2707                                 }
2708                                 rc = -EIO;
2709                         }
2710                         list_del_init(&cqr->blocklist);
2711                         dasd_sfree_request(cqr, device);
2712                         private->count--;
2713                 }
2714
2715                 if (rc && rc != -EIO)
2716                         goto out;
2717                 if (rc == -EIO) {
2718                         /*
2719                          * In case fewer than the expected records are on the
2720                          * track, we will most likely get a 'No Record Found'
2721                          * error (in command mode) or a 'File Protected' error
2722                          * (in transport mode). Those particular cases shouldn't
2723                          * pass the -EIO to the IOCTL, therefore reset the rc
2724                          * and continue.
2725                          */
2726                         if (sense &&
2727                             (sense[1] & SNS1_NO_REC_FOUND ||
2728                              sense[1] & SNS1_FILE_PROTECTED))
2729                                 retry = 1;
2730                         else
2731                                 goto out;
2732                 }
2733
2734         } while (retry);
2735
2736 out:
2737         fdata->start_unit = old_start;
2738         fdata->stop_unit = old_stop;
2739
2740         return rc;
2741 }
2742
2743 static int dasd_eckd_format_device(struct dasd_device *base,
2744                                    struct format_data_t *fdata, int enable_pav)
2745 {
2746         return dasd_eckd_format_process_data(base, fdata, enable_pav, 0, NULL,
2747                                              0, NULL);
2748 }
2749
2750 /*
2751  * Helper function to count consecutive records of a single track.
2752  */
2753 static int dasd_eckd_count_records(struct eckd_count *fmt_buffer, int start,
2754                                    int max)
2755 {
2756         int head;
2757         int i;
2758
2759         head = fmt_buffer[start].head;
2760
2761         /*
2762          * There are 3 conditions where we stop counting:
2763          * - if data reoccurs (same head and record may reoccur), which may
2764          *   happen due to the way DASD_ECKD_CCW_READ_COUNT works
2765          * - when the head changes, because we're iterating over several tracks
2766          *   then (DASD_ECKD_CCW_READ_COUNT_MT)
2767          * - when we've reached the end of sensible data in the buffer (the
2768          *   record will be 0 then)
2769          */
2770         for (i = start; i < max; i++) {
2771                 if (i > start) {
2772                         if ((fmt_buffer[i].head == head &&
2773                             fmt_buffer[i].record == 1) ||
2774                             fmt_buffer[i].head != head ||
2775                             fmt_buffer[i].record == 0)
2776                                 break;
2777                 }
2778         }
2779
2780         return i - start;
2781 }
2782
2783 /*
2784  * Evaluate a given range of tracks. Data like number of records, blocksize,
2785  * record ids, and key length are compared with expected data.
2786  *
2787  * If a mismatch occurs, the corresponding error bit is set, as well as
2788  * additional information, depending on the error.
2789  */
2790 static void dasd_eckd_format_evaluate_tracks(struct eckd_count *fmt_buffer,
2791                                              struct format_check_t *cdata,
2792                                              int rpt_max, int rpt_exp,
2793                                              int trk_per_cyl, int tpm)
2794 {
2795         struct ch_t geo;
2796         int max_entries;
2797         int count = 0;
2798         int trkcount;
2799         int blksize;
2800         int pos = 0;
2801         int i, j;
2802         int kl;
2803
2804         trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
2805         max_entries = trkcount * rpt_max;
2806
2807         for (i = cdata->expect.start_unit; i <= cdata->expect.stop_unit; i++) {
2808                 /* Calculate the correct next starting position in the buffer */
2809                 if (tpm) {
2810                         while (fmt_buffer[pos].record == 0 &&
2811                                fmt_buffer[pos].dl == 0) {
2812                                 if (pos++ > max_entries)
2813                                         break;
2814                         }
2815                 } else {
2816                         if (i != cdata->expect.start_unit)
2817                                 pos += rpt_max - count;
2818                 }
2819
2820                 /* Calculate the expected geo values for the current track */
2821                 set_ch_t(&geo, i / trk_per_cyl, i % trk_per_cyl);
2822
2823                 /* Count and check number of records */
2824                 count = dasd_eckd_count_records(fmt_buffer, pos, pos + rpt_max);
2825
2826                 if (count < rpt_exp) {
2827                         cdata->result = DASD_FMT_ERR_TOO_FEW_RECORDS;
2828                         break;
2829                 }
2830                 if (count > rpt_exp) {
2831                         cdata->result = DASD_FMT_ERR_TOO_MANY_RECORDS;
2832                         break;
2833                 }
2834
2835                 for (j = 0; j < count; j++, pos++) {
2836                         blksize = cdata->expect.blksize;
2837                         kl = 0;
2838
2839                         /*
2840                          * Set special values when checking CDL formatted
2841                          * devices.
2842                          */
2843                         if ((cdata->expect.intensity & 0x08) &&
2844                             geo.cyl == 0 && geo.head == 0) {
2845                                 if (j < 3) {
2846                                         blksize = sizes_trk0[j] - 4;
2847                                         kl = 4;
2848                                 }
2849                         }
2850                         if ((cdata->expect.intensity & 0x08) &&
2851                             geo.cyl == 0 && geo.head == 1) {
2852                                 blksize = LABEL_SIZE - 44;
2853                                 kl = 44;
2854                         }
2855
2856                         /* Check blocksize */
2857                         if (fmt_buffer[pos].dl != blksize) {
2858                                 cdata->result = DASD_FMT_ERR_BLKSIZE;
2859                                 goto out;
2860                         }
2861                         /* Check if key length is 0 */
2862                         if (fmt_buffer[pos].kl != kl) {
2863                                 cdata->result = DASD_FMT_ERR_KEY_LENGTH;
2864                                 goto out;
2865                         }
2866                         /* Check if record_id is correct */
2867                         if (fmt_buffer[pos].cyl != geo.cyl ||
2868                             fmt_buffer[pos].head != geo.head ||
2869                             fmt_buffer[pos].record != (j + 1)) {
2870                                 cdata->result = DASD_FMT_ERR_RECORD_ID;
2871                                 goto out;
2872                         }
2873                 }
2874         }
2875
2876 out:
2877         /*
2878          * In case of no errors, we need to decrease by one
2879          * to get the correct positions.
2880          */
2881         if (!cdata->result) {
2882                 i--;
2883                 pos--;
2884         }
2885
2886         cdata->unit = i;
2887         cdata->num_records = count;
2888         cdata->rec = fmt_buffer[pos].record;
2889         cdata->blksize = fmt_buffer[pos].dl;
2890         cdata->key_length = fmt_buffer[pos].kl;
2891 }
2892
2893 /*
2894  * Check the format of a range of tracks of a DASD.
2895  */
2896 static int dasd_eckd_check_device_format(struct dasd_device *base,
2897                                          struct format_check_t *cdata,
2898                                          int enable_pav)
2899 {
2900         struct dasd_eckd_private *private = base->private;
2901         struct eckd_count *fmt_buffer;
2902         struct irb irb;
2903         int rpt_max, rpt_exp;
2904         int fmt_buffer_size;
2905         int trk_per_cyl;
2906         int trkcount;
2907         int tpm = 0;
2908         int rc;
2909
2910         trk_per_cyl = private->rdc_data.trk_per_cyl;
2911
2912         /* Get maximum and expected amount of records per track */
2913         rpt_max = recs_per_track(&private->rdc_data, 0, 512) + 1;
2914         rpt_exp = recs_per_track(&private->rdc_data, 0, cdata->expect.blksize);
2915
2916         trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
2917         fmt_buffer_size = trkcount * rpt_max * sizeof(struct eckd_count);
2918
2919         fmt_buffer = kzalloc(fmt_buffer_size, GFP_KERNEL | GFP_DMA);
2920         if (!fmt_buffer)
2921                 return -ENOMEM;
2922
2923         /*
2924          * A certain FICON feature subset is needed to operate in transport
2925          * mode. Additionally, the support for transport mode is implicitly
2926          * checked by comparing the buffer size with fcx_max_data. As long as
2927          * the buffer size is smaller we can operate in transport mode and
2928          * process multiple tracks. If not, only one track at once is being
2929          * processed using command mode.
2930          */
2931         if ((private->features.feature[40] & 0x04) &&
2932             fmt_buffer_size <= private->fcx_max_data)
2933                 tpm = 1;
2934
2935         rc = dasd_eckd_format_process_data(base, &cdata->expect, enable_pav,
2936                                            tpm, fmt_buffer, rpt_max, &irb);
2937         if (rc && rc != -EIO)
2938                 goto out;
2939         if (rc == -EIO) {
2940                 /*
2941                  * If our first attempt with transport mode enabled comes back
2942                  * with an incorrect length error, we're going to retry the
2943                  * check with command mode.
2944                  */
2945                 if (tpm && scsw_cstat(&irb.scsw) == 0x40) {
2946                         tpm = 0;
2947                         rc = dasd_eckd_format_process_data(base, &cdata->expect,
2948                                                            enable_pav, tpm,
2949                                                            fmt_buffer, rpt_max,
2950                                                            &irb);
2951                         if (rc)
2952                                 goto out;
2953                 } else {
2954                         goto out;
2955                 }
2956         }
2957
2958         dasd_eckd_format_evaluate_tracks(fmt_buffer, cdata, rpt_max, rpt_exp,
2959                                          trk_per_cyl, tpm);
2960
2961 out:
2962         kfree(fmt_buffer);
2963
2964         return rc;
2965 }
2966
2967 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2968 {
2969         if (cqr->retries < 0) {
2970                 cqr->status = DASD_CQR_FAILED;
2971                 return;
2972         }
2973         cqr->status = DASD_CQR_FILLED;
2974         if (cqr->block && (cqr->startdev != cqr->block->base)) {
2975                 dasd_eckd_reset_ccw_to_base_io(cqr);
2976                 cqr->startdev = cqr->block->base;
2977                 cqr->lpm = cqr->block->base->path_data.opm;
2978         }
2979 };
2980
2981 static dasd_erp_fn_t
2982 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2983 {
2984         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2985         struct ccw_device *cdev = device->cdev;
2986
2987         switch (cdev->id.cu_type) {
2988         case 0x3990:
2989         case 0x2105:
2990         case 0x2107:
2991         case 0x1750:
2992                 return dasd_3990_erp_action;
2993         case 0x9343:
2994         case 0x3880:
2995         default:
2996                 return dasd_default_erp_action;
2997         }
2998 }
2999
3000 static dasd_erp_fn_t
3001 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
3002 {
3003         return dasd_default_erp_postaction;
3004 }
3005
3006 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
3007                                               struct dasd_ccw_req *cqr,
3008                                               struct irb *irb)
3009 {
3010         char mask;
3011         char *sense = NULL;
3012         struct dasd_eckd_private *private = device->private;
3013
3014         /* first of all check for state change pending interrupt */
3015         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
3016         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
3017                 /*
3018                  * for alias only, not in offline processing
3019                  * and only if not suspended
3020                  */
3021                 if (!device->block && private->lcu &&
3022                     device->state == DASD_STATE_ONLINE &&
3023                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3024                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
3025                         /* schedule worker to reload device */
3026                         dasd_reload_device(device);
3027                 }
3028                 dasd_generic_handle_state_change(device);
3029                 return;
3030         }
3031
3032         sense = dasd_get_sense(irb);
3033         if (!sense)
3034                 return;
3035
3036         /* summary unit check */
3037         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
3038             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
3039                 if (test_and_set_bit(DASD_FLAG_SUC, &device->flags)) {
3040                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3041                                       "eckd suc: device already notified");
3042                         return;
3043                 }
3044                 sense = dasd_get_sense(irb);
3045                 if (!sense) {
3046                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3047                                       "eckd suc: no reason code available");
3048                         clear_bit(DASD_FLAG_SUC, &device->flags);
3049                         return;
3050
3051                 }
3052                 private->suc_reason = sense[8];
3053                 DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x",
3054                               "eckd handle summary unit check: reason",
3055                               private->suc_reason);
3056                 dasd_get_device(device);
3057                 if (!schedule_work(&device->suc_work))
3058                         dasd_put_device(device);
3059
3060                 return;
3061         }
3062
3063         /* service information message SIM */
3064         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
3065             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
3066                 dasd_3990_erp_handle_sim(device, sense);
3067                 return;
3068         }
3069
3070         /* loss of device reservation is handled via base devices only
3071          * as alias devices may be used with several bases
3072          */
3073         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
3074             (sense[7] == 0x3F) &&
3075             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
3076             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
3077                 if (device->features & DASD_FEATURE_FAILONSLCK)
3078                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
3079                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3080                 dev_err(&device->cdev->dev,
3081                         "The device reservation was lost\n");
3082         }
3083 }
3084
3085 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
3086                                                struct dasd_device *startdev,
3087                                                struct dasd_block *block,
3088                                                struct request *req,
3089                                                sector_t first_rec,
3090                                                sector_t last_rec,
3091                                                sector_t first_trk,
3092                                                sector_t last_trk,
3093                                                unsigned int first_offs,
3094                                                unsigned int last_offs,
3095                                                unsigned int blk_per_trk,
3096                                                unsigned int blksize)
3097 {
3098         struct dasd_eckd_private *private;
3099         unsigned long *idaws;
3100         struct LO_eckd_data *LO_data;
3101         struct dasd_ccw_req *cqr;
3102         struct ccw1 *ccw;
3103         struct req_iterator iter;
3104         struct bio_vec bv;
3105         char *dst;
3106         unsigned int off;
3107         int count, cidaw, cplength, datasize;
3108         sector_t recid;
3109         unsigned char cmd, rcmd;
3110         int use_prefix;
3111         struct dasd_device *basedev;
3112
3113         basedev = block->base;
3114         private = basedev->private;
3115         if (rq_data_dir(req) == READ)
3116                 cmd = DASD_ECKD_CCW_READ_MT;
3117         else if (rq_data_dir(req) == WRITE)
3118                 cmd = DASD_ECKD_CCW_WRITE_MT;
3119         else
3120                 return ERR_PTR(-EINVAL);
3121
3122         /* Check struct bio and count the number of blocks for the request. */
3123         count = 0;
3124         cidaw = 0;
3125         rq_for_each_segment(bv, req, iter) {
3126                 if (bv.bv_len & (blksize - 1))
3127                         /* Eckd can only do full blocks. */
3128                         return ERR_PTR(-EINVAL);
3129                 count += bv.bv_len >> (block->s2b_shift + 9);
3130                 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
3131                         cidaw += bv.bv_len >> (block->s2b_shift + 9);
3132         }
3133         /* Paranoia. */
3134         if (count != last_rec - first_rec + 1)
3135                 return ERR_PTR(-EINVAL);
3136
3137         /* use the prefix command if available */
3138         use_prefix = private->features.feature[8] & 0x01;
3139         if (use_prefix) {
3140                 /* 1x prefix + number of blocks */
3141                 cplength = 2 + count;
3142                 /* 1x prefix + cidaws*sizeof(long) */
3143                 datasize = sizeof(struct PFX_eckd_data) +
3144                         sizeof(struct LO_eckd_data) +
3145                         cidaw * sizeof(unsigned long);
3146         } else {
3147                 /* 1x define extent + 1x locate record + number of blocks */
3148                 cplength = 2 + count;
3149                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
3150                 datasize = sizeof(struct DE_eckd_data) +
3151                         sizeof(struct LO_eckd_data) +
3152                         cidaw * sizeof(unsigned long);
3153         }
3154         /* Find out the number of additional locate record ccws for cdl. */
3155         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
3156                 if (last_rec >= 2*blk_per_trk)
3157                         count = 2*blk_per_trk - first_rec;
3158                 cplength += count;
3159                 datasize += count*sizeof(struct LO_eckd_data);
3160         }
3161         /* Allocate the ccw request. */
3162         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3163                                    startdev);
3164         if (IS_ERR(cqr))
3165                 return cqr;
3166         ccw = cqr->cpaddr;
3167         /* First ccw is define extent or prefix. */
3168         if (use_prefix) {
3169                 if (prefix(ccw++, cqr->data, first_trk,
3170                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
3171                         /* Clock not in sync and XRC is enabled.
