drivers/s390/block/dasd_eckd.c

   1 /*
   2  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   3  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   4  *                  Carsten Otte <Cotte@de.ibm.com>
   5  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   6  * Bugreports.to..: <Linux390@de.ibm.com>
   7  * Copyright IBM Corp. 1999, 2009
   8  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
   9  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
  10  */
  11
  12 #define KMSG_COMPONENT "dasd-eckd"
  13
  14 #include <linux/stddef.h>
  15 #include <linux/kernel.h>
  16 #include <linux/slab.h>
  17 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  18 #include <linux/bio.h>
  19 #include <linux/module.h>
  20 #include <linux/compat.h>
  21 #include <linux/init.h>
  22
  23 #include <asm/css_chars.h>
  24 #include <asm/debug.h>
  25 #include <asm/idals.h>
  26 #include <asm/ebcdic.h>
  27 #include <asm/io.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/cio.h>
  30 #include <asm/ccwdev.h>
  31 #include <asm/itcw.h>
  32 #include <asm/schid.h>
  33 #include <asm/chpid.h>
  34
  35 #include "dasd_int.h"
  36 #include "dasd_eckd.h"
  37
  38 #ifdef PRINTK_HEADER
  39 #undef PRINTK_HEADER
  40 #endif                          /* PRINTK_HEADER */
  41 #define PRINTK_HEADER "dasd(eckd):"
  42
  43 #define ECKD_C0(i) (i->home_bytes)
  44 #define ECKD_F(i) (i->formula)
  45 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
  46                     (i->factors.f_0x02.f1))
  47 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
  48                     (i->factors.f_0x02.f2))
  49 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
  50                     (i->factors.f_0x02.f3))
  51 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
  52 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
  53 #define ECKD_F6(i) (i->factor6)
  54 #define ECKD_F7(i) (i->factor7)
  55 #define ECKD_F8(i) (i->factor8)
  56
  57 /*
  58  * raw track access always map to 64k in memory
  59  * so it maps to 16 blocks of 4k per track
  60  */
  61 #define DASD_RAW_BLOCK_PER_TRACK 16
  62 #define DASD_RAW_BLOCKSIZE 4096
  63 /* 64k are 128 x 512 byte sectors  */
  64 #define DASD_RAW_SECTORS_PER_TRACK 128
  65
  66 MODULE_LICENSE("GPL");
  67
  68 static struct dasd_discipline dasd_eckd_discipline;
  69
  70 /* The ccw bus type uses this table to find devices that it sends to
  71  * dasd_eckd_probe */
  72 static struct ccw_device_id dasd_eckd_ids[] = {
  73         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
  74         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
  75         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
  76         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
  77         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
  78         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
  79         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
  80         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
  81         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
  82         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
  83         { /* end of list */ },
  84 };
  85
  86 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  87
  88 static struct ccw_driver dasd_eckd_driver; /* see below */
  89
  90 static void *rawpadpage;
  91
  92 #define INIT_CQR_OK 0
  93 #define INIT_CQR_UNFORMATTED 1
  94 #define INIT_CQR_ERROR 2
  95
  96 /* emergency request for reserve/release */
  97 static struct {
  98         struct dasd_ccw_req cqr;
  99         struct ccw1 ccw;
 100         char data[32];
 101 } *dasd_reserve_req;
 102 static DEFINE_MUTEX(dasd_reserve_mutex);
 103
 104 /* definitions for the path verification worker */
 105 struct path_verification_work_data {
 106         struct work_struct worker;
 107         struct dasd_device *device;
 108         struct dasd_ccw_req cqr;
 109         struct ccw1 ccw;
 110         __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
 111         int isglobal;
 112         __u8 tbvpm;
 113 };
 114 static struct path_verification_work_data *path_verification_worker;
 115 static DEFINE_MUTEX(dasd_path_verification_mutex);
 116
 117 struct check_attention_work_data {
 118         struct work_struct worker;
 119         struct dasd_device *device;
 120         __u8 lpum;
 121 };
 122
 123 /* initial attempt at a probe function. this can be simplified once
 124  * the other detection code is gone */
 125 static int
 126 dasd_eckd_probe (struct ccw_device *cdev)
 127 {
 128         int ret;
 129
 130         /* set ECKD specific ccw-device options */
 131         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
 132                                      CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
 133         if (ret) {
 134                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
 135                                 "dasd_eckd_probe: could not set "
 136                                 "ccw-device options");
 137                 return ret;
 138         }
 139         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
 140         return ret;
 141 }
 142
 143 static int
 144 dasd_eckd_set_online(struct ccw_device *cdev)
 145 {
 146         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
 147 }
 148
 149 static const int sizes_trk0[] = { 28, 148, 84 };
 150 #define LABEL_SIZE 140
 151
 152 /* head and record addresses of count_area read in analysis ccw */
 153 static const int count_area_head[] = { 0, 0, 0, 0, 2 };
 154 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
 155
 156 static inline unsigned int
 157 round_up_multiple(unsigned int no, unsigned int mult)
 158 {
 159         int rem = no % mult;
 160         return (rem ? no - rem + mult : no);
 161 }
 162
 163 static inline unsigned int
 164 ceil_quot(unsigned int d1, unsigned int d2)
 165 {
 166         return (d1 + (d2 - 1)) / d2;
 167 }
 168
 169 static unsigned int
 170 recs_per_track(struct dasd_eckd_characteristics * rdc,
 171                unsigned int kl, unsigned int dl)
 172 {
 173         int dn, kn;
 174
 175         switch (rdc->dev_type) {
 176         case 0x3380:
 177                 if (kl)
 178                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 179                                        ceil_quot(dl + 12, 32));
 180                 else
 181                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 182         case 0x3390:
 183                 dn = ceil_quot(dl + 6, 232) + 1;
 184                 if (kl) {
 185                         kn = ceil_quot(kl + 6, 232) + 1;
 186                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 187                                        9 + ceil_quot(dl + 6 * dn, 34));
 188                 } else
 189                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 190         case 0x9345:
 191                 dn = ceil_quot(dl + 6, 232) + 1;
 192                 if (kl) {
 193                         kn = ceil_quot(kl + 6, 232) + 1;
 194                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 195                                        ceil_quot(dl + 6 * dn, 34));
 196                 } else
 197                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 198         }
 199         return 0;
 200 }
 201
 202 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
 203 {
 204         geo->cyl = (__u16) cyl;
 205         geo->head = cyl >> 16;
 206         geo->head <<= 4;
 207         geo->head |= head;
 208 }
 209
 210 static int
 211 check_XRC (struct ccw1         *de_ccw,
 212            struct DE_eckd_data *data,
 213            struct dasd_device  *device)
 214 {
 215         struct dasd_eckd_private *private;
 216         int rc;
 217
 218         private = (struct dasd_eckd_private *) device->private;
 219         if (!private->rdc_data.facilities.XRC_supported)
 220                 return 0;
 221
 222         /* switch on System Time Stamp - needed for XRC Support */
 223         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 224         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 225
 226         rc = get_sync_clock(&data->ep_sys_time);
 227         /* Ignore return code if sync clock is switched off. */
 228         if (rc == -EOPNOTSUPP || rc == -EACCES)
 229                 rc = 0;
 230
 231         de_ccw->count = sizeof(struct DE_eckd_data);
 232         de_ccw->flags |= CCW_FLAG_SLI;
 233         return rc;
 234 }
 235
 236 static int
 237 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
 238               unsigned int totrk, int cmd, struct dasd_device *device)
 239 {
 240         struct dasd_eckd_private *private;
 241         u32 begcyl, endcyl;
 242         u16 heads, beghead, endhead;
 243         int rc = 0;
 244
 245         private = (struct dasd_eckd_private *) device->private;
 246
 247         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 248         ccw->flags = 0;
 249         ccw->count = 16;
 250         ccw->cda = (__u32) __pa(data);
 251
 252         memset(data, 0, sizeof(struct DE_eckd_data));
 253         switch (cmd) {
 254         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 255         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 256         case DASD_ECKD_CCW_READ:
 257         case DASD_ECKD_CCW_READ_MT:
 258         case DASD_ECKD_CCW_READ_CKD:
 259         case DASD_ECKD_CCW_READ_CKD_MT:
 260         case DASD_ECKD_CCW_READ_KD:
 261         case DASD_ECKD_CCW_READ_KD_MT:
 262         case DASD_ECKD_CCW_READ_COUNT:
 263                 data->mask.perm = 0x1;
 264                 data->attributes.operation = private->attrib.operation;
 265                 break;
 266         case DASD_ECKD_CCW_WRITE:
 267         case DASD_ECKD_CCW_WRITE_MT:
 268         case DASD_ECKD_CCW_WRITE_KD:
 269         case DASD_ECKD_CCW_WRITE_KD_MT:
 270                 data->mask.perm = 0x02;
 271                 data->attributes.operation = private->attrib.operation;
 272                 rc = check_XRC (ccw, data, device);
 273                 break;
 274         case DASD_ECKD_CCW_WRITE_CKD:
 275         case DASD_ECKD_CCW_WRITE_CKD_MT:
 276                 data->attributes.operation = DASD_BYPASS_CACHE;
 277                 rc = check_XRC (ccw, data, device);
 278                 break;
 279         case DASD_ECKD_CCW_ERASE:
 280         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 281         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 282                 data->mask.perm = 0x3;
 283                 data->mask.auth = 0x1;
 284                 data->attributes.operation = DASD_BYPASS_CACHE;
 285                 rc = check_XRC (ccw, data, device);
 286                 break;
 287         default:
 288                 dev_err(&device->cdev->dev,
 289                         "0x%x is not a known command\n", cmd);
 290                 break;
 291         }
 292
 293         data->attributes.mode = 0x3;    /* ECKD */
 294
 295         if ((private->rdc_data.cu_type == 0x2105 ||
 296              private->rdc_data.cu_type == 0x2107 ||
 297              private->rdc_data.cu_type == 0x1750)
 298             && !(private->uses_cdl && trk < 2))
 299                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 300
 301         heads = private->rdc_data.trk_per_cyl;
 302         begcyl = trk / heads;
 303         beghead = trk % heads;
 304         endcyl = totrk / heads;
 305         endhead = totrk % heads;
 306
 307         /* check for sequential prestage - enhance cylinder range */
 308         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 309             data->attributes.operation == DASD_SEQ_ACCESS) {
 310
 311                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
 312                         endcyl += private->attrib.nr_cyl;
 313                 else
 314                         endcyl = (private->real_cyl - 1);
 315         }
 316
 317         set_ch_t(&data->beg_ext, begcyl, beghead);
 318         set_ch_t(&data->end_ext, endcyl, endhead);
 319         return rc;
 320 }
 321
 322 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
 323                                struct dasd_device  *device)
 324 {
 325         struct dasd_eckd_private *private;
 326         int rc;
 327
 328         private = (struct dasd_eckd_private *) device->private;
 329         if (!private->rdc_data.facilities.XRC_supported)
 330                 return 0;
 331
 332         /* switch on System Time Stamp - needed for XRC Support */
 333         pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid'   */
 334         pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
 335         pfxdata->validity.time_stamp = 1;           /* 'Time Stamp Valid'   */
 336
 337         rc = get_sync_clock(&pfxdata->define_extent.ep_sys_time);
 338         /* Ignore return code if sync clock is switched off. */
 339         if (rc == -EOPNOTSUPP || rc == -EACCES)
 340                 rc = 0;
 341         return rc;
 342 }
 343
 344 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
 345                           unsigned int rec_on_trk, int count, int cmd,
 346                           struct dasd_device *device, unsigned int reclen,
 347                           unsigned int tlf)
 348 {
 349         struct dasd_eckd_private *private;
 350         int sector;
 351         int dn, d;
 352
 353         private = (struct dasd_eckd_private *) device->private;
 354
 355         memset(data, 0, sizeof(*data));
 356         sector = 0;
 357         if (rec_on_trk) {
 358                 switch (private->rdc_data.dev_type) {
 359                 case 0x3390:
 360                         dn = ceil_quot(reclen + 6, 232);
 361                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 362                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 363                         break;
 364                 case 0x3380:
 365                         d = 7 + ceil_quot(reclen + 12, 32);
 366                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 367                         break;
 368                 }
 369         }
 370         data->sector = sector;
 371         /* note: meaning of count depends on the operation
 372          *       for record based I/O it's the number of records, but for
 373          *       track based I/O it's the number of tracks
 374          */
 375         data->count = count;
 376         switch (cmd) {
 377         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 378                 data->operation.orientation = 0x3;
 379                 data->operation.operation = 0x03;
 380                 break;
 381         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 382                 data->operation.orientation = 0x3;
 383                 data->operation.operation = 0x16;
 384                 break;
 385         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 386                 data->operation.orientation = 0x1;
 387                 data->operation.operation = 0x03;
 388                 data->count++;
 389                 break;
 390         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 391                 data->operation.orientation = 0x3;
 392                 data->operation.operation = 0x16;
 393                 data->count++;
 394                 break;
 395         case DASD_ECKD_CCW_WRITE:
 396         case DASD_ECKD_CCW_WRITE_MT:
 397         case DASD_ECKD_CCW_WRITE_KD:
 398         case DASD_ECKD_CCW_WRITE_KD_MT:
 399                 data->auxiliary.length_valid = 0x1;
 400                 data->length = reclen;
 401                 data->operation.operation = 0x01;
 402                 break;
 403         case DASD_ECKD_CCW_WRITE_CKD:
 404         case DASD_ECKD_CCW_WRITE_CKD_MT:
 405                 data->auxiliary.length_valid = 0x1;
 406                 data->length = reclen;
 407                 data->operation.operation = 0x03;
 408                 break;
 409         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 410                 data->operation.orientation = 0x0;
 411                 data->operation.operation = 0x3F;
 412                 data->extended_operation = 0x11;
 413                 data->length = 0;
 414                 data->extended_parameter_length = 0x02;
 415                 if (data->count > 8) {
 416                         data->extended_parameter[0] = 0xFF;
 417                         data->extended_parameter[1] = 0xFF;
 418                         data->extended_parameter[1] <<= (16 - count);
 419                 } else {
 420                         data->extended_parameter[0] = 0xFF;
 421                         data->extended_parameter[0] <<= (8 - count);
 422                         data->extended_parameter[1] = 0x00;
 423                 }
 424                 data->sector = 0xFF;
 425                 break;
 426         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 427                 data->auxiliary.length_valid = 0x1;
 428                 data->length = reclen;  /* not tlf, as one might think */
 429                 data->operation.operation = 0x3F;
 430                 data->extended_operation = 0x23;
 431                 break;
 432         case DASD_ECKD_CCW_READ:
 433         case DASD_ECKD_CCW_READ_MT:
 434         case DASD_ECKD_CCW_READ_KD:
 435         case DASD_ECKD_CCW_READ_KD_MT:
 436                 data->auxiliary.length_valid = 0x1;
 437                 data->length = reclen;
 438                 data->operation.operation = 0x06;
 439                 break;
 440         case DASD_ECKD_CCW_READ_CKD:
 441         case DASD_ECKD_CCW_READ_CKD_MT:
 442                 data->auxiliary.length_valid = 0x1;
 443                 data->length = reclen;
 444                 data->operation.operation = 0x16;
 445                 break;
 446         case DASD_ECKD_CCW_READ_COUNT:
 447                 data->operation.operation = 0x06;
 448                 break;
 449         case DASD_ECKD_CCW_READ_TRACK:
 450                 data->operation.orientation = 0x1;
 451                 data->operation.operation = 0x0C;
 452                 data->extended_parameter_length = 0;
 453                 data->sector = 0xFF;
 454                 break;
 455         case DASD_ECKD_CCW_READ_TRACK_DATA:
 456                 data->auxiliary.length_valid = 0x1;
 457                 data->length = tlf;
 458                 data->operation.operation = 0x0C;
 459                 break;
 460         case DASD_ECKD_CCW_ERASE:
 461                 data->length = reclen;
 462                 data->auxiliary.length_valid = 0x1;
 463                 data->operation.operation = 0x0b;
 464                 break;
 465         default:
 466                 DBF_DEV_EVENT(DBF_ERR, device,
 467                             "fill LRE unknown opcode 0x%x", cmd);
 468                 BUG();
 469         }
 470         set_ch_t(&data->seek_addr,
 471                  trk / private->rdc_data.trk_per_cyl,
 472                  trk % private->rdc_data.trk_per_cyl);
 473         data->search_arg.cyl = data->seek_addr.cyl;
 474         data->search_arg.head = data->seek_addr.head;
 475         data->search_arg.record = rec_on_trk;
 476 }
 477
 478 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 479                       unsigned int trk, unsigned int totrk, int cmd,
 480                       struct dasd_device *basedev, struct dasd_device *startdev,
 481                       unsigned char format, unsigned int rec_on_trk, int count,
 482                       unsigned int blksize, unsigned int tlf)
 483 {
 484         struct dasd_eckd_private *basepriv, *startpriv;
 485         struct DE_eckd_data *dedata;
 486         struct LRE_eckd_data *lredata;
 487         u32 begcyl, endcyl;
 488         u16 heads, beghead, endhead;
 489         int rc = 0;
 490
 491         basepriv = (struct dasd_eckd_private *) basedev->private;
 492         startpriv = (struct dasd_eckd_private *) startdev->private;
 493         dedata = &pfxdata->define_extent;
 494         lredata = &pfxdata->locate_record;
 495
 496         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 497         ccw->flags = 0;
 498         if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
 499                 ccw->count = sizeof(*pfxdata) + 2;
 500                 ccw->cda = (__u32) __pa(pfxdata);
 501                 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
 502         } else {
 503                 ccw->count = sizeof(*pfxdata);
 504                 ccw->cda = (__u32) __pa(pfxdata);
 505                 memset(pfxdata, 0, sizeof(*pfxdata));
 506         }
 507
 508         /* prefix data */
 509         if (format > 1) {
 510                 DBF_DEV_EVENT(DBF_ERR, basedev,
 511                               "PFX LRE unknown format 0x%x", format);
 512                 BUG();
 513                 return -EINVAL;
 514         }
 515         pfxdata->format = format;
 516         pfxdata->base_address = basepriv->ned->unit_addr;
 517         pfxdata->base_lss = basepriv->ned->ID;
 518         pfxdata->validity.define_extent = 1;
 519
 520         /* private uid is kept up to date, conf_data may be outdated */
 521         if (startpriv->uid.type != UA_BASE_DEVICE) {
 522                 pfxdata->validity.verify_base = 1;
 523                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
 524                         pfxdata->validity.hyper_pav = 1;
 525         }
 526
 527         /* define extend data (mostly)*/
 528         switch (cmd) {
 529         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 530         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 531         case DASD_ECKD_CCW_READ:
 532         case DASD_ECKD_CCW_READ_MT:
 533         case DASD_ECKD_CCW_READ_CKD:
 534         case DASD_ECKD_CCW_READ_CKD_MT:
 535         case DASD_ECKD_CCW_READ_KD:
 536         case DASD_ECKD_CCW_READ_KD_MT:
 537         case DASD_ECKD_CCW_READ_COUNT:
 538                 dedata->mask.perm = 0x1;
 539                 dedata->attributes.operation = basepriv->attrib.operation;
 540                 break;
 541         case DASD_ECKD_CCW_READ_TRACK:
 542         case DASD_ECKD_CCW_READ_TRACK_DATA:
 543                 dedata->mask.perm = 0x1;
 544                 dedata->attributes.operation = basepriv->attrib.operation;
 545                 dedata->blk_size = 0;
 546                 break;
 547         case DASD_ECKD_CCW_WRITE:
 548         case DASD_ECKD_CCW_WRITE_MT:
 549         case DASD_ECKD_CCW_WRITE_KD:
 550         case DASD_ECKD_CCW_WRITE_KD_MT:
 551                 dedata->mask.perm = 0x02;
 552                 dedata->attributes.operation = basepriv->attrib.operation;
 553                 rc = check_XRC_on_prefix(pfxdata, basedev);
 554                 break;
 555         case DASD_ECKD_CCW_WRITE_CKD:
 556         case DASD_ECKD_CCW_WRITE_CKD_MT:
 557                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 558                 rc = check_XRC_on_prefix(pfxdata, basedev);
 559                 break;
 560         case DASD_ECKD_CCW_ERASE:
 561         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 562         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 563                 dedata->mask.perm = 0x3;
 564                 dedata->mask.auth = 0x1;
 565                 dedata->attributes.operation = DASD_BYPASS_CACHE;
 566                 rc = check_XRC_on_prefix(pfxdata, basedev);
 567                 break;
 568         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 569                 dedata->mask.perm = 0x03;
 570                 dedata->attributes.operation = basepriv->attrib.operation;
 571                 dedata->blk_size = 0;
 572                 break;
 573         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 574                 dedata->mask.perm = 0x02;
 575                 dedata->attributes.operation = basepriv->attrib.operation;
 576                 dedata->blk_size = blksize;
 577                 rc = check_XRC_on_prefix(pfxdata, basedev);
 578                 break;
 579         default:
 580                 DBF_DEV_EVENT(DBF_ERR, basedev,
 581                             "PFX LRE unknown opcode 0x%x", cmd);
 582                 BUG();
 583                 return -EINVAL;
 584         }
 585
 586         dedata->attributes.mode = 0x3;  /* ECKD */
 587
 588         if ((basepriv->rdc_data.cu_type == 0x2105 ||
 589              basepriv->rdc_data.cu_type == 0x2107 ||
 590              basepriv->rdc_data.cu_type == 0x1750)
 591             && !(basepriv->uses_cdl && trk < 2))
 592                 dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
 593
 594         heads = basepriv->rdc_data.trk_per_cyl;
 595         begcyl = trk / heads;
 596         beghead = trk % heads;
 597         endcyl = totrk / heads;
 598         endhead = totrk % heads;
 599
 600         /* check for sequential prestage - enhance cylinder range */
 601         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
 602             dedata->attributes.operation == DASD_SEQ_ACCESS) {
 603
 604                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
 605                         endcyl += basepriv->attrib.nr_cyl;
 606                 else
 607                         endcyl = (basepriv->real_cyl - 1);
 608         }
 609
 610         set_ch_t(&dedata->beg_ext, begcyl, beghead);
 611         set_ch_t(&dedata->end_ext, endcyl, endhead);
 612
 613         if (format == 1) {
 614                 fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
 615                               basedev, blksize, tlf);
 616         }
 617
 618         return rc;
 619 }
 620
 621 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 622                   unsigned int trk, unsigned int totrk, int cmd,
 623                   struct dasd_device *basedev, struct dasd_device *startdev)
 624 {
 625         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
 626                           0, 0, 0, 0, 0);
 627 }
 628
 629 static void
 630 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
 631               unsigned int rec_on_trk, int no_rec, int cmd,
 632               struct dasd_device * device, int reclen)
 633 {
 634         struct dasd_eckd_private *private;
 635         int sector;
 636         int dn, d;
 637
 638         private = (struct dasd_eckd_private *) device->private;
 639
 640         DBF_DEV_EVENT(DBF_INFO, device,
 641                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 642                   trk, rec_on_trk, no_rec, cmd, reclen);
 643
 644         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 645         ccw->flags = 0;
 646         ccw->count = 16;
 647         ccw->cda = (__u32) __pa(data);
 648
 649         memset(data, 0, sizeof(struct LO_eckd_data));
 650         sector = 0;
 651         if (rec_on_trk) {
 652                 switch (private->rdc_data.dev_type) {
 653                 case 0x3390:
 654                         dn = ceil_quot(reclen + 6, 232);
 655                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 656                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 657                         break;
 658                 case 0x3380:
 659                         d = 7 + ceil_quot(reclen + 12, 32);
 660                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 661                         break;
 662                 }
 663         }
 664         data->sector = sector;
 665         data->count = no_rec;
 666         switch (cmd) {
 667         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 668                 data->operation.orientation = 0x3;
 669                 data->operation.operation = 0x03;
 670                 break;
 671         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 672                 data->operation.orientation = 0x3;
 673                 data->operation.operation = 0x16;
 674                 break;
 675         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 676                 data->operation.orientation = 0x1;
 677                 data->operation.operation = 0x03;
 678                 data->count++;
 679                 break;
 680         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 681                 data->operation.orientation = 0x3;
 682                 data->operation.operation = 0x16;
 683                 data->count++;
 684                 break;
 685         case DASD_ECKD_CCW_WRITE:
 686         case DASD_ECKD_CCW_WRITE_MT:
 687         case DASD_ECKD_CCW_WRITE_KD:
 688         case DASD_ECKD_CCW_WRITE_KD_MT:
 689                 data->auxiliary.last_bytes_used = 0x1;
 690                 data->length = reclen;
 691                 data->operation.operation = 0x01;
 692                 break;
 693         case DASD_ECKD_CCW_WRITE_CKD:
 694         case DASD_ECKD_CCW_WRITE_CKD_MT:
 695                 data->auxiliary.last_bytes_used = 0x1;
 696                 data->length = reclen;
 697                 data->operation.operation = 0x03;
 698                 break;
 699         case DASD_ECKD_CCW_READ:
 700         case DASD_ECKD_CCW_READ_MT:
 701         case DASD_ECKD_CCW_READ_KD:
 702         case DASD_ECKD_CCW_READ_KD_MT:
 703                 data->auxiliary.last_bytes_used = 0x1;
 704                 data->length = reclen;
 705                 data->operation.operation = 0x06;
 706                 break;
 707         case DASD_ECKD_CCW_READ_CKD:
 708         case DASD_ECKD_CCW_READ_CKD_MT:
 709                 data->auxiliary.last_bytes_used = 0x1;
 710                 data->length = reclen;
 711                 data->operation.operation = 0x16;
 712                 break;
 713         case DASD_ECKD_CCW_READ_COUNT:
 714                 data->operation.operation = 0x06;
 715                 break;
 716         case DASD_ECKD_CCW_ERASE:
 717                 data->length = reclen;
 718                 data->auxiliary.last_bytes_used = 0x1;
 719                 data->operation.operation = 0x0b;
 720                 break;
 721         default:
 722                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
 723                               "opcode 0x%x", cmd);
 724         }
 725         set_ch_t(&data->seek_addr,
 726                  trk / private->rdc_data.trk_per_cyl,
 727                  trk % private->rdc_data.trk_per_cyl);
 728         data->search_arg.cyl = data->seek_addr.cyl;
 729         data->search_arg.head = data->seek_addr.head;
 730         data->search_arg.record = rec_on_trk;
 731 }
 732
 733 /*
 734  * Returns 1 if the block is one of the special blocks that needs
 735  * to get read/written with the KD variant of the command.