3172                          * Try again later.
3173                          */
3174                         dasd_sfree_request(cqr, startdev);
3175                         return ERR_PTR(-EAGAIN);
3176                 }
3177                 idaws = (unsigned long *) (cqr->data +
3178                                            sizeof(struct PFX_eckd_data));
3179         } else {
3180                 if (define_extent(ccw++, cqr->data, first_trk,
3181                                   last_trk, cmd, basedev) == -EAGAIN) {
3182                         /* Clock not in sync and XRC is enabled.
3183                          * Try again later.
3184                          */
3185                         dasd_sfree_request(cqr, startdev);
3186                         return ERR_PTR(-EAGAIN);
3187                 }
3188                 idaws = (unsigned long *) (cqr->data +
3189                                            sizeof(struct DE_eckd_data));
3190         }
3191         /* Build locate_record+read/write/ccws. */
3192         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
3193         recid = first_rec;
3194         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
3195                 /* Only standard blocks so there is just one locate record. */
3196                 ccw[-1].flags |= CCW_FLAG_CC;
3197                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
3198                               last_rec - recid + 1, cmd, basedev, blksize);
3199         }
3200         rq_for_each_segment(bv, req, iter) {
3201                 dst = page_address(bv.bv_page) + bv.bv_offset;
3202                 if (dasd_page_cache) {
3203                         char *copy = kmem_cache_alloc(dasd_page_cache,
3204                                                       GFP_DMA | __GFP_NOWARN);
3205                         if (copy && rq_data_dir(req) == WRITE)
3206                                 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
3207                         if (copy)
3208                                 dst = copy + bv.bv_offset;
3209                 }
3210                 for (off = 0; off < bv.bv_len; off += blksize) {
3211                         sector_t trkid = recid;
3212                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
3213                         rcmd = cmd;
3214                         count = blksize;
3215                         /* Locate record for cdl special block ? */
3216                         if (private->uses_cdl && recid < 2*blk_per_trk) {
3217                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
3218                                         rcmd |= 0x8;
3219                                         count = dasd_eckd_cdl_reclen(recid);
3220                                         if (count < blksize &&
3221                                             rq_data_dir(req) == READ)
3222                                                 memset(dst + count, 0xe5,
3223                                                        blksize - count);
3224                                 }
3225                                 ccw[-1].flags |= CCW_FLAG_CC;
3226                                 locate_record(ccw++, LO_data++,
3227                                               trkid, recoffs + 1,
3228                                               1, rcmd, basedev, count);
3229                         }
3230                         /* Locate record for standard blocks ? */
3231                         if (private->uses_cdl && recid == 2*blk_per_trk) {
3232                                 ccw[-1].flags |= CCW_FLAG_CC;
3233                                 locate_record(ccw++, LO_data++,
3234                                               trkid, recoffs + 1,
3235                                               last_rec - recid + 1,
3236                                               cmd, basedev, count);
3237                         }
3238                         /* Read/write ccw. */
3239                         ccw[-1].flags |= CCW_FLAG_CC;
3240                         ccw->cmd_code = rcmd;
3241                         ccw->count = count;
3242                         if (idal_is_needed(dst, blksize)) {
3243                                 ccw->cda = (__u32)(addr_t) idaws;
3244                                 ccw->flags = CCW_FLAG_IDA;
3245                                 idaws = idal_create_words(idaws, dst, blksize);
3246                         } else {
3247                                 ccw->cda = (__u32)(addr_t) dst;
3248                                 ccw->flags = 0;
3249                         }
3250                         ccw++;
3251                         dst += blksize;
3252                         recid++;
3253                 }
3254         }
3255         if (blk_noretry_request(req) ||
3256             block->base->features & DASD_FEATURE_FAILFAST)
3257                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3258         cqr->startdev = startdev;
3259         cqr->memdev = startdev;
3260         cqr->block = block;
3261         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3262         cqr->lpm = startdev->path_data.ppm;
3263         cqr->retries = startdev->default_retries;
3264         cqr->buildclk = get_tod_clock();
3265         cqr->status = DASD_CQR_FILLED;
3266         return cqr;
3267 }
3268
3269 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
3270                                                struct dasd_device *startdev,
3271                                                struct dasd_block *block,
3272                                                struct request *req,
3273                                                sector_t first_rec,
3274                                                sector_t last_rec,
3275                                                sector_t first_trk,
3276                                                sector_t last_trk,
3277                                                unsigned int first_offs,
3278                                                unsigned int last_offs,
3279                                                unsigned int blk_per_trk,
3280                                                unsigned int blksize)
3281 {
3282         unsigned long *idaws;
3283         struct dasd_ccw_req *cqr;
3284         struct ccw1 *ccw;
3285         struct req_iterator iter;
3286         struct bio_vec bv;
3287         char *dst, *idaw_dst;
3288         unsigned int cidaw, cplength, datasize;
3289         unsigned int tlf;
3290         sector_t recid;
3291         unsigned char cmd;
3292         struct dasd_device *basedev;
3293         unsigned int trkcount, count, count_to_trk_end;
3294         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
3295         unsigned char new_track, end_idaw;
3296         sector_t trkid;
3297         unsigned int recoffs;
3298
3299         basedev = block->base;
3300         if (rq_data_dir(req) == READ)
3301                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3302         else if (rq_data_dir(req) == WRITE)
3303                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3304         else
3305                 return ERR_PTR(-EINVAL);
3306
3307         /* Track based I/O needs IDAWs for each page, and not just for
3308          * 64 bit addresses. We need additional idals for pages
3309          * that get filled from two tracks, so we use the number
3310          * of records as upper limit.
3311          */
3312         cidaw = last_rec - first_rec + 1;
3313         trkcount = last_trk - first_trk + 1;
3314
3315         /* 1x prefix + one read/write ccw per track */
3316         cplength = 1 + trkcount;
3317
3318         /* on 31-bit we need space for two 32 bit addresses per page
3319          * on 64-bit one 64 bit address
3320          */
3321         datasize = sizeof(struct PFX_eckd_data) +
3322                 cidaw * sizeof(unsigned long long);
3323
3324         /* Allocate the ccw request. */
3325         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3326                                    startdev);
3327         if (IS_ERR(cqr))
3328                 return cqr;
3329         ccw = cqr->cpaddr;
3330         /* transfer length factor: how many bytes to read from the last track */
3331         if (first_trk == last_trk)
3332                 tlf = last_offs - first_offs + 1;
3333         else
3334                 tlf = last_offs + 1;
3335         tlf *= blksize;
3336
3337         if (prefix_LRE(ccw++, cqr->data, first_trk,
3338                        last_trk, cmd, basedev, startdev,
3339                        1 /* format */, first_offs + 1,
3340                        trkcount, blksize,
3341                        tlf) == -EAGAIN) {
3342                 /* Clock not in sync and XRC is enabled.
3343                  * Try again later.
3344                  */
3345                 dasd_sfree_request(cqr, startdev);
3346                 return ERR_PTR(-EAGAIN);
3347         }
3348
3349         /*
3350          * The translation of request into ccw programs must meet the
3351          * following conditions:
3352          * - all idaws but the first and the last must address full pages
3353          *   (or 2K blocks on 31-bit)
3354          * - the scope of a ccw and it's idal ends with the track boundaries
3355          */
3356         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
3357         recid = first_rec;
3358         new_track = 1;
3359         end_idaw = 0;
3360         len_to_track_end = 0;
3361         idaw_dst = NULL;
3362         idaw_len = 0;
3363         rq_for_each_segment(bv, req, iter) {
3364                 dst = page_address(bv.bv_page) + bv.bv_offset;
3365                 seg_len = bv.bv_len;
3366                 while (seg_len) {
3367                         if (new_track) {
3368                                 trkid = recid;
3369                                 recoffs = sector_div(trkid, blk_per_trk);
3370                                 count_to_trk_end = blk_per_trk - recoffs;
3371                                 count = min((last_rec - recid + 1),
3372                                             (sector_t)count_to_trk_end);
3373                                 len_to_track_end = count * blksize;
3374                                 ccw[-1].flags |= CCW_FLAG_CC;
3375                                 ccw->cmd_code = cmd;
3376                                 ccw->count = len_to_track_end;
3377                                 ccw->cda = (__u32)(addr_t)idaws;
3378                                 ccw->flags = CCW_FLAG_IDA;
3379                                 ccw++;
3380                                 recid += count;
3381                                 new_track = 0;
3382                                 /* first idaw for a ccw may start anywhere */
3383                                 if (!idaw_dst)
3384                                         idaw_dst = dst;
3385                         }
3386                         /* If we start a new idaw, we must make sure that it
3387                          * starts on an IDA_BLOCK_SIZE boundary.
3388                          * If we continue an idaw, we must make sure that the
3389                          * current segment begins where the so far accumulated
3390                          * idaw ends
3391                          */
3392                         if (!idaw_dst) {
3393                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
3394                                         dasd_sfree_request(cqr, startdev);
3395                                         return ERR_PTR(-ERANGE);
3396                                 } else
3397                                         idaw_dst = dst;
3398                         }
3399                         if ((idaw_dst + idaw_len) != dst) {
3400                                 dasd_sfree_request(cqr, startdev);
3401                                 return ERR_PTR(-ERANGE);
3402                         }
3403                         part_len = min(seg_len, len_to_track_end);
3404                         seg_len -= part_len;
3405                         dst += part_len;
3406                         idaw_len += part_len;
3407                         len_to_track_end -= part_len;
3408                         /* collected memory area ends on an IDA_BLOCK border,
3409                          * -> create an idaw
3410                          * idal_create_words will handle cases where idaw_len
3411                          * is larger then IDA_BLOCK_SIZE
3412                          */
3413                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
3414                                 end_idaw = 1;
3415                         /* We also need to end the idaw at track end */
3416                         if (!len_to_track_end) {
3417                                 new_track = 1;
3418                                 end_idaw = 1;
3419                         }
3420                         if (end_idaw) {
3421                                 idaws = idal_create_words(idaws, idaw_dst,
3422                                                           idaw_len);
3423                                 idaw_dst = NULL;
3424                                 idaw_len = 0;
3425                                 end_idaw = 0;
3426                         }
3427                 }
3428         }
3429
3430         if (blk_noretry_request(req) ||
3431             block->base->features & DASD_FEATURE_FAILFAST)
3432                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3433         cqr->startdev = startdev;
3434         cqr->memdev = startdev;
3435         cqr->block = block;
3436         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3437         cqr->lpm = startdev->path_data.ppm;
3438         cqr->retries = startdev->default_retries;
3439         cqr->buildclk = get_tod_clock();
3440         cqr->status = DASD_CQR_FILLED;
3441         return cqr;
3442 }
3443
3444 static int prepare_itcw(struct itcw *itcw,
3445                         unsigned int trk, unsigned int totrk, int cmd,
3446                         struct dasd_device *basedev,
3447                         struct dasd_device *startdev,
3448                         unsigned int rec_on_trk, int count,
3449                         unsigned int blksize,
3450                         unsigned int total_data_size,
3451                         unsigned int tlf,
3452                         unsigned int blk_per_trk)
3453 {
3454         struct PFX_eckd_data pfxdata;
3455         struct dasd_eckd_private *basepriv, *startpriv;
3456         struct DE_eckd_data *dedata;
3457         struct LRE_eckd_data *lredata;
3458         struct dcw *dcw;
3459
3460         u32 begcyl, endcyl;
3461         u16 heads, beghead, endhead;
3462         u8 pfx_cmd;
3463
3464         int rc = 0;
3465         int sector = 0;
3466         int dn, d;
3467
3468
3469         /* setup prefix data */
3470         basepriv = basedev->private;
3471         startpriv = startdev->private;
3472         dedata = &pfxdata.define_extent;
3473         lredata = &pfxdata.locate_record;
3474
3475         memset(&pfxdata, 0, sizeof(pfxdata));
3476         pfxdata.format = 1; /* PFX with LRE */
3477         pfxdata.base_address = basepriv->ned->unit_addr;
3478         pfxdata.base_lss = basepriv->ned->ID;
3479         pfxdata.validity.define_extent = 1;
3480
3481         /* private uid is kept up to date, conf_data may be outdated */
3482         if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
3483                 pfxdata.validity.verify_base = 1;
3484
3485         if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
3486                 pfxdata.validity.verify_base = 1;
3487                 pfxdata.validity.hyper_pav = 1;
3488         }
3489
3490         switch (cmd) {
3491         case DASD_ECKD_CCW_READ_TRACK_DATA:
3492                 dedata->mask.perm = 0x1;
3493                 dedata->attributes.operation = basepriv->attrib.operation;
3494                 dedata->blk_size = blksize;
3495                 dedata->ga_extended |= 0x42;
3496                 lredata->operation.orientation = 0x0;
3497                 lredata->operation.operation = 0x0C;
3498                 lredata->auxiliary.check_bytes = 0x01;
3499                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
3500                 break;
3501         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
3502                 dedata->mask.perm = 0x02;
3503                 dedata->attributes.operation = basepriv->attrib.operation;
3504                 dedata->blk_size = blksize;
3505                 rc = check_XRC_on_prefix(&pfxdata, basedev);
3506                 dedata->ga_extended |= 0x42;
3507                 lredata->operation.orientation = 0x0;
3508                 lredata->operation.operation = 0x3F;
3509                 lredata->extended_operation = 0x23;
3510                 lredata->auxiliary.check_bytes = 0x2;
3511                 pfx_cmd = DASD_ECKD_CCW_PFX;
3512                 break;
3513         case DASD_ECKD_CCW_READ_COUNT_MT:
3514                 dedata->mask.perm = 0x1;
3515                 dedata->attributes.operation = DASD_BYPASS_CACHE;
3516                 dedata->ga_extended |= 0x42;
3517                 dedata->blk_size = blksize;
3518                 lredata->operation.orientation = 0x2;
3519                 lredata->operation.operation = 0x16;
3520                 lredata->auxiliary.check_bytes = 0x01;
3521                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
3522                 break;
3523         default:
3524                 DBF_DEV_EVENT(DBF_ERR, basedev,
3525                               "prepare itcw, unknown opcode 0x%x", cmd);
3526                 BUG();
3527                 break;
3528         }
3529         if (rc)
3530                 return rc;
3531
3532         dedata->attributes.mode = 0x3;  /* ECKD */
3533
3534         heads = basepriv->rdc_data.trk_per_cyl;
3535         begcyl = trk / heads;
3536         beghead = trk % heads;
3537         endcyl = totrk / heads;
3538         endhead = totrk % heads;
3539
3540         /* check for sequential prestage - enhance cylinder range */
3541         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
3542             dedata->attributes.operation == DASD_SEQ_ACCESS) {
3543
3544                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
3545                         endcyl += basepriv->attrib.nr_cyl;
3546                 else
3547                         endcyl = (basepriv->real_cyl - 1);
3548         }
3549
3550         set_ch_t(&dedata->beg_ext, begcyl, beghead);
3551         set_ch_t(&dedata->end_ext, endcyl, endhead);
3552
3553         dedata->ep_format = 0x20; /* records per track is valid */
3554         dedata->ep_rec_per_track = blk_per_trk;
3555
3556         if (rec_on_trk) {
3557                 switch (basepriv->rdc_data.dev_type) {
3558                 case 0x3390:
3559                         dn = ceil_quot(blksize + 6, 232);
3560                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
3561                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
3562                         break;
3563                 case 0x3380:
3564                         d = 7 + ceil_quot(blksize + 12, 32);
3565                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
3566                         break;
3567                 }
3568         }
3569
3570         if (cmd == DASD_ECKD_CCW_READ_COUNT_MT) {
3571                 lredata->auxiliary.length_valid = 0;
3572                 lredata->auxiliary.length_scope = 0;
3573                 lredata->sector = 0xff;
3574         } else {
3575                 lredata->auxiliary.length_valid = 1;
3576                 lredata->auxiliary.length_scope = 1;
3577                 lredata->sector = sector;
3578         }
3579         lredata->auxiliary.imbedded_ccw_valid = 1;
3580         lredata->length = tlf;
3581         lredata->imbedded_ccw = cmd;
3582         lredata->count = count;
3583         set_ch_t(&lredata->seek_addr, begcyl, beghead);
3584         lredata->search_arg.cyl = lredata->seek_addr.cyl;
3585         lredata->search_arg.head = lredata->seek_addr.head;
3586         lredata->search_arg.record = rec_on_trk;
3587
3588         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
3589                      &pfxdata, sizeof(pfxdata), total_data_size);
3590         return PTR_RET(dcw);
3591 }
3592
3593 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
3594                                                struct dasd_device *startdev,
3595                                                struct dasd_block *block,
3596                                                struct request *req,
3597                                                sector_t first_rec,
3598                                                sector_t last_rec,
3599                                                sector_t first_trk,
3600                                                sector_t last_trk,
3601                                                unsigned int first_offs,
3602                                                unsigned int last_offs,
3603                                                unsigned int blk_per_trk,
3604                                                unsigned int blksize)
3605 {
3606         struct dasd_ccw_req *cqr;
3607         struct req_iterator iter;
3608         struct bio_vec bv;
3609         char *dst;
3610         unsigned int trkcount, ctidaw;
3611         unsigned char cmd;
3612         struct dasd_device *basedev;
3613         unsigned int tlf;
3614         struct itcw *itcw;
3615         struct tidaw *last_tidaw = NULL;
3616         int itcw_op;
3617         size_t itcw_size;
3618         u8 tidaw_flags;
3619         unsigned int seg_len, part_len, len_to_track_end;
3620         unsigned char new_track;
3621         sector_t recid, trkid;
3622         unsigned int offs;
3623         unsigned int count, count_to_trk_end;
3624         int ret;
3625
3626         basedev = block->base;
3627         if (rq_data_dir(req) == READ) {
3628                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3629                 itcw_op = ITCW_OP_READ;
3630         } else if (rq_data_dir(req) == WRITE) {
3631                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3632                 itcw_op = ITCW_OP_WRITE;
3633         } else
3634                 return ERR_PTR(-EINVAL);
3635
3636         /* trackbased I/O needs address all memory via TIDAWs,
3637          * not just for 64 bit addresses. This allows us to map
3638          * each segment directly to one tidaw.
3639          * In the case of write requests, additional tidaws may
3640          * be needed when a segment crosses a track boundary.
3641          */
3642         trkcount = last_trk - first_trk + 1;
3643         ctidaw = 0;
3644         rq_for_each_segment(bv, req, iter) {
3645                 ++ctidaw;
3646         }
3647         if (rq_data_dir(req) == WRITE)
3648                 ctidaw += (last_trk - first_trk);
3649
3650         /* Allocate the ccw request. */
3651         itcw_size = itcw_calc_size(0, ctidaw, 0);
3652         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
3653         if (IS_ERR(cqr))
3654                 return cqr;
3655
3656         /* transfer length factor: how many bytes to read from the last track */
3657         if (first_trk == last_trk)
3658                 tlf = last_offs - first_offs + 1;
3659         else
3660                 tlf = last_offs + 1;
3661         tlf *= blksize;
3662
3663         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
3664         if (IS_ERR(itcw)) {
3665                 ret = -EINVAL;
3666                 goto out_error;
3667         }
3668         cqr->cpaddr = itcw_get_tcw(itcw);
3669         if (prepare_itcw(itcw, first_trk, last_trk,
3670                          cmd, basedev, startdev,
3671                          first_offs + 1,
3672                          trkcount, blksize,
3673                          (last_rec - first_rec + 1) * blksize,
3674                          tlf, blk_per_trk) == -EAGAIN) {
3675                 /* Clock not in sync and XRC is enabled.
3676                  * Try again later.
3677                  */
3678                 ret = -EAGAIN;
3679                 goto out_error;
3680         }
3681         len_to_track_end = 0;
3682         /*
3683          * A tidaw can address 4k of memory, but must not cross page boundaries
3684          * We can let the block layer handle this by setting
3685          * blk_queue_segment_boundary to page boundaries and
3686          * blk_max_segment_size to page size when setting up the request queue.
3687          * For write requests, a TIDAW must not cross track boundaries, because
3688          * we have to set the CBC flag on the last tidaw for each track.
3689          */
3690         if (rq_data_dir(req) == WRITE) {
3691                 new_track = 1;
3692                 recid = first_rec;
3693                 rq_for_each_segment(bv, req, iter) {
3694                         dst = page_address(bv.bv_page) + bv.bv_offset;
3695                         seg_len = bv.bv_len;
3696                         while (seg_len) {
3697                                 if (new_track) {
3698                                         trkid = recid;
3699                                         offs = sector_div(trkid, blk_per_trk);
3700                                         count_to_trk_end = blk_per_trk - offs;
3701                                         count = min((last_rec - recid + 1),
3702                                                     (sector_t)count_to_trk_end);
3703                                         len_to_track_end = count * blksize;
3704                                         recid += count;
3705                                         new_track = 0;
3706                                 }
3707                                 part_len = min(seg_len, len_to_track_end);
3708                                 seg_len -= part_len;
3709                                 len_to_track_end -= part_len;
3710                                 /* We need to end the tidaw at track end */
3711                                 if (!len_to_track_end) {
3712                                         new_track = 1;
3713                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
3714                                 } else
3715                                         tidaw_flags = 0;
3716                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
3717                                                             dst, part_len);
3718                                 if (IS_ERR(last_tidaw)) {
3719                                         ret = -EINVAL;
3720                                         goto out_error;
3721                                 }
3722                                 dst += part_len;
3723                         }
3724                 }
3725         } else {
3726                 rq_for_each_segment(bv, req, iter) {
3727                         dst = page_address(bv.bv_page) + bv.bv_offset;
3728                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
3729                                                     dst, bv.bv_len);
3730                         if (IS_ERR(last_tidaw)) {
3731                                 ret = -EINVAL;
3732                                 goto out_error;
3733                         }
3734                 }
3735         }
3736         last_tidaw->flags |= TIDAW_FLAGS_LAST;
3737         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
3738         itcw_finalize(itcw);
3739
3740         if (blk_noretry_request(req) ||
3741             block->base->features & DASD_FEATURE_FAILFAST)
3742                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3743         cqr->cpmode = 1;
3744         cqr->startdev = startdev;
3745         cqr->memdev = startdev;
3746         cqr->block = block;
3747         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3748         cqr->lpm = startdev->path_data.ppm;
3749         cqr->retries = startdev->default_retries;
3750         cqr->buildclk = get_tod_clock();
3751         cqr->status = DASD_CQR_FILLED;
3752         return cqr;
3753 out_error:
3754         dasd_sfree_request(cqr, startdev);
3755         return ERR_PTR(ret);
3756 }
3757
3758 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3759                                                struct dasd_block *block,
3760                                                struct request *req)
3761 {
3762         int cmdrtd, cmdwtd;
3763         int use_prefix;
3764         int fcx_multitrack;
3765         struct dasd_eckd_private *private;
3766         struct dasd_device *basedev;
3767         sector_t first_rec, last_rec;
3768         sector_t first_trk, last_trk;
3769         unsigned int first_offs, last_offs;
3770         unsigned int blk_per_trk, blksize;
3771         int cdlspecial;
3772         unsigned int data_size;
3773         struct dasd_ccw_req *cqr;
3774
3775         basedev = block->base;
3776         private = basedev->private;
3777
3778         /* Calculate number of blocks/records per track. */
3779         blksize = block->bp_block;
3780         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3781         if (blk_per_trk == 0)
3782                 return ERR_PTR(-EINVAL);
3783         /* Calculate record id of first and last block. */
3784         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3785         first_offs = sector_div(first_trk, blk_per_trk);
3786         last_rec = last_trk =
3787                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3788         last_offs = sector_div(last_trk, blk_per_trk);
3789         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3790
3791         fcx_multitrack = private->features.feature[40] & 0x20;
3792         data_size = blk_rq_bytes(req);
3793         if (data_size % blksize)
3794                 return ERR_PTR(-EINVAL);
3795         /* tpm write request add CBC data on each track boundary */
3796         if (rq_data_dir(req) == WRITE)
3797                 data_size += (last_trk - first_trk) * 4;
3798
3799         /* is read track data and write track data in command mode supported? */
3800         cmdrtd = private->features.feature[9] & 0x20;
3801         cmdwtd = private->features.feature[12] & 0x40;
3802         use_prefix = private->features.feature[8] & 0x01;
3803
3804         cqr = NULL;
3805         if (cdlspecial || dasd_page_cache) {
3806                 /* do nothing, just fall through to the cmd mode single case */
3807         } else if ((data_size <= private->fcx_max_data)
3808                    && (fcx_multitrack || (first_trk == last_trk))) {
3809                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3810                                                     first_rec, last_rec,
3811                                                     first_trk, last_trk,
3812                                                     first_offs, last_offs,
3813                                                     blk_per_trk, blksize);
3814                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3815                     (PTR_ERR(cqr) != -ENOMEM))
3816                         cqr = NULL;
3817         } else if (use_prefix &&
3818                    (((rq_data_dir(req) == READ) && cmdrtd) ||
3819                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3820                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3821                                                    first_rec, last_rec,
3822                                                    first_trk, last_trk,
3823                                                    first_offs, last_offs,
3824                                                    blk_per_trk, blksize);
3825                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3826                     (PTR_ERR(cqr) != -ENOMEM))
3827                         cqr = NULL;
3828         }
3829         if (!cqr)
3830                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3831                                                     first_rec, last_rec,
3832                                                     first_trk, last_trk,
3833                                                     first_offs, last_offs,
3834                                                     blk_per_trk, blksize);
3835         return cqr;
3836 }
3837
3838 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
3839                                                struct dasd_block *block,
3840                                                struct request *req)
3841 {
3842         unsigned long *idaws;
3843         struct dasd_device *basedev;
3844         struct dasd_ccw_req *cqr;
3845         struct ccw1 *ccw;
3846         struct req_iterator iter;
3847         struct bio_vec bv;
3848         char *dst;
3849         unsigned char cmd;
3850         unsigned int trkcount;
3851         unsigned int seg_len, len_to_track_end;
3852         unsigned int first_offs;
3853         unsigned int cidaw, cplength, datasize;
3854         sector_t first_trk, last_trk, sectors;
3855         sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
3856         unsigned int pfx_datasize;
3857
3858         /*
3859          * raw track access needs to be mutiple of 64k and on 64k boundary
3860          * For read requests we can fix an incorrect alignment by padding
3861          * the request with dummy pages.