 736  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 737  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 738  * Luckily the KD variants differ only by one bit (0x08) from the
 739  * normal variant. So don't wonder about code like:
 740  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 741  *         ccw->cmd_code |= 0x8;
 742  */
 743 static inline int
 744 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 745 {
 746         if (recid < 3)
 747                 return 1;
 748         if (recid < blk_per_trk)
 749                 return 0;
 750         if (recid < 2 * blk_per_trk)
 751                 return 1;
 752         return 0;
 753 }
 754
 755 /*
 756  * Returns the record size for the special blocks of the cdl format.
 757  * Only returns something useful if dasd_eckd_cdl_special is true
 758  * for the recid.
 759  */
 760 static inline int
 761 dasd_eckd_cdl_reclen(int recid)
 762 {
 763         if (recid < 3)
 764                 return sizes_trk0[recid];
 765         return LABEL_SIZE;
 766 }
 767 /* create unique id from private structure. */
 768 static void create_uid(struct dasd_eckd_private *private)
 769 {
 770         int count;
 771         struct dasd_uid *uid;
 772
 773         uid = &private->uid;
 774         memset(uid, 0, sizeof(struct dasd_uid));
 775         memcpy(uid->vendor, private->ned->HDA_manufacturer,
 776                sizeof(uid->vendor) - 1);
 777         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 778         memcpy(uid->serial, private->ned->HDA_location,
 779                sizeof(uid->serial) - 1);
 780         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 781         uid->ssid = private->gneq->subsystemID;
 782         uid->real_unit_addr = private->ned->unit_addr;
 783         if (private->sneq) {
 784                 uid->type = private->sneq->sua_flags;
 785                 if (uid->type == UA_BASE_PAV_ALIAS)
 786                         uid->base_unit_addr = private->sneq->base_unit_addr;
 787         } else {
 788                 uid->type = UA_BASE_DEVICE;
 789         }
 790         if (private->vdsneq) {
 791                 for (count = 0; count < 16; count++) {
 792                         sprintf(uid->vduit+2*count, "%02x",
 793                                 private->vdsneq->uit[count]);
 794                 }
 795         }
 796 }
 797
 798 /*
 799  * Generate device unique id that specifies the physical device.
 800  */
 801 static int dasd_eckd_generate_uid(struct dasd_device *device)
 802 {
 803         struct dasd_eckd_private *private;
 804         unsigned long flags;
 805
 806         private = (struct dasd_eckd_private *) device->private;
 807         if (!private)
 808                 return -ENODEV;
 809         if (!private->ned || !private->gneq)
 810                 return -ENODEV;
 811         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 812         create_uid(private);
 813         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 814         return 0;
 815 }
 816
 817 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
 818 {
 819         struct dasd_eckd_private *private;
 820         unsigned long flags;
 821
 822         if (device->private) {
 823                 private = (struct dasd_eckd_private *)device->private;
 824                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 825                 *uid = private->uid;
 826                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 827                 return 0;
 828         }
 829         return -EINVAL;
 830 }
 831
 832 /*
 833  * compare device UID with data of a given dasd_eckd_private structure
 834  * return 0 for match
 835  */
 836 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
 837                                       struct dasd_eckd_private *private)
 838 {
 839         struct dasd_uid device_uid;
 840
 841         create_uid(private);
 842         dasd_eckd_get_uid(device, &device_uid);
 843
 844         return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
 845 }
 846
 847 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
 848                                    struct dasd_ccw_req *cqr,
 849                                    __u8 *rcd_buffer,
 850                                    __u8 lpm)
 851 {
 852         struct ccw1 *ccw;
 853         /*
 854          * buffer has to start with EBCDIC "V1.0" to show
 855          * support for virtual device SNEQ
 856          */
 857         rcd_buffer[0] = 0xE5;
 858         rcd_buffer[1] = 0xF1;
 859         rcd_buffer[2] = 0x4B;
 860         rcd_buffer[3] = 0xF0;
 861
 862         ccw = cqr->cpaddr;
 863         ccw->cmd_code = DASD_ECKD_CCW_RCD;
 864         ccw->flags = 0;
 865         ccw->cda = (__u32)(addr_t)rcd_buffer;
 866         ccw->count = DASD_ECKD_RCD_DATA_SIZE;
 867         cqr->magic = DASD_ECKD_MAGIC;
 868
 869         cqr->startdev = device;
 870         cqr->memdev = device;
 871         cqr->block = NULL;
 872         cqr->expires = 10*HZ;
 873         cqr->lpm = lpm;
 874         cqr->retries = 256;
 875         cqr->buildclk = get_tod_clock();
 876         cqr->status = DASD_CQR_FILLED;
 877         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
 878 }
 879
 880 /*
 881  * Wakeup helper for read_conf
 882  * if the cqr is not done and needs some error recovery
 883  * the buffer has to be re-initialized with the EBCDIC "V1.0"
 884  * to show support for virtual device SNEQ
 885  */
 886 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
 887 {
 888         struct ccw1 *ccw;
 889         __u8 *rcd_buffer;
 890
 891         if (cqr->status !=  DASD_CQR_DONE) {
 892                 ccw = cqr->cpaddr;
 893                 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
 894                 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
 895
 896                 rcd_buffer[0] = 0xE5;
 897                 rcd_buffer[1] = 0xF1;
 898                 rcd_buffer[2] = 0x4B;
 899                 rcd_buffer[3] = 0xF0;
 900         }
 901         dasd_wakeup_cb(cqr, data);
 902 }
 903
 904 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
 905                                            struct dasd_ccw_req *cqr,
 906                                            __u8 *rcd_buffer,
 907                                            __u8 lpm)
 908 {
 909         struct ciw *ciw;
 910         int rc;
 911         /*
 912          * sanity check: scan for RCD command in extended SenseID data
 913          * some devices do not support RCD
 914          */
 915         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 916         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
 917                 return -EOPNOTSUPP;
 918
 919         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
 920         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 921         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
 922         cqr->retries = 5;
 923         cqr->callback = read_conf_cb;
 924         rc = dasd_sleep_on_immediatly(cqr);
 925         return rc;
 926 }
 927
 928 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 929                                    void **rcd_buffer,
 930                                    int *rcd_buffer_size, __u8 lpm)
 931 {
 932         struct ciw *ciw;
 933         char *rcd_buf = NULL;
 934         int ret;
 935         struct dasd_ccw_req *cqr;
 936
 937         /*
 938          * sanity check: scan for RCD command in extended SenseID data
 939          * some devices do not support RCD
 940          */
 941         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 942         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
 943                 ret = -EOPNOTSUPP;
 944                 goto out_error;
 945         }
 946         rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
 947         if (!rcd_buf) {
 948                 ret = -ENOMEM;
 949                 goto out_error;
 950         }
 951         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
 952                                    0, /* use rcd_buf as data ara */
 953                                    device);
 954         if (IS_ERR(cqr)) {
 955                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 956                               "Could not allocate RCD request");
 957                 ret = -ENOMEM;
 958                 goto out_error;
 959         }
 960         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
 961         cqr->callback = read_conf_cb;
 962         ret = dasd_sleep_on(cqr);
 963         /*
 964          * on success we update the user input parms
 965          */
 966         dasd_sfree_request(cqr, cqr->memdev);
 967         if (ret)
 968                 goto out_error;
 969
 970         *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
 971         *rcd_buffer = rcd_buf;
 972         return 0;
 973 out_error:
 974         kfree(rcd_buf);
 975         *rcd_buffer = NULL;
 976         *rcd_buffer_size = 0;
 977         return ret;
 978 }
 979
 980 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
 981 {
 982
 983         struct dasd_sneq *sneq;
 984         int i, count;
 985
 986         private->ned = NULL;
 987         private->sneq = NULL;
 988         private->vdsneq = NULL;
 989         private->gneq = NULL;
 990         count = private->conf_len / sizeof(struct dasd_sneq);
 991         sneq = (struct dasd_sneq *)private->conf_data;
 992         for (i = 0; i < count; ++i) {
 993                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 994                         private->sneq = sneq;
 995                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 996                         private->vdsneq = (struct vd_sneq *)sneq;
 997                 else if (sneq->flags.identifier == 2)
 998                         private->gneq = (struct dasd_gneq *)sneq;
 999                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
1000                         private->ned = (struct dasd_ned *)sneq;
1001                 sneq++;
1002         }
1003         if (!private->ned || !private->gneq) {
1004                 private->ned = NULL;
1005                 private->sneq = NULL;
1006                 private->vdsneq = NULL;
1007                 private->gneq = NULL;
1008                 return -EINVAL;
1009         }
1010         return 0;
1011
1012 };
1013
1014 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
1015 {
1016         struct dasd_gneq *gneq;
1017         int i, count, found;
1018
1019         count = conf_len / sizeof(*gneq);
1020         gneq = (struct dasd_gneq *)conf_data;
1021         found = 0;
1022         for (i = 0; i < count; ++i) {
1023                 if (gneq->flags.identifier == 2) {
1024                         found = 1;
1025                         break;
1026                 }
1027                 gneq++;
1028         }
1029         if (found)
1030                 return ((char *)gneq)[18] & 0x07;
1031         else
1032                 return 0;
1033 }
1034
1035 static int dasd_eckd_read_conf(struct dasd_device *device)
1036 {
1037         void *conf_data;
1038         int conf_len, conf_data_saved;
1039         int rc, path_err, pos;
1040         __u8 lpm, opm;
1041         struct dasd_eckd_private *private, path_private;
1042         struct dasd_path *path_data;
1043         struct dasd_uid *uid;
1044         char print_path_uid[60], print_device_uid[60];
1045
1046         private = (struct dasd_eckd_private *) device->private;
1047         path_data = &device->path_data;
1048         opm = ccw_device_get_path_mask(device->cdev);
1049         conf_data_saved = 0;
1050         path_err = 0;
1051         /* get configuration data per operational path */
1052         for (lpm = 0x80; lpm; lpm>>= 1) {
1053                 if (!(lpm & opm))
1054                         continue;
1055                 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1056                                              &conf_len, lpm);
1057                 if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
1058                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1059                                         "Read configuration data returned "
1060                                         "error %d", rc);
1061                         return rc;
1062                 }
1063                 if (conf_data == NULL) {
1064                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1065                                         "No configuration data "
1066                                         "retrieved");
1067                         /* no further analysis possible */
1068                         path_data->opm |= lpm;
1069                         continue;       /* no error */
1070                 }
1071                 pos = pathmask_to_pos(lpm);
1072                 kfree(private->path_conf_data[pos]);
1073                 if ((__u8 *)private->path_conf_data[pos] ==
1074                     private->conf_data) {
1075                         private->conf_data = NULL;
1076                         private->conf_len = 0;
1077                         conf_data_saved = 0;
1078                 }
1079                 private->path_conf_data[pos] =
1080                         (struct dasd_conf_data *) conf_data;
1081                 /* save first valid configuration data */
1082                 if (!conf_data_saved) {
1083                         kfree(private->conf_data);
1084                         private->conf_data = conf_data;
1085                         private->conf_len = conf_len;
1086                         if (dasd_eckd_identify_conf_parts(private)) {
1087                                 private->conf_data = NULL;
1088                                 private->conf_len = 0;
1089                                 kfree(conf_data);
1090                                 continue;
1091                         }
1092                         /*
1093                          * build device UID that other path data
1094                          * can be compared to it
1095                          */
1096                         dasd_eckd_generate_uid(device);
1097                         conf_data_saved++;
1098                 } else {
1099                         path_private.conf_data = conf_data;
1100                         path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1101                         if (dasd_eckd_identify_conf_parts(
1102                                     &path_private)) {
1103                                 path_private.conf_data = NULL;
1104                                 path_private.conf_len = 0;
1105                                 kfree(conf_data);
1106                                 continue;
1107                         }
1108                         if (dasd_eckd_compare_path_uid(
1109                                     device, &path_private)) {
1110                                 uid = &path_private.uid;
1111                                 if (strlen(uid->vduit) > 0)
1112                                         snprintf(print_path_uid,
1113                                                  sizeof(print_path_uid),
1114                                                  "%s.%s.%04x.%02x.%s",
1115                                                  uid->vendor, uid->serial,
1116                                                  uid->ssid, uid->real_unit_addr,
1117                                                  uid->vduit);
1118                                 else
1119                                         snprintf(print_path_uid,
1120                                                  sizeof(print_path_uid),
1121                                                  "%s.%s.%04x.%02x",
1122                                                  uid->vendor, uid->serial,
1123                                                  uid->ssid,
1124                                                  uid->real_unit_addr);
1125                                 uid = &private->uid;
1126                                 if (strlen(uid->vduit) > 0)
1127                                         snprintf(print_device_uid,
1128                                                  sizeof(print_device_uid),
1129                                                  "%s.%s.%04x.%02x.%s",
1130                                                  uid->vendor, uid->serial,
1131                                                  uid->ssid, uid->real_unit_addr,
1132                                                  uid->vduit);
1133                                 else
1134                                         snprintf(print_device_uid,
1135                                                  sizeof(print_device_uid),
1136                                                  "%s.%s.%04x.%02x",
1137                                                  uid->vendor, uid->serial,
1138                                                  uid->ssid,
1139                                                  uid->real_unit_addr);
1140                                 dev_err(&device->cdev->dev,
1141                                         "Not all channel paths lead to "
1142                                         "the same device, path %02X leads to "
1143                                         "device %s instead of %s\n", lpm,
1144                                         print_path_uid, print_device_uid);
1145                                 path_err = -EINVAL;
1146                                 path_data->cablepm |= lpm;
1147                                 continue;
1148                         }
1149
1150                         path_private.conf_data = NULL;
1151                         path_private.conf_len = 0;
1152                 }
1153                 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1154                 case 0x02:
1155                         path_data->npm |= lpm;
1156                         break;
1157                 case 0x03:
1158                         path_data->ppm |= lpm;
1159                         break;
1160                 }
1161                 path_data->opm |= lpm;
1162                 /*
1163                  * if the path is used
1164                  * it should not be in one of the negative lists
1165                  */
1166                 path_data->cablepm &= ~lpm;
1167                 path_data->hpfpm &= ~lpm;
1168                 path_data->cuirpm &= ~lpm;
1169         }
1170
1171         return path_err;
1172 }
1173
1174 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1175 {
1176         struct dasd_eckd_private *private;
1177         int mdc;
1178         u32 fcx_max_data;
1179
1180         private = (struct dasd_eckd_private *) device->private;
1181         if (private->fcx_max_data) {
1182                 mdc = ccw_device_get_mdc(device->cdev, lpm);
1183                 if ((mdc < 0)) {
1184                         dev_warn(&device->cdev->dev,
1185                                  "Detecting the maximum data size for zHPF "
1186                                  "requests failed (rc=%d) for a new path %x\n",
1187                                  mdc, lpm);
1188                         return mdc;
1189                 }
1190                 fcx_max_data = mdc * FCX_MAX_DATA_FACTOR;
1191                 if (fcx_max_data < private->fcx_max_data) {
1192                         dev_warn(&device->cdev->dev,
1193                                  "The maximum data size for zHPF requests %u "
1194                                  "on a new path %x is below the active maximum "
1195                                  "%u\n", fcx_max_data, lpm,
1196                                  private->fcx_max_data);
1197                         return -EACCES;
1198                 }
1199         }
1200         return 0;
1201 }
1202
1203 static int rebuild_device_uid(struct dasd_device *device,
1204                               struct path_verification_work_data *data)
1205 {
1206         struct dasd_eckd_private *private;
1207         struct dasd_path *path_data;
1208         __u8 lpm, opm;
1209         int rc;
1210
1211         rc = -ENODEV;
1212         private = (struct dasd_eckd_private *) device->private;
1213         path_data = &device->path_data;
1214         opm = device->path_data.opm;
1215
1216         for (lpm = 0x80; lpm; lpm >>= 1) {
1217                 if (!(lpm & opm))
1218                         continue;
1219                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1220                 memset(&data->cqr, 0, sizeof(data->cqr));
1221                 data->cqr.cpaddr = &data->ccw;
1222                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1223                                                      data->rcd_buffer,
1224                                                      lpm);
1225
1226                 if (rc) {
1227                         if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1228                                 continue;
1229                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1230                                         "Read configuration data "
1231                                         "returned error %d", rc);
1232                         break;
1233                 }
1234                 memcpy(private->conf_data, data->rcd_buffer,
1235                        DASD_ECKD_RCD_DATA_SIZE);
1236                 if (dasd_eckd_identify_conf_parts(private)) {
1237                         rc = -ENODEV;
1238                 } else /* first valid path is enough */
1239                         break;
1240         }
1241
1242         if (!rc)
1243                 rc = dasd_eckd_generate_uid(device);
1244
1245         return rc;
1246 }
1247
1248 static void do_path_verification_work(struct work_struct *work)
1249 {
1250         struct path_verification_work_data *data;
1251         struct dasd_device *device;
1252         struct dasd_eckd_private path_private;
1253         struct dasd_uid *uid;
1254         __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1255         __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
1256         unsigned long flags;
1257         char print_uid[60];
1258         int rc;
1259
1260         data = container_of(work, struct path_verification_work_data, worker);
1261         device = data->device;
1262
1263         /* delay path verification until device was resumed */
1264         if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1265                 schedule_work(work);
1266                 return;
1267         }
1268         /* check if path verification already running and delay if so */
1269         if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
1270                 schedule_work(work);
1271                 return;
1272         }
1273         opm = 0;
1274         npm = 0;
1275         ppm = 0;
1276         epm = 0;
1277         hpfpm = 0;
1278         cablepm = 0;
1279
1280         for (lpm = 0x80; lpm; lpm >>= 1) {
1281                 if (!(lpm & data->tbvpm))
1282                         continue;
1283                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1284                 memset(&data->cqr, 0, sizeof(data->cqr));
1285                 data->cqr.cpaddr = &data->ccw;
1286                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1287                                                      data->rcd_buffer,
1288                                                      lpm);
1289                 if (!rc) {
1290                         switch (dasd_eckd_path_access(data->rcd_buffer,
1291                                                       DASD_ECKD_RCD_DATA_SIZE)
1292                                 ) {
1293                         case 0x02:
1294                                 npm |= lpm;
1295                                 break;
1296                         case 0x03:
1297                                 ppm |= lpm;
1298                                 break;
1299                         }
1300                         opm |= lpm;
1301                 } else if (rc == -EOPNOTSUPP) {
1302                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1303                                         "path verification: No configuration "
1304                                         "data retrieved");
1305                         opm |= lpm;
1306                 } else if (rc == -EAGAIN) {
1307                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1308                                         "path verification: device is stopped,"
1309                                         " try again later");
1310                         epm |= lpm;
1311                 } else {
1312                         dev_warn(&device->cdev->dev,
1313                                  "Reading device feature codes failed "
1314                                  "(rc=%d) for new path %x\n", rc, lpm);
1315                         continue;
1316                 }
1317                 if (verify_fcx_max_data(device, lpm)) {
1318                         opm &= ~lpm;
1319                         npm &= ~lpm;
1320                         ppm &= ~lpm;
1321                         hpfpm |= lpm;
1322                         continue;
1323                 }
1324
1325                 /*
1326                  * save conf_data for comparison after
1327                  * rebuild_device_uid may have changed
1328                  * the original data
1329                  */
1330                 memcpy(&path_rcd_buf, data->rcd_buffer,
1331                        DASD_ECKD_RCD_DATA_SIZE);
1332                 path_private.conf_data = (void *) &path_rcd_buf;
1333                 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1334                 if (dasd_eckd_identify_conf_parts(&path_private)) {
1335                         path_private.conf_data = NULL;
1336                         path_private.conf_len = 0;
1337                         continue;
1338                 }
1339
1340                 /*
1341                  * compare path UID with device UID only if at least
1342                  * one valid path is left
1343                  * in other case the device UID may have changed and
1344                  * the first working path UID will be used as device UID
1345                  */
1346                 if (device->path_data.opm &&
1347                     dasd_eckd_compare_path_uid(device, &path_private)) {
1348                         /*
1349                          * the comparison was not successful
1350                          * rebuild the device UID with at least one
1351                          * known path in case a z/VM hyperswap command
1352                          * has changed the device
1353                          *
1354                          * after this compare again
1355                          *
1356                          * if either the rebuild or the recompare fails
1357                          * the path can not be used
1358                          */
1359                         if (rebuild_device_uid(device, data) ||
1360                             dasd_eckd_compare_path_uid(
1361                                     device, &path_private)) {
1362                                 uid = &path_private.uid;
1363                                 if (strlen(uid->vduit) > 0)
1364                                         snprintf(print_uid, sizeof(print_uid),
1365                                                  "%s.%s.%04x.%02x.%s",
1366                                                  uid->vendor, uid->serial,
1367                                                  uid->ssid, uid->real_unit_addr,
1368                                                  uid->vduit);
1369                                 else
1370                                         snprintf(print_uid, sizeof(print_uid),
1371                                                  "%s.%s.%04x.%02x",
1372                                                  uid->vendor, uid->serial,
1373                                                  uid->ssid,
1374                                                  uid->real_unit_addr);
1375                                 dev_err(&device->cdev->dev,
1376                                         "The newly added channel path %02X "
1377                                         "will not be used because it leads "
1378                                         "to a different device %s\n",
1379                                         lpm, print_uid);
1380                                 opm &= ~lpm;
1381                                 npm &= ~lpm;
1382                                 ppm &= ~lpm;
1383                                 cablepm |= lpm;
1384                                 continue;
1385                         }
1386                 }
1387
1388                 /*
1389                  * There is a small chance that a path is lost again between
1390                  * above path verification and the following modification of
1391                  * the device opm mask. We could avoid that race here by using
1392                  * yet another path mask, but we rather deal with this unlikely
1393                  * situation in dasd_start_IO.
1394                  */
1395                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1396                 if (!device->path_data.opm && opm) {
1397                         device->path_data.opm = opm;
1398                         device->path_data.cablepm &= ~opm;
1399                         device->path_data.cuirpm &= ~opm;
1400                         device->path_data.hpfpm &= ~opm;
1401                         dasd_generic_path_operational(device);
1402                 } else {
1403                         device->path_data.opm |= opm;
1404                         device->path_data.cablepm &= ~opm;
1405                         device->path_data.cuirpm &= ~opm;
1406                         device->path_data.hpfpm &= ~opm;
1407                 }
1408                 device->path_data.npm |= npm;
1409                 device->path_data.ppm |= ppm;
1410                 device->path_data.tbvpm |= epm;
1411                 device->path_data.cablepm |= cablepm;
1412                 device->path_data.hpfpm |= hpfpm;
1413                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1414         }
1415         clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
1416         dasd_put_device(device);
1417         if (data->isglobal)
1418                 mutex_unlock(&dasd_path_verification_mutex);
1419         else
1420                 kfree(data);
1421 }
1422
1423 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1424 {
1425         struct path_verification_work_data *data;
1426
1427         data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1428         if (!data) {
1429                 if (mutex_trylock(&dasd_path_verification_mutex)) {
1430                         data = path_verification_worker;
1431                         data->isglobal = 1;
1432                 } else
1433                         return -ENOMEM;
1434         } else {
1435                 memset(data, 0, sizeof(*data));
1436                 data->isglobal = 0;
1437         }
1438         INIT_WORK(&data->worker, do_path_verification_work);
1439         dasd_get_device(device);
1440         data->device = device;
1441         data->tbvpm = lpm;
1442         schedule_work(&data->worker);
1443         return 0;
1444 }
1445
1446 static int dasd_eckd_read_features(struct dasd_device *device)
1447 {
1448         struct dasd_psf_prssd_data *prssdp;
1449         struct dasd_rssd_features *features;
1450         struct dasd_ccw_req *cqr;
1451         struct ccw1 *ccw;
1452         int rc;
1453         struct dasd_eckd_private *private;
1454
1455         private = (struct dasd_eckd_private *) device->private;
1456         memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1457         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1458                                    (sizeof(struct dasd_psf_prssd_data) +
1459                                     sizeof(struct dasd_rssd_features)),
1460                                    device);
1461         if (IS_ERR(cqr)) {
1462                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1463                                 "allocate initialization request");
1464                 return PTR_ERR(cqr);
1465         }
1466         cqr->startdev = device;
1467         cqr->memdev = device;
1468         cqr->block = NULL;
1469         cqr->retries = 256;
1470         cqr->expires = 10 * HZ;
1471
1472         /* Prepare for Read Subsystem Data */
1473         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1474         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1475         prssdp->order = PSF_ORDER_PRSSD;
1476         prssdp->suborder = 0x41;        /* Read Feature Codes */
1477         /* all other bytes of prssdp must be zero */
1478
1479         ccw = cqr->cpaddr;
1480         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1481         ccw->count = sizeof(struct dasd_psf_prssd_data);
1482         ccw->flags |= CCW_FLAG_CC;
1483         ccw->cda = (__u32)(addr_t) prssdp;
1484
1485         /* Read Subsystem Data - feature codes */
1486         features = (struct dasd_rssd_features *) (prssdp + 1);
1487         memset(features, 0, sizeof(struct dasd_rssd_features));
1488
1489         ccw++;
1490         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1491         ccw->count = sizeof(struct dasd_rssd_features);
1492         ccw->cda = (__u32)(addr_t) features;
1493
1494         cqr->buildclk = get_tod_clock();
1495         cqr->status = DASD_CQR_FILLED;
1496         rc = dasd_sleep_on(cqr);
1497         if (rc == 0) {
1498                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1499                 features = (struct dasd_rssd_features *) (prssdp + 1);
1500                 memcpy(&private->features, features,
1501                        sizeof(struct dasd_rssd_features));
1502         } else
1503                 dev_warn(&device->cdev->dev, "Reading device feature codes"
1504                          " failed with rc=%d\n", rc);
1505         dasd_sfree_request(cqr, cqr->memdev);
1506         return rc;
1507 }
1508
1509
1510 /*
1511  * Build CP for Perform Subsystem Function - SSC.
1512  */
1513 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1514                                                     int enable_pav)
1515 {
1516         struct dasd_ccw_req *cqr;
1517         struct dasd_psf_ssc_data *psf_ssc_data;
1518         struct ccw1 *ccw;
1519
1520         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1521                                   sizeof(struct dasd_psf_ssc_data),
1522                                   device);
1523
1524         if (IS_ERR(cqr)) {
1525                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1526                            "Could not allocate PSF-SSC request");
1527                 return cqr;
1528         }
1529         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1530         psf_ssc_data->order = PSF_ORDER_SSC;
1531         psf_ssc_data->suborder = 0xc0;
1532         if (enable_pav) {
1533                 psf_ssc_data->suborder |= 0x08;
1534                 psf_ssc_data->reserved[0] = 0x88;
1535         }
1536         ccw = cqr->cpaddr;
1537         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1538         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1539         ccw->count = 66;
1540
1541         cqr->startdev = device;
1542         cqr->memdev = device;
1543         cqr->block = NULL;
1544         cqr->retries = 256;
1545         cqr->expires = 10*HZ;
1546         cqr->buildclk = get_tod_clock();
1547         cqr->status = DASD_CQR_FILLED;
1548         return cqr;
1549 }
1550
1551 /*
1552  * Perform Subsystem Function.
1553  * It is necessary to trigger CIO for channel revalidation since this
1554  * call might change behaviour of DASD devices.
1555  */
1556 static int
1557 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1558                   unsigned long flags)
1559 {
1560         struct dasd_ccw_req *cqr;
1561         int rc;
1562
1563         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1564         if (IS_ERR(cqr))
1565                 return PTR_ERR(cqr);
1566
1567         /*
1568          * set flags e.g. turn on failfast, to prevent blocking
1569          * the calling function should handle failed requests
1570          */
1571         cqr->flags |= flags;
1572
1573         rc = dasd_sleep_on(cqr);
1574         if (!rc)
1575                 /* trigger CIO to reprobe devices */
1576                 css_schedule_reprobe();
1577         else if (cqr->intrc == -EAGAIN)
1578                 rc = -EAGAIN;
1579
1580         dasd_sfree_request(cqr, cqr->memdev);
1581         return rc;
1582 }
1583
1584 /*
1585  * Valide storage server of current device.
1586  */
1587 static int dasd_eckd_validate_server(struct dasd_device *device,
1588                                      unsigned long flags)
1589 {
1590         int rc;
1591         struct dasd_eckd_private *private;
1592         int enable_pav;
1593
1594         private = (struct dasd_eckd_private *) device->private;
1595         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1596             private->uid.type == UA_HYPER_PAV_ALIAS)
1597                 return 0;
1598         if (dasd_nopav || MACHINE_IS_VM)
1599                 enable_pav = 0;
1600         else
1601                 enable_pav = 1;
1602         rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1603
1604         /* may be requested feature is not available on server,
1605          * therefore just report error and go ahead */
1606         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1607                         "returned rc=%d", private->uid.ssid, rc);
1608         return rc;
1609 }
1610
1611 /*
1612  * worker to do a validate server in case of a lost pathgroup
1613  */
1614 static void dasd_eckd_do_validate_server(struct work_struct *work)
1615 {
1616         struct dasd_device *device = container_of(work, struct dasd_device,
1617                                                   kick_validate);
1618         unsigned long flags = 0;
1619
1620         set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1621         if (dasd_eckd_validate_server(device, flags)
1622             == -EAGAIN) {
1623                 /* schedule worker again if failed */
1624                 schedule_work(&device->kick_validate);
1625                 return;
1626         }
1627
1628         dasd_put_device(device);
1629 }
1630
1631 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1632 {
1633         dasd_get_device(device);
1634         /* exit if device not online or in offline processing */
1635         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1636            device->state < DASD_STATE_ONLINE) {
1637                 dasd_put_device(device);
1638                 return;
1639         }
1640         /* queue call to do_validate_server to the kernel event daemon. */
1641         if (!schedule_work(&device->kick_validate))
1642                 dasd_put_device(device);
1643 }
1644
1645 static u32 get_fcx_max_data(struct dasd_device *device)
1646 {
1647         int tpm, mdc;
1648         int fcx_in_css, fcx_in_gneq, fcx_in_features;
1649         struct dasd_eckd_private *private;
1650
1651         if (dasd_nofcx)
1652                 return 0;
1653         /* is transport mode supported? */
1654         private = (struct dasd_eckd_private *) device->private;
1655         fcx_in_css = css_general_characteristics.fcx;
1656         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1657         fcx_in_features = private->features.feature[40] & 0x80;
1658         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1659
1660         if (!tpm)
1661                 return 0;
1662
1663         mdc = ccw_device_get_mdc(device->cdev, 0);
1664         if (mdc < 0) {
1665                 dev_warn(&device->cdev->dev, "Detecting the maximum supported"
1666                          " data size for zHPF requests failed\n");
1667                 return 0;
1668         } else
1669                 return mdc * FCX_MAX_DATA_FACTOR;
1670 }
1671
1672 /*
1673  * Check device characteristics.
1674  * If the device is accessible using ECKD discipline, the device is enabled.
1675  */
1676 static int
1677 dasd_eckd_check_characteristics(struct dasd_device *device)
1678 {
1679         struct dasd_eckd_private *private;
1680         struct dasd_block *block;
1681         struct dasd_uid temp_uid;
1682         int rc, i;
1683         int readonly;
1684         unsigned long value;
1685
1686         /* setup work queue for validate server*/
1687         INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1688
1689         if (!ccw_device_is_pathgroup(device->cdev)) {
1690                 dev_warn(&device->cdev->dev,
1691                          "A channel path group could not be established\n");
1692                 return -EIO;
1693         }
1694         if (!ccw_device_is_multipath(device->cdev)) {
1695                 dev_info(&device->cdev->dev,
1696                          "The DASD is not operating in multipath mode\n");
1697         }
1698         private = (struct dasd_eckd_private *) device->private;
1699         if (!private) {
1700                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1701                 if (!private) {
1702                         dev_warn(&device->cdev->dev,
1703                                  "Allocating memory for private DASD data "
1704                                  "failed\n");
1705                         return -ENOMEM;
1706                 }
1707                 device->private = (void *) private;
1708         } else {
1709                 memset(private, 0, sizeof(*private));
1710         }
1711         /* Invalidate status of initial analysis. */
1712         private->init_cqr_status = -1;
1713         /* Set default cache operations. */
1714         private->attrib.operation = DASD_NORMAL_CACHE;
1715         private->attrib.nr_cyl = 0;
1716
1717         /* Read Configuration Data */
1718         rc = dasd_eckd_read_conf(device);
1719         if (rc)
1720                 goto out_err1;
1721
1722         /* set default timeout */
1723         device->default_expires = DASD_EXPIRES;
1724         /* set default retry count */
1725         device->default_retries = DASD_RETRIES;
1726
1727         if (private->gneq) {
1728                 value = 1;
1729                 for (i = 0; i < private->gneq->timeout.value; i++)
1730                         value = 10 * value;
1731                 value = value * private->gneq->timeout.number;
1732                 /* do not accept useless values */
1733                 if (value != 0 && value <= DASD_EXPIRES_MAX)
1734                         device->default_expires = value;
1735         }
1736
1737         dasd_eckd_get_uid(device, &temp_uid);
1738         if (temp_uid.type == UA_BASE_DEVICE) {
1739                 block = dasd_alloc_block();
1740                 if (IS_ERR(block)) {
1741                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1742                                         "could not allocate dasd "
1743                                         "block structure");
1744                         rc = PTR_ERR(block);
1745                         goto out_err1;
1746                 }
1747                 device->block = block;
1748                 block->base = device;
1749         }
1750
1751         /* register lcu with alias handling, enable PAV */
1752         rc = dasd_alias_make_device_known_to_lcu(device);
1753         if (rc)
1754                 goto out_err2;
1755
1756         dasd_eckd_validate_server(device, 0);
1757
1758         /* device may report different configuration data after LCU setup */
1759         rc = dasd_eckd_read_conf(device);
1760         if (rc)
1761                 goto out_err3;
1762
1763         /* Read Feature Codes */
1764         dasd_eckd_read_features(device);
1765
1766         /* Read Device Characteristics */
1767         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1768                                          &private->rdc_data, 64);
1769         if (rc) {
1770                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1771                                 "Read device characteristic failed, rc=%d", rc);
1772                 goto out_err3;
1773         }
1774
1775         if ((device->features & DASD_FEATURE_USERAW) &&
1776             !(private->rdc_data.facilities.RT_in_LR)) {
1777                 dev_err(&device->cdev->dev, "The storage server does not "
1778                         "support raw-track access\n");
1779                 rc = -EINVAL;
1780                 goto out_err3;
1781         }
1782
1783         /* find the valid cylinder size */
1784         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1785             private->rdc_data.long_no_cyl)
1786                 private->real_cyl = private->rdc_data.long_no_cyl;
1787         else
1788                 private->real_cyl = private->rdc_data.no_cyl;
1789
1790         private->fcx_max_data = get_fcx_max_data(device);
1791
1792         readonly = dasd_device_is_ro(device);
1793         if (readonly)
1794                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1795
1796         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1797                  "with %d cylinders, %d heads, %d sectors%s\n",
1798                  private->rdc_data.dev_type,
1799                  private->rdc_data.dev_model,
1800                  private->rdc_data.cu_type,
1801                  private->rdc_data.cu_model.model,
1802                  private->real_cyl,
1803                  private->rdc_data.trk_per_cyl,
1804                  private->rdc_data.sec_per_trk,
1805                  readonly ? ", read-only device" : "");
1806         return 0;
1807
1808 out_err3:
1809         dasd_alias_disconnect_device_from_lcu(device);
1810 out_err2:
1811         dasd_free_block(device->block);
1812         device->block = NULL;
1813 out_err1:
1814         kfree(private->conf_data);
1815         kfree(device->private);
1816         device->private = NULL;
1817         return rc;
1818 }
1819
1820 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1821 {
1822         struct dasd_eckd_private *private;
1823         int i;
1824
1825         private = (struct dasd_eckd_private *) device->private;
1826         dasd_alias_disconnect_device_from_lcu(device);
1827         private->ned = NULL;
1828         private->sneq = NULL;
1829         private->vdsneq = NULL;
1830         private->gneq = NULL;
1831         private->conf_len = 0;
1832         for (i = 0; i < 8; i++) {
1833                 kfree(private->path_conf_data[i]);
1834                 if ((__u8 *)private->path_conf_data[i] ==
1835                     private->conf_data) {
1836                         private->conf_data = NULL;
1837                         private->conf_len = 0;
1838                 }
1839                 private->path_conf_data[i] = NULL;
1840         }
1841         kfree(private->conf_data);
1842         private->conf_data = NULL;
1843 }
1844
1845 static struct dasd_ccw_req *
1846 dasd_eckd_analysis_ccw(struct dasd_device *device)
1847 {
1848         struct dasd_eckd_private *private;
1849         struct eckd_count *count_data;
1850         struct LO_eckd_data *LO_data;
1851         struct dasd_ccw_req *cqr;
1852         struct ccw1 *ccw;
1853         int cplength, datasize;
1854         int i;
1855
1856         private = (struct dasd_eckd_private *) device->private;
1857
1858         cplength = 8;
1859         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1860         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1861         if (IS_ERR(cqr))
1862                 return cqr;
1863         ccw = cqr->cpaddr;
1864         /* Define extent for the first 3 tracks. */
1865         define_extent(ccw++, cqr->data, 0, 2,
1866                       DASD_ECKD_CCW_READ_COUNT, device);
1867         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1868         /* Locate record for the first 4 records on track 0. */
1869         ccw[-1].flags |= CCW_FLAG_CC;
1870         locate_record(ccw++, LO_data++, 0, 0, 4,
1871                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1872
1873         count_data = private->count_area;
1874         for (i = 0; i < 4; i++) {
1875                 ccw[-1].flags |= CCW_FLAG_CC;
1876                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1877                 ccw->flags = 0;
1878                 ccw->count = 8;
1879                 ccw->cda = (__u32)(addr_t) count_data;
1880                 ccw++;
1881                 count_data++;
1882         }
1883
1884         /* Locate record for the first record on track 2. */
1885         ccw[-1].flags |= CCW_FLAG_CC;
1886         locate_record(ccw++, LO_data++, 2, 0, 1,
1887                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1888         /* Read count ccw. */
1889         ccw[-1].flags |= CCW_FLAG_CC;
1890         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1891         ccw->flags = 0;
1892         ccw->count = 8;
1893         ccw->cda = (__u32)(addr_t) count_data;
1894
1895         cqr->block = NULL;
1896         cqr->startdev = device;
1897         cqr->memdev = device;
1898         cqr->retries = 255;
1899         cqr->buildclk = get_tod_clock();
1900         cqr->status = DASD_CQR_FILLED;
1901         return cqr;
1902 }
1903
1904 /* differentiate between 'no record found' and any other error */
1905 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1906 {
1907         char *sense;
1908         if (init_cqr->status == DASD_CQR_DONE)
1909                 return INIT_CQR_OK;
1910         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1911                  init_cqr->status == DASD_CQR_FAILED) {
1912                 sense = dasd_get_sense(&init_cqr->irb);
1913                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1914                         return INIT_CQR_UNFORMATTED;
1915                 else
1916                         return INIT_CQR_ERROR;
1917         } else
1918                 return INIT_CQR_ERROR;
1919 }
1920
1921 /*
1922  * This is the callback function for the init_analysis cqr. It saves
1923  * the status of the initial analysis ccw before it frees it and kicks
1924  * the device to continue the startup sequence. This will call
1925  * dasd_eckd_do_analysis again (if the devices has not been marked
1926  * for deletion in the meantime).