3862          */
3863         start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
3864         end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
3865                 DASD_RAW_SECTORS_PER_TRACK;
3866         end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
3867                 DASD_RAW_SECTORS_PER_TRACK;
3868         basedev = block->base;
3869         if ((start_padding_sectors || end_padding_sectors) &&
3870             (rq_data_dir(req) == WRITE)) {
3871                 DBF_DEV_EVENT(DBF_ERR, basedev,
3872                               "raw write not track aligned (%lu,%lu) req %p",
3873                               start_padding_sectors, end_padding_sectors, req);
3874                 cqr = ERR_PTR(-EINVAL);
3875                 goto out;
3876         }
3877
3878         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3879         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3880                 DASD_RAW_SECTORS_PER_TRACK;
3881         trkcount = last_trk - first_trk + 1;
3882         first_offs = 0;
3883
3884         if (rq_data_dir(req) == READ)
3885                 cmd = DASD_ECKD_CCW_READ_TRACK;
3886         else if (rq_data_dir(req) == WRITE)
3887                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3888         else {
3889                 cqr = ERR_PTR(-EINVAL);
3890                 goto out;
3891         }
3892
3893         /*
3894          * Raw track based I/O needs IDAWs for each page,
3895          * and not just for 64 bit addresses.
3896          */
3897         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3898
3899         /* 1x prefix + one read/write ccw per track */
3900         cplength = 1 + trkcount;
3901
3902         /*
3903          * struct PFX_eckd_data has up to 2 byte as extended parameter
3904          * this is needed for write full track and has to be mentioned
3905          * separately
3906          * add 8 instead of 2 to keep 8 byte boundary
3907          */
3908         pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
3909
3910         datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
3911
3912         /* Allocate the ccw request. */
3913         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3914                                    datasize, startdev);
3915         if (IS_ERR(cqr))
3916                 goto out;
3917         ccw = cqr->cpaddr;
3918
3919         if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
3920                        basedev, startdev, 1 /* format */, first_offs + 1,
3921                        trkcount, 0, 0) == -EAGAIN) {
3922                 /* Clock not in sync and XRC is enabled.
3923                  * Try again later.
3924                  */
3925                 dasd_sfree_request(cqr, startdev);
3926                 cqr = ERR_PTR(-EAGAIN);
3927                 goto out;
3928         }
3929
3930         idaws = (unsigned long *)(cqr->data + pfx_datasize);
3931         len_to_track_end = 0;
3932         if (start_padding_sectors) {
3933                 ccw[-1].flags |= CCW_FLAG_CC;
3934                 ccw->cmd_code = cmd;
3935                 /* maximum 3390 track size */
3936                 ccw->count = 57326;
3937                 /* 64k map to one track */
3938                 len_to_track_end = 65536 - start_padding_sectors * 512;
3939                 ccw->cda = (__u32)(addr_t)idaws;
3940                 ccw->flags |= CCW_FLAG_IDA;
3941                 ccw->flags |= CCW_FLAG_SLI;
3942                 ccw++;
3943                 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
3944                         idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3945         }
3946         rq_for_each_segment(bv, req, iter) {
3947                 dst = page_address(bv.bv_page) + bv.bv_offset;
3948                 seg_len = bv.bv_len;
3949                 if (cmd == DASD_ECKD_CCW_READ_TRACK)
3950                         memset(dst, 0, seg_len);
3951                 if (!len_to_track_end) {
3952                         ccw[-1].flags |= CCW_FLAG_CC;
3953                         ccw->cmd_code = cmd;
3954                         /* maximum 3390 track size */
3955                         ccw->count = 57326;
3956                         /* 64k map to one track */
3957                         len_to_track_end = 65536;
3958                         ccw->cda = (__u32)(addr_t)idaws;
3959                         ccw->flags |= CCW_FLAG_IDA;
3960                         ccw->flags |= CCW_FLAG_SLI;
3961                         ccw++;
3962                 }
3963                 len_to_track_end -= seg_len;
3964                 idaws = idal_create_words(idaws, dst, seg_len);
3965         }
3966         for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
3967                 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3968         if (blk_noretry_request(req) ||
3969             block->base->features & DASD_FEATURE_FAILFAST)
3970                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3971         cqr->startdev = startdev;
3972         cqr->memdev = startdev;
3973         cqr->block = block;
3974         cqr->expires = startdev->default_expires * HZ;
3975         cqr->lpm = startdev->path_data.ppm;
3976         cqr->retries = startdev->default_retries;
3977         cqr->buildclk = get_tod_clock();
3978         cqr->status = DASD_CQR_FILLED;
3979
3980         if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
3981                 cqr = NULL;
3982 out:
3983         return cqr;
3984 }
3985
3986
3987 static int
3988 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3989 {
3990         struct dasd_eckd_private *private;
3991         struct ccw1 *ccw;
3992         struct req_iterator iter;
3993         struct bio_vec bv;
3994         char *dst, *cda;
3995         unsigned int blksize, blk_per_trk, off;
3996         sector_t recid;
3997         int status;
3998
3999         if (!dasd_page_cache)
4000                 goto out;
4001         private = cqr->block->base->private;
4002         blksize = cqr->block->bp_block;
4003         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
4004         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
4005         ccw = cqr->cpaddr;
4006         /* Skip over define extent & locate record. */
4007         ccw++;
4008         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
4009                 ccw++;
4010         rq_for_each_segment(bv, req, iter) {
4011                 dst = page_address(bv.bv_page) + bv.bv_offset;
4012                 for (off = 0; off < bv.bv_len; off += blksize) {
4013                         /* Skip locate record. */
4014                         if (private->uses_cdl && recid <= 2*blk_per_trk)
4015                                 ccw++;
4016                         if (dst) {
4017                                 if (ccw->flags & CCW_FLAG_IDA)
4018                                         cda = *((char **)((addr_t) ccw->cda));
4019                                 else
4020                                         cda = (char *)((addr_t) ccw->cda);
4021                                 if (dst != cda) {
4022                                         if (rq_data_dir(req) == READ)
4023                                                 memcpy(dst, cda, bv.bv_len);
4024                                         kmem_cache_free(dasd_page_cache,
4025                                             (void *)((addr_t)cda & PAGE_MASK));
4026                                 }
4027                                 dst = NULL;
4028                         }
4029                         ccw++;
4030                         recid++;
4031                 }
4032         }
4033 out:
4034         status = cqr->status == DASD_CQR_DONE;
4035         dasd_sfree_request(cqr, cqr->memdev);
4036         return status;
4037 }
4038
4039 /*
4040  * Modify ccw/tcw in cqr so it can be started on a base device.
4041  *
4042  * Note that this is not enough to restart the cqr!
4043  * Either reset cqr->startdev as well (summary unit check handling)
4044  * or restart via separate cqr (as in ERP handling).
4045  */
4046 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
4047 {
4048         struct ccw1 *ccw;
4049         struct PFX_eckd_data *pfxdata;
4050         struct tcw *tcw;
4051         struct tccb *tccb;
4052         struct dcw *dcw;
4053
4054         if (cqr->cpmode == 1) {
4055                 tcw = cqr->cpaddr;
4056                 tccb = tcw_get_tccb(tcw);
4057                 dcw = (struct dcw *)&tccb->tca[0];
4058                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
4059                 pfxdata->validity.verify_base = 0;
4060                 pfxdata->validity.hyper_pav = 0;
4061         } else {
4062                 ccw = cqr->cpaddr;
4063                 pfxdata = cqr->data;
4064                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
4065                         pfxdata->validity.verify_base = 0;
4066                         pfxdata->validity.hyper_pav = 0;
4067                 }
4068         }
4069 }
4070
4071 #define DASD_ECKD_CHANQ_MAX_SIZE 4
4072
4073 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
4074                                                      struct dasd_block *block,
4075                                                      struct request *req)
4076 {
4077         struct dasd_eckd_private *private;
4078         struct dasd_device *startdev;
4079         unsigned long flags;
4080         struct dasd_ccw_req *cqr;
4081
4082         startdev = dasd_alias_get_start_dev(base);
4083         if (!startdev)
4084                 startdev = base;
4085         private = startdev->private;
4086         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
4087                 return ERR_PTR(-EBUSY);
4088
4089         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
4090         private->count++;
4091         if ((base->features & DASD_FEATURE_USERAW))
4092                 cqr = dasd_raw_build_cp(startdev, block, req);
4093         else
4094                 cqr = dasd_eckd_build_cp(startdev, block, req);
4095         if (IS_ERR(cqr))
4096                 private->count--;
4097         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
4098         return cqr;
4099 }
4100
4101 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
4102                                    struct request *req)
4103 {
4104         struct dasd_eckd_private *private;
4105         unsigned long flags;
4106
4107         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
4108         private = cqr->memdev->private;
4109         private->count--;
4110         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
4111         return dasd_eckd_free_cp(cqr, req);
4112 }
4113
4114 static int
4115 dasd_eckd_fill_info(struct dasd_device * device,
4116                     struct dasd_information2_t * info)
4117 {
4118         struct dasd_eckd_private *private = device->private;
4119
4120         info->label_block = 2;
4121         info->FBA_layout = private->uses_cdl ? 0 : 1;
4122         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
4123         info->characteristics_size = sizeof(private->rdc_data);
4124         memcpy(info->characteristics, &private->rdc_data,
4125                sizeof(private->rdc_data));
4126         info->confdata_size = min((unsigned long)private->conf_len,
4127                                   sizeof(info->configuration_data));
4128         memcpy(info->configuration_data, private->conf_data,
4129                info->confdata_size);
4130         return 0;
4131 }
4132
4133 /*
4134  * SECTION: ioctl functions for eckd devices.
4135  */
4136
4137 /*
4138  * Release device ioctl.
4139  * Buils a channel programm to releases a prior reserved
4140  * (see dasd_eckd_reserve) device.
4141  */
4142 static int
4143 dasd_eckd_release(struct dasd_device *device)
4144 {
4145         struct dasd_ccw_req *cqr;
4146         int rc;
4147         struct ccw1 *ccw;
4148         int useglobal;
4149
4150         if (!capable(CAP_SYS_ADMIN))
4151                 return -EACCES;
4152
4153         useglobal = 0;
4154         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
4155         if (IS_ERR(cqr)) {
4156                 mutex_lock(&dasd_reserve_mutex);
4157                 useglobal = 1;
4158                 cqr = &dasd_reserve_req->cqr;
4159                 memset(cqr, 0, sizeof(*cqr));
4160                 memset(&dasd_reserve_req->ccw, 0,
4161                        sizeof(dasd_reserve_req->ccw));
4162                 cqr->cpaddr = &dasd_reserve_req->ccw;
4163                 cqr->data = &dasd_reserve_req->data;
4164                 cqr->magic = DASD_ECKD_MAGIC;
4165         }
4166         ccw = cqr->cpaddr;
4167         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
4168         ccw->flags |= CCW_FLAG_SLI;
4169         ccw->count = 32;
4170         ccw->cda = (__u32)(addr_t) cqr->data;
4171         cqr->startdev = device;
4172         cqr->memdev = device;
4173         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4174         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4175         cqr->retries = 2;       /* set retry counter to enable basic ERP */
4176         cqr->expires = 2 * HZ;
4177         cqr->buildclk = get_tod_clock();
4178         cqr->status = DASD_CQR_FILLED;
4179
4180         rc = dasd_sleep_on_immediatly(cqr);
4181         if (!rc)
4182                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4183
4184         if (useglobal)
4185                 mutex_unlock(&dasd_reserve_mutex);
4186         else
4187                 dasd_sfree_request(cqr, cqr->memdev);
4188         return rc;
4189 }
4190
4191 /*
4192  * Reserve device ioctl.
4193  * Options are set to 'synchronous wait for interrupt' and
4194  * 'timeout the request'. This leads to a terminate IO if
4195  * the interrupt is outstanding for a certain time.
4196  */
4197 static int
4198 dasd_eckd_reserve(struct dasd_device *device)
4199 {
4200         struct dasd_ccw_req *cqr;
4201         int rc;
4202         struct ccw1 *ccw;
4203         int useglobal;
4204
4205         if (!capable(CAP_SYS_ADMIN))
4206                 return -EACCES;
4207
4208         useglobal = 0;
4209         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
4210         if (IS_ERR(cqr)) {
4211                 mutex_lock(&dasd_reserve_mutex);
4212                 useglobal = 1;
4213                 cqr = &dasd_reserve_req->cqr;
4214                 memset(cqr, 0, sizeof(*cqr));
4215                 memset(&dasd_reserve_req->ccw, 0,
4216                        sizeof(dasd_reserve_req->ccw));
4217                 cqr->cpaddr = &dasd_reserve_req->ccw;
4218                 cqr->data = &dasd_reserve_req->data;
4219                 cqr->magic = DASD_ECKD_MAGIC;
4220         }
4221         ccw = cqr->cpaddr;
4222         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
4223         ccw->flags |= CCW_FLAG_SLI;
4224         ccw->count = 32;
4225         ccw->cda = (__u32)(addr_t) cqr->data;
4226         cqr->startdev = device;
4227         cqr->memdev = device;
4228         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4229         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4230         cqr->retries = 2;       /* set retry counter to enable basic ERP */
4231         cqr->expires = 2 * HZ;
4232         cqr->buildclk = get_tod_clock();
4233         cqr->status = DASD_CQR_FILLED;
4234
4235         rc = dasd_sleep_on_immediatly(cqr);
4236         if (!rc)
4237                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4238
4239         if (useglobal)
4240                 mutex_unlock(&dasd_reserve_mutex);
4241         else
4242                 dasd_sfree_request(cqr, cqr->memdev);
4243         return rc;
4244 }
4245
4246 /*
4247  * Steal lock ioctl - unconditional reserve device.
4248  * Buils a channel programm to break a device's reservation.
4249  * (unconditional reserve)
4250  */
4251 static int
4252 dasd_eckd_steal_lock(struct dasd_device *device)
4253 {
4254         struct dasd_ccw_req *cqr;
4255         int rc;
4256         struct ccw1 *ccw;
4257         int useglobal;
4258
4259         if (!capable(CAP_SYS_ADMIN))
4260                 return -EACCES;
4261
4262         useglobal = 0;
4263         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
4264         if (IS_ERR(cqr)) {
4265                 mutex_lock(&dasd_reserve_mutex);
4266                 useglobal = 1;
4267                 cqr = &dasd_reserve_req->cqr;
4268                 memset(cqr, 0, sizeof(*cqr));
4269                 memset(&dasd_reserve_req->ccw, 0,
4270                        sizeof(dasd_reserve_req->ccw));
4271                 cqr->cpaddr = &dasd_reserve_req->ccw;
4272                 cqr->data = &dasd_reserve_req->data;
4273                 cqr->magic = DASD_ECKD_MAGIC;
4274         }
4275         ccw = cqr->cpaddr;
4276         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
4277         ccw->flags |= CCW_FLAG_SLI;
4278         ccw->count = 32;
4279         ccw->cda = (__u32)(addr_t) cqr->data;
4280         cqr->startdev = device;
4281         cqr->memdev = device;
4282         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4283         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4284         cqr->retries = 2;       /* set retry counter to enable basic ERP */
4285         cqr->expires = 2 * HZ;
4286         cqr->buildclk = get_tod_clock();
4287         cqr->status = DASD_CQR_FILLED;
4288
4289         rc = dasd_sleep_on_immediatly(cqr);
4290         if (!rc)
4291                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4292
4293         if (useglobal)
4294                 mutex_unlock(&dasd_reserve_mutex);
4295         else
4296                 dasd_sfree_request(cqr, cqr->memdev);
4297         return rc;
4298 }
4299
4300 /*
4301  * SNID - Sense Path Group ID
4302  * This ioctl may be used in situations where I/O is stalled due to
4303  * a reserve, so if the normal dasd_smalloc_request fails, we use the
4304  * preallocated dasd_reserve_req.
4305  */
4306 static int dasd_eckd_snid(struct dasd_device *device,
4307                           void __user *argp)
4308 {
4309         struct dasd_ccw_req *cqr;
4310         int rc;
4311         struct ccw1 *ccw;
4312         int useglobal;
4313         struct dasd_snid_ioctl_data usrparm;
4314
4315         if (!capable(CAP_SYS_ADMIN))
4316                 return -EACCES;
4317
4318         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
4319                 return -EFAULT;
4320
4321         useglobal = 0;
4322         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
4323                                    sizeof(struct dasd_snid_data), device);
4324         if (IS_ERR(cqr)) {
4325                 mutex_lock(&dasd_reserve_mutex);
4326                 useglobal = 1;
4327                 cqr = &dasd_reserve_req->cqr;
4328                 memset(cqr, 0, sizeof(*cqr));
4329                 memset(&dasd_reserve_req->ccw, 0,
4330                        sizeof(dasd_reserve_req->ccw));
4331                 cqr->cpaddr = &dasd_reserve_req->ccw;
4332                 cqr->data = &dasd_reserve_req->data;
4333                 cqr->magic = DASD_ECKD_MAGIC;
4334         }
4335         ccw = cqr->cpaddr;
4336         ccw->cmd_code = DASD_ECKD_CCW_SNID;
4337         ccw->flags |= CCW_FLAG_SLI;
4338         ccw->count = 12;
4339         ccw->cda = (__u32)(addr_t) cqr->data;
4340         cqr->startdev = device;
4341         cqr->memdev = device;
4342         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4343         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4344         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
4345         cqr->retries = 5;
4346         cqr->expires = 10 * HZ;
4347         cqr->buildclk = get_tod_clock();
4348         cqr->status = DASD_CQR_FILLED;
4349         cqr->lpm = usrparm.path_mask;
4350
4351         rc = dasd_sleep_on_immediatly(cqr);
4352         /* verify that I/O processing didn't modify the path mask */
4353         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
4354                 rc = -EIO;
4355         if (!rc) {
4356                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
4357                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
4358                         rc = -EFAULT;
4359         }
4360
4361         if (useglobal)
4362                 mutex_unlock(&dasd_reserve_mutex);
4363         else
4364                 dasd_sfree_request(cqr, cqr->memdev);
4365         return rc;
4366 }
4367
4368 /*
4369  * Read performance statistics
4370  */
4371 static int
4372 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
4373 {
4374         struct dasd_psf_prssd_data *prssdp;
4375         struct dasd_rssd_perf_stats_t *stats;
4376         struct dasd_ccw_req *cqr;
4377         struct ccw1 *ccw;
4378         int rc;
4379
4380         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
4381                                    (sizeof(struct dasd_psf_prssd_data) +
4382                                     sizeof(struct dasd_rssd_perf_stats_t)),
4383                                    device);
4384         if (IS_ERR(cqr)) {
4385                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4386                             "Could not allocate initialization request");
4387                 return PTR_ERR(cqr);
4388         }
4389         cqr->startdev = device;
4390         cqr->memdev = device;
4391         cqr->retries = 0;
4392         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4393         cqr->expires = 10 * HZ;
4394
4395         /* Prepare for Read Subsystem Data */
4396         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4397         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
4398         prssdp->order = PSF_ORDER_PRSSD;
4399         prssdp->suborder = 0x01;        /* Performance Statistics */
4400         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
4401
4402         ccw = cqr->cpaddr;
4403         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4404         ccw->count = sizeof(struct dasd_psf_prssd_data);
4405         ccw->flags |= CCW_FLAG_CC;
4406         ccw->cda = (__u32)(addr_t) prssdp;
4407
4408         /* Read Subsystem Data - Performance Statistics */
4409         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
4410         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
4411
4412         ccw++;
4413         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4414         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
4415         ccw->cda = (__u32)(addr_t) stats;
4416
4417         cqr->buildclk = get_tod_clock();
4418         cqr->status = DASD_CQR_FILLED;
4419         rc = dasd_sleep_on(cqr);
4420         if (rc == 0) {
4421                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4422                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
4423                 if (copy_to_user(argp, stats,
4424                                  sizeof(struct dasd_rssd_perf_stats_t)))
4425                         rc = -EFAULT;
4426         }
4427         dasd_sfree_request(cqr, cqr->memdev);
4428         return rc;
4429 }
4430
4431 /*
4432  * Get attributes (cache operations)
4433  * Returnes the cache attributes used in Define Extend (DE).
4434  */
4435 static int
4436 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
4437 {
4438         struct dasd_eckd_private *private = device->private;
4439         struct attrib_data_t attrib = private->attrib;
4440         int rc;
4441
4442         if (!capable(CAP_SYS_ADMIN))
4443                 return -EACCES;
4444         if (!argp)
4445                 return -EINVAL;
4446
4447         rc = 0;
4448         if (copy_to_user(argp, (long *) &attrib,
4449                          sizeof(struct attrib_data_t)))
4450                 rc = -EFAULT;
4451
4452         return rc;
4453 }
4454
4455 /*
4456  * Set attributes (cache operations)
4457  * Stores the attributes for cache operation to be used in Define Extend (DE).
4458  */
4459 static int
4460 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
4461 {
4462         struct dasd_eckd_private *private = device->private;
4463         struct attrib_data_t attrib;
4464
4465         if (!capable(CAP_SYS_ADMIN))
4466                 return -EACCES;
4467         if (!argp)
4468                 return -EINVAL;
4469
4470         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
4471                 return -EFAULT;
4472         private->attrib = attrib;
4473
4474         dev_info(&device->cdev->dev,
4475                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
4476                  private->attrib.operation, private->attrib.nr_cyl);
4477         return 0;
4478 }
4479
4480 /*
4481  * Issue syscall I/O to EMC Symmetrix array.
4482  * CCWs are PSF and RSSD
4483  */
4484 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
4485 {
4486         struct dasd_symmio_parms usrparm;
4487         char *psf_data, *rssd_result;
4488         struct dasd_ccw_req *cqr;
4489         struct ccw1 *ccw;
4490         char psf0, psf1;
4491         int rc;
4492
4493         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
4494                 return -EACCES;
4495         psf0 = psf1 = 0;
4496
4497         /* Copy parms from caller */
4498         rc = -EFAULT;
4499         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
4500                 goto out;
4501         if (is_compat_task()) {
4502                 /* Make sure pointers are sane even on 31 bit. */
4503                 rc = -EINVAL;
4504                 if ((usrparm.psf_data >> 32) != 0)
4505                         goto out;
4506                 if ((usrparm.rssd_result >> 32) != 0)
4507                         goto out;
4508                 usrparm.psf_data &= 0x7fffffffULL;
4509                 usrparm.rssd_result &= 0x7fffffffULL;
4510         }
4511         /* at least 2 bytes are accessed and should be allocated */
4512         if (usrparm.psf_data_len < 2) {
4513                 DBF_DEV_EVENT(DBF_WARNING, device,
4514                               "Symmetrix ioctl invalid data length %d",
4515                               usrparm.psf_data_len);
4516                 rc = -EINVAL;
4517                 goto out;
4518         }
4519         /* alloc I/O data area */
4520         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
4521         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
4522         if (!psf_data || !rssd_result) {
4523                 rc = -ENOMEM;
4524                 goto out_free;
4525         }
4526
4527         /* get syscall header from user space */
4528         rc = -EFAULT;
4529         if (copy_from_user(psf_data,
4530                            (void __user *)(unsigned long) usrparm.psf_data,
4531                            usrparm.psf_data_len))
4532                 goto out_free;
4533         psf0 = psf_data[0];
4534         psf1 = psf_data[1];
4535
4536         /* setup CCWs for PSF + RSSD */
4537         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
4538         if (IS_ERR(cqr)) {
4539                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4540                         "Could not allocate initialization request");
4541                 rc = PTR_ERR(cqr);
4542                 goto out_free;
4543         }
4544
4545         cqr->startdev = device;
4546         cqr->memdev = device;
4547         cqr->retries = 3;
4548         cqr->expires = 10 * HZ;
4549         cqr->buildclk = get_tod_clock();
4550         cqr->status = DASD_CQR_FILLED;
4551
4552         /* Build the ccws */
4553         ccw = cqr->cpaddr;
4554
4555         /* PSF ccw */
4556         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4557         ccw->count = usrparm.psf_data_len;
4558         ccw->flags |= CCW_FLAG_CC;
4559         ccw->cda = (__u32)(addr_t) psf_data;
4560
4561         ccw++;
4562
4563         /* RSSD ccw  */
4564         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4565         ccw->count = usrparm.rssd_result_len;
4566         ccw->flags = CCW_FLAG_SLI ;
4567         ccw->cda = (__u32)(addr_t) rssd_result;
4568
4569         rc = dasd_sleep_on(cqr);
4570         if (rc)
4571                 goto out_sfree;
4572
4573         rc = -EFAULT;
4574         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
4575                            rssd_result, usrparm.rssd_result_len))
4576                 goto out_sfree;
4577         rc = 0;
4578
4579 out_sfree:
4580         dasd_sfree_request(cqr, cqr->memdev);
4581 out_free:
4582         kfree(rssd_result);
4583         kfree(psf_data);
4584 out:
4585         DBF_DEV_EVENT(DBF_WARNING, device,
4586                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
4587                       (int) psf0, (int) psf1, rc);
4588         return rc;
4589 }
4590
4591 static int
4592 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
4593 {
4594         struct dasd_device *device = block->base;
4595
4596         switch (cmd) {
4597         case BIODASDGATTR:
4598                 return dasd_eckd_get_attrib(device, argp);
4599         case BIODASDSATTR:
4600                 return dasd_eckd_set_attrib(device, argp);
4601         case BIODASDPSRD:
4602                 return dasd_eckd_performance(device, argp);
4603         case BIODASDRLSE:
4604                 return dasd_eckd_release(device);
4605         case BIODASDRSRV:
4606                 return dasd_eckd_reserve(device);
4607         case BIODASDSLCK:
4608                 return dasd_eckd_steal_lock(device);
4609         case BIODASDSNID:
4610                 return dasd_eckd_snid(device, argp);
4611         case BIODASDSYMMIO:
4612                 return dasd_symm_io(device, argp);
4613         default:
4614                 return -ENOTTY;
4615         }
4616 }
4617
4618 /*
4619  * Dump the range of CCWs into 'page' buffer
4620  * and return number of printed chars.
4621  */
4622 static int
4623 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
4624 {
4625         int len, count;
4626         char *datap;
4627
4628         len = 0;
4629         while (from <= to) {
4630                 len += sprintf(page + len, PRINTK_HEADER
4631                                " CCW %p: %08X %08X DAT:",
4632                                from, ((int *) from)[0], ((int *) from)[1]);
4633
4634                 /* get pointer to data (consider IDALs) */
4635                 if (from->flags & CCW_FLAG_IDA)
4636                         datap = (char *) *((addr_t *) (addr_t) from->cda);
4637                 else
4638                         datap = (char *) ((addr_t) from->cda);
4639
4640                 /* dump data (max 32 bytes) */
4641                 for (count = 0; count < from->count && count < 32; count++) {
4642                         if (count % 8 == 0) len += sprintf(page + len, " ");
4643                         if (count % 4 == 0) len += sprintf(page + len, " ");
4644                         len += sprintf(page + len, "%02x", datap[count]);
4645                 }
4646                 len += sprintf(page + len, "\n");
4647                 from++;
4648         }
4649         return len;
4650 }
4651
4652 static void
4653 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
4654                          char *reason)
4655 {
4656         u64 *sense;
4657         u64 *stat;
4658
4659         sense = (u64 *) dasd_get_sense(irb);
4660         stat = (u64 *) &irb->scsw;
4661         if (sense) {
4662                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
4663                               "%016llx %016llx %016llx %016llx",
4664                               reason, *stat, *((u32 *) (stat + 1)),
4665                               sense[0], sense[1], sense[2], sense[3]);
4666         } else {
4667                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
4668                               reason, *stat, *((u32 *) (stat + 1)),
4669                               "NO VALID SENSE");
4670         }
4671 }
4672
4673 /*
4674  * Print sense data and related channel program.
4675  * Parts are printed because printk buffer is only 1024 bytes.