1927  */
1928 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1929                                         void *data)
1930 {
1931         struct dasd_eckd_private *private;
1932         struct dasd_device *device;
1933
1934         device = init_cqr->startdev;
1935         private = (struct dasd_eckd_private *) device->private;
1936         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1937         dasd_sfree_request(init_cqr, device);
1938         dasd_kick_device(device);
1939 }
1940
1941 static int dasd_eckd_start_analysis(struct dasd_block *block)
1942 {
1943         struct dasd_ccw_req *init_cqr;
1944
1945         init_cqr = dasd_eckd_analysis_ccw(block->base);
1946         if (IS_ERR(init_cqr))
1947                 return PTR_ERR(init_cqr);
1948         init_cqr->callback = dasd_eckd_analysis_callback;
1949         init_cqr->callback_data = NULL;
1950         init_cqr->expires = 5*HZ;
1951         /* first try without ERP, so we can later handle unformatted
1952          * devices as special case
1953          */
1954         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1955         init_cqr->retries = 0;
1956         dasd_add_request_head(init_cqr);
1957         return -EAGAIN;
1958 }
1959
1960 static int dasd_eckd_end_analysis(struct dasd_block *block)
1961 {
1962         struct dasd_device *device;
1963         struct dasd_eckd_private *private;
1964         struct eckd_count *count_area;
1965         unsigned int sb, blk_per_trk;
1966         int status, i;
1967         struct dasd_ccw_req *init_cqr;
1968
1969         device = block->base;
1970         private = (struct dasd_eckd_private *) device->private;
1971         status = private->init_cqr_status;
1972         private->init_cqr_status = -1;
1973         if (status == INIT_CQR_ERROR) {
1974                 /* try again, this time with full ERP */
1975                 init_cqr = dasd_eckd_analysis_ccw(device);
1976                 dasd_sleep_on(init_cqr);
1977                 status = dasd_eckd_analysis_evaluation(init_cqr);
1978                 dasd_sfree_request(init_cqr, device);
1979         }
1980
1981         if (device->features & DASD_FEATURE_USERAW) {
1982                 block->bp_block = DASD_RAW_BLOCKSIZE;
1983                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1984                 block->s2b_shift = 3;
1985                 goto raw;
1986         }
1987
1988         if (status == INIT_CQR_UNFORMATTED) {
1989                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1990                 return -EMEDIUMTYPE;
1991         } else if (status == INIT_CQR_ERROR) {
1992                 dev_err(&device->cdev->dev,
1993                         "Detecting the DASD disk layout failed because "
1994                         "of an I/O error\n");
1995                 return -EIO;
1996         }
1997
1998         private->uses_cdl = 1;
1999         /* Check Track 0 for Compatible Disk Layout */
2000         count_area = NULL;
2001         for (i = 0; i < 3; i++) {
2002                 if (private->count_area[i].kl != 4 ||
2003                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
2004                     private->count_area[i].cyl != 0 ||
2005                     private->count_area[i].head != count_area_head[i] ||
2006                     private->count_area[i].record != count_area_rec[i]) {
2007                         private->uses_cdl = 0;
2008                         break;
2009                 }
2010         }
2011         if (i == 3)
2012                 count_area = &private->count_area[4];
2013
2014         if (private->uses_cdl == 0) {
2015                 for (i = 0; i < 5; i++) {
2016                         if ((private->count_area[i].kl != 0) ||
2017                             (private->count_area[i].dl !=
2018                              private->count_area[0].dl) ||
2019                             private->count_area[i].cyl !=  0 ||
2020                             private->count_area[i].head != count_area_head[i] ||
2021                             private->count_area[i].record != count_area_rec[i])
2022                                 break;
2023                 }
2024                 if (i == 5)
2025                         count_area = &private->count_area[0];
2026         } else {
2027                 if (private->count_area[3].record == 1)
2028                         dev_warn(&device->cdev->dev,
2029                                  "Track 0 has no records following the VTOC\n");
2030         }
2031
2032         if (count_area != NULL && count_area->kl == 0) {
2033                 /* we found notthing violating our disk layout */
2034                 if (dasd_check_blocksize(count_area->dl) == 0)
2035                         block->bp_block = count_area->dl;
2036         }
2037         if (block->bp_block == 0) {
2038                 dev_warn(&device->cdev->dev,
2039                          "The disk layout of the DASD is not supported\n");
2040                 return -EMEDIUMTYPE;
2041         }
2042         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
2043         for (sb = 512; sb < block->bp_block; sb = sb << 1)
2044                 block->s2b_shift++;
2045
2046         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2047
2048 raw:
2049         block->blocks = (private->real_cyl *
2050                           private->rdc_data.trk_per_cyl *
2051                           blk_per_trk);
2052
2053         dev_info(&device->cdev->dev,
2054                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
2055                  "%s\n", (block->bp_block >> 10),
2056                  ((private->real_cyl *
2057                    private->rdc_data.trk_per_cyl *
2058                    blk_per_trk * (block->bp_block >> 9)) >> 1),
2059                  ((blk_per_trk * block->bp_block) >> 10),
2060                  private->uses_cdl ?
2061                  "compatible disk layout" : "linux disk layout");
2062
2063         return 0;
2064 }
2065
2066 static int dasd_eckd_do_analysis(struct dasd_block *block)
2067 {
2068         struct dasd_eckd_private *private;
2069
2070         private = (struct dasd_eckd_private *) block->base->private;
2071         if (private->init_cqr_status < 0)
2072                 return dasd_eckd_start_analysis(block);
2073         else
2074                 return dasd_eckd_end_analysis(block);
2075 }
2076
2077 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2078 {
2079         return dasd_alias_add_device(device);
2080 };
2081
2082 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2083 {
2084         cancel_work_sync(&device->reload_device);
2085         cancel_work_sync(&device->kick_validate);
2086         return 0;
2087 };
2088
2089 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2090 {
2091         return dasd_alias_remove_device(device);
2092 };
2093
2094 static int
2095 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2096 {
2097         struct dasd_eckd_private *private;
2098
2099         private = (struct dasd_eckd_private *) block->base->private;
2100         if (dasd_check_blocksize(block->bp_block) == 0) {
2101                 geo->sectors = recs_per_track(&private->rdc_data,
2102                                               0, block->bp_block);
2103         }
2104         geo->cylinders = private->rdc_data.no_cyl;
2105         geo->heads = private->rdc_data.trk_per_cyl;
2106         return 0;
2107 }
2108
2109 static struct dasd_ccw_req *
2110 dasd_eckd_build_format(struct dasd_device *base,
2111                        struct format_data_t *fdata,
2112                        int enable_pav)
2113 {
2114         struct dasd_eckd_private *base_priv;
2115         struct dasd_eckd_private *start_priv;
2116         struct dasd_device *startdev = NULL;
2117         struct dasd_ccw_req *fcp;
2118         struct eckd_count *ect;
2119         struct ch_t address;
2120         struct ccw1 *ccw;
2121         void *data;
2122         int rpt;
2123         int cplength, datasize;
2124         int i, j;
2125         int intensity = 0;
2126         int r0_perm;
2127         int nr_tracks;
2128         int use_prefix;
2129
2130         if (enable_pav)
2131                 startdev = dasd_alias_get_start_dev(base);
2132
2133         if (!startdev)
2134                 startdev = base;
2135
2136         start_priv = (struct dasd_eckd_private *) startdev->private;
2137         base_priv = (struct dasd_eckd_private *) base->private;
2138
2139         rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2140
2141         nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2142
2143         /*
2144          * fdata->intensity is a bit string that tells us what to do:
2145          *   Bit 0: write record zero
2146          *   Bit 1: write home address, currently not supported
2147          *   Bit 2: invalidate tracks
2148          *   Bit 3: use OS/390 compatible disk layout (cdl)
2149          *   Bit 4: do not allow storage subsystem to modify record zero
2150          * Only some bit combinations do make sense.
2151          */
2152         if (fdata->intensity & 0x10) {
2153                 r0_perm = 0;
2154                 intensity = fdata->intensity & ~0x10;
2155         } else {
2156                 r0_perm = 1;
2157                 intensity = fdata->intensity;
2158         }
2159
2160         use_prefix = base_priv->features.feature[8] & 0x01;
2161
2162         switch (intensity) {
2163         case 0x00:      /* Normal format */
2164         case 0x08:      /* Normal format, use cdl. */
2165                 cplength = 2 + (rpt*nr_tracks);
2166                 if (use_prefix)
2167                         datasize = sizeof(struct PFX_eckd_data) +
2168                                 sizeof(struct LO_eckd_data) +
2169                                 rpt * nr_tracks * sizeof(struct eckd_count);
2170                 else
2171                         datasize = sizeof(struct DE_eckd_data) +
2172                                 sizeof(struct LO_eckd_data) +
2173                                 rpt * nr_tracks * sizeof(struct eckd_count);
2174                 break;
2175         case 0x01:      /* Write record zero and format track. */
2176         case 0x09:      /* Write record zero and format track, use cdl. */
2177                 cplength = 2 + rpt * nr_tracks;
2178                 if (use_prefix)
2179                         datasize = sizeof(struct PFX_eckd_data) +
2180                                 sizeof(struct LO_eckd_data) +
2181                                 sizeof(struct eckd_count) +
2182                                 rpt * nr_tracks * sizeof(struct eckd_count);
2183                 else
2184                         datasize = sizeof(struct DE_eckd_data) +
2185                                 sizeof(struct LO_eckd_data) +
2186                                 sizeof(struct eckd_count) +
2187                                 rpt * nr_tracks * sizeof(struct eckd_count);
2188                 break;
2189         case 0x04:      /* Invalidate track. */
2190         case 0x0c:      /* Invalidate track, use cdl. */
2191                 cplength = 3;
2192                 if (use_prefix)
2193                         datasize = sizeof(struct PFX_eckd_data) +
2194                                 sizeof(struct LO_eckd_data) +
2195                                 sizeof(struct eckd_count);
2196                 else
2197                         datasize = sizeof(struct DE_eckd_data) +
2198                                 sizeof(struct LO_eckd_data) +
2199                                 sizeof(struct eckd_count);
2200                 break;
2201         default:
2202                 dev_warn(&startdev->cdev->dev,
2203                          "An I/O control call used incorrect flags 0x%x\n",
2204                          fdata->intensity);
2205                 return ERR_PTR(-EINVAL);
2206         }
2207         /* Allocate the format ccw request. */
2208         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
2209                                    datasize, startdev);
2210         if (IS_ERR(fcp))
2211                 return fcp;
2212
2213         start_priv->count++;
2214         data = fcp->data;
2215         ccw = fcp->cpaddr;
2216
2217         switch (intensity & ~0x08) {
2218         case 0x00: /* Normal format. */
2219                 if (use_prefix) {
2220                         prefix(ccw++, (struct PFX_eckd_data *) data,
2221                                fdata->start_unit, fdata->stop_unit,
2222                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2223                         /* grant subsystem permission to format R0 */
2224                         if (r0_perm)
2225                                 ((struct PFX_eckd_data *)data)
2226                                         ->define_extent.ga_extended |= 0x04;
2227                         data += sizeof(struct PFX_eckd_data);
2228                 } else {
2229                         define_extent(ccw++, (struct DE_eckd_data *) data,
2230                                       fdata->start_unit, fdata->stop_unit,
2231                                       DASD_ECKD_CCW_WRITE_CKD, startdev);
2232                         /* grant subsystem permission to format R0 */
2233                         if (r0_perm)
2234                                 ((struct DE_eckd_data *) data)
2235                                         ->ga_extended |= 0x04;
2236                         data += sizeof(struct DE_eckd_data);
2237                 }
2238                 ccw[-1].flags |= CCW_FLAG_CC;
2239                 locate_record(ccw++, (struct LO_eckd_data *) data,
2240                               fdata->start_unit, 0, rpt*nr_tracks,
2241                               DASD_ECKD_CCW_WRITE_CKD, base,
2242                               fdata->blksize);
2243                 data += sizeof(struct LO_eckd_data);
2244                 break;
2245         case 0x01: /* Write record zero + format track. */
2246                 if (use_prefix) {
2247                         prefix(ccw++, (struct PFX_eckd_data *) data,
2248                                fdata->start_unit, fdata->stop_unit,
2249                                DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2250                                base, startdev);
2251                         data += sizeof(struct PFX_eckd_data);
2252                 } else {
2253                         define_extent(ccw++, (struct DE_eckd_data *) data,
2254                                fdata->start_unit, fdata->stop_unit,
2255                                DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev);
2256                         data += sizeof(struct DE_eckd_data);
2257                 }
2258                 ccw[-1].flags |= CCW_FLAG_CC;
2259                 locate_record(ccw++, (struct LO_eckd_data *) data,
2260                               fdata->start_unit, 0, rpt * nr_tracks + 1,
2261                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2262                               base->block->bp_block);
2263                 data += sizeof(struct LO_eckd_data);
2264                 break;
2265         case 0x04: /* Invalidate track. */
2266                 if (use_prefix) {
2267                         prefix(ccw++, (struct PFX_eckd_data *) data,
2268                                fdata->start_unit, fdata->stop_unit,
2269                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2270                         data += sizeof(struct PFX_eckd_data);
2271                 } else {
2272                         define_extent(ccw++, (struct DE_eckd_data *) data,
2273                                fdata->start_unit, fdata->stop_unit,
2274                                DASD_ECKD_CCW_WRITE_CKD, startdev);
2275                         data += sizeof(struct DE_eckd_data);
2276                 }
2277                 ccw[-1].flags |= CCW_FLAG_CC;
2278                 locate_record(ccw++, (struct LO_eckd_data *) data,
2279                               fdata->start_unit, 0, 1,
2280                               DASD_ECKD_CCW_WRITE_CKD, base, 8);
2281                 data += sizeof(struct LO_eckd_data);
2282                 break;
2283         }
2284
2285         for (j = 0; j < nr_tracks; j++) {
2286                 /* calculate cylinder and head for the current track */
2287                 set_ch_t(&address,
2288                          (fdata->start_unit + j) /
2289                          base_priv->rdc_data.trk_per_cyl,
2290                          (fdata->start_unit + j) %
2291                          base_priv->rdc_data.trk_per_cyl);
2292                 if (intensity & 0x01) { /* write record zero */
2293                         ect = (struct eckd_count *) data;
2294                         data += sizeof(struct eckd_count);
2295                         ect->cyl = address.cyl;
2296                         ect->head = address.head;
2297                         ect->record = 0;
2298                         ect->kl = 0;
2299                         ect->dl = 8;
2300                         ccw[-1].flags |= CCW_FLAG_CC;
2301                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2302                         ccw->flags = CCW_FLAG_SLI;
2303                         ccw->count = 8;
2304                         ccw->cda = (__u32)(addr_t) ect;
2305                         ccw++;
2306                 }
2307                 if ((intensity & ~0x08) & 0x04) {       /* erase track */
2308                         ect = (struct eckd_count *) data;
2309                         data += sizeof(struct eckd_count);
2310                         ect->cyl = address.cyl;
2311                         ect->head = address.head;
2312                         ect->record = 1;
2313                         ect->kl = 0;
2314                         ect->dl = 0;
2315                         ccw[-1].flags |= CCW_FLAG_CC;
2316                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2317                         ccw->flags = CCW_FLAG_SLI;
2318                         ccw->count = 8;
2319                         ccw->cda = (__u32)(addr_t) ect;
2320                 } else {                /* write remaining records */
2321                         for (i = 0; i < rpt; i++) {
2322                                 ect = (struct eckd_count *) data;
2323                                 data += sizeof(struct eckd_count);
2324                                 ect->cyl = address.cyl;
2325                                 ect->head = address.head;
2326                                 ect->record = i + 1;
2327                                 ect->kl = 0;
2328                                 ect->dl = fdata->blksize;
2329                                 /*
2330                                  * Check for special tracks 0-1
2331                                  * when formatting CDL
2332                                  */
2333                                 if ((intensity & 0x08) &&
2334                                     fdata->start_unit == 0) {
2335                                         if (i < 3) {
2336                                                 ect->kl = 4;
2337                                                 ect->dl = sizes_trk0[i] - 4;
2338                                         }
2339                                 }
2340                                 if ((intensity & 0x08) &&
2341                                     fdata->start_unit == 1) {
2342                                         ect->kl = 44;
2343                                         ect->dl = LABEL_SIZE - 44;
2344                                 }
2345                                 ccw[-1].flags |= CCW_FLAG_CC;
2346                                 if (i != 0 || j == 0)
2347                                         ccw->cmd_code =
2348                                                 DASD_ECKD_CCW_WRITE_CKD;
2349                                 else
2350                                         ccw->cmd_code =
2351                                                 DASD_ECKD_CCW_WRITE_CKD_MT;
2352                                 ccw->flags = CCW_FLAG_SLI;
2353                                 ccw->count = 8;
2354                                         ccw->cda = (__u32)(addr_t) ect;
2355                                         ccw++;
2356                         }
2357                 }
2358         }
2359
2360         fcp->startdev = startdev;
2361         fcp->memdev = startdev;
2362         fcp->basedev = base;
2363         fcp->retries = 256;
2364         fcp->expires = startdev->default_expires * HZ;
2365         fcp->buildclk = get_tod_clock();
2366         fcp->status = DASD_CQR_FILLED;
2367
2368         return fcp;
2369 }
2370
2371 static int
2372 dasd_eckd_format_device(struct dasd_device *base,
2373                         struct format_data_t *fdata,
2374                         int enable_pav)
2375 {
2376         struct dasd_ccw_req *cqr, *n;
2377         struct dasd_block *block;
2378         struct dasd_eckd_private *private;
2379         struct list_head format_queue;
2380         struct dasd_device *device;
2381         int old_stop, format_step;
2382         int step, rc = 0, sleep_rc;
2383
2384         block = base->block;
2385         private = (struct dasd_eckd_private *) base->private;
2386
2387         /* Sanity checks. */
2388         if (fdata->start_unit >=
2389             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2390                 dev_warn(&base->cdev->dev,
2391                          "Start track number %u used in formatting is too big\n",
2392                          fdata->start_unit);
2393                 return -EINVAL;
2394         }
2395         if (fdata->stop_unit >=
2396             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2397                 dev_warn(&base->cdev->dev,
2398                          "Stop track number %u used in formatting is too big\n",
2399                          fdata->stop_unit);
2400                 return -EINVAL;
2401         }
2402         if (fdata->start_unit > fdata->stop_unit) {
2403                 dev_warn(&base->cdev->dev,
2404                          "Start track %u used in formatting exceeds end track\n",
2405                          fdata->start_unit);
2406                 return -EINVAL;
2407         }
2408         if (dasd_check_blocksize(fdata->blksize) != 0) {
2409                 dev_warn(&base->cdev->dev,
2410                          "The DASD cannot be formatted with block size %u\n",
2411                          fdata->blksize);
2412                 return -EINVAL;
2413         }
2414
2415         INIT_LIST_HEAD(&format_queue);
2416
2417         old_stop = fdata->stop_unit;
2418         while (fdata->start_unit <= 1) {
2419                 fdata->stop_unit = fdata->start_unit;
2420                 cqr = dasd_eckd_build_format(base, fdata, enable_pav);
2421                 list_add(&cqr->blocklist, &format_queue);
2422
2423                 fdata->stop_unit = old_stop;
2424                 fdata->start_unit++;
2425
2426                 if (fdata->start_unit > fdata->stop_unit)
2427                         goto sleep;
2428         }
2429
2430 retry:
2431         format_step = 255 / recs_per_track(&private->rdc_data, 0,
2432                                            fdata->blksize);
2433         while (fdata->start_unit <= old_stop) {
2434                 step = fdata->stop_unit - fdata->start_unit + 1;
2435                 if (step > format_step)
2436                         fdata->stop_unit = fdata->start_unit + format_step - 1;
2437
2438                 cqr = dasd_eckd_build_format(base, fdata, enable_pav);
2439                 if (IS_ERR(cqr)) {
2440                         if (PTR_ERR(cqr) == -ENOMEM) {
2441                                 /*
2442                                  * not enough memory available
2443                                  * go to out and start requests
2444                                  * retry after first requests were finished
2445                                  */
2446                                 fdata->stop_unit = old_stop;
2447                                 goto sleep;
2448                         } else
2449                                 return PTR_ERR(cqr);
2450                 }
2451                 list_add(&cqr->blocklist, &format_queue);
2452
2453                 fdata->start_unit = fdata->stop_unit + 1;
2454                 fdata->stop_unit = old_stop;
2455         }
2456
2457 sleep:
2458         sleep_rc = dasd_sleep_on_queue(&format_queue);
2459
2460         list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
2461                 device = cqr->startdev;
2462                 private = (struct dasd_eckd_private *) device->private;
2463                 if (cqr->status == DASD_CQR_FAILED)
2464                         rc = -EIO;
2465                 list_del_init(&cqr->blocklist);
2466                 dasd_sfree_request(cqr, device);
2467                 private->count--;
2468         }
2469
2470         if (sleep_rc)
2471                 return sleep_rc;
2472
2473         /*
2474          * in case of ENOMEM we need to retry after
2475          * first requests are finished
2476          */
2477         if (fdata->start_unit <= fdata->stop_unit)
2478                 goto retry;
2479
2480         return rc;
2481 }
2482
2483 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2484 {
2485         if (cqr->retries < 0) {
2486                 cqr->status = DASD_CQR_FAILED;
2487                 return;
2488         }
2489         cqr->status = DASD_CQR_FILLED;
2490         if (cqr->block && (cqr->startdev != cqr->block->base)) {
2491                 dasd_eckd_reset_ccw_to_base_io(cqr);
2492                 cqr->startdev = cqr->block->base;
2493                 cqr->lpm = cqr->block->base->path_data.opm;
2494         }
2495 };
2496
2497 static dasd_erp_fn_t
2498 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2499 {
2500         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2501         struct ccw_device *cdev = device->cdev;
2502
2503         switch (cdev->id.cu_type) {
2504         case 0x3990:
2505         case 0x2105:
2506         case 0x2107:
2507         case 0x1750:
2508                 return dasd_3990_erp_action;
2509         case 0x9343:
2510         case 0x3880:
2511         default:
2512                 return dasd_default_erp_action;
2513         }
2514 }
2515
2516 static dasd_erp_fn_t
2517 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2518 {
2519         return dasd_default_erp_postaction;
2520 }
2521
2522 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2523                                               struct dasd_ccw_req *cqr,
2524                                               struct irb *irb)
2525 {
2526         char mask;
2527         char *sense = NULL;
2528         struct dasd_eckd_private *private;
2529
2530         private = (struct dasd_eckd_private *) device->private;
2531         /* first of all check for state change pending interrupt */
2532         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2533         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2534                 /*
2535                  * for alias only, not in offline processing
2536                  * and only if not suspended
2537                  */
2538                 if (!device->block && private->lcu &&
2539                     device->state == DASD_STATE_ONLINE &&
2540                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2541                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2542                         /*
2543                          * the state change could be caused by an alias
2544                          * reassignment remove device from alias handling
2545                          * to prevent new requests from being scheduled on
2546                          * the wrong alias device
2547                          */
2548                         dasd_alias_remove_device(device);
2549
2550                         /* schedule worker to reload device */
2551                         dasd_reload_device(device);
2552                 }
2553                 dasd_generic_handle_state_change(device);
2554                 return;
2555         }
2556
2557         sense = dasd_get_sense(irb);
2558         if (!sense)
2559                 return;
2560
2561         /* summary unit check */
2562         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2563             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2564                 dasd_alias_handle_summary_unit_check(device, irb);
2565                 return;
2566         }
2567
2568         /* service information message SIM */
2569         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
2570             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
2571                 dasd_3990_erp_handle_sim(device, sense);
2572                 return;
2573         }
2574
2575         /* loss of device reservation is handled via base devices only
2576          * as alias devices may be used with several bases
2577          */
2578         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
2579             (sense[7] == 0x3F) &&
2580             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
2581             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
2582                 if (device->features & DASD_FEATURE_FAILONSLCK)
2583                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
2584                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
2585                 dev_err(&device->cdev->dev,
2586                         "The device reservation was lost\n");
2587         }
2588 }
2589
2590 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
2591                                                struct dasd_device *startdev,
2592                                                struct dasd_block *block,
2593                                                struct request *req,
2594                                                sector_t first_rec,
2595                                                sector_t last_rec,
2596                                                sector_t first_trk,
2597                                                sector_t last_trk,
2598                                                unsigned int first_offs,
2599                                                unsigned int last_offs,
2600                                                unsigned int blk_per_trk,
2601                                                unsigned int blksize)
2602 {
2603         struct dasd_eckd_private *private;
2604         unsigned long *idaws;
2605         struct LO_eckd_data *LO_data;
2606         struct dasd_ccw_req *cqr;
2607         struct ccw1 *ccw;
2608         struct req_iterator iter;
2609         struct bio_vec bv;
2610         char *dst;
2611         unsigned int off;
2612         int count, cidaw, cplength, datasize;
2613         sector_t recid;
2614         unsigned char cmd, rcmd;
2615         int use_prefix;
2616         struct dasd_device *basedev;
2617
2618         basedev = block->base;
2619         private = (struct dasd_eckd_private *) basedev->private;
2620         if (rq_data_dir(req) == READ)
2621                 cmd = DASD_ECKD_CCW_READ_MT;
2622         else if (rq_data_dir(req) == WRITE)
2623                 cmd = DASD_ECKD_CCW_WRITE_MT;
2624         else
2625                 return ERR_PTR(-EINVAL);
2626
2627         /* Check struct bio and count the number of blocks for the request. */
2628         count = 0;
2629         cidaw = 0;
2630         rq_for_each_segment(bv, req, iter) {
2631                 if (bv.bv_len & (blksize - 1))
2632                         /* Eckd can only do full blocks. */
2633                         return ERR_PTR(-EINVAL);
2634                 count += bv.bv_len >> (block->s2b_shift + 9);
2635                 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
2636                         cidaw += bv.bv_len >> (block->s2b_shift + 9);
2637         }
2638         /* Paranoia. */
2639         if (count != last_rec - first_rec + 1)
2640                 return ERR_PTR(-EINVAL);
2641
2642         /* use the prefix command if available */
2643         use_prefix = private->features.feature[8] & 0x01;
2644         if (use_prefix) {
2645                 /* 1x prefix + number of blocks */
2646                 cplength = 2 + count;
2647                 /* 1x prefix + cidaws*sizeof(long) */
2648                 datasize = sizeof(struct PFX_eckd_data) +
2649                         sizeof(struct LO_eckd_data) +
2650                         cidaw * sizeof(unsigned long);
2651         } else {
2652                 /* 1x define extent + 1x locate record + number of blocks */
2653                 cplength = 2 + count;
2654                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
2655                 datasize = sizeof(struct DE_eckd_data) +
2656                         sizeof(struct LO_eckd_data) +
2657                         cidaw * sizeof(unsigned long);
2658         }
2659         /* Find out the number of additional locate record ccws for cdl. */
2660         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
2661                 if (last_rec >= 2*blk_per_trk)
2662                         count = 2*blk_per_trk - first_rec;
2663                 cplength += count;
2664                 datasize += count*sizeof(struct LO_eckd_data);
2665         }
2666         /* Allocate the ccw request. */
2667         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2668                                    startdev);
2669         if (IS_ERR(cqr))
2670                 return cqr;
2671         ccw = cqr->cpaddr;
2672         /* First ccw is define extent or prefix. */
2673         if (use_prefix) {
2674                 if (prefix(ccw++, cqr->data, first_trk,
2675                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
2676                         /* Clock not in sync and XRC is enabled.
2677                          * Try again later.
2678                          */
2679                         dasd_sfree_request(cqr, startdev);
2680                         return ERR_PTR(-EAGAIN);
2681                 }
2682                 idaws = (unsigned long *) (cqr->data +
2683                                            sizeof(struct PFX_eckd_data));
2684         } else {
2685                 if (define_extent(ccw++, cqr->data, first_trk,
2686                                   last_trk, cmd, basedev) == -EAGAIN) {
2687                         /* Clock not in sync and XRC is enabled.
2688                          * Try again later.
2689                          */
2690                         dasd_sfree_request(cqr, startdev);
2691                         return ERR_PTR(-EAGAIN);
2692                 }
2693                 idaws = (unsigned long *) (cqr->data +
2694                                            sizeof(struct DE_eckd_data));
2695         }
2696         /* Build locate_record+read/write/ccws. */
2697         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
2698         recid = first_rec;
2699         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
2700                 /* Only standard blocks so there is just one locate record. */
2701                 ccw[-1].flags |= CCW_FLAG_CC;
2702                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
2703                               last_rec - recid + 1, cmd, basedev, blksize);
2704         }
2705         rq_for_each_segment(bv, req, iter) {
2706                 dst = page_address(bv.bv_page) + bv.bv_offset;
2707                 if (dasd_page_cache) {
2708                         char *copy = kmem_cache_alloc(dasd_page_cache,
2709                                                       GFP_DMA | __GFP_NOWARN);
2710                         if (copy && rq_data_dir(req) == WRITE)
2711                                 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
2712                         if (copy)
2713                                 dst = copy + bv.bv_offset;
2714                 }
2715                 for (off = 0; off < bv.bv_len; off += blksize) {
2716                         sector_t trkid = recid;
2717                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
2718                         rcmd = cmd;
2719                         count = blksize;
2720                         /* Locate record for cdl special block ? */
2721                         if (private->uses_cdl && recid < 2*blk_per_trk) {
2722                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
2723                                         rcmd |= 0x8;
2724                                         count = dasd_eckd_cdl_reclen(recid);
2725                                         if (count < blksize &&
2726                                             rq_data_dir(req) == READ)
2727                                                 memset(dst + count, 0xe5,
2728                                                        blksize - count);
2729                                 }
2730                                 ccw[-1].flags |= CCW_FLAG_CC;
2731                                 locate_record(ccw++, LO_data++,
2732                                               trkid, recoffs + 1,
2733                                               1, rcmd, basedev, count);
2734                         }
2735                         /* Locate record for standard blocks ? */
2736                         if (private->uses_cdl && recid == 2*blk_per_trk) {
2737                                 ccw[-1].flags |= CCW_FLAG_CC;
2738                                 locate_record(ccw++, LO_data++,
2739                                               trkid, recoffs + 1,
2740                                               last_rec - recid + 1,
2741                                               cmd, basedev, count);
2742                         }
2743                         /* Read/write ccw. */
2744                         ccw[-1].flags |= CCW_FLAG_CC;
2745                         ccw->cmd_code = rcmd;
2746                         ccw->count = count;
2747                         if (idal_is_needed(dst, blksize)) {
2748                                 ccw->cda = (__u32)(addr_t) idaws;
2749                                 ccw->flags = CCW_FLAG_IDA;
2750                                 idaws = idal_create_words(idaws, dst, blksize);
2751                         } else {
2752                                 ccw->cda = (__u32)(addr_t) dst;
2753                                 ccw->flags = 0;
2754                         }
2755                         ccw++;
2756                         dst += blksize;
2757                         recid++;
2758                 }
2759         }
2760         if (blk_noretry_request(req) ||
2761             block->base->features & DASD_FEATURE_FAILFAST)
2762                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2763         cqr->startdev = startdev;
2764         cqr->memdev = startdev;
2765         cqr->block = block;
2766         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2767         cqr->lpm = startdev->path_data.ppm;
2768         cqr->retries = startdev->default_retries;
2769         cqr->buildclk = get_tod_clock();
2770         cqr->status = DASD_CQR_FILLED;
2771         return cqr;
2772 }
2773
2774 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
2775                                                struct dasd_device *startdev,
2776                                                struct dasd_block *block,
2777                                                struct request *req,
2778                                                sector_t first_rec,
2779                                                sector_t last_rec,
2780                                                sector_t first_trk,
2781                                                sector_t last_trk,
2782                                                unsigned int first_offs,
2783                                                unsigned int last_offs,
2784                                                unsigned int blk_per_trk,
2785                                                unsigned int blksize)
2786 {
2787         unsigned long *idaws;
2788         struct dasd_ccw_req *cqr;
2789         struct ccw1 *ccw;
2790         struct req_iterator iter;
2791         struct bio_vec bv;
2792         char *dst, *idaw_dst;
2793         unsigned int cidaw, cplength, datasize;
2794         unsigned int tlf;
2795         sector_t recid;
2796         unsigned char cmd;
2797         struct dasd_device *basedev;
2798         unsigned int trkcount, count, count_to_trk_end;
2799         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
2800         unsigned char new_track, end_idaw;
2801         sector_t trkid;
2802         unsigned int recoffs;
2803
2804         basedev = block->base;
2805         if (rq_data_dir(req) == READ)
2806                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2807         else if (rq_data_dir(req) == WRITE)
2808                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2809         else
2810                 return ERR_PTR(-EINVAL);
2811
2812         /* Track based I/O needs IDAWs for each page, and not just for
2813          * 64 bit addresses. We need additional idals for pages
2814          * that get filled from two tracks, so we use the number
2815          * of records as upper limit.
2816          */
2817         cidaw = last_rec - first_rec + 1;
2818         trkcount = last_trk - first_trk + 1;
2819
2820         /* 1x prefix + one read/write ccw per track */
2821         cplength = 1 + trkcount;
2822
2823         /* on 31-bit we need space for two 32 bit addresses per page
2824          * on 64-bit one 64 bit address
2825          */
2826         datasize = sizeof(struct PFX_eckd_data) +
2827                 cidaw * sizeof(unsigned long long);
2828
2829         /* Allocate the ccw request. */
2830         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2831                                    startdev);
2832         if (IS_ERR(cqr))
2833                 return cqr;
2834         ccw = cqr->cpaddr;
2835         /* transfer length factor: how many bytes to read from the last track */
2836         if (first_trk == last_trk)
2837                 tlf = last_offs - first_offs + 1;
2838         else
2839                 tlf = last_offs + 1;
2840         tlf *= blksize;
2841
2842         if (prefix_LRE(ccw++, cqr->data, first_trk,
2843                        last_trk, cmd, basedev, startdev,
2844                        1 /* format */, first_offs + 1,
2845                        trkcount, blksize,
2846                        tlf) == -EAGAIN) {
2847                 /* Clock not in sync and XRC is enabled.
2848                  * Try again later.
2849                  */
2850                 dasd_sfree_request(cqr, startdev);
2851                 return ERR_PTR(-EAGAIN);
2852         }
2853
2854         /*
2855          * The translation of request into ccw programs must meet the
2856          * following conditions:
2857          * - all idaws but the first and the last must address full pages
2858          *   (or 2K blocks on 31-bit)
2859          * - the scope of a ccw and it's idal ends with the track boundaries
2860          */
2861         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2862         recid = first_rec;
2863         new_track = 1;
2864         end_idaw = 0;
2865         len_to_track_end = 0;
2866         idaw_dst = NULL;
2867         idaw_len = 0;
2868         rq_for_each_segment(bv, req, iter) {
2869                 dst = page_address(bv.bv_page) + bv.bv_offset;
2870                 seg_len = bv.bv_len;
2871                 while (seg_len) {
2872                         if (new_track) {
2873                                 trkid = recid;
2874                                 recoffs = sector_div(trkid, blk_per_trk);
2875                                 count_to_trk_end = blk_per_trk - recoffs;
2876                                 count = min((last_rec - recid + 1),
2877                                             (sector_t)count_to_trk_end);
2878                                 len_to_track_end = count * blksize;
2879                                 ccw[-1].flags |= CCW_FLAG_CC;
2880                                 ccw->cmd_code = cmd;
2881                                 ccw->count = len_to_track_end;
2882                                 ccw->cda = (__u32)(addr_t)idaws;
2883                                 ccw->flags = CCW_FLAG_IDA;
2884                                 ccw++;
2885                                 recid += count;
2886                                 new_track = 0;
2887                                 /* first idaw for a ccw may start anywhere */
2888                                 if (!idaw_dst)
2889                                         idaw_dst = dst;
2890                         }
2891                         /* If we start a new idaw, we must make sure that it
2892                          * starts on an IDA_BLOCK_SIZE boundary.
2893                          * If we continue an idaw, we must make sure that the
2894                          * current segment begins where the so far accumulated
2895                          * idaw ends
2896                          */
2897                         if (!idaw_dst) {
2898                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2899                                         dasd_sfree_request(cqr, startdev);
2900                                         return ERR_PTR(-ERANGE);
2901                                 } else
2902                                         idaw_dst = dst;
2903                         }
2904                         if ((idaw_dst + idaw_len) != dst) {
2905                                 dasd_sfree_request(cqr, startdev);
2906                                 return ERR_PTR(-ERANGE);
2907                         }
2908                         part_len = min(seg_len, len_to_track_end);
2909                         seg_len -= part_len;
2910                         dst += part_len;
2911                         idaw_len += part_len;
2912                         len_to_track_end -= part_len;
2913                         /* collected memory area ends on an IDA_BLOCK border,
2914                          * -> create an idaw
2915                          * idal_create_words will handle cases where idaw_len
2916                          * is larger then IDA_BLOCK_SIZE
2917                          */
2918                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2919                                 end_idaw = 1;
2920                         /* We also need to end the idaw at track end */
2921                         if (!len_to_track_end) {
2922                                 new_track = 1;
2923                                 end_idaw = 1;
2924                         }
2925                         if (end_idaw) {
2926                                 idaws = idal_create_words(idaws, idaw_dst,
2927                                                           idaw_len);
2928                                 idaw_dst = NULL;
2929                                 idaw_len = 0;
2930                                 end_idaw = 0;
2931                         }
2932                 }
2933         }
2934
2935         if (blk_noretry_request(req) ||
2936             block->base->features & DASD_FEATURE_FAILFAST)
2937                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2938         cqr->startdev = startdev;
2939         cqr->memdev = startdev;
2940         cqr->block = block;
2941         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2942         cqr->lpm = startdev->path_data.ppm;
2943         cqr->retries = startdev->default_retries;
2944         cqr->buildclk = get_tod_clock();
2945         cqr->status = DASD_CQR_FILLED;
2946         return cqr;
2947 }
2948
2949 static int prepare_itcw(struct itcw *itcw,
2950                         unsigned int trk, unsigned int totrk, int cmd,
2951                         struct dasd_device *basedev,
2952                         struct dasd_device *startdev,
2953                         unsigned int rec_on_trk, int count,
2954                         unsigned int blksize,
2955                         unsigned int total_data_size,
2956                         unsigned int tlf,
2957                         unsigned int blk_per_trk)
2958 {
2959         struct PFX_eckd_data pfxdata;
2960         struct dasd_eckd_private *basepriv, *startpriv;
2961         struct DE_eckd_data *dedata;
2962         struct LRE_eckd_data *lredata;
2963         struct dcw *dcw;
2964
2965         u32 begcyl, endcyl;
2966         u16 heads, beghead, endhead;
2967         u8 pfx_cmd;
2968
2969         int rc = 0;
2970         int sector = 0;
2971         int dn, d;
2972
2973
2974         /* setup prefix data */
2975         basepriv = (struct dasd_eckd_private *) basedev->private;
2976         startpriv = (struct dasd_eckd_private *) startdev->private;
2977         dedata = &pfxdata.define_extent;
2978         lredata = &pfxdata.locate_record;
2979
2980         memset(&pfxdata, 0, sizeof(pfxdata));
2981         pfxdata.format = 1; /* PFX with LRE */
2982         pfxdata.base_address = basepriv->ned->unit_addr;
2983         pfxdata.base_lss = basepriv->ned->ID;
2984         pfxdata.validity.define_extent = 1;
2985
2986         /* private uid is kept up to date, conf_data may be outdated */
2987         if (startpriv->uid.type != UA_BASE_DEVICE) {
2988                 pfxdata.validity.verify_base = 1;
2989                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2990                         pfxdata.validity.hyper_pav = 1;
2991         }
2992
2993         switch (cmd) {
2994         case DASD_ECKD_CCW_READ_TRACK_DATA:
2995                 dedata->mask.perm = 0x1;
2996                 dedata->attributes.operation = basepriv->attrib.operation;
2997                 dedata->blk_size = blksize;
2998                 dedata->ga_extended |= 0x42;
2999                 lredata->operation.orientation = 0x0;
3000                 lredata->operation.operation = 0x0C;
3001                 lredata->auxiliary.check_bytes = 0x01;
3002                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
3003                 break;
3004         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
3005                 dedata->mask.perm = 0x02;
3006                 dedata->attributes.operation = basepriv->attrib.operation;
3007                 dedata->blk_size = blksize;
3008                 rc = check_XRC_on_prefix(&pfxdata, basedev);
3009                 dedata->ga_extended |= 0x42;
3010                 lredata->operation.orientation = 0x0;
3011                 lredata->operation.operation = 0x3F;
3012                 lredata->extended_operation = 0x23;
3013                 lredata->auxiliary.check_bytes = 0x2;
3014                 pfx_cmd = DASD_ECKD_CCW_PFX;
3015                 break;
3016         default:
3017                 DBF_DEV_EVENT(DBF_ERR, basedev,
3018                               "prepare itcw, unknown opcode 0x%x", cmd);
3019                 BUG();
3020                 break;
3021         }
3022         if (rc)
3023                 return rc;
3024
3025         dedata->attributes.mode = 0x3;  /* ECKD */
3026
3027         heads = basepriv->rdc_data.trk_per_cyl;
3028         begcyl = trk / heads;
3029         beghead = trk % heads;
3030         endcyl = totrk / heads;
3031         endhead = totrk % heads;
3032
3033         /* check for sequential prestage - enhance cylinder range */
3034         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
3035             dedata->attributes.operation == DASD_SEQ_ACCESS) {
3036
3037                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
3038                         endcyl += basepriv->attrib.nr_cyl;
3039                 else
3040                         endcyl = (basepriv->real_cyl - 1);
3041         }
3042
3043         set_ch_t(&dedata->beg_ext, begcyl, beghead);
3044         set_ch_t(&dedata->end_ext, endcyl, endhead);
3045
3046         dedata->ep_format = 0x20; /* records per track is valid */
3047         dedata->ep_rec_per_track = blk_per_trk;
3048
3049         if (rec_on_trk) {
3050                 switch (basepriv->rdc_data.dev_type) {
3051                 case 0x3390:
3052                         dn = ceil_quot(blksize + 6, 232);
3053                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
3054                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
3055                         break;
3056                 case 0x3380:
3057                         d = 7 + ceil_quot(blksize + 12, 32);
3058                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
3059                         break;
3060                 }
3061         }
3062
3063         lredata->auxiliary.length_valid = 1;
3064         lredata->auxiliary.length_scope = 1;
3065         lredata->auxiliary.imbedded_ccw_valid = 1;
3066         lredata->length = tlf;
3067         lredata->imbedded_ccw = cmd;
3068         lredata->count = count;
3069         lredata->sector = sector;
3070         set_ch_t(&lredata->seek_addr, begcyl, beghead);
3071         lredata->search_arg.cyl = lredata->seek_addr.cyl;
3072         lredata->search_arg.head = lredata->seek_addr.head;
3073         lredata->search_arg.record = rec_on_trk;
3074
3075         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
3076                      &pfxdata, sizeof(pfxdata), total_data_size);
3077         return PTR_RET(dcw);
3078 }
3079
3080 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
3081                                                struct dasd_device *startdev,
3082                                                struct dasd_block *block,
3083                                                struct request *req,
3084                                                sector_t first_rec,
3085                                                sector_t last_rec,
3086                                                sector_t first_trk,
3087                                                sector_t last_trk,
3088                                                unsigned int first_offs,
3089                                                unsigned int last_offs,
3090                                                unsigned int blk_per_trk,
3091                                                unsigned int blksize)
3092 {
3093         struct dasd_ccw_req *cqr;
3094         struct req_iterator iter;
3095         struct bio_vec bv;
3096         char *dst;
3097         unsigned int trkcount, ctidaw;
3098         unsigned char cmd;
3099         struct dasd_device *basedev;
3100         unsigned int tlf;
3101         struct itcw *itcw;
3102         struct tidaw *last_tidaw = NULL;
3103         int itcw_op;
3104         size_t itcw_size;
3105         u8 tidaw_flags;
3106         unsigned int seg_len, part_len, len_to_track_end;
3107         unsigned char new_track;
3108         sector_t recid, trkid;
3109         unsigned int offs;
3110         unsigned int count, count_to_trk_end;
3111         int ret;
3112
3113         basedev = block->base;
3114         if (rq_data_dir(req) == READ) {
3115                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3116                 itcw_op = ITCW_OP_READ;
3117         } else if (rq_data_dir(req) == WRITE) {
3118                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3119                 itcw_op = ITCW_OP_WRITE;
3120         } else
3121                 return ERR_PTR(-EINVAL);
3122
3123         /* trackbased I/O needs address all memory via TIDAWs,
3124          * not just for 64 bit addresses. This allows us to map
3125          * each segment directly to one tidaw.
3126          * In the case of write requests, additional tidaws may
3127          * be needed when a segment crosses a track boundary.
3128          */
3129         trkcount = last_trk - first_trk + 1;
3130         ctidaw = 0;
3131         rq_for_each_segment(bv, req, iter) {
3132                 ++ctidaw;
3133         }
3134         if (rq_data_dir(req) == WRITE)
3135                 ctidaw += (last_trk - first_trk);
3136
3137         /* Allocate the ccw request. */
3138         itcw_size = itcw_calc_size(0, ctidaw, 0);
3139         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
3140         if (IS_ERR(cqr))
3141                 return cqr;
3142
3143         /* transfer length factor: how many bytes to read from the last track */
3144         if (first_trk == last_trk)
3145                 tlf = last_offs - first_offs + 1;
3146         else
3147                 tlf = last_offs + 1;
3148         tlf *= blksize;
3149
3150         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
3151         if (IS_ERR(itcw)) {
3152                 ret = -EINVAL;
3153                 goto out_error;
3154         }
3155         cqr->cpaddr = itcw_get_tcw(itcw);
3156         if (prepare_itcw(itcw, first_trk, last_trk,
3157                          cmd, basedev, startdev,
3158                          first_offs + 1,
3159                          trkcount, blksize,
3160                          (last_rec - first_rec + 1) * blksize,
3161                          tlf, blk_per_trk) == -EAGAIN) {
3162                 /* Clock not in sync and XRC is enabled.
3163                  * Try again later.
3164                  */
3165                 ret = -EAGAIN;
3166                 goto out_error;
3167         }
3168         len_to_track_end = 0;
3169         /*
3170          * A tidaw can address 4k of memory, but must not cross page boundaries
3171          * We can let the block layer handle this by setting
3172          * blk_queue_segment_boundary to page boundaries and
3173          * blk_max_segment_size to page size when setting up the request queue.
3174          * For write requests, a TIDAW must not cross track boundaries, because
3175          * we have to set the CBC flag on the last tidaw for each track.