4676  */
4677 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
4678                                  struct dasd_ccw_req *req, struct irb *irb)
4679 {
4680         char *page;
4681         struct ccw1 *first, *last, *fail, *from, *to;
4682         int len, sl, sct;
4683
4684         page = (char *) get_zeroed_page(GFP_ATOMIC);
4685         if (page == NULL) {
4686                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4687                               "No memory to dump sense data\n");
4688                 return;
4689         }
4690         /* dump the sense data */
4691         len = sprintf(page, PRINTK_HEADER
4692                       " I/O status report for device %s:\n",
4693                       dev_name(&device->cdev->dev));
4694         len += sprintf(page + len, PRINTK_HEADER
4695                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4696                        "CS:%02X RC:%d\n",
4697                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4698                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4699                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4700                        req ? req->intrc : 0);
4701         len += sprintf(page + len, PRINTK_HEADER
4702                        " device %s: Failing CCW: %p\n",
4703                        dev_name(&device->cdev->dev),
4704                        (void *) (addr_t) irb->scsw.cmd.cpa);
4705         if (irb->esw.esw0.erw.cons) {
4706                 for (sl = 0; sl < 4; sl++) {
4707                         len += sprintf(page + len, PRINTK_HEADER
4708                                        " Sense(hex) %2d-%2d:",
4709                                        (8 * sl), ((8 * sl) + 7));
4710
4711                         for (sct = 0; sct < 8; sct++) {
4712                                 len += sprintf(page + len, " %02x",
4713                                                irb->ecw[8 * sl + sct]);
4714                         }
4715                         len += sprintf(page + len, "\n");
4716                 }
4717
4718                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
4719                         /* 24 Byte Sense Data */
4720                         sprintf(page + len, PRINTK_HEADER
4721                                 " 24 Byte: %x MSG %x, "
4722                                 "%s MSGb to SYSOP\n",
4723                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
4724                                 irb->ecw[1] & 0x10 ? "" : "no");
4725                 } else {
4726                         /* 32 Byte Sense Data */
4727                         sprintf(page + len, PRINTK_HEADER
4728                                 " 32 Byte: Format: %x "
4729                                 "Exception class %x\n",
4730                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
4731                 }
4732         } else {
4733                 sprintf(page + len, PRINTK_HEADER
4734                         " SORRY - NO VALID SENSE AVAILABLE\n");
4735         }
4736         printk(KERN_ERR "%s", page);
4737
4738         if (req) {
4739                 /* req == NULL for unsolicited interrupts */
4740                 /* dump the Channel Program (max 140 Bytes per line) */
4741                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
4742                 first = req->cpaddr;
4743                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
4744                 to = min(first + 6, last);
4745                 len = sprintf(page, PRINTK_HEADER
4746                               " Related CP in req: %p\n", req);
4747                 dasd_eckd_dump_ccw_range(first, to, page + len);
4748                 printk(KERN_ERR "%s", page);
4749
4750                 /* print failing CCW area (maximum 4) */
4751                 /* scsw->cda is either valid or zero  */
4752                 len = 0;
4753                 from = ++to;
4754                 fail = (struct ccw1 *)(addr_t)
4755                                 irb->scsw.cmd.cpa; /* failing CCW */
4756                 if (from <  fail - 2) {
4757                         from = fail - 2;     /* there is a gap - print header */
4758                         len += sprintf(page, PRINTK_HEADER "......\n");
4759                 }
4760                 to = min(fail + 1, last);
4761                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
4762
4763                 /* print last CCWs (maximum 2) */
4764                 from = max(from, ++to);
4765                 if (from < last - 1) {
4766                         from = last - 1;     /* there is a gap - print header */
4767                         len += sprintf(page + len, PRINTK_HEADER "......\n");
4768                 }
4769                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
4770                 if (len > 0)
4771                         printk(KERN_ERR "%s", page);
4772         }
4773         free_page((unsigned long) page);
4774 }
4775
4776
4777 /*
4778  * Print sense data from a tcw.
4779  */
4780 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4781                                  struct dasd_ccw_req *req, struct irb *irb)
4782 {
4783         char *page;
4784         int len, sl, sct, residual;
4785         struct tsb *tsb;
4786         u8 *sense, *rcq;
4787
4788         page = (char *) get_zeroed_page(GFP_ATOMIC);
4789         if (page == NULL) {
4790                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4791                             "No memory to dump sense data");
4792                 return;
4793         }
4794         /* dump the sense data */
4795         len = sprintf(page, PRINTK_HEADER
4796                       " I/O status report for device %s:\n",
4797                       dev_name(&device->cdev->dev));
4798         len += sprintf(page + len, PRINTK_HEADER
4799                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4800                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4801                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4802                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4803                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4804                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
4805                        req ? req->intrc : 0);
4806         len += sprintf(page + len, PRINTK_HEADER
4807                        " device %s: Failing TCW: %p\n",
4808                        dev_name(&device->cdev->dev),
4809                        (void *) (addr_t) irb->scsw.tm.tcw);
4810
4811         tsb = NULL;
4812         sense = NULL;
4813         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4814                 tsb = tcw_get_tsb(
4815                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4816
4817         if (tsb) {
4818                 len += sprintf(page + len, PRINTK_HEADER
4819                                " tsb->length %d\n", tsb->length);
4820                 len += sprintf(page + len, PRINTK_HEADER
4821                                " tsb->flags %x\n", tsb->flags);
4822                 len += sprintf(page + len, PRINTK_HEADER
4823                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
4824                 len += sprintf(page + len, PRINTK_HEADER
4825                                " tsb->count %d\n", tsb->count);
4826                 residual = tsb->count - 28;
4827                 len += sprintf(page + len, PRINTK_HEADER
4828                                " residual %d\n", residual);
4829
4830                 switch (tsb->flags & 0x07) {
4831                 case 1: /* tsa_iostat */
4832                         len += sprintf(page + len, PRINTK_HEADER
4833                                " tsb->tsa.iostat.dev_time %d\n",
4834                                        tsb->tsa.iostat.dev_time);
4835                         len += sprintf(page + len, PRINTK_HEADER
4836                                " tsb->tsa.iostat.def_time %d\n",
4837                                        tsb->tsa.iostat.def_time);
4838                         len += sprintf(page + len, PRINTK_HEADER
4839                                " tsb->tsa.iostat.queue_time %d\n",
4840                                        tsb->tsa.iostat.queue_time);
4841                         len += sprintf(page + len, PRINTK_HEADER
4842                                " tsb->tsa.iostat.dev_busy_time %d\n",
4843                                        tsb->tsa.iostat.dev_busy_time);
4844                         len += sprintf(page + len, PRINTK_HEADER
4845                                " tsb->tsa.iostat.dev_act_time %d\n",
4846                                        tsb->tsa.iostat.dev_act_time);
4847                         sense = tsb->tsa.iostat.sense;
4848                         break;
4849                 case 2: /* ts_ddpc */
4850                         len += sprintf(page + len, PRINTK_HEADER
4851                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4852                         for (sl = 0; sl < 2; sl++) {
4853                                 len += sprintf(page + len, PRINTK_HEADER
4854                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
4855                                                (8 * sl), ((8 * sl) + 7));
4856                                 rcq = tsb->tsa.ddpc.rcq;
4857                                 for (sct = 0; sct < 8; sct++) {
4858                                         len += sprintf(page + len, " %02x",
4859                                                        rcq[8 * sl + sct]);
4860                                 }
4861                                 len += sprintf(page + len, "\n");
4862                         }
4863                         sense = tsb->tsa.ddpc.sense;
4864                         break;
4865                 case 3: /* tsa_intrg */
4866                         len += sprintf(page + len, PRINTK_HEADER
4867                                       " tsb->tsa.intrg.: not supportet yet\n");
4868                         break;
4869                 }
4870
4871                 if (sense) {
4872                         for (sl = 0; sl < 4; sl++) {
4873                                 len += sprintf(page + len, PRINTK_HEADER
4874                                                " Sense(hex) %2d-%2d:",
4875                                                (8 * sl), ((8 * sl) + 7));
4876                                 for (sct = 0; sct < 8; sct++) {
4877                                         len += sprintf(page + len, " %02x",
4878                                                        sense[8 * sl + sct]);
4879                                 }
4880                                 len += sprintf(page + len, "\n");
4881                         }
4882
4883                         if (sense[27] & DASD_SENSE_BIT_0) {
4884                                 /* 24 Byte Sense Data */
4885                                 sprintf(page + len, PRINTK_HEADER
4886                                         " 24 Byte: %x MSG %x, "
4887                                         "%s MSGb to SYSOP\n",
4888                                         sense[7] >> 4, sense[7] & 0x0f,
4889                                         sense[1] & 0x10 ? "" : "no");
4890                         } else {
4891                                 /* 32 Byte Sense Data */
4892                                 sprintf(page + len, PRINTK_HEADER
4893                                         " 32 Byte: Format: %x "
4894                                         "Exception class %x\n",
4895                                         sense[6] & 0x0f, sense[22] >> 4);
4896                         }
4897                 } else {
4898                         sprintf(page + len, PRINTK_HEADER
4899                                 " SORRY - NO VALID SENSE AVAILABLE\n");
4900                 }
4901         } else {
4902                 sprintf(page + len, PRINTK_HEADER
4903                         " SORRY - NO TSB DATA AVAILABLE\n");
4904         }
4905         printk(KERN_ERR "%s", page);
4906         free_page((unsigned long) page);
4907 }
4908
4909 static void dasd_eckd_dump_sense(struct dasd_device *device,
4910                                  struct dasd_ccw_req *req, struct irb *irb)
4911 {
4912         u8 *sense = dasd_get_sense(irb);
4913
4914         if (scsw_is_tm(&irb->scsw)) {
4915                 /*
4916                  * In some cases the 'File Protected' or 'Incorrect Length'
4917                  * error might be expected and log messages shouldn't be written
4918                  * then. Check if the according suppress bit is set.
4919                  */
4920                 if (sense && (sense[1] & SNS1_FILE_PROTECTED) &&
4921                     test_bit(DASD_CQR_SUPPRESS_FP, &req->flags))
4922                         return;
4923                 if (scsw_cstat(&irb->scsw) == 0x40 &&
4924                     test_bit(DASD_CQR_SUPPRESS_IL, &req->flags))
4925                         return;
4926
4927                 dasd_eckd_dump_sense_tcw(device, req, irb);
4928         } else {
4929                 /*
4930                  * In some cases the 'No Record Found' error might be expected
4931                  * and log messages shouldn't be written then. Check if the
4932                  * according suppress bit is set.