3176          */
3177         if (rq_data_dir(req) == WRITE) {
3178                 new_track = 1;
3179                 recid = first_rec;
3180                 rq_for_each_segment(bv, req, iter) {
3181                         dst = page_address(bv.bv_page) + bv.bv_offset;
3182                         seg_len = bv.bv_len;
3183                         while (seg_len) {
3184                                 if (new_track) {
3185                                         trkid = recid;
3186                                         offs = sector_div(trkid, blk_per_trk);
3187                                         count_to_trk_end = blk_per_trk - offs;
3188                                         count = min((last_rec - recid + 1),
3189                                                     (sector_t)count_to_trk_end);
3190                                         len_to_track_end = count * blksize;
3191                                         recid += count;
3192                                         new_track = 0;
3193                                 }
3194                                 part_len = min(seg_len, len_to_track_end);
3195                                 seg_len -= part_len;
3196                                 len_to_track_end -= part_len;
3197                                 /* We need to end the tidaw at track end */
3198                                 if (!len_to_track_end) {
3199                                         new_track = 1;
3200                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
3201                                 } else
3202                                         tidaw_flags = 0;
3203                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
3204                                                             dst, part_len);
3205                                 if (IS_ERR(last_tidaw)) {
3206                                         ret = -EINVAL;
3207                                         goto out_error;
3208                                 }
3209                                 dst += part_len;
3210                         }
3211                 }
3212         } else {
3213                 rq_for_each_segment(bv, req, iter) {
3214                         dst = page_address(bv.bv_page) + bv.bv_offset;
3215                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
3216                                                     dst, bv.bv_len);
3217                         if (IS_ERR(last_tidaw)) {
3218                                 ret = -EINVAL;
3219                                 goto out_error;
3220                         }
3221                 }
3222         }
3223         last_tidaw->flags |= TIDAW_FLAGS_LAST;
3224         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
3225         itcw_finalize(itcw);
3226
3227         if (blk_noretry_request(req) ||
3228             block->base->features & DASD_FEATURE_FAILFAST)
3229                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3230         cqr->cpmode = 1;
3231         cqr->startdev = startdev;
3232         cqr->memdev = startdev;
3233         cqr->block = block;
3234         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3235         cqr->lpm = startdev->path_data.ppm;
3236         cqr->retries = startdev->default_retries;
3237         cqr->buildclk = get_tod_clock();
3238         cqr->status = DASD_CQR_FILLED;
3239         return cqr;
3240 out_error:
3241         dasd_sfree_request(cqr, startdev);
3242         return ERR_PTR(ret);
3243 }
3244
3245 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3246                                                struct dasd_block *block,
3247                                                struct request *req)
3248 {
3249         int cmdrtd, cmdwtd;
3250         int use_prefix;
3251         int fcx_multitrack;
3252         struct dasd_eckd_private *private;
3253         struct dasd_device *basedev;
3254         sector_t first_rec, last_rec;
3255         sector_t first_trk, last_trk;
3256         unsigned int first_offs, last_offs;
3257         unsigned int blk_per_trk, blksize;
3258         int cdlspecial;
3259         unsigned int data_size;
3260         struct dasd_ccw_req *cqr;
3261
3262         basedev = block->base;
3263         private = (struct dasd_eckd_private *) basedev->private;
3264
3265         /* Calculate number of blocks/records per track. */
3266         blksize = block->bp_block;
3267         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3268         if (blk_per_trk == 0)
3269                 return ERR_PTR(-EINVAL);
3270         /* Calculate record id of first and last block. */
3271         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3272         first_offs = sector_div(first_trk, blk_per_trk);
3273         last_rec = last_trk =
3274                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3275         last_offs = sector_div(last_trk, blk_per_trk);
3276         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3277
3278         fcx_multitrack = private->features.feature[40] & 0x20;
3279         data_size = blk_rq_bytes(req);
3280         if (data_size % blksize)
3281                 return ERR_PTR(-EINVAL);
3282         /* tpm write request add CBC data on each track boundary */
3283         if (rq_data_dir(req) == WRITE)
3284                 data_size += (last_trk - first_trk) * 4;
3285
3286         /* is read track data and write track data in command mode supported? */
3287         cmdrtd = private->features.feature[9] & 0x20;
3288         cmdwtd = private->features.feature[12] & 0x40;
3289         use_prefix = private->features.feature[8] & 0x01;
3290
3291         cqr = NULL;
3292         if (cdlspecial || dasd_page_cache) {
3293                 /* do nothing, just fall through to the cmd mode single case */
3294         } else if ((data_size <= private->fcx_max_data)
3295                    && (fcx_multitrack || (first_trk == last_trk))) {
3296                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3297                                                     first_rec, last_rec,
3298                                                     first_trk, last_trk,
3299                                                     first_offs, last_offs,
3300                                                     blk_per_trk, blksize);
3301                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3302                     (PTR_ERR(cqr) != -ENOMEM))
3303                         cqr = NULL;
3304         } else if (use_prefix &&
3305                    (((rq_data_dir(req) == READ) && cmdrtd) ||
3306                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3307                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3308                                                    first_rec, last_rec,
3309                                                    first_trk, last_trk,
3310                                                    first_offs, last_offs,
3311                                                    blk_per_trk, blksize);
3312                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3313                     (PTR_ERR(cqr) != -ENOMEM))
3314                         cqr = NULL;
3315         }
3316         if (!cqr)
3317                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3318                                                     first_rec, last_rec,
3319                                                     first_trk, last_trk,
3320                                                     first_offs, last_offs,
3321                                                     blk_per_trk, blksize);
3322         return cqr;
3323 }
3324
3325 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
3326                                                struct dasd_block *block,
3327                                                struct request *req)
3328 {
3329         unsigned long *idaws;
3330         struct dasd_device *basedev;
3331         struct dasd_ccw_req *cqr;
3332         struct ccw1 *ccw;
3333         struct req_iterator iter;
3334         struct bio_vec bv;
3335         char *dst;
3336         unsigned char cmd;
3337         unsigned int trkcount;
3338         unsigned int seg_len, len_to_track_end;
3339         unsigned int first_offs;
3340         unsigned int cidaw, cplength, datasize;
3341         sector_t first_trk, last_trk, sectors;
3342         sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
3343         unsigned int pfx_datasize;
3344
3345         /*
3346          * raw track access needs to be mutiple of 64k and on 64k boundary
3347          * For read requests we can fix an incorrect alignment by padding
3348          * the request with dummy pages.
3349          */
3350         start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
3351         end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
3352                 DASD_RAW_SECTORS_PER_TRACK;
3353         end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
3354                 DASD_RAW_SECTORS_PER_TRACK;
3355         basedev = block->base;
3356         if ((start_padding_sectors || end_padding_sectors) &&
3357             (rq_data_dir(req) == WRITE)) {
3358                 DBF_DEV_EVENT(DBF_ERR, basedev,
3359                               "raw write not track aligned (%lu,%lu) req %p",
3360                               start_padding_sectors, end_padding_sectors, req);
3361                 cqr = ERR_PTR(-EINVAL);
3362                 goto out;
3363         }
3364
3365         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3366         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3367                 DASD_RAW_SECTORS_PER_TRACK;
3368         trkcount = last_trk - first_trk + 1;
3369         first_offs = 0;
3370
3371         if (rq_data_dir(req) == READ)
3372                 cmd = DASD_ECKD_CCW_READ_TRACK;
3373         else if (rq_data_dir(req) == WRITE)
3374                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3375         else {
3376                 cqr = ERR_PTR(-EINVAL);
3377                 goto out;
3378         }
3379
3380         /*
3381          * Raw track based I/O needs IDAWs for each page,
3382          * and not just for 64 bit addresses.
3383          */
3384         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3385
3386         /* 1x prefix + one read/write ccw per track */
3387         cplength = 1 + trkcount;
3388
3389         /*
3390          * struct PFX_eckd_data has up to 2 byte as extended parameter
3391          * this is needed for write full track and has to be mentioned
3392          * separately
3393          * add 8 instead of 2 to keep 8 byte boundary
3394          */
3395         pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
3396
3397         datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
3398
3399         /* Allocate the ccw request. */
3400         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3401                                    datasize, startdev);
3402         if (IS_ERR(cqr))
3403                 goto out;
3404         ccw = cqr->cpaddr;
3405
3406         if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
3407                        basedev, startdev, 1 /* format */, first_offs + 1,
3408                        trkcount, 0, 0) == -EAGAIN) {
3409                 /* Clock not in sync and XRC is enabled.
3410                  * Try again later.
3411                  */
3412                 dasd_sfree_request(cqr, startdev);
3413                 cqr = ERR_PTR(-EAGAIN);
3414                 goto out;
3415         }
3416
3417         idaws = (unsigned long *)(cqr->data + pfx_datasize);
3418         len_to_track_end = 0;
3419         if (start_padding_sectors) {
3420                 ccw[-1].flags |= CCW_FLAG_CC;
3421                 ccw->cmd_code = cmd;
3422                 /* maximum 3390 track size */
3423                 ccw->count = 57326;
3424                 /* 64k map to one track */
3425                 len_to_track_end = 65536 - start_padding_sectors * 512;
3426                 ccw->cda = (__u32)(addr_t)idaws;
3427                 ccw->flags |= CCW_FLAG_IDA;
3428                 ccw->flags |= CCW_FLAG_SLI;
3429                 ccw++;
3430                 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
3431                         idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3432         }
3433         rq_for_each_segment(bv, req, iter) {
3434                 dst = page_address(bv.bv_page) + bv.bv_offset;
3435                 seg_len = bv.bv_len;
3436                 if (cmd == DASD_ECKD_CCW_READ_TRACK)
3437                         memset(dst, 0, seg_len);
3438                 if (!len_to_track_end) {
3439                         ccw[-1].flags |= CCW_FLAG_CC;
3440                         ccw->cmd_code = cmd;
3441                         /* maximum 3390 track size */
3442                         ccw->count = 57326;
3443                         /* 64k map to one track */
3444                         len_to_track_end = 65536;
3445                         ccw->cda = (__u32)(addr_t)idaws;
3446                         ccw->flags |= CCW_FLAG_IDA;
3447                         ccw->flags |= CCW_FLAG_SLI;
3448                         ccw++;
3449                 }
3450                 len_to_track_end -= seg_len;
3451                 idaws = idal_create_words(idaws, dst, seg_len);
3452         }
3453         for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
3454                 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3455         if (blk_noretry_request(req) ||
3456             block->base->features & DASD_FEATURE_FAILFAST)
3457                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3458         cqr->startdev = startdev;
3459         cqr->memdev = startdev;
3460         cqr->block = block;
3461         cqr->expires = startdev->default_expires * HZ;
3462         cqr->lpm = startdev->path_data.ppm;
3463         cqr->retries = startdev->default_retries;
3464         cqr->buildclk = get_tod_clock();
3465         cqr->status = DASD_CQR_FILLED;
3466
3467         if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
3468                 cqr = NULL;
3469 out:
3470         return cqr;
3471 }
3472
3473
3474 static int
3475 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3476 {
3477         struct dasd_eckd_private *private;
3478         struct ccw1 *ccw;
3479         struct req_iterator iter;
3480         struct bio_vec bv;
3481         char *dst, *cda;
3482         unsigned int blksize, blk_per_trk, off;
3483         sector_t recid;
3484         int status;
3485
3486         if (!dasd_page_cache)
3487                 goto out;
3488         private = (struct dasd_eckd_private *) cqr->block->base->private;
3489         blksize = cqr->block->bp_block;
3490         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3491         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3492         ccw = cqr->cpaddr;
3493         /* Skip over define extent & locate record. */
3494         ccw++;
3495         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3496                 ccw++;
3497         rq_for_each_segment(bv, req, iter) {
3498                 dst = page_address(bv.bv_page) + bv.bv_offset;
3499                 for (off = 0; off < bv.bv_len; off += blksize) {
3500                         /* Skip locate record. */
3501                         if (private->uses_cdl && recid <= 2*blk_per_trk)
3502                                 ccw++;
3503                         if (dst) {
3504                                 if (ccw->flags & CCW_FLAG_IDA)
3505                                         cda = *((char **)((addr_t) ccw->cda));
3506                                 else
3507                                         cda = (char *)((addr_t) ccw->cda);
3508                                 if (dst != cda) {
3509                                         if (rq_data_dir(req) == READ)
3510                                                 memcpy(dst, cda, bv.bv_len);
3511                                         kmem_cache_free(dasd_page_cache,
3512                                             (void *)((addr_t)cda & PAGE_MASK));
3513                                 }
3514                                 dst = NULL;
3515                         }
3516                         ccw++;
3517                         recid++;
3518                 }
3519         }
3520 out:
3521         status = cqr->status == DASD_CQR_DONE;
3522         dasd_sfree_request(cqr, cqr->memdev);
3523         return status;
3524 }
3525
3526 /*
3527  * Modify ccw/tcw in cqr so it can be started on a base device.
3528  *
3529  * Note that this is not enough to restart the cqr!
3530  * Either reset cqr->startdev as well (summary unit check handling)
3531  * or restart via separate cqr (as in ERP handling).
3532  */
3533 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3534 {
3535         struct ccw1 *ccw;
3536         struct PFX_eckd_data *pfxdata;
3537         struct tcw *tcw;
3538         struct tccb *tccb;
3539         struct dcw *dcw;
3540
3541         if (cqr->cpmode == 1) {
3542                 tcw = cqr->cpaddr;
3543                 tccb = tcw_get_tccb(tcw);
3544                 dcw = (struct dcw *)&tccb->tca[0];
3545                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
3546                 pfxdata->validity.verify_base = 0;
3547                 pfxdata->validity.hyper_pav = 0;
3548         } else {
3549                 ccw = cqr->cpaddr;
3550                 pfxdata = cqr->data;
3551                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
3552                         pfxdata->validity.verify_base = 0;
3553                         pfxdata->validity.hyper_pav = 0;
3554                 }
3555         }
3556 }
3557
3558 #define DASD_ECKD_CHANQ_MAX_SIZE 4
3559
3560 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
3561                                                      struct dasd_block *block,
3562                                                      struct request *req)
3563 {
3564         struct dasd_eckd_private *private;
3565         struct dasd_device *startdev;
3566         unsigned long flags;
3567         struct dasd_ccw_req *cqr;
3568
3569         startdev = dasd_alias_get_start_dev(base);
3570         if (!startdev)
3571                 startdev = base;
3572         private = (struct dasd_eckd_private *) startdev->private;
3573         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
3574                 return ERR_PTR(-EBUSY);
3575
3576         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
3577         private->count++;
3578         if ((base->features & DASD_FEATURE_USERAW))
3579                 cqr = dasd_raw_build_cp(startdev, block, req);
3580         else
3581                 cqr = dasd_eckd_build_cp(startdev, block, req);
3582         if (IS_ERR(cqr))
3583                 private->count--;
3584         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
3585         return cqr;
3586 }
3587
3588 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
3589                                    struct request *req)
3590 {
3591         struct dasd_eckd_private *private;
3592         unsigned long flags;
3593
3594         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
3595         private = (struct dasd_eckd_private *) cqr->memdev->private;
3596         private->count--;
3597         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
3598         return dasd_eckd_free_cp(cqr, req);
3599 }
3600
3601 static int
3602 dasd_eckd_fill_info(struct dasd_device * device,
3603                     struct dasd_information2_t * info)
3604 {
3605         struct dasd_eckd_private *private;
3606
3607         private = (struct dasd_eckd_private *) device->private;
3608         info->label_block = 2;
3609         info->FBA_layout = private->uses_cdl ? 0 : 1;
3610         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
3611         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
3612         memcpy(info->characteristics, &private->rdc_data,
3613                sizeof(struct dasd_eckd_characteristics));
3614         info->confdata_size = min((unsigned long)private->conf_len,
3615                                   sizeof(info->configuration_data));
3616         memcpy(info->configuration_data, private->conf_data,
3617                info->confdata_size);
3618         return 0;
3619 }
3620
3621 /*
3622  * SECTION: ioctl functions for eckd devices.
3623  */
3624
3625 /*
3626  * Release device ioctl.
3627  * Buils a channel programm to releases a prior reserved
3628  * (see dasd_eckd_reserve) device.
3629  */
3630 static int
3631 dasd_eckd_release(struct dasd_device *device)
3632 {
3633         struct dasd_ccw_req *cqr;
3634         int rc;
3635         struct ccw1 *ccw;
3636         int useglobal;
3637
3638         if (!capable(CAP_SYS_ADMIN))
3639                 return -EACCES;
3640
3641         useglobal = 0;
3642         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3643         if (IS_ERR(cqr)) {
3644                 mutex_lock(&dasd_reserve_mutex);
3645                 useglobal = 1;
3646                 cqr = &dasd_reserve_req->cqr;
3647                 memset(cqr, 0, sizeof(*cqr));
3648                 memset(&dasd_reserve_req->ccw, 0,
3649                        sizeof(dasd_reserve_req->ccw));
3650                 cqr->cpaddr = &dasd_reserve_req->ccw;
3651                 cqr->data = &dasd_reserve_req->data;
3652                 cqr->magic = DASD_ECKD_MAGIC;
3653         }
3654         ccw = cqr->cpaddr;
3655         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
3656         ccw->flags |= CCW_FLAG_SLI;
3657         ccw->count = 32;
3658         ccw->cda = (__u32)(addr_t) cqr->data;
3659         cqr->startdev = device;
3660         cqr->memdev = device;
3661         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3662         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3663         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3664         cqr->expires = 2 * HZ;
3665         cqr->buildclk = get_tod_clock();
3666         cqr->status = DASD_CQR_FILLED;
3667
3668         rc = dasd_sleep_on_immediatly(cqr);
3669         if (!rc)
3670                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3671
3672         if (useglobal)
3673                 mutex_unlock(&dasd_reserve_mutex);
3674         else
3675                 dasd_sfree_request(cqr, cqr->memdev);
3676         return rc;
3677 }
3678
3679 /*
3680  * Reserve device ioctl.
3681  * Options are set to 'synchronous wait for interrupt' and
3682  * 'timeout the request'. This leads to a terminate IO if
3683  * the interrupt is outstanding for a certain time.
3684  */
3685 static int
3686 dasd_eckd_reserve(struct dasd_device *device)
3687 {
3688         struct dasd_ccw_req *cqr;
3689         int rc;
3690         struct ccw1 *ccw;
3691         int useglobal;
3692
3693         if (!capable(CAP_SYS_ADMIN))
3694                 return -EACCES;
3695
3696         useglobal = 0;
3697         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3698         if (IS_ERR(cqr)) {
3699                 mutex_lock(&dasd_reserve_mutex);
3700                 useglobal = 1;
3701                 cqr = &dasd_reserve_req->cqr;
3702                 memset(cqr, 0, sizeof(*cqr));
3703                 memset(&dasd_reserve_req->ccw, 0,
3704                        sizeof(dasd_reserve_req->ccw));
3705                 cqr->cpaddr = &dasd_reserve_req->ccw;
3706                 cqr->data = &dasd_reserve_req->data;
3707                 cqr->magic = DASD_ECKD_MAGIC;
3708         }
3709         ccw = cqr->cpaddr;
3710         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
3711         ccw->flags |= CCW_FLAG_SLI;
3712         ccw->count = 32;
3713         ccw->cda = (__u32)(addr_t) cqr->data;
3714         cqr->startdev = device;
3715         cqr->memdev = device;
3716         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3717         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3718         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3719         cqr->expires = 2 * HZ;
3720         cqr->buildclk = get_tod_clock();
3721         cqr->status = DASD_CQR_FILLED;
3722
3723         rc = dasd_sleep_on_immediatly(cqr);
3724         if (!rc)
3725                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3726
3727         if (useglobal)
3728                 mutex_unlock(&dasd_reserve_mutex);
3729         else
3730                 dasd_sfree_request(cqr, cqr->memdev);
3731         return rc;
3732 }
3733
3734 /*
3735  * Steal lock ioctl - unconditional reserve device.
3736  * Buils a channel programm to break a device's reservation.
3737  * (unconditional reserve)
3738  */
3739 static int
3740 dasd_eckd_steal_lock(struct dasd_device *device)
3741 {
3742         struct dasd_ccw_req *cqr;
3743         int rc;
3744         struct ccw1 *ccw;
3745         int useglobal;
3746
3747         if (!capable(CAP_SYS_ADMIN))
3748                 return -EACCES;
3749
3750         useglobal = 0;
3751         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3752         if (IS_ERR(cqr)) {
3753                 mutex_lock(&dasd_reserve_mutex);
3754                 useglobal = 1;
3755                 cqr = &dasd_reserve_req->cqr;
3756                 memset(cqr, 0, sizeof(*cqr));
3757                 memset(&dasd_reserve_req->ccw, 0,
3758                        sizeof(dasd_reserve_req->ccw));
3759                 cqr->cpaddr = &dasd_reserve_req->ccw;
3760                 cqr->data = &dasd_reserve_req->data;
3761                 cqr->magic = DASD_ECKD_MAGIC;
3762         }
3763         ccw = cqr->cpaddr;
3764         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
3765         ccw->flags |= CCW_FLAG_SLI;
3766         ccw->count = 32;
3767         ccw->cda = (__u32)(addr_t) cqr->data;
3768         cqr->startdev = device;
3769         cqr->memdev = device;
3770         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3771         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3772         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3773         cqr->expires = 2 * HZ;
3774         cqr->buildclk = get_tod_clock();
3775         cqr->status = DASD_CQR_FILLED;
3776
3777         rc = dasd_sleep_on_immediatly(cqr);
3778         if (!rc)
3779                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3780
3781         if (useglobal)
3782                 mutex_unlock(&dasd_reserve_mutex);
3783         else
3784                 dasd_sfree_request(cqr, cqr->memdev);
3785         return rc;
3786 }
3787
3788 /*
3789  * SNID - Sense Path Group ID
3790  * This ioctl may be used in situations where I/O is stalled due to
3791  * a reserve, so if the normal dasd_smalloc_request fails, we use the
3792  * preallocated dasd_reserve_req.
3793  */
3794 static int dasd_eckd_snid(struct dasd_device *device,
3795                           void __user *argp)
3796 {
3797         struct dasd_ccw_req *cqr;
3798         int rc;
3799         struct ccw1 *ccw;
3800         int useglobal;
3801         struct dasd_snid_ioctl_data usrparm;
3802
3803         if (!capable(CAP_SYS_ADMIN))
3804                 return -EACCES;
3805
3806         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3807                 return -EFAULT;
3808
3809         useglobal = 0;
3810         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
3811                                    sizeof(struct dasd_snid_data), device);
3812         if (IS_ERR(cqr)) {
3813                 mutex_lock(&dasd_reserve_mutex);
3814                 useglobal = 1;
3815                 cqr = &dasd_reserve_req->cqr;
3816                 memset(cqr, 0, sizeof(*cqr));
3817                 memset(&dasd_reserve_req->ccw, 0,
3818                        sizeof(dasd_reserve_req->ccw));
3819                 cqr->cpaddr = &dasd_reserve_req->ccw;
3820                 cqr->data = &dasd_reserve_req->data;
3821                 cqr->magic = DASD_ECKD_MAGIC;
3822         }
3823         ccw = cqr->cpaddr;
3824         ccw->cmd_code = DASD_ECKD_CCW_SNID;
3825         ccw->flags |= CCW_FLAG_SLI;
3826         ccw->count = 12;
3827         ccw->cda = (__u32)(addr_t) cqr->data;
3828         cqr->startdev = device;
3829         cqr->memdev = device;
3830         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3831         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3832         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
3833         cqr->retries = 5;
3834         cqr->expires = 10 * HZ;
3835         cqr->buildclk = get_tod_clock();
3836         cqr->status = DASD_CQR_FILLED;
3837         cqr->lpm = usrparm.path_mask;
3838
3839         rc = dasd_sleep_on_immediatly(cqr);
3840         /* verify that I/O processing didn't modify the path mask */
3841         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
3842                 rc = -EIO;
3843         if (!rc) {
3844                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
3845                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
3846                         rc = -EFAULT;
3847         }
3848
3849         if (useglobal)
3850                 mutex_unlock(&dasd_reserve_mutex);
3851         else
3852                 dasd_sfree_request(cqr, cqr->memdev);
3853         return rc;
3854 }
3855
3856 /*
3857  * Read performance statistics
3858  */
3859 static int
3860 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
3861 {
3862         struct dasd_psf_prssd_data *prssdp;
3863         struct dasd_rssd_perf_stats_t *stats;
3864         struct dasd_ccw_req *cqr;
3865         struct ccw1 *ccw;
3866         int rc;
3867
3868         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
3869                                    (sizeof(struct dasd_psf_prssd_data) +
3870                                     sizeof(struct dasd_rssd_perf_stats_t)),
3871                                    device);
3872         if (IS_ERR(cqr)) {
3873                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3874                             "Could not allocate initialization request");
3875                 return PTR_ERR(cqr);
3876         }
3877         cqr->startdev = device;
3878         cqr->memdev = device;
3879         cqr->retries = 0;
3880         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3881         cqr->expires = 10 * HZ;
3882
3883         /* Prepare for Read Subsystem Data */
3884         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3885         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
3886         prssdp->order = PSF_ORDER_PRSSD;
3887         prssdp->suborder = 0x01;        /* Performance Statistics */
3888         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
3889
3890         ccw = cqr->cpaddr;
3891         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3892         ccw->count = sizeof(struct dasd_psf_prssd_data);
3893         ccw->flags |= CCW_FLAG_CC;
3894         ccw->cda = (__u32)(addr_t) prssdp;
3895
3896         /* Read Subsystem Data - Performance Statistics */
3897         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3898         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
3899
3900         ccw++;
3901         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3902         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
3903         ccw->cda = (__u32)(addr_t) stats;
3904
3905         cqr->buildclk = get_tod_clock();
3906         cqr->status = DASD_CQR_FILLED;
3907         rc = dasd_sleep_on(cqr);
3908         if (rc == 0) {
3909                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3910                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3911                 if (copy_to_user(argp, stats,
3912                                  sizeof(struct dasd_rssd_perf_stats_t)))
3913                         rc = -EFAULT;
3914         }
3915         dasd_sfree_request(cqr, cqr->memdev);
3916         return rc;
3917 }
3918
3919 /*
3920  * Get attributes (cache operations)
3921  * Returnes the cache attributes used in Define Extend (DE).
3922  */
3923 static int
3924 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
3925 {
3926         struct dasd_eckd_private *private =
3927                 (struct dasd_eckd_private *)device->private;
3928         struct attrib_data_t attrib = private->attrib;
3929         int rc;
3930
3931         if (!capable(CAP_SYS_ADMIN))
3932                 return -EACCES;
3933         if (!argp)
3934                 return -EINVAL;
3935
3936         rc = 0;
3937         if (copy_to_user(argp, (long *) &attrib,
3938                          sizeof(struct attrib_data_t)))
3939                 rc = -EFAULT;
3940
3941         return rc;
3942 }
3943
3944 /*
3945  * Set attributes (cache operations)
3946  * Stores the attributes for cache operation to be used in Define Extend (DE).
3947  */
3948 static int
3949 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
3950 {
3951         struct dasd_eckd_private *private =
3952                 (struct dasd_eckd_private *)device->private;
3953         struct attrib_data_t attrib;
3954
3955         if (!capable(CAP_SYS_ADMIN))
3956                 return -EACCES;
3957         if (!argp)
3958                 return -EINVAL;
3959
3960         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
3961                 return -EFAULT;
3962         private->attrib = attrib;
3963
3964         dev_info(&device->cdev->dev,
3965                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
3966                  private->attrib.operation, private->attrib.nr_cyl);
3967         return 0;
3968 }
3969
3970 /*
3971  * Issue syscall I/O to EMC Symmetrix array.
3972  * CCWs are PSF and RSSD
3973  */
3974 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
3975 {
3976         struct dasd_symmio_parms usrparm;
3977         char *psf_data, *rssd_result;
3978         struct dasd_ccw_req *cqr;
3979         struct ccw1 *ccw;
3980         char psf0, psf1;
3981         int rc;
3982
3983         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
3984                 return -EACCES;
3985         psf0 = psf1 = 0;
3986
3987         /* Copy parms from caller */
3988         rc = -EFAULT;
3989         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3990                 goto out;
3991         if (is_compat_task()) {
3992                 /* Make sure pointers are sane even on 31 bit. */
3993                 rc = -EINVAL;
3994                 if ((usrparm.psf_data >> 32) != 0)
3995                         goto out;
3996                 if ((usrparm.rssd_result >> 32) != 0)
3997                         goto out;
3998                 usrparm.psf_data &= 0x7fffffffULL;
3999                 usrparm.rssd_result &= 0x7fffffffULL;
4000         }
4001         /* alloc I/O data area */
4002         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
4003         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
4004         if (!psf_data || !rssd_result) {
4005                 rc = -ENOMEM;
4006                 goto out_free;
4007         }
4008
4009         /* get syscall header from user space */
4010         rc = -EFAULT;
4011         if (copy_from_user(psf_data,
4012                            (void __user *)(unsigned long) usrparm.psf_data,
4013                            usrparm.psf_data_len))
4014                 goto out_free;
4015         psf0 = psf_data[0];
4016         psf1 = psf_data[1];
4017
4018         /* setup CCWs for PSF + RSSD */
4019         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
4020         if (IS_ERR(cqr)) {
4021                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4022                         "Could not allocate initialization request");
4023                 rc = PTR_ERR(cqr);
4024                 goto out_free;
4025         }
4026
4027         cqr->startdev = device;
4028         cqr->memdev = device;
4029         cqr->retries = 3;
4030         cqr->expires = 10 * HZ;
4031         cqr->buildclk = get_tod_clock();
4032         cqr->status = DASD_CQR_FILLED;
4033
4034         /* Build the ccws */
4035         ccw = cqr->cpaddr;
4036
4037         /* PSF ccw */
4038         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4039         ccw->count = usrparm.psf_data_len;
4040         ccw->flags |= CCW_FLAG_CC;
4041         ccw->cda = (__u32)(addr_t) psf_data;
4042
4043         ccw++;
4044
4045         /* RSSD ccw  */
4046         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4047         ccw->count = usrparm.rssd_result_len;
4048         ccw->flags = CCW_FLAG_SLI ;
4049         ccw->cda = (__u32)(addr_t) rssd_result;
4050
4051         rc = dasd_sleep_on(cqr);
4052         if (rc)
4053                 goto out_sfree;
4054
4055         rc = -EFAULT;
4056         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
4057                            rssd_result, usrparm.rssd_result_len))
4058                 goto out_sfree;
4059         rc = 0;
4060
4061 out_sfree:
4062         dasd_sfree_request(cqr, cqr->memdev);
4063 out_free:
4064         kfree(rssd_result);
4065         kfree(psf_data);
4066 out:
4067         DBF_DEV_EVENT(DBF_WARNING, device,
4068                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
4069                       (int) psf0, (int) psf1, rc);
4070         return rc;
4071 }
4072
4073 static int
4074 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
4075 {
4076         struct dasd_device *device = block->base;
4077
4078         switch (cmd) {
4079         case BIODASDGATTR:
4080                 return dasd_eckd_get_attrib(device, argp);
4081         case BIODASDSATTR:
4082                 return dasd_eckd_set_attrib(device, argp);
4083         case BIODASDPSRD:
4084                 return dasd_eckd_performance(device, argp);
4085         case BIODASDRLSE:
4086                 return dasd_eckd_release(device);
4087         case BIODASDRSRV:
4088                 return dasd_eckd_reserve(device);
4089         case BIODASDSLCK:
4090                 return dasd_eckd_steal_lock(device);
4091         case BIODASDSNID:
4092                 return dasd_eckd_snid(device, argp);
4093         case BIODASDSYMMIO:
4094                 return dasd_symm_io(device, argp);
4095         default:
4096                 return -ENOTTY;
4097         }
4098 }
4099
4100 /*
4101  * Dump the range of CCWs into 'page' buffer
4102  * and return number of printed chars.
4103  */
4104 static int
4105 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
4106 {
4107         int len, count;
4108         char *datap;
4109
4110         len = 0;
4111         while (from <= to) {
4112                 len += sprintf(page + len, PRINTK_HEADER
4113                                " CCW %p: %08X %08X DAT:",
4114                                from, ((int *) from)[0], ((int *) from)[1]);
4115
4116                 /* get pointer to data (consider IDALs) */
4117                 if (from->flags & CCW_FLAG_IDA)
4118                         datap = (char *) *((addr_t *) (addr_t) from->cda);
4119                 else
4120                         datap = (char *) ((addr_t) from->cda);
4121
4122                 /* dump data (max 32 bytes) */
4123                 for (count = 0; count < from->count && count < 32; count++) {
4124                         if (count % 8 == 0) len += sprintf(page + len, " ");
4125                         if (count % 4 == 0) len += sprintf(page + len, " ");
4126                         len += sprintf(page + len, "%02x", datap[count]);
4127                 }
4128                 len += sprintf(page + len, "\n");
4129                 from++;
4130         }
4131         return len;
4132 }
4133
4134 static void
4135 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
4136                          char *reason)
4137 {
4138         u64 *sense;
4139         u64 *stat;
4140
4141         sense = (u64 *) dasd_get_sense(irb);
4142         stat = (u64 *) &irb->scsw;
4143         if (sense) {
4144                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
4145                               "%016llx %016llx %016llx %016llx",
4146                               reason, *stat, *((u32 *) (stat + 1)),
4147                               sense[0], sense[1], sense[2], sense[3]);
4148         } else {
4149                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
4150                               reason, *stat, *((u32 *) (stat + 1)),
4151                               "NO VALID SENSE");
4152         }
4153 }
4154
4155 /*
4156  * Print sense data and related channel program.
4157  * Parts are printed because printk buffer is only 1024 bytes.
4158  */
4159 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
4160                                  struct dasd_ccw_req *req, struct irb *irb)
4161 {
4162         char *page;
4163         struct ccw1 *first, *last, *fail, *from, *to;
4164         int len, sl, sct;
4165
4166         page = (char *) get_zeroed_page(GFP_ATOMIC);
4167         if (page == NULL) {
4168                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4169                               "No memory to dump sense data\n");
4170                 return;
4171         }
4172         /* dump the sense data */
4173         len = sprintf(page, PRINTK_HEADER
4174                       " I/O status report for device %s:\n",
4175                       dev_name(&device->cdev->dev));
4176         len += sprintf(page + len, PRINTK_HEADER
4177                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4178                        "CS:%02X RC:%d\n",
4179                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4180                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4181                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4182                        req ? req->intrc : 0);
4183         len += sprintf(page + len, PRINTK_HEADER
4184                        " device %s: Failing CCW: %p\n",
4185                        dev_name(&device->cdev->dev),
4186                        (void *) (addr_t) irb->scsw.cmd.cpa);
4187         if (irb->esw.esw0.erw.cons) {
4188                 for (sl = 0; sl < 4; sl++) {
4189                         len += sprintf(page + len, PRINTK_HEADER
4190                                        " Sense(hex) %2d-%2d:",
4191                                        (8 * sl), ((8 * sl) + 7));
4192
4193                         for (sct = 0; sct < 8; sct++) {
4194                                 len += sprintf(page + len, " %02x",
4195                                                irb->ecw[8 * sl + sct]);
4196                         }
4197                         len += sprintf(page + len, "\n");
4198                 }
4199
4200                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
4201                         /* 24 Byte Sense Data */
4202                         sprintf(page + len, PRINTK_HEADER
4203                                 " 24 Byte: %x MSG %x, "
4204                                 "%s MSGb to SYSOP\n",
4205                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
4206                                 irb->ecw[1] & 0x10 ? "" : "no");
4207                 } else {
4208                         /* 32 Byte Sense Data */
4209                         sprintf(page + len, PRINTK_HEADER
4210                                 " 32 Byte: Format: %x "
4211                                 "Exception class %x\n",
4212                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
4213                 }
4214         } else {
4215                 sprintf(page + len, PRINTK_HEADER
4216                         " SORRY - NO VALID SENSE AVAILABLE\n");
4217         }
4218         printk(KERN_ERR "%s", page);
4219
4220         if (req) {
4221                 /* req == NULL for unsolicited interrupts */
4222                 /* dump the Channel Program (max 140 Bytes per line) */
4223                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
4224                 first = req->cpaddr;
4225                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
4226                 to = min(first + 6, last);
4227                 len = sprintf(page, PRINTK_HEADER
4228                               " Related CP in req: %p\n", req);
4229                 dasd_eckd_dump_ccw_range(first, to, page + len);
4230                 printk(KERN_ERR "%s", page);
4231
4232                 /* print failing CCW area (maximum 4) */
4233                 /* scsw->cda is either valid or zero  */
4234                 len = 0;
4235                 from = ++to;
4236                 fail = (struct ccw1 *)(addr_t)
4237                                 irb->scsw.cmd.cpa; /* failing CCW */
4238                 if (from <  fail - 2) {
4239                         from = fail - 2;     /* there is a gap - print header */
4240                         len += sprintf(page, PRINTK_HEADER "......\n");
4241                 }
4242                 to = min(fail + 1, last);
4243                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
4244
4245                 /* print last CCWs (maximum 2) */
4246                 from = max(from, ++to);
4247                 if (from < last - 1) {
4248                         from = last - 1;     /* there is a gap - print header */
4249                         len += sprintf(page + len, PRINTK_HEADER "......\n");
4250                 }
4251                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
4252                 if (len > 0)
4253                         printk(KERN_ERR "%s", page);
4254         }
4255         free_page((unsigned long) page);
4256 }
4257
4258
4259 /*
4260  * Print sense data from a tcw.
4261  */
4262 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4263                                  struct dasd_ccw_req *req, struct irb *irb)
4264 {
4265         char *page;
4266         int len, sl, sct, residual;
4267         struct tsb *tsb;
4268         u8 *sense, *rcq;
4269
4270         page = (char *) get_zeroed_page(GFP_ATOMIC);
4271         if (page == NULL) {
4272                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4273                             "No memory to dump sense data");
4274                 return;
4275         }
4276         /* dump the sense data */
4277         len = sprintf(page, PRINTK_HEADER
4278                       " I/O status report for device %s:\n",
4279                       dev_name(&device->cdev->dev));
4280         len += sprintf(page + len, PRINTK_HEADER
4281                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4282                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4283                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4284                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4285                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4286                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
4287                        req ? req->intrc : 0);
4288         len += sprintf(page + len, PRINTK_HEADER
4289                        " device %s: Failing TCW: %p\n",
4290                        dev_name(&device->cdev->dev),
4291                        (void *) (addr_t) irb->scsw.tm.tcw);
4292
4293         tsb = NULL;
4294         sense = NULL;
4295         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4296                 tsb = tcw_get_tsb(
4297                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4298
4299         if (tsb) {
4300                 len += sprintf(page + len, PRINTK_HEADER
4301                                " tsb->length %d\n", tsb->length);
4302                 len += sprintf(page + len, PRINTK_HEADER
4303                                " tsb->flags %x\n", tsb->flags);
4304                 len += sprintf(page + len, PRINTK_HEADER
4305                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
4306                 len += sprintf(page + len, PRINTK_HEADER
4307                                " tsb->count %d\n", tsb->count);
4308                 residual = tsb->count - 28;
4309                 len += sprintf(page + len, PRINTK_HEADER
4310                                " residual %d\n", residual);
4311
4312                 switch (tsb->flags & 0x07) {
4313                 case 1: /* tsa_iostat */
4314                         len += sprintf(page + len, PRINTK_HEADER
4315                                " tsb->tsa.iostat.dev_time %d\n",
4316                                        tsb->tsa.iostat.dev_time);
4317                         len += sprintf(page + len, PRINTK_HEADER
4318                                " tsb->tsa.iostat.def_time %d\n",
4319                                        tsb->tsa.iostat.def_time);
4320                         len += sprintf(page + len, PRINTK_HEADER
4321                                " tsb->tsa.iostat.queue_time %d\n",
4322                                        tsb->tsa.iostat.queue_time);
4323                         len += sprintf(page + len, PRINTK_HEADER
4324                                " tsb->tsa.iostat.dev_busy_time %d\n",
4325                                        tsb->tsa.iostat.dev_busy_time);
4326                         len += sprintf(page + len, PRINTK_HEADER
4327                                " tsb->tsa.iostat.dev_act_time %d\n",
4328                                        tsb->tsa.iostat.dev_act_time);
4329                         sense = tsb->tsa.iostat.sense;
4330                         break;
4331                 case 2: /* ts_ddpc */
4332                         len += sprintf(page + len, PRINTK_HEADER
4333                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4334                         for (sl = 0; sl < 2; sl++) {
4335                                 len += sprintf(page + len, PRINTK_HEADER
4336                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
4337                                                (8 * sl), ((8 * sl) + 7));
4338                                 rcq = tsb->tsa.ddpc.rcq;
4339                                 for (sct = 0; sct < 8; sct++) {
4340                                         len += sprintf(page + len, " %02x",
4341                                                        rcq[8 * sl + sct]);
4342                                 }
4343                                 len += sprintf(page + len, "\n");
4344                         }
4345                         sense = tsb->tsa.ddpc.sense;
4346                         break;
4347                 case 3: /* tsa_intrg */
4348                         len += sprintf(page + len, PRINTK_HEADER
4349                                       " tsb->tsa.intrg.: not supportet yet\n");
4350                         break;
4351                 }
4352
4353                 if (sense) {
4354                         for (sl = 0; sl < 4; sl++) {
4355                                 len += sprintf(page + len, PRINTK_HEADER
4356                                                " Sense(hex) %2d-%2d:",
4357                                                (8 * sl), ((8 * sl) + 7));
4358                                 for (sct = 0; sct < 8; sct++) {
4359                                         len += sprintf(page + len, " %02x",
4360                                                        sense[8 * sl + sct]);
4361                                 }
4362                                 len += sprintf(page + len, "\n");
4363                         }
4364
4365                         if (sense[27] & DASD_SENSE_BIT_0) {
4366                                 /* 24 Byte Sense Data */
4367                                 sprintf(page + len, PRINTK_HEADER
4368                                         " 24 Byte: %x MSG %x, "
4369                                         "%s MSGb to SYSOP\n",
4370                                         sense[7] >> 4, sense[7] & 0x0f,
4371                                         sense[1] & 0x10 ? "" : "no");
4372                         } else {
4373                                 /* 32 Byte Sense Data */
4374                                 sprintf(page + len, PRINTK_HEADER
4375                                         " 32 Byte: Format: %x "
4376                                         "Exception class %x\n",
4377                                         sense[6] & 0x0f, sense[22] >> 4);
4378                         }
4379                 } else {
4380                         sprintf(page + len, PRINTK_HEADER
4381                                 " SORRY - NO VALID SENSE AVAILABLE\n");
4382                 }
4383         } else {
4384                 sprintf(page + len, PRINTK_HEADER
4385                         " SORRY - NO TSB DATA AVAILABLE\n");
4386         }
4387         printk(KERN_ERR "%s", page);
4388         free_page((unsigned long) page);
4389 }
4390
4391 static void dasd_eckd_dump_sense(struct dasd_device *device,
4392                                  struct dasd_ccw_req *req, struct irb *irb)
4393 {
4394         if (scsw_is_tm(&irb->scsw))
4395                 dasd_eckd_dump_sense_tcw(device, req, irb);
4396         else
4397                 dasd_eckd_dump_sense_ccw(device, req, irb);
4398 }
4399
4400 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4401 {
4402         /*
4403          * the device should be disconnected from our LCU structure
4404          * on restore we will reconnect it and reread LCU specific
4405          * information like PAV support that might have changed
4406          */
4407         dasd_alias_remove_device(device);
4408         dasd_alias_disconnect_device_from_lcu(device);
4409
4410         return 0;
4411 }
4412
4413 static int dasd_eckd_restore_device(struct dasd_device *device)
4414 {
4415         struct dasd_eckd_private *private;
4416         struct dasd_eckd_characteristics temp_rdc_data;
4417         int rc;
4418         struct dasd_uid temp_uid;
4419         unsigned long flags;
4420         unsigned long cqr_flags = 0;
4421
4422         private = (struct dasd_eckd_private *) device->private;
4423
4424         /* Read Configuration Data */
4425         dasd_eckd_read_conf(device);
4426
4427         dasd_eckd_get_uid(device, &temp_uid);
4428         /* Generate device unique id */
4429         rc = dasd_eckd_generate_uid(device);
4430         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4431         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4432                 dev_err(&device->cdev->dev, "The UID of the DASD has "
4433                         "changed\n");
4434         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4435         if (rc)
4436                 goto out_err;
4437
4438         /* register lcu with alias handling, enable PAV if this is a new lcu */
4439         rc = dasd_alias_make_device_known_to_lcu(device);
4440         if (rc)
4441                 return rc;
4442
4443         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
4444         dasd_eckd_validate_server(device, cqr_flags);
4445
4446         /* RE-Read Configuration Data */
4447         dasd_eckd_read_conf(device);
4448
4449         /* Read Feature Codes */
4450         dasd_eckd_read_features(device);
4451
4452         /* Read Device Characteristics */
4453         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4454                                          &temp_rdc_data, 64);
4455         if (rc) {
4456                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4457                                 "Read device characteristic failed, rc=%d", rc);
4458                 goto out_err;
4459         }
4460         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4461         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4462         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4463
4464         /* add device to alias management */
4465         dasd_alias_add_device(device);
4466
4467         return 0;
4468
4469 out_err:
4470         return -1;
4471 }
4472
4473 static int dasd_eckd_reload_device(struct dasd_device *device)
4474 {
4475         struct dasd_eckd_private *private;
4476         int rc, old_base;
4477         char print_uid[60];
4478         struct dasd_uid uid;
4479         unsigned long flags;
4480
4481         private = (struct dasd_eckd_private *) device->private;
4482
4483         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4484         old_base = private->uid.base_unit_addr;
4485         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4486
4487         /* Read Configuration Data */
4488         rc = dasd_eckd_read_conf(device);
4489         if (rc)
4490                 goto out_err;
4491
4492         rc = dasd_eckd_generate_uid(device);
4493         if (rc)
4494                 goto out_err;
4495         /*
4496          * update unit address configuration and
4497          * add device to alias management
4498          */
4499         dasd_alias_update_add_device(device);
4500
4501         dasd_eckd_get_uid(device, &uid);
4502
4503         if (old_base != uid.base_unit_addr) {
4504                 if (strlen(uid.vduit) > 0)
4505                         snprintf(print_uid, sizeof(print_uid),
4506                                  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
4507                                  uid.ssid, uid.base_unit_addr, uid.vduit);
4508                 else
4509                         snprintf(print_uid, sizeof(print_uid),
4510                                  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
4511                                  uid.ssid, uid.base_unit_addr);
4512
4513                 dev_info(&device->cdev->dev,
4514                          "An Alias device was reassigned to a new base device "
4515                          "with UID: %s\n", print_uid);
4516         }
4517         return 0;
4518
4519 out_err:
4520         return -1;
4521 }
4522
4523 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
4524                                          struct dasd_rssd_messages *messages,
4525                                          __u8 lpum)
4526 {
4527         struct dasd_rssd_messages *message_buf;
4528         struct dasd_psf_prssd_data *prssdp;
4529         struct dasd_eckd_private *private;
4530         struct dasd_ccw_req *cqr;
4531         struct ccw1 *ccw;
4532         int rc;
4533
4534         private = (struct dasd_eckd_private *) device->private;
4535         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
4536                                    (sizeof(struct dasd_psf_prssd_data) +
4537                                     sizeof(struct dasd_rssd_messages)),
4538                                    device);
4539         if (IS_ERR(cqr)) {
4540                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
4541                                 "Could not allocate read message buffer request");
4542                 return PTR_ERR(cqr);
4543         }
4544
4545         cqr->startdev = device;
4546         cqr->memdev = device;
4547         cqr->block = NULL;
4548         cqr->expires = 10 * HZ;
4549         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
4550         /* dasd_sleep_on_immediatly does not do complex error
4551          * recovery so clear erp flag and set retry counter to
4552          * do basic erp */
4553         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4554         cqr->retries = 256;
4555
4556         /* Prepare for Read Subsystem Data */
4557         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4558         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
4559         prssdp->order = PSF_ORDER_PRSSD;
4560         prssdp->suborder = 0x03;        /* Message Buffer */
4561         /* all other bytes of prssdp must be zero */
4562
4563         ccw = cqr->cpaddr;
4564         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4565         ccw->count = sizeof(struct dasd_psf_prssd_data);
4566         ccw->flags |= CCW_FLAG_CC;
4567         ccw->flags |= CCW_FLAG_SLI;
4568         ccw->cda = (__u32)(addr_t) prssdp;
4569
4570         /* Read Subsystem Data - message buffer */
4571         message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
4572         memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
4573
4574         ccw++;
4575         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4576         ccw->count = sizeof(struct dasd_rssd_messages);
4577         ccw->flags |= CCW_FLAG_SLI;
4578         ccw->cda = (__u32)(addr_t) message_buf;
4579
4580         cqr->buildclk = get_tod_clock();
4581         cqr->status = DASD_CQR_FILLED;
4582         rc = dasd_sleep_on_immediatly(cqr);
4583         if (rc == 0) {
4584                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4585                 message_buf = (struct dasd_rssd_messages *)
4586                         (prssdp + 1);
4587                 memcpy(messages, message_buf,
4588                        sizeof(struct dasd_rssd_messages));
4589         } else
4590                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4591                                 "Reading messages failed with rc=%d\n"
4592                                 , rc);
4593         dasd_sfree_request(cqr, cqr->memdev);
4594         return rc;
4595 }
4596
4597 /*
4598  * Perform Subsystem Function - CUIR response
4599  */
4600 static int
4601 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
4602                             __u32 message_id,
4603                             struct channel_path_desc *desc,
4604                             struct subchannel_id sch_id)
4605 {
4606         struct dasd_psf_cuir_response *psf_cuir;
4607         struct dasd_ccw_req *cqr;
4608         struct ccw1 *ccw;
4609         int rc;
4610
4611         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
4612                                   sizeof(struct dasd_psf_cuir_response),
4613                                   device);
4614
4615         if (IS_ERR(cqr)) {
4616                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4617                            "Could not allocate PSF-CUIR request");
4618                 return PTR_ERR(cqr);
4619         }
4620
4621         psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
4622         psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
4623         psf_cuir->cc = response;
4624         if (desc)
4625                 psf_cuir->chpid = desc->chpid;
4626         psf_cuir->message_id = message_id;
4627         psf_cuir->cssid = sch_id.cssid;
4628         psf_cuir->ssid = sch_id.ssid;
4629         ccw = cqr->cpaddr;
4630         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4631         ccw->cda = (__u32)(addr_t)psf_cuir;
4632         ccw->flags = CCW_FLAG_SLI;
4633         ccw->count = sizeof(struct dasd_psf_cuir_response);
4634
4635         cqr->startdev = device;
4636         cqr->memdev = device;
4637         cqr->block = NULL;
4638         cqr->retries = 256;
4639         cqr->expires = 10*HZ;
4640         cqr->buildclk = get_tod_clock();
4641         cqr->status = DASD_CQR_FILLED;
4642         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
4643
4644         rc = dasd_sleep_on(cqr);
4645
4646         dasd_sfree_request(cqr, cqr->memdev);
4647         return rc;
4648 }
4649
4650 /*
4651  * return configuration data that is referenced by record selector
4652  * if a record selector is specified or per default return the
4653  * conf_data pointer for the path specified by lpum
4654  */
4655 static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
4656                                                      __u8 lpum,
4657                                                      struct dasd_cuir_message *cuir)
4658 {
4659         struct dasd_eckd_private *private;
4660         struct dasd_conf_data *conf_data;
4661         int path, pos;
4662
4663         private = (struct dasd_eckd_private *) device->private;
4664         if (cuir->record_selector == 0)
4665                 goto out;
4666         for (path = 0x80, pos = 0; path; path >>= 1, pos++) {
4667                 conf_data = private->path_conf_data[pos];
4668                 if (conf_data->gneq.record_selector ==
4669                     cuir->record_selector)
4670                         return conf_data;
4671         }
4672 out:
4673         return private->path_conf_data[pathmask_to_pos(lpum)];
4674 }
4675
4676 /*
4677  * This function determines the scope of a reconfiguration request by
4678  * analysing the path and device selection data provided in the CUIR request.