4933                  */
4934                 if (sense && sense[1] & SNS1_NO_REC_FOUND &&
4935                     test_bit(DASD_CQR_SUPPRESS_NRF, &req->flags))
4936                         return;
4937
4938                 dasd_eckd_dump_sense_ccw(device, req, irb);
4939         }
4940 }
4941
4942 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4943 {
4944         /*
4945          * the device should be disconnected from our LCU structure
4946          * on restore we will reconnect it and reread LCU specific
4947          * information like PAV support that might have changed
4948          */
4949         dasd_alias_remove_device(device);
4950         dasd_alias_disconnect_device_from_lcu(device);
4951
4952         return 0;
4953 }
4954
4955 static int dasd_eckd_restore_device(struct dasd_device *device)
4956 {
4957         struct dasd_eckd_private *private = device->private;
4958         struct dasd_eckd_characteristics temp_rdc_data;
4959         int rc;
4960         struct dasd_uid temp_uid;
4961         unsigned long flags;
4962         unsigned long cqr_flags = 0;
4963
4964         /* Read Configuration Data */
4965         rc = dasd_eckd_read_conf(device);
4966         if (rc) {
4967                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4968                                 "Read configuration data failed, rc=%d", rc);
4969                 goto out_err;
4970         }
4971
4972         dasd_eckd_get_uid(device, &temp_uid);
4973         /* Generate device unique id */
4974         rc = dasd_eckd_generate_uid(device);
4975         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4976         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4977                 dev_err(&device->cdev->dev, "The UID of the DASD has "
4978                         "changed\n");
4979         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4980         if (rc)
4981                 goto out_err;
4982
4983         /* register lcu with alias handling, enable PAV if this is a new lcu */
4984         rc = dasd_alias_make_device_known_to_lcu(device);
4985         if (rc)
4986                 goto out_err;
4987
4988         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
4989         dasd_eckd_validate_server(device, cqr_flags);
4990
4991         /* RE-Read Configuration Data */
4992         rc = dasd_eckd_read_conf(device);
4993         if (rc) {
4994                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4995                         "Read configuration data failed, rc=%d", rc);
4996                 goto out_err2;
4997         }
4998
4999         /* Read Feature Codes */
5000         dasd_eckd_read_features(device);
5001
5002         /* Read Device Characteristics */
5003         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
5004                                          &temp_rdc_data, 64);
5005         if (rc) {
5006                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5007                                 "Read device characteristic failed, rc=%d", rc);
5008                 goto out_err2;
5009         }
5010         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
5011         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
5012         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
5013
5014         /* add device to alias management */
5015         dasd_alias_add_device(device);
5016
5017         return 0;
5018
5019 out_err2:
5020         dasd_alias_disconnect_device_from_lcu(device);
5021 out_err:
5022         return -1;
5023 }
5024
5025 static int dasd_eckd_reload_device(struct dasd_device *device)
5026 {
5027         struct dasd_eckd_private *private = device->private;
5028         int rc, old_base;
5029         char print_uid[60];
5030         struct dasd_uid uid;
5031         unsigned long flags;
5032
5033         /*
5034          * remove device from alias handling to prevent new requests
5035          * from being scheduled on the wrong alias device
5036          */
5037         dasd_alias_remove_device(device);
5038
5039         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
5040         old_base = private->uid.base_unit_addr;
5041         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
5042
5043         /* Read Configuration Data */
5044         rc = dasd_eckd_read_conf(device);
5045         if (rc)
5046                 goto out_err;
5047
5048         rc = dasd_eckd_generate_uid(device);
5049         if (rc)
5050                 goto out_err;
5051         /*
5052          * update unit address configuration and
5053          * add device to alias management
5054          */
5055         dasd_alias_update_add_device(device);
5056
5057         dasd_eckd_get_uid(device, &uid);
5058
5059         if (old_base != uid.base_unit_addr) {
5060                 if (strlen(uid.vduit) > 0)
5061                         snprintf(print_uid, sizeof(print_uid),
5062                                  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
5063                                  uid.ssid, uid.base_unit_addr, uid.vduit);
5064                 else
5065                         snprintf(print_uid, sizeof(print_uid),
5066                                  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
5067                                  uid.ssid, uid.base_unit_addr);
5068
5069                 dev_info(&device->cdev->dev,
5070                          "An Alias device was reassigned to a new base device "
5071                          "with UID: %s\n", print_uid);
5072         }
5073         return 0;
5074
5075 out_err:
5076         return -1;
5077 }
5078
5079 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
5080                                          struct dasd_rssd_messages *messages,
5081                                          __u8 lpum)
5082 {
5083         struct dasd_rssd_messages *message_buf;
5084         struct dasd_psf_prssd_data *prssdp;
5085         struct dasd_ccw_req *cqr;
5086         struct ccw1 *ccw;
5087         int rc;
5088
5089         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5090                                    (sizeof(struct dasd_psf_prssd_data) +
5091                                     sizeof(struct dasd_rssd_messages)),
5092                                    device);
5093         if (IS_ERR(cqr)) {
5094                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5095                                 "Could not allocate read message buffer request");
5096                 return PTR_ERR(cqr);
5097         }
5098
5099         cqr->lpm = lpum;
5100 retry:
5101         cqr->startdev = device;
5102         cqr->memdev = device;
5103         cqr->block = NULL;
5104         cqr->expires = 10 * HZ;
5105         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5106         /* dasd_sleep_on_immediatly does not do complex error
5107          * recovery so clear erp flag and set retry counter to
5108          * do basic erp */
5109         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5110         cqr->retries = 256;
5111
5112         /* Prepare for Read Subsystem Data */
5113         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5114         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5115         prssdp->order = PSF_ORDER_PRSSD;
5116         prssdp->suborder = 0x03;        /* Message Buffer */
5117         /* all other bytes of prssdp must be zero */
5118
5119         ccw = cqr->cpaddr;
5120         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5121         ccw->count = sizeof(struct dasd_psf_prssd_data);
5122         ccw->flags |= CCW_FLAG_CC;
5123         ccw->flags |= CCW_FLAG_SLI;
5124         ccw->cda = (__u32)(addr_t) prssdp;
5125
5126         /* Read Subsystem Data - message buffer */
5127         message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
5128         memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
5129
5130         ccw++;
5131         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5132         ccw->count = sizeof(struct dasd_rssd_messages);
5133         ccw->flags |= CCW_FLAG_SLI;
5134         ccw->cda = (__u32)(addr_t) message_buf;
5135
5136         cqr->buildclk = get_tod_clock();
5137         cqr->status = DASD_CQR_FILLED;
5138         rc = dasd_sleep_on_immediatly(cqr);
5139         if (rc == 0) {
5140                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5141                 message_buf = (struct dasd_rssd_messages *)
5142                         (prssdp + 1);
5143                 memcpy(messages, message_buf,
5144                        sizeof(struct dasd_rssd_messages));
5145         } else if (cqr->lpm) {
5146                 /*
5147                  * on z/VM we might not be able to do I/O on the requested path
5148                  * but instead we get the required information on any path
5149                  * so retry with open path mask
5150                  */
5151                 cqr->lpm = 0;
5152                 goto retry;
5153         } else
5154                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5155                                 "Reading messages failed with rc=%d\n"
5156                                 , rc);
5157         dasd_sfree_request(cqr, cqr->memdev);
5158         return rc;
5159 }
5160
5161 static int dasd_eckd_query_host_access(struct dasd_device *device,
5162                                        struct dasd_psf_query_host_access *data)
5163 {
5164         struct dasd_eckd_private *private = device->private;
5165         struct dasd_psf_query_host_access *host_access;
5166         struct dasd_psf_prssd_data *prssdp;
5167         struct dasd_ccw_req *cqr;
5168         struct ccw1 *ccw;
5169         int rc;
5170
5171         /* not available for HYPER PAV alias devices */
5172         if (!device->block && private->lcu->pav == HYPER_PAV)
5173                 return -EOPNOTSUPP;
5174
5175         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5176                                    sizeof(struct dasd_psf_prssd_data) + 1,
5177                                    device);
5178         if (IS_ERR(cqr)) {
5179                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5180                                 "Could not allocate read message buffer request");
5181                 return PTR_ERR(cqr);
5182         }
5183         host_access = kzalloc(sizeof(*host_access), GFP_KERNEL | GFP_DMA);
5184         if (!host_access) {
5185                 dasd_sfree_request(cqr, device);
5186                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5187                                 "Could not allocate host_access buffer");
5188                 return -ENOMEM;
5189         }
5190         cqr->startdev = device;
5191         cqr->memdev = device;
5192         cqr->block = NULL;
5193         cqr->retries = 256;
5194         cqr->expires = 10 * HZ;
5195
5196         /* Prepare for Read Subsystem Data */
5197         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5198         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5199         prssdp->order = PSF_ORDER_PRSSD;
5200         prssdp->suborder = PSF_SUBORDER_QHA;    /* query host access */
5201         /* LSS and Volume that will be queried */
5202         prssdp->lss = private->ned->ID;
5203         prssdp->volume = private->ned->unit_addr;
5204         /* all other bytes of prssdp must be zero */
5205
5206         ccw = cqr->cpaddr;
5207         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5208         ccw->count = sizeof(struct dasd_psf_prssd_data);
5209         ccw->flags |= CCW_FLAG_CC;
5210         ccw->flags |= CCW_FLAG_SLI;
5211         ccw->cda = (__u32)(addr_t) prssdp;
5212
5213         /* Read Subsystem Data - query host access */
5214         ccw++;
5215         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5216         ccw->count = sizeof(struct dasd_psf_query_host_access);
5217         ccw->flags |= CCW_FLAG_SLI;
5218         ccw->cda = (__u32)(addr_t) host_access;
5219
5220         cqr->buildclk = get_tod_clock();
5221         cqr->status = DASD_CQR_FILLED;
5222         rc = dasd_sleep_on_interruptible(cqr);
5223         if (rc == 0) {
5224                 *data = *host_access;
5225         } else {
5226                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5227                                 "Reading host access data failed with rc=%d\n",
5228                                 rc);
5229                 rc = -EOPNOTSUPP;
5230         }
5231
5232         dasd_sfree_request(cqr, cqr->memdev);
5233         kfree(host_access);
5234         return rc;
5235 }
5236 /*
5237  * return number of grouped devices
5238  */
5239 static int dasd_eckd_host_access_count(struct dasd_device *device)
5240 {
5241         struct dasd_psf_query_host_access *access;
5242         struct dasd_ckd_path_group_entry *entry;
5243         struct dasd_ckd_host_information *info;
5244         int count = 0;
5245         int rc, i;
5246
5247         access = kzalloc(sizeof(*access), GFP_NOIO);
5248         if (!access) {
5249                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5250                                 "Could not allocate access buffer");
5251                 return -ENOMEM;
5252         }
5253         rc = dasd_eckd_query_host_access(device, access);
5254         if (rc) {
5255                 kfree(access);
5256                 return rc;
5257         }
5258
5259         info = (struct dasd_ckd_host_information *)
5260                 access->host_access_information;
5261         for (i = 0; i < info->entry_count; i++) {
5262                 entry = (struct dasd_ckd_path_group_entry *)
5263                         (info->entry + i * info->entry_size);
5264                 if (entry->status_flags & DASD_ECKD_PG_GROUPED)
5265                         count++;
5266         }
5267
5268         kfree(access);
5269         return count;
5270 }
5271
5272 /*
5273  * write host access information to a sequential file
5274  */
5275 static int dasd_hosts_print(struct dasd_device *device, struct seq_file *m)
5276 {
5277         struct dasd_psf_query_host_access *access;
5278         struct dasd_ckd_path_group_entry *entry;
5279         struct dasd_ckd_host_information *info;
5280         char sysplex[9] = "";
5281         int rc, i, j;
5282
5283         access = kzalloc(sizeof(*access), GFP_NOIO);
5284         if (!access) {
5285                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5286                                 "Could not allocate access buffer");
5287                 return -ENOMEM;
5288         }
5289         rc = dasd_eckd_query_host_access(device, access);
5290         if (rc) {
5291                 kfree(access);
5292                 return rc;
5293         }
5294
5295         info = (struct dasd_ckd_host_information *)
5296                 access->host_access_information;
5297         for (i = 0; i < info->entry_count; i++) {
5298                 entry = (struct dasd_ckd_path_group_entry *)
5299                         (info->entry + i * info->entry_size);
5300                 /* PGID */
5301                 seq_puts(m, "pgid ");
5302                 for (j = 0; j < 11; j++)
5303                         seq_printf(m, "%02x", entry->pgid[j]);
5304                 seq_putc(m, '\n');
5305                 /* FLAGS */
5306                 seq_printf(m, "status_flags %02x\n", entry->status_flags);
5307                 /* SYSPLEX NAME */
5308                 memcpy(&sysplex, &entry->sysplex_name, sizeof(sysplex) - 1);
5309                 EBCASC(sysplex, sizeof(sysplex));
5310                 seq_printf(m, "sysplex_name %8s\n", sysplex);
5311                 /* SUPPORTED CYLINDER */
5312                 seq_printf(m, "supported_cylinder %d\n", entry->cylinder);
5313                 /* TIMESTAMP */
5314                 seq_printf(m, "timestamp %lu\n", (unsigned long)
5315                            entry->timestamp);
5316         }
5317         kfree(access);
5318
5319         return 0;
5320 }
5321
5322 /*
5323  * Perform Subsystem Function - CUIR response
5324  */
5325 static int
5326 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
5327                             __u32 message_id,
5328                             struct channel_path_desc *desc,
5329                             struct subchannel_id sch_id)
5330 {
5331         struct dasd_psf_cuir_response *psf_cuir;
5332         struct dasd_ccw_req *cqr;
5333         struct ccw1 *ccw;
5334         int rc;
5335
5336         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
5337                                   sizeof(struct dasd_psf_cuir_response),
5338                                   device);
5339
5340         if (IS_ERR(cqr)) {
5341                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5342                            "Could not allocate PSF-CUIR request");
5343                 return PTR_ERR(cqr);
5344         }
5345
5346         psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
5347         psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
5348         psf_cuir->cc = response;
5349         if (desc)
5350                 psf_cuir->chpid = desc->chpid;
5351         psf_cuir->message_id = message_id;
5352         psf_cuir->cssid = sch_id.cssid;
5353         psf_cuir->ssid = sch_id.ssid;
5354         ccw = cqr->cpaddr;
5355         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5356         ccw->cda = (__u32)(addr_t)psf_cuir;
5357         ccw->flags = CCW_FLAG_SLI;
5358         ccw->count = sizeof(struct dasd_psf_cuir_response);
5359
5360         cqr->startdev = device;
5361         cqr->memdev = device;
5362         cqr->block = NULL;
5363         cqr->retries = 256;
5364         cqr->expires = 10*HZ;
5365         cqr->buildclk = get_tod_clock();
5366         cqr->status = DASD_CQR_FILLED;
5367         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5368
5369         rc = dasd_sleep_on(cqr);
5370
5371         dasd_sfree_request(cqr, cqr->memdev);
5372         return rc;
5373 }
5374
5375 /*
5376  * return configuration data that is referenced by record selector
5377  * if a record selector is specified or per default return the
5378  * conf_data pointer for the path specified by lpum
5379  */
5380 static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
5381                                                      __u8 lpum,
5382                                                      struct dasd_cuir_message *cuir)
5383 {
5384         struct dasd_eckd_private *private = device->private;
5385         struct dasd_conf_data *conf_data;
5386         int path, pos;
5387
5388         if (cuir->record_selector == 0)
5389                 goto out;
5390         for (path = 0x80, pos = 0; path; path >>= 1, pos++) {
5391                 conf_data = private->path_conf_data[pos];
5392                 if (conf_data->gneq.record_selector ==
5393                     cuir->record_selector)
5394                         return conf_data;
5395         }
5396 out:
5397         return private->path_conf_data[pathmask_to_pos(lpum)];
5398 }
5399
5400 /*
5401  * This function determines the scope of a reconfiguration request by
5402  * analysing the path and device selection data provided in the CUIR request.
5403  * Returns a path mask containing CUIR affected paths for the give device.
5404  *
5405  * If the CUIR request does not contain the required information return the
5406  * path mask of the path the attention message for the CUIR request was reveived
5407  * on.