4679  * Returns a path mask containing CUIR affected paths for the give device.
4680  *
4681  * If the CUIR request does not contain the required information return the
4682  * path mask of the path the attention message for the CUIR request was reveived
4683  * on.
4684  */
4685 static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
4686                                 struct dasd_cuir_message *cuir)
4687 {
4688         struct dasd_conf_data *ref_conf_data;
4689         unsigned long bitmask = 0, mask = 0;
4690         struct dasd_eckd_private *private;
4691         struct dasd_conf_data *conf_data;
4692         unsigned int pos, path;
4693         char *ref_gneq, *gneq;
4694         char *ref_ned, *ned;
4695         int tbcpm = 0;
4696
4697         /* if CUIR request does not specify the scope use the path
4698            the attention message was presented on */
4699         if (!cuir->ned_map ||
4700             !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2]))
4701                 return lpum;
4702
4703         private = (struct dasd_eckd_private *) device->private;
4704         /* get reference conf data */
4705         ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir);
4706         /* reference ned is determined by ned_map field */
4707         pos = 8 - ffs(cuir->ned_map);
4708         ref_ned = (char *)&ref_conf_data->neds[pos];
4709         ref_gneq = (char *)&ref_conf_data->gneq;
4710         /* transfer 24 bit neq_map to mask */
4711         mask = cuir->neq_map[2];
4712         mask |= cuir->neq_map[1] << 8;
4713         mask |= cuir->neq_map[0] << 16;
4714
4715         for (path = 0x80; path; path >>= 1) {
4716                 /* initialise data per path */
4717                 bitmask = mask;
4718                 pos = pathmask_to_pos(path);
4719                 conf_data = private->path_conf_data[pos];
4720                 pos = 8 - ffs(cuir->ned_map);
4721                 ned = (char *) &conf_data->neds[pos];
4722                 /* compare reference ned and per path ned */
4723                 if (memcmp(ref_ned, ned, sizeof(*ned)) != 0)
4724                         continue;
4725                 gneq = (char *)&conf_data->gneq;
4726                 /* compare reference gneq and per_path gneq under
4727                    24 bit mask where mask bit 0 equals byte 7 of
4728                    the gneq and mask bit 24 equals byte 31 */
4729                 while (bitmask) {
4730                         pos = ffs(bitmask) - 1;
4731                         if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1)
4732                             != 0)
4733                                 break;
4734                         clear_bit(pos, &bitmask);
4735                 }
4736                 if (bitmask)
4737                         continue;
4738                 /* device and path match the reference values
4739                    add path to CUIR scope */
4740                 tbcpm |= path;
4741         }
4742         return tbcpm;
4743 }
4744
4745 static void dasd_eckd_cuir_notify_user(struct dasd_device *device,
4746                                        unsigned long paths,
4747                                        struct subchannel_id sch_id, int action)
4748 {
4749         struct channel_path_desc *desc;
4750         int pos;
4751
4752         while (paths) {
4753                 /* get position of bit in mask */
4754                 pos = ffs(paths) - 1;
4755                 /* get channel path descriptor from this position */
4756                 desc = ccw_device_get_chp_desc(device->cdev, 7 - pos);
4757                 if (action == CUIR_QUIESCE)
4758                         pr_warn("Service on the storage server caused path "
4759                                 "%x.%02x to go offline", sch_id.cssid,
4760                                 desc ? desc->chpid : 0);
4761                 else if (action == CUIR_RESUME)
4762                         pr_info("Path %x.%02x is back online after service "
4763                                 "on the storage server", sch_id.cssid,
4764                                 desc ? desc->chpid : 0);
4765                 kfree(desc);
4766                 clear_bit(pos, &paths);
4767         }
4768 }
4769
4770 static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum,
4771                                       struct dasd_cuir_message *cuir)
4772 {
4773         unsigned long tbcpm;
4774
4775         tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir);
4776         /* nothing to do if path is not in use */
4777         if (!(device->path_data.opm & tbcpm))
4778                 return 0;
4779         if (!(device->path_data.opm & ~tbcpm)) {
4780                 /* no path would be left if the CUIR action is taken
4781                    return error */
4782                 return -EINVAL;
4783         }
4784         /* remove device from operational path mask */
4785         device->path_data.opm &= ~tbcpm;
4786         device->path_data.cuirpm |= tbcpm;
4787         return tbcpm;
4788 }
4789
4790 /*
4791  * walk through all devices and build a path mask to quiesce them
4792  * return an error if the last path to a device would be removed
4793  *
4794  * if only part of the devices are quiesced and an error
4795  * occurs no onlining necessary, the storage server will
4796  * notify the already set offline devices again
4797  */
4798 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
4799                                   struct subchannel_id sch_id,
4800                                   struct dasd_cuir_message *cuir)
4801 {
4802         struct alias_pav_group *pavgroup, *tempgroup;
4803         struct dasd_eckd_private *private;
4804         struct dasd_device *dev, *n;
4805         unsigned long paths = 0;
4806         unsigned long flags;
4807         int tbcpm;
4808
4809         private = (struct dasd_eckd_private *) device->private;
4810         /* active devices */
4811         list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
4812                                  alias_list) {
4813                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
4814                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
4815                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
4816                 if (tbcpm < 0)
4817                         goto out_err;
4818                 paths |= tbcpm;
4819         }
4820         /* inactive devices */
4821         list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
4822                                  alias_list) {
4823                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
4824                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
4825                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
4826                 if (tbcpm < 0)
4827                         goto out_err;
4828                 paths |= tbcpm;
4829         }
4830         /* devices in PAV groups */
4831         list_for_each_entry_safe(pavgroup, tempgroup,
4832                                  &private->lcu->grouplist, group) {
4833                 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
4834                                          alias_list) {
4835                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
4836                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
4837                         spin_unlock_irqrestore(
4838                                 get_ccwdev_lock(dev->cdev), flags);
4839                         if (tbcpm < 0)
4840                                 goto out_err;
4841                         paths |= tbcpm;
4842                 }
4843                 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
4844                                          alias_list) {
4845                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
4846                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
4847                         spin_unlock_irqrestore(
4848                                 get_ccwdev_lock(dev->cdev), flags);
4849                         if (tbcpm < 0)
4850                                 goto out_err;
4851                         paths |= tbcpm;
4852                 }
4853         }
4854         /* notify user about all paths affected by CUIR action */
4855         dasd_eckd_cuir_notify_user(device, paths, sch_id, CUIR_QUIESCE);
4856         return 0;
4857 out_err:
4858         return tbcpm;
4859 }
4860
4861 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
4862                                  struct subchannel_id sch_id,
4863                                  struct dasd_cuir_message *cuir)
4864 {
4865         struct alias_pav_group *pavgroup, *tempgroup;
4866         struct dasd_eckd_private *private;
4867         struct dasd_device *dev, *n;
4868         unsigned long paths = 0;
4869         int tbcpm;
4870
4871         private = (struct dasd_eckd_private *) device->private;
4872         /*
4873          * the path may have been added through a generic path event before
4874          * only trigger path verification if the path is not already in use
4875          */
4876         list_for_each_entry_safe(dev, n,
4877                                  &private->lcu->active_devices,
4878                                  alias_list) {
4879                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
4880                 paths |= tbcpm;
4881                 if (!(dev->path_data.opm & tbcpm)) {
4882                         dev->path_data.tbvpm |= tbcpm;
4883                         dasd_schedule_device_bh(dev);
4884                 }
4885         }
4886         list_for_each_entry_safe(dev, n,
4887                                  &private->lcu->inactive_devices,
4888                                  alias_list) {
4889                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
4890                 paths |= tbcpm;
4891                 if (!(dev->path_data.opm & tbcpm)) {
4892                         dev->path_data.tbvpm |= tbcpm;
4893                         dasd_schedule_device_bh(dev);
4894                 }
4895         }
4896         /* devices in PAV groups */
4897         list_for_each_entry_safe(pavgroup, tempgroup,
4898                                  &private->lcu->grouplist,
4899                                  group) {
4900                 list_for_each_entry_safe(dev, n,
4901                                          &pavgroup->baselist,
4902                                          alias_list) {
4903                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
4904                         paths |= tbcpm;
4905                         if (!(dev->path_data.opm & tbcpm)) {
4906                                 dev->path_data.tbvpm |= tbcpm;
4907                                 dasd_schedule_device_bh(dev);
4908                         }
4909                 }
4910                 list_for_each_entry_safe(dev, n,
4911                                          &pavgroup->aliaslist,
4912                                          alias_list) {
4913                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
4914                         paths |= tbcpm;
4915                         if (!(dev->path_data.opm & tbcpm)) {
4916                                 dev->path_data.tbvpm |= tbcpm;
4917                                 dasd_schedule_device_bh(dev);
4918                         }
4919                 }
4920         }
4921         /* notify user about all paths affected by CUIR action */
4922         dasd_eckd_cuir_notify_user(device, paths, sch_id, CUIR_RESUME);
4923         return 0;
4924 }
4925
4926 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
4927                                  __u8 lpum)
4928 {
4929         struct dasd_cuir_message *cuir = messages;
4930         struct channel_path_desc *desc;
4931         struct subchannel_id sch_id;
4932         int pos, response;
4933
4934         DBF_DEV_EVENT(DBF_WARNING, device,
4935                       "CUIR request: %016llx %016llx %016llx %08x",
4936                       ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
4937                       ((u32 *)cuir)[3]);
4938         ccw_device_get_schid(device->cdev, &sch_id);
4939         pos = pathmask_to_pos(lpum);
4940         desc = ccw_device_get_chp_desc(device->cdev, pos);
4941
4942         if (cuir->code == CUIR_QUIESCE) {
4943                 /* quiesce */
4944                 if (dasd_eckd_cuir_quiesce(device, lpum, sch_id, cuir))
4945                         response = PSF_CUIR_LAST_PATH;
4946                 else
4947                         response = PSF_CUIR_COMPLETED;
4948         } else if (cuir->code == CUIR_RESUME) {
4949                 /* resume */
4950                 dasd_eckd_cuir_resume(device, lpum, sch_id, cuir);
4951                 response = PSF_CUIR_COMPLETED;
4952         } else
4953                 response = PSF_CUIR_NOT_SUPPORTED;
4954
4955         dasd_eckd_psf_cuir_response(device, response,
4956                                     cuir->message_id, desc, sch_id);
4957         DBF_DEV_EVENT(DBF_WARNING, device,
4958                       "CUIR response: %d on message ID %08x", response,
4959                       cuir->message_id);
4960         /* free descriptor copy */
4961         kfree(desc);
4962         /* to make sure there is no attention left schedule work again */
4963         device->discipline->check_attention(device, lpum);
4964 }
4965
4966 static void dasd_eckd_check_attention_work(struct work_struct *work)
4967 {
4968         struct check_attention_work_data *data;
4969         struct dasd_rssd_messages *messages;
4970         struct dasd_device *device;
4971         int rc;
4972
4973         data = container_of(work, struct check_attention_work_data, worker);
4974         device = data->device;
4975         messages = kzalloc(sizeof(*messages), GFP_KERNEL);
4976         if (!messages) {
4977                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4978                               "Could not allocate attention message buffer");
4979                 goto out;
4980         }
4981         rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
4982         if (rc)
4983                 goto out;
4984         if (messages->length == ATTENTION_LENGTH_CUIR &&
4985             messages->format == ATTENTION_FORMAT_CUIR)
4986                 dasd_eckd_handle_cuir(device, messages, data->lpum);
4987 out:
4988         dasd_put_device(device);
4989         kfree(messages);
4990         kfree(data);
4991 }
4992
4993 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
4994 {
4995         struct check_attention_work_data *data;
4996
4997         data = kzalloc(sizeof(*data), GFP_ATOMIC);
4998         if (!data)
4999                 return -ENOMEM;
5000         INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
5001         dasd_get_device(device);
5002         data->device = device;
5003         data->lpum = lpum;
5004         schedule_work(&data->worker);
5005         return 0;
5006 }
5007
5008 static struct ccw_driver dasd_eckd_driver = {
5009         .driver = {
5010                 .name   = "dasd-eckd",
5011                 .owner  = THIS_MODULE,
5012         },
5013         .ids         = dasd_eckd_ids,
5014         .probe       = dasd_eckd_probe,
5015         .remove      = dasd_generic_remove,
5016         .set_offline = dasd_generic_set_offline,
5017         .set_online  = dasd_eckd_set_online,
5018         .notify      = dasd_generic_notify,
5019         .path_event  = dasd_generic_path_event,
5020         .shutdown    = dasd_generic_shutdown,
5021         .freeze      = dasd_generic_pm_freeze,
5022         .thaw        = dasd_generic_restore_device,
5023         .restore     = dasd_generic_restore_device,
5024         .uc_handler  = dasd_generic_uc_handler,
5025         .int_class   = IRQIO_DAS,
5026 };
5027
5028 /*
5029  * max_blocks is dependent on the amount of storage that is available
5030  * in the static io buffer for each device. Currently each device has
5031  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
5032  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
5033  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
5034  * addition we have one define extent ccw + 16 bytes of data and one
5035  * locate record ccw + 16 bytes of data. That makes:
5036  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
5037  * We want to fit two into the available memory so that we can immediately
5038  * start the next request if one finishes off. That makes 249.5 blocks
5039  * for one request. Give a little safety and the result is 240.
5040  */
5041 static struct dasd_discipline dasd_eckd_discipline = {
5042         .owner = THIS_MODULE,
5043         .name = "ECKD",
5044         .ebcname = "ECKD",
5045         .max_blocks = 190,
5046         .check_device = dasd_eckd_check_characteristics,
5047         .uncheck_device = dasd_eckd_uncheck_device,
5048         .do_analysis = dasd_eckd_do_analysis,
5049         .verify_path = dasd_eckd_verify_path,
5050         .basic_to_ready = dasd_eckd_basic_to_ready,
5051         .online_to_ready = dasd_eckd_online_to_ready,
5052         .basic_to_known = dasd_eckd_basic_to_known,
5053         .fill_geometry = dasd_eckd_fill_geometry,
5054         .start_IO = dasd_start_IO,
5055         .term_IO = dasd_term_IO,
5056         .handle_terminated_request = dasd_eckd_handle_terminated_request,
5057         .format_device = dasd_eckd_format_device,
5058         .erp_action = dasd_eckd_erp_action,
5059         .erp_postaction = dasd_eckd_erp_postaction,
5060         .check_for_device_change = dasd_eckd_check_for_device_change,
5061         .build_cp = dasd_eckd_build_alias_cp,
5062         .free_cp = dasd_eckd_free_alias_cp,
5063         .dump_sense = dasd_eckd_dump_sense,
5064         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
5065         .fill_info = dasd_eckd_fill_info,
5066         .ioctl = dasd_eckd_ioctl,
5067         .freeze = dasd_eckd_pm_freeze,
5068         .restore = dasd_eckd_restore_device,
5069         .reload = dasd_eckd_reload_device,
5070         .get_uid = dasd_eckd_get_uid,
5071         .kick_validate = dasd_eckd_kick_validate_server,
5072         .check_attention = dasd_eckd_check_attention,
5073 };
5074
5075 static int __init
5076 dasd_eckd_init(void)
5077 {
5078         int ret;
5079
5080         ASCEBC(dasd_eckd_discipline.ebcname, 4);
5081         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
5082                                    GFP_KERNEL | GFP_DMA);
5083         if (!dasd_reserve_req)
5084                 return -ENOMEM;
5085         path_verification_worker = kmalloc(sizeof(*path_verification_worker),
5086                                    GFP_KERNEL | GFP_DMA);
5087         if (!path_verification_worker) {
5088                 kfree(dasd_reserve_req);
5089                 return -ENOMEM;
5090         }
5091         rawpadpage = (void *)__get_free_page(GFP_KERNEL);
5092         if (!rawpadpage) {
5093                 kfree(path_verification_worker);
5094                 kfree(dasd_reserve_req);
5095                 return -ENOMEM;
5096         }
5097         ret = ccw_driver_register(&dasd_eckd_driver);
5098         if (!ret)
5099                 wait_for_device_probe();
5100         else {
5101                 kfree(path_verification_worker);
5102                 kfree(dasd_reserve_req);
5103                 free_page((unsigned long)rawpadpage);
5104         }
5105         return ret;
5106 }
5107
5108 static void __exit
5109 dasd_eckd_cleanup(void)
5110 {
5111         ccw_driver_unregister(&dasd_eckd_driver);
5112         kfree(path_verification_worker);
5113         kfree(dasd_reserve_req);
5114         free_page((unsigned long)rawpadpage);
5115 }
5116
5117 module_init(dasd_eckd_init);
5118 module_exit(dasd_eckd_cleanup);