5408  */
5409 static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
5410                                 struct dasd_cuir_message *cuir)
5411 {
5412         struct dasd_eckd_private *private = device->private;
5413         struct dasd_conf_data *ref_conf_data;
5414         unsigned long bitmask = 0, mask = 0;
5415         struct dasd_conf_data *conf_data;
5416         unsigned int pos, path;
5417         char *ref_gneq, *gneq;
5418         char *ref_ned, *ned;
5419         int tbcpm = 0;
5420
5421         /* if CUIR request does not specify the scope use the path
5422            the attention message was presented on */
5423         if (!cuir->ned_map ||
5424             !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2]))
5425                 return lpum;
5426
5427         /* get reference conf data */
5428         ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir);
5429         /* reference ned is determined by ned_map field */
5430         pos = 8 - ffs(cuir->ned_map);
5431         ref_ned = (char *)&ref_conf_data->neds[pos];
5432         ref_gneq = (char *)&ref_conf_data->gneq;
5433         /* transfer 24 bit neq_map to mask */
5434         mask = cuir->neq_map[2];
5435         mask |= cuir->neq_map[1] << 8;
5436         mask |= cuir->neq_map[0] << 16;
5437
5438         for (path = 0x80; path; path >>= 1) {
5439                 /* initialise data per path */
5440                 bitmask = mask;
5441                 pos = pathmask_to_pos(path);
5442                 conf_data = private->path_conf_data[pos];
5443                 pos = 8 - ffs(cuir->ned_map);
5444                 ned = (char *) &conf_data->neds[pos];
5445                 /* compare reference ned and per path ned */
5446                 if (memcmp(ref_ned, ned, sizeof(*ned)) != 0)
5447                         continue;
5448                 gneq = (char *)&conf_data->gneq;
5449                 /* compare reference gneq and per_path gneq under
5450                    24 bit mask where mask bit 0 equals byte 7 of
5451                    the gneq and mask bit 24 equals byte 31 */
5452                 while (bitmask) {
5453                         pos = ffs(bitmask) - 1;
5454                         if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1)
5455                             != 0)
5456                                 break;
5457                         clear_bit(pos, &bitmask);
5458                 }
5459                 if (bitmask)
5460                         continue;
5461                 /* device and path match the reference values
5462                    add path to CUIR scope */
5463                 tbcpm |= path;
5464         }
5465         return tbcpm;
5466 }
5467
5468 static void dasd_eckd_cuir_notify_user(struct dasd_device *device,
5469                                        unsigned long paths,
5470                                        struct subchannel_id sch_id, int action)
5471 {
5472         struct channel_path_desc *desc;
5473         int pos;
5474
5475         while (paths) {
5476                 /* get position of bit in mask */
5477                 pos = ffs(paths) - 1;
5478                 /* get channel path descriptor from this position */
5479                 desc = ccw_device_get_chp_desc(device->cdev, 7 - pos);
5480                 if (action == CUIR_QUIESCE)
5481                         pr_warn("Service on the storage server caused path "
5482                                 "%x.%02x to go offline", sch_id.cssid,
5483                                 desc ? desc->chpid : 0);
5484                 else if (action == CUIR_RESUME)
5485                         pr_info("Path %x.%02x is back online after service "
5486                                 "on the storage server", sch_id.cssid,
5487                                 desc ? desc->chpid : 0);
5488                 kfree(desc);
5489                 clear_bit(pos, &paths);
5490         }
5491 }
5492
5493 static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum,
5494                                       struct dasd_cuir_message *cuir)
5495 {
5496         unsigned long tbcpm;
5497
5498         tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir);
5499         /* nothing to do if path is not in use */
5500         if (!(device->path_data.opm & tbcpm))
5501                 return 0;
5502         if (!(device->path_data.opm & ~tbcpm)) {
5503                 /* no path would be left if the CUIR action is taken
5504                    return error */
5505                 return -EINVAL;
5506         }
5507         /* remove device from operational path mask */
5508         device->path_data.opm &= ~tbcpm;
5509         device->path_data.cuirpm |= tbcpm;
5510         return tbcpm;
5511 }
5512
5513 /*
5514  * walk through all devices and build a path mask to quiesce them
5515  * return an error if the last path to a device would be removed
5516  *
5517  * if only part of the devices are quiesced and an error
5518  * occurs no onlining necessary, the storage server will
5519  * notify the already set offline devices again
5520  */
5521 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
5522                                   struct subchannel_id sch_id,
5523                                   struct dasd_cuir_message *cuir)
5524 {
5525         struct dasd_eckd_private *private = device->private;
5526         struct alias_pav_group *pavgroup, *tempgroup;
5527         struct dasd_device *dev, *n;
5528         unsigned long paths = 0;
5529         unsigned long flags;
5530         int tbcpm;
5531
5532         /* active devices */
5533         list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
5534                                  alias_list) {
5535                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5536                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5537                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
5538                 if (tbcpm < 0)
5539                         goto out_err;
5540                 paths |= tbcpm;
5541         }
5542         /* inactive devices */
5543         list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
5544                                  alias_list) {
5545                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5546                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5547                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
5548                 if (tbcpm < 0)
5549                         goto out_err;
5550                 paths |= tbcpm;
5551         }
5552         /* devices in PAV groups */
5553         list_for_each_entry_safe(pavgroup, tempgroup,
5554                                  &private->lcu->grouplist, group) {
5555                 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
5556                                          alias_list) {
5557                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5558                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5559                         spin_unlock_irqrestore(
5560                                 get_ccwdev_lock(dev->cdev), flags);
5561                         if (tbcpm < 0)
5562                                 goto out_err;
5563                         paths |= tbcpm;
5564                 }
5565                 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
5566                                          alias_list) {
5567                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5568                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5569                         spin_unlock_irqrestore(
5570                                 get_ccwdev_lock(dev->cdev), flags);
5571                         if (tbcpm < 0)
5572                                 goto out_err;
5573                         paths |= tbcpm;
5574                 }
5575         }
5576         /* notify user about all paths affected by CUIR action */
5577         dasd_eckd_cuir_notify_user(device, paths, sch_id, CUIR_QUIESCE);
5578         return 0;
5579 out_err:
5580         return tbcpm;
5581 }
5582
5583 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
5584                                  struct subchannel_id sch_id,
5585                                  struct dasd_cuir_message *cuir)
5586 {
5587         struct dasd_eckd_private *private = device->private;
5588         struct alias_pav_group *pavgroup, *tempgroup;
5589         struct dasd_device *dev, *n;
5590         unsigned long paths = 0;
5591         int tbcpm;
5592
5593         /*
5594          * the path may have been added through a generic path event before
5595          * only trigger path verification if the path is not already in use
5596          */
5597         list_for_each_entry_safe(dev, n,
5598                                  &private->lcu->active_devices,
5599                                  alias_list) {
5600                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5601                 paths |= tbcpm;
5602                 if (!(dev->path_data.opm & tbcpm)) {
5603                         dev->path_data.tbvpm |= tbcpm;
5604                         dasd_schedule_device_bh(dev);
5605                 }
5606         }
5607         list_for_each_entry_safe(dev, n,
5608                                  &private->lcu->inactive_devices,
5609                                  alias_list) {
5610                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5611                 paths |= tbcpm;
5612                 if (!(dev->path_data.opm & tbcpm)) {
5613                         dev->path_data.tbvpm |= tbcpm;
5614                         dasd_schedule_device_bh(dev);
5615                 }
5616         }
5617         /* devices in PAV groups */
5618         list_for_each_entry_safe(pavgroup, tempgroup,
5619                                  &private->lcu->grouplist,
5620                                  group) {
5621                 list_for_each_entry_safe(dev, n,
5622                                          &pavgroup->baselist,
5623                                          alias_list) {
5624                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5625                         paths |= tbcpm;
5626                         if (!(dev->path_data.opm & tbcpm)) {
5627                                 dev->path_data.tbvpm |= tbcpm;
5628                                 dasd_schedule_device_bh(dev);
5629                         }
5630                 }
5631                 list_for_each_entry_safe(dev, n,
5632                                          &pavgroup->aliaslist,
5633                                          alias_list) {
5634                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5635                         paths |= tbcpm;
5636                         if (!(dev->path_data.opm & tbcpm)) {
5637                                 dev->path_data.tbvpm |= tbcpm;
5638                                 dasd_schedule_device_bh(dev);
5639                         }
5640                 }
5641         }
5642         /* notify user about all paths affected by CUIR action */
5643         dasd_eckd_cuir_notify_user(device, paths, sch_id, CUIR_RESUME);
5644         return 0;
5645 }
5646
5647 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
5648                                  __u8 lpum)
5649 {
5650         struct dasd_cuir_message *cuir = messages;
5651         struct channel_path_desc *desc;
5652         struct subchannel_id sch_id;
5653         int pos, response;
5654
5655         DBF_DEV_EVENT(DBF_WARNING, device,
5656                       "CUIR request: %016llx %016llx %016llx %08x",
5657                       ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
5658                       ((u32 *)cuir)[3]);
5659         ccw_device_get_schid(device->cdev, &sch_id);
5660         pos = pathmask_to_pos(lpum);
5661         desc = ccw_device_get_chp_desc(device->cdev, pos);
5662
5663         if (cuir->code == CUIR_QUIESCE) {
5664                 /* quiesce */
5665                 if (dasd_eckd_cuir_quiesce(device, lpum, sch_id, cuir))
5666                         response = PSF_CUIR_LAST_PATH;
5667                 else
5668                         response = PSF_CUIR_COMPLETED;
5669         } else if (cuir->code == CUIR_RESUME) {
5670                 /* resume */
5671                 dasd_eckd_cuir_resume(device, lpum, sch_id, cuir);
5672                 response = PSF_CUIR_COMPLETED;
5673         } else
5674                 response = PSF_CUIR_NOT_SUPPORTED;
5675
5676         dasd_eckd_psf_cuir_response(device, response,
5677                                     cuir->message_id, desc, sch_id);
5678         DBF_DEV_EVENT(DBF_WARNING, device,
5679                       "CUIR response: %d on message ID %08x", response,
5680                       cuir->message_id);
5681         /* free descriptor copy */
5682         kfree(desc);
5683         /* to make sure there is no attention left schedule work again */
5684         device->discipline->check_attention(device, lpum);
5685 }
5686
5687 static void dasd_eckd_check_attention_work(struct work_struct *work)
5688 {
5689         struct check_attention_work_data *data;
5690         struct dasd_rssd_messages *messages;
5691         struct dasd_device *device;
5692         int rc;
5693
5694         data = container_of(work, struct check_attention_work_data, worker);
5695         device = data->device;
5696         messages = kzalloc(sizeof(*messages), GFP_KERNEL);
5697         if (!messages) {
5698                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5699                               "Could not allocate attention message buffer");
5700                 goto out;
5701         }
5702         rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
5703         if (rc)
5704                 goto out;
5705         if (messages->length == ATTENTION_LENGTH_CUIR &&
5706             messages->format == ATTENTION_FORMAT_CUIR)
5707                 dasd_eckd_handle_cuir(device, messages, data->lpum);
5708 out:
5709         dasd_put_device(device);
5710         kfree(messages);
5711         kfree(data);
5712 }
5713
5714 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
5715 {
5716         struct check_attention_work_data *data;
5717
5718         data = kzalloc(sizeof(*data), GFP_ATOMIC);
5719         if (!data)
5720                 return -ENOMEM;
5721         INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
5722         dasd_get_device(device);
5723         data->device = device;
5724         data->lpum = lpum;
5725         schedule_work(&data->worker);
5726         return 0;
5727 }
5728
5729 static struct ccw_driver dasd_eckd_driver = {
5730         .driver = {
5731                 .name   = "dasd-eckd",
5732                 .owner  = THIS_MODULE,
5733         },
5734         .ids         = dasd_eckd_ids,
5735         .probe       = dasd_eckd_probe,
5736         .remove      = dasd_generic_remove,
5737         .set_offline = dasd_generic_set_offline,
5738         .set_online  = dasd_eckd_set_online,
5739         .notify      = dasd_generic_notify,
5740         .path_event  = dasd_generic_path_event,
5741         .shutdown    = dasd_generic_shutdown,
5742         .freeze      = dasd_generic_pm_freeze,
5743         .thaw        = dasd_generic_restore_device,
5744         .restore     = dasd_generic_restore_device,
5745         .uc_handler  = dasd_generic_uc_handler,
5746         .int_class   = IRQIO_DAS,
5747 };
5748
5749 /*
5750  * max_blocks is dependent on the amount of storage that is available
5751  * in the static io buffer for each device. Currently each device has
5752  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
5753  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
5754  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
5755  * addition we have one define extent ccw + 16 bytes of data and one
5756  * locate record ccw + 16 bytes of data. That makes:
5757  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
5758  * We want to fit two into the available memory so that we can immediately
5759  * start the next request if one finishes off. That makes 249.5 blocks
5760  * for one request. Give a little safety and the result is 240.
5761  */
5762 static struct dasd_discipline dasd_eckd_discipline = {
5763         .owner = THIS_MODULE,
5764         .name = "ECKD",
5765         .ebcname = "ECKD",
5766         .max_blocks = 190,
5767         .check_device = dasd_eckd_check_characteristics,
5768         .uncheck_device = dasd_eckd_uncheck_device,
5769         .do_analysis = dasd_eckd_do_analysis,
5770         .verify_path = dasd_eckd_verify_path,
5771         .basic_to_ready = dasd_eckd_basic_to_ready,
5772         .online_to_ready = dasd_eckd_online_to_ready,
5773         .basic_to_known = dasd_eckd_basic_to_known,
5774         .fill_geometry = dasd_eckd_fill_geometry,
5775         .start_IO = dasd_start_IO,
5776         .term_IO = dasd_term_IO,
5777         .handle_terminated_request = dasd_eckd_handle_terminated_request,
5778         .format_device = dasd_eckd_format_device,
5779         .check_device_format = dasd_eckd_check_device_format,
5780         .erp_action = dasd_eckd_erp_action,
5781         .erp_postaction = dasd_eckd_erp_postaction,
5782         .check_for_device_change = dasd_eckd_check_for_device_change,
5783         .build_cp = dasd_eckd_build_alias_cp,
5784         .free_cp = dasd_eckd_free_alias_cp,
5785         .dump_sense = dasd_eckd_dump_sense,
5786         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
5787         .fill_info = dasd_eckd_fill_info,
5788         .ioctl = dasd_eckd_ioctl,
5789         .freeze = dasd_eckd_pm_freeze,
5790         .restore = dasd_eckd_restore_device,
5791         .reload = dasd_eckd_reload_device,
5792         .get_uid = dasd_eckd_get_uid,
5793         .kick_validate = dasd_eckd_kick_validate_server,
5794         .check_attention = dasd_eckd_check_attention,
5795         .host_access_count = dasd_eckd_host_access_count,
5796         .hosts_print = dasd_hosts_print,
5797 };
5798
5799 static int __init
5800 dasd_eckd_init(void)
5801 {
5802         int ret;
5803
5804         ASCEBC(dasd_eckd_discipline.ebcname, 4);
5805         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
5806                                    GFP_KERNEL | GFP_DMA);
5807         if (!dasd_reserve_req)
5808                 return -ENOMEM;
5809         path_verification_worker = kmalloc(sizeof(*path_verification_worker),
5810                                    GFP_KERNEL | GFP_DMA);
5811         if (!path_verification_worker) {
5812                 kfree(dasd_reserve_req);
5813                 return -ENOMEM;
5814         }
5815         rawpadpage = (void *)__get_free_page(GFP_KERNEL);
5816         if (!rawpadpage) {
5817                 kfree(path_verification_worker);
5818                 kfree(dasd_reserve_req);
5819                 return -ENOMEM;
5820         }
5821         ret = ccw_driver_register(&dasd_eckd_driver);
5822         if (!ret)
5823                 wait_for_device_probe();
5824         else {
5825                 kfree(path_verification_worker);
5826                 kfree(dasd_reserve_req);
5827                 free_page((unsigned long)rawpadpage);
5828         }
5829         return ret;
5830 }
5831
5832 static void __exit
5833 dasd_eckd_cleanup(void)
5834 {
5835         ccw_driver_unregister(&dasd_eckd_driver);
5836         kfree(path_verification_worker);
5837         kfree(dasd_reserve_req);
5838         free_page((unsigned long)rawpadpage);
5839 }
5840
5841 module_init(dasd_eckd_init);
5842 module_exit(dasd_eckd_cleanup